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/symbolTable.hpp"
  32 #include "classfile/systemDictionary.hpp"
  33 #include "classfile/verificationType.hpp"
  34 #include "classfile/verifier.hpp"
  35 #include "classfile/vmSymbols.hpp"
  36 #include "gc/shared/gcLocker.hpp"
  37 #include "memory/allocation.hpp"
  38 #include "memory/metadataFactory.hpp"
  39 #include "memory/oopFactory.hpp"
  40 #include "memory/resourceArea.hpp"
  41 #include "memory/universe.inline.hpp"
  42 #include "oops/annotations.hpp"
  43 #include "oops/fieldStreams.hpp"
  44 #include "oops/instanceKlass.hpp"
  45 #include "oops/instanceMirrorKlass.hpp"
  46 #include "oops/klass.inline.hpp"
  47 #include "oops/klassVtable.hpp"
  48 #include "oops/metadata.hpp"
  49 #include "oops/method.hpp"
  50 #include "oops/oop.inline.hpp"
  51 #include "oops/symbol.hpp"
  52 #include "prims/jvm.h"
  53 #include "prims/jvmtiExport.hpp"
  54 #include "prims/jvmtiThreadState.hpp"
  55 #include "runtime/javaCalls.hpp"
  56 #include "runtime/perfData.hpp"
  57 #include "runtime/reflection.hpp"
  58 #include "runtime/signature.hpp"
  59 #include "runtime/timer.hpp"
  60 #include "services/classLoadingService.hpp"
  61 #include "services/threadService.hpp"
  62 #include "trace/traceMacros.hpp"
  63 #include "utilities/array.hpp"
  64 #include "utilities/exceptions.hpp"
  65 #include "utilities/globalDefinitions.hpp"
  66 #include "utilities/macros.hpp"
  67 #include "utilities/ostream.hpp"
  68 #include "utilities/resourceHash.hpp"
  69 #if INCLUDE_CDS
  70 #include "classfile/systemDictionaryShared.hpp"
  71 #endif
  72 
  73 // We generally try to create the oops directly when parsing, rather than
  74 // allocating temporary data structures and copying the bytes twice. A
  75 // temporary area is only needed when parsing utf8 entries in the constant
  76 // pool and when parsing line number tables.
  77 
  78 // We add assert in debug mode when class format is not checked.
  79 
  80 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
  81 #define JAVA_MIN_SUPPORTED_VERSION        45
  82 #define JAVA_MAX_SUPPORTED_VERSION        52
  83 #define JAVA_MAX_SUPPORTED_MINOR_VERSION  0
  84 
  85 // Used for two backward compatibility reasons:
  86 // - to check for new additions to the class file format in JDK1.5
  87 // - to check for bug fixes in the format checker in JDK1.5
  88 #define JAVA_1_5_VERSION                  49
  89 
  90 // Used for backward compatibility reasons:
  91 // - to check for javac bug fixes that happened after 1.5
  92 // - also used as the max version when running in jdk6
  93 #define JAVA_6_VERSION                    50
  94 
  95 // Used for backward compatibility reasons:
  96 // - to check NameAndType_info signatures more aggressively
  97 // - to disallow argument and require ACC_STATIC for <clinit> methods
  98 #define JAVA_7_VERSION                    51
  99 
 100 // Extension method support.
 101 #define JAVA_8_VERSION                    52
 102 
 103 enum { LegalClass, LegalField, LegalMethod }; // used to verify unqualified names
 104 
 105 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 106                                                   ConstantPool* cp,
 107                                                   const int length,
 108                                                   TRAPS) {
 109   assert(stream != NULL, "invariant");
 110   assert(cp != NULL, "invariant");
 111 
 112   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 113   // this function (_current can be allocated in a register, with scalar
 114   // replacement of aggregates). The _current pointer is copied back to
 115   // stream() when this function returns. DON'T call another method within
 116   // this method that uses stream().
 117   const ClassFileStream cfs1 = *stream;
 118   const ClassFileStream* const cfs = &cfs1;
 119 
 120   assert(cfs->allocated_on_stack(), "should be local");
 121   debug_only(const u1* const old_current = stream->current();)
 122 
 123   // Used for batching symbol allocations.
 124   const char* names[SymbolTable::symbol_alloc_batch_size];
 125   int lengths[SymbolTable::symbol_alloc_batch_size];
 126   int indices[SymbolTable::symbol_alloc_batch_size];
 127   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 128   int names_count = 0;
 129 
 130   // parsing  Index 0 is unused
 131   for (int index = 1; index < length; index++) {
 132     // Each of the following case guarantees one more byte in the stream
 133     // for the following tag or the access_flags following constant pool,
 134     // so we don't need bounds-check for reading tag.
 135     const u1 tag = cfs->get_u1_fast();
 136     switch (tag) {
 137       case JVM_CONSTANT_Class : {
 138         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 139         const u2 name_index = cfs->get_u2_fast();
 140         cp->klass_index_at_put(index, name_index);
 141         break;
 142       }
 143       case JVM_CONSTANT_Fieldref: {
 144         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 145         const u2 class_index = cfs->get_u2_fast();
 146         const u2 name_and_type_index = cfs->get_u2_fast();
 147         cp->field_at_put(index, class_index, name_and_type_index);
 148         break;
 149       }
 150       case JVM_CONSTANT_Methodref: {
 151         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 152         const u2 class_index = cfs->get_u2_fast();
 153         const u2 name_and_type_index = cfs->get_u2_fast();
 154         cp->method_at_put(index, class_index, name_and_type_index);
 155         break;
 156       }
 157       case JVM_CONSTANT_InterfaceMethodref: {
 158         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 159         const u2 class_index = cfs->get_u2_fast();
 160         const u2 name_and_type_index = cfs->get_u2_fast();
 161         cp->interface_method_at_put(index, class_index, name_and_type_index);
 162         break;
 163       }
 164       case JVM_CONSTANT_String : {
 165         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 166         const u2 string_index = cfs->get_u2_fast();
 167         cp->string_index_at_put(index, string_index);
 168         break;
 169       }
 170       case JVM_CONSTANT_MethodHandle :
 171       case JVM_CONSTANT_MethodType: {
 172         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 173           classfile_parse_error(
 174             "Class file version does not support constant tag %u in class file %s",
 175             tag, CHECK);
 176         }
 177         if (tag == JVM_CONSTANT_MethodHandle) {
 178           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 179           const u1 ref_kind = cfs->get_u1_fast();
 180           const u2 method_index = cfs->get_u2_fast();
 181           cp->method_handle_index_at_put(index, ref_kind, method_index);
 182         }
 183         else if (tag == JVM_CONSTANT_MethodType) {
 184           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 185           const u2 signature_index = cfs->get_u2_fast();
 186           cp->method_type_index_at_put(index, signature_index);
 187         }
 188         else {
 189           ShouldNotReachHere();
 190         }
 191         break;
 192       }
 193       case JVM_CONSTANT_InvokeDynamic : {
 194         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 195           classfile_parse_error(
 196               "Class file version does not support constant tag %u in class file %s",
 197               tag, CHECK);
 198         }
 199         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 200         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 201         const u2 name_and_type_index = cfs->get_u2_fast();
 202         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 203           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 204         }
 205         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 206         break;
 207       }
 208       case JVM_CONSTANT_Integer: {
 209         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 210         const u4 bytes = cfs->get_u4_fast();
 211         cp->int_at_put(index, (jint)bytes);
 212         break;
 213       }
 214       case JVM_CONSTANT_Float: {
 215         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 216         const u4 bytes = cfs->get_u4_fast();
 217         cp->float_at_put(index, *(jfloat*)&bytes);
 218         break;
 219       }
 220       case JVM_CONSTANT_Long: {
 221         // A mangled type might cause you to overrun allocated memory
 222         guarantee_property(index + 1 < length,
 223                            "Invalid constant pool entry %u in class file %s",
 224                            index,
 225                            CHECK);
 226         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 227         const u8 bytes = cfs->get_u8_fast();
 228         cp->long_at_put(index, bytes);
 229         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 230         break;
 231       }
 232       case JVM_CONSTANT_Double: {
 233         // A mangled type might cause you to overrun allocated memory
 234         guarantee_property(index+1 < length,
 235                            "Invalid constant pool entry %u in class file %s",
 236                            index,
 237                            CHECK);
 238         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 239         const u8 bytes = cfs->get_u8_fast();
 240         cp->double_at_put(index, *(jdouble*)&bytes);
 241         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 242         break;
 243       }
 244       case JVM_CONSTANT_NameAndType: {
 245         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 246         const u2 name_index = cfs->get_u2_fast();
 247         const u2 signature_index = cfs->get_u2_fast();
 248         cp->name_and_type_at_put(index, name_index, signature_index);
 249         break;
 250       }
 251       case JVM_CONSTANT_Utf8 : {
 252         cfs->guarantee_more(2, CHECK);  // utf8_length
 253         u2  utf8_length = cfs->get_u2_fast();
 254         const u1* utf8_buffer = cfs->get_u1_buffer();
 255         assert(utf8_buffer != NULL, "null utf8 buffer");
 256         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 257         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 258         cfs->skip_u1_fast(utf8_length);
 259 
 260         // Before storing the symbol, make sure it's legal
 261         if (_need_verify) {
 262           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 263         }
 264 
 265         if (has_cp_patch_at(index)) {
 266           Handle patch = clear_cp_patch_at(index);
 267           guarantee_property(java_lang_String::is_instance(patch()),
 268                              "Illegal utf8 patch at %d in class file %s",
 269                              index,
 270                              CHECK);
 271           const char* const str = java_lang_String::as_utf8_string(patch());
 272           // (could use java_lang_String::as_symbol instead, but might as well batch them)
 273           utf8_buffer = (const u1*) str;
 274           utf8_length = (int) strlen(str);
 275         }
 276 
 277         unsigned int hash;
 278         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 279                                                         utf8_length,
 280                                                         hash);
 281         if (result == NULL) {
 282           names[names_count] = (const char*)utf8_buffer;
 283           lengths[names_count] = utf8_length;
 284           indices[names_count] = index;
 285           hashValues[names_count++] = hash;
 286           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 287             SymbolTable::new_symbols(_loader_data,
 288                                      cp,
 289                                      names_count,
 290                                      names,
 291                                      lengths,
 292                                      indices,
 293                                      hashValues,
 294                                      CHECK);
 295             names_count = 0;
 296           }
 297         } else {
 298           cp->symbol_at_put(index, result);
 299         }
 300         break;
 301       }
 302       default: {
 303         classfile_parse_error("Unknown constant tag %u in class file %s",
 304                               tag,
 305                               CHECK);
 306         break;
 307       }
 308     } // end of switch(tag)
 309   } // end of for
 310 
 311   // Allocate the remaining symbols
 312   if (names_count > 0) {
 313     SymbolTable::new_symbols(_loader_data,
 314                              cp,
 315                              names_count,
 316                              names,
 317                              lengths,
 318                              indices,
 319                              hashValues,
 320                              CHECK);
 321   }
 322 
 323   // Copy _current pointer of local copy back to stream.
 324   assert(stream->current() == old_current, "non-exclusive use of stream");
 325   stream->set_current(cfs1.current());
 326 
 327 }
 328 
 329 static inline bool valid_cp_range(int index, int length) {
 330   return (index > 0 && index < length);
 331 }
 332 
 333 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 334   assert(cp != NULL, "invariant");
 335   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 336     return cp->symbol_at(index);
 337   }
 338   return NULL;
 339 }
 340 
 341 #ifdef ASSERT
 342 PRAGMA_DIAG_PUSH
 343 PRAGMA_FORMAT_NONLITERAL_IGNORED
 344 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
 345   ResourceMark rm(THREAD);
 346   fatal(msg, _class_name->as_C_string());
 347 }
 348 
 349 void ClassFileParser::report_assert_property_failure(const char* msg,
 350                                                      int index,
 351                                                      TRAPS) const {
 352   ResourceMark rm(THREAD);
 353   fatal(msg, index, _class_name->as_C_string());
 354 }
 355 PRAGMA_DIAG_POP
 356 #endif
 357 
 358 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 359                                           ConstantPool* const cp,
 360                                           const int length,
 361                                           TRAPS) {
 362   assert(cp != NULL, "invariant");
 363   assert(stream != NULL, "invariant");
 364 
 365   // parsing constant pool entries
 366   parse_constant_pool_entries(stream, cp, length, CHECK);
 367 
 368   int index = 1;  // declared outside of loops for portability
 369 
 370   // first verification pass - validate cross references
 371   // and fixup class and string constants
 372   for (index = 1; index < length; index++) {          // Index 0 is unused
 373     const jbyte tag = cp->tag_at(index).value();
 374     switch (tag) {
 375       case JVM_CONSTANT_Class: {
 376         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 377         break;
 378       }
 379       case JVM_CONSTANT_Fieldref:
 380         // fall through
 381       case JVM_CONSTANT_Methodref:
 382         // fall through
 383       case JVM_CONSTANT_InterfaceMethodref: {
 384         if (!_need_verify) break;
 385         const int klass_ref_index = cp->klass_ref_index_at(index);
 386         const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index);
 387         check_property(valid_klass_reference_at(klass_ref_index),
 388                        "Invalid constant pool index %u in class file %s",
 389                        klass_ref_index, CHECK);
 390         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 391           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 392           "Invalid constant pool index %u in class file %s",
 393           name_and_type_ref_index, CHECK);
 394         break;
 395       }
 396       case JVM_CONSTANT_String: {
 397         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 398         break;
 399       }
 400       case JVM_CONSTANT_Integer:
 401         break;
 402       case JVM_CONSTANT_Float:
 403         break;
 404       case JVM_CONSTANT_Long:
 405       case JVM_CONSTANT_Double: {
 406         index++;
 407         check_property(
 408           (index < length && cp->tag_at(index).is_invalid()),
 409           "Improper constant pool long/double index %u in class file %s",
 410           index, CHECK);
 411         break;
 412       }
 413       case JVM_CONSTANT_NameAndType: {
 414         if (!_need_verify) break;
 415         const int name_ref_index = cp->name_ref_index_at(index);
 416         const int signature_ref_index = cp->signature_ref_index_at(index);
 417         check_property(valid_symbol_at(name_ref_index),
 418           "Invalid constant pool index %u in class file %s",
 419           name_ref_index, CHECK);
 420         check_property(valid_symbol_at(signature_ref_index),
 421           "Invalid constant pool index %u in class file %s",
 422           signature_ref_index, CHECK);
 423         break;
 424       }
 425       case JVM_CONSTANT_Utf8:
 426         break;
 427       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 428       case JVM_CONSTANT_UnresolvedClassInError: {
 429         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 430         break;
 431       }
 432       case JVM_CONSTANT_ClassIndex: {
 433         const int class_index = cp->klass_index_at(index);
 434         check_property(valid_symbol_at(class_index),
 435           "Invalid constant pool index %u in class file %s",
 436           class_index, CHECK);
 437         cp->unresolved_klass_at_put(index, cp->symbol_at(class_index));
 438         break;
 439       }
 440       case JVM_CONSTANT_StringIndex: {
 441         const int string_index = cp->string_index_at(index);
 442         check_property(valid_symbol_at(string_index),
 443           "Invalid constant pool index %u in class file %s",
 444           string_index, CHECK);
 445         Symbol* const sym = cp->symbol_at(string_index);
 446         cp->unresolved_string_at_put(index, sym);
 447         break;
 448       }
 449       case JVM_CONSTANT_MethodHandle: {
 450         const int ref_index = cp->method_handle_index_at(index);
 451         check_property(valid_cp_range(ref_index, length),
 452           "Invalid constant pool index %u in class file %s",
 453           ref_index, CHECK);
 454         const constantTag tag = cp->tag_at(ref_index);
 455         const int ref_kind = cp->method_handle_ref_kind_at(index);
 456 
 457         switch (ref_kind) {
 458           case JVM_REF_getField:
 459           case JVM_REF_getStatic:
 460           case JVM_REF_putField:
 461           case JVM_REF_putStatic: {
 462             check_property(
 463               tag.is_field(),
 464               "Invalid constant pool index %u in class file %s (not a field)",
 465               ref_index, CHECK);
 466             break;
 467           }
 468           case JVM_REF_invokeVirtual:
 469           case JVM_REF_newInvokeSpecial: {
 470             check_property(
 471               tag.is_method(),
 472               "Invalid constant pool index %u in class file %s (not a method)",
 473               ref_index, CHECK);
 474             break;
 475           }
 476           case JVM_REF_invokeStatic:
 477           case JVM_REF_invokeSpecial: {
 478             check_property(
 479               tag.is_method() ||
 480               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 481               "Invalid constant pool index %u in class file %s (not a method)",
 482               ref_index, CHECK);
 483             break;
 484           }
 485           case JVM_REF_invokeInterface: {
 486             check_property(
 487               tag.is_interface_method(),
 488               "Invalid constant pool index %u in class file %s (not an interface method)",
 489               ref_index, CHECK);
 490             break;
 491           }
 492           default: {
 493             classfile_parse_error(
 494               "Bad method handle kind at constant pool index %u in class file %s",
 495               index, CHECK);
 496           }
 497         } // switch(refkind)
 498         // Keep the ref_index unchanged.  It will be indirected at link-time.
 499         break;
 500       } // case MethodHandle
 501       case JVM_CONSTANT_MethodType: {
 502         const int ref_index = cp->method_type_index_at(index);
 503         check_property(valid_symbol_at(ref_index),
 504           "Invalid constant pool index %u in class file %s",
 505           ref_index, CHECK);
 506         break;
 507       }
 508       case JVM_CONSTANT_InvokeDynamic: {
 509         const int name_and_type_ref_index =
 510           cp->invoke_dynamic_name_and_type_ref_index_at(index);
 511 
 512         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 513           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 514           "Invalid constant pool index %u in class file %s",
 515           name_and_type_ref_index, CHECK);
 516         // bootstrap specifier index must be checked later,
 517         // when BootstrapMethods attr is available
 518         break;
 519       }
 520       default: {
 521         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 522         ShouldNotReachHere();
 523         break;
 524       }
 525     } // switch(tag)
 526   } // end of for
 527 
 528   if (_cp_patches != NULL) {
 529     // need to treat this_class specially...
 530     int this_class_index;
 531     {
 532       stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
 533       const u1* const mark = stream->current();
 534       stream->skip_u2_fast(1); // skip flags
 535       this_class_index = stream->get_u2_fast();
 536       stream->set_current(mark);  // revert to mark
 537     }
 538 
 539     for (index = 1; index < length; index++) {          // Index 0 is unused
 540       if (has_cp_patch_at(index)) {
 541         guarantee_property(index != this_class_index,
 542           "Illegal constant pool patch to self at %d in class file %s",
 543           index, CHECK);
 544         patch_constant_pool(cp, index, cp_patch_at(index), CHECK);
 545       }
 546     }
 547   }
 548 
 549   if (!_need_verify) {
 550     return;
 551   }
 552 
 553   // second verification pass - checks the strings are of the right format.
 554   // but not yet to the other entries
 555   for (index = 1; index < length; index++) {
 556     const jbyte tag = cp->tag_at(index).value();
 557     switch (tag) {
 558       case JVM_CONSTANT_UnresolvedClass: {
 559         const Symbol* const class_name = cp->klass_name_at(index);
 560         // check the name, even if _cp_patches will overwrite it
 561         verify_legal_class_name(class_name, CHECK);
 562         break;
 563       }
 564       case JVM_CONSTANT_NameAndType: {
 565         if (_need_verify && _major_version >= JAVA_7_VERSION) {
 566           const int sig_index = cp->signature_ref_index_at(index);
 567           const int name_index = cp->name_ref_index_at(index);
 568           const Symbol* const name = cp->symbol_at(name_index);
 569           const Symbol* const sig = cp->symbol_at(sig_index);
 570           guarantee_property(sig->utf8_length() != 0,
 571             "Illegal zero length constant pool entry at %d in class %s",
 572             sig_index, CHECK);
 573           if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) {
 574             verify_legal_method_signature(name, sig, CHECK);
 575           } else {
 576             verify_legal_field_signature(name, sig, CHECK);
 577           }
 578         }
 579         break;
 580       }
 581       case JVM_CONSTANT_InvokeDynamic:
 582       case JVM_CONSTANT_Fieldref:
 583       case JVM_CONSTANT_Methodref:
 584       case JVM_CONSTANT_InterfaceMethodref: {
 585         const int name_and_type_ref_index =
 586           cp->name_and_type_ref_index_at(index);
 587         // already verified to be utf8
 588         const int name_ref_index =
 589           cp->name_ref_index_at(name_and_type_ref_index);
 590         // already verified to be utf8
 591         const int signature_ref_index =
 592           cp->signature_ref_index_at(name_and_type_ref_index);
 593         const Symbol* const name = cp->symbol_at(name_ref_index);
 594         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 595         if (tag == JVM_CONSTANT_Fieldref) {
 596           verify_legal_field_name(name, CHECK);
 597           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 598             // Signature is verified above, when iterating NameAndType_info.
 599             // Need only to be sure it's non-zero length and the right type.
 600             if (signature->utf8_length() == 0 ||
 601                 signature->byte_at(0) == JVM_SIGNATURE_FUNC) {
 602               throwIllegalSignature(
 603                 "Field", name, signature, CHECK);
 604             }
 605           } else {
 606             verify_legal_field_signature(name, signature, CHECK);
 607           }
 608         } else {
 609           verify_legal_method_name(name, CHECK);
 610           if (_need_verify && _major_version >= JAVA_7_VERSION) {
 611             // Signature is verified above, when iterating NameAndType_info.
 612             // Need only to be sure it's non-zero length and the right type.
 613             if (signature->utf8_length() == 0 ||
 614                 signature->byte_at(0) != JVM_SIGNATURE_FUNC) {
 615               throwIllegalSignature(
 616                 "Method", name, signature, CHECK);
 617             }
 618           } else {
 619             verify_legal_method_signature(name, signature, CHECK);
 620           }
 621           if (tag == JVM_CONSTANT_Methodref) {
 622             // 4509014: If a class method name begins with '<', it must be "<init>".
 623             assert(name != NULL, "method name in constant pool is null");
 624             const unsigned int name_len = name->utf8_length();
 625             if (name_len != 0 && name->byte_at(0) == '<') {
 626               if (name != vmSymbols::object_initializer_name()) {
 627                 classfile_parse_error(
 628                   "Bad method name at constant pool index %u in class file %s",
 629                   name_ref_index, CHECK);
 630               }
 631             }
 632           }
 633         }
 634         break;
 635       }
 636       case JVM_CONSTANT_MethodHandle: {
 637         const int ref_index = cp->method_handle_index_at(index);
 638         const int ref_kind = cp->method_handle_ref_kind_at(index);
 639         switch (ref_kind) {
 640           case JVM_REF_invokeVirtual:
 641           case JVM_REF_invokeStatic:
 642           case JVM_REF_invokeSpecial:
 643           case JVM_REF_newInvokeSpecial: {
 644             const int name_and_type_ref_index =
 645               cp->name_and_type_ref_index_at(ref_index);
 646             const int name_ref_index =
 647               cp->name_ref_index_at(name_and_type_ref_index);
 648             const Symbol* const name = cp->symbol_at(name_ref_index);
 649             if (ref_kind == JVM_REF_newInvokeSpecial) {
 650               if (name != vmSymbols::object_initializer_name()) {
 651                 classfile_parse_error(
 652                   "Bad constructor name at constant pool index %u in class file %s",
 653                     name_ref_index, CHECK);
 654               }
 655             } else {
 656               if (name == vmSymbols::object_initializer_name()) {
 657                 classfile_parse_error(
 658                   "Bad method name at constant pool index %u in class file %s",
 659                   name_ref_index, CHECK);
 660               }
 661             }
 662             break;
 663           }
 664           // Other ref_kinds are already fully checked in previous pass.
 665         } // switch(ref_kind)
 666         break;
 667       }
 668       case JVM_CONSTANT_MethodType: {
 669         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 670         const Symbol* const signature = cp->method_type_signature_at(index);
 671         verify_legal_method_signature(no_name, signature, CHECK);
 672         break;
 673       }
 674       case JVM_CONSTANT_Utf8: {
 675         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 676       }
 677     }  // switch(tag)
 678   }  // end of for
 679 }
 680 
 681 void ClassFileParser::patch_constant_pool(ConstantPool* cp,
 682                                           int index,
 683                                           Handle patch,
 684                                           TRAPS) {
 685   assert(cp != NULL, "invariant");
 686 
 687   BasicType patch_type = T_VOID;
 688 
 689   switch (cp->tag_at(index).value()) {
 690 
 691     case JVM_CONSTANT_UnresolvedClass: {
 692       // Patching a class means pre-resolving it.
 693       // The name in the constant pool is ignored.
 694       if (java_lang_Class::is_instance(patch())) {
 695         guarantee_property(!java_lang_Class::is_primitive(patch()),
 696                            "Illegal class patch at %d in class file %s",
 697                            index, CHECK);
 698         cp->klass_at_put(index, java_lang_Class::as_Klass(patch()));
 699       } else {
 700         guarantee_property(java_lang_String::is_instance(patch()),
 701                            "Illegal class patch at %d in class file %s",
 702                            index, CHECK);
 703         Symbol* const name = java_lang_String::as_symbol(patch(), CHECK);
 704         cp->unresolved_klass_at_put(index, name);
 705       }
 706       break;
 707     }
 708 
 709     case JVM_CONSTANT_String: {
 710       // skip this patch and don't clear it.  Needs the oop array for resolved
 711       // references to be created first.
 712       return;
 713     }
 714     case JVM_CONSTANT_Integer: patch_type = T_INT;    goto patch_prim;
 715     case JVM_CONSTANT_Float:   patch_type = T_FLOAT;  goto patch_prim;
 716     case JVM_CONSTANT_Long:    patch_type = T_LONG;   goto patch_prim;
 717     case JVM_CONSTANT_Double:  patch_type = T_DOUBLE; goto patch_prim;
 718     patch_prim:
 719     {
 720       jvalue value;
 721       BasicType value_type = java_lang_boxing_object::get_value(patch(), &value);
 722       guarantee_property(value_type == patch_type,
 723                          "Illegal primitive patch at %d in class file %s",
 724                          index, CHECK);
 725       switch (value_type) {
 726         case T_INT:    cp->int_at_put(index,   value.i); break;
 727         case T_FLOAT:  cp->float_at_put(index, value.f); break;
 728         case T_LONG:   cp->long_at_put(index,  value.j); break;
 729         case T_DOUBLE: cp->double_at_put(index, value.d); break;
 730         default:       assert(false, "");
 731       }
 732     } // end patch_prim label
 733     break;
 734 
 735     default: {
 736       // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc.
 737       guarantee_property(!has_cp_patch_at(index),
 738                          "Illegal unexpected patch at %d in class file %s",
 739                          index, CHECK);
 740       return;
 741     }
 742   } // end of switch(tag)
 743 
 744   // On fall-through, mark the patch as used.
 745   clear_cp_patch_at(index);
 746 }
 747 class NameSigHash: public ResourceObj {
 748  public:
 749   const Symbol*       _name;       // name
 750   const Symbol*       _sig;        // signature
 751   NameSigHash*  _next;             // Next entry in hash table
 752 };
 753 
 754 static const int HASH_ROW_SIZE = 256;
 755 
 756 static unsigned int hash(const Symbol* name, const Symbol* sig) {
 757   unsigned int raw_hash = 0;
 758   raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2);
 759   raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize;
 760 
 761   return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE;
 762 }
 763 
 764 
 765 static void initialize_hashtable(NameSigHash** table) {
 766   memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE);
 767 }
 768 // Return false if the name/sig combination is found in table.
 769 // Return true if no duplicate is found. And name/sig is added as a new entry in table.
 770 // The old format checker uses heap sort to find duplicates.
 771 // NOTE: caller should guarantee that GC doesn't happen during the life cycle
 772 // of table since we don't expect Symbol*'s to move.
 773 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) {
 774   assert(name != NULL, "name in constant pool is NULL");
 775 
 776   // First lookup for duplicates
 777   int index = hash(name, sig);
 778   NameSigHash* entry = table[index];
 779   while (entry != NULL) {
 780     if (entry->_name == name && entry->_sig == sig) {
 781       return false;
 782     }
 783     entry = entry->_next;
 784   }
 785 
 786   // No duplicate is found, allocate a new entry and fill it.
 787   entry = new NameSigHash();
 788   entry->_name = name;
 789   entry->_sig = sig;
 790 
 791   // Insert into hash table
 792   entry->_next = table[index];
 793   table[index] = entry;
 794 
 795   return true;
 796 }
 797 
 798 // Side-effects: populates the _local_interfaces field
 799 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
 800                                        const int itfs_len,
 801                                        ConstantPool* const cp,
 802                                        bool* const has_default_methods,
 803                                        TRAPS) {
 804   assert(stream != NULL, "invariant");
 805   assert(cp != NULL, "invariant");
 806   assert(has_default_methods != NULL, "invariant");
 807 
 808   if (itfs_len == 0) {
 809     _local_interfaces = Universe::the_empty_klass_array();
 810   } else {
 811     assert(itfs_len > 0, "only called for len>0");
 812     _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK);
 813 
 814     int index;
 815     for (index = 0; index < itfs_len; index++) {
 816       const u2 interface_index = stream->get_u2(CHECK);
 817       KlassHandle interf;
 818       check_property(
 819         valid_klass_reference_at(interface_index),
 820         "Interface name has bad constant pool index %u in class file %s",
 821         interface_index, CHECK);
 822       if (cp->tag_at(interface_index).is_klass()) {
 823         interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index));
 824       } else {
 825         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
 826 
 827         // Don't need to check legal name because it's checked when parsing constant pool.
 828         // But need to make sure it's not an array type.
 829         guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY,
 830                            "Bad interface name in class file %s", CHECK);
 831 
 832         // Call resolve_super so classcircularity is checked
 833         const Klass* const k =
 834           SystemDictionary::resolve_super_or_fail(_class_name,
 835                                                   unresolved_klass,
 836                                                   _loader_data->class_loader(),
 837                                                   _protection_domain,
 838                                                   false,
 839                                                   CHECK);
 840         interf = KlassHandle(THREAD, k);
 841       }
 842 
 843       if (!interf()->is_interface()) {
 844         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 845                    "Implementing class");
 846       }
 847 
 848       if (InstanceKlass::cast(interf())->has_default_methods()) {
 849         *has_default_methods = true;
 850       }
 851       _local_interfaces->at_put(index, interf());
 852     }
 853 
 854     if (!_need_verify || itfs_len <= 1) {
 855       return;
 856     }
 857 
 858     // Check if there's any duplicates in interfaces
 859     ResourceMark rm(THREAD);
 860     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
 861                                                                  NameSigHash*,
 862                                                                  HASH_ROW_SIZE);
 863     initialize_hashtable(interface_names);
 864     bool dup = false;
 865     {
 866       debug_only(NoSafepointVerifier nsv;)
 867       for (index = 0; index < itfs_len; index++) {
 868         const Klass* const k = _local_interfaces->at(index);
 869         const Symbol* const name = InstanceKlass::cast(k)->name();
 870         // If no duplicates, add (name, NULL) in hashtable interface_names.
 871         if (!put_after_lookup(name, NULL, interface_names)) {
 872           dup = true;
 873           break;
 874         }
 875       }
 876     }
 877     if (dup) {
 878       classfile_parse_error("Duplicate interface name in class file %s", CHECK);
 879     }
 880   }
 881 }
 882 
 883 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 884                                            int constantvalue_index,
 885                                            int signature_index,
 886                                            TRAPS) const {
 887   // Make sure the constant pool entry is of a type appropriate to this field
 888   guarantee_property(
 889     (constantvalue_index > 0 &&
 890       constantvalue_index < cp->length()),
 891     "Bad initial value index %u in ConstantValue attribute in class file %s",
 892     constantvalue_index, CHECK);
 893 
 894   const constantTag value_type = cp->tag_at(constantvalue_index);
 895   switch(cp->basic_type_for_signature_at(signature_index)) {
 896     case T_LONG: {
 897       guarantee_property(value_type.is_long(),
 898                          "Inconsistent constant value type in class file %s",
 899                          CHECK);
 900       break;
 901     }
 902     case T_FLOAT: {
 903       guarantee_property(value_type.is_float(),
 904                          "Inconsistent constant value type in class file %s",
 905                          CHECK);
 906       break;
 907     }
 908     case T_DOUBLE: {
 909       guarantee_property(value_type.is_double(),
 910                          "Inconsistent constant value type in class file %s",
 911                          CHECK);
 912       break;
 913     }
 914     case T_BYTE:
 915     case T_CHAR:
 916     case T_SHORT:
 917     case T_BOOLEAN:
 918     case T_INT: {
 919       guarantee_property(value_type.is_int(),
 920                          "Inconsistent constant value type in class file %s",
 921                          CHECK);
 922       break;
 923     }
 924     case T_OBJECT: {
 925       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 926                          && value_type.is_string()),
 927                          "Bad string initial value in class file %s",
 928                          CHECK);
 929       break;
 930     }
 931     default: {
 932       classfile_parse_error("Unable to set initial value %u in class file %s",
 933                              constantvalue_index,
 934                              CHECK);
 935     }
 936   }
 937 }
 938 
 939 class AnnotationCollector : public ResourceObj{
 940 public:
 941   enum Location { _in_field, _in_method, _in_class };
 942   enum ID {
 943     _unknown = 0,
 944     _method_CallerSensitive,
 945     _method_ForceInline,
 946     _method_DontInline,
 947     _method_InjectedProfile,
 948     _method_LambdaForm_Compiled,
 949     _method_LambdaForm_Hidden,
 950     _method_HotSpotIntrinsicCandidate,
 951     _jdk_internal_vm_annotation_Contended,
 952     _field_Stable,
 953     _jdk_internal_vm_annotation_ReservedStackAccess,
 954     _annotation_LIMIT
 955   };
 956   const Location _location;
 957   int _annotations_present;
 958   u2 _contended_group;
 959 
 960   AnnotationCollector(Location location)
 961     : _location(location), _annotations_present(0)
 962   {
 963     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
 964   }
 965   // If this annotation name has an ID, report it (or _none).
 966   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name);
 967   // Set the annotation name:
 968   void set_annotation(ID id) {
 969     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 970     _annotations_present |= nth_bit((int)id);
 971   }
 972 
 973   void remove_annotation(ID id) {
 974     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 975     _annotations_present &= ~nth_bit((int)id);
 976   }
 977 
 978   // Report if the annotation is present.
 979   bool has_any_annotations() const { return _annotations_present != 0; }
 980   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
 981 
 982   void set_contended_group(u2 group) { _contended_group = group; }
 983   u2 contended_group() const { return _contended_group; }
 984 
 985   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
 986 
 987   void set_stable(bool stable) { set_annotation(_field_Stable); }
 988   bool is_stable() const { return has_annotation(_field_Stable); }
 989 };
 990 
 991 // This class also doubles as a holder for metadata cleanup.
 992 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
 993 private:
 994   ClassLoaderData* _loader_data;
 995   AnnotationArray* _field_annotations;
 996   AnnotationArray* _field_type_annotations;
 997 public:
 998   FieldAnnotationCollector(ClassLoaderData* loader_data) :
 999     AnnotationCollector(_in_field),
1000     _loader_data(loader_data),
1001     _field_annotations(NULL),
1002     _field_type_annotations(NULL) {}
1003   ~FieldAnnotationCollector();
1004   void apply_to(FieldInfo* f);
1005   AnnotationArray* field_annotations()      { return _field_annotations; }
1006   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1007 
1008   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
1009   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1010 };
1011 
1012 class MethodAnnotationCollector : public AnnotationCollector{
1013 public:
1014   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1015   void apply_to(methodHandle m);
1016 };
1017 
1018 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1019 public:
1020   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1021   void apply_to(InstanceKlass* ik);
1022 };
1023 
1024 
1025 static int skip_annotation_value(const u1*, int, int); // fwd decl
1026 
1027 // Skip an annotation.  Return >=limit if there is any problem.
1028 static int skip_annotation(const u1* buffer, int limit, int index) {
1029   assert(buffer != NULL, "invariant");
1030   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1031   // value := switch (tag:u1) { ... }
1032   index += 2;  // skip atype
1033   if ((index += 2) >= limit)  return limit;  // read nmem
1034   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1035   while (--nmem >= 0 && index < limit) {
1036     index += 2; // skip member
1037     index = skip_annotation_value(buffer, limit, index);
1038   }
1039   return index;
1040 }
1041 
1042 // Skip an annotation value.  Return >=limit if there is any problem.
1043 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1044   assert(buffer != NULL, "invariant");
1045 
1046   // value := switch (tag:u1) {
1047   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1048   //   case e: e_class:u2 e_name:u2;
1049   //   case s: s_con:u2;
1050   //   case [: do(nval:u2) {value};
1051   //   case @: annotation;
1052   //   case s: s_con:u2;
1053   // }
1054   if ((index += 1) >= limit)  return limit;  // read tag
1055   const u1 tag = buffer[index - 1];
1056   switch (tag) {
1057     case 'B':
1058     case 'C':
1059     case 'I':
1060     case 'S':
1061     case 'Z':
1062     case 'D':
1063     case 'F':
1064     case 'J':
1065     case 'c':
1066     case 's':
1067       index += 2;  // skip con or s_con
1068       break;
1069     case 'e':
1070       index += 4;  // skip e_class, e_name
1071       break;
1072     case '[':
1073     {
1074       if ((index += 2) >= limit)  return limit;  // read nval
1075       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1076       while (--nval >= 0 && index < limit) {
1077         index = skip_annotation_value(buffer, limit, index);
1078       }
1079     }
1080     break;
1081     case '@':
1082       index = skip_annotation(buffer, limit, index);
1083       break;
1084     default:
1085       return limit;  //  bad tag byte
1086   }
1087   return index;
1088 }
1089 
1090 // Sift through annotations, looking for those significant to the VM:
1091 static void parse_annotations(const ConstantPool* const cp,
1092                               const u1* buffer, int limit,
1093                               AnnotationCollector* coll,
1094                               ClassLoaderData* loader_data,
1095                               TRAPS) {
1096 
1097   assert(cp != NULL, "invariant");
1098   assert(buffer != NULL, "invariant");
1099   assert(coll != NULL, "invariant");
1100   assert(loader_data != NULL, "invariant");
1101 
1102   // annotations := do(nann:u2) {annotation}
1103   int index = 0;
1104   if ((index += 2) >= limit)  return;  // read nann
1105   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1106   enum {  // initial annotation layout
1107     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1108     count_off = 2,      // u2   such as 1 (one value)
1109     member_off = 4,     // utf8 such as 'value'
1110     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1111     e_tag_val = 'e',
1112     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1113     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1114     e_size = 11,     // end of 'e' annotation
1115     c_tag_val = 'c',    // payload is type
1116     c_con_off = 7,    // utf8 payload, such as 'I'
1117     c_size = 9,       // end of 'c' annotation
1118     s_tag_val = 's',    // payload is String
1119     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1120     s_size = 9,
1121     min_size = 6        // smallest possible size (zero members)
1122   };
1123   while ((--nann) >= 0 && (index - 2 + min_size <= limit)) {
1124     int index0 = index;
1125     index = skip_annotation(buffer, limit, index);
1126     const u1* const abase = buffer + index0;
1127     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1128     const int count = Bytes::get_Java_u2((address)abase + count_off);
1129     const Symbol* const aname = check_symbol_at(cp, atype);
1130     if (aname == NULL)  break;  // invalid annotation name
1131     const Symbol* member = NULL;
1132     if (count >= 1) {
1133       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1134       member = check_symbol_at(cp, member_index);
1135       if (member == NULL)  break;  // invalid member name
1136     }
1137 
1138     // Here is where parsing particular annotations will take place.
1139     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname);
1140     if (AnnotationCollector::_unknown == id)  continue;
1141     coll->set_annotation(id);
1142 
1143     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1144       // @Contended can optionally specify the contention group.
1145       //
1146       // Contended group defines the equivalence class over the fields:
1147       // the fields within the same contended group are not treated distinct.
1148       // The only exception is default group, which does not incur the
1149       // equivalence. Naturally, contention group for classes is meaningless.
1150       //
1151       // While the contention group is specified as String, annotation
1152       // values are already interned, and we might as well use the constant
1153       // pool index as the group tag.
1154       //
1155       u2 group_index = 0; // default contended group
1156       if (count == 1
1157         && s_size == (index - index0)  // match size
1158         && s_tag_val == *(abase + tag_off)
1159         && member == vmSymbols::value_name()) {
1160         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1161         if (cp->symbol_at(group_index)->utf8_length() == 0) {
1162           group_index = 0; // default contended group
1163         }
1164       }
1165       coll->set_contended_group(group_index);
1166     }
1167   }
1168 }
1169 
1170 
1171 // Parse attributes for a field.
1172 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1173                                              u2 attributes_count,
1174                                              bool is_static, u2 signature_index,
1175                                              u2* const constantvalue_index_addr,
1176                                              bool* const is_synthetic_addr,
1177                                              u2* const generic_signature_index_addr,
1178                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1179                                              TRAPS) {
1180   assert(cfs != NULL, "invariant");
1181   assert(constantvalue_index_addr != NULL, "invariant");
1182   assert(is_synthetic_addr != NULL, "invariant");
1183   assert(generic_signature_index_addr != NULL, "invariant");
1184   assert(parsed_annotations != NULL, "invariant");
1185   assert(attributes_count > 0, "attributes_count should be greater than 0");
1186 
1187   u2 constantvalue_index = 0;
1188   u2 generic_signature_index = 0;
1189   bool is_synthetic = false;
1190   const u1* runtime_visible_annotations = NULL;
1191   int runtime_visible_annotations_length = 0;
1192   const u1* runtime_invisible_annotations = NULL;
1193   int runtime_invisible_annotations_length = 0;
1194   const u1* runtime_visible_type_annotations = NULL;
1195   int runtime_visible_type_annotations_length = 0;
1196   const u1* runtime_invisible_type_annotations = NULL;
1197   int runtime_invisible_type_annotations_length = 0;
1198   bool runtime_invisible_annotations_exists = false;
1199   bool runtime_invisible_type_annotations_exists = false;
1200   const ConstantPool* const cp = _cp;
1201 
1202   while (attributes_count--) {
1203     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1204     const u2 attribute_name_index = cfs->get_u2_fast();
1205     const u4 attribute_length = cfs->get_u4_fast();
1206     check_property(valid_symbol_at(attribute_name_index),
1207                    "Invalid field attribute index %u in class file %s",
1208                    attribute_name_index,
1209                    CHECK);
1210 
1211     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1212     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1213       // ignore if non-static
1214       if (constantvalue_index != 0) {
1215         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK);
1216       }
1217       check_property(
1218         attribute_length == 2,
1219         "Invalid ConstantValue field attribute length %u in class file %s",
1220         attribute_length, CHECK);
1221 
1222       constantvalue_index = cfs->get_u2(CHECK);
1223       if (_need_verify) {
1224         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1225       }
1226     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1227       if (attribute_length != 0) {
1228         classfile_parse_error(
1229           "Invalid Synthetic field attribute length %u in class file %s",
1230           attribute_length, CHECK);
1231       }
1232       is_synthetic = true;
1233     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1234       if (attribute_length != 0) {
1235         classfile_parse_error(
1236           "Invalid Deprecated field attribute length %u in class file %s",
1237           attribute_length, CHECK);
1238       }
1239     } else if (_major_version >= JAVA_1_5_VERSION) {
1240       if (attribute_name == vmSymbols::tag_signature()) {
1241         if (attribute_length != 2) {
1242           classfile_parse_error(
1243             "Wrong size %u for field's Signature attribute in class file %s",
1244             attribute_length, CHECK);
1245         }
1246         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1247       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1248         if (runtime_visible_annotations != NULL) {
1249           classfile_parse_error(
1250             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK);
1251         }
1252         runtime_visible_annotations_length = attribute_length;
1253         runtime_visible_annotations = cfs->get_u1_buffer();
1254         assert(runtime_visible_annotations != NULL, "null visible annotations");
1255         parse_annotations(cp,
1256                           runtime_visible_annotations,
1257                           runtime_visible_annotations_length,
1258                           parsed_annotations,
1259                           _loader_data,
1260                           CHECK);
1261         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
1262       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1263         if (runtime_invisible_annotations_exists) {
1264           classfile_parse_error(
1265             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK);
1266         }
1267         runtime_invisible_annotations_exists = true;
1268         if (PreserveAllAnnotations) {
1269           runtime_invisible_annotations_length = attribute_length;
1270           runtime_invisible_annotations = cfs->get_u1_buffer();
1271           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
1272         }
1273         cfs->skip_u1(attribute_length, CHECK);
1274       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1275         if (runtime_visible_type_annotations != NULL) {
1276           classfile_parse_error(
1277             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK);
1278         }
1279         runtime_visible_type_annotations_length = attribute_length;
1280         runtime_visible_type_annotations = cfs->get_u1_buffer();
1281         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
1282         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1283       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1284         if (runtime_invisible_type_annotations_exists) {
1285           classfile_parse_error(
1286             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK);
1287         } else {
1288           runtime_invisible_type_annotations_exists = true;
1289         }
1290         if (PreserveAllAnnotations) {
1291           runtime_invisible_type_annotations_length = attribute_length;
1292           runtime_invisible_type_annotations = cfs->get_u1_buffer();
1293           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
1294         }
1295         cfs->skip_u1(attribute_length, CHECK);
1296       } else {
1297         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1298       }
1299     } else {
1300       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1301     }
1302   }
1303 
1304   *constantvalue_index_addr = constantvalue_index;
1305   *is_synthetic_addr = is_synthetic;
1306   *generic_signature_index_addr = generic_signature_index;
1307   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1308                                             runtime_visible_annotations_length,
1309                                             runtime_invisible_annotations,
1310                                             runtime_invisible_annotations_length,
1311                                             CHECK);
1312   parsed_annotations->set_field_annotations(a);
1313   a = assemble_annotations(runtime_visible_type_annotations,
1314                            runtime_visible_type_annotations_length,
1315                            runtime_invisible_type_annotations,
1316                            runtime_invisible_type_annotations_length,
1317                            CHECK);
1318   parsed_annotations->set_field_type_annotations(a);
1319   return;
1320 }
1321 
1322 
1323 // Field allocation types. Used for computing field offsets.
1324 
1325 enum FieldAllocationType {
1326   STATIC_OOP,           // Oops
1327   STATIC_BYTE,          // Boolean, Byte, char
1328   STATIC_SHORT,         // shorts
1329   STATIC_WORD,          // ints
1330   STATIC_DOUBLE,        // aligned long or double
1331   NONSTATIC_OOP,
1332   NONSTATIC_BYTE,
1333   NONSTATIC_SHORT,
1334   NONSTATIC_WORD,
1335   NONSTATIC_DOUBLE,
1336   MAX_FIELD_ALLOCATION_TYPE,
1337   BAD_ALLOCATION_TYPE = -1
1338 };
1339 
1340 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1341   BAD_ALLOCATION_TYPE, // 0
1342   BAD_ALLOCATION_TYPE, // 1
1343   BAD_ALLOCATION_TYPE, // 2
1344   BAD_ALLOCATION_TYPE, // 3
1345   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1346   NONSTATIC_SHORT,     // T_CHAR        =  5,
1347   NONSTATIC_WORD,      // T_FLOAT       =  6,
1348   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1349   NONSTATIC_BYTE,      // T_BYTE        =  8,
1350   NONSTATIC_SHORT,     // T_SHORT       =  9,
1351   NONSTATIC_WORD,      // T_INT         = 10,
1352   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1353   NONSTATIC_OOP,       // T_OBJECT      = 12,
1354   NONSTATIC_OOP,       // T_ARRAY       = 13,
1355   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1356   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1357   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1358   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1359   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1360   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1361   BAD_ALLOCATION_TYPE, // 0
1362   BAD_ALLOCATION_TYPE, // 1
1363   BAD_ALLOCATION_TYPE, // 2
1364   BAD_ALLOCATION_TYPE, // 3
1365   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1366   STATIC_SHORT,        // T_CHAR        =  5,
1367   STATIC_WORD,         // T_FLOAT       =  6,
1368   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1369   STATIC_BYTE,         // T_BYTE        =  8,
1370   STATIC_SHORT,        // T_SHORT       =  9,
1371   STATIC_WORD,         // T_INT         = 10,
1372   STATIC_DOUBLE,       // T_LONG        = 11,
1373   STATIC_OOP,          // T_OBJECT      = 12,
1374   STATIC_OOP,          // T_ARRAY       = 13,
1375   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1376   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1377   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1378   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1379   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1380   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1381 };
1382 
1383 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1384   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1385   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1386   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1387   return result;
1388 }
1389 
1390 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1391  public:
1392   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1393 
1394   FieldAllocationCount() {
1395     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1396       count[i] = 0;
1397     }
1398   }
1399 
1400   FieldAllocationType update(bool is_static, BasicType type) {
1401     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1402     // Make sure there is no overflow with injected fields.
1403     assert(count[atype] < 0xFFFF, "More than 65535 fields");
1404     count[atype]++;
1405     return atype;
1406   }
1407 };
1408 
1409 // Side-effects: populates the _fields, _fields_annotations,
1410 // _fields_type_annotations fields
1411 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1412                                    bool is_interface,
1413                                    FieldAllocationCount* const fac,
1414                                    ConstantPool* cp,
1415                                    const int cp_size,
1416                                    u2* const java_fields_count_ptr,
1417                                    TRAPS) {
1418 
1419   assert(cfs != NULL, "invariant");
1420   assert(fac != NULL, "invariant");
1421   assert(cp != NULL, "invariant");
1422   assert(java_fields_count_ptr != NULL, "invariant");
1423 
1424   assert(NULL == _fields, "invariant");
1425   assert(NULL == _fields_annotations, "invariant");
1426   assert(NULL == _fields_type_annotations, "invariant");
1427 
1428   cfs->guarantee_more(2, CHECK);  // length
1429   const u2 length = cfs->get_u2_fast();
1430   *java_fields_count_ptr = length;
1431 
1432   int num_injected = 0;
1433   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1434                                                                   &num_injected);
1435   const int total_fields = length + num_injected;
1436 
1437   // The field array starts with tuples of shorts
1438   // [access, name index, sig index, initial value index, byte offset].
1439   // A generic signature slot only exists for field with generic
1440   // signature attribute. And the access flag is set with
1441   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1442   // signature slots are at the end of the field array and after all
1443   // other fields data.
1444   //
1445   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1446   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1447   //       ...
1448   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1449   //       [generic signature index]
1450   //       [generic signature index]
1451   //       ...
1452   //
1453   // Allocate a temporary resource array for field data. For each field,
1454   // a slot is reserved in the temporary array for the generic signature
1455   // index. After parsing all fields, the data are copied to a permanent
1456   // array and any unused slots will be discarded.
1457   ResourceMark rm(THREAD);
1458   u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1459                                               u2,
1460                                               total_fields * (FieldInfo::field_slots + 1));
1461 
1462   // The generic signature slots start after all other fields' data.
1463   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1464   int num_generic_signature = 0;
1465   for (int n = 0; n < length; n++) {
1466     // access_flags, name_index, descriptor_index, attributes_count
1467     cfs->guarantee_more(8, CHECK);
1468 
1469     AccessFlags access_flags;
1470     const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1471     verify_legal_field_modifiers(flags, is_interface, CHECK);
1472     access_flags.set_flags(flags);
1473 
1474     const u2 name_index = cfs->get_u2_fast();
1475     check_property(valid_symbol_at(name_index),
1476       "Invalid constant pool index %u for field name in class file %s",
1477       name_index, CHECK);
1478     const Symbol* const name = cp->symbol_at(name_index);
1479     verify_legal_field_name(name, CHECK);
1480 
1481     const u2 signature_index = cfs->get_u2_fast();
1482     check_property(valid_symbol_at(signature_index),
1483       "Invalid constant pool index %u for field signature in class file %s",
1484       signature_index, CHECK);
1485     const Symbol* const sig = cp->symbol_at(signature_index);
1486     verify_legal_field_signature(name, sig, CHECK);
1487 
1488     u2 constantvalue_index = 0;
1489     bool is_synthetic = false;
1490     u2 generic_signature_index = 0;
1491     const bool is_static = access_flags.is_static();
1492     FieldAnnotationCollector parsed_annotations(_loader_data);
1493 
1494     const u2 attributes_count = cfs->get_u2_fast();
1495     if (attributes_count > 0) {
1496       parse_field_attributes(cfs,
1497                              attributes_count,
1498                              is_static,
1499                              signature_index,
1500                              &constantvalue_index,
1501                              &is_synthetic,
1502                              &generic_signature_index,
1503                              &parsed_annotations,
1504                              CHECK);
1505 
1506       if (parsed_annotations.field_annotations() != NULL) {
1507         if (_fields_annotations == NULL) {
1508           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1509                                              _loader_data, length, NULL,
1510                                              CHECK);
1511         }
1512         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1513         parsed_annotations.set_field_annotations(NULL);
1514       }
1515       if (parsed_annotations.field_type_annotations() != NULL) {
1516         if (_fields_type_annotations == NULL) {
1517           _fields_type_annotations =
1518             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1519                                                          length,
1520                                                          NULL,
1521                                                          CHECK);
1522         }
1523         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1524         parsed_annotations.set_field_type_annotations(NULL);
1525       }
1526 
1527       if (is_synthetic) {
1528         access_flags.set_is_synthetic();
1529       }
1530       if (generic_signature_index != 0) {
1531         access_flags.set_field_has_generic_signature();
1532         fa[generic_signature_slot] = generic_signature_index;
1533         generic_signature_slot ++;
1534         num_generic_signature ++;
1535       }
1536     }
1537 
1538     FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1539     field->initialize(access_flags.as_short(),
1540                       name_index,
1541                       signature_index,
1542                       constantvalue_index);
1543     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1544 
1545     // Remember how many oops we encountered and compute allocation type
1546     const FieldAllocationType atype = fac->update(is_static, type);
1547     field->set_allocation_type(atype);
1548 
1549     // After field is initialized with type, we can augment it with aux info
1550     if (parsed_annotations.has_any_annotations())
1551       parsed_annotations.apply_to(field);
1552   }
1553 
1554   int index = length;
1555   if (num_injected != 0) {
1556     for (int n = 0; n < num_injected; n++) {
1557       // Check for duplicates
1558       if (injected[n].may_be_java) {
1559         const Symbol* const name      = injected[n].name();
1560         const Symbol* const signature = injected[n].signature();
1561         bool duplicate = false;
1562         for (int i = 0; i < length; i++) {
1563           const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1564           if (name      == cp->symbol_at(f->name_index()) &&
1565               signature == cp->symbol_at(f->signature_index())) {
1566             // Symbol is desclared in Java so skip this one
1567             duplicate = true;
1568             break;
1569           }
1570         }
1571         if (duplicate) {
1572           // These will be removed from the field array at the end
1573           continue;
1574         }
1575       }
1576 
1577       // Injected field
1578       FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1579       field->initialize(JVM_ACC_FIELD_INTERNAL,
1580                         injected[n].name_index,
1581                         injected[n].signature_index,
1582                         0);
1583 
1584       const BasicType type = FieldType::basic_type(injected[n].signature());
1585 
1586       // Remember how many oops we encountered and compute allocation type
1587       const FieldAllocationType atype = fac->update(false, type);
1588       field->set_allocation_type(atype);
1589       index++;
1590     }
1591   }
1592 
1593   assert(NULL == _fields, "invariant");
1594 
1595   _fields =
1596     MetadataFactory::new_array<u2>(_loader_data,
1597                                    index * FieldInfo::field_slots + num_generic_signature,
1598                                    CHECK);
1599   // Sometimes injected fields already exist in the Java source so
1600   // the fields array could be too long.  In that case the
1601   // fields array is trimed. Also unused slots that were reserved
1602   // for generic signature indexes are discarded.
1603   {
1604     int i = 0;
1605     for (; i < index * FieldInfo::field_slots; i++) {
1606       _fields->at_put(i, fa[i]);
1607     }
1608     for (int j = total_fields * FieldInfo::field_slots;
1609          j < generic_signature_slot; j++) {
1610       _fields->at_put(i++, fa[j]);
1611     }
1612     assert(_fields->length() == i, "");
1613   }
1614 
1615   if (_need_verify && length > 1) {
1616     // Check duplicated fields
1617     ResourceMark rm(THREAD);
1618     NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
1619       THREAD, NameSigHash*, HASH_ROW_SIZE);
1620     initialize_hashtable(names_and_sigs);
1621     bool dup = false;
1622     {
1623       debug_only(NoSafepointVerifier nsv;)
1624       for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
1625         const Symbol* const name = fs.name();
1626         const Symbol* const sig = fs.signature();
1627         // If no duplicates, add name/signature in hashtable names_and_sigs.
1628         if (!put_after_lookup(name, sig, names_and_sigs)) {
1629           dup = true;
1630           break;
1631         }
1632       }
1633     }
1634     if (dup) {
1635       classfile_parse_error("Duplicate field name&signature in class file %s",
1636                             CHECK);
1637     }
1638   }
1639 }
1640 
1641 
1642 static void copy_u2_with_conversion(u2* dest, const u2* src, int length) {
1643   while (length-- > 0) {
1644     *dest++ = Bytes::get_Java_u2((u1*) (src++));
1645   }
1646 }
1647 
1648 const u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1649                                                  u4 code_length,
1650                                                  u4 exception_table_length,
1651                                                  TRAPS) {
1652   assert(cfs != NULL, "invariant");
1653 
1654   const u2* const exception_table_start = cfs->get_u2_buffer();
1655   assert(exception_table_start != NULL, "null exception table");
1656 
1657   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1658                                                                // end_pc,
1659                                                                // handler_pc,
1660                                                                // catch_type_index
1661 
1662   // Will check legal target after parsing code array in verifier.
1663   if (_need_verify) {
1664     for (unsigned int i = 0; i < exception_table_length; i++) {
1665       const u2 start_pc = cfs->get_u2_fast();
1666       const u2 end_pc = cfs->get_u2_fast();
1667       const u2 handler_pc = cfs->get_u2_fast();
1668       const u2 catch_type_index = cfs->get_u2_fast();
1669       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1670                          "Illegal exception table range in class file %s",
1671                          CHECK_NULL);
1672       guarantee_property(handler_pc < code_length,
1673                          "Illegal exception table handler in class file %s",
1674                          CHECK_NULL);
1675       if (catch_type_index != 0) {
1676         guarantee_property(valid_klass_reference_at(catch_type_index),
1677                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1678       }
1679     }
1680   } else {
1681     cfs->skip_u2_fast(exception_table_length * 4);
1682   }
1683   return exception_table_start;
1684 }
1685 
1686 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1687                                              u4 code_length,
1688                                              CompressedLineNumberWriteStream**const write_stream,
1689                                              TRAPS) {
1690 
1691   const ClassFileStream* const cfs = _stream;
1692   unsigned int num_entries = cfs->get_u2(CHECK);
1693 
1694   // Each entry is a u2 start_pc, and a u2 line_number
1695   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1696 
1697   // Verify line number attribute and table length
1698   check_property(
1699     code_attribute_length == sizeof(u2) + length_in_bytes,
1700     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1701 
1702   cfs->guarantee_more(length_in_bytes, CHECK);
1703 
1704   if ((*write_stream) == NULL) {
1705     if (length_in_bytes > fixed_buffer_size) {
1706       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1707     } else {
1708       (*write_stream) = new CompressedLineNumberWriteStream(
1709         _linenumbertable_buffer, fixed_buffer_size);
1710     }
1711   }
1712 
1713   while (num_entries-- > 0) {
1714     const u2 bci  = cfs->get_u2_fast(); // start_pc
1715     const u2 line = cfs->get_u2_fast(); // line_number
1716     guarantee_property(bci < code_length,
1717         "Invalid pc in LineNumberTable in class file %s", CHECK);
1718     (*write_stream)->write_pair(bci, line);
1719   }
1720 }
1721 
1722 
1723 class LVT_Hash : public AllStatic {
1724  public:
1725 
1726   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1727   /*
1728    * 3-tuple start_bci/length/slot has to be unique key,
1729    * so the following comparison seems to be redundant:
1730    *       && elem->name_cp_index == entry->_elem->name_cp_index
1731    */
1732     return (e0.start_bci     == e1.start_bci &&
1733             e0.length        == e1.length &&
1734             e0.name_cp_index == e1.name_cp_index &&
1735             e0.slot          == e1.slot);
1736   }
1737 
1738   static unsigned int hash(LocalVariableTableElement const& e0) {
1739     unsigned int raw_hash = e0.start_bci;
1740 
1741     raw_hash = e0.length        + raw_hash * 37;
1742     raw_hash = e0.name_cp_index + raw_hash * 37;
1743     raw_hash = e0.slot          + raw_hash * 37;
1744 
1745     return raw_hash;
1746   }
1747 };
1748 
1749 
1750 // Class file LocalVariableTable elements.
1751 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC {
1752  public:
1753   u2 start_bci;
1754   u2 length;
1755   u2 name_cp_index;
1756   u2 descriptor_cp_index;
1757   u2 slot;
1758 };
1759 
1760 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1761                              LocalVariableTableElement* const lvt) {
1762   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1763   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1764   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1765   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1766   lvt->signature_cp_index  = 0;
1767   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1768 }
1769 
1770 // Function is used to parse both attributes:
1771 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1772 const u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1773                                                      u4 code_length,
1774                                                      u2 max_locals,
1775                                                      u4 code_attribute_length,
1776                                                      u2* const localvariable_table_length,
1777                                                      bool isLVTT,
1778                                                      TRAPS) {
1779   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1780   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1781   const unsigned int size =
1782     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2);
1783 
1784   const ConstantPool* const cp = _cp;
1785 
1786   // Verify local variable table attribute has right length
1787   if (_need_verify) {
1788     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1789                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1790   }
1791 
1792   const u2* const localvariable_table_start = cfs->get_u2_buffer();
1793   assert(localvariable_table_start != NULL, "null local variable table");
1794   if (!_need_verify) {
1795     cfs->skip_u2_fast(size);
1796   } else {
1797     cfs->guarantee_more(size * 2, CHECK_NULL);
1798     for(int i = 0; i < (*localvariable_table_length); i++) {
1799       const u2 start_pc = cfs->get_u2_fast();
1800       const u2 length = cfs->get_u2_fast();
1801       const u2 name_index = cfs->get_u2_fast();
1802       const u2 descriptor_index = cfs->get_u2_fast();
1803       const u2 index = cfs->get_u2_fast();
1804       // Assign to a u4 to avoid overflow
1805       const u4 end_pc = (u4)start_pc + (u4)length;
1806 
1807       if (start_pc >= code_length) {
1808         classfile_parse_error(
1809           "Invalid start_pc %u in %s in class file %s",
1810           start_pc, tbl_name, CHECK_NULL);
1811       }
1812       if (end_pc > code_length) {
1813         classfile_parse_error(
1814           "Invalid length %u in %s in class file %s",
1815           length, tbl_name, CHECK_NULL);
1816       }
1817       const int cp_size = cp->length();
1818       guarantee_property(valid_symbol_at(name_index),
1819         "Name index %u in %s has bad constant type in class file %s",
1820         name_index, tbl_name, CHECK_NULL);
1821       guarantee_property(valid_symbol_at(descriptor_index),
1822         "Signature index %u in %s has bad constant type in class file %s",
1823         descriptor_index, tbl_name, CHECK_NULL);
1824 
1825       const Symbol* const name = cp->symbol_at(name_index);
1826       const Symbol* const sig = cp->symbol_at(descriptor_index);
1827       verify_legal_field_name(name, CHECK_NULL);
1828       u2 extra_slot = 0;
1829       if (!isLVTT) {
1830         verify_legal_field_signature(name, sig, CHECK_NULL);
1831 
1832         // 4894874: check special cases for double and long local variables
1833         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1834             sig == vmSymbols::type_signature(T_LONG)) {
1835           extra_slot = 1;
1836         }
1837       }
1838       guarantee_property((index + extra_slot) < max_locals,
1839                           "Invalid index %u in %s in class file %s",
1840                           index, tbl_name, CHECK_NULL);
1841     }
1842   }
1843   return localvariable_table_start;
1844 }
1845 
1846 
1847 void ClassFileParser::parse_type_array(u2 array_length,
1848                                        u4 code_length,
1849                                        u4* const u1_index,
1850                                        u4* const u2_index,
1851                                        u1* const u1_array,
1852                                        u2* const u2_array,
1853                                        TRAPS) {
1854   const ClassFileStream* const cfs = _stream;
1855   u2 index = 0; // index in the array with long/double occupying two slots
1856   u4 i1 = *u1_index;
1857   u4 i2 = *u2_index + 1;
1858   for(int i = 0; i < array_length; i++) {
1859     const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK);
1860     index++;
1861     if (tag == ITEM_Long || tag == ITEM_Double) {
1862       index++;
1863     } else if (tag == ITEM_Object) {
1864       const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK);
1865       guarantee_property(valid_klass_reference_at(class_index),
1866                          "Bad class index %u in StackMap in class file %s",
1867                          class_index, CHECK);
1868     } else if (tag == ITEM_Uninitialized) {
1869       const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK);
1870       guarantee_property(
1871         offset < code_length,
1872         "Bad uninitialized type offset %u in StackMap in class file %s",
1873         offset, CHECK);
1874     } else {
1875       guarantee_property(
1876         tag <= (u1)ITEM_Uninitialized,
1877         "Unknown variable type %u in StackMap in class file %s",
1878         tag, CHECK);
1879     }
1880   }
1881   u2_array[*u2_index] = index;
1882   *u1_index = i1;
1883   *u2_index = i2;
1884 }
1885 
1886 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1887                                       u4 code_attribute_length,
1888                                       bool need_verify,
1889                                       TRAPS) {
1890   assert(cfs != NULL, "invariant");
1891 
1892   if (0 == code_attribute_length) {
1893     return NULL;
1894   }
1895 
1896   const u1* const stackmap_table_start = cfs->get_u1_buffer();
1897   assert(stackmap_table_start != NULL, "null stackmap table");
1898 
1899   // check code_attribute_length first
1900   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1901 
1902   if (!need_verify && !DumpSharedSpaces) {
1903     return NULL;
1904   }
1905   return stackmap_table_start;
1906 }
1907 
1908 const u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1909                                                     u2* const checked_exceptions_length,
1910                                                     u4 method_attribute_length,
1911                                                     TRAPS) {
1912   assert(cfs != NULL, "invariant");
1913   assert(checked_exceptions_length != NULL, "invariant");
1914 
1915   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1916   *checked_exceptions_length = cfs->get_u2_fast();
1917   const unsigned int size =
1918     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1919   const u2* const checked_exceptions_start = cfs->get_u2_buffer();
1920   assert(checked_exceptions_start != NULL, "null checked exceptions");
1921   if (!_need_verify) {
1922     cfs->skip_u2_fast(size);
1923   } else {
1924     // Verify each value in the checked exception table
1925     u2 checked_exception;
1926     const u2 len = *checked_exceptions_length;
1927     cfs->guarantee_more(2 * len, CHECK_NULL);
1928     for (int i = 0; i < len; i++) {
1929       checked_exception = cfs->get_u2_fast();
1930       check_property(
1931         valid_klass_reference_at(checked_exception),
1932         "Exception name has bad type at constant pool %u in class file %s",
1933         checked_exception, CHECK_NULL);
1934     }
1935   }
1936   // check exceptions attribute length
1937   if (_need_verify) {
1938     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1939                                                    sizeof(u2) * size),
1940                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1941   }
1942   return checked_exceptions_start;
1943 }
1944 
1945 void ClassFileParser::throwIllegalSignature(const char* type,
1946                                             const Symbol* name,
1947                                             const Symbol* sig,
1948                                             TRAPS) const {
1949   assert(name != NULL, "invariant");
1950   assert(sig != NULL, "invariant");
1951 
1952   ResourceMark rm(THREAD);
1953   Exceptions::fthrow(THREAD_AND_LOCATION,
1954       vmSymbols::java_lang_ClassFormatError(),
1955       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1956       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1957 }
1958 
1959 AnnotationCollector::ID
1960 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1961                                       const Symbol* name) {
1962   const vmSymbols::SID sid = vmSymbols::find_sid(name);
1963   // Privileged code can use all annotations.  Other code silently drops some.
1964   const bool privileged = loader_data->is_the_null_class_loader_data() ||
1965                           loader_data->is_ext_class_loader_data() ||
1966                           loader_data->is_anonymous();
1967   switch (sid) {
1968     case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): {
1969       if (_location != _in_method)  break;  // only allow for methods
1970       if (!privileged)              break;  // only allow in privileged code
1971       return _method_CallerSensitive;
1972     }
1973     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1974       if (_location != _in_method)  break;  // only allow for methods
1975       if (!privileged)              break;  // only allow in privileged code
1976       return _method_ForceInline;
1977     }
1978     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1979       if (_location != _in_method)  break;  // only allow for methods
1980       if (!privileged)              break;  // only allow in privileged code
1981       return _method_DontInline;
1982     }
1983     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1984       if (_location != _in_method)  break;  // only allow for methods
1985       if (!privileged)              break;  // only allow in privileged code
1986       return _method_InjectedProfile;
1987     }
1988     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1989       if (_location != _in_method)  break;  // only allow for methods
1990       if (!privileged)              break;  // only allow in privileged code
1991       return _method_LambdaForm_Compiled;
1992     }
1993     case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): {
1994       if (_location != _in_method)  break;  // only allow for methods
1995       if (!privileged)              break;  // only allow in privileged code
1996       return _method_LambdaForm_Hidden;
1997     }
1998     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): {
1999       if (_location != _in_method)  break;  // only allow for methods
2000       if (!privileged)              break;  // only allow in privileged code
2001       return _method_HotSpotIntrinsicCandidate;
2002     }
2003 #if INCLUDE_JVMCI
2004     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_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 #endif
2010     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
2011       if (_location != _in_field)   break;  // only allow for fields
2012       if (!privileged)              break;  // only allow in privileged code
2013       return _field_Stable;
2014     }
2015     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
2016       if (_location != _in_field && _location != _in_class) {
2017         break;  // only allow for fields and classes
2018       }
2019       if (!EnableContended || (RestrictContended && !privileged)) {
2020         break;  // honor privileges
2021       }
2022       return _jdk_internal_vm_annotation_Contended;
2023     }
2024     case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
2025       if (_location != _in_method)  break;  // only allow for methods
2026       if (RestrictReservedStack && !privileged) break; // honor privileges
2027       return _jdk_internal_vm_annotation_ReservedStackAccess;
2028     }
2029     default: {
2030       break;
2031     }
2032   }
2033   return AnnotationCollector::_unknown;
2034 }
2035 
2036 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2037   if (is_contended())
2038     f->set_contended_group(contended_group());
2039   if (is_stable())
2040     f->set_stable(true);
2041 }
2042 
2043 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2044   // If there's an error deallocate metadata for field annotations
2045   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2046   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2047 }
2048 
2049 void MethodAnnotationCollector::apply_to(methodHandle m) {
2050   if (has_annotation(_method_CallerSensitive))
2051     m->set_caller_sensitive(true);
2052   if (has_annotation(_method_ForceInline))
2053     m->set_force_inline(true);
2054   if (has_annotation(_method_DontInline))
2055     m->set_dont_inline(true);
2056   if (has_annotation(_method_InjectedProfile))
2057     m->set_has_injected_profile(true);
2058   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2059     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2060   if (has_annotation(_method_LambdaForm_Hidden))
2061     m->set_hidden(true);
2062   if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic())
2063     m->set_intrinsic_candidate(true);
2064   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2065     m->set_has_reserved_stack_access(true);
2066 }
2067 
2068 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2069   assert(ik != NULL, "invariant");
2070   ik->set_is_contended(is_contended());
2071 }
2072 
2073 #define MAX_ARGS_SIZE 255
2074 #define MAX_CODE_SIZE 65535
2075 #define INITIAL_MAX_LVT_NUMBER 256
2076 
2077 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2078  *
2079  * Rules for LVT's and LVTT's are:
2080  *   - There can be any number of LVT's and LVTT's.
2081  *   - If there are n LVT's, it is the same as if there was just
2082  *     one LVT containing all the entries from the n LVT's.
2083  *   - There may be no more than one LVT entry per local variable.
2084  *     Two LVT entries are 'equal' if these fields are the same:
2085  *        start_pc, length, name, slot
2086  *   - There may be no more than one LVTT entry per each LVT entry.
2087  *     Each LVTT entry has to match some LVT entry.
2088  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2089  */
2090 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2091                                                int lvt_cnt,
2092                                                u2* const localvariable_table_length,
2093                                                const u2**const localvariable_table_start,
2094                                                int lvtt_cnt,
2095                                                u2* const localvariable_type_table_length,
2096                                                const u2**const localvariable_type_table_start,
2097                                                TRAPS) {
2098 
2099   ResourceMark rm(THREAD);
2100 
2101   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2102                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2103 
2104   LVT_HashTable* const table = new LVT_HashTable();
2105 
2106   // To fill LocalVariableTable in
2107   const Classfile_LVT_Element* cf_lvt;
2108   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2109 
2110   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2111     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2112     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2113       copy_lvt_element(&cf_lvt[idx], lvt);
2114       // If no duplicates, add LVT elem in hashtable.
2115       if (table->put(*lvt, lvt) == false
2116           && _need_verify
2117           && _major_version >= JAVA_1_5_VERSION) {
2118         classfile_parse_error("Duplicated LocalVariableTable attribute "
2119                               "entry for '%s' in class file %s",
2120                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2121                                CHECK);
2122       }
2123     }
2124   }
2125 
2126   // To merge LocalVariableTable and LocalVariableTypeTable
2127   const Classfile_LVT_Element* cf_lvtt;
2128   LocalVariableTableElement lvtt_elem;
2129 
2130   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2131     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2132     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2133       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2134       LocalVariableTableElement** entry = table->get(lvtt_elem);
2135       if (entry == NULL) {
2136         if (_need_verify) {
2137           classfile_parse_error("LVTT entry for '%s' in class file %s "
2138                                 "does not match any LVT entry",
2139                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2140                                  CHECK);
2141         }
2142       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2143         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2144                               "entry for '%s' in class file %s",
2145                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2146                                CHECK);
2147       } else {
2148         // to add generic signatures into LocalVariableTable
2149         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2150       }
2151     }
2152   }
2153 }
2154 
2155 
2156 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2157                                        const u1* runtime_visible_annotations,
2158                                        int runtime_visible_annotations_length,
2159                                        const u1* runtime_invisible_annotations,
2160                                        int runtime_invisible_annotations_length,
2161                                        const u1* runtime_visible_parameter_annotations,
2162                                        int runtime_visible_parameter_annotations_length,
2163                                        const u1* runtime_invisible_parameter_annotations,
2164                                        int runtime_invisible_parameter_annotations_length,
2165                                        const u1* runtime_visible_type_annotations,
2166                                        int runtime_visible_type_annotations_length,
2167                                        const u1* runtime_invisible_type_annotations,
2168                                        int runtime_invisible_type_annotations_length,
2169                                        const u1* annotation_default,
2170                                        int annotation_default_length,
2171                                        TRAPS) {
2172 
2173   AnnotationArray* a;
2174 
2175   if (runtime_visible_annotations_length +
2176       runtime_invisible_annotations_length > 0) {
2177      a = assemble_annotations(runtime_visible_annotations,
2178                               runtime_visible_annotations_length,
2179                               runtime_invisible_annotations,
2180                               runtime_invisible_annotations_length,
2181                               CHECK);
2182      cm->set_method_annotations(a);
2183   }
2184 
2185   if (runtime_visible_parameter_annotations_length +
2186       runtime_invisible_parameter_annotations_length > 0) {
2187     a = assemble_annotations(runtime_visible_parameter_annotations,
2188                              runtime_visible_parameter_annotations_length,
2189                              runtime_invisible_parameter_annotations,
2190                              runtime_invisible_parameter_annotations_length,
2191                              CHECK);
2192     cm->set_parameter_annotations(a);
2193   }
2194 
2195   if (annotation_default_length > 0) {
2196     a = assemble_annotations(annotation_default,
2197                              annotation_default_length,
2198                              NULL,
2199                              0,
2200                              CHECK);
2201     cm->set_default_annotations(a);
2202   }
2203 
2204   if (runtime_visible_type_annotations_length +
2205       runtime_invisible_type_annotations_length > 0) {
2206     a = assemble_annotations(runtime_visible_type_annotations,
2207                              runtime_visible_type_annotations_length,
2208                              runtime_invisible_type_annotations,
2209                              runtime_invisible_type_annotations_length,
2210                              CHECK);
2211     cm->set_type_annotations(a);
2212   }
2213 }
2214 
2215 
2216 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2217 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2218 // Method* to save footprint, so we only know the size of the resulting Method* when the
2219 // entire method attribute is parsed.
2220 //
2221 // The promoted_flags parameter is used to pass relevant access_flags
2222 // from the method back up to the containing klass. These flag values
2223 // are added to klass's access_flags.
2224 
2225 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2226                                       bool is_interface,
2227                                       const ConstantPool* cp,
2228                                       AccessFlags* const promoted_flags,
2229                                       TRAPS) {
2230   assert(cfs != NULL, "invariant");
2231   assert(cp != NULL, "invariant");
2232   assert(promoted_flags != NULL, "invariant");
2233 
2234   ResourceMark rm(THREAD);
2235   // Parse fixed parts:
2236   // access_flags, name_index, descriptor_index, attributes_count
2237   cfs->guarantee_more(8, CHECK_NULL);
2238 
2239   int flags = cfs->get_u2_fast();
2240   const u2 name_index = cfs->get_u2_fast();
2241   const int cp_size = cp->length();
2242   check_property(
2243     valid_symbol_at(name_index),
2244     "Illegal constant pool index %u for method name in class file %s",
2245     name_index, CHECK_NULL);
2246   const Symbol* const name = cp->symbol_at(name_index);
2247   verify_legal_method_name(name, CHECK_NULL);
2248 
2249   const u2 signature_index = cfs->get_u2_fast();
2250   guarantee_property(
2251     valid_symbol_at(signature_index),
2252     "Illegal constant pool index %u for method signature in class file %s",
2253     signature_index, CHECK_NULL);
2254   const Symbol* const signature = cp->symbol_at(signature_index);
2255 
2256   if (name == vmSymbols::class_initializer_name()) {
2257     // We ignore the other access flags for a valid class initializer.
2258     // (JVM Spec 2nd ed., chapter 4.6)
2259     if (_major_version < 51) { // backward compatibility
2260       flags = JVM_ACC_STATIC;
2261     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2262       flags &= JVM_ACC_STATIC | JVM_ACC_STRICT;
2263     } else {
2264       classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL);
2265     }
2266   } else {
2267     verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2268   }
2269 
2270   if (name == vmSymbols::object_initializer_name() && is_interface) {
2271     classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2272   }
2273 
2274   int args_size = -1;  // only used when _need_verify is true
2275   if (_need_verify) {
2276     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2277                  verify_legal_method_signature(name, signature, CHECK_NULL);
2278     if (args_size > MAX_ARGS_SIZE) {
2279       classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL);
2280     }
2281   }
2282 
2283   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2284 
2285   // Default values for code and exceptions attribute elements
2286   u2 max_stack = 0;
2287   u2 max_locals = 0;
2288   u4 code_length = 0;
2289   const u1* code_start = 0;
2290   u2 exception_table_length = 0;
2291   const u2* exception_table_start = NULL;
2292   Array<int>* exception_handlers = Universe::the_empty_int_array();
2293   u2 checked_exceptions_length = 0;
2294   const u2* checked_exceptions_start = NULL;
2295   CompressedLineNumberWriteStream* linenumber_table = NULL;
2296   int linenumber_table_length = 0;
2297   int total_lvt_length = 0;
2298   u2 lvt_cnt = 0;
2299   u2 lvtt_cnt = 0;
2300   bool lvt_allocated = false;
2301   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2302   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2303   u2* localvariable_table_length = NULL;
2304   const u2** localvariable_table_start = NULL;
2305   u2* localvariable_type_table_length = NULL;
2306   const u2** localvariable_type_table_start = NULL;
2307   int method_parameters_length = -1;
2308   const u1* method_parameters_data = NULL;
2309   bool method_parameters_seen = false;
2310   bool parsed_code_attribute = false;
2311   bool parsed_checked_exceptions_attribute = false;
2312   bool parsed_stackmap_attribute = false;
2313   // stackmap attribute - JDK1.5
2314   const u1* stackmap_data = NULL;
2315   int stackmap_data_length = 0;
2316   u2 generic_signature_index = 0;
2317   MethodAnnotationCollector parsed_annotations;
2318   const u1* runtime_visible_annotations = NULL;
2319   int runtime_visible_annotations_length = 0;
2320   const u1* runtime_invisible_annotations = NULL;
2321   int runtime_invisible_annotations_length = 0;
2322   const u1* runtime_visible_parameter_annotations = NULL;
2323   int runtime_visible_parameter_annotations_length = 0;
2324   const u1* runtime_invisible_parameter_annotations = NULL;
2325   int runtime_invisible_parameter_annotations_length = 0;
2326   const u1* runtime_visible_type_annotations = NULL;
2327   int runtime_visible_type_annotations_length = 0;
2328   const u1* runtime_invisible_type_annotations = NULL;
2329   int runtime_invisible_type_annotations_length = 0;
2330   bool runtime_invisible_annotations_exists = false;
2331   bool runtime_invisible_type_annotations_exists = false;
2332   bool runtime_invisible_parameter_annotations_exists = false;
2333   const u1* annotation_default = NULL;
2334   int annotation_default_length = 0;
2335 
2336   // Parse code and exceptions attribute
2337   u2 method_attributes_count = cfs->get_u2_fast();
2338   while (method_attributes_count--) {
2339     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2340     const u2 method_attribute_name_index = cfs->get_u2_fast();
2341     const u4 method_attribute_length = cfs->get_u4_fast();
2342     check_property(
2343       valid_symbol_at(method_attribute_name_index),
2344       "Invalid method attribute name index %u in class file %s",
2345       method_attribute_name_index, CHECK_NULL);
2346 
2347     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2348     if (method_attribute_name == vmSymbols::tag_code()) {
2349       // Parse Code attribute
2350       if (_need_verify) {
2351         guarantee_property(
2352             !access_flags.is_native() && !access_flags.is_abstract(),
2353                         "Code attribute in native or abstract methods in class file %s",
2354                          CHECK_NULL);
2355       }
2356       if (parsed_code_attribute) {
2357         classfile_parse_error("Multiple Code attributes in class file %s",
2358                               CHECK_NULL);
2359       }
2360       parsed_code_attribute = true;
2361 
2362       // Stack size, locals size, and code size
2363       if (_major_version == 45 && _minor_version <= 2) {
2364         cfs->guarantee_more(4, CHECK_NULL);
2365         max_stack = cfs->get_u1_fast();
2366         max_locals = cfs->get_u1_fast();
2367         code_length = cfs->get_u2_fast();
2368       } else {
2369         cfs->guarantee_more(8, CHECK_NULL);
2370         max_stack = cfs->get_u2_fast();
2371         max_locals = cfs->get_u2_fast();
2372         code_length = cfs->get_u4_fast();
2373       }
2374       if (_need_verify) {
2375         guarantee_property(args_size <= max_locals,
2376                            "Arguments can't fit into locals in class file %s",
2377                            CHECK_NULL);
2378         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2379                            "Invalid method Code length %u in class file %s",
2380                            code_length, CHECK_NULL);
2381       }
2382       // Code pointer
2383       code_start = cfs->get_u1_buffer();
2384       assert(code_start != NULL, "null code start");
2385       cfs->guarantee_more(code_length, CHECK_NULL);
2386       cfs->skip_u1_fast(code_length);
2387 
2388       // Exception handler table
2389       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2390       exception_table_length = cfs->get_u2_fast();
2391       if (exception_table_length > 0) {
2392         exception_table_start = parse_exception_table(cfs,
2393                                                       code_length,
2394                                                       exception_table_length,
2395                                                       CHECK_NULL);
2396       }
2397 
2398       // Parse additional attributes in code attribute
2399       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2400       u2 code_attributes_count = cfs->get_u2_fast();
2401 
2402       unsigned int calculated_attribute_length = 0;
2403 
2404       if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) {
2405         calculated_attribute_length =
2406             sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2407       } else {
2408         // max_stack, locals and length are smaller in pre-version 45.2 classes
2409         calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2);
2410       }
2411       calculated_attribute_length +=
2412         code_length +
2413         sizeof(exception_table_length) +
2414         sizeof(code_attributes_count) +
2415         exception_table_length *
2416             ( sizeof(u2) +   // start_pc
2417               sizeof(u2) +   // end_pc
2418               sizeof(u2) +   // handler_pc
2419               sizeof(u2) );  // catch_type_index
2420 
2421       while (code_attributes_count--) {
2422         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2423         const u2 code_attribute_name_index = cfs->get_u2_fast();
2424         const u4 code_attribute_length = cfs->get_u4_fast();
2425         calculated_attribute_length += code_attribute_length +
2426                                        sizeof(code_attribute_name_index) +
2427                                        sizeof(code_attribute_length);
2428         check_property(valid_symbol_at(code_attribute_name_index),
2429                        "Invalid code attribute name index %u in class file %s",
2430                        code_attribute_name_index,
2431                        CHECK_NULL);
2432         if (LoadLineNumberTables &&
2433             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2434           // Parse and compress line number table
2435           parse_linenumber_table(code_attribute_length,
2436                                  code_length,
2437                                  &linenumber_table,
2438                                  CHECK_NULL);
2439 
2440         } else if (LoadLocalVariableTables &&
2441                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2442           // Parse local variable table
2443           if (!lvt_allocated) {
2444             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2445               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2446             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2447               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2448             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2449               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2450             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2451               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2452             lvt_allocated = true;
2453           }
2454           if (lvt_cnt == max_lvt_cnt) {
2455             max_lvt_cnt <<= 1;
2456             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2457             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2458           }
2459           localvariable_table_start[lvt_cnt] =
2460             parse_localvariable_table(cfs,
2461                                       code_length,
2462                                       max_locals,
2463                                       code_attribute_length,
2464                                       &localvariable_table_length[lvt_cnt],
2465                                       false,    // is not LVTT
2466                                       CHECK_NULL);
2467           total_lvt_length += localvariable_table_length[lvt_cnt];
2468           lvt_cnt++;
2469         } else if (LoadLocalVariableTypeTables &&
2470                    _major_version >= JAVA_1_5_VERSION &&
2471                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2472           if (!lvt_allocated) {
2473             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2474               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2475             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2476               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2477             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2478               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2479             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2480               THREAD, const u2*, INITIAL_MAX_LVT_NUMBER);
2481             lvt_allocated = true;
2482           }
2483           // Parse local variable type table
2484           if (lvtt_cnt == max_lvtt_cnt) {
2485             max_lvtt_cnt <<= 1;
2486             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2487             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2488           }
2489           localvariable_type_table_start[lvtt_cnt] =
2490             parse_localvariable_table(cfs,
2491                                       code_length,
2492                                       max_locals,
2493                                       code_attribute_length,
2494                                       &localvariable_type_table_length[lvtt_cnt],
2495                                       true,     // is LVTT
2496                                       CHECK_NULL);
2497           lvtt_cnt++;
2498         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2499                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2500           // Stack map is only needed by the new verifier in JDK1.5.
2501           if (parsed_stackmap_attribute) {
2502             classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL);
2503           }
2504           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL);
2505           stackmap_data_length = code_attribute_length;
2506           parsed_stackmap_attribute = true;
2507         } else {
2508           // Skip unknown attributes
2509           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2510         }
2511       }
2512       // check method attribute length
2513       if (_need_verify) {
2514         guarantee_property(method_attribute_length == calculated_attribute_length,
2515                            "Code segment has wrong length in class file %s",
2516                            CHECK_NULL);
2517       }
2518     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2519       // Parse Exceptions attribute
2520       if (parsed_checked_exceptions_attribute) {
2521         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2522                               CHECK_NULL);
2523       }
2524       parsed_checked_exceptions_attribute = true;
2525       checked_exceptions_start =
2526             parse_checked_exceptions(cfs,
2527                                      &checked_exceptions_length,
2528                                      method_attribute_length,
2529                                      CHECK_NULL);
2530     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2531       // reject multiple method parameters
2532       if (method_parameters_seen) {
2533         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2534                               CHECK_NULL);
2535       }
2536       method_parameters_seen = true;
2537       method_parameters_length = cfs->get_u1_fast();
2538       const u2 real_length = (method_parameters_length * 4u) + 1u;
2539       if (method_attribute_length != real_length) {
2540         classfile_parse_error(
2541           "Invalid MethodParameters method attribute length %u in class file",
2542           method_attribute_length, CHECK_NULL);
2543       }
2544       method_parameters_data = cfs->get_u1_buffer();
2545       cfs->skip_u2_fast(method_parameters_length);
2546       cfs->skip_u2_fast(method_parameters_length);
2547       // ignore this attribute if it cannot be reflected
2548       if (!SystemDictionary::Parameter_klass_loaded())
2549         method_parameters_length = -1;
2550     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2551       if (method_attribute_length != 0) {
2552         classfile_parse_error(
2553           "Invalid Synthetic method attribute length %u in class file %s",
2554           method_attribute_length, CHECK_NULL);
2555       }
2556       // Should we check that there hasn't already been a synthetic attribute?
2557       access_flags.set_is_synthetic();
2558     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2559       if (method_attribute_length != 0) {
2560         classfile_parse_error(
2561           "Invalid Deprecated method attribute length %u in class file %s",
2562           method_attribute_length, CHECK_NULL);
2563       }
2564     } else if (_major_version >= JAVA_1_5_VERSION) {
2565       if (method_attribute_name == vmSymbols::tag_signature()) {
2566         if (method_attribute_length != 2) {
2567           classfile_parse_error(
2568             "Invalid Signature attribute length %u in class file %s",
2569             method_attribute_length, CHECK_NULL);
2570         }
2571         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2572       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2573         if (runtime_visible_annotations != NULL) {
2574           classfile_parse_error(
2575             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2576             CHECK_NULL);
2577         }
2578         runtime_visible_annotations_length = method_attribute_length;
2579         runtime_visible_annotations = cfs->get_u1_buffer();
2580         assert(runtime_visible_annotations != NULL, "null visible annotations");
2581         parse_annotations(cp,
2582                           runtime_visible_annotations,
2583                           runtime_visible_annotations_length,
2584                           &parsed_annotations,
2585                           _loader_data,
2586                           CHECK_NULL);
2587         cfs->skip_u1(runtime_visible_annotations_length, CHECK_NULL);
2588       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2589         if (runtime_invisible_annotations_exists) {
2590           classfile_parse_error(
2591             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2592             CHECK_NULL);
2593         }
2594         runtime_invisible_annotations_exists = true;
2595         if (PreserveAllAnnotations) {
2596           runtime_invisible_annotations_length = method_attribute_length;
2597           runtime_invisible_annotations = cfs->get_u1_buffer();
2598           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
2599         }
2600         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2601       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2602         if (runtime_visible_parameter_annotations != NULL) {
2603           classfile_parse_error(
2604             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2605             CHECK_NULL);
2606         }
2607         runtime_visible_parameter_annotations_length = method_attribute_length;
2608         runtime_visible_parameter_annotations = cfs->get_u1_buffer();
2609         assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations");
2610         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2611       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2612         if (runtime_invisible_parameter_annotations_exists) {
2613           classfile_parse_error(
2614             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2615             CHECK_NULL);
2616         }
2617         runtime_invisible_parameter_annotations_exists = true;
2618         if (PreserveAllAnnotations) {
2619           runtime_invisible_parameter_annotations_length = method_attribute_length;
2620           runtime_invisible_parameter_annotations = cfs->get_u1_buffer();
2621           assert(runtime_invisible_parameter_annotations != NULL,
2622             "null invisible parameter annotations");
2623         }
2624         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2625       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2626         if (annotation_default != NULL) {
2627           classfile_parse_error(
2628             "Multiple AnnotationDefault attributes for method in class file %s",
2629             CHECK_NULL);
2630         }
2631         annotation_default_length = method_attribute_length;
2632         annotation_default = cfs->get_u1_buffer();
2633         assert(annotation_default != NULL, "null annotation default");
2634         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2635       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2636         if (runtime_visible_type_annotations != NULL) {
2637           classfile_parse_error(
2638             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2639             CHECK_NULL);
2640         }
2641         runtime_visible_type_annotations_length = method_attribute_length;
2642         runtime_visible_type_annotations = cfs->get_u1_buffer();
2643         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
2644         // No need for the VM to parse Type annotations
2645         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2646       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2647         if (runtime_invisible_type_annotations_exists) {
2648           classfile_parse_error(
2649             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2650             CHECK_NULL);
2651         } else {
2652           runtime_invisible_type_annotations_exists = true;
2653         }
2654         if (PreserveAllAnnotations) {
2655           runtime_invisible_type_annotations_length = method_attribute_length;
2656           runtime_invisible_type_annotations = cfs->get_u1_buffer();
2657           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
2658         }
2659         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2660       } else {
2661         // Skip unknown attributes
2662         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2663       }
2664     } else {
2665       // Skip unknown attributes
2666       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2667     }
2668   }
2669 
2670   if (linenumber_table != NULL) {
2671     linenumber_table->write_terminator();
2672     linenumber_table_length = linenumber_table->position();
2673   }
2674 
2675   // Make sure there's at least one Code attribute in non-native/non-abstract method
2676   if (_need_verify) {
2677     guarantee_property(access_flags.is_native() ||
2678                        access_flags.is_abstract() ||
2679                        parsed_code_attribute,
2680                        "Absent Code attribute in method that is not native or abstract in class file %s",
2681                        CHECK_NULL);
2682   }
2683 
2684   // All sizing information for a Method* is finally available, now create it
2685   InlineTableSizes sizes(
2686       total_lvt_length,
2687       linenumber_table_length,
2688       exception_table_length,
2689       checked_exceptions_length,
2690       method_parameters_length,
2691       generic_signature_index,
2692       runtime_visible_annotations_length +
2693            runtime_invisible_annotations_length,
2694       runtime_visible_parameter_annotations_length +
2695            runtime_invisible_parameter_annotations_length,
2696       runtime_visible_type_annotations_length +
2697            runtime_invisible_type_annotations_length,
2698       annotation_default_length,
2699       0);
2700 
2701   Method* const m = Method::allocate(_loader_data,
2702                                      code_length,
2703                                      access_flags,
2704                                      &sizes,
2705                                      ConstMethod::NORMAL,
2706                                      CHECK_NULL);
2707 
2708   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2709 
2710   // Fill in information from fixed part (access_flags already set)
2711   m->set_constants(_cp);
2712   m->set_name_index(name_index);
2713   m->set_signature_index(signature_index);
2714 #ifdef CC_INTERP
2715   // hmm is there a gc issue here??
2716   ResultTypeFinder rtf(cp->symbol_at(signature_index));
2717   m->set_result_index(rtf.type());
2718 #endif
2719 
2720   if (args_size >= 0) {
2721     m->set_size_of_parameters(args_size);
2722   } else {
2723     m->compute_size_of_parameters(THREAD);
2724   }
2725 #ifdef ASSERT
2726   if (args_size >= 0) {
2727     m->compute_size_of_parameters(THREAD);
2728     assert(args_size == m->size_of_parameters(), "");
2729   }
2730 #endif
2731 
2732   // Fill in code attribute information
2733   m->set_max_stack(max_stack);
2734   m->set_max_locals(max_locals);
2735   if (stackmap_data != NULL) {
2736     m->constMethod()->copy_stackmap_data(_loader_data,
2737                                          (u1*)stackmap_data,
2738                                          stackmap_data_length,
2739                                          CHECK_NULL);
2740   }
2741 
2742   // Copy byte codes
2743   m->set_code((u1*)code_start);
2744 
2745   // Copy line number table
2746   if (linenumber_table != NULL) {
2747     memcpy(m->compressed_linenumber_table(),
2748            linenumber_table->buffer(),
2749            linenumber_table_length);
2750   }
2751 
2752   // Copy exception table
2753   if (exception_table_length > 0) {
2754     int size =
2755       exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2);
2756     copy_u2_with_conversion((u2*) m->exception_table_start(),
2757                             exception_table_start, size);
2758   }
2759 
2760   // Copy method parameters
2761   if (method_parameters_length > 0) {
2762     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2763     for (int i = 0; i < method_parameters_length; i++) {
2764       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2765       method_parameters_data += 2;
2766       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2767       method_parameters_data += 2;
2768     }
2769   }
2770 
2771   // Copy checked exceptions
2772   if (checked_exceptions_length > 0) {
2773     const int size =
2774       checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2);
2775     copy_u2_with_conversion((u2*) m->checked_exceptions_start(),
2776                             checked_exceptions_start,
2777                             size);
2778   }
2779 
2780   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2781   if (total_lvt_length > 0) {
2782     promoted_flags->set_has_localvariable_table();
2783     copy_localvariable_table(m->constMethod(),
2784                              lvt_cnt,
2785                              localvariable_table_length,
2786                              localvariable_table_start,
2787                              lvtt_cnt,
2788                              localvariable_type_table_length,
2789                              localvariable_type_table_start,
2790                              CHECK_NULL);
2791   }
2792 
2793   if (parsed_annotations.has_any_annotations())
2794     parsed_annotations.apply_to(m);
2795 
2796   // Copy annotations
2797   copy_method_annotations(m->constMethod(),
2798                           runtime_visible_annotations,
2799                           runtime_visible_annotations_length,
2800                           runtime_invisible_annotations,
2801                           runtime_invisible_annotations_length,
2802                           runtime_visible_parameter_annotations,
2803                           runtime_visible_parameter_annotations_length,
2804                           runtime_invisible_parameter_annotations,
2805                           runtime_invisible_parameter_annotations_length,
2806                           runtime_visible_type_annotations,
2807                           runtime_visible_type_annotations_length,
2808                           runtime_invisible_type_annotations,
2809                           runtime_invisible_type_annotations_length,
2810                           annotation_default,
2811                           annotation_default_length,
2812                           CHECK_NULL);
2813 
2814   if (name == vmSymbols::finalize_method_name() &&
2815       signature == vmSymbols::void_method_signature()) {
2816     if (m->is_empty_method()) {
2817       _has_empty_finalizer = true;
2818     } else {
2819       _has_finalizer = true;
2820     }
2821   }
2822   if (name == vmSymbols::object_initializer_name() &&
2823       signature == vmSymbols::void_method_signature() &&
2824       m->is_vanilla_constructor()) {
2825     _has_vanilla_constructor = true;
2826   }
2827 
2828   NOT_PRODUCT(m->verify());
2829   return m;
2830 }
2831 
2832 
2833 // The promoted_flags parameter is used to pass relevant access_flags
2834 // from the methods back up to the containing klass. These flag values
2835 // are added to klass's access_flags.
2836 // Side-effects: populates the _methods field in the parser
2837 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2838                                     bool is_interface,
2839                                     AccessFlags* promoted_flags,
2840                                     bool* has_final_method,
2841                                     bool* declares_default_methods,
2842                                     TRAPS) {
2843   assert(cfs != NULL, "invariant");
2844   assert(promoted_flags != NULL, "invariant");
2845   assert(has_final_method != NULL, "invariant");
2846   assert(declares_default_methods != NULL, "invariant");
2847 
2848   assert(NULL == _methods, "invariant");
2849 
2850   cfs->guarantee_more(2, CHECK);  // length
2851   const u2 length = cfs->get_u2_fast();
2852   if (length == 0) {
2853     _methods = Universe::the_empty_method_array();
2854   } else {
2855     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2856                                                    length,
2857                                                    NULL,
2858                                                    CHECK);
2859 
2860     HandleMark hm(THREAD);
2861     for (int index = 0; index < length; index++) {
2862       Method* method = parse_method(cfs,
2863                                     is_interface,
2864                                     _cp,
2865                                     promoted_flags,
2866                                     CHECK);
2867 
2868       if (method->is_final()) {
2869         *has_final_method = true;
2870       }
2871       // declares_default_methods: declares concrete instance methods, any access flags
2872       // used for interface initialization, and default method inheritance analysis
2873       if (is_interface && !(*declares_default_methods)
2874         && !method->is_abstract() && !method->is_static()) {
2875         *declares_default_methods = true;
2876       }
2877       _methods->at_put(index, method);
2878     }
2879 
2880     if (_need_verify && length > 1) {
2881       // Check duplicated methods
2882       ResourceMark rm(THREAD);
2883       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
2884         THREAD, NameSigHash*, HASH_ROW_SIZE);
2885       initialize_hashtable(names_and_sigs);
2886       bool dup = false;
2887       {
2888         debug_only(NoSafepointVerifier nsv;)
2889         for (int i = 0; i < length; i++) {
2890           const Method* const m = _methods->at(i);
2891           // If no duplicates, add name/signature in hashtable names_and_sigs.
2892           if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) {
2893             dup = true;
2894             break;
2895           }
2896         }
2897       }
2898       if (dup) {
2899         classfile_parse_error("Duplicate method name&signature in class file %s",
2900                               CHECK);
2901       }
2902     }
2903   }
2904 }
2905 
2906 static const intArray* sort_methods(Array<Method*>* methods) {
2907   const int length = methods->length();
2908   // If JVMTI original method ordering or sharing is enabled we have to
2909   // remember the original class file ordering.
2910   // We temporarily use the vtable_index field in the Method* to store the
2911   // class file index, so we can read in after calling qsort.
2912   // Put the method ordering in the shared archive.
2913   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2914     for (int index = 0; index < length; index++) {
2915       Method* const m = methods->at(index);
2916       assert(!m->valid_vtable_index(), "vtable index should not be set");
2917       m->set_vtable_index(index);
2918     }
2919   }
2920   // Sort method array by ascending method name (for faster lookups & vtable construction)
2921   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2922   Method::sort_methods(methods);
2923 
2924   intArray* method_ordering = NULL;
2925   // If JVMTI original method ordering or sharing is enabled construct int
2926   // array remembering the original ordering
2927   if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) {
2928     method_ordering = new intArray(length);
2929     for (int index = 0; index < length; index++) {
2930       Method* const m = methods->at(index);
2931       const int old_index = m->vtable_index();
2932       assert(old_index >= 0 && old_index < length, "invalid method index");
2933       method_ordering->at_put(index, old_index);
2934       m->set_vtable_index(Method::invalid_vtable_index);
2935     }
2936   }
2937   return method_ordering;
2938 }
2939 
2940 // Parse generic_signature attribute for methods and fields
2941 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2942                                                       TRAPS) {
2943   assert(cfs != NULL, "invariant");
2944 
2945   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2946   const u2 generic_signature_index = cfs->get_u2_fast();
2947   check_property(
2948     valid_symbol_at(generic_signature_index),
2949     "Invalid Signature attribute at constant pool index %u in class file %s",
2950     generic_signature_index, CHECK_0);
2951   return generic_signature_index;
2952 }
2953 
2954 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2955                                                            TRAPS) {
2956 
2957   assert(cfs != NULL, "invariant");
2958 
2959   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2960   const u2 sourcefile_index = cfs->get_u2_fast();
2961   check_property(
2962     valid_symbol_at(sourcefile_index),
2963     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2964     sourcefile_index, CHECK);
2965   set_class_sourcefile_index(sourcefile_index);
2966 }
2967 
2968 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2969                                                                        int length,
2970                                                                        TRAPS) {
2971   assert(cfs != NULL, "invariant");
2972 
2973   const u1* const sde_buffer = cfs->get_u1_buffer();
2974   assert(sde_buffer != NULL, "null sde buffer");
2975 
2976   // Don't bother storing it if there is no way to retrieve it
2977   if (JvmtiExport::can_get_source_debug_extension()) {
2978     assert((length+1) > length, "Overflow checking");
2979     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2980     for (int i = 0; i < length; i++) {
2981       sde[i] = sde_buffer[i];
2982     }
2983     sde[length] = '\0';
2984     set_class_sde_buffer((const char*)sde, length);
2985   }
2986   // Got utf8 string, set stream position forward
2987   cfs->skip_u1(length, CHECK);
2988 }
2989 
2990 
2991 // Inner classes can be static, private or protected (classic VM does this)
2992 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2993                                            JVM_ACC_PRIVATE |                \
2994                                            JVM_ACC_PROTECTED |              \
2995                                            JVM_ACC_STATIC                   \
2996                                          )
2997 
2998 // Return number of classes in the inner classes attribute table
2999 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3000                                                             const u1* const inner_classes_attribute_start,
3001                                                             bool parsed_enclosingmethod_attribute,
3002                                                             u2 enclosing_method_class_index,
3003                                                             u2 enclosing_method_method_index,
3004                                                             TRAPS) {
3005   const u1* const current_mark = cfs->current();
3006   u2 length = 0;
3007   if (inner_classes_attribute_start != NULL) {
3008     cfs->set_current(inner_classes_attribute_start);
3009     cfs->guarantee_more(2, CHECK_0);  // length
3010     length = cfs->get_u2_fast();
3011   }
3012 
3013   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3014   // method data:
3015   //   [inner_class_info_index,
3016   //    outer_class_info_index,
3017   //    inner_name_index,
3018   //    inner_class_access_flags,
3019   //    ...
3020   //    enclosing_method_class_index,
3021   //    enclosing_method_method_index]
3022   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3023   Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3024   _inner_classes = inner_classes;
3025 
3026   int index = 0;
3027   const int cp_size = _cp->length();
3028   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
3029   for (int n = 0; n < length; n++) {
3030     // Inner class index
3031     const u2 inner_class_info_index = cfs->get_u2_fast();
3032     check_property(
3033       valid_klass_reference_at(inner_class_info_index),
3034       "inner_class_info_index %u has bad constant type in class file %s",
3035       inner_class_info_index, CHECK_0);
3036     // Outer class index
3037     const u2 outer_class_info_index = cfs->get_u2_fast();
3038     check_property(
3039       outer_class_info_index == 0 ||
3040         valid_klass_reference_at(outer_class_info_index),
3041       "outer_class_info_index %u has bad constant type in class file %s",
3042       outer_class_info_index, CHECK_0);
3043     // Inner class name
3044     const u2 inner_name_index = cfs->get_u2_fast();
3045     check_property(
3046       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3047       "inner_name_index %u has bad constant type in class file %s",
3048       inner_name_index, CHECK_0);
3049     if (_need_verify) {
3050       guarantee_property(inner_class_info_index != outer_class_info_index,
3051                          "Class is both outer and inner class in class file %s", CHECK_0);
3052     }
3053     // Access flags
3054     jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3055     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3056       // Set abstract bit for old class files for backward compatibility
3057       flags |= JVM_ACC_ABSTRACT;
3058     }
3059     verify_legal_class_modifiers(flags, CHECK_0);
3060     AccessFlags inner_access_flags(flags);
3061 
3062     inner_classes->at_put(index++, inner_class_info_index);
3063     inner_classes->at_put(index++, outer_class_info_index);
3064     inner_classes->at_put(index++, inner_name_index);
3065     inner_classes->at_put(index++, inner_access_flags.as_short());
3066   }
3067 
3068   // 4347400: make sure there's no duplicate entry in the classes array
3069   if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3070     for(int i = 0; i < length * 4; i += 4) {
3071       for(int j = i + 4; j < length * 4; j += 4) {
3072         guarantee_property((inner_classes->at(i)   != inner_classes->at(j) ||
3073                             inner_classes->at(i+1) != inner_classes->at(j+1) ||
3074                             inner_classes->at(i+2) != inner_classes->at(j+2) ||
3075                             inner_classes->at(i+3) != inner_classes->at(j+3)),
3076                             "Duplicate entry in InnerClasses in class file %s",
3077                             CHECK_0);
3078       }
3079     }
3080   }
3081 
3082   // Set EnclosingMethod class and method indexes.
3083   if (parsed_enclosingmethod_attribute) {
3084     inner_classes->at_put(index++, enclosing_method_class_index);
3085     inner_classes->at_put(index++, enclosing_method_method_index);
3086   }
3087   assert(index == size, "wrong size");
3088 
3089   // Restore buffer's current position.
3090   cfs->set_current(current_mark);
3091 
3092   return length;
3093 }
3094 
3095 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) {
3096   set_class_synthetic_flag(true);
3097 }
3098 
3099 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3100   assert(cfs != NULL, "invariant");
3101 
3102   const u2 signature_index = cfs->get_u2(CHECK);
3103   check_property(
3104     valid_symbol_at(signature_index),
3105     "Invalid constant pool index %u in Signature attribute in class file %s",
3106     signature_index, CHECK);
3107   set_class_generic_signature_index(signature_index);
3108 }
3109 
3110 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3111                                                                   ConstantPool* cp,
3112                                                                   u4 attribute_byte_length,
3113                                                                   TRAPS) {
3114   assert(cfs != NULL, "invariant");
3115   assert(cp != NULL, "invariant");
3116 
3117   const u1* const current_start = cfs->current();
3118 
3119   guarantee_property(attribute_byte_length >= sizeof(u2),
3120                      "Invalid BootstrapMethods attribute length %u in class file %s",
3121                      attribute_byte_length,
3122                      CHECK);
3123 
3124   cfs->guarantee_more(attribute_byte_length, CHECK);
3125 
3126   const int attribute_array_length = cfs->get_u2_fast();
3127 
3128   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3129                      "Short length on BootstrapMethods in class file %s",
3130                      CHECK);
3131 
3132 
3133   // The attribute contains a counted array of counted tuples of shorts,
3134   // represending bootstrap specifiers:
3135   //    length*{bootstrap_method_index, argument_count*{argument_index}}
3136   const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3137   // operand_count = number of shorts in attr, except for leading length
3138 
3139   // The attribute is copied into a short[] array.
3140   // The array begins with a series of short[2] pairs, one for each tuple.
3141   const int index_size = (attribute_array_length * 2);
3142 
3143   Array<u2>* const operands =
3144     MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3145 
3146   // Eagerly assign operands so they will be deallocated with the constant
3147   // pool if there is an error.
3148   cp->set_operands(operands);
3149 
3150   int operand_fill_index = index_size;
3151   const int cp_size = cp->length();
3152 
3153   for (int n = 0; n < attribute_array_length; n++) {
3154     // Store a 32-bit offset into the header of the operand array.
3155     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3156 
3157     // Read a bootstrap specifier.
3158     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3159     const u2 bootstrap_method_index = cfs->get_u2_fast();
3160     const u2 argument_count = cfs->get_u2_fast();
3161     check_property(
3162       valid_cp_range(bootstrap_method_index, cp_size) &&
3163       cp->tag_at(bootstrap_method_index).is_method_handle(),
3164       "bootstrap_method_index %u has bad constant type in class file %s",
3165       bootstrap_method_index,
3166       CHECK);
3167 
3168     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3169       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3170       CHECK);
3171 
3172     operands->at_put(operand_fill_index++, bootstrap_method_index);
3173     operands->at_put(operand_fill_index++, argument_count);
3174 
3175     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
3176     for (int j = 0; j < argument_count; j++) {
3177       const u2 argument_index = cfs->get_u2_fast();
3178       check_property(
3179         valid_cp_range(argument_index, cp_size) &&
3180         cp->tag_at(argument_index).is_loadable_constant(),
3181         "argument_index %u has bad constant type in class file %s",
3182         argument_index,
3183         CHECK);
3184       operands->at_put(operand_fill_index++, argument_index);
3185     }
3186   }
3187   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3188                      "Bad length on BootstrapMethods in class file %s",
3189                      CHECK);
3190 }
3191 
3192 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3193                                                  ConstantPool* cp,
3194                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3195                                                  TRAPS) {
3196   assert(cfs != NULL, "invariant");
3197   assert(cp != NULL, "invariant");
3198   assert(parsed_annotations != NULL, "invariant");
3199 
3200   // Set inner classes attribute to default sentinel
3201   _inner_classes = Universe::the_empty_short_array();
3202   cfs->guarantee_more(2, CHECK);  // attributes_count
3203   u2 attributes_count = cfs->get_u2_fast();
3204   bool parsed_sourcefile_attribute = false;
3205   bool parsed_innerclasses_attribute = false;
3206   bool parsed_enclosingmethod_attribute = false;
3207   bool parsed_bootstrap_methods_attribute = false;
3208   const u1* runtime_visible_annotations = NULL;
3209   int runtime_visible_annotations_length = 0;
3210   const u1* runtime_invisible_annotations = NULL;
3211   int runtime_invisible_annotations_length = 0;
3212   const u1* runtime_visible_type_annotations = NULL;
3213   int runtime_visible_type_annotations_length = 0;
3214   const u1* runtime_invisible_type_annotations = NULL;
3215   int runtime_invisible_type_annotations_length = 0;
3216   bool runtime_invisible_type_annotations_exists = false;
3217   bool runtime_invisible_annotations_exists = false;
3218   bool parsed_source_debug_ext_annotations_exist = false;
3219   const u1* inner_classes_attribute_start = NULL;
3220   u4  inner_classes_attribute_length = 0;
3221   u2  enclosing_method_class_index = 0;
3222   u2  enclosing_method_method_index = 0;
3223   // Iterate over attributes
3224   while (attributes_count--) {
3225     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3226     const u2 attribute_name_index = cfs->get_u2_fast();
3227     const u4 attribute_length = cfs->get_u4_fast();
3228     check_property(
3229       valid_symbol_at(attribute_name_index),
3230       "Attribute name has bad constant pool index %u in class file %s",
3231       attribute_name_index, CHECK);
3232     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3233     if (tag == vmSymbols::tag_source_file()) {
3234       // Check for SourceFile tag
3235       if (_need_verify) {
3236         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3237       }
3238       if (parsed_sourcefile_attribute) {
3239         classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK);
3240       } else {
3241         parsed_sourcefile_attribute = true;
3242       }
3243       parse_classfile_sourcefile_attribute(cfs, CHECK);
3244     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3245       // Check for SourceDebugExtension tag
3246       if (parsed_source_debug_ext_annotations_exist) {
3247           classfile_parse_error(
3248             "Multiple SourceDebugExtension attributes in class file %s", CHECK);
3249       }
3250       parsed_source_debug_ext_annotations_exist = true;
3251       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3252     } else if (tag == vmSymbols::tag_inner_classes()) {
3253       // Check for InnerClasses tag
3254       if (parsed_innerclasses_attribute) {
3255         classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK);
3256       } else {
3257         parsed_innerclasses_attribute = true;
3258       }
3259       inner_classes_attribute_start = cfs->get_u1_buffer();
3260       inner_classes_attribute_length = attribute_length;
3261       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3262     } else if (tag == vmSymbols::tag_synthetic()) {
3263       // Check for Synthetic tag
3264       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3265       if (attribute_length != 0) {
3266         classfile_parse_error(
3267           "Invalid Synthetic classfile attribute length %u in class file %s",
3268           attribute_length, CHECK);
3269       }
3270       parse_classfile_synthetic_attribute(CHECK);
3271     } else if (tag == vmSymbols::tag_deprecated()) {
3272       // Check for Deprecatd tag - 4276120
3273       if (attribute_length != 0) {
3274         classfile_parse_error(
3275           "Invalid Deprecated classfile attribute length %u in class file %s",
3276           attribute_length, CHECK);
3277       }
3278     } else if (_major_version >= JAVA_1_5_VERSION) {
3279       if (tag == vmSymbols::tag_signature()) {
3280         if (attribute_length != 2) {
3281           classfile_parse_error(
3282             "Wrong Signature attribute length %u in class file %s",
3283             attribute_length, CHECK);
3284         }
3285         parse_classfile_signature_attribute(cfs, CHECK);
3286       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3287         if (runtime_visible_annotations != NULL) {
3288           classfile_parse_error(
3289             "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK);
3290         }
3291         runtime_visible_annotations_length = attribute_length;
3292         runtime_visible_annotations = cfs->get_u1_buffer();
3293         assert(runtime_visible_annotations != NULL, "null visible annotations");
3294         parse_annotations(cp,
3295                           runtime_visible_annotations,
3296                           runtime_visible_annotations_length,
3297                           parsed_annotations,
3298                           _loader_data,
3299                           CHECK);
3300         cfs->skip_u1(runtime_visible_annotations_length, CHECK);
3301       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3302         if (runtime_invisible_annotations_exists) {
3303           classfile_parse_error(
3304             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK);
3305         }
3306         runtime_invisible_annotations_exists = true;
3307         if (PreserveAllAnnotations) {
3308           runtime_invisible_annotations_length = attribute_length;
3309           runtime_invisible_annotations = cfs->get_u1_buffer();
3310           assert(runtime_invisible_annotations != NULL, "null invisible annotations");
3311         }
3312         cfs->skip_u1(attribute_length, CHECK);
3313       } else if (tag == vmSymbols::tag_enclosing_method()) {
3314         if (parsed_enclosingmethod_attribute) {
3315           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK);
3316         } else {
3317           parsed_enclosingmethod_attribute = true;
3318         }
3319         guarantee_property(attribute_length == 4,
3320           "Wrong EnclosingMethod attribute length %u in class file %s",
3321           attribute_length, CHECK);
3322         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3323         enclosing_method_class_index  = cfs->get_u2_fast();
3324         enclosing_method_method_index = cfs->get_u2_fast();
3325         if (enclosing_method_class_index == 0) {
3326           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK);
3327         }
3328         // Validate the constant pool indices and types
3329         check_property(valid_klass_reference_at(enclosing_method_class_index),
3330           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3331         if (enclosing_method_method_index != 0 &&
3332             (!cp->is_within_bounds(enclosing_method_method_index) ||
3333              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3334           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK);
3335         }
3336       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3337                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3338         if (parsed_bootstrap_methods_attribute)
3339           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK);
3340         parsed_bootstrap_methods_attribute = true;
3341         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3342       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3343         if (runtime_visible_type_annotations != NULL) {
3344           classfile_parse_error(
3345             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK);
3346         }
3347         runtime_visible_type_annotations_length = attribute_length;
3348         runtime_visible_type_annotations = cfs->get_u1_buffer();
3349         assert(runtime_visible_type_annotations != NULL, "null visible type annotations");
3350         // No need for the VM to parse Type annotations
3351         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3352       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3353         if (runtime_invisible_type_annotations_exists) {
3354           classfile_parse_error(
3355             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK);
3356         } else {
3357           runtime_invisible_type_annotations_exists = true;
3358         }
3359         if (PreserveAllAnnotations) {
3360           runtime_invisible_type_annotations_length = attribute_length;
3361           runtime_invisible_type_annotations = cfs->get_u1_buffer();
3362           assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations");
3363         }
3364         cfs->skip_u1(attribute_length, CHECK);
3365       } else {
3366         // Unknown attribute
3367         cfs->skip_u1(attribute_length, CHECK);
3368       }
3369     } else {
3370       // Unknown attribute
3371       cfs->skip_u1(attribute_length, CHECK);
3372     }
3373   }
3374   _annotations = assemble_annotations(runtime_visible_annotations,
3375                                       runtime_visible_annotations_length,
3376                                       runtime_invisible_annotations,
3377                                       runtime_invisible_annotations_length,
3378                                       CHECK);
3379   _type_annotations = assemble_annotations(runtime_visible_type_annotations,
3380                                            runtime_visible_type_annotations_length,
3381                                            runtime_invisible_type_annotations,
3382                                            runtime_invisible_type_annotations_length,
3383                                            CHECK);
3384 
3385   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3386     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3387                             cfs,
3388                             inner_classes_attribute_start,
3389                             parsed_innerclasses_attribute,
3390                             enclosing_method_class_index,
3391                             enclosing_method_method_index,
3392                             CHECK);
3393     if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) {
3394       guarantee_property(
3395         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3396         "Wrong InnerClasses attribute length in class file %s", CHECK);
3397     }
3398   }
3399 
3400   if (_max_bootstrap_specifier_index >= 0) {
3401     guarantee_property(parsed_bootstrap_methods_attribute,
3402                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3403   }
3404 }
3405 
3406 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3407   assert(k != NULL, "invariant");
3408 
3409   if (_synthetic_flag)
3410     k->set_is_synthetic();
3411   if (_sourcefile_index != 0) {
3412     k->set_source_file_name_index(_sourcefile_index);
3413   }
3414   if (_generic_signature_index != 0) {
3415     k->set_generic_signature_index(_generic_signature_index);
3416   }
3417   if (_sde_buffer != NULL) {
3418     k->set_source_debug_extension(_sde_buffer, _sde_length);
3419   }
3420 }
3421 
3422 // Create the Annotations object that will
3423 // hold the annotations array for the Klass.
3424 void ClassFileParser::create_combined_annotations(TRAPS) {
3425     if (_annotations == NULL &&
3426         _type_annotations == NULL &&
3427         _fields_annotations == NULL &&
3428         _fields_type_annotations == NULL) {
3429       // Don't create the Annotations object unnecessarily.
3430       return;
3431     }
3432 
3433     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3434     annotations->set_class_annotations(_annotations);
3435     annotations->set_class_type_annotations(_type_annotations);
3436     annotations->set_fields_annotations(_fields_annotations);
3437     annotations->set_fields_type_annotations(_fields_type_annotations);
3438 
3439     // This is the Annotations object that will be
3440     // assigned to InstanceKlass being constructed.
3441     _combined_annotations = annotations;
3442 
3443     // The annotations arrays below has been transfered the
3444     // _combined_annotations so these fields can now be cleared.
3445     _annotations             = NULL;
3446     _type_annotations        = NULL;
3447     _fields_annotations      = NULL;
3448     _fields_type_annotations = NULL;
3449 }
3450 
3451 // Transfer ownership of metadata allocated to the InstanceKlass.
3452 void ClassFileParser::apply_parsed_class_metadata(
3453                                             InstanceKlass* this_klass,
3454                                             int java_fields_count, TRAPS) {
3455   assert(this_klass != NULL, "invariant");
3456 
3457   _cp->set_pool_holder(this_klass);
3458   this_klass->set_constants(_cp);
3459   this_klass->set_fields(_fields, java_fields_count);
3460   this_klass->set_methods(_methods);
3461   this_klass->set_inner_classes(_inner_classes);
3462   this_klass->set_local_interfaces(_local_interfaces);
3463   this_klass->set_transitive_interfaces(_transitive_interfaces);
3464   this_klass->set_annotations(_combined_annotations);
3465 
3466   // Clear out these fields so they don't get deallocated by the destructor
3467   clear_class_metadata();
3468 }
3469 
3470 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3471                                                        int runtime_visible_annotations_length,
3472                                                        const u1* const runtime_invisible_annotations,
3473                                                        int runtime_invisible_annotations_length,
3474                                                        TRAPS) {
3475   AnnotationArray* annotations = NULL;
3476   if (runtime_visible_annotations != NULL ||
3477       runtime_invisible_annotations != NULL) {
3478     annotations = MetadataFactory::new_array<u1>(_loader_data,
3479                                           runtime_visible_annotations_length +
3480                                           runtime_invisible_annotations_length,
3481                                           CHECK_(annotations));
3482     if (runtime_visible_annotations != NULL) {
3483       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3484         annotations->at_put(i, runtime_visible_annotations[i]);
3485       }
3486     }
3487     if (runtime_invisible_annotations != NULL) {
3488       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3489         int append = runtime_visible_annotations_length+i;
3490         annotations->at_put(append, runtime_invisible_annotations[i]);
3491       }
3492     }
3493   }
3494   return annotations;
3495 }
3496 
3497 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3498                                                         const int super_class_index,
3499                                                         const bool need_verify,
3500                                                         TRAPS) {
3501   assert(cp != NULL, "invariant");
3502   const InstanceKlass* super_klass = NULL;
3503 
3504   if (super_class_index == 0) {
3505     check_property(_class_name == vmSymbols::java_lang_Object(),
3506                    "Invalid superclass index %u in class file %s",
3507                    super_class_index,
3508                    CHECK_NULL);
3509   } else {
3510     check_property(valid_klass_reference_at(super_class_index),
3511                    "Invalid superclass index %u in class file %s",
3512                    super_class_index,
3513                    CHECK_NULL);
3514     // The class name should be legal because it is checked when parsing constant pool.
3515     // However, make sure it is not an array type.
3516     bool is_array = false;
3517     if (cp->tag_at(super_class_index).is_klass()) {
3518       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3519       if (need_verify)
3520         is_array = super_klass->is_array_klass();
3521     } else if (need_verify) {
3522       is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY);
3523     }
3524     if (need_verify) {
3525       guarantee_property(!is_array,
3526                         "Bad superclass name in class file %s", CHECK_NULL);
3527     }
3528   }
3529   return super_klass;
3530 }
3531 
3532 static unsigned int compute_oop_map_count(const InstanceKlass* super,
3533                                           unsigned int nonstatic_oop_map_count,
3534                                           int first_nonstatic_oop_offset) {
3535 
3536   unsigned int map_count =
3537     NULL == super ? 0 : super->nonstatic_oop_map_count();
3538   if (nonstatic_oop_map_count > 0) {
3539     // We have oops to add to map
3540     if (map_count == 0) {
3541       map_count = nonstatic_oop_map_count;
3542     }
3543     else {
3544       // Check whether we should add a new map block or whether the last one can
3545       // be extended
3546       const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps();
3547       const OopMapBlock* const last_map = first_map + map_count - 1;
3548 
3549       const int next_offset = last_map->offset() + last_map->count() * heapOopSize;
3550       if (next_offset == first_nonstatic_oop_offset) {
3551         // There is no gap bettwen superklass's last oop field and first
3552         // local oop field, merge maps.
3553         nonstatic_oop_map_count -= 1;
3554       }
3555       else {
3556         // Superklass didn't end with a oop field, add extra maps
3557         assert(next_offset < first_nonstatic_oop_offset, "just checking");
3558       }
3559       map_count += nonstatic_oop_map_count;
3560     }
3561   }
3562   return map_count;
3563 }
3564 
3565 #ifndef PRODUCT
3566 static void print_field_layout(const Symbol* name,
3567                                Array<u2>* fields,
3568                                constantPoolHandle cp,
3569                                int instance_size,
3570                                int instance_fields_start,
3571                                int instance_fields_end,
3572                                int static_fields_end) {
3573 
3574   assert(name != NULL, "invariant");
3575 
3576   tty->print("%s: field layout\n", name->as_klass_external_name());
3577   tty->print("  @%3d %s\n", instance_fields_start, "--- instance fields start ---");
3578   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3579     if (!fs.access_flags().is_static()) {
3580       tty->print("  @%3d \"%s\" %s\n",
3581         fs.offset(),
3582         fs.name()->as_klass_external_name(),
3583         fs.signature()->as_klass_external_name());
3584     }
3585   }
3586   tty->print("  @%3d %s\n", instance_fields_end, "--- instance fields end ---");
3587   tty->print("  @%3d %s\n", instance_size * wordSize, "--- instance ends ---");
3588   tty->print("  @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---");
3589   for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) {
3590     if (fs.access_flags().is_static()) {
3591       tty->print("  @%3d \"%s\" %s\n",
3592         fs.offset(),
3593         fs.name()->as_klass_external_name(),
3594         fs.signature()->as_klass_external_name());
3595     }
3596   }
3597   tty->print("  @%3d %s\n", static_fields_end, "--- static fields end ---");
3598   tty->print("\n");
3599 }
3600 #endif
3601 
3602 // Values needed for oopmap and InstanceKlass creation
3603 class ClassFileParser::FieldLayoutInfo : public ResourceObj {
3604  public:
3605   int*          nonstatic_oop_offsets;
3606   unsigned int* nonstatic_oop_counts;
3607   unsigned int  nonstatic_oop_map_count;
3608   unsigned int  total_oop_map_count;
3609   int           instance_size;
3610   int           nonstatic_field_size;
3611   int           static_field_size;
3612   bool          has_nonstatic_fields;
3613 };
3614 
3615 // Layout fields and fill in FieldLayoutInfo.  Could use more refactoring!
3616 void ClassFileParser::layout_fields(ConstantPool* cp,
3617                                     const FieldAllocationCount* fac,
3618                                     const ClassAnnotationCollector* parsed_annotations,
3619                                     FieldLayoutInfo* info,
3620                                     TRAPS) {
3621 
3622   assert(cp != NULL, "invariant");
3623 
3624   // Field size and offset computation
3625   int nonstatic_field_size = _super_klass == NULL ? 0 :
3626                                _super_klass->nonstatic_field_size();
3627 
3628   // Count the contended fields by type.
3629   //
3630   // We ignore static fields, because @Contended is not supported for them.
3631   // The layout code below will also ignore the static fields.
3632   int nonstatic_contended_count = 0;
3633   FieldAllocationCount fac_contended;
3634   for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3635     FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3636     if (fs.is_contended()) {
3637       fac_contended.count[atype]++;
3638       if (!fs.access_flags().is_static()) {
3639         nonstatic_contended_count++;
3640       }
3641     }
3642   }
3643 
3644 
3645   // Calculate the starting byte offsets
3646   int next_static_oop_offset    = InstanceMirrorKlass::offset_of_static_fields();
3647   int next_static_double_offset = next_static_oop_offset +
3648                                       ((fac->count[STATIC_OOP]) * heapOopSize);
3649   if ( fac->count[STATIC_DOUBLE] &&
3650        (Universe::field_type_should_be_aligned(T_DOUBLE) ||
3651         Universe::field_type_should_be_aligned(T_LONG)) ) {
3652     next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong);
3653   }
3654 
3655   int next_static_word_offset   = next_static_double_offset +
3656                                     ((fac->count[STATIC_DOUBLE]) * BytesPerLong);
3657   int next_static_short_offset  = next_static_word_offset +
3658                                     ((fac->count[STATIC_WORD]) * BytesPerInt);
3659   int next_static_byte_offset   = next_static_short_offset +
3660                                   ((fac->count[STATIC_SHORT]) * BytesPerShort);
3661 
3662   int nonstatic_fields_start  = instanceOopDesc::base_offset_in_bytes() +
3663                                 nonstatic_field_size * heapOopSize;
3664 
3665   int next_nonstatic_field_offset = nonstatic_fields_start;
3666 
3667   const bool is_contended_class     = parsed_annotations->is_contended();
3668 
3669   // Class is contended, pad before all the fields
3670   if (is_contended_class) {
3671     next_nonstatic_field_offset += ContendedPaddingWidth;
3672   }
3673 
3674   // Compute the non-contended fields count.
3675   // The packing code below relies on these counts to determine if some field
3676   // can be squeezed into the alignment gap. Contended fields are obviously
3677   // exempt from that.
3678   unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE];
3679   unsigned int nonstatic_word_count   = fac->count[NONSTATIC_WORD]   - fac_contended.count[NONSTATIC_WORD];
3680   unsigned int nonstatic_short_count  = fac->count[NONSTATIC_SHORT]  - fac_contended.count[NONSTATIC_SHORT];
3681   unsigned int nonstatic_byte_count   = fac->count[NONSTATIC_BYTE]   - fac_contended.count[NONSTATIC_BYTE];
3682   unsigned int nonstatic_oop_count    = fac->count[NONSTATIC_OOP]    - fac_contended.count[NONSTATIC_OOP];
3683 
3684   // Total non-static fields count, including every contended field
3685   unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] +
3686                                         fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] +
3687                                         fac->count[NONSTATIC_OOP];
3688 
3689   const bool super_has_nonstatic_fields =
3690           (_super_klass != NULL && _super_klass->has_nonstatic_fields());
3691   const bool has_nonstatic_fields =
3692     super_has_nonstatic_fields || (nonstatic_fields_count != 0);
3693 
3694 
3695   // Prepare list of oops for oop map generation.
3696   //
3697   // "offset" and "count" lists are describing the set of contiguous oop
3698   // regions. offset[i] is the start of the i-th region, which then has
3699   // count[i] oops following. Before we know how many regions are required,
3700   // we pessimistically allocate the maps to fit all the oops into the
3701   // distinct regions.
3702   //
3703   // TODO: We add +1 to always allocate non-zero resource arrays; we need
3704   // to figure out if we still need to do this.
3705   unsigned int nonstatic_oop_map_count = 0;
3706   unsigned int max_nonstatic_oop_maps  = fac->count[NONSTATIC_OOP] + 1;
3707 
3708   int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD(
3709             THREAD, int, max_nonstatic_oop_maps);
3710   unsigned int* const nonstatic_oop_counts  = NEW_RESOURCE_ARRAY_IN_THREAD(
3711             THREAD, unsigned int, max_nonstatic_oop_maps);
3712 
3713   int first_nonstatic_oop_offset = 0; // will be set for first oop field
3714 
3715   bool compact_fields   = CompactFields;
3716   int allocation_style = FieldsAllocationStyle;
3717   if( allocation_style < 0 || allocation_style > 2 ) { // Out of range?
3718     assert(false, "0 <= FieldsAllocationStyle <= 2");
3719     allocation_style = 1; // Optimistic
3720   }
3721 
3722   // The next classes have predefined hard-coded fields offsets
3723   // (see in JavaClasses::compute_hard_coded_offsets()).
3724   // Use default fields allocation order for them.
3725   if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL &&
3726       (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() ||
3727        _class_name == vmSymbols::java_lang_Class() ||
3728        _class_name == vmSymbols::java_lang_ClassLoader() ||
3729        _class_name == vmSymbols::java_lang_ref_Reference() ||
3730        _class_name == vmSymbols::java_lang_ref_SoftReference() ||
3731        _class_name == vmSymbols::java_lang_StackTraceElement() ||
3732        _class_name == vmSymbols::java_lang_String() ||
3733        _class_name == vmSymbols::java_lang_Throwable() ||
3734        _class_name == vmSymbols::java_lang_Boolean() ||
3735        _class_name == vmSymbols::java_lang_Character() ||
3736        _class_name == vmSymbols::java_lang_Float() ||
3737        _class_name == vmSymbols::java_lang_Double() ||
3738        _class_name == vmSymbols::java_lang_Byte() ||
3739        _class_name == vmSymbols::java_lang_Short() ||
3740        _class_name == vmSymbols::java_lang_Integer() ||
3741        _class_name == vmSymbols::java_lang_Long())) {
3742     allocation_style = 0;     // Allocate oops first
3743     compact_fields   = false; // Don't compact fields
3744   }
3745 
3746   int next_nonstatic_oop_offset = 0;
3747   int next_nonstatic_double_offset = 0;
3748 
3749   // Rearrange fields for a given allocation style
3750   if( allocation_style == 0 ) {
3751     // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields
3752     next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3753     next_nonstatic_double_offset = next_nonstatic_oop_offset +
3754                                     (nonstatic_oop_count * heapOopSize);
3755   } else if( allocation_style == 1 ) {
3756     // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields
3757     next_nonstatic_double_offset = next_nonstatic_field_offset;
3758   } else if( allocation_style == 2 ) {
3759     // Fields allocation: oops fields in super and sub classes are together.
3760     if( nonstatic_field_size > 0 && _super_klass != NULL &&
3761         _super_klass->nonstatic_oop_map_size() > 0 ) {
3762       const unsigned int map_count = _super_klass->nonstatic_oop_map_count();
3763       const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps();
3764       const OopMapBlock* const last_map = first_map + map_count - 1;
3765       const int next_offset = last_map->offset() + (last_map->count() * heapOopSize);
3766       if (next_offset == next_nonstatic_field_offset) {
3767         allocation_style = 0;   // allocate oops first
3768         next_nonstatic_oop_offset    = next_nonstatic_field_offset;
3769         next_nonstatic_double_offset = next_nonstatic_oop_offset +
3770                                        (nonstatic_oop_count * heapOopSize);
3771       }
3772     }
3773     if( allocation_style == 2 ) {
3774       allocation_style = 1;     // allocate oops last
3775       next_nonstatic_double_offset = next_nonstatic_field_offset;
3776     }
3777   } else {
3778     ShouldNotReachHere();
3779   }
3780 
3781   int nonstatic_oop_space_count   = 0;
3782   int nonstatic_word_space_count  = 0;
3783   int nonstatic_short_space_count = 0;
3784   int nonstatic_byte_space_count  = 0;
3785   int nonstatic_oop_space_offset = 0;
3786   int nonstatic_word_space_offset = 0;
3787   int nonstatic_short_space_offset = 0;
3788   int nonstatic_byte_space_offset = 0;
3789 
3790   // Try to squeeze some of the fields into the gaps due to
3791   // long/double alignment.
3792   if (nonstatic_double_count > 0) {
3793     int offset = next_nonstatic_double_offset;
3794     next_nonstatic_double_offset = align_size_up(offset, BytesPerLong);
3795     if (compact_fields && offset != next_nonstatic_double_offset) {
3796       // Allocate available fields into the gap before double field.
3797       int length = next_nonstatic_double_offset - offset;
3798       assert(length == BytesPerInt, "");
3799       nonstatic_word_space_offset = offset;
3800       if (nonstatic_word_count > 0) {
3801         nonstatic_word_count      -= 1;
3802         nonstatic_word_space_count = 1; // Only one will fit
3803         length -= BytesPerInt;
3804         offset += BytesPerInt;
3805       }
3806       nonstatic_short_space_offset = offset;
3807       while (length >= BytesPerShort && nonstatic_short_count > 0) {
3808         nonstatic_short_count       -= 1;
3809         nonstatic_short_space_count += 1;
3810         length -= BytesPerShort;
3811         offset += BytesPerShort;
3812       }
3813       nonstatic_byte_space_offset = offset;
3814       while (length > 0 && nonstatic_byte_count > 0) {
3815         nonstatic_byte_count       -= 1;
3816         nonstatic_byte_space_count += 1;
3817         length -= 1;
3818       }
3819       // Allocate oop field in the gap if there are no other fields for that.
3820       nonstatic_oop_space_offset = offset;
3821       if (length >= heapOopSize && nonstatic_oop_count > 0 &&
3822           allocation_style != 0) { // when oop fields not first
3823         nonstatic_oop_count      -= 1;
3824         nonstatic_oop_space_count = 1; // Only one will fit
3825         length -= heapOopSize;
3826         offset += heapOopSize;
3827       }
3828     }
3829   }
3830 
3831   int next_nonstatic_word_offset = next_nonstatic_double_offset +
3832                                      (nonstatic_double_count * BytesPerLong);
3833   int next_nonstatic_short_offset = next_nonstatic_word_offset +
3834                                       (nonstatic_word_count * BytesPerInt);
3835   int next_nonstatic_byte_offset = next_nonstatic_short_offset +
3836                                      (nonstatic_short_count * BytesPerShort);
3837   int next_nonstatic_padded_offset = next_nonstatic_byte_offset +
3838                                        nonstatic_byte_count;
3839 
3840   // let oops jump before padding with this allocation style
3841   if( allocation_style == 1 ) {
3842     next_nonstatic_oop_offset = next_nonstatic_padded_offset;
3843     if( nonstatic_oop_count > 0 ) {
3844       next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize);
3845     }
3846     next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize);
3847   }
3848 
3849   // Iterate over fields again and compute correct offsets.
3850   // The field allocation type was temporarily stored in the offset slot.
3851   // oop fields are located before non-oop fields (static and non-static).
3852   for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3853 
3854     // skip already laid out fields
3855     if (fs.is_offset_set()) continue;
3856 
3857     // contended instance fields are handled below
3858     if (fs.is_contended() && !fs.access_flags().is_static()) continue;
3859 
3860     int real_offset = 0;
3861     const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type();
3862 
3863     // pack the rest of the fields
3864     switch (atype) {
3865       case STATIC_OOP:
3866         real_offset = next_static_oop_offset;
3867         next_static_oop_offset += heapOopSize;
3868         break;
3869       case STATIC_BYTE:
3870         real_offset = next_static_byte_offset;
3871         next_static_byte_offset += 1;
3872         break;
3873       case STATIC_SHORT:
3874         real_offset = next_static_short_offset;
3875         next_static_short_offset += BytesPerShort;
3876         break;
3877       case STATIC_WORD:
3878         real_offset = next_static_word_offset;
3879         next_static_word_offset += BytesPerInt;
3880         break;
3881       case STATIC_DOUBLE:
3882         real_offset = next_static_double_offset;
3883         next_static_double_offset += BytesPerLong;
3884         break;
3885       case NONSTATIC_OOP:
3886         if( nonstatic_oop_space_count > 0 ) {
3887           real_offset = nonstatic_oop_space_offset;
3888           nonstatic_oop_space_offset += heapOopSize;
3889           nonstatic_oop_space_count  -= 1;
3890         } else {
3891           real_offset = next_nonstatic_oop_offset;
3892           next_nonstatic_oop_offset += heapOopSize;
3893         }
3894 
3895         // Record this oop in the oop maps
3896         if( nonstatic_oop_map_count > 0 &&
3897             nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
3898             real_offset -
3899             int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
3900             heapOopSize ) {
3901           // This oop is adjacent to the previous one, add to current oop map
3902           assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
3903           nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
3904         } else {
3905           // This oop is not adjacent to the previous one, create new oop map
3906           assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
3907           nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
3908           nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
3909           nonstatic_oop_map_count += 1;
3910           if( first_nonstatic_oop_offset == 0 ) { // Undefined
3911             first_nonstatic_oop_offset = real_offset;
3912           }
3913         }
3914         break;
3915       case NONSTATIC_BYTE:
3916         if( nonstatic_byte_space_count > 0 ) {
3917           real_offset = nonstatic_byte_space_offset;
3918           nonstatic_byte_space_offset += 1;
3919           nonstatic_byte_space_count  -= 1;
3920         } else {
3921           real_offset = next_nonstatic_byte_offset;
3922           next_nonstatic_byte_offset += 1;
3923         }
3924         break;
3925       case NONSTATIC_SHORT:
3926         if( nonstatic_short_space_count > 0 ) {
3927           real_offset = nonstatic_short_space_offset;
3928           nonstatic_short_space_offset += BytesPerShort;
3929           nonstatic_short_space_count  -= 1;
3930         } else {
3931           real_offset = next_nonstatic_short_offset;
3932           next_nonstatic_short_offset += BytesPerShort;
3933         }
3934         break;
3935       case NONSTATIC_WORD:
3936         if( nonstatic_word_space_count > 0 ) {
3937           real_offset = nonstatic_word_space_offset;
3938           nonstatic_word_space_offset += BytesPerInt;
3939           nonstatic_word_space_count  -= 1;
3940         } else {
3941           real_offset = next_nonstatic_word_offset;
3942           next_nonstatic_word_offset += BytesPerInt;
3943         }
3944         break;
3945       case NONSTATIC_DOUBLE:
3946         real_offset = next_nonstatic_double_offset;
3947         next_nonstatic_double_offset += BytesPerLong;
3948         break;
3949       default:
3950         ShouldNotReachHere();
3951     }
3952     fs.set_offset(real_offset);
3953   }
3954 
3955 
3956   // Handle the contended cases.
3957   //
3958   // Each contended field should not intersect the cache line with another contended field.
3959   // In the absence of alignment information, we end up with pessimistically separating
3960   // the fields with full-width padding.
3961   //
3962   // Additionally, this should not break alignment for the fields, so we round the alignment up
3963   // for each field.
3964   if (nonstatic_contended_count > 0) {
3965 
3966     // if there is at least one contended field, we need to have pre-padding for them
3967     next_nonstatic_padded_offset += ContendedPaddingWidth;
3968 
3969     // collect all contended groups
3970     BitMap bm(cp->size());
3971     for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3972       // skip already laid out fields
3973       if (fs.is_offset_set()) continue;
3974 
3975       if (fs.is_contended()) {
3976         bm.set_bit(fs.contended_group());
3977       }
3978     }
3979 
3980     int current_group = -1;
3981     while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) {
3982 
3983       for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
3984 
3985         // skip already laid out fields
3986         if (fs.is_offset_set()) continue;
3987 
3988         // skip non-contended fields and fields from different group
3989         if (!fs.is_contended() || (fs.contended_group() != current_group)) continue;
3990 
3991         // handle statics below
3992         if (fs.access_flags().is_static()) continue;
3993 
3994         int real_offset = 0;
3995         FieldAllocationType atype = (FieldAllocationType) fs.allocation_type();
3996 
3997         switch (atype) {
3998           case NONSTATIC_BYTE:
3999             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1);
4000             real_offset = next_nonstatic_padded_offset;
4001             next_nonstatic_padded_offset += 1;
4002             break;
4003 
4004           case NONSTATIC_SHORT:
4005             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort);
4006             real_offset = next_nonstatic_padded_offset;
4007             next_nonstatic_padded_offset += BytesPerShort;
4008             break;
4009 
4010           case NONSTATIC_WORD:
4011             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt);
4012             real_offset = next_nonstatic_padded_offset;
4013             next_nonstatic_padded_offset += BytesPerInt;
4014             break;
4015 
4016           case NONSTATIC_DOUBLE:
4017             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong);
4018             real_offset = next_nonstatic_padded_offset;
4019             next_nonstatic_padded_offset += BytesPerLong;
4020             break;
4021 
4022           case NONSTATIC_OOP:
4023             next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize);
4024             real_offset = next_nonstatic_padded_offset;
4025             next_nonstatic_padded_offset += heapOopSize;
4026 
4027             // Record this oop in the oop maps
4028             if( nonstatic_oop_map_count > 0 &&
4029                 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] ==
4030                 real_offset -
4031                 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) *
4032                 heapOopSize ) {
4033               // This oop is adjacent to the previous one, add to current oop map
4034               assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check");
4035               nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1;
4036             } else {
4037               // This oop is not adjacent to the previous one, create new oop map
4038               assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check");
4039               nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset;
4040               nonstatic_oop_counts [nonstatic_oop_map_count] = 1;
4041               nonstatic_oop_map_count += 1;
4042               if( first_nonstatic_oop_offset == 0 ) { // Undefined
4043                 first_nonstatic_oop_offset = real_offset;
4044               }
4045             }
4046             break;
4047 
4048           default:
4049             ShouldNotReachHere();
4050         }
4051 
4052         if (fs.contended_group() == 0) {
4053           // Contended group defines the equivalence class over the fields:
4054           // the fields within the same contended group are not inter-padded.
4055           // The only exception is default group, which does not incur the
4056           // equivalence, and so requires intra-padding.
4057           next_nonstatic_padded_offset += ContendedPaddingWidth;
4058         }
4059 
4060         fs.set_offset(real_offset);
4061       } // for
4062 
4063       // Start laying out the next group.
4064       // Note that this will effectively pad the last group in the back;
4065       // this is expected to alleviate memory contention effects for
4066       // subclass fields and/or adjacent object.
4067       // If this was the default group, the padding is already in place.
4068       if (current_group != 0) {
4069         next_nonstatic_padded_offset += ContendedPaddingWidth;
4070       }
4071     }
4072 
4073     // handle static fields
4074   }
4075 
4076   // Entire class is contended, pad in the back.
4077   // This helps to alleviate memory contention effects for subclass fields
4078   // and/or adjacent object.
4079   if (is_contended_class) {
4080     next_nonstatic_padded_offset += ContendedPaddingWidth;
4081   }
4082 
4083   int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset;
4084 
4085   int nonstatic_fields_end      = align_size_up(notaligned_nonstatic_fields_end, heapOopSize);
4086   int instance_end              = align_size_up(notaligned_nonstatic_fields_end, wordSize);
4087   int static_fields_end         = align_size_up(next_static_byte_offset, wordSize);
4088 
4089   int static_field_size         = (static_fields_end -
4090                                    InstanceMirrorKlass::offset_of_static_fields()) / wordSize;
4091   nonstatic_field_size          = nonstatic_field_size +
4092                                   (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize;
4093 
4094   int instance_size             = align_object_size(instance_end / wordSize);
4095 
4096   assert(instance_size == align_object_size(align_size_up(
4097          (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize),
4098           wordSize) / wordSize), "consistent layout helper value");
4099 
4100   // Invariant: nonstatic_field end/start should only change if there are
4101   // nonstatic fields in the class, or if the class is contended. We compare
4102   // against the non-aligned value, so that end alignment will not fail the
4103   // assert without actually having the fields.
4104   assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) ||
4105          is_contended_class ||
4106          (nonstatic_fields_count > 0), "double-check nonstatic start/end");
4107 
4108   // Number of non-static oop map blocks allocated at end of klass.
4109   const unsigned int total_oop_map_count =
4110     compute_oop_map_count(_super_klass, nonstatic_oop_map_count,
4111                           first_nonstatic_oop_offset);
4112 
4113 #ifndef PRODUCT
4114   if (PrintFieldLayout) {
4115     print_field_layout(_class_name,
4116           _fields,
4117           cp,
4118           instance_size,
4119           nonstatic_fields_start,
4120           nonstatic_fields_end,
4121           static_fields_end);
4122   }
4123 
4124 #endif
4125   // Pass back information needed for InstanceKlass creation
4126   info->nonstatic_oop_offsets = nonstatic_oop_offsets;
4127   info->nonstatic_oop_counts = nonstatic_oop_counts;
4128   info->nonstatic_oop_map_count = nonstatic_oop_map_count;
4129   info->total_oop_map_count = total_oop_map_count;
4130   info->instance_size = instance_size;
4131   info->static_field_size = static_field_size;
4132   info->nonstatic_field_size = nonstatic_field_size;
4133   info->has_nonstatic_fields = has_nonstatic_fields;
4134 }
4135 
4136 static void fill_oop_maps(const InstanceKlass* k,
4137                           unsigned int nonstatic_oop_map_count,
4138                           const int* nonstatic_oop_offsets,
4139                           const unsigned int* nonstatic_oop_counts) {
4140 
4141   assert(k != NULL, "invariant");
4142 
4143   OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps();
4144   const InstanceKlass* const super = k->superklass();
4145   const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0;
4146   if (super_count > 0) {
4147     // Copy maps from superklass
4148     OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps();
4149     for (unsigned int i = 0; i < super_count; ++i) {
4150       *this_oop_map++ = *super_oop_map++;
4151     }
4152   }
4153 
4154   if (nonstatic_oop_map_count > 0) {
4155     if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) {
4156       // The counts differ because there is no gap between superklass's last oop
4157       // field and the first local oop field.  Extend the last oop map copied
4158       // from the superklass instead of creating new one.
4159       nonstatic_oop_map_count--;
4160       nonstatic_oop_offsets++;
4161       this_oop_map--;
4162       this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++);
4163       this_oop_map++;
4164     }
4165 
4166     // Add new map blocks, fill them
4167     while (nonstatic_oop_map_count-- > 0) {
4168       this_oop_map->set_offset(*nonstatic_oop_offsets++);
4169       this_oop_map->set_count(*nonstatic_oop_counts++);
4170       this_oop_map++;
4171     }
4172     assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() ==
4173            this_oop_map, "sanity");
4174   }
4175 }
4176 
4177 
4178 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4179   assert(ik != NULL, "invariant");
4180 
4181   const Klass* const super = ik->super();
4182 
4183   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4184   // in which case we don't have to register objects as finalizable
4185   if (!_has_empty_finalizer) {
4186     if (_has_finalizer ||
4187         (super != NULL && super->has_finalizer())) {
4188       ik->set_has_finalizer();
4189     }
4190   }
4191 
4192 #ifdef ASSERT
4193   bool f = false;
4194   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4195                                            vmSymbols::void_method_signature());
4196   if (m != NULL && !m->is_empty_method()) {
4197       f = true;
4198   }
4199 
4200   // Spec doesn't prevent agent from redefinition of empty finalizer.
4201   // Despite the fact that it's generally bad idea and redefined finalizer
4202   // will not work as expected we shouldn't abort vm in this case
4203   if (!ik->has_redefined_this_or_super()) {
4204     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4205   }
4206 #endif
4207 
4208   // Check if this klass supports the java.lang.Cloneable interface
4209   if (SystemDictionary::Cloneable_klass_loaded()) {
4210     if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) {
4211       ik->set_is_cloneable();
4212     }
4213   }
4214 
4215   // Check if this klass has a vanilla default constructor
4216   if (super == NULL) {
4217     // java.lang.Object has empty default constructor
4218     ik->set_has_vanilla_constructor();
4219   } else {
4220     if (super->has_vanilla_constructor() &&
4221         _has_vanilla_constructor) {
4222       ik->set_has_vanilla_constructor();
4223     }
4224 #ifdef ASSERT
4225     bool v = false;
4226     if (super->has_vanilla_constructor()) {
4227       const Method* const constructor =
4228         ik->find_method(vmSymbols::object_initializer_name(),
4229                        vmSymbols::void_method_signature());
4230       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4231         v = true;
4232       }
4233     }
4234     assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4235 #endif
4236   }
4237 
4238   // If it cannot be fast-path allocated, set a bit in the layout helper.
4239   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4240   assert(ik->size_helper() > 0, "layout_helper is initialized");
4241   if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4242       || ik->is_abstract() || ik->is_interface()
4243       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4244       || ik->size_helper() >= FastAllocateSizeLimit) {
4245     // Forbid fast-path allocation.
4246     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4247     ik->set_layout_helper(lh);
4248   }
4249 }
4250 
4251 // Attach super classes and interface classes to class loader data
4252 static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
4253                                               TRAPS) {
4254   assert(defined_klass != NULL, "invariant");
4255 
4256   ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
4257   if (defining_loader_data->is_the_null_class_loader_data()) {
4258       // Dependencies to null class loader data are implicit.
4259       return;
4260   } else {
4261     // add super class dependency
4262     Klass* const super = defined_klass->super();
4263     if (super != NULL) {
4264       defining_loader_data->record_dependency(super, CHECK);
4265     }
4266 
4267     // add super interface dependencies
4268     const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces();
4269     if (local_interfaces != NULL) {
4270       const int length = local_interfaces->length();
4271       for (int i = 0; i < length; i++) {
4272         defining_loader_data->record_dependency(local_interfaces->at(i), CHECK);
4273       }
4274     }
4275   }
4276 }
4277 
4278 // utility methods for appending an array with check for duplicates
4279 
4280 static void append_interfaces(GrowableArray<Klass*>* result,
4281                               const Array<Klass*>* const ifs) {
4282   // iterate over new interfaces
4283   for (int i = 0; i < ifs->length(); i++) {
4284     Klass* const e = ifs->at(i);
4285     assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking");
4286     // add new interface
4287     result->append_if_missing(e);
4288   }
4289 }
4290 
4291 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super,
4292                                                     Array<Klass*>* local_ifs,
4293                                                     ClassLoaderData* loader_data,
4294                                                     TRAPS) {
4295   assert(local_ifs != NULL, "invariant");
4296   assert(loader_data != NULL, "invariant");
4297 
4298   // Compute maximum size for transitive interfaces
4299   int max_transitive_size = 0;
4300   int super_size = 0;
4301   // Add superclass transitive interfaces size
4302   if (super != NULL) {
4303     super_size = super->transitive_interfaces()->length();
4304     max_transitive_size += super_size;
4305   }
4306   // Add local interfaces' super interfaces
4307   const int local_size = local_ifs->length();
4308   for (int i = 0; i < local_size; i++) {
4309     Klass* const l = local_ifs->at(i);
4310     max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length();
4311   }
4312   // Finally add local interfaces
4313   max_transitive_size += local_size;
4314   // Construct array
4315   if (max_transitive_size == 0) {
4316     // no interfaces, use canonicalized array
4317     return Universe::the_empty_klass_array();
4318   } else if (max_transitive_size == super_size) {
4319     // no new local interfaces added, share superklass' transitive interface array
4320     return super->transitive_interfaces();
4321   } else if (max_transitive_size == local_size) {
4322     // only local interfaces added, share local interface array
4323     return local_ifs;
4324   } else {
4325     ResourceMark rm;
4326     GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size);
4327 
4328     // Copy down from superclass
4329     if (super != NULL) {
4330       append_interfaces(result, super->transitive_interfaces());
4331     }
4332 
4333     // Copy down from local interfaces' superinterfaces
4334     for (int i = 0; i < local_size; i++) {
4335       Klass* const l = local_ifs->at(i);
4336       append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces());
4337     }
4338     // Finally add local interfaces
4339     append_interfaces(result, local_ifs);
4340 
4341     // length will be less than the max_transitive_size if duplicates were removed
4342     const int length = result->length();
4343     assert(length <= max_transitive_size, "just checking");
4344     Array<Klass*>* const new_result =
4345       MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL);
4346     for (int i = 0; i < length; i++) {
4347       Klass* const e = result->at(i);
4348       assert(e != NULL, "just checking");
4349       new_result->at_put(i, e);
4350     }
4351     return new_result;
4352   }
4353 }
4354 
4355 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4356   assert(this_klass != NULL, "invariant");
4357   const Klass* const super = this_klass->super();
4358   if ((super != NULL) &&
4359       (!Reflection::verify_class_access(this_klass, super, false))) {
4360     ResourceMark rm(THREAD);
4361     Exceptions::fthrow(
4362       THREAD_AND_LOCATION,
4363       vmSymbols::java_lang_IllegalAccessError(),
4364       "class %s cannot access its superclass %s",
4365       this_klass->external_name(),
4366       super->external_name()
4367     );
4368     return;
4369   }
4370 }
4371 
4372 
4373 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4374   assert(this_klass != NULL, "invariant");
4375   const Array<Klass*>* const local_interfaces = this_klass->local_interfaces();
4376   const int lng = local_interfaces->length();
4377   for (int i = lng - 1; i >= 0; i--) {
4378     Klass* const k = local_interfaces->at(i);
4379     assert (k != NULL && k->is_interface(), "invalid interface");
4380     if (!Reflection::verify_class_access(this_klass, k, false)) {
4381       ResourceMark rm(THREAD);
4382       Exceptions::fthrow(
4383         THREAD_AND_LOCATION,
4384         vmSymbols::java_lang_IllegalAccessError(),
4385         "class %s cannot access its superinterface %s",
4386         this_klass->external_name(),
4387         k->external_name()
4388       );
4389       return;
4390     }
4391   }
4392 }
4393 
4394 
4395 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4396   assert(this_klass != NULL, "invariant");
4397   const Array<Method*>* const methods = this_klass->methods();
4398   const int num_methods = methods->length();
4399 
4400   // go thru each method and check if it overrides a final method
4401   for (int index = 0; index < num_methods; index++) {
4402     const Method* const m = methods->at(index);
4403 
4404     // skip private, static, and <init> methods
4405     if ((!m->is_private() && !m->is_static()) &&
4406         (m->name() != vmSymbols::object_initializer_name())) {
4407 
4408       const Symbol* const name = m->name();
4409       const Symbol* const signature = m->signature();
4410       const Klass* k = this_klass->super();
4411       const Method* super_m = NULL;
4412       while (k != NULL) {
4413         // skip supers that don't have final methods.
4414         if (k->has_final_method()) {
4415           // lookup a matching method in the super class hierarchy
4416           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4417           if (super_m == NULL) {
4418             break; // didn't find any match; get out
4419           }
4420 
4421           if (super_m->is_final() && !super_m->is_static() &&
4422               // matching method in super is final, and not static
4423               (Reflection::verify_field_access(this_klass,
4424                                                super_m->method_holder(),
4425                                                super_m->method_holder(),
4426                                                super_m->access_flags(), false))
4427             // this class can access super final method and therefore override
4428             ) {
4429             ResourceMark rm(THREAD);
4430             Exceptions::fthrow(
4431               THREAD_AND_LOCATION,
4432               vmSymbols::java_lang_VerifyError(),
4433               "class %s overrides final method %s.%s%s",
4434               this_klass->external_name(),
4435               super_m->method_holder()->external_name(),
4436               name->as_C_string(),
4437               signature->as_C_string()
4438             );
4439             return;
4440           }
4441 
4442           // continue to look from super_m's holder's super.
4443           k = super_m->method_holder()->super();
4444           continue;
4445         }
4446 
4447         k = k->super();
4448       }
4449     }
4450   }
4451 }
4452 
4453 
4454 // assumes that this_klass is an interface
4455 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4456   assert(this_klass != NULL, "invariant");
4457   assert(this_klass->is_interface(), "not an interface");
4458   const Array<Method*>* methods = this_klass->methods();
4459   const int num_methods = methods->length();
4460 
4461   for (int index = 0; index < num_methods; index++) {
4462     const Method* const m = methods->at(index);
4463     // if m is static and not the init method, throw a verify error
4464     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4465       ResourceMark rm(THREAD);
4466       Exceptions::fthrow(
4467         THREAD_AND_LOCATION,
4468         vmSymbols::java_lang_VerifyError(),
4469         "Illegal static method %s in interface %s",
4470         m->name()->as_C_string(),
4471         this_klass->external_name()
4472       );
4473       return;
4474     }
4475   }
4476 }
4477 
4478 // utility methods for format checking
4479 
4480 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4481   if (!_need_verify) { return; }
4482 
4483   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4484   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4485   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4486   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4487   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4488   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4489   const bool major_gte_15  = _major_version >= JAVA_1_5_VERSION;
4490 
4491   if ((is_abstract && is_final) ||
4492       (is_interface && !is_abstract) ||
4493       (is_interface && major_gte_15 && (is_super || is_enum)) ||
4494       (!is_interface && major_gte_15 && is_annotation)) {
4495     ResourceMark rm(THREAD);
4496     Exceptions::fthrow(
4497       THREAD_AND_LOCATION,
4498       vmSymbols::java_lang_ClassFormatError(),
4499       "Illegal class modifiers in class %s: 0x%X",
4500       _class_name->as_C_string(), flags
4501     );
4502     return;
4503   }
4504 }
4505 
4506 static bool has_illegal_visibility(jint flags) {
4507   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4508   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4509   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4510 
4511   return ((is_public && is_protected) ||
4512           (is_public && is_private) ||
4513           (is_protected && is_private));
4514 }
4515 
4516 static bool is_supported_version(u2 major, u2 minor){
4517   const u2 max_version = JAVA_MAX_SUPPORTED_VERSION;
4518   return (major >= JAVA_MIN_SUPPORTED_VERSION) &&
4519          (major <= max_version) &&
4520          ((major != max_version) ||
4521           (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION));
4522 }
4523 
4524 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4525                                                    bool is_interface,
4526                                                    TRAPS) const {
4527   if (!_need_verify) { return; }
4528 
4529   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4530   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4531   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4532   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4533   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4534   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4535   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4536   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4537   const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION;
4538 
4539   bool is_illegal = false;
4540 
4541   if (is_interface) {
4542     if (!is_public || !is_static || !is_final || is_private ||
4543         is_protected || is_volatile || is_transient ||
4544         (major_gte_15 && is_enum)) {
4545       is_illegal = true;
4546     }
4547   } else { // not interface
4548     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4549       is_illegal = true;
4550     }
4551   }
4552 
4553   if (is_illegal) {
4554     ResourceMark rm(THREAD);
4555     Exceptions::fthrow(
4556       THREAD_AND_LOCATION,
4557       vmSymbols::java_lang_ClassFormatError(),
4558       "Illegal field modifiers in class %s: 0x%X",
4559       _class_name->as_C_string(), flags);
4560     return;
4561   }
4562 }
4563 
4564 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4565                                                     bool is_interface,
4566                                                     const Symbol* name,
4567                                                     TRAPS) const {
4568   if (!_need_verify) { return; }
4569 
4570   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4571   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4572   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4573   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4574   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4575   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4576   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4577   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4578   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4579   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4580   const bool major_gte_15    = _major_version >= JAVA_1_5_VERSION;
4581   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4582   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4583 
4584   bool is_illegal = false;
4585 
4586   if (is_interface) {
4587     if (major_gte_8) {
4588       // Class file version is JAVA_8_VERSION or later Methods of
4589       // interfaces may set any of the flags except ACC_PROTECTED,
4590       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4591       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4592       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4593           (is_native || is_protected || is_final || is_synchronized) ||
4594           // If a specific method of a class or interface has its
4595           // ACC_ABSTRACT flag set, it must not have any of its
4596           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4597           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4598           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4599           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4600           (is_abstract && (is_private || is_static || is_strict))) {
4601         is_illegal = true;
4602       }
4603     } else if (major_gte_15) {
4604       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4605       if (!is_public || is_private || is_protected || is_static || is_final ||
4606           is_synchronized || is_native || !is_abstract || is_strict) {
4607         is_illegal = true;
4608       }
4609     } else {
4610       // Class file version is pre-JAVA_1_5_VERSION
4611       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4612         is_illegal = true;
4613       }
4614     }
4615   } else { // not interface
4616     if (has_illegal_visibility(flags)) {
4617       is_illegal = true;
4618     } else {
4619       if (is_initializer) {
4620         if (is_static || is_final || is_synchronized || is_native ||
4621             is_abstract || (major_gte_15 && is_bridge)) {
4622           is_illegal = true;
4623         }
4624       } else { // not initializer
4625         if (is_abstract) {
4626           if ((is_final || is_native || is_private || is_static ||
4627               (major_gte_15 && (is_synchronized || is_strict)))) {
4628             is_illegal = true;
4629           }
4630         }
4631       }
4632     }
4633   }
4634 
4635   if (is_illegal) {
4636     ResourceMark rm(THREAD);
4637     Exceptions::fthrow(
4638       THREAD_AND_LOCATION,
4639       vmSymbols::java_lang_ClassFormatError(),
4640       "Method %s in class %s has illegal modifiers: 0x%X",
4641       name->as_C_string(), _class_name->as_C_string(), flags);
4642     return;
4643   }
4644 }
4645 
4646 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4647                                         int length,
4648                                         TRAPS) const {
4649   assert(_need_verify, "only called when _need_verify is true");
4650   int i = 0;
4651   const int count = length >> 2;
4652   for (int k=0; k<count; k++) {
4653     unsigned char b0 = buffer[i];
4654     unsigned char b1 = buffer[i+1];
4655     unsigned char b2 = buffer[i+2];
4656     unsigned char b3 = buffer[i+3];
4657     // For an unsigned char v,
4658     // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
4659     // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
4660     const unsigned char res = b0 | b0 - 1 |
4661                               b1 | b1 - 1 |
4662                               b2 | b2 - 1 |
4663                               b3 | b3 - 1;
4664     if (res >= 128) break;
4665     i += 4;
4666   }
4667   for(; i < length; i++) {
4668     unsigned short c;
4669     // no embedded zeros
4670     guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK);
4671     if(buffer[i] < 128) {
4672       continue;
4673     }
4674     if ((i + 5) < length) { // see if it's legal supplementary character
4675       if (UTF8::is_supplementary_character(&buffer[i])) {
4676         c = UTF8::get_supplementary_character(&buffer[i]);
4677         i += 5;
4678         continue;
4679       }
4680     }
4681     switch (buffer[i] >> 4) {
4682       default: break;
4683       case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
4684         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4685       case 0xC: case 0xD:  // 110xxxxx  10xxxxxx
4686         c = (buffer[i] & 0x1F) << 6;
4687         i++;
4688         if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
4689           c += buffer[i] & 0x3F;
4690           if (_major_version <= 47 || c == 0 || c >= 0x80) {
4691             // for classes with major > 47, c must a null or a character in its shortest form
4692             break;
4693           }
4694         }
4695         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4696       case 0xE:  // 1110xxxx 10xxxxxx 10xxxxxx
4697         c = (buffer[i] & 0xF) << 12;
4698         i += 2;
4699         if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
4700           c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
4701           if (_major_version <= 47 || c >= 0x800) {
4702             // for classes with major > 47, c must be in its shortest form
4703             break;
4704           }
4705         }
4706         classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK);
4707     }  // end of switch
4708   } // end of for
4709 }
4710 
4711 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4712 // Method names also may not contain the characters '<' or '>', unless <init>
4713 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4714 // method.  Because these names have been checked as special cases before
4715 // calling this method in verify_legal_method_name.
4716 static bool verify_unqualified_name(const char* name,
4717                                     unsigned int length,
4718                                     int type) {
4719   for (const char* p = name; p != name + length;) {
4720     jchar ch = *p;
4721     if (ch < 128) {
4722       p++;
4723       if (ch == '.' || ch == ';' || ch == '[') {
4724         return false;   // do not permit '.', ';', or '['
4725       }
4726       if (type != LegalClass && ch == '/') {
4727         return false;   // do not permit '/' unless it's class name
4728       }
4729       if (type == LegalMethod && (ch == '<' || ch == '>')) {
4730         return false;   // do not permit '<' or '>' in method names
4731       }
4732     }
4733     else {
4734       char* tmp_p = UTF8::next(p, &ch);
4735       p = tmp_p;
4736     }
4737   }
4738   return true;
4739 }
4740 
4741 // Take pointer to a string. Skip over the longest part of the string that could
4742 // be taken as a fieldname. Allow '/' if slash_ok is true.
4743 // Return a pointer to just past the fieldname.
4744 // Return NULL if no fieldname at all was found, or in the case of slash_ok
4745 // being true, we saw consecutive slashes (meaning we were looking for a
4746 // qualified path but found something that was badly-formed).
4747 static const char* skip_over_field_name(const char* name,
4748                                         bool slash_ok,
4749                                         unsigned int length) {
4750   const char* p;
4751   jboolean last_is_slash = false;
4752   jboolean not_first_ch = false;
4753 
4754   for (p = name; p != name + length; not_first_ch = true) {
4755     const char* old_p = p;
4756     jchar ch = *p;
4757     if (ch < 128) {
4758       p++;
4759       // quick check for ascii
4760       if ((ch >= 'a' && ch <= 'z') ||
4761         (ch >= 'A' && ch <= 'Z') ||
4762         (ch == '_' || ch == '$') ||
4763         (not_first_ch && ch >= '0' && ch <= '9')) {
4764         last_is_slash = false;
4765         continue;
4766       }
4767       if (slash_ok && ch == '/') {
4768         if (last_is_slash) {
4769           return NULL;  // Don't permit consecutive slashes
4770         }
4771         last_is_slash = true;
4772         continue;
4773       }
4774     }
4775     else {
4776       jint unicode_ch;
4777       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4778       p = tmp_p;
4779       last_is_slash = false;
4780       // Check if ch is Java identifier start or is Java identifier part
4781       // 4672820: call java.lang.Character methods directly without generating separate tables.
4782       EXCEPTION_MARK;
4783 
4784       // return value
4785       JavaValue result(T_BOOLEAN);
4786       // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart
4787       JavaCallArguments args;
4788       args.push_int(unicode_ch);
4789 
4790       // public static boolean isJavaIdentifierStart(char ch);
4791       JavaCalls::call_static(&result,
4792         SystemDictionary::Character_klass(),
4793         vmSymbols::isJavaIdentifierStart_name(),
4794         vmSymbols::int_bool_signature(),
4795         &args,
4796         THREAD);
4797 
4798       if (HAS_PENDING_EXCEPTION) {
4799         CLEAR_PENDING_EXCEPTION;
4800         return 0;
4801       }
4802       if (result.get_jboolean()) {
4803         continue;
4804       }
4805 
4806       if (not_first_ch) {
4807         // public static boolean isJavaIdentifierPart(char ch);
4808         JavaCalls::call_static(&result,
4809           SystemDictionary::Character_klass(),
4810           vmSymbols::isJavaIdentifierPart_name(),
4811           vmSymbols::int_bool_signature(),
4812           &args,
4813           THREAD);
4814 
4815         if (HAS_PENDING_EXCEPTION) {
4816           CLEAR_PENDING_EXCEPTION;
4817           return 0;
4818         }
4819 
4820         if (result.get_jboolean()) {
4821           continue;
4822         }
4823       }
4824     }
4825     return (not_first_ch) ? old_p : NULL;
4826   }
4827   return (not_first_ch) ? p : NULL;
4828 }
4829 
4830 // Take pointer to a string. Skip over the longest part of the string that could
4831 // be taken as a field signature. Allow "void" if void_ok.
4832 // Return a pointer to just past the signature.
4833 // Return NULL if no legal signature is found.
4834 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4835                                                        bool void_ok,
4836                                                        unsigned int length,
4837                                                        TRAPS) const {
4838   unsigned int array_dim = 0;
4839   while (length > 0) {
4840     switch (signature[0]) {
4841     case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4842     case JVM_SIGNATURE_BOOLEAN:
4843     case JVM_SIGNATURE_BYTE:
4844     case JVM_SIGNATURE_CHAR:
4845     case JVM_SIGNATURE_SHORT:
4846     case JVM_SIGNATURE_INT:
4847     case JVM_SIGNATURE_FLOAT:
4848     case JVM_SIGNATURE_LONG:
4849     case JVM_SIGNATURE_DOUBLE:
4850       return signature + 1;
4851     case JVM_SIGNATURE_CLASS: {
4852       if (_major_version < JAVA_1_5_VERSION) {
4853         // Skip over the class name if one is there
4854         const char* const p = skip_over_field_name(signature + 1, true, --length);
4855 
4856         // The next character better be a semicolon
4857         if (p && (p - signature) > 1 && p[0] == ';') {
4858           return p + 1;
4859         }
4860       }
4861       else {
4862         // 4900761: For class version > 48, any unicode is allowed in class name.
4863         length--;
4864         signature++;
4865         while (length > 0 && signature[0] != ';') {
4866           if (signature[0] == '.') {
4867             classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0);
4868           }
4869           length--;
4870           signature++;
4871         }
4872         if (signature[0] == ';') { return signature + 1; }
4873       }
4874 
4875       return NULL;
4876     }
4877     case JVM_SIGNATURE_ARRAY:
4878       array_dim++;
4879       if (array_dim > 255) {
4880         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4881         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0);
4882       }
4883       // The rest of what's there better be a legal signature
4884       signature++;
4885       length--;
4886       void_ok = false;
4887       break;
4888 
4889     default:
4890       return NULL;
4891     }
4892   }
4893   return NULL;
4894 }
4895 
4896 // Checks if name is a legal class name.
4897 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4898   if (!_need_verify || _relax_verify) { return; }
4899 
4900   char buf[fixed_buffer_size];
4901   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4902   unsigned int length = name->utf8_length();
4903   bool legal = false;
4904 
4905   if (length > 0) {
4906     const char* p;
4907     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4908       p = skip_over_field_signature(bytes, false, length, CHECK);
4909       legal = (p != NULL) && ((p - bytes) == (int)length);
4910     } else if (_major_version < JAVA_1_5_VERSION) {
4911       if (bytes[0] != '<') {
4912         p = skip_over_field_name(bytes, true, length);
4913         legal = (p != NULL) && ((p - bytes) == (int)length);
4914       }
4915     } else {
4916       // 4900761: relax the constraints based on JSR202 spec
4917       // Class names may be drawn from the entire Unicode character set.
4918       // Identifiers between '/' must be unqualified names.
4919       // The utf8 string has been verified when parsing cpool entries.
4920       legal = verify_unqualified_name(bytes, length, LegalClass);
4921     }
4922   }
4923   if (!legal) {
4924     ResourceMark rm(THREAD);
4925     assert(_class_name != NULL, "invariant");
4926     Exceptions::fthrow(
4927       THREAD_AND_LOCATION,
4928       vmSymbols::java_lang_ClassFormatError(),
4929       "Illegal class name \"%s\" in class file %s", bytes,
4930       _class_name->as_C_string()
4931     );
4932     return;
4933   }
4934 }
4935 
4936 // Checks if name is a legal field name.
4937 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4938   if (!_need_verify || _relax_verify) { return; }
4939 
4940   char buf[fixed_buffer_size];
4941   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4942   unsigned int length = name->utf8_length();
4943   bool legal = false;
4944 
4945   if (length > 0) {
4946     if (_major_version < JAVA_1_5_VERSION) {
4947       if (bytes[0] != '<') {
4948         const char* p = skip_over_field_name(bytes, false, length);
4949         legal = (p != NULL) && ((p - bytes) == (int)length);
4950       }
4951     } else {
4952       // 4881221: relax the constraints based on JSR202 spec
4953       legal = verify_unqualified_name(bytes, length, LegalField);
4954     }
4955   }
4956 
4957   if (!legal) {
4958     ResourceMark rm(THREAD);
4959     assert(_class_name != NULL, "invariant");
4960     Exceptions::fthrow(
4961       THREAD_AND_LOCATION,
4962       vmSymbols::java_lang_ClassFormatError(),
4963       "Illegal field name \"%s\" in class %s", bytes,
4964       _class_name->as_C_string()
4965     );
4966     return;
4967   }
4968 }
4969 
4970 // Checks if name is a legal method name.
4971 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4972   if (!_need_verify || _relax_verify) { return; }
4973 
4974   assert(name != NULL, "method name is null");
4975   char buf[fixed_buffer_size];
4976   char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
4977   unsigned int length = name->utf8_length();
4978   bool legal = false;
4979 
4980   if (length > 0) {
4981     if (bytes[0] == '<') {
4982       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4983         legal = true;
4984       }
4985     } else if (_major_version < JAVA_1_5_VERSION) {
4986       const char* p;
4987       p = skip_over_field_name(bytes, false, length);
4988       legal = (p != NULL) && ((p - bytes) == (int)length);
4989     } else {
4990       // 4881221: relax the constraints based on JSR202 spec
4991       legal = verify_unqualified_name(bytes, length, LegalMethod);
4992     }
4993   }
4994 
4995   if (!legal) {
4996     ResourceMark rm(THREAD);
4997     assert(_class_name != NULL, "invariant");
4998     Exceptions::fthrow(
4999       THREAD_AND_LOCATION,
5000       vmSymbols::java_lang_ClassFormatError(),
5001       "Illegal method name \"%s\" in class %s", bytes,
5002       _class_name->as_C_string()
5003     );
5004     return;
5005   }
5006 }
5007 
5008 
5009 // Checks if signature is a legal field signature.
5010 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5011                                                    const Symbol* signature,
5012                                                    TRAPS) const {
5013   if (!_need_verify) { return; }
5014 
5015   char buf[fixed_buffer_size];
5016   const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5017   const unsigned int length = signature->utf8_length();
5018   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5019 
5020   if (p == NULL || (p - bytes) != (int)length) {
5021     throwIllegalSignature("Field", name, signature, CHECK);
5022   }
5023 }
5024 
5025 // Checks if signature is a legal method signature.
5026 // Returns number of parameters
5027 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5028                                                    const Symbol* signature,
5029                                                    TRAPS) const {
5030   if (!_need_verify) {
5031     // make sure caller's args_size will be less than 0 even for non-static
5032     // method so it will be recomputed in compute_size_of_parameters().
5033     return -2;
5034   }
5035 
5036   // Class initializers cannot have args for class format version >= 51.
5037   if (name == vmSymbols::class_initializer_name() &&
5038       signature != vmSymbols::void_method_signature() &&
5039       _major_version >= JAVA_7_VERSION) {
5040     throwIllegalSignature("Method", name, signature, CHECK_0);
5041     return 0;
5042   }
5043 
5044   unsigned int args_size = 0;
5045   char buf[fixed_buffer_size];
5046   const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size);
5047   unsigned int length = signature->utf8_length();
5048   const char* nextp;
5049 
5050   // The first character must be a '('
5051   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5052     length--;
5053     // Skip over legal field signatures
5054     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5055     while ((length > 0) && (nextp != NULL)) {
5056       args_size++;
5057       if (p[0] == 'J' || p[0] == 'D') {
5058         args_size++;
5059       }
5060       length -= nextp - p;
5061       p = nextp;
5062       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5063     }
5064     // The first non-signature thing better be a ')'
5065     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5066       length--;
5067       if (name->utf8_length() > 0 && name->byte_at(0) == '<') {
5068         // All internal methods must return void
5069         if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) {
5070           return args_size;
5071         }
5072       } else {
5073         // Now we better just have a return value
5074         nextp = skip_over_field_signature(p, true, length, CHECK_0);
5075         if (nextp && ((int)length == (nextp - p))) {
5076           return args_size;
5077         }
5078       }
5079     }
5080   }
5081   // Report error
5082   throwIllegalSignature("Method", name, signature, CHECK_0);
5083   return 0;
5084 }
5085 
5086 int ClassFileParser::static_field_size() const {
5087   assert(_field_info != NULL, "invariant");
5088   return _field_info->static_field_size;
5089 }
5090 
5091 int ClassFileParser::total_oop_map_count() const {
5092   assert(_field_info != NULL, "invariant");
5093   return _field_info->total_oop_map_count;
5094 }
5095 
5096 jint ClassFileParser::layout_size() const {
5097   assert(_field_info != NULL, "invariant");
5098   return _field_info->instance_size;
5099 }
5100 
5101 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5102                                          const Array<Method*>* methods) {
5103   assert(ik != NULL, "invariant");
5104   assert(methods != NULL, "invariant");
5105 
5106   // Set up Method*::intrinsic_id as soon as we know the names of methods.
5107   // (We used to do this lazily, but now we query it in Rewriter,
5108   // which is eagerly done for every method, so we might as well do it now,
5109   // when everything is fresh in memory.)
5110   const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik);
5111 
5112   if (klass_id != vmSymbols::NO_SID) {
5113     for (int j = 0; j < methods->length(); ++j) {
5114       Method* method = methods->at(j);
5115       method->init_intrinsic_id();
5116 
5117       if (CheckIntrinsics) {
5118         // Check if an intrinsic is defined for method 'method',
5119         // but the method is not annotated with @HotSpotIntrinsicCandidate.
5120         if (method->intrinsic_id() != vmIntrinsics::_none &&
5121             !method->intrinsic_candidate()) {
5122               tty->print("Compiler intrinsic is defined for method [%s], "
5123               "but the method is not annotated with @HotSpotIntrinsicCandidate.%s",
5124               method->name_and_sig_as_C_string(),
5125               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5126             );
5127           tty->cr();
5128           DEBUG_ONLY(vm_exit(1));
5129         }
5130         // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate,
5131         // but there is no intrinsic available for it.
5132         if (method->intrinsic_candidate() &&
5133           method->intrinsic_id() == vmIntrinsics::_none) {
5134             tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, "
5135               "but no compiler intrinsic is defined for the method.%s",
5136               method->name_and_sig_as_C_string(),
5137               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5138             );
5139           tty->cr();
5140           DEBUG_ONLY(vm_exit(1));
5141         }
5142       }
5143     } // end for
5144 
5145 #ifdef ASSERT
5146     if (CheckIntrinsics) {
5147       // Check for orphan methods in the current class. A method m
5148       // of a class C is orphan if an intrinsic is defined for method m,
5149       // but class C does not declare m.
5150       // The check is potentially expensive, therefore it is available
5151       // only in debug builds.
5152 
5153       for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) {
5154         if (vmIntrinsics::_compiledLambdaForm == id) {
5155           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5156           // generated for the JVM from a LambdaForm and therefore no method
5157           // is defined for it.
5158           continue;
5159         }
5160 
5161         if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) {
5162           // Check if the current class contains a method with the same
5163           // name, flags, signature.
5164           bool match = false;
5165           for (int j = 0; j < methods->length(); ++j) {
5166             const Method* method = methods->at(j);
5167             if (method->intrinsic_id() == id) {
5168               match = true;
5169               break;
5170             }
5171           }
5172 
5173           if (!match) {
5174             char buf[1000];
5175             tty->print("Compiler intrinsic is defined for method [%s], "
5176                        "but the method is not available in class [%s].%s",
5177                         vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id),
5178                                                              buf, sizeof(buf)),
5179                         ik->name()->as_C_string(),
5180                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5181             );
5182             tty->cr();
5183             DEBUG_ONLY(vm_exit(1));
5184           }
5185         }
5186       } // end for
5187     } // CheckIntrinsics
5188 #endif // ASSERT
5189   }
5190 }
5191 
5192 InstanceKlass* ClassFileParser::create_instance_klass(TRAPS) {
5193   if (_klass != NULL) {
5194     return _klass;
5195   }
5196 
5197   InstanceKlass* const ik =
5198     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5199 
5200   fill_instance_klass(ik, CHECK_NULL);
5201 
5202   assert(_klass == ik, "invariant");
5203 
5204   return ik;
5205 }
5206 
5207 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, TRAPS) {
5208   assert(ik != NULL, "invariant");
5209 
5210   set_klass_to_deallocate(ik);
5211 
5212   assert(_field_info != NULL, "invariant");
5213   assert(ik->static_field_size() == _field_info->static_field_size, "sanity");
5214   assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count,
5215     "sanity");
5216 
5217   assert(ik->is_instance_klass(), "sanity");
5218   assert(ik->size_helper() == _field_info->instance_size, "sanity");
5219 
5220   // Fill in information already parsed
5221   ik->set_should_verify_class(_need_verify);
5222 
5223   // Not yet: supers are done below to support the new subtype-checking fields
5224   ik->set_class_loader_data(_loader_data);
5225   ik->set_nonstatic_field_size(_field_info->nonstatic_field_size);
5226   ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields);
5227   assert(_fac != NULL, "invariant");
5228   ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5229 
5230   // this transfers ownership of a lot of arrays from
5231   // the parser onto the InstanceKlass*
5232   apply_parsed_class_metadata(ik, _java_fields_count, CHECK);
5233 
5234   // note that is not safe to use the fields in the parser from this point on
5235   assert(NULL == _cp, "invariant");
5236   assert(NULL == _fields, "invariant");
5237   assert(NULL == _methods, "invariant");
5238   assert(NULL == _inner_classes, "invariant");
5239   assert(NULL == _local_interfaces, "invariant");
5240   assert(NULL == _transitive_interfaces, "invariant");
5241   assert(NULL == _combined_annotations, "invariant");
5242 
5243   if (_has_final_method) {
5244     ik->set_has_final_method();
5245   }
5246 
5247   ik->copy_method_ordering(_method_ordering, CHECK);
5248   // The InstanceKlass::_methods_jmethod_ids cache
5249   // is managed on the assumption that the initial cache
5250   // size is equal to the number of methods in the class. If
5251   // that changes, then InstanceKlass::idnum_can_increment()
5252   // has to be changed accordingly.
5253   ik->set_initial_method_idnum(ik->methods()->length());
5254 
5255   ik->set_name(_class_name);
5256 
5257   if (is_anonymous()) {
5258     // I am well known to myself
5259     ik->constants()->klass_at_put(_this_class_index, ik); // eagerly resolve
5260   }
5261 
5262   ik->set_minor_version(_minor_version);
5263   ik->set_major_version(_major_version);
5264   ik->set_has_default_methods(_has_default_methods);
5265   ik->set_declares_default_methods(_declares_default_methods);
5266 
5267   if (_host_klass != NULL) {
5268     assert (ik->is_anonymous(), "should be the same");
5269     ik->set_host_klass(_host_klass);
5270   }
5271 
5272   const Array<Method*>* const methods = ik->methods();
5273   assert(methods != NULL, "invariant");
5274   const int methods_len = methods->length();
5275 
5276   check_methods_for_intrinsics(ik, methods);
5277 
5278   // Fill in field values obtained by parse_classfile_attributes
5279   if (_parsed_annotations->has_any_annotations()) {
5280     _parsed_annotations->apply_to(ik);
5281   }
5282 
5283   apply_parsed_class_attributes(ik);
5284 
5285   // Miranda methods
5286   if ((_num_miranda_methods > 0) ||
5287       // if this class introduced new miranda methods or
5288       (_super_klass != NULL && _super_klass->has_miranda_methods())
5289         // super class exists and this class inherited miranda methods
5290      ) {
5291        ik->set_has_miranda_methods(); // then set a flag
5292   }
5293 
5294   // Fill in information needed to compute superclasses.
5295   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK);
5296 
5297   // Initialize itable offset tables
5298   klassItable::setup_itable_offset_table(ik);
5299 
5300   // Compute transitive closure of interfaces this class implements
5301   // Do final class setup
5302   fill_oop_maps(ik,
5303                 _field_info->nonstatic_oop_map_count,
5304                 _field_info->nonstatic_oop_offsets,
5305                 _field_info->nonstatic_oop_counts);
5306 
5307   // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5308   set_precomputed_flags(ik);
5309 
5310   // check if this class can access its super class
5311   check_super_class_access(ik, CHECK);
5312 
5313   // check if this class can access its superinterfaces
5314   check_super_interface_access(ik, CHECK);
5315 
5316   // check if this class overrides any final method
5317   check_final_method_override(ik, CHECK);
5318 
5319   // check that if this class is an interface then it doesn't have static methods
5320   if (ik->is_interface()) {
5321     /* An interface in a JAVA 8 classfile can be static */
5322     if (_major_version < JAVA_8_VERSION) {
5323       check_illegal_static_method(ik, CHECK);
5324     }
5325   }
5326 
5327   // Allocate mirror and initialize static fields
5328   // The create_mirror() call will also call compute_modifiers()
5329   java_lang_Class::create_mirror(ik,
5330                                  _loader_data->class_loader(),
5331                                  _protection_domain,
5332                                  CHECK);
5333 
5334   assert(_all_mirandas != NULL, "invariant");
5335 
5336   // Generate any default methods - default methods are interface methods
5337   // that have a default implementation.  This is new with Lambda project.
5338   if (_has_default_methods ) {
5339     DefaultMethods::generate_default_methods(ik,
5340                                              _all_mirandas,
5341                                              CHECK);
5342   }
5343 
5344   // Update the loader_data graph.
5345   record_defined_class_dependencies(ik, CHECK);
5346 
5347   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5348 
5349   if (!is_internal()) {
5350     if (TraceClassLoading) {
5351       ResourceMark rm;
5352       // print in a single call to reduce interleaving of output
5353       if (_stream->source() != NULL) {
5354         tty->print("[Loaded %s from %s]\n",
5355                    ik->external_name(),
5356                    _stream->source());
5357       } else if (_loader_data->class_loader() == NULL) {
5358         const Klass* const caller =
5359           THREAD->is_Java_thread()
5360                 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
5361                 : NULL;
5362         // caller can be NULL, for example, during a JVMTI VM_Init hook
5363         if (caller != NULL) {
5364           tty->print("[Loaded %s by instance of %s]\n",
5365                      ik->external_name(),
5366                      caller->external_name());
5367         } else {
5368           tty->print("[Loaded %s]\n", ik->external_name());
5369         }
5370       } else {
5371         tty->print("[Loaded %s from %s]\n", ik->external_name(),
5372                    _loader_data->class_loader()->klass()->external_name());
5373       }
5374     }
5375 
5376     if (log_is_enabled(Info, classresolve))  {
5377       ResourceMark rm;
5378       // print out the superclass.
5379       const char * from = ik->external_name();
5380       if (ik->java_super() != NULL) {
5381         log_info(classresolve)("%s %s (super)",
5382                    from,
5383                    ik->java_super()->external_name());
5384       }
5385       // print out each of the interface classes referred to by this class.
5386       const Array<Klass*>* const local_interfaces = ik->local_interfaces();
5387       if (local_interfaces != NULL) {
5388         const int length = local_interfaces->length();
5389         for (int i = 0; i < length; i++) {
5390           const Klass* const k = local_interfaces->at(i);
5391           const char * to = k->external_name();
5392           log_info(classresolve)("%s %s (interface)", from, to);
5393         }
5394       }
5395     }
5396   }
5397 
5398   TRACE_INIT_ID(ik);
5399 
5400   // If we reach here, all is well.
5401   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5402   // in order for it to not be destroyed in the ClassFileParser destructor.
5403   set_klass_to_deallocate(NULL);
5404 
5405   // it's official
5406   set_klass(ik);
5407 
5408   debug_only(ik->verify();)
5409 }
5410 
5411 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5412                                  Symbol* name,
5413                                  ClassLoaderData* loader_data,
5414                                  Handle protection_domain,
5415                                  TempNewSymbol* parsed_name,
5416                                  const Klass* host_klass,
5417                                  GrowableArray<Handle>* cp_patches,
5418                                  Publicity pub_level,
5419                                  TRAPS) :
5420   _stream(stream),
5421   _requested_name(name),
5422   _loader_data(loader_data),
5423   _host_klass(host_klass),
5424   _cp_patches(cp_patches),
5425   _parsed_name(parsed_name),
5426   _super_klass(),
5427   _cp(NULL),
5428   _fields(NULL),
5429   _methods(NULL),
5430   _inner_classes(NULL),
5431   _local_interfaces(NULL),
5432   _transitive_interfaces(NULL),
5433   _combined_annotations(NULL),
5434   _annotations(NULL),
5435   _type_annotations(NULL),
5436   _fields_annotations(NULL),
5437   _fields_type_annotations(NULL),
5438   _klass(NULL),
5439   _klass_to_deallocate(NULL),
5440   _parsed_annotations(NULL),
5441   _fac(NULL),
5442   _field_info(NULL),
5443   _method_ordering(NULL),
5444   _all_mirandas(NULL),
5445   _vtable_size(0),
5446   _itable_size(0),
5447   _num_miranda_methods(0),
5448   _rt(REF_NONE),
5449   _protection_domain(protection_domain),
5450   _access_flags(),
5451   _pub_level(pub_level),
5452   _synthetic_flag(false),
5453   _sde_length(false),
5454   _sde_buffer(NULL),
5455   _sourcefile_index(0),
5456   _generic_signature_index(0),
5457   _major_version(0),
5458   _minor_version(0),
5459   _this_class_index(0),
5460   _super_class_index(0),
5461   _itfs_len(0),
5462   _java_fields_count(0),
5463   _need_verify(false),
5464   _relax_verify(false),
5465   _has_default_methods(false),
5466   _declares_default_methods(false),
5467   _has_final_method(false),
5468   _has_finalizer(false),
5469   _has_empty_finalizer(false),
5470   _has_vanilla_constructor(false),
5471   _max_bootstrap_specifier_index(-1) {
5472 
5473   _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5474 
5475   assert(THREAD->is_Java_thread(), "invariant");
5476   assert(_loader_data != NULL, "invariant");
5477   assert(stream != NULL, "invariant");
5478   assert(_stream != NULL, "invariant");
5479   assert(_stream->buffer() == _stream->current(), "invariant");
5480   assert(_class_name != NULL, "invariant");
5481   assert(0 == _access_flags.as_int(), "invariant");
5482 
5483   // Figure out whether we can skip format checking (matching classic VM behavior)
5484   if (DumpSharedSpaces) {
5485     // verify == true means it's a 'remote' class (i.e., non-boot class)
5486     // Verification decision is based on BytecodeVerificationRemote flag
5487     // for those classes.
5488     _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5489                                               BytecodeVerificationLocal;
5490   }
5491   else {
5492     _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5493                                                stream->need_verify());
5494   }
5495 
5496   // synch back verification state to stream
5497   stream->set_verify(_need_verify);
5498 
5499   // Check if verification needs to be relaxed for this class file
5500   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5501   _relax_verify = Verifier::relax_verify_for(_loader_data->class_loader());
5502 
5503   parse_stream(stream, CHECK);
5504 
5505   post_process_parsed_stream(stream, _cp, CHECK);
5506 }
5507 
5508 void ClassFileParser::clear_class_metadata() {
5509   // metadata created before the instance klass is created.  Must be
5510   // deallocated if classfile parsing returns an error.
5511   _cp = NULL;
5512   _fields = NULL;
5513   _methods = NULL;
5514   _inner_classes = NULL;
5515   _local_interfaces = NULL;
5516   _transitive_interfaces = NULL;
5517   _combined_annotations = NULL;
5518   _annotations = _type_annotations = NULL;
5519   _fields_annotations = _fields_type_annotations = NULL;
5520 }
5521 
5522 // Destructor to clean up
5523 ClassFileParser::~ClassFileParser() {
5524   if (_cp != NULL) {
5525     MetadataFactory::free_metadata(_loader_data, _cp);
5526   }
5527   if (_fields != NULL) {
5528     MetadataFactory::free_array<u2>(_loader_data, _fields);
5529   }
5530 
5531   if (_methods != NULL) {
5532     // Free methods
5533     InstanceKlass::deallocate_methods(_loader_data, _methods);
5534   }
5535 
5536   // beware of the Universe::empty_blah_array!!
5537   if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5538     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5539   }
5540 
5541   // Free interfaces
5542   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5543                                        _local_interfaces, _transitive_interfaces);
5544 
5545   if (_combined_annotations != NULL) {
5546     // After all annotations arrays have been created, they are installed into the
5547     // Annotations object that will be assigned to the InstanceKlass being created.
5548 
5549     // Deallocate the Annotations object and the installed annotations arrays.
5550     _combined_annotations->deallocate_contents(_loader_data);
5551 
5552     // If the _combined_annotations pointer is non-NULL,
5553     // then the other annotations fields should have been cleared.
5554     assert(_annotations             == NULL, "Should have been cleared");
5555     assert(_type_annotations        == NULL, "Should have been cleared");
5556     assert(_fields_annotations      == NULL, "Should have been cleared");
5557     assert(_fields_type_annotations == NULL, "Should have been cleared");
5558   } else {
5559     // If the annotations arrays were not installed into the Annotations object,
5560     // then they have to be deallocated explicitly.
5561     MetadataFactory::free_array<u1>(_loader_data, _annotations);
5562     MetadataFactory::free_array<u1>(_loader_data, _type_annotations);
5563     Annotations::free_contents(_loader_data, _fields_annotations);
5564     Annotations::free_contents(_loader_data, _fields_type_annotations);
5565   }
5566 
5567   clear_class_metadata();
5568 
5569   // deallocate the klass if already created.  Don't directly deallocate, but add
5570   // to the deallocate list so that the klass is removed from the CLD::_klasses list
5571   // at a safepoint.
5572   if (_klass_to_deallocate != NULL) {
5573     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5574   }
5575 }
5576 
5577 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5578                                    TRAPS) {
5579 
5580   assert(stream != NULL, "invariant");
5581   assert(_class_name != NULL, "invariant");
5582 
5583   // BEGIN STREAM PARSING
5584   stream->guarantee_more(8, CHECK);  // magic, major, minor
5585   // Magic value
5586   const u4 magic = stream->get_u4_fast();
5587   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5588                      "Incompatible magic value %u in class file %s",
5589                      magic, CHECK);
5590 
5591   // Version numbers
5592   _minor_version = stream->get_u2_fast();
5593   _major_version = stream->get_u2_fast();
5594 
5595   if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) {
5596     ResourceMark rm;
5597     warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s",
5598             _major_version,  _minor_version, _class_name->as_C_string());
5599     Exceptions::fthrow(
5600       THREAD_AND_LOCATION,
5601       vmSymbols::java_lang_UnsupportedClassVersionError(),
5602       "Unsupported major.minor version for dump time %u.%u",
5603       _major_version,
5604       _minor_version);
5605   }
5606 
5607   // Check version numbers - we check this even with verifier off
5608   if (!is_supported_version(_major_version, _minor_version)) {
5609     ResourceMark rm(THREAD);
5610     Exceptions::fthrow(
5611       THREAD_AND_LOCATION,
5612       vmSymbols::java_lang_UnsupportedClassVersionError(),
5613       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
5614       "this version of the Java Runtime only recognizes class file versions up to %u.%u",
5615       _class_name->as_C_string(),
5616       _major_version,
5617       _minor_version,
5618       JAVA_MAX_SUPPORTED_VERSION,
5619       JAVA_MAX_SUPPORTED_MINOR_VERSION);
5620     return;
5621   }
5622 
5623   stream->guarantee_more(3, CHECK); // length, first cp tag
5624   const u2 cp_size = stream->get_u2_fast();
5625 
5626   guarantee_property(
5627     cp_size >= 1, "Illegal constant pool size %u in class file %s",
5628     cp_size, CHECK);
5629 
5630   _cp = ConstantPool::allocate(_loader_data,
5631                                cp_size,
5632                                CHECK);
5633 
5634   ConstantPool* const cp = _cp;
5635 
5636   parse_constant_pool(stream, cp, cp_size, CHECK);
5637 
5638   assert(cp_size == (const u2)cp->length(), "invariant");
5639 
5640   // ACCESS FLAGS
5641   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
5642 
5643   // Access flags
5644   jint flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5645 
5646   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5647     // Set abstract bit for old class files for backward compatibility
5648     flags |= JVM_ACC_ABSTRACT;
5649   }
5650 
5651   _access_flags.set_flags(flags);
5652 
5653   verify_legal_class_modifiers((jint)_access_flags.as_int(), CHECK);
5654 
5655   // This class and superclass
5656   _this_class_index = stream->get_u2_fast();
5657   check_property(
5658     valid_cp_range(_this_class_index, cp_size) &&
5659       cp->tag_at(_this_class_index).is_unresolved_klass(),
5660     "Invalid this class index %u in constant pool in class file %s",
5661     _this_class_index, CHECK);
5662 
5663   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5664   assert(class_name_in_cp != NULL, "class_name can't be null");
5665 
5666   if (_parsed_name != NULL) {
5667     // It's important to set parsed_name *before* resolving the super class.
5668     // (it's used for cleanup by the caller if parsing fails)
5669     *_parsed_name = class_name_in_cp;
5670     // parsed_name is returned and can be used if there's an error, so add to
5671     // its reference count.  Caller will decrement the refcount.
5672     (*_parsed_name)->increment_refcount();
5673   }
5674 
5675   // Update _class_name which could be null previously
5676   // to reflect the name in the constant pool
5677   _class_name = class_name_in_cp;
5678 
5679   // Don't need to check whether this class name is legal or not.
5680   // It has been checked when constant pool is parsed.
5681   // However, make sure it is not an array type.
5682   if (_need_verify) {
5683     guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY,
5684                        "Bad class name in class file %s",
5685                        CHECK);
5686   }
5687 
5688   // Checks if name in class file matches requested name
5689   if (_requested_name != NULL && _requested_name != _class_name) {
5690     ResourceMark rm(THREAD);
5691     Exceptions::fthrow(
5692       THREAD_AND_LOCATION,
5693       vmSymbols::java_lang_NoClassDefFoundError(),
5694       "%s (wrong name: %s)",
5695       _class_name->as_C_string(),
5696       _requested_name != NULL ? _requested_name->as_C_string() : "NoName"
5697     );
5698     return;
5699   }
5700 
5701   if (!is_internal()) {
5702     if (TraceClassLoadingPreorder) {
5703       tty->print("[Loading %s",
5704         _class_name->as_klass_external_name());
5705 
5706       if (stream->source() != NULL) {
5707         tty->print(" from %s", stream->source());
5708       }
5709       tty->print_cr("]");
5710     }
5711 #if INCLUDE_CDS
5712     if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) {
5713       // Only dump the classes that can be stored into CDS archive
5714       if (SystemDictionaryShared::is_sharing_possible(_loader_data)) {
5715         ResourceMark rm(THREAD);
5716         classlist_file->print_cr("%s", _class_name->as_C_string());
5717         classlist_file->flush();
5718       }
5719     }
5720 #endif
5721   }
5722 
5723   // SUPERKLASS
5724   _super_class_index = stream->get_u2_fast();
5725   _super_klass = parse_super_class(cp,
5726                                    _super_class_index,
5727                                    _need_verify,
5728                                    CHECK);
5729 
5730   // Interfaces
5731   _itfs_len = stream->get_u2_fast();
5732   parse_interfaces(stream,
5733                    _itfs_len,
5734                    cp,
5735                    &_has_default_methods,
5736                    CHECK);
5737 
5738   assert(_local_interfaces != NULL, "invariant");
5739 
5740   // Fields (offsets are filled in later)
5741   _fac = new FieldAllocationCount();
5742   parse_fields(stream,
5743                _access_flags.is_interface(),
5744                _fac,
5745                cp,
5746                cp_size,
5747                &_java_fields_count,
5748                CHECK);
5749 
5750   assert(_fields != NULL, "invariant");
5751 
5752   // Methods
5753   AccessFlags promoted_flags;
5754   parse_methods(stream,
5755                 _access_flags.is_interface(),
5756                 &promoted_flags,
5757                 &_has_final_method,
5758                 &_declares_default_methods,
5759                 CHECK);
5760 
5761   assert(_methods != NULL, "invariant");
5762 
5763   // promote flags from parse_methods() to the klass' flags
5764   _access_flags.add_promoted_flags(promoted_flags.as_int());
5765 
5766   if (_declares_default_methods) {
5767     _has_default_methods = true;
5768   }
5769 
5770   // Additional attributes/annotations
5771   _parsed_annotations = new ClassAnnotationCollector();
5772   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5773 
5774   assert(_inner_classes != NULL, "invariant");
5775 
5776   // Finalize the Annotations metadata object,
5777   // now that all annotation arrays have been created.
5778   create_combined_annotations(CHECK);
5779 
5780   // Make sure this is the end of class file stream
5781   guarantee_property(stream->at_eos(),
5782                      "Extra bytes at the end of class file %s",
5783                      CHECK);
5784 
5785   // all bytes in stream read and parsed
5786 }
5787 
5788 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5789                                                  ConstantPool* cp,
5790                                                  TRAPS) {
5791   assert(stream != NULL, "invariant");
5792   assert(stream->at_eos(), "invariant");
5793   assert(cp != NULL, "invariant");
5794   assert(_loader_data != NULL, "invariant");
5795 
5796   // We check super class after class file is parsed and format is checked
5797   if (_super_class_index > 0 && NULL ==_super_klass) {
5798     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5799     if (_access_flags.is_interface()) {
5800       // Before attempting to resolve the superclass, check for class format
5801       // errors not checked yet.
5802       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5803         "Interfaces must have java.lang.Object as superclass in class file %s",
5804         CHECK);
5805       }
5806       _super_klass = (const InstanceKlass*)
5807                        SystemDictionary::resolve_super_or_fail(_class_name,
5808                                                                super_class_name,
5809                                                                _loader_data->class_loader(),
5810                                                                _protection_domain,
5811                                                                true,
5812                                                                CHECK);
5813   }
5814 
5815   if (_super_klass != NULL) {
5816     if (_super_klass->has_default_methods()) {
5817       _has_default_methods = true;
5818     }
5819 
5820     if (_super_klass->is_interface()) {
5821       ResourceMark rm(THREAD);
5822       Exceptions::fthrow(
5823         THREAD_AND_LOCATION,
5824         vmSymbols::java_lang_IncompatibleClassChangeError(),
5825         "class %s has interface %s as super class",
5826         _class_name->as_klass_external_name(),
5827         _super_klass->external_name()
5828       );
5829       return;
5830     }
5831     // Make sure super class is not final
5832     if (_super_klass->is_final()) {
5833       THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class");
5834     }
5835   }
5836 
5837   // Compute the transitive list of all unique interfaces implemented by this class
5838   _transitive_interfaces =
5839     compute_transitive_interfaces(_super_klass,
5840                                   _local_interfaces,
5841                                   _loader_data,
5842                                   CHECK);
5843 
5844   assert(_transitive_interfaces != NULL, "invariant");
5845 
5846   // sort methods
5847   _method_ordering = sort_methods(_methods);
5848 
5849   _all_mirandas = new GrowableArray<Method*>(20);
5850 
5851   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5852                                                     &_num_miranda_methods,
5853                                                     _all_mirandas,
5854                                                     _super_klass,
5855                                                     _methods,
5856                                                     _access_flags,
5857                                                     _loader_data->class_loader(),
5858                                                     _class_name,
5859                                                     _local_interfaces,
5860                                                     CHECK);
5861 
5862   // Size of Java itable (in words)
5863   _itable_size = _access_flags.is_interface() ? 0 :
5864     klassItable::compute_itable_size(_transitive_interfaces);
5865 
5866   assert(_fac != NULL, "invariant");
5867   assert(_parsed_annotations != NULL, "invariant");
5868 
5869   _field_info = new FieldLayoutInfo();
5870   layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK);
5871 
5872   // Compute reference typ
5873   _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
5874 
5875 }
5876 
5877 void ClassFileParser::set_klass(InstanceKlass* klass) {
5878 
5879 #ifdef ASSERT
5880   if (klass != NULL) {
5881     assert(NULL == _klass, "leaking?");
5882   }
5883 #endif
5884 
5885   _klass = klass;
5886 }
5887 
5888 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5889 
5890 #ifdef ASSERT
5891   if (klass != NULL) {
5892     assert(NULL == _klass_to_deallocate, "leaking?");
5893   }
5894 #endif
5895 
5896   _klass_to_deallocate = klass;
5897 }
5898 
5899 // Caller responsible for ResourceMark
5900 // clone stream with rewound position
5901 const ClassFileStream* ClassFileParser::clone_stream() const {
5902   assert(_stream != NULL, "invariant");
5903 
5904   return _stream->clone();
5905 }