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