1 /*
   2  * Copyright (c) 1997, 2013, 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.hpp"
  29 #include "classfile/classLoaderData.inline.hpp"
  30 #include "classfile/defaultMethods.hpp"
  31 #include "classfile/javaClasses.hpp"
  32 #include "classfile/symbolTable.hpp"
  33 #include "classfile/systemDictionary.hpp"
  34 #include "classfile/verificationType.hpp"
  35 #include "classfile/verifier.hpp"
  36 #include "classfile/vmSymbols.hpp"
  37 #include "memory/allocation.hpp"
  38 #include "memory/gcLocker.hpp"
  39 #include "memory/metadataFactory.hpp"
  40 #include "memory/oopFactory.hpp"
  41 #include "memory/referenceType.hpp"
  42 #include "memory/universe.inline.hpp"
  43 #include "oops/constantPool.hpp"
  44 #include "oops/fieldStreams.hpp"
  45 #include "oops/instanceKlass.hpp"
  46 #include "oops/instanceMirrorKlass.hpp"
  47 #include "oops/klass.inline.hpp"
  48 #include "oops/klassVtable.hpp"
  49 #include "oops/method.hpp"
  50 #include "oops/symbol.hpp"
  51 #include "prims/jvm.h"
  52 #include "prims/jvmtiExport.hpp"
  53 #include "prims/jvmtiThreadState.hpp"
  54 #include "runtime/javaCalls.hpp"
  55 #include "runtime/perfData.hpp"
  56 #include "runtime/reflection.hpp"
  57 #include "runtime/signature.hpp"
  58 #include "runtime/timer.hpp"
  59 #include "services/classLoadingService.hpp"
  60 #include "services/threadService.hpp"
  61 #include "utilities/array.hpp"
  62 #include "utilities/globalDefinitions.hpp"
  63 
  64 // We generally try to create the oops directly when parsing, rather than
  65 // allocating temporary data structures and copying the bytes twice. A
  66 // temporary area is only needed when parsing utf8 entries in the constant
  67 // pool and when parsing line number tables.
  68 
  69 // We add assert in debug mode when class format is not checked.
  70 
  71 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
  72 #define JAVA_MIN_SUPPORTED_VERSION        45
  73 #define JAVA_MAX_SUPPORTED_VERSION        52
  74 #define JAVA_MAX_SUPPORTED_MINOR_VERSION  0
  75 
  76 // Used for two backward compatibility reasons:
  77 // - to check for new additions to the class file format in JDK1.5
  78 // - to check for bug fixes in the format checker in JDK1.5
  79 #define JAVA_1_5_VERSION                  49
  80 
  81 // Used for backward compatibility reasons:
  82 // - to check for javac bug fixes that happened after 1.5
  83 // - also used as the max version when running in jdk6
  84 #define JAVA_6_VERSION                    50
  85 
  86 // Used for backward compatibility reasons:
  87 // - to check NameAndType_info signatures more aggressively
  88 #define JAVA_7_VERSION                    51
  89 
  90 // Extension method support.
  91 #define JAVA_8_VERSION                    52
  92 
  93 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
  94   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
  95   // this function (_current can be allocated in a register, with scalar
  96   // replacement of aggregates). The _current pointer is copied back to
  97   // stream() when this function returns. DON'T call another method within
  98   // this method that uses stream().
  99   ClassFileStream* cfs0 = stream();
 100   ClassFileStream cfs1 = *cfs0;
 101   ClassFileStream* cfs = &cfs1;
 102 #ifdef ASSERT
 103   assert(cfs->allocated_on_stack(),"should be local");
 104   u1* old_current = cfs0->current();
 105 #endif
 106   Handle class_loader(THREAD, _loader_data->class_loader());
 107 
 108   // Used for batching symbol allocations.
 109   const char* names[SymbolTable::symbol_alloc_batch_size];
 110   int lengths[SymbolTable::symbol_alloc_batch_size];
 111   int indices[SymbolTable::symbol_alloc_batch_size];
 112   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 113   int names_count = 0;
 114 
 115   // parsing  Index 0 is unused
 116   for (int index = 1; index < length; index++) {
 117     // Each of the following case guarantees one more byte in the stream
 118     // for the following tag or the access_flags following constant pool,
 119     // so we don't need bounds-check for reading tag.
 120     u1 tag = cfs->get_u1_fast();
 121     switch (tag) {
 122       case JVM_CONSTANT_Class :
 123         {
 124           cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 125           u2 name_index = cfs->get_u2_fast();
 126           _cp->klass_index_at_put(index, name_index);
 127         }
 128         break;
 129       case JVM_CONSTANT_Fieldref :
 130         {
 131           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 132           u2 class_index = cfs->get_u2_fast();
 133           u2 name_and_type_index = cfs->get_u2_fast();
 134           _cp->field_at_put(index, class_index, name_and_type_index);
 135         }
 136         break;
 137       case JVM_CONSTANT_Methodref :
 138         {
 139           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 140           u2 class_index = cfs->get_u2_fast();
 141           u2 name_and_type_index = cfs->get_u2_fast();
 142           _cp->method_at_put(index, class_index, name_and_type_index);
 143         }
 144         break;
 145       case JVM_CONSTANT_InterfaceMethodref :
 146         {
 147           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 148           u2 class_index = cfs->get_u2_fast();
 149           u2 name_and_type_index = cfs->get_u2_fast();
 150           _cp->interface_method_at_put(index, class_index, name_and_type_index);
 151         }
 152         break;
 153       case JVM_CONSTANT_String :
 154         {
 155           cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 156           u2 string_index = cfs->get_u2_fast();
 157           _cp->string_index_at_put(index, string_index);
 158         }
 159         break;
 160       case JVM_CONSTANT_MethodHandle :
 161       case JVM_CONSTANT_MethodType :
 162         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 163           classfile_parse_error(
 164             "Class file version does not support constant tag %u in class file %s",
 165             tag, CHECK);
 166         }
 167         if (!EnableInvokeDynamic) {
 168           classfile_parse_error(
 169             "This JVM does not support constant tag %u in class file %s",
 170             tag, CHECK);
 171         }
 172         if (tag == JVM_CONSTANT_MethodHandle) {
 173           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 174           u1 ref_kind = cfs->get_u1_fast();
 175           u2 method_index = cfs->get_u2_fast();
 176           _cp->method_handle_index_at_put(index, ref_kind, method_index);
 177         } else if (tag == JVM_CONSTANT_MethodType) {
 178           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 179           u2 signature_index = cfs->get_u2_fast();
 180           _cp->method_type_index_at_put(index, signature_index);
 181         } else {
 182           ShouldNotReachHere();
 183         }
 184         break;
 185       case JVM_CONSTANT_InvokeDynamic :
 186         {
 187           if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 188             classfile_parse_error(
 189               "Class file version does not support constant tag %u in class file %s",
 190               tag, CHECK);
 191           }
 192           if (!EnableInvokeDynamic) {
 193             classfile_parse_error(
 194               "This JVM does not support constant tag %u in class file %s",
 195               tag, CHECK);
 196           }
 197           cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 198           u2 bootstrap_specifier_index = cfs->get_u2_fast();
 199           u2 name_and_type_index = cfs->get_u2_fast();
 200           if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
 201             _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 202           _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 203         }
 204         break;
 205       case JVM_CONSTANT_Integer :
 206         {
 207           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 208           u4 bytes = cfs->get_u4_fast();
 209           _cp->int_at_put(index, (jint) bytes);
 210         }
 211         break;
 212       case JVM_CONSTANT_Float :
 213         {
 214           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 215           u4 bytes = cfs->get_u4_fast();
 216           _cp->float_at_put(index, *(jfloat*)&bytes);
 217         }
 218         break;
 219       case JVM_CONSTANT_Long :
 220         // A mangled type might cause you to overrun allocated memory
 221         guarantee_property(index+1 < length,
 222                            "Invalid constant pool entry %u in class file %s",
 223                            index, CHECK);
 224         {
 225           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 226           u8 bytes = cfs->get_u8_fast();
 227           _cp->long_at_put(index, bytes);
 228         }
 229         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 230         break;
 231       case JVM_CONSTANT_Double :
 232         // A mangled type might cause you to overrun allocated memory
 233         guarantee_property(index+1 < length,
 234                            "Invalid constant pool entry %u in class file %s",
 235                            index, CHECK);
 236         {
 237           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 238           u8 bytes = cfs->get_u8_fast();
 239           _cp->double_at_put(index, *(jdouble*)&bytes);
 240         }
 241         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 242         break;
 243       case JVM_CONSTANT_NameAndType :
 244         {
 245           cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 246           u2 name_index = cfs->get_u2_fast();
 247           u2 signature_index = cfs->get_u2_fast();
 248           _cp->name_and_type_at_put(index, name_index, signature_index);
 249         }
 250         break;
 251       case JVM_CONSTANT_Utf8 :
 252         {
 253           cfs->guarantee_more(2, CHECK);  // utf8_length
 254           u2  utf8_length = cfs->get_u2_fast();
 255           u1* utf8_buffer = cfs->get_u1_buffer();
 256           assert(utf8_buffer != NULL, "null utf8 buffer");
 257           // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 258           cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 259           cfs->skip_u1_fast(utf8_length);
 260 
 261           // Before storing the symbol, make sure it's legal
 262           if (_need_verify) {
 263             verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
 264           }
 265 
 266           if (EnableInvokeDynamic && has_cp_patch_at(index)) {
 267             Handle patch = clear_cp_patch_at(index);
 268             guarantee_property(java_lang_String::is_instance(patch()),
 269                                "Illegal utf8 patch at %d in class file %s",
 270                                index, CHECK);
 271             char* str = java_lang_String::as_utf8_string(patch());
 272             // (could use java_lang_String::as_symbol instead, but might as well batch them)
 273             utf8_buffer = (u1*) str;
 274             utf8_length = (int) strlen(str);
 275           }
 276 
 277           unsigned int hash;
 278           Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
 279           if (result == NULL) {
 280             names[names_count] = (char*)utf8_buffer;
 281             lengths[names_count] = utf8_length;
 282             indices[names_count] = index;
 283             hashValues[names_count++] = hash;
 284             if (names_count == SymbolTable::symbol_alloc_batch_size) {
 285               SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
 286               names_count = 0;
 287             }
 288           } else {
 289             _cp->symbol_at_put(index, result);
 290           }
 291         }
 292         break;
 293       default:
 294         classfile_parse_error(
 295           "Unknown constant tag %u in class file %s", tag, CHECK);
 296         break;
 297     }
 298   }
 299 
 300   // Allocate the remaining symbols
 301   if (names_count > 0) {
 302     SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
 303   }
 304 
 305   // Copy _current pointer of local copy back to stream().
 306 #ifdef ASSERT
 307   assert(cfs0->current() == old_current, "non-exclusive use of stream()");
 308 #endif
 309   cfs0->set_current(cfs1.current());
 310 }
 311 
 312 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
 313 
 314 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
 315   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
 316     return cp->symbol_at(index);
 317   else
 318     return NULL;
 319 }
 320 
 321 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
 322   ClassFileStream* cfs = stream();
 323   constantPoolHandle nullHandle;
 324 
 325   cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
 326   u2 length = cfs->get_u2_fast();
 327   guarantee_property(
 328     length >= 1, "Illegal constant pool size %u in class file %s",
 329     length, CHECK_(nullHandle));
 330   ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
 331                                                         CHECK_(nullHandle));
 332   _cp = constant_pool; // save in case of errors
 333   constantPoolHandle cp (THREAD, constant_pool);
 334 
 335   // parsing constant pool entries
 336   parse_constant_pool_entries(length, CHECK_(nullHandle));
 337 
 338   int index = 1;  // declared outside of loops for portability
 339 
 340   // first verification pass - validate cross references and fixup class and string constants
 341   for (index = 1; index < length; index++) {          // Index 0 is unused
 342     jbyte tag = cp->tag_at(index).value();
 343     switch (tag) {
 344       case JVM_CONSTANT_Class :
 345         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 346         break;
 347       case JVM_CONSTANT_Fieldref :
 348         // fall through
 349       case JVM_CONSTANT_Methodref :
 350         // fall through
 351       case JVM_CONSTANT_InterfaceMethodref : {
 352         if (!_need_verify) break;
 353         int klass_ref_index = cp->klass_ref_index_at(index);
 354         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 355         check_property(valid_klass_reference_at(klass_ref_index),
 356                        "Invalid constant pool index %u in class file %s",
 357                        klass_ref_index,
 358                        CHECK_(nullHandle));
 359         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 360                        cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 361                        "Invalid constant pool index %u in class file %s",
 362                        name_and_type_ref_index,
 363                        CHECK_(nullHandle));
 364         break;
 365       }
 366       case JVM_CONSTANT_String :
 367         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 368         break;
 369       case JVM_CONSTANT_Integer :
 370         break;
 371       case JVM_CONSTANT_Float :
 372         break;
 373       case JVM_CONSTANT_Long :
 374       case JVM_CONSTANT_Double :
 375         index++;
 376         check_property(
 377           (index < length && cp->tag_at(index).is_invalid()),
 378           "Improper constant pool long/double index %u in class file %s",
 379           index, CHECK_(nullHandle));
 380         break;
 381       case JVM_CONSTANT_NameAndType : {
 382         if (!_need_verify) break;
 383         int name_ref_index = cp->name_ref_index_at(index);
 384         int signature_ref_index = cp->signature_ref_index_at(index);
 385         check_property(valid_symbol_at(name_ref_index),
 386                  "Invalid constant pool index %u in class file %s",
 387                  name_ref_index, CHECK_(nullHandle));
 388         check_property(valid_symbol_at(signature_ref_index),
 389                  "Invalid constant pool index %u in class file %s",
 390                  signature_ref_index, CHECK_(nullHandle));
 391         break;
 392       }
 393       case JVM_CONSTANT_Utf8 :
 394         break;
 395       case JVM_CONSTANT_UnresolvedClass :         // fall-through
 396       case JVM_CONSTANT_UnresolvedClassInError:
 397         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 398         break;
 399       case JVM_CONSTANT_ClassIndex :
 400         {
 401           int class_index = cp->klass_index_at(index);
 402           check_property(valid_symbol_at(class_index),
 403                  "Invalid constant pool index %u in class file %s",
 404                  class_index, CHECK_(nullHandle));
 405           cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
 406         }
 407         break;
 408       case JVM_CONSTANT_StringIndex :
 409         {
 410           int string_index = cp->string_index_at(index);
 411           check_property(valid_symbol_at(string_index),
 412                  "Invalid constant pool index %u in class file %s",
 413                  string_index, CHECK_(nullHandle));
 414           Symbol* sym = cp->symbol_at(string_index);
 415           cp->unresolved_string_at_put(index, sym);
 416         }
 417         break;
 418       case JVM_CONSTANT_MethodHandle :
 419         {
 420           int ref_index = cp->method_handle_index_at(index);
 421           check_property(
 422             valid_cp_range(ref_index, length) &&
 423                 EnableInvokeDynamic,
 424               "Invalid constant pool index %u in class file %s",
 425               ref_index, CHECK_(nullHandle));
 426           constantTag tag = cp->tag_at(ref_index);
 427           int ref_kind  = cp->method_handle_ref_kind_at(index);
 428           switch (ref_kind) {
 429           case JVM_REF_getField:
 430           case JVM_REF_getStatic:
 431           case JVM_REF_putField:
 432           case JVM_REF_putStatic:
 433             check_property(
 434               tag.is_field(),
 435               "Invalid constant pool index %u in class file %s (not a field)",
 436               ref_index, CHECK_(nullHandle));
 437             break;
 438           case JVM_REF_invokeVirtual:
 439           case JVM_REF_newInvokeSpecial:
 440             check_property(
 441               tag.is_method(),
 442               "Invalid constant pool index %u in class file %s (not a method)",
 443               ref_index, CHECK_(nullHandle));
 444             break;
 445           case JVM_REF_invokeStatic:
 446           case JVM_REF_invokeSpecial:
 447             check_property(tag.is_method() ||
 448                            ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 449                "Invalid constant pool index %u in class file %s (not a method)",
 450                ref_index, CHECK_(nullHandle));
 451              break;
 452           case JVM_REF_invokeInterface:
 453             check_property(
 454               tag.is_interface_method(),
 455               "Invalid constant pool index %u in class file %s (not an interface method)",
 456               ref_index, CHECK_(nullHandle));
 457             break;
 458           default:
 459             classfile_parse_error(
 460               "Bad method handle kind at constant pool index %u in class file %s",
 461               index, CHECK_(nullHandle));
 462           }
 463           // Keep the ref_index unchanged.  It will be indirected at link-time.
 464         }
 465         break;
 466       case JVM_CONSTANT_MethodType :
 467         {
 468           int ref_index = cp->method_type_index_at(index);
 469           check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic,
 470                  "Invalid constant pool index %u in class file %s",
 471                  ref_index, CHECK_(nullHandle));
 472         }
 473         break;
 474       case JVM_CONSTANT_InvokeDynamic :
 475         {
 476           int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
 477           check_property(valid_cp_range(name_and_type_ref_index, length) &&
 478                          cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 479                          "Invalid constant pool index %u in class file %s",
 480                          name_and_type_ref_index,
 481                          CHECK_(nullHandle));
 482           // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
 483           break;
 484         }
 485       default:
 486         fatal(err_msg("bad constant pool tag value %u",
 487                       cp->tag_at(index).value()));
 488         ShouldNotReachHere();
 489         break;
 490     } // end of switch
 491   } // end of for
 492 
 493   if (_cp_patches != NULL) {
 494     // need to treat this_class specially...
 495     assert(EnableInvokeDynamic, "");
 496     int this_class_index;
 497     {
 498       cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
 499       u1* mark = cfs->current();
 500       u2 flags         = cfs->get_u2_fast();
 501       this_class_index = cfs->get_u2_fast();
 502       cfs->set_current(mark);  // revert to mark
 503     }
 504 
 505     for (index = 1; index < length; index++) {          // Index 0 is unused
 506       if (has_cp_patch_at(index)) {
 507         guarantee_property(index != this_class_index,
 508                            "Illegal constant pool patch to self at %d in class file %s",
 509                            index, CHECK_(nullHandle));
 510         patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
 511       }
 512     }
 513   }
 514 
 515   if (!_need_verify) {
 516     return cp;
 517   }
 518 
 519   // second verification pass - checks the strings are of the right format.
 520   // but not yet to the other entries
 521   for (index = 1; index < length; index++) {
 522     jbyte tag = cp->tag_at(index).value();
 523     switch (tag) {
 524       case JVM_CONSTANT_UnresolvedClass: {
 525         Symbol*  class_name = cp->unresolved_klass_at(index);
 526         // check the name, even if _cp_patches will overwrite it
 527         verify_legal_class_name(class_name, CHECK_(nullHandle));
 528         break;
 529       }
 530       case JVM_CONSTANT_NameAndType: {
 531         if (_need_verify && _major_version >= JAVA_7_VERSION) {
 532           int sig_index = cp->signature_ref_index_at(index);
 533           int name_index = cp->name_ref_index_at(index);
 534           Symbol*  name = cp->symbol_at(name_index);
 535           Symbol*  sig = cp->symbol_at(sig_index);
 536           if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
 537             verify_legal_method_signature(name, sig, CHECK_(nullHandle));
 538           } else {
 539             verify_legal_field_signature(name, sig, CHECK_(nullHandle));
 540           }
 541         }
 542         break;
 543       }
 544       case JVM_CONSTANT_InvokeDynamic:
 545       case JVM_CONSTANT_Fieldref:
 546       case JVM_CONSTANT_Methodref:
 547       case JVM_CONSTANT_InterfaceMethodref: {
 548         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 549         // already verified to be utf8
 550         int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 551         // already verified to be utf8
 552         int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
 553         Symbol*  name = cp->symbol_at(name_ref_index);
 554         Symbol*  signature = cp->symbol_at(signature_ref_index);
 555         if (tag == JVM_CONSTANT_Fieldref) {
 556           verify_legal_field_name(name, CHECK_(nullHandle));
 557           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 558             // Signature is verified above, when iterating NameAndType_info.
 559             // Need only to be sure it's the right type.
 560             if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
 561               throwIllegalSignature(
 562                   "Field", name, signature, CHECK_(nullHandle));
 563             }
 564           } else {
 565             verify_legal_field_signature(name, signature, CHECK_(nullHandle));
 566           }
 567         } else {
 568           verify_legal_method_name(name, CHECK_(nullHandle));
 569           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 570             // Signature is verified above, when iterating NameAndType_info.
 571             // Need only to be sure it's the right type.
 572             if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
 573               throwIllegalSignature(
 574                   "Method", name, signature, CHECK_(nullHandle));
 575             }
 576           } else {
 577             verify_legal_method_signature(name, signature, CHECK_(nullHandle));
 578           }
 579           if (tag == JVM_CONSTANT_Methodref) {
 580             // 4509014: If a class method name begins with '<', it must be "<init>".
 581             assert(name != NULL, "method name in constant pool is null");
 582             unsigned int name_len = name->utf8_length();
 583             assert(name_len > 0, "bad method name");  // already verified as legal name
 584             if (name->byte_at(0) == '<') {
 585               if (name != vmSymbols::object_initializer_name()) {
 586                 classfile_parse_error(
 587                   "Bad method name at constant pool index %u in class file %s",
 588                   name_ref_index, CHECK_(nullHandle));
 589               }
 590             }
 591           }
 592         }
 593         break;
 594       }
 595       case JVM_CONSTANT_MethodHandle: {
 596         int ref_index = cp->method_handle_index_at(index);
 597         int ref_kind  = cp->method_handle_ref_kind_at(index);
 598         switch (ref_kind) {
 599         case JVM_REF_invokeVirtual:
 600         case JVM_REF_invokeStatic:
 601         case JVM_REF_invokeSpecial:
 602         case JVM_REF_newInvokeSpecial:
 603           {
 604             int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
 605             int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 606             Symbol*  name = cp->symbol_at(name_ref_index);
 607             if (ref_kind == JVM_REF_newInvokeSpecial) {
 608               if (name != vmSymbols::object_initializer_name()) {
 609                 classfile_parse_error(
 610                   "Bad constructor name at constant pool index %u in class file %s",
 611                   name_ref_index, CHECK_(nullHandle));
 612               }
 613             } else {
 614               if (name == vmSymbols::object_initializer_name()) {
 615                 classfile_parse_error(
 616                   "Bad method name at constant pool index %u in class file %s",
 617                   name_ref_index, CHECK_(nullHandle));
 618               }
 619             }
 620           }
 621           break;
 622           // Other ref_kinds are already fully checked in previous pass.
 623         }
 624         break;
 625       }
 626       case JVM_CONSTANT_MethodType: {
 627         Symbol* no_name = vmSymbols::type_name(); // place holder
 628         Symbol*  signature = cp->method_type_signature_at(index);
 629         verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
 630         break;
 631       }
 632       case JVM_CONSTANT_Utf8: {
 633         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 634       }
 635     }  // end of switch
 636   }  // end of for
 637 
 638   return cp;
 639 }
 640 
 641 
 642 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) {
 643   assert(EnableInvokeDynamic, "");
 644   BasicType patch_type = T_VOID;
 645 
 646   switch (cp->tag_at(index).value()) {
 647 
 648   case JVM_CONSTANT_UnresolvedClass :
 649     // Patching a class means pre-resolving it.
 650     // The name in the constant pool is ignored.
 651     if (java_lang_Class::is_instance(patch())) {
 652       guarantee_property(!java_lang_Class::is_primitive(patch()),
 653                          "Illegal class patch at %d in class file %s",
 654                          index, CHECK);
 655       cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
 656     } else {
 657       guarantee_property(java_lang_String::is_instance(patch()),
 658                          "Illegal class patch at %d in class file %s",
 659                          index, CHECK);
 660       Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
 661       cp->unresolved_klass_at_put(index, name);
 662     }
 663     break;
 664 
 665   case JVM_CONSTANT_String :
 666     // skip this patch and don't clear it.  Needs the oop array for resolved
 667     // references to be created first.
 668     return;
 669 
 670   case JVM_CONSTANT_Integer : patch_type = T_INT;    goto patch_prim;
 671   case JVM_CONSTANT_Float :   patch_type = T_FLOAT;  goto patch_prim;
 672   case JVM_CONSTANT_Long :    patch_type = T_LONG;   goto patch_prim;
 673   case JVM_CONSTANT_Double :  patch_type = T_DOUBLE; goto patch_prim;
 674   patch_prim:
 675     {
 676       jvalue value;
 677       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 678       guarantee_property(value_type == patch_type,
 679                          "Illegal primitive patch at %d in class file %s",
 680                          index, CHECK);
 681       switch (value_type) {
 682       case T_INT:    cp->int_at_put(index,   value.i); break;
 683       case T_FLOAT:  cp->float_at_put(index, value.f); break;
 684       case T_LONG:   cp->long_at_put(index,  value.j); break;
 685       case T_DOUBLE: cp->double_at_put(index, value.d); break;
 686       default:       assert(false, "");
 687       }
 688     }
 689     break;
 690 
 691   default:
 692     // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 693     guarantee_property(!has_cp_patch_at(index),
 694                        "Illegal unexpected patch at %d in class file %s",
 695                        index, CHECK);
 696     return;
 697   }
 698 
 699   // On fall-through, mark the patch as used.
 700   clear_cp_patch_at(index);
 701 }
 702 
 703 
 704 
 705 class NameSigHash: public ResourceObj {
 706  public:
 707   Symbol*       _name;       // name
 708   Symbol*       _sig;        // signature
 709   NameSigHash*  _next;       // Next entry in hash table
 710 };
 711 
 712 
 713 #define HASH_ROW_SIZE 256
 714 
 715 unsigned int hash(Symbol* name, Symbol* sig) {
 716   unsigned int raw_hash = 0;
 717   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 718   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 719 
 720   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 721 }
 722 
 723 
 724 void initialize_hashtable(NameSigHash** table) {
 725   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 726 }
 727 
 728 // Return false if the name/sig combination is found in table.
 729 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 730 // The old format checker uses heap sort to find duplicates.
 731 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 732 // of table since we don't expect Symbol*'s to move.
 733 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
 734   assert(name != NULL, "name in constant pool is NULL");
 735 
 736   // First lookup for duplicates
 737   int index = hash(name, sig);
 738   NameSigHash* entry = table[index];
 739   while (entry != NULL) {
 740     if (entry->_name == name && entry->_sig == sig) {
 741       return false;
 742     }
 743     entry = entry->_next;
 744   }
 745 
 746   // No duplicate is found, allocate a new entry and fill it.
 747   entry = new NameSigHash();
 748   entry->_name = name;
 749   entry->_sig = sig;
 750 
 751   // Insert into hash table
 752   entry->_next = table[index];
 753   table[index] = entry;
 754 
 755   return true;
 756 }
 757 
 758 
 759 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
 760                                                  Handle protection_domain,
 761                                                  Symbol* class_name,
 762                                                  bool* has_default_methods,
 763                                                  TRAPS) {
 764   if (length == 0) {
 765     _local_interfaces = Universe::the_empty_klass_array();
 766   } else {
 767     ClassFileStream* cfs = stream();
 768     assert(length > 0, "only called for length>0");
 769     _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
 770 
 771     int index;
 772     for (index = 0; index < length; index++) {
 773       u2 interface_index = cfs->get_u2(CHECK_NULL);
 774       KlassHandle interf;
 775       check_property(
 776         valid_klass_reference_at(interface_index),
 777         "Interface name has bad constant pool index %u in class file %s",
 778         interface_index, CHECK_NULL);
 779       if (_cp->tag_at(interface_index).is_klass()) {
 780         interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
 781       } else {
 782         Symbol*  unresolved_klass  = _cp->klass_name_at(interface_index);
 783 
 784         // Don't need to check legal name because it's checked when parsing constant pool.
 785         // But need to make sure it's not an array type.
 786         guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 787                            "Bad interface name in class file %s", CHECK_NULL);
 788         Handle class_loader(THREAD, _loader_data->class_loader());
 789 
 790         // Call resolve_super so classcircularity is checked
 791         Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
 792                       unresolved_klass, class_loader, protection_domain,
 793                       false, CHECK_NULL);
 794         interf = KlassHandle(THREAD, k);
 795       }
 796 
 797       if (!interf()->is_interface()) {
 798         THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
 799       }
 800       if (InstanceKlass::cast(interf())->has_default_methods()) {
 801         *has_default_methods = true;
 802       }
 803       _local_interfaces->at_put(index, interf());
 804     }
 805 
 806     if (!_need_verify || length <= 1) {
 807       return _local_interfaces;
 808     }
 809 
 810     // Check if there's any duplicates in interfaces
 811     ResourceMark rm(THREAD);
 812     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
 813       THREAD, NameSigHash*, HASH_ROW_SIZE);
 814     initialize_hashtable(interface_names);
 815     bool dup = false;
 816     {
 817       debug_only(No_Safepoint_Verifier nsv;)
 818       for (index = 0; index < length; index++) {
 819         Klass* k = _local_interfaces->at(index);
 820         Symbol* name = InstanceKlass::cast(k)->name();
 821         // If no duplicates, add (name, NULL) in hashtable interface_names.
 822         if (!put_after_lookup(name, NULL, interface_names)) {
 823           dup = true;
 824           break;
 825         }
 826       }
 827     }
 828     if (dup) {
 829       classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
 830     }
 831   }
 832   return _local_interfaces;
 833 }
 834 
 835 
 836 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
 837   // Make sure the constant pool entry is of a type appropriate to this field
 838   guarantee_property(
 839     (constantvalue_index > 0 &&
 840       constantvalue_index < _cp->length()),
 841     "Bad initial value index %u in ConstantValue attribute in class file %s",
 842     constantvalue_index, CHECK);
 843   constantTag value_type = _cp->tag_at(constantvalue_index);
 844   switch ( _cp->basic_type_for_signature_at(signature_index) ) {
 845     case T_LONG:
 846       guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
 847       break;
 848     case T_FLOAT:
 849       guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
 850       break;
 851     case T_DOUBLE:
 852       guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
 853       break;
 854     case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
 855       guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
 856       break;
 857     case T_OBJECT:
 858       guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 859                          && value_type.is_string()),
 860                          "Bad string initial value in class file %s", CHECK);
 861       break;
 862     default:
 863       classfile_parse_error(
 864         "Unable to set initial value %u in class file %s",
 865         constantvalue_index, CHECK);
 866   }
 867 }
 868 
 869 
 870 // Parse attributes for a field.
 871 void ClassFileParser::parse_field_attributes(u2 attributes_count,
 872                                              bool is_static, u2 signature_index,
 873                                              u2* constantvalue_index_addr,
 874                                              bool* is_synthetic_addr,
 875                                              u2* generic_signature_index_addr,
 876                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
 877                                              TRAPS) {
 878   ClassFileStream* cfs = stream();
 879   assert(attributes_count > 0, "length should be greater than 0");
 880   u2 constantvalue_index = 0;
 881   u2 generic_signature_index = 0;
 882   bool is_synthetic = false;
 883   u1* runtime_visible_annotations = NULL;
 884   int runtime_visible_annotations_length = 0;
 885   u1* runtime_invisible_annotations = NULL;
 886   int runtime_invisible_annotations_length = 0;
 887   u1* runtime_visible_type_annotations = NULL;
 888   int runtime_visible_type_annotations_length = 0;
 889   u1* runtime_invisible_type_annotations = NULL;
 890   int runtime_invisible_type_annotations_length = 0;
 891   while (attributes_count--) {
 892     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
 893     u2 attribute_name_index = cfs->get_u2_fast();
 894     u4 attribute_length = cfs->get_u4_fast();
 895     check_property(valid_symbol_at(attribute_name_index),
 896                    "Invalid field attribute index %u in class file %s",
 897                    attribute_name_index,
 898                    CHECK);
 899     Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
 900     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
 901       // ignore if non-static
 902       if (constantvalue_index != 0) {
 903         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
 904       }
 905       check_property(
 906         attribute_length == 2,
 907         "Invalid ConstantValue field attribute length %u in class file %s",
 908         attribute_length, CHECK);
 909       constantvalue_index = cfs->get_u2(CHECK);
 910       if (_need_verify) {
 911         verify_constantvalue(constantvalue_index, signature_index, CHECK);
 912       }
 913     } else if (attribute_name == vmSymbols::tag_synthetic()) {
 914       if (attribute_length != 0) {
 915         classfile_parse_error(
 916           "Invalid Synthetic field attribute length %u in class file %s",
 917           attribute_length, CHECK);
 918       }
 919       is_synthetic = true;
 920     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
 921       if (attribute_length != 0) {
 922         classfile_parse_error(
 923           "Invalid Deprecated field attribute length %u in class file %s",
 924           attribute_length, CHECK);
 925       }
 926     } else if (_major_version >= JAVA_1_5_VERSION) {
 927       if (attribute_name == vmSymbols::tag_signature()) {
 928         if (attribute_length != 2) {
 929           classfile_parse_error(
 930             "Wrong size %u for field's Signature attribute in class file %s",
 931             attribute_length, CHECK);
 932         }
 933         generic_signature_index = cfs->get_u2(CHECK);
 934       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
 935         runtime_visible_annotations_length = attribute_length;
 936         runtime_visible_annotations = cfs->get_u1_buffer();
 937         assert(runtime_visible_annotations != NULL, "null visible annotations");
 938         parse_annotations(runtime_visible_annotations,
 939                           runtime_visible_annotations_length,
 940                           parsed_annotations,
 941                           CHECK);
 942         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
 943       } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
 944         runtime_invisible_annotations_length = attribute_length;
 945         runtime_invisible_annotations = cfs->get_u1_buffer();
 946         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
 947         cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
 948       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
 949         runtime_visible_type_annotations_length = attribute_length;
 950         runtime_visible_type_annotations = cfs->get_u1_buffer();
 951         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
 952         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
 953       } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
 954         runtime_invisible_type_annotations_length = attribute_length;
 955         runtime_invisible_type_annotations = cfs->get_u1_buffer();
 956         assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
 957         cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
 958       } else {
 959         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 960       }
 961     } else {
 962       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 963     }
 964   }
 965 
 966   *constantvalue_index_addr = constantvalue_index;
 967   *is_synthetic_addr = is_synthetic;
 968   *generic_signature_index_addr = generic_signature_index;
 969   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
 970                                             runtime_visible_annotations_length,
 971                                             runtime_invisible_annotations,
 972                                             runtime_invisible_annotations_length,
 973                                             CHECK);
 974   parsed_annotations->set_field_annotations(a);
 975   a = assemble_annotations(runtime_visible_type_annotations,
 976                            runtime_visible_type_annotations_length,
 977                            runtime_invisible_type_annotations,
 978                            runtime_invisible_type_annotations_length,
 979                            CHECK);
 980   parsed_annotations->set_field_type_annotations(a);
 981   return;
 982 }
 983 
 984 
 985 // Field allocation types. Used for computing field offsets.
 986 
 987 enum FieldAllocationType {
 988   STATIC_OOP,           // Oops
 989   STATIC_BYTE,          // Boolean, Byte, char
 990   STATIC_SHORT,         // shorts
 991   STATIC_WORD,          // ints
 992   STATIC_DOUBLE,        // aligned long or double
 993   NONSTATIC_OOP,
 994   NONSTATIC_BYTE,
 995   NONSTATIC_SHORT,
 996   NONSTATIC_WORD,
 997   NONSTATIC_DOUBLE,
 998   MAX_FIELD_ALLOCATION_TYPE,
 999   BAD_ALLOCATION_TYPE = -1
1000 };
1001 
1002 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1003   BAD_ALLOCATION_TYPE, // 0
1004   BAD_ALLOCATION_TYPE, // 1
1005   BAD_ALLOCATION_TYPE, // 2
1006   BAD_ALLOCATION_TYPE, // 3
1007   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1008   NONSTATIC_SHORT,     // T_CHAR        =  5,
1009   NONSTATIC_WORD,      // T_FLOAT       =  6,
1010   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1011   NONSTATIC_BYTE,      // T_BYTE        =  8,
1012   NONSTATIC_SHORT,     // T_SHORT       =  9,
1013   NONSTATIC_WORD,      // T_INT         = 10,
1014   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1015   NONSTATIC_OOP,       // T_OBJECT      = 12,
1016   NONSTATIC_OOP,       // T_ARRAY       = 13,
1017   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1018   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1019   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1020   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1021   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1022   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1023   BAD_ALLOCATION_TYPE, // 0
1024   BAD_ALLOCATION_TYPE, // 1
1025   BAD_ALLOCATION_TYPE, // 2
1026   BAD_ALLOCATION_TYPE, // 3
1027   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1028   STATIC_SHORT,        // T_CHAR        =  5,
1029   STATIC_WORD,         // T_FLOAT       =  6,
1030   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1031   STATIC_BYTE,         // T_BYTE        =  8,
1032   STATIC_SHORT,        // T_SHORT       =  9,
1033   STATIC_WORD,         // T_INT         = 10,
1034   STATIC_DOUBLE,       // T_LONG        = 11,
1035   STATIC_OOP,          // T_OBJECT      = 12,
1036   STATIC_OOP,          // T_ARRAY       = 13,
1037   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1038   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1039   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1040   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1041   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1042   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1043 };
1044 
1045 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1046   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1047   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1048   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1049   return result;
1050 }
1051 
1052 class FieldAllocationCount: public ResourceObj {
1053  public:
1054   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1055 
1056   FieldAllocationCount() {
1057     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1058       count[i] = 0;
1059     }
1060   }
1061 
1062   FieldAllocationType update(bool is_static, BasicType type) {
1063     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1064     // Make sure there is no overflow with injected fields.
1065     assert(count[atype] < 0xFFFF, "More than 65535 fields");
1066     count[atype]++;
1067     return atype;
1068   }
1069 };
1070 
1071 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1072                                          bool is_interface,
1073                                          FieldAllocationCount *fac,
1074                                          u2* java_fields_count_ptr, TRAPS) {
1075   ClassFileStream* cfs = stream();
1076   cfs->guarantee_more(2, CHECK_NULL);  // length
1077   u2 length = cfs->get_u2_fast();
1078   *java_fields_count_ptr = length;
1079 
1080   int num_injected = 0;
1081   InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1082   int total_fields = length + num_injected;
1083 
1084   // The field array starts with tuples of shorts
1085   // [access, name index, sig index, initial value index, byte offset].
1086   // A generic signature slot only exists for field with generic
1087   // signature attribute. And the access flag is set with
1088   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1089   // signature slots are at the end of the field array and after all
1090   // other fields data.
1091   //
1092   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1093   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1094   //       ...
1095   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1096   //       [generic signature index]
1097   //       [generic signature index]
1098   //       ...
1099   //
1100   // Allocate a temporary resource array for field data. For each field,
1101   // a slot is reserved in the temporary array for the generic signature
1102   // index. After parsing all fields, the data are copied to a permanent
1103   // array and any unused slots will be discarded.
1104   ResourceMark rm(THREAD);
1105   u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1106              THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1107 
1108   // The generic signature slots start after all other fields' data.
1109   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1110   int num_generic_signature = 0;
1111   for (int n = 0; n < length; n++) {
1112     cfs->guarantee_more(8, CHECK_NULL);  // access_flags, name_index, descriptor_index, attributes_count
1113 
1114     AccessFlags access_flags;
1115     jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1116     verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1117     access_flags.set_flags(flags);
1118 
1119     u2 name_index = cfs->get_u2_fast();
1120     int cp_size = _cp->length();
1121     check_property(valid_symbol_at(name_index),
1122       "Invalid constant pool index %u for field name in class file %s",
1123       name_index,
1124       CHECK_NULL);
1125     Symbol*  name = _cp->symbol_at(name_index);
1126     verify_legal_field_name(name, CHECK_NULL);
1127 
1128     u2 signature_index = cfs->get_u2_fast();
1129     check_property(valid_symbol_at(signature_index),
1130       "Invalid constant pool index %u for field signature in class file %s",
1131       signature_index, CHECK_NULL);
1132     Symbol*  sig = _cp->symbol_at(signature_index);
1133     verify_legal_field_signature(name, sig, CHECK_NULL);
1134 
1135     u2 constantvalue_index = 0;
1136     bool is_synthetic = false;
1137     u2 generic_signature_index = 0;
1138     bool is_static = access_flags.is_static();
1139     FieldAnnotationCollector parsed_annotations(_loader_data);
1140 
1141     u2 attributes_count = cfs->get_u2_fast();
1142     if (attributes_count > 0) {
1143       parse_field_attributes(attributes_count, is_static, signature_index,
1144                              &constantvalue_index, &is_synthetic,
1145                              &generic_signature_index, &parsed_annotations,
1146                              CHECK_NULL);
1147       if (parsed_annotations.field_annotations() != NULL) {
1148         if (_fields_annotations == NULL) {
1149           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1150                                              _loader_data, length, NULL,
1151                                              CHECK_NULL);
1152         }
1153         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1154         parsed_annotations.set_field_annotations(NULL);
1155       }
1156       if (parsed_annotations.field_type_annotations() != NULL) {
1157         if (_fields_type_annotations == NULL) {
1158           _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1159                                                   _loader_data, length, NULL,
1160                                                   CHECK_NULL);
1161         }
1162         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1163         parsed_annotations.set_field_type_annotations(NULL);
1164       }
1165 
1166       if (is_synthetic) {
1167         access_flags.set_is_synthetic();
1168       }
1169       if (generic_signature_index != 0) {
1170         access_flags.set_field_has_generic_signature();
1171         fa[generic_signature_slot] = generic_signature_index;
1172         generic_signature_slot ++;
1173         num_generic_signature ++;
1174       }
1175     }
1176 
1177     FieldInfo* field = FieldInfo::from_field_array(fa, n);
1178     field->initialize(access_flags.as_short(),
1179                       name_index,
1180                       signature_index,
1181                       constantvalue_index);
1182     BasicType type = _cp->basic_type_for_signature_at(signature_index);
1183 
1184     // Remember how many oops we encountered and compute allocation type
1185     FieldAllocationType atype = fac->update(is_static, type);
1186     field->set_allocation_type(atype);
1187 
1188     // After field is initialized with type, we can augment it with aux info
1189     if (parsed_annotations.has_any_annotations())
1190       parsed_annotations.apply_to(field);
1191   }
1192 
1193   int index = length;
1194   if (num_injected != 0) {
1195     for (int n = 0; n < num_injected; n++) {
1196       // Check for duplicates
1197       if (injected[n].may_be_java) {
1198         Symbol* name      = injected[n].name();
1199         Symbol* signature = injected[n].signature();
1200         bool duplicate = false;
1201         for (int i = 0; i < length; i++) {
1202           FieldInfo* f = FieldInfo::from_field_array(fa, i);
1203           if (name      == _cp->symbol_at(f->name_index()) &&
1204               signature == _cp->symbol_at(f->signature_index())) {
1205             // Symbol is desclared in Java so skip this one
1206             duplicate = true;
1207             break;
1208           }
1209         }
1210         if (duplicate) {
1211           // These will be removed from the field array at the end
1212           continue;
1213         }
1214       }
1215 
1216       // Injected field
1217       FieldInfo* field = FieldInfo::from_field_array(fa, index);
1218       field->initialize(JVM_ACC_FIELD_INTERNAL,
1219                         injected[n].name_index,
1220                         injected[n].signature_index,
1221                         0);
1222 
1223       BasicType type = FieldType::basic_type(injected[n].signature());
1224 
1225       // Remember how many oops we encountered and compute allocation type
1226       FieldAllocationType atype = fac->update(false, type);
1227       field->set_allocation_type(atype);
1228       index++;
1229     }
1230   }
1231 
1232   // Now copy the fields' data from the temporary resource array.
1233   // Sometimes injected fields already exist in the Java source so
1234   // the fields array could be too long.  In that case the
1235   // fields array is trimed. Also unused slots that were reserved
1236   // for generic signature indexes are discarded.
1237   Array<u2>* fields = MetadataFactory::new_array<u2>(
1238           _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1239           CHECK_NULL);
1240   _fields = fields; // save in case of error
1241   {
1242     int i = 0;
1243     for (; i < index * FieldInfo::field_slots; i++) {
1244       fields->at_put(i, fa[i]);
1245     }
1246     for (int j = total_fields * FieldInfo::field_slots;
1247          j < generic_signature_slot; j++) {
1248       fields->at_put(i++, fa[j]);
1249     }
1250     assert(i == fields->length(), "");
1251   }
1252 
1253   if (_need_verify && length > 1) {
1254     // Check duplicated fields
1255     ResourceMark rm(THREAD);
1256     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1257       THREAD, NameSigHash*, HASH_ROW_SIZE);
1258     initialize_hashtable(names_and_sigs);
1259     bool dup = false;
1260     {
1261       debug_only(No_Safepoint_Verifier nsv;)
1262       for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1263         Symbol* name = fs.name();
1264         Symbol* sig = fs.signature();
1265         // If no duplicates, add name/signature in hashtable names_and_sigs.
1266         if (!put_after_lookup(name, sig, names_and_sigs)) {
1267           dup = true;
1268           break;
1269         }
1270       }
1271     }
1272     if (dup) {
1273       classfile_parse_error("Duplicate field name&signature in class file %s",
1274                             CHECK_NULL);
1275     }
1276   }
1277 
1278   return fields;
1279 }
1280 
1281 
1282 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1283   while (length-- > 0) {
1284     *dest++ = Bytes::get_Java_u2((u1*) (src++));
1285   }
1286 }
1287 
1288 
1289 u2* ClassFileParser::parse_exception_table(u4 code_length,
1290                                            u4 exception_table_length,
1291                                            TRAPS) {
1292   ClassFileStream* cfs = stream();
1293 
1294   u2* exception_table_start = cfs->get_u2_buffer();
1295   assert(exception_table_start != NULL, "null exception table");
1296   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1297   // Will check legal target after parsing code array in verifier.
1298   if (_need_verify) {
1299     for (unsigned int i = 0; i < exception_table_length; i++) {
1300       u2 start_pc = cfs->get_u2_fast();
1301       u2 end_pc = cfs->get_u2_fast();
1302       u2 handler_pc = cfs->get_u2_fast();
1303       u2 catch_type_index = cfs->get_u2_fast();
1304       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1305                          "Illegal exception table range in class file %s",
1306                          CHECK_NULL);
1307       guarantee_property(handler_pc < code_length,
1308                          "Illegal exception table handler in class file %s",
1309                          CHECK_NULL);
1310       if (catch_type_index != 0) {
1311         guarantee_property(valid_klass_reference_at(catch_type_index),
1312                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1313       }
1314     }
1315   } else {
1316     cfs->skip_u2_fast(exception_table_length * 4);
1317   }
1318   return exception_table_start;
1319 }
1320 
1321 void ClassFileParser::parse_linenumber_table(
1322     u4 code_attribute_length, u4 code_length,
1323     CompressedLineNumberWriteStream** write_stream, TRAPS) {
1324   ClassFileStream* cfs = stream();
1325   unsigned int num_entries = cfs->get_u2(CHECK);
1326 
1327   // Each entry is a u2 start_pc, and a u2 line_number
1328   unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1329 
1330   // Verify line number attribute and table length
1331   check_property(
1332     code_attribute_length == sizeof(u2) + length_in_bytes,
1333     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1334 
1335   cfs->guarantee_more(length_in_bytes, CHECK);
1336 
1337   if ((*write_stream) == NULL) {
1338     if (length_in_bytes > fixed_buffer_size) {
1339       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1340     } else {
1341       (*write_stream) = new CompressedLineNumberWriteStream(
1342         linenumbertable_buffer, fixed_buffer_size);
1343     }
1344   }
1345 
1346   while (num_entries-- > 0) {
1347     u2 bci  = cfs->get_u2_fast(); // start_pc
1348     u2 line = cfs->get_u2_fast(); // line_number
1349     guarantee_property(bci < code_length,
1350         "Invalid pc in LineNumberTable in class file %s", CHECK);
1351     (*write_stream)->write_pair(bci, line);
1352   }
1353 }
1354 
1355 
1356 // Class file LocalVariableTable elements.
1357 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1358  public:
1359   u2 start_bci;
1360   u2 length;
1361   u2 name_cp_index;
1362   u2 descriptor_cp_index;
1363   u2 slot;
1364 };
1365 
1366 
1367 class LVT_Hash: public CHeapObj<mtClass> {
1368  public:
1369   LocalVariableTableElement  *_elem;  // element
1370   LVT_Hash*                   _next;  // Next entry in hash table
1371 };
1372 
1373 unsigned int hash(LocalVariableTableElement *elem) {
1374   unsigned int raw_hash = elem->start_bci;
1375 
1376   raw_hash = elem->length        + raw_hash * 37;
1377   raw_hash = elem->name_cp_index + raw_hash * 37;
1378   raw_hash = elem->slot          + raw_hash * 37;
1379 
1380   return raw_hash % HASH_ROW_SIZE;
1381 }
1382 
1383 void initialize_hashtable(LVT_Hash** table) {
1384   for (int i = 0; i < HASH_ROW_SIZE; i++) {
1385     table[i] = NULL;
1386   }
1387 }
1388 
1389 void clear_hashtable(LVT_Hash** table) {
1390   for (int i = 0; i < HASH_ROW_SIZE; i++) {
1391     LVT_Hash* current = table[i];
1392     LVT_Hash* next;
1393     while (current != NULL) {
1394       next = current->_next;
1395       current->_next = NULL;
1396       delete(current);
1397       current = next;
1398     }
1399     table[i] = NULL;
1400   }
1401 }
1402 
1403 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) {
1404   LVT_Hash* entry = table[index];
1405 
1406   /*
1407    * 3-tuple start_bci/length/slot has to be unique key,
1408    * so the following comparison seems to be redundant:
1409    *       && elem->name_cp_index == entry->_elem->name_cp_index
1410    */
1411   while (entry != NULL) {
1412     if (elem->start_bci           == entry->_elem->start_bci
1413      && elem->length              == entry->_elem->length
1414      && elem->name_cp_index       == entry->_elem->name_cp_index
1415      && elem->slot                == entry->_elem->slot
1416     ) {
1417       return entry;
1418     }
1419     entry = entry->_next;
1420   }
1421   return NULL;
1422 }
1423 
1424 // Return false if the local variable is found in table.
1425 // Return true if no duplicate is found.
1426 // And local variable is added as a new entry in table.
1427 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) {
1428   // First lookup for duplicates
1429   int index = hash(elem);
1430   LVT_Hash* entry = LVT_lookup(elem, index, table);
1431 
1432   if (entry != NULL) {
1433       return false;
1434   }
1435   // No duplicate is found, allocate a new entry and fill it.
1436   if ((entry = new LVT_Hash()) == NULL) {
1437     return false;
1438   }
1439   entry->_elem = elem;
1440 
1441   // Insert into hash table
1442   entry->_next = table[index];
1443   table[index] = entry;
1444 
1445   return true;
1446 }
1447 
1448 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1449   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1450   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1451   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1452   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1453   lvt->signature_cp_index  = 0;
1454   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1455 }
1456 
1457 // Function is used to parse both attributes:
1458 //       LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1459 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1460                                                u2 max_locals,
1461                                                u4 code_attribute_length,
1462                                                u2* localvariable_table_length,
1463                                                bool isLVTT,
1464                                                TRAPS) {
1465   ClassFileStream* cfs = stream();
1466   const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1467   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1468   unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1469   // Verify local variable table attribute has right length
1470   if (_need_verify) {
1471     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1472                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1473   }
1474   u2* localvariable_table_start = cfs->get_u2_buffer();
1475   assert(localvariable_table_start != NULL, "null local variable table");
1476   if (!_need_verify) {
1477     cfs->skip_u2_fast(size);
1478   } else {
1479     cfs->guarantee_more(size * 2, CHECK_NULL);
1480     for(int i = 0; i < (*localvariable_table_length); i++) {
1481       u2 start_pc = cfs->get_u2_fast();
1482       u2 length = cfs->get_u2_fast();
1483       u2 name_index = cfs->get_u2_fast();
1484       u2 descriptor_index = cfs->get_u2_fast();
1485       u2 index = cfs->get_u2_fast();
1486       // Assign to a u4 to avoid overflow
1487       u4 end_pc = (u4)start_pc + (u4)length;
1488 
1489       if (start_pc >= code_length) {
1490         classfile_parse_error(
1491           "Invalid start_pc %u in %s in class file %s",
1492           start_pc, tbl_name, CHECK_NULL);
1493       }
1494       if (end_pc > code_length) {
1495         classfile_parse_error(
1496           "Invalid length %u in %s in class file %s",
1497           length, tbl_name, CHECK_NULL);
1498       }
1499       int cp_size = _cp->length();
1500       guarantee_property(valid_symbol_at(name_index),
1501         "Name index %u in %s has bad constant type in class file %s",
1502         name_index, tbl_name, CHECK_NULL);
1503       guarantee_property(valid_symbol_at(descriptor_index),
1504         "Signature index %u in %s has bad constant type in class file %s",
1505         descriptor_index, tbl_name, CHECK_NULL);
1506 
1507       Symbol*  name = _cp->symbol_at(name_index);
1508       Symbol*  sig = _cp->symbol_at(descriptor_index);
1509       verify_legal_field_name(name, CHECK_NULL);
1510       u2 extra_slot = 0;
1511       if (!isLVTT) {
1512         verify_legal_field_signature(name, sig, CHECK_NULL);
1513 
1514         // 4894874: check special cases for double and long local variables
1515         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1516             sig == vmSymbols::type_signature(T_LONG)) {
1517           extra_slot = 1;
1518         }
1519       }
1520       guarantee_property((index + extra_slot) < max_locals,
1521                           "Invalid index %u in %s in class file %s",
1522                           index, tbl_name, CHECK_NULL);
1523     }
1524   }
1525   return localvariable_table_start;
1526 }
1527 
1528 
1529 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1530                                       u1* u1_array, u2* u2_array, TRAPS) {
1531   ClassFileStream* cfs = stream();
1532   u2 index = 0; // index in the array with long/double occupying two slots
1533   u4 i1 = *u1_index;
1534   u4 i2 = *u2_index + 1;
1535   for(int i = 0; i < array_length; i++) {
1536     u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1537     index++;
1538     if (tag == ITEM_Long || tag == ITEM_Double) {
1539       index++;
1540     } else if (tag == ITEM_Object) {
1541       u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1542       guarantee_property(valid_klass_reference_at(class_index),
1543                          "Bad class index %u in StackMap in class file %s",
1544                          class_index, CHECK);
1545     } else if (tag == ITEM_Uninitialized) {
1546       u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1547       guarantee_property(
1548         offset < code_length,
1549         "Bad uninitialized type offset %u in StackMap in class file %s",
1550         offset, CHECK);
1551     } else {
1552       guarantee_property(
1553         tag <= (u1)ITEM_Uninitialized,
1554         "Unknown variable type %u in StackMap in class file %s",
1555         tag, CHECK);
1556     }
1557   }
1558   u2_array[*u2_index] = index;
1559   *u1_index = i1;
1560   *u2_index = i2;
1561 }
1562 
1563 u1* ClassFileParser::parse_stackmap_table(
1564     u4 code_attribute_length, TRAPS) {
1565   if (code_attribute_length == 0)
1566     return NULL;
1567 
1568   ClassFileStream* cfs = stream();
1569   u1* stackmap_table_start = cfs->get_u1_buffer();
1570   assert(stackmap_table_start != NULL, "null stackmap table");
1571 
1572   // check code_attribute_length first
1573   stream()->skip_u1(code_attribute_length, CHECK_NULL);
1574 
1575   if (!_need_verify && !DumpSharedSpaces) {
1576     return NULL;
1577   }
1578   return stackmap_table_start;
1579 }
1580 
1581 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1582                                               u4 method_attribute_length,
1583                                               TRAPS) {
1584   ClassFileStream* cfs = stream();
1585   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1586   *checked_exceptions_length = cfs->get_u2_fast();
1587   unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1588   u2* checked_exceptions_start = cfs->get_u2_buffer();
1589   assert(checked_exceptions_start != NULL, "null checked exceptions");
1590   if (!_need_verify) {
1591     cfs->skip_u2_fast(size);
1592   } else {
1593     // Verify each value in the checked exception table
1594     u2 checked_exception;
1595     u2 len = *checked_exceptions_length;
1596     cfs->guarantee_more(2 * len, CHECK_NULL);
1597     for (int i = 0; i < len; i++) {
1598       checked_exception = cfs->get_u2_fast();
1599       check_property(
1600         valid_klass_reference_at(checked_exception),
1601         "Exception name has bad type at constant pool %u in class file %s",
1602         checked_exception, CHECK_NULL);
1603     }
1604   }
1605   // check exceptions attribute length
1606   if (_need_verify) {
1607     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1608                                                    sizeof(u2) * size),
1609                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1610   }
1611   return checked_exceptions_start;
1612 }
1613 
1614 void ClassFileParser::throwIllegalSignature(
1615     const char* type, Symbol* name, Symbol* sig, TRAPS) {
1616   ResourceMark rm(THREAD);
1617   Exceptions::fthrow(THREAD_AND_LOCATION,
1618       vmSymbols::java_lang_ClassFormatError(),
1619       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1620       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1621 }
1622 
1623 // Skip an annotation.  Return >=limit if there is any problem.
1624 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1625   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1626   // value := switch (tag:u1) { ... }
1627   index += 2;  // skip atype
1628   if ((index += 2) >= limit)  return limit;  // read nmem
1629   int nmem = Bytes::get_Java_u2(buffer+index-2);
1630   while (--nmem >= 0 && index < limit) {
1631     index += 2; // skip member
1632     index = skip_annotation_value(buffer, limit, index);
1633   }
1634   return index;
1635 }
1636 
1637 // Skip an annotation value.  Return >=limit if there is any problem.
1638 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1639   // value := switch (tag:u1) {
1640   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1641   //   case e: e_class:u2 e_name:u2;
1642   //   case s: s_con:u2;
1643   //   case [: do(nval:u2) {value};
1644   //   case @: annotation;
1645   //   case s: s_con:u2;
1646   // }
1647   if ((index += 1) >= limit)  return limit;  // read tag
1648   u1 tag = buffer[index-1];
1649   switch (tag) {
1650   case 'B': case 'C': case 'I': case 'S': case 'Z':
1651   case 'D': case 'F': case 'J': case 'c': case 's':
1652     index += 2;  // skip con or s_con
1653     break;
1654   case 'e':
1655     index += 4;  // skip e_class, e_name
1656     break;
1657   case '[':
1658     {
1659       if ((index += 2) >= limit)  return limit;  // read nval
1660       int nval = Bytes::get_Java_u2(buffer+index-2);
1661       while (--nval >= 0 && index < limit) {
1662         index = skip_annotation_value(buffer, limit, index);
1663       }
1664     }
1665     break;
1666   case '@':
1667     index = skip_annotation(buffer, limit, index);
1668     break;
1669   default:
1670     assert(false, "annotation tag");
1671     return limit;  //  bad tag byte
1672   }
1673   return index;
1674 }
1675 
1676 // Sift through annotations, looking for those significant to the VM:
1677 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1678                                         ClassFileParser::AnnotationCollector* coll,
1679                                         TRAPS) {
1680   // annotations := do(nann:u2) {annotation}
1681   int index = 0;
1682   if ((index += 2) >= limit)  return;  // read nann
1683   int nann = Bytes::get_Java_u2(buffer+index-2);
1684   enum {  // initial annotation layout
1685     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1686     count_off = 2,      // u2   such as 1 (one value)
1687     member_off = 4,     // utf8 such as 'value'
1688     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1689     e_tag_val = 'e',
1690       e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1691       e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1692       e_size = 11,     // end of 'e' annotation
1693     c_tag_val = 'c',    // payload is type
1694       c_con_off = 7,    // utf8 payload, such as 'I'
1695       c_size = 9,       // end of 'c' annotation
1696     s_tag_val = 's',    // payload is String
1697       s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1698       s_size = 9,
1699     min_size = 6        // smallest possible size (zero members)
1700   };
1701   while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1702     int index0 = index;
1703     index = skip_annotation(buffer, limit, index);
1704     u1* abase = buffer + index0;
1705     int atype = Bytes::get_Java_u2(abase + atype_off);
1706     int count = Bytes::get_Java_u2(abase + count_off);
1707     Symbol* aname = check_symbol_at(_cp, atype);
1708     if (aname == NULL)  break;  // invalid annotation name
1709     Symbol* member = NULL;
1710     if (count >= 1) {
1711       int member_index = Bytes::get_Java_u2(abase + member_off);
1712       member = check_symbol_at(_cp, member_index);
1713       if (member == NULL)  break;  // invalid member name
1714     }
1715 
1716     // Here is where parsing particular annotations will take place.
1717     AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1718     if (id == AnnotationCollector::_unknown)  continue;
1719     coll->set_annotation(id);
1720 
1721     if (id == AnnotationCollector::_sun_misc_Contended) {
1722       // @Contended can optionally specify the contention group.
1723       //
1724       // Contended group defines the equivalence class over the fields:
1725       // the fields within the same contended group are not treated distinct.
1726       // The only exception is default group, which does not incur the
1727       // equivalence. Naturally, contention group for classes is meaningless.
1728       //
1729       // While the contention group is specified as String, annotation
1730       // values are already interned, and we might as well use the constant
1731       // pool index as the group tag.
1732       //
1733       u2 group_index = 0; // default contended group
1734       if (count == 1
1735           && s_size == (index - index0)  // match size
1736           && s_tag_val == *(abase + tag_off)
1737           && member == vmSymbols::value_name()) {
1738         group_index = Bytes::get_Java_u2(abase + s_con_off);
1739         if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1740           group_index = 0; // default contended group
1741         }
1742       }
1743       coll->set_contended_group(group_index);
1744     }
1745   }
1746 }
1747 
1748 ClassFileParser::AnnotationCollector::ID
1749 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1750                                                                 Symbol* name) {
1751   vmSymbols::SID sid = vmSymbols::find_sid(name);
1752   // Privileged code can use all annotations.  Other code silently drops some.
1753   const bool privileged = loader_data->is_the_null_class_loader_data() ||
1754                           loader_data->is_ext_class_loader_data() ||
1755                           loader_data->is_anonymous();
1756   switch (sid) {
1757   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1758     if (_location != _in_method)  break;  // only allow for methods
1759     if (!privileged)              break;  // only allow in privileged code
1760     return _method_CallerSensitive;
1761   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1762     if (_location != _in_method)  break;  // only allow for methods
1763     if (!privileged)              break;  // only allow in privileged code
1764     return _method_ForceInline;
1765   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1766     if (_location != _in_method)  break;  // only allow for methods
1767     if (!privileged)              break;  // only allow in privileged code
1768     return _method_DontInline;
1769   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1770     if (_location != _in_method)  break;  // only allow for methods
1771     if (!privileged)              break;  // only allow in privileged code
1772     return _method_LambdaForm_Compiled;
1773   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1774     if (_location != _in_method)  break;  // only allow for methods
1775     if (!privileged)              break;  // only allow in privileged code
1776     return _method_LambdaForm_Hidden;
1777   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1778     if (_location != _in_field)   break;  // only allow for fields
1779     if (!privileged)              break;  // only allow in privileged code
1780     return _field_Stable;
1781   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1782     if (_location != _in_field && _location != _in_class)          break;  // only allow for fields and classes
1783     if (!EnableContended || (RestrictContended && !privileged))    break;  // honor privileges
1784     return _sun_misc_Contended;
1785   default: break;
1786   }
1787   return AnnotationCollector::_unknown;
1788 }
1789 
1790 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1791   if (is_contended())
1792     f->set_contended_group(contended_group());
1793   if (is_stable())
1794     f->set_stable(true);
1795 }
1796 
1797 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1798   // If there's an error deallocate metadata for field annotations
1799   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1800   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1801 }
1802 
1803 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1804   if (has_annotation(_method_CallerSensitive))
1805     m->set_caller_sensitive(true);
1806   if (has_annotation(_method_ForceInline))
1807     m->set_force_inline(true);
1808   if (has_annotation(_method_DontInline))
1809     m->set_dont_inline(true);
1810   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1811     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1812   if (has_annotation(_method_LambdaForm_Hidden))
1813     m->set_hidden(true);
1814 }
1815 
1816 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1817   k->set_is_contended(is_contended());
1818 }
1819 
1820 
1821 #define MAX_ARGS_SIZE 255
1822 #define MAX_CODE_SIZE 65535
1823 #define INITIAL_MAX_LVT_NUMBER 256
1824 
1825 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1826  *
1827  * Rules for LVT's and LVTT's are:
1828  *   - There can be any number of LVT's and LVTT's.
1829  *   - If there are n LVT's, it is the same as if there was just
1830  *     one LVT containing all the entries from the n LVT's.
1831  *   - There may be no more than one LVT entry per local variable.
1832  *     Two LVT entries are 'equal' if these fields are the same:
1833  *        start_pc, length, name, slot
1834  *   - There may be no more than one LVTT entry per each LVT entry.
1835  *     Each LVTT entry has to match some LVT entry.
1836  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1837  */
1838 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1839                                                int lvt_cnt,
1840                                                u2* localvariable_table_length,
1841                                                u2** localvariable_table_start,
1842                                                int lvtt_cnt,
1843                                                u2* localvariable_type_table_length,
1844                                                u2** localvariable_type_table_start,
1845                                                TRAPS) {
1846 
1847   LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE);
1848   initialize_hashtable(lvt_Hash);
1849 
1850   // To fill LocalVariableTable in
1851   Classfile_LVT_Element*  cf_lvt;
1852   LocalVariableTableElement* lvt = cm->localvariable_table_start();
1853 
1854   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1855     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1856     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1857       copy_lvt_element(&cf_lvt[idx], lvt);
1858       // If no duplicates, add LVT elem in hashtable lvt_Hash.
1859       if (LVT_put_after_lookup(lvt, lvt_Hash) == false
1860           && _need_verify
1861           && _major_version >= JAVA_1_5_VERSION) {
1862         clear_hashtable(lvt_Hash);
1863         classfile_parse_error("Duplicated LocalVariableTable attribute "
1864                               "entry for '%s' in class file %s",
1865                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1866                                CHECK);
1867       }
1868     }
1869   }
1870 
1871   // To merge LocalVariableTable and LocalVariableTypeTable
1872   Classfile_LVT_Element* cf_lvtt;
1873   LocalVariableTableElement lvtt_elem;
1874 
1875   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1876     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1877     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1878       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1879       int index = hash(&lvtt_elem);
1880       LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash);
1881       if (entry == NULL) {
1882         if (_need_verify) {
1883           clear_hashtable(lvt_Hash);
1884           classfile_parse_error("LVTT entry for '%s' in class file %s "
1885                                 "does not match any LVT entry",
1886                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1887                                  CHECK);
1888         }
1889       } else if (entry->_elem->signature_cp_index != 0 && _need_verify) {
1890         clear_hashtable(lvt_Hash);
1891         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1892                               "entry for '%s' in class file %s",
1893                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1894                                CHECK);
1895       } else {
1896         // to add generic signatures into LocalVariableTable
1897         entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index;
1898       }
1899     }
1900   }
1901   clear_hashtable(lvt_Hash);
1902 }
1903 
1904 
1905 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1906                                        u1* runtime_visible_annotations,
1907                                        int runtime_visible_annotations_length,
1908                                        u1* runtime_invisible_annotations,
1909                                        int runtime_invisible_annotations_length,
1910                                        u1* runtime_visible_parameter_annotations,
1911                                        int runtime_visible_parameter_annotations_length,
1912                                        u1* runtime_invisible_parameter_annotations,
1913                                        int runtime_invisible_parameter_annotations_length,
1914                                        u1* runtime_visible_type_annotations,
1915                                        int runtime_visible_type_annotations_length,
1916                                        u1* runtime_invisible_type_annotations,
1917                                        int runtime_invisible_type_annotations_length,
1918                                        u1* annotation_default,
1919                                        int annotation_default_length,
1920                                        TRAPS) {
1921 
1922   AnnotationArray* a;
1923 
1924   if (runtime_visible_annotations_length +
1925       runtime_invisible_annotations_length > 0) {
1926      a = assemble_annotations(runtime_visible_annotations,
1927                               runtime_visible_annotations_length,
1928                               runtime_invisible_annotations,
1929                               runtime_invisible_annotations_length,
1930                               CHECK);
1931      cm->set_method_annotations(a);
1932   }
1933 
1934   if (runtime_visible_parameter_annotations_length +
1935       runtime_invisible_parameter_annotations_length > 0) {
1936     a = assemble_annotations(runtime_visible_parameter_annotations,
1937                              runtime_visible_parameter_annotations_length,
1938                              runtime_invisible_parameter_annotations,
1939                              runtime_invisible_parameter_annotations_length,
1940                              CHECK);
1941     cm->set_parameter_annotations(a);
1942   }
1943 
1944   if (annotation_default_length > 0) {
1945     a = assemble_annotations(annotation_default,
1946                              annotation_default_length,
1947                              NULL,
1948                              0,
1949                              CHECK);
1950     cm->set_default_annotations(a);
1951   }
1952 
1953   if (runtime_visible_type_annotations_length +
1954       runtime_invisible_type_annotations_length > 0) {
1955     a = assemble_annotations(runtime_visible_type_annotations,
1956                              runtime_visible_type_annotations_length,
1957                              runtime_invisible_type_annotations,
1958                              runtime_invisible_type_annotations_length,
1959                              CHECK);
1960     cm->set_type_annotations(a);
1961   }
1962 }
1963 
1964 
1965 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1966 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1967 // Method* to save footprint, so we only know the size of the resulting Method* when the
1968 // entire method attribute is parsed.
1969 //
1970 // The promoted_flags parameter is used to pass relevant access_flags
1971 // from the method back up to the containing klass. These flag values
1972 // are added to klass's access_flags.
1973 
1974 methodHandle ClassFileParser::parse_method(bool is_interface,
1975                                            AccessFlags *promoted_flags,
1976                                            TRAPS) {
1977   ClassFileStream* cfs = stream();
1978   methodHandle nullHandle;
1979   ResourceMark rm(THREAD);
1980   // Parse fixed parts
1981   cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1982 
1983   int flags = cfs->get_u2_fast();
1984   u2 name_index = cfs->get_u2_fast();
1985   int cp_size = _cp->length();
1986   check_property(
1987     valid_symbol_at(name_index),
1988     "Illegal constant pool index %u for method name in class file %s",
1989     name_index, CHECK_(nullHandle));
1990   Symbol*  name = _cp->symbol_at(name_index);
1991   verify_legal_method_name(name, CHECK_(nullHandle));
1992 
1993   u2 signature_index = cfs->get_u2_fast();
1994   guarantee_property(
1995     valid_symbol_at(signature_index),
1996     "Illegal constant pool index %u for method signature in class file %s",
1997     signature_index, CHECK_(nullHandle));
1998   Symbol*  signature = _cp->symbol_at(signature_index);
1999 
2000   AccessFlags access_flags;
2001   if (name == vmSymbols::class_initializer_name()) {
2002     // We ignore the other access flags for a valid class initializer.
2003     // (JVM Spec 2nd ed., chapter 4.6)
2004     if (_major_version < 51) { // backward compatibility
2005       flags = JVM_ACC_STATIC;
2006     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2007       flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2008     }
2009   } else {
2010     verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2011   }
2012 
2013   int args_size = -1;  // only used when _need_verify is true
2014   if (_need_verify) {
2015     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2016                  verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2017     if (args_size > MAX_ARGS_SIZE) {
2018       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2019     }
2020   }
2021 
2022   access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2023 
2024   // Default values for code and exceptions attribute elements
2025   u2 max_stack = 0;
2026   u2 max_locals = 0;
2027   u4 code_length = 0;
2028   u1* code_start = 0;
2029   u2 exception_table_length = 0;
2030   u2* exception_table_start = NULL;
2031   Array<int>* exception_handlers = Universe::the_empty_int_array();
2032   u2 checked_exceptions_length = 0;
2033   u2* checked_exceptions_start = NULL;
2034   CompressedLineNumberWriteStream* linenumber_table = NULL;
2035   int linenumber_table_length = 0;
2036   int total_lvt_length = 0;
2037   u2 lvt_cnt = 0;
2038   u2 lvtt_cnt = 0;
2039   bool lvt_allocated = false;
2040   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2041   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2042   u2* localvariable_table_length;
2043   u2** localvariable_table_start;
2044   u2* localvariable_type_table_length;
2045   u2** localvariable_type_table_start;
2046   u2 method_parameters_length = 0;
2047   u1* method_parameters_data = NULL;
2048   bool method_parameters_seen = false;
2049   bool parsed_code_attribute = false;
2050   bool parsed_checked_exceptions_attribute = false;
2051   bool parsed_stackmap_attribute = false;
2052   // stackmap attribute - JDK1.5
2053   u1* stackmap_data = NULL;
2054   int stackmap_data_length = 0;
2055   u2 generic_signature_index = 0;
2056   MethodAnnotationCollector parsed_annotations;
2057   u1* runtime_visible_annotations = NULL;
2058   int runtime_visible_annotations_length = 0;
2059   u1* runtime_invisible_annotations = NULL;
2060   int runtime_invisible_annotations_length = 0;
2061   u1* runtime_visible_parameter_annotations = NULL;
2062   int runtime_visible_parameter_annotations_length = 0;
2063   u1* runtime_invisible_parameter_annotations = NULL;
2064   int runtime_invisible_parameter_annotations_length = 0;
2065   u1* runtime_visible_type_annotations = NULL;
2066   int runtime_visible_type_annotations_length = 0;
2067   u1* runtime_invisible_type_annotations = NULL;
2068   int runtime_invisible_type_annotations_length = 0;
2069   u1* annotation_default = NULL;
2070   int annotation_default_length = 0;
2071 
2072   // Parse code and exceptions attribute
2073   u2 method_attributes_count = cfs->get_u2_fast();
2074   while (method_attributes_count--) {
2075     cfs->guarantee_more(6, CHECK_(nullHandle));  // method_attribute_name_index, method_attribute_length
2076     u2 method_attribute_name_index = cfs->get_u2_fast();
2077     u4 method_attribute_length = cfs->get_u4_fast();
2078     check_property(
2079       valid_symbol_at(method_attribute_name_index),
2080       "Invalid method attribute name index %u in class file %s",
2081       method_attribute_name_index, CHECK_(nullHandle));
2082 
2083     Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2084     if (method_attribute_name == vmSymbols::tag_code()) {
2085       // Parse Code attribute
2086       if (_need_verify) {
2087         guarantee_property(
2088             !access_flags.is_native() && !access_flags.is_abstract(),
2089                         "Code attribute in native or abstract methods in class file %s",
2090                          CHECK_(nullHandle));
2091       }
2092       if (parsed_code_attribute) {
2093         classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2094       }
2095       parsed_code_attribute = true;
2096 
2097       // Stack size, locals size, and code size
2098       if (_major_version == 45 && _minor_version <= 2) {
2099         cfs->guarantee_more(4, CHECK_(nullHandle));
2100         max_stack = cfs->get_u1_fast();
2101         max_locals = cfs->get_u1_fast();
2102         code_length = cfs->get_u2_fast();
2103       } else {
2104         cfs->guarantee_more(8, CHECK_(nullHandle));
2105         max_stack = cfs->get_u2_fast();
2106         max_locals = cfs->get_u2_fast();
2107         code_length = cfs->get_u4_fast();
2108       }
2109       if (_need_verify) {
2110         guarantee_property(args_size <= max_locals,
2111                            "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2112         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2113                            "Invalid method Code length %u in class file %s",
2114                            code_length, CHECK_(nullHandle));
2115       }
2116       // Code pointer
2117       code_start = cfs->get_u1_buffer();
2118       assert(code_start != NULL, "null code start");
2119       cfs->guarantee_more(code_length, CHECK_(nullHandle));
2120       cfs->skip_u1_fast(code_length);
2121 
2122       // Exception handler table
2123       cfs->guarantee_more(2, CHECK_(nullHandle));  // exception_table_length
2124       exception_table_length = cfs->get_u2_fast();
2125       if (exception_table_length > 0) {
2126         exception_table_start =
2127               parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2128       }
2129 
2130       // Parse additional attributes in code attribute
2131       cfs->guarantee_more(2, CHECK_(nullHandle));  // code_attributes_count
2132       u2 code_attributes_count = cfs->get_u2_fast();
2133 
2134       unsigned int calculated_attribute_length = 0;
2135 
2136       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2137         calculated_attribute_length =
2138             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2139       } else {
2140         // max_stack, locals and length are smaller in pre-version 45.2 classes
2141         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2142       }
2143       calculated_attribute_length +=
2144         code_length +
2145         sizeof(exception_table_length) +
2146         sizeof(code_attributes_count) +
2147         exception_table_length *
2148             ( sizeof(u2) +   // start_pc
2149               sizeof(u2) +   // end_pc
2150               sizeof(u2) +   // handler_pc
2151               sizeof(u2) );  // catch_type_index
2152 
2153       while (code_attributes_count--) {
2154         cfs->guarantee_more(6, CHECK_(nullHandle));  // code_attribute_name_index, code_attribute_length
2155         u2 code_attribute_name_index = cfs->get_u2_fast();
2156         u4 code_attribute_length = cfs->get_u4_fast();
2157         calculated_attribute_length += code_attribute_length +
2158                                        sizeof(code_attribute_name_index) +
2159                                        sizeof(code_attribute_length);
2160         check_property(valid_symbol_at(code_attribute_name_index),
2161                        "Invalid code attribute name index %u in class file %s",
2162                        code_attribute_name_index,
2163                        CHECK_(nullHandle));
2164         if (LoadLineNumberTables &&
2165             _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2166           // Parse and compress line number table
2167           parse_linenumber_table(code_attribute_length, code_length,
2168             &linenumber_table, CHECK_(nullHandle));
2169 
2170         } else if (LoadLocalVariableTables &&
2171                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2172           // Parse local variable table
2173           if (!lvt_allocated) {
2174             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2175               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2176             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2177               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2178             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2179               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2180             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2181               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2182             lvt_allocated = true;
2183           }
2184           if (lvt_cnt == max_lvt_cnt) {
2185             max_lvt_cnt <<= 1;
2186             REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2187             REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2188           }
2189           localvariable_table_start[lvt_cnt] =
2190             parse_localvariable_table(code_length,
2191                                       max_locals,
2192                                       code_attribute_length,
2193                                       &localvariable_table_length[lvt_cnt],
2194                                       false,    // is not LVTT
2195                                       CHECK_(nullHandle));
2196           total_lvt_length += localvariable_table_length[lvt_cnt];
2197           lvt_cnt++;
2198         } else if (LoadLocalVariableTypeTables &&
2199                    _major_version >= JAVA_1_5_VERSION &&
2200                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2201           if (!lvt_allocated) {
2202             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2203               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2204             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2205               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2206             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2207               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2208             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2209               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2210             lvt_allocated = true;
2211           }
2212           // Parse local variable type table
2213           if (lvtt_cnt == max_lvtt_cnt) {
2214             max_lvtt_cnt <<= 1;
2215             REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2216             REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2217           }
2218           localvariable_type_table_start[lvtt_cnt] =
2219             parse_localvariable_table(code_length,
2220                                       max_locals,
2221                                       code_attribute_length,
2222                                       &localvariable_type_table_length[lvtt_cnt],
2223                                       true,     // is LVTT
2224                                       CHECK_(nullHandle));
2225           lvtt_cnt++;
2226         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2227                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2228           // Stack map is only needed by the new verifier in JDK1.5.
2229           if (parsed_stackmap_attribute) {
2230             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2231           }
2232           stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2233           stackmap_data_length = code_attribute_length;
2234           parsed_stackmap_attribute = true;
2235         } else {
2236           // Skip unknown attributes
2237           cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2238         }
2239       }
2240       // check method attribute length
2241       if (_need_verify) {
2242         guarantee_property(method_attribute_length == calculated_attribute_length,
2243                            "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2244       }
2245     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2246       // Parse Exceptions attribute
2247       if (parsed_checked_exceptions_attribute) {
2248         classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2249       }
2250       parsed_checked_exceptions_attribute = true;
2251       checked_exceptions_start =
2252             parse_checked_exceptions(&checked_exceptions_length,
2253                                      method_attribute_length,
2254                                      CHECK_(nullHandle));
2255     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2256       // reject multiple method parameters
2257       if (method_parameters_seen) {
2258         classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2259       }
2260       method_parameters_seen = true;
2261       method_parameters_length = cfs->get_u1_fast();
2262       if (method_attribute_length != (method_parameters_length * 4u) + 1u) {
2263         classfile_parse_error(
2264           "Invalid MethodParameters method attribute length %u in class file",
2265           method_attribute_length, CHECK_(nullHandle));
2266       }
2267       method_parameters_data = cfs->get_u1_buffer();
2268       cfs->skip_u2_fast(method_parameters_length);
2269       cfs->skip_u2_fast(method_parameters_length);
2270       // ignore this attribute if it cannot be reflected
2271       if (!SystemDictionary::Parameter_klass_loaded())
2272         method_parameters_length = 0;
2273     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2274       if (method_attribute_length != 0) {
2275         classfile_parse_error(
2276           "Invalid Synthetic method attribute length %u in class file %s",
2277           method_attribute_length, CHECK_(nullHandle));
2278       }
2279       // Should we check that there hasn't already been a synthetic attribute?
2280       access_flags.set_is_synthetic();
2281     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2282       if (method_attribute_length != 0) {
2283         classfile_parse_error(
2284           "Invalid Deprecated method attribute length %u in class file %s",
2285           method_attribute_length, CHECK_(nullHandle));
2286       }
2287     } else if (_major_version >= JAVA_1_5_VERSION) {
2288       if (method_attribute_name == vmSymbols::tag_signature()) {
2289         if (method_attribute_length != 2) {
2290           classfile_parse_error(
2291             "Invalid Signature attribute length %u in class file %s",
2292             method_attribute_length, CHECK_(nullHandle));
2293         }
2294         cfs->guarantee_more(2, CHECK_(nullHandle));  // generic_signature_index
2295         generic_signature_index = cfs->get_u2_fast();
2296       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2297         runtime_visible_annotations_length = method_attribute_length;
2298         runtime_visible_annotations = cfs->get_u1_buffer();
2299         assert(runtime_visible_annotations != NULL, "null visible annotations");
2300         parse_annotations(runtime_visible_annotations,
2301             runtime_visible_annotations_length, &parsed_annotations,
2302             CHECK_(nullHandle));
2303         cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2304       } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2305         runtime_invisible_annotations_length = method_attribute_length;
2306         runtime_invisible_annotations = cfs->get_u1_buffer();
2307         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2308         cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle));
2309       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2310         runtime_visible_parameter_annotations_length = method_attribute_length;
2311         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2312         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2313         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2314       } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2315         runtime_invisible_parameter_annotations_length = method_attribute_length;
2316         runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2317         assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2318         cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle));
2319       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2320         annotation_default_length = method_attribute_length;
2321         annotation_default = cfs->get_u1_buffer();
2322         assert(annotation_default != NULL, "null annotation default");
2323         cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2324       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2325         runtime_visible_type_annotations_length = method_attribute_length;
2326         runtime_visible_type_annotations = cfs->get_u1_buffer();
2327         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2328         // No need for the VM to parse Type annotations
2329         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2330       } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2331         runtime_invisible_type_annotations_length = method_attribute_length;
2332         runtime_invisible_type_annotations = cfs->get_u1_buffer();
2333         assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2334         cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle));
2335       } else {
2336         // Skip unknown attributes
2337         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2338       }
2339     } else {
2340       // Skip unknown attributes
2341       cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2342     }
2343   }
2344 
2345   if (linenumber_table != NULL) {
2346     linenumber_table->write_terminator();
2347     linenumber_table_length = linenumber_table->position();
2348   }
2349 
2350   // Make sure there's at least one Code attribute in non-native/non-abstract method
2351   if (_need_verify) {
2352     guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2353                       "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2354   }
2355 
2356   // All sizing information for a Method* is finally available, now create it
2357   InlineTableSizes sizes(
2358       total_lvt_length,
2359       linenumber_table_length,
2360       exception_table_length,
2361       checked_exceptions_length,
2362       method_parameters_length,
2363       generic_signature_index,
2364       runtime_visible_annotations_length +
2365            runtime_invisible_annotations_length,
2366       runtime_visible_parameter_annotations_length +
2367            runtime_invisible_parameter_annotations_length,
2368       runtime_visible_type_annotations_length +
2369            runtime_invisible_type_annotations_length,
2370       annotation_default_length,
2371       0);
2372 
2373   Method* m = Method::allocate(
2374       _loader_data, code_length, access_flags, &sizes,
2375       ConstMethod::NORMAL, CHECK_(nullHandle));
2376 
2377   ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2378 
2379   // Fill in information from fixed part (access_flags already set)
2380   m->set_constants(_cp);
2381   m->set_name_index(name_index);
2382   m->set_signature_index(signature_index);
2383 #ifdef CC_INTERP
2384   // hmm is there a gc issue here??
2385   ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2386   m->set_result_index(rtf.type());
2387 #endif
2388 
2389   if (args_size >= 0) {
2390     m->set_size_of_parameters(args_size);
2391   } else {
2392     m->compute_size_of_parameters(THREAD);
2393   }
2394 #ifdef ASSERT
2395   if (args_size >= 0) {
2396     m->compute_size_of_parameters(THREAD);
2397     assert(args_size == m->size_of_parameters(), "");
2398   }
2399 #endif
2400 
2401   // Fill in code attribute information
2402   m->set_max_stack(max_stack);
2403   m->set_max_locals(max_locals);
2404   if (stackmap_data != NULL) {
2405     m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2406                                          stackmap_data_length, CHECK_NULL);
2407   }
2408 
2409   // Copy byte codes
2410   m->set_code(code_start);
2411 
2412   // Copy line number table
2413   if (linenumber_table != NULL) {
2414     memcpy(m->compressed_linenumber_table(),
2415            linenumber_table->buffer(), linenumber_table_length);
2416   }
2417 
2418   // Copy exception table
2419   if (exception_table_length > 0) {
2420     int size =
2421       exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2422     copy_u2_with_conversion((u2*) m->exception_table_start(),
2423                              exception_table_start, size);
2424   }
2425 
2426   // Copy method parameters
2427   if (method_parameters_length > 0) {
2428     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2429     for (int i = 0; i < method_parameters_length; i++) {
2430       elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2431       method_parameters_data += 2;
2432       elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2433       method_parameters_data += 2;
2434     }
2435   }
2436 
2437   // Copy checked exceptions
2438   if (checked_exceptions_length > 0) {
2439     int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2440     copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2441   }
2442 
2443   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2444   if (total_lvt_length > 0) {
2445     promoted_flags->set_has_localvariable_table();
2446     copy_localvariable_table(m->constMethod(), lvt_cnt,
2447                              localvariable_table_length,
2448                              localvariable_table_start,
2449                              lvtt_cnt,
2450                              localvariable_type_table_length,
2451                              localvariable_type_table_start, CHECK_NULL);
2452   }
2453 
2454   if (parsed_annotations.has_any_annotations())
2455     parsed_annotations.apply_to(m);
2456 
2457   // Copy annotations
2458   copy_method_annotations(m->constMethod(),
2459                           runtime_visible_annotations,
2460                           runtime_visible_annotations_length,
2461                           runtime_invisible_annotations,
2462                           runtime_invisible_annotations_length,
2463                           runtime_visible_parameter_annotations,
2464                           runtime_visible_parameter_annotations_length,
2465                           runtime_invisible_parameter_annotations,
2466                           runtime_invisible_parameter_annotations_length,
2467                           runtime_visible_type_annotations,
2468                           runtime_visible_type_annotations_length,
2469                           runtime_invisible_type_annotations,
2470                           runtime_invisible_type_annotations_length,
2471                           annotation_default,
2472                           annotation_default_length,
2473                           CHECK_NULL);
2474 
2475   if (name == vmSymbols::finalize_method_name() &&
2476       signature == vmSymbols::void_method_signature()) {
2477     if (m->is_empty_method()) {
2478       _has_empty_finalizer = true;
2479     } else {
2480       _has_finalizer = true;
2481     }
2482   }
2483   if (name == vmSymbols::object_initializer_name() &&
2484       signature == vmSymbols::void_method_signature() &&
2485       m->is_vanilla_constructor()) {
2486     _has_vanilla_constructor = true;
2487   }
2488 
2489   NOT_PRODUCT(m->verify());
2490   return m;
2491 }
2492 
2493 
2494 // The promoted_flags parameter is used to pass relevant access_flags
2495 // from the methods back up to the containing klass. These flag values
2496 // are added to klass's access_flags.
2497 
2498 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2499                                                AccessFlags* promoted_flags,
2500                                                bool* has_final_method,
2501                                                bool* has_default_methods,
2502                                                TRAPS) {
2503   ClassFileStream* cfs = stream();
2504   cfs->guarantee_more(2, CHECK_NULL);  // length
2505   u2 length = cfs->get_u2_fast();
2506   if (length == 0) {
2507     _methods = Universe::the_empty_method_array();
2508   } else {
2509     _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2510 
2511     HandleMark hm(THREAD);
2512     for (int index = 0; index < length; index++) {
2513       methodHandle method = parse_method(is_interface,
2514                                          promoted_flags,
2515                                          CHECK_NULL);
2516 
2517       if (method->is_final()) {
2518         *has_final_method = true;
2519       }
2520       if (is_interface && !method->is_abstract() && !method->is_static()) {
2521         // default method
2522         *has_default_methods = true;
2523       }
2524       _methods->at_put(index, method());
2525     }
2526 
2527     if (_need_verify && length > 1) {
2528       // Check duplicated methods
2529       ResourceMark rm(THREAD);
2530       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2531         THREAD, NameSigHash*, HASH_ROW_SIZE);
2532       initialize_hashtable(names_and_sigs);
2533       bool dup = false;
2534       {
2535         debug_only(No_Safepoint_Verifier nsv;)
2536         for (int i = 0; i < length; i++) {
2537           Method* m = _methods->at(i);
2538           // If no duplicates, add name/signature in hashtable names_and_sigs.
2539           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2540             dup = true;
2541             break;
2542           }
2543         }
2544       }
2545       if (dup) {
2546         classfile_parse_error("Duplicate method name&signature in class file %s",
2547                               CHECK_NULL);
2548       }
2549     }
2550   }
2551   return _methods;
2552 }
2553 
2554 
2555 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2556   int length = methods->length();
2557   // If JVMTI original method ordering or sharing is enabled we have to
2558   // remember the original class file ordering.
2559   // We temporarily use the vtable_index field in the Method* to store the
2560   // class file index, so we can read in after calling qsort.
2561   // Put the method ordering in the shared archive.
2562   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2563     for (int index = 0; index < length; index++) {
2564       Method* m = methods->at(index);
2565       assert(!m->valid_vtable_index(), "vtable index should not be set");
2566       m->set_vtable_index(index);
2567     }
2568   }
2569   // Sort method array by ascending method name (for faster lookups & vtable construction)
2570   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2571   Method::sort_methods(methods);
2572 
2573   intArray* method_ordering = NULL;
2574   // If JVMTI original method ordering or sharing is enabled construct int
2575   // array remembering the original ordering
2576   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2577     method_ordering = new intArray(length);
2578     for (int index = 0; index < length; index++) {
2579       Method* m = methods->at(index);
2580       int old_index = m->vtable_index();
2581       assert(old_index >= 0 && old_index < length, "invalid method index");
2582       method_ordering->at_put(index, old_index);
2583       m->set_vtable_index(Method::invalid_vtable_index);
2584     }
2585   }
2586   return method_ordering;
2587 }
2588 
2589 
2590 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2591   ClassFileStream* cfs = stream();
2592   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2593   u2 sourcefile_index = cfs->get_u2_fast();
2594   check_property(
2595     valid_symbol_at(sourcefile_index),
2596     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2597     sourcefile_index, CHECK);
2598   set_class_sourcefile_index(sourcefile_index);
2599 }
2600 
2601 
2602 
2603 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2604   ClassFileStream* cfs = stream();
2605   u1* sde_buffer = cfs->get_u1_buffer();
2606   assert(sde_buffer != NULL, "null sde buffer");
2607 
2608   // Don't bother storing it if there is no way to retrieve it
2609   if (JvmtiExport::can_get_source_debug_extension()) {
2610     assert((length+1) > length, "Overflow checking");
2611     u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2612     for (int i = 0; i < length; i++) {
2613       sde[i] = sde_buffer[i];
2614     }
2615     sde[length] = '\0';
2616     set_class_sde_buffer((char*)sde, length);
2617   }
2618   // Got utf8 string, set stream position forward
2619   cfs->skip_u1(length, CHECK);
2620 }
2621 
2622 
2623 // Inner classes can be static, private or protected (classic VM does this)
2624 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2625 
2626 // Return number of classes in the inner classes attribute table
2627 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2628                                                             bool parsed_enclosingmethod_attribute,
2629                                                             u2 enclosing_method_class_index,
2630                                                             u2 enclosing_method_method_index,
2631                                                             TRAPS) {
2632   ClassFileStream* cfs = stream();
2633   u1* current_mark = cfs->current();
2634   u2 length = 0;
2635   if (inner_classes_attribute_start != NULL) {
2636     cfs->set_current(inner_classes_attribute_start);
2637     cfs->guarantee_more(2, CHECK_0);  // length
2638     length = cfs->get_u2_fast();
2639   }
2640 
2641   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2642   // method data:
2643   //   [inner_class_info_index,
2644   //    outer_class_info_index,
2645   //    inner_name_index,
2646   //    inner_class_access_flags,
2647   //    ...
2648   //    enclosing_method_class_index,
2649   //    enclosing_method_method_index]
2650   int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2651   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2652   _inner_classes = inner_classes;
2653 
2654   int index = 0;
2655   int cp_size = _cp->length();
2656   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
2657   for (int n = 0; n < length; n++) {
2658     // Inner class index
2659     u2 inner_class_info_index = cfs->get_u2_fast();
2660     check_property(
2661       inner_class_info_index == 0 ||
2662         valid_klass_reference_at(inner_class_info_index),
2663       "inner_class_info_index %u has bad constant type in class file %s",
2664       inner_class_info_index, CHECK_0);
2665     // Outer class index
2666     u2 outer_class_info_index = cfs->get_u2_fast();
2667     check_property(
2668       outer_class_info_index == 0 ||
2669         valid_klass_reference_at(outer_class_info_index),
2670       "outer_class_info_index %u has bad constant type in class file %s",
2671       outer_class_info_index, CHECK_0);
2672     // Inner class name
2673     u2 inner_name_index = cfs->get_u2_fast();
2674     check_property(
2675       inner_name_index == 0 || valid_symbol_at(inner_name_index),
2676       "inner_name_index %u has bad constant type in class file %s",
2677       inner_name_index, CHECK_0);
2678     if (_need_verify) {
2679       guarantee_property(inner_class_info_index != outer_class_info_index,
2680                          "Class is both outer and inner class in class file %s", CHECK_0);
2681     }
2682     // Access flags
2683     AccessFlags inner_access_flags;
2684     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2685     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2686       // Set abstract bit for old class files for backward compatibility
2687       flags |= JVM_ACC_ABSTRACT;
2688     }
2689     verify_legal_class_modifiers(flags, CHECK_0);
2690     inner_access_flags.set_flags(flags);
2691 
2692     inner_classes->at_put(index++, inner_class_info_index);
2693     inner_classes->at_put(index++, outer_class_info_index);
2694     inner_classes->at_put(index++, inner_name_index);
2695     inner_classes->at_put(index++, inner_access_flags.as_short());
2696   }
2697 
2698   // 4347400: make sure there's no duplicate entry in the classes array
2699   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2700     for(int i = 0; i < length * 4; i += 4) {
2701       for(int j = i + 4; j < length * 4; j += 4) {
2702         guarantee_property((inner_classes->at(i)   != inner_classes->at(j) ||
2703                             inner_classes->at(i+1) != inner_classes->at(j+1) ||
2704                             inner_classes->at(i+2) != inner_classes->at(j+2) ||
2705                             inner_classes->at(i+3) != inner_classes->at(j+3)),
2706                             "Duplicate entry in InnerClasses in class file %s",
2707                             CHECK_0);
2708       }
2709     }
2710   }
2711 
2712   // Set EnclosingMethod class and method indexes.
2713   if (parsed_enclosingmethod_attribute) {
2714     inner_classes->at_put(index++, enclosing_method_class_index);
2715     inner_classes->at_put(index++, enclosing_method_method_index);
2716   }
2717   assert(index == size, "wrong size");
2718 
2719   // Restore buffer's current position.
2720   cfs->set_current(current_mark);
2721 
2722   return length;
2723 }
2724 
2725 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2726   set_class_synthetic_flag(true);
2727 }
2728 
2729 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2730   ClassFileStream* cfs = stream();
2731   u2 signature_index = cfs->get_u2(CHECK);
2732   check_property(
2733     valid_symbol_at(signature_index),
2734     "Invalid constant pool index %u in Signature attribute in class file %s",
2735     signature_index, CHECK);
2736   set_class_generic_signature_index(signature_index);
2737 }
2738 
2739 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2740   ClassFileStream* cfs = stream();
2741   u1* current_start = cfs->current();
2742 
2743   cfs->guarantee_more(2, CHECK);  // length
2744   int attribute_array_length = cfs->get_u2_fast();
2745 
2746   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2747                      "Short length on BootstrapMethods in class file %s",
2748                      CHECK);
2749 
2750   // The attribute contains a counted array of counted tuples of shorts,
2751   // represending bootstrap specifiers:
2752   //    length*{bootstrap_method_index, argument_count*{argument_index}}
2753   int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2754   // operand_count = number of shorts in attr, except for leading length
2755 
2756   // The attribute is copied into a short[] array.
2757   // The array begins with a series of short[2] pairs, one for each tuple.
2758   int index_size = (attribute_array_length * 2);
2759 
2760   Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2761 
2762   // Eagerly assign operands so they will be deallocated with the constant
2763   // pool if there is an error.
2764   _cp->set_operands(operands);
2765 
2766   int operand_fill_index = index_size;
2767   int cp_size = _cp->length();
2768 
2769   for (int n = 0; n < attribute_array_length; n++) {
2770     // Store a 32-bit offset into the header of the operand array.
2771     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2772 
2773     // Read a bootstrap specifier.
2774     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
2775     u2 bootstrap_method_index = cfs->get_u2_fast();
2776     u2 argument_count = cfs->get_u2_fast();
2777     check_property(
2778       valid_cp_range(bootstrap_method_index, cp_size) &&
2779       _cp->tag_at(bootstrap_method_index).is_method_handle(),
2780       "bootstrap_method_index %u has bad constant type in class file %s",
2781       bootstrap_method_index,
2782       CHECK);
2783     operands->at_put(operand_fill_index++, bootstrap_method_index);
2784     operands->at_put(operand_fill_index++, argument_count);
2785 
2786     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
2787     for (int j = 0; j < argument_count; j++) {
2788       u2 argument_index = cfs->get_u2_fast();
2789       check_property(
2790         valid_cp_range(argument_index, cp_size) &&
2791         _cp->tag_at(argument_index).is_loadable_constant(),
2792         "argument_index %u has bad constant type in class file %s",
2793         argument_index,
2794         CHECK);
2795       operands->at_put(operand_fill_index++, argument_index);
2796     }
2797   }
2798 
2799   assert(operand_fill_index == operands->length(), "exact fill");
2800   assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode");
2801 
2802   u1* current_end = cfs->current();
2803   guarantee_property(current_end == current_start + attribute_byte_length,
2804                      "Bad length on BootstrapMethods in class file %s",
2805                      CHECK);
2806 }
2807 
2808 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2809                                                  TRAPS) {
2810   ClassFileStream* cfs = stream();
2811   // Set inner classes attribute to default sentinel
2812   _inner_classes = Universe::the_empty_short_array();
2813   cfs->guarantee_more(2, CHECK);  // attributes_count
2814   u2 attributes_count = cfs->get_u2_fast();
2815   bool parsed_sourcefile_attribute = false;
2816   bool parsed_innerclasses_attribute = false;
2817   bool parsed_enclosingmethod_attribute = false;
2818   bool parsed_bootstrap_methods_attribute = false;
2819   u1* runtime_visible_annotations = NULL;
2820   int runtime_visible_annotations_length = 0;
2821   u1* runtime_invisible_annotations = NULL;
2822   int runtime_invisible_annotations_length = 0;
2823   u1* runtime_visible_type_annotations = NULL;
2824   int runtime_visible_type_annotations_length = 0;
2825   u1* runtime_invisible_type_annotations = NULL;
2826   int runtime_invisible_type_annotations_length = 0;
2827   u1* inner_classes_attribute_start = NULL;
2828   u4  inner_classes_attribute_length = 0;
2829   u2  enclosing_method_class_index = 0;
2830   u2  enclosing_method_method_index = 0;
2831   // Iterate over attributes
2832   while (attributes_count--) {
2833     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
2834     u2 attribute_name_index = cfs->get_u2_fast();
2835     u4 attribute_length = cfs->get_u4_fast();
2836     check_property(
2837       valid_symbol_at(attribute_name_index),
2838       "Attribute name has bad constant pool index %u in class file %s",
2839       attribute_name_index, CHECK);
2840     Symbol* tag = _cp->symbol_at(attribute_name_index);
2841     if (tag == vmSymbols::tag_source_file()) {
2842       // Check for SourceFile tag
2843       if (_need_verify) {
2844         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2845       }
2846       if (parsed_sourcefile_attribute) {
2847         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2848       } else {
2849         parsed_sourcefile_attribute = true;
2850       }
2851       parse_classfile_sourcefile_attribute(CHECK);
2852     } else if (tag == vmSymbols::tag_source_debug_extension()) {
2853       // Check for SourceDebugExtension tag
2854       parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2855     } else if (tag == vmSymbols::tag_inner_classes()) {
2856       // Check for InnerClasses tag
2857       if (parsed_innerclasses_attribute) {
2858         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2859       } else {
2860         parsed_innerclasses_attribute = true;
2861       }
2862       inner_classes_attribute_start = cfs->get_u1_buffer();
2863       inner_classes_attribute_length = attribute_length;
2864       cfs->skip_u1(inner_classes_attribute_length, CHECK);
2865     } else if (tag == vmSymbols::tag_synthetic()) {
2866       // Check for Synthetic tag
2867       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2868       if (attribute_length != 0) {
2869         classfile_parse_error(
2870           "Invalid Synthetic classfile attribute length %u in class file %s",
2871           attribute_length, CHECK);
2872       }
2873       parse_classfile_synthetic_attribute(CHECK);
2874     } else if (tag == vmSymbols::tag_deprecated()) {
2875       // Check for Deprecatd tag - 4276120
2876       if (attribute_length != 0) {
2877         classfile_parse_error(
2878           "Invalid Deprecated classfile attribute length %u in class file %s",
2879           attribute_length, CHECK);
2880       }
2881     } else if (_major_version >= JAVA_1_5_VERSION) {
2882       if (tag == vmSymbols::tag_signature()) {
2883         if (attribute_length != 2) {
2884           classfile_parse_error(
2885             "Wrong Signature attribute length %u in class file %s",
2886             attribute_length, CHECK);
2887         }
2888         parse_classfile_signature_attribute(CHECK);
2889       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2890         runtime_visible_annotations_length = attribute_length;
2891         runtime_visible_annotations = cfs->get_u1_buffer();
2892         assert(runtime_visible_annotations != NULL, "null visible annotations");
2893         parse_annotations(runtime_visible_annotations,
2894                           runtime_visible_annotations_length,
2895                           parsed_annotations,
2896                           CHECK);
2897         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2898       } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) {
2899         runtime_invisible_annotations_length = attribute_length;
2900         runtime_invisible_annotations = cfs->get_u1_buffer();
2901         assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2902         cfs->skip_u1(runtime_invisible_annotations_length, CHECK);
2903       } else if (tag == vmSymbols::tag_enclosing_method()) {
2904         if (parsed_enclosingmethod_attribute) {
2905           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2906         }   else {
2907           parsed_enclosingmethod_attribute = true;
2908         }
2909         cfs->guarantee_more(4, CHECK);  // class_index, method_index
2910         enclosing_method_class_index  = cfs->get_u2_fast();
2911         enclosing_method_method_index = cfs->get_u2_fast();
2912         if (enclosing_method_class_index == 0) {
2913           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2914         }
2915         // Validate the constant pool indices and types
2916         check_property(valid_klass_reference_at(enclosing_method_class_index),
2917           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
2918         if (enclosing_method_method_index != 0 &&
2919             (!_cp->is_within_bounds(enclosing_method_method_index) ||
2920              !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
2921           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
2922         }
2923       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
2924                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
2925         if (parsed_bootstrap_methods_attribute)
2926           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
2927         parsed_bootstrap_methods_attribute = true;
2928         parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
2929       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
2930         runtime_visible_type_annotations_length = attribute_length;
2931         runtime_visible_type_annotations = cfs->get_u1_buffer();
2932         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2933         // No need for the VM to parse Type annotations
2934         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
2935       } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
2936         runtime_invisible_type_annotations_length = attribute_length;
2937         runtime_invisible_type_annotations = cfs->get_u1_buffer();
2938         assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2939         cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK);
2940       } else {
2941         // Unknown attribute
2942         cfs->skip_u1(attribute_length, CHECK);
2943       }
2944     } else {
2945       // Unknown attribute
2946       cfs->skip_u1(attribute_length, CHECK);
2947     }
2948   }
2949   _annotations = assemble_annotations(runtime_visible_annotations,
2950                                       runtime_visible_annotations_length,
2951                                       runtime_invisible_annotations,
2952                                       runtime_invisible_annotations_length,
2953                                       CHECK);
2954   _type_annotations = assemble_annotations(runtime_visible_type_annotations,
2955                                            runtime_visible_type_annotations_length,
2956                                            runtime_invisible_type_annotations,
2957                                            runtime_invisible_type_annotations_length,
2958                                            CHECK);
2959 
2960   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
2961     u2 num_of_classes = parse_classfile_inner_classes_attribute(
2962                             inner_classes_attribute_start,
2963                             parsed_innerclasses_attribute,
2964                             enclosing_method_class_index,
2965                             enclosing_method_method_index,
2966                             CHECK);
2967     if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
2968       guarantee_property(
2969         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
2970         "Wrong InnerClasses attribute length in class file %s", CHECK);
2971     }
2972   }
2973 
2974   if (_max_bootstrap_specifier_index >= 0) {
2975     guarantee_property(parsed_bootstrap_methods_attribute,
2976                        "Missing BootstrapMethods attribute in class file %s", CHECK);
2977   }
2978 }
2979 
2980 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
2981   if (_synthetic_flag)
2982     k->set_is_synthetic();
2983   if (_sourcefile_index != 0) {
2984     k->set_source_file_name_index(_sourcefile_index);
2985   }
2986   if (_generic_signature_index != 0) {
2987     k->set_generic_signature_index(_generic_signature_index);
2988   }
2989   if (_sde_buffer != NULL) {
2990     k->set_source_debug_extension(_sde_buffer, _sde_length);
2991   }
2992 }
2993 
2994 // Transfer ownership of metadata allocated to the InstanceKlass.
2995 void ClassFileParser::apply_parsed_class_metadata(
2996                                             instanceKlassHandle this_klass,
2997                                             int java_fields_count, TRAPS) {
2998   // Assign annotations if needed
2999   if (_annotations != NULL || _type_annotations != NULL ||
3000       _fields_annotations != NULL || _fields_type_annotations != NULL) {
3001     Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3002     annotations->set_class_annotations(_annotations);
3003     annotations->set_class_type_annotations(_type_annotations);
3004     annotations->set_fields_annotations(_fields_annotations);
3005     annotations->set_fields_type_annotations(_fields_type_annotations);
3006     this_klass->set_annotations(annotations);
3007   }
3008 
3009   _cp->set_pool_holder(this_klass());
3010   this_klass->set_constants(_cp);
3011   this_klass->set_fields(_fields, java_fields_count);
3012   this_klass->set_methods(_methods);
3013   this_klass->set_inner_classes(_inner_classes);
3014   this_klass->set_local_interfaces(_local_interfaces);
3015   this_klass->set_transitive_interfaces(_transitive_interfaces);
3016 
3017   // Clear out these fields so they don't get deallocated by the destructor
3018   clear_class_metadata();
3019 }
3020 
3021 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3022                                                        int runtime_visible_annotations_length,
3023                                                        u1* runtime_invisible_annotations,
3024                                                        int runtime_invisible_annotations_length, TRAPS) {
3025   AnnotationArray* annotations = NULL;
3026   if (runtime_visible_annotations != NULL ||
3027       runtime_invisible_annotations != NULL) {
3028     annotations = MetadataFactory::new_array<u1>(_loader_data,
3029                                           runtime_visible_annotations_length +
3030                                           runtime_invisible_annotations_length,
3031                                           CHECK_(annotations));
3032     if (runtime_visible_annotations != NULL) {
3033       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3034         annotations->at_put(i, runtime_visible_annotations[i]);
3035       }
3036     }
3037     if (runtime_invisible_annotations != NULL) {
3038       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3039         int append = runtime_visible_annotations_length+i;
3040         annotations->at_put(append, runtime_invisible_annotations[i]);
3041       }
3042     }
3043   }
3044   return annotations;
3045 }
3046 
3047 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3048                                                        TRAPS) {
3049   instanceKlassHandle super_klass;
3050   if (super_class_index == 0) {
3051     check_property(_class_name == vmSymbols::java_lang_Object(),
3052                    "Invalid superclass index %u in class file %s",
3053                    super_class_index,
3054                    CHECK_NULL);
3055   } else {
3056     check_property(valid_klass_reference_at(super_class_index),
3057                    "Invalid superclass index %u in class file %s",
3058                    super_class_index,
3059                    CHECK_NULL);
3060     // The class name should be legal because it is checked when parsing constant pool.
3061     // However, make sure it is not an array type.
3062     bool is_array = false;
3063     if (_cp->tag_at(super_class_index).is_klass()) {
3064       super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3065       if (_need_verify)
3066         is_array = super_klass->oop_is_array();
3067     } else if (_need_verify) {
3068       is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3069     }
3070     if (_need_verify) {
3071       guarantee_property(!is_array,
3072                         "Bad superclass name in class file %s", CHECK_NULL);
3073     }
3074   }
3075   return super_klass;
3076 }
3077 
3078 
3079 // Values needed for oopmap and InstanceKlass creation
3080 class FieldLayoutInfo : public StackObj {
3081  public:
3082   int*          nonstatic_oop_offsets;
3083   unsigned int* nonstatic_oop_counts;
3084   unsigned int  nonstatic_oop_map_count;
3085   unsigned int  total_oop_map_count;
3086   int           instance_size;
3087   int           nonstatic_field_size;
3088   int           static_field_size;
3089   bool          has_nonstatic_fields;
3090 };
3091 
3092 // Layout fields and fill in FieldLayoutInfo.  Could use more refactoring!
3093 void ClassFileParser::layout_fields(Handle class_loader,
3094                                     FieldAllocationCount* fac,
3095                                     ClassAnnotationCollector* parsed_annotations,
3096                                     FieldLayoutInfo* info,
3097                                     TRAPS) {
3098 
3099   // Field size and offset computation
3100   int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3101   int next_static_oop_offset;
3102   int next_static_double_offset;
3103   int next_static_word_offset;
3104   int next_static_short_offset;
3105   int next_static_byte_offset;
3106   int next_nonstatic_oop_offset;
3107   int next_nonstatic_double_offset;
3108   int next_nonstatic_word_offset;
3109   int next_nonstatic_short_offset;
3110   int next_nonstatic_byte_offset;
3111   int first_nonstatic_oop_offset;
3112   int next_nonstatic_field_offset;
3113   int next_nonstatic_padded_offset;
3114 
3115   // Count the contended fields by type.
3116   //
3117   // We ignore static fields, because @Contended is not supported for them.
3118   // The layout code below will also ignore the static fields.
3119   int nonstatic_contended_count = 0;
3120   FieldAllocationCount fac_contended;
3121   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3122     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3123     if (fs.is_contended()) {
3124       fac_contended.count[atype]++;
3125       if (!fs.access_flags().is_static()) {
3126         nonstatic_contended_count++;
3127       }
3128     }
3129   }
3130 
3131 
3132   // Calculate the starting byte offsets
3133   next_static_oop_offset      = InstanceMirrorKlass::offset_of_static_fields();
3134   next_static_double_offset   = next_static_oop_offset +
3135                                 ((fac->count[STATIC_OOP]) * heapOopSize);
3136   if ( fac->count[STATIC_DOUBLE] &&
3137        (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3138         Universe::field_type_should_be_aligned(T_LONG)) ) {
3139     next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3140   }
3141 
3142   next_static_word_offset     = next_static_double_offset +
3143                                 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3144   next_static_short_offset    = next_static_word_offset +
3145                                 ((fac->count[STATIC_WORD]) * BytesPerInt);
3146   next_static_byte_offset     = next_static_short_offset +
3147                                 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3148 
3149   int nonstatic_fields_start  = instanceOopDesc::base_offset_in_bytes() +
3150                                 nonstatic_field_size * heapOopSize;
3151 
3152   next_nonstatic_field_offset = nonstatic_fields_start;
3153 
3154   bool is_contended_class     = parsed_annotations->is_contended();
3155 
3156   // Class is contended, pad before all the fields
3157   if (is_contended_class) {
3158     next_nonstatic_field_offset += ContendedPaddingWidth;
3159   }
3160 
3161   // Compute the non-contended fields count.
3162   // The packing code below relies on these counts to determine if some field
3163   // can be squeezed into the alignment gap. Contended fields are obviously
3164   // exempt from that.
3165   unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3166   unsigned int nonstatic_word_count   = fac->count[NONSTATIC_WORD]   - fac_contended.count[NONSTATIC_WORD];
3167   unsigned int nonstatic_short_count  = fac->count[NONSTATIC_SHORT]  - fac_contended.count[NONSTATIC_SHORT];
3168   unsigned int nonstatic_byte_count   = fac->count[NONSTATIC_BYTE]   - fac_contended.count[NONSTATIC_BYTE];
3169   unsigned int nonstatic_oop_count    = fac->count[NONSTATIC_OOP]    - fac_contended.count[NONSTATIC_OOP];
3170 
3171   // Total non-static fields count, including every contended field
3172   unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3173                                         fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3174                                         fac->count[NONSTATIC_OOP];
3175 
3176   bool super_has_nonstatic_fields =
3177           (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3178   bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3179 
3180 
3181   // Prepare list of oops for oop map generation.
3182   //
3183   // "offset" and "count" lists are describing the set of contiguous oop
3184   // regions. offset[i] is the start of the i-th region, which then has
3185   // count[i] oops following. Before we know how many regions are required,
3186   // we pessimistically allocate the maps to fit all the oops into the
3187   // distinct regions.
3188   //
3189   // TODO: We add +1 to always allocate non-zero resource arrays; we need
3190   // to figure out if we still need to do this.
3191   int* nonstatic_oop_offsets;
3192   unsigned int* nonstatic_oop_counts;
3193   unsigned int nonstatic_oop_map_count = 0;
3194   unsigned int max_nonstatic_oop_maps  = fac->count[NONSTATIC_OOP] + 1;
3195 
3196   nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3197             THREAD, int, max_nonstatic_oop_maps);
3198   nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
3199             THREAD, unsigned int, max_nonstatic_oop_maps);
3200 
3201   first_nonstatic_oop_offset = 0; // will be set for first oop field
3202 
3203   bool compact_fields   = CompactFields;
3204   int  allocation_style = FieldsAllocationStyle;
3205   if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3206     assert(false, "0 <= FieldsAllocationStyle <= 2");
3207     allocation_style = 1; // Optimistic
3208   }
3209 
3210   // The next classes have predefined hard-coded fields offsets
3211   // (see in JavaClasses::compute_hard_coded_offsets()).
3212   // Use default fields allocation order for them.
3213   if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3214       (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3215        _class_name == vmSymbols::java_lang_Class() ||
3216        _class_name == vmSymbols::java_lang_ClassLoader() ||
3217        _class_name == vmSymbols::java_lang_ref_Reference() ||
3218        _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3219        _class_name == vmSymbols::java_lang_StackTraceElement() ||
3220        _class_name == vmSymbols::java_lang_String() ||
3221        _class_name == vmSymbols::java_lang_Throwable() ||
3222        _class_name == vmSymbols::java_lang_Boolean() ||
3223        _class_name == vmSymbols::java_lang_Character() ||
3224        _class_name == vmSymbols::java_lang_Float() ||
3225        _class_name == vmSymbols::java_lang_Double() ||
3226        _class_name == vmSymbols::java_lang_Byte() ||
3227        _class_name == vmSymbols::java_lang_Short() ||
3228        _class_name == vmSymbols::java_lang_Integer() ||
3229        _class_name == vmSymbols::java_lang_Long())) {
3230     allocation_style = 0;     // Allocate oops first
3231     compact_fields   = false; // Don't compact fields
3232   }
3233 
3234   // Rearrange fields for a given allocation style
3235   if( allocation_style == 0 ) {
3236     // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3237     next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3238     next_nonstatic_double_offset = next_nonstatic_oop_offset +
3239                                     (nonstatic_oop_count * heapOopSize);
3240   } else if( allocation_style == 1 ) {
3241     // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3242     next_nonstatic_double_offset = next_nonstatic_field_offset;
3243   } else if( allocation_style == 2 ) {
3244     // Fields allocation: oops fields in super and sub classes are together.
3245     if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3246         _super_klass->nonstatic_oop_map_size() > 0 ) {
3247       unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3248       OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3249       OopMapBlock* last_map = first_map + map_count - 1;
3250       int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3251       if (next_offset == next_nonstatic_field_offset) {
3252         allocation_style = 0;   // allocate oops first
3253         next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3254         next_nonstatic_double_offset = next_nonstatic_oop_offset +
3255                                        (nonstatic_oop_count * heapOopSize);
3256       }
3257     }
3258     if( allocation_style == 2 ) {
3259       allocation_style = 1;     // allocate oops last
3260       next_nonstatic_double_offset = next_nonstatic_field_offset;
3261     }
3262   } else {
3263     ShouldNotReachHere();
3264   }
3265 
3266   int nonstatic_oop_space_count   = 0;
3267   int nonstatic_word_space_count  = 0;
3268   int nonstatic_short_space_count = 0;
3269   int nonstatic_byte_space_count  = 0;
3270   int nonstatic_oop_space_offset;
3271   int nonstatic_word_space_offset;
3272   int nonstatic_short_space_offset;
3273   int nonstatic_byte_space_offset;
3274 
3275   // Try to squeeze some of the fields into the gaps due to
3276   // long/double alignment.
3277   if( nonstatic_double_count > 0 ) {
3278     int offset = next_nonstatic_double_offset;
3279     next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3280     if( compact_fields && offset != next_nonstatic_double_offset ) {
3281       // Allocate available fields into the gap before double field.
3282       int length = next_nonstatic_double_offset - offset;
3283       assert(length == BytesPerInt, "");
3284       nonstatic_word_space_offset = offset;
3285       if( nonstatic_word_count > 0 ) {
3286         nonstatic_word_count      -= 1;
3287         nonstatic_word_space_count = 1; // Only one will fit
3288         length -= BytesPerInt;
3289         offset += BytesPerInt;
3290       }
3291       nonstatic_short_space_offset = offset;
3292       while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3293         nonstatic_short_count       -= 1;
3294         nonstatic_short_space_count += 1;
3295         length -= BytesPerShort;
3296         offset += BytesPerShort;
3297       }
3298       nonstatic_byte_space_offset = offset;
3299       while( length > 0 && nonstatic_byte_count > 0 ) {
3300         nonstatic_byte_count       -= 1;
3301         nonstatic_byte_space_count += 1;
3302         length -= 1;
3303       }
3304       // Allocate oop field in the gap if there are no other fields for that.
3305       nonstatic_oop_space_offset = offset;
3306       if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3307           allocation_style != 0 ) { // when oop fields not first
3308         nonstatic_oop_count      -= 1;
3309         nonstatic_oop_space_count = 1; // Only one will fit
3310         length -= heapOopSize;
3311         offset += heapOopSize;
3312       }
3313     }
3314   }
3315 
3316   next_nonstatic_word_offset  = next_nonstatic_double_offset +
3317                                 (nonstatic_double_count * BytesPerLong);
3318   next_nonstatic_short_offset = next_nonstatic_word_offset +
3319                                 (nonstatic_word_count * BytesPerInt);
3320   next_nonstatic_byte_offset  = next_nonstatic_short_offset +
3321                                 (nonstatic_short_count * BytesPerShort);
3322   next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3323                                 nonstatic_byte_count;
3324 
3325   // let oops jump before padding with this allocation style
3326   if( allocation_style == 1 ) {
3327     next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3328     if( nonstatic_oop_count > 0 ) {
3329       next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3330     }
3331     next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3332   }
3333 
3334   // Iterate over fields again and compute correct offsets.
3335   // The field allocation type was temporarily stored in the offset slot.
3336   // oop fields are located before non-oop fields (static and non-static).
3337   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3338 
3339     // skip already laid out fields
3340     if (fs.is_offset_set()) continue;
3341 
3342     // contended instance fields are handled below
3343     if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3344 
3345     int real_offset;
3346     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3347 
3348     // pack the rest of the fields
3349     switch (atype) {
3350       case STATIC_OOP:
3351         real_offset = next_static_oop_offset;
3352         next_static_oop_offset += heapOopSize;
3353         break;
3354       case STATIC_BYTE:
3355         real_offset = next_static_byte_offset;
3356         next_static_byte_offset += 1;
3357         break;
3358       case STATIC_SHORT:
3359         real_offset = next_static_short_offset;
3360         next_static_short_offset += BytesPerShort;
3361         break;
3362       case STATIC_WORD:
3363         real_offset = next_static_word_offset;
3364         next_static_word_offset += BytesPerInt;
3365         break;
3366       case STATIC_DOUBLE:
3367         real_offset = next_static_double_offset;
3368         next_static_double_offset += BytesPerLong;
3369         break;
3370       case NONSTATIC_OOP:
3371         if( nonstatic_oop_space_count > 0 ) {
3372           real_offset = nonstatic_oop_space_offset;
3373           nonstatic_oop_space_offset += heapOopSize;
3374           nonstatic_oop_space_count  -= 1;
3375         } else {
3376           real_offset = next_nonstatic_oop_offset;
3377           next_nonstatic_oop_offset += heapOopSize;
3378         }
3379         // Update oop maps
3380         if( nonstatic_oop_map_count > 0 &&
3381             nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3382             real_offset -
3383             int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3384             heapOopSize ) {
3385           // Extend current oop map
3386           assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3387           nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3388         } else {
3389           // Create new oop map
3390           assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3391           nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3392           nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3393           nonstatic_oop_map_count += 1;
3394           if( first_nonstatic_oop_offset == 0 ) { // Undefined
3395             first_nonstatic_oop_offset = real_offset;
3396           }
3397         }
3398         break;
3399       case NONSTATIC_BYTE:
3400         if( nonstatic_byte_space_count > 0 ) {
3401           real_offset = nonstatic_byte_space_offset;
3402           nonstatic_byte_space_offset += 1;
3403           nonstatic_byte_space_count  -= 1;
3404         } else {
3405           real_offset = next_nonstatic_byte_offset;
3406           next_nonstatic_byte_offset += 1;
3407         }
3408         break;
3409       case NONSTATIC_SHORT:
3410         if( nonstatic_short_space_count > 0 ) {
3411           real_offset = nonstatic_short_space_offset;
3412           nonstatic_short_space_offset += BytesPerShort;
3413           nonstatic_short_space_count  -= 1;
3414         } else {
3415           real_offset = next_nonstatic_short_offset;
3416           next_nonstatic_short_offset += BytesPerShort;
3417         }
3418         break;
3419       case NONSTATIC_WORD:
3420         if( nonstatic_word_space_count > 0 ) {
3421           real_offset = nonstatic_word_space_offset;
3422           nonstatic_word_space_offset += BytesPerInt;
3423           nonstatic_word_space_count  -= 1;
3424         } else {
3425           real_offset = next_nonstatic_word_offset;
3426           next_nonstatic_word_offset += BytesPerInt;
3427         }
3428         break;
3429       case NONSTATIC_DOUBLE:
3430         real_offset = next_nonstatic_double_offset;
3431         next_nonstatic_double_offset += BytesPerLong;
3432         break;
3433       default:
3434         ShouldNotReachHere();
3435     }
3436     fs.set_offset(real_offset);
3437   }
3438 
3439 
3440   // Handle the contended cases.
3441   //
3442   // Each contended field should not intersect the cache line with another contended field.
3443   // In the absence of alignment information, we end up with pessimistically separating
3444   // the fields with full-width padding.
3445   //
3446   // Additionally, this should not break alignment for the fields, so we round the alignment up
3447   // for each field.
3448   if (nonstatic_contended_count > 0) {
3449 
3450     // if there is at least one contended field, we need to have pre-padding for them
3451     next_nonstatic_padded_offset += ContendedPaddingWidth;
3452 
3453     // collect all contended groups
3454     BitMap bm(_cp->size());
3455     for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3456       // skip already laid out fields
3457       if (fs.is_offset_set()) continue;
3458 
3459       if (fs.is_contended()) {
3460         bm.set_bit(fs.contended_group());
3461       }
3462     }
3463 
3464     int current_group = -1;
3465     while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3466 
3467       for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3468 
3469         // skip already laid out fields
3470         if (fs.is_offset_set()) continue;
3471 
3472         // skip non-contended fields and fields from different group
3473         if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3474 
3475         // handle statics below
3476         if (fs.access_flags().is_static()) continue;
3477 
3478         int real_offset;
3479         FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3480 
3481         switch (atype) {
3482           case NONSTATIC_BYTE:
3483             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3484             real_offset = next_nonstatic_padded_offset;
3485             next_nonstatic_padded_offset += 1;
3486             break;
3487 
3488           case NONSTATIC_SHORT:
3489             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3490             real_offset = next_nonstatic_padded_offset;
3491             next_nonstatic_padded_offset += BytesPerShort;
3492             break;
3493 
3494           case NONSTATIC_WORD:
3495             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
3496             real_offset = next_nonstatic_padded_offset;
3497             next_nonstatic_padded_offset += BytesPerInt;
3498             break;
3499 
3500           case NONSTATIC_DOUBLE:
3501             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
3502             real_offset = next_nonstatic_padded_offset;
3503             next_nonstatic_padded_offset += BytesPerLong;
3504             break;
3505 
3506           case NONSTATIC_OOP:
3507             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
3508             real_offset = next_nonstatic_padded_offset;
3509             next_nonstatic_padded_offset += heapOopSize;
3510 
3511             // Create new oop map
3512             assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3513             nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3514             nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3515             nonstatic_oop_map_count += 1;
3516             if( first_nonstatic_oop_offset == 0 ) { // Undefined
3517               first_nonstatic_oop_offset = real_offset;
3518             }
3519             break;
3520 
3521           default:
3522             ShouldNotReachHere();
3523         }
3524 
3525         if (fs.contended_group() == 0) {
3526           // Contended group defines the equivalence class over the fields:
3527           // the fields within the same contended group are not inter-padded.
3528           // The only exception is default group, which does not incur the
3529           // equivalence, and so requires intra-padding.
3530           next_nonstatic_padded_offset += ContendedPaddingWidth;
3531         }
3532 
3533         fs.set_offset(real_offset);
3534       } // for
3535 
3536       // Start laying out the next group.
3537       // Note that this will effectively pad the last group in the back;
3538       // this is expected to alleviate memory contention effects for
3539       // subclass fields and/or adjacent object.
3540       // If this was the default group, the padding is already in place.
3541       if (current_group != 0) {
3542         next_nonstatic_padded_offset += ContendedPaddingWidth;
3543       }
3544     }
3545 
3546     // handle static fields
3547   }
3548 
3549   // Entire class is contended, pad in the back.
3550   // This helps to alleviate memory contention effects for subclass fields
3551   // and/or adjacent object.
3552   if (is_contended_class) {
3553     next_nonstatic_padded_offset += ContendedPaddingWidth;
3554   }
3555 
3556   int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3557 
3558   int nonstatic_fields_end      = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3559   int instance_end              = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3560   int static_fields_end         = align_size_up(next_static_byte_offset, wordSize);
3561 
3562   int static_field_size         = (static_fields_end -
3563                                    InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3564   nonstatic_field_size          = nonstatic_field_size +
3565                                   (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3566 
3567   int instance_size             = align_object_size(instance_end / wordSize);
3568 
3569   assert(instance_size == align_object_size(align_size_up(
3570          (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3571           wordSize) / wordSize), "consistent layout helper value");
3572 
3573   // Invariant: nonstatic_field end/start should only change if there are
3574   // nonstatic fields in the class, or if the class is contended. We compare
3575   // against the non-aligned value, so that end alignment will not fail the
3576   // assert without actually having the fields.
3577   assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3578          is_contended_class ||
3579          (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3580 
3581   // Number of non-static oop map blocks allocated at end of klass.
3582   const unsigned int total_oop_map_count =
3583     compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3584                           first_nonstatic_oop_offset);
3585 
3586 #ifndef PRODUCT
3587   if (PrintFieldLayout) {
3588     print_field_layout(_class_name,
3589           _fields,
3590           _cp,
3591           instance_size,
3592           nonstatic_fields_start,
3593           nonstatic_fields_end,
3594           static_fields_end);
3595   }
3596 
3597 #endif
3598   // Pass back information needed for InstanceKlass creation
3599   info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3600   info->nonstatic_oop_counts = nonstatic_oop_counts;
3601   info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3602   info->total_oop_map_count = total_oop_map_count;
3603   info->instance_size = instance_size;
3604   info->static_field_size = static_field_size;
3605   info->nonstatic_field_size = nonstatic_field_size;
3606   info->has_nonstatic_fields = has_nonstatic_fields;
3607 }
3608 
3609 
3610 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3611                                                     ClassLoaderData* loader_data,
3612                                                     Handle protection_domain,
3613                                                     KlassHandle host_klass,
3614                                                     GrowableArray<Handle>* cp_patches,
3615                                                     TempNewSymbol& parsed_name,
3616                                                     bool verify,
3617                                                     TRAPS) {
3618 
3619   // When a retransformable agent is attached, JVMTI caches the
3620   // class bytes that existed before the first retransformation.
3621   // If RedefineClasses() was used before the retransformable
3622   // agent attached, then the cached class bytes may not be the
3623   // original class bytes.
3624   JvmtiCachedClassFileData *cached_class_file = NULL;
3625   Handle class_loader(THREAD, loader_data->class_loader());
3626   bool has_default_methods = false;
3627   ResourceMark rm(THREAD);
3628 
3629   ClassFileStream* cfs = stream();
3630   // Timing
3631   assert(THREAD->is_Java_thread(), "must be a JavaThread");
3632   JavaThread* jt = (JavaThread*) THREAD;
3633 
3634   PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3635                             ClassLoader::perf_class_parse_selftime(),
3636                             NULL,
3637                             jt->get_thread_stat()->perf_recursion_counts_addr(),
3638                             jt->get_thread_stat()->perf_timers_addr(),
3639                             PerfClassTraceTime::PARSE_CLASS);
3640 
3641   init_parsed_class_attributes(loader_data);
3642 
3643   if (JvmtiExport::should_post_class_file_load_hook()) {
3644     // Get the cached class file bytes (if any) from the class that
3645     // is being redefined or retransformed. We use jvmti_thread_state()
3646     // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3647     // a JvmtiThreadState any earlier than necessary. This will help
3648     // avoid the bug described by 7126851.
3649     JvmtiThreadState *state = jt->jvmti_thread_state();
3650     if (state != NULL) {
3651       KlassHandle *h_class_being_redefined =
3652                      state->get_class_being_redefined();
3653       if (h_class_being_redefined != NULL) {
3654         instanceKlassHandle ikh_class_being_redefined =
3655           instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3656         cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3657       }
3658     }
3659 
3660     unsigned char* ptr = cfs->buffer();
3661     unsigned char* end_ptr = cfs->buffer() + cfs->length();
3662 
3663     JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3664                                            &ptr, &end_ptr, &cached_class_file);
3665 
3666     if (ptr != cfs->buffer()) {
3667       // JVMTI agent has modified class file data.
3668       // Set new class file stream using JVMTI agent modified
3669       // class file data.
3670       cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3671       set_stream(cfs);
3672     }
3673   }
3674 
3675   _host_klass = host_klass;
3676   _cp_patches = cp_patches;
3677 
3678   instanceKlassHandle nullHandle;
3679 
3680   // Figure out whether we can skip format checking (matching classic VM behavior)
3681   _need_verify = Verifier::should_verify_for(class_loader(), verify);
3682 
3683   // Set the verify flag in stream
3684   cfs->set_verify(_need_verify);
3685 
3686   // Save the class file name for easier error message printing.
3687   _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3688 
3689   cfs->guarantee_more(8, CHECK_(nullHandle));  // magic, major, minor
3690   // Magic value
3691   u4 magic = cfs->get_u4_fast();
3692   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3693                      "Incompatible magic value %u in class file %s",
3694                      magic, CHECK_(nullHandle));
3695 
3696   // Version numbers
3697   u2 minor_version = cfs->get_u2_fast();
3698   u2 major_version = cfs->get_u2_fast();
3699 
3700   // Check version numbers - we check this even with verifier off
3701   if (!is_supported_version(major_version, minor_version)) {
3702     if (name == NULL) {
3703       Exceptions::fthrow(
3704         THREAD_AND_LOCATION,
3705         vmSymbols::java_lang_UnsupportedClassVersionError(),
3706         "Unsupported major.minor version %u.%u",
3707         major_version,
3708         minor_version);
3709     } else {
3710       ResourceMark rm(THREAD);
3711       Exceptions::fthrow(
3712         THREAD_AND_LOCATION,
3713         vmSymbols::java_lang_UnsupportedClassVersionError(),
3714         "%s : Unsupported major.minor version %u.%u",
3715         name->as_C_string(),
3716         major_version,
3717         minor_version);
3718     }
3719     return nullHandle;
3720   }
3721 
3722   _major_version = major_version;
3723   _minor_version = minor_version;
3724 
3725 
3726   // Check if verification needs to be relaxed for this class file
3727   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3728   _relax_verify = Verifier::relax_verify_for(class_loader());
3729 
3730   // Constant pool
3731   constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3732 
3733   int cp_size = cp->length();
3734 
3735   cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
3736 
3737   // Access flags
3738   AccessFlags access_flags;
3739   jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3740 
3741   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3742     // Set abstract bit for old class files for backward compatibility
3743     flags |= JVM_ACC_ABSTRACT;
3744   }
3745   verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3746   access_flags.set_flags(flags);
3747 
3748   // This class and superclass
3749   u2 this_class_index = cfs->get_u2_fast();
3750   check_property(
3751     valid_cp_range(this_class_index, cp_size) &&
3752       cp->tag_at(this_class_index).is_unresolved_klass(),
3753     "Invalid this class index %u in constant pool in class file %s",
3754     this_class_index, CHECK_(nullHandle));
3755 
3756   Symbol*  class_name  = cp->unresolved_klass_at(this_class_index);
3757   assert(class_name != NULL, "class_name can't be null");
3758 
3759   // It's important to set parsed_name *before* resolving the super class.
3760   // (it's used for cleanup by the caller if parsing fails)
3761   parsed_name = class_name;
3762   // parsed_name is returned and can be used if there's an error, so add to
3763   // its reference count.  Caller will decrement the refcount.
3764   parsed_name->increment_refcount();
3765 
3766   // Update _class_name which could be null previously to be class_name
3767   _class_name = class_name;
3768 
3769   // Don't need to check whether this class name is legal or not.
3770   // It has been checked when constant pool is parsed.
3771   // However, make sure it is not an array type.
3772   if (_need_verify) {
3773     guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3774                        "Bad class name in class file %s",
3775                        CHECK_(nullHandle));
3776   }
3777 
3778   Klass* preserve_this_klass;   // for storing result across HandleMark
3779 
3780   // release all handles when parsing is done
3781   { HandleMark hm(THREAD);
3782 
3783     // Checks if name in class file matches requested name
3784     if (name != NULL && class_name != name) {
3785       ResourceMark rm(THREAD);
3786       Exceptions::fthrow(
3787         THREAD_AND_LOCATION,
3788         vmSymbols::java_lang_NoClassDefFoundError(),
3789         "%s (wrong name: %s)",
3790         name->as_C_string(),
3791         class_name->as_C_string()
3792       );
3793       return nullHandle;
3794     }
3795 
3796     if (TraceClassLoadingPreorder) {
3797       tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3798       if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3799       tty->print_cr("]");
3800     }
3801 
3802     u2 super_class_index = cfs->get_u2_fast();
3803     instanceKlassHandle super_klass = parse_super_class(super_class_index,
3804                                                         CHECK_NULL);
3805 
3806     // Interfaces
3807     u2 itfs_len = cfs->get_u2_fast();
3808     Array<Klass*>* local_interfaces =
3809       parse_interfaces(itfs_len, protection_domain, _class_name,
3810                        &has_default_methods, CHECK_(nullHandle));
3811 
3812     u2 java_fields_count = 0;
3813     // Fields (offsets are filled in later)
3814     FieldAllocationCount fac;
3815     Array<u2>* fields = parse_fields(class_name,
3816                                      access_flags.is_interface(),
3817                                      &fac, &java_fields_count,
3818                                      CHECK_(nullHandle));
3819     // Methods
3820     bool has_final_method = false;
3821     AccessFlags promoted_flags;
3822     promoted_flags.set_flags(0);
3823     Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3824                                             &promoted_flags,
3825                                             &has_final_method,
3826                                             &has_default_methods,
3827                                             CHECK_(nullHandle));
3828 
3829     // Additional attributes
3830     ClassAnnotationCollector parsed_annotations;
3831     parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
3832 
3833     // Make sure this is the end of class file stream
3834     guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
3835 
3836     // We check super class after class file is parsed and format is checked
3837     if (super_class_index > 0 && super_klass.is_null()) {
3838       Symbol*  sk  = cp->klass_name_at(super_class_index);
3839       if (access_flags.is_interface()) {
3840         // Before attempting to resolve the superclass, check for class format
3841         // errors not checked yet.
3842         guarantee_property(sk == vmSymbols::java_lang_Object(),
3843                            "Interfaces must have java.lang.Object as superclass in class file %s",
3844                            CHECK_(nullHandle));
3845       }
3846       Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
3847                                                          class_loader,
3848                                                          protection_domain,
3849                                                          true,
3850                                                          CHECK_(nullHandle));
3851 
3852       KlassHandle kh (THREAD, k);
3853       super_klass = instanceKlassHandle(THREAD, kh());
3854     }
3855     if (super_klass.not_null()) {
3856 
3857       if (super_klass->has_default_methods()) {
3858         has_default_methods = true;
3859       }
3860 
3861       if (super_klass->is_interface()) {
3862         ResourceMark rm(THREAD);
3863         Exceptions::fthrow(
3864           THREAD_AND_LOCATION,
3865           vmSymbols::java_lang_IncompatibleClassChangeError(),
3866           "class %s has interface %s as super class",
3867           class_name->as_klass_external_name(),
3868           super_klass->external_name()
3869         );
3870         return nullHandle;
3871       }
3872       // Make sure super class is not final
3873       if (super_klass->is_final()) {
3874         THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
3875       }
3876     }
3877 
3878     // save super klass for error handling.
3879     _super_klass = super_klass;
3880 
3881     // Compute the transitive list of all unique interfaces implemented by this class
3882     _transitive_interfaces =
3883           compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
3884 
3885     // sort methods
3886     intArray* method_ordering = sort_methods(methods);
3887 
3888     // promote flags from parse_methods() to the klass' flags
3889     access_flags.add_promoted_flags(promoted_flags.as_int());
3890 
3891     // Size of Java vtable (in words)
3892     int vtable_size = 0;
3893     int itable_size = 0;
3894     int num_miranda_methods = 0;
3895 
3896     GrowableArray<Method*> all_mirandas(20);
3897 
3898     klassVtable::compute_vtable_size_and_num_mirandas(
3899         &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
3900         access_flags, class_loader, class_name, local_interfaces,
3901                                                       CHECK_(nullHandle));
3902 
3903     // Size of Java itable (in words)
3904     itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
3905 
3906     FieldLayoutInfo info;
3907     layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
3908 
3909     int total_oop_map_size2 =
3910           InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
3911 
3912     // Compute reference type
3913     ReferenceType rt;
3914     if (super_klass() == NULL) {
3915       rt = REF_NONE;
3916     } else {
3917       rt = super_klass->reference_type();
3918     }
3919 
3920     // We can now create the basic Klass* for this klass
3921     _klass = InstanceKlass::allocate_instance_klass(loader_data,
3922                                                     vtable_size,
3923                                                     itable_size,
3924                                                     info.static_field_size,
3925                                                     total_oop_map_size2,
3926                                                     rt,
3927                                                     access_flags,
3928                                                     name,
3929                                                     super_klass(),
3930                                                     !host_klass.is_null(),
3931                                                     CHECK_(nullHandle));
3932     instanceKlassHandle this_klass (THREAD, _klass);
3933 
3934     assert(this_klass->static_field_size() == info.static_field_size, "sanity");
3935     assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
3936            "sanity");
3937 
3938     // Fill in information already parsed
3939     this_klass->set_should_verify_class(verify);
3940     jint lh = Klass::instance_layout_helper(info.instance_size, false);
3941     this_klass->set_layout_helper(lh);
3942     assert(this_klass->oop_is_instance(), "layout is correct");
3943     assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
3944     // Not yet: supers are done below to support the new subtype-checking fields
3945     //this_klass->set_super(super_klass());
3946     this_klass->set_class_loader_data(loader_data);
3947     this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
3948     this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
3949     this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
3950 
3951     apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
3952 
3953     if (has_final_method) {
3954       this_klass->set_has_final_method();
3955     }
3956     this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
3957     // The InstanceKlass::_methods_jmethod_ids cache
3958     // is managed on the assumption that the initial cache
3959     // size is equal to the number of methods in the class. If
3960     // that changes, then InstanceKlass::idnum_can_increment()
3961     // has to be changed accordingly.
3962     this_klass->set_initial_method_idnum(methods->length());
3963     this_klass->set_name(cp->klass_name_at(this_class_index));
3964     if (is_anonymous())  // I am well known to myself
3965       cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
3966 
3967     this_klass->set_minor_version(minor_version);
3968     this_klass->set_major_version(major_version);
3969     this_klass->set_has_default_methods(has_default_methods);
3970 
3971     // Set up Method*::intrinsic_id as soon as we know the names of methods.
3972     // (We used to do this lazily, but now we query it in Rewriter,
3973     // which is eagerly done for every method, so we might as well do it now,
3974     // when everything is fresh in memory.)
3975     if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) {
3976       for (int j = 0; j < methods->length(); j++) {
3977         methods->at(j)->init_intrinsic_id();
3978       }
3979     }
3980 
3981     if (cached_class_file != NULL) {
3982       // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
3983       this_klass->set_cached_class_file(cached_class_file);
3984     }
3985 
3986     // Fill in field values obtained by parse_classfile_attributes
3987     if (parsed_annotations.has_any_annotations())
3988       parsed_annotations.apply_to(this_klass);
3989     apply_parsed_class_attributes(this_klass);
3990 
3991     // Miranda methods
3992     if ((num_miranda_methods > 0) ||
3993         // if this class introduced new miranda methods or
3994         (super_klass.not_null() && (super_klass->has_miranda_methods()))
3995         // super class exists and this class inherited miranda methods
3996         ) {
3997       this_klass->set_has_miranda_methods(); // then set a flag
3998     }
3999 
4000     // Fill in information needed to compute superclasses.
4001     this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4002 
4003     // Initialize itable offset tables
4004     klassItable::setup_itable_offset_table(this_klass);
4005 
4006     // Compute transitive closure of interfaces this class implements
4007     // Do final class setup
4008     fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4009 
4010     // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4011     set_precomputed_flags(this_klass);
4012 
4013     // reinitialize modifiers, using the InnerClasses attribute
4014     int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4015     this_klass->set_modifier_flags(computed_modifiers);
4016 
4017     // check if this class can access its super class
4018     check_super_class_access(this_klass, CHECK_(nullHandle));
4019 
4020     // check if this class can access its superinterfaces
4021     check_super_interface_access(this_klass, CHECK_(nullHandle));
4022 
4023     // check if this class overrides any final method
4024     check_final_method_override(this_klass, CHECK_(nullHandle));
4025 
4026     // check that if this class is an interface then it doesn't have static methods
4027     if (this_klass->is_interface()) {
4028       /* An interface in a JAVA 8 classfile can be static */
4029       if (_major_version < JAVA_8_VERSION) {
4030         check_illegal_static_method(this_klass, CHECK_(nullHandle));
4031       }
4032     }
4033 
4034     // Allocate mirror and initialize static fields
4035     java_lang_Class::create_mirror(this_klass, protection_domain, CHECK_(nullHandle));
4036 
4037 
4038     // Generate any default methods - default methods are interface methods
4039     // that have a default implementation.  This is new with Lambda project.
4040     if (has_default_methods && !access_flags.is_interface() &&
4041         local_interfaces->length() > 0) {
4042       DefaultMethods::generate_default_methods(
4043           this_klass(), &all_mirandas, CHECK_(nullHandle));
4044     }
4045 
4046     // Update the loader_data graph.
4047     record_defined_class_dependencies(this_klass, CHECK_NULL);
4048 
4049     ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4050                                              false /* not shared class */);
4051 
4052     if (TraceClassLoading) {
4053       ResourceMark rm;
4054       // print in a single call to reduce interleaving of output
4055       if (cfs->source() != NULL) {
4056         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4057                    cfs->source());
4058       } else if (class_loader.is_null()) {
4059         if (THREAD->is_Java_thread()) {
4060           Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1);
4061           tty->print("[Loaded %s by instance of %s]\n",
4062                      this_klass->external_name(),
4063                      InstanceKlass::cast(caller)->external_name());
4064         } else {
4065           tty->print("[Loaded %s]\n", this_klass->external_name());
4066         }
4067       } else {
4068         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4069                    InstanceKlass::cast(class_loader->klass())->external_name());
4070       }
4071     }
4072 
4073     if (TraceClassResolution) {
4074       ResourceMark rm;
4075       // print out the superclass.
4076       const char * from = this_klass()->external_name();
4077       if (this_klass->java_super() != NULL) {
4078         tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name());
4079       }
4080       // print out each of the interface classes referred to by this class.
4081       Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4082       if (local_interfaces != NULL) {
4083         int length = local_interfaces->length();
4084         for (int i = 0; i < length; i++) {
4085           Klass* k = local_interfaces->at(i);
4086           InstanceKlass* to_class = InstanceKlass::cast(k);
4087           const char * to = to_class->external_name();
4088           tty->print("RESOLVE %s %s (interface)\n", from, to);
4089         }
4090       }
4091     }
4092 
4093     // preserve result across HandleMark
4094     preserve_this_klass = this_klass();
4095   }
4096 
4097   // Create new handle outside HandleMark (might be needed for
4098   // Extended Class Redefinition)
4099   instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4100   debug_only(this_klass->verify();)
4101 
4102   // Clear class if no error has occurred so destructor doesn't deallocate it
4103   _klass = NULL;
4104   return this_klass;
4105 }
4106 
4107 // Destructor to clean up if there's an error
4108 ClassFileParser::~ClassFileParser() {
4109   MetadataFactory::free_metadata(_loader_data, _cp);
4110   MetadataFactory::free_array<u2>(_loader_data, _fields);
4111 
4112   // Free methods
4113   InstanceKlass::deallocate_methods(_loader_data, _methods);
4114 
4115   // beware of the Universe::empty_blah_array!!
4116   if (_inner_classes != Universe::the_empty_short_array()) {
4117     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4118   }
4119 
4120   // Free interfaces
4121   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4122                                        _local_interfaces, _transitive_interfaces);
4123 
4124   MetadataFactory::free_array<u1>(_loader_data, _annotations);
4125   MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4126   Annotations::free_contents(_loader_data, _fields_annotations);
4127   Annotations::free_contents(_loader_data, _fields_type_annotations);
4128 
4129   clear_class_metadata();
4130 
4131   // deallocate the klass if already created.
4132   MetadataFactory::free_metadata(_loader_data, _klass);
4133   _klass = NULL;
4134 }
4135 
4136 void ClassFileParser::print_field_layout(Symbol* name,
4137                                          Array<u2>* fields,
4138                                          constantPoolHandle cp,
4139                                          int instance_size,
4140                                          int instance_fields_start,
4141                                          int instance_fields_end,
4142                                          int static_fields_end) {
4143   tty->print("%s: field layout\n", name->as_klass_external_name());
4144   tty->print("  @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4145   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4146     if (!fs.access_flags().is_static()) {
4147       tty->print("  @%3d \"%s\" %s\n",
4148           fs.offset(),
4149           fs.name()->as_klass_external_name(),
4150           fs.signature()->as_klass_external_name());
4151     }
4152   }
4153   tty->print("  @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4154   tty->print("  @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4155   tty->print("  @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4156   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4157     if (fs.access_flags().is_static()) {
4158       tty->print("  @%3d \"%s\" %s\n",
4159           fs.offset(),
4160           fs.name()->as_klass_external_name(),
4161           fs.signature()->as_klass_external_name());
4162     }
4163   }
4164   tty->print("  @%3d %s\n", static_fields_end, "--- static fields end ---");
4165   tty->print("\n");
4166 }
4167 
4168 unsigned int
4169 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4170                                        unsigned int nonstatic_oop_map_count,
4171                                        int first_nonstatic_oop_offset) {
4172   unsigned int map_count =
4173     super.is_null() ? 0 : super->nonstatic_oop_map_count();
4174   if (nonstatic_oop_map_count > 0) {
4175     // We have oops to add to map
4176     if (map_count == 0) {
4177       map_count = nonstatic_oop_map_count;
4178     } else {
4179       // Check whether we should add a new map block or whether the last one can
4180       // be extended
4181       OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4182       OopMapBlock* const last_map = first_map + map_count - 1;
4183 
4184       int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4185       if (next_offset == first_nonstatic_oop_offset) {
4186         // There is no gap bettwen superklass's last oop field and first
4187         // local oop field, merge maps.
4188         nonstatic_oop_map_count -= 1;
4189       } else {
4190         // Superklass didn't end with a oop field, add extra maps
4191         assert(next_offset < first_nonstatic_oop_offset, "just checking");
4192       }
4193       map_count += nonstatic_oop_map_count;
4194     }
4195   }
4196   return map_count;
4197 }
4198 
4199 
4200 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4201                                     unsigned int nonstatic_oop_map_count,
4202                                     int* nonstatic_oop_offsets,
4203                                     unsigned int* nonstatic_oop_counts) {
4204   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4205   const InstanceKlass* const super = k->superklass();
4206   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4207   if (super_count > 0) {
4208     // Copy maps from superklass
4209     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4210     for (unsigned int i = 0; i < super_count; ++i) {
4211       *this_oop_map++ = *super_oop_map++;
4212     }
4213   }
4214 
4215   if (nonstatic_oop_map_count > 0) {
4216     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4217       // The counts differ because there is no gap between superklass's last oop
4218       // field and the first local oop field.  Extend the last oop map copied
4219       // from the superklass instead of creating new one.
4220       nonstatic_oop_map_count--;
4221       nonstatic_oop_offsets++;
4222       this_oop_map--;
4223       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4224       this_oop_map++;
4225     }
4226 
4227     // Add new map blocks, fill them
4228     while (nonstatic_oop_map_count-- > 0) {
4229       this_oop_map->set_offset(*nonstatic_oop_offsets++);
4230       this_oop_map->set_count(*nonstatic_oop_counts++);
4231       this_oop_map++;
4232     }
4233     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4234            this_oop_map, "sanity");
4235   }
4236 }
4237 
4238 
4239 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4240   Klass* super = k->super();
4241 
4242   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4243   // in which case we don't have to register objects as finalizable
4244   if (!_has_empty_finalizer) {
4245     if (_has_finalizer ||
4246         (super != NULL && super->has_finalizer())) {
4247       k->set_has_finalizer();
4248     }
4249   }
4250 
4251 #ifdef ASSERT
4252   bool f = false;
4253   Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4254                                  vmSymbols::void_method_signature());
4255   if (m != NULL && !m->is_empty_method()) {
4256     f = true;
4257   }
4258   assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4259 #endif
4260 
4261   // Check if this klass supports the java.lang.Cloneable interface
4262   if (SystemDictionary::Cloneable_klass_loaded()) {
4263     if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4264       k->set_is_cloneable();
4265     }
4266   }
4267 
4268   // Check if this klass has a vanilla default constructor
4269   if (super == NULL) {
4270     // java.lang.Object has empty default constructor
4271     k->set_has_vanilla_constructor();
4272   } else {
4273     if (super->has_vanilla_constructor() &&
4274         _has_vanilla_constructor) {
4275       k->set_has_vanilla_constructor();
4276     }
4277 #ifdef ASSERT
4278     bool v = false;
4279     if (super->has_vanilla_constructor()) {
4280       Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4281 ), vmSymbols::void_method_signature());
4282       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4283         v = true;
4284       }
4285     }
4286     assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4287 #endif
4288   }
4289 
4290   // If it cannot be fast-path allocated, set a bit in the layout helper.
4291   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4292   assert(k->size_helper() > 0, "layout_helper is initialized");
4293   if ((!RegisterFinalizersAtInit && k->has_finalizer())
4294       || k->is_abstract() || k->is_interface()
4295       || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4296       || k->size_helper() >= FastAllocateSizeLimit) {
4297     // Forbid fast-path allocation.
4298     jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4299     k->set_layout_helper(lh);
4300   }
4301 }
4302 
4303 // Attach super classes and interface classes to class loader data
4304 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4305   ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4306   if (defining_loader_data->is_the_null_class_loader_data()) {
4307       // Dependencies to null class loader data are implicit.
4308       return;
4309   } else {
4310     // add super class dependency
4311     Klass* super = defined_klass->super();
4312     if (super != NULL) {
4313       defining_loader_data->record_dependency(super, CHECK);
4314     }
4315 
4316     // add super interface dependencies
4317     Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4318     if (local_interfaces != NULL) {
4319       int length = local_interfaces->length();
4320       for (int i = 0; i < length; i++) {
4321         defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4322       }
4323     }
4324   }
4325 }
4326 
4327 // utility methods for appending an array with check for duplicates
4328 
4329 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4330   // iterate over new interfaces
4331   for (int i = 0; i < ifs->length(); i++) {
4332     Klass* e = ifs->at(i);
4333     assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4334     // add new interface
4335     result->append_if_missing(e);
4336   }
4337 }
4338 
4339 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4340                                         instanceKlassHandle super,
4341                                         Array<Klass*>* local_ifs, TRAPS) {
4342   // Compute maximum size for transitive interfaces
4343   int max_transitive_size = 0;
4344   int super_size = 0;
4345   // Add superclass transitive interfaces size
4346   if (super.not_null()) {
4347     super_size = super->transitive_interfaces()->length();
4348     max_transitive_size += super_size;
4349   }
4350   // Add local interfaces' super interfaces
4351   int local_size = local_ifs->length();
4352   for (int i = 0; i < local_size; i++) {
4353     Klass* l = local_ifs->at(i);
4354     max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4355   }
4356   // Finally add local interfaces
4357   max_transitive_size += local_size;
4358   // Construct array
4359   if (max_transitive_size == 0) {
4360     // no interfaces, use canonicalized array
4361     return Universe::the_empty_klass_array();
4362   } else if (max_transitive_size == super_size) {
4363     // no new local interfaces added, share superklass' transitive interface array
4364     return super->transitive_interfaces();
4365   } else if (max_transitive_size == local_size) {
4366     // only local interfaces added, share local interface array
4367     return local_ifs;
4368   } else {
4369     ResourceMark rm;
4370     GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4371 
4372     // Copy down from superclass
4373     if (super.not_null()) {
4374       append_interfaces(result, super->transitive_interfaces());
4375     }
4376 
4377     // Copy down from local interfaces' superinterfaces
4378     for (int i = 0; i < local_ifs->length(); i++) {
4379       Klass* l = local_ifs->at(i);
4380       append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4381     }
4382     // Finally add local interfaces
4383     append_interfaces(result, local_ifs);
4384 
4385     // length will be less than the max_transitive_size if duplicates were removed
4386     int length = result->length();
4387     assert(length <= max_transitive_size, "just checking");
4388     Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4389     for (int i = 0; i < length; i++) {
4390       Klass* e = result->at(i);
4391         assert(e != NULL, "just checking");
4392       new_result->at_put(i, e);
4393     }
4394     return new_result;
4395   }
4396 }
4397 
4398 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4399   Klass* super = this_klass->super();
4400   if ((super != NULL) &&
4401       (!Reflection::verify_class_access(this_klass(), super, false))) {
4402     ResourceMark rm(THREAD);
4403     Exceptions::fthrow(
4404       THREAD_AND_LOCATION,
4405       vmSymbols::java_lang_IllegalAccessError(),
4406       "class %s cannot access its superclass %s",
4407       this_klass->external_name(),
4408       InstanceKlass::cast(super)->external_name()
4409     );
4410     return;
4411   }
4412 }
4413 
4414 
4415 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4416   Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4417   int lng = local_interfaces->length();
4418   for (int i = lng - 1; i >= 0; i--) {
4419     Klass* k = local_interfaces->at(i);
4420     assert (k != NULL && k->is_interface(), "invalid interface");
4421     if (!Reflection::verify_class_access(this_klass(), k, false)) {
4422       ResourceMark rm(THREAD);
4423       Exceptions::fthrow(
4424         THREAD_AND_LOCATION,
4425         vmSymbols::java_lang_IllegalAccessError(),
4426         "class %s cannot access its superinterface %s",
4427         this_klass->external_name(),
4428         InstanceKlass::cast(k)->external_name()
4429       );
4430       return;
4431     }
4432   }
4433 }
4434 
4435 
4436 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4437   Array<Method*>* methods = this_klass->methods();
4438   int num_methods = methods->length();
4439 
4440   // go thru each method and check if it overrides a final method
4441   for (int index = 0; index < num_methods; index++) {
4442     Method* m = methods->at(index);
4443 
4444     // skip private, static and <init> methods
4445     if ((!m->is_private()) &&
4446         (!m->is_static()) &&
4447         (m->name() != vmSymbols::object_initializer_name())) {
4448 
4449       Symbol* name = m->name();
4450       Symbol* signature = m->signature();
4451       Klass* k = this_klass->super();
4452       Method* super_m = NULL;
4453       while (k != NULL) {
4454         // skip supers that don't have final methods.
4455         if (k->has_final_method()) {
4456           // lookup a matching method in the super class hierarchy
4457           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4458           if (super_m == NULL) {
4459             break; // didn't find any match; get out
4460           }
4461 
4462           if (super_m->is_final() &&
4463               // matching method in super is final
4464               (Reflection::verify_field_access(this_klass(),
4465                                                super_m->method_holder(),
4466                                                super_m->method_holder(),
4467                                                super_m->access_flags(), false))
4468             // this class can access super final method and therefore override
4469             ) {
4470             ResourceMark rm(THREAD);
4471             Exceptions::fthrow(
4472               THREAD_AND_LOCATION,
4473               vmSymbols::java_lang_VerifyError(),
4474               "class %s overrides final method %s.%s",
4475               this_klass->external_name(),
4476               name->as_C_string(),
4477               signature->as_C_string()
4478             );
4479             return;
4480           }
4481 
4482           // continue to look from super_m's holder's super.
4483           k = super_m->method_holder()->super();
4484           continue;
4485         }
4486 
4487         k = k->super();
4488       }
4489     }
4490   }
4491 }
4492 
4493 
4494 // assumes that this_klass is an interface
4495 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4496   assert(this_klass->is_interface(), "not an interface");
4497   Array<Method*>* methods = this_klass->methods();
4498   int num_methods = methods->length();
4499 
4500   for (int index = 0; index < num_methods; index++) {
4501     Method* m = methods->at(index);
4502     // if m is static and not the init method, throw a verify error
4503     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4504       ResourceMark rm(THREAD);
4505       Exceptions::fthrow(
4506         THREAD_AND_LOCATION,
4507         vmSymbols::java_lang_VerifyError(),
4508         "Illegal static method %s in interface %s",
4509         m->name()->as_C_string(),
4510         this_klass->external_name()
4511       );
4512       return;
4513     }
4514   }
4515 }
4516 
4517 // utility methods for format checking
4518 
4519 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4520   if (!_need_verify) { return; }
4521 
4522   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4523   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4524   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4525   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4526   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4527   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4528   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
4529 
4530   if ((is_abstract && is_final) ||
4531       (is_interface && !is_abstract) ||
4532       (is_interface && major_gte_15 && (is_super || is_enum)) ||
4533       (!is_interface && major_gte_15 && is_annotation)) {
4534     ResourceMark rm(THREAD);
4535     Exceptions::fthrow(
4536       THREAD_AND_LOCATION,
4537       vmSymbols::java_lang_ClassFormatError(),
4538       "Illegal class modifiers in class %s: 0x%X",
4539       _class_name->as_C_string(), flags
4540     );
4541     return;
4542   }
4543 }
4544 
4545 bool ClassFileParser::has_illegal_visibility(jint flags) {
4546   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4547   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4548   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4549 
4550   return ((is_public && is_protected) ||
4551           (is_public && is_private) ||
4552           (is_protected && is_private));
4553 }
4554 
4555 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4556   u2 max_version =
4557     JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION :
4558     (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION);
4559   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4560          (major <= max_version) &&
4561          ((major != max_version) ||
4562           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4563 }
4564 
4565 void ClassFileParser::verify_legal_field_modifiers(
4566     jint flags, bool is_interface, TRAPS) {
4567   if (!_need_verify) { return; }
4568 
4569   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4570   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4571   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4572   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4573   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4574   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4575   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4576   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4577   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4578 
4579   bool is_illegal = false;
4580 
4581   if (is_interface) {
4582     if (!is_public || !is_static || !is_final || is_private ||
4583         is_protected || is_volatile || is_transient ||
4584         (major_gte_15 && is_enum)) {
4585       is_illegal = true;
4586     }
4587   } else { // not interface
4588     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4589       is_illegal = true;
4590     }
4591   }
4592 
4593   if (is_illegal) {
4594     ResourceMark rm(THREAD);
4595     Exceptions::fthrow(
4596       THREAD_AND_LOCATION,
4597       vmSymbols::java_lang_ClassFormatError(),
4598       "Illegal field modifiers in class %s: 0x%X",
4599       _class_name->as_C_string(), flags);
4600     return;
4601   }
4602 }
4603 
4604 void ClassFileParser::verify_legal_method_modifiers(
4605     jint flags, bool is_interface, Symbol* name, TRAPS) {
4606   if (!_need_verify) { return; }
4607 
4608   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4609   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4610   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4611   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4612   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4613   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4614   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4615   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4616   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4617   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4618   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
4619   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4620   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4621 
4622   bool is_illegal = false;
4623 
4624   if (is_interface) {
4625     if (major_gte_8) {
4626       // Class file version is JAVA_8_VERSION or later Methods of
4627       // interfaces may set any of the flags except ACC_PROTECTED,
4628       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4629       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4630       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4631           (is_native || is_protected || is_final || is_synchronized) ||
4632           // If a specific method of a class or interface has its
4633           // ACC_ABSTRACT flag set, it must not have any of its
4634           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4635           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4636           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4637           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4638           (is_abstract && (is_private || is_static || is_strict))) {
4639         is_illegal = true;
4640       }
4641     } else if (major_gte_15) {
4642       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4643       if (!is_public || is_static || is_final || is_synchronized ||
4644           is_native || !is_abstract || is_strict) {
4645         is_illegal = true;
4646       }
4647     } else {
4648       // Class file version is pre-JAVA_1_5_VERSION
4649       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4650         is_illegal = true;
4651       }
4652     }
4653   } else { // not interface
4654     if (is_initializer) {
4655       if (is_static || is_final || is_synchronized || is_native ||
4656           is_abstract || (major_gte_15 && is_bridge)) {
4657         is_illegal = true;
4658       }
4659     } else { // not initializer
4660       if (is_abstract) {
4661         if ((is_final || is_native || is_private || is_static ||
4662             (major_gte_15 && (is_synchronized || is_strict)))) {
4663           is_illegal = true;
4664         }
4665       }
4666       if (has_illegal_visibility(flags)) {
4667         is_illegal = true;
4668       }
4669     }
4670   }
4671 
4672   if (is_illegal) {
4673     ResourceMark rm(THREAD);
4674     Exceptions::fthrow(
4675       THREAD_AND_LOCATION,
4676       vmSymbols::java_lang_ClassFormatError(),
4677       "Method %s in class %s has illegal modifiers: 0x%X",
4678       name->as_C_string(), _class_name->as_C_string(), flags);
4679     return;
4680   }
4681 }
4682 
4683 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4684   assert(_need_verify, "only called when _need_verify is true");
4685   int i = 0;
4686   int count = length >> 2;
4687   for (int k=0; k<count; k++) {
4688     unsigned char b0 = buffer[i];
4689     unsigned char b1 = buffer[i+1];
4690     unsigned char b2 = buffer[i+2];
4691     unsigned char b3 = buffer[i+3];
4692     // For an unsigned char v,
4693     // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4694     // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4695     unsigned char res = b0 | b0 - 1 |
4696                         b1 | b1 - 1 |
4697                         b2 | b2 - 1 |
4698                         b3 | b3 - 1;
4699     if (res >= 128) break;
4700     i += 4;
4701   }
4702   for(; i < length; i++) {
4703     unsigned short c;
4704     // no embedded zeros
4705     guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4706     if(buffer[i] < 128) {
4707       continue;
4708     }
4709     if ((i + 5) < length) { // see if it's legal supplementary character
4710       if (UTF8::is_supplementary_character(&buffer[i])) {
4711         c = UTF8::get_supplementary_character(&buffer[i]);
4712         i += 5;
4713         continue;
4714       }
4715     }
4716     switch (buffer[i] >> 4) {
4717       default: break;
4718       case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4719         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4720       case 0xC: case 0xD:  // 110xxxxx  10xxxxxx
4721         c = (buffer[i] & 0x1F) << 6;
4722         i++;
4723         if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4724           c += buffer[i] & 0x3F;
4725           if (_major_version <= 47 || c == 0 || c >= 0x80) {
4726             // for classes with major > 47, c must a null or a character in its shortest form
4727             break;
4728           }
4729         }
4730         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4731       case 0xE:  // 1110xxxx 10xxxxxx 10xxxxxx
4732         c = (buffer[i] & 0xF) << 12;
4733         i += 2;
4734         if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4735           c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4736           if (_major_version <= 47 || c >= 0x800) {
4737             // for classes with major > 47, c must be in its shortest form
4738             break;
4739           }
4740         }
4741         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4742     }  // end of switch
4743   } // end of for
4744 }
4745 
4746 // Checks if name is a legal class name.
4747 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
4748   if (!_need_verify || _relax_verify) { return; }
4749 
4750   char buf[fixed_buffer_size];
4751   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4752   unsigned int length = name->utf8_length();
4753   bool legal = false;
4754 
4755   if (length > 0) {
4756     char* p;
4757     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4758       p = skip_over_field_signature(bytes, false, length, CHECK);
4759       legal = (p != NULL) && ((p - bytes) == (int)length);
4760     } else if (_major_version < JAVA_1_5_VERSION) {
4761       if (bytes[0] != '<') {
4762         p = skip_over_field_name(bytes, true, length);
4763         legal = (p != NULL) && ((p - bytes) == (int)length);
4764       }
4765     } else {
4766       // 4900761: relax the constraints based on JSR202 spec
4767       // Class names may be drawn from the entire Unicode character set.
4768       // Identifiers between '/' must be unqualified names.
4769       // The utf8 string has been verified when parsing cpool entries.
4770       legal = verify_unqualified_name(bytes, length, LegalClass);
4771     }
4772   }
4773   if (!legal) {
4774     ResourceMark rm(THREAD);
4775     Exceptions::fthrow(
4776       THREAD_AND_LOCATION,
4777       vmSymbols::java_lang_ClassFormatError(),
4778       "Illegal class name \"%s\" in class file %s", bytes,
4779       _class_name->as_C_string()
4780     );
4781     return;
4782   }
4783 }
4784 
4785 // Checks if name is a legal field name.
4786 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
4787   if (!_need_verify || _relax_verify) { return; }
4788 
4789   char buf[fixed_buffer_size];
4790   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4791   unsigned int length = name->utf8_length();
4792   bool legal = false;
4793 
4794   if (length > 0) {
4795     if (_major_version < JAVA_1_5_VERSION) {
4796       if (bytes[0] != '<') {
4797         char* p = skip_over_field_name(bytes, false, length);
4798         legal = (p != NULL) && ((p - bytes) == (int)length);
4799       }
4800     } else {
4801       // 4881221: relax the constraints based on JSR202 spec
4802       legal = verify_unqualified_name(bytes, length, LegalField);
4803     }
4804   }
4805 
4806   if (!legal) {
4807     ResourceMark rm(THREAD);
4808     Exceptions::fthrow(
4809       THREAD_AND_LOCATION,
4810       vmSymbols::java_lang_ClassFormatError(),
4811       "Illegal field name \"%s\" in class %s", bytes,
4812       _class_name->as_C_string()
4813     );
4814     return;
4815   }
4816 }
4817 
4818 // Checks if name is a legal method name.
4819 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
4820   if (!_need_verify || _relax_verify) { return; }
4821 
4822   assert(name != NULL, "method name is null");
4823   char buf[fixed_buffer_size];
4824   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4825   unsigned int length = name->utf8_length();
4826   bool legal = false;
4827 
4828   if (length > 0) {
4829     if (bytes[0] == '<') {
4830       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4831         legal = true;
4832       }
4833     } else if (_major_version < JAVA_1_5_VERSION) {
4834       char* p;
4835       p = skip_over_field_name(bytes, false, length);
4836       legal = (p != NULL) && ((p - bytes) == (int)length);
4837     } else {
4838       // 4881221: relax the constraints based on JSR202 spec
4839       legal = verify_unqualified_name(bytes, length, LegalMethod);
4840     }
4841   }
4842 
4843   if (!legal) {
4844     ResourceMark rm(THREAD);
4845     Exceptions::fthrow(
4846       THREAD_AND_LOCATION,
4847       vmSymbols::java_lang_ClassFormatError(),
4848       "Illegal method name \"%s\" in class %s", bytes,
4849       _class_name->as_C_string()
4850     );
4851     return;
4852   }
4853 }
4854 
4855 
4856 // Checks if signature is a legal field signature.
4857 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
4858   if (!_need_verify) { return; }
4859 
4860   char buf[fixed_buffer_size];
4861   char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4862   unsigned int length = signature->utf8_length();
4863   char* p = skip_over_field_signature(bytes, false, length, CHECK);
4864 
4865   if (p == NULL || (p - bytes) != (int)length) {
4866     throwIllegalSignature("Field", name, signature, CHECK);
4867   }
4868 }
4869 
4870 // Checks if signature is a legal method signature.
4871 // Returns number of parameters
4872 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
4873   if (!_need_verify) {
4874     // make sure caller's args_size will be less than 0 even for non-static
4875     // method so it will be recomputed in compute_size_of_parameters().
4876     return -2;
4877   }
4878 
4879   unsigned int args_size = 0;
4880   char buf[fixed_buffer_size];
4881   char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4882   unsigned int length = signature->utf8_length();
4883   char* nextp;
4884 
4885   // The first character must be a '('
4886   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
4887     length--;
4888     // Skip over legal field signatures
4889     nextp = skip_over_field_signature(p, false, length, CHECK_0);
4890     while ((length > 0) && (nextp != NULL)) {
4891       args_size++;
4892       if (p[0] == 'J' || p[0] == 'D') {
4893         args_size++;
4894       }
4895       length -= nextp - p;
4896       p = nextp;
4897       nextp = skip_over_field_signature(p, false, length, CHECK_0);
4898     }
4899     // The first non-signature thing better be a ')'
4900     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4901       length--;
4902       if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
4903         // All internal methods must return void
4904         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
4905           return args_size;
4906         }
4907       } else {
4908         // Now we better just have a return value
4909         nextp = skip_over_field_signature(p, true, length, CHECK_0);
4910         if (nextp && ((int)length == (nextp - p))) {
4911           return args_size;
4912         }
4913       }
4914     }
4915   }
4916   // Report error
4917   throwIllegalSignature("Method", name, signature, CHECK_0);
4918   return 0;
4919 }
4920 
4921 
4922 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4923 // Method names also may not contain the characters '<' or '>', unless <init>
4924 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4925 // method.  Because these names have been checked as special cases before
4926 // calling this method in verify_legal_method_name.
4927 bool ClassFileParser::verify_unqualified_name(
4928     char* name, unsigned int length, int type) {
4929   jchar ch;
4930 
4931   for (char* p = name; p != name + length; ) {
4932     ch = *p;
4933     if (ch < 128) {
4934       p++;
4935       if (ch == '.' || ch == ';' || ch == '[' ) {
4936         return false;   // do not permit '.', ';', or '['
4937       }
4938       if (type != LegalClass && ch == '/') {
4939         return false;   // do not permit '/' unless it's class name
4940       }
4941       if (type == LegalMethod && (ch == '<' || ch == '>')) {
4942         return false;   // do not permit '<' or '>' in method names
4943       }
4944     } else {
4945       char* tmp_p = UTF8::next(p, &ch);
4946       p = tmp_p;
4947     }
4948   }
4949   return true;
4950 }
4951 
4952 
4953 // Take pointer to a string. Skip over the longest part of the string that could
4954 // be taken as a fieldname. Allow '/' if slash_ok is true.
4955 // Return a pointer to just past the fieldname.
4956 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4957 // being true, we saw consecutive slashes (meaning we were looking for a
4958 // qualified path but found something that was badly-formed).
4959 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
4960   char* p;
4961   jchar ch;
4962   jboolean last_is_slash = false;
4963   jboolean not_first_ch = false;
4964 
4965   for (p = name; p != name + length; not_first_ch = true) {
4966     char* old_p = p;
4967     ch = *p;
4968     if (ch < 128) {
4969       p++;
4970       // quick check for ascii
4971       if ((ch >= 'a' && ch <= 'z') ||
4972           (ch >= 'A' && ch <= 'Z') ||
4973           (ch == '_' || ch == '$') ||
4974           (not_first_ch && ch >= '0' && ch <= '9')) {
4975         last_is_slash = false;
4976         continue;
4977       }
4978       if (slash_ok && ch == '/') {
4979         if (last_is_slash) {
4980           return NULL;  // Don't permit consecutive slashes
4981         }
4982         last_is_slash = true;
4983         continue;
4984       }
4985     } else {
4986       jint unicode_ch;
4987       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4988       p = tmp_p;
4989       last_is_slash = false;
4990       // Check if ch is Java identifier start or is Java identifier part
4991       // 4672820: call java.lang.Character methods directly without generating separate tables.
4992       EXCEPTION_MARK;
4993       instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
4994 
4995       // return value
4996       JavaValue result(T_BOOLEAN);
4997       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4998       JavaCallArguments args;
4999       args.push_int(unicode_ch);
5000 
5001       // public static boolean isJavaIdentifierStart(char ch);
5002       JavaCalls::call_static(&result,
5003                              klass,
5004                              vmSymbols::isJavaIdentifierStart_name(),
5005                              vmSymbols::int_bool_signature(),
5006                              &args,
5007                              THREAD);
5008 
5009       if (HAS_PENDING_EXCEPTION) {
5010         CLEAR_PENDING_EXCEPTION;
5011         return 0;
5012       }
5013       if (result.get_jboolean()) {
5014         continue;
5015       }
5016 
5017       if (not_first_ch) {
5018         // public static boolean isJavaIdentifierPart(char ch);
5019         JavaCalls::call_static(&result,
5020                                klass,
5021                                vmSymbols::isJavaIdentifierPart_name(),
5022                                vmSymbols::int_bool_signature(),
5023                                &args,
5024                                THREAD);
5025 
5026         if (HAS_PENDING_EXCEPTION) {
5027           CLEAR_PENDING_EXCEPTION;
5028           return 0;
5029         }
5030 
5031         if (result.get_jboolean()) {
5032           continue;
5033         }
5034       }
5035     }
5036     return (not_first_ch) ? old_p : NULL;
5037   }
5038   return (not_first_ch) ? p : NULL;
5039 }
5040 
5041 
5042 // Take pointer to a string. Skip over the longest part of the string that could
5043 // be taken as a field signature. Allow "void" if void_ok.
5044 // Return a pointer to just past the signature.
5045 // Return NULL if no legal signature is found.
5046 char* ClassFileParser::skip_over_field_signature(char* signature,
5047                                                  bool void_ok,
5048                                                  unsigned int length,
5049                                                  TRAPS) {
5050   unsigned int array_dim = 0;
5051   while (length > 0) {
5052     switch (signature[0]) {
5053       case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5054       case JVM_SIGNATURE_BOOLEAN:
5055       case JVM_SIGNATURE_BYTE:
5056       case JVM_SIGNATURE_CHAR:
5057       case JVM_SIGNATURE_SHORT:
5058       case JVM_SIGNATURE_INT:
5059       case JVM_SIGNATURE_FLOAT:
5060       case JVM_SIGNATURE_LONG:
5061       case JVM_SIGNATURE_DOUBLE:
5062         return signature + 1;
5063       case JVM_SIGNATURE_CLASS: {
5064         if (_major_version < JAVA_1_5_VERSION) {
5065           // Skip over the class name if one is there
5066           char* p = skip_over_field_name(signature + 1, true, --length);
5067 
5068           // The next character better be a semicolon
5069           if (p && (p - signature) > 1 && p[0] == ';') {
5070             return p + 1;
5071           }
5072         } else {
5073           // 4900761: For class version > 48, any unicode is allowed in class name.
5074           length--;
5075           signature++;
5076           while (length > 0 && signature[0] != ';') {
5077             if (signature[0] == '.') {
5078               classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5079             }
5080             length--;
5081             signature++;
5082           }
5083           if (signature[0] == ';') { return signature + 1; }
5084         }
5085 
5086         return NULL;
5087       }
5088       case JVM_SIGNATURE_ARRAY:
5089         array_dim++;
5090         if (array_dim > 255) {
5091           // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5092           classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5093         }
5094         // The rest of what's there better be a legal signature
5095         signature++;
5096         length--;
5097         void_ok = false;
5098         break;
5099 
5100       default:
5101         return NULL;
5102     }
5103   }
5104   return NULL;
5105 }