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 "gc/shared/gcLocker.hpp"
  37 #include "memory/allocation.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/exceptions.hpp"
  63 #include "utilities/globalDefinitions.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(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(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("bad constant pool tag value %u", cp->tag_at(index).value());
 496         ShouldNotReachHere();
 497         break;
 498     } // end of switch
 499   } // end of for
 500 
 501   if (_cp_patches != NULL) {
 502     // need to treat this_class specially...
 503     int this_class_index;
 504     {
 505       cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
 506       u1* mark = cfs->current();
 507       u2 flags         = cfs->get_u2_fast();
 508       this_class_index = cfs->get_u2_fast();
 509       cfs->set_current(mark);  // revert to mark
 510     }
 511 
 512     for (index = 1; index < length; index++) {          // Index 0 is unused
 513       if (has_cp_patch_at(index)) {
 514         guarantee_property(index != this_class_index,
 515                            "Illegal constant pool patch to self at %d in class file %s",
 516                            index, CHECK_(nullHandle));
 517         patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
 518       }
 519     }
 520   }
 521 
 522   if (!_need_verify) {
 523     return cp;
 524   }
 525 
 526   // second verification pass - checks the strings are of the right format.
 527   // but not yet to the other entries
 528   for (index = 1; index < length; index++) {
 529     jbyte tag = cp->tag_at(index).value();
 530     switch (tag) {
 531       case JVM_CONSTANT_UnresolvedClass: {
 532         Symbol*  class_name = cp->klass_name_at(index);
 533         // check the name, even if _cp_patches will overwrite it
 534         verify_legal_class_name(class_name, CHECK_(nullHandle));
 535         break;
 536       }
 537       case JVM_CONSTANT_NameAndType: {
 538         if (_need_verify && _major_version >= JAVA_7_VERSION) {
 539           int sig_index = cp->signature_ref_index_at(index);
 540           int name_index = cp->name_ref_index_at(index);
 541           Symbol*  name = cp->symbol_at(name_index);
 542           Symbol*  sig = cp->symbol_at(sig_index);
 543           if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
 544             verify_legal_method_signature(name, sig, CHECK_(nullHandle));
 545           } else {
 546             verify_legal_field_signature(name, sig, CHECK_(nullHandle));
 547           }
 548         }
 549         break;
 550       }
 551       case JVM_CONSTANT_InvokeDynamic:
 552       case JVM_CONSTANT_Fieldref:
 553       case JVM_CONSTANT_Methodref:
 554       case JVM_CONSTANT_InterfaceMethodref: {
 555         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 556         // already verified to be utf8
 557         int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 558         // already verified to be utf8
 559         int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
 560         Symbol*  name = cp->symbol_at(name_ref_index);
 561         Symbol*  signature = cp->symbol_at(signature_ref_index);
 562         if (tag == JVM_CONSTANT_Fieldref) {
 563           verify_legal_field_name(name, CHECK_(nullHandle));
 564           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 565             // Signature is verified above, when iterating NameAndType_info.
 566             // Need only to be sure it's the right type.
 567             if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
 568               throwIllegalSignature(
 569                   "Field", name, signature, CHECK_(nullHandle));
 570             }
 571           } else {
 572             verify_legal_field_signature(name, signature, CHECK_(nullHandle));
 573           }
 574         } else {
 575           verify_legal_method_name(name, CHECK_(nullHandle));
 576           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 577             // Signature is verified above, when iterating NameAndType_info.
 578             // Need only to be sure it's the right type.
 579             if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
 580               throwIllegalSignature(
 581                   "Method", name, signature, CHECK_(nullHandle));
 582             }
 583           } else {
 584             verify_legal_method_signature(name, signature, CHECK_(nullHandle));
 585           }
 586           if (tag == JVM_CONSTANT_Methodref) {
 587             // 4509014: If a class method name begins with '<', it must be "<init>".
 588             assert(name != NULL, "method name in constant pool is null");
 589             unsigned int name_len = name->utf8_length();
 590             assert(name_len > 0, "bad method name");  // already verified as legal name
 591             if (name->byte_at(0) == '<') {
 592               if (name != vmSymbols::object_initializer_name()) {
 593                 classfile_parse_error(
 594                   "Bad method name at constant pool index %u in class file %s",
 595                   name_ref_index, CHECK_(nullHandle));
 596               }
 597             }
 598           }
 599         }
 600         break;
 601       }
 602       case JVM_CONSTANT_MethodHandle: {
 603         int ref_index = cp->method_handle_index_at(index);
 604         int ref_kind  = cp->method_handle_ref_kind_at(index);
 605         switch (ref_kind) {
 606         case JVM_REF_invokeVirtual:
 607         case JVM_REF_invokeStatic:
 608         case JVM_REF_invokeSpecial:
 609         case JVM_REF_newInvokeSpecial:
 610           {
 611             int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
 612             int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 613             Symbol*  name = cp->symbol_at(name_ref_index);
 614             if (ref_kind == JVM_REF_newInvokeSpecial) {
 615               if (name != vmSymbols::object_initializer_name()) {
 616                 classfile_parse_error(
 617                   "Bad constructor name at constant pool index %u in class file %s",
 618                   name_ref_index, CHECK_(nullHandle));
 619               }
 620             } else {
 621               if (name == vmSymbols::object_initializer_name()) {
 622                 classfile_parse_error(
 623                   "Bad method name at constant pool index %u in class file %s",
 624                   name_ref_index, CHECK_(nullHandle));
 625               }
 626             }
 627           }
 628           break;
 629           // Other ref_kinds are already fully checked in previous pass.
 630         }
 631         break;
 632       }
 633       case JVM_CONSTANT_MethodType: {
 634         Symbol* no_name = vmSymbols::type_name(); // place holder
 635         Symbol*  signature = cp->method_type_signature_at(index);
 636         verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
 637         break;
 638       }
 639       case JVM_CONSTANT_Utf8: {
 640         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 641       }
 642     }  // end of switch
 643   }  // end of for
 644 
 645   return cp;
 646 }
 647 
 648 
 649 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
 650   BasicType patch_type = T_VOID;
 651 
 652   switch (cp->tag_at(index).value()) {
 653 
 654   case JVM_CONSTANT_UnresolvedClass :
 655     // Patching a class means pre-resolving it.
 656     // The name in the constant pool is ignored.
 657     if (java_lang_Class::is_instance(patch())) {
 658       guarantee_property(!java_lang_Class::is_primitive(patch()),
 659                          "Illegal class patch at %d in class file %s",
 660                          index, CHECK);
 661       cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
 662     } else {
 663       guarantee_property(java_lang_String::is_instance(patch()),
 664                          "Illegal class patch at %d in class file %s",
 665                          index, CHECK);
 666       Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
 667       cp->unresolved_klass_at_put(index, name);
 668     }
 669     break;
 670 
 671   case JVM_CONSTANT_String :
 672     // skip this patch and don't clear it.  Needs the oop array for resolved
 673     // references to be created first.
 674     return;
 675 
 676   case JVM_CONSTANT_Integer : patch_type = T_INT;    goto patch_prim;
 677   case JVM_CONSTANT_Float :   patch_type = T_FLOAT;  goto patch_prim;
 678   case JVM_CONSTANT_Long :    patch_type = T_LONG;   goto patch_prim;
 679   case JVM_CONSTANT_Double :  patch_type = T_DOUBLE; goto patch_prim;
 680   patch_prim:
 681     {
 682       jvalue value;
 683       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 684       guarantee_property(value_type == patch_type,
 685                          "Illegal primitive patch at %d in class file %s",
 686                          index, CHECK);
 687       switch (value_type) {
 688       case T_INT:    cp->int_at_put(index,   value.i); break;
 689       case T_FLOAT:  cp->float_at_put(index, value.f); break;
 690       case T_LONG:   cp->long_at_put(index,  value.j); break;
 691       case T_DOUBLE: cp->double_at_put(index, value.d); break;
 692       default:       assert(false, "");
 693       }
 694     }
 695     break;
 696 
 697   default:
 698     // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 699     guarantee_property(!has_cp_patch_at(index),
 700                        "Illegal unexpected patch at %d in class file %s",
 701                        index, CHECK);
 702     return;
 703   }
 704 
 705   // On fall-through, mark the patch as used.
 706   clear_cp_patch_at(index);
 707 }
 708 
 709 
 710 class NameSigHash: public ResourceObj {
 711  public:
 712   Symbol*       _name;       // name
 713   Symbol*       _sig;        // signature
 714   NameSigHash*  _next;       // Next entry in hash table
 715 };
 716 
 717 
 718 #define HASH_ROW_SIZE 256
 719 
 720 unsigned int hash(Symbol* name, Symbol* sig) {
 721   unsigned int raw_hash = 0;
 722   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 723   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 724 
 725   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 726 }
 727 
 728 
 729 void initialize_hashtable(NameSigHash** table) {
 730   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 731 }
 732 
 733 // Return false if the name/sig combination is found in table.
 734 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 735 // The old format checker uses heap sort to find duplicates.
 736 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 737 // of table since we don't expect Symbol*'s to move.
 738 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
 739   assert(name != NULL, "name in constant pool is NULL");
 740 
 741   // First lookup for duplicates
 742   int index = hash(name, sig);
 743   NameSigHash* entry = table[index];
 744   while (entry != NULL) {
 745     if (entry->_name == name && entry->_sig == sig) {
 746       return false;
 747     }
 748     entry = entry->_next;
 749   }
 750 
 751   // No duplicate is found, allocate a new entry and fill it.
 752   entry = new NameSigHash();
 753   entry->_name = name;
 754   entry->_sig = sig;
 755 
 756   // Insert into hash table
 757   entry->_next = table[index];
 758   table[index] = entry;
 759 
 760   return true;
 761 }
 762 
 763 
 764 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
 765                                                  Handle protection_domain,
 766                                                  Symbol* class_name,
 767                                                  bool* has_default_methods,
 768                                                  TRAPS) {
 769   if (length == 0) {
 770     _local_interfaces = Universe::the_empty_klass_array();
 771   } else {
 772     ClassFileStream* cfs = stream();
 773     assert(length > 0, "only called for length>0");
 774     _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
 775 
 776     int index;
 777     for (index = 0; index < length; index++) {
 778       u2 interface_index = cfs->get_u2(CHECK_NULL);
 779       KlassHandle interf;
 780       check_property(
 781         valid_klass_reference_at(interface_index),
 782         "Interface name has bad constant pool index %u in class file %s",
 783         interface_index, CHECK_NULL);
 784       if (_cp->tag_at(interface_index).is_klass()) {
 785         interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
 786       } else {
 787         Symbol*  unresolved_klass  = _cp->klass_name_at(interface_index);
 788 
 789         // Don't need to check legal name because it's checked when parsing constant pool.
 790         // But need to make sure it's not an array type.
 791         guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 792                            "Bad interface name in class file %s", CHECK_NULL);
 793         Handle class_loader(THREAD, _loader_data->class_loader());
 794 
 795         // Call resolve_super so classcircularity is checked
 796         Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
 797                       unresolved_klass, class_loader, protection_domain,
 798                       false, CHECK_NULL);
 799         interf = KlassHandle(THREAD, k);
 800       }
 801 
 802       if (!interf()->is_interface()) {
 803         THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
 804       }
 805       if (InstanceKlass::cast(interf())->has_default_methods()) {
 806         *has_default_methods = true;
 807       }
 808       _local_interfaces->at_put(index, interf());
 809     }
 810 
 811     if (!_need_verify || length <= 1) {
 812       return _local_interfaces;
 813     }
 814 
 815     // Check if there's any duplicates in interfaces
 816     ResourceMark rm(THREAD);
 817     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
 818       THREAD, NameSigHash*, HASH_ROW_SIZE);
 819     initialize_hashtable(interface_names);
 820     bool dup = false;
 821     {
 822       debug_only(No_Safepoint_Verifier nsv;)
 823       for (index = 0; index < length; index++) {
 824         Klass* k = _local_interfaces->at(index);
 825         Symbol* name = InstanceKlass::cast(k)->name();
 826         // If no duplicates, add (name, NULL) in hashtable interface_names.
 827         if (!put_after_lookup(name, NULL, interface_names)) {
 828           dup = true;
 829           break;
 830         }
 831       }
 832     }
 833     if (dup) {
 834       classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
 835     }
 836   }
 837   return _local_interfaces;
 838 }
 839 
 840 
 841 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
 842   // Make sure the constant pool entry is of a type appropriate to this field
 843   guarantee_property(
 844     (constantvalue_index > 0 &&
 845       constantvalue_index < _cp->length()),
 846     "Bad initial value index %u in ConstantValue attribute in class file %s",
 847     constantvalue_index, CHECK);
 848   constantTag value_type = _cp->tag_at(constantvalue_index);
 849   switch ( _cp->basic_type_for_signature_at(signature_index) ) {
 850     case T_LONG:
 851       guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
 852       break;
 853     case T_FLOAT:
 854       guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
 855       break;
 856     case T_DOUBLE:
 857       guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
 858       break;
 859     case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
 860       guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
 861       break;
 862     case T_OBJECT:
 863       guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 864                          && value_type.is_string()),
 865                          "Bad string initial value in class file %s", CHECK);
 866       break;
 867     default:
 868       classfile_parse_error(
 869         "Unable to set initial value %u in class file %s",
 870         constantvalue_index, CHECK);
 871   }
 872 }
 873 
 874 
 875 // Parse attributes for a field.
 876 void ClassFileParser::parse_field_attributes(u2 attributes_count,
 877                                              bool is_static, u2 signature_index,
 878                                              u2* constantvalue_index_addr,
 879                                              bool* is_synthetic_addr,
 880                                              u2* generic_signature_index_addr,
 881                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
 882                                              TRAPS) {
 883   ClassFileStream* cfs = stream();
 884   assert(attributes_count > 0, "length should be greater than 0");
 885   u2 constantvalue_index = 0;
 886   u2 generic_signature_index = 0;
 887   bool is_synthetic = false;
 888   u1* runtime_visible_annotations = NULL;
 889   int runtime_visible_annotations_length = 0;
 890   u1* runtime_invisible_annotations = NULL;
 891   int runtime_invisible_annotations_length = 0;
 892   u1* runtime_visible_type_annotations = NULL;
 893   int runtime_visible_type_annotations_length = 0;
 894   u1* runtime_invisible_type_annotations = NULL;
 895   int runtime_invisible_type_annotations_length = 0;
 896   bool runtime_invisible_annotations_exists = false;
 897   bool runtime_invisible_type_annotations_exists = false;
 898   while (attributes_count--) {
 899     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
 900     u2 attribute_name_index = cfs->get_u2_fast();
 901     u4 attribute_length = cfs->get_u4_fast();
 902     check_property(valid_symbol_at(attribute_name_index),
 903                    "Invalid field attribute index %u in class file %s",
 904                    attribute_name_index,
 905                    CHECK);
 906     Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
 907     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
 908       // ignore if non-static
 909       if (constantvalue_index != 0) {
 910         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
 911       }
 912       check_property(
 913         attribute_length == 2,
 914         "Invalid ConstantValue field attribute length %u in class file %s",
 915         attribute_length, CHECK);
 916       constantvalue_index = cfs->get_u2(CHECK);
 917       if (_need_verify) {
 918         verify_constantvalue(constantvalue_index, signature_index, CHECK);
 919       }
 920     } else if (attribute_name == vmSymbols::tag_synthetic()) {
 921       if (attribute_length != 0) {
 922         classfile_parse_error(
 923           "Invalid Synthetic field attribute length %u in class file %s",
 924           attribute_length, CHECK);
 925       }
 926       is_synthetic = true;
 927     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
 928       if (attribute_length != 0) {
 929         classfile_parse_error(
 930           "Invalid Deprecated field attribute length %u in class file %s",
 931           attribute_length, CHECK);
 932       }
 933     } else if (_major_version >= JAVA_1_5_VERSION) {
 934       if (attribute_name == vmSymbols::tag_signature()) {
 935         if (attribute_length != 2) {
 936           classfile_parse_error(
 937             "Wrong size %u for field's Signature attribute in class file %s",
 938             attribute_length, CHECK);
 939         }
 940         generic_signature_index = parse_generic_signature_attribute(CHECK);
 941       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
 942         if (runtime_visible_annotations != NULL) {
 943           classfile_parse_error(
 944             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
 945         }
 946         runtime_visible_annotations_length = attribute_length;
 947         runtime_visible_annotations = cfs->get_u1_buffer();
 948         assert(runtime_visible_annotations != NULL, "null visible annotations");
 949         parse_annotations(runtime_visible_annotations,
 950                           runtime_visible_annotations_length,
 951                           parsed_annotations);
 952         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
 953       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
 954         if (runtime_invisible_annotations_exists) {
 955           classfile_parse_error(
 956             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
 957         }
 958         runtime_invisible_annotations_exists = true;
 959         if (PreserveAllAnnotations) {
 960           runtime_invisible_annotations_length = attribute_length;
 961           runtime_invisible_annotations = cfs->get_u1_buffer();
 962           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
 963         }
 964         cfs->skip_u1(attribute_length, CHECK);
 965       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
 966         if (runtime_visible_type_annotations != NULL) {
 967           classfile_parse_error(
 968             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
 969         }
 970         runtime_visible_type_annotations_length = attribute_length;
 971         runtime_visible_type_annotations = cfs->get_u1_buffer();
 972         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
 973         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
 974       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
 975         if (runtime_invisible_type_annotations_exists) {
 976           classfile_parse_error(
 977             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
 978         } else {
 979           runtime_invisible_type_annotations_exists = true;
 980         }
 981         if (PreserveAllAnnotations) {
 982           runtime_invisible_type_annotations_length = attribute_length;
 983           runtime_invisible_type_annotations = cfs->get_u1_buffer();
 984           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
 985         }
 986         cfs->skip_u1(attribute_length, CHECK);
 987       } else {
 988         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 989       }
 990     } else {
 991       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 992     }
 993   }
 994 
 995   *constantvalue_index_addr = constantvalue_index;
 996   *is_synthetic_addr = is_synthetic;
 997   *generic_signature_index_addr = generic_signature_index;
 998   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
 999                                             runtime_visible_annotations_length,
1000                                             runtime_invisible_annotations,
1001                                             runtime_invisible_annotations_length,
1002                                             CHECK);
1003   parsed_annotations->set_field_annotations(a);
1004   a = assemble_annotations(runtime_visible_type_annotations,
1005                            runtime_visible_type_annotations_length,
1006                            runtime_invisible_type_annotations,
1007                            runtime_invisible_type_annotations_length,
1008                            CHECK);
1009   parsed_annotations->set_field_type_annotations(a);
1010   return;
1011 }
1012 
1013 
1014 // Field allocation types. Used for computing field offsets.
1015 
1016 enum FieldAllocationType {
1017   STATIC_OOP,           // Oops
1018   STATIC_BYTE,          // Boolean, Byte, char
1019   STATIC_SHORT,         // shorts
1020   STATIC_WORD,          // ints
1021   STATIC_DOUBLE,        // aligned long or double
1022   NONSTATIC_OOP,
1023   NONSTATIC_BYTE,
1024   NONSTATIC_SHORT,
1025   NONSTATIC_WORD,
1026   NONSTATIC_DOUBLE,
1027   MAX_FIELD_ALLOCATION_TYPE,
1028   BAD_ALLOCATION_TYPE = -1
1029 };
1030 
1031 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1032   BAD_ALLOCATION_TYPE, // 0
1033   BAD_ALLOCATION_TYPE, // 1
1034   BAD_ALLOCATION_TYPE, // 2
1035   BAD_ALLOCATION_TYPE, // 3
1036   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1037   NONSTATIC_SHORT,     // T_CHAR        =  5,
1038   NONSTATIC_WORD,      // T_FLOAT       =  6,
1039   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1040   NONSTATIC_BYTE,      // T_BYTE        =  8,
1041   NONSTATIC_SHORT,     // T_SHORT       =  9,
1042   NONSTATIC_WORD,      // T_INT         = 10,
1043   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1044   NONSTATIC_OOP,       // T_OBJECT      = 12,
1045   NONSTATIC_OOP,       // T_ARRAY       = 13,
1046   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1047   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1048   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1049   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1050   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1051   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1052   BAD_ALLOCATION_TYPE, // 0
1053   BAD_ALLOCATION_TYPE, // 1
1054   BAD_ALLOCATION_TYPE, // 2
1055   BAD_ALLOCATION_TYPE, // 3
1056   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1057   STATIC_SHORT,        // T_CHAR        =  5,
1058   STATIC_WORD,         // T_FLOAT       =  6,
1059   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1060   STATIC_BYTE,         // T_BYTE        =  8,
1061   STATIC_SHORT,        // T_SHORT       =  9,
1062   STATIC_WORD,         // T_INT         = 10,
1063   STATIC_DOUBLE,       // T_LONG        = 11,
1064   STATIC_OOP,          // T_OBJECT      = 12,
1065   STATIC_OOP,          // T_ARRAY       = 13,
1066   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1067   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1068   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1069   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1070   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1071   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1072 };
1073 
1074 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1075   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1076   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1077   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1078   return result;
1079 }
1080 
1081 class FieldAllocationCount: public ResourceObj {
1082  public:
1083   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1084 
1085   FieldAllocationCount() {
1086     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1087       count[i] = 0;
1088     }
1089   }
1090 
1091   FieldAllocationType update(bool is_static, BasicType type) {
1092     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1093     // Make sure there is no overflow with injected fields.
1094     assert(count[atype] < 0xFFFF, "More than 65535 fields");
1095     count[atype]++;
1096     return atype;
1097   }
1098 };
1099 
1100 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1101                                          bool is_interface,
1102                                          FieldAllocationCount *fac,
1103                                          u2* java_fields_count_ptr, TRAPS) {
1104   ClassFileStream* cfs = stream();
1105   cfs->guarantee_more(2, CHECK_NULL);  // length
1106   u2 length = cfs->get_u2_fast();
1107   *java_fields_count_ptr = length;
1108 
1109   int num_injected = 0;
1110   InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1111   int total_fields = length + num_injected;
1112 
1113   // The field array starts with tuples of shorts
1114   // [access, name index, sig index, initial value index, byte offset].
1115   // A generic signature slot only exists for field with generic
1116   // signature attribute. And the access flag is set with
1117   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1118   // signature slots are at the end of the field array and after all
1119   // other fields data.
1120   //
1121   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1122   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1123   //       ...
1124   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1125   //       [generic signature index]
1126   //       [generic signature index]
1127   //       ...
1128   //
1129   // Allocate a temporary resource array for field data. For each field,
1130   // a slot is reserved in the temporary array for the generic signature
1131   // index. After parsing all fields, the data are copied to a permanent
1132   // array and any unused slots will be discarded.
1133   ResourceMark rm(THREAD);
1134   u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1135              THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1136 
1137   // The generic signature slots start after all other fields' data.
1138   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1139   int num_generic_signature = 0;
1140   for (int n = 0; n < length; n++) {
1141     cfs->guarantee_more(8, CHECK_NULL);  // access_flags, name_index, descriptor_index, attributes_count
1142 
1143     AccessFlags access_flags;
1144     jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1145     verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1146     access_flags.set_flags(flags);
1147 
1148     u2 name_index = cfs->get_u2_fast();
1149     int cp_size = _cp->length();
1150     check_property(valid_symbol_at(name_index),
1151       "Invalid constant pool index %u for field name in class file %s",
1152       name_index,
1153       CHECK_NULL);
1154     Symbol*  name = _cp->symbol_at(name_index);
1155     verify_legal_field_name(name, CHECK_NULL);
1156 
1157     u2 signature_index = cfs->get_u2_fast();
1158     check_property(valid_symbol_at(signature_index),
1159       "Invalid constant pool index %u for field signature in class file %s",
1160       signature_index, CHECK_NULL);
1161     Symbol*  sig = _cp->symbol_at(signature_index);
1162     verify_legal_field_signature(name, sig, CHECK_NULL);
1163 
1164     u2 constantvalue_index = 0;
1165     bool is_synthetic = false;
1166     u2 generic_signature_index = 0;
1167     bool is_static = access_flags.is_static();
1168     FieldAnnotationCollector parsed_annotations(_loader_data);
1169 
1170     u2 attributes_count = cfs->get_u2_fast();
1171     if (attributes_count > 0) {
1172       parse_field_attributes(attributes_count, is_static, signature_index,
1173                              &constantvalue_index, &is_synthetic,
1174                              &generic_signature_index, &parsed_annotations,
1175                              CHECK_NULL);
1176       if (parsed_annotations.field_annotations() != NULL) {
1177         if (_fields_annotations == NULL) {
1178           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1179                                              _loader_data, length, NULL,
1180                                              CHECK_NULL);
1181         }
1182         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1183         parsed_annotations.set_field_annotations(NULL);
1184       }
1185       if (parsed_annotations.field_type_annotations() != NULL) {
1186         if (_fields_type_annotations == NULL) {
1187           _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1188                                                   _loader_data, length, NULL,
1189                                                   CHECK_NULL);
1190         }
1191         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1192         parsed_annotations.set_field_type_annotations(NULL);
1193       }
1194 
1195       if (is_synthetic) {
1196         access_flags.set_is_synthetic();
1197       }
1198       if (generic_signature_index != 0) {
1199         access_flags.set_field_has_generic_signature();
1200         fa[generic_signature_slot] = generic_signature_index;
1201         generic_signature_slot ++;
1202         num_generic_signature ++;
1203       }
1204     }
1205 
1206     FieldInfo* field = FieldInfo::from_field_array(fa, n);
1207     field->initialize(access_flags.as_short(),
1208                       name_index,
1209                       signature_index,
1210                       constantvalue_index);
1211     BasicType type = _cp->basic_type_for_signature_at(signature_index);
1212 
1213     // Remember how many oops we encountered and compute allocation type
1214     FieldAllocationType atype = fac->update(is_static, type);
1215     field->set_allocation_type(atype);
1216 
1217     // After field is initialized with type, we can augment it with aux info
1218     if (parsed_annotations.has_any_annotations())
1219       parsed_annotations.apply_to(field);
1220   }
1221 
1222   int index = length;
1223   if (num_injected != 0) {
1224     for (int n = 0; n < num_injected; n++) {
1225       // Check for duplicates
1226       if (injected[n].may_be_java) {
1227         Symbol* name      = injected[n].name();
1228         Symbol* signature = injected[n].signature();
1229         bool duplicate = false;
1230         for (int i = 0; i < length; i++) {
1231           FieldInfo* f = FieldInfo::from_field_array(fa, i);
1232           if (name      == _cp->symbol_at(f->name_index()) &&
1233               signature == _cp->symbol_at(f->signature_index())) {
1234             // Symbol is desclared in Java so skip this one
1235             duplicate = true;
1236             break;
1237           }
1238         }
1239         if (duplicate) {
1240           // These will be removed from the field array at the end
1241           continue;
1242         }
1243       }
1244 
1245       // Injected field
1246       FieldInfo* field = FieldInfo::from_field_array(fa, index);
1247       field->initialize(JVM_ACC_FIELD_INTERNAL,
1248                         injected[n].name_index,
1249                         injected[n].signature_index,
1250                         0);
1251 
1252       BasicType type = FieldType::basic_type(injected[n].signature());
1253 
1254       // Remember how many oops we encountered and compute allocation type
1255       FieldAllocationType atype = fac->update(false, type);
1256       field->set_allocation_type(atype);
1257       index++;
1258     }
1259   }
1260 
1261   // Now copy the fields' data from the temporary resource array.
1262   // Sometimes injected fields already exist in the Java source so
1263   // the fields array could be too long.  In that case the
1264   // fields array is trimed. Also unused slots that were reserved
1265   // for generic signature indexes are discarded.
1266   Array<u2>* fields = MetadataFactory::new_array<u2>(
1267           _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1268           CHECK_NULL);
1269   _fields = fields; // save in case of error
1270   {
1271     int i = 0;
1272     for (; i < index * FieldInfo::field_slots; i++) {
1273       fields->at_put(i, fa[i]);
1274     }
1275     for (int j = total_fields * FieldInfo::field_slots;
1276          j < generic_signature_slot; j++) {
1277       fields->at_put(i++, fa[j]);
1278     }
1279     assert(i == fields->length(), "");
1280   }
1281 
1282   if (_need_verify && length > 1) {
1283     // Check duplicated fields
1284     ResourceMark rm(THREAD);
1285     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1286       THREAD, NameSigHash*, HASH_ROW_SIZE);
1287     initialize_hashtable(names_and_sigs);
1288     bool dup = false;
1289     {
1290       debug_only(No_Safepoint_Verifier nsv;)
1291       for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1292         Symbol* name = fs.name();
1293         Symbol* sig = fs.signature();
1294         // If no duplicates, add name/signature in hashtable names_and_sigs.
1295         if (!put_after_lookup(name, sig, names_and_sigs)) {
1296           dup = true;
1297           break;
1298         }
1299       }
1300     }
1301     if (dup) {
1302       classfile_parse_error("Duplicate field name&signature in class file %s",
1303                             CHECK_NULL);
1304     }
1305   }
1306 
1307   return fields;
1308 }
1309 
1310 
1311 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1312   while (length-- > 0) {
1313     *dest++ = Bytes::get_Java_u2((u1*) (src++));
1314   }
1315 }
1316 
1317 
1318 u2* ClassFileParser::parse_exception_table(u4 code_length,
1319                                            u4 exception_table_length,
1320                                            TRAPS) {
1321   ClassFileStream* cfs = stream();
1322 
1323   u2* exception_table_start = cfs->get_u2_buffer();
1324   assert(exception_table_start != NULL, "null exception table");
1325   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1326   // Will check legal target after parsing code array in verifier.
1327   if (_need_verify) {
1328     for (unsigned int i = 0; i < exception_table_length; i++) {
1329       u2 start_pc = cfs->get_u2_fast();
1330       u2 end_pc = cfs->get_u2_fast();
1331       u2 handler_pc = cfs->get_u2_fast();
1332       u2 catch_type_index = cfs->get_u2_fast();
1333       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1334                          "Illegal exception table range in class file %s",
1335                          CHECK_NULL);
1336       guarantee_property(handler_pc < code_length,
1337                          "Illegal exception table handler in class file %s",
1338                          CHECK_NULL);
1339       if (catch_type_index != 0) {
1340         guarantee_property(valid_klass_reference_at(catch_type_index),
1341                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1342       }
1343     }
1344   } else {
1345     cfs->skip_u2_fast(exception_table_length * 4);
1346   }
1347   return exception_table_start;
1348 }
1349 
1350 void ClassFileParser::parse_linenumber_table(
1351     u4 code_attribute_length, u4 code_length,
1352     CompressedLineNumberWriteStream** write_stream, TRAPS) {
1353   ClassFileStream* cfs = stream();
1354   unsigned int num_entries = cfs->get_u2(CHECK);
1355 
1356   // Each entry is a u2 start_pc, and a u2 line_number
1357   unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1358 
1359   // Verify line number attribute and table length
1360   check_property(
1361     code_attribute_length == sizeof(u2) + length_in_bytes,
1362     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1363 
1364   cfs->guarantee_more(length_in_bytes, CHECK);
1365 
1366   if ((*write_stream) == NULL) {
1367     if (length_in_bytes > fixed_buffer_size) {
1368       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1369     } else {
1370       (*write_stream) = new CompressedLineNumberWriteStream(
1371         linenumbertable_buffer, fixed_buffer_size);
1372     }
1373   }
1374 
1375   while (num_entries-- > 0) {
1376     u2 bci  = cfs->get_u2_fast(); // start_pc
1377     u2 line = cfs->get_u2_fast(); // line_number
1378     guarantee_property(bci < code_length,
1379         "Invalid pc in LineNumberTable in class file %s", CHECK);
1380     (*write_stream)->write_pair(bci, line);
1381   }
1382 }
1383 
1384 
1385 class LVT_Hash : public AllStatic {
1386  public:
1387 
1388   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1389   /*
1390    * 3-tuple start_bci/length/slot has to be unique key,
1391    * so the following comparison seems to be redundant:
1392    *       && elem->name_cp_index == entry->_elem->name_cp_index
1393    */
1394     return (e0.start_bci     == e1.start_bci &&
1395             e0.length        == e1.length &&
1396             e0.name_cp_index == e1.name_cp_index &&
1397             e0.slot          == e1.slot);
1398   }
1399 
1400   static unsigned int hash(LocalVariableTableElement const& e0) {
1401     unsigned int raw_hash = e0.start_bci;
1402 
1403     raw_hash = e0.length        + raw_hash * 37;
1404     raw_hash = e0.name_cp_index + raw_hash * 37;
1405     raw_hash = e0.slot          + raw_hash * 37;
1406 
1407     return raw_hash;
1408   }
1409 };
1410 
1411 
1412 // Class file LocalVariableTable elements.
1413 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1414  public:
1415   u2 start_bci;
1416   u2 length;
1417   u2 name_cp_index;
1418   u2 descriptor_cp_index;
1419   u2 slot;
1420 };
1421 
1422 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1423   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1424   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1425   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1426   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1427   lvt->signature_cp_index  = 0;
1428   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1429 }
1430 
1431 // Function is used to parse both attributes:
1432 //       LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1433 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1434                                                u2 max_locals,
1435                                                u4 code_attribute_length,
1436                                                u2* localvariable_table_length,
1437                                                bool isLVTT,
1438                                                TRAPS) {
1439   ClassFileStream* cfs = stream();
1440   const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1441   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1442   unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1443   // Verify local variable table attribute has right length
1444   if (_need_verify) {
1445     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1446                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1447   }
1448   u2* localvariable_table_start = cfs->get_u2_buffer();
1449   assert(localvariable_table_start != NULL, "null local variable table");
1450   if (!_need_verify) {
1451     cfs->skip_u2_fast(size);
1452   } else {
1453     cfs->guarantee_more(size * 2, CHECK_NULL);
1454     for(int i = 0; i < (*localvariable_table_length); i++) {
1455       u2 start_pc = cfs->get_u2_fast();
1456       u2 length = cfs->get_u2_fast();
1457       u2 name_index = cfs->get_u2_fast();
1458       u2 descriptor_index = cfs->get_u2_fast();
1459       u2 index = cfs->get_u2_fast();
1460       // Assign to a u4 to avoid overflow
1461       u4 end_pc = (u4)start_pc + (u4)length;
1462 
1463       if (start_pc >= code_length) {
1464         classfile_parse_error(
1465           "Invalid start_pc %u in %s in class file %s",
1466           start_pc, tbl_name, CHECK_NULL);
1467       }
1468       if (end_pc > code_length) {
1469         classfile_parse_error(
1470           "Invalid length %u in %s in class file %s",
1471           length, tbl_name, CHECK_NULL);
1472       }
1473       int cp_size = _cp->length();
1474       guarantee_property(valid_symbol_at(name_index),
1475         "Name index %u in %s has bad constant type in class file %s",
1476         name_index, tbl_name, CHECK_NULL);
1477       guarantee_property(valid_symbol_at(descriptor_index),
1478         "Signature index %u in %s has bad constant type in class file %s",
1479         descriptor_index, tbl_name, CHECK_NULL);
1480 
1481       Symbol*  name = _cp->symbol_at(name_index);
1482       Symbol*  sig = _cp->symbol_at(descriptor_index);
1483       verify_legal_field_name(name, CHECK_NULL);
1484       u2 extra_slot = 0;
1485       if (!isLVTT) {
1486         verify_legal_field_signature(name, sig, CHECK_NULL);
1487 
1488         // 4894874: check special cases for double and long local variables
1489         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1490             sig == vmSymbols::type_signature(T_LONG)) {
1491           extra_slot = 1;
1492         }
1493       }
1494       guarantee_property((index + extra_slot) < max_locals,
1495                           "Invalid index %u in %s in class file %s",
1496                           index, tbl_name, CHECK_NULL);
1497     }
1498   }
1499   return localvariable_table_start;
1500 }
1501 
1502 
1503 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1504                                       u1* u1_array, u2* u2_array, TRAPS) {
1505   ClassFileStream* cfs = stream();
1506   u2 index = 0; // index in the array with long/double occupying two slots
1507   u4 i1 = *u1_index;
1508   u4 i2 = *u2_index + 1;
1509   for(int i = 0; i < array_length; i++) {
1510     u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1511     index++;
1512     if (tag == ITEM_Long || tag == ITEM_Double) {
1513       index++;
1514     } else if (tag == ITEM_Object) {
1515       u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1516       guarantee_property(valid_klass_reference_at(class_index),
1517                          "Bad class index %u in StackMap in class file %s",
1518                          class_index, CHECK);
1519     } else if (tag == ITEM_Uninitialized) {
1520       u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1521       guarantee_property(
1522         offset < code_length,
1523         "Bad uninitialized type offset %u in StackMap in class file %s",
1524         offset, CHECK);
1525     } else {
1526       guarantee_property(
1527         tag <= (u1)ITEM_Uninitialized,
1528         "Unknown variable type %u in StackMap in class file %s",
1529         tag, CHECK);
1530     }
1531   }
1532   u2_array[*u2_index] = index;
1533   *u1_index = i1;
1534   *u2_index = i2;
1535 }
1536 
1537 u1* ClassFileParser::parse_stackmap_table(
1538     u4 code_attribute_length, TRAPS) {
1539   if (code_attribute_length == 0)
1540     return NULL;
1541 
1542   ClassFileStream* cfs = stream();
1543   u1* stackmap_table_start = cfs->get_u1_buffer();
1544   assert(stackmap_table_start != NULL, "null stackmap table");
1545 
1546   // check code_attribute_length first
1547   stream()->skip_u1(code_attribute_length, CHECK_NULL);
1548 
1549   if (!_need_verify && !DumpSharedSpaces) {
1550     return NULL;
1551   }
1552   return stackmap_table_start;
1553 }
1554 
1555 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1556                                               u4 method_attribute_length,
1557                                               TRAPS) {
1558   ClassFileStream* cfs = stream();
1559   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1560   *checked_exceptions_length = cfs->get_u2_fast();
1561   unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1562   u2* checked_exceptions_start = cfs->get_u2_buffer();
1563   assert(checked_exceptions_start != NULL, "null checked exceptions");
1564   if (!_need_verify) {
1565     cfs->skip_u2_fast(size);
1566   } else {
1567     // Verify each value in the checked exception table
1568     u2 checked_exception;
1569     u2 len = *checked_exceptions_length;
1570     cfs->guarantee_more(2 * len, CHECK_NULL);
1571     for (int i = 0; i < len; i++) {
1572       checked_exception = cfs->get_u2_fast();
1573       check_property(
1574         valid_klass_reference_at(checked_exception),
1575         "Exception name has bad type at constant pool %u in class file %s",
1576         checked_exception, CHECK_NULL);
1577     }
1578   }
1579   // check exceptions attribute length
1580   if (_need_verify) {
1581     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1582                                                    sizeof(u2) * size),
1583                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1584   }
1585   return checked_exceptions_start;
1586 }
1587 
1588 void ClassFileParser::throwIllegalSignature(
1589     const char* type, Symbol* name, Symbol* sig, TRAPS) {
1590   ResourceMark rm(THREAD);
1591   Exceptions::fthrow(THREAD_AND_LOCATION,
1592       vmSymbols::java_lang_ClassFormatError(),
1593       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1594       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1595 }
1596 
1597 // Skip an annotation.  Return >=limit if there is any problem.
1598 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1599   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1600   // value := switch (tag:u1) { ... }
1601   index += 2;  // skip atype
1602   if ((index += 2) >= limit)  return limit;  // read nmem
1603   int nmem = Bytes::get_Java_u2(buffer+index-2);
1604   while (--nmem >= 0 && index < limit) {
1605     index += 2; // skip member
1606     index = skip_annotation_value(buffer, limit, index);
1607   }
1608   return index;
1609 }
1610 
1611 // Skip an annotation value.  Return >=limit if there is any problem.
1612 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1613   // value := switch (tag:u1) {
1614   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1615   //   case e: e_class:u2 e_name:u2;
1616   //   case s: s_con:u2;
1617   //   case [: do(nval:u2) {value};
1618   //   case @: annotation;
1619   //   case s: s_con:u2;
1620   // }
1621   if ((index += 1) >= limit)  return limit;  // read tag
1622   u1 tag = buffer[index-1];
1623   switch (tag) {
1624   case 'B': case 'C': case 'I': case 'S': case 'Z':
1625   case 'D': case 'F': case 'J': case 'c': case 's':
1626     index += 2;  // skip con or s_con
1627     break;
1628   case 'e':
1629     index += 4;  // skip e_class, e_name
1630     break;
1631   case '[':
1632     {
1633       if ((index += 2) >= limit)  return limit;  // read nval
1634       int nval = Bytes::get_Java_u2(buffer+index-2);
1635       while (--nval >= 0 && index < limit) {
1636         index = skip_annotation_value(buffer, limit, index);
1637       }
1638     }
1639     break;
1640   case '@':
1641     index = skip_annotation(buffer, limit, index);
1642     break;
1643   default:
1644     return limit;  //  bad tag byte
1645   }
1646   return index;
1647 }
1648 
1649 // Sift through annotations, looking for those significant to the VM:
1650 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1651                                         ClassFileParser::AnnotationCollector* coll) {
1652   // annotations := do(nann:u2) {annotation}
1653   int index = 0;
1654   if ((index += 2) >= limit)  return;  // read nann
1655   int nann = Bytes::get_Java_u2(buffer+index-2);
1656   enum {  // initial annotation layout
1657     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1658     count_off = 2,      // u2   such as 1 (one value)
1659     member_off = 4,     // utf8 such as 'value'
1660     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1661     e_tag_val = 'e',
1662       e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1663       e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1664       e_size = 11,     // end of 'e' annotation
1665     c_tag_val = 'c',    // payload is type
1666       c_con_off = 7,    // utf8 payload, such as 'I'
1667       c_size = 9,       // end of 'c' annotation
1668     s_tag_val = 's',    // payload is String
1669       s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1670       s_size = 9,
1671     min_size = 6        // smallest possible size (zero members)
1672   };
1673   while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1674     int index0 = index;
1675     index = skip_annotation(buffer, limit, index);
1676     u1* abase = buffer + index0;
1677     int atype = Bytes::get_Java_u2(abase + atype_off);
1678     int count = Bytes::get_Java_u2(abase + count_off);
1679     Symbol* aname = check_symbol_at(_cp, atype);
1680     if (aname == NULL)  break;  // invalid annotation name
1681     Symbol* member = NULL;
1682     if (count >= 1) {
1683       int member_index = Bytes::get_Java_u2(abase + member_off);
1684       member = check_symbol_at(_cp, member_index);
1685       if (member == NULL)  break;  // invalid member name
1686     }
1687 
1688     // Here is where parsing particular annotations will take place.
1689     AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1690     if (id == AnnotationCollector::_unknown)  continue;
1691     coll->set_annotation(id);
1692 
1693     if (id == AnnotationCollector::_sun_misc_Contended) {
1694       // @Contended can optionally specify the contention group.
1695       //
1696       // Contended group defines the equivalence class over the fields:
1697       // the fields within the same contended group are not treated distinct.
1698       // The only exception is default group, which does not incur the
1699       // equivalence. Naturally, contention group for classes is meaningless.
1700       //
1701       // While the contention group is specified as String, annotation
1702       // values are already interned, and we might as well use the constant
1703       // pool index as the group tag.
1704       //
1705       u2 group_index = 0; // default contended group
1706       if (count == 1
1707           && s_size == (index - index0)  // match size
1708           && s_tag_val == *(abase + tag_off)
1709           && member == vmSymbols::value_name()) {
1710         group_index = Bytes::get_Java_u2(abase + s_con_off);
1711         if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1712           group_index = 0; // default contended group
1713         }
1714       }
1715       coll->set_contended_group(group_index);
1716     }
1717   }
1718 }
1719 
1720 ClassFileParser::AnnotationCollector::ID
1721 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1722                                                                 Symbol* name) {
1723   vmSymbols::SID sid = vmSymbols::find_sid(name);
1724   // Privileged code can use all annotations.  Other code silently drops some.
1725   const bool privileged = loader_data->is_the_null_class_loader_data() ||
1726                           loader_data->is_ext_class_loader_data() ||
1727                           loader_data->is_anonymous();
1728   switch (sid) {
1729   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1730     if (_location != _in_method)  break;  // only allow for methods
1731     if (!privileged)              break;  // only allow in privileged code
1732     return _method_CallerSensitive;
1733   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1734     if (_location != _in_method)  break;  // only allow for methods
1735     if (!privileged)              break;  // only allow in privileged code
1736     return _method_ForceInline;
1737   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1738     if (_location != _in_method)  break;  // only allow for methods
1739     if (!privileged)              break;  // only allow in privileged code
1740     return _method_DontInline;
1741   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1742     if (_location != _in_method)  break;  // only allow for methods
1743     if (!privileged)              break;  // only allow in privileged code
1744     return _method_InjectedProfile;
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(jdk_internal_HotSpotIntrinsicCandidate_signature):
1754     if (_location != _in_method)  break;  // only allow for methods
1755     if (!privileged)              break;  // only allow in privileged code
1756     return _method_HotSpotIntrinsicCandidate;
1757   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1758     if (_location != _in_field)   break;  // only allow for fields
1759     if (!privileged)              break;  // only allow in privileged code
1760     return _field_Stable;
1761   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1762     if (_location != _in_field && _location != _in_class)          break;  // only allow for fields and classes
1763     if (!EnableContended || (RestrictContended && !privileged))    break;  // honor privileges
1764     return _sun_misc_Contended;
1765   default: break;
1766   }
1767   return AnnotationCollector::_unknown;
1768 }
1769 
1770 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1771   if (is_contended())
1772     f->set_contended_group(contended_group());
1773   if (is_stable())
1774     f->set_stable(true);
1775 }
1776 
1777 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1778   // If there's an error deallocate metadata for field annotations
1779   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1780   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1781 }
1782 
1783 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1784   if (has_annotation(_method_CallerSensitive))
1785     m->set_caller_sensitive(true);
1786   if (has_annotation(_method_ForceInline))
1787     m->set_force_inline(true);
1788   if (has_annotation(_method_DontInline))
1789     m->set_dont_inline(true);
1790   if (has_annotation(_method_InjectedProfile))
1791     m->set_has_injected_profile(true);
1792   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1793     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1794   if (has_annotation(_method_LambdaForm_Hidden))
1795     m->set_hidden(true);
1796   if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
1797     m->set_intrinsic_candidate(true);
1798 }
1799 
1800 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1801   k->set_is_contended(is_contended());
1802 }
1803 
1804 
1805 #define MAX_ARGS_SIZE 255
1806 #define MAX_CODE_SIZE 65535
1807 #define INITIAL_MAX_LVT_NUMBER 256
1808 
1809 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1810  *
1811  * Rules for LVT's and LVTT's are:
1812  *   - There can be any number of LVT's and LVTT's.
1813  *   - If there are n LVT's, it is the same as if there was just
1814  *     one LVT containing all the entries from the n LVT's.
1815  *   - There may be no more than one LVT entry per local variable.
1816  *     Two LVT entries are 'equal' if these fields are the same:
1817  *        start_pc, length, name, slot
1818  *   - There may be no more than one LVTT entry per each LVT entry.
1819  *     Each LVTT entry has to match some LVT entry.
1820  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1821  */
1822 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1823                                                int lvt_cnt,
1824                                                u2* localvariable_table_length,
1825                                                u2** localvariable_table_start,
1826                                                int lvtt_cnt,
1827                                                u2* localvariable_type_table_length,
1828                                                u2** localvariable_type_table_start,
1829                                                TRAPS) {
1830 
1831   ResourceMark rm(THREAD);
1832 
1833   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1834                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1835 
1836   LVT_HashTable* table = new LVT_HashTable();
1837 
1838   // To fill LocalVariableTable in
1839   Classfile_LVT_Element*  cf_lvt;
1840   LocalVariableTableElement* lvt = cm->localvariable_table_start();
1841 
1842   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1843     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1844     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1845       copy_lvt_element(&cf_lvt[idx], lvt);
1846       // If no duplicates, add LVT elem in hashtable.
1847       if (table->put(*lvt, lvt) == false
1848           && _need_verify
1849           && _major_version >= JAVA_1_5_VERSION) {
1850         classfile_parse_error("Duplicated LocalVariableTable attribute "
1851                               "entry for '%s' in class file %s",
1852                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1853                                CHECK);
1854       }
1855     }
1856   }
1857 
1858   // To merge LocalVariableTable and LocalVariableTypeTable
1859   Classfile_LVT_Element* cf_lvtt;
1860   LocalVariableTableElement lvtt_elem;
1861 
1862   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1863     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1864     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1865       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1866       LocalVariableTableElement** entry = table->get(lvtt_elem);
1867       if (entry == NULL) {
1868         if (_need_verify) {
1869           classfile_parse_error("LVTT entry for '%s' in class file %s "
1870                                 "does not match any LVT entry",
1871                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1872                                  CHECK);
1873         }
1874       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1875         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1876                               "entry for '%s' in class file %s",
1877                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1878                                CHECK);
1879       } else {
1880         // to add generic signatures into LocalVariableTable
1881         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1882       }
1883     }
1884   }
1885 }
1886 
1887 
1888 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1889                                        u1* runtime_visible_annotations,
1890                                        int runtime_visible_annotations_length,
1891                                        u1* runtime_invisible_annotations,
1892                                        int runtime_invisible_annotations_length,
1893                                        u1* runtime_visible_parameter_annotations,
1894                                        int runtime_visible_parameter_annotations_length,
1895                                        u1* runtime_invisible_parameter_annotations,
1896                                        int runtime_invisible_parameter_annotations_length,
1897                                        u1* runtime_visible_type_annotations,
1898                                        int runtime_visible_type_annotations_length,
1899                                        u1* runtime_invisible_type_annotations,
1900                                        int runtime_invisible_type_annotations_length,
1901                                        u1* annotation_default,
1902                                        int annotation_default_length,
1903                                        TRAPS) {
1904 
1905   AnnotationArray* a;
1906 
1907   if (runtime_visible_annotations_length +
1908       runtime_invisible_annotations_length > 0) {
1909      a = assemble_annotations(runtime_visible_annotations,
1910                               runtime_visible_annotations_length,
1911                               runtime_invisible_annotations,
1912                               runtime_invisible_annotations_length,
1913                               CHECK);
1914      cm->set_method_annotations(a);
1915   }
1916 
1917   if (runtime_visible_parameter_annotations_length +
1918       runtime_invisible_parameter_annotations_length > 0) {
1919     a = assemble_annotations(runtime_visible_parameter_annotations,
1920                              runtime_visible_parameter_annotations_length,
1921                              runtime_invisible_parameter_annotations,
1922                              runtime_invisible_parameter_annotations_length,
1923                              CHECK);
1924     cm->set_parameter_annotations(a);
1925   }
1926 
1927   if (annotation_default_length > 0) {
1928     a = assemble_annotations(annotation_default,
1929                              annotation_default_length,
1930                              NULL,
1931                              0,
1932                              CHECK);
1933     cm->set_default_annotations(a);
1934   }
1935 
1936   if (runtime_visible_type_annotations_length +
1937       runtime_invisible_type_annotations_length > 0) {
1938     a = assemble_annotations(runtime_visible_type_annotations,
1939                              runtime_visible_type_annotations_length,
1940                              runtime_invisible_type_annotations,
1941                              runtime_invisible_type_annotations_length,
1942                              CHECK);
1943     cm->set_type_annotations(a);
1944   }
1945 }
1946 
1947 
1948 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1949 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1950 // Method* to save footprint, so we only know the size of the resulting Method* when the
1951 // entire method attribute is parsed.
1952 //
1953 // The promoted_flags parameter is used to pass relevant access_flags
1954 // from the method back up to the containing klass. These flag values
1955 // are added to klass's access_flags.
1956 
1957 methodHandle ClassFileParser::parse_method(bool is_interface,
1958                                            AccessFlags *promoted_flags,
1959                                            TRAPS) {
1960   ClassFileStream* cfs = stream();
1961   methodHandle nullHandle;
1962   ResourceMark rm(THREAD);
1963   // Parse fixed parts
1964   cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1965 
1966   int flags = cfs->get_u2_fast();
1967   u2 name_index = cfs->get_u2_fast();
1968   int cp_size = _cp->length();
1969   check_property(
1970     valid_symbol_at(name_index),
1971     "Illegal constant pool index %u for method name in class file %s",
1972     name_index, CHECK_(nullHandle));
1973   Symbol*  name = _cp->symbol_at(name_index);
1974   verify_legal_method_name(name, CHECK_(nullHandle));
1975 
1976   u2 signature_index = cfs->get_u2_fast();
1977   guarantee_property(
1978     valid_symbol_at(signature_index),
1979     "Illegal constant pool index %u for method signature in class file %s",
1980     signature_index, CHECK_(nullHandle));
1981   Symbol*  signature = _cp->symbol_at(signature_index);
1982 
1983   AccessFlags access_flags;
1984   if (name == vmSymbols::class_initializer_name()) {
1985     // We ignore the other access flags for a valid class initializer.
1986     // (JVM Spec 2nd ed., chapter 4.6)
1987     if (_major_version < 51) { // backward compatibility
1988       flags = JVM_ACC_STATIC;
1989     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1990       flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
1991     } else {
1992       // As of major_version 51, a method named <clinit> without ACC_STATIC is
1993       // just another method. So, do a normal method modifer check.
1994       verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1995     }
1996   } else {
1997     verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
1998   }
1999 
2000   int args_size = -1;  // only used when _need_verify is true
2001   if (_need_verify) {
2002     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2003                  verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2004     if (args_size > MAX_ARGS_SIZE) {
2005       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2006     }
2007   }
2008 
2009   access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2010 
2011   // Default values for code and exceptions attribute elements
2012   u2 max_stack = 0;
2013   u2 max_locals = 0;
2014   u4 code_length = 0;
2015   u1* code_start = 0;
2016   u2 exception_table_length = 0;
2017   u2* exception_table_start = NULL;
2018   Array<int>* exception_handlers = Universe::the_empty_int_array();
2019   u2 checked_exceptions_length = 0;
2020   u2* checked_exceptions_start = NULL;
2021   CompressedLineNumberWriteStream* linenumber_table = NULL;
2022   int linenumber_table_length = 0;
2023   int total_lvt_length = 0;
2024   u2 lvt_cnt = 0;
2025   u2 lvtt_cnt = 0;
2026   bool lvt_allocated = false;
2027   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2028   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2029   u2* localvariable_table_length = NULL;
2030   u2** localvariable_table_start = NULL;
2031   u2* localvariable_type_table_length = NULL;
2032   u2** localvariable_type_table_start = NULL;
2033   int method_parameters_length = -1;
2034   u1* method_parameters_data = NULL;
2035   bool method_parameters_seen = false;
2036   bool parsed_code_attribute = false;
2037   bool parsed_checked_exceptions_attribute = false;
2038   bool parsed_stackmap_attribute = false;
2039   // stackmap attribute - JDK1.5
2040   u1* stackmap_data = NULL;
2041   int stackmap_data_length = 0;
2042   u2 generic_signature_index = 0;
2043   MethodAnnotationCollector parsed_annotations;
2044   u1* runtime_visible_annotations = NULL;
2045   int runtime_visible_annotations_length = 0;
2046   u1* runtime_invisible_annotations = NULL;
2047   int runtime_invisible_annotations_length = 0;
2048   u1* runtime_visible_parameter_annotations = NULL;
2049   int runtime_visible_parameter_annotations_length = 0;
2050   u1* runtime_invisible_parameter_annotations = NULL;
2051   int runtime_invisible_parameter_annotations_length = 0;
2052   u1* runtime_visible_type_annotations = NULL;
2053   int runtime_visible_type_annotations_length = 0;
2054   u1* runtime_invisible_type_annotations = NULL;
2055   int runtime_invisible_type_annotations_length = 0;
2056   bool runtime_invisible_annotations_exists = false;
2057   bool runtime_invisible_type_annotations_exists = false;
2058   bool runtime_invisible_parameter_annotations_exists = false;
2059   u1* annotation_default = NULL;
2060   int annotation_default_length = 0;
2061 
2062   // Parse code and exceptions attribute
2063   u2 method_attributes_count = cfs->get_u2_fast();
2064   while (method_attributes_count--) {
2065     cfs->guarantee_more(6, CHECK_(nullHandle));  // method_attribute_name_index, method_attribute_length
2066     u2 method_attribute_name_index = cfs->get_u2_fast();
2067     u4 method_attribute_length = cfs->get_u4_fast();
2068     check_property(
2069       valid_symbol_at(method_attribute_name_index),
2070       "Invalid method attribute name index %u in class file %s",
2071       method_attribute_name_index, CHECK_(nullHandle));
2072 
2073     Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2074     if (method_attribute_name == vmSymbols::tag_code()) {
2075       // Parse Code attribute
2076       if (_need_verify) {
2077         guarantee_property(
2078             !access_flags.is_native() && !access_flags.is_abstract(),
2079                         "Code attribute in native or abstract methods in class file %s",
2080                          CHECK_(nullHandle));
2081       }
2082       if (parsed_code_attribute) {
2083         classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2084       }
2085       parsed_code_attribute = true;
2086 
2087       // Stack size, locals size, and code size
2088       if (_major_version == 45 && _minor_version <= 2) {
2089         cfs->guarantee_more(4, CHECK_(nullHandle));
2090         max_stack = cfs->get_u1_fast();
2091         max_locals = cfs->get_u1_fast();
2092         code_length = cfs->get_u2_fast();
2093       } else {
2094         cfs->guarantee_more(8, CHECK_(nullHandle));
2095         max_stack = cfs->get_u2_fast();
2096         max_locals = cfs->get_u2_fast();
2097         code_length = cfs->get_u4_fast();
2098       }
2099       if (_need_verify) {
2100         guarantee_property(args_size <= max_locals,
2101                            "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2102         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2103                            "Invalid method Code length %u in class file %s",
2104                            code_length, CHECK_(nullHandle));
2105       }
2106       // Code pointer
2107       code_start = cfs->get_u1_buffer();
2108       assert(code_start != NULL, "null code start");
2109       cfs->guarantee_more(code_length, CHECK_(nullHandle));
2110       cfs->skip_u1_fast(code_length);
2111 
2112       // Exception handler table
2113       cfs->guarantee_more(2, CHECK_(nullHandle));  // exception_table_length
2114       exception_table_length = cfs->get_u2_fast();
2115       if (exception_table_length > 0) {
2116         exception_table_start =
2117               parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2118       }
2119 
2120       // Parse additional attributes in code attribute
2121       cfs->guarantee_more(2, CHECK_(nullHandle));  // code_attributes_count
2122       u2 code_attributes_count = cfs->get_u2_fast();
2123 
2124       unsigned int calculated_attribute_length = 0;
2125 
2126       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2127         calculated_attribute_length =
2128             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2129       } else {
2130         // max_stack, locals and length are smaller in pre-version 45.2 classes
2131         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2132       }
2133       calculated_attribute_length +=
2134         code_length +
2135         sizeof(exception_table_length) +
2136         sizeof(code_attributes_count) +
2137         exception_table_length *
2138             ( sizeof(u2) +   // start_pc
2139               sizeof(u2) +   // end_pc
2140               sizeof(u2) +   // handler_pc
2141               sizeof(u2) );  // catch_type_index
2142 
2143       while (code_attributes_count--) {
2144         cfs->guarantee_more(6, CHECK_(nullHandle));  // code_attribute_name_index, code_attribute_length
2145         u2 code_attribute_name_index = cfs->get_u2_fast();
2146         u4 code_attribute_length = cfs->get_u4_fast();
2147         calculated_attribute_length += code_attribute_length +
2148                                        sizeof(code_attribute_name_index) +
2149                                        sizeof(code_attribute_length);
2150         check_property(valid_symbol_at(code_attribute_name_index),
2151                        "Invalid code attribute name index %u in class file %s",
2152                        code_attribute_name_index,
2153                        CHECK_(nullHandle));
2154         if (LoadLineNumberTables &&
2155             _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2156           // Parse and compress line number table
2157           parse_linenumber_table(code_attribute_length, code_length,
2158             &linenumber_table, CHECK_(nullHandle));
2159 
2160         } else if (LoadLocalVariableTables &&
2161                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2162           // Parse local variable table
2163           if (!lvt_allocated) {
2164             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2165               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2166             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2167               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2168             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2169               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2170             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2171               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2172             lvt_allocated = true;
2173           }
2174           if (lvt_cnt == max_lvt_cnt) {
2175             max_lvt_cnt <<= 1;
2176             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2177             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2178           }
2179           localvariable_table_start[lvt_cnt] =
2180             parse_localvariable_table(code_length,
2181                                       max_locals,
2182                                       code_attribute_length,
2183                                       &localvariable_table_length[lvt_cnt],
2184                                       false,    // is not LVTT
2185                                       CHECK_(nullHandle));
2186           total_lvt_length += localvariable_table_length[lvt_cnt];
2187           lvt_cnt++;
2188         } else if (LoadLocalVariableTypeTables &&
2189                    _major_version >= JAVA_1_5_VERSION &&
2190                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2191           if (!lvt_allocated) {
2192             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2193               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2194             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2195               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2196             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2197               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2198             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2199               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2200             lvt_allocated = true;
2201           }
2202           // Parse local variable type table
2203           if (lvtt_cnt == max_lvtt_cnt) {
2204             max_lvtt_cnt <<= 1;
2205             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2206             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2207           }
2208           localvariable_type_table_start[lvtt_cnt] =
2209             parse_localvariable_table(code_length,
2210                                       max_locals,
2211                                       code_attribute_length,
2212                                       &localvariable_type_table_length[lvtt_cnt],
2213                                       true,     // is LVTT
2214                                       CHECK_(nullHandle));
2215           lvtt_cnt++;
2216         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2217                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2218           // Stack map is only needed by the new verifier in JDK1.5.
2219           if (parsed_stackmap_attribute) {
2220             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2221           }
2222           stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2223           stackmap_data_length = code_attribute_length;
2224           parsed_stackmap_attribute = true;
2225         } else {
2226           // Skip unknown attributes
2227           cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2228         }
2229       }
2230       // check method attribute length
2231       if (_need_verify) {
2232         guarantee_property(method_attribute_length == calculated_attribute_length,
2233                            "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2234       }
2235     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2236       // Parse Exceptions attribute
2237       if (parsed_checked_exceptions_attribute) {
2238         classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2239       }
2240       parsed_checked_exceptions_attribute = true;
2241       checked_exceptions_start =
2242             parse_checked_exceptions(&checked_exceptions_length,
2243                                      method_attribute_length,
2244                                      CHECK_(nullHandle));
2245     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2246       // reject multiple method parameters
2247       if (method_parameters_seen) {
2248         classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2249       }
2250       method_parameters_seen = true;
2251       method_parameters_length = cfs->get_u1_fast();
2252       const u2 real_length = (method_parameters_length * 4u) + 1u;
2253       if (method_attribute_length != real_length) {
2254         classfile_parse_error(
2255           "Invalid MethodParameters method attribute length %u in class file",
2256           method_attribute_length, CHECK_(nullHandle));
2257       }
2258       method_parameters_data = cfs->get_u1_buffer();
2259       cfs->skip_u2_fast(method_parameters_length);
2260       cfs->skip_u2_fast(method_parameters_length);
2261       // ignore this attribute if it cannot be reflected
2262       if (!SystemDictionary::Parameter_klass_loaded())
2263         method_parameters_length = -1;
2264     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2265       if (method_attribute_length != 0) {
2266         classfile_parse_error(
2267           "Invalid Synthetic method attribute length %u in class file %s",
2268           method_attribute_length, CHECK_(nullHandle));
2269       }
2270       // Should we check that there hasn't already been a synthetic attribute?
2271       access_flags.set_is_synthetic();
2272     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2273       if (method_attribute_length != 0) {
2274         classfile_parse_error(
2275           "Invalid Deprecated method attribute length %u in class file %s",
2276           method_attribute_length, CHECK_(nullHandle));
2277       }
2278     } else if (_major_version >= JAVA_1_5_VERSION) {
2279       if (method_attribute_name == vmSymbols::tag_signature()) {
2280         if (method_attribute_length != 2) {
2281           classfile_parse_error(
2282             "Invalid Signature attribute length %u in class file %s",
2283             method_attribute_length, CHECK_(nullHandle));
2284         }
2285         generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2286       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2287         if (runtime_visible_annotations != NULL) {
2288           classfile_parse_error(
2289             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2290         }
2291         runtime_visible_annotations_length = method_attribute_length;
2292         runtime_visible_annotations = cfs->get_u1_buffer();
2293         assert(runtime_visible_annotations != NULL, "null visible annotations");
2294         parse_annotations(runtime_visible_annotations,
2295             runtime_visible_annotations_length, &parsed_annotations);
2296         cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2297       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2298         if (runtime_invisible_annotations_exists) {
2299           classfile_parse_error(
2300             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2301         }
2302         runtime_invisible_annotations_exists = true;
2303         if (PreserveAllAnnotations) {
2304           runtime_invisible_annotations_length = method_attribute_length;
2305           runtime_invisible_annotations = cfs->get_u1_buffer();
2306           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2307         }
2308         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2309       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2310         if (runtime_visible_parameter_annotations != NULL) {
2311           classfile_parse_error(
2312             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2313         }
2314         runtime_visible_parameter_annotations_length = method_attribute_length;
2315         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2316         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2317         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2318       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2319         if (runtime_invisible_parameter_annotations_exists) {
2320           classfile_parse_error(
2321             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2322         }
2323         runtime_invisible_parameter_annotations_exists = true;
2324         if (PreserveAllAnnotations) {
2325           runtime_invisible_parameter_annotations_length = method_attribute_length;
2326           runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2327           assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2328         }
2329         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2330       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2331         if (annotation_default != NULL) {
2332           classfile_parse_error(
2333             "Multiple AnnotationDefault attributes for method in class file %s",
2334             CHECK_(nullHandle));
2335         }
2336         annotation_default_length = method_attribute_length;
2337         annotation_default = cfs->get_u1_buffer();
2338         assert(annotation_default != NULL, "null annotation default");
2339         cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2340       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2341         if (runtime_visible_type_annotations != NULL) {
2342           classfile_parse_error(
2343             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2344             CHECK_(nullHandle));
2345         }
2346         runtime_visible_type_annotations_length = method_attribute_length;
2347         runtime_visible_type_annotations = cfs->get_u1_buffer();
2348         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2349         // No need for the VM to parse Type annotations
2350         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2351       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2352         if (runtime_invisible_type_annotations_exists) {
2353           classfile_parse_error(
2354             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2355             CHECK_(nullHandle));
2356         } else {
2357           runtime_invisible_type_annotations_exists = true;
2358         }
2359         if (PreserveAllAnnotations) {
2360           runtime_invisible_type_annotations_length = method_attribute_length;
2361           runtime_invisible_type_annotations = cfs->get_u1_buffer();
2362           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2363         }
2364         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2365       } else {
2366         // Skip unknown attributes
2367         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2368       }
2369     } else {
2370       // Skip unknown attributes
2371       cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2372     }
2373   }
2374 
2375   if (linenumber_table != NULL) {
2376     linenumber_table->write_terminator();
2377     linenumber_table_length = linenumber_table->position();
2378   }
2379 
2380   // Make sure there's at least one Code attribute in non-native/non-abstract method
2381   if (_need_verify) {
2382     guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2383                       "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2384   }
2385 
2386   // All sizing information for a Method* is finally available, now create it
2387   InlineTableSizes sizes(
2388       total_lvt_length,
2389       linenumber_table_length,
2390       exception_table_length,
2391       checked_exceptions_length,
2392       method_parameters_length,
2393       generic_signature_index,
2394       runtime_visible_annotations_length +
2395            runtime_invisible_annotations_length,
2396       runtime_visible_parameter_annotations_length +
2397            runtime_invisible_parameter_annotations_length,
2398       runtime_visible_type_annotations_length +
2399            runtime_invisible_type_annotations_length,
2400       annotation_default_length,
2401       0);
2402 
2403   Method* m = Method::allocate(
2404       _loader_data, code_length, access_flags, &sizes,
2405       ConstMethod::NORMAL, CHECK_(nullHandle));
2406 
2407   ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2408 
2409   // Fill in information from fixed part (access_flags already set)
2410   m->set_constants(_cp);
2411   m->set_name_index(name_index);
2412   m->set_signature_index(signature_index);
2413 #ifdef CC_INTERP
2414   // hmm is there a gc issue here??
2415   ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2416   m->set_result_index(rtf.type());
2417 #endif
2418 
2419   if (args_size >= 0) {
2420     m->set_size_of_parameters(args_size);
2421   } else {
2422     m->compute_size_of_parameters(THREAD);
2423   }
2424 #ifdef ASSERT
2425   if (args_size >= 0) {
2426     m->compute_size_of_parameters(THREAD);
2427     assert(args_size == m->size_of_parameters(), "");
2428   }
2429 #endif
2430 
2431   // Fill in code attribute information
2432   m->set_max_stack(max_stack);
2433   m->set_max_locals(max_locals);
2434   if (stackmap_data != NULL) {
2435     m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2436                                          stackmap_data_length, CHECK_NULL);
2437   }
2438 
2439   // Copy byte codes
2440   m->set_code(code_start);
2441 
2442   // Copy line number table
2443   if (linenumber_table != NULL) {
2444     memcpy(m->compressed_linenumber_table(),
2445            linenumber_table->buffer(), linenumber_table_length);
2446   }
2447 
2448   // Copy exception table
2449   if (exception_table_length > 0) {
2450     int size =
2451       exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2452     copy_u2_with_conversion((u2*) m->exception_table_start(),
2453                              exception_table_start, size);
2454   }
2455 
2456   // Copy method parameters
2457   if (method_parameters_length > 0) {
2458     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2459     for (int i = 0; i < method_parameters_length; i++) {
2460       elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2461       method_parameters_data += 2;
2462       elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2463       method_parameters_data += 2;
2464     }
2465   }
2466 
2467   // Copy checked exceptions
2468   if (checked_exceptions_length > 0) {
2469     int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2470     copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2471   }
2472 
2473   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2474   if (total_lvt_length > 0) {
2475     promoted_flags->set_has_localvariable_table();
2476     copy_localvariable_table(m->constMethod(), lvt_cnt,
2477                              localvariable_table_length,
2478                              localvariable_table_start,
2479                              lvtt_cnt,
2480                              localvariable_type_table_length,
2481                              localvariable_type_table_start, CHECK_NULL);
2482   }
2483 
2484   if (parsed_annotations.has_any_annotations())
2485     parsed_annotations.apply_to(m);
2486 
2487   // Copy annotations
2488   copy_method_annotations(m->constMethod(),
2489                           runtime_visible_annotations,
2490                           runtime_visible_annotations_length,
2491                           runtime_invisible_annotations,
2492                           runtime_invisible_annotations_length,
2493                           runtime_visible_parameter_annotations,
2494                           runtime_visible_parameter_annotations_length,
2495                           runtime_invisible_parameter_annotations,
2496                           runtime_invisible_parameter_annotations_length,
2497                           runtime_visible_type_annotations,
2498                           runtime_visible_type_annotations_length,
2499                           runtime_invisible_type_annotations,
2500                           runtime_invisible_type_annotations_length,
2501                           annotation_default,
2502                           annotation_default_length,
2503                           CHECK_NULL);
2504 
2505   if (name == vmSymbols::finalize_method_name() &&
2506       signature == vmSymbols::void_method_signature()) {
2507     if (m->is_empty_method()) {
2508       _has_empty_finalizer = true;
2509     } else {
2510       _has_finalizer = true;
2511     }
2512   }
2513   if (name == vmSymbols::object_initializer_name() &&
2514       signature == vmSymbols::void_method_signature() &&
2515       m->is_vanilla_constructor()) {
2516     _has_vanilla_constructor = true;
2517   }
2518 
2519   NOT_PRODUCT(m->verify());
2520   return m;
2521 }
2522 
2523 
2524 // The promoted_flags parameter is used to pass relevant access_flags
2525 // from the methods back up to the containing klass. These flag values
2526 // are added to klass's access_flags.
2527 
2528 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2529                                                AccessFlags* promoted_flags,
2530                                                bool* has_final_method,
2531                                                bool* declares_default_methods,
2532                                                TRAPS) {
2533   ClassFileStream* cfs = stream();
2534   cfs->guarantee_more(2, CHECK_NULL);  // length
2535   u2 length = cfs->get_u2_fast();
2536   if (length == 0) {
2537     _methods = Universe::the_empty_method_array();
2538   } else {
2539     _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2540 
2541     HandleMark hm(THREAD);
2542     for (int index = 0; index < length; index++) {
2543       methodHandle method = parse_method(is_interface,
2544                                          promoted_flags,
2545                                          CHECK_NULL);
2546 
2547       if (method->is_final()) {
2548         *has_final_method = true;
2549       }
2550       // declares_default_methods: declares concrete instance methods, any access flags
2551       // used for interface initialization, and default method inheritance analysis
2552       if (is_interface && !(*declares_default_methods)
2553         && !method->is_abstract() && !method->is_static()) {
2554         *declares_default_methods = true;
2555       }
2556       _methods->at_put(index, method());
2557     }
2558 
2559     if (_need_verify && length > 1) {
2560       // Check duplicated methods
2561       ResourceMark rm(THREAD);
2562       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2563         THREAD, NameSigHash*, HASH_ROW_SIZE);
2564       initialize_hashtable(names_and_sigs);
2565       bool dup = false;
2566       {
2567         debug_only(No_Safepoint_Verifier nsv;)
2568         for (int i = 0; i < length; i++) {
2569           Method* m = _methods->at(i);
2570           // If no duplicates, add name/signature in hashtable names_and_sigs.
2571           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2572             dup = true;
2573             break;
2574           }
2575         }
2576       }
2577       if (dup) {
2578         classfile_parse_error("Duplicate method name&signature in class file %s",
2579                               CHECK_NULL);
2580       }
2581     }
2582   }
2583   return _methods;
2584 }
2585 
2586 
2587 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2588   int length = methods->length();
2589   // If JVMTI original method ordering or sharing is enabled we have to
2590   // remember the original class file ordering.
2591   // We temporarily use the vtable_index field in the Method* to store the
2592   // class file index, so we can read in after calling qsort.
2593   // Put the method ordering in the shared archive.
2594   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2595     for (int index = 0; index < length; index++) {
2596       Method* m = methods->at(index);
2597       assert(!m->valid_vtable_index(), "vtable index should not be set");
2598       m->set_vtable_index(index);
2599     }
2600   }
2601   // Sort method array by ascending method name (for faster lookups & vtable construction)
2602   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2603   Method::sort_methods(methods);
2604 
2605   intArray* method_ordering = NULL;
2606   // If JVMTI original method ordering or sharing is enabled construct int
2607   // array remembering the original ordering
2608   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2609     method_ordering = new intArray(length);
2610     for (int index = 0; index < length; index++) {
2611       Method* m = methods->at(index);
2612       int old_index = m->vtable_index();
2613       assert(old_index >= 0 && old_index < length, "invalid method index");
2614       method_ordering->at_put(index, old_index);
2615       m->set_vtable_index(Method::invalid_vtable_index);
2616     }
2617   }
2618   return method_ordering;
2619 }
2620 
2621 // Parse generic_signature attribute for methods and fields
2622 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2623   ClassFileStream* cfs = stream();
2624   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2625   u2 generic_signature_index = cfs->get_u2_fast();
2626   check_property(
2627     valid_symbol_at(generic_signature_index),
2628     "Invalid Signature attribute at constant pool index %u in class file %s",
2629     generic_signature_index, CHECK_0);
2630   return generic_signature_index;
2631 }
2632 
2633 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2634   ClassFileStream* cfs = stream();
2635   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2636   u2 sourcefile_index = cfs->get_u2_fast();
2637   check_property(
2638     valid_symbol_at(sourcefile_index),
2639     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2640     sourcefile_index, CHECK);
2641   set_class_sourcefile_index(sourcefile_index);
2642 }
2643 
2644 
2645 
2646 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2647   ClassFileStream* cfs = stream();
2648   u1* sde_buffer = cfs->get_u1_buffer();
2649   assert(sde_buffer != NULL, "null sde buffer");
2650 
2651   // Don't bother storing it if there is no way to retrieve it
2652   if (JvmtiExport::can_get_source_debug_extension()) {
2653     assert((length+1) > length, "Overflow checking");
2654     u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2655     for (int i = 0; i < length; i++) {
2656       sde[i] = sde_buffer[i];
2657     }
2658     sde[length] = '\0';
2659     set_class_sde_buffer((char*)sde, length);
2660   }
2661   // Got utf8 string, set stream position forward
2662   cfs->skip_u1(length, CHECK);
2663 }
2664 
2665 
2666 // Inner classes can be static, private or protected (classic VM does this)
2667 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2668 
2669 // Return number of classes in the inner classes attribute table
2670 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2671                                                             bool parsed_enclosingmethod_attribute,
2672                                                             u2 enclosing_method_class_index,
2673                                                             u2 enclosing_method_method_index,
2674                                                             TRAPS) {
2675   ClassFileStream* cfs = stream();
2676   u1* current_mark = cfs->current();
2677   u2 length = 0;
2678   if (inner_classes_attribute_start != NULL) {
2679     cfs->set_current(inner_classes_attribute_start);
2680     cfs->guarantee_more(2, CHECK_0);  // length
2681     length = cfs->get_u2_fast();
2682   }
2683 
2684   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2685   // method data:
2686   //   [inner_class_info_index,
2687   //    outer_class_info_index,
2688   //    inner_name_index,
2689   //    inner_class_access_flags,
2690   //    ...
2691   //    enclosing_method_class_index,
2692   //    enclosing_method_method_index]
2693   int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2694   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2695   _inner_classes = inner_classes;
2696 
2697   int index = 0;
2698   int cp_size = _cp->length();
2699   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
2700   for (int n = 0; n < length; n++) {
2701     // Inner class index
2702     u2 inner_class_info_index = cfs->get_u2_fast();
2703     check_property(
2704       valid_klass_reference_at(inner_class_info_index),
2705       "inner_class_info_index %u has bad constant type in class file %s",
2706       inner_class_info_index, CHECK_0);
2707     // Outer class index
2708     u2 outer_class_info_index = cfs->get_u2_fast();
2709     check_property(
2710       outer_class_info_index == 0 ||
2711         valid_klass_reference_at(outer_class_info_index),
2712       "outer_class_info_index %u has bad constant type in class file %s",
2713       outer_class_info_index, CHECK_0);
2714     // Inner class name
2715     u2 inner_name_index = cfs->get_u2_fast();
2716     check_property(
2717       inner_name_index == 0 || valid_symbol_at(inner_name_index),
2718       "inner_name_index %u has bad constant type in class file %s",
2719       inner_name_index, CHECK_0);
2720     if (_need_verify) {
2721       guarantee_property(inner_class_info_index != outer_class_info_index,
2722                          "Class is both outer and inner class in class file %s", CHECK_0);
2723     }
2724     // Access flags
2725     AccessFlags inner_access_flags;
2726     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2727     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2728       // Set abstract bit for old class files for backward compatibility
2729       flags |= JVM_ACC_ABSTRACT;
2730     }
2731     verify_legal_class_modifiers(flags, CHECK_0);
2732     inner_access_flags.set_flags(flags);
2733 
2734     inner_classes->at_put(index++, inner_class_info_index);
2735     inner_classes->at_put(index++, outer_class_info_index);
2736     inner_classes->at_put(index++, inner_name_index);
2737     inner_classes->at_put(index++, inner_access_flags.as_short());
2738   }
2739 
2740   // 4347400: make sure there's no duplicate entry in the classes array
2741   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2742     for(int i = 0; i < length * 4; i += 4) {
2743       for(int j = i + 4; j < length * 4; j += 4) {
2744         guarantee_property((inner_classes->at(i)   != inner_classes->at(j) ||
2745                             inner_classes->at(i+1) != inner_classes->at(j+1) ||
2746                             inner_classes->at(i+2) != inner_classes->at(j+2) ||
2747                             inner_classes->at(i+3) != inner_classes->at(j+3)),
2748                             "Duplicate entry in InnerClasses in class file %s",
2749                             CHECK_0);
2750       }
2751     }
2752   }
2753 
2754   // Set EnclosingMethod class and method indexes.
2755   if (parsed_enclosingmethod_attribute) {
2756     inner_classes->at_put(index++, enclosing_method_class_index);
2757     inner_classes->at_put(index++, enclosing_method_method_index);
2758   }
2759   assert(index == size, "wrong size");
2760 
2761   // Restore buffer's current position.
2762   cfs->set_current(current_mark);
2763 
2764   return length;
2765 }
2766 
2767 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2768   set_class_synthetic_flag(true);
2769 }
2770 
2771 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2772   ClassFileStream* cfs = stream();
2773   u2 signature_index = cfs->get_u2(CHECK);
2774   check_property(
2775     valid_symbol_at(signature_index),
2776     "Invalid constant pool index %u in Signature attribute in class file %s",
2777     signature_index, CHECK);
2778   set_class_generic_signature_index(signature_index);
2779 }
2780 
2781 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2782   ClassFileStream* cfs = stream();
2783   u1* current_start = cfs->current();
2784 
2785   guarantee_property(attribute_byte_length >= sizeof(u2),
2786                      "Invalid BootstrapMethods attribute length %u in class file %s",
2787                      attribute_byte_length,
2788                      CHECK);
2789 
2790   cfs->guarantee_more(attribute_byte_length, CHECK);
2791 
2792   int attribute_array_length = cfs->get_u2_fast();
2793 
2794   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2795                      "Short length on BootstrapMethods in class file %s",
2796                      CHECK);
2797 
2798 
2799   // The attribute contains a counted array of counted tuples of shorts,
2800   // represending bootstrap specifiers:
2801   //    length*{bootstrap_method_index, argument_count*{argument_index}}
2802   int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2803   // operand_count = number of shorts in attr, except for leading length
2804 
2805   // The attribute is copied into a short[] array.
2806   // The array begins with a series of short[2] pairs, one for each tuple.
2807   int index_size = (attribute_array_length * 2);
2808 
2809   Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2810 
2811   // Eagerly assign operands so they will be deallocated with the constant
2812   // pool if there is an error.
2813   _cp->set_operands(operands);
2814 
2815   int operand_fill_index = index_size;
2816   int cp_size = _cp->length();
2817 
2818   for (int n = 0; n < attribute_array_length; n++) {
2819     // Store a 32-bit offset into the header of the operand array.
2820     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2821 
2822     // Read a bootstrap specifier.
2823     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
2824     u2 bootstrap_method_index = cfs->get_u2_fast();
2825     u2 argument_count = cfs->get_u2_fast();
2826     check_property(
2827       valid_cp_range(bootstrap_method_index, cp_size) &&
2828       _cp->tag_at(bootstrap_method_index).is_method_handle(),
2829       "bootstrap_method_index %u has bad constant type in class file %s",
2830       bootstrap_method_index,
2831       CHECK);
2832 
2833     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2834       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2835       CHECK);
2836 
2837     operands->at_put(operand_fill_index++, bootstrap_method_index);
2838     operands->at_put(operand_fill_index++, argument_count);
2839 
2840     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
2841     for (int j = 0; j < argument_count; j++) {
2842       u2 argument_index = cfs->get_u2_fast();
2843       check_property(
2844         valid_cp_range(argument_index, cp_size) &&
2845         _cp->tag_at(argument_index).is_loadable_constant(),
2846         "argument_index %u has bad constant type in class file %s",
2847         argument_index,
2848         CHECK);
2849       operands->at_put(operand_fill_index++, argument_index);
2850     }
2851   }
2852 
2853   u1* current_end = cfs->current();
2854   guarantee_property(current_end == current_start + attribute_byte_length,
2855                      "Bad length on BootstrapMethods in class file %s",
2856                      CHECK);
2857 }
2858 
2859 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2860                                                  TRAPS) {
2861   ClassFileStream* cfs = stream();
2862   // Set inner classes attribute to default sentinel
2863   _inner_classes = Universe::the_empty_short_array();
2864   cfs->guarantee_more(2, CHECK);  // attributes_count
2865   u2 attributes_count = cfs->get_u2_fast();
2866   bool parsed_sourcefile_attribute = false;
2867   bool parsed_innerclasses_attribute = false;
2868   bool parsed_enclosingmethod_attribute = false;
2869   bool parsed_bootstrap_methods_attribute = false;
2870   u1* runtime_visible_annotations = NULL;
2871   int runtime_visible_annotations_length = 0;
2872   u1* runtime_invisible_annotations = NULL;
2873   int runtime_invisible_annotations_length = 0;
2874   u1* runtime_visible_type_annotations = NULL;
2875   int runtime_visible_type_annotations_length = 0;
2876   u1* runtime_invisible_type_annotations = NULL;
2877   int runtime_invisible_type_annotations_length = 0;
2878   bool runtime_invisible_type_annotations_exists = false;
2879   bool runtime_invisible_annotations_exists = false;
2880   bool parsed_source_debug_ext_annotations_exist = false;
2881   u1* inner_classes_attribute_start = NULL;
2882   u4  inner_classes_attribute_length = 0;
2883   u2  enclosing_method_class_index = 0;
2884   u2  enclosing_method_method_index = 0;
2885   // Iterate over attributes
2886   while (attributes_count--) {
2887     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
2888     u2 attribute_name_index = cfs->get_u2_fast();
2889     u4 attribute_length = cfs->get_u4_fast();
2890     check_property(
2891       valid_symbol_at(attribute_name_index),
2892       "Attribute name has bad constant pool index %u in class file %s",
2893       attribute_name_index, CHECK);
2894     Symbol* tag = _cp->symbol_at(attribute_name_index);
2895     if (tag == vmSymbols::tag_source_file()) {
2896       // Check for SourceFile tag
2897       if (_need_verify) {
2898         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2899       }
2900       if (parsed_sourcefile_attribute) {
2901         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2902       } else {
2903         parsed_sourcefile_attribute = true;
2904       }
2905       parse_classfile_sourcefile_attribute(CHECK);
2906     } else if (tag == vmSymbols::tag_source_debug_extension()) {
2907       // Check for SourceDebugExtension tag
2908       if (parsed_source_debug_ext_annotations_exist) {
2909           classfile_parse_error(
2910             "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2911       }
2912       parsed_source_debug_ext_annotations_exist = true;
2913       parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2914     } else if (tag == vmSymbols::tag_inner_classes()) {
2915       // Check for InnerClasses tag
2916       if (parsed_innerclasses_attribute) {
2917         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2918       } else {
2919         parsed_innerclasses_attribute = true;
2920       }
2921       inner_classes_attribute_start = cfs->get_u1_buffer();
2922       inner_classes_attribute_length = attribute_length;
2923       cfs->skip_u1(inner_classes_attribute_length, CHECK);
2924     } else if (tag == vmSymbols::tag_synthetic()) {
2925       // Check for Synthetic tag
2926       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2927       if (attribute_length != 0) {
2928         classfile_parse_error(
2929           "Invalid Synthetic classfile attribute length %u in class file %s",
2930           attribute_length, CHECK);
2931       }
2932       parse_classfile_synthetic_attribute(CHECK);
2933     } else if (tag == vmSymbols::tag_deprecated()) {
2934       // Check for Deprecatd tag - 4276120
2935       if (attribute_length != 0) {
2936         classfile_parse_error(
2937           "Invalid Deprecated classfile attribute length %u in class file %s",
2938           attribute_length, CHECK);
2939       }
2940     } else if (_major_version >= JAVA_1_5_VERSION) {
2941       if (tag == vmSymbols::tag_signature()) {
2942         if (attribute_length != 2) {
2943           classfile_parse_error(
2944             "Wrong Signature attribute length %u in class file %s",
2945             attribute_length, CHECK);
2946         }
2947         parse_classfile_signature_attribute(CHECK);
2948       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2949         if (runtime_visible_annotations != NULL) {
2950           classfile_parse_error(
2951             "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2952         }
2953         runtime_visible_annotations_length = attribute_length;
2954         runtime_visible_annotations = cfs->get_u1_buffer();
2955         assert(runtime_visible_annotations != NULL, "null visible annotations");
2956         parse_annotations(runtime_visible_annotations,
2957                           runtime_visible_annotations_length,
2958                           parsed_annotations);
2959         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2960       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2961         if (runtime_invisible_annotations_exists) {
2962           classfile_parse_error(
2963             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2964         }
2965         runtime_invisible_annotations_exists = true;
2966         if (PreserveAllAnnotations) {
2967           runtime_invisible_annotations_length = attribute_length;
2968           runtime_invisible_annotations = cfs->get_u1_buffer();
2969           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2970         }
2971         cfs->skip_u1(attribute_length, CHECK);
2972       } else if (tag == vmSymbols::tag_enclosing_method()) {
2973         if (parsed_enclosingmethod_attribute) {
2974           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2975         } else {
2976           parsed_enclosingmethod_attribute = true;
2977         }
2978         guarantee_property(attribute_length == 4,
2979           "Wrong EnclosingMethod attribute length %u in class file %s",
2980           attribute_length, CHECK);
2981         cfs->guarantee_more(4, CHECK);  // class_index, method_index
2982         enclosing_method_class_index  = cfs->get_u2_fast();
2983         enclosing_method_method_index = cfs->get_u2_fast();
2984         if (enclosing_method_class_index == 0) {
2985           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2986         }
2987         // Validate the constant pool indices and types
2988         check_property(valid_klass_reference_at(enclosing_method_class_index),
2989           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2990         if (enclosing_method_method_index != 0 &&
2991             (!_cp->is_within_bounds(enclosing_method_method_index) ||
2992              !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2993           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2994         }
2995       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2996                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2997         if (parsed_bootstrap_methods_attribute)
2998           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2999         parsed_bootstrap_methods_attribute = true;
3000         parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3001       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3002         if (runtime_visible_type_annotations != NULL) {
3003           classfile_parse_error(
3004             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3005         }
3006         runtime_visible_type_annotations_length = attribute_length;
3007         runtime_visible_type_annotations = cfs->get_u1_buffer();
3008         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3009         // No need for the VM to parse Type annotations
3010         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3011       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3012         if (runtime_invisible_type_annotations_exists) {
3013           classfile_parse_error(
3014             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3015         } else {
3016           runtime_invisible_type_annotations_exists = true;
3017         }
3018         if (PreserveAllAnnotations) {
3019           runtime_invisible_type_annotations_length = attribute_length;
3020           runtime_invisible_type_annotations = cfs->get_u1_buffer();
3021           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3022         }
3023         cfs->skip_u1(attribute_length, CHECK);
3024       } else {
3025         // Unknown attribute
3026         cfs->skip_u1(attribute_length, CHECK);
3027       }
3028     } else {
3029       // Unknown attribute
3030       cfs->skip_u1(attribute_length, CHECK);
3031     }
3032   }
3033   _annotations = assemble_annotations(runtime_visible_annotations,
3034                                       runtime_visible_annotations_length,
3035                                       runtime_invisible_annotations,
3036                                       runtime_invisible_annotations_length,
3037                                       CHECK);
3038   _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3039                                            runtime_visible_type_annotations_length,
3040                                            runtime_invisible_type_annotations,
3041                                            runtime_invisible_type_annotations_length,
3042                                            CHECK);
3043 
3044   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3045     u2 num_of_classes = parse_classfile_inner_classes_attribute(
3046                             inner_classes_attribute_start,
3047                             parsed_innerclasses_attribute,
3048                             enclosing_method_class_index,
3049                             enclosing_method_method_index,
3050                             CHECK);
3051     if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3052       guarantee_property(
3053         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3054         "Wrong InnerClasses attribute length in class file %s", CHECK);
3055     }
3056   }
3057 
3058   if (_max_bootstrap_specifier_index >= 0) {
3059     guarantee_property(parsed_bootstrap_methods_attribute,
3060                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3061   }
3062 }
3063 
3064 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3065   if (_synthetic_flag)
3066     k->set_is_synthetic();
3067   if (_sourcefile_index != 0) {
3068     k->set_source_file_name_index(_sourcefile_index);
3069   }
3070   if (_generic_signature_index != 0) {
3071     k->set_generic_signature_index(_generic_signature_index);
3072   }
3073   if (_sde_buffer != NULL) {
3074     k->set_source_debug_extension(_sde_buffer, _sde_length);
3075   }
3076 }
3077 
3078 // Create the Annotations object that will
3079 // hold the annotations array for the Klass.
3080 void ClassFileParser::create_combined_annotations(TRAPS) {
3081     if (_annotations == NULL &&
3082         _type_annotations == NULL &&
3083         _fields_annotations == NULL &&
3084         _fields_type_annotations == NULL) {
3085       // Don't create the Annotations object unnecessarily.
3086       return;
3087     }
3088 
3089     Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3090     annotations->set_class_annotations(_annotations);
3091     annotations->set_class_type_annotations(_type_annotations);
3092     annotations->set_fields_annotations(_fields_annotations);
3093     annotations->set_fields_type_annotations(_fields_type_annotations);
3094 
3095     // This is the Annotations object that will be
3096     // assigned to InstanceKlass being constructed.
3097     _combined_annotations = annotations;
3098 
3099     // The annotations arrays below has been transfered the
3100     // _combined_annotations so these fields can now be cleared.
3101     _annotations             = NULL;
3102     _type_annotations        = NULL;
3103     _fields_annotations      = NULL;
3104     _fields_type_annotations = NULL;
3105 }
3106 
3107 // Transfer ownership of metadata allocated to the InstanceKlass.
3108 void ClassFileParser::apply_parsed_class_metadata(
3109                                             instanceKlassHandle this_klass,
3110                                             int java_fields_count, TRAPS) {
3111   _cp->set_pool_holder(this_klass());
3112   this_klass->set_constants(_cp);
3113   this_klass->set_fields(_fields, java_fields_count);
3114   this_klass->set_methods(_methods);
3115   this_klass->set_inner_classes(_inner_classes);
3116   this_klass->set_local_interfaces(_local_interfaces);
3117   this_klass->set_transitive_interfaces(_transitive_interfaces);
3118   this_klass->set_annotations(_combined_annotations);
3119 
3120   // Clear out these fields so they don't get deallocated by the destructor
3121   clear_class_metadata();
3122 }
3123 
3124 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3125                                                        int runtime_visible_annotations_length,
3126                                                        u1* runtime_invisible_annotations,
3127                                                        int runtime_invisible_annotations_length, TRAPS) {
3128   AnnotationArray* annotations = NULL;
3129   if (runtime_visible_annotations != NULL ||
3130       runtime_invisible_annotations != NULL) {
3131     annotations = MetadataFactory::new_array<u1>(_loader_data,
3132                                           runtime_visible_annotations_length +
3133                                           runtime_invisible_annotations_length,
3134                                           CHECK_(annotations));
3135     if (runtime_visible_annotations != NULL) {
3136       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3137         annotations->at_put(i, runtime_visible_annotations[i]);
3138       }
3139     }
3140     if (runtime_invisible_annotations != NULL) {
3141       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3142         int append = runtime_visible_annotations_length+i;
3143         annotations->at_put(append, runtime_invisible_annotations[i]);
3144       }
3145     }
3146   }
3147   return annotations;
3148 }
3149 
3150 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3151                                                        TRAPS) {
3152   instanceKlassHandle super_klass;
3153   if (super_class_index == 0) {
3154     check_property(_class_name == vmSymbols::java_lang_Object(),
3155                    "Invalid superclass index %u in class file %s",
3156                    super_class_index,
3157                    CHECK_NULL);
3158   } else {
3159     check_property(valid_klass_reference_at(super_class_index),
3160                    "Invalid superclass index %u in class file %s",
3161                    super_class_index,
3162                    CHECK_NULL);
3163     // The class name should be legal because it is checked when parsing constant pool.
3164     // However, make sure it is not an array type.
3165     bool is_array = false;
3166     if (_cp->tag_at(super_class_index).is_klass()) {
3167       super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3168       if (_need_verify)
3169         is_array = super_klass->oop_is_array();
3170     } else if (_need_verify) {
3171       is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3172     }
3173     if (_need_verify) {
3174       guarantee_property(!is_array,
3175                         "Bad superclass name in class file %s", CHECK_NULL);
3176     }
3177   }
3178   return super_klass;
3179 }
3180 
3181 
3182 // Values needed for oopmap and InstanceKlass creation
3183 class FieldLayoutInfo : public StackObj {
3184  public:
3185   int*          nonstatic_oop_offsets;
3186   unsigned int* nonstatic_oop_counts;
3187   unsigned int  nonstatic_oop_map_count;
3188   unsigned int  total_oop_map_count;
3189   int           instance_size;
3190   int           nonstatic_field_size;
3191   int           static_field_size;
3192   bool          has_nonstatic_fields;
3193 };
3194 
3195 // Layout fields and fill in FieldLayoutInfo.  Could use more refactoring!
3196 void ClassFileParser::layout_fields(Handle class_loader,
3197                                     FieldAllocationCount* fac,
3198                                     ClassAnnotationCollector* parsed_annotations,
3199                                     FieldLayoutInfo* info,
3200                                     TRAPS) {
3201 
3202   // Field size and offset computation
3203   int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3204   int next_static_oop_offset;
3205   int next_static_double_offset;
3206   int next_static_word_offset;
3207   int next_static_short_offset;
3208   int next_static_byte_offset;
3209   int next_nonstatic_oop_offset;
3210   int next_nonstatic_double_offset;
3211   int next_nonstatic_word_offset;
3212   int next_nonstatic_short_offset;
3213   int next_nonstatic_byte_offset;
3214   int first_nonstatic_oop_offset;
3215   int next_nonstatic_field_offset;
3216   int next_nonstatic_padded_offset;
3217 
3218   // Count the contended fields by type.
3219   //
3220   // We ignore static fields, because @Contended is not supported for them.
3221   // The layout code below will also ignore the static fields.
3222   int nonstatic_contended_count = 0;
3223   FieldAllocationCount fac_contended;
3224   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3225     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3226     if (fs.is_contended()) {
3227       fac_contended.count[atype]++;
3228       if (!fs.access_flags().is_static()) {
3229         nonstatic_contended_count++;
3230       }
3231     }
3232   }
3233 
3234 
3235   // Calculate the starting byte offsets
3236   next_static_oop_offset      = InstanceMirrorKlass::offset_of_static_fields();
3237   next_static_double_offset   = next_static_oop_offset +
3238                                 ((fac->count[STATIC_OOP]) * heapOopSize);
3239   if ( fac->count[STATIC_DOUBLE] &&
3240        (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3241         Universe::field_type_should_be_aligned(T_LONG)) ) {
3242     next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3243   }
3244 
3245   next_static_word_offset     = next_static_double_offset +
3246                                 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3247   next_static_short_offset    = next_static_word_offset +
3248                                 ((fac->count[STATIC_WORD]) * BytesPerInt);
3249   next_static_byte_offset     = next_static_short_offset +
3250                                 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3251 
3252   int nonstatic_fields_start  = instanceOopDesc::base_offset_in_bytes() +
3253                                 nonstatic_field_size * heapOopSize;
3254 
3255   next_nonstatic_field_offset = nonstatic_fields_start;
3256 
3257   bool is_contended_class     = parsed_annotations->is_contended();
3258 
3259   // Class is contended, pad before all the fields
3260   if (is_contended_class) {
3261     next_nonstatic_field_offset += ContendedPaddingWidth;
3262   }
3263 
3264   // Compute the non-contended fields count.
3265   // The packing code below relies on these counts to determine if some field
3266   // can be squeezed into the alignment gap. Contended fields are obviously
3267   // exempt from that.
3268   unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3269   unsigned int nonstatic_word_count   = fac->count[NONSTATIC_WORD]   - fac_contended.count[NONSTATIC_WORD];
3270   unsigned int nonstatic_short_count  = fac->count[NONSTATIC_SHORT]  - fac_contended.count[NONSTATIC_SHORT];
3271   unsigned int nonstatic_byte_count   = fac->count[NONSTATIC_BYTE]   - fac_contended.count[NONSTATIC_BYTE];
3272   unsigned int nonstatic_oop_count    = fac->count[NONSTATIC_OOP]    - fac_contended.count[NONSTATIC_OOP];
3273 
3274   // Total non-static fields count, including every contended field
3275   unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3276                                         fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3277                                         fac->count[NONSTATIC_OOP];
3278 
3279   bool super_has_nonstatic_fields =
3280           (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3281   bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3282 
3283 
3284   // Prepare list of oops for oop map generation.
3285   //
3286   // "offset" and "count" lists are describing the set of contiguous oop
3287   // regions. offset[i] is the start of the i-th region, which then has
3288   // count[i] oops following. Before we know how many regions are required,
3289   // we pessimistically allocate the maps to fit all the oops into the
3290   // distinct regions.
3291   //
3292   // TODO: We add +1 to always allocate non-zero resource arrays; we need
3293   // to figure out if we still need to do this.
3294   int* nonstatic_oop_offsets;
3295   unsigned int* nonstatic_oop_counts;
3296   unsigned int nonstatic_oop_map_count = 0;
3297   unsigned int max_nonstatic_oop_maps  = fac->count[NONSTATIC_OOP] + 1;
3298 
3299   nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3300             THREAD, int, max_nonstatic_oop_maps);
3301   nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
3302             THREAD, unsigned int, max_nonstatic_oop_maps);
3303 
3304   first_nonstatic_oop_offset = 0; // will be set for first oop field
3305 
3306   bool compact_fields   = CompactFields;
3307   int  allocation_style = FieldsAllocationStyle;
3308   if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3309     assert(false, "0 <= FieldsAllocationStyle <= 2");
3310     allocation_style = 1; // Optimistic
3311   }
3312 
3313   // The next classes have predefined hard-coded fields offsets
3314   // (see in JavaClasses::compute_hard_coded_offsets()).
3315   // Use default fields allocation order for them.
3316   if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3317       (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3318        _class_name == vmSymbols::java_lang_Class() ||
3319        _class_name == vmSymbols::java_lang_ClassLoader() ||
3320        _class_name == vmSymbols::java_lang_ref_Reference() ||
3321        _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3322        _class_name == vmSymbols::java_lang_StackTraceElement() ||
3323        _class_name == vmSymbols::java_lang_String() ||
3324        _class_name == vmSymbols::java_lang_Throwable() ||
3325        _class_name == vmSymbols::java_lang_Boolean() ||
3326        _class_name == vmSymbols::java_lang_Character() ||
3327        _class_name == vmSymbols::java_lang_Float() ||
3328        _class_name == vmSymbols::java_lang_Double() ||
3329        _class_name == vmSymbols::java_lang_Byte() ||
3330        _class_name == vmSymbols::java_lang_Short() ||
3331        _class_name == vmSymbols::java_lang_Integer() ||
3332        _class_name == vmSymbols::java_lang_Long())) {
3333     allocation_style = 0;     // Allocate oops first
3334     compact_fields   = false; // Don't compact fields
3335   }
3336 
3337   // Rearrange fields for a given allocation style
3338   if( allocation_style == 0 ) {
3339     // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3340     next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3341     next_nonstatic_double_offset = next_nonstatic_oop_offset +
3342                                     (nonstatic_oop_count * heapOopSize);
3343   } else if( allocation_style == 1 ) {
3344     // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3345     next_nonstatic_double_offset = next_nonstatic_field_offset;
3346   } else if( allocation_style == 2 ) {
3347     // Fields allocation: oops fields in super and sub classes are together.
3348     if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3349         _super_klass->nonstatic_oop_map_size() > 0 ) {
3350       unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3351       OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3352       OopMapBlock* last_map = first_map + map_count - 1;
3353       int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3354       if (next_offset == next_nonstatic_field_offset) {
3355         allocation_style = 0;   // allocate oops first
3356         next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3357         next_nonstatic_double_offset = next_nonstatic_oop_offset +
3358                                        (nonstatic_oop_count * heapOopSize);
3359       }
3360     }
3361     if( allocation_style == 2 ) {
3362       allocation_style = 1;     // allocate oops last
3363       next_nonstatic_double_offset = next_nonstatic_field_offset;
3364     }
3365   } else {
3366     ShouldNotReachHere();
3367   }
3368 
3369   int nonstatic_oop_space_count   = 0;
3370   int nonstatic_word_space_count  = 0;
3371   int nonstatic_short_space_count = 0;
3372   int nonstatic_byte_space_count  = 0;
3373   int nonstatic_oop_space_offset;
3374   int nonstatic_word_space_offset;
3375   int nonstatic_short_space_offset;
3376   int nonstatic_byte_space_offset;
3377 
3378   // Try to squeeze some of the fields into the gaps due to
3379   // long/double alignment.
3380   if( nonstatic_double_count > 0 ) {
3381     int offset = next_nonstatic_double_offset;
3382     next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3383     if( compact_fields && offset != next_nonstatic_double_offset ) {
3384       // Allocate available fields into the gap before double field.
3385       int length = next_nonstatic_double_offset - offset;
3386       assert(length == BytesPerInt, "");
3387       nonstatic_word_space_offset = offset;
3388       if( nonstatic_word_count > 0 ) {
3389         nonstatic_word_count      -= 1;
3390         nonstatic_word_space_count = 1; // Only one will fit
3391         length -= BytesPerInt;
3392         offset += BytesPerInt;
3393       }
3394       nonstatic_short_space_offset = offset;
3395       while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3396         nonstatic_short_count       -= 1;
3397         nonstatic_short_space_count += 1;
3398         length -= BytesPerShort;
3399         offset += BytesPerShort;
3400       }
3401       nonstatic_byte_space_offset = offset;
3402       while( length > 0 && nonstatic_byte_count > 0 ) {
3403         nonstatic_byte_count       -= 1;
3404         nonstatic_byte_space_count += 1;
3405         length -= 1;
3406       }
3407       // Allocate oop field in the gap if there are no other fields for that.
3408       nonstatic_oop_space_offset = offset;
3409       if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3410           allocation_style != 0 ) { // when oop fields not first
3411         nonstatic_oop_count      -= 1;
3412         nonstatic_oop_space_count = 1; // Only one will fit
3413         length -= heapOopSize;
3414         offset += heapOopSize;
3415       }
3416     }
3417   }
3418 
3419   next_nonstatic_word_offset  = next_nonstatic_double_offset +
3420                                 (nonstatic_double_count * BytesPerLong);
3421   next_nonstatic_short_offset = next_nonstatic_word_offset +
3422                                 (nonstatic_word_count * BytesPerInt);
3423   next_nonstatic_byte_offset  = next_nonstatic_short_offset +
3424                                 (nonstatic_short_count * BytesPerShort);
3425   next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3426                                 nonstatic_byte_count;
3427 
3428   // let oops jump before padding with this allocation style
3429   if( allocation_style == 1 ) {
3430     next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3431     if( nonstatic_oop_count > 0 ) {
3432       next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3433     }
3434     next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3435   }
3436 
3437   // Iterate over fields again and compute correct offsets.
3438   // The field allocation type was temporarily stored in the offset slot.
3439   // oop fields are located before non-oop fields (static and non-static).
3440   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3441 
3442     // skip already laid out fields
3443     if (fs.is_offset_set()) continue;
3444 
3445     // contended instance fields are handled below
3446     if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3447 
3448     int real_offset;
3449     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3450 
3451     // pack the rest of the fields
3452     switch (atype) {
3453       case STATIC_OOP:
3454         real_offset = next_static_oop_offset;
3455         next_static_oop_offset += heapOopSize;
3456         break;
3457       case STATIC_BYTE:
3458         real_offset = next_static_byte_offset;
3459         next_static_byte_offset += 1;
3460         break;
3461       case STATIC_SHORT:
3462         real_offset = next_static_short_offset;
3463         next_static_short_offset += BytesPerShort;
3464         break;
3465       case STATIC_WORD:
3466         real_offset = next_static_word_offset;
3467         next_static_word_offset += BytesPerInt;
3468         break;
3469       case STATIC_DOUBLE:
3470         real_offset = next_static_double_offset;
3471         next_static_double_offset += BytesPerLong;
3472         break;
3473       case NONSTATIC_OOP:
3474         if( nonstatic_oop_space_count > 0 ) {
3475           real_offset = nonstatic_oop_space_offset;
3476           nonstatic_oop_space_offset += heapOopSize;
3477           nonstatic_oop_space_count  -= 1;
3478         } else {
3479           real_offset = next_nonstatic_oop_offset;
3480           next_nonstatic_oop_offset += heapOopSize;
3481         }
3482 
3483         // Record this oop in the oop maps
3484         if( nonstatic_oop_map_count > 0 &&
3485             nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3486             real_offset -
3487             int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3488             heapOopSize ) {
3489           // This oop is adjacent to the previous one, add to current oop map
3490           assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3491           nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3492         } else {
3493           // This oop is not adjacent to the previous one, create new oop map
3494           assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3495           nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3496           nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3497           nonstatic_oop_map_count += 1;
3498           if( first_nonstatic_oop_offset == 0 ) { // Undefined
3499             first_nonstatic_oop_offset = real_offset;
3500           }
3501         }
3502         break;
3503       case NONSTATIC_BYTE:
3504         if( nonstatic_byte_space_count > 0 ) {
3505           real_offset = nonstatic_byte_space_offset;
3506           nonstatic_byte_space_offset += 1;
3507           nonstatic_byte_space_count  -= 1;
3508         } else {
3509           real_offset = next_nonstatic_byte_offset;
3510           next_nonstatic_byte_offset += 1;
3511         }
3512         break;
3513       case NONSTATIC_SHORT:
3514         if( nonstatic_short_space_count > 0 ) {
3515           real_offset = nonstatic_short_space_offset;
3516           nonstatic_short_space_offset += BytesPerShort;
3517           nonstatic_short_space_count  -= 1;
3518         } else {
3519           real_offset = next_nonstatic_short_offset;
3520           next_nonstatic_short_offset += BytesPerShort;
3521         }
3522         break;
3523       case NONSTATIC_WORD:
3524         if( nonstatic_word_space_count > 0 ) {
3525           real_offset = nonstatic_word_space_offset;
3526           nonstatic_word_space_offset += BytesPerInt;
3527           nonstatic_word_space_count  -= 1;
3528         } else {
3529           real_offset = next_nonstatic_word_offset;
3530           next_nonstatic_word_offset += BytesPerInt;
3531         }
3532         break;
3533       case NONSTATIC_DOUBLE:
3534         real_offset = next_nonstatic_double_offset;
3535         next_nonstatic_double_offset += BytesPerLong;
3536         break;
3537       default:
3538         ShouldNotReachHere();
3539     }
3540     fs.set_offset(real_offset);
3541   }
3542 
3543 
3544   // Handle the contended cases.
3545   //
3546   // Each contended field should not intersect the cache line with another contended field.
3547   // In the absence of alignment information, we end up with pessimistically separating
3548   // the fields with full-width padding.
3549   //
3550   // Additionally, this should not break alignment for the fields, so we round the alignment up
3551   // for each field.
3552   if (nonstatic_contended_count > 0) {
3553 
3554     // if there is at least one contended field, we need to have pre-padding for them
3555     next_nonstatic_padded_offset += ContendedPaddingWidth;
3556 
3557     // collect all contended groups
3558     BitMap bm(_cp->size());
3559     for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3560       // skip already laid out fields
3561       if (fs.is_offset_set()) continue;
3562 
3563       if (fs.is_contended()) {
3564         bm.set_bit(fs.contended_group());
3565       }
3566     }
3567 
3568     int current_group = -1;
3569     while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3570 
3571       for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3572 
3573         // skip already laid out fields
3574         if (fs.is_offset_set()) continue;
3575 
3576         // skip non-contended fields and fields from different group
3577         if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3578 
3579         // handle statics below
3580         if (fs.access_flags().is_static()) continue;
3581 
3582         int real_offset;
3583         FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3584 
3585         switch (atype) {
3586           case NONSTATIC_BYTE:
3587             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3588             real_offset = next_nonstatic_padded_offset;
3589             next_nonstatic_padded_offset += 1;
3590             break;
3591 
3592           case NONSTATIC_SHORT:
3593             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3594             real_offset = next_nonstatic_padded_offset;
3595             next_nonstatic_padded_offset += BytesPerShort;
3596             break;
3597 
3598           case NONSTATIC_WORD:
3599             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3600             real_offset = next_nonstatic_padded_offset;
3601             next_nonstatic_padded_offset += BytesPerInt;
3602             break;
3603 
3604           case NONSTATIC_DOUBLE:
3605             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3606             real_offset = next_nonstatic_padded_offset;
3607             next_nonstatic_padded_offset += BytesPerLong;
3608             break;
3609 
3610           case NONSTATIC_OOP:
3611             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3612             real_offset = next_nonstatic_padded_offset;
3613             next_nonstatic_padded_offset += heapOopSize;
3614 
3615             // Record this oop in the oop maps
3616             if( nonstatic_oop_map_count > 0 &&
3617                 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3618                 real_offset -
3619                 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3620                 heapOopSize ) {
3621               // This oop is adjacent to the previous one, add to current oop map
3622               assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3623               nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3624             } else {
3625               // This oop is not adjacent to the previous one, create new oop map
3626               assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3627               nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3628               nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3629               nonstatic_oop_map_count += 1;
3630               if( first_nonstatic_oop_offset == 0 ) { // Undefined
3631                 first_nonstatic_oop_offset = real_offset;
3632               }
3633             }
3634             break;
3635 
3636           default:
3637             ShouldNotReachHere();
3638         }
3639 
3640         if (fs.contended_group() == 0) {
3641           // Contended group defines the equivalence class over the fields:
3642           // the fields within the same contended group are not inter-padded.
3643           // The only exception is default group, which does not incur the
3644           // equivalence, and so requires intra-padding.
3645           next_nonstatic_padded_offset += ContendedPaddingWidth;
3646         }
3647 
3648         fs.set_offset(real_offset);
3649       } // for
3650 
3651       // Start laying out the next group.
3652       // Note that this will effectively pad the last group in the back;
3653       // this is expected to alleviate memory contention effects for
3654       // subclass fields and/or adjacent object.
3655       // If this was the default group, the padding is already in place.
3656       if (current_group != 0) {
3657         next_nonstatic_padded_offset += ContendedPaddingWidth;
3658       }
3659     }
3660 
3661     // handle static fields
3662   }
3663 
3664   // Entire class is contended, pad in the back.
3665   // This helps to alleviate memory contention effects for subclass fields
3666   // and/or adjacent object.
3667   if (is_contended_class) {
3668     next_nonstatic_padded_offset += ContendedPaddingWidth;
3669   }
3670 
3671   int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3672 
3673   int nonstatic_fields_end      = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3674   int instance_end              = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3675   int static_fields_end         = align_size_up(next_static_byte_offset, wordSize);
3676 
3677   int static_field_size         = (static_fields_end -
3678                                    InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3679   nonstatic_field_size          = nonstatic_field_size +
3680                                   (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3681 
3682   int instance_size             = align_object_size(instance_end / wordSize);
3683 
3684   assert(instance_size == align_object_size(align_size_up(
3685          (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3686           wordSize) / wordSize), "consistent layout helper value");
3687 
3688   // Invariant: nonstatic_field end/start should only change if there are
3689   // nonstatic fields in the class, or if the class is contended. We compare
3690   // against the non-aligned value, so that end alignment will not fail the
3691   // assert without actually having the fields.
3692   assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3693          is_contended_class ||
3694          (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3695 
3696   // Number of non-static oop map blocks allocated at end of klass.
3697   const unsigned int total_oop_map_count =
3698     compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3699                           first_nonstatic_oop_offset);
3700 
3701 #ifndef PRODUCT
3702   if (PrintFieldLayout) {
3703     print_field_layout(_class_name,
3704           _fields,
3705           _cp,
3706           instance_size,
3707           nonstatic_fields_start,
3708           nonstatic_fields_end,
3709           static_fields_end);
3710   }
3711 
3712 #endif
3713   // Pass back information needed for InstanceKlass creation
3714   info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3715   info->nonstatic_oop_counts = nonstatic_oop_counts;
3716   info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3717   info->total_oop_map_count = total_oop_map_count;
3718   info->instance_size = instance_size;
3719   info->static_field_size = static_field_size;
3720   info->nonstatic_field_size = nonstatic_field_size;
3721   info->has_nonstatic_fields = has_nonstatic_fields;
3722 }
3723 
3724 
3725 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3726                                                     ClassLoaderData* loader_data,
3727                                                     Handle protection_domain,
3728                                                     KlassHandle host_klass,
3729                                                     GrowableArray<Handle>* cp_patches,
3730                                                     TempNewSymbol& parsed_name,
3731                                                     bool verify,
3732                                                     TRAPS) {
3733 
3734   // When a retransformable agent is attached, JVMTI caches the
3735   // class bytes that existed before the first retransformation.
3736   // If RedefineClasses() was used before the retransformable
3737   // agent attached, then the cached class bytes may not be the
3738   // original class bytes.
3739   JvmtiCachedClassFileData *cached_class_file = NULL;
3740   Handle class_loader(THREAD, loader_data->class_loader());
3741   bool has_default_methods = false;
3742   bool declares_default_methods = false;
3743   ResourceMark rm(THREAD);
3744 
3745   ClassFileStream* cfs = stream();
3746   // Timing
3747   assert(THREAD->is_Java_thread(), "must be a JavaThread");
3748   JavaThread* jt = (JavaThread*) THREAD;
3749 
3750   PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3751                             ClassLoader::perf_class_parse_selftime(),
3752                             NULL,
3753                             jt->get_thread_stat()->perf_recursion_counts_addr(),
3754                             jt->get_thread_stat()->perf_timers_addr(),
3755                             PerfClassTraceTime::PARSE_CLASS);
3756 
3757   init_parsed_class_attributes(loader_data);
3758 
3759   if (JvmtiExport::should_post_class_file_load_hook()) {
3760     // Get the cached class file bytes (if any) from the class that
3761     // is being redefined or retransformed. We use jvmti_thread_state()
3762     // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3763     // a JvmtiThreadState any earlier than necessary. This will help
3764     // avoid the bug described by 7126851.
3765     JvmtiThreadState *state = jt->jvmti_thread_state();
3766     if (state != NULL) {
3767       KlassHandle *h_class_being_redefined =
3768                      state->get_class_being_redefined();
3769       if (h_class_being_redefined != NULL) {
3770         instanceKlassHandle ikh_class_being_redefined =
3771           instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3772         cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3773       }
3774     }
3775 
3776     unsigned char* ptr = cfs->buffer();
3777     unsigned char* end_ptr = cfs->buffer() + cfs->length();
3778 
3779     JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3780                                            &ptr, &end_ptr, &cached_class_file);
3781 
3782     if (ptr != cfs->buffer()) {
3783       // JVMTI agent has modified class file data.
3784       // Set new class file stream using JVMTI agent modified
3785       // class file data.
3786       cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3787       set_stream(cfs);
3788     }
3789   }
3790 
3791   _host_klass = host_klass;
3792   _cp_patches = cp_patches;
3793 
3794   instanceKlassHandle nullHandle;
3795 
3796   // Figure out whether we can skip format checking (matching classic VM behavior)
3797   if (DumpSharedSpaces) {
3798     // verify == true means it's a 'remote' class (i.e., non-boot class)
3799     // Verification decision is based on BytecodeVerificationRemote flag
3800     // for those classes.
3801     _need_verify = (verify) ? BytecodeVerificationRemote :
3802                               BytecodeVerificationLocal;
3803   } else {
3804     _need_verify = Verifier::should_verify_for(class_loader(), verify);
3805   }
3806 
3807   // Set the verify flag in stream
3808   cfs->set_verify(_need_verify);
3809 
3810   // Save the class file name for easier error message printing.
3811   _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3812 
3813   cfs->guarantee_more(8, CHECK_(nullHandle));  // magic, major, minor
3814   // Magic value
3815   u4 magic = cfs->get_u4_fast();
3816   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3817                      "Incompatible magic value %u in class file %s",
3818                      magic, CHECK_(nullHandle));
3819 
3820   // Version numbers
3821   u2 minor_version = cfs->get_u2_fast();
3822   u2 major_version = cfs->get_u2_fast();
3823 
3824   if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3825     ResourceMark rm;
3826     warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3827             major_version,  minor_version, name->as_C_string());
3828     Exceptions::fthrow(
3829       THREAD_AND_LOCATION,
3830       vmSymbols::java_lang_UnsupportedClassVersionError(),
3831       "Unsupported major.minor version for dump time %u.%u",
3832       major_version,
3833       minor_version);
3834   }
3835 
3836   // Check version numbers - we check this even with verifier off
3837   if (!is_supported_version(major_version, minor_version)) {
3838     if (name == NULL) {
3839       Exceptions::fthrow(
3840         THREAD_AND_LOCATION,
3841         vmSymbols::java_lang_UnsupportedClassVersionError(),
3842         "Unsupported class file version %u.%u, "
3843         "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3844         major_version,
3845         minor_version,
3846         JAVA_MAX_SUPPORTED_VERSION,
3847         JAVA_MAX_SUPPORTED_MINOR_VERSION);
3848     } else {
3849       ResourceMark rm(THREAD);
3850       Exceptions::fthrow(
3851         THREAD_AND_LOCATION,
3852         vmSymbols::java_lang_UnsupportedClassVersionError(),
3853         "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3854         "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3855         name->as_C_string(),
3856         major_version,
3857         minor_version,
3858         JAVA_MAX_SUPPORTED_VERSION,
3859         JAVA_MAX_SUPPORTED_MINOR_VERSION);
3860     }
3861     return nullHandle;
3862   }
3863 
3864   _major_version = major_version;
3865   _minor_version = minor_version;
3866 
3867 
3868   // Check if verification needs to be relaxed for this class file
3869   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3870   _relax_verify = Verifier::relax_verify_for(class_loader());
3871 
3872   // Constant pool
3873   constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3874 
3875   int cp_size = cp->length();
3876 
3877   cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
3878 
3879   // Access flags
3880   AccessFlags access_flags;
3881   jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3882 
3883   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3884     // Set abstract bit for old class files for backward compatibility
3885     flags |= JVM_ACC_ABSTRACT;
3886   }
3887   verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3888   access_flags.set_flags(flags);
3889 
3890   // This class and superclass
3891   u2 this_class_index = cfs->get_u2_fast();
3892   check_property(
3893     valid_cp_range(this_class_index, cp_size) &&
3894       cp->tag_at(this_class_index).is_unresolved_klass(),
3895     "Invalid this class index %u in constant pool in class file %s",
3896     this_class_index, CHECK_(nullHandle));
3897 
3898   Symbol*  class_name  = cp->klass_name_at(this_class_index);
3899   assert(class_name != NULL, "class_name can't be null");
3900 
3901   // It's important to set parsed_name *before* resolving the super class.
3902   // (it's used for cleanup by the caller if parsing fails)
3903   parsed_name = class_name;
3904   // parsed_name is returned and can be used if there's an error, so add to
3905   // its reference count.  Caller will decrement the refcount.
3906   parsed_name->increment_refcount();
3907 
3908   // Update _class_name which could be null previously to be class_name
3909   _class_name = class_name;
3910 
3911   // Don't need to check whether this class name is legal or not.
3912   // It has been checked when constant pool is parsed.
3913   // However, make sure it is not an array type.
3914   if (_need_verify) {
3915     guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3916                        "Bad class name in class file %s",
3917                        CHECK_(nullHandle));
3918   }
3919 
3920   Klass* preserve_this_klass;   // for storing result across HandleMark
3921 
3922   // release all handles when parsing is done
3923   { HandleMark hm(THREAD);
3924 
3925     // Checks if name in class file matches requested name
3926     if (name != NULL && class_name != name) {
3927       ResourceMark rm(THREAD);
3928       Exceptions::fthrow(
3929         THREAD_AND_LOCATION,
3930         vmSymbols::java_lang_NoClassDefFoundError(),
3931         "%s (wrong name: %s)",
3932         name->as_C_string(),
3933         class_name->as_C_string()
3934       );
3935       return nullHandle;
3936     }
3937 
3938     if (TraceClassLoadingPreorder) {
3939       tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3940       if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3941       tty->print_cr("]");
3942     }
3943 #if INCLUDE_CDS
3944     if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3945       // Only dump the classes that can be stored into CDS archive
3946       if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3947         if (name != NULL) {
3948           ResourceMark rm(THREAD);
3949           classlist_file->print_cr("%s", name->as_C_string());
3950           classlist_file->flush();
3951         }
3952       }
3953     }
3954 #endif
3955 
3956     u2 super_class_index = cfs->get_u2_fast();
3957     instanceKlassHandle super_klass = parse_super_class(super_class_index,
3958                                                         CHECK_NULL);
3959 
3960     // Interfaces
3961     u2 itfs_len = cfs->get_u2_fast();
3962     Array<Klass*>* local_interfaces =
3963       parse_interfaces(itfs_len, protection_domain, _class_name,
3964                        &has_default_methods, CHECK_(nullHandle));
3965 
3966     u2 java_fields_count = 0;
3967     // Fields (offsets are filled in later)
3968     FieldAllocationCount fac;
3969     Array<u2>* fields = parse_fields(class_name,
3970                                      access_flags.is_interface(),
3971                                      &fac, &java_fields_count,
3972                                      CHECK_(nullHandle));
3973     // Methods
3974     bool has_final_method = false;
3975     AccessFlags promoted_flags;
3976     promoted_flags.set_flags(0);
3977     Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3978                                             &promoted_flags,
3979                                             &has_final_method,
3980                                             &declares_default_methods,
3981                                             CHECK_(nullHandle));
3982 
3983     if (declares_default_methods) {
3984       has_default_methods = true;
3985     }
3986 
3987     // Additional attributes
3988     ClassAnnotationCollector parsed_annotations;
3989     parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3990 
3991     // Finalize the Annotations metadata object,
3992     // now that all annotation arrays have been created.
3993     create_combined_annotations(CHECK_(nullHandle));
3994 
3995     // Make sure this is the end of class file stream
3996     guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3997 
3998     // We check super class after class file is parsed and format is checked
3999     if (super_class_index > 0 && super_klass.is_null()) {
4000       Symbol*  sk  = cp->klass_name_at(super_class_index);
4001       if (access_flags.is_interface()) {
4002         // Before attempting to resolve the superclass, check for class format
4003         // errors not checked yet.
4004         guarantee_property(sk == vmSymbols::java_lang_Object(),
4005                            "Interfaces must have java.lang.Object as superclass in class file %s",
4006                            CHECK_(nullHandle));
4007       }
4008       Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4009                                                          class_loader,
4010                                                          protection_domain,
4011                                                          true,
4012                                                          CHECK_(nullHandle));
4013 
4014       KlassHandle kh (THREAD, k);
4015       super_klass = instanceKlassHandle(THREAD, kh());
4016     }
4017     if (super_klass.not_null()) {
4018 
4019       if (super_klass->has_default_methods()) {
4020         has_default_methods = true;
4021       }
4022 
4023       if (super_klass->is_interface()) {
4024         ResourceMark rm(THREAD);
4025         Exceptions::fthrow(
4026           THREAD_AND_LOCATION,
4027           vmSymbols::java_lang_IncompatibleClassChangeError(),
4028           "class %s has interface %s as super class",
4029           class_name->as_klass_external_name(),
4030           super_klass->external_name()
4031         );
4032         return nullHandle;
4033       }
4034       // Make sure super class is not final
4035       if (super_klass->is_final()) {
4036         THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4037       }
4038     }
4039 
4040     // save super klass for error handling.
4041     _super_klass = super_klass;
4042 
4043     // Compute the transitive list of all unique interfaces implemented by this class
4044     _transitive_interfaces =
4045           compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4046 
4047     // sort methods
4048     intArray* method_ordering = sort_methods(methods);
4049 
4050     // promote flags from parse_methods() to the klass' flags
4051     access_flags.add_promoted_flags(promoted_flags.as_int());
4052 
4053     // Size of Java vtable (in words)
4054     int vtable_size = 0;
4055     int itable_size = 0;
4056     int num_miranda_methods = 0;
4057 
4058     GrowableArray<Method*> all_mirandas(20);
4059 
4060     klassVtable::compute_vtable_size_and_num_mirandas(
4061         &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4062         access_flags, class_loader, class_name, local_interfaces,
4063                                                       CHECK_(nullHandle));
4064 
4065     // Size of Java itable (in words)
4066     itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4067 
4068     FieldLayoutInfo info;
4069     layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4070 
4071     int total_oop_map_size2 =
4072           InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4073 
4074     // Compute reference type
4075     ReferenceType rt;
4076     if (super_klass() == NULL) {
4077       rt = REF_NONE;
4078     } else {
4079       rt = super_klass->reference_type();
4080     }
4081 
4082     // We can now create the basic Klass* for this klass
4083     _klass = InstanceKlass::allocate_instance_klass(loader_data,
4084                                                     vtable_size,
4085                                                     itable_size,
4086                                                     info.static_field_size,
4087                                                     total_oop_map_size2,
4088                                                     rt,
4089                                                     access_flags,
4090                                                     name,
4091                                                     super_klass(),
4092                                                     !host_klass.is_null(),
4093                                                     CHECK_(nullHandle));
4094     instanceKlassHandle this_klass (THREAD, _klass);
4095 
4096     assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4097     assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4098            "sanity");
4099 
4100     // Fill in information already parsed
4101     this_klass->set_should_verify_class(verify);
4102     jint lh = Klass::instance_layout_helper(info.instance_size, false);
4103     this_klass->set_layout_helper(lh);
4104     assert(this_klass->oop_is_instance(), "layout is correct");
4105     assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4106     // Not yet: supers are done below to support the new subtype-checking fields
4107     //this_klass->set_super(super_klass());
4108     this_klass->set_class_loader_data(loader_data);
4109     this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4110     this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4111     this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4112 
4113     apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4114 
4115     if (has_final_method) {
4116       this_klass->set_has_final_method();
4117     }
4118     this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4119     // The InstanceKlass::_methods_jmethod_ids cache
4120     // is managed on the assumption that the initial cache
4121     // size is equal to the number of methods in the class. If
4122     // that changes, then InstanceKlass::idnum_can_increment()
4123     // has to be changed accordingly.
4124     this_klass->set_initial_method_idnum(methods->length());
4125     this_klass->set_name(cp->klass_name_at(this_class_index));
4126     if (is_anonymous())  // I am well known to myself
4127       cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4128 
4129     this_klass->set_minor_version(minor_version);
4130     this_klass->set_major_version(major_version);
4131     this_klass->set_has_default_methods(has_default_methods);
4132     this_klass->set_declares_default_methods(declares_default_methods);
4133 
4134     if (!host_klass.is_null()) {
4135       assert (this_klass->is_anonymous(), "should be the same");
4136       this_klass->set_host_klass(host_klass());
4137     }
4138 
4139     // Set up Method*::intrinsic_id as soon as we know the names of methods.
4140     // (We used to do this lazily, but now we query it in Rewriter,
4141     // which is eagerly done for every method, so we might as well do it now,
4142     // when everything is fresh in memory.)
4143     vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass());
4144     if (klass_id != vmSymbols::NO_SID) {
4145       for (int j = 0; j < methods->length(); j++) {
4146         Method* method = methods->at(j);
4147         method->init_intrinsic_id();
4148 
4149         if (CheckIntrinsics) {
4150           // Check if an intrinsic is defined for method 'method',
4151           // but the method is not annotated with @HotSpotIntrinsicCandidate.
4152           if (method->intrinsic_id() != vmIntrinsics::_none &&
4153               !method->intrinsic_candidate()) {
4154             tty->print("Compiler intrinsic is defined for method [%s], "
4155                        "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
4156                        method->name_and_sig_as_C_string(),
4157                        NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4158                        );
4159             tty->cr();
4160             DEBUG_ONLY(vm_exit(1));
4161           }
4162           // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
4163           // but there is no intrinsic available for it.
4164           if (method->intrinsic_candidate() &&
4165               method->intrinsic_id() == vmIntrinsics::_none) {
4166             tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
4167                        "but no compiler intrinsic is defined for the method.%s",
4168                        method->name_and_sig_as_C_string(),
4169                        NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4170                        );
4171             tty->cr();
4172             DEBUG_ONLY(vm_exit(1));
4173           }
4174         }
4175       }
4176 
4177 #ifdef ASSERT
4178       if (CheckIntrinsics) {
4179         // Check for orphan methods in the current class. A method m
4180         // of a class C is orphan if an intrinsic is defined for method m,
4181         // but class C does not declare m.
4182         // The check is potentially expensive, therefore it is available
4183         // only in debug builds.
4184 
4185         for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) {
4186           if (id == vmIntrinsics::_compiledLambdaForm) {
4187             // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4188             // generated for the JVM from a LambdaForm and therefore no method
4189             // is defined for it.
4190             continue;
4191           }
4192 
4193           if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
4194             // Check if the current class contains a method with the same
4195             // name, flags, signature.
4196             bool match = false;
4197             for (int j = 0; j < methods->length(); j++) {
4198               Method* method = methods->at(j);
4199               if (id == method->intrinsic_id()) {
4200                 match = true;
4201                 break;
4202               }
4203             }
4204 
4205             if (!match) {
4206               char buf[1000];
4207               tty->print("Compiler intrinsic is defined for method [%s], "
4208                          "but the method is not available in class [%s].%s",
4209                          vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)),
4210                          this_klass->name()->as_C_string(),
4211                          NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4212                          );
4213               tty->cr();
4214               DEBUG_ONLY(vm_exit(1));
4215             }
4216           }
4217         }
4218       }
4219 #endif // ASSERT
4220     }
4221 
4222 
4223     if (cached_class_file != NULL) {
4224       // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4225       this_klass->set_cached_class_file(cached_class_file);
4226     }
4227 
4228     // Fill in field values obtained by parse_classfile_attributes
4229     if (parsed_annotations.has_any_annotations())
4230       parsed_annotations.apply_to(this_klass);
4231     apply_parsed_class_attributes(this_klass);
4232 
4233     // Miranda methods
4234     if ((num_miranda_methods > 0) ||
4235         // if this class introduced new miranda methods or
4236         (super_klass.not_null() && (super_klass->has_miranda_methods()))
4237         // super class exists and this class inherited miranda methods
4238         ) {
4239       this_klass->set_has_miranda_methods(); // then set a flag
4240     }
4241 
4242     // Fill in information needed to compute superclasses.
4243     this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4244 
4245     // Initialize itable offset tables
4246     klassItable::setup_itable_offset_table(this_klass);
4247 
4248     // Compute transitive closure of interfaces this class implements
4249     // Do final class setup
4250     fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4251 
4252     // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4253     set_precomputed_flags(this_klass);
4254 
4255     // reinitialize modifiers, using the InnerClasses attribute
4256     int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4257     this_klass->set_modifier_flags(computed_modifiers);
4258 
4259     // check if this class can access its super class
4260     check_super_class_access(this_klass, CHECK_(nullHandle));
4261 
4262     // check if this class can access its superinterfaces
4263     check_super_interface_access(this_klass, CHECK_(nullHandle));
4264 
4265     // check if this class overrides any final method
4266     check_final_method_override(this_klass, CHECK_(nullHandle));
4267 
4268     // check that if this class is an interface then it doesn't have static methods
4269     if (this_klass->is_interface()) {
4270       /* An interface in a JAVA 8 classfile can be static */
4271       if (_major_version < JAVA_8_VERSION) {
4272         check_illegal_static_method(this_klass, CHECK_(nullHandle));
4273       }
4274     }
4275 
4276     // Allocate mirror and initialize static fields
4277     java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4278                                    CHECK_(nullHandle));
4279 
4280     // Generate any default methods - default methods are interface methods
4281     // that have a default implementation.  This is new with Lambda project.
4282     if (has_default_methods ) {
4283       DefaultMethods::generate_default_methods(
4284           this_klass(), &all_mirandas, CHECK_(nullHandle));
4285     }
4286 
4287     // Update the loader_data graph.
4288     record_defined_class_dependencies(this_klass, CHECK_NULL);
4289 
4290     ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4291                                              false /* not shared class */);
4292 
4293     if (TraceClassLoading) {
4294       ResourceMark rm;
4295       // print in a single call to reduce interleaving of output
4296       if (cfs->source() != NULL) {
4297         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4298                    cfs->source());
4299       } else if (class_loader.is_null()) {
4300         Klass* caller =
4301             THREAD->is_Java_thread()
4302                 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4303                 : NULL;
4304         // caller can be NULL, for example, during a JVMTI VM_Init hook
4305         if (caller != NULL) {
4306           tty->print("[Loaded %s by instance of %s]\n",
4307                      this_klass->external_name(),
4308                      InstanceKlass::cast(caller)->external_name());
4309         } else {
4310           tty->print("[Loaded %s]\n", this_klass->external_name());
4311         }
4312       } else {
4313         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4314                    InstanceKlass::cast(class_loader->klass())->external_name());
4315       }
4316     }
4317 
4318     if (TraceClassResolution) {
4319       ResourceMark rm;
4320       // print out the superclass.
4321       const char * from = this_klass()->external_name();
4322       if (this_klass->java_super() != NULL) {
4323         tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4324       }
4325       // print out each of the interface classes referred to by this class.
4326       Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4327       if (local_interfaces != NULL) {
4328         int length = local_interfaces->length();
4329         for (int i = 0; i < length; i++) {
4330           Klass* k = local_interfaces->at(i);
4331           InstanceKlass* to_class = InstanceKlass::cast(k);
4332           const char * to = to_class->external_name();
4333           tty->print("RESOLVE %s %s (interface)\n", from, to);
4334         }
4335       }
4336     }
4337 
4338     // preserve result across HandleMark
4339     preserve_this_klass = this_klass();
4340   }
4341 
4342   // Create new handle outside HandleMark (might be needed for
4343   // Extended Class Redefinition)
4344   instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4345   debug_only(this_klass->verify();)
4346 
4347   // Clear class if no error has occurred so destructor doesn't deallocate it
4348   _klass = NULL;
4349   return this_klass;
4350 }
4351 
4352 // Destructor to clean up if there's an error
4353 ClassFileParser::~ClassFileParser() {
4354   MetadataFactory::free_metadata(_loader_data, _cp);
4355   MetadataFactory::free_array<u2>(_loader_data, _fields);
4356 
4357   // Free methods
4358   InstanceKlass::deallocate_methods(_loader_data, _methods);
4359 
4360   // beware of the Universe::empty_blah_array!!
4361   if (_inner_classes != Universe::the_empty_short_array()) {
4362     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4363   }
4364 
4365   // Free interfaces
4366   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4367                                        _local_interfaces, _transitive_interfaces);
4368 
4369   if (_combined_annotations != NULL) {
4370     // After all annotations arrays have been created, they are installed into the
4371     // Annotations object that will be assigned to the InstanceKlass being created.
4372 
4373     // Deallocate the Annotations object and the installed annotations arrays.
4374     _combined_annotations->deallocate_contents(_loader_data);
4375 
4376     // If the _combined_annotations pointer is non-NULL,
4377     // then the other annotations fields should have been cleared.
4378     assert(_annotations             == NULL, "Should have been cleared");
4379     assert(_type_annotations        == NULL, "Should have been cleared");
4380     assert(_fields_annotations      == NULL, "Should have been cleared");
4381     assert(_fields_type_annotations == NULL, "Should have been cleared");
4382   } else {
4383     // If the annotations arrays were not installed into the Annotations object,
4384     // then they have to be deallocated explicitly.
4385     MetadataFactory::free_array<u1>(_loader_data, _annotations);
4386     MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4387     Annotations::free_contents(_loader_data, _fields_annotations);
4388     Annotations::free_contents(_loader_data, _fields_type_annotations);
4389   }
4390 
4391   clear_class_metadata();
4392 
4393   // deallocate the klass if already created.  Don't directly deallocate, but add
4394   // to the deallocate list so that the klass is removed from the CLD::_klasses list
4395   // at a safepoint.
4396   if (_klass != NULL) {
4397     _loader_data->add_to_deallocate_list(_klass);
4398   }
4399   _klass = NULL;
4400 }
4401 
4402 void ClassFileParser::print_field_layout(Symbol* name,
4403                                          Array<u2>* fields,
4404                                          constantPoolHandle cp,
4405                                          int instance_size,
4406                                          int instance_fields_start,
4407                                          int instance_fields_end,
4408                                          int static_fields_end) {
4409   tty->print("%s: field layout\n", name->as_klass_external_name());
4410   tty->print("  @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4411   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4412     if (!fs.access_flags().is_static()) {
4413       tty->print("  @%3d \"%s\" %s\n",
4414           fs.offset(),
4415           fs.name()->as_klass_external_name(),
4416           fs.signature()->as_klass_external_name());
4417     }
4418   }
4419   tty->print("  @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4420   tty->print("  @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4421   tty->print("  @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4422   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4423     if (fs.access_flags().is_static()) {
4424       tty->print("  @%3d \"%s\" %s\n",
4425           fs.offset(),
4426           fs.name()->as_klass_external_name(),
4427           fs.signature()->as_klass_external_name());
4428     }
4429   }
4430   tty->print("  @%3d %s\n", static_fields_end, "--- static fields end ---");
4431   tty->print("\n");
4432 }
4433 
4434 unsigned int
4435 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4436                                        unsigned int nonstatic_oop_map_count,
4437                                        int first_nonstatic_oop_offset) {
4438   unsigned int map_count =
4439     super.is_null() ? 0 : super->nonstatic_oop_map_count();
4440   if (nonstatic_oop_map_count > 0) {
4441     // We have oops to add to map
4442     if (map_count == 0) {
4443       map_count = nonstatic_oop_map_count;
4444     } else {
4445       // Check whether we should add a new map block or whether the last one can
4446       // be extended
4447       OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4448       OopMapBlock* const last_map = first_map + map_count - 1;
4449 
4450       int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4451       if (next_offset == first_nonstatic_oop_offset) {
4452         // There is no gap bettwen superklass's last oop field and first
4453         // local oop field, merge maps.
4454         nonstatic_oop_map_count -= 1;
4455       } else {
4456         // Superklass didn't end with a oop field, add extra maps
4457         assert(next_offset < first_nonstatic_oop_offset, "just checking");
4458       }
4459       map_count += nonstatic_oop_map_count;
4460     }
4461   }
4462   return map_count;
4463 }
4464 
4465 
4466 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4467                                     unsigned int nonstatic_oop_map_count,
4468                                     int* nonstatic_oop_offsets,
4469                                     unsigned int* nonstatic_oop_counts) {
4470   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4471   const InstanceKlass* const super = k->superklass();
4472   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4473   if (super_count > 0) {
4474     // Copy maps from superklass
4475     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4476     for (unsigned int i = 0; i < super_count; ++i) {
4477       *this_oop_map++ = *super_oop_map++;
4478     }
4479   }
4480 
4481   if (nonstatic_oop_map_count > 0) {
4482     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4483       // The counts differ because there is no gap between superklass's last oop
4484       // field and the first local oop field.  Extend the last oop map copied
4485       // from the superklass instead of creating new one.
4486       nonstatic_oop_map_count--;
4487       nonstatic_oop_offsets++;
4488       this_oop_map--;
4489       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4490       this_oop_map++;
4491     }
4492 
4493     // Add new map blocks, fill them
4494     while (nonstatic_oop_map_count-- > 0) {
4495       this_oop_map->set_offset(*nonstatic_oop_offsets++);
4496       this_oop_map->set_count(*nonstatic_oop_counts++);
4497       this_oop_map++;
4498     }
4499     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4500            this_oop_map, "sanity");
4501   }
4502 }
4503 
4504 
4505 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4506   Klass* super = k->super();
4507 
4508   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4509   // in which case we don't have to register objects as finalizable
4510   if (!_has_empty_finalizer) {
4511     if (_has_finalizer ||
4512         (super != NULL && super->has_finalizer())) {
4513       k->set_has_finalizer();
4514     }
4515   }
4516 
4517 #ifdef ASSERT
4518   bool f = false;
4519   Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4520                                  vmSymbols::void_method_signature());
4521   if (m != NULL && !m->is_empty_method()) {
4522       f = true;
4523   }
4524 
4525   // Spec doesn't prevent agent from redefinition of empty finalizer.
4526   // Despite the fact that it's generally bad idea and redefined finalizer
4527   // will not work as expected we shouldn't abort vm in this case
4528   if (!k->has_redefined_this_or_super()) {
4529     assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4530   }
4531 #endif
4532 
4533   // Check if this klass supports the java.lang.Cloneable interface
4534   if (SystemDictionary::Cloneable_klass_loaded()) {
4535     if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4536       k->set_is_cloneable();
4537     }
4538   }
4539 
4540   // Check if this klass has a vanilla default constructor
4541   if (super == NULL) {
4542     // java.lang.Object has empty default constructor
4543     k->set_has_vanilla_constructor();
4544   } else {
4545     if (super->has_vanilla_constructor() &&
4546         _has_vanilla_constructor) {
4547       k->set_has_vanilla_constructor();
4548     }
4549 #ifdef ASSERT
4550     bool v = false;
4551     if (super->has_vanilla_constructor()) {
4552       Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4553 ), vmSymbols::void_method_signature());
4554       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4555         v = true;
4556       }
4557     }
4558     assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4559 #endif
4560   }
4561 
4562   // If it cannot be fast-path allocated, set a bit in the layout helper.
4563   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4564   assert(k->size_helper() > 0, "layout_helper is initialized");
4565   if ((!RegisterFinalizersAtInit && k->has_finalizer())
4566       || k->is_abstract() || k->is_interface()
4567       || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4568       || k->size_helper() >= FastAllocateSizeLimit) {
4569     // Forbid fast-path allocation.
4570     jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4571     k->set_layout_helper(lh);
4572   }
4573 }
4574 
4575 // Attach super classes and interface classes to class loader data
4576 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4577   ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4578   if (defining_loader_data->is_the_null_class_loader_data()) {
4579       // Dependencies to null class loader data are implicit.
4580       return;
4581   } else {
4582     // add super class dependency
4583     Klass* super = defined_klass->super();
4584     if (super != NULL) {
4585       defining_loader_data->record_dependency(super, CHECK);
4586     }
4587 
4588     // add super interface dependencies
4589     Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4590     if (local_interfaces != NULL) {
4591       int length = local_interfaces->length();
4592       for (int i = 0; i < length; i++) {
4593         defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4594       }
4595     }
4596   }
4597 }
4598 
4599 // utility methods for appending an array with check for duplicates
4600 
4601 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4602   // iterate over new interfaces
4603   for (int i = 0; i < ifs->length(); i++) {
4604     Klass* e = ifs->at(i);
4605     assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4606     // add new interface
4607     result->append_if_missing(e);
4608   }
4609 }
4610 
4611 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4612                                         instanceKlassHandle super,
4613                                         Array<Klass*>* local_ifs, TRAPS) {
4614   // Compute maximum size for transitive interfaces
4615   int max_transitive_size = 0;
4616   int super_size = 0;
4617   // Add superclass transitive interfaces size
4618   if (super.not_null()) {
4619     super_size = super->transitive_interfaces()->length();
4620     max_transitive_size += super_size;
4621   }
4622   // Add local interfaces' super interfaces
4623   int local_size = local_ifs->length();
4624   for (int i = 0; i < local_size; i++) {
4625     Klass* l = local_ifs->at(i);
4626     max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4627   }
4628   // Finally add local interfaces
4629   max_transitive_size += local_size;
4630   // Construct array
4631   if (max_transitive_size == 0) {
4632     // no interfaces, use canonicalized array
4633     return Universe::the_empty_klass_array();
4634   } else if (max_transitive_size == super_size) {
4635     // no new local interfaces added, share superklass' transitive interface array
4636     return super->transitive_interfaces();
4637   } else if (max_transitive_size == local_size) {
4638     // only local interfaces added, share local interface array
4639     return local_ifs;
4640   } else {
4641     ResourceMark rm;
4642     GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4643 
4644     // Copy down from superclass
4645     if (super.not_null()) {
4646       append_interfaces(result, super->transitive_interfaces());
4647     }
4648 
4649     // Copy down from local interfaces' superinterfaces
4650     for (int i = 0; i < local_ifs->length(); i++) {
4651       Klass* l = local_ifs->at(i);
4652       append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4653     }
4654     // Finally add local interfaces
4655     append_interfaces(result, local_ifs);
4656 
4657     // length will be less than the max_transitive_size if duplicates were removed
4658     int length = result->length();
4659     assert(length <= max_transitive_size, "just checking");
4660     Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4661     for (int i = 0; i < length; i++) {
4662       Klass* e = result->at(i);
4663         assert(e != NULL, "just checking");
4664       new_result->at_put(i, e);
4665     }
4666     return new_result;
4667   }
4668 }
4669 
4670 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4671   Klass* super = this_klass->super();
4672   if ((super != NULL) &&
4673       (!Reflection::verify_class_access(this_klass(), super, false))) {
4674     ResourceMark rm(THREAD);
4675     Exceptions::fthrow(
4676       THREAD_AND_LOCATION,
4677       vmSymbols::java_lang_IllegalAccessError(),
4678       "class %s cannot access its superclass %s",
4679       this_klass->external_name(),
4680       InstanceKlass::cast(super)->external_name()
4681     );
4682     return;
4683   }
4684 }
4685 
4686 
4687 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4688   Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4689   int lng = local_interfaces->length();
4690   for (int i = lng - 1; i >= 0; i--) {
4691     Klass* k = local_interfaces->at(i);
4692     assert (k != NULL && k->is_interface(), "invalid interface");
4693     if (!Reflection::verify_class_access(this_klass(), k, false)) {
4694       ResourceMark rm(THREAD);
4695       Exceptions::fthrow(
4696         THREAD_AND_LOCATION,
4697         vmSymbols::java_lang_IllegalAccessError(),
4698         "class %s cannot access its superinterface %s",
4699         this_klass->external_name(),
4700         InstanceKlass::cast(k)->external_name()
4701       );
4702       return;
4703     }
4704   }
4705 }
4706 
4707 
4708 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4709   Array<Method*>* methods = this_klass->methods();
4710   int num_methods = methods->length();
4711 
4712   // go thru each method and check if it overrides a final method
4713   for (int index = 0; index < num_methods; index++) {
4714     Method* m = methods->at(index);
4715 
4716     // skip private, static, and <init> methods
4717     if ((!m->is_private() && !m->is_static()) &&
4718         (m->name() != vmSymbols::object_initializer_name())) {
4719 
4720       Symbol* name = m->name();
4721       Symbol* signature = m->signature();
4722       Klass* k = this_klass->super();
4723       Method* super_m = NULL;
4724       while (k != NULL) {
4725         // skip supers that don't have final methods.
4726         if (k->has_final_method()) {
4727           // lookup a matching method in the super class hierarchy
4728           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4729           if (super_m == NULL) {
4730             break; // didn't find any match; get out
4731           }
4732 
4733           if (super_m->is_final() && !super_m->is_static() &&
4734               // matching method in super is final, and not static
4735               (Reflection::verify_field_access(this_klass(),
4736                                                super_m->method_holder(),
4737                                                super_m->method_holder(),
4738                                                super_m->access_flags(), false))
4739             // this class can access super final method and therefore override
4740             ) {
4741             ResourceMark rm(THREAD);
4742             Exceptions::fthrow(
4743               THREAD_AND_LOCATION,
4744               vmSymbols::java_lang_VerifyError(),
4745               "class %s overrides final method %s.%s%s",
4746               this_klass->external_name(),
4747               super_m->method_holder()->external_name(),
4748               name->as_C_string(),
4749               signature->as_C_string()
4750             );
4751             return;
4752           }
4753 
4754           // continue to look from super_m's holder's super.
4755           k = super_m->method_holder()->super();
4756           continue;
4757         }
4758 
4759         k = k->super();
4760       }
4761     }
4762   }
4763 }
4764 
4765 
4766 // assumes that this_klass is an interface
4767 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4768   assert(this_klass->is_interface(), "not an interface");
4769   Array<Method*>* methods = this_klass->methods();
4770   int num_methods = methods->length();
4771 
4772   for (int index = 0; index < num_methods; index++) {
4773     Method* m = methods->at(index);
4774     // if m is static and not the init method, throw a verify error
4775     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4776       ResourceMark rm(THREAD);
4777       Exceptions::fthrow(
4778         THREAD_AND_LOCATION,
4779         vmSymbols::java_lang_VerifyError(),
4780         "Illegal static method %s in interface %s",
4781         m->name()->as_C_string(),
4782         this_klass->external_name()
4783       );
4784       return;
4785     }
4786   }
4787 }
4788 
4789 // utility methods for format checking
4790 
4791 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4792   if (!_need_verify) { return; }
4793 
4794   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4795   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4796   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4797   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4798   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4799   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4800   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
4801 
4802   if ((is_abstract && is_final) ||
4803       (is_interface && !is_abstract) ||
4804       (is_interface && major_gte_15 && (is_super || is_enum)) ||
4805       (!is_interface && major_gte_15 && is_annotation)) {
4806     ResourceMark rm(THREAD);
4807     Exceptions::fthrow(
4808       THREAD_AND_LOCATION,
4809       vmSymbols::java_lang_ClassFormatError(),
4810       "Illegal class modifiers in class %s: 0x%X",
4811       _class_name->as_C_string(), flags
4812     );
4813     return;
4814   }
4815 }
4816 
4817 bool ClassFileParser::has_illegal_visibility(jint flags) {
4818   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4819   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4820   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4821 
4822   return ((is_public && is_protected) ||
4823           (is_public && is_private) ||
4824           (is_protected && is_private));
4825 }
4826 
4827 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4828   u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4829   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4830          (major <= max_version) &&
4831          ((major != max_version) ||
4832           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4833 }
4834 
4835 void ClassFileParser::verify_legal_field_modifiers(
4836     jint flags, bool is_interface, TRAPS) {
4837   if (!_need_verify) { return; }
4838 
4839   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4840   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4841   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4842   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4843   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4844   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4845   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4846   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4847   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4848 
4849   bool is_illegal = false;
4850 
4851   if (is_interface) {
4852     if (!is_public || !is_static || !is_final || is_private ||
4853         is_protected || is_volatile || is_transient ||
4854         (major_gte_15 && is_enum)) {
4855       is_illegal = true;
4856     }
4857   } else { // not interface
4858     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4859       is_illegal = true;
4860     }
4861   }
4862 
4863   if (is_illegal) {
4864     ResourceMark rm(THREAD);
4865     Exceptions::fthrow(
4866       THREAD_AND_LOCATION,
4867       vmSymbols::java_lang_ClassFormatError(),
4868       "Illegal field modifiers in class %s: 0x%X",
4869       _class_name->as_C_string(), flags);
4870     return;
4871   }
4872 }
4873 
4874 void ClassFileParser::verify_legal_method_modifiers(
4875     jint flags, bool is_interface, Symbol* name, TRAPS) {
4876   if (!_need_verify) { return; }
4877 
4878   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4879   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4880   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4881   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4882   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4883   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4884   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4885   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4886   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4887   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4888   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
4889   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4890   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4891 
4892   bool is_illegal = false;
4893 
4894   if (is_interface) {
4895     if (major_gte_8) {
4896       // Class file version is JAVA_8_VERSION or later Methods of
4897       // interfaces may set any of the flags except ACC_PROTECTED,
4898       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4899       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4900       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4901           (is_native || is_protected || is_final || is_synchronized) ||
4902           // If a specific method of a class or interface has its
4903           // ACC_ABSTRACT flag set, it must not have any of its
4904           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4905           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4906           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4907           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4908           (is_abstract && (is_private || is_static || is_strict))) {
4909         is_illegal = true;
4910       }
4911     } else if (major_gte_15) {
4912       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4913       if (!is_public || is_static || is_final || is_synchronized ||
4914           is_native || !is_abstract || is_strict) {
4915         is_illegal = true;
4916       }
4917     } else {
4918       // Class file version is pre-JAVA_1_5_VERSION
4919       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4920         is_illegal = true;
4921       }
4922     }
4923   } else { // not interface
4924     if (has_illegal_visibility(flags)) {
4925       is_illegal = true;
4926     } else {
4927       if (is_initializer) {
4928         if (is_static || is_final || is_synchronized || is_native ||
4929             is_abstract || (major_gte_15 && is_bridge)) {
4930           is_illegal = true;
4931         }
4932       } else { // not initializer
4933         if (is_abstract) {
4934           if ((is_final || is_native || is_private || is_static ||
4935               (major_gte_15 && (is_synchronized || is_strict)))) {
4936             is_illegal = true;
4937           }
4938         }
4939       }
4940     }
4941   }
4942 
4943   if (is_illegal) {
4944     ResourceMark rm(THREAD);
4945     Exceptions::fthrow(
4946       THREAD_AND_LOCATION,
4947       vmSymbols::java_lang_ClassFormatError(),
4948       "Method %s in class %s has illegal modifiers: 0x%X",
4949       name->as_C_string(), _class_name->as_C_string(), flags);
4950     return;
4951   }
4952 }
4953 
4954 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4955   assert(_need_verify, "only called when _need_verify is true");
4956   int i = 0;
4957   int count = length >> 2;
4958   for (int k=0; k<count; k++) {
4959     unsigned char b0 = buffer[i];
4960     unsigned char b1 = buffer[i+1];
4961     unsigned char b2 = buffer[i+2];
4962     unsigned char b3 = buffer[i+3];
4963     // For an unsigned char v,
4964     // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4965     // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4966     unsigned char res = b0 | b0 - 1 |
4967                         b1 | b1 - 1 |
4968                         b2 | b2 - 1 |
4969                         b3 | b3 - 1;
4970     if (res >= 128) break;
4971     i += 4;
4972   }
4973   for(; i < length; i++) {
4974     unsigned short c;
4975     // no embedded zeros
4976     guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4977     if(buffer[i] < 128) {
4978       continue;
4979     }
4980     if ((i + 5) < length) { // see if it's legal supplementary character
4981       if (UTF8::is_supplementary_character(&buffer[i])) {
4982         c = UTF8::get_supplementary_character(&buffer[i]);
4983         i += 5;
4984         continue;
4985       }
4986     }
4987     switch (buffer[i] >> 4) {
4988       default: break;
4989       case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4990         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4991       case 0xC: case 0xD:  // 110xxxxx  10xxxxxx
4992         c = (buffer[i] & 0x1F) << 6;
4993         i++;
4994         if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4995           c += buffer[i] & 0x3F;
4996           if (_major_version <= 47 || c == 0 || c >= 0x80) {
4997             // for classes with major > 47, c must a null or a character in its shortest form
4998             break;
4999           }
5000         }
5001         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5002       case 0xE:  // 1110xxxx 10xxxxxx 10xxxxxx
5003         c = (buffer[i] & 0xF) << 12;
5004         i += 2;
5005         if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
5006           c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
5007           if (_major_version <= 47 || c >= 0x800) {
5008             // for classes with major > 47, c must be in its shortest form
5009             break;
5010           }
5011         }
5012         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5013     }  // end of switch
5014   } // end of for
5015 }
5016 
5017 // Checks if name is a legal class name.
5018 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
5019   if (!_need_verify || _relax_verify) { return; }
5020 
5021   char buf[fixed_buffer_size];
5022   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5023   unsigned int length = name->utf8_length();
5024   bool legal = false;
5025 
5026   if (length > 0) {
5027     char* p;
5028     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5029       p = skip_over_field_signature(bytes, false, length, CHECK);
5030       legal = (p != NULL) && ((p - bytes) == (int)length);
5031     } else if (_major_version < JAVA_1_5_VERSION) {
5032       if (bytes[0] != '<') {
5033         p = skip_over_field_name(bytes, true, length);
5034         legal = (p != NULL) && ((p - bytes) == (int)length);
5035       }
5036     } else {
5037       // 4900761: relax the constraints based on JSR202 spec
5038       // Class names may be drawn from the entire Unicode character set.
5039       // Identifiers between '/' must be unqualified names.
5040       // The utf8 string has been verified when parsing cpool entries.
5041       legal = verify_unqualified_name(bytes, length, LegalClass);
5042     }
5043   }
5044   if (!legal) {
5045     ResourceMark rm(THREAD);
5046     Exceptions::fthrow(
5047       THREAD_AND_LOCATION,
5048       vmSymbols::java_lang_ClassFormatError(),
5049       "Illegal class name \"%s\" in class file %s", bytes,
5050       _class_name->as_C_string()
5051     );
5052     return;
5053   }
5054 }
5055 
5056 // Checks if name is a legal field name.
5057 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
5058   if (!_need_verify || _relax_verify) { return; }
5059 
5060   char buf[fixed_buffer_size];
5061   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5062   unsigned int length = name->utf8_length();
5063   bool legal = false;
5064 
5065   if (length > 0) {
5066     if (_major_version < JAVA_1_5_VERSION) {
5067       if (bytes[0] != '<') {
5068         char* p = skip_over_field_name(bytes, false, length);
5069         legal = (p != NULL) && ((p - bytes) == (int)length);
5070       }
5071     } else {
5072       // 4881221: relax the constraints based on JSR202 spec
5073       legal = verify_unqualified_name(bytes, length, LegalField);
5074     }
5075   }
5076 
5077   if (!legal) {
5078     ResourceMark rm(THREAD);
5079     Exceptions::fthrow(
5080       THREAD_AND_LOCATION,
5081       vmSymbols::java_lang_ClassFormatError(),
5082       "Illegal field name \"%s\" in class %s", bytes,
5083       _class_name->as_C_string()
5084     );
5085     return;
5086   }
5087 }
5088 
5089 // Checks if name is a legal method name.
5090 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5091   if (!_need_verify || _relax_verify) { return; }
5092 
5093   assert(name != NULL, "method name is null");
5094   char buf[fixed_buffer_size];
5095   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5096   unsigned int length = name->utf8_length();
5097   bool legal = false;
5098 
5099   if (length > 0) {
5100     if (bytes[0] == '<') {
5101       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5102         legal = true;
5103       }
5104     } else if (_major_version < JAVA_1_5_VERSION) {
5105       char* p;
5106       p = skip_over_field_name(bytes, false, length);
5107       legal = (p != NULL) && ((p - bytes) == (int)length);
5108     } else {
5109       // 4881221: relax the constraints based on JSR202 spec
5110       legal = verify_unqualified_name(bytes, length, LegalMethod);
5111     }
5112   }
5113 
5114   if (!legal) {
5115     ResourceMark rm(THREAD);
5116     Exceptions::fthrow(
5117       THREAD_AND_LOCATION,
5118       vmSymbols::java_lang_ClassFormatError(),
5119       "Illegal method name \"%s\" in class %s", bytes,
5120       _class_name->as_C_string()
5121     );
5122     return;
5123   }
5124 }
5125 
5126 
5127 // Checks if signature is a legal field signature.
5128 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5129   if (!_need_verify) { return; }
5130 
5131   char buf[fixed_buffer_size];
5132   char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5133   unsigned int length = signature->utf8_length();
5134   char* p = skip_over_field_signature(bytes, false, length, CHECK);
5135 
5136   if (p == NULL || (p - bytes) != (int)length) {
5137     throwIllegalSignature("Field", name, signature, CHECK);
5138   }
5139 }
5140 
5141 // Checks if signature is a legal method signature.
5142 // Returns number of parameters
5143 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5144   if (!_need_verify) {
5145     // make sure caller's args_size will be less than 0 even for non-static
5146     // method so it will be recomputed in compute_size_of_parameters().
5147     return -2;
5148   }
5149 
5150   unsigned int args_size = 0;
5151   char buf[fixed_buffer_size];
5152   char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5153   unsigned int length = signature->utf8_length();
5154   char* nextp;
5155 
5156   // The first character must be a '('
5157   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5158     length--;
5159     // Skip over legal field signatures
5160     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5161     while ((length > 0) && (nextp != NULL)) {
5162       args_size++;
5163       if (p[0] == 'J' || p[0] == 'D') {
5164         args_size++;
5165       }
5166       length -= nextp - p;
5167       p = nextp;
5168       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5169     }
5170     // The first non-signature thing better be a ')'
5171     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5172       length--;
5173       if (name == vmSymbols::object_initializer_name()) {
5174         // All "<init>" methods must return void
5175         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5176           return args_size;
5177         }
5178       } else {
5179         // Now we better just have a return value
5180         nextp = skip_over_field_signature(p, true, length, CHECK_0);
5181         if (nextp && ((int)length == (nextp - p))) {
5182           return args_size;
5183         }
5184       }
5185     }
5186   }
5187   // Report error
5188   throwIllegalSignature("Method", name, signature, CHECK_0);
5189   return 0;
5190 }
5191 
5192 
5193 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5194 // Method names also may not contain the characters '<' or '>', unless <init>
5195 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
5196 // method.  Because these names have been checked as special cases before
5197 // calling this method in verify_legal_method_name.
5198 bool ClassFileParser::verify_unqualified_name(
5199     char* name, unsigned int length, int type) {
5200   jchar ch;
5201 
5202   for (char* p = name; p != name + length; ) {
5203     ch = *p;
5204     if (ch < 128) {
5205       p++;
5206       if (ch == '.' || ch == ';' || ch == '[' ) {
5207         return false;   // do not permit '.', ';', or '['
5208       }
5209       if (type != LegalClass && ch == '/') {
5210         return false;   // do not permit '/' unless it's class name
5211       }
5212       if (type == LegalMethod && (ch == '<' || ch == '>')) {
5213         return false;   // do not permit '<' or '>' in method names
5214       }
5215     } else {
5216       char* tmp_p = UTF8::next(p, &ch);
5217       p = tmp_p;
5218     }
5219   }
5220   return true;
5221 }
5222 
5223 
5224 // Take pointer to a string. Skip over the longest part of the string that could
5225 // be taken as a fieldname. Allow '/' if slash_ok is true.
5226 // Return a pointer to just past the fieldname.
5227 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5228 // being true, we saw consecutive slashes (meaning we were looking for a
5229 // qualified path but found something that was badly-formed).
5230 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5231   char* p;
5232   jchar ch;
5233   jboolean last_is_slash = false;
5234   jboolean not_first_ch = false;
5235 
5236   for (p = name; p != name + length; not_first_ch = true) {
5237     char* old_p = p;
5238     ch = *p;
5239     if (ch < 128) {
5240       p++;
5241       // quick check for ascii
5242       if ((ch >= 'a' && ch <= 'z') ||
5243           (ch >= 'A' && ch <= 'Z') ||
5244           (ch == '_' || ch == '$') ||
5245           (not_first_ch && ch >= '0' && ch <= '9')) {
5246         last_is_slash = false;
5247         continue;
5248       }
5249       if (slash_ok && ch == '/') {
5250         if (last_is_slash) {
5251           return NULL;  // Don't permit consecutive slashes
5252         }
5253         last_is_slash = true;
5254         continue;
5255       }
5256     } else {
5257       jint unicode_ch;
5258       char* tmp_p = UTF8::next_character(p, &unicode_ch);
5259       p = tmp_p;
5260       last_is_slash = false;
5261       // Check if ch is Java identifier start or is Java identifier part
5262       // 4672820: call java.lang.Character methods directly without generating separate tables.
5263       EXCEPTION_MARK;
5264       instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5265 
5266       // return value
5267       JavaValue result(T_BOOLEAN);
5268       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5269       JavaCallArguments args;
5270       args.push_int(unicode_ch);
5271 
5272       // public static boolean isJavaIdentifierStart(char ch);
5273       JavaCalls::call_static(&result,
5274                              klass,
5275                              vmSymbols::isJavaIdentifierStart_name(),
5276                              vmSymbols::int_bool_signature(),
5277                              &args,
5278                              THREAD);
5279 
5280       if (HAS_PENDING_EXCEPTION) {
5281         CLEAR_PENDING_EXCEPTION;
5282         return 0;
5283       }
5284       if (result.get_jboolean()) {
5285         continue;
5286       }
5287 
5288       if (not_first_ch) {
5289         // public static boolean isJavaIdentifierPart(char ch);
5290         JavaCalls::call_static(&result,
5291                                klass,
5292                                vmSymbols::isJavaIdentifierPart_name(),
5293                                vmSymbols::int_bool_signature(),
5294                                &args,
5295                                THREAD);
5296 
5297         if (HAS_PENDING_EXCEPTION) {
5298           CLEAR_PENDING_EXCEPTION;
5299           return 0;
5300         }
5301 
5302         if (result.get_jboolean()) {
5303           continue;
5304         }
5305       }
5306     }
5307     return (not_first_ch) ? old_p : NULL;
5308   }
5309   return (not_first_ch) ? p : NULL;
5310 }
5311 
5312 
5313 // Take pointer to a string. Skip over the longest part of the string that could
5314 // be taken as a field signature. Allow "void" if void_ok.
5315 // Return a pointer to just past the signature.
5316 // Return NULL if no legal signature is found.
5317 char* ClassFileParser::skip_over_field_signature(char* signature,
5318                                                  bool void_ok,
5319                                                  unsigned int length,
5320                                                  TRAPS) {
5321   unsigned int array_dim = 0;
5322   while (length > 0) {
5323     switch (signature[0]) {
5324       case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5325       case JVM_SIGNATURE_BOOLEAN:
5326       case JVM_SIGNATURE_BYTE:
5327       case JVM_SIGNATURE_CHAR:
5328       case JVM_SIGNATURE_SHORT:
5329       case JVM_SIGNATURE_INT:
5330       case JVM_SIGNATURE_FLOAT:
5331       case JVM_SIGNATURE_LONG:
5332       case JVM_SIGNATURE_DOUBLE:
5333         return signature + 1;
5334       case JVM_SIGNATURE_CLASS: {
5335         if (_major_version < JAVA_1_5_VERSION) {
5336           // Skip over the class name if one is there
5337           char* p = skip_over_field_name(signature + 1, true, --length);
5338 
5339           // The next character better be a semicolon
5340           if (p && (p - signature) > 1 && p[0] == ';') {
5341             return p + 1;
5342           }
5343         } else {
5344           // 4900761: For class version > 48, any unicode is allowed in class name.
5345           length--;
5346           signature++;
5347           while (length > 0 && signature[0] != ';') {
5348             if (signature[0] == '.') {
5349               classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5350             }
5351             length--;
5352             signature++;
5353           }
5354           if (signature[0] == ';') { return signature + 1; }
5355         }
5356 
5357         return NULL;
5358       }
5359       case JVM_SIGNATURE_ARRAY:
5360         array_dim++;
5361         if (array_dim > 255) {
5362           // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5363           classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5364         }
5365         // The rest of what's there better be a legal signature
5366         signature++;
5367         length--;
5368         void_ok = false;
5369         break;
5370 
5371       default:
5372         return NULL;
5373     }
5374   }
5375   return NULL;
5376 }