1 /*
   2  * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classFileParser.hpp"
  27 #include "classfile/classFileStream.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderData.inline.hpp"
  30 #include "classfile/classLoadInfo.hpp"
  31 #include "classfile/defaultMethods.hpp"
  32 #include "classfile/fieldLayoutBuilder.hpp"
  33 #include "classfile/javaClasses.inline.hpp"
  34 #include "classfile/moduleEntry.hpp"
  35 #include "classfile/packageEntry.hpp"
  36 #include "classfile/symbolTable.hpp"
  37 #include "classfile/systemDictionary.hpp"
  38 #include "classfile/verificationType.hpp"
  39 #include "classfile/verifier.hpp"
  40 #include "classfile/vmClasses.hpp"
  41 #include "classfile/vmSymbols.hpp"
  42 #include "jvm.h"
  43 #include "logging/log.hpp"
  44 #include "logging/logStream.hpp"
  45 #include "memory/allocation.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/oopFactory.hpp"
  48 #include "memory/resourceArea.hpp"
  49 #include "memory/universe.hpp"
  50 #include "oops/annotations.hpp"
  51 #include "oops/constantPool.inline.hpp"
  52 #include "oops/fieldStreams.inline.hpp"
  53 #include "oops/inlineKlass.inline.hpp"
  54 #include "oops/instanceKlass.inline.hpp"
  55 #include "oops/instanceMirrorKlass.hpp"
  56 #include "oops/klass.inline.hpp"
  57 #include "oops/klassVtable.hpp"
  58 #include "oops/metadata.hpp"
  59 #include "oops/method.inline.hpp"
  60 #include "oops/oop.inline.hpp"
  61 #include "oops/recordComponent.hpp"
  62 #include "oops/symbol.hpp"
  63 #include "prims/jvmtiExport.hpp"
  64 #include "prims/jvmtiThreadState.hpp"
  65 #include "runtime/arguments.hpp"
  66 #include "runtime/fieldDescriptor.inline.hpp"
  67 #include "runtime/handles.inline.hpp"
  68 #include "runtime/javaCalls.hpp"
  69 #include "runtime/os.hpp"
  70 #include "runtime/perfData.hpp"
  71 #include "runtime/reflection.hpp"
  72 #include "runtime/safepointVerifiers.hpp"
  73 #include "runtime/signature.hpp"
  74 #include "runtime/timer.hpp"
  75 #include "services/classLoadingService.hpp"
  76 #include "services/threadService.hpp"
  77 #include "utilities/align.hpp"
  78 #include "utilities/bitMap.inline.hpp"
  79 #include "utilities/copy.hpp"
  80 #include "utilities/formatBuffer.hpp"
  81 #include "utilities/exceptions.hpp"
  82 #include "utilities/globalDefinitions.hpp"
  83 #include "utilities/growableArray.hpp"
  84 #include "utilities/macros.hpp"
  85 #include "utilities/ostream.hpp"
  86 #include "utilities/resourceHash.hpp"
  87 #include "utilities/stringUtils.hpp"
  88 #include "utilities/utf8.hpp"
  89 #if INCLUDE_CDS
  90 #include "classfile/systemDictionaryShared.hpp"
  91 #endif
  92 #if INCLUDE_JFR
  93 #include "jfr/support/jfrTraceIdExtension.hpp"
  94 #endif
  95 
  96 // We generally try to create the oops directly when parsing, rather than
  97 // allocating temporary data structures and copying the bytes twice. A
  98 // temporary area is only needed when parsing utf8 entries in the constant
  99 // pool and when parsing line number tables.
 100 
 101 // We add assert in debug mode when class format is not checked.
 102 
 103 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
 104 #define JAVA_MIN_SUPPORTED_VERSION        45
 105 #define JAVA_PREVIEW_MINOR_VERSION        65535
 106 
 107 // Used for two backward compatibility reasons:
 108 // - to check for new additions to the class file format in JDK1.5
 109 // - to check for bug fixes in the format checker in JDK1.5
 110 #define JAVA_1_5_VERSION                  49
 111 
 112 // Used for backward compatibility reasons:
 113 // - to check for javac bug fixes that happened after 1.5
 114 // - also used as the max version when running in jdk6
 115 #define JAVA_6_VERSION                    50
 116 
 117 // Used for backward compatibility reasons:
 118 // - to disallow argument and require ACC_STATIC for <clinit> methods
 119 #define JAVA_7_VERSION                    51
 120 
 121 // Extension method support.
 122 #define JAVA_8_VERSION                    52
 123 
 124 #define JAVA_9_VERSION                    53
 125 
 126 #define JAVA_10_VERSION                   54
 127 
 128 #define JAVA_11_VERSION                   55
 129 
 130 #define JAVA_12_VERSION                   56
 131 
 132 #define JAVA_13_VERSION                   57
 133 
 134 #define JAVA_14_VERSION                   58
 135 
 136 #define JAVA_15_VERSION                   59
 137 
 138 #define JAVA_16_VERSION                   60
 139 
 140 #define JAVA_17_VERSION                   61
 141 
 142 #define JAVA_18_VERSION                   62
 143 
 144 #define JAVA_19_VERSION                   63
 145 
 146 #define JAVA_20_VERSION                   64
 147 
 148 #define JAVA_21_VERSION                   65
 149 
 150 #define CONSTANT_CLASS_DESCRIPTORS        65
 151 
 152 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
 153   assert((bad_constant == JVM_CONSTANT_Module ||
 154           bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
 155          "Unexpected bad constant pool entry");
 156   if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
 157 }
 158 
 159 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 160                                                   ConstantPool* cp,
 161                                                   const int length,
 162                                                   TRAPS) {
 163   assert(stream != NULL, "invariant");
 164   assert(cp != NULL, "invariant");
 165 
 166   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 167   // this function (_current can be allocated in a register, with scalar
 168   // replacement of aggregates). The _current pointer is copied back to
 169   // stream() when this function returns. DON'T call another method within
 170   // this method that uses stream().
 171   const ClassFileStream cfs1 = *stream;
 172   const ClassFileStream* const cfs = &cfs1;
 173 
 174   debug_only(const u1* const old_current = stream->current();)
 175 
 176   // Used for batching symbol allocations.
 177   const char* names[SymbolTable::symbol_alloc_batch_size];
 178   int lengths[SymbolTable::symbol_alloc_batch_size];
 179   int indices[SymbolTable::symbol_alloc_batch_size];
 180   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 181   int names_count = 0;
 182 
 183   // parsing  Index 0 is unused
 184   for (int index = 1; index < length; index++) {
 185     // Each of the following case guarantees one more byte in the stream
 186     // for the following tag or the access_flags following constant pool,
 187     // so we don't need bounds-check for reading tag.
 188     const u1 tag = cfs->get_u1_fast();
 189     switch (tag) {
 190       case JVM_CONSTANT_Class: {
 191         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 192         const u2 name_index = cfs->get_u2_fast();
 193         cp->klass_index_at_put(index, name_index);
 194         break;
 195       }
 196       case JVM_CONSTANT_Fieldref: {
 197         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 198         const u2 class_index = cfs->get_u2_fast();
 199         const u2 name_and_type_index = cfs->get_u2_fast();
 200         cp->field_at_put(index, class_index, name_and_type_index);
 201         break;
 202       }
 203       case JVM_CONSTANT_Methodref: {
 204         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 205         const u2 class_index = cfs->get_u2_fast();
 206         const u2 name_and_type_index = cfs->get_u2_fast();
 207         cp->method_at_put(index, class_index, name_and_type_index);
 208         break;
 209       }
 210       case JVM_CONSTANT_InterfaceMethodref: {
 211         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 212         const u2 class_index = cfs->get_u2_fast();
 213         const u2 name_and_type_index = cfs->get_u2_fast();
 214         cp->interface_method_at_put(index, class_index, name_and_type_index);
 215         break;
 216       }
 217       case JVM_CONSTANT_String : {
 218         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 219         const u2 string_index = cfs->get_u2_fast();
 220         cp->string_index_at_put(index, string_index);
 221         break;
 222       }
 223       case JVM_CONSTANT_MethodHandle :
 224       case JVM_CONSTANT_MethodType: {
 225         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 226           classfile_parse_error(
 227             "Class file version does not support constant tag %u in class file %s",
 228             tag, THREAD);
 229           return;
 230         }
 231         if (tag == JVM_CONSTANT_MethodHandle) {
 232           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 233           const u1 ref_kind = cfs->get_u1_fast();
 234           const u2 method_index = cfs->get_u2_fast();
 235           cp->method_handle_index_at_put(index, ref_kind, method_index);
 236         }
 237         else if (tag == JVM_CONSTANT_MethodType) {
 238           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 239           const u2 signature_index = cfs->get_u2_fast();
 240           cp->method_type_index_at_put(index, signature_index);
 241         }
 242         else {
 243           ShouldNotReachHere();
 244         }
 245         break;
 246       }
 247       case JVM_CONSTANT_Dynamic : {
 248         if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
 249           classfile_parse_error(
 250               "Class file version does not support constant tag %u in class file %s",
 251               tag, THREAD);
 252           return;
 253         }
 254         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 255         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 256         const u2 name_and_type_index = cfs->get_u2_fast();
 257         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 258           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 259         }
 260         cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
 261         break;
 262       }
 263       case JVM_CONSTANT_InvokeDynamic : {
 264         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 265           classfile_parse_error(
 266               "Class file version does not support constant tag %u in class file %s",
 267               tag, THREAD);
 268           return;
 269         }
 270         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 271         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 272         const u2 name_and_type_index = cfs->get_u2_fast();
 273         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 274           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 275         }
 276         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 277         break;
 278       }
 279       case JVM_CONSTANT_Integer: {
 280         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 281         const u4 bytes = cfs->get_u4_fast();
 282         cp->int_at_put(index, (jint)bytes);
 283         break;
 284       }
 285       case JVM_CONSTANT_Float: {
 286         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 287         const u4 bytes = cfs->get_u4_fast();
 288         cp->float_at_put(index, *(jfloat*)&bytes);
 289         break;
 290       }
 291       case JVM_CONSTANT_Long: {
 292         // A mangled type might cause you to overrun allocated memory
 293         guarantee_property(index + 1 < length,
 294                            "Invalid constant pool entry %u in class file %s",
 295                            index,
 296                            CHECK);
 297         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 298         const u8 bytes = cfs->get_u8_fast();
 299         cp->long_at_put(index, bytes);
 300         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 301         break;
 302       }
 303       case JVM_CONSTANT_Double: {
 304         // A mangled type might cause you to overrun allocated memory
 305         guarantee_property(index+1 < length,
 306                            "Invalid constant pool entry %u in class file %s",
 307                            index,
 308                            CHECK);
 309         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 310         const u8 bytes = cfs->get_u8_fast();
 311         cp->double_at_put(index, *(jdouble*)&bytes);
 312         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 313         break;
 314       }
 315       case JVM_CONSTANT_NameAndType: {
 316         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 317         const u2 name_index = cfs->get_u2_fast();
 318         const u2 signature_index = cfs->get_u2_fast();
 319         cp->name_and_type_at_put(index, name_index, signature_index);
 320         break;
 321       }
 322       case JVM_CONSTANT_Utf8 : {
 323         cfs->guarantee_more(2, CHECK);  // utf8_length
 324         u2  utf8_length = cfs->get_u2_fast();
 325         const u1* utf8_buffer = cfs->current();
 326         assert(utf8_buffer != NULL, "null utf8 buffer");
 327         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 328         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 329         cfs->skip_u1_fast(utf8_length);
 330 
 331         // Before storing the symbol, make sure it's legal
 332         if (_need_verify) {
 333           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 334         }
 335 
 336         unsigned int hash;
 337         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 338                                                         utf8_length,
 339                                                         hash);
 340         if (result == NULL) {
 341           names[names_count] = (const char*)utf8_buffer;
 342           lengths[names_count] = utf8_length;
 343           indices[names_count] = index;
 344           hashValues[names_count++] = hash;
 345           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 346             SymbolTable::new_symbols(_loader_data,
 347                                      constantPoolHandle(THREAD, cp),
 348                                      names_count,
 349                                      names,
 350                                      lengths,
 351                                      indices,
 352                                      hashValues);
 353             names_count = 0;
 354           }
 355         } else {
 356           cp->symbol_at_put(index, result);
 357         }
 358         break;
 359       }
 360       case JVM_CONSTANT_Module:
 361       case JVM_CONSTANT_Package: {
 362         // Record that an error occurred in these two cases but keep parsing so
 363         // that ACC_Module can be checked for in the access_flags.  Need to
 364         // throw NoClassDefFoundError in that case.
 365         if (_major_version >= JAVA_9_VERSION) {
 366           cfs->guarantee_more(3, CHECK);
 367           cfs->get_u2_fast();
 368           set_class_bad_constant_seen(tag);
 369           break;
 370         }
 371       }
 372       default: {
 373         classfile_parse_error("Unknown constant tag %u in class file %s",
 374                               tag,
 375                               THREAD);
 376         return;
 377       }
 378     } // end of switch(tag)
 379   } // end of for
 380 
 381   // Allocate the remaining symbols
 382   if (names_count > 0) {
 383     SymbolTable::new_symbols(_loader_data,
 384                              constantPoolHandle(THREAD, cp),
 385                              names_count,
 386                              names,
 387                              lengths,
 388                              indices,
 389                              hashValues);
 390   }
 391 
 392   // Copy _current pointer of local copy back to stream.
 393   assert(stream->current() == old_current, "non-exclusive use of stream");
 394   stream->set_current(cfs1.current());
 395 
 396 }
 397 
 398 static inline bool valid_cp_range(int index, int length) {
 399   return (index > 0 && index < length);
 400 }
 401 
 402 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 403   assert(cp != NULL, "invariant");
 404   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 405     return cp->symbol_at(index);
 406   }
 407   return NULL;
 408 }
 409 
 410 #ifdef ASSERT
 411 PRAGMA_DIAG_PUSH
 412 PRAGMA_FORMAT_NONLITERAL_IGNORED
 413 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
 414   ResourceMark rm(THREAD);
 415   fatal(msg, _class_name->as_C_string());
 416 }
 417 
 418 void ClassFileParser::report_assert_property_failure(const char* msg,
 419                                                      int index,
 420                                                      TRAPS) const {
 421   ResourceMark rm(THREAD);
 422   fatal(msg, index, _class_name->as_C_string());
 423 }
 424 PRAGMA_DIAG_POP
 425 #endif
 426 
 427 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 428                                          ConstantPool* const cp,
 429                                          const int length,
 430                                          TRAPS) {
 431   assert(cp != NULL, "invariant");
 432   assert(stream != NULL, "invariant");
 433 
 434   // parsing constant pool entries
 435   parse_constant_pool_entries(stream, cp, length, CHECK);
 436   if (class_bad_constant_seen() != 0) {
 437     // a bad CP entry has been detected previously so stop parsing and just return.
 438     return;
 439   }
 440 
 441   int index = 1;  // declared outside of loops for portability
 442   int num_klasses = 0;
 443 
 444   // first verification pass - validate cross references
 445   // and fixup class and string constants
 446   for (index = 1; index < length; index++) {          // Index 0 is unused
 447     const jbyte tag = cp->tag_at(index).value();
 448     switch (tag) {
 449       case JVM_CONSTANT_Class: {
 450         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 451         break;
 452       }
 453       case JVM_CONSTANT_Fieldref:
 454         // fall through
 455       case JVM_CONSTANT_Methodref:
 456         // fall through
 457       case JVM_CONSTANT_InterfaceMethodref: {
 458         if (!_need_verify) break;
 459         const int klass_ref_index = cp->klass_ref_index_at(index);
 460         const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 461         check_property(valid_klass_reference_at(klass_ref_index),
 462                        "Invalid constant pool index %u in class file %s",
 463                        klass_ref_index, CHECK);
 464         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 465           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 466           "Invalid constant pool index %u in class file %s",
 467           name_and_type_ref_index, CHECK);
 468         break;
 469       }
 470       case JVM_CONSTANT_String: {
 471         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 472         break;
 473       }
 474       case JVM_CONSTANT_Integer:
 475         break;
 476       case JVM_CONSTANT_Float:
 477         break;
 478       case JVM_CONSTANT_Long:
 479       case JVM_CONSTANT_Double: {
 480         index++;
 481         check_property(
 482           (index < length && cp->tag_at(index).is_invalid()),
 483           "Improper constant pool long/double index %u in class file %s",
 484           index, CHECK);
 485         break;
 486       }
 487       case JVM_CONSTANT_NameAndType: {
 488         if (!_need_verify) break;
 489         const int name_ref_index = cp->name_ref_index_at(index);
 490         const int signature_ref_index = cp->signature_ref_index_at(index);
 491         check_property(valid_symbol_at(name_ref_index),
 492           "Invalid constant pool index %u in class file %s",
 493           name_ref_index, CHECK);
 494         check_property(valid_symbol_at(signature_ref_index),
 495           "Invalid constant pool index %u in class file %s",
 496           signature_ref_index, CHECK);
 497         break;
 498       }
 499       case JVM_CONSTANT_Utf8:
 500         break;
 501       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 502       case JVM_CONSTANT_UnresolvedClassInError: {
 503         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 504         break;
 505       }
 506       case JVM_CONSTANT_ClassIndex: {
 507         const int class_index = cp->klass_index_at(index);
 508         check_property(valid_symbol_at(class_index),
 509           "Invalid constant pool index %u in class file %s",
 510           class_index, CHECK);
 511 
 512         Symbol* const name = cp->symbol_at(class_index);
 513         const unsigned int name_len = name->utf8_length();
 514         if (name->is_Q_signature()) {
 515           cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
 516         } else {
 517           cp->unresolved_klass_at_put(index, class_index, num_klasses++);
 518         }
 519         break;
 520       }
 521       case JVM_CONSTANT_StringIndex: {
 522         const int string_index = cp->string_index_at(index);
 523         check_property(valid_symbol_at(string_index),
 524           "Invalid constant pool index %u in class file %s",
 525           string_index, CHECK);
 526         Symbol* const sym = cp->symbol_at(string_index);
 527         cp->unresolved_string_at_put(index, sym);
 528         break;
 529       }
 530       case JVM_CONSTANT_MethodHandle: {
 531         const int ref_index = cp->method_handle_index_at(index);
 532         check_property(valid_cp_range(ref_index, length),
 533           "Invalid constant pool index %u in class file %s",
 534           ref_index, CHECK);
 535         const constantTag tag = cp->tag_at(ref_index);
 536         const int ref_kind = cp->method_handle_ref_kind_at(index);
 537 
 538         switch (ref_kind) {
 539           case JVM_REF_getField:
 540           case JVM_REF_getStatic:
 541           case JVM_REF_putField:
 542           case JVM_REF_putStatic: {
 543             check_property(
 544               tag.is_field(),
 545               "Invalid constant pool index %u in class file %s (not a field)",
 546               ref_index, CHECK);
 547             break;
 548           }
 549           case JVM_REF_invokeVirtual:
 550           case JVM_REF_newInvokeSpecial: {
 551             check_property(
 552               tag.is_method(),
 553               "Invalid constant pool index %u in class file %s (not a method)",
 554               ref_index, CHECK);
 555             break;
 556           }
 557           case JVM_REF_invokeStatic:
 558           case JVM_REF_invokeSpecial: {
 559             check_property(
 560               tag.is_method() ||
 561               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 562               "Invalid constant pool index %u in class file %s (not a method)",
 563               ref_index, CHECK);
 564             break;
 565           }
 566           case JVM_REF_invokeInterface: {
 567             check_property(
 568               tag.is_interface_method(),
 569               "Invalid constant pool index %u in class file %s (not an interface method)",
 570               ref_index, CHECK);
 571             break;
 572           }
 573           default: {
 574             classfile_parse_error(
 575               "Bad method handle kind at constant pool index %u in class file %s",
 576               index, THREAD);
 577             return;
 578           }
 579         } // switch(refkind)
 580         // Keep the ref_index unchanged.  It will be indirected at link-time.
 581         break;
 582       } // case MethodHandle
 583       case JVM_CONSTANT_MethodType: {
 584         const int ref_index = cp->method_type_index_at(index);
 585         check_property(valid_symbol_at(ref_index),
 586           "Invalid constant pool index %u in class file %s",
 587           ref_index, CHECK);
 588         break;
 589       }
 590       case JVM_CONSTANT_Dynamic: {
 591         const int name_and_type_ref_index =
 592           cp->bootstrap_name_and_type_ref_index_at(index);
 593 
 594         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 595           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 596           "Invalid constant pool index %u in class file %s",
 597           name_and_type_ref_index, CHECK);
 598         // bootstrap specifier index must be checked later,
 599         // when BootstrapMethods attr is available
 600 
 601         // Mark the constant pool as having a CONSTANT_Dynamic_info structure
 602         cp->set_has_dynamic_constant();
 603         break;
 604       }
 605       case JVM_CONSTANT_InvokeDynamic: {
 606         const int name_and_type_ref_index =
 607           cp->bootstrap_name_and_type_ref_index_at(index);
 608 
 609         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 610           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 611           "Invalid constant pool index %u in class file %s",
 612           name_and_type_ref_index, CHECK);
 613         // bootstrap specifier index must be checked later,
 614         // when BootstrapMethods attr is available
 615         break;
 616       }
 617       default: {
 618         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 619         ShouldNotReachHere();
 620         break;
 621       }
 622     } // switch(tag)
 623   } // end of for
 624 
 625   cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
 626 
 627   if (!_need_verify) {
 628     return;
 629   }
 630 
 631   // second verification pass - checks the strings are of the right format.
 632   // but not yet to the other entries
 633   for (index = 1; index < length; index++) {
 634     const jbyte tag = cp->tag_at(index).value();
 635     switch (tag) {
 636       case JVM_CONSTANT_UnresolvedClass: {
 637         const Symbol* const class_name = cp->klass_name_at(index);
 638         // check the name
 639         verify_legal_class_name(class_name, CHECK);
 640         break;
 641       }
 642       case JVM_CONSTANT_NameAndType: {
 643         if (_need_verify) {
 644           const int sig_index = cp->signature_ref_index_at(index);
 645           const int name_index = cp->name_ref_index_at(index);
 646           const Symbol* const name = cp->symbol_at(name_index);
 647           const Symbol* const sig = cp->symbol_at(sig_index);
 648           guarantee_property(sig->utf8_length() != 0,
 649             "Illegal zero length constant pool entry at %d in class %s",
 650             sig_index, CHECK);
 651           guarantee_property(name->utf8_length() != 0,
 652             "Illegal zero length constant pool entry at %d in class %s",
 653             name_index, CHECK);
 654 
 655           if (Signature::is_method(sig)) {
 656             // Format check method name and signature
 657             verify_legal_method_name(name, CHECK);
 658             verify_legal_method_signature(name, sig, CHECK);
 659           } else {
 660             // Format check field name and signature
 661             verify_legal_field_name(name, CHECK);
 662             verify_legal_field_signature(name, sig, CHECK);
 663           }
 664         }
 665         break;
 666       }
 667       case JVM_CONSTANT_Dynamic: {
 668         const int name_and_type_ref_index =
 669           cp->name_and_type_ref_index_at(index);
 670         // already verified to be utf8
 671         const int name_ref_index =
 672           cp->name_ref_index_at(name_and_type_ref_index);
 673         // already verified to be utf8
 674         const int signature_ref_index =
 675           cp->signature_ref_index_at(name_and_type_ref_index);
 676         const Symbol* const name = cp->symbol_at(name_ref_index);
 677         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 678         if (_need_verify) {
 679           // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
 680           // Need only to be sure signature is the right type.
 681           if (Signature::is_method(signature)) {
 682             throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
 683           }
 684         }
 685         break;
 686       }
 687       case JVM_CONSTANT_InvokeDynamic:
 688       case JVM_CONSTANT_Fieldref:
 689       case JVM_CONSTANT_Methodref:
 690       case JVM_CONSTANT_InterfaceMethodref: {
 691         const int name_and_type_ref_index =
 692           cp->name_and_type_ref_index_at(index);
 693         // already verified to be utf8
 694         const int name_ref_index =
 695           cp->name_ref_index_at(name_and_type_ref_index);
 696         // already verified to be utf8
 697         const int signature_ref_index =
 698           cp->signature_ref_index_at(name_and_type_ref_index);
 699         const Symbol* const name = cp->symbol_at(name_ref_index);
 700         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 701         if (tag == JVM_CONSTANT_Fieldref) {
 702           if (_need_verify) {
 703             // Field name and signature are verified above, when iterating NameAndType_info.
 704             // Need only to be sure signature is non-zero length and the right type.
 705             if (Signature::is_method(signature)) {
 706               throwIllegalSignature("Field", name, signature, CHECK);
 707             }
 708           }
 709         } else {
 710           if (_need_verify) {
 711             // Method name and signature are individually verified above, when iterating
 712             // NameAndType_info.  Need to check here that signature is non-zero length and
 713             // the right type.
 714             if (!Signature::is_method(signature)) {
 715               throwIllegalSignature("Method", name, signature, CHECK);
 716             }
 717           }
 718           // If a class method name begins with '<', it must be "<init>" and have void signature,
 719           // or if it is an inline type, <vnew> with return.
 720           const unsigned int name_len = name->utf8_length();
 721           if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
 722               name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
 723             if (name != vmSymbols::object_initializer_name() &&
 724                 name != vmSymbols::inline_factory_name()) {
 725               classfile_parse_error(
 726                 "Bad method name at constant pool index %u in class file %s",
 727                 name_ref_index, THREAD);
 728               return;
 729             } else if (!Signature::is_void_method(signature)) {
 730               // if return type is non-void then it must be an inline type
 731               if (name == vmSymbols::object_initializer_name() ||
 732                   !EnableValhalla || !supports_inline_types() ||
 733                   !signature->ends_with(JVM_SIGNATURE_ENDCLASS)) {
 734                 throwIllegalSignature("Method", name, signature, CHECK);
 735               }
 736             }
 737           }
 738         }
 739         break;
 740       }
 741       case JVM_CONSTANT_MethodHandle: {
 742         const int ref_index = cp->method_handle_index_at(index);
 743         const int ref_kind = cp->method_handle_ref_kind_at(index);
 744         switch (ref_kind) {
 745           case JVM_REF_invokeVirtual:
 746           case JVM_REF_invokeStatic:
 747           case JVM_REF_invokeSpecial:
 748           case JVM_REF_newInvokeSpecial: {
 749             const int name_and_type_ref_index =
 750               cp->name_and_type_ref_index_at(ref_index);
 751             const int name_ref_index =
 752               cp->name_ref_index_at(name_and_type_ref_index);
 753             const Symbol* const name = cp->symbol_at(name_ref_index);
 754 
 755             if (EnableValhalla && supports_inline_types() && name == vmSymbols::inline_factory_name()) { // <vnew>
 756               // <vnew> factory methods must be non-void return and invokeStatic.
 757               const int signature_ref_index =
 758                 cp->signature_ref_index_at(name_and_type_ref_index);
 759               const Symbol* const signature = cp->symbol_at(signature_ref_index);
 760               if (signature->is_void_method_signature() || ref_kind != JVM_REF_invokeStatic) {
 761                 classfile_parse_error(
 762                   "Bad factory method name at constant pool index %u in class file %s",
 763                   name_ref_index, CHECK);
 764               }
 765             } else if (name != vmSymbols::object_initializer_name()) { // !<init>
 766               if (ref_kind == JVM_REF_newInvokeSpecial) {
 767                 classfile_parse_error(
 768                   "Bad constructor name at constant pool index %u in class file %s",
 769                     name_ref_index, THREAD);
 770                 return;
 771               }
 772             } else { // <init>
 773               // The allowed invocation mode of <init> depends on its signature.
 774               // This test corresponds to verify_invoke_instructions in the verifier.
 775               const int signature_ref_index =
 776                 cp->signature_ref_index_at(name_and_type_ref_index);
 777               const Symbol* const signature = cp->symbol_at(signature_ref_index);
 778               if (signature->is_void_method_signature()
 779                   && ref_kind == JVM_REF_newInvokeSpecial) {
 780                 // OK, could be a constructor call
 781               } else {
 782                 classfile_parse_error(
 783                   "Bad method name at constant pool index %u in class file %s",
 784                   name_ref_index, THREAD);
 785                 return;
 786               }
 787             }
 788             break;
 789           }
 790           // Other ref_kinds are already fully checked in previous pass.
 791         } // switch(ref_kind)
 792         break;
 793       }
 794       case JVM_CONSTANT_MethodType: {
 795         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 796         const Symbol* const signature = cp->method_type_signature_at(index);
 797         verify_legal_method_signature(no_name, signature, CHECK);
 798         break;
 799       }
 800       case JVM_CONSTANT_Utf8: {
 801         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 802       }
 803     }  // switch(tag)
 804   }  // end of for
 805 }
 806 
 807 class NameSigHash: public ResourceObj {
 808  public:
 809   const Symbol*       _name;       // name
 810   const Symbol*       _sig;        // signature
 811   NameSigHash*  _next;             // Next entry in hash table
 812 };
 813 
 814 static const int HASH_ROW_SIZE = 256;
 815 
 816 static unsigned int hash(const Symbol* name, const Symbol* sig) {
 817   unsigned int raw_hash = 0;
 818   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 819   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 820 
 821   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 822 }
 823 
 824 
 825 static void initialize_hashtable(NameSigHash** table) {
 826   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 827 }
 828 // Return false if the name/sig combination is found in table.
 829 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 830 // The old format checker uses heap sort to find duplicates.
 831 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 832 // of table since we don't expect Symbol*'s to move.
 833 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
 834   assert(name != NULL, "name in constant pool is NULL");
 835 
 836   // First lookup for duplicates
 837   int index = hash(name, sig);
 838   NameSigHash* entry = table[index];
 839   while (entry != NULL) {
 840     if (entry->_name == name && entry->_sig == sig) {
 841       return false;
 842     }
 843     entry = entry->_next;
 844   }
 845 
 846   // No duplicate is found, allocate a new entry and fill it.
 847   entry = new NameSigHash();
 848   entry->_name = name;
 849   entry->_sig = sig;
 850 
 851   // Insert into hash table
 852   entry->_next = table[index];
 853   table[index] = entry;
 854 
 855   return true;
 856 }
 857 
 858 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
 859   assert(super_type != NULL,"Method doesn't support null super type");
 860   if (super_type->carries_identity_modifier()) {
 861     if (current->carries_value_modifier()) {
 862         ResourceMark rm(THREAD);
 863         Exceptions::fthrow(
 864           THREAD_AND_LOCATION,
 865           vmSymbols::java_lang_IncompatibleClassChangeError(),
 866           "Value type %s has an identity type as supertype",
 867           current->class_name()->as_klass_external_name());
 868         return;
 869       }
 870     current->set_carries_identity_modifier();
 871   }
 872   if (super_type->carries_value_modifier()) {
 873     if (current->carries_identity_modifier()) {
 874       ResourceMark rm(THREAD);
 875       Exceptions::fthrow(
 876         THREAD_AND_LOCATION,
 877         vmSymbols::java_lang_IncompatibleClassChangeError(),
 878         "Identity type %s has a value type as supertype",
 879         current->class_name()->as_klass_external_name());
 880       return;
 881     }
 882     current->set_carries_value_modifier();
 883   }
 884 }
 885 
 886 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
 887                                        int itfs_len,
 888                                        ConstantPool* cp,
 889                                        bool* const has_nonstatic_concrete_methods,
 890                                        // FIXME: lots of these functions
 891                                        // declare their parameters as const,
 892                                        // which adds only noise to the code.
 893                                        // Remove the spurious const modifiers.
 894                                        // Many are of the form "const int x"
 895                                        // or "T* const x".
 896                                        bool* const is_declared_atomic,
 897                                        TRAPS) {
 898   assert(stream != NULL, "invariant");
 899   assert(cp != NULL, "invariant");
 900   assert(has_nonstatic_concrete_methods != NULL, "invariant");
 901 
 902   if (itfs_len == 0) {
 903     _local_interfaces = Universe::the_empty_instance_klass_array();
 904 
 905   } else {
 906     assert(itfs_len > 0, "only called for len>0");
 907     _local_interface_indexes = new GrowableArray<u2>(itfs_len);
 908     int index = 0;
 909     for (index = 0; index < itfs_len; index++) {
 910       const u2 interface_index = stream->get_u2(CHECK);
 911       check_property(
 912         valid_klass_reference_at(interface_index),
 913         "Interface name has bad constant pool index %u in class file %s",
 914         interface_index, CHECK);
 915       _local_interface_indexes->at_put_grow(index, interface_index);
 916     }
 917 
 918     if (!_need_verify || itfs_len <= 1) {
 919       return;
 920     }
 921 
 922     // Check if there's any duplicates in interfaces
 923     ResourceMark rm(THREAD);
 924     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
 925                                                                  NameSigHash*,
 926                                                                  HASH_ROW_SIZE);
 927     initialize_hashtable(interface_names);
 928     bool dup = false;
 929     const Symbol* name = NULL;
 930     {
 931       debug_only(NoSafepointVerifier nsv;)
 932       for (index = 0; index < itfs_len; index++) {
 933         name = cp->klass_name_at(_local_interface_indexes->at(index));
 934         // If no duplicates, add (name, NULL) in hashtable interface_names.
 935         if (!put_after_lookup(name, NULL, interface_names)) {
 936           dup = true;
 937           break;
 938         }
 939       }
 940     }
 941     if (dup) {
 942       classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
 943                              name->as_C_string(), THREAD);
 944     }
 945   }
 946 }
 947 
 948 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 949                                            int constantvalue_index,
 950                                            int signature_index,
 951                                            TRAPS) const {
 952   // Make sure the constant pool entry is of a type appropriate to this field
 953   guarantee_property(
 954     (constantvalue_index > 0 &&
 955       constantvalue_index < cp->length()),
 956     "Bad initial value index %u in ConstantValue attribute in class file %s",
 957     constantvalue_index, CHECK);
 958 
 959   const constantTag value_type = cp->tag_at(constantvalue_index);
 960   switch(cp->basic_type_for_signature_at(signature_index)) {
 961     case T_LONG: {
 962       guarantee_property(value_type.is_long(),
 963                          "Inconsistent constant value type in class file %s",
 964                          CHECK);
 965       break;
 966     }
 967     case T_FLOAT: {
 968       guarantee_property(value_type.is_float(),
 969                          "Inconsistent constant value type in class file %s",
 970                          CHECK);
 971       break;
 972     }
 973     case T_DOUBLE: {
 974       guarantee_property(value_type.is_double(),
 975                          "Inconsistent constant value type in class file %s",
 976                          CHECK);
 977       break;
 978     }
 979     case T_BYTE:
 980     case T_CHAR:
 981     case T_SHORT:
 982     case T_BOOLEAN:
 983     case T_INT: {
 984       guarantee_property(value_type.is_int(),
 985                          "Inconsistent constant value type in class file %s",
 986                          CHECK);
 987       break;
 988     }
 989     case T_OBJECT: {
 990       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 991                          && value_type.is_string()),
 992                          "Bad string initial value in class file %s",
 993                          CHECK);
 994       break;
 995     }
 996     default: {
 997       classfile_parse_error("Unable to set initial value %u in class file %s",
 998                              constantvalue_index,
 999                              THREAD);
1000     }
1001   }
1002 }
1003 
1004 class AnnotationCollector : public ResourceObj{
1005 public:
1006   enum Location { _in_field, _in_method, _in_class };
1007   enum ID {
1008     _unknown = 0,
1009     _method_CallerSensitive,
1010     _method_ForceInline,
1011     _method_DontInline,
1012     _method_ChangesCurrentThread,
1013     _method_JvmtiMountTransition,
1014     _method_InjectedProfile,
1015     _method_LambdaForm_Compiled,
1016     _method_Hidden,
1017     _method_Scoped,
1018     _method_IntrinsicCandidate,
1019     _jdk_internal_vm_annotation_Contended,
1020     _field_Stable,
1021     _jdk_internal_vm_annotation_ReservedStackAccess,
1022     _jdk_internal_ValueBased,
1023     _annotation_LIMIT
1024   };
1025   const Location _location;
1026   int _annotations_present;
1027   u2 _contended_group;
1028 
1029   AnnotationCollector(Location location)
1030     : _location(location), _annotations_present(0), _contended_group(0)
1031   {
1032     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1033   }
1034   // If this annotation name has an ID, report it (or _none).
1035   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
1036   // Set the annotation name:
1037   void set_annotation(ID id) {
1038     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1039     _annotations_present |= nth_bit((int)id);
1040   }
1041 
1042   void remove_annotation(ID id) {
1043     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1044     _annotations_present &= ~nth_bit((int)id);
1045   }
1046 
1047   // Report if the annotation is present.
1048   bool has_any_annotations() const { return _annotations_present != 0; }
1049   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1050 
1051   void set_contended_group(u2 group) { _contended_group = group; }
1052   u2 contended_group() const { return _contended_group; }
1053 
1054   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1055 
1056   void set_stable(bool stable) { set_annotation(_field_Stable); }
1057   bool is_stable() const { return has_annotation(_field_Stable); }
1058 };
1059 
1060 // This class also doubles as a holder for metadata cleanup.
1061 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1062 private:
1063   ClassLoaderData* _loader_data;
1064   AnnotationArray* _field_annotations;
1065   AnnotationArray* _field_type_annotations;
1066 public:
1067   FieldAnnotationCollector(ClassLoaderData* loader_data) :
1068     AnnotationCollector(_in_field),
1069     _loader_data(loader_data),
1070     _field_annotations(NULL),
1071     _field_type_annotations(NULL) {}
1072   ~FieldAnnotationCollector();
1073   void apply_to(FieldInfo* f);
1074   AnnotationArray* field_annotations()      { return _field_annotations; }
1075   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1076 
1077   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
1078   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1079 };
1080 
1081 class MethodAnnotationCollector : public AnnotationCollector{
1082 public:
1083   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1084   void apply_to(const methodHandle& m);
1085 };
1086 
1087 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1088 public:
1089   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1090   void apply_to(InstanceKlass* ik);
1091 };
1092 
1093 
1094 static int skip_annotation_value(const u1*, int, int); // fwd decl
1095 
1096 // Safely increment index by val if does not pass limit
1097 #define SAFE_ADD(index, limit, val) \
1098 if (index >= limit - val) return limit; \
1099 index += val;
1100 
1101 // Skip an annotation.  Return >=limit if there is any problem.
1102 static int skip_annotation(const u1* buffer, int limit, int index) {
1103   assert(buffer != NULL, "invariant");
1104   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1105   // value := switch (tag:u1) { ... }
1106   SAFE_ADD(index, limit, 4); // skip atype and read nmem
1107   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1108   while (--nmem >= 0 && index < limit) {
1109     SAFE_ADD(index, limit, 2); // skip member
1110     index = skip_annotation_value(buffer, limit, index);
1111   }
1112   return index;
1113 }
1114 
1115 // Skip an annotation value.  Return >=limit if there is any problem.
1116 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1117   assert(buffer != NULL, "invariant");
1118 
1119   // value := switch (tag:u1) {
1120   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1121   //   case e: e_class:u2 e_name:u2;
1122   //   case s: s_con:u2;
1123   //   case [: do(nval:u2) {value};
1124   //   case @: annotation;
1125   //   case s: s_con:u2;
1126   // }
1127   SAFE_ADD(index, limit, 1); // read tag
1128   const u1 tag = buffer[index - 1];
1129   switch (tag) {
1130     case 'B':
1131     case 'C':
1132     case 'I':
1133     case 'S':
1134     case 'Z':
1135     case 'D':
1136     case 'F':
1137     case 'J':
1138     case 'c':
1139     case 's':
1140       SAFE_ADD(index, limit, 2);  // skip con or s_con
1141       break;
1142     case 'e':
1143       SAFE_ADD(index, limit, 4);  // skip e_class, e_name
1144       break;
1145     case '[':
1146     {
1147       SAFE_ADD(index, limit, 2); // read nval
1148       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1149       while (--nval >= 0 && index < limit) {
1150         index = skip_annotation_value(buffer, limit, index);
1151       }
1152     }
1153     break;
1154     case '@':
1155       index = skip_annotation(buffer, limit, index);
1156       break;
1157     default:
1158       return limit;  //  bad tag byte
1159   }
1160   return index;
1161 }
1162 
1163 // Sift through annotations, looking for those significant to the VM:
1164 static void parse_annotations(const ConstantPool* const cp,
1165                               const u1* buffer, int limit,
1166                               AnnotationCollector* coll,
1167                               ClassLoaderData* loader_data,
1168                               const bool can_access_vm_annotations) {
1169 
1170   assert(cp != NULL, "invariant");
1171   assert(buffer != NULL, "invariant");
1172   assert(coll != NULL, "invariant");
1173   assert(loader_data != NULL, "invariant");
1174 
1175   // annotations := do(nann:u2) {annotation}
1176   int index = 2; // read nann
1177   if (index >= limit)  return;
1178   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1179   enum {  // initial annotation layout
1180     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1181     count_off = 2,      // u2   such as 1 (one value)
1182     member_off = 4,     // utf8 such as 'value'
1183     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1184     e_tag_val = 'e',
1185     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1186     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1187     e_size = 11,     // end of 'e' annotation
1188     c_tag_val = 'c',    // payload is type
1189     c_con_off = 7,    // utf8 payload, such as 'I'
1190     c_size = 9,       // end of 'c' annotation
1191     s_tag_val = 's',    // payload is String
1192     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1193     s_size = 9,
1194     min_size = 6        // smallest possible size (zero members)
1195   };
1196   // Cannot add min_size to index in case of overflow MAX_INT
1197   while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1198     int index0 = index;
1199     index = skip_annotation(buffer, limit, index);
1200     const u1* const abase = buffer + index0;
1201     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1202     const int count = Bytes::get_Java_u2((address)abase + count_off);
1203     const Symbol* const aname = check_symbol_at(cp, atype);
1204     if (aname == NULL)  break;  // invalid annotation name
1205     const Symbol* member = NULL;
1206     if (count >= 1) {
1207       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1208       member = check_symbol_at(cp, member_index);
1209       if (member == NULL)  break;  // invalid member name
1210     }
1211 
1212     // Here is where parsing particular annotations will take place.
1213     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1214     if (AnnotationCollector::_unknown == id)  continue;
1215     coll->set_annotation(id);
1216 
1217     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1218       // @Contended can optionally specify the contention group.
1219       //
1220       // Contended group defines the equivalence class over the fields:
1221       // the fields within the same contended group are not treated distinct.
1222       // The only exception is default group, which does not incur the
1223       // equivalence. Naturally, contention group for classes is meaningless.
1224       //
1225       // While the contention group is specified as String, annotation
1226       // values are already interned, and we might as well use the constant
1227       // pool index as the group tag.
1228       //
1229       u2 group_index = 0; // default contended group
1230       if (count == 1
1231         && s_size == (index - index0)  // match size
1232         && s_tag_val == *(abase + tag_off)
1233         && member == vmSymbols::value_name()) {
1234         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1235         if (cp->symbol_at(group_index)->utf8_length() == 0) {
1236           group_index = 0; // default contended group
1237         }
1238       }
1239       coll->set_contended_group(group_index);
1240     }
1241   }
1242 }
1243 
1244 
1245 // Parse attributes for a field.
1246 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1247                                              u2 attributes_count,
1248                                              bool is_static, u2 signature_index,
1249                                              u2* const constantvalue_index_addr,
1250                                              bool* const is_synthetic_addr,
1251                                              u2* const generic_signature_index_addr,
1252                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1253                                              TRAPS) {
1254   assert(cfs != NULL, "invariant");
1255   assert(constantvalue_index_addr != NULL, "invariant");
1256   assert(is_synthetic_addr != NULL, "invariant");
1257   assert(generic_signature_index_addr != NULL, "invariant");
1258   assert(parsed_annotations != NULL, "invariant");
1259   assert(attributes_count > 0, "attributes_count should be greater than 0");
1260 
1261   u2 constantvalue_index = 0;
1262   u2 generic_signature_index = 0;
1263   bool is_synthetic = false;
1264   const u1* runtime_visible_annotations = NULL;
1265   int runtime_visible_annotations_length = 0;
1266   const u1* runtime_invisible_annotations = NULL;
1267   int runtime_invisible_annotations_length = 0;
1268   const u1* runtime_visible_type_annotations = NULL;
1269   int runtime_visible_type_annotations_length = 0;
1270   const u1* runtime_invisible_type_annotations = NULL;
1271   int runtime_invisible_type_annotations_length = 0;
1272   bool runtime_invisible_annotations_exists = false;
1273   bool runtime_invisible_type_annotations_exists = false;
1274   const ConstantPool* const cp = _cp;
1275 
1276   while (attributes_count--) {
1277     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1278     const u2 attribute_name_index = cfs->get_u2_fast();
1279     const u4 attribute_length = cfs->get_u4_fast();
1280     check_property(valid_symbol_at(attribute_name_index),
1281                    "Invalid field attribute index %u in class file %s",
1282                    attribute_name_index,
1283                    CHECK);
1284 
1285     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1286     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1287       // ignore if non-static
1288       if (constantvalue_index != 0) {
1289         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1290         return;
1291       }
1292       check_property(
1293         attribute_length == 2,
1294         "Invalid ConstantValue field attribute length %u in class file %s",
1295         attribute_length, CHECK);
1296 
1297       constantvalue_index = cfs->get_u2(CHECK);
1298       if (_need_verify) {
1299         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1300       }
1301     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1302       if (attribute_length != 0) {
1303         classfile_parse_error(
1304           "Invalid Synthetic field attribute length %u in class file %s",
1305           attribute_length, THREAD);
1306         return;
1307       }
1308       is_synthetic = true;
1309     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1310       if (attribute_length != 0) {
1311         classfile_parse_error(
1312           "Invalid Deprecated field attribute length %u in class file %s",
1313           attribute_length, THREAD);
1314         return;
1315       }
1316     } else if (_major_version >= JAVA_1_5_VERSION) {
1317       if (attribute_name == vmSymbols::tag_signature()) {
1318         if (generic_signature_index != 0) {
1319           classfile_parse_error(
1320             "Multiple Signature attributes for field in class file %s", THREAD);
1321           return;
1322         }
1323         if (attribute_length != 2) {
1324           classfile_parse_error(
1325             "Wrong size %u for field's Signature attribute in class file %s",
1326             attribute_length, THREAD);
1327           return;
1328         }
1329         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1330       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1331         if (runtime_visible_annotations != NULL) {
1332           classfile_parse_error(
1333             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1334           return;
1335         }
1336         runtime_visible_annotations_length = attribute_length;
1337         runtime_visible_annotations = cfs->current();
1338         assert(runtime_visible_annotations != NULL, "null visible annotations");
1339         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1340         parse_annotations(cp,
1341                           runtime_visible_annotations,
1342                           runtime_visible_annotations_length,
1343                           parsed_annotations,
1344                           _loader_data,
1345                           _can_access_vm_annotations);
1346         cfs->skip_u1_fast(runtime_visible_annotations_length);
1347       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1348         if (runtime_invisible_annotations_exists) {
1349           classfile_parse_error(
1350             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1351           return;
1352         }
1353         runtime_invisible_annotations_exists = true;
1354         if (PreserveAllAnnotations) {
1355           runtime_invisible_annotations_length = attribute_length;
1356           runtime_invisible_annotations = cfs->current();
1357           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1358         }
1359         cfs->skip_u1(attribute_length, CHECK);
1360       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1361         if (runtime_visible_type_annotations != NULL) {
1362           classfile_parse_error(
1363             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1364           return;
1365         }
1366         runtime_visible_type_annotations_length = attribute_length;
1367         runtime_visible_type_annotations = cfs->current();
1368         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1369         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1370       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1371         if (runtime_invisible_type_annotations_exists) {
1372           classfile_parse_error(
1373             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1374           return;
1375         } else {
1376           runtime_invisible_type_annotations_exists = true;
1377         }
1378         if (PreserveAllAnnotations) {
1379           runtime_invisible_type_annotations_length = attribute_length;
1380           runtime_invisible_type_annotations = cfs->current();
1381           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1382         }
1383         cfs->skip_u1(attribute_length, CHECK);
1384       } else {
1385         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1386       }
1387     } else {
1388       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1389     }
1390   }
1391 
1392   *constantvalue_index_addr = constantvalue_index;
1393   *is_synthetic_addr = is_synthetic;
1394   *generic_signature_index_addr = generic_signature_index;
1395   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1396                                             runtime_visible_annotations_length,
1397                                             runtime_invisible_annotations,
1398                                             runtime_invisible_annotations_length,
1399                                             CHECK);
1400   parsed_annotations->set_field_annotations(a);
1401   a = assemble_annotations(runtime_visible_type_annotations,
1402                            runtime_visible_type_annotations_length,
1403                            runtime_invisible_type_annotations,
1404                            runtime_invisible_type_annotations_length,
1405                            CHECK);
1406   parsed_annotations->set_field_type_annotations(a);
1407   return;
1408 }
1409 
1410 
1411 // Field allocation types. Used for computing field offsets.
1412 
1413 enum FieldAllocationType {
1414   STATIC_OOP,           // Oops
1415   STATIC_BYTE,          // Boolean, Byte, char
1416   STATIC_SHORT,         // shorts
1417   STATIC_WORD,          // ints
1418   STATIC_DOUBLE,        // aligned long or double
1419   STATIC_INLINE,        // inline type field
1420   NONSTATIC_OOP,
1421   NONSTATIC_BYTE,
1422   NONSTATIC_SHORT,
1423   NONSTATIC_WORD,
1424   NONSTATIC_DOUBLE,
1425   NONSTATIC_INLINE,
1426   MAX_FIELD_ALLOCATION_TYPE,
1427   BAD_ALLOCATION_TYPE = -1
1428 };
1429 
1430 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1431   BAD_ALLOCATION_TYPE, // 0
1432   BAD_ALLOCATION_TYPE, // 1
1433   BAD_ALLOCATION_TYPE, // 2
1434   BAD_ALLOCATION_TYPE, // 3
1435   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1436   NONSTATIC_SHORT,     // T_CHAR        =  5,
1437   NONSTATIC_WORD,      // T_FLOAT       =  6,
1438   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1439   NONSTATIC_BYTE,      // T_BYTE        =  8,
1440   NONSTATIC_SHORT,     // T_SHORT       =  9,
1441   NONSTATIC_WORD,      // T_INT         = 10,
1442   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1443   NONSTATIC_OOP,       // T_OBJECT      = 12,
1444   NONSTATIC_OOP,       // T_ARRAY       = 13,
1445   NONSTATIC_OOP,       // T_PRIMITIVE_OBJECT = 14,
1446   BAD_ALLOCATION_TYPE, // T_VOID        = 15,
1447   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 16,
1448   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 17,
1449   BAD_ALLOCATION_TYPE, // T_METADATA    = 18,
1450   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1451   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 20,
1452   BAD_ALLOCATION_TYPE, // 0
1453   BAD_ALLOCATION_TYPE, // 1
1454   BAD_ALLOCATION_TYPE, // 2
1455   BAD_ALLOCATION_TYPE, // 3
1456   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1457   STATIC_SHORT,        // T_CHAR        =  5,
1458   STATIC_WORD,         // T_FLOAT       =  6,
1459   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1460   STATIC_BYTE,         // T_BYTE        =  8,
1461   STATIC_SHORT,        // T_SHORT       =  9,
1462   STATIC_WORD,         // T_INT         = 10,
1463   STATIC_DOUBLE,       // T_LONG        = 11,
1464   STATIC_OOP,          // T_OBJECT      = 12,
1465   STATIC_OOP,          // T_ARRAY       = 13,
1466   STATIC_OOP,          // T_PRIMITIVE_OBJECT = 14,
1467   BAD_ALLOCATION_TYPE, // T_VOID        = 15,
1468   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 16,
1469   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 17,
1470   BAD_ALLOCATION_TYPE, // T_METADATA    = 18,
1471   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1472   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 20
1473 };
1474 
1475 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_inline_type) {
1476   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1477   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1478   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1479   if (is_inline_type) {
1480     result = is_static ? STATIC_INLINE : NONSTATIC_INLINE;
1481   }
1482   return result;
1483 }
1484 
1485 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1486  public:
1487   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1488 
1489   FieldAllocationCount() {
1490     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1491       count[i] = 0;
1492     }
1493   }
1494 
1495   void update(bool is_static, BasicType type, bool is_inline_type) {
1496     FieldAllocationType atype = basic_type_to_atype(is_static, type, is_inline_type);
1497     if (atype != BAD_ALLOCATION_TYPE) {
1498       // Make sure there is no overflow with injected fields.
1499       assert(count[atype] < 0xFFFF, "More than 65535 fields");
1500       count[atype]++;
1501     }
1502   }
1503 };
1504 
1505 // Side-effects: populates the _fields, _fields_annotations,
1506 // _fields_type_annotations fields
1507 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1508                                    AccessFlags class_access_flags,
1509                                    FieldAllocationCount* const fac,
1510                                    ConstantPool* cp,
1511                                    const int cp_size,
1512                                    u2* const java_fields_count_ptr,
1513                                    TRAPS) {
1514 
1515   assert(cfs != NULL, "invariant");
1516   assert(fac != NULL, "invariant");
1517   assert(cp != NULL, "invariant");
1518   assert(java_fields_count_ptr != NULL, "invariant");
1519 
1520   assert(NULL == _fields, "invariant");
1521   assert(NULL == _fields_annotations, "invariant");
1522   assert(NULL == _fields_type_annotations, "invariant");
1523 
1524   bool is_inline_type = class_access_flags.is_value_class() && !class_access_flags.is_abstract();
1525   cfs->guarantee_more(2, CHECK);  // length
1526   const u2 length = cfs->get_u2_fast();
1527   *java_fields_count_ptr = length;
1528 
1529   int num_injected = 0;
1530   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1531                                                                   &num_injected);
1532 
1533   // two more slots are required for inline classes:
1534   // one for the static field with a reference to the pre-allocated default value
1535   // one for the field the JVM injects when detecting an empty inline class
1536   const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1537 
1538   // The field array starts with tuples of shorts
1539   // [access, name index, sig index, initial value index, byte offset].
1540   // A generic signature slot only exists for field with generic
1541   // signature attribute. And the access flag is set with
1542   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1543   // signature slots are at the end of the field array and after all
1544   // other fields data.
1545   //
1546   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1547   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1548   //       ...
1549   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1550   //       [generic signature index]
1551   //       [generic signature index]
1552   //       ...
1553   //
1554   // Allocate a temporary resource array for field data. For each field,
1555   // a slot is reserved in the temporary array for the generic signature
1556   // index. After parsing all fields, the data are copied to a permanent
1557   // array and any unused slots will be discarded.
1558   ResourceMark rm(THREAD);
1559   u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1560                                               u2,
1561                                               total_fields * (FieldInfo::field_slots + 1));
1562 
1563   // The generic signature slots start after all other fields' data.
1564   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1565   int num_generic_signature = 0;
1566   int instance_fields_count = 0;
1567   for (int n = 0; n < length; n++) {
1568     // access_flags, name_index, descriptor_index, attributes_count
1569     cfs->guarantee_more(8, CHECK);
1570 
1571     jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1572 
1573     const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1574     verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1575     AccessFlags access_flags;
1576     access_flags.set_flags(flags);
1577 
1578     const u2 name_index = cfs->get_u2_fast();
1579     check_property(valid_symbol_at(name_index),
1580       "Invalid constant pool index %u for field name in class file %s",
1581       name_index, CHECK);
1582     const Symbol* const name = cp->symbol_at(name_index);
1583     verify_legal_field_name(name, CHECK);
1584 
1585     const u2 signature_index = cfs->get_u2_fast();
1586     check_property(valid_symbol_at(signature_index),
1587       "Invalid constant pool index %u for field signature in class file %s",
1588       signature_index, CHECK);
1589     const Symbol* const sig = cp->symbol_at(signature_index);
1590     verify_legal_field_signature(name, sig, CHECK);
1591     if (!access_flags.is_static()) instance_fields_count++;
1592 
1593     u2 constantvalue_index = 0;
1594     bool is_synthetic = false;
1595     u2 generic_signature_index = 0;
1596     const bool is_static = access_flags.is_static();
1597     FieldAnnotationCollector parsed_annotations(_loader_data);
1598 
1599     const u2 attributes_count = cfs->get_u2_fast();
1600     if (attributes_count > 0) {
1601       parse_field_attributes(cfs,
1602                              attributes_count,
1603                              is_static,
1604                              signature_index,
1605                              &constantvalue_index,
1606                              &is_synthetic,
1607                              &generic_signature_index,
1608                              &parsed_annotations,
1609                              CHECK);
1610 
1611       if (parsed_annotations.field_annotations() != NULL) {
1612         if (_fields_annotations == NULL) {
1613           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1614                                              _loader_data, length, NULL,
1615                                              CHECK);
1616         }
1617         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1618         parsed_annotations.set_field_annotations(NULL);
1619       }
1620       if (parsed_annotations.field_type_annotations() != NULL) {
1621         if (_fields_type_annotations == NULL) {
1622           _fields_type_annotations =
1623             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1624                                                          length,
1625                                                          NULL,
1626                                                          CHECK);
1627         }
1628         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1629         parsed_annotations.set_field_type_annotations(NULL);
1630       }
1631 
1632       if (is_synthetic) {
1633         access_flags.set_is_synthetic();
1634       }
1635       if (generic_signature_index != 0) {
1636         access_flags.set_field_has_generic_signature();
1637         fa[generic_signature_slot] = generic_signature_index;
1638         generic_signature_slot ++;
1639         num_generic_signature ++;
1640       }
1641     }
1642 
1643     FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1644     field->initialize(access_flags.as_short(),
1645                       name_index,
1646                       signature_index,
1647                       constantvalue_index);
1648     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1649 
1650     // Update FieldAllocationCount for this kind of field
1651     fac->update(is_static, type, type == T_PRIMITIVE_OBJECT);
1652 
1653     // After field is initialized with type, we can augment it with aux info
1654     if (parsed_annotations.has_any_annotations()) {
1655       parsed_annotations.apply_to(field);
1656       if (field->is_contended()) {
1657         _has_contended_fields = true;
1658       }
1659     }
1660   }
1661 
1662   int index = length;
1663   if (num_injected != 0) {
1664     for (int n = 0; n < num_injected; n++) {
1665       // Check for duplicates
1666       if (injected[n].may_be_java) {
1667         const Symbol* const name      = injected[n].name();
1668         const Symbol* const signature = injected[n].signature();
1669         bool duplicate = false;
1670         for (int i = 0; i < length; i++) {
1671           const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1672           if (name      == cp->symbol_at(f->name_index()) &&
1673               signature == cp->symbol_at(f->signature_index())) {
1674             // Symbol is desclared in Java so skip this one
1675             duplicate = true;
1676             break;
1677           }
1678         }
1679         if (duplicate) {
1680           // These will be removed from the field array at the end
1681           continue;
1682         }
1683       }
1684 
1685       // Injected field
1686       FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1687       field->initialize((u2)JVM_ACC_FIELD_INTERNAL,
1688                         (u2)(injected[n].name_index),
1689                         (u2)(injected[n].signature_index),
1690                         0);
1691 
1692       const BasicType type = Signature::basic_type(injected[n].signature());
1693 
1694       // Update FieldAllocationCount for this kind of field
1695       fac->update(false, type, false);
1696       index++;
1697     }
1698   }
1699 
1700   if (is_inline_type) {
1701     FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1702     field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1703                       (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1704                       (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1705                       0);
1706     const BasicType type = Signature::basic_type(vmSymbols::object_signature());
1707     fac->update(true, type, false);
1708     index++;
1709   }
1710 
1711   if (is_inline_type && instance_fields_count == 0) {
1712     _is_empty_inline_type = true;
1713     FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1714     field->initialize(JVM_ACC_FIELD_INTERNAL,
1715         (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(empty_marker_name)),
1716         (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(byte_signature)),
1717         0);
1718     const BasicType type = Signature::basic_type(vmSymbols::byte_signature());
1719     fac->update(false, type, false);
1720     index++;
1721   }
1722 
1723   if (instance_fields_count > 0) {
1724     _has_nonstatic_fields = true;
1725   }
1726 
1727   assert(NULL == _fields, "invariant");
1728 
1729   _fields =
1730     MetadataFactory::new_array<u2>(_loader_data,
1731                                    index * FieldInfo::field_slots + num_generic_signature,
1732                                    CHECK);
1733   // Sometimes injected fields already exist in the Java source so
1734   // the fields array could be too long.  In that case the
1735   // fields array is trimmed. Also unused slots that were reserved
1736   // for generic signature indexes are discarded.
1737   {
1738     int i = 0;
1739     for (; i < index * FieldInfo::field_slots; i++) {
1740       _fields->at_put(i, fa[i]);
1741     }
1742     for (int j = total_fields * FieldInfo::field_slots;
1743          j < generic_signature_slot; j++) {
1744       _fields->at_put(i++, fa[j]);
1745     }
1746     assert(_fields->length() == i, "");
1747   }
1748 
1749   if (_need_verify && length > 1) {
1750     // Check duplicated fields
1751     ResourceMark rm(THREAD);
1752     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1753       THREAD, NameSigHash*, HASH_ROW_SIZE);
1754     initialize_hashtable(names_and_sigs);
1755     bool dup = false;
1756     const Symbol* name = NULL;
1757     const Symbol* sig = NULL;
1758     {
1759       debug_only(NoSafepointVerifier nsv;)
1760       for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1761         name = fs.name();
1762         sig = fs.signature();
1763         // If no duplicates, add name/signature in hashtable names_and_sigs.
1764         if (!put_after_lookup(name, sig, names_and_sigs)) {
1765           dup = true;
1766           break;
1767         }
1768       }
1769     }
1770     if (dup) {
1771       classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1772                              name->as_C_string(), sig->as_klass_external_name(), THREAD);
1773     }
1774   }
1775 }
1776 
1777 
1778 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1779                                                                          u4 code_length,
1780                                                                          u4 exception_table_length,
1781                                                                          TRAPS) {
1782   assert(cfs != NULL, "invariant");
1783 
1784   const unsafe_u2* const exception_table_start = cfs->current();
1785   assert(exception_table_start != NULL, "null exception table");
1786 
1787   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1788                                                                // end_pc,
1789                                                                // handler_pc,
1790                                                                // catch_type_index
1791 
1792   // Will check legal target after parsing code array in verifier.
1793   if (_need_verify) {
1794     for (unsigned int i = 0; i < exception_table_length; i++) {
1795       const u2 start_pc = cfs->get_u2_fast();
1796       const u2 end_pc = cfs->get_u2_fast();
1797       const u2 handler_pc = cfs->get_u2_fast();
1798       const u2 catch_type_index = cfs->get_u2_fast();
1799       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1800                          "Illegal exception table range in class file %s",
1801                          CHECK_NULL);
1802       guarantee_property(handler_pc < code_length,
1803                          "Illegal exception table handler in class file %s",
1804                          CHECK_NULL);
1805       if (catch_type_index != 0) {
1806         guarantee_property(valid_klass_reference_at(catch_type_index),
1807                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1808       }
1809     }
1810   } else {
1811     cfs->skip_u2_fast(exception_table_length * 4);
1812   }
1813   return exception_table_start;
1814 }
1815 
1816 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1817                                              u4 code_length,
1818                                              CompressedLineNumberWriteStream**const write_stream,
1819                                              TRAPS) {
1820 
1821   const ClassFileStream* const cfs = _stream;
1822   unsigned int num_entries = cfs->get_u2(CHECK);
1823 
1824   // Each entry is a u2 start_pc, and a u2 line_number
1825   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1826 
1827   // Verify line number attribute and table length
1828   check_property(
1829     code_attribute_length == sizeof(u2) + length_in_bytes,
1830     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1831 
1832   cfs->guarantee_more(length_in_bytes, CHECK);
1833 
1834   if ((*write_stream) == NULL) {
1835     if (length_in_bytes > fixed_buffer_size) {
1836       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1837     } else {
1838       (*write_stream) = new CompressedLineNumberWriteStream(
1839         _linenumbertable_buffer, fixed_buffer_size);
1840     }
1841   }
1842 
1843   while (num_entries-- > 0) {
1844     const u2 bci  = cfs->get_u2_fast(); // start_pc
1845     const u2 line = cfs->get_u2_fast(); // line_number
1846     guarantee_property(bci < code_length,
1847         "Invalid pc in LineNumberTable in class file %s", CHECK);
1848     (*write_stream)->write_pair(bci, line);
1849   }
1850 }
1851 
1852 
1853 class LVT_Hash : public AllStatic {
1854  public:
1855 
1856   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1857   /*
1858    * 3-tuple start_bci/length/slot has to be unique key,
1859    * so the following comparison seems to be redundant:
1860    *       && elem->name_cp_index == entry->_elem->name_cp_index
1861    */
1862     return (e0.start_bci     == e1.start_bci &&
1863             e0.length        == e1.length &&
1864             e0.name_cp_index == e1.name_cp_index &&
1865             e0.slot          == e1.slot);
1866   }
1867 
1868   static unsigned int hash(LocalVariableTableElement const& e0) {
1869     unsigned int raw_hash = e0.start_bci;
1870 
1871     raw_hash = e0.length        + raw_hash * 37;
1872     raw_hash = e0.name_cp_index + raw_hash * 37;
1873     raw_hash = e0.slot          + raw_hash * 37;
1874 
1875     return raw_hash;
1876   }
1877 };
1878 
1879 
1880 // Class file LocalVariableTable elements.
1881 class Classfile_LVT_Element {
1882  public:
1883   u2 start_bci;
1884   u2 length;
1885   u2 name_cp_index;
1886   u2 descriptor_cp_index;
1887   u2 slot;
1888 };
1889 
1890 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1891                              LocalVariableTableElement* const lvt) {
1892   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1893   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1894   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1895   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1896   lvt->signature_cp_index  = 0;
1897   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1898 }
1899 
1900 // Function is used to parse both attributes:
1901 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1902 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1903                                                                              u4 code_length,
1904                                                                              u2 max_locals,
1905                                                                              u4 code_attribute_length,
1906                                                                              u2* const localvariable_table_length,
1907                                                                              bool isLVTT,
1908                                                                              TRAPS) {
1909   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1910   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1911   const unsigned int size =
1912     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1913 
1914   const ConstantPool* const cp = _cp;
1915 
1916   // Verify local variable table attribute has right length
1917   if (_need_verify) {
1918     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1919                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1920   }
1921 
1922   const unsafe_u2* const localvariable_table_start = cfs->current();
1923   assert(localvariable_table_start != NULL, "null local variable table");
1924   if (!_need_verify) {
1925     cfs->skip_u2_fast(size);
1926   } else {
1927     cfs->guarantee_more(size * 2, CHECK_NULL);
1928     for(int i = 0; i < (*localvariable_table_length); i++) {
1929       const u2 start_pc = cfs->get_u2_fast();
1930       const u2 length = cfs->get_u2_fast();
1931       const u2 name_index = cfs->get_u2_fast();
1932       const u2 descriptor_index = cfs->get_u2_fast();
1933       const u2 index = cfs->get_u2_fast();
1934       // Assign to a u4 to avoid overflow
1935       const u4 end_pc = (u4)start_pc + (u4)length;
1936 
1937       if (start_pc >= code_length) {
1938         classfile_parse_error(
1939           "Invalid start_pc %u in %s in class file %s",
1940           start_pc, tbl_name, THREAD);
1941         return NULL;
1942       }
1943       if (end_pc > code_length) {
1944         classfile_parse_error(
1945           "Invalid length %u in %s in class file %s",
1946           length, tbl_name, THREAD);
1947         return NULL;
1948       }
1949       const int cp_size = cp->length();
1950       guarantee_property(valid_symbol_at(name_index),
1951         "Name index %u in %s has bad constant type in class file %s",
1952         name_index, tbl_name, CHECK_NULL);
1953       guarantee_property(valid_symbol_at(descriptor_index),
1954         "Signature index %u in %s has bad constant type in class file %s",
1955         descriptor_index, tbl_name, CHECK_NULL);
1956 
1957       const Symbol* const name = cp->symbol_at(name_index);
1958       const Symbol* const sig = cp->symbol_at(descriptor_index);
1959       verify_legal_field_name(name, CHECK_NULL);
1960       u2 extra_slot = 0;
1961       if (!isLVTT) {
1962         verify_legal_field_signature(name, sig, CHECK_NULL);
1963 
1964         // 4894874: check special cases for double and long local variables
1965         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1966             sig == vmSymbols::type_signature(T_LONG)) {
1967           extra_slot = 1;
1968         }
1969       }
1970       guarantee_property((index + extra_slot) < max_locals,
1971                           "Invalid index %u in %s in class file %s",
1972                           index, tbl_name, CHECK_NULL);
1973     }
1974   }
1975   return localvariable_table_start;
1976 }
1977 
1978 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1979                                       u4 code_attribute_length,
1980                                       bool need_verify,
1981                                       TRAPS) {
1982   assert(cfs != NULL, "invariant");
1983 
1984   if (0 == code_attribute_length) {
1985     return NULL;
1986   }
1987 
1988   const u1* const stackmap_table_start = cfs->current();
1989   assert(stackmap_table_start != NULL, "null stackmap table");
1990 
1991   // check code_attribute_length first
1992   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1993 
1994   if (!need_verify && !DumpSharedSpaces) {
1995     return NULL;
1996   }
1997   return stackmap_table_start;
1998 }
1999 
2000 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2001                                                                             u2* const checked_exceptions_length,
2002                                                                             u4 method_attribute_length,
2003                                                                             TRAPS) {
2004   assert(cfs != NULL, "invariant");
2005   assert(checked_exceptions_length != NULL, "invariant");
2006 
2007   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
2008   *checked_exceptions_length = cfs->get_u2_fast();
2009   const unsigned int size =
2010     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2011   const unsafe_u2* const checked_exceptions_start = cfs->current();
2012   assert(checked_exceptions_start != NULL, "null checked exceptions");
2013   if (!_need_verify) {
2014     cfs->skip_u2_fast(size);
2015   } else {
2016     // Verify each value in the checked exception table
2017     u2 checked_exception;
2018     const u2 len = *checked_exceptions_length;
2019     cfs->guarantee_more(2 * len, CHECK_NULL);
2020     for (int i = 0; i < len; i++) {
2021       checked_exception = cfs->get_u2_fast();
2022       check_property(
2023         valid_klass_reference_at(checked_exception),
2024         "Exception name has bad type at constant pool %u in class file %s",
2025         checked_exception, CHECK_NULL);
2026     }
2027   }
2028   // check exceptions attribute length
2029   if (_need_verify) {
2030     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2031                                                    sizeof(u2) * size),
2032                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2033   }
2034   return checked_exceptions_start;
2035 }
2036 
2037 void ClassFileParser::throwIllegalSignature(const char* type,
2038                                             const Symbol* name,
2039                                             const Symbol* sig,
2040                                             TRAPS) const {
2041   assert(name != NULL, "invariant");
2042   assert(sig != NULL, "invariant");
2043 
2044   const char* class_note = "";
2045   if (is_inline_type() && name == vmSymbols::object_initializer_name()) {
2046     class_note = " (an inline class)";
2047   }
2048 
2049   ResourceMark rm(THREAD);
2050   Exceptions::fthrow(THREAD_AND_LOCATION,
2051       vmSymbols::java_lang_ClassFormatError(),
2052       "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2053       name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2054 }
2055 
2056 AnnotationCollector::ID
2057 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2058                                       const Symbol* name,
2059                                       const bool can_access_vm_annotations) {
2060   const vmSymbolID sid = vmSymbols::find_sid(name);
2061   // Privileged code can use all annotations.  Other code silently drops some.
2062   const bool privileged = loader_data->is_boot_class_loader_data() ||
2063                           loader_data->is_platform_class_loader_data() ||
2064                           can_access_vm_annotations;
2065   switch (sid) {
2066     case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2067       if (_location != _in_method)  break;  // only allow for methods
2068       if (!privileged)              break;  // only allow in privileged code
2069       return _method_CallerSensitive;
2070     }
2071     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2072       if (_location != _in_method)  break;  // only allow for methods
2073       if (!privileged)              break;  // only allow in privileged code
2074       return _method_ForceInline;
2075     }
2076     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2077       if (_location != _in_method)  break;  // only allow for methods
2078       if (!privileged)              break;  // only allow in privileged code
2079       return _method_DontInline;
2080     }
2081     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
2082       if (_location != _in_method)  break;  // only allow for methods
2083       if (!privileged)              break;  // only allow in privileged code
2084       return _method_ChangesCurrentThread;
2085     }
2086     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
2087       if (_location != _in_method)  break;  // only allow for methods
2088       if (!privileged)              break;  // only allow in privileged code
2089       return _method_JvmtiMountTransition;
2090     }
2091     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2092       if (_location != _in_method)  break;  // only allow for methods
2093       if (!privileged)              break;  // only allow in privileged code
2094       return _method_InjectedProfile;
2095     }
2096     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2097       if (_location != _in_method)  break;  // only allow for methods
2098       if (!privileged)              break;  // only allow in privileged code
2099       return _method_LambdaForm_Compiled;
2100     }
2101     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2102       if (_location != _in_method)  break;  // only allow for methods
2103       if (!privileged)              break;  // only allow in privileged code
2104       return _method_Hidden;
2105     }
2106     case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
2107       if (_location != _in_method)  break;  // only allow for methods
2108       if (!privileged)              break;  // only allow in privileged code
2109       return _method_Scoped;
2110     }
2111     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
2112       if (_location != _in_method)  break;  // only allow for methods
2113       if (!privileged)              break;  // only allow in privileged code
2114       return _method_IntrinsicCandidate;
2115     }
2116     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2117       if (_location != _in_field)   break;  // only allow for fields
2118       if (!privileged)              break;  // only allow in privileged code
2119       return _field_Stable;
2120     }
2121     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2122       if (_location != _in_field && _location != _in_class) {
2123         break;  // only allow for fields and classes
2124       }
2125       if (!EnableContended || (RestrictContended && !privileged)) {
2126         break;  // honor privileges
2127       }
2128       return _jdk_internal_vm_annotation_Contended;
2129     }
2130     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2131       if (_location != _in_method)  break;  // only allow for methods
2132       if (RestrictReservedStack && !privileged) break; // honor privileges
2133       return _jdk_internal_vm_annotation_ReservedStackAccess;
2134     }
2135     case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
2136       if (_location != _in_class)   break;  // only allow for classes
2137       if (!privileged)              break;  // only allow in privileged code
2138       return _jdk_internal_ValueBased;
2139     }
2140     default: {
2141       break;
2142     }
2143   }
2144   return AnnotationCollector::_unknown;
2145 }
2146 
2147 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2148   if (is_contended())
2149     f->set_contended_group(contended_group());
2150   if (is_stable())
2151     f->set_stable(true);
2152 }
2153 
2154 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2155   // If there's an error deallocate metadata for field annotations
2156   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2157   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2158 }
2159 
2160 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2161   if (has_annotation(_method_CallerSensitive))
2162     m->set_caller_sensitive(true);
2163   if (has_annotation(_method_ForceInline))
2164     m->set_force_inline(true);
2165   if (has_annotation(_method_DontInline))
2166     m->set_dont_inline(true);
2167   if (has_annotation(_method_ChangesCurrentThread))
2168     m->set_changes_current_thread(true);
2169   if (has_annotation(_method_JvmtiMountTransition))
2170     m->set_jvmti_mount_transition(true);
2171   if (has_annotation(_method_InjectedProfile))
2172     m->set_has_injected_profile(true);
2173   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2174     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2175   if (has_annotation(_method_Hidden))
2176     m->set_hidden(true);
2177   if (has_annotation(_method_Scoped))
2178     m->set_scoped(true);
2179   if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2180     m->set_intrinsic_candidate(true);
2181   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2182     m->set_has_reserved_stack_access(true);
2183 }
2184 
2185 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2186   assert(ik != NULL, "invariant");
2187   if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2188     ik->set_is_contended(is_contended());
2189   }
2190   if (has_annotation(_jdk_internal_ValueBased)) {
2191     ik->set_has_value_based_class_annotation();
2192     if (DiagnoseSyncOnValueBasedClasses) {
2193       ik->set_is_value_based();
2194     }
2195   }
2196 }
2197 
2198 #define MAX_ARGS_SIZE 255
2199 #define MAX_CODE_SIZE 65535
2200 #define INITIAL_MAX_LVT_NUMBER 256
2201 
2202 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2203  *
2204  * Rules for LVT's and LVTT's are:
2205  *   - There can be any number of LVT's and LVTT's.
2206  *   - If there are n LVT's, it is the same as if there was just
2207  *     one LVT containing all the entries from the n LVT's.
2208  *   - There may be no more than one LVT entry per local variable.
2209  *     Two LVT entries are 'equal' if these fields are the same:
2210  *        start_pc, length, name, slot
2211  *   - There may be no more than one LVTT entry per each LVT entry.
2212  *     Each LVTT entry has to match some LVT entry.
2213  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2214  */
2215 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2216                                                int lvt_cnt,
2217                                                u2* const localvariable_table_length,
2218                                                const unsafe_u2** const localvariable_table_start,
2219                                                int lvtt_cnt,
2220                                                u2* const localvariable_type_table_length,
2221                                                const unsafe_u2** const localvariable_type_table_start,
2222                                                TRAPS) {
2223 
2224   ResourceMark rm(THREAD);
2225 
2226   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2227                             256, AnyObj::RESOURCE_AREA, mtInternal,
2228                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2229 
2230   LVT_HashTable* const table = new LVT_HashTable();
2231 
2232   // To fill LocalVariableTable in
2233   const Classfile_LVT_Element* cf_lvt;
2234   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2235 
2236   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2237     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2238     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2239       copy_lvt_element(&cf_lvt[idx], lvt);
2240       // If no duplicates, add LVT elem in hashtable.
2241       if (table->put(*lvt, lvt) == false
2242           && _need_verify
2243           && _major_version >= JAVA_1_5_VERSION) {
2244         classfile_parse_error("Duplicated LocalVariableTable attribute "
2245                               "entry for '%s' in class file %s",
2246                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2247                                THREAD);
2248         return;
2249       }
2250     }
2251   }
2252 
2253   // To merge LocalVariableTable and LocalVariableTypeTable
2254   const Classfile_LVT_Element* cf_lvtt;
2255   LocalVariableTableElement lvtt_elem;
2256 
2257   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2258     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2259     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2260       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2261       LocalVariableTableElement** entry = table->get(lvtt_elem);
2262       if (entry == NULL) {
2263         if (_need_verify) {
2264           classfile_parse_error("LVTT entry for '%s' in class file %s "
2265                                 "does not match any LVT entry",
2266                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2267                                  THREAD);
2268           return;
2269         }
2270       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2271         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2272                               "entry for '%s' in class file %s",
2273                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2274                                THREAD);
2275         return;
2276       } else {
2277         // to add generic signatures into LocalVariableTable
2278         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2279       }
2280     }
2281   }
2282 }
2283 
2284 
2285 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2286                                        const u1* runtime_visible_annotations,
2287                                        int runtime_visible_annotations_length,
2288                                        const u1* runtime_invisible_annotations,
2289                                        int runtime_invisible_annotations_length,
2290                                        const u1* runtime_visible_parameter_annotations,
2291                                        int runtime_visible_parameter_annotations_length,
2292                                        const u1* runtime_invisible_parameter_annotations,
2293                                        int runtime_invisible_parameter_annotations_length,
2294                                        const u1* runtime_visible_type_annotations,
2295                                        int runtime_visible_type_annotations_length,
2296                                        const u1* runtime_invisible_type_annotations,
2297                                        int runtime_invisible_type_annotations_length,
2298                                        const u1* annotation_default,
2299                                        int annotation_default_length,
2300                                        TRAPS) {
2301 
2302   AnnotationArray* a;
2303 
2304   if (runtime_visible_annotations_length +
2305       runtime_invisible_annotations_length > 0) {
2306      a = assemble_annotations(runtime_visible_annotations,
2307                               runtime_visible_annotations_length,
2308                               runtime_invisible_annotations,
2309                               runtime_invisible_annotations_length,
2310                               CHECK);
2311      cm->set_method_annotations(a);
2312   }
2313 
2314   if (runtime_visible_parameter_annotations_length +
2315       runtime_invisible_parameter_annotations_length > 0) {
2316     a = assemble_annotations(runtime_visible_parameter_annotations,
2317                              runtime_visible_parameter_annotations_length,
2318                              runtime_invisible_parameter_annotations,
2319                              runtime_invisible_parameter_annotations_length,
2320                              CHECK);
2321     cm->set_parameter_annotations(a);
2322   }
2323 
2324   if (annotation_default_length > 0) {
2325     a = assemble_annotations(annotation_default,
2326                              annotation_default_length,
2327                              NULL,
2328                              0,
2329                              CHECK);
2330     cm->set_default_annotations(a);
2331   }
2332 
2333   if (runtime_visible_type_annotations_length +
2334       runtime_invisible_type_annotations_length > 0) {
2335     a = assemble_annotations(runtime_visible_type_annotations,
2336                              runtime_visible_type_annotations_length,
2337                              runtime_invisible_type_annotations,
2338                              runtime_invisible_type_annotations_length,
2339                              CHECK);
2340     cm->set_type_annotations(a);
2341   }
2342 }
2343 
2344 
2345 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2346 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2347 // Method* to save footprint, so we only know the size of the resulting Method* when the
2348 // entire method attribute is parsed.
2349 //
2350 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2351 
2352 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2353                                       bool is_interface,
2354                                       bool is_value_class,
2355                                       bool is_abstract_class,
2356                                       const ConstantPool* cp,
2357                                       bool* const has_localvariable_table,
2358                                       TRAPS) {
2359   assert(cfs != NULL, "invariant");
2360   assert(cp != NULL, "invariant");
2361   assert(has_localvariable_table != NULL, "invariant");
2362 
2363   ResourceMark rm(THREAD);
2364   // Parse fixed parts:
2365   // access_flags, name_index, descriptor_index, attributes_count
2366   cfs->guarantee_more(8, CHECK_NULL);
2367 
2368   int flags = cfs->get_u2_fast();
2369   const u2 name_index = cfs->get_u2_fast();
2370   const int cp_size = cp->length();
2371   check_property(
2372     valid_symbol_at(name_index),
2373     "Illegal constant pool index %u for method name in class file %s",
2374     name_index, CHECK_NULL);
2375   const Symbol* const name = cp->symbol_at(name_index);
2376   verify_legal_method_name(name, CHECK_NULL);
2377 
2378   const u2 signature_index = cfs->get_u2_fast();
2379   guarantee_property(
2380     valid_symbol_at(signature_index),
2381     "Illegal constant pool index %u for method signature in class file %s",
2382     signature_index, CHECK_NULL);
2383   const Symbol* const signature = cp->symbol_at(signature_index);
2384 
2385   if (name == vmSymbols::class_initializer_name()) {
2386     // We ignore the other access flags for a valid class initializer.
2387     // (JVM Spec 2nd ed., chapter 4.6)
2388     if (_major_version < 51) { // backward compatibility
2389       flags = JVM_ACC_STATIC;
2390     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2391       flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2392     } else {
2393       classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2394       return NULL;
2395     }
2396   } else {
2397     verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2398   }
2399 
2400   if (EnableValhalla && supports_inline_types() && name == vmSymbols::inline_factory_name()) {
2401     if (is_interface) {
2402       classfile_parse_error("Interface cannot have a method named <vnew>, class file %s", CHECK_NULL);
2403     } else if (!is_value_class) {
2404        classfile_parse_error("Identity class cannot have a method <vnew>, class file %s", CHECK_NULL);
2405     } else if (signature->is_void_method_signature()) {
2406        classfile_parse_error("Factory method <vnew> must have a non-void return type, class file %s", CHECK_NULL);
2407     } else { // also OK, a static factory, as long as the return value is good
2408       bool ok = false;
2409       SignatureStream ss((Symbol*) signature, true);
2410       while (!ss.at_return_type())  ss.next();
2411       if (ss.is_reference()) {
2412         Symbol* ret = ss.as_symbol();
2413         const Symbol* required = class_name();
2414         if (is_hidden()) {
2415           // The original class name for hidden classes changed.
2416           /// So using the original name in the return type is no longer valid.
2417           required = vmSymbols::java_lang_Object();
2418         }
2419         ok = (ret == required);
2420       }
2421       if (!ok) {
2422         throwIllegalSignature("Method", name, signature, CHECK_0);
2423       }
2424       // factory method, with a non-void return.  No other
2425       // definition of <vnew> is possible.
2426       //
2427       // The verifier (in verify_invoke_instructions) will inspect the
2428       // signature of any attempt to invoke <vnew>, and ensure that it
2429       // returns non-void.
2430     }
2431   }
2432 
2433   if (name == vmSymbols::object_initializer_name()) {
2434     if (is_interface) {
2435       classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2436     } else if ((!is_value_class || is_abstract_class) && signature->is_void_method_signature()) {
2437       // OK, a constructor
2438     } else {
2439       // not OK, so throw the same error as in verify_legal_method_signature.
2440       throwIllegalSignature("Method", name, signature, CHECK_0);
2441     }
2442     // A declared <init> method must always be a non-static
2443     // object constructor, with a void return.
2444     //
2445     // The verifier (in verify_invoke_instructions) will inspect the
2446     // signature of any attempt to invoke <init>, and ensure that it
2447     // returns void.
2448   }
2449 
2450   if (EnableValhalla) {
2451     if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2452         && ((flags & JVM_ACC_STATIC) == 0 )
2453         && !carries_identity_modifier()) {
2454       classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2455         return NULL;
2456     }
2457   }
2458 
2459   int args_size = -1;  // only used when _need_verify is true
2460   if (_need_verify) {
2461     verify_legal_name_with_signature(name, signature, CHECK_NULL);
2462     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2463                  verify_legal_method_signature(name, signature, CHECK_NULL);
2464     if (args_size > MAX_ARGS_SIZE) {
2465       classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2466       return NULL;
2467     }
2468   }
2469 
2470   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2471 
2472   // Default values for code and exceptions attribute elements
2473   u2 max_stack = 0;
2474   u2 max_locals = 0;
2475   u4 code_length = 0;
2476   const u1* code_start = 0;
2477   u2 exception_table_length = 0;
2478   const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2479   Array<int>* exception_handlers = Universe::the_empty_int_array();
2480   u2 checked_exceptions_length = 0;
2481   const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2482   CompressedLineNumberWriteStream* linenumber_table = NULL;
2483   int linenumber_table_length = 0;
2484   int total_lvt_length = 0;
2485   u2 lvt_cnt = 0;
2486   u2 lvtt_cnt = 0;
2487   bool lvt_allocated = false;
2488   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2489   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2490   u2* localvariable_table_length = NULL;
2491   const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2492   u2* localvariable_type_table_length = NULL;
2493   const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2494   int method_parameters_length = -1;
2495   const u1* method_parameters_data = NULL;
2496   bool method_parameters_seen = false;
2497   bool parsed_code_attribute = false;
2498   bool parsed_checked_exceptions_attribute = false;
2499   bool parsed_stackmap_attribute = false;
2500   // stackmap attribute - JDK1.5
2501   const u1* stackmap_data = NULL;
2502   int stackmap_data_length = 0;
2503   u2 generic_signature_index = 0;
2504   MethodAnnotationCollector parsed_annotations;
2505   const u1* runtime_visible_annotations = NULL;
2506   int runtime_visible_annotations_length = 0;
2507   const u1* runtime_invisible_annotations = NULL;
2508   int runtime_invisible_annotations_length = 0;
2509   const u1* runtime_visible_parameter_annotations = NULL;
2510   int runtime_visible_parameter_annotations_length = 0;
2511   const u1* runtime_invisible_parameter_annotations = NULL;
2512   int runtime_invisible_parameter_annotations_length = 0;
2513   const u1* runtime_visible_type_annotations = NULL;
2514   int runtime_visible_type_annotations_length = 0;
2515   const u1* runtime_invisible_type_annotations = NULL;
2516   int runtime_invisible_type_annotations_length = 0;
2517   bool runtime_invisible_annotations_exists = false;
2518   bool runtime_invisible_type_annotations_exists = false;
2519   bool runtime_invisible_parameter_annotations_exists = false;
2520   const u1* annotation_default = NULL;
2521   int annotation_default_length = 0;
2522 
2523   // Parse code and exceptions attribute
2524   u2 method_attributes_count = cfs->get_u2_fast();
2525   while (method_attributes_count--) {
2526     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2527     const u2 method_attribute_name_index = cfs->get_u2_fast();
2528     const u4 method_attribute_length = cfs->get_u4_fast();
2529     check_property(
2530       valid_symbol_at(method_attribute_name_index),
2531       "Invalid method attribute name index %u in class file %s",
2532       method_attribute_name_index, CHECK_NULL);
2533 
2534     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2535     if (method_attribute_name == vmSymbols::tag_code()) {
2536       // Parse Code attribute
2537       if (_need_verify) {
2538         guarantee_property(
2539             !access_flags.is_native() && !access_flags.is_abstract(),
2540                         "Code attribute in native or abstract methods in class file %s",
2541                          CHECK_NULL);
2542       }
2543       if (parsed_code_attribute) {
2544         classfile_parse_error("Multiple Code attributes in class file %s",
2545                               THREAD);
2546         return NULL;
2547       }
2548       parsed_code_attribute = true;
2549 
2550       // Stack size, locals size, and code size
2551       cfs->guarantee_more(8, CHECK_NULL);
2552       max_stack = cfs->get_u2_fast();
2553       max_locals = cfs->get_u2_fast();
2554       code_length = cfs->get_u4_fast();
2555       if (_need_verify) {
2556         guarantee_property(args_size <= max_locals,
2557                            "Arguments can't fit into locals in class file %s",
2558                            CHECK_NULL);
2559         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2560                            "Invalid method Code length %u in class file %s",
2561                            code_length, CHECK_NULL);
2562       }
2563       // Code pointer
2564       code_start = cfs->current();
2565       assert(code_start != NULL, "null code start");
2566       cfs->guarantee_more(code_length, CHECK_NULL);
2567       cfs->skip_u1_fast(code_length);
2568 
2569       // Exception handler table
2570       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2571       exception_table_length = cfs->get_u2_fast();
2572       if (exception_table_length > 0) {
2573         exception_table_start = parse_exception_table(cfs,
2574                                                       code_length,
2575                                                       exception_table_length,
2576                                                       CHECK_NULL);
2577       }
2578 
2579       // Parse additional attributes in code attribute
2580       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2581       u2 code_attributes_count = cfs->get_u2_fast();
2582 
2583       unsigned int calculated_attribute_length = 0;
2584 
2585       calculated_attribute_length =
2586           sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2587       calculated_attribute_length +=
2588         code_length +
2589         sizeof(exception_table_length) +
2590         sizeof(code_attributes_count) +
2591         exception_table_length *
2592             ( sizeof(u2) +   // start_pc
2593               sizeof(u2) +   // end_pc
2594               sizeof(u2) +   // handler_pc
2595               sizeof(u2) );  // catch_type_index
2596 
2597       while (code_attributes_count--) {
2598         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2599         const u2 code_attribute_name_index = cfs->get_u2_fast();
2600         const u4 code_attribute_length = cfs->get_u4_fast();
2601         calculated_attribute_length += code_attribute_length +
2602                                        sizeof(code_attribute_name_index) +
2603                                        sizeof(code_attribute_length);
2604         check_property(valid_symbol_at(code_attribute_name_index),
2605                        "Invalid code attribute name index %u in class file %s",
2606                        code_attribute_name_index,
2607                        CHECK_NULL);
2608         if (LoadLineNumberTables &&
2609             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2610           // Parse and compress line number table
2611           parse_linenumber_table(code_attribute_length,
2612                                  code_length,
2613                                  &linenumber_table,
2614                                  CHECK_NULL);
2615 
2616         } else if (LoadLocalVariableTables &&
2617                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2618           // Parse local variable table
2619           if (!lvt_allocated) {
2620             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2621               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2622             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2623               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2624             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2625               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2626             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2627               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2628             lvt_allocated = true;
2629           }
2630           if (lvt_cnt == max_lvt_cnt) {
2631             max_lvt_cnt <<= 1;
2632             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2633             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2634           }
2635           localvariable_table_start[lvt_cnt] =
2636             parse_localvariable_table(cfs,
2637                                       code_length,
2638                                       max_locals,
2639                                       code_attribute_length,
2640                                       &localvariable_table_length[lvt_cnt],
2641                                       false,    // is not LVTT
2642                                       CHECK_NULL);
2643           total_lvt_length += localvariable_table_length[lvt_cnt];
2644           lvt_cnt++;
2645         } else if (LoadLocalVariableTypeTables &&
2646                    _major_version >= JAVA_1_5_VERSION &&
2647                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2648           if (!lvt_allocated) {
2649             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2650               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2651             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2652               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2653             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2654               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2655             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2656               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2657             lvt_allocated = true;
2658           }
2659           // Parse local variable type table
2660           if (lvtt_cnt == max_lvtt_cnt) {
2661             max_lvtt_cnt <<= 1;
2662             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2663             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2664           }
2665           localvariable_type_table_start[lvtt_cnt] =
2666             parse_localvariable_table(cfs,
2667                                       code_length,
2668                                       max_locals,
2669                                       code_attribute_length,
2670                                       &localvariable_type_table_length[lvtt_cnt],
2671                                       true,     // is LVTT
2672                                       CHECK_NULL);
2673           lvtt_cnt++;
2674         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2675                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2676           // Stack map is only needed by the new verifier in JDK1.5.
2677           if (parsed_stackmap_attribute) {
2678             classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2679             return NULL;
2680           }
2681           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2682           stackmap_data_length = code_attribute_length;
2683           parsed_stackmap_attribute = true;
2684         } else {
2685           // Skip unknown attributes
2686           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2687         }
2688       }
2689       // check method attribute length
2690       if (_need_verify) {
2691         guarantee_property(method_attribute_length == calculated_attribute_length,
2692                            "Code segment has wrong length in class file %s",
2693                            CHECK_NULL);
2694       }
2695     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2696       // Parse Exceptions attribute
2697       if (parsed_checked_exceptions_attribute) {
2698         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2699                               THREAD);
2700         return NULL;
2701       }
2702       parsed_checked_exceptions_attribute = true;
2703       checked_exceptions_start =
2704             parse_checked_exceptions(cfs,
2705                                      &checked_exceptions_length,
2706                                      method_attribute_length,
2707                                      CHECK_NULL);
2708     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2709       // reject multiple method parameters
2710       if (method_parameters_seen) {
2711         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2712                               THREAD);
2713         return NULL;
2714       }
2715       method_parameters_seen = true;
2716       method_parameters_length = cfs->get_u1_fast();
2717       const u2 real_length = (method_parameters_length * 4u) + 1u;
2718       if (method_attribute_length != real_length) {
2719         classfile_parse_error(
2720           "Invalid MethodParameters method attribute length %u in class file",
2721           method_attribute_length, THREAD);
2722         return NULL;
2723       }
2724       method_parameters_data = cfs->current();
2725       cfs->skip_u2_fast(method_parameters_length);
2726       cfs->skip_u2_fast(method_parameters_length);
2727       // ignore this attribute if it cannot be reflected
2728       if (!vmClasses::Parameter_klass_loaded())
2729         method_parameters_length = -1;
2730     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2731       if (method_attribute_length != 0) {
2732         classfile_parse_error(
2733           "Invalid Synthetic method attribute length %u in class file %s",
2734           method_attribute_length, THREAD);
2735         return NULL;
2736       }
2737       // Should we check that there hasn't already been a synthetic attribute?
2738       access_flags.set_is_synthetic();
2739     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2740       if (method_attribute_length != 0) {
2741         classfile_parse_error(
2742           "Invalid Deprecated method attribute length %u in class file %s",
2743           method_attribute_length, THREAD);
2744         return NULL;
2745       }
2746     } else if (_major_version >= JAVA_1_5_VERSION) {
2747       if (method_attribute_name == vmSymbols::tag_signature()) {
2748         if (generic_signature_index != 0) {
2749           classfile_parse_error(
2750             "Multiple Signature attributes for method in class file %s",
2751             THREAD);
2752           return NULL;
2753         }
2754         if (method_attribute_length != 2) {
2755           classfile_parse_error(
2756             "Invalid Signature attribute length %u in class file %s",
2757             method_attribute_length, THREAD);
2758           return NULL;
2759         }
2760         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2761       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2762         if (runtime_visible_annotations != NULL) {
2763           classfile_parse_error(
2764             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2765             THREAD);
2766           return NULL;
2767         }
2768         runtime_visible_annotations_length = method_attribute_length;
2769         runtime_visible_annotations = cfs->current();
2770         assert(runtime_visible_annotations != NULL, "null visible annotations");
2771         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2772         parse_annotations(cp,
2773                           runtime_visible_annotations,
2774                           runtime_visible_annotations_length,
2775                           &parsed_annotations,
2776                           _loader_data,
2777                           _can_access_vm_annotations);
2778         cfs->skip_u1_fast(runtime_visible_annotations_length);
2779       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2780         if (runtime_invisible_annotations_exists) {
2781           classfile_parse_error(
2782             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2783             THREAD);
2784           return NULL;
2785         }
2786         runtime_invisible_annotations_exists = true;
2787         if (PreserveAllAnnotations) {
2788           runtime_invisible_annotations_length = method_attribute_length;
2789           runtime_invisible_annotations = cfs->current();
2790           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2791         }
2792         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2793       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2794         if (runtime_visible_parameter_annotations != NULL) {
2795           classfile_parse_error(
2796             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2797             THREAD);
2798           return NULL;
2799         }
2800         runtime_visible_parameter_annotations_length = method_attribute_length;
2801         runtime_visible_parameter_annotations = cfs->current();
2802         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2803         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2804       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2805         if (runtime_invisible_parameter_annotations_exists) {
2806           classfile_parse_error(
2807             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2808             THREAD);
2809           return NULL;
2810         }
2811         runtime_invisible_parameter_annotations_exists = true;
2812         if (PreserveAllAnnotations) {
2813           runtime_invisible_parameter_annotations_length = method_attribute_length;
2814           runtime_invisible_parameter_annotations = cfs->current();
2815           assert(runtime_invisible_parameter_annotations != NULL,
2816             "null invisible parameter annotations");
2817         }
2818         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2819       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2820         if (annotation_default != NULL) {
2821           classfile_parse_error(
2822             "Multiple AnnotationDefault attributes for method in class file %s",
2823             THREAD);
2824           return NULL;
2825         }
2826         annotation_default_length = method_attribute_length;
2827         annotation_default = cfs->current();
2828         assert(annotation_default != NULL, "null annotation default");
2829         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2830       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2831         if (runtime_visible_type_annotations != NULL) {
2832           classfile_parse_error(
2833             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2834             THREAD);
2835           return NULL;
2836         }
2837         runtime_visible_type_annotations_length = method_attribute_length;
2838         runtime_visible_type_annotations = cfs->current();
2839         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2840         // No need for the VM to parse Type annotations
2841         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2842       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2843         if (runtime_invisible_type_annotations_exists) {
2844           classfile_parse_error(
2845             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2846             THREAD);
2847           return NULL;
2848         } else {
2849           runtime_invisible_type_annotations_exists = true;
2850         }
2851         if (PreserveAllAnnotations) {
2852           runtime_invisible_type_annotations_length = method_attribute_length;
2853           runtime_invisible_type_annotations = cfs->current();
2854           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2855         }
2856         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2857       } else {
2858         // Skip unknown attributes
2859         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2860       }
2861     } else {
2862       // Skip unknown attributes
2863       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2864     }
2865   }
2866 
2867   if (linenumber_table != NULL) {
2868     linenumber_table->write_terminator();
2869     linenumber_table_length = linenumber_table->position();
2870   }
2871 
2872   // Make sure there's at least one Code attribute in non-native/non-abstract method
2873   if (_need_verify) {
2874     guarantee_property(access_flags.is_native() ||
2875                        access_flags.is_abstract() ||
2876                        parsed_code_attribute,
2877                        "Absent Code attribute in method that is not native or abstract in class file %s",
2878                        CHECK_NULL);
2879   }
2880 
2881   // All sizing information for a Method* is finally available, now create it
2882   InlineTableSizes sizes(
2883       total_lvt_length,
2884       linenumber_table_length,
2885       exception_table_length,
2886       checked_exceptions_length,
2887       method_parameters_length,
2888       generic_signature_index,
2889       runtime_visible_annotations_length +
2890            runtime_invisible_annotations_length,
2891       runtime_visible_parameter_annotations_length +
2892            runtime_invisible_parameter_annotations_length,
2893       runtime_visible_type_annotations_length +
2894            runtime_invisible_type_annotations_length,
2895       annotation_default_length,
2896       0);
2897 
2898   Method* const m = Method::allocate(_loader_data,
2899                                      code_length,
2900                                      access_flags,
2901                                      &sizes,
2902                                      ConstMethod::NORMAL,
2903                                      _cp->symbol_at(name_index),
2904                                      CHECK_NULL);
2905 
2906   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2907 
2908   // Fill in information from fixed part (access_flags already set)
2909   m->set_constants(_cp);
2910   m->set_name_index(name_index);
2911   m->set_signature_index(signature_index);
2912   m->compute_from_signature(cp->symbol_at(signature_index));
2913   assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2914 
2915   // Fill in code attribute information
2916   m->set_max_stack(max_stack);
2917   m->set_max_locals(max_locals);
2918   if (stackmap_data != NULL) {
2919     m->constMethod()->copy_stackmap_data(_loader_data,
2920                                          (u1*)stackmap_data,
2921                                          stackmap_data_length,
2922                                          CHECK_NULL);
2923   }
2924 
2925   // Copy byte codes
2926   m->set_code((u1*)code_start);
2927 
2928   // Copy line number table
2929   if (linenumber_table != NULL) {
2930     memcpy(m->compressed_linenumber_table(),
2931            linenumber_table->buffer(),
2932            linenumber_table_length);
2933   }
2934 
2935   // Copy exception table
2936   if (exception_table_length > 0) {
2937     Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2938                                                 m->exception_table_start(),
2939                                                 exception_table_length * sizeof(ExceptionTableElement),
2940                                                 sizeof(u2));
2941   }
2942 
2943   // Copy method parameters
2944   if (method_parameters_length > 0) {
2945     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2946     for (int i = 0; i < method_parameters_length; i++) {
2947       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2948       method_parameters_data += 2;
2949       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2950       method_parameters_data += 2;
2951     }
2952   }
2953 
2954   // Copy checked exceptions
2955   if (checked_exceptions_length > 0) {
2956     Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2957                                                 m->checked_exceptions_start(),
2958                                                 checked_exceptions_length * sizeof(CheckedExceptionElement),
2959                                                 sizeof(u2));
2960   }
2961 
2962   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2963   if (total_lvt_length > 0) {
2964     *has_localvariable_table = true;
2965     copy_localvariable_table(m->constMethod(),
2966                              lvt_cnt,
2967                              localvariable_table_length,
2968                              localvariable_table_start,
2969                              lvtt_cnt,
2970                              localvariable_type_table_length,
2971                              localvariable_type_table_start,
2972                              CHECK_NULL);
2973   }
2974 
2975   if (parsed_annotations.has_any_annotations())
2976     parsed_annotations.apply_to(methodHandle(THREAD, m));
2977 
2978   if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2979     m->set_hidden(true);
2980   }
2981 
2982   // Copy annotations
2983   copy_method_annotations(m->constMethod(),
2984                           runtime_visible_annotations,
2985                           runtime_visible_annotations_length,
2986                           runtime_invisible_annotations,
2987                           runtime_invisible_annotations_length,
2988                           runtime_visible_parameter_annotations,
2989                           runtime_visible_parameter_annotations_length,
2990                           runtime_invisible_parameter_annotations,
2991                           runtime_invisible_parameter_annotations_length,
2992                           runtime_visible_type_annotations,
2993                           runtime_visible_type_annotations_length,
2994                           runtime_invisible_type_annotations,
2995                           runtime_invisible_type_annotations_length,
2996                           annotation_default,
2997                           annotation_default_length,
2998                           CHECK_NULL);
2999 
3000   if (InstanceKlass::is_finalization_enabled() &&
3001       name == vmSymbols::finalize_method_name() &&
3002       signature == vmSymbols::void_method_signature()) {
3003     if (m->is_empty_method()) {
3004       _has_empty_finalizer = true;
3005     } else {
3006       _has_finalizer = true;
3007     }
3008   }
3009   if (name == vmSymbols::object_initializer_name() &&
3010       signature == vmSymbols::void_method_signature() &&
3011       m->is_vanilla_constructor()) {
3012     _has_vanilla_constructor = true;
3013   }
3014 
3015   NOT_PRODUCT(m->verify());
3016   return m;
3017 }
3018 
3019 
3020 // Side-effects: populates the _methods field in the parser
3021 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3022                                     bool is_interface,
3023                                     bool is_value_class,
3024                                     bool is_abstract_type,
3025                                     bool* const has_localvariable_table,
3026                                     bool* has_final_method,
3027                                     bool* declares_nonstatic_concrete_methods,
3028                                     TRAPS) {
3029   assert(cfs != NULL, "invariant");
3030   assert(has_localvariable_table != NULL, "invariant");
3031   assert(has_final_method != NULL, "invariant");
3032   assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3033 
3034   assert(NULL == _methods, "invariant");
3035 
3036   cfs->guarantee_more(2, CHECK);  // length
3037   const u2 length = cfs->get_u2_fast();
3038   if (length == 0) {
3039     _methods = Universe::the_empty_method_array();
3040   } else {
3041     _methods = MetadataFactory::new_array<Method*>(_loader_data,
3042                                                    length,
3043                                                    NULL,
3044                                                    CHECK);
3045 
3046     for (int index = 0; index < length; index++) {
3047       Method* method = parse_method(cfs,
3048                                     is_interface,
3049                                     is_value_class,
3050                                     is_abstract_type,
3051                                     _cp,
3052                                     has_localvariable_table,
3053                                     CHECK);
3054 
3055       if (method->is_final()) {
3056         *has_final_method = true;
3057       }
3058       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3059       // used for interface initialization, and default method inheritance analysis
3060       if (is_interface && !(*declares_nonstatic_concrete_methods)
3061         && !method->is_abstract() && !method->is_static()) {
3062         *declares_nonstatic_concrete_methods = true;
3063       }
3064       _methods->at_put(index, method);
3065     }
3066 
3067     if (_need_verify && length > 1) {
3068       // Check duplicated methods
3069       ResourceMark rm(THREAD);
3070       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3071         THREAD, NameSigHash*, HASH_ROW_SIZE);
3072       initialize_hashtable(names_and_sigs);
3073       bool dup = false;
3074       const Symbol* name = NULL;
3075       const Symbol* sig = NULL;
3076       {
3077         debug_only(NoSafepointVerifier nsv;)
3078         for (int i = 0; i < length; i++) {
3079           const Method* const m = _methods->at(i);
3080           name = m->name();
3081           sig = m->signature();
3082           // If no duplicates, add name/signature in hashtable names_and_sigs.
3083           if (!put_after_lookup(name, sig, names_and_sigs)) {
3084             dup = true;
3085             break;
3086           }
3087         }
3088       }
3089       if (dup) {
3090         classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
3091                                name->as_C_string(), sig->as_klass_external_name(), THREAD);
3092       }
3093     }
3094   }
3095 }
3096 
3097 static const intArray* sort_methods(Array<Method*>* methods) {
3098   const int length = methods->length();
3099   // If JVMTI original method ordering or sharing is enabled we have to
3100   // remember the original class file ordering.
3101   // We temporarily use the vtable_index field in the Method* to store the
3102   // class file index, so we can read in after calling qsort.
3103   // Put the method ordering in the shared archive.
3104   if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3105     for (int index = 0; index < length; index++) {
3106       Method* const m = methods->at(index);
3107       assert(!m->valid_vtable_index(), "vtable index should not be set");
3108       m->set_vtable_index(index);
3109     }
3110   }
3111   // Sort method array by ascending method name (for faster lookups & vtable construction)
3112   // Note that the ordering is not alphabetical, see Symbol::fast_compare
3113   Method::sort_methods(methods);
3114 
3115   intArray* method_ordering = NULL;
3116   // If JVMTI original method ordering or sharing is enabled construct int
3117   // array remembering the original ordering
3118   if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
3119     method_ordering = new intArray(length, length, -1);
3120     for (int index = 0; index < length; index++) {
3121       Method* const m = methods->at(index);
3122       const int old_index = m->vtable_index();
3123       assert(old_index >= 0 && old_index < length, "invalid method index");
3124       method_ordering->at_put(index, old_index);
3125       m->set_vtable_index(Method::invalid_vtable_index);
3126     }
3127   }
3128   return method_ordering;
3129 }
3130 
3131 // Parse generic_signature attribute for methods and fields
3132 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3133                                                       TRAPS) {
3134   assert(cfs != NULL, "invariant");
3135 
3136   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
3137   const u2 generic_signature_index = cfs->get_u2_fast();
3138   check_property(
3139     valid_symbol_at(generic_signature_index),
3140     "Invalid Signature attribute at constant pool index %u in class file %s",
3141     generic_signature_index, CHECK_0);
3142   return generic_signature_index;
3143 }
3144 
3145 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3146                                                            TRAPS) {
3147 
3148   assert(cfs != NULL, "invariant");
3149 
3150   cfs->guarantee_more(2, CHECK);  // sourcefile_index
3151   const u2 sourcefile_index = cfs->get_u2_fast();
3152   check_property(
3153     valid_symbol_at(sourcefile_index),
3154     "Invalid SourceFile attribute at constant pool index %u in class file %s",
3155     sourcefile_index, CHECK);
3156   set_class_sourcefile_index(sourcefile_index);
3157 }
3158 
3159 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3160                                                                        int length,
3161                                                                        TRAPS) {
3162   assert(cfs != NULL, "invariant");
3163 
3164   const u1* const sde_buffer = cfs->current();
3165   assert(sde_buffer != NULL, "null sde buffer");
3166 
3167   // Don't bother storing it if there is no way to retrieve it
3168   if (JvmtiExport::can_get_source_debug_extension()) {
3169     assert((length+1) > length, "Overflow checking");
3170     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3171     for (int i = 0; i < length; i++) {
3172       sde[i] = sde_buffer[i];
3173     }
3174     sde[length] = '\0';
3175     set_class_sde_buffer((const char*)sde, length);
3176   }
3177   // Got utf8 string, set stream position forward
3178   cfs->skip_u1(length, CHECK);
3179 }
3180 
3181 
3182 // Inner classes can be static, private or protected (classic VM does this)
3183 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3184                                            JVM_ACC_PRIVATE |                \
3185                                            JVM_ACC_PROTECTED |              \
3186                                            JVM_ACC_STATIC                   \
3187                                          )
3188 
3189 // Find index of the InnerClasses entry for the specified inner_class_info_index.
3190 // Return -1 if none is found.
3191 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3192   Symbol* cp_klass_name =  cp->klass_name_at(inner);
3193   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3194     int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3195     if (cp->klass_name_at(idx_inner) == cp_klass_name) {
3196       return idx;
3197     }
3198   }
3199   return -1;
3200 }
3201 
3202 // Return the outer_class_info_index for the InnerClasses entry containing the
3203 // specified inner_class_info_index.  Return -1 if no InnerClasses entry is found.
3204 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
3205   if (inner == 0) return -1;
3206   int idx = inner_classes_find_index(inner_classes, inner, cp, length);
3207   if (idx == -1) return -1;
3208   int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3209   return result;
3210 }
3211 
3212 // Return true if circularity is found, false if no circularity is found.
3213 // Use Floyd's cycle finding algorithm.
3214 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
3215   int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
3216   int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
3217 
3218   while (fast != -1 && fast != 0) {
3219     if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
3220       return true;  // found a circularity
3221     }
3222     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3223     if (fast == -1) return false;
3224     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3225     if (fast == -1) return false;
3226     slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3227     assert(slow != -1, "sanity check");
3228   }
3229   return false;
3230 }
3231 
3232 // Loop through each InnerClasses entry checking for circularities and duplications
3233 // with other entries.  If duplicate entries are found then throw CFE.  Otherwise,
3234 // return true if a circularity or entries with duplicate inner_class_info_indexes
3235 // are found.
3236 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3237   // Loop through each InnerClasses entry.
3238   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3239     // Return true if there are circular entries.
3240     if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3241       return true;
3242     }
3243     // Check if there are duplicate entries or entries with the same inner_class_info_index.
3244     for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3245          y += InstanceKlass::inner_class_next_offset) {
3246 
3247       // 4347400: make sure there's no duplicate entry in the classes array
3248       if (_major_version >= JAVA_1_5_VERSION) {
3249         guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3250                             _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3251                             _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3252                             _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3253                            "Duplicate entry in InnerClasses attribute in class file %s",
3254                            CHECK_(true));
3255       }
3256       // Return true if there are two entries with the same inner_class_info_index.
3257       if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3258         return true;
3259       }
3260     }
3261   }
3262   return false;
3263 }
3264 
3265 // Return number of classes in the inner classes attribute table
3266 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3267                                                             const ConstantPool* cp,
3268                                                             const u1* const inner_classes_attribute_start,
3269                                                             bool parsed_enclosingmethod_attribute,
3270                                                             u2 enclosing_method_class_index,
3271                                                             u2 enclosing_method_method_index,
3272                                                             TRAPS) {
3273   const u1* const current_mark = cfs->current();
3274   u2 length = 0;
3275   if (inner_classes_attribute_start != NULL) {
3276     cfs->set_current(inner_classes_attribute_start);
3277     cfs->guarantee_more(2, CHECK_0);  // length
3278     length = cfs->get_u2_fast();
3279   }
3280 
3281   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3282   // method data:
3283   //   [inner_class_info_index,
3284   //    outer_class_info_index,
3285   //    inner_name_index,
3286   //    inner_class_access_flags,
3287   //    ...
3288   //    enclosing_method_class_index,
3289   //    enclosing_method_method_index]
3290   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3291   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3292   _inner_classes = inner_classes;
3293 
3294   int index = 0;
3295   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
3296   for (int n = 0; n < length; n++) {
3297     // Inner class index
3298     const u2 inner_class_info_index = cfs->get_u2_fast();
3299     check_property(
3300       valid_klass_reference_at(inner_class_info_index),
3301       "inner_class_info_index %u has bad constant type in class file %s",
3302       inner_class_info_index, CHECK_0);
3303     // Outer class index
3304     const u2 outer_class_info_index = cfs->get_u2_fast();
3305     check_property(
3306       outer_class_info_index == 0 ||
3307         valid_klass_reference_at(outer_class_info_index),
3308       "outer_class_info_index %u has bad constant type in class file %s",
3309       outer_class_info_index, CHECK_0);
3310 
3311     if (outer_class_info_index != 0) {
3312       const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3313       char* bytes = (char*)outer_class_name->bytes();
3314       guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3315                          "Outer class is an array class in class file %s", CHECK_0);
3316     }
3317     // Inner class name
3318     const u2 inner_name_index = cfs->get_u2_fast();
3319     check_property(
3320       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3321       "inner_name_index %u has bad constant type in class file %s",
3322       inner_name_index, CHECK_0);
3323     if (_need_verify) {
3324       guarantee_property(inner_class_info_index != outer_class_info_index,
3325                          "Class is both outer and inner class in class file %s", CHECK_0);
3326     }
3327 
3328     jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3329     // JVM_ACC_MODULE is defined in JDK-9 and later.
3330     if (_major_version >= JAVA_9_VERSION) {
3331       recognized_modifiers |= JVM_ACC_MODULE;
3332     }
3333     if (supports_inline_types()) {
3334       recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE | JVM_ACC_IDENTITY;
3335     }
3336 
3337     // Access flags
3338     jint flags = cfs->get_u2_fast() & recognized_modifiers;
3339 
3340     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3341       // Set abstract bit for old class files for backward compatibility
3342       flags |= JVM_ACC_ABSTRACT;
3343     }
3344 
3345     if (EnableValhalla) {
3346       if (!supports_inline_types()) {
3347         const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3348         const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3349         if (!is_module && !is_interface) {
3350           flags |= JVM_ACC_IDENTITY;
3351         }
3352       }
3353     }
3354 
3355     const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3356     verify_legal_class_modifiers(flags, name, false, CHECK_0);
3357     AccessFlags inner_access_flags(flags);
3358 
3359     inner_classes->at_put(index++, inner_class_info_index);
3360     inner_classes->at_put(index++, outer_class_info_index);
3361     inner_classes->at_put(index++, inner_name_index);
3362     inner_classes->at_put(index++, inner_access_flags.as_short());
3363   }
3364 
3365   // Check for circular and duplicate entries.
3366   bool has_circularity = false;
3367   if (_need_verify) {
3368     has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3369     if (has_circularity) {
3370       // If circularity check failed then ignore InnerClasses attribute.
3371       MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3372       index = 0;
3373       if (parsed_enclosingmethod_attribute) {
3374         inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3375         _inner_classes = inner_classes;
3376       } else {
3377         _inner_classes = Universe::the_empty_short_array();
3378       }
3379     }
3380   }
3381   // Set EnclosingMethod class and method indexes.
3382   if (parsed_enclosingmethod_attribute) {
3383     inner_classes->at_put(index++, enclosing_method_class_index);
3384     inner_classes->at_put(index++, enclosing_method_method_index);
3385   }
3386   assert(index == size || has_circularity, "wrong size");
3387 
3388   // Restore buffer's current position.
3389   cfs->set_current(current_mark);
3390 
3391   return length;
3392 }
3393 
3394 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3395                                                            const u1* const nest_members_attribute_start,
3396                                                            TRAPS) {
3397   const u1* const current_mark = cfs->current();
3398   u2 length = 0;
3399   if (nest_members_attribute_start != NULL) {
3400     cfs->set_current(nest_members_attribute_start);
3401     cfs->guarantee_more(2, CHECK_0);  // length
3402     length = cfs->get_u2_fast();
3403   }
3404   const int size = length;
3405   Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3406   _nest_members = nest_members;
3407 
3408   int index = 0;
3409   cfs->guarantee_more(2 * length, CHECK_0);
3410   for (int n = 0; n < length; n++) {
3411     const u2 class_info_index = cfs->get_u2_fast();
3412     check_property(
3413       valid_klass_reference_at(class_info_index),
3414       "Nest member class_info_index %u has bad constant type in class file %s",
3415       class_info_index, CHECK_0);
3416     nest_members->at_put(index++, class_info_index);
3417   }
3418   assert(index == size, "wrong size");
3419 
3420   // Restore buffer's current position.
3421   cfs->set_current(current_mark);
3422 
3423   return length;
3424 }
3425 
3426 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3427                                                                    const u1* const permitted_subclasses_attribute_start,
3428                                                                    TRAPS) {
3429   const u1* const current_mark = cfs->current();
3430   u2 length = 0;
3431   if (permitted_subclasses_attribute_start != NULL) {
3432     cfs->set_current(permitted_subclasses_attribute_start);
3433     cfs->guarantee_more(2, CHECK_0);  // length
3434     length = cfs->get_u2_fast();
3435   }
3436   const int size = length;
3437   Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3438   _permitted_subclasses = permitted_subclasses;
3439 
3440   if (length > 0) {
3441     int index = 0;
3442     cfs->guarantee_more(2 * length, CHECK_0);
3443     for (int n = 0; n < length; n++) {
3444       const u2 class_info_index = cfs->get_u2_fast();
3445       check_property(
3446         valid_klass_reference_at(class_info_index),
3447         "Permitted subclass class_info_index %u has bad constant type in class file %s",
3448         class_info_index, CHECK_0);
3449       permitted_subclasses->at_put(index++, class_info_index);
3450     }
3451     assert(index == size, "wrong size");
3452   }
3453 
3454   // Restore buffer's current position.
3455   cfs->set_current(current_mark);
3456 
3457   return length;
3458 }
3459 
3460 u2 ClassFileParser::parse_classfile_preload_attribute(const ClassFileStream* const cfs,
3461                                                                    const u1* const preload_attribute_start,
3462                                                                    TRAPS) {
3463   const u1* const current_mark = cfs->current();
3464   u2 length = 0;
3465   if (preload_attribute_start != NULL) {
3466     cfs->set_current(preload_attribute_start);
3467     cfs->guarantee_more(2, CHECK_0);  // length
3468     length = cfs->get_u2_fast();
3469   }
3470   const int size = length;
3471   Array<u2>* const preload_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3472   _preload_classes = preload_classes;
3473   if (length > 0) {
3474     int index = 0;
3475     cfs->guarantee_more(2 * length, CHECK_0);
3476     for (int n = 0; n < length; n++) {
3477       const u2 class_info_index = cfs->get_u2_fast();
3478       check_property(
3479         valid_klass_reference_at(class_info_index),
3480         "Preload class_info_index %u has bad constant type in class file %s",
3481         class_info_index, CHECK_0);
3482       preload_classes->at_put(index++, class_info_index);
3483     }
3484     assert(index == size, "wrong size");
3485   }
3486 
3487   // Restore buffer's current position.
3488   cfs->set_current(current_mark);
3489 
3490   return length;
3491 }
3492 
3493 //  Record {
3494 //    u2 attribute_name_index;
3495 //    u4 attribute_length;
3496 //    u2 components_count;
3497 //    component_info components[components_count];
3498 //  }
3499 //  component_info {
3500 //    u2 name_index;
3501 //    u2 descriptor_index
3502 //    u2 attributes_count;
3503 //    attribute_info_attributes[attributes_count];
3504 //  }
3505 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3506                                                      const ConstantPool* cp,
3507                                                      const u1* const record_attribute_start,
3508                                                      TRAPS) {
3509   const u1* const current_mark = cfs->current();
3510   int components_count = 0;
3511   unsigned int calculate_attr_size = 0;
3512   if (record_attribute_start != NULL) {
3513     cfs->set_current(record_attribute_start);
3514     cfs->guarantee_more(2, CHECK_0);  // num of components
3515     components_count = (int)cfs->get_u2_fast();
3516     calculate_attr_size = 2;
3517   }
3518 
3519   Array<RecordComponent*>* const record_components =
3520     MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0);
3521   _record_components = record_components;
3522 
3523   for (int x = 0; x < components_count; x++) {
3524     cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3525 
3526     const u2 name_index = cfs->get_u2_fast();
3527     check_property(valid_symbol_at(name_index),
3528       "Invalid constant pool index %u for name in Record attribute in class file %s",
3529       name_index, CHECK_0);
3530     const Symbol* const name = cp->symbol_at(name_index);
3531     verify_legal_field_name(name, CHECK_0);
3532 
3533     const u2 descriptor_index = cfs->get_u2_fast();
3534     check_property(valid_symbol_at(descriptor_index),
3535       "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3536       descriptor_index, CHECK_0);
3537     const Symbol* const descr = cp->symbol_at(descriptor_index);
3538     verify_legal_field_signature(name, descr, CHECK_0);
3539 
3540     const u2 attributes_count = cfs->get_u2_fast();
3541     calculate_attr_size += 6;
3542     u2 generic_sig_index = 0;
3543     const u1* runtime_visible_annotations = NULL;
3544     int runtime_visible_annotations_length = 0;
3545     const u1* runtime_invisible_annotations = NULL;
3546     int runtime_invisible_annotations_length = 0;
3547     bool runtime_invisible_annotations_exists = false;
3548     const u1* runtime_visible_type_annotations = NULL;
3549     int runtime_visible_type_annotations_length = 0;
3550     const u1* runtime_invisible_type_annotations = NULL;
3551     int runtime_invisible_type_annotations_length = 0;
3552     bool runtime_invisible_type_annotations_exists = false;
3553 
3554     // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3555     // and Runtime(In)VisibleTypeAnnotations.  Other attributes are ignored.
3556     for (int y = 0; y < attributes_count; y++) {
3557       cfs->guarantee_more(6, CHECK_0);  // attribute_name_index, attribute_length
3558       const u2 attribute_name_index = cfs->get_u2_fast();
3559       const u4 attribute_length = cfs->get_u4_fast();
3560       calculate_attr_size += 6;
3561       check_property(
3562         valid_symbol_at(attribute_name_index),
3563         "Invalid Record attribute name index %u in class file %s",
3564         attribute_name_index, CHECK_0);
3565 
3566       const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3567       if (attribute_name == vmSymbols::tag_signature()) {
3568         if (generic_sig_index != 0) {
3569           classfile_parse_error(
3570             "Multiple Signature attributes for Record component in class file %s",
3571             THREAD);
3572           return 0;
3573         }
3574         if (attribute_length != 2) {
3575           classfile_parse_error(
3576             "Invalid Signature attribute length %u in Record component in class file %s",
3577             attribute_length, THREAD);
3578           return 0;
3579         }
3580         generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3581 
3582       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3583         if (runtime_visible_annotations != NULL) {
3584           classfile_parse_error(
3585             "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3586           return 0;
3587         }
3588         runtime_visible_annotations_length = attribute_length;
3589         runtime_visible_annotations = cfs->current();
3590 
3591         assert(runtime_visible_annotations != NULL, "null record component visible annotation");
3592         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3593         cfs->skip_u1_fast(runtime_visible_annotations_length);
3594 
3595       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3596         if (runtime_invisible_annotations_exists) {
3597           classfile_parse_error(
3598             "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3599           return 0;
3600         }
3601         runtime_invisible_annotations_exists = true;
3602         if (PreserveAllAnnotations) {
3603           runtime_invisible_annotations_length = attribute_length;
3604           runtime_invisible_annotations = cfs->current();
3605           assert(runtime_invisible_annotations != NULL, "null record component invisible annotation");
3606         }
3607         cfs->skip_u1(attribute_length, CHECK_0);
3608 
3609       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3610         if (runtime_visible_type_annotations != NULL) {
3611           classfile_parse_error(
3612             "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3613           return 0;
3614         }
3615         runtime_visible_type_annotations_length = attribute_length;
3616         runtime_visible_type_annotations = cfs->current();
3617 
3618         assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation");
3619         cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3620         cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3621 
3622       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3623         if (runtime_invisible_type_annotations_exists) {
3624           classfile_parse_error(
3625             "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3626           return 0;
3627         }
3628         runtime_invisible_type_annotations_exists = true;
3629         if (PreserveAllAnnotations) {
3630           runtime_invisible_type_annotations_length = attribute_length;
3631           runtime_invisible_type_annotations = cfs->current();
3632           assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation");
3633         }
3634         cfs->skip_u1(attribute_length, CHECK_0);
3635 
3636       } else {
3637         // Skip unknown attributes
3638         cfs->skip_u1(attribute_length, CHECK_0);
3639       }
3640       calculate_attr_size += attribute_length;
3641     } // End of attributes For loop
3642 
3643     AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3644                                                         runtime_visible_annotations_length,
3645                                                         runtime_invisible_annotations,
3646                                                         runtime_invisible_annotations_length,
3647                                                         CHECK_0);
3648     AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3649                                                              runtime_visible_type_annotations_length,
3650                                                              runtime_invisible_type_annotations,
3651                                                              runtime_invisible_type_annotations_length,
3652                                                              CHECK_0);
3653 
3654     RecordComponent* record_component =
3655       RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3656                                 attributes_count, generic_sig_index,
3657                                 annotations, type_annotations, CHECK_0);
3658     record_components->at_put(x, record_component);
3659   }  // End of component processing loop
3660 
3661   // Restore buffer's current position.
3662   cfs->set_current(current_mark);
3663   return calculate_attr_size;
3664 }
3665 
3666 void ClassFileParser::parse_classfile_synthetic_attribute() {
3667   set_class_synthetic_flag(true);
3668 }
3669 
3670 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3671   assert(cfs != NULL, "invariant");
3672 
3673   const u2 signature_index = cfs->get_u2(CHECK);
3674   check_property(
3675     valid_symbol_at(signature_index),
3676     "Invalid constant pool index %u in Signature attribute in class file %s",
3677     signature_index, CHECK);
3678   set_class_generic_signature_index(signature_index);
3679 }
3680 
3681 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3682                                                                   ConstantPool* cp,
3683                                                                   u4 attribute_byte_length,
3684                                                                   TRAPS) {
3685   assert(cfs != NULL, "invariant");
3686   assert(cp != NULL, "invariant");
3687 
3688   const u1* const current_start = cfs->current();
3689 
3690   guarantee_property(attribute_byte_length >= sizeof(u2),
3691                      "Invalid BootstrapMethods attribute length %u in class file %s",
3692                      attribute_byte_length,
3693                      CHECK);
3694 
3695   cfs->guarantee_more(attribute_byte_length, CHECK);
3696 
3697   const int attribute_array_length = cfs->get_u2_fast();
3698 
3699   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3700                      "Short length on BootstrapMethods in class file %s",
3701                      CHECK);
3702 
3703 
3704   // The attribute contains a counted array of counted tuples of shorts,
3705   // represending bootstrap specifiers:
3706   //    length*{bootstrap_method_index, argument_count*{argument_index}}
3707   const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3708   // operand_count = number of shorts in attr, except for leading length
3709 
3710   // The attribute is copied into a short[] array.
3711   // The array begins with a series of short[2] pairs, one for each tuple.
3712   const int index_size = (attribute_array_length * 2);
3713 
3714   Array<u2>* const operands =
3715     MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3716 
3717   // Eagerly assign operands so they will be deallocated with the constant
3718   // pool if there is an error.
3719   cp->set_operands(operands);
3720 
3721   int operand_fill_index = index_size;
3722   const int cp_size = cp->length();
3723 
3724   for (int n = 0; n < attribute_array_length; n++) {
3725     // Store a 32-bit offset into the header of the operand array.
3726     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3727 
3728     // Read a bootstrap specifier.
3729     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3730     const u2 bootstrap_method_index = cfs->get_u2_fast();
3731     const u2 argument_count = cfs->get_u2_fast();
3732     check_property(
3733       valid_cp_range(bootstrap_method_index, cp_size) &&
3734       cp->tag_at(bootstrap_method_index).is_method_handle(),
3735       "bootstrap_method_index %u has bad constant type in class file %s",
3736       bootstrap_method_index,
3737       CHECK);
3738 
3739     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3740       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3741       CHECK);
3742 
3743     operands->at_put(operand_fill_index++, bootstrap_method_index);
3744     operands->at_put(operand_fill_index++, argument_count);
3745 
3746     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
3747     for (int j = 0; j < argument_count; j++) {
3748       const u2 argument_index = cfs->get_u2_fast();
3749       check_property(
3750         valid_cp_range(argument_index, cp_size) &&
3751         cp->tag_at(argument_index).is_loadable_constant(),
3752         "argument_index %u has bad constant type in class file %s",
3753         argument_index,
3754         CHECK);
3755       operands->at_put(operand_fill_index++, argument_index);
3756     }
3757   }
3758   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3759                      "Bad length on BootstrapMethods in class file %s",
3760                      CHECK);
3761 }
3762 
3763 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3764                                                  ConstantPool* cp,
3765                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3766                                                  TRAPS) {
3767   assert(cfs != NULL, "invariant");
3768   assert(cp != NULL, "invariant");
3769   assert(parsed_annotations != NULL, "invariant");
3770 
3771   // Set inner classes attribute to default sentinel
3772   _inner_classes = Universe::the_empty_short_array();
3773   // Set nest members attribute to default sentinel
3774   _nest_members = Universe::the_empty_short_array();
3775   // Set _permitted_subclasses attribute to default sentinel
3776   _permitted_subclasses = Universe::the_empty_short_array();
3777   // Set _preload_classes attribute to default sentinel
3778   _preload_classes = Universe::the_empty_short_array();
3779   cfs->guarantee_more(2, CHECK);  // attributes_count
3780   u2 attributes_count = cfs->get_u2_fast();
3781   bool parsed_sourcefile_attribute = false;
3782   bool parsed_innerclasses_attribute = false;
3783   bool parsed_nest_members_attribute = false;
3784   bool parsed_permitted_subclasses_attribute = false;
3785   bool parsed_preload_attribute = false;
3786   bool parsed_nest_host_attribute = false;
3787   bool parsed_record_attribute = false;
3788   bool parsed_enclosingmethod_attribute = false;
3789   bool parsed_bootstrap_methods_attribute = false;
3790   const u1* runtime_visible_annotations = NULL;
3791   int runtime_visible_annotations_length = 0;
3792   const u1* runtime_invisible_annotations = NULL;
3793   int runtime_invisible_annotations_length = 0;
3794   const u1* runtime_visible_type_annotations = NULL;
3795   int runtime_visible_type_annotations_length = 0;
3796   const u1* runtime_invisible_type_annotations = NULL;
3797   int runtime_invisible_type_annotations_length = 0;
3798   bool runtime_invisible_type_annotations_exists = false;
3799   bool runtime_invisible_annotations_exists = false;
3800   bool parsed_source_debug_ext_annotations_exist = false;
3801   const u1* inner_classes_attribute_start = NULL;
3802   u4  inner_classes_attribute_length = 0;
3803   u2  enclosing_method_class_index = 0;
3804   u2  enclosing_method_method_index = 0;
3805   const u1* nest_members_attribute_start = NULL;
3806   u4  nest_members_attribute_length = 0;
3807   const u1* record_attribute_start = NULL;
3808   u4  record_attribute_length = 0;
3809   const u1* permitted_subclasses_attribute_start = NULL;
3810   u4  permitted_subclasses_attribute_length = 0;
3811   const u1* preload_attribute_start = NULL;
3812   u4  preload_attribute_length = 0;
3813 
3814   // Iterate over attributes
3815   while (attributes_count--) {
3816     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3817     const u2 attribute_name_index = cfs->get_u2_fast();
3818     const u4 attribute_length = cfs->get_u4_fast();
3819     check_property(
3820       valid_symbol_at(attribute_name_index),
3821       "Attribute name has bad constant pool index %u in class file %s",
3822       attribute_name_index, CHECK);
3823     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3824     if (tag == vmSymbols::tag_source_file()) {
3825       // Check for SourceFile tag
3826       if (_need_verify) {
3827         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3828       }
3829       if (parsed_sourcefile_attribute) {
3830         classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3831         return;
3832       } else {
3833         parsed_sourcefile_attribute = true;
3834       }
3835       parse_classfile_sourcefile_attribute(cfs, CHECK);
3836     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3837       // Check for SourceDebugExtension tag
3838       if (parsed_source_debug_ext_annotations_exist) {
3839         classfile_parse_error(
3840           "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3841         return;
3842       }
3843       parsed_source_debug_ext_annotations_exist = true;
3844       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3845     } else if (tag == vmSymbols::tag_inner_classes()) {
3846       // Check for InnerClasses tag
3847       if (parsed_innerclasses_attribute) {
3848         classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3849         return;
3850       } else {
3851         parsed_innerclasses_attribute = true;
3852       }
3853       inner_classes_attribute_start = cfs->current();
3854       inner_classes_attribute_length = attribute_length;
3855       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3856     } else if (tag == vmSymbols::tag_synthetic()) {
3857       // Check for Synthetic tag
3858       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3859       if (attribute_length != 0) {
3860         classfile_parse_error(
3861           "Invalid Synthetic classfile attribute length %u in class file %s",
3862           attribute_length, THREAD);
3863         return;
3864       }
3865       parse_classfile_synthetic_attribute();
3866     } else if (tag == vmSymbols::tag_deprecated()) {
3867       // Check for Deprecated tag - 4276120
3868       if (attribute_length != 0) {
3869         classfile_parse_error(
3870           "Invalid Deprecated classfile attribute length %u in class file %s",
3871           attribute_length, THREAD);
3872         return;
3873       }
3874     } else if (_major_version >= JAVA_1_5_VERSION) {
3875       if (tag == vmSymbols::tag_signature()) {
3876         if (_generic_signature_index != 0) {
3877           classfile_parse_error(
3878             "Multiple Signature attributes in class file %s", THREAD);
3879           return;
3880         }
3881         if (attribute_length != 2) {
3882           classfile_parse_error(
3883             "Wrong Signature attribute length %u in class file %s",
3884             attribute_length, THREAD);
3885           return;
3886         }
3887         parse_classfile_signature_attribute(cfs, CHECK);
3888       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3889         if (runtime_visible_annotations != NULL) {
3890           classfile_parse_error(
3891             "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3892           return;
3893         }
3894         runtime_visible_annotations_length = attribute_length;
3895         runtime_visible_annotations = cfs->current();
3896         assert(runtime_visible_annotations != NULL, "null visible annotations");
3897         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3898         parse_annotations(cp,
3899                           runtime_visible_annotations,
3900                           runtime_visible_annotations_length,
3901                           parsed_annotations,
3902                           _loader_data,
3903                           _can_access_vm_annotations);
3904         cfs->skip_u1_fast(runtime_visible_annotations_length);
3905       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3906         if (runtime_invisible_annotations_exists) {
3907           classfile_parse_error(
3908             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3909           return;
3910         }
3911         runtime_invisible_annotations_exists = true;
3912         if (PreserveAllAnnotations) {
3913           runtime_invisible_annotations_length = attribute_length;
3914           runtime_invisible_annotations = cfs->current();
3915           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3916         }
3917         cfs->skip_u1(attribute_length, CHECK);
3918       } else if (tag == vmSymbols::tag_enclosing_method()) {
3919         if (parsed_enclosingmethod_attribute) {
3920           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3921           return;
3922         } else {
3923           parsed_enclosingmethod_attribute = true;
3924         }
3925         guarantee_property(attribute_length == 4,
3926           "Wrong EnclosingMethod attribute length %u in class file %s",
3927           attribute_length, CHECK);
3928         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3929         enclosing_method_class_index  = cfs->get_u2_fast();
3930         enclosing_method_method_index = cfs->get_u2_fast();
3931         if (enclosing_method_class_index == 0) {
3932           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3933           return;
3934         }
3935         // Validate the constant pool indices and types
3936         check_property(valid_klass_reference_at(enclosing_method_class_index),
3937           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3938         if (enclosing_method_method_index != 0 &&
3939             (!cp->is_within_bounds(enclosing_method_method_index) ||
3940              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3941           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3942           return;
3943         }
3944       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3945                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3946         if (parsed_bootstrap_methods_attribute) {
3947           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3948           return;
3949         }
3950         parsed_bootstrap_methods_attribute = true;
3951         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3952       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3953         if (runtime_visible_type_annotations != NULL) {
3954           classfile_parse_error(
3955             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3956           return;
3957         }
3958         runtime_visible_type_annotations_length = attribute_length;
3959         runtime_visible_type_annotations = cfs->current();
3960         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3961         // No need for the VM to parse Type annotations
3962         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3963       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3964         if (runtime_invisible_type_annotations_exists) {
3965           classfile_parse_error(
3966             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3967           return;
3968         } else {
3969           runtime_invisible_type_annotations_exists = true;
3970         }
3971         if (PreserveAllAnnotations) {
3972           runtime_invisible_type_annotations_length = attribute_length;
3973           runtime_invisible_type_annotations = cfs->current();
3974           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3975         }
3976         cfs->skip_u1(attribute_length, CHECK);
3977       } else if (_major_version >= JAVA_11_VERSION) {
3978         if (tag == vmSymbols::tag_nest_members()) {
3979           // Check for NestMembers tag
3980           if (parsed_nest_members_attribute) {
3981             classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3982             return;
3983           } else {
3984             parsed_nest_members_attribute = true;
3985           }
3986           if (parsed_nest_host_attribute) {
3987             classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3988             return;
3989           }
3990           nest_members_attribute_start = cfs->current();
3991           nest_members_attribute_length = attribute_length;
3992           cfs->skip_u1(nest_members_attribute_length, CHECK);
3993         } else if (tag == vmSymbols::tag_nest_host()) {
3994           if (parsed_nest_host_attribute) {
3995             classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3996             return;
3997           } else {
3998             parsed_nest_host_attribute = true;
3999           }
4000           if (parsed_nest_members_attribute) {
4001             classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
4002             return;
4003           }
4004           if (_need_verify) {
4005             guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
4006           }
4007           cfs->guarantee_more(2, CHECK);
4008           u2 class_info_index = cfs->get_u2_fast();
4009           check_property(
4010                          valid_klass_reference_at(class_info_index),
4011                          "Nest-host class_info_index %u has bad constant type in class file %s",
4012                          class_info_index, CHECK);
4013           _nest_host = class_info_index;
4014 
4015         } else if (_major_version >= JAVA_16_VERSION) {
4016           if (tag == vmSymbols::tag_record()) {
4017             if (parsed_record_attribute) {
4018               classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
4019               return;
4020             }
4021             parsed_record_attribute = true;
4022             record_attribute_start = cfs->current();
4023             record_attribute_length = attribute_length;
4024           } else if (_major_version >= JAVA_17_VERSION) {
4025             if (tag == vmSymbols::tag_permitted_subclasses()) {
4026               if (parsed_permitted_subclasses_attribute) {
4027                 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
4028                 return;
4029               }
4030               // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
4031               if (_access_flags.is_final()) {
4032                 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
4033                 return;
4034               }
4035               parsed_permitted_subclasses_attribute = true;
4036               permitted_subclasses_attribute_start = cfs->current();
4037               permitted_subclasses_attribute_length = attribute_length;
4038             }
4039             if (EnableValhalla && tag == vmSymbols::tag_preload()) {
4040               if (parsed_preload_attribute) {
4041                 classfile_parse_error("Multiple Preload attributes in class file %s", CHECK);
4042                 return;
4043               }
4044               parsed_preload_attribute = true;
4045               preload_attribute_start = cfs->current();
4046               preload_attribute_length = attribute_length;
4047             }
4048           }
4049           // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
4050           cfs->skip_u1(attribute_length, CHECK);
4051         } else {
4052           // Unknown attribute
4053           cfs->skip_u1(attribute_length, CHECK);
4054         }
4055       } else {
4056         // Unknown attribute
4057         cfs->skip_u1(attribute_length, CHECK);
4058       }
4059     } else {
4060       // Unknown attribute
4061       cfs->skip_u1(attribute_length, CHECK);
4062     }
4063   }
4064   _class_annotations = assemble_annotations(runtime_visible_annotations,
4065                                             runtime_visible_annotations_length,
4066                                             runtime_invisible_annotations,
4067                                             runtime_invisible_annotations_length,
4068                                             CHECK);
4069   _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
4070                                                  runtime_visible_type_annotations_length,
4071                                                  runtime_invisible_type_annotations,
4072                                                  runtime_invisible_type_annotations_length,
4073                                                  CHECK);
4074 
4075   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
4076     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
4077                             cfs,
4078                             cp,
4079                             inner_classes_attribute_start,
4080                             parsed_innerclasses_attribute,
4081                             enclosing_method_class_index,
4082                             enclosing_method_method_index,
4083                             CHECK);
4084     if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
4085       guarantee_property(
4086         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
4087         "Wrong InnerClasses attribute length in class file %s", CHECK);
4088     }
4089   }
4090 
4091   if (parsed_nest_members_attribute) {
4092     const u2 num_of_classes = parse_classfile_nest_members_attribute(
4093                             cfs,
4094                             nest_members_attribute_start,
4095                             CHECK);
4096     if (_need_verify) {
4097       guarantee_property(
4098         nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
4099         "Wrong NestMembers attribute length in class file %s", CHECK);
4100     }
4101   }
4102 
4103   if (parsed_record_attribute) {
4104     const unsigned int calculated_attr_length = parse_classfile_record_attribute(
4105                             cfs,
4106                             cp,
4107                             record_attribute_start,
4108                             CHECK);
4109     if (_need_verify) {
4110       guarantee_property(record_attribute_length == calculated_attr_length,
4111                          "Record attribute has wrong length in class file %s",
4112                          CHECK);
4113     }
4114   }
4115 
4116   if (parsed_permitted_subclasses_attribute) {
4117     const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
4118                             cfs,
4119                             permitted_subclasses_attribute_start,
4120                             CHECK);
4121     if (_need_verify) {
4122       guarantee_property(
4123         permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
4124         "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
4125     }
4126   }
4127 
4128   if (parsed_preload_attribute) {
4129     const u2 num_classes = parse_classfile_preload_attribute(
4130                             cfs,
4131                             preload_attribute_start,
4132                             CHECK);
4133     if (_need_verify) {
4134       guarantee_property(
4135         preload_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
4136         "Wrong Preload attribute length in class file %s", CHECK);
4137     }
4138   }
4139 
4140   if (_max_bootstrap_specifier_index >= 0) {
4141     guarantee_property(parsed_bootstrap_methods_attribute,
4142                        "Missing BootstrapMethods attribute in class file %s", CHECK);
4143   }
4144 }
4145 
4146 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
4147   assert(k != NULL, "invariant");
4148 
4149   if (_synthetic_flag)
4150     k->set_is_synthetic();
4151   if (_sourcefile_index != 0) {
4152     k->set_source_file_name_index(_sourcefile_index);
4153   }
4154   if (_generic_signature_index != 0) {
4155     k->set_generic_signature_index(_generic_signature_index);
4156   }
4157   if (_sde_buffer != NULL) {
4158     k->set_source_debug_extension(_sde_buffer, _sde_length);
4159   }
4160 }
4161 
4162 // Create the Annotations object that will
4163 // hold the annotations array for the Klass.
4164 void ClassFileParser::create_combined_annotations(TRAPS) {
4165     if (_class_annotations == NULL &&
4166         _class_type_annotations == NULL &&
4167         _fields_annotations == NULL &&
4168         _fields_type_annotations == NULL) {
4169       // Don't create the Annotations object unnecessarily.
4170       return;
4171     }
4172 
4173     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
4174     annotations->set_class_annotations(_class_annotations);
4175     annotations->set_class_type_annotations(_class_type_annotations);
4176     annotations->set_fields_annotations(_fields_annotations);
4177     annotations->set_fields_type_annotations(_fields_type_annotations);
4178 
4179     // This is the Annotations object that will be
4180     // assigned to InstanceKlass being constructed.
4181     _combined_annotations = annotations;
4182 
4183     // The annotations arrays below has been transferred the
4184     // _combined_annotations so these fields can now be cleared.
4185     _class_annotations       = NULL;
4186     _class_type_annotations  = NULL;
4187     _fields_annotations      = NULL;
4188     _fields_type_annotations = NULL;
4189 }
4190 
4191 // Transfer ownership of metadata allocated to the InstanceKlass.
4192 void ClassFileParser::apply_parsed_class_metadata(
4193                                             InstanceKlass* this_klass,
4194                                             int java_fields_count) {
4195   assert(this_klass != NULL, "invariant");
4196 
4197   _cp->set_pool_holder(this_klass);
4198   this_klass->set_constants(_cp);
4199   this_klass->set_fields(_fields, java_fields_count);
4200   this_klass->set_methods(_methods);
4201   this_klass->set_inner_classes(_inner_classes);
4202   this_klass->set_nest_members(_nest_members);
4203   this_klass->set_nest_host_index(_nest_host);
4204   this_klass->set_preload_classes(_preload_classes);
4205   this_klass->set_annotations(_combined_annotations);
4206   this_klass->set_permitted_subclasses(_permitted_subclasses);
4207   this_klass->set_record_components(_record_components);
4208   // Delay the setting of _local_interfaces and _transitive_interfaces until after
4209   // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
4210   // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
4211   // its _super. If an OOM occurs while loading the current klass, its _super field
4212   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
4213   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
4214   // dereferences to the deallocated _transitive_interfaces will result in a crash.
4215 
4216   // Clear out these fields so they don't get deallocated by the destructor
4217   clear_class_metadata();
4218 }
4219 
4220 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
4221                                                        int runtime_visible_annotations_length,
4222                                                        const u1* const runtime_invisible_annotations,
4223                                                        int runtime_invisible_annotations_length,
4224                                                        TRAPS) {
4225   AnnotationArray* annotations = NULL;
4226   if (runtime_visible_annotations != NULL ||
4227       runtime_invisible_annotations != NULL) {
4228     annotations = MetadataFactory::new_array<u1>(_loader_data,
4229                                           runtime_visible_annotations_length +
4230                                           runtime_invisible_annotations_length,
4231                                           CHECK_(annotations));
4232     if (runtime_visible_annotations != NULL) {
4233       for (int i = 0; i < runtime_visible_annotations_length; i++) {
4234         annotations->at_put(i, runtime_visible_annotations[i]);
4235       }
4236     }
4237     if (runtime_invisible_annotations != NULL) {
4238       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4239         int append = runtime_visible_annotations_length+i;
4240         annotations->at_put(append, runtime_invisible_annotations[i]);
4241       }
4242     }
4243   }
4244   return annotations;
4245 }
4246 
4247 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4248                                                         const int super_class_index,
4249                                                         const bool need_verify,
4250                                                         TRAPS) {
4251   assert(cp != NULL, "invariant");
4252   const InstanceKlass* super_klass = NULL;
4253 
4254   if (super_class_index == 0) {
4255     check_property(_class_name == vmSymbols::java_lang_Object(),
4256                    "Invalid superclass index 0 in class file %s",
4257                    CHECK_NULL);
4258   } else {
4259     check_property(valid_klass_reference_at(super_class_index),
4260                    "Invalid superclass index %u in class file %s",
4261                    super_class_index,
4262                    CHECK_NULL);
4263     // The class name should be legal because it is checked when parsing constant pool.
4264     // However, make sure it is not an array type.
4265     if (cp->tag_at(super_class_index).is_klass()) {
4266       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4267     }
4268     if (need_verify) {
4269       bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4270       guarantee_property(!is_array,
4271                         "Bad superclass name in class file %s", CHECK_NULL);
4272     }
4273   }
4274   return super_klass;
4275 }
4276 
4277 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4278   _max_nonstatic_oop_maps = max_blocks;
4279   _nonstatic_oop_map_count = 0;
4280   if (max_blocks == 0) {
4281     _nonstatic_oop_maps = NULL;
4282   } else {
4283     _nonstatic_oop_maps =
4284         NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4285     memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4286   }
4287 }
4288 
4289 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4290   assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4291   return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4292 }
4293 
4294 // addition of super oop maps
4295 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4296   assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4297          nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4298 
4299   memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4300   _nonstatic_oop_map_count += nof_blocks;
4301 }
4302 
4303 // collection of oops
4304 void OopMapBlocksBuilder::add(int offset, int count) {
4305   if (_nonstatic_oop_map_count == 0) {
4306     _nonstatic_oop_map_count++;
4307   }
4308   OopMapBlock* nonstatic_oop_map = last_oop_map();
4309   if (nonstatic_oop_map->count() == 0) {  // Unused map, set it up
4310     nonstatic_oop_map->set_offset(offset);
4311     nonstatic_oop_map->set_count(count);
4312   } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4313     nonstatic_oop_map->increment_count(count);
4314   } else { // Need a new one...
4315     _nonstatic_oop_map_count++;
4316     assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4317     nonstatic_oop_map = last_oop_map();
4318     nonstatic_oop_map->set_offset(offset);
4319     nonstatic_oop_map->set_count(count);
4320   }
4321 }
4322 
4323 // general purpose copy, e.g. into allocated instanceKlass
4324 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4325   if (_nonstatic_oop_map_count != 0) {
4326     memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4327   }
4328 }
4329 
4330 // Sort and compact adjacent blocks
4331 void OopMapBlocksBuilder::compact() {
4332   if (_nonstatic_oop_map_count <= 1) {
4333     return;
4334   }
4335   /*
4336    * Since field layout sneaks in oops before values, we will be able to condense
4337    * blocks. There is potential to compact between super, own refs and values
4338    * containing refs.
4339    *
4340    * Currently compaction is slightly limited due to values being 8 byte aligned.
4341    * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4342    * and maybe it doesn't need to be.
4343    */
4344   qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4345         (_sort_Fn)OopMapBlock::compare_offset);
4346   if (_nonstatic_oop_map_count < 2) {
4347     return;
4348   }
4349 
4350   // Make a temp copy, and iterate through and copy back into the original
4351   ResourceMark rm;
4352   OopMapBlock* oop_maps_copy =
4353       NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4354   OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4355   copy(oop_maps_copy);
4356   OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4357   unsigned int new_count = 1;
4358   oop_maps_copy++;
4359   while(oop_maps_copy < oop_maps_copy_end) {
4360     assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4361     if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4362       nonstatic_oop_map->increment_count(oop_maps_copy->count());
4363     } else {
4364       nonstatic_oop_map++;
4365       new_count++;
4366       nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4367       nonstatic_oop_map->set_count(oop_maps_copy->count());
4368     }
4369     oop_maps_copy++;
4370   }
4371   assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4372   _nonstatic_oop_map_count = new_count;
4373 }
4374 
4375 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4376   st->print_cr("  OopMapBlocks: %3d  /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4377   if (_nonstatic_oop_map_count > 0) {
4378     OopMapBlock* map = _nonstatic_oop_maps;
4379     OopMapBlock* last_map = last_oop_map();
4380     assert(map <= last_map, "Last less than first");
4381     while (map <= last_map) {
4382       st->print_cr("    Offset: %3d  -%3d Count: %3d", map->offset(),
4383                    map->offset() + map->offset_span() - heapOopSize, map->count());
4384       map++;
4385     }
4386   }
4387 }
4388 
4389 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4390   print_on(st);
4391 }
4392 
4393 void ClassFileParser::throwInlineTypeLimitation(THREAD_AND_LOCATION_DECL,
4394                                                 const char* msg,
4395                                                 const Symbol* name,
4396                                                 const Symbol* sig) const {
4397 
4398   ResourceMark rm(THREAD);
4399   if (name == NULL || sig == NULL) {
4400     Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4401         vmSymbols::java_lang_ClassFormatError(),
4402         "class: %s - %s", _class_name->as_C_string(), msg);
4403   }
4404   else {
4405     Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4406         vmSymbols::java_lang_ClassFormatError(),
4407         "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4408         _class_name->as_C_string(), msg);
4409   }
4410 }
4411 
4412 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4413   assert(ik != NULL, "invariant");
4414 
4415   const Klass* const super = ik->super();
4416 
4417   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4418   // in which case we don't have to register objects as finalizable
4419   if (!_has_empty_finalizer) {
4420     if (_has_finalizer ||
4421         (super != NULL && super->has_finalizer())) {
4422       ik->set_has_finalizer();
4423     }
4424   }
4425 
4426 #ifdef ASSERT
4427   bool f = false;
4428   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4429                                            vmSymbols::void_method_signature());
4430   if (InstanceKlass::is_finalization_enabled() &&
4431       (m != NULL) && !m->is_empty_method()) {
4432       f = true;
4433   }
4434 
4435   // Spec doesn't prevent agent from redefinition of empty finalizer.
4436   // Despite the fact that it's generally bad idea and redefined finalizer
4437   // will not work as expected we shouldn't abort vm in this case
4438   if (!ik->has_redefined_this_or_super()) {
4439     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4440   }
4441 #endif
4442 
4443   // Check if this klass supports the java.lang.Cloneable interface
4444   if (vmClasses::Cloneable_klass_loaded()) {
4445     if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4446       if (ik->is_inline_klass()) {
4447         JavaThread *THREAD = JavaThread::current();
4448         throwInlineTypeLimitation(THREAD_AND_LOCATION, "Inline Types do not support Cloneable");
4449         return;
4450       }
4451       ik->set_is_cloneable();
4452     }
4453   }
4454 
4455   // Check if this klass has a vanilla default constructor
4456   if (super == NULL) {
4457     // java.lang.Object has empty default constructor
4458     ik->set_has_vanilla_constructor();
4459   } else {
4460     if (super->has_vanilla_constructor() &&
4461         _has_vanilla_constructor) {
4462       ik->set_has_vanilla_constructor();
4463     }
4464 #ifdef ASSERT
4465     bool v = false;
4466     if (super->has_vanilla_constructor()) {
4467       const Method* const constructor =
4468         ik->find_method(vmSymbols::object_initializer_name(),
4469                        vmSymbols::void_method_signature());
4470       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4471         v = true;
4472       }
4473     }
4474     assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4475 #endif
4476   }
4477 
4478   // If it cannot be fast-path allocated, set a bit in the layout helper.
4479   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4480   assert(ik->size_helper() > 0, "layout_helper is initialized");
4481   if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4482       || ik->is_abstract() || ik->is_interface()
4483       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4484       || ik->size_helper() >= FastAllocateSizeLimit) {
4485     // Forbid fast-path allocation.
4486     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4487     ik->set_layout_helper(lh);
4488   }
4489 }
4490 
4491 bool ClassFileParser::supports_inline_types() const {
4492   // Inline types are only supported by class file version 61.65535 and later
4493   return _major_version > JAVA_21_VERSION ||
4494          (_major_version == JAVA_21_VERSION /*&& _minor_version == JAVA_PREVIEW_MINOR_VERSION*/); // JAVA_PREVIEW_MINOR_VERSION not yet implemented by javac, check JVMS draft
4495 }
4496 
4497 // utility methods for appending an array with check for duplicates
4498 
4499 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4500                               const Array<InstanceKlass*>* const ifs) {
4501   // iterate over new interfaces
4502   for (int i = 0; i < ifs->length(); i++) {
4503     InstanceKlass* const e = ifs->at(i);
4504     assert(e->is_klass() && e->is_interface(), "just checking");
4505     // add new interface
4506     result->append_if_missing(e);
4507   }
4508 }
4509 
4510 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4511                                                             Array<InstanceKlass*>* local_ifs,
4512                                                             ClassLoaderData* loader_data,
4513                                                             TRAPS) {
4514   assert(local_ifs != NULL, "invariant");
4515   assert(loader_data != NULL, "invariant");
4516 
4517   // Compute maximum size for transitive interfaces
4518   int max_transitive_size = 0;
4519   int super_size = 0;
4520   // Add superclass transitive interfaces size
4521   if (super != NULL) {
4522     super_size = super->transitive_interfaces()->length();
4523     max_transitive_size += super_size;
4524   }
4525   // Add local interfaces' super interfaces
4526   const int local_size = local_ifs->length();
4527   for (int i = 0; i < local_size; i++) {
4528     InstanceKlass* const l = local_ifs->at(i);
4529     max_transitive_size += l->transitive_interfaces()->length();
4530   }
4531   // Finally add local interfaces
4532   max_transitive_size += local_size;
4533   // Construct array
4534   if (max_transitive_size == 0) {
4535     // no interfaces, use canonicalized array
4536     return Universe::the_empty_instance_klass_array();
4537   } else if (max_transitive_size == super_size) {
4538     // no new local interfaces added, share superklass' transitive interface array
4539     return super->transitive_interfaces();
4540     // The three lines below are commented to work around bug JDK-8245487
4541 //  } else if (max_transitive_size == local_size) {
4542 //    // only local interfaces added, share local interface array
4543 //    return local_ifs;
4544   } else {
4545     ResourceMark rm;
4546     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4547 
4548     // Copy down from superclass
4549     if (super != NULL) {
4550       append_interfaces(result, super->transitive_interfaces());
4551     }
4552 
4553     // Copy down from local interfaces' superinterfaces
4554     for (int i = 0; i < local_size; i++) {
4555       InstanceKlass* const l = local_ifs->at(i);
4556       append_interfaces(result, l->transitive_interfaces());
4557     }
4558     // Finally add local interfaces
4559     append_interfaces(result, local_ifs);
4560 
4561     // length will be less than the max_transitive_size if duplicates were removed
4562     const int length = result->length();
4563     assert(length <= max_transitive_size, "just checking");
4564 
4565     Array<InstanceKlass*>* const new_result =
4566       MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4567     for (int i = 0; i < length; i++) {
4568       InstanceKlass* const e = result->at(i);
4569       assert(e != NULL, "just checking");
4570       new_result->at_put(i, e);
4571     }
4572     return new_result;
4573   }
4574 }
4575 
4576 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4577   assert(this_klass != NULL, "invariant");
4578   const Klass* const super = this_klass->super();
4579 
4580   if (super != NULL) {
4581     const InstanceKlass* super_ik = InstanceKlass::cast(super);
4582 
4583     if (super->is_final()) {
4584       classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4585       return;
4586     }
4587 
4588     if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4589       classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4590       return;
4591     }
4592 
4593     // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4594     // flag set. But, java.lang.Object must still be allowed to be a direct super class
4595     // for a value classes.  So, it is treated as a special case for now.
4596     if (this_klass->access_flags().is_value_class() &&
4597         super_ik->name() != vmSymbols::java_lang_Object() &&
4598         super_ik->is_identity_class()) {
4599       classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4600       return;
4601     }
4602 
4603     // If the loader is not the boot loader then throw an exception if its
4604     // superclass is in package jdk.internal.reflect and its loader is not a
4605     // special reflection class loader
4606     if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4607       PackageEntry* super_package = super->package();
4608       if (super_package != NULL &&
4609           super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4610           !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4611         ResourceMark rm(THREAD);
4612         Exceptions::fthrow(
4613           THREAD_AND_LOCATION,
4614           vmSymbols::java_lang_IllegalAccessError(),
4615           "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4616           this_klass->external_name(),
4617           this_klass->class_loader_data()->loader_name_and_id(),
4618           super->external_name());
4619         return;
4620       }
4621     }
4622 
4623     Reflection::VerifyClassAccessResults vca_result =
4624       Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4625     if (vca_result != Reflection::ACCESS_OK) {
4626       ResourceMark rm(THREAD);
4627       char* msg = Reflection::verify_class_access_msg(this_klass,
4628                                                       InstanceKlass::cast(super),
4629                                                       vca_result);
4630       if (msg == NULL) {
4631         bool same_module = (this_klass->module() == super->module());
4632         Exceptions::fthrow(
4633           THREAD_AND_LOCATION,
4634           vmSymbols::java_lang_IllegalAccessError(),
4635           "class %s cannot access its %ssuperclass %s (%s%s%s)",
4636           this_klass->external_name(),
4637           super->is_abstract() ? "abstract " : "",
4638           super->external_name(),
4639           (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4640           (same_module) ? "" : "; ",
4641           (same_module) ? "" : super->class_in_module_of_loader());
4642       } else {
4643         // Add additional message content.
4644         Exceptions::fthrow(
4645           THREAD_AND_LOCATION,
4646           vmSymbols::java_lang_IllegalAccessError(),
4647           "superclass access check failed: %s",
4648           msg);
4649       }
4650     }
4651   }
4652 }
4653 
4654 
4655 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4656   assert(this_klass != NULL, "invariant");
4657   const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4658   const int lng = local_interfaces->length();
4659   for (int i = lng - 1; i >= 0; i--) {
4660     InstanceKlass* const k = local_interfaces->at(i);
4661     assert (k != NULL && k->is_interface(), "invalid interface");
4662 
4663     if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4664       classfile_icce_error(this_klass->is_interface() ?
4665                              "class %s cannot extend sealed interface %s" :
4666                              "class %s cannot implement sealed interface %s",
4667                            k, THREAD);
4668       return;
4669     }
4670 
4671     Reflection::VerifyClassAccessResults vca_result =
4672       Reflection::verify_class_access(this_klass, k, false);
4673     if (vca_result != Reflection::ACCESS_OK) {
4674       ResourceMark rm(THREAD);
4675       char* msg = Reflection::verify_class_access_msg(this_klass,
4676                                                       k,
4677                                                       vca_result);
4678       if (msg == NULL) {
4679         bool same_module = (this_klass->module() == k->module());
4680         Exceptions::fthrow(
4681           THREAD_AND_LOCATION,
4682           vmSymbols::java_lang_IllegalAccessError(),
4683           "class %s cannot access its superinterface %s (%s%s%s)",
4684           this_klass->external_name(),
4685           k->external_name(),
4686           (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4687           (same_module) ? "" : "; ",
4688           (same_module) ? "" : k->class_in_module_of_loader());
4689       } else {
4690         // Add additional message content.
4691         Exceptions::fthrow(
4692           THREAD_AND_LOCATION,
4693           vmSymbols::java_lang_IllegalAccessError(),
4694           "superinterface check failed: %s",
4695           msg);
4696       }
4697     }
4698   }
4699 }
4700 
4701 
4702 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4703   assert(this_klass != NULL, "invariant");
4704   const Array<Method*>* const methods = this_klass->methods();
4705   const int num_methods = methods->length();
4706 
4707   // go thru each method and check if it overrides a final method
4708   for (int index = 0; index < num_methods; index++) {
4709     const Method* const m = methods->at(index);
4710 
4711     // skip private, static, and <init> methods
4712     if ((!m->is_private() && !m->is_static()) &&
4713         (m->name() != vmSymbols::object_initializer_name())) {
4714 
4715       const Symbol* const name = m->name();
4716       const Symbol* const signature = m->signature();
4717       const Klass* k = this_klass->super();
4718       const Method* super_m = NULL;
4719       while (k != NULL) {
4720         // skip supers that don't have final methods.
4721         if (k->has_final_method()) {
4722           // lookup a matching method in the super class hierarchy
4723           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4724           if (super_m == NULL) {
4725             break; // didn't find any match; get out
4726           }
4727 
4728           if (super_m->is_final() && !super_m->is_static() &&
4729               !super_m->access_flags().is_private()) {
4730             // matching method in super is final, and not static or private
4731             bool can_access = Reflection::verify_member_access(this_klass,
4732                                                                super_m->method_holder(),
4733                                                                super_m->method_holder(),
4734                                                                super_m->access_flags(),
4735                                                               false, false, CHECK);
4736             if (can_access) {
4737               // this class can access super final method and therefore override
4738               ResourceMark rm(THREAD);
4739               THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4740                         err_msg("class %s overrides final method %s.%s%s",
4741                                 this_klass->external_name(),
4742                                 super_m->method_holder()->external_name(),
4743                                 name->as_C_string(),
4744                                 signature->as_C_string()));
4745             }
4746           }
4747 
4748           // continue to look from super_m's holder's super.
4749           k = super_m->method_holder()->super();
4750           continue;
4751         }
4752 
4753         k = k->super();
4754       }
4755     }
4756   }
4757 }
4758 
4759 
4760 // assumes that this_klass is an interface
4761 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4762   assert(this_klass != NULL, "invariant");
4763   assert(this_klass->is_interface(), "not an interface");
4764   const Array<Method*>* methods = this_klass->methods();
4765   const int num_methods = methods->length();
4766 
4767   for (int index = 0; index < num_methods; index++) {
4768     const Method* const m = methods->at(index);
4769     // if m is static and not the init method, throw a verify error
4770     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4771       ResourceMark rm(THREAD);
4772       Exceptions::fthrow(
4773         THREAD_AND_LOCATION,
4774         vmSymbols::java_lang_VerifyError(),
4775         "Illegal static method %s in interface %s",
4776         m->name()->as_C_string(),
4777         this_klass->external_name()
4778       );
4779       return;
4780     }
4781   }
4782 }
4783 
4784 // utility methods for format checking
4785 
4786 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4787   const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4788   const bool is_value_class = (flags & JVM_ACC_VALUE) != 0;
4789   const bool is_primitive_class = (flags & JVM_ACC_PRIMITIVE) != 0;
4790   const bool is_identity_class = (flags & JVM_ACC_IDENTITY) != 0;
4791   const bool is_inner_class = name != NULL;
4792   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4793   if (is_module) {
4794     ResourceMark rm(THREAD);
4795     Exceptions::fthrow(
4796       THREAD_AND_LOCATION,
4797       vmSymbols::java_lang_NoClassDefFoundError(),
4798       "%s is not a class because access_flag ACC_MODULE is set",
4799       _class_name->as_C_string());
4800     return;
4801   }
4802 
4803   if (is_value_class && !EnableValhalla) {
4804       ResourceMark rm(THREAD);
4805       Exceptions::fthrow(
4806         THREAD_AND_LOCATION,
4807         vmSymbols::java_lang_ClassFormatError(),
4808         "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4809         _class_name->as_C_string()
4810       );
4811     return;
4812   }
4813 
4814   if (is_primitive_class && !EnablePrimitiveClasses) {
4815       ResourceMark rm(THREAD);
4816       Exceptions::fthrow(
4817         THREAD_AND_LOCATION,
4818         vmSymbols::java_lang_ClassFormatError(),
4819         "Class modifier ACC_PRIMITIVE in class %s requires option -XX:+EnablePrimitiveClasses",
4820         _class_name->as_C_string()
4821       );
4822     return;
4823   }
4824 
4825   // if (!_need_verify) { return; }
4826 
4827   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4828   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4829   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4830   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4831   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4832   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4833   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4834 
4835   if ((is_abstract && is_final) ||
4836       (is_interface && !is_abstract) ||
4837       (is_interface && major_gte_1_5 && ((is_super && (!EnableValhalla || !supports_inline_types())) || is_enum)) ||   //  ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4838       (!is_interface && major_gte_1_5 && is_annotation) ||
4839       (is_value_class && is_enum) ||
4840       (is_identity_class && is_value_class) ||
4841       (EnableValhalla && supports_inline_types() && !is_module && !is_abstract && !is_Object && !(is_identity_class || is_value_class) && !is_inner_class) ||
4842       (EnablePrimitiveClasses && supports_inline_types() && is_primitive_class && (!is_value_class || !is_final || is_interface || is_abstract))) {
4843     ResourceMark rm(THREAD);
4844     const char* class_note = "";
4845     if (is_value_class)  class_note = " (a value class)";
4846     if (is_primitive_class)  class_note = " (a primitive class)";
4847     if (is_value_class && is_identity_class) class_note = " (a value and identity class)";
4848     if (name == NULL) { // Not an inner class
4849       Exceptions::fthrow(
4850         THREAD_AND_LOCATION,
4851         vmSymbols::java_lang_ClassFormatError(),
4852         "Illegal class modifiers in class %s%s: 0x%X",
4853         _class_name->as_C_string(), class_note, flags
4854       );
4855       return;
4856     } else {
4857       Exceptions::fthrow(
4858         THREAD_AND_LOCATION,
4859         vmSymbols::java_lang_ClassFormatError(),
4860         "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4861         name, class_note, _class_name->as_C_string(), flags
4862       );
4863       return;
4864     }
4865   }
4866 }
4867 
4868 static bool has_illegal_visibility(jint flags) {
4869   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4870   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4871   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4872 
4873   return ((is_public && is_protected) ||
4874           (is_public && is_private) ||
4875           (is_protected && is_private));
4876 }
4877 
4878 // A legal major_version.minor_version must be one of the following:
4879 //
4880 //  Major_version >= 45 and major_version < 56, any minor_version.
4881 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4882 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4883 //
4884 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4885   ResourceMark rm(THREAD);
4886   const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4887   if (major < JAVA_MIN_SUPPORTED_VERSION) {
4888     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4889                          class_name, major, minor, THREAD);
4890     return;
4891   }
4892 
4893   if (major > max_version) {
4894     Exceptions::fthrow(
4895       THREAD_AND_LOCATION,
4896       vmSymbols::java_lang_UnsupportedClassVersionError(),
4897       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4898       "this version of the Java Runtime only recognizes class file versions up to %u.0",
4899       class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4900     return;
4901   }
4902 
4903   if (major < JAVA_12_VERSION || minor == 0) {
4904     return;
4905   }
4906 
4907   if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4908     if (major != max_version) {
4909       Exceptions::fthrow(
4910         THREAD_AND_LOCATION,
4911         vmSymbols::java_lang_UnsupportedClassVersionError(),
4912         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4913         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4914         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4915       return;
4916     }
4917 
4918     if (!Arguments::enable_preview()) {
4919       classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4920                            class_name, major, minor, THREAD);
4921       return;
4922     }
4923 
4924   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4925     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4926                          class_name, major, minor, THREAD);
4927   }
4928 }
4929 
4930 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4931                                                    AccessFlags class_access_flags,
4932                                                    TRAPS) const {
4933   if (!_need_verify) { return; }
4934 
4935   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4936   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4937   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4938   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4939   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4940   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4941   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4942   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4943   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4944 
4945   const bool is_interface = class_access_flags.is_interface();
4946   const bool is_abstract = class_access_flags.is_abstract();
4947   const bool is_value_class = class_access_flags.is_value_class();
4948   const bool is_identity_class = class_access_flags.is_identity_class();
4949 
4950   bool is_illegal = false;
4951 
4952   if (is_interface) {
4953     if (!is_public || !is_static || !is_final || is_private ||
4954         is_protected || is_volatile || is_transient ||
4955         (major_gte_1_5 && is_enum)) {
4956       is_illegal = true;
4957     }
4958   } else { // not interface
4959     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4960       is_illegal = true;
4961     } else {
4962       if (is_value_class && !is_abstract && !is_static && !is_final) {
4963         is_illegal = true;
4964       } else if (is_abstract && !is_identity_class && !is_static) {
4965         is_illegal = true;
4966       }
4967     }
4968   }
4969 
4970   if (is_illegal) {
4971     ResourceMark rm(THREAD);
4972     Exceptions::fthrow(
4973       THREAD_AND_LOCATION,
4974       vmSymbols::java_lang_ClassFormatError(),
4975       "Illegal field modifiers in class %s: 0x%X",
4976       _class_name->as_C_string(), flags);
4977     return;
4978   }
4979 }
4980 
4981 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4982                                                     AccessFlags class_access_flags,
4983                                                     const Symbol* name,
4984                                                     TRAPS) const {
4985   if (!_need_verify) { return; }
4986 
4987   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4988   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4989   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4990   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4991   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4992   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4993   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4994   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4995   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4996   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4997   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
4998   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4999   const bool major_gte_17    = _major_version >= JAVA_17_VERSION;
5000   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
5001   const bool is_factory      = (name == vmSymbols::inline_factory_name() && supports_inline_types());
5002   const bool is_interface    = class_access_flags.is_interface();
5003   const bool is_value_class  = class_access_flags.is_value_class();
5004   const bool is_identity_class = class_access_flags.is_identity_class();
5005   const bool is_abstract_class = class_access_flags.is_abstract();
5006 
5007   bool is_illegal = false;
5008 
5009   const char* class_note = "";
5010   if (is_interface) {
5011     if (major_gte_8) {
5012       // Class file version is JAVA_8_VERSION or later Methods of
5013       // interfaces may set any of the flags except ACC_PROTECTED,
5014       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5015       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5016       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5017           (is_native || is_protected || is_final || is_synchronized) ||
5018           // If a specific method of a class or interface has its
5019           // ACC_ABSTRACT flag set, it must not have any of its
5020           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5021           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
5022           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5023           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5024           (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
5025         is_illegal = true;
5026       }
5027     } else if (major_gte_1_5) {
5028       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5029       if (!is_public || is_private || is_protected || is_static || is_final ||
5030           is_synchronized || is_native || !is_abstract || is_strict) {
5031         is_illegal = true;
5032       }
5033     } else {
5034       // Class file version is pre-JAVA_1_5_VERSION
5035       if (!is_public || is_static || is_final || is_native || !is_abstract) {
5036         is_illegal = true;
5037       }
5038     }
5039   } else { // not interface
5040     if (has_illegal_visibility(flags)) {
5041       is_illegal = true;
5042     } else {
5043       if (is_factory) { // <vnew> factory method
5044         if (is_final || is_synchronized || is_native || !is_static ||
5045             is_abstract || is_bridge) {
5046           is_illegal = true;
5047           class_note = (is_value_class ? " (a value class)" : " (not a value class)");
5048         }
5049       } else if (is_initializer) {
5050         if (is_static || is_final || is_synchronized || is_native ||
5051             is_abstract || (major_gte_1_5 && is_bridge)) {
5052           is_illegal = true;
5053         }
5054       } else { // not initializer
5055         if (!is_identity_class && is_synchronized && !is_static) {
5056           is_illegal = true;
5057           class_note = " (not an identity class)";
5058         } else {
5059           if (is_abstract) {
5060             if ((is_final || is_native || is_private || is_static ||
5061                 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
5062               is_illegal = true;
5063             }
5064           }
5065         }
5066       }
5067     }
5068   }
5069 
5070   if (is_illegal) {
5071     ResourceMark rm(THREAD);
5072     if (is_value_class && is_initializer) {
5073       Exceptions::fthrow(
5074         THREAD_AND_LOCATION,
5075         vmSymbols::java_lang_ClassFormatError(),
5076         "Method <init> is not allowed in value class %s",
5077         _class_name->as_C_string());
5078     } else {
5079       Exceptions::fthrow(
5080         THREAD_AND_LOCATION,
5081         vmSymbols::java_lang_ClassFormatError(),
5082         "Method %s in class %s%s has illegal modifiers: 0x%X",
5083         name->as_C_string(), _class_name->as_C_string(),
5084         class_note, flags);
5085     }
5086     return;
5087   }
5088 }
5089 
5090 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5091                                         int length,
5092                                         TRAPS) const {
5093   assert(_need_verify, "only called when _need_verify is true");
5094   if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5095     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
5096   }
5097 }
5098 
5099 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5100 // In class names, '/' separates unqualified names.  This is verified in this function also.
5101 // Method names also may not contain the characters '<' or '>', unless <init>
5102 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
5103 // method.  Because these names have been checked as special cases before
5104 // calling this method in verify_legal_method_name.
5105 //
5106 // This method is also called from the modular system APIs in modules.cpp
5107 // to verify the validity of module and package names.
5108 bool ClassFileParser::verify_unqualified_name(const char* name,
5109                                               unsigned int length,
5110                                               int type) {
5111   if (length == 0) return false;  // Must have at least one char.
5112   for (const char* p = name; p != name + length; p++) {
5113     switch(*p) {
5114       case JVM_SIGNATURE_DOT:
5115       case JVM_SIGNATURE_ENDCLASS:
5116       case JVM_SIGNATURE_ARRAY:
5117         // do not permit '.', ';', or '['
5118         return false;
5119       case JVM_SIGNATURE_SLASH:
5120         // check for '//' or leading or trailing '/' which are not legal
5121         // unqualified name must not be empty
5122         if (type == ClassFileParser::LegalClass) {
5123           if (p == name || p+1 >= name+length ||
5124               *(p+1) == JVM_SIGNATURE_SLASH) {
5125             return false;
5126           }
5127         } else {
5128           return false;   // do not permit '/' unless it's class name
5129         }
5130         break;
5131       case JVM_SIGNATURE_SPECIAL:
5132       case JVM_SIGNATURE_ENDSPECIAL:
5133         // do not permit '<' or '>' in method names
5134         if (type == ClassFileParser::LegalMethod) {
5135           return false;
5136         }
5137     }
5138   }
5139   return true;
5140 }
5141 
5142 // Take pointer to a UTF8 byte string (not NUL-terminated).
5143 // Skip over the longest part of the string that could
5144 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
5145 // Return a pointer to just past the fieldname.
5146 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5147 // being true, we saw consecutive slashes (meaning we were looking for a
5148 // qualified path but found something that was badly-formed).
5149 static const char* skip_over_field_name(const char* const name,
5150                                         bool slash_ok,
5151                                         unsigned int length) {
5152   const char* p;
5153   jboolean last_is_slash = false;
5154   jboolean not_first_ch = false;
5155 
5156   for (p = name; p != name + length; not_first_ch = true) {
5157     const char* old_p = p;
5158     jchar ch = *p;
5159     if (ch < 128) {
5160       p++;
5161       // quick check for ascii
5162       if ((ch >= 'a' && ch <= 'z') ||
5163         (ch >= 'A' && ch <= 'Z') ||
5164         (ch == '_' || ch == '$') ||
5165         (not_first_ch && ch >= '0' && ch <= '9')) {
5166         last_is_slash = false;
5167         continue;
5168       }
5169       if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5170         if (last_is_slash) {
5171           return NULL;  // Don't permit consecutive slashes
5172         }
5173         last_is_slash = true;
5174         continue;
5175       }
5176     }
5177     else {
5178       jint unicode_ch;
5179       char* tmp_p = UTF8::next_character(p, &unicode_ch);
5180       p = tmp_p;
5181       last_is_slash = false;
5182       // Check if ch is Java identifier start or is Java identifier part
5183       // 4672820: call java.lang.Character methods directly without generating separate tables.
5184       EXCEPTION_MARK;
5185       // return value
5186       JavaValue result(T_BOOLEAN);
5187       // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5188       JavaCallArguments args;
5189       args.push_int(unicode_ch);
5190 
5191       if (not_first_ch) {
5192         // public static boolean isJavaIdentifierPart(char ch);
5193         JavaCalls::call_static(&result,
5194           vmClasses::Character_klass(),
5195           vmSymbols::isJavaIdentifierPart_name(),
5196           vmSymbols::int_bool_signature(),
5197           &args,
5198           THREAD);
5199       } else {
5200         // public static boolean isJavaIdentifierStart(char ch);
5201         JavaCalls::call_static(&result,
5202           vmClasses::Character_klass(),
5203           vmSymbols::isJavaIdentifierStart_name(),
5204           vmSymbols::int_bool_signature(),
5205           &args,
5206           THREAD);
5207       }
5208       if (HAS_PENDING_EXCEPTION) {
5209         CLEAR_PENDING_EXCEPTION;
5210         return NULL;
5211       }
5212       if(result.get_jboolean()) {
5213         continue;
5214       }
5215     }
5216     return (not_first_ch) ? old_p : NULL;
5217   }
5218   return (not_first_ch && !last_is_slash) ? p : NULL;
5219 }
5220 
5221 // Take pointer to a UTF8 byte string (not NUL-terminated).
5222 // Skip over the longest part of the string that could
5223 // be taken as a field signature. Allow "void" if void_ok.
5224 // Return a pointer to just past the signature.
5225 // Return NULL if no legal signature is found.
5226 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5227                                                        bool void_ok,
5228                                                        unsigned int length,
5229                                                        TRAPS) const {
5230   unsigned int array_dim = 0;
5231   while (length > 0) {
5232     switch (signature[0]) {
5233     case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5234     case JVM_SIGNATURE_BOOLEAN:
5235     case JVM_SIGNATURE_BYTE:
5236     case JVM_SIGNATURE_CHAR:
5237     case JVM_SIGNATURE_SHORT:
5238     case JVM_SIGNATURE_INT:
5239     case JVM_SIGNATURE_FLOAT:
5240     case JVM_SIGNATURE_LONG:
5241     case JVM_SIGNATURE_DOUBLE:
5242       return signature + 1;
5243     case JVM_SIGNATURE_PRIMITIVE_OBJECT:
5244       // Can't enable this check fully until JDK upgrades the bytecode generators (TODO: JDK-8270852).
5245       // For now, compare to class file version 51 so old verifier doesn't see Q signatures.
5246       if ( (_major_version < 51 /* CONSTANT_CLASS_DESCRIPTORS */ ) || (!EnablePrimitiveClasses)) {
5247         classfile_parse_error("Class name contains illegal Q-signature "
5248                               "in descriptor in class file %s, requires option -XX:+EnablePrimitiveClasses",
5249                               CHECK_0);
5250         return NULL;
5251       }
5252       // fall through
5253     case JVM_SIGNATURE_CLASS:
5254     {
5255       if (_major_version < JAVA_1_5_VERSION) {
5256         // Skip over the class name if one is there
5257         const char* const p = skip_over_field_name(signature + 1, true, --length);
5258 
5259         // The next character better be a semicolon
5260         if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5261           return p + 1;
5262         }
5263       }
5264       else {
5265         // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5266         signature++;
5267         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5268         // Format check signature
5269         if (c != NULL) {
5270           int newlen = c - (char*) signature;
5271           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5272           if (!legal) {
5273             classfile_parse_error("Class name is empty or contains illegal character "
5274                                   "in descriptor in class file %s",
5275                                   THREAD);
5276             return NULL;
5277           }
5278           return signature + newlen + 1;
5279         }
5280       }
5281       return NULL;
5282     }
5283     case JVM_SIGNATURE_ARRAY:
5284       array_dim++;
5285       if (array_dim > 255) {
5286         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5287         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
5288         return NULL;
5289       }
5290       // The rest of what's there better be a legal signature
5291       signature++;
5292       length--;
5293       void_ok = false;
5294       break;
5295     default:
5296       return NULL;
5297     }
5298   }
5299   return NULL;
5300 }
5301 
5302 // Checks if name is a legal class name.
5303 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5304   if (!_need_verify || _relax_verify) { return; }
5305 
5306   assert(name->refcount() > 0, "symbol must be kept alive");
5307   char* bytes = (char*)name->bytes();
5308   unsigned int length = name->utf8_length();
5309   bool legal = false;
5310 
5311   if (length > 0) {
5312     const char* p;
5313     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5314       p = skip_over_field_signature(bytes, false, length, CHECK);
5315       legal = (p != NULL) && ((p - bytes) == (int)length);
5316     } else if (_major_version < JAVA_1_5_VERSION) {
5317       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5318         p = skip_over_field_name(bytes, true, length);
5319         legal = (p != NULL) && ((p - bytes) == (int)length);
5320       }
5321     } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
5322                    && bytes[length - 1] == ';' ) {
5323       // Support for L...; and Q...; descriptors
5324       legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5325     } else {
5326       // 4900761: relax the constraints based on JSR202 spec
5327       // Class names may be drawn from the entire Unicode character set.
5328       // Identifiers between '/' must be unqualified names.
5329       // The utf8 string has been verified when parsing cpool entries.
5330       legal = verify_unqualified_name(bytes, length, LegalClass);
5331     }
5332   }
5333   if (!legal) {
5334     ResourceMark rm(THREAD);
5335     assert(_class_name != NULL, "invariant");
5336     Exceptions::fthrow(
5337       THREAD_AND_LOCATION,
5338       vmSymbols::java_lang_ClassFormatError(),
5339       "Illegal class name \"%.*s\" in class file %s", length, bytes,
5340       _class_name->as_C_string()
5341     );
5342     return;
5343   }
5344 }
5345 
5346 // Checks if name is a legal field name.
5347 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5348   if (!_need_verify || _relax_verify) { return; }
5349 
5350   char* bytes = (char*)name->bytes();
5351   unsigned int length = name->utf8_length();
5352   bool legal = false;
5353 
5354   if (length > 0) {
5355     if (_major_version < JAVA_1_5_VERSION) {
5356       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5357         const char* p = skip_over_field_name(bytes, false, length);
5358         legal = (p != NULL) && ((p - bytes) == (int)length);
5359       }
5360     } else {
5361       // 4881221: relax the constraints based on JSR202 spec
5362       legal = verify_unqualified_name(bytes, length, LegalField);
5363     }
5364   }
5365 
5366   if (!legal) {
5367     ResourceMark rm(THREAD);
5368     assert(_class_name != NULL, "invariant");
5369     Exceptions::fthrow(
5370       THREAD_AND_LOCATION,
5371       vmSymbols::java_lang_ClassFormatError(),
5372       "Illegal field name \"%.*s\" in class %s", length, bytes,
5373       _class_name->as_C_string()
5374     );
5375     return;
5376   }
5377 }
5378 
5379 // Checks if name is a legal method name.
5380 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5381   if (!_need_verify || _relax_verify) { return; }
5382 
5383   assert(name != NULL, "method name is null");
5384   char* bytes = (char*)name->bytes();
5385   unsigned int length = name->utf8_length();
5386   bool legal = false;
5387 
5388   if (length > 0) {
5389     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5390       if (name == vmSymbols::object_initializer_name() ||
5391           name == vmSymbols::class_initializer_name()  ||
5392           (EnableValhalla && supports_inline_types() &&
5393           name == vmSymbols::inline_factory_name())) {
5394         legal = true;
5395       }
5396     } else if (_major_version < JAVA_1_5_VERSION) {
5397       const char* p;
5398       p = skip_over_field_name(bytes, false, length);
5399       legal = (p != NULL) && ((p - bytes) == (int)length);
5400     } else {
5401       // 4881221: relax the constraints based on JSR202 spec
5402       legal = verify_unqualified_name(bytes, length, LegalMethod);
5403     }
5404   }
5405 
5406   if (!legal) {
5407     ResourceMark rm(THREAD);
5408     assert(_class_name != NULL, "invariant");
5409     Exceptions::fthrow(
5410       THREAD_AND_LOCATION,
5411       vmSymbols::java_lang_ClassFormatError(),
5412       "Illegal method name \"%.*s\" in class %s", length, bytes,
5413       _class_name->as_C_string()
5414     );
5415     return;
5416   }
5417 }
5418 
5419 
5420 // Checks if signature is a legal field signature.
5421 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5422                                                    const Symbol* signature,
5423                                                    TRAPS) const {
5424   if (!_need_verify) { return; }
5425   if ((!supports_inline_types() || !EnablePrimitiveClasses) && (signature->is_Q_signature() || signature->is_Q_array_signature())) {
5426     throwIllegalSignature("Field", name, signature, CHECK);
5427   }
5428 
5429   const char* const bytes = (const char* const)signature->bytes();
5430   const unsigned int length = signature->utf8_length();
5431   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5432 
5433   if (p == NULL || (p - bytes) != (int)length) {
5434     throwIllegalSignature("Field", name, signature, CHECK);
5435   }
5436 }
5437 
5438 // Check that the signature is compatible with the method name.  For example,
5439 // check that <init> has a void signature.
5440 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5441                                                        const Symbol* signature,
5442                                                        TRAPS) const {
5443   if (!_need_verify) {
5444     return;
5445   }
5446 
5447   // Class initializers cannot have args for class format version >= 51.
5448   if (name == vmSymbols::class_initializer_name() &&
5449       signature != vmSymbols::void_method_signature() &&
5450       _major_version >= JAVA_7_VERSION) {
5451     throwIllegalSignature("Method", name, signature, THREAD);
5452     return;
5453   }
5454 
5455   if (!is_value_class()) {
5456     int sig_length = signature->utf8_length();
5457     if (name->utf8_length() > 0 &&
5458       name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5459       sig_length > 0 &&
5460       signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5461       throwIllegalSignature("Method", name, signature, THREAD);
5462     }
5463   }
5464 }
5465 
5466 // Checks if signature is a legal method signature.
5467 // Returns number of parameters
5468 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5469                                                    const Symbol* signature,
5470                                                    TRAPS) const {
5471   if (!_need_verify) {
5472     // make sure caller's args_size will be less than 0 even for non-static
5473     // method so it will be recomputed in compute_size_of_parameters().
5474     return -2;
5475   }
5476 
5477   unsigned int args_size = 0;
5478   const char* p = (const char*)signature->bytes();
5479   unsigned int length = signature->utf8_length();
5480   const char* nextp;
5481 
5482   // The first character must be a '('
5483   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5484     length--;
5485     // Skip over legal field signatures
5486     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5487     while ((length > 0) && (nextp != NULL)) {
5488       args_size++;
5489       if (p[0] == 'J' || p[0] == 'D') {
5490         args_size++;
5491       }
5492       length -= nextp - p;
5493       p = nextp;
5494       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5495     }
5496     // The first non-signature thing better be a ')'
5497     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5498       length--;
5499       // Now we better just have a return value
5500       nextp = skip_over_field_signature(p, true, length, CHECK_0);
5501       if (nextp && ((int)length == (nextp - p))) {
5502         return args_size;
5503       }
5504     }
5505   }
5506   // Report error
5507   throwIllegalSignature("Method", name, signature, THREAD);
5508   return 0;
5509 }
5510 
5511 int ClassFileParser::static_field_size() const {
5512   assert(_field_info != NULL, "invariant");
5513   return _field_info->_static_field_size;
5514 }
5515 
5516 int ClassFileParser::total_oop_map_count() const {
5517   assert(_field_info != NULL, "invariant");
5518   return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5519 }
5520 
5521 jint ClassFileParser::layout_size() const {
5522   assert(_field_info != NULL, "invariant");
5523   return _field_info->_instance_size;
5524 }
5525 
5526 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5527                                          const Array<Method*>* methods) {
5528   assert(ik != NULL, "invariant");
5529   assert(methods != NULL, "invariant");
5530 
5531   // Set up Method*::intrinsic_id as soon as we know the names of methods.
5532   // (We used to do this lazily, but now we query it in Rewriter,
5533   // which is eagerly done for every method, so we might as well do it now,
5534   // when everything is fresh in memory.)
5535   const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5536 
5537   if (klass_id != vmSymbolID::NO_SID) {
5538     for (int j = 0; j < methods->length(); ++j) {
5539       Method* method = methods->at(j);
5540       method->init_intrinsic_id(klass_id);
5541 
5542       if (CheckIntrinsics) {
5543         // Check if an intrinsic is defined for method 'method',
5544         // but the method is not annotated with @IntrinsicCandidate.
5545         if (method->intrinsic_id() != vmIntrinsics::_none &&
5546             !method->intrinsic_candidate()) {
5547               tty->print("Compiler intrinsic is defined for method [%s], "
5548               "but the method is not annotated with @IntrinsicCandidate.%s",
5549               method->name_and_sig_as_C_string(),
5550               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5551             );
5552           tty->cr();
5553           DEBUG_ONLY(vm_exit(1));
5554         }
5555         // Check is the method 'method' is annotated with @IntrinsicCandidate,
5556         // but there is no intrinsic available for it.
5557         if (method->intrinsic_candidate() &&
5558           method->intrinsic_id() == vmIntrinsics::_none) {
5559             tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5560               "but no compiler intrinsic is defined for the method.%s",
5561               method->name_and_sig_as_C_string(),
5562               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5563             );
5564           tty->cr();
5565           DEBUG_ONLY(vm_exit(1));
5566         }
5567       }
5568     } // end for
5569 
5570 #ifdef ASSERT
5571     if (CheckIntrinsics) {
5572       // Check for orphan methods in the current class. A method m
5573       // of a class C is orphan if an intrinsic is defined for method m,
5574       // but class C does not declare m.
5575       // The check is potentially expensive, therefore it is available
5576       // only in debug builds.
5577 
5578       for (auto id : EnumRange<vmIntrinsicID>{}) {
5579         if (vmIntrinsics::_compiledLambdaForm == id) {
5580           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5581           // generated for the JVM from a LambdaForm and therefore no method
5582           // is defined for it.
5583           continue;
5584         }
5585         if (vmIntrinsics::_blackhole == id) {
5586           // The _blackhole intrinsic is a special marker. No explicit method
5587           // is defined for it.
5588           continue;
5589         }
5590 
5591         if (vmIntrinsics::class_for(id) == klass_id) {
5592           // Check if the current class contains a method with the same
5593           // name, flags, signature.
5594           bool match = false;
5595           for (int j = 0; j < methods->length(); ++j) {
5596             const Method* method = methods->at(j);
5597             if (method->intrinsic_id() == id) {
5598               match = true;
5599               break;
5600             }
5601           }
5602 
5603           if (!match) {
5604             char buf[1000];
5605             tty->print("Compiler intrinsic is defined for method [%s], "
5606                        "but the method is not available in class [%s].%s",
5607                         vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5608                         ik->name()->as_C_string(),
5609                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5610             );
5611             tty->cr();
5612             DEBUG_ONLY(vm_exit(1));
5613           }
5614         }
5615       } // end for
5616     } // CheckIntrinsics
5617 #endif // ASSERT
5618   }
5619 }
5620 
5621 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5622                                                       const ClassInstanceInfo& cl_inst_info,
5623                                                       TRAPS) {
5624   if (_klass != NULL) {
5625     return _klass;
5626   }
5627 
5628   InstanceKlass* const ik =
5629     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5630 
5631   if (is_hidden()) {
5632     mangle_hidden_class_name(ik);
5633   }
5634 
5635   fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5636 
5637   assert(_klass == ik, "invariant");
5638   return ik;
5639 }
5640 
5641 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5642                                           bool changed_by_loadhook,
5643                                           const ClassInstanceInfo& cl_inst_info,
5644                                           TRAPS) {
5645   assert(ik != NULL, "invariant");
5646 
5647   // Set name and CLD before adding to CLD
5648   ik->set_class_loader_data(_loader_data);
5649   ik->set_name(_class_name);
5650 
5651   // Add all classes to our internal class loader list here,
5652   // including classes in the bootstrap (NULL) class loader.
5653   const bool publicize = !is_internal();
5654 
5655   _loader_data->add_class(ik, publicize);
5656 
5657   set_klass_to_deallocate(ik);
5658 
5659   assert(_field_info != NULL, "invariant");
5660   assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5661   assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5662          "sanity");
5663 
5664   assert(ik->is_instance_klass(), "sanity");
5665   assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5666 
5667   // Fill in information already parsed
5668   ik->set_should_verify_class(_need_verify);
5669 
5670   // Not yet: supers are done below to support the new subtype-checking fields
5671   ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5672   ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5673   if (_field_info->_is_naturally_atomic && ik->is_inline_klass()) {
5674     ik->set_is_naturally_atomic();
5675   }
5676 
5677   if (carries_identity_modifier()) {
5678     ik->set_carries_identity_modifier();
5679   } else if (carries_value_modifier()) {
5680     ik->set_carries_value_modifier();
5681   }
5682 
5683   assert(_fac != NULL, "invariant");
5684   ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_INLINE]);
5685 
5686   // this transfers ownership of a lot of arrays from
5687   // the parser onto the InstanceKlass*
5688   apply_parsed_class_metadata(ik, _java_fields_count);
5689 
5690   // can only set dynamic nest-host after static nest information is set
5691   if (cl_inst_info.dynamic_nest_host() != NULL) {
5692     ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5693   }
5694 
5695   // note that is not safe to use the fields in the parser from this point on
5696   assert(NULL == _cp, "invariant");
5697   assert(NULL == _fields, "invariant");
5698   assert(NULL == _methods, "invariant");
5699   assert(NULL == _inner_classes, "invariant");
5700   assert(NULL == _nest_members, "invariant");
5701   assert(NULL == _preload_classes, "invariant");
5702   assert(NULL == _combined_annotations, "invariant");
5703   assert(NULL == _record_components, "invariant");
5704   assert(NULL == _permitted_subclasses, "invariant");
5705 
5706   if (_has_localvariable_table) {
5707     ik->set_has_localvariable_table(true);
5708   }
5709 
5710   if (_has_final_method) {
5711     ik->set_has_final_method();
5712   }
5713 
5714   ik->copy_method_ordering(_method_ordering, CHECK);
5715   // The InstanceKlass::_methods_jmethod_ids cache
5716   // is managed on the assumption that the initial cache
5717   // size is equal to the number of methods in the class. If
5718   // that changes, then InstanceKlass::idnum_can_increment()
5719   // has to be changed accordingly.
5720   ik->set_initial_method_idnum(ik->methods()->length());
5721 
5722   ik->set_this_class_index(_this_class_index);
5723 
5724   if (_is_hidden) {
5725     // _this_class_index is a CONSTANT_Class entry that refers to this
5726     // hidden class itself. If this class needs to refer to its own methods
5727     // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5728     // _this_class_index. However, because this class is hidden (it's
5729     // not stored in SystemDictionary), _this_class_index cannot be resolved
5730     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5731     // Therefore, we must eagerly resolve _this_class_index now.
5732     ik->constants()->klass_at_put(_this_class_index, ik);
5733   }
5734 
5735   ik->set_minor_version(_minor_version);
5736   ik->set_major_version(_major_version);
5737   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5738   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5739   if (_is_declared_atomic) {
5740     ik->set_is_declared_atomic();
5741   }
5742 
5743   if (_is_hidden) {
5744     ik->set_is_hidden();
5745   }
5746 
5747   // Set PackageEntry for this_klass
5748   oop cl = ik->class_loader();
5749   Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5750   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5751   ik->set_package(cld, NULL, CHECK);
5752 
5753   const Array<Method*>* const methods = ik->methods();
5754   assert(methods != NULL, "invariant");
5755   const int methods_len = methods->length();
5756 
5757   check_methods_for_intrinsics(ik, methods);
5758 
5759   // Fill in field values obtained by parse_classfile_attributes
5760   if (_parsed_annotations->has_any_annotations()) {
5761     _parsed_annotations->apply_to(ik);
5762   }
5763 
5764   apply_parsed_class_attributes(ik);
5765 
5766   // Miranda methods
5767   if ((_num_miranda_methods > 0) ||
5768       // if this class introduced new miranda methods or
5769       (_super_klass != NULL && _super_klass->has_miranda_methods())
5770         // super class exists and this class inherited miranda methods
5771      ) {
5772        ik->set_has_miranda_methods(); // then set a flag
5773   }
5774 
5775   // Fill in information needed to compute superclasses.
5776   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5777   ik->set_transitive_interfaces(_transitive_interfaces);
5778   ik->set_local_interfaces(_local_interfaces);
5779   _transitive_interfaces = NULL;
5780   _local_interfaces = NULL;
5781 
5782   // Initialize itable offset tables
5783   klassItable::setup_itable_offset_table(ik);
5784 
5785   // Compute transitive closure of interfaces this class implements
5786   // Do final class setup
5787   OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5788   if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5789     oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5790   }
5791 
5792   if (_has_contended_fields || _parsed_annotations->is_contended() ||
5793       ( _super_klass != NULL && _super_klass->has_contended_annotations())) {
5794     ik->set_has_contended_annotations(true);
5795   }
5796 
5797   // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5798   set_precomputed_flags(ik);
5799 
5800   // check if this class can access its super class
5801   check_super_class_access(ik, CHECK);
5802 
5803   // check if this class can access its superinterfaces
5804   check_super_interface_access(ik, CHECK);
5805 
5806   // check if this class overrides any final method
5807   check_final_method_override(ik, CHECK);
5808 
5809   // reject static interface methods prior to Java 8
5810   if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5811     check_illegal_static_method(ik, CHECK);
5812   }
5813 
5814   // Obtain this_klass' module entry
5815   ModuleEntry* module_entry = ik->module();
5816   assert(module_entry != NULL, "module_entry should always be set");
5817 
5818   // Obtain java.lang.Module
5819   Handle module_handle(THREAD, module_entry->module());
5820 
5821   // Allocate mirror and initialize static fields
5822   // The create_mirror() call will also call compute_modifiers()
5823   java_lang_Class::create_mirror(ik,
5824                                  Handle(THREAD, _loader_data->class_loader()),
5825                                  module_handle,
5826                                  _protection_domain,
5827                                  cl_inst_info.class_data(),
5828                                  CHECK);
5829 
5830   assert(_all_mirandas != NULL, "invariant");
5831 
5832   // Generate any default methods - default methods are public interface methods
5833   // that have a default implementation.  This is new with Java 8.
5834   if (_has_nonstatic_concrete_methods) {
5835     DefaultMethods::generate_default_methods(ik,
5836                                              _all_mirandas,
5837                                              CHECK);
5838   }
5839 
5840   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5841   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5842       !module_entry->has_default_read_edges()) {
5843     if (!module_entry->set_has_default_read_edges()) {
5844       // We won a potential race
5845       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5846     }
5847   }
5848 
5849   bool all_fields_empty = true;
5850   for (AllFieldStream fs(ik->fields(), ik->constants()); !fs.done(); fs.next()) {
5851     if (!fs.access_flags().is_static()) {
5852       if (fs.field_descriptor().is_inline_type()) {
5853         Klass* k = _inline_type_field_klasses->at(fs.index());
5854         ik->set_inline_type_field_klass(fs.index(), k);
5855         if (!InlineKlass::cast(k)->is_empty_inline_type()) { all_fields_empty = false; }
5856       } else {
5857         all_fields_empty = false;
5858       }
5859     } else if (is_inline_type() && (fs.name() == vmSymbols::default_value_name())) {
5860       InlineKlass::cast(ik)->set_default_value_offset(ik->field_offset(fs.index()));
5861     }
5862   }
5863 
5864   if (_is_empty_inline_type || (is_inline_type() && all_fields_empty)) {
5865     ik->set_is_empty_inline_type();
5866   }
5867 
5868   if (is_inline_type()) {
5869     InlineKlass* vk = InlineKlass::cast(ik);
5870     vk->set_alignment(_alignment);
5871     vk->set_first_field_offset(_first_field_offset);
5872     vk->set_exact_size_in_bytes(_exact_size_in_bytes);
5873     InlineKlass::cast(ik)->initialize_calling_convention(CHECK);
5874   }
5875 
5876   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5877 
5878   if (!is_internal()) {
5879     ik->print_class_load_logging(_loader_data, module_entry, _stream);
5880 
5881     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5882         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5883         log_is_enabled(Info, class, preview)) {
5884       ResourceMark rm;
5885       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5886                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5887     }
5888 
5889     if (log_is_enabled(Debug, class, resolve))  {
5890       ResourceMark rm;
5891       // print out the superclass.
5892       const char * from = ik->external_name();
5893       if (ik->java_super() != NULL) {
5894         log_debug(class, resolve)("%s %s (super)",
5895                    from,
5896                    ik->java_super()->external_name());
5897       }
5898       // print out each of the interface classes referred to by this class.
5899       const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5900       if (local_interfaces != NULL) {
5901         const int length = local_interfaces->length();
5902         for (int i = 0; i < length; i++) {
5903           const InstanceKlass* const k = local_interfaces->at(i);
5904           const char * to = k->external_name();
5905           log_debug(class, resolve)("%s %s (interface)", from, to);
5906         }
5907       }
5908     }
5909   }
5910 
5911   JFR_ONLY(INIT_ID(ik);)
5912 
5913   // If we reach here, all is well.
5914   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5915   // in order for it to not be destroyed in the ClassFileParser destructor.
5916   set_klass_to_deallocate(NULL);
5917 
5918   // it's official
5919   set_klass(ik);
5920 
5921   debug_only(ik->verify();)
5922 }
5923 
5924 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5925   // Decrement the refcount in the old name, since we're clobbering it.
5926   _class_name->decrement_refcount();
5927 
5928   _class_name = new_class_name;
5929   // Increment the refcount of the new name.
5930   // Now the ClassFileParser owns this name and will decrement in
5931   // the destructor.
5932   _class_name->increment_refcount();
5933 }
5934 
5935 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5936   bool trusted = loader_data->is_boot_class_loader_data() ||
5937                  loader_data->is_platform_class_loader_data();
5938   bool need_verify =
5939     // verifyAll
5940     (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5941     // verifyRemote
5942     (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5943   return !need_verify;
5944 }
5945 
5946 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5947                                  Symbol* name,
5948                                  ClassLoaderData* loader_data,
5949                                  const ClassLoadInfo* cl_info,
5950                                  Publicity pub_level,
5951                                  TRAPS) :
5952   _stream(stream),
5953   _class_name(NULL),
5954   _loader_data(loader_data),
5955   _is_hidden(cl_info->is_hidden()),
5956   _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5957   _orig_cp_size(0),
5958   _super_klass(),
5959   _cp(NULL),
5960   _fields(NULL),
5961   _methods(NULL),
5962   _inner_classes(NULL),
5963   _nest_members(NULL),
5964   _nest_host(0),
5965   _permitted_subclasses(NULL),
5966   _preload_classes(NULL),
5967   _record_components(NULL),
5968   _local_interfaces(NULL),
5969   _local_interface_indexes(NULL),
5970   _transitive_interfaces(NULL),
5971   _combined_annotations(NULL),
5972   _class_annotations(NULL),
5973   _class_type_annotations(NULL),
5974   _fields_annotations(NULL),
5975   _fields_type_annotations(NULL),
5976   _klass(NULL),
5977   _klass_to_deallocate(NULL),
5978   _parsed_annotations(NULL),
5979   _fac(NULL),
5980   _field_info(NULL),
5981   _inline_type_field_klasses(NULL),
5982   _method_ordering(NULL),
5983   _all_mirandas(NULL),
5984   _vtable_size(0),
5985   _itable_size(0),
5986   _num_miranda_methods(0),
5987   _protection_domain(cl_info->protection_domain()),
5988   _access_flags(),
5989   _pub_level(pub_level),
5990   _bad_constant_seen(0),
5991   _synthetic_flag(false),
5992   _sde_length(false),
5993   _sde_buffer(NULL),
5994   _sourcefile_index(0),
5995   _generic_signature_index(0),
5996   _major_version(0),
5997   _minor_version(0),
5998   _this_class_index(0),
5999   _super_class_index(0),
6000   _itfs_len(0),
6001   _java_fields_count(0),
6002   _need_verify(false),
6003   _relax_verify(false),
6004   _has_nonstatic_concrete_methods(false),
6005   _declares_nonstatic_concrete_methods(false),
6006   _has_localvariable_table(false),
6007   _has_final_method(false),
6008   _has_contended_fields(false),
6009   _has_inline_type_fields(false),
6010   _has_nonstatic_fields(false),
6011   _is_empty_inline_type(false),
6012   _is_naturally_atomic(false),
6013   _is_declared_atomic(false),
6014   _carries_value_modifier(false),
6015   _carries_identity_modifier(false),
6016   _has_finalizer(false),
6017   _has_empty_finalizer(false),
6018   _has_vanilla_constructor(false),
6019   _max_bootstrap_specifier_index(-1) {
6020 
6021   _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6022   _class_name->increment_refcount();
6023 
6024   assert(_loader_data != NULL, "invariant");
6025   assert(stream != NULL, "invariant");
6026   assert(_stream != NULL, "invariant");
6027   assert(_stream->buffer() == _stream->current(), "invariant");
6028   assert(_class_name != NULL, "invariant");
6029   assert(0 == _access_flags.as_int(), "invariant");
6030 
6031   // Figure out whether we can skip format checking (matching classic VM behavior)
6032   if (DumpSharedSpaces) {
6033     // verify == true means it's a 'remote' class (i.e., non-boot class)
6034     // Verification decision is based on BytecodeVerificationRemote flag
6035     // for those classes.
6036     _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6037                                               BytecodeVerificationLocal;
6038   }
6039   else {
6040     _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6041                                                stream->need_verify());
6042   }
6043 
6044   // synch back verification state to stream
6045   stream->set_verify(_need_verify);
6046 
6047   // Check if verification needs to be relaxed for this class file
6048   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6049   _relax_verify = relax_format_check_for(_loader_data);
6050 
6051   parse_stream(stream, CHECK);
6052 
6053   post_process_parsed_stream(stream, _cp, CHECK);
6054 }
6055 
6056 void ClassFileParser::clear_class_metadata() {
6057   // metadata created before the instance klass is created.  Must be
6058   // deallocated if classfile parsing returns an error.
6059   _cp = NULL;
6060   _fields = NULL;
6061   _methods = NULL;
6062   _inner_classes = NULL;
6063   _nest_members = NULL;
6064   _permitted_subclasses = NULL;
6065   _preload_classes = NULL;
6066   _combined_annotations = NULL;
6067   _class_annotations = _class_type_annotations = NULL;
6068   _fields_annotations = _fields_type_annotations = NULL;
6069   _record_components = NULL;
6070 }
6071 
6072 // Destructor to clean up
6073 ClassFileParser::~ClassFileParser() {
6074   _class_name->decrement_refcount();
6075 
6076   if (_cp != NULL) {
6077     MetadataFactory::free_metadata(_loader_data, _cp);
6078   }
6079   if (_fields != NULL) {
6080     MetadataFactory::free_array<u2>(_loader_data, _fields);
6081   }
6082 
6083   if (_inline_type_field_klasses != NULL) {
6084      MetadataFactory::free_array<InlineKlass*>(_loader_data, _inline_type_field_klasses);
6085   }
6086 
6087   if (_methods != NULL) {
6088     // Free methods
6089     InstanceKlass::deallocate_methods(_loader_data, _methods);
6090   }
6091 
6092   // beware of the Universe::empty_blah_array!!
6093   if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6094     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6095   }
6096 
6097   if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6098     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6099   }
6100 
6101   if (_record_components != NULL) {
6102     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6103   }
6104 
6105   if (_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array()) {
6106     MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
6107   }
6108 
6109   if (_preload_classes != NULL && _preload_classes != Universe::the_empty_short_array()) {
6110     MetadataFactory::free_array<u2>(_loader_data, _preload_classes);
6111   }
6112 
6113   // Free interfaces
6114   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6115                                        _local_interfaces, _transitive_interfaces);
6116 
6117   if (_combined_annotations != NULL) {
6118     // After all annotations arrays have been created, they are installed into the
6119     // Annotations object that will be assigned to the InstanceKlass being created.
6120 
6121     // Deallocate the Annotations object and the installed annotations arrays.
6122     _combined_annotations->deallocate_contents(_loader_data);
6123 
6124     // If the _combined_annotations pointer is non-NULL,
6125     // then the other annotations fields should have been cleared.
6126     assert(_class_annotations       == NULL, "Should have been cleared");
6127     assert(_class_type_annotations  == NULL, "Should have been cleared");
6128     assert(_fields_annotations      == NULL, "Should have been cleared");
6129     assert(_fields_type_annotations == NULL, "Should have been cleared");
6130   } else {
6131     // If the annotations arrays were not installed into the Annotations object,
6132     // then they have to be deallocated explicitly.
6133     MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6134     MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6135     Annotations::free_contents(_loader_data, _fields_annotations);
6136     Annotations::free_contents(_loader_data, _fields_type_annotations);
6137   }
6138 
6139   clear_class_metadata();
6140   _transitive_interfaces = NULL;
6141   _local_interfaces = NULL;
6142 
6143   // deallocate the klass if already created.  Don't directly deallocate, but add
6144   // to the deallocate list so that the klass is removed from the CLD::_klasses list
6145   // at a safepoint.
6146   if (_klass_to_deallocate != NULL) {
6147     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6148   }
6149 }
6150 
6151 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6152                                    TRAPS) {
6153 
6154   assert(stream != NULL, "invariant");
6155   assert(_class_name != NULL, "invariant");
6156 
6157   // BEGIN STREAM PARSING
6158   stream->guarantee_more(8, CHECK);  // magic, major, minor
6159   // Magic value
6160   const u4 magic = stream->get_u4_fast();
6161   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6162                      "Incompatible magic value %u in class file %s",
6163                      magic, CHECK);
6164 
6165   // Version numbers
6166   _minor_version = stream->get_u2_fast();
6167   _major_version = stream->get_u2_fast();
6168 
6169   // Check version numbers - we check this even with verifier off
6170   verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6171 
6172   stream->guarantee_more(3, CHECK); // length, first cp tag
6173   u2 cp_size = stream->get_u2_fast();
6174 
6175   guarantee_property(
6176     cp_size >= 1, "Illegal constant pool size %u in class file %s",
6177     cp_size, CHECK);
6178 
6179   _orig_cp_size = cp_size;
6180   if (is_hidden()) { // Add a slot for hidden class name.
6181     cp_size++;
6182   }
6183 
6184   _cp = ConstantPool::allocate(_loader_data,
6185                                cp_size,
6186                                CHECK);
6187 
6188   ConstantPool* const cp = _cp;
6189 
6190   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6191 
6192   assert(cp_size == (const u2)cp->length(), "invariant");
6193 
6194   // ACCESS FLAGS
6195   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
6196 
6197   jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6198   // JVM_ACC_MODULE is defined in JDK-9 and later.
6199   if (_major_version >= JAVA_9_VERSION) {
6200     recognized_modifiers |= JVM_ACC_MODULE;
6201   }
6202   // JVM_ACC_VALUE and JVM_ACC_PRIMITIVE supported version
6203   if (supports_inline_types()) {
6204     recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE;
6205   }
6206 
6207   // Access flags
6208   jint flags = stream->get_u2_fast() & recognized_modifiers;
6209 
6210   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6211     // Set abstract bit for old class files for backward compatibility
6212     flags |= JVM_ACC_ABSTRACT;
6213   }
6214 
6215   // This class and superclass
6216   _this_class_index = stream->get_u2_fast();
6217   check_property(
6218     valid_cp_range(_this_class_index, cp_size) &&
6219       cp->tag_at(_this_class_index).is_unresolved_klass(),
6220     "Invalid this class index %u in constant pool in class file %s",
6221     _this_class_index, CHECK);
6222 
6223   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6224   assert(class_name_in_cp != NULL, "class_name can't be null");
6225 
6226   bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
6227 
6228   verify_legal_class_modifiers(flags, NULL, is_java_lang_Object, CHECK);
6229 
6230   if (EnableValhalla) {
6231     if(!supports_inline_types()) {
6232       const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6233       const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6234       if (!is_module && !is_interface && !is_java_lang_Object) {
6235         flags |= JVM_ACC_IDENTITY;
6236       }
6237     }
6238   }
6239 
6240   _access_flags.set_flags(flags);
6241 
6242   if (EnableValhalla) {
6243     if (_access_flags.is_identity_class()) set_carries_identity_modifier();
6244     if (_access_flags.is_value_class()) set_carries_value_modifier();
6245     if (carries_identity_modifier() && carries_value_modifier()) {
6246       classfile_parse_error("Class %s has both ACC_IDENTITY and ACC_VALUE modifiers", THREAD);
6247     }
6248   }
6249 
6250   short bad_constant = class_bad_constant_seen();
6251   if (bad_constant != 0) {
6252     // Do not throw CFE until after the access_flags are checked because if
6253     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6254     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6255     return;
6256   }
6257 
6258   // Don't need to check whether this class name is legal or not.
6259   // It has been checked when constant pool is parsed.
6260   // However, make sure it is not an array type.
6261   if (_need_verify) {
6262     guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6263                        "Bad class name in class file %s",
6264                        CHECK);
6265   }
6266 
6267 #ifdef ASSERT
6268   // Basic sanity checks
6269   if (_is_hidden) {
6270     assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6271   }
6272 #endif
6273 
6274   // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
6275 
6276   if (_is_hidden) {
6277     assert(_class_name != NULL, "Unexpected null _class_name");
6278 #ifdef ASSERT
6279     if (_need_verify) {
6280       verify_legal_class_name(_class_name, CHECK);
6281     }
6282 #endif
6283 
6284   } else {
6285     // Check if name in class file matches given name
6286     if (_class_name != class_name_in_cp) {
6287       if (_class_name != vmSymbols::unknown_class_name()) {
6288         ResourceMark rm(THREAD);
6289         Exceptions::fthrow(THREAD_AND_LOCATION,
6290                            vmSymbols::java_lang_NoClassDefFoundError(),
6291                            "%s (wrong name: %s)",
6292                            _class_name->as_C_string(),
6293                            class_name_in_cp->as_C_string()
6294                            );
6295         return;
6296       } else {
6297         // The class name was not known by the caller so we set it from
6298         // the value in the CP.
6299         update_class_name(class_name_in_cp);
6300       }
6301       // else nothing to do: the expected class name matches what is in the CP
6302     }
6303   }
6304 
6305   // Verification prevents us from creating names with dots in them, this
6306   // asserts that that's the case.
6307   assert(is_internal_format(_class_name), "external class name format used internally");
6308 
6309   if (!is_internal()) {
6310     LogTarget(Debug, class, preorder) lt;
6311     if (lt.is_enabled()){
6312       ResourceMark rm(THREAD);
6313       LogStream ls(lt);
6314       ls.print("%s", _class_name->as_klass_external_name());
6315       if (stream->source() != NULL) {
6316         ls.print(" source: %s", stream->source());
6317       }
6318       ls.cr();
6319     }
6320   }
6321 
6322   // SUPERKLASS
6323   _super_class_index = stream->get_u2_fast();
6324   _super_klass = parse_super_class(cp,
6325                                    _super_class_index,
6326                                    _need_verify,
6327                                    CHECK);
6328 
6329   // Interfaces
6330   _itfs_len = stream->get_u2_fast();
6331   parse_interfaces(stream,
6332                    _itfs_len,
6333                    cp,
6334                    &_has_nonstatic_concrete_methods,
6335                    &_is_declared_atomic,
6336                    CHECK);
6337 
6338   // Fields (offsets are filled in later)
6339   _fac = new FieldAllocationCount();
6340   parse_fields(stream,
6341                _access_flags,
6342                _fac,
6343                cp,
6344                cp_size,
6345                &_java_fields_count,
6346                CHECK);
6347 
6348   assert(_fields != NULL, "invariant");
6349 
6350   // Methods
6351   parse_methods(stream,
6352                 is_interface(),
6353                 is_value_class(),
6354                 is_abstract_class(),
6355                 &_has_localvariable_table,
6356                 &_has_final_method,
6357                 &_declares_nonstatic_concrete_methods,
6358                 CHECK);
6359 
6360   assert(_methods != NULL, "invariant");
6361 
6362   if (_declares_nonstatic_concrete_methods) {
6363     _has_nonstatic_concrete_methods = true;
6364   }
6365 
6366   // Additional attributes/annotations
6367   _parsed_annotations = new ClassAnnotationCollector();
6368   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6369 
6370   assert(_inner_classes != NULL, "invariant");
6371 
6372   // Finalize the Annotations metadata object,
6373   // now that all annotation arrays have been created.
6374   create_combined_annotations(CHECK);
6375 
6376   // Make sure this is the end of class file stream
6377   guarantee_property(stream->at_eos(),
6378                      "Extra bytes at the end of class file %s",
6379                      CHECK);
6380 
6381   // all bytes in stream read and parsed
6382 }
6383 
6384 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6385   ResourceMark rm;
6386   // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6387   // use a '/' because that confuses finding the class's package.  Also, can't
6388   // use an illegal char such as ';' because that causes serialization issues
6389   // and issues with hidden classes that create their own hidden classes.
6390   char addr_buf[20];
6391   if (DumpSharedSpaces) {
6392     // We want stable names for the archived hidden classes (only for static
6393     // archive for now). Spaces under default_SharedBaseAddress() will be
6394     // occupied by the archive at run time, so we know that no dynamically
6395     // loaded InstanceKlass will be placed under there.
6396     static volatile size_t counter = 0;
6397     Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6398     size_t new_id = Atomic::add(&counter, (size_t)1);
6399     jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
6400   } else {
6401     jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6402   }
6403   size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6404   char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6405   jio_snprintf(new_name, new_name_len, "%s+%s",
6406                _class_name->as_C_string(), addr_buf);
6407   update_class_name(SymbolTable::new_symbol(new_name));
6408 
6409   // Add a Utf8 entry containing the hidden name.
6410   assert(_class_name != NULL, "Unexpected null _class_name");
6411   int hidden_index = _orig_cp_size; // this is an extra slot we added
6412   _cp->symbol_at_put(hidden_index, _class_name);
6413 
6414   // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6415   // We have to update the resolved_klass_index and the name_index together
6416   // so extract the existing resolved_klass_index first.
6417   CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6418   int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6419   _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6420   assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6421          "Bad name_index");
6422 }
6423 
6424 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6425                                                  ConstantPool* cp,
6426                                                  TRAPS) {
6427   assert(stream != NULL, "invariant");
6428   assert(stream->at_eos(), "invariant");
6429   assert(cp != NULL, "invariant");
6430   assert(_loader_data != NULL, "invariant");
6431 
6432   if (_class_name == vmSymbols::java_lang_Object()) {
6433     check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6434         "java.lang.Object cannot implement an interface in class file %s",
6435         CHECK);
6436   }
6437   // We check super class after class file is parsed and format is checked
6438   if (_super_class_index > 0 && NULL == _super_klass) {
6439     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6440     if (is_interface()) {
6441       // Before attempting to resolve the superclass, check for class format
6442       // errors not checked yet.
6443       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6444         "Interfaces must have java.lang.Object as superclass in class file %s",
6445         CHECK);
6446     }
6447     Handle loader(THREAD, _loader_data->class_loader());
6448     if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6449       _super_klass = vmClasses::Object_klass();
6450     } else {
6451       _super_klass = (const InstanceKlass*)
6452                        SystemDictionary::resolve_super_or_fail(_class_name,
6453                                                                super_class_name,
6454                                                                loader,
6455                                                                _protection_domain,
6456                                                                true,
6457                                                                CHECK);
6458     }
6459   }
6460 
6461   if (_super_klass != NULL) {
6462     if (_super_klass->is_interface()) {
6463       classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6464       return;
6465     }
6466 
6467     if (EnableValhalla) {
6468       check_identity_and_value_modifiers(this, _super_klass, CHECK);
6469     }
6470 
6471     if (_super_klass->has_nonstatic_concrete_methods()) {
6472       _has_nonstatic_concrete_methods = true;
6473     }
6474     if (_super_klass->is_declared_atomic()) {
6475       _is_declared_atomic = true;
6476     }
6477   }
6478 
6479   if (*ForceNonTearable != '\0') {
6480     // Allow a command line switch to force the same atomicity property:
6481     const char* class_name_str = _class_name->as_C_string();
6482     if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6483       _is_declared_atomic = true;
6484     }
6485   }
6486 
6487   int itfs_len = _local_interface_indexes == NULL ? 0 : _local_interface_indexes->length();
6488   _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
6489   if (_local_interface_indexes != NULL) {
6490     for (int i = 0; i < _local_interface_indexes->length(); i++) {
6491       u2 interface_index = _local_interface_indexes->at(i);
6492       Klass* interf;
6493       if (cp->tag_at(interface_index).is_klass()) {
6494         interf = cp->resolved_klass_at(interface_index);
6495       } else {
6496         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
6497 
6498         // Don't need to check legal name because it's checked when parsing constant pool.
6499         // But need to make sure it's not an array type.
6500         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6501                             "Bad interface name in class file %s", CHECK);
6502 
6503         // Call resolve_super so class circularity is checked
6504         interf = SystemDictionary::resolve_super_or_fail(
6505                                                   _class_name,
6506                                                   unresolved_klass,
6507                                                   Handle(THREAD, _loader_data->class_loader()),
6508                                                   _protection_domain,
6509                                                   false,
6510                                                   CHECK);
6511       }
6512 
6513       if (!interf->is_interface()) {
6514         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6515                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
6516                           _class_name->as_klass_external_name(),
6517                           interf->external_name(),
6518                           interf->class_in_module_of_loader()));
6519       }
6520 
6521       if (EnableValhalla) {
6522         // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6523         check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6524       }
6525 
6526       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6527         _has_nonstatic_concrete_methods = true;
6528       }
6529       if (InstanceKlass::cast(interf)->is_declared_atomic()) {
6530         _is_declared_atomic = true;
6531       }
6532       _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6533     }
6534   }
6535   assert(_local_interfaces != NULL, "invariant");
6536 
6537   // Compute the transitive list of all unique interfaces implemented by this class
6538   _transitive_interfaces =
6539     compute_transitive_interfaces(_super_klass,
6540                                   _local_interfaces,
6541                                   _loader_data,
6542                                   CHECK);
6543 
6544   assert(_transitive_interfaces != NULL, "invariant");
6545 
6546   // sort methods
6547   _method_ordering = sort_methods(_methods);
6548 
6549   _all_mirandas = new GrowableArray<Method*>(20);
6550 
6551   Handle loader(THREAD, _loader_data->class_loader());
6552   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6553                                                     &_num_miranda_methods,
6554                                                     _all_mirandas,
6555                                                     _super_klass,
6556                                                     _methods,
6557                                                     _access_flags,
6558                                                     _major_version,
6559                                                     loader,
6560                                                     _class_name,
6561                                                     _local_interfaces);
6562 
6563   // Size of Java itable (in words)
6564   _itable_size = is_interface() ? 0 :
6565     klassItable::compute_itable_size(_transitive_interfaces);
6566 
6567   assert(_fac != NULL, "invariant");
6568   assert(_parsed_annotations != NULL, "invariant");
6569 
6570 
6571   if (EnablePrimitiveClasses) {
6572     _inline_type_field_klasses = MetadataFactory::new_array<InlineKlass*>(_loader_data,
6573                                                    java_fields_count(),
6574                                                    NULL,
6575                                                    CHECK);
6576     for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6577       if (Signature::basic_type(fs.signature()) == T_PRIMITIVE_OBJECT && !fs.access_flags().is_static()) {
6578         // Pre-load inline class
6579         Klass* klass = SystemDictionary::resolve_inline_type_field_or_fail(&fs,
6580             Handle(THREAD, _loader_data->class_loader()),
6581             _protection_domain, true, CHECK);
6582         assert(klass != NULL, "Sanity check");
6583         if (!klass->access_flags().is_value_class()) {
6584           assert(klass->is_instance_klass(), "Sanity check");
6585           ResourceMark rm(THREAD);
6586             THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6587                       err_msg("Class %s expects class %s to be an inline type, but it is not",
6588                       _class_name->as_C_string(),
6589                       InstanceKlass::cast(klass)->external_name()));
6590         }
6591         _inline_type_field_klasses->at_put(fs.index(), InlineKlass::cast(klass));
6592       }
6593     }
6594   }
6595 
6596   _field_info = new FieldLayoutInfo();
6597   FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6598       _parsed_annotations->is_contended(), is_inline_type(),
6599       _field_info, _inline_type_field_klasses);
6600   lb.build_layout(CHECK);
6601   if (is_inline_type()) {
6602     _alignment = lb.get_alignment();
6603     _first_field_offset = lb.get_first_field_offset();
6604     _exact_size_in_bytes = lb.get_exact_size_in_byte();
6605   }
6606   _has_inline_type_fields = _field_info->_has_inline_fields;
6607 }
6608 
6609 void ClassFileParser::set_klass(InstanceKlass* klass) {
6610 
6611 #ifdef ASSERT
6612   if (klass != NULL) {
6613     assert(NULL == _klass, "leaking?");
6614   }
6615 #endif
6616 
6617   _klass = klass;
6618 }
6619 
6620 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6621 
6622 #ifdef ASSERT
6623   if (klass != NULL) {
6624     assert(NULL == _klass_to_deallocate, "leaking?");
6625   }
6626 #endif
6627 
6628   _klass_to_deallocate = klass;
6629 }
6630 
6631 // Caller responsible for ResourceMark
6632 // clone stream with rewound position
6633 const ClassFileStream* ClassFileParser::clone_stream() const {
6634   assert(_stream != NULL, "invariant");
6635 
6636   return _stream->clone();
6637 }
6638 
6639 ReferenceType ClassFileParser::super_reference_type() const {
6640   return _super_klass == NULL ? REF_NONE : _super_klass->reference_type();
6641 }
6642 
6643 bool ClassFileParser::is_instance_ref_klass() const {
6644   // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6645   // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6646   // klass requiring special treatment in ref-processing. The abstract
6647   // j.l.r.Reference cannot be instantiated so doesn't partake in
6648   // ref-processing.
6649   return is_java_lang_ref_Reference_subclass();
6650 }
6651 
6652 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6653   if (_super_klass == NULL) {
6654     return false;
6655   }
6656 
6657   if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6658     // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6659     return true;
6660   }
6661 
6662   return _super_klass->reference_type() != REF_NONE;
6663 }
6664 
6665 // ----------------------------------------------------------------------------
6666 // debugging
6667 
6668 #ifdef ASSERT
6669 
6670 // return true if class_name contains no '.' (internal format is '/')
6671 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6672   if (class_name != NULL) {
6673     ResourceMark rm;
6674     char* name = class_name->as_C_string();
6675     return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6676   } else {
6677     return true;
6678   }
6679 }
6680 
6681 #endif