1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classFileParser.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.inline.hpp"
  29 #include "classfile/defaultMethods.hpp"
  30 #include "classfile/javaClasses.inline.hpp"
  31 #include "classfile/symbolTable.hpp"
  32 #include "classfile/systemDictionary.hpp"
  33 #include "classfile/verificationType.hpp"
  34 #include "classfile/verifier.hpp"
  35 #include "classfile/vmSymbols.hpp"
  36 #include "gc/shared/gcLocker.hpp"
  37 #include "memory/allocation.hpp"
  38 #include "memory/metadataFactory.hpp"
  39 #include "memory/oopFactory.hpp"
  40 #include "memory/referenceType.hpp"
  41 #include "memory/resourceArea.hpp"
  42 #include "memory/universe.inline.hpp"
  43 #include "oops/constantPool.hpp"
  44 #include "oops/fieldStreams.hpp"
  45 #include "oops/instanceKlass.hpp"
  46 #include "oops/instanceMirrorKlass.hpp"
  47 #include "oops/klass.inline.hpp"
  48 #include "oops/klassVtable.hpp"
  49 #include "oops/method.hpp"
  50 #include "oops/symbol.hpp"
  51 #include "prims/jvm.h"
  52 #include "prims/jvmtiExport.hpp"
  53 #include "prims/jvmtiThreadState.hpp"
  54 #include "runtime/javaCalls.hpp"
  55 #include "runtime/perfData.hpp"
  56 #include "runtime/reflection.hpp"
  57 #include "runtime/signature.hpp"
  58 #include "runtime/timer.hpp"
  59 #include "services/classLoadingService.hpp"
  60 #include "services/threadService.hpp"
  61 #include "utilities/array.hpp"
  62 #include "utilities/exceptions.hpp"
  63 #include "utilities/globalDefinitions.hpp"
  64 #include "utilities/macros.hpp"
  65 #include "utilities/ostream.hpp"
  66 #include "utilities/resourceHash.hpp"
  67 #if INCLUDE_CDS
  68 #include "classfile/systemDictionaryShared.hpp"
  69 #endif
  70 
  71 // We generally try to create the oops directly when parsing, rather than
  72 // allocating temporary data structures and copying the bytes twice. A
  73 // temporary area is only needed when parsing utf8 entries in the constant
  74 // pool and when parsing line number tables.
  75 
  76 // We add assert in debug mode when class format is not checked.
  77 
  78 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
  79 #define JAVA_MIN_SUPPORTED_VERSION        45
  80 #define JAVA_MAX_SUPPORTED_VERSION        52
  81 #define JAVA_MAX_SUPPORTED_MINOR_VERSION  0
  82 
  83 // Used for two backward compatibility reasons:
  84 // - to check for new additions to the class file format in JDK1.5
  85 // - to check for bug fixes in the format checker in JDK1.5
  86 #define JAVA_1_5_VERSION                  49
  87 
  88 // Used for backward compatibility reasons:
  89 // - to check for javac bug fixes that happened after 1.5
  90 // - also used as the max version when running in jdk6
  91 #define JAVA_6_VERSION                    50
  92 
  93 // Used for backward compatibility reasons:
  94 // - to check NameAndType_info signatures more aggressively
  95 // - to disallow argument and require ACC_STATIC for <clinit> methods
  96 #define JAVA_7_VERSION                    51
  97 
  98 // Extension method support.
  99 #define JAVA_8_VERSION                    52
 100 
 101 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) {
 102   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 103   // this function (_current can be allocated in a register, with scalar
 104   // replacement of aggregates). The _current pointer is copied back to
 105   // stream() when this function returns. DON'T call another method within
 106   // this method that uses stream().
 107   ClassFileStream* cfs0 = stream();
 108   ClassFileStream cfs1 = *cfs0;
 109   ClassFileStream* cfs = &cfs1;
 110 #ifdef ASSERT
 111   assert(cfs->allocated_on_stack(),"should be local");
 112   u1* old_current = cfs0->current();
 113 #endif
 114   Handle class_loader(THREAD, _loader_data->class_loader());
 115 
 116   // Used for batching symbol allocations.
 117   const char* names[SymbolTable::symbol_alloc_batch_size];
 118   int lengths[SymbolTable::symbol_alloc_batch_size];
 119   int indices[SymbolTable::symbol_alloc_batch_size];
 120   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 121   int names_count = 0;
 122 
 123   // parsing  Index 0 is unused
 124   for (int index = 1; index < length; index++) {
 125     // Each of the following case guarantees one more byte in the stream
 126     // for the following tag or the access_flags following constant pool,
 127     // so we don't need bounds-check for reading tag.
 128     u1 tag = cfs->get_u1_fast();
 129     switch (tag) {
 130       case JVM_CONSTANT_Class :
 131         {
 132           cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 133           u2 name_index = cfs->get_u2_fast();
 134           _cp->klass_index_at_put(index, name_index);
 135         }
 136         break;
 137       case JVM_CONSTANT_Fieldref :
 138         {
 139           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 140           u2 class_index = cfs->get_u2_fast();
 141           u2 name_and_type_index = cfs->get_u2_fast();
 142           _cp->field_at_put(index, class_index, name_and_type_index);
 143         }
 144         break;
 145       case JVM_CONSTANT_Methodref :
 146         {
 147           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 148           u2 class_index = cfs->get_u2_fast();
 149           u2 name_and_type_index = cfs->get_u2_fast();
 150           _cp->method_at_put(index, class_index, name_and_type_index);
 151         }
 152         break;
 153       case JVM_CONSTANT_InterfaceMethodref :
 154         {
 155           cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 156           u2 class_index = cfs->get_u2_fast();
 157           u2 name_and_type_index = cfs->get_u2_fast();
 158           _cp->interface_method_at_put(index, class_index, name_and_type_index);
 159         }
 160         break;
 161       case JVM_CONSTANT_String :
 162         {
 163           cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 164           u2 string_index = cfs->get_u2_fast();
 165           _cp->string_index_at_put(index, string_index);
 166         }
 167         break;
 168       case JVM_CONSTANT_MethodHandle :
 169       case JVM_CONSTANT_MethodType :
 170         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 171           classfile_parse_error(
 172             "Class file version does not support constant tag %u in class file %s",
 173             tag, CHECK);
 174         }
 175         if (tag == JVM_CONSTANT_MethodHandle) {
 176           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 177           u1 ref_kind = cfs->get_u1_fast();
 178           u2 method_index = cfs->get_u2_fast();
 179           _cp->method_handle_index_at_put(index, ref_kind, method_index);
 180         } else if (tag == JVM_CONSTANT_MethodType) {
 181           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 182           u2 signature_index = cfs->get_u2_fast();
 183           _cp->method_type_index_at_put(index, signature_index);
 184         } else {
 185           ShouldNotReachHere();
 186         }
 187         break;
 188       case JVM_CONSTANT_InvokeDynamic :
 189         {
 190           if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 191             classfile_parse_error(
 192               "Class file version does not support constant tag %u in class file %s",
 193               tag, CHECK);
 194           }
 195           cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 196           u2 bootstrap_specifier_index = cfs->get_u2_fast();
 197           u2 name_and_type_index = cfs->get_u2_fast();
 198           if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index)
 199             _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 200           _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 201         }
 202         break;
 203       case JVM_CONSTANT_Integer :
 204         {
 205           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 206           u4 bytes = cfs->get_u4_fast();
 207           _cp->int_at_put(index, (jint) bytes);
 208         }
 209         break;
 210       case JVM_CONSTANT_Float :
 211         {
 212           cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 213           u4 bytes = cfs->get_u4_fast();
 214           _cp->float_at_put(index, *(jfloat*)&bytes);
 215         }
 216         break;
 217       case JVM_CONSTANT_Long :
 218         // A mangled type might cause you to overrun allocated memory
 219         guarantee_property(index+1 < length,
 220                            "Invalid constant pool entry %u in class file %s",
 221                            index, CHECK);
 222         {
 223           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 224           u8 bytes = cfs->get_u8_fast();
 225           _cp->long_at_put(index, bytes);
 226         }
 227         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 228         break;
 229       case JVM_CONSTANT_Double :
 230         // A mangled type might cause you to overrun allocated memory
 231         guarantee_property(index+1 < length,
 232                            "Invalid constant pool entry %u in class file %s",
 233                            index, CHECK);
 234         {
 235           cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 236           u8 bytes = cfs->get_u8_fast();
 237           _cp->double_at_put(index, *(jdouble*)&bytes);
 238         }
 239         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 240         break;
 241       case JVM_CONSTANT_NameAndType :
 242         {
 243           cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 244           u2 name_index = cfs->get_u2_fast();
 245           u2 signature_index = cfs->get_u2_fast();
 246           _cp->name_and_type_at_put(index, name_index, signature_index);
 247         }
 248         break;
 249       case JVM_CONSTANT_Utf8 :
 250         {
 251           cfs->guarantee_more(2, CHECK);  // utf8_length
 252           u2  utf8_length = cfs->get_u2_fast();
 253           u1* utf8_buffer = cfs->get_u1_buffer();
 254           assert(utf8_buffer != NULL, "null utf8 buffer");
 255           // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 256           cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 257           cfs->skip_u1_fast(utf8_length);
 258 
 259           // Before storing the symbol, make sure it's legal
 260           if (_need_verify) {
 261             verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK);
 262           }
 263 
 264           if (has_cp_patch_at(index)) {
 265             Handle patch = clear_cp_patch_at(index);
 266             guarantee_property(java_lang_String::is_instance(patch()),
 267                                "Illegal utf8 patch at %d in class file %s",
 268                                index, CHECK);
 269             char* str = java_lang_String::as_utf8_string(patch());
 270             // (could use java_lang_String::as_symbol instead, but might as well batch them)
 271             utf8_buffer = (u1*) str;
 272             utf8_length = (int) strlen(str);
 273           }
 274 
 275           unsigned int hash;
 276           Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash);
 277           if (result == NULL) {
 278             names[names_count] = (char*)utf8_buffer;
 279             lengths[names_count] = utf8_length;
 280             indices[names_count] = index;
 281             hashValues[names_count++] = hash;
 282             if (names_count == SymbolTable::symbol_alloc_batch_size) {
 283               SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
 284               names_count = 0;
 285             }
 286           } else {
 287             _cp->symbol_at_put(index, result);
 288           }
 289         }
 290         break;
 291       default:
 292         classfile_parse_error(
 293           "Unknown constant tag %u in class file %s", tag, CHECK);
 294         break;
 295     }
 296   }
 297 
 298   // Allocate the remaining symbols
 299   if (names_count > 0) {
 300     SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK);
 301   }
 302 
 303   // Copy _current pointer of local copy back to stream().
 304 #ifdef ASSERT
 305   assert(cfs0->current() == old_current, "non-exclusive use of stream()");
 306 #endif
 307   cfs0->set_current(cfs1.current());
 308 }
 309 
 310 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); }
 311 
 312 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) {
 313   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8())
 314     return cp->symbol_at(index);
 315   else
 316     return NULL;
 317 }
 318 
 319 #ifdef ASSERT
 320 PRAGMA_DIAG_PUSH
 321 PRAGMA_FORMAT_NONLITERAL_IGNORED
 322 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) {
 323   ResourceMark rm(THREAD);
 324   fatal(msg, _class_name->as_C_string());
 325 }
 326 
 327 void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) {
 328   ResourceMark rm(THREAD);
 329   fatal(msg, index, _class_name->as_C_string());
 330 }
 331 PRAGMA_DIAG_POP
 332 #endif
 333 
 334 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) {
 335   ClassFileStream* cfs = stream();
 336   constantPoolHandle nullHandle;
 337 
 338   cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag
 339   u2 length = cfs->get_u2_fast();
 340   guarantee_property(
 341     length >= 1, "Illegal constant pool size %u in class file %s",
 342     length, CHECK_(nullHandle));
 343   ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length,
 344                                                         CHECK_(nullHandle));
 345   _cp = constant_pool; // save in case of errors
 346   constantPoolHandle cp (THREAD, constant_pool);
 347 
 348   // parsing constant pool entries
 349   parse_constant_pool_entries(length, CHECK_(nullHandle));
 350 
 351   int index = 1;  // declared outside of loops for portability
 352 
 353   // first verification pass - validate cross references and fixup class and string constants
 354   for (index = 1; index < length; index++) {          // Index 0 is unused
 355     jbyte tag = cp->tag_at(index).value();
 356     switch (tag) {
 357       case JVM_CONSTANT_Class :
 358         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 359         break;
 360       case JVM_CONSTANT_Fieldref :
 361         // fall through
 362       case JVM_CONSTANT_Methodref :
 363         // fall through
 364       case JVM_CONSTANT_InterfaceMethodref : {
 365         if (!_need_verify) break;
 366         int klass_ref_index = cp->klass_ref_index_at(index);
 367         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 368         check_property(valid_klass_reference_at(klass_ref_index),
 369                        "Invalid constant pool index %u in class file %s",
 370                        klass_ref_index,
 371                        CHECK_(nullHandle));
 372         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 373                        cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 374                        "Invalid constant pool index %u in class file %s",
 375                        name_and_type_ref_index,
 376                        CHECK_(nullHandle));
 377         break;
 378       }
 379       case JVM_CONSTANT_String :
 380         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 381         break;
 382       case JVM_CONSTANT_Integer :
 383         break;
 384       case JVM_CONSTANT_Float :
 385         break;
 386       case JVM_CONSTANT_Long :
 387       case JVM_CONSTANT_Double :
 388         index++;
 389         check_property(
 390           (index < length && cp->tag_at(index).is_invalid()),
 391           "Improper constant pool long/double index %u in class file %s",
 392           index, CHECK_(nullHandle));
 393         break;
 394       case JVM_CONSTANT_NameAndType : {
 395         if (!_need_verify) break;
 396         int name_ref_index = cp->name_ref_index_at(index);
 397         int signature_ref_index = cp->signature_ref_index_at(index);
 398         check_property(valid_symbol_at(name_ref_index),
 399                  "Invalid constant pool index %u in class file %s",
 400                  name_ref_index, CHECK_(nullHandle));
 401         check_property(valid_symbol_at(signature_ref_index),
 402                  "Invalid constant pool index %u in class file %s",
 403                  signature_ref_index, CHECK_(nullHandle));
 404         break;
 405       }
 406       case JVM_CONSTANT_Utf8 :
 407         break;
 408       case JVM_CONSTANT_UnresolvedClass :         // fall-through
 409       case JVM_CONSTANT_UnresolvedClassInError:
 410         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 411         break;
 412       case JVM_CONSTANT_ClassIndex :
 413         {
 414           int class_index = cp->klass_index_at(index);
 415           check_property(valid_symbol_at(class_index),
 416                  "Invalid constant pool index %u in class file %s",
 417                  class_index, CHECK_(nullHandle));
 418           cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
 419         }
 420         break;
 421       case JVM_CONSTANT_StringIndex :
 422         {
 423           int string_index = cp->string_index_at(index);
 424           check_property(valid_symbol_at(string_index),
 425                  "Invalid constant pool index %u in class file %s",
 426                  string_index, CHECK_(nullHandle));
 427           Symbol* sym = cp->symbol_at(string_index);
 428           cp->unresolved_string_at_put(index, sym);
 429         }
 430         break;
 431       case JVM_CONSTANT_MethodHandle :
 432         {
 433           int ref_index = cp->method_handle_index_at(index);
 434           check_property(
 435             valid_cp_range(ref_index, length),
 436               "Invalid constant pool index %u in class file %s",
 437               ref_index, CHECK_(nullHandle));
 438           constantTag tag = cp->tag_at(ref_index);
 439           int ref_kind  = cp->method_handle_ref_kind_at(index);
 440           switch (ref_kind) {
 441           case JVM_REF_getField:
 442           case JVM_REF_getStatic:
 443           case JVM_REF_putField:
 444           case JVM_REF_putStatic:
 445             check_property(
 446               tag.is_field(),
 447               "Invalid constant pool index %u in class file %s (not a field)",
 448               ref_index, CHECK_(nullHandle));
 449             break;
 450           case JVM_REF_invokeVirtual:
 451           case JVM_REF_newInvokeSpecial:
 452             check_property(
 453               tag.is_method(),
 454               "Invalid constant pool index %u in class file %s (not a method)",
 455               ref_index, CHECK_(nullHandle));
 456             break;
 457           case JVM_REF_invokeStatic:
 458           case JVM_REF_invokeSpecial:
 459             check_property(tag.is_method() ||
 460                            ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 461                "Invalid constant pool index %u in class file %s (not a method)",
 462                ref_index, CHECK_(nullHandle));
 463              break;
 464           case JVM_REF_invokeInterface:
 465             check_property(
 466               tag.is_interface_method(),
 467               "Invalid constant pool index %u in class file %s (not an interface method)",
 468               ref_index, CHECK_(nullHandle));
 469             break;
 470           default:
 471             classfile_parse_error(
 472               "Bad method handle kind at constant pool index %u in class file %s",
 473               index, CHECK_(nullHandle));
 474           }
 475           // Keep the ref_index unchanged.  It will be indirected at link-time.
 476         }
 477         break;
 478       case JVM_CONSTANT_MethodType :
 479         {
 480           int ref_index = cp->method_type_index_at(index);
 481           check_property(valid_symbol_at(ref_index),
 482                  "Invalid constant pool index %u in class file %s",
 483                  ref_index, CHECK_(nullHandle));
 484         }
 485         break;
 486       case JVM_CONSTANT_InvokeDynamic :
 487         {
 488           int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index);
 489           check_property(valid_cp_range(name_and_type_ref_index, length) &&
 490                          cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 491                          "Invalid constant pool index %u in class file %s",
 492                          name_and_type_ref_index,
 493                          CHECK_(nullHandle));
 494           // bootstrap specifier index must be checked later, when BootstrapMethods attr is available
 495           break;
 496         }
 497       default:
 498         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 499         ShouldNotReachHere();
 500         break;
 501     } // end of switch
 502   } // end of for
 503 
 504   if (_cp_patches != NULL) {
 505     // need to treat this_class specially...
 506     int this_class_index;
 507     {
 508       cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
 509       u1* mark = cfs->current();
 510       u2 flags         = cfs->get_u2_fast();
 511       this_class_index = cfs->get_u2_fast();
 512       cfs->set_current(mark);  // revert to mark
 513     }
 514 
 515     for (index = 1; index < length; index++) {          // Index 0 is unused
 516       if (has_cp_patch_at(index)) {
 517         guarantee_property(index != this_class_index,
 518                            "Illegal constant pool patch to self at %d in class file %s",
 519                            index, CHECK_(nullHandle));
 520         patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle));
 521       }
 522     }
 523   }
 524 
 525   if (!_need_verify) {
 526     return cp;
 527   }
 528 
 529   // second verification pass - checks the strings are of the right format.
 530   // but not yet to the other entries
 531   for (index = 1; index < length; index++) {
 532     jbyte tag = cp->tag_at(index).value();
 533     switch (tag) {
 534       case JVM_CONSTANT_UnresolvedClass: {
 535         Symbol*  class_name = cp->klass_name_at(index);
 536         // check the name, even if _cp_patches will overwrite it
 537         verify_legal_class_name(class_name, CHECK_(nullHandle));
 538         break;
 539       }
 540       case JVM_CONSTANT_NameAndType: {
 541         if (_need_verify && _major_version >= JAVA_7_VERSION) {
 542           int sig_index = cp->signature_ref_index_at(index);
 543           int name_index = cp->name_ref_index_at(index);
 544           Symbol*  name = cp->symbol_at(name_index);
 545           Symbol*  sig = cp->symbol_at(sig_index);
 546           if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
 547             verify_legal_method_signature(name, sig, CHECK_(nullHandle));
 548           } else {
 549             verify_legal_field_signature(name, sig, CHECK_(nullHandle));
 550           }
 551         }
 552         break;
 553       }
 554       case JVM_CONSTANT_InvokeDynamic:
 555       case JVM_CONSTANT_Fieldref:
 556       case JVM_CONSTANT_Methodref:
 557       case JVM_CONSTANT_InterfaceMethodref: {
 558         int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 559         // already verified to be utf8
 560         int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 561         // already verified to be utf8
 562         int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index);
 563         Symbol*  name = cp->symbol_at(name_ref_index);
 564         Symbol*  signature = cp->symbol_at(signature_ref_index);
 565         if (tag == JVM_CONSTANT_Fieldref) {
 566           verify_legal_field_name(name, CHECK_(nullHandle));
 567           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 568             // Signature is verified above, when iterating NameAndType_info.
 569             // Need only to be sure it's the right type.
 570             if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
 571               throwIllegalSignature(
 572                   "Field", name, signature, CHECK_(nullHandle));
 573             }
 574           } else {
 575             verify_legal_field_signature(name, signature, CHECK_(nullHandle));
 576           }
 577         } else {
 578           verify_legal_method_name(name, CHECK_(nullHandle));
 579           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 580             // Signature is verified above, when iterating NameAndType_info.
 581             // Need only to be sure it's the right type.
 582             if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
 583               throwIllegalSignature(
 584                   "Method", name, signature, CHECK_(nullHandle));
 585             }
 586           } else {
 587             verify_legal_method_signature(name, signature, CHECK_(nullHandle));
 588           }
 589           if (tag == JVM_CONSTANT_Methodref) {
 590             // 4509014: If a class method name begins with '<', it must be "<init>".
 591             assert(name != NULL, "method name in constant pool is null");
 592             unsigned int name_len = name->utf8_length();
 593             assert(name_len > 0, "bad method name");  // already verified as legal name
 594             if (name->byte_at(0) == '<') {
 595               if (name != vmSymbols::object_initializer_name()) {
 596                 classfile_parse_error(
 597                   "Bad method name at constant pool index %u in class file %s",
 598                   name_ref_index, CHECK_(nullHandle));
 599               }
 600             }
 601           }
 602         }
 603         break;
 604       }
 605       case JVM_CONSTANT_MethodHandle: {
 606         int ref_index = cp->method_handle_index_at(index);
 607         int ref_kind  = cp->method_handle_ref_kind_at(index);
 608         switch (ref_kind) {
 609         case JVM_REF_invokeVirtual:
 610         case JVM_REF_invokeStatic:
 611         case JVM_REF_invokeSpecial:
 612         case JVM_REF_newInvokeSpecial:
 613           {
 614             int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index);
 615             int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index);
 616             Symbol*  name = cp->symbol_at(name_ref_index);
 617             if (ref_kind == JVM_REF_newInvokeSpecial) {
 618               if (name != vmSymbols::object_initializer_name()) {
 619                 classfile_parse_error(
 620                   "Bad constructor name at constant pool index %u in class file %s",
 621                   name_ref_index, CHECK_(nullHandle));
 622               }
 623             } else {
 624               if (name == vmSymbols::object_initializer_name()) {
 625                 classfile_parse_error(
 626                   "Bad method name at constant pool index %u in class file %s",
 627                   name_ref_index, CHECK_(nullHandle));
 628               }
 629             }
 630           }
 631           break;
 632           // Other ref_kinds are already fully checked in previous pass.
 633         }
 634         break;
 635       }
 636       case JVM_CONSTANT_MethodType: {
 637         Symbol* no_name = vmSymbols::type_name(); // place holder
 638         Symbol*  signature = cp->method_type_signature_at(index);
 639         verify_legal_method_signature(no_name, signature, CHECK_(nullHandle));
 640         break;
 641       }
 642       case JVM_CONSTANT_Utf8: {
 643         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 644       }
 645     }  // end of switch
 646   }  // end of for
 647 
 648   return cp;
 649 }
 650 
 651 
 652 void ClassFileParser::patch_constant_pool(const constantPoolHandle& cp, int index, Handle patch, TRAPS) {
 653   BasicType patch_type = T_VOID;
 654 
 655   switch (cp->tag_at(index).value()) {
 656 
 657   case JVM_CONSTANT_UnresolvedClass :
 658     // Patching a class means pre-resolving it.
 659     // The name in the constant pool is ignored.
 660     if (java_lang_Class::is_instance(patch())) {
 661       guarantee_property(!java_lang_Class::is_primitive(patch()),
 662                          "Illegal class patch at %d in class file %s",
 663                          index, CHECK);
 664       cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
 665     } else {
 666       guarantee_property(java_lang_String::is_instance(patch()),
 667                          "Illegal class patch at %d in class file %s",
 668                          index, CHECK);
 669       Symbol* name = java_lang_String::as_symbol(patch(), CHECK);
 670       cp->unresolved_klass_at_put(index, name);
 671     }
 672     break;
 673 
 674   case JVM_CONSTANT_String :
 675     // skip this patch and don't clear it.  Needs the oop array for resolved
 676     // references to be created first.
 677     return;
 678 
 679   case JVM_CONSTANT_Integer : patch_type = T_INT;    goto patch_prim;
 680   case JVM_CONSTANT_Float :   patch_type = T_FLOAT;  goto patch_prim;
 681   case JVM_CONSTANT_Long :    patch_type = T_LONG;   goto patch_prim;
 682   case JVM_CONSTANT_Double :  patch_type = T_DOUBLE; goto patch_prim;
 683   patch_prim:
 684     {
 685       jvalue value;
 686       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 687       guarantee_property(value_type == patch_type,
 688                          "Illegal primitive patch at %d in class file %s",
 689                          index, CHECK);
 690       switch (value_type) {
 691       case T_INT:    cp->int_at_put(index,   value.i); break;
 692       case T_FLOAT:  cp->float_at_put(index, value.f); break;
 693       case T_LONG:   cp->long_at_put(index,  value.j); break;
 694       case T_DOUBLE: cp->double_at_put(index, value.d); break;
 695       default:       assert(false, "");
 696       }
 697     }
 698     break;
 699 
 700   default:
 701     // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 702     guarantee_property(!has_cp_patch_at(index),
 703                        "Illegal unexpected patch at %d in class file %s",
 704                        index, CHECK);
 705     return;
 706   }
 707 
 708   // On fall-through, mark the patch as used.
 709   clear_cp_patch_at(index);
 710 }
 711 
 712 
 713 class NameSigHash: public ResourceObj {
 714  public:
 715   Symbol*       _name;       // name
 716   Symbol*       _sig;        // signature
 717   NameSigHash*  _next;       // Next entry in hash table
 718 };
 719 
 720 
 721 #define HASH_ROW_SIZE 256
 722 
 723 unsigned int hash(Symbol* name, Symbol* sig) {
 724   unsigned int raw_hash = 0;
 725   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 726   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 727 
 728   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 729 }
 730 
 731 
 732 void initialize_hashtable(NameSigHash** table) {
 733   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 734 }
 735 
 736 // Return false if the name/sig combination is found in table.
 737 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 738 // The old format checker uses heap sort to find duplicates.
 739 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 740 // of table since we don't expect Symbol*'s to move.
 741 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) {
 742   assert(name != NULL, "name in constant pool is NULL");
 743 
 744   // First lookup for duplicates
 745   int index = hash(name, sig);
 746   NameSigHash* entry = table[index];
 747   while (entry != NULL) {
 748     if (entry->_name == name && entry->_sig == sig) {
 749       return false;
 750     }
 751     entry = entry->_next;
 752   }
 753 
 754   // No duplicate is found, allocate a new entry and fill it.
 755   entry = new NameSigHash();
 756   entry->_name = name;
 757   entry->_sig = sig;
 758 
 759   // Insert into hash table
 760   entry->_next = table[index];
 761   table[index] = entry;
 762 
 763   return true;
 764 }
 765 
 766 
 767 Array<Klass*>* ClassFileParser::parse_interfaces(int length,
 768                                                  Handle protection_domain,
 769                                                  Symbol* class_name,
 770                                                  bool* has_default_methods,
 771                                                  TRAPS) {
 772   if (length == 0) {
 773     _local_interfaces = Universe::the_empty_klass_array();
 774   } else {
 775     ClassFileStream* cfs = stream();
 776     assert(length > 0, "only called for length>0");
 777     _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL);
 778 
 779     int index;
 780     for (index = 0; index < length; index++) {
 781       u2 interface_index = cfs->get_u2(CHECK_NULL);
 782       KlassHandle interf;
 783       check_property(
 784         valid_klass_reference_at(interface_index),
 785         "Interface name has bad constant pool index %u in class file %s",
 786         interface_index, CHECK_NULL);
 787       if (_cp->tag_at(interface_index).is_klass()) {
 788         interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index));
 789       } else {
 790         Symbol*  unresolved_klass  = _cp->klass_name_at(interface_index);
 791 
 792         // Don't need to check legal name because it's checked when parsing constant pool.
 793         // But need to make sure it's not an array type.
 794         guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 795                            "Bad interface name in class file %s", CHECK_NULL);
 796         Handle class_loader(THREAD, _loader_data->class_loader());
 797 
 798         // Call resolve_super so classcircularity is checked
 799         Klass* k = SystemDictionary::resolve_super_or_fail(class_name,
 800                       unresolved_klass, class_loader, protection_domain,
 801                       false, CHECK_NULL);
 802         interf = KlassHandle(THREAD, k);
 803       }
 804 
 805       if (!interf()->is_interface()) {
 806         THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL);
 807       }
 808       if (InstanceKlass::cast(interf())->has_default_methods()) {
 809         *has_default_methods = true;
 810       }
 811       _local_interfaces->at_put(index, interf());
 812     }
 813 
 814     if (!_need_verify || length <= 1) {
 815       return _local_interfaces;
 816     }
 817 
 818     // Check if there's any duplicates in interfaces
 819     ResourceMark rm(THREAD);
 820     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(
 821       THREAD, NameSigHash*, HASH_ROW_SIZE);
 822     initialize_hashtable(interface_names);
 823     bool dup = false;
 824     {
 825       debug_only(No_Safepoint_Verifier nsv;)
 826       for (index = 0; index < length; index++) {
 827         Klass* k = _local_interfaces->at(index);
 828         Symbol* name = k->name();
 829         // If no duplicates, add (name, NULL) in hashtable interface_names.
 830         if (!put_after_lookup(name, NULL, interface_names)) {
 831           dup = true;
 832           break;
 833         }
 834       }
 835     }
 836     if (dup) {
 837       classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL);
 838     }
 839   }
 840   return _local_interfaces;
 841 }
 842 
 843 
 844 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) {
 845   // Make sure the constant pool entry is of a type appropriate to this field
 846   guarantee_property(
 847     (constantvalue_index > 0 &&
 848       constantvalue_index < _cp->length()),
 849     "Bad initial value index %u in ConstantValue attribute in class file %s",
 850     constantvalue_index, CHECK);
 851   constantTag value_type = _cp->tag_at(constantvalue_index);
 852   switch ( _cp->basic_type_for_signature_at(signature_index) ) {
 853     case T_LONG:
 854       guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK);
 855       break;
 856     case T_FLOAT:
 857       guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK);
 858       break;
 859     case T_DOUBLE:
 860       guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK);
 861       break;
 862     case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT:
 863       guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK);
 864       break;
 865     case T_OBJECT:
 866       guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 867                          && value_type.is_string()),
 868                          "Bad string initial value in class file %s", CHECK);
 869       break;
 870     default:
 871       classfile_parse_error(
 872         "Unable to set initial value %u in class file %s",
 873         constantvalue_index, CHECK);
 874   }
 875 }
 876 
 877 
 878 // Parse attributes for a field.
 879 void ClassFileParser::parse_field_attributes(u2 attributes_count,
 880                                              bool is_static, u2 signature_index,
 881                                              u2* constantvalue_index_addr,
 882                                              bool* is_synthetic_addr,
 883                                              u2* generic_signature_index_addr,
 884                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
 885                                              TRAPS) {
 886   ClassFileStream* cfs = stream();
 887   assert(attributes_count > 0, "length should be greater than 0");
 888   u2 constantvalue_index = 0;
 889   u2 generic_signature_index = 0;
 890   bool is_synthetic = false;
 891   u1* runtime_visible_annotations = NULL;
 892   int runtime_visible_annotations_length = 0;
 893   u1* runtime_invisible_annotations = NULL;
 894   int runtime_invisible_annotations_length = 0;
 895   u1* runtime_visible_type_annotations = NULL;
 896   int runtime_visible_type_annotations_length = 0;
 897   u1* runtime_invisible_type_annotations = NULL;
 898   int runtime_invisible_type_annotations_length = 0;
 899   bool runtime_invisible_annotations_exists = false;
 900   bool runtime_invisible_type_annotations_exists = false;
 901   while (attributes_count--) {
 902     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
 903     u2 attribute_name_index = cfs->get_u2_fast();
 904     u4 attribute_length = cfs->get_u4_fast();
 905     check_property(valid_symbol_at(attribute_name_index),
 906                    "Invalid field attribute index %u in class file %s",
 907                    attribute_name_index,
 908                    CHECK);
 909     Symbol* attribute_name = _cp->symbol_at(attribute_name_index);
 910     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
 911       // ignore if non-static
 912       if (constantvalue_index != 0) {
 913         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
 914       }
 915       check_property(
 916         attribute_length == 2,
 917         "Invalid ConstantValue field attribute length %u in class file %s",
 918         attribute_length, CHECK);
 919       constantvalue_index = cfs->get_u2(CHECK);
 920       if (_need_verify) {
 921         verify_constantvalue(constantvalue_index, signature_index, CHECK);
 922       }
 923     } else if (attribute_name == vmSymbols::tag_synthetic()) {
 924       if (attribute_length != 0) {
 925         classfile_parse_error(
 926           "Invalid Synthetic field attribute length %u in class file %s",
 927           attribute_length, CHECK);
 928       }
 929       is_synthetic = true;
 930     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
 931       if (attribute_length != 0) {
 932         classfile_parse_error(
 933           "Invalid Deprecated field attribute length %u in class file %s",
 934           attribute_length, CHECK);
 935       }
 936     } else if (_major_version >= JAVA_1_5_VERSION) {
 937       if (attribute_name == vmSymbols::tag_signature()) {
 938         if (attribute_length != 2) {
 939           classfile_parse_error(
 940             "Wrong size %u for field's Signature attribute in class file %s",
 941             attribute_length, CHECK);
 942         }
 943         generic_signature_index = parse_generic_signature_attribute(CHECK);
 944       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
 945         if (runtime_visible_annotations != NULL) {
 946           classfile_parse_error(
 947             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
 948         }
 949         runtime_visible_annotations_length = attribute_length;
 950         runtime_visible_annotations = cfs->get_u1_buffer();
 951         assert(runtime_visible_annotations != NULL, "null visible annotations");
 952         parse_annotations(runtime_visible_annotations,
 953                           runtime_visible_annotations_length,
 954                           parsed_annotations);
 955         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
 956       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
 957         if (runtime_invisible_annotations_exists) {
 958           classfile_parse_error(
 959             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
 960         }
 961         runtime_invisible_annotations_exists = true;
 962         if (PreserveAllAnnotations) {
 963           runtime_invisible_annotations_length = attribute_length;
 964           runtime_invisible_annotations = cfs->get_u1_buffer();
 965           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
 966         }
 967         cfs->skip_u1(attribute_length, CHECK);
 968       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
 969         if (runtime_visible_type_annotations != NULL) {
 970           classfile_parse_error(
 971             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
 972         }
 973         runtime_visible_type_annotations_length = attribute_length;
 974         runtime_visible_type_annotations = cfs->get_u1_buffer();
 975         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
 976         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
 977       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
 978         if (runtime_invisible_type_annotations_exists) {
 979           classfile_parse_error(
 980             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
 981         } else {
 982           runtime_invisible_type_annotations_exists = true;
 983         }
 984         if (PreserveAllAnnotations) {
 985           runtime_invisible_type_annotations_length = attribute_length;
 986           runtime_invisible_type_annotations = cfs->get_u1_buffer();
 987           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
 988         }
 989         cfs->skip_u1(attribute_length, CHECK);
 990       } else {
 991         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 992       }
 993     } else {
 994       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
 995     }
 996   }
 997 
 998   *constantvalue_index_addr = constantvalue_index;
 999   *is_synthetic_addr = is_synthetic;
1000   *generic_signature_index_addr = generic_signature_index;
1001   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1002                                             runtime_visible_annotations_length,
1003                                             runtime_invisible_annotations,
1004                                             runtime_invisible_annotations_length,
1005                                             CHECK);
1006   parsed_annotations->set_field_annotations(a);
1007   a = assemble_annotations(runtime_visible_type_annotations,
1008                            runtime_visible_type_annotations_length,
1009                            runtime_invisible_type_annotations,
1010                            runtime_invisible_type_annotations_length,
1011                            CHECK);
1012   parsed_annotations->set_field_type_annotations(a);
1013   return;
1014 }
1015 
1016 
1017 // Field allocation types. Used for computing field offsets.
1018 
1019 enum FieldAllocationType {
1020   STATIC_OOP,           // Oops
1021   STATIC_BYTE,          // Boolean, Byte, char
1022   STATIC_SHORT,         // shorts
1023   STATIC_WORD,          // ints
1024   STATIC_DOUBLE,        // aligned long or double
1025   NONSTATIC_OOP,
1026   NONSTATIC_BYTE,
1027   NONSTATIC_SHORT,
1028   NONSTATIC_WORD,
1029   NONSTATIC_DOUBLE,
1030   MAX_FIELD_ALLOCATION_TYPE,
1031   BAD_ALLOCATION_TYPE = -1
1032 };
1033 
1034 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1035   BAD_ALLOCATION_TYPE, // 0
1036   BAD_ALLOCATION_TYPE, // 1
1037   BAD_ALLOCATION_TYPE, // 2
1038   BAD_ALLOCATION_TYPE, // 3
1039   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1040   NONSTATIC_SHORT,     // T_CHAR        =  5,
1041   NONSTATIC_WORD,      // T_FLOAT       =  6,
1042   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1043   NONSTATIC_BYTE,      // T_BYTE        =  8,
1044   NONSTATIC_SHORT,     // T_SHORT       =  9,
1045   NONSTATIC_WORD,      // T_INT         = 10,
1046   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1047   NONSTATIC_OOP,       // T_OBJECT      = 12,
1048   NONSTATIC_OOP,       // T_ARRAY       = 13,
1049   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1050   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1051   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1052   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1053   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1054   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1055   BAD_ALLOCATION_TYPE, // 0
1056   BAD_ALLOCATION_TYPE, // 1
1057   BAD_ALLOCATION_TYPE, // 2
1058   BAD_ALLOCATION_TYPE, // 3
1059   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1060   STATIC_SHORT,        // T_CHAR        =  5,
1061   STATIC_WORD,         // T_FLOAT       =  6,
1062   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1063   STATIC_BYTE,         // T_BYTE        =  8,
1064   STATIC_SHORT,        // T_SHORT       =  9,
1065   STATIC_WORD,         // T_INT         = 10,
1066   STATIC_DOUBLE,       // T_LONG        = 11,
1067   STATIC_OOP,          // T_OBJECT      = 12,
1068   STATIC_OOP,          // T_ARRAY       = 13,
1069   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1070   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1071   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1072   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1073   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1074   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1075 };
1076 
1077 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1078   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1079   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1080   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1081   return result;
1082 }
1083 
1084 class FieldAllocationCount: public ResourceObj {
1085  public:
1086   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1087 
1088   FieldAllocationCount() {
1089     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1090       count[i] = 0;
1091     }
1092   }
1093 
1094   FieldAllocationType update(bool is_static, BasicType type) {
1095     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1096     // Make sure there is no overflow with injected fields.
1097     assert(count[atype] < 0xFFFF, "More than 65535 fields");
1098     count[atype]++;
1099     return atype;
1100   }
1101 };
1102 
1103 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name,
1104                                          bool is_interface,
1105                                          FieldAllocationCount *fac,
1106                                          u2* java_fields_count_ptr, TRAPS) {
1107   ClassFileStream* cfs = stream();
1108   cfs->guarantee_more(2, CHECK_NULL);  // length
1109   u2 length = cfs->get_u2_fast();
1110   *java_fields_count_ptr = length;
1111 
1112   int num_injected = 0;
1113   InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected);
1114   int total_fields = length + num_injected;
1115 
1116   // The field array starts with tuples of shorts
1117   // [access, name index, sig index, initial value index, byte offset].
1118   // A generic signature slot only exists for field with generic
1119   // signature attribute. And the access flag is set with
1120   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1121   // signature slots are at the end of the field array and after all
1122   // other fields data.
1123   //
1124   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1125   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1126   //       ...
1127   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1128   //       [generic signature index]
1129   //       [generic signature index]
1130   //       ...
1131   //
1132   // Allocate a temporary resource array for field data. For each field,
1133   // a slot is reserved in the temporary array for the generic signature
1134   // index. After parsing all fields, the data are copied to a permanent
1135   // array and any unused slots will be discarded.
1136   ResourceMark rm(THREAD);
1137   u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD(
1138              THREAD, u2, total_fields * (FieldInfo::field_slots + 1));
1139 
1140   // The generic signature slots start after all other fields' data.
1141   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1142   int num_generic_signature = 0;
1143   for (int n = 0; n < length; n++) {
1144     cfs->guarantee_more(8, CHECK_NULL);  // access_flags, name_index, descriptor_index, attributes_count
1145 
1146     AccessFlags access_flags;
1147     jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1148     verify_legal_field_modifiers(flags, is_interface, CHECK_NULL);
1149     access_flags.set_flags(flags);
1150 
1151     u2 name_index = cfs->get_u2_fast();
1152     int cp_size = _cp->length();
1153     check_property(valid_symbol_at(name_index),
1154       "Invalid constant pool index %u for field name in class file %s",
1155       name_index,
1156       CHECK_NULL);
1157     Symbol*  name = _cp->symbol_at(name_index);
1158     verify_legal_field_name(name, CHECK_NULL);
1159 
1160     u2 signature_index = cfs->get_u2_fast();
1161     check_property(valid_symbol_at(signature_index),
1162       "Invalid constant pool index %u for field signature in class file %s",
1163       signature_index, CHECK_NULL);
1164     Symbol*  sig = _cp->symbol_at(signature_index);
1165     verify_legal_field_signature(name, sig, CHECK_NULL);
1166 
1167     u2 constantvalue_index = 0;
1168     bool is_synthetic = false;
1169     u2 generic_signature_index = 0;
1170     bool is_static = access_flags.is_static();
1171     FieldAnnotationCollector parsed_annotations(_loader_data);
1172 
1173     u2 attributes_count = cfs->get_u2_fast();
1174     if (attributes_count > 0) {
1175       parse_field_attributes(attributes_count, is_static, signature_index,
1176                              &constantvalue_index, &is_synthetic,
1177                              &generic_signature_index, &parsed_annotations,
1178                              CHECK_NULL);
1179       if (parsed_annotations.field_annotations() != NULL) {
1180         if (_fields_annotations == NULL) {
1181           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1182                                              _loader_data, length, NULL,
1183                                              CHECK_NULL);
1184         }
1185         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1186         parsed_annotations.set_field_annotations(NULL);
1187       }
1188       if (parsed_annotations.field_type_annotations() != NULL) {
1189         if (_fields_type_annotations == NULL) {
1190           _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>(
1191                                                   _loader_data, length, NULL,
1192                                                   CHECK_NULL);
1193         }
1194         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1195         parsed_annotations.set_field_type_annotations(NULL);
1196       }
1197 
1198       if (is_synthetic) {
1199         access_flags.set_is_synthetic();
1200       }
1201       if (generic_signature_index != 0) {
1202         access_flags.set_field_has_generic_signature();
1203         fa[generic_signature_slot] = generic_signature_index;
1204         generic_signature_slot ++;
1205         num_generic_signature ++;
1206       }
1207     }
1208 
1209     FieldInfo* field = FieldInfo::from_field_array(fa, n);
1210     field->initialize(access_flags.as_short(),
1211                       name_index,
1212                       signature_index,
1213                       constantvalue_index);
1214     BasicType type = _cp->basic_type_for_signature_at(signature_index);
1215 
1216     // Remember how many oops we encountered and compute allocation type
1217     FieldAllocationType atype = fac->update(is_static, type);
1218     field->set_allocation_type(atype);
1219 
1220     // After field is initialized with type, we can augment it with aux info
1221     if (parsed_annotations.has_any_annotations())
1222       parsed_annotations.apply_to(field);
1223   }
1224 
1225   int index = length;
1226   if (num_injected != 0) {
1227     for (int n = 0; n < num_injected; n++) {
1228       // Check for duplicates
1229       if (injected[n].may_be_java) {
1230         Symbol* name      = injected[n].name();
1231         Symbol* signature = injected[n].signature();
1232         bool duplicate = false;
1233         for (int i = 0; i < length; i++) {
1234           FieldInfo* f = FieldInfo::from_field_array(fa, i);
1235           if (name      == _cp->symbol_at(f->name_index()) &&
1236               signature == _cp->symbol_at(f->signature_index())) {
1237             // Symbol is desclared in Java so skip this one
1238             duplicate = true;
1239             break;
1240           }
1241         }
1242         if (duplicate) {
1243           // These will be removed from the field array at the end
1244           continue;
1245         }
1246       }
1247 
1248       // Injected field
1249       FieldInfo* field = FieldInfo::from_field_array(fa, index);
1250       field->initialize(JVM_ACC_FIELD_INTERNAL,
1251                         injected[n].name_index,
1252                         injected[n].signature_index,
1253                         0);
1254 
1255       BasicType type = FieldType::basic_type(injected[n].signature());
1256 
1257       // Remember how many oops we encountered and compute allocation type
1258       FieldAllocationType atype = fac->update(false, type);
1259       field->set_allocation_type(atype);
1260       index++;
1261     }
1262   }
1263 
1264   // Now copy the fields' data from the temporary resource array.
1265   // Sometimes injected fields already exist in the Java source so
1266   // the fields array could be too long.  In that case the
1267   // fields array is trimed. Also unused slots that were reserved
1268   // for generic signature indexes are discarded.
1269   Array<u2>* fields = MetadataFactory::new_array<u2>(
1270           _loader_data, index * FieldInfo::field_slots + num_generic_signature,
1271           CHECK_NULL);
1272   _fields = fields; // save in case of error
1273   {
1274     int i = 0;
1275     for (; i < index * FieldInfo::field_slots; i++) {
1276       fields->at_put(i, fa[i]);
1277     }
1278     for (int j = total_fields * FieldInfo::field_slots;
1279          j < generic_signature_slot; j++) {
1280       fields->at_put(i++, fa[j]);
1281     }
1282     assert(i == fields->length(), "");
1283   }
1284 
1285   if (_need_verify && length > 1) {
1286     // Check duplicated fields
1287     ResourceMark rm(THREAD);
1288     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1289       THREAD, NameSigHash*, HASH_ROW_SIZE);
1290     initialize_hashtable(names_and_sigs);
1291     bool dup = false;
1292     {
1293       debug_only(No_Safepoint_Verifier nsv;)
1294       for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) {
1295         Symbol* name = fs.name();
1296         Symbol* sig = fs.signature();
1297         // If no duplicates, add name/signature in hashtable names_and_sigs.
1298         if (!put_after_lookup(name, sig, names_and_sigs)) {
1299           dup = true;
1300           break;
1301         }
1302       }
1303     }
1304     if (dup) {
1305       classfile_parse_error("Duplicate field name&signature in class file %s",
1306                             CHECK_NULL);
1307     }
1308   }
1309 
1310   return fields;
1311 }
1312 
1313 
1314 static void copy_u2_with_conversion(u2* dest, u2* src, int length) {
1315   while (length-- > 0) {
1316     *dest++ = Bytes::get_Java_u2((u1*) (src++));
1317   }
1318 }
1319 
1320 
1321 u2* ClassFileParser::parse_exception_table(u4 code_length,
1322                                            u4 exception_table_length,
1323                                            TRAPS) {
1324   ClassFileStream* cfs = stream();
1325 
1326   u2* exception_table_start = cfs->get_u2_buffer();
1327   assert(exception_table_start != NULL, "null exception table");
1328   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index
1329   // Will check legal target after parsing code array in verifier.
1330   if (_need_verify) {
1331     for (unsigned int i = 0; i < exception_table_length; i++) {
1332       u2 start_pc = cfs->get_u2_fast();
1333       u2 end_pc = cfs->get_u2_fast();
1334       u2 handler_pc = cfs->get_u2_fast();
1335       u2 catch_type_index = cfs->get_u2_fast();
1336       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1337                          "Illegal exception table range in class file %s",
1338                          CHECK_NULL);
1339       guarantee_property(handler_pc < code_length,
1340                          "Illegal exception table handler in class file %s",
1341                          CHECK_NULL);
1342       if (catch_type_index != 0) {
1343         guarantee_property(valid_klass_reference_at(catch_type_index),
1344                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1345       }
1346     }
1347   } else {
1348     cfs->skip_u2_fast(exception_table_length * 4);
1349   }
1350   return exception_table_start;
1351 }
1352 
1353 void ClassFileParser::parse_linenumber_table(
1354     u4 code_attribute_length, u4 code_length,
1355     CompressedLineNumberWriteStream** write_stream, TRAPS) {
1356   ClassFileStream* cfs = stream();
1357   unsigned int num_entries = cfs->get_u2(CHECK);
1358 
1359   // Each entry is a u2 start_pc, and a u2 line_number
1360   unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2));
1361 
1362   // Verify line number attribute and table length
1363   check_property(
1364     code_attribute_length == sizeof(u2) + length_in_bytes,
1365     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1366 
1367   cfs->guarantee_more(length_in_bytes, CHECK);
1368 
1369   if ((*write_stream) == NULL) {
1370     if (length_in_bytes > fixed_buffer_size) {
1371       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1372     } else {
1373       (*write_stream) = new CompressedLineNumberWriteStream(
1374         linenumbertable_buffer, fixed_buffer_size);
1375     }
1376   }
1377 
1378   while (num_entries-- > 0) {
1379     u2 bci  = cfs->get_u2_fast(); // start_pc
1380     u2 line = cfs->get_u2_fast(); // line_number
1381     guarantee_property(bci < code_length,
1382         "Invalid pc in LineNumberTable in class file %s", CHECK);
1383     (*write_stream)->write_pair(bci, line);
1384   }
1385 }
1386 
1387 
1388 class LVT_Hash : public AllStatic {
1389  public:
1390 
1391   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1392   /*
1393    * 3-tuple start_bci/length/slot has to be unique key,
1394    * so the following comparison seems to be redundant:
1395    *       && elem->name_cp_index == entry->_elem->name_cp_index
1396    */
1397     return (e0.start_bci     == e1.start_bci &&
1398             e0.length        == e1.length &&
1399             e0.name_cp_index == e1.name_cp_index &&
1400             e0.slot          == e1.slot);
1401   }
1402 
1403   static unsigned int hash(LocalVariableTableElement const& e0) {
1404     unsigned int raw_hash = e0.start_bci;
1405 
1406     raw_hash = e0.length        + raw_hash * 37;
1407     raw_hash = e0.name_cp_index + raw_hash * 37;
1408     raw_hash = e0.slot          + raw_hash * 37;
1409 
1410     return raw_hash;
1411   }
1412 };
1413 
1414 
1415 // Class file LocalVariableTable elements.
1416 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1417  public:
1418   u2 start_bci;
1419   u2 length;
1420   u2 name_cp_index;
1421   u2 descriptor_cp_index;
1422   u2 slot;
1423 };
1424 
1425 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) {
1426   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1427   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1428   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1429   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1430   lvt->signature_cp_index  = 0;
1431   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1432 }
1433 
1434 // Function is used to parse both attributes:
1435 //       LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1436 u2* ClassFileParser::parse_localvariable_table(u4 code_length,
1437                                                u2 max_locals,
1438                                                u4 code_attribute_length,
1439                                                u2* localvariable_table_length,
1440                                                bool isLVTT,
1441                                                TRAPS) {
1442   ClassFileStream* cfs = stream();
1443   const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1444   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1445   unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1446   // Verify local variable table attribute has right length
1447   if (_need_verify) {
1448     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1449                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1450   }
1451   u2* localvariable_table_start = cfs->get_u2_buffer();
1452   assert(localvariable_table_start != NULL, "null local variable table");
1453   if (!_need_verify) {
1454     cfs->skip_u2_fast(size);
1455   } else {
1456     cfs->guarantee_more(size * 2, CHECK_NULL);
1457     for(int i = 0; i < (*localvariable_table_length); i++) {
1458       u2 start_pc = cfs->get_u2_fast();
1459       u2 length = cfs->get_u2_fast();
1460       u2 name_index = cfs->get_u2_fast();
1461       u2 descriptor_index = cfs->get_u2_fast();
1462       u2 index = cfs->get_u2_fast();
1463       // Assign to a u4 to avoid overflow
1464       u4 end_pc = (u4)start_pc + (u4)length;
1465 
1466       if (start_pc >= code_length) {
1467         classfile_parse_error(
1468           "Invalid start_pc %u in %s in class file %s",
1469           start_pc, tbl_name, CHECK_NULL);
1470       }
1471       if (end_pc > code_length) {
1472         classfile_parse_error(
1473           "Invalid length %u in %s in class file %s",
1474           length, tbl_name, CHECK_NULL);
1475       }
1476       int cp_size = _cp->length();
1477       guarantee_property(valid_symbol_at(name_index),
1478         "Name index %u in %s has bad constant type in class file %s",
1479         name_index, tbl_name, CHECK_NULL);
1480       guarantee_property(valid_symbol_at(descriptor_index),
1481         "Signature index %u in %s has bad constant type in class file %s",
1482         descriptor_index, tbl_name, CHECK_NULL);
1483 
1484       Symbol*  name = _cp->symbol_at(name_index);
1485       Symbol*  sig = _cp->symbol_at(descriptor_index);
1486       verify_legal_field_name(name, CHECK_NULL);
1487       u2 extra_slot = 0;
1488       if (!isLVTT) {
1489         verify_legal_field_signature(name, sig, CHECK_NULL);
1490 
1491         // 4894874: check special cases for double and long local variables
1492         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1493             sig == vmSymbols::type_signature(T_LONG)) {
1494           extra_slot = 1;
1495         }
1496       }
1497       guarantee_property((index + extra_slot) < max_locals,
1498                           "Invalid index %u in %s in class file %s",
1499                           index, tbl_name, CHECK_NULL);
1500     }
1501   }
1502   return localvariable_table_start;
1503 }
1504 
1505 
1506 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index,
1507                                       u1* u1_array, u2* u2_array, TRAPS) {
1508   ClassFileStream* cfs = stream();
1509   u2 index = 0; // index in the array with long/double occupying two slots
1510   u4 i1 = *u1_index;
1511   u4 i2 = *u2_index + 1;
1512   for(int i = 0; i < array_length; i++) {
1513     u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1514     index++;
1515     if (tag == ITEM_Long || tag == ITEM_Double) {
1516       index++;
1517     } else if (tag == ITEM_Object) {
1518       u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1519       guarantee_property(valid_klass_reference_at(class_index),
1520                          "Bad class index %u in StackMap in class file %s",
1521                          class_index, CHECK);
1522     } else if (tag == ITEM_Uninitialized) {
1523       u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1524       guarantee_property(
1525         offset < code_length,
1526         "Bad uninitialized type offset %u in StackMap in class file %s",
1527         offset, CHECK);
1528     } else {
1529       guarantee_property(
1530         tag <= (u1)ITEM_Uninitialized,
1531         "Unknown variable type %u in StackMap in class file %s",
1532         tag, CHECK);
1533     }
1534   }
1535   u2_array[*u2_index] = index;
1536   *u1_index = i1;
1537   *u2_index = i2;
1538 }
1539 
1540 u1* ClassFileParser::parse_stackmap_table(
1541     u4 code_attribute_length, TRAPS) {
1542   if (code_attribute_length == 0)
1543     return NULL;
1544 
1545   ClassFileStream* cfs = stream();
1546   u1* stackmap_table_start = cfs->get_u1_buffer();
1547   assert(stackmap_table_start != NULL, "null stackmap table");
1548 
1549   // check code_attribute_length first
1550   stream()->skip_u1(code_attribute_length, CHECK_NULL);
1551 
1552   if (!_need_verify && !DumpSharedSpaces) {
1553     return NULL;
1554   }
1555   return stackmap_table_start;
1556 }
1557 
1558 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length,
1559                                               u4 method_attribute_length,
1560                                               TRAPS) {
1561   ClassFileStream* cfs = stream();
1562   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1563   *checked_exceptions_length = cfs->get_u2_fast();
1564   unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1565   u2* checked_exceptions_start = cfs->get_u2_buffer();
1566   assert(checked_exceptions_start != NULL, "null checked exceptions");
1567   if (!_need_verify) {
1568     cfs->skip_u2_fast(size);
1569   } else {
1570     // Verify each value in the checked exception table
1571     u2 checked_exception;
1572     u2 len = *checked_exceptions_length;
1573     cfs->guarantee_more(2 * len, CHECK_NULL);
1574     for (int i = 0; i < len; i++) {
1575       checked_exception = cfs->get_u2_fast();
1576       check_property(
1577         valid_klass_reference_at(checked_exception),
1578         "Exception name has bad type at constant pool %u in class file %s",
1579         checked_exception, CHECK_NULL);
1580     }
1581   }
1582   // check exceptions attribute length
1583   if (_need_verify) {
1584     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1585                                                    sizeof(u2) * size),
1586                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1587   }
1588   return checked_exceptions_start;
1589 }
1590 
1591 void ClassFileParser::throwIllegalSignature(
1592     const char* type, Symbol* name, Symbol* sig, TRAPS) {
1593   ResourceMark rm(THREAD);
1594   Exceptions::fthrow(THREAD_AND_LOCATION,
1595       vmSymbols::java_lang_ClassFormatError(),
1596       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1597       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1598 }
1599 
1600 // Skip an annotation.  Return >=limit if there is any problem.
1601 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) {
1602   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1603   // value := switch (tag:u1) { ... }
1604   index += 2;  // skip atype
1605   if ((index += 2) >= limit)  return limit;  // read nmem
1606   int nmem = Bytes::get_Java_u2(buffer+index-2);
1607   while (--nmem >= 0 && index < limit) {
1608     index += 2; // skip member
1609     index = skip_annotation_value(buffer, limit, index);
1610   }
1611   return index;
1612 }
1613 
1614 // Skip an annotation value.  Return >=limit if there is any problem.
1615 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) {
1616   // value := switch (tag:u1) {
1617   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1618   //   case e: e_class:u2 e_name:u2;
1619   //   case s: s_con:u2;
1620   //   case [: do(nval:u2) {value};
1621   //   case @: annotation;
1622   //   case s: s_con:u2;
1623   // }
1624   if ((index += 1) >= limit)  return limit;  // read tag
1625   u1 tag = buffer[index-1];
1626   switch (tag) {
1627   case 'B': case 'C': case 'I': case 'S': case 'Z':
1628   case 'D': case 'F': case 'J': case 'c': case 's':
1629     index += 2;  // skip con or s_con
1630     break;
1631   case 'e':
1632     index += 4;  // skip e_class, e_name
1633     break;
1634   case '[':
1635     {
1636       if ((index += 2) >= limit)  return limit;  // read nval
1637       int nval = Bytes::get_Java_u2(buffer+index-2);
1638       while (--nval >= 0 && index < limit) {
1639         index = skip_annotation_value(buffer, limit, index);
1640       }
1641     }
1642     break;
1643   case '@':
1644     index = skip_annotation(buffer, limit, index);
1645     break;
1646   default:
1647     return limit;  //  bad tag byte
1648   }
1649   return index;
1650 }
1651 
1652 // Sift through annotations, looking for those significant to the VM:
1653 void ClassFileParser::parse_annotations(u1* buffer, int limit,
1654                                         ClassFileParser::AnnotationCollector* coll) {
1655   // annotations := do(nann:u2) {annotation}
1656   int index = 0;
1657   if ((index += 2) >= limit)  return;  // read nann
1658   int nann = Bytes::get_Java_u2(buffer+index-2);
1659   enum {  // initial annotation layout
1660     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1661     count_off = 2,      // u2   such as 1 (one value)
1662     member_off = 4,     // utf8 such as 'value'
1663     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1664     e_tag_val = 'e',
1665       e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1666       e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1667       e_size = 11,     // end of 'e' annotation
1668     c_tag_val = 'c',    // payload is type
1669       c_con_off = 7,    // utf8 payload, such as 'I'
1670       c_size = 9,       // end of 'c' annotation
1671     s_tag_val = 's',    // payload is String
1672       s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1673       s_size = 9,
1674     min_size = 6        // smallest possible size (zero members)
1675   };
1676   while ((--nann) >= 0 && (index-2 + min_size <= limit)) {
1677     int index0 = index;
1678     index = skip_annotation(buffer, limit, index);
1679     u1* abase = buffer + index0;
1680     int atype = Bytes::get_Java_u2(abase + atype_off);
1681     int count = Bytes::get_Java_u2(abase + count_off);
1682     Symbol* aname = check_symbol_at(_cp, atype);
1683     if (aname == NULL)  break;  // invalid annotation name
1684     Symbol* member = NULL;
1685     if (count >= 1) {
1686       int member_index = Bytes::get_Java_u2(abase + member_off);
1687       member = check_symbol_at(_cp, member_index);
1688       if (member == NULL)  break;  // invalid member name
1689     }
1690 
1691     // Here is where parsing particular annotations will take place.
1692     AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname);
1693     if (id == AnnotationCollector::_unknown)  continue;
1694     coll->set_annotation(id);
1695 
1696     if (id == AnnotationCollector::_sun_misc_Contended) {
1697       // @Contended can optionally specify the contention group.
1698       //
1699       // Contended group defines the equivalence class over the fields:
1700       // the fields within the same contended group are not treated distinct.
1701       // The only exception is default group, which does not incur the
1702       // equivalence. Naturally, contention group for classes is meaningless.
1703       //
1704       // While the contention group is specified as String, annotation
1705       // values are already interned, and we might as well use the constant
1706       // pool index as the group tag.
1707       //
1708       u2 group_index = 0; // default contended group
1709       if (count == 1
1710           && s_size == (index - index0)  // match size
1711           && s_tag_val == *(abase + tag_off)
1712           && member == vmSymbols::value_name()) {
1713         group_index = Bytes::get_Java_u2(abase + s_con_off);
1714         if (_cp->symbol_at(group_index)->utf8_length() == 0) {
1715           group_index = 0; // default contended group
1716         }
1717       }
1718       coll->set_contended_group(group_index);
1719     }















1720   }
1721 }
1722 
1723 ClassFileParser::AnnotationCollector::ID
1724 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data,
1725                                                                 Symbol* name) {
1726   vmSymbols::SID sid = vmSymbols::find_sid(name);
1727   // Privileged code can use all annotations.  Other code silently drops some.
1728   const bool privileged = loader_data->is_the_null_class_loader_data() ||
1729                           loader_data->is_ext_class_loader_data() ||
1730                           loader_data->is_anonymous();
1731   switch (sid) {
1732   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature):
1733     if (_location != _in_method)  break;  // only allow for methods
1734     if (!privileged)              break;  // only allow in privileged code
1735     return _method_CallerSensitive;
1736   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature):
1737     if (_location != _in_method)  break;  // only allow for methods
1738     if (!privileged)              break;  // only allow in privileged code
1739     return _method_ForceInline;
1740   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature):
1741     if (_location != _in_method)  break;  // only allow for methods
1742     if (!privileged)              break;  // only allow in privileged code
1743     return _method_DontInline;
1744   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature):
1745     if (_location != _in_method)  break;  // only allow for methods
1746     if (!privileged)              break;  // only allow in privileged code
1747     return _method_InjectedProfile;
1748   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature):
1749     if (_location != _in_method)  break;  // only allow for methods
1750     if (!privileged)              break;  // only allow in privileged code
1751     return _method_LambdaForm_Compiled;
1752   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature):
1753     if (_location != _in_method)  break;  // only allow for methods
1754     if (!privileged)              break;  // only allow in privileged code
1755     return _method_LambdaForm_Hidden;
1756   case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature):
1757     if (_location != _in_method)  break;  // only allow for methods
1758     if (!privileged)              break;  // only allow in privileged code
1759     return _method_HotSpotIntrinsicCandidate;



1760 #if INCLUDE_JVMCI
1761   case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_Stable_signature):
1762     if (_location != _in_field)   break;  // only allow for fields
1763     if (!privileged)              break;  // only allow in privileged code
1764     return _field_Stable;
1765 #endif
1766   case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature):
1767     if (_location != _in_field)   break;  // only allow for fields
1768     if (!privileged)              break;  // only allow in privileged code
1769     return _field_Stable;
1770   case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature):
1771     if (_location != _in_field && _location != _in_class)          break;  // only allow for fields and classes
1772     if (!EnableContended || (RestrictContended && !privileged))    break;  // honor privileges
1773     return _sun_misc_Contended;
1774   default: break;
1775   }
1776   return AnnotationCollector::_unknown;
1777 }
1778 
1779 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1780   if (is_contended())
1781     f->set_contended_group(contended_group());
1782   if (is_stable())
1783     f->set_stable(true);
1784 }
1785 
1786 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1787   // If there's an error deallocate metadata for field annotations
1788   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1789   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1790 }
1791 
1792 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) {
1793   if (has_annotation(_method_CallerSensitive))
1794     m->set_caller_sensitive(true);
1795   if (has_annotation(_method_ForceInline))
1796     m->set_force_inline(true);
1797   if (has_annotation(_method_DontInline))
1798     m->set_dont_inline(true);
1799   if (has_annotation(_method_InjectedProfile))
1800     m->set_has_injected_profile(true);
1801   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1802     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1803   if (has_annotation(_method_LambdaForm_Hidden))
1804     m->set_hidden(true);
1805   if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
1806     m->set_intrinsic_candidate(true);



1807 }
1808 
1809 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) {
1810   k->set_is_contended(is_contended());
1811 }
1812 
1813 
1814 #define MAX_ARGS_SIZE 255
1815 #define MAX_CODE_SIZE 65535
1816 #define INITIAL_MAX_LVT_NUMBER 256
1817 
1818 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
1819  *
1820  * Rules for LVT's and LVTT's are:
1821  *   - There can be any number of LVT's and LVTT's.
1822  *   - If there are n LVT's, it is the same as if there was just
1823  *     one LVT containing all the entries from the n LVT's.
1824  *   - There may be no more than one LVT entry per local variable.
1825  *     Two LVT entries are 'equal' if these fields are the same:
1826  *        start_pc, length, name, slot
1827  *   - There may be no more than one LVTT entry per each LVT entry.
1828  *     Each LVTT entry has to match some LVT entry.
1829  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
1830  */
1831 void ClassFileParser::copy_localvariable_table(ConstMethod* cm,
1832                                                int lvt_cnt,
1833                                                u2* localvariable_table_length,
1834                                                u2** localvariable_table_start,
1835                                                int lvtt_cnt,
1836                                                u2* localvariable_type_table_length,
1837                                                u2** localvariable_type_table_start,
1838                                                TRAPS) {
1839 
1840   ResourceMark rm(THREAD);
1841 
1842   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
1843                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
1844 
1845   LVT_HashTable* table = new LVT_HashTable();
1846 
1847   // To fill LocalVariableTable in
1848   Classfile_LVT_Element*  cf_lvt;
1849   LocalVariableTableElement* lvt = cm->localvariable_table_start();
1850 
1851   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
1852     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
1853     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
1854       copy_lvt_element(&cf_lvt[idx], lvt);
1855       // If no duplicates, add LVT elem in hashtable.
1856       if (table->put(*lvt, lvt) == false
1857           && _need_verify
1858           && _major_version >= JAVA_1_5_VERSION) {
1859         classfile_parse_error("Duplicated LocalVariableTable attribute "
1860                               "entry for '%s' in class file %s",
1861                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
1862                                CHECK);
1863       }
1864     }
1865   }
1866 
1867   // To merge LocalVariableTable and LocalVariableTypeTable
1868   Classfile_LVT_Element* cf_lvtt;
1869   LocalVariableTableElement lvtt_elem;
1870 
1871   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
1872     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
1873     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
1874       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
1875       LocalVariableTableElement** entry = table->get(lvtt_elem);
1876       if (entry == NULL) {
1877         if (_need_verify) {
1878           classfile_parse_error("LVTT entry for '%s' in class file %s "
1879                                 "does not match any LVT entry",
1880                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1881                                  CHECK);
1882         }
1883       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
1884         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
1885                               "entry for '%s' in class file %s",
1886                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
1887                                CHECK);
1888       } else {
1889         // to add generic signatures into LocalVariableTable
1890         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
1891       }
1892     }
1893   }
1894 }
1895 
1896 
1897 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
1898                                        u1* runtime_visible_annotations,
1899                                        int runtime_visible_annotations_length,
1900                                        u1* runtime_invisible_annotations,
1901                                        int runtime_invisible_annotations_length,
1902                                        u1* runtime_visible_parameter_annotations,
1903                                        int runtime_visible_parameter_annotations_length,
1904                                        u1* runtime_invisible_parameter_annotations,
1905                                        int runtime_invisible_parameter_annotations_length,
1906                                        u1* runtime_visible_type_annotations,
1907                                        int runtime_visible_type_annotations_length,
1908                                        u1* runtime_invisible_type_annotations,
1909                                        int runtime_invisible_type_annotations_length,
1910                                        u1* annotation_default,
1911                                        int annotation_default_length,
1912                                        TRAPS) {
1913 
1914   AnnotationArray* a;
1915 
1916   if (runtime_visible_annotations_length +
1917       runtime_invisible_annotations_length > 0) {
1918      a = assemble_annotations(runtime_visible_annotations,
1919                               runtime_visible_annotations_length,
1920                               runtime_invisible_annotations,
1921                               runtime_invisible_annotations_length,
1922                               CHECK);
1923      cm->set_method_annotations(a);
1924   }
1925 
1926   if (runtime_visible_parameter_annotations_length +
1927       runtime_invisible_parameter_annotations_length > 0) {
1928     a = assemble_annotations(runtime_visible_parameter_annotations,
1929                              runtime_visible_parameter_annotations_length,
1930                              runtime_invisible_parameter_annotations,
1931                              runtime_invisible_parameter_annotations_length,
1932                              CHECK);
1933     cm->set_parameter_annotations(a);
1934   }
1935 
1936   if (annotation_default_length > 0) {
1937     a = assemble_annotations(annotation_default,
1938                              annotation_default_length,
1939                              NULL,
1940                              0,
1941                              CHECK);
1942     cm->set_default_annotations(a);
1943   }
1944 
1945   if (runtime_visible_type_annotations_length +
1946       runtime_invisible_type_annotations_length > 0) {
1947     a = assemble_annotations(runtime_visible_type_annotations,
1948                              runtime_visible_type_annotations_length,
1949                              runtime_invisible_type_annotations,
1950                              runtime_invisible_type_annotations_length,
1951                              CHECK);
1952     cm->set_type_annotations(a);
1953   }
1954 }
1955 
1956 
1957 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
1958 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
1959 // Method* to save footprint, so we only know the size of the resulting Method* when the
1960 // entire method attribute is parsed.
1961 //
1962 // The promoted_flags parameter is used to pass relevant access_flags
1963 // from the method back up to the containing klass. These flag values
1964 // are added to klass's access_flags.
1965 
1966 methodHandle ClassFileParser::parse_method(bool is_interface,
1967                                            AccessFlags *promoted_flags,
1968                                            TRAPS) {
1969   ClassFileStream* cfs = stream();
1970   methodHandle nullHandle;
1971   ResourceMark rm(THREAD);
1972   // Parse fixed parts
1973   cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count
1974 
1975   int flags = cfs->get_u2_fast();
1976   u2 name_index = cfs->get_u2_fast();
1977   int cp_size = _cp->length();
1978   check_property(
1979     valid_symbol_at(name_index),
1980     "Illegal constant pool index %u for method name in class file %s",
1981     name_index, CHECK_(nullHandle));
1982   Symbol*  name = _cp->symbol_at(name_index);
1983   verify_legal_method_name(name, CHECK_(nullHandle));
1984 
1985   u2 signature_index = cfs->get_u2_fast();
1986   guarantee_property(
1987     valid_symbol_at(signature_index),
1988     "Illegal constant pool index %u for method signature in class file %s",
1989     signature_index, CHECK_(nullHandle));
1990   Symbol*  signature = _cp->symbol_at(signature_index);
1991 
1992   AccessFlags access_flags;
1993   if (name == vmSymbols::class_initializer_name()) {
1994     // We ignore the other access flags for a valid class initializer.
1995     // (JVM Spec 2nd ed., chapter 4.6)
1996     if (_major_version < 51) { // backward compatibility
1997       flags = JVM_ACC_STATIC;
1998     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
1999       flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2000     } else {
2001       classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_(nullHandle));
2002     }
2003   } else {
2004     verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle));
2005   }
2006 
2007   if (name == vmSymbols::object_initializer_name() && is_interface) {
2008     classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_(nullHandle));
2009   }
2010 
2011   int args_size = -1;  // only used when _need_verify is true
2012   if (_need_verify) {
2013     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2014                  verify_legal_method_signature(name, signature, CHECK_(nullHandle));
2015     if (args_size > MAX_ARGS_SIZE) {
2016       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle));
2017     }
2018   }
2019 
2020   access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2021 
2022   // Default values for code and exceptions attribute elements
2023   u2 max_stack = 0;
2024   u2 max_locals = 0;
2025   u4 code_length = 0;
2026   u1* code_start = 0;
2027   u2 exception_table_length = 0;
2028   u2* exception_table_start = NULL;
2029   Array<int>* exception_handlers = Universe::the_empty_int_array();
2030   u2 checked_exceptions_length = 0;
2031   u2* checked_exceptions_start = NULL;
2032   CompressedLineNumberWriteStream* linenumber_table = NULL;
2033   int linenumber_table_length = 0;
2034   int total_lvt_length = 0;
2035   u2 lvt_cnt = 0;
2036   u2 lvtt_cnt = 0;
2037   bool lvt_allocated = false;
2038   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2039   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2040   u2* localvariable_table_length = NULL;
2041   u2** localvariable_table_start = NULL;
2042   u2* localvariable_type_table_length = NULL;
2043   u2** localvariable_type_table_start = NULL;
2044   int method_parameters_length = -1;
2045   u1* method_parameters_data = NULL;
2046   bool method_parameters_seen = false;
2047   bool parsed_code_attribute = false;
2048   bool parsed_checked_exceptions_attribute = false;
2049   bool parsed_stackmap_attribute = false;
2050   // stackmap attribute - JDK1.5
2051   u1* stackmap_data = NULL;
2052   int stackmap_data_length = 0;
2053   u2 generic_signature_index = 0;
2054   MethodAnnotationCollector parsed_annotations;
2055   u1* runtime_visible_annotations = NULL;
2056   int runtime_visible_annotations_length = 0;
2057   u1* runtime_invisible_annotations = NULL;
2058   int runtime_invisible_annotations_length = 0;
2059   u1* runtime_visible_parameter_annotations = NULL;
2060   int runtime_visible_parameter_annotations_length = 0;
2061   u1* runtime_invisible_parameter_annotations = NULL;
2062   int runtime_invisible_parameter_annotations_length = 0;
2063   u1* runtime_visible_type_annotations = NULL;
2064   int runtime_visible_type_annotations_length = 0;
2065   u1* runtime_invisible_type_annotations = NULL;
2066   int runtime_invisible_type_annotations_length = 0;
2067   bool runtime_invisible_annotations_exists = false;
2068   bool runtime_invisible_type_annotations_exists = false;
2069   bool runtime_invisible_parameter_annotations_exists = false;
2070   u1* annotation_default = NULL;
2071   int annotation_default_length = 0;
2072 
2073   // Parse code and exceptions attribute
2074   u2 method_attributes_count = cfs->get_u2_fast();
2075   while (method_attributes_count--) {
2076     cfs->guarantee_more(6, CHECK_(nullHandle));  // method_attribute_name_index, method_attribute_length
2077     u2 method_attribute_name_index = cfs->get_u2_fast();
2078     u4 method_attribute_length = cfs->get_u4_fast();
2079     check_property(
2080       valid_symbol_at(method_attribute_name_index),
2081       "Invalid method attribute name index %u in class file %s",
2082       method_attribute_name_index, CHECK_(nullHandle));
2083 
2084     Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index);
2085     if (method_attribute_name == vmSymbols::tag_code()) {
2086       // Parse Code attribute
2087       if (_need_verify) {
2088         guarantee_property(
2089             !access_flags.is_native() && !access_flags.is_abstract(),
2090                         "Code attribute in native or abstract methods in class file %s",
2091                          CHECK_(nullHandle));
2092       }
2093       if (parsed_code_attribute) {
2094         classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle));
2095       }
2096       parsed_code_attribute = true;
2097 
2098       // Stack size, locals size, and code size
2099       if (_major_version == 45 && _minor_version <= 2) {
2100         cfs->guarantee_more(4, CHECK_(nullHandle));
2101         max_stack = cfs->get_u1_fast();
2102         max_locals = cfs->get_u1_fast();
2103         code_length = cfs->get_u2_fast();
2104       } else {
2105         cfs->guarantee_more(8, CHECK_(nullHandle));
2106         max_stack = cfs->get_u2_fast();
2107         max_locals = cfs->get_u2_fast();
2108         code_length = cfs->get_u4_fast();
2109       }
2110       if (_need_verify) {
2111         guarantee_property(args_size <= max_locals,
2112                            "Arguments can't fit into locals in class file %s", CHECK_(nullHandle));
2113         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2114                            "Invalid method Code length %u in class file %s",
2115                            code_length, CHECK_(nullHandle));
2116       }
2117       // Code pointer
2118       code_start = cfs->get_u1_buffer();
2119       assert(code_start != NULL, "null code start");
2120       cfs->guarantee_more(code_length, CHECK_(nullHandle));
2121       cfs->skip_u1_fast(code_length);
2122 
2123       // Exception handler table
2124       cfs->guarantee_more(2, CHECK_(nullHandle));  // exception_table_length
2125       exception_table_length = cfs->get_u2_fast();
2126       if (exception_table_length > 0) {
2127         exception_table_start =
2128               parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle));
2129       }
2130 
2131       // Parse additional attributes in code attribute
2132       cfs->guarantee_more(2, CHECK_(nullHandle));  // code_attributes_count
2133       u2 code_attributes_count = cfs->get_u2_fast();
2134 
2135       unsigned int calculated_attribute_length = 0;
2136 
2137       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2138         calculated_attribute_length =
2139             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2140       } else {
2141         // max_stack, locals and length are smaller in pre-version 45.2 classes
2142         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2143       }
2144       calculated_attribute_length +=
2145         code_length +
2146         sizeof(exception_table_length) +
2147         sizeof(code_attributes_count) +
2148         exception_table_length *
2149             ( sizeof(u2) +   // start_pc
2150               sizeof(u2) +   // end_pc
2151               sizeof(u2) +   // handler_pc
2152               sizeof(u2) );  // catch_type_index
2153 
2154       while (code_attributes_count--) {
2155         cfs->guarantee_more(6, CHECK_(nullHandle));  // code_attribute_name_index, code_attribute_length
2156         u2 code_attribute_name_index = cfs->get_u2_fast();
2157         u4 code_attribute_length = cfs->get_u4_fast();
2158         calculated_attribute_length += code_attribute_length +
2159                                        sizeof(code_attribute_name_index) +
2160                                        sizeof(code_attribute_length);
2161         check_property(valid_symbol_at(code_attribute_name_index),
2162                        "Invalid code attribute name index %u in class file %s",
2163                        code_attribute_name_index,
2164                        CHECK_(nullHandle));
2165         if (LoadLineNumberTables &&
2166             _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2167           // Parse and compress line number table
2168           parse_linenumber_table(code_attribute_length, code_length,
2169             &linenumber_table, CHECK_(nullHandle));
2170 
2171         } else if (LoadLocalVariableTables &&
2172                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2173           // Parse local variable table
2174           if (!lvt_allocated) {
2175             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2176               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2177             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2178               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2179             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2180               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2181             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2182               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2183             lvt_allocated = true;
2184           }
2185           if (lvt_cnt == max_lvt_cnt) {
2186             max_lvt_cnt <<= 1;
2187             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2188             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2189           }
2190           localvariable_table_start[lvt_cnt] =
2191             parse_localvariable_table(code_length,
2192                                       max_locals,
2193                                       code_attribute_length,
2194                                       &localvariable_table_length[lvt_cnt],
2195                                       false,    // is not LVTT
2196                                       CHECK_(nullHandle));
2197           total_lvt_length += localvariable_table_length[lvt_cnt];
2198           lvt_cnt++;
2199         } else if (LoadLocalVariableTypeTables &&
2200                    _major_version >= JAVA_1_5_VERSION &&
2201                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2202           if (!lvt_allocated) {
2203             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2204               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2205             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2206               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2207             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2208               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2209             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2210               THREAD, u2*, INITIAL_MAX_LVT_NUMBER);
2211             lvt_allocated = true;
2212           }
2213           // Parse local variable type table
2214           if (lvtt_cnt == max_lvtt_cnt) {
2215             max_lvtt_cnt <<= 1;
2216             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2217             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2218           }
2219           localvariable_type_table_start[lvtt_cnt] =
2220             parse_localvariable_table(code_length,
2221                                       max_locals,
2222                                       code_attribute_length,
2223                                       &localvariable_type_table_length[lvtt_cnt],
2224                                       true,     // is LVTT
2225                                       CHECK_(nullHandle));
2226           lvtt_cnt++;
2227         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2228                    _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2229           // Stack map is only needed by the new verifier in JDK1.5.
2230           if (parsed_stackmap_attribute) {
2231             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle));
2232           }
2233           stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle));
2234           stackmap_data_length = code_attribute_length;
2235           parsed_stackmap_attribute = true;
2236         } else {
2237           // Skip unknown attributes
2238           cfs->skip_u1(code_attribute_length, CHECK_(nullHandle));
2239         }
2240       }
2241       // check method attribute length
2242       if (_need_verify) {
2243         guarantee_property(method_attribute_length == calculated_attribute_length,
2244                            "Code segment has wrong length in class file %s", CHECK_(nullHandle));
2245       }
2246     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2247       // Parse Exceptions attribute
2248       if (parsed_checked_exceptions_attribute) {
2249         classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle));
2250       }
2251       parsed_checked_exceptions_attribute = true;
2252       checked_exceptions_start =
2253             parse_checked_exceptions(&checked_exceptions_length,
2254                                      method_attribute_length,
2255                                      CHECK_(nullHandle));
2256     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2257       // reject multiple method parameters
2258       if (method_parameters_seen) {
2259         classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle));
2260       }
2261       method_parameters_seen = true;
2262       method_parameters_length = cfs->get_u1_fast();
2263       const u2 real_length = (method_parameters_length * 4u) + 1u;
2264       if (method_attribute_length != real_length) {
2265         classfile_parse_error(
2266           "Invalid MethodParameters method attribute length %u in class file",
2267           method_attribute_length, CHECK_(nullHandle));
2268       }
2269       method_parameters_data = cfs->get_u1_buffer();
2270       cfs->skip_u2_fast(method_parameters_length);
2271       cfs->skip_u2_fast(method_parameters_length);
2272       // ignore this attribute if it cannot be reflected
2273       if (!SystemDictionary::Parameter_klass_loaded())
2274         method_parameters_length = -1;
2275     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2276       if (method_attribute_length != 0) {
2277         classfile_parse_error(
2278           "Invalid Synthetic method attribute length %u in class file %s",
2279           method_attribute_length, CHECK_(nullHandle));
2280       }
2281       // Should we check that there hasn't already been a synthetic attribute?
2282       access_flags.set_is_synthetic();
2283     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2284       if (method_attribute_length != 0) {
2285         classfile_parse_error(
2286           "Invalid Deprecated method attribute length %u in class file %s",
2287           method_attribute_length, CHECK_(nullHandle));
2288       }
2289     } else if (_major_version >= JAVA_1_5_VERSION) {
2290       if (method_attribute_name == vmSymbols::tag_signature()) {
2291         if (method_attribute_length != 2) {
2292           classfile_parse_error(
2293             "Invalid Signature attribute length %u in class file %s",
2294             method_attribute_length, CHECK_(nullHandle));
2295         }
2296         generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle));
2297       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2298         if (runtime_visible_annotations != NULL) {
2299           classfile_parse_error(
2300             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2301         }
2302         runtime_visible_annotations_length = method_attribute_length;
2303         runtime_visible_annotations = cfs->get_u1_buffer();
2304         assert(runtime_visible_annotations != NULL, "null visible annotations");
2305         parse_annotations(runtime_visible_annotations,
2306             runtime_visible_annotations_length, &parsed_annotations);
2307         cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle));
2308       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2309         if (runtime_invisible_annotations_exists) {
2310           classfile_parse_error(
2311             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2312         }
2313         runtime_invisible_annotations_exists = true;
2314         if (PreserveAllAnnotations) {
2315           runtime_invisible_annotations_length = method_attribute_length;
2316           runtime_invisible_annotations = cfs->get_u1_buffer();
2317           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2318         }
2319         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2320       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2321         if (runtime_visible_parameter_annotations != NULL) {
2322           classfile_parse_error(
2323             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2324         }
2325         runtime_visible_parameter_annotations_length = method_attribute_length;
2326         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2327         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2328         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle));
2329       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2330         if (runtime_invisible_parameter_annotations_exists) {
2331           classfile_parse_error(
2332             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle));
2333         }
2334         runtime_invisible_parameter_annotations_exists = true;
2335         if (PreserveAllAnnotations) {
2336           runtime_invisible_parameter_annotations_length = method_attribute_length;
2337           runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2338           assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations");
2339         }
2340         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2341       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2342         if (annotation_default != NULL) {
2343           classfile_parse_error(
2344             "Multiple AnnotationDefault attributes for method in class file %s",
2345             CHECK_(nullHandle));
2346         }
2347         annotation_default_length = method_attribute_length;
2348         annotation_default = cfs->get_u1_buffer();
2349         assert(annotation_default != NULL, "null annotation default");
2350         cfs->skip_u1(annotation_default_length, CHECK_(nullHandle));
2351       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2352         if (runtime_visible_type_annotations != NULL) {
2353           classfile_parse_error(
2354             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2355             CHECK_(nullHandle));
2356         }
2357         runtime_visible_type_annotations_length = method_attribute_length;
2358         runtime_visible_type_annotations = cfs->get_u1_buffer();
2359         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2360         // No need for the VM to parse Type annotations
2361         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle));
2362       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2363         if (runtime_invisible_type_annotations_exists) {
2364           classfile_parse_error(
2365             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2366             CHECK_(nullHandle));
2367         } else {
2368           runtime_invisible_type_annotations_exists = true;
2369         }
2370         if (PreserveAllAnnotations) {
2371           runtime_invisible_type_annotations_length = method_attribute_length;
2372           runtime_invisible_type_annotations = cfs->get_u1_buffer();
2373           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2374         }
2375         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2376       } else {
2377         // Skip unknown attributes
2378         cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2379       }
2380     } else {
2381       // Skip unknown attributes
2382       cfs->skip_u1(method_attribute_length, CHECK_(nullHandle));
2383     }
2384   }
2385 
2386   if (linenumber_table != NULL) {
2387     linenumber_table->write_terminator();
2388     linenumber_table_length = linenumber_table->position();
2389   }
2390 
2391   // Make sure there's at least one Code attribute in non-native/non-abstract method
2392   if (_need_verify) {
2393     guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute,
2394                       "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle));
2395   }
2396 
2397   // All sizing information for a Method* is finally available, now create it
2398   InlineTableSizes sizes(
2399       total_lvt_length,
2400       linenumber_table_length,
2401       exception_table_length,
2402       checked_exceptions_length,
2403       method_parameters_length,
2404       generic_signature_index,
2405       runtime_visible_annotations_length +
2406            runtime_invisible_annotations_length,
2407       runtime_visible_parameter_annotations_length +
2408            runtime_invisible_parameter_annotations_length,
2409       runtime_visible_type_annotations_length +
2410            runtime_invisible_type_annotations_length,
2411       annotation_default_length,
2412       0);
2413 
2414   Method* m = Method::allocate(
2415       _loader_data, code_length, access_flags, &sizes,
2416       ConstMethod::NORMAL, CHECK_(nullHandle));
2417 
2418   ClassLoadingService::add_class_method_size(m->size()*HeapWordSize);
2419 
2420   // Fill in information from fixed part (access_flags already set)
2421   m->set_constants(_cp);
2422   m->set_name_index(name_index);
2423   m->set_signature_index(signature_index);
2424 #ifdef CC_INTERP
2425   // hmm is there a gc issue here??
2426   ResultTypeFinder rtf(_cp->symbol_at(signature_index));
2427   m->set_result_index(rtf.type());
2428 #endif
2429 
2430   if (args_size >= 0) {
2431     m->set_size_of_parameters(args_size);
2432   } else {
2433     m->compute_size_of_parameters(THREAD);
2434   }
2435 #ifdef ASSERT
2436   if (args_size >= 0) {
2437     m->compute_size_of_parameters(THREAD);
2438     assert(args_size == m->size_of_parameters(), "");
2439   }
2440 #endif
2441 
2442   // Fill in code attribute information
2443   m->set_max_stack(max_stack);
2444   m->set_max_locals(max_locals);
2445   if (stackmap_data != NULL) {
2446     m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data,
2447                                          stackmap_data_length, CHECK_NULL);
2448   }
2449 
2450   // Copy byte codes
2451   m->set_code(code_start);
2452 
2453   // Copy line number table
2454   if (linenumber_table != NULL) {
2455     memcpy(m->compressed_linenumber_table(),
2456            linenumber_table->buffer(), linenumber_table_length);
2457   }
2458 
2459   // Copy exception table
2460   if (exception_table_length > 0) {
2461     int size =
2462       exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2463     copy_u2_with_conversion((u2*) m->exception_table_start(),
2464                              exception_table_start, size);
2465   }
2466 
2467   // Copy method parameters
2468   if (method_parameters_length > 0) {
2469     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2470     for (int i = 0; i < method_parameters_length; i++) {
2471       elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data);
2472       method_parameters_data += 2;
2473       elem[i].flags = Bytes::get_Java_u2(method_parameters_data);
2474       method_parameters_data += 2;
2475     }
2476   }
2477 
2478   // Copy checked exceptions
2479   if (checked_exceptions_length > 0) {
2480     int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2481     copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size);
2482   }
2483 
2484   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2485   if (total_lvt_length > 0) {
2486     promoted_flags->set_has_localvariable_table();
2487     copy_localvariable_table(m->constMethod(), lvt_cnt,
2488                              localvariable_table_length,
2489                              localvariable_table_start,
2490                              lvtt_cnt,
2491                              localvariable_type_table_length,
2492                              localvariable_type_table_start, CHECK_NULL);
2493   }
2494 
2495   if (parsed_annotations.has_any_annotations())
2496     parsed_annotations.apply_to(m);
2497 
2498   // Copy annotations
2499   copy_method_annotations(m->constMethod(),
2500                           runtime_visible_annotations,
2501                           runtime_visible_annotations_length,
2502                           runtime_invisible_annotations,
2503                           runtime_invisible_annotations_length,
2504                           runtime_visible_parameter_annotations,
2505                           runtime_visible_parameter_annotations_length,
2506                           runtime_invisible_parameter_annotations,
2507                           runtime_invisible_parameter_annotations_length,
2508                           runtime_visible_type_annotations,
2509                           runtime_visible_type_annotations_length,
2510                           runtime_invisible_type_annotations,
2511                           runtime_invisible_type_annotations_length,
2512                           annotation_default,
2513                           annotation_default_length,
2514                           CHECK_NULL);
2515 
2516   if (name == vmSymbols::finalize_method_name() &&
2517       signature == vmSymbols::void_method_signature()) {
2518     if (m->is_empty_method()) {
2519       _has_empty_finalizer = true;
2520     } else {
2521       _has_finalizer = true;
2522     }
2523   }
2524   if (name == vmSymbols::object_initializer_name() &&
2525       signature == vmSymbols::void_method_signature() &&
2526       m->is_vanilla_constructor()) {
2527     _has_vanilla_constructor = true;
2528   }
2529 
2530   NOT_PRODUCT(m->verify());
2531   return m;
2532 }
2533 
2534 
2535 // The promoted_flags parameter is used to pass relevant access_flags
2536 // from the methods back up to the containing klass. These flag values
2537 // are added to klass's access_flags.
2538 
2539 Array<Method*>* ClassFileParser::parse_methods(bool is_interface,
2540                                                AccessFlags* promoted_flags,
2541                                                bool* has_final_method,
2542                                                bool* declares_default_methods,
2543                                                TRAPS) {
2544   ClassFileStream* cfs = stream();
2545   cfs->guarantee_more(2, CHECK_NULL);  // length
2546   u2 length = cfs->get_u2_fast();
2547   if (length == 0) {
2548     _methods = Universe::the_empty_method_array();
2549   } else {
2550     _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL);
2551 
2552     HandleMark hm(THREAD);
2553     for (int index = 0; index < length; index++) {
2554       methodHandle method = parse_method(is_interface,
2555                                          promoted_flags,
2556                                          CHECK_NULL);
2557 
2558       if (method->is_final()) {
2559         *has_final_method = true;
2560       }
2561       // declares_default_methods: declares concrete instance methods, any access flags
2562       // used for interface initialization, and default method inheritance analysis
2563       if (is_interface && !(*declares_default_methods)
2564         && !method->is_abstract() && !method->is_static()) {
2565         *declares_default_methods = true;
2566       }
2567       _methods->at_put(index, method());
2568     }
2569 
2570     if (_need_verify && length > 1) {
2571       // Check duplicated methods
2572       ResourceMark rm(THREAD);
2573       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2574         THREAD, NameSigHash*, HASH_ROW_SIZE);
2575       initialize_hashtable(names_and_sigs);
2576       bool dup = false;
2577       {
2578         debug_only(No_Safepoint_Verifier nsv;)
2579         for (int i = 0; i < length; i++) {
2580           Method* m = _methods->at(i);
2581           // If no duplicates, add name/signature in hashtable names_and_sigs.
2582           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2583             dup = true;
2584             break;
2585           }
2586         }
2587       }
2588       if (dup) {
2589         classfile_parse_error("Duplicate method name&signature in class file %s",
2590                               CHECK_NULL);
2591       }
2592     }
2593   }
2594   return _methods;
2595 }
2596 
2597 
2598 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) {
2599   int length = methods->length();
2600   // If JVMTI original method ordering or sharing is enabled we have to
2601   // remember the original class file ordering.
2602   // We temporarily use the vtable_index field in the Method* to store the
2603   // class file index, so we can read in after calling qsort.
2604   // Put the method ordering in the shared archive.
2605   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2606     for (int index = 0; index < length; index++) {
2607       Method* m = methods->at(index);
2608       assert(!m->valid_vtable_index(), "vtable index should not be set");
2609       m->set_vtable_index(index);
2610     }
2611   }
2612   // Sort method array by ascending method name (for faster lookups & vtable construction)
2613   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2614   Method::sort_methods(methods);
2615 
2616   intArray* method_ordering = NULL;
2617   // If JVMTI original method ordering or sharing is enabled construct int
2618   // array remembering the original ordering
2619   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2620     method_ordering = new intArray(length);
2621     for (int index = 0; index < length; index++) {
2622       Method* m = methods->at(index);
2623       int old_index = m->vtable_index();
2624       assert(old_index >= 0 && old_index < length, "invalid method index");
2625       method_ordering->at_put(index, old_index);
2626       m->set_vtable_index(Method::invalid_vtable_index);
2627     }
2628   }
2629   return method_ordering;
2630 }
2631 
2632 // Parse generic_signature attribute for methods and fields
2633 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) {
2634   ClassFileStream* cfs = stream();
2635   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2636   u2 generic_signature_index = cfs->get_u2_fast();
2637   check_property(
2638     valid_symbol_at(generic_signature_index),
2639     "Invalid Signature attribute at constant pool index %u in class file %s",
2640     generic_signature_index, CHECK_0);
2641   return generic_signature_index;
2642 }
2643 
2644 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) {
2645   ClassFileStream* cfs = stream();
2646   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2647   u2 sourcefile_index = cfs->get_u2_fast();
2648   check_property(
2649     valid_symbol_at(sourcefile_index),
2650     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2651     sourcefile_index, CHECK);
2652   set_class_sourcefile_index(sourcefile_index);
2653 }
2654 
2655 
2656 
2657 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) {
2658   ClassFileStream* cfs = stream();
2659   u1* sde_buffer = cfs->get_u1_buffer();
2660   assert(sde_buffer != NULL, "null sde buffer");
2661 
2662   // Don't bother storing it if there is no way to retrieve it
2663   if (JvmtiExport::can_get_source_debug_extension()) {
2664     assert((length+1) > length, "Overflow checking");
2665     u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2666     for (int i = 0; i < length; i++) {
2667       sde[i] = sde_buffer[i];
2668     }
2669     sde[length] = '\0';
2670     set_class_sde_buffer((char*)sde, length);
2671   }
2672   // Got utf8 string, set stream position forward
2673   cfs->skip_u1(length, CHECK);
2674 }
2675 
2676 
2677 // Inner classes can be static, private or protected (classic VM does this)
2678 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC)
2679 
2680 // Return number of classes in the inner classes attribute table
2681 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start,
2682                                                             bool parsed_enclosingmethod_attribute,
2683                                                             u2 enclosing_method_class_index,
2684                                                             u2 enclosing_method_method_index,
2685                                                             TRAPS) {
2686   ClassFileStream* cfs = stream();
2687   u1* current_mark = cfs->current();
2688   u2 length = 0;
2689   if (inner_classes_attribute_start != NULL) {
2690     cfs->set_current(inner_classes_attribute_start);
2691     cfs->guarantee_more(2, CHECK_0);  // length
2692     length = cfs->get_u2_fast();
2693   }
2694 
2695   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
2696   // method data:
2697   //   [inner_class_info_index,
2698   //    outer_class_info_index,
2699   //    inner_name_index,
2700   //    inner_class_access_flags,
2701   //    ...
2702   //    enclosing_method_class_index,
2703   //    enclosing_method_method_index]
2704   int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
2705   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
2706   _inner_classes = inner_classes;
2707 
2708   int index = 0;
2709   int cp_size = _cp->length();
2710   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
2711   for (int n = 0; n < length; n++) {
2712     // Inner class index
2713     u2 inner_class_info_index = cfs->get_u2_fast();
2714     check_property(
2715       valid_klass_reference_at(inner_class_info_index),
2716       "inner_class_info_index %u has bad constant type in class file %s",
2717       inner_class_info_index, CHECK_0);
2718     // Outer class index
2719     u2 outer_class_info_index = cfs->get_u2_fast();
2720     check_property(
2721       outer_class_info_index == 0 ||
2722         valid_klass_reference_at(outer_class_info_index),
2723       "outer_class_info_index %u has bad constant type in class file %s",
2724       outer_class_info_index, CHECK_0);
2725     // Inner class name
2726     u2 inner_name_index = cfs->get_u2_fast();
2727     check_property(
2728       inner_name_index == 0 || valid_symbol_at(inner_name_index),
2729       "inner_name_index %u has bad constant type in class file %s",
2730       inner_name_index, CHECK_0);
2731     if (_need_verify) {
2732       guarantee_property(inner_class_info_index != outer_class_info_index,
2733                          "Class is both outer and inner class in class file %s", CHECK_0);
2734     }
2735     // Access flags
2736     AccessFlags inner_access_flags;
2737     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2738     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2739       // Set abstract bit for old class files for backward compatibility
2740       flags |= JVM_ACC_ABSTRACT;
2741     }
2742     verify_legal_class_modifiers(flags, CHECK_0);
2743     inner_access_flags.set_flags(flags);
2744 
2745     inner_classes->at_put(index++, inner_class_info_index);
2746     inner_classes->at_put(index++, outer_class_info_index);
2747     inner_classes->at_put(index++, inner_name_index);
2748     inner_classes->at_put(index++, inner_access_flags.as_short());
2749   }
2750 
2751   // 4347400: make sure there's no duplicate entry in the classes array
2752   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
2753     for(int i = 0; i < length * 4; i += 4) {
2754       for(int j = i + 4; j < length * 4; j += 4) {
2755         guarantee_property((inner_classes->at(i)   != inner_classes->at(j) ||
2756                             inner_classes->at(i+1) != inner_classes->at(j+1) ||
2757                             inner_classes->at(i+2) != inner_classes->at(j+2) ||
2758                             inner_classes->at(i+3) != inner_classes->at(j+3)),
2759                             "Duplicate entry in InnerClasses in class file %s",
2760                             CHECK_0);
2761       }
2762     }
2763   }
2764 
2765   // Set EnclosingMethod class and method indexes.
2766   if (parsed_enclosingmethod_attribute) {
2767     inner_classes->at_put(index++, enclosing_method_class_index);
2768     inner_classes->at_put(index++, enclosing_method_method_index);
2769   }
2770   assert(index == size, "wrong size");
2771 
2772   // Restore buffer's current position.
2773   cfs->set_current(current_mark);
2774 
2775   return length;
2776 }
2777 
2778 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
2779   set_class_synthetic_flag(true);
2780 }
2781 
2782 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) {
2783   ClassFileStream* cfs = stream();
2784   u2 signature_index = cfs->get_u2(CHECK);
2785   check_property(
2786     valid_symbol_at(signature_index),
2787     "Invalid constant pool index %u in Signature attribute in class file %s",
2788     signature_index, CHECK);
2789   set_class_generic_signature_index(signature_index);
2790 }
2791 
2792 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) {
2793   ClassFileStream* cfs = stream();
2794   u1* current_start = cfs->current();
2795 
2796   guarantee_property(attribute_byte_length >= sizeof(u2),
2797                      "Invalid BootstrapMethods attribute length %u in class file %s",
2798                      attribute_byte_length,
2799                      CHECK);
2800 
2801   cfs->guarantee_more(attribute_byte_length, CHECK);
2802 
2803   int attribute_array_length = cfs->get_u2_fast();
2804 
2805   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
2806                      "Short length on BootstrapMethods in class file %s",
2807                      CHECK);
2808 
2809 
2810   // The attribute contains a counted array of counted tuples of shorts,
2811   // represending bootstrap specifiers:
2812   //    length*{bootstrap_method_index, argument_count*{argument_index}}
2813   int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
2814   // operand_count = number of shorts in attr, except for leading length
2815 
2816   // The attribute is copied into a short[] array.
2817   // The array begins with a series of short[2] pairs, one for each tuple.
2818   int index_size = (attribute_array_length * 2);
2819 
2820   Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
2821 
2822   // Eagerly assign operands so they will be deallocated with the constant
2823   // pool if there is an error.
2824   _cp->set_operands(operands);
2825 
2826   int operand_fill_index = index_size;
2827   int cp_size = _cp->length();
2828 
2829   for (int n = 0; n < attribute_array_length; n++) {
2830     // Store a 32-bit offset into the header of the operand array.
2831     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
2832 
2833     // Read a bootstrap specifier.
2834     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
2835     u2 bootstrap_method_index = cfs->get_u2_fast();
2836     u2 argument_count = cfs->get_u2_fast();
2837     check_property(
2838       valid_cp_range(bootstrap_method_index, cp_size) &&
2839       _cp->tag_at(bootstrap_method_index).is_method_handle(),
2840       "bootstrap_method_index %u has bad constant type in class file %s",
2841       bootstrap_method_index,
2842       CHECK);
2843 
2844     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
2845       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
2846       CHECK);
2847 
2848     operands->at_put(operand_fill_index++, bootstrap_method_index);
2849     operands->at_put(operand_fill_index++, argument_count);
2850 
2851     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
2852     for (int j = 0; j < argument_count; j++) {
2853       u2 argument_index = cfs->get_u2_fast();
2854       check_property(
2855         valid_cp_range(argument_index, cp_size) &&
2856         _cp->tag_at(argument_index).is_loadable_constant(),
2857         "argument_index %u has bad constant type in class file %s",
2858         argument_index,
2859         CHECK);
2860       operands->at_put(operand_fill_index++, argument_index);
2861     }
2862   }
2863 
2864   u1* current_end = cfs->current();
2865   guarantee_property(current_end == current_start + attribute_byte_length,
2866                      "Bad length on BootstrapMethods in class file %s",
2867                      CHECK);
2868 }
2869 
2870 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations,
2871                                                  TRAPS) {
2872   ClassFileStream* cfs = stream();
2873   // Set inner classes attribute to default sentinel
2874   _inner_classes = Universe::the_empty_short_array();
2875   cfs->guarantee_more(2, CHECK);  // attributes_count
2876   u2 attributes_count = cfs->get_u2_fast();
2877   bool parsed_sourcefile_attribute = false;
2878   bool parsed_innerclasses_attribute = false;
2879   bool parsed_enclosingmethod_attribute = false;
2880   bool parsed_bootstrap_methods_attribute = false;
2881   u1* runtime_visible_annotations = NULL;
2882   int runtime_visible_annotations_length = 0;
2883   u1* runtime_invisible_annotations = NULL;
2884   int runtime_invisible_annotations_length = 0;
2885   u1* runtime_visible_type_annotations = NULL;
2886   int runtime_visible_type_annotations_length = 0;
2887   u1* runtime_invisible_type_annotations = NULL;
2888   int runtime_invisible_type_annotations_length = 0;
2889   bool runtime_invisible_type_annotations_exists = false;
2890   bool runtime_invisible_annotations_exists = false;
2891   bool parsed_source_debug_ext_annotations_exist = false;
2892   u1* inner_classes_attribute_start = NULL;
2893   u4  inner_classes_attribute_length = 0;
2894   u2  enclosing_method_class_index = 0;
2895   u2  enclosing_method_method_index = 0;
2896   // Iterate over attributes
2897   while (attributes_count--) {
2898     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
2899     u2 attribute_name_index = cfs->get_u2_fast();
2900     u4 attribute_length = cfs->get_u4_fast();
2901     check_property(
2902       valid_symbol_at(attribute_name_index),
2903       "Attribute name has bad constant pool index %u in class file %s",
2904       attribute_name_index, CHECK);
2905     Symbol* tag = _cp->symbol_at(attribute_name_index);
2906     if (tag == vmSymbols::tag_source_file()) {
2907       // Check for SourceFile tag
2908       if (_need_verify) {
2909         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
2910       }
2911       if (parsed_sourcefile_attribute) {
2912         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
2913       } else {
2914         parsed_sourcefile_attribute = true;
2915       }
2916       parse_classfile_sourcefile_attribute(CHECK);
2917     } else if (tag == vmSymbols::tag_source_debug_extension()) {
2918       // Check for SourceDebugExtension tag
2919       if (parsed_source_debug_ext_annotations_exist) {
2920           classfile_parse_error(
2921             "Multiple SourceDebugExtension attributes in class file %s", CHECK);
2922       }
2923       parsed_source_debug_ext_annotations_exist = true;
2924       parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK);
2925     } else if (tag == vmSymbols::tag_inner_classes()) {
2926       // Check for InnerClasses tag
2927       if (parsed_innerclasses_attribute) {
2928         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
2929       } else {
2930         parsed_innerclasses_attribute = true;
2931       }
2932       inner_classes_attribute_start = cfs->get_u1_buffer();
2933       inner_classes_attribute_length = attribute_length;
2934       cfs->skip_u1(inner_classes_attribute_length, CHECK);
2935     } else if (tag == vmSymbols::tag_synthetic()) {
2936       // Check for Synthetic tag
2937       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
2938       if (attribute_length != 0) {
2939         classfile_parse_error(
2940           "Invalid Synthetic classfile attribute length %u in class file %s",
2941           attribute_length, CHECK);
2942       }
2943       parse_classfile_synthetic_attribute(CHECK);
2944     } else if (tag == vmSymbols::tag_deprecated()) {
2945       // Check for Deprecatd tag - 4276120
2946       if (attribute_length != 0) {
2947         classfile_parse_error(
2948           "Invalid Deprecated classfile attribute length %u in class file %s",
2949           attribute_length, CHECK);
2950       }
2951     } else if (_major_version >= JAVA_1_5_VERSION) {
2952       if (tag == vmSymbols::tag_signature()) {
2953         if (attribute_length != 2) {
2954           classfile_parse_error(
2955             "Wrong Signature attribute length %u in class file %s",
2956             attribute_length, CHECK);
2957         }
2958         parse_classfile_signature_attribute(CHECK);
2959       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
2960         if (runtime_visible_annotations != NULL) {
2961           classfile_parse_error(
2962             "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
2963         }
2964         runtime_visible_annotations_length = attribute_length;
2965         runtime_visible_annotations = cfs->get_u1_buffer();
2966         assert(runtime_visible_annotations != NULL, "null visible annotations");
2967         parse_annotations(runtime_visible_annotations,
2968                           runtime_visible_annotations_length,
2969                           parsed_annotations);
2970         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
2971       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
2972         if (runtime_invisible_annotations_exists) {
2973           classfile_parse_error(
2974             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
2975         }
2976         runtime_invisible_annotations_exists = true;
2977         if (PreserveAllAnnotations) {
2978           runtime_invisible_annotations_length = attribute_length;
2979           runtime_invisible_annotations = cfs->get_u1_buffer();
2980           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2981         }
2982         cfs->skip_u1(attribute_length, CHECK);
2983       } else if (tag == vmSymbols::tag_enclosing_method()) {
2984         if (parsed_enclosingmethod_attribute) {
2985           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
2986         } else {
2987           parsed_enclosingmethod_attribute = true;
2988         }
2989         guarantee_property(attribute_length == 4,
2990           "Wrong EnclosingMethod attribute length %u in class file %s",
2991           attribute_length, CHECK);
2992         cfs->guarantee_more(4, CHECK);  // class_index, method_index
2993         enclosing_method_class_index  = cfs->get_u2_fast();
2994         enclosing_method_method_index = cfs->get_u2_fast();
2995         if (enclosing_method_class_index == 0) {
2996           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
2997         }
2998         // Validate the constant pool indices and types
2999         check_property(valid_klass_reference_at(enclosing_method_class_index),
3000           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3001         if (enclosing_method_method_index != 0 &&
3002             (!_cp->is_within_bounds(enclosing_method_method_index) ||
3003              !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3004           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3005         }
3006       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3007                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3008         if (parsed_bootstrap_methods_attribute)
3009           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3010         parsed_bootstrap_methods_attribute = true;
3011         parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK);
3012       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3013         if (runtime_visible_type_annotations != NULL) {
3014           classfile_parse_error(
3015             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3016         }
3017         runtime_visible_type_annotations_length = attribute_length;
3018         runtime_visible_type_annotations = cfs->get_u1_buffer();
3019         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3020         // No need for the VM to parse Type annotations
3021         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3022       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3023         if (runtime_invisible_type_annotations_exists) {
3024           classfile_parse_error(
3025             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3026         } else {
3027           runtime_invisible_type_annotations_exists = true;
3028         }
3029         if (PreserveAllAnnotations) {
3030           runtime_invisible_type_annotations_length = attribute_length;
3031           runtime_invisible_type_annotations = cfs->get_u1_buffer();
3032           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3033         }
3034         cfs->skip_u1(attribute_length, CHECK);
3035       } else {
3036         // Unknown attribute
3037         cfs->skip_u1(attribute_length, CHECK);
3038       }
3039     } else {
3040       // Unknown attribute
3041       cfs->skip_u1(attribute_length, CHECK);
3042     }
3043   }
3044   _annotations = assemble_annotations(runtime_visible_annotations,
3045                                       runtime_visible_annotations_length,
3046                                       runtime_invisible_annotations,
3047                                       runtime_invisible_annotations_length,
3048                                       CHECK);
3049   _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3050                                            runtime_visible_type_annotations_length,
3051                                            runtime_invisible_type_annotations,
3052                                            runtime_invisible_type_annotations_length,
3053                                            CHECK);
3054 
3055   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3056     u2 num_of_classes = parse_classfile_inner_classes_attribute(
3057                             inner_classes_attribute_start,
3058                             parsed_innerclasses_attribute,
3059                             enclosing_method_class_index,
3060                             enclosing_method_method_index,
3061                             CHECK);
3062     if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3063       guarantee_property(
3064         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3065         "Wrong InnerClasses attribute length in class file %s", CHECK);
3066     }
3067   }
3068 
3069   if (_max_bootstrap_specifier_index >= 0) {
3070     guarantee_property(parsed_bootstrap_methods_attribute,
3071                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3072   }
3073 }
3074 
3075 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) {
3076   if (_synthetic_flag)
3077     k->set_is_synthetic();
3078   if (_sourcefile_index != 0) {
3079     k->set_source_file_name_index(_sourcefile_index);
3080   }
3081   if (_generic_signature_index != 0) {
3082     k->set_generic_signature_index(_generic_signature_index);
3083   }
3084   if (_sde_buffer != NULL) {
3085     k->set_source_debug_extension(_sde_buffer, _sde_length);
3086   }
3087 }
3088 
3089 // Create the Annotations object that will
3090 // hold the annotations array for the Klass.
3091 void ClassFileParser::create_combined_annotations(TRAPS) {
3092     if (_annotations == NULL &&
3093         _type_annotations == NULL &&
3094         _fields_annotations == NULL &&
3095         _fields_type_annotations == NULL) {
3096       // Don't create the Annotations object unnecessarily.
3097       return;
3098     }
3099 
3100     Annotations* annotations = Annotations::allocate(_loader_data, CHECK);
3101     annotations->set_class_annotations(_annotations);
3102     annotations->set_class_type_annotations(_type_annotations);
3103     annotations->set_fields_annotations(_fields_annotations);
3104     annotations->set_fields_type_annotations(_fields_type_annotations);
3105 
3106     // This is the Annotations object that will be
3107     // assigned to InstanceKlass being constructed.
3108     _combined_annotations = annotations;
3109 
3110     // The annotations arrays below has been transfered the
3111     // _combined_annotations so these fields can now be cleared.
3112     _annotations             = NULL;
3113     _type_annotations        = NULL;
3114     _fields_annotations      = NULL;
3115     _fields_type_annotations = NULL;
3116 }
3117 
3118 // Transfer ownership of metadata allocated to the InstanceKlass.
3119 void ClassFileParser::apply_parsed_class_metadata(
3120                                             instanceKlassHandle this_klass,
3121                                             int java_fields_count, TRAPS) {
3122   _cp->set_pool_holder(this_klass());
3123   this_klass->set_constants(_cp);
3124   this_klass->set_fields(_fields, java_fields_count);
3125   this_klass->set_methods(_methods);
3126   this_klass->set_inner_classes(_inner_classes);
3127   this_klass->set_local_interfaces(_local_interfaces);
3128   this_klass->set_transitive_interfaces(_transitive_interfaces);
3129   this_klass->set_annotations(_combined_annotations);
3130 
3131   // Clear out these fields so they don't get deallocated by the destructor
3132   clear_class_metadata();
3133 }
3134 
3135 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations,
3136                                                        int runtime_visible_annotations_length,
3137                                                        u1* runtime_invisible_annotations,
3138                                                        int runtime_invisible_annotations_length, TRAPS) {
3139   AnnotationArray* annotations = NULL;
3140   if (runtime_visible_annotations != NULL ||
3141       runtime_invisible_annotations != NULL) {
3142     annotations = MetadataFactory::new_array<u1>(_loader_data,
3143                                           runtime_visible_annotations_length +
3144                                           runtime_invisible_annotations_length,
3145                                           CHECK_(annotations));
3146     if (runtime_visible_annotations != NULL) {
3147       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3148         annotations->at_put(i, runtime_visible_annotations[i]);
3149       }
3150     }
3151     if (runtime_invisible_annotations != NULL) {
3152       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3153         int append = runtime_visible_annotations_length+i;
3154         annotations->at_put(append, runtime_invisible_annotations[i]);
3155       }
3156     }
3157   }
3158   return annotations;
3159 }
3160 
3161 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index,
3162                                                        TRAPS) {
3163   instanceKlassHandle super_klass;
3164   if (super_class_index == 0) {
3165     check_property(_class_name == vmSymbols::java_lang_Object(),
3166                    "Invalid superclass index %u in class file %s",
3167                    super_class_index,
3168                    CHECK_NULL);
3169   } else {
3170     check_property(valid_klass_reference_at(super_class_index),
3171                    "Invalid superclass index %u in class file %s",
3172                    super_class_index,
3173                    CHECK_NULL);
3174     // The class name should be legal because it is checked when parsing constant pool.
3175     // However, make sure it is not an array type.
3176     bool is_array = false;
3177     if (_cp->tag_at(super_class_index).is_klass()) {
3178       super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index));
3179       if (_need_verify) {
3180         is_array = super_klass->is_array_klass();
3181       }
3182     } else if (_need_verify) {
3183       is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3184     }
3185     if (_need_verify) {
3186       guarantee_property(!is_array,
3187                         "Bad superclass name in class file %s", CHECK_NULL);
3188     }
3189   }
3190   return super_klass;
3191 }
3192 
3193 
3194 // Values needed for oopmap and InstanceKlass creation
3195 class FieldLayoutInfo : public StackObj {
3196  public:
3197   int*          nonstatic_oop_offsets;
3198   unsigned int* nonstatic_oop_counts;
3199   unsigned int  nonstatic_oop_map_count;
3200   unsigned int  total_oop_map_count;
3201   int           instance_size;
3202   int           nonstatic_field_size;
3203   int           static_field_size;
3204   bool          has_nonstatic_fields;
3205 };
3206 
3207 // Layout fields and fill in FieldLayoutInfo.  Could use more refactoring!
3208 void ClassFileParser::layout_fields(Handle class_loader,
3209                                     FieldAllocationCount* fac,
3210                                     ClassAnnotationCollector* parsed_annotations,
3211                                     FieldLayoutInfo* info,
3212                                     TRAPS) {
3213 
3214   // Field size and offset computation
3215   int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size();
3216   int next_static_oop_offset = 0;
3217   int next_static_double_offset = 0;
3218   int next_static_word_offset = 0;
3219   int next_static_short_offset = 0;
3220   int next_static_byte_offset = 0;
3221   int next_nonstatic_oop_offset = 0;
3222   int next_nonstatic_double_offset = 0;
3223   int next_nonstatic_word_offset = 0;
3224   int next_nonstatic_short_offset = 0;
3225   int next_nonstatic_byte_offset = 0;
3226   int first_nonstatic_oop_offset = 0;
3227   int next_nonstatic_field_offset = 0;
3228   int next_nonstatic_padded_offset = 0;
3229 
3230   // Count the contended fields by type.
3231   //
3232   // We ignore static fields, because @Contended is not supported for them.
3233   // The layout code below will also ignore the static fields.
3234   int nonstatic_contended_count = 0;
3235   FieldAllocationCount fac_contended;
3236   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3237     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3238     if (fs.is_contended()) {
3239       fac_contended.count[atype]++;
3240       if (!fs.access_flags().is_static()) {
3241         nonstatic_contended_count++;
3242       }
3243     }
3244   }
3245 
3246 
3247   // Calculate the starting byte offsets
3248   next_static_oop_offset      = InstanceMirrorKlass::offset_of_static_fields();
3249   next_static_double_offset   = next_static_oop_offset +
3250                                 ((fac->count[STATIC_OOP]) * heapOopSize);
3251   if ( fac->count[STATIC_DOUBLE] &&
3252        (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3253         Universe::field_type_should_be_aligned(T_LONG)) ) {
3254     next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3255   }
3256 
3257   next_static_word_offset     = next_static_double_offset +
3258                                 ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3259   next_static_short_offset    = next_static_word_offset +
3260                                 ((fac->count[STATIC_WORD]) * BytesPerInt);
3261   next_static_byte_offset     = next_static_short_offset +
3262                                 ((fac->count[STATIC_SHORT]) * BytesPerShort);
3263 
3264   int nonstatic_fields_start  = instanceOopDesc::base_offset_in_bytes() +
3265                                 nonstatic_field_size * heapOopSize;
3266 
3267   next_nonstatic_field_offset = nonstatic_fields_start;
3268 
3269   bool is_contended_class     = parsed_annotations->is_contended();
3270 
3271   // Class is contended, pad before all the fields
3272   if (is_contended_class) {
3273     next_nonstatic_field_offset += ContendedPaddingWidth;
3274   }
3275 
3276   // Compute the non-contended fields count.
3277   // The packing code below relies on these counts to determine if some field
3278   // can be squeezed into the alignment gap. Contended fields are obviously
3279   // exempt from that.
3280   unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3281   unsigned int nonstatic_word_count   = fac->count[NONSTATIC_WORD]   - fac_contended.count[NONSTATIC_WORD];
3282   unsigned int nonstatic_short_count  = fac->count[NONSTATIC_SHORT]  - fac_contended.count[NONSTATIC_SHORT];
3283   unsigned int nonstatic_byte_count   = fac->count[NONSTATIC_BYTE]   - fac_contended.count[NONSTATIC_BYTE];
3284   unsigned int nonstatic_oop_count    = fac->count[NONSTATIC_OOP]    - fac_contended.count[NONSTATIC_OOP];
3285 
3286   // Total non-static fields count, including every contended field
3287   unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3288                                         fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3289                                         fac->count[NONSTATIC_OOP];
3290 
3291   bool super_has_nonstatic_fields =
3292           (_super_klass() != NULL && _super_klass->has_nonstatic_fields());
3293   bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3294 
3295 
3296   // Prepare list of oops for oop map generation.
3297   //
3298   // "offset" and "count" lists are describing the set of contiguous oop
3299   // regions. offset[i] is the start of the i-th region, which then has
3300   // count[i] oops following. Before we know how many regions are required,
3301   // we pessimistically allocate the maps to fit all the oops into the
3302   // distinct regions.
3303   //
3304   // TODO: We add +1 to always allocate non-zero resource arrays; we need
3305   // to figure out if we still need to do this.
3306   int* nonstatic_oop_offsets;
3307   unsigned int* nonstatic_oop_counts;
3308   unsigned int nonstatic_oop_map_count = 0;
3309   unsigned int max_nonstatic_oop_maps  = fac->count[NONSTATIC_OOP] + 1;
3310 
3311   nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3312             THREAD, int, max_nonstatic_oop_maps);
3313   nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
3314             THREAD, unsigned int, max_nonstatic_oop_maps);
3315 
3316   first_nonstatic_oop_offset = 0; // will be set for first oop field
3317 
3318   bool compact_fields   = CompactFields;
3319   int  allocation_style = FieldsAllocationStyle;
3320   if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3321     assert(false, "0 <= FieldsAllocationStyle <= 2");
3322     allocation_style = 1; // Optimistic
3323   }
3324 
3325   // The next classes have predefined hard-coded fields offsets
3326   // (see in JavaClasses::compute_hard_coded_offsets()).
3327   // Use default fields allocation order for them.
3328   if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() &&
3329       (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3330        _class_name == vmSymbols::java_lang_Class() ||
3331        _class_name == vmSymbols::java_lang_ClassLoader() ||
3332        _class_name == vmSymbols::java_lang_ref_Reference() ||
3333        _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3334        _class_name == vmSymbols::java_lang_StackTraceElement() ||
3335        _class_name == vmSymbols::java_lang_String() ||
3336        _class_name == vmSymbols::java_lang_Throwable() ||
3337        _class_name == vmSymbols::java_lang_Boolean() ||
3338        _class_name == vmSymbols::java_lang_Character() ||
3339        _class_name == vmSymbols::java_lang_Float() ||
3340        _class_name == vmSymbols::java_lang_Double() ||
3341        _class_name == vmSymbols::java_lang_Byte() ||
3342        _class_name == vmSymbols::java_lang_Short() ||
3343        _class_name == vmSymbols::java_lang_Integer() ||
3344        _class_name == vmSymbols::java_lang_Long())) {
3345     allocation_style = 0;     // Allocate oops first
3346     compact_fields   = false; // Don't compact fields
3347   }
3348 
3349   // Rearrange fields for a given allocation style
3350   if( allocation_style == 0 ) {
3351     // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3352     next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3353     next_nonstatic_double_offset = next_nonstatic_oop_offset +
3354                                     (nonstatic_oop_count * heapOopSize);
3355   } else if( allocation_style == 1 ) {
3356     // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3357     next_nonstatic_double_offset = next_nonstatic_field_offset;
3358   } else if( allocation_style == 2 ) {
3359     // Fields allocation: oops fields in super and sub classes are together.
3360     if( nonstatic_field_size > 0 && _super_klass() != NULL &&
3361         _super_klass->nonstatic_oop_map_size() > 0 ) {
3362       unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3363       OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps();
3364       OopMapBlock* last_map = first_map + map_count - 1;
3365       int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3366       if (next_offset == next_nonstatic_field_offset) {
3367         allocation_style = 0;   // allocate oops first
3368         next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3369         next_nonstatic_double_offset = next_nonstatic_oop_offset +
3370                                        (nonstatic_oop_count * heapOopSize);
3371       }
3372     }
3373     if( allocation_style == 2 ) {
3374       allocation_style = 1;     // allocate oops last
3375       next_nonstatic_double_offset = next_nonstatic_field_offset;
3376     }
3377   } else {
3378     ShouldNotReachHere();
3379   }
3380 
3381   int nonstatic_oop_space_count    = 0;
3382   int nonstatic_word_space_count   = 0;
3383   int nonstatic_short_space_count  = 0;
3384   int nonstatic_byte_space_count   = 0;
3385   int nonstatic_oop_space_offset   = 0;
3386   int nonstatic_word_space_offset  = 0;
3387   int nonstatic_short_space_offset = 0;
3388   int nonstatic_byte_space_offset  = 0;
3389 
3390   // Try to squeeze some of the fields into the gaps due to
3391   // long/double alignment.
3392   if( nonstatic_double_count > 0 ) {
3393     int offset = next_nonstatic_double_offset;
3394     next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3395     if( compact_fields && offset != next_nonstatic_double_offset ) {
3396       // Allocate available fields into the gap before double field.
3397       int length = next_nonstatic_double_offset - offset;
3398       assert(length == BytesPerInt, "");
3399       nonstatic_word_space_offset = offset;
3400       if( nonstatic_word_count > 0 ) {
3401         nonstatic_word_count      -= 1;
3402         nonstatic_word_space_count = 1; // Only one will fit
3403         length -= BytesPerInt;
3404         offset += BytesPerInt;
3405       }
3406       nonstatic_short_space_offset = offset;
3407       while( length >= BytesPerShort && nonstatic_short_count > 0 ) {
3408         nonstatic_short_count       -= 1;
3409         nonstatic_short_space_count += 1;
3410         length -= BytesPerShort;
3411         offset += BytesPerShort;
3412       }
3413       nonstatic_byte_space_offset = offset;
3414       while( length > 0 && nonstatic_byte_count > 0 ) {
3415         nonstatic_byte_count       -= 1;
3416         nonstatic_byte_space_count += 1;
3417         length -= 1;
3418       }
3419       // Allocate oop field in the gap if there are no other fields for that.
3420       nonstatic_oop_space_offset = offset;
3421       if( length >= heapOopSize && nonstatic_oop_count > 0 &&
3422           allocation_style != 0 ) { // when oop fields not first
3423         nonstatic_oop_count      -= 1;
3424         nonstatic_oop_space_count = 1; // Only one will fit
3425         length -= heapOopSize;
3426         offset += heapOopSize;
3427       }
3428     }
3429   }
3430 
3431   next_nonstatic_word_offset  = next_nonstatic_double_offset +
3432                                 (nonstatic_double_count * BytesPerLong);
3433   next_nonstatic_short_offset = next_nonstatic_word_offset +
3434                                 (nonstatic_word_count * BytesPerInt);
3435   next_nonstatic_byte_offset  = next_nonstatic_short_offset +
3436                                 (nonstatic_short_count * BytesPerShort);
3437   next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3438                                 nonstatic_byte_count;
3439 
3440   // let oops jump before padding with this allocation style
3441   if( allocation_style == 1 ) {
3442     next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3443     if( nonstatic_oop_count > 0 ) {
3444       next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3445     }
3446     next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3447   }
3448 
3449   // Iterate over fields again and compute correct offsets.
3450   // The field allocation type was temporarily stored in the offset slot.
3451   // oop fields are located before non-oop fields (static and non-static).
3452   for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) {
3453 
3454     // skip already laid out fields
3455     if (fs.is_offset_set()) continue;
3456 
3457     // contended instance fields are handled below
3458     if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3459 
3460     int real_offset = 0;
3461     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3462 
3463     // pack the rest of the fields
3464     switch (atype) {
3465       case STATIC_OOP:
3466         real_offset = next_static_oop_offset;
3467         next_static_oop_offset += heapOopSize;
3468         break;
3469       case STATIC_BYTE:
3470         real_offset = next_static_byte_offset;
3471         next_static_byte_offset += 1;
3472         break;
3473       case STATIC_SHORT:
3474         real_offset = next_static_short_offset;
3475         next_static_short_offset += BytesPerShort;
3476         break;
3477       case STATIC_WORD:
3478         real_offset = next_static_word_offset;
3479         next_static_word_offset += BytesPerInt;
3480         break;
3481       case STATIC_DOUBLE:
3482         real_offset = next_static_double_offset;
3483         next_static_double_offset += BytesPerLong;
3484         break;
3485       case NONSTATIC_OOP:
3486         if( nonstatic_oop_space_count > 0 ) {
3487           real_offset = nonstatic_oop_space_offset;
3488           nonstatic_oop_space_offset += heapOopSize;
3489           nonstatic_oop_space_count  -= 1;
3490         } else {
3491           real_offset = next_nonstatic_oop_offset;
3492           next_nonstatic_oop_offset += heapOopSize;
3493         }
3494 
3495         // Record this oop in the 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           // This oop is adjacent to the previous one, add to 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           // This oop is not adjacent to the previous one, 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 = 0;
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             // Record this oop in the oop maps
3628             if( nonstatic_oop_map_count > 0 &&
3629                 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3630                 real_offset -
3631                 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3632                 heapOopSize ) {
3633               // This oop is adjacent to the previous one, add to current oop map
3634               assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3635               nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3636             } else {
3637               // This oop is not adjacent to the previous one, create new oop map
3638               assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3639               nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3640               nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3641               nonstatic_oop_map_count += 1;
3642               if( first_nonstatic_oop_offset == 0 ) { // Undefined
3643                 first_nonstatic_oop_offset = real_offset;
3644               }
3645             }
3646             break;
3647 
3648           default:
3649             ShouldNotReachHere();
3650         }
3651 
3652         if (fs.contended_group() == 0) {
3653           // Contended group defines the equivalence class over the fields:
3654           // the fields within the same contended group are not inter-padded.
3655           // The only exception is default group, which does not incur the
3656           // equivalence, and so requires intra-padding.
3657           next_nonstatic_padded_offset += ContendedPaddingWidth;
3658         }
3659 
3660         fs.set_offset(real_offset);
3661       } // for
3662 
3663       // Start laying out the next group.
3664       // Note that this will effectively pad the last group in the back;
3665       // this is expected to alleviate memory contention effects for
3666       // subclass fields and/or adjacent object.
3667       // If this was the default group, the padding is already in place.
3668       if (current_group != 0) {
3669         next_nonstatic_padded_offset += ContendedPaddingWidth;
3670       }
3671     }
3672 
3673     // handle static fields
3674   }
3675 
3676   // Entire class is contended, pad in the back.
3677   // This helps to alleviate memory contention effects for subclass fields
3678   // and/or adjacent object.
3679   if (is_contended_class) {
3680     next_nonstatic_padded_offset += ContendedPaddingWidth;
3681   }
3682 
3683   int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
3684 
3685   int nonstatic_fields_end      = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
3686   int instance_end              = align_size_up(notaligned_nonstatic_fields_end, wordSize);
3687   int static_fields_end         = align_size_up(next_static_byte_offset, wordSize);
3688 
3689   int static_field_size         = (static_fields_end -
3690                                    InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
3691   nonstatic_field_size          = nonstatic_field_size +
3692                                   (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
3693 
3694   int instance_size             = align_object_size(instance_end / wordSize);
3695 
3696   assert(instance_size == align_object_size(align_size_up(
3697          (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
3698           wordSize) / wordSize), "consistent layout helper value");
3699 
3700   // Invariant: nonstatic_field end/start should only change if there are
3701   // nonstatic fields in the class, or if the class is contended. We compare
3702   // against the non-aligned value, so that end alignment will not fail the
3703   // assert without actually having the fields.
3704   assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
3705          is_contended_class ||
3706          (nonstatic_fields_count > 0), "double-check nonstatic start/end");
3707 
3708   // Number of non-static oop map blocks allocated at end of klass.
3709   const unsigned int total_oop_map_count =
3710     compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
3711                           first_nonstatic_oop_offset);
3712 
3713 #ifndef PRODUCT
3714   if (PrintFieldLayout) {
3715     print_field_layout(_class_name,
3716           _fields,
3717           _cp,
3718           instance_size,
3719           nonstatic_fields_start,
3720           nonstatic_fields_end,
3721           static_fields_end);
3722   }
3723 
3724 #endif
3725   // Pass back information needed for InstanceKlass creation
3726   info->nonstatic_oop_offsets = nonstatic_oop_offsets;
3727   info->nonstatic_oop_counts = nonstatic_oop_counts;
3728   info->nonstatic_oop_map_count = nonstatic_oop_map_count;
3729   info->total_oop_map_count = total_oop_map_count;
3730   info->instance_size = instance_size;
3731   info->static_field_size = static_field_size;
3732   info->nonstatic_field_size = nonstatic_field_size;
3733   info->has_nonstatic_fields = has_nonstatic_fields;
3734 }
3735 
3736 
3737 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
3738                                                     ClassLoaderData* loader_data,
3739                                                     Handle protection_domain,
3740                                                     KlassHandle host_klass,
3741                                                     GrowableArray<Handle>* cp_patches,
3742                                                     TempNewSymbol& parsed_name,
3743                                                     bool verify,
3744                                                     TRAPS) {
3745 
3746   // When a retransformable agent is attached, JVMTI caches the
3747   // class bytes that existed before the first retransformation.
3748   // If RedefineClasses() was used before the retransformable
3749   // agent attached, then the cached class bytes may not be the
3750   // original class bytes.
3751   JvmtiCachedClassFileData *cached_class_file = NULL;
3752   Handle class_loader(THREAD, loader_data->class_loader());
3753   bool has_default_methods = false;
3754   bool declares_default_methods = false;
3755   ResourceMark rm(THREAD);
3756 
3757   ClassFileStream* cfs = stream();
3758   // Timing
3759   assert(THREAD->is_Java_thread(), "must be a JavaThread");
3760   JavaThread* jt = (JavaThread*) THREAD;
3761 
3762   PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(),
3763                             ClassLoader::perf_class_parse_selftime(),
3764                             NULL,
3765                             jt->get_thread_stat()->perf_recursion_counts_addr(),
3766                             jt->get_thread_stat()->perf_timers_addr(),
3767                             PerfClassTraceTime::PARSE_CLASS);
3768 
3769   init_parsed_class_attributes(loader_data);
3770 
3771   if (JvmtiExport::should_post_class_file_load_hook()) {
3772     // Get the cached class file bytes (if any) from the class that
3773     // is being redefined or retransformed. We use jvmti_thread_state()
3774     // instead of JvmtiThreadState::state_for(jt) so we don't allocate
3775     // a JvmtiThreadState any earlier than necessary. This will help
3776     // avoid the bug described by 7126851.
3777     JvmtiThreadState *state = jt->jvmti_thread_state();
3778     if (state != NULL) {
3779       KlassHandle *h_class_being_redefined =
3780                      state->get_class_being_redefined();
3781       if (h_class_being_redefined != NULL) {
3782         instanceKlassHandle ikh_class_being_redefined =
3783           instanceKlassHandle(THREAD, (*h_class_being_redefined)());
3784         cached_class_file = ikh_class_being_redefined->get_cached_class_file();
3785       }
3786     }
3787 
3788     unsigned char* ptr = cfs->buffer();
3789     unsigned char* end_ptr = cfs->buffer() + cfs->length();
3790 
3791     JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain,
3792                                            &ptr, &end_ptr, &cached_class_file);
3793 
3794     if (ptr != cfs->buffer()) {
3795       // JVMTI agent has modified class file data.
3796       // Set new class file stream using JVMTI agent modified
3797       // class file data.
3798       cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source());
3799       set_stream(cfs);
3800     }
3801   }
3802 
3803   _host_klass = host_klass;
3804   _cp_patches = cp_patches;
3805 
3806   instanceKlassHandle nullHandle;
3807 
3808   // Figure out whether we can skip format checking (matching classic VM behavior)
3809   if (DumpSharedSpaces) {
3810     // verify == true means it's a 'remote' class (i.e., non-boot class)
3811     // Verification decision is based on BytecodeVerificationRemote flag
3812     // for those classes.
3813     _need_verify = (verify) ? BytecodeVerificationRemote :
3814                               BytecodeVerificationLocal;
3815   } else {
3816     _need_verify = Verifier::should_verify_for(class_loader(), verify);
3817   }
3818 
3819   // Set the verify flag in stream
3820   cfs->set_verify(_need_verify);
3821 
3822   // Save the class file name for easier error message printing.
3823   _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name();
3824 
3825   cfs->guarantee_more(8, CHECK_(nullHandle));  // magic, major, minor
3826   // Magic value
3827   u4 magic = cfs->get_u4_fast();
3828   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
3829                      "Incompatible magic value %u in class file %s",
3830                      magic, CHECK_(nullHandle));
3831 
3832   // Version numbers
3833   u2 minor_version = cfs->get_u2_fast();
3834   u2 major_version = cfs->get_u2_fast();
3835 
3836   if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) {
3837     ResourceMark rm;
3838     warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
3839             major_version,  minor_version, name->as_C_string());
3840     Exceptions::fthrow(
3841       THREAD_AND_LOCATION,
3842       vmSymbols::java_lang_UnsupportedClassVersionError(),
3843       "Unsupported major.minor version for dump time %u.%u",
3844       major_version,
3845       minor_version);
3846   }
3847 
3848   // Check version numbers - we check this even with verifier off
3849   if (!is_supported_version(major_version, minor_version)) {
3850     if (name == NULL) {
3851       Exceptions::fthrow(
3852         THREAD_AND_LOCATION,
3853         vmSymbols::java_lang_UnsupportedClassVersionError(),
3854         "Unsupported class file version %u.%u, "
3855         "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3856         major_version,
3857         minor_version,
3858         JAVA_MAX_SUPPORTED_VERSION,
3859         JAVA_MAX_SUPPORTED_MINOR_VERSION);
3860     } else {
3861       ResourceMark rm(THREAD);
3862       Exceptions::fthrow(
3863         THREAD_AND_LOCATION,
3864         vmSymbols::java_lang_UnsupportedClassVersionError(),
3865         "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
3866         "this version of the Java Runtime only recognizes class file versions up to %u.%u",
3867         name->as_C_string(),
3868         major_version,
3869         minor_version,
3870         JAVA_MAX_SUPPORTED_VERSION,
3871         JAVA_MAX_SUPPORTED_MINOR_VERSION);
3872     }
3873     return nullHandle;
3874   }
3875 
3876   _major_version = major_version;
3877   _minor_version = minor_version;
3878 
3879 
3880   // Check if verification needs to be relaxed for this class file
3881   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
3882   _relax_verify = Verifier::relax_verify_for(class_loader());
3883 
3884   // Constant pool
3885   constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle));
3886 
3887   int cp_size = cp->length();
3888 
3889   cfs->guarantee_more(8, CHECK_(nullHandle));  // flags, this_class, super_class, infs_len
3890 
3891   // Access flags
3892   AccessFlags access_flags;
3893   jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
3894 
3895   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3896     // Set abstract bit for old class files for backward compatibility
3897     flags |= JVM_ACC_ABSTRACT;
3898   }
3899   verify_legal_class_modifiers(flags, CHECK_(nullHandle));
3900   access_flags.set_flags(flags);
3901 
3902   // This class and superclass
3903   u2 this_class_index = cfs->get_u2_fast();
3904   check_property(
3905     valid_cp_range(this_class_index, cp_size) &&
3906       cp->tag_at(this_class_index).is_unresolved_klass(),
3907     "Invalid this class index %u in constant pool in class file %s",
3908     this_class_index, CHECK_(nullHandle));
3909 
3910   Symbol*  class_name  = cp->klass_name_at(this_class_index);
3911   assert(class_name != NULL, "class_name can't be null");
3912 
3913   // It's important to set parsed_name *before* resolving the super class.
3914   // (it's used for cleanup by the caller if parsing fails)
3915   parsed_name = class_name;
3916   // parsed_name is returned and can be used if there's an error, so add to
3917   // its reference count.  Caller will decrement the refcount.
3918   parsed_name->increment_refcount();
3919 
3920   // Update _class_name which could be null previously to be class_name
3921   _class_name = class_name;
3922 
3923   // Don't need to check whether this class name is legal or not.
3924   // It has been checked when constant pool is parsed.
3925   // However, make sure it is not an array type.
3926   if (_need_verify) {
3927     guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
3928                        "Bad class name in class file %s",
3929                        CHECK_(nullHandle));
3930   }
3931 
3932   Klass* preserve_this_klass;   // for storing result across HandleMark
3933 
3934   // release all handles when parsing is done
3935   { HandleMark hm(THREAD);
3936 
3937     // Checks if name in class file matches requested name
3938     if (name != NULL && class_name != name) {
3939       ResourceMark rm(THREAD);
3940       Exceptions::fthrow(
3941         THREAD_AND_LOCATION,
3942         vmSymbols::java_lang_NoClassDefFoundError(),
3943         "%s (wrong name: %s)",
3944         name->as_C_string(),
3945         class_name->as_C_string()
3946       );
3947       return nullHandle;
3948     }
3949 
3950     if (TraceClassLoadingPreorder) {
3951       tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName");
3952       if (cfs->source() != NULL) tty->print(" from %s", cfs->source());
3953       tty->print_cr("]");
3954     }
3955 #if INCLUDE_CDS
3956     if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) {
3957       // Only dump the classes that can be stored into CDS archive
3958       if (SystemDictionaryShared::is_sharing_possible(loader_data)) {
3959         if (name != NULL) {
3960           ResourceMark rm(THREAD);
3961           classlist_file->print_cr("%s", name->as_C_string());
3962           classlist_file->flush();
3963         }
3964       }
3965     }
3966 #endif
3967 
3968     u2 super_class_index = cfs->get_u2_fast();
3969     instanceKlassHandle super_klass = parse_super_class(super_class_index,
3970                                                         CHECK_NULL);
3971 
3972     // Interfaces
3973     u2 itfs_len = cfs->get_u2_fast();
3974     Array<Klass*>* local_interfaces =
3975       parse_interfaces(itfs_len, protection_domain, _class_name,
3976                        &has_default_methods, CHECK_(nullHandle));
3977 
3978     u2 java_fields_count = 0;
3979     // Fields (offsets are filled in later)
3980     FieldAllocationCount fac;
3981     Array<u2>* fields = parse_fields(class_name,
3982                                      access_flags.is_interface(),
3983                                      &fac, &java_fields_count,
3984                                      CHECK_(nullHandle));
3985     // Methods
3986     bool has_final_method = false;
3987     AccessFlags promoted_flags;
3988     promoted_flags.set_flags(0);
3989     Array<Method*>* methods = parse_methods(access_flags.is_interface(),
3990                                             &promoted_flags,
3991                                             &has_final_method,
3992                                             &declares_default_methods,
3993                                             CHECK_(nullHandle));
3994 
3995     if (declares_default_methods) {
3996       has_default_methods = true;
3997     }
3998 
3999     // Additional attributes
4000     ClassAnnotationCollector parsed_annotations;
4001     parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle));
4002 
4003     // Finalize the Annotations metadata object,
4004     // now that all annotation arrays have been created.
4005     create_combined_annotations(CHECK_(nullHandle));
4006 
4007     // Make sure this is the end of class file stream
4008     guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle));
4009 
4010     // We check super class after class file is parsed and format is checked
4011     if (super_class_index > 0 && super_klass.is_null()) {
4012       Symbol*  sk  = cp->klass_name_at(super_class_index);
4013       if (access_flags.is_interface()) {
4014         // Before attempting to resolve the superclass, check for class format
4015         // errors not checked yet.
4016         guarantee_property(sk == vmSymbols::java_lang_Object(),
4017                            "Interfaces must have java.lang.Object as superclass in class file %s",
4018                            CHECK_(nullHandle));
4019       }
4020       Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk,
4021                                                          class_loader,
4022                                                          protection_domain,
4023                                                          true,
4024                                                          CHECK_(nullHandle));
4025 
4026       KlassHandle kh (THREAD, k);
4027       super_klass = instanceKlassHandle(THREAD, kh());
4028     }
4029     if (super_klass.not_null()) {
4030 
4031       if (super_klass->has_default_methods()) {
4032         has_default_methods = true;
4033       }
4034 
4035       if (super_klass->is_interface()) {
4036         ResourceMark rm(THREAD);
4037         Exceptions::fthrow(
4038           THREAD_AND_LOCATION,
4039           vmSymbols::java_lang_IncompatibleClassChangeError(),
4040           "class %s has interface %s as super class",
4041           class_name->as_klass_external_name(),
4042           super_klass->external_name()
4043         );
4044         return nullHandle;
4045       }
4046       // Make sure super class is not final
4047       if (super_klass->is_final()) {
4048         THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle);
4049       }
4050     }
4051 
4052     // save super klass for error handling.
4053     _super_klass = super_klass;
4054 
4055     // Compute the transitive list of all unique interfaces implemented by this class
4056     _transitive_interfaces =
4057           compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle));
4058 
4059     // sort methods
4060     intArray* method_ordering = sort_methods(methods);
4061 
4062     // promote flags from parse_methods() to the klass' flags
4063     access_flags.add_promoted_flags(promoted_flags.as_int());
4064 
4065     // Size of Java vtable (in words)
4066     int vtable_size = 0;
4067     int itable_size = 0;
4068     int num_miranda_methods = 0;
4069 
4070     GrowableArray<Method*> all_mirandas(20);
4071 
4072     klassVtable::compute_vtable_size_and_num_mirandas(
4073         &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods,
4074         access_flags, class_loader, class_name, local_interfaces,
4075                                                       CHECK_(nullHandle));
4076 
4077     // Size of Java itable (in words)
4078     itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces);
4079 
4080     FieldLayoutInfo info;
4081     layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL);
4082 
4083     int total_oop_map_size2 =
4084           InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count);
4085 
4086     // Compute reference type
4087     ReferenceType rt;
4088     if (super_klass() == NULL) {
4089       rt = REF_NONE;
4090     } else {
4091       rt = super_klass->reference_type();
4092     }
4093 
4094     // We can now create the basic Klass* for this klass
4095     _klass = InstanceKlass::allocate_instance_klass(loader_data,
4096                                                     vtable_size,
4097                                                     itable_size,
4098                                                     info.static_field_size,
4099                                                     total_oop_map_size2,
4100                                                     rt,
4101                                                     access_flags,
4102                                                     name,
4103                                                     super_klass(),
4104                                                     !host_klass.is_null(),
4105                                                     CHECK_(nullHandle));
4106     instanceKlassHandle this_klass (THREAD, _klass);
4107 
4108     assert(this_klass->static_field_size() == info.static_field_size, "sanity");
4109     assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count,
4110            "sanity");
4111 
4112     // Fill in information already parsed
4113     this_klass->set_should_verify_class(verify);
4114     jint lh = Klass::instance_layout_helper(info.instance_size, false);
4115     this_klass->set_layout_helper(lh);
4116     assert(this_klass->is_instance_klass(), "layout is correct");
4117     assert(this_klass->size_helper() == info.instance_size, "correct size_helper");
4118     // Not yet: supers are done below to support the new subtype-checking fields
4119     //this_klass->set_super(super_klass());
4120     this_klass->set_class_loader_data(loader_data);
4121     this_klass->set_nonstatic_field_size(info.nonstatic_field_size);
4122     this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields);
4123     this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]);
4124 
4125     apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL);
4126 
4127     if (has_final_method) {
4128       this_klass->set_has_final_method();
4129     }
4130     this_klass->copy_method_ordering(method_ordering, CHECK_NULL);
4131     // The InstanceKlass::_methods_jmethod_ids cache
4132     // is managed on the assumption that the initial cache
4133     // size is equal to the number of methods in the class. If
4134     // that changes, then InstanceKlass::idnum_can_increment()
4135     // has to be changed accordingly.
4136     this_klass->set_initial_method_idnum(methods->length());
4137     this_klass->set_name(cp->klass_name_at(this_class_index));
4138     if (is_anonymous())  // I am well known to myself
4139       cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
4140 
4141     this_klass->set_minor_version(minor_version);
4142     this_klass->set_major_version(major_version);
4143     this_klass->set_has_default_methods(has_default_methods);
4144     this_klass->set_declares_default_methods(declares_default_methods);
4145 
4146     if (!host_klass.is_null()) {
4147       assert (this_klass->is_anonymous(), "should be the same");
4148       this_klass->set_host_klass(host_klass());
4149     }
4150 
4151     // Set up Method*::intrinsic_id as soon as we know the names of methods.
4152     // (We used to do this lazily, but now we query it in Rewriter,
4153     // which is eagerly done for every method, so we might as well do it now,
4154     // when everything is fresh in memory.)
4155     vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass());
4156     if (klass_id != vmSymbols::NO_SID) {
4157       for (int j = 0; j < methods->length(); j++) {
4158         Method* method = methods->at(j);
4159         method->init_intrinsic_id();
4160 
4161         if (CheckIntrinsics) {
4162           // Check if an intrinsic is defined for method 'method',
4163           // but the method is not annotated with @HotSpotIntrinsicCandidate.
4164           if (method->intrinsic_id() != vmIntrinsics::_none &&
4165               !method->intrinsic_candidate()) {
4166             tty->print("Compiler intrinsic is defined for method [%s], "
4167                        "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
4168                        method->name_and_sig_as_C_string(),
4169                        NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
4170                        );
4171             tty->cr();
4172             DEBUG_ONLY(vm_exit(1));
4173           }
4174           // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
4175           // but there is no intrinsic available for it.
4176           if (method->intrinsic_candidate() &&
4177               method->intrinsic_id() == vmIntrinsics::_none) {
4178             tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
4179                        "but no compiler intrinsic is defined for the method.%s",
4180                        method->name_and_sig_as_C_string(),
4181                        NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4182                        );
4183             tty->cr();
4184             DEBUG_ONLY(vm_exit(1));
4185           }
4186         }
4187       }
4188 
4189 #ifdef ASSERT
4190       if (CheckIntrinsics) {
4191         // Check for orphan methods in the current class. A method m
4192         // of a class C is orphan if an intrinsic is defined for method m,
4193         // but class C does not declare m.
4194         // The check is potentially expensive, therefore it is available
4195         // only in debug builds.
4196 
4197         for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) {
4198           if (id == vmIntrinsics::_compiledLambdaForm) {
4199             // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
4200             // generated for the JVM from a LambdaForm and therefore no method
4201             // is defined for it.
4202             continue;
4203           }
4204 
4205           if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
4206             // Check if the current class contains a method with the same
4207             // name, flags, signature.
4208             bool match = false;
4209             for (int j = 0; j < methods->length(); j++) {
4210               Method* method = methods->at(j);
4211               if (id == method->intrinsic_id()) {
4212                 match = true;
4213                 break;
4214               }
4215             }
4216 
4217             if (!match) {
4218               char buf[1000];
4219               tty->print("Compiler intrinsic is defined for method [%s], "
4220                          "but the method is not available in class [%s].%s",
4221                          vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)),
4222                          this_klass->name()->as_C_string(),
4223                          NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
4224                          );
4225               tty->cr();
4226               DEBUG_ONLY(vm_exit(1));
4227             }
4228           }
4229         }
4230       }
4231 #endif // ASSERT
4232     }
4233 
4234 
4235     if (cached_class_file != NULL) {
4236       // JVMTI: we have an InstanceKlass now, tell it about the cached bytes
4237       this_klass->set_cached_class_file(cached_class_file);
4238     }
4239 
4240     // Fill in field values obtained by parse_classfile_attributes
4241     if (parsed_annotations.has_any_annotations())
4242       parsed_annotations.apply_to(this_klass);
4243     apply_parsed_class_attributes(this_klass);
4244 
4245     // Miranda methods
4246     if ((num_miranda_methods > 0) ||
4247         // if this class introduced new miranda methods or
4248         (super_klass.not_null() && (super_klass->has_miranda_methods()))
4249         // super class exists and this class inherited miranda methods
4250         ) {
4251       this_klass->set_has_miranda_methods(); // then set a flag
4252     }
4253 
4254     // Fill in information needed to compute superclasses.
4255     this_klass->initialize_supers(super_klass(), CHECK_(nullHandle));
4256 
4257     // Initialize itable offset tables
4258     klassItable::setup_itable_offset_table(this_klass);
4259 
4260     // Compute transitive closure of interfaces this class implements
4261     // Do final class setup
4262     fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts);
4263 
4264     // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
4265     set_precomputed_flags(this_klass);
4266 
4267     // reinitialize modifiers, using the InnerClasses attribute
4268     int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle));
4269     this_klass->set_modifier_flags(computed_modifiers);
4270 
4271     // check if this class can access its super class
4272     check_super_class_access(this_klass, CHECK_(nullHandle));
4273 
4274     // check if this class can access its superinterfaces
4275     check_super_interface_access(this_klass, CHECK_(nullHandle));
4276 
4277     // check if this class overrides any final method
4278     check_final_method_override(this_klass, CHECK_(nullHandle));
4279 
4280     // check that if this class is an interface then it doesn't have static methods
4281     if (this_klass->is_interface()) {
4282       /* An interface in a JAVA 8 classfile can be static */
4283       if (_major_version < JAVA_8_VERSION) {
4284         check_illegal_static_method(this_klass, CHECK_(nullHandle));
4285       }
4286     }
4287 
4288     // Allocate mirror and initialize static fields
4289     java_lang_Class::create_mirror(this_klass, class_loader, protection_domain,
4290                                    CHECK_(nullHandle));
4291 
4292     // Generate any default methods - default methods are interface methods
4293     // that have a default implementation.  This is new with Lambda project.
4294     if (has_default_methods ) {
4295       DefaultMethods::generate_default_methods(
4296           this_klass(), &all_mirandas, CHECK_(nullHandle));
4297     }
4298 
4299     // Update the loader_data graph.
4300     record_defined_class_dependencies(this_klass, CHECK_NULL);
4301 
4302     ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()),
4303                                              false /* not shared class */);
4304 
4305     if (TraceClassLoading) {
4306       ResourceMark rm;
4307       // print in a single call to reduce interleaving of output
4308       if (cfs->source() != NULL) {
4309         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4310                    cfs->source());
4311       } else if (class_loader.is_null()) {
4312         Klass* caller =
4313             THREAD->is_Java_thread()
4314                 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
4315                 : NULL;
4316         // caller can be NULL, for example, during a JVMTI VM_Init hook
4317         if (caller != NULL) {
4318           tty->print("[Loaded %s by instance of %s]\n",
4319                      this_klass->external_name(),
4320                      caller->external_name());
4321         } else {
4322           tty->print("[Loaded %s]\n", this_klass->external_name());
4323         }
4324       } else {
4325         tty->print("[Loaded %s from %s]\n", this_klass->external_name(),
4326                    class_loader->klass()->external_name());
4327       }
4328     }
4329 
4330     if (TraceClassResolution) {
4331       ResourceMark rm;
4332       // print out the superclass.
4333       const char * from = this_klass()->external_name();
4334       if (this_klass->java_super() != NULL) {
4335         tty->print("RESOLVE %s %s (super)\n", from, this_klass->java_super()->external_name());
4336       }
4337       // print out each of the interface classes referred to by this class.
4338       Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4339       if (local_interfaces != NULL) {
4340         int length = local_interfaces->length();
4341         for (int i = 0; i < length; i++) {
4342           Klass* k = local_interfaces->at(i);
4343           const char * to = k->external_name();
4344           tty->print("RESOLVE %s %s (interface)\n", from, to);
4345         }
4346       }
4347     }
4348 
4349     // preserve result across HandleMark
4350     preserve_this_klass = this_klass();
4351   }
4352 
4353   // Create new handle outside HandleMark (might be needed for
4354   // Extended Class Redefinition)
4355   instanceKlassHandle this_klass (THREAD, preserve_this_klass);
4356   debug_only(this_klass->verify();)
4357 
4358   // Clear class if no error has occurred so destructor doesn't deallocate it
4359   _klass = NULL;
4360   return this_klass;
4361 }
4362 
4363 // Destructor to clean up if there's an error
4364 ClassFileParser::~ClassFileParser() {
4365   MetadataFactory::free_metadata(_loader_data, _cp);
4366   MetadataFactory::free_array<u2>(_loader_data, _fields);
4367 
4368   // Free methods
4369   InstanceKlass::deallocate_methods(_loader_data, _methods);
4370 
4371   // beware of the Universe::empty_blah_array!!
4372   if (_inner_classes != Universe::the_empty_short_array()) {
4373     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
4374   }
4375 
4376   // Free interfaces
4377   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(),
4378                                        _local_interfaces, _transitive_interfaces);
4379 
4380   if (_combined_annotations != NULL) {
4381     // After all annotations arrays have been created, they are installed into the
4382     // Annotations object that will be assigned to the InstanceKlass being created.
4383 
4384     // Deallocate the Annotations object and the installed annotations arrays.
4385     _combined_annotations->deallocate_contents(_loader_data);
4386 
4387     // If the _combined_annotations pointer is non-NULL,
4388     // then the other annotations fields should have been cleared.
4389     assert(_annotations             == NULL, "Should have been cleared");
4390     assert(_type_annotations        == NULL, "Should have been cleared");
4391     assert(_fields_annotations      == NULL, "Should have been cleared");
4392     assert(_fields_type_annotations == NULL, "Should have been cleared");
4393   } else {
4394     // If the annotations arrays were not installed into the Annotations object,
4395     // then they have to be deallocated explicitly.
4396     MetadataFactory::free_array<u1>(_loader_data, _annotations);
4397     MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
4398     Annotations::free_contents(_loader_data, _fields_annotations);
4399     Annotations::free_contents(_loader_data, _fields_type_annotations);
4400   }
4401 
4402   clear_class_metadata();
4403 
4404   // deallocate the klass if already created.  Don't directly deallocate, but add
4405   // to the deallocate list so that the klass is removed from the CLD::_klasses list
4406   // at a safepoint.
4407   if (_klass != NULL) {
4408     _loader_data->add_to_deallocate_list(_klass);
4409   }
4410   _klass = NULL;
4411 }
4412 
4413 void ClassFileParser::print_field_layout(Symbol* name,
4414                                          Array<u2>* fields,
4415                                          const constantPoolHandle& cp,
4416                                          int instance_size,
4417                                          int instance_fields_start,
4418                                          int instance_fields_end,
4419                                          int static_fields_end) {
4420   tty->print("%s: field layout\n", name->as_klass_external_name());
4421   tty->print("  @%3d %s\n", instance_fields_start, "--- instance fields start ---");
4422   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4423     if (!fs.access_flags().is_static()) {
4424       tty->print("  @%3d \"%s\" %s\n",
4425           fs.offset(),
4426           fs.name()->as_klass_external_name(),
4427           fs.signature()->as_klass_external_name());
4428     }
4429   }
4430   tty->print("  @%3d %s\n", instance_fields_end, "--- instance fields end ---");
4431   tty->print("  @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
4432   tty->print("  @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
4433   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
4434     if (fs.access_flags().is_static()) {
4435       tty->print("  @%3d \"%s\" %s\n",
4436           fs.offset(),
4437           fs.name()->as_klass_external_name(),
4438           fs.signature()->as_klass_external_name());
4439     }
4440   }
4441   tty->print("  @%3d %s\n", static_fields_end, "--- static fields end ---");
4442   tty->print("\n");
4443 }
4444 
4445 unsigned int
4446 ClassFileParser::compute_oop_map_count(instanceKlassHandle super,
4447                                        unsigned int nonstatic_oop_map_count,
4448                                        int first_nonstatic_oop_offset) {
4449   unsigned int map_count =
4450     super.is_null() ? 0 : super->nonstatic_oop_map_count();
4451   if (nonstatic_oop_map_count > 0) {
4452     // We have oops to add to map
4453     if (map_count == 0) {
4454       map_count = nonstatic_oop_map_count;
4455     } else {
4456       // Check whether we should add a new map block or whether the last one can
4457       // be extended
4458       OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
4459       OopMapBlock* const last_map = first_map + map_count - 1;
4460 
4461       int next_offset = last_map->offset() + last_map->count() * heapOopSize;
4462       if (next_offset == first_nonstatic_oop_offset) {
4463         // There is no gap bettwen superklass's last oop field and first
4464         // local oop field, merge maps.
4465         nonstatic_oop_map_count -= 1;
4466       } else {
4467         // Superklass didn't end with a oop field, add extra maps
4468         assert(next_offset < first_nonstatic_oop_offset, "just checking");
4469       }
4470       map_count += nonstatic_oop_map_count;
4471     }
4472   }
4473   return map_count;
4474 }
4475 
4476 
4477 void ClassFileParser::fill_oop_maps(instanceKlassHandle k,
4478                                     unsigned int nonstatic_oop_map_count,
4479                                     int* nonstatic_oop_offsets,
4480                                     unsigned int* nonstatic_oop_counts) {
4481   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4482   const InstanceKlass* const super = k->superklass();
4483   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4484   if (super_count > 0) {
4485     // Copy maps from superklass
4486     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4487     for (unsigned int i = 0; i < super_count; ++i) {
4488       *this_oop_map++ = *super_oop_map++;
4489     }
4490   }
4491 
4492   if (nonstatic_oop_map_count > 0) {
4493     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4494       // The counts differ because there is no gap between superklass's last oop
4495       // field and the first local oop field.  Extend the last oop map copied
4496       // from the superklass instead of creating new one.
4497       nonstatic_oop_map_count--;
4498       nonstatic_oop_offsets++;
4499       this_oop_map--;
4500       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4501       this_oop_map++;
4502     }
4503 
4504     // Add new map blocks, fill them
4505     while (nonstatic_oop_map_count-- > 0) {
4506       this_oop_map->set_offset(*nonstatic_oop_offsets++);
4507       this_oop_map->set_count(*nonstatic_oop_counts++);
4508       this_oop_map++;
4509     }
4510     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4511            this_oop_map, "sanity");
4512   }
4513 }
4514 
4515 
4516 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) {
4517   Klass* super = k->super();
4518 
4519   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4520   // in which case we don't have to register objects as finalizable
4521   if (!_has_empty_finalizer) {
4522     if (_has_finalizer ||
4523         (super != NULL && super->has_finalizer())) {
4524       k->set_has_finalizer();
4525     }
4526   }
4527 
4528 #ifdef ASSERT
4529   bool f = false;
4530   Method* m = k->lookup_method(vmSymbols::finalize_method_name(),
4531                                  vmSymbols::void_method_signature());
4532   if (m != NULL && !m->is_empty_method()) {
4533       f = true;
4534   }
4535 
4536   // Spec doesn't prevent agent from redefinition of empty finalizer.
4537   // Despite the fact that it's generally bad idea and redefined finalizer
4538   // will not work as expected we shouldn't abort vm in this case
4539   if (!k->has_redefined_this_or_super()) {
4540     assert(f == k->has_finalizer(), "inconsistent has_finalizer");
4541   }
4542 #endif
4543 
4544   // Check if this klass supports the java.lang.Cloneable interface
4545   if (SystemDictionary::Cloneable_klass_loaded()) {
4546     if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4547       k->set_is_cloneable();
4548     }
4549   }
4550 
4551   // Check if this klass has a vanilla default constructor
4552   if (super == NULL) {
4553     // java.lang.Object has empty default constructor
4554     k->set_has_vanilla_constructor();
4555   } else {
4556     if (super->has_vanilla_constructor() &&
4557         _has_vanilla_constructor) {
4558       k->set_has_vanilla_constructor();
4559     }
4560 #ifdef ASSERT
4561     bool v = false;
4562     if (super->has_vanilla_constructor()) {
4563       Method* constructor = k->find_method(vmSymbols::object_initializer_name(
4564 ), vmSymbols::void_method_signature());
4565       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4566         v = true;
4567       }
4568     }
4569     assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4570 #endif
4571   }
4572 
4573   // If it cannot be fast-path allocated, set a bit in the layout helper.
4574   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4575   assert(k->size_helper() > 0, "layout_helper is initialized");
4576   if ((!RegisterFinalizersAtInit && k->has_finalizer())
4577       || k->is_abstract() || k->is_interface()
4578       || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL)
4579       || k->size_helper() >= FastAllocateSizeLimit) {
4580     // Forbid fast-path allocation.
4581     jint lh = Klass::instance_layout_helper(k->size_helper(), true);
4582     k->set_layout_helper(lh);
4583   }
4584 }
4585 
4586 // Attach super classes and interface classes to class loader data
4587 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) {
4588   ClassLoaderData * defining_loader_data = defined_klass->class_loader_data();
4589   if (defining_loader_data->is_the_null_class_loader_data()) {
4590       // Dependencies to null class loader data are implicit.
4591       return;
4592   } else {
4593     // add super class dependency
4594     Klass* super = defined_klass->super();
4595     if (super != NULL) {
4596       defining_loader_data->record_dependency(super, CHECK);
4597     }
4598 
4599     // add super interface dependencies
4600     Array<Klass*>* local_interfaces = defined_klass->local_interfaces();
4601     if (local_interfaces != NULL) {
4602       int length = local_interfaces->length();
4603       for (int i = 0; i < length; i++) {
4604         defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4605       }
4606     }
4607   }
4608 }
4609 
4610 // utility methods for appending an array with check for duplicates
4611 
4612 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) {
4613   // iterate over new interfaces
4614   for (int i = 0; i < ifs->length(); i++) {
4615     Klass* e = ifs->at(i);
4616     assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4617     // add new interface
4618     result->append_if_missing(e);
4619   }
4620 }
4621 
4622 Array<Klass*>* ClassFileParser::compute_transitive_interfaces(
4623                                         instanceKlassHandle super,
4624                                         Array<Klass*>* local_ifs, TRAPS) {
4625   // Compute maximum size for transitive interfaces
4626   int max_transitive_size = 0;
4627   int super_size = 0;
4628   // Add superclass transitive interfaces size
4629   if (super.not_null()) {
4630     super_size = super->transitive_interfaces()->length();
4631     max_transitive_size += super_size;
4632   }
4633   // Add local interfaces' super interfaces
4634   int local_size = local_ifs->length();
4635   for (int i = 0; i < local_size; i++) {
4636     Klass* l = local_ifs->at(i);
4637     max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4638   }
4639   // Finally add local interfaces
4640   max_transitive_size += local_size;
4641   // Construct array
4642   if (max_transitive_size == 0) {
4643     // no interfaces, use canonicalized array
4644     return Universe::the_empty_klass_array();
4645   } else if (max_transitive_size == super_size) {
4646     // no new local interfaces added, share superklass' transitive interface array
4647     return super->transitive_interfaces();
4648   } else if (max_transitive_size == local_size) {
4649     // only local interfaces added, share local interface array
4650     return local_ifs;
4651   } else {
4652     ResourceMark rm;
4653     GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size);
4654 
4655     // Copy down from superclass
4656     if (super.not_null()) {
4657       append_interfaces(result, super->transitive_interfaces());
4658     }
4659 
4660     // Copy down from local interfaces' superinterfaces
4661     for (int i = 0; i < local_ifs->length(); i++) {
4662       Klass* l = local_ifs->at(i);
4663       append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4664     }
4665     // Finally add local interfaces
4666     append_interfaces(result, local_ifs);
4667 
4668     // length will be less than the max_transitive_size if duplicates were removed
4669     int length = result->length();
4670     assert(length <= max_transitive_size, "just checking");
4671     Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL);
4672     for (int i = 0; i < length; i++) {
4673       Klass* e = result->at(i);
4674         assert(e != NULL, "just checking");
4675       new_result->at_put(i, e);
4676     }
4677     return new_result;
4678   }
4679 }
4680 
4681 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) {
4682   Klass* super = this_klass->super();
4683   if ((super != NULL) &&
4684       (!Reflection::verify_class_access(this_klass(), super, false))) {
4685     ResourceMark rm(THREAD);
4686     Exceptions::fthrow(
4687       THREAD_AND_LOCATION,
4688       vmSymbols::java_lang_IllegalAccessError(),
4689       "class %s cannot access its superclass %s",
4690       this_klass->external_name(),
4691       super->external_name()
4692     );
4693     return;
4694   }
4695 }
4696 
4697 
4698 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) {
4699   Array<Klass*>* local_interfaces = this_klass->local_interfaces();
4700   int lng = local_interfaces->length();
4701   for (int i = lng - 1; i >= 0; i--) {
4702     Klass* k = local_interfaces->at(i);
4703     assert (k != NULL && k->is_interface(), "invalid interface");
4704     if (!Reflection::verify_class_access(this_klass(), k, false)) {
4705       ResourceMark rm(THREAD);
4706       Exceptions::fthrow(
4707         THREAD_AND_LOCATION,
4708         vmSymbols::java_lang_IllegalAccessError(),
4709         "class %s cannot access its superinterface %s",
4710         this_klass->external_name(),
4711         k->external_name()
4712       );
4713       return;
4714     }
4715   }
4716 }
4717 
4718 
4719 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) {
4720   Array<Method*>* methods = this_klass->methods();
4721   int num_methods = methods->length();
4722 
4723   // go thru each method and check if it overrides a final method
4724   for (int index = 0; index < num_methods; index++) {
4725     Method* m = methods->at(index);
4726 
4727     // skip private, static, and <init> methods
4728     if ((!m->is_private() && !m->is_static()) &&
4729         (m->name() != vmSymbols::object_initializer_name())) {
4730 
4731       Symbol* name = m->name();
4732       Symbol* signature = m->signature();
4733       Klass* k = this_klass->super();
4734       Method* super_m = NULL;
4735       while (k != NULL) {
4736         // skip supers that don't have final methods.
4737         if (k->has_final_method()) {
4738           // lookup a matching method in the super class hierarchy
4739           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4740           if (super_m == NULL) {
4741             break; // didn't find any match; get out
4742           }
4743 
4744           if (super_m->is_final() && !super_m->is_static() &&
4745               // matching method in super is final, and not static
4746               (Reflection::verify_field_access(this_klass(),
4747                                                super_m->method_holder(),
4748                                                super_m->method_holder(),
4749                                                super_m->access_flags(), false))
4750             // this class can access super final method and therefore override
4751             ) {
4752             ResourceMark rm(THREAD);
4753             Exceptions::fthrow(
4754               THREAD_AND_LOCATION,
4755               vmSymbols::java_lang_VerifyError(),
4756               "class %s overrides final method %s.%s%s",
4757               this_klass->external_name(),
4758               super_m->method_holder()->external_name(),
4759               name->as_C_string(),
4760               signature->as_C_string()
4761             );
4762             return;
4763           }
4764 
4765           // continue to look from super_m's holder's super.
4766           k = super_m->method_holder()->super();
4767           continue;
4768         }
4769 
4770         k = k->super();
4771       }
4772     }
4773   }
4774 }
4775 
4776 
4777 // assumes that this_klass is an interface
4778 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) {
4779   assert(this_klass->is_interface(), "not an interface");
4780   Array<Method*>* methods = this_klass->methods();
4781   int num_methods = methods->length();
4782 
4783   for (int index = 0; index < num_methods; index++) {
4784     Method* m = methods->at(index);
4785     // if m is static and not the init method, throw a verify error
4786     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4787       ResourceMark rm(THREAD);
4788       Exceptions::fthrow(
4789         THREAD_AND_LOCATION,
4790         vmSymbols::java_lang_VerifyError(),
4791         "Illegal static method %s in interface %s",
4792         m->name()->as_C_string(),
4793         this_klass->external_name()
4794       );
4795       return;
4796     }
4797   }
4798 }
4799 
4800 // utility methods for format checking
4801 
4802 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) {
4803   if (!_need_verify) { return; }
4804 
4805   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4806   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4807   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4808   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4809   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4810   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4811   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
4812 
4813   if ((is_abstract && is_final) ||
4814       (is_interface && !is_abstract) ||
4815       (is_interface && major_gte_15 && (is_super || is_enum)) ||
4816       (!is_interface && major_gte_15 && is_annotation)) {
4817     ResourceMark rm(THREAD);
4818     Exceptions::fthrow(
4819       THREAD_AND_LOCATION,
4820       vmSymbols::java_lang_ClassFormatError(),
4821       "Illegal class modifiers in class %s: 0x%X",
4822       _class_name->as_C_string(), flags
4823     );
4824     return;
4825   }
4826 }
4827 
4828 bool ClassFileParser::has_illegal_visibility(jint flags) {
4829   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4830   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4831   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4832 
4833   return ((is_public && is_protected) ||
4834           (is_public && is_private) ||
4835           (is_protected && is_private));
4836 }
4837 
4838 bool ClassFileParser::is_supported_version(u2 major, u2 minor) {
4839   u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4840   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4841          (major <= max_version) &&
4842          ((major != max_version) ||
4843           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4844 }
4845 
4846 void ClassFileParser::verify_legal_field_modifiers(
4847     jint flags, bool is_interface, TRAPS) {
4848   if (!_need_verify) { return; }
4849 
4850   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4851   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4852   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4853   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4854   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4855   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4856   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4857   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4858   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4859 
4860   bool is_illegal = false;
4861 
4862   if (is_interface) {
4863     if (!is_public || !is_static || !is_final || is_private ||
4864         is_protected || is_volatile || is_transient ||
4865         (major_gte_15 && is_enum)) {
4866       is_illegal = true;
4867     }
4868   } else { // not interface
4869     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4870       is_illegal = true;
4871     }
4872   }
4873 
4874   if (is_illegal) {
4875     ResourceMark rm(THREAD);
4876     Exceptions::fthrow(
4877       THREAD_AND_LOCATION,
4878       vmSymbols::java_lang_ClassFormatError(),
4879       "Illegal field modifiers in class %s: 0x%X",
4880       _class_name->as_C_string(), flags);
4881     return;
4882   }
4883 }
4884 
4885 void ClassFileParser::verify_legal_method_modifiers(
4886     jint flags, bool is_interface, Symbol* name, TRAPS) {
4887   if (!_need_verify) { return; }
4888 
4889   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4890   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4891   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4892   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4893   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4894   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4895   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4896   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4897   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4898   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4899   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
4900   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4901   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4902 
4903   bool is_illegal = false;
4904 
4905   if (is_interface) {
4906     if (major_gte_8) {
4907       // Class file version is JAVA_8_VERSION or later Methods of
4908       // interfaces may set any of the flags except ACC_PROTECTED,
4909       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4910       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4911       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4912           (is_native || is_protected || is_final || is_synchronized) ||
4913           // If a specific method of a class or interface has its
4914           // ACC_ABSTRACT flag set, it must not have any of its
4915           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4916           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4917           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4918           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4919           (is_abstract && (is_private || is_static || is_strict))) {
4920         is_illegal = true;
4921       }
4922     } else if (major_gte_15) {
4923       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4924       if (!is_public || is_static || is_final || is_synchronized ||
4925           is_native || !is_abstract || is_strict) {
4926         is_illegal = true;
4927       }
4928     } else {
4929       // Class file version is pre-JAVA_1_5_VERSION
4930       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4931         is_illegal = true;
4932       }
4933     }
4934   } else { // not interface
4935     if (has_illegal_visibility(flags)) {
4936       is_illegal = true;
4937     } else {
4938       if (is_initializer) {
4939         if (is_static || is_final || is_synchronized || is_native ||
4940             is_abstract || (major_gte_15 && is_bridge)) {
4941           is_illegal = true;
4942         }
4943       } else { // not initializer
4944         if (is_abstract) {
4945           if ((is_final || is_native || is_private || is_static ||
4946               (major_gte_15 && (is_synchronized || is_strict)))) {
4947             is_illegal = true;
4948           }
4949         }
4950       }
4951     }
4952   }
4953 
4954   if (is_illegal) {
4955     ResourceMark rm(THREAD);
4956     Exceptions::fthrow(
4957       THREAD_AND_LOCATION,
4958       vmSymbols::java_lang_ClassFormatError(),
4959       "Method %s in class %s has illegal modifiers: 0x%X",
4960       name->as_C_string(), _class_name->as_C_string(), flags);
4961     return;
4962   }
4963 }
4964 
4965 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) {
4966   assert(_need_verify, "only called when _need_verify is true");
4967   int i = 0;
4968   int count = length >> 2;
4969   for (int k=0; k<count; k++) {
4970     unsigned char b0 = buffer[i];
4971     unsigned char b1 = buffer[i+1];
4972     unsigned char b2 = buffer[i+2];
4973     unsigned char b3 = buffer[i+3];
4974     // For an unsigned char v,
4975     // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4976     // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4977     unsigned char res = b0 | b0 - 1 |
4978                         b1 | b1 - 1 |
4979                         b2 | b2 - 1 |
4980                         b3 | b3 - 1;
4981     if (res >= 128) break;
4982     i += 4;
4983   }
4984   for(; i < length; i++) {
4985     unsigned short c;
4986     // no embedded zeros
4987     guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4988     if(buffer[i] < 128) {
4989       continue;
4990     }
4991     if ((i + 5) < length) { // see if it's legal supplementary character
4992       if (UTF8::is_supplementary_character(&buffer[i])) {
4993         c = UTF8::get_supplementary_character(&buffer[i]);
4994         i += 5;
4995         continue;
4996       }
4997     }
4998     switch (buffer[i] >> 4) {
4999       default: break;
5000       case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
5001         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5002       case 0xC: case 0xD:  // 110xxxxx  10xxxxxx
5003         c = (buffer[i] & 0x1F) << 6;
5004         i++;
5005         if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
5006           c += buffer[i] & 0x3F;
5007           if (_major_version <= 47 || c == 0 || c >= 0x80) {
5008             // for classes with major > 47, c must a null or a character in its shortest form
5009             break;
5010           }
5011         }
5012         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5013       case 0xE:  // 1110xxxx 10xxxxxx 10xxxxxx
5014         c = (buffer[i] & 0xF) << 12;
5015         i += 2;
5016         if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
5017           c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
5018           if (_major_version <= 47 || c >= 0x800) {
5019             // for classes with major > 47, c must be in its shortest form
5020             break;
5021           }
5022         }
5023         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
5024     }  // end of switch
5025   } // end of for
5026 }
5027 
5028 // Checks if name is a legal class name.
5029 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) {
5030   if (!_need_verify || _relax_verify) { return; }
5031 
5032   char buf[fixed_buffer_size];
5033   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5034   unsigned int length = name->utf8_length();
5035   bool legal = false;
5036 
5037   if (length > 0) {
5038     char* p;
5039     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5040       p = skip_over_field_signature(bytes, false, length, CHECK);
5041       legal = (p != NULL) && ((p - bytes) == (int)length);
5042     } else if (_major_version < JAVA_1_5_VERSION) {
5043       if (bytes[0] != '<') {
5044         p = skip_over_field_name(bytes, true, length);
5045         legal = (p != NULL) && ((p - bytes) == (int)length);
5046       }
5047     } else {
5048       // 4900761: relax the constraints based on JSR202 spec
5049       // Class names may be drawn from the entire Unicode character set.
5050       // Identifiers between '/' must be unqualified names.
5051       // The utf8 string has been verified when parsing cpool entries.
5052       legal = verify_unqualified_name(bytes, length, LegalClass);
5053     }
5054   }
5055   if (!legal) {
5056     ResourceMark rm(THREAD);
5057     Exceptions::fthrow(
5058       THREAD_AND_LOCATION,
5059       vmSymbols::java_lang_ClassFormatError(),
5060       "Illegal class name \"%s\" in class file %s", bytes,
5061       _class_name->as_C_string()
5062     );
5063     return;
5064   }
5065 }
5066 
5067 // Checks if name is a legal field name.
5068 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) {
5069   if (!_need_verify || _relax_verify) { return; }
5070 
5071   char buf[fixed_buffer_size];
5072   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5073   unsigned int length = name->utf8_length();
5074   bool legal = false;
5075 
5076   if (length > 0) {
5077     if (_major_version < JAVA_1_5_VERSION) {
5078       if (bytes[0] != '<') {
5079         char* p = skip_over_field_name(bytes, false, length);
5080         legal = (p != NULL) && ((p - bytes) == (int)length);
5081       }
5082     } else {
5083       // 4881221: relax the constraints based on JSR202 spec
5084       legal = verify_unqualified_name(bytes, length, LegalField);
5085     }
5086   }
5087 
5088   if (!legal) {
5089     ResourceMark rm(THREAD);
5090     Exceptions::fthrow(
5091       THREAD_AND_LOCATION,
5092       vmSymbols::java_lang_ClassFormatError(),
5093       "Illegal field name \"%s\" in class %s", bytes,
5094       _class_name->as_C_string()
5095     );
5096     return;
5097   }
5098 }
5099 
5100 // Checks if name is a legal method name.
5101 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) {
5102   if (!_need_verify || _relax_verify) { return; }
5103 
5104   assert(name != NULL, "method name is null");
5105   char buf[fixed_buffer_size];
5106   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5107   unsigned int length = name->utf8_length();
5108   bool legal = false;
5109 
5110   if (length > 0) {
5111     if (bytes[0] == '<') {
5112       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
5113         legal = true;
5114       }
5115     } else if (_major_version < JAVA_1_5_VERSION) {
5116       char* p;
5117       p = skip_over_field_name(bytes, false, length);
5118       legal = (p != NULL) && ((p - bytes) == (int)length);
5119     } else {
5120       // 4881221: relax the constraints based on JSR202 spec
5121       legal = verify_unqualified_name(bytes, length, LegalMethod);
5122     }
5123   }
5124 
5125   if (!legal) {
5126     ResourceMark rm(THREAD);
5127     Exceptions::fthrow(
5128       THREAD_AND_LOCATION,
5129       vmSymbols::java_lang_ClassFormatError(),
5130       "Illegal method name \"%s\" in class %s", bytes,
5131       _class_name->as_C_string()
5132     );
5133     return;
5134   }
5135 }
5136 
5137 
5138 // Checks if signature is a legal field signature.
5139 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) {
5140   if (!_need_verify) { return; }
5141 
5142   char buf[fixed_buffer_size];
5143   char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5144   unsigned int length = signature->utf8_length();
5145   char* p = skip_over_field_signature(bytes, false, length, CHECK);
5146 
5147   if (p == NULL || (p - bytes) != (int)length) {
5148     throwIllegalSignature("Field", name, signature, CHECK);
5149   }
5150 }
5151 
5152 // Checks if signature is a legal method signature.
5153 // Returns number of parameters
5154 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) {
5155   if (!_need_verify) {
5156     // make sure caller's args_size will be less than 0 even for non-static
5157     // method so it will be recomputed in compute_size_of_parameters().
5158     return -2;
5159   }
5160 
5161   // Class initializers cannot have args for class format version >= 51.
5162   if (name == vmSymbols::class_initializer_name() &&
5163       signature != vmSymbols::void_method_signature() &&
5164       _major_version >= JAVA_7_VERSION) {
5165     throwIllegalSignature("Method", name, signature, CHECK_0);
5166     return 0;
5167   }
5168 
5169   unsigned int args_size = 0;
5170   char buf[fixed_buffer_size];
5171   char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5172   unsigned int length = signature->utf8_length();
5173   char* nextp;
5174 
5175   // The first character must be a '('
5176   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5177     length--;
5178     // Skip over legal field signatures
5179     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5180     while ((length > 0) && (nextp != NULL)) {
5181       args_size++;
5182       if (p[0] == 'J' || p[0] == 'D') {
5183         args_size++;
5184       }
5185       length -= nextp - p;
5186       p = nextp;
5187       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5188     }
5189     // The first non-signature thing better be a ')'
5190     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5191       length--;
5192       if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5193         // All internal methods must return void
5194         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5195           return args_size;
5196         }
5197       } else {
5198         // Now we better just have a return value
5199         nextp = skip_over_field_signature(p, true, length, CHECK_0);
5200         if (nextp && ((int)length == (nextp - p))) {
5201           return args_size;
5202         }
5203       }
5204     }
5205   }
5206   // Report error
5207   throwIllegalSignature("Method", name, signature, CHECK_0);
5208   return 0;
5209 }
5210 
5211 
5212 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5213 // Method names also may not contain the characters '<' or '>', unless <init>
5214 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
5215 // method.  Because these names have been checked as special cases before
5216 // calling this method in verify_legal_method_name.
5217 bool ClassFileParser::verify_unqualified_name(
5218     char* name, unsigned int length, int type) {
5219   jchar ch;
5220 
5221   for (char* p = name; p != name + length; ) {
5222     ch = *p;
5223     if (ch < 128) {
5224       p++;
5225       if (ch == '.' || ch == ';' || ch == '[' ) {
5226         return false;   // do not permit '.', ';', or '['
5227       }
5228       if (type != LegalClass && ch == '/') {
5229         return false;   // do not permit '/' unless it's class name
5230       }
5231       if (type == LegalMethod && (ch == '<' || ch == '>')) {
5232         return false;   // do not permit '<' or '>' in method names
5233       }
5234     } else {
5235       char* tmp_p = UTF8::next(p, &ch);
5236       p = tmp_p;
5237     }
5238   }
5239   return true;
5240 }
5241 
5242 
5243 // Take pointer to a string. Skip over the longest part of the string that could
5244 // be taken as a fieldname. Allow '/' if slash_ok is true.
5245 // Return a pointer to just past the fieldname.
5246 // Return NULL if no fieldname at all was found, or in the case of slash_ok
5247 // being true, we saw consecutive slashes (meaning we were looking for a
5248 // qualified path but found something that was badly-formed).
5249 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) {
5250   char* p;
5251   jchar ch;
5252   jboolean last_is_slash = false;
5253   jboolean not_first_ch = false;
5254 
5255   for (p = name; p != name + length; not_first_ch = true) {
5256     char* old_p = p;
5257     ch = *p;
5258     if (ch < 128) {
5259       p++;
5260       // quick check for ascii
5261       if ((ch >= 'a' && ch <= 'z') ||
5262           (ch >= 'A' && ch <= 'Z') ||
5263           (ch == '_' || ch == '$') ||
5264           (not_first_ch && ch >= '0' && ch <= '9')) {
5265         last_is_slash = false;
5266         continue;
5267       }
5268       if (slash_ok && ch == '/') {
5269         if (last_is_slash) {
5270           return NULL;  // Don't permit consecutive slashes
5271         }
5272         last_is_slash = true;
5273         continue;
5274       }
5275     } else {
5276       jint unicode_ch;
5277       char* tmp_p = UTF8::next_character(p, &unicode_ch);
5278       p = tmp_p;
5279       last_is_slash = false;
5280       // Check if ch is Java identifier start or is Java identifier part
5281       // 4672820: call java.lang.Character methods directly without generating separate tables.
5282       EXCEPTION_MARK;
5283       instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass());
5284 
5285       // return value
5286       JavaValue result(T_BOOLEAN);
5287       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
5288       JavaCallArguments args;
5289       args.push_int(unicode_ch);
5290 
5291       // public static boolean isJavaIdentifierStart(char ch);
5292       JavaCalls::call_static(&result,
5293                              klass,
5294                              vmSymbols::isJavaIdentifierStart_name(),
5295                              vmSymbols::int_bool_signature(),
5296                              &args,
5297                              THREAD);
5298 
5299       if (HAS_PENDING_EXCEPTION) {
5300         CLEAR_PENDING_EXCEPTION;
5301         return 0;
5302       }
5303       if (result.get_jboolean()) {
5304         continue;
5305       }
5306 
5307       if (not_first_ch) {
5308         // public static boolean isJavaIdentifierPart(char ch);
5309         JavaCalls::call_static(&result,
5310                                klass,
5311                                vmSymbols::isJavaIdentifierPart_name(),
5312                                vmSymbols::int_bool_signature(),
5313                                &args,
5314                                THREAD);
5315 
5316         if (HAS_PENDING_EXCEPTION) {
5317           CLEAR_PENDING_EXCEPTION;
5318           return 0;
5319         }
5320 
5321         if (result.get_jboolean()) {
5322           continue;
5323         }
5324       }
5325     }
5326     return (not_first_ch) ? old_p : NULL;
5327   }
5328   return (not_first_ch) ? p : NULL;
5329 }
5330 
5331 
5332 // Take pointer to a string. Skip over the longest part of the string that could
5333 // be taken as a field signature. Allow "void" if void_ok.
5334 // Return a pointer to just past the signature.
5335 // Return NULL if no legal signature is found.
5336 char* ClassFileParser::skip_over_field_signature(char* signature,
5337                                                  bool void_ok,
5338                                                  unsigned int length,
5339                                                  TRAPS) {
5340   unsigned int array_dim = 0;
5341   while (length > 0) {
5342     switch (signature[0]) {
5343       case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5344       case JVM_SIGNATURE_BOOLEAN:
5345       case JVM_SIGNATURE_BYTE:
5346       case JVM_SIGNATURE_CHAR:
5347       case JVM_SIGNATURE_SHORT:
5348       case JVM_SIGNATURE_INT:
5349       case JVM_SIGNATURE_FLOAT:
5350       case JVM_SIGNATURE_LONG:
5351       case JVM_SIGNATURE_DOUBLE:
5352         return signature + 1;
5353       case JVM_SIGNATURE_CLASS: {
5354         if (_major_version < JAVA_1_5_VERSION) {
5355           // Skip over the class name if one is there
5356           char* p = skip_over_field_name(signature + 1, true, --length);
5357 
5358           // The next character better be a semicolon
5359           if (p && (p - signature) > 1 && p[0] == ';') {
5360             return p + 1;
5361           }
5362         } else {
5363           // 4900761: For class version > 48, any unicode is allowed in class name.
5364           length--;
5365           signature++;
5366           while (length > 0 && signature[0] != ';') {
5367             if (signature[0] == '.') {
5368               classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
5369             }
5370             length--;
5371             signature++;
5372           }
5373           if (signature[0] == ';') { return signature + 1; }
5374         }
5375 
5376         return NULL;
5377       }
5378       case JVM_SIGNATURE_ARRAY:
5379         array_dim++;
5380         if (array_dim > 255) {
5381           // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
5382           classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
5383         }
5384         // The rest of what's there better be a legal signature
5385         signature++;
5386         length--;
5387         void_ok = false;
5388         break;
5389 
5390       default:
5391         return NULL;
5392     }
5393   }
5394   return NULL;
5395 }
--- EOF ---