1 /*
   2  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_classFileParser.cpp.incl"
  27 
  28 // We generally try to create the oops directly when parsing, rather than allocating
  29 // temporary data structures and copying the bytes twice. A temporary area is only
  30 // needed when parsing utf8 entries in the constant pool and when parsing line number
  31 // tables.
  32 
  33 // We add assert in debug mode when class format is not checked.
  34 
  35 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
  36 #define JAVA_MIN_SUPPORTED_VERSION        45
  37 #define JAVA_MAX_SUPPORTED_VERSION        51
  38 #define JAVA_MAX_SUPPORTED_MINOR_VERSION  0
  39 
  40 // Used for two backward compatibility reasons:
  41 // - to check for new additions to the class file format in JDK1.5
  42 // - to check for bug fixes in the format checker in JDK1.5
  43 #define JAVA_1_5_VERSION                  49
  44 
  45 // Used for backward compatibility reasons:
  46 // - to check for javac bug fixes that happened after 1.5
  47 // - also used as the max version when running in jdk6
  48 #define JAVA_6_VERSION                    50
  49 
  50 
  51 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
  52   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
  53   // this function (_current can be allocated in a register, with scalar
  54   // replacement of aggregates). The _current pointer is copied back to
  55   // stream() when this function returns. DON'T call another method within
  56   // this method that uses stream().
  57   ClassFileStream* cfs0 = stream();
  58   ClassFileStream cfs1 = *cfs0;
  59   ClassFileStream* cfs = &cfs1;
  60 #ifdef ASSERT
  61   u1* old_current = cfs0->current();
  62 #endif
  63 
  64   // Used for batching symbol allocations.
  65   const char* names[SymbolTable::symbol_alloc_batch_size];
  66   int lengths[SymbolTable::symbol_alloc_batch_size];
  67   int indices[SymbolTable::symbol_alloc_batch_size];
  68   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
  69   int names_count = 0;
  70 
  71   // parsing  Index 0 is unused
  72   for (int index = 1; index < length; index++) {
  73     // Each of the following case guarantees one more byte in the stream
  74     // for the following tag or the access_flags following constant pool,
  75     // so we don't need bounds-check for reading tag.
  76     u1 tag = cfs->get_u1_fast();
  77     switch (tag) {
  78       case JVM_CONSTANT_Class :
  79         {
  80           cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
  81           u2 name_index = cfs->get_u2_fast();
  82           cp->klass_index_at_put(index, name_index);
  83         }
  84         break;
  85       case JVM_CONSTANT_Fieldref :
  86         {
  87           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
  88           u2 class_index = cfs->get_u2_fast();
  89           u2 name_and_type_index = cfs->get_u2_fast();
  90           cp->field_at_put(index, class_index, name_and_type_index);
  91         }
  92         break;
  93       case JVM_CONSTANT_Methodref :
  94         {
  95           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
  96           u2 class_index = cfs->get_u2_fast();
  97           u2 name_and_type_index = cfs->get_u2_fast();
  98           cp->method_at_put(index, class_index, name_and_type_index);
  99         }
 100         break;
 101       case JVM_CONSTANT_InterfaceMethodref :
 102         {
 103           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 104           u2 class_index = cfs->get_u2_fast();
 105           u2 name_and_type_index = cfs->get_u2_fast();
 106           cp->interface_method_at_put(index, class_index, name_and_type_index);
 107         }
 108         break;
 109       case JVM_CONSTANT_String :
 110         {
 111           cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 112           u2 string_index = cfs->get_u2_fast();
 113           cp->string_index_at_put(index, string_index);
 114         }
 115         break;
 116       case JVM_CONSTANT_Integer :
 117         {
 118           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 119           u4 bytes = cfs->get_u4_fast();
 120           cp->int_at_put(index, (jint) bytes);
 121         }
 122         break;
 123       case JVM_CONSTANT_Float :
 124         {
 125           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 126           u4 bytes = cfs->get_u4_fast();
 127           cp->float_at_put(index, *(jfloat*)&bytes);
 128         }
 129         break;
 130       case JVM_CONSTANT_Long :
 131         // A mangled type might cause you to overrun allocated memory
 132         guarantee_property(index+1 < length,
 133                            "Invalid constant pool entry %u in class file %s",
 134                            index, CHECK);
 135         {
 136           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 137           u8 bytes = cfs->get_u8_fast();
 138           cp->long_at_put(index, bytes);
 139         }
 140         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 141         break;
 142       case JVM_CONSTANT_Double :
 143         // A mangled type might cause you to overrun allocated memory
 144         guarantee_property(index+1 < length,
 145                            "Invalid constant pool entry %u in class file %s",
 146                            index, CHECK);
 147         {
 148           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 149           u8 bytes = cfs->get_u8_fast();
 150           cp->double_at_put(index, *(jdouble*)&bytes);
 151         }
 152         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 153         break;
 154       case JVM_CONSTANT_NameAndType :
 155         {
 156           cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 157           u2 name_index = cfs->get_u2_fast();
 158           u2 signature_index = cfs->get_u2_fast();
 159           cp->name_and_type_at_put(index, name_index, signature_index);
 160         }
 161         break;
 162       case JVM_CONSTANT_Utf8 :
 163         {
 164           cfs->guarantee_more(2, CHECK);  // utf8_length
 165           u2  utf8_length = cfs->get_u2_fast();
 166           u1* utf8_buffer = cfs->get_u1_buffer();
 167           assert(utf8_buffer != NULL, "null utf8 buffer");
 168           // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 169           cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 170           cfs->skip_u1_fast(utf8_length);
 171 
 172           // Before storing the symbol, make sure it's legal
 173           if (_need_verify) {
 174             verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
 175           }
 176 
 177           if (AnonymousClasses && has_cp_patch_at(index)) {
 178             Handle patch = clear_cp_patch_at(index);
 179             guarantee_property(java_lang_String::is_instance(patch()),
 180                                "Illegal utf8 patch at %d in class file %s",
 181                                index, CHECK);
 182             char* str = java_lang_String::as_utf8_string(patch());
 183             // (could use java_lang_String::as_symbol instead, but might as well batch them)
 184             utf8_buffer = (u1*) str;
 185             utf8_length = (int) strlen(str);
 186           }
 187 
 188           unsigned int hash;
 189           symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
 190           if (result == NULL) {
 191             names[names_count] = (char*)utf8_buffer;
 192             lengths[names_count] = utf8_length;
 193             indices[names_count] = index;
 194             hashValues[names_count++] = hash;
 195             if (names_count == SymbolTable::symbol_alloc_batch_size) {
 196               oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
 197               names_count = 0;
 198             }
 199           } else {
 200             cp->symbol_at_put(index, result);
 201           }
 202         }
 203         break;
 204       default:
 205         classfile_parse_error(
 206           "Unknown constant tag %u in class file %s", tag, CHECK);
 207         break;
 208     }
 209   }
 210 
 211   // Allocate the remaining symbols
 212   if (names_count > 0) {
 213     oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
 214   }
 215 
 216   // Copy _current pointer of local copy back to stream().
 217 #ifdef ASSERT
 218   assert(cfs0->current() == old_current, "non-exclusive use of stream()");
 219 #endif
 220   cfs0->set_current(cfs1.current());
 221 }
 222 
 223 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
 224 
 225 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
 226   ClassFileStream* cfs = stream();
 227   constantPoolHandle nullHandle;
 228 
 229   cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
 230   u2 length = cfs->get_u2_fast();
 231   guarantee_property(
 232     length >= 1, "Illegal constant pool size %u in class file %s",
 233     length, CHECK_(nullHandle));
 234   constantPoolOop constant_pool =
 235                       oopFactory::new_constantPool(length,
 236                                                    methodOopDesc::IsSafeConc,
 237                                                    CHECK_(nullHandle));
 238   constantPoolHandle cp (THREAD, constant_pool);
 239 
 240   cp->set_partially_loaded();    // Enables heap verify to work on partial constantPoolOops
 241 
 242   // parsing constant pool entries
 243   parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
 244 
 245   int index = 1;  // declared outside of loops for portability
 246 
 247   // first verification pass - validate cross references and fixup class and string constants
 248   for (index = 1; index < length; index++) {          // Index 0 is unused
 249     switch (cp->tag_at(index).value()) {
 250       case JVM_CONSTANT_Class :
 251         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 252         break;
 253       case JVM_CONSTANT_Fieldref :
 254         // fall through
 255       case JVM_CONSTANT_Methodref :
 256         // fall through
 257       case JVM_CONSTANT_InterfaceMethodref : {
 258         if (!_need_verify) break;
 259         int klass_ref_index = cp->klass_ref_index_at(index);
 260         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 261         check_property(valid_cp_range(klass_ref_index, length) &&
 262                        is_klass_reference(cp, klass_ref_index),
 263                        "Invalid constant pool index %u in class file %s",
 264                        klass_ref_index,
 265                        CHECK_(nullHandle));
 266         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 267                        cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 268                        "Invalid constant pool index %u in class file %s",
 269                        name_and_type_ref_index,
 270                        CHECK_(nullHandle));
 271         break;
 272       }
 273       case JVM_CONSTANT_String :
 274         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 275         break;
 276       case JVM_CONSTANT_Integer :
 277         break;
 278       case JVM_CONSTANT_Float :
 279         break;
 280       case JVM_CONSTANT_Long :
 281       case JVM_CONSTANT_Double :
 282         index++;
 283         check_property(
 284           (index < length && cp->tag_at(index).is_invalid()),
 285           "Improper constant pool long/double index %u in class file %s",
 286           index, CHECK_(nullHandle));
 287         break;
 288       case JVM_CONSTANT_NameAndType : {
 289         if (!_need_verify) break;
 290         int name_ref_index = cp->name_ref_index_at(index);
 291         int signature_ref_index = cp->signature_ref_index_at(index);
 292         check_property(
 293           valid_cp_range(name_ref_index, length) &&
 294             cp->tag_at(name_ref_index).is_utf8(),
 295           "Invalid constant pool index %u in class file %s",
 296           name_ref_index, CHECK_(nullHandle));
 297         check_property(
 298           valid_cp_range(signature_ref_index, length) &&
 299             cp->tag_at(signature_ref_index).is_utf8(),
 300           "Invalid constant pool index %u in class file %s",
 301           signature_ref_index, CHECK_(nullHandle));
 302         break;
 303       }
 304       case JVM_CONSTANT_Utf8 :
 305         break;
 306       case JVM_CONSTANT_UnresolvedClass :         // fall-through
 307       case JVM_CONSTANT_UnresolvedClassInError:
 308         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 309         break;
 310       case JVM_CONSTANT_ClassIndex :
 311         {
 312           int class_index = cp->klass_index_at(index);
 313           check_property(
 314             valid_cp_range(class_index, length) &&
 315               cp->tag_at(class_index).is_utf8(),
 316             "Invalid constant pool index %u in class file %s",
 317             class_index, CHECK_(nullHandle));
 318           cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
 319         }
 320         break;
 321       case JVM_CONSTANT_UnresolvedString :
 322         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 323         break;
 324       case JVM_CONSTANT_StringIndex :
 325         {
 326           int string_index = cp->string_index_at(index);
 327           check_property(
 328             valid_cp_range(string_index, length) &&
 329               cp->tag_at(string_index).is_utf8(),
 330             "Invalid constant pool index %u in class file %s",
 331             string_index, CHECK_(nullHandle));
 332           symbolOop sym = cp->symbol_at(string_index);
 333           cp->unresolved_string_at_put(index, sym);
 334         }
 335         break;
 336       default:
 337         fatal1("bad constant pool tag value %u", cp->tag_at(index).value());
 338         ShouldNotReachHere();
 339         break;
 340     } // end of switch
 341   } // end of for
 342 
 343   if (_cp_patches != NULL) {
 344     // need to treat this_class specially...
 345     assert(AnonymousClasses, "");
 346     int this_class_index;
 347     {
 348       cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
 349       u1* mark = cfs->current();
 350       u2 flags         = cfs->get_u2_fast();
 351       this_class_index = cfs->get_u2_fast();
 352       cfs->set_current(mark);  // revert to mark
 353     }
 354 
 355     for (index = 1; index < length; index++) {          // Index 0 is unused
 356       if (has_cp_patch_at(index)) {
 357         guarantee_property(index != this_class_index,
 358                            "Illegal constant pool patch to self at %d in class file %s",
 359                            index, CHECK_(nullHandle));
 360         patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
 361       }
 362     }
 363     // Ensure that all the patches have been used.
 364     for (index = 0; index < _cp_patches->length(); index++) {
 365       guarantee_property(!has_cp_patch_at(index),
 366                          "Unused constant pool patch at %d in class file %s",
 367                          index, CHECK_(nullHandle));
 368     }
 369   }
 370 
 371   if (!_need_verify) {
 372     return cp;
 373   }
 374 
 375   // second verification pass - checks the strings are of the right format.
 376   // but not yet to the other entries
 377   for (index = 1; index < length; index++) {
 378     jbyte tag = cp->tag_at(index).value();
 379     switch (tag) {
 380       case JVM_CONSTANT_UnresolvedClass: {
 381         symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
 382         // check the name, even if _cp_patches will overwrite it
 383         verify_legal_class_name(class_name, CHECK_(nullHandle));
 384         break;
 385       }
 386       case JVM_CONSTANT_Fieldref:
 387       case JVM_CONSTANT_Methodref:
 388       case JVM_CONSTANT_InterfaceMethodref: {
 389         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 390         // already verified to be utf8
 391         int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 392         // already verified to be utf8
 393         int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
 394         symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
 395         symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
 396         if (tag == JVM_CONSTANT_Fieldref) {
 397           verify_legal_field_name(name, CHECK_(nullHandle));
 398           verify_legal_field_signature(name, signature, CHECK_(nullHandle));
 399         } else {
 400           verify_legal_method_name(name, CHECK_(nullHandle));
 401           verify_legal_method_signature(name, signature, CHECK_(nullHandle));
 402           if (tag == JVM_CONSTANT_Methodref) {
 403             // 4509014: If a class method name begins with '<', it must be "<init>".
 404             assert(!name.is_null(), "method name in constant pool is null");
 405             unsigned int name_len = name->utf8_length();
 406             assert(name_len > 0, "bad method name");  // already verified as legal name
 407             if (name->byte_at(0) == '<') {
 408               if (name() != vmSymbols::object_initializer_name()) {
 409                 classfile_parse_error(
 410                   "Bad method name at constant pool index %u in class file %s",
 411                   name_ref_index, CHECK_(nullHandle));
 412               }
 413             }
 414           }
 415         }
 416         break;
 417       }
 418     }  // end of switch
 419   }  // end of for
 420 
 421   return cp;
 422 }
 423 
 424 
 425 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
 426   assert(AnonymousClasses, "");
 427   BasicType patch_type = T_VOID;
 428   switch (cp->tag_at(index).value()) {
 429 
 430   case JVM_CONSTANT_UnresolvedClass :
 431     // Patching a class means pre-resolving it.
 432     // The name in the constant pool is ignored.
 433     if (patch->klass() == SystemDictionary::class_klass()) { // %%% java_lang_Class::is_instance
 434       guarantee_property(!java_lang_Class::is_primitive(patch()),
 435                          "Illegal class patch at %d in class file %s",
 436                          index, CHECK);
 437       cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
 438     } else {
 439       guarantee_property(java_lang_String::is_instance(patch()),
 440                          "Illegal class patch at %d in class file %s",
 441                          index, CHECK);
 442       symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
 443       cp->unresolved_klass_at_put(index, name());
 444     }
 445     break;
 446 
 447   case JVM_CONSTANT_UnresolvedString :
 448     // Patching a string means pre-resolving it.
 449     // The spelling in the constant pool is ignored.
 450     // The constant reference may be any object whatever.
 451     // If it is not a real interned string, the constant is referred
 452     // to as a "pseudo-string", and must be presented to the CP
 453     // explicitly, because it may require scavenging.
 454     cp->pseudo_string_at_put(index, patch());
 455     break;
 456 
 457   case JVM_CONSTANT_Integer : patch_type = T_INT;    goto patch_prim;
 458   case JVM_CONSTANT_Float :   patch_type = T_FLOAT;  goto patch_prim;
 459   case JVM_CONSTANT_Long :    patch_type = T_LONG;   goto patch_prim;
 460   case JVM_CONSTANT_Double :  patch_type = T_DOUBLE; goto patch_prim;
 461   patch_prim:
 462     {
 463       jvalue value;
 464       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 465       guarantee_property(value_type == patch_type,
 466                          "Illegal primitive patch at %d in class file %s",
 467                          index, CHECK);
 468       switch (value_type) {
 469       case T_INT:    cp->int_at_put(index,   value.i); break;
 470       case T_FLOAT:  cp->float_at_put(index, value.f); break;
 471       case T_LONG:   cp->long_at_put(index,  value.j); break;
 472       case T_DOUBLE: cp->double_at_put(index, value.d); break;
 473       default:       assert(false, "");
 474       }
 475     }
 476     break;
 477 
 478   default:
 479     // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 480     guarantee_property(!has_cp_patch_at(index),
 481                        "Illegal unexpected patch at %d in class file %s",
 482                        index, CHECK);
 483     return;
 484   }
 485 
 486   // On fall-through, mark the patch as used.
 487   clear_cp_patch_at(index);
 488 }
 489 
 490 
 491 
 492 class NameSigHash: public ResourceObj {
 493  public:
 494   symbolOop     _name;       // name
 495   symbolOop     _sig;        // signature
 496   NameSigHash*  _next;       // Next entry in hash table
 497 };
 498 
 499 
 500 #define HASH_ROW_SIZE 256
 501 
 502 unsigned int hash(symbolOop name, symbolOop sig) {
 503   unsigned int raw_hash = 0;
 504   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 505   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 506 
 507   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 508 }
 509 
 510 
 511 void initialize_hashtable(NameSigHash** table) {
 512   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 513 }
 514 
 515 // Return false if the name/sig combination is found in table.
 516 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 517 // The old format checker uses heap sort to find duplicates.
 518 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 519 // of table since we don't expect symbolOop's to move.
 520 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
 521   assert(name != NULL, "name in constant pool is NULL");
 522 
 523   // First lookup for duplicates
 524   int index = hash(name, sig);
 525   NameSigHash* entry = table[index];
 526   while (entry != NULL) {
 527     if (entry->_name == name && entry->_sig == sig) {
 528       return false;
 529     }
 530     entry = entry->_next;
 531   }
 532 
 533   // No duplicate is found, allocate a new entry and fill it.
 534   entry = new NameSigHash();
 535   entry->_name = name;
 536   entry->_sig = sig;
 537 
 538   // Insert into hash table
 539   entry->_next = table[index];
 540   table[index] = entry;
 541 
 542   return true;
 543 }
 544 
 545 
 546 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
 547                                                  int length,
 548                                                  Handle class_loader,
 549                                                  Handle protection_domain,
 550                                                  symbolHandle class_name,
 551                                                  TRAPS) {
 552   ClassFileStream* cfs = stream();
 553   assert(length > 0, "only called for length>0");
 554   objArrayHandle nullHandle;
 555   objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
 556   objArrayHandle interfaces (THREAD, interface_oop);
 557 
 558   int index;
 559   for (index = 0; index < length; index++) {
 560     u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
 561     KlassHandle interf;
 562     check_property(
 563       valid_cp_range(interface_index, cp->length()) &&
 564       is_klass_reference(cp, interface_index),
 565       "Interface name has bad constant pool index %u in class file %s",
 566       interface_index, CHECK_(nullHandle));
 567     if (cp->tag_at(interface_index).is_klass()) {
 568       interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
 569     } else {
 570       symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
 571 
 572       // Don't need to check legal name because it's checked when parsing constant pool.
 573       // But need to make sure it's not an array type.
 574       guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 575                          "Bad interface name in class file %s", CHECK_(nullHandle));
 576 
 577       // Call resolve_super so classcircularity is checked
 578       klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
 579                     unresolved_klass, class_loader, protection_domain,
 580                     false, CHECK_(nullHandle));
 581       interf = KlassHandle(THREAD, k);
 582 
 583       if (LinkWellKnownClasses)  // my super type is well known to me
 584         cp->klass_at_put(interface_index, interf()); // eagerly resolve
 585     }
 586 
 587     if (!Klass::cast(interf())->is_interface()) {
 588       THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
 589     }
 590     interfaces->obj_at_put(index, interf());
 591   }
 592 
 593   if (!_need_verify || length <= 1) {
 594     return interfaces;
 595   }
 596 
 597   // Check if there's any duplicates in interfaces
 598   ResourceMark rm(THREAD);
 599   NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
 600     THREAD, NameSigHash*, HASH_ROW_SIZE);
 601   initialize_hashtable(interface_names);
 602   bool dup = false;
 603   {
 604     debug_only(No_Safepoint_Verifier nsv;)
 605     for (index = 0; index < length; index++) {
 606       klassOop k = (klassOop)interfaces->obj_at(index);
 607       symbolOop name = instanceKlass::cast(k)->name();
 608       // If no duplicates, add (name, NULL) in hashtable interface_names.
 609       if (!put_after_lookup(name, NULL, interface_names)) {
 610         dup = true;
 611         break;
 612       }
 613     }
 614   }
 615   if (dup) {
 616     classfile_parse_error("Duplicate interface name in class file %s",
 617                           CHECK_(nullHandle));
 618   }
 619 
 620   return interfaces;
 621 }
 622 
 623 
 624 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
 625   // Make sure the constant pool entry is of a type appropriate to this field
 626   guarantee_property(
 627     (constantvalue_index > 0 &&
 628       constantvalue_index < cp->length()),
 629     "Bad initial value index %u in ConstantValue attribute in class file %s",
 630     constantvalue_index, CHECK);
 631   constantTag value_type = cp->tag_at(constantvalue_index);
 632   switch ( cp->basic_type_for_signature_at(signature_index) ) {
 633     case T_LONG:
 634       guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
 635       break;
 636     case T_FLOAT:
 637       guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
 638       break;
 639     case T_DOUBLE:
 640       guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
 641       break;
 642     case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
 643       guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
 644       break;
 645     case T_OBJECT:
 646       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18)
 647                          && (value_type.is_string() || value_type.is_unresolved_string())),
 648                          "Bad string initial value in class file %s", CHECK);
 649       break;
 650     default:
 651       classfile_parse_error(
 652         "Unable to set initial value %u in class file %s",
 653         constantvalue_index, CHECK);
 654   }
 655 }
 656 
 657 
 658 // Parse attributes for a field.
 659 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
 660                                              u2 attributes_count,
 661                                              bool is_static, u2 signature_index,
 662                                              u2* constantvalue_index_addr,
 663                                              bool* is_synthetic_addr,
 664                                              u2* generic_signature_index_addr,
 665                                              typeArrayHandle* field_annotations,
 666                                              TRAPS) {
 667   ClassFileStream* cfs = stream();
 668   assert(attributes_count > 0, "length should be greater than 0");
 669   u2 constantvalue_index = 0;
 670   u2 generic_signature_index = 0;
 671   bool is_synthetic = false;
 672   u1* runtime_visible_annotations = NULL;
 673   int runtime_visible_annotations_length = 0;
 674   u1* runtime_invisible_annotations = NULL;
 675   int runtime_invisible_annotations_length = 0;
 676   while (attributes_count--) {
 677     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
 678     u2 attribute_name_index = cfs->get_u2_fast();
 679     u4 attribute_length = cfs->get_u4_fast();
 680     check_property(valid_cp_range(attribute_name_index, cp->length()) &&
 681                    cp->tag_at(attribute_name_index).is_utf8(),
 682                    "Invalid field attribute index %u in class file %s",
 683                    attribute_name_index,
 684                    CHECK);
 685     symbolOop attribute_name = cp->symbol_at(attribute_name_index);
 686     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
 687       // ignore if non-static
 688       if (constantvalue_index != 0) {
 689         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
 690       }
 691       check_property(
 692         attribute_length == 2,
 693         "Invalid ConstantValue field attribute length %u in class file %s",
 694         attribute_length, CHECK);
 695       constantvalue_index = cfs->get_u2(CHECK);
 696       if (_need_verify) {
 697         verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
 698       }
 699     } else if (attribute_name == vmSymbols::tag_synthetic()) {
 700       if (attribute_length != 0) {
 701         classfile_parse_error(
 702           "Invalid Synthetic field attribute length %u in class file %s",
 703           attribute_length, CHECK);
 704       }
 705       is_synthetic = true;
 706     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
 707       if (attribute_length != 0) {
 708         classfile_parse_error(
 709           "Invalid Deprecated field attribute length %u in class file %s",
 710           attribute_length, CHECK);
 711       }
 712     } else if (_major_version >= JAVA_1_5_VERSION) {
 713       if (attribute_name == vmSymbols::tag_signature()) {
 714         if (attribute_length != 2) {
 715           classfile_parse_error(
 716             "Wrong size %u for field's Signature attribute in class file %s",
 717             attribute_length, CHECK);
 718         }
 719         generic_signature_index = cfs->get_u2(CHECK);
 720       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
 721         runtime_visible_annotations_length = attribute_length;
 722         runtime_visible_annotations = cfs->get_u1_buffer();
 723         assert(runtime_visible_annotations != NULL, "null visible annotations");
 724         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
 725       } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
 726         runtime_invisible_annotations_length = attribute_length;
 727         runtime_invisible_annotations = cfs->get_u1_buffer();
 728         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
 729         cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
 730       } else {
 731         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 732       }
 733     } else {
 734       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 735     }
 736   }
 737 
 738   *constantvalue_index_addr = constantvalue_index;
 739   *is_synthetic_addr = is_synthetic;
 740   *generic_signature_index_addr = generic_signature_index;
 741   *field_annotations = assemble_annotations(runtime_visible_annotations,
 742                                             runtime_visible_annotations_length,
 743                                             runtime_invisible_annotations,
 744                                             runtime_invisible_annotations_length,
 745                                             CHECK);
 746   return;
 747 }
 748 
 749 
 750 // Field allocation types. Used for computing field offsets.
 751 
 752 enum FieldAllocationType {
 753   STATIC_OOP,           // Oops
 754   STATIC_BYTE,          // Boolean, Byte, char
 755   STATIC_SHORT,         // shorts
 756   STATIC_WORD,          // ints
 757   STATIC_DOUBLE,        // long or double
 758   STATIC_ALIGNED_DOUBLE,// aligned long or double
 759   NONSTATIC_OOP,
 760   NONSTATIC_BYTE,
 761   NONSTATIC_SHORT,
 762   NONSTATIC_WORD,
 763   NONSTATIC_DOUBLE,
 764   NONSTATIC_ALIGNED_DOUBLE
 765 };
 766 
 767 
 768 struct FieldAllocationCount {
 769   unsigned int static_oop_count;
 770   unsigned int static_byte_count;
 771   unsigned int static_short_count;
 772   unsigned int static_word_count;
 773   unsigned int static_double_count;
 774   unsigned int nonstatic_oop_count;
 775   unsigned int nonstatic_byte_count;
 776   unsigned int nonstatic_short_count;
 777   unsigned int nonstatic_word_count;
 778   unsigned int nonstatic_double_count;
 779 };
 780 
 781 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
 782                                               struct FieldAllocationCount *fac,
 783                                               objArrayHandle* fields_annotations, TRAPS) {
 784   ClassFileStream* cfs = stream();
 785   typeArrayHandle nullHandle;
 786   cfs->guarantee_more(2, CHECK_(nullHandle));  // length
 787   u2 length = cfs->get_u2_fast();
 788   // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
 789   typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
 790   typeArrayHandle fields(THREAD, new_fields);
 791 
 792   int index = 0;
 793   typeArrayHandle field_annotations;
 794   for (int n = 0; n < length; n++) {
 795     cfs->guarantee_more(8, CHECK_(nullHandle));  // access_flags, name_index, descriptor_index, attributes_count
 796 
 797     AccessFlags access_flags;
 798     jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
 799     verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
 800     access_flags.set_flags(flags);
 801 
 802     u2 name_index = cfs->get_u2_fast();
 803     int cp_size = cp->length();
 804     check_property(
 805       valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
 806       "Invalid constant pool index %u for field name in class file %s",
 807       name_index, CHECK_(nullHandle));
 808     symbolHandle name(THREAD, cp->symbol_at(name_index));
 809     verify_legal_field_name(name, CHECK_(nullHandle));
 810 
 811     u2 signature_index = cfs->get_u2_fast();
 812     check_property(
 813       valid_cp_range(signature_index, cp_size) &&
 814         cp->tag_at(signature_index).is_utf8(),
 815       "Invalid constant pool index %u for field signature in class file %s",
 816       signature_index, CHECK_(nullHandle));
 817     symbolHandle sig(THREAD, cp->symbol_at(signature_index));
 818     verify_legal_field_signature(name, sig, CHECK_(nullHandle));
 819 
 820     u2 constantvalue_index = 0;
 821     bool is_synthetic = false;
 822     u2 generic_signature_index = 0;
 823     bool is_static = access_flags.is_static();
 824 
 825     u2 attributes_count = cfs->get_u2_fast();
 826     if (attributes_count > 0) {
 827       parse_field_attributes(cp, attributes_count, is_static, signature_index,
 828                              &constantvalue_index, &is_synthetic,
 829                              &generic_signature_index, &field_annotations,
 830                              CHECK_(nullHandle));
 831       if (field_annotations.not_null()) {
 832         if (fields_annotations->is_null()) {
 833           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
 834           *fields_annotations = objArrayHandle(THREAD, md);
 835         }
 836         (*fields_annotations)->obj_at_put(n, field_annotations());
 837       }
 838       if (is_synthetic) {
 839         access_flags.set_is_synthetic();
 840       }
 841     }
 842 
 843     fields->short_at_put(index++, access_flags.as_short());
 844     fields->short_at_put(index++, name_index);
 845     fields->short_at_put(index++, signature_index);
 846     fields->short_at_put(index++, constantvalue_index);
 847 
 848     // Remember how many oops we encountered and compute allocation type
 849     BasicType type = cp->basic_type_for_signature_at(signature_index);
 850     FieldAllocationType atype;
 851     if ( is_static ) {
 852       switch ( type ) {
 853         case  T_BOOLEAN:
 854         case  T_BYTE:
 855           fac->static_byte_count++;
 856           atype = STATIC_BYTE;
 857           break;
 858         case  T_LONG:
 859         case  T_DOUBLE:
 860           if (Universe::field_type_should_be_aligned(type)) {
 861             atype = STATIC_ALIGNED_DOUBLE;
 862           } else {
 863             atype = STATIC_DOUBLE;
 864           }
 865           fac->static_double_count++;
 866           break;
 867         case  T_CHAR:
 868         case  T_SHORT:
 869           fac->static_short_count++;
 870           atype = STATIC_SHORT;
 871           break;
 872         case  T_FLOAT:
 873         case  T_INT:
 874           fac->static_word_count++;
 875           atype = STATIC_WORD;
 876           break;
 877         case  T_ARRAY:
 878         case  T_OBJECT:
 879           fac->static_oop_count++;
 880           atype = STATIC_OOP;
 881           break;
 882         case  T_ADDRESS:
 883         case  T_VOID:
 884         default:
 885           assert(0, "bad field type");
 886       }
 887     } else {
 888       switch ( type ) {
 889         case  T_BOOLEAN:
 890         case  T_BYTE:
 891           fac->nonstatic_byte_count++;
 892           atype = NONSTATIC_BYTE;
 893           break;
 894         case  T_LONG:
 895         case  T_DOUBLE:
 896           if (Universe::field_type_should_be_aligned(type)) {
 897             atype = NONSTATIC_ALIGNED_DOUBLE;
 898           } else {
 899             atype = NONSTATIC_DOUBLE;
 900           }
 901           fac->nonstatic_double_count++;
 902           break;
 903         case  T_CHAR:
 904         case  T_SHORT:
 905           fac->nonstatic_short_count++;
 906           atype = NONSTATIC_SHORT;
 907           break;
 908         case  T_FLOAT:
 909         case  T_INT:
 910           fac->nonstatic_word_count++;
 911           atype = NONSTATIC_WORD;
 912           break;
 913         case  T_ARRAY:
 914         case  T_OBJECT:
 915           fac->nonstatic_oop_count++;
 916           atype = NONSTATIC_OOP;
 917           break;
 918         case  T_ADDRESS:
 919         case  T_VOID:
 920         default:
 921           assert(0, "bad field type");
 922       }
 923     }
 924 
 925     // The correct offset is computed later (all oop fields will be located together)
 926     // We temporarily store the allocation type in the offset field
 927     fields->short_at_put(index++, atype);
 928     fields->short_at_put(index++, 0);  // Clear out high word of byte offset
 929     fields->short_at_put(index++, generic_signature_index);
 930   }
 931 
 932   if (_need_verify && length > 1) {
 933     // Check duplicated fields
 934     ResourceMark rm(THREAD);
 935     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
 936       THREAD, NameSigHash*, HASH_ROW_SIZE);
 937     initialize_hashtable(names_and_sigs);
 938     bool dup = false;
 939     {
 940       debug_only(No_Safepoint_Verifier nsv;)
 941       for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
 942         int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
 943         symbolOop name = cp->symbol_at(name_index);
 944         int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
 945         symbolOop sig = cp->symbol_at(sig_index);
 946         // If no duplicates, add name/signature in hashtable names_and_sigs.
 947         if (!put_after_lookup(name, sig, names_and_sigs)) {
 948           dup = true;
 949           break;
 950         }
 951       }
 952     }
 953     if (dup) {
 954       classfile_parse_error("Duplicate field name&signature in class file %s",
 955                             CHECK_(nullHandle));
 956     }
 957   }
 958 
 959   return fields;
 960 }
 961 
 962 
 963 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
 964   while (length-- > 0) {
 965     *dest++ = Bytes::get_Java_u2((u1*) (src++));
 966   }
 967 }
 968 
 969 
 970 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
 971                                                        u4 exception_table_length,
 972                                                        constantPoolHandle cp,
 973                                                        TRAPS) {
 974   ClassFileStream* cfs = stream();
 975   typeArrayHandle nullHandle;
 976 
 977   // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
 978   typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
 979   typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
 980 
 981   int index = 0;
 982   cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
 983   for (unsigned int i = 0; i < exception_table_length; i++) {
 984     u2 start_pc = cfs->get_u2_fast();
 985     u2 end_pc = cfs->get_u2_fast();
 986     u2 handler_pc = cfs->get_u2_fast();
 987     u2 catch_type_index = cfs->get_u2_fast();
 988     // Will check legal target after parsing code array in verifier.
 989     if (_need_verify) {
 990       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
 991                          "Illegal exception table range in class file %s", CHECK_(nullHandle));
 992       guarantee_property(handler_pc < code_length,
 993                          "Illegal exception table handler in class file %s", CHECK_(nullHandle));
 994       if (catch_type_index != 0) {
 995         guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
 996                            is_klass_reference(cp, catch_type_index),
 997                            "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
 998       }
 999     }
1000     exception_handlers->int_at_put(index++, start_pc);
1001     exception_handlers->int_at_put(index++, end_pc);
1002     exception_handlers->int_at_put(index++, handler_pc);
1003     exception_handlers->int_at_put(index++, catch_type_index);
1004   }
1005   return exception_handlers;
1006 }
1007 
1008 void ClassFileParser::parse_linenumber_table(
1009     u4 code_attribute_length, u4 code_length,
1010     CompressedLineNumberWriteStream** write_stream, TRAPS) {
1011   ClassFileStream* cfs = stream();
1012   unsigned int num_entries = cfs->get_u2(CHECK);
1013 
1014   // Each entry is a u2 start_pc, and a u2 line_number
1015   unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1016 
1017   // Verify line number attribute and table length
1018   check_property(
1019     code_attribute_length == sizeof(u2) + length_in_bytes,
1020     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1021 
1022   cfs->guarantee_more(length_in_bytes, CHECK);
1023 
1024   if ((*write_stream) == NULL) {
1025     if (length_in_bytes > fixed_buffer_size) {
1026       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1027     } else {
1028       (*write_stream) = new CompressedLineNumberWriteStream(
1029         linenumbertable_buffer, fixed_buffer_size);
1030     }
1031   }
1032 
1033   while (num_entries-- > 0) {
1034     u2 bci  = cfs->get_u2_fast(); // start_pc
1035     u2 line = cfs->get_u2_fast(); // line_number
1036     guarantee_property(bci < code_length,
1037         "Invalid pc in LineNumberTable in class file %s", CHECK);
1038     (*write_stream)->write_pair(bci, line);
1039   }
1040 }
1041 
1042 
1043 // Class file LocalVariableTable elements.
1044 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1045  public:
1046   u2 start_bci;
1047   u2 length;
1048   u2 name_cp_index;
1049   u2 descriptor_cp_index;
1050   u2 slot;
1051 };
1052 
1053 
1054 class LVT_Hash: public CHeapObj {
1055  public:
1056   LocalVariableTableElement  *_elem;  // element
1057   LVT_Hash*                   _next;  // Next entry in hash table
1058 };
1059 
1060 unsigned int hash(LocalVariableTableElement *elem) {
1061   unsigned int raw_hash = elem->start_bci;
1062 
1063   raw_hash = elem->length        + raw_hash * 37;
1064   raw_hash = elem->name_cp_index + raw_hash * 37;
1065   raw_hash = elem->slot          + raw_hash * 37;
1066 
1067   return raw_hash % HASH_ROW_SIZE;
1068 }
1069 
1070 void initialize_hashtable(LVT_Hash** table) {
1071   for (int i = 0; i < HASH_ROW_SIZE; i++) {
1072     table[i] = NULL;
1073   }
1074 }
1075 
1076 void clear_hashtable(LVT_Hash** table) {
1077   for (int i = 0; i < HASH_ROW_SIZE; i++) {
1078     LVT_Hash* current = table[i];
1079     LVT_Hash* next;
1080     while (current != NULL) {
1081       next = current->_next;
1082       current->_next = NULL;
1083       delete(current);
1084       current = next;
1085     }
1086     table[i] = NULL;
1087   }
1088 }
1089 
1090 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1091   LVT_Hash* entry = table[index];
1092 
1093   /*
1094    * 3-tuple start_bci/length/slot has to be unique key,
1095    * so the following comparison seems to be redundant:
1096    *       && elem->name_cp_index == entry->_elem->name_cp_index
1097    */
1098   while (entry != NULL) {
1099     if (elem->start_bci           == entry->_elem->start_bci
1100      && elem->length              == entry->_elem->length
1101      && elem->name_cp_index       == entry->_elem->name_cp_index
1102      && elem->slot                == entry->_elem->slot
1103     ) {
1104       return entry;
1105     }
1106     entry = entry->_next;
1107   }
1108   return NULL;
1109 }
1110 
1111 // Return false if the local variable is found in table.
1112 // Return true if no duplicate is found.
1113 // And local variable is added as a new entry in table.
1114 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1115   // First lookup for duplicates
1116   int index = hash(elem);
1117   LVT_Hash* entry = LVT_lookup(elem, index, table);
1118 
1119   if (entry != NULL) {
1120       return false;
1121   }
1122   // No duplicate is found, allocate a new entry and fill it.
1123   if ((entry = new LVT_Hash()) == NULL) {
1124     return false;
1125   }
1126   entry->_elem = elem;
1127 
1128   // Insert into hash table
1129   entry->_next = table[index];
1130   table[index] = entry;
1131 
1132   return true;
1133 }
1134 
1135 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1136   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1137   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1138   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1139   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1140   lvt->signature_cp_index  = 0;
1141   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1142 }
1143 
1144 // Function is used to parse both attributes:
1145 //       LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1146 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1147                                                u2 max_locals,
1148                                                u4 code_attribute_length,
1149                                                constantPoolHandle cp,
1150                                                u2* localvariable_table_length,
1151                                                bool isLVTT,
1152                                                TRAPS) {
1153   ClassFileStream* cfs = stream();
1154   const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1155   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1156   unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1157   // Verify local variable table attribute has right length
1158   if (_need_verify) {
1159     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1160                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1161   }
1162   u2* localvariable_table_start = cfs->get_u2_buffer();
1163   assert(localvariable_table_start != NULL, "null local variable table");
1164   if (!_need_verify) {
1165     cfs->skip_u2_fast(size);
1166   } else {
1167     cfs->guarantee_more(size * 2, CHECK_NULL);
1168     for(int i = 0; i < (*localvariable_table_length); i++) {
1169       u2 start_pc = cfs->get_u2_fast();
1170       u2 length = cfs->get_u2_fast();
1171       u2 name_index = cfs->get_u2_fast();
1172       u2 descriptor_index = cfs->get_u2_fast();
1173       u2 index = cfs->get_u2_fast();
1174       // Assign to a u4 to avoid overflow
1175       u4 end_pc = (u4)start_pc + (u4)length;
1176 
1177       if (start_pc >= code_length) {
1178         classfile_parse_error(
1179           "Invalid start_pc %u in %s in class file %s",
1180           start_pc, tbl_name, CHECK_NULL);
1181       }
1182       if (end_pc > code_length) {
1183         classfile_parse_error(
1184           "Invalid length %u in %s in class file %s",
1185           length, tbl_name, CHECK_NULL);
1186       }
1187       int cp_size = cp->length();
1188       guarantee_property(
1189         valid_cp_range(name_index, cp_size) &&
1190           cp->tag_at(name_index).is_utf8(),
1191         "Name index %u in %s has bad constant type in class file %s",
1192         name_index, tbl_name, CHECK_NULL);
1193       guarantee_property(
1194         valid_cp_range(descriptor_index, cp_size) &&
1195           cp->tag_at(descriptor_index).is_utf8(),
1196         "Signature index %u in %s has bad constant type in class file %s",
1197         descriptor_index, tbl_name, CHECK_NULL);
1198 
1199       symbolHandle name(THREAD, cp->symbol_at(name_index));
1200       symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1201       verify_legal_field_name(name, CHECK_NULL);
1202       u2 extra_slot = 0;
1203       if (!isLVTT) {
1204         verify_legal_field_signature(name, sig, CHECK_NULL);
1205 
1206         // 4894874: check special cases for double and long local variables
1207         if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1208             sig() == vmSymbols::type_signature(T_LONG)) {
1209           extra_slot = 1;
1210         }
1211       }
1212       guarantee_property((index + extra_slot) < max_locals,
1213                           "Invalid index %u in %s in class file %s",
1214                           index, tbl_name, CHECK_NULL);
1215     }
1216   }
1217   return localvariable_table_start;
1218 }
1219 
1220 
1221 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1222                                       u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1223   ClassFileStream* cfs = stream();
1224   u2 index = 0; // index in the array with long/double occupying two slots
1225   u4 i1 = *u1_index;
1226   u4 i2 = *u2_index + 1;
1227   for(int i = 0; i < array_length; i++) {
1228     u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1229     index++;
1230     if (tag == ITEM_Long || tag == ITEM_Double) {
1231       index++;
1232     } else if (tag == ITEM_Object) {
1233       u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1234       guarantee_property(valid_cp_range(class_index, cp->length()) &&
1235                          is_klass_reference(cp, class_index),
1236                          "Bad class index %u in StackMap in class file %s",
1237                          class_index, CHECK);
1238     } else if (tag == ITEM_Uninitialized) {
1239       u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1240       guarantee_property(
1241         offset < code_length,
1242         "Bad uninitialized type offset %u in StackMap in class file %s",
1243         offset, CHECK);
1244     } else {
1245       guarantee_property(
1246         tag <= (u1)ITEM_Uninitialized,
1247         "Unknown variable type %u in StackMap in class file %s",
1248         tag, CHECK);
1249     }
1250   }
1251   u2_array[*u2_index] = index;
1252   *u1_index = i1;
1253   *u2_index = i2;
1254 }
1255 
1256 typeArrayOop ClassFileParser::parse_stackmap_table(
1257     u4 code_attribute_length, TRAPS) {
1258   if (code_attribute_length == 0)
1259     return NULL;
1260 
1261   ClassFileStream* cfs = stream();
1262   u1* stackmap_table_start = cfs->get_u1_buffer();
1263   assert(stackmap_table_start != NULL, "null stackmap table");
1264 
1265   // check code_attribute_length first
1266   stream()->skip_u1(code_attribute_length, CHECK_NULL);
1267 
1268   if (!_need_verify && !DumpSharedSpaces) {
1269     return NULL;
1270   }
1271 
1272   typeArrayOop stackmap_data =
1273     oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1274 
1275   stackmap_data->set_length(code_attribute_length);
1276   memcpy((void*)stackmap_data->byte_at_addr(0),
1277          (void*)stackmap_table_start, code_attribute_length);
1278   return stackmap_data;
1279 }
1280 
1281 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1282                                               u4 method_attribute_length,
1283                                               constantPoolHandle cp, TRAPS) {
1284   ClassFileStream* cfs = stream();
1285   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1286   *checked_exceptions_length = cfs->get_u2_fast();
1287   unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1288   u2* checked_exceptions_start = cfs->get_u2_buffer();
1289   assert(checked_exceptions_start != NULL, "null checked exceptions");
1290   if (!_need_verify) {
1291     cfs->skip_u2_fast(size);
1292   } else {
1293     // Verify each value in the checked exception table
1294     u2 checked_exception;
1295     u2 len = *checked_exceptions_length;
1296     cfs->guarantee_more(2 * len, CHECK_NULL);
1297     for (int i = 0; i < len; i++) {
1298       checked_exception = cfs->get_u2_fast();
1299       check_property(
1300         valid_cp_range(checked_exception, cp->length()) &&
1301         is_klass_reference(cp, checked_exception),
1302         "Exception name has bad type at constant pool %u in class file %s",
1303         checked_exception, CHECK_NULL);
1304     }
1305   }
1306   // check exceptions attribute length
1307   if (_need_verify) {
1308     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1309                                                    sizeof(u2) * size),
1310                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1311   }
1312   return checked_exceptions_start;
1313 }
1314 
1315 
1316 #define MAX_ARGS_SIZE 255
1317 #define MAX_CODE_SIZE 65535
1318 #define INITIAL_MAX_LVT_NUMBER 256
1319 
1320 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1321 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1322 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1323 // entire method attribute is parsed.
1324 //
1325 // The promoted_flags parameter is used to pass relevant access_flags
1326 // from the method back up to the containing klass. These flag values
1327 // are added to klass's access_flags.
1328 
1329 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1330                                            AccessFlags *promoted_flags,
1331                                            typeArrayHandle* method_annotations,
1332                                            typeArrayHandle* method_parameter_annotations,
1333                                            typeArrayHandle* method_default_annotations,
1334                                            TRAPS) {
1335   ClassFileStream* cfs = stream();
1336   methodHandle nullHandle;
1337   ResourceMark rm(THREAD);
1338   // Parse fixed parts
1339   cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1340 
1341   int flags = cfs->get_u2_fast();
1342   u2 name_index = cfs->get_u2_fast();
1343   int cp_size = cp->length();
1344   check_property(
1345     valid_cp_range(name_index, cp_size) &&
1346       cp->tag_at(name_index).is_utf8(),
1347     "Illegal constant pool index %u for method name in class file %s",
1348     name_index, CHECK_(nullHandle));
1349   symbolHandle name(THREAD, cp->symbol_at(name_index));
1350   verify_legal_method_name(name, CHECK_(nullHandle));
1351 
1352   u2 signature_index = cfs->get_u2_fast();
1353   guarantee_property(
1354     valid_cp_range(signature_index, cp_size) &&
1355       cp->tag_at(signature_index).is_utf8(),
1356     "Illegal constant pool index %u for method signature in class file %s",
1357     signature_index, CHECK_(nullHandle));
1358   symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1359 
1360   AccessFlags access_flags;
1361   if (name == vmSymbols::class_initializer_name()) {
1362     // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1363     flags = JVM_ACC_STATIC;
1364   } else {
1365     verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1366   }
1367 
1368   int args_size = -1;  // only used when _need_verify is true
1369   if (_need_verify) {
1370     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1371                  verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1372     if (args_size > MAX_ARGS_SIZE) {
1373       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1374     }
1375   }
1376 
1377   access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1378 
1379   // Default values for code and exceptions attribute elements
1380   u2 max_stack = 0;
1381   u2 max_locals = 0;
1382   u4 code_length = 0;
1383   u1* code_start = 0;
1384   u2 exception_table_length = 0;
1385   typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1386   u2 checked_exceptions_length = 0;
1387   u2* checked_exceptions_start = NULL;
1388   CompressedLineNumberWriteStream* linenumber_table = NULL;
1389   int linenumber_table_length = 0;
1390   int total_lvt_length = 0;
1391   u2 lvt_cnt = 0;
1392   u2 lvtt_cnt = 0;
1393   bool lvt_allocated = false;
1394   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1395   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1396   u2* localvariable_table_length;
1397   u2** localvariable_table_start;
1398   u2* localvariable_type_table_length;
1399   u2** localvariable_type_table_start;
1400   bool parsed_code_attribute = false;
1401   bool parsed_checked_exceptions_attribute = false;
1402   bool parsed_stackmap_attribute = false;
1403   // stackmap attribute - JDK1.5
1404   typeArrayHandle stackmap_data;
1405   u2 generic_signature_index = 0;
1406   u1* runtime_visible_annotations = NULL;
1407   int runtime_visible_annotations_length = 0;
1408   u1* runtime_invisible_annotations = NULL;
1409   int runtime_invisible_annotations_length = 0;
1410   u1* runtime_visible_parameter_annotations = NULL;
1411   int runtime_visible_parameter_annotations_length = 0;
1412   u1* runtime_invisible_parameter_annotations = NULL;
1413   int runtime_invisible_parameter_annotations_length = 0;
1414   u1* annotation_default = NULL;
1415   int annotation_default_length = 0;
1416 
1417   // Parse code and exceptions attribute
1418   u2 method_attributes_count = cfs->get_u2_fast();
1419   while (method_attributes_count--) {
1420     cfs->guarantee_more(6, CHECK_(nullHandle));  // method_attribute_name_index, method_attribute_length
1421     u2 method_attribute_name_index = cfs->get_u2_fast();
1422     u4 method_attribute_length = cfs->get_u4_fast();
1423     check_property(
1424       valid_cp_range(method_attribute_name_index, cp_size) &&
1425         cp->tag_at(method_attribute_name_index).is_utf8(),
1426       "Invalid method attribute name index %u in class file %s",
1427       method_attribute_name_index, CHECK_(nullHandle));
1428 
1429     symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1430     if (method_attribute_name == vmSymbols::tag_code()) {
1431       // Parse Code attribute
1432       if (_need_verify) {
1433         guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1434                         "Code attribute in native or abstract methods in class file %s",
1435                          CHECK_(nullHandle));
1436       }
1437       if (parsed_code_attribute) {
1438         classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1439       }
1440       parsed_code_attribute = true;
1441 
1442       // Stack size, locals size, and code size
1443       if (_major_version == 45 && _minor_version <= 2) {
1444         cfs->guarantee_more(4, CHECK_(nullHandle));
1445         max_stack = cfs->get_u1_fast();
1446         max_locals = cfs->get_u1_fast();
1447         code_length = cfs->get_u2_fast();
1448       } else {
1449         cfs->guarantee_more(8, CHECK_(nullHandle));
1450         max_stack = cfs->get_u2_fast();
1451         max_locals = cfs->get_u2_fast();
1452         code_length = cfs->get_u4_fast();
1453       }
1454       if (_need_verify) {
1455         guarantee_property(args_size <= max_locals,
1456                            "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1457         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1458                            "Invalid method Code length %u in class file %s",
1459                            code_length, CHECK_(nullHandle));
1460       }
1461       // Code pointer
1462       code_start = cfs->get_u1_buffer();
1463       assert(code_start != NULL, "null code start");
1464       cfs->guarantee_more(code_length, CHECK_(nullHandle));
1465       cfs->skip_u1_fast(code_length);
1466 
1467       // Exception handler table
1468       cfs->guarantee_more(2, CHECK_(nullHandle));  // exception_table_length
1469       exception_table_length = cfs->get_u2_fast();
1470       if (exception_table_length > 0) {
1471         exception_handlers =
1472               parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1473       }
1474 
1475       // Parse additional attributes in code attribute
1476       cfs->guarantee_more(2, CHECK_(nullHandle));  // code_attributes_count
1477       u2 code_attributes_count = cfs->get_u2_fast();
1478 
1479       unsigned int calculated_attribute_length = 0;
1480 
1481       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1482         calculated_attribute_length =
1483             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1484       } else {
1485         // max_stack, locals and length are smaller in pre-version 45.2 classes
1486         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1487       }
1488       calculated_attribute_length +=
1489         code_length +
1490         sizeof(exception_table_length) +
1491         sizeof(code_attributes_count) +
1492         exception_table_length *
1493             ( sizeof(u2) +   // start_pc
1494               sizeof(u2) +   // end_pc
1495               sizeof(u2) +   // handler_pc
1496               sizeof(u2) );  // catch_type_index
1497 
1498       while (code_attributes_count--) {
1499         cfs->guarantee_more(6, CHECK_(nullHandle));  // code_attribute_name_index, code_attribute_length
1500         u2 code_attribute_name_index = cfs->get_u2_fast();
1501         u4 code_attribute_length = cfs->get_u4_fast();
1502         calculated_attribute_length += code_attribute_length +
1503                                        sizeof(code_attribute_name_index) +
1504                                        sizeof(code_attribute_length);
1505         check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1506                        cp->tag_at(code_attribute_name_index).is_utf8(),
1507                        "Invalid code attribute name index %u in class file %s",
1508                        code_attribute_name_index,
1509                        CHECK_(nullHandle));
1510         if (LoadLineNumberTables &&
1511             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1512           // Parse and compress line number table
1513           parse_linenumber_table(code_attribute_length, code_length,
1514             &linenumber_table, CHECK_(nullHandle));
1515 
1516         } else if (LoadLocalVariableTables &&
1517                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1518           // Parse local variable table
1519           if (!lvt_allocated) {
1520             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1521               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1522             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1523               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1524             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1525               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1526             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1527               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1528             lvt_allocated = true;
1529           }
1530           if (lvt_cnt == max_lvt_cnt) {
1531             max_lvt_cnt <<= 1;
1532             REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1533             REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1534           }
1535           localvariable_table_start[lvt_cnt] =
1536             parse_localvariable_table(code_length,
1537                                       max_locals,
1538                                       code_attribute_length,
1539                                       cp,
1540                                       &localvariable_table_length[lvt_cnt],
1541                                       false,    // is not LVTT
1542                                       CHECK_(nullHandle));
1543           total_lvt_length += localvariable_table_length[lvt_cnt];
1544           lvt_cnt++;
1545         } else if (LoadLocalVariableTypeTables &&
1546                    _major_version >= JAVA_1_5_VERSION &&
1547                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1548           if (!lvt_allocated) {
1549             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1550               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1551             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1552               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1553             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1554               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1555             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1556               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1557             lvt_allocated = true;
1558           }
1559           // Parse local variable type table
1560           if (lvtt_cnt == max_lvtt_cnt) {
1561             max_lvtt_cnt <<= 1;
1562             REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1563             REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1564           }
1565           localvariable_type_table_start[lvtt_cnt] =
1566             parse_localvariable_table(code_length,
1567                                       max_locals,
1568                                       code_attribute_length,
1569                                       cp,
1570                                       &localvariable_type_table_length[lvtt_cnt],
1571                                       true,     // is LVTT
1572                                       CHECK_(nullHandle));
1573           lvtt_cnt++;
1574         } else if (UseSplitVerifier &&
1575                    _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1576                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1577           // Stack map is only needed by the new verifier in JDK1.5.
1578           if (parsed_stackmap_attribute) {
1579             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1580           }
1581           typeArrayOop sm =
1582             parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1583           stackmap_data = typeArrayHandle(THREAD, sm);
1584           parsed_stackmap_attribute = true;
1585         } else {
1586           // Skip unknown attributes
1587           cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1588         }
1589       }
1590       // check method attribute length
1591       if (_need_verify) {
1592         guarantee_property(method_attribute_length == calculated_attribute_length,
1593                            "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1594       }
1595     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1596       // Parse Exceptions attribute
1597       if (parsed_checked_exceptions_attribute) {
1598         classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1599       }
1600       parsed_checked_exceptions_attribute = true;
1601       checked_exceptions_start =
1602             parse_checked_exceptions(&checked_exceptions_length,
1603                                      method_attribute_length,
1604                                      cp, CHECK_(nullHandle));
1605     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1606       if (method_attribute_length != 0) {
1607         classfile_parse_error(
1608           "Invalid Synthetic method attribute length %u in class file %s",
1609           method_attribute_length, CHECK_(nullHandle));
1610       }
1611       // Should we check that there hasn't already been a synthetic attribute?
1612       access_flags.set_is_synthetic();
1613     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1614       if (method_attribute_length != 0) {
1615         classfile_parse_error(
1616           "Invalid Deprecated method attribute length %u in class file %s",
1617           method_attribute_length, CHECK_(nullHandle));
1618       }
1619     } else if (_major_version >= JAVA_1_5_VERSION) {
1620       if (method_attribute_name == vmSymbols::tag_signature()) {
1621         if (method_attribute_length != 2) {
1622           classfile_parse_error(
1623             "Invalid Signature attribute length %u in class file %s",
1624             method_attribute_length, CHECK_(nullHandle));
1625         }
1626         cfs->guarantee_more(2, CHECK_(nullHandle));  // generic_signature_index
1627         generic_signature_index = cfs->get_u2_fast();
1628       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1629         runtime_visible_annotations_length = method_attribute_length;
1630         runtime_visible_annotations = cfs->get_u1_buffer();
1631         assert(runtime_visible_annotations != NULL, "null visible annotations");
1632         cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1633       } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1634         runtime_invisible_annotations_length = method_attribute_length;
1635         runtime_invisible_annotations = cfs->get_u1_buffer();
1636         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1637         cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1638       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1639         runtime_visible_parameter_annotations_length = method_attribute_length;
1640         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1641         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1642         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1643       } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1644         runtime_invisible_parameter_annotations_length = method_attribute_length;
1645         runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1646         assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1647         cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1648       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1649         annotation_default_length = method_attribute_length;
1650         annotation_default = cfs->get_u1_buffer();
1651         assert(annotation_default != NULL, "null annotation default");
1652         cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1653       } else {
1654         // Skip unknown attributes
1655         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1656       }
1657     } else {
1658       // Skip unknown attributes
1659       cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1660     }
1661   }
1662 
1663   if (linenumber_table != NULL) {
1664     linenumber_table->write_terminator();
1665     linenumber_table_length = linenumber_table->position();
1666   }
1667 
1668   // Make sure there's at least one Code attribute in non-native/non-abstract method
1669   if (_need_verify) {
1670     guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1671                       "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1672   }
1673 
1674   // All sizing information for a methodOop is finally available, now create it
1675   methodOop m_oop  = oopFactory::new_method(
1676     code_length, access_flags, linenumber_table_length,
1677     total_lvt_length, checked_exceptions_length,
1678     methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1679   methodHandle m (THREAD, m_oop);
1680 
1681   ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1682 
1683   // Fill in information from fixed part (access_flags already set)
1684   m->set_constants(cp());
1685   m->set_name_index(name_index);
1686   m->set_signature_index(signature_index);
1687   m->set_generic_signature_index(generic_signature_index);
1688 #ifdef CC_INTERP
1689   // hmm is there a gc issue here??
1690   ResultTypeFinder rtf(cp->symbol_at(signature_index));
1691   m->set_result_index(rtf.type());
1692 #endif
1693 
1694   if (args_size >= 0) {
1695     m->set_size_of_parameters(args_size);
1696   } else {
1697     m->compute_size_of_parameters(THREAD);
1698   }
1699 #ifdef ASSERT
1700   if (args_size >= 0) {
1701     m->compute_size_of_parameters(THREAD);
1702     assert(args_size == m->size_of_parameters(), "");
1703   }
1704 #endif
1705 
1706   // Fill in code attribute information
1707   m->set_max_stack(max_stack);
1708   m->set_max_locals(max_locals);
1709   m->constMethod()->set_stackmap_data(stackmap_data());
1710 
1711   /**
1712    * The exception_table field is the flag used to indicate
1713    * that the methodOop and it's associated constMethodOop are partially
1714    * initialized and thus are exempt from pre/post GC verification.  Once
1715    * the field is set, the oops are considered fully initialized so make
1716    * sure that the oops can pass verification when this field is set.
1717    */
1718   m->set_exception_table(exception_handlers());
1719 
1720   // Copy byte codes
1721   m->set_code(code_start);
1722 
1723   // Copy line number table
1724   if (linenumber_table != NULL) {
1725     memcpy(m->compressed_linenumber_table(),
1726            linenumber_table->buffer(), linenumber_table_length);
1727   }
1728 
1729   // Copy checked exceptions
1730   if (checked_exceptions_length > 0) {
1731     int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1732     copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1733   }
1734 
1735   /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1736    *
1737    * Rules for LVT's and LVTT's are:
1738    *   - There can be any number of LVT's and LVTT's.
1739    *   - If there are n LVT's, it is the same as if there was just
1740    *     one LVT containing all the entries from the n LVT's.
1741    *   - There may be no more than one LVT entry per local variable.
1742    *     Two LVT entries are 'equal' if these fields are the same:
1743    *        start_pc, length, name, slot
1744    *   - There may be no more than one LVTT entry per each LVT entry.
1745    *     Each LVTT entry has to match some LVT entry.
1746    *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1747    */
1748   if (total_lvt_length > 0) {
1749     int tbl_no, idx;
1750 
1751     promoted_flags->set_has_localvariable_table();
1752 
1753     LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1754     initialize_hashtable(lvt_Hash);
1755 
1756     // To fill LocalVariableTable in
1757     Classfile_LVT_Element*  cf_lvt;
1758     LocalVariableTableElement* lvt = m->localvariable_table_start();
1759 
1760     for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1761       cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1762       for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1763         copy_lvt_element(&cf_lvt[idx], lvt);
1764         // If no duplicates, add LVT elem in hashtable lvt_Hash.
1765         if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1766           && _need_verify
1767           && _major_version >= JAVA_1_5_VERSION ) {
1768           clear_hashtable(lvt_Hash);
1769           classfile_parse_error("Duplicated LocalVariableTable attribute "
1770                                 "entry for '%s' in class file %s",
1771                                  cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1772                                  CHECK_(nullHandle));
1773         }
1774       }
1775     }
1776 
1777     // To merge LocalVariableTable and LocalVariableTypeTable
1778     Classfile_LVT_Element* cf_lvtt;
1779     LocalVariableTableElement lvtt_elem;
1780 
1781     for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1782       cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1783       for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1784         copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1785         int index = hash(&lvtt_elem);
1786         LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1787         if (entry == NULL) {
1788           if (_need_verify) {
1789             clear_hashtable(lvt_Hash);
1790             classfile_parse_error("LVTT entry for '%s' in class file %s "
1791                                   "does not match any LVT entry",
1792                                    cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1793                                    CHECK_(nullHandle));
1794           }
1795         } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1796           clear_hashtable(lvt_Hash);
1797           classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1798                                 "entry for '%s' in class file %s",
1799                                  cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1800                                  CHECK_(nullHandle));
1801         } else {
1802           // to add generic signatures into LocalVariableTable
1803           entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1804         }
1805       }
1806     }
1807     clear_hashtable(lvt_Hash);
1808   }
1809 
1810   *method_annotations = assemble_annotations(runtime_visible_annotations,
1811                                              runtime_visible_annotations_length,
1812                                              runtime_invisible_annotations,
1813                                              runtime_invisible_annotations_length,
1814                                              CHECK_(nullHandle));
1815   *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
1816                                                        runtime_visible_parameter_annotations_length,
1817                                                        runtime_invisible_parameter_annotations,
1818                                                        runtime_invisible_parameter_annotations_length,
1819                                                        CHECK_(nullHandle));
1820   *method_default_annotations = assemble_annotations(annotation_default,
1821                                                      annotation_default_length,
1822                                                      NULL,
1823                                                      0,
1824                                                      CHECK_(nullHandle));
1825 
1826   if (name() == vmSymbols::finalize_method_name() &&
1827       signature() == vmSymbols::void_method_signature()) {
1828     if (m->is_empty_method()) {
1829       _has_empty_finalizer = true;
1830     } else {
1831       _has_finalizer = true;
1832     }
1833   }
1834   if (name() == vmSymbols::object_initializer_name() &&
1835       signature() == vmSymbols::void_method_signature() &&
1836       m->is_vanilla_constructor()) {
1837     _has_vanilla_constructor = true;
1838   }
1839 
1840   if (EnableMethodHandles && m->is_method_handle_invoke()) {
1841     THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
1842                "Method handle invokers must be defined internally to the VM", nullHandle);
1843   }
1844 
1845   return m;
1846 }
1847 
1848 
1849 // The promoted_flags parameter is used to pass relevant access_flags
1850 // from the methods back up to the containing klass. These flag values
1851 // are added to klass's access_flags.
1852 
1853 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
1854                                               AccessFlags* promoted_flags,
1855                                               bool* has_final_method,
1856                                               objArrayOop* methods_annotations_oop,
1857                                               objArrayOop* methods_parameter_annotations_oop,
1858                                               objArrayOop* methods_default_annotations_oop,
1859                                               TRAPS) {
1860   ClassFileStream* cfs = stream();
1861   objArrayHandle nullHandle;
1862   typeArrayHandle method_annotations;
1863   typeArrayHandle method_parameter_annotations;
1864   typeArrayHandle method_default_annotations;
1865   cfs->guarantee_more(2, CHECK_(nullHandle));  // length
1866   u2 length = cfs->get_u2_fast();
1867   if (length == 0) {
1868     return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
1869   } else {
1870     objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1871     objArrayHandle methods(THREAD, m);
1872     HandleMark hm(THREAD);
1873     objArrayHandle methods_annotations;
1874     objArrayHandle methods_parameter_annotations;
1875     objArrayHandle methods_default_annotations;
1876     for (int index = 0; index < length; index++) {
1877       methodHandle method = parse_method(cp, is_interface,
1878                                          promoted_flags,
1879                                          &method_annotations,
1880                                          &method_parameter_annotations,
1881                                          &method_default_annotations,
1882                                          CHECK_(nullHandle));
1883       if (method->is_final()) {
1884         *has_final_method = true;
1885       }
1886       methods->obj_at_put(index, method());
1887       if (method_annotations.not_null()) {
1888         if (methods_annotations.is_null()) {
1889           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1890           methods_annotations = objArrayHandle(THREAD, md);
1891         }
1892         methods_annotations->obj_at_put(index, method_annotations());
1893       }
1894       if (method_parameter_annotations.not_null()) {
1895         if (methods_parameter_annotations.is_null()) {
1896           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1897           methods_parameter_annotations = objArrayHandle(THREAD, md);
1898         }
1899         methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
1900       }
1901       if (method_default_annotations.not_null()) {
1902         if (methods_default_annotations.is_null()) {
1903           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1904           methods_default_annotations = objArrayHandle(THREAD, md);
1905         }
1906         methods_default_annotations->obj_at_put(index, method_default_annotations());
1907       }
1908     }
1909     if (_need_verify && length > 1) {
1910       // Check duplicated methods
1911       ResourceMark rm(THREAD);
1912       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1913         THREAD, NameSigHash*, HASH_ROW_SIZE);
1914       initialize_hashtable(names_and_sigs);
1915       bool dup = false;
1916       {
1917         debug_only(No_Safepoint_Verifier nsv;)
1918         for (int i = 0; i < length; i++) {
1919           methodOop m = (methodOop)methods->obj_at(i);
1920           // If no duplicates, add name/signature in hashtable names_and_sigs.
1921           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
1922             dup = true;
1923             break;
1924           }
1925         }
1926       }
1927       if (dup) {
1928         classfile_parse_error("Duplicate method name&signature in class file %s",
1929                               CHECK_(nullHandle));
1930       }
1931     }
1932 
1933     *methods_annotations_oop = methods_annotations();
1934     *methods_parameter_annotations_oop = methods_parameter_annotations();
1935     *methods_default_annotations_oop = methods_default_annotations();
1936 
1937     return methods;
1938   }
1939 }
1940 
1941 
1942 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
1943                                               objArrayHandle methods_annotations,
1944                                               objArrayHandle methods_parameter_annotations,
1945                                               objArrayHandle methods_default_annotations,
1946                                               TRAPS) {
1947   typeArrayHandle nullHandle;
1948   int length = methods()->length();
1949   // If JVMTI original method ordering is enabled we have to
1950   // remember the original class file ordering.
1951   // We temporarily use the vtable_index field in the methodOop to store the
1952   // class file index, so we can read in after calling qsort.
1953   if (JvmtiExport::can_maintain_original_method_order()) {
1954     for (int index = 0; index < length; index++) {
1955       methodOop m = methodOop(methods->obj_at(index));
1956       assert(!m->valid_vtable_index(), "vtable index should not be set");
1957       m->set_vtable_index(index);
1958     }
1959   }
1960   // Sort method array by ascending method name (for faster lookups & vtable construction)
1961   // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
1962   methodOopDesc::sort_methods(methods(),
1963                               methods_annotations(),
1964                               methods_parameter_annotations(),
1965                               methods_default_annotations());
1966 
1967   // If JVMTI original method ordering is enabled construct int array remembering the original ordering
1968   if (JvmtiExport::can_maintain_original_method_order()) {
1969     typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
1970     typeArrayHandle method_ordering(THREAD, new_ordering);
1971     for (int index = 0; index < length; index++) {
1972       methodOop m = methodOop(methods->obj_at(index));
1973       int old_index = m->vtable_index();
1974       assert(old_index >= 0 && old_index < length, "invalid method index");
1975       method_ordering->int_at_put(index, old_index);
1976       m->set_vtable_index(methodOopDesc::invalid_vtable_index);
1977     }
1978     return method_ordering;
1979   } else {
1980     return typeArrayHandle(THREAD, Universe::the_empty_int_array());
1981   }
1982 }
1983 
1984 
1985 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
1986   ClassFileStream* cfs = stream();
1987   cfs->guarantee_more(2, CHECK);  // sourcefile_index
1988   u2 sourcefile_index = cfs->get_u2_fast();
1989   check_property(
1990     valid_cp_range(sourcefile_index, cp->length()) &&
1991       cp->tag_at(sourcefile_index).is_utf8(),
1992     "Invalid SourceFile attribute at constant pool index %u in class file %s",
1993     sourcefile_index, CHECK);
1994   k->set_source_file_name(cp->symbol_at(sourcefile_index));
1995 }
1996 
1997 
1998 
1999 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2000                                                                        instanceKlassHandle k,
2001                                                                        int length, TRAPS) {
2002   ClassFileStream* cfs = stream();
2003   u1* sde_buffer = cfs->get_u1_buffer();
2004   assert(sde_buffer != NULL, "null sde buffer");
2005 
2006   // Don't bother storing it if there is no way to retrieve it
2007   if (JvmtiExport::can_get_source_debug_extension()) {
2008     // Optimistically assume that only 1 byte UTF format is used
2009     // (common case)
2010     symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2011                                                   length, CHECK);
2012     k->set_source_debug_extension(sde_symbol);
2013   }
2014   // Got utf8 string, set stream position forward
2015   cfs->skip_u1(length, CHECK);
2016 }
2017 
2018 
2019 // Inner classes can be static, private or protected (classic VM does this)
2020 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2021 
2022 // Return number of classes in the inner classes attribute table
2023 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2024   ClassFileStream* cfs = stream();
2025   cfs->guarantee_more(2, CHECK_0);  // length
2026   u2 length = cfs->get_u2_fast();
2027 
2028   // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2029   typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2030   typeArrayHandle inner_classes(THREAD, ic);
2031   int index = 0;
2032   int cp_size = cp->length();
2033   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
2034   for (int n = 0; n < length; n++) {
2035     // Inner class index
2036     u2 inner_class_info_index = cfs->get_u2_fast();
2037     check_property(
2038       inner_class_info_index == 0 ||
2039         (valid_cp_range(inner_class_info_index, cp_size) &&
2040         is_klass_reference(cp, inner_class_info_index)),
2041       "inner_class_info_index %u has bad constant type in class file %s",
2042       inner_class_info_index, CHECK_0);
2043     // Outer class index
2044     u2 outer_class_info_index = cfs->get_u2_fast();
2045     check_property(
2046       outer_class_info_index == 0 ||
2047         (valid_cp_range(outer_class_info_index, cp_size) &&
2048         is_klass_reference(cp, outer_class_info_index)),
2049       "outer_class_info_index %u has bad constant type in class file %s",
2050       outer_class_info_index, CHECK_0);
2051     // Inner class name
2052     u2 inner_name_index = cfs->get_u2_fast();
2053     check_property(
2054       inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2055         cp->tag_at(inner_name_index).is_utf8()),
2056       "inner_name_index %u has bad constant type in class file %s",
2057       inner_name_index, CHECK_0);
2058     if (_need_verify) {
2059       guarantee_property(inner_class_info_index != outer_class_info_index,
2060                          "Class is both outer and inner class in class file %s", CHECK_0);
2061     }
2062     // Access flags
2063     AccessFlags inner_access_flags;
2064     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2065     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2066       // Set abstract bit for old class files for backward compatibility
2067       flags |= JVM_ACC_ABSTRACT;
2068     }
2069     verify_legal_class_modifiers(flags, CHECK_0);
2070     inner_access_flags.set_flags(flags);
2071 
2072     inner_classes->short_at_put(index++, inner_class_info_index);
2073     inner_classes->short_at_put(index++, outer_class_info_index);
2074     inner_classes->short_at_put(index++, inner_name_index);
2075     inner_classes->short_at_put(index++, inner_access_flags.as_short());
2076   }
2077 
2078   // 4347400: make sure there's no duplicate entry in the classes array
2079   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2080     for(int i = 0; i < inner_classes->length(); i += 4) {
2081       for(int j = i + 4; j < inner_classes->length(); j += 4) {
2082         guarantee_property((inner_classes->ushort_at(i)   != inner_classes->ushort_at(j) ||
2083                             inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2084                             inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2085                             inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2086                             "Duplicate entry in InnerClasses in class file %s",
2087                             CHECK_0);
2088       }
2089     }
2090   }
2091 
2092   // Update instanceKlass with inner class info.
2093   k->set_inner_classes(inner_classes());
2094   return length;
2095 }
2096 
2097 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2098   k->set_is_synthetic();
2099 }
2100 
2101 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2102   ClassFileStream* cfs = stream();
2103   u2 signature_index = cfs->get_u2(CHECK);
2104   check_property(
2105     valid_cp_range(signature_index, cp->length()) &&
2106       cp->tag_at(signature_index).is_utf8(),
2107     "Invalid constant pool index %u in Signature attribute in class file %s",
2108     signature_index, CHECK);
2109   k->set_generic_signature(cp->symbol_at(signature_index));
2110 }
2111 
2112 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2113   ClassFileStream* cfs = stream();
2114   // Set inner classes attribute to default sentinel
2115   k->set_inner_classes(Universe::the_empty_short_array());
2116   cfs->guarantee_more(2, CHECK);  // attributes_count
2117   u2 attributes_count = cfs->get_u2_fast();
2118   bool parsed_sourcefile_attribute = false;
2119   bool parsed_innerclasses_attribute = false;
2120   bool parsed_enclosingmethod_attribute = false;
2121   u1* runtime_visible_annotations = NULL;
2122   int runtime_visible_annotations_length = 0;
2123   u1* runtime_invisible_annotations = NULL;
2124   int runtime_invisible_annotations_length = 0;
2125   // Iterate over attributes
2126   while (attributes_count--) {
2127     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
2128     u2 attribute_name_index = cfs->get_u2_fast();
2129     u4 attribute_length = cfs->get_u4_fast();
2130     check_property(
2131       valid_cp_range(attribute_name_index, cp->length()) &&
2132         cp->tag_at(attribute_name_index).is_utf8(),
2133       "Attribute name has bad constant pool index %u in class file %s",
2134       attribute_name_index, CHECK);
2135     symbolOop tag = cp->symbol_at(attribute_name_index);
2136     if (tag == vmSymbols::tag_source_file()) {
2137       // Check for SourceFile tag
2138       if (_need_verify) {
2139         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2140       }
2141       if (parsed_sourcefile_attribute) {
2142         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2143       } else {
2144         parsed_sourcefile_attribute = true;
2145       }
2146       parse_classfile_sourcefile_attribute(cp, k, CHECK);
2147     } else if (tag == vmSymbols::tag_source_debug_extension()) {
2148       // Check for SourceDebugExtension tag
2149       parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2150     } else if (tag == vmSymbols::tag_inner_classes()) {
2151       // Check for InnerClasses tag
2152       if (parsed_innerclasses_attribute) {
2153         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2154       } else {
2155         parsed_innerclasses_attribute = true;
2156       }
2157       u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2158       if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2159         guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2160                           "Wrong InnerClasses attribute length in class file %s", CHECK);
2161       }
2162     } else if (tag == vmSymbols::tag_synthetic()) {
2163       // Check for Synthetic tag
2164       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2165       if (attribute_length != 0) {
2166         classfile_parse_error(
2167           "Invalid Synthetic classfile attribute length %u in class file %s",
2168           attribute_length, CHECK);
2169       }
2170       parse_classfile_synthetic_attribute(cp, k, CHECK);
2171     } else if (tag == vmSymbols::tag_deprecated()) {
2172       // Check for Deprecatd tag - 4276120
2173       if (attribute_length != 0) {
2174         classfile_parse_error(
2175           "Invalid Deprecated classfile attribute length %u in class file %s",
2176           attribute_length, CHECK);
2177       }
2178     } else if (_major_version >= JAVA_1_5_VERSION) {
2179       if (tag == vmSymbols::tag_signature()) {
2180         if (attribute_length != 2) {
2181           classfile_parse_error(
2182             "Wrong Signature attribute length %u in class file %s",
2183             attribute_length, CHECK);
2184         }
2185         parse_classfile_signature_attribute(cp, k, CHECK);
2186       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2187         runtime_visible_annotations_length = attribute_length;
2188         runtime_visible_annotations = cfs->get_u1_buffer();
2189         assert(runtime_visible_annotations != NULL, "null visible annotations");
2190         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2191       } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2192         runtime_invisible_annotations_length = attribute_length;
2193         runtime_invisible_annotations = cfs->get_u1_buffer();
2194         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2195         cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2196       } else if (tag == vmSymbols::tag_enclosing_method()) {
2197         if (parsed_enclosingmethod_attribute) {
2198           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2199         }   else {
2200           parsed_enclosingmethod_attribute = true;
2201         }
2202         cfs->guarantee_more(4, CHECK);  // class_index, method_index
2203         u2 class_index  = cfs->get_u2_fast();
2204         u2 method_index = cfs->get_u2_fast();
2205         if (class_index == 0) {
2206           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2207         }
2208         // Validate the constant pool indices and types
2209         if (!cp->is_within_bounds(class_index) ||
2210             !is_klass_reference(cp, class_index)) {
2211           classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2212         }
2213         if (method_index != 0 &&
2214             (!cp->is_within_bounds(method_index) ||
2215              !cp->tag_at(method_index).is_name_and_type())) {
2216           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2217         }
2218         k->set_enclosing_method_indices(class_index, method_index);
2219       } else {
2220         // Unknown attribute
2221         cfs->skip_u1(attribute_length, CHECK);
2222       }
2223     } else {
2224       // Unknown attribute
2225       cfs->skip_u1(attribute_length, CHECK);
2226     }
2227   }
2228   typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2229                                                      runtime_visible_annotations_length,
2230                                                      runtime_invisible_annotations,
2231                                                      runtime_invisible_annotations_length,
2232                                                      CHECK);
2233   k->set_class_annotations(annotations());
2234 }
2235 
2236 
2237 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2238                                                       int runtime_visible_annotations_length,
2239                                                       u1* runtime_invisible_annotations,
2240                                                       int runtime_invisible_annotations_length, TRAPS) {
2241   typeArrayHandle annotations;
2242   if (runtime_visible_annotations != NULL ||
2243       runtime_invisible_annotations != NULL) {
2244     typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2245                                                             runtime_invisible_annotations_length, CHECK_(annotations));
2246     annotations = typeArrayHandle(THREAD, anno);
2247     if (runtime_visible_annotations != NULL) {
2248       memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2249     }
2250     if (runtime_invisible_annotations != NULL) {
2251       memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2252     }
2253   }
2254   return annotations;
2255 }
2256 
2257 
2258 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2259   KlassHandle h_k (THREAD, fd->field_holder());
2260   assert(h_k.not_null() && fd->is_static(), "just checking");
2261   if (fd->has_initial_value()) {
2262     BasicType t = fd->field_type();
2263     switch (t) {
2264       case T_BYTE:
2265         h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2266               break;
2267       case T_BOOLEAN:
2268         h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2269               break;
2270       case T_CHAR:
2271         h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2272               break;
2273       case T_SHORT:
2274         h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2275               break;
2276       case T_INT:
2277         h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2278         break;
2279       case T_FLOAT:
2280         h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2281         break;
2282       case T_DOUBLE:
2283         h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2284         break;
2285       case T_LONG:
2286         h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2287         break;
2288       case T_OBJECT:
2289         {
2290           #ifdef ASSERT
2291           symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2292           assert(fd->signature() == sym, "just checking");
2293           #endif
2294           oop string = fd->string_initial_value(CHECK);
2295           h_k()->obj_field_put(fd->offset(), string);
2296         }
2297         break;
2298       default:
2299         THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2300                   "Illegal ConstantValue attribute in class file");
2301     }
2302   }
2303 }
2304 
2305 
2306 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2307   constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2308   // This code is for compatibility with earlier jdk's that do not
2309   // have the "discovered" field in java.lang.ref.Reference.  For 1.5
2310   // the check for the "discovered" field should issue a warning if
2311   // the field is not found.  For 1.6 this code should be issue a
2312   // fatal error if the "discovered" field is not found.
2313   //
2314   // Increment fac.nonstatic_oop_count so that the start of the
2315   // next type of non-static oops leaves room for the fake oop.
2316   // Do not increment next_nonstatic_oop_offset so that the
2317   // fake oop is place after the java.lang.ref.Reference oop
2318   // fields.
2319   //
2320   // Check the fields in java.lang.ref.Reference for the "discovered"
2321   // field.  If it is not present, artifically create a field for it.
2322   // This allows this VM to run on early JDK where the field is not
2323   // present.
2324 
2325   //
2326   // Increment fac.nonstatic_oop_count so that the start of the
2327   // next type of non-static oops leaves room for the fake oop.
2328   // Do not increment next_nonstatic_oop_offset so that the
2329   // fake oop is place after the java.lang.ref.Reference oop
2330   // fields.
2331   //
2332   // Check the fields in java.lang.ref.Reference for the "discovered"
2333   // field.  If it is not present, artifically create a field for it.
2334   // This allows this VM to run on early JDK where the field is not
2335   // present.
2336   int reference_sig_index = 0;
2337   int reference_name_index = 0;
2338   int reference_index = 0;
2339   int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2340   const int n = (*fields_ptr)()->length();
2341   for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2342     int name_index =
2343     (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2344     int sig_index  =
2345       (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2346     symbolOop f_name = cp->symbol_at(name_index);
2347     symbolOop f_sig  = cp->symbol_at(sig_index);
2348     if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2349       // Save the index for reference signature for later use.
2350       // The fake discovered field does not entries in the
2351       // constant pool so the index for its signature cannot
2352       // be extracted from the constant pool.  It will need
2353       // later, however.  It's signature is vmSymbols::reference_signature()
2354       // so same an index for that signature.
2355       reference_sig_index = sig_index;
2356       reference_name_index = name_index;
2357       reference_index = i;
2358     }
2359     if (f_name == vmSymbols::reference_discovered_name() &&
2360       f_sig == vmSymbols::reference_signature()) {
2361       // The values below are fake but will force extra
2362       // non-static oop fields and a corresponding non-static
2363       // oop map block to be allocated.
2364       extra = 0;
2365       break;
2366     }
2367   }
2368   if (extra != 0) {
2369     fac_ptr->nonstatic_oop_count += extra;
2370     // Add the additional entry to "fields" so that the klass
2371     // contains the "discoverd" field and the field will be initialized
2372     // in instances of the object.
2373     int fields_with_fix_length = (*fields_ptr)()->length() +
2374       instanceKlass::next_offset;
2375     typeArrayOop ff = oopFactory::new_permanent_shortArray(
2376                                                 fields_with_fix_length, CHECK);
2377     typeArrayHandle fields_with_fix(THREAD, ff);
2378 
2379     // Take everything from the original but the length.
2380     for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2381       fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2382     }
2383 
2384     // Add the fake field at the end.
2385     int i = (*fields_ptr)->length();
2386     // There is no name index for the fake "discovered" field nor
2387     // signature but a signature is needed so that the field will
2388     // be properly initialized.  Use one found for
2389     // one of the other reference fields. Be sure the index for the
2390     // name is 0.  In fieldDescriptor::initialize() the index of the
2391     // name is checked.  That check is by passed for the last nonstatic
2392     // oop field in a java.lang.ref.Reference which is assumed to be
2393     // this artificial "discovered" field.  An assertion checks that
2394     // the name index is 0.
2395     assert(reference_index != 0, "Missing signature for reference");
2396 
2397     int j;
2398     for (j = 0; j < instanceKlass::next_offset; j++) {
2399       fields_with_fix->ushort_at_put(i + j,
2400         (*fields_ptr)->ushort_at(reference_index +j));
2401     }
2402     // Clear the public access flag and set the private access flag.
2403     short flags;
2404     flags =
2405       fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2406     assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2407     flags = flags & (~JVM_ACC_PUBLIC);
2408     flags = flags | JVM_ACC_PRIVATE;
2409     AccessFlags access_flags;
2410     access_flags.set_flags(flags);
2411     assert(!access_flags.is_public(), "Failed to clear public flag");
2412     assert(access_flags.is_private(), "Failed to set private flag");
2413     fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2414       flags);
2415 
2416     assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2417       == reference_name_index, "The fake reference name is incorrect");
2418     assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2419       == reference_sig_index, "The fake reference signature is incorrect");
2420     // The type of the field is stored in the low_offset entry during
2421     // parsing.
2422     assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2423       NONSTATIC_OOP, "The fake reference type is incorrect");
2424 
2425     // "fields" is allocated in the permanent generation.  Disgard
2426     // it and let it be collected.
2427     (*fields_ptr) = fields_with_fix;
2428   }
2429   return;
2430 }
2431 
2432 
2433 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2434   FieldAllocationCount *fac_ptr, TRAPS) {
2435   // Add fake fields for java.lang.Class instances
2436   //
2437   // This is not particularly nice. We should consider adding a
2438   // private transient object field at the Java level to
2439   // java.lang.Class. Alternatively we could add a subclass of
2440   // instanceKlass which provides an accessor and size computer for
2441   // this field, but that appears to be more code than this hack.
2442   //
2443   // NOTE that we wedge these in at the beginning rather than the
2444   // end of the object because the Class layout changed between JDK
2445   // 1.3 and JDK 1.4 with the new reflection implementation; some
2446   // nonstatic oop fields were added at the Java level. The offsets
2447   // of these fake fields can't change between these two JDK
2448   // versions because when the offsets are computed at bootstrap
2449   // time we don't know yet which version of the JDK we're running in.
2450 
2451   // The values below are fake but will force two non-static oop fields and
2452   // a corresponding non-static oop map block to be allocated.
2453   const int extra = java_lang_Class::number_of_fake_oop_fields;
2454   fac_ptr->nonstatic_oop_count += extra;
2455 }
2456 
2457 
2458 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2459   // Cause the extra fake fields in java.lang.Class to show up before
2460   // the Java fields for layout compatibility between 1.3 and 1.4
2461   // Incrementing next_nonstatic_oop_offset here advances the
2462   // location where the real java fields are placed.
2463   const int extra = java_lang_Class::number_of_fake_oop_fields;
2464   (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2465 }
2466 
2467 
2468 // Force MethodHandle.vmentry to be an unmanaged pointer.
2469 // There is no way for a classfile to express this, so we must help it.
2470 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2471                                                     typeArrayHandle* fields_ptr,
2472                                                     FieldAllocationCount *fac_ptr,
2473                                                     TRAPS) {
2474   // Add fake fields for java.dyn.MethodHandle instances
2475   //
2476   // This is not particularly nice, but since there is no way to express
2477   // a native wordSize field in Java, we must do it at this level.
2478 
2479   if (!EnableMethodHandles)  return;
2480 
2481   int word_sig_index = 0;
2482   const int cp_size = cp->length();
2483   for (int index = 1; index < cp_size; index++) {
2484     if (cp->tag_at(index).is_utf8() &&
2485         cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2486       word_sig_index = index;
2487       break;
2488     }
2489   }
2490 
2491   if (word_sig_index == 0)
2492     THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2493               "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2494 
2495   bool found_vmentry = false;
2496 
2497   const int n = (*fields_ptr)()->length();
2498   for (int i = 0; i < n; i += instanceKlass::next_offset) {
2499     int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2500     int sig_index  = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2501     int acc_flags  = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2502     symbolOop f_name = cp->symbol_at(name_index);
2503     symbolOop f_sig  = cp->symbol_at(sig_index);
2504     if (f_sig == vmSymbols::byte_signature() &&
2505         f_name == vmSymbols::vmentry_name() &&
2506         (acc_flags & JVM_ACC_STATIC) == 0) {
2507       // Adjust the field type from byte to an unmanaged pointer.
2508       assert(fac_ptr->nonstatic_byte_count > 0, "");
2509       fac_ptr->nonstatic_byte_count -= 1;
2510       (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset,
2511                                    word_sig_index);
2512       fac_ptr->nonstatic_word_count += 1;
2513 
2514       FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset);
2515       assert(atype == NONSTATIC_BYTE, "");
2516       FieldAllocationType new_atype = NONSTATIC_WORD;
2517       (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2518 
2519       found_vmentry = true;
2520       break;
2521     }
2522   }
2523 
2524   if (!found_vmentry)
2525     THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2526               "missing vmentry byte field in java.dyn.MethodHandle");
2527 
2528 }
2529 
2530 
2531 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2532                                                     Handle class_loader,
2533                                                     Handle protection_domain,
2534                                                     KlassHandle host_klass,
2535                                                     GrowableArray<Handle>* cp_patches,
2536                                                     symbolHandle& parsed_name,
2537                                                     bool verify,
2538                                                     TRAPS) {
2539   // So that JVMTI can cache class file in the state before retransformable agents
2540   // have modified it
2541   unsigned char *cached_class_file_bytes = NULL;
2542   jint cached_class_file_length;
2543 
2544   ClassFileStream* cfs = stream();
2545   // Timing
2546   assert(THREAD->is_Java_thread(), "must be a JavaThread");
2547   JavaThread* jt = (JavaThread*) THREAD;
2548 
2549   PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2550                             ClassLoader::perf_class_parse_selftime(),
2551                             NULL,
2552                             jt->get_thread_stat()->perf_recursion_counts_addr(),
2553                             jt->get_thread_stat()->perf_timers_addr(),
2554                             PerfClassTraceTime::PARSE_CLASS);
2555 
2556   _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2557 
2558   if (JvmtiExport::should_post_class_file_load_hook()) {
2559     unsigned char* ptr = cfs->buffer();
2560     unsigned char* end_ptr = cfs->buffer() + cfs->length();
2561 
2562     JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2563                                            &ptr, &end_ptr,
2564                                            &cached_class_file_bytes,
2565                                            &cached_class_file_length);
2566 
2567     if (ptr != cfs->buffer()) {
2568       // JVMTI agent has modified class file data.
2569       // Set new class file stream using JVMTI agent modified
2570       // class file data.
2571       cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2572       set_stream(cfs);
2573     }
2574   }
2575 
2576   _host_klass = host_klass;
2577   _cp_patches = cp_patches;
2578 
2579   instanceKlassHandle nullHandle;
2580 
2581   // Figure out whether we can skip format checking (matching classic VM behavior)
2582   _need_verify = Verifier::should_verify_for(class_loader(), verify);
2583 
2584   // Set the verify flag in stream
2585   cfs->set_verify(_need_verify);
2586 
2587   // Save the class file name for easier error message printing.
2588   _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2589 
2590   cfs->guarantee_more(8, CHECK_(nullHandle));  // magic, major, minor
2591   // Magic value
2592   u4 magic = cfs->get_u4_fast();
2593   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2594                      "Incompatible magic value %u in class file %s",
2595                      magic, CHECK_(nullHandle));
2596 
2597   // Version numbers
2598   u2 minor_version = cfs->get_u2_fast();
2599   u2 major_version = cfs->get_u2_fast();
2600 
2601   // Check version numbers - we check this even with verifier off
2602   if (!is_supported_version(major_version, minor_version)) {
2603     if (name.is_null()) {
2604       Exceptions::fthrow(
2605         THREAD_AND_LOCATION,
2606         vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2607         "Unsupported major.minor version %u.%u",
2608         major_version,
2609         minor_version);
2610     } else {
2611       ResourceMark rm(THREAD);
2612       Exceptions::fthrow(
2613         THREAD_AND_LOCATION,
2614         vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2615         "%s : Unsupported major.minor version %u.%u",
2616         name->as_C_string(),
2617         major_version,
2618         minor_version);
2619     }
2620     return nullHandle;
2621   }
2622 
2623   _major_version = major_version;
2624   _minor_version = minor_version;
2625 
2626 
2627   // Check if verification needs to be relaxed for this class file
2628   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2629   _relax_verify = Verifier::relax_verify_for(class_loader());
2630 
2631   // Constant pool
2632   constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2633   int cp_size = cp->length();
2634 
2635   cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
2636 
2637   // Access flags
2638   AccessFlags access_flags;
2639   jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2640 
2641   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2642     // Set abstract bit for old class files for backward compatibility
2643     flags |= JVM_ACC_ABSTRACT;
2644   }
2645   verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2646   access_flags.set_flags(flags);
2647 
2648   // This class and superclass
2649   instanceKlassHandle super_klass;
2650   u2 this_class_index = cfs->get_u2_fast();
2651   check_property(
2652     valid_cp_range(this_class_index, cp_size) &&
2653       cp->tag_at(this_class_index).is_unresolved_klass(),
2654     "Invalid this class index %u in constant pool in class file %s",
2655     this_class_index, CHECK_(nullHandle));
2656 
2657   symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2658   assert(class_name.not_null(), "class_name can't be null");
2659 
2660   // It's important to set parsed_name *before* resolving the super class.
2661   // (it's used for cleanup by the caller if parsing fails)
2662   parsed_name = class_name;
2663 
2664   // Update _class_name which could be null previously to be class_name
2665   _class_name = class_name;
2666 
2667   // Don't need to check whether this class name is legal or not.
2668   // It has been checked when constant pool is parsed.
2669   // However, make sure it is not an array type.
2670   if (_need_verify) {
2671     guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2672                        "Bad class name in class file %s",
2673                        CHECK_(nullHandle));
2674   }
2675 
2676   klassOop preserve_this_klass;   // for storing result across HandleMark
2677 
2678   // release all handles when parsing is done
2679   { HandleMark hm(THREAD);
2680 
2681     // Checks if name in class file matches requested name
2682     if (name.not_null() && class_name() != name()) {
2683       ResourceMark rm(THREAD);
2684       Exceptions::fthrow(
2685         THREAD_AND_LOCATION,
2686         vmSymbolHandles::java_lang_NoClassDefFoundError(),
2687         "%s (wrong name: %s)",
2688         name->as_C_string(),
2689         class_name->as_C_string()
2690       );
2691       return nullHandle;
2692     }
2693 
2694     if (TraceClassLoadingPreorder) {
2695       tty->print("[Loading %s", name()->as_klass_external_name());
2696       if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2697       tty->print_cr("]");
2698     }
2699 
2700     u2 super_class_index = cfs->get_u2_fast();
2701     if (super_class_index == 0) {
2702       check_property(class_name() == vmSymbols::java_lang_Object(),
2703                      "Invalid superclass index %u in class file %s",
2704                      super_class_index,
2705                      CHECK_(nullHandle));
2706     } else {
2707       check_property(valid_cp_range(super_class_index, cp_size) &&
2708                      is_klass_reference(cp, super_class_index),
2709                      "Invalid superclass index %u in class file %s",
2710                      super_class_index,
2711                      CHECK_(nullHandle));
2712       // The class name should be legal because it is checked when parsing constant pool.
2713       // However, make sure it is not an array type.
2714       bool is_array = false;
2715       if (cp->tag_at(super_class_index).is_klass()) {
2716         super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2717         if (_need_verify)
2718           is_array = super_klass->oop_is_array();
2719       } else if (_need_verify) {
2720         is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2721       }
2722       if (_need_verify) {
2723         guarantee_property(!is_array,
2724                           "Bad superclass name in class file %s", CHECK_(nullHandle));
2725       }
2726     }
2727 
2728     // Interfaces
2729     u2 itfs_len = cfs->get_u2_fast();
2730     objArrayHandle local_interfaces;
2731     if (itfs_len == 0) {
2732       local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2733     } else {
2734       local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2735     }
2736 
2737     // Fields (offsets are filled in later)
2738     struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2739     objArrayHandle fields_annotations;
2740     typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2741     // Methods
2742     bool has_final_method = false;
2743     AccessFlags promoted_flags;
2744     promoted_flags.set_flags(0);
2745     // These need to be oop pointers because they are allocated lazily
2746     // inside parse_methods inside a nested HandleMark
2747     objArrayOop methods_annotations_oop = NULL;
2748     objArrayOop methods_parameter_annotations_oop = NULL;
2749     objArrayOop methods_default_annotations_oop = NULL;
2750     objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2751                                            &promoted_flags,
2752                                            &has_final_method,
2753                                            &methods_annotations_oop,
2754                                            &methods_parameter_annotations_oop,
2755                                            &methods_default_annotations_oop,
2756                                            CHECK_(nullHandle));
2757 
2758     objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2759     objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2760     objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2761 
2762     // We check super class after class file is parsed and format is checked
2763     if (super_class_index > 0 && super_klass.is_null()) {
2764       symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2765       if (access_flags.is_interface()) {
2766         // Before attempting to resolve the superclass, check for class format
2767         // errors not checked yet.
2768         guarantee_property(sk() == vmSymbols::java_lang_Object(),
2769                            "Interfaces must have java.lang.Object as superclass in class file %s",
2770                            CHECK_(nullHandle));
2771       }
2772       klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2773                                                            sk,
2774                                                            class_loader,
2775                                                            protection_domain,
2776                                                            true,
2777                                                            CHECK_(nullHandle));
2778 
2779       KlassHandle kh (THREAD, k);
2780       super_klass = instanceKlassHandle(THREAD, kh());
2781       if (LinkWellKnownClasses)  // my super class is well known to me
2782         cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2783     }
2784     if (super_klass.not_null()) {
2785       if (super_klass->is_interface()) {
2786         ResourceMark rm(THREAD);
2787         Exceptions::fthrow(
2788           THREAD_AND_LOCATION,
2789           vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2790           "class %s has interface %s as super class",
2791           class_name->as_klass_external_name(),
2792           super_klass->external_name()
2793         );
2794         return nullHandle;
2795       }
2796       // Make sure super class is not final
2797       if (super_klass->is_final()) {
2798         THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2799       }
2800     }
2801 
2802     // Compute the transitive list of all unique interfaces implemented by this class
2803     objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2804 
2805     // sort methods
2806     typeArrayHandle method_ordering = sort_methods(methods,
2807                                                    methods_annotations,
2808                                                    methods_parameter_annotations,
2809                                                    methods_default_annotations,
2810                                                    CHECK_(nullHandle));
2811 
2812     // promote flags from parse_methods() to the klass' flags
2813     access_flags.add_promoted_flags(promoted_flags.as_int());
2814 
2815     // Size of Java vtable (in words)
2816     int vtable_size = 0;
2817     int itable_size = 0;
2818     int num_miranda_methods = 0;
2819 
2820     klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
2821                                                       num_miranda_methods,
2822                                                       super_klass(),
2823                                                       methods(),
2824                                                       access_flags,
2825                                                       class_loader,
2826                                                       class_name,
2827                                                       local_interfaces(),
2828                                                       CHECK_(nullHandle));
2829 
2830     // Size of Java itable (in words)
2831     itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
2832 
2833     // Field size and offset computation
2834     int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
2835 #ifndef PRODUCT
2836     int orig_nonstatic_field_size = 0;
2837 #endif
2838     int static_field_size = 0;
2839     int next_static_oop_offset;
2840     int next_static_double_offset;
2841     int next_static_word_offset;
2842     int next_static_short_offset;
2843     int next_static_byte_offset;
2844     int next_static_type_offset;
2845     int next_nonstatic_oop_offset;
2846     int next_nonstatic_double_offset;
2847     int next_nonstatic_word_offset;
2848     int next_nonstatic_short_offset;
2849     int next_nonstatic_byte_offset;
2850     int next_nonstatic_type_offset;
2851     int first_nonstatic_oop_offset;
2852     int first_nonstatic_field_offset;
2853     int next_nonstatic_field_offset;
2854 
2855     // Calculate the starting byte offsets
2856     next_static_oop_offset      = (instanceKlass::header_size() +
2857                                   align_object_offset(vtable_size) +
2858                                   align_object_offset(itable_size)) * wordSize;
2859     next_static_double_offset   = next_static_oop_offset +
2860                                   (fac.static_oop_count * heapOopSize);
2861     if ( fac.static_double_count &&
2862          (Universe::field_type_should_be_aligned(T_DOUBLE) ||
2863           Universe::field_type_should_be_aligned(T_LONG)) ) {
2864       next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
2865     }
2866 
2867     next_static_word_offset     = next_static_double_offset +
2868                                   (fac.static_double_count * BytesPerLong);
2869     next_static_short_offset    = next_static_word_offset +
2870                                   (fac.static_word_count * BytesPerInt);
2871     next_static_byte_offset     = next_static_short_offset +
2872                                   (fac.static_short_count * BytesPerShort);
2873     next_static_type_offset     = align_size_up((next_static_byte_offset +
2874                                   fac.static_byte_count ), wordSize );
2875     static_field_size           = (next_static_type_offset -
2876                                   next_static_oop_offset) / wordSize;
2877     first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
2878                                    nonstatic_field_size * heapOopSize;
2879     next_nonstatic_field_offset = first_nonstatic_field_offset;
2880 
2881     // Add fake fields for java.lang.Class instances (also see below)
2882     if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2883       java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
2884     }
2885 
2886     // adjust the vmentry field declaration in java.dyn.MethodHandle
2887     if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
2888       java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
2889     }
2890 
2891     // Add a fake "discovered" field if it is not present
2892     // for compatibility with earlier jdk's.
2893     if (class_name() == vmSymbols::java_lang_ref_Reference()
2894       && class_loader.is_null()) {
2895       java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
2896     }
2897     // end of "discovered" field compactibility fix
2898 
2899     unsigned int nonstatic_double_count = fac.nonstatic_double_count;
2900     unsigned int nonstatic_word_count   = fac.nonstatic_word_count;
2901     unsigned int nonstatic_short_count  = fac.nonstatic_short_count;
2902     unsigned int nonstatic_byte_count   = fac.nonstatic_byte_count;
2903     unsigned int nonstatic_oop_count    = fac.nonstatic_oop_count;
2904 
2905     bool super_has_nonstatic_fields =
2906             (super_klass() != NULL && super_klass->has_nonstatic_fields());
2907     bool has_nonstatic_fields  =  super_has_nonstatic_fields ||
2908             ((nonstatic_double_count + nonstatic_word_count +
2909               nonstatic_short_count + nonstatic_byte_count +
2910               nonstatic_oop_count) != 0);
2911 
2912 
2913     // Prepare list of oops for oop map generation.
2914     int* nonstatic_oop_offsets;
2915     unsigned int* nonstatic_oop_counts;
2916     unsigned int nonstatic_oop_map_count = 0;
2917 
2918     nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
2919               THREAD, int, nonstatic_oop_count + 1);
2920     nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
2921               THREAD, unsigned int, nonstatic_oop_count + 1);
2922 
2923     // Add fake fields for java.lang.Class instances (also see above).
2924     // FieldsAllocationStyle and CompactFields values will be reset to default.
2925     if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
2926       java_lang_Class_fix_post(&next_nonstatic_field_offset);
2927       nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
2928       const uint fake_oop_count = (next_nonstatic_field_offset -
2929                                    first_nonstatic_field_offset) / heapOopSize;
2930       nonstatic_oop_counts[0] = fake_oop_count;
2931       nonstatic_oop_map_count = 1;
2932       nonstatic_oop_count -= fake_oop_count;
2933       first_nonstatic_oop_offset = first_nonstatic_field_offset;
2934     } else {
2935       first_nonstatic_oop_offset = 0; // will be set for first oop field
2936     }
2937 
2938 #ifndef PRODUCT
2939     if( PrintCompactFieldsSavings ) {
2940       next_nonstatic_double_offset = next_nonstatic_field_offset +
2941                                      (nonstatic_oop_count * heapOopSize);
2942       if ( nonstatic_double_count > 0 ) {
2943         next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
2944       }
2945       next_nonstatic_word_offset  = next_nonstatic_double_offset +
2946                                     (nonstatic_double_count * BytesPerLong);
2947       next_nonstatic_short_offset = next_nonstatic_word_offset +
2948                                     (nonstatic_word_count * BytesPerInt);
2949       next_nonstatic_byte_offset  = next_nonstatic_short_offset +
2950                                     (nonstatic_short_count * BytesPerShort);
2951       next_nonstatic_type_offset  = align_size_up((next_nonstatic_byte_offset +
2952                                     nonstatic_byte_count ), heapOopSize );
2953       orig_nonstatic_field_size   = nonstatic_field_size +
2954       ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
2955     }
2956 #endif
2957     bool compact_fields   = CompactFields;
2958     int  allocation_style = FieldsAllocationStyle;
2959     if( allocation_style < 0 || allocation_style > 1 ) { // Out of range?
2960       assert(false, "0 <= FieldsAllocationStyle <= 1");
2961       allocation_style = 1; // Optimistic
2962     }
2963 
2964     // The next classes have predefined hard-coded fields offsets
2965     // (see in JavaClasses::compute_hard_coded_offsets()).
2966     // Use default fields allocation order for them.
2967     if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
2968         (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
2969          class_name() == vmSymbols::java_lang_Class() ||
2970          class_name() == vmSymbols::java_lang_ClassLoader() ||
2971          class_name() == vmSymbols::java_lang_ref_Reference() ||
2972          class_name() == vmSymbols::java_lang_ref_SoftReference() ||
2973          class_name() == vmSymbols::java_lang_StackTraceElement() ||
2974          class_name() == vmSymbols::java_lang_String() ||
2975          class_name() == vmSymbols::java_lang_Throwable() ||
2976          class_name() == vmSymbols::java_lang_Boolean() ||
2977          class_name() == vmSymbols::java_lang_Character() ||
2978          class_name() == vmSymbols::java_lang_Float() ||
2979          class_name() == vmSymbols::java_lang_Double() ||
2980          class_name() == vmSymbols::java_lang_Byte() ||
2981          class_name() == vmSymbols::java_lang_Short() ||
2982          class_name() == vmSymbols::java_lang_Integer() ||
2983          class_name() == vmSymbols::java_lang_Long())) {
2984       allocation_style = 0;     // Allocate oops first
2985       compact_fields   = false; // Don't compact fields
2986     }
2987 
2988     if( allocation_style == 0 ) {
2989       // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
2990       next_nonstatic_oop_offset    = next_nonstatic_field_offset;
2991       next_nonstatic_double_offset = next_nonstatic_oop_offset +
2992                                       (nonstatic_oop_count * heapOopSize);
2993     } else if( allocation_style == 1 ) {
2994       // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
2995       next_nonstatic_double_offset = next_nonstatic_field_offset;
2996     } else {
2997       ShouldNotReachHere();
2998     }
2999 
3000     int nonstatic_oop_space_count   = 0;
3001     int nonstatic_word_space_count  = 0;
3002     int nonstatic_short_space_count = 0;
3003     int nonstatic_byte_space_count  = 0;
3004     int nonstatic_oop_space_offset;
3005     int nonstatic_word_space_offset;
3006     int nonstatic_short_space_offset;
3007     int nonstatic_byte_space_offset;
3008 
3009     if( nonstatic_double_count > 0 ) {
3010       int offset = next_nonstatic_double_offset;
3011       next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3012       if( compact_fields && offset != next_nonstatic_double_offset ) {
3013         // Allocate available fields into the gap before double field.
3014         int length = next_nonstatic_double_offset - offset;
3015         assert(length == BytesPerInt, "");
3016         nonstatic_word_space_offset = offset;
3017         if( nonstatic_word_count > 0 ) {
3018           nonstatic_word_count      -= 1;
3019           nonstatic_word_space_count = 1; // Only one will fit
3020           length -= BytesPerInt;
3021           offset += BytesPerInt;
3022         }
3023         nonstatic_short_space_offset = offset;
3024         while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3025           nonstatic_short_count       -= 1;
3026           nonstatic_short_space_count += 1;
3027           length -= BytesPerShort;
3028           offset += BytesPerShort;
3029         }
3030         nonstatic_byte_space_offset = offset;
3031         while( length > 0 && nonstatic_byte_count > 0 ) {
3032           nonstatic_byte_count       -= 1;
3033           nonstatic_byte_space_count += 1;
3034           length -= 1;
3035         }
3036         // Allocate oop field in the gap if there are no other fields for that.
3037         nonstatic_oop_space_offset = offset;
3038         if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3039             allocation_style != 0 ) { // when oop fields not first
3040           nonstatic_oop_count      -= 1;
3041           nonstatic_oop_space_count = 1; // Only one will fit
3042           length -= heapOopSize;
3043           offset += heapOopSize;
3044         }
3045       }
3046     }
3047 
3048     next_nonstatic_word_offset  = next_nonstatic_double_offset +
3049                                   (nonstatic_double_count * BytesPerLong);
3050     next_nonstatic_short_offset = next_nonstatic_word_offset +
3051                                   (nonstatic_word_count * BytesPerInt);
3052     next_nonstatic_byte_offset  = next_nonstatic_short_offset +
3053                                   (nonstatic_short_count * BytesPerShort);
3054 
3055     int notaligned_offset;
3056     if( allocation_style == 0 ) {
3057       notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3058     } else { // allocation_style == 1
3059       next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3060       if( nonstatic_oop_count > 0 ) {
3061         next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3062       }
3063       notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3064     }
3065     next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3066     nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3067                                    - first_nonstatic_field_offset)/heapOopSize);
3068 
3069     // Iterate over fields again and compute correct offsets.
3070     // The field allocation type was temporarily stored in the offset slot.
3071     // oop fields are located before non-oop fields (static and non-static).
3072     int len = fields->length();
3073     for (int i = 0; i < len; i += instanceKlass::next_offset) {
3074       int real_offset;
3075       FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3076       switch (atype) {
3077         case STATIC_OOP:
3078           real_offset = next_static_oop_offset;
3079           next_static_oop_offset += heapOopSize;
3080           break;
3081         case STATIC_BYTE:
3082           real_offset = next_static_byte_offset;
3083           next_static_byte_offset += 1;
3084           break;
3085         case STATIC_SHORT:
3086           real_offset = next_static_short_offset;
3087           next_static_short_offset += BytesPerShort;
3088           break;
3089         case STATIC_WORD:
3090           real_offset = next_static_word_offset;
3091           next_static_word_offset += BytesPerInt;
3092           break;
3093         case STATIC_ALIGNED_DOUBLE:
3094         case STATIC_DOUBLE:
3095           real_offset = next_static_double_offset;
3096           next_static_double_offset += BytesPerLong;
3097           break;
3098         case NONSTATIC_OOP:
3099           if( nonstatic_oop_space_count > 0 ) {
3100             real_offset = nonstatic_oop_space_offset;
3101             nonstatic_oop_space_offset += heapOopSize;
3102             nonstatic_oop_space_count  -= 1;
3103           } else {
3104             real_offset = next_nonstatic_oop_offset;
3105             next_nonstatic_oop_offset += heapOopSize;
3106           }
3107           // Update oop maps
3108           if( nonstatic_oop_map_count > 0 &&
3109               nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3110               real_offset -
3111               int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3112               heapOopSize ) {
3113             // Extend current oop map
3114             nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3115           } else {
3116             // Create new oop map
3117             nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3118             nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3119             nonstatic_oop_map_count += 1;
3120             if( first_nonstatic_oop_offset == 0 ) { // Undefined
3121               first_nonstatic_oop_offset = real_offset;
3122             }
3123           }
3124           break;
3125         case NONSTATIC_BYTE:
3126           if( nonstatic_byte_space_count > 0 ) {
3127             real_offset = nonstatic_byte_space_offset;
3128             nonstatic_byte_space_offset += 1;
3129             nonstatic_byte_space_count  -= 1;
3130           } else {
3131             real_offset = next_nonstatic_byte_offset;
3132             next_nonstatic_byte_offset += 1;
3133           }
3134           break;
3135         case NONSTATIC_SHORT:
3136           if( nonstatic_short_space_count > 0 ) {
3137             real_offset = nonstatic_short_space_offset;
3138             nonstatic_short_space_offset += BytesPerShort;
3139             nonstatic_short_space_count  -= 1;
3140           } else {
3141             real_offset = next_nonstatic_short_offset;
3142             next_nonstatic_short_offset += BytesPerShort;
3143           }
3144           break;
3145         case NONSTATIC_WORD:
3146           if( nonstatic_word_space_count > 0 ) {
3147             real_offset = nonstatic_word_space_offset;
3148             nonstatic_word_space_offset += BytesPerInt;
3149             nonstatic_word_space_count  -= 1;
3150           } else {
3151             real_offset = next_nonstatic_word_offset;
3152             next_nonstatic_word_offset += BytesPerInt;
3153           }
3154           break;
3155         case NONSTATIC_ALIGNED_DOUBLE:
3156         case NONSTATIC_DOUBLE:
3157           real_offset = next_nonstatic_double_offset;
3158           next_nonstatic_double_offset += BytesPerLong;
3159           break;
3160         default:
3161           ShouldNotReachHere();
3162       }
3163       fields->short_at_put(i + instanceKlass::low_offset,  extract_low_short_from_int(real_offset));
3164       fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3165     }
3166 
3167     // Size of instances
3168     int instance_size;
3169 
3170     next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3171     instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3172 
3173     assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3174 
3175     // Number of non-static oop map blocks allocated at end of klass.
3176     const unsigned int total_oop_map_count =
3177       compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3178                             first_nonstatic_oop_offset);
3179 
3180     // Compute reference type
3181     ReferenceType rt;
3182     if (super_klass() == NULL) {
3183       rt = REF_NONE;
3184     } else {
3185       rt = super_klass->reference_type();
3186     }
3187 
3188     // We can now create the basic klassOop for this klass
3189     klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3190                                                 static_field_size,
3191                                                 total_oop_map_count,
3192                                                 rt, CHECK_(nullHandle));
3193     instanceKlassHandle this_klass (THREAD, ik);
3194 
3195     assert(this_klass->static_field_size() == static_field_size, "sanity");
3196     assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3197            "sanity");
3198 
3199     // Fill in information already parsed
3200     this_klass->set_access_flags(access_flags);
3201     this_klass->set_should_verify_class(verify);
3202     jint lh = Klass::instance_layout_helper(instance_size, false);
3203     this_klass->set_layout_helper(lh);
3204     assert(this_klass->oop_is_instance(), "layout is correct");
3205     assert(this_klass->size_helper() == instance_size, "correct size_helper");
3206     // Not yet: supers are done below to support the new subtype-checking fields
3207     //this_klass->set_super(super_klass());
3208     this_klass->set_class_loader(class_loader());
3209     this_klass->set_nonstatic_field_size(nonstatic_field_size);
3210     this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3211     this_klass->set_static_oop_field_size(fac.static_oop_count);
3212     cp->set_pool_holder(this_klass());
3213     this_klass->set_constants(cp());
3214     this_klass->set_local_interfaces(local_interfaces());
3215     this_klass->set_fields(fields());
3216     this_klass->set_methods(methods());
3217     if (has_final_method) {
3218       this_klass->set_has_final_method();
3219     }
3220     this_klass->set_method_ordering(method_ordering());
3221     // The instanceKlass::_methods_jmethod_ids cache and the
3222     // instanceKlass::_methods_cached_itable_indices cache are
3223     // both managed on the assumption that the initial cache
3224     // size is equal to the number of methods in the class. If
3225     // that changes, then instanceKlass::idnum_can_increment()
3226     // has to be changed accordingly.
3227     this_klass->set_initial_method_idnum(methods->length());
3228     this_klass->set_name(cp->klass_name_at(this_class_index));
3229     if (LinkWellKnownClasses || is_anonymous())  // I am well known to myself
3230       cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3231     this_klass->set_protection_domain(protection_domain());
3232     this_klass->set_fields_annotations(fields_annotations());
3233     this_klass->set_methods_annotations(methods_annotations());
3234     this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3235     this_klass->set_methods_default_annotations(methods_default_annotations());
3236 
3237     this_klass->set_minor_version(minor_version);
3238     this_klass->set_major_version(major_version);
3239 
3240     // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3241     // (We used to do this lazily, but now we query it in Rewriter,
3242     // which is eagerly done for every method, so we might as well do it now,
3243     // when everything is fresh in memory.)
3244     if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3245       for (int j = 0; j < methods->length(); j++) {
3246         ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3247       }
3248     }
3249 
3250     if (cached_class_file_bytes != NULL) {
3251       // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3252       this_klass->set_cached_class_file(cached_class_file_bytes,
3253                                         cached_class_file_length);
3254     }
3255 
3256     // Miranda methods
3257     if ((num_miranda_methods > 0) ||
3258         // if this class introduced new miranda methods or
3259         (super_klass.not_null() && (super_klass->has_miranda_methods()))
3260         // super class exists and this class inherited miranda methods
3261         ) {
3262       this_klass->set_has_miranda_methods(); // then set a flag
3263     }
3264 
3265     // Additional attributes
3266     parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3267 
3268     // Make sure this is the end of class file stream
3269     guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3270 
3271     // Initialize static fields
3272     this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3273 
3274     // VerifyOops believes that once this has been set, the object is completely loaded.
3275     // Compute transitive closure of interfaces this class implements
3276     this_klass->set_transitive_interfaces(transitive_interfaces());
3277 
3278     // Fill in information needed to compute superclasses.
3279     this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3280 
3281     // Initialize itable offset tables
3282     klassItable::setup_itable_offset_table(this_klass);
3283 
3284     // Do final class setup
3285     fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3286 
3287     set_precomputed_flags(this_klass);
3288 
3289     // reinitialize modifiers, using the InnerClasses attribute
3290     int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3291     this_klass->set_modifier_flags(computed_modifiers);
3292 
3293     // check if this class can access its super class
3294     check_super_class_access(this_klass, CHECK_(nullHandle));
3295 
3296     // check if this class can access its superinterfaces
3297     check_super_interface_access(this_klass, CHECK_(nullHandle));
3298 
3299     // check if this class overrides any final method
3300     check_final_method_override(this_klass, CHECK_(nullHandle));
3301 
3302     // check that if this class is an interface then it doesn't have static methods
3303     if (this_klass->is_interface()) {
3304       check_illegal_static_method(this_klass, CHECK_(nullHandle));
3305     }
3306 
3307     ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3308                                              false /* not shared class */);
3309 
3310     if (TraceClassLoading) {
3311       // print in a single call to reduce interleaving of output
3312       if (cfs->source() != NULL) {
3313         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3314                    cfs->source());
3315       } else if (class_loader.is_null()) {
3316         if (THREAD->is_Java_thread()) {
3317           klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3318           tty->print("[Loaded %s by instance of %s]\n",
3319                      this_klass->external_name(),
3320                      instanceKlass::cast(caller)->external_name());
3321         } else {
3322           tty->print("[Loaded %s]\n", this_klass->external_name());
3323         }
3324       } else {
3325         ResourceMark rm;
3326         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3327                    instanceKlass::cast(class_loader->klass())->external_name());
3328       }
3329     }
3330 
3331     if (TraceClassResolution) {
3332       // print out the superclass.
3333       const char * from = Klass::cast(this_klass())->external_name();
3334       if (this_klass->java_super() != NULL) {
3335         tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3336       }
3337       // print out each of the interface classes referred to by this class.
3338       objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3339       if (!local_interfaces.is_null()) {
3340         int length = local_interfaces->length();
3341         for (int i = 0; i < length; i++) {
3342           klassOop k = klassOop(local_interfaces->obj_at(i));
3343           instanceKlass* to_class = instanceKlass::cast(k);
3344           const char * to = to_class->external_name();
3345           tty->print("RESOLVE %s %s (interface)\n", from, to);
3346         }
3347       }
3348     }
3349 
3350 #ifndef PRODUCT
3351     if( PrintCompactFieldsSavings ) {
3352       if( nonstatic_field_size < orig_nonstatic_field_size ) {
3353         tty->print("[Saved %d of %d bytes in %s]\n",
3354                  (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3355                  orig_nonstatic_field_size*heapOopSize,
3356                  this_klass->external_name());
3357       } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3358         tty->print("[Wasted %d over %d bytes in %s]\n",
3359                  (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3360                  orig_nonstatic_field_size*heapOopSize,
3361                  this_klass->external_name());
3362       }
3363     }
3364 #endif
3365 
3366     // preserve result across HandleMark
3367     preserve_this_klass = this_klass();
3368   }
3369 
3370   // Create new handle outside HandleMark
3371   instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3372   debug_only(this_klass->as_klassOop()->verify();)
3373 
3374   return this_klass;
3375 }
3376 
3377 
3378 unsigned int
3379 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3380                                        unsigned int nonstatic_oop_map_count,
3381                                        int first_nonstatic_oop_offset) {
3382   unsigned int map_count =
3383     super.is_null() ? 0 : super->nonstatic_oop_map_count();
3384   if (nonstatic_oop_map_count > 0) {
3385     // We have oops to add to map
3386     if (map_count == 0) {
3387       map_count = nonstatic_oop_map_count;
3388     } else {
3389       // Check whether we should add a new map block or whether the last one can
3390       // be extended
3391       OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3392       OopMapBlock* const last_map = first_map + map_count - 1;
3393 
3394       int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3395       if (next_offset == first_nonstatic_oop_offset) {
3396         // There is no gap bettwen superklass's last oop field and first
3397         // local oop field, merge maps.
3398         nonstatic_oop_map_count -= 1;
3399       } else {
3400         // Superklass didn't end with a oop field, add extra maps
3401         assert(next_offset < first_nonstatic_oop_offset, "just checking");
3402       }
3403       map_count += nonstatic_oop_map_count;
3404     }
3405   }
3406   return map_count;
3407 }
3408 
3409 
3410 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3411                                     unsigned int nonstatic_oop_map_count,
3412                                     int* nonstatic_oop_offsets,
3413                                     unsigned int* nonstatic_oop_counts) {
3414   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3415   const instanceKlass* const super = k->superklass();
3416   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3417   if (super_count > 0) {
3418     // Copy maps from superklass
3419     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3420     for (unsigned int i = 0; i < super_count; ++i) {
3421       *this_oop_map++ = *super_oop_map++;
3422     }
3423   }
3424 
3425   if (nonstatic_oop_map_count > 0) {
3426     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3427       // The counts differ because there is no gap between superklass's last oop
3428       // field and the first local oop field.  Extend the last oop map copied
3429       // from the superklass instead of creating new one.
3430       nonstatic_oop_map_count--;
3431       nonstatic_oop_offsets++;
3432       this_oop_map--;
3433       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3434       this_oop_map++;
3435     }
3436 
3437     // Add new map blocks, fill them
3438     while (nonstatic_oop_map_count-- > 0) {
3439       this_oop_map->set_offset(*nonstatic_oop_offsets++);
3440       this_oop_map->set_count(*nonstatic_oop_counts++);
3441       this_oop_map++;
3442     }
3443     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3444            this_oop_map, "sanity");
3445   }
3446 }
3447 
3448 
3449 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3450   klassOop super = k->super();
3451 
3452   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3453   // in which case we don't have to register objects as finalizable
3454   if (!_has_empty_finalizer) {
3455     if (_has_finalizer ||
3456         (super != NULL && super->klass_part()->has_finalizer())) {
3457       k->set_has_finalizer();
3458     }
3459   }
3460 
3461 #ifdef ASSERT
3462   bool f = false;
3463   methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3464                                  vmSymbols::void_method_signature());
3465   if (m != NULL && !m->is_empty_method()) {
3466     f = true;
3467   }
3468   assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3469 #endif
3470 
3471   // Check if this klass supports the java.lang.Cloneable interface
3472   if (SystemDictionary::cloneable_klass_loaded()) {
3473     if (k->is_subtype_of(SystemDictionary::cloneable_klass())) {
3474       k->set_is_cloneable();
3475     }
3476   }
3477 
3478   // Check if this klass has a vanilla default constructor
3479   if (super == NULL) {
3480     // java.lang.Object has empty default constructor
3481     k->set_has_vanilla_constructor();
3482   } else {
3483     if (Klass::cast(super)->has_vanilla_constructor() &&
3484         _has_vanilla_constructor) {
3485       k->set_has_vanilla_constructor();
3486     }
3487 #ifdef ASSERT
3488     bool v = false;
3489     if (Klass::cast(super)->has_vanilla_constructor()) {
3490       methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3491 ), vmSymbols::void_method_signature());
3492       if (constructor != NULL && constructor->is_vanilla_constructor()) {
3493         v = true;
3494       }
3495     }
3496     assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3497 #endif
3498   }
3499 
3500   // If it cannot be fast-path allocated, set a bit in the layout helper.
3501   // See documentation of instanceKlass::can_be_fastpath_allocated().
3502   assert(k->size_helper() > 0, "layout_helper is initialized");
3503   if ((!RegisterFinalizersAtInit && k->has_finalizer())
3504       || k->is_abstract() || k->is_interface()
3505       || (k->name() == vmSymbols::java_lang_Class()
3506           && k->class_loader() == NULL)
3507       || k->size_helper() >= FastAllocateSizeLimit) {
3508     // Forbid fast-path allocation.
3509     jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3510     k->set_layout_helper(lh);
3511   }
3512 }
3513 
3514 
3515 // utility method for appending and array with check for duplicates
3516 
3517 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3518   // iterate over new interfaces
3519   for (int i = 0; i < ifs->length(); i++) {
3520     oop e = ifs->obj_at(i);
3521     assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3522     // check for duplicates
3523     bool duplicate = false;
3524     for (int j = 0; j < index; j++) {
3525       if (result->obj_at(j) == e) {
3526         duplicate = true;
3527         break;
3528       }
3529     }
3530     // add new interface
3531     if (!duplicate) {
3532       result->obj_at_put(index++, e);
3533     }
3534   }
3535 }
3536 
3537 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3538   // Compute maximum size for transitive interfaces
3539   int max_transitive_size = 0;
3540   int super_size = 0;
3541   // Add superclass transitive interfaces size
3542   if (super.not_null()) {
3543     super_size = super->transitive_interfaces()->length();
3544     max_transitive_size += super_size;
3545   }
3546   // Add local interfaces' super interfaces
3547   int local_size = local_ifs->length();
3548   for (int i = 0; i < local_size; i++) {
3549     klassOop l = klassOop(local_ifs->obj_at(i));
3550     max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3551   }
3552   // Finally add local interfaces
3553   max_transitive_size += local_size;
3554   // Construct array
3555   objArrayHandle result;
3556   if (max_transitive_size == 0) {
3557     // no interfaces, use canonicalized array
3558     result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3559   } else if (max_transitive_size == super_size) {
3560     // no new local interfaces added, share superklass' transitive interface array
3561     result = objArrayHandle(THREAD, super->transitive_interfaces());
3562   } else if (max_transitive_size == local_size) {
3563     // only local interfaces added, share local interface array
3564     result = local_ifs;
3565   } else {
3566     objArrayHandle nullHandle;
3567     objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3568     result = objArrayHandle(THREAD, new_objarray);
3569     int index = 0;
3570     // Copy down from superclass
3571     if (super.not_null()) {
3572       append_interfaces(result, index, super->transitive_interfaces());
3573     }
3574     // Copy down from local interfaces' superinterfaces
3575     for (int i = 0; i < local_ifs->length(); i++) {
3576       klassOop l = klassOop(local_ifs->obj_at(i));
3577       append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3578     }
3579     // Finally add local interfaces
3580     append_interfaces(result, index, local_ifs());
3581 
3582     // Check if duplicates were removed
3583     if (index != max_transitive_size) {
3584       assert(index < max_transitive_size, "just checking");
3585       objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3586       for (int i = 0; i < index; i++) {
3587         oop e = result->obj_at(i);
3588         assert(e != NULL, "just checking");
3589         new_result->obj_at_put(i, e);
3590       }
3591       result = objArrayHandle(THREAD, new_result);
3592     }
3593   }
3594   return result;
3595 }
3596 
3597 
3598 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3599   klassOop super = this_klass->super();
3600   if ((super != NULL) &&
3601       (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3602     ResourceMark rm(THREAD);
3603     Exceptions::fthrow(
3604       THREAD_AND_LOCATION,
3605       vmSymbolHandles::java_lang_IllegalAccessError(),
3606       "class %s cannot access its superclass %s",
3607       this_klass->external_name(),
3608       instanceKlass::cast(super)->external_name()
3609     );
3610     return;
3611   }
3612 }
3613 
3614 
3615 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3616   objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3617   int lng = local_interfaces->length();
3618   for (int i = lng - 1; i >= 0; i--) {
3619     klassOop k = klassOop(local_interfaces->obj_at(i));
3620     assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3621     if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3622       ResourceMark rm(THREAD);
3623       Exceptions::fthrow(
3624         THREAD_AND_LOCATION,
3625         vmSymbolHandles::java_lang_IllegalAccessError(),
3626         "class %s cannot access its superinterface %s",
3627         this_klass->external_name(),
3628         instanceKlass::cast(k)->external_name()
3629       );
3630       return;
3631     }
3632   }
3633 }
3634 
3635 
3636 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3637   objArrayHandle methods (THREAD, this_klass->methods());
3638   int num_methods = methods->length();
3639 
3640   // go thru each method and check if it overrides a final method
3641   for (int index = 0; index < num_methods; index++) {
3642     methodOop m = (methodOop)methods->obj_at(index);
3643 
3644     // skip private, static and <init> methods
3645     if ((!m->is_private()) &&
3646         (!m->is_static()) &&
3647         (m->name() != vmSymbols::object_initializer_name())) {
3648 
3649       symbolOop name = m->name();
3650       symbolOop signature = m->signature();
3651       klassOop k = this_klass->super();
3652       methodOop super_m = NULL;
3653       while (k != NULL) {
3654         // skip supers that don't have final methods.
3655         if (k->klass_part()->has_final_method()) {
3656           // lookup a matching method in the super class hierarchy
3657           super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3658           if (super_m == NULL) {
3659             break; // didn't find any match; get out
3660           }
3661 
3662           if (super_m->is_final() &&
3663               // matching method in super is final
3664               (Reflection::verify_field_access(this_klass->as_klassOop(),
3665                                                super_m->method_holder(),
3666                                                super_m->method_holder(),
3667                                                super_m->access_flags(), false))
3668             // this class can access super final method and therefore override
3669             ) {
3670             ResourceMark rm(THREAD);
3671             Exceptions::fthrow(
3672               THREAD_AND_LOCATION,
3673               vmSymbolHandles::java_lang_VerifyError(),
3674               "class %s overrides final method %s.%s",
3675               this_klass->external_name(),
3676               name->as_C_string(),
3677               signature->as_C_string()
3678             );
3679             return;
3680           }
3681 
3682           // continue to look from super_m's holder's super.
3683           k = instanceKlass::cast(super_m->method_holder())->super();
3684           continue;
3685         }
3686 
3687         k = k->klass_part()->super();
3688       }
3689     }
3690   }
3691 }
3692 
3693 
3694 // assumes that this_klass is an interface
3695 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3696   assert(this_klass->is_interface(), "not an interface");
3697   objArrayHandle methods (THREAD, this_klass->methods());
3698   int num_methods = methods->length();
3699 
3700   for (int index = 0; index < num_methods; index++) {
3701     methodOop m = (methodOop)methods->obj_at(index);
3702     // if m is static and not the init method, throw a verify error
3703     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3704       ResourceMark rm(THREAD);
3705       Exceptions::fthrow(
3706         THREAD_AND_LOCATION,
3707         vmSymbolHandles::java_lang_VerifyError(),
3708         "Illegal static method %s in interface %s",
3709         m->name()->as_C_string(),
3710         this_klass->external_name()
3711       );
3712       return;
3713     }
3714   }
3715 }
3716 
3717 // utility methods for format checking
3718 
3719 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3720   if (!_need_verify) { return; }
3721 
3722   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
3723   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
3724   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
3725   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
3726   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
3727   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3728   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
3729 
3730   if ((is_abstract && is_final) ||
3731       (is_interface && !is_abstract) ||
3732       (is_interface && major_gte_15 && (is_super || is_enum)) ||
3733       (!is_interface && major_gte_15 && is_annotation)) {
3734     ResourceMark rm(THREAD);
3735     Exceptions::fthrow(
3736       THREAD_AND_LOCATION,
3737       vmSymbolHandles::java_lang_ClassFormatError(),
3738       "Illegal class modifiers in class %s: 0x%X",
3739       _class_name->as_C_string(), flags
3740     );
3741     return;
3742   }
3743 }
3744 
3745 bool ClassFileParser::has_illegal_visibility(jint flags) {
3746   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
3747   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3748   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
3749 
3750   return ((is_public && is_protected) ||
3751           (is_public && is_private) ||
3752           (is_protected && is_private));
3753 }
3754 
3755 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3756   u2 max_version = JDK_Version::is_gte_jdk17x_version() ?
3757     JAVA_MAX_SUPPORTED_VERSION : JAVA_6_VERSION;
3758   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3759          (major <= max_version) &&
3760          ((major != max_version) ||
3761           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3762 }
3763 
3764 void ClassFileParser::verify_legal_field_modifiers(
3765     jint flags, bool is_interface, TRAPS) {
3766   if (!_need_verify) { return; }
3767 
3768   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
3769   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3770   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
3771   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
3772   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
3773   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
3774   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3775   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
3776   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3777 
3778   bool is_illegal = false;
3779 
3780   if (is_interface) {
3781     if (!is_public || !is_static || !is_final || is_private ||
3782         is_protected || is_volatile || is_transient ||
3783         (major_gte_15 && is_enum)) {
3784       is_illegal = true;
3785     }
3786   } else { // not interface
3787     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
3788       is_illegal = true;
3789     }
3790   }
3791 
3792   if (is_illegal) {
3793     ResourceMark rm(THREAD);
3794     Exceptions::fthrow(
3795       THREAD_AND_LOCATION,
3796       vmSymbolHandles::java_lang_ClassFormatError(),
3797       "Illegal field modifiers in class %s: 0x%X",
3798       _class_name->as_C_string(), flags);
3799     return;
3800   }
3801 }
3802 
3803 void ClassFileParser::verify_legal_method_modifiers(
3804     jint flags, bool is_interface, symbolHandle name, TRAPS) {
3805   if (!_need_verify) { return; }
3806 
3807   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
3808   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
3809   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
3810   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
3811   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
3812   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
3813   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
3814   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
3815   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
3816   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
3817   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
3818 
3819   bool is_illegal = false;
3820 
3821   if (is_interface) {
3822     if (!is_abstract || !is_public || is_static || is_final ||
3823         is_native || (major_gte_15 && (is_synchronized || is_strict))) {
3824       is_illegal = true;
3825     }
3826   } else { // not interface
3827     if (is_initializer) {
3828       if (is_static || is_final || is_synchronized || is_native ||
3829           is_abstract || (major_gte_15 && is_bridge)) {
3830         is_illegal = true;
3831       }
3832     } else { // not initializer
3833       if (is_abstract) {
3834         if ((is_final || is_native || is_private || is_static ||
3835             (major_gte_15 && (is_synchronized || is_strict)))) {
3836           is_illegal = true;
3837         }
3838       }
3839       if (has_illegal_visibility(flags)) {
3840         is_illegal = true;
3841       }
3842     }
3843   }
3844 
3845   if (is_illegal) {
3846     ResourceMark rm(THREAD);
3847     Exceptions::fthrow(
3848       THREAD_AND_LOCATION,
3849       vmSymbolHandles::java_lang_ClassFormatError(),
3850       "Method %s in class %s has illegal modifiers: 0x%X",
3851       name->as_C_string(), _class_name->as_C_string(), flags);
3852     return;
3853   }
3854 }
3855 
3856 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
3857   assert(_need_verify, "only called when _need_verify is true");
3858   int i = 0;
3859   int count = length >> 2;
3860   for (int k=0; k<count; k++) {
3861     unsigned char b0 = buffer[i];
3862     unsigned char b1 = buffer[i+1];
3863     unsigned char b2 = buffer[i+2];
3864     unsigned char b3 = buffer[i+3];
3865     // For an unsigned char v,
3866     // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
3867     // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
3868     unsigned char res = b0 | b0 - 1 |
3869                         b1 | b1 - 1 |
3870                         b2 | b2 - 1 |
3871                         b3 | b3 - 1;
3872     if (res >= 128) break;
3873     i += 4;
3874   }
3875   for(; i < length; i++) {
3876     unsigned short c;
3877     // no embedded zeros
3878     guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
3879     if(buffer[i] < 128) {
3880       continue;
3881     }
3882     if ((i + 5) < length) { // see if it's legal supplementary character
3883       if (UTF8::is_supplementary_character(&buffer[i])) {
3884         c = UTF8::get_supplementary_character(&buffer[i]);
3885         i += 5;
3886         continue;
3887       }
3888     }
3889     switch (buffer[i] >> 4) {
3890       default: break;
3891       case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
3892         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3893       case 0xC: case 0xD:  // 110xxxxx  10xxxxxx
3894         c = (buffer[i] & 0x1F) << 6;
3895         i++;
3896         if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
3897           c += buffer[i] & 0x3F;
3898           if (_major_version <= 47 || c == 0 || c >= 0x80) {
3899             // for classes with major > 47, c must a null or a character in its shortest form
3900             break;
3901           }
3902         }
3903         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3904       case 0xE:  // 1110xxxx 10xxxxxx 10xxxxxx
3905         c = (buffer[i] & 0xF) << 12;
3906         i += 2;
3907         if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
3908           c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
3909           if (_major_version <= 47 || c >= 0x800) {
3910             // for classes with major > 47, c must be in its shortest form
3911             break;
3912           }
3913         }
3914         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
3915     }  // end of switch
3916   } // end of for
3917 }
3918 
3919 // Checks if name is a legal class name.
3920 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
3921   if (!_need_verify || _relax_verify) { return; }
3922 
3923   char buf[fixed_buffer_size];
3924   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3925   unsigned int length = name->utf8_length();
3926   bool legal = false;
3927 
3928   if (length > 0) {
3929     char* p;
3930     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
3931       p = skip_over_field_signature(bytes, false, length, CHECK);
3932       legal = (p != NULL) && ((p - bytes) == (int)length);
3933     } else if (_major_version < JAVA_1_5_VERSION) {
3934       if (bytes[0] != '<') {
3935         p = skip_over_field_name(bytes, true, length);
3936         legal = (p != NULL) && ((p - bytes) == (int)length);
3937       }
3938     } else {
3939       // 4900761: relax the constraints based on JSR202 spec
3940       // Class names may be drawn from the entire Unicode character set.
3941       // Identifiers between '/' must be unqualified names.
3942       // The utf8 string has been verified when parsing cpool entries.
3943       legal = verify_unqualified_name(bytes, length, LegalClass);
3944     }
3945   }
3946   if (!legal) {
3947     ResourceMark rm(THREAD);
3948     Exceptions::fthrow(
3949       THREAD_AND_LOCATION,
3950       vmSymbolHandles::java_lang_ClassFormatError(),
3951       "Illegal class name \"%s\" in class file %s", bytes,
3952       _class_name->as_C_string()
3953     );
3954     return;
3955   }
3956 }
3957 
3958 // Checks if name is a legal field name.
3959 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
3960   if (!_need_verify || _relax_verify) { return; }
3961 
3962   char buf[fixed_buffer_size];
3963   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3964   unsigned int length = name->utf8_length();
3965   bool legal = false;
3966 
3967   if (length > 0) {
3968     if (_major_version < JAVA_1_5_VERSION) {
3969       if (bytes[0] != '<') {
3970         char* p = skip_over_field_name(bytes, false, length);
3971         legal = (p != NULL) && ((p - bytes) == (int)length);
3972       }
3973     } else {
3974       // 4881221: relax the constraints based on JSR202 spec
3975       legal = verify_unqualified_name(bytes, length, LegalField);
3976     }
3977   }
3978 
3979   if (!legal) {
3980     ResourceMark rm(THREAD);
3981     Exceptions::fthrow(
3982       THREAD_AND_LOCATION,
3983       vmSymbolHandles::java_lang_ClassFormatError(),
3984       "Illegal field name \"%s\" in class %s", bytes,
3985       _class_name->as_C_string()
3986     );
3987     return;
3988   }
3989 }
3990 
3991 // Checks if name is a legal method name.
3992 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
3993   if (!_need_verify || _relax_verify) { return; }
3994 
3995   assert(!name.is_null(), "method name is null");
3996   char buf[fixed_buffer_size];
3997   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
3998   unsigned int length = name->utf8_length();
3999   bool legal = false;
4000 
4001   if (length > 0) {
4002     if (bytes[0] == '<') {
4003       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4004         legal = true;
4005       }
4006     } else if (_major_version < JAVA_1_5_VERSION) {
4007       char* p;
4008       p = skip_over_field_name(bytes, false, length);
4009       legal = (p != NULL) && ((p - bytes) == (int)length);
4010     } else {
4011       // 4881221: relax the constraints based on JSR202 spec
4012       legal = verify_unqualified_name(bytes, length, LegalMethod);
4013     }
4014   }
4015 
4016   if (!legal) {
4017     ResourceMark rm(THREAD);
4018     Exceptions::fthrow(
4019       THREAD_AND_LOCATION,
4020       vmSymbolHandles::java_lang_ClassFormatError(),
4021       "Illegal method name \"%s\" in class %s", bytes,
4022       _class_name->as_C_string()
4023     );
4024     return;
4025   }
4026 }
4027 
4028 
4029 // Checks if signature is a legal field signature.
4030 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4031   if (!_need_verify) { return; }
4032 
4033   char buf[fixed_buffer_size];
4034   char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4035   unsigned int length = signature->utf8_length();
4036   char* p = skip_over_field_signature(bytes, false, length, CHECK);
4037 
4038   if (p == NULL || (p - bytes) != (int)length) {
4039     ResourceMark rm(THREAD);
4040     Exceptions::fthrow(
4041       THREAD_AND_LOCATION,
4042       vmSymbolHandles::java_lang_ClassFormatError(),
4043       "Field \"%s\" in class %s has illegal signature \"%s\"",
4044       name->as_C_string(), _class_name->as_C_string(), bytes
4045     );
4046     return;
4047   }
4048 }
4049 
4050 // Checks if signature is a legal method signature.
4051 // Returns number of parameters
4052 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4053   if (!_need_verify) {
4054     // make sure caller's args_size will be less than 0 even for non-static
4055     // method so it will be recomputed in compute_size_of_parameters().
4056     return -2;
4057   }
4058 
4059   unsigned int args_size = 0;
4060   char buf[fixed_buffer_size];
4061   char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4062   unsigned int length = signature->utf8_length();
4063   char* nextp;
4064 
4065   // The first character must be a '('
4066   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4067     length--;
4068     // Skip over legal field signatures
4069     nextp = skip_over_field_signature(p, false, length, CHECK_0);
4070     while ((length > 0) && (nextp != NULL)) {
4071       args_size++;
4072       if (p[0] == 'J' || p[0] == 'D') {
4073         args_size++;
4074       }
4075       length -= nextp - p;
4076       p = nextp;
4077       nextp = skip_over_field_signature(p, false, length, CHECK_0);
4078     }
4079     // The first non-signature thing better be a ')'
4080     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4081       length--;
4082       if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4083         // All internal methods must return void
4084         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4085           return args_size;
4086         }
4087       } else {
4088         // Now we better just have a return value
4089         nextp = skip_over_field_signature(p, true, length, CHECK_0);
4090         if (nextp && ((int)length == (nextp - p))) {
4091           return args_size;
4092         }
4093       }
4094     }
4095   }
4096   // Report error
4097   ResourceMark rm(THREAD);
4098   Exceptions::fthrow(
4099     THREAD_AND_LOCATION,
4100     vmSymbolHandles::java_lang_ClassFormatError(),
4101     "Method \"%s\" in class %s has illegal signature \"%s\"",
4102     name->as_C_string(),  _class_name->as_C_string(), p
4103   );
4104   return 0;
4105 }
4106 
4107 
4108 // Unqualified names may not contain the characters '.', ';', or '/'.
4109 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
4110 // Note that method names may not be <init> or <clinit> in this method.
4111 // Because these names have been checked as special cases before calling this method
4112 // in verify_legal_method_name.
4113 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
4114   jchar ch;
4115 
4116   for (char* p = name; p != name + length; ) {
4117     ch = *p;
4118     if (ch < 128) {
4119       p++;
4120       if (ch == '.' || ch == ';') {
4121         return false;   // do not permit '.' or ';'
4122       }
4123       if (type != LegalClass && ch == '/') {
4124         return false;   // do not permit '/' unless it's class name
4125       }
4126       if (type == LegalMethod && (ch == '<' || ch == '>')) {
4127         return false;   // do not permit '<' or '>' in method names
4128       }
4129     } else {
4130       char* tmp_p = UTF8::next(p, &ch);
4131       p = tmp_p;
4132     }
4133   }
4134   return true;
4135 }
4136 
4137 
4138 // Take pointer to a string. Skip over the longest part of the string that could
4139 // be taken as a fieldname. Allow '/' if slash_ok is true.
4140 // Return a pointer to just past the fieldname.
4141 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4142 // being true, we saw consecutive slashes (meaning we were looking for a
4143 // qualified path but found something that was badly-formed).
4144 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4145   char* p;
4146   jchar ch;
4147   jboolean last_is_slash = false;
4148   jboolean not_first_ch = false;
4149 
4150   for (p = name; p != name + length; not_first_ch = true) {
4151     char* old_p = p;
4152     ch = *p;
4153     if (ch < 128) {
4154       p++;
4155       // quick check for ascii
4156       if ((ch >= 'a' && ch <= 'z') ||
4157           (ch >= 'A' && ch <= 'Z') ||
4158           (ch == '_' || ch == '$') ||
4159           (not_first_ch && ch >= '0' && ch <= '9')) {
4160         last_is_slash = false;
4161         continue;
4162       }
4163       if (slash_ok && ch == '/') {
4164         if (last_is_slash) {
4165           return NULL;  // Don't permit consecutive slashes
4166         }
4167         last_is_slash = true;
4168         continue;
4169       }
4170     } else {
4171       jint unicode_ch;
4172       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4173       p = tmp_p;
4174       last_is_slash = false;
4175       // Check if ch is Java identifier start or is Java identifier part
4176       // 4672820: call java.lang.Character methods directly without generating separate tables.
4177       EXCEPTION_MARK;
4178       instanceKlassHandle klass (THREAD, SystemDictionary::char_klass());
4179 
4180       // return value
4181       JavaValue result(T_BOOLEAN);
4182       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4183       JavaCallArguments args;
4184       args.push_int(unicode_ch);
4185 
4186       // public static boolean isJavaIdentifierStart(char ch);
4187       JavaCalls::call_static(&result,
4188                              klass,
4189                              vmSymbolHandles::isJavaIdentifierStart_name(),
4190                              vmSymbolHandles::int_bool_signature(),
4191                              &args,
4192                              THREAD);
4193 
4194       if (HAS_PENDING_EXCEPTION) {
4195         CLEAR_PENDING_EXCEPTION;
4196         return 0;
4197       }
4198       if (result.get_jboolean()) {
4199         continue;
4200       }
4201 
4202       if (not_first_ch) {
4203         // public static boolean isJavaIdentifierPart(char ch);
4204         JavaCalls::call_static(&result,
4205                                klass,
4206                                vmSymbolHandles::isJavaIdentifierPart_name(),
4207                                vmSymbolHandles::int_bool_signature(),
4208                                &args,
4209                                THREAD);
4210 
4211         if (HAS_PENDING_EXCEPTION) {
4212           CLEAR_PENDING_EXCEPTION;
4213           return 0;
4214         }
4215 
4216         if (result.get_jboolean()) {
4217           continue;
4218         }
4219       }
4220     }
4221     return (not_first_ch) ? old_p : NULL;
4222   }
4223   return (not_first_ch) ? p : NULL;
4224 }
4225 
4226 
4227 // Take pointer to a string. Skip over the longest part of the string that could
4228 // be taken as a field signature. Allow "void" if void_ok.
4229 // Return a pointer to just past the signature.
4230 // Return NULL if no legal signature is found.
4231 char* ClassFileParser::skip_over_field_signature(char* signature,
4232                                                  bool void_ok,
4233                                                  unsigned int length,
4234                                                  TRAPS) {
4235   unsigned int array_dim = 0;
4236   while (length > 0) {
4237     switch (signature[0]) {
4238       case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4239       case JVM_SIGNATURE_BOOLEAN:
4240       case JVM_SIGNATURE_BYTE:
4241       case JVM_SIGNATURE_CHAR:
4242       case JVM_SIGNATURE_SHORT:
4243       case JVM_SIGNATURE_INT:
4244       case JVM_SIGNATURE_FLOAT:
4245       case JVM_SIGNATURE_LONG:
4246       case JVM_SIGNATURE_DOUBLE:
4247         return signature + 1;
4248       case JVM_SIGNATURE_CLASS: {
4249         if (_major_version < JAVA_1_5_VERSION) {
4250           // Skip over the class name if one is there
4251           char* p = skip_over_field_name(signature + 1, true, --length);
4252 
4253           // The next character better be a semicolon
4254           if (p && (p - signature) > 1 && p[0] == ';') {
4255             return p + 1;
4256           }
4257         } else {
4258           // 4900761: For class version > 48, any unicode is allowed in class name.
4259           length--;
4260           signature++;
4261           while (length > 0 && signature[0] != ';') {
4262             if (signature[0] == '.') {
4263               classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4264             }
4265             length--;
4266             signature++;
4267           }
4268           if (signature[0] == ';') { return signature + 1; }
4269         }
4270 
4271         return NULL;
4272       }
4273       case JVM_SIGNATURE_ARRAY:
4274         array_dim++;
4275         if (array_dim > 255) {
4276           // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4277           classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4278         }
4279         // The rest of what's there better be a legal signature
4280         signature++;
4281         length--;
4282         void_ok = false;
4283         break;
4284 
4285       default:
4286         return NULL;
4287     }
4288   }
4289   return NULL;
4290 }