1 /*
   2  * Copyright (c) 1997, 2016, 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 #include "precompiled.hpp"
  25 #include "classfile/classFileParser.hpp"
  26 #include "classfile/classFileStream.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/moduleEntry.hpp"
  32 #include "classfile/symbolTable.hpp"
  33 #include "classfile/systemDictionary.hpp"
  34 #include "classfile/verificationType.hpp"
  35 #include "classfile/verifier.hpp"
  36 #include "classfile/vmSymbols.hpp"
  37 #include "gc/shared/gcLocker.hpp"
  38 #include "logging/log.hpp"
  39 #include "memory/allocation.hpp"
  40 #include "memory/metadataFactory.hpp"
  41 #include "memory/oopFactory.hpp"
  42 #include "memory/resourceArea.hpp"
  43 #include "memory/universe.inline.hpp"
  44 #include "oops/annotations.hpp"
  45 #include "oops/fieldStreams.hpp"
  46 #include "oops/instanceKlass.hpp"
  47 #include "oops/instanceMirrorKlass.hpp"
  48 #include "oops/klass.inline.hpp"
  49 #include "oops/klassVtable.hpp"
  50 #include "oops/metadata.hpp"
  51 #include "oops/method.hpp"
  52 #include "oops/oop.inline.hpp"
  53 #include "oops/symbol.hpp"
  54 #include "prims/jvm.h"
  55 #include "prims/jvmtiExport.hpp"
  56 #include "prims/jvmtiThreadState.hpp"
  57 #include "runtime/javaCalls.hpp"
  58 #include "runtime/perfData.hpp"
  59 #include "runtime/reflection.hpp"
  60 #include "runtime/signature.hpp"
  61 #include "runtime/timer.hpp"
  62 #include "services/classLoadingService.hpp"
  63 #include "services/threadService.hpp"
  64 #include "trace/traceMacros.hpp"
  65 #include "utilities/array.hpp"
  66 #include "utilities/exceptions.hpp"
  67 #include "utilities/globalDefinitions.hpp"
  68 #include "utilities/macros.hpp"
  69 #include "utilities/ostream.hpp"
  70 #include "utilities/resourceHash.hpp"
  71 #if INCLUDE_CDS
  72 #include "classfile/systemDictionaryShared.hpp"
  73 #endif
  74 
  75 // We generally try to create the oops directly when parsing, rather than
  76 // allocating temporary data structures and copying the bytes twice. A
  77 // temporary area is only needed when parsing utf8 entries in the constant
  78 // pool and when parsing line number tables.
  79 
  80 // We add assert in debug mode when class format is not checked.
  81 
  82 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
  83 #define JAVA_MIN_SUPPORTED_VERSION        45
  84 #define JAVA_MAX_SUPPORTED_VERSION        53
  85 #define JAVA_MAX_SUPPORTED_MINOR_VERSION  0
  86 
  87 // Used for two backward compatibility reasons:
  88 // - to check for new additions to the class file format in JDK1.5
  89 // - to check for bug fixes in the format checker in JDK1.5
  90 #define JAVA_1_5_VERSION                  49
  91 
  92 // Used for backward compatibility reasons:
  93 // - to check for javac bug fixes that happened after 1.5
  94 // - also used as the max version when running in jdk6
  95 #define JAVA_6_VERSION                    50
  96 
  97 // Used for backward compatibility reasons:
  98 // - to disallow argument and require ACC_STATIC for <clinit> methods
  99 #define JAVA_7_VERSION                    51
 100 
 101 // Extension method support.
 102 #define JAVA_8_VERSION                    52
 103 
 104 #define JAVA_9_VERSION                    53
 105 
 106 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 107                                                   ConstantPool* cp,
 108                                                   const int length,
 109                                                   TRAPS) {
 110   assert(stream != NULL, "invariant");
 111   assert(cp != NULL, "invariant");
 112 
 113   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 114   // this function (_current can be allocated in a register, with scalar
 115   // replacement of aggregates). The _current pointer is copied back to
 116   // stream() when this function returns. DON'T call another method within
 117   // this method that uses stream().
 118   const ClassFileStream cfs1 = *stream;
 119   const ClassFileStream* const cfs = &cfs1;
 120 
 121   assert(cfs->allocated_on_stack(), "should be local");
 122   debug_only(const u1* const old_current = stream->current();)
 123 
 124   // Used for batching symbol allocations.
 125   const char* names[SymbolTable::symbol_alloc_batch_size];
 126   int lengths[SymbolTable::symbol_alloc_batch_size];
 127   int indices[SymbolTable::symbol_alloc_batch_size];
 128   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 129   int names_count = 0;
 130 
 131   // parsing  Index 0 is unused
 132   for (int index = 1; index < length; index++) {
 133     // Each of the following case guarantees one more byte in the stream
 134     // for the following tag or the access_flags following constant pool,
 135     // so we don't need bounds-check for reading tag.
 136     const u1 tag = cfs->get_u1_fast();
 137     switch (tag) {
 138       case JVM_CONSTANT_Class : {
 139         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 140         const u2 name_index = cfs->get_u2_fast();
 141         cp->klass_index_at_put(index, name_index);
 142         break;
 143       }
 144       case JVM_CONSTANT_Fieldref: {
 145         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 146         const u2 class_index = cfs->get_u2_fast();
 147         const u2 name_and_type_index = cfs->get_u2_fast();
 148         cp->field_at_put(index, class_index, name_and_type_index);
 149         break;
 150       }
 151       case JVM_CONSTANT_Methodref: {
 152         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 153         const u2 class_index = cfs->get_u2_fast();
 154         const u2 name_and_type_index = cfs->get_u2_fast();
 155         cp->method_at_put(index, class_index, name_and_type_index);
 156         break;
 157       }
 158       case JVM_CONSTANT_InterfaceMethodref: {
 159         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 160         const u2 class_index = cfs->get_u2_fast();
 161         const u2 name_and_type_index = cfs->get_u2_fast();
 162         cp->interface_method_at_put(index, class_index, name_and_type_index);
 163         break;
 164       }
 165       case JVM_CONSTANT_String : {
 166         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 167         const u2 string_index = cfs->get_u2_fast();
 168         cp->string_index_at_put(index, string_index);
 169         break;
 170       }
 171       case JVM_CONSTANT_MethodHandle :
 172       case JVM_CONSTANT_MethodType: {
 173         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 174           classfile_parse_error(
 175             "Class file version does not support constant tag %u in class file %s",
 176             tag, CHECK);
 177         }
 178         if (tag == JVM_CONSTANT_MethodHandle) {
 179           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 180           const u1 ref_kind = cfs->get_u1_fast();
 181           const u2 method_index = cfs->get_u2_fast();
 182           cp->method_handle_index_at_put(index, ref_kind, method_index);
 183         }
 184         else if (tag == JVM_CONSTANT_MethodType) {
 185           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 186           const u2 signature_index = cfs->get_u2_fast();
 187           cp->method_type_index_at_put(index, signature_index);
 188         }
 189         else {
 190           ShouldNotReachHere();
 191         }
 192         break;
 193       }
 194       case JVM_CONSTANT_InvokeDynamic : {
 195         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 196           classfile_parse_error(
 197               "Class file version does not support constant tag %u in class file %s",
 198               tag, CHECK);
 199         }
 200         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 201         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 202         const u2 name_and_type_index = cfs->get_u2_fast();
 203         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 204           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 205         }
 206         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 207         break;
 208       }
 209       case JVM_CONSTANT_Integer: {
 210         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 211         const u4 bytes = cfs->get_u4_fast();
 212         cp->int_at_put(index, (jint)bytes);
 213         break;
 214       }
 215       case JVM_CONSTANT_Float: {
 216         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 217         const u4 bytes = cfs->get_u4_fast();
 218         cp->float_at_put(index, *(jfloat*)&bytes);
 219         break;
 220       }
 221       case JVM_CONSTANT_Long: {
 222         // A mangled type might cause you to overrun allocated memory
 223         guarantee_property(index + 1 < length,
 224                            "Invalid constant pool entry %u in class file %s",
 225                            index,
 226                            CHECK);
 227         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 228         const u8 bytes = cfs->get_u8_fast();
 229         cp->long_at_put(index, bytes);
 230         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 231         break;
 232       }
 233       case JVM_CONSTANT_Double: {
 234         // A mangled type might cause you to overrun allocated memory
 235         guarantee_property(index+1 < length,
 236                            "Invalid constant pool entry %u in class file %s",
 237                            index,
 238                            CHECK);
 239         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 240         const u8 bytes = cfs->get_u8_fast();
 241         cp->double_at_put(index, *(jdouble*)&bytes);
 242         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 243         break;
 244       }
 245       case JVM_CONSTANT_NameAndType: {
 246         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 247         const u2 name_index = cfs->get_u2_fast();
 248         const u2 signature_index = cfs->get_u2_fast();
 249         cp->name_and_type_at_put(index, name_index, signature_index);
 250         break;
 251       }
 252       case JVM_CONSTANT_Utf8 : {
 253         cfs->guarantee_more(2, CHECK);  // utf8_length
 254         u2  utf8_length = cfs->get_u2_fast();
 255         const u1* utf8_buffer = cfs->get_u1_buffer();
 256         assert(utf8_buffer != NULL, "null utf8 buffer");
 257         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 258         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 259         cfs->skip_u1_fast(utf8_length);
 260 
 261         // Before storing the symbol, make sure it's legal
 262         if (_need_verify) {
 263           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 264         }
 265 
 266         if (has_cp_patch_at(index)) {
 267           Handle patch = clear_cp_patch_at(index);
 268           guarantee_property(java_lang_String::is_instance(patch()),
 269                              "Illegal utf8 patch at %d in class file %s",
 270                              index,
 271                              CHECK);
 272           const char* const str = java_lang_String::as_utf8_string(patch());
 273           // (could use java_lang_String::as_symbol instead, but might as well batch them)
 274           utf8_buffer = (const u1*) str;
 275           utf8_length = (int) strlen(str);
 276         }
 277 
 278         unsigned int hash;
 279         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 280                                                         utf8_length,
 281                                                         hash);
 282         if (result == NULL) {
 283           names[names_count] = (const char*)utf8_buffer;
 284           lengths[names_count] = utf8_length;
 285           indices[names_count] = index;
 286           hashValues[names_count++] = hash;
 287           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 288             SymbolTable::new_symbols(_loader_data,
 289                                      cp,
 290                                      names_count,
 291                                      names,
 292                                      lengths,
 293                                      indices,
 294                                      hashValues,
 295                                      CHECK);
 296             names_count = 0;
 297           }
 298         } else {
 299           cp->symbol_at_put(index, result);
 300         }
 301         break;
 302       }
 303       default: {
 304         classfile_parse_error("Unknown constant tag %u in class file %s",
 305                               tag,
 306                               CHECK);
 307         break;
 308       }
 309     } // end of switch(tag)
 310   } // end of for
 311 
 312   // Allocate the remaining symbols
 313   if (names_count > 0) {
 314     SymbolTable::new_symbols(_loader_data,
 315                              cp,
 316                              names_count,
 317                              names,
 318                              lengths,
 319                              indices,
 320                              hashValues,
 321                              CHECK);
 322   }
 323 
 324   // Copy _current pointer of local copy back to stream.
 325   assert(stream->current() == old_current, "non-exclusive use of stream");
 326   stream->set_current(cfs1.current());
 327 
 328 }
 329 
 330 static inline bool valid_cp_range(int index, int length) {
 331   return (index > 0 && index < length);
 332 }
 333 
 334 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 335   assert(cp != NULL, "invariant");
 336   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 337     return cp->symbol_at(index);
 338   }
 339   return NULL;
 340 }
 341 
 342 #ifdef ASSERT
 343 PRAGMA_DIAG_PUSH
 344 PRAGMA_FORMAT_NONLITERAL_IGNORED
 345 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
 346   ResourceMark rm(THREAD);
 347   fatal(msg, _class_name->as_C_string());
 348 }
 349 
 350 void ClassFileParser::report_assert_property_failure(const char* msg,
 351                                                      int index,
 352                                                      TRAPS) const {
 353   ResourceMark rm(THREAD);
 354   fatal(msg, index, _class_name->as_C_string());
 355 }
 356 PRAGMA_DIAG_POP
 357 #endif
 358 
 359 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 360                                           ConstantPool* const cp,
 361                                           const int length,
 362                                           TRAPS) {
 363   assert(cp != NULL, "invariant");
 364   assert(stream != NULL, "invariant");
 365 
 366   // parsing constant pool entries
 367   parse_constant_pool_entries(stream, cp, length, CHECK);
 368 
 369   int index = 1;  // declared outside of loops for portability
 370 
 371   // first verification pass - validate cross references
 372   // and fixup class and string constants
 373   for (index = 1; index < length; index++) {          // Index 0 is unused
 374     const jbyte tag = cp->tag_at(index).value();
 375     switch (tag) {
 376       case JVM_CONSTANT_Class: {
 377         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 378         break;
 379       }
 380       case JVM_CONSTANT_Fieldref:
 381         // fall through
 382       case JVM_CONSTANT_Methodref:
 383         // fall through
 384       case JVM_CONSTANT_InterfaceMethodref: {
 385         if (!_need_verify) break;
 386         const int klass_ref_index = cp->klass_ref_index_at(index);
 387         const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 388         check_property(valid_klass_reference_at(klass_ref_index),
 389                        "Invalid constant pool index %u in class file %s",
 390                        klass_ref_index, CHECK);
 391         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 392           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 393           "Invalid constant pool index %u in class file %s",
 394           name_and_type_ref_index, CHECK);
 395         break;
 396       }
 397       case JVM_CONSTANT_String: {
 398         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 399         break;
 400       }
 401       case JVM_CONSTANT_Integer:
 402         break;
 403       case JVM_CONSTANT_Float:
 404         break;
 405       case JVM_CONSTANT_Long:
 406       case JVM_CONSTANT_Double: {
 407         index++;
 408         check_property(
 409           (index < length && cp->tag_at(index).is_invalid()),
 410           "Improper constant pool long/double index %u in class file %s",
 411           index, CHECK);
 412         break;
 413       }
 414       case JVM_CONSTANT_NameAndType: {
 415         if (!_need_verify) break;
 416         const int name_ref_index = cp->name_ref_index_at(index);
 417         const int signature_ref_index = cp->signature_ref_index_at(index);
 418         check_property(valid_symbol_at(name_ref_index),
 419           "Invalid constant pool index %u in class file %s",
 420           name_ref_index, CHECK);
 421         check_property(valid_symbol_at(signature_ref_index),
 422           "Invalid constant pool index %u in class file %s",
 423           signature_ref_index, CHECK);
 424         break;
 425       }
 426       case JVM_CONSTANT_Utf8:
 427         break;
 428       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 429       case JVM_CONSTANT_UnresolvedClassInError: {
 430         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 431         break;
 432       }
 433       case JVM_CONSTANT_ClassIndex: {
 434         const int class_index = cp->klass_index_at(index);
 435         check_property(valid_symbol_at(class_index),
 436           "Invalid constant pool index %u in class file %s",
 437           class_index, CHECK);
 438         cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
 439         break;
 440       }
 441       case JVM_CONSTANT_StringIndex: {
 442         const int string_index = cp->string_index_at(index);
 443         check_property(valid_symbol_at(string_index),
 444           "Invalid constant pool index %u in class file %s",
 445           string_index, CHECK);
 446         Symbol* const sym = cp->symbol_at(string_index);
 447         cp->unresolved_string_at_put(index, sym);
 448         break;
 449       }
 450       case JVM_CONSTANT_MethodHandle: {
 451         const int ref_index = cp->method_handle_index_at(index);
 452         check_property(valid_cp_range(ref_index, length),
 453           "Invalid constant pool index %u in class file %s",
 454           ref_index, CHECK);
 455         const constantTag tag = cp->tag_at(ref_index);
 456         const int ref_kind = cp->method_handle_ref_kind_at(index);
 457 
 458         switch (ref_kind) {
 459           case JVM_REF_getField:
 460           case JVM_REF_getStatic:
 461           case JVM_REF_putField:
 462           case JVM_REF_putStatic: {
 463             check_property(
 464               tag.is_field(),
 465               "Invalid constant pool index %u in class file %s (not a field)",
 466               ref_index, CHECK);
 467             break;
 468           }
 469           case JVM_REF_invokeVirtual:
 470           case JVM_REF_newInvokeSpecial: {
 471             check_property(
 472               tag.is_method(),
 473               "Invalid constant pool index %u in class file %s (not a method)",
 474               ref_index, CHECK);
 475             break;
 476           }
 477           case JVM_REF_invokeStatic:
 478           case JVM_REF_invokeSpecial: {
 479             check_property(
 480               tag.is_method() ||
 481               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 482               "Invalid constant pool index %u in class file %s (not a method)",
 483               ref_index, CHECK);
 484             break;
 485           }
 486           case JVM_REF_invokeInterface: {
 487             check_property(
 488               tag.is_interface_method(),
 489               "Invalid constant pool index %u in class file %s (not an interface method)",
 490               ref_index, CHECK);
 491             break;
 492           }
 493           default: {
 494             classfile_parse_error(
 495               "Bad method handle kind at constant pool index %u in class file %s",
 496               index, CHECK);
 497           }
 498         } // switch(refkind)
 499         // Keep the ref_index unchanged.  It will be indirected at link-time.
 500         break;
 501       } // case MethodHandle
 502       case JVM_CONSTANT_MethodType: {
 503         const int ref_index = cp->method_type_index_at(index);
 504         check_property(valid_symbol_at(ref_index),
 505           "Invalid constant pool index %u in class file %s",
 506           ref_index, CHECK);
 507         break;
 508       }
 509       case JVM_CONSTANT_InvokeDynamic: {
 510         const int name_and_type_ref_index =
 511           cp->invoke_dynamic_name_and_type_ref_index_at(index);
 512 
 513         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 514           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 515           "Invalid constant pool index %u in class file %s",
 516           name_and_type_ref_index, CHECK);
 517         // bootstrap specifier index must be checked later,
 518         // when BootstrapMethods attr is available
 519         break;
 520       }
 521       default: {
 522         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 523         ShouldNotReachHere();
 524         break;
 525       }
 526     } // switch(tag)
 527   } // end of for
 528 
 529   if (_cp_patches != NULL) {
 530     // need to treat this_class specially...
 531     int this_class_index;
 532     {
 533       stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
 534       const u1* const mark = stream->current();
 535       stream->skip_u2_fast(1); // skip flags
 536       this_class_index = stream->get_u2_fast();
 537       stream->set_current(mark);  // revert to mark
 538     }
 539 
 540     for (index = 1; index < length; index++) {          // Index 0 is unused
 541       if (has_cp_patch_at(index)) {
 542         guarantee_property(index != this_class_index,
 543           "Illegal constant pool patch to self at %d in class file %s",
 544           index, CHECK);
 545         patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
 546       }
 547     }
 548   }
 549 
 550   if (!_need_verify) {
 551     return;
 552   }
 553 
 554   // second verification pass - checks the strings are of the right format.
 555   // but not yet to the other entries
 556   for (index = 1; index < length; index++) {
 557     const jbyte tag = cp->tag_at(index).value();
 558     switch (tag) {
 559       case JVM_CONSTANT_UnresolvedClass: {
 560         const Symbol* const class_name = cp->klass_name_at(index);
 561         // check the name, even if _cp_patches will overwrite it
 562         verify_legal_class_name(class_name, CHECK);
 563         break;
 564       }
 565       case JVM_CONSTANT_NameAndType: {
 566         if (_need_verify) {
 567           const int sig_index = cp->signature_ref_index_at(index);
 568           const int name_index = cp->name_ref_index_at(index);
 569           const Symbol* const name = cp->symbol_at(name_index);
 570           const Symbol* const sig = cp->symbol_at(sig_index);
 571           guarantee_property(sig->utf8_length() != 0,
 572             "Illegal zero length constant pool entry at %d in class %s",
 573             sig_index, CHECK);
 574           guarantee_property(name->utf8_length() != 0,
 575             "Illegal zero length constant pool entry at %d in class %s",
 576             name_index, CHECK);
 577 
 578           if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
 579             // Format check method name and signature
 580             verify_legal_method_name(name, CHECK);
 581             verify_legal_method_signature(name, sig, CHECK);
 582           } else {
 583             // Format check field name and signature
 584             verify_legal_field_name(name, CHECK);
 585             verify_legal_field_signature(name, sig, CHECK);
 586           }
 587         }
 588         break;
 589       }
 590       case JVM_CONSTANT_InvokeDynamic:
 591       case JVM_CONSTANT_Fieldref:
 592       case JVM_CONSTANT_Methodref:
 593       case JVM_CONSTANT_InterfaceMethodref: {
 594         const int name_and_type_ref_index =
 595           cp->name_and_type_ref_index_at(index);
 596         // already verified to be utf8
 597         const int name_ref_index =
 598           cp->name_ref_index_at(name_and_type_ref_index);
 599         // already verified to be utf8
 600         const int signature_ref_index =
 601           cp->signature_ref_index_at(name_and_type_ref_index);
 602         const Symbol* const name = cp->symbol_at(name_ref_index);
 603         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 604         if (tag == JVM_CONSTANT_Fieldref) {
 605           if (_need_verify) {
 606             // Field name and signature are verified above, when iterating NameAndType_info.
 607             // Need only to be sure signature is non-zero length and the right type.
 608             if (signature->utf8_length() == 0 ||
 609                 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
 610               throwIllegalSignature("Field", name, signature, CHECK);
 611             }
 612           }
 613         } else {
 614           if (_need_verify) {
 615             // Method name and signature are verified above, when iterating NameAndType_info.
 616             // Need only to be sure signature is non-zero length and the right type.
 617             if (signature->utf8_length() == 0 ||
 618                 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
 619               throwIllegalSignature("Method", name, signature, CHECK);
 620             }
 621           }
 622           // 4509014: If a class method name begins with '<', it must be "<init>"
 623           const unsigned int name_len = name->utf8_length();
 624           if (tag == JVM_CONSTANT_Methodref &&
 625               name_len != 0 &&
 626               name->byte_at(0) == '<' &&
 627               name != vmSymbols::object_initializer_name()) {
 628             classfile_parse_error(
 629               "Bad method name at constant pool index %u in class file %s",
 630               name_ref_index, CHECK);
 631           }
 632         }
 633         break;
 634       }
 635       case JVM_CONSTANT_MethodHandle: {
 636         const int ref_index = cp->method_handle_index_at(index);
 637         const int ref_kind = cp->method_handle_ref_kind_at(index);
 638         switch (ref_kind) {
 639           case JVM_REF_invokeVirtual:
 640           case JVM_REF_invokeStatic:
 641           case JVM_REF_invokeSpecial:
 642           case JVM_REF_newInvokeSpecial: {
 643             const int name_and_type_ref_index =
 644               cp->name_and_type_ref_index_at(ref_index);
 645             const int name_ref_index =
 646               cp->name_ref_index_at(name_and_type_ref_index);
 647             const Symbol* const name = cp->symbol_at(name_ref_index);
 648             if (ref_kind == JVM_REF_newInvokeSpecial) {
 649               if (name != vmSymbols::object_initializer_name()) {
 650                 classfile_parse_error(
 651                   "Bad constructor name at constant pool index %u in class file %s",
 652                     name_ref_index, CHECK);
 653               }
 654             } else {
 655               if (name == vmSymbols::object_initializer_name()) {
 656                 classfile_parse_error(
 657                   "Bad method name at constant pool index %u in class file %s",
 658                   name_ref_index, CHECK);
 659               }
 660             }
 661             break;
 662           }
 663           // Other ref_kinds are already fully checked in previous pass.
 664         } // switch(ref_kind)
 665         break;
 666       }
 667       case JVM_CONSTANT_MethodType: {
 668         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 669         const Symbol* const signature = cp->method_type_signature_at(index);
 670         verify_legal_method_signature(no_name, signature, CHECK);
 671         break;
 672       }
 673       case JVM_CONSTANT_Utf8: {
 674         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 675       }
 676     }  // switch(tag)
 677   }  // end of for
 678 }
 679 
 680 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
 681                                           int index,
 682                                           Handle patch,
 683                                           TRAPS) {
 684   assert(cp != NULL, "invariant");
 685 
 686   BasicType patch_type = T_VOID;
 687 
 688   switch (cp->tag_at(index).value()) {
 689 
 690     case JVM_CONSTANT_UnresolvedClass: {
 691       // Patching a class means pre-resolving it.
 692       // The name in the constant pool is ignored.
 693       if (java_lang_Class::is_instance(patch())) {
 694         guarantee_property(!java_lang_Class::is_primitive(patch()),
 695                            "Illegal class patch at %d in class file %s",
 696                            index, CHECK);
 697         cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
 698       } else {
 699         guarantee_property(java_lang_String::is_instance(patch()),
 700                            "Illegal class patch at %d in class file %s",
 701                            index, CHECK);
 702         Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
 703         cp->unresolved_klass_at_put(index, name);
 704       }
 705       break;
 706     }
 707 
 708     case JVM_CONSTANT_String: {
 709       // skip this patch and don't clear it.  Needs the oop array for resolved
 710       // references to be created first.
 711       return;
 712     }
 713     case JVM_CONSTANT_Integer: patch_type = T_INT;    goto patch_prim;
 714     case JVM_CONSTANT_Float:   patch_type = T_FLOAT;  goto patch_prim;
 715     case JVM_CONSTANT_Long:    patch_type = T_LONG;   goto patch_prim;
 716     case JVM_CONSTANT_Double:  patch_type = T_DOUBLE; goto patch_prim;
 717     patch_prim:
 718     {
 719       jvalue value;
 720       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 721       guarantee_property(value_type == patch_type,
 722                          "Illegal primitive patch at %d in class file %s",
 723                          index, CHECK);
 724       switch (value_type) {
 725         case T_INT:    cp->int_at_put(index,   value.i); break;
 726         case T_FLOAT:  cp->float_at_put(index, value.f); break;
 727         case T_LONG:   cp->long_at_put(index,  value.j); break;
 728         case T_DOUBLE: cp->double_at_put(index, value.d); break;
 729         default:       assert(false, "");
 730       }
 731     } // end patch_prim label
 732     break;
 733 
 734     default: {
 735       // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 736       guarantee_property(!has_cp_patch_at(index),
 737                          "Illegal unexpected patch at %d in class file %s",
 738                          index, CHECK);
 739       return;
 740     }
 741   } // end of switch(tag)
 742 
 743   // On fall-through, mark the patch as used.
 744   clear_cp_patch_at(index);
 745 }
 746 class NameSigHash: public ResourceObj {
 747  public:
 748   const Symbol*       _name;       // name
 749   const Symbol*       _sig;        // signature
 750   NameSigHash*  _next;             // Next entry in hash table
 751 };
 752 
 753 static const int HASH_ROW_SIZE = 256;
 754 
 755 static unsigned int hash(const Symbol* name, const Symbol* sig) {
 756   unsigned int raw_hash = 0;
 757   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 758   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 759 
 760   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 761 }
 762 
 763 
 764 static void initialize_hashtable(NameSigHash** table) {
 765   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 766 }
 767 // Return false if the name/sig combination is found in table.
 768 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 769 // The old format checker uses heap sort to find duplicates.
 770 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 771 // of table since we don't expect Symbol*'s to move.
 772 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
 773   assert(name != NULL, "name in constant pool is NULL");
 774 
 775   // First lookup for duplicates
 776   int index = hash(name, sig);
 777   NameSigHash* entry = table[index];
 778   while (entry != NULL) {
 779     if (entry->_name == name && entry->_sig == sig) {
 780       return false;
 781     }
 782     entry = entry->_next;
 783   }
 784 
 785   // No duplicate is found, allocate a new entry and fill it.
 786   entry = new NameSigHash();
 787   entry->_name = name;
 788   entry->_sig = sig;
 789 
 790   // Insert into hash table
 791   entry->_next = table[index];
 792   table[index] = entry;
 793 
 794   return true;
 795 }
 796 
 797 // Side-effects: populates the _local_interfaces field
 798 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
 799                                        const int itfs_len,
 800                                        ConstantPool* const cp,
 801                                        bool* const has_nonstatic_concrete_methods,
 802                                        TRAPS) {
 803   assert(stream != NULL, "invariant");
 804   assert(cp != NULL, "invariant");
 805   assert(has_nonstatic_concrete_methods != NULL, "invariant");
 806 
 807   if (itfs_len == 0) {
 808     _local_interfaces = Universe::the_empty_klass_array();
 809   } else {
 810     assert(itfs_len > 0, "only called for len>0");
 811     _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
 812 
 813     int index;
 814     for (index = 0; index < itfs_len; index++) {
 815       const u2 interface_index = stream->get_u2(CHECK);
 816       KlassHandle interf;
 817       check_property(
 818         valid_klass_reference_at(interface_index),
 819         "Interface name has bad constant pool index %u in class file %s",
 820         interface_index, CHECK);
 821       if (cp->tag_at(interface_index).is_klass()) {
 822         interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
 823       } else {
 824         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
 825 
 826         // Don't need to check legal name because it's checked when parsing constant pool.
 827         // But need to make sure it's not an array type.
 828         guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 829                            "Bad interface name in class file %s", CHECK);
 830 
 831         // Call resolve_super so classcircularity is checked
 832         const Klass* const k =
 833           SystemDictionary::resolve_super_or_fail(_class_name,
 834                                                   unresolved_klass,
 835                                                   _loader_data->class_loader(),
 836                                                   _protection_domain,
 837                                                   false,
 838                                                   CHECK);
 839         interf = KlassHandle(THREAD, k);
 840       }
 841 
 842       if (!interf()->is_interface()) {
 843         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 844                    "Implementing class");
 845       }
 846 
 847       if (InstanceKlass::cast(interf())->has_nonstatic_concrete_methods()) {
 848         *has_nonstatic_concrete_methods = true;
 849       }
 850       _local_interfaces->at_put(index, interf());
 851     }
 852 
 853     if (!_need_verify || itfs_len <= 1) {
 854       return;
 855     }
 856 
 857     // Check if there's any duplicates in interfaces
 858     ResourceMark rm(THREAD);
 859     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
 860                                                                  NameSigHash*,
 861                                                                  HASH_ROW_SIZE);
 862     initialize_hashtable(interface_names);
 863     bool dup = false;
 864     {
 865       debug_only(NoSafepointVerifier nsv;)
 866       for (index = 0; index < itfs_len; index++) {
 867         const Klass* const k = _local_interfaces->at(index);
 868         const Symbol* const name = InstanceKlass::cast(k)->name();
 869         // If no duplicates, add (name, NULL) in hashtable interface_names.
 870         if (!put_after_lookup(name, NULL, interface_names)) {
 871           dup = true;
 872           break;
 873         }
 874       }
 875     }
 876     if (dup) {
 877       classfile_parse_error("Duplicate interface name in class file %s", CHECK);
 878     }
 879   }
 880 }
 881 
 882 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 883                                            int constantvalue_index,
 884                                            int signature_index,
 885                                            TRAPS) const {
 886   // Make sure the constant pool entry is of a type appropriate to this field
 887   guarantee_property(
 888     (constantvalue_index > 0 &&
 889       constantvalue_index < cp->length()),
 890     "Bad initial value index %u in ConstantValue attribute in class file %s",
 891     constantvalue_index, CHECK);
 892 
 893   const constantTag value_type = cp->tag_at(constantvalue_index);
 894   switch(cp->basic_type_for_signature_at(signature_index)) {
 895     case T_LONG: {
 896       guarantee_property(value_type.is_long(),
 897                          "Inconsistent constant value type in class file %s",
 898                          CHECK);
 899       break;
 900     }
 901     case T_FLOAT: {
 902       guarantee_property(value_type.is_float(),
 903                          "Inconsistent constant value type in class file %s",
 904                          CHECK);
 905       break;
 906     }
 907     case T_DOUBLE: {
 908       guarantee_property(value_type.is_double(),
 909                          "Inconsistent constant value type in class file %s",
 910                          CHECK);
 911       break;
 912     }
 913     case T_BYTE:
 914     case T_CHAR:
 915     case T_SHORT:
 916     case T_BOOLEAN:
 917     case T_INT: {
 918       guarantee_property(value_type.is_int(),
 919                          "Inconsistent constant value type in class file %s",
 920                          CHECK);
 921       break;
 922     }
 923     case T_OBJECT: {
 924       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 925                          && value_type.is_string()),
 926                          "Bad string initial value in class file %s",
 927                          CHECK);
 928       break;
 929     }
 930     default: {
 931       classfile_parse_error("Unable to set initial value %u in class file %s",
 932                              constantvalue_index,
 933                              CHECK);
 934     }
 935   }
 936 }
 937 
 938 class AnnotationCollector : public ResourceObj{
 939 public:
 940   enum Location { _in_field, _in_method, _in_class };
 941   enum ID {
 942     _unknown = 0,
 943     _method_CallerSensitive,
 944     _method_ForceInline,
 945     _method_DontInline,
 946     _method_InjectedProfile,
 947     _method_LambdaForm_Compiled,
 948     _method_LambdaForm_Hidden,
 949     _method_HotSpotIntrinsicCandidate,
 950     _jdk_internal_vm_annotation_Contended,
 951     _field_Stable,
 952     _jdk_internal_vm_annotation_ReservedStackAccess,
 953     _annotation_LIMIT
 954   };
 955   const Location _location;
 956   int _annotations_present;
 957   u2 _contended_group;
 958 
 959   AnnotationCollector(Location location)
 960     : _location(location), _annotations_present(0)
 961   {
 962     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
 963   }
 964   // If this annotation name has an ID, report it (or _none).
 965   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
 966   // Set the annotation name:
 967   void set_annotation(ID id) {
 968     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 969     _annotations_present |= nth_bit((int)id);
 970   }
 971 
 972   void remove_annotation(ID id) {
 973     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 974     _annotations_present &= ~nth_bit((int)id);
 975   }
 976 
 977   // Report if the annotation is present.
 978   bool has_any_annotations() const { return _annotations_present != 0; }
 979   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
 980 
 981   void set_contended_group(u2 group) { _contended_group = group; }
 982   u2 contended_group() const { return _contended_group; }
 983 
 984   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
 985 
 986   void set_stable(bool stable) { set_annotation(_field_Stable); }
 987   bool is_stable() const { return has_annotation(_field_Stable); }
 988 };
 989 
 990 // This class also doubles as a holder for metadata cleanup.
 991 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
 992 private:
 993   ClassLoaderData* _loader_data;
 994   AnnotationArray* _field_annotations;
 995   AnnotationArray* _field_type_annotations;
 996 public:
 997   FieldAnnotationCollector(ClassLoaderData* loader_data) :
 998     AnnotationCollector(_in_field),
 999     _loader_data(loader_data),
1000     _field_annotations(NULL),
1001     _field_type_annotations(NULL) {}
1002   ~FieldAnnotationCollector();
1003   void apply_to(FieldInfo* f);
1004   AnnotationArray* field_annotations()      { return _field_annotations; }
1005   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1006 
1007   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
1008   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1009 };
1010 
1011 class MethodAnnotationCollector : public AnnotationCollector{
1012 public:
1013   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1014   void apply_to(methodHandle m);
1015 };
1016 
1017 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1018 public:
1019   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1020   void apply_to(InstanceKlass* ik);
1021 };
1022 
1023 
1024 static int skip_annotation_value(const u1*, int, int); // fwd decl
1025 
1026 // Skip an annotation.  Return >=limit if there is any problem.
1027 static int skip_annotation(const u1* buffer, int limit, int index) {
1028   assert(buffer != NULL, "invariant");
1029   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1030   // value := switch (tag:u1) { ... }
1031   index += 2;  // skip atype
1032   if ((index += 2) >= limit)  return limit;  // read nmem
1033   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1034   while (--nmem >= 0 && index < limit) {
1035     index += 2; // skip member
1036     index = skip_annotation_value(buffer, limit, index);
1037   }
1038   return index;
1039 }
1040 
1041 // Skip an annotation value.  Return >=limit if there is any problem.
1042 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1043   assert(buffer != NULL, "invariant");
1044 
1045   // value := switch (tag:u1) {
1046   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1047   //   case e: e_class:u2 e_name:u2;
1048   //   case s: s_con:u2;
1049   //   case [: do(nval:u2) {value};
1050   //   case @: annotation;
1051   //   case s: s_con:u2;
1052   // }
1053   if ((index += 1) >= limit)  return limit;  // read tag
1054   const u1 tag = buffer[index - 1];
1055   switch (tag) {
1056     case 'B':
1057     case 'C':
1058     case 'I':
1059     case 'S':
1060     case 'Z':
1061     case 'D':
1062     case 'F':
1063     case 'J':
1064     case 'c':
1065     case 's':
1066       index += 2;  // skip con or s_con
1067       break;
1068     case 'e':
1069       index += 4;  // skip e_class, e_name
1070       break;
1071     case '[':
1072     {
1073       if ((index += 2) >= limit)  return limit;  // read nval
1074       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1075       while (--nval >= 0 && index < limit) {
1076         index = skip_annotation_value(buffer, limit, index);
1077       }
1078     }
1079     break;
1080     case '@':
1081       index = skip_annotation(buffer, limit, index);
1082       break;
1083     default:
1084       return limit;  //  bad tag byte
1085   }
1086   return index;
1087 }
1088 
1089 // Sift through annotations, looking for those significant to the VM:
1090 static void parse_annotations(const ConstantPool* const cp,
1091                               const u1* buffer, int limit,
1092                               AnnotationCollector* coll,
1093                               ClassLoaderData* loader_data,
1094                               TRAPS) {
1095 
1096   assert(cp != NULL, "invariant");
1097   assert(buffer != NULL, "invariant");
1098   assert(coll != NULL, "invariant");
1099   assert(loader_data != NULL, "invariant");
1100 
1101   // annotations := do(nann:u2) {annotation}
1102   int index = 0;
1103   if ((index += 2) >= limit)  return;  // read nann
1104   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1105   enum {  // initial annotation layout
1106     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1107     count_off = 2,      // u2   such as 1 (one value)
1108     member_off = 4,     // utf8 such as 'value'
1109     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1110     e_tag_val = 'e',
1111     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1112     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1113     e_size = 11,     // end of 'e' annotation
1114     c_tag_val = 'c',    // payload is type
1115     c_con_off = 7,    // utf8 payload, such as 'I'
1116     c_size = 9,       // end of 'c' annotation
1117     s_tag_val = 's',    // payload is String
1118     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1119     s_size = 9,
1120     min_size = 6        // smallest possible size (zero members)
1121   };
1122   while ((--nann) >= 0 && (index - 2 + min_size <= limit)) {
1123     int index0 = index;
1124     index = skip_annotation(buffer, limit, index);
1125     const u1* const abase = buffer + index0;
1126     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1127     const int count = Bytes::get_Java_u2((address)abase + count_off);
1128     const Symbol* const aname = check_symbol_at(cp, atype);
1129     if (aname == NULL)  break;  // invalid annotation name
1130     const Symbol* member = NULL;
1131     if (count >= 1) {
1132       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1133       member = check_symbol_at(cp, member_index);
1134       if (member == NULL)  break;  // invalid member name
1135     }
1136 
1137     // Here is where parsing particular annotations will take place.
1138     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1139     if (AnnotationCollector::_unknown == id)  continue;
1140     coll->set_annotation(id);
1141 
1142     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1143       // @Contended can optionally specify the contention group.
1144       //
1145       // Contended group defines the equivalence class over the fields:
1146       // the fields within the same contended group are not treated distinct.
1147       // The only exception is default group, which does not incur the
1148       // equivalence. Naturally, contention group for classes is meaningless.
1149       //
1150       // While the contention group is specified as String, annotation
1151       // values are already interned, and we might as well use the constant
1152       // pool index as the group tag.
1153       //
1154       u2 group_index = 0; // default contended group
1155       if (count == 1
1156         && s_size == (index - index0)  // match size
1157         && s_tag_val == *(abase + tag_off)
1158         && member == vmSymbols::value_name()) {
1159         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1160         if (cp->symbol_at(group_index)->utf8_length() == 0) {
1161           group_index = 0; // default contended group
1162         }
1163       }
1164       coll->set_contended_group(group_index);
1165     }
1166   }
1167 }
1168 
1169 
1170 // Parse attributes for a field.
1171 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1172                                              u2 attributes_count,
1173                                              bool is_static, u2 signature_index,
1174                                              u2* const constantvalue_index_addr,
1175                                              bool* const is_synthetic_addr,
1176                                              u2* const generic_signature_index_addr,
1177                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1178                                              TRAPS) {
1179   assert(cfs != NULL, "invariant");
1180   assert(constantvalue_index_addr != NULL, "invariant");
1181   assert(is_synthetic_addr != NULL, "invariant");
1182   assert(generic_signature_index_addr != NULL, "invariant");
1183   assert(parsed_annotations != NULL, "invariant");
1184   assert(attributes_count > 0, "attributes_count should be greater than 0");
1185 
1186   u2 constantvalue_index = 0;
1187   u2 generic_signature_index = 0;
1188   bool is_synthetic = false;
1189   const u1* runtime_visible_annotations = NULL;
1190   int runtime_visible_annotations_length = 0;
1191   const u1* runtime_invisible_annotations = NULL;
1192   int runtime_invisible_annotations_length = 0;
1193   const u1* runtime_visible_type_annotations = NULL;
1194   int runtime_visible_type_annotations_length = 0;
1195   const u1* runtime_invisible_type_annotations = NULL;
1196   int runtime_invisible_type_annotations_length = 0;
1197   bool runtime_invisible_annotations_exists = false;
1198   bool runtime_invisible_type_annotations_exists = false;
1199   const ConstantPool* const cp = _cp;
1200 
1201   while (attributes_count--) {
1202     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1203     const u2 attribute_name_index = cfs->get_u2_fast();
1204     const u4 attribute_length = cfs->get_u4_fast();
1205     check_property(valid_symbol_at(attribute_name_index),
1206                    "Invalid field attribute index %u in class file %s",
1207                    attribute_name_index,
1208                    CHECK);
1209 
1210     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1211     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1212       // ignore if non-static
1213       if (constantvalue_index != 0) {
1214         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1215       }
1216       check_property(
1217         attribute_length == 2,
1218         "Invalid ConstantValue field attribute length %u in class file %s",
1219         attribute_length, CHECK);
1220 
1221       constantvalue_index = cfs->get_u2(CHECK);
1222       if (_need_verify) {
1223         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1224       }
1225     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1226       if (attribute_length != 0) {
1227         classfile_parse_error(
1228           "Invalid Synthetic field attribute length %u in class file %s",
1229           attribute_length, CHECK);
1230       }
1231       is_synthetic = true;
1232     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1233       if (attribute_length != 0) {
1234         classfile_parse_error(
1235           "Invalid Deprecated field attribute length %u in class file %s",
1236           attribute_length, CHECK);
1237       }
1238     } else if (_major_version >= JAVA_1_5_VERSION) {
1239       if (attribute_name == vmSymbols::tag_signature()) {
1240         if (attribute_length != 2) {
1241           classfile_parse_error(
1242             "Wrong size %u for field's Signature attribute in class file %s",
1243             attribute_length, CHECK);
1244         }
1245         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1246       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1247         if (runtime_visible_annotations != NULL) {
1248           classfile_parse_error(
1249             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1250         }
1251         runtime_visible_annotations_length = attribute_length;
1252         runtime_visible_annotations = cfs->get_u1_buffer();
1253         assert(runtime_visible_annotations != NULL, "null visible annotations");
1254         parse_annotations(cp,
1255                           runtime_visible_annotations,
1256                           runtime_visible_annotations_length,
1257                           parsed_annotations,
1258                           _loader_data,
1259                           CHECK);
1260         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
1261       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1262         if (runtime_invisible_annotations_exists) {
1263           classfile_parse_error(
1264             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1265         }
1266         runtime_invisible_annotations_exists = true;
1267         if (PreserveAllAnnotations) {
1268           runtime_invisible_annotations_length = attribute_length;
1269           runtime_invisible_annotations = cfs->get_u1_buffer();
1270           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1271         }
1272         cfs->skip_u1(attribute_length, CHECK);
1273       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1274         if (runtime_visible_type_annotations != NULL) {
1275           classfile_parse_error(
1276             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1277         }
1278         runtime_visible_type_annotations_length = attribute_length;
1279         runtime_visible_type_annotations = cfs->get_u1_buffer();
1280         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1281         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1282       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1283         if (runtime_invisible_type_annotations_exists) {
1284           classfile_parse_error(
1285             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1286         } else {
1287           runtime_invisible_type_annotations_exists = true;
1288         }
1289         if (PreserveAllAnnotations) {
1290           runtime_invisible_type_annotations_length = attribute_length;
1291           runtime_invisible_type_annotations = cfs->get_u1_buffer();
1292           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1293         }
1294         cfs->skip_u1(attribute_length, CHECK);
1295       } else {
1296         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1297       }
1298     } else {
1299       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1300     }
1301   }
1302 
1303   *constantvalue_index_addr = constantvalue_index;
1304   *is_synthetic_addr = is_synthetic;
1305   *generic_signature_index_addr = generic_signature_index;
1306   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1307                                             runtime_visible_annotations_length,
1308                                             runtime_invisible_annotations,
1309                                             runtime_invisible_annotations_length,
1310                                             CHECK);
1311   parsed_annotations->set_field_annotations(a);
1312   a = assemble_annotations(runtime_visible_type_annotations,
1313                            runtime_visible_type_annotations_length,
1314                            runtime_invisible_type_annotations,
1315                            runtime_invisible_type_annotations_length,
1316                            CHECK);
1317   parsed_annotations->set_field_type_annotations(a);
1318   return;
1319 }
1320 
1321 
1322 // Field allocation types. Used for computing field offsets.
1323 
1324 enum FieldAllocationType {
1325   STATIC_OOP,           // Oops
1326   STATIC_BYTE,          // Boolean, Byte, char
1327   STATIC_SHORT,         // shorts
1328   STATIC_WORD,          // ints
1329   STATIC_DOUBLE,        // aligned long or double
1330   NONSTATIC_OOP,
1331   NONSTATIC_BYTE,
1332   NONSTATIC_SHORT,
1333   NONSTATIC_WORD,
1334   NONSTATIC_DOUBLE,
1335   MAX_FIELD_ALLOCATION_TYPE,
1336   BAD_ALLOCATION_TYPE = -1
1337 };
1338 
1339 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1340   BAD_ALLOCATION_TYPE, // 0
1341   BAD_ALLOCATION_TYPE, // 1
1342   BAD_ALLOCATION_TYPE, // 2
1343   BAD_ALLOCATION_TYPE, // 3
1344   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1345   NONSTATIC_SHORT,     // T_CHAR        =  5,
1346   NONSTATIC_WORD,      // T_FLOAT       =  6,
1347   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1348   NONSTATIC_BYTE,      // T_BYTE        =  8,
1349   NONSTATIC_SHORT,     // T_SHORT       =  9,
1350   NONSTATIC_WORD,      // T_INT         = 10,
1351   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1352   NONSTATIC_OOP,       // T_OBJECT      = 12,
1353   NONSTATIC_OOP,       // T_ARRAY       = 13,
1354   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1355   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1356   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1357   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1358   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1359   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1360   BAD_ALLOCATION_TYPE, // 0
1361   BAD_ALLOCATION_TYPE, // 1
1362   BAD_ALLOCATION_TYPE, // 2
1363   BAD_ALLOCATION_TYPE, // 3
1364   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1365   STATIC_SHORT,        // T_CHAR        =  5,
1366   STATIC_WORD,         // T_FLOAT       =  6,
1367   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1368   STATIC_BYTE,         // T_BYTE        =  8,
1369   STATIC_SHORT,        // T_SHORT       =  9,
1370   STATIC_WORD,         // T_INT         = 10,
1371   STATIC_DOUBLE,       // T_LONG        = 11,
1372   STATIC_OOP,          // T_OBJECT      = 12,
1373   STATIC_OOP,          // T_ARRAY       = 13,
1374   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1375   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1376   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1377   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1378   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1379   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1380 };
1381 
1382 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1383   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1384   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1385   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1386   return result;
1387 }
1388 
1389 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1390  public:
1391   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1392 
1393   FieldAllocationCount() {
1394     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1395       count[i] = 0;
1396     }
1397   }
1398 
1399   FieldAllocationType update(bool is_static, BasicType type) {
1400     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1401     if (atype != BAD_ALLOCATION_TYPE) {
1402       // Make sure there is no overflow with injected fields.
1403       assert(count[atype] < 0xFFFF, "More than 65535 fields");
1404       count[atype]++;
1405     }
1406     return atype;
1407   }
1408 };
1409 
1410 // Side-effects: populates the _fields, _fields_annotations,
1411 // _fields_type_annotations fields
1412 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1413                                    bool is_interface,
1414                                    FieldAllocationCount* const fac,
1415                                    ConstantPool* cp,
1416                                    const int cp_size,
1417                                    u2* const java_fields_count_ptr,
1418                                    TRAPS) {
1419 
1420   assert(cfs != NULL, "invariant");
1421   assert(fac != NULL, "invariant");
1422   assert(cp != NULL, "invariant");
1423   assert(java_fields_count_ptr != NULL, "invariant");
1424 
1425   assert(NULL == _fields, "invariant");
1426   assert(NULL == _fields_annotations, "invariant");
1427   assert(NULL == _fields_type_annotations, "invariant");
1428 
1429   cfs->guarantee_more(2, CHECK);  // length
1430   const u2 length = cfs->get_u2_fast();
1431   *java_fields_count_ptr = length;
1432 
1433   int num_injected = 0;
1434   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1435                                                                   &num_injected);
1436   const int total_fields = length + num_injected;
1437 
1438   // The field array starts with tuples of shorts
1439   // [access, name index, sig index, initial value index, byte offset].
1440   // A generic signature slot only exists for field with generic
1441   // signature attribute. And the access flag is set with
1442   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1443   // signature slots are at the end of the field array and after all
1444   // other fields data.
1445   //
1446   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1447   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1448   //       ...
1449   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1450   //       [generic signature index]
1451   //       [generic signature index]
1452   //       ...
1453   //
1454   // Allocate a temporary resource array for field data. For each field,
1455   // a slot is reserved in the temporary array for the generic signature
1456   // index. After parsing all fields, the data are copied to a permanent
1457   // array and any unused slots will be discarded.
1458   ResourceMark rm(THREAD);
1459   u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1460                                               u2,
1461                                               total_fields * (FieldInfo::field_slots + 1));
1462 
1463   // The generic signature slots start after all other fields' data.
1464   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1465   int num_generic_signature = 0;
1466   for (int n = 0; n < length; n++) {
1467     // access_flags, name_index, descriptor_index, attributes_count
1468     cfs->guarantee_more(8, CHECK);
1469 
1470     AccessFlags access_flags;
1471     const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1472     verify_legal_field_modifiers(flags, is_interface, CHECK);
1473     access_flags.set_flags(flags);
1474 
1475     const u2 name_index = cfs->get_u2_fast();
1476     check_property(valid_symbol_at(name_index),
1477       "Invalid constant pool index %u for field name in class file %s",
1478       name_index, CHECK);
1479     const Symbol* const name = cp->symbol_at(name_index);
1480     verify_legal_field_name(name, CHECK);
1481 
1482     const u2 signature_index = cfs->get_u2_fast();
1483     check_property(valid_symbol_at(signature_index),
1484       "Invalid constant pool index %u for field signature in class file %s",
1485       signature_index, CHECK);
1486     const Symbol* const sig = cp->symbol_at(signature_index);
1487     verify_legal_field_signature(name, sig, CHECK);
1488 
1489     u2 constantvalue_index = 0;
1490     bool is_synthetic = false;
1491     u2 generic_signature_index = 0;
1492     const bool is_static = access_flags.is_static();
1493     FieldAnnotationCollector parsed_annotations(_loader_data);
1494 
1495     const u2 attributes_count = cfs->get_u2_fast();
1496     if (attributes_count > 0) {
1497       parse_field_attributes(cfs,
1498                              attributes_count,
1499                              is_static,
1500                              signature_index,
1501                              &constantvalue_index,
1502                              &is_synthetic,
1503                              &generic_signature_index,
1504                              &parsed_annotations,
1505                              CHECK);
1506 
1507       if (parsed_annotations.field_annotations() != NULL) {
1508         if (_fields_annotations == NULL) {
1509           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1510                                              _loader_data, length, NULL,
1511                                              CHECK);
1512         }
1513         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1514         parsed_annotations.set_field_annotations(NULL);
1515       }
1516       if (parsed_annotations.field_type_annotations() != NULL) {
1517         if (_fields_type_annotations == NULL) {
1518           _fields_type_annotations =
1519             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1520                                                          length,
1521                                                          NULL,
1522                                                          CHECK);
1523         }
1524         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1525         parsed_annotations.set_field_type_annotations(NULL);
1526       }
1527 
1528       if (is_synthetic) {
1529         access_flags.set_is_synthetic();
1530       }
1531       if (generic_signature_index != 0) {
1532         access_flags.set_field_has_generic_signature();
1533         fa[generic_signature_slot] = generic_signature_index;
1534         generic_signature_slot ++;
1535         num_generic_signature ++;
1536       }
1537     }
1538 
1539     FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1540     field->initialize(access_flags.as_short(),
1541                       name_index,
1542                       signature_index,
1543                       constantvalue_index);
1544     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1545 
1546     // Remember how many oops we encountered and compute allocation type
1547     const FieldAllocationType atype = fac->update(is_static, type);
1548     field->set_allocation_type(atype);
1549 
1550     // After field is initialized with type, we can augment it with aux info
1551     if (parsed_annotations.has_any_annotations())
1552       parsed_annotations.apply_to(field);
1553   }
1554 
1555   int index = length;
1556   if (num_injected != 0) {
1557     for (int n = 0; n < num_injected; n++) {
1558       // Check for duplicates
1559       if (injected[n].may_be_java) {
1560         const Symbol* const name      = injected[n].name();
1561         const Symbol* const signature = injected[n].signature();
1562         bool duplicate = false;
1563         for (int i = 0; i < length; i++) {
1564           const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1565           if (name      == cp->symbol_at(f->name_index()) &&
1566               signature == cp->symbol_at(f->signature_index())) {
1567             // Symbol is desclared in Java so skip this one
1568             duplicate = true;
1569             break;
1570           }
1571         }
1572         if (duplicate) {
1573           // These will be removed from the field array at the end
1574           continue;
1575         }
1576       }
1577 
1578       // Injected field
1579       FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1580       field->initialize(JVM_ACC_FIELD_INTERNAL,
1581                         injected[n].name_index,
1582                         injected[n].signature_index,
1583                         0);
1584 
1585       const BasicType type = FieldType::basic_type(injected[n].signature());
1586 
1587       // Remember how many oops we encountered and compute allocation type
1588       const FieldAllocationType atype = fac->update(false, type);
1589       field->set_allocation_type(atype);
1590       index++;
1591     }
1592   }
1593 
1594   assert(NULL == _fields, "invariant");
1595 
1596   _fields =
1597     MetadataFactory::new_array<u2>(_loader_data,
1598                                    index * FieldInfo::field_slots + num_generic_signature,
1599                                    CHECK);
1600   // Sometimes injected fields already exist in the Java source so
1601   // the fields array could be too long.  In that case the
1602   // fields array is trimed. Also unused slots that were reserved
1603   // for generic signature indexes are discarded.
1604   {
1605     int i = 0;
1606     for (; i < index * FieldInfo::field_slots; i++) {
1607       _fields->at_put(i, fa[i]);
1608     }
1609     for (int j = total_fields * FieldInfo::field_slots;
1610          j < generic_signature_slot; j++) {
1611       _fields->at_put(i++, fa[j]);
1612     }
1613     assert(_fields->length() == i, "");
1614   }
1615 
1616   if (_need_verify && length > 1) {
1617     // Check duplicated fields
1618     ResourceMark rm(THREAD);
1619     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1620       THREAD, NameSigHash*, HASH_ROW_SIZE);
1621     initialize_hashtable(names_and_sigs);
1622     bool dup = false;
1623     {
1624       debug_only(NoSafepointVerifier nsv;)
1625       for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1626         const Symbol* const name = fs.name();
1627         const Symbol* const sig = fs.signature();
1628         // If no duplicates, add name/signature in hashtable names_and_sigs.
1629         if (!put_after_lookup(name, sig, names_and_sigs)) {
1630           dup = true;
1631           break;
1632         }
1633       }
1634     }
1635     if (dup) {
1636       classfile_parse_error("Duplicate field name&signature in class file %s",
1637                             CHECK);
1638     }
1639   }
1640 }
1641 
1642 
1643 static void copy_u2_with_conversion(u2* dest, const u2* src, int length) {
1644   while (length-- > 0) {
1645     *dest++ = Bytes::get_Java_u2((u1*) (src++));
1646   }
1647 }
1648 
1649 const u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1650                                                  u4 code_length,
1651                                                  u4 exception_table_length,
1652                                                  TRAPS) {
1653   assert(cfs != NULL, "invariant");
1654 
1655   const u2* const exception_table_start = cfs->get_u2_buffer();
1656   assert(exception_table_start != NULL, "null exception table");
1657 
1658   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1659                                                                // end_pc,
1660                                                                // handler_pc,
1661                                                                // catch_type_index
1662 
1663   // Will check legal target after parsing code array in verifier.
1664   if (_need_verify) {
1665     for (unsigned int i = 0; i < exception_table_length; i++) {
1666       const u2 start_pc = cfs->get_u2_fast();
1667       const u2 end_pc = cfs->get_u2_fast();
1668       const u2 handler_pc = cfs->get_u2_fast();
1669       const u2 catch_type_index = cfs->get_u2_fast();
1670       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1671                          "Illegal exception table range in class file %s",
1672                          CHECK_NULL);
1673       guarantee_property(handler_pc < code_length,
1674                          "Illegal exception table handler in class file %s",
1675                          CHECK_NULL);
1676       if (catch_type_index != 0) {
1677         guarantee_property(valid_klass_reference_at(catch_type_index),
1678                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1679       }
1680     }
1681   } else {
1682     cfs->skip_u2_fast(exception_table_length * 4);
1683   }
1684   return exception_table_start;
1685 }
1686 
1687 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1688                                              u4 code_length,
1689                                              CompressedLineNumberWriteStream**const write_stream,
1690                                              TRAPS) {
1691 
1692   const ClassFileStream* const cfs = _stream;
1693   unsigned int num_entries = cfs->get_u2(CHECK);
1694 
1695   // Each entry is a u2 start_pc, and a u2 line_number
1696   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1697 
1698   // Verify line number attribute and table length
1699   check_property(
1700     code_attribute_length == sizeof(u2) + length_in_bytes,
1701     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1702 
1703   cfs->guarantee_more(length_in_bytes, CHECK);
1704 
1705   if ((*write_stream) == NULL) {
1706     if (length_in_bytes > fixed_buffer_size) {
1707       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1708     } else {
1709       (*write_stream) = new CompressedLineNumberWriteStream(
1710         _linenumbertable_buffer, fixed_buffer_size);
1711     }
1712   }
1713 
1714   while (num_entries-- > 0) {
1715     const u2 bci  = cfs->get_u2_fast(); // start_pc
1716     const u2 line = cfs->get_u2_fast(); // line_number
1717     guarantee_property(bci < code_length,
1718         "Invalid pc in LineNumberTable in class file %s", CHECK);
1719     (*write_stream)->write_pair(bci, line);
1720   }
1721 }
1722 
1723 
1724 class LVT_Hash : public AllStatic {
1725  public:
1726 
1727   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1728   /*
1729    * 3-tuple start_bci/length/slot has to be unique key,
1730    * so the following comparison seems to be redundant:
1731    *       && elem->name_cp_index == entry->_elem->name_cp_index
1732    */
1733     return (e0.start_bci     == e1.start_bci &&
1734             e0.length        == e1.length &&
1735             e0.name_cp_index == e1.name_cp_index &&
1736             e0.slot          == e1.slot);
1737   }
1738 
1739   static unsigned int hash(LocalVariableTableElement const& e0) {
1740     unsigned int raw_hash = e0.start_bci;
1741 
1742     raw_hash = e0.length        + raw_hash * 37;
1743     raw_hash = e0.name_cp_index + raw_hash * 37;
1744     raw_hash = e0.slot          + raw_hash * 37;
1745 
1746     return raw_hash;
1747   }
1748 };
1749 
1750 
1751 // Class file LocalVariableTable elements.
1752 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1753  public:
1754   u2 start_bci;
1755   u2 length;
1756   u2 name_cp_index;
1757   u2 descriptor_cp_index;
1758   u2 slot;
1759 };
1760 
1761 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1762                              LocalVariableTableElement* const lvt) {
1763   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1764   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1765   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1766   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1767   lvt->signature_cp_index  = 0;
1768   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1769 }
1770 
1771 // Function is used to parse both attributes:
1772 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1773 const u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1774                                                      u4 code_length,
1775                                                      u2 max_locals,
1776                                                      u4 code_attribute_length,
1777                                                      u2* const localvariable_table_length,
1778                                                      bool isLVTT,
1779                                                      TRAPS) {
1780   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1781   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1782   const unsigned int size =
1783     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1784 
1785   const ConstantPool* const cp = _cp;
1786 
1787   // Verify local variable table attribute has right length
1788   if (_need_verify) {
1789     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1790                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1791   }
1792 
1793   const u2* const localvariable_table_start = cfs->get_u2_buffer();
1794   assert(localvariable_table_start != NULL, "null local variable table");
1795   if (!_need_verify) {
1796     cfs->skip_u2_fast(size);
1797   } else {
1798     cfs->guarantee_more(size * 2, CHECK_NULL);
1799     for(int i = 0; i < (*localvariable_table_length); i++) {
1800       const u2 start_pc = cfs->get_u2_fast();
1801       const u2 length = cfs->get_u2_fast();
1802       const u2 name_index = cfs->get_u2_fast();
1803       const u2 descriptor_index = cfs->get_u2_fast();
1804       const u2 index = cfs->get_u2_fast();
1805       // Assign to a u4 to avoid overflow
1806       const u4 end_pc = (u4)start_pc + (u4)length;
1807 
1808       if (start_pc >= code_length) {
1809         classfile_parse_error(
1810           "Invalid start_pc %u in %s in class file %s",
1811           start_pc, tbl_name, CHECK_NULL);
1812       }
1813       if (end_pc > code_length) {
1814         classfile_parse_error(
1815           "Invalid length %u in %s in class file %s",
1816           length, tbl_name, CHECK_NULL);
1817       }
1818       const int cp_size = cp->length();
1819       guarantee_property(valid_symbol_at(name_index),
1820         "Name index %u in %s has bad constant type in class file %s",
1821         name_index, tbl_name, CHECK_NULL);
1822       guarantee_property(valid_symbol_at(descriptor_index),
1823         "Signature index %u in %s has bad constant type in class file %s",
1824         descriptor_index, tbl_name, CHECK_NULL);
1825 
1826       const Symbol* const name = cp->symbol_at(name_index);
1827       const Symbol* const sig = cp->symbol_at(descriptor_index);
1828       verify_legal_field_name(name, CHECK_NULL);
1829       u2 extra_slot = 0;
1830       if (!isLVTT) {
1831         verify_legal_field_signature(name, sig, CHECK_NULL);
1832 
1833         // 4894874: check special cases for double and long local variables
1834         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1835             sig == vmSymbols::type_signature(T_LONG)) {
1836           extra_slot = 1;
1837         }
1838       }
1839       guarantee_property((index + extra_slot) < max_locals,
1840                           "Invalid index %u in %s in class file %s",
1841                           index, tbl_name, CHECK_NULL);
1842     }
1843   }
1844   return localvariable_table_start;
1845 }
1846 
1847 
1848 void ClassFileParser::parse_type_array(u2 array_length,
1849                                        u4 code_length,
1850                                        u4* const u1_index,
1851                                        u4* const u2_index,
1852                                        u1* const u1_array,
1853                                        u2* const u2_array,
1854                                        TRAPS) {
1855   const ClassFileStream* const cfs = _stream;
1856   u2 index = 0; // index in the array with long/double occupying two slots
1857   u4 i1 = *u1_index;
1858   u4 i2 = *u2_index + 1;
1859   for(int i = 0; i < array_length; i++) {
1860     const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1861     index++;
1862     if (tag == ITEM_Long || tag == ITEM_Double) {
1863       index++;
1864     } else if (tag == ITEM_Object) {
1865       const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1866       guarantee_property(valid_klass_reference_at(class_index),
1867                          "Bad class index %u in StackMap in class file %s",
1868                          class_index, CHECK);
1869     } else if (tag == ITEM_Uninitialized) {
1870       const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1871       guarantee_property(
1872         offset < code_length,
1873         "Bad uninitialized type offset %u in StackMap in class file %s",
1874         offset, CHECK);
1875     } else {
1876       guarantee_property(
1877         tag <= (u1)ITEM_Uninitialized,
1878         "Unknown variable type %u in StackMap in class file %s",
1879         tag, CHECK);
1880     }
1881   }
1882   u2_array[*u2_index] = index;
1883   *u1_index = i1;
1884   *u2_index = i2;
1885 }
1886 
1887 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1888                                       u4 code_attribute_length,
1889                                       bool need_verify,
1890                                       TRAPS) {
1891   assert(cfs != NULL, "invariant");
1892 
1893   if (0 == code_attribute_length) {
1894     return NULL;
1895   }
1896 
1897   const u1* const stackmap_table_start = cfs->get_u1_buffer();
1898   assert(stackmap_table_start != NULL, "null stackmap table");
1899 
1900   // check code_attribute_length first
1901   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1902 
1903   if (!need_verify && !DumpSharedSpaces) {
1904     return NULL;
1905   }
1906   return stackmap_table_start;
1907 }
1908 
1909 const u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1910                                                     u2* const checked_exceptions_length,
1911                                                     u4 method_attribute_length,
1912                                                     TRAPS) {
1913   assert(cfs != NULL, "invariant");
1914   assert(checked_exceptions_length != NULL, "invariant");
1915 
1916   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1917   *checked_exceptions_length = cfs->get_u2_fast();
1918   const unsigned int size =
1919     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1920   const u2* const checked_exceptions_start = cfs->get_u2_buffer();
1921   assert(checked_exceptions_start != NULL, "null checked exceptions");
1922   if (!_need_verify) {
1923     cfs->skip_u2_fast(size);
1924   } else {
1925     // Verify each value in the checked exception table
1926     u2 checked_exception;
1927     const u2 len = *checked_exceptions_length;
1928     cfs->guarantee_more(2 * len, CHECK_NULL);
1929     for (int i = 0; i < len; i++) {
1930       checked_exception = cfs->get_u2_fast();
1931       check_property(
1932         valid_klass_reference_at(checked_exception),
1933         "Exception name has bad type at constant pool %u in class file %s",
1934         checked_exception, CHECK_NULL);
1935     }
1936   }
1937   // check exceptions attribute length
1938   if (_need_verify) {
1939     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1940                                                    sizeof(u2) * size),
1941                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1942   }
1943   return checked_exceptions_start;
1944 }
1945 
1946 void ClassFileParser::throwIllegalSignature(const char* type,
1947                                             const Symbol* name,
1948                                             const Symbol* sig,
1949                                             TRAPS) const {
1950   assert(name != NULL, "invariant");
1951   assert(sig != NULL, "invariant");
1952 
1953   ResourceMark rm(THREAD);
1954   Exceptions::fthrow(THREAD_AND_LOCATION,
1955       vmSymbols::java_lang_ClassFormatError(),
1956       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1957       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1958 }
1959 
1960 AnnotationCollector::ID
1961 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1962                                       const Symbol* name) {
1963   const vmSymbols::SID sid = vmSymbols::find_sid(name);
1964   // Privileged code can use all annotations.  Other code silently drops some.
1965   const bool privileged = loader_data->is_the_null_class_loader_data() ||
1966                           loader_data->is_platform_class_loader_data() ||
1967                           loader_data->is_anonymous();
1968   switch (sid) {
1969     case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1970       if (_location != _in_method)  break;  // only allow for methods
1971       if (!privileged)              break;  // only allow in privileged code
1972       return _method_CallerSensitive;
1973     }
1974     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1975       if (_location != _in_method)  break;  // only allow for methods
1976       if (!privileged)              break;  // only allow in privileged code
1977       return _method_ForceInline;
1978     }
1979     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1980       if (_location != _in_method)  break;  // only allow for methods
1981       if (!privileged)              break;  // only allow in privileged code
1982       return _method_DontInline;
1983     }
1984     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1985       if (_location != _in_method)  break;  // only allow for methods
1986       if (!privileged)              break;  // only allow in privileged code
1987       return _method_InjectedProfile;
1988     }
1989     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1990       if (_location != _in_method)  break;  // only allow for methods
1991       if (!privileged)              break;  // only allow in privileged code
1992       return _method_LambdaForm_Compiled;
1993     }
1994     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
1995       if (_location != _in_method)  break;  // only allow for methods
1996       if (!privileged)              break;  // only allow in privileged code
1997       return _method_LambdaForm_Hidden;
1998     }
1999     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
2000       if (_location != _in_method)  break;  // only allow for methods
2001       if (!privileged)              break;  // only allow in privileged code
2002       return _method_HotSpotIntrinsicCandidate;
2003     }
2004     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2005       if (_location != _in_field)   break;  // only allow for fields
2006       if (!privileged)              break;  // only allow in privileged code
2007       return _field_Stable;
2008     }
2009     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2010       if (_location != _in_field && _location != _in_class) {
2011         break;  // only allow for fields and classes
2012       }
2013       if (!EnableContended || (RestrictContended && !privileged)) {
2014         break;  // honor privileges
2015       }
2016       return _jdk_internal_vm_annotation_Contended;
2017     }
2018     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2019       if (_location != _in_method)  break;  // only allow for methods
2020       if (RestrictReservedStack && !privileged) break; // honor privileges
2021       return _jdk_internal_vm_annotation_ReservedStackAccess;
2022     }
2023     default: {
2024       break;
2025     }
2026   }
2027   return AnnotationCollector::_unknown;
2028 }
2029 
2030 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2031   if (is_contended())
2032     f->set_contended_group(contended_group());
2033   if (is_stable())
2034     f->set_stable(true);
2035 }
2036 
2037 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2038   // If there's an error deallocate metadata for field annotations
2039   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2040   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2041 }
2042 
2043 void MethodAnnotationCollector::apply_to(methodHandle m) {
2044   if (has_annotation(_method_CallerSensitive))
2045     m->set_caller_sensitive(true);
2046   if (has_annotation(_method_ForceInline))
2047     m->set_force_inline(true);
2048   if (has_annotation(_method_DontInline))
2049     m->set_dont_inline(true);
2050   if (has_annotation(_method_InjectedProfile))
2051     m->set_has_injected_profile(true);
2052   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2053     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2054   if (has_annotation(_method_LambdaForm_Hidden))
2055     m->set_hidden(true);
2056   if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2057     m->set_intrinsic_candidate(true);
2058   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2059     m->set_has_reserved_stack_access(true);
2060 }
2061 
2062 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2063   assert(ik != NULL, "invariant");
2064   ik->set_is_contended(is_contended());
2065 }
2066 
2067 #define MAX_ARGS_SIZE 255
2068 #define MAX_CODE_SIZE 65535
2069 #define INITIAL_MAX_LVT_NUMBER 256
2070 
2071 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2072  *
2073  * Rules for LVT's and LVTT's are:
2074  *   - There can be any number of LVT's and LVTT's.
2075  *   - If there are n LVT's, it is the same as if there was just
2076  *     one LVT containing all the entries from the n LVT's.
2077  *   - There may be no more than one LVT entry per local variable.
2078  *     Two LVT entries are 'equal' if these fields are the same:
2079  *        start_pc, length, name, slot
2080  *   - There may be no more than one LVTT entry per each LVT entry.
2081  *     Each LVTT entry has to match some LVT entry.
2082  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2083  */
2084 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2085                                                int lvt_cnt,
2086                                                u2* const localvariable_table_length,
2087                                                const u2**const localvariable_table_start,
2088                                                int lvtt_cnt,
2089                                                u2* const localvariable_type_table_length,
2090                                                const u2**const localvariable_type_table_start,
2091                                                TRAPS) {
2092 
2093   ResourceMark rm(THREAD);
2094 
2095   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2096                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2097 
2098   LVT_HashTable* const table = new LVT_HashTable();
2099 
2100   // To fill LocalVariableTable in
2101   const Classfile_LVT_Element* cf_lvt;
2102   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2103 
2104   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2105     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2106     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2107       copy_lvt_element(&cf_lvt[idx], lvt);
2108       // If no duplicates, add LVT elem in hashtable.
2109       if (table->put(*lvt, lvt) == false
2110           && _need_verify
2111           && _major_version >= JAVA_1_5_VERSION) {
2112         classfile_parse_error("Duplicated LocalVariableTable attribute "
2113                               "entry for '%s' in class file %s",
2114                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2115                                CHECK);
2116       }
2117     }
2118   }
2119 
2120   // To merge LocalVariableTable and LocalVariableTypeTable
2121   const Classfile_LVT_Element* cf_lvtt;
2122   LocalVariableTableElement lvtt_elem;
2123 
2124   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2125     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2126     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2127       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2128       LocalVariableTableElement** entry = table->get(lvtt_elem);
2129       if (entry == NULL) {
2130         if (_need_verify) {
2131           classfile_parse_error("LVTT entry for '%s' in class file %s "
2132                                 "does not match any LVT entry",
2133                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2134                                  CHECK);
2135         }
2136       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2137         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2138                               "entry for '%s' in class file %s",
2139                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2140                                CHECK);
2141       } else {
2142         // to add generic signatures into LocalVariableTable
2143         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2144       }
2145     }
2146   }
2147 }
2148 
2149 
2150 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2151                                        const u1* runtime_visible_annotations,
2152                                        int runtime_visible_annotations_length,
2153                                        const u1* runtime_invisible_annotations,
2154                                        int runtime_invisible_annotations_length,
2155                                        const u1* runtime_visible_parameter_annotations,
2156                                        int runtime_visible_parameter_annotations_length,
2157                                        const u1* runtime_invisible_parameter_annotations,
2158                                        int runtime_invisible_parameter_annotations_length,
2159                                        const u1* runtime_visible_type_annotations,
2160                                        int runtime_visible_type_annotations_length,
2161                                        const u1* runtime_invisible_type_annotations,
2162                                        int runtime_invisible_type_annotations_length,
2163                                        const u1* annotation_default,
2164                                        int annotation_default_length,
2165                                        TRAPS) {
2166 
2167   AnnotationArray* a;
2168 
2169   if (runtime_visible_annotations_length +
2170       runtime_invisible_annotations_length > 0) {
2171      a = assemble_annotations(runtime_visible_annotations,
2172                               runtime_visible_annotations_length,
2173                               runtime_invisible_annotations,
2174                               runtime_invisible_annotations_length,
2175                               CHECK);
2176      cm->set_method_annotations(a);
2177   }
2178 
2179   if (runtime_visible_parameter_annotations_length +
2180       runtime_invisible_parameter_annotations_length > 0) {
2181     a = assemble_annotations(runtime_visible_parameter_annotations,
2182                              runtime_visible_parameter_annotations_length,
2183                              runtime_invisible_parameter_annotations,
2184                              runtime_invisible_parameter_annotations_length,
2185                              CHECK);
2186     cm->set_parameter_annotations(a);
2187   }
2188 
2189   if (annotation_default_length > 0) {
2190     a = assemble_annotations(annotation_default,
2191                              annotation_default_length,
2192                              NULL,
2193                              0,
2194                              CHECK);
2195     cm->set_default_annotations(a);
2196   }
2197 
2198   if (runtime_visible_type_annotations_length +
2199       runtime_invisible_type_annotations_length > 0) {
2200     a = assemble_annotations(runtime_visible_type_annotations,
2201                              runtime_visible_type_annotations_length,
2202                              runtime_invisible_type_annotations,
2203                              runtime_invisible_type_annotations_length,
2204                              CHECK);
2205     cm->set_type_annotations(a);
2206   }
2207 }
2208 
2209 
2210 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2211 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2212 // Method* to save footprint, so we only know the size of the resulting Method* when the
2213 // entire method attribute is parsed.
2214 //
2215 // The promoted_flags parameter is used to pass relevant access_flags
2216 // from the method back up to the containing klass. These flag values
2217 // are added to klass's access_flags.
2218 
2219 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2220                                       bool is_interface,
2221                                       const ConstantPool* cp,
2222                                       AccessFlags* const promoted_flags,
2223                                       TRAPS) {
2224   assert(cfs != NULL, "invariant");
2225   assert(cp != NULL, "invariant");
2226   assert(promoted_flags != NULL, "invariant");
2227 
2228   ResourceMark rm(THREAD);
2229   // Parse fixed parts:
2230   // access_flags, name_index, descriptor_index, attributes_count
2231   cfs->guarantee_more(8, CHECK_NULL);
2232 
2233   int flags = cfs->get_u2_fast();
2234   const u2 name_index = cfs->get_u2_fast();
2235   const int cp_size = cp->length();
2236   check_property(
2237     valid_symbol_at(name_index),
2238     "Illegal constant pool index %u for method name in class file %s",
2239     name_index, CHECK_NULL);
2240   const Symbol* const name = cp->symbol_at(name_index);
2241   verify_legal_method_name(name, CHECK_NULL);
2242 
2243   const u2 signature_index = cfs->get_u2_fast();
2244   guarantee_property(
2245     valid_symbol_at(signature_index),
2246     "Illegal constant pool index %u for method signature in class file %s",
2247     signature_index, CHECK_NULL);
2248   const Symbol* const signature = cp->symbol_at(signature_index);
2249 
2250   if (name == vmSymbols::class_initializer_name()) {
2251     // We ignore the other access flags for a valid class initializer.
2252     // (JVM Spec 2nd ed., chapter 4.6)
2253     if (_major_version < 51) { // backward compatibility
2254       flags = JVM_ACC_STATIC;
2255     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2256       flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2257     } else {
2258       classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2259     }
2260   } else {
2261     verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2262   }
2263 
2264   if (name == vmSymbols::object_initializer_name() && is_interface) {
2265     classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2266   }
2267 
2268   int args_size = -1;  // only used when _need_verify is true
2269   if (_need_verify) {
2270     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2271                  verify_legal_method_signature(name, signature, CHECK_NULL);
2272     if (args_size > MAX_ARGS_SIZE) {
2273       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2274     }
2275   }
2276 
2277   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2278 
2279   // Default values for code and exceptions attribute elements
2280   u2 max_stack = 0;
2281   u2 max_locals = 0;
2282   u4 code_length = 0;
2283   const u1* code_start = 0;
2284   u2 exception_table_length = 0;
2285   const u2* exception_table_start = NULL;
2286   Array<int>* exception_handlers = Universe::the_empty_int_array();
2287   u2 checked_exceptions_length = 0;
2288   const u2* checked_exceptions_start = NULL;
2289   CompressedLineNumberWriteStream* linenumber_table = NULL;
2290   int linenumber_table_length = 0;
2291   int total_lvt_length = 0;
2292   u2 lvt_cnt = 0;
2293   u2 lvtt_cnt = 0;
2294   bool lvt_allocated = false;
2295   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2296   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2297   u2* localvariable_table_length = NULL;
2298   const u2** localvariable_table_start = NULL;
2299   u2* localvariable_type_table_length = NULL;
2300   const u2** localvariable_type_table_start = NULL;
2301   int method_parameters_length = -1;
2302   const u1* method_parameters_data = NULL;
2303   bool method_parameters_seen = false;
2304   bool parsed_code_attribute = false;
2305   bool parsed_checked_exceptions_attribute = false;
2306   bool parsed_stackmap_attribute = false;
2307   // stackmap attribute - JDK1.5
2308   const u1* stackmap_data = NULL;
2309   int stackmap_data_length = 0;
2310   u2 generic_signature_index = 0;
2311   MethodAnnotationCollector parsed_annotations;
2312   const u1* runtime_visible_annotations = NULL;
2313   int runtime_visible_annotations_length = 0;
2314   const u1* runtime_invisible_annotations = NULL;
2315   int runtime_invisible_annotations_length = 0;
2316   const u1* runtime_visible_parameter_annotations = NULL;
2317   int runtime_visible_parameter_annotations_length = 0;
2318   const u1* runtime_invisible_parameter_annotations = NULL;
2319   int runtime_invisible_parameter_annotations_length = 0;
2320   const u1* runtime_visible_type_annotations = NULL;
2321   int runtime_visible_type_annotations_length = 0;
2322   const u1* runtime_invisible_type_annotations = NULL;
2323   int runtime_invisible_type_annotations_length = 0;
2324   bool runtime_invisible_annotations_exists = false;
2325   bool runtime_invisible_type_annotations_exists = false;
2326   bool runtime_invisible_parameter_annotations_exists = false;
2327   const u1* annotation_default = NULL;
2328   int annotation_default_length = 0;
2329 
2330   // Parse code and exceptions attribute
2331   u2 method_attributes_count = cfs->get_u2_fast();
2332   while (method_attributes_count--) {
2333     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2334     const u2 method_attribute_name_index = cfs->get_u2_fast();
2335     const u4 method_attribute_length = cfs->get_u4_fast();
2336     check_property(
2337       valid_symbol_at(method_attribute_name_index),
2338       "Invalid method attribute name index %u in class file %s",
2339       method_attribute_name_index, CHECK_NULL);
2340 
2341     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2342     if (method_attribute_name == vmSymbols::tag_code()) {
2343       // Parse Code attribute
2344       if (_need_verify) {
2345         guarantee_property(
2346             !access_flags.is_native() && !access_flags.is_abstract(),
2347                         "Code attribute in native or abstract methods in class file %s",
2348                          CHECK_NULL);
2349       }
2350       if (parsed_code_attribute) {
2351         classfile_parse_error("Multiple Code attributes in class file %s",
2352                               CHECK_NULL);
2353       }
2354       parsed_code_attribute = true;
2355 
2356       // Stack size, locals size, and code size
2357       if (_major_version == 45 && _minor_version <= 2) {
2358         cfs->guarantee_more(4, CHECK_NULL);
2359         max_stack = cfs->get_u1_fast();
2360         max_locals = cfs->get_u1_fast();
2361         code_length = cfs->get_u2_fast();
2362       } else {
2363         cfs->guarantee_more(8, CHECK_NULL);
2364         max_stack = cfs->get_u2_fast();
2365         max_locals = cfs->get_u2_fast();
2366         code_length = cfs->get_u4_fast();
2367       }
2368       if (_need_verify) {
2369         guarantee_property(args_size <= max_locals,
2370                            "Arguments can't fit into locals in class file %s",
2371                            CHECK_NULL);
2372         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2373                            "Invalid method Code length %u in class file %s",
2374                            code_length, CHECK_NULL);
2375       }
2376       // Code pointer
2377       code_start = cfs->get_u1_buffer();
2378       assert(code_start != NULL, "null code start");
2379       cfs->guarantee_more(code_length, CHECK_NULL);
2380       cfs->skip_u1_fast(code_length);
2381 
2382       // Exception handler table
2383       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2384       exception_table_length = cfs->get_u2_fast();
2385       if (exception_table_length > 0) {
2386         exception_table_start = parse_exception_table(cfs,
2387                                                       code_length,
2388                                                       exception_table_length,
2389                                                       CHECK_NULL);
2390       }
2391 
2392       // Parse additional attributes in code attribute
2393       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2394       u2 code_attributes_count = cfs->get_u2_fast();
2395 
2396       unsigned int calculated_attribute_length = 0;
2397 
2398       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2399         calculated_attribute_length =
2400             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2401       } else {
2402         // max_stack, locals and length are smaller in pre-version 45.2 classes
2403         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2404       }
2405       calculated_attribute_length +=
2406         code_length +
2407         sizeof(exception_table_length) +
2408         sizeof(code_attributes_count) +
2409         exception_table_length *
2410             ( sizeof(u2) +   // start_pc
2411               sizeof(u2) +   // end_pc
2412               sizeof(u2) +   // handler_pc
2413               sizeof(u2) );  // catch_type_index
2414 
2415       while (code_attributes_count--) {
2416         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2417         const u2 code_attribute_name_index = cfs->get_u2_fast();
2418         const u4 code_attribute_length = cfs->get_u4_fast();
2419         calculated_attribute_length += code_attribute_length +
2420                                        sizeof(code_attribute_name_index) +
2421                                        sizeof(code_attribute_length);
2422         check_property(valid_symbol_at(code_attribute_name_index),
2423                        "Invalid code attribute name index %u in class file %s",
2424                        code_attribute_name_index,
2425                        CHECK_NULL);
2426         if (LoadLineNumberTables &&
2427             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2428           // Parse and compress line number table
2429           parse_linenumber_table(code_attribute_length,
2430                                  code_length,
2431                                  &linenumber_table,
2432                                  CHECK_NULL);
2433 
2434         } else if (LoadLocalVariableTables &&
2435                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2436           // Parse local variable table
2437           if (!lvt_allocated) {
2438             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2439               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2440             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2441               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2442             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2443               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2444             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2445               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2446             lvt_allocated = true;
2447           }
2448           if (lvt_cnt == max_lvt_cnt) {
2449             max_lvt_cnt <<= 1;
2450             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2451             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2452           }
2453           localvariable_table_start[lvt_cnt] =
2454             parse_localvariable_table(cfs,
2455                                       code_length,
2456                                       max_locals,
2457                                       code_attribute_length,
2458                                       &localvariable_table_length[lvt_cnt],
2459                                       false,    // is not LVTT
2460                                       CHECK_NULL);
2461           total_lvt_length += localvariable_table_length[lvt_cnt];
2462           lvt_cnt++;
2463         } else if (LoadLocalVariableTypeTables &&
2464                    _major_version >= JAVA_1_5_VERSION &&
2465                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2466           if (!lvt_allocated) {
2467             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2468               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2469             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2470               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2471             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2472               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2473             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2474               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2475             lvt_allocated = true;
2476           }
2477           // Parse local variable type table
2478           if (lvtt_cnt == max_lvtt_cnt) {
2479             max_lvtt_cnt <<= 1;
2480             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2481             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2482           }
2483           localvariable_type_table_start[lvtt_cnt] =
2484             parse_localvariable_table(cfs,
2485                                       code_length,
2486                                       max_locals,
2487                                       code_attribute_length,
2488                                       &localvariable_type_table_length[lvtt_cnt],
2489                                       true,     // is LVTT
2490                                       CHECK_NULL);
2491           lvtt_cnt++;
2492         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2493                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2494           // Stack map is only needed by the new verifier in JDK1.5.
2495           if (parsed_stackmap_attribute) {
2496             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2497           }
2498           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2499           stackmap_data_length = code_attribute_length;
2500           parsed_stackmap_attribute = true;
2501         } else {
2502           // Skip unknown attributes
2503           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2504         }
2505       }
2506       // check method attribute length
2507       if (_need_verify) {
2508         guarantee_property(method_attribute_length == calculated_attribute_length,
2509                            "Code segment has wrong length in class file %s",
2510                            CHECK_NULL);
2511       }
2512     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2513       // Parse Exceptions attribute
2514       if (parsed_checked_exceptions_attribute) {
2515         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2516                               CHECK_NULL);
2517       }
2518       parsed_checked_exceptions_attribute = true;
2519       checked_exceptions_start =
2520             parse_checked_exceptions(cfs,
2521                                      &checked_exceptions_length,
2522                                      method_attribute_length,
2523                                      CHECK_NULL);
2524     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2525       // reject multiple method parameters
2526       if (method_parameters_seen) {
2527         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2528                               CHECK_NULL);
2529       }
2530       method_parameters_seen = true;
2531       method_parameters_length = cfs->get_u1_fast();
2532       const u2 real_length = (method_parameters_length * 4u) + 1u;
2533       if (method_attribute_length != real_length) {
2534         classfile_parse_error(
2535           "Invalid MethodParameters method attribute length %u in class file",
2536           method_attribute_length, CHECK_NULL);
2537       }
2538       method_parameters_data = cfs->get_u1_buffer();
2539       cfs->skip_u2_fast(method_parameters_length);
2540       cfs->skip_u2_fast(method_parameters_length);
2541       // ignore this attribute if it cannot be reflected
2542       if (!SystemDictionary::Parameter_klass_loaded())
2543         method_parameters_length = -1;
2544     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2545       if (method_attribute_length != 0) {
2546         classfile_parse_error(
2547           "Invalid Synthetic method attribute length %u in class file %s",
2548           method_attribute_length, CHECK_NULL);
2549       }
2550       // Should we check that there hasn't already been a synthetic attribute?
2551       access_flags.set_is_synthetic();
2552     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2553       if (method_attribute_length != 0) {
2554         classfile_parse_error(
2555           "Invalid Deprecated method attribute length %u in class file %s",
2556           method_attribute_length, CHECK_NULL);
2557       }
2558     } else if (_major_version >= JAVA_1_5_VERSION) {
2559       if (method_attribute_name == vmSymbols::tag_signature()) {
2560         if (method_attribute_length != 2) {
2561           classfile_parse_error(
2562             "Invalid Signature attribute length %u in class file %s",
2563             method_attribute_length, CHECK_NULL);
2564         }
2565         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2566       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2567         if (runtime_visible_annotations != NULL) {
2568           classfile_parse_error(
2569             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2570             CHECK_NULL);
2571         }
2572         runtime_visible_annotations_length = method_attribute_length;
2573         runtime_visible_annotations = cfs->get_u1_buffer();
2574         assert(runtime_visible_annotations != NULL, "null visible annotations");
2575         parse_annotations(cp,
2576                           runtime_visible_annotations,
2577                           runtime_visible_annotations_length,
2578                           &parsed_annotations,
2579                           _loader_data,
2580                           CHECK_NULL);
2581         cfs->skip_u1(runtime_visible_annotations_length, CHECK_NULL);
2582       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2583         if (runtime_invisible_annotations_exists) {
2584           classfile_parse_error(
2585             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2586             CHECK_NULL);
2587         }
2588         runtime_invisible_annotations_exists = true;
2589         if (PreserveAllAnnotations) {
2590           runtime_invisible_annotations_length = method_attribute_length;
2591           runtime_invisible_annotations = cfs->get_u1_buffer();
2592           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2593         }
2594         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2595       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2596         if (runtime_visible_parameter_annotations != NULL) {
2597           classfile_parse_error(
2598             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2599             CHECK_NULL);
2600         }
2601         runtime_visible_parameter_annotations_length = method_attribute_length;
2602         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2603         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2604         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2605       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2606         if (runtime_invisible_parameter_annotations_exists) {
2607           classfile_parse_error(
2608             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2609             CHECK_NULL);
2610         }
2611         runtime_invisible_parameter_annotations_exists = true;
2612         if (PreserveAllAnnotations) {
2613           runtime_invisible_parameter_annotations_length = method_attribute_length;
2614           runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2615           assert(runtime_invisible_parameter_annotations != NULL,
2616             "null invisible parameter annotations");
2617         }
2618         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2619       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2620         if (annotation_default != NULL) {
2621           classfile_parse_error(
2622             "Multiple AnnotationDefault attributes for method in class file %s",
2623             CHECK_NULL);
2624         }
2625         annotation_default_length = method_attribute_length;
2626         annotation_default = cfs->get_u1_buffer();
2627         assert(annotation_default != NULL, "null annotation default");
2628         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2629       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2630         if (runtime_visible_type_annotations != NULL) {
2631           classfile_parse_error(
2632             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2633             CHECK_NULL);
2634         }
2635         runtime_visible_type_annotations_length = method_attribute_length;
2636         runtime_visible_type_annotations = cfs->get_u1_buffer();
2637         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2638         // No need for the VM to parse Type annotations
2639         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2640       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2641         if (runtime_invisible_type_annotations_exists) {
2642           classfile_parse_error(
2643             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2644             CHECK_NULL);
2645         } else {
2646           runtime_invisible_type_annotations_exists = true;
2647         }
2648         if (PreserveAllAnnotations) {
2649           runtime_invisible_type_annotations_length = method_attribute_length;
2650           runtime_invisible_type_annotations = cfs->get_u1_buffer();
2651           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2652         }
2653         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2654       } else {
2655         // Skip unknown attributes
2656         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2657       }
2658     } else {
2659       // Skip unknown attributes
2660       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2661     }
2662   }
2663 
2664   if (linenumber_table != NULL) {
2665     linenumber_table->write_terminator();
2666     linenumber_table_length = linenumber_table->position();
2667   }
2668 
2669   // Make sure there's at least one Code attribute in non-native/non-abstract method
2670   if (_need_verify) {
2671     guarantee_property(access_flags.is_native() ||
2672                        access_flags.is_abstract() ||
2673                        parsed_code_attribute,
2674                        "Absent Code attribute in method that is not native or abstract in class file %s",
2675                        CHECK_NULL);
2676   }
2677 
2678   // All sizing information for a Method* is finally available, now create it
2679   InlineTableSizes sizes(
2680       total_lvt_length,
2681       linenumber_table_length,
2682       exception_table_length,
2683       checked_exceptions_length,
2684       method_parameters_length,
2685       generic_signature_index,
2686       runtime_visible_annotations_length +
2687            runtime_invisible_annotations_length,
2688       runtime_visible_parameter_annotations_length +
2689            runtime_invisible_parameter_annotations_length,
2690       runtime_visible_type_annotations_length +
2691            runtime_invisible_type_annotations_length,
2692       annotation_default_length,
2693       0);
2694 
2695   Method* const m = Method::allocate(_loader_data,
2696                                      code_length,
2697                                      access_flags,
2698                                      &sizes,
2699                                      ConstMethod::NORMAL,
2700                                      CHECK_NULL);
2701 
2702   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2703 
2704   // Fill in information from fixed part (access_flags already set)
2705   m->set_constants(_cp);
2706   m->set_name_index(name_index);
2707   m->set_signature_index(signature_index);
2708 
2709   ResultTypeFinder rtf(cp->symbol_at(signature_index));
2710   m->constMethod()->set_result_type(rtf.type());
2711 
2712   if (args_size >= 0) {
2713     m->set_size_of_parameters(args_size);
2714   } else {
2715     m->compute_size_of_parameters(THREAD);
2716   }
2717 #ifdef ASSERT
2718   if (args_size >= 0) {
2719     m->compute_size_of_parameters(THREAD);
2720     assert(args_size == m->size_of_parameters(), "");
2721   }
2722 #endif
2723 
2724   // Fill in code attribute information
2725   m->set_max_stack(max_stack);
2726   m->set_max_locals(max_locals);
2727   if (stackmap_data != NULL) {
2728     m->constMethod()->copy_stackmap_data(_loader_data,
2729                                          (u1*)stackmap_data,
2730                                          stackmap_data_length,
2731                                          CHECK_NULL);
2732   }
2733 
2734   // Copy byte codes
2735   m->set_code((u1*)code_start);
2736 
2737   // Copy line number table
2738   if (linenumber_table != NULL) {
2739     memcpy(m->compressed_linenumber_table(),
2740            linenumber_table->buffer(),
2741            linenumber_table_length);
2742   }
2743 
2744   // Copy exception table
2745   if (exception_table_length > 0) {
2746     int size =
2747       exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2748     copy_u2_with_conversion((u2*) m->exception_table_start(),
2749                             exception_table_start, size);
2750   }
2751 
2752   // Copy method parameters
2753   if (method_parameters_length > 0) {
2754     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2755     for (int i = 0; i < method_parameters_length; i++) {
2756       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2757       method_parameters_data += 2;
2758       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2759       method_parameters_data += 2;
2760     }
2761   }
2762 
2763   // Copy checked exceptions
2764   if (checked_exceptions_length > 0) {
2765     const int size =
2766       checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2767     copy_u2_with_conversion((u2*) m->checked_exceptions_start(),
2768                             checked_exceptions_start,
2769                             size);
2770   }
2771 
2772   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2773   if (total_lvt_length > 0) {
2774     promoted_flags->set_has_localvariable_table();
2775     copy_localvariable_table(m->constMethod(),
2776                              lvt_cnt,
2777                              localvariable_table_length,
2778                              localvariable_table_start,
2779                              lvtt_cnt,
2780                              localvariable_type_table_length,
2781                              localvariable_type_table_start,
2782                              CHECK_NULL);
2783   }
2784 
2785   if (parsed_annotations.has_any_annotations())
2786     parsed_annotations.apply_to(m);
2787 
2788   // Copy annotations
2789   copy_method_annotations(m->constMethod(),
2790                           runtime_visible_annotations,
2791                           runtime_visible_annotations_length,
2792                           runtime_invisible_annotations,
2793                           runtime_invisible_annotations_length,
2794                           runtime_visible_parameter_annotations,
2795                           runtime_visible_parameter_annotations_length,
2796                           runtime_invisible_parameter_annotations,
2797                           runtime_invisible_parameter_annotations_length,
2798                           runtime_visible_type_annotations,
2799                           runtime_visible_type_annotations_length,
2800                           runtime_invisible_type_annotations,
2801                           runtime_invisible_type_annotations_length,
2802                           annotation_default,
2803                           annotation_default_length,
2804                           CHECK_NULL);
2805 
2806   if (name == vmSymbols::finalize_method_name() &&
2807       signature == vmSymbols::void_method_signature()) {
2808     if (m->is_empty_method()) {
2809       _has_empty_finalizer = true;
2810     } else {
2811       _has_finalizer = true;
2812     }
2813   }
2814   if (name == vmSymbols::object_initializer_name() &&
2815       signature == vmSymbols::void_method_signature() &&
2816       m->is_vanilla_constructor()) {
2817     _has_vanilla_constructor = true;
2818   }
2819 
2820   NOT_PRODUCT(m->verify());
2821   return m;
2822 }
2823 
2824 
2825 // The promoted_flags parameter is used to pass relevant access_flags
2826 // from the methods back up to the containing klass. These flag values
2827 // are added to klass's access_flags.
2828 // Side-effects: populates the _methods field in the parser
2829 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2830                                     bool is_interface,
2831                                     AccessFlags* promoted_flags,
2832                                     bool* has_final_method,
2833                                     bool* declares_nonstatic_concrete_methods,
2834                                     TRAPS) {
2835   assert(cfs != NULL, "invariant");
2836   assert(promoted_flags != NULL, "invariant");
2837   assert(has_final_method != NULL, "invariant");
2838   assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2839 
2840   assert(NULL == _methods, "invariant");
2841 
2842   cfs->guarantee_more(2, CHECK);  // length
2843   const u2 length = cfs->get_u2_fast();
2844   if (length == 0) {
2845     _methods = Universe::the_empty_method_array();
2846   } else {
2847     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2848                                                    length,
2849                                                    NULL,
2850                                                    CHECK);
2851 
2852     HandleMark hm(THREAD);
2853     for (int index = 0; index < length; index++) {
2854       Method* method = parse_method(cfs,
2855                                     is_interface,
2856                                     _cp,
2857                                     promoted_flags,
2858                                     CHECK);
2859 
2860       if (method->is_final()) {
2861         *has_final_method = true;
2862       }
2863       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2864       // used for interface initialization, and default method inheritance analysis
2865       if (is_interface && !(*declares_nonstatic_concrete_methods)
2866         && !method->is_abstract() && !method->is_static()) {
2867         *declares_nonstatic_concrete_methods = true;
2868       }
2869       _methods->at_put(index, method);
2870     }
2871 
2872     if (_need_verify && length > 1) {
2873       // Check duplicated methods
2874       ResourceMark rm(THREAD);
2875       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2876         THREAD, NameSigHash*, HASH_ROW_SIZE);
2877       initialize_hashtable(names_and_sigs);
2878       bool dup = false;
2879       {
2880         debug_only(NoSafepointVerifier nsv;)
2881         for (int i = 0; i < length; i++) {
2882           const Method* const m = _methods->at(i);
2883           // If no duplicates, add name/signature in hashtable names_and_sigs.
2884           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2885             dup = true;
2886             break;
2887           }
2888         }
2889       }
2890       if (dup) {
2891         classfile_parse_error("Duplicate method name&signature in class file %s",
2892                               CHECK);
2893       }
2894     }
2895   }
2896 }
2897 
2898 static const intArray* sort_methods(Array<Method*>* methods) {
2899   const int length = methods->length();
2900   // If JVMTI original method ordering or sharing is enabled we have to
2901   // remember the original class file ordering.
2902   // We temporarily use the vtable_index field in the Method* to store the
2903   // class file index, so we can read in after calling qsort.
2904   // Put the method ordering in the shared archive.
2905   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2906     for (int index = 0; index < length; index++) {
2907       Method* const m = methods->at(index);
2908       assert(!m->valid_vtable_index(), "vtable index should not be set");
2909       m->set_vtable_index(index);
2910     }
2911   }
2912   // Sort method array by ascending method name (for faster lookups & vtable construction)
2913   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2914   Method::sort_methods(methods);
2915 
2916   intArray* method_ordering = NULL;
2917   // If JVMTI original method ordering or sharing is enabled construct int
2918   // array remembering the original ordering
2919   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2920     method_ordering = new intArray(length, length, -1);
2921     for (int index = 0; index < length; index++) {
2922       Method* const m = methods->at(index);
2923       const int old_index = m->vtable_index();
2924       assert(old_index >= 0 && old_index < length, "invalid method index");
2925       method_ordering->at_put(index, old_index);
2926       m->set_vtable_index(Method::invalid_vtable_index);
2927     }
2928   }
2929   return method_ordering;
2930 }
2931 
2932 // Parse generic_signature attribute for methods and fields
2933 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2934                                                       TRAPS) {
2935   assert(cfs != NULL, "invariant");
2936 
2937   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2938   const u2 generic_signature_index = cfs->get_u2_fast();
2939   check_property(
2940     valid_symbol_at(generic_signature_index),
2941     "Invalid Signature attribute at constant pool index %u in class file %s",
2942     generic_signature_index, CHECK_0);
2943   return generic_signature_index;
2944 }
2945 
2946 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2947                                                            TRAPS) {
2948 
2949   assert(cfs != NULL, "invariant");
2950 
2951   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2952   const u2 sourcefile_index = cfs->get_u2_fast();
2953   check_property(
2954     valid_symbol_at(sourcefile_index),
2955     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2956     sourcefile_index, CHECK);
2957   set_class_sourcefile_index(sourcefile_index);
2958 }
2959 
2960 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2961                                                                        int length,
2962                                                                        TRAPS) {
2963   assert(cfs != NULL, "invariant");
2964 
2965   const u1* const sde_buffer = cfs->get_u1_buffer();
2966   assert(sde_buffer != NULL, "null sde buffer");
2967 
2968   // Don't bother storing it if there is no way to retrieve it
2969   if (JvmtiExport::can_get_source_debug_extension()) {
2970     assert((length+1) > length, "Overflow checking");
2971     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2972     for (int i = 0; i < length; i++) {
2973       sde[i] = sde_buffer[i];
2974     }
2975     sde[length] = '\0';
2976     set_class_sde_buffer((const char*)sde, length);
2977   }
2978   // Got utf8 string, set stream position forward
2979   cfs->skip_u1(length, CHECK);
2980 }
2981 
2982 
2983 // Inner classes can be static, private or protected (classic VM does this)
2984 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2985                                            JVM_ACC_PRIVATE |                \
2986                                            JVM_ACC_PROTECTED |              \
2987                                            JVM_ACC_STATIC                   \
2988                                          )
2989 
2990 // Return number of classes in the inner classes attribute table
2991 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
2992                                                             const u1* const inner_classes_attribute_start,
2993                                                             bool parsed_enclosingmethod_attribute,
2994                                                             u2 enclosing_method_class_index,
2995                                                             u2 enclosing_method_method_index,
2996                                                             TRAPS) {
2997   const u1* const current_mark = cfs->current();
2998   u2 length = 0;
2999   if (inner_classes_attribute_start != NULL) {
3000     cfs->set_current(inner_classes_attribute_start);
3001     cfs->guarantee_more(2, CHECK_0);  // length
3002     length = cfs->get_u2_fast();
3003   }
3004 
3005   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3006   // method data:
3007   //   [inner_class_info_index,
3008   //    outer_class_info_index,
3009   //    inner_name_index,
3010   //    inner_class_access_flags,
3011   //    ...
3012   //    enclosing_method_class_index,
3013   //    enclosing_method_method_index]
3014   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3015   Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3016   _inner_classes = inner_classes;
3017 
3018   int index = 0;
3019   const int cp_size = _cp->length();
3020   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
3021   for (int n = 0; n < length; n++) {
3022     // Inner class index
3023     const u2 inner_class_info_index = cfs->get_u2_fast();
3024     check_property(
3025       valid_klass_reference_at(inner_class_info_index),
3026       "inner_class_info_index %u has bad constant type in class file %s",
3027       inner_class_info_index, CHECK_0);
3028     // Outer class index
3029     const u2 outer_class_info_index = cfs->get_u2_fast();
3030     check_property(
3031       outer_class_info_index == 0 ||
3032         valid_klass_reference_at(outer_class_info_index),
3033       "outer_class_info_index %u has bad constant type in class file %s",
3034       outer_class_info_index, CHECK_0);
3035     // Inner class name
3036     const u2 inner_name_index = cfs->get_u2_fast();
3037     check_property(
3038       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3039       "inner_name_index %u has bad constant type in class file %s",
3040       inner_name_index, CHECK_0);
3041     if (_need_verify) {
3042       guarantee_property(inner_class_info_index != outer_class_info_index,
3043                          "Class is both outer and inner class in class file %s", CHECK_0);
3044     }
3045     // Access flags
3046     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3047     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3048       // Set abstract bit for old class files for backward compatibility
3049       flags |= JVM_ACC_ABSTRACT;
3050     }
3051     verify_legal_class_modifiers(flags, CHECK_0);
3052     AccessFlags inner_access_flags(flags);
3053 
3054     inner_classes->at_put(index++, inner_class_info_index);
3055     inner_classes->at_put(index++, outer_class_info_index);
3056     inner_classes->at_put(index++, inner_name_index);
3057     inner_classes->at_put(index++, inner_access_flags.as_short());
3058   }
3059 
3060   // 4347400: make sure there's no duplicate entry in the classes array
3061   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3062     for(int i = 0; i < length * 4; i += 4) {
3063       for(int j = i + 4; j < length * 4; j += 4) {
3064         guarantee_property((inner_classes->at(i)   != inner_classes->at(j) ||
3065                             inner_classes->at(i+1) != inner_classes->at(j+1) ||
3066                             inner_classes->at(i+2) != inner_classes->at(j+2) ||
3067                             inner_classes->at(i+3) != inner_classes->at(j+3)),
3068                             "Duplicate entry in InnerClasses in class file %s",
3069                             CHECK_0);
3070       }
3071     }
3072   }
3073 
3074   // Set EnclosingMethod class and method indexes.
3075   if (parsed_enclosingmethod_attribute) {
3076     inner_classes->at_put(index++, enclosing_method_class_index);
3077     inner_classes->at_put(index++, enclosing_method_method_index);
3078   }
3079   assert(index == size, "wrong size");
3080 
3081   // Restore buffer's current position.
3082   cfs->set_current(current_mark);
3083 
3084   return length;
3085 }
3086 
3087 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3088   set_class_synthetic_flag(true);
3089 }
3090 
3091 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3092   assert(cfs != NULL, "invariant");
3093 
3094   const u2 signature_index = cfs->get_u2(CHECK);
3095   check_property(
3096     valid_symbol_at(signature_index),
3097     "Invalid constant pool index %u in Signature attribute in class file %s",
3098     signature_index, CHECK);
3099   set_class_generic_signature_index(signature_index);
3100 }
3101 
3102 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3103                                                                   ConstantPool* cp,
3104                                                                   u4 attribute_byte_length,
3105                                                                   TRAPS) {
3106   assert(cfs != NULL, "invariant");
3107   assert(cp != NULL, "invariant");
3108 
3109   const u1* const current_start = cfs->current();
3110 
3111   guarantee_property(attribute_byte_length >= sizeof(u2),
3112                      "Invalid BootstrapMethods attribute length %u in class file %s",
3113                      attribute_byte_length,
3114                      CHECK);
3115 
3116   cfs->guarantee_more(attribute_byte_length, CHECK);
3117 
3118   const int attribute_array_length = cfs->get_u2_fast();
3119 
3120   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3121                      "Short length on BootstrapMethods in class file %s",
3122                      CHECK);
3123 
3124 
3125   // The attribute contains a counted array of counted tuples of shorts,
3126   // represending bootstrap specifiers:
3127   //    length*{bootstrap_method_index, argument_count*{argument_index}}
3128   const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3129   // operand_count = number of shorts in attr, except for leading length
3130 
3131   // The attribute is copied into a short[] array.
3132   // The array begins with a series of short[2] pairs, one for each tuple.
3133   const int index_size = (attribute_array_length * 2);
3134 
3135   Array<u2>* const operands =
3136     MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3137 
3138   // Eagerly assign operands so they will be deallocated with the constant
3139   // pool if there is an error.
3140   cp->set_operands(operands);
3141 
3142   int operand_fill_index = index_size;
3143   const int cp_size = cp->length();
3144 
3145   for (int n = 0; n < attribute_array_length; n++) {
3146     // Store a 32-bit offset into the header of the operand array.
3147     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3148 
3149     // Read a bootstrap specifier.
3150     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3151     const u2 bootstrap_method_index = cfs->get_u2_fast();
3152     const u2 argument_count = cfs->get_u2_fast();
3153     check_property(
3154       valid_cp_range(bootstrap_method_index, cp_size) &&
3155       cp->tag_at(bootstrap_method_index).is_method_handle(),
3156       "bootstrap_method_index %u has bad constant type in class file %s",
3157       bootstrap_method_index,
3158       CHECK);
3159 
3160     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3161       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3162       CHECK);
3163 
3164     operands->at_put(operand_fill_index++, bootstrap_method_index);
3165     operands->at_put(operand_fill_index++, argument_count);
3166 
3167     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
3168     for (int j = 0; j < argument_count; j++) {
3169       const u2 argument_index = cfs->get_u2_fast();
3170       check_property(
3171         valid_cp_range(argument_index, cp_size) &&
3172         cp->tag_at(argument_index).is_loadable_constant(),
3173         "argument_index %u has bad constant type in class file %s",
3174         argument_index,
3175         CHECK);
3176       operands->at_put(operand_fill_index++, argument_index);
3177     }
3178   }
3179   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3180                      "Bad length on BootstrapMethods in class file %s",
3181                      CHECK);
3182 }
3183 
3184 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3185                                                  ConstantPool* cp,
3186                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3187                                                  TRAPS) {
3188   assert(cfs != NULL, "invariant");
3189   assert(cp != NULL, "invariant");
3190   assert(parsed_annotations != NULL, "invariant");
3191 
3192   // Set inner classes attribute to default sentinel
3193   _inner_classes = Universe::the_empty_short_array();
3194   cfs->guarantee_more(2, CHECK);  // attributes_count
3195   u2 attributes_count = cfs->get_u2_fast();
3196   bool parsed_sourcefile_attribute = false;
3197   bool parsed_innerclasses_attribute = false;
3198   bool parsed_enclosingmethod_attribute = false;
3199   bool parsed_bootstrap_methods_attribute = false;
3200   const u1* runtime_visible_annotations = NULL;
3201   int runtime_visible_annotations_length = 0;
3202   const u1* runtime_invisible_annotations = NULL;
3203   int runtime_invisible_annotations_length = 0;
3204   const u1* runtime_visible_type_annotations = NULL;
3205   int runtime_visible_type_annotations_length = 0;
3206   const u1* runtime_invisible_type_annotations = NULL;
3207   int runtime_invisible_type_annotations_length = 0;
3208   bool runtime_invisible_type_annotations_exists = false;
3209   bool runtime_invisible_annotations_exists = false;
3210   bool parsed_source_debug_ext_annotations_exist = false;
3211   const u1* inner_classes_attribute_start = NULL;
3212   u4  inner_classes_attribute_length = 0;
3213   u2  enclosing_method_class_index = 0;
3214   u2  enclosing_method_method_index = 0;
3215   // Iterate over attributes
3216   while (attributes_count--) {
3217     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3218     const u2 attribute_name_index = cfs->get_u2_fast();
3219     const u4 attribute_length = cfs->get_u4_fast();
3220     check_property(
3221       valid_symbol_at(attribute_name_index),
3222       "Attribute name has bad constant pool index %u in class file %s",
3223       attribute_name_index, CHECK);
3224     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3225     if (tag == vmSymbols::tag_source_file()) {
3226       // Check for SourceFile tag
3227       if (_need_verify) {
3228         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3229       }
3230       if (parsed_sourcefile_attribute) {
3231         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3232       } else {
3233         parsed_sourcefile_attribute = true;
3234       }
3235       parse_classfile_sourcefile_attribute(cfs, CHECK);
3236     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3237       // Check for SourceDebugExtension tag
3238       if (parsed_source_debug_ext_annotations_exist) {
3239           classfile_parse_error(
3240             "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3241       }
3242       parsed_source_debug_ext_annotations_exist = true;
3243       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3244     } else if (tag == vmSymbols::tag_inner_classes()) {
3245       // Check for InnerClasses tag
3246       if (parsed_innerclasses_attribute) {
3247         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3248       } else {
3249         parsed_innerclasses_attribute = true;
3250       }
3251       inner_classes_attribute_start = cfs->get_u1_buffer();
3252       inner_classes_attribute_length = attribute_length;
3253       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3254     } else if (tag == vmSymbols::tag_synthetic()) {
3255       // Check for Synthetic tag
3256       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3257       if (attribute_length != 0) {
3258         classfile_parse_error(
3259           "Invalid Synthetic classfile attribute length %u in class file %s",
3260           attribute_length, CHECK);
3261       }
3262       parse_classfile_synthetic_attribute(CHECK);
3263     } else if (tag == vmSymbols::tag_deprecated()) {
3264       // Check for Deprecatd tag - 4276120
3265       if (attribute_length != 0) {
3266         classfile_parse_error(
3267           "Invalid Deprecated classfile attribute length %u in class file %s",
3268           attribute_length, CHECK);
3269       }
3270     } else if (_major_version >= JAVA_1_5_VERSION) {
3271       if (tag == vmSymbols::tag_signature()) {
3272         if (attribute_length != 2) {
3273           classfile_parse_error(
3274             "Wrong Signature attribute length %u in class file %s",
3275             attribute_length, CHECK);
3276         }
3277         parse_classfile_signature_attribute(cfs, CHECK);
3278       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3279         if (runtime_visible_annotations != NULL) {
3280           classfile_parse_error(
3281             "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3282         }
3283         runtime_visible_annotations_length = attribute_length;
3284         runtime_visible_annotations = cfs->get_u1_buffer();
3285         assert(runtime_visible_annotations != NULL, "null visible annotations");
3286         parse_annotations(cp,
3287                           runtime_visible_annotations,
3288                           runtime_visible_annotations_length,
3289                           parsed_annotations,
3290                           _loader_data,
3291                           CHECK);
3292         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
3293       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3294         if (runtime_invisible_annotations_exists) {
3295           classfile_parse_error(
3296             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3297         }
3298         runtime_invisible_annotations_exists = true;
3299         if (PreserveAllAnnotations) {
3300           runtime_invisible_annotations_length = attribute_length;
3301           runtime_invisible_annotations = cfs->get_u1_buffer();
3302           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3303         }
3304         cfs->skip_u1(attribute_length, CHECK);
3305       } else if (tag == vmSymbols::tag_enclosing_method()) {
3306         if (parsed_enclosingmethod_attribute) {
3307           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3308         } else {
3309           parsed_enclosingmethod_attribute = true;
3310         }
3311         guarantee_property(attribute_length == 4,
3312           "Wrong EnclosingMethod attribute length %u in class file %s",
3313           attribute_length, CHECK);
3314         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3315         enclosing_method_class_index  = cfs->get_u2_fast();
3316         enclosing_method_method_index = cfs->get_u2_fast();
3317         if (enclosing_method_class_index == 0) {
3318           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3319         }
3320         // Validate the constant pool indices and types
3321         check_property(valid_klass_reference_at(enclosing_method_class_index),
3322           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3323         if (enclosing_method_method_index != 0 &&
3324             (!cp->is_within_bounds(enclosing_method_method_index) ||
3325              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3326           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3327         }
3328       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3329                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3330         if (parsed_bootstrap_methods_attribute) {
3331           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3332         }
3333         parsed_bootstrap_methods_attribute = true;
3334         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3335       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3336         if (runtime_visible_type_annotations != NULL) {
3337           classfile_parse_error(
3338             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3339         }
3340         runtime_visible_type_annotations_length = attribute_length;
3341         runtime_visible_type_annotations = cfs->get_u1_buffer();
3342         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3343         // No need for the VM to parse Type annotations
3344         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3345       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3346         if (runtime_invisible_type_annotations_exists) {
3347           classfile_parse_error(
3348             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3349         } else {
3350           runtime_invisible_type_annotations_exists = true;
3351         }
3352         if (PreserveAllAnnotations) {
3353           runtime_invisible_type_annotations_length = attribute_length;
3354           runtime_invisible_type_annotations = cfs->get_u1_buffer();
3355           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3356         }
3357         cfs->skip_u1(attribute_length, CHECK);
3358       } else {
3359         // Unknown attribute
3360         cfs->skip_u1(attribute_length, CHECK);
3361       }
3362     } else {
3363       // Unknown attribute
3364       cfs->skip_u1(attribute_length, CHECK);
3365     }
3366   }
3367   _annotations = assemble_annotations(runtime_visible_annotations,
3368                                       runtime_visible_annotations_length,
3369                                       runtime_invisible_annotations,
3370                                       runtime_invisible_annotations_length,
3371                                       CHECK);
3372   _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3373                                            runtime_visible_type_annotations_length,
3374                                            runtime_invisible_type_annotations,
3375                                            runtime_invisible_type_annotations_length,
3376                                            CHECK);
3377 
3378   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3379     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3380                             cfs,
3381                             inner_classes_attribute_start,
3382                             parsed_innerclasses_attribute,
3383                             enclosing_method_class_index,
3384                             enclosing_method_method_index,
3385                             CHECK);
3386     if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3387       guarantee_property(
3388         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3389         "Wrong InnerClasses attribute length in class file %s", CHECK);
3390     }
3391   }
3392 
3393   if (_max_bootstrap_specifier_index >= 0) {
3394     guarantee_property(parsed_bootstrap_methods_attribute,
3395                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3396   }
3397 }
3398 
3399 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3400   assert(k != NULL, "invariant");
3401 
3402   if (_synthetic_flag)
3403     k->set_is_synthetic();
3404   if (_sourcefile_index != 0) {
3405     k->set_source_file_name_index(_sourcefile_index);
3406   }
3407   if (_generic_signature_index != 0) {
3408     k->set_generic_signature_index(_generic_signature_index);
3409   }
3410   if (_sde_buffer != NULL) {
3411     k->set_source_debug_extension(_sde_buffer, _sde_length);
3412   }
3413 }
3414 
3415 // Create the Annotations object that will
3416 // hold the annotations array for the Klass.
3417 void ClassFileParser::create_combined_annotations(TRAPS) {
3418     if (_annotations == NULL &&
3419         _type_annotations == NULL &&
3420         _fields_annotations == NULL &&
3421         _fields_type_annotations == NULL) {
3422       // Don't create the Annotations object unnecessarily.
3423       return;
3424     }
3425 
3426     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3427     annotations->set_class_annotations(_annotations);
3428     annotations->set_class_type_annotations(_type_annotations);
3429     annotations->set_fields_annotations(_fields_annotations);
3430     annotations->set_fields_type_annotations(_fields_type_annotations);
3431 
3432     // This is the Annotations object that will be
3433     // assigned to InstanceKlass being constructed.
3434     _combined_annotations = annotations;
3435 
3436     // The annotations arrays below has been transfered the
3437     // _combined_annotations so these fields can now be cleared.
3438     _annotations             = NULL;
3439     _type_annotations        = NULL;
3440     _fields_annotations      = NULL;
3441     _fields_type_annotations = NULL;
3442 }
3443 
3444 // Transfer ownership of metadata allocated to the InstanceKlass.
3445 void ClassFileParser::apply_parsed_class_metadata(
3446                                             InstanceKlass* this_klass,
3447                                             int java_fields_count, TRAPS) {
3448   assert(this_klass != NULL, "invariant");
3449 
3450   _cp->set_pool_holder(this_klass);
3451   this_klass->set_constants(_cp);
3452   this_klass->set_fields(_fields, java_fields_count);
3453   this_klass->set_methods(_methods);
3454   this_klass->set_inner_classes(_inner_classes);
3455   this_klass->set_local_interfaces(_local_interfaces);
3456   this_klass->set_transitive_interfaces(_transitive_interfaces);
3457   this_klass->set_annotations(_combined_annotations);
3458 
3459   // Clear out these fields so they don't get deallocated by the destructor
3460   clear_class_metadata();
3461 }
3462 
3463 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3464                                                        int runtime_visible_annotations_length,
3465                                                        const u1* const runtime_invisible_annotations,
3466                                                        int runtime_invisible_annotations_length,
3467                                                        TRAPS) {
3468   AnnotationArray* annotations = NULL;
3469   if (runtime_visible_annotations != NULL ||
3470       runtime_invisible_annotations != NULL) {
3471     annotations = MetadataFactory::new_array<u1>(_loader_data,
3472                                           runtime_visible_annotations_length +
3473                                           runtime_invisible_annotations_length,
3474                                           CHECK_(annotations));
3475     if (runtime_visible_annotations != NULL) {
3476       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3477         annotations->at_put(i, runtime_visible_annotations[i]);
3478       }
3479     }
3480     if (runtime_invisible_annotations != NULL) {
3481       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3482         int append = runtime_visible_annotations_length+i;
3483         annotations->at_put(append, runtime_invisible_annotations[i]);
3484       }
3485     }
3486   }
3487   return annotations;
3488 }
3489 
3490 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3491                                                         const int super_class_index,
3492                                                         const bool need_verify,
3493                                                         TRAPS) {
3494   assert(cp != NULL, "invariant");
3495   const InstanceKlass* super_klass = NULL;
3496 
3497   if (super_class_index == 0) {
3498     check_property(_class_name == vmSymbols::java_lang_Object(),
3499                    "Invalid superclass index %u in class file %s",
3500                    super_class_index,
3501                    CHECK_NULL);
3502   } else {
3503     check_property(valid_klass_reference_at(super_class_index),
3504                    "Invalid superclass index %u in class file %s",
3505                    super_class_index,
3506                    CHECK_NULL);
3507     // The class name should be legal because it is checked when parsing constant pool.
3508     // However, make sure it is not an array type.
3509     bool is_array = false;
3510     if (cp->tag_at(super_class_index).is_klass()) {
3511       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3512       if (need_verify)
3513         is_array = super_klass->is_array_klass();
3514     } else if (need_verify) {
3515       is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3516     }
3517     if (need_verify) {
3518       guarantee_property(!is_array,
3519                         "Bad superclass name in class file %s", CHECK_NULL);
3520     }
3521   }
3522   return super_klass;
3523 }
3524 
3525 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3526                                           unsigned int nonstatic_oop_map_count,
3527                                           int first_nonstatic_oop_offset) {
3528 
3529   unsigned int map_count =
3530     NULL == super ? 0 : super->nonstatic_oop_map_count();
3531   if (nonstatic_oop_map_count > 0) {
3532     // We have oops to add to map
3533     if (map_count == 0) {
3534       map_count = nonstatic_oop_map_count;
3535     }
3536     else {
3537       // Check whether we should add a new map block or whether the last one can
3538       // be extended
3539       const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3540       const OopMapBlock* const last_map = first_map + map_count - 1;
3541 
3542       const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3543       if (next_offset == first_nonstatic_oop_offset) {
3544         // There is no gap bettwen superklass's last oop field and first
3545         // local oop field, merge maps.
3546         nonstatic_oop_map_count -= 1;
3547       }
3548       else {
3549         // Superklass didn't end with a oop field, add extra maps
3550         assert(next_offset < first_nonstatic_oop_offset, "just checking");
3551       }
3552       map_count += nonstatic_oop_map_count;
3553     }
3554   }
3555   return map_count;
3556 }
3557 
3558 #ifndef PRODUCT
3559 static void print_field_layout(const Symbol* name,
3560                                Array<u2>* fields,
3561                                constantPoolHandle cp,
3562                                int instance_size,
3563                                int instance_fields_start,
3564                                int instance_fields_end,
3565                                int static_fields_end) {
3566 
3567   assert(name != NULL, "invariant");
3568 
3569   tty->print("%s: field layout\n", name->as_klass_external_name());
3570   tty->print("  @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3571   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3572     if (!fs.access_flags().is_static()) {
3573       tty->print("  @%3d \"%s\" %s\n",
3574         fs.offset(),
3575         fs.name()->as_klass_external_name(),
3576         fs.signature()->as_klass_external_name());
3577     }
3578   }
3579   tty->print("  @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3580   tty->print("  @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3581   tty->print("  @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3582   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3583     if (fs.access_flags().is_static()) {
3584       tty->print("  @%3d \"%s\" %s\n",
3585         fs.offset(),
3586         fs.name()->as_klass_external_name(),
3587         fs.signature()->as_klass_external_name());
3588     }
3589   }
3590   tty->print("  @%3d %s\n", static_fields_end, "--- static fields end ---");
3591   tty->print("\n");
3592 }
3593 #endif
3594 
3595 // Values needed for oopmap and InstanceKlass creation
3596 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3597  public:
3598   int*          nonstatic_oop_offsets;
3599   unsigned int* nonstatic_oop_counts;
3600   unsigned int  nonstatic_oop_map_count;
3601   unsigned int  total_oop_map_count;
3602   int           instance_size;
3603   int           nonstatic_field_size;
3604   int           static_field_size;
3605   bool          has_nonstatic_fields;
3606 };
3607 
3608 // Layout fields and fill in FieldLayoutInfo.  Could use more refactoring!
3609 void ClassFileParser::layout_fields(ConstantPool* cp,
3610                                     const FieldAllocationCount* fac,
3611                                     const ClassAnnotationCollector* parsed_annotations,
3612                                     FieldLayoutInfo* info,
3613                                     TRAPS) {
3614 
3615   assert(cp != NULL, "invariant");
3616 
3617   // Field size and offset computation
3618   int nonstatic_field_size = _super_klass == NULL ? 0 :
3619                                _super_klass->nonstatic_field_size();
3620 
3621   // Count the contended fields by type.
3622   //
3623   // We ignore static fields, because @Contended is not supported for them.
3624   // The layout code below will also ignore the static fields.
3625   int nonstatic_contended_count = 0;
3626   FieldAllocationCount fac_contended;
3627   for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3628     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3629     if (fs.is_contended()) {
3630       fac_contended.count[atype]++;
3631       if (!fs.access_flags().is_static()) {
3632         nonstatic_contended_count++;
3633       }
3634     }
3635   }
3636 
3637 
3638   // Calculate the starting byte offsets
3639   int next_static_oop_offset    = InstanceMirrorKlass::offset_of_static_fields();
3640   int next_static_double_offset = next_static_oop_offset +
3641                                       ((fac->count[STATIC_OOP]) * heapOopSize);
3642   if ( fac->count[STATIC_DOUBLE] &&
3643        (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3644         Universe::field_type_should_be_aligned(T_LONG)) ) {
3645     next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3646   }
3647 
3648   int next_static_word_offset   = next_static_double_offset +
3649                                     ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3650   int next_static_short_offset  = next_static_word_offset +
3651                                     ((fac->count[STATIC_WORD]) * BytesPerInt);
3652   int next_static_byte_offset   = next_static_short_offset +
3653                                   ((fac->count[STATIC_SHORT]) * BytesPerShort);
3654 
3655   int nonstatic_fields_start  = instanceOopDesc::base_offset_in_bytes() +
3656                                 nonstatic_field_size * heapOopSize;
3657 
3658   int next_nonstatic_field_offset = nonstatic_fields_start;
3659 
3660   const bool is_contended_class     = parsed_annotations->is_contended();
3661 
3662   // Class is contended, pad before all the fields
3663   if (is_contended_class) {
3664     next_nonstatic_field_offset += ContendedPaddingWidth;
3665   }
3666 
3667   // Compute the non-contended fields count.
3668   // The packing code below relies on these counts to determine if some field
3669   // can be squeezed into the alignment gap. Contended fields are obviously
3670   // exempt from that.
3671   unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3672   unsigned int nonstatic_word_count   = fac->count[NONSTATIC_WORD]   - fac_contended.count[NONSTATIC_WORD];
3673   unsigned int nonstatic_short_count  = fac->count[NONSTATIC_SHORT]  - fac_contended.count[NONSTATIC_SHORT];
3674   unsigned int nonstatic_byte_count   = fac->count[NONSTATIC_BYTE]   - fac_contended.count[NONSTATIC_BYTE];
3675   unsigned int nonstatic_oop_count    = fac->count[NONSTATIC_OOP]    - fac_contended.count[NONSTATIC_OOP];
3676 
3677   // Total non-static fields count, including every contended field
3678   unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3679                                         fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3680                                         fac->count[NONSTATIC_OOP];
3681 
3682   const bool super_has_nonstatic_fields =
3683           (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3684   const bool has_nonstatic_fields =
3685     super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3686 
3687 
3688   // Prepare list of oops for oop map generation.
3689   //
3690   // "offset" and "count" lists are describing the set of contiguous oop
3691   // regions. offset[i] is the start of the i-th region, which then has
3692   // count[i] oops following. Before we know how many regions are required,
3693   // we pessimistically allocate the maps to fit all the oops into the
3694   // distinct regions.
3695   //
3696   // TODO: We add +1 to always allocate non-zero resource arrays; we need
3697   // to figure out if we still need to do this.
3698   unsigned int nonstatic_oop_map_count = 0;
3699   unsigned int max_nonstatic_oop_maps  = fac->count[NONSTATIC_OOP] + 1;
3700 
3701   int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3702             THREAD, int, max_nonstatic_oop_maps);
3703   unsigned int* const nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
3704             THREAD, unsigned int, max_nonstatic_oop_maps);
3705 
3706   int first_nonstatic_oop_offset = 0; // will be set for first oop field
3707 
3708   bool compact_fields   = CompactFields;
3709   int allocation_style = FieldsAllocationStyle;
3710   if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3711     assert(false, "0 <= FieldsAllocationStyle <= 2");
3712     allocation_style = 1; // Optimistic
3713   }
3714 
3715   // The next classes have predefined hard-coded fields offsets
3716   // (see in JavaClasses::compute_hard_coded_offsets()).
3717   // Use default fields allocation order for them.
3718   if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3719       (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3720        _class_name == vmSymbols::java_lang_Class() ||
3721        _class_name == vmSymbols::java_lang_ClassLoader() ||
3722        _class_name == vmSymbols::java_lang_ref_Reference() ||
3723        _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3724        _class_name == vmSymbols::java_lang_StackTraceElement() ||
3725        _class_name == vmSymbols::java_lang_String() ||
3726        _class_name == vmSymbols::java_lang_Throwable() ||
3727        _class_name == vmSymbols::java_lang_Boolean() ||
3728        _class_name == vmSymbols::java_lang_Character() ||
3729        _class_name == vmSymbols::java_lang_Float() ||
3730        _class_name == vmSymbols::java_lang_Double() ||
3731        _class_name == vmSymbols::java_lang_Byte() ||
3732        _class_name == vmSymbols::java_lang_Short() ||
3733        _class_name == vmSymbols::java_lang_Integer() ||
3734        _class_name == vmSymbols::java_lang_Long())) {
3735     allocation_style = 0;     // Allocate oops first
3736     compact_fields   = false; // Don't compact fields
3737   }
3738 
3739   int next_nonstatic_oop_offset = 0;
3740   int next_nonstatic_double_offset = 0;
3741 
3742   // Rearrange fields for a given allocation style
3743   if( allocation_style == 0 ) {
3744     // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3745     next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3746     next_nonstatic_double_offset = next_nonstatic_oop_offset +
3747                                     (nonstatic_oop_count * heapOopSize);
3748   } else if( allocation_style == 1 ) {
3749     // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3750     next_nonstatic_double_offset = next_nonstatic_field_offset;
3751   } else if( allocation_style == 2 ) {
3752     // Fields allocation: oops fields in super and sub classes are together.
3753     if( nonstatic_field_size > 0 && _super_klass != NULL &&
3754         _super_klass->nonstatic_oop_map_size() > 0 ) {
3755       const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3756       const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3757       const OopMapBlock* const last_map = first_map + map_count - 1;
3758       const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3759       if (next_offset == next_nonstatic_field_offset) {
3760         allocation_style = 0;   // allocate oops first
3761         next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3762         next_nonstatic_double_offset = next_nonstatic_oop_offset +
3763                                        (nonstatic_oop_count * heapOopSize);
3764       }
3765     }
3766     if( allocation_style == 2 ) {
3767       allocation_style = 1;     // allocate oops last
3768       next_nonstatic_double_offset = next_nonstatic_field_offset;
3769     }
3770   } else {
3771     ShouldNotReachHere();
3772   }
3773 
3774   int nonstatic_oop_space_count   = 0;
3775   int nonstatic_word_space_count  = 0;
3776   int nonstatic_short_space_count = 0;
3777   int nonstatic_byte_space_count  = 0;
3778   int nonstatic_oop_space_offset = 0;
3779   int nonstatic_word_space_offset = 0;
3780   int nonstatic_short_space_offset = 0;
3781   int nonstatic_byte_space_offset = 0;
3782 
3783   // Try to squeeze some of the fields into the gaps due to
3784   // long/double alignment.
3785   if (nonstatic_double_count > 0) {
3786     int offset = next_nonstatic_double_offset;
3787     next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3788     if (compact_fields && offset != next_nonstatic_double_offset) {
3789       // Allocate available fields into the gap before double field.
3790       int length = next_nonstatic_double_offset - offset;
3791       assert(length == BytesPerInt, "");
3792       nonstatic_word_space_offset = offset;
3793       if (nonstatic_word_count > 0) {
3794         nonstatic_word_count      -= 1;
3795         nonstatic_word_space_count = 1; // Only one will fit
3796         length -= BytesPerInt;
3797         offset += BytesPerInt;
3798       }
3799       nonstatic_short_space_offset = offset;
3800       while (length >= BytesPerShort && nonstatic_short_count > 0) {
3801         nonstatic_short_count       -= 1;
3802         nonstatic_short_space_count += 1;
3803         length -= BytesPerShort;
3804         offset += BytesPerShort;
3805       }
3806       nonstatic_byte_space_offset = offset;
3807       while (length > 0 && nonstatic_byte_count > 0) {
3808         nonstatic_byte_count       -= 1;
3809         nonstatic_byte_space_count += 1;
3810         length -= 1;
3811       }
3812       // Allocate oop field in the gap if there are no other fields for that.
3813       nonstatic_oop_space_offset = offset;
3814       if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3815           allocation_style != 0) { // when oop fields not first
3816         nonstatic_oop_count      -= 1;
3817         nonstatic_oop_space_count = 1; // Only one will fit
3818         length -= heapOopSize;
3819         offset += heapOopSize;
3820       }
3821     }
3822   }
3823 
3824   int next_nonstatic_word_offset = next_nonstatic_double_offset +
3825                                      (nonstatic_double_count * BytesPerLong);
3826   int next_nonstatic_short_offset = next_nonstatic_word_offset +
3827                                       (nonstatic_word_count * BytesPerInt);
3828   int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3829                                      (nonstatic_short_count * BytesPerShort);
3830   int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3831                                        nonstatic_byte_count;
3832 
3833   // let oops jump before padding with this allocation style
3834   if( allocation_style == 1 ) {
3835     next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3836     if( nonstatic_oop_count > 0 ) {
3837       next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3838     }
3839     next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3840   }
3841 
3842   // Iterate over fields again and compute correct offsets.
3843   // The field allocation type was temporarily stored in the offset slot.
3844   // oop fields are located before non-oop fields (static and non-static).
3845   for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3846 
3847     // skip already laid out fields
3848     if (fs.is_offset_set()) continue;
3849 
3850     // contended instance fields are handled below
3851     if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3852 
3853     int real_offset = 0;
3854     const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
3855 
3856     // pack the rest of the fields
3857     switch (atype) {
3858       case STATIC_OOP:
3859         real_offset = next_static_oop_offset;
3860         next_static_oop_offset += heapOopSize;
3861         break;
3862       case STATIC_BYTE:
3863         real_offset = next_static_byte_offset;
3864         next_static_byte_offset += 1;
3865         break;
3866       case STATIC_SHORT:
3867         real_offset = next_static_short_offset;
3868         next_static_short_offset += BytesPerShort;
3869         break;
3870       case STATIC_WORD:
3871         real_offset = next_static_word_offset;
3872         next_static_word_offset += BytesPerInt;
3873         break;
3874       case STATIC_DOUBLE:
3875         real_offset = next_static_double_offset;
3876         next_static_double_offset += BytesPerLong;
3877         break;
3878       case NONSTATIC_OOP:
3879         if( nonstatic_oop_space_count > 0 ) {
3880           real_offset = nonstatic_oop_space_offset;
3881           nonstatic_oop_space_offset += heapOopSize;
3882           nonstatic_oop_space_count  -= 1;
3883         } else {
3884           real_offset = next_nonstatic_oop_offset;
3885           next_nonstatic_oop_offset += heapOopSize;
3886         }
3887 
3888         // Record this oop in the oop maps
3889         if( nonstatic_oop_map_count > 0 &&
3890             nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3891             real_offset -
3892             int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3893             heapOopSize ) {
3894           // This oop is adjacent to the previous one, add to current oop map
3895           assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3896           nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3897         } else {
3898           // This oop is not adjacent to the previous one, create new oop map
3899           assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3900           nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3901           nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3902           nonstatic_oop_map_count += 1;
3903           if( first_nonstatic_oop_offset == 0 ) { // Undefined
3904             first_nonstatic_oop_offset = real_offset;
3905           }
3906         }
3907         break;
3908       case NONSTATIC_BYTE:
3909         if( nonstatic_byte_space_count > 0 ) {
3910           real_offset = nonstatic_byte_space_offset;
3911           nonstatic_byte_space_offset += 1;
3912           nonstatic_byte_space_count  -= 1;
3913         } else {
3914           real_offset = next_nonstatic_byte_offset;
3915           next_nonstatic_byte_offset += 1;
3916         }
3917         break;
3918       case NONSTATIC_SHORT:
3919         if( nonstatic_short_space_count > 0 ) {
3920           real_offset = nonstatic_short_space_offset;
3921           nonstatic_short_space_offset += BytesPerShort;
3922           nonstatic_short_space_count  -= 1;
3923         } else {
3924           real_offset = next_nonstatic_short_offset;
3925           next_nonstatic_short_offset += BytesPerShort;
3926         }
3927         break;
3928       case NONSTATIC_WORD:
3929         if( nonstatic_word_space_count > 0 ) {
3930           real_offset = nonstatic_word_space_offset;
3931           nonstatic_word_space_offset += BytesPerInt;
3932           nonstatic_word_space_count  -= 1;
3933         } else {
3934           real_offset = next_nonstatic_word_offset;
3935           next_nonstatic_word_offset += BytesPerInt;
3936         }
3937         break;
3938       case NONSTATIC_DOUBLE:
3939         real_offset = next_nonstatic_double_offset;
3940         next_nonstatic_double_offset += BytesPerLong;
3941         break;
3942       default:
3943         ShouldNotReachHere();
3944     }
3945     fs.set_offset(real_offset);
3946   }
3947 
3948 
3949   // Handle the contended cases.
3950   //
3951   // Each contended field should not intersect the cache line with another contended field.
3952   // In the absence of alignment information, we end up with pessimistically separating
3953   // the fields with full-width padding.
3954   //
3955   // Additionally, this should not break alignment for the fields, so we round the alignment up
3956   // for each field.
3957   if (nonstatic_contended_count > 0) {
3958 
3959     // if there is at least one contended field, we need to have pre-padding for them
3960     next_nonstatic_padded_offset += ContendedPaddingWidth;
3961 
3962     // collect all contended groups
3963     ResourceBitMap bm(cp->size());
3964     for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3965       // skip already laid out fields
3966       if (fs.is_offset_set()) continue;
3967 
3968       if (fs.is_contended()) {
3969         bm.set_bit(fs.contended_group());
3970       }
3971     }
3972 
3973     int current_group = -1;
3974     while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3975 
3976       for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3977 
3978         // skip already laid out fields
3979         if (fs.is_offset_set()) continue;
3980 
3981         // skip non-contended fields and fields from different group
3982         if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3983 
3984         // handle statics below
3985         if (fs.access_flags().is_static()) continue;
3986 
3987         int real_offset = 0;
3988         FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3989 
3990         switch (atype) {
3991           case NONSTATIC_BYTE:
3992             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
3993             real_offset = next_nonstatic_padded_offset;
3994             next_nonstatic_padded_offset += 1;
3995             break;
3996 
3997           case NONSTATIC_SHORT:
3998             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
3999             real_offset = next_nonstatic_padded_offset;
4000             next_nonstatic_padded_offset += BytesPerShort;
4001             break;
4002 
4003           case NONSTATIC_WORD:
4004             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
4005             real_offset = next_nonstatic_padded_offset;
4006             next_nonstatic_padded_offset += BytesPerInt;
4007             break;
4008 
4009           case NONSTATIC_DOUBLE:
4010             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
4011             real_offset = next_nonstatic_padded_offset;
4012             next_nonstatic_padded_offset += BytesPerLong;
4013             break;
4014 
4015           case NONSTATIC_OOP:
4016             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
4017             real_offset = next_nonstatic_padded_offset;
4018             next_nonstatic_padded_offset += heapOopSize;
4019 
4020             // Record this oop in the oop maps
4021             if( nonstatic_oop_map_count > 0 &&
4022                 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4023                 real_offset -
4024                 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4025                 heapOopSize ) {
4026               // This oop is adjacent to the previous one, add to current oop map
4027               assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4028               nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4029             } else {
4030               // This oop is not adjacent to the previous one, create new oop map
4031               assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4032               nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4033               nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4034               nonstatic_oop_map_count += 1;
4035               if( first_nonstatic_oop_offset == 0 ) { // Undefined
4036                 first_nonstatic_oop_offset = real_offset;
4037               }
4038             }
4039             break;
4040 
4041           default:
4042             ShouldNotReachHere();
4043         }
4044 
4045         if (fs.contended_group() == 0) {
4046           // Contended group defines the equivalence class over the fields:
4047           // the fields within the same contended group are not inter-padded.
4048           // The only exception is default group, which does not incur the
4049           // equivalence, and so requires intra-padding.
4050           next_nonstatic_padded_offset += ContendedPaddingWidth;
4051         }
4052 
4053         fs.set_offset(real_offset);
4054       } // for
4055 
4056       // Start laying out the next group.
4057       // Note that this will effectively pad the last group in the back;
4058       // this is expected to alleviate memory contention effects for
4059       // subclass fields and/or adjacent object.
4060       // If this was the default group, the padding is already in place.
4061       if (current_group != 0) {
4062         next_nonstatic_padded_offset += ContendedPaddingWidth;
4063       }
4064     }
4065 
4066     // handle static fields
4067   }
4068 
4069   // Entire class is contended, pad in the back.
4070   // This helps to alleviate memory contention effects for subclass fields
4071   // and/or adjacent object.
4072   if (is_contended_class) {
4073     next_nonstatic_padded_offset += ContendedPaddingWidth;
4074   }
4075 
4076   int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4077 
4078   int nonstatic_fields_end      = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
4079   int instance_end              = align_size_up(notaligned_nonstatic_fields_end, wordSize);
4080   int static_fields_end         = align_size_up(next_static_byte_offset, wordSize);
4081 
4082   int static_field_size         = (static_fields_end -
4083                                    InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4084   nonstatic_field_size          = nonstatic_field_size +
4085                                   (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4086 
4087   int instance_size             = align_object_size(instance_end / wordSize);
4088 
4089   assert(instance_size == align_object_size(align_size_up(
4090          (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4091           wordSize) / wordSize), "consistent layout helper value");
4092 
4093   // Invariant: nonstatic_field end/start should only change if there are
4094   // nonstatic fields in the class, or if the class is contended. We compare
4095   // against the non-aligned value, so that end alignment will not fail the
4096   // assert without actually having the fields.
4097   assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4098          is_contended_class ||
4099          (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4100 
4101   // Number of non-static oop map blocks allocated at end of klass.
4102   const unsigned int total_oop_map_count =
4103     compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4104                           first_nonstatic_oop_offset);
4105 
4106 #ifndef PRODUCT
4107   if (PrintFieldLayout) {
4108     print_field_layout(_class_name,
4109           _fields,
4110           cp,
4111           instance_size,
4112           nonstatic_fields_start,
4113           nonstatic_fields_end,
4114           static_fields_end);
4115   }
4116 
4117 #endif
4118   // Pass back information needed for InstanceKlass creation
4119   info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4120   info->nonstatic_oop_counts = nonstatic_oop_counts;
4121   info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4122   info->total_oop_map_count = total_oop_map_count;
4123   info->instance_size = instance_size;
4124   info->static_field_size = static_field_size;
4125   info->nonstatic_field_size = nonstatic_field_size;
4126   info->has_nonstatic_fields = has_nonstatic_fields;
4127 }
4128 
4129 static void fill_oop_maps(const InstanceKlass* k,
4130                           unsigned int nonstatic_oop_map_count,
4131                           const int* nonstatic_oop_offsets,
4132                           const unsigned int* nonstatic_oop_counts) {
4133 
4134   assert(k != NULL, "invariant");
4135 
4136   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4137   const InstanceKlass* const super = k->superklass();
4138   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4139   if (super_count > 0) {
4140     // Copy maps from superklass
4141     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4142     for (unsigned int i = 0; i < super_count; ++i) {
4143       *this_oop_map++ = *super_oop_map++;
4144     }
4145   }
4146 
4147   if (nonstatic_oop_map_count > 0) {
4148     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4149       // The counts differ because there is no gap between superklass's last oop
4150       // field and the first local oop field.  Extend the last oop map copied
4151       // from the superklass instead of creating new one.
4152       nonstatic_oop_map_count--;
4153       nonstatic_oop_offsets++;
4154       this_oop_map--;
4155       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4156       this_oop_map++;
4157     }
4158 
4159     // Add new map blocks, fill them
4160     while (nonstatic_oop_map_count-- > 0) {
4161       this_oop_map->set_offset(*nonstatic_oop_offsets++);
4162       this_oop_map->set_count(*nonstatic_oop_counts++);
4163       this_oop_map++;
4164     }
4165     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4166            this_oop_map, "sanity");
4167   }
4168 }
4169 
4170 
4171 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4172   assert(ik != NULL, "invariant");
4173 
4174   const Klass* const super = ik->super();
4175 
4176   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4177   // in which case we don't have to register objects as finalizable
4178   if (!_has_empty_finalizer) {
4179     if (_has_finalizer ||
4180         (super != NULL && super->has_finalizer())) {
4181       ik->set_has_finalizer();
4182     }
4183   }
4184 
4185 #ifdef ASSERT
4186   bool f = false;
4187   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4188                                            vmSymbols::void_method_signature());
4189   if (m != NULL && !m->is_empty_method()) {
4190       f = true;
4191   }
4192 
4193   // Spec doesn't prevent agent from redefinition of empty finalizer.
4194   // Despite the fact that it's generally bad idea and redefined finalizer
4195   // will not work as expected we shouldn't abort vm in this case
4196   if (!ik->has_redefined_this_or_super()) {
4197     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4198   }
4199 #endif
4200 
4201   // Check if this klass supports the java.lang.Cloneable interface
4202   if (SystemDictionary::Cloneable_klass_loaded()) {
4203     if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4204       ik->set_is_cloneable();
4205     }
4206   }
4207 
4208   // Check if this klass has a vanilla default constructor
4209   if (super == NULL) {
4210     // java.lang.Object has empty default constructor
4211     ik->set_has_vanilla_constructor();
4212   } else {
4213     if (super->has_vanilla_constructor() &&
4214         _has_vanilla_constructor) {
4215       ik->set_has_vanilla_constructor();
4216     }
4217 #ifdef ASSERT
4218     bool v = false;
4219     if (super->has_vanilla_constructor()) {
4220       const Method* const constructor =
4221         ik->find_method(vmSymbols::object_initializer_name(),
4222                        vmSymbols::void_method_signature());
4223       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4224         v = true;
4225       }
4226     }
4227     assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4228 #endif
4229   }
4230 
4231   // If it cannot be fast-path allocated, set a bit in the layout helper.
4232   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4233   assert(ik->size_helper() > 0, "layout_helper is initialized");
4234   if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4235       || ik->is_abstract() || ik->is_interface()
4236       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4237       || ik->size_helper() >= FastAllocateSizeLimit) {
4238     // Forbid fast-path allocation.
4239     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4240     ik->set_layout_helper(lh);
4241   }
4242 }
4243 
4244 // Attach super classes and interface classes to class loader data
4245 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4246                                               TRAPS) {
4247   assert(defined_klass != NULL, "invariant");
4248 
4249   ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4250   if (defining_loader_data->is_the_null_class_loader_data()) {
4251       // Dependencies to null class loader data are implicit.
4252       return;
4253   } else {
4254     // add super class dependency
4255     Klass* const super = defined_klass->super();
4256     if (super != NULL) {
4257       defining_loader_data->record_dependency(super, CHECK);
4258     }
4259 
4260     // add super interface dependencies
4261     const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4262     if (local_interfaces != NULL) {
4263       const int length = local_interfaces->length();
4264       for (int i = 0; i < length; i++) {
4265         defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4266       }
4267     }
4268   }
4269 }
4270 
4271 // utility methods for appending an array with check for duplicates
4272 
4273 static void append_interfaces(GrowableArray<Klass*>* result,
4274                               const Array<Klass*>* const ifs) {
4275   // iterate over new interfaces
4276   for (int i = 0; i < ifs->length(); i++) {
4277     Klass* const e = ifs->at(i);
4278     assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4279     // add new interface
4280     result->append_if_missing(e);
4281   }
4282 }
4283 
4284 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4285                                                     Array<Klass*>* local_ifs,
4286                                                     ClassLoaderData* loader_data,
4287                                                     TRAPS) {
4288   assert(local_ifs != NULL, "invariant");
4289   assert(loader_data != NULL, "invariant");
4290 
4291   // Compute maximum size for transitive interfaces
4292   int max_transitive_size = 0;
4293   int super_size = 0;
4294   // Add superclass transitive interfaces size
4295   if (super != NULL) {
4296     super_size = super->transitive_interfaces()->length();
4297     max_transitive_size += super_size;
4298   }
4299   // Add local interfaces' super interfaces
4300   const int local_size = local_ifs->length();
4301   for (int i = 0; i < local_size; i++) {
4302     Klass* const l = local_ifs->at(i);
4303     max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4304   }
4305   // Finally add local interfaces
4306   max_transitive_size += local_size;
4307   // Construct array
4308   if (max_transitive_size == 0) {
4309     // no interfaces, use canonicalized array
4310     return Universe::the_empty_klass_array();
4311   } else if (max_transitive_size == super_size) {
4312     // no new local interfaces added, share superklass' transitive interface array
4313     return super->transitive_interfaces();
4314   } else if (max_transitive_size == local_size) {
4315     // only local interfaces added, share local interface array
4316     return local_ifs;
4317   } else {
4318     ResourceMark rm;
4319     GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4320 
4321     // Copy down from superclass
4322     if (super != NULL) {
4323       append_interfaces(result, super->transitive_interfaces());
4324     }
4325 
4326     // Copy down from local interfaces' superinterfaces
4327     for (int i = 0; i < local_size; i++) {
4328       Klass* const l = local_ifs->at(i);
4329       append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4330     }
4331     // Finally add local interfaces
4332     append_interfaces(result, local_ifs);
4333 
4334     // length will be less than the max_transitive_size if duplicates were removed
4335     const int length = result->length();
4336     assert(length <= max_transitive_size, "just checking");
4337     Array<Klass*>* const new_result =
4338       MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4339     for (int i = 0; i < length; i++) {
4340       Klass* const e = result->at(i);
4341       assert(e != NULL, "just checking");
4342       new_result->at_put(i, e);
4343     }
4344     return new_result;
4345   }
4346 }
4347 
4348 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4349   assert(this_klass != NULL, "invariant");
4350   const Klass* const super = this_klass->super();
4351 
4352   if (super != NULL) {
4353     // Throw an exception if superclass is in package jdk.internal.reflect and
4354     // loader is neither the boot loader nor a subclass of the special reflection
4355     // class loader
4356     assert(super->is_instance_klass(), "super is not instance klass");
4357     PackageEntry* super_package = super->package();
4358     if (super_package != NULL) {
4359       ClassLoaderData* this_cld = this_klass->class_loader_data();
4360       if (super_package->name() == vmSymbols::jdk_internal_reflect() &&
4361           !this_cld->is_the_null_class_loader_data() &&
4362           this_klass->class_loader() ==
4363             java_lang_ClassLoader::non_reflection_class_loader(this_klass->class_loader())) {
4364         ResourceMark rm(THREAD);
4365         Exceptions::fthrow(
4366           THREAD_AND_LOCATION,
4367           vmSymbols::java_lang_IllegalAccessError(),
4368           "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4369           this_klass->external_name(), this_cld->loader_name(), super->external_name());
4370       }
4371     }
4372 
4373     Reflection::VerifyClassAccessResults vca_result =
4374       Reflection::verify_class_access(this_klass, super, false);
4375     if (vca_result != Reflection::ACCESS_OK) {
4376       ResourceMark rm(THREAD);
4377       char* msg =  Reflection::verify_class_access_msg(this_klass, super, vca_result);
4378       if (msg == NULL) {
4379         Exceptions::fthrow(
4380           THREAD_AND_LOCATION,
4381           vmSymbols::java_lang_IllegalAccessError(),
4382           "class %s cannot access its superclass %s",
4383           this_klass->external_name(),
4384           super->external_name());
4385       } else {
4386         // Add additional message content.
4387         Exceptions::fthrow(
4388           THREAD_AND_LOCATION,
4389           vmSymbols::java_lang_IllegalAccessError(),
4390           "superclass access check failed: %s",
4391           msg);
4392       }
4393     }
4394   }
4395 }
4396 
4397 
4398 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4399   assert(this_klass != NULL, "invariant");
4400   const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4401   const int lng = local_interfaces->length();
4402   for (int i = lng - 1; i >= 0; i--) {
4403     Klass* const k = local_interfaces->at(i);
4404     assert (k != NULL && k->is_interface(), "invalid interface");
4405     Reflection::VerifyClassAccessResults vca_result =
4406       Reflection::verify_class_access(this_klass, k, false);
4407     if (vca_result != Reflection::ACCESS_OK) {
4408       ResourceMark rm(THREAD);
4409       char* msg =  Reflection::verify_class_access_msg(this_klass, k, vca_result);
4410       if (msg == NULL) {
4411         Exceptions::fthrow(
4412           THREAD_AND_LOCATION,
4413           vmSymbols::java_lang_IllegalAccessError(),
4414           "class %s cannot access its superinterface %s",
4415           this_klass->external_name(),
4416           k->external_name());
4417       } else {
4418         // Add additional message content.
4419         Exceptions::fthrow(
4420           THREAD_AND_LOCATION,
4421           vmSymbols::java_lang_IllegalAccessError(),
4422           "superinterface check failed: %s",
4423           msg);
4424       }
4425     }
4426   }
4427 }
4428 
4429 
4430 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4431   assert(this_klass != NULL, "invariant");
4432   const Array<Method*>* const methods = this_klass->methods();
4433   const int num_methods = methods->length();
4434 
4435   // go thru each method and check if it overrides a final method
4436   for (int index = 0; index < num_methods; index++) {
4437     const Method* const m = methods->at(index);
4438 
4439     // skip private, static, and <init> methods
4440     if ((!m->is_private() && !m->is_static()) &&
4441         (m->name() != vmSymbols::object_initializer_name())) {
4442 
4443       const Symbol* const name = m->name();
4444       const Symbol* const signature = m->signature();
4445       const Klass* k = this_klass->super();
4446       const Method* super_m = NULL;
4447       while (k != NULL) {
4448         // skip supers that don't have final methods.
4449         if (k->has_final_method()) {
4450           // lookup a matching method in the super class hierarchy
4451           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4452           if (super_m == NULL) {
4453             break; // didn't find any match; get out
4454           }
4455 
4456           if (super_m->is_final() && !super_m->is_static() &&
4457               // matching method in super is final, and not static
4458               (Reflection::verify_field_access(this_klass,
4459                                                super_m->method_holder(),
4460                                                super_m->method_holder(),
4461                                                super_m->access_flags(), false))
4462             // this class can access super final method and therefore override
4463             ) {
4464             ResourceMark rm(THREAD);
4465             Exceptions::fthrow(
4466               THREAD_AND_LOCATION,
4467               vmSymbols::java_lang_VerifyError(),
4468               "class %s overrides final method %s.%s%s",
4469               this_klass->external_name(),
4470               super_m->method_holder()->external_name(),
4471               name->as_C_string(),
4472               signature->as_C_string()
4473             );
4474             return;
4475           }
4476 
4477           // continue to look from super_m's holder's super.
4478           k = super_m->method_holder()->super();
4479           continue;
4480         }
4481 
4482         k = k->super();
4483       }
4484     }
4485   }
4486 }
4487 
4488 
4489 // assumes that this_klass is an interface
4490 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4491   assert(this_klass != NULL, "invariant");
4492   assert(this_klass->is_interface(), "not an interface");
4493   const Array<Method*>* methods = this_klass->methods();
4494   const int num_methods = methods->length();
4495 
4496   for (int index = 0; index < num_methods; index++) {
4497     const Method* const m = methods->at(index);
4498     // if m is static and not the init method, throw a verify error
4499     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4500       ResourceMark rm(THREAD);
4501       Exceptions::fthrow(
4502         THREAD_AND_LOCATION,
4503         vmSymbols::java_lang_VerifyError(),
4504         "Illegal static method %s in interface %s",
4505         m->name()->as_C_string(),
4506         this_klass->external_name()
4507       );
4508       return;
4509     }
4510   }
4511 }
4512 
4513 // utility methods for format checking
4514 
4515 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4516   if (!_need_verify) { return; }
4517 
4518   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4519   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4520   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4521   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4522   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4523   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4524   const bool is_module_info= (flags & JVM_ACC_MODULE)     != 0;
4525   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
4526 
4527   if ((is_abstract && is_final) ||
4528       (is_interface && !is_abstract) ||
4529       (is_interface && major_gte_15 && (is_super || is_enum)) ||
4530       (!is_interface && major_gte_15 && is_annotation) ||
4531       is_module_info) {
4532     ResourceMark rm(THREAD);
4533     Exceptions::fthrow(
4534       THREAD_AND_LOCATION,
4535       vmSymbols::java_lang_ClassFormatError(),
4536       "Illegal class modifiers in class %s: 0x%X",
4537       _class_name->as_C_string(), flags
4538     );
4539     return;
4540   }
4541 }
4542 
4543 static bool has_illegal_visibility(jint flags) {
4544   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4545   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4546   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4547 
4548   return ((is_public && is_protected) ||
4549           (is_public && is_private) ||
4550           (is_protected && is_private));
4551 }
4552 
4553 static bool is_supported_version(u2 major, u2 minor){
4554   const u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4555   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4556          (major <= max_version) &&
4557          ((major != max_version) ||
4558           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4559 }
4560 
4561 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4562                                                    bool is_interface,
4563                                                    TRAPS) const {
4564   if (!_need_verify) { return; }
4565 
4566   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4567   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4568   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4569   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4570   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4571   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4572   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4573   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4574   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4575 
4576   bool is_illegal = false;
4577 
4578   if (is_interface) {
4579     if (!is_public || !is_static || !is_final || is_private ||
4580         is_protected || is_volatile || is_transient ||
4581         (major_gte_15 && is_enum)) {
4582       is_illegal = true;
4583     }
4584   } else { // not interface
4585     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4586       is_illegal = true;
4587     }
4588   }
4589 
4590   if (is_illegal) {
4591     ResourceMark rm(THREAD);
4592     Exceptions::fthrow(
4593       THREAD_AND_LOCATION,
4594       vmSymbols::java_lang_ClassFormatError(),
4595       "Illegal field modifiers in class %s: 0x%X",
4596       _class_name->as_C_string(), flags);
4597     return;
4598   }
4599 }
4600 
4601 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4602                                                     bool is_interface,
4603                                                     const Symbol* name,
4604                                                     TRAPS) const {
4605   if (!_need_verify) { return; }
4606 
4607   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4608   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4609   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4610   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4611   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4612   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4613   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4614   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4615   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4616   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4617   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
4618   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4619   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4620 
4621   bool is_illegal = false;
4622 
4623   if (is_interface) {
4624     if (major_gte_8) {
4625       // Class file version is JAVA_8_VERSION or later Methods of
4626       // interfaces may set any of the flags except ACC_PROTECTED,
4627       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4628       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4629       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4630           (is_native || is_protected || is_final || is_synchronized) ||
4631           // If a specific method of a class or interface has its
4632           // ACC_ABSTRACT flag set, it must not have any of its
4633           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4634           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4635           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4636           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4637           (is_abstract && (is_private || is_static || is_strict))) {
4638         is_illegal = true;
4639       }
4640     } else if (major_gte_15) {
4641       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4642       if (!is_public || is_private || is_protected || is_static || is_final ||
4643           is_synchronized || is_native || !is_abstract || is_strict) {
4644         is_illegal = true;
4645       }
4646     } else {
4647       // Class file version is pre-JAVA_1_5_VERSION
4648       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4649         is_illegal = true;
4650       }
4651     }
4652   } else { // not interface
4653     if (has_illegal_visibility(flags)) {
4654       is_illegal = true;
4655     } else {
4656       if (is_initializer) {
4657         if (is_static || is_final || is_synchronized || is_native ||
4658             is_abstract || (major_gte_15 && is_bridge)) {
4659           is_illegal = true;
4660         }
4661       } else { // not initializer
4662         if (is_abstract) {
4663           if ((is_final || is_native || is_private || is_static ||
4664               (major_gte_15 && (is_synchronized || is_strict)))) {
4665             is_illegal = true;
4666           }
4667         }
4668       }
4669     }
4670   }
4671 
4672   if (is_illegal) {
4673     ResourceMark rm(THREAD);
4674     Exceptions::fthrow(
4675       THREAD_AND_LOCATION,
4676       vmSymbols::java_lang_ClassFormatError(),
4677       "Method %s in class %s has illegal modifiers: 0x%X",
4678       name->as_C_string(), _class_name->as_C_string(), flags);
4679     return;
4680   }
4681 }
4682 
4683 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4684                                         int length,
4685                                         TRAPS) const {
4686   assert(_need_verify, "only called when _need_verify is true");
4687   if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4688     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4689   }
4690 }
4691 
4692 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4693 // In class names, '/' separates unqualified names.  This is verified in this function also.
4694 // Method names also may not contain the characters '<' or '>', unless <init>
4695 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4696 // method.  Because these names have been checked as special cases before
4697 // calling this method in verify_legal_method_name.
4698 //
4699 // This method is also called from the modular system APIs in modules.cpp
4700 // to verify the validity of module and package names.
4701 bool ClassFileParser::verify_unqualified_name(const char* name,
4702                                               unsigned int length,
4703                                               int type) {
4704   for (const char* p = name; p != name + length;) {
4705     jchar ch = *p;
4706     if (ch < 128) {
4707       if (ch == '.') {
4708         // permit '.' in module names unless it's the first char, or
4709         // preceding char is also a '.', or last char is a '.'.
4710         if ((type != ClassFileParser::LegalModule) ||
4711           (p == name) || (*(p-1) == '.') ||
4712           (p == name + length - 1)) {
4713           return false;
4714         }
4715       }
4716       if (ch == ';' || ch == '[' ) {
4717         return false;   // do not permit '.', ';', or '['
4718       }
4719       if (ch == '/') {
4720         // check for '//' or leading or trailing '/' which are not legal
4721         // unqualified name must not be empty
4722         if (type == ClassFileParser::LegalClass) {
4723           if (p == name || p+1 >= name+length || *(p+1) == '/') {
4724            return false;
4725           }
4726         } else {
4727           return false;   // do not permit '/' unless it's class name
4728         }
4729       }
4730       if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) {
4731         return false;   // do not permit '<' or '>' in method names
4732       }
4733       p++;
4734     } else {
4735       char* tmp_p = UTF8::next(p, &ch);
4736       p = tmp_p;
4737     }
4738   }
4739   return true;
4740 }
4741 
4742 // Take pointer to a string. Skip over the longest part of the string that could
4743 // be taken as a fieldname. Allow '/' if slash_ok is true.
4744 // Return a pointer to just past the fieldname.
4745 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4746 // being true, we saw consecutive slashes (meaning we were looking for a
4747 // qualified path but found something that was badly-formed).
4748 static const char* skip_over_field_name(const char* name,
4749                                         bool slash_ok,
4750                                         unsigned int length) {
4751   const char* p;
4752   jboolean last_is_slash = false;
4753   jboolean not_first_ch = false;
4754 
4755   for (p = name; p != name + length; not_first_ch = true) {
4756     const char* old_p = p;
4757     jchar ch = *p;
4758     if (ch < 128) {
4759       p++;
4760       // quick check for ascii
4761       if ((ch >= 'a' && ch <= 'z') ||
4762         (ch >= 'A' && ch <= 'Z') ||
4763         (ch == '_' || ch == '$') ||
4764         (not_first_ch && ch >= '0' && ch <= '9')) {
4765         last_is_slash = false;
4766         continue;
4767       }
4768       if (slash_ok && ch == '/') {
4769         if (last_is_slash) {
4770           return NULL;  // Don't permit consecutive slashes
4771         }
4772         last_is_slash = true;
4773         continue;
4774       }
4775     }
4776     else {
4777       jint unicode_ch;
4778       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4779       p = tmp_p;
4780       last_is_slash = false;
4781       // Check if ch is Java identifier start or is Java identifier part
4782       // 4672820: call java.lang.Character methods directly without generating separate tables.
4783       EXCEPTION_MARK;
4784 
4785       // return value
4786       JavaValue result(T_BOOLEAN);
4787       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4788       JavaCallArguments args;
4789       args.push_int(unicode_ch);
4790 
4791       // public static boolean isJavaIdentifierStart(char ch);
4792       JavaCalls::call_static(&result,
4793         SystemDictionary::Character_klass(),
4794         vmSymbols::isJavaIdentifierStart_name(),
4795         vmSymbols::int_bool_signature(),
4796         &args,
4797         THREAD);
4798 
4799       if (HAS_PENDING_EXCEPTION) {
4800         CLEAR_PENDING_EXCEPTION;
4801         return 0;
4802       }
4803       if (result.get_jboolean()) {
4804         continue;
4805       }
4806 
4807       if (not_first_ch) {
4808         // public static boolean isJavaIdentifierPart(char ch);
4809         JavaCalls::call_static(&result,
4810           SystemDictionary::Character_klass(),
4811           vmSymbols::isJavaIdentifierPart_name(),
4812           vmSymbols::int_bool_signature(),
4813           &args,
4814           THREAD);
4815 
4816         if (HAS_PENDING_EXCEPTION) {
4817           CLEAR_PENDING_EXCEPTION;
4818           return 0;
4819         }
4820 
4821         if (result.get_jboolean()) {
4822           continue;
4823         }
4824       }
4825     }
4826     return (not_first_ch) ? old_p : NULL;
4827   }
4828   return (not_first_ch) ? p : NULL;
4829 }
4830 
4831 // Take pointer to a string. Skip over the longest part of the string that could
4832 // be taken as a field signature. Allow "void" if void_ok.
4833 // Return a pointer to just past the signature.
4834 // Return NULL if no legal signature is found.
4835 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4836                                                        bool void_ok,
4837                                                        unsigned int length,
4838                                                        TRAPS) const {
4839   unsigned int array_dim = 0;
4840   while (length > 0) {
4841     switch (signature[0]) {
4842     case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4843     case JVM_SIGNATURE_BOOLEAN:
4844     case JVM_SIGNATURE_BYTE:
4845     case JVM_SIGNATURE_CHAR:
4846     case JVM_SIGNATURE_SHORT:
4847     case JVM_SIGNATURE_INT:
4848     case JVM_SIGNATURE_FLOAT:
4849     case JVM_SIGNATURE_LONG:
4850     case JVM_SIGNATURE_DOUBLE:
4851       return signature + 1;
4852     case JVM_SIGNATURE_CLASS: {
4853       if (_major_version < JAVA_1_5_VERSION) {
4854         // Skip over the class name if one is there
4855         const char* const p = skip_over_field_name(signature + 1, true, --length);
4856 
4857         // The next character better be a semicolon
4858         if (p && (p - signature) > 1 && p[0] == ';') {
4859           return p + 1;
4860         }
4861       }
4862       else {
4863         // Skip leading 'L' and ignore first appearance of ';'
4864         length--;
4865         signature++;
4866         char* c = strchr((char*) signature, ';');
4867         // Format check signature
4868         if (c != NULL) {
4869           ResourceMark rm(THREAD);
4870           int newlen = c - (char*) signature;
4871           char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1);
4872           strncpy(sig, signature, newlen);
4873           sig[newlen] = '\0';
4874 
4875           bool legal = verify_unqualified_name(sig, newlen, LegalClass);
4876           if (!legal) {
4877             classfile_parse_error("Class name contains illegal character "
4878                                   "in descriptor in class file %s",
4879                                   CHECK_0);
4880             return NULL;
4881           }
4882           return signature + newlen + 1;
4883         }
4884       }
4885       return NULL;
4886     }
4887     case JVM_SIGNATURE_ARRAY:
4888       array_dim++;
4889       if (array_dim > 255) {
4890         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4891         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4892       }
4893       // The rest of what's there better be a legal signature
4894       signature++;
4895       length--;
4896       void_ok = false;
4897       break;
4898     default:
4899       return NULL;
4900     }
4901   }
4902   return NULL;
4903 }
4904 
4905 // Checks if name is a legal class name.
4906 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4907   if (!_need_verify || _relax_verify) { return; }
4908 
4909   char buf[fixed_buffer_size];
4910   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4911   unsigned int length = name->utf8_length();
4912   bool legal = false;
4913 
4914   if (length > 0) {
4915     const char* p;
4916     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4917       p = skip_over_field_signature(bytes, false, length, CHECK);
4918       legal = (p != NULL) && ((p - bytes) == (int)length);
4919     } else if (_major_version < JAVA_1_5_VERSION) {
4920       if (bytes[0] != '<') {
4921         p = skip_over_field_name(bytes, true, length);
4922         legal = (p != NULL) && ((p - bytes) == (int)length);
4923       }
4924     } else {
4925       // 4900761: relax the constraints based on JSR202 spec
4926       // Class names may be drawn from the entire Unicode character set.
4927       // Identifiers between '/' must be unqualified names.
4928       // The utf8 string has been verified when parsing cpool entries.
4929       legal = verify_unqualified_name(bytes, length, LegalClass);
4930     }
4931   }
4932   if (!legal) {
4933     ResourceMark rm(THREAD);
4934     assert(_class_name != NULL, "invariant");
4935     Exceptions::fthrow(
4936       THREAD_AND_LOCATION,
4937       vmSymbols::java_lang_ClassFormatError(),
4938       "Illegal class name \"%s\" in class file %s", bytes,
4939       _class_name->as_C_string()
4940     );
4941     return;
4942   }
4943 }
4944 
4945 // Checks if name is a legal field name.
4946 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4947   if (!_need_verify || _relax_verify) { return; }
4948 
4949   char buf[fixed_buffer_size];
4950   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4951   unsigned int length = name->utf8_length();
4952   bool legal = false;
4953 
4954   if (length > 0) {
4955     if (_major_version < JAVA_1_5_VERSION) {
4956       if (bytes[0] != '<') {
4957         const char* p = skip_over_field_name(bytes, false, length);
4958         legal = (p != NULL) && ((p - bytes) == (int)length);
4959       }
4960     } else {
4961       // 4881221: relax the constraints based on JSR202 spec
4962       legal = verify_unqualified_name(bytes, length, LegalField);
4963     }
4964   }
4965 
4966   if (!legal) {
4967     ResourceMark rm(THREAD);
4968     assert(_class_name != NULL, "invariant");
4969     Exceptions::fthrow(
4970       THREAD_AND_LOCATION,
4971       vmSymbols::java_lang_ClassFormatError(),
4972       "Illegal field name \"%s\" in class %s", bytes,
4973       _class_name->as_C_string()
4974     );
4975     return;
4976   }
4977 }
4978 
4979 // Checks if name is a legal method name.
4980 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4981   if (!_need_verify || _relax_verify) { return; }
4982 
4983   assert(name != NULL, "method name is null");
4984   char buf[fixed_buffer_size];
4985   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4986   unsigned int length = name->utf8_length();
4987   bool legal = false;
4988 
4989   if (length > 0) {
4990     if (bytes[0] == '<') {
4991       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4992         legal = true;
4993       }
4994     } else if (_major_version < JAVA_1_5_VERSION) {
4995       const char* p;
4996       p = skip_over_field_name(bytes, false, length);
4997       legal = (p != NULL) && ((p - bytes) == (int)length);
4998     } else {
4999       // 4881221: relax the constraints based on JSR202 spec
5000       legal = verify_unqualified_name(bytes, length, LegalMethod);
5001     }
5002   }
5003 
5004   if (!legal) {
5005     ResourceMark rm(THREAD);
5006     assert(_class_name != NULL, "invariant");
5007     Exceptions::fthrow(
5008       THREAD_AND_LOCATION,
5009       vmSymbols::java_lang_ClassFormatError(),
5010       "Illegal method name \"%s\" in class %s", bytes,
5011       _class_name->as_C_string()
5012     );
5013     return;
5014   }
5015 }
5016 
5017 
5018 // Checks if signature is a legal field signature.
5019 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5020                                                    const Symbol* signature,
5021                                                    TRAPS) const {
5022   if (!_need_verify) { return; }
5023 
5024   char buf[fixed_buffer_size];
5025   const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5026   const unsigned int length = signature->utf8_length();
5027   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5028 
5029   if (p == NULL || (p - bytes) != (int)length) {
5030     throwIllegalSignature("Field", name, signature, CHECK);
5031   }
5032 }
5033 
5034 // Checks if signature is a legal method signature.
5035 // Returns number of parameters
5036 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5037                                                    const Symbol* signature,
5038                                                    TRAPS) const {
5039   if (!_need_verify) {
5040     // make sure caller's args_size will be less than 0 even for non-static
5041     // method so it will be recomputed in compute_size_of_parameters().
5042     return -2;
5043   }
5044 
5045   // Class initializers cannot have args for class format version >= 51.
5046   if (name == vmSymbols::class_initializer_name() &&
5047       signature != vmSymbols::void_method_signature() &&
5048       _major_version >= JAVA_7_VERSION) {
5049     throwIllegalSignature("Method", name, signature, CHECK_0);
5050     return 0;
5051   }
5052 
5053   unsigned int args_size = 0;
5054   char buf[fixed_buffer_size];
5055   const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5056   unsigned int length = signature->utf8_length();
5057   const char* nextp;
5058 
5059   // The first character must be a '('
5060   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5061     length--;
5062     // Skip over legal field signatures
5063     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5064     while ((length > 0) && (nextp != NULL)) {
5065       args_size++;
5066       if (p[0] == 'J' || p[0] == 'D') {
5067         args_size++;
5068       }
5069       length -= nextp - p;
5070       p = nextp;
5071       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5072     }
5073     // The first non-signature thing better be a ')'
5074     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5075       length--;
5076       if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5077         // All internal methods must return void
5078         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5079           return args_size;
5080         }
5081       } else {
5082         // Now we better just have a return value
5083         nextp = skip_over_field_signature(p, true, length, CHECK_0);
5084         if (nextp && ((int)length == (nextp - p))) {
5085           return args_size;
5086         }
5087       }
5088     }
5089   }
5090   // Report error
5091   throwIllegalSignature("Method", name, signature, CHECK_0);
5092   return 0;
5093 }
5094 
5095 int ClassFileParser::static_field_size() const {
5096   assert(_field_info != NULL, "invariant");
5097   return _field_info->static_field_size;
5098 }
5099 
5100 int ClassFileParser::total_oop_map_count() const {
5101   assert(_field_info != NULL, "invariant");
5102   return _field_info->total_oop_map_count;
5103 }
5104 
5105 jint ClassFileParser::layout_size() const {
5106   assert(_field_info != NULL, "invariant");
5107   return _field_info->instance_size;
5108 }
5109 
5110 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5111                                          const Array<Method*>* methods) {
5112   assert(ik != NULL, "invariant");
5113   assert(methods != NULL, "invariant");
5114 
5115   // Set up Method*::intrinsic_id as soon as we know the names of methods.
5116   // (We used to do this lazily, but now we query it in Rewriter,
5117   // which is eagerly done for every method, so we might as well do it now,
5118   // when everything is fresh in memory.)
5119   const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5120 
5121   if (klass_id != vmSymbols::NO_SID) {
5122     for (int j = 0; j < methods->length(); ++j) {
5123       Method* method = methods->at(j);
5124       method->init_intrinsic_id();
5125 
5126       if (CheckIntrinsics) {
5127         // Check if an intrinsic is defined for method 'method',
5128         // but the method is not annotated with @HotSpotIntrinsicCandidate.
5129         if (method->intrinsic_id() != vmIntrinsics::_none &&
5130             !method->intrinsic_candidate()) {
5131               tty->print("Compiler intrinsic is defined for method [%s], "
5132               "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5133               method->name_and_sig_as_C_string(),
5134               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5135             );
5136           tty->cr();
5137           DEBUG_ONLY(vm_exit(1));
5138         }
5139         // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5140         // but there is no intrinsic available for it.
5141         if (method->intrinsic_candidate() &&
5142           method->intrinsic_id() == vmIntrinsics::_none) {
5143             tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5144               "but no compiler intrinsic is defined for the method.%s",
5145               method->name_and_sig_as_C_string(),
5146               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5147             );
5148           tty->cr();
5149           DEBUG_ONLY(vm_exit(1));
5150         }
5151       }
5152     } // end for
5153 
5154 #ifdef ASSERT
5155     if (CheckIntrinsics) {
5156       // Check for orphan methods in the current class. A method m
5157       // of a class C is orphan if an intrinsic is defined for method m,
5158       // but class C does not declare m.
5159       // The check is potentially expensive, therefore it is available
5160       // only in debug builds.
5161 
5162       for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5163         if (vmIntrinsics::_compiledLambdaForm == id) {
5164           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5165           // generated for the JVM from a LambdaForm and therefore no method
5166           // is defined for it.
5167           continue;
5168         }
5169 
5170         if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5171           // Check if the current class contains a method with the same
5172           // name, flags, signature.
5173           bool match = false;
5174           for (int j = 0; j < methods->length(); ++j) {
5175             const Method* method = methods->at(j);
5176             if (method->intrinsic_id() == id) {
5177               match = true;
5178               break;
5179             }
5180           }
5181 
5182           if (!match) {
5183             char buf[1000];
5184             tty->print("Compiler intrinsic is defined for method [%s], "
5185                        "but the method is not available in class [%s].%s",
5186                         vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5187                                                              buf, sizeof(buf)),
5188                         ik->name()->as_C_string(),
5189                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5190             );
5191             tty->cr();
5192             DEBUG_ONLY(vm_exit(1));
5193           }
5194         }
5195       } // end for
5196     } // CheckIntrinsics
5197 #endif // ASSERT
5198   }
5199 }
5200 
5201 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) {
5202   if (_klass != NULL) {
5203     return _klass;
5204   }
5205 
5206   InstanceKlass* const ik =
5207     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5208 
5209   fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL);
5210 
5211   assert(_klass == ik, "invariant");
5212 
5213   return ik;
5214 }
5215 
5216 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) {
5217   assert(ik != NULL, "invariant");
5218 
5219   set_klass_to_deallocate(ik);
5220 
5221   assert(_field_info != NULL, "invariant");
5222   assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5223   assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5224     "sanity");
5225 
5226   assert(ik->is_instance_klass(), "sanity");
5227   assert(ik->size_helper() == _field_info->instance_size, "sanity");
5228 
5229   // Fill in information already parsed
5230   ik->set_should_verify_class(_need_verify);
5231 
5232   // Not yet: supers are done below to support the new subtype-checking fields
5233   ik->set_class_loader_data(_loader_data);
5234   ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5235   ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5236   assert(_fac != NULL, "invariant");
5237   ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5238 
5239   // this transfers ownership of a lot of arrays from
5240   // the parser onto the InstanceKlass*
5241   apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5242 
5243   // note that is not safe to use the fields in the parser from this point on
5244   assert(NULL == _cp, "invariant");
5245   assert(NULL == _fields, "invariant");
5246   assert(NULL == _methods, "invariant");
5247   assert(NULL == _inner_classes, "invariant");
5248   assert(NULL == _local_interfaces, "invariant");
5249   assert(NULL == _transitive_interfaces, "invariant");
5250   assert(NULL == _combined_annotations, "invariant");
5251 
5252   if (_has_final_method) {
5253     ik->set_has_final_method();
5254   }
5255 
5256   ik->copy_method_ordering(_method_ordering, CHECK);
5257   // The InstanceKlass::_methods_jmethod_ids cache
5258   // is managed on the assumption that the initial cache
5259   // size is equal to the number of methods in the class. If
5260   // that changes, then InstanceKlass::idnum_can_increment()
5261   // has to be changed accordingly.
5262   ik->set_initial_method_idnum(ik->methods()->length());
5263 
5264   ik->set_name(_class_name);
5265 
5266   if (is_anonymous()) {
5267     // I am well known to myself
5268     ik->constants()->klass_at_put(_this_class_index, ik); // eagerly resolve
5269   }
5270 
5271   ik->set_minor_version(_minor_version);
5272   ik->set_major_version(_major_version);
5273   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5274   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5275 
5276   if (_host_klass != NULL) {
5277     assert (ik->is_anonymous(), "should be the same");
5278     ik->set_host_klass(_host_klass);
5279   }
5280 
5281   // Set PackageEntry for this_klass
5282   oop cl = ik->class_loader();
5283   Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5284   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5285   ik->set_package(cld, CHECK);
5286 
5287   const Array<Method*>* const methods = ik->methods();
5288   assert(methods != NULL, "invariant");
5289   const int methods_len = methods->length();
5290 
5291   check_methods_for_intrinsics(ik, methods);
5292 
5293   // Fill in field values obtained by parse_classfile_attributes
5294   if (_parsed_annotations->has_any_annotations()) {
5295     _parsed_annotations->apply_to(ik);
5296   }
5297 
5298   apply_parsed_class_attributes(ik);
5299 
5300   // Miranda methods
5301   if ((_num_miranda_methods > 0) ||
5302       // if this class introduced new miranda methods or
5303       (_super_klass != NULL && _super_klass->has_miranda_methods())
5304         // super class exists and this class inherited miranda methods
5305      ) {
5306        ik->set_has_miranda_methods(); // then set a flag
5307   }
5308 
5309   // Fill in information needed to compute superclasses.
5310   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5311 
5312   // Initialize itable offset tables
5313   klassItable::setup_itable_offset_table(ik);
5314 
5315   // Compute transitive closure of interfaces this class implements
5316   // Do final class setup
5317   fill_oop_maps(ik,
5318                 _field_info->nonstatic_oop_map_count,
5319                 _field_info->nonstatic_oop_offsets,
5320                 _field_info->nonstatic_oop_counts);
5321 
5322   // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5323   set_precomputed_flags(ik);
5324 
5325   // check if this class can access its super class
5326   check_super_class_access(ik, CHECK);
5327 
5328   // check if this class can access its superinterfaces
5329   check_super_interface_access(ik, CHECK);
5330 
5331   // check if this class overrides any final method
5332   check_final_method_override(ik, CHECK);
5333 
5334   // reject static interface methods prior to Java 8
5335   if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5336     check_illegal_static_method(ik, CHECK);
5337   }
5338 
5339   // Obtain this_klass' module entry
5340   ModuleEntry* module_entry = ik->module();
5341   assert(module_entry != NULL, "module_entry should always be set");
5342 
5343   // Obtain java.lang.reflect.Module
5344   Handle module_handle(THREAD, JNIHandles::resolve(module_entry->module()));
5345 
5346   // Allocate mirror and initialize static fields
5347   // The create_mirror() call will also call compute_modifiers()
5348   java_lang_Class::create_mirror(ik,
5349                                  _loader_data->class_loader(),
5350                                  module_handle,
5351                                  _protection_domain,
5352                                  CHECK);
5353 
5354   assert(_all_mirandas != NULL, "invariant");
5355 
5356   // Generate any default methods - default methods are public interface methods
5357   // that have a default implementation.  This is new with Java 8.
5358   if (_has_nonstatic_concrete_methods) {
5359     DefaultMethods::generate_default_methods(ik,
5360                                              _all_mirandas,
5361                                              CHECK);
5362   }
5363 
5364   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5365   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5366       !module_entry->has_default_read_edges()) {
5367     if (!module_entry->set_has_default_read_edges()) {
5368       // We won a potential race
5369       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5370     }
5371   }
5372 
5373   // Update the loader_data graph.
5374   record_defined_class_dependencies(ik, CHECK);
5375 
5376   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5377 
5378   if (!is_internal()) {
5379     if (log_is_enabled(Info, class, load)) {
5380       ResourceMark rm;
5381       const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
5382 
5383       if (log_is_enabled(Info, class, load)) {
5384         ik->print_loading_log(LogLevel::Info, _loader_data, module_name, _stream);
5385       }
5386       // No 'else' here as logging levels are not mutually exclusive
5387       if (log_is_enabled(Debug, class, load)) {
5388         ik->print_loading_log(LogLevel::Debug, _loader_data, module_name, _stream);
5389       }
5390     }
5391 
5392     if (log_is_enabled(Debug, class, resolve))  {
5393       ResourceMark rm;
5394       // print out the superclass.
5395       const char * from = ik->external_name();
5396       if (ik->java_super() != NULL) {
5397         log_debug(class, resolve)("%s %s (super)",
5398                    from,
5399                    ik->java_super()->external_name());
5400       }
5401       // print out each of the interface classes referred to by this class.
5402       const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5403       if (local_interfaces != NULL) {
5404         const int length = local_interfaces->length();
5405         for (int i = 0; i < length; i++) {
5406           const Klass* const k = local_interfaces->at(i);
5407           const char * to = k->external_name();
5408           log_debug(class, resolve)("%s %s (interface)", from, to);
5409         }
5410       }
5411     }
5412   }
5413 
5414   TRACE_INIT_KLASS_ID(ik);
5415 
5416   // If we reach here, all is well.
5417   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5418   // in order for it to not be destroyed in the ClassFileParser destructor.
5419   set_klass_to_deallocate(NULL);
5420 
5421   // it's official
5422   set_klass(ik);
5423 
5424   debug_only(ik->verify();)
5425 }
5426 
5427 // For an anonymous class that is in the unnamed package, move it to its host class's
5428 // package by prepending its host class's package name to its class name and setting
5429 // its _class_name field.
5430 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) {
5431   ResourceMark rm(THREAD);
5432   assert(strrchr(_class_name->as_C_string(), '/') == NULL,
5433          "Anonymous class should not be in a package");
5434   const char* host_pkg_name =
5435     ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL);
5436 
5437   if (host_pkg_name != NULL) {
5438     size_t host_pkg_len = strlen(host_pkg_name);
5439     int class_name_len = _class_name->utf8_length();
5440     char* new_anon_name =
5441       NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len);
5442     // Copy host package name and trailing /.
5443     strncpy(new_anon_name, host_pkg_name, host_pkg_len);
5444     new_anon_name[host_pkg_len] = '/';
5445     // Append anonymous class name. The anonymous class name can contain odd
5446     // characters.  So, do a strncpy instead of using sprintf("%s...").
5447     strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len);
5448 
5449     // Create a symbol and update the anonymous class name.
5450     _class_name = SymbolTable::new_symbol(new_anon_name,
5451                                           (int)host_pkg_len + 1 + class_name_len,
5452                                           CHECK);
5453   }
5454 }
5455 
5456 // If the host class and the anonymous class are in the same package then do
5457 // nothing.  If the anonymous class is in the unnamed package then move it to its
5458 // host's package.  If the classes are in different packages then throw an IAE
5459 // exception.
5460 void ClassFileParser::fix_anonymous_class_name(TRAPS) {
5461   assert(_host_klass != NULL, "Expected an anonymous class");
5462 
5463   const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(),
5464                                                _class_name->utf8_length(), '/');
5465   if (anon_last_slash == NULL) {  // Unnamed package
5466     prepend_host_package_name(_host_klass, CHECK);
5467   } else {
5468     if (!InstanceKlass::is_same_class_package(_host_klass->class_loader(),
5469                                               _host_klass->name(),
5470                                               _host_klass->class_loader(),
5471                                               _class_name)) {
5472       ResourceMark rm(THREAD);
5473       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
5474         err_msg("Host class %s and anonymous class %s are in different packages",
5475         _host_klass->name()->as_C_string(), _class_name->as_C_string()));
5476     }
5477   }
5478 }
5479 
5480 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5481   bool trusted = (loader_data->is_the_null_class_loader_data() ||
5482                   SystemDictionary::is_platform_class_loader(loader_data->class_loader()));
5483   bool need_verify =
5484     // verifyAll
5485     (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5486     // verifyRemote
5487     (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5488   return !need_verify;
5489 }
5490 
5491 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5492                                  Symbol* name,
5493                                  ClassLoaderData* loader_data,
5494                                  Handle protection_domain,
5495                                  const InstanceKlass* host_klass,
5496                                  GrowableArray<Handle>* cp_patches,
5497                                  Publicity pub_level,
5498                                  TRAPS) :
5499   _stream(stream),
5500   _requested_name(name),
5501   _loader_data(loader_data),
5502   _host_klass(host_klass),
5503   _cp_patches(cp_patches),
5504   _super_klass(),
5505   _cp(NULL),
5506   _fields(NULL),
5507   _methods(NULL),
5508   _inner_classes(NULL),
5509   _local_interfaces(NULL),
5510   _transitive_interfaces(NULL),
5511   _combined_annotations(NULL),
5512   _annotations(NULL),
5513   _type_annotations(NULL),
5514   _fields_annotations(NULL),
5515   _fields_type_annotations(NULL),
5516   _klass(NULL),
5517   _klass_to_deallocate(NULL),
5518   _parsed_annotations(NULL),
5519   _fac(NULL),
5520   _field_info(NULL),
5521   _method_ordering(NULL),
5522   _all_mirandas(NULL),
5523   _vtable_size(0),
5524   _itable_size(0),
5525   _num_miranda_methods(0),
5526   _rt(REF_NONE),
5527   _protection_domain(protection_domain),
5528   _access_flags(),
5529   _pub_level(pub_level),
5530   _synthetic_flag(false),
5531   _sde_length(false),
5532   _sde_buffer(NULL),
5533   _sourcefile_index(0),
5534   _generic_signature_index(0),
5535   _major_version(0),
5536   _minor_version(0),
5537   _this_class_index(0),
5538   _super_class_index(0),
5539   _itfs_len(0),
5540   _java_fields_count(0),
5541   _need_verify(false),
5542   _relax_verify(false),
5543   _has_nonstatic_concrete_methods(false),
5544   _declares_nonstatic_concrete_methods(false),
5545   _has_final_method(false),
5546   _has_finalizer(false),
5547   _has_empty_finalizer(false),
5548   _has_vanilla_constructor(false),
5549   _max_bootstrap_specifier_index(-1) {
5550 
5551   _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5552 
5553   assert(THREAD->is_Java_thread(), "invariant");
5554   assert(_loader_data != NULL, "invariant");
5555   assert(stream != NULL, "invariant");
5556   assert(_stream != NULL, "invariant");
5557   assert(_stream->buffer() == _stream->current(), "invariant");
5558   assert(_class_name != NULL, "invariant");
5559   assert(0 == _access_flags.as_int(), "invariant");
5560 
5561   // Figure out whether we can skip format checking (matching classic VM behavior)
5562   if (DumpSharedSpaces) {
5563     // verify == true means it's a 'remote' class (i.e., non-boot class)
5564     // Verification decision is based on BytecodeVerificationRemote flag
5565     // for those classes.
5566     _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5567                                               BytecodeVerificationLocal;
5568   }
5569   else {
5570     _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5571                                                stream->need_verify());
5572   }
5573 
5574   // synch back verification state to stream
5575   stream->set_verify(_need_verify);
5576 
5577   // Check if verification needs to be relaxed for this class file
5578   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5579   _relax_verify = relax_format_check_for(_loader_data);
5580 
5581   parse_stream(stream, CHECK);
5582 
5583   post_process_parsed_stream(stream, _cp, CHECK);
5584 }
5585 
5586 void ClassFileParser::clear_class_metadata() {
5587   // metadata created before the instance klass is created.  Must be
5588   // deallocated if classfile parsing returns an error.
5589   _cp = NULL;
5590   _fields = NULL;
5591   _methods = NULL;
5592   _inner_classes = NULL;
5593   _local_interfaces = NULL;
5594   _transitive_interfaces = NULL;
5595   _combined_annotations = NULL;
5596   _annotations = _type_annotations = NULL;
5597   _fields_annotations = _fields_type_annotations = NULL;
5598 }
5599 
5600 // Destructor to clean up
5601 ClassFileParser::~ClassFileParser() {
5602   if (_cp != NULL) {
5603     MetadataFactory::free_metadata(_loader_data, _cp);
5604   }
5605   if (_fields != NULL) {
5606     MetadataFactory::free_array<u2>(_loader_data, _fields);
5607   }
5608 
5609   if (_methods != NULL) {
5610     // Free methods
5611     InstanceKlass::deallocate_methods(_loader_data, _methods);
5612   }
5613 
5614   // beware of the Universe::empty_blah_array!!
5615   if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5616     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5617   }
5618 
5619   // Free interfaces
5620   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5621                                        _local_interfaces, _transitive_interfaces);
5622 
5623   if (_combined_annotations != NULL) {
5624     // After all annotations arrays have been created, they are installed into the
5625     // Annotations object that will be assigned to the InstanceKlass being created.
5626 
5627     // Deallocate the Annotations object and the installed annotations arrays.
5628     _combined_annotations->deallocate_contents(_loader_data);
5629 
5630     // If the _combined_annotations pointer is non-NULL,
5631     // then the other annotations fields should have been cleared.
5632     assert(_annotations             == NULL, "Should have been cleared");
5633     assert(_type_annotations        == NULL, "Should have been cleared");
5634     assert(_fields_annotations      == NULL, "Should have been cleared");
5635     assert(_fields_type_annotations == NULL, "Should have been cleared");
5636   } else {
5637     // If the annotations arrays were not installed into the Annotations object,
5638     // then they have to be deallocated explicitly.
5639     MetadataFactory::free_array<u1>(_loader_data, _annotations);
5640     MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5641     Annotations::free_contents(_loader_data, _fields_annotations);
5642     Annotations::free_contents(_loader_data, _fields_type_annotations);
5643   }
5644 
5645   clear_class_metadata();
5646 
5647   // deallocate the klass if already created.  Don't directly deallocate, but add
5648   // to the deallocate list so that the klass is removed from the CLD::_klasses list
5649   // at a safepoint.
5650   if (_klass_to_deallocate != NULL) {
5651     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5652   }
5653 }
5654 
5655 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5656                                    TRAPS) {
5657 
5658   assert(stream != NULL, "invariant");
5659   assert(_class_name != NULL, "invariant");
5660 
5661   // BEGIN STREAM PARSING
5662   stream->guarantee_more(8, CHECK);  // magic, major, minor
5663   // Magic value
5664   const u4 magic = stream->get_u4_fast();
5665   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5666                      "Incompatible magic value %u in class file %s",
5667                      magic, CHECK);
5668 
5669   // Version numbers
5670   _minor_version = stream->get_u2_fast();
5671   _major_version = stream->get_u2_fast();
5672 
5673   if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5674     ResourceMark rm;
5675     warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5676             _major_version,  _minor_version, _class_name->as_C_string());
5677     Exceptions::fthrow(
5678       THREAD_AND_LOCATION,
5679       vmSymbols::java_lang_UnsupportedClassVersionError(),
5680       "Unsupported major.minor version for dump time %u.%u",
5681       _major_version,
5682       _minor_version);
5683   }
5684 
5685   // Check version numbers - we check this even with verifier off
5686   if (!is_supported_version(_major_version, _minor_version)) {
5687     ResourceMark rm(THREAD);
5688     Exceptions::fthrow(
5689       THREAD_AND_LOCATION,
5690       vmSymbols::java_lang_UnsupportedClassVersionError(),
5691       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5692       "this version of the Java Runtime only recognizes class file versions up to %u.%u",
5693       _class_name->as_C_string(),
5694       _major_version,
5695       _minor_version,
5696       JAVA_MAX_SUPPORTED_VERSION,
5697       JAVA_MAX_SUPPORTED_MINOR_VERSION);
5698     return;
5699   }
5700 
5701   stream->guarantee_more(3, CHECK); // length, first cp tag
5702   const u2 cp_size = stream->get_u2_fast();
5703 
5704   guarantee_property(
5705     cp_size >= 1, "Illegal constant pool size %u in class file %s",
5706     cp_size, CHECK);
5707 
5708   _cp = ConstantPool::allocate(_loader_data,
5709                                cp_size,
5710                                CHECK);
5711 
5712   ConstantPool* const cp = _cp;
5713 
5714   parse_constant_pool(stream, cp, cp_size, CHECK);
5715 
5716   assert(cp_size == (const u2)cp->length(), "invariant");
5717 
5718   // ACCESS FLAGS
5719   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
5720 
5721   // Access flags
5722   jint flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5723 
5724   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5725     // Set abstract bit for old class files for backward compatibility
5726     flags |= JVM_ACC_ABSTRACT;
5727   }
5728 
5729   _access_flags.set_flags(flags);
5730 
5731   verify_legal_class_modifiers((jint)_access_flags.as_int(), CHECK);
5732 
5733   // This class and superclass
5734   _this_class_index = stream->get_u2_fast();
5735   check_property(
5736     valid_cp_range(_this_class_index, cp_size) &&
5737       cp->tag_at(_this_class_index).is_unresolved_klass(),
5738     "Invalid this class index %u in constant pool in class file %s",
5739     _this_class_index, CHECK);
5740 
5741   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5742   assert(class_name_in_cp != NULL, "class_name can't be null");
5743 
5744   // Update _class_name which could be null previously
5745   // to reflect the name in the constant pool
5746   _class_name = class_name_in_cp;
5747 
5748   // Don't need to check whether this class name is legal or not.
5749   // It has been checked when constant pool is parsed.
5750   // However, make sure it is not an array type.
5751   if (_need_verify) {
5752     guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5753                        "Bad class name in class file %s",
5754                        CHECK);
5755   }
5756 
5757   // Checks if name in class file matches requested name
5758   if (_requested_name != NULL && _requested_name != _class_name) {
5759     ResourceMark rm(THREAD);
5760     Exceptions::fthrow(
5761       THREAD_AND_LOCATION,
5762       vmSymbols::java_lang_NoClassDefFoundError(),
5763       "%s (wrong name: %s)",
5764       _class_name->as_C_string(),
5765       _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
5766     );
5767     return;
5768   }
5769 
5770   // if this is an anonymous class fix up its name if it's in the unnamed
5771   // package.  Otherwise, throw IAE if it is in a different package than
5772   // its host class.
5773   if (_host_klass != NULL) {
5774     fix_anonymous_class_name(CHECK);
5775   }
5776 
5777   // Verification prevents us from creating names with dots in them, this
5778   // asserts that that's the case.
5779   assert(is_internal_format(_class_name), "external class name format used internally");
5780 
5781   if (!is_internal()) {
5782     if (log_is_enabled(Debug, class, preorder)){
5783       ResourceMark rm(THREAD);
5784       outputStream* log = Log(class, preorder)::debug_stream();
5785       log->print("%s", _class_name->as_klass_external_name());
5786       if (stream->source() != NULL) {
5787         log->print(" source: %s", stream->source());
5788       }
5789       log->cr();
5790     }
5791 
5792 #if INCLUDE_CDS
5793     if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
5794       // Only dump the classes that can be stored into CDS archive.
5795       // Anonymous classes such as generated LambdaForm classes are also not included.
5796       if (SystemDictionaryShared::is_sharing_possible(_loader_data) &&
5797           _host_klass == NULL) {
5798         oop class_loader = _loader_data->class_loader();
5799         ResourceMark rm(THREAD);
5800         // For the boot and platform class loaders, check if the class is not found in the
5801         // java runtime image. Additional check for the boot class loader is if the class
5802         // is not found in the boot loader's appended entries. This indicates that the class
5803         // is not useable during run time, such as the ones found in the --patch-module entries,
5804         // so it should not be included in the classlist file.
5805         if (((class_loader == NULL && !ClassLoader::contains_append_entry(stream->source())) ||
5806              SystemDictionary::is_platform_class_loader(class_loader)) &&
5807             !ClassLoader::is_jrt(stream->source())) {
5808           tty->print_cr("skip writing class %s from source %s to classlist file",
5809             _class_name->as_C_string(), stream->source());
5810         } else {
5811           classlist_file->print_cr("%s", _class_name->as_C_string());
5812           classlist_file->flush();
5813         }
5814       }
5815     }
5816 #endif
5817   }
5818 
5819   // SUPERKLASS
5820   _super_class_index = stream->get_u2_fast();
5821   _super_klass = parse_super_class(cp,
5822                                    _super_class_index,
5823                                    _need_verify,
5824                                    CHECK);
5825 
5826   // Interfaces
5827   _itfs_len = stream->get_u2_fast();
5828   parse_interfaces(stream,
5829                    _itfs_len,
5830                    cp,
5831                    &_has_nonstatic_concrete_methods,
5832                    CHECK);
5833 
5834   assert(_local_interfaces != NULL, "invariant");
5835 
5836   // Fields (offsets are filled in later)
5837   _fac = new FieldAllocationCount();
5838   parse_fields(stream,
5839                _access_flags.is_interface(),
5840                _fac,
5841                cp,
5842                cp_size,
5843                &_java_fields_count,
5844                CHECK);
5845 
5846   assert(_fields != NULL, "invariant");
5847 
5848   // Methods
5849   AccessFlags promoted_flags;
5850   parse_methods(stream,
5851                 _access_flags.is_interface(),
5852                 &promoted_flags,
5853                 &_has_final_method,
5854                 &_declares_nonstatic_concrete_methods,
5855                 CHECK);
5856 
5857   assert(_methods != NULL, "invariant");
5858 
5859   // promote flags from parse_methods() to the klass' flags
5860   _access_flags.add_promoted_flags(promoted_flags.as_int());
5861 
5862   if (_declares_nonstatic_concrete_methods) {
5863     _has_nonstatic_concrete_methods = true;
5864   }
5865 
5866   // Additional attributes/annotations
5867   _parsed_annotations = new ClassAnnotationCollector();
5868   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5869 
5870   assert(_inner_classes != NULL, "invariant");
5871 
5872   // Finalize the Annotations metadata object,
5873   // now that all annotation arrays have been created.
5874   create_combined_annotations(CHECK);
5875 
5876   // Make sure this is the end of class file stream
5877   guarantee_property(stream->at_eos(),
5878                      "Extra bytes at the end of class file %s",
5879                      CHECK);
5880 
5881   // all bytes in stream read and parsed
5882 }
5883 
5884 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5885                                                  ConstantPool* cp,
5886                                                  TRAPS) {
5887   assert(stream != NULL, "invariant");
5888   assert(stream->at_eos(), "invariant");
5889   assert(cp != NULL, "invariant");
5890   assert(_loader_data != NULL, "invariant");
5891 
5892   if (_class_name == vmSymbols::java_lang_Object()) {
5893     check_property(_local_interfaces == Universe::the_empty_klass_array(),
5894                    "java.lang.Object cannot implement an interface in class file %s",
5895                    CHECK);
5896   }
5897   // We check super class after class file is parsed and format is checked
5898   if (_super_class_index > 0 && NULL ==_super_klass) {
5899     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5900     if (_access_flags.is_interface()) {
5901       // Before attempting to resolve the superclass, check for class format
5902       // errors not checked yet.
5903       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5904         "Interfaces must have java.lang.Object as superclass in class file %s",
5905         CHECK);
5906     }
5907     _super_klass = (const InstanceKlass*)
5908                        SystemDictionary::resolve_super_or_fail(_class_name,
5909                                                                super_class_name,
5910                                                                _loader_data->class_loader(),
5911                                                                _protection_domain,
5912                                                                true,
5913                                                                CHECK);
5914   }
5915 
5916   if (_super_klass != NULL) {
5917     if (_super_klass->has_nonstatic_concrete_methods()) {
5918       _has_nonstatic_concrete_methods = true;
5919     }
5920 
5921     if (_super_klass->is_interface()) {
5922       ResourceMark rm(THREAD);
5923       Exceptions::fthrow(
5924         THREAD_AND_LOCATION,
5925         vmSymbols::java_lang_IncompatibleClassChangeError(),
5926         "class %s has interface %s as super class",
5927         _class_name->as_klass_external_name(),
5928         _super_klass->external_name()
5929       );
5930       return;
5931     }
5932     // Make sure super class is not final
5933     if (_super_klass->is_final()) {
5934       THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
5935     }
5936   }
5937 
5938   // Compute the transitive list of all unique interfaces implemented by this class
5939   _transitive_interfaces =
5940     compute_transitive_interfaces(_super_klass,
5941                                   _local_interfaces,
5942                                   _loader_data,
5943                                   CHECK);
5944 
5945   assert(_transitive_interfaces != NULL, "invariant");
5946 
5947   // sort methods
5948   _method_ordering = sort_methods(_methods);
5949 
5950   _all_mirandas = new GrowableArray<Method*>(20);
5951 
5952   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5953                                                     &_num_miranda_methods,
5954                                                     _all_mirandas,
5955                                                     _super_klass,
5956                                                     _methods,
5957                                                     _access_flags,
5958                                                     _major_version,
5959                                                     _loader_data->class_loader(),
5960                                                     _class_name,
5961                                                     _local_interfaces,
5962                                                     CHECK);
5963 
5964   // Size of Java itable (in words)
5965   _itable_size = _access_flags.is_interface() ? 0 :
5966     klassItable::compute_itable_size(_transitive_interfaces);
5967 
5968   assert(_fac != NULL, "invariant");
5969   assert(_parsed_annotations != NULL, "invariant");
5970 
5971   _field_info = new FieldLayoutInfo();
5972   layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
5973 
5974   // Compute reference typ
5975   _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
5976 
5977 }
5978 
5979 void ClassFileParser::set_klass(InstanceKlass* klass) {
5980 
5981 #ifdef ASSERT
5982   if (klass != NULL) {
5983     assert(NULL == _klass, "leaking?");
5984   }
5985 #endif
5986 
5987   _klass = klass;
5988 }
5989 
5990 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5991 
5992 #ifdef ASSERT
5993   if (klass != NULL) {
5994     assert(NULL == _klass_to_deallocate, "leaking?");
5995   }
5996 #endif
5997 
5998   _klass_to_deallocate = klass;
5999 }
6000 
6001 // Caller responsible for ResourceMark
6002 // clone stream with rewound position
6003 const ClassFileStream* ClassFileParser::clone_stream() const {
6004   assert(_stream != NULL, "invariant");
6005 
6006   return _stream->clone();
6007 }
6008 // ----------------------------------------------------------------------------
6009 // debugging
6010 
6011 #ifdef ASSERT
6012 
6013 // return true if class_name contains no '.' (internal format is '/')
6014 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6015   if (class_name != NULL) {
6016     ResourceMark rm;
6017     char* name = class_name->as_C_string();
6018     return strchr(name, '.') == NULL;
6019   } else {
6020     return true;
6021   }
6022 }
6023 
6024 #endif