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 #include "cds/cdsConfig.hpp"
  25 #include "classfile/classFileParser.hpp"
  26 #include "classfile/classFileStream.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.inline.hpp"
  29 #include "classfile/classLoadInfo.hpp"
  30 #include "classfile/defaultMethods.hpp"
  31 #include "classfile/fieldLayoutBuilder.hpp"
  32 #include "classfile/javaClasses.inline.hpp"
  33 #include "classfile/moduleEntry.hpp"
  34 #include "classfile/packageEntry.hpp"
  35 #include "classfile/symbolTable.hpp"
  36 #include "classfile/systemDictionary.hpp"
  37 #include "classfile/verificationType.hpp"
  38 #include "classfile/verifier.hpp"
  39 #include "classfile/vmClasses.hpp"
  40 #include "classfile/vmSymbols.hpp"
  41 #include "jvm.h"
  42 #include "logging/log.hpp"
  43 #include "logging/logStream.hpp"
  44 #include "memory/allocation.hpp"
  45 #include "memory/metadataFactory.hpp"
  46 #include "memory/oopFactory.hpp"
  47 #include "memory/resourceArea.hpp"
  48 #include "memory/universe.hpp"
  49 #include "oops/annotations.hpp"
  50 #include "oops/constantPool.inline.hpp"
  51 #include "oops/fieldInfo.hpp"
  52 #include "oops/fieldStreams.inline.hpp"
  53 #include "oops/instanceKlass.inline.hpp"
  54 #include "oops/instanceMirrorKlass.hpp"
  55 #include "oops/klass.inline.hpp"
  56 #include "oops/klassVtable.hpp"
  57 #include "oops/metadata.hpp"
  58 #include "oops/method.inline.hpp"
  59 #include "oops/oop.inline.hpp"
  60 #include "oops/recordComponent.hpp"
  61 #include "oops/symbol.hpp"
  62 #include "prims/jvmtiExport.hpp"
  63 #include "prims/jvmtiThreadState.hpp"
  64 #include "runtime/arguments.hpp"
  65 #include "runtime/fieldDescriptor.inline.hpp"
  66 #include "runtime/handles.inline.hpp"
  67 #include "runtime/javaCalls.hpp"
  68 #include "runtime/os.hpp"
  69 #include "runtime/perfData.hpp"
  70 #include "runtime/reflection.hpp"
  71 #include "runtime/safepointVerifiers.hpp"
  72 #include "runtime/signature.hpp"
  73 #include "runtime/timer.hpp"
  74 #include "services/classLoadingService.hpp"
  75 #include "services/threadService.hpp"
  76 #include "utilities/align.hpp"
  77 #include "utilities/bitMap.inline.hpp"
  78 #include "utilities/checkedCast.hpp"
  79 #include "utilities/copy.hpp"
  80 #include "utilities/formatBuffer.hpp"
  81 #include "utilities/exceptions.hpp"
  82 #include "utilities/globalDefinitions.hpp"
  83 #include "utilities/growableArray.hpp"
  84 #include "utilities/macros.hpp"
  85 #include "utilities/ostream.hpp"
  86 #include "utilities/resourceHash.hpp"
  87 #include "utilities/utf8.hpp"
  88 #if INCLUDE_CDS
  89 #include "classfile/systemDictionaryShared.hpp"
  90 #endif
  91 #if INCLUDE_JFR
  92 #include "jfr/support/jfrTraceIdExtension.hpp"
  93 #endif
  94 
  95 // We generally try to create the oops directly when parsing, rather than
  96 // allocating temporary data structures and copying the bytes twice. A
  97 // temporary area is only needed when parsing utf8 entries in the constant
  98 // pool and when parsing line number tables.
  99 
 100 // We add assert in debug mode when class format is not checked.
 101 
 102 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
 103 #define JAVA_MIN_SUPPORTED_VERSION        45
 104 #define JAVA_PREVIEW_MINOR_VERSION        65535
 105 
 106 // Used for two backward compatibility reasons:
 107 // - to check for new additions to the class file format in JDK1.5
 108 // - to check for bug fixes in the format checker in JDK1.5
 109 #define JAVA_1_5_VERSION                  49
 110 
 111 // Used for backward compatibility reasons:
 112 // - to check for javac bug fixes that happened after 1.5
 113 // - also used as the max version when running in jdk6
 114 #define JAVA_6_VERSION                    50
 115 
 116 // Used for backward compatibility reasons:
 117 // - to disallow argument and require ACC_STATIC for <clinit> methods
 118 #define JAVA_7_VERSION                    51
 119 
 120 // Extension method support.
 121 #define JAVA_8_VERSION                    52
 122 
 123 #define JAVA_9_VERSION                    53
 124 
 125 #define JAVA_10_VERSION                   54
 126 
 127 #define JAVA_11_VERSION                   55
 128 
 129 #define JAVA_12_VERSION                   56
 130 
 131 #define JAVA_13_VERSION                   57
 132 
 133 #define JAVA_14_VERSION                   58
 134 
 135 #define JAVA_15_VERSION                   59
 136 
 137 #define JAVA_16_VERSION                   60
 138 
 139 #define JAVA_17_VERSION                   61
 140 
 141 #define JAVA_18_VERSION                   62
 142 
 143 #define JAVA_19_VERSION                   63
 144 
 145 #define JAVA_20_VERSION                   64
 146 
 147 #define JAVA_21_VERSION                   65
 148 
 149 #define JAVA_22_VERSION                   66
 150 
 151 #define JAVA_23_VERSION                   67
 152 
 153 #define JAVA_24_VERSION                   68
 154 
 155 #define JAVA_25_VERSION                   69
 156 
 157 #define JAVA_26_VERSION                   70
 158 
 159 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
 160   assert((bad_constant == JVM_CONSTANT_Module ||
 161           bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
 162          "Unexpected bad constant pool entry");
 163   if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
 164 }
 165 
 166 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 167                                                   ConstantPool* cp,
 168                                                   const int length,
 169                                                   TRAPS) {
 170   assert(stream != nullptr, "invariant");
 171   assert(cp != nullptr, "invariant");
 172 
 173   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 174   // this function (_current can be allocated in a register, with scalar
 175   // replacement of aggregates). The _current pointer is copied back to
 176   // stream() when this function returns. DON'T call another method within
 177   // this method that uses stream().
 178   const ClassFileStream cfs1 = *stream;
 179   const ClassFileStream* const cfs = &cfs1;
 180 
 181   DEBUG_ONLY(const u1* const old_current = stream->current();)
 182 
 183   // Used for batching symbol allocations.
 184   const char* names[SymbolTable::symbol_alloc_batch_size];
 185   int lengths[SymbolTable::symbol_alloc_batch_size];
 186   int indices[SymbolTable::symbol_alloc_batch_size];
 187   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 188   int names_count = 0;
 189 
 190   // parsing  Index 0 is unused
 191   for (int index = 1; index < length; index++) {
 192     // Each of the following case guarantees one more byte in the stream
 193     // for the following tag or the access_flags following constant pool,
 194     // so we don't need bounds-check for reading tag.
 195     const u1 tag = cfs->get_u1_fast();
 196     switch (tag) {
 197       case JVM_CONSTANT_Class : {
 198         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 199         const u2 name_index = cfs->get_u2_fast();
 200         cp->klass_index_at_put(index, name_index);
 201         break;
 202       }
 203       case JVM_CONSTANT_Fieldref: {
 204         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 205         const u2 class_index = cfs->get_u2_fast();
 206         const u2 name_and_type_index = cfs->get_u2_fast();
 207         cp->field_at_put(index, class_index, name_and_type_index);
 208         break;
 209       }
 210       case JVM_CONSTANT_Methodref: {
 211         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 212         const u2 class_index = cfs->get_u2_fast();
 213         const u2 name_and_type_index = cfs->get_u2_fast();
 214         cp->method_at_put(index, class_index, name_and_type_index);
 215         break;
 216       }
 217       case JVM_CONSTANT_InterfaceMethodref: {
 218         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 219         const u2 class_index = cfs->get_u2_fast();
 220         const u2 name_and_type_index = cfs->get_u2_fast();
 221         cp->interface_method_at_put(index, class_index, name_and_type_index);
 222         break;
 223       }
 224       case JVM_CONSTANT_String : {
 225         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 226         const u2 string_index = cfs->get_u2_fast();
 227         cp->string_index_at_put(index, string_index);
 228         break;
 229       }
 230       case JVM_CONSTANT_MethodHandle :
 231       case JVM_CONSTANT_MethodType: {
 232         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 233           classfile_parse_error(
 234             "Class file version does not support constant tag %u in class file %s",
 235             tag, THREAD);
 236           return;
 237         }
 238         if (tag == JVM_CONSTANT_MethodHandle) {
 239           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 240           const u1 ref_kind = cfs->get_u1_fast();
 241           const u2 method_index = cfs->get_u2_fast();
 242           cp->method_handle_index_at_put(index, ref_kind, method_index);
 243         }
 244         else if (tag == JVM_CONSTANT_MethodType) {
 245           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 246           const u2 signature_index = cfs->get_u2_fast();
 247           cp->method_type_index_at_put(index, signature_index);
 248         }
 249         else {
 250           ShouldNotReachHere();
 251         }
 252         break;
 253       }
 254       case JVM_CONSTANT_Dynamic : {
 255         if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
 256           classfile_parse_error(
 257               "Class file version does not support constant tag %u in class file %s",
 258               tag, THREAD);
 259           return;
 260         }
 261         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 262         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 263         const u2 name_and_type_index = cfs->get_u2_fast();
 264         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 265           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 266         }
 267         cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
 268         break;
 269       }
 270       case JVM_CONSTANT_InvokeDynamic : {
 271         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 272           classfile_parse_error(
 273               "Class file version does not support constant tag %u in class file %s",
 274               tag, THREAD);
 275           return;
 276         }
 277         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 278         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 279         const u2 name_and_type_index = cfs->get_u2_fast();
 280         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 281           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 282         }
 283         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 284         break;
 285       }
 286       case JVM_CONSTANT_Integer: {
 287         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 288         const u4 bytes = cfs->get_u4_fast();
 289         cp->int_at_put(index, (jint)bytes);
 290         break;
 291       }
 292       case JVM_CONSTANT_Float: {
 293         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 294         const u4 bytes = cfs->get_u4_fast();
 295         cp->float_at_put(index, *(jfloat*)&bytes);
 296         break;
 297       }
 298       case JVM_CONSTANT_Long: {
 299         // A mangled type might cause you to overrun allocated memory
 300         guarantee_property(index + 1 < length,
 301                            "Invalid constant pool entry %u in class file %s",
 302                            index,
 303                            CHECK);
 304         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 305         const u8 bytes = cfs->get_u8_fast();
 306         cp->long_at_put(index, bytes);
 307         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 308         break;
 309       }
 310       case JVM_CONSTANT_Double: {
 311         // A mangled type might cause you to overrun allocated memory
 312         guarantee_property(index+1 < length,
 313                            "Invalid constant pool entry %u in class file %s",
 314                            index,
 315                            CHECK);
 316         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 317         const u8 bytes = cfs->get_u8_fast();
 318         cp->double_at_put(index, *(jdouble*)&bytes);
 319         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 320         break;
 321       }
 322       case JVM_CONSTANT_NameAndType: {
 323         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 324         const u2 name_index = cfs->get_u2_fast();
 325         const u2 signature_index = cfs->get_u2_fast();
 326         cp->name_and_type_at_put(index, name_index, signature_index);
 327         break;
 328       }
 329       case JVM_CONSTANT_Utf8 : {
 330         cfs->guarantee_more(2, CHECK);  // utf8_length
 331         u2  utf8_length = cfs->get_u2_fast();
 332         const u1* utf8_buffer = cfs->current();
 333         assert(utf8_buffer != nullptr, "null utf8 buffer");
 334         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 335         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 336         cfs->skip_u1_fast(utf8_length);
 337 
 338         // Before storing the symbol, make sure it's legal
 339         if (_need_verify) {
 340           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 341         }
 342 
 343         unsigned int hash;
 344         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 345                                                         utf8_length,
 346                                                         hash);
 347         if (result == nullptr) {
 348           names[names_count] = (const char*)utf8_buffer;
 349           lengths[names_count] = utf8_length;
 350           indices[names_count] = index;
 351           hashValues[names_count++] = hash;
 352           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 353             SymbolTable::new_symbols(_loader_data,
 354                                      constantPoolHandle(THREAD, cp),
 355                                      names_count,
 356                                      names,
 357                                      lengths,
 358                                      indices,
 359                                      hashValues);
 360             names_count = 0;
 361           }
 362         } else {
 363           cp->symbol_at_put(index, result);
 364         }
 365         break;
 366       }
 367       case JVM_CONSTANT_Module:
 368       case JVM_CONSTANT_Package: {
 369         // Record that an error occurred in these two cases but keep parsing so
 370         // that ACC_Module can be checked for in the access_flags.  Need to
 371         // throw NoClassDefFoundError in that case.
 372         if (_major_version >= JAVA_9_VERSION) {
 373           cfs->guarantee_more(3, CHECK);
 374           cfs->get_u2_fast();
 375           set_class_bad_constant_seen(tag);
 376           break;
 377         }
 378       }
 379       default: {
 380         classfile_parse_error("Unknown constant tag %u in class file %s",
 381                               tag,
 382                               THREAD);
 383         return;
 384       }
 385     } // end of switch(tag)
 386   } // end of for
 387 
 388   // Allocate the remaining symbols
 389   if (names_count > 0) {
 390     SymbolTable::new_symbols(_loader_data,
 391                              constantPoolHandle(THREAD, cp),
 392                              names_count,
 393                              names,
 394                              lengths,
 395                              indices,
 396                              hashValues);
 397   }
 398 
 399   // Copy _current pointer of local copy back to stream.
 400   assert(stream->current() == old_current, "non-exclusive use of stream");
 401   stream->set_current(cfs1.current());
 402 
 403 }
 404 
 405 static inline bool valid_cp_range(int index, int length) {
 406   return (index > 0 && index < length);
 407 }
 408 
 409 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 410   assert(cp != nullptr, "invariant");
 411   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 412     return cp->symbol_at(index);
 413   }
 414   return nullptr;
 415 }
 416 
 417 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 418                                          ConstantPool* const cp,
 419                                          const int length,
 420                                          TRAPS) {
 421   assert(cp != nullptr, "invariant");
 422   assert(stream != nullptr, "invariant");
 423 
 424   // parsing constant pool entries
 425   parse_constant_pool_entries(stream, cp, length, CHECK);
 426   if (class_bad_constant_seen() != 0) {
 427     // a bad CP entry has been detected previously so stop parsing and just return.
 428     return;
 429   }
 430 
 431   int index = 1;  // declared outside of loops for portability
 432   int num_klasses = 0;
 433 
 434   // first verification pass - validate cross references
 435   // and fixup class and string constants
 436   for (index = 1; index < length; index++) {          // Index 0 is unused
 437     const jbyte tag = cp->tag_at(index).value();
 438     switch (tag) {
 439       case JVM_CONSTANT_Class: {
 440         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 441         break;
 442       }
 443       case JVM_CONSTANT_Fieldref:
 444         // fall through
 445       case JVM_CONSTANT_Methodref:
 446         // fall through
 447       case JVM_CONSTANT_InterfaceMethodref: {
 448         if (!_need_verify) break;
 449         const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
 450         const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
 451         guarantee_property(valid_klass_reference_at(klass_ref_index),
 452                        "Invalid constant pool index %u in class file %s",
 453                        klass_ref_index, CHECK);
 454         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 455           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 456           "Invalid constant pool index %u in class file %s",
 457           name_and_type_ref_index, CHECK);
 458         break;
 459       }
 460       case JVM_CONSTANT_String: {
 461         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 462         break;
 463       }
 464       case JVM_CONSTANT_Integer:
 465         break;
 466       case JVM_CONSTANT_Float:
 467         break;
 468       case JVM_CONSTANT_Long:
 469       case JVM_CONSTANT_Double: {
 470         index++;
 471         guarantee_property(
 472           (index < length && cp->tag_at(index).is_invalid()),
 473           "Improper constant pool long/double index %u in class file %s",
 474           index, CHECK);
 475         break;
 476       }
 477       case JVM_CONSTANT_NameAndType: {
 478         if (!_need_verify) break;
 479         const int name_ref_index = cp->name_ref_index_at(index);
 480         const int signature_ref_index = cp->signature_ref_index_at(index);
 481         guarantee_property(valid_symbol_at(name_ref_index),
 482           "Invalid constant pool index %u in class file %s",
 483           name_ref_index, CHECK);
 484         guarantee_property(valid_symbol_at(signature_ref_index),
 485           "Invalid constant pool index %u in class file %s",
 486           signature_ref_index, CHECK);
 487         break;
 488       }
 489       case JVM_CONSTANT_Utf8:
 490         break;
 491       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 492       case JVM_CONSTANT_UnresolvedClassInError: {
 493         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 494         break;
 495       }
 496       case JVM_CONSTANT_ClassIndex: {
 497         const int class_index = cp->klass_index_at(index);
 498         guarantee_property(valid_symbol_at(class_index),
 499           "Invalid constant pool index %u in class file %s",
 500           class_index, CHECK);
 501         cp->unresolved_klass_at_put(index, class_index, num_klasses++);
 502         break;
 503       }
 504       case JVM_CONSTANT_StringIndex: {
 505         const int string_index = cp->string_index_at(index);
 506         guarantee_property(valid_symbol_at(string_index),
 507           "Invalid constant pool index %u in class file %s",
 508           string_index, CHECK);
 509         Symbol* const sym = cp->symbol_at(string_index);
 510         cp->unresolved_string_at_put(index, sym);
 511         break;
 512       }
 513       case JVM_CONSTANT_MethodHandle: {
 514         const int ref_index = cp->method_handle_index_at(index);
 515         guarantee_property(valid_cp_range(ref_index, length),
 516           "Invalid constant pool index %u in class file %s",
 517           ref_index, CHECK);
 518         const constantTag tag = cp->tag_at(ref_index);
 519         const int ref_kind = cp->method_handle_ref_kind_at(index);
 520 
 521         switch (ref_kind) {
 522           case JVM_REF_getField:
 523           case JVM_REF_getStatic:
 524           case JVM_REF_putField:
 525           case JVM_REF_putStatic: {
 526             guarantee_property(
 527               tag.is_field(),
 528               "Invalid constant pool index %u in class file %s (not a field)",
 529               ref_index, CHECK);
 530             break;
 531           }
 532           case JVM_REF_invokeVirtual:
 533           case JVM_REF_newInvokeSpecial: {
 534             guarantee_property(
 535               tag.is_method(),
 536               "Invalid constant pool index %u in class file %s (not a method)",
 537               ref_index, CHECK);
 538             break;
 539           }
 540           case JVM_REF_invokeStatic:
 541           case JVM_REF_invokeSpecial: {
 542             guarantee_property(
 543               tag.is_method() ||
 544               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 545               "Invalid constant pool index %u in class file %s (not a method)",
 546               ref_index, CHECK);
 547             break;
 548           }
 549           case JVM_REF_invokeInterface: {
 550             guarantee_property(
 551               tag.is_interface_method(),
 552               "Invalid constant pool index %u in class file %s (not an interface method)",
 553               ref_index, CHECK);
 554             break;
 555           }
 556           default: {
 557             classfile_parse_error(
 558               "Bad method handle kind at constant pool index %u in class file %s",
 559               index, THREAD);
 560             return;
 561           }
 562         } // switch(refkind)
 563         // Keep the ref_index unchanged.  It will be indirected at link-time.
 564         break;
 565       } // case MethodHandle
 566       case JVM_CONSTANT_MethodType: {
 567         const int ref_index = cp->method_type_index_at(index);
 568         guarantee_property(valid_symbol_at(ref_index),
 569           "Invalid constant pool index %u in class file %s",
 570           ref_index, CHECK);
 571         break;
 572       }
 573       case JVM_CONSTANT_Dynamic: {
 574         const int name_and_type_ref_index =
 575           cp->bootstrap_name_and_type_ref_index_at(index);
 576 
 577         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 578           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 579           "Invalid constant pool index %u in class file %s",
 580           name_and_type_ref_index, CHECK);
 581         // bootstrap specifier index must be checked later,
 582         // when BootstrapMethods attr is available
 583 
 584         // Mark the constant pool as having a CONSTANT_Dynamic_info structure
 585         cp->set_has_dynamic_constant();
 586         break;
 587       }
 588       case JVM_CONSTANT_InvokeDynamic: {
 589         const int name_and_type_ref_index =
 590           cp->bootstrap_name_and_type_ref_index_at(index);
 591 
 592         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 593           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 594           "Invalid constant pool index %u in class file %s",
 595           name_and_type_ref_index, CHECK);
 596         // bootstrap specifier index must be checked later,
 597         // when BootstrapMethods attr is available
 598         break;
 599       }
 600       default: {
 601         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 602         ShouldNotReachHere();
 603         break;
 604       }
 605     } // switch(tag)
 606   } // end of for
 607 
 608   cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
 609 
 610   if (!_need_verify) {
 611     return;
 612   }
 613 
 614   // second verification pass - checks the strings are of the right format.
 615   // but not yet to the other entries
 616   for (index = 1; index < length; index++) {
 617     const jbyte tag = cp->tag_at(index).value();
 618     switch (tag) {
 619       case JVM_CONSTANT_UnresolvedClass: {
 620         const Symbol* const class_name = cp->klass_name_at(index);
 621         // check the name
 622         verify_legal_class_name(class_name, CHECK);
 623         break;
 624       }
 625       case JVM_CONSTANT_NameAndType: {
 626         if (_need_verify) {
 627           const int sig_index = cp->signature_ref_index_at(index);
 628           const int name_index = cp->name_ref_index_at(index);
 629           const Symbol* const name = cp->symbol_at(name_index);
 630           const Symbol* const sig = cp->symbol_at(sig_index);
 631           guarantee_property(sig->utf8_length() != 0,
 632             "Illegal zero length constant pool entry at %d in class %s",
 633             sig_index, CHECK);
 634           guarantee_property(name->utf8_length() != 0,
 635             "Illegal zero length constant pool entry at %d in class %s",
 636             name_index, CHECK);
 637 
 638           if (Signature::is_method(sig)) {
 639             // Format check method name and signature
 640             verify_legal_method_name(name, CHECK);
 641             verify_legal_method_signature(name, sig, CHECK);
 642           } else {
 643             // Format check field name and signature
 644             verify_legal_field_name(name, CHECK);
 645             verify_legal_field_signature(name, sig, CHECK);
 646           }
 647         }
 648         break;
 649       }
 650       case JVM_CONSTANT_Dynamic: {
 651         const int name_and_type_ref_index =
 652           cp->uncached_name_and_type_ref_index_at(index);
 653         // already verified to be utf8
 654         const int name_ref_index =
 655           cp->name_ref_index_at(name_and_type_ref_index);
 656         // already verified to be utf8
 657         const int signature_ref_index =
 658           cp->signature_ref_index_at(name_and_type_ref_index);
 659         const Symbol* const name = cp->symbol_at(name_ref_index);
 660         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 661         if (_need_verify) {
 662           // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
 663           // Need only to be sure signature is the right type.
 664           if (Signature::is_method(signature)) {
 665             throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
 666           }
 667         }
 668         break;
 669       }
 670       case JVM_CONSTANT_InvokeDynamic:
 671       case JVM_CONSTANT_Fieldref:
 672       case JVM_CONSTANT_Methodref:
 673       case JVM_CONSTANT_InterfaceMethodref: {
 674         const int name_and_type_ref_index =
 675           cp->uncached_name_and_type_ref_index_at(index);
 676         // already verified to be utf8
 677         const int name_ref_index =
 678           cp->name_ref_index_at(name_and_type_ref_index);
 679         // already verified to be utf8
 680         const int signature_ref_index =
 681           cp->signature_ref_index_at(name_and_type_ref_index);
 682         const Symbol* const name = cp->symbol_at(name_ref_index);
 683         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 684         if (tag == JVM_CONSTANT_Fieldref) {
 685           if (_need_verify) {
 686             // Field name and signature are verified above, when iterating NameAndType_info.
 687             // Need only to be sure signature is non-zero length and the right type.
 688             if (Signature::is_method(signature)) {
 689               throwIllegalSignature("Field", name, signature, CHECK);
 690             }
 691           }
 692         } else {
 693           if (_need_verify) {
 694             // Method name and signature are individually verified above, when iterating
 695             // NameAndType_info.  Need to check here that signature is non-zero length and
 696             // the right type.
 697             if (!Signature::is_method(signature)) {
 698               throwIllegalSignature("Method", name, signature, CHECK);
 699             }
 700           }
 701           // If a class method name begins with '<', it must be "<init>" and have void signature.
 702           const unsigned int name_len = name->utf8_length();
 703           if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
 704               name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
 705             if (name != vmSymbols::object_initializer_name()) {
 706               classfile_parse_error(
 707                 "Bad method name at constant pool index %u in class file %s",
 708                 name_ref_index, THREAD);
 709               return;
 710             } else if (!Signature::is_void_method(signature)) { // must have void signature.
 711               throwIllegalSignature("Method", name, signature, CHECK);
 712             }
 713           }
 714         }
 715         break;
 716       }
 717       case JVM_CONSTANT_MethodHandle: {
 718         const int ref_index = cp->method_handle_index_at(index);
 719         const int ref_kind = cp->method_handle_ref_kind_at(index);
 720         switch (ref_kind) {
 721           case JVM_REF_invokeVirtual:
 722           case JVM_REF_invokeStatic:
 723           case JVM_REF_invokeSpecial:
 724           case JVM_REF_newInvokeSpecial: {
 725             const int name_and_type_ref_index =
 726               cp->uncached_name_and_type_ref_index_at(ref_index);
 727             const int name_ref_index =
 728               cp->name_ref_index_at(name_and_type_ref_index);
 729             const Symbol* const name = cp->symbol_at(name_ref_index);
 730             if (ref_kind == JVM_REF_newInvokeSpecial) {
 731               if (name != vmSymbols::object_initializer_name()) {
 732                 classfile_parse_error(
 733                   "Bad constructor name at constant pool index %u in class file %s",
 734                     name_ref_index, THREAD);
 735                 return;
 736               }
 737             } else {
 738               if (name == vmSymbols::object_initializer_name()) {
 739                 classfile_parse_error(
 740                   "Bad method name at constant pool index %u in class file %s",
 741                   name_ref_index, THREAD);
 742                 return;
 743               }
 744             }
 745             break;
 746           }
 747           // Other ref_kinds are already fully checked in previous pass.
 748         } // switch(ref_kind)
 749         break;
 750       }
 751       case JVM_CONSTANT_MethodType: {
 752         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 753         const Symbol* const signature = cp->method_type_signature_at(index);
 754         verify_legal_method_signature(no_name, signature, CHECK);
 755         break;
 756       }
 757       case JVM_CONSTANT_Utf8: {
 758         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 759       }
 760     }  // switch(tag)
 761   }  // end of for
 762 }
 763 
 764 class NameSigHash: public ResourceObj {
 765  public:
 766   const Symbol*       _name;       // name
 767   const Symbol*       _sig;        // signature
 768 
 769   static const int HASH_ROW_SIZE = 256;
 770 
 771   NameSigHash(Symbol* name, Symbol* sig) :
 772     _name(name),
 773     _sig(sig) {}
 774 
 775   static unsigned int hash(NameSigHash const& namesig) {
 776     return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
 777   }
 778 
 779   static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
 780     return (e0._name == e1._name) &&
 781           (e0._sig  == e1._sig);
 782   }
 783 };
 784 
 785 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
 786                                            NameSigHash::HASH_ROW_SIZE,
 787                                            AnyObj::RESOURCE_AREA, mtInternal,
 788                                            &NameSigHash::hash, &NameSigHash::equals>;
 789 
 790 // Side-effects: populates the _local_interfaces field
 791 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
 792                                        const int itfs_len,
 793                                        ConstantPool* const cp,
 794                                        bool* const has_nonstatic_concrete_methods,
 795                                        TRAPS) {
 796   assert(stream != nullptr, "invariant");
 797   assert(cp != nullptr, "invariant");
 798   assert(has_nonstatic_concrete_methods != nullptr, "invariant");
 799 
 800   if (itfs_len == 0) {
 801     _local_interfaces = Universe::the_empty_instance_klass_array();
 802   } else {
 803     assert(itfs_len > 0, "only called for len>0");
 804     _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
 805 
 806     int index;
 807     for (index = 0; index < itfs_len; index++) {
 808       const u2 interface_index = stream->get_u2(CHECK);
 809       Klass* interf;
 810       guarantee_property(
 811         valid_klass_reference_at(interface_index),
 812         "Interface name has bad constant pool index %u in class file %s",
 813         interface_index, CHECK);
 814       if (cp->tag_at(interface_index).is_klass()) {
 815         interf = cp->resolved_klass_at(interface_index);
 816       } else {
 817         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
 818 
 819         // Don't need to check legal name because it's checked when parsing constant pool.
 820         // But need to make sure it's not an array type.
 821         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
 822                            "Bad interface name in class file %s", CHECK);
 823 
 824         // Call resolve on the interface class name with class circularity checking
 825         interf = SystemDictionary::resolve_super_or_fail(_class_name,
 826                                                          unresolved_klass,
 827                                                          Handle(THREAD, _loader_data->class_loader()),
 828                                                          false, CHECK);
 829       }
 830 
 831       if (!interf->is_interface()) {
 832         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 833                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
 834                           _class_name->as_klass_external_name(),
 835                           interf->external_name(),
 836                           interf->class_in_module_of_loader()));
 837       }
 838 
 839       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
 840         *has_nonstatic_concrete_methods = true;
 841       }
 842       _local_interfaces->at_put(index, InstanceKlass::cast(interf));
 843     }
 844 
 845     if (!_need_verify || itfs_len <= 1) {
 846       return;
 847     }
 848 
 849     // Check if there's any duplicates in interfaces
 850     ResourceMark rm(THREAD);
 851     // Set containing interface names
 852     ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
 853     for (index = 0; index < itfs_len; index++) {
 854       const InstanceKlass* const k = _local_interfaces->at(index);
 855       Symbol* interface_name = k->name();
 856       // If no duplicates, add (name, nullptr) in hashtable interface_names.
 857       if (!interface_names->put(interface_name, 0)) {
 858         classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
 859                                interface_name->as_C_string(), THREAD);
 860         return;
 861       }
 862     }
 863   }
 864 }
 865 
 866 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 867                                            int constantvalue_index,
 868                                            int signature_index,
 869                                            TRAPS) const {
 870   // Make sure the constant pool entry is of a type appropriate to this field
 871   guarantee_property(
 872     (constantvalue_index > 0 &&
 873       constantvalue_index < cp->length()),
 874     "Bad initial value index %u in ConstantValue attribute in class file %s",
 875     constantvalue_index, CHECK);
 876 
 877   const constantTag value_type = cp->tag_at(constantvalue_index);
 878   switch(cp->basic_type_for_signature_at(signature_index)) {
 879     case T_LONG: {
 880       guarantee_property(value_type.is_long(),
 881                          "Inconsistent constant value type in class file %s",
 882                          CHECK);
 883       break;
 884     }
 885     case T_FLOAT: {
 886       guarantee_property(value_type.is_float(),
 887                          "Inconsistent constant value type in class file %s",
 888                          CHECK);
 889       break;
 890     }
 891     case T_DOUBLE: {
 892       guarantee_property(value_type.is_double(),
 893                          "Inconsistent constant value type in class file %s",
 894                          CHECK);
 895       break;
 896     }
 897     case T_BYTE:
 898     case T_CHAR:
 899     case T_SHORT:
 900     case T_BOOLEAN:
 901     case T_INT: {
 902       guarantee_property(value_type.is_int(),
 903                          "Inconsistent constant value type in class file %s",
 904                          CHECK);
 905       break;
 906     }
 907     case T_OBJECT: {
 908       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 909                          && value_type.is_string()),
 910                          "Bad string initial value in class file %s",
 911                          CHECK);
 912       break;
 913     }
 914     default: {
 915       classfile_parse_error("Unable to set initial value %u in class file %s",
 916                              constantvalue_index,
 917                              THREAD);
 918     }
 919   }
 920 }
 921 
 922 class AnnotationCollector : public ResourceObj{
 923 public:
 924   enum Location { _in_field, _in_method, _in_class };
 925   enum ID {
 926     _unknown = 0,
 927     _method_CallerSensitive,
 928     _method_ForceInline,
 929     _method_DontInline,
 930     _method_ChangesCurrentThread,
 931     _method_JvmtiHideEvents,
 932     _method_JvmtiMountTransition,
 933     _method_InjectedProfile,
 934     _method_LambdaForm_Compiled,
 935     _method_Hidden,
 936     _method_Scoped,
 937     _method_IntrinsicCandidate,
 938     _jdk_internal_vm_annotation_Contended,
 939     _field_Stable,
 940     _jdk_internal_vm_annotation_ReservedStackAccess,
 941     _jdk_internal_ValueBased,
 942     _java_lang_Deprecated,
 943     _java_lang_Deprecated_for_removal,
 944     _annotation_LIMIT
 945   };
 946   const Location _location;
 947   int _annotations_present;
 948   u2 _contended_group;
 949 
 950   AnnotationCollector(Location location)
 951     : _location(location), _annotations_present(0), _contended_group(0)
 952   {
 953     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
 954   }
 955   // If this annotation name has an ID, report it (or _none).
 956   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
 957   // Set the annotation name:
 958   void set_annotation(ID id) {
 959     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 960     _annotations_present |= (int)nth_bit((int)id);
 961   }
 962 
 963   void remove_annotation(ID id) {
 964     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 965     _annotations_present &= (int)~nth_bit((int)id);
 966   }
 967 
 968   // Report if the annotation is present.
 969   bool has_any_annotations() const { return _annotations_present != 0; }
 970   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
 971 
 972   void set_contended_group(u2 group) { _contended_group = group; }
 973   u2 contended_group() const { return _contended_group; }
 974 
 975   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
 976 
 977   void set_stable(bool stable) { set_annotation(_field_Stable); }
 978   bool is_stable() const { return has_annotation(_field_Stable); }
 979 };
 980 
 981 // This class also doubles as a holder for metadata cleanup.
 982 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
 983 private:
 984   ClassLoaderData* _loader_data;
 985   AnnotationArray* _field_annotations;
 986   AnnotationArray* _field_type_annotations;
 987 public:
 988   FieldAnnotationCollector(ClassLoaderData* loader_data) :
 989     AnnotationCollector(_in_field),
 990     _loader_data(loader_data),
 991     _field_annotations(nullptr),
 992     _field_type_annotations(nullptr) {}
 993   ~FieldAnnotationCollector();
 994   void apply_to(FieldInfo* f);
 995   AnnotationArray* field_annotations()      { return _field_annotations; }
 996   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
 997 
 998   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
 999   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1000 };
1001 
1002 class MethodAnnotationCollector : public AnnotationCollector{
1003 public:
1004   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1005   void apply_to(const methodHandle& m);
1006 };
1007 
1008 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1009 public:
1010   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1011   void apply_to(InstanceKlass* ik);
1012 };
1013 
1014 
1015 static int skip_annotation_value(const u1*, int, int); // fwd decl
1016 
1017 // Safely increment index by val if does not pass limit
1018 #define SAFE_ADD(index, limit, val) \
1019 if (index >= limit - val) return limit; \
1020 index += val;
1021 
1022 // Skip an annotation.  Return >=limit if there is any problem.
1023 static int skip_annotation(const u1* buffer, int limit, int index) {
1024   assert(buffer != nullptr, "invariant");
1025   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1026   // value := switch (tag:u1) { ... }
1027   SAFE_ADD(index, limit, 4); // skip atype and read nmem
1028   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1029   while (--nmem >= 0 && index < limit) {
1030     SAFE_ADD(index, limit, 2); // skip member
1031     index = skip_annotation_value(buffer, limit, index);
1032   }
1033   return index;
1034 }
1035 
1036 // Skip an annotation value.  Return >=limit if there is any problem.
1037 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1038   assert(buffer != nullptr, "invariant");
1039 
1040   // value := switch (tag:u1) {
1041   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1042   //   case e: e_class:u2 e_name:u2;
1043   //   case s: s_con:u2;
1044   //   case [: do(nval:u2) {value};
1045   //   case @: annotation;
1046   //   case s: s_con:u2;
1047   // }
1048   SAFE_ADD(index, limit, 1); // read tag
1049   const u1 tag = buffer[index - 1];
1050   switch (tag) {
1051     case 'B':
1052     case 'C':
1053     case 'I':
1054     case 'S':
1055     case 'Z':
1056     case 'D':
1057     case 'F':
1058     case 'J':
1059     case 'c':
1060     case 's':
1061       SAFE_ADD(index, limit, 2);  // skip con or s_con
1062       break;
1063     case 'e':
1064       SAFE_ADD(index, limit, 4);  // skip e_class, e_name
1065       break;
1066     case '[':
1067     {
1068       SAFE_ADD(index, limit, 2); // read nval
1069       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1070       while (--nval >= 0 && index < limit) {
1071         index = skip_annotation_value(buffer, limit, index);
1072       }
1073     }
1074     break;
1075     case '@':
1076       index = skip_annotation(buffer, limit, index);
1077       break;
1078     default:
1079       return limit;  //  bad tag byte
1080   }
1081   return index;
1082 }
1083 
1084 // Sift through annotations, looking for those significant to the VM:
1085 static void parse_annotations(const ConstantPool* const cp,
1086                               const u1* buffer, int limit,
1087                               AnnotationCollector* coll,
1088                               ClassLoaderData* loader_data,
1089                               const bool can_access_vm_annotations) {
1090 
1091   assert(cp != nullptr, "invariant");
1092   assert(buffer != nullptr, "invariant");
1093   assert(coll != nullptr, "invariant");
1094   assert(loader_data != nullptr, "invariant");
1095 
1096   // annotations := do(nann:u2) {annotation}
1097   int index = 2; // read nann
1098   if (index >= limit)  return;
1099   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1100   enum {  // initial annotation layout
1101     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1102     count_off = 2,      // u2   such as 1 (one value)
1103     member_off = 4,     // utf8 such as 'value'
1104     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1105     e_tag_val = 'e',
1106     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1107     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1108     e_size = 11,     // end of 'e' annotation
1109     c_tag_val = 'c',    // payload is type
1110     c_con_off = 7,    // utf8 payload, such as 'I'
1111     c_size = 9,       // end of 'c' annotation
1112     s_tag_val = 's',    // payload is String
1113     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1114     s_size = 9,
1115     b_tag_val = 'Z',  // payload is boolean
1116     min_size = 6        // smallest possible size (zero members)
1117   };
1118   // Cannot add min_size to index in case of overflow MAX_INT
1119   while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1120     int index0 = index;
1121     index = skip_annotation(buffer, limit, index);
1122     const u1* const abase = buffer + index0;
1123     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1124     const int count = Bytes::get_Java_u2((address)abase + count_off);
1125     const Symbol* const aname = check_symbol_at(cp, atype);
1126     if (aname == nullptr)  break;  // invalid annotation name
1127     const Symbol* member = nullptr;
1128     if (count >= 1) {
1129       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1130       member = check_symbol_at(cp, member_index);
1131       if (member == nullptr)  break;  // invalid member name
1132     }
1133 
1134     // Here is where parsing particular annotations will take place.
1135     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1136     if (AnnotationCollector::_unknown == id)  continue;
1137     coll->set_annotation(id);
1138     if (AnnotationCollector::_java_lang_Deprecated == id) {
1139       // @Deprecated can specify forRemoval=true, which we need
1140       // to record for JFR to use. If the annotation is not well-formed
1141       // then we may not be able to determine that.
1142       const u1* offset = abase + member_off;
1143       // There are only 2 members in @Deprecated.
1144       int n_members = MIN2(count, 2);
1145       for (int i = 0; i < n_members; ++i) {
1146         int member_index = Bytes::get_Java_u2((address)offset);
1147         offset += 2;
1148         member = check_symbol_at(cp, member_index);
1149         if (member == vmSymbols::since() &&
1150             (*((address)offset) == s_tag_val)) {
1151           // Found `since` first so skip over it
1152           offset += 3;
1153         }
1154         else if (member == vmSymbols::for_removal() &&
1155                  (*((address)offset) == b_tag_val)) {
1156           const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1157           // No guarantee the entry is valid so check it refers to an int in the CP.
1158           if (cp->is_within_bounds(boolean_value_index) &&
1159               cp->tag_at(boolean_value_index).is_int() &&
1160               cp->int_at(boolean_value_index) == 1) {
1161             // forRemoval == true
1162             coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1163           }
1164           break; // no need to check further
1165         }
1166         else {
1167           // This @Deprecated annotation is malformed so we don't try to
1168           // determine whether forRemoval is set.
1169           break;
1170         }
1171       }
1172       continue; // proceed to next annotation
1173     }
1174 
1175     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1176       // @Contended can optionally specify the contention group.
1177       //
1178       // Contended group defines the equivalence class over the fields:
1179       // the fields within the same contended group are not treated distinct.
1180       // The only exception is default group, which does not incur the
1181       // equivalence. Naturally, contention group for classes is meaningless.
1182       //
1183       // While the contention group is specified as String, annotation
1184       // values are already interned, and we might as well use the constant
1185       // pool index as the group tag.
1186       //
1187       u2 group_index = 0; // default contended group
1188       if (count == 1
1189         && s_size == (index - index0)  // match size
1190         && s_tag_val == *(abase + tag_off)
1191         && member == vmSymbols::value_name()) {
1192         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1193         // No guarantee the group_index is valid so check it refers to a
1194         // symbol in the CP.
1195         if (cp->is_within_bounds(group_index) &&
1196             cp->tag_at(group_index).is_utf8()) {
1197           // Seems valid, so check for empty string and reset
1198           if (cp->symbol_at(group_index)->utf8_length() == 0) {
1199             group_index = 0; // default contended group
1200           }
1201         } else {
1202           // Not valid so use the default
1203           group_index = 0;
1204         }
1205       }
1206       coll->set_contended_group(group_index);
1207       continue; // proceed to next annotation
1208     }
1209   }
1210 }
1211 
1212 
1213 // Parse attributes for a field.
1214 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1215                                              u2 attributes_count,
1216                                              bool is_static, u2 signature_index,
1217                                              u2* const constantvalue_index_addr,
1218                                              bool* const is_synthetic_addr,
1219                                              u2* const generic_signature_index_addr,
1220                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1221                                              TRAPS) {
1222   assert(cfs != nullptr, "invariant");
1223   assert(constantvalue_index_addr != nullptr, "invariant");
1224   assert(is_synthetic_addr != nullptr, "invariant");
1225   assert(generic_signature_index_addr != nullptr, "invariant");
1226   assert(parsed_annotations != nullptr, "invariant");
1227   assert(attributes_count > 0, "attributes_count should be greater than 0");
1228 
1229   u2 constantvalue_index = 0;
1230   u2 generic_signature_index = 0;
1231   bool is_synthetic = false;
1232   const u1* runtime_visible_annotations = nullptr;
1233   int runtime_visible_annotations_length = 0;
1234   const u1* runtime_visible_type_annotations = nullptr;
1235   int runtime_visible_type_annotations_length = 0;
1236   bool runtime_invisible_annotations_exists = false;
1237   bool runtime_invisible_type_annotations_exists = false;
1238   const ConstantPool* const cp = _cp;
1239 
1240   while (attributes_count--) {
1241     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1242     const u2 attribute_name_index = cfs->get_u2_fast();
1243     const u4 attribute_length = cfs->get_u4_fast();
1244     guarantee_property(valid_symbol_at(attribute_name_index),
1245                        "Invalid field attribute index %u in class file %s",
1246                        attribute_name_index,
1247                        CHECK);
1248 
1249     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1250     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1251       // ignore if non-static
1252       if (constantvalue_index != 0) {
1253         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1254         return;
1255       }
1256       guarantee_property(
1257         attribute_length == 2,
1258         "Invalid ConstantValue field attribute length %u in class file %s",
1259         attribute_length, CHECK);
1260 
1261       constantvalue_index = cfs->get_u2(CHECK);
1262       if (_need_verify) {
1263         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1264       }
1265     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1266       if (attribute_length != 0) {
1267         classfile_parse_error(
1268           "Invalid Synthetic field attribute length %u in class file %s",
1269           attribute_length, THREAD);
1270         return;
1271       }
1272       is_synthetic = true;
1273     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1274       if (attribute_length != 0) {
1275         classfile_parse_error(
1276           "Invalid Deprecated field attribute length %u in class file %s",
1277           attribute_length, THREAD);
1278         return;
1279       }
1280     } else if (_major_version >= JAVA_1_5_VERSION) {
1281       if (attribute_name == vmSymbols::tag_signature()) {
1282         if (generic_signature_index != 0) {
1283           classfile_parse_error(
1284             "Multiple Signature attributes for field in class file %s", THREAD);
1285           return;
1286         }
1287         if (attribute_length != 2) {
1288           classfile_parse_error(
1289             "Wrong size %u for field's Signature attribute in class file %s",
1290             attribute_length, THREAD);
1291           return;
1292         }
1293         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1294       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1295         if (runtime_visible_annotations != nullptr) {
1296           classfile_parse_error(
1297             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1298           return;
1299         }
1300         runtime_visible_annotations_length = attribute_length;
1301         runtime_visible_annotations = cfs->current();
1302         assert(runtime_visible_annotations != nullptr, "null visible annotations");
1303         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1304         parse_annotations(cp,
1305                           runtime_visible_annotations,
1306                           runtime_visible_annotations_length,
1307                           parsed_annotations,
1308                           _loader_data,
1309                           _can_access_vm_annotations);
1310         cfs->skip_u1_fast(runtime_visible_annotations_length);
1311       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1312         if (runtime_invisible_annotations_exists) {
1313           classfile_parse_error(
1314             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1315           return;
1316         }
1317         runtime_invisible_annotations_exists = true;
1318         cfs->skip_u1(attribute_length, CHECK);
1319       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1320         if (runtime_visible_type_annotations != nullptr) {
1321           classfile_parse_error(
1322             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1323           return;
1324         }
1325         runtime_visible_type_annotations_length = attribute_length;
1326         runtime_visible_type_annotations = cfs->current();
1327         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1328         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1329       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1330         if (runtime_invisible_type_annotations_exists) {
1331           classfile_parse_error(
1332             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1333           return;
1334         } else {
1335           runtime_invisible_type_annotations_exists = true;
1336         }
1337         cfs->skip_u1(attribute_length, CHECK);
1338       } else {
1339         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1340       }
1341     } else {
1342       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1343     }
1344   }
1345 
1346   *constantvalue_index_addr = constantvalue_index;
1347   *is_synthetic_addr = is_synthetic;
1348   *generic_signature_index_addr = generic_signature_index;
1349   AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1350                                             runtime_visible_annotations_length,
1351                                             CHECK);
1352   parsed_annotations->set_field_annotations(a);
1353   a = allocate_annotations(runtime_visible_type_annotations,
1354                            runtime_visible_type_annotations_length,
1355                            CHECK);
1356   parsed_annotations->set_field_type_annotations(a);
1357   return;
1358 }
1359 
1360 
1361 // Side-effects: populates the _fields, _fields_annotations,
1362 // _fields_type_annotations fields
1363 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1364                                    bool is_interface,
1365                                    ConstantPool* cp,
1366                                    const int cp_size,
1367                                    u2* const java_fields_count_ptr,
1368                                    TRAPS) {
1369 
1370   assert(cfs != nullptr, "invariant");
1371   assert(cp != nullptr, "invariant");
1372   assert(java_fields_count_ptr != nullptr, "invariant");
1373 
1374   assert(nullptr == _fields_annotations, "invariant");
1375   assert(nullptr == _fields_type_annotations, "invariant");
1376 
1377   cfs->guarantee_more(2, CHECK);  // length
1378   const u2 length = cfs->get_u2_fast();
1379   *java_fields_count_ptr = length;
1380 
1381   int num_injected = 0;
1382   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1383                                                                   &num_injected);
1384   const int total_fields = length + num_injected;
1385 
1386   // Allocate a temporary resource array to collect field data.
1387   // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1388   _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1389 
1390   ResourceMark rm(THREAD);
1391   for (int n = 0; n < length; n++) {
1392     // access_flags, name_index, descriptor_index, attributes_count
1393     cfs->guarantee_more(8, CHECK);
1394 
1395     AccessFlags access_flags;
1396     const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1397     verify_legal_field_modifiers(flags, is_interface, CHECK);
1398     access_flags.set_flags(flags);
1399     FieldInfo::FieldFlags fieldFlags(0);
1400 
1401     const u2 name_index = cfs->get_u2_fast();
1402     guarantee_property(valid_symbol_at(name_index),
1403       "Invalid constant pool index %u for field name in class file %s",
1404       name_index, CHECK);
1405     const Symbol* const name = cp->symbol_at(name_index);
1406     verify_legal_field_name(name, CHECK);
1407 
1408     const u2 signature_index = cfs->get_u2_fast();
1409     guarantee_property(valid_symbol_at(signature_index),
1410       "Invalid constant pool index %u for field signature in class file %s",
1411       signature_index, CHECK);
1412     const Symbol* const sig = cp->symbol_at(signature_index);
1413     verify_legal_field_signature(name, sig, CHECK);
1414 
1415     u2 constantvalue_index = 0;
1416     bool is_synthetic = false;
1417     u2 generic_signature_index = 0;
1418     const bool is_static = access_flags.is_static();
1419     FieldAnnotationCollector parsed_annotations(_loader_data);
1420 
1421     const u2 attributes_count = cfs->get_u2_fast();
1422     if (attributes_count > 0) {
1423       parse_field_attributes(cfs,
1424                              attributes_count,
1425                              is_static,
1426                              signature_index,
1427                              &constantvalue_index,
1428                              &is_synthetic,
1429                              &generic_signature_index,
1430                              &parsed_annotations,
1431                              CHECK);
1432 
1433       if (parsed_annotations.field_annotations() != nullptr) {
1434         if (_fields_annotations == nullptr) {
1435           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1436                                              _loader_data, length, nullptr,
1437                                              CHECK);
1438         }
1439         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1440         parsed_annotations.set_field_annotations(nullptr);
1441       }
1442       if (parsed_annotations.field_type_annotations() != nullptr) {
1443         if (_fields_type_annotations == nullptr) {
1444           _fields_type_annotations =
1445             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1446                                                          length,
1447                                                          nullptr,
1448                                                          CHECK);
1449         }
1450         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1451         parsed_annotations.set_field_type_annotations(nullptr);
1452       }
1453 
1454       if (is_synthetic) {
1455         access_flags.set_is_synthetic();
1456       }
1457       if (generic_signature_index != 0) {
1458         fieldFlags.update_generic(true);
1459       }
1460     }
1461 
1462     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1463 
1464     // Update number of static oop fields.
1465     if (is_static && is_reference_type(type)) {
1466       _static_oop_count++;
1467     }
1468 
1469     FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1470     fi.set_index(n);
1471     if (fieldFlags.is_generic()) {
1472       fi.set_generic_signature_index(generic_signature_index);
1473     }
1474     parsed_annotations.apply_to(&fi);
1475     if (fi.field_flags().is_contended()) {
1476       _has_contended_fields = true;
1477     }
1478     _temp_field_info->append(fi);
1479   }
1480   assert(_temp_field_info->length() == length, "Must be");
1481 
1482   int index = length;
1483   if (num_injected != 0) {
1484     for (int n = 0; n < num_injected; n++) {
1485       // Check for duplicates
1486       if (injected[n].may_be_java) {
1487         const Symbol* const name      = injected[n].name();
1488         const Symbol* const signature = injected[n].signature();
1489         bool duplicate = false;
1490         for (int i = 0; i < length; i++) {
1491           const FieldInfo* const f = _temp_field_info->adr_at(i);
1492           if (name      == cp->symbol_at(f->name_index()) &&
1493               signature == cp->symbol_at(f->signature_index())) {
1494             // Symbol is desclared in Java so skip this one
1495             duplicate = true;
1496             break;
1497           }
1498         }
1499         if (duplicate) {
1500           // These will be removed from the field array at the end
1501           continue;
1502         }
1503       }
1504 
1505       // Injected field
1506       FieldInfo::FieldFlags fflags(0);
1507       fflags.update_injected(true);
1508       AccessFlags aflags;
1509       FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1510       fi.set_index(index);
1511       _temp_field_info->append(fi);
1512       index++;
1513     }
1514   }
1515 
1516   assert(_temp_field_info->length() == index, "Must be");
1517 
1518   if (_need_verify && length > 1) {
1519     // Check duplicated fields
1520     ResourceMark rm(THREAD);
1521     // Set containing name-signature pairs
1522     NameSigHashtable* names_and_sigs = new NameSigHashtable();
1523     for (int i = 0; i < _temp_field_info->length(); i++) {
1524       NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1525                                _temp_field_info->adr_at(i)->signature(_cp));
1526       // If no duplicates, add name/signature in hashtable names_and_sigs.
1527       if(!names_and_sigs->put(name_and_sig, 0)) {
1528         classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1529                                name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1530         return;
1531       }
1532     }
1533   }
1534 }
1535 
1536 
1537 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1538                                                                          u4 code_length,
1539                                                                          u4 exception_table_length,
1540                                                                          TRAPS) {
1541   assert(cfs != nullptr, "invariant");
1542 
1543   const unsafe_u2* const exception_table_start = cfs->current();
1544   assert(exception_table_start != nullptr, "null exception table");
1545 
1546   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1547                                                                // end_pc,
1548                                                                // handler_pc,
1549                                                                // catch_type_index
1550 
1551   // Will check legal target after parsing code array in verifier.
1552   if (_need_verify) {
1553     for (unsigned int i = 0; i < exception_table_length; i++) {
1554       const u2 start_pc = cfs->get_u2_fast();
1555       const u2 end_pc = cfs->get_u2_fast();
1556       const u2 handler_pc = cfs->get_u2_fast();
1557       const u2 catch_type_index = cfs->get_u2_fast();
1558       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1559                          "Illegal exception table range in class file %s",
1560                          CHECK_NULL);
1561       guarantee_property(handler_pc < code_length,
1562                          "Illegal exception table handler in class file %s",
1563                          CHECK_NULL);
1564       if (catch_type_index != 0) {
1565         guarantee_property(valid_klass_reference_at(catch_type_index),
1566                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1567       }
1568     }
1569   } else {
1570     cfs->skip_u2_fast(exception_table_length * 4);
1571   }
1572   return exception_table_start;
1573 }
1574 
1575 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1576                                              u4 code_length,
1577                                              CompressedLineNumberWriteStream**const write_stream,
1578                                              TRAPS) {
1579 
1580   const ClassFileStream* const cfs = _stream;
1581   unsigned int num_entries = cfs->get_u2(CHECK);
1582 
1583   // Each entry is a u2 start_pc, and a u2 line_number
1584   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1585 
1586   // Verify line number attribute and table length
1587   guarantee_property(
1588     code_attribute_length == sizeof(u2) + length_in_bytes,
1589     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1590 
1591   cfs->guarantee_more(length_in_bytes, CHECK);
1592 
1593   if ((*write_stream) == nullptr) {
1594     if (length_in_bytes > fixed_buffer_size) {
1595       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1596     } else {
1597       (*write_stream) = new CompressedLineNumberWriteStream(
1598         _linenumbertable_buffer, fixed_buffer_size);
1599     }
1600   }
1601 
1602   while (num_entries-- > 0) {
1603     const u2 bci  = cfs->get_u2_fast(); // start_pc
1604     const u2 line = cfs->get_u2_fast(); // line_number
1605     guarantee_property(bci < code_length,
1606         "Invalid pc in LineNumberTable in class file %s", CHECK);
1607     (*write_stream)->write_pair(bci, line);
1608   }
1609 }
1610 
1611 
1612 class LVT_Hash : public AllStatic {
1613  public:
1614 
1615   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1616   /*
1617    * 3-tuple start_bci/length/slot has to be unique key,
1618    * so the following comparison seems to be redundant:
1619    *       && elem->name_cp_index == entry->_elem->name_cp_index
1620    */
1621     return (e0.start_bci     == e1.start_bci &&
1622             e0.length        == e1.length &&
1623             e0.name_cp_index == e1.name_cp_index &&
1624             e0.slot          == e1.slot);
1625   }
1626 
1627   static unsigned int hash(LocalVariableTableElement const& e0) {
1628     unsigned int raw_hash = e0.start_bci;
1629 
1630     raw_hash = e0.length        + raw_hash * 37;
1631     raw_hash = e0.name_cp_index + raw_hash * 37;
1632     raw_hash = e0.slot          + raw_hash * 37;
1633 
1634     return raw_hash;
1635   }
1636 };
1637 
1638 
1639 // Class file LocalVariableTable elements.
1640 class Classfile_LVT_Element {
1641  public:
1642   u2 start_bci;
1643   u2 length;
1644   u2 name_cp_index;
1645   u2 descriptor_cp_index;
1646   u2 slot;
1647 };
1648 
1649 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1650                              LocalVariableTableElement* const lvt) {
1651   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1652   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1653   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1654   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1655   lvt->signature_cp_index  = 0;
1656   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1657 }
1658 
1659 // Function is used to parse both attributes:
1660 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1661 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1662                                                                              u4 code_length,
1663                                                                              u2 max_locals,
1664                                                                              u4 code_attribute_length,
1665                                                                              u2* const localvariable_table_length,
1666                                                                              bool isLVTT,
1667                                                                              TRAPS) {
1668   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1669   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1670   const unsigned int size = checked_cast<unsigned>(
1671     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1672 
1673   const ConstantPool* const cp = _cp;
1674 
1675   // Verify local variable table attribute has right length
1676   if (_need_verify) {
1677     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1678                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1679   }
1680 
1681   const unsafe_u2* const localvariable_table_start = cfs->current();
1682   assert(localvariable_table_start != nullptr, "null local variable table");
1683   if (!_need_verify) {
1684     cfs->skip_u2_fast(size);
1685   } else {
1686     cfs->guarantee_more(size * 2, CHECK_NULL);
1687     for(int i = 0; i < (*localvariable_table_length); i++) {
1688       const u2 start_pc = cfs->get_u2_fast();
1689       const u2 length = cfs->get_u2_fast();
1690       const u2 name_index = cfs->get_u2_fast();
1691       const u2 descriptor_index = cfs->get_u2_fast();
1692       const u2 index = cfs->get_u2_fast();
1693       // Assign to a u4 to avoid overflow
1694       const u4 end_pc = (u4)start_pc + (u4)length;
1695 
1696       if (start_pc >= code_length) {
1697         classfile_parse_error(
1698           "Invalid start_pc %u in %s in class file %s",
1699           start_pc, tbl_name, THREAD);
1700         return nullptr;
1701       }
1702       if (end_pc > code_length) {
1703         classfile_parse_error(
1704           "Invalid length %u in %s in class file %s",
1705           length, tbl_name, THREAD);
1706         return nullptr;
1707       }
1708       const int cp_size = cp->length();
1709       guarantee_property(valid_symbol_at(name_index),
1710         "Name index %u in %s has bad constant type in class file %s",
1711         name_index, tbl_name, CHECK_NULL);
1712       guarantee_property(valid_symbol_at(descriptor_index),
1713         "Signature index %u in %s has bad constant type in class file %s",
1714         descriptor_index, tbl_name, CHECK_NULL);
1715 
1716       const Symbol* const name = cp->symbol_at(name_index);
1717       const Symbol* const sig = cp->symbol_at(descriptor_index);
1718       verify_legal_field_name(name, CHECK_NULL);
1719       u2 extra_slot = 0;
1720       if (!isLVTT) {
1721         verify_legal_field_signature(name, sig, CHECK_NULL);
1722 
1723         // 4894874: check special cases for double and long local variables
1724         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1725             sig == vmSymbols::type_signature(T_LONG)) {
1726           extra_slot = 1;
1727         }
1728       }
1729       guarantee_property((index + extra_slot) < max_locals,
1730                           "Invalid index %u in %s in class file %s",
1731                           index, tbl_name, CHECK_NULL);
1732     }
1733   }
1734   return localvariable_table_start;
1735 }
1736 
1737 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1738                                       u4 code_attribute_length,
1739                                       TRAPS) {
1740   assert(cfs != nullptr, "invariant");
1741 
1742   if (0 == code_attribute_length) {
1743     return nullptr;
1744   }
1745 
1746   const u1* const stackmap_table_start = cfs->current();
1747   assert(stackmap_table_start != nullptr, "null stackmap table");
1748 
1749   // check code_attribute_length
1750   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1751 
1752   return stackmap_table_start;
1753 }
1754 
1755 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1756                                                                             u2* const checked_exceptions_length,
1757                                                                             u4 method_attribute_length,
1758                                                                             TRAPS) {
1759   assert(cfs != nullptr, "invariant");
1760   assert(checked_exceptions_length != nullptr, "invariant");
1761 
1762   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1763   *checked_exceptions_length = cfs->get_u2_fast();
1764   const unsigned int size =
1765     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1766   const unsafe_u2* const checked_exceptions_start = cfs->current();
1767   assert(checked_exceptions_start != nullptr, "null checked exceptions");
1768   if (!_need_verify) {
1769     cfs->skip_u2_fast(size);
1770   } else {
1771     // Verify each value in the checked exception table
1772     u2 checked_exception;
1773     const u2 len = *checked_exceptions_length;
1774     cfs->guarantee_more(2 * len, CHECK_NULL);
1775     for (int i = 0; i < len; i++) {
1776       checked_exception = cfs->get_u2_fast();
1777       guarantee_property(
1778         valid_klass_reference_at(checked_exception),
1779         "Exception name has bad type at constant pool %u in class file %s",
1780         checked_exception, CHECK_NULL);
1781     }
1782   }
1783   // check exceptions attribute length
1784   if (_need_verify) {
1785     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1786                                                    sizeof(u2) * size),
1787                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1788   }
1789   return checked_exceptions_start;
1790 }
1791 
1792 void ClassFileParser::throwIllegalSignature(const char* type,
1793                                             const Symbol* name,
1794                                             const Symbol* sig,
1795                                             TRAPS) const {
1796   assert(name != nullptr, "invariant");
1797   assert(sig != nullptr, "invariant");
1798 
1799   ResourceMark rm(THREAD);
1800   // Names are all known to be < 64k so we know this formatted message is not excessively large.
1801   Exceptions::fthrow(THREAD_AND_LOCATION,
1802       vmSymbols::java_lang_ClassFormatError(),
1803       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1804       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1805 }
1806 
1807 AnnotationCollector::ID
1808 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1809                                       const Symbol* name,
1810                                       const bool can_access_vm_annotations) {
1811   const vmSymbolID sid = vmSymbols::find_sid(name);
1812   // Privileged code can use all annotations.  Other code silently drops some.
1813   const bool privileged = loader_data->is_boot_class_loader_data() ||
1814                           loader_data->is_platform_class_loader_data() ||
1815                           can_access_vm_annotations;
1816   switch (sid) {
1817     case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1818       if (_location != _in_method)  break;  // only allow for methods
1819       if (!privileged)              break;  // only allow in privileged code
1820       return _method_CallerSensitive;
1821     }
1822     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1823       if (_location != _in_method)  break;  // only allow for methods
1824       if (!privileged)              break;  // only allow in privileged code
1825       return _method_ForceInline;
1826     }
1827     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1828       if (_location != _in_method)  break;  // only allow for methods
1829       if (!privileged)              break;  // only allow in privileged code
1830       return _method_DontInline;
1831     }
1832     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1833       if (_location != _in_method)  break;  // only allow for methods
1834       if (!privileged)              break;  // only allow in privileged code
1835       return _method_ChangesCurrentThread;
1836     }
1837     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1838       if (_location != _in_method)  break;  // only allow for methods
1839       if (!privileged)              break;  // only allow in privileged code
1840       return _method_JvmtiHideEvents;
1841     }
1842     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1843       if (_location != _in_method)  break;  // only allow for methods
1844       if (!privileged)              break;  // only allow in privileged code
1845       return _method_JvmtiMountTransition;
1846     }
1847     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1848       if (_location != _in_method)  break;  // only allow for methods
1849       if (!privileged)              break;  // only allow in privileged code
1850       return _method_InjectedProfile;
1851     }
1852     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1853       if (_location != _in_method)  break;  // only allow for methods
1854       if (!privileged)              break;  // only allow in privileged code
1855       return _method_LambdaForm_Compiled;
1856     }
1857     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1858       if (_location != _in_method)  break;  // only allow for methods
1859       if (!privileged)              break;  // only allow in privileged code
1860       return _method_Hidden;
1861     }
1862     case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1863       if (_location != _in_method)  break;  // only allow for methods
1864       if (!privileged)              break;  // only allow in privileged code
1865       return _method_Scoped;
1866     }
1867     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1868       if (_location != _in_method)  break;  // only allow for methods
1869       if (!privileged)              break;  // only allow in privileged code
1870       return _method_IntrinsicCandidate;
1871     }
1872     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1873       if (_location != _in_field)   break;  // only allow for fields
1874       if (!privileged)              break;  // only allow in privileged code
1875       return _field_Stable;
1876     }
1877     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1878       if (_location != _in_field && _location != _in_class) {
1879         break;  // only allow for fields and classes
1880       }
1881       if (!EnableContended || (RestrictContended && !privileged)) {
1882         break;  // honor privileges
1883       }
1884       return _jdk_internal_vm_annotation_Contended;
1885     }
1886     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1887       if (_location != _in_method)  break;  // only allow for methods
1888       if (RestrictReservedStack && !privileged) break; // honor privileges
1889       return _jdk_internal_vm_annotation_ReservedStackAccess;
1890     }
1891     case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1892       if (_location != _in_class)   break;  // only allow for classes
1893       if (!privileged)              break;  // only allow in privileged code
1894       return _jdk_internal_ValueBased;
1895     }
1896     case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1897       return _java_lang_Deprecated;
1898     }
1899     default: {
1900       break;
1901     }
1902   }
1903   return AnnotationCollector::_unknown;
1904 }
1905 
1906 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1907   if (is_contended())
1908     // Setting the contended group also sets the contended bit in field flags
1909     f->set_contended_group(contended_group());
1910   if (is_stable())
1911     (f->field_flags_addr())->update_stable(true);
1912 }
1913 
1914 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1915   // If there's an error deallocate metadata for field annotations
1916   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1917   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1918 }
1919 
1920 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1921   if (has_annotation(_method_CallerSensitive))
1922     m->set_caller_sensitive();
1923   if (has_annotation(_method_ForceInline))
1924     m->set_force_inline();
1925   if (has_annotation(_method_DontInline))
1926     m->set_dont_inline();
1927   if (has_annotation(_method_ChangesCurrentThread))
1928     m->set_changes_current_thread();
1929   if (has_annotation(_method_JvmtiHideEvents))
1930     m->set_jvmti_hide_events();
1931   if (has_annotation(_method_JvmtiMountTransition))
1932     m->set_jvmti_mount_transition();
1933   if (has_annotation(_method_InjectedProfile))
1934     m->set_has_injected_profile();
1935   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1936     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1937   if (has_annotation(_method_Hidden))
1938     m->set_is_hidden();
1939   if (has_annotation(_method_Scoped))
1940     m->set_scoped();
1941   if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
1942     m->set_intrinsic_candidate();
1943   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
1944     m->set_has_reserved_stack_access();
1945   if (has_annotation(_java_lang_Deprecated))
1946     m->set_deprecated();
1947   if (has_annotation(_java_lang_Deprecated_for_removal))
1948     m->set_deprecated_for_removal();
1949 }
1950 
1951 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
1952   assert(ik != nullptr, "invariant");
1953   if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
1954     ik->set_is_contended(is_contended());
1955   }
1956   if (has_annotation(_jdk_internal_ValueBased)) {
1957     ik->set_has_value_based_class_annotation();
1958     if (DiagnoseSyncOnValueBasedClasses) {
1959       ik->set_is_value_based();
1960     }
1961   }
1962   if (has_annotation(_java_lang_Deprecated)) {
1963     Array<Method*>* methods = ik->methods();
1964     int length = ik->methods()->length();
1965     for (int i = 0; i < length; i++) {
1966       Method* m = methods->at(i);
1967       m->set_deprecated();
1968     }
1969   }
1970   if (has_annotation(_java_lang_Deprecated_for_removal)) {
1971     Array<Method*>* methods = ik->methods();
1972     int length = ik->methods()->length();
1973     for (int i = 0; i < length; i++) {
1974       Method* m = methods->at(i);
1975       m->set_deprecated_for_removal();
1976     }
1977   }
1978 }
1979 
1980 #define MAX_ARGS_SIZE 255
1981 #define MAX_CODE_SIZE 65535
1982 #define INITIAL_MAX_LVT_NUMBER 256
1983 
1984 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1985  *
1986  * Rules for LVT's and LVTT's are:
1987  *   - There can be any number of LVT's and LVTT's.
1988  *   - If there are n LVT's, it is the same as if there was just
1989  *     one LVT containing all the entries from the n LVT's.
1990  *   - There may be no more than one LVT entry per local variable.
1991  *     Two LVT entries are 'equal' if these fields are the same:
1992  *        start_pc, length, name, slot
1993  *   - There may be no more than one LVTT entry per each LVT entry.
1994  *     Each LVTT entry has to match some LVT entry.
1995  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1996  */
1997 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
1998                                                int lvt_cnt,
1999                                                u2* const localvariable_table_length,
2000                                                const unsafe_u2** const localvariable_table_start,
2001                                                int lvtt_cnt,
2002                                                u2* const localvariable_type_table_length,
2003                                                const unsafe_u2** const localvariable_type_table_start,
2004                                                TRAPS) {
2005 
2006   ResourceMark rm(THREAD);
2007 
2008   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2009                             256, AnyObj::RESOURCE_AREA, mtInternal,
2010                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2011 
2012   LVT_HashTable* const table = new LVT_HashTable();
2013 
2014   // To fill LocalVariableTable in
2015   const Classfile_LVT_Element* cf_lvt;
2016   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2017 
2018   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2019     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2020     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2021       copy_lvt_element(&cf_lvt[idx], lvt);
2022       // If no duplicates, add LVT elem in hashtable.
2023       if (table->put(*lvt, lvt) == false
2024           && _need_verify
2025           && _major_version >= JAVA_1_5_VERSION) {
2026         classfile_parse_error("Duplicated LocalVariableTable attribute "
2027                               "entry for '%s' in class file %s",
2028                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2029                                THREAD);
2030         return;
2031       }
2032     }
2033   }
2034 
2035   // To merge LocalVariableTable and LocalVariableTypeTable
2036   const Classfile_LVT_Element* cf_lvtt;
2037   LocalVariableTableElement lvtt_elem;
2038 
2039   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2040     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2041     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2042       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2043       LocalVariableTableElement** entry = table->get(lvtt_elem);
2044       if (entry == nullptr) {
2045         if (_need_verify) {
2046           classfile_parse_error("LVTT entry for '%s' in class file %s "
2047                                 "does not match any LVT entry",
2048                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2049                                  THREAD);
2050           return;
2051         }
2052       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2053         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2054                               "entry for '%s' in class file %s",
2055                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2056                                THREAD);
2057         return;
2058       } else {
2059         // to add generic signatures into LocalVariableTable
2060         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2061       }
2062     }
2063   }
2064 }
2065 
2066 
2067 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2068                                        const u1* runtime_visible_annotations,
2069                                        int runtime_visible_annotations_length,
2070                                        const u1* runtime_visible_parameter_annotations,
2071                                        int runtime_visible_parameter_annotations_length,
2072                                        const u1* runtime_visible_type_annotations,
2073                                        int runtime_visible_type_annotations_length,
2074                                        const u1* annotation_default,
2075                                        int annotation_default_length,
2076                                        TRAPS) {
2077 
2078   AnnotationArray* a;
2079 
2080   if (runtime_visible_annotations_length > 0) {
2081      a = allocate_annotations(runtime_visible_annotations,
2082                               runtime_visible_annotations_length,
2083                               CHECK);
2084      cm->set_method_annotations(a);
2085   }
2086 
2087   if (runtime_visible_parameter_annotations_length > 0) {
2088     a = allocate_annotations(runtime_visible_parameter_annotations,
2089                              runtime_visible_parameter_annotations_length,
2090                              CHECK);
2091     cm->set_parameter_annotations(a);
2092   }
2093 
2094   if (annotation_default_length > 0) {
2095     a = allocate_annotations(annotation_default,
2096                              annotation_default_length,
2097                              CHECK);
2098     cm->set_default_annotations(a);
2099   }
2100 
2101   if (runtime_visible_type_annotations_length > 0) {
2102     a = allocate_annotations(runtime_visible_type_annotations,
2103                              runtime_visible_type_annotations_length,
2104                              CHECK);
2105     cm->set_type_annotations(a);
2106   }
2107 }
2108 
2109 
2110 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2111 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2112 // Method* to save footprint, so we only know the size of the resulting Method* when the
2113 // entire method attribute is parsed.
2114 //
2115 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2116 
2117 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2118                                       bool is_interface,
2119                                       const ConstantPool* cp,
2120                                       bool* const has_localvariable_table,
2121                                       TRAPS) {
2122   assert(cfs != nullptr, "invariant");
2123   assert(cp != nullptr, "invariant");
2124   assert(has_localvariable_table != nullptr, "invariant");
2125 
2126   ResourceMark rm(THREAD);
2127   // Parse fixed parts:
2128   // access_flags, name_index, descriptor_index, attributes_count
2129   cfs->guarantee_more(8, CHECK_NULL);
2130 
2131   u2 flags = cfs->get_u2_fast();
2132   const u2 name_index = cfs->get_u2_fast();
2133   const int cp_size = cp->length();
2134   guarantee_property(
2135     valid_symbol_at(name_index),
2136     "Illegal constant pool index %u for method name in class file %s",
2137     name_index, CHECK_NULL);
2138   const Symbol* const name = cp->symbol_at(name_index);
2139   verify_legal_method_name(name, CHECK_NULL);
2140 
2141   const u2 signature_index = cfs->get_u2_fast();
2142   guarantee_property(
2143     valid_symbol_at(signature_index),
2144     "Illegal constant pool index %u for method signature in class file %s",
2145     signature_index, CHECK_NULL);
2146   const Symbol* const signature = cp->symbol_at(signature_index);
2147 
2148   if (name == vmSymbols::class_initializer_name()) {
2149     // We ignore the other access flags for a valid class initializer.
2150     // (JVM Spec 2nd ed., chapter 4.6)
2151     if (_major_version < 51) { // backward compatibility
2152       flags = JVM_ACC_STATIC;
2153     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2154       flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2155     } else {
2156       classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2157       return nullptr;
2158     }
2159   } else {
2160     verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2161   }
2162 
2163   if (name == vmSymbols::object_initializer_name() && is_interface) {
2164     classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2165     return nullptr;
2166   }
2167 
2168   int args_size = -1;  // only used when _need_verify is true
2169   if (_need_verify) {
2170     verify_legal_name_with_signature(name, signature, CHECK_NULL);
2171     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2172                  verify_legal_method_signature(name, signature, CHECK_NULL);
2173     if (args_size > MAX_ARGS_SIZE) {
2174       classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2175       return nullptr;
2176     }
2177   }
2178 
2179   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2180 
2181   // Default values for code and exceptions attribute elements
2182   u2 max_stack = 0;
2183   u2 max_locals = 0;
2184   u4 code_length = 0;
2185   const u1* code_start = nullptr;
2186   u2 exception_table_length = 0;
2187   const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2188   Array<int>* exception_handlers = Universe::the_empty_int_array();
2189   u2 checked_exceptions_length = 0;
2190   const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2191   CompressedLineNumberWriteStream* linenumber_table = nullptr;
2192   int linenumber_table_length = 0;
2193   int total_lvt_length = 0;
2194   u2 lvt_cnt = 0;
2195   u2 lvtt_cnt = 0;
2196   bool lvt_allocated = false;
2197   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2198   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2199   u2* localvariable_table_length = nullptr;
2200   const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2201   u2* localvariable_type_table_length = nullptr;
2202   const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2203   int method_parameters_length = -1;
2204   const u1* method_parameters_data = nullptr;
2205   bool method_parameters_seen = false;
2206   bool parsed_code_attribute = false;
2207   bool parsed_checked_exceptions_attribute = false;
2208   bool parsed_stackmap_attribute = false;
2209   // stackmap attribute - JDK1.5
2210   const u1* stackmap_data = nullptr;
2211   int stackmap_data_length = 0;
2212   u2 generic_signature_index = 0;
2213   MethodAnnotationCollector parsed_annotations;
2214   const u1* runtime_visible_annotations = nullptr;
2215   int runtime_visible_annotations_length = 0;
2216   const u1* runtime_visible_parameter_annotations = nullptr;
2217   int runtime_visible_parameter_annotations_length = 0;
2218   const u1* runtime_visible_type_annotations = nullptr;
2219   int runtime_visible_type_annotations_length = 0;
2220   bool runtime_invisible_annotations_exists = false;
2221   bool runtime_invisible_type_annotations_exists = false;
2222   bool runtime_invisible_parameter_annotations_exists = false;
2223   const u1* annotation_default = nullptr;
2224   int annotation_default_length = 0;
2225 
2226   // Parse code and exceptions attribute
2227   u2 method_attributes_count = cfs->get_u2_fast();
2228   while (method_attributes_count--) {
2229     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2230     const u2 method_attribute_name_index = cfs->get_u2_fast();
2231     const u4 method_attribute_length = cfs->get_u4_fast();
2232     guarantee_property(
2233       valid_symbol_at(method_attribute_name_index),
2234       "Invalid method attribute name index %u in class file %s",
2235       method_attribute_name_index, CHECK_NULL);
2236 
2237     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2238     if (method_attribute_name == vmSymbols::tag_code()) {
2239       // Parse Code attribute
2240       if (_need_verify) {
2241         guarantee_property(
2242             !access_flags.is_native() && !access_flags.is_abstract(),
2243                         "Code attribute in native or abstract methods in class file %s",
2244                          CHECK_NULL);
2245       }
2246       if (parsed_code_attribute) {
2247         classfile_parse_error("Multiple Code attributes in class file %s",
2248                               THREAD);
2249         return nullptr;
2250       }
2251       parsed_code_attribute = true;
2252 
2253       // Stack size, locals size, and code size
2254       cfs->guarantee_more(8, CHECK_NULL);
2255       max_stack = cfs->get_u2_fast();
2256       max_locals = cfs->get_u2_fast();
2257       code_length = cfs->get_u4_fast();
2258       if (_need_verify) {
2259         guarantee_property(args_size <= max_locals,
2260                            "Arguments can't fit into locals in class file %s",
2261                            CHECK_NULL);
2262         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2263                            "Invalid method Code length %u in class file %s",
2264                            code_length, CHECK_NULL);
2265       }
2266       // Code pointer
2267       code_start = cfs->current();
2268       assert(code_start != nullptr, "null code start");
2269       cfs->guarantee_more(code_length, CHECK_NULL);
2270       cfs->skip_u1_fast(code_length);
2271 
2272       // Exception handler table
2273       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2274       exception_table_length = cfs->get_u2_fast();
2275       if (exception_table_length > 0) {
2276         exception_table_start = parse_exception_table(cfs,
2277                                                       code_length,
2278                                                       exception_table_length,
2279                                                       CHECK_NULL);
2280       }
2281 
2282       // Parse additional attributes in code attribute
2283       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2284       u2 code_attributes_count = cfs->get_u2_fast();
2285 
2286       unsigned int calculated_attribute_length = 0;
2287 
2288       calculated_attribute_length =
2289           sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2290       calculated_attribute_length += checked_cast<unsigned int>(
2291         code_length +
2292         sizeof(exception_table_length) +
2293         sizeof(code_attributes_count) +
2294         exception_table_length *
2295             ( sizeof(u2) +   // start_pc
2296               sizeof(u2) +   // end_pc
2297               sizeof(u2) +   // handler_pc
2298               sizeof(u2) )); // catch_type_index
2299 
2300       while (code_attributes_count--) {
2301         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2302         const u2 code_attribute_name_index = cfs->get_u2_fast();
2303         const u4 code_attribute_length = cfs->get_u4_fast();
2304         calculated_attribute_length += code_attribute_length +
2305                                        (unsigned)sizeof(code_attribute_name_index) +
2306                                        (unsigned)sizeof(code_attribute_length);
2307         guarantee_property(valid_symbol_at(code_attribute_name_index),
2308                            "Invalid code attribute name index %u in class file %s",
2309                            code_attribute_name_index,
2310                            CHECK_NULL);
2311         if (LoadLineNumberTables &&
2312             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2313           // Parse and compress line number table
2314           parse_linenumber_table(code_attribute_length,
2315                                  code_length,
2316                                  &linenumber_table,
2317                                  CHECK_NULL);
2318 
2319         } else if (LoadLocalVariableTables &&
2320                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2321           // Parse local variable table
2322           if (!lvt_allocated) {
2323             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2324               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2325             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2326               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2327             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2328               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2329             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2330               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2331             lvt_allocated = true;
2332           }
2333           if (lvt_cnt == max_lvt_cnt) {
2334             max_lvt_cnt <<= 1;
2335             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2336             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2337           }
2338           localvariable_table_start[lvt_cnt] =
2339             parse_localvariable_table(cfs,
2340                                       code_length,
2341                                       max_locals,
2342                                       code_attribute_length,
2343                                       &localvariable_table_length[lvt_cnt],
2344                                       false,    // is not LVTT
2345                                       CHECK_NULL);
2346           total_lvt_length += localvariable_table_length[lvt_cnt];
2347           lvt_cnt++;
2348         } else if (LoadLocalVariableTypeTables &&
2349                    _major_version >= JAVA_1_5_VERSION &&
2350                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2351           if (!lvt_allocated) {
2352             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2353               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2354             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2355               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2356             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2357               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2358             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2359               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2360             lvt_allocated = true;
2361           }
2362           // Parse local variable type table
2363           if (lvtt_cnt == max_lvtt_cnt) {
2364             max_lvtt_cnt <<= 1;
2365             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2366             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2367           }
2368           localvariable_type_table_start[lvtt_cnt] =
2369             parse_localvariable_table(cfs,
2370                                       code_length,
2371                                       max_locals,
2372                                       code_attribute_length,
2373                                       &localvariable_type_table_length[lvtt_cnt],
2374                                       true,     // is LVTT
2375                                       CHECK_NULL);
2376           lvtt_cnt++;
2377         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2378                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2379           // Stack map is only needed by the new verifier in JDK1.5.
2380           if (parsed_stackmap_attribute) {
2381             classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2382             return nullptr;
2383           }
2384           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2385           stackmap_data_length = code_attribute_length;
2386           parsed_stackmap_attribute = true;
2387         } else {
2388           // Skip unknown attributes
2389           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2390         }
2391       }
2392       // check method attribute length
2393       if (_need_verify) {
2394         guarantee_property(method_attribute_length == calculated_attribute_length,
2395                            "Code segment has wrong length in class file %s",
2396                            CHECK_NULL);
2397       }
2398     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2399       // Parse Exceptions attribute
2400       if (parsed_checked_exceptions_attribute) {
2401         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2402                               THREAD);
2403         return nullptr;
2404       }
2405       parsed_checked_exceptions_attribute = true;
2406       checked_exceptions_start =
2407             parse_checked_exceptions(cfs,
2408                                      &checked_exceptions_length,
2409                                      method_attribute_length,
2410                                      CHECK_NULL);
2411     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2412       // reject multiple method parameters
2413       if (method_parameters_seen) {
2414         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2415                               THREAD);
2416         return nullptr;
2417       }
2418       method_parameters_seen = true;
2419       method_parameters_length = cfs->get_u1_fast();
2420       const u4 real_length = (method_parameters_length * 4u) + 1u;
2421       if (method_attribute_length != real_length) {
2422         classfile_parse_error(
2423           "Invalid MethodParameters method attribute length %u in class file",
2424           method_attribute_length, THREAD);
2425         return nullptr;
2426       }
2427       method_parameters_data = cfs->current();
2428       cfs->skip_u2_fast(method_parameters_length);
2429       cfs->skip_u2_fast(method_parameters_length);
2430       // ignore this attribute if it cannot be reflected
2431       if (!vmClasses::Parameter_klass_loaded())
2432         method_parameters_length = -1;
2433     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2434       if (method_attribute_length != 0) {
2435         classfile_parse_error(
2436           "Invalid Synthetic method attribute length %u in class file %s",
2437           method_attribute_length, THREAD);
2438         return nullptr;
2439       }
2440       // Should we check that there hasn't already been a synthetic attribute?
2441       access_flags.set_is_synthetic();
2442     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2443       if (method_attribute_length != 0) {
2444         classfile_parse_error(
2445           "Invalid Deprecated method attribute length %u in class file %s",
2446           method_attribute_length, THREAD);
2447         return nullptr;
2448       }
2449     } else if (_major_version >= JAVA_1_5_VERSION) {
2450       if (method_attribute_name == vmSymbols::tag_signature()) {
2451         if (generic_signature_index != 0) {
2452           classfile_parse_error(
2453             "Multiple Signature attributes for method in class file %s",
2454             THREAD);
2455           return nullptr;
2456         }
2457         if (method_attribute_length != 2) {
2458           classfile_parse_error(
2459             "Invalid Signature attribute length %u in class file %s",
2460             method_attribute_length, THREAD);
2461           return nullptr;
2462         }
2463         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2464       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2465         if (runtime_visible_annotations != nullptr) {
2466           classfile_parse_error(
2467             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2468             THREAD);
2469           return nullptr;
2470         }
2471         runtime_visible_annotations_length = method_attribute_length;
2472         runtime_visible_annotations = cfs->current();
2473         assert(runtime_visible_annotations != nullptr, "null visible annotations");
2474         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2475         parse_annotations(cp,
2476                           runtime_visible_annotations,
2477                           runtime_visible_annotations_length,
2478                           &parsed_annotations,
2479                           _loader_data,
2480                           _can_access_vm_annotations);
2481         cfs->skip_u1_fast(runtime_visible_annotations_length);
2482       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2483         if (runtime_invisible_annotations_exists) {
2484           classfile_parse_error(
2485             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2486             THREAD);
2487           return nullptr;
2488         }
2489         runtime_invisible_annotations_exists = true;
2490         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2491       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2492         if (runtime_visible_parameter_annotations != nullptr) {
2493           classfile_parse_error(
2494             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2495             THREAD);
2496           return nullptr;
2497         }
2498         runtime_visible_parameter_annotations_length = method_attribute_length;
2499         runtime_visible_parameter_annotations = cfs->current();
2500         assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2501         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2502       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2503         if (runtime_invisible_parameter_annotations_exists) {
2504           classfile_parse_error(
2505             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2506             THREAD);
2507           return nullptr;
2508         }
2509         runtime_invisible_parameter_annotations_exists = true;
2510         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2511       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2512         if (annotation_default != nullptr) {
2513           classfile_parse_error(
2514             "Multiple AnnotationDefault attributes for method in class file %s",
2515             THREAD);
2516           return nullptr;
2517         }
2518         annotation_default_length = method_attribute_length;
2519         annotation_default = cfs->current();
2520         assert(annotation_default != nullptr, "null annotation default");
2521         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2522       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2523         if (runtime_visible_type_annotations != nullptr) {
2524           classfile_parse_error(
2525             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2526             THREAD);
2527           return nullptr;
2528         }
2529         runtime_visible_type_annotations_length = method_attribute_length;
2530         runtime_visible_type_annotations = cfs->current();
2531         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2532         // No need for the VM to parse Type annotations
2533         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2534       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2535         if (runtime_invisible_type_annotations_exists) {
2536           classfile_parse_error(
2537             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2538             THREAD);
2539           return nullptr;
2540         }
2541         runtime_invisible_type_annotations_exists = true;
2542         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2543       } else {
2544         // Skip unknown attributes
2545         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2546       }
2547     } else {
2548       // Skip unknown attributes
2549       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2550     }
2551   }
2552 
2553   if (linenumber_table != nullptr) {
2554     linenumber_table->write_terminator();
2555     linenumber_table_length = linenumber_table->position();
2556   }
2557 
2558   // Make sure there's at least one Code attribute in non-native/non-abstract method
2559   if (_need_verify) {
2560     guarantee_property(access_flags.is_native() ||
2561                        access_flags.is_abstract() ||
2562                        parsed_code_attribute,
2563                        "Absent Code attribute in method that is not native or abstract in class file %s",
2564                        CHECK_NULL);
2565   }
2566 
2567   // All sizing information for a Method* is finally available, now create it
2568   InlineTableSizes sizes(
2569       total_lvt_length,
2570       linenumber_table_length,
2571       exception_table_length,
2572       checked_exceptions_length,
2573       method_parameters_length,
2574       generic_signature_index,
2575       runtime_visible_annotations_length,
2576       runtime_visible_parameter_annotations_length,
2577       runtime_visible_type_annotations_length,
2578       annotation_default_length,
2579       0);
2580 
2581   Method* const m = Method::allocate(_loader_data,
2582                                      code_length,
2583                                      access_flags,
2584                                      &sizes,
2585                                      ConstMethod::NORMAL,
2586                                      _cp->symbol_at(name_index),
2587                                      CHECK_NULL);
2588 
2589   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2590 
2591   // Fill in information from fixed part (access_flags already set)
2592   m->set_constants(_cp);
2593   m->set_name_index(name_index);
2594   m->set_signature_index(signature_index);
2595   m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2596   assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2597 
2598   // Fill in code attribute information
2599   m->set_max_stack(max_stack);
2600   m->set_max_locals(max_locals);
2601   if (stackmap_data != nullptr) {
2602     m->constMethod()->copy_stackmap_data(_loader_data,
2603                                          (u1*)stackmap_data,
2604                                          stackmap_data_length,
2605                                          CHECK_NULL);
2606   }
2607 
2608   // Copy byte codes
2609   m->set_code((u1*)code_start);
2610 
2611   // Copy line number table
2612   if (linenumber_table != nullptr) {
2613     memcpy(m->compressed_linenumber_table(),
2614            linenumber_table->buffer(),
2615            linenumber_table_length);
2616   }
2617 
2618   // Copy exception table
2619   if (exception_table_length > 0) {
2620     Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2621                                                 m->exception_table_start(),
2622                                                 exception_table_length * sizeof(ExceptionTableElement),
2623                                                 sizeof(u2));
2624   }
2625 
2626   // Copy method parameters
2627   if (method_parameters_length > 0) {
2628     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2629     for (int i = 0; i < method_parameters_length; i++) {
2630       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2631       method_parameters_data += 2;
2632       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2633       method_parameters_data += 2;
2634     }
2635   }
2636 
2637   // Copy checked exceptions
2638   if (checked_exceptions_length > 0) {
2639     Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2640                                                 m->checked_exceptions_start(),
2641                                                 checked_exceptions_length * sizeof(CheckedExceptionElement),
2642                                                 sizeof(u2));
2643   }
2644 
2645   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2646   if (total_lvt_length > 0) {
2647     *has_localvariable_table = true;
2648     copy_localvariable_table(m->constMethod(),
2649                              lvt_cnt,
2650                              localvariable_table_length,
2651                              localvariable_table_start,
2652                              lvtt_cnt,
2653                              localvariable_type_table_length,
2654                              localvariable_type_table_start,
2655                              CHECK_NULL);
2656   }
2657 
2658   if (parsed_annotations.has_any_annotations())
2659     parsed_annotations.apply_to(methodHandle(THREAD, m));
2660 
2661   if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2662     m->set_is_hidden();
2663   }
2664 
2665   // Copy annotations
2666   copy_method_annotations(m->constMethod(),
2667                           runtime_visible_annotations,
2668                           runtime_visible_annotations_length,
2669                           runtime_visible_parameter_annotations,
2670                           runtime_visible_parameter_annotations_length,
2671                           runtime_visible_type_annotations,
2672                           runtime_visible_type_annotations_length,
2673                           annotation_default,
2674                           annotation_default_length,
2675                           CHECK_NULL);
2676 
2677   if (InstanceKlass::is_finalization_enabled() &&
2678       name == vmSymbols::finalize_method_name() &&
2679       signature == vmSymbols::void_method_signature()) {
2680     if (m->is_empty_method()) {
2681       _has_empty_finalizer = true;
2682     } else {
2683       _has_finalizer = true;
2684     }
2685   }
2686 
2687   NOT_PRODUCT(m->verify());
2688   return m;
2689 }
2690 
2691 
2692 // Side-effects: populates the _methods field in the parser
2693 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2694                                     bool is_interface,
2695                                     bool* const has_localvariable_table,
2696                                     bool* has_final_method,
2697                                     bool* declares_nonstatic_concrete_methods,
2698                                     TRAPS) {
2699   assert(cfs != nullptr, "invariant");
2700   assert(has_localvariable_table != nullptr, "invariant");
2701   assert(has_final_method != nullptr, "invariant");
2702   assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2703 
2704   assert(nullptr == _methods, "invariant");
2705 
2706   cfs->guarantee_more(2, CHECK);  // length
2707   const u2 length = cfs->get_u2_fast();
2708   if (length == 0) {
2709     _methods = Universe::the_empty_method_array();
2710   } else {
2711     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2712                                                    length,
2713                                                    nullptr,
2714                                                    CHECK);
2715 
2716     for (int index = 0; index < length; index++) {
2717       Method* method = parse_method(cfs,
2718                                     is_interface,
2719                                     _cp,
2720                                     has_localvariable_table,
2721                                     CHECK);
2722 
2723       if (method->is_final()) {
2724         *has_final_method = true;
2725       }
2726       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2727       // used for interface initialization, and default method inheritance analysis
2728       if (is_interface && !(*declares_nonstatic_concrete_methods)
2729         && !method->is_abstract() && !method->is_static()) {
2730         *declares_nonstatic_concrete_methods = true;
2731       }
2732       _methods->at_put(index, method);
2733     }
2734 
2735     if (_need_verify && length > 1) {
2736       // Check duplicated methods
2737       ResourceMark rm(THREAD);
2738       // Set containing name-signature pairs
2739       NameSigHashtable* names_and_sigs = new NameSigHashtable();
2740       for (int i = 0; i < length; i++) {
2741         const Method* const m = _methods->at(i);
2742         NameSigHash name_and_sig(m->name(), m->signature());
2743         // If no duplicates, add name/signature in hashtable names_and_sigs.
2744         if(!names_and_sigs->put(name_and_sig, 0)) {
2745           classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2746                                  name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2747           return;
2748         }
2749       }
2750     }
2751   }
2752 }
2753 
2754 static const intArray* sort_methods(Array<Method*>* methods) {
2755   const int length = methods->length();
2756   // If JVMTI original method ordering or sharing is enabled we have to
2757   // remember the original class file ordering.
2758   // We temporarily use the vtable_index field in the Method* to store the
2759   // class file index, so we can read in after calling qsort.
2760   // Put the method ordering in the shared archive.
2761   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2762     for (int index = 0; index < length; index++) {
2763       Method* const m = methods->at(index);
2764       assert(!m->valid_vtable_index(), "vtable index should not be set");
2765       m->set_vtable_index(index);
2766     }
2767   }
2768   // Sort method array by ascending method name (for faster lookups & vtable construction)
2769   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2770   Method::sort_methods(methods);
2771 
2772   intArray* method_ordering = nullptr;
2773   // If JVMTI original method ordering or sharing is enabled construct int
2774   // array remembering the original ordering
2775   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2776     method_ordering = new intArray(length, length, -1);
2777     for (int index = 0; index < length; index++) {
2778       Method* const m = methods->at(index);
2779       const int old_index = m->vtable_index();
2780       assert(old_index >= 0 && old_index < length, "invalid method index");
2781       method_ordering->at_put(index, old_index);
2782       m->set_vtable_index(Method::invalid_vtable_index);
2783     }
2784   }
2785   return method_ordering;
2786 }
2787 
2788 // Parse generic_signature attribute for methods and fields
2789 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2790                                                       TRAPS) {
2791   assert(cfs != nullptr, "invariant");
2792 
2793   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2794   const u2 generic_signature_index = cfs->get_u2_fast();
2795   guarantee_property(
2796     valid_symbol_at(generic_signature_index),
2797     "Invalid Signature attribute at constant pool index %u in class file %s",
2798     generic_signature_index, CHECK_0);
2799   return generic_signature_index;
2800 }
2801 
2802 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2803                                                            TRAPS) {
2804 
2805   assert(cfs != nullptr, "invariant");
2806 
2807   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2808   const u2 sourcefile_index = cfs->get_u2_fast();
2809   guarantee_property(
2810     valid_symbol_at(sourcefile_index),
2811     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2812     sourcefile_index, CHECK);
2813   set_class_sourcefile_index(sourcefile_index);
2814 }
2815 
2816 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2817                                                                        int length,
2818                                                                        TRAPS) {
2819   assert(cfs != nullptr, "invariant");
2820 
2821   const u1* const sde_buffer = cfs->current();
2822   assert(sde_buffer != nullptr, "null sde buffer");
2823 
2824   // Don't bother storing it if there is no way to retrieve it
2825   if (JvmtiExport::can_get_source_debug_extension()) {
2826     assert((length+1) > length, "Overflow checking");
2827     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2828     for (int i = 0; i < length; i++) {
2829       sde[i] = sde_buffer[i];
2830     }
2831     sde[length] = '\0';
2832     set_class_sde_buffer((const char*)sde, length);
2833   }
2834   // Got utf8 string, set stream position forward
2835   cfs->skip_u1(length, CHECK);
2836 }
2837 
2838 
2839 // Inner classes can be static, private or protected (classic VM does this)
2840 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2841                                            JVM_ACC_PRIVATE |                \
2842                                            JVM_ACC_PROTECTED |              \
2843                                            JVM_ACC_STATIC                   \
2844                                          )
2845 
2846 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2847 // Return -1 if none is found.
2848 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2849   Symbol* cp_klass_name =  cp->klass_name_at(inner);
2850   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2851     int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2852     if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2853       return idx;
2854     }
2855   }
2856   return -1;
2857 }
2858 
2859 // Return the outer_class_info_index for the InnerClasses entry containing the
2860 // specified inner_class_info_index.  Return -1 if no InnerClasses entry is found.
2861 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2862   if (inner == 0) return -1;
2863   int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2864   if (idx == -1) return -1;
2865   int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2866   return result;
2867 }
2868 
2869 // Return true if circularity is found, false if no circularity is found.
2870 // Use Floyd's cycle finding algorithm.
2871 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2872   int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2873   int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2874 
2875   while (fast != -1 && fast != 0) {
2876     if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2877       return true;  // found a circularity
2878     }
2879     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2880     if (fast == -1) return false;
2881     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2882     if (fast == -1) return false;
2883     slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2884     assert(slow != -1, "sanity check");
2885   }
2886   return false;
2887 }
2888 
2889 // Loop through each InnerClasses entry checking for circularities and duplications
2890 // with other entries.  If duplicate entries are found then throw CFE.  Otherwise,
2891 // return true if a circularity or entries with duplicate inner_class_info_indexes
2892 // are found.
2893 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2894   // Loop through each InnerClasses entry.
2895   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2896     // Return true if there are circular entries.
2897     if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2898       return true;
2899     }
2900     // Check if there are duplicate entries or entries with the same inner_class_info_index.
2901     for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2902          y += InstanceKlass::inner_class_next_offset) {
2903 
2904       // 4347400: make sure there's no duplicate entry in the classes array
2905       if (_major_version >= JAVA_1_5_VERSION) {
2906         guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2907                             _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2908                             _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2909                             _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2910                            "Duplicate entry in InnerClasses attribute in class file %s",
2911                            CHECK_(true));
2912       }
2913       // Return true if there are two entries with the same inner_class_info_index.
2914       if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2915         return true;
2916       }
2917     }
2918   }
2919   return false;
2920 }
2921 
2922 // Return number of classes in the inner classes attribute table
2923 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
2924                                                             const ConstantPool* cp,
2925                                                             const u1* const inner_classes_attribute_start,
2926                                                             bool parsed_enclosingmethod_attribute,
2927                                                             u2 enclosing_method_class_index,
2928                                                             u2 enclosing_method_method_index,
2929                                                             TRAPS) {
2930   const u1* const current_mark = cfs->current();
2931   u2 length = 0;
2932   if (inner_classes_attribute_start != nullptr) {
2933     cfs->set_current(inner_classes_attribute_start);
2934     cfs->guarantee_more(2, CHECK_0);  // length
2935     length = cfs->get_u2_fast();
2936   }
2937 
2938   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2939   // method data:
2940   //   [inner_class_info_index,
2941   //    outer_class_info_index,
2942   //    inner_name_index,
2943   //    inner_class_access_flags,
2944   //    ...
2945   //    enclosing_method_class_index,
2946   //    enclosing_method_method_index]
2947   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2948   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2949   _inner_classes = inner_classes;
2950 
2951   int index = 0;
2952   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
2953   for (int n = 0; n < length; n++) {
2954     // Inner class index
2955     const u2 inner_class_info_index = cfs->get_u2_fast();
2956     guarantee_property(
2957       valid_klass_reference_at(inner_class_info_index),
2958       "inner_class_info_index %u has bad constant type in class file %s",
2959       inner_class_info_index, CHECK_0);
2960     // Outer class index
2961     const u2 outer_class_info_index = cfs->get_u2_fast();
2962     guarantee_property(
2963       outer_class_info_index == 0 ||
2964         valid_klass_reference_at(outer_class_info_index),
2965       "outer_class_info_index %u has bad constant type in class file %s",
2966       outer_class_info_index, CHECK_0);
2967 
2968     if (outer_class_info_index != 0) {
2969       const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
2970       char* bytes = (char*)outer_class_name->bytes();
2971       guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
2972                          "Outer class is an array class in class file %s", CHECK_0);
2973     }
2974     // Inner class name
2975     const u2 inner_name_index = cfs->get_u2_fast();
2976     guarantee_property(
2977       inner_name_index == 0 || valid_symbol_at(inner_name_index),
2978       "inner_name_index %u has bad constant type in class file %s",
2979       inner_name_index, CHECK_0);
2980     if (_need_verify) {
2981       guarantee_property(inner_class_info_index != outer_class_info_index,
2982                          "Class is both outer and inner class in class file %s", CHECK_0);
2983     }
2984     // Access flags
2985     u2 flags;
2986     // JVM_ACC_MODULE is defined in JDK-9 and later.
2987     if (_major_version >= JAVA_9_VERSION) {
2988       flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
2989     } else {
2990       flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2991     }
2992     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2993       // Set abstract bit for old class files for backward compatibility
2994       flags |= JVM_ACC_ABSTRACT;
2995     }
2996     verify_legal_class_modifiers(flags, CHECK_0);
2997     AccessFlags inner_access_flags(flags);
2998 
2999     inner_classes->at_put(index++, inner_class_info_index);
3000     inner_classes->at_put(index++, outer_class_info_index);
3001     inner_classes->at_put(index++, inner_name_index);
3002     inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3003   }
3004 
3005   // Check for circular and duplicate entries.
3006   bool has_circularity = false;
3007   if (_need_verify) {
3008     has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3009     if (has_circularity) {
3010       // If circularity check failed then ignore InnerClasses attribute.
3011       MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3012       index = 0;
3013       if (parsed_enclosingmethod_attribute) {
3014         inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3015         _inner_classes = inner_classes;
3016       } else {
3017         _inner_classes = Universe::the_empty_short_array();
3018       }
3019     }
3020   }
3021   // Set EnclosingMethod class and method indexes.
3022   if (parsed_enclosingmethod_attribute) {
3023     inner_classes->at_put(index++, enclosing_method_class_index);
3024     inner_classes->at_put(index++, enclosing_method_method_index);
3025   }
3026   assert(index == size || has_circularity, "wrong size");
3027 
3028   // Restore buffer's current position.
3029   cfs->set_current(current_mark);
3030 
3031   return length;
3032 }
3033 
3034 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3035                                                            const u1* const nest_members_attribute_start,
3036                                                            TRAPS) {
3037   const u1* const current_mark = cfs->current();
3038   u2 length = 0;
3039   if (nest_members_attribute_start != nullptr) {
3040     cfs->set_current(nest_members_attribute_start);
3041     cfs->guarantee_more(2, CHECK_0);  // length
3042     length = cfs->get_u2_fast();
3043   }
3044   const int size = length;
3045   Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3046   _nest_members = nest_members;
3047 
3048   int index = 0;
3049   cfs->guarantee_more(2 * length, CHECK_0);
3050   for (int n = 0; n < length; n++) {
3051     const u2 class_info_index = cfs->get_u2_fast();
3052     guarantee_property(
3053       valid_klass_reference_at(class_info_index),
3054       "Nest member class_info_index %u has bad constant type in class file %s",
3055       class_info_index, CHECK_0);
3056     nest_members->at_put(index++, class_info_index);
3057   }
3058   assert(index == size, "wrong size");
3059 
3060   // Restore buffer's current position.
3061   cfs->set_current(current_mark);
3062 
3063   return length;
3064 }
3065 
3066 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3067                                                                    const u1* const permitted_subclasses_attribute_start,
3068                                                                    TRAPS) {
3069   const u1* const current_mark = cfs->current();
3070   u2 length = 0;
3071   if (permitted_subclasses_attribute_start != nullptr) {
3072     cfs->set_current(permitted_subclasses_attribute_start);
3073     cfs->guarantee_more(2, CHECK_0);  // length
3074     length = cfs->get_u2_fast();
3075   }
3076   const int size = length;
3077   Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3078   _permitted_subclasses = permitted_subclasses;
3079 
3080   if (length > 0) {
3081     int index = 0;
3082     cfs->guarantee_more(2 * length, CHECK_0);
3083     for (int n = 0; n < length; n++) {
3084       const u2 class_info_index = cfs->get_u2_fast();
3085       guarantee_property(
3086         valid_klass_reference_at(class_info_index),
3087         "Permitted subclass class_info_index %u has bad constant type in class file %s",
3088         class_info_index, CHECK_0);
3089       permitted_subclasses->at_put(index++, class_info_index);
3090     }
3091     assert(index == size, "wrong size");
3092   }
3093 
3094   // Restore buffer's current position.
3095   cfs->set_current(current_mark);
3096 
3097   return length;
3098 }
3099 
3100 //  Record {
3101 //    u2 attribute_name_index;
3102 //    u4 attribute_length;
3103 //    u2 components_count;
3104 //    component_info components[components_count];
3105 //  }
3106 //  component_info {
3107 //    u2 name_index;
3108 //    u2 descriptor_index
3109 //    u2 attributes_count;
3110 //    attribute_info_attributes[attributes_count];
3111 //  }
3112 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3113                                                      const ConstantPool* cp,
3114                                                      const u1* const record_attribute_start,
3115                                                      TRAPS) {
3116   const u1* const current_mark = cfs->current();
3117   int components_count = 0;
3118   unsigned int calculate_attr_size = 0;
3119   if (record_attribute_start != nullptr) {
3120     cfs->set_current(record_attribute_start);
3121     cfs->guarantee_more(2, CHECK_0);  // num of components
3122     components_count = (int)cfs->get_u2_fast();
3123     calculate_attr_size = 2;
3124   }
3125 
3126   Array<RecordComponent*>* const record_components =
3127     MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3128   _record_components = record_components;
3129 
3130   for (int x = 0; x < components_count; x++) {
3131     cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3132 
3133     const u2 name_index = cfs->get_u2_fast();
3134     guarantee_property(valid_symbol_at(name_index),
3135       "Invalid constant pool index %u for name in Record attribute in class file %s",
3136       name_index, CHECK_0);
3137     const Symbol* const name = cp->symbol_at(name_index);
3138     verify_legal_field_name(name, CHECK_0);
3139 
3140     const u2 descriptor_index = cfs->get_u2_fast();
3141     guarantee_property(valid_symbol_at(descriptor_index),
3142       "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3143       descriptor_index, CHECK_0);
3144     const Symbol* const descr = cp->symbol_at(descriptor_index);
3145     verify_legal_field_signature(name, descr, CHECK_0);
3146 
3147     const u2 attributes_count = cfs->get_u2_fast();
3148     calculate_attr_size += 6;
3149     u2 generic_sig_index = 0;
3150     const u1* runtime_visible_annotations = nullptr;
3151     int runtime_visible_annotations_length = 0;
3152     bool runtime_invisible_annotations_exists = false;
3153     const u1* runtime_visible_type_annotations = nullptr;
3154     int runtime_visible_type_annotations_length = 0;
3155     bool runtime_invisible_type_annotations_exists = false;
3156 
3157     // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3158     // and Runtime(In)VisibleTypeAnnotations.  Other attributes are ignored.
3159     for (int y = 0; y < attributes_count; y++) {
3160       cfs->guarantee_more(6, CHECK_0);  // attribute_name_index, attribute_length
3161       const u2 attribute_name_index = cfs->get_u2_fast();
3162       const u4 attribute_length = cfs->get_u4_fast();
3163       calculate_attr_size += 6;
3164       guarantee_property(
3165         valid_symbol_at(attribute_name_index),
3166         "Invalid Record attribute name index %u in class file %s",
3167         attribute_name_index, CHECK_0);
3168 
3169       const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3170       if (attribute_name == vmSymbols::tag_signature()) {
3171         if (generic_sig_index != 0) {
3172           classfile_parse_error(
3173             "Multiple Signature attributes for Record component in class file %s",
3174             THREAD);
3175           return 0;
3176         }
3177         if (attribute_length != 2) {
3178           classfile_parse_error(
3179             "Invalid Signature attribute length %u in Record component in class file %s",
3180             attribute_length, THREAD);
3181           return 0;
3182         }
3183         generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3184 
3185       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3186         if (runtime_visible_annotations != nullptr) {
3187           classfile_parse_error(
3188             "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3189           return 0;
3190         }
3191         runtime_visible_annotations_length = attribute_length;
3192         runtime_visible_annotations = cfs->current();
3193 
3194         assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3195         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3196         cfs->skip_u1_fast(runtime_visible_annotations_length);
3197 
3198       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3199         if (runtime_invisible_annotations_exists) {
3200           classfile_parse_error(
3201             "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3202           return 0;
3203         }
3204         runtime_invisible_annotations_exists = true;
3205         cfs->skip_u1(attribute_length, CHECK_0);
3206 
3207       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3208         if (runtime_visible_type_annotations != nullptr) {
3209           classfile_parse_error(
3210             "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3211           return 0;
3212         }
3213         runtime_visible_type_annotations_length = attribute_length;
3214         runtime_visible_type_annotations = cfs->current();
3215 
3216         assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3217         cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3218         cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3219 
3220       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3221         if (runtime_invisible_type_annotations_exists) {
3222           classfile_parse_error(
3223             "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3224           return 0;
3225         }
3226         runtime_invisible_type_annotations_exists = true;
3227         cfs->skip_u1(attribute_length, CHECK_0);
3228 
3229       } else {
3230         // Skip unknown attributes
3231         cfs->skip_u1(attribute_length, CHECK_0);
3232       }
3233       calculate_attr_size += attribute_length;
3234     } // End of attributes For loop
3235 
3236     AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3237                                                         runtime_visible_annotations_length,
3238                                                         CHECK_0);
3239     AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3240                                                              runtime_visible_type_annotations_length,
3241                                                              CHECK_0);
3242 
3243     RecordComponent* record_component =
3244       RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3245                                 annotations, type_annotations, CHECK_0);
3246     record_components->at_put(x, record_component);
3247   }  // End of component processing loop
3248 
3249   // Restore buffer's current position.
3250   cfs->set_current(current_mark);
3251   return calculate_attr_size;
3252 }
3253 
3254 void ClassFileParser::parse_classfile_synthetic_attribute() {
3255   set_class_synthetic_flag(true);
3256 }
3257 
3258 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3259   assert(cfs != nullptr, "invariant");
3260 
3261   const u2 signature_index = cfs->get_u2(CHECK);
3262   guarantee_property(
3263     valid_symbol_at(signature_index),
3264     "Invalid constant pool index %u in Signature attribute in class file %s",
3265     signature_index, CHECK);
3266   set_class_generic_signature_index(signature_index);
3267 }
3268 
3269 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3270                                                                   ConstantPool* cp,
3271                                                                   u4 attribute_byte_length,
3272                                                                   TRAPS) {
3273   assert(cfs != nullptr, "invariant");
3274   assert(cp != nullptr, "invariant");
3275 
3276   const u1* const current_start = cfs->current();
3277 
3278   guarantee_property(attribute_byte_length >= sizeof(u2),
3279                      "Invalid BootstrapMethods attribute length %u in class file %s",
3280                      attribute_byte_length,
3281                      CHECK);
3282 
3283   cfs->guarantee_more(attribute_byte_length, CHECK);
3284 
3285   const int attribute_array_length = cfs->get_u2_fast();
3286 
3287   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3288                      "Short length on BootstrapMethods in class file %s",
3289                      CHECK);
3290 
3291 
3292   // The attribute contains a counted array of counted tuples of shorts,
3293   // represending bootstrap specifiers:
3294   //    length*{bootstrap_method_index, argument_count*{argument_index}}
3295   const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3296   // operand_count = number of shorts in attr, except for leading length
3297 
3298   // The attribute is copied into a short[] array.
3299   // The array begins with a series of short[2] pairs, one for each tuple.
3300   const int index_size = (attribute_array_length * 2);
3301 
3302   Array<u2>* const operands =
3303     MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3304 
3305   // Eagerly assign operands so they will be deallocated with the constant
3306   // pool if there is an error.
3307   cp->set_operands(operands);
3308 
3309   int operand_fill_index = index_size;
3310   const int cp_size = cp->length();
3311 
3312   for (int n = 0; n < attribute_array_length; n++) {
3313     // Store a 32-bit offset into the header of the operand array.
3314     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3315 
3316     // Read a bootstrap specifier.
3317     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3318     const u2 bootstrap_method_index = cfs->get_u2_fast();
3319     const u2 argument_count = cfs->get_u2_fast();
3320     guarantee_property(
3321       valid_cp_range(bootstrap_method_index, cp_size) &&
3322       cp->tag_at(bootstrap_method_index).is_method_handle(),
3323       "bootstrap_method_index %u has bad constant type in class file %s",
3324       bootstrap_method_index,
3325       CHECK);
3326 
3327     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3328       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3329       CHECK);
3330 
3331     operands->at_put(operand_fill_index++, bootstrap_method_index);
3332     operands->at_put(operand_fill_index++, argument_count);
3333 
3334     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
3335     for (int j = 0; j < argument_count; j++) {
3336       const u2 argument_index = cfs->get_u2_fast();
3337       guarantee_property(
3338         valid_cp_range(argument_index, cp_size) &&
3339         cp->tag_at(argument_index).is_loadable_constant(),
3340         "argument_index %u has bad constant type in class file %s",
3341         argument_index,
3342         CHECK);
3343       operands->at_put(operand_fill_index++, argument_index);
3344     }
3345   }
3346   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3347                      "Bad length on BootstrapMethods in class file %s",
3348                      CHECK);
3349 }
3350 
3351 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3352                                                  ConstantPool* cp,
3353                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3354                                                  TRAPS) {
3355   assert(cfs != nullptr, "invariant");
3356   assert(cp != nullptr, "invariant");
3357   assert(parsed_annotations != nullptr, "invariant");
3358 
3359   // Set inner classes attribute to default sentinel
3360   _inner_classes = Universe::the_empty_short_array();
3361   // Set nest members attribute to default sentinel
3362   _nest_members = Universe::the_empty_short_array();
3363   // Set _permitted_subclasses attribute to default sentinel
3364   _permitted_subclasses = Universe::the_empty_short_array();
3365   cfs->guarantee_more(2, CHECK);  // attributes_count
3366   u2 attributes_count = cfs->get_u2_fast();
3367   bool parsed_sourcefile_attribute = false;
3368   bool parsed_innerclasses_attribute = false;
3369   bool parsed_nest_members_attribute = false;
3370   bool parsed_permitted_subclasses_attribute = false;
3371   bool parsed_nest_host_attribute = false;
3372   bool parsed_record_attribute = false;
3373   bool parsed_enclosingmethod_attribute = false;
3374   bool parsed_bootstrap_methods_attribute = false;
3375   const u1* runtime_visible_annotations = nullptr;
3376   int runtime_visible_annotations_length = 0;
3377   const u1* runtime_visible_type_annotations = nullptr;
3378   int runtime_visible_type_annotations_length = 0;
3379   bool runtime_invisible_type_annotations_exists = false;
3380   bool runtime_invisible_annotations_exists = false;
3381   bool parsed_source_debug_ext_annotations_exist = false;
3382   const u1* inner_classes_attribute_start = nullptr;
3383   u4  inner_classes_attribute_length = 0;
3384   u2  enclosing_method_class_index = 0;
3385   u2  enclosing_method_method_index = 0;
3386   const u1* nest_members_attribute_start = nullptr;
3387   u4  nest_members_attribute_length = 0;
3388   const u1* record_attribute_start = nullptr;
3389   u4  record_attribute_length = 0;
3390   const u1* permitted_subclasses_attribute_start = nullptr;
3391   u4  permitted_subclasses_attribute_length = 0;
3392 
3393   // Iterate over attributes
3394   while (attributes_count--) {
3395     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3396     const u2 attribute_name_index = cfs->get_u2_fast();
3397     const u4 attribute_length = cfs->get_u4_fast();
3398     guarantee_property(
3399       valid_symbol_at(attribute_name_index),
3400       "Attribute name has bad constant pool index %u in class file %s",
3401       attribute_name_index, CHECK);
3402     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3403     if (tag == vmSymbols::tag_source_file()) {
3404       // Check for SourceFile tag
3405       if (_need_verify) {
3406         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3407       }
3408       if (parsed_sourcefile_attribute) {
3409         classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3410         return;
3411       } else {
3412         parsed_sourcefile_attribute = true;
3413       }
3414       parse_classfile_sourcefile_attribute(cfs, CHECK);
3415     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3416       // Check for SourceDebugExtension tag
3417       if (parsed_source_debug_ext_annotations_exist) {
3418         classfile_parse_error(
3419           "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3420         return;
3421       }
3422       parsed_source_debug_ext_annotations_exist = true;
3423       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3424     } else if (tag == vmSymbols::tag_inner_classes()) {
3425       // Check for InnerClasses tag
3426       if (parsed_innerclasses_attribute) {
3427         classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3428         return;
3429       } else {
3430         parsed_innerclasses_attribute = true;
3431       }
3432       inner_classes_attribute_start = cfs->current();
3433       inner_classes_attribute_length = attribute_length;
3434       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3435     } else if (tag == vmSymbols::tag_synthetic()) {
3436       // Check for Synthetic tag
3437       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3438       if (attribute_length != 0) {
3439         classfile_parse_error(
3440           "Invalid Synthetic classfile attribute length %u in class file %s",
3441           attribute_length, THREAD);
3442         return;
3443       }
3444       parse_classfile_synthetic_attribute();
3445     } else if (tag == vmSymbols::tag_deprecated()) {
3446       // Check for Deprecated tag - 4276120
3447       if (attribute_length != 0) {
3448         classfile_parse_error(
3449           "Invalid Deprecated classfile attribute length %u in class file %s",
3450           attribute_length, THREAD);
3451         return;
3452       }
3453     } else if (_major_version >= JAVA_1_5_VERSION) {
3454       if (tag == vmSymbols::tag_signature()) {
3455         if (_generic_signature_index != 0) {
3456           classfile_parse_error(
3457             "Multiple Signature attributes in class file %s", THREAD);
3458           return;
3459         }
3460         if (attribute_length != 2) {
3461           classfile_parse_error(
3462             "Wrong Signature attribute length %u in class file %s",
3463             attribute_length, THREAD);
3464           return;
3465         }
3466         parse_classfile_signature_attribute(cfs, CHECK);
3467       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3468         if (runtime_visible_annotations != nullptr) {
3469           classfile_parse_error(
3470             "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3471           return;
3472         }
3473         runtime_visible_annotations_length = attribute_length;
3474         runtime_visible_annotations = cfs->current();
3475         assert(runtime_visible_annotations != nullptr, "null visible annotations");
3476         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3477         parse_annotations(cp,
3478                           runtime_visible_annotations,
3479                           runtime_visible_annotations_length,
3480                           parsed_annotations,
3481                           _loader_data,
3482                           _can_access_vm_annotations);
3483         cfs->skip_u1_fast(runtime_visible_annotations_length);
3484       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3485         if (runtime_invisible_annotations_exists) {
3486           classfile_parse_error(
3487             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3488           return;
3489         }
3490         runtime_invisible_annotations_exists = true;
3491         cfs->skip_u1(attribute_length, CHECK);
3492       } else if (tag == vmSymbols::tag_enclosing_method()) {
3493         if (parsed_enclosingmethod_attribute) {
3494           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3495           return;
3496         } else {
3497           parsed_enclosingmethod_attribute = true;
3498         }
3499         guarantee_property(attribute_length == 4,
3500           "Wrong EnclosingMethod attribute length %u in class file %s",
3501           attribute_length, CHECK);
3502         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3503         enclosing_method_class_index  = cfs->get_u2_fast();
3504         enclosing_method_method_index = cfs->get_u2_fast();
3505         if (enclosing_method_class_index == 0) {
3506           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3507           return;
3508         }
3509         // Validate the constant pool indices and types
3510         guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3511           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3512         if (enclosing_method_method_index != 0 &&
3513             (!cp->is_within_bounds(enclosing_method_method_index) ||
3514              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3515           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3516           return;
3517         }
3518       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3519                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3520         if (parsed_bootstrap_methods_attribute) {
3521           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3522           return;
3523         }
3524         parsed_bootstrap_methods_attribute = true;
3525         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3526       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3527         if (runtime_visible_type_annotations != nullptr) {
3528           classfile_parse_error(
3529             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3530           return;
3531         }
3532         runtime_visible_type_annotations_length = attribute_length;
3533         runtime_visible_type_annotations = cfs->current();
3534         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3535         // No need for the VM to parse Type annotations
3536         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3537       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3538         if (runtime_invisible_type_annotations_exists) {
3539           classfile_parse_error(
3540             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3541           return;
3542         }
3543         runtime_invisible_type_annotations_exists = true;
3544         cfs->skip_u1(attribute_length, CHECK);
3545       } else if (_major_version >= JAVA_11_VERSION) {
3546         if (tag == vmSymbols::tag_nest_members()) {
3547           // Check for NestMembers tag
3548           if (parsed_nest_members_attribute) {
3549             classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3550             return;
3551           } else {
3552             parsed_nest_members_attribute = true;
3553           }
3554           if (parsed_nest_host_attribute) {
3555             classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3556             return;
3557           }
3558           nest_members_attribute_start = cfs->current();
3559           nest_members_attribute_length = attribute_length;
3560           cfs->skip_u1(nest_members_attribute_length, CHECK);
3561         } else if (tag == vmSymbols::tag_nest_host()) {
3562           if (parsed_nest_host_attribute) {
3563             classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3564             return;
3565           } else {
3566             parsed_nest_host_attribute = true;
3567           }
3568           if (parsed_nest_members_attribute) {
3569             classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3570             return;
3571           }
3572           if (_need_verify) {
3573             guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3574           }
3575           cfs->guarantee_more(2, CHECK);
3576           u2 class_info_index = cfs->get_u2_fast();
3577           guarantee_property(
3578                          valid_klass_reference_at(class_info_index),
3579                          "Nest-host class_info_index %u has bad constant type in class file %s",
3580                          class_info_index, CHECK);
3581           _nest_host = class_info_index;
3582 
3583         } else if (_major_version >= JAVA_16_VERSION) {
3584           if (tag == vmSymbols::tag_record()) {
3585             if (parsed_record_attribute) {
3586               classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3587               return;
3588             }
3589             parsed_record_attribute = true;
3590             record_attribute_start = cfs->current();
3591             record_attribute_length = attribute_length;
3592           } else if (_major_version >= JAVA_17_VERSION) {
3593             if (tag == vmSymbols::tag_permitted_subclasses()) {
3594               if (parsed_permitted_subclasses_attribute) {
3595                 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3596                 return;
3597               }
3598               // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3599               if (_access_flags.is_final()) {
3600                 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3601                 return;
3602               }
3603               parsed_permitted_subclasses_attribute = true;
3604               permitted_subclasses_attribute_start = cfs->current();
3605               permitted_subclasses_attribute_length = attribute_length;
3606             }
3607           }
3608           // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3609           cfs->skip_u1(attribute_length, CHECK);
3610         } else {
3611           // Unknown attribute
3612           cfs->skip_u1(attribute_length, CHECK);
3613         }
3614       } else {
3615         // Unknown attribute
3616         cfs->skip_u1(attribute_length, CHECK);
3617       }
3618     } else {
3619       // Unknown attribute
3620       cfs->skip_u1(attribute_length, CHECK);
3621     }
3622   }
3623   _class_annotations = allocate_annotations(runtime_visible_annotations,
3624                                             runtime_visible_annotations_length,
3625                                             CHECK);
3626   _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3627                                                  runtime_visible_type_annotations_length,
3628                                                  CHECK);
3629 
3630   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3631     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3632                             cfs,
3633                             cp,
3634                             inner_classes_attribute_start,
3635                             parsed_innerclasses_attribute,
3636                             enclosing_method_class_index,
3637                             enclosing_method_method_index,
3638                             CHECK);
3639     if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3640       guarantee_property(
3641         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3642         "Wrong InnerClasses attribute length in class file %s", CHECK);
3643     }
3644   }
3645 
3646   if (parsed_nest_members_attribute) {
3647     const u2 num_of_classes = parse_classfile_nest_members_attribute(
3648                             cfs,
3649                             nest_members_attribute_start,
3650                             CHECK);
3651     if (_need_verify) {
3652       guarantee_property(
3653         nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3654         "Wrong NestMembers attribute length in class file %s", CHECK);
3655     }
3656   }
3657 
3658   if (parsed_record_attribute) {
3659     const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3660                             cfs,
3661                             cp,
3662                             record_attribute_start,
3663                             CHECK);
3664     if (_need_verify) {
3665       guarantee_property(record_attribute_length == calculated_attr_length,
3666                          "Record attribute has wrong length in class file %s",
3667                          CHECK);
3668     }
3669   }
3670 
3671   if (parsed_permitted_subclasses_attribute) {
3672     const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3673                             cfs,
3674                             permitted_subclasses_attribute_start,
3675                             CHECK);
3676     if (_need_verify) {
3677       guarantee_property(
3678         permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3679         "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3680     }
3681   }
3682 
3683   if (_max_bootstrap_specifier_index >= 0) {
3684     guarantee_property(parsed_bootstrap_methods_attribute,
3685                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3686   }
3687 }
3688 
3689 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3690   assert(k != nullptr, "invariant");
3691 
3692   if (_synthetic_flag)
3693     k->set_is_synthetic();
3694   if (_sourcefile_index != 0) {
3695     k->set_source_file_name_index(_sourcefile_index);
3696   }
3697   if (_generic_signature_index != 0) {
3698     k->set_generic_signature_index(_generic_signature_index);
3699   }
3700   if (_sde_buffer != nullptr) {
3701     k->set_source_debug_extension(_sde_buffer, _sde_length);
3702   }
3703 }
3704 
3705 // Create the Annotations object that will
3706 // hold the annotations array for the Klass.
3707 void ClassFileParser::create_combined_annotations(TRAPS) {
3708     if (_class_annotations == nullptr &&
3709         _class_type_annotations == nullptr &&
3710         _fields_annotations == nullptr &&
3711         _fields_type_annotations == nullptr) {
3712       // Don't create the Annotations object unnecessarily.
3713       return;
3714     }
3715 
3716     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3717     annotations->set_class_annotations(_class_annotations);
3718     annotations->set_class_type_annotations(_class_type_annotations);
3719     annotations->set_fields_annotations(_fields_annotations);
3720     annotations->set_fields_type_annotations(_fields_type_annotations);
3721 
3722     // This is the Annotations object that will be
3723     // assigned to InstanceKlass being constructed.
3724     _combined_annotations = annotations;
3725 
3726     // The annotations arrays below has been transferred the
3727     // _combined_annotations so these fields can now be cleared.
3728     _class_annotations       = nullptr;
3729     _class_type_annotations  = nullptr;
3730     _fields_annotations      = nullptr;
3731     _fields_type_annotations = nullptr;
3732 }
3733 
3734 // Transfer ownership of metadata allocated to the InstanceKlass.
3735 void ClassFileParser::apply_parsed_class_metadata(
3736                                             InstanceKlass* this_klass,
3737                                             int java_fields_count) {
3738   assert(this_klass != nullptr, "invariant");
3739 
3740   _cp->set_pool_holder(this_klass);
3741   this_klass->set_constants(_cp);
3742   this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3743   this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3744   this_klass->set_fields_status(_fields_status);
3745   this_klass->set_methods(_methods);
3746   this_klass->set_inner_classes(_inner_classes);
3747   this_klass->set_nest_members(_nest_members);
3748   this_klass->set_nest_host_index(_nest_host);
3749   this_klass->set_annotations(_combined_annotations);
3750   this_klass->set_permitted_subclasses(_permitted_subclasses);
3751   this_klass->set_record_components(_record_components);
3752 
3753   DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3754 
3755   // Delay the setting of _local_interfaces and _transitive_interfaces until after
3756   // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3757   // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3758   // its _super. If an OOM occurs while loading the current klass, its _super field
3759   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3760   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3761   // dereferences to the deallocated _transitive_interfaces will result in a crash.
3762 
3763   // Clear out these fields so they don't get deallocated by the destructor
3764   clear_class_metadata();
3765 }
3766 
3767 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3768                                                        int anno_length,
3769                                                        TRAPS) {
3770   AnnotationArray* annotations = nullptr;
3771   if (anno != nullptr) {
3772     annotations = MetadataFactory::new_array<u1>(_loader_data,
3773                                                  anno_length,
3774                                                  CHECK_(annotations));
3775     for (int i = 0; i < anno_length; i++) {
3776       annotations->at_put(i, anno[i]);
3777     }
3778   }
3779   return annotations;
3780 }
3781 
3782 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3783                                                         const int super_class_index,
3784                                                         const bool need_verify,
3785                                                         TRAPS) {
3786   assert(cp != nullptr, "invariant");
3787   const InstanceKlass* super_klass = nullptr;
3788 
3789   if (super_class_index == 0) {
3790     guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3791                        "Invalid superclass index %u in class file %s",
3792                        super_class_index,
3793                        CHECK_NULL);
3794   } else {
3795     guarantee_property(valid_klass_reference_at(super_class_index),
3796                        "Invalid superclass index %u in class file %s",
3797                        super_class_index,
3798                        CHECK_NULL);
3799     // The class name should be legal because it is checked when parsing constant pool.
3800     // However, make sure it is not an array type.
3801     bool is_array = false;
3802     if (cp->tag_at(super_class_index).is_klass()) {
3803       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3804       if (need_verify)
3805         is_array = super_klass->is_array_klass();
3806     } else if (need_verify) {
3807       is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3808     }
3809     if (need_verify) {
3810       guarantee_property(!is_array,
3811                         "Bad superclass name in class file %s", CHECK_NULL);
3812     }
3813   }
3814   return super_klass;
3815 }
3816 
3817 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3818   _max_nonstatic_oop_maps = max_blocks;
3819   _nonstatic_oop_map_count = 0;
3820   if (max_blocks == 0) {
3821     _nonstatic_oop_maps = nullptr;
3822   } else {
3823     _nonstatic_oop_maps =
3824         NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3825     memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3826   }
3827 }
3828 
3829 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3830   assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3831   return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3832 }
3833 
3834 // addition of super oop maps
3835 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3836   assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3837          nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3838 
3839   memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3840   _nonstatic_oop_map_count += nof_blocks;
3841 }
3842 
3843 // collection of oops
3844 void OopMapBlocksBuilder::add(int offset, int count) {
3845   if (_nonstatic_oop_map_count == 0) {
3846     _nonstatic_oop_map_count++;
3847   }
3848   OopMapBlock* nonstatic_oop_map = last_oop_map();
3849   if (nonstatic_oop_map->count() == 0) {  // Unused map, set it up
3850     nonstatic_oop_map->set_offset(offset);
3851     nonstatic_oop_map->set_count(count);
3852   } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3853     nonstatic_oop_map->increment_count(count);
3854   } else { // Need a new one...
3855     _nonstatic_oop_map_count++;
3856     assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
3857     nonstatic_oop_map = last_oop_map();
3858     nonstatic_oop_map->set_offset(offset);
3859     nonstatic_oop_map->set_count(count);
3860   }
3861 }
3862 
3863 // general purpose copy, e.g. into allocated instanceKlass
3864 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
3865   if (_nonstatic_oop_map_count != 0) {
3866     memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
3867   }
3868 }
3869 
3870 // Sort and compact adjacent blocks
3871 void OopMapBlocksBuilder::compact() {
3872   if (_nonstatic_oop_map_count <= 1) {
3873     return;
3874   }
3875   /*
3876    * Since field layout sneaks in oops before values, we will be able to condense
3877    * blocks. There is potential to compact between super, own refs and values
3878    * containing refs.
3879    *
3880    * Currently compaction is slightly limited due to values being 8 byte aligned.
3881    * This may well change: FixMe if it doesn't, the code below is fairly general purpose
3882    * and maybe it doesn't need to be.
3883    */
3884   qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
3885         (_sort_Fn)OopMapBlock::compare_offset);
3886   if (_nonstatic_oop_map_count < 2) {
3887     return;
3888   }
3889 
3890   // Make a temp copy, and iterate through and copy back into the original
3891   ResourceMark rm;
3892   OopMapBlock* oop_maps_copy =
3893       NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
3894   OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
3895   copy(oop_maps_copy);
3896   OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
3897   unsigned int new_count = 1;
3898   oop_maps_copy++;
3899   while(oop_maps_copy < oop_maps_copy_end) {
3900     assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
3901     if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
3902       nonstatic_oop_map->increment_count(oop_maps_copy->count());
3903     } else {
3904       nonstatic_oop_map++;
3905       new_count++;
3906       nonstatic_oop_map->set_offset(oop_maps_copy->offset());
3907       nonstatic_oop_map->set_count(oop_maps_copy->count());
3908     }
3909     oop_maps_copy++;
3910   }
3911   assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
3912   _nonstatic_oop_map_count = new_count;
3913 }
3914 
3915 void OopMapBlocksBuilder::print_on(outputStream* st) const {
3916   st->print_cr("  OopMapBlocks: %3d  /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
3917   if (_nonstatic_oop_map_count > 0) {
3918     OopMapBlock* map = _nonstatic_oop_maps;
3919     OopMapBlock* last_map = last_oop_map();
3920     assert(map <= last_map, "Last less than first");
3921     while (map <= last_map) {
3922       st->print_cr("    Offset: %3d  -%3d Count: %3d", map->offset(),
3923                    map->offset() + map->offset_span() - heapOopSize, map->count());
3924       map++;
3925     }
3926   }
3927 }
3928 
3929 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
3930   print_on(st);
3931 }
3932 
3933 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
3934   assert(ik != nullptr, "invariant");
3935 
3936   const InstanceKlass* const super = ik->java_super();
3937 
3938   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3939   // in which case we don't have to register objects as finalizable
3940   if (!_has_empty_finalizer) {
3941     if (_has_finalizer ||
3942         (super != nullptr && super->has_finalizer())) {
3943       ik->set_has_finalizer();
3944     }
3945   }
3946 
3947 #ifdef ASSERT
3948   bool f = false;
3949   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
3950                                            vmSymbols::void_method_signature());
3951   if (InstanceKlass::is_finalization_enabled() &&
3952       (m != nullptr) && !m->is_empty_method()) {
3953       f = true;
3954   }
3955 
3956   // Spec doesn't prevent agent from redefinition of empty finalizer.
3957   // Despite the fact that it's generally bad idea and redefined finalizer
3958   // will not work as expected we shouldn't abort vm in this case
3959   if (!ik->has_redefined_this_or_super()) {
3960     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
3961   }
3962 #endif
3963 
3964   // Check if this klass supports the java.lang.Cloneable interface
3965   if (vmClasses::Cloneable_klass_loaded()) {
3966     if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
3967       ik->set_is_cloneable();
3968     }
3969   }
3970 
3971   // If it cannot be fast-path allocated, set a bit in the layout helper.
3972   // See documentation of InstanceKlass::can_be_fastpath_allocated().
3973   assert(ik->size_helper() > 0, "layout_helper is initialized");
3974   if (ik->is_abstract() || ik->is_interface()
3975       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3976       || ik->size_helper() >= FastAllocateSizeLimit) {
3977     // Forbid fast-path allocation.
3978     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3979     ik->set_layout_helper(lh);
3980   }
3981 }
3982 
3983 // utility methods for appending an array with check for duplicates
3984 
3985 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
3986                               const Array<InstanceKlass*>* const ifs) {
3987   // iterate over new interfaces
3988   for (int i = 0; i < ifs->length(); i++) {
3989     InstanceKlass* const e = ifs->at(i);
3990     assert(e->is_klass() && e->is_interface(), "just checking");
3991     // add new interface
3992     result->append_if_missing(e);
3993   }
3994 }
3995 
3996 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
3997                                                             Array<InstanceKlass*>* local_ifs,
3998                                                             ClassLoaderData* loader_data,
3999                                                             TRAPS) {
4000   assert(local_ifs != nullptr, "invariant");
4001   assert(loader_data != nullptr, "invariant");
4002 
4003   // Compute maximum size for transitive interfaces
4004   int max_transitive_size = 0;
4005   int super_size = 0;
4006   // Add superclass transitive interfaces size
4007   if (super != nullptr) {
4008     super_size = super->transitive_interfaces()->length();
4009     max_transitive_size += super_size;
4010   }
4011   // Add local interfaces' super interfaces
4012   const int local_size = local_ifs->length();
4013   for (int i = 0; i < local_size; i++) {
4014     InstanceKlass* const l = local_ifs->at(i);
4015     max_transitive_size += l->transitive_interfaces()->length();
4016   }
4017   // Finally add local interfaces
4018   max_transitive_size += local_size;
4019   // Construct array
4020   if (max_transitive_size == 0) {
4021     // no interfaces, use canonicalized array
4022     return Universe::the_empty_instance_klass_array();
4023   } else if (max_transitive_size == super_size) {
4024     // no new local interfaces added, share superklass' transitive interface array
4025     return super->transitive_interfaces();
4026   } else if (max_transitive_size == local_size) {
4027     // only local interfaces added, share local interface array
4028     return local_ifs;
4029   } else {
4030     ResourceMark rm;
4031     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4032 
4033     // Copy down from superclass
4034     if (super != nullptr) {
4035       append_interfaces(result, super->transitive_interfaces());
4036     }
4037 
4038     // Copy down from local interfaces' superinterfaces
4039     for (int i = 0; i < local_size; i++) {
4040       InstanceKlass* const l = local_ifs->at(i);
4041       append_interfaces(result, l->transitive_interfaces());
4042     }
4043     // Finally add local interfaces
4044     append_interfaces(result, local_ifs);
4045 
4046     // length will be less than the max_transitive_size if duplicates were removed
4047     const int length = result->length();
4048     assert(length <= max_transitive_size, "just checking");
4049     Array<InstanceKlass*>* const new_result =
4050       MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4051     for (int i = 0; i < length; i++) {
4052       InstanceKlass* const e = result->at(i);
4053       assert(e != nullptr, "just checking");
4054       new_result->at_put(i, e);
4055     }
4056     return new_result;
4057   }
4058 }
4059 
4060 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4061   assert(this_klass != nullptr, "invariant");
4062   const Klass* const super = this_klass->super();
4063 
4064   if (super != nullptr) {
4065     const InstanceKlass* super_ik = InstanceKlass::cast(super);
4066 
4067     if (super->is_final()) {
4068       classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4069       return;
4070     }
4071 
4072     if (super_ik->is_sealed()) {
4073       stringStream ss;
4074       ResourceMark rm(THREAD);
4075       if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
4076         classfile_icce_error(ss.as_string(), THREAD);
4077         return;
4078       }
4079     }
4080 
4081     Reflection::VerifyClassAccessResults vca_result =
4082       Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4083     if (vca_result != Reflection::ACCESS_OK) {
4084       ResourceMark rm(THREAD);
4085       char* msg = Reflection::verify_class_access_msg(this_klass,
4086                                                       InstanceKlass::cast(super),
4087                                                       vca_result);
4088 
4089       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4090       if (msg == nullptr) {
4091         bool same_module = (this_klass->module() == super->module());
4092         Exceptions::fthrow(
4093           THREAD_AND_LOCATION,
4094           vmSymbols::java_lang_IllegalAccessError(),
4095           "class %s cannot access its %ssuperclass %s (%s%s%s)",
4096           this_klass->external_name(),
4097           super->is_abstract() ? "abstract " : "",
4098           super->external_name(),
4099           (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4100           (same_module) ? "" : "; ",
4101           (same_module) ? "" : super->class_in_module_of_loader());
4102       } else {
4103         // Add additional message content.
4104         Exceptions::fthrow(
4105           THREAD_AND_LOCATION,
4106           vmSymbols::java_lang_IllegalAccessError(),
4107           "superclass access check failed: %s",
4108           msg);
4109       }
4110     }
4111   }
4112 }
4113 
4114 
4115 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4116   assert(this_klass != nullptr, "invariant");
4117   const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4118   const int lng = local_interfaces->length();
4119   for (int i = lng - 1; i >= 0; i--) {
4120     InstanceKlass* const k = local_interfaces->at(i);
4121     assert (k != nullptr && k->is_interface(), "invalid interface");
4122 
4123     if (k->is_sealed()) {
4124       stringStream ss;
4125       ResourceMark rm(THREAD);
4126       if (!k->has_as_permitted_subclass(this_klass, ss)) {
4127         classfile_icce_error(ss.as_string(), THREAD);
4128         return;
4129       }
4130     }
4131 
4132     Reflection::VerifyClassAccessResults vca_result =
4133       Reflection::verify_class_access(this_klass, k, false);
4134     if (vca_result != Reflection::ACCESS_OK) {
4135       ResourceMark rm(THREAD);
4136       char* msg = Reflection::verify_class_access_msg(this_klass,
4137                                                       k,
4138                                                       vca_result);
4139 
4140       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4141       if (msg == nullptr) {
4142         bool same_module = (this_klass->module() == k->module());
4143         Exceptions::fthrow(
4144           THREAD_AND_LOCATION,
4145           vmSymbols::java_lang_IllegalAccessError(),
4146           "class %s cannot access its superinterface %s (%s%s%s)",
4147           this_klass->external_name(),
4148           k->external_name(),
4149           (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4150           (same_module) ? "" : "; ",
4151           (same_module) ? "" : k->class_in_module_of_loader());
4152         return;
4153       } else {
4154         // Add additional message content.
4155         Exceptions::fthrow(
4156           THREAD_AND_LOCATION,
4157           vmSymbols::java_lang_IllegalAccessError(),
4158           "superinterface check failed: %s",
4159           msg);
4160         return;
4161       }
4162     }
4163   }
4164 }
4165 
4166 
4167 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4168   assert(this_klass != nullptr, "invariant");
4169   const Array<Method*>* const methods = this_klass->methods();
4170   const int num_methods = methods->length();
4171 
4172   // go thru each method and check if it overrides a final method
4173   for (int index = 0; index < num_methods; index++) {
4174     const Method* const m = methods->at(index);
4175 
4176     // skip private, static, and <init> methods
4177     if ((!m->is_private() && !m->is_static()) &&
4178         (m->name() != vmSymbols::object_initializer_name())) {
4179 
4180       const Symbol* const name = m->name();
4181       const Symbol* const signature = m->signature();
4182       const InstanceKlass* k = this_klass->java_super();
4183       const Method* super_m = nullptr;
4184       while (k != nullptr) {
4185         // skip supers that don't have final methods.
4186         if (k->has_final_method()) {
4187           // lookup a matching method in the super class hierarchy
4188           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4189           if (super_m == nullptr) {
4190             break; // didn't find any match; get out
4191           }
4192 
4193           if (super_m->is_final() && !super_m->is_static() &&
4194               !super_m->access_flags().is_private()) {
4195             // matching method in super is final, and not static or private
4196             bool can_access = Reflection::verify_member_access(this_klass,
4197                                                                super_m->method_holder(),
4198                                                                super_m->method_holder(),
4199                                                                super_m->access_flags(),
4200                                                               false, false, CHECK);
4201             if (can_access) {
4202               // this class can access super final method and therefore override
4203               ResourceMark rm(THREAD);
4204               THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4205                         err_msg("class %s overrides final method %s.%s%s",
4206                                 this_klass->external_name(),
4207                                 super_m->method_holder()->external_name(),
4208                                 name->as_C_string(),
4209                                 signature->as_C_string()));
4210             }
4211           }
4212 
4213           // continue to look from super_m's holder's super.
4214           k = super_m->method_holder()->java_super();
4215           continue;
4216         }
4217 
4218         k = k->java_super();
4219       }
4220     }
4221   }
4222 }
4223 
4224 
4225 // assumes that this_klass is an interface
4226 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4227   assert(this_klass != nullptr, "invariant");
4228   assert(this_klass->is_interface(), "not an interface");
4229   const Array<Method*>* methods = this_klass->methods();
4230   const int num_methods = methods->length();
4231 
4232   for (int index = 0; index < num_methods; index++) {
4233     const Method* const m = methods->at(index);
4234     // if m is static and not the init method, throw a verify error
4235     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4236       ResourceMark rm(THREAD);
4237 
4238       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4239       Exceptions::fthrow(
4240         THREAD_AND_LOCATION,
4241         vmSymbols::java_lang_VerifyError(),
4242         "Illegal static method %s in interface %s",
4243         m->name()->as_C_string(),
4244         this_klass->external_name()
4245       );
4246       return;
4247     }
4248   }
4249 }
4250 
4251 // utility methods for format checking
4252 
4253 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4254   const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4255   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4256   if (is_module) {
4257     ResourceMark rm(THREAD);
4258     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4259     Exceptions::fthrow(
4260       THREAD_AND_LOCATION,
4261       vmSymbols::java_lang_NoClassDefFoundError(),
4262       "%s is not a class because access_flag ACC_MODULE is set",
4263       _class_name->as_C_string());
4264     return;
4265   }
4266 
4267   if (!_need_verify) { return; }
4268 
4269   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4270   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4271   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4272   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4273   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4274   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4275   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4276 
4277   if ((is_abstract && is_final) ||
4278       (is_interface && !is_abstract) ||
4279       (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4280       (!is_interface && major_gte_1_5 && is_annotation)) {
4281     ResourceMark rm(THREAD);
4282     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4283     Exceptions::fthrow(
4284       THREAD_AND_LOCATION,
4285       vmSymbols::java_lang_ClassFormatError(),
4286       "Illegal class modifiers in class %s: 0x%X",
4287       _class_name->as_C_string(), flags
4288     );
4289     return;
4290   }
4291 }
4292 
4293 static bool has_illegal_visibility(jint flags) {
4294   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4295   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4296   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4297 
4298   return ((is_public && is_protected) ||
4299           (is_public && is_private) ||
4300           (is_protected && is_private));
4301 }
4302 
4303 // A legal major_version.minor_version must be one of the following:
4304 //
4305 //  Major_version >= 45 and major_version < 56, any minor_version.
4306 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4307 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4308 //
4309 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4310   ResourceMark rm(THREAD);
4311   const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4312   if (major < JAVA_MIN_SUPPORTED_VERSION) {
4313     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4314                          class_name, major, minor, THREAD);
4315     return;
4316   }
4317 
4318   if (major > max_version) {
4319     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4320     Exceptions::fthrow(
4321       THREAD_AND_LOCATION,
4322       vmSymbols::java_lang_UnsupportedClassVersionError(),
4323       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4324       "this version of the Java Runtime only recognizes class file versions up to %u.0",
4325       class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4326     return;
4327   }
4328 
4329   if (major < JAVA_12_VERSION || minor == 0) {
4330     return;
4331   }
4332 
4333   if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4334     if (major != max_version) {
4335       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4336       Exceptions::fthrow(
4337         THREAD_AND_LOCATION,
4338         vmSymbols::java_lang_UnsupportedClassVersionError(),
4339         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4340         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4341         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4342       return;
4343     }
4344 
4345     if (!Arguments::enable_preview()) {
4346       classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4347                            class_name, major, minor, THREAD);
4348       return;
4349     }
4350 
4351   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4352     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4353                          class_name, major, minor, THREAD);
4354   }
4355 }
4356 
4357 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4358                                                    bool is_interface,
4359                                                    TRAPS) const {
4360   if (!_need_verify) { return; }
4361 
4362   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4363   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4364   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4365   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4366   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4367   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4368   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4369   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4370   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4371 
4372   bool is_illegal = false;
4373 
4374   if (is_interface) {
4375     if (!is_public || !is_static || !is_final || is_private ||
4376         is_protected || is_volatile || is_transient ||
4377         (major_gte_1_5 && is_enum)) {
4378       is_illegal = true;
4379     }
4380   } else { // not interface
4381     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4382       is_illegal = true;
4383     }
4384   }
4385 
4386   if (is_illegal) {
4387     ResourceMark rm(THREAD);
4388     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4389     Exceptions::fthrow(
4390       THREAD_AND_LOCATION,
4391       vmSymbols::java_lang_ClassFormatError(),
4392       "Illegal field modifiers in class %s: 0x%X",
4393       _class_name->as_C_string(), flags);
4394     return;
4395   }
4396 }
4397 
4398 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4399                                                     bool is_interface,
4400                                                     const Symbol* name,
4401                                                     TRAPS) const {
4402   if (!_need_verify) { return; }
4403 
4404   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4405   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4406   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4407   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4408   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4409   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4410   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4411   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4412   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4413   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4414   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
4415   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4416   const bool major_gte_17    = _major_version >= JAVA_17_VERSION;
4417   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4418 
4419   bool is_illegal = false;
4420 
4421   if (is_interface) {
4422     if (major_gte_8) {
4423       // Class file version is JAVA_8_VERSION or later Methods of
4424       // interfaces may set any of the flags except ACC_PROTECTED,
4425       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4426       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4427       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4428           (is_native || is_protected || is_final || is_synchronized) ||
4429           // If a specific method of a class or interface has its
4430           // ACC_ABSTRACT flag set, it must not have any of its
4431           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4432           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4433           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4434           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4435           (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4436         is_illegal = true;
4437       }
4438     } else if (major_gte_1_5) {
4439       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4440       if (!is_public || is_private || is_protected || is_static || is_final ||
4441           is_synchronized || is_native || !is_abstract || is_strict) {
4442         is_illegal = true;
4443       }
4444     } else {
4445       // Class file version is pre-JAVA_1_5_VERSION
4446       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4447         is_illegal = true;
4448       }
4449     }
4450   } else { // not interface
4451     if (has_illegal_visibility(flags)) {
4452       is_illegal = true;
4453     } else {
4454       if (is_initializer) {
4455         if (is_static || is_final || is_synchronized || is_native ||
4456             is_abstract || (major_gte_1_5 && is_bridge)) {
4457           is_illegal = true;
4458         }
4459       } else { // not initializer
4460         if (is_abstract) {
4461           if ((is_final || is_native || is_private || is_static ||
4462               (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4463             is_illegal = true;
4464           }
4465         }
4466       }
4467     }
4468   }
4469 
4470   if (is_illegal) {
4471     ResourceMark rm(THREAD);
4472     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4473     Exceptions::fthrow(
4474       THREAD_AND_LOCATION,
4475       vmSymbols::java_lang_ClassFormatError(),
4476       "Method %s in class %s has illegal modifiers: 0x%X",
4477       name->as_C_string(), _class_name->as_C_string(), flags);
4478     return;
4479   }
4480 }
4481 
4482 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4483                                         int length,
4484                                         TRAPS) const {
4485   assert(_need_verify, "only called when _need_verify is true");
4486   // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4487   if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4488     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4489   }
4490 }
4491 
4492 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4493 // In class names, '/' separates unqualified names.  This is verified in this function also.
4494 // Method names also may not contain the characters '<' or '>', unless <init>
4495 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4496 // method.  Because these names have been checked as special cases before
4497 // calling this method in verify_legal_method_name.
4498 //
4499 // This method is also called from the modular system APIs in modules.cpp
4500 // to verify the validity of module and package names.
4501 bool ClassFileParser::verify_unqualified_name(const char* name,
4502                                               unsigned int length,
4503                                               int type) {
4504   if (length == 0) return false;  // Must have at least one char.
4505   for (const char* p = name; p != name + length; p++) {
4506     switch(*p) {
4507       case JVM_SIGNATURE_DOT:
4508       case JVM_SIGNATURE_ENDCLASS:
4509       case JVM_SIGNATURE_ARRAY:
4510         // do not permit '.', ';', or '['
4511         return false;
4512       case JVM_SIGNATURE_SLASH:
4513         // check for '//' or leading or trailing '/' which are not legal
4514         // unqualified name must not be empty
4515         if (type == ClassFileParser::LegalClass) {
4516           if (p == name || p+1 >= name+length ||
4517               *(p+1) == JVM_SIGNATURE_SLASH) {
4518             return false;
4519           }
4520         } else {
4521           return false;   // do not permit '/' unless it's class name
4522         }
4523         break;
4524       case JVM_SIGNATURE_SPECIAL:
4525       case JVM_SIGNATURE_ENDSPECIAL:
4526         // do not permit '<' or '>' in method names
4527         if (type == ClassFileParser::LegalMethod) {
4528           return false;
4529         }
4530     }
4531   }
4532   return true;
4533 }
4534 
4535 // Take pointer to a UTF8 byte string (not NUL-terminated).
4536 // Skip over the longest part of the string that could
4537 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4538 // Return a pointer to just past the fieldname.
4539 // Return null if no fieldname at all was found, or in the case of slash_ok
4540 // being true, we saw consecutive slashes (meaning we were looking for a
4541 // qualified path but found something that was badly-formed).
4542 static const char* skip_over_field_name(const char* const name,
4543                                         bool slash_ok,
4544                                         unsigned int length) {
4545   const char* p;
4546   jboolean last_is_slash = false;
4547   jboolean not_first_ch = false;
4548 
4549   for (p = name; p != name + length; not_first_ch = true) {
4550     const char* old_p = p;
4551     jchar ch = *p;
4552     if (ch < 128) {
4553       p++;
4554       // quick check for ascii
4555       if ((ch >= 'a' && ch <= 'z') ||
4556         (ch >= 'A' && ch <= 'Z') ||
4557         (ch == '_' || ch == '$') ||
4558         (not_first_ch && ch >= '0' && ch <= '9')) {
4559         last_is_slash = false;
4560         continue;
4561       }
4562       if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4563         if (last_is_slash) {
4564           return nullptr;  // Don't permit consecutive slashes
4565         }
4566         last_is_slash = true;
4567         continue;
4568       }
4569     }
4570     else {
4571       jint unicode_ch;
4572       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4573       p = tmp_p;
4574       last_is_slash = false;
4575       // Check if ch is Java identifier start or is Java identifier part
4576       // 4672820: call java.lang.Character methods directly without generating separate tables.
4577       EXCEPTION_MARK;
4578       // return value
4579       JavaValue result(T_BOOLEAN);
4580       // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4581       JavaCallArguments args;
4582       args.push_int(unicode_ch);
4583 
4584       if (not_first_ch) {
4585         // public static boolean isJavaIdentifierPart(char ch);
4586         JavaCalls::call_static(&result,
4587           vmClasses::Character_klass(),
4588           vmSymbols::isJavaIdentifierPart_name(),
4589           vmSymbols::int_bool_signature(),
4590           &args,
4591           THREAD);
4592       } else {
4593         // public static boolean isJavaIdentifierStart(char ch);
4594         JavaCalls::call_static(&result,
4595           vmClasses::Character_klass(),
4596           vmSymbols::isJavaIdentifierStart_name(),
4597           vmSymbols::int_bool_signature(),
4598           &args,
4599           THREAD);
4600       }
4601       if (HAS_PENDING_EXCEPTION) {
4602         CLEAR_PENDING_EXCEPTION;
4603         return nullptr;
4604       }
4605       if(result.get_jboolean()) {
4606         continue;
4607       }
4608     }
4609     return (not_first_ch) ? old_p : nullptr;
4610   }
4611   return (not_first_ch && !last_is_slash) ? p : nullptr;
4612 }
4613 
4614 // Take pointer to a UTF8 byte string (not NUL-terminated).
4615 // Skip over the longest part of the string that could
4616 // be taken as a field signature. Allow "void" if void_ok.
4617 // Return a pointer to just past the signature.
4618 // Return null if no legal signature is found.
4619 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4620                                                        bool void_ok,
4621                                                        unsigned int length,
4622                                                        TRAPS) const {
4623   unsigned int array_dim = 0;
4624   while (length > 0) {
4625     switch (signature[0]) {
4626     case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4627     case JVM_SIGNATURE_BOOLEAN:
4628     case JVM_SIGNATURE_BYTE:
4629     case JVM_SIGNATURE_CHAR:
4630     case JVM_SIGNATURE_SHORT:
4631     case JVM_SIGNATURE_INT:
4632     case JVM_SIGNATURE_FLOAT:
4633     case JVM_SIGNATURE_LONG:
4634     case JVM_SIGNATURE_DOUBLE:
4635       return signature + 1;
4636     case JVM_SIGNATURE_CLASS: {
4637       if (_major_version < JAVA_1_5_VERSION) {
4638         // Skip over the class name if one is there
4639         const char* const p = skip_over_field_name(signature + 1, true, --length);
4640 
4641         // The next character better be a semicolon
4642         if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4643           return p + 1;
4644         }
4645       }
4646       else {
4647         // Skip leading 'L' and ignore first appearance of ';'
4648         signature++;
4649         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4650         // Format check signature
4651         if (c != nullptr) {
4652           int newlen = pointer_delta_as_int(c, (char*) signature);
4653           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4654           if (!legal) {
4655             classfile_parse_error("Class name is empty or contains illegal character "
4656                                   "in descriptor in class file %s",
4657                                   THREAD);
4658             return nullptr;
4659           }
4660           return signature + newlen + 1;
4661         }
4662       }
4663       return nullptr;
4664     }
4665     case JVM_SIGNATURE_ARRAY:
4666       array_dim++;
4667       if (array_dim > 255) {
4668         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4669         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4670         return nullptr;
4671       }
4672       // The rest of what's there better be a legal signature
4673       signature++;
4674       length--;
4675       void_ok = false;
4676       break;
4677     default:
4678       return nullptr;
4679     }
4680   }
4681   return nullptr;
4682 }
4683 
4684 // Checks if name is a legal class name.
4685 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4686   if (!_need_verify) { return; }
4687 
4688   assert(name->refcount() > 0, "symbol must be kept alive");
4689   char* bytes = (char*)name->bytes();
4690   unsigned int length = name->utf8_length();
4691   bool legal = false;
4692 
4693   if (length > 0) {
4694     const char* p;
4695     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4696       p = skip_over_field_signature(bytes, false, length, CHECK);
4697       legal = (p != nullptr) && ((p - bytes) == (int)length);
4698     } else if (_major_version < JAVA_1_5_VERSION) {
4699       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4700         p = skip_over_field_name(bytes, true, length);
4701         legal = (p != nullptr) && ((p - bytes) == (int)length);
4702       }
4703     } else {
4704       // 4900761: relax the constraints based on JSR202 spec
4705       // Class names may be drawn from the entire Unicode character set.
4706       // Identifiers between '/' must be unqualified names.
4707       // The utf8 string has been verified when parsing cpool entries.
4708       legal = verify_unqualified_name(bytes, length, LegalClass);
4709     }
4710   }
4711   if (!legal) {
4712     ResourceMark rm(THREAD);
4713     assert(_class_name != nullptr, "invariant");
4714     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4715     Exceptions::fthrow(
4716       THREAD_AND_LOCATION,
4717       vmSymbols::java_lang_ClassFormatError(),
4718       "Illegal class name \"%.*s\" in class file %s", length, bytes,
4719       _class_name->as_C_string()
4720     );
4721     return;
4722   }
4723 }
4724 
4725 // Checks if name is a legal field name.
4726 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4727   if (!_need_verify) { return; }
4728 
4729   char* bytes = (char*)name->bytes();
4730   unsigned int length = name->utf8_length();
4731   bool legal = false;
4732 
4733   if (length > 0) {
4734     if (_major_version < JAVA_1_5_VERSION) {
4735       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4736         const char* p = skip_over_field_name(bytes, false, length);
4737         legal = (p != nullptr) && ((p - bytes) == (int)length);
4738       }
4739     } else {
4740       // 4881221: relax the constraints based on JSR202 spec
4741       legal = verify_unqualified_name(bytes, length, LegalField);
4742     }
4743   }
4744 
4745   if (!legal) {
4746     ResourceMark rm(THREAD);
4747     assert(_class_name != nullptr, "invariant");
4748     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4749     Exceptions::fthrow(
4750       THREAD_AND_LOCATION,
4751       vmSymbols::java_lang_ClassFormatError(),
4752       "Illegal field name \"%.*s\" in class %s", length, bytes,
4753       _class_name->as_C_string()
4754     );
4755     return;
4756   }
4757 }
4758 
4759 // Checks if name is a legal method name.
4760 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4761   if (!_need_verify) { return; }
4762 
4763   assert(name != nullptr, "method name is null");
4764   char* bytes = (char*)name->bytes();
4765   unsigned int length = name->utf8_length();
4766   bool legal = false;
4767 
4768   if (length > 0) {
4769     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4770       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4771         legal = true;
4772       }
4773     } else if (_major_version < JAVA_1_5_VERSION) {
4774       const char* p;
4775       p = skip_over_field_name(bytes, false, length);
4776       legal = (p != nullptr) && ((p - bytes) == (int)length);
4777     } else {
4778       // 4881221: relax the constraints based on JSR202 spec
4779       legal = verify_unqualified_name(bytes, length, LegalMethod);
4780     }
4781   }
4782 
4783   if (!legal) {
4784     ResourceMark rm(THREAD);
4785     assert(_class_name != nullptr, "invariant");
4786     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4787     Exceptions::fthrow(
4788       THREAD_AND_LOCATION,
4789       vmSymbols::java_lang_ClassFormatError(),
4790       "Illegal method name \"%.*s\" in class %s", length, bytes,
4791       _class_name->as_C_string()
4792     );
4793     return;
4794   }
4795 }
4796 
4797 
4798 // Checks if signature is a legal field signature.
4799 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4800                                                    const Symbol* signature,
4801                                                    TRAPS) const {
4802   if (!_need_verify) { return; }
4803 
4804   const char* const bytes = (const char*)signature->bytes();
4805   const unsigned int length = signature->utf8_length();
4806   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4807 
4808   if (p == nullptr || (p - bytes) != (int)length) {
4809     throwIllegalSignature("Field", name, signature, CHECK);
4810   }
4811 }
4812 
4813 // Check that the signature is compatible with the method name.  For example,
4814 // check that <init> has a void signature.
4815 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4816                                                        const Symbol* signature,
4817                                                        TRAPS) const {
4818   if (!_need_verify) {
4819     return;
4820   }
4821 
4822   // Class initializers cannot have args for class format version >= 51.
4823   if (name == vmSymbols::class_initializer_name() &&
4824       signature != vmSymbols::void_method_signature() &&
4825       _major_version >= JAVA_7_VERSION) {
4826     throwIllegalSignature("Method", name, signature, THREAD);
4827     return;
4828   }
4829 
4830   int sig_length = signature->utf8_length();
4831   if (name->utf8_length() > 0 &&
4832       name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4833       sig_length > 0 &&
4834       signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4835     throwIllegalSignature("Method", name, signature, THREAD);
4836   }
4837 }
4838 
4839 // Checks if signature is a legal method signature.
4840 // Returns number of parameters
4841 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
4842                                                    const Symbol* signature,
4843                                                    TRAPS) const {
4844   if (!_need_verify) {
4845     // make sure caller's args_size will be less than 0 even for non-static
4846     // method so it will be recomputed in compute_size_of_parameters().
4847     return -2;
4848   }
4849 
4850   unsigned int args_size = 0;
4851   const char* p = (const char*)signature->bytes();
4852   unsigned int length = signature->utf8_length();
4853   const char* nextp;
4854 
4855   // The first character must be a '('
4856   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4857     length--;
4858     // Skip over legal field signatures
4859     nextp = skip_over_field_signature(p, false, length, CHECK_0);
4860     while ((length > 0) && (nextp != nullptr)) {
4861       args_size++;
4862       if (p[0] == 'J' || p[0] == 'D') {
4863         args_size++;
4864       }
4865       length -= pointer_delta_as_int(nextp, p);
4866       p = nextp;
4867       nextp = skip_over_field_signature(p, false, length, CHECK_0);
4868     }
4869     // The first non-signature thing better be a ')'
4870     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4871       length--;
4872       // Now we better just have a return value
4873       nextp = skip_over_field_signature(p, true, length, CHECK_0);
4874       if (nextp && ((int)length == (nextp - p))) {
4875         return args_size;
4876       }
4877     }
4878   }
4879   // Report error
4880   throwIllegalSignature("Method", name, signature, THREAD);
4881   return 0;
4882 }
4883 
4884 int ClassFileParser::static_field_size() const {
4885   assert(_field_info != nullptr, "invariant");
4886   return _field_info->_static_field_size;
4887 }
4888 
4889 int ClassFileParser::total_oop_map_count() const {
4890   assert(_field_info != nullptr, "invariant");
4891   return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4892 }
4893 
4894 jint ClassFileParser::layout_size() const {
4895   assert(_field_info != nullptr, "invariant");
4896   return _field_info->_instance_size;
4897 }
4898 
4899 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4900                                          const Array<Method*>* methods) {
4901   assert(ik != nullptr, "invariant");
4902   assert(methods != nullptr, "invariant");
4903 
4904   // Set up Method*::intrinsic_id as soon as we know the names of methods.
4905   // (We used to do this lazily, but now we query it in Rewriter,
4906   // which is eagerly done for every method, so we might as well do it now,
4907   // when everything is fresh in memory.)
4908   const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4909 
4910   if (klass_id != vmSymbolID::NO_SID) {
4911     for (int j = 0; j < methods->length(); ++j) {
4912       Method* method = methods->at(j);
4913       method->init_intrinsic_id(klass_id);
4914 
4915       if (CheckIntrinsics) {
4916         // Check if an intrinsic is defined for method 'method',
4917         // but the method is not annotated with @IntrinsicCandidate.
4918         if (method->intrinsic_id() != vmIntrinsics::_none &&
4919             !method->intrinsic_candidate()) {
4920               tty->print("Compiler intrinsic is defined for method [%s], "
4921               "but the method is not annotated with @IntrinsicCandidate.%s",
4922               method->name_and_sig_as_C_string(),
4923               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4924             );
4925           tty->cr();
4926           DEBUG_ONLY(vm_exit(1));
4927         }
4928         // Check is the method 'method' is annotated with @IntrinsicCandidate,
4929         // but there is no intrinsic available for it.
4930         if (method->intrinsic_candidate() &&
4931           method->intrinsic_id() == vmIntrinsics::_none) {
4932             tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
4933               "but no compiler intrinsic is defined for the method.%s",
4934               method->name_and_sig_as_C_string(),
4935               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4936             );
4937           tty->cr();
4938           DEBUG_ONLY(vm_exit(1));
4939         }
4940       }
4941     } // end for
4942 
4943 #ifdef ASSERT
4944     if (CheckIntrinsics) {
4945       // Check for orphan methods in the current class. A method m
4946       // of a class C is orphan if an intrinsic is defined for method m,
4947       // but class C does not declare m.
4948       // The check is potentially expensive, therefore it is available
4949       // only in debug builds.
4950 
4951       for (auto id : EnumRange<vmIntrinsicID>{}) {
4952         if (vmIntrinsics::_compiledLambdaForm == id) {
4953           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4954           // generated for the JVM from a LambdaForm and therefore no method
4955           // is defined for it.
4956           continue;
4957         }
4958         if (vmIntrinsics::_blackhole == id) {
4959           // The _blackhole intrinsic is a special marker. No explicit method
4960           // is defined for it.
4961           continue;
4962         }
4963 
4964         if (vmIntrinsics::class_for(id) == klass_id) {
4965           // Check if the current class contains a method with the same
4966           // name, flags, signature.
4967           bool match = false;
4968           for (int j = 0; j < methods->length(); ++j) {
4969             const Method* method = methods->at(j);
4970             if (method->intrinsic_id() == id) {
4971               match = true;
4972               break;
4973             }
4974           }
4975 
4976           if (!match) {
4977             char buf[1000];
4978             tty->print("Compiler intrinsic is defined for method [%s], "
4979                        "but the method is not available in class [%s].%s",
4980                         vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
4981                         ik->name()->as_C_string(),
4982                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4983             );
4984             tty->cr();
4985             DEBUG_ONLY(vm_exit(1));
4986           }
4987         }
4988       } // end for
4989     } // CheckIntrinsics
4990 #endif // ASSERT
4991   }
4992 }
4993 
4994 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
4995                                                       const ClassInstanceInfo& cl_inst_info,
4996                                                       TRAPS) {
4997   if (_klass != nullptr) {
4998     return _klass;
4999   }
5000 
5001   InstanceKlass* const ik =
5002     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5003 
5004   if (is_hidden()) {
5005     mangle_hidden_class_name(ik);
5006   }
5007 
5008   fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5009 
5010   assert(_klass == ik, "invariant");
5011 
5012   return ik;
5013 }
5014 
5015 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5016                                           bool changed_by_loadhook,
5017                                           const ClassInstanceInfo& cl_inst_info,
5018                                           TRAPS) {
5019   assert(ik != nullptr, "invariant");
5020 
5021   // Set name and CLD before adding to CLD
5022   ik->set_class_loader_data(_loader_data);
5023   ik->set_class_loader_type();
5024   ik->set_name(_class_name);
5025 
5026   // Add all classes to our internal class loader list here,
5027   // including classes in the bootstrap (null) class loader.
5028   const bool publicize = !is_internal();
5029 
5030   _loader_data->add_class(ik, publicize);
5031 
5032   set_klass_to_deallocate(ik);
5033 
5034   assert(_field_info != nullptr, "invariant");
5035   assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5036   assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5037          "sanity");
5038 
5039   assert(ik->is_instance_klass(), "sanity");
5040   assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5041 
5042   // Fill in information already parsed
5043   ik->set_should_verify_class(_need_verify);
5044 
5045   // Not yet: supers are done below to support the new subtype-checking fields
5046   ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5047   ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5048   ik->set_static_oop_field_count(_static_oop_count);
5049 
5050   // this transfers ownership of a lot of arrays from
5051   // the parser onto the InstanceKlass*
5052   apply_parsed_class_metadata(ik, _java_fields_count);
5053 
5054   // can only set dynamic nest-host after static nest information is set
5055   if (cl_inst_info.dynamic_nest_host() != nullptr) {
5056     ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5057   }
5058 
5059   // note that is not safe to use the fields in the parser from this point on
5060   assert(nullptr == _cp, "invariant");
5061   assert(nullptr == _fieldinfo_stream, "invariant");
5062   assert(nullptr == _fieldinfo_search_table, "invariant");
5063   assert(nullptr == _fields_status, "invariant");
5064   assert(nullptr == _methods, "invariant");
5065   assert(nullptr == _inner_classes, "invariant");
5066   assert(nullptr == _nest_members, "invariant");
5067   assert(nullptr == _combined_annotations, "invariant");
5068   assert(nullptr == _record_components, "invariant");
5069   assert(nullptr == _permitted_subclasses, "invariant");
5070 
5071   if (_has_localvariable_table) {
5072     ik->set_has_localvariable_table(true);
5073   }
5074 
5075   if (_has_final_method) {
5076     ik->set_has_final_method();
5077   }
5078 
5079   ik->copy_method_ordering(_method_ordering, CHECK);
5080   // The InstanceKlass::_methods_jmethod_ids cache
5081   // is managed on the assumption that the initial cache
5082   // size is equal to the number of methods in the class. If
5083   // that changes, then InstanceKlass::idnum_can_increment()
5084   // has to be changed accordingly.
5085   ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5086 
5087   ik->set_this_class_index(_this_class_index);
5088 
5089   if (_is_hidden) {
5090     // _this_class_index is a CONSTANT_Class entry that refers to this
5091     // hidden class itself. If this class needs to refer to its own methods
5092     // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5093     // _this_class_index. However, because this class is hidden (it's
5094     // not stored in SystemDictionary), _this_class_index cannot be resolved
5095     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5096     // Therefore, we must eagerly resolve _this_class_index now.
5097     ik->constants()->klass_at_put(_this_class_index, ik);
5098   }
5099 
5100   ik->set_minor_version(_minor_version);
5101   ik->set_major_version(_major_version);
5102   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5103   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5104 
5105   assert(!_is_hidden || ik->is_hidden(), "must be set already");
5106 
5107   // Set PackageEntry for this_klass
5108   oop cl = ik->class_loader();
5109   Handle clh = Handle(THREAD, cl);
5110   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5111   ik->set_package(cld, nullptr, CHECK);
5112 
5113   const Array<Method*>* const methods = ik->methods();
5114   assert(methods != nullptr, "invariant");
5115   const int methods_len = methods->length();
5116 
5117   check_methods_for_intrinsics(ik, methods);
5118 
5119   // Fill in field values obtained by parse_classfile_attributes
5120   if (_parsed_annotations->has_any_annotations()) {
5121     _parsed_annotations->apply_to(ik);
5122   }
5123 
5124   apply_parsed_class_attributes(ik);
5125 
5126   // Miranda methods
5127   if ((_num_miranda_methods > 0) ||
5128       // if this class introduced new miranda methods or
5129       (_super_klass != nullptr && _super_klass->has_miranda_methods())
5130         // super class exists and this class inherited miranda methods
5131      ) {
5132        ik->set_has_miranda_methods(); // then set a flag
5133   }
5134 
5135   // Fill in information needed to compute superclasses.
5136   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5137   ik->set_transitive_interfaces(_transitive_interfaces);
5138   ik->set_local_interfaces(_local_interfaces);
5139   _transitive_interfaces = nullptr;
5140   _local_interfaces = nullptr;
5141 
5142   // Initialize itable offset tables
5143   klassItable::setup_itable_offset_table(ik);
5144 
5145   // Compute transitive closure of interfaces this class implements
5146   // Do final class setup
5147   OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5148   if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5149     oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5150   }
5151 
5152   if (_has_contended_fields || _parsed_annotations->is_contended() ||
5153       ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5154     ik->set_has_contended_annotations(true);
5155   }
5156 
5157   // Fill in has_finalizer and layout_helper
5158   set_precomputed_flags(ik);
5159 
5160   // check if this class can access its super class
5161   check_super_class_access(ik, CHECK);
5162 
5163   // check if this class can access its superinterfaces
5164   check_super_interface_access(ik, CHECK);
5165 
5166   // check if this class overrides any final method
5167   check_final_method_override(ik, CHECK);
5168 
5169   // reject static interface methods prior to Java 8
5170   if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5171     check_illegal_static_method(ik, CHECK);
5172   }
5173 
5174   // Obtain this_klass' module entry
5175   ModuleEntry* module_entry = ik->module();
5176   assert(module_entry != nullptr, "module_entry should always be set");
5177 
5178   // Obtain java.lang.Module
5179   Handle module_handle(THREAD, module_entry->module_oop());
5180 
5181   // Allocate mirror and initialize static fields
5182   java_lang_Class::create_mirror(ik,
5183                                  Handle(THREAD, _loader_data->class_loader()),
5184                                  module_handle,
5185                                  _protection_domain,
5186                                  cl_inst_info.class_data(),
5187                                  CHECK);
5188 
5189   assert(_all_mirandas != nullptr, "invariant");
5190 
5191   // Generate any default methods - default methods are public interface methods
5192   // that have a default implementation.  This is new with Java 8.
5193   if (_has_nonstatic_concrete_methods) {
5194     DefaultMethods::generate_default_methods(ik,
5195                                              _all_mirandas,
5196                                              CHECK);
5197   }
5198 
5199   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5200   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5201       !module_entry->has_default_read_edges()) {
5202     if (!module_entry->set_has_default_read_edges()) {
5203       // We won a potential race
5204       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5205     }
5206   }
5207 
5208   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5209 
5210   if (!is_internal()) {
5211     ik->print_class_load_logging(_loader_data, module_entry, _stream);
5212 
5213     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5214         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5215         log_is_enabled(Info, class, preview)) {
5216       ResourceMark rm;
5217       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5218                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5219     }
5220 
5221     if (log_is_enabled(Debug, class, resolve))  {
5222       ResourceMark rm;
5223       // print out the superclass.
5224       const char * from = ik->external_name();
5225       if (ik->java_super() != nullptr) {
5226         log_debug(class, resolve)("%s %s (super)",
5227                    from,
5228                    ik->java_super()->external_name());
5229       }
5230       // print out each of the interface classes referred to by this class.
5231       const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5232       if (local_interfaces != nullptr) {
5233         const int length = local_interfaces->length();
5234         for (int i = 0; i < length; i++) {
5235           const InstanceKlass* const k = local_interfaces->at(i);
5236           const char * to = k->external_name();
5237           log_debug(class, resolve)("%s %s (interface)", from, to);
5238         }
5239       }
5240     }
5241   }
5242 
5243   JFR_ONLY(INIT_ID(ik);)
5244 
5245   // If we reach here, all is well.
5246   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5247   // in order for it to not be destroyed in the ClassFileParser destructor.
5248   set_klass_to_deallocate(nullptr);
5249 
5250   // it's official
5251   set_klass(ik);
5252 
5253   DEBUG_ONLY(ik->verify();)
5254 }
5255 
5256 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5257   // Decrement the refcount in the old name, since we're clobbering it.
5258   _class_name->decrement_refcount();
5259 
5260   _class_name = new_class_name;
5261   // Increment the refcount of the new name.
5262   // Now the ClassFileParser owns this name and will decrement in
5263   // the destructor.
5264   _class_name->increment_refcount();
5265 }
5266 
5267 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5268                                  Symbol* name,
5269                                  ClassLoaderData* loader_data,
5270                                  const ClassLoadInfo* cl_info,
5271                                  Publicity pub_level,
5272                                  TRAPS) :
5273   _stream(stream),
5274   _class_name(nullptr),
5275   _loader_data(loader_data),
5276   _is_hidden(cl_info->is_hidden()),
5277   _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5278   _orig_cp_size(0),
5279   _static_oop_count(0),
5280   _super_klass(),
5281   _cp(nullptr),
5282   _fieldinfo_stream(nullptr),
5283   _fieldinfo_search_table(nullptr),
5284   _fields_status(nullptr),
5285   _methods(nullptr),
5286   _inner_classes(nullptr),
5287   _nest_members(nullptr),
5288   _nest_host(0),
5289   _permitted_subclasses(nullptr),
5290   _record_components(nullptr),
5291   _local_interfaces(nullptr),
5292   _transitive_interfaces(nullptr),
5293   _combined_annotations(nullptr),
5294   _class_annotations(nullptr),
5295   _class_type_annotations(nullptr),
5296   _fields_annotations(nullptr),
5297   _fields_type_annotations(nullptr),
5298   _klass(nullptr),
5299   _klass_to_deallocate(nullptr),
5300   _parsed_annotations(nullptr),
5301   _field_info(nullptr),
5302   _temp_field_info(nullptr),
5303   _method_ordering(nullptr),
5304   _all_mirandas(nullptr),
5305   _vtable_size(0),
5306   _itable_size(0),
5307   _num_miranda_methods(0),
5308   _protection_domain(cl_info->protection_domain()),
5309   _access_flags(),
5310   _pub_level(pub_level),
5311   _bad_constant_seen(0),
5312   _synthetic_flag(false),
5313   _sde_length(false),
5314   _sde_buffer(nullptr),
5315   _sourcefile_index(0),
5316   _generic_signature_index(0),
5317   _major_version(0),
5318   _minor_version(0),
5319   _this_class_index(0),
5320   _super_class_index(0),
5321   _itfs_len(0),
5322   _java_fields_count(0),
5323   _need_verify(false),
5324   _has_nonstatic_concrete_methods(false),
5325   _declares_nonstatic_concrete_methods(false),
5326   _has_localvariable_table(false),
5327   _has_final_method(false),
5328   _has_contended_fields(false),
5329   _has_finalizer(false),
5330   _has_empty_finalizer(false),
5331   _max_bootstrap_specifier_index(-1) {
5332 
5333   _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5334   _class_name->increment_refcount();
5335 
5336   assert(_loader_data != nullptr, "invariant");
5337   assert(stream != nullptr, "invariant");
5338   assert(_stream != nullptr, "invariant");
5339   assert(_stream->buffer() == _stream->current(), "invariant");
5340   assert(_class_name != nullptr, "invariant");
5341   assert(0 == _access_flags.as_unsigned_short(), "invariant");
5342 
5343   // Figure out whether we can skip format checking (matching classic VM behavior)
5344   // Always verify CFLH bytes from the user agents.
5345   _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5346 
5347   // synch back verification state to stream to check for truncation.
5348   stream->set_need_verify(_need_verify);
5349 
5350   parse_stream(stream, CHECK);
5351 
5352   post_process_parsed_stream(stream, _cp, CHECK);
5353 }
5354 
5355 void ClassFileParser::clear_class_metadata() {
5356   // metadata created before the instance klass is created.  Must be
5357   // deallocated if classfile parsing returns an error.
5358   _cp = nullptr;
5359   _fieldinfo_stream = nullptr;
5360   _fieldinfo_search_table = nullptr;
5361   _fields_status = nullptr;
5362   _methods = nullptr;
5363   _inner_classes = nullptr;
5364   _nest_members = nullptr;
5365   _permitted_subclasses = nullptr;
5366   _combined_annotations = nullptr;
5367   _class_annotations = _class_type_annotations = nullptr;
5368   _fields_annotations = _fields_type_annotations = nullptr;
5369   _record_components = nullptr;
5370 }
5371 
5372 // Destructor to clean up
5373 ClassFileParser::~ClassFileParser() {
5374   _class_name->decrement_refcount();
5375 
5376   if (_cp != nullptr) {
5377     MetadataFactory::free_metadata(_loader_data, _cp);
5378   }
5379 
5380   if (_fieldinfo_stream != nullptr) {
5381     MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5382   }
5383   MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5384 
5385   if (_fields_status != nullptr) {
5386     MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5387   }
5388 
5389   if (_methods != nullptr) {
5390     // Free methods
5391     InstanceKlass::deallocate_methods(_loader_data, _methods);
5392   }
5393 
5394   // beware of the Universe::empty_blah_array!!
5395   if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5396     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5397   }
5398 
5399   if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5400     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5401   }
5402 
5403   if (_record_components != nullptr) {
5404     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5405   }
5406 
5407   if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5408     MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5409   }
5410 
5411   // Free interfaces
5412   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5413                                        _local_interfaces, _transitive_interfaces);
5414 
5415   if (_combined_annotations != nullptr) {
5416     // After all annotations arrays have been created, they are installed into the
5417     // Annotations object that will be assigned to the InstanceKlass being created.
5418 
5419     // Deallocate the Annotations object and the installed annotations arrays.
5420     _combined_annotations->deallocate_contents(_loader_data);
5421 
5422     // If the _combined_annotations pointer is non-null,
5423     // then the other annotations fields should have been cleared.
5424     assert(_class_annotations       == nullptr, "Should have been cleared");
5425     assert(_class_type_annotations  == nullptr, "Should have been cleared");
5426     assert(_fields_annotations      == nullptr, "Should have been cleared");
5427     assert(_fields_type_annotations == nullptr, "Should have been cleared");
5428   } else {
5429     // If the annotations arrays were not installed into the Annotations object,
5430     // then they have to be deallocated explicitly.
5431     MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5432     MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5433     Annotations::free_contents(_loader_data, _fields_annotations);
5434     Annotations::free_contents(_loader_data, _fields_type_annotations);
5435   }
5436 
5437   clear_class_metadata();
5438   _transitive_interfaces = nullptr;
5439   _local_interfaces = nullptr;
5440 
5441   // deallocate the klass if already created.  Don't directly deallocate, but add
5442   // to the deallocate list so that the klass is removed from the CLD::_klasses list
5443   // at a safepoint.
5444   if (_klass_to_deallocate != nullptr) {
5445     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5446   }
5447 }
5448 
5449 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5450                                    TRAPS) {
5451 
5452   assert(stream != nullptr, "invariant");
5453   assert(_class_name != nullptr, "invariant");
5454 
5455   // BEGIN STREAM PARSING
5456   stream->guarantee_more(8, CHECK);  // magic, major, minor
5457   // Magic value
5458   const u4 magic = stream->get_u4_fast();
5459   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5460                      "Incompatible magic value %u in class file %s",
5461                      magic, CHECK);
5462 
5463   // Version numbers
5464   _minor_version = stream->get_u2_fast();
5465   _major_version = stream->get_u2_fast();
5466 
5467   // Check version numbers - we check this even with verifier off
5468   verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5469 
5470   stream->guarantee_more(3, CHECK); // length, first cp tag
5471   u2 cp_size = stream->get_u2_fast();
5472 
5473   guarantee_property(
5474     cp_size >= 1, "Illegal constant pool size %u in class file %s",
5475     cp_size, CHECK);
5476 
5477   _orig_cp_size = cp_size;
5478   if (is_hidden()) { // Add a slot for hidden class name.
5479     cp_size++;
5480   }
5481 
5482   _cp = ConstantPool::allocate(_loader_data,
5483                                cp_size,
5484                                CHECK);
5485 
5486   ConstantPool* const cp = _cp;
5487 
5488   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5489 
5490   assert(cp_size == (u2)cp->length(), "invariant");
5491 
5492   // ACCESS FLAGS
5493   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
5494 
5495   // Access flags
5496   u2 flags;
5497   // JVM_ACC_MODULE is defined in JDK-9 and later.
5498   if (_major_version >= JAVA_9_VERSION) {
5499     flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5500   } else {
5501     flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5502   }
5503 
5504   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5505     // Set abstract bit for old class files for backward compatibility
5506     flags |= JVM_ACC_ABSTRACT;
5507   }
5508 
5509   verify_legal_class_modifiers(flags, CHECK);
5510 
5511   short bad_constant = class_bad_constant_seen();
5512   if (bad_constant != 0) {
5513     // Do not throw CFE until after the access_flags are checked because if
5514     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5515     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5516     return;
5517   }
5518 
5519   _access_flags.set_flags(flags);
5520 
5521   // This class and superclass
5522   _this_class_index = stream->get_u2_fast();
5523   guarantee_property(
5524     valid_cp_range(_this_class_index, cp_size) &&
5525       cp->tag_at(_this_class_index).is_unresolved_klass(),
5526     "Invalid this class index %u in constant pool in class file %s",
5527     _this_class_index, CHECK);
5528 
5529   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5530   assert(class_name_in_cp != nullptr, "class_name can't be null");
5531 
5532   // Don't need to check whether this class name is legal or not.
5533   // It has been checked when constant pool is parsed.
5534   // However, make sure it is not an array type.
5535   if (_need_verify) {
5536     guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5537                        "Bad class name in class file %s",
5538                        CHECK);
5539   }
5540 
5541 #ifdef ASSERT
5542   // Basic sanity checks
5543   if (_is_hidden) {
5544     assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5545   }
5546 #endif
5547 
5548   // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5549 
5550   if (_is_hidden) {
5551     assert(_class_name != nullptr, "Unexpected null _class_name");
5552 #ifdef ASSERT
5553     if (_need_verify) {
5554       verify_legal_class_name(_class_name, CHECK);
5555     }
5556 #endif
5557 
5558   } else {
5559     // Check if name in class file matches given name
5560     if (_class_name != class_name_in_cp) {
5561       if (_class_name != vmSymbols::unknown_class_name()) {
5562         ResourceMark rm(THREAD);
5563         // Names are all known to be < 64k so we know this formatted message is not excessively large.
5564         Exceptions::fthrow(THREAD_AND_LOCATION,
5565                            vmSymbols::java_lang_NoClassDefFoundError(),
5566                            "%s (wrong name: %s)",
5567                            _class_name->as_C_string(),
5568                            class_name_in_cp->as_C_string()
5569                            );
5570         return;
5571       } else {
5572         // The class name was not known by the caller so we set it from
5573         // the value in the CP.
5574         update_class_name(class_name_in_cp);
5575       }
5576       // else nothing to do: the expected class name matches what is in the CP
5577     }
5578   }
5579 
5580   // Verification prevents us from creating names with dots in them, this
5581   // asserts that that's the case.
5582   assert(is_internal_format(_class_name), "external class name format used internally");
5583 
5584   if (!is_internal()) {
5585     LogTarget(Debug, class, preorder) lt;
5586     if (lt.is_enabled()){
5587       ResourceMark rm(THREAD);
5588       LogStream ls(lt);
5589       ls.print("%s", _class_name->as_klass_external_name());
5590       if (stream->source() != nullptr) {
5591         ls.print(" source: %s", stream->source());
5592       }
5593       ls.cr();
5594     }
5595   }
5596 
5597   // SUPERKLASS
5598   _super_class_index = stream->get_u2_fast();
5599   _super_klass = parse_super_class(cp,
5600                                    _super_class_index,
5601                                    _need_verify,
5602                                    CHECK);
5603 
5604   // Interfaces
5605   _itfs_len = stream->get_u2_fast();
5606   parse_interfaces(stream,
5607                    _itfs_len,
5608                    cp,
5609                    &_has_nonstatic_concrete_methods,
5610                    CHECK);
5611 
5612   assert(_local_interfaces != nullptr, "invariant");
5613 
5614   // Fields (offsets are filled in later)
5615   parse_fields(stream,
5616                _access_flags.is_interface(),
5617                cp,
5618                cp_size,
5619                &_java_fields_count,
5620                CHECK);
5621 
5622   assert(_temp_field_info != nullptr, "invariant");
5623 
5624   // Methods
5625   parse_methods(stream,
5626                 _access_flags.is_interface(),
5627                 &_has_localvariable_table,
5628                 &_has_final_method,
5629                 &_declares_nonstatic_concrete_methods,
5630                 CHECK);
5631 
5632   assert(_methods != nullptr, "invariant");
5633 
5634   if (_declares_nonstatic_concrete_methods) {
5635     _has_nonstatic_concrete_methods = true;
5636   }
5637 
5638   // Additional attributes/annotations
5639   _parsed_annotations = new ClassAnnotationCollector();
5640   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5641 
5642   assert(_inner_classes != nullptr, "invariant");
5643 
5644   // Finalize the Annotations metadata object,
5645   // now that all annotation arrays have been created.
5646   create_combined_annotations(CHECK);
5647 
5648   // Make sure this is the end of class file stream
5649   guarantee_property(stream->at_eos(),
5650                      "Extra bytes at the end of class file %s",
5651                      CHECK);
5652 
5653   // all bytes in stream read and parsed
5654 }
5655 
5656 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5657   ResourceMark rm;
5658   // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5659   // use a '/' because that confuses finding the class's package.  Also, can't
5660   // use an illegal char such as ';' because that causes serialization issues
5661   // and issues with hidden classes that create their own hidden classes.
5662   char addr_buf[20];
5663   if (CDSConfig::is_dumping_static_archive()) {
5664     // We want stable names for the archived hidden classes (only for static
5665     // archive for now). Spaces under default_SharedBaseAddress() will be
5666     // occupied by the archive at run time, so we know that no dynamically
5667     // loaded InstanceKlass will be placed under there.
5668     static volatile size_t counter = 0;
5669     Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5670     size_t new_id = Atomic::add(&counter, (size_t)1);
5671     jio_snprintf(addr_buf, 20, "0x%zx", new_id);
5672   } else {
5673     jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5674   }
5675   size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5676   char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5677   jio_snprintf(new_name, new_name_len, "%s+%s",
5678                _class_name->as_C_string(), addr_buf);
5679   update_class_name(SymbolTable::new_symbol(new_name));
5680 
5681   // Add a Utf8 entry containing the hidden name.
5682   assert(_class_name != nullptr, "Unexpected null _class_name");
5683   int hidden_index = _orig_cp_size; // this is an extra slot we added
5684   _cp->symbol_at_put(hidden_index, _class_name);
5685 
5686   // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5687   // We have to update the resolved_klass_index and the name_index together
5688   // so extract the existing resolved_klass_index first.
5689   CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5690   int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5691   _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5692   assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5693          "Bad name_index");
5694 }
5695 
5696 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5697                                                  ConstantPool* cp,
5698                                                  TRAPS) {
5699   assert(stream != nullptr, "invariant");
5700   assert(stream->at_eos(), "invariant");
5701   assert(cp != nullptr, "invariant");
5702   assert(_loader_data != nullptr, "invariant");
5703 
5704   if (_class_name == vmSymbols::java_lang_Object()) {
5705     guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5706                        "java.lang.Object cannot implement an interface in class file %s",
5707                        CHECK);
5708   }
5709   // We check super class after class file is parsed and format is checked
5710   if (_super_class_index > 0 && nullptr == _super_klass) {
5711     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5712     if (_access_flags.is_interface()) {
5713       // Before attempting to resolve the superclass, check for class format
5714       // errors not checked yet.
5715       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5716         "Interfaces must have java.lang.Object as superclass in class file %s",
5717         CHECK);
5718     }
5719     Handle loader(THREAD, _loader_data->class_loader());
5720     if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5721       _super_klass = vmClasses::Object_klass();
5722     } else {
5723       _super_klass = (const InstanceKlass*)
5724                        SystemDictionary::resolve_super_or_fail(_class_name,
5725                                                                super_class_name,
5726                                                                loader,
5727                                                                true,
5728                                                                CHECK);
5729     }
5730   }
5731 
5732   if (_super_klass != nullptr) {
5733     if (_super_klass->has_nonstatic_concrete_methods()) {
5734       _has_nonstatic_concrete_methods = true;
5735     }
5736 
5737     if (_super_klass->is_interface()) {
5738       classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5739       return;
5740     }
5741   }
5742 
5743   // Compute the transitive list of all unique interfaces implemented by this class
5744   _transitive_interfaces =
5745     compute_transitive_interfaces(_super_klass,
5746                                   _local_interfaces,
5747                                   _loader_data,
5748                                   CHECK);
5749 
5750   assert(_transitive_interfaces != nullptr, "invariant");
5751 
5752   // sort methods
5753   _method_ordering = sort_methods(_methods);
5754 
5755   _all_mirandas = new GrowableArray<Method*>(20);
5756 
5757   Handle loader(THREAD, _loader_data->class_loader());
5758   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5759                                                     &_num_miranda_methods,
5760                                                     _all_mirandas,
5761                                                     _super_klass,
5762                                                     _methods,
5763                                                     _access_flags,
5764                                                     _major_version,
5765                                                     loader,
5766                                                     _class_name,
5767                                                     _local_interfaces);
5768 
5769   // Size of Java itable (in words)
5770   _itable_size = _access_flags.is_interface() ? 0 :
5771     klassItable::compute_itable_size(_transitive_interfaces);
5772 
5773   assert(_parsed_annotations != nullptr, "invariant");
5774 
5775   _field_info = new FieldLayoutInfo();
5776   FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5777                         _parsed_annotations->is_contended(), _field_info);
5778   lb.build_layout();
5779 
5780   int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5781   _fieldinfo_stream =
5782     FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5783                                             injected_fields_count, loader_data(), CHECK);
5784   _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
5785   _fields_status =
5786     MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5787                                             FieldStatus(0), CHECK);
5788 }
5789 
5790 void ClassFileParser::set_klass(InstanceKlass* klass) {
5791 
5792 #ifdef ASSERT
5793   if (klass != nullptr) {
5794     assert(nullptr == _klass, "leaking?");
5795   }
5796 #endif
5797 
5798   _klass = klass;
5799 }
5800 
5801 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5802 
5803 #ifdef ASSERT
5804   if (klass != nullptr) {
5805     assert(nullptr == _klass_to_deallocate, "leaking?");
5806   }
5807 #endif
5808 
5809   _klass_to_deallocate = klass;
5810 }
5811 
5812 // Caller responsible for ResourceMark
5813 // clone stream with rewound position
5814 const ClassFileStream* ClassFileParser::clone_stream() const {
5815   assert(_stream != nullptr, "invariant");
5816 
5817   return _stream->clone();
5818 }
5819 
5820 ReferenceType ClassFileParser::super_reference_type() const {
5821   return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
5822 }
5823 
5824 bool ClassFileParser::is_instance_ref_klass() const {
5825   // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
5826   // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
5827   // klass requiring special treatment in ref-processing. The abstract
5828   // j.l.r.Reference cannot be instantiated so doesn't partake in
5829   // ref-processing.
5830   return is_java_lang_ref_Reference_subclass();
5831 }
5832 
5833 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
5834   if (_super_klass == nullptr) {
5835     return false;
5836   }
5837 
5838   if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
5839     // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
5840     return true;
5841   }
5842 
5843   return _super_klass->reference_type() != REF_NONE;
5844 }
5845 
5846 // Returns true if the future Klass will need to be addressable with a narrow Klass ID.
5847 bool ClassFileParser::klass_needs_narrow_id() const {
5848   // Classes that are never instantiated need no narrow Klass Id, since the
5849   // only point of having a narrow id is to put it into an object header. Keeping
5850   // never instantiated classes out of class space lessens the class space pressure.
5851   // For more details, see JDK-8338526.
5852   return !is_interface() && !is_abstract();
5853 }
5854 
5855 // ----------------------------------------------------------------------------
5856 // debugging
5857 
5858 #ifdef ASSERT
5859 
5860 // return true if class_name contains no '.' (internal format is '/')
5861 bool ClassFileParser::is_internal_format(Symbol* class_name) {
5862   if (class_name != nullptr) {
5863     ResourceMark rm;
5864     char* name = class_name->as_C_string();
5865     return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
5866   } else {
5867     return true;
5868   }
5869 }
5870 
5871 #endif