1 /*
   2  * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_classFileParser.cpp.incl"
  27 
  28 // We generally try to create the oops directly when parsing, rather than
  29 // allocating temporary data structures and copying the bytes twice. A
  30 // temporary area is only needed when parsing utf8 entries in the constant
  31 // pool and when parsing line number 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 // Used for backward compatibility reasons:
  51 // - to check NameAndType_info signatures more aggressively
  52 #define JAVA_7_VERSION                    51
  53 
  54 
  55 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) {
  56   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
  57   // this function (_current can be allocated in a register, with scalar
  58   // replacement of aggregates). The _current pointer is copied back to
  59   // stream() when this function returns. DON'T call another method within
  60   // this method that uses stream().
  61   ClassFileStream* cfs0 = stream();
  62   ClassFileStream cfs1 = *cfs0;
  63   ClassFileStream* cfs = &cfs1;
  64 #ifdef ASSERT
  65   assert(cfs->allocated_on_stack(),"should be local");
  66   u1* old_current = cfs0->current();
  67 #endif
  68 
  69   // Used for batching symbol allocations.
  70   const char* names[SymbolTable::symbol_alloc_batch_size];
  71   int lengths[SymbolTable::symbol_alloc_batch_size];
  72   int indices[SymbolTable::symbol_alloc_batch_size];
  73   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
  74   int names_count = 0;
  75 
  76   // parsing  Index 0 is unused
  77   for (int index = 1; index < length; index++) {
  78     // Each of the following case guarantees one more byte in the stream
  79     // for the following tag or the access_flags following constant pool,
  80     // so we don't need bounds-check for reading tag.
  81     u1 tag = cfs->get_u1_fast();
  82     switch (tag) {
  83       case JVM_CONSTANT_Class :
  84         {
  85           cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
  86           u2 name_index = cfs->get_u2_fast();
  87           cp->klass_index_at_put(index, name_index);
  88         }
  89         break;
  90       case JVM_CONSTANT_Fieldref :
  91         {
  92           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
  93           u2 class_index = cfs->get_u2_fast();
  94           u2 name_and_type_index = cfs->get_u2_fast();
  95           cp->field_at_put(index, class_index, name_and_type_index);
  96         }
  97         break;
  98       case JVM_CONSTANT_Methodref :
  99         {
 100           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 101           u2 class_index = cfs->get_u2_fast();
 102           u2 name_and_type_index = cfs->get_u2_fast();
 103           cp->method_at_put(index, class_index, name_and_type_index);
 104         }
 105         break;
 106       case JVM_CONSTANT_InterfaceMethodref :
 107         {
 108           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 109           u2 class_index = cfs->get_u2_fast();
 110           u2 name_and_type_index = cfs->get_u2_fast();
 111           cp->interface_method_at_put(index, class_index, name_and_type_index);
 112         }
 113         break;
 114       case JVM_CONSTANT_String :
 115         {
 116           cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 117           u2 string_index = cfs->get_u2_fast();
 118           cp->string_index_at_put(index, string_index);
 119         }
 120         break;
 121       case JVM_CONSTANT_MethodHandle :
 122       case JVM_CONSTANT_MethodType :
 123         if (!EnableMethodHandles ||
 124             _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 125           classfile_parse_error(
 126             (!EnableMethodHandles ?
 127              "This JVM does not support constant tag %u in class file %s" :
 128              "Class file version does not support constant tag %u in class file %s"),
 129             tag, CHECK);
 130         }
 131         if (tag == JVM_CONSTANT_MethodHandle) {
 132           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 133           u1 ref_kind = cfs->get_u1_fast();
 134           u2 method_index = cfs->get_u2_fast();
 135           cp->method_handle_index_at_put(index, ref_kind, method_index);
 136         } else if (tag == JVM_CONSTANT_MethodType) {
 137           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 138           u2 signature_index = cfs->get_u2_fast();
 139           cp->method_type_index_at_put(index, signature_index);
 140         } else {
 141           ShouldNotReachHere();
 142         }
 143         break;
 144       case JVM_CONSTANT_InvokeDynamic :
 145         {
 146           if (!EnableInvokeDynamic ||
 147               _major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 148             classfile_parse_error(
 149               (!EnableInvokeDynamic ?
 150                "This JVM does not support constant tag %u in class file %s" :
 151                "Class file version does not support constant tag %u in class file %s"),
 152               tag, CHECK);
 153           }
 154           cfs->guarantee_more(5, CHECK);  // bsm_index, name_and_type_index, tag/access_flags
 155           u2 bootstrap_method_index = cfs->get_u2_fast();
 156           u2 name_and_type_index = cfs->get_u2_fast();
 157           cp->invoke_dynamic_at_put(index, bootstrap_method_index, name_and_type_index);
 158         }
 159         break;
 160       case JVM_CONSTANT_Integer :
 161         {
 162           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 163           u4 bytes = cfs->get_u4_fast();
 164           cp->int_at_put(index, (jint) bytes);
 165         }
 166         break;
 167       case JVM_CONSTANT_Float :
 168         {
 169           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 170           u4 bytes = cfs->get_u4_fast();
 171           cp->float_at_put(index, *(jfloat*)&bytes);
 172         }
 173         break;
 174       case JVM_CONSTANT_Long :
 175         // A mangled type might cause you to overrun allocated memory
 176         guarantee_property(index+1 < length,
 177                            "Invalid constant pool entry %u in class file %s",
 178                            index, CHECK);
 179         {
 180           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 181           u8 bytes = cfs->get_u8_fast();
 182           cp->long_at_put(index, bytes);
 183         }
 184         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 185         break;
 186       case JVM_CONSTANT_Double :
 187         // A mangled type might cause you to overrun allocated memory
 188         guarantee_property(index+1 < length,
 189                            "Invalid constant pool entry %u in class file %s",
 190                            index, CHECK);
 191         {
 192           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 193           u8 bytes = cfs->get_u8_fast();
 194           cp->double_at_put(index, *(jdouble*)&bytes);
 195         }
 196         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 197         break;
 198       case JVM_CONSTANT_NameAndType :
 199         {
 200           cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 201           u2 name_index = cfs->get_u2_fast();
 202           u2 signature_index = cfs->get_u2_fast();
 203           cp->name_and_type_at_put(index, name_index, signature_index);
 204         }
 205         break;
 206       case JVM_CONSTANT_Utf8 :
 207         {
 208           cfs->guarantee_more(2, CHECK);  // utf8_length
 209           u2  utf8_length = cfs->get_u2_fast();
 210           u1* utf8_buffer = cfs->get_u1_buffer();
 211           assert(utf8_buffer != NULL, "null utf8 buffer");
 212           // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 213           cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 214           cfs->skip_u1_fast(utf8_length);
 215 
 216           // Before storing the symbol, make sure it's legal
 217           if (_need_verify) {
 218             verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
 219           }
 220 
 221           if (AnonymousClasses && has_cp_patch_at(index)) {
 222             Handle patch = clear_cp_patch_at(index);
 223             guarantee_property(java_lang_String::is_instance(patch()),
 224                                "Illegal utf8 patch at %d in class file %s",
 225                                index, CHECK);
 226             char* str = java_lang_String::as_utf8_string(patch());
 227             // (could use java_lang_String::as_symbol instead, but might as well batch them)
 228             utf8_buffer = (u1*) str;
 229             utf8_length = (int) strlen(str);
 230           }
 231 
 232           unsigned int hash;
 233           symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
 234           if (result == NULL) {
 235             names[names_count] = (char*)utf8_buffer;
 236             lengths[names_count] = utf8_length;
 237             indices[names_count] = index;
 238             hashValues[names_count++] = hash;
 239             if (names_count == SymbolTable::symbol_alloc_batch_size) {
 240               oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
 241               names_count = 0;
 242             }
 243           } else {
 244             cp->symbol_at_put(index, result);
 245           }
 246         }
 247         break;
 248       default:
 249         classfile_parse_error(
 250           "Unknown constant tag %u in class file %s", tag, CHECK);
 251         break;
 252     }
 253   }
 254 
 255   // Allocate the remaining symbols
 256   if (names_count > 0) {
 257     oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK);
 258   }
 259 
 260   // Copy _current pointer of local copy back to stream().
 261 #ifdef ASSERT
 262   assert(cfs0->current() == old_current, "non-exclusive use of stream()");
 263 #endif
 264   cfs0->set_current(cfs1.current());
 265 }
 266 
 267 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
 268 
 269 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
 270   ClassFileStream* cfs = stream();
 271   constantPoolHandle nullHandle;
 272 
 273   cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
 274   u2 length = cfs->get_u2_fast();
 275   guarantee_property(
 276     length >= 1, "Illegal constant pool size %u in class file %s",
 277     length, CHECK_(nullHandle));
 278   constantPoolOop constant_pool =
 279                       oopFactory::new_constantPool(length,
 280                                                    methodOopDesc::IsSafeConc,
 281                                                    CHECK_(nullHandle));
 282   constantPoolHandle cp (THREAD, constant_pool);
 283 
 284   cp->set_partially_loaded();    // Enables heap verify to work on partial constantPoolOops
 285 
 286   // parsing constant pool entries
 287   parse_constant_pool_entries(cp, length, CHECK_(nullHandle));
 288 
 289   int index = 1;  // declared outside of loops for portability
 290 
 291   // first verification pass - validate cross references and fixup class and string constants
 292   for (index = 1; index < length; index++) {          // Index 0 is unused
 293     switch (cp->tag_at(index).value()) {
 294       case JVM_CONSTANT_Class :
 295         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 296         break;
 297       case JVM_CONSTANT_Fieldref :
 298         // fall through
 299       case JVM_CONSTANT_Methodref :
 300         // fall through
 301       case JVM_CONSTANT_InterfaceMethodref : {
 302         if (!_need_verify) break;
 303         int klass_ref_index = cp->klass_ref_index_at(index);
 304         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 305         check_property(valid_cp_range(klass_ref_index, length) &&
 306                        is_klass_reference(cp, klass_ref_index),
 307                        "Invalid constant pool index %u in class file %s",
 308                        klass_ref_index,
 309                        CHECK_(nullHandle));
 310         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 311                        cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 312                        "Invalid constant pool index %u in class file %s",
 313                        name_and_type_ref_index,
 314                        CHECK_(nullHandle));
 315         break;
 316       }
 317       case JVM_CONSTANT_String :
 318         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 319         break;
 320       case JVM_CONSTANT_Integer :
 321         break;
 322       case JVM_CONSTANT_Float :
 323         break;
 324       case JVM_CONSTANT_Long :
 325       case JVM_CONSTANT_Double :
 326         index++;
 327         check_property(
 328           (index < length && cp->tag_at(index).is_invalid()),
 329           "Improper constant pool long/double index %u in class file %s",
 330           index, CHECK_(nullHandle));
 331         break;
 332       case JVM_CONSTANT_NameAndType : {
 333         if (!_need_verify) break;
 334         int name_ref_index = cp->name_ref_index_at(index);
 335         int signature_ref_index = cp->signature_ref_index_at(index);
 336         check_property(
 337           valid_cp_range(name_ref_index, length) &&
 338             cp->tag_at(name_ref_index).is_utf8(),
 339           "Invalid constant pool index %u in class file %s",
 340           name_ref_index, CHECK_(nullHandle));
 341         check_property(
 342           valid_cp_range(signature_ref_index, length) &&
 343             cp->tag_at(signature_ref_index).is_utf8(),
 344           "Invalid constant pool index %u in class file %s",
 345           signature_ref_index, CHECK_(nullHandle));
 346         break;
 347       }
 348       case JVM_CONSTANT_Utf8 :
 349         break;
 350       case JVM_CONSTANT_UnresolvedClass :         // fall-through
 351       case JVM_CONSTANT_UnresolvedClassInError:
 352         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 353         break;
 354       case JVM_CONSTANT_ClassIndex :
 355         {
 356           int class_index = cp->klass_index_at(index);
 357           check_property(
 358             valid_cp_range(class_index, length) &&
 359               cp->tag_at(class_index).is_utf8(),
 360             "Invalid constant pool index %u in class file %s",
 361             class_index, CHECK_(nullHandle));
 362           cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
 363         }
 364         break;
 365       case JVM_CONSTANT_UnresolvedString :
 366         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 367         break;
 368       case JVM_CONSTANT_StringIndex :
 369         {
 370           int string_index = cp->string_index_at(index);
 371           check_property(
 372             valid_cp_range(string_index, length) &&
 373               cp->tag_at(string_index).is_utf8(),
 374             "Invalid constant pool index %u in class file %s",
 375             string_index, CHECK_(nullHandle));
 376           symbolOop sym = cp->symbol_at(string_index);
 377           cp->unresolved_string_at_put(index, sym);
 378         }
 379         break;
 380       case JVM_CONSTANT_MethodHandle :
 381         {
 382           int ref_index = cp->method_handle_index_at(index);
 383           check_property(
 384             valid_cp_range(ref_index, length) &&
 385                 EnableMethodHandles,
 386               "Invalid constant pool index %u in class file %s",
 387               ref_index, CHECK_(nullHandle));
 388           constantTag tag = cp->tag_at(ref_index);
 389           int ref_kind  = cp->method_handle_ref_kind_at(index);
 390           switch (ref_kind) {
 391           case JVM_REF_getField:
 392           case JVM_REF_getStatic:
 393           case JVM_REF_putField:
 394           case JVM_REF_putStatic:
 395             check_property(
 396               tag.is_field(),
 397               "Invalid constant pool index %u in class file %s (not a field)",
 398               ref_index, CHECK_(nullHandle));
 399             break;
 400           case JVM_REF_invokeVirtual:
 401           case JVM_REF_invokeStatic:
 402           case JVM_REF_invokeSpecial:
 403           case JVM_REF_newInvokeSpecial:
 404             check_property(
 405               tag.is_method(),
 406               "Invalid constant pool index %u in class file %s (not a method)",
 407               ref_index, CHECK_(nullHandle));
 408             break;
 409           case JVM_REF_invokeInterface:
 410             check_property(
 411               tag.is_interface_method(),
 412               "Invalid constant pool index %u in class file %s (not an interface method)",
 413               ref_index, CHECK_(nullHandle));
 414             break;
 415           default:
 416             classfile_parse_error(
 417               "Bad method handle kind at constant pool index %u in class file %s",
 418               index, CHECK_(nullHandle));
 419           }
 420           // Keep the ref_index unchanged.  It will be indirected at link-time.
 421         }
 422         break;
 423       case JVM_CONSTANT_MethodType :
 424         {
 425           int ref_index = cp->method_type_index_at(index);
 426           check_property(
 427             valid_cp_range(ref_index, length) &&
 428                 cp->tag_at(ref_index).is_utf8() &&
 429                 EnableMethodHandles,
 430               "Invalid constant pool index %u in class file %s",
 431               ref_index, CHECK_(nullHandle));
 432         }
 433         break;
 434       case JVM_CONSTANT_InvokeDynamic :
 435         {
 436           int bootstrap_method_ref_index = cp->invoke_dynamic_bootstrap_method_ref_index_at(index);
 437           int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
 438           check_property((bootstrap_method_ref_index == 0 && AllowTransitionalJSR292)
 439                          ||
 440                          (valid_cp_range(bootstrap_method_ref_index, length) &&
 441                           cp->tag_at(bootstrap_method_ref_index).is_method_handle()),
 442                          "Invalid constant pool index %u in class file %s",
 443                          bootstrap_method_ref_index,
 444                          CHECK_(nullHandle));
 445           check_property(valid_cp_range(name_and_type_ref_index, length) &&
 446                          cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 447                          "Invalid constant pool index %u in class file %s",
 448                          name_and_type_ref_index,
 449                          CHECK_(nullHandle));
 450           break;
 451         }
 452       default:
 453         fatal(err_msg("bad constant pool tag value %u",
 454                       cp->tag_at(index).value()));
 455         ShouldNotReachHere();
 456         break;
 457     } // end of switch
 458   } // end of for
 459 
 460   if (_cp_patches != NULL) {
 461     // need to treat this_class specially...
 462     assert(AnonymousClasses, "");
 463     int this_class_index;
 464     {
 465       cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
 466       u1* mark = cfs->current();
 467       u2 flags         = cfs->get_u2_fast();
 468       this_class_index = cfs->get_u2_fast();
 469       cfs->set_current(mark);  // revert to mark
 470     }
 471 
 472     for (index = 1; index < length; index++) {          // Index 0 is unused
 473       if (has_cp_patch_at(index)) {
 474         guarantee_property(index != this_class_index,
 475                            "Illegal constant pool patch to self at %d in class file %s",
 476                            index, CHECK_(nullHandle));
 477         patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
 478       }
 479     }
 480     // Ensure that all the patches have been used.
 481     for (index = 0; index < _cp_patches->length(); index++) {
 482       guarantee_property(!has_cp_patch_at(index),
 483                          "Unused constant pool patch at %d in class file %s",
 484                          index, CHECK_(nullHandle));
 485     }
 486   }
 487 
 488   if (!_need_verify) {
 489     return cp;
 490   }
 491 
 492   // second verification pass - checks the strings are of the right format.
 493   // but not yet to the other entries
 494   for (index = 1; index < length; index++) {
 495     jbyte tag = cp->tag_at(index).value();
 496     switch (tag) {
 497       case JVM_CONSTANT_UnresolvedClass: {
 498         symbolHandle class_name(THREAD, cp->unresolved_klass_at(index));
 499         // check the name, even if _cp_patches will overwrite it
 500         verify_legal_class_name(class_name, CHECK_(nullHandle));
 501         break;
 502       }
 503       case JVM_CONSTANT_NameAndType: {
 504         if (_need_verify && _major_version >= JAVA_7_VERSION) {
 505           int sig_index = cp->signature_ref_index_at(index);
 506           int name_index = cp->name_ref_index_at(index);
 507           symbolHandle name(THREAD, cp->symbol_at(name_index));
 508           symbolHandle sig(THREAD, cp->symbol_at(sig_index));
 509           if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
 510             verify_legal_method_signature(name, sig, CHECK_(nullHandle));
 511           } else {
 512             verify_legal_field_signature(name, sig, CHECK_(nullHandle));
 513           }
 514         }
 515         break;
 516       }
 517       case JVM_CONSTANT_Fieldref:
 518       case JVM_CONSTANT_Methodref:
 519       case JVM_CONSTANT_InterfaceMethodref: {
 520         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 521         // already verified to be utf8
 522         int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 523         // already verified to be utf8
 524         int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
 525         symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
 526         symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index));
 527         if (tag == JVM_CONSTANT_Fieldref) {
 528           verify_legal_field_name(name, CHECK_(nullHandle));
 529           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 530             // Signature is verified above, when iterating NameAndType_info.
 531             // Need only to be sure it's the right type.
 532             if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
 533               throwIllegalSignature(
 534                   "Field", name, signature, CHECK_(nullHandle));
 535             }
 536           } else {
 537             verify_legal_field_signature(name, signature, CHECK_(nullHandle));
 538           }
 539         } else {
 540           verify_legal_method_name(name, CHECK_(nullHandle));
 541           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 542             // Signature is verified above, when iterating NameAndType_info.
 543             // Need only to be sure it's the right type.
 544             if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
 545               throwIllegalSignature(
 546                   "Method", name, signature, CHECK_(nullHandle));
 547             }
 548           } else {
 549             verify_legal_method_signature(name, signature, CHECK_(nullHandle));
 550           }
 551           if (tag == JVM_CONSTANT_Methodref) {
 552             // 4509014: If a class method name begins with '<', it must be "<init>".
 553             assert(!name.is_null(), "method name in constant pool is null");
 554             unsigned int name_len = name->utf8_length();
 555             assert(name_len > 0, "bad method name");  // already verified as legal name
 556             if (name->byte_at(0) == '<') {
 557               if (name() != vmSymbols::object_initializer_name()) {
 558                 classfile_parse_error(
 559                   "Bad method name at constant pool index %u in class file %s",
 560                   name_ref_index, CHECK_(nullHandle));
 561               }
 562             }
 563           }
 564         }
 565         break;
 566       }
 567       case JVM_CONSTANT_MethodHandle: {
 568         int ref_index = cp->method_handle_index_at(index);
 569         int ref_kind  = cp->method_handle_ref_kind_at(index);
 570         switch (ref_kind) {
 571         case JVM_REF_invokeVirtual:
 572         case JVM_REF_invokeStatic:
 573         case JVM_REF_invokeSpecial:
 574         case JVM_REF_newInvokeSpecial:
 575           {
 576             int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
 577             int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 578             symbolHandle name(THREAD, cp->symbol_at(name_ref_index));
 579             if (ref_kind == JVM_REF_newInvokeSpecial) {
 580               if (name() != vmSymbols::object_initializer_name()) {
 581                 classfile_parse_error(
 582                   "Bad constructor name at constant pool index %u in class file %s",
 583                   name_ref_index, CHECK_(nullHandle));
 584               }
 585             } else {
 586               if (name() == vmSymbols::object_initializer_name()) {
 587                 classfile_parse_error(
 588                   "Bad method name at constant pool index %u in class file %s",
 589                   name_ref_index, CHECK_(nullHandle));
 590               }
 591             }
 592           }
 593           break;
 594           // Other ref_kinds are already fully checked in previous pass.
 595         }
 596         break;
 597       }
 598       case JVM_CONSTANT_MethodType: {
 599         symbolHandle no_name = vmSymbolHandles::type_name(); // place holder
 600         symbolHandle signature(THREAD, cp->method_type_signature_at(index));
 601         verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
 602         break;
 603       }
 604     }  // end of switch
 605   }  // end of for
 606 
 607   return cp;
 608 }
 609 
 610 
 611 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
 612   assert(AnonymousClasses, "");
 613   BasicType patch_type = T_VOID;
 614   switch (cp->tag_at(index).value()) {
 615 
 616   case JVM_CONSTANT_UnresolvedClass :
 617     // Patching a class means pre-resolving it.
 618     // The name in the constant pool is ignored.
 619     if (java_lang_Class::is_instance(patch())) {
 620       guarantee_property(!java_lang_Class::is_primitive(patch()),
 621                          "Illegal class patch at %d in class file %s",
 622                          index, CHECK);
 623       cp->klass_at_put(index, java_lang_Class::as_klassOop(patch()));
 624     } else {
 625       guarantee_property(java_lang_String::is_instance(patch()),
 626                          "Illegal class patch at %d in class file %s",
 627                          index, CHECK);
 628       symbolHandle name = java_lang_String::as_symbol(patch(), CHECK);
 629       cp->unresolved_klass_at_put(index, name());
 630     }
 631     break;
 632 
 633   case JVM_CONSTANT_UnresolvedString :
 634     // Patching a string means pre-resolving it.
 635     // The spelling in the constant pool is ignored.
 636     // The constant reference may be any object whatever.
 637     // If it is not a real interned string, the constant is referred
 638     // to as a "pseudo-string", and must be presented to the CP
 639     // explicitly, because it may require scavenging.
 640     cp->pseudo_string_at_put(index, patch());
 641     break;
 642 
 643   case JVM_CONSTANT_Integer : patch_type = T_INT;    goto patch_prim;
 644   case JVM_CONSTANT_Float :   patch_type = T_FLOAT;  goto patch_prim;
 645   case JVM_CONSTANT_Long :    patch_type = T_LONG;   goto patch_prim;
 646   case JVM_CONSTANT_Double :  patch_type = T_DOUBLE; goto patch_prim;
 647   patch_prim:
 648     {
 649       jvalue value;
 650       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 651       guarantee_property(value_type == patch_type,
 652                          "Illegal primitive patch at %d in class file %s",
 653                          index, CHECK);
 654       switch (value_type) {
 655       case T_INT:    cp->int_at_put(index,   value.i); break;
 656       case T_FLOAT:  cp->float_at_put(index, value.f); break;
 657       case T_LONG:   cp->long_at_put(index,  value.j); break;
 658       case T_DOUBLE: cp->double_at_put(index, value.d); break;
 659       default:       assert(false, "");
 660       }
 661     }
 662     break;
 663 
 664   default:
 665     // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 666     guarantee_property(!has_cp_patch_at(index),
 667                        "Illegal unexpected patch at %d in class file %s",
 668                        index, CHECK);
 669     return;
 670   }
 671 
 672   // On fall-through, mark the patch as used.
 673   clear_cp_patch_at(index);
 674 }
 675 
 676 
 677 
 678 class NameSigHash: public ResourceObj {
 679  public:
 680   symbolOop     _name;       // name
 681   symbolOop     _sig;        // signature
 682   NameSigHash*  _next;       // Next entry in hash table
 683 };
 684 
 685 
 686 #define HASH_ROW_SIZE 256
 687 
 688 unsigned int hash(symbolOop name, symbolOop sig) {
 689   unsigned int raw_hash = 0;
 690   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 691   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 692 
 693   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 694 }
 695 
 696 
 697 void initialize_hashtable(NameSigHash** table) {
 698   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 699 }
 700 
 701 // Return false if the name/sig combination is found in table.
 702 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 703 // The old format checker uses heap sort to find duplicates.
 704 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 705 // of table since we don't expect symbolOop's to move.
 706 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) {
 707   assert(name != NULL, "name in constant pool is NULL");
 708 
 709   // First lookup for duplicates
 710   int index = hash(name, sig);
 711   NameSigHash* entry = table[index];
 712   while (entry != NULL) {
 713     if (entry->_name == name && entry->_sig == sig) {
 714       return false;
 715     }
 716     entry = entry->_next;
 717   }
 718 
 719   // No duplicate is found, allocate a new entry and fill it.
 720   entry = new NameSigHash();
 721   entry->_name = name;
 722   entry->_sig = sig;
 723 
 724   // Insert into hash table
 725   entry->_next = table[index];
 726   table[index] = entry;
 727 
 728   return true;
 729 }
 730 
 731 
 732 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp,
 733                                                  int length,
 734                                                  Handle class_loader,
 735                                                  Handle protection_domain,
 736                                                  symbolHandle class_name,
 737                                                  TRAPS) {
 738   ClassFileStream* cfs = stream();
 739   assert(length > 0, "only called for length>0");
 740   objArrayHandle nullHandle;
 741   objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
 742   objArrayHandle interfaces (THREAD, interface_oop);
 743 
 744   int index;
 745   for (index = 0; index < length; index++) {
 746     u2 interface_index = cfs->get_u2(CHECK_(nullHandle));
 747     KlassHandle interf;
 748     check_property(
 749       valid_cp_range(interface_index, cp->length()) &&
 750       is_klass_reference(cp, interface_index),
 751       "Interface name has bad constant pool index %u in class file %s",
 752       interface_index, CHECK_(nullHandle));
 753     if (cp->tag_at(interface_index).is_klass()) {
 754       interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
 755     } else {
 756       symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index));
 757 
 758       // Don't need to check legal name because it's checked when parsing constant pool.
 759       // But need to make sure it's not an array type.
 760       guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 761                          "Bad interface name in class file %s", CHECK_(nullHandle));
 762 
 763       // Call resolve_super so classcircularity is checked
 764       klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
 765                     unresolved_klass, class_loader, protection_domain,
 766                     false, CHECK_(nullHandle));
 767       interf = KlassHandle(THREAD, k);
 768 
 769       if (LinkWellKnownClasses)  // my super type is well known to me
 770         cp->klass_at_put(interface_index, interf()); // eagerly resolve
 771     }
 772 
 773     if (!Klass::cast(interf())->is_interface()) {
 774       THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle);
 775     }
 776     interfaces->obj_at_put(index, interf());
 777   }
 778 
 779   if (!_need_verify || length <= 1) {
 780     return interfaces;
 781   }
 782 
 783   // Check if there's any duplicates in interfaces
 784   ResourceMark rm(THREAD);
 785   NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
 786     THREAD, NameSigHash*, HASH_ROW_SIZE);
 787   initialize_hashtable(interface_names);
 788   bool dup = false;
 789   {
 790     debug_only(No_Safepoint_Verifier nsv;)
 791     for (index = 0; index < length; index++) {
 792       klassOop k = (klassOop)interfaces->obj_at(index);
 793       symbolOop name = instanceKlass::cast(k)->name();
 794       // If no duplicates, add (name, NULL) in hashtable interface_names.
 795       if (!put_after_lookup(name, NULL, interface_names)) {
 796         dup = true;
 797         break;
 798       }
 799     }
 800   }
 801   if (dup) {
 802     classfile_parse_error("Duplicate interface name in class file %s",
 803                           CHECK_(nullHandle));
 804   }
 805 
 806   return interfaces;
 807 }
 808 
 809 
 810 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) {
 811   // Make sure the constant pool entry is of a type appropriate to this field
 812   guarantee_property(
 813     (constantvalue_index > 0 &&
 814       constantvalue_index < cp->length()),
 815     "Bad initial value index %u in ConstantValue attribute in class file %s",
 816     constantvalue_index, CHECK);
 817   constantTag value_type = cp->tag_at(constantvalue_index);
 818   switch ( cp->basic_type_for_signature_at(signature_index) ) {
 819     case T_LONG:
 820       guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
 821       break;
 822     case T_FLOAT:
 823       guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
 824       break;
 825     case T_DOUBLE:
 826       guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
 827       break;
 828     case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
 829       guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
 830       break;
 831     case T_OBJECT:
 832       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 833                          && (value_type.is_string() || value_type.is_unresolved_string())),
 834                          "Bad string initial value in class file %s", CHECK);
 835       break;
 836     default:
 837       classfile_parse_error(
 838         "Unable to set initial value %u in class file %s",
 839         constantvalue_index, CHECK);
 840   }
 841 }
 842 
 843 
 844 // Parse attributes for a field.
 845 void ClassFileParser::parse_field_attributes(constantPoolHandle cp,
 846                                              u2 attributes_count,
 847                                              bool is_static, u2 signature_index,
 848                                              u2* constantvalue_index_addr,
 849                                              bool* is_synthetic_addr,
 850                                              u2* generic_signature_index_addr,
 851                                              typeArrayHandle* field_annotations,
 852                                              TRAPS) {
 853   ClassFileStream* cfs = stream();
 854   assert(attributes_count > 0, "length should be greater than 0");
 855   u2 constantvalue_index = 0;
 856   u2 generic_signature_index = 0;
 857   bool is_synthetic = false;
 858   u1* runtime_visible_annotations = NULL;
 859   int runtime_visible_annotations_length = 0;
 860   u1* runtime_invisible_annotations = NULL;
 861   int runtime_invisible_annotations_length = 0;
 862   while (attributes_count--) {
 863     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
 864     u2 attribute_name_index = cfs->get_u2_fast();
 865     u4 attribute_length = cfs->get_u4_fast();
 866     check_property(valid_cp_range(attribute_name_index, cp->length()) &&
 867                    cp->tag_at(attribute_name_index).is_utf8(),
 868                    "Invalid field attribute index %u in class file %s",
 869                    attribute_name_index,
 870                    CHECK);
 871     symbolOop attribute_name = cp->symbol_at(attribute_name_index);
 872     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
 873       // ignore if non-static
 874       if (constantvalue_index != 0) {
 875         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
 876       }
 877       check_property(
 878         attribute_length == 2,
 879         "Invalid ConstantValue field attribute length %u in class file %s",
 880         attribute_length, CHECK);
 881       constantvalue_index = cfs->get_u2(CHECK);
 882       if (_need_verify) {
 883         verify_constantvalue(constantvalue_index, signature_index, cp, CHECK);
 884       }
 885     } else if (attribute_name == vmSymbols::tag_synthetic()) {
 886       if (attribute_length != 0) {
 887         classfile_parse_error(
 888           "Invalid Synthetic field attribute length %u in class file %s",
 889           attribute_length, CHECK);
 890       }
 891       is_synthetic = true;
 892     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
 893       if (attribute_length != 0) {
 894         classfile_parse_error(
 895           "Invalid Deprecated field attribute length %u in class file %s",
 896           attribute_length, CHECK);
 897       }
 898     } else if (_major_version >= JAVA_1_5_VERSION) {
 899       if (attribute_name == vmSymbols::tag_signature()) {
 900         if (attribute_length != 2) {
 901           classfile_parse_error(
 902             "Wrong size %u for field's Signature attribute in class file %s",
 903             attribute_length, CHECK);
 904         }
 905         generic_signature_index = cfs->get_u2(CHECK);
 906       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
 907         runtime_visible_annotations_length = attribute_length;
 908         runtime_visible_annotations = cfs->get_u1_buffer();
 909         assert(runtime_visible_annotations != NULL, "null visible annotations");
 910         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
 911       } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
 912         runtime_invisible_annotations_length = attribute_length;
 913         runtime_invisible_annotations = cfs->get_u1_buffer();
 914         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
 915         cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
 916       } else {
 917         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 918       }
 919     } else {
 920       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 921     }
 922   }
 923 
 924   *constantvalue_index_addr = constantvalue_index;
 925   *is_synthetic_addr = is_synthetic;
 926   *generic_signature_index_addr = generic_signature_index;
 927   *field_annotations = assemble_annotations(runtime_visible_annotations,
 928                                             runtime_visible_annotations_length,
 929                                             runtime_invisible_annotations,
 930                                             runtime_invisible_annotations_length,
 931                                             CHECK);
 932   return;
 933 }
 934 
 935 
 936 // Field allocation types. Used for computing field offsets.
 937 
 938 enum FieldAllocationType {
 939   STATIC_OOP,           // Oops
 940   STATIC_BYTE,          // Boolean, Byte, char
 941   STATIC_SHORT,         // shorts
 942   STATIC_WORD,          // ints
 943   STATIC_DOUBLE,        // long or double
 944   STATIC_ALIGNED_DOUBLE,// aligned long or double
 945   NONSTATIC_OOP,
 946   NONSTATIC_BYTE,
 947   NONSTATIC_SHORT,
 948   NONSTATIC_WORD,
 949   NONSTATIC_DOUBLE,
 950   NONSTATIC_ALIGNED_DOUBLE
 951 };
 952 
 953 
 954 struct FieldAllocationCount {
 955   unsigned int static_oop_count;
 956   unsigned int static_byte_count;
 957   unsigned int static_short_count;
 958   unsigned int static_word_count;
 959   unsigned int static_double_count;
 960   unsigned int nonstatic_oop_count;
 961   unsigned int nonstatic_byte_count;
 962   unsigned int nonstatic_short_count;
 963   unsigned int nonstatic_word_count;
 964   unsigned int nonstatic_double_count;
 965 };
 966 
 967 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface,
 968                                               struct FieldAllocationCount *fac,
 969                                               objArrayHandle* fields_annotations, TRAPS) {
 970   ClassFileStream* cfs = stream();
 971   typeArrayHandle nullHandle;
 972   cfs->guarantee_more(2, CHECK_(nullHandle));  // length
 973   u2 length = cfs->get_u2_fast();
 974   // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index]
 975   typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle));
 976   typeArrayHandle fields(THREAD, new_fields);
 977 
 978   int index = 0;
 979   typeArrayHandle field_annotations;
 980   for (int n = 0; n < length; n++) {
 981     cfs->guarantee_more(8, CHECK_(nullHandle));  // access_flags, name_index, descriptor_index, attributes_count
 982 
 983     AccessFlags access_flags;
 984     jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
 985     verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle));
 986     access_flags.set_flags(flags);
 987 
 988     u2 name_index = cfs->get_u2_fast();
 989     int cp_size = cp->length();
 990     check_property(
 991       valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(),
 992       "Invalid constant pool index %u for field name in class file %s",
 993       name_index, CHECK_(nullHandle));
 994     symbolHandle name(THREAD, cp->symbol_at(name_index));
 995     verify_legal_field_name(name, CHECK_(nullHandle));
 996 
 997     u2 signature_index = cfs->get_u2_fast();
 998     check_property(
 999       valid_cp_range(signature_index, cp_size) &&
1000         cp->tag_at(signature_index).is_utf8(),
1001       "Invalid constant pool index %u for field signature in class file %s",
1002       signature_index, CHECK_(nullHandle));
1003     symbolHandle sig(THREAD, cp->symbol_at(signature_index));
1004     verify_legal_field_signature(name, sig, CHECK_(nullHandle));
1005 
1006     u2 constantvalue_index = 0;
1007     bool is_synthetic = false;
1008     u2 generic_signature_index = 0;
1009     bool is_static = access_flags.is_static();
1010 
1011     u2 attributes_count = cfs->get_u2_fast();
1012     if (attributes_count > 0) {
1013       parse_field_attributes(cp, attributes_count, is_static, signature_index,
1014                              &constantvalue_index, &is_synthetic,
1015                              &generic_signature_index, &field_annotations,
1016                              CHECK_(nullHandle));
1017       if (field_annotations.not_null()) {
1018         if (fields_annotations->is_null()) {
1019           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
1020           *fields_annotations = objArrayHandle(THREAD, md);
1021         }
1022         (*fields_annotations)->obj_at_put(n, field_annotations());
1023       }
1024       if (is_synthetic) {
1025         access_flags.set_is_synthetic();
1026       }
1027     }
1028 
1029     fields->short_at_put(index++, access_flags.as_short());
1030     fields->short_at_put(index++, name_index);
1031     fields->short_at_put(index++, signature_index);
1032     fields->short_at_put(index++, constantvalue_index);
1033 
1034     // Remember how many oops we encountered and compute allocation type
1035     BasicType type = cp->basic_type_for_signature_at(signature_index);
1036     FieldAllocationType atype;
1037     if ( is_static ) {
1038       switch ( type ) {
1039         case  T_BOOLEAN:
1040         case  T_BYTE:
1041           fac->static_byte_count++;
1042           atype = STATIC_BYTE;
1043           break;
1044         case  T_LONG:
1045         case  T_DOUBLE:
1046           if (Universe::field_type_should_be_aligned(type)) {
1047             atype = STATIC_ALIGNED_DOUBLE;
1048           } else {
1049             atype = STATIC_DOUBLE;
1050           }
1051           fac->static_double_count++;
1052           break;
1053         case  T_CHAR:
1054         case  T_SHORT:
1055           fac->static_short_count++;
1056           atype = STATIC_SHORT;
1057           break;
1058         case  T_FLOAT:
1059         case  T_INT:
1060           fac->static_word_count++;
1061           atype = STATIC_WORD;
1062           break;
1063         case  T_ARRAY:
1064         case  T_OBJECT:
1065           fac->static_oop_count++;
1066           atype = STATIC_OOP;
1067           break;
1068         case  T_ADDRESS:
1069         case  T_VOID:
1070         default:
1071           assert(0, "bad field type");
1072       }
1073     } else {
1074       switch ( type ) {
1075         case  T_BOOLEAN:
1076         case  T_BYTE:
1077           fac->nonstatic_byte_count++;
1078           atype = NONSTATIC_BYTE;
1079           break;
1080         case  T_LONG:
1081         case  T_DOUBLE:
1082           if (Universe::field_type_should_be_aligned(type)) {
1083             atype = NONSTATIC_ALIGNED_DOUBLE;
1084           } else {
1085             atype = NONSTATIC_DOUBLE;
1086           }
1087           fac->nonstatic_double_count++;
1088           break;
1089         case  T_CHAR:
1090         case  T_SHORT:
1091           fac->nonstatic_short_count++;
1092           atype = NONSTATIC_SHORT;
1093           break;
1094         case  T_FLOAT:
1095         case  T_INT:
1096           fac->nonstatic_word_count++;
1097           atype = NONSTATIC_WORD;
1098           break;
1099         case  T_ARRAY:
1100         case  T_OBJECT:
1101           fac->nonstatic_oop_count++;
1102           atype = NONSTATIC_OOP;
1103           break;
1104         case  T_ADDRESS:
1105         case  T_VOID:
1106         default:
1107           assert(0, "bad field type");
1108       }
1109     }
1110 
1111     // The correct offset is computed later (all oop fields will be located together)
1112     // We temporarily store the allocation type in the offset field
1113     fields->short_at_put(index++, atype);
1114     fields->short_at_put(index++, 0);  // Clear out high word of byte offset
1115     fields->short_at_put(index++, generic_signature_index);
1116   }
1117 
1118   if (_need_verify && length > 1) {
1119     // Check duplicated fields
1120     ResourceMark rm(THREAD);
1121     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1122       THREAD, NameSigHash*, HASH_ROW_SIZE);
1123     initialize_hashtable(names_and_sigs);
1124     bool dup = false;
1125     {
1126       debug_only(No_Safepoint_Verifier nsv;)
1127       for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) {
1128         int name_index = fields->ushort_at(i + instanceKlass::name_index_offset);
1129         symbolOop name = cp->symbol_at(name_index);
1130         int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset);
1131         symbolOop sig = cp->symbol_at(sig_index);
1132         // If no duplicates, add name/signature in hashtable names_and_sigs.
1133         if (!put_after_lookup(name, sig, names_and_sigs)) {
1134           dup = true;
1135           break;
1136         }
1137       }
1138     }
1139     if (dup) {
1140       classfile_parse_error("Duplicate field name&signature in class file %s",
1141                             CHECK_(nullHandle));
1142     }
1143   }
1144 
1145   return fields;
1146 }
1147 
1148 
1149 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1150   while (length-- > 0) {
1151     *dest++ = Bytes::get_Java_u2((u1*) (src++));
1152   }
1153 }
1154 
1155 
1156 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length,
1157                                                        u4 exception_table_length,
1158                                                        constantPoolHandle cp,
1159                                                        TRAPS) {
1160   ClassFileStream* cfs = stream();
1161   typeArrayHandle nullHandle;
1162 
1163   // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index]
1164   typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle));
1165   typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh);
1166 
1167   int index = 0;
1168   cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index
1169   for (unsigned int i = 0; i < exception_table_length; i++) {
1170     u2 start_pc = cfs->get_u2_fast();
1171     u2 end_pc = cfs->get_u2_fast();
1172     u2 handler_pc = cfs->get_u2_fast();
1173     u2 catch_type_index = cfs->get_u2_fast();
1174     // Will check legal target after parsing code array in verifier.
1175     if (_need_verify) {
1176       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1177                          "Illegal exception table range in class file %s", CHECK_(nullHandle));
1178       guarantee_property(handler_pc < code_length,
1179                          "Illegal exception table handler in class file %s", CHECK_(nullHandle));
1180       if (catch_type_index != 0) {
1181         guarantee_property(valid_cp_range(catch_type_index, cp->length()) &&
1182                            is_klass_reference(cp, catch_type_index),
1183                            "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle));
1184       }
1185     }
1186     exception_handlers->int_at_put(index++, start_pc);
1187     exception_handlers->int_at_put(index++, end_pc);
1188     exception_handlers->int_at_put(index++, handler_pc);
1189     exception_handlers->int_at_put(index++, catch_type_index);
1190   }
1191   return exception_handlers;
1192 }
1193 
1194 void ClassFileParser::parse_linenumber_table(
1195     u4 code_attribute_length, u4 code_length,
1196     CompressedLineNumberWriteStream** write_stream, TRAPS) {
1197   ClassFileStream* cfs = stream();
1198   unsigned int num_entries = cfs->get_u2(CHECK);
1199 
1200   // Each entry is a u2 start_pc, and a u2 line_number
1201   unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1202 
1203   // Verify line number attribute and table length
1204   check_property(
1205     code_attribute_length == sizeof(u2) + length_in_bytes,
1206     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1207 
1208   cfs->guarantee_more(length_in_bytes, CHECK);
1209 
1210   if ((*write_stream) == NULL) {
1211     if (length_in_bytes > fixed_buffer_size) {
1212       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1213     } else {
1214       (*write_stream) = new CompressedLineNumberWriteStream(
1215         linenumbertable_buffer, fixed_buffer_size);
1216     }
1217   }
1218 
1219   while (num_entries-- > 0) {
1220     u2 bci  = cfs->get_u2_fast(); // start_pc
1221     u2 line = cfs->get_u2_fast(); // line_number
1222     guarantee_property(bci < code_length,
1223         "Invalid pc in LineNumberTable in class file %s", CHECK);
1224     (*write_stream)->write_pair(bci, line);
1225   }
1226 }
1227 
1228 
1229 // Class file LocalVariableTable elements.
1230 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1231  public:
1232   u2 start_bci;
1233   u2 length;
1234   u2 name_cp_index;
1235   u2 descriptor_cp_index;
1236   u2 slot;
1237 };
1238 
1239 
1240 class LVT_Hash: public CHeapObj {
1241  public:
1242   LocalVariableTableElement  *_elem;  // element
1243   LVT_Hash*                   _next;  // Next entry in hash table
1244 };
1245 
1246 unsigned int hash(LocalVariableTableElement *elem) {
1247   unsigned int raw_hash = elem->start_bci;
1248 
1249   raw_hash = elem->length        + raw_hash * 37;
1250   raw_hash = elem->name_cp_index + raw_hash * 37;
1251   raw_hash = elem->slot          + raw_hash * 37;
1252 
1253   return raw_hash % HASH_ROW_SIZE;
1254 }
1255 
1256 void initialize_hashtable(LVT_Hash** table) {
1257   for (int i = 0; i < HASH_ROW_SIZE; i++) {
1258     table[i] = NULL;
1259   }
1260 }
1261 
1262 void clear_hashtable(LVT_Hash** table) {
1263   for (int i = 0; i < HASH_ROW_SIZE; i++) {
1264     LVT_Hash* current = table[i];
1265     LVT_Hash* next;
1266     while (current != NULL) {
1267       next = current->_next;
1268       current->_next = NULL;
1269       delete(current);
1270       current = next;
1271     }
1272     table[i] = NULL;
1273   }
1274 }
1275 
1276 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1277   LVT_Hash* entry = table[index];
1278 
1279   /*
1280    * 3-tuple start_bci/length/slot has to be unique key,
1281    * so the following comparison seems to be redundant:
1282    *       && elem->name_cp_index == entry->_elem->name_cp_index
1283    */
1284   while (entry != NULL) {
1285     if (elem->start_bci           == entry->_elem->start_bci
1286      && elem->length              == entry->_elem->length
1287      && elem->name_cp_index       == entry->_elem->name_cp_index
1288      && elem->slot                == entry->_elem->slot
1289     ) {
1290       return entry;
1291     }
1292     entry = entry->_next;
1293   }
1294   return NULL;
1295 }
1296 
1297 // Return false if the local variable is found in table.
1298 // Return true if no duplicate is found.
1299 // And local variable is added as a new entry in table.
1300 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1301   // First lookup for duplicates
1302   int index = hash(elem);
1303   LVT_Hash* entry = LVT_lookup(elem, index, table);
1304 
1305   if (entry != NULL) {
1306       return false;
1307   }
1308   // No duplicate is found, allocate a new entry and fill it.
1309   if ((entry = new LVT_Hash()) == NULL) {
1310     return false;
1311   }
1312   entry->_elem = elem;
1313 
1314   // Insert into hash table
1315   entry->_next = table[index];
1316   table[index] = entry;
1317 
1318   return true;
1319 }
1320 
1321 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1322   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1323   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1324   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1325   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1326   lvt->signature_cp_index  = 0;
1327   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1328 }
1329 
1330 // Function is used to parse both attributes:
1331 //       LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1332 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1333                                                u2 max_locals,
1334                                                u4 code_attribute_length,
1335                                                constantPoolHandle cp,
1336                                                u2* localvariable_table_length,
1337                                                bool isLVTT,
1338                                                TRAPS) {
1339   ClassFileStream* cfs = stream();
1340   const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1341   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1342   unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1343   // Verify local variable table attribute has right length
1344   if (_need_verify) {
1345     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1346                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1347   }
1348   u2* localvariable_table_start = cfs->get_u2_buffer();
1349   assert(localvariable_table_start != NULL, "null local variable table");
1350   if (!_need_verify) {
1351     cfs->skip_u2_fast(size);
1352   } else {
1353     cfs->guarantee_more(size * 2, CHECK_NULL);
1354     for(int i = 0; i < (*localvariable_table_length); i++) {
1355       u2 start_pc = cfs->get_u2_fast();
1356       u2 length = cfs->get_u2_fast();
1357       u2 name_index = cfs->get_u2_fast();
1358       u2 descriptor_index = cfs->get_u2_fast();
1359       u2 index = cfs->get_u2_fast();
1360       // Assign to a u4 to avoid overflow
1361       u4 end_pc = (u4)start_pc + (u4)length;
1362 
1363       if (start_pc >= code_length) {
1364         classfile_parse_error(
1365           "Invalid start_pc %u in %s in class file %s",
1366           start_pc, tbl_name, CHECK_NULL);
1367       }
1368       if (end_pc > code_length) {
1369         classfile_parse_error(
1370           "Invalid length %u in %s in class file %s",
1371           length, tbl_name, CHECK_NULL);
1372       }
1373       int cp_size = cp->length();
1374       guarantee_property(
1375         valid_cp_range(name_index, cp_size) &&
1376           cp->tag_at(name_index).is_utf8(),
1377         "Name index %u in %s has bad constant type in class file %s",
1378         name_index, tbl_name, CHECK_NULL);
1379       guarantee_property(
1380         valid_cp_range(descriptor_index, cp_size) &&
1381           cp->tag_at(descriptor_index).is_utf8(),
1382         "Signature index %u in %s has bad constant type in class file %s",
1383         descriptor_index, tbl_name, CHECK_NULL);
1384 
1385       symbolHandle name(THREAD, cp->symbol_at(name_index));
1386       symbolHandle sig(THREAD, cp->symbol_at(descriptor_index));
1387       verify_legal_field_name(name, CHECK_NULL);
1388       u2 extra_slot = 0;
1389       if (!isLVTT) {
1390         verify_legal_field_signature(name, sig, CHECK_NULL);
1391 
1392         // 4894874: check special cases for double and long local variables
1393         if (sig() == vmSymbols::type_signature(T_DOUBLE) ||
1394             sig() == vmSymbols::type_signature(T_LONG)) {
1395           extra_slot = 1;
1396         }
1397       }
1398       guarantee_property((index + extra_slot) < max_locals,
1399                           "Invalid index %u in %s in class file %s",
1400                           index, tbl_name, CHECK_NULL);
1401     }
1402   }
1403   return localvariable_table_start;
1404 }
1405 
1406 
1407 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1408                                       u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) {
1409   ClassFileStream* cfs = stream();
1410   u2 index = 0; // index in the array with long/double occupying two slots
1411   u4 i1 = *u1_index;
1412   u4 i2 = *u2_index + 1;
1413   for(int i = 0; i < array_length; i++) {
1414     u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1415     index++;
1416     if (tag == ITEM_Long || tag == ITEM_Double) {
1417       index++;
1418     } else if (tag == ITEM_Object) {
1419       u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1420       guarantee_property(valid_cp_range(class_index, cp->length()) &&
1421                          is_klass_reference(cp, class_index),
1422                          "Bad class index %u in StackMap in class file %s",
1423                          class_index, CHECK);
1424     } else if (tag == ITEM_Uninitialized) {
1425       u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1426       guarantee_property(
1427         offset < code_length,
1428         "Bad uninitialized type offset %u in StackMap in class file %s",
1429         offset, CHECK);
1430     } else {
1431       guarantee_property(
1432         tag <= (u1)ITEM_Uninitialized,
1433         "Unknown variable type %u in StackMap in class file %s",
1434         tag, CHECK);
1435     }
1436   }
1437   u2_array[*u2_index] = index;
1438   *u1_index = i1;
1439   *u2_index = i2;
1440 }
1441 
1442 typeArrayOop ClassFileParser::parse_stackmap_table(
1443     u4 code_attribute_length, TRAPS) {
1444   if (code_attribute_length == 0)
1445     return NULL;
1446 
1447   ClassFileStream* cfs = stream();
1448   u1* stackmap_table_start = cfs->get_u1_buffer();
1449   assert(stackmap_table_start != NULL, "null stackmap table");
1450 
1451   // check code_attribute_length first
1452   stream()->skip_u1(code_attribute_length, CHECK_NULL);
1453 
1454   if (!_need_verify && !DumpSharedSpaces) {
1455     return NULL;
1456   }
1457 
1458   typeArrayOop stackmap_data =
1459     oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL);
1460 
1461   stackmap_data->set_length(code_attribute_length);
1462   memcpy((void*)stackmap_data->byte_at_addr(0),
1463          (void*)stackmap_table_start, code_attribute_length);
1464   return stackmap_data;
1465 }
1466 
1467 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1468                                               u4 method_attribute_length,
1469                                               constantPoolHandle cp, TRAPS) {
1470   ClassFileStream* cfs = stream();
1471   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1472   *checked_exceptions_length = cfs->get_u2_fast();
1473   unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1474   u2* checked_exceptions_start = cfs->get_u2_buffer();
1475   assert(checked_exceptions_start != NULL, "null checked exceptions");
1476   if (!_need_verify) {
1477     cfs->skip_u2_fast(size);
1478   } else {
1479     // Verify each value in the checked exception table
1480     u2 checked_exception;
1481     u2 len = *checked_exceptions_length;
1482     cfs->guarantee_more(2 * len, CHECK_NULL);
1483     for (int i = 0; i < len; i++) {
1484       checked_exception = cfs->get_u2_fast();
1485       check_property(
1486         valid_cp_range(checked_exception, cp->length()) &&
1487         is_klass_reference(cp, checked_exception),
1488         "Exception name has bad type at constant pool %u in class file %s",
1489         checked_exception, CHECK_NULL);
1490     }
1491   }
1492   // check exceptions attribute length
1493   if (_need_verify) {
1494     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1495                                                    sizeof(u2) * size),
1496                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1497   }
1498   return checked_exceptions_start;
1499 }
1500 
1501 void ClassFileParser::throwIllegalSignature(
1502     const char* type, symbolHandle name, symbolHandle sig, TRAPS) {
1503   ResourceMark rm(THREAD);
1504   Exceptions::fthrow(THREAD_AND_LOCATION,
1505       vmSymbols::java_lang_ClassFormatError(),
1506       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1507       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1508 }
1509 
1510 #define MAX_ARGS_SIZE 255
1511 #define MAX_CODE_SIZE 65535
1512 #define INITIAL_MAX_LVT_NUMBER 256
1513 
1514 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1515 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the
1516 // methodOop to save footprint, so we only know the size of the resulting methodOop when the
1517 // entire method attribute is parsed.
1518 //
1519 // The promoted_flags parameter is used to pass relevant access_flags
1520 // from the method back up to the containing klass. These flag values
1521 // are added to klass's access_flags.
1522 
1523 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface,
1524                                            AccessFlags *promoted_flags,
1525                                            typeArrayHandle* method_annotations,
1526                                            typeArrayHandle* method_parameter_annotations,
1527                                            typeArrayHandle* method_default_annotations,
1528                                            TRAPS) {
1529   ClassFileStream* cfs = stream();
1530   methodHandle nullHandle;
1531   ResourceMark rm(THREAD);
1532   // Parse fixed parts
1533   cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1534 
1535   int flags = cfs->get_u2_fast();
1536   u2 name_index = cfs->get_u2_fast();
1537   int cp_size = cp->length();
1538   check_property(
1539     valid_cp_range(name_index, cp_size) &&
1540       cp->tag_at(name_index).is_utf8(),
1541     "Illegal constant pool index %u for method name in class file %s",
1542     name_index, CHECK_(nullHandle));
1543   symbolHandle name(THREAD, cp->symbol_at(name_index));
1544   verify_legal_method_name(name, CHECK_(nullHandle));
1545 
1546   u2 signature_index = cfs->get_u2_fast();
1547   guarantee_property(
1548     valid_cp_range(signature_index, cp_size) &&
1549       cp->tag_at(signature_index).is_utf8(),
1550     "Illegal constant pool index %u for method signature in class file %s",
1551     signature_index, CHECK_(nullHandle));
1552   symbolHandle signature(THREAD, cp->symbol_at(signature_index));
1553 
1554   AccessFlags access_flags;
1555   if (name == vmSymbols::class_initializer_name()) {
1556     // We ignore the access flags for a class initializer. (JVM Spec. p. 116)
1557     flags = JVM_ACC_STATIC;
1558   } else {
1559     verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1560   }
1561 
1562   int args_size = -1;  // only used when _need_verify is true
1563   if (_need_verify) {
1564     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1565                  verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1566     if (args_size > MAX_ARGS_SIZE) {
1567       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1568     }
1569   }
1570 
1571   access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1572 
1573   // Default values for code and exceptions attribute elements
1574   u2 max_stack = 0;
1575   u2 max_locals = 0;
1576   u4 code_length = 0;
1577   u1* code_start = 0;
1578   u2 exception_table_length = 0;
1579   typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array());
1580   u2 checked_exceptions_length = 0;
1581   u2* checked_exceptions_start = NULL;
1582   CompressedLineNumberWriteStream* linenumber_table = NULL;
1583   int linenumber_table_length = 0;
1584   int total_lvt_length = 0;
1585   u2 lvt_cnt = 0;
1586   u2 lvtt_cnt = 0;
1587   bool lvt_allocated = false;
1588   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
1589   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
1590   u2* localvariable_table_length;
1591   u2** localvariable_table_start;
1592   u2* localvariable_type_table_length;
1593   u2** localvariable_type_table_start;
1594   bool parsed_code_attribute = false;
1595   bool parsed_checked_exceptions_attribute = false;
1596   bool parsed_stackmap_attribute = false;
1597   // stackmap attribute - JDK1.5
1598   typeArrayHandle stackmap_data;
1599   u2 generic_signature_index = 0;
1600   u1* runtime_visible_annotations = NULL;
1601   int runtime_visible_annotations_length = 0;
1602   u1* runtime_invisible_annotations = NULL;
1603   int runtime_invisible_annotations_length = 0;
1604   u1* runtime_visible_parameter_annotations = NULL;
1605   int runtime_visible_parameter_annotations_length = 0;
1606   u1* runtime_invisible_parameter_annotations = NULL;
1607   int runtime_invisible_parameter_annotations_length = 0;
1608   u1* annotation_default = NULL;
1609   int annotation_default_length = 0;
1610 
1611   // Parse code and exceptions attribute
1612   u2 method_attributes_count = cfs->get_u2_fast();
1613   while (method_attributes_count--) {
1614     cfs->guarantee_more(6, CHECK_(nullHandle));  // method_attribute_name_index, method_attribute_length
1615     u2 method_attribute_name_index = cfs->get_u2_fast();
1616     u4 method_attribute_length = cfs->get_u4_fast();
1617     check_property(
1618       valid_cp_range(method_attribute_name_index, cp_size) &&
1619         cp->tag_at(method_attribute_name_index).is_utf8(),
1620       "Invalid method attribute name index %u in class file %s",
1621       method_attribute_name_index, CHECK_(nullHandle));
1622 
1623     symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index);
1624     if (method_attribute_name == vmSymbols::tag_code()) {
1625       // Parse Code attribute
1626       if (_need_verify) {
1627         guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(),
1628                         "Code attribute in native or abstract methods in class file %s",
1629                          CHECK_(nullHandle));
1630       }
1631       if (parsed_code_attribute) {
1632         classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
1633       }
1634       parsed_code_attribute = true;
1635 
1636       // Stack size, locals size, and code size
1637       if (_major_version == 45 && _minor_version <= 2) {
1638         cfs->guarantee_more(4, CHECK_(nullHandle));
1639         max_stack = cfs->get_u1_fast();
1640         max_locals = cfs->get_u1_fast();
1641         code_length = cfs->get_u2_fast();
1642       } else {
1643         cfs->guarantee_more(8, CHECK_(nullHandle));
1644         max_stack = cfs->get_u2_fast();
1645         max_locals = cfs->get_u2_fast();
1646         code_length = cfs->get_u4_fast();
1647       }
1648       if (_need_verify) {
1649         guarantee_property(args_size <= max_locals,
1650                            "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
1651         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
1652                            "Invalid method Code length %u in class file %s",
1653                            code_length, CHECK_(nullHandle));
1654       }
1655       // Code pointer
1656       code_start = cfs->get_u1_buffer();
1657       assert(code_start != NULL, "null code start");
1658       cfs->guarantee_more(code_length, CHECK_(nullHandle));
1659       cfs->skip_u1_fast(code_length);
1660 
1661       // Exception handler table
1662       cfs->guarantee_more(2, CHECK_(nullHandle));  // exception_table_length
1663       exception_table_length = cfs->get_u2_fast();
1664       if (exception_table_length > 0) {
1665         exception_handlers =
1666               parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle));
1667       }
1668 
1669       // Parse additional attributes in code attribute
1670       cfs->guarantee_more(2, CHECK_(nullHandle));  // code_attributes_count
1671       u2 code_attributes_count = cfs->get_u2_fast();
1672 
1673       unsigned int calculated_attribute_length = 0;
1674 
1675       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
1676         calculated_attribute_length =
1677             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
1678       } else {
1679         // max_stack, locals and length are smaller in pre-version 45.2 classes
1680         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
1681       }
1682       calculated_attribute_length +=
1683         code_length +
1684         sizeof(exception_table_length) +
1685         sizeof(code_attributes_count) +
1686         exception_table_length *
1687             ( sizeof(u2) +   // start_pc
1688               sizeof(u2) +   // end_pc
1689               sizeof(u2) +   // handler_pc
1690               sizeof(u2) );  // catch_type_index
1691 
1692       while (code_attributes_count--) {
1693         cfs->guarantee_more(6, CHECK_(nullHandle));  // code_attribute_name_index, code_attribute_length
1694         u2 code_attribute_name_index = cfs->get_u2_fast();
1695         u4 code_attribute_length = cfs->get_u4_fast();
1696         calculated_attribute_length += code_attribute_length +
1697                                        sizeof(code_attribute_name_index) +
1698                                        sizeof(code_attribute_length);
1699         check_property(valid_cp_range(code_attribute_name_index, cp_size) &&
1700                        cp->tag_at(code_attribute_name_index).is_utf8(),
1701                        "Invalid code attribute name index %u in class file %s",
1702                        code_attribute_name_index,
1703                        CHECK_(nullHandle));
1704         if (LoadLineNumberTables &&
1705             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
1706           // Parse and compress line number table
1707           parse_linenumber_table(code_attribute_length, code_length,
1708             &linenumber_table, CHECK_(nullHandle));
1709 
1710         } else if (LoadLocalVariableTables &&
1711                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
1712           // Parse local variable table
1713           if (!lvt_allocated) {
1714             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1715               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1716             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1717               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1718             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1719               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1720             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1721               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1722             lvt_allocated = true;
1723           }
1724           if (lvt_cnt == max_lvt_cnt) {
1725             max_lvt_cnt <<= 1;
1726             REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
1727             REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
1728           }
1729           localvariable_table_start[lvt_cnt] =
1730             parse_localvariable_table(code_length,
1731                                       max_locals,
1732                                       code_attribute_length,
1733                                       cp,
1734                                       &localvariable_table_length[lvt_cnt],
1735                                       false,    // is not LVTT
1736                                       CHECK_(nullHandle));
1737           total_lvt_length += localvariable_table_length[lvt_cnt];
1738           lvt_cnt++;
1739         } else if (LoadLocalVariableTypeTables &&
1740                    _major_version >= JAVA_1_5_VERSION &&
1741                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
1742           if (!lvt_allocated) {
1743             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1744               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1745             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1746               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1747             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
1748               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
1749             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
1750               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
1751             lvt_allocated = true;
1752           }
1753           // Parse local variable type table
1754           if (lvtt_cnt == max_lvtt_cnt) {
1755             max_lvtt_cnt <<= 1;
1756             REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
1757             REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
1758           }
1759           localvariable_type_table_start[lvtt_cnt] =
1760             parse_localvariable_table(code_length,
1761                                       max_locals,
1762                                       code_attribute_length,
1763                                       cp,
1764                                       &localvariable_type_table_length[lvtt_cnt],
1765                                       true,     // is LVTT
1766                                       CHECK_(nullHandle));
1767           lvtt_cnt++;
1768         } else if (UseSplitVerifier &&
1769                    _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
1770                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
1771           // Stack map is only needed by the new verifier in JDK1.5.
1772           if (parsed_stackmap_attribute) {
1773             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
1774           }
1775           typeArrayOop sm =
1776             parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
1777           stackmap_data = typeArrayHandle(THREAD, sm);
1778           parsed_stackmap_attribute = true;
1779         } else {
1780           // Skip unknown attributes
1781           cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
1782         }
1783       }
1784       // check method attribute length
1785       if (_need_verify) {
1786         guarantee_property(method_attribute_length == calculated_attribute_length,
1787                            "Code segment has wrong length in class file %s", CHECK_(nullHandle));
1788       }
1789     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
1790       // Parse Exceptions attribute
1791       if (parsed_checked_exceptions_attribute) {
1792         classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
1793       }
1794       parsed_checked_exceptions_attribute = true;
1795       checked_exceptions_start =
1796             parse_checked_exceptions(&checked_exceptions_length,
1797                                      method_attribute_length,
1798                                      cp, CHECK_(nullHandle));
1799     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
1800       if (method_attribute_length != 0) {
1801         classfile_parse_error(
1802           "Invalid Synthetic method attribute length %u in class file %s",
1803           method_attribute_length, CHECK_(nullHandle));
1804       }
1805       // Should we check that there hasn't already been a synthetic attribute?
1806       access_flags.set_is_synthetic();
1807     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1808       if (method_attribute_length != 0) {
1809         classfile_parse_error(
1810           "Invalid Deprecated method attribute length %u in class file %s",
1811           method_attribute_length, CHECK_(nullHandle));
1812       }
1813     } else if (_major_version >= JAVA_1_5_VERSION) {
1814       if (method_attribute_name == vmSymbols::tag_signature()) {
1815         if (method_attribute_length != 2) {
1816           classfile_parse_error(
1817             "Invalid Signature attribute length %u in class file %s",
1818             method_attribute_length, CHECK_(nullHandle));
1819         }
1820         cfs->guarantee_more(2, CHECK_(nullHandle));  // generic_signature_index
1821         generic_signature_index = cfs->get_u2_fast();
1822       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1823         runtime_visible_annotations_length = method_attribute_length;
1824         runtime_visible_annotations = cfs->get_u1_buffer();
1825         assert(runtime_visible_annotations != NULL, "null visible annotations");
1826         cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
1827       } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1828         runtime_invisible_annotations_length = method_attribute_length;
1829         runtime_invisible_annotations = cfs->get_u1_buffer();
1830         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1831         cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
1832       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
1833         runtime_visible_parameter_annotations_length = method_attribute_length;
1834         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
1835         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
1836         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
1837       } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
1838         runtime_invisible_parameter_annotations_length = method_attribute_length;
1839         runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
1840         assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
1841         cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
1842       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
1843         annotation_default_length = method_attribute_length;
1844         annotation_default = cfs->get_u1_buffer();
1845         assert(annotation_default != NULL, "null annotation default");
1846         cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
1847       } else {
1848         // Skip unknown attributes
1849         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1850       }
1851     } else {
1852       // Skip unknown attributes
1853       cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
1854     }
1855   }
1856 
1857   if (linenumber_table != NULL) {
1858     linenumber_table->write_terminator();
1859     linenumber_table_length = linenumber_table->position();
1860   }
1861 
1862   // Make sure there's at least one Code attribute in non-native/non-abstract method
1863   if (_need_verify) {
1864     guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
1865                       "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
1866   }
1867 
1868   // All sizing information for a methodOop is finally available, now create it
1869   methodOop m_oop  = oopFactory::new_method(
1870     code_length, access_flags, linenumber_table_length,
1871     total_lvt_length, checked_exceptions_length,
1872     methodOopDesc::IsSafeConc, CHECK_(nullHandle));
1873   methodHandle m (THREAD, m_oop);
1874 
1875   ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize);
1876 
1877   // Fill in information from fixed part (access_flags already set)
1878   m->set_constants(cp());
1879   m->set_name_index(name_index);
1880   m->set_signature_index(signature_index);
1881   m->set_generic_signature_index(generic_signature_index);
1882 #ifdef CC_INTERP
1883   // hmm is there a gc issue here??
1884   ResultTypeFinder rtf(cp->symbol_at(signature_index));
1885   m->set_result_index(rtf.type());
1886 #endif
1887 
1888   if (args_size >= 0) {
1889     m->set_size_of_parameters(args_size);
1890   } else {
1891     m->compute_size_of_parameters(THREAD);
1892   }
1893 #ifdef ASSERT
1894   if (args_size >= 0) {
1895     m->compute_size_of_parameters(THREAD);
1896     assert(args_size == m->size_of_parameters(), "");
1897   }
1898 #endif
1899 
1900   // Fill in code attribute information
1901   m->set_max_stack(max_stack);
1902   m->set_max_locals(max_locals);
1903   m->constMethod()->set_stackmap_data(stackmap_data());
1904 
1905   /**
1906    * The exception_table field is the flag used to indicate
1907    * that the methodOop and it's associated constMethodOop are partially
1908    * initialized and thus are exempt from pre/post GC verification.  Once
1909    * the field is set, the oops are considered fully initialized so make
1910    * sure that the oops can pass verification when this field is set.
1911    */
1912   m->set_exception_table(exception_handlers());
1913 
1914   // Copy byte codes
1915   m->set_code(code_start);
1916 
1917   // Copy line number table
1918   if (linenumber_table != NULL) {
1919     memcpy(m->compressed_linenumber_table(),
1920            linenumber_table->buffer(), linenumber_table_length);
1921   }
1922 
1923   // Copy checked exceptions
1924   if (checked_exceptions_length > 0) {
1925     int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
1926     copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
1927   }
1928 
1929   /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1930    *
1931    * Rules for LVT's and LVTT's are:
1932    *   - There can be any number of LVT's and LVTT's.
1933    *   - If there are n LVT's, it is the same as if there was just
1934    *     one LVT containing all the entries from the n LVT's.
1935    *   - There may be no more than one LVT entry per local variable.
1936    *     Two LVT entries are 'equal' if these fields are the same:
1937    *        start_pc, length, name, slot
1938    *   - There may be no more than one LVTT entry per each LVT entry.
1939    *     Each LVTT entry has to match some LVT entry.
1940    *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1941    */
1942   if (total_lvt_length > 0) {
1943     int tbl_no, idx;
1944 
1945     promoted_flags->set_has_localvariable_table();
1946 
1947     LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1948     initialize_hashtable(lvt_Hash);
1949 
1950     // To fill LocalVariableTable in
1951     Classfile_LVT_Element*  cf_lvt;
1952     LocalVariableTableElement* lvt = m->localvariable_table_start();
1953 
1954     for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1955       cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1956       for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1957         copy_lvt_element(&cf_lvt[idx], lvt);
1958         // If no duplicates, add LVT elem in hashtable lvt_Hash.
1959         if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1960           && _need_verify
1961           && _major_version >= JAVA_1_5_VERSION ) {
1962           clear_hashtable(lvt_Hash);
1963           classfile_parse_error("Duplicated LocalVariableTable attribute "
1964                                 "entry for '%s' in class file %s",
1965                                  cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1966                                  CHECK_(nullHandle));
1967         }
1968       }
1969     }
1970 
1971     // To merge LocalVariableTable and LocalVariableTypeTable
1972     Classfile_LVT_Element* cf_lvtt;
1973     LocalVariableTableElement lvtt_elem;
1974 
1975     for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1976       cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1977       for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1978         copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1979         int index = hash(&lvtt_elem);
1980         LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1981         if (entry == NULL) {
1982           if (_need_verify) {
1983             clear_hashtable(lvt_Hash);
1984             classfile_parse_error("LVTT entry for '%s' in class file %s "
1985                                   "does not match any LVT entry",
1986                                    cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1987                                    CHECK_(nullHandle));
1988           }
1989         } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1990           clear_hashtable(lvt_Hash);
1991           classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1992                                 "entry for '%s' in class file %s",
1993                                  cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1994                                  CHECK_(nullHandle));
1995         } else {
1996           // to add generic signatures into LocalVariableTable
1997           entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1998         }
1999       }
2000     }
2001     clear_hashtable(lvt_Hash);
2002   }
2003 
2004   *method_annotations = assemble_annotations(runtime_visible_annotations,
2005                                              runtime_visible_annotations_length,
2006                                              runtime_invisible_annotations,
2007                                              runtime_invisible_annotations_length,
2008                                              CHECK_(nullHandle));
2009   *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations,
2010                                                        runtime_visible_parameter_annotations_length,
2011                                                        runtime_invisible_parameter_annotations,
2012                                                        runtime_invisible_parameter_annotations_length,
2013                                                        CHECK_(nullHandle));
2014   *method_default_annotations = assemble_annotations(annotation_default,
2015                                                      annotation_default_length,
2016                                                      NULL,
2017                                                      0,
2018                                                      CHECK_(nullHandle));
2019 
2020   if (name() == vmSymbols::finalize_method_name() &&
2021       signature() == vmSymbols::void_method_signature()) {
2022     if (m->is_empty_method()) {
2023       _has_empty_finalizer = true;
2024     } else {
2025       _has_finalizer = true;
2026     }
2027   }
2028   if (name() == vmSymbols::object_initializer_name() &&
2029       signature() == vmSymbols::void_method_signature() &&
2030       m->is_vanilla_constructor()) {
2031     _has_vanilla_constructor = true;
2032   }
2033 
2034   if (EnableMethodHandles && (m->is_method_handle_invoke() ||
2035                               m->is_method_handle_adapter())) {
2036     THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(),
2037                "Method handle invokers must be defined internally to the VM", nullHandle);
2038   }
2039 
2040   return m;
2041 }
2042 
2043 
2044 // The promoted_flags parameter is used to pass relevant access_flags
2045 // from the methods back up to the containing klass. These flag values
2046 // are added to klass's access_flags.
2047 
2048 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface,
2049                                               AccessFlags* promoted_flags,
2050                                               bool* has_final_method,
2051                                               objArrayOop* methods_annotations_oop,
2052                                               objArrayOop* methods_parameter_annotations_oop,
2053                                               objArrayOop* methods_default_annotations_oop,
2054                                               TRAPS) {
2055   ClassFileStream* cfs = stream();
2056   objArrayHandle nullHandle;
2057   typeArrayHandle method_annotations;
2058   typeArrayHandle method_parameter_annotations;
2059   typeArrayHandle method_default_annotations;
2060   cfs->guarantee_more(2, CHECK_(nullHandle));  // length
2061   u2 length = cfs->get_u2_fast();
2062   if (length == 0) {
2063     return objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2064   } else {
2065     objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2066     objArrayHandle methods(THREAD, m);
2067     HandleMark hm(THREAD);
2068     objArrayHandle methods_annotations;
2069     objArrayHandle methods_parameter_annotations;
2070     objArrayHandle methods_default_annotations;
2071     for (int index = 0; index < length; index++) {
2072       methodHandle method = parse_method(cp, is_interface,
2073                                          promoted_flags,
2074                                          &method_annotations,
2075                                          &method_parameter_annotations,
2076                                          &method_default_annotations,
2077                                          CHECK_(nullHandle));
2078       if (method->is_final()) {
2079         *has_final_method = true;
2080       }
2081       methods->obj_at_put(index, method());
2082       if (method_annotations.not_null()) {
2083         if (methods_annotations.is_null()) {
2084           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2085           methods_annotations = objArrayHandle(THREAD, md);
2086         }
2087         methods_annotations->obj_at_put(index, method_annotations());
2088       }
2089       if (method_parameter_annotations.not_null()) {
2090         if (methods_parameter_annotations.is_null()) {
2091           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2092           methods_parameter_annotations = objArrayHandle(THREAD, md);
2093         }
2094         methods_parameter_annotations->obj_at_put(index, method_parameter_annotations());
2095       }
2096       if (method_default_annotations.not_null()) {
2097         if (methods_default_annotations.is_null()) {
2098           objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle));
2099           methods_default_annotations = objArrayHandle(THREAD, md);
2100         }
2101         methods_default_annotations->obj_at_put(index, method_default_annotations());
2102       }
2103     }
2104     if (_need_verify && length > 1) {
2105       // Check duplicated methods
2106       ResourceMark rm(THREAD);
2107       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2108         THREAD, NameSigHash*, HASH_ROW_SIZE);
2109       initialize_hashtable(names_and_sigs);
2110       bool dup = false;
2111       {
2112         debug_only(No_Safepoint_Verifier nsv;)
2113         for (int i = 0; i < length; i++) {
2114           methodOop m = (methodOop)methods->obj_at(i);
2115           // If no duplicates, add name/signature in hashtable names_and_sigs.
2116           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2117             dup = true;
2118             break;
2119           }
2120         }
2121       }
2122       if (dup) {
2123         classfile_parse_error("Duplicate method name&signature in class file %s",
2124                               CHECK_(nullHandle));
2125       }
2126     }
2127 
2128     *methods_annotations_oop = methods_annotations();
2129     *methods_parameter_annotations_oop = methods_parameter_annotations();
2130     *methods_default_annotations_oop = methods_default_annotations();
2131 
2132     return methods;
2133   }
2134 }
2135 
2136 
2137 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods,
2138                                               objArrayHandle methods_annotations,
2139                                               objArrayHandle methods_parameter_annotations,
2140                                               objArrayHandle methods_default_annotations,
2141                                               TRAPS) {
2142   typeArrayHandle nullHandle;
2143   int length = methods()->length();
2144   // If JVMTI original method ordering is enabled we have to
2145   // remember the original class file ordering.
2146   // We temporarily use the vtable_index field in the methodOop to store the
2147   // class file index, so we can read in after calling qsort.
2148   if (JvmtiExport::can_maintain_original_method_order()) {
2149     for (int index = 0; index < length; index++) {
2150       methodOop m = methodOop(methods->obj_at(index));
2151       assert(!m->valid_vtable_index(), "vtable index should not be set");
2152       m->set_vtable_index(index);
2153     }
2154   }
2155   // Sort method array by ascending method name (for faster lookups & vtable construction)
2156   // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare
2157   methodOopDesc::sort_methods(methods(),
2158                               methods_annotations(),
2159                               methods_parameter_annotations(),
2160                               methods_default_annotations());
2161 
2162   // If JVMTI original method ordering is enabled construct int array remembering the original ordering
2163   if (JvmtiExport::can_maintain_original_method_order()) {
2164     typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle));
2165     typeArrayHandle method_ordering(THREAD, new_ordering);
2166     for (int index = 0; index < length; index++) {
2167       methodOop m = methodOop(methods->obj_at(index));
2168       int old_index = m->vtable_index();
2169       assert(old_index >= 0 && old_index < length, "invalid method index");
2170       method_ordering->int_at_put(index, old_index);
2171       m->set_vtable_index(methodOopDesc::invalid_vtable_index);
2172     }
2173     return method_ordering;
2174   } else {
2175     return typeArrayHandle(THREAD, Universe::the_empty_int_array());
2176   }
2177 }
2178 
2179 
2180 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2181   ClassFileStream* cfs = stream();
2182   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2183   u2 sourcefile_index = cfs->get_u2_fast();
2184   check_property(
2185     valid_cp_range(sourcefile_index, cp->length()) &&
2186       cp->tag_at(sourcefile_index).is_utf8(),
2187     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2188     sourcefile_index, CHECK);
2189   k->set_source_file_name(cp->symbol_at(sourcefile_index));
2190 }
2191 
2192 
2193 
2194 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp,
2195                                                                        instanceKlassHandle k,
2196                                                                        int length, TRAPS) {
2197   ClassFileStream* cfs = stream();
2198   u1* sde_buffer = cfs->get_u1_buffer();
2199   assert(sde_buffer != NULL, "null sde buffer");
2200 
2201   // Don't bother storing it if there is no way to retrieve it
2202   if (JvmtiExport::can_get_source_debug_extension()) {
2203     // Optimistically assume that only 1 byte UTF format is used
2204     // (common case)
2205     symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer,
2206                                                   length, CHECK);
2207     k->set_source_debug_extension(sde_symbol);
2208   }
2209   // Got utf8 string, set stream position forward
2210   cfs->skip_u1(length, CHECK);
2211 }
2212 
2213 
2214 // Inner classes can be static, private or protected (classic VM does this)
2215 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2216 
2217 // Return number of classes in the inner classes attribute table
2218 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2219   ClassFileStream* cfs = stream();
2220   cfs->guarantee_more(2, CHECK_0);  // length
2221   u2 length = cfs->get_u2_fast();
2222 
2223   // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags]
2224   typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0);
2225   typeArrayHandle inner_classes(THREAD, ic);
2226   int index = 0;
2227   int cp_size = cp->length();
2228   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
2229   for (int n = 0; n < length; n++) {
2230     // Inner class index
2231     u2 inner_class_info_index = cfs->get_u2_fast();
2232     check_property(
2233       inner_class_info_index == 0 ||
2234         (valid_cp_range(inner_class_info_index, cp_size) &&
2235         is_klass_reference(cp, inner_class_info_index)),
2236       "inner_class_info_index %u has bad constant type in class file %s",
2237       inner_class_info_index, CHECK_0);
2238     // Outer class index
2239     u2 outer_class_info_index = cfs->get_u2_fast();
2240     check_property(
2241       outer_class_info_index == 0 ||
2242         (valid_cp_range(outer_class_info_index, cp_size) &&
2243         is_klass_reference(cp, outer_class_info_index)),
2244       "outer_class_info_index %u has bad constant type in class file %s",
2245       outer_class_info_index, CHECK_0);
2246     // Inner class name
2247     u2 inner_name_index = cfs->get_u2_fast();
2248     check_property(
2249       inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) &&
2250         cp->tag_at(inner_name_index).is_utf8()),
2251       "inner_name_index %u has bad constant type in class file %s",
2252       inner_name_index, CHECK_0);
2253     if (_need_verify) {
2254       guarantee_property(inner_class_info_index != outer_class_info_index,
2255                          "Class is both outer and inner class in class file %s", CHECK_0);
2256     }
2257     // Access flags
2258     AccessFlags inner_access_flags;
2259     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2260     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2261       // Set abstract bit for old class files for backward compatibility
2262       flags |= JVM_ACC_ABSTRACT;
2263     }
2264     verify_legal_class_modifiers(flags, CHECK_0);
2265     inner_access_flags.set_flags(flags);
2266 
2267     inner_classes->short_at_put(index++, inner_class_info_index);
2268     inner_classes->short_at_put(index++, outer_class_info_index);
2269     inner_classes->short_at_put(index++, inner_name_index);
2270     inner_classes->short_at_put(index++, inner_access_flags.as_short());
2271   }
2272 
2273   // 4347400: make sure there's no duplicate entry in the classes array
2274   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2275     for(int i = 0; i < inner_classes->length(); i += 4) {
2276       for(int j = i + 4; j < inner_classes->length(); j += 4) {
2277         guarantee_property((inner_classes->ushort_at(i)   != inner_classes->ushort_at(j) ||
2278                             inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) ||
2279                             inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) ||
2280                             inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)),
2281                             "Duplicate entry in InnerClasses in class file %s",
2282                             CHECK_0);
2283       }
2284     }
2285   }
2286 
2287   // Update instanceKlass with inner class info.
2288   k->set_inner_classes(inner_classes());
2289   return length;
2290 }
2291 
2292 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2293   k->set_is_synthetic();
2294 }
2295 
2296 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2297   ClassFileStream* cfs = stream();
2298   u2 signature_index = cfs->get_u2(CHECK);
2299   check_property(
2300     valid_cp_range(signature_index, cp->length()) &&
2301       cp->tag_at(signature_index).is_utf8(),
2302     "Invalid constant pool index %u in Signature attribute in class file %s",
2303     signature_index, CHECK);
2304   k->set_generic_signature(cp->symbol_at(signature_index));
2305 }
2306 
2307 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) {
2308   ClassFileStream* cfs = stream();
2309   // Set inner classes attribute to default sentinel
2310   k->set_inner_classes(Universe::the_empty_short_array());
2311   cfs->guarantee_more(2, CHECK);  // attributes_count
2312   u2 attributes_count = cfs->get_u2_fast();
2313   bool parsed_sourcefile_attribute = false;
2314   bool parsed_innerclasses_attribute = false;
2315   bool parsed_enclosingmethod_attribute = false;
2316   u1* runtime_visible_annotations = NULL;
2317   int runtime_visible_annotations_length = 0;
2318   u1* runtime_invisible_annotations = NULL;
2319   int runtime_invisible_annotations_length = 0;
2320   // Iterate over attributes
2321   while (attributes_count--) {
2322     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
2323     u2 attribute_name_index = cfs->get_u2_fast();
2324     u4 attribute_length = cfs->get_u4_fast();
2325     check_property(
2326       valid_cp_range(attribute_name_index, cp->length()) &&
2327         cp->tag_at(attribute_name_index).is_utf8(),
2328       "Attribute name has bad constant pool index %u in class file %s",
2329       attribute_name_index, CHECK);
2330     symbolOop tag = cp->symbol_at(attribute_name_index);
2331     if (tag == vmSymbols::tag_source_file()) {
2332       // Check for SourceFile tag
2333       if (_need_verify) {
2334         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2335       }
2336       if (parsed_sourcefile_attribute) {
2337         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2338       } else {
2339         parsed_sourcefile_attribute = true;
2340       }
2341       parse_classfile_sourcefile_attribute(cp, k, CHECK);
2342     } else if (tag == vmSymbols::tag_source_debug_extension()) {
2343       // Check for SourceDebugExtension tag
2344       parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK);
2345     } else if (tag == vmSymbols::tag_inner_classes()) {
2346       // Check for InnerClasses tag
2347       if (parsed_innerclasses_attribute) {
2348         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2349       } else {
2350         parsed_innerclasses_attribute = true;
2351       }
2352       u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK);
2353       if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2354         guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2355                           "Wrong InnerClasses attribute length in class file %s", CHECK);
2356       }
2357     } else if (tag == vmSymbols::tag_synthetic()) {
2358       // Check for Synthetic tag
2359       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2360       if (attribute_length != 0) {
2361         classfile_parse_error(
2362           "Invalid Synthetic classfile attribute length %u in class file %s",
2363           attribute_length, CHECK);
2364       }
2365       parse_classfile_synthetic_attribute(cp, k, CHECK);
2366     } else if (tag == vmSymbols::tag_deprecated()) {
2367       // Check for Deprecatd tag - 4276120
2368       if (attribute_length != 0) {
2369         classfile_parse_error(
2370           "Invalid Deprecated classfile attribute length %u in class file %s",
2371           attribute_length, CHECK);
2372       }
2373     } else if (_major_version >= JAVA_1_5_VERSION) {
2374       if (tag == vmSymbols::tag_signature()) {
2375         if (attribute_length != 2) {
2376           classfile_parse_error(
2377             "Wrong Signature attribute length %u in class file %s",
2378             attribute_length, CHECK);
2379         }
2380         parse_classfile_signature_attribute(cp, k, CHECK);
2381       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2382         runtime_visible_annotations_length = attribute_length;
2383         runtime_visible_annotations = cfs->get_u1_buffer();
2384         assert(runtime_visible_annotations != NULL, "null visible annotations");
2385         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2386       } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2387         runtime_invisible_annotations_length = attribute_length;
2388         runtime_invisible_annotations = cfs->get_u1_buffer();
2389         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2390         cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2391       } else if (tag == vmSymbols::tag_enclosing_method()) {
2392         if (parsed_enclosingmethod_attribute) {
2393           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2394         }   else {
2395           parsed_enclosingmethod_attribute = true;
2396         }
2397         cfs->guarantee_more(4, CHECK);  // class_index, method_index
2398         u2 class_index  = cfs->get_u2_fast();
2399         u2 method_index = cfs->get_u2_fast();
2400         if (class_index == 0) {
2401           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2402         }
2403         // Validate the constant pool indices and types
2404         if (!cp->is_within_bounds(class_index) ||
2405             !is_klass_reference(cp, class_index)) {
2406           classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2407         }
2408         if (method_index != 0 &&
2409             (!cp->is_within_bounds(method_index) ||
2410              !cp->tag_at(method_index).is_name_and_type())) {
2411           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2412         }
2413         k->set_enclosing_method_indices(class_index, method_index);
2414       } else {
2415         // Unknown attribute
2416         cfs->skip_u1(attribute_length, CHECK);
2417       }
2418     } else {
2419       // Unknown attribute
2420       cfs->skip_u1(attribute_length, CHECK);
2421     }
2422   }
2423   typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations,
2424                                                      runtime_visible_annotations_length,
2425                                                      runtime_invisible_annotations,
2426                                                      runtime_invisible_annotations_length,
2427                                                      CHECK);
2428   k->set_class_annotations(annotations());
2429 }
2430 
2431 
2432 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
2433                                                       int runtime_visible_annotations_length,
2434                                                       u1* runtime_invisible_annotations,
2435                                                       int runtime_invisible_annotations_length, TRAPS) {
2436   typeArrayHandle annotations;
2437   if (runtime_visible_annotations != NULL ||
2438       runtime_invisible_annotations != NULL) {
2439     typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length +
2440                                                             runtime_invisible_annotations_length, CHECK_(annotations));
2441     annotations = typeArrayHandle(THREAD, anno);
2442     if (runtime_visible_annotations != NULL) {
2443       memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length);
2444     }
2445     if (runtime_invisible_annotations != NULL) {
2446       memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length);
2447     }
2448   }
2449   return annotations;
2450 }
2451 
2452 
2453 static void initialize_static_field(fieldDescriptor* fd, TRAPS) {
2454   KlassHandle h_k (THREAD, fd->field_holder());
2455   assert(h_k.not_null() && fd->is_static(), "just checking");
2456   if (fd->has_initial_value()) {
2457     BasicType t = fd->field_type();
2458     switch (t) {
2459       case T_BYTE:
2460         h_k()->byte_field_put(fd->offset(), fd->int_initial_value());
2461               break;
2462       case T_BOOLEAN:
2463         h_k()->bool_field_put(fd->offset(), fd->int_initial_value());
2464               break;
2465       case T_CHAR:
2466         h_k()->char_field_put(fd->offset(), fd->int_initial_value());
2467               break;
2468       case T_SHORT:
2469         h_k()->short_field_put(fd->offset(), fd->int_initial_value());
2470               break;
2471       case T_INT:
2472         h_k()->int_field_put(fd->offset(), fd->int_initial_value());
2473         break;
2474       case T_FLOAT:
2475         h_k()->float_field_put(fd->offset(), fd->float_initial_value());
2476         break;
2477       case T_DOUBLE:
2478         h_k()->double_field_put(fd->offset(), fd->double_initial_value());
2479         break;
2480       case T_LONG:
2481         h_k()->long_field_put(fd->offset(), fd->long_initial_value());
2482         break;
2483       case T_OBJECT:
2484         {
2485           #ifdef ASSERT
2486           symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK);
2487           assert(fd->signature() == sym, "just checking");
2488           #endif
2489           oop string = fd->string_initial_value(CHECK);
2490           h_k()->obj_field_put(fd->offset(), string);
2491         }
2492         break;
2493       default:
2494         THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
2495                   "Illegal ConstantValue attribute in class file");
2496     }
2497   }
2498 }
2499 
2500 
2501 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr,
2502   constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) {
2503   // This code is for compatibility with earlier jdk's that do not
2504   // have the "discovered" field in java.lang.ref.Reference.  For 1.5
2505   // the check for the "discovered" field should issue a warning if
2506   // the field is not found.  For 1.6 this code should be issue a
2507   // fatal error if the "discovered" field is not found.
2508   //
2509   // Increment fac.nonstatic_oop_count so that the start of the
2510   // next type of non-static oops leaves room for the fake oop.
2511   // Do not increment next_nonstatic_oop_offset so that the
2512   // fake oop is place after the java.lang.ref.Reference oop
2513   // fields.
2514   //
2515   // Check the fields in java.lang.ref.Reference for the "discovered"
2516   // field.  If it is not present, artifically create a field for it.
2517   // This allows this VM to run on early JDK where the field is not
2518   // present.
2519 
2520   //
2521   // Increment fac.nonstatic_oop_count so that the start of the
2522   // next type of non-static oops leaves room for the fake oop.
2523   // Do not increment next_nonstatic_oop_offset so that the
2524   // fake oop is place after the java.lang.ref.Reference oop
2525   // fields.
2526   //
2527   // Check the fields in java.lang.ref.Reference for the "discovered"
2528   // field.  If it is not present, artifically create a field for it.
2529   // This allows this VM to run on early JDK where the field is not
2530   // present.
2531   int reference_sig_index = 0;
2532   int reference_name_index = 0;
2533   int reference_index = 0;
2534   int extra = java_lang_ref_Reference::number_of_fake_oop_fields;
2535   const int n = (*fields_ptr)()->length();
2536   for (int i = 0; i < n; i += instanceKlass::next_offset ) {
2537     int name_index =
2538     (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset);
2539     int sig_index  =
2540       (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset);
2541     symbolOop f_name = cp->symbol_at(name_index);
2542     symbolOop f_sig  = cp->symbol_at(sig_index);
2543     if (f_sig == vmSymbols::reference_signature() && reference_index == 0) {
2544       // Save the index for reference signature for later use.
2545       // The fake discovered field does not entries in the
2546       // constant pool so the index for its signature cannot
2547       // be extracted from the constant pool.  It will need
2548       // later, however.  It's signature is vmSymbols::reference_signature()
2549       // so same an index for that signature.
2550       reference_sig_index = sig_index;
2551       reference_name_index = name_index;
2552       reference_index = i;
2553     }
2554     if (f_name == vmSymbols::reference_discovered_name() &&
2555       f_sig == vmSymbols::reference_signature()) {
2556       // The values below are fake but will force extra
2557       // non-static oop fields and a corresponding non-static
2558       // oop map block to be allocated.
2559       extra = 0;
2560       break;
2561     }
2562   }
2563   if (extra != 0) {
2564     fac_ptr->nonstatic_oop_count += extra;
2565     // Add the additional entry to "fields" so that the klass
2566     // contains the "discoverd" field and the field will be initialized
2567     // in instances of the object.
2568     int fields_with_fix_length = (*fields_ptr)()->length() +
2569       instanceKlass::next_offset;
2570     typeArrayOop ff = oopFactory::new_permanent_shortArray(
2571                                                 fields_with_fix_length, CHECK);
2572     typeArrayHandle fields_with_fix(THREAD, ff);
2573 
2574     // Take everything from the original but the length.
2575     for (int idx = 0; idx < (*fields_ptr)->length(); idx++) {
2576       fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx));
2577     }
2578 
2579     // Add the fake field at the end.
2580     int i = (*fields_ptr)->length();
2581     // There is no name index for the fake "discovered" field nor
2582     // signature but a signature is needed so that the field will
2583     // be properly initialized.  Use one found for
2584     // one of the other reference fields. Be sure the index for the
2585     // name is 0.  In fieldDescriptor::initialize() the index of the
2586     // name is checked.  That check is by passed for the last nonstatic
2587     // oop field in a java.lang.ref.Reference which is assumed to be
2588     // this artificial "discovered" field.  An assertion checks that
2589     // the name index is 0.
2590     assert(reference_index != 0, "Missing signature for reference");
2591 
2592     int j;
2593     for (j = 0; j < instanceKlass::next_offset; j++) {
2594       fields_with_fix->ushort_at_put(i + j,
2595         (*fields_ptr)->ushort_at(reference_index +j));
2596     }
2597     // Clear the public access flag and set the private access flag.
2598     short flags;
2599     flags =
2600       fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset);
2601     assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set");
2602     flags = flags & (~JVM_ACC_PUBLIC);
2603     flags = flags | JVM_ACC_PRIVATE;
2604     AccessFlags access_flags;
2605     access_flags.set_flags(flags);
2606     assert(!access_flags.is_public(), "Failed to clear public flag");
2607     assert(access_flags.is_private(), "Failed to set private flag");
2608     fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset,
2609       flags);
2610 
2611     assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset)
2612       == reference_name_index, "The fake reference name is incorrect");
2613     assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset)
2614       == reference_sig_index, "The fake reference signature is incorrect");
2615     // The type of the field is stored in the low_offset entry during
2616     // parsing.
2617     assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) ==
2618       NONSTATIC_OOP, "The fake reference type is incorrect");
2619 
2620     // "fields" is allocated in the permanent generation.  Disgard
2621     // it and let it be collected.
2622     (*fields_ptr) = fields_with_fix;
2623   }
2624   return;
2625 }
2626 
2627 
2628 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr,
2629   FieldAllocationCount *fac_ptr, TRAPS) {
2630   // Add fake fields for java.lang.Class instances
2631   //
2632   // This is not particularly nice. We should consider adding a
2633   // private transient object field at the Java level to
2634   // java.lang.Class. Alternatively we could add a subclass of
2635   // instanceKlass which provides an accessor and size computer for
2636   // this field, but that appears to be more code than this hack.
2637   //
2638   // NOTE that we wedge these in at the beginning rather than the
2639   // end of the object because the Class layout changed between JDK
2640   // 1.3 and JDK 1.4 with the new reflection implementation; some
2641   // nonstatic oop fields were added at the Java level. The offsets
2642   // of these fake fields can't change between these two JDK
2643   // versions because when the offsets are computed at bootstrap
2644   // time we don't know yet which version of the JDK we're running in.
2645 
2646   // The values below are fake but will force two non-static oop fields and
2647   // a corresponding non-static oop map block to be allocated.
2648   const int extra = java_lang_Class::number_of_fake_oop_fields;
2649   fac_ptr->nonstatic_oop_count += extra;
2650 }
2651 
2652 
2653 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) {
2654   // Cause the extra fake fields in java.lang.Class to show up before
2655   // the Java fields for layout compatibility between 1.3 and 1.4
2656   // Incrementing next_nonstatic_oop_offset here advances the
2657   // location where the real java fields are placed.
2658   const int extra = java_lang_Class::number_of_fake_oop_fields;
2659   (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize);
2660 }
2661 
2662 
2663 // Force MethodHandle.vmentry to be an unmanaged pointer.
2664 // There is no way for a classfile to express this, so we must help it.
2665 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp,
2666                                                     typeArrayHandle* fields_ptr,
2667                                                     FieldAllocationCount *fac_ptr,
2668                                                     TRAPS) {
2669   // Add fake fields for java.dyn.MethodHandle instances
2670   //
2671   // This is not particularly nice, but since there is no way to express
2672   // a native wordSize field in Java, we must do it at this level.
2673 
2674   if (!EnableMethodHandles)  return;
2675 
2676   int word_sig_index = 0;
2677   const int cp_size = cp->length();
2678   for (int index = 1; index < cp_size; index++) {
2679     if (cp->tag_at(index).is_utf8() &&
2680         cp->symbol_at(index) == vmSymbols::machine_word_signature()) {
2681       word_sig_index = index;
2682       break;
2683     }
2684   }
2685 
2686   if (word_sig_index == 0)
2687     THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2688               "missing I or J signature (for vmentry) in java.dyn.MethodHandle");
2689 
2690   bool found_vmentry = false;
2691 
2692   const int n = (*fields_ptr)()->length();
2693   for (int i = 0; i < n; i += instanceKlass::next_offset) {
2694     int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset);
2695     int sig_index  = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset);
2696     int acc_flags  = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset);
2697     symbolOop f_name = cp->symbol_at(name_index);
2698     symbolOop f_sig  = cp->symbol_at(sig_index);
2699     if (f_sig == vmSymbols::byte_signature() &&
2700         f_name == vmSymbols::vmentry_name() &&
2701         (acc_flags & JVM_ACC_STATIC) == 0) {
2702       // Adjust the field type from byte to an unmanaged pointer.
2703       assert(fac_ptr->nonstatic_byte_count > 0, "");
2704       fac_ptr->nonstatic_byte_count -= 1;
2705       (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset,
2706                                    word_sig_index);
2707       fac_ptr->nonstatic_word_count += 1;
2708 
2709       FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset);
2710       assert(atype == NONSTATIC_BYTE, "");
2711       FieldAllocationType new_atype = NONSTATIC_WORD;
2712       (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype);
2713 
2714       found_vmentry = true;
2715       break;
2716     }
2717   }
2718 
2719   if (!found_vmentry)
2720     THROW_MSG(vmSymbols::java_lang_VirtualMachineError(),
2721               "missing vmentry byte field in java.dyn.MethodHandle");
2722 
2723 }
2724 
2725 
2726 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name,
2727                                                     Handle class_loader,
2728                                                     Handle protection_domain,
2729                                                     KlassHandle host_klass,
2730                                                     GrowableArray<Handle>* cp_patches,
2731                                                     symbolHandle& parsed_name,
2732                                                     bool verify,
2733                                                     TRAPS) {
2734   // So that JVMTI can cache class file in the state before retransformable agents
2735   // have modified it
2736   unsigned char *cached_class_file_bytes = NULL;
2737   jint cached_class_file_length;
2738 
2739   ClassFileStream* cfs = stream();
2740   // Timing
2741   assert(THREAD->is_Java_thread(), "must be a JavaThread");
2742   JavaThread* jt = (JavaThread*) THREAD;
2743 
2744   PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
2745                             ClassLoader::perf_class_parse_selftime(),
2746                             NULL,
2747                             jt->get_thread_stat()->perf_recursion_counts_addr(),
2748                             jt->get_thread_stat()->perf_timers_addr(),
2749                             PerfClassTraceTime::PARSE_CLASS);
2750 
2751   _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false;
2752 
2753   if (JvmtiExport::should_post_class_file_load_hook()) {
2754     unsigned char* ptr = cfs->buffer();
2755     unsigned char* end_ptr = cfs->buffer() + cfs->length();
2756 
2757     JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain,
2758                                            &ptr, &end_ptr,
2759                                            &cached_class_file_bytes,
2760                                            &cached_class_file_length);
2761 
2762     if (ptr != cfs->buffer()) {
2763       // JVMTI agent has modified class file data.
2764       // Set new class file stream using JVMTI agent modified
2765       // class file data.
2766       cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
2767       set_stream(cfs);
2768     }
2769   }
2770 
2771   _host_klass = host_klass;
2772   _cp_patches = cp_patches;
2773 
2774   instanceKlassHandle nullHandle;
2775 
2776   // Figure out whether we can skip format checking (matching classic VM behavior)
2777   _need_verify = Verifier::should_verify_for(class_loader(), verify);
2778 
2779   // Set the verify flag in stream
2780   cfs->set_verify(_need_verify);
2781 
2782   // Save the class file name for easier error message printing.
2783   _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name();
2784 
2785   cfs->guarantee_more(8, CHECK_(nullHandle));  // magic, major, minor
2786   // Magic value
2787   u4 magic = cfs->get_u4_fast();
2788   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
2789                      "Incompatible magic value %u in class file %s",
2790                      magic, CHECK_(nullHandle));
2791 
2792   // Version numbers
2793   u2 minor_version = cfs->get_u2_fast();
2794   u2 major_version = cfs->get_u2_fast();
2795 
2796   // Check version numbers - we check this even with verifier off
2797   if (!is_supported_version(major_version, minor_version)) {
2798     if (name.is_null()) {
2799       Exceptions::fthrow(
2800         THREAD_AND_LOCATION,
2801         vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2802         "Unsupported major.minor version %u.%u",
2803         major_version,
2804         minor_version);
2805     } else {
2806       ResourceMark rm(THREAD);
2807       Exceptions::fthrow(
2808         THREAD_AND_LOCATION,
2809         vmSymbolHandles::java_lang_UnsupportedClassVersionError(),
2810         "%s : Unsupported major.minor version %u.%u",
2811         name->as_C_string(),
2812         major_version,
2813         minor_version);
2814     }
2815     return nullHandle;
2816   }
2817 
2818   _major_version = major_version;
2819   _minor_version = minor_version;
2820 
2821 
2822   // Check if verification needs to be relaxed for this class file
2823   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
2824   _relax_verify = Verifier::relax_verify_for(class_loader());
2825 
2826   // Constant pool
2827   constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
2828   int cp_size = cp->length();
2829 
2830   cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
2831 
2832   // Access flags
2833   AccessFlags access_flags;
2834   jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
2835 
2836   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2837     // Set abstract bit for old class files for backward compatibility
2838     flags |= JVM_ACC_ABSTRACT;
2839   }
2840   verify_legal_class_modifiers(flags, CHECK_(nullHandle));
2841   access_flags.set_flags(flags);
2842 
2843   // This class and superclass
2844   instanceKlassHandle super_klass;
2845   u2 this_class_index = cfs->get_u2_fast();
2846   check_property(
2847     valid_cp_range(this_class_index, cp_size) &&
2848       cp->tag_at(this_class_index).is_unresolved_klass(),
2849     "Invalid this class index %u in constant pool in class file %s",
2850     this_class_index, CHECK_(nullHandle));
2851 
2852   symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index));
2853   assert(class_name.not_null(), "class_name can't be null");
2854 
2855   // It's important to set parsed_name *before* resolving the super class.
2856   // (it's used for cleanup by the caller if parsing fails)
2857   parsed_name = class_name;
2858 
2859   // Update _class_name which could be null previously to be class_name
2860   _class_name = class_name;
2861 
2862   // Don't need to check whether this class name is legal or not.
2863   // It has been checked when constant pool is parsed.
2864   // However, make sure it is not an array type.
2865   if (_need_verify) {
2866     guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
2867                        "Bad class name in class file %s",
2868                        CHECK_(nullHandle));
2869   }
2870 
2871   klassOop preserve_this_klass;   // for storing result across HandleMark
2872 
2873   // release all handles when parsing is done
2874   { HandleMark hm(THREAD);
2875 
2876     // Checks if name in class file matches requested name
2877     if (name.not_null() && class_name() != name()) {
2878       ResourceMark rm(THREAD);
2879       Exceptions::fthrow(
2880         THREAD_AND_LOCATION,
2881         vmSymbolHandles::java_lang_NoClassDefFoundError(),
2882         "%s (wrong name: %s)",
2883         name->as_C_string(),
2884         class_name->as_C_string()
2885       );
2886       return nullHandle;
2887     }
2888 
2889     if (TraceClassLoadingPreorder) {
2890       tty->print("[Loading %s", name()->as_klass_external_name());
2891       if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
2892       tty->print_cr("]");
2893     }
2894 
2895     u2 super_class_index = cfs->get_u2_fast();
2896     if (super_class_index == 0) {
2897       check_property(class_name() == vmSymbols::java_lang_Object(),
2898                      "Invalid superclass index %u in class file %s",
2899                      super_class_index,
2900                      CHECK_(nullHandle));
2901     } else {
2902       check_property(valid_cp_range(super_class_index, cp_size) &&
2903                      is_klass_reference(cp, super_class_index),
2904                      "Invalid superclass index %u in class file %s",
2905                      super_class_index,
2906                      CHECK_(nullHandle));
2907       // The class name should be legal because it is checked when parsing constant pool.
2908       // However, make sure it is not an array type.
2909       bool is_array = false;
2910       if (cp->tag_at(super_class_index).is_klass()) {
2911         super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index));
2912         if (_need_verify)
2913           is_array = super_klass->oop_is_array();
2914       } else if (_need_verify) {
2915         is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
2916       }
2917       if (_need_verify) {
2918         guarantee_property(!is_array,
2919                           "Bad superclass name in class file %s", CHECK_(nullHandle));
2920       }
2921     }
2922 
2923     // Interfaces
2924     u2 itfs_len = cfs->get_u2_fast();
2925     objArrayHandle local_interfaces;
2926     if (itfs_len == 0) {
2927       local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
2928     } else {
2929       local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle));
2930     }
2931 
2932     // Fields (offsets are filled in later)
2933     struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0};
2934     objArrayHandle fields_annotations;
2935     typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle));
2936     // Methods
2937     bool has_final_method = false;
2938     AccessFlags promoted_flags;
2939     promoted_flags.set_flags(0);
2940     // These need to be oop pointers because they are allocated lazily
2941     // inside parse_methods inside a nested HandleMark
2942     objArrayOop methods_annotations_oop = NULL;
2943     objArrayOop methods_parameter_annotations_oop = NULL;
2944     objArrayOop methods_default_annotations_oop = NULL;
2945     objArrayHandle methods = parse_methods(cp, access_flags.is_interface(),
2946                                            &promoted_flags,
2947                                            &has_final_method,
2948                                            &methods_annotations_oop,
2949                                            &methods_parameter_annotations_oop,
2950                                            &methods_default_annotations_oop,
2951                                            CHECK_(nullHandle));
2952 
2953     objArrayHandle methods_annotations(THREAD, methods_annotations_oop);
2954     objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop);
2955     objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop);
2956 
2957     // We check super class after class file is parsed and format is checked
2958     if (super_class_index > 0 && super_klass.is_null()) {
2959       symbolHandle sk (THREAD, cp->klass_name_at(super_class_index));
2960       if (access_flags.is_interface()) {
2961         // Before attempting to resolve the superclass, check for class format
2962         // errors not checked yet.
2963         guarantee_property(sk() == vmSymbols::java_lang_Object(),
2964                            "Interfaces must have java.lang.Object as superclass in class file %s",
2965                            CHECK_(nullHandle));
2966       }
2967       klassOop k = SystemDictionary::resolve_super_or_fail(class_name,
2968                                                            sk,
2969                                                            class_loader,
2970                                                            protection_domain,
2971                                                            true,
2972                                                            CHECK_(nullHandle));
2973 
2974       KlassHandle kh (THREAD, k);
2975       super_klass = instanceKlassHandle(THREAD, kh());
2976       if (LinkWellKnownClasses)  // my super class is well known to me
2977         cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
2978     }
2979     if (super_klass.not_null()) {
2980       if (super_klass->is_interface()) {
2981         ResourceMark rm(THREAD);
2982         Exceptions::fthrow(
2983           THREAD_AND_LOCATION,
2984           vmSymbolHandles::java_lang_IncompatibleClassChangeError(),
2985           "class %s has interface %s as super class",
2986           class_name->as_klass_external_name(),
2987           super_klass->external_name()
2988         );
2989         return nullHandle;
2990       }
2991       // Make sure super class is not final
2992       if (super_klass->is_final()) {
2993         THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
2994       }
2995     }
2996 
2997     // Compute the transitive list of all unique interfaces implemented by this class
2998     objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
2999 
3000     // sort methods
3001     typeArrayHandle method_ordering = sort_methods(methods,
3002                                                    methods_annotations,
3003                                                    methods_parameter_annotations,
3004                                                    methods_default_annotations,
3005                                                    CHECK_(nullHandle));
3006 
3007     // promote flags from parse_methods() to the klass' flags
3008     access_flags.add_promoted_flags(promoted_flags.as_int());
3009 
3010     // Size of Java vtable (in words)
3011     int vtable_size = 0;
3012     int itable_size = 0;
3013     int num_miranda_methods = 0;
3014 
3015     klassVtable::compute_vtable_size_and_num_mirandas(vtable_size,
3016                                                       num_miranda_methods,
3017                                                       super_klass(),
3018                                                       methods(),
3019                                                       access_flags,
3020                                                       class_loader,
3021                                                       class_name,
3022                                                       local_interfaces(),
3023                                                       CHECK_(nullHandle));
3024 
3025     // Size of Java itable (in words)
3026     itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces);
3027 
3028     // Field size and offset computation
3029     int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size();
3030 #ifndef PRODUCT
3031     int orig_nonstatic_field_size = 0;
3032 #endif
3033     int static_field_size = 0;
3034     int next_static_oop_offset;
3035     int next_static_double_offset;
3036     int next_static_word_offset;
3037     int next_static_short_offset;
3038     int next_static_byte_offset;
3039     int next_static_type_offset;
3040     int next_nonstatic_oop_offset;
3041     int next_nonstatic_double_offset;
3042     int next_nonstatic_word_offset;
3043     int next_nonstatic_short_offset;
3044     int next_nonstatic_byte_offset;
3045     int next_nonstatic_type_offset;
3046     int first_nonstatic_oop_offset;
3047     int first_nonstatic_field_offset;
3048     int next_nonstatic_field_offset;
3049 
3050     // Calculate the starting byte offsets
3051     next_static_oop_offset      = (instanceKlass::header_size() +
3052                                   align_object_offset(vtable_size) +
3053                                   align_object_offset(itable_size)) * wordSize;
3054     next_static_double_offset   = next_static_oop_offset +
3055                                   (fac.static_oop_count * heapOopSize);
3056     if ( fac.static_double_count &&
3057          (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3058           Universe::field_type_should_be_aligned(T_LONG)) ) {
3059       next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3060     }
3061 
3062     next_static_word_offset     = next_static_double_offset +
3063                                   (fac.static_double_count * BytesPerLong);
3064     next_static_short_offset    = next_static_word_offset +
3065                                   (fac.static_word_count * BytesPerInt);
3066     next_static_byte_offset     = next_static_short_offset +
3067                                   (fac.static_short_count * BytesPerShort);
3068     next_static_type_offset     = align_size_up((next_static_byte_offset +
3069                                   fac.static_byte_count ), wordSize );
3070     static_field_size           = (next_static_type_offset -
3071                                   next_static_oop_offset) / wordSize;
3072     first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() +
3073                                    nonstatic_field_size * heapOopSize;
3074     next_nonstatic_field_offset = first_nonstatic_field_offset;
3075 
3076     // Add fake fields for java.lang.Class instances (also see below)
3077     if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3078       java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle));
3079     }
3080 
3081     // adjust the vmentry field declaration in java.dyn.MethodHandle
3082     if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) {
3083       java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle));
3084     }
3085 
3086     // Add a fake "discovered" field if it is not present
3087     // for compatibility with earlier jdk's.
3088     if (class_name() == vmSymbols::java_lang_ref_Reference()
3089       && class_loader.is_null()) {
3090       java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle));
3091     }
3092     // end of "discovered" field compactibility fix
3093 
3094     unsigned int nonstatic_double_count = fac.nonstatic_double_count;
3095     unsigned int nonstatic_word_count   = fac.nonstatic_word_count;
3096     unsigned int nonstatic_short_count  = fac.nonstatic_short_count;
3097     unsigned int nonstatic_byte_count   = fac.nonstatic_byte_count;
3098     unsigned int nonstatic_oop_count    = fac.nonstatic_oop_count;
3099 
3100     bool super_has_nonstatic_fields =
3101             (super_klass() != NULL && super_klass->has_nonstatic_fields());
3102     bool has_nonstatic_fields  =  super_has_nonstatic_fields ||
3103             ((nonstatic_double_count + nonstatic_word_count +
3104               nonstatic_short_count + nonstatic_byte_count +
3105               nonstatic_oop_count) != 0);
3106 
3107 
3108     // Prepare list of oops for oop map generation.
3109     int* nonstatic_oop_offsets;
3110     unsigned int* nonstatic_oop_counts;
3111     unsigned int nonstatic_oop_map_count = 0;
3112 
3113     nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3114               THREAD, int, nonstatic_oop_count + 1);
3115     nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
3116               THREAD, unsigned int, nonstatic_oop_count + 1);
3117 
3118     // Add fake fields for java.lang.Class instances (also see above).
3119     // FieldsAllocationStyle and CompactFields values will be reset to default.
3120     if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) {
3121       java_lang_Class_fix_post(&next_nonstatic_field_offset);
3122       nonstatic_oop_offsets[0] = first_nonstatic_field_offset;
3123       const uint fake_oop_count = (next_nonstatic_field_offset -
3124                                    first_nonstatic_field_offset) / heapOopSize;
3125       nonstatic_oop_counts[0] = fake_oop_count;
3126       nonstatic_oop_map_count = 1;
3127       nonstatic_oop_count -= fake_oop_count;
3128       first_nonstatic_oop_offset = first_nonstatic_field_offset;
3129     } else {
3130       first_nonstatic_oop_offset = 0; // will be set for first oop field
3131     }
3132 
3133 #ifndef PRODUCT
3134     if( PrintCompactFieldsSavings ) {
3135       next_nonstatic_double_offset = next_nonstatic_field_offset +
3136                                      (nonstatic_oop_count * heapOopSize);
3137       if ( nonstatic_double_count > 0 ) {
3138         next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong);
3139       }
3140       next_nonstatic_word_offset  = next_nonstatic_double_offset +
3141                                     (nonstatic_double_count * BytesPerLong);
3142       next_nonstatic_short_offset = next_nonstatic_word_offset +
3143                                     (nonstatic_word_count * BytesPerInt);
3144       next_nonstatic_byte_offset  = next_nonstatic_short_offset +
3145                                     (nonstatic_short_count * BytesPerShort);
3146       next_nonstatic_type_offset  = align_size_up((next_nonstatic_byte_offset +
3147                                     nonstatic_byte_count ), heapOopSize );
3148       orig_nonstatic_field_size   = nonstatic_field_size +
3149       ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize);
3150     }
3151 #endif
3152     bool compact_fields   = CompactFields;
3153     int  allocation_style = FieldsAllocationStyle;
3154     if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3155       assert(false, "0 <= FieldsAllocationStyle <= 2");
3156       allocation_style = 1; // Optimistic
3157     }
3158 
3159     // The next classes have predefined hard-coded fields offsets
3160     // (see in JavaClasses::compute_hard_coded_offsets()).
3161     // Use default fields allocation order for them.
3162     if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3163         (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() ||
3164          class_name() == vmSymbols::java_lang_Class() ||
3165          class_name() == vmSymbols::java_lang_ClassLoader() ||
3166          class_name() == vmSymbols::java_lang_ref_Reference() ||
3167          class_name() == vmSymbols::java_lang_ref_SoftReference() ||
3168          class_name() == vmSymbols::java_lang_StackTraceElement() ||
3169          class_name() == vmSymbols::java_lang_String() ||
3170          class_name() == vmSymbols::java_lang_Throwable() ||
3171          class_name() == vmSymbols::java_lang_Boolean() ||
3172          class_name() == vmSymbols::java_lang_Character() ||
3173          class_name() == vmSymbols::java_lang_Float() ||
3174          class_name() == vmSymbols::java_lang_Double() ||
3175          class_name() == vmSymbols::java_lang_Byte() ||
3176          class_name() == vmSymbols::java_lang_Short() ||
3177          class_name() == vmSymbols::java_lang_Integer() ||
3178          class_name() == vmSymbols::java_lang_Long())) {
3179       allocation_style = 0;     // Allocate oops first
3180       compact_fields   = false; // Don't compact fields
3181     }
3182 
3183     if( allocation_style == 0 ) {
3184       // Fields order: oops, longs/doubles, ints, shorts/chars, bytes
3185       next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3186       next_nonstatic_double_offset = next_nonstatic_oop_offset +
3187                                       (nonstatic_oop_count * heapOopSize);
3188     } else if( allocation_style == 1 ) {
3189       // Fields order: longs/doubles, ints, shorts/chars, bytes, oops
3190       next_nonstatic_double_offset = next_nonstatic_field_offset;
3191     } else if( allocation_style == 2 ) {
3192       // Fields allocation: oops fields in super and sub classes are together.
3193       if( nonstatic_field_size > 0 && super_klass() != NULL &&
3194           super_klass->nonstatic_oop_map_size() > 0 ) {
3195         int map_size = super_klass->nonstatic_oop_map_size();
3196         OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps();
3197         OopMapBlock* last_map = first_map + map_size - 1;
3198         int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3199         if (next_offset == next_nonstatic_field_offset) {
3200           allocation_style = 0;   // allocate oops first
3201           next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3202           next_nonstatic_double_offset = next_nonstatic_oop_offset +
3203                                          (nonstatic_oop_count * heapOopSize);
3204         }
3205       }
3206       if( allocation_style == 2 ) {
3207         allocation_style = 1;     // allocate oops last
3208         next_nonstatic_double_offset = next_nonstatic_field_offset;
3209       }
3210     } else {
3211       ShouldNotReachHere();
3212     }
3213 
3214     int nonstatic_oop_space_count   = 0;
3215     int nonstatic_word_space_count  = 0;
3216     int nonstatic_short_space_count = 0;
3217     int nonstatic_byte_space_count  = 0;
3218     int nonstatic_oop_space_offset;
3219     int nonstatic_word_space_offset;
3220     int nonstatic_short_space_offset;
3221     int nonstatic_byte_space_offset;
3222 
3223     if( nonstatic_double_count > 0 ) {
3224       int offset = next_nonstatic_double_offset;
3225       next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3226       if( compact_fields && offset != next_nonstatic_double_offset ) {
3227         // Allocate available fields into the gap before double field.
3228         int length = next_nonstatic_double_offset - offset;
3229         assert(length == BytesPerInt, "");
3230         nonstatic_word_space_offset = offset;
3231         if( nonstatic_word_count > 0 ) {
3232           nonstatic_word_count      -= 1;
3233           nonstatic_word_space_count = 1; // Only one will fit
3234           length -= BytesPerInt;
3235           offset += BytesPerInt;
3236         }
3237         nonstatic_short_space_offset = offset;
3238         while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3239           nonstatic_short_count       -= 1;
3240           nonstatic_short_space_count += 1;
3241           length -= BytesPerShort;
3242           offset += BytesPerShort;
3243         }
3244         nonstatic_byte_space_offset = offset;
3245         while( length > 0 && nonstatic_byte_count > 0 ) {
3246           nonstatic_byte_count       -= 1;
3247           nonstatic_byte_space_count += 1;
3248           length -= 1;
3249         }
3250         // Allocate oop field in the gap if there are no other fields for that.
3251         nonstatic_oop_space_offset = offset;
3252         if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3253             allocation_style != 0 ) { // when oop fields not first
3254           nonstatic_oop_count      -= 1;
3255           nonstatic_oop_space_count = 1; // Only one will fit
3256           length -= heapOopSize;
3257           offset += heapOopSize;
3258         }
3259       }
3260     }
3261 
3262     next_nonstatic_word_offset  = next_nonstatic_double_offset +
3263                                   (nonstatic_double_count * BytesPerLong);
3264     next_nonstatic_short_offset = next_nonstatic_word_offset +
3265                                   (nonstatic_word_count * BytesPerInt);
3266     next_nonstatic_byte_offset  = next_nonstatic_short_offset +
3267                                   (nonstatic_short_count * BytesPerShort);
3268 
3269     int notaligned_offset;
3270     if( allocation_style == 0 ) {
3271       notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3272     } else { // allocation_style == 1
3273       next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count;
3274       if( nonstatic_oop_count > 0 ) {
3275         next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3276       }
3277       notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3278     }
3279     next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize );
3280     nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset
3281                                    - first_nonstatic_field_offset)/heapOopSize);
3282 
3283     // Iterate over fields again and compute correct offsets.
3284     // The field allocation type was temporarily stored in the offset slot.
3285     // oop fields are located before non-oop fields (static and non-static).
3286     int len = fields->length();
3287     for (int i = 0; i < len; i += instanceKlass::next_offset) {
3288       int real_offset;
3289       FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset);
3290       switch (atype) {
3291         case STATIC_OOP:
3292           real_offset = next_static_oop_offset;
3293           next_static_oop_offset += heapOopSize;
3294           break;
3295         case STATIC_BYTE:
3296           real_offset = next_static_byte_offset;
3297           next_static_byte_offset += 1;
3298           break;
3299         case STATIC_SHORT:
3300           real_offset = next_static_short_offset;
3301           next_static_short_offset += BytesPerShort;
3302           break;
3303         case STATIC_WORD:
3304           real_offset = next_static_word_offset;
3305           next_static_word_offset += BytesPerInt;
3306           break;
3307         case STATIC_ALIGNED_DOUBLE:
3308         case STATIC_DOUBLE:
3309           real_offset = next_static_double_offset;
3310           next_static_double_offset += BytesPerLong;
3311           break;
3312         case NONSTATIC_OOP:
3313           if( nonstatic_oop_space_count > 0 ) {
3314             real_offset = nonstatic_oop_space_offset;
3315             nonstatic_oop_space_offset += heapOopSize;
3316             nonstatic_oop_space_count  -= 1;
3317           } else {
3318             real_offset = next_nonstatic_oop_offset;
3319             next_nonstatic_oop_offset += heapOopSize;
3320           }
3321           // Update oop maps
3322           if( nonstatic_oop_map_count > 0 &&
3323               nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3324               real_offset -
3325               int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3326               heapOopSize ) {
3327             // Extend current oop map
3328             nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3329           } else {
3330             // Create new oop map
3331             nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3332             nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3333             nonstatic_oop_map_count += 1;
3334             if( first_nonstatic_oop_offset == 0 ) { // Undefined
3335               first_nonstatic_oop_offset = real_offset;
3336             }
3337           }
3338           break;
3339         case NONSTATIC_BYTE:
3340           if( nonstatic_byte_space_count > 0 ) {
3341             real_offset = nonstatic_byte_space_offset;
3342             nonstatic_byte_space_offset += 1;
3343             nonstatic_byte_space_count  -= 1;
3344           } else {
3345             real_offset = next_nonstatic_byte_offset;
3346             next_nonstatic_byte_offset += 1;
3347           }
3348           break;
3349         case NONSTATIC_SHORT:
3350           if( nonstatic_short_space_count > 0 ) {
3351             real_offset = nonstatic_short_space_offset;
3352             nonstatic_short_space_offset += BytesPerShort;
3353             nonstatic_short_space_count  -= 1;
3354           } else {
3355             real_offset = next_nonstatic_short_offset;
3356             next_nonstatic_short_offset += BytesPerShort;
3357           }
3358           break;
3359         case NONSTATIC_WORD:
3360           if( nonstatic_word_space_count > 0 ) {
3361             real_offset = nonstatic_word_space_offset;
3362             nonstatic_word_space_offset += BytesPerInt;
3363             nonstatic_word_space_count  -= 1;
3364           } else {
3365             real_offset = next_nonstatic_word_offset;
3366             next_nonstatic_word_offset += BytesPerInt;
3367           }
3368           break;
3369         case NONSTATIC_ALIGNED_DOUBLE:
3370         case NONSTATIC_DOUBLE:
3371           real_offset = next_nonstatic_double_offset;
3372           next_nonstatic_double_offset += BytesPerLong;
3373           break;
3374         default:
3375           ShouldNotReachHere();
3376       }
3377       fields->short_at_put(i + instanceKlass::low_offset,  extract_low_short_from_int(real_offset));
3378       fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset));
3379     }
3380 
3381     // Size of instances
3382     int instance_size;
3383 
3384     next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize );
3385     instance_size = align_object_size(next_nonstatic_type_offset / wordSize);
3386 
3387     assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value");
3388 
3389     // Number of non-static oop map blocks allocated at end of klass.
3390     const unsigned int total_oop_map_count =
3391       compute_oop_map_count(super_klass, nonstatic_oop_map_count,
3392                             first_nonstatic_oop_offset);
3393 
3394     // Compute reference type
3395     ReferenceType rt;
3396     if (super_klass() == NULL) {
3397       rt = REF_NONE;
3398     } else {
3399       rt = super_klass->reference_type();
3400     }
3401 
3402     // We can now create the basic klassOop for this klass
3403     klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size,
3404                                                 static_field_size,
3405                                                 total_oop_map_count,
3406                                                 rt, CHECK_(nullHandle));
3407     instanceKlassHandle this_klass (THREAD, ik);
3408 
3409     assert(this_klass->static_field_size() == static_field_size, "sanity");
3410     assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count,
3411            "sanity");
3412 
3413     // Fill in information already parsed
3414     this_klass->set_access_flags(access_flags);
3415     this_klass->set_should_verify_class(verify);
3416     jint lh = Klass::instance_layout_helper(instance_size, false);
3417     this_klass->set_layout_helper(lh);
3418     assert(this_klass->oop_is_instance(), "layout is correct");
3419     assert(this_klass->size_helper() == instance_size, "correct size_helper");
3420     // Not yet: supers are done below to support the new subtype-checking fields
3421     //this_klass->set_super(super_klass());
3422     this_klass->set_class_loader(class_loader());
3423     this_klass->set_nonstatic_field_size(nonstatic_field_size);
3424     this_klass->set_has_nonstatic_fields(has_nonstatic_fields);
3425     this_klass->set_static_oop_field_size(fac.static_oop_count);
3426     cp->set_pool_holder(this_klass());
3427     this_klass->set_constants(cp());
3428     this_klass->set_local_interfaces(local_interfaces());
3429     this_klass->set_fields(fields());
3430     this_klass->set_methods(methods());
3431     if (has_final_method) {
3432       this_klass->set_has_final_method();
3433     }
3434     this_klass->set_method_ordering(method_ordering());
3435     // The instanceKlass::_methods_jmethod_ids cache and the
3436     // instanceKlass::_methods_cached_itable_indices cache are
3437     // both managed on the assumption that the initial cache
3438     // size is equal to the number of methods in the class. If
3439     // that changes, then instanceKlass::idnum_can_increment()
3440     // has to be changed accordingly.
3441     this_klass->set_initial_method_idnum(methods->length());
3442     this_klass->set_name(cp->klass_name_at(this_class_index));
3443     if (LinkWellKnownClasses || is_anonymous())  // I am well known to myself
3444       cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3445     this_klass->set_protection_domain(protection_domain());
3446     this_klass->set_fields_annotations(fields_annotations());
3447     this_klass->set_methods_annotations(methods_annotations());
3448     this_klass->set_methods_parameter_annotations(methods_parameter_annotations());
3449     this_klass->set_methods_default_annotations(methods_default_annotations());
3450 
3451     this_klass->set_minor_version(minor_version);
3452     this_klass->set_major_version(major_version);
3453 
3454     // Set up methodOop::intrinsic_id as soon as we know the names of methods.
3455     // (We used to do this lazily, but now we query it in Rewriter,
3456     // which is eagerly done for every method, so we might as well do it now,
3457     // when everything is fresh in memory.)
3458     if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) {
3459       for (int j = 0; j < methods->length(); j++) {
3460         ((methodOop)methods->obj_at(j))->init_intrinsic_id();
3461       }
3462     }
3463 
3464     if (cached_class_file_bytes != NULL) {
3465       // JVMTI: we have an instanceKlass now, tell it about the cached bytes
3466       this_klass->set_cached_class_file(cached_class_file_bytes,
3467                                         cached_class_file_length);
3468     }
3469 
3470     // Miranda methods
3471     if ((num_miranda_methods > 0) ||
3472         // if this class introduced new miranda methods or
3473         (super_klass.not_null() && (super_klass->has_miranda_methods()))
3474         // super class exists and this class inherited miranda methods
3475         ) {
3476       this_klass->set_has_miranda_methods(); // then set a flag
3477     }
3478 
3479     // Additional attributes
3480     parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle));
3481 
3482     // Make sure this is the end of class file stream
3483     guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3484 
3485     // Initialize static fields
3486     this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle));
3487 
3488     // VerifyOops believes that once this has been set, the object is completely loaded.
3489     // Compute transitive closure of interfaces this class implements
3490     this_klass->set_transitive_interfaces(transitive_interfaces());
3491 
3492     // Fill in information needed to compute superclasses.
3493     this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
3494 
3495     // Initialize itable offset tables
3496     klassItable::setup_itable_offset_table(this_klass);
3497 
3498     // Do final class setup
3499     fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts);
3500 
3501     set_precomputed_flags(this_klass);
3502 
3503     // reinitialize modifiers, using the InnerClasses attribute
3504     int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
3505     this_klass->set_modifier_flags(computed_modifiers);
3506 
3507     // check if this class can access its super class
3508     check_super_class_access(this_klass, CHECK_(nullHandle));
3509 
3510     // check if this class can access its superinterfaces
3511     check_super_interface_access(this_klass, CHECK_(nullHandle));
3512 
3513     // check if this class overrides any final method
3514     check_final_method_override(this_klass, CHECK_(nullHandle));
3515 
3516     // check that if this class is an interface then it doesn't have static methods
3517     if (this_klass->is_interface()) {
3518       check_illegal_static_method(this_klass, CHECK_(nullHandle));
3519     }
3520 
3521     ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()),
3522                                              false /* not shared class */);
3523 
3524     if (TraceClassLoading) {
3525       // print in a single call to reduce interleaving of output
3526       if (cfs->source() != NULL) {
3527         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3528                    cfs->source());
3529       } else if (class_loader.is_null()) {
3530         if (THREAD->is_Java_thread()) {
3531           klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
3532           tty->print("[Loaded %s by instance of %s]\n",
3533                      this_klass->external_name(),
3534                      instanceKlass::cast(caller)->external_name());
3535         } else {
3536           tty->print("[Loaded %s]\n", this_klass->external_name());
3537         }
3538       } else {
3539         ResourceMark rm;
3540         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
3541                    instanceKlass::cast(class_loader->klass())->external_name());
3542       }
3543     }
3544 
3545     if (TraceClassResolution) {
3546       // print out the superclass.
3547       const char * from = Klass::cast(this_klass())->external_name();
3548       if (this_klass->java_super() != NULL) {
3549         tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name());
3550       }
3551       // print out each of the interface classes referred to by this class.
3552       objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces());
3553       if (!local_interfaces.is_null()) {
3554         int length = local_interfaces->length();
3555         for (int i = 0; i < length; i++) {
3556           klassOop k = klassOop(local_interfaces->obj_at(i));
3557           instanceKlass* to_class = instanceKlass::cast(k);
3558           const char * to = to_class->external_name();
3559           tty->print("RESOLVE %s %s (interface)\n", from, to);
3560         }
3561       }
3562     }
3563 
3564 #ifndef PRODUCT
3565     if( PrintCompactFieldsSavings ) {
3566       if( nonstatic_field_size < orig_nonstatic_field_size ) {
3567         tty->print("[Saved %d of %d bytes in %s]\n",
3568                  (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize,
3569                  orig_nonstatic_field_size*heapOopSize,
3570                  this_klass->external_name());
3571       } else if( nonstatic_field_size > orig_nonstatic_field_size ) {
3572         tty->print("[Wasted %d over %d bytes in %s]\n",
3573                  (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize,
3574                  orig_nonstatic_field_size*heapOopSize,
3575                  this_klass->external_name());
3576       }
3577     }
3578 #endif
3579 
3580     // preserve result across HandleMark
3581     preserve_this_klass = this_klass();
3582   }
3583 
3584   // Create new handle outside HandleMark
3585   instanceKlassHandle this_klass (THREAD, preserve_this_klass);
3586   debug_only(this_klass->as_klassOop()->verify();)
3587 
3588   return this_klass;
3589 }
3590 
3591 
3592 unsigned int
3593 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
3594                                        unsigned int nonstatic_oop_map_count,
3595                                        int first_nonstatic_oop_offset) {
3596   unsigned int map_count =
3597     super.is_null() ? 0 : super->nonstatic_oop_map_count();
3598   if (nonstatic_oop_map_count > 0) {
3599     // We have oops to add to map
3600     if (map_count == 0) {
3601       map_count = nonstatic_oop_map_count;
3602     } else {
3603       // Check whether we should add a new map block or whether the last one can
3604       // be extended
3605       OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3606       OopMapBlock* const last_map = first_map + map_count - 1;
3607 
3608       int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3609       if (next_offset == first_nonstatic_oop_offset) {
3610         // There is no gap bettwen superklass's last oop field and first
3611         // local oop field, merge maps.
3612         nonstatic_oop_map_count -= 1;
3613       } else {
3614         // Superklass didn't end with a oop field, add extra maps
3615         assert(next_offset < first_nonstatic_oop_offset, "just checking");
3616       }
3617       map_count += nonstatic_oop_map_count;
3618     }
3619   }
3620   return map_count;
3621 }
3622 
3623 
3624 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
3625                                     unsigned int nonstatic_oop_map_count,
3626                                     int* nonstatic_oop_offsets,
3627                                     unsigned int* nonstatic_oop_counts) {
3628   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
3629   const instanceKlass* const super = k->superklass();
3630   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
3631   if (super_count > 0) {
3632     // Copy maps from superklass
3633     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
3634     for (unsigned int i = 0; i < super_count; ++i) {
3635       *this_oop_map++ = *super_oop_map++;
3636     }
3637   }
3638 
3639   if (nonstatic_oop_map_count > 0) {
3640     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
3641       // The counts differ because there is no gap between superklass's last oop
3642       // field and the first local oop field.  Extend the last oop map copied
3643       // from the superklass instead of creating new one.
3644       nonstatic_oop_map_count--;
3645       nonstatic_oop_offsets++;
3646       this_oop_map--;
3647       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
3648       this_oop_map++;
3649     }
3650 
3651     // Add new map blocks, fill them
3652     while (nonstatic_oop_map_count-- > 0) {
3653       this_oop_map->set_offset(*nonstatic_oop_offsets++);
3654       this_oop_map->set_count(*nonstatic_oop_counts++);
3655       this_oop_map++;
3656     }
3657     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
3658            this_oop_map, "sanity");
3659   }
3660 }
3661 
3662 
3663 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
3664   klassOop super = k->super();
3665 
3666   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
3667   // in which case we don't have to register objects as finalizable
3668   if (!_has_empty_finalizer) {
3669     if (_has_finalizer ||
3670         (super != NULL && super->klass_part()->has_finalizer())) {
3671       k->set_has_finalizer();
3672     }
3673   }
3674 
3675 #ifdef ASSERT
3676   bool f = false;
3677   methodOop m = k->lookup_method(vmSymbols::finalize_method_name(),
3678                                  vmSymbols::void_method_signature());
3679   if (m != NULL && !m->is_empty_method()) {
3680     f = true;
3681   }
3682   assert(f == k->has_finalizer(), "inconsistent has_finalizer");
3683 #endif
3684 
3685   // Check if this klass supports the java.lang.Cloneable interface
3686   if (SystemDictionary::Cloneable_klass_loaded()) {
3687     if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
3688       k->set_is_cloneable();
3689     }
3690   }
3691 
3692   // Check if this klass has a vanilla default constructor
3693   if (super == NULL) {
3694     // java.lang.Object has empty default constructor
3695     k->set_has_vanilla_constructor();
3696   } else {
3697     if (Klass::cast(super)->has_vanilla_constructor() &&
3698         _has_vanilla_constructor) {
3699       k->set_has_vanilla_constructor();
3700     }
3701 #ifdef ASSERT
3702     bool v = false;
3703     if (Klass::cast(super)->has_vanilla_constructor()) {
3704       methodOop constructor = k->find_method(vmSymbols::object_initializer_name(
3705 ), vmSymbols::void_method_signature());
3706       if (constructor != NULL && constructor->is_vanilla_constructor()) {
3707         v = true;
3708       }
3709     }
3710     assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
3711 #endif
3712   }
3713 
3714   // If it cannot be fast-path allocated, set a bit in the layout helper.
3715   // See documentation of instanceKlass::can_be_fastpath_allocated().
3716   assert(k->size_helper() > 0, "layout_helper is initialized");
3717   if ((!RegisterFinalizersAtInit && k->has_finalizer())
3718       || k->is_abstract() || k->is_interface()
3719       || (k->name() == vmSymbols::java_lang_Class()
3720           && k->class_loader() == NULL)
3721       || k->size_helper() >= FastAllocateSizeLimit) {
3722     // Forbid fast-path allocation.
3723     jint lh = Klass::instance_layout_helper(k->size_helper(), true);
3724     k->set_layout_helper(lh);
3725   }
3726 }
3727 
3728 
3729 // utility method for appending and array with check for duplicates
3730 
3731 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) {
3732   // iterate over new interfaces
3733   for (int i = 0; i < ifs->length(); i++) {
3734     oop e = ifs->obj_at(i);
3735     assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking");
3736     // check for duplicates
3737     bool duplicate = false;
3738     for (int j = 0; j < index; j++) {
3739       if (result->obj_at(j) == e) {
3740         duplicate = true;
3741         break;
3742       }
3743     }
3744     // add new interface
3745     if (!duplicate) {
3746       result->obj_at_put(index++, e);
3747     }
3748   }
3749 }
3750 
3751 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) {
3752   // Compute maximum size for transitive interfaces
3753   int max_transitive_size = 0;
3754   int super_size = 0;
3755   // Add superclass transitive interfaces size
3756   if (super.not_null()) {
3757     super_size = super->transitive_interfaces()->length();
3758     max_transitive_size += super_size;
3759   }
3760   // Add local interfaces' super interfaces
3761   int local_size = local_ifs->length();
3762   for (int i = 0; i < local_size; i++) {
3763     klassOop l = klassOop(local_ifs->obj_at(i));
3764     max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length();
3765   }
3766   // Finally add local interfaces
3767   max_transitive_size += local_size;
3768   // Construct array
3769   objArrayHandle result;
3770   if (max_transitive_size == 0) {
3771     // no interfaces, use canonicalized array
3772     result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array());
3773   } else if (max_transitive_size == super_size) {
3774     // no new local interfaces added, share superklass' transitive interface array
3775     result = objArrayHandle(THREAD, super->transitive_interfaces());
3776   } else if (max_transitive_size == local_size) {
3777     // only local interfaces added, share local interface array
3778     result = local_ifs;
3779   } else {
3780     objArrayHandle nullHandle;
3781     objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle));
3782     result = objArrayHandle(THREAD, new_objarray);
3783     int index = 0;
3784     // Copy down from superclass
3785     if (super.not_null()) {
3786       append_interfaces(result, index, super->transitive_interfaces());
3787     }
3788     // Copy down from local interfaces' superinterfaces
3789     for (int i = 0; i < local_ifs->length(); i++) {
3790       klassOop l = klassOop(local_ifs->obj_at(i));
3791       append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces());
3792     }
3793     // Finally add local interfaces
3794     append_interfaces(result, index, local_ifs());
3795 
3796     // Check if duplicates were removed
3797     if (index != max_transitive_size) {
3798       assert(index < max_transitive_size, "just checking");
3799       objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle));
3800       for (int i = 0; i < index; i++) {
3801         oop e = result->obj_at(i);
3802         assert(e != NULL, "just checking");
3803         new_result->obj_at_put(i, e);
3804       }
3805       result = objArrayHandle(THREAD, new_result);
3806     }
3807   }
3808   return result;
3809 }
3810 
3811 
3812 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
3813   klassOop super = this_klass->super();
3814   if ((super != NULL) &&
3815       (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) {
3816     ResourceMark rm(THREAD);
3817     Exceptions::fthrow(
3818       THREAD_AND_LOCATION,
3819       vmSymbolHandles::java_lang_IllegalAccessError(),
3820       "class %s cannot access its superclass %s",
3821       this_klass->external_name(),
3822       instanceKlass::cast(super)->external_name()
3823     );
3824     return;
3825   }
3826 }
3827 
3828 
3829 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
3830   objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces());
3831   int lng = local_interfaces->length();
3832   for (int i = lng - 1; i >= 0; i--) {
3833     klassOop k = klassOop(local_interfaces->obj_at(i));
3834     assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface");
3835     if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) {
3836       ResourceMark rm(THREAD);
3837       Exceptions::fthrow(
3838         THREAD_AND_LOCATION,
3839         vmSymbolHandles::java_lang_IllegalAccessError(),
3840         "class %s cannot access its superinterface %s",
3841         this_klass->external_name(),
3842         instanceKlass::cast(k)->external_name()
3843       );
3844       return;
3845     }
3846   }
3847 }
3848 
3849 
3850 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
3851   objArrayHandle methods (THREAD, this_klass->methods());
3852   int num_methods = methods->length();
3853 
3854   // go thru each method and check if it overrides a final method
3855   for (int index = 0; index < num_methods; index++) {
3856     methodOop m = (methodOop)methods->obj_at(index);
3857 
3858     // skip private, static and <init> methods
3859     if ((!m->is_private()) &&
3860         (!m->is_static()) &&
3861         (m->name() != vmSymbols::object_initializer_name())) {
3862 
3863       symbolOop name = m->name();
3864       symbolOop signature = m->signature();
3865       klassOop k = this_klass->super();
3866       methodOop super_m = NULL;
3867       while (k != NULL) {
3868         // skip supers that don't have final methods.
3869         if (k->klass_part()->has_final_method()) {
3870           // lookup a matching method in the super class hierarchy
3871           super_m = instanceKlass::cast(k)->lookup_method(name, signature);
3872           if (super_m == NULL) {
3873             break; // didn't find any match; get out
3874           }
3875 
3876           if (super_m->is_final() &&
3877               // matching method in super is final
3878               (Reflection::verify_field_access(this_klass->as_klassOop(),
3879                                                super_m->method_holder(),
3880                                                super_m->method_holder(),
3881                                                super_m->access_flags(), false))
3882             // this class can access super final method and therefore override
3883             ) {
3884             ResourceMark rm(THREAD);
3885             Exceptions::fthrow(
3886               THREAD_AND_LOCATION,
3887               vmSymbolHandles::java_lang_VerifyError(),
3888               "class %s overrides final method %s.%s",
3889               this_klass->external_name(),
3890               name->as_C_string(),
3891               signature->as_C_string()
3892             );
3893             return;
3894           }
3895 
3896           // continue to look from super_m's holder's super.
3897           k = instanceKlass::cast(super_m->method_holder())->super();
3898           continue;
3899         }
3900 
3901         k = k->klass_part()->super();
3902       }
3903     }
3904   }
3905 }
3906 
3907 
3908 // assumes that this_klass is an interface
3909 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
3910   assert(this_klass->is_interface(), "not an interface");
3911   objArrayHandle methods (THREAD, this_klass->methods());
3912   int num_methods = methods->length();
3913 
3914   for (int index = 0; index < num_methods; index++) {
3915     methodOop m = (methodOop)methods->obj_at(index);
3916     // if m is static and not the init method, throw a verify error
3917     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
3918       ResourceMark rm(THREAD);
3919       Exceptions::fthrow(
3920         THREAD_AND_LOCATION,
3921         vmSymbolHandles::java_lang_VerifyError(),
3922         "Illegal static method %s in interface %s",
3923         m->name()->as_C_string(),
3924         this_klass->external_name()
3925       );
3926       return;
3927     }
3928   }
3929 }
3930 
3931 // utility methods for format checking
3932 
3933 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
3934   if (!_need_verify) { return; }
3935 
3936   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
3937   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
3938   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
3939   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
3940   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
3941   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
3942   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
3943 
3944   if ((is_abstract && is_final) ||
3945       (is_interface && !is_abstract) ||
3946       (is_interface && major_gte_15 && (is_super || is_enum)) ||
3947       (!is_interface && major_gte_15 && is_annotation)) {
3948     ResourceMark rm(THREAD);
3949     Exceptions::fthrow(
3950       THREAD_AND_LOCATION,
3951       vmSymbolHandles::java_lang_ClassFormatError(),
3952       "Illegal class modifiers in class %s: 0x%X",
3953       _class_name->as_C_string(), flags
3954     );
3955     return;
3956   }
3957 }
3958 
3959 bool ClassFileParser::has_illegal_visibility(jint flags) {
3960   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
3961   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3962   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
3963 
3964   return ((is_public && is_protected) ||
3965           (is_public && is_private) ||
3966           (is_protected && is_private));
3967 }
3968 
3969 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
3970   u2 max_version =
3971     JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
3972     (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
3973   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
3974          (major <= max_version) &&
3975          ((major != max_version) ||
3976           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
3977 }
3978 
3979 void ClassFileParser::verify_legal_field_modifiers(
3980     jint flags, bool is_interface, TRAPS) {
3981   if (!_need_verify) { return; }
3982 
3983   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
3984   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
3985   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
3986   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
3987   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
3988   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
3989   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
3990   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
3991   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
3992 
3993   bool is_illegal = false;
3994 
3995   if (is_interface) {
3996     if (!is_public || !is_static || !is_final || is_private ||
3997         is_protected || is_volatile || is_transient ||
3998         (major_gte_15 && is_enum)) {
3999       is_illegal = true;
4000     }
4001   } else { // not interface
4002     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4003       is_illegal = true;
4004     }
4005   }
4006 
4007   if (is_illegal) {
4008     ResourceMark rm(THREAD);
4009     Exceptions::fthrow(
4010       THREAD_AND_LOCATION,
4011       vmSymbolHandles::java_lang_ClassFormatError(),
4012       "Illegal field modifiers in class %s: 0x%X",
4013       _class_name->as_C_string(), flags);
4014     return;
4015   }
4016 }
4017 
4018 void ClassFileParser::verify_legal_method_modifiers(
4019     jint flags, bool is_interface, symbolHandle name, TRAPS) {
4020   if (!_need_verify) { return; }
4021 
4022   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4023   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4024   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4025   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4026   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4027   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4028   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4029   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4030   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4031   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
4032   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4033 
4034   bool is_illegal = false;
4035 
4036   if (is_interface) {
4037     if (!is_abstract || !is_public || is_static || is_final ||
4038         is_native || (major_gte_15 && (is_synchronized || is_strict))) {
4039       is_illegal = true;
4040     }
4041   } else { // not interface
4042     if (is_initializer) {
4043       if (is_static || is_final || is_synchronized || is_native ||
4044           is_abstract || (major_gte_15 && is_bridge)) {
4045         is_illegal = true;
4046       }
4047     } else { // not initializer
4048       if (is_abstract) {
4049         if ((is_final || is_native || is_private || is_static ||
4050             (major_gte_15 && (is_synchronized || is_strict)))) {
4051           is_illegal = true;
4052         }
4053       }
4054       if (has_illegal_visibility(flags)) {
4055         is_illegal = true;
4056       }
4057     }
4058   }
4059 
4060   if (is_illegal) {
4061     ResourceMark rm(THREAD);
4062     Exceptions::fthrow(
4063       THREAD_AND_LOCATION,
4064       vmSymbolHandles::java_lang_ClassFormatError(),
4065       "Method %s in class %s has illegal modifiers: 0x%X",
4066       name->as_C_string(), _class_name->as_C_string(), flags);
4067     return;
4068   }
4069 }
4070 
4071 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4072   assert(_need_verify, "only called when _need_verify is true");
4073   int i = 0;
4074   int count = length >> 2;
4075   for (int k=0; k<count; k++) {
4076     unsigned char b0 = buffer[i];
4077     unsigned char b1 = buffer[i+1];
4078     unsigned char b2 = buffer[i+2];
4079     unsigned char b3 = buffer[i+3];
4080     // For an unsigned char v,
4081     // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4082     // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4083     unsigned char res = b0 | b0 - 1 |
4084                         b1 | b1 - 1 |
4085                         b2 | b2 - 1 |
4086                         b3 | b3 - 1;
4087     if (res >= 128) break;
4088     i += 4;
4089   }
4090   for(; i < length; i++) {
4091     unsigned short c;
4092     // no embedded zeros
4093     guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4094     if(buffer[i] < 128) {
4095       continue;
4096     }
4097     if ((i + 5) < length) { // see if it's legal supplementary character
4098       if (UTF8::is_supplementary_character(&buffer[i])) {
4099         c = UTF8::get_supplementary_character(&buffer[i]);
4100         i += 5;
4101         continue;
4102       }
4103     }
4104     switch (buffer[i] >> 4) {
4105       default: break;
4106       case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4107         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4108       case 0xC: case 0xD:  // 110xxxxx  10xxxxxx
4109         c = (buffer[i] & 0x1F) << 6;
4110         i++;
4111         if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4112           c += buffer[i] & 0x3F;
4113           if (_major_version <= 47 || c == 0 || c >= 0x80) {
4114             // for classes with major > 47, c must a null or a character in its shortest form
4115             break;
4116           }
4117         }
4118         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4119       case 0xE:  // 1110xxxx 10xxxxxx 10xxxxxx
4120         c = (buffer[i] & 0xF) << 12;
4121         i += 2;
4122         if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4123           c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4124           if (_major_version <= 47 || c >= 0x800) {
4125             // for classes with major > 47, c must be in its shortest form
4126             break;
4127           }
4128         }
4129         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4130     }  // end of switch
4131   } // end of for
4132 }
4133 
4134 // Checks if name is a legal class name.
4135 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) {
4136   if (!_need_verify || _relax_verify) { return; }
4137 
4138   char buf[fixed_buffer_size];
4139   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4140   unsigned int length = name->utf8_length();
4141   bool legal = false;
4142 
4143   if (length > 0) {
4144     char* p;
4145     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4146       p = skip_over_field_signature(bytes, false, length, CHECK);
4147       legal = (p != NULL) && ((p - bytes) == (int)length);
4148     } else if (_major_version < JAVA_1_5_VERSION) {
4149       if (bytes[0] != '<') {
4150         p = skip_over_field_name(bytes, true, length);
4151         legal = (p != NULL) && ((p - bytes) == (int)length);
4152       }
4153     } else {
4154       // 4900761: relax the constraints based on JSR202 spec
4155       // Class names may be drawn from the entire Unicode character set.
4156       // Identifiers between '/' must be unqualified names.
4157       // The utf8 string has been verified when parsing cpool entries.
4158       legal = verify_unqualified_name(bytes, length, LegalClass);
4159     }
4160   }
4161   if (!legal) {
4162     ResourceMark rm(THREAD);
4163     Exceptions::fthrow(
4164       THREAD_AND_LOCATION,
4165       vmSymbolHandles::java_lang_ClassFormatError(),
4166       "Illegal class name \"%s\" in class file %s", bytes,
4167       _class_name->as_C_string()
4168     );
4169     return;
4170   }
4171 }
4172 
4173 // Checks if name is a legal field name.
4174 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) {
4175   if (!_need_verify || _relax_verify) { return; }
4176 
4177   char buf[fixed_buffer_size];
4178   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4179   unsigned int length = name->utf8_length();
4180   bool legal = false;
4181 
4182   if (length > 0) {
4183     if (_major_version < JAVA_1_5_VERSION) {
4184       if (bytes[0] != '<') {
4185         char* p = skip_over_field_name(bytes, false, length);
4186         legal = (p != NULL) && ((p - bytes) == (int)length);
4187       }
4188     } else {
4189       // 4881221: relax the constraints based on JSR202 spec
4190       legal = verify_unqualified_name(bytes, length, LegalField);
4191     }
4192   }
4193 
4194   if (!legal) {
4195     ResourceMark rm(THREAD);
4196     Exceptions::fthrow(
4197       THREAD_AND_LOCATION,
4198       vmSymbolHandles::java_lang_ClassFormatError(),
4199       "Illegal field name \"%s\" in class %s", bytes,
4200       _class_name->as_C_string()
4201     );
4202     return;
4203   }
4204 }
4205 
4206 // Checks if name is a legal method name.
4207 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) {
4208   if (!_need_verify || _relax_verify) { return; }
4209 
4210   assert(!name.is_null(), "method name is null");
4211   char buf[fixed_buffer_size];
4212   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4213   unsigned int length = name->utf8_length();
4214   bool legal = false;
4215 
4216   if (length > 0) {
4217     if (bytes[0] == '<') {
4218       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4219         legal = true;
4220       }
4221     } else if (_major_version < JAVA_1_5_VERSION) {
4222       char* p;
4223       p = skip_over_field_name(bytes, false, length);
4224       legal = (p != NULL) && ((p - bytes) == (int)length);
4225     } else {
4226       // 4881221: relax the constraints based on JSR202 spec
4227       legal = verify_unqualified_name(bytes, length, LegalMethod);
4228     }
4229   }
4230 
4231   if (!legal) {
4232     ResourceMark rm(THREAD);
4233     Exceptions::fthrow(
4234       THREAD_AND_LOCATION,
4235       vmSymbolHandles::java_lang_ClassFormatError(),
4236       "Illegal method name \"%s\" in class %s", bytes,
4237       _class_name->as_C_string()
4238     );
4239     return;
4240   }
4241 }
4242 
4243 
4244 // Checks if signature is a legal field signature.
4245 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4246   if (!_need_verify) { return; }
4247 
4248   char buf[fixed_buffer_size];
4249   char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4250   unsigned int length = signature->utf8_length();
4251   char* p = skip_over_field_signature(bytes, false, length, CHECK);
4252 
4253   if (p == NULL || (p - bytes) != (int)length) {
4254     throwIllegalSignature("Field", name, signature, CHECK);
4255   }
4256 }
4257 
4258 // Checks if signature is a legal method signature.
4259 // Returns number of parameters
4260 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) {
4261   if (!_need_verify) {
4262     // make sure caller's args_size will be less than 0 even for non-static
4263     // method so it will be recomputed in compute_size_of_parameters().
4264     return -2;
4265   }
4266 
4267   unsigned int args_size = 0;
4268   char buf[fixed_buffer_size];
4269   char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4270   unsigned int length = signature->utf8_length();
4271   char* nextp;
4272 
4273   // The first character must be a '('
4274   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4275     length--;
4276     // Skip over legal field signatures
4277     nextp = skip_over_field_signature(p, false, length, CHECK_0);
4278     while ((length > 0) && (nextp != NULL)) {
4279       args_size++;
4280       if (p[0] == 'J' || p[0] == 'D') {
4281         args_size++;
4282       }
4283       length -= nextp - p;
4284       p = nextp;
4285       nextp = skip_over_field_signature(p, false, length, CHECK_0);
4286     }
4287     // The first non-signature thing better be a ')'
4288     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4289       length--;
4290       if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4291         // All internal methods must return void
4292         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4293           return args_size;
4294         }
4295       } else {
4296         // Now we better just have a return value
4297         nextp = skip_over_field_signature(p, true, length, CHECK_0);
4298         if (nextp && ((int)length == (nextp - p))) {
4299           return args_size;
4300         }
4301       }
4302     }
4303   }
4304   // Report error
4305   throwIllegalSignature("Method", name, signature, CHECK_0);
4306   return 0;
4307 }
4308 
4309 
4310 // Unqualified names may not contain the characters '.', ';', or '/'.
4311 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>.
4312 // Note that method names may not be <init> or <clinit> in this method.
4313 // Because these names have been checked as special cases before calling this method
4314 // in verify_legal_method_name.
4315 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) {
4316   jchar ch;
4317 
4318   for (char* p = name; p != name + length; ) {
4319     ch = *p;
4320     if (ch < 128) {
4321       p++;
4322       if (ch == '.' || ch == ';') {
4323         return false;   // do not permit '.' or ';'
4324       }
4325       if (type != LegalClass && ch == '/') {
4326         return false;   // do not permit '/' unless it's class name
4327       }
4328       if (type == LegalMethod && (ch == '<' || ch == '>')) {
4329         return false;   // do not permit '<' or '>' in method names
4330       }
4331     } else {
4332       char* tmp_p = UTF8::next(p, &ch);
4333       p = tmp_p;
4334     }
4335   }
4336   return true;
4337 }
4338 
4339 
4340 // Take pointer to a string. Skip over the longest part of the string that could
4341 // be taken as a fieldname. Allow '/' if slash_ok is true.
4342 // Return a pointer to just past the fieldname.
4343 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4344 // being true, we saw consecutive slashes (meaning we were looking for a
4345 // qualified path but found something that was badly-formed).
4346 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4347   char* p;
4348   jchar ch;
4349   jboolean last_is_slash = false;
4350   jboolean not_first_ch = false;
4351 
4352   for (p = name; p != name + length; not_first_ch = true) {
4353     char* old_p = p;
4354     ch = *p;
4355     if (ch < 128) {
4356       p++;
4357       // quick check for ascii
4358       if ((ch >= 'a' && ch <= 'z') ||
4359           (ch >= 'A' && ch <= 'Z') ||
4360           (ch == '_' || ch == '$') ||
4361           (not_first_ch && ch >= '0' && ch <= '9')) {
4362         last_is_slash = false;
4363         continue;
4364       }
4365       if (slash_ok && ch == '/') {
4366         if (last_is_slash) {
4367           return NULL;  // Don't permit consecutive slashes
4368         }
4369         last_is_slash = true;
4370         continue;
4371       }
4372     } else {
4373       jint unicode_ch;
4374       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4375       p = tmp_p;
4376       last_is_slash = false;
4377       // Check if ch is Java identifier start or is Java identifier part
4378       // 4672820: call java.lang.Character methods directly without generating separate tables.
4379       EXCEPTION_MARK;
4380       instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4381 
4382       // return value
4383       JavaValue result(T_BOOLEAN);
4384       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4385       JavaCallArguments args;
4386       args.push_int(unicode_ch);
4387 
4388       // public static boolean isJavaIdentifierStart(char ch);
4389       JavaCalls::call_static(&result,
4390                              klass,
4391                              vmSymbolHandles::isJavaIdentifierStart_name(),
4392                              vmSymbolHandles::int_bool_signature(),
4393                              &args,
4394                              THREAD);
4395 
4396       if (HAS_PENDING_EXCEPTION) {
4397         CLEAR_PENDING_EXCEPTION;
4398         return 0;
4399       }
4400       if (result.get_jboolean()) {
4401         continue;
4402       }
4403 
4404       if (not_first_ch) {
4405         // public static boolean isJavaIdentifierPart(char ch);
4406         JavaCalls::call_static(&result,
4407                                klass,
4408                                vmSymbolHandles::isJavaIdentifierPart_name(),
4409                                vmSymbolHandles::int_bool_signature(),
4410                                &args,
4411                                THREAD);
4412 
4413         if (HAS_PENDING_EXCEPTION) {
4414           CLEAR_PENDING_EXCEPTION;
4415           return 0;
4416         }
4417 
4418         if (result.get_jboolean()) {
4419           continue;
4420         }
4421       }
4422     }
4423     return (not_first_ch) ? old_p : NULL;
4424   }
4425   return (not_first_ch) ? p : NULL;
4426 }
4427 
4428 
4429 // Take pointer to a string. Skip over the longest part of the string that could
4430 // be taken as a field signature. Allow "void" if void_ok.
4431 // Return a pointer to just past the signature.
4432 // Return NULL if no legal signature is found.
4433 char* ClassFileParser::skip_over_field_signature(char* signature,
4434                                                  bool void_ok,
4435                                                  unsigned int length,
4436                                                  TRAPS) {
4437   unsigned int array_dim = 0;
4438   while (length > 0) {
4439     switch (signature[0]) {
4440       case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4441       case JVM_SIGNATURE_BOOLEAN:
4442       case JVM_SIGNATURE_BYTE:
4443       case JVM_SIGNATURE_CHAR:
4444       case JVM_SIGNATURE_SHORT:
4445       case JVM_SIGNATURE_INT:
4446       case JVM_SIGNATURE_FLOAT:
4447       case JVM_SIGNATURE_LONG:
4448       case JVM_SIGNATURE_DOUBLE:
4449         return signature + 1;
4450       case JVM_SIGNATURE_CLASS: {
4451         if (_major_version < JAVA_1_5_VERSION) {
4452           // Skip over the class name if one is there
4453           char* p = skip_over_field_name(signature + 1, true, --length);
4454 
4455           // The next character better be a semicolon
4456           if (p && (p - signature) > 1 && p[0] == ';') {
4457             return p + 1;
4458           }
4459         } else {
4460           // 4900761: For class version > 48, any unicode is allowed in class name.
4461           length--;
4462           signature++;
4463           while (length > 0 && signature[0] != ';') {
4464             if (signature[0] == '.') {
4465               classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4466             }
4467             length--;
4468             signature++;
4469           }
4470           if (signature[0] == ';') { return signature + 1; }
4471         }
4472 
4473         return NULL;
4474       }
4475       case JVM_SIGNATURE_ARRAY:
4476         array_dim++;
4477         if (array_dim > 255) {
4478           // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4479           classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4480         }
4481         // The rest of what's there better be a legal signature
4482         signature++;
4483         length--;
4484         void_ok = false;
4485         break;
4486 
4487       default:
4488         return NULL;
4489     }
4490   }
4491   return NULL;
4492 }