1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classFileParser.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.inline.hpp"
  29 #include "classfile/defaultMethods.hpp"
  30 #include "classfile/javaClasses.inline.hpp"
  31 #include "classfile/symbolTable.hpp"
  32 #include "classfile/systemDictionary.hpp"
  33 #include "classfile/verificationType.hpp"
  34 #include "classfile/verifier.hpp"
  35 #include "classfile/vmSymbols.hpp"
  36 #include "memory/allocation.hpp"
  37 #include "memory/gcLocker.hpp"
  38 #include "memory/metadataFactory.hpp"
  39 #include "memory/oopFactory.hpp"
  40 #include "memory/referenceType.hpp"
  41 #include "memory/resourceArea.hpp"
  42 #include "memory/universe.inline.hpp"
  43 #include "oops/constantPool.hpp"
  44 #include "oops/fieldStreams.hpp"
  45 #include "oops/instanceKlass.hpp"
  46 #include "oops/instanceMirrorKlass.hpp"
  47 #include "oops/klass.inline.hpp"
  48 #include "oops/klassVtable.hpp"
  49 #include "oops/method.hpp"
  50 #include "oops/symbol.hpp"
  51 #include "prims/jvm.h"
  52 #include "prims/jvmtiExport.hpp"
  53 #include "prims/jvmtiThreadState.hpp"
  54 #include "runtime/javaCalls.hpp"
  55 #include "runtime/perfData.hpp"
  56 #include "runtime/reflection.hpp"
  57 #include "runtime/signature.hpp"
  58 #include "runtime/timer.hpp"
  59 #include "services/classLoadingService.hpp"
  60 #include "services/threadService.hpp"
  61 #include "utilities/array.hpp"
  62 #include "utilities/globalDefinitions.hpp"
  63 #include "utilities/exceptions.hpp"
  64 #include "utilities/macros.hpp"
  65 #include "utilities/ostream.hpp"
  66 #include "utilities/resourceHash.hpp"
  67 #if INCLUDE_CDS
  68 #include "classfile/systemDictionaryShared.hpp"
  69 #endif
  70 
  71 // We generally try to create the oops directly when parsing, rather than
  72 // allocating temporary data structures and copying the bytes twice. A
  73 // temporary area is only needed when parsing utf8 entries in the constant
  74 // pool and when parsing line number tables.
  75 
  76 // We add assert in debug mode when class format is not checked.
  77 
  78 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
  79 #define JAVA_MIN_SUPPORTED_VERSION        45
  80 #define JAVA_MAX_SUPPORTED_VERSION        52
  81 #define JAVA_MAX_SUPPORTED_MINOR_VERSION  0
  82 
  83 // Used for two backward compatibility reasons:
  84 // - to check for new additions to the class file format in JDK1.5
  85 // - to check for bug fixes in the format checker in JDK1.5
  86 #define JAVA_1_5_VERSION                  49
  87 
  88 // Used for backward compatibility reasons:
  89 // - to check for javac bug fixes that happened after 1.5
  90 // - also used as the max version when running in jdk6
  91 #define JAVA_6_VERSION                    50
  92 
  93 // Used for backward compatibility reasons:
  94 // - to check NameAndType_info signatures more aggressively
  95 #define JAVA_7_VERSION                    51
  96 
  97 // Extension method support.
  98 #define JAVA_8_VERSION                    52
  99 
 100 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
 101   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 102   // this function (_current can be allocated in a register, with scalar
 103   // replacement of aggregates). The _current pointer is copied back to
 104   // stream() when this function returns. DON'T call another method within
 105   // this method that uses stream().
 106   ClassFileStream* cfs0 = stream();
 107   ClassFileStream cfs1 = *cfs0;
 108   ClassFileStream* cfs = &cfs1;
 109 #ifdef ASSERT
 110   assert(cfs->allocated_on_stack(),"should be local");
 111   u1* old_current = cfs0->current();
 112 #endif
 113   Handle class_loader(THREAD, _loader_data->class_loader());
 114 
 115   // Used for batching symbol allocations.
 116   const char* names[SymbolTable::symbol_alloc_batch_size];
 117   int lengths[SymbolTable::symbol_alloc_batch_size];
 118   int indices[SymbolTable::symbol_alloc_batch_size];
 119   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 120   int names_count = 0;
 121 
 122   // parsing  Index 0 is unused
 123   for (int index = 1; index < length; index++) {
 124     // Each of the following case guarantees one more byte in the stream
 125     // for the following tag or the access_flags following constant pool,
 126     // so we don't need bounds-check for reading tag.
 127     u1 tag = cfs->get_u1_fast();
 128     switch (tag) {
 129       case JVM_CONSTANT_Class :
 130         {
 131           cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 132           u2 name_index = cfs->get_u2_fast();
 133           _cp->klass_index_at_put(index, name_index);
 134         }
 135         break;
 136       case JVM_CONSTANT_Fieldref :
 137         {
 138           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 139           u2 class_index = cfs->get_u2_fast();
 140           u2 name_and_type_index = cfs->get_u2_fast();
 141           _cp->field_at_put(index, class_index, name_and_type_index);
 142         }
 143         break;
 144       case JVM_CONSTANT_Methodref :
 145         {
 146           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 147           u2 class_index = cfs->get_u2_fast();
 148           u2 name_and_type_index = cfs->get_u2_fast();
 149           _cp->method_at_put(index, class_index, name_and_type_index);
 150         }
 151         break;
 152       case JVM_CONSTANT_InterfaceMethodref :
 153         {
 154           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 155           u2 class_index = cfs->get_u2_fast();
 156           u2 name_and_type_index = cfs->get_u2_fast();
 157           _cp->interface_method_at_put(index, class_index, name_and_type_index);
 158         }
 159         break;
 160       case JVM_CONSTANT_String :
 161         {
 162           cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 163           u2 string_index = cfs->get_u2_fast();
 164           _cp->string_index_at_put(index, string_index);
 165         }
 166         break;
 167       case JVM_CONSTANT_MethodHandle :
 168       case JVM_CONSTANT_MethodType :
 169         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 170           classfile_parse_error(
 171             "Class file version does not support constant tag %u in class file %s",
 172             tag, CHECK);
 173         }
 174         if (tag == JVM_CONSTANT_MethodHandle) {
 175           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 176           u1 ref_kind = cfs->get_u1_fast();
 177           u2 method_index = cfs->get_u2_fast();
 178           _cp->method_handle_index_at_put(index, ref_kind, method_index);
 179         } else if (tag == JVM_CONSTANT_MethodType) {
 180           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 181           u2 signature_index = cfs->get_u2_fast();
 182           _cp->method_type_index_at_put(index, signature_index);
 183         } else {
 184           ShouldNotReachHere();
 185         }
 186         break;
 187       case JVM_CONSTANT_InvokeDynamic :
 188         {
 189           if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 190             classfile_parse_error(
 191               "Class file version does not support constant tag %u in class file %s",
 192               tag, CHECK);
 193           }
 194           cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 195           u2 bootstrap_specifier_index = cfs->get_u2_fast();
 196           u2 name_and_type_index = cfs->get_u2_fast();
 197           if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
 198             _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 199           _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 200         }
 201         break;
 202       case JVM_CONSTANT_Integer :
 203         {
 204           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 205           u4 bytes = cfs->get_u4_fast();
 206           _cp->int_at_put(index, (jint) bytes);
 207         }
 208         break;
 209       case JVM_CONSTANT_Float :
 210         {
 211           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 212           u4 bytes = cfs->get_u4_fast();
 213           _cp->float_at_put(index, *(jfloat*)&bytes);
 214         }
 215         break;
 216       case JVM_CONSTANT_Long :
 217         // A mangled type might cause you to overrun allocated memory
 218         guarantee_property(index+1 < length,
 219                            "Invalid constant pool entry %u in class file %s",
 220                            index, CHECK);
 221         {
 222           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 223           u8 bytes = cfs->get_u8_fast();
 224           _cp->long_at_put(index, bytes);
 225         }
 226         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 227         break;
 228       case JVM_CONSTANT_Double :
 229         // A mangled type might cause you to overrun allocated memory
 230         guarantee_property(index+1 < length,
 231                            "Invalid constant pool entry %u in class file %s",
 232                            index, CHECK);
 233         {
 234           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 235           u8 bytes = cfs->get_u8_fast();
 236           _cp->double_at_put(index, *(jdouble*)&bytes);
 237         }
 238         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 239         break;
 240       case JVM_CONSTANT_NameAndType :
 241         {
 242           cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 243           u2 name_index = cfs->get_u2_fast();
 244           u2 signature_index = cfs->get_u2_fast();
 245           _cp->name_and_type_at_put(index, name_index, signature_index);
 246         }
 247         break;
 248       case JVM_CONSTANT_Utf8 :
 249         {
 250           cfs->guarantee_more(2, CHECK);  // utf8_length
 251           u2  utf8_length = cfs->get_u2_fast();
 252           u1* utf8_buffer = cfs->get_u1_buffer();
 253           assert(utf8_buffer != NULL, "null utf8 buffer");
 254           // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 255           cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 256           cfs->skip_u1_fast(utf8_length);
 257 
 258           // Before storing the symbol, make sure it's legal
 259           if (_need_verify) {
 260             verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
 261           }
 262 
 263           if (has_cp_patch_at(index)) {
 264             Handle patch = clear_cp_patch_at(index);
 265             guarantee_property(java_lang_String::is_instance(patch()),
 266                                "Illegal utf8 patch at %d in class file %s",
 267                                index, CHECK);
 268             char* str = java_lang_String::as_utf8_string(patch());
 269             // (could use java_lang_String::as_symbol instead, but might as well batch them)
 270             utf8_buffer = (u1*) str;
 271             utf8_length = (int) strlen(str);
 272           }
 273 
 274           unsigned int hash;
 275           Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
 276           if (result == NULL) {
 277             names[names_count] = (char*)utf8_buffer;
 278             lengths[names_count] = utf8_length;
 279             indices[names_count] = index;
 280             hashValues[names_count++] = hash;
 281             if (names_count == SymbolTable::symbol_alloc_batch_size) {
 282               SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
 283               names_count = 0;
 284             }
 285           } else {
 286             _cp->symbol_at_put(index, result);
 287           }
 288         }
 289         break;
 290       default:
 291         classfile_parse_error(
 292           "Unknown constant tag %u in class file %s", tag, CHECK);
 293         break;
 294     }
 295   }
 296 
 297   // Allocate the remaining symbols
 298   if (names_count > 0) {
 299     SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
 300   }
 301 
 302   // Copy _current pointer of local copy back to stream().
 303 #ifdef ASSERT
 304   assert(cfs0->current() == old_current, "non-exclusive use of stream()");
 305 #endif
 306   cfs0->set_current(cfs1.current());
 307 }
 308 
 309 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
 310 
 311 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
 312   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
 313     return cp->symbol_at(index);
 314   else
 315     return NULL;
 316 }
 317 
 318 PRAGMA_DIAG_PUSH
 319 PRAGMA_FORMAT_NONLITERAL_IGNORED
 320 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) {
 321   ResourceMark rm(THREAD);
 322   fatal(err_msg(msg, _class_name->as_C_string()));
 323 }
 324 
 325 void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) {
 326   ResourceMark rm(THREAD);
 327   fatal(err_msg(msg, index, _class_name->as_C_string()));
 328 }
 329 PRAGMA_DIAG_POP
 330 
 331 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
 332   ClassFileStream* cfs = stream();
 333   constantPoolHandle nullHandle;
 334 
 335   cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
 336   u2 length = cfs->get_u2_fast();
 337   guarantee_property(
 338     length >= 1, "Illegal constant pool size %u in class file %s",
 339     length, CHECK_(nullHandle));
 340   ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
 341                                                         CHECK_(nullHandle));
 342   _cp = constant_pool; // save in case of errors
 343   constantPoolHandle cp (THREAD, constant_pool);
 344 
 345   // parsing constant pool entries
 346   parse_constant_pool_entries(length, CHECK_(nullHandle));
 347 
 348   int index = 1;  // declared outside of loops for portability
 349 
 350   // first verification pass - validate cross references and fixup class and string constants
 351   for (index = 1; index < length; index++) {          // Index 0 is unused
 352     jbyte tag = cp->tag_at(index).value();
 353     switch (tag) {
 354       case JVM_CONSTANT_Class :
 355         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 356         break;
 357       case JVM_CONSTANT_Fieldref :
 358         // fall through
 359       case JVM_CONSTANT_Methodref :
 360         // fall through
 361       case JVM_CONSTANT_InterfaceMethodref : {
 362         if (!_need_verify) break;
 363         int klass_ref_index = cp->klass_ref_index_at(index);
 364         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 365         check_property(valid_klass_reference_at(klass_ref_index),
 366                        "Invalid constant pool index %u in class file %s",
 367                        klass_ref_index,
 368                        CHECK_(nullHandle));
 369         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 370                        cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 371                        "Invalid constant pool index %u in class file %s",
 372                        name_and_type_ref_index,
 373                        CHECK_(nullHandle));
 374         break;
 375       }
 376       case JVM_CONSTANT_String :
 377         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 378         break;
 379       case JVM_CONSTANT_Integer :
 380         break;
 381       case JVM_CONSTANT_Float :
 382         break;
 383       case JVM_CONSTANT_Long :
 384       case JVM_CONSTANT_Double :
 385         index++;
 386         check_property(
 387           (index < length && cp->tag_at(index).is_invalid()),
 388           "Improper constant pool long/double index %u in class file %s",
 389           index, CHECK_(nullHandle));
 390         break;
 391       case JVM_CONSTANT_NameAndType : {
 392         if (!_need_verify) break;
 393         int name_ref_index = cp->name_ref_index_at(index);
 394         int signature_ref_index = cp->signature_ref_index_at(index);
 395         check_property(valid_symbol_at(name_ref_index),
 396                  "Invalid constant pool index %u in class file %s",
 397                  name_ref_index, CHECK_(nullHandle));
 398         check_property(valid_symbol_at(signature_ref_index),
 399                  "Invalid constant pool index %u in class file %s",
 400                  signature_ref_index, CHECK_(nullHandle));
 401         break;
 402       }
 403       case JVM_CONSTANT_Utf8 :
 404         break;
 405       case JVM_CONSTANT_UnresolvedClass :         // fall-through
 406       case JVM_CONSTANT_UnresolvedClassInError:
 407         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 408         break;
 409       case JVM_CONSTANT_ClassIndex :
 410         {
 411           int class_index = cp->klass_index_at(index);
 412           check_property(valid_symbol_at(class_index),
 413                  "Invalid constant pool index %u in class file %s",
 414                  class_index, CHECK_(nullHandle));
 415           cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
 416         }
 417         break;
 418       case JVM_CONSTANT_StringIndex :
 419         {
 420           int string_index = cp->string_index_at(index);
 421           check_property(valid_symbol_at(string_index),
 422                  "Invalid constant pool index %u in class file %s",
 423                  string_index, CHECK_(nullHandle));
 424           Symbol* sym = cp->symbol_at(string_index);
 425           cp->unresolved_string_at_put(index, sym);
 426         }
 427         break;
 428       case JVM_CONSTANT_MethodHandle :
 429         {
 430           int ref_index = cp->method_handle_index_at(index);
 431           check_property(
 432             valid_cp_range(ref_index, length),
 433               "Invalid constant pool index %u in class file %s",
 434               ref_index, CHECK_(nullHandle));
 435           constantTag tag = cp->tag_at(ref_index);
 436           int ref_kind  = cp->method_handle_ref_kind_at(index);
 437           switch (ref_kind) {
 438           case JVM_REF_getField:
 439           case JVM_REF_getStatic:
 440           case JVM_REF_putField:
 441           case JVM_REF_putStatic:
 442             check_property(
 443               tag.is_field(),
 444               "Invalid constant pool index %u in class file %s (not a field)",
 445               ref_index, CHECK_(nullHandle));
 446             break;
 447           case JVM_REF_invokeVirtual:
 448           case JVM_REF_newInvokeSpecial:
 449             check_property(
 450               tag.is_method(),
 451               "Invalid constant pool index %u in class file %s (not a method)",
 452               ref_index, CHECK_(nullHandle));
 453             break;
 454           case JVM_REF_invokeStatic:
 455           case JVM_REF_invokeSpecial:
 456             check_property(tag.is_method() ||
 457                            ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 458                "Invalid constant pool index %u in class file %s (not a method)",
 459                ref_index, CHECK_(nullHandle));
 460              break;
 461           case JVM_REF_invokeInterface:
 462             check_property(
 463               tag.is_interface_method(),
 464               "Invalid constant pool index %u in class file %s (not an interface method)",
 465               ref_index, CHECK_(nullHandle));
 466             break;
 467           default:
 468             classfile_parse_error(
 469               "Bad method handle kind at constant pool index %u in class file %s",
 470               index, CHECK_(nullHandle));
 471           }
 472           // Keep the ref_index unchanged.  It will be indirected at link-time.
 473         }
 474         break;
 475       case JVM_CONSTANT_MethodType :
 476         {
 477           int ref_index = cp->method_type_index_at(index);
 478           check_property(valid_symbol_at(ref_index),
 479                  "Invalid constant pool index %u in class file %s",
 480                  ref_index, CHECK_(nullHandle));
 481         }
 482         break;
 483       case JVM_CONSTANT_InvokeDynamic :
 484         {
 485           int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
 486           check_property(valid_cp_range(name_and_type_ref_index, length) &&
 487                          cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 488                          "Invalid constant pool index %u in class file %s",
 489                          name_and_type_ref_index,
 490                          CHECK_(nullHandle));
 491           // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
 492           break;
 493         }
 494       default:
 495         fatal(err_msg("bad constant pool tag value %u",
 496                       cp->tag_at(index).value()));
 497         ShouldNotReachHere();
 498         break;
 499     } // end of switch
 500   } // end of for
 501 
 502   if (_cp_patches != NULL) {
 503     // need to treat this_class specially...
 504     int this_class_index;
 505     {
 506       cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
 507       u1* mark = cfs->current();
 508       u2 flags         = cfs->get_u2_fast();
 509       this_class_index = cfs->get_u2_fast();
 510       cfs->set_current(mark);  // revert to mark
 511     }
 512 
 513     for (index = 1; index < length; index++) {          // Index 0 is unused
 514       if (has_cp_patch_at(index)) {
 515         guarantee_property(index != this_class_index,
 516                            "Illegal constant pool patch to self at %d in class file %s",
 517                            index, CHECK_(nullHandle));
 518         patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
 519       }
 520     }
 521   }
 522 
 523   if (!_need_verify) {
 524     return cp;
 525   }
 526 
 527   // second verification pass - checks the strings are of the right format.
 528   // but not yet to the other entries
 529   for (index = 1; index < length; index++) {
 530     jbyte tag = cp->tag_at(index).value();
 531     switch (tag) {
 532       case JVM_CONSTANT_UnresolvedClass: {
 533         Symbol*  class_name = cp->klass_name_at(index);
 534         // check the name, even if _cp_patches will overwrite it
 535         verify_legal_class_name(class_name, CHECK_(nullHandle));
 536         break;
 537       }
 538       case JVM_CONSTANT_NameAndType: {
 539         if (_need_verify && _major_version >= JAVA_7_VERSION) {
 540           int sig_index = cp->signature_ref_index_at(index);
 541           int name_index = cp->name_ref_index_at(index);
 542           Symbol*  name = cp->symbol_at(name_index);
 543           Symbol*  sig = cp->symbol_at(sig_index);
 544           if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
 545             verify_legal_method_signature(name, sig, CHECK_(nullHandle));
 546           } else {
 547             verify_legal_field_signature(name, sig, CHECK_(nullHandle));
 548           }
 549         }
 550         break;
 551       }
 552       case JVM_CONSTANT_InvokeDynamic:
 553       case JVM_CONSTANT_Fieldref:
 554       case JVM_CONSTANT_Methodref:
 555       case JVM_CONSTANT_InterfaceMethodref: {
 556         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 557         // already verified to be utf8
 558         int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 559         // already verified to be utf8
 560         int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
 561         Symbol*  name = cp->symbol_at(name_ref_index);
 562         Symbol*  signature = cp->symbol_at(signature_ref_index);
 563         if (tag == JVM_CONSTANT_Fieldref) {
 564           verify_legal_field_name(name, CHECK_(nullHandle));
 565           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 566             // Signature is verified above, when iterating NameAndType_info.
 567             // Need only to be sure it's the right type.
 568             if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
 569               throwIllegalSignature(
 570                   "Field", name, signature, CHECK_(nullHandle));
 571             }
 572           } else {
 573             verify_legal_field_signature(name, signature, CHECK_(nullHandle));
 574           }
 575         } else {
 576           verify_legal_method_name(name, CHECK_(nullHandle));
 577           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 578             // Signature is verified above, when iterating NameAndType_info.
 579             // Need only to be sure it's the right type.
 580             if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
 581               throwIllegalSignature(
 582                   "Method", name, signature, CHECK_(nullHandle));
 583             }
 584           } else {
 585             verify_legal_method_signature(name, signature, CHECK_(nullHandle));
 586           }
 587           if (tag == JVM_CONSTANT_Methodref) {
 588             // 4509014: If a class method name begins with '<', it must be "<init>".
 589             assert(name != NULL, "method name in constant pool is null");
 590             unsigned int name_len = name->utf8_length();
 591             assert(name_len > 0, "bad method name");  // already verified as legal name
 592             if (name->byte_at(0) == '<') {
 593               if (name != vmSymbols::object_initializer_name()) {
 594                 classfile_parse_error(
 595                   "Bad method name at constant pool index %u in class file %s",
 596                   name_ref_index, CHECK_(nullHandle));
 597               }
 598             }
 599           }
 600         }
 601         break;
 602       }
 603       case JVM_CONSTANT_MethodHandle: {
 604         int ref_index = cp->method_handle_index_at(index);
 605         int ref_kind  = cp->method_handle_ref_kind_at(index);
 606         switch (ref_kind) {
 607         case JVM_REF_invokeVirtual:
 608         case JVM_REF_invokeStatic:
 609         case JVM_REF_invokeSpecial:
 610         case JVM_REF_newInvokeSpecial:
 611           {
 612             int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
 613             int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 614             Symbol*  name = cp->symbol_at(name_ref_index);
 615             if (ref_kind == JVM_REF_newInvokeSpecial) {
 616               if (name != vmSymbols::object_initializer_name()) {
 617                 classfile_parse_error(
 618                   "Bad constructor name at constant pool index %u in class file %s",
 619                   name_ref_index, CHECK_(nullHandle));
 620               }
 621             } else {
 622               if (name == vmSymbols::object_initializer_name()) {
 623                 classfile_parse_error(
 624                   "Bad method name at constant pool index %u in class file %s",
 625                   name_ref_index, CHECK_(nullHandle));
 626               }
 627             }
 628           }
 629           break;
 630           // Other ref_kinds are already fully checked in previous pass.
 631         }
 632         break;
 633       }
 634       case JVM_CONSTANT_MethodType: {
 635         Symbol* no_name = vmSymbols::type_name(); // place holder
 636         Symbol*  signature = cp->method_type_signature_at(index);
 637         verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
 638         break;
 639       }
 640       case JVM_CONSTANT_Utf8: {
 641         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 642       }
 643     }  // end of switch
 644   }  // end of for
 645 
 646   return cp;
 647 }
 648 
 649 
 650 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
 651   BasicType patch_type = T_VOID;
 652 
 653   switch (cp->tag_at(index).value()) {
 654 
 655   case JVM_CONSTANT_UnresolvedClass :
 656     // Patching a class means pre-resolving it.
 657     // The name in the constant pool is ignored.
 658     if (java_lang_Class::is_instance(patch())) {
 659       guarantee_property(!java_lang_Class::is_primitive(patch()),
 660                          "Illegal class patch at %d in class file %s",
 661                          index, CHECK);
 662       cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
 663     } else {
 664       guarantee_property(java_lang_String::is_instance(patch()),
 665                          "Illegal class patch at %d in class file %s",
 666                          index, CHECK);
 667       Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
 668       cp->unresolved_klass_at_put(index, name);
 669     }
 670     break;
 671 
 672   case JVM_CONSTANT_String :
 673     // skip this patch and don't clear it.  Needs the oop array for resolved
 674     // references to be created first.
 675     return;
 676 
 677   case JVM_CONSTANT_Integer : patch_type = T_INT;    goto patch_prim;
 678   case JVM_CONSTANT_Float :   patch_type = T_FLOAT;  goto patch_prim;
 679   case JVM_CONSTANT_Long :    patch_type = T_LONG;   goto patch_prim;
 680   case JVM_CONSTANT_Double :  patch_type = T_DOUBLE; goto patch_prim;
 681   patch_prim:
 682     {
 683       jvalue value;
 684       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 685       guarantee_property(value_type == patch_type,
 686                          "Illegal primitive patch at %d in class file %s",
 687                          index, CHECK);
 688       switch (value_type) {
 689       case T_INT:    cp->int_at_put(index,   value.i); break;
 690       case T_FLOAT:  cp->float_at_put(index, value.f); break;
 691       case T_LONG:   cp->long_at_put(index,  value.j); break;
 692       case T_DOUBLE: cp->double_at_put(index, value.d); break;
 693       default:       assert(false, "");
 694       }
 695     }
 696     break;
 697 
 698   default:
 699     // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 700     guarantee_property(!has_cp_patch_at(index),
 701                        "Illegal unexpected patch at %d in class file %s",
 702                        index, CHECK);
 703     return;
 704   }
 705 
 706   // On fall-through, mark the patch as used.
 707   clear_cp_patch_at(index);
 708 }
 709 
 710 
 711 class NameSigHash: public ResourceObj {
 712  public:
 713   Symbol*       _name;       // name
 714   Symbol*       _sig;        // signature
 715   NameSigHash*  _next;       // Next entry in hash table
 716 };
 717 
 718 
 719 #define HASH_ROW_SIZE 256
 720 
 721 unsigned int hash(Symbol* name, Symbol* sig) {
 722   unsigned int raw_hash = 0;
 723   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 724   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 725 
 726   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 727 }
 728 
 729 
 730 void initialize_hashtable(NameSigHash** table) {
 731   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 732 }
 733 
 734 // Return false if the name/sig combination is found in table.
 735 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 736 // The old format checker uses heap sort to find duplicates.
 737 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 738 // of table since we don't expect Symbol*'s to move.
 739 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
 740   assert(name != NULL, "name in constant pool is NULL");
 741 
 742   // First lookup for duplicates
 743   int index = hash(name, sig);
 744   NameSigHash* entry = table[index];
 745   while (entry != NULL) {
 746     if (entry->_name == name && entry->_sig == sig) {
 747       return false;
 748     }
 749     entry = entry->_next;
 750   }
 751 
 752   // No duplicate is found, allocate a new entry and fill it.
 753   entry = new NameSigHash();
 754   entry->_name = name;
 755   entry->_sig = sig;
 756 
 757   // Insert into hash table
 758   entry->_next = table[index];
 759   table[index] = entry;
 760 
 761   return true;
 762 }
 763 
 764 
 765 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
 766                                                  Handle protection_domain,
 767                                                  Symbol* class_name,
 768                                                  bool* has_default_methods,
 769                                                  TRAPS) {
 770   if (length == 0) {
 771     _local_interfaces = Universe::the_empty_klass_array();
 772   } else {
 773     ClassFileStream* cfs = stream();
 774     assert(length > 0, "only called for length>0");
 775     _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
 776 
 777     int index;
 778     for (index = 0; index < length; index++) {
 779       u2 interface_index = cfs->get_u2(CHECK_NULL);
 780       KlassHandle interf;
 781       check_property(
 782         valid_klass_reference_at(interface_index),
 783         "Interface name has bad constant pool index %u in class file %s",
 784         interface_index, CHECK_NULL);
 785       if (_cp->tag_at(interface_index).is_klass()) {
 786         interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
 787       } else {
 788         Symbol*  unresolved_klass  = _cp->klass_name_at(interface_index);
 789 
 790         // Don't need to check legal name because it's checked when parsing constant pool.
 791         // But need to make sure it's not an array type.
 792         guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 793                            "Bad interface name in class file %s", CHECK_NULL);
 794         Handle class_loader(THREAD, _loader_data->class_loader());
 795 
 796         // Call resolve_super so classcircularity is checked
 797         Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
 798                       unresolved_klass, class_loader, protection_domain,
 799                       false, CHECK_NULL);
 800         interf = KlassHandle(THREAD, k);
 801       }
 802 
 803       if (!interf()->is_interface()) {
 804         THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
 805       }
 806       if (InstanceKlass::cast(interf())->has_default_methods()) {
 807         *has_default_methods = true;
 808       }
 809       _local_interfaces->at_put(index, interf());
 810     }
 811 
 812     if (!_need_verify || length <= 1) {
 813       return _local_interfaces;
 814     }
 815 
 816     // Check if there's any duplicates in interfaces
 817     ResourceMark rm(THREAD);
 818     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
 819       THREAD, NameSigHash*, HASH_ROW_SIZE);
 820     initialize_hashtable(interface_names);
 821     bool dup = false;
 822     {
 823       debug_only(No_Safepoint_Verifier nsv;)
 824       for (index = 0; index < length; index++) {
 825         Klass* k = _local_interfaces->at(index);
 826         Symbol* name = InstanceKlass::cast(k)->name();
 827         // If no duplicates, add (name, NULL) in hashtable interface_names.
 828         if (!put_after_lookup(name, NULL, interface_names)) {
 829           dup = true;
 830           break;
 831         }
 832       }
 833     }
 834     if (dup) {
 835       classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
 836     }
 837   }
 838   return _local_interfaces;
 839 }
 840 
 841 
 842 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
 843   // Make sure the constant pool entry is of a type appropriate to this field
 844   guarantee_property(
 845     (constantvalue_index > 0 &&
 846       constantvalue_index < _cp->length()),
 847     "Bad initial value index %u in ConstantValue attribute in class file %s",
 848     constantvalue_index, CHECK);
 849   constantTag value_type = _cp->tag_at(constantvalue_index);
 850   switch ( _cp->basic_type_for_signature_at(signature_index) ) {
 851     case T_LONG:
 852       guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
 853       break;
 854     case T_FLOAT:
 855       guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
 856       break;
 857     case T_DOUBLE:
 858       guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
 859       break;
 860     case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
 861       guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
 862       break;
 863     case T_OBJECT:
 864       guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 865                          && value_type.is_string()),
 866                          "Bad string initial value in class file %s", CHECK);
 867       break;
 868     default:
 869       classfile_parse_error(
 870         "Unable to set initial value %u in class file %s",
 871         constantvalue_index, CHECK);
 872   }
 873 }
 874 
 875 
 876 // Parse attributes for a field.
 877 void ClassFileParser::parse_field_attributes(u2 attributes_count,
 878                                              bool is_static, u2 signature_index,
 879                                              u2* constantvalue_index_addr,
 880                                              bool* is_synthetic_addr,
 881                                              u2* generic_signature_index_addr,
 882                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
 883                                              TRAPS) {
 884   ClassFileStream* cfs = stream();
 885   assert(attributes_count > 0, "length should be greater than 0");
 886   u2 constantvalue_index = 0;
 887   u2 generic_signature_index = 0;
 888   bool is_synthetic = false;
 889   u1* runtime_visible_annotations = NULL;
 890   int runtime_visible_annotations_length = 0;
 891   u1* runtime_invisible_annotations = NULL;
 892   int runtime_invisible_annotations_length = 0;
 893   u1* runtime_visible_type_annotations = NULL;
 894   int runtime_visible_type_annotations_length = 0;
 895   u1* runtime_invisible_type_annotations = NULL;
 896   int runtime_invisible_type_annotations_length = 0;
 897   bool runtime_invisible_annotations_exists = false;
 898   bool runtime_invisible_type_annotations_exists = false;
 899   while (attributes_count--) {
 900     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
 901     u2 attribute_name_index = cfs->get_u2_fast();
 902     u4 attribute_length = cfs->get_u4_fast();
 903     check_property(valid_symbol_at(attribute_name_index),
 904                    "Invalid field attribute index %u in class file %s",
 905                    attribute_name_index,
 906                    CHECK);
 907     Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
 908     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
 909       // ignore if non-static
 910       if (constantvalue_index != 0) {
 911         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
 912       }
 913       check_property(
 914         attribute_length == 2,
 915         "Invalid ConstantValue field attribute length %u in class file %s",
 916         attribute_length, CHECK);
 917       constantvalue_index = cfs->get_u2(CHECK);
 918       if (_need_verify) {
 919         verify_constantvalue(constantvalue_index, signature_index, CHECK);
 920       }
 921     } else if (attribute_name == vmSymbols::tag_synthetic()) {
 922       if (attribute_length != 0) {
 923         classfile_parse_error(
 924           "Invalid Synthetic field attribute length %u in class file %s",
 925           attribute_length, CHECK);
 926       }
 927       is_synthetic = true;
 928     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
 929       if (attribute_length != 0) {
 930         classfile_parse_error(
 931           "Invalid Deprecated field attribute length %u in class file %s",
 932           attribute_length, CHECK);
 933       }
 934     } else if (_major_version >= JAVA_1_5_VERSION) {
 935       if (attribute_name == vmSymbols::tag_signature()) {
 936         if (attribute_length != 2) {
 937           classfile_parse_error(
 938             "Wrong size %u for field's Signature attribute in class file %s",
 939             attribute_length, CHECK);
 940         }
 941         generic_signature_index = parse_generic_signature_attribute(CHECK);
 942       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
 943         if (runtime_visible_annotations != NULL) {
 944           classfile_parse_error(
 945             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
 946         }
 947         runtime_visible_annotations_length = attribute_length;
 948         runtime_visible_annotations = cfs->get_u1_buffer();
 949         assert(runtime_visible_annotations != NULL, "null visible annotations");
 950         parse_annotations(runtime_visible_annotations,
 951                           runtime_visible_annotations_length,
 952                           parsed_annotations,
 953                           CHECK);
 954         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
 955       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
 956         if (runtime_invisible_annotations_exists) {
 957           classfile_parse_error(
 958             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
 959         }
 960         runtime_invisible_annotations_exists = true;
 961         if (PreserveAllAnnotations) {
 962           runtime_invisible_annotations_length = attribute_length;
 963           runtime_invisible_annotations = cfs->get_u1_buffer();
 964           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
 965         }
 966         cfs->skip_u1(attribute_length, CHECK);
 967       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
 968         if (runtime_visible_type_annotations != NULL) {
 969           classfile_parse_error(
 970             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
 971         }
 972         runtime_visible_type_annotations_length = attribute_length;
 973         runtime_visible_type_annotations = cfs->get_u1_buffer();
 974         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
 975         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
 976       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
 977         if (runtime_invisible_type_annotations_exists) {
 978           classfile_parse_error(
 979             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
 980         } else {
 981           runtime_invisible_type_annotations_exists = true;
 982         }
 983         if (PreserveAllAnnotations) {
 984           runtime_invisible_type_annotations_length = attribute_length;
 985           runtime_invisible_type_annotations = cfs->get_u1_buffer();
 986           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
 987         }
 988         cfs->skip_u1(attribute_length, CHECK);
 989       } else {
 990         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 991       }
 992     } else {
 993       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 994     }
 995   }
 996 
 997   *constantvalue_index_addr = constantvalue_index;
 998   *is_synthetic_addr = is_synthetic;
 999   *generic_signature_index_addr = generic_signature_index;
1000   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1001                                             runtime_visible_annotations_length,
1002                                             runtime_invisible_annotations,
1003                                             runtime_invisible_annotations_length,
1004                                             CHECK);
1005   parsed_annotations->set_field_annotations(a);
1006   a = assemble_annotations(runtime_visible_type_annotations,
1007                            runtime_visible_type_annotations_length,
1008                            runtime_invisible_type_annotations,
1009                            runtime_invisible_type_annotations_length,
1010                            CHECK);
1011   parsed_annotations->set_field_type_annotations(a);
1012   return;
1013 }
1014 
1015 
1016 // Field allocation types. Used for computing field offsets.
1017 
1018 enum FieldAllocationType {
1019   STATIC_OOP,           // Oops
1020   STATIC_BYTE,          // Boolean, Byte, char
1021   STATIC_SHORT,         // shorts
1022   STATIC_WORD,          // ints
1023   STATIC_DOUBLE,        // aligned long or double
1024   NONSTATIC_OOP,
1025   NONSTATIC_BYTE,
1026   NONSTATIC_SHORT,
1027   NONSTATIC_WORD,
1028   NONSTATIC_DOUBLE,
1029   MAX_FIELD_ALLOCATION_TYPE,
1030   BAD_ALLOCATION_TYPE = -1
1031 };
1032 
1033 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1034   BAD_ALLOCATION_TYPE, // 0
1035   BAD_ALLOCATION_TYPE, // 1
1036   BAD_ALLOCATION_TYPE, // 2
1037   BAD_ALLOCATION_TYPE, // 3
1038   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1039   NONSTATIC_SHORT,     // T_CHAR        =  5,
1040   NONSTATIC_WORD,      // T_FLOAT       =  6,
1041   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1042   NONSTATIC_BYTE,      // T_BYTE        =  8,
1043   NONSTATIC_SHORT,     // T_SHORT       =  9,
1044   NONSTATIC_WORD,      // T_INT         = 10,
1045   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1046   NONSTATIC_OOP,       // T_OBJECT      = 12,
1047   NONSTATIC_OOP,       // T_ARRAY       = 13,
1048   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1049   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1050   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1051   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1052   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1053   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1054   BAD_ALLOCATION_TYPE, // 0
1055   BAD_ALLOCATION_TYPE, // 1
1056   BAD_ALLOCATION_TYPE, // 2
1057   BAD_ALLOCATION_TYPE, // 3
1058   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1059   STATIC_SHORT,        // T_CHAR        =  5,
1060   STATIC_WORD,         // T_FLOAT       =  6,
1061   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1062   STATIC_BYTE,         // T_BYTE        =  8,
1063   STATIC_SHORT,        // T_SHORT       =  9,
1064   STATIC_WORD,         // T_INT         = 10,
1065   STATIC_DOUBLE,       // T_LONG        = 11,
1066   STATIC_OOP,          // T_OBJECT      = 12,
1067   STATIC_OOP,          // T_ARRAY       = 13,
1068   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1069   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1070   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1071   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1072   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1073   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1074 };
1075 
1076 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1077   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1078   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1079   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1080   return result;
1081 }
1082 
1083 class FieldAllocationCount: public ResourceObj {
1084  public:
1085   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1086 
1087   FieldAllocationCount() {
1088     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1089       count[i] = 0;
1090     }
1091   }
1092 
1093   FieldAllocationType update(bool is_static, BasicType type) {
1094     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1095     // Make sure there is no overflow with injected fields.
1096     assert(count[atype] < 0xFFFF, "More than 65535 fields");
1097     count[atype]++;
1098     return atype;
1099   }
1100 };
1101 
1102 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1103                                          bool is_interface,
1104                                          FieldAllocationCount *fac,
1105                                          u2* java_fields_count_ptr, TRAPS) {
1106   ClassFileStream* cfs = stream();
1107   cfs->guarantee_more(2, CHECK_NULL);  // length
1108   u2 length = cfs->get_u2_fast();
1109   *java_fields_count_ptr = length;
1110 
1111   int num_injected = 0;
1112   InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1113   int total_fields = length + num_injected;
1114 
1115   // The field array starts with tuples of shorts
1116   // [access, name index, sig index, initial value index, byte offset].
1117   // A generic signature slot only exists for field with generic
1118   // signature attribute. And the access flag is set with
1119   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1120   // signature slots are at the end of the field array and after all
1121   // other fields data.
1122   //
1123   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1124   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1125   //       ...
1126   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1127   //       [generic signature index]
1128   //       [generic signature index]
1129   //       ...
1130   //
1131   // Allocate a temporary resource array for field data. For each field,
1132   // a slot is reserved in the temporary array for the generic signature
1133   // index. After parsing all fields, the data are copied to a permanent
1134   // array and any unused slots will be discarded.
1135   ResourceMark rm(THREAD);
1136   u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1137              THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1138 
1139   // The generic signature slots start after all other fields' data.
1140   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1141   int num_generic_signature = 0;
1142   for (int n = 0; n < length; n++) {
1143     cfs->guarantee_more(8, CHECK_NULL);  // access_flags, name_index, descriptor_index, attributes_count
1144 
1145     AccessFlags access_flags;
1146     jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1147     verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1148     access_flags.set_flags(flags);
1149 
1150     u2 name_index = cfs->get_u2_fast();
1151     int cp_size = _cp->length();
1152     check_property(valid_symbol_at(name_index),
1153       "Invalid constant pool index %u for field name in class file %s",
1154       name_index,
1155       CHECK_NULL);
1156     Symbol*  name = _cp->symbol_at(name_index);
1157     verify_legal_field_name(name, CHECK_NULL);
1158 
1159     u2 signature_index = cfs->get_u2_fast();
1160     check_property(valid_symbol_at(signature_index),
1161       "Invalid constant pool index %u for field signature in class file %s",
1162       signature_index, CHECK_NULL);
1163     Symbol*  sig = _cp->symbol_at(signature_index);
1164     verify_legal_field_signature(name, sig, CHECK_NULL);
1165 
1166     u2 constantvalue_index = 0;
1167     bool is_synthetic = false;
1168     u2 generic_signature_index = 0;
1169     bool is_static = access_flags.is_static();
1170     FieldAnnotationCollector parsed_annotations(_loader_data);
1171 
1172     u2 attributes_count = cfs->get_u2_fast();
1173     if (attributes_count > 0) {
1174       parse_field_attributes(attributes_count, is_static, signature_index,
1175                              &constantvalue_index, &is_synthetic,
1176                              &generic_signature_index, &parsed_annotations,
1177                              CHECK_NULL);
1178       if (parsed_annotations.field_annotations() != NULL) {
1179         if (_fields_annotations == NULL) {
1180           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1181                                              _loader_data, length, NULL,
1182                                              CHECK_NULL);
1183         }
1184         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1185         parsed_annotations.set_field_annotations(NULL);
1186       }
1187       if (parsed_annotations.field_type_annotations() != NULL) {
1188         if (_fields_type_annotations == NULL) {
1189           _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1190                                                   _loader_data, length, NULL,
1191                                                   CHECK_NULL);
1192         }
1193         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1194         parsed_annotations.set_field_type_annotations(NULL);
1195       }
1196 
1197       if (is_synthetic) {
1198         access_flags.set_is_synthetic();
1199       }
1200       if (generic_signature_index != 0) {
1201         access_flags.set_field_has_generic_signature();
1202         fa[generic_signature_slot] = generic_signature_index;
1203         generic_signature_slot ++;
1204         num_generic_signature ++;
1205       }
1206     }
1207 
1208     FieldInfo* field = FieldInfo::from_field_array(fa, n);
1209     field->initialize(access_flags.as_short(),
1210                       name_index,
1211                       signature_index,
1212                       constantvalue_index);
1213     BasicType type = _cp->basic_type_for_signature_at(signature_index);
1214 
1215     // Remember how many oops we encountered and compute allocation type
1216     FieldAllocationType atype = fac->update(is_static, type);
1217     field->set_allocation_type(atype);
1218 
1219     // After field is initialized with type, we can augment it with aux info
1220     if (parsed_annotations.has_any_annotations())
1221       parsed_annotations.apply_to(field);
1222   }
1223 
1224   int index = length;
1225   if (num_injected != 0) {
1226     for (int n = 0; n < num_injected; n++) {
1227       // Check for duplicates
1228       if (injected[n].may_be_java) {
1229         Symbol* name      = injected[n].name();
1230         Symbol* signature = injected[n].signature();
1231         bool duplicate = false;
1232         for (int i = 0; i < length; i++) {
1233           FieldInfo* f = FieldInfo::from_field_array(fa, i);
1234           if (name      == _cp->symbol_at(f->name_index()) &&
1235               signature == _cp->symbol_at(f->signature_index())) {
1236             // Symbol is desclared in Java so skip this one
1237             duplicate = true;
1238             break;
1239           }
1240         }
1241         if (duplicate) {
1242           // These will be removed from the field array at the end
1243           continue;
1244         }
1245       }
1246 
1247       // Injected field
1248       FieldInfo* field = FieldInfo::from_field_array(fa, index);
1249       field->initialize(JVM_ACC_FIELD_INTERNAL,
1250                         injected[n].name_index,
1251                         injected[n].signature_index,
1252                         0);
1253 
1254       BasicType type = FieldType::basic_type(injected[n].signature());
1255 
1256       // Remember how many oops we encountered and compute allocation type
1257       FieldAllocationType atype = fac->update(false, type);
1258       field->set_allocation_type(atype);
1259       index++;
1260     }
1261   }
1262 
1263   // Now copy the fields' data from the temporary resource array.
1264   // Sometimes injected fields already exist in the Java source so
1265   // the fields array could be too long.  In that case the
1266   // fields array is trimed. Also unused slots that were reserved
1267   // for generic signature indexes are discarded.
1268   Array<u2>* fields = MetadataFactory::new_array<u2>(
1269           _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1270           CHECK_NULL);
1271   _fields = fields; // save in case of error
1272   {
1273     int i = 0;
1274     for (; i < index * FieldInfo::field_slots; i++) {
1275       fields->at_put(i, fa[i]);
1276     }
1277     for (int j = total_fields * FieldInfo::field_slots;
1278          j < generic_signature_slot; j++) {
1279       fields->at_put(i++, fa[j]);
1280     }
1281     assert(i == fields->length(), "");
1282   }
1283 
1284   if (_need_verify && length > 1) {
1285     // Check duplicated fields
1286     ResourceMark rm(THREAD);
1287     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1288       THREAD, NameSigHash*, HASH_ROW_SIZE);
1289     initialize_hashtable(names_and_sigs);
1290     bool dup = false;
1291     {
1292       debug_only(No_Safepoint_Verifier nsv;)
1293       for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1294         Symbol* name = fs.name();
1295         Symbol* sig = fs.signature();
1296         // If no duplicates, add name/signature in hashtable names_and_sigs.
1297         if (!put_after_lookup(name, sig, names_and_sigs)) {
1298           dup = true;
1299           break;
1300         }
1301       }
1302     }
1303     if (dup) {
1304       classfile_parse_error("Duplicate field name&signature in class file %s",
1305                             CHECK_NULL);
1306     }
1307   }
1308 
1309   return fields;
1310 }
1311 
1312 
1313 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1314   while (length-- > 0) {
1315     *dest++ = Bytes::get_Java_u2((u1*) (src++));
1316   }
1317 }
1318 
1319 
1320 u2* ClassFileParser::parse_exception_table(u4 code_length,
1321                                            u4 exception_table_length,
1322                                            TRAPS) {
1323   ClassFileStream* cfs = stream();
1324 
1325   u2* exception_table_start = cfs->get_u2_buffer();
1326   assert(exception_table_start != NULL, "null exception table");
1327   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1328   // Will check legal target after parsing code array in verifier.
1329   if (_need_verify) {
1330     for (unsigned int i = 0; i < exception_table_length; i++) {
1331       u2 start_pc = cfs->get_u2_fast();
1332       u2 end_pc = cfs->get_u2_fast();
1333       u2 handler_pc = cfs->get_u2_fast();
1334       u2 catch_type_index = cfs->get_u2_fast();
1335       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1336                          "Illegal exception table range in class file %s",
1337                          CHECK_NULL);
1338       guarantee_property(handler_pc < code_length,
1339                          "Illegal exception table handler in class file %s",
1340                          CHECK_NULL);
1341       if (catch_type_index != 0) {
1342         guarantee_property(valid_klass_reference_at(catch_type_index),
1343                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1344       }
1345     }
1346   } else {
1347     cfs->skip_u2_fast(exception_table_length * 4);
1348   }
1349   return exception_table_start;
1350 }
1351 
1352 void ClassFileParser::parse_linenumber_table(
1353     u4 code_attribute_length, u4 code_length,
1354     CompressedLineNumberWriteStream** write_stream, TRAPS) {
1355   ClassFileStream* cfs = stream();
1356   unsigned int num_entries = cfs->get_u2(CHECK);
1357 
1358   // Each entry is a u2 start_pc, and a u2 line_number
1359   unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1360 
1361   // Verify line number attribute and table length
1362   check_property(
1363     code_attribute_length == sizeof(u2) + length_in_bytes,
1364     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1365 
1366   cfs->guarantee_more(length_in_bytes, CHECK);
1367 
1368   if ((*write_stream) == NULL) {
1369     if (length_in_bytes > fixed_buffer_size) {
1370       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1371     } else {
1372       (*write_stream) = new CompressedLineNumberWriteStream(
1373         linenumbertable_buffer, fixed_buffer_size);
1374     }
1375   }
1376 
1377   while (num_entries-- > 0) {
1378     u2 bci  = cfs->get_u2_fast(); // start_pc
1379     u2 line = cfs->get_u2_fast(); // line_number
1380     guarantee_property(bci < code_length,
1381         "Invalid pc in LineNumberTable in class file %s", CHECK);
1382     (*write_stream)->write_pair(bci, line);
1383   }
1384 }
1385 
1386 
1387 class LVT_Hash : public AllStatic {
1388  public:
1389 
1390   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1391   /*
1392    * 3-tuple start_bci/length/slot has to be unique key,
1393    * so the following comparison seems to be redundant:
1394    *       && elem->name_cp_index == entry->_elem->name_cp_index
1395    */
1396     return (e0.start_bci     == e1.start_bci &&
1397             e0.length        == e1.length &&
1398             e0.name_cp_index == e1.name_cp_index &&
1399             e0.slot          == e1.slot);
1400   }
1401 
1402   static unsigned int hash(LocalVariableTableElement const& e0) {
1403     unsigned int raw_hash = e0.start_bci;
1404 
1405     raw_hash = e0.length        + raw_hash * 37;
1406     raw_hash = e0.name_cp_index + raw_hash * 37;
1407     raw_hash = e0.slot          + raw_hash * 37;
1408 
1409     return raw_hash;
1410   }
1411 };
1412 
1413 
1414 // Class file LocalVariableTable elements.
1415 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1416  public:
1417   u2 start_bci;
1418   u2 length;
1419   u2 name_cp_index;
1420   u2 descriptor_cp_index;
1421   u2 slot;
1422 };
1423 
1424 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1425   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1426   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1427   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1428   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1429   lvt->signature_cp_index  = 0;
1430   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1431 }
1432 
1433 // Function is used to parse both attributes:
1434 //       LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1435 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1436                                                u2 max_locals,
1437                                                u4 code_attribute_length,
1438                                                u2* localvariable_table_length,
1439                                                bool isLVTT,
1440                                                TRAPS) {
1441   ClassFileStream* cfs = stream();
1442   const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1443   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1444   unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1445   // Verify local variable table attribute has right length
1446   if (_need_verify) {
1447     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1448                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1449   }
1450   u2* localvariable_table_start = cfs->get_u2_buffer();
1451   assert(localvariable_table_start != NULL, "null local variable table");
1452   if (!_need_verify) {
1453     cfs->skip_u2_fast(size);
1454   } else {
1455     cfs->guarantee_more(size * 2, CHECK_NULL);
1456     for(int i = 0; i < (*localvariable_table_length); i++) {
1457       u2 start_pc = cfs->get_u2_fast();
1458       u2 length = cfs->get_u2_fast();
1459       u2 name_index = cfs->get_u2_fast();
1460       u2 descriptor_index = cfs->get_u2_fast();
1461       u2 index = cfs->get_u2_fast();
1462       // Assign to a u4 to avoid overflow
1463       u4 end_pc = (u4)start_pc + (u4)length;
1464 
1465       if (start_pc >= code_length) {
1466         classfile_parse_error(
1467           "Invalid start_pc %u in %s in class file %s",
1468           start_pc, tbl_name, CHECK_NULL);
1469       }
1470       if (end_pc > code_length) {
1471         classfile_parse_error(
1472           "Invalid length %u in %s in class file %s",
1473           length, tbl_name, CHECK_NULL);
1474       }
1475       int cp_size = _cp->length();
1476       guarantee_property(valid_symbol_at(name_index),
1477         "Name index %u in %s has bad constant type in class file %s",
1478         name_index, tbl_name, CHECK_NULL);
1479       guarantee_property(valid_symbol_at(descriptor_index),
1480         "Signature index %u in %s has bad constant type in class file %s",
1481         descriptor_index, tbl_name, CHECK_NULL);
1482 
1483       Symbol*  name = _cp->symbol_at(name_index);
1484       Symbol*  sig = _cp->symbol_at(descriptor_index);
1485       verify_legal_field_name(name, CHECK_NULL);
1486       u2 extra_slot = 0;
1487       if (!isLVTT) {
1488         verify_legal_field_signature(name, sig, CHECK_NULL);
1489 
1490         // 4894874: check special cases for double and long local variables
1491         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1492             sig == vmSymbols::type_signature(T_LONG)) {
1493           extra_slot = 1;
1494         }
1495       }
1496       guarantee_property((index + extra_slot) < max_locals,
1497                           "Invalid index %u in %s in class file %s",
1498                           index, tbl_name, CHECK_NULL);
1499     }
1500   }
1501   return localvariable_table_start;
1502 }
1503 
1504 
1505 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1506                                       u1* u1_array, u2* u2_array, TRAPS) {
1507   ClassFileStream* cfs = stream();
1508   u2 index = 0; // index in the array with long/double occupying two slots
1509   u4 i1 = *u1_index;
1510   u4 i2 = *u2_index + 1;
1511   for(int i = 0; i < array_length; i++) {
1512     u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1513     index++;
1514     if (tag == ITEM_Long || tag == ITEM_Double) {
1515       index++;
1516     } else if (tag == ITEM_Object) {
1517       u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1518       guarantee_property(valid_klass_reference_at(class_index),
1519                          "Bad class index %u in StackMap in class file %s",
1520                          class_index, CHECK);
1521     } else if (tag == ITEM_Uninitialized) {
1522       u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1523       guarantee_property(
1524         offset < code_length,
1525         "Bad uninitialized type offset %u in StackMap in class file %s",
1526         offset, CHECK);
1527     } else {
1528       guarantee_property(
1529         tag <= (u1)ITEM_Uninitialized,
1530         "Unknown variable type %u in StackMap in class file %s",
1531         tag, CHECK);
1532     }
1533   }
1534   u2_array[*u2_index] = index;
1535   *u1_index = i1;
1536   *u2_index = i2;
1537 }
1538 
1539 u1* ClassFileParser::parse_stackmap_table(
1540     u4 code_attribute_length, TRAPS) {
1541   if (code_attribute_length == 0)
1542     return NULL;
1543 
1544   ClassFileStream* cfs = stream();
1545   u1* stackmap_table_start = cfs->get_u1_buffer();
1546   assert(stackmap_table_start != NULL, "null stackmap table");
1547 
1548   // check code_attribute_length first
1549   stream()->skip_u1(code_attribute_length, CHECK_NULL);
1550 
1551   if (!_need_verify && !DumpSharedSpaces) {
1552     return NULL;
1553   }
1554   return stackmap_table_start;
1555 }
1556 
1557 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1558                                               u4 method_attribute_length,
1559                                               TRAPS) {
1560   ClassFileStream* cfs = stream();
1561   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1562   *checked_exceptions_length = cfs->get_u2_fast();
1563   unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1564   u2* checked_exceptions_start = cfs->get_u2_buffer();
1565   assert(checked_exceptions_start != NULL, "null checked exceptions");
1566   if (!_need_verify) {
1567     cfs->skip_u2_fast(size);
1568   } else {
1569     // Verify each value in the checked exception table
1570     u2 checked_exception;
1571     u2 len = *checked_exceptions_length;
1572     cfs->guarantee_more(2 * len, CHECK_NULL);
1573     for (int i = 0; i < len; i++) {
1574       checked_exception = cfs->get_u2_fast();
1575       check_property(
1576         valid_klass_reference_at(checked_exception),
1577         "Exception name has bad type at constant pool %u in class file %s",
1578         checked_exception, CHECK_NULL);
1579     }
1580   }
1581   // check exceptions attribute length
1582   if (_need_verify) {
1583     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1584                                                    sizeof(u2) * size),
1585                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1586   }
1587   return checked_exceptions_start;
1588 }
1589 
1590 void ClassFileParser::throwIllegalSignature(
1591     const char* type, Symbol* name, Symbol* sig, TRAPS) {
1592   ResourceMark rm(THREAD);
1593   Exceptions::fthrow(THREAD_AND_LOCATION,
1594       vmSymbols::java_lang_ClassFormatError(),
1595       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1596       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1597 }
1598 
1599 // Skip an annotation.  Return >=limit if there is any problem.
1600 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1601   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1602   // value := switch (tag:u1) { ... }
1603   index += 2;  // skip atype
1604   if ((index += 2) >= limit)  return limit;  // read nmem
1605   int nmem = Bytes::get_Java_u2(buffer+index-2);
1606   while (--nmem >= 0 && index < limit) {
1607     index += 2; // skip member
1608     index = skip_annotation_value(buffer, limit, index);
1609   }
1610   return index;
1611 }
1612 
1613 // Skip an annotation value.  Return >=limit if there is any problem.
1614 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1615   // value := switch (tag:u1) {
1616   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1617   //   case e: e_class:u2 e_name:u2;
1618   //   case s: s_con:u2;
1619   //   case [: do(nval:u2) {value};
1620   //   case @: annotation;
1621   //   case s: s_con:u2;
1622   // }
1623   if ((index += 1) >= limit)  return limit;  // read tag
1624   u1 tag = buffer[index-1];
1625   switch (tag) {
1626   case 'B': case 'C': case 'I': case 'S': case 'Z':
1627   case 'D': case 'F': case 'J': case 'c': case 's':
1628     index += 2;  // skip con or s_con
1629     break;
1630   case 'e':
1631     index += 4;  // skip e_class, e_name
1632     break;
1633   case '[':
1634     {
1635       if ((index += 2) >= limit)  return limit;  // read nval
1636       int nval = Bytes::get_Java_u2(buffer+index-2);
1637       while (--nval >= 0 && index < limit) {
1638         index = skip_annotation_value(buffer, limit, index);
1639       }
1640     }
1641     break;
1642   case '@':
1643     index = skip_annotation(buffer, limit, index);
1644     break;
1645   default:
1646     assert(false, "annotation tag");
1647     return limit;  //  bad tag byte
1648   }
1649   return index;
1650 }
1651 
1652 // Sift through annotations, looking for those significant to the VM:
1653 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1654                                         ClassFileParser::AnnotationCollector* coll,
1655                                         TRAPS) {
1656   // annotations := do(nann:u2) {annotation}
1657   int index = 0;
1658   if ((index += 2) >= limit)  return;  // read nann
1659   int nann = Bytes::get_Java_u2(buffer+index-2);
1660   enum {  // initial annotation layout
1661     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1662     count_off = 2,      // u2   such as 1 (one value)
1663     member_off = 4,     // utf8 such as 'value'
1664     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1665     e_tag_val = 'e',
1666       e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1667       e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1668       e_size = 11,     // end of 'e' annotation
1669     c_tag_val = 'c',    // payload is type
1670       c_con_off = 7,    // utf8 payload, such as 'I'
1671       c_size = 9,       // end of 'c' annotation
1672     s_tag_val = 's',    // payload is String
1673       s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1674       s_size = 9,
1675     min_size = 6        // smallest possible size (zero members)
1676   };
1677   while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1678     int index0 = index;
1679     index = skip_annotation(buffer, limit, index);
1680     u1* abase = buffer + index0;
1681     int atype = Bytes::get_Java_u2(abase + atype_off);
1682     int count = Bytes::get_Java_u2(abase + count_off);
1683     Symbol* aname = check_symbol_at(_cp, atype);
1684     if (aname == NULL)  break;  // invalid annotation name
1685     Symbol* member = NULL;
1686     if (count >= 1) {
1687       int member_index = Bytes::get_Java_u2(abase + member_off);
1688       member = check_symbol_at(_cp, member_index);
1689       if (member == NULL)  break;  // invalid member name
1690     }
1691 
1692     // Here is where parsing particular annotations will take place.
1693     AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1694     if (id == AnnotationCollector::_unknown)  continue;
1695     coll->set_annotation(id);
1696 
1697     if (id == AnnotationCollector::_sun_misc_Contended) {
1698       // @Contended can optionally specify the contention group.
1699       //
1700       // Contended group defines the equivalence class over the fields:
1701       // the fields within the same contended group are not treated distinct.
1702       // The only exception is default group, which does not incur the
1703       // equivalence. Naturally, contention group for classes is meaningless.
1704       //
1705       // While the contention group is specified as String, annotation
1706       // values are already interned, and we might as well use the constant
1707       // pool index as the group tag.
1708       //
1709       u2 group_index = 0; // default contended group
1710       if (count == 1
1711           && s_size == (index - index0)  // match size
1712           && s_tag_val == *(abase + tag_off)
1713           && member == vmSymbols::value_name()) {
1714         group_index = Bytes::get_Java_u2(abase + s_con_off);
1715         if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1716           group_index = 0; // default contended group
1717         }
1718       }
1719       coll->set_contended_group(group_index);
1720     }
1721   }
1722 }
1723 
1724 ClassFileParser::AnnotationCollector::ID
1725 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1726                                                                 Symbol* name) {
1727   vmSymbols::SID sid = vmSymbols::find_sid(name);
1728   // Privileged code can use all annotations.  Other code silently drops some.
1729   const bool privileged = loader_data->is_the_null_class_loader_data() ||
1730                           loader_data->is_ext_class_loader_data() ||
1731                           loader_data->is_anonymous();
1732   switch (sid) {
1733   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1734     if (_location != _in_method)  break;  // only allow for methods
1735     if (!privileged)              break;  // only allow in privileged code
1736     return _method_CallerSensitive;
1737   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1738     if (_location != _in_method)  break;  // only allow for methods
1739     if (!privileged)              break;  // only allow in privileged code
1740     return _method_ForceInline;
1741   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1742     if (_location != _in_method)  break;  // only allow for methods
1743     if (!privileged)              break;  // only allow in privileged code
1744     return _method_DontInline;
1745   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1746     if (_location != _in_method)  break;  // only allow for methods
1747     if (!privileged)              break;  // only allow in privileged code
1748     return _method_LambdaForm_Compiled;
1749   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1750     if (_location != _in_method)  break;  // only allow for methods
1751     if (!privileged)              break;  // only allow in privileged code
1752     return _method_LambdaForm_Hidden;
1753   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1754     if (_location != _in_field)   break;  // only allow for fields
1755     if (!privileged)              break;  // only allow in privileged code
1756     return _field_Stable;
1757   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1758     if (_location != _in_field && _location != _in_class)          break;  // only allow for fields and classes
1759     if (!EnableContended || (RestrictContended && !privileged))    break;  // honor privileges
1760     return _sun_misc_Contended;
1761   default: break;
1762   }
1763   return AnnotationCollector::_unknown;
1764 }
1765 
1766 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1767   if (is_contended())
1768     f->set_contended_group(contended_group());
1769   if (is_stable())
1770     f->set_stable(true);
1771 }
1772 
1773 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1774   // If there's an error deallocate metadata for field annotations
1775   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1776   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1777 }
1778 
1779 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1780   if (has_annotation(_method_CallerSensitive))
1781     m->set_caller_sensitive(true);
1782   if (has_annotation(_method_ForceInline))
1783     m->set_force_inline(true);
1784   if (has_annotation(_method_DontInline))
1785     m->set_dont_inline(true);
1786   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1787     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1788   if (has_annotation(_method_LambdaForm_Hidden))
1789     m->set_hidden(true);
1790 }
1791 
1792 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1793   k->set_is_contended(is_contended());
1794 }
1795 
1796 
1797 #define MAX_ARGS_SIZE 255
1798 #define MAX_CODE_SIZE 65535
1799 #define INITIAL_MAX_LVT_NUMBER 256
1800 
1801 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1802  *
1803  * Rules for LVT's and LVTT's are:
1804  *   - There can be any number of LVT's and LVTT's.
1805  *   - If there are n LVT's, it is the same as if there was just
1806  *     one LVT containing all the entries from the n LVT's.
1807  *   - There may be no more than one LVT entry per local variable.
1808  *     Two LVT entries are 'equal' if these fields are the same:
1809  *        start_pc, length, name, slot
1810  *   - There may be no more than one LVTT entry per each LVT entry.
1811  *     Each LVTT entry has to match some LVT entry.
1812  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1813  */
1814 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1815                                                int lvt_cnt,
1816                                                u2* localvariable_table_length,
1817                                                u2** localvariable_table_start,
1818                                                int lvtt_cnt,
1819                                                u2* localvariable_type_table_length,
1820                                                u2** localvariable_type_table_start,
1821                                                TRAPS) {
1822 
1823   ResourceMark rm(THREAD);
1824 
1825   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1826                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1827 
1828   LVT_HashTable* table = new LVT_HashTable();
1829 
1830   // To fill LocalVariableTable in
1831   Classfile_LVT_Element*  cf_lvt;
1832   LocalVariableTableElement* lvt = cm->localvariable_table_start();
1833 
1834   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1835     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1836     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1837       copy_lvt_element(&cf_lvt[idx], lvt);
1838       // If no duplicates, add LVT elem in hashtable.
1839       if (table->put(*lvt, lvt) == false
1840           && _need_verify
1841           && _major_version >= JAVA_1_5_VERSION) {
1842         classfile_parse_error("Duplicated LocalVariableTable attribute "
1843                               "entry for '%s' in class file %s",
1844                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1845                                CHECK);
1846       }
1847     }
1848   }
1849 
1850   // To merge LocalVariableTable and LocalVariableTypeTable
1851   Classfile_LVT_Element* cf_lvtt;
1852   LocalVariableTableElement lvtt_elem;
1853 
1854   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1855     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1856     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1857       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1858       LocalVariableTableElement** entry = table->get(lvtt_elem);
1859       if (entry == NULL) {
1860         if (_need_verify) {
1861           classfile_parse_error("LVTT entry for '%s' in class file %s "
1862                                 "does not match any LVT entry",
1863                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1864                                  CHECK);
1865         }
1866       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1867         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1868                               "entry for '%s' in class file %s",
1869                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1870                                CHECK);
1871       } else {
1872         // to add generic signatures into LocalVariableTable
1873         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1874       }
1875     }
1876   }
1877 }
1878 
1879 
1880 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1881                                        u1* runtime_visible_annotations,
1882                                        int runtime_visible_annotations_length,
1883                                        u1* runtime_invisible_annotations,
1884                                        int runtime_invisible_annotations_length,
1885                                        u1* runtime_visible_parameter_annotations,
1886                                        int runtime_visible_parameter_annotations_length,
1887                                        u1* runtime_invisible_parameter_annotations,
1888                                        int runtime_invisible_parameter_annotations_length,
1889                                        u1* runtime_visible_type_annotations,
1890                                        int runtime_visible_type_annotations_length,
1891                                        u1* runtime_invisible_type_annotations,
1892                                        int runtime_invisible_type_annotations_length,
1893                                        u1* annotation_default,
1894                                        int annotation_default_length,
1895                                        TRAPS) {
1896 
1897   AnnotationArray* a;
1898 
1899   if (runtime_visible_annotations_length +
1900       runtime_invisible_annotations_length > 0) {
1901      a = assemble_annotations(runtime_visible_annotations,
1902                               runtime_visible_annotations_length,
1903                               runtime_invisible_annotations,
1904                               runtime_invisible_annotations_length,
1905                               CHECK);
1906      cm->set_method_annotations(a);
1907   }
1908 
1909   if (runtime_visible_parameter_annotations_length +
1910       runtime_invisible_parameter_annotations_length > 0) {
1911     a = assemble_annotations(runtime_visible_parameter_annotations,
1912                              runtime_visible_parameter_annotations_length,
1913                              runtime_invisible_parameter_annotations,
1914                              runtime_invisible_parameter_annotations_length,
1915                              CHECK);
1916     cm->set_parameter_annotations(a);
1917   }
1918 
1919   if (annotation_default_length > 0) {
1920     a = assemble_annotations(annotation_default,
1921                              annotation_default_length,
1922                              NULL,
1923                              0,
1924                              CHECK);
1925     cm->set_default_annotations(a);
1926   }
1927 
1928   if (runtime_visible_type_annotations_length +
1929       runtime_invisible_type_annotations_length > 0) {
1930     a = assemble_annotations(runtime_visible_type_annotations,
1931                              runtime_visible_type_annotations_length,
1932                              runtime_invisible_type_annotations,
1933                              runtime_invisible_type_annotations_length,
1934                              CHECK);
1935     cm->set_type_annotations(a);
1936   }
1937 }
1938 
1939 
1940 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1941 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1942 // Method* to save footprint, so we only know the size of the resulting Method* when the
1943 // entire method attribute is parsed.
1944 //
1945 // The promoted_flags parameter is used to pass relevant access_flags
1946 // from the method back up to the containing klass. These flag values
1947 // are added to klass's access_flags.
1948 
1949 methodHandle ClassFileParser::parse_method(bool is_interface,
1950                                            AccessFlags *promoted_flags,
1951                                            TRAPS) {
1952   ClassFileStream* cfs = stream();
1953   methodHandle nullHandle;
1954   ResourceMark rm(THREAD);
1955   // Parse fixed parts
1956   cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1957 
1958   int flags = cfs->get_u2_fast();
1959   u2 name_index = cfs->get_u2_fast();
1960   int cp_size = _cp->length();
1961   check_property(
1962     valid_symbol_at(name_index),
1963     "Illegal constant pool index %u for method name in class file %s",
1964     name_index, CHECK_(nullHandle));
1965   Symbol*  name = _cp->symbol_at(name_index);
1966   verify_legal_method_name(name, CHECK_(nullHandle));
1967 
1968   u2 signature_index = cfs->get_u2_fast();
1969   guarantee_property(
1970     valid_symbol_at(signature_index),
1971     "Illegal constant pool index %u for method signature in class file %s",
1972     signature_index, CHECK_(nullHandle));
1973   Symbol*  signature = _cp->symbol_at(signature_index);
1974 
1975   AccessFlags access_flags;
1976   if (name == vmSymbols::class_initializer_name()) {
1977     // We ignore the other access flags for a valid class initializer.
1978     // (JVM Spec 2nd ed., chapter 4.6)
1979     if (_major_version < 51) { // backward compatibility
1980       flags = JVM_ACC_STATIC;
1981     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1982       flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1983     }
1984   } else {
1985     verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1986   }
1987 
1988   int args_size = -1;  // only used when _need_verify is true
1989   if (_need_verify) {
1990     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
1991                  verify_legal_method_signature(name, signature, CHECK_(nullHandle));
1992     if (args_size > MAX_ARGS_SIZE) {
1993       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
1994     }
1995   }
1996 
1997   access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
1998 
1999   // Default values for code and exceptions attribute elements
2000   u2 max_stack = 0;
2001   u2 max_locals = 0;
2002   u4 code_length = 0;
2003   u1* code_start = 0;
2004   u2 exception_table_length = 0;
2005   u2* exception_table_start = NULL;
2006   Array<int>* exception_handlers = Universe::the_empty_int_array();
2007   u2 checked_exceptions_length = 0;
2008   u2* checked_exceptions_start = NULL;
2009   CompressedLineNumberWriteStream* linenumber_table = NULL;
2010   int linenumber_table_length = 0;
2011   int total_lvt_length = 0;
2012   u2 lvt_cnt = 0;
2013   u2 lvtt_cnt = 0;
2014   bool lvt_allocated = false;
2015   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2016   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2017   u2* localvariable_table_length;
2018   u2** localvariable_table_start;
2019   u2* localvariable_type_table_length;
2020   u2** localvariable_type_table_start;
2021   int method_parameters_length = -1;
2022   u1* method_parameters_data = NULL;
2023   bool method_parameters_seen = false;
2024   bool parsed_code_attribute = false;
2025   bool parsed_checked_exceptions_attribute = false;
2026   bool parsed_stackmap_attribute = false;
2027   // stackmap attribute - JDK1.5
2028   u1* stackmap_data = NULL;
2029   int stackmap_data_length = 0;
2030   u2 generic_signature_index = 0;
2031   MethodAnnotationCollector parsed_annotations;
2032   u1* runtime_visible_annotations = NULL;
2033   int runtime_visible_annotations_length = 0;
2034   u1* runtime_invisible_annotations = NULL;
2035   int runtime_invisible_annotations_length = 0;
2036   u1* runtime_visible_parameter_annotations = NULL;
2037   int runtime_visible_parameter_annotations_length = 0;
2038   u1* runtime_invisible_parameter_annotations = NULL;
2039   int runtime_invisible_parameter_annotations_length = 0;
2040   u1* runtime_visible_type_annotations = NULL;
2041   int runtime_visible_type_annotations_length = 0;
2042   u1* runtime_invisible_type_annotations = NULL;
2043   int runtime_invisible_type_annotations_length = 0;
2044   bool runtime_invisible_annotations_exists = false;
2045   bool runtime_invisible_type_annotations_exists = false;
2046   bool runtime_invisible_parameter_annotations_exists = false;
2047   u1* annotation_default = NULL;
2048   int annotation_default_length = 0;
2049 
2050   // Parse code and exceptions attribute
2051   u2 method_attributes_count = cfs->get_u2_fast();
2052   while (method_attributes_count--) {
2053     cfs->guarantee_more(6, CHECK_(nullHandle));  // method_attribute_name_index, method_attribute_length
2054     u2 method_attribute_name_index = cfs->get_u2_fast();
2055     u4 method_attribute_length = cfs->get_u4_fast();
2056     check_property(
2057       valid_symbol_at(method_attribute_name_index),
2058       "Invalid method attribute name index %u in class file %s",
2059       method_attribute_name_index, CHECK_(nullHandle));
2060 
2061     Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2062     if (method_attribute_name == vmSymbols::tag_code()) {
2063       // Parse Code attribute
2064       if (_need_verify) {
2065         guarantee_property(
2066             !access_flags.is_native() && !access_flags.is_abstract(),
2067                         "Code attribute in native or abstract methods in class file %s",
2068                          CHECK_(nullHandle));
2069       }
2070       if (parsed_code_attribute) {
2071         classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2072       }
2073       parsed_code_attribute = true;
2074 
2075       // Stack size, locals size, and code size
2076       if (_major_version == 45 && _minor_version <= 2) {
2077         cfs->guarantee_more(4, CHECK_(nullHandle));
2078         max_stack = cfs->get_u1_fast();
2079         max_locals = cfs->get_u1_fast();
2080         code_length = cfs->get_u2_fast();
2081       } else {
2082         cfs->guarantee_more(8, CHECK_(nullHandle));
2083         max_stack = cfs->get_u2_fast();
2084         max_locals = cfs->get_u2_fast();
2085         code_length = cfs->get_u4_fast();
2086       }
2087       if (_need_verify) {
2088         guarantee_property(args_size <= max_locals,
2089                            "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2090         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2091                            "Invalid method Code length %u in class file %s",
2092                            code_length, CHECK_(nullHandle));
2093       }
2094       // Code pointer
2095       code_start = cfs->get_u1_buffer();
2096       assert(code_start != NULL, "null code start");
2097       cfs->guarantee_more(code_length, CHECK_(nullHandle));
2098       cfs->skip_u1_fast(code_length);
2099 
2100       // Exception handler table
2101       cfs->guarantee_more(2, CHECK_(nullHandle));  // exception_table_length
2102       exception_table_length = cfs->get_u2_fast();
2103       if (exception_table_length > 0) {
2104         exception_table_start =
2105               parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2106       }
2107 
2108       // Parse additional attributes in code attribute
2109       cfs->guarantee_more(2, CHECK_(nullHandle));  // code_attributes_count
2110       u2 code_attributes_count = cfs->get_u2_fast();
2111 
2112       unsigned int calculated_attribute_length = 0;
2113 
2114       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2115         calculated_attribute_length =
2116             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2117       } else {
2118         // max_stack, locals and length are smaller in pre-version 45.2 classes
2119         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2120       }
2121       calculated_attribute_length +=
2122         code_length +
2123         sizeof(exception_table_length) +
2124         sizeof(code_attributes_count) +
2125         exception_table_length *
2126             ( sizeof(u2) +   // start_pc
2127               sizeof(u2) +   // end_pc
2128               sizeof(u2) +   // handler_pc
2129               sizeof(u2) );  // catch_type_index
2130 
2131       while (code_attributes_count--) {
2132         cfs->guarantee_more(6, CHECK_(nullHandle));  // code_attribute_name_index, code_attribute_length
2133         u2 code_attribute_name_index = cfs->get_u2_fast();
2134         u4 code_attribute_length = cfs->get_u4_fast();
2135         calculated_attribute_length += code_attribute_length +
2136                                        sizeof(code_attribute_name_index) +
2137                                        sizeof(code_attribute_length);
2138         check_property(valid_symbol_at(code_attribute_name_index),
2139                        "Invalid code attribute name index %u in class file %s",
2140                        code_attribute_name_index,
2141                        CHECK_(nullHandle));
2142         if (LoadLineNumberTables &&
2143             _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2144           // Parse and compress line number table
2145           parse_linenumber_table(code_attribute_length, code_length,
2146             &linenumber_table, CHECK_(nullHandle));
2147 
2148         } else if (LoadLocalVariableTables &&
2149                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2150           // Parse local variable table
2151           if (!lvt_allocated) {
2152             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2153               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2154             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2155               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2156             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2157               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2158             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2159               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2160             lvt_allocated = true;
2161           }
2162           if (lvt_cnt == max_lvt_cnt) {
2163             max_lvt_cnt <<= 1;
2164             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2165             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2166           }
2167           localvariable_table_start[lvt_cnt] =
2168             parse_localvariable_table(code_length,
2169                                       max_locals,
2170                                       code_attribute_length,
2171                                       &localvariable_table_length[lvt_cnt],
2172                                       false,    // is not LVTT
2173                                       CHECK_(nullHandle));
2174           total_lvt_length += localvariable_table_length[lvt_cnt];
2175           lvt_cnt++;
2176         } else if (LoadLocalVariableTypeTables &&
2177                    _major_version >= JAVA_1_5_VERSION &&
2178                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2179           if (!lvt_allocated) {
2180             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2181               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2182             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2183               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2184             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2185               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2186             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2187               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2188             lvt_allocated = true;
2189           }
2190           // Parse local variable type table
2191           if (lvtt_cnt == max_lvtt_cnt) {
2192             max_lvtt_cnt <<= 1;
2193             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2194             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2195           }
2196           localvariable_type_table_start[lvtt_cnt] =
2197             parse_localvariable_table(code_length,
2198                                       max_locals,
2199                                       code_attribute_length,
2200                                       &localvariable_type_table_length[lvtt_cnt],
2201                                       true,     // is LVTT
2202                                       CHECK_(nullHandle));
2203           lvtt_cnt++;
2204         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2205                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2206           // Stack map is only needed by the new verifier in JDK1.5.
2207           if (parsed_stackmap_attribute) {
2208             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2209           }
2210           stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2211           stackmap_data_length = code_attribute_length;
2212           parsed_stackmap_attribute = true;
2213         } else {
2214           // Skip unknown attributes
2215           cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2216         }
2217       }
2218       // check method attribute length
2219       if (_need_verify) {
2220         guarantee_property(method_attribute_length == calculated_attribute_length,
2221                            "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2222       }
2223     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2224       // Parse Exceptions attribute
2225       if (parsed_checked_exceptions_attribute) {
2226         classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2227       }
2228       parsed_checked_exceptions_attribute = true;
2229       checked_exceptions_start =
2230             parse_checked_exceptions(&checked_exceptions_length,
2231                                      method_attribute_length,
2232                                      CHECK_(nullHandle));
2233     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2234       // reject multiple method parameters
2235       if (method_parameters_seen) {
2236         classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2237       }
2238       method_parameters_seen = true;
2239       method_parameters_length = cfs->get_u1_fast();
2240       const u2 real_length = (method_parameters_length * 4u) + 1u;
2241       if (method_attribute_length != real_length) {
2242         classfile_parse_error(
2243           "Invalid MethodParameters method attribute length %u in class file",
2244           method_attribute_length, CHECK_(nullHandle));
2245       }
2246       method_parameters_data = cfs->get_u1_buffer();
2247       cfs->skip_u2_fast(method_parameters_length);
2248       cfs->skip_u2_fast(method_parameters_length);
2249       // ignore this attribute if it cannot be reflected
2250       if (!SystemDictionary::Parameter_klass_loaded())
2251         method_parameters_length = -1;
2252     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2253       if (method_attribute_length != 0) {
2254         classfile_parse_error(
2255           "Invalid Synthetic method attribute length %u in class file %s",
2256           method_attribute_length, CHECK_(nullHandle));
2257       }
2258       // Should we check that there hasn't already been a synthetic attribute?
2259       access_flags.set_is_synthetic();
2260     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2261       if (method_attribute_length != 0) {
2262         classfile_parse_error(
2263           "Invalid Deprecated method attribute length %u in class file %s",
2264           method_attribute_length, CHECK_(nullHandle));
2265       }
2266     } else if (_major_version >= JAVA_1_5_VERSION) {
2267       if (method_attribute_name == vmSymbols::tag_signature()) {
2268         if (method_attribute_length != 2) {
2269           classfile_parse_error(
2270             "Invalid Signature attribute length %u in class file %s",
2271             method_attribute_length, CHECK_(nullHandle));
2272         }
2273         generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2274       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2275         if (runtime_visible_annotations != NULL) {
2276           classfile_parse_error(
2277             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2278         }
2279         runtime_visible_annotations_length = method_attribute_length;
2280         runtime_visible_annotations = cfs->get_u1_buffer();
2281         assert(runtime_visible_annotations != NULL, "null visible annotations");
2282         parse_annotations(runtime_visible_annotations,
2283             runtime_visible_annotations_length, &parsed_annotations,
2284             CHECK_(nullHandle));
2285         cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2286       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2287         if (runtime_invisible_annotations_exists) {
2288           classfile_parse_error(
2289             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2290         }
2291         runtime_invisible_annotations_exists = true;
2292         if (PreserveAllAnnotations) {
2293           runtime_invisible_annotations_length = method_attribute_length;
2294           runtime_invisible_annotations = cfs->get_u1_buffer();
2295           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2296         }
2297         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2298       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2299         if (runtime_visible_parameter_annotations != NULL) {
2300           classfile_parse_error(
2301             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2302         }
2303         runtime_visible_parameter_annotations_length = method_attribute_length;
2304         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2305         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2306         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2307       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2308         if (runtime_invisible_parameter_annotations_exists) {
2309           classfile_parse_error(
2310             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2311         }
2312         runtime_invisible_parameter_annotations_exists = true;
2313         if (PreserveAllAnnotations) {
2314           runtime_invisible_parameter_annotations_length = method_attribute_length;
2315           runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2316           assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2317         }
2318         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2319       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2320         if (annotation_default != NULL) {
2321           classfile_parse_error(
2322             "Multiple AnnotationDefault attributes for method in class file %s",
2323             CHECK_(nullHandle));
2324         }
2325         annotation_default_length = method_attribute_length;
2326         annotation_default = cfs->get_u1_buffer();
2327         assert(annotation_default != NULL, "null annotation default");
2328         cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2329       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2330         if (runtime_visible_type_annotations != NULL) {
2331           classfile_parse_error(
2332             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2333             CHECK_(nullHandle));
2334         }
2335         runtime_visible_type_annotations_length = method_attribute_length;
2336         runtime_visible_type_annotations = cfs->get_u1_buffer();
2337         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2338         // No need for the VM to parse Type annotations
2339         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2340       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2341         if (runtime_invisible_type_annotations_exists) {
2342           classfile_parse_error(
2343             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2344             CHECK_(nullHandle));
2345         } else {
2346           runtime_invisible_type_annotations_exists = true;
2347         }
2348         if (PreserveAllAnnotations) {
2349           runtime_invisible_type_annotations_length = method_attribute_length;
2350           runtime_invisible_type_annotations = cfs->get_u1_buffer();
2351           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2352         }
2353         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2354       } else {
2355         // Skip unknown attributes
2356         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2357       }
2358     } else {
2359       // Skip unknown attributes
2360       cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2361     }
2362   }
2363 
2364   if (linenumber_table != NULL) {
2365     linenumber_table->write_terminator();
2366     linenumber_table_length = linenumber_table->position();
2367   }
2368 
2369   // Make sure there's at least one Code attribute in non-native/non-abstract method
2370   if (_need_verify) {
2371     guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2372                       "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2373   }
2374 
2375   // All sizing information for a Method* is finally available, now create it
2376   InlineTableSizes sizes(
2377       total_lvt_length,
2378       linenumber_table_length,
2379       exception_table_length,
2380       checked_exceptions_length,
2381       method_parameters_length,
2382       generic_signature_index,
2383       runtime_visible_annotations_length +
2384            runtime_invisible_annotations_length,
2385       runtime_visible_parameter_annotations_length +
2386            runtime_invisible_parameter_annotations_length,
2387       runtime_visible_type_annotations_length +
2388            runtime_invisible_type_annotations_length,
2389       annotation_default_length,
2390       0);
2391 
2392   Method* m = Method::allocate(
2393       _loader_data, code_length, access_flags, &sizes,
2394       ConstMethod::NORMAL, CHECK_(nullHandle));
2395 
2396   ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2397 
2398   // Fill in information from fixed part (access_flags already set)
2399   m->set_constants(_cp);
2400   m->set_name_index(name_index);
2401   m->set_signature_index(signature_index);
2402 #ifdef CC_INTERP
2403   // hmm is there a gc issue here??
2404   ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2405   m->set_result_index(rtf.type());
2406 #endif
2407 
2408   if (args_size >= 0) {
2409     m->set_size_of_parameters(args_size);
2410   } else {
2411     m->compute_size_of_parameters(THREAD);
2412   }
2413 #ifdef ASSERT
2414   if (args_size >= 0) {
2415     m->compute_size_of_parameters(THREAD);
2416     assert(args_size == m->size_of_parameters(), "");
2417   }
2418 #endif
2419 
2420   // Fill in code attribute information
2421   m->set_max_stack(max_stack);
2422   m->set_max_locals(max_locals);
2423   if (stackmap_data != NULL) {
2424     m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2425                                          stackmap_data_length, CHECK_NULL);
2426   }
2427 
2428   // Copy byte codes
2429   m->set_code(code_start);
2430 
2431   // Copy line number table
2432   if (linenumber_table != NULL) {
2433     memcpy(m->compressed_linenumber_table(),
2434            linenumber_table->buffer(), linenumber_table_length);
2435   }
2436 
2437   // Copy exception table
2438   if (exception_table_length > 0) {
2439     int size =
2440       exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2441     copy_u2_with_conversion((u2*) m->exception_table_start(),
2442                              exception_table_start, size);
2443   }
2444 
2445   // Copy method parameters
2446   if (method_parameters_length > 0) {
2447     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2448     for (int i = 0; i < method_parameters_length; i++) {
2449       elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2450       method_parameters_data += 2;
2451       elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2452       method_parameters_data += 2;
2453     }
2454   }
2455 
2456   // Copy checked exceptions
2457   if (checked_exceptions_length > 0) {
2458     int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2459     copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2460   }
2461 
2462   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2463   if (total_lvt_length > 0) {
2464     promoted_flags->set_has_localvariable_table();
2465     copy_localvariable_table(m->constMethod(), lvt_cnt,
2466                              localvariable_table_length,
2467                              localvariable_table_start,
2468                              lvtt_cnt,
2469                              localvariable_type_table_length,
2470                              localvariable_type_table_start, CHECK_NULL);
2471   }
2472 
2473   if (parsed_annotations.has_any_annotations())
2474     parsed_annotations.apply_to(m);
2475 
2476   // Copy annotations
2477   copy_method_annotations(m->constMethod(),
2478                           runtime_visible_annotations,
2479                           runtime_visible_annotations_length,
2480                           runtime_invisible_annotations,
2481                           runtime_invisible_annotations_length,
2482                           runtime_visible_parameter_annotations,
2483                           runtime_visible_parameter_annotations_length,
2484                           runtime_invisible_parameter_annotations,
2485                           runtime_invisible_parameter_annotations_length,
2486                           runtime_visible_type_annotations,
2487                           runtime_visible_type_annotations_length,
2488                           runtime_invisible_type_annotations,
2489                           runtime_invisible_type_annotations_length,
2490                           annotation_default,
2491                           annotation_default_length,
2492                           CHECK_NULL);
2493 
2494   if (name == vmSymbols::finalize_method_name() &&
2495       signature == vmSymbols::void_method_signature()) {
2496     if (m->is_empty_method()) {
2497       _has_empty_finalizer = true;
2498     } else {
2499       _has_finalizer = true;
2500     }
2501   }
2502   if (name == vmSymbols::object_initializer_name() &&
2503       signature == vmSymbols::void_method_signature() &&
2504       m->is_vanilla_constructor()) {
2505     _has_vanilla_constructor = true;
2506   }
2507 
2508   NOT_PRODUCT(m->verify());
2509   return m;
2510 }
2511 
2512 
2513 // The promoted_flags parameter is used to pass relevant access_flags
2514 // from the methods back up to the containing klass. These flag values
2515 // are added to klass's access_flags.
2516 
2517 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2518                                                AccessFlags* promoted_flags,
2519                                                bool* has_final_method,
2520                                                bool* declares_default_methods,
2521                                                TRAPS) {
2522   ClassFileStream* cfs = stream();
2523   cfs->guarantee_more(2, CHECK_NULL);  // length
2524   u2 length = cfs->get_u2_fast();
2525   if (length == 0) {
2526     _methods = Universe::the_empty_method_array();
2527   } else {
2528     _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2529 
2530     HandleMark hm(THREAD);
2531     for (int index = 0; index < length; index++) {
2532       methodHandle method = parse_method(is_interface,
2533                                          promoted_flags,
2534                                          CHECK_NULL);
2535 
2536       if (method->is_final()) {
2537         *has_final_method = true;
2538       }
2539       // declares_default_methods: declares concrete instance methods, any access flags
2540       // used for interface initialization, and default method inheritance analysis
2541       if (is_interface && !(*declares_default_methods)
2542         && !method->is_abstract() && !method->is_static()) {
2543         *declares_default_methods = true;
2544       }
2545       _methods->at_put(index, method());
2546     }
2547 
2548     if (_need_verify && length > 1) {
2549       // Check duplicated methods
2550       ResourceMark rm(THREAD);
2551       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2552         THREAD, NameSigHash*, HASH_ROW_SIZE);
2553       initialize_hashtable(names_and_sigs);
2554       bool dup = false;
2555       {
2556         debug_only(No_Safepoint_Verifier nsv;)
2557         for (int i = 0; i < length; i++) {
2558           Method* m = _methods->at(i);
2559           // If no duplicates, add name/signature in hashtable names_and_sigs.
2560           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2561             dup = true;
2562             break;
2563           }
2564         }
2565       }
2566       if (dup) {
2567         classfile_parse_error("Duplicate method name&signature in class file %s",
2568                               CHECK_NULL);
2569       }
2570     }
2571   }
2572   return _methods;
2573 }
2574 
2575 
2576 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2577   int length = methods->length();
2578   // If JVMTI original method ordering or sharing is enabled we have to
2579   // remember the original class file ordering.
2580   // We temporarily use the vtable_index field in the Method* to store the
2581   // class file index, so we can read in after calling qsort.
2582   // Put the method ordering in the shared archive.
2583   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2584     for (int index = 0; index < length; index++) {
2585       Method* m = methods->at(index);
2586       assert(!m->valid_vtable_index(), "vtable index should not be set");
2587       m->set_vtable_index(index);
2588     }
2589   }
2590   // Sort method array by ascending method name (for faster lookups & vtable construction)
2591   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2592   Method::sort_methods(methods);
2593 
2594   intArray* method_ordering = NULL;
2595   // If JVMTI original method ordering or sharing is enabled construct int
2596   // array remembering the original ordering
2597   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2598     method_ordering = new intArray(length);
2599     for (int index = 0; index < length; index++) {
2600       Method* m = methods->at(index);
2601       int old_index = m->vtable_index();
2602       assert(old_index >= 0 && old_index < length, "invalid method index");
2603       method_ordering->at_put(index, old_index);
2604       m->set_vtable_index(Method::invalid_vtable_index);
2605     }
2606   }
2607   return method_ordering;
2608 }
2609 
2610 // Parse generic_signature attribute for methods and fields
2611 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2612   ClassFileStream* cfs = stream();
2613   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2614   u2 generic_signature_index = cfs->get_u2_fast();
2615   check_property(
2616     valid_symbol_at(generic_signature_index),
2617     "Invalid Signature attribute at constant pool index %u in class file %s",
2618     generic_signature_index, CHECK_0);
2619   return generic_signature_index;
2620 }
2621 
2622 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2623   ClassFileStream* cfs = stream();
2624   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2625   u2 sourcefile_index = cfs->get_u2_fast();
2626   check_property(
2627     valid_symbol_at(sourcefile_index),
2628     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2629     sourcefile_index, CHECK);
2630   set_class_sourcefile_index(sourcefile_index);
2631 }
2632 
2633 
2634 
2635 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2636   ClassFileStream* cfs = stream();
2637   u1* sde_buffer = cfs->get_u1_buffer();
2638   assert(sde_buffer != NULL, "null sde buffer");
2639 
2640   // Don't bother storing it if there is no way to retrieve it
2641   if (JvmtiExport::can_get_source_debug_extension()) {
2642     assert((length+1) > length, "Overflow checking");
2643     u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2644     for (int i = 0; i < length; i++) {
2645       sde[i] = sde_buffer[i];
2646     }
2647     sde[length] = '\0';
2648     set_class_sde_buffer((char*)sde, length);
2649   }
2650   // Got utf8 string, set stream position forward
2651   cfs->skip_u1(length, CHECK);
2652 }
2653 
2654 
2655 // Inner classes can be static, private or protected (classic VM does this)
2656 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2657 
2658 // Return number of classes in the inner classes attribute table
2659 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2660                                                             bool parsed_enclosingmethod_attribute,
2661                                                             u2 enclosing_method_class_index,
2662                                                             u2 enclosing_method_method_index,
2663                                                             TRAPS) {
2664   ClassFileStream* cfs = stream();
2665   u1* current_mark = cfs->current();
2666   u2 length = 0;
2667   if (inner_classes_attribute_start != NULL) {
2668     cfs->set_current(inner_classes_attribute_start);
2669     cfs->guarantee_more(2, CHECK_0);  // length
2670     length = cfs->get_u2_fast();
2671   }
2672 
2673   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2674   // method data:
2675   //   [inner_class_info_index,
2676   //    outer_class_info_index,
2677   //    inner_name_index,
2678   //    inner_class_access_flags,
2679   //    ...
2680   //    enclosing_method_class_index,
2681   //    enclosing_method_method_index]
2682   int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2683   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2684   _inner_classes = inner_classes;
2685 
2686   int index = 0;
2687   int cp_size = _cp->length();
2688   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
2689   for (int n = 0; n < length; n++) {
2690     // Inner class index
2691     u2 inner_class_info_index = cfs->get_u2_fast();
2692     check_property(
2693       inner_class_info_index == 0 ||
2694         valid_klass_reference_at(inner_class_info_index),
2695       "inner_class_info_index %u has bad constant type in class file %s",
2696       inner_class_info_index, CHECK_0);
2697     // Outer class index
2698     u2 outer_class_info_index = cfs->get_u2_fast();
2699     check_property(
2700       outer_class_info_index == 0 ||
2701         valid_klass_reference_at(outer_class_info_index),
2702       "outer_class_info_index %u has bad constant type in class file %s",
2703       outer_class_info_index, CHECK_0);
2704     // Inner class name
2705     u2 inner_name_index = cfs->get_u2_fast();
2706     check_property(
2707       inner_name_index == 0 || valid_symbol_at(inner_name_index),
2708       "inner_name_index %u has bad constant type in class file %s",
2709       inner_name_index, CHECK_0);
2710     if (_need_verify) {
2711       guarantee_property(inner_class_info_index != outer_class_info_index,
2712                          "Class is both outer and inner class in class file %s", CHECK_0);
2713     }
2714     // Access flags
2715     AccessFlags inner_access_flags;
2716     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2717     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2718       // Set abstract bit for old class files for backward compatibility
2719       flags |= JVM_ACC_ABSTRACT;
2720     }
2721     verify_legal_class_modifiers(flags, CHECK_0);
2722     inner_access_flags.set_flags(flags);
2723 
2724     inner_classes->at_put(index++, inner_class_info_index);
2725     inner_classes->at_put(index++, outer_class_info_index);
2726     inner_classes->at_put(index++, inner_name_index);
2727     inner_classes->at_put(index++, inner_access_flags.as_short());
2728   }
2729 
2730   // 4347400: make sure there's no duplicate entry in the classes array
2731   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2732     for(int i = 0; i < length * 4; i += 4) {
2733       for(int j = i + 4; j < length * 4; j += 4) {
2734         guarantee_property((inner_classes->at(i)   != inner_classes->at(j) ||
2735                             inner_classes->at(i+1) != inner_classes->at(j+1) ||
2736                             inner_classes->at(i+2) != inner_classes->at(j+2) ||
2737                             inner_classes->at(i+3) != inner_classes->at(j+3)),
2738                             "Duplicate entry in InnerClasses in class file %s",
2739                             CHECK_0);
2740       }
2741     }
2742   }
2743 
2744   // Set EnclosingMethod class and method indexes.
2745   if (parsed_enclosingmethod_attribute) {
2746     inner_classes->at_put(index++, enclosing_method_class_index);
2747     inner_classes->at_put(index++, enclosing_method_method_index);
2748   }
2749   assert(index == size, "wrong size");
2750 
2751   // Restore buffer's current position.
2752   cfs->set_current(current_mark);
2753 
2754   return length;
2755 }
2756 
2757 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2758   set_class_synthetic_flag(true);
2759 }
2760 
2761 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2762   ClassFileStream* cfs = stream();
2763   u2 signature_index = cfs->get_u2(CHECK);
2764   check_property(
2765     valid_symbol_at(signature_index),
2766     "Invalid constant pool index %u in Signature attribute in class file %s",
2767     signature_index, CHECK);
2768   set_class_generic_signature_index(signature_index);
2769 }
2770 
2771 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2772   ClassFileStream* cfs = stream();
2773   u1* current_start = cfs->current();
2774 
2775   guarantee_property(attribute_byte_length >= sizeof(u2),
2776                      "Invalid BootstrapMethods attribute length %u in class file %s",
2777                      attribute_byte_length,
2778                      CHECK);
2779 
2780   cfs->guarantee_more(attribute_byte_length, CHECK);
2781 
2782   int attribute_array_length = cfs->get_u2_fast();
2783 
2784   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2785                      "Short length on BootstrapMethods in class file %s",
2786                      CHECK);
2787 
2788 
2789   // The attribute contains a counted array of counted tuples of shorts,
2790   // represending bootstrap specifiers:
2791   //    length*{bootstrap_method_index, argument_count*{argument_index}}
2792   int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2793   // operand_count = number of shorts in attr, except for leading length
2794 
2795   // The attribute is copied into a short[] array.
2796   // The array begins with a series of short[2] pairs, one for each tuple.
2797   int index_size = (attribute_array_length * 2);
2798 
2799   Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2800 
2801   // Eagerly assign operands so they will be deallocated with the constant
2802   // pool if there is an error.
2803   _cp->set_operands(operands);
2804 
2805   int operand_fill_index = index_size;
2806   int cp_size = _cp->length();
2807 
2808   for (int n = 0; n < attribute_array_length; n++) {
2809     // Store a 32-bit offset into the header of the operand array.
2810     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2811 
2812     // Read a bootstrap specifier.
2813     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
2814     u2 bootstrap_method_index = cfs->get_u2_fast();
2815     u2 argument_count = cfs->get_u2_fast();
2816     check_property(
2817       valid_cp_range(bootstrap_method_index, cp_size) &&
2818       _cp->tag_at(bootstrap_method_index).is_method_handle(),
2819       "bootstrap_method_index %u has bad constant type in class file %s",
2820       bootstrap_method_index,
2821       CHECK);
2822 
2823     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2824       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2825       CHECK);
2826 
2827     operands->at_put(operand_fill_index++, bootstrap_method_index);
2828     operands->at_put(operand_fill_index++, argument_count);
2829 
2830     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
2831     for (int j = 0; j < argument_count; j++) {
2832       u2 argument_index = cfs->get_u2_fast();
2833       check_property(
2834         valid_cp_range(argument_index, cp_size) &&
2835         _cp->tag_at(argument_index).is_loadable_constant(),
2836         "argument_index %u has bad constant type in class file %s",
2837         argument_index,
2838         CHECK);
2839       operands->at_put(operand_fill_index++, argument_index);
2840     }
2841   }
2842 
2843   u1* current_end = cfs->current();
2844   guarantee_property(current_end == current_start + attribute_byte_length,
2845                      "Bad length on BootstrapMethods in class file %s",
2846                      CHECK);
2847 }
2848 
2849 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2850                                                  TRAPS) {
2851   ClassFileStream* cfs = stream();
2852   // Set inner classes attribute to default sentinel
2853   _inner_classes = Universe::the_empty_short_array();
2854   cfs->guarantee_more(2, CHECK);  // attributes_count
2855   u2 attributes_count = cfs->get_u2_fast();
2856   bool parsed_sourcefile_attribute = false;
2857   bool parsed_innerclasses_attribute = false;
2858   bool parsed_enclosingmethod_attribute = false;
2859   bool parsed_bootstrap_methods_attribute = false;
2860   u1* runtime_visible_annotations = NULL;
2861   int runtime_visible_annotations_length = 0;
2862   u1* runtime_invisible_annotations = NULL;
2863   int runtime_invisible_annotations_length = 0;
2864   u1* runtime_visible_type_annotations = NULL;
2865   int runtime_visible_type_annotations_length = 0;
2866   u1* runtime_invisible_type_annotations = NULL;
2867   int runtime_invisible_type_annotations_length = 0;
2868   bool runtime_invisible_type_annotations_exists = false;
2869   bool runtime_invisible_annotations_exists = false;
2870   bool parsed_source_debug_ext_annotations_exist = false;
2871   u1* inner_classes_attribute_start = NULL;
2872   u4  inner_classes_attribute_length = 0;
2873   u2  enclosing_method_class_index = 0;
2874   u2  enclosing_method_method_index = 0;
2875   // Iterate over attributes
2876   while (attributes_count--) {
2877     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
2878     u2 attribute_name_index = cfs->get_u2_fast();
2879     u4 attribute_length = cfs->get_u4_fast();
2880     check_property(
2881       valid_symbol_at(attribute_name_index),
2882       "Attribute name has bad constant pool index %u in class file %s",
2883       attribute_name_index, CHECK);
2884     Symbol* tag = _cp->symbol_at(attribute_name_index);
2885     if (tag == vmSymbols::tag_source_file()) {
2886       // Check for SourceFile tag
2887       if (_need_verify) {
2888         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2889       }
2890       if (parsed_sourcefile_attribute) {
2891         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2892       } else {
2893         parsed_sourcefile_attribute = true;
2894       }
2895       parse_classfile_sourcefile_attribute(CHECK);
2896     } else if (tag == vmSymbols::tag_source_debug_extension()) {
2897       // Check for SourceDebugExtension tag
2898       if (parsed_source_debug_ext_annotations_exist) {
2899           classfile_parse_error(
2900             "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2901       }
2902       parsed_source_debug_ext_annotations_exist = true;
2903       parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2904     } else if (tag == vmSymbols::tag_inner_classes()) {
2905       // Check for InnerClasses tag
2906       if (parsed_innerclasses_attribute) {
2907         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2908       } else {
2909         parsed_innerclasses_attribute = true;
2910       }
2911       inner_classes_attribute_start = cfs->get_u1_buffer();
2912       inner_classes_attribute_length = attribute_length;
2913       cfs->skip_u1(inner_classes_attribute_length, CHECK);
2914     } else if (tag == vmSymbols::tag_synthetic()) {
2915       // Check for Synthetic tag
2916       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2917       if (attribute_length != 0) {
2918         classfile_parse_error(
2919           "Invalid Synthetic classfile attribute length %u in class file %s",
2920           attribute_length, CHECK);
2921       }
2922       parse_classfile_synthetic_attribute(CHECK);
2923     } else if (tag == vmSymbols::tag_deprecated()) {
2924       // Check for Deprecatd tag - 4276120
2925       if (attribute_length != 0) {
2926         classfile_parse_error(
2927           "Invalid Deprecated classfile attribute length %u in class file %s",
2928           attribute_length, CHECK);
2929       }
2930     } else if (_major_version >= JAVA_1_5_VERSION) {
2931       if (tag == vmSymbols::tag_signature()) {
2932         if (attribute_length != 2) {
2933           classfile_parse_error(
2934             "Wrong Signature attribute length %u in class file %s",
2935             attribute_length, CHECK);
2936         }
2937         parse_classfile_signature_attribute(CHECK);
2938       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2939         if (runtime_visible_annotations != NULL) {
2940           classfile_parse_error(
2941             "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2942         }
2943         runtime_visible_annotations_length = attribute_length;
2944         runtime_visible_annotations = cfs->get_u1_buffer();
2945         assert(runtime_visible_annotations != NULL, "null visible annotations");
2946         parse_annotations(runtime_visible_annotations,
2947                           runtime_visible_annotations_length,
2948                           parsed_annotations,
2949                           CHECK);
2950         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2951       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2952         if (runtime_invisible_annotations_exists) {
2953           classfile_parse_error(
2954             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2955         }
2956         runtime_invisible_annotations_exists = true;
2957         if (PreserveAllAnnotations) {
2958           runtime_invisible_annotations_length = attribute_length;
2959           runtime_invisible_annotations = cfs->get_u1_buffer();
2960           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2961         }
2962         cfs->skip_u1(attribute_length, CHECK);
2963       } else if (tag == vmSymbols::tag_enclosing_method()) {
2964         if (parsed_enclosingmethod_attribute) {
2965           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2966         } else {
2967           parsed_enclosingmethod_attribute = true;
2968         }
2969         guarantee_property(attribute_length == 4,
2970           "Wrong EnclosingMethod attribute length %u in class file %s",
2971           attribute_length, CHECK);
2972         cfs->guarantee_more(4, CHECK);  // class_index, method_index
2973         enclosing_method_class_index  = cfs->get_u2_fast();
2974         enclosing_method_method_index = cfs->get_u2_fast();
2975         if (enclosing_method_class_index == 0) {
2976           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2977         }
2978         // Validate the constant pool indices and types
2979         check_property(valid_klass_reference_at(enclosing_method_class_index),
2980           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2981         if (enclosing_method_method_index != 0 &&
2982             (!_cp->is_within_bounds(enclosing_method_method_index) ||
2983              !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2984           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2985         }
2986       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2987                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2988         if (parsed_bootstrap_methods_attribute)
2989           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2990         parsed_bootstrap_methods_attribute = true;
2991         parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2992       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2993         if (runtime_visible_type_annotations != NULL) {
2994           classfile_parse_error(
2995             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
2996         }
2997         runtime_visible_type_annotations_length = attribute_length;
2998         runtime_visible_type_annotations = cfs->get_u1_buffer();
2999         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3000         // No need for the VM to parse Type annotations
3001         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3002       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3003         if (runtime_invisible_type_annotations_exists) {
3004           classfile_parse_error(
3005             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3006         } else {
3007           runtime_invisible_type_annotations_exists = true;
3008         }
3009         if (PreserveAllAnnotations) {
3010           runtime_invisible_type_annotations_length = attribute_length;
3011           runtime_invisible_type_annotations = cfs->get_u1_buffer();
3012           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3013         }
3014         cfs->skip_u1(attribute_length, CHECK);
3015       } else {
3016         // Unknown attribute
3017         cfs->skip_u1(attribute_length, CHECK);
3018       }
3019     } else {
3020       // Unknown attribute
3021       cfs->skip_u1(attribute_length, CHECK);
3022     }
3023   }
3024   _annotations = assemble_annotations(runtime_visible_annotations,
3025                                       runtime_visible_annotations_length,
3026                                       runtime_invisible_annotations,
3027                                       runtime_invisible_annotations_length,
3028                                       CHECK);
3029   _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3030                                            runtime_visible_type_annotations_length,
3031                                            runtime_invisible_type_annotations,
3032                                            runtime_invisible_type_annotations_length,
3033                                            CHECK);
3034 
3035   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3036     u2 num_of_classes = parse_classfile_inner_classes_attribute(
3037                             inner_classes_attribute_start,
3038                             parsed_innerclasses_attribute,
3039                             enclosing_method_class_index,
3040                             enclosing_method_method_index,
3041                             CHECK);
3042     if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3043       guarantee_property(
3044         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3045         "Wrong InnerClasses attribute length in class file %s", CHECK);
3046     }
3047   }
3048 
3049   if (_max_bootstrap_specifier_index >= 0) {
3050     guarantee_property(parsed_bootstrap_methods_attribute,
3051                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3052   }
3053 }
3054 
3055 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3056   if (_synthetic_flag)
3057     k->set_is_synthetic();
3058   if (_sourcefile_index != 0) {
3059     k->set_source_file_name_index(_sourcefile_index);
3060   }
3061   if (_generic_signature_index != 0) {
3062     k->set_generic_signature_index(_generic_signature_index);
3063   }
3064   if (_sde_buffer != NULL) {
3065     k->set_source_debug_extension(_sde_buffer, _sde_length);
3066   }
3067 }
3068 
3069 // Create the Annotations object that will
3070 // hold the annotations array for the Klass.
3071 void ClassFileParser::create_combined_annotations(TRAPS) {
3072     if (_annotations == NULL &&
3073         _type_annotations == NULL &&
3074         _fields_annotations == NULL &&
3075         _fields_type_annotations == NULL) {
3076       // Don't create the Annotations object unnecessarily.
3077       return;
3078     }
3079 
3080     Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3081     annotations->set_class_annotations(_annotations);
3082     annotations->set_class_type_annotations(_type_annotations);
3083     annotations->set_fields_annotations(_fields_annotations);
3084     annotations->set_fields_type_annotations(_fields_type_annotations);
3085 
3086     // This is the Annotations object that will be
3087     // assigned to InstanceKlass being constructed.
3088     _combined_annotations = annotations;
3089 
3090     // The annotations arrays below has been transfered the
3091     // _combined_annotations so these fields can now be cleared.
3092     _annotations             = NULL;
3093     _type_annotations        = NULL;
3094     _fields_annotations      = NULL;
3095     _fields_type_annotations = NULL;
3096 }
3097 
3098 // Transfer ownership of metadata allocated to the InstanceKlass.
3099 void ClassFileParser::apply_parsed_class_metadata(
3100                                             instanceKlassHandle this_klass,
3101                                             int java_fields_count, TRAPS) {
3102   _cp->set_pool_holder(this_klass());
3103   this_klass->set_constants(_cp);
3104   this_klass->set_fields(_fields, java_fields_count);
3105   this_klass->set_methods(_methods);
3106   this_klass->set_inner_classes(_inner_classes);
3107   this_klass->set_local_interfaces(_local_interfaces);
3108   this_klass->set_transitive_interfaces(_transitive_interfaces);
3109   this_klass->set_annotations(_combined_annotations);
3110 
3111   // Clear out these fields so they don't get deallocated by the destructor
3112   clear_class_metadata();
3113 }
3114 
3115 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3116                                                        int runtime_visible_annotations_length,
3117                                                        u1* runtime_invisible_annotations,
3118                                                        int runtime_invisible_annotations_length, TRAPS) {
3119   AnnotationArray* annotations = NULL;
3120   if (runtime_visible_annotations != NULL ||
3121       runtime_invisible_annotations != NULL) {
3122     annotations = MetadataFactory::new_array<u1>(_loader_data,
3123                                           runtime_visible_annotations_length +
3124                                           runtime_invisible_annotations_length,
3125                                           CHECK_(annotations));
3126     if (runtime_visible_annotations != NULL) {
3127       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3128         annotations->at_put(i, runtime_visible_annotations[i]);
3129       }
3130     }
3131     if (runtime_invisible_annotations != NULL) {
3132       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3133         int append = runtime_visible_annotations_length+i;
3134         annotations->at_put(append, runtime_invisible_annotations[i]);
3135       }
3136     }
3137   }
3138   return annotations;
3139 }
3140 
3141 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3142                                                        TRAPS) {
3143   instanceKlassHandle super_klass;
3144   if (super_class_index == 0) {
3145     check_property(_class_name == vmSymbols::java_lang_Object(),
3146                    "Invalid superclass index %u in class file %s",
3147                    super_class_index,
3148                    CHECK_NULL);
3149   } else {
3150     check_property(valid_klass_reference_at(super_class_index),
3151                    "Invalid superclass index %u in class file %s",
3152                    super_class_index,
3153                    CHECK_NULL);
3154     // The class name should be legal because it is checked when parsing constant pool.
3155     // However, make sure it is not an array type.
3156     bool is_array = false;
3157     if (_cp->tag_at(super_class_index).is_klass()) {
3158       super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3159       if (_need_verify)
3160         is_array = super_klass->oop_is_array();
3161     } else if (_need_verify) {
3162       is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3163     }
3164     if (_need_verify) {
3165       guarantee_property(!is_array,
3166                         "Bad superclass name in class file %s", CHECK_NULL);
3167     }
3168   }
3169   return super_klass;
3170 }
3171 
3172 
3173 // Values needed for oopmap and InstanceKlass creation
3174 class FieldLayoutInfo : public StackObj {
3175  public:
3176   int*          nonstatic_oop_offsets;
3177   unsigned int* nonstatic_oop_counts;
3178   unsigned int  nonstatic_oop_map_count;
3179   unsigned int  total_oop_map_count;
3180   int           instance_size;
3181   int           nonstatic_field_size;
3182   int           static_field_size;
3183   bool          has_nonstatic_fields;
3184 };
3185 
3186 // Layout fields and fill in FieldLayoutInfo.  Could use more refactoring!
3187 void ClassFileParser::layout_fields(Handle class_loader,
3188                                     FieldAllocationCount* fac,
3189                                     ClassAnnotationCollector* parsed_annotations,
3190                                     FieldLayoutInfo* info,
3191                                     TRAPS) {
3192 
3193   // Field size and offset computation
3194   int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3195   int next_static_oop_offset;
3196   int next_static_double_offset;
3197   int next_static_word_offset;
3198   int next_static_short_offset;
3199   int next_static_byte_offset;
3200   int next_nonstatic_oop_offset;
3201   int next_nonstatic_double_offset;
3202   int next_nonstatic_word_offset;
3203   int next_nonstatic_short_offset;
3204   int next_nonstatic_byte_offset;
3205   int first_nonstatic_oop_offset;
3206   int next_nonstatic_field_offset;
3207   int next_nonstatic_padded_offset;
3208 
3209   // Count the contended fields by type.
3210   //
3211   // We ignore static fields, because @Contended is not supported for them.
3212   // The layout code below will also ignore the static fields.
3213   int nonstatic_contended_count = 0;
3214   FieldAllocationCount fac_contended;
3215   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3216     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3217     if (fs.is_contended()) {
3218       fac_contended.count[atype]++;
3219       if (!fs.access_flags().is_static()) {
3220         nonstatic_contended_count++;
3221       }
3222     }
3223   }
3224 
3225 
3226   // Calculate the starting byte offsets
3227   next_static_oop_offset      = InstanceMirrorKlass::offset_of_static_fields();
3228   next_static_double_offset   = next_static_oop_offset +
3229                                 ((fac->count[STATIC_OOP]) * heapOopSize);
3230   if ( fac->count[STATIC_DOUBLE] &&
3231        (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3232         Universe::field_type_should_be_aligned(T_LONG)) ) {
3233     next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3234   }
3235 
3236   next_static_word_offset     = next_static_double_offset +
3237                                 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3238   next_static_short_offset    = next_static_word_offset +
3239                                 ((fac->count[STATIC_WORD]) * BytesPerInt);
3240   next_static_byte_offset     = next_static_short_offset +
3241                                 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3242 
3243   int nonstatic_fields_start  = instanceOopDesc::base_offset_in_bytes() +
3244                                 nonstatic_field_size * heapOopSize;
3245 
3246   next_nonstatic_field_offset = nonstatic_fields_start;
3247 
3248   bool is_contended_class     = parsed_annotations->is_contended();
3249 
3250   // Class is contended, pad before all the fields
3251   if (is_contended_class) {
3252     next_nonstatic_field_offset += ContendedPaddingWidth;
3253   }
3254 
3255   // Compute the non-contended fields count.
3256   // The packing code below relies on these counts to determine if some field
3257   // can be squeezed into the alignment gap. Contended fields are obviously
3258   // exempt from that.
3259   unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3260   unsigned int nonstatic_word_count   = fac->count[NONSTATIC_WORD]   - fac_contended.count[NONSTATIC_WORD];
3261   unsigned int nonstatic_short_count  = fac->count[NONSTATIC_SHORT]  - fac_contended.count[NONSTATIC_SHORT];
3262   unsigned int nonstatic_byte_count   = fac->count[NONSTATIC_BYTE]   - fac_contended.count[NONSTATIC_BYTE];
3263   unsigned int nonstatic_oop_count    = fac->count[NONSTATIC_OOP]    - fac_contended.count[NONSTATIC_OOP];
3264 
3265   // Total non-static fields count, including every contended field
3266   unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3267                                         fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3268                                         fac->count[NONSTATIC_OOP];
3269 
3270   bool super_has_nonstatic_fields =
3271           (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3272   bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3273 
3274 
3275   // Prepare list of oops for oop map generation.
3276   //
3277   // "offset" and "count" lists are describing the set of contiguous oop
3278   // regions. offset[i] is the start of the i-th region, which then has
3279   // count[i] oops following. Before we know how many regions are required,
3280   // we pessimistically allocate the maps to fit all the oops into the
3281   // distinct regions.
3282   //
3283   // TODO: We add +1 to always allocate non-zero resource arrays; we need
3284   // to figure out if we still need to do this.
3285   int* nonstatic_oop_offsets;
3286   unsigned int* nonstatic_oop_counts;
3287   unsigned int nonstatic_oop_map_count = 0;
3288   unsigned int max_nonstatic_oop_maps  = fac->count[NONSTATIC_OOP] + 1;
3289 
3290   nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3291             THREAD, int, max_nonstatic_oop_maps);
3292   nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
3293             THREAD, unsigned int, max_nonstatic_oop_maps);
3294 
3295   first_nonstatic_oop_offset = 0; // will be set for first oop field
3296 
3297   bool compact_fields   = CompactFields;
3298   int  allocation_style = FieldsAllocationStyle;
3299   if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3300     assert(false, "0 <= FieldsAllocationStyle <= 2");
3301     allocation_style = 1; // Optimistic
3302   }
3303 
3304   // The next classes have predefined hard-coded fields offsets
3305   // (see in JavaClasses::compute_hard_coded_offsets()).
3306   // Use default fields allocation order for them.
3307   if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3308       (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3309        _class_name == vmSymbols::java_lang_Class() ||
3310        _class_name == vmSymbols::java_lang_ClassLoader() ||
3311        _class_name == vmSymbols::java_lang_ref_Reference() ||
3312        _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3313        _class_name == vmSymbols::java_lang_StackTraceElement() ||
3314        _class_name == vmSymbols::java_lang_String() ||
3315        _class_name == vmSymbols::java_lang_Throwable() ||
3316        _class_name == vmSymbols::java_lang_Boolean() ||
3317        _class_name == vmSymbols::java_lang_Character() ||
3318        _class_name == vmSymbols::java_lang_Float() ||
3319        _class_name == vmSymbols::java_lang_Double() ||
3320        _class_name == vmSymbols::java_lang_Byte() ||
3321        _class_name == vmSymbols::java_lang_Short() ||
3322        _class_name == vmSymbols::java_lang_Integer() ||
3323        _class_name == vmSymbols::java_lang_Long())) {
3324     allocation_style = 0;     // Allocate oops first
3325     compact_fields   = false; // Don't compact fields
3326   }
3327 
3328   // Rearrange fields for a given allocation style
3329   if( allocation_style == 0 ) {
3330     // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3331     next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3332     next_nonstatic_double_offset = next_nonstatic_oop_offset +
3333                                     (nonstatic_oop_count * heapOopSize);
3334   } else if( allocation_style == 1 ) {
3335     // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3336     next_nonstatic_double_offset = next_nonstatic_field_offset;
3337   } else if( allocation_style == 2 ) {
3338     // Fields allocation: oops fields in super and sub classes are together.
3339     if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3340         _super_klass->nonstatic_oop_map_size() > 0 ) {
3341       unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3342       OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3343       OopMapBlock* last_map = first_map + map_count - 1;
3344       int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3345       if (next_offset == next_nonstatic_field_offset) {
3346         allocation_style = 0;   // allocate oops first
3347         next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3348         next_nonstatic_double_offset = next_nonstatic_oop_offset +
3349                                        (nonstatic_oop_count * heapOopSize);
3350       }
3351     }
3352     if( allocation_style == 2 ) {
3353       allocation_style = 1;     // allocate oops last
3354       next_nonstatic_double_offset = next_nonstatic_field_offset;
3355     }
3356   } else {
3357     ShouldNotReachHere();
3358   }
3359 
3360   int nonstatic_oop_space_count   = 0;
3361   int nonstatic_word_space_count  = 0;
3362   int nonstatic_short_space_count = 0;
3363   int nonstatic_byte_space_count  = 0;
3364   int nonstatic_oop_space_offset;
3365   int nonstatic_word_space_offset;
3366   int nonstatic_short_space_offset;
3367   int nonstatic_byte_space_offset;
3368 
3369   // Try to squeeze some of the fields into the gaps due to
3370   // long/double alignment.
3371   if( nonstatic_double_count > 0 ) {
3372     int offset = next_nonstatic_double_offset;
3373     next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3374     if( compact_fields && offset != next_nonstatic_double_offset ) {
3375       // Allocate available fields into the gap before double field.
3376       int length = next_nonstatic_double_offset - offset;
3377       assert(length == BytesPerInt, "");
3378       nonstatic_word_space_offset = offset;
3379       if( nonstatic_word_count > 0 ) {
3380         nonstatic_word_count      -= 1;
3381         nonstatic_word_space_count = 1; // Only one will fit
3382         length -= BytesPerInt;
3383         offset += BytesPerInt;
3384       }
3385       nonstatic_short_space_offset = offset;
3386       while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3387         nonstatic_short_count       -= 1;
3388         nonstatic_short_space_count += 1;
3389         length -= BytesPerShort;
3390         offset += BytesPerShort;
3391       }
3392       nonstatic_byte_space_offset = offset;
3393       while( length > 0 && nonstatic_byte_count > 0 ) {
3394         nonstatic_byte_count       -= 1;
3395         nonstatic_byte_space_count += 1;
3396         length -= 1;
3397       }
3398       // Allocate oop field in the gap if there are no other fields for that.
3399       nonstatic_oop_space_offset = offset;
3400       if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3401           allocation_style != 0 ) { // when oop fields not first
3402         nonstatic_oop_count      -= 1;
3403         nonstatic_oop_space_count = 1; // Only one will fit
3404         length -= heapOopSize;
3405         offset += heapOopSize;
3406       }
3407     }
3408   }
3409 
3410   next_nonstatic_word_offset  = next_nonstatic_double_offset +
3411                                 (nonstatic_double_count * BytesPerLong);
3412   next_nonstatic_short_offset = next_nonstatic_word_offset +
3413                                 (nonstatic_word_count * BytesPerInt);
3414   next_nonstatic_byte_offset  = next_nonstatic_short_offset +
3415                                 (nonstatic_short_count * BytesPerShort);
3416   next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3417                                 nonstatic_byte_count;
3418 
3419   // let oops jump before padding with this allocation style
3420   if( allocation_style == 1 ) {
3421     next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3422     if( nonstatic_oop_count > 0 ) {
3423       next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3424     }
3425     next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3426   }
3427 
3428   // Iterate over fields again and compute correct offsets.
3429   // The field allocation type was temporarily stored in the offset slot.
3430   // oop fields are located before non-oop fields (static and non-static).
3431   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3432 
3433     // skip already laid out fields
3434     if (fs.is_offset_set()) continue;
3435 
3436     // contended instance fields are handled below
3437     if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3438 
3439     int real_offset;
3440     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3441 
3442     // pack the rest of the fields
3443     switch (atype) {
3444       case STATIC_OOP:
3445         real_offset = next_static_oop_offset;
3446         next_static_oop_offset += heapOopSize;
3447         break;
3448       case STATIC_BYTE:
3449         real_offset = next_static_byte_offset;
3450         next_static_byte_offset += 1;
3451         break;
3452       case STATIC_SHORT:
3453         real_offset = next_static_short_offset;
3454         next_static_short_offset += BytesPerShort;
3455         break;
3456       case STATIC_WORD:
3457         real_offset = next_static_word_offset;
3458         next_static_word_offset += BytesPerInt;
3459         break;
3460       case STATIC_DOUBLE:
3461         real_offset = next_static_double_offset;
3462         next_static_double_offset += BytesPerLong;
3463         break;
3464       case NONSTATIC_OOP:
3465         if( nonstatic_oop_space_count > 0 ) {
3466           real_offset = nonstatic_oop_space_offset;
3467           nonstatic_oop_space_offset += heapOopSize;
3468           nonstatic_oop_space_count  -= 1;
3469         } else {
3470           real_offset = next_nonstatic_oop_offset;
3471           next_nonstatic_oop_offset += heapOopSize;
3472         }
3473 
3474         // Record this oop in the oop maps
3475         if( nonstatic_oop_map_count > 0 &&
3476             nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3477             real_offset -
3478             int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3479             heapOopSize ) {
3480           // This oop is adjacent to the previous one, add to current oop map
3481           assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3482           nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3483         } else {
3484           // This oop is not adjacent to the previous one, create new oop map
3485           assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3486           nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3487           nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3488           nonstatic_oop_map_count += 1;
3489           if( first_nonstatic_oop_offset == 0 ) { // Undefined
3490             first_nonstatic_oop_offset = real_offset;
3491           }
3492         }
3493         break;
3494       case NONSTATIC_BYTE:
3495         if( nonstatic_byte_space_count > 0 ) {
3496           real_offset = nonstatic_byte_space_offset;
3497           nonstatic_byte_space_offset += 1;
3498           nonstatic_byte_space_count  -= 1;
3499         } else {
3500           real_offset = next_nonstatic_byte_offset;
3501           next_nonstatic_byte_offset += 1;
3502         }
3503         break;
3504       case NONSTATIC_SHORT:
3505         if( nonstatic_short_space_count > 0 ) {
3506           real_offset = nonstatic_short_space_offset;
3507           nonstatic_short_space_offset += BytesPerShort;
3508           nonstatic_short_space_count  -= 1;
3509         } else {
3510           real_offset = next_nonstatic_short_offset;
3511           next_nonstatic_short_offset += BytesPerShort;
3512         }
3513         break;
3514       case NONSTATIC_WORD:
3515         if( nonstatic_word_space_count > 0 ) {
3516           real_offset = nonstatic_word_space_offset;
3517           nonstatic_word_space_offset += BytesPerInt;
3518           nonstatic_word_space_count  -= 1;
3519         } else {
3520           real_offset = next_nonstatic_word_offset;
3521           next_nonstatic_word_offset += BytesPerInt;
3522         }
3523         break;
3524       case NONSTATIC_DOUBLE:
3525         real_offset = next_nonstatic_double_offset;
3526         next_nonstatic_double_offset += BytesPerLong;
3527         break;
3528       default:
3529         ShouldNotReachHere();
3530     }
3531     fs.set_offset(real_offset);
3532   }
3533 
3534 
3535   // Handle the contended cases.
3536   //
3537   // Each contended field should not intersect the cache line with another contended field.
3538   // In the absence of alignment information, we end up with pessimistically separating
3539   // the fields with full-width padding.
3540   //
3541   // Additionally, this should not break alignment for the fields, so we round the alignment up
3542   // for each field.
3543   if (nonstatic_contended_count > 0) {
3544 
3545     // if there is at least one contended field, we need to have pre-padding for them
3546     next_nonstatic_padded_offset += ContendedPaddingWidth;
3547 
3548     // collect all contended groups
3549     BitMap bm(_cp->size());
3550     for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3551       // skip already laid out fields
3552       if (fs.is_offset_set()) continue;
3553 
3554       if (fs.is_contended()) {
3555         bm.set_bit(fs.contended_group());
3556       }
3557     }
3558 
3559     int current_group = -1;
3560     while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3561 
3562       for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3563 
3564         // skip already laid out fields
3565         if (fs.is_offset_set()) continue;
3566 
3567         // skip non-contended fields and fields from different group
3568         if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3569 
3570         // handle statics below
3571         if (fs.access_flags().is_static()) continue;
3572 
3573         int real_offset;
3574         FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3575 
3576         switch (atype) {
3577           case NONSTATIC_BYTE:
3578             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3579             real_offset = next_nonstatic_padded_offset;
3580             next_nonstatic_padded_offset += 1;
3581             break;
3582 
3583           case NONSTATIC_SHORT:
3584             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3585             real_offset = next_nonstatic_padded_offset;
3586             next_nonstatic_padded_offset += BytesPerShort;
3587             break;
3588 
3589           case NONSTATIC_WORD:
3590             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3591             real_offset = next_nonstatic_padded_offset;
3592             next_nonstatic_padded_offset += BytesPerInt;
3593             break;
3594 
3595           case NONSTATIC_DOUBLE:
3596             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3597             real_offset = next_nonstatic_padded_offset;
3598             next_nonstatic_padded_offset += BytesPerLong;
3599             break;
3600 
3601           case NONSTATIC_OOP:
3602             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3603             real_offset = next_nonstatic_padded_offset;
3604             next_nonstatic_padded_offset += heapOopSize;
3605 
3606             // Record this oop in the oop maps
3607             if( nonstatic_oop_map_count > 0 &&
3608                 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3609                 real_offset -
3610                 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3611                 heapOopSize ) {
3612               // This oop is adjacent to the previous one, add to current oop map
3613               assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3614               nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3615             } else {
3616               // This oop is not adjacent to the previous one, create new oop map
3617               assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3618               nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3619               nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3620               nonstatic_oop_map_count += 1;
3621               if( first_nonstatic_oop_offset == 0 ) { // Undefined
3622                 first_nonstatic_oop_offset = real_offset;
3623               }
3624             }
3625             break;
3626 
3627           default:
3628             ShouldNotReachHere();
3629         }
3630 
3631         if (fs.contended_group() == 0) {
3632           // Contended group defines the equivalence class over the fields:
3633           // the fields within the same contended group are not inter-padded.
3634           // The only exception is default group, which does not incur the
3635           // equivalence, and so requires intra-padding.
3636           next_nonstatic_padded_offset += ContendedPaddingWidth;
3637         }
3638 
3639         fs.set_offset(real_offset);
3640       } // for
3641 
3642       // Start laying out the next group.
3643       // Note that this will effectively pad the last group in the back;
3644       // this is expected to alleviate memory contention effects for
3645       // subclass fields and/or adjacent object.
3646       // If this was the default group, the padding is already in place.
3647       if (current_group != 0) {
3648         next_nonstatic_padded_offset += ContendedPaddingWidth;
3649       }
3650     }
3651 
3652     // handle static fields
3653   }
3654 
3655   // Entire class is contended, pad in the back.
3656   // This helps to alleviate memory contention effects for subclass fields
3657   // and/or adjacent object.
3658   if (is_contended_class) {
3659     next_nonstatic_padded_offset += ContendedPaddingWidth;
3660   }
3661 
3662   int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3663 
3664   int nonstatic_fields_end      = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3665   int instance_end              = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3666   int static_fields_end         = align_size_up(next_static_byte_offset, wordSize);
3667 
3668   int static_field_size         = (static_fields_end -
3669                                    InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3670   nonstatic_field_size          = nonstatic_field_size +
3671                                   (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3672 
3673   int instance_size             = align_object_size(instance_end / wordSize);
3674 
3675   assert(instance_size == align_object_size(align_size_up(
3676          (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3677           wordSize) / wordSize), "consistent layout helper value");
3678 
3679   // Invariant: nonstatic_field end/start should only change if there are
3680   // nonstatic fields in the class, or if the class is contended. We compare
3681   // against the non-aligned value, so that end alignment will not fail the
3682   // assert without actually having the fields.
3683   assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3684          is_contended_class ||
3685          (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3686 
3687   // Number of non-static oop map blocks allocated at end of klass.
3688   const unsigned int total_oop_map_count =
3689     compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3690                           first_nonstatic_oop_offset);
3691 
3692 #ifndef PRODUCT
3693   if (PrintFieldLayout) {
3694     print_field_layout(_class_name,
3695           _fields,
3696           _cp,
3697           instance_size,
3698           nonstatic_fields_start,
3699           nonstatic_fields_end,
3700           static_fields_end);
3701   }
3702 
3703 #endif
3704   // Pass back information needed for InstanceKlass creation
3705   info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3706   info->nonstatic_oop_counts = nonstatic_oop_counts;
3707   info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3708   info->total_oop_map_count = total_oop_map_count;
3709   info->instance_size = instance_size;
3710   info->static_field_size = static_field_size;
3711   info->nonstatic_field_size = nonstatic_field_size;
3712   info->has_nonstatic_fields = has_nonstatic_fields;
3713 }
3714 
3715 
3716 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3717                                                     ClassLoaderData* loader_data,
3718                                                     Handle protection_domain,
3719                                                     KlassHandle host_klass,
3720                                                     GrowableArray<Handle>* cp_patches,
3721                                                     TempNewSymbol& parsed_name,
3722                                                     bool verify,
3723                                                     TRAPS) {
3724 
3725   // When a retransformable agent is attached, JVMTI caches the
3726   // class bytes that existed before the first retransformation.
3727   // If RedefineClasses() was used before the retransformable
3728   // agent attached, then the cached class bytes may not be the
3729   // original class bytes.
3730   JvmtiCachedClassFileData *cached_class_file = NULL;
3731   Handle class_loader(THREAD, loader_data->class_loader());
3732   bool has_default_methods = false;
3733   bool declares_default_methods = false;
3734   ResourceMark rm(THREAD);
3735 
3736   ClassFileStream* cfs = stream();
3737   // Timing
3738   assert(THREAD->is_Java_thread(), "must be a JavaThread");
3739   JavaThread* jt = (JavaThread*) THREAD;
3740 
3741   PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3742                             ClassLoader::perf_class_parse_selftime(),
3743                             NULL,
3744                             jt->get_thread_stat()->perf_recursion_counts_addr(),
3745                             jt->get_thread_stat()->perf_timers_addr(),
3746                             PerfClassTraceTime::PARSE_CLASS);
3747 
3748   init_parsed_class_attributes(loader_data);
3749 
3750   if (JvmtiExport::should_post_class_file_load_hook()) {
3751     // Get the cached class file bytes (if any) from the class that
3752     // is being redefined or retransformed. We use jvmti_thread_state()
3753     // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3754     // a JvmtiThreadState any earlier than necessary. This will help
3755     // avoid the bug described by 7126851.
3756     JvmtiThreadState *state = jt->jvmti_thread_state();
3757     if (state != NULL) {
3758       KlassHandle *h_class_being_redefined =
3759                      state->get_class_being_redefined();
3760       if (h_class_being_redefined != NULL) {
3761         instanceKlassHandle ikh_class_being_redefined =
3762           instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3763         cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3764       }
3765     }
3766 
3767     unsigned char* ptr = cfs->buffer();
3768     unsigned char* end_ptr = cfs->buffer() + cfs->length();
3769 
3770     JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3771                                            &ptr, &end_ptr, &cached_class_file);
3772 
3773     if (ptr != cfs->buffer()) {
3774       // JVMTI agent has modified class file data.
3775       // Set new class file stream using JVMTI agent modified
3776       // class file data.
3777       cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3778       set_stream(cfs);
3779     }
3780   }
3781 
3782   _host_klass = host_klass;
3783   _cp_patches = cp_patches;
3784 
3785   instanceKlassHandle nullHandle;
3786 
3787   // Figure out whether we can skip format checking (matching classic VM behavior)
3788   if (DumpSharedSpaces) {
3789     // verify == true means it's a 'remote' class (i.e., non-boot class)
3790     // Verification decision is based on BytecodeVerificationRemote flag
3791     // for those classes.
3792     _need_verify = (verify) ? BytecodeVerificationRemote :
3793                               BytecodeVerificationLocal;
3794   } else {
3795     _need_verify = Verifier::should_verify_for(class_loader(), verify);
3796   }
3797 
3798   // Set the verify flag in stream
3799   cfs->set_verify(_need_verify);
3800 
3801   // Save the class file name for easier error message printing.
3802   _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3803 
3804   cfs->guarantee_more(8, CHECK_(nullHandle));  // magic, major, minor
3805   // Magic value
3806   u4 magic = cfs->get_u4_fast();
3807   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3808                      "Incompatible magic value %u in class file %s",
3809                      magic, CHECK_(nullHandle));
3810 
3811   // Version numbers
3812   u2 minor_version = cfs->get_u2_fast();
3813   u2 major_version = cfs->get_u2_fast();
3814 
3815   if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3816     ResourceMark rm;
3817     warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3818             major_version,  minor_version, name->as_C_string());
3819     Exceptions::fthrow(
3820       THREAD_AND_LOCATION,
3821       vmSymbols::java_lang_UnsupportedClassVersionError(),
3822       "Unsupported major.minor version for dump time %u.%u",
3823       major_version,
3824       minor_version);
3825   }
3826 
3827   // Check version numbers - we check this even with verifier off
3828   if (!is_supported_version(major_version, minor_version)) {
3829     if (name == NULL) {
3830       Exceptions::fthrow(
3831         THREAD_AND_LOCATION,
3832         vmSymbols::java_lang_UnsupportedClassVersionError(),
3833         "Unsupported class file version %u.%u, "
3834         "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3835         major_version,
3836         minor_version,
3837         JAVA_MAX_SUPPORTED_VERSION,
3838         JAVA_MAX_SUPPORTED_MINOR_VERSION);
3839     } else {
3840       ResourceMark rm(THREAD);
3841       Exceptions::fthrow(
3842         THREAD_AND_LOCATION,
3843         vmSymbols::java_lang_UnsupportedClassVersionError(),
3844         "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3845         "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3846         name->as_C_string(),
3847         major_version,
3848         minor_version,
3849         JAVA_MAX_SUPPORTED_VERSION,
3850         JAVA_MAX_SUPPORTED_MINOR_VERSION);
3851     }
3852     return nullHandle;
3853   }
3854 
3855   _major_version = major_version;
3856   _minor_version = minor_version;
3857 
3858 
3859   // Check if verification needs to be relaxed for this class file
3860   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3861   _relax_verify = Verifier::relax_verify_for(class_loader());
3862 
3863   // Constant pool
3864   constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3865 
3866   int cp_size = cp->length();
3867 
3868   cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
3869 
3870   // Access flags
3871   AccessFlags access_flags;
3872   jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3873 
3874   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3875     // Set abstract bit for old class files for backward compatibility
3876     flags |= JVM_ACC_ABSTRACT;
3877   }
3878   verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3879   access_flags.set_flags(flags);
3880 
3881   // This class and superclass
3882   u2 this_class_index = cfs->get_u2_fast();
3883   check_property(
3884     valid_cp_range(this_class_index, cp_size) &&
3885       cp->tag_at(this_class_index).is_unresolved_klass(),
3886     "Invalid this class index %u in constant pool in class file %s",
3887     this_class_index, CHECK_(nullHandle));
3888 
3889   Symbol*  class_name  = cp->klass_name_at(this_class_index);
3890   assert(class_name != NULL, "class_name can't be null");
3891 
3892   // It's important to set parsed_name *before* resolving the super class.
3893   // (it's used for cleanup by the caller if parsing fails)
3894   parsed_name = class_name;
3895   // parsed_name is returned and can be used if there's an error, so add to
3896   // its reference count.  Caller will decrement the refcount.
3897   parsed_name->increment_refcount();
3898 
3899   // Update _class_name which could be null previously to be class_name
3900   _class_name = class_name;
3901 
3902   // Don't need to check whether this class name is legal or not.
3903   // It has been checked when constant pool is parsed.
3904   // However, make sure it is not an array type.
3905   if (_need_verify) {
3906     guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3907                        "Bad class name in class file %s",
3908                        CHECK_(nullHandle));
3909   }
3910 
3911   Klass* preserve_this_klass;   // for storing result across HandleMark
3912 
3913   // release all handles when parsing is done
3914   { HandleMark hm(THREAD);
3915 
3916     // Checks if name in class file matches requested name
3917     if (name != NULL && class_name != name) {
3918       ResourceMark rm(THREAD);
3919       Exceptions::fthrow(
3920         THREAD_AND_LOCATION,
3921         vmSymbols::java_lang_NoClassDefFoundError(),
3922         "%s (wrong name: %s)",
3923         name->as_C_string(),
3924         class_name->as_C_string()
3925       );
3926       return nullHandle;
3927     }
3928 
3929     if (TraceClassLoadingPreorder) {
3930       tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3931       if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3932       tty->print_cr("]");
3933     }
3934 #if INCLUDE_CDS
3935     if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3936       // Only dump the classes that can be stored into CDS archive
3937       if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3938         if (name != NULL) {
3939           ResourceMark rm(THREAD);
3940           classlist_file->print_cr("%s", name->as_C_string());
3941           classlist_file->flush();
3942         }
3943       }
3944     }
3945 #endif
3946 
3947     u2 super_class_index = cfs->get_u2_fast();
3948     instanceKlassHandle super_klass = parse_super_class(super_class_index,
3949                                                         CHECK_NULL);
3950 
3951     // Interfaces
3952     u2 itfs_len = cfs->get_u2_fast();
3953     Array<Klass*>* local_interfaces =
3954       parse_interfaces(itfs_len, protection_domain, _class_name,
3955                        &has_default_methods, CHECK_(nullHandle));
3956 
3957     u2 java_fields_count = 0;
3958     // Fields (offsets are filled in later)
3959     FieldAllocationCount fac;
3960     Array<u2>* fields = parse_fields(class_name,
3961                                      access_flags.is_interface(),
3962                                      &fac, &java_fields_count,
3963                                      CHECK_(nullHandle));
3964     // Methods
3965     bool has_final_method = false;
3966     AccessFlags promoted_flags;
3967     promoted_flags.set_flags(0);
3968     Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3969                                             &promoted_flags,
3970                                             &has_final_method,
3971                                             &declares_default_methods,
3972                                             CHECK_(nullHandle));
3973 
3974     if (declares_default_methods) {
3975       has_default_methods = true;
3976     }
3977 
3978     // Additional attributes
3979     ClassAnnotationCollector parsed_annotations;
3980     parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3981 
3982     // Finalize the Annotations metadata object,
3983     // now that all annotation arrays have been created.
3984     create_combined_annotations(CHECK_(nullHandle));
3985 
3986     // Make sure this is the end of class file stream
3987     guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3988 
3989     // We check super class after class file is parsed and format is checked
3990     if (super_class_index > 0 && super_klass.is_null()) {
3991       Symbol*  sk  = cp->klass_name_at(super_class_index);
3992       if (access_flags.is_interface()) {
3993         // Before attempting to resolve the superclass, check for class format
3994         // errors not checked yet.
3995         guarantee_property(sk == vmSymbols::java_lang_Object(),
3996                            "Interfaces must have java.lang.Object as superclass in class file %s",
3997                            CHECK_(nullHandle));
3998       }
3999       Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4000                                                          class_loader,
4001                                                          protection_domain,
4002                                                          true,
4003                                                          CHECK_(nullHandle));
4004 
4005       KlassHandle kh (THREAD, k);
4006       super_klass = instanceKlassHandle(THREAD, kh());
4007     }
4008     if (super_klass.not_null()) {
4009 
4010       if (super_klass->has_default_methods()) {
4011         has_default_methods = true;
4012       }
4013 
4014       if (super_klass->is_interface()) {
4015         ResourceMark rm(THREAD);
4016         Exceptions::fthrow(
4017           THREAD_AND_LOCATION,
4018           vmSymbols::java_lang_IncompatibleClassChangeError(),
4019           "class %s has interface %s as super class",
4020           class_name->as_klass_external_name(),
4021           super_klass->external_name()
4022         );
4023         return nullHandle;
4024       }
4025       // Make sure super class is not final
4026       if (super_klass->is_final()) {
4027         THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4028       }
4029     }
4030 
4031     // save super klass for error handling.
4032     _super_klass = super_klass;
4033 
4034     // Compute the transitive list of all unique interfaces implemented by this class
4035     _transitive_interfaces =
4036           compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4037 
4038     // sort methods
4039     intArray* method_ordering = sort_methods(methods);
4040 
4041     // promote flags from parse_methods() to the klass' flags
4042     access_flags.add_promoted_flags(promoted_flags.as_int());
4043 
4044     // Size of Java vtable (in words)
4045     int vtable_size = 0;
4046     int itable_size = 0;
4047     int num_miranda_methods = 0;
4048 
4049     GrowableArray<Method*> all_mirandas(20);
4050 
4051     klassVtable::compute_vtable_size_and_num_mirandas(
4052         &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4053         access_flags, class_loader, class_name, local_interfaces,
4054                                                       CHECK_(nullHandle));
4055 
4056     // Size of Java itable (in words)
4057     itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4058 
4059     FieldLayoutInfo info;
4060     layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4061 
4062     int total_oop_map_size2 =
4063           InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4064 
4065     // Compute reference type
4066     ReferenceType rt;
4067     if (super_klass() == NULL) {
4068       rt = REF_NONE;
4069     } else {
4070       rt = super_klass->reference_type();
4071     }
4072 
4073     // We can now create the basic Klass* for this klass
4074     _klass = InstanceKlass::allocate_instance_klass(loader_data,
4075                                                     vtable_size,
4076                                                     itable_size,
4077                                                     info.static_field_size,
4078                                                     total_oop_map_size2,
4079                                                     rt,
4080                                                     access_flags,
4081                                                     name,
4082                                                     super_klass(),
4083                                                     !host_klass.is_null(),
4084                                                     CHECK_(nullHandle));
4085     instanceKlassHandle this_klass (THREAD, _klass);
4086 
4087     assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4088     assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4089            "sanity");
4090 
4091     // Fill in information already parsed
4092     this_klass->set_should_verify_class(verify);
4093     jint lh = Klass::instance_layout_helper(info.instance_size, false);
4094     this_klass->set_layout_helper(lh);
4095     assert(this_klass->oop_is_instance(), "layout is correct");
4096     assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4097     // Not yet: supers are done below to support the new subtype-checking fields
4098     //this_klass->set_super(super_klass());
4099     this_klass->set_class_loader_data(loader_data);
4100     this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4101     this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4102     this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4103 
4104     apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4105 
4106     if (has_final_method) {
4107       this_klass->set_has_final_method();
4108     }
4109     this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4110     // The InstanceKlass::_methods_jmethod_ids cache
4111     // is managed on the assumption that the initial cache
4112     // size is equal to the number of methods in the class. If
4113     // that changes, then InstanceKlass::idnum_can_increment()
4114     // has to be changed accordingly.
4115     this_klass->set_initial_method_idnum(methods->length());
4116     this_klass->set_name(cp->klass_name_at(this_class_index));
4117     if (is_anonymous())  // I am well known to myself
4118       cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4119 
4120     this_klass->set_minor_version(minor_version);
4121     this_klass->set_major_version(major_version);
4122     this_klass->set_has_default_methods(has_default_methods);
4123     this_klass->set_declares_default_methods(declares_default_methods);
4124 
4125     if (!host_klass.is_null()) {
4126       assert (this_klass->is_anonymous(), "should be the same");
4127       this_klass->set_host_klass(host_klass());
4128     }
4129 
4130     // Set up Method*::intrinsic_id as soon as we know the names of methods.
4131     // (We used to do this lazily, but now we query it in Rewriter,
4132     // which is eagerly done for every method, so we might as well do it now,
4133     // when everything is fresh in memory.)
4134     if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
4135       for (int j = 0; j < methods->length(); j++) {
4136         methods->at(j)->init_intrinsic_id();
4137       }
4138     }
4139 
4140     if (cached_class_file != NULL) {
4141       // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4142       this_klass->set_cached_class_file(cached_class_file);
4143     }
4144 
4145     // Fill in field values obtained by parse_classfile_attributes
4146     if (parsed_annotations.has_any_annotations())
4147       parsed_annotations.apply_to(this_klass);
4148     apply_parsed_class_attributes(this_klass);
4149 
4150     // Miranda methods
4151     if ((num_miranda_methods > 0) ||
4152         // if this class introduced new miranda methods or
4153         (super_klass.not_null() && (super_klass->has_miranda_methods()))
4154         // super class exists and this class inherited miranda methods
4155         ) {
4156       this_klass->set_has_miranda_methods(); // then set a flag
4157     }
4158 
4159     // Fill in information needed to compute superclasses.
4160     this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4161 
4162     // Initialize itable offset tables
4163     klassItable::setup_itable_offset_table(this_klass);
4164 
4165     // Compute transitive closure of interfaces this class implements
4166     // Do final class setup
4167     fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4168 
4169     // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4170     set_precomputed_flags(this_klass);
4171 
4172     // reinitialize modifiers, using the InnerClasses attribute
4173     int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4174     this_klass->set_modifier_flags(computed_modifiers);
4175 
4176     // check if this class can access its super class
4177     check_super_class_access(this_klass, CHECK_(nullHandle));
4178 
4179     // check if this class can access its superinterfaces
4180     check_super_interface_access(this_klass, CHECK_(nullHandle));
4181 
4182     // check if this class overrides any final method
4183     check_final_method_override(this_klass, CHECK_(nullHandle));
4184 
4185     // check that if this class is an interface then it doesn't have static methods
4186     if (this_klass->is_interface()) {
4187       /* An interface in a JAVA 8 classfile can be static */
4188       if (_major_version < JAVA_8_VERSION) {
4189         check_illegal_static_method(this_klass, CHECK_(nullHandle));
4190       }
4191     }
4192 
4193     // Allocate mirror and initialize static fields
4194     java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4195                                    CHECK_(nullHandle));
4196 
4197     // Generate any default methods - default methods are interface methods
4198     // that have a default implementation.  This is new with Lambda project.
4199     if (has_default_methods ) {
4200       DefaultMethods::generate_default_methods(
4201           this_klass(), &all_mirandas, CHECK_(nullHandle));
4202     }
4203 
4204     // Update the loader_data graph.
4205     record_defined_class_dependencies(this_klass, CHECK_NULL);
4206 
4207     ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4208                                              false /* not shared class */);
4209 
4210     if (TraceClassLoading) {
4211       ResourceMark rm;
4212       // print in a single call to reduce interleaving of output
4213       if (cfs->source() != NULL) {
4214         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4215                    cfs->source());
4216       } else if (class_loader.is_null()) {
4217         Klass* caller =
4218             THREAD->is_Java_thread()
4219                 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4220                 : NULL;
4221         // caller can be NULL, for example, during a JVMTI VM_Init hook
4222         if (caller != NULL) {
4223           tty->print("[Loaded %s by instance of %s]\n",
4224                      this_klass->external_name(),
4225                      InstanceKlass::cast(caller)->external_name());
4226         } else {
4227           tty->print("[Loaded %s]\n", this_klass->external_name());
4228         }
4229       } else {
4230         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4231                    InstanceKlass::cast(class_loader->klass())->external_name());
4232       }
4233     }
4234 
4235     if (TraceClassResolution) {
4236       ResourceMark rm;
4237       // print out the superclass.
4238       const char * from = this_klass()->external_name();
4239       if (this_klass->java_super() != NULL) {
4240         tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4241       }
4242       // print out each of the interface classes referred to by this class.
4243       Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4244       if (local_interfaces != NULL) {
4245         int length = local_interfaces->length();
4246         for (int i = 0; i < length; i++) {
4247           Klass* k = local_interfaces->at(i);
4248           InstanceKlass* to_class = InstanceKlass::cast(k);
4249           const char * to = to_class->external_name();
4250           tty->print("RESOLVE %s %s (interface)\n", from, to);
4251         }
4252       }
4253     }
4254 
4255     // preserve result across HandleMark
4256     preserve_this_klass = this_klass();
4257   }
4258 
4259   // Create new handle outside HandleMark (might be needed for
4260   // Extended Class Redefinition)
4261   instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4262   debug_only(this_klass->verify();)
4263 
4264   // Clear class if no error has occurred so destructor doesn't deallocate it
4265   _klass = NULL;
4266   return this_klass;
4267 }
4268 
4269 // Destructor to clean up if there's an error
4270 ClassFileParser::~ClassFileParser() {
4271   MetadataFactory::free_metadata(_loader_data, _cp);
4272   MetadataFactory::free_array<u2>(_loader_data, _fields);
4273 
4274   // Free methods
4275   InstanceKlass::deallocate_methods(_loader_data, _methods);
4276 
4277   // beware of the Universe::empty_blah_array!!
4278   if (_inner_classes != Universe::the_empty_short_array()) {
4279     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4280   }
4281 
4282   // Free interfaces
4283   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4284                                        _local_interfaces, _transitive_interfaces);
4285 
4286   if (_combined_annotations != NULL) {
4287     // After all annotations arrays have been created, they are installed into the
4288     // Annotations object that will be assigned to the InstanceKlass being created.
4289 
4290     // Deallocate the Annotations object and the installed annotations arrays.
4291     _combined_annotations->deallocate_contents(_loader_data);
4292 
4293     // If the _combined_annotations pointer is non-NULL,
4294     // then the other annotations fields should have been cleared.
4295     assert(_annotations             == NULL, "Should have been cleared");
4296     assert(_type_annotations        == NULL, "Should have been cleared");
4297     assert(_fields_annotations      == NULL, "Should have been cleared");
4298     assert(_fields_type_annotations == NULL, "Should have been cleared");
4299   } else {
4300     // If the annotations arrays were not installed into the Annotations object,
4301     // then they have to be deallocated explicitly.
4302     MetadataFactory::free_array<u1>(_loader_data, _annotations);
4303     MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4304     Annotations::free_contents(_loader_data, _fields_annotations);
4305     Annotations::free_contents(_loader_data, _fields_type_annotations);
4306   }
4307 
4308   clear_class_metadata();
4309 
4310   // deallocate the klass if already created.  Don't directly deallocate, but add
4311   // to the deallocate list so that the klass is removed from the CLD::_klasses list
4312   // at a safepoint.
4313   if (_klass != NULL) {
4314     _loader_data->add_to_deallocate_list(_klass);
4315   }
4316   _klass = NULL;
4317 }
4318 
4319 void ClassFileParser::print_field_layout(Symbol* name,
4320                                          Array<u2>* fields,
4321                                          constantPoolHandle cp,
4322                                          int instance_size,
4323                                          int instance_fields_start,
4324                                          int instance_fields_end,
4325                                          int static_fields_end) {
4326   tty->print("%s: field layout\n", name->as_klass_external_name());
4327   tty->print("  @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4328   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4329     if (!fs.access_flags().is_static()) {
4330       tty->print("  @%3d \"%s\" %s\n",
4331           fs.offset(),
4332           fs.name()->as_klass_external_name(),
4333           fs.signature()->as_klass_external_name());
4334     }
4335   }
4336   tty->print("  @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4337   tty->print("  @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4338   tty->print("  @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4339   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4340     if (fs.access_flags().is_static()) {
4341       tty->print("  @%3d \"%s\" %s\n",
4342           fs.offset(),
4343           fs.name()->as_klass_external_name(),
4344           fs.signature()->as_klass_external_name());
4345     }
4346   }
4347   tty->print("  @%3d %s\n", static_fields_end, "--- static fields end ---");
4348   tty->print("\n");
4349 }
4350 
4351 unsigned int
4352 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4353                                        unsigned int nonstatic_oop_map_count,
4354                                        int first_nonstatic_oop_offset) {
4355   unsigned int map_count =
4356     super.is_null() ? 0 : super->nonstatic_oop_map_count();
4357   if (nonstatic_oop_map_count > 0) {
4358     // We have oops to add to map
4359     if (map_count == 0) {
4360       map_count = nonstatic_oop_map_count;
4361     } else {
4362       // Check whether we should add a new map block or whether the last one can
4363       // be extended
4364       OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4365       OopMapBlock* const last_map = first_map + map_count - 1;
4366 
4367       int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4368       if (next_offset == first_nonstatic_oop_offset) {
4369         // There is no gap bettwen superklass's last oop field and first
4370         // local oop field, merge maps.
4371         nonstatic_oop_map_count -= 1;
4372       } else {
4373         // Superklass didn't end with a oop field, add extra maps
4374         assert(next_offset < first_nonstatic_oop_offset, "just checking");
4375       }
4376       map_count += nonstatic_oop_map_count;
4377     }
4378   }
4379   return map_count;
4380 }
4381 
4382 
4383 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4384                                     unsigned int nonstatic_oop_map_count,
4385                                     int* nonstatic_oop_offsets,
4386                                     unsigned int* nonstatic_oop_counts) {
4387   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4388   const InstanceKlass* const super = k->superklass();
4389   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4390   if (super_count > 0) {
4391     // Copy maps from superklass
4392     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4393     for (unsigned int i = 0; i < super_count; ++i) {
4394       *this_oop_map++ = *super_oop_map++;
4395     }
4396   }
4397 
4398   if (nonstatic_oop_map_count > 0) {
4399     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4400       // The counts differ because there is no gap between superklass's last oop
4401       // field and the first local oop field.  Extend the last oop map copied
4402       // from the superklass instead of creating new one.
4403       nonstatic_oop_map_count--;
4404       nonstatic_oop_offsets++;
4405       this_oop_map--;
4406       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4407       this_oop_map++;
4408     }
4409 
4410     // Add new map blocks, fill them
4411     while (nonstatic_oop_map_count-- > 0) {
4412       this_oop_map->set_offset(*nonstatic_oop_offsets++);
4413       this_oop_map->set_count(*nonstatic_oop_counts++);
4414       this_oop_map++;
4415     }
4416     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4417            this_oop_map, "sanity");
4418   }
4419 }
4420 
4421 
4422 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4423   Klass* super = k->super();
4424 
4425   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4426   // in which case we don't have to register objects as finalizable
4427   if (!_has_empty_finalizer) {
4428     if (_has_finalizer ||
4429         (super != NULL && super->has_finalizer())) {
4430       k->set_has_finalizer();
4431     }
4432   }
4433 
4434 #ifdef ASSERT
4435   bool f = false;
4436   Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4437                                  vmSymbols::void_method_signature());
4438   if (m != NULL && !m->is_empty_method()) {
4439       f = true;
4440   }
4441 
4442   // Spec doesn't prevent agent from redefinition of empty finalizer.
4443   // Despite the fact that it's generally bad idea and redefined finalizer
4444   // will not work as expected we shouldn't abort vm in this case
4445   if (!k->has_redefined_this_or_super()) {
4446     assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4447   }
4448 #endif
4449 
4450   // Check if this klass supports the java.lang.Cloneable interface
4451   if (SystemDictionary::Cloneable_klass_loaded()) {
4452     if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4453       k->set_is_cloneable();
4454     }
4455   }
4456 
4457   // Check if this klass has a vanilla default constructor
4458   if (super == NULL) {
4459     // java.lang.Object has empty default constructor
4460     k->set_has_vanilla_constructor();
4461   } else {
4462     if (super->has_vanilla_constructor() &&
4463         _has_vanilla_constructor) {
4464       k->set_has_vanilla_constructor();
4465     }
4466 #ifdef ASSERT
4467     bool v = false;
4468     if (super->has_vanilla_constructor()) {
4469       Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4470 ), vmSymbols::void_method_signature());
4471       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4472         v = true;
4473       }
4474     }
4475     assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4476 #endif
4477   }
4478 
4479   // If it cannot be fast-path allocated, set a bit in the layout helper.
4480   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4481   assert(k->size_helper() > 0, "layout_helper is initialized");
4482   if ((!RegisterFinalizersAtInit && k->has_finalizer())
4483       || k->is_abstract() || k->is_interface()
4484       || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4485       || k->size_helper() >= FastAllocateSizeLimit) {
4486     // Forbid fast-path allocation.
4487     jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4488     k->set_layout_helper(lh);
4489   }
4490 }
4491 
4492 // Attach super classes and interface classes to class loader data
4493 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4494   ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4495   if (defining_loader_data->is_the_null_class_loader_data()) {
4496       // Dependencies to null class loader data are implicit.
4497       return;
4498   } else {
4499     // add super class dependency
4500     Klass* super = defined_klass->super();
4501     if (super != NULL) {
4502       defining_loader_data->record_dependency(super, CHECK);
4503     }
4504 
4505     // add super interface dependencies
4506     Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4507     if (local_interfaces != NULL) {
4508       int length = local_interfaces->length();
4509       for (int i = 0; i < length; i++) {
4510         defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4511       }
4512     }
4513   }
4514 }
4515 
4516 // utility methods for appending an array with check for duplicates
4517 
4518 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4519   // iterate over new interfaces
4520   for (int i = 0; i < ifs->length(); i++) {
4521     Klass* e = ifs->at(i);
4522     assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4523     // add new interface
4524     result->append_if_missing(e);
4525   }
4526 }
4527 
4528 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4529                                         instanceKlassHandle super,
4530                                         Array<Klass*>* local_ifs, TRAPS) {
4531   // Compute maximum size for transitive interfaces
4532   int max_transitive_size = 0;
4533   int super_size = 0;
4534   // Add superclass transitive interfaces size
4535   if (super.not_null()) {
4536     super_size = super->transitive_interfaces()->length();
4537     max_transitive_size += super_size;
4538   }
4539   // Add local interfaces' super interfaces
4540   int local_size = local_ifs->length();
4541   for (int i = 0; i < local_size; i++) {
4542     Klass* l = local_ifs->at(i);
4543     max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4544   }
4545   // Finally add local interfaces
4546   max_transitive_size += local_size;
4547   // Construct array
4548   if (max_transitive_size == 0) {
4549     // no interfaces, use canonicalized array
4550     return Universe::the_empty_klass_array();
4551   } else if (max_transitive_size == super_size) {
4552     // no new local interfaces added, share superklass' transitive interface array
4553     return super->transitive_interfaces();
4554   } else if (max_transitive_size == local_size) {
4555     // only local interfaces added, share local interface array
4556     return local_ifs;
4557   } else {
4558     ResourceMark rm;
4559     GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4560 
4561     // Copy down from superclass
4562     if (super.not_null()) {
4563       append_interfaces(result, super->transitive_interfaces());
4564     }
4565 
4566     // Copy down from local interfaces' superinterfaces
4567     for (int i = 0; i < local_ifs->length(); i++) {
4568       Klass* l = local_ifs->at(i);
4569       append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4570     }
4571     // Finally add local interfaces
4572     append_interfaces(result, local_ifs);
4573 
4574     // length will be less than the max_transitive_size if duplicates were removed
4575     int length = result->length();
4576     assert(length <= max_transitive_size, "just checking");
4577     Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4578     for (int i = 0; i < length; i++) {
4579       Klass* e = result->at(i);
4580         assert(e != NULL, "just checking");
4581       new_result->at_put(i, e);
4582     }
4583     return new_result;
4584   }
4585 }
4586 
4587 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4588   Klass* super = this_klass->super();
4589   if ((super != NULL) &&
4590       (!Reflection::verify_class_access(this_klass(), super, false))) {
4591     ResourceMark rm(THREAD);
4592     Exceptions::fthrow(
4593       THREAD_AND_LOCATION,
4594       vmSymbols::java_lang_IllegalAccessError(),
4595       "class %s cannot access its superclass %s",
4596       this_klass->external_name(),
4597       InstanceKlass::cast(super)->external_name()
4598     );
4599     return;
4600   }
4601 }
4602 
4603 
4604 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4605   Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4606   int lng = local_interfaces->length();
4607   for (int i = lng - 1; i >= 0; i--) {
4608     Klass* k = local_interfaces->at(i);
4609     assert (k != NULL && k->is_interface(), "invalid interface");
4610     if (!Reflection::verify_class_access(this_klass(), k, false)) {
4611       ResourceMark rm(THREAD);
4612       Exceptions::fthrow(
4613         THREAD_AND_LOCATION,
4614         vmSymbols::java_lang_IllegalAccessError(),
4615         "class %s cannot access its superinterface %s",
4616         this_klass->external_name(),
4617         InstanceKlass::cast(k)->external_name()
4618       );
4619       return;
4620     }
4621   }
4622 }
4623 
4624 
4625 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4626   Array<Method*>* methods = this_klass->methods();
4627   int num_methods = methods->length();
4628 
4629   // go thru each method and check if it overrides a final method
4630   for (int index = 0; index < num_methods; index++) {
4631     Method* m = methods->at(index);
4632 
4633     // skip private, static, and <init> methods
4634     if ((!m->is_private() && !m->is_static()) &&
4635         (m->name() != vmSymbols::object_initializer_name())) {
4636 
4637       Symbol* name = m->name();
4638       Symbol* signature = m->signature();
4639       Klass* k = this_klass->super();
4640       Method* super_m = NULL;
4641       while (k != NULL) {
4642         // skip supers that don't have final methods.
4643         if (k->has_final_method()) {
4644           // lookup a matching method in the super class hierarchy
4645           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4646           if (super_m == NULL) {
4647             break; // didn't find any match; get out
4648           }
4649 
4650           if (super_m->is_final() && !super_m->is_static() &&
4651               // matching method in super is final, and not static
4652               (Reflection::verify_field_access(this_klass(),
4653                                                super_m->method_holder(),
4654                                                super_m->method_holder(),
4655                                                super_m->access_flags(), false))
4656             // this class can access super final method and therefore override
4657             ) {
4658             ResourceMark rm(THREAD);
4659             Exceptions::fthrow(
4660               THREAD_AND_LOCATION,
4661               vmSymbols::java_lang_VerifyError(),
4662               "class %s overrides final method %s.%s%s",
4663               this_klass->external_name(),
4664               super_m->method_holder()->external_name(),
4665               name->as_C_string(),
4666               signature->as_C_string()
4667             );
4668             return;
4669           }
4670 
4671           // continue to look from super_m's holder's super.
4672           k = super_m->method_holder()->super();
4673           continue;
4674         }
4675 
4676         k = k->super();
4677       }
4678     }
4679   }
4680 }
4681 
4682 
4683 // assumes that this_klass is an interface
4684 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4685   assert(this_klass->is_interface(), "not an interface");
4686   Array<Method*>* methods = this_klass->methods();
4687   int num_methods = methods->length();
4688 
4689   for (int index = 0; index < num_methods; index++) {
4690     Method* m = methods->at(index);
4691     // if m is static and not the init method, throw a verify error
4692     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4693       ResourceMark rm(THREAD);
4694       Exceptions::fthrow(
4695         THREAD_AND_LOCATION,
4696         vmSymbols::java_lang_VerifyError(),
4697         "Illegal static method %s in interface %s",
4698         m->name()->as_C_string(),
4699         this_klass->external_name()
4700       );
4701       return;
4702     }
4703   }
4704 }
4705 
4706 // utility methods for format checking
4707 
4708 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4709   if (!_need_verify) { return; }
4710 
4711   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4712   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4713   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4714   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4715   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4716   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4717   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
4718 
4719   if ((is_abstract && is_final) ||
4720       (is_interface && !is_abstract) ||
4721       (is_interface && major_gte_15 && (is_super || is_enum)) ||
4722       (!is_interface && major_gte_15 && is_annotation)) {
4723     ResourceMark rm(THREAD);
4724     Exceptions::fthrow(
4725       THREAD_AND_LOCATION,
4726       vmSymbols::java_lang_ClassFormatError(),
4727       "Illegal class modifiers in class %s: 0x%X",
4728       _class_name->as_C_string(), flags
4729     );
4730     return;
4731   }
4732 }
4733 
4734 bool ClassFileParser::has_illegal_visibility(jint flags) {
4735   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4736   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4737   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4738 
4739   return ((is_public && is_protected) ||
4740           (is_public && is_private) ||
4741           (is_protected && is_private));
4742 }
4743 
4744 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4745   u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4746   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4747          (major <= max_version) &&
4748          ((major != max_version) ||
4749           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4750 }
4751 
4752 void ClassFileParser::verify_legal_field_modifiers(
4753     jint flags, bool is_interface, TRAPS) {
4754   if (!_need_verify) { return; }
4755 
4756   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4757   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4758   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4759   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4760   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4761   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4762   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4763   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4764   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4765 
4766   bool is_illegal = false;
4767 
4768   if (is_interface) {
4769     if (!is_public || !is_static || !is_final || is_private ||
4770         is_protected || is_volatile || is_transient ||
4771         (major_gte_15 && is_enum)) {
4772       is_illegal = true;
4773     }
4774   } else { // not interface
4775     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4776       is_illegal = true;
4777     }
4778   }
4779 
4780   if (is_illegal) {
4781     ResourceMark rm(THREAD);
4782     Exceptions::fthrow(
4783       THREAD_AND_LOCATION,
4784       vmSymbols::java_lang_ClassFormatError(),
4785       "Illegal field modifiers in class %s: 0x%X",
4786       _class_name->as_C_string(), flags);
4787     return;
4788   }
4789 }
4790 
4791 void ClassFileParser::verify_legal_method_modifiers(
4792     jint flags, bool is_interface, Symbol* name, TRAPS) {
4793   if (!_need_verify) { return; }
4794 
4795   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4796   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4797   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4798   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4799   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4800   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4801   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4802   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4803   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4804   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4805   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
4806   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4807   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4808 
4809   bool is_illegal = false;
4810 
4811   if (is_interface) {
4812     if (major_gte_8) {
4813       // Class file version is JAVA_8_VERSION or later Methods of
4814       // interfaces may set any of the flags except ACC_PROTECTED,
4815       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4816       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4817       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4818           (is_native || is_protected || is_final || is_synchronized) ||
4819           // If a specific method of a class or interface has its
4820           // ACC_ABSTRACT flag set, it must not have any of its
4821           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4822           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4823           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4824           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4825           (is_abstract && (is_private || is_static || is_strict))) {
4826         is_illegal = true;
4827       }
4828     } else if (major_gte_15) {
4829       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4830       if (!is_public || is_static || is_final || is_synchronized ||
4831           is_native || !is_abstract || is_strict) {
4832         is_illegal = true;
4833       }
4834     } else {
4835       // Class file version is pre-JAVA_1_5_VERSION
4836       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4837         is_illegal = true;
4838       }
4839     }
4840   } else { // not interface
4841     if (has_illegal_visibility(flags)) {
4842       is_illegal = true;
4843     } else {
4844       if (is_initializer) {
4845         if (is_static || is_final || is_synchronized || is_native ||
4846             is_abstract || (major_gte_15 && is_bridge)) {
4847           is_illegal = true;
4848         }
4849       } else { // not initializer
4850         if (is_abstract) {
4851           if ((is_final || is_native || is_private || is_static ||
4852               (major_gte_15 && (is_synchronized || is_strict)))) {
4853             is_illegal = true;
4854           }
4855         }
4856       }
4857     }
4858   }
4859 
4860   if (is_illegal) {
4861     ResourceMark rm(THREAD);
4862     Exceptions::fthrow(
4863       THREAD_AND_LOCATION,
4864       vmSymbols::java_lang_ClassFormatError(),
4865       "Method %s in class %s has illegal modifiers: 0x%X",
4866       name->as_C_string(), _class_name->as_C_string(), flags);
4867     return;
4868   }
4869 }
4870 
4871 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4872   assert(_need_verify, "only called when _need_verify is true");
4873   int i = 0;
4874   int count = length >> 2;
4875   for (int k=0; k<count; k++) {
4876     unsigned char b0 = buffer[i];
4877     unsigned char b1 = buffer[i+1];
4878     unsigned char b2 = buffer[i+2];
4879     unsigned char b3 = buffer[i+3];
4880     // For an unsigned char v,
4881     // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4882     // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4883     unsigned char res = b0 | b0 - 1 |
4884                         b1 | b1 - 1 |
4885                         b2 | b2 - 1 |
4886                         b3 | b3 - 1;
4887     if (res >= 128) break;
4888     i += 4;
4889   }
4890   for(; i < length; i++) {
4891     unsigned short c;
4892     // no embedded zeros
4893     guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4894     if(buffer[i] < 128) {
4895       continue;
4896     }
4897     if ((i + 5) < length) { // see if it's legal supplementary character
4898       if (UTF8::is_supplementary_character(&buffer[i])) {
4899         c = UTF8::get_supplementary_character(&buffer[i]);
4900         i += 5;
4901         continue;
4902       }
4903     }
4904     switch (buffer[i] >> 4) {
4905       default: break;
4906       case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4907         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4908       case 0xC: case 0xD:  // 110xxxxx  10xxxxxx
4909         c = (buffer[i] & 0x1F) << 6;
4910         i++;
4911         if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4912           c += buffer[i] & 0x3F;
4913           if (_major_version <= 47 || c == 0 || c >= 0x80) {
4914             // for classes with major > 47, c must a null or a character in its shortest form
4915             break;
4916           }
4917         }
4918         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4919       case 0xE:  // 1110xxxx 10xxxxxx 10xxxxxx
4920         c = (buffer[i] & 0xF) << 12;
4921         i += 2;
4922         if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4923           c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4924           if (_major_version <= 47 || c >= 0x800) {
4925             // for classes with major > 47, c must be in its shortest form
4926             break;
4927           }
4928         }
4929         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4930     }  // end of switch
4931   } // end of for
4932 }
4933 
4934 // Checks if name is a legal class name.
4935 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4936   if (!_need_verify || _relax_verify) { return; }
4937 
4938   char buf[fixed_buffer_size];
4939   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4940   unsigned int length = name->utf8_length();
4941   bool legal = false;
4942 
4943   if (length > 0) {
4944     char* p;
4945     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4946       p = skip_over_field_signature(bytes, false, length, CHECK);
4947       legal = (p != NULL) && ((p - bytes) == (int)length);
4948     } else if (_major_version < JAVA_1_5_VERSION) {
4949       if (bytes[0] != '<') {
4950         p = skip_over_field_name(bytes, true, length);
4951         legal = (p != NULL) && ((p - bytes) == (int)length);
4952       }
4953     } else {
4954       // 4900761: relax the constraints based on JSR202 spec
4955       // Class names may be drawn from the entire Unicode character set.
4956       // Identifiers between '/' must be unqualified names.
4957       // The utf8 string has been verified when parsing cpool entries.
4958       legal = verify_unqualified_name(bytes, length, LegalClass);
4959     }
4960   }
4961   if (!legal) {
4962     ResourceMark rm(THREAD);
4963     Exceptions::fthrow(
4964       THREAD_AND_LOCATION,
4965       vmSymbols::java_lang_ClassFormatError(),
4966       "Illegal class name \"%s\" in class file %s", bytes,
4967       _class_name->as_C_string()
4968     );
4969     return;
4970   }
4971 }
4972 
4973 // Checks if name is a legal field name.
4974 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4975   if (!_need_verify || _relax_verify) { return; }
4976 
4977   char buf[fixed_buffer_size];
4978   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4979   unsigned int length = name->utf8_length();
4980   bool legal = false;
4981 
4982   if (length > 0) {
4983     if (_major_version < JAVA_1_5_VERSION) {
4984       if (bytes[0] != '<') {
4985         char* p = skip_over_field_name(bytes, false, length);
4986         legal = (p != NULL) && ((p - bytes) == (int)length);
4987       }
4988     } else {
4989       // 4881221: relax the constraints based on JSR202 spec
4990       legal = verify_unqualified_name(bytes, length, LegalField);
4991     }
4992   }
4993 
4994   if (!legal) {
4995     ResourceMark rm(THREAD);
4996     Exceptions::fthrow(
4997       THREAD_AND_LOCATION,
4998       vmSymbols::java_lang_ClassFormatError(),
4999       "Illegal field name \"%s\" in class %s", bytes,
5000       _class_name->as_C_string()
5001     );
5002     return;
5003   }
5004 }
5005 
5006 // Checks if name is a legal method name.
5007 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5008   if (!_need_verify || _relax_verify) { return; }
5009 
5010   assert(name != NULL, "method name is null");
5011   char buf[fixed_buffer_size];
5012   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5013   unsigned int length = name->utf8_length();
5014   bool legal = false;
5015 
5016   if (length > 0) {
5017     if (bytes[0] == '<') {
5018       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5019         legal = true;
5020       }
5021     } else if (_major_version < JAVA_1_5_VERSION) {
5022       char* p;
5023       p = skip_over_field_name(bytes, false, length);
5024       legal = (p != NULL) && ((p - bytes) == (int)length);
5025     } else {
5026       // 4881221: relax the constraints based on JSR202 spec
5027       legal = verify_unqualified_name(bytes, length, LegalMethod);
5028     }
5029   }
5030 
5031   if (!legal) {
5032     ResourceMark rm(THREAD);
5033     Exceptions::fthrow(
5034       THREAD_AND_LOCATION,
5035       vmSymbols::java_lang_ClassFormatError(),
5036       "Illegal method name \"%s\" in class %s", bytes,
5037       _class_name->as_C_string()
5038     );
5039     return;
5040   }
5041 }
5042 
5043 
5044 // Checks if signature is a legal field signature.
5045 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5046   if (!_need_verify) { return; }
5047 
5048   char buf[fixed_buffer_size];
5049   char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5050   unsigned int length = signature->utf8_length();
5051   char* p = skip_over_field_signature(bytes, false, length, CHECK);
5052 
5053   if (p == NULL || (p - bytes) != (int)length) {
5054     throwIllegalSignature("Field", name, signature, CHECK);
5055   }
5056 }
5057 
5058 // Checks if signature is a legal method signature.
5059 // Returns number of parameters
5060 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5061   if (!_need_verify) {
5062     // make sure caller's args_size will be less than 0 even for non-static
5063     // method so it will be recomputed in compute_size_of_parameters().
5064     return -2;
5065   }
5066 
5067   unsigned int args_size = 0;
5068   char buf[fixed_buffer_size];
5069   char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5070   unsigned int length = signature->utf8_length();
5071   char* nextp;
5072 
5073   // The first character must be a '('
5074   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5075     length--;
5076     // Skip over legal field signatures
5077     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5078     while ((length > 0) && (nextp != NULL)) {
5079       args_size++;
5080       if (p[0] == 'J' || p[0] == 'D') {
5081         args_size++;
5082       }
5083       length -= nextp - p;
5084       p = nextp;
5085       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5086     }
5087     // The first non-signature thing better be a ')'
5088     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5089       length--;
5090       if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5091         // All internal methods must return void
5092         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5093           return args_size;
5094         }
5095       } else {
5096         // Now we better just have a return value
5097         nextp = skip_over_field_signature(p, true, length, CHECK_0);
5098         if (nextp && ((int)length == (nextp - p))) {
5099           return args_size;
5100         }
5101       }
5102     }
5103   }
5104   // Report error
5105   throwIllegalSignature("Method", name, signature, CHECK_0);
5106   return 0;
5107 }
5108 
5109 
5110 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5111 // Method names also may not contain the characters '<' or '>', unless <init>
5112 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
5113 // method.  Because these names have been checked as special cases before
5114 // calling this method in verify_legal_method_name.
5115 bool ClassFileParser::verify_unqualified_name(
5116     char* name, unsigned int length, int type) {
5117   jchar ch;
5118 
5119   for (char* p = name; p != name + length; ) {
5120     ch = *p;
5121     if (ch < 128) {
5122       p++;
5123       if (ch == '.' || ch == ';' || ch == '[' ) {
5124         return false;   // do not permit '.', ';', or '['
5125       }
5126       if (type != LegalClass && ch == '/') {
5127         return false;   // do not permit '/' unless it's class name
5128       }
5129       if (type == LegalMethod && (ch == '<' || ch == '>')) {
5130         return false;   // do not permit '<' or '>' in method names
5131       }
5132     } else {
5133       char* tmp_p = UTF8::next(p, &ch);
5134       p = tmp_p;
5135     }
5136   }
5137   return true;
5138 }
5139 
5140 
5141 // Take pointer to a string. Skip over the longest part of the string that could
5142 // be taken as a fieldname. Allow '/' if slash_ok is true.
5143 // Return a pointer to just past the fieldname.
5144 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5145 // being true, we saw consecutive slashes (meaning we were looking for a
5146 // qualified path but found something that was badly-formed).
5147 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5148   char* p;
5149   jchar ch;
5150   jboolean last_is_slash = false;
5151   jboolean not_first_ch = false;
5152 
5153   for (p = name; p != name + length; not_first_ch = true) {
5154     char* old_p = p;
5155     ch = *p;
5156     if (ch < 128) {
5157       p++;
5158       // quick check for ascii
5159       if ((ch >= 'a' && ch <= 'z') ||
5160           (ch >= 'A' && ch <= 'Z') ||
5161           (ch == '_' || ch == '$') ||
5162           (not_first_ch && ch >= '0' && ch <= '9')) {
5163         last_is_slash = false;
5164         continue;
5165       }
5166       if (slash_ok && ch == '/') {
5167         if (last_is_slash) {
5168           return NULL;  // Don't permit consecutive slashes
5169         }
5170         last_is_slash = true;
5171         continue;
5172       }
5173     } else {
5174       jint unicode_ch;
5175       char* tmp_p = UTF8::next_character(p, &unicode_ch);
5176       p = tmp_p;
5177       last_is_slash = false;
5178       // Check if ch is Java identifier start or is Java identifier part
5179       // 4672820: call java.lang.Character methods directly without generating separate tables.
5180       EXCEPTION_MARK;
5181       instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5182 
5183       // return value
5184       JavaValue result(T_BOOLEAN);
5185       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5186       JavaCallArguments args;
5187       args.push_int(unicode_ch);
5188 
5189       // public static boolean isJavaIdentifierStart(char ch);
5190       JavaCalls::call_static(&result,
5191                              klass,
5192                              vmSymbols::isJavaIdentifierStart_name(),
5193                              vmSymbols::int_bool_signature(),
5194                              &args,
5195                              THREAD);
5196 
5197       if (HAS_PENDING_EXCEPTION) {
5198         CLEAR_PENDING_EXCEPTION;
5199         return 0;
5200       }
5201       if (result.get_jboolean()) {
5202         continue;
5203       }
5204 
5205       if (not_first_ch) {
5206         // public static boolean isJavaIdentifierPart(char ch);
5207         JavaCalls::call_static(&result,
5208                                klass,
5209                                vmSymbols::isJavaIdentifierPart_name(),
5210                                vmSymbols::int_bool_signature(),
5211                                &args,
5212                                THREAD);
5213 
5214         if (HAS_PENDING_EXCEPTION) {
5215           CLEAR_PENDING_EXCEPTION;
5216           return 0;
5217         }
5218 
5219         if (result.get_jboolean()) {
5220           continue;
5221         }
5222       }
5223     }
5224     return (not_first_ch) ? old_p : NULL;
5225   }
5226   return (not_first_ch) ? p : NULL;
5227 }
5228 
5229 
5230 // Take pointer to a string. Skip over the longest part of the string that could
5231 // be taken as a field signature. Allow "void" if void_ok.
5232 // Return a pointer to just past the signature.
5233 // Return NULL if no legal signature is found.
5234 char* ClassFileParser::skip_over_field_signature(char* signature,
5235                                                  bool void_ok,
5236                                                  unsigned int length,
5237                                                  TRAPS) {
5238   unsigned int array_dim = 0;
5239   while (length > 0) {
5240     switch (signature[0]) {
5241       case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5242       case JVM_SIGNATURE_BOOLEAN:
5243       case JVM_SIGNATURE_BYTE:
5244       case JVM_SIGNATURE_CHAR:
5245       case JVM_SIGNATURE_SHORT:
5246       case JVM_SIGNATURE_INT:
5247       case JVM_SIGNATURE_FLOAT:
5248       case JVM_SIGNATURE_LONG:
5249       case JVM_SIGNATURE_DOUBLE:
5250         return signature + 1;
5251       case JVM_SIGNATURE_CLASS: {
5252         if (_major_version < JAVA_1_5_VERSION) {
5253           // Skip over the class name if one is there
5254           char* p = skip_over_field_name(signature + 1, true, --length);
5255 
5256           // The next character better be a semicolon
5257           if (p && (p - signature) > 1 && p[0] == ';') {
5258             return p + 1;
5259           }
5260         } else {
5261           // 4900761: For class version > 48, any unicode is allowed in class name.
5262           length--;
5263           signature++;
5264           while (length > 0 && signature[0] != ';') {
5265             if (signature[0] == '.') {
5266               classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5267             }
5268             length--;
5269             signature++;
5270           }
5271           if (signature[0] == ';') { return signature + 1; }
5272         }
5273 
5274         return NULL;
5275       }
5276       case JVM_SIGNATURE_ARRAY:
5277         array_dim++;
5278         if (array_dim > 255) {
5279           // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5280           classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5281         }
5282         // The rest of what's there better be a legal signature
5283         signature++;
5284         length--;
5285         void_ok = false;
5286         break;
5287 
5288       default:
5289         return NULL;
5290     }
5291   }
5292   return NULL;
5293 }