1 /*
   2  * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 #include "precompiled.hpp"
  25 #include "jvm.h"
  26 #include "aot/aotLoader.hpp"
  27 #include "classfile/classFileParser.hpp"
  28 #include "classfile/classFileStream.hpp"
  29 #include "classfile/classLoader.hpp"
  30 #include "classfile/classLoaderData.inline.hpp"
  31 #include "classfile/defaultMethods.hpp"
  32 #include "classfile/dictionary.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/vmSymbols.hpp"
  41 #include "logging/log.hpp"
  42 #include "logging/logStream.hpp"
  43 #include "memory/allocation.hpp"
  44 #include "memory/metadataFactory.hpp"
  45 #include "memory/oopFactory.hpp"
  46 #include "memory/resourceArea.hpp"
  47 #include "memory/universe.hpp"
  48 #include "oops/annotations.hpp"
  49 #include "oops/constantPool.inline.hpp"
  50 #include "oops/fieldStreams.inline.hpp"
  51 #include "oops/instanceKlass.hpp"
  52 #include "oops/instanceMirrorKlass.hpp"
  53 #include "oops/klass.inline.hpp"
  54 #include "oops/klassVtable.hpp"
  55 #include "oops/metadata.hpp"
  56 #include "oops/method.inline.hpp"
  57 #include "oops/oop.inline.hpp"
  58 #include "oops/recordComponent.hpp"
  59 #include "oops/symbol.hpp"
  60 #include "prims/jvmtiExport.hpp"
  61 #include "prims/jvmtiThreadState.hpp"
  62 #include "runtime/arguments.hpp"
  63 #include "runtime/handles.inline.hpp"
  64 #include "runtime/javaCalls.hpp"
  65 #include "runtime/os.hpp"
  66 #include "runtime/perfData.hpp"
  67 #include "runtime/reflection.hpp"
  68 #include "runtime/safepointVerifiers.hpp"
  69 #include "runtime/signature.hpp"
  70 #include "runtime/timer.hpp"
  71 #include "services/classLoadingService.hpp"
  72 #include "services/threadService.hpp"
  73 #include "utilities/align.hpp"
  74 #include "utilities/bitMap.inline.hpp"
  75 #include "utilities/copy.hpp"
  76 #include "utilities/exceptions.hpp"
  77 #include "utilities/globalDefinitions.hpp"
  78 #include "utilities/growableArray.hpp"
  79 #include "utilities/macros.hpp"
  80 #include "utilities/ostream.hpp"
  81 #include "utilities/resourceHash.hpp"
  82 #include "utilities/utf8.hpp"
  83 
  84 #if INCLUDE_CDS
  85 #include "classfile/systemDictionaryShared.hpp"
  86 #endif
  87 #if INCLUDE_JFR
  88 #include "jfr/support/jfrTraceIdExtension.hpp"
  89 #endif
  90 
  91 // We generally try to create the oops directly when parsing, rather than
  92 // allocating temporary data structures and copying the bytes twice. A
  93 // temporary area is only needed when parsing utf8 entries in the constant
  94 // pool and when parsing line number tables.
  95 
  96 // We add assert in debug mode when class format is not checked.
  97 
  98 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
  99 #define JAVA_MIN_SUPPORTED_VERSION        45
 100 #define JAVA_PREVIEW_MINOR_VERSION        65535
 101 
 102 // Used for two backward compatibility reasons:
 103 // - to check for new additions to the class file format in JDK1.5
 104 // - to check for bug fixes in the format checker in JDK1.5
 105 #define JAVA_1_5_VERSION                  49
 106 
 107 // Used for backward compatibility reasons:
 108 // - to check for javac bug fixes that happened after 1.5
 109 // - also used as the max version when running in jdk6
 110 #define JAVA_6_VERSION                    50
 111 
 112 // Used for backward compatibility reasons:
 113 // - to disallow argument and require ACC_STATIC for <clinit> methods
 114 #define JAVA_7_VERSION                    51
 115 
 116 // Extension method support.
 117 #define JAVA_8_VERSION                    52
 118 
 119 #define JAVA_9_VERSION                    53
 120 
 121 #define JAVA_10_VERSION                   54
 122 
 123 #define JAVA_11_VERSION                   55
 124 
 125 #define JAVA_12_VERSION                   56
 126 
 127 #define JAVA_13_VERSION                   57
 128 
 129 #define JAVA_14_VERSION                   58
 130 
 131 #define JAVA_15_VERSION                   59
 132 
 133 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
 134   assert((bad_constant == JVM_CONSTANT_Module ||
 135           bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
 136          "Unexpected bad constant pool entry");
 137   if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
 138 }
 139 
 140 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 141                                                   ConstantPool* cp,
 142                                                   const int length,
 143                                                   TRAPS) {
 144   assert(stream != NULL, "invariant");
 145   assert(cp != NULL, "invariant");
 146 
 147   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 148   // this function (_current can be allocated in a register, with scalar
 149   // replacement of aggregates). The _current pointer is copied back to
 150   // stream() when this function returns. DON'T call another method within
 151   // this method that uses stream().
 152   const ClassFileStream cfs1 = *stream;
 153   const ClassFileStream* const cfs = &cfs1;
 154 
 155   assert(cfs->allocated_on_stack(), "should be local");
 156   debug_only(const u1* const old_current = stream->current();)
 157 
 158   // Used for batching symbol allocations.
 159   const char* names[SymbolTable::symbol_alloc_batch_size];
 160   int lengths[SymbolTable::symbol_alloc_batch_size];
 161   int indices[SymbolTable::symbol_alloc_batch_size];
 162   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 163   int names_count = 0;
 164 
 165   // parsing  Index 0 is unused
 166   for (int index = 1; index < length; index++) {
 167     // Each of the following case guarantees one more byte in the stream
 168     // for the following tag or the access_flags following constant pool,
 169     // so we don't need bounds-check for reading tag.
 170     const u1 tag = cfs->get_u1_fast();
 171     switch (tag) {
 172       case JVM_CONSTANT_Class : {
 173         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 174         const u2 name_index = cfs->get_u2_fast();
 175         cp->klass_index_at_put(index, name_index);
 176         break;
 177       }
 178       case JVM_CONSTANT_Fieldref: {
 179         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 180         const u2 class_index = cfs->get_u2_fast();
 181         const u2 name_and_type_index = cfs->get_u2_fast();
 182         cp->field_at_put(index, class_index, name_and_type_index);
 183         break;
 184       }
 185       case JVM_CONSTANT_Methodref: {
 186         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 187         const u2 class_index = cfs->get_u2_fast();
 188         const u2 name_and_type_index = cfs->get_u2_fast();
 189         cp->method_at_put(index, class_index, name_and_type_index);
 190         break;
 191       }
 192       case JVM_CONSTANT_InterfaceMethodref: {
 193         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 194         const u2 class_index = cfs->get_u2_fast();
 195         const u2 name_and_type_index = cfs->get_u2_fast();
 196         cp->interface_method_at_put(index, class_index, name_and_type_index);
 197         break;
 198       }
 199       case JVM_CONSTANT_String : {
 200         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 201         const u2 string_index = cfs->get_u2_fast();
 202         cp->string_index_at_put(index, string_index);
 203         break;
 204       }
 205       case JVM_CONSTANT_MethodHandle :
 206       case JVM_CONSTANT_MethodType: {
 207         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 208           classfile_parse_error(
 209             "Class file version does not support constant tag %u in class file %s",
 210             tag, CHECK);
 211         }
 212         if (tag == JVM_CONSTANT_MethodHandle) {
 213           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 214           const u1 ref_kind = cfs->get_u1_fast();
 215           const u2 method_index = cfs->get_u2_fast();
 216           cp->method_handle_index_at_put(index, ref_kind, method_index);
 217         }
 218         else if (tag == JVM_CONSTANT_MethodType) {
 219           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 220           const u2 signature_index = cfs->get_u2_fast();
 221           cp->method_type_index_at_put(index, signature_index);
 222         }
 223         else {
 224           ShouldNotReachHere();
 225         }
 226         break;
 227       }
 228       case JVM_CONSTANT_Dynamic : {
 229         if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
 230           classfile_parse_error(
 231               "Class file version does not support constant tag %u in class file %s",
 232               tag, CHECK);
 233         }
 234         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 235         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 236         const u2 name_and_type_index = cfs->get_u2_fast();
 237         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 238           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 239         }
 240         cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
 241         break;
 242       }
 243       case JVM_CONSTANT_InvokeDynamic : {
 244         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 245           classfile_parse_error(
 246               "Class file version does not support constant tag %u in class file %s",
 247               tag, CHECK);
 248         }
 249         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 250         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 251         const u2 name_and_type_index = cfs->get_u2_fast();
 252         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 253           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 254         }
 255         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 256         break;
 257       }
 258       case JVM_CONSTANT_Integer: {
 259         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 260         const u4 bytes = cfs->get_u4_fast();
 261         cp->int_at_put(index, (jint)bytes);
 262         break;
 263       }
 264       case JVM_CONSTANT_Float: {
 265         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 266         const u4 bytes = cfs->get_u4_fast();
 267         cp->float_at_put(index, *(jfloat*)&bytes);
 268         break;
 269       }
 270       case JVM_CONSTANT_Long: {
 271         // A mangled type might cause you to overrun allocated memory
 272         guarantee_property(index + 1 < length,
 273                            "Invalid constant pool entry %u in class file %s",
 274                            index,
 275                            CHECK);
 276         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 277         const u8 bytes = cfs->get_u8_fast();
 278         cp->long_at_put(index, bytes);
 279         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 280         break;
 281       }
 282       case JVM_CONSTANT_Double: {
 283         // A mangled type might cause you to overrun allocated memory
 284         guarantee_property(index+1 < length,
 285                            "Invalid constant pool entry %u in class file %s",
 286                            index,
 287                            CHECK);
 288         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 289         const u8 bytes = cfs->get_u8_fast();
 290         cp->double_at_put(index, *(jdouble*)&bytes);
 291         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 292         break;
 293       }
 294       case JVM_CONSTANT_NameAndType: {
 295         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 296         const u2 name_index = cfs->get_u2_fast();
 297         const u2 signature_index = cfs->get_u2_fast();
 298         cp->name_and_type_at_put(index, name_index, signature_index);
 299         break;
 300       }
 301       case JVM_CONSTANT_Utf8 : {
 302         cfs->guarantee_more(2, CHECK);  // utf8_length
 303         u2  utf8_length = cfs->get_u2_fast();
 304         const u1* utf8_buffer = cfs->current();
 305         assert(utf8_buffer != NULL, "null utf8 buffer");
 306         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 307         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 308         cfs->skip_u1_fast(utf8_length);
 309 
 310         // Before storing the symbol, make sure it's legal
 311         if (_need_verify) {
 312           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 313         }
 314 
 315         if (has_cp_patch_at(index)) {
 316           Handle patch = clear_cp_patch_at(index);
 317           guarantee_property(java_lang_String::is_instance(patch()),
 318                              "Illegal utf8 patch at %d in class file %s",
 319                              index,
 320                              CHECK);
 321           const char* const str = java_lang_String::as_utf8_string(patch());
 322           // (could use java_lang_String::as_symbol instead, but might as well batch them)
 323           utf8_buffer = (const u1*) str;
 324           utf8_length = (u2) strlen(str);
 325         }
 326 
 327         unsigned int hash;
 328         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 329                                                         utf8_length,
 330                                                         hash);
 331         if (result == NULL) {
 332           names[names_count] = (const char*)utf8_buffer;
 333           lengths[names_count] = utf8_length;
 334           indices[names_count] = index;
 335           hashValues[names_count++] = hash;
 336           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 337             SymbolTable::new_symbols(_loader_data,
 338                                      constantPoolHandle(THREAD, cp),
 339                                      names_count,
 340                                      names,
 341                                      lengths,
 342                                      indices,
 343                                      hashValues);
 344             names_count = 0;
 345           }
 346         } else {
 347           cp->symbol_at_put(index, result);
 348         }
 349         break;
 350       }
 351       case JVM_CONSTANT_Module:
 352       case JVM_CONSTANT_Package: {
 353         // Record that an error occurred in these two cases but keep parsing so
 354         // that ACC_Module can be checked for in the access_flags.  Need to
 355         // throw NoClassDefFoundError in that case.
 356         if (_major_version >= JAVA_9_VERSION) {
 357           cfs->guarantee_more(3, CHECK);
 358           cfs->get_u2_fast();
 359           set_class_bad_constant_seen(tag);
 360           break;
 361         }
 362       }
 363       default: {
 364         classfile_parse_error("Unknown constant tag %u in class file %s",
 365                               tag,
 366                               CHECK);
 367         break;
 368       }
 369     } // end of switch(tag)
 370   } // end of for
 371 
 372   // Allocate the remaining symbols
 373   if (names_count > 0) {
 374     SymbolTable::new_symbols(_loader_data,
 375                              constantPoolHandle(THREAD, cp),
 376                              names_count,
 377                              names,
 378                              lengths,
 379                              indices,
 380                              hashValues);
 381   }
 382 
 383   // Copy _current pointer of local copy back to stream.
 384   assert(stream->current() == old_current, "non-exclusive use of stream");
 385   stream->set_current(cfs1.current());
 386 
 387 }
 388 
 389 static inline bool valid_cp_range(int index, int length) {
 390   return (index > 0 && index < length);
 391 }
 392 
 393 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 394   assert(cp != NULL, "invariant");
 395   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 396     return cp->symbol_at(index);
 397   }
 398   return NULL;
 399 }
 400 
 401 #ifdef ASSERT
 402 PRAGMA_DIAG_PUSH
 403 PRAGMA_FORMAT_NONLITERAL_IGNORED
 404 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
 405   ResourceMark rm(THREAD);
 406   fatal(msg, _class_name->as_C_string());
 407 }
 408 
 409 void ClassFileParser::report_assert_property_failure(const char* msg,
 410                                                      int index,
 411                                                      TRAPS) const {
 412   ResourceMark rm(THREAD);
 413   fatal(msg, index, _class_name->as_C_string());
 414 }
 415 PRAGMA_DIAG_POP
 416 #endif
 417 
 418 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 419                                          ConstantPool* const cp,
 420                                          const int length,
 421                                          TRAPS) {
 422   assert(cp != NULL, "invariant");
 423   assert(stream != NULL, "invariant");
 424 
 425   // parsing constant pool entries
 426   parse_constant_pool_entries(stream, cp, length, CHECK);
 427   if (class_bad_constant_seen() != 0) {
 428     // a bad CP entry has been detected previously so stop parsing and just return.
 429     return;
 430   }
 431 
 432   int index = 1;  // declared outside of loops for portability
 433   int num_klasses = 0;
 434 
 435   // first verification pass - validate cross references
 436   // and fixup class and string constants
 437   for (index = 1; index < length; index++) {          // Index 0 is unused
 438     const jbyte tag = cp->tag_at(index).value();
 439     switch (tag) {
 440       case JVM_CONSTANT_Class: {
 441         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 442         break;
 443       }
 444       case JVM_CONSTANT_Fieldref:
 445         // fall through
 446       case JVM_CONSTANT_Methodref:
 447         // fall through
 448       case JVM_CONSTANT_InterfaceMethodref: {
 449         if (!_need_verify) break;
 450         const int klass_ref_index = cp->klass_ref_index_at(index);
 451         const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 452         check_property(valid_klass_reference_at(klass_ref_index),
 453                        "Invalid constant pool index %u in class file %s",
 454                        klass_ref_index, CHECK);
 455         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 456           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 457           "Invalid constant pool index %u in class file %s",
 458           name_and_type_ref_index, CHECK);
 459         break;
 460       }
 461       case JVM_CONSTANT_String: {
 462         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 463         break;
 464       }
 465       case JVM_CONSTANT_Integer:
 466         break;
 467       case JVM_CONSTANT_Float:
 468         break;
 469       case JVM_CONSTANT_Long:
 470       case JVM_CONSTANT_Double: {
 471         index++;
 472         check_property(
 473           (index < length && cp->tag_at(index).is_invalid()),
 474           "Improper constant pool long/double index %u in class file %s",
 475           index, CHECK);
 476         break;
 477       }
 478       case JVM_CONSTANT_NameAndType: {
 479         if (!_need_verify) break;
 480         const int name_ref_index = cp->name_ref_index_at(index);
 481         const int signature_ref_index = cp->signature_ref_index_at(index);
 482         check_property(valid_symbol_at(name_ref_index),
 483           "Invalid constant pool index %u in class file %s",
 484           name_ref_index, CHECK);
 485         check_property(valid_symbol_at(signature_ref_index),
 486           "Invalid constant pool index %u in class file %s",
 487           signature_ref_index, CHECK);
 488         break;
 489       }
 490       case JVM_CONSTANT_Utf8:
 491         break;
 492       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 493       case JVM_CONSTANT_UnresolvedClassInError: {
 494         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 495         break;
 496       }
 497       case JVM_CONSTANT_ClassIndex: {
 498         const int class_index = cp->klass_index_at(index);
 499         check_property(valid_symbol_at(class_index),
 500           "Invalid constant pool index %u in class file %s",
 501           class_index, CHECK);
 502         cp->unresolved_klass_at_put(index, class_index, num_klasses++);
 503         break;
 504       }
 505       case JVM_CONSTANT_StringIndex: {
 506         const int string_index = cp->string_index_at(index);
 507         check_property(valid_symbol_at(string_index),
 508           "Invalid constant pool index %u in class file %s",
 509           string_index, CHECK);
 510         Symbol* const sym = cp->symbol_at(string_index);
 511         cp->unresolved_string_at_put(index, sym);
 512         break;
 513       }
 514       case JVM_CONSTANT_MethodHandle: {
 515         const int ref_index = cp->method_handle_index_at(index);
 516         check_property(valid_cp_range(ref_index, length),
 517           "Invalid constant pool index %u in class file %s",
 518           ref_index, CHECK);
 519         const constantTag tag = cp->tag_at(ref_index);
 520         const int ref_kind = cp->method_handle_ref_kind_at(index);
 521 
 522         switch (ref_kind) {
 523           case JVM_REF_getField:
 524           case JVM_REF_getStatic:
 525           case JVM_REF_putField:
 526           case JVM_REF_putStatic: {
 527             check_property(
 528               tag.is_field(),
 529               "Invalid constant pool index %u in class file %s (not a field)",
 530               ref_index, CHECK);
 531             break;
 532           }
 533           case JVM_REF_invokeVirtual:
 534           case JVM_REF_newInvokeSpecial: {
 535             check_property(
 536               tag.is_method(),
 537               "Invalid constant pool index %u in class file %s (not a method)",
 538               ref_index, CHECK);
 539             break;
 540           }
 541           case JVM_REF_invokeStatic:
 542           case JVM_REF_invokeSpecial: {
 543             check_property(
 544               tag.is_method() ||
 545               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 546               "Invalid constant pool index %u in class file %s (not a method)",
 547               ref_index, CHECK);
 548             break;
 549           }
 550           case JVM_REF_invokeInterface: {
 551             check_property(
 552               tag.is_interface_method(),
 553               "Invalid constant pool index %u in class file %s (not an interface method)",
 554               ref_index, CHECK);
 555             break;
 556           }
 557           default: {
 558             classfile_parse_error(
 559               "Bad method handle kind at constant pool index %u in class file %s",
 560               index, CHECK);
 561           }
 562         } // switch(refkind)
 563         // Keep the ref_index unchanged.  It will be indirected at link-time.
 564         break;
 565       } // case MethodHandle
 566       case JVM_CONSTANT_MethodType: {
 567         const int ref_index = cp->method_type_index_at(index);
 568         check_property(valid_symbol_at(ref_index),
 569           "Invalid constant pool index %u in class file %s",
 570           ref_index, CHECK);
 571         break;
 572       }
 573       case JVM_CONSTANT_Dynamic: {
 574         const int name_and_type_ref_index =
 575           cp->bootstrap_name_and_type_ref_index_at(index);
 576 
 577         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 578           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 579           "Invalid constant pool index %u in class file %s",
 580           name_and_type_ref_index, CHECK);
 581         // bootstrap specifier index must be checked later,
 582         // when BootstrapMethods attr is available
 583 
 584         // Mark the constant pool as having a CONSTANT_Dynamic_info structure
 585         cp->set_has_dynamic_constant();
 586         break;
 587       }
 588       case JVM_CONSTANT_InvokeDynamic: {
 589         const int name_and_type_ref_index =
 590           cp->bootstrap_name_and_type_ref_index_at(index);
 591 
 592         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 593           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 594           "Invalid constant pool index %u in class file %s",
 595           name_and_type_ref_index, CHECK);
 596         // bootstrap specifier index must be checked later,
 597         // when BootstrapMethods attr is available
 598         break;
 599       }
 600       default: {
 601         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 602         ShouldNotReachHere();
 603         break;
 604       }
 605     } // switch(tag)
 606   } // end of for
 607 
 608   _first_patched_klass_resolved_index = num_klasses;
 609   cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK);
 610 
 611   if (_cp_patches != NULL) {
 612     // need to treat this_class specially...
 613 
 614     // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*"
 615     // for now. These will be replaced with actual names of the patched classes in patch_class().
 616     Symbol* s = vmSymbols::star_name();
 617     for (int n=_orig_cp_size; n<cp->length(); n++) {
 618       cp->symbol_at_put(n, s);
 619     }
 620 
 621     int this_class_index;
 622     {
 623       stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
 624       const u1* const mark = stream->current();
 625       stream->skip_u2_fast(1); // skip flags
 626       this_class_index = stream->get_u2_fast();
 627       stream->set_current(mark);  // revert to mark
 628     }
 629 
 630     for (index = 1; index < length; index++) {          // Index 0 is unused
 631       if (has_cp_patch_at(index)) {
 632         guarantee_property(index != this_class_index,
 633           "Illegal constant pool patch to self at %d in class file %s",
 634           index, CHECK);
 635         patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
 636       }
 637     }
 638   }
 639 
 640   if (!_need_verify) {
 641     return;
 642   }
 643 
 644   // second verification pass - checks the strings are of the right format.
 645   // but not yet to the other entries
 646   for (index = 1; index < length; index++) {
 647     const jbyte tag = cp->tag_at(index).value();
 648     switch (tag) {
 649       case JVM_CONSTANT_UnresolvedClass: {
 650         const Symbol* const class_name = cp->klass_name_at(index);
 651         // check the name, even if _cp_patches will overwrite it
 652         verify_legal_class_name(class_name, CHECK);
 653         break;
 654       }
 655       case JVM_CONSTANT_NameAndType: {
 656         if (_need_verify) {
 657           const int sig_index = cp->signature_ref_index_at(index);
 658           const int name_index = cp->name_ref_index_at(index);
 659           const Symbol* const name = cp->symbol_at(name_index);
 660           const Symbol* const sig = cp->symbol_at(sig_index);
 661           guarantee_property(sig->utf8_length() != 0,
 662             "Illegal zero length constant pool entry at %d in class %s",
 663             sig_index, CHECK);
 664           guarantee_property(name->utf8_length() != 0,
 665             "Illegal zero length constant pool entry at %d in class %s",
 666             name_index, CHECK);
 667 
 668           if (Signature::is_method(sig)) {
 669             // Format check method name and signature
 670             verify_legal_method_name(name, CHECK);
 671             verify_legal_method_signature(name, sig, CHECK);
 672           } else {
 673             // Format check field name and signature
 674             verify_legal_field_name(name, CHECK);
 675             verify_legal_field_signature(name, sig, CHECK);
 676           }
 677         }
 678         break;
 679       }
 680       case JVM_CONSTANT_Dynamic: {
 681         const int name_and_type_ref_index =
 682           cp->name_and_type_ref_index_at(index);
 683         // already verified to be utf8
 684         const int name_ref_index =
 685           cp->name_ref_index_at(name_and_type_ref_index);
 686         // already verified to be utf8
 687         const int signature_ref_index =
 688           cp->signature_ref_index_at(name_and_type_ref_index);
 689         const Symbol* const name = cp->symbol_at(name_ref_index);
 690         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 691         if (_need_verify) {
 692           // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
 693           // Need only to be sure signature is the right type.
 694           if (Signature::is_method(signature)) {
 695             throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
 696           }
 697         }
 698         break;
 699       }
 700       case JVM_CONSTANT_InvokeDynamic:
 701       case JVM_CONSTANT_Fieldref:
 702       case JVM_CONSTANT_Methodref:
 703       case JVM_CONSTANT_InterfaceMethodref: {
 704         const int name_and_type_ref_index =
 705           cp->name_and_type_ref_index_at(index);
 706         // already verified to be utf8
 707         const int name_ref_index =
 708           cp->name_ref_index_at(name_and_type_ref_index);
 709         // already verified to be utf8
 710         const int signature_ref_index =
 711           cp->signature_ref_index_at(name_and_type_ref_index);
 712         const Symbol* const name = cp->symbol_at(name_ref_index);
 713         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 714         if (tag == JVM_CONSTANT_Fieldref) {
 715           if (_need_verify) {
 716             // Field name and signature are verified above, when iterating NameAndType_info.
 717             // Need only to be sure signature is non-zero length and the right type.
 718             if (Signature::is_method(signature)) {
 719               throwIllegalSignature("Field", name, signature, CHECK);
 720             }
 721           }
 722         } else {
 723           if (_need_verify) {
 724             // Method name and signature are verified above, when iterating NameAndType_info.
 725             // Need only to be sure signature is non-zero length and the right type.
 726             if (!Signature::is_method(signature)) {
 727               throwIllegalSignature("Method", name, signature, CHECK);
 728             }
 729           }
 730           // 4509014: If a class method name begins with '<', it must be "<init>"
 731           const unsigned int name_len = name->utf8_length();
 732           if (tag == JVM_CONSTANT_Methodref &&
 733               name_len != 0 &&
 734               name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
 735               name != vmSymbols::object_initializer_name()) {
 736             classfile_parse_error(
 737               "Bad method name at constant pool index %u in class file %s",
 738               name_ref_index, CHECK);
 739           }
 740         }
 741         break;
 742       }
 743       case JVM_CONSTANT_MethodHandle: {
 744         const int ref_index = cp->method_handle_index_at(index);
 745         const int ref_kind = cp->method_handle_ref_kind_at(index);
 746         switch (ref_kind) {
 747           case JVM_REF_invokeVirtual:
 748           case JVM_REF_invokeStatic:
 749           case JVM_REF_invokeSpecial:
 750           case JVM_REF_newInvokeSpecial: {
 751             const int name_and_type_ref_index =
 752               cp->name_and_type_ref_index_at(ref_index);
 753             const int name_ref_index =
 754               cp->name_ref_index_at(name_and_type_ref_index);
 755             const Symbol* const name = cp->symbol_at(name_ref_index);
 756             if (ref_kind == JVM_REF_newInvokeSpecial) {
 757               if (name != vmSymbols::object_initializer_name()) {
 758                 classfile_parse_error(
 759                   "Bad constructor name at constant pool index %u in class file %s",
 760                     name_ref_index, CHECK);
 761               }
 762             } else {
 763               if (name == vmSymbols::object_initializer_name()) {
 764                 classfile_parse_error(
 765                   "Bad method name at constant pool index %u in class file %s",
 766                   name_ref_index, CHECK);
 767               }
 768             }
 769             break;
 770           }
 771           // Other ref_kinds are already fully checked in previous pass.
 772         } // switch(ref_kind)
 773         break;
 774       }
 775       case JVM_CONSTANT_MethodType: {
 776         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 777         const Symbol* const signature = cp->method_type_signature_at(index);
 778         verify_legal_method_signature(no_name, signature, CHECK);
 779         break;
 780       }
 781       case JVM_CONSTANT_Utf8: {
 782         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 783       }
 784     }  // switch(tag)
 785   }  // end of for
 786 }
 787 
 788 Handle ClassFileParser::clear_cp_patch_at(int index) {
 789   Handle patch = cp_patch_at(index);
 790   _cp_patches->at_put(index, Handle());
 791   assert(!has_cp_patch_at(index), "");
 792   return patch;
 793 }
 794 
 795 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) {
 796   int name_index = _orig_cp_size + _num_patched_klasses;
 797   int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses;
 798 
 799   cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name);
 800   _num_patched_klasses ++;
 801 }
 802 
 803 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
 804                                           int index,
 805                                           Handle patch,
 806                                           TRAPS) {
 807   assert(cp != NULL, "invariant");
 808 
 809   BasicType patch_type = T_VOID;
 810 
 811   switch (cp->tag_at(index).value()) {
 812 
 813     case JVM_CONSTANT_UnresolvedClass: {
 814       // Patching a class means pre-resolving it.
 815       // The name in the constant pool is ignored.
 816       if (java_lang_Class::is_instance(patch())) {
 817         guarantee_property(!java_lang_Class::is_primitive(patch()),
 818                            "Illegal class patch at %d in class file %s",
 819                            index, CHECK);
 820         Klass* k = java_lang_Class::as_Klass(patch());
 821         patch_class(cp, index, k, k->name());
 822       } else {
 823         guarantee_property(java_lang_String::is_instance(patch()),
 824                            "Illegal class patch at %d in class file %s",
 825                            index, CHECK);
 826         Symbol* const name = java_lang_String::as_symbol(patch());
 827         patch_class(cp, index, NULL, name);
 828       }
 829       break;
 830     }
 831 
 832     case JVM_CONSTANT_String: {
 833       // skip this patch and don't clear it.  Needs the oop array for resolved
 834       // references to be created first.
 835       return;
 836     }
 837     case JVM_CONSTANT_Integer: patch_type = T_INT;    goto patch_prim;
 838     case JVM_CONSTANT_Float:   patch_type = T_FLOAT;  goto patch_prim;
 839     case JVM_CONSTANT_Long:    patch_type = T_LONG;   goto patch_prim;
 840     case JVM_CONSTANT_Double:  patch_type = T_DOUBLE; goto patch_prim;
 841     patch_prim:
 842     {
 843       jvalue value;
 844       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 845       guarantee_property(value_type == patch_type,
 846                          "Illegal primitive patch at %d in class file %s",
 847                          index, CHECK);
 848       switch (value_type) {
 849         case T_INT:    cp->int_at_put(index,   value.i); break;
 850         case T_FLOAT:  cp->float_at_put(index, value.f); break;
 851         case T_LONG:   cp->long_at_put(index,  value.j); break;
 852         case T_DOUBLE: cp->double_at_put(index, value.d); break;
 853         default:       assert(false, "");
 854       }
 855     } // end patch_prim label
 856     break;
 857 
 858     default: {
 859       // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 860       guarantee_property(!has_cp_patch_at(index),
 861                          "Illegal unexpected patch at %d in class file %s",
 862                          index, CHECK);
 863       return;
 864     }
 865   } // end of switch(tag)
 866 
 867   // On fall-through, mark the patch as used.
 868   clear_cp_patch_at(index);
 869 }
 870 class NameSigHash: public ResourceObj {
 871  public:
 872   const Symbol*       _name;       // name
 873   const Symbol*       _sig;        // signature
 874   NameSigHash*  _next;             // Next entry in hash table
 875 };
 876 
 877 static const int HASH_ROW_SIZE = 256;
 878 
 879 static unsigned int hash(const Symbol* name, const Symbol* sig) {
 880   unsigned int raw_hash = 0;
 881   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 882   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 883 
 884   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 885 }
 886 
 887 
 888 static void initialize_hashtable(NameSigHash** table) {
 889   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 890 }
 891 // Return false if the name/sig combination is found in table.
 892 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 893 // The old format checker uses heap sort to find duplicates.
 894 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 895 // of table since we don't expect Symbol*'s to move.
 896 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
 897   assert(name != NULL, "name in constant pool is NULL");
 898 
 899   // First lookup for duplicates
 900   int index = hash(name, sig);
 901   NameSigHash* entry = table[index];
 902   while (entry != NULL) {
 903     if (entry->_name == name && entry->_sig == sig) {
 904       return false;
 905     }
 906     entry = entry->_next;
 907   }
 908 
 909   // No duplicate is found, allocate a new entry and fill it.
 910   entry = new NameSigHash();
 911   entry->_name = name;
 912   entry->_sig = sig;
 913 
 914   // Insert into hash table
 915   entry->_next = table[index];
 916   table[index] = entry;
 917 
 918   return true;
 919 }
 920 
 921 // Side-effects: populates the _local_interfaces field
 922 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
 923                                        const int itfs_len,
 924                                        ConstantPool* const cp,
 925                                        bool* const has_nonstatic_concrete_methods,
 926                                        TRAPS) {
 927   assert(stream != NULL, "invariant");
 928   assert(cp != NULL, "invariant");
 929   assert(has_nonstatic_concrete_methods != NULL, "invariant");
 930 
 931   if (itfs_len == 0) {
 932     _local_interfaces = Universe::the_empty_instance_klass_array();
 933   } else {
 934     assert(itfs_len > 0, "only called for len>0");
 935     _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
 936 
 937     int index;
 938     for (index = 0; index < itfs_len; index++) {
 939       const u2 interface_index = stream->get_u2(CHECK);
 940       Klass* interf;
 941       check_property(
 942         valid_klass_reference_at(interface_index),
 943         "Interface name has bad constant pool index %u in class file %s",
 944         interface_index, CHECK);
 945       if (cp->tag_at(interface_index).is_klass()) {
 946         interf = cp->resolved_klass_at(interface_index);
 947       } else {
 948         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
 949 
 950         // Don't need to check legal name because it's checked when parsing constant pool.
 951         // But need to make sure it's not an array type.
 952         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
 953                            "Bad interface name in class file %s", CHECK);
 954 
 955         // Call resolve_super so classcircularity is checked
 956         interf = SystemDictionary::resolve_super_or_fail(
 957                                                   _class_name,
 958                                                   unresolved_klass,
 959                                                   Handle(THREAD, _loader_data->class_loader()), 
 960                                                   _protection_domain,
 961                                                   false,
 962                                                   CHECK);
 963       }
 964 
 965       if (!interf->is_interface()) {
 966         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 967                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
 968                           _class_name->as_klass_external_name(),
 969                           interf->external_name(),
 970                           interf->class_in_module_of_loader()));
 971       }
 972 
 973       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
 974         *has_nonstatic_concrete_methods = true;
 975       }
 976       _local_interfaces->at_put(index, InstanceKlass::cast(interf));
 977     }
 978 
 979     if (!_need_verify || itfs_len <= 1) {
 980       return;
 981     }
 982 
 983     // Check if there's any duplicates in interfaces
 984     ResourceMark rm(THREAD);
 985     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
 986                                                                  NameSigHash*,
 987                                                                  HASH_ROW_SIZE);
 988     initialize_hashtable(interface_names);
 989     bool dup = false;
 990     const Symbol* name = NULL;
 991     {
 992       debug_only(NoSafepointVerifier nsv;)
 993       for (index = 0; index < itfs_len; index++) {
 994         const InstanceKlass* const k = _local_interfaces->at(index);
 995         name = k->name();
 996         // If no duplicates, add (name, NULL) in hashtable interface_names.
 997         if (!put_after_lookup(name, NULL, interface_names)) {
 998           dup = true;
 999           break;
1000         }
1001       }
1002     }
1003     if (dup) {
1004       classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
1005                              name->as_C_string(), CHECK);
1006     }
1007   }
1008 }
1009 
1010 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
1011                                            int constantvalue_index,
1012                                            int signature_index,
1013                                            TRAPS) const {
1014   // Make sure the constant pool entry is of a type appropriate to this field
1015   guarantee_property(
1016     (constantvalue_index > 0 &&
1017       constantvalue_index < cp->length()),
1018     "Bad initial value index %u in ConstantValue attribute in class file %s",
1019     constantvalue_index, CHECK);
1020 
1021   const constantTag value_type = cp->tag_at(constantvalue_index);
1022   switch(cp->basic_type_for_signature_at(signature_index)) {
1023     case T_LONG: {
1024       guarantee_property(value_type.is_long(),
1025                          "Inconsistent constant value type in class file %s",
1026                          CHECK);
1027       break;
1028     }
1029     case T_FLOAT: {
1030       guarantee_property(value_type.is_float(),
1031                          "Inconsistent constant value type in class file %s",
1032                          CHECK);
1033       break;
1034     }
1035     case T_DOUBLE: {
1036       guarantee_property(value_type.is_double(),
1037                          "Inconsistent constant value type in class file %s",
1038                          CHECK);
1039       break;
1040     }
1041     case T_BYTE:
1042     case T_CHAR:
1043     case T_SHORT:
1044     case T_BOOLEAN:
1045     case T_INT: {
1046       guarantee_property(value_type.is_int(),
1047                          "Inconsistent constant value type in class file %s",
1048                          CHECK);
1049       break;
1050     }
1051     case T_OBJECT: {
1052       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
1053                          && value_type.is_string()),
1054                          "Bad string initial value in class file %s",
1055                          CHECK);
1056       break;
1057     }
1058     default: {
1059       classfile_parse_error("Unable to set initial value %u in class file %s",
1060                              constantvalue_index,
1061                              CHECK);
1062     }
1063   }
1064 }
1065 
1066 class AnnotationCollector : public ResourceObj{
1067 public:
1068   enum Location { _in_field, _in_method, _in_class };
1069   enum ID {
1070     _unknown = 0,
1071     _method_CallerSensitive,
1072     _method_ForceInline,
1073     _method_DontInline,
1074     _method_InjectedProfile,
1075     _method_LambdaForm_Compiled,
1076     _method_Hidden,
1077     _method_HotSpotIntrinsicCandidate,
1078     _jdk_internal_vm_annotation_Contended,
1079     _field_Stable,
1080     _jdk_internal_vm_annotation_ReservedStackAccess,
1081     _annotation_LIMIT
1082   };
1083   const Location _location;
1084   int _annotations_present;
1085   u2 _contended_group;
1086 
1087   AnnotationCollector(Location location)
1088     : _location(location), _annotations_present(0)
1089   {
1090     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
1091   }
1092   // If this annotation name has an ID, report it (or _none).
1093   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
1094   // Set the annotation name:
1095   void set_annotation(ID id) {
1096     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1097     _annotations_present |= nth_bit((int)id);
1098   }
1099 
1100   void remove_annotation(ID id) {
1101     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1102     _annotations_present &= ~nth_bit((int)id);
1103   }
1104 
1105   // Report if the annotation is present.
1106   bool has_any_annotations() const { return _annotations_present != 0; }
1107   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
1108 
1109   void set_contended_group(u2 group) { _contended_group = group; }
1110   u2 contended_group() const { return _contended_group; }
1111 
1112   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
1113 
1114   void set_stable(bool stable) { set_annotation(_field_Stable); }
1115   bool is_stable() const { return has_annotation(_field_Stable); }
1116 };
1117 
1118 // This class also doubles as a holder for metadata cleanup.
1119 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
1120 private:
1121   ClassLoaderData* _loader_data;
1122   AnnotationArray* _field_annotations;
1123   AnnotationArray* _field_type_annotations;
1124 public:
1125   FieldAnnotationCollector(ClassLoaderData* loader_data) :
1126     AnnotationCollector(_in_field),
1127     _loader_data(loader_data),
1128     _field_annotations(NULL),
1129     _field_type_annotations(NULL) {}
1130   ~FieldAnnotationCollector();
1131   void apply_to(FieldInfo* f);
1132   AnnotationArray* field_annotations()      { return _field_annotations; }
1133   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1134 
1135   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
1136   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1137 };
1138 
1139 class MethodAnnotationCollector : public AnnotationCollector{
1140 public:
1141   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1142   void apply_to(const methodHandle& m);
1143 };
1144 
1145 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1146 public:
1147   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1148   void apply_to(InstanceKlass* ik);
1149 };
1150 
1151 
1152 static int skip_annotation_value(const u1*, int, int); // fwd decl
1153 
1154 // Safely increment index by val if does not pass limit
1155 #define SAFE_ADD(index, limit, val) \
1156 if (index >= limit - val) return limit; \
1157 index += val;
1158 
1159 // Skip an annotation.  Return >=limit if there is any problem.
1160 static int skip_annotation(const u1* buffer, int limit, int index) {
1161   assert(buffer != NULL, "invariant");
1162   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1163   // value := switch (tag:u1) { ... }
1164   SAFE_ADD(index, limit, 4); // skip atype and read nmem
1165   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1166   while (--nmem >= 0 && index < limit) {
1167     SAFE_ADD(index, limit, 2); // skip member
1168     index = skip_annotation_value(buffer, limit, index);
1169   }
1170   return index;
1171 }
1172 
1173 // Skip an annotation value.  Return >=limit if there is any problem.
1174 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1175   assert(buffer != NULL, "invariant");
1176 
1177   // value := switch (tag:u1) {
1178   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1179   //   case e: e_class:u2 e_name:u2;
1180   //   case s: s_con:u2;
1181   //   case [: do(nval:u2) {value};
1182   //   case @: annotation;
1183   //   case s: s_con:u2;
1184   // }
1185   SAFE_ADD(index, limit, 1); // read tag
1186   const u1 tag = buffer[index - 1];
1187   switch (tag) {
1188     case 'B':
1189     case 'C':
1190     case 'I':
1191     case 'S':
1192     case 'Z':
1193     case 'D':
1194     case 'F':
1195     case 'J':
1196     case 'c':
1197     case 's':
1198       SAFE_ADD(index, limit, 2);  // skip con or s_con
1199       break;
1200     case 'e':
1201       SAFE_ADD(index, limit, 4);  // skip e_class, e_name
1202       break;
1203     case '[':
1204     {
1205       SAFE_ADD(index, limit, 2); // read nval
1206       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1207       while (--nval >= 0 && index < limit) {
1208         index = skip_annotation_value(buffer, limit, index);
1209       }
1210     }
1211     break;
1212     case '@':
1213       index = skip_annotation(buffer, limit, index);
1214       break;
1215     default:
1216       return limit;  //  bad tag byte
1217   }
1218   return index;
1219 }
1220 
1221 // Sift through annotations, looking for those significant to the VM:
1222 static void parse_annotations(const ConstantPool* const cp,
1223                               const u1* buffer, int limit,
1224                               AnnotationCollector* coll,
1225                               ClassLoaderData* loader_data,
1226                               TRAPS) {
1227 
1228   assert(cp != NULL, "invariant");
1229   assert(buffer != NULL, "invariant");
1230   assert(coll != NULL, "invariant");
1231   assert(loader_data != NULL, "invariant");
1232 
1233   // annotations := do(nann:u2) {annotation}
1234   int index = 2; // read nann
1235   if (index >= limit)  return;
1236   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1237   enum {  // initial annotation layout
1238     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1239     count_off = 2,      // u2   such as 1 (one value)
1240     member_off = 4,     // utf8 such as 'value'
1241     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1242     e_tag_val = 'e',
1243     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1244     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1245     e_size = 11,     // end of 'e' annotation
1246     c_tag_val = 'c',    // payload is type
1247     c_con_off = 7,    // utf8 payload, such as 'I'
1248     c_size = 9,       // end of 'c' annotation
1249     s_tag_val = 's',    // payload is String
1250     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1251     s_size = 9,
1252     min_size = 6        // smallest possible size (zero members)
1253   };
1254   // Cannot add min_size to index in case of overflow MAX_INT
1255   while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1256     int index0 = index;
1257     index = skip_annotation(buffer, limit, index);
1258     const u1* const abase = buffer + index0;
1259     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1260     const int count = Bytes::get_Java_u2((address)abase + count_off);
1261     const Symbol* const aname = check_symbol_at(cp, atype);
1262     if (aname == NULL)  break;  // invalid annotation name
1263     const Symbol* member = NULL;
1264     if (count >= 1) {
1265       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1266       member = check_symbol_at(cp, member_index);
1267       if (member == NULL)  break;  // invalid member name
1268     }
1269 
1270     // Here is where parsing particular annotations will take place.
1271     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1272     if (AnnotationCollector::_unknown == id)  continue;
1273     coll->set_annotation(id);
1274 
1275     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1276       // @Contended can optionally specify the contention group.
1277       //
1278       // Contended group defines the equivalence class over the fields:
1279       // the fields within the same contended group are not treated distinct.
1280       // The only exception is default group, which does not incur the
1281       // equivalence. Naturally, contention group for classes is meaningless.
1282       //
1283       // While the contention group is specified as String, annotation
1284       // values are already interned, and we might as well use the constant
1285       // pool index as the group tag.
1286       //
1287       u2 group_index = 0; // default contended group
1288       if (count == 1
1289         && s_size == (index - index0)  // match size
1290         && s_tag_val == *(abase + tag_off)
1291         && member == vmSymbols::value_name()) {
1292         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1293         if (cp->symbol_at(group_index)->utf8_length() == 0) {
1294           group_index = 0; // default contended group
1295         }
1296       }
1297       coll->set_contended_group(group_index);
1298     }
1299   }
1300 }
1301 
1302 
1303 // Parse attributes for a field.
1304 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1305                                              u2 attributes_count,
1306                                              bool is_static, u2 signature_index,
1307                                              u2* const constantvalue_index_addr,
1308                                              bool* const is_synthetic_addr,
1309                                              u2* const generic_signature_index_addr,
1310                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1311                                              TRAPS) {
1312   assert(cfs != NULL, "invariant");
1313   assert(constantvalue_index_addr != NULL, "invariant");
1314   assert(is_synthetic_addr != NULL, "invariant");
1315   assert(generic_signature_index_addr != NULL, "invariant");
1316   assert(parsed_annotations != NULL, "invariant");
1317   assert(attributes_count > 0, "attributes_count should be greater than 0");
1318 
1319   u2 constantvalue_index = 0;
1320   u2 generic_signature_index = 0;
1321   bool is_synthetic = false;
1322   const u1* runtime_visible_annotations = NULL;
1323   int runtime_visible_annotations_length = 0;
1324   const u1* runtime_invisible_annotations = NULL;
1325   int runtime_invisible_annotations_length = 0;
1326   const u1* runtime_visible_type_annotations = NULL;
1327   int runtime_visible_type_annotations_length = 0;
1328   const u1* runtime_invisible_type_annotations = NULL;
1329   int runtime_invisible_type_annotations_length = 0;
1330   bool runtime_invisible_annotations_exists = false;
1331   bool runtime_invisible_type_annotations_exists = false;
1332   const ConstantPool* const cp = _cp;
1333 
1334   while (attributes_count--) {
1335     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1336     const u2 attribute_name_index = cfs->get_u2_fast();
1337     const u4 attribute_length = cfs->get_u4_fast();
1338     check_property(valid_symbol_at(attribute_name_index),
1339                    "Invalid field attribute index %u in class file %s",
1340                    attribute_name_index,
1341                    CHECK);
1342 
1343     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1344     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1345       // ignore if non-static
1346       if (constantvalue_index != 0) {
1347         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1348       }
1349       check_property(
1350         attribute_length == 2,
1351         "Invalid ConstantValue field attribute length %u in class file %s",
1352         attribute_length, CHECK);
1353 
1354       constantvalue_index = cfs->get_u2(CHECK);
1355       if (_need_verify) {
1356         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1357       }
1358     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1359       if (attribute_length != 0) {
1360         classfile_parse_error(
1361           "Invalid Synthetic field attribute length %u in class file %s",
1362           attribute_length, CHECK);
1363       }
1364       is_synthetic = true;
1365     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1366       if (attribute_length != 0) {
1367         classfile_parse_error(
1368           "Invalid Deprecated field attribute length %u in class file %s",
1369           attribute_length, CHECK);
1370       }
1371     } else if (_major_version >= JAVA_1_5_VERSION) {
1372       if (attribute_name == vmSymbols::tag_signature()) {
1373         if (generic_signature_index != 0) {
1374           classfile_parse_error(
1375             "Multiple Signature attributes for field in class file %s", CHECK);
1376         }
1377         if (attribute_length != 2) {
1378           classfile_parse_error(
1379             "Wrong size %u for field's Signature attribute in class file %s",
1380             attribute_length, CHECK);
1381         }
1382         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1383       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1384         if (runtime_visible_annotations != NULL) {
1385           classfile_parse_error(
1386             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1387         }
1388         runtime_visible_annotations_length = attribute_length;
1389         runtime_visible_annotations = cfs->current();
1390         assert(runtime_visible_annotations != NULL, "null visible annotations");
1391         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1392         parse_annotations(cp,
1393                           runtime_visible_annotations,
1394                           runtime_visible_annotations_length,
1395                           parsed_annotations,
1396                           _loader_data,
1397                           CHECK);
1398         cfs->skip_u1_fast(runtime_visible_annotations_length);
1399       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1400         if (runtime_invisible_annotations_exists) {
1401           classfile_parse_error(
1402             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1403         }
1404         runtime_invisible_annotations_exists = true;
1405         if (PreserveAllAnnotations) {
1406           runtime_invisible_annotations_length = attribute_length;
1407           runtime_invisible_annotations = cfs->current();
1408           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1409         }
1410         cfs->skip_u1(attribute_length, CHECK);
1411       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1412         if (runtime_visible_type_annotations != NULL) {
1413           classfile_parse_error(
1414             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1415         }
1416         runtime_visible_type_annotations_length = attribute_length;
1417         runtime_visible_type_annotations = cfs->current();
1418         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1419         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1420       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1421         if (runtime_invisible_type_annotations_exists) {
1422           classfile_parse_error(
1423             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1424         } else {
1425           runtime_invisible_type_annotations_exists = true;
1426         }
1427         if (PreserveAllAnnotations) {
1428           runtime_invisible_type_annotations_length = attribute_length;
1429           runtime_invisible_type_annotations = cfs->current();
1430           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1431         }
1432         cfs->skip_u1(attribute_length, CHECK);
1433       } else {
1434         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1435       }
1436     } else {
1437       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1438     }
1439   }
1440 
1441   *constantvalue_index_addr = constantvalue_index;
1442   *is_synthetic_addr = is_synthetic;
1443   *generic_signature_index_addr = generic_signature_index;
1444   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1445                                             runtime_visible_annotations_length,
1446                                             runtime_invisible_annotations,
1447                                             runtime_invisible_annotations_length,
1448                                             CHECK);
1449   parsed_annotations->set_field_annotations(a);
1450   a = assemble_annotations(runtime_visible_type_annotations,
1451                            runtime_visible_type_annotations_length,
1452                            runtime_invisible_type_annotations,
1453                            runtime_invisible_type_annotations_length,
1454                            CHECK);
1455   parsed_annotations->set_field_type_annotations(a);
1456   return;
1457 }
1458 
1459 
1460 // Field allocation types. Used for computing field offsets.
1461 
1462 enum FieldAllocationType {
1463   STATIC_OOP,           // Oops
1464   STATIC_BYTE,          // Boolean, Byte, char
1465   STATIC_SHORT,         // shorts
1466   STATIC_WORD,          // ints
1467   STATIC_DOUBLE,        // aligned long or double
1468   NONSTATIC_OOP,
1469   NONSTATIC_BYTE,
1470   NONSTATIC_SHORT,
1471   NONSTATIC_WORD,
1472   NONSTATIC_DOUBLE,
1473   MAX_FIELD_ALLOCATION_TYPE,
1474   BAD_ALLOCATION_TYPE = -1
1475 };
1476 
1477 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1478   BAD_ALLOCATION_TYPE, // 0
1479   BAD_ALLOCATION_TYPE, // 1
1480   BAD_ALLOCATION_TYPE, // 2
1481   BAD_ALLOCATION_TYPE, // 3
1482   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1483   NONSTATIC_SHORT,     // T_CHAR        =  5,
1484   NONSTATIC_WORD,      // T_FLOAT       =  6,
1485   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1486   NONSTATIC_BYTE,      // T_BYTE        =  8,
1487   NONSTATIC_SHORT,     // T_SHORT       =  9,
1488   NONSTATIC_WORD,      // T_INT         = 10,
1489   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1490   NONSTATIC_OOP,       // T_OBJECT      = 12,
1491   NONSTATIC_OOP,       // T_ARRAY       = 13,
1492   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1493   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1494   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1495   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1496   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1497   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1498   BAD_ALLOCATION_TYPE, // 0
1499   BAD_ALLOCATION_TYPE, // 1
1500   BAD_ALLOCATION_TYPE, // 2
1501   BAD_ALLOCATION_TYPE, // 3
1502   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1503   STATIC_SHORT,        // T_CHAR        =  5,
1504   STATIC_WORD,         // T_FLOAT       =  6,
1505   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1506   STATIC_BYTE,         // T_BYTE        =  8,
1507   STATIC_SHORT,        // T_SHORT       =  9,
1508   STATIC_WORD,         // T_INT         = 10,
1509   STATIC_DOUBLE,       // T_LONG        = 11,
1510   STATIC_OOP,          // T_OBJECT      = 12,
1511   STATIC_OOP,          // T_ARRAY       = 13,
1512   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1513   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1514   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1515   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1516   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1517   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1518 };
1519 
1520 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1521   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1522   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1523   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1524   return result;
1525 }
1526 
1527 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1528  public:
1529   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1530 
1531   FieldAllocationCount() {
1532     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1533       count[i] = 0;
1534     }
1535   }
1536 
1537   FieldAllocationType update(bool is_static, BasicType type) {
1538     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1539     if (atype != BAD_ALLOCATION_TYPE) {
1540       // Make sure there is no overflow with injected fields.
1541       assert(count[atype] < 0xFFFF, "More than 65535 fields");
1542       count[atype]++;
1543     }
1544     return atype;
1545   }
1546 };
1547 
1548 // Side-effects: populates the _fields, _fields_annotations,
1549 // _fields_type_annotations fields
1550 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1551                                    bool is_interface,
1552                                    FieldAllocationCount* const fac,
1553                                    ConstantPool* cp,
1554                                    const int cp_size,
1555                                    u2* const java_fields_count_ptr,
1556                                    TRAPS) {
1557 
1558   assert(cfs != NULL, "invariant");
1559   assert(fac != NULL, "invariant");
1560   assert(cp != NULL, "invariant");
1561   assert(java_fields_count_ptr != NULL, "invariant");
1562 
1563   assert(NULL == _fields, "invariant");
1564   assert(NULL == _fields_annotations, "invariant");
1565   assert(NULL == _fields_type_annotations, "invariant");
1566 
1567   cfs->guarantee_more(2, CHECK);  // length
1568   const u2 length = cfs->get_u2_fast();
1569   *java_fields_count_ptr = length;
1570 
1571   int num_injected = 0;
1572   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1573                                                                   &num_injected);
1574   const int total_fields = length + num_injected;
1575 
1576   // The field array starts with tuples of shorts
1577   // [access, name index, sig index, initial value index, byte offset].
1578   // A generic signature slot only exists for field with generic
1579   // signature attribute. And the access flag is set with
1580   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1581   // signature slots are at the end of the field array and after all
1582   // other fields data.
1583   //
1584   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1585   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1586   //       ...
1587   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1588   //       [generic signature index]
1589   //       [generic signature index]
1590   //       ...
1591   //
1592   // Allocate a temporary resource array for field data. For each field,
1593   // a slot is reserved in the temporary array for the generic signature
1594   // index. After parsing all fields, the data are copied to a permanent
1595   // array and any unused slots will be discarded.
1596   ResourceMark rm(THREAD);
1597   u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1598                                               u2,
1599                                               total_fields * (FieldInfo::field_slots + 1));
1600 
1601   // The generic signature slots start after all other fields' data.
1602   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1603   int num_generic_signature = 0;
1604   for (int n = 0; n < length; n++) {
1605     // access_flags, name_index, descriptor_index, attributes_count
1606     cfs->guarantee_more(8, CHECK);
1607 
1608     AccessFlags access_flags;
1609     const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1610     verify_legal_field_modifiers(flags, is_interface, CHECK);
1611     access_flags.set_flags(flags);
1612 
1613     const u2 name_index = cfs->get_u2_fast();
1614     check_property(valid_symbol_at(name_index),
1615       "Invalid constant pool index %u for field name in class file %s",
1616       name_index, CHECK);
1617     const Symbol* const name = cp->symbol_at(name_index);
1618     verify_legal_field_name(name, CHECK);
1619 
1620     const u2 signature_index = cfs->get_u2_fast();
1621     check_property(valid_symbol_at(signature_index),
1622       "Invalid constant pool index %u for field signature in class file %s",
1623       signature_index, CHECK);
1624     const Symbol* const sig = cp->symbol_at(signature_index);
1625     verify_legal_field_signature(name, sig, CHECK);
1626 
1627     u2 constantvalue_index = 0;
1628     bool is_synthetic = false;
1629     u2 generic_signature_index = 0;
1630     const bool is_static = access_flags.is_static();
1631     FieldAnnotationCollector parsed_annotations(_loader_data);
1632 
1633     const u2 attributes_count = cfs->get_u2_fast();
1634     if (attributes_count > 0) {
1635       parse_field_attributes(cfs,
1636                              attributes_count,
1637                              is_static,
1638                              signature_index,
1639                              &constantvalue_index,
1640                              &is_synthetic,
1641                              &generic_signature_index,
1642                              &parsed_annotations,
1643                              CHECK);
1644 
1645       if (parsed_annotations.field_annotations() != NULL) {
1646         if (_fields_annotations == NULL) {
1647           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1648                                              _loader_data, length, NULL,
1649                                              CHECK);
1650         }
1651         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1652         parsed_annotations.set_field_annotations(NULL);
1653       }
1654       if (parsed_annotations.field_type_annotations() != NULL) {
1655         if (_fields_type_annotations == NULL) {
1656           _fields_type_annotations =
1657             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1658                                                          length,
1659                                                          NULL,
1660                                                          CHECK);
1661         }
1662         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1663         parsed_annotations.set_field_type_annotations(NULL);
1664       }
1665 
1666       if (is_synthetic) {
1667         access_flags.set_is_synthetic();
1668       }
1669       if (generic_signature_index != 0) {
1670         access_flags.set_field_has_generic_signature();
1671         fa[generic_signature_slot] = generic_signature_index;
1672         generic_signature_slot ++;
1673         num_generic_signature ++;
1674       }
1675     }
1676 
1677     FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1678     field->initialize(access_flags.as_short(),
1679                       name_index,
1680                       signature_index,
1681                       constantvalue_index);
1682     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1683 
1684     // Remember how many oops we encountered and compute allocation type
1685     const FieldAllocationType atype = fac->update(is_static, type);
1686     field->set_allocation_type(atype);
1687 
1688     // After field is initialized with type, we can augment it with aux info
1689     if (parsed_annotations.has_any_annotations())
1690       parsed_annotations.apply_to(field);
1691   }
1692 
1693   int index = length;
1694   if (num_injected != 0) {
1695     for (int n = 0; n < num_injected; n++) {
1696       // Check for duplicates
1697       if (injected[n].may_be_java) {
1698         const Symbol* const name      = injected[n].name();
1699         const Symbol* const signature = injected[n].signature();
1700         bool duplicate = false;
1701         for (int i = 0; i < length; i++) {
1702           const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1703           if (name      == cp->symbol_at(f->name_index()) &&
1704               signature == cp->symbol_at(f->signature_index())) {
1705             // Symbol is desclared in Java so skip this one
1706             duplicate = true;
1707             break;
1708           }
1709         }
1710         if (duplicate) {
1711           // These will be removed from the field array at the end
1712           continue;
1713         }
1714       }
1715 
1716       // Injected field
1717       FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1718       field->initialize(JVM_ACC_FIELD_INTERNAL,
1719                         injected[n].name_index,
1720                         injected[n].signature_index,
1721                         0);
1722 
1723       const BasicType type = Signature::basic_type(injected[n].signature());
1724 
1725       // Remember how many oops we encountered and compute allocation type
1726       const FieldAllocationType atype = fac->update(false, type);
1727       field->set_allocation_type(atype);
1728       index++;
1729     }
1730   }
1731 
1732   assert(NULL == _fields, "invariant");
1733 
1734   _fields =
1735     MetadataFactory::new_array<u2>(_loader_data,
1736                                    index * FieldInfo::field_slots + num_generic_signature,
1737                                    CHECK);
1738   // Sometimes injected fields already exist in the Java source so
1739   // the fields array could be too long.  In that case the
1740   // fields array is trimed. Also unused slots that were reserved
1741   // for generic signature indexes are discarded.
1742   {
1743     int i = 0;
1744     for (; i < index * FieldInfo::field_slots; i++) {
1745       _fields->at_put(i, fa[i]);
1746     }
1747     for (int j = total_fields * FieldInfo::field_slots;
1748          j < generic_signature_slot; j++) {
1749       _fields->at_put(i++, fa[j]);
1750     }
1751     assert(_fields->length() == i, "");
1752   }
1753 
1754   if (_need_verify && length > 1) {
1755     // Check duplicated fields
1756     ResourceMark rm(THREAD);
1757     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1758       THREAD, NameSigHash*, HASH_ROW_SIZE);
1759     initialize_hashtable(names_and_sigs);
1760     bool dup = false;
1761     const Symbol* name = NULL;
1762     const Symbol* sig = NULL;
1763     {
1764       debug_only(NoSafepointVerifier nsv;)
1765       for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1766         name = fs.name();
1767         sig = fs.signature();
1768         // If no duplicates, add name/signature in hashtable names_and_sigs.
1769         if (!put_after_lookup(name, sig, names_and_sigs)) {
1770           dup = true;
1771           break;
1772         }
1773       }
1774     }
1775     if (dup) {
1776       classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1777                              name->as_C_string(), sig->as_klass_external_name(), CHECK);
1778     }
1779   }
1780 }
1781 
1782 
1783 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1784                                                                          u4 code_length,
1785                                                                          u4 exception_table_length,
1786                                                                          TRAPS) {
1787   assert(cfs != NULL, "invariant");
1788 
1789   const unsafe_u2* const exception_table_start = cfs->current();
1790   assert(exception_table_start != NULL, "null exception table");
1791 
1792   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1793                                                                // end_pc,
1794                                                                // handler_pc,
1795                                                                // catch_type_index
1796 
1797   // Will check legal target after parsing code array in verifier.
1798   if (_need_verify) {
1799     for (unsigned int i = 0; i < exception_table_length; i++) {
1800       const u2 start_pc = cfs->get_u2_fast();
1801       const u2 end_pc = cfs->get_u2_fast();
1802       const u2 handler_pc = cfs->get_u2_fast();
1803       const u2 catch_type_index = cfs->get_u2_fast();
1804       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1805                          "Illegal exception table range in class file %s",
1806                          CHECK_NULL);
1807       guarantee_property(handler_pc < code_length,
1808                          "Illegal exception table handler in class file %s",
1809                          CHECK_NULL);
1810       if (catch_type_index != 0) {
1811         guarantee_property(valid_klass_reference_at(catch_type_index),
1812                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1813       }
1814     }
1815   } else {
1816     cfs->skip_u2_fast(exception_table_length * 4);
1817   }
1818   return exception_table_start;
1819 }
1820 
1821 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1822                                              u4 code_length,
1823                                              CompressedLineNumberWriteStream**const write_stream,
1824                                              TRAPS) {
1825 
1826   const ClassFileStream* const cfs = _stream;
1827   unsigned int num_entries = cfs->get_u2(CHECK);
1828 
1829   // Each entry is a u2 start_pc, and a u2 line_number
1830   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1831 
1832   // Verify line number attribute and table length
1833   check_property(
1834     code_attribute_length == sizeof(u2) + length_in_bytes,
1835     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1836 
1837   cfs->guarantee_more(length_in_bytes, CHECK);
1838 
1839   if ((*write_stream) == NULL) {
1840     if (length_in_bytes > fixed_buffer_size) {
1841       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1842     } else {
1843       (*write_stream) = new CompressedLineNumberWriteStream(
1844         _linenumbertable_buffer, fixed_buffer_size);
1845     }
1846   }
1847 
1848   while (num_entries-- > 0) {
1849     const u2 bci  = cfs->get_u2_fast(); // start_pc
1850     const u2 line = cfs->get_u2_fast(); // line_number
1851     guarantee_property(bci < code_length,
1852         "Invalid pc in LineNumberTable in class file %s", CHECK);
1853     (*write_stream)->write_pair(bci, line);
1854   }
1855 }
1856 
1857 
1858 class LVT_Hash : public AllStatic {
1859  public:
1860 
1861   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1862   /*
1863    * 3-tuple start_bci/length/slot has to be unique key,
1864    * so the following comparison seems to be redundant:
1865    *       && elem->name_cp_index == entry->_elem->name_cp_index
1866    */
1867     return (e0.start_bci     == e1.start_bci &&
1868             e0.length        == e1.length &&
1869             e0.name_cp_index == e1.name_cp_index &&
1870             e0.slot          == e1.slot);
1871   }
1872 
1873   static unsigned int hash(LocalVariableTableElement const& e0) {
1874     unsigned int raw_hash = e0.start_bci;
1875 
1876     raw_hash = e0.length        + raw_hash * 37;
1877     raw_hash = e0.name_cp_index + raw_hash * 37;
1878     raw_hash = e0.slot          + raw_hash * 37;
1879 
1880     return raw_hash;
1881   }
1882 };
1883 
1884 
1885 // Class file LocalVariableTable elements.
1886 class Classfile_LVT_Element {
1887  public:
1888   u2 start_bci;
1889   u2 length;
1890   u2 name_cp_index;
1891   u2 descriptor_cp_index;
1892   u2 slot;
1893 };
1894 
1895 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1896                              LocalVariableTableElement* const lvt) {
1897   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1898   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1899   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1900   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1901   lvt->signature_cp_index  = 0;
1902   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1903 }
1904 
1905 // Function is used to parse both attributes:
1906 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1907 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1908                                                                              u4 code_length,
1909                                                                              u2 max_locals,
1910                                                                              u4 code_attribute_length,
1911                                                                              u2* const localvariable_table_length,
1912                                                                              bool isLVTT,
1913                                                                              TRAPS) {
1914   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1915   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1916   const unsigned int size =
1917     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1918 
1919   const ConstantPool* const cp = _cp;
1920 
1921   // Verify local variable table attribute has right length
1922   if (_need_verify) {
1923     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1924                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1925   }
1926 
1927   const unsafe_u2* const localvariable_table_start = cfs->current();
1928   assert(localvariable_table_start != NULL, "null local variable table");
1929   if (!_need_verify) {
1930     cfs->skip_u2_fast(size);
1931   } else {
1932     cfs->guarantee_more(size * 2, CHECK_NULL);
1933     for(int i = 0; i < (*localvariable_table_length); i++) {
1934       const u2 start_pc = cfs->get_u2_fast();
1935       const u2 length = cfs->get_u2_fast();
1936       const u2 name_index = cfs->get_u2_fast();
1937       const u2 descriptor_index = cfs->get_u2_fast();
1938       const u2 index = cfs->get_u2_fast();
1939       // Assign to a u4 to avoid overflow
1940       const u4 end_pc = (u4)start_pc + (u4)length;
1941 
1942       if (start_pc >= code_length) {
1943         classfile_parse_error(
1944           "Invalid start_pc %u in %s in class file %s",
1945           start_pc, tbl_name, CHECK_NULL);
1946       }
1947       if (end_pc > code_length) {
1948         classfile_parse_error(
1949           "Invalid length %u in %s in class file %s",
1950           length, tbl_name, CHECK_NULL);
1951       }
1952       const int cp_size = cp->length();
1953       guarantee_property(valid_symbol_at(name_index),
1954         "Name index %u in %s has bad constant type in class file %s",
1955         name_index, tbl_name, CHECK_NULL);
1956       guarantee_property(valid_symbol_at(descriptor_index),
1957         "Signature index %u in %s has bad constant type in class file %s",
1958         descriptor_index, tbl_name, CHECK_NULL);
1959 
1960       const Symbol* const name = cp->symbol_at(name_index);
1961       const Symbol* const sig = cp->symbol_at(descriptor_index);
1962       verify_legal_field_name(name, CHECK_NULL);
1963       u2 extra_slot = 0;
1964       if (!isLVTT) {
1965         verify_legal_field_signature(name, sig, CHECK_NULL);
1966 
1967         // 4894874: check special cases for double and long local variables
1968         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1969             sig == vmSymbols::type_signature(T_LONG)) {
1970           extra_slot = 1;
1971         }
1972       }
1973       guarantee_property((index + extra_slot) < max_locals,
1974                           "Invalid index %u in %s in class file %s",
1975                           index, tbl_name, CHECK_NULL);
1976     }
1977   }
1978   return localvariable_table_start;
1979 }
1980 
1981 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1982                                       u4 code_attribute_length,
1983                                       bool need_verify,
1984                                       TRAPS) {
1985   assert(cfs != NULL, "invariant");
1986 
1987   if (0 == code_attribute_length) {
1988     return NULL;
1989   }
1990 
1991   const u1* const stackmap_table_start = cfs->current();
1992   assert(stackmap_table_start != NULL, "null stackmap table");
1993 
1994   // check code_attribute_length first
1995   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1996 
1997   if (!need_verify && !DumpSharedSpaces) {
1998     return NULL;
1999   }
2000   return stackmap_table_start;
2001 }
2002 
2003 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
2004                                                                             u2* const checked_exceptions_length,
2005                                                                             u4 method_attribute_length,
2006                                                                             TRAPS) {
2007   assert(cfs != NULL, "invariant");
2008   assert(checked_exceptions_length != NULL, "invariant");
2009 
2010   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
2011   *checked_exceptions_length = cfs->get_u2_fast();
2012   const unsigned int size =
2013     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
2014   const unsafe_u2* const checked_exceptions_start = cfs->current();
2015   assert(checked_exceptions_start != NULL, "null checked exceptions");
2016   if (!_need_verify) {
2017     cfs->skip_u2_fast(size);
2018   } else {
2019     // Verify each value in the checked exception table
2020     u2 checked_exception;
2021     const u2 len = *checked_exceptions_length;
2022     cfs->guarantee_more(2 * len, CHECK_NULL);
2023     for (int i = 0; i < len; i++) {
2024       checked_exception = cfs->get_u2_fast();
2025       check_property(
2026         valid_klass_reference_at(checked_exception),
2027         "Exception name has bad type at constant pool %u in class file %s",
2028         checked_exception, CHECK_NULL);
2029     }
2030   }
2031   // check exceptions attribute length
2032   if (_need_verify) {
2033     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2034                                                    sizeof(u2) * size),
2035                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2036   }
2037   return checked_exceptions_start;
2038 }
2039 
2040 void ClassFileParser::throwIllegalSignature(const char* type,
2041                                             const Symbol* name,
2042                                             const Symbol* sig,
2043                                             TRAPS) const {
2044   assert(name != NULL, "invariant");
2045   assert(sig != NULL, "invariant");
2046 
2047   ResourceMark rm(THREAD);
2048   Exceptions::fthrow(THREAD_AND_LOCATION,
2049       vmSymbols::java_lang_ClassFormatError(),
2050       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
2051       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
2052 }
2053 
2054 AnnotationCollector::ID
2055 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2056                                       const Symbol* name) {
2057   const vmSymbols::SID sid = vmSymbols::find_sid(name);
2058   // Privileged code can use all annotations.  Other code silently drops some.
2059   const bool privileged = loader_data->is_the_null_class_loader_data() ||
2060                           loader_data->is_platform_class_loader_data() ||
2061                           loader_data->is_unsafe_anonymous();
2062   switch (sid) {
2063     case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2064       if (_location != _in_method)  break;  // only allow for methods
2065       if (!privileged)              break;  // only allow in privileged code
2066       return _method_CallerSensitive;
2067     }
2068     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2069       if (_location != _in_method)  break;  // only allow for methods
2070       if (!privileged)              break;  // only allow in privileged code
2071       return _method_ForceInline;
2072     }
2073     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
2074       if (_location != _in_method)  break;  // only allow for methods
2075       if (!privileged)              break;  // only allow in privileged code
2076       return _method_DontInline;
2077     }
2078     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
2079       if (_location != _in_method)  break;  // only allow for methods
2080       if (!privileged)              break;  // only allow in privileged code
2081       return _method_InjectedProfile;
2082     }
2083     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
2084       if (_location != _in_method)  break;  // only allow for methods
2085       if (!privileged)              break;  // only allow in privileged code
2086       return _method_LambdaForm_Compiled;
2087     }
2088     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
2089       if (_location != _in_method)  break;  // only allow for methods
2090       if (!privileged)              break;  // only allow in privileged code
2091       return _method_Hidden;
2092     }
2093     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2094       if (_location != _in_method)  break;  // only allow for methods
2095       if (!privileged)              break;  // only allow in privileged code
2096       return _method_HotSpotIntrinsicCandidate;
2097     }
2098     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2099       if (_location != _in_field)   break;  // only allow for fields
2100       if (!privileged)              break;  // only allow in privileged code
2101       return _field_Stable;
2102     }
2103     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2104       if (_location != _in_field && _location != _in_class) {
2105         break;  // only allow for fields and classes
2106       }
2107       if (!EnableContended || (RestrictContended && !privileged)) {
2108         break;  // honor privileges
2109       }
2110       return _jdk_internal_vm_annotation_Contended;
2111     }
2112     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2113       if (_location != _in_method)  break;  // only allow for methods
2114       if (RestrictReservedStack && !privileged) break; // honor privileges
2115       return _jdk_internal_vm_annotation_ReservedStackAccess;
2116     }
2117     default: {
2118       break;
2119     }
2120   }
2121   return AnnotationCollector::_unknown;
2122 }
2123 
2124 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2125   if (is_contended())
2126     f->set_contended_group(contended_group());
2127   if (is_stable())
2128     f->set_stable(true);
2129 }
2130 
2131 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2132   // If there's an error deallocate metadata for field annotations
2133   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2134   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2135 }
2136 
2137 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2138   if (has_annotation(_method_CallerSensitive))
2139     m->set_caller_sensitive(true);
2140   if (has_annotation(_method_ForceInline))
2141     m->set_force_inline(true);
2142   if (has_annotation(_method_DontInline))
2143     m->set_dont_inline(true);
2144   if (has_annotation(_method_InjectedProfile))
2145     m->set_has_injected_profile(true);
2146   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2147     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2148   if (has_annotation(_method_Hidden))
2149     m->set_hidden(true);
2150   if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2151     m->set_intrinsic_candidate(true);
2152   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2153     m->set_has_reserved_stack_access(true);
2154 }
2155 
2156 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2157   assert(ik != NULL, "invariant");
2158   ik->set_is_contended(is_contended());
2159 }
2160 
2161 #define MAX_ARGS_SIZE 255
2162 #define MAX_CODE_SIZE 65535
2163 #define INITIAL_MAX_LVT_NUMBER 256
2164 
2165 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2166  *
2167  * Rules for LVT's and LVTT's are:
2168  *   - There can be any number of LVT's and LVTT's.
2169  *   - If there are n LVT's, it is the same as if there was just
2170  *     one LVT containing all the entries from the n LVT's.
2171  *   - There may be no more than one LVT entry per local variable.
2172  *     Two LVT entries are 'equal' if these fields are the same:
2173  *        start_pc, length, name, slot
2174  *   - There may be no more than one LVTT entry per each LVT entry.
2175  *     Each LVTT entry has to match some LVT entry.
2176  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2177  */
2178 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2179                                                int lvt_cnt,
2180                                                u2* const localvariable_table_length,
2181                                                const unsafe_u2** const localvariable_table_start,
2182                                                int lvtt_cnt,
2183                                                u2* const localvariable_type_table_length,
2184                                                const unsafe_u2** const localvariable_type_table_start,
2185                                                TRAPS) {
2186 
2187   ResourceMark rm(THREAD);
2188 
2189   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2190                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2191 
2192   LVT_HashTable* const table = new LVT_HashTable();
2193 
2194   // To fill LocalVariableTable in
2195   const Classfile_LVT_Element* cf_lvt;
2196   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2197 
2198   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2199     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2200     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2201       copy_lvt_element(&cf_lvt[idx], lvt);
2202       // If no duplicates, add LVT elem in hashtable.
2203       if (table->put(*lvt, lvt) == false
2204           && _need_verify
2205           && _major_version >= JAVA_1_5_VERSION) {
2206         classfile_parse_error("Duplicated LocalVariableTable attribute "
2207                               "entry for '%s' in class file %s",
2208                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2209                                CHECK);
2210       }
2211     }
2212   }
2213 
2214   // To merge LocalVariableTable and LocalVariableTypeTable
2215   const Classfile_LVT_Element* cf_lvtt;
2216   LocalVariableTableElement lvtt_elem;
2217 
2218   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2219     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2220     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2221       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2222       LocalVariableTableElement** entry = table->get(lvtt_elem);
2223       if (entry == NULL) {
2224         if (_need_verify) {
2225           classfile_parse_error("LVTT entry for '%s' in class file %s "
2226                                 "does not match any LVT entry",
2227                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2228                                  CHECK);
2229         }
2230       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2231         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2232                               "entry for '%s' in class file %s",
2233                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2234                                CHECK);
2235       } else {
2236         // to add generic signatures into LocalVariableTable
2237         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2238       }
2239     }
2240   }
2241 }
2242 
2243 
2244 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2245                                        const u1* runtime_visible_annotations,
2246                                        int runtime_visible_annotations_length,
2247                                        const u1* runtime_invisible_annotations,
2248                                        int runtime_invisible_annotations_length,
2249                                        const u1* runtime_visible_parameter_annotations,
2250                                        int runtime_visible_parameter_annotations_length,
2251                                        const u1* runtime_invisible_parameter_annotations,
2252                                        int runtime_invisible_parameter_annotations_length,
2253                                        const u1* runtime_visible_type_annotations,
2254                                        int runtime_visible_type_annotations_length,
2255                                        const u1* runtime_invisible_type_annotations,
2256                                        int runtime_invisible_type_annotations_length,
2257                                        const u1* annotation_default,
2258                                        int annotation_default_length,
2259                                        TRAPS) {
2260 
2261   AnnotationArray* a;
2262 
2263   if (runtime_visible_annotations_length +
2264       runtime_invisible_annotations_length > 0) {
2265      a = assemble_annotations(runtime_visible_annotations,
2266                               runtime_visible_annotations_length,
2267                               runtime_invisible_annotations,
2268                               runtime_invisible_annotations_length,
2269                               CHECK);
2270      cm->set_method_annotations(a);
2271   }
2272 
2273   if (runtime_visible_parameter_annotations_length +
2274       runtime_invisible_parameter_annotations_length > 0) {
2275     a = assemble_annotations(runtime_visible_parameter_annotations,
2276                              runtime_visible_parameter_annotations_length,
2277                              runtime_invisible_parameter_annotations,
2278                              runtime_invisible_parameter_annotations_length,
2279                              CHECK);
2280     cm->set_parameter_annotations(a);
2281   }
2282 
2283   if (annotation_default_length > 0) {
2284     a = assemble_annotations(annotation_default,
2285                              annotation_default_length,
2286                              NULL,
2287                              0,
2288                              CHECK);
2289     cm->set_default_annotations(a);
2290   }
2291 
2292   if (runtime_visible_type_annotations_length +
2293       runtime_invisible_type_annotations_length > 0) {
2294     a = assemble_annotations(runtime_visible_type_annotations,
2295                              runtime_visible_type_annotations_length,
2296                              runtime_invisible_type_annotations,
2297                              runtime_invisible_type_annotations_length,
2298                              CHECK);
2299     cm->set_type_annotations(a);
2300   }
2301 }
2302 
2303 
2304 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2305 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2306 // Method* to save footprint, so we only know the size of the resulting Method* when the
2307 // entire method attribute is parsed.
2308 //
2309 // The promoted_flags parameter is used to pass relevant access_flags
2310 // from the method back up to the containing klass. These flag values
2311 // are added to klass's access_flags.
2312 
2313 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2314                                       bool is_interface,
2315                                       const ConstantPool* cp,
2316                                       AccessFlags* const promoted_flags,
2317                                       TRAPS) {
2318   assert(cfs != NULL, "invariant");
2319   assert(cp != NULL, "invariant");
2320   assert(promoted_flags != NULL, "invariant");
2321 
2322   ResourceMark rm(THREAD);
2323   // Parse fixed parts:
2324   // access_flags, name_index, descriptor_index, attributes_count
2325   cfs->guarantee_more(8, CHECK_NULL);
2326 
2327   int flags = cfs->get_u2_fast();
2328   const u2 name_index = cfs->get_u2_fast();
2329   const int cp_size = cp->length();
2330   check_property(
2331     valid_symbol_at(name_index),
2332     "Illegal constant pool index %u for method name in class file %s",
2333     name_index, CHECK_NULL);
2334   const Symbol* const name = cp->symbol_at(name_index);
2335   verify_legal_method_name(name, CHECK_NULL);
2336 
2337   const u2 signature_index = cfs->get_u2_fast();
2338   guarantee_property(
2339     valid_symbol_at(signature_index),
2340     "Illegal constant pool index %u for method signature in class file %s",
2341     signature_index, CHECK_NULL);
2342   const Symbol* const signature = cp->symbol_at(signature_index);
2343 
2344   if (name == vmSymbols::class_initializer_name()) {
2345     // We ignore the other access flags for a valid class initializer.
2346     // (JVM Spec 2nd ed., chapter 4.6)
2347     if (_major_version < 51) { // backward compatibility
2348       flags = JVM_ACC_STATIC;
2349     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2350       flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2351     } else {
2352       classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2353     }
2354   } else {
2355     verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2356   }
2357 
2358   if (name == vmSymbols::object_initializer_name() && is_interface) {
2359     classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2360   }
2361 
2362   int args_size = -1;  // only used when _need_verify is true
2363   if (_need_verify) {
2364     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2365                  verify_legal_method_signature(name, signature, CHECK_NULL);
2366     if (args_size > MAX_ARGS_SIZE) {
2367       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2368     }
2369   }
2370 
2371   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2372 
2373   // Default values for code and exceptions attribute elements
2374   u2 max_stack = 0;
2375   u2 max_locals = 0;
2376   u4 code_length = 0;
2377   const u1* code_start = 0;
2378   u2 exception_table_length = 0;
2379   const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2380   Array<int>* exception_handlers = Universe::the_empty_int_array();
2381   u2 checked_exceptions_length = 0;
2382   const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements
2383   CompressedLineNumberWriteStream* linenumber_table = NULL;
2384   int linenumber_table_length = 0;
2385   int total_lvt_length = 0;
2386   u2 lvt_cnt = 0;
2387   u2 lvtt_cnt = 0;
2388   bool lvt_allocated = false;
2389   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2390   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2391   u2* localvariable_table_length = NULL;
2392   const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes
2393   u2* localvariable_type_table_length = NULL;
2394   const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes
2395   int method_parameters_length = -1;
2396   const u1* method_parameters_data = NULL;
2397   bool method_parameters_seen = false;
2398   bool parsed_code_attribute = false;
2399   bool parsed_checked_exceptions_attribute = false;
2400   bool parsed_stackmap_attribute = false;
2401   // stackmap attribute - JDK1.5
2402   const u1* stackmap_data = NULL;
2403   int stackmap_data_length = 0;
2404   u2 generic_signature_index = 0;
2405   MethodAnnotationCollector parsed_annotations;
2406   const u1* runtime_visible_annotations = NULL;
2407   int runtime_visible_annotations_length = 0;
2408   const u1* runtime_invisible_annotations = NULL;
2409   int runtime_invisible_annotations_length = 0;
2410   const u1* runtime_visible_parameter_annotations = NULL;
2411   int runtime_visible_parameter_annotations_length = 0;
2412   const u1* runtime_invisible_parameter_annotations = NULL;
2413   int runtime_invisible_parameter_annotations_length = 0;
2414   const u1* runtime_visible_type_annotations = NULL;
2415   int runtime_visible_type_annotations_length = 0;
2416   const u1* runtime_invisible_type_annotations = NULL;
2417   int runtime_invisible_type_annotations_length = 0;
2418   bool runtime_invisible_annotations_exists = false;
2419   bool runtime_invisible_type_annotations_exists = false;
2420   bool runtime_invisible_parameter_annotations_exists = false;
2421   const u1* annotation_default = NULL;
2422   int annotation_default_length = 0;
2423 
2424   // Parse code and exceptions attribute
2425   u2 method_attributes_count = cfs->get_u2_fast();
2426   while (method_attributes_count--) {
2427     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2428     const u2 method_attribute_name_index = cfs->get_u2_fast();
2429     const u4 method_attribute_length = cfs->get_u4_fast();
2430     check_property(
2431       valid_symbol_at(method_attribute_name_index),
2432       "Invalid method attribute name index %u in class file %s",
2433       method_attribute_name_index, CHECK_NULL);
2434 
2435     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2436     if (method_attribute_name == vmSymbols::tag_code()) {
2437       // Parse Code attribute
2438       if (_need_verify) {
2439         guarantee_property(
2440             !access_flags.is_native() && !access_flags.is_abstract(),
2441                         "Code attribute in native or abstract methods in class file %s",
2442                          CHECK_NULL);
2443       }
2444       if (parsed_code_attribute) {
2445         classfile_parse_error("Multiple Code attributes in class file %s",
2446                               CHECK_NULL);
2447       }
2448       parsed_code_attribute = true;
2449 
2450       // Stack size, locals size, and code size
2451       cfs->guarantee_more(8, CHECK_NULL);
2452       max_stack = cfs->get_u2_fast();
2453       max_locals = cfs->get_u2_fast();
2454       code_length = cfs->get_u4_fast();
2455       if (_need_verify) {
2456         guarantee_property(args_size <= max_locals,
2457                            "Arguments can't fit into locals in class file %s",
2458                            CHECK_NULL);
2459         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2460                            "Invalid method Code length %u in class file %s",
2461                            code_length, CHECK_NULL);
2462       }
2463       // Code pointer
2464       code_start = cfs->current();
2465       assert(code_start != NULL, "null code start");
2466       cfs->guarantee_more(code_length, CHECK_NULL);
2467       cfs->skip_u1_fast(code_length);
2468 
2469       // Exception handler table
2470       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2471       exception_table_length = cfs->get_u2_fast();
2472       if (exception_table_length > 0) {
2473         exception_table_start = parse_exception_table(cfs,
2474                                                       code_length,
2475                                                       exception_table_length,
2476                                                       CHECK_NULL);
2477       }
2478 
2479       // Parse additional attributes in code attribute
2480       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2481       u2 code_attributes_count = cfs->get_u2_fast();
2482 
2483       unsigned int calculated_attribute_length = 0;
2484 
2485       calculated_attribute_length =
2486           sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2487       calculated_attribute_length +=
2488         code_length +
2489         sizeof(exception_table_length) +
2490         sizeof(code_attributes_count) +
2491         exception_table_length *
2492             ( sizeof(u2) +   // start_pc
2493               sizeof(u2) +   // end_pc
2494               sizeof(u2) +   // handler_pc
2495               sizeof(u2) );  // catch_type_index
2496 
2497       while (code_attributes_count--) {
2498         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2499         const u2 code_attribute_name_index = cfs->get_u2_fast();
2500         const u4 code_attribute_length = cfs->get_u4_fast();
2501         calculated_attribute_length += code_attribute_length +
2502                                        sizeof(code_attribute_name_index) +
2503                                        sizeof(code_attribute_length);
2504         check_property(valid_symbol_at(code_attribute_name_index),
2505                        "Invalid code attribute name index %u in class file %s",
2506                        code_attribute_name_index,
2507                        CHECK_NULL);
2508         if (LoadLineNumberTables &&
2509             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2510           // Parse and compress line number table
2511           parse_linenumber_table(code_attribute_length,
2512                                  code_length,
2513                                  &linenumber_table,
2514                                  CHECK_NULL);
2515 
2516         } else if (LoadLocalVariableTables &&
2517                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2518           // Parse local variable table
2519           if (!lvt_allocated) {
2520             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2521               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2522             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2523               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2524             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2525               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2526             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2527               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2528             lvt_allocated = true;
2529           }
2530           if (lvt_cnt == max_lvt_cnt) {
2531             max_lvt_cnt <<= 1;
2532             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2533             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2534           }
2535           localvariable_table_start[lvt_cnt] =
2536             parse_localvariable_table(cfs,
2537                                       code_length,
2538                                       max_locals,
2539                                       code_attribute_length,
2540                                       &localvariable_table_length[lvt_cnt],
2541                                       false,    // is not LVTT
2542                                       CHECK_NULL);
2543           total_lvt_length += localvariable_table_length[lvt_cnt];
2544           lvt_cnt++;
2545         } else if (LoadLocalVariableTypeTables &&
2546                    _major_version >= JAVA_1_5_VERSION &&
2547                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2548           if (!lvt_allocated) {
2549             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2550               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2551             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2552               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2553             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2554               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2555             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2556               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2557             lvt_allocated = true;
2558           }
2559           // Parse local variable type table
2560           if (lvtt_cnt == max_lvtt_cnt) {
2561             max_lvtt_cnt <<= 1;
2562             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2563             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2564           }
2565           localvariable_type_table_start[lvtt_cnt] =
2566             parse_localvariable_table(cfs,
2567                                       code_length,
2568                                       max_locals,
2569                                       code_attribute_length,
2570                                       &localvariable_type_table_length[lvtt_cnt],
2571                                       true,     // is LVTT
2572                                       CHECK_NULL);
2573           lvtt_cnt++;
2574         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2575                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2576           // Stack map is only needed by the new verifier in JDK1.5.
2577           if (parsed_stackmap_attribute) {
2578             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2579           }
2580           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2581           stackmap_data_length = code_attribute_length;
2582           parsed_stackmap_attribute = true;
2583         } else {
2584           // Skip unknown attributes
2585           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2586         }
2587       }
2588       // check method attribute length
2589       if (_need_verify) {
2590         guarantee_property(method_attribute_length == calculated_attribute_length,
2591                            "Code segment has wrong length in class file %s",
2592                            CHECK_NULL);
2593       }
2594     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2595       // Parse Exceptions attribute
2596       if (parsed_checked_exceptions_attribute) {
2597         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2598                               CHECK_NULL);
2599       }
2600       parsed_checked_exceptions_attribute = true;
2601       checked_exceptions_start =
2602             parse_checked_exceptions(cfs,
2603                                      &checked_exceptions_length,
2604                                      method_attribute_length,
2605                                      CHECK_NULL);
2606     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2607       // reject multiple method parameters
2608       if (method_parameters_seen) {
2609         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2610                               CHECK_NULL);
2611       }
2612       method_parameters_seen = true;
2613       method_parameters_length = cfs->get_u1_fast();
2614       const u2 real_length = (method_parameters_length * 4u) + 1u;
2615       if (method_attribute_length != real_length) {
2616         classfile_parse_error(
2617           "Invalid MethodParameters method attribute length %u in class file",
2618           method_attribute_length, CHECK_NULL);
2619       }
2620       method_parameters_data = cfs->current();
2621       cfs->skip_u2_fast(method_parameters_length);
2622       cfs->skip_u2_fast(method_parameters_length);
2623       // ignore this attribute if it cannot be reflected
2624       if (!SystemDictionary::Parameter_klass_loaded())
2625         method_parameters_length = -1;
2626     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2627       if (method_attribute_length != 0) {
2628         classfile_parse_error(
2629           "Invalid Synthetic method attribute length %u in class file %s",
2630           method_attribute_length, CHECK_NULL);
2631       }
2632       // Should we check that there hasn't already been a synthetic attribute?
2633       access_flags.set_is_synthetic();
2634     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2635       if (method_attribute_length != 0) {
2636         classfile_parse_error(
2637           "Invalid Deprecated method attribute length %u in class file %s",
2638           method_attribute_length, CHECK_NULL);
2639       }
2640     } else if (_major_version >= JAVA_1_5_VERSION) {
2641       if (method_attribute_name == vmSymbols::tag_signature()) {
2642         if (generic_signature_index != 0) {
2643           classfile_parse_error(
2644             "Multiple Signature attributes for method in class file %s",
2645             CHECK_NULL);
2646         }
2647         if (method_attribute_length != 2) {
2648           classfile_parse_error(
2649             "Invalid Signature attribute length %u in class file %s",
2650             method_attribute_length, CHECK_NULL);
2651         }
2652         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2653       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2654         if (runtime_visible_annotations != NULL) {
2655           classfile_parse_error(
2656             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2657             CHECK_NULL);
2658         }
2659         runtime_visible_annotations_length = method_attribute_length;
2660         runtime_visible_annotations = cfs->current();
2661         assert(runtime_visible_annotations != NULL, "null visible annotations");
2662         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2663         parse_annotations(cp,
2664                           runtime_visible_annotations,
2665                           runtime_visible_annotations_length,
2666                           &parsed_annotations,
2667                           _loader_data,
2668                           CHECK_NULL);
2669         cfs->skip_u1_fast(runtime_visible_annotations_length);
2670       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2671         if (runtime_invisible_annotations_exists) {
2672           classfile_parse_error(
2673             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2674             CHECK_NULL);
2675         }
2676         runtime_invisible_annotations_exists = true;
2677         if (PreserveAllAnnotations) {
2678           runtime_invisible_annotations_length = method_attribute_length;
2679           runtime_invisible_annotations = cfs->current();
2680           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2681         }
2682         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2683       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2684         if (runtime_visible_parameter_annotations != NULL) {
2685           classfile_parse_error(
2686             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2687             CHECK_NULL);
2688         }
2689         runtime_visible_parameter_annotations_length = method_attribute_length;
2690         runtime_visible_parameter_annotations = cfs->current();
2691         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2692         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2693       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2694         if (runtime_invisible_parameter_annotations_exists) {
2695           classfile_parse_error(
2696             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2697             CHECK_NULL);
2698         }
2699         runtime_invisible_parameter_annotations_exists = true;
2700         if (PreserveAllAnnotations) {
2701           runtime_invisible_parameter_annotations_length = method_attribute_length;
2702           runtime_invisible_parameter_annotations = cfs->current();
2703           assert(runtime_invisible_parameter_annotations != NULL,
2704             "null invisible parameter annotations");
2705         }
2706         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2707       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2708         if (annotation_default != NULL) {
2709           classfile_parse_error(
2710             "Multiple AnnotationDefault attributes for method in class file %s",
2711             CHECK_NULL);
2712         }
2713         annotation_default_length = method_attribute_length;
2714         annotation_default = cfs->current();
2715         assert(annotation_default != NULL, "null annotation default");
2716         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2717       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2718         if (runtime_visible_type_annotations != NULL) {
2719           classfile_parse_error(
2720             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2721             CHECK_NULL);
2722         }
2723         runtime_visible_type_annotations_length = method_attribute_length;
2724         runtime_visible_type_annotations = cfs->current();
2725         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2726         // No need for the VM to parse Type annotations
2727         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2728       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2729         if (runtime_invisible_type_annotations_exists) {
2730           classfile_parse_error(
2731             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2732             CHECK_NULL);
2733         } else {
2734           runtime_invisible_type_annotations_exists = true;
2735         }
2736         if (PreserveAllAnnotations) {
2737           runtime_invisible_type_annotations_length = method_attribute_length;
2738           runtime_invisible_type_annotations = cfs->current();
2739           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2740         }
2741         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2742       } else {
2743         // Skip unknown attributes
2744         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2745       }
2746     } else {
2747       // Skip unknown attributes
2748       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2749     }
2750   }
2751 
2752   if (linenumber_table != NULL) {
2753     linenumber_table->write_terminator();
2754     linenumber_table_length = linenumber_table->position();
2755   }
2756 
2757   // Make sure there's at least one Code attribute in non-native/non-abstract method
2758   if (_need_verify) {
2759     guarantee_property(access_flags.is_native() ||
2760                        access_flags.is_abstract() ||
2761                        parsed_code_attribute,
2762                        "Absent Code attribute in method that is not native or abstract in class file %s",
2763                        CHECK_NULL);
2764   }
2765 
2766   // All sizing information for a Method* is finally available, now create it
2767   InlineTableSizes sizes(
2768       total_lvt_length,
2769       linenumber_table_length,
2770       exception_table_length,
2771       checked_exceptions_length,
2772       method_parameters_length,
2773       generic_signature_index,
2774       runtime_visible_annotations_length +
2775            runtime_invisible_annotations_length,
2776       runtime_visible_parameter_annotations_length +
2777            runtime_invisible_parameter_annotations_length,
2778       runtime_visible_type_annotations_length +
2779            runtime_invisible_type_annotations_length,
2780       annotation_default_length,
2781       0);
2782 
2783   Method* const m = Method::allocate(_loader_data,
2784                                      code_length,
2785                                      access_flags,
2786                                      &sizes,
2787                                      ConstMethod::NORMAL,
2788                                      CHECK_NULL);
2789 
2790   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2791 
2792   // Fill in information from fixed part (access_flags already set)
2793   m->set_constants(_cp);
2794   m->set_name_index(name_index);
2795   m->set_signature_index(signature_index);
2796   m->compute_from_signature(cp->symbol_at(signature_index));
2797   assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2798 
2799   // Fill in code attribute information
2800   m->set_max_stack(max_stack);
2801   m->set_max_locals(max_locals);
2802   if (stackmap_data != NULL) {
2803     m->constMethod()->copy_stackmap_data(_loader_data,
2804                                          (u1*)stackmap_data,
2805                                          stackmap_data_length,
2806                                          CHECK_NULL);
2807   }
2808 
2809   // Copy byte codes
2810   m->set_code((u1*)code_start);
2811 
2812   // Copy line number table
2813   if (linenumber_table != NULL) {
2814     memcpy(m->compressed_linenumber_table(),
2815            linenumber_table->buffer(),
2816            linenumber_table_length);
2817   }
2818 
2819   // Copy exception table
2820   if (exception_table_length > 0) {
2821     Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2822                                                 m->exception_table_start(),
2823                                                 exception_table_length * sizeof(ExceptionTableElement),
2824                                                 sizeof(u2));
2825   }
2826 
2827   // Copy method parameters
2828   if (method_parameters_length > 0) {
2829     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2830     for (int i = 0; i < method_parameters_length; i++) {
2831       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2832       method_parameters_data += 2;
2833       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2834       method_parameters_data += 2;
2835     }
2836   }
2837 
2838   // Copy checked exceptions
2839   if (checked_exceptions_length > 0) {
2840     Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2841                                                 m->checked_exceptions_start(),
2842                                                 checked_exceptions_length * sizeof(CheckedExceptionElement),
2843                                                 sizeof(u2));
2844   }
2845 
2846   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2847   if (total_lvt_length > 0) {
2848     promoted_flags->set_has_localvariable_table();
2849     copy_localvariable_table(m->constMethod(),
2850                              lvt_cnt,
2851                              localvariable_table_length,
2852                              localvariable_table_start,
2853                              lvtt_cnt,
2854                              localvariable_type_table_length,
2855                              localvariable_type_table_start,
2856                              CHECK_NULL);
2857   }
2858 
2859   if (parsed_annotations.has_any_annotations())
2860     parsed_annotations.apply_to(methodHandle(THREAD, m));
2861 
2862   // Copy annotations
2863   copy_method_annotations(m->constMethod(),
2864                           runtime_visible_annotations,
2865                           runtime_visible_annotations_length,
2866                           runtime_invisible_annotations,
2867                           runtime_invisible_annotations_length,
2868                           runtime_visible_parameter_annotations,
2869                           runtime_visible_parameter_annotations_length,
2870                           runtime_invisible_parameter_annotations,
2871                           runtime_invisible_parameter_annotations_length,
2872                           runtime_visible_type_annotations,
2873                           runtime_visible_type_annotations_length,
2874                           runtime_invisible_type_annotations,
2875                           runtime_invisible_type_annotations_length,
2876                           annotation_default,
2877                           annotation_default_length,
2878                           CHECK_NULL);
2879 
2880   if (name == vmSymbols::finalize_method_name() &&
2881       signature == vmSymbols::void_method_signature()) {
2882     if (m->is_empty_method()) {
2883       _has_empty_finalizer = true;
2884     } else {
2885       _has_finalizer = true;
2886     }
2887   }
2888   if (name == vmSymbols::object_initializer_name() &&
2889       signature == vmSymbols::void_method_signature() &&
2890       m->is_vanilla_constructor()) {
2891     _has_vanilla_constructor = true;
2892   }
2893 
2894   NOT_PRODUCT(m->verify());
2895   return m;
2896 }
2897 
2898 
2899 // The promoted_flags parameter is used to pass relevant access_flags
2900 // from the methods back up to the containing klass. These flag values
2901 // are added to klass's access_flags.
2902 // Side-effects: populates the _methods field in the parser
2903 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2904                                     bool is_interface,
2905                                     AccessFlags* promoted_flags,
2906                                     bool* has_final_method,
2907                                     bool* declares_nonstatic_concrete_methods,
2908                                     TRAPS) {
2909   assert(cfs != NULL, "invariant");
2910   assert(promoted_flags != NULL, "invariant");
2911   assert(has_final_method != NULL, "invariant");
2912   assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2913 
2914   assert(NULL == _methods, "invariant");
2915 
2916   cfs->guarantee_more(2, CHECK);  // length
2917   const u2 length = cfs->get_u2_fast();
2918   if (length == 0) {
2919     _methods = Universe::the_empty_method_array();
2920   } else {
2921     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2922                                                    length,
2923                                                    NULL,
2924                                                    CHECK);
2925 
2926     for (int index = 0; index < length; index++) {
2927       Method* method = parse_method(cfs,
2928                                     is_interface,
2929                                     _cp,
2930                                     promoted_flags,
2931                                     CHECK);
2932 
2933       if (method->is_final()) {
2934         *has_final_method = true;
2935       }
2936       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2937       // used for interface initialization, and default method inheritance analysis
2938       if (is_interface && !(*declares_nonstatic_concrete_methods)
2939         && !method->is_abstract() && !method->is_static()) {
2940         *declares_nonstatic_concrete_methods = true;
2941       }
2942       _methods->at_put(index, method);
2943     }
2944 
2945     if (_need_verify && length > 1) {
2946       // Check duplicated methods
2947       ResourceMark rm(THREAD);
2948       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2949         THREAD, NameSigHash*, HASH_ROW_SIZE);
2950       initialize_hashtable(names_and_sigs);
2951       bool dup = false;
2952       const Symbol* name = NULL;
2953       const Symbol* sig = NULL;
2954       {
2955         debug_only(NoSafepointVerifier nsv;)
2956         for (int i = 0; i < length; i++) {
2957           const Method* const m = _methods->at(i);
2958           name = m->name();
2959           sig = m->signature();
2960           // If no duplicates, add name/signature in hashtable names_and_sigs.
2961           if (!put_after_lookup(name, sig, names_and_sigs)) {
2962             dup = true;
2963             break;
2964           }
2965         }
2966       }
2967       if (dup) {
2968         classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2969                                name->as_C_string(), sig->as_klass_external_name(), CHECK);
2970       }
2971     }
2972   }
2973 }
2974 
2975 static const intArray* sort_methods(Array<Method*>* methods) {
2976   const int length = methods->length();
2977   // If JVMTI original method ordering or sharing is enabled we have to
2978   // remember the original class file ordering.
2979   // We temporarily use the vtable_index field in the Method* to store the
2980   // class file index, so we can read in after calling qsort.
2981   // Put the method ordering in the shared archive.
2982   if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2983     for (int index = 0; index < length; index++) {
2984       Method* const m = methods->at(index);
2985       assert(!m->valid_vtable_index(), "vtable index should not be set");
2986       m->set_vtable_index(index);
2987     }
2988   }
2989   // Sort method array by ascending method name (for faster lookups & vtable construction)
2990   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2991   Method::sort_methods(methods);
2992 
2993   intArray* method_ordering = NULL;
2994   // If JVMTI original method ordering or sharing is enabled construct int
2995   // array remembering the original ordering
2996   if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) {
2997     method_ordering = new intArray(length, length, -1);
2998     for (int index = 0; index < length; index++) {
2999       Method* const m = methods->at(index);
3000       const int old_index = m->vtable_index();
3001       assert(old_index >= 0 && old_index < length, "invalid method index");
3002       method_ordering->at_put(index, old_index);
3003       m->set_vtable_index(Method::invalid_vtable_index);
3004     }
3005   }
3006   return method_ordering;
3007 }
3008 
3009 // Parse generic_signature attribute for methods and fields
3010 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
3011                                                       TRAPS) {
3012   assert(cfs != NULL, "invariant");
3013 
3014   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
3015   const u2 generic_signature_index = cfs->get_u2_fast();
3016   check_property(
3017     valid_symbol_at(generic_signature_index),
3018     "Invalid Signature attribute at constant pool index %u in class file %s",
3019     generic_signature_index, CHECK_0);
3020   return generic_signature_index;
3021 }
3022 
3023 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
3024                                                            TRAPS) {
3025 
3026   assert(cfs != NULL, "invariant");
3027 
3028   cfs->guarantee_more(2, CHECK);  // sourcefile_index
3029   const u2 sourcefile_index = cfs->get_u2_fast();
3030   check_property(
3031     valid_symbol_at(sourcefile_index),
3032     "Invalid SourceFile attribute at constant pool index %u in class file %s",
3033     sourcefile_index, CHECK);
3034   set_class_sourcefile_index(sourcefile_index);
3035 }
3036 
3037 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
3038                                                                        int length,
3039                                                                        TRAPS) {
3040   assert(cfs != NULL, "invariant");
3041 
3042   const u1* const sde_buffer = cfs->current();
3043   assert(sde_buffer != NULL, "null sde buffer");
3044 
3045   // Don't bother storing it if there is no way to retrieve it
3046   if (JvmtiExport::can_get_source_debug_extension()) {
3047     assert((length+1) > length, "Overflow checking");
3048     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
3049     for (int i = 0; i < length; i++) {
3050       sde[i] = sde_buffer[i];
3051     }
3052     sde[length] = '\0';
3053     set_class_sde_buffer((const char*)sde, length);
3054   }
3055   // Got utf8 string, set stream position forward
3056   cfs->skip_u1(length, CHECK);
3057 }
3058 
3059 
3060 // Inner classes can be static, private or protected (classic VM does this)
3061 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
3062                                            JVM_ACC_PRIVATE |                \
3063                                            JVM_ACC_PROTECTED |              \
3064                                            JVM_ACC_STATIC                   \
3065                                          )
3066 
3067 // Return number of classes in the inner classes attribute table
3068 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3069                                                             const u1* const inner_classes_attribute_start,
3070                                                             bool parsed_enclosingmethod_attribute,
3071                                                             u2 enclosing_method_class_index,
3072                                                             u2 enclosing_method_method_index,
3073                                                             TRAPS) {
3074   const u1* const current_mark = cfs->current();
3075   u2 length = 0;
3076   if (inner_classes_attribute_start != NULL) {
3077     cfs->set_current(inner_classes_attribute_start);
3078     cfs->guarantee_more(2, CHECK_0);  // length
3079     length = cfs->get_u2_fast();
3080   }
3081 
3082   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3083   // method data:
3084   //   [inner_class_info_index,
3085   //    outer_class_info_index,
3086   //    inner_name_index,
3087   //    inner_class_access_flags,
3088   //    ...
3089   //    enclosing_method_class_index,
3090   //    enclosing_method_method_index]
3091   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3092   Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3093   _inner_classes = inner_classes;
3094 
3095   int index = 0;
3096   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
3097   for (int n = 0; n < length; n++) {
3098     // Inner class index
3099     const u2 inner_class_info_index = cfs->get_u2_fast();
3100     check_property(
3101       valid_klass_reference_at(inner_class_info_index),
3102       "inner_class_info_index %u has bad constant type in class file %s",
3103       inner_class_info_index, CHECK_0);
3104     // Outer class index
3105     const u2 outer_class_info_index = cfs->get_u2_fast();
3106     check_property(
3107       outer_class_info_index == 0 ||
3108         valid_klass_reference_at(outer_class_info_index),
3109       "outer_class_info_index %u has bad constant type in class file %s",
3110       outer_class_info_index, CHECK_0);
3111     // Inner class name
3112     const u2 inner_name_index = cfs->get_u2_fast();
3113     check_property(
3114       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3115       "inner_name_index %u has bad constant type in class file %s",
3116       inner_name_index, CHECK_0);
3117     if (_need_verify) {
3118       guarantee_property(inner_class_info_index != outer_class_info_index,
3119                          "Class is both outer and inner class in class file %s", CHECK_0);
3120     }
3121     // Access flags
3122     jint flags;
3123     // JVM_ACC_MODULE is defined in JDK-9 and later.
3124     if (_major_version >= JAVA_9_VERSION) {
3125       flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3126     } else {
3127       flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3128     }
3129     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3130       // Set abstract bit for old class files for backward compatibility
3131       flags |= JVM_ACC_ABSTRACT;
3132     }
3133     verify_legal_class_modifiers(flags, CHECK_0);
3134     AccessFlags inner_access_flags(flags);
3135 
3136     inner_classes->at_put(index++, inner_class_info_index);
3137     inner_classes->at_put(index++, outer_class_info_index);
3138     inner_classes->at_put(index++, inner_name_index);
3139     inner_classes->at_put(index++, inner_access_flags.as_short());
3140   }
3141 
3142   // 4347400: make sure there's no duplicate entry in the classes array
3143   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3144     for(int i = 0; i < length * 4; i += 4) {
3145       for(int j = i + 4; j < length * 4; j += 4) {
3146         guarantee_property((inner_classes->at(i)   != inner_classes->at(j) ||
3147                             inner_classes->at(i+1) != inner_classes->at(j+1) ||
3148                             inner_classes->at(i+2) != inner_classes->at(j+2) ||
3149                             inner_classes->at(i+3) != inner_classes->at(j+3)),
3150                             "Duplicate entry in InnerClasses in class file %s",
3151                             CHECK_0);
3152       }
3153     }
3154   }
3155 
3156   // Set EnclosingMethod class and method indexes.
3157   if (parsed_enclosingmethod_attribute) {
3158     inner_classes->at_put(index++, enclosing_method_class_index);
3159     inner_classes->at_put(index++, enclosing_method_method_index);
3160   }
3161   assert(index == size, "wrong size");
3162 
3163   // Restore buffer's current position.
3164   cfs->set_current(current_mark);
3165 
3166   return length;
3167 }
3168 
3169 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3170                                                            const u1* const nest_members_attribute_start,
3171                                                            TRAPS) {
3172   const u1* const current_mark = cfs->current();
3173   u2 length = 0;
3174   if (nest_members_attribute_start != NULL) {
3175     cfs->set_current(nest_members_attribute_start);
3176     cfs->guarantee_more(2, CHECK_0);  // length
3177     length = cfs->get_u2_fast();
3178   }
3179   const int size = length;
3180   Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3181   _nest_members = nest_members;
3182 
3183   int index = 0;
3184   cfs->guarantee_more(2 * length, CHECK_0);
3185   for (int n = 0; n < length; n++) {
3186     const u2 class_info_index = cfs->get_u2_fast();
3187     check_property(
3188       valid_klass_reference_at(class_info_index),
3189       "Nest member class_info_index %u has bad constant type in class file %s",
3190       class_info_index, CHECK_0);
3191     nest_members->at_put(index++, class_info_index);
3192   }
3193   assert(index == size, "wrong size");
3194 
3195   // Restore buffer's current position.
3196   cfs->set_current(current_mark);
3197 
3198   return length;
3199 }
3200 
3201 //  Record {
3202 //    u2 attribute_name_index;
3203 //    u4 attribute_length;
3204 //    u2 components_count;
3205 //    component_info components[components_count];
3206 //  }
3207 //  component_info {
3208 //    u2 name_index;
3209 //    u2 descriptor_index
3210 //    u2 attributes_count;
3211 //    attribute_info_attributes[attributes_count];
3212 //  }
3213 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3214                                                      const ConstantPool* cp,
3215                                                      const u1* const record_attribute_start,
3216                                                      TRAPS) {
3217   const u1* const current_mark = cfs->current();
3218   int components_count = 0;
3219   unsigned int calculate_attr_size = 0;
3220   if (record_attribute_start != NULL) {
3221     cfs->set_current(record_attribute_start);
3222     cfs->guarantee_more(2, CHECK_0);  // num of components
3223     components_count = (int)cfs->get_u2_fast();
3224     calculate_attr_size = 2;
3225   }
3226 
3227   Array<RecordComponent*>* const record_components =
3228     MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0);
3229   _record_components = record_components;
3230 
3231   for (int x = 0; x < components_count; x++) {
3232     cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3233 
3234     const u2 name_index = cfs->get_u2_fast();
3235     check_property(valid_symbol_at(name_index),
3236       "Invalid constant pool index %u for name in Record attribute in class file %s",
3237       name_index, CHECK_0);
3238     const Symbol* const name = cp->symbol_at(name_index);
3239     verify_legal_field_name(name, CHECK_0);
3240 
3241     const u2 descriptor_index = cfs->get_u2_fast();
3242     check_property(valid_symbol_at(descriptor_index),
3243       "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3244       descriptor_index, CHECK_0);
3245     const Symbol* const descr = cp->symbol_at(descriptor_index);
3246     verify_legal_field_signature(name, descr, CHECK_0);
3247 
3248     const u2 attributes_count = cfs->get_u2_fast();
3249     calculate_attr_size += 6;
3250     u2 generic_sig_index = 0;
3251     const u1* runtime_visible_annotations = NULL;
3252     int runtime_visible_annotations_length = 0;
3253     const u1* runtime_invisible_annotations = NULL;
3254     int runtime_invisible_annotations_length = 0;
3255     bool runtime_invisible_annotations_exists = false;
3256     const u1* runtime_visible_type_annotations = NULL;
3257     int runtime_visible_type_annotations_length = 0;
3258     const u1* runtime_invisible_type_annotations = NULL;
3259     int runtime_invisible_type_annotations_length = 0;
3260     bool runtime_invisible_type_annotations_exists = false;
3261 
3262     // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3263     // and Runtime(In)VisibleTypeAnnotations.  Other attributes are ignored.
3264     for (int y = 0; y < attributes_count; y++) {
3265       cfs->guarantee_more(6, CHECK_0);  // attribute_name_index, attribute_length
3266       const u2 attribute_name_index = cfs->get_u2_fast();
3267       const u4 attribute_length = cfs->get_u4_fast();
3268       calculate_attr_size += 6;
3269       check_property(
3270         valid_symbol_at(attribute_name_index),
3271         "Invalid Record attribute name index %u in class file %s",
3272         attribute_name_index, CHECK_0);
3273 
3274       const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3275       if (attribute_name == vmSymbols::tag_signature()) {
3276         if (generic_sig_index != 0) {
3277           classfile_parse_error(
3278             "Multiple Signature attributes for Record component in class file %s",
3279             CHECK_0);
3280         }
3281         if (attribute_length != 2) {
3282           classfile_parse_error(
3283             "Invalid Signature attribute length %u in Record component in class file %s",
3284             attribute_length, CHECK_0);
3285         }
3286         generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3287 
3288       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3289         if (runtime_visible_annotations != NULL) {
3290           classfile_parse_error(
3291             "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3292         }
3293         runtime_visible_annotations_length = attribute_length;
3294         runtime_visible_annotations = cfs->current();
3295 
3296         assert(runtime_visible_annotations != NULL, "null record component visible annotation");
3297         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3298         cfs->skip_u1_fast(runtime_visible_annotations_length);
3299 
3300       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3301         if (runtime_invisible_annotations_exists) {
3302           classfile_parse_error(
3303             "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0);
3304         }
3305         runtime_invisible_annotations_exists = true;
3306         if (PreserveAllAnnotations) {
3307           runtime_invisible_annotations_length = attribute_length;
3308           runtime_invisible_annotations = cfs->current();
3309           assert(runtime_invisible_annotations != NULL, "null record component invisible annotation");
3310         }
3311         cfs->skip_u1(attribute_length, CHECK_0);
3312 
3313       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3314         if (runtime_visible_type_annotations != NULL) {
3315           classfile_parse_error(
3316             "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3317         }
3318         runtime_visible_type_annotations_length = attribute_length;
3319         runtime_visible_type_annotations = cfs->current();
3320 
3321         assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation");
3322         cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3323         cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3324 
3325       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3326         if (runtime_invisible_type_annotations_exists) {
3327           classfile_parse_error(
3328             "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0);
3329         }
3330         runtime_invisible_type_annotations_exists = true;
3331         if (PreserveAllAnnotations) {
3332           runtime_invisible_type_annotations_length = attribute_length;
3333           runtime_invisible_type_annotations = cfs->current();
3334           assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation");
3335         }
3336         cfs->skip_u1(attribute_length, CHECK_0);
3337 
3338       } else {
3339         // Skip unknown attributes
3340         cfs->skip_u1(attribute_length, CHECK_0);
3341       }
3342       calculate_attr_size += attribute_length;
3343     } // End of attributes For loop
3344 
3345     AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3346                                                         runtime_visible_annotations_length,
3347                                                         runtime_invisible_annotations,
3348                                                         runtime_invisible_annotations_length,
3349                                                         CHECK_0);
3350     AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3351                                                              runtime_visible_type_annotations_length,
3352                                                              runtime_invisible_type_annotations,
3353                                                              runtime_invisible_type_annotations_length,
3354                                                              CHECK_0);
3355 
3356     RecordComponent* record_component =
3357       RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3358                                 attributes_count, generic_sig_index,
3359                                 annotations, type_annotations, CHECK_0);
3360     record_components->at_put(x, record_component);
3361   }  // End of component processing loop
3362 
3363   // Restore buffer's current position.
3364   cfs->set_current(current_mark);
3365   return calculate_attr_size;
3366 }
3367 
3368 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3369   set_class_synthetic_flag(true);
3370 }
3371 
3372 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3373   assert(cfs != NULL, "invariant");
3374 
3375   const u2 signature_index = cfs->get_u2(CHECK);
3376   check_property(
3377     valid_symbol_at(signature_index),
3378     "Invalid constant pool index %u in Signature attribute in class file %s",
3379     signature_index, CHECK);
3380   set_class_generic_signature_index(signature_index);
3381 }
3382 
3383 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3384                                                                   ConstantPool* cp,
3385                                                                   u4 attribute_byte_length,
3386                                                                   TRAPS) {
3387   assert(cfs != NULL, "invariant");
3388   assert(cp != NULL, "invariant");
3389 
3390   const u1* const current_start = cfs->current();
3391 
3392   guarantee_property(attribute_byte_length >= sizeof(u2),
3393                      "Invalid BootstrapMethods attribute length %u in class file %s",
3394                      attribute_byte_length,
3395                      CHECK);
3396 
3397   cfs->guarantee_more(attribute_byte_length, CHECK);
3398 
3399   const int attribute_array_length = cfs->get_u2_fast();
3400 
3401   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3402                      "Short length on BootstrapMethods in class file %s",
3403                      CHECK);
3404 
3405 
3406   // The attribute contains a counted array of counted tuples of shorts,
3407   // represending bootstrap specifiers:
3408   //    length*{bootstrap_method_index, argument_count*{argument_index}}
3409   const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3410   // operand_count = number of shorts in attr, except for leading length
3411 
3412   // The attribute is copied into a short[] array.
3413   // The array begins with a series of short[2] pairs, one for each tuple.
3414   const int index_size = (attribute_array_length * 2);
3415 
3416   Array<u2>* const operands =
3417     MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3418 
3419   // Eagerly assign operands so they will be deallocated with the constant
3420   // pool if there is an error.
3421   cp->set_operands(operands);
3422 
3423   int operand_fill_index = index_size;
3424   const int cp_size = cp->length();
3425 
3426   for (int n = 0; n < attribute_array_length; n++) {
3427     // Store a 32-bit offset into the header of the operand array.
3428     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3429 
3430     // Read a bootstrap specifier.
3431     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3432     const u2 bootstrap_method_index = cfs->get_u2_fast();
3433     const u2 argument_count = cfs->get_u2_fast();
3434     check_property(
3435       valid_cp_range(bootstrap_method_index, cp_size) &&
3436       cp->tag_at(bootstrap_method_index).is_method_handle(),
3437       "bootstrap_method_index %u has bad constant type in class file %s",
3438       bootstrap_method_index,
3439       CHECK);
3440 
3441     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3442       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3443       CHECK);
3444 
3445     operands->at_put(operand_fill_index++, bootstrap_method_index);
3446     operands->at_put(operand_fill_index++, argument_count);
3447 
3448     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
3449     for (int j = 0; j < argument_count; j++) {
3450       const u2 argument_index = cfs->get_u2_fast();
3451       check_property(
3452         valid_cp_range(argument_index, cp_size) &&
3453         cp->tag_at(argument_index).is_loadable_constant(),
3454         "argument_index %u has bad constant type in class file %s",
3455         argument_index,
3456         CHECK);
3457       operands->at_put(operand_fill_index++, argument_index);
3458     }
3459   }
3460   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3461                      "Bad length on BootstrapMethods in class file %s",
3462                      CHECK);
3463 }
3464 
3465 bool ClassFileParser::supports_records() {
3466   return _major_version == JVM_CLASSFILE_MAJOR_VERSION &&
3467     _minor_version == JAVA_PREVIEW_MINOR_VERSION &&
3468     Arguments::enable_preview();
3469 }
3470 
3471 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3472                                                  ConstantPool* cp,
3473                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3474                                                  TRAPS) {
3475   assert(cfs != NULL, "invariant");
3476   assert(cp != NULL, "invariant");
3477   assert(parsed_annotations != NULL, "invariant");
3478 
3479   // Set inner classes attribute to default sentinel
3480   _inner_classes = Universe::the_empty_short_array();
3481   // Set nest members attribute to default sentinel
3482   _nest_members = Universe::the_empty_short_array();
3483   cfs->guarantee_more(2, CHECK);  // attributes_count
3484   u2 attributes_count = cfs->get_u2_fast();
3485   bool parsed_sourcefile_attribute = false;
3486   bool parsed_innerclasses_attribute = false;
3487   bool parsed_nest_members_attribute = false;
3488   bool parsed_nest_host_attribute = false;
3489   bool parsed_record_attribute = false;
3490   bool parsed_enclosingmethod_attribute = false;
3491   bool parsed_bootstrap_methods_attribute = false;
3492   const u1* runtime_visible_annotations = NULL;
3493   int runtime_visible_annotations_length = 0;
3494   const u1* runtime_invisible_annotations = NULL;
3495   int runtime_invisible_annotations_length = 0;
3496   const u1* runtime_visible_type_annotations = NULL;
3497   int runtime_visible_type_annotations_length = 0;
3498   const u1* runtime_invisible_type_annotations = NULL;
3499   int runtime_invisible_type_annotations_length = 0;
3500   bool runtime_invisible_type_annotations_exists = false;
3501   bool runtime_invisible_annotations_exists = false;
3502   bool parsed_source_debug_ext_annotations_exist = false;
3503   const u1* inner_classes_attribute_start = NULL;
3504   u4  inner_classes_attribute_length = 0;
3505   u2  enclosing_method_class_index = 0;
3506   u2  enclosing_method_method_index = 0;
3507   const u1* nest_members_attribute_start = NULL;
3508   u4  nest_members_attribute_length = 0;
3509   const u1* record_attribute_start = NULL;
3510   u4  record_attribute_length = 0;
3511 
3512   // Iterate over attributes
3513   while (attributes_count--) {
3514     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3515     const u2 attribute_name_index = cfs->get_u2_fast();
3516     const u4 attribute_length = cfs->get_u4_fast();
3517     check_property(
3518       valid_symbol_at(attribute_name_index),
3519       "Attribute name has bad constant pool index %u in class file %s",
3520       attribute_name_index, CHECK);
3521     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3522     if (tag == vmSymbols::tag_source_file()) {
3523       // Check for SourceFile tag
3524       if (_need_verify) {
3525         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3526       }
3527       if (parsed_sourcefile_attribute) {
3528         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3529       } else {
3530         parsed_sourcefile_attribute = true;
3531       }
3532       parse_classfile_sourcefile_attribute(cfs, CHECK);
3533     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3534       // Check for SourceDebugExtension tag
3535       if (parsed_source_debug_ext_annotations_exist) {
3536           classfile_parse_error(
3537             "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3538       }
3539       parsed_source_debug_ext_annotations_exist = true;
3540       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3541     } else if (tag == vmSymbols::tag_inner_classes()) {
3542       // Check for InnerClasses tag
3543       if (parsed_innerclasses_attribute) {
3544         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3545       } else {
3546         parsed_innerclasses_attribute = true;
3547       }
3548       inner_classes_attribute_start = cfs->current();
3549       inner_classes_attribute_length = attribute_length;
3550       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3551     } else if (tag == vmSymbols::tag_synthetic()) {
3552       // Check for Synthetic tag
3553       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3554       if (attribute_length != 0) {
3555         classfile_parse_error(
3556           "Invalid Synthetic classfile attribute length %u in class file %s",
3557           attribute_length, CHECK);
3558       }
3559       parse_classfile_synthetic_attribute(CHECK);
3560     } else if (tag == vmSymbols::tag_deprecated()) {
3561       // Check for Deprecatd tag - 4276120
3562       if (attribute_length != 0) {
3563         classfile_parse_error(
3564           "Invalid Deprecated classfile attribute length %u in class file %s",
3565           attribute_length, CHECK);
3566       }
3567     } else if (_major_version >= JAVA_1_5_VERSION) {
3568       if (tag == vmSymbols::tag_signature()) {
3569         if (_generic_signature_index != 0) {
3570           classfile_parse_error(
3571             "Multiple Signature attributes in class file %s", CHECK);
3572         }
3573         if (attribute_length != 2) {
3574           classfile_parse_error(
3575             "Wrong Signature attribute length %u in class file %s",
3576             attribute_length, CHECK);
3577         }
3578         parse_classfile_signature_attribute(cfs, CHECK);
3579       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3580         if (runtime_visible_annotations != NULL) {
3581           classfile_parse_error(
3582             "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3583         }
3584         runtime_visible_annotations_length = attribute_length;
3585         runtime_visible_annotations = cfs->current();
3586         assert(runtime_visible_annotations != NULL, "null visible annotations");
3587         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3588         parse_annotations(cp,
3589                           runtime_visible_annotations,
3590                           runtime_visible_annotations_length,
3591                           parsed_annotations,
3592                           _loader_data,
3593                           CHECK);
3594         cfs->skip_u1_fast(runtime_visible_annotations_length);
3595       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3596         if (runtime_invisible_annotations_exists) {
3597           classfile_parse_error(
3598             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3599         }
3600         runtime_invisible_annotations_exists = true;
3601         if (PreserveAllAnnotations) {
3602           runtime_invisible_annotations_length = attribute_length;
3603           runtime_invisible_annotations = cfs->current();
3604           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3605         }
3606         cfs->skip_u1(attribute_length, CHECK);
3607       } else if (tag == vmSymbols::tag_enclosing_method()) {
3608         if (parsed_enclosingmethod_attribute) {
3609           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3610         } else {
3611           parsed_enclosingmethod_attribute = true;
3612         }
3613         guarantee_property(attribute_length == 4,
3614           "Wrong EnclosingMethod attribute length %u in class file %s",
3615           attribute_length, CHECK);
3616         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3617         enclosing_method_class_index  = cfs->get_u2_fast();
3618         enclosing_method_method_index = cfs->get_u2_fast();
3619         if (enclosing_method_class_index == 0) {
3620           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3621         }
3622         // Validate the constant pool indices and types
3623         check_property(valid_klass_reference_at(enclosing_method_class_index),
3624           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3625         if (enclosing_method_method_index != 0 &&
3626             (!cp->is_within_bounds(enclosing_method_method_index) ||
3627              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3628           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3629         }
3630       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3631                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3632         if (parsed_bootstrap_methods_attribute) {
3633           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3634         }
3635         parsed_bootstrap_methods_attribute = true;
3636         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3637       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3638         if (runtime_visible_type_annotations != NULL) {
3639           classfile_parse_error(
3640             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3641         }
3642         runtime_visible_type_annotations_length = attribute_length;
3643         runtime_visible_type_annotations = cfs->current();
3644         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3645         // No need for the VM to parse Type annotations
3646         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3647       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3648         if (runtime_invisible_type_annotations_exists) {
3649           classfile_parse_error(
3650             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3651         } else {
3652           runtime_invisible_type_annotations_exists = true;
3653         }
3654         if (PreserveAllAnnotations) {
3655           runtime_invisible_type_annotations_length = attribute_length;
3656           runtime_invisible_type_annotations = cfs->current();
3657           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3658         }
3659         cfs->skip_u1(attribute_length, CHECK);
3660       } else if (_major_version >= JAVA_11_VERSION) {
3661         if (tag == vmSymbols::tag_nest_members()) {
3662           // Check for NestMembers tag
3663           if (parsed_nest_members_attribute) {
3664             classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK);
3665           } else {
3666             parsed_nest_members_attribute = true;
3667           }
3668           if (parsed_nest_host_attribute) {
3669             classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK);
3670           }
3671           nest_members_attribute_start = cfs->current();
3672           nest_members_attribute_length = attribute_length;
3673           cfs->skip_u1(nest_members_attribute_length, CHECK);
3674         } else if (tag == vmSymbols::tag_nest_host()) {
3675           if (parsed_nest_host_attribute) {
3676             classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK);
3677           } else {
3678             parsed_nest_host_attribute = true;
3679           }
3680           if (parsed_nest_members_attribute) {
3681             classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK);
3682           }
3683           if (_need_verify) {
3684             guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3685           }
3686           cfs->guarantee_more(2, CHECK);
3687           u2 class_info_index = cfs->get_u2_fast();
3688           check_property(
3689                          valid_klass_reference_at(class_info_index),
3690                          "Nest-host class_info_index %u has bad constant type in class file %s",
3691                          class_info_index, CHECK);
3692           _nest_host = class_info_index;
3693         } else if (_major_version >= JAVA_14_VERSION) {
3694           if (tag == vmSymbols::tag_record()) {
3695             // Skip over Record attribute if not supported or if super class is
3696             // not java.lang.Record.
3697             if (supports_records() &&
3698                 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) {
3699               if (parsed_record_attribute) {
3700                 classfile_parse_error("Multiple Record attributes in class file %s", CHECK);
3701               }
3702               // Check that class is final and not abstract.
3703               if (!_access_flags.is_final() || _access_flags.is_abstract()) {
3704                 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK);
3705               }
3706               parsed_record_attribute = true;
3707               record_attribute_start = cfs->current();
3708               record_attribute_length = attribute_length;
3709             } else if (log_is_enabled(Info, class, record)) {
3710               // Log why the Record attribute was ignored.  Note that if the
3711               // class file version is JVM_CLASSFILE_MAJOR_VERSION.65535 and
3712               // --enable-preview wasn't specified then a java.lang.UnsupportedClassVersionError
3713               // exception would have been thrown.
3714               ResourceMark rm(THREAD);
3715               if (supports_records()) {
3716                 log_info(class, record)(
3717                   "Ignoring Record attribute in class %s because super type is not java.lang.Record",
3718                   _class_name->as_C_string());
3719               } else {
3720                 log_info(class, record)(
3721                   "Ignoring Record attribute in class %s because class file version is not %d.65535",
3722                    _class_name->as_C_string(), JVM_CLASSFILE_MAJOR_VERSION);
3723               }
3724             }
3725             cfs->skip_u1(attribute_length, CHECK);
3726           } else {
3727             // Unknown attribute
3728             cfs->skip_u1(attribute_length, CHECK);
3729           }
3730         } else {
3731           // Unknown attribute
3732           cfs->skip_u1(attribute_length, CHECK);
3733         }
3734       } else {
3735         // Unknown attribute
3736         cfs->skip_u1(attribute_length, CHECK);
3737       }
3738     } else {
3739       // Unknown attribute
3740       cfs->skip_u1(attribute_length, CHECK);
3741     }
3742   }
3743   _class_annotations = assemble_annotations(runtime_visible_annotations,
3744                                             runtime_visible_annotations_length,
3745                                             runtime_invisible_annotations,
3746                                             runtime_invisible_annotations_length,
3747                                             CHECK);
3748   _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3749                                                  runtime_visible_type_annotations_length,
3750                                                  runtime_invisible_type_annotations,
3751                                                  runtime_invisible_type_annotations_length,
3752                                                  CHECK);
3753 
3754   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3755     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3756                             cfs,
3757                             inner_classes_attribute_start,
3758                             parsed_innerclasses_attribute,
3759                             enclosing_method_class_index,
3760                             enclosing_method_method_index,
3761                             CHECK);
3762     if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3763       guarantee_property(
3764         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3765         "Wrong InnerClasses attribute length in class file %s", CHECK);
3766     }
3767   }
3768 
3769   if (parsed_nest_members_attribute) {
3770     const u2 num_of_classes = parse_classfile_nest_members_attribute(
3771                             cfs,
3772                             nest_members_attribute_start,
3773                             CHECK);
3774     if (_need_verify) {
3775       guarantee_property(
3776         nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3777         "Wrong NestMembers attribute length in class file %s", CHECK);
3778     }
3779   }
3780 
3781   if (parsed_record_attribute) {
3782     const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3783                             cfs,
3784                             cp,
3785                             record_attribute_start,
3786                             CHECK);
3787     if (_need_verify) {
3788       guarantee_property(record_attribute_length == calculated_attr_length,
3789                          "Record attribute has wrong length in class file %s",
3790                          CHECK);
3791     }
3792   }
3793 
3794   if (_max_bootstrap_specifier_index >= 0) {
3795     guarantee_property(parsed_bootstrap_methods_attribute,
3796                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3797   }
3798 }
3799 
3800 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3801   assert(k != NULL, "invariant");
3802 
3803   if (_synthetic_flag)
3804     k->set_is_synthetic();
3805   if (_sourcefile_index != 0) {
3806     k->set_source_file_name_index(_sourcefile_index);
3807   }
3808   if (_generic_signature_index != 0) {
3809     k->set_generic_signature_index(_generic_signature_index);
3810   }
3811   if (_sde_buffer != NULL) {
3812     k->set_source_debug_extension(_sde_buffer, _sde_length);
3813   }
3814 }
3815 
3816 // Create the Annotations object that will
3817 // hold the annotations array for the Klass.
3818 void ClassFileParser::create_combined_annotations(TRAPS) {
3819     if (_class_annotations == NULL &&
3820         _class_type_annotations == NULL &&
3821         _fields_annotations == NULL &&
3822         _fields_type_annotations == NULL) {
3823       // Don't create the Annotations object unnecessarily.
3824       return;
3825     }
3826 
3827     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3828     annotations->set_class_annotations(_class_annotations);
3829     annotations->set_class_type_annotations(_class_type_annotations);
3830     annotations->set_fields_annotations(_fields_annotations);
3831     annotations->set_fields_type_annotations(_fields_type_annotations);
3832 
3833     // This is the Annotations object that will be
3834     // assigned to InstanceKlass being constructed.
3835     _combined_annotations = annotations;
3836 
3837     // The annotations arrays below has been transfered the
3838     // _combined_annotations so these fields can now be cleared.
3839     _class_annotations       = NULL;
3840     _class_type_annotations  = NULL;
3841     _fields_annotations      = NULL;
3842     _fields_type_annotations = NULL;
3843 }
3844 
3845 // Transfer ownership of metadata allocated to the InstanceKlass.
3846 void ClassFileParser::apply_parsed_class_metadata(
3847                                             InstanceKlass* this_klass,
3848                                             int java_fields_count,
3849                                             TRAPS) {
3850   assert(this_klass != NULL, "invariant");
3851 
3852   _cp->set_pool_holder(this_klass);
3853   this_klass->set_constants(_cp);
3854   this_klass->set_fields(_fields, java_fields_count);
3855   this_klass->set_methods(_methods);
3856   this_klass->set_inner_classes(_inner_classes);
3857   this_klass->set_nest_members(_nest_members);
3858   this_klass->set_nest_host_index(_nest_host);
3859   this_klass->set_local_interfaces(_local_interfaces);
3860   this_klass->set_annotations(_combined_annotations);
3861   this_klass->set_record_components(_record_components);
3862   // Delay the setting of _transitive_interfaces until after initialize_supers() in
3863   // fill_instance_klass(). It is because the _transitive_interfaces may be shared with
3864   // its _super. If an OOM occurs while loading the current klass, its _super field
3865   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3866   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3867   // dereferences to the deallocated _transitive_interfaces will result in a crash.
3868 
3869   // Clear out these fields so they don't get deallocated by the destructor
3870   clear_class_metadata();
3871 }
3872 
3873 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3874                                                        int runtime_visible_annotations_length,
3875                                                        const u1* const runtime_invisible_annotations,
3876                                                        int runtime_invisible_annotations_length,
3877                                                        TRAPS) {
3878   AnnotationArray* annotations = NULL;
3879   if (runtime_visible_annotations != NULL ||
3880       runtime_invisible_annotations != NULL) {
3881     annotations = MetadataFactory::new_array<u1>(_loader_data,
3882                                           runtime_visible_annotations_length +
3883                                           runtime_invisible_annotations_length,
3884                                           CHECK_(annotations));
3885     if (runtime_visible_annotations != NULL) {
3886       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3887         annotations->at_put(i, runtime_visible_annotations[i]);
3888       }
3889     }
3890     if (runtime_invisible_annotations != NULL) {
3891       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3892         int append = runtime_visible_annotations_length+i;
3893         annotations->at_put(append, runtime_invisible_annotations[i]);
3894       }
3895     }
3896   }
3897   return annotations;
3898 }
3899 
3900 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3901                                                         const int super_class_index,
3902                                                         const bool need_verify,
3903                                                         TRAPS) {
3904   assert(cp != NULL, "invariant");
3905   const InstanceKlass* super_klass = NULL;
3906 
3907   if (super_class_index == 0) {
3908     check_property(_class_name == vmSymbols::java_lang_Object(),
3909                    "Invalid superclass index %u in class file %s",
3910                    super_class_index,
3911                    CHECK_NULL);
3912   } else {
3913     check_property(valid_klass_reference_at(super_class_index),
3914                    "Invalid superclass index %u in class file %s",
3915                    super_class_index,
3916                    CHECK_NULL);
3917     // The class name should be legal because it is checked when parsing constant pool.
3918     // However, make sure it is not an array type.
3919     bool is_array = false;
3920     if (cp->tag_at(super_class_index).is_klass()) {
3921       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3922       if (need_verify)
3923         is_array = super_klass->is_array_klass();
3924     } else if (need_verify) {
3925       is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3926     }
3927     if (need_verify) {
3928       guarantee_property(!is_array,
3929                         "Bad superclass name in class file %s", CHECK_NULL);
3930     }
3931   }
3932   return super_klass;
3933 }
3934 
3935 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3936                                           unsigned int nonstatic_oop_map_count,
3937                                           int first_nonstatic_oop_offset) {
3938 
3939   unsigned int map_count =
3940     NULL == super ? 0 : super->nonstatic_oop_map_count();
3941   if (nonstatic_oop_map_count > 0) {
3942     // We have oops to add to map
3943     if (map_count == 0) {
3944       map_count = nonstatic_oop_map_count;
3945     }
3946     else {
3947       // Check whether we should add a new map block or whether the last one can
3948       // be extended
3949       const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3950       const OopMapBlock* const last_map = first_map + map_count - 1;
3951 
3952       const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3953       if (next_offset == first_nonstatic_oop_offset) {
3954         // There is no gap bettwen superklass's last oop field and first
3955         // local oop field, merge maps.
3956         nonstatic_oop_map_count -= 1;
3957       }
3958       else {
3959         // Superklass didn't end with a oop field, add extra maps
3960         assert(next_offset < first_nonstatic_oop_offset, "just checking");
3961       }
3962       map_count += nonstatic_oop_map_count;
3963     }
3964   }
3965   return map_count;
3966 }
3967 
3968 #ifndef PRODUCT
3969 static void print_field_layout(const Symbol* name,
3970                                Array<u2>* fields,
3971                                ConstantPool* cp,
3972                                int instance_size,
3973                                int instance_fields_start,
3974                                int instance_fields_end,
3975                                int static_fields_end) {
3976 
3977   assert(name != NULL, "invariant");
3978 
3979   tty->print("%s: field layout\n", name->as_klass_external_name());
3980   tty->print("  @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3981   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3982     if (!fs.access_flags().is_static()) {
3983       tty->print("  @%3d \"%s\" %s\n",
3984         fs.offset(),
3985         fs.name()->as_klass_external_name(),
3986         fs.signature()->as_klass_external_name());
3987     }
3988   }
3989   tty->print("  @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3990   tty->print("  @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3991   tty->print("  @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3992   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3993     if (fs.access_flags().is_static()) {
3994       tty->print("  @%3d \"%s\" %s\n",
3995         fs.offset(),
3996         fs.name()->as_klass_external_name(),
3997         fs.signature()->as_klass_external_name());
3998     }
3999   }
4000   tty->print("  @%3d %s\n", static_fields_end, "--- static fields end ---");
4001   tty->print("\n");
4002 }
4003 #endif
4004 
4005 // Values needed for oopmap and InstanceKlass creation
4006 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
4007  public:
4008   int*          nonstatic_oop_offsets;
4009   unsigned int* nonstatic_oop_counts;
4010   unsigned int  nonstatic_oop_map_count;
4011   unsigned int  total_oop_map_count;
4012   int           instance_size;
4013   int           nonstatic_field_size;
4014   int           static_field_size;
4015   bool          has_nonstatic_fields;
4016 };
4017 
4018 // Layout fields and fill in FieldLayoutInfo.  Could use more refactoring!
4019 void ClassFileParser::layout_fields(ConstantPool* cp,
4020                                     const FieldAllocationCount* fac,
4021                                     const ClassAnnotationCollector* parsed_annotations,
4022                                     FieldLayoutInfo* info,
4023                                     TRAPS) {
4024 
4025   assert(cp != NULL, "invariant");
4026 
4027   // Field size and offset computation
4028   int nonstatic_field_size = _super_klass == NULL ? 0 :
4029                                _super_klass->nonstatic_field_size();
4030 
4031   // Count the contended fields by type.
4032   //
4033   // We ignore static fields, because @Contended is not supported for them.
4034   // The layout code below will also ignore the static fields.
4035   int nonstatic_contended_count = 0;
4036   FieldAllocationCount fac_contended;
4037   for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4038     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4039     if (fs.is_contended()) {
4040       fac_contended.count[atype]++;
4041       if (!fs.access_flags().is_static()) {
4042         nonstatic_contended_count++;
4043       }
4044     }
4045   }
4046 
4047 
4048   // Calculate the starting byte offsets
4049   int next_static_oop_offset    = InstanceMirrorKlass::offset_of_static_fields();
4050   int next_static_double_offset = next_static_oop_offset +
4051                                       ((fac->count[STATIC_OOP]) * heapOopSize);
4052   if (fac->count[STATIC_DOUBLE]) {
4053     next_static_double_offset = align_up(next_static_double_offset, BytesPerLong);
4054   }
4055 
4056   int next_static_word_offset   = next_static_double_offset +
4057                                     ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
4058   int next_static_short_offset  = next_static_word_offset +
4059                                     ((fac->count[STATIC_WORD]) * BytesPerInt);
4060   int next_static_byte_offset   = next_static_short_offset +
4061                                   ((fac->count[STATIC_SHORT]) * BytesPerShort);
4062 
4063   int nonstatic_fields_start  = instanceOopDesc::base_offset_in_bytes() +
4064                                 nonstatic_field_size * heapOopSize;
4065 
4066   int next_nonstatic_field_offset = nonstatic_fields_start;
4067 
4068   const bool is_contended_class     = parsed_annotations->is_contended();
4069 
4070   // Class is contended, pad before all the fields
4071   if (is_contended_class) {
4072     next_nonstatic_field_offset += ContendedPaddingWidth;
4073   }
4074 
4075   // Compute the non-contended fields count.
4076   // The packing code below relies on these counts to determine if some field
4077   // can be squeezed into the alignment gap. Contended fields are obviously
4078   // exempt from that.
4079   unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
4080   unsigned int nonstatic_word_count   = fac->count[NONSTATIC_WORD]   - fac_contended.count[NONSTATIC_WORD];
4081   unsigned int nonstatic_short_count  = fac->count[NONSTATIC_SHORT]  - fac_contended.count[NONSTATIC_SHORT];
4082   unsigned int nonstatic_byte_count   = fac->count[NONSTATIC_BYTE]   - fac_contended.count[NONSTATIC_BYTE];
4083   unsigned int nonstatic_oop_count    = fac->count[NONSTATIC_OOP]    - fac_contended.count[NONSTATIC_OOP];
4084 
4085   // Total non-static fields count, including every contended field
4086   unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
4087                                         fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
4088                                         fac->count[NONSTATIC_OOP];
4089 
4090   const bool super_has_nonstatic_fields =
4091           (_super_klass != NULL && _super_klass->has_nonstatic_fields());
4092   const bool has_nonstatic_fields =
4093     super_has_nonstatic_fields || (nonstatic_fields_count != 0);
4094 
4095 
4096   // Prepare list of oops for oop map generation.
4097   //
4098   // "offset" and "count" lists are describing the set of contiguous oop
4099   // regions. offset[i] is the start of the i-th region, which then has
4100   // count[i] oops following. Before we know how many regions are required,
4101   // we pessimistically allocate the maps to fit all the oops into the
4102   // distinct regions.
4103   //
4104   // TODO: We add +1 to always allocate non-zero resource arrays; we need
4105   // to figure out if we still need to do this.
4106   unsigned int nonstatic_oop_map_count = 0;
4107   unsigned int max_nonstatic_oop_maps  = fac->count[NONSTATIC_OOP] + 1;
4108 
4109   int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
4110             THREAD, int, max_nonstatic_oop_maps);
4111   unsigned int* const nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
4112             THREAD, unsigned int, max_nonstatic_oop_maps);
4113 
4114   int first_nonstatic_oop_offset = 0; // will be set for first oop field
4115 
4116   bool compact_fields  = true;
4117   bool allocate_oops_first = false;
4118 
4119   // The next classes have predefined hard-coded fields offsets
4120   // (see in JavaClasses::compute_hard_coded_offsets()).
4121   // Use default fields allocation order for them.
4122   if (_loader_data->class_loader() == NULL &&
4123       (_class_name == vmSymbols::java_lang_ref_Reference() ||
4124        _class_name == vmSymbols::java_lang_Boolean() ||
4125        _class_name == vmSymbols::java_lang_Character() ||
4126        _class_name == vmSymbols::java_lang_Float() ||
4127        _class_name == vmSymbols::java_lang_Double() ||
4128        _class_name == vmSymbols::java_lang_Byte() ||
4129        _class_name == vmSymbols::java_lang_Short() ||
4130        _class_name == vmSymbols::java_lang_Integer() ||
4131        _class_name == vmSymbols::java_lang_Long())) {
4132     allocate_oops_first = true;     // Allocate oops first
4133     compact_fields   = false; // Don't compact fields
4134   }
4135 
4136   int next_nonstatic_oop_offset = 0;
4137   int next_nonstatic_double_offset = 0;
4138 
4139   // Rearrange fields for a given allocation style
4140   if (allocate_oops_first) {
4141     // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
4142     next_nonstatic_oop_offset    = next_nonstatic_field_offset;
4143     next_nonstatic_double_offset = next_nonstatic_oop_offset +
4144                                     (nonstatic_oop_count * heapOopSize);
4145   } else {
4146     // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
4147     next_nonstatic_double_offset = next_nonstatic_field_offset;
4148   }
4149 
4150   int nonstatic_oop_space_count   = 0;
4151   int nonstatic_word_space_count  = 0;
4152   int nonstatic_short_space_count = 0;
4153   int nonstatic_byte_space_count  = 0;
4154   int nonstatic_oop_space_offset = 0;
4155   int nonstatic_word_space_offset = 0;
4156   int nonstatic_short_space_offset = 0;
4157   int nonstatic_byte_space_offset = 0;
4158 
4159   // Try to squeeze some of the fields into the gaps due to
4160   // long/double alignment.
4161   if (nonstatic_double_count > 0) {
4162     int offset = next_nonstatic_double_offset;
4163     next_nonstatic_double_offset = align_up(offset, BytesPerLong);
4164     if (compact_fields && offset != next_nonstatic_double_offset) {
4165       // Allocate available fields into the gap before double field.
4166       int length = next_nonstatic_double_offset - offset;
4167       assert(length == BytesPerInt, "");
4168       nonstatic_word_space_offset = offset;
4169       if (nonstatic_word_count > 0) {
4170         nonstatic_word_count      -= 1;
4171         nonstatic_word_space_count = 1; // Only one will fit
4172         length -= BytesPerInt;
4173         offset += BytesPerInt;
4174       }
4175       nonstatic_short_space_offset = offset;
4176       while (length >= BytesPerShort && nonstatic_short_count > 0) {
4177         nonstatic_short_count       -= 1;
4178         nonstatic_short_space_count += 1;
4179         length -= BytesPerShort;
4180         offset += BytesPerShort;
4181       }
4182       nonstatic_byte_space_offset = offset;
4183       while (length > 0 && nonstatic_byte_count > 0) {
4184         nonstatic_byte_count       -= 1;
4185         nonstatic_byte_space_count += 1;
4186         length -= 1;
4187       }
4188       // Allocate oop field in the gap if there are no other fields for that.
4189       nonstatic_oop_space_offset = offset;
4190       if (length >= heapOopSize && nonstatic_oop_count > 0 &&
4191           !allocate_oops_first) { // when oop fields not first
4192         nonstatic_oop_count      -= 1;
4193         nonstatic_oop_space_count = 1; // Only one will fit
4194         length -= heapOopSize;
4195         offset += heapOopSize;
4196       }
4197     }
4198   }
4199 
4200   int next_nonstatic_word_offset = next_nonstatic_double_offset +
4201                                      (nonstatic_double_count * BytesPerLong);
4202   int next_nonstatic_short_offset = next_nonstatic_word_offset +
4203                                       (nonstatic_word_count * BytesPerInt);
4204   int next_nonstatic_byte_offset = next_nonstatic_short_offset +
4205                                      (nonstatic_short_count * BytesPerShort);
4206   int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
4207                                        nonstatic_byte_count;
4208 
4209   // let oops jump before padding with this allocation style
4210   if (!allocate_oops_first) {
4211     next_nonstatic_oop_offset = next_nonstatic_padded_offset;
4212     if( nonstatic_oop_count > 0 ) {
4213       next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize);
4214     }
4215     next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
4216   }
4217 
4218   // Iterate over fields again and compute correct offsets.
4219   // The field allocation type was temporarily stored in the offset slot.
4220   // oop fields are located before non-oop fields (static and non-static).
4221   for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4222 
4223     // skip already laid out fields
4224     if (fs.is_offset_set()) continue;
4225 
4226     // contended instance fields are handled below
4227     if (fs.is_contended() && !fs.access_flags().is_static()) continue;
4228 
4229     int real_offset = 0;
4230     const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
4231 
4232     // pack the rest of the fields
4233     switch (atype) {
4234       case STATIC_OOP:
4235         real_offset = next_static_oop_offset;
4236         next_static_oop_offset += heapOopSize;
4237         break;
4238       case STATIC_BYTE:
4239         real_offset = next_static_byte_offset;
4240         next_static_byte_offset += 1;
4241         break;
4242       case STATIC_SHORT:
4243         real_offset = next_static_short_offset;
4244         next_static_short_offset += BytesPerShort;
4245         break;
4246       case STATIC_WORD:
4247         real_offset = next_static_word_offset;
4248         next_static_word_offset += BytesPerInt;
4249         break;
4250       case STATIC_DOUBLE:
4251         real_offset = next_static_double_offset;
4252         next_static_double_offset += BytesPerLong;
4253         break;
4254       case NONSTATIC_OOP:
4255         if( nonstatic_oop_space_count > 0 ) {
4256           real_offset = nonstatic_oop_space_offset;
4257           nonstatic_oop_space_offset += heapOopSize;
4258           nonstatic_oop_space_count  -= 1;
4259         } else {
4260           real_offset = next_nonstatic_oop_offset;
4261           next_nonstatic_oop_offset += heapOopSize;
4262         }
4263 
4264         // Record this oop in the oop maps
4265         if( nonstatic_oop_map_count > 0 &&
4266             nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4267             real_offset -
4268             int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4269             heapOopSize ) {
4270           // This oop is adjacent to the previous one, add to current oop map
4271           assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4272           nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4273         } else {
4274           // This oop is not adjacent to the previous one, create new oop map
4275           assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4276           nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4277           nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4278           nonstatic_oop_map_count += 1;
4279           if( first_nonstatic_oop_offset == 0 ) { // Undefined
4280             first_nonstatic_oop_offset = real_offset;
4281           }
4282         }
4283         break;
4284       case NONSTATIC_BYTE:
4285         if( nonstatic_byte_space_count > 0 ) {
4286           real_offset = nonstatic_byte_space_offset;
4287           nonstatic_byte_space_offset += 1;
4288           nonstatic_byte_space_count  -= 1;
4289         } else {
4290           real_offset = next_nonstatic_byte_offset;
4291           next_nonstatic_byte_offset += 1;
4292         }
4293         break;
4294       case NONSTATIC_SHORT:
4295         if( nonstatic_short_space_count > 0 ) {
4296           real_offset = nonstatic_short_space_offset;
4297           nonstatic_short_space_offset += BytesPerShort;
4298           nonstatic_short_space_count  -= 1;
4299         } else {
4300           real_offset = next_nonstatic_short_offset;
4301           next_nonstatic_short_offset += BytesPerShort;
4302         }
4303         break;
4304       case NONSTATIC_WORD:
4305         if( nonstatic_word_space_count > 0 ) {
4306           real_offset = nonstatic_word_space_offset;
4307           nonstatic_word_space_offset += BytesPerInt;
4308           nonstatic_word_space_count  -= 1;
4309         } else {
4310           real_offset = next_nonstatic_word_offset;
4311           next_nonstatic_word_offset += BytesPerInt;
4312         }
4313         break;
4314       case NONSTATIC_DOUBLE:
4315         real_offset = next_nonstatic_double_offset;
4316         next_nonstatic_double_offset += BytesPerLong;
4317         break;
4318       default:
4319         ShouldNotReachHere();
4320     }
4321     fs.set_offset(real_offset);
4322   }
4323 
4324 
4325   // Handle the contended cases.
4326   //
4327   // Each contended field should not intersect the cache line with another contended field.
4328   // In the absence of alignment information, we end up with pessimistically separating
4329   // the fields with full-width padding.
4330   //
4331   // Additionally, this should not break alignment for the fields, so we round the alignment up
4332   // for each field.
4333   if (nonstatic_contended_count > 0) {
4334 
4335     // if there is at least one contended field, we need to have pre-padding for them
4336     next_nonstatic_padded_offset += ContendedPaddingWidth;
4337 
4338     // collect all contended groups
4339     ResourceBitMap bm(cp->size());
4340     for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4341       // skip already laid out fields
4342       if (fs.is_offset_set()) continue;
4343 
4344       if (fs.is_contended()) {
4345         bm.set_bit(fs.contended_group());
4346       }
4347     }
4348 
4349     int current_group = -1;
4350     while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
4351 
4352       for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
4353 
4354         // skip already laid out fields
4355         if (fs.is_offset_set()) continue;
4356 
4357         // skip non-contended fields and fields from different group
4358         if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
4359 
4360         // handle statics below
4361         if (fs.access_flags().is_static()) continue;
4362 
4363         int real_offset = 0;
4364         FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
4365 
4366         switch (atype) {
4367           case NONSTATIC_BYTE:
4368             next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1);
4369             real_offset = next_nonstatic_padded_offset;
4370             next_nonstatic_padded_offset += 1;
4371             break;
4372 
4373           case NONSTATIC_SHORT:
4374             next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort);
4375             real_offset = next_nonstatic_padded_offset;
4376             next_nonstatic_padded_offset += BytesPerShort;
4377             break;
4378 
4379           case NONSTATIC_WORD:
4380             next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt);
4381             real_offset = next_nonstatic_padded_offset;
4382             next_nonstatic_padded_offset += BytesPerInt;
4383             break;
4384 
4385           case NONSTATIC_DOUBLE:
4386             next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong);
4387             real_offset = next_nonstatic_padded_offset;
4388             next_nonstatic_padded_offset += BytesPerLong;
4389             break;
4390 
4391           case NONSTATIC_OOP:
4392             next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize);
4393             real_offset = next_nonstatic_padded_offset;
4394             next_nonstatic_padded_offset += heapOopSize;
4395 
4396             // Record this oop in the oop maps
4397             if( nonstatic_oop_map_count > 0 &&
4398                 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4399                 real_offset -
4400                 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4401                 heapOopSize ) {
4402               // This oop is adjacent to the previous one, add to current oop map
4403               assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4404               nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4405             } else {
4406               // This oop is not adjacent to the previous one, create new oop map
4407               assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4408               nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4409               nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4410               nonstatic_oop_map_count += 1;
4411               if( first_nonstatic_oop_offset == 0 ) { // Undefined
4412                 first_nonstatic_oop_offset = real_offset;
4413               }
4414             }
4415             break;
4416 
4417           default:
4418             ShouldNotReachHere();
4419         }
4420 
4421         if (fs.contended_group() == 0) {
4422           // Contended group defines the equivalence class over the fields:
4423           // the fields within the same contended group are not inter-padded.
4424           // The only exception is default group, which does not incur the
4425           // equivalence, and so requires intra-padding.
4426           next_nonstatic_padded_offset += ContendedPaddingWidth;
4427         }
4428 
4429         fs.set_offset(real_offset);
4430       } // for
4431 
4432       // Start laying out the next group.
4433       // Note that this will effectively pad the last group in the back;
4434       // this is expected to alleviate memory contention effects for
4435       // subclass fields and/or adjacent object.
4436       // If this was the default group, the padding is already in place.
4437       if (current_group != 0) {
4438         next_nonstatic_padded_offset += ContendedPaddingWidth;
4439       }
4440     }
4441 
4442     // handle static fields
4443   }
4444 
4445   // Entire class is contended, pad in the back.
4446   // This helps to alleviate memory contention effects for subclass fields
4447   // and/or adjacent object.
4448   if (is_contended_class) {
4449     next_nonstatic_padded_offset += ContendedPaddingWidth;
4450   }
4451 
4452   int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4453 
4454   int nonstatic_fields_end      = align_up(notaligned_nonstatic_fields_end, heapOopSize);
4455   int instance_end              = align_up(notaligned_nonstatic_fields_end, wordSize);
4456   int static_fields_end         = align_up(next_static_byte_offset, wordSize);
4457 
4458   int static_field_size         = (static_fields_end -
4459                                    InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4460   nonstatic_field_size          = nonstatic_field_size +
4461                                   (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4462 
4463   int instance_size             = align_object_size(instance_end / wordSize);
4464 
4465   assert(instance_size == align_object_size(align_up(
4466          (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4467           wordSize) / wordSize), "consistent layout helper value");
4468 
4469   // Invariant: nonstatic_field end/start should only change if there are
4470   // nonstatic fields in the class, or if the class is contended. We compare
4471   // against the non-aligned value, so that end alignment will not fail the
4472   // assert without actually having the fields.
4473   assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4474          is_contended_class ||
4475          (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4476 
4477   // Number of non-static oop map blocks allocated at end of klass.
4478   const unsigned int total_oop_map_count =
4479     compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4480                           first_nonstatic_oop_offset);
4481 
4482 #ifndef PRODUCT
4483   if (PrintFieldLayout) {
4484     print_field_layout(_class_name,
4485           _fields,
4486           cp,
4487           instance_size,
4488           nonstatic_fields_start,
4489           nonstatic_fields_end,
4490           static_fields_end);
4491   }
4492 
4493 #endif
4494   // Pass back information needed for InstanceKlass creation
4495   info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4496   info->nonstatic_oop_counts = nonstatic_oop_counts;
4497   info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4498   info->total_oop_map_count = total_oop_map_count;
4499   info->instance_size = instance_size;
4500   info->static_field_size = static_field_size;
4501   info->nonstatic_field_size = nonstatic_field_size;
4502   info->has_nonstatic_fields = has_nonstatic_fields;
4503 }
4504 
4505 static void fill_oop_maps(const InstanceKlass* k,
4506                           unsigned int nonstatic_oop_map_count,
4507                           const int* nonstatic_oop_offsets,
4508                           const unsigned int* nonstatic_oop_counts) {
4509 
4510   assert(k != NULL, "invariant");
4511 
4512   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4513   const InstanceKlass* const super = k->superklass();
4514   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4515   if (super_count > 0) {
4516     // Copy maps from superklass
4517     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4518     for (unsigned int i = 0; i < super_count; ++i) {
4519       *this_oop_map++ = *super_oop_map++;
4520     }
4521   }
4522 
4523   if (nonstatic_oop_map_count > 0) {
4524     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4525       // The counts differ because there is no gap between superklass's last oop
4526       // field and the first local oop field.  Extend the last oop map copied
4527       // from the superklass instead of creating new one.
4528       nonstatic_oop_map_count--;
4529       nonstatic_oop_offsets++;
4530       this_oop_map--;
4531       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4532       this_oop_map++;
4533     }
4534 
4535     // Add new map blocks, fill them
4536     while (nonstatic_oop_map_count-- > 0) {
4537       this_oop_map->set_offset(*nonstatic_oop_offsets++);
4538       this_oop_map->set_count(*nonstatic_oop_counts++);
4539       this_oop_map++;
4540     }
4541     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4542            this_oop_map, "sanity");
4543   }
4544 }
4545 
4546 
4547 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4548   assert(ik != NULL, "invariant");
4549 
4550   const Klass* const super = ik->super();
4551 
4552   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4553   // in which case we don't have to register objects as finalizable
4554   if (!_has_empty_finalizer) {
4555     if (_has_finalizer ||
4556         (super != NULL && super->has_finalizer())) {
4557       ik->set_has_finalizer();
4558     }
4559   }
4560 
4561 #ifdef ASSERT
4562   bool f = false;
4563   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4564                                            vmSymbols::void_method_signature());
4565   if (m != NULL && !m->is_empty_method()) {
4566       f = true;
4567   }
4568 
4569   // Spec doesn't prevent agent from redefinition of empty finalizer.
4570   // Despite the fact that it's generally bad idea and redefined finalizer
4571   // will not work as expected we shouldn't abort vm in this case
4572   if (!ik->has_redefined_this_or_super()) {
4573     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4574   }
4575 #endif
4576 
4577   // Check if this klass supports the java.lang.Cloneable interface
4578   if (SystemDictionary::Cloneable_klass_loaded()) {
4579     if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4580       ik->set_is_cloneable();
4581     }
4582   }
4583 
4584   // Check if this klass has a vanilla default constructor
4585   if (super == NULL) {
4586     // java.lang.Object has empty default constructor
4587     ik->set_has_vanilla_constructor();
4588   } else {
4589     if (super->has_vanilla_constructor() &&
4590         _has_vanilla_constructor) {
4591       ik->set_has_vanilla_constructor();
4592     }
4593 #ifdef ASSERT
4594     bool v = false;
4595     if (super->has_vanilla_constructor()) {
4596       const Method* const constructor =
4597         ik->find_method(vmSymbols::object_initializer_name(),
4598                        vmSymbols::void_method_signature());
4599       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4600         v = true;
4601       }
4602     }
4603     assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4604 #endif
4605   }
4606 
4607   // If it cannot be fast-path allocated, set a bit in the layout helper.
4608   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4609   assert(ik->size_helper() > 0, "layout_helper is initialized");
4610   if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4611       || ik->is_abstract() || ik->is_interface()
4612       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4613       || ik->size_helper() >= FastAllocateSizeLimit) {
4614     // Forbid fast-path allocation.
4615     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4616     ik->set_layout_helper(lh);
4617   }
4618 }
4619 
4620 // utility methods for appending an array with check for duplicates
4621 
4622 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4623                               const Array<InstanceKlass*>* const ifs) {
4624   // iterate over new interfaces
4625   for (int i = 0; i < ifs->length(); i++) {
4626     InstanceKlass* const e = ifs->at(i);
4627     assert(e->is_klass() && e->is_interface(), "just checking");
4628     // add new interface
4629     result->append_if_missing(e);
4630   }
4631 }
4632 
4633 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4634                                                             Array<InstanceKlass*>* local_ifs,
4635                                                             ClassLoaderData* loader_data,
4636                                                             TRAPS) {
4637   assert(local_ifs != NULL, "invariant");
4638   assert(loader_data != NULL, "invariant");
4639 
4640   // Compute maximum size for transitive interfaces
4641   int max_transitive_size = 0;
4642   int super_size = 0;
4643   // Add superclass transitive interfaces size
4644   if (super != NULL) {
4645     super_size = super->transitive_interfaces()->length();
4646     max_transitive_size += super_size;
4647   }
4648   // Add local interfaces' super interfaces
4649   const int local_size = local_ifs->length();
4650   for (int i = 0; i < local_size; i++) {
4651     InstanceKlass* const l = local_ifs->at(i);
4652     max_transitive_size += l->transitive_interfaces()->length();
4653   }
4654   // Finally add local interfaces
4655   max_transitive_size += local_size;
4656   // Construct array
4657   if (max_transitive_size == 0) {
4658     // no interfaces, use canonicalized array
4659     return Universe::the_empty_instance_klass_array();
4660   } else if (max_transitive_size == super_size) {
4661     // no new local interfaces added, share superklass' transitive interface array
4662     return super->transitive_interfaces();
4663   } else if (max_transitive_size == local_size) {
4664     // only local interfaces added, share local interface array
4665     return local_ifs;
4666   } else {
4667     ResourceMark rm;
4668     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4669 
4670     // Copy down from superclass
4671     if (super != NULL) {
4672       append_interfaces(result, super->transitive_interfaces());
4673     }
4674 
4675     // Copy down from local interfaces' superinterfaces
4676     for (int i = 0; i < local_size; i++) {
4677       InstanceKlass* const l = local_ifs->at(i);
4678       append_interfaces(result, l->transitive_interfaces());
4679     }
4680     // Finally add local interfaces
4681     append_interfaces(result, local_ifs);
4682 
4683     // length will be less than the max_transitive_size if duplicates were removed
4684     const int length = result->length();
4685     assert(length <= max_transitive_size, "just checking");
4686     Array<InstanceKlass*>* const new_result =
4687       MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4688     for (int i = 0; i < length; i++) {
4689       InstanceKlass* const e = result->at(i);
4690       assert(e != NULL, "just checking");
4691       new_result->at_put(i, e);
4692     }
4693     return new_result;
4694   }
4695 }
4696 
4697 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4698   assert(this_klass != NULL, "invariant");
4699   const Klass* const super = this_klass->super();
4700 
4701   if (super != NULL) {
4702 
4703     // If the loader is not the boot loader then throw an exception if its
4704     // superclass is in package jdk.internal.reflect and its loader is not a
4705     // special reflection class loader
4706     if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4707       assert(super->is_instance_klass(), "super is not instance klass");
4708       PackageEntry* super_package = super->package();
4709       if (super_package != NULL &&
4710           super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4711           !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4712         ResourceMark rm(THREAD);
4713         Exceptions::fthrow(
4714           THREAD_AND_LOCATION,
4715           vmSymbols::java_lang_IllegalAccessError(),
4716           "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4717           this_klass->external_name(),
4718           this_klass->class_loader_data()->loader_name_and_id(),
4719           super->external_name());
4720         return;
4721       }
4722     }
4723 
4724     Reflection::VerifyClassAccessResults vca_result =
4725       Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4726     if (vca_result != Reflection::ACCESS_OK) {
4727       ResourceMark rm(THREAD);
4728       char* msg = Reflection::verify_class_access_msg(this_klass,
4729                                                       InstanceKlass::cast(super),
4730                                                       vca_result);
4731       if (msg == NULL) {
4732         bool same_module = (this_klass->module() == super->module());
4733         Exceptions::fthrow(
4734           THREAD_AND_LOCATION,
4735           vmSymbols::java_lang_IllegalAccessError(),
4736           "class %s cannot access its %ssuperclass %s (%s%s%s)",
4737           this_klass->external_name(),
4738           super->is_abstract() ? "abstract " : "",
4739           super->external_name(),
4740           (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4741           (same_module) ? "" : "; ",
4742           (same_module) ? "" : super->class_in_module_of_loader());
4743       } else {
4744         // Add additional message content.
4745         Exceptions::fthrow(
4746           THREAD_AND_LOCATION,
4747           vmSymbols::java_lang_IllegalAccessError(),
4748           "superclass access check failed: %s",
4749           msg);
4750       }
4751     }
4752   }
4753 }
4754 
4755 
4756 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4757   assert(this_klass != NULL, "invariant");
4758   const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4759   const int lng = local_interfaces->length();
4760   for (int i = lng - 1; i >= 0; i--) {
4761     InstanceKlass* const k = local_interfaces->at(i);
4762     assert (k != NULL && k->is_interface(), "invalid interface");
4763     Reflection::VerifyClassAccessResults vca_result =
4764       Reflection::verify_class_access(this_klass, k, false);
4765     if (vca_result != Reflection::ACCESS_OK) {
4766       ResourceMark rm(THREAD);
4767       char* msg = Reflection::verify_class_access_msg(this_klass,
4768                                                       k,
4769                                                       vca_result);
4770       if (msg == NULL) {
4771         bool same_module = (this_klass->module() == k->module());
4772         Exceptions::fthrow(
4773           THREAD_AND_LOCATION,
4774           vmSymbols::java_lang_IllegalAccessError(),
4775           "class %s cannot access its superinterface %s (%s%s%s)",
4776           this_klass->external_name(),
4777           k->external_name(),
4778           (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4779           (same_module) ? "" : "; ",
4780           (same_module) ? "" : k->class_in_module_of_loader());
4781       } else {
4782         // Add additional message content.
4783         Exceptions::fthrow(
4784           THREAD_AND_LOCATION,
4785           vmSymbols::java_lang_IllegalAccessError(),
4786           "superinterface check failed: %s",
4787           msg);
4788       }
4789     }
4790   }
4791 }
4792 
4793 
4794 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4795   assert(this_klass != NULL, "invariant");
4796   const Array<Method*>* const methods = this_klass->methods();
4797   const int num_methods = methods->length();
4798 
4799   // go thru each method and check if it overrides a final method
4800   for (int index = 0; index < num_methods; index++) {
4801     const Method* const m = methods->at(index);
4802 
4803     // skip private, static, and <init> methods
4804     if ((!m->is_private() && !m->is_static()) &&
4805         (m->name() != vmSymbols::object_initializer_name())) {
4806 
4807       const Symbol* const name = m->name();
4808       const Symbol* const signature = m->signature();
4809       const Klass* k = this_klass->super();
4810       const Method* super_m = NULL;
4811       while (k != NULL) {
4812         // skip supers that don't have final methods.
4813         if (k->has_final_method()) {
4814           // lookup a matching method in the super class hierarchy
4815           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4816           if (super_m == NULL) {
4817             break; // didn't find any match; get out
4818           }
4819 
4820           if (super_m->is_final() && !super_m->is_static() &&
4821               !super_m->access_flags().is_private()) {
4822             // matching method in super is final, and not static or private
4823             bool can_access = Reflection::verify_member_access(this_klass,
4824                                                                super_m->method_holder(),
4825                                                                super_m->method_holder(),
4826                                                                super_m->access_flags(),
4827                                                               false, false, CHECK);
4828             if (can_access) {
4829               // this class can access super final method and therefore override
4830               ResourceMark rm(THREAD);
4831               Exceptions::fthrow(THREAD_AND_LOCATION,
4832                                  vmSymbols::java_lang_VerifyError(),
4833                                  "class %s overrides final method %s.%s%s",
4834                                  this_klass->external_name(),
4835                                  super_m->method_holder()->external_name(),
4836                                  name->as_C_string(),
4837                                  signature->as_C_string()
4838                                  );
4839               return;
4840             }
4841           }
4842 
4843           // continue to look from super_m's holder's super.
4844           k = super_m->method_holder()->super();
4845           continue;
4846         }
4847 
4848         k = k->super();
4849       }
4850     }
4851   }
4852 }
4853 
4854 
4855 // assumes that this_klass is an interface
4856 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4857   assert(this_klass != NULL, "invariant");
4858   assert(this_klass->is_interface(), "not an interface");
4859   const Array<Method*>* methods = this_klass->methods();
4860   const int num_methods = methods->length();
4861 
4862   for (int index = 0; index < num_methods; index++) {
4863     const Method* const m = methods->at(index);
4864     // if m is static and not the init method, throw a verify error
4865     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4866       ResourceMark rm(THREAD);
4867       Exceptions::fthrow(
4868         THREAD_AND_LOCATION,
4869         vmSymbols::java_lang_VerifyError(),
4870         "Illegal static method %s in interface %s",
4871         m->name()->as_C_string(),
4872         this_klass->external_name()
4873       );
4874       return;
4875     }
4876   }
4877 }
4878 
4879 // utility methods for format checking
4880 
4881 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4882   const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4883   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4884   if (is_module) {
4885     ResourceMark rm(THREAD);
4886     Exceptions::fthrow(
4887       THREAD_AND_LOCATION,
4888       vmSymbols::java_lang_NoClassDefFoundError(),
4889       "%s is not a class because access_flag ACC_MODULE is set",
4890       _class_name->as_C_string());
4891     return;
4892   }
4893 
4894   if (!_need_verify) { return; }
4895 
4896   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4897   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4898   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4899   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4900   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4901   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4902   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4903   const bool major_gte_14  = _major_version >= JAVA_14_VERSION;
4904 
4905   if ((is_abstract && is_final) ||
4906       (is_interface && !is_abstract) ||
4907       (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4908       (!is_interface && major_gte_1_5 && is_annotation)) {
4909     ResourceMark rm(THREAD);
4910     Exceptions::fthrow(
4911       THREAD_AND_LOCATION,
4912       vmSymbols::java_lang_ClassFormatError(),
4913       "Illegal class modifiers in class %s: 0x%X",
4914       _class_name->as_C_string(), flags
4915     );
4916     return;
4917   }
4918 }
4919 
4920 static bool has_illegal_visibility(jint flags) {
4921   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4922   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4923   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4924 
4925   return ((is_public && is_protected) ||
4926           (is_public && is_private) ||
4927           (is_protected && is_private));
4928 }
4929 
4930 // A legal major_version.minor_version must be one of the following:
4931 //
4932 //  Major_version >= 45 and major_version < 56, any minor_version.
4933 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4934 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4935 //
4936 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4937   ResourceMark rm(THREAD);
4938   const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4939   if (major < JAVA_MIN_SUPPORTED_VERSION) {
4940     Exceptions::fthrow(
4941       THREAD_AND_LOCATION,
4942       vmSymbols::java_lang_UnsupportedClassVersionError(),
4943       "%s (class file version %u.%u) was compiled with an invalid major version",
4944       class_name->as_C_string(), major, minor);
4945     return;
4946   }
4947 
4948   if (major > max_version) {
4949     Exceptions::fthrow(
4950       THREAD_AND_LOCATION,
4951       vmSymbols::java_lang_UnsupportedClassVersionError(),
4952       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4953       "this version of the Java Runtime only recognizes class file versions up to %u.0",
4954       class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4955     return;
4956   }
4957 
4958   if (major < JAVA_12_VERSION || minor == 0) {
4959     return;
4960   }
4961 
4962   if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4963     if (major != max_version) {
4964       Exceptions::fthrow(
4965         THREAD_AND_LOCATION,
4966         vmSymbols::java_lang_UnsupportedClassVersionError(),
4967         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4968         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4969         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4970       return;
4971     }
4972 
4973     if (!Arguments::enable_preview()) {
4974       Exceptions::fthrow(
4975         THREAD_AND_LOCATION,
4976         vmSymbols::java_lang_UnsupportedClassVersionError(),
4977         "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4978         class_name->as_C_string(), major, minor);
4979       return;
4980     }
4981 
4982   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4983     Exceptions::fthrow(
4984         THREAD_AND_LOCATION,
4985         vmSymbols::java_lang_UnsupportedClassVersionError(),
4986         "%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4987         class_name->as_C_string(), major, minor);
4988   }
4989 }
4990 
4991 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4992                                                    bool is_interface,
4993                                                    TRAPS) const {
4994   if (!_need_verify) { return; }
4995 
4996   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4997   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4998   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4999   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
5000   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
5001   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
5002   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
5003   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
5004   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
5005 
5006   bool is_illegal = false;
5007 
5008   if (is_interface) {
5009     if (!is_public || !is_static || !is_final || is_private ||
5010         is_protected || is_volatile || is_transient ||
5011         (major_gte_1_5 && is_enum)) {
5012       is_illegal = true;
5013     }
5014   } else { // not interface
5015     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
5016       is_illegal = true;
5017     }
5018   }
5019 
5020   if (is_illegal) {
5021     ResourceMark rm(THREAD);
5022     Exceptions::fthrow(
5023       THREAD_AND_LOCATION,
5024       vmSymbols::java_lang_ClassFormatError(),
5025       "Illegal field modifiers in class %s: 0x%X",
5026       _class_name->as_C_string(), flags);
5027     return;
5028   }
5029 }
5030 
5031 void ClassFileParser::verify_legal_method_modifiers(jint flags,
5032                                                     bool is_interface,
5033                                                     const Symbol* name,
5034                                                     TRAPS) const {
5035   if (!_need_verify) { return; }
5036 
5037   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
5038   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
5039   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
5040   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
5041   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
5042   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
5043   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
5044   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
5045   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5046   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
5047   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
5048   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
5049   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
5050 
5051   bool is_illegal = false;
5052 
5053   if (is_interface) {
5054     if (major_gte_8) {
5055       // Class file version is JAVA_8_VERSION or later Methods of
5056       // interfaces may set any of the flags except ACC_PROTECTED,
5057       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5058       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5059       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5060           (is_native || is_protected || is_final || is_synchronized) ||
5061           // If a specific method of a class or interface has its
5062           // ACC_ABSTRACT flag set, it must not have any of its
5063           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5064           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
5065           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5066           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5067           (is_abstract && (is_private || is_static || is_strict))) {
5068         is_illegal = true;
5069       }
5070     } else if (major_gte_1_5) {
5071       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5072       if (!is_public || is_private || is_protected || is_static || is_final ||
5073           is_synchronized || is_native || !is_abstract || is_strict) {
5074         is_illegal = true;
5075       }
5076     } else {
5077       // Class file version is pre-JAVA_1_5_VERSION
5078       if (!is_public || is_static || is_final || is_native || !is_abstract) {
5079         is_illegal = true;
5080       }
5081     }
5082   } else { // not interface
5083     if (has_illegal_visibility(flags)) {
5084       is_illegal = true;
5085     } else {
5086       if (is_initializer) {
5087         if (is_static || is_final || is_synchronized || is_native ||
5088             is_abstract || (major_gte_1_5 && is_bridge)) {
5089           is_illegal = true;
5090         }
5091       } else { // not initializer
5092         if (is_abstract) {
5093           if ((is_final || is_native || is_private || is_static ||
5094               (major_gte_1_5 && (is_synchronized || is_strict)))) {
5095             is_illegal = true;
5096           }
5097         }
5098       }
5099     }
5100   }
5101 
5102   if (is_illegal) {
5103     ResourceMark rm(THREAD);
5104     Exceptions::fthrow(
5105       THREAD_AND_LOCATION,
5106       vmSymbols::java_lang_ClassFormatError(),
5107       "Method %s in class %s has illegal modifiers: 0x%X",
5108       name->as_C_string(), _class_name->as_C_string(), flags);
5109     return;
5110   }
5111 }
5112 
5113 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5114                                         int length,
5115                                         TRAPS) const {
5116   assert(_need_verify, "only called when _need_verify is true");
5117   if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5118     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5119   }
5120 }
5121 
5122 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5123 // In class names, '/' separates unqualified names.  This is verified in this function also.
5124 // Method names also may not contain the characters '<' or '>', unless <init>
5125 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
5126 // method.  Because these names have been checked as special cases before
5127 // calling this method in verify_legal_method_name.
5128 //
5129 // This method is also called from the modular system APIs in modules.cpp
5130 // to verify the validity of module and package names.
5131 bool ClassFileParser::verify_unqualified_name(const char* name,
5132                                               unsigned int length,
5133                                               int type) {
5134   if (length == 0) return false;  // Must have at least one char.
5135   for (const char* p = name; p != name + length; p++) {
5136     switch(*p) {
5137       case JVM_SIGNATURE_DOT:
5138       case JVM_SIGNATURE_ENDCLASS:
5139       case JVM_SIGNATURE_ARRAY:
5140         // do not permit '.', ';', or '['
5141         return false;
5142       case JVM_SIGNATURE_SLASH:
5143         // check for '//' or leading or trailing '/' which are not legal
5144         // unqualified name must not be empty
5145         if (type == ClassFileParser::LegalClass) {
5146           if (p == name || p+1 >= name+length ||
5147               *(p+1) == JVM_SIGNATURE_SLASH) {
5148             return false;
5149           }
5150         } else {
5151           return false;   // do not permit '/' unless it's class name
5152         }
5153         break;
5154       case JVM_SIGNATURE_SPECIAL:
5155       case JVM_SIGNATURE_ENDSPECIAL:
5156         // do not permit '<' or '>' in method names
5157         if (type == ClassFileParser::LegalMethod) {
5158           return false;
5159         }
5160     }
5161   }
5162   return true;
5163 }
5164 
5165 // Take pointer to a UTF8 byte string (not NUL-terminated).
5166 // Skip over the longest part of the string that could
5167 // be taken as a fieldname. Allow '/' if slash_ok is true.
5168 // Return a pointer to just past the fieldname.
5169 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5170 // being true, we saw consecutive slashes (meaning we were looking for a
5171 // qualified path but found something that was badly-formed).
5172 static const char* skip_over_field_name(const char* const name,
5173                                         bool slash_ok,
5174                                         unsigned int length) {
5175   const char* p;
5176   jboolean last_is_slash = false;
5177   jboolean not_first_ch = false;
5178 
5179   for (p = name; p != name + length; not_first_ch = true) {
5180     const char* old_p = p;
5181     jchar ch = *p;
5182     if (ch < 128) {
5183       p++;
5184       // quick check for ascii
5185       if ((ch >= 'a' && ch <= 'z') ||
5186         (ch >= 'A' && ch <= 'Z') ||
5187         (ch == '_' || ch == '$') ||
5188         (not_first_ch && ch >= '0' && ch <= '9')) {
5189         last_is_slash = false;
5190         continue;
5191       }
5192       if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
5193         if (last_is_slash) {
5194           return NULL;  // Don't permit consecutive slashes
5195         }
5196         last_is_slash = true;
5197         continue;
5198       }
5199     }
5200     else {
5201       jint unicode_ch;
5202       char* tmp_p = UTF8::next_character(p, &unicode_ch);
5203       p = tmp_p;
5204       last_is_slash = false;
5205       // Check if ch is Java identifier start or is Java identifier part
5206       // 4672820: call java.lang.Character methods directly without generating separate tables.
5207       EXCEPTION_MARK;
5208       // return value
5209       JavaValue result(T_BOOLEAN);
5210       // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
5211       JavaCallArguments args;
5212       args.push_int(unicode_ch);
5213 
5214       if (not_first_ch) {
5215         // public static boolean isJavaIdentifierPart(char ch);
5216         JavaCalls::call_static(&result,
5217           SystemDictionary::Character_klass(),
5218           vmSymbols::isJavaIdentifierPart_name(),
5219           vmSymbols::int_bool_signature(),
5220           &args,
5221           THREAD);
5222       } else {
5223         // public static boolean isJavaIdentifierStart(char ch);
5224         JavaCalls::call_static(&result,
5225           SystemDictionary::Character_klass(),
5226           vmSymbols::isJavaIdentifierStart_name(),
5227           vmSymbols::int_bool_signature(),
5228           &args,
5229           THREAD);
5230       }
5231       if (HAS_PENDING_EXCEPTION) {
5232         CLEAR_PENDING_EXCEPTION;
5233         return NULL;
5234       }
5235       if(result.get_jboolean()) {
5236         continue;
5237       }
5238     }
5239     return (not_first_ch) ? old_p : NULL;
5240   }
5241   return (not_first_ch) ? p : NULL;
5242 }
5243 
5244 // Take pointer to a UTF8 byte string (not NUL-terminated).
5245 // Skip over the longest part of the string that could
5246 // be taken as a field signature. Allow "void" if void_ok.
5247 // Return a pointer to just past the signature.
5248 // Return NULL if no legal signature is found.
5249 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5250                                                        bool void_ok,
5251                                                        unsigned int length,
5252                                                        TRAPS) const {
5253   unsigned int array_dim = 0;
5254   while (length > 0) {
5255     switch (signature[0]) {
5256     case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5257     case JVM_SIGNATURE_BOOLEAN:
5258     case JVM_SIGNATURE_BYTE:
5259     case JVM_SIGNATURE_CHAR:
5260     case JVM_SIGNATURE_SHORT:
5261     case JVM_SIGNATURE_INT:
5262     case JVM_SIGNATURE_FLOAT:
5263     case JVM_SIGNATURE_LONG:
5264     case JVM_SIGNATURE_DOUBLE:
5265       return signature + 1;
5266     case JVM_SIGNATURE_CLASS: {
5267       if (_major_version < JAVA_1_5_VERSION) {
5268         // Skip over the class name if one is there
5269         const char* const p = skip_over_field_name(signature + 1, true, --length);
5270 
5271         // The next character better be a semicolon
5272         if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5273           return p + 1;
5274         }
5275       }
5276       else {
5277         // Skip leading 'L' and ignore first appearance of ';'
5278         signature++;
5279         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5280         // Format check signature
5281         if (c != NULL) {
5282           int newlen = c - (char*) signature;
5283           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5284           if (!legal) {
5285             classfile_parse_error("Class name is empty or contains illegal character "
5286                                   "in descriptor in class file %s",
5287                                   CHECK_0);
5288             return NULL;
5289           }
5290           return signature + newlen + 1;
5291         }
5292       }
5293       return NULL;
5294     }
5295     case JVM_SIGNATURE_ARRAY:
5296       array_dim++;
5297       if (array_dim > 255) {
5298         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5299         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5300       }
5301       // The rest of what's there better be a legal signature
5302       signature++;
5303       length--;
5304       void_ok = false;
5305       break;
5306     default:
5307       return NULL;
5308     }
5309   }
5310   return NULL;
5311 }
5312 
5313 // Checks if name is a legal class name.
5314 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5315   if (!_need_verify || _relax_verify) { return; }
5316 
5317   assert(name->refcount() > 0, "symbol must be kept alive");
5318   char* bytes = (char*)name->bytes();
5319   unsigned int length = name->utf8_length();
5320   bool legal = false;
5321 
5322   if (length > 0) {
5323     const char* p;
5324     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5325       p = skip_over_field_signature(bytes, false, length, CHECK);
5326       legal = (p != NULL) && ((p - bytes) == (int)length);
5327     } else if (_major_version < JAVA_1_5_VERSION) {
5328       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5329         p = skip_over_field_name(bytes, true, length);
5330         legal = (p != NULL) && ((p - bytes) == (int)length);
5331       }
5332     } else {
5333       // 4900761: relax the constraints based on JSR202 spec
5334       // Class names may be drawn from the entire Unicode character set.
5335       // Identifiers between '/' must be unqualified names.
5336       // The utf8 string has been verified when parsing cpool entries.
5337       legal = verify_unqualified_name(bytes, length, LegalClass);
5338     }
5339   }
5340   if (!legal) {
5341     ResourceMark rm(THREAD);
5342     assert(_class_name != NULL, "invariant");
5343     Exceptions::fthrow(
5344       THREAD_AND_LOCATION,
5345       vmSymbols::java_lang_ClassFormatError(),
5346       "Illegal class name \"%.*s\" in class file %s", length, bytes,
5347       _class_name->as_C_string()
5348     );
5349     return;
5350   }
5351 }
5352 
5353 // Checks if name is a legal field name.
5354 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5355   if (!_need_verify || _relax_verify) { return; }
5356 
5357   char* bytes = (char*)name->bytes();
5358   unsigned int length = name->utf8_length();
5359   bool legal = false;
5360 
5361   if (length > 0) {
5362     if (_major_version < JAVA_1_5_VERSION) {
5363       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5364         const char* p = skip_over_field_name(bytes, false, length);
5365         legal = (p != NULL) && ((p - bytes) == (int)length);
5366       }
5367     } else {
5368       // 4881221: relax the constraints based on JSR202 spec
5369       legal = verify_unqualified_name(bytes, length, LegalField);
5370     }
5371   }
5372 
5373   if (!legal) {
5374     ResourceMark rm(THREAD);
5375     assert(_class_name != NULL, "invariant");
5376     Exceptions::fthrow(
5377       THREAD_AND_LOCATION,
5378       vmSymbols::java_lang_ClassFormatError(),
5379       "Illegal field name \"%.*s\" in class %s", length, bytes,
5380       _class_name->as_C_string()
5381     );
5382     return;
5383   }
5384 }
5385 
5386 // Checks if name is a legal method name.
5387 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5388   if (!_need_verify || _relax_verify) { return; }
5389 
5390   assert(name != NULL, "method name is null");
5391   char* bytes = (char*)name->bytes();
5392   unsigned int length = name->utf8_length();
5393   bool legal = false;
5394 
5395   if (length > 0) {
5396     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5397       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5398         legal = true;
5399       }
5400     } else if (_major_version < JAVA_1_5_VERSION) {
5401       const char* p;
5402       p = skip_over_field_name(bytes, false, length);
5403       legal = (p != NULL) && ((p - bytes) == (int)length);
5404     } else {
5405       // 4881221: relax the constraints based on JSR202 spec
5406       legal = verify_unqualified_name(bytes, length, LegalMethod);
5407     }
5408   }
5409 
5410   if (!legal) {
5411     ResourceMark rm(THREAD);
5412     assert(_class_name != NULL, "invariant");
5413     Exceptions::fthrow(
5414       THREAD_AND_LOCATION,
5415       vmSymbols::java_lang_ClassFormatError(),
5416       "Illegal method name \"%.*s\" in class %s", length, bytes,
5417       _class_name->as_C_string()
5418     );
5419     return;
5420   }
5421 }
5422 
5423 
5424 // Checks if signature is a legal field signature.
5425 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5426                                                    const Symbol* signature,
5427                                                    TRAPS) const {
5428   if (!_need_verify) { return; }
5429 
5430   const char* const bytes = (const char* const)signature->bytes();
5431   const unsigned int length = signature->utf8_length();
5432   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5433 
5434   if (p == NULL || (p - bytes) != (int)length) {
5435     throwIllegalSignature("Field", name, signature, CHECK);
5436   }
5437 }
5438 
5439 // Checks if signature is a legal method signature.
5440 // Returns number of parameters
5441 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5442                                                    const Symbol* signature,
5443                                                    TRAPS) const {
5444   if (!_need_verify) {
5445     // make sure caller's args_size will be less than 0 even for non-static
5446     // method so it will be recomputed in compute_size_of_parameters().
5447     return -2;
5448   }
5449 
5450   // Class initializers cannot have args for class format version >= 51.
5451   if (name == vmSymbols::class_initializer_name() &&
5452       signature != vmSymbols::void_method_signature() &&
5453       _major_version >= JAVA_7_VERSION) {
5454     throwIllegalSignature("Method", name, signature, CHECK_0);
5455     return 0;
5456   }
5457 
5458   unsigned int args_size = 0;
5459   const char* p = (const char*)signature->bytes();
5460   unsigned int length = signature->utf8_length();
5461   const char* nextp;
5462 
5463   // The first character must be a '('
5464   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5465     length--;
5466     // Skip over legal field signatures
5467     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5468     while ((length > 0) && (nextp != NULL)) {
5469       args_size++;
5470       if (p[0] == 'J' || p[0] == 'D') {
5471         args_size++;
5472       }
5473       length -= nextp - p;
5474       p = nextp;
5475       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5476     }
5477     // The first non-signature thing better be a ')'
5478     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5479       length--;
5480       if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
5481         // All internal methods must return void
5482         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5483           return args_size;
5484         }
5485       } else {
5486         // Now we better just have a return value
5487         nextp = skip_over_field_signature(p, true, length, CHECK_0);
5488         if (nextp && ((int)length == (nextp - p))) {
5489           return args_size;
5490         }
5491       }
5492     }
5493   }
5494   // Report error
5495   throwIllegalSignature("Method", name, signature, CHECK_0);
5496   return 0;
5497 }
5498 
5499 int ClassFileParser::static_field_size() const {
5500   assert(_field_info != NULL, "invariant");
5501   return _field_info->static_field_size;
5502 }
5503 
5504 int ClassFileParser::total_oop_map_count() const {
5505   assert(_field_info != NULL, "invariant");
5506   return _field_info->total_oop_map_count;
5507 }
5508 
5509 jint ClassFileParser::layout_size() const {
5510   assert(_field_info != NULL, "invariant");
5511   return _field_info->instance_size;
5512 }
5513 
5514 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5515                                          const Array<Method*>* methods) {
5516   assert(ik != NULL, "invariant");
5517   assert(methods != NULL, "invariant");
5518 
5519   // Set up Method*::intrinsic_id as soon as we know the names of methods.
5520   // (We used to do this lazily, but now we query it in Rewriter,
5521   // which is eagerly done for every method, so we might as well do it now,
5522   // when everything is fresh in memory.)
5523   const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5524 
5525   if (klass_id != vmSymbols::NO_SID) {
5526     for (int j = 0; j < methods->length(); ++j) {
5527       Method* method = methods->at(j);
5528       method->init_intrinsic_id();
5529 
5530       if (CheckIntrinsics) {
5531         // Check if an intrinsic is defined for method 'method',
5532         // but the method is not annotated with @HotSpotIntrinsicCandidate.
5533         if (method->intrinsic_id() != vmIntrinsics::_none &&
5534             !method->intrinsic_candidate()) {
5535               tty->print("Compiler intrinsic is defined for method [%s], "
5536               "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5537               method->name_and_sig_as_C_string(),
5538               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5539             );
5540           tty->cr();
5541           DEBUG_ONLY(vm_exit(1));
5542         }
5543         // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5544         // but there is no intrinsic available for it.
5545         if (method->intrinsic_candidate() &&
5546           method->intrinsic_id() == vmIntrinsics::_none) {
5547             tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5548               "but no compiler intrinsic is defined for the method.%s",
5549               method->name_and_sig_as_C_string(),
5550               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5551             );
5552           tty->cr();
5553           DEBUG_ONLY(vm_exit(1));
5554         }
5555       }
5556     } // end for
5557 
5558 #ifdef ASSERT
5559     if (CheckIntrinsics) {
5560       // Check for orphan methods in the current class. A method m
5561       // of a class C is orphan if an intrinsic is defined for method m,
5562       // but class C does not declare m.
5563       // The check is potentially expensive, therefore it is available
5564       // only in debug builds.
5565 
5566       for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5567         if (vmIntrinsics::_compiledLambdaForm == id) {
5568           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5569           // generated for the JVM from a LambdaForm and therefore no method
5570           // is defined for it.
5571           continue;
5572         }
5573 
5574         if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5575           // Check if the current class contains a method with the same
5576           // name, flags, signature.
5577           bool match = false;
5578           for (int j = 0; j < methods->length(); ++j) {
5579             const Method* method = methods->at(j);
5580             if (method->intrinsic_id() == id) {
5581               match = true;
5582               break;
5583             }
5584           }
5585 
5586           if (!match) {
5587             char buf[1000];
5588             tty->print("Compiler intrinsic is defined for method [%s], "
5589                        "but the method is not available in class [%s].%s",
5590                         vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5591                                                              buf, sizeof(buf)),
5592                         ik->name()->as_C_string(),
5593                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5594             );
5595             tty->cr();
5596             DEBUG_ONLY(vm_exit(1));
5597           }
5598         }
5599       } // end for
5600     } // CheckIntrinsics
5601 #endif // ASSERT
5602   }
5603 }
5604 
5605 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5606   if (_klass != NULL) {
5607     return _klass;
5608   }
5609 
5610   InstanceKlass* const ik =
5611     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5612 
5613   fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5614 
5615   assert(_klass == ik, "invariant");
5616 
5617 
5618   if (ik->should_store_fingerprint()) {
5619     ik->store_fingerprint(_stream->compute_fingerprint());
5620   }
5621 
5622   ik->set_has_passed_fingerprint_check(false);
5623   if (UseAOT && ik->supers_have_passed_fingerprint_checks()) {
5624     uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik);
5625     uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint();
5626     if (aot_fp != 0 && aot_fp == fp) {
5627       // This class matches with a class saved in an AOT library
5628       ik->set_has_passed_fingerprint_check(true);
5629     } else {
5630       ResourceMark rm;
5631       log_info(class, fingerprint)("%s :  expected = " PTR64_FORMAT " actual = " PTR64_FORMAT,
5632                                  ik->external_name(), aot_fp, _stream->compute_fingerprint());
5633     }
5634   }
5635 
5636   return ik;
5637 }
5638 
5639 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5640   assert(ik != NULL, "invariant");
5641 
5642   // Set name and CLD before adding to CLD
5643   ik->set_class_loader_data(_loader_data);
5644   ik->set_name(_class_name);
5645 
5646   // Add all classes to our internal class loader list here,
5647   // including classes in the bootstrap (NULL) class loader.
5648   const bool publicize = !is_internal();
5649 
5650   _loader_data->add_class(ik, publicize);
5651 
5652   set_klass_to_deallocate(ik);
5653 
5654   assert(_field_info != NULL, "invariant");
5655   assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5656   assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5657     "sanity");
5658 
5659   assert(ik->is_instance_klass(), "sanity");
5660   assert(ik->size_helper() == _field_info->instance_size, "sanity");
5661 
5662   // Fill in information already parsed
5663   ik->set_should_verify_class(_need_verify);
5664 
5665   // Not yet: supers are done below to support the new subtype-checking fields
5666   ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5667   ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5668   assert(_fac != NULL, "invariant");
5669   ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5670 
5671   // this transfers ownership of a lot of arrays from
5672   // the parser onto the InstanceKlass*
5673   apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5674 
5675   // note that is not safe to use the fields in the parser from this point on
5676   assert(NULL == _cp, "invariant");
5677   assert(NULL == _fields, "invariant");
5678   assert(NULL == _methods, "invariant");
5679   assert(NULL == _inner_classes, "invariant");
5680   assert(NULL == _nest_members, "invariant");
5681   assert(NULL == _local_interfaces, "invariant");
5682   assert(NULL == _combined_annotations, "invariant");
5683   assert(NULL == _record_components, "invariant");
5684 
5685   if (_has_final_method) {
5686     ik->set_has_final_method();
5687   }
5688 
5689   ik->copy_method_ordering(_method_ordering, CHECK);
5690   // The InstanceKlass::_methods_jmethod_ids cache
5691   // is managed on the assumption that the initial cache
5692   // size is equal to the number of methods in the class. If
5693   // that changes, then InstanceKlass::idnum_can_increment()
5694   // has to be changed accordingly.
5695   ik->set_initial_method_idnum(ik->methods()->length());
5696 
5697   ik->set_this_class_index(_this_class_index);
5698 
5699   if (is_unsafe_anonymous()) {
5700     // _this_class_index is a CONSTANT_Class entry that refers to this
5701     // anonymous class itself. If this class needs to refer to its own methods or
5702     // fields, it would use a CONSTANT_MethodRef, etc, which would reference
5703     // _this_class_index. However, because this class is anonymous (it's
5704     // not stored in SystemDictionary), _this_class_index cannot be resolved
5705     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5706     // Therefore, we must eagerly resolve _this_class_index now.
5707     ik->constants()->klass_at_put(_this_class_index, ik);
5708   }
5709 
5710   ik->set_minor_version(_minor_version);
5711   ik->set_major_version(_major_version);
5712   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5713   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5714 
5715   if (_unsafe_anonymous_host != NULL) {
5716     assert (ik->is_unsafe_anonymous(), "should be the same");
5717     ik->set_unsafe_anonymous_host(_unsafe_anonymous_host);
5718   }
5719 
5720   // Set PackageEntry for this_klass
5721   oop cl = ik->class_loader();
5722   Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5723   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5724   ik->set_package(cld, CHECK);
5725 
5726   const Array<Method*>* const methods = ik->methods();
5727   assert(methods != NULL, "invariant");
5728   const int methods_len = methods->length();
5729 
5730   check_methods_for_intrinsics(ik, methods);
5731 
5732   // Fill in field values obtained by parse_classfile_attributes
5733   if (_parsed_annotations->has_any_annotations()) {
5734     _parsed_annotations->apply_to(ik);
5735   }
5736 
5737   apply_parsed_class_attributes(ik);
5738 
5739   // Miranda methods
5740   if ((_num_miranda_methods > 0) ||
5741       // if this class introduced new miranda methods or
5742       (_super_klass != NULL && _super_klass->has_miranda_methods())
5743         // super class exists and this class inherited miranda methods
5744      ) {
5745        ik->set_has_miranda_methods(); // then set a flag
5746   }
5747 
5748   // Fill in information needed to compute superclasses.
5749   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5750   ik->set_transitive_interfaces(_transitive_interfaces);
5751   _transitive_interfaces = NULL;
5752 
5753   // Initialize itable offset tables
5754   klassItable::setup_itable_offset_table(ik);
5755 
5756   // Compute transitive closure of interfaces this class implements
5757   // Do final class setup
5758   fill_oop_maps(ik,
5759                 _field_info->nonstatic_oop_map_count,
5760                 _field_info->nonstatic_oop_offsets,
5761                 _field_info->nonstatic_oop_counts);
5762 
5763   // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5764   set_precomputed_flags(ik);
5765 
5766   // check if this class can access its super class
5767   check_super_class_access(ik, CHECK);
5768 
5769   // check if this class can access its superinterfaces
5770   check_super_interface_access(ik, CHECK);
5771 
5772   // check if this class overrides any final method
5773   check_final_method_override(ik, CHECK);
5774 
5775   // reject static interface methods prior to Java 8
5776   if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5777     check_illegal_static_method(ik, CHECK);
5778   }
5779 
5780   // Obtain this_klass' module entry
5781   ModuleEntry* module_entry = ik->module();
5782   assert(module_entry != NULL, "module_entry should always be set");
5783 
5784   // Obtain java.lang.Module
5785   Handle module_handle(THREAD, module_entry->module());
5786 
5787   // Allocate mirror and initialize static fields
5788   // The create_mirror() call will also call compute_modifiers()
5789   java_lang_Class::create_mirror(ik,
5790                                  Handle(THREAD, _loader_data->class_loader()), 
5791                                  module_handle,
5792                                  _protection_domain,
5793                                  CHECK);
5794 
5795   assert(_all_mirandas != NULL, "invariant");
5796 
5797   // Generate any default methods - default methods are public interface methods
5798   // that have a default implementation.  This is new with Java 8.
5799   if (_has_nonstatic_concrete_methods) {
5800     DefaultMethods::generate_default_methods(ik,
5801                                              _all_mirandas,
5802                                              CHECK);
5803   }
5804 
5805   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5806   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5807       !module_entry->has_default_read_edges()) {
5808     if (!module_entry->set_has_default_read_edges()) {
5809       // We won a potential race
5810       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5811     }
5812   }
5813 
5814   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5815 
5816   if (!is_internal()) {
5817     if (log_is_enabled(Info, class, load)) {
5818       ResourceMark rm;
5819       const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5820       ik->print_class_load_logging(_loader_data, module_name, _stream);
5821     }
5822 
5823     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5824         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5825         log_is_enabled(Info, class, preview)) {
5826       ResourceMark rm;
5827       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5828                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5829     }
5830 
5831     if (log_is_enabled(Debug, class, resolve))  {
5832       ResourceMark rm;
5833       // print out the superclass.
5834       const char * from = ik->external_name();
5835       if (ik->java_super() != NULL) {
5836         log_debug(class, resolve)("%s %s (super)",
5837                    from,
5838                    ik->java_super()->external_name());
5839       }
5840       // print out each of the interface classes referred to by this class.
5841       const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5842       if (local_interfaces != NULL) {
5843         const int length = local_interfaces->length();
5844         for (int i = 0; i < length; i++) {
5845           const InstanceKlass* const k = local_interfaces->at(i);
5846           const char * to = k->external_name();
5847           log_debug(class, resolve)("%s %s (interface)", from, to);
5848         }
5849       }
5850     }
5851   }
5852 
5853   JFR_ONLY(INIT_ID(ik);)
5854 
5855   // If we reach here, all is well.
5856   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5857   // in order for it to not be destroyed in the ClassFileParser destructor.
5858   set_klass_to_deallocate(NULL);
5859 
5860   // it's official
5861   set_klass(ik);
5862 
5863   debug_only(ik->verify();)
5864 }
5865 
5866 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5867   // Decrement the refcount in the old name, since we're clobbering it.
5868   _class_name->decrement_refcount();
5869 
5870   _class_name = new_class_name;
5871   // Increment the refcount of the new name.
5872   // Now the ClassFileParser owns this name and will decrement in
5873   // the destructor.
5874   _class_name->increment_refcount();
5875 }
5876 
5877 
5878 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's
5879 // package by prepending its host class's package name to its class name and setting
5880 // its _class_name field.
5881 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) {
5882   ResourceMark rm(THREAD);
5883   assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL,
5884          "Unsafe anonymous class should not be in a package");
5885   const char* host_pkg_name =
5886     ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL);
5887 
5888   if (host_pkg_name != NULL) {
5889     int host_pkg_len = (int)strlen(host_pkg_name);
5890     int class_name_len = _class_name->utf8_length();
5891     int symbol_len = host_pkg_len + 1 + class_name_len;
5892     char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1);
5893     int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s",
5894                          host_pkg_name, class_name_len, _class_name->base());
5895     assert(n == symbol_len, "Unexpected number of characters in string");
5896 
5897     // Decrement old _class_name to avoid leaking.
5898     _class_name->decrement_refcount();
5899 
5900     // Create a symbol and update the anonymous class name.
5901     // The new class name is created with a refcount of one. When installed into the InstanceKlass,
5902     // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted
5903     // when the class is unloaded.
5904     _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len);
5905   }
5906 }
5907 
5908 // If the host class and the anonymous class are in the same package then do
5909 // nothing.  If the anonymous class is in the unnamed package then move it to its
5910 // host's package.  If the classes are in different packages then throw an IAE
5911 // exception.
5912 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) {
5913   assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class");
5914 
5915   const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(),
5916                                                _class_name->utf8_length(), JVM_SIGNATURE_SLASH);
5917   if (anon_last_slash == NULL) {  // Unnamed package
5918     prepend_host_package_name(_unsafe_anonymous_host, CHECK);
5919   } else {
5920     if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) {
5921       ResourceMark rm(THREAD);
5922       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5923         err_msg("Host class %s and anonymous class %s are in different packages",
5924         _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string()));
5925     }
5926   }
5927 }
5928 
5929 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5930   bool trusted = (loader_data->is_the_null_class_loader_data() ||
5931                   SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5932   bool need_verify =
5933     // verifyAll
5934     (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5935     // verifyRemote
5936     (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5937   return !need_verify;
5938 }
5939 
5940 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5941                                  Symbol* name,
5942                                  ClassLoaderData* loader_data,
5943                                  Handle protection_domain,
5944                                  const InstanceKlass* unsafe_anonymous_host,
5945                                  GrowableArray<Handle>* cp_patches,
5946                                  Publicity pub_level,
5947                                  TRAPS) :
5948   _stream(stream),
5949   _requested_name(name),
5950   _class_name(NULL),
5951   _loader_data(loader_data),
5952   _unsafe_anonymous_host(unsafe_anonymous_host),
5953   _cp_patches(cp_patches),
5954   _num_patched_klasses(0),
5955   _max_num_patched_klasses(0),
5956   _orig_cp_size(0),
5957   _first_patched_klass_resolved_index(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   _record_components(NULL),
5966   _local_interfaces(NULL),
5967   _transitive_interfaces(NULL),
5968   _combined_annotations(NULL),
5969   _class_annotations(NULL),
5970   _class_type_annotations(NULL),
5971   _fields_annotations(NULL),
5972   _fields_type_annotations(NULL),
5973   _klass(NULL),
5974   _klass_to_deallocate(NULL),
5975   _parsed_annotations(NULL),
5976   _fac(NULL),
5977   _field_info(NULL),
5978   _method_ordering(NULL),
5979   _all_mirandas(NULL),
5980   _vtable_size(0),
5981   _itable_size(0),
5982   _num_miranda_methods(0),
5983   _rt(REF_NONE),
5984   _protection_domain(protection_domain),
5985   _access_flags(),
5986   _pub_level(pub_level),
5987   _bad_constant_seen(0),
5988   _synthetic_flag(false),
5989   _sde_length(false),
5990   _sde_buffer(NULL),
5991   _sourcefile_index(0),
5992   _generic_signature_index(0),
5993   _major_version(0),
5994   _minor_version(0),
5995   _this_class_index(0),
5996   _super_class_index(0),
5997   _itfs_len(0),
5998   _java_fields_count(0),
5999   _need_verify(false),
6000   _relax_verify(false),
6001   _has_nonstatic_concrete_methods(false),
6002   _declares_nonstatic_concrete_methods(false),
6003   _has_final_method(false),
6004   _has_finalizer(false),
6005   _has_empty_finalizer(false),
6006   _has_vanilla_constructor(false),
6007   _max_bootstrap_specifier_index(-1) {
6008 
6009   _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6010   _class_name->increment_refcount();
6011 
6012   assert(THREAD->is_Java_thread(), "invariant");
6013   assert(_loader_data != NULL, "invariant");
6014   assert(stream != NULL, "invariant");
6015   assert(_stream != NULL, "invariant");
6016   assert(_stream->buffer() == _stream->current(), "invariant");
6017   assert(_class_name != NULL, "invariant");
6018   assert(0 == _access_flags.as_int(), "invariant");
6019 
6020   // Figure out whether we can skip format checking (matching classic VM behavior)
6021   if (DumpSharedSpaces) {
6022     // verify == true means it's a 'remote' class (i.e., non-boot class)
6023     // Verification decision is based on BytecodeVerificationRemote flag
6024     // for those classes.
6025     _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
6026                                               BytecodeVerificationLocal;
6027   }
6028   else {
6029     _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
6030                                                stream->need_verify());
6031   }
6032   if (_cp_patches != NULL) {
6033     int len = _cp_patches->length();
6034     for (int i=0; i<len; i++) {
6035       if (has_cp_patch_at(i)) {
6036         Handle patch = cp_patch_at(i);
6037         if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) {
6038           // We need to append the names of the patched classes to the end of the constant pool,
6039           // because a patched class may have a Utf8 name that's not already included in the
6040           // original constant pool. These class names are used when patch_constant_pool()
6041           // calls patch_class().
6042           //
6043           // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class.
6044           // At this point, we don't know the tag for index i yet, because we haven't parsed the
6045           // constant pool. So we can only assume the worst -- every String is used to patch a Class.
6046           _max_num_patched_klasses++;
6047         }
6048       }
6049     }
6050   }
6051 
6052   // synch back verification state to stream
6053   stream->set_verify(_need_verify);
6054 
6055   // Check if verification needs to be relaxed for this class file
6056   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6057   _relax_verify = relax_format_check_for(_loader_data);
6058 
6059   parse_stream(stream, CHECK);
6060 
6061   post_process_parsed_stream(stream, _cp, CHECK);
6062 }
6063 
6064 void ClassFileParser::clear_class_metadata() {
6065   // metadata created before the instance klass is created.  Must be
6066   // deallocated if classfile parsing returns an error.
6067   _cp = NULL;
6068   _fields = NULL;
6069   _methods = NULL;
6070   _inner_classes = NULL;
6071   _nest_members = NULL;
6072   _local_interfaces = NULL;
6073   _combined_annotations = NULL;
6074   _class_annotations = _class_type_annotations = NULL;
6075   _fields_annotations = _fields_type_annotations = NULL;
6076   _record_components = NULL;
6077 }
6078 
6079 // Destructor to clean up
6080 ClassFileParser::~ClassFileParser() {
6081   _class_name->decrement_refcount();
6082 
6083   if (_cp != NULL) {
6084     MetadataFactory::free_metadata(_loader_data, _cp);
6085   }
6086   if (_fields != NULL) {
6087     MetadataFactory::free_array<u2>(_loader_data, _fields);
6088   }
6089 
6090   if (_methods != NULL) {
6091     // Free methods
6092     InstanceKlass::deallocate_methods(_loader_data, _methods);
6093   }
6094 
6095   // beware of the Universe::empty_blah_array!!
6096   if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6097     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6098   }
6099 
6100   if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6101     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6102   }
6103 
6104   if (_record_components != NULL) {
6105     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6106   }
6107 
6108   // Free interfaces
6109   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6110                                        _local_interfaces, _transitive_interfaces);
6111 
6112   if (_combined_annotations != NULL) {
6113     // After all annotations arrays have been created, they are installed into the
6114     // Annotations object that will be assigned to the InstanceKlass being created.
6115 
6116     // Deallocate the Annotations object and the installed annotations arrays.
6117     _combined_annotations->deallocate_contents(_loader_data);
6118 
6119     // If the _combined_annotations pointer is non-NULL,
6120     // then the other annotations fields should have been cleared.
6121     assert(_class_annotations       == NULL, "Should have been cleared");
6122     assert(_class_type_annotations  == NULL, "Should have been cleared");
6123     assert(_fields_annotations      == NULL, "Should have been cleared");
6124     assert(_fields_type_annotations == NULL, "Should have been cleared");
6125   } else {
6126     // If the annotations arrays were not installed into the Annotations object,
6127     // then they have to be deallocated explicitly.
6128     MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
6129     MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
6130     Annotations::free_contents(_loader_data, _fields_annotations);
6131     Annotations::free_contents(_loader_data, _fields_type_annotations);
6132   }
6133 
6134   clear_class_metadata();
6135   _transitive_interfaces = NULL;
6136 
6137   // deallocate the klass if already created.  Don't directly deallocate, but add
6138   // to the deallocate list so that the klass is removed from the CLD::_klasses list
6139   // at a safepoint.
6140   if (_klass_to_deallocate != NULL) {
6141     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
6142   }
6143 }
6144 
6145 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
6146                                    TRAPS) {
6147 
6148   assert(stream != NULL, "invariant");
6149   assert(_class_name != NULL, "invariant");
6150 
6151   // BEGIN STREAM PARSING
6152   stream->guarantee_more(8, CHECK);  // magic, major, minor
6153   // Magic value
6154   const u4 magic = stream->get_u4_fast();
6155   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
6156                      "Incompatible magic value %u in class file %s",
6157                      magic, CHECK);
6158 
6159   // Version numbers
6160   _minor_version = stream->get_u2_fast();
6161   _major_version = stream->get_u2_fast();
6162 
6163   if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) {
6164     ResourceMark rm;
6165     warning("Pre JDK 6 class not supported by CDS: %u.%u %s",
6166             _major_version,  _minor_version, _class_name->as_C_string());
6167     Exceptions::fthrow(
6168       THREAD_AND_LOCATION,
6169       vmSymbols::java_lang_UnsupportedClassVersionError(),
6170       "Unsupported major.minor version for dump time %u.%u",
6171       _major_version,
6172       _minor_version);
6173   }
6174 
6175   // Check version numbers - we check this even with verifier off
6176   verify_class_version(_major_version, _minor_version, _class_name, CHECK);
6177 
6178   stream->guarantee_more(3, CHECK); // length, first cp tag
6179   u2 cp_size = stream->get_u2_fast();
6180 
6181   guarantee_property(
6182     cp_size >= 1, "Illegal constant pool size %u in class file %s",
6183     cp_size, CHECK);
6184 
6185   _orig_cp_size = cp_size;
6186   if (int(cp_size) + _max_num_patched_klasses > 0xffff) {
6187     THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes");
6188   }
6189   cp_size += _max_num_patched_klasses;
6190 
6191   _cp = ConstantPool::allocate(_loader_data,
6192                                cp_size,
6193                                CHECK);
6194 
6195   ConstantPool* const cp = _cp;
6196 
6197   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6198 
6199   assert(cp_size == (const u2)cp->length(), "invariant");
6200 
6201   // ACCESS FLAGS
6202   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
6203 
6204   // Access flags
6205   jint flags;
6206   // JVM_ACC_MODULE is defined in JDK-9 and later.
6207   if (_major_version >= JAVA_9_VERSION) {
6208     flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
6209   } else {
6210     flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
6211   }
6212 
6213   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6214     // Set abstract bit for old class files for backward compatibility
6215     flags |= JVM_ACC_ABSTRACT;
6216   }
6217 
6218   verify_legal_class_modifiers(flags, CHECK);
6219 
6220   short bad_constant = class_bad_constant_seen();
6221   if (bad_constant != 0) {
6222     // Do not throw CFE until after the access_flags are checked because if
6223     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6224     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK);
6225   }
6226 
6227   _access_flags.set_flags(flags);
6228 
6229   // This class and superclass
6230   _this_class_index = stream->get_u2_fast();
6231   check_property(
6232     valid_cp_range(_this_class_index, cp_size) &&
6233       cp->tag_at(_this_class_index).is_unresolved_klass(),
6234     "Invalid this class index %u in constant pool in class file %s",
6235     _this_class_index, CHECK);
6236 
6237   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6238   assert(class_name_in_cp != NULL, "class_name can't be null");
6239 
6240   // Update _class_name to reflect the name in the constant pool
6241   update_class_name(class_name_in_cp);
6242 
6243   // Don't need to check whether this class name is legal or not.
6244   // It has been checked when constant pool is parsed.
6245   // However, make sure it is not an array type.
6246   if (_need_verify) {
6247     guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY,
6248                        "Bad class name in class file %s",
6249                        CHECK);
6250   }
6251 
6252   // Checks if name in class file matches requested name
6253   if (_requested_name != NULL && _requested_name != _class_name) {
6254     ResourceMark rm(THREAD);
6255     Exceptions::fthrow(
6256       THREAD_AND_LOCATION,
6257       vmSymbols::java_lang_NoClassDefFoundError(),
6258       "%s (wrong name: %s)",
6259       _class_name->as_C_string(),
6260       _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
6261     );
6262     return;
6263   }
6264 
6265   // if this is an anonymous class fix up its name if it's in the unnamed
6266   // package.  Otherwise, throw IAE if it is in a different package than
6267   // its host class.
6268   if (_unsafe_anonymous_host != NULL) {
6269     fix_unsafe_anonymous_class_name(CHECK);
6270   }
6271 
6272   // Verification prevents us from creating names with dots in them, this
6273   // asserts that that's the case.
6274   assert(is_internal_format(_class_name), "external class name format used internally");
6275 
6276   if (!is_internal()) {
6277     LogTarget(Debug, class, preorder) lt;
6278     if (lt.is_enabled()){
6279       ResourceMark rm(THREAD);
6280       LogStream ls(lt);
6281       ls.print("%s", _class_name->as_klass_external_name());
6282       if (stream->source() != NULL) {
6283         ls.print(" source: %s", stream->source());
6284       }
6285       ls.cr();
6286     }
6287 
6288 #if INCLUDE_CDS
6289     if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
6290       if (!ClassLoader::has_jrt_entry()) {
6291         warning("DumpLoadedClassList and CDS are not supported in exploded build");
6292         DumpLoadedClassList = NULL;
6293       } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
6294                  _unsafe_anonymous_host == NULL) {
6295         // Only dump the classes that can be stored into CDS archive.
6296         // Unsafe anonymous classes such as generated LambdaForm classes are also not included.
6297         oop class_loader = _loader_data->class_loader();
6298         ResourceMark rm(THREAD);
6299         bool skip = false;
6300         if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
6301           // For the boot and platform class loaders, skip classes that are not found in the
6302           // java runtime image, such as those found in the --patch-module entries.
6303           // These classes can't be loaded from the archive during runtime.
6304           if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
6305             skip = true;
6306           }
6307 
6308           if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
6309             // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
6310             // as they can be loaded from the archive during runtime.
6311             skip = false;
6312           }
6313         }
6314         if (skip) {
6315           tty->print_cr("skip writing class %s from source %s to classlist file",
6316             _class_name->as_C_string(), stream->source());
6317         } else {
6318           classlist_file->print_cr("%s", _class_name->as_C_string());
6319           classlist_file->flush();
6320         }
6321       }
6322     }
6323 #endif
6324   }
6325 
6326   // SUPERKLASS
6327   _super_class_index = stream->get_u2_fast();
6328   _super_klass = parse_super_class(cp,
6329                                    _super_class_index,
6330                                    _need_verify,
6331                                    CHECK);
6332 
6333   // Interfaces
6334   _itfs_len = stream->get_u2_fast();
6335   parse_interfaces(stream,
6336                    _itfs_len,
6337                    cp,
6338                    &_has_nonstatic_concrete_methods,
6339                    CHECK);
6340 
6341   assert(_local_interfaces != NULL, "invariant");
6342 
6343   // Fields (offsets are filled in later)
6344   _fac = new FieldAllocationCount();
6345   parse_fields(stream,
6346                _access_flags.is_interface(),
6347                _fac,
6348                cp,
6349                cp_size,
6350                &_java_fields_count,
6351                CHECK);
6352 
6353   assert(_fields != NULL, "invariant");
6354 
6355   // Methods
6356   AccessFlags promoted_flags;
6357   parse_methods(stream,
6358                 _access_flags.is_interface(),
6359                 &promoted_flags,
6360                 &_has_final_method,
6361                 &_declares_nonstatic_concrete_methods,
6362                 CHECK);
6363 
6364   assert(_methods != NULL, "invariant");
6365 
6366   // promote flags from parse_methods() to the klass' flags
6367   _access_flags.add_promoted_flags(promoted_flags.as_int());
6368 
6369   if (_declares_nonstatic_concrete_methods) {
6370     _has_nonstatic_concrete_methods = true;
6371   }
6372 
6373   // Additional attributes/annotations
6374   _parsed_annotations = new ClassAnnotationCollector();
6375   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6376 
6377   assert(_inner_classes != NULL, "invariant");
6378 
6379   // Finalize the Annotations metadata object,
6380   // now that all annotation arrays have been created.
6381   create_combined_annotations(CHECK);
6382 
6383   // Make sure this is the end of class file stream
6384   guarantee_property(stream->at_eos(),
6385                      "Extra bytes at the end of class file %s",
6386                      CHECK);
6387 
6388   // all bytes in stream read and parsed
6389 }
6390 
6391 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6392                                                  ConstantPool* cp,
6393                                                  TRAPS) {
6394   assert(stream != NULL, "invariant");
6395   assert(stream->at_eos(), "invariant");
6396   assert(cp != NULL, "invariant");
6397   assert(_loader_data != NULL, "invariant");
6398 
6399   if (_class_name == vmSymbols::java_lang_Object()) {
6400     check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6401                    "java.lang.Object cannot implement an interface in class file %s",
6402                    CHECK);
6403   }
6404   // We check super class after class file is parsed and format is checked
6405   if (_super_class_index > 0 && NULL ==_super_klass) {
6406     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6407     if (_access_flags.is_interface()) {
6408       // Before attempting to resolve the superclass, check for class format
6409       // errors not checked yet.
6410       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6411         "Interfaces must have java.lang.Object as superclass in class file %s",
6412         CHECK);
6413     }
6414     Handle loader(THREAD, _loader_data->class_loader());
6415     _super_klass = (const InstanceKlass*)
6416                        SystemDictionary::resolve_super_or_fail(_class_name,
6417                                                                super_class_name,
6418                                                                loader,
6419                                                                _protection_domain,
6420                                                                true,
6421                                                                CHECK);
6422   }
6423 
6424   if (_super_klass != NULL) {
6425     if (_super_klass->has_nonstatic_concrete_methods()) {
6426       _has_nonstatic_concrete_methods = true;
6427     }
6428 
6429     if (_super_klass->is_interface()) {
6430       ResourceMark rm(THREAD);
6431       Exceptions::fthrow(
6432         THREAD_AND_LOCATION,
6433         vmSymbols::java_lang_IncompatibleClassChangeError(),
6434         "class %s has interface %s as super class",
6435         _class_name->as_klass_external_name(),
6436         _super_klass->external_name()
6437       );
6438       return;
6439     }
6440     // Make sure super class is not final
6441     if (_super_klass->is_final()) {
6442       THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
6443     }
6444   }
6445 
6446   // Compute the transitive list of all unique interfaces implemented by this class
6447   _transitive_interfaces =
6448     compute_transitive_interfaces(_super_klass,
6449                                   _local_interfaces,
6450                                   _loader_data,
6451                                   CHECK);
6452 
6453   assert(_transitive_interfaces != NULL, "invariant");
6454 
6455   // sort methods
6456   _method_ordering = sort_methods(_methods);
6457 
6458   _all_mirandas = new GrowableArray<Method*>(20);
6459 
6460   Handle loader(THREAD, _loader_data->class_loader());
6461   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6462                                                     &_num_miranda_methods,
6463                                                     _all_mirandas,
6464                                                     _super_klass,
6465                                                     _methods,
6466                                                     _access_flags,
6467                                                     _major_version,
6468                                                     loader,
6469                                                     _class_name,
6470                                                     _local_interfaces,
6471                                                     CHECK);
6472 
6473   // Size of Java itable (in words)
6474   _itable_size = _access_flags.is_interface() ? 0 :
6475     klassItable::compute_itable_size(_transitive_interfaces);
6476 
6477   assert(_fac != NULL, "invariant");
6478   assert(_parsed_annotations != NULL, "invariant");
6479 
6480   _field_info = new FieldLayoutInfo();
6481   layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
6482 
6483   // Compute reference typ
6484   _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6485 
6486 }
6487 
6488 void ClassFileParser::set_klass(InstanceKlass* klass) {
6489 
6490 #ifdef ASSERT
6491   if (klass != NULL) {
6492     assert(NULL == _klass, "leaking?");
6493   }
6494 #endif
6495 
6496   _klass = klass;
6497 }
6498 
6499 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6500 
6501 #ifdef ASSERT
6502   if (klass != NULL) {
6503     assert(NULL == _klass_to_deallocate, "leaking?");
6504   }
6505 #endif
6506 
6507   _klass_to_deallocate = klass;
6508 }
6509 
6510 // Caller responsible for ResourceMark
6511 // clone stream with rewound position
6512 const ClassFileStream* ClassFileParser::clone_stream() const {
6513   assert(_stream != NULL, "invariant");
6514 
6515   return _stream->clone();
6516 }
6517 // ----------------------------------------------------------------------------
6518 // debugging
6519 
6520 #ifdef ASSERT
6521 
6522 // return true if class_name contains no '.' (internal format is '/')
6523 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6524   if (class_name != NULL) {
6525     ResourceMark rm;
6526     char* name = class_name->as_C_string();
6527     return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6528   } else {
6529     return true;
6530   }
6531 }
6532 
6533 #endif