1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_classFileParser.cpp.incl" 27 28 // We generally try to create the oops directly when parsing, rather than 29 // allocating temporary data structures and copying the bytes twice. A 30 // temporary area is only needed when parsing utf8 entries in the constant 31 // pool and when parsing line number tables. 32 33 // We add assert in debug mode when class format is not checked. 34 35 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 36 #define JAVA_MIN_SUPPORTED_VERSION 45 37 #define JAVA_MAX_SUPPORTED_VERSION 51 38 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 39 40 // Used for two backward compatibility reasons: 41 // - to check for new additions to the class file format in JDK1.5 42 // - to check for bug fixes in the format checker in JDK1.5 43 #define JAVA_1_5_VERSION 49 44 45 // Used for backward compatibility reasons: 46 // - to check for javac bug fixes that happened after 1.5 47 // - also used as the max version when running in jdk6 48 #define JAVA_6_VERSION 50 49 50 // Used for backward compatibility reasons: 51 // - to check NameAndType_info signatures more aggressively 52 #define JAVA_7_VERSION 51 53 54 55 void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) { 56 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 57 // this function (_current can be allocated in a register, with scalar 58 // replacement of aggregates). The _current pointer is copied back to 59 // stream() when this function returns. DON'T call another method within 60 // this method that uses stream(). 61 ClassFileStream* cfs0 = stream(); 62 ClassFileStream cfs1 = *cfs0; 63 ClassFileStream* cfs = &cfs1; 64 #ifdef ASSERT 65 u1* old_current = cfs0->current(); 66 #endif 67 68 // Used for batching symbol allocations. 69 const char* names[SymbolTable::symbol_alloc_batch_size]; 70 int lengths[SymbolTable::symbol_alloc_batch_size]; 71 int indices[SymbolTable::symbol_alloc_batch_size]; 72 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 73 int names_count = 0; 74 75 // parsing Index 0 is unused 76 for (int index = 1; index < length; index++) { 77 // Each of the following case guarantees one more byte in the stream 78 // for the following tag or the access_flags following constant pool, 79 // so we don't need bounds-check for reading tag. 80 u1 tag = cfs->get_u1_fast(); 81 switch (tag) { 82 case JVM_CONSTANT_Class : 83 { 84 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 85 u2 name_index = cfs->get_u2_fast(); 86 cp->klass_index_at_put(index, name_index); 87 } 88 break; 89 case JVM_CONSTANT_Fieldref : 90 { 91 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 92 u2 class_index = cfs->get_u2_fast(); 93 u2 name_and_type_index = cfs->get_u2_fast(); 94 cp->field_at_put(index, class_index, name_and_type_index); 95 } 96 break; 97 case JVM_CONSTANT_Methodref : 98 { 99 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 100 u2 class_index = cfs->get_u2_fast(); 101 u2 name_and_type_index = cfs->get_u2_fast(); 102 cp->method_at_put(index, class_index, name_and_type_index); 103 } 104 break; 105 case JVM_CONSTANT_InterfaceMethodref : 106 { 107 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 108 u2 class_index = cfs->get_u2_fast(); 109 u2 name_and_type_index = cfs->get_u2_fast(); 110 cp->interface_method_at_put(index, class_index, name_and_type_index); 111 } 112 break; 113 case JVM_CONSTANT_String : 114 { 115 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 116 u2 string_index = cfs->get_u2_fast(); 117 cp->string_index_at_put(index, string_index); 118 } 119 break; 120 case JVM_CONSTANT_Integer : 121 { 122 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 123 u4 bytes = cfs->get_u4_fast(); 124 cp->int_at_put(index, (jint) bytes); 125 } 126 break; 127 case JVM_CONSTANT_Float : 128 { 129 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 130 u4 bytes = cfs->get_u4_fast(); 131 cp->float_at_put(index, *(jfloat*)&bytes); 132 } 133 break; 134 case JVM_CONSTANT_Long : 135 // A mangled type might cause you to overrun allocated memory 136 guarantee_property(index+1 < length, 137 "Invalid constant pool entry %u in class file %s", 138 index, CHECK); 139 { 140 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 141 u8 bytes = cfs->get_u8_fast(); 142 cp->long_at_put(index, bytes); 143 } 144 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 145 break; 146 case JVM_CONSTANT_Double : 147 // A mangled type might cause you to overrun allocated memory 148 guarantee_property(index+1 < length, 149 "Invalid constant pool entry %u in class file %s", 150 index, CHECK); 151 { 152 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 153 u8 bytes = cfs->get_u8_fast(); 154 cp->double_at_put(index, *(jdouble*)&bytes); 155 } 156 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 157 break; 158 case JVM_CONSTANT_NameAndType : 159 { 160 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 161 u2 name_index = cfs->get_u2_fast(); 162 u2 signature_index = cfs->get_u2_fast(); 163 cp->name_and_type_at_put(index, name_index, signature_index); 164 } 165 break; 166 case JVM_CONSTANT_Utf8 : 167 { 168 cfs->guarantee_more(2, CHECK); // utf8_length 169 u2 utf8_length = cfs->get_u2_fast(); 170 u1* utf8_buffer = cfs->get_u1_buffer(); 171 assert(utf8_buffer != NULL, "null utf8 buffer"); 172 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 173 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 174 cfs->skip_u1_fast(utf8_length); 175 176 // Before storing the symbol, make sure it's legal 177 if (_need_verify) { 178 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 179 } 180 181 if (AnonymousClasses && has_cp_patch_at(index)) { 182 Handle patch = clear_cp_patch_at(index); 183 guarantee_property(java_lang_String::is_instance(patch()), 184 "Illegal utf8 patch at %d in class file %s", 185 index, CHECK); 186 char* str = java_lang_String::as_utf8_string(patch()); 187 // (could use java_lang_String::as_symbol instead, but might as well batch them) 188 utf8_buffer = (u1*) str; 189 utf8_length = (int) strlen(str); 190 } 191 192 unsigned int hash; 193 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 194 if (result == NULL) { 195 names[names_count] = (char*)utf8_buffer; 196 lengths[names_count] = utf8_length; 197 indices[names_count] = index; 198 hashValues[names_count++] = hash; 199 if (names_count == SymbolTable::symbol_alloc_batch_size) { 200 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 201 names_count = 0; 202 } 203 } else { 204 cp->symbol_at_put(index, result); 205 } 206 } 207 break; 208 default: 209 classfile_parse_error( 210 "Unknown constant tag %u in class file %s", tag, CHECK); 211 break; 212 } 213 } 214 215 // Allocate the remaining symbols 216 if (names_count > 0) { 217 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 218 } 219 220 // Copy _current pointer of local copy back to stream(). 221 #ifdef ASSERT 222 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 223 #endif 224 cfs0->set_current(cfs1.current()); 225 } 226 227 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 228 229 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 230 ClassFileStream* cfs = stream(); 231 constantPoolHandle nullHandle; 232 233 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 234 u2 length = cfs->get_u2_fast(); 235 guarantee_property( 236 length >= 1, "Illegal constant pool size %u in class file %s", 237 length, CHECK_(nullHandle)); 238 constantPoolOop constant_pool = 239 oopFactory::new_constantPool(length, 240 methodOopDesc::IsSafeConc, 241 CHECK_(nullHandle)); 242 constantPoolHandle cp (THREAD, constant_pool); 243 244 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops 245 246 // parsing constant pool entries 247 parse_constant_pool_entries(cp, length, CHECK_(nullHandle)); 248 249 int index = 1; // declared outside of loops for portability 250 251 // first verification pass - validate cross references and fixup class and string constants 252 for (index = 1; index < length; index++) { // Index 0 is unused 253 switch (cp->tag_at(index).value()) { 254 case JVM_CONSTANT_Class : 255 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 256 break; 257 case JVM_CONSTANT_Fieldref : 258 // fall through 259 case JVM_CONSTANT_Methodref : 260 // fall through 261 case JVM_CONSTANT_InterfaceMethodref : { 262 if (!_need_verify) break; 263 int klass_ref_index = cp->klass_ref_index_at(index); 264 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 265 check_property(valid_cp_range(klass_ref_index, length) && 266 is_klass_reference(cp, klass_ref_index), 267 "Invalid constant pool index %u in class file %s", 268 klass_ref_index, 269 CHECK_(nullHandle)); 270 check_property(valid_cp_range(name_and_type_ref_index, length) && 271 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 272 "Invalid constant pool index %u in class file %s", 273 name_and_type_ref_index, 274 CHECK_(nullHandle)); 275 break; 276 } 277 case JVM_CONSTANT_String : 278 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 279 break; 280 case JVM_CONSTANT_Integer : 281 break; 282 case JVM_CONSTANT_Float : 283 break; 284 case JVM_CONSTANT_Long : 285 case JVM_CONSTANT_Double : 286 index++; 287 check_property( 288 (index < length && cp->tag_at(index).is_invalid()), 289 "Improper constant pool long/double index %u in class file %s", 290 index, CHECK_(nullHandle)); 291 break; 292 case JVM_CONSTANT_NameAndType : { 293 if (!_need_verify) break; 294 int name_ref_index = cp->name_ref_index_at(index); 295 int signature_ref_index = cp->signature_ref_index_at(index); 296 check_property( 297 valid_cp_range(name_ref_index, length) && 298 cp->tag_at(name_ref_index).is_utf8(), 299 "Invalid constant pool index %u in class file %s", 300 name_ref_index, CHECK_(nullHandle)); 301 check_property( 302 valid_cp_range(signature_ref_index, length) && 303 cp->tag_at(signature_ref_index).is_utf8(), 304 "Invalid constant pool index %u in class file %s", 305 signature_ref_index, CHECK_(nullHandle)); 306 break; 307 } 308 case JVM_CONSTANT_Utf8 : 309 break; 310 case JVM_CONSTANT_UnresolvedClass : // fall-through 311 case JVM_CONSTANT_UnresolvedClassInError: 312 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 313 break; 314 case JVM_CONSTANT_ClassIndex : 315 { 316 int class_index = cp->klass_index_at(index); 317 check_property( 318 valid_cp_range(class_index, length) && 319 cp->tag_at(class_index).is_utf8(), 320 "Invalid constant pool index %u in class file %s", 321 class_index, CHECK_(nullHandle)); 322 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 323 } 324 break; 325 case JVM_CONSTANT_UnresolvedString : 326 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 327 break; 328 case JVM_CONSTANT_StringIndex : 329 { 330 int string_index = cp->string_index_at(index); 331 check_property( 332 valid_cp_range(string_index, length) && 333 cp->tag_at(string_index).is_utf8(), 334 "Invalid constant pool index %u in class file %s", 335 string_index, CHECK_(nullHandle)); 336 symbolOop sym = cp->symbol_at(string_index); 337 cp->unresolved_string_at_put(index, sym); 338 } 339 break; 340 default: 341 fatal(err_msg("bad constant pool tag value %u", 342 cp->tag_at(index).value())); 343 ShouldNotReachHere(); 344 break; 345 } // end of switch 346 } // end of for 347 348 if (_cp_patches != NULL) { 349 // need to treat this_class specially... 350 assert(AnonymousClasses, ""); 351 int this_class_index; 352 { 353 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 354 u1* mark = cfs->current(); 355 u2 flags = cfs->get_u2_fast(); 356 this_class_index = cfs->get_u2_fast(); 357 cfs->set_current(mark); // revert to mark 358 } 359 360 for (index = 1; index < length; index++) { // Index 0 is unused 361 if (has_cp_patch_at(index)) { 362 guarantee_property(index != this_class_index, 363 "Illegal constant pool patch to self at %d in class file %s", 364 index, CHECK_(nullHandle)); 365 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 366 } 367 } 368 // Ensure that all the patches have been used. 369 for (index = 0; index < _cp_patches->length(); index++) { 370 guarantee_property(!has_cp_patch_at(index), 371 "Unused constant pool patch at %d in class file %s", 372 index, CHECK_(nullHandle)); 373 } 374 } 375 376 if (!_need_verify) { 377 return cp; 378 } 379 380 // second verification pass - checks the strings are of the right format. 381 // but not yet to the other entries 382 for (index = 1; index < length; index++) { 383 jbyte tag = cp->tag_at(index).value(); 384 switch (tag) { 385 case JVM_CONSTANT_UnresolvedClass: { 386 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index)); 387 // check the name, even if _cp_patches will overwrite it 388 verify_legal_class_name(class_name, CHECK_(nullHandle)); 389 break; 390 } 391 case JVM_CONSTANT_NameAndType: { 392 if (_need_verify && _major_version >= JAVA_7_VERSION) { 393 int sig_index = cp->signature_ref_index_at(index); 394 int name_index = cp->name_ref_index_at(index); 395 symbolHandle name(THREAD, cp->symbol_at(name_index)); 396 symbolHandle sig(THREAD, cp->symbol_at(sig_index)); 397 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 398 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 399 } else { 400 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 401 } 402 } 403 break; 404 } 405 case JVM_CONSTANT_Fieldref: 406 case JVM_CONSTANT_Methodref: 407 case JVM_CONSTANT_InterfaceMethodref: { 408 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 409 // already verified to be utf8 410 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 411 // already verified to be utf8 412 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 413 symbolHandle name(THREAD, cp->symbol_at(name_ref_index)); 414 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index)); 415 if (tag == JVM_CONSTANT_Fieldref) { 416 verify_legal_field_name(name, CHECK_(nullHandle)); 417 if (_need_verify && _major_version >= JAVA_7_VERSION) { 418 // Signature is verified above, when iterating NameAndType_info. 419 // Need only to be sure it's the right type. 420 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 421 throwIllegalSignature( 422 "Field", name, signature, CHECK_(nullHandle)); 423 } 424 } else { 425 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 426 } 427 } else { 428 verify_legal_method_name(name, CHECK_(nullHandle)); 429 if (_need_verify && _major_version >= JAVA_7_VERSION) { 430 // Signature is verified above, when iterating NameAndType_info. 431 // Need only to be sure it's the right type. 432 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 433 throwIllegalSignature( 434 "Method", name, signature, CHECK_(nullHandle)); 435 } 436 } else { 437 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 438 } 439 if (tag == JVM_CONSTANT_Methodref) { 440 // 4509014: If a class method name begins with '<', it must be "<init>". 441 assert(!name.is_null(), "method name in constant pool is null"); 442 unsigned int name_len = name->utf8_length(); 443 assert(name_len > 0, "bad method name"); // already verified as legal name 444 if (name->byte_at(0) == '<') { 445 if (name() != vmSymbols::object_initializer_name()) { 446 classfile_parse_error( 447 "Bad method name at constant pool index %u in class file %s", 448 name_ref_index, CHECK_(nullHandle)); 449 } 450 } 451 } 452 } 453 break; 454 } 455 } // end of switch 456 } // end of for 457 458 return cp; 459 } 460 461 462 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 463 assert(AnonymousClasses, ""); 464 BasicType patch_type = T_VOID; 465 switch (cp->tag_at(index).value()) { 466 467 case JVM_CONSTANT_UnresolvedClass : 468 // Patching a class means pre-resolving it. 469 // The name in the constant pool is ignored. 470 if (patch->klass() == SystemDictionary::Class_klass()) { // %%% java_lang_Class::is_instance 471 guarantee_property(!java_lang_Class::is_primitive(patch()), 472 "Illegal class patch at %d in class file %s", 473 index, CHECK); 474 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch())); 475 } else { 476 guarantee_property(java_lang_String::is_instance(patch()), 477 "Illegal class patch at %d in class file %s", 478 index, CHECK); 479 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK); 480 cp->unresolved_klass_at_put(index, name()); 481 } 482 break; 483 484 case JVM_CONSTANT_UnresolvedString : 485 // Patching a string means pre-resolving it. 486 // The spelling in the constant pool is ignored. 487 // The constant reference may be any object whatever. 488 // If it is not a real interned string, the constant is referred 489 // to as a "pseudo-string", and must be presented to the CP 490 // explicitly, because it may require scavenging. 491 cp->pseudo_string_at_put(index, patch()); 492 break; 493 494 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 495 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 496 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 497 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 498 patch_prim: 499 { 500 jvalue value; 501 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 502 guarantee_property(value_type == patch_type, 503 "Illegal primitive patch at %d in class file %s", 504 index, CHECK); 505 switch (value_type) { 506 case T_INT: cp->int_at_put(index, value.i); break; 507 case T_FLOAT: cp->float_at_put(index, value.f); break; 508 case T_LONG: cp->long_at_put(index, value.j); break; 509 case T_DOUBLE: cp->double_at_put(index, value.d); break; 510 default: assert(false, ""); 511 } 512 } 513 break; 514 515 default: 516 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 517 guarantee_property(!has_cp_patch_at(index), 518 "Illegal unexpected patch at %d in class file %s", 519 index, CHECK); 520 return; 521 } 522 523 // On fall-through, mark the patch as used. 524 clear_cp_patch_at(index); 525 } 526 527 528 529 class NameSigHash: public ResourceObj { 530 public: 531 symbolOop _name; // name 532 symbolOop _sig; // signature 533 NameSigHash* _next; // Next entry in hash table 534 }; 535 536 537 #define HASH_ROW_SIZE 256 538 539 unsigned int hash(symbolOop name, symbolOop sig) { 540 unsigned int raw_hash = 0; 541 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 542 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 543 544 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 545 } 546 547 548 void initialize_hashtable(NameSigHash** table) { 549 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 550 } 551 552 // Return false if the name/sig combination is found in table. 553 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 554 // The old format checker uses heap sort to find duplicates. 555 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 556 // of table since we don't expect symbolOop's to move. 557 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) { 558 assert(name != NULL, "name in constant pool is NULL"); 559 560 // First lookup for duplicates 561 int index = hash(name, sig); 562 NameSigHash* entry = table[index]; 563 while (entry != NULL) { 564 if (entry->_name == name && entry->_sig == sig) { 565 return false; 566 } 567 entry = entry->_next; 568 } 569 570 // No duplicate is found, allocate a new entry and fill it. 571 entry = new NameSigHash(); 572 entry->_name = name; 573 entry->_sig = sig; 574 575 // Insert into hash table 576 entry->_next = table[index]; 577 table[index] = entry; 578 579 return true; 580 } 581 582 583 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp, 584 int length, 585 Handle class_loader, 586 Handle protection_domain, 587 symbolHandle class_name, 588 TRAPS) { 589 ClassFileStream* cfs = stream(); 590 assert(length > 0, "only called for length>0"); 591 objArrayHandle nullHandle; 592 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 593 objArrayHandle interfaces (THREAD, interface_oop); 594 595 int index; 596 for (index = 0; index < length; index++) { 597 u2 interface_index = cfs->get_u2(CHECK_(nullHandle)); 598 KlassHandle interf; 599 check_property( 600 valid_cp_range(interface_index, cp->length()) && 601 is_klass_reference(cp, interface_index), 602 "Interface name has bad constant pool index %u in class file %s", 603 interface_index, CHECK_(nullHandle)); 604 if (cp->tag_at(interface_index).is_klass()) { 605 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index)); 606 } else { 607 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index)); 608 609 // Don't need to check legal name because it's checked when parsing constant pool. 610 // But need to make sure it's not an array type. 611 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 612 "Bad interface name in class file %s", CHECK_(nullHandle)); 613 614 // Call resolve_super so classcircularity is checked 615 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 616 unresolved_klass, class_loader, protection_domain, 617 false, CHECK_(nullHandle)); 618 interf = KlassHandle(THREAD, k); 619 620 if (LinkWellKnownClasses) // my super type is well known to me 621 cp->klass_at_put(interface_index, interf()); // eagerly resolve 622 } 623 624 if (!Klass::cast(interf())->is_interface()) { 625 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle); 626 } 627 interfaces->obj_at_put(index, interf()); 628 } 629 630 if (!_need_verify || length <= 1) { 631 return interfaces; 632 } 633 634 // Check if there's any duplicates in interfaces 635 ResourceMark rm(THREAD); 636 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 637 THREAD, NameSigHash*, HASH_ROW_SIZE); 638 initialize_hashtable(interface_names); 639 bool dup = false; 640 { 641 debug_only(No_Safepoint_Verifier nsv;) 642 for (index = 0; index < length; index++) { 643 klassOop k = (klassOop)interfaces->obj_at(index); 644 symbolOop name = instanceKlass::cast(k)->name(); 645 // If no duplicates, add (name, NULL) in hashtable interface_names. 646 if (!put_after_lookup(name, NULL, interface_names)) { 647 dup = true; 648 break; 649 } 650 } 651 } 652 if (dup) { 653 classfile_parse_error("Duplicate interface name in class file %s", 654 CHECK_(nullHandle)); 655 } 656 657 return interfaces; 658 } 659 660 661 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) { 662 // Make sure the constant pool entry is of a type appropriate to this field 663 guarantee_property( 664 (constantvalue_index > 0 && 665 constantvalue_index < cp->length()), 666 "Bad initial value index %u in ConstantValue attribute in class file %s", 667 constantvalue_index, CHECK); 668 constantTag value_type = cp->tag_at(constantvalue_index); 669 switch ( cp->basic_type_for_signature_at(signature_index) ) { 670 case T_LONG: 671 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 672 break; 673 case T_FLOAT: 674 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 675 break; 676 case T_DOUBLE: 677 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 678 break; 679 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 680 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 681 break; 682 case T_OBJECT: 683 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 684 && (value_type.is_string() || value_type.is_unresolved_string())), 685 "Bad string initial value in class file %s", CHECK); 686 break; 687 default: 688 classfile_parse_error( 689 "Unable to set initial value %u in class file %s", 690 constantvalue_index, CHECK); 691 } 692 } 693 694 695 // Parse attributes for a field. 696 void ClassFileParser::parse_field_attributes(constantPoolHandle cp, 697 u2 attributes_count, 698 bool is_static, u2 signature_index, 699 u2* constantvalue_index_addr, 700 bool* is_synthetic_addr, 701 u2* generic_signature_index_addr, 702 typeArrayHandle* field_annotations, 703 TRAPS) { 704 ClassFileStream* cfs = stream(); 705 assert(attributes_count > 0, "length should be greater than 0"); 706 u2 constantvalue_index = 0; 707 u2 generic_signature_index = 0; 708 bool is_synthetic = false; 709 u1* runtime_visible_annotations = NULL; 710 int runtime_visible_annotations_length = 0; 711 u1* runtime_invisible_annotations = NULL; 712 int runtime_invisible_annotations_length = 0; 713 while (attributes_count--) { 714 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 715 u2 attribute_name_index = cfs->get_u2_fast(); 716 u4 attribute_length = cfs->get_u4_fast(); 717 check_property(valid_cp_range(attribute_name_index, cp->length()) && 718 cp->tag_at(attribute_name_index).is_utf8(), 719 "Invalid field attribute index %u in class file %s", 720 attribute_name_index, 721 CHECK); 722 symbolOop attribute_name = cp->symbol_at(attribute_name_index); 723 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 724 // ignore if non-static 725 if (constantvalue_index != 0) { 726 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 727 } 728 check_property( 729 attribute_length == 2, 730 "Invalid ConstantValue field attribute length %u in class file %s", 731 attribute_length, CHECK); 732 constantvalue_index = cfs->get_u2(CHECK); 733 if (_need_verify) { 734 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK); 735 } 736 } else if (attribute_name == vmSymbols::tag_synthetic()) { 737 if (attribute_length != 0) { 738 classfile_parse_error( 739 "Invalid Synthetic field attribute length %u in class file %s", 740 attribute_length, CHECK); 741 } 742 is_synthetic = true; 743 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 744 if (attribute_length != 0) { 745 classfile_parse_error( 746 "Invalid Deprecated field attribute length %u in class file %s", 747 attribute_length, CHECK); 748 } 749 } else if (_major_version >= JAVA_1_5_VERSION) { 750 if (attribute_name == vmSymbols::tag_signature()) { 751 if (attribute_length != 2) { 752 classfile_parse_error( 753 "Wrong size %u for field's Signature attribute in class file %s", 754 attribute_length, CHECK); 755 } 756 generic_signature_index = cfs->get_u2(CHECK); 757 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 758 runtime_visible_annotations_length = attribute_length; 759 runtime_visible_annotations = cfs->get_u1_buffer(); 760 assert(runtime_visible_annotations != NULL, "null visible annotations"); 761 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 762 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 763 runtime_invisible_annotations_length = attribute_length; 764 runtime_invisible_annotations = cfs->get_u1_buffer(); 765 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 766 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 767 } else { 768 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 769 } 770 } else { 771 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 772 } 773 } 774 775 *constantvalue_index_addr = constantvalue_index; 776 *is_synthetic_addr = is_synthetic; 777 *generic_signature_index_addr = generic_signature_index; 778 *field_annotations = assemble_annotations(runtime_visible_annotations, 779 runtime_visible_annotations_length, 780 runtime_invisible_annotations, 781 runtime_invisible_annotations_length, 782 CHECK); 783 return; 784 } 785 786 787 // Field allocation types. Used for computing field offsets. 788 789 enum FieldAllocationType { 790 STATIC_OOP, // Oops 791 STATIC_BYTE, // Boolean, Byte, char 792 STATIC_SHORT, // shorts 793 STATIC_WORD, // ints 794 STATIC_DOUBLE, // long or double 795 STATIC_ALIGNED_DOUBLE,// aligned long or double 796 NONSTATIC_OOP, 797 NONSTATIC_BYTE, 798 NONSTATIC_SHORT, 799 NONSTATIC_WORD, 800 NONSTATIC_DOUBLE, 801 NONSTATIC_ALIGNED_DOUBLE 802 }; 803 804 805 struct FieldAllocationCount { 806 unsigned int static_oop_count; 807 unsigned int static_byte_count; 808 unsigned int static_short_count; 809 unsigned int static_word_count; 810 unsigned int static_double_count; 811 unsigned int nonstatic_oop_count; 812 unsigned int nonstatic_byte_count; 813 unsigned int nonstatic_short_count; 814 unsigned int nonstatic_word_count; 815 unsigned int nonstatic_double_count; 816 }; 817 818 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface, 819 struct FieldAllocationCount *fac, 820 objArrayHandle* fields_annotations, TRAPS) { 821 ClassFileStream* cfs = stream(); 822 typeArrayHandle nullHandle; 823 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 824 u2 length = cfs->get_u2_fast(); 825 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index] 826 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle)); 827 typeArrayHandle fields(THREAD, new_fields); 828 829 int index = 0; 830 typeArrayHandle field_annotations; 831 for (int n = 0; n < length; n++) { 832 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 833 834 AccessFlags access_flags; 835 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 836 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle)); 837 access_flags.set_flags(flags); 838 839 u2 name_index = cfs->get_u2_fast(); 840 int cp_size = cp->length(); 841 check_property( 842 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), 843 "Invalid constant pool index %u for field name in class file %s", 844 name_index, CHECK_(nullHandle)); 845 symbolHandle name(THREAD, cp->symbol_at(name_index)); 846 verify_legal_field_name(name, CHECK_(nullHandle)); 847 848 u2 signature_index = cfs->get_u2_fast(); 849 check_property( 850 valid_cp_range(signature_index, cp_size) && 851 cp->tag_at(signature_index).is_utf8(), 852 "Invalid constant pool index %u for field signature in class file %s", 853 signature_index, CHECK_(nullHandle)); 854 symbolHandle sig(THREAD, cp->symbol_at(signature_index)); 855 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 856 857 u2 constantvalue_index = 0; 858 bool is_synthetic = false; 859 u2 generic_signature_index = 0; 860 bool is_static = access_flags.is_static(); 861 862 u2 attributes_count = cfs->get_u2_fast(); 863 if (attributes_count > 0) { 864 parse_field_attributes(cp, attributes_count, is_static, signature_index, 865 &constantvalue_index, &is_synthetic, 866 &generic_signature_index, &field_annotations, 867 CHECK_(nullHandle)); 868 if (field_annotations.not_null()) { 869 if (fields_annotations->is_null()) { 870 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 871 *fields_annotations = objArrayHandle(THREAD, md); 872 } 873 (*fields_annotations)->obj_at_put(n, field_annotations()); 874 } 875 if (is_synthetic) { 876 access_flags.set_is_synthetic(); 877 } 878 } 879 880 fields->short_at_put(index++, access_flags.as_short()); 881 fields->short_at_put(index++, name_index); 882 fields->short_at_put(index++, signature_index); 883 fields->short_at_put(index++, constantvalue_index); 884 885 // Remember how many oops we encountered and compute allocation type 886 BasicType type = cp->basic_type_for_signature_at(signature_index); 887 FieldAllocationType atype; 888 if ( is_static ) { 889 switch ( type ) { 890 case T_BOOLEAN: 891 case T_BYTE: 892 fac->static_byte_count++; 893 atype = STATIC_BYTE; 894 break; 895 case T_LONG: 896 case T_DOUBLE: 897 if (Universe::field_type_should_be_aligned(type)) { 898 atype = STATIC_ALIGNED_DOUBLE; 899 } else { 900 atype = STATIC_DOUBLE; 901 } 902 fac->static_double_count++; 903 break; 904 case T_CHAR: 905 case T_SHORT: 906 fac->static_short_count++; 907 atype = STATIC_SHORT; 908 break; 909 case T_FLOAT: 910 case T_INT: 911 fac->static_word_count++; 912 atype = STATIC_WORD; 913 break; 914 case T_ARRAY: 915 case T_OBJECT: 916 fac->static_oop_count++; 917 atype = STATIC_OOP; 918 break; 919 case T_ADDRESS: 920 case T_VOID: 921 default: 922 assert(0, "bad field type"); 923 } 924 } else { 925 switch ( type ) { 926 case T_BOOLEAN: 927 case T_BYTE: 928 fac->nonstatic_byte_count++; 929 atype = NONSTATIC_BYTE; 930 break; 931 case T_LONG: 932 case T_DOUBLE: 933 if (Universe::field_type_should_be_aligned(type)) { 934 atype = NONSTATIC_ALIGNED_DOUBLE; 935 } else { 936 atype = NONSTATIC_DOUBLE; 937 } 938 fac->nonstatic_double_count++; 939 break; 940 case T_CHAR: 941 case T_SHORT: 942 fac->nonstatic_short_count++; 943 atype = NONSTATIC_SHORT; 944 break; 945 case T_FLOAT: 946 case T_INT: 947 fac->nonstatic_word_count++; 948 atype = NONSTATIC_WORD; 949 break; 950 case T_ARRAY: 951 case T_OBJECT: 952 fac->nonstatic_oop_count++; 953 atype = NONSTATIC_OOP; 954 break; 955 case T_ADDRESS: 956 case T_VOID: 957 default: 958 assert(0, "bad field type"); 959 } 960 } 961 962 // The correct offset is computed later (all oop fields will be located together) 963 // We temporarily store the allocation type in the offset field 964 fields->short_at_put(index++, atype); 965 fields->short_at_put(index++, 0); // Clear out high word of byte offset 966 fields->short_at_put(index++, generic_signature_index); 967 } 968 969 if (_need_verify && length > 1) { 970 // Check duplicated fields 971 ResourceMark rm(THREAD); 972 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 973 THREAD, NameSigHash*, HASH_ROW_SIZE); 974 initialize_hashtable(names_and_sigs); 975 bool dup = false; 976 { 977 debug_only(No_Safepoint_Verifier nsv;) 978 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) { 979 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); 980 symbolOop name = cp->symbol_at(name_index); 981 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); 982 symbolOop sig = cp->symbol_at(sig_index); 983 // If no duplicates, add name/signature in hashtable names_and_sigs. 984 if (!put_after_lookup(name, sig, names_and_sigs)) { 985 dup = true; 986 break; 987 } 988 } 989 } 990 if (dup) { 991 classfile_parse_error("Duplicate field name&signature in class file %s", 992 CHECK_(nullHandle)); 993 } 994 } 995 996 return fields; 997 } 998 999 1000 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1001 while (length-- > 0) { 1002 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1003 } 1004 } 1005 1006 1007 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length, 1008 u4 exception_table_length, 1009 constantPoolHandle cp, 1010 TRAPS) { 1011 ClassFileStream* cfs = stream(); 1012 typeArrayHandle nullHandle; 1013 1014 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index] 1015 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle)); 1016 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh); 1017 1018 int index = 0; 1019 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index 1020 for (unsigned int i = 0; i < exception_table_length; i++) { 1021 u2 start_pc = cfs->get_u2_fast(); 1022 u2 end_pc = cfs->get_u2_fast(); 1023 u2 handler_pc = cfs->get_u2_fast(); 1024 u2 catch_type_index = cfs->get_u2_fast(); 1025 // Will check legal target after parsing code array in verifier. 1026 if (_need_verify) { 1027 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1028 "Illegal exception table range in class file %s", CHECK_(nullHandle)); 1029 guarantee_property(handler_pc < code_length, 1030 "Illegal exception table handler in class file %s", CHECK_(nullHandle)); 1031 if (catch_type_index != 0) { 1032 guarantee_property(valid_cp_range(catch_type_index, cp->length()) && 1033 is_klass_reference(cp, catch_type_index), 1034 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle)); 1035 } 1036 } 1037 exception_handlers->int_at_put(index++, start_pc); 1038 exception_handlers->int_at_put(index++, end_pc); 1039 exception_handlers->int_at_put(index++, handler_pc); 1040 exception_handlers->int_at_put(index++, catch_type_index); 1041 } 1042 return exception_handlers; 1043 } 1044 1045 void ClassFileParser::parse_linenumber_table( 1046 u4 code_attribute_length, u4 code_length, 1047 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1048 ClassFileStream* cfs = stream(); 1049 unsigned int num_entries = cfs->get_u2(CHECK); 1050 1051 // Each entry is a u2 start_pc, and a u2 line_number 1052 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1053 1054 // Verify line number attribute and table length 1055 check_property( 1056 code_attribute_length == sizeof(u2) + length_in_bytes, 1057 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1058 1059 cfs->guarantee_more(length_in_bytes, CHECK); 1060 1061 if ((*write_stream) == NULL) { 1062 if (length_in_bytes > fixed_buffer_size) { 1063 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1064 } else { 1065 (*write_stream) = new CompressedLineNumberWriteStream( 1066 linenumbertable_buffer, fixed_buffer_size); 1067 } 1068 } 1069 1070 while (num_entries-- > 0) { 1071 u2 bci = cfs->get_u2_fast(); // start_pc 1072 u2 line = cfs->get_u2_fast(); // line_number 1073 guarantee_property(bci < code_length, 1074 "Invalid pc in LineNumberTable in class file %s", CHECK); 1075 (*write_stream)->write_pair(bci, line); 1076 } 1077 } 1078 1079 1080 // Class file LocalVariableTable elements. 1081 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1082 public: 1083 u2 start_bci; 1084 u2 length; 1085 u2 name_cp_index; 1086 u2 descriptor_cp_index; 1087 u2 slot; 1088 }; 1089 1090 1091 class LVT_Hash: public CHeapObj { 1092 public: 1093 LocalVariableTableElement *_elem; // element 1094 LVT_Hash* _next; // Next entry in hash table 1095 }; 1096 1097 unsigned int hash(LocalVariableTableElement *elem) { 1098 unsigned int raw_hash = elem->start_bci; 1099 1100 raw_hash = elem->length + raw_hash * 37; 1101 raw_hash = elem->name_cp_index + raw_hash * 37; 1102 raw_hash = elem->slot + raw_hash * 37; 1103 1104 return raw_hash % HASH_ROW_SIZE; 1105 } 1106 1107 void initialize_hashtable(LVT_Hash** table) { 1108 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1109 table[i] = NULL; 1110 } 1111 } 1112 1113 void clear_hashtable(LVT_Hash** table) { 1114 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1115 LVT_Hash* current = table[i]; 1116 LVT_Hash* next; 1117 while (current != NULL) { 1118 next = current->_next; 1119 current->_next = NULL; 1120 delete(current); 1121 current = next; 1122 } 1123 table[i] = NULL; 1124 } 1125 } 1126 1127 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1128 LVT_Hash* entry = table[index]; 1129 1130 /* 1131 * 3-tuple start_bci/length/slot has to be unique key, 1132 * so the following comparison seems to be redundant: 1133 * && elem->name_cp_index == entry->_elem->name_cp_index 1134 */ 1135 while (entry != NULL) { 1136 if (elem->start_bci == entry->_elem->start_bci 1137 && elem->length == entry->_elem->length 1138 && elem->name_cp_index == entry->_elem->name_cp_index 1139 && elem->slot == entry->_elem->slot 1140 ) { 1141 return entry; 1142 } 1143 entry = entry->_next; 1144 } 1145 return NULL; 1146 } 1147 1148 // Return false if the local variable is found in table. 1149 // Return true if no duplicate is found. 1150 // And local variable is added as a new entry in table. 1151 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1152 // First lookup for duplicates 1153 int index = hash(elem); 1154 LVT_Hash* entry = LVT_lookup(elem, index, table); 1155 1156 if (entry != NULL) { 1157 return false; 1158 } 1159 // No duplicate is found, allocate a new entry and fill it. 1160 if ((entry = new LVT_Hash()) == NULL) { 1161 return false; 1162 } 1163 entry->_elem = elem; 1164 1165 // Insert into hash table 1166 entry->_next = table[index]; 1167 table[index] = entry; 1168 1169 return true; 1170 } 1171 1172 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1173 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1174 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1175 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1176 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1177 lvt->signature_cp_index = 0; 1178 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1179 } 1180 1181 // Function is used to parse both attributes: 1182 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1183 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1184 u2 max_locals, 1185 u4 code_attribute_length, 1186 constantPoolHandle cp, 1187 u2* localvariable_table_length, 1188 bool isLVTT, 1189 TRAPS) { 1190 ClassFileStream* cfs = stream(); 1191 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1192 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1193 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1194 // Verify local variable table attribute has right length 1195 if (_need_verify) { 1196 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1197 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1198 } 1199 u2* localvariable_table_start = cfs->get_u2_buffer(); 1200 assert(localvariable_table_start != NULL, "null local variable table"); 1201 if (!_need_verify) { 1202 cfs->skip_u2_fast(size); 1203 } else { 1204 cfs->guarantee_more(size * 2, CHECK_NULL); 1205 for(int i = 0; i < (*localvariable_table_length); i++) { 1206 u2 start_pc = cfs->get_u2_fast(); 1207 u2 length = cfs->get_u2_fast(); 1208 u2 name_index = cfs->get_u2_fast(); 1209 u2 descriptor_index = cfs->get_u2_fast(); 1210 u2 index = cfs->get_u2_fast(); 1211 // Assign to a u4 to avoid overflow 1212 u4 end_pc = (u4)start_pc + (u4)length; 1213 1214 if (start_pc >= code_length) { 1215 classfile_parse_error( 1216 "Invalid start_pc %u in %s in class file %s", 1217 start_pc, tbl_name, CHECK_NULL); 1218 } 1219 if (end_pc > code_length) { 1220 classfile_parse_error( 1221 "Invalid length %u in %s in class file %s", 1222 length, tbl_name, CHECK_NULL); 1223 } 1224 int cp_size = cp->length(); 1225 guarantee_property( 1226 valid_cp_range(name_index, cp_size) && 1227 cp->tag_at(name_index).is_utf8(), 1228 "Name index %u in %s has bad constant type in class file %s", 1229 name_index, tbl_name, CHECK_NULL); 1230 guarantee_property( 1231 valid_cp_range(descriptor_index, cp_size) && 1232 cp->tag_at(descriptor_index).is_utf8(), 1233 "Signature index %u in %s has bad constant type in class file %s", 1234 descriptor_index, tbl_name, CHECK_NULL); 1235 1236 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1237 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index)); 1238 verify_legal_field_name(name, CHECK_NULL); 1239 u2 extra_slot = 0; 1240 if (!isLVTT) { 1241 verify_legal_field_signature(name, sig, CHECK_NULL); 1242 1243 // 4894874: check special cases for double and long local variables 1244 if (sig() == vmSymbols::type_signature(T_DOUBLE) || 1245 sig() == vmSymbols::type_signature(T_LONG)) { 1246 extra_slot = 1; 1247 } 1248 } 1249 guarantee_property((index + extra_slot) < max_locals, 1250 "Invalid index %u in %s in class file %s", 1251 index, tbl_name, CHECK_NULL); 1252 } 1253 } 1254 return localvariable_table_start; 1255 } 1256 1257 1258 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1259 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) { 1260 ClassFileStream* cfs = stream(); 1261 u2 index = 0; // index in the array with long/double occupying two slots 1262 u4 i1 = *u1_index; 1263 u4 i2 = *u2_index + 1; 1264 for(int i = 0; i < array_length; i++) { 1265 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1266 index++; 1267 if (tag == ITEM_Long || tag == ITEM_Double) { 1268 index++; 1269 } else if (tag == ITEM_Object) { 1270 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1271 guarantee_property(valid_cp_range(class_index, cp->length()) && 1272 is_klass_reference(cp, class_index), 1273 "Bad class index %u in StackMap in class file %s", 1274 class_index, CHECK); 1275 } else if (tag == ITEM_Uninitialized) { 1276 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1277 guarantee_property( 1278 offset < code_length, 1279 "Bad uninitialized type offset %u in StackMap in class file %s", 1280 offset, CHECK); 1281 } else { 1282 guarantee_property( 1283 tag <= (u1)ITEM_Uninitialized, 1284 "Unknown variable type %u in StackMap in class file %s", 1285 tag, CHECK); 1286 } 1287 } 1288 u2_array[*u2_index] = index; 1289 *u1_index = i1; 1290 *u2_index = i2; 1291 } 1292 1293 typeArrayOop ClassFileParser::parse_stackmap_table( 1294 u4 code_attribute_length, TRAPS) { 1295 if (code_attribute_length == 0) 1296 return NULL; 1297 1298 ClassFileStream* cfs = stream(); 1299 u1* stackmap_table_start = cfs->get_u1_buffer(); 1300 assert(stackmap_table_start != NULL, "null stackmap table"); 1301 1302 // check code_attribute_length first 1303 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1304 1305 if (!_need_verify && !DumpSharedSpaces) { 1306 return NULL; 1307 } 1308 1309 typeArrayOop stackmap_data = 1310 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL); 1311 1312 stackmap_data->set_length(code_attribute_length); 1313 memcpy((void*)stackmap_data->byte_at_addr(0), 1314 (void*)stackmap_table_start, code_attribute_length); 1315 return stackmap_data; 1316 } 1317 1318 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1319 u4 method_attribute_length, 1320 constantPoolHandle cp, TRAPS) { 1321 ClassFileStream* cfs = stream(); 1322 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1323 *checked_exceptions_length = cfs->get_u2_fast(); 1324 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1325 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1326 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1327 if (!_need_verify) { 1328 cfs->skip_u2_fast(size); 1329 } else { 1330 // Verify each value in the checked exception table 1331 u2 checked_exception; 1332 u2 len = *checked_exceptions_length; 1333 cfs->guarantee_more(2 * len, CHECK_NULL); 1334 for (int i = 0; i < len; i++) { 1335 checked_exception = cfs->get_u2_fast(); 1336 check_property( 1337 valid_cp_range(checked_exception, cp->length()) && 1338 is_klass_reference(cp, checked_exception), 1339 "Exception name has bad type at constant pool %u in class file %s", 1340 checked_exception, CHECK_NULL); 1341 } 1342 } 1343 // check exceptions attribute length 1344 if (_need_verify) { 1345 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1346 sizeof(u2) * size), 1347 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1348 } 1349 return checked_exceptions_start; 1350 } 1351 1352 void ClassFileParser::throwIllegalSignature( 1353 const char* type, symbolHandle name, symbolHandle sig, TRAPS) { 1354 ResourceMark rm(THREAD); 1355 Exceptions::fthrow(THREAD_AND_LOCATION, 1356 vmSymbols::java_lang_ClassFormatError(), 1357 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1358 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1359 } 1360 1361 #define MAX_ARGS_SIZE 255 1362 #define MAX_CODE_SIZE 65535 1363 #define INITIAL_MAX_LVT_NUMBER 256 1364 1365 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1366 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the 1367 // methodOop to save footprint, so we only know the size of the resulting methodOop when the 1368 // entire method attribute is parsed. 1369 // 1370 // The promoted_flags parameter is used to pass relevant access_flags 1371 // from the method back up to the containing klass. These flag values 1372 // are added to klass's access_flags. 1373 1374 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface, 1375 AccessFlags *promoted_flags, 1376 typeArrayHandle* method_annotations, 1377 typeArrayHandle* method_parameter_annotations, 1378 typeArrayHandle* method_default_annotations, 1379 TRAPS) { 1380 ClassFileStream* cfs = stream(); 1381 methodHandle nullHandle; 1382 ResourceMark rm(THREAD); 1383 // Parse fixed parts 1384 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1385 1386 int flags = cfs->get_u2_fast(); 1387 u2 name_index = cfs->get_u2_fast(); 1388 int cp_size = cp->length(); 1389 check_property( 1390 valid_cp_range(name_index, cp_size) && 1391 cp->tag_at(name_index).is_utf8(), 1392 "Illegal constant pool index %u for method name in class file %s", 1393 name_index, CHECK_(nullHandle)); 1394 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1395 verify_legal_method_name(name, CHECK_(nullHandle)); 1396 1397 u2 signature_index = cfs->get_u2_fast(); 1398 guarantee_property( 1399 valid_cp_range(signature_index, cp_size) && 1400 cp->tag_at(signature_index).is_utf8(), 1401 "Illegal constant pool index %u for method signature in class file %s", 1402 signature_index, CHECK_(nullHandle)); 1403 symbolHandle signature(THREAD, cp->symbol_at(signature_index)); 1404 1405 AccessFlags access_flags; 1406 if (name == vmSymbols::class_initializer_name()) { 1407 // We ignore the access flags for a class initializer. (JVM Spec. p. 116) 1408 flags = JVM_ACC_STATIC; 1409 } else { 1410 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 1411 } 1412 1413 int args_size = -1; // only used when _need_verify is true 1414 if (_need_verify) { 1415 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 1416 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 1417 if (args_size > MAX_ARGS_SIZE) { 1418 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 1419 } 1420 } 1421 1422 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 1423 1424 // Default values for code and exceptions attribute elements 1425 u2 max_stack = 0; 1426 u2 max_locals = 0; 1427 u4 code_length = 0; 1428 u1* code_start = 0; 1429 u2 exception_table_length = 0; 1430 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array()); 1431 u2 checked_exceptions_length = 0; 1432 u2* checked_exceptions_start = NULL; 1433 CompressedLineNumberWriteStream* linenumber_table = NULL; 1434 int linenumber_table_length = 0; 1435 int total_lvt_length = 0; 1436 u2 lvt_cnt = 0; 1437 u2 lvtt_cnt = 0; 1438 bool lvt_allocated = false; 1439 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 1440 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 1441 u2* localvariable_table_length; 1442 u2** localvariable_table_start; 1443 u2* localvariable_type_table_length; 1444 u2** localvariable_type_table_start; 1445 bool parsed_code_attribute = false; 1446 bool parsed_checked_exceptions_attribute = false; 1447 bool parsed_stackmap_attribute = false; 1448 // stackmap attribute - JDK1.5 1449 typeArrayHandle stackmap_data; 1450 u2 generic_signature_index = 0; 1451 u1* runtime_visible_annotations = NULL; 1452 int runtime_visible_annotations_length = 0; 1453 u1* runtime_invisible_annotations = NULL; 1454 int runtime_invisible_annotations_length = 0; 1455 u1* runtime_visible_parameter_annotations = NULL; 1456 int runtime_visible_parameter_annotations_length = 0; 1457 u1* runtime_invisible_parameter_annotations = NULL; 1458 int runtime_invisible_parameter_annotations_length = 0; 1459 u1* annotation_default = NULL; 1460 int annotation_default_length = 0; 1461 1462 // Parse code and exceptions attribute 1463 u2 method_attributes_count = cfs->get_u2_fast(); 1464 while (method_attributes_count--) { 1465 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 1466 u2 method_attribute_name_index = cfs->get_u2_fast(); 1467 u4 method_attribute_length = cfs->get_u4_fast(); 1468 check_property( 1469 valid_cp_range(method_attribute_name_index, cp_size) && 1470 cp->tag_at(method_attribute_name_index).is_utf8(), 1471 "Invalid method attribute name index %u in class file %s", 1472 method_attribute_name_index, CHECK_(nullHandle)); 1473 1474 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index); 1475 if (method_attribute_name == vmSymbols::tag_code()) { 1476 // Parse Code attribute 1477 if (_need_verify) { 1478 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(), 1479 "Code attribute in native or abstract methods in class file %s", 1480 CHECK_(nullHandle)); 1481 } 1482 if (parsed_code_attribute) { 1483 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 1484 } 1485 parsed_code_attribute = true; 1486 1487 // Stack size, locals size, and code size 1488 if (_major_version == 45 && _minor_version <= 2) { 1489 cfs->guarantee_more(4, CHECK_(nullHandle)); 1490 max_stack = cfs->get_u1_fast(); 1491 max_locals = cfs->get_u1_fast(); 1492 code_length = cfs->get_u2_fast(); 1493 } else { 1494 cfs->guarantee_more(8, CHECK_(nullHandle)); 1495 max_stack = cfs->get_u2_fast(); 1496 max_locals = cfs->get_u2_fast(); 1497 code_length = cfs->get_u4_fast(); 1498 } 1499 if (_need_verify) { 1500 guarantee_property(args_size <= max_locals, 1501 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 1502 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 1503 "Invalid method Code length %u in class file %s", 1504 code_length, CHECK_(nullHandle)); 1505 } 1506 // Code pointer 1507 code_start = cfs->get_u1_buffer(); 1508 assert(code_start != NULL, "null code start"); 1509 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 1510 cfs->skip_u1_fast(code_length); 1511 1512 // Exception handler table 1513 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 1514 exception_table_length = cfs->get_u2_fast(); 1515 if (exception_table_length > 0) { 1516 exception_handlers = 1517 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle)); 1518 } 1519 1520 // Parse additional attributes in code attribute 1521 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 1522 u2 code_attributes_count = cfs->get_u2_fast(); 1523 1524 unsigned int calculated_attribute_length = 0; 1525 1526 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 1527 calculated_attribute_length = 1528 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 1529 } else { 1530 // max_stack, locals and length are smaller in pre-version 45.2 classes 1531 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 1532 } 1533 calculated_attribute_length += 1534 code_length + 1535 sizeof(exception_table_length) + 1536 sizeof(code_attributes_count) + 1537 exception_table_length * 1538 ( sizeof(u2) + // start_pc 1539 sizeof(u2) + // end_pc 1540 sizeof(u2) + // handler_pc 1541 sizeof(u2) ); // catch_type_index 1542 1543 while (code_attributes_count--) { 1544 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 1545 u2 code_attribute_name_index = cfs->get_u2_fast(); 1546 u4 code_attribute_length = cfs->get_u4_fast(); 1547 calculated_attribute_length += code_attribute_length + 1548 sizeof(code_attribute_name_index) + 1549 sizeof(code_attribute_length); 1550 check_property(valid_cp_range(code_attribute_name_index, cp_size) && 1551 cp->tag_at(code_attribute_name_index).is_utf8(), 1552 "Invalid code attribute name index %u in class file %s", 1553 code_attribute_name_index, 1554 CHECK_(nullHandle)); 1555 if (LoadLineNumberTables && 1556 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 1557 // Parse and compress line number table 1558 parse_linenumber_table(code_attribute_length, code_length, 1559 &linenumber_table, CHECK_(nullHandle)); 1560 1561 } else if (LoadLocalVariableTables && 1562 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 1563 // Parse local variable table 1564 if (!lvt_allocated) { 1565 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1566 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1567 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1568 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1569 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1570 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1571 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1572 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1573 lvt_allocated = true; 1574 } 1575 if (lvt_cnt == max_lvt_cnt) { 1576 max_lvt_cnt <<= 1; 1577 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 1578 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 1579 } 1580 localvariable_table_start[lvt_cnt] = 1581 parse_localvariable_table(code_length, 1582 max_locals, 1583 code_attribute_length, 1584 cp, 1585 &localvariable_table_length[lvt_cnt], 1586 false, // is not LVTT 1587 CHECK_(nullHandle)); 1588 total_lvt_length += localvariable_table_length[lvt_cnt]; 1589 lvt_cnt++; 1590 } else if (LoadLocalVariableTypeTables && 1591 _major_version >= JAVA_1_5_VERSION && 1592 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 1593 if (!lvt_allocated) { 1594 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1595 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1596 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1597 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1598 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1599 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1600 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1601 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1602 lvt_allocated = true; 1603 } 1604 // Parse local variable type table 1605 if (lvtt_cnt == max_lvtt_cnt) { 1606 max_lvtt_cnt <<= 1; 1607 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 1608 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 1609 } 1610 localvariable_type_table_start[lvtt_cnt] = 1611 parse_localvariable_table(code_length, 1612 max_locals, 1613 code_attribute_length, 1614 cp, 1615 &localvariable_type_table_length[lvtt_cnt], 1616 true, // is LVTT 1617 CHECK_(nullHandle)); 1618 lvtt_cnt++; 1619 } else if (UseSplitVerifier && 1620 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 1621 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 1622 // Stack map is only needed by the new verifier in JDK1.5. 1623 if (parsed_stackmap_attribute) { 1624 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 1625 } 1626 typeArrayOop sm = 1627 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 1628 stackmap_data = typeArrayHandle(THREAD, sm); 1629 parsed_stackmap_attribute = true; 1630 } else { 1631 // Skip unknown attributes 1632 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 1633 } 1634 } 1635 // check method attribute length 1636 if (_need_verify) { 1637 guarantee_property(method_attribute_length == calculated_attribute_length, 1638 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 1639 } 1640 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 1641 // Parse Exceptions attribute 1642 if (parsed_checked_exceptions_attribute) { 1643 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 1644 } 1645 parsed_checked_exceptions_attribute = true; 1646 checked_exceptions_start = 1647 parse_checked_exceptions(&checked_exceptions_length, 1648 method_attribute_length, 1649 cp, CHECK_(nullHandle)); 1650 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 1651 if (method_attribute_length != 0) { 1652 classfile_parse_error( 1653 "Invalid Synthetic method attribute length %u in class file %s", 1654 method_attribute_length, CHECK_(nullHandle)); 1655 } 1656 // Should we check that there hasn't already been a synthetic attribute? 1657 access_flags.set_is_synthetic(); 1658 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1659 if (method_attribute_length != 0) { 1660 classfile_parse_error( 1661 "Invalid Deprecated method attribute length %u in class file %s", 1662 method_attribute_length, CHECK_(nullHandle)); 1663 } 1664 } else if (_major_version >= JAVA_1_5_VERSION) { 1665 if (method_attribute_name == vmSymbols::tag_signature()) { 1666 if (method_attribute_length != 2) { 1667 classfile_parse_error( 1668 "Invalid Signature attribute length %u in class file %s", 1669 method_attribute_length, CHECK_(nullHandle)); 1670 } 1671 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 1672 generic_signature_index = cfs->get_u2_fast(); 1673 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1674 runtime_visible_annotations_length = method_attribute_length; 1675 runtime_visible_annotations = cfs->get_u1_buffer(); 1676 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1677 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 1678 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1679 runtime_invisible_annotations_length = method_attribute_length; 1680 runtime_invisible_annotations = cfs->get_u1_buffer(); 1681 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1682 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 1683 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 1684 runtime_visible_parameter_annotations_length = method_attribute_length; 1685 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 1686 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 1687 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 1688 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 1689 runtime_invisible_parameter_annotations_length = method_attribute_length; 1690 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 1691 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 1692 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 1693 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 1694 annotation_default_length = method_attribute_length; 1695 annotation_default = cfs->get_u1_buffer(); 1696 assert(annotation_default != NULL, "null annotation default"); 1697 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 1698 } else { 1699 // Skip unknown attributes 1700 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1701 } 1702 } else { 1703 // Skip unknown attributes 1704 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1705 } 1706 } 1707 1708 if (linenumber_table != NULL) { 1709 linenumber_table->write_terminator(); 1710 linenumber_table_length = linenumber_table->position(); 1711 } 1712 1713 // Make sure there's at least one Code attribute in non-native/non-abstract method 1714 if (_need_verify) { 1715 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 1716 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 1717 } 1718 1719 // All sizing information for a methodOop is finally available, now create it 1720 methodOop m_oop = oopFactory::new_method( 1721 code_length, access_flags, linenumber_table_length, 1722 total_lvt_length, checked_exceptions_length, 1723 methodOopDesc::IsSafeConc, CHECK_(nullHandle)); 1724 methodHandle m (THREAD, m_oop); 1725 1726 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize); 1727 1728 // Fill in information from fixed part (access_flags already set) 1729 m->set_constants(cp()); 1730 m->set_name_index(name_index); 1731 m->set_signature_index(signature_index); 1732 m->set_generic_signature_index(generic_signature_index); 1733 #ifdef CC_INTERP 1734 // hmm is there a gc issue here?? 1735 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 1736 m->set_result_index(rtf.type()); 1737 #endif 1738 1739 if (args_size >= 0) { 1740 m->set_size_of_parameters(args_size); 1741 } else { 1742 m->compute_size_of_parameters(THREAD); 1743 } 1744 #ifdef ASSERT 1745 if (args_size >= 0) { 1746 m->compute_size_of_parameters(THREAD); 1747 assert(args_size == m->size_of_parameters(), ""); 1748 } 1749 #endif 1750 1751 // Fill in code attribute information 1752 m->set_max_stack(max_stack); 1753 m->set_max_locals(max_locals); 1754 m->constMethod()->set_stackmap_data(stackmap_data()); 1755 1756 /** 1757 * The exception_table field is the flag used to indicate 1758 * that the methodOop and it's associated constMethodOop are partially 1759 * initialized and thus are exempt from pre/post GC verification. Once 1760 * the field is set, the oops are considered fully initialized so make 1761 * sure that the oops can pass verification when this field is set. 1762 */ 1763 m->set_exception_table(exception_handlers()); 1764 1765 // Copy byte codes 1766 m->set_code(code_start); 1767 1768 // Copy line number table 1769 if (linenumber_table != NULL) { 1770 memcpy(m->compressed_linenumber_table(), 1771 linenumber_table->buffer(), linenumber_table_length); 1772 } 1773 1774 // Copy checked exceptions 1775 if (checked_exceptions_length > 0) { 1776 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 1777 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 1778 } 1779 1780 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1781 * 1782 * Rules for LVT's and LVTT's are: 1783 * - There can be any number of LVT's and LVTT's. 1784 * - If there are n LVT's, it is the same as if there was just 1785 * one LVT containing all the entries from the n LVT's. 1786 * - There may be no more than one LVT entry per local variable. 1787 * Two LVT entries are 'equal' if these fields are the same: 1788 * start_pc, length, name, slot 1789 * - There may be no more than one LVTT entry per each LVT entry. 1790 * Each LVTT entry has to match some LVT entry. 1791 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1792 */ 1793 if (total_lvt_length > 0) { 1794 int tbl_no, idx; 1795 1796 promoted_flags->set_has_localvariable_table(); 1797 1798 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1799 initialize_hashtable(lvt_Hash); 1800 1801 // To fill LocalVariableTable in 1802 Classfile_LVT_Element* cf_lvt; 1803 LocalVariableTableElement* lvt = m->localvariable_table_start(); 1804 1805 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1806 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1807 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1808 copy_lvt_element(&cf_lvt[idx], lvt); 1809 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1810 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1811 && _need_verify 1812 && _major_version >= JAVA_1_5_VERSION ) { 1813 clear_hashtable(lvt_Hash); 1814 classfile_parse_error("Duplicated LocalVariableTable attribute " 1815 "entry for '%s' in class file %s", 1816 cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1817 CHECK_(nullHandle)); 1818 } 1819 } 1820 } 1821 1822 // To merge LocalVariableTable and LocalVariableTypeTable 1823 Classfile_LVT_Element* cf_lvtt; 1824 LocalVariableTableElement lvtt_elem; 1825 1826 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1827 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1828 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1829 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1830 int index = hash(&lvtt_elem); 1831 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1832 if (entry == NULL) { 1833 if (_need_verify) { 1834 clear_hashtable(lvt_Hash); 1835 classfile_parse_error("LVTT entry for '%s' in class file %s " 1836 "does not match any LVT entry", 1837 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1838 CHECK_(nullHandle)); 1839 } 1840 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1841 clear_hashtable(lvt_Hash); 1842 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1843 "entry for '%s' in class file %s", 1844 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1845 CHECK_(nullHandle)); 1846 } else { 1847 // to add generic signatures into LocalVariableTable 1848 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1849 } 1850 } 1851 } 1852 clear_hashtable(lvt_Hash); 1853 } 1854 1855 *method_annotations = assemble_annotations(runtime_visible_annotations, 1856 runtime_visible_annotations_length, 1857 runtime_invisible_annotations, 1858 runtime_invisible_annotations_length, 1859 CHECK_(nullHandle)); 1860 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations, 1861 runtime_visible_parameter_annotations_length, 1862 runtime_invisible_parameter_annotations, 1863 runtime_invisible_parameter_annotations_length, 1864 CHECK_(nullHandle)); 1865 *method_default_annotations = assemble_annotations(annotation_default, 1866 annotation_default_length, 1867 NULL, 1868 0, 1869 CHECK_(nullHandle)); 1870 1871 if (name() == vmSymbols::finalize_method_name() && 1872 signature() == vmSymbols::void_method_signature()) { 1873 if (m->is_empty_method()) { 1874 _has_empty_finalizer = true; 1875 } else { 1876 _has_finalizer = true; 1877 } 1878 } 1879 if (name() == vmSymbols::object_initializer_name() && 1880 signature() == vmSymbols::void_method_signature() && 1881 m->is_vanilla_constructor()) { 1882 _has_vanilla_constructor = true; 1883 } 1884 1885 if (EnableMethodHandles && (m->is_method_handle_invoke() || 1886 m->is_method_handle_adapter())) { 1887 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(), 1888 "Method handle invokers must be defined internally to the VM", nullHandle); 1889 } 1890 1891 return m; 1892 } 1893 1894 1895 // The promoted_flags parameter is used to pass relevant access_flags 1896 // from the methods back up to the containing klass. These flag values 1897 // are added to klass's access_flags. 1898 1899 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface, 1900 AccessFlags* promoted_flags, 1901 bool* has_final_method, 1902 objArrayOop* methods_annotations_oop, 1903 objArrayOop* methods_parameter_annotations_oop, 1904 objArrayOop* methods_default_annotations_oop, 1905 TRAPS) { 1906 ClassFileStream* cfs = stream(); 1907 objArrayHandle nullHandle; 1908 typeArrayHandle method_annotations; 1909 typeArrayHandle method_parameter_annotations; 1910 typeArrayHandle method_default_annotations; 1911 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 1912 u2 length = cfs->get_u2_fast(); 1913 if (length == 0) { 1914 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 1915 } else { 1916 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1917 objArrayHandle methods(THREAD, m); 1918 HandleMark hm(THREAD); 1919 objArrayHandle methods_annotations; 1920 objArrayHandle methods_parameter_annotations; 1921 objArrayHandle methods_default_annotations; 1922 for (int index = 0; index < length; index++) { 1923 methodHandle method = parse_method(cp, is_interface, 1924 promoted_flags, 1925 &method_annotations, 1926 &method_parameter_annotations, 1927 &method_default_annotations, 1928 CHECK_(nullHandle)); 1929 if (method->is_final()) { 1930 *has_final_method = true; 1931 } 1932 methods->obj_at_put(index, method()); 1933 if (method_annotations.not_null()) { 1934 if (methods_annotations.is_null()) { 1935 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1936 methods_annotations = objArrayHandle(THREAD, md); 1937 } 1938 methods_annotations->obj_at_put(index, method_annotations()); 1939 } 1940 if (method_parameter_annotations.not_null()) { 1941 if (methods_parameter_annotations.is_null()) { 1942 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1943 methods_parameter_annotations = objArrayHandle(THREAD, md); 1944 } 1945 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations()); 1946 } 1947 if (method_default_annotations.not_null()) { 1948 if (methods_default_annotations.is_null()) { 1949 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1950 methods_default_annotations = objArrayHandle(THREAD, md); 1951 } 1952 methods_default_annotations->obj_at_put(index, method_default_annotations()); 1953 } 1954 } 1955 if (_need_verify && length > 1) { 1956 // Check duplicated methods 1957 ResourceMark rm(THREAD); 1958 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1959 THREAD, NameSigHash*, HASH_ROW_SIZE); 1960 initialize_hashtable(names_and_sigs); 1961 bool dup = false; 1962 { 1963 debug_only(No_Safepoint_Verifier nsv;) 1964 for (int i = 0; i < length; i++) { 1965 methodOop m = (methodOop)methods->obj_at(i); 1966 // If no duplicates, add name/signature in hashtable names_and_sigs. 1967 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 1968 dup = true; 1969 break; 1970 } 1971 } 1972 } 1973 if (dup) { 1974 classfile_parse_error("Duplicate method name&signature in class file %s", 1975 CHECK_(nullHandle)); 1976 } 1977 } 1978 1979 *methods_annotations_oop = methods_annotations(); 1980 *methods_parameter_annotations_oop = methods_parameter_annotations(); 1981 *methods_default_annotations_oop = methods_default_annotations(); 1982 1983 return methods; 1984 } 1985 } 1986 1987 1988 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods, 1989 objArrayHandle methods_annotations, 1990 objArrayHandle methods_parameter_annotations, 1991 objArrayHandle methods_default_annotations, 1992 TRAPS) { 1993 typeArrayHandle nullHandle; 1994 int length = methods()->length(); 1995 // If JVMTI original method ordering is enabled we have to 1996 // remember the original class file ordering. 1997 // We temporarily use the vtable_index field in the methodOop to store the 1998 // class file index, so we can read in after calling qsort. 1999 if (JvmtiExport::can_maintain_original_method_order()) { 2000 for (int index = 0; index < length; index++) { 2001 methodOop m = methodOop(methods->obj_at(index)); 2002 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2003 m->set_vtable_index(index); 2004 } 2005 } 2006 // Sort method array by ascending method name (for faster lookups & vtable construction) 2007 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare 2008 methodOopDesc::sort_methods(methods(), 2009 methods_annotations(), 2010 methods_parameter_annotations(), 2011 methods_default_annotations()); 2012 2013 // If JVMTI original method ordering is enabled construct int array remembering the original ordering 2014 if (JvmtiExport::can_maintain_original_method_order()) { 2015 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle)); 2016 typeArrayHandle method_ordering(THREAD, new_ordering); 2017 for (int index = 0; index < length; index++) { 2018 methodOop m = methodOop(methods->obj_at(index)); 2019 int old_index = m->vtable_index(); 2020 assert(old_index >= 0 && old_index < length, "invalid method index"); 2021 method_ordering->int_at_put(index, old_index); 2022 m->set_vtable_index(methodOopDesc::invalid_vtable_index); 2023 } 2024 return method_ordering; 2025 } else { 2026 return typeArrayHandle(THREAD, Universe::the_empty_int_array()); 2027 } 2028 } 2029 2030 2031 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2032 ClassFileStream* cfs = stream(); 2033 cfs->guarantee_more(2, CHECK); // sourcefile_index 2034 u2 sourcefile_index = cfs->get_u2_fast(); 2035 check_property( 2036 valid_cp_range(sourcefile_index, cp->length()) && 2037 cp->tag_at(sourcefile_index).is_utf8(), 2038 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2039 sourcefile_index, CHECK); 2040 k->set_source_file_name(cp->symbol_at(sourcefile_index)); 2041 } 2042 2043 2044 2045 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp, 2046 instanceKlassHandle k, 2047 int length, TRAPS) { 2048 ClassFileStream* cfs = stream(); 2049 u1* sde_buffer = cfs->get_u1_buffer(); 2050 assert(sde_buffer != NULL, "null sde buffer"); 2051 2052 // Don't bother storing it if there is no way to retrieve it 2053 if (JvmtiExport::can_get_source_debug_extension()) { 2054 // Optimistically assume that only 1 byte UTF format is used 2055 // (common case) 2056 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer, 2057 length, CHECK); 2058 k->set_source_debug_extension(sde_symbol); 2059 } 2060 // Got utf8 string, set stream position forward 2061 cfs->skip_u1(length, CHECK); 2062 } 2063 2064 2065 // Inner classes can be static, private or protected (classic VM does this) 2066 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2067 2068 // Return number of classes in the inner classes attribute table 2069 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2070 ClassFileStream* cfs = stream(); 2071 cfs->guarantee_more(2, CHECK_0); // length 2072 u2 length = cfs->get_u2_fast(); 2073 2074 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags] 2075 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0); 2076 typeArrayHandle inner_classes(THREAD, ic); 2077 int index = 0; 2078 int cp_size = cp->length(); 2079 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2080 for (int n = 0; n < length; n++) { 2081 // Inner class index 2082 u2 inner_class_info_index = cfs->get_u2_fast(); 2083 check_property( 2084 inner_class_info_index == 0 || 2085 (valid_cp_range(inner_class_info_index, cp_size) && 2086 is_klass_reference(cp, inner_class_info_index)), 2087 "inner_class_info_index %u has bad constant type in class file %s", 2088 inner_class_info_index, CHECK_0); 2089 // Outer class index 2090 u2 outer_class_info_index = cfs->get_u2_fast(); 2091 check_property( 2092 outer_class_info_index == 0 || 2093 (valid_cp_range(outer_class_info_index, cp_size) && 2094 is_klass_reference(cp, outer_class_info_index)), 2095 "outer_class_info_index %u has bad constant type in class file %s", 2096 outer_class_info_index, CHECK_0); 2097 // Inner class name 2098 u2 inner_name_index = cfs->get_u2_fast(); 2099 check_property( 2100 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) && 2101 cp->tag_at(inner_name_index).is_utf8()), 2102 "inner_name_index %u has bad constant type in class file %s", 2103 inner_name_index, CHECK_0); 2104 if (_need_verify) { 2105 guarantee_property(inner_class_info_index != outer_class_info_index, 2106 "Class is both outer and inner class in class file %s", CHECK_0); 2107 } 2108 // Access flags 2109 AccessFlags inner_access_flags; 2110 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2111 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2112 // Set abstract bit for old class files for backward compatibility 2113 flags |= JVM_ACC_ABSTRACT; 2114 } 2115 verify_legal_class_modifiers(flags, CHECK_0); 2116 inner_access_flags.set_flags(flags); 2117 2118 inner_classes->short_at_put(index++, inner_class_info_index); 2119 inner_classes->short_at_put(index++, outer_class_info_index); 2120 inner_classes->short_at_put(index++, inner_name_index); 2121 inner_classes->short_at_put(index++, inner_access_flags.as_short()); 2122 } 2123 2124 // 4347400: make sure there's no duplicate entry in the classes array 2125 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2126 for(int i = 0; i < inner_classes->length(); i += 4) { 2127 for(int j = i + 4; j < inner_classes->length(); j += 4) { 2128 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) || 2129 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) || 2130 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) || 2131 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)), 2132 "Duplicate entry in InnerClasses in class file %s", 2133 CHECK_0); 2134 } 2135 } 2136 } 2137 2138 // Update instanceKlass with inner class info. 2139 k->set_inner_classes(inner_classes()); 2140 return length; 2141 } 2142 2143 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2144 k->set_is_synthetic(); 2145 } 2146 2147 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2148 ClassFileStream* cfs = stream(); 2149 u2 signature_index = cfs->get_u2(CHECK); 2150 check_property( 2151 valid_cp_range(signature_index, cp->length()) && 2152 cp->tag_at(signature_index).is_utf8(), 2153 "Invalid constant pool index %u in Signature attribute in class file %s", 2154 signature_index, CHECK); 2155 k->set_generic_signature(cp->symbol_at(signature_index)); 2156 } 2157 2158 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2159 ClassFileStream* cfs = stream(); 2160 // Set inner classes attribute to default sentinel 2161 k->set_inner_classes(Universe::the_empty_short_array()); 2162 cfs->guarantee_more(2, CHECK); // attributes_count 2163 u2 attributes_count = cfs->get_u2_fast(); 2164 bool parsed_sourcefile_attribute = false; 2165 bool parsed_innerclasses_attribute = false; 2166 bool parsed_enclosingmethod_attribute = false; 2167 u1* runtime_visible_annotations = NULL; 2168 int runtime_visible_annotations_length = 0; 2169 u1* runtime_invisible_annotations = NULL; 2170 int runtime_invisible_annotations_length = 0; 2171 // Iterate over attributes 2172 while (attributes_count--) { 2173 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2174 u2 attribute_name_index = cfs->get_u2_fast(); 2175 u4 attribute_length = cfs->get_u4_fast(); 2176 check_property( 2177 valid_cp_range(attribute_name_index, cp->length()) && 2178 cp->tag_at(attribute_name_index).is_utf8(), 2179 "Attribute name has bad constant pool index %u in class file %s", 2180 attribute_name_index, CHECK); 2181 symbolOop tag = cp->symbol_at(attribute_name_index); 2182 if (tag == vmSymbols::tag_source_file()) { 2183 // Check for SourceFile tag 2184 if (_need_verify) { 2185 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2186 } 2187 if (parsed_sourcefile_attribute) { 2188 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2189 } else { 2190 parsed_sourcefile_attribute = true; 2191 } 2192 parse_classfile_sourcefile_attribute(cp, k, CHECK); 2193 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2194 // Check for SourceDebugExtension tag 2195 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK); 2196 } else if (tag == vmSymbols::tag_inner_classes()) { 2197 // Check for InnerClasses tag 2198 if (parsed_innerclasses_attribute) { 2199 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2200 } else { 2201 parsed_innerclasses_attribute = true; 2202 } 2203 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK); 2204 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2205 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2206 "Wrong InnerClasses attribute length in class file %s", CHECK); 2207 } 2208 } else if (tag == vmSymbols::tag_synthetic()) { 2209 // Check for Synthetic tag 2210 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2211 if (attribute_length != 0) { 2212 classfile_parse_error( 2213 "Invalid Synthetic classfile attribute length %u in class file %s", 2214 attribute_length, CHECK); 2215 } 2216 parse_classfile_synthetic_attribute(cp, k, CHECK); 2217 } else if (tag == vmSymbols::tag_deprecated()) { 2218 // Check for Deprecatd tag - 4276120 2219 if (attribute_length != 0) { 2220 classfile_parse_error( 2221 "Invalid Deprecated classfile attribute length %u in class file %s", 2222 attribute_length, CHECK); 2223 } 2224 } else if (_major_version >= JAVA_1_5_VERSION) { 2225 if (tag == vmSymbols::tag_signature()) { 2226 if (attribute_length != 2) { 2227 classfile_parse_error( 2228 "Wrong Signature attribute length %u in class file %s", 2229 attribute_length, CHECK); 2230 } 2231 parse_classfile_signature_attribute(cp, k, CHECK); 2232 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2233 runtime_visible_annotations_length = attribute_length; 2234 runtime_visible_annotations = cfs->get_u1_buffer(); 2235 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2236 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2237 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2238 runtime_invisible_annotations_length = attribute_length; 2239 runtime_invisible_annotations = cfs->get_u1_buffer(); 2240 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2241 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2242 } else if (tag == vmSymbols::tag_enclosing_method()) { 2243 if (parsed_enclosingmethod_attribute) { 2244 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2245 } else { 2246 parsed_enclosingmethod_attribute = true; 2247 } 2248 cfs->guarantee_more(4, CHECK); // class_index, method_index 2249 u2 class_index = cfs->get_u2_fast(); 2250 u2 method_index = cfs->get_u2_fast(); 2251 if (class_index == 0) { 2252 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2253 } 2254 // Validate the constant pool indices and types 2255 if (!cp->is_within_bounds(class_index) || 2256 !is_klass_reference(cp, class_index)) { 2257 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2258 } 2259 if (method_index != 0 && 2260 (!cp->is_within_bounds(method_index) || 2261 !cp->tag_at(method_index).is_name_and_type())) { 2262 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2263 } 2264 k->set_enclosing_method_indices(class_index, method_index); 2265 } else { 2266 // Unknown attribute 2267 cfs->skip_u1(attribute_length, CHECK); 2268 } 2269 } else { 2270 // Unknown attribute 2271 cfs->skip_u1(attribute_length, CHECK); 2272 } 2273 } 2274 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations, 2275 runtime_visible_annotations_length, 2276 runtime_invisible_annotations, 2277 runtime_invisible_annotations_length, 2278 CHECK); 2279 k->set_class_annotations(annotations()); 2280 } 2281 2282 2283 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 2284 int runtime_visible_annotations_length, 2285 u1* runtime_invisible_annotations, 2286 int runtime_invisible_annotations_length, TRAPS) { 2287 typeArrayHandle annotations; 2288 if (runtime_visible_annotations != NULL || 2289 runtime_invisible_annotations != NULL) { 2290 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length + 2291 runtime_invisible_annotations_length, CHECK_(annotations)); 2292 annotations = typeArrayHandle(THREAD, anno); 2293 if (runtime_visible_annotations != NULL) { 2294 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length); 2295 } 2296 if (runtime_invisible_annotations != NULL) { 2297 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length); 2298 } 2299 } 2300 return annotations; 2301 } 2302 2303 2304 static void initialize_static_field(fieldDescriptor* fd, TRAPS) { 2305 KlassHandle h_k (THREAD, fd->field_holder()); 2306 assert(h_k.not_null() && fd->is_static(), "just checking"); 2307 if (fd->has_initial_value()) { 2308 BasicType t = fd->field_type(); 2309 switch (t) { 2310 case T_BYTE: 2311 h_k()->byte_field_put(fd->offset(), fd->int_initial_value()); 2312 break; 2313 case T_BOOLEAN: 2314 h_k()->bool_field_put(fd->offset(), fd->int_initial_value()); 2315 break; 2316 case T_CHAR: 2317 h_k()->char_field_put(fd->offset(), fd->int_initial_value()); 2318 break; 2319 case T_SHORT: 2320 h_k()->short_field_put(fd->offset(), fd->int_initial_value()); 2321 break; 2322 case T_INT: 2323 h_k()->int_field_put(fd->offset(), fd->int_initial_value()); 2324 break; 2325 case T_FLOAT: 2326 h_k()->float_field_put(fd->offset(), fd->float_initial_value()); 2327 break; 2328 case T_DOUBLE: 2329 h_k()->double_field_put(fd->offset(), fd->double_initial_value()); 2330 break; 2331 case T_LONG: 2332 h_k()->long_field_put(fd->offset(), fd->long_initial_value()); 2333 break; 2334 case T_OBJECT: 2335 { 2336 #ifdef ASSERT 2337 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK); 2338 assert(fd->signature() == sym, "just checking"); 2339 #endif 2340 oop string = fd->string_initial_value(CHECK); 2341 h_k()->obj_field_put(fd->offset(), string); 2342 } 2343 break; 2344 default: 2345 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 2346 "Illegal ConstantValue attribute in class file"); 2347 } 2348 } 2349 } 2350 2351 2352 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr, 2353 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) { 2354 // This code is for compatibility with earlier jdk's that do not 2355 // have the "discovered" field in java.lang.ref.Reference. For 1.5 2356 // the check for the "discovered" field should issue a warning if 2357 // the field is not found. For 1.6 this code should be issue a 2358 // fatal error if the "discovered" field is not found. 2359 // 2360 // Increment fac.nonstatic_oop_count so that the start of the 2361 // next type of non-static oops leaves room for the fake oop. 2362 // Do not increment next_nonstatic_oop_offset so that the 2363 // fake oop is place after the java.lang.ref.Reference oop 2364 // fields. 2365 // 2366 // Check the fields in java.lang.ref.Reference for the "discovered" 2367 // field. If it is not present, artifically create a field for it. 2368 // This allows this VM to run on early JDK where the field is not 2369 // present. 2370 2371 // 2372 // Increment fac.nonstatic_oop_count so that the start of the 2373 // next type of non-static oops leaves room for the fake oop. 2374 // Do not increment next_nonstatic_oop_offset so that the 2375 // fake oop is place after the java.lang.ref.Reference oop 2376 // fields. 2377 // 2378 // Check the fields in java.lang.ref.Reference for the "discovered" 2379 // field. If it is not present, artifically create a field for it. 2380 // This allows this VM to run on early JDK where the field is not 2381 // present. 2382 int reference_sig_index = 0; 2383 int reference_name_index = 0; 2384 int reference_index = 0; 2385 int extra = java_lang_ref_Reference::number_of_fake_oop_fields; 2386 const int n = (*fields_ptr)()->length(); 2387 for (int i = 0; i < n; i += instanceKlass::next_offset ) { 2388 int name_index = 2389 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset); 2390 int sig_index = 2391 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset); 2392 symbolOop f_name = cp->symbol_at(name_index); 2393 symbolOop f_sig = cp->symbol_at(sig_index); 2394 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) { 2395 // Save the index for reference signature for later use. 2396 // The fake discovered field does not entries in the 2397 // constant pool so the index for its signature cannot 2398 // be extracted from the constant pool. It will need 2399 // later, however. It's signature is vmSymbols::reference_signature() 2400 // so same an index for that signature. 2401 reference_sig_index = sig_index; 2402 reference_name_index = name_index; 2403 reference_index = i; 2404 } 2405 if (f_name == vmSymbols::reference_discovered_name() && 2406 f_sig == vmSymbols::reference_signature()) { 2407 // The values below are fake but will force extra 2408 // non-static oop fields and a corresponding non-static 2409 // oop map block to be allocated. 2410 extra = 0; 2411 break; 2412 } 2413 } 2414 if (extra != 0) { 2415 fac_ptr->nonstatic_oop_count += extra; 2416 // Add the additional entry to "fields" so that the klass 2417 // contains the "discoverd" field and the field will be initialized 2418 // in instances of the object. 2419 int fields_with_fix_length = (*fields_ptr)()->length() + 2420 instanceKlass::next_offset; 2421 typeArrayOop ff = oopFactory::new_permanent_shortArray( 2422 fields_with_fix_length, CHECK); 2423 typeArrayHandle fields_with_fix(THREAD, ff); 2424 2425 // Take everything from the original but the length. 2426 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) { 2427 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx)); 2428 } 2429 2430 // Add the fake field at the end. 2431 int i = (*fields_ptr)->length(); 2432 // There is no name index for the fake "discovered" field nor 2433 // signature but a signature is needed so that the field will 2434 // be properly initialized. Use one found for 2435 // one of the other reference fields. Be sure the index for the 2436 // name is 0. In fieldDescriptor::initialize() the index of the 2437 // name is checked. That check is by passed for the last nonstatic 2438 // oop field in a java.lang.ref.Reference which is assumed to be 2439 // this artificial "discovered" field. An assertion checks that 2440 // the name index is 0. 2441 assert(reference_index != 0, "Missing signature for reference"); 2442 2443 int j; 2444 for (j = 0; j < instanceKlass::next_offset; j++) { 2445 fields_with_fix->ushort_at_put(i + j, 2446 (*fields_ptr)->ushort_at(reference_index +j)); 2447 } 2448 // Clear the public access flag and set the private access flag. 2449 short flags; 2450 flags = 2451 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset); 2452 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set"); 2453 flags = flags & (~JVM_ACC_PUBLIC); 2454 flags = flags | JVM_ACC_PRIVATE; 2455 AccessFlags access_flags; 2456 access_flags.set_flags(flags); 2457 assert(!access_flags.is_public(), "Failed to clear public flag"); 2458 assert(access_flags.is_private(), "Failed to set private flag"); 2459 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset, 2460 flags); 2461 2462 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset) 2463 == reference_name_index, "The fake reference name is incorrect"); 2464 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset) 2465 == reference_sig_index, "The fake reference signature is incorrect"); 2466 // The type of the field is stored in the low_offset entry during 2467 // parsing. 2468 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) == 2469 NONSTATIC_OOP, "The fake reference type is incorrect"); 2470 2471 // "fields" is allocated in the permanent generation. Disgard 2472 // it and let it be collected. 2473 (*fields_ptr) = fields_with_fix; 2474 } 2475 return; 2476 } 2477 2478 2479 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr, 2480 FieldAllocationCount *fac_ptr, TRAPS) { 2481 // Add fake fields for java.lang.Class instances 2482 // 2483 // This is not particularly nice. We should consider adding a 2484 // private transient object field at the Java level to 2485 // java.lang.Class. Alternatively we could add a subclass of 2486 // instanceKlass which provides an accessor and size computer for 2487 // this field, but that appears to be more code than this hack. 2488 // 2489 // NOTE that we wedge these in at the beginning rather than the 2490 // end of the object because the Class layout changed between JDK 2491 // 1.3 and JDK 1.4 with the new reflection implementation; some 2492 // nonstatic oop fields were added at the Java level. The offsets 2493 // of these fake fields can't change between these two JDK 2494 // versions because when the offsets are computed at bootstrap 2495 // time we don't know yet which version of the JDK we're running in. 2496 2497 // The values below are fake but will force two non-static oop fields and 2498 // a corresponding non-static oop map block to be allocated. 2499 const int extra = java_lang_Class::number_of_fake_oop_fields; 2500 fac_ptr->nonstatic_oop_count += extra; 2501 } 2502 2503 2504 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) { 2505 // Cause the extra fake fields in java.lang.Class to show up before 2506 // the Java fields for layout compatibility between 1.3 and 1.4 2507 // Incrementing next_nonstatic_oop_offset here advances the 2508 // location where the real java fields are placed. 2509 const int extra = java_lang_Class::number_of_fake_oop_fields; 2510 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize); 2511 } 2512 2513 2514 // Force MethodHandle.vmentry to be an unmanaged pointer. 2515 // There is no way for a classfile to express this, so we must help it. 2516 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp, 2517 typeArrayHandle* fields_ptr, 2518 FieldAllocationCount *fac_ptr, 2519 TRAPS) { 2520 // Add fake fields for java.dyn.MethodHandle instances 2521 // 2522 // This is not particularly nice, but since there is no way to express 2523 // a native wordSize field in Java, we must do it at this level. 2524 2525 if (!EnableMethodHandles) return; 2526 2527 int word_sig_index = 0; 2528 const int cp_size = cp->length(); 2529 for (int index = 1; index < cp_size; index++) { 2530 if (cp->tag_at(index).is_utf8() && 2531 cp->symbol_at(index) == vmSymbols::machine_word_signature()) { 2532 word_sig_index = index; 2533 break; 2534 } 2535 } 2536 2537 if (word_sig_index == 0) 2538 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2539 "missing I or J signature (for vmentry) in java.dyn.MethodHandle"); 2540 2541 bool found_vmentry = false; 2542 2543 const int n = (*fields_ptr)()->length(); 2544 for (int i = 0; i < n; i += instanceKlass::next_offset) { 2545 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset); 2546 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset); 2547 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset); 2548 symbolOop f_name = cp->symbol_at(name_index); 2549 symbolOop f_sig = cp->symbol_at(sig_index); 2550 if (f_sig == vmSymbols::byte_signature() && 2551 f_name == vmSymbols::vmentry_name() && 2552 (acc_flags & JVM_ACC_STATIC) == 0) { 2553 // Adjust the field type from byte to an unmanaged pointer. 2554 assert(fac_ptr->nonstatic_byte_count > 0, ""); 2555 fac_ptr->nonstatic_byte_count -= 1; 2556 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset, 2557 word_sig_index); 2558 fac_ptr->nonstatic_word_count += 1; 2559 2560 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset); 2561 assert(atype == NONSTATIC_BYTE, ""); 2562 FieldAllocationType new_atype = NONSTATIC_WORD; 2563 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype); 2564 2565 found_vmentry = true; 2566 break; 2567 } 2568 } 2569 2570 if (!found_vmentry) 2571 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2572 "missing vmentry byte field in java.dyn.MethodHandle"); 2573 2574 } 2575 2576 2577 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name, 2578 Handle class_loader, 2579 Handle protection_domain, 2580 KlassHandle host_klass, 2581 GrowableArray<Handle>* cp_patches, 2582 symbolHandle& parsed_name, 2583 bool verify, 2584 TRAPS) { 2585 // So that JVMTI can cache class file in the state before retransformable agents 2586 // have modified it 2587 unsigned char *cached_class_file_bytes = NULL; 2588 jint cached_class_file_length; 2589 2590 ClassFileStream* cfs = stream(); 2591 // Timing 2592 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 2593 JavaThread* jt = (JavaThread*) THREAD; 2594 2595 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 2596 ClassLoader::perf_class_parse_selftime(), 2597 NULL, 2598 jt->get_thread_stat()->perf_recursion_counts_addr(), 2599 jt->get_thread_stat()->perf_timers_addr(), 2600 PerfClassTraceTime::PARSE_CLASS); 2601 2602 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false; 2603 2604 if (JvmtiExport::should_post_class_file_load_hook()) { 2605 unsigned char* ptr = cfs->buffer(); 2606 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 2607 2608 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain, 2609 &ptr, &end_ptr, 2610 &cached_class_file_bytes, 2611 &cached_class_file_length); 2612 2613 if (ptr != cfs->buffer()) { 2614 // JVMTI agent has modified class file data. 2615 // Set new class file stream using JVMTI agent modified 2616 // class file data. 2617 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 2618 set_stream(cfs); 2619 } 2620 } 2621 2622 _host_klass = host_klass; 2623 _cp_patches = cp_patches; 2624 2625 instanceKlassHandle nullHandle; 2626 2627 // Figure out whether we can skip format checking (matching classic VM behavior) 2628 _need_verify = Verifier::should_verify_for(class_loader(), verify); 2629 2630 // Set the verify flag in stream 2631 cfs->set_verify(_need_verify); 2632 2633 // Save the class file name for easier error message printing. 2634 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name(); 2635 2636 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 2637 // Magic value 2638 u4 magic = cfs->get_u4_fast(); 2639 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 2640 "Incompatible magic value %u in class file %s", 2641 magic, CHECK_(nullHandle)); 2642 2643 // Version numbers 2644 u2 minor_version = cfs->get_u2_fast(); 2645 u2 major_version = cfs->get_u2_fast(); 2646 2647 // Check version numbers - we check this even with verifier off 2648 if (!is_supported_version(major_version, minor_version)) { 2649 if (name.is_null()) { 2650 Exceptions::fthrow( 2651 THREAD_AND_LOCATION, 2652 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2653 "Unsupported major.minor version %u.%u", 2654 major_version, 2655 minor_version); 2656 } else { 2657 ResourceMark rm(THREAD); 2658 Exceptions::fthrow( 2659 THREAD_AND_LOCATION, 2660 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2661 "%s : Unsupported major.minor version %u.%u", 2662 name->as_C_string(), 2663 major_version, 2664 minor_version); 2665 } 2666 return nullHandle; 2667 } 2668 2669 _major_version = major_version; 2670 _minor_version = minor_version; 2671 2672 2673 // Check if verification needs to be relaxed for this class file 2674 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 2675 _relax_verify = Verifier::relax_verify_for(class_loader()); 2676 2677 // Constant pool 2678 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 2679 int cp_size = cp->length(); 2680 2681 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 2682 2683 // Access flags 2684 AccessFlags access_flags; 2685 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 2686 2687 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2688 // Set abstract bit for old class files for backward compatibility 2689 flags |= JVM_ACC_ABSTRACT; 2690 } 2691 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 2692 access_flags.set_flags(flags); 2693 2694 // This class and superclass 2695 instanceKlassHandle super_klass; 2696 u2 this_class_index = cfs->get_u2_fast(); 2697 check_property( 2698 valid_cp_range(this_class_index, cp_size) && 2699 cp->tag_at(this_class_index).is_unresolved_klass(), 2700 "Invalid this class index %u in constant pool in class file %s", 2701 this_class_index, CHECK_(nullHandle)); 2702 2703 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index)); 2704 assert(class_name.not_null(), "class_name can't be null"); 2705 2706 // It's important to set parsed_name *before* resolving the super class. 2707 // (it's used for cleanup by the caller if parsing fails) 2708 parsed_name = class_name; 2709 2710 // Update _class_name which could be null previously to be class_name 2711 _class_name = class_name; 2712 2713 // Don't need to check whether this class name is legal or not. 2714 // It has been checked when constant pool is parsed. 2715 // However, make sure it is not an array type. 2716 if (_need_verify) { 2717 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 2718 "Bad class name in class file %s", 2719 CHECK_(nullHandle)); 2720 } 2721 2722 klassOop preserve_this_klass; // for storing result across HandleMark 2723 2724 // release all handles when parsing is done 2725 { HandleMark hm(THREAD); 2726 2727 // Checks if name in class file matches requested name 2728 if (name.not_null() && class_name() != name()) { 2729 ResourceMark rm(THREAD); 2730 Exceptions::fthrow( 2731 THREAD_AND_LOCATION, 2732 vmSymbolHandles::java_lang_NoClassDefFoundError(), 2733 "%s (wrong name: %s)", 2734 name->as_C_string(), 2735 class_name->as_C_string() 2736 ); 2737 return nullHandle; 2738 } 2739 2740 if (TraceClassLoadingPreorder) { 2741 tty->print("[Loading %s", name()->as_klass_external_name()); 2742 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 2743 tty->print_cr("]"); 2744 } 2745 2746 u2 super_class_index = cfs->get_u2_fast(); 2747 if (super_class_index == 0) { 2748 check_property(class_name() == vmSymbols::java_lang_Object(), 2749 "Invalid superclass index %u in class file %s", 2750 super_class_index, 2751 CHECK_(nullHandle)); 2752 } else { 2753 check_property(valid_cp_range(super_class_index, cp_size) && 2754 is_klass_reference(cp, super_class_index), 2755 "Invalid superclass index %u in class file %s", 2756 super_class_index, 2757 CHECK_(nullHandle)); 2758 // The class name should be legal because it is checked when parsing constant pool. 2759 // However, make sure it is not an array type. 2760 bool is_array = false; 2761 if (cp->tag_at(super_class_index).is_klass()) { 2762 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index)); 2763 if (_need_verify) 2764 is_array = super_klass->oop_is_array(); 2765 } else if (_need_verify) { 2766 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 2767 } 2768 if (_need_verify) { 2769 guarantee_property(!is_array, 2770 "Bad superclass name in class file %s", CHECK_(nullHandle)); 2771 } 2772 } 2773 2774 // Interfaces 2775 u2 itfs_len = cfs->get_u2_fast(); 2776 objArrayHandle local_interfaces; 2777 if (itfs_len == 0) { 2778 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 2779 } else { 2780 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle)); 2781 } 2782 2783 // Fields (offsets are filled in later) 2784 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0}; 2785 objArrayHandle fields_annotations; 2786 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle)); 2787 // Methods 2788 bool has_final_method = false; 2789 AccessFlags promoted_flags; 2790 promoted_flags.set_flags(0); 2791 // These need to be oop pointers because they are allocated lazily 2792 // inside parse_methods inside a nested HandleMark 2793 objArrayOop methods_annotations_oop = NULL; 2794 objArrayOop methods_parameter_annotations_oop = NULL; 2795 objArrayOop methods_default_annotations_oop = NULL; 2796 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(), 2797 &promoted_flags, 2798 &has_final_method, 2799 &methods_annotations_oop, 2800 &methods_parameter_annotations_oop, 2801 &methods_default_annotations_oop, 2802 CHECK_(nullHandle)); 2803 2804 objArrayHandle methods_annotations(THREAD, methods_annotations_oop); 2805 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop); 2806 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop); 2807 2808 // We check super class after class file is parsed and format is checked 2809 if (super_class_index > 0 && super_klass.is_null()) { 2810 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index)); 2811 if (access_flags.is_interface()) { 2812 // Before attempting to resolve the superclass, check for class format 2813 // errors not checked yet. 2814 guarantee_property(sk() == vmSymbols::java_lang_Object(), 2815 "Interfaces must have java.lang.Object as superclass in class file %s", 2816 CHECK_(nullHandle)); 2817 } 2818 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 2819 sk, 2820 class_loader, 2821 protection_domain, 2822 true, 2823 CHECK_(nullHandle)); 2824 2825 KlassHandle kh (THREAD, k); 2826 super_klass = instanceKlassHandle(THREAD, kh()); 2827 if (LinkWellKnownClasses) // my super class is well known to me 2828 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve 2829 } 2830 if (super_klass.not_null()) { 2831 if (super_klass->is_interface()) { 2832 ResourceMark rm(THREAD); 2833 Exceptions::fthrow( 2834 THREAD_AND_LOCATION, 2835 vmSymbolHandles::java_lang_IncompatibleClassChangeError(), 2836 "class %s has interface %s as super class", 2837 class_name->as_klass_external_name(), 2838 super_klass->external_name() 2839 ); 2840 return nullHandle; 2841 } 2842 // Make sure super class is not final 2843 if (super_klass->is_final()) { 2844 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 2845 } 2846 } 2847 2848 // Compute the transitive list of all unique interfaces implemented by this class 2849 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 2850 2851 // sort methods 2852 typeArrayHandle method_ordering = sort_methods(methods, 2853 methods_annotations, 2854 methods_parameter_annotations, 2855 methods_default_annotations, 2856 CHECK_(nullHandle)); 2857 2858 // promote flags from parse_methods() to the klass' flags 2859 access_flags.add_promoted_flags(promoted_flags.as_int()); 2860 2861 // Size of Java vtable (in words) 2862 int vtable_size = 0; 2863 int itable_size = 0; 2864 int num_miranda_methods = 0; 2865 2866 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size, 2867 num_miranda_methods, 2868 super_klass(), 2869 methods(), 2870 access_flags, 2871 class_loader, 2872 class_name, 2873 local_interfaces(), 2874 CHECK_(nullHandle)); 2875 2876 // Size of Java itable (in words) 2877 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces); 2878 2879 // Field size and offset computation 2880 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); 2881 #ifndef PRODUCT 2882 int orig_nonstatic_field_size = 0; 2883 #endif 2884 int static_field_size = 0; 2885 int next_static_oop_offset; 2886 int next_static_double_offset; 2887 int next_static_word_offset; 2888 int next_static_short_offset; 2889 int next_static_byte_offset; 2890 int next_static_type_offset; 2891 int next_nonstatic_oop_offset; 2892 int next_nonstatic_double_offset; 2893 int next_nonstatic_word_offset; 2894 int next_nonstatic_short_offset; 2895 int next_nonstatic_byte_offset; 2896 int next_nonstatic_type_offset; 2897 int first_nonstatic_oop_offset; 2898 int first_nonstatic_field_offset; 2899 int next_nonstatic_field_offset; 2900 2901 // Calculate the starting byte offsets 2902 next_static_oop_offset = (instanceKlass::header_size() + 2903 align_object_offset(vtable_size) + 2904 align_object_offset(itable_size)) * wordSize; 2905 next_static_double_offset = next_static_oop_offset + 2906 (fac.static_oop_count * heapOopSize); 2907 if ( fac.static_double_count && 2908 (Universe::field_type_should_be_aligned(T_DOUBLE) || 2909 Universe::field_type_should_be_aligned(T_LONG)) ) { 2910 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 2911 } 2912 2913 next_static_word_offset = next_static_double_offset + 2914 (fac.static_double_count * BytesPerLong); 2915 next_static_short_offset = next_static_word_offset + 2916 (fac.static_word_count * BytesPerInt); 2917 next_static_byte_offset = next_static_short_offset + 2918 (fac.static_short_count * BytesPerShort); 2919 next_static_type_offset = align_size_up((next_static_byte_offset + 2920 fac.static_byte_count ), wordSize ); 2921 static_field_size = (next_static_type_offset - 2922 next_static_oop_offset) / wordSize; 2923 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() + 2924 nonstatic_field_size * heapOopSize; 2925 next_nonstatic_field_offset = first_nonstatic_field_offset; 2926 2927 // Add fake fields for java.lang.Class instances (also see below) 2928 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2929 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle)); 2930 } 2931 2932 // adjust the vmentry field declaration in java.dyn.MethodHandle 2933 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) { 2934 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle)); 2935 } 2936 2937 // Add a fake "discovered" field if it is not present 2938 // for compatibility with earlier jdk's. 2939 if (class_name() == vmSymbols::java_lang_ref_Reference() 2940 && class_loader.is_null()) { 2941 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle)); 2942 } 2943 // end of "discovered" field compactibility fix 2944 2945 unsigned int nonstatic_double_count = fac.nonstatic_double_count; 2946 unsigned int nonstatic_word_count = fac.nonstatic_word_count; 2947 unsigned int nonstatic_short_count = fac.nonstatic_short_count; 2948 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count; 2949 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count; 2950 2951 bool super_has_nonstatic_fields = 2952 (super_klass() != NULL && super_klass->has_nonstatic_fields()); 2953 bool has_nonstatic_fields = super_has_nonstatic_fields || 2954 ((nonstatic_double_count + nonstatic_word_count + 2955 nonstatic_short_count + nonstatic_byte_count + 2956 nonstatic_oop_count) != 0); 2957 2958 2959 // Prepare list of oops for oop map generation. 2960 int* nonstatic_oop_offsets; 2961 unsigned int* nonstatic_oop_counts; 2962 unsigned int nonstatic_oop_map_count = 0; 2963 2964 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 2965 THREAD, int, nonstatic_oop_count + 1); 2966 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 2967 THREAD, unsigned int, nonstatic_oop_count + 1); 2968 2969 // Add fake fields for java.lang.Class instances (also see above). 2970 // FieldsAllocationStyle and CompactFields values will be reset to default. 2971 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2972 java_lang_Class_fix_post(&next_nonstatic_field_offset); 2973 nonstatic_oop_offsets[0] = first_nonstatic_field_offset; 2974 const uint fake_oop_count = (next_nonstatic_field_offset - 2975 first_nonstatic_field_offset) / heapOopSize; 2976 nonstatic_oop_counts[0] = fake_oop_count; 2977 nonstatic_oop_map_count = 1; 2978 nonstatic_oop_count -= fake_oop_count; 2979 first_nonstatic_oop_offset = first_nonstatic_field_offset; 2980 } else { 2981 first_nonstatic_oop_offset = 0; // will be set for first oop field 2982 } 2983 2984 #ifndef PRODUCT 2985 if( PrintCompactFieldsSavings ) { 2986 next_nonstatic_double_offset = next_nonstatic_field_offset + 2987 (nonstatic_oop_count * heapOopSize); 2988 if ( nonstatic_double_count > 0 ) { 2989 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong); 2990 } 2991 next_nonstatic_word_offset = next_nonstatic_double_offset + 2992 (nonstatic_double_count * BytesPerLong); 2993 next_nonstatic_short_offset = next_nonstatic_word_offset + 2994 (nonstatic_word_count * BytesPerInt); 2995 next_nonstatic_byte_offset = next_nonstatic_short_offset + 2996 (nonstatic_short_count * BytesPerShort); 2997 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset + 2998 nonstatic_byte_count ), heapOopSize ); 2999 orig_nonstatic_field_size = nonstatic_field_size + 3000 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize); 3001 } 3002 #endif 3003 bool compact_fields = CompactFields; 3004 int allocation_style = FieldsAllocationStyle; 3005 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3006 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3007 allocation_style = 1; // Optimistic 3008 } 3009 3010 // The next classes have predefined hard-coded fields offsets 3011 // (see in JavaClasses::compute_hard_coded_offsets()). 3012 // Use default fields allocation order for them. 3013 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3014 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() || 3015 class_name() == vmSymbols::java_lang_Class() || 3016 class_name() == vmSymbols::java_lang_ClassLoader() || 3017 class_name() == vmSymbols::java_lang_ref_Reference() || 3018 class_name() == vmSymbols::java_lang_ref_SoftReference() || 3019 class_name() == vmSymbols::java_lang_StackTraceElement() || 3020 class_name() == vmSymbols::java_lang_String() || 3021 class_name() == vmSymbols::java_lang_Throwable() || 3022 class_name() == vmSymbols::java_lang_Boolean() || 3023 class_name() == vmSymbols::java_lang_Character() || 3024 class_name() == vmSymbols::java_lang_Float() || 3025 class_name() == vmSymbols::java_lang_Double() || 3026 class_name() == vmSymbols::java_lang_Byte() || 3027 class_name() == vmSymbols::java_lang_Short() || 3028 class_name() == vmSymbols::java_lang_Integer() || 3029 class_name() == vmSymbols::java_lang_Long())) { 3030 allocation_style = 0; // Allocate oops first 3031 compact_fields = false; // Don't compact fields 3032 } 3033 3034 if( allocation_style == 0 ) { 3035 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes 3036 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3037 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3038 (nonstatic_oop_count * heapOopSize); 3039 } else if( allocation_style == 1 ) { 3040 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops 3041 next_nonstatic_double_offset = next_nonstatic_field_offset; 3042 } else if( allocation_style == 2 ) { 3043 // Fields allocation: oops fields in super and sub classes are together. 3044 if( nonstatic_field_size > 0 && super_klass() != NULL && 3045 super_klass->nonstatic_oop_map_size() > 0 ) { 3046 int map_size = super_klass->nonstatic_oop_map_size(); 3047 OopMapBlock* first_map = super_klass->start_of_nonstatic_oop_maps(); 3048 OopMapBlock* last_map = first_map + map_size - 1; 3049 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3050 if (next_offset == next_nonstatic_field_offset) { 3051 allocation_style = 0; // allocate oops first 3052 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3053 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3054 (nonstatic_oop_count * heapOopSize); 3055 } 3056 } 3057 if( allocation_style == 2 ) { 3058 allocation_style = 1; // allocate oops last 3059 next_nonstatic_double_offset = next_nonstatic_field_offset; 3060 } 3061 } else { 3062 ShouldNotReachHere(); 3063 } 3064 3065 int nonstatic_oop_space_count = 0; 3066 int nonstatic_word_space_count = 0; 3067 int nonstatic_short_space_count = 0; 3068 int nonstatic_byte_space_count = 0; 3069 int nonstatic_oop_space_offset; 3070 int nonstatic_word_space_offset; 3071 int nonstatic_short_space_offset; 3072 int nonstatic_byte_space_offset; 3073 3074 if( nonstatic_double_count > 0 ) { 3075 int offset = next_nonstatic_double_offset; 3076 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3077 if( compact_fields && offset != next_nonstatic_double_offset ) { 3078 // Allocate available fields into the gap before double field. 3079 int length = next_nonstatic_double_offset - offset; 3080 assert(length == BytesPerInt, ""); 3081 nonstatic_word_space_offset = offset; 3082 if( nonstatic_word_count > 0 ) { 3083 nonstatic_word_count -= 1; 3084 nonstatic_word_space_count = 1; // Only one will fit 3085 length -= BytesPerInt; 3086 offset += BytesPerInt; 3087 } 3088 nonstatic_short_space_offset = offset; 3089 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3090 nonstatic_short_count -= 1; 3091 nonstatic_short_space_count += 1; 3092 length -= BytesPerShort; 3093 offset += BytesPerShort; 3094 } 3095 nonstatic_byte_space_offset = offset; 3096 while( length > 0 && nonstatic_byte_count > 0 ) { 3097 nonstatic_byte_count -= 1; 3098 nonstatic_byte_space_count += 1; 3099 length -= 1; 3100 } 3101 // Allocate oop field in the gap if there are no other fields for that. 3102 nonstatic_oop_space_offset = offset; 3103 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3104 allocation_style != 0 ) { // when oop fields not first 3105 nonstatic_oop_count -= 1; 3106 nonstatic_oop_space_count = 1; // Only one will fit 3107 length -= heapOopSize; 3108 offset += heapOopSize; 3109 } 3110 } 3111 } 3112 3113 next_nonstatic_word_offset = next_nonstatic_double_offset + 3114 (nonstatic_double_count * BytesPerLong); 3115 next_nonstatic_short_offset = next_nonstatic_word_offset + 3116 (nonstatic_word_count * BytesPerInt); 3117 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3118 (nonstatic_short_count * BytesPerShort); 3119 3120 int notaligned_offset; 3121 if( allocation_style == 0 ) { 3122 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3123 } else { // allocation_style == 1 3124 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3125 if( nonstatic_oop_count > 0 ) { 3126 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3127 } 3128 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3129 } 3130 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize ); 3131 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset 3132 - first_nonstatic_field_offset)/heapOopSize); 3133 3134 // Iterate over fields again and compute correct offsets. 3135 // The field allocation type was temporarily stored in the offset slot. 3136 // oop fields are located before non-oop fields (static and non-static). 3137 int len = fields->length(); 3138 for (int i = 0; i < len; i += instanceKlass::next_offset) { 3139 int real_offset; 3140 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset); 3141 switch (atype) { 3142 case STATIC_OOP: 3143 real_offset = next_static_oop_offset; 3144 next_static_oop_offset += heapOopSize; 3145 break; 3146 case STATIC_BYTE: 3147 real_offset = next_static_byte_offset; 3148 next_static_byte_offset += 1; 3149 break; 3150 case STATIC_SHORT: 3151 real_offset = next_static_short_offset; 3152 next_static_short_offset += BytesPerShort; 3153 break; 3154 case STATIC_WORD: 3155 real_offset = next_static_word_offset; 3156 next_static_word_offset += BytesPerInt; 3157 break; 3158 case STATIC_ALIGNED_DOUBLE: 3159 case STATIC_DOUBLE: 3160 real_offset = next_static_double_offset; 3161 next_static_double_offset += BytesPerLong; 3162 break; 3163 case NONSTATIC_OOP: 3164 if( nonstatic_oop_space_count > 0 ) { 3165 real_offset = nonstatic_oop_space_offset; 3166 nonstatic_oop_space_offset += heapOopSize; 3167 nonstatic_oop_space_count -= 1; 3168 } else { 3169 real_offset = next_nonstatic_oop_offset; 3170 next_nonstatic_oop_offset += heapOopSize; 3171 } 3172 // Update oop maps 3173 if( nonstatic_oop_map_count > 0 && 3174 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3175 real_offset - 3176 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3177 heapOopSize ) { 3178 // Extend current oop map 3179 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3180 } else { 3181 // Create new oop map 3182 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3183 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3184 nonstatic_oop_map_count += 1; 3185 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3186 first_nonstatic_oop_offset = real_offset; 3187 } 3188 } 3189 break; 3190 case NONSTATIC_BYTE: 3191 if( nonstatic_byte_space_count > 0 ) { 3192 real_offset = nonstatic_byte_space_offset; 3193 nonstatic_byte_space_offset += 1; 3194 nonstatic_byte_space_count -= 1; 3195 } else { 3196 real_offset = next_nonstatic_byte_offset; 3197 next_nonstatic_byte_offset += 1; 3198 } 3199 break; 3200 case NONSTATIC_SHORT: 3201 if( nonstatic_short_space_count > 0 ) { 3202 real_offset = nonstatic_short_space_offset; 3203 nonstatic_short_space_offset += BytesPerShort; 3204 nonstatic_short_space_count -= 1; 3205 } else { 3206 real_offset = next_nonstatic_short_offset; 3207 next_nonstatic_short_offset += BytesPerShort; 3208 } 3209 break; 3210 case NONSTATIC_WORD: 3211 if( nonstatic_word_space_count > 0 ) { 3212 real_offset = nonstatic_word_space_offset; 3213 nonstatic_word_space_offset += BytesPerInt; 3214 nonstatic_word_space_count -= 1; 3215 } else { 3216 real_offset = next_nonstatic_word_offset; 3217 next_nonstatic_word_offset += BytesPerInt; 3218 } 3219 break; 3220 case NONSTATIC_ALIGNED_DOUBLE: 3221 case NONSTATIC_DOUBLE: 3222 real_offset = next_nonstatic_double_offset; 3223 next_nonstatic_double_offset += BytesPerLong; 3224 break; 3225 default: 3226 ShouldNotReachHere(); 3227 } 3228 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset)); 3229 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset)); 3230 } 3231 3232 // Size of instances 3233 int instance_size; 3234 3235 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); 3236 instance_size = align_object_size(next_nonstatic_type_offset / wordSize); 3237 3238 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value"); 3239 3240 // Number of non-static oop map blocks allocated at end of klass. 3241 const unsigned int total_oop_map_count = 3242 compute_oop_map_count(super_klass, nonstatic_oop_map_count, 3243 first_nonstatic_oop_offset); 3244 3245 // Compute reference type 3246 ReferenceType rt; 3247 if (super_klass() == NULL) { 3248 rt = REF_NONE; 3249 } else { 3250 rt = super_klass->reference_type(); 3251 } 3252 3253 // We can now create the basic klassOop for this klass 3254 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size, 3255 static_field_size, 3256 total_oop_map_count, 3257 rt, CHECK_(nullHandle)); 3258 instanceKlassHandle this_klass (THREAD, ik); 3259 3260 assert(this_klass->static_field_size() == static_field_size, "sanity"); 3261 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count, 3262 "sanity"); 3263 3264 // Fill in information already parsed 3265 this_klass->set_access_flags(access_flags); 3266 this_klass->set_should_verify_class(verify); 3267 jint lh = Klass::instance_layout_helper(instance_size, false); 3268 this_klass->set_layout_helper(lh); 3269 assert(this_klass->oop_is_instance(), "layout is correct"); 3270 assert(this_klass->size_helper() == instance_size, "correct size_helper"); 3271 // Not yet: supers are done below to support the new subtype-checking fields 3272 //this_klass->set_super(super_klass()); 3273 this_klass->set_class_loader(class_loader()); 3274 this_klass->set_nonstatic_field_size(nonstatic_field_size); 3275 this_klass->set_has_nonstatic_fields(has_nonstatic_fields); 3276 this_klass->set_static_oop_field_size(fac.static_oop_count); 3277 cp->set_pool_holder(this_klass()); 3278 this_klass->set_constants(cp()); 3279 this_klass->set_local_interfaces(local_interfaces()); 3280 this_klass->set_fields(fields()); 3281 this_klass->set_methods(methods()); 3282 if (has_final_method) { 3283 this_klass->set_has_final_method(); 3284 } 3285 this_klass->set_method_ordering(method_ordering()); 3286 // The instanceKlass::_methods_jmethod_ids cache and the 3287 // instanceKlass::_methods_cached_itable_indices cache are 3288 // both managed on the assumption that the initial cache 3289 // size is equal to the number of methods in the class. If 3290 // that changes, then instanceKlass::idnum_can_increment() 3291 // has to be changed accordingly. 3292 this_klass->set_initial_method_idnum(methods->length()); 3293 this_klass->set_name(cp->klass_name_at(this_class_index)); 3294 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself 3295 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 3296 this_klass->set_protection_domain(protection_domain()); 3297 this_klass->set_fields_annotations(fields_annotations()); 3298 this_klass->set_methods_annotations(methods_annotations()); 3299 this_klass->set_methods_parameter_annotations(methods_parameter_annotations()); 3300 this_klass->set_methods_default_annotations(methods_default_annotations()); 3301 3302 this_klass->set_minor_version(minor_version); 3303 this_klass->set_major_version(major_version); 3304 3305 // Set up methodOop::intrinsic_id as soon as we know the names of methods. 3306 // (We used to do this lazily, but now we query it in Rewriter, 3307 // which is eagerly done for every method, so we might as well do it now, 3308 // when everything is fresh in memory.) 3309 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) { 3310 for (int j = 0; j < methods->length(); j++) { 3311 ((methodOop)methods->obj_at(j))->init_intrinsic_id(); 3312 } 3313 } 3314 3315 if (cached_class_file_bytes != NULL) { 3316 // JVMTI: we have an instanceKlass now, tell it about the cached bytes 3317 this_klass->set_cached_class_file(cached_class_file_bytes, 3318 cached_class_file_length); 3319 } 3320 3321 // Miranda methods 3322 if ((num_miranda_methods > 0) || 3323 // if this class introduced new miranda methods or 3324 (super_klass.not_null() && (super_klass->has_miranda_methods())) 3325 // super class exists and this class inherited miranda methods 3326 ) { 3327 this_klass->set_has_miranda_methods(); // then set a flag 3328 } 3329 3330 // Additional attributes 3331 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle)); 3332 3333 // Make sure this is the end of class file stream 3334 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3335 3336 // Initialize static fields 3337 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle)); 3338 3339 // VerifyOops believes that once this has been set, the object is completely loaded. 3340 // Compute transitive closure of interfaces this class implements 3341 this_klass->set_transitive_interfaces(transitive_interfaces()); 3342 3343 // Fill in information needed to compute superclasses. 3344 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 3345 3346 // Initialize itable offset tables 3347 klassItable::setup_itable_offset_table(this_klass); 3348 3349 // Do final class setup 3350 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts); 3351 3352 set_precomputed_flags(this_klass); 3353 3354 // reinitialize modifiers, using the InnerClasses attribute 3355 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 3356 this_klass->set_modifier_flags(computed_modifiers); 3357 3358 // check if this class can access its super class 3359 check_super_class_access(this_klass, CHECK_(nullHandle)); 3360 3361 // check if this class can access its superinterfaces 3362 check_super_interface_access(this_klass, CHECK_(nullHandle)); 3363 3364 // check if this class overrides any final method 3365 check_final_method_override(this_klass, CHECK_(nullHandle)); 3366 3367 // check that if this class is an interface then it doesn't have static methods 3368 if (this_klass->is_interface()) { 3369 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 3370 } 3371 3372 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()), 3373 false /* not shared class */); 3374 3375 if (TraceClassLoading) { 3376 // print in a single call to reduce interleaving of output 3377 if (cfs->source() != NULL) { 3378 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3379 cfs->source()); 3380 } else if (class_loader.is_null()) { 3381 if (THREAD->is_Java_thread()) { 3382 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 3383 tty->print("[Loaded %s by instance of %s]\n", 3384 this_klass->external_name(), 3385 instanceKlass::cast(caller)->external_name()); 3386 } else { 3387 tty->print("[Loaded %s]\n", this_klass->external_name()); 3388 } 3389 } else { 3390 ResourceMark rm; 3391 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3392 instanceKlass::cast(class_loader->klass())->external_name()); 3393 } 3394 } 3395 3396 if (TraceClassResolution) { 3397 // print out the superclass. 3398 const char * from = Klass::cast(this_klass())->external_name(); 3399 if (this_klass->java_super() != NULL) { 3400 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name()); 3401 } 3402 // print out each of the interface classes referred to by this class. 3403 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces()); 3404 if (!local_interfaces.is_null()) { 3405 int length = local_interfaces->length(); 3406 for (int i = 0; i < length; i++) { 3407 klassOop k = klassOop(local_interfaces->obj_at(i)); 3408 instanceKlass* to_class = instanceKlass::cast(k); 3409 const char * to = to_class->external_name(); 3410 tty->print("RESOLVE %s %s (interface)\n", from, to); 3411 } 3412 } 3413 } 3414 3415 #ifndef PRODUCT 3416 if( PrintCompactFieldsSavings ) { 3417 if( nonstatic_field_size < orig_nonstatic_field_size ) { 3418 tty->print("[Saved %d of %d bytes in %s]\n", 3419 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize, 3420 orig_nonstatic_field_size*heapOopSize, 3421 this_klass->external_name()); 3422 } else if( nonstatic_field_size > orig_nonstatic_field_size ) { 3423 tty->print("[Wasted %d over %d bytes in %s]\n", 3424 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize, 3425 orig_nonstatic_field_size*heapOopSize, 3426 this_klass->external_name()); 3427 } 3428 } 3429 #endif 3430 3431 // preserve result across HandleMark 3432 preserve_this_klass = this_klass(); 3433 } 3434 3435 // Create new handle outside HandleMark 3436 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 3437 debug_only(this_klass->as_klassOop()->verify();) 3438 3439 return this_klass; 3440 } 3441 3442 3443 unsigned int 3444 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 3445 unsigned int nonstatic_oop_map_count, 3446 int first_nonstatic_oop_offset) { 3447 unsigned int map_count = 3448 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 3449 if (nonstatic_oop_map_count > 0) { 3450 // We have oops to add to map 3451 if (map_count == 0) { 3452 map_count = nonstatic_oop_map_count; 3453 } else { 3454 // Check whether we should add a new map block or whether the last one can 3455 // be extended 3456 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3457 OopMapBlock* const last_map = first_map + map_count - 1; 3458 3459 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3460 if (next_offset == first_nonstatic_oop_offset) { 3461 // There is no gap bettwen superklass's last oop field and first 3462 // local oop field, merge maps. 3463 nonstatic_oop_map_count -= 1; 3464 } else { 3465 // Superklass didn't end with a oop field, add extra maps 3466 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3467 } 3468 map_count += nonstatic_oop_map_count; 3469 } 3470 } 3471 return map_count; 3472 } 3473 3474 3475 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 3476 unsigned int nonstatic_oop_map_count, 3477 int* nonstatic_oop_offsets, 3478 unsigned int* nonstatic_oop_counts) { 3479 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 3480 const instanceKlass* const super = k->superklass(); 3481 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 3482 if (super_count > 0) { 3483 // Copy maps from superklass 3484 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 3485 for (unsigned int i = 0; i < super_count; ++i) { 3486 *this_oop_map++ = *super_oop_map++; 3487 } 3488 } 3489 3490 if (nonstatic_oop_map_count > 0) { 3491 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 3492 // The counts differ because there is no gap between superklass's last oop 3493 // field and the first local oop field. Extend the last oop map copied 3494 // from the superklass instead of creating new one. 3495 nonstatic_oop_map_count--; 3496 nonstatic_oop_offsets++; 3497 this_oop_map--; 3498 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 3499 this_oop_map++; 3500 } 3501 3502 // Add new map blocks, fill them 3503 while (nonstatic_oop_map_count-- > 0) { 3504 this_oop_map->set_offset(*nonstatic_oop_offsets++); 3505 this_oop_map->set_count(*nonstatic_oop_counts++); 3506 this_oop_map++; 3507 } 3508 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 3509 this_oop_map, "sanity"); 3510 } 3511 } 3512 3513 3514 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 3515 klassOop super = k->super(); 3516 3517 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 3518 // in which case we don't have to register objects as finalizable 3519 if (!_has_empty_finalizer) { 3520 if (_has_finalizer || 3521 (super != NULL && super->klass_part()->has_finalizer())) { 3522 k->set_has_finalizer(); 3523 } 3524 } 3525 3526 #ifdef ASSERT 3527 bool f = false; 3528 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(), 3529 vmSymbols::void_method_signature()); 3530 if (m != NULL && !m->is_empty_method()) { 3531 f = true; 3532 } 3533 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 3534 #endif 3535 3536 // Check if this klass supports the java.lang.Cloneable interface 3537 if (SystemDictionary::Cloneable_klass_loaded()) { 3538 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 3539 k->set_is_cloneable(); 3540 } 3541 } 3542 3543 // Check if this klass has a vanilla default constructor 3544 if (super == NULL) { 3545 // java.lang.Object has empty default constructor 3546 k->set_has_vanilla_constructor(); 3547 } else { 3548 if (Klass::cast(super)->has_vanilla_constructor() && 3549 _has_vanilla_constructor) { 3550 k->set_has_vanilla_constructor(); 3551 } 3552 #ifdef ASSERT 3553 bool v = false; 3554 if (Klass::cast(super)->has_vanilla_constructor()) { 3555 methodOop constructor = k->find_method(vmSymbols::object_initializer_name( 3556 ), vmSymbols::void_method_signature()); 3557 if (constructor != NULL && constructor->is_vanilla_constructor()) { 3558 v = true; 3559 } 3560 } 3561 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 3562 #endif 3563 } 3564 3565 // If it cannot be fast-path allocated, set a bit in the layout helper. 3566 // See documentation of instanceKlass::can_be_fastpath_allocated(). 3567 assert(k->size_helper() > 0, "layout_helper is initialized"); 3568 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 3569 || k->is_abstract() || k->is_interface() 3570 || (k->name() == vmSymbols::java_lang_Class() 3571 && k->class_loader() == NULL) 3572 || k->size_helper() >= FastAllocateSizeLimit) { 3573 // Forbid fast-path allocation. 3574 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 3575 k->set_layout_helper(lh); 3576 } 3577 } 3578 3579 3580 // utility method for appending and array with check for duplicates 3581 3582 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) { 3583 // iterate over new interfaces 3584 for (int i = 0; i < ifs->length(); i++) { 3585 oop e = ifs->obj_at(i); 3586 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking"); 3587 // check for duplicates 3588 bool duplicate = false; 3589 for (int j = 0; j < index; j++) { 3590 if (result->obj_at(j) == e) { 3591 duplicate = true; 3592 break; 3593 } 3594 } 3595 // add new interface 3596 if (!duplicate) { 3597 result->obj_at_put(index++, e); 3598 } 3599 } 3600 } 3601 3602 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) { 3603 // Compute maximum size for transitive interfaces 3604 int max_transitive_size = 0; 3605 int super_size = 0; 3606 // Add superclass transitive interfaces size 3607 if (super.not_null()) { 3608 super_size = super->transitive_interfaces()->length(); 3609 max_transitive_size += super_size; 3610 } 3611 // Add local interfaces' super interfaces 3612 int local_size = local_ifs->length(); 3613 for (int i = 0; i < local_size; i++) { 3614 klassOop l = klassOop(local_ifs->obj_at(i)); 3615 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length(); 3616 } 3617 // Finally add local interfaces 3618 max_transitive_size += local_size; 3619 // Construct array 3620 objArrayHandle result; 3621 if (max_transitive_size == 0) { 3622 // no interfaces, use canonicalized array 3623 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 3624 } else if (max_transitive_size == super_size) { 3625 // no new local interfaces added, share superklass' transitive interface array 3626 result = objArrayHandle(THREAD, super->transitive_interfaces()); 3627 } else if (max_transitive_size == local_size) { 3628 // only local interfaces added, share local interface array 3629 result = local_ifs; 3630 } else { 3631 objArrayHandle nullHandle; 3632 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle)); 3633 result = objArrayHandle(THREAD, new_objarray); 3634 int index = 0; 3635 // Copy down from superclass 3636 if (super.not_null()) { 3637 append_interfaces(result, index, super->transitive_interfaces()); 3638 } 3639 // Copy down from local interfaces' superinterfaces 3640 for (int i = 0; i < local_ifs->length(); i++) { 3641 klassOop l = klassOop(local_ifs->obj_at(i)); 3642 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces()); 3643 } 3644 // Finally add local interfaces 3645 append_interfaces(result, index, local_ifs()); 3646 3647 // Check if duplicates were removed 3648 if (index != max_transitive_size) { 3649 assert(index < max_transitive_size, "just checking"); 3650 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle)); 3651 for (int i = 0; i < index; i++) { 3652 oop e = result->obj_at(i); 3653 assert(e != NULL, "just checking"); 3654 new_result->obj_at_put(i, e); 3655 } 3656 result = objArrayHandle(THREAD, new_result); 3657 } 3658 } 3659 return result; 3660 } 3661 3662 3663 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 3664 klassOop super = this_klass->super(); 3665 if ((super != NULL) && 3666 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) { 3667 ResourceMark rm(THREAD); 3668 Exceptions::fthrow( 3669 THREAD_AND_LOCATION, 3670 vmSymbolHandles::java_lang_IllegalAccessError(), 3671 "class %s cannot access its superclass %s", 3672 this_klass->external_name(), 3673 instanceKlass::cast(super)->external_name() 3674 ); 3675 return; 3676 } 3677 } 3678 3679 3680 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 3681 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces()); 3682 int lng = local_interfaces->length(); 3683 for (int i = lng - 1; i >= 0; i--) { 3684 klassOop k = klassOop(local_interfaces->obj_at(i)); 3685 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface"); 3686 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) { 3687 ResourceMark rm(THREAD); 3688 Exceptions::fthrow( 3689 THREAD_AND_LOCATION, 3690 vmSymbolHandles::java_lang_IllegalAccessError(), 3691 "class %s cannot access its superinterface %s", 3692 this_klass->external_name(), 3693 instanceKlass::cast(k)->external_name() 3694 ); 3695 return; 3696 } 3697 } 3698 } 3699 3700 3701 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 3702 objArrayHandle methods (THREAD, this_klass->methods()); 3703 int num_methods = methods->length(); 3704 3705 // go thru each method and check if it overrides a final method 3706 for (int index = 0; index < num_methods; index++) { 3707 methodOop m = (methodOop)methods->obj_at(index); 3708 3709 // skip private, static and <init> methods 3710 if ((!m->is_private()) && 3711 (!m->is_static()) && 3712 (m->name() != vmSymbols::object_initializer_name())) { 3713 3714 symbolOop name = m->name(); 3715 symbolOop signature = m->signature(); 3716 klassOop k = this_klass->super(); 3717 methodOop super_m = NULL; 3718 while (k != NULL) { 3719 // skip supers that don't have final methods. 3720 if (k->klass_part()->has_final_method()) { 3721 // lookup a matching method in the super class hierarchy 3722 super_m = instanceKlass::cast(k)->lookup_method(name, signature); 3723 if (super_m == NULL) { 3724 break; // didn't find any match; get out 3725 } 3726 3727 if (super_m->is_final() && 3728 // matching method in super is final 3729 (Reflection::verify_field_access(this_klass->as_klassOop(), 3730 super_m->method_holder(), 3731 super_m->method_holder(), 3732 super_m->access_flags(), false)) 3733 // this class can access super final method and therefore override 3734 ) { 3735 ResourceMark rm(THREAD); 3736 Exceptions::fthrow( 3737 THREAD_AND_LOCATION, 3738 vmSymbolHandles::java_lang_VerifyError(), 3739 "class %s overrides final method %s.%s", 3740 this_klass->external_name(), 3741 name->as_C_string(), 3742 signature->as_C_string() 3743 ); 3744 return; 3745 } 3746 3747 // continue to look from super_m's holder's super. 3748 k = instanceKlass::cast(super_m->method_holder())->super(); 3749 continue; 3750 } 3751 3752 k = k->klass_part()->super(); 3753 } 3754 } 3755 } 3756 } 3757 3758 3759 // assumes that this_klass is an interface 3760 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 3761 assert(this_klass->is_interface(), "not an interface"); 3762 objArrayHandle methods (THREAD, this_klass->methods()); 3763 int num_methods = methods->length(); 3764 3765 for (int index = 0; index < num_methods; index++) { 3766 methodOop m = (methodOop)methods->obj_at(index); 3767 // if m is static and not the init method, throw a verify error 3768 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 3769 ResourceMark rm(THREAD); 3770 Exceptions::fthrow( 3771 THREAD_AND_LOCATION, 3772 vmSymbolHandles::java_lang_VerifyError(), 3773 "Illegal static method %s in interface %s", 3774 m->name()->as_C_string(), 3775 this_klass->external_name() 3776 ); 3777 return; 3778 } 3779 } 3780 } 3781 3782 // utility methods for format checking 3783 3784 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 3785 if (!_need_verify) { return; } 3786 3787 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3788 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3789 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3790 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 3791 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3792 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 3793 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3794 3795 if ((is_abstract && is_final) || 3796 (is_interface && !is_abstract) || 3797 (is_interface && major_gte_15 && (is_super || is_enum)) || 3798 (!is_interface && major_gte_15 && is_annotation)) { 3799 ResourceMark rm(THREAD); 3800 Exceptions::fthrow( 3801 THREAD_AND_LOCATION, 3802 vmSymbolHandles::java_lang_ClassFormatError(), 3803 "Illegal class modifiers in class %s: 0x%X", 3804 _class_name->as_C_string(), flags 3805 ); 3806 return; 3807 } 3808 } 3809 3810 bool ClassFileParser::has_illegal_visibility(jint flags) { 3811 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3812 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3813 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3814 3815 return ((is_public && is_protected) || 3816 (is_public && is_private) || 3817 (is_protected && is_private)); 3818 } 3819 3820 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 3821 u2 max_version = 3822 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : 3823 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION); 3824 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 3825 (major <= max_version) && 3826 ((major != max_version) || 3827 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 3828 } 3829 3830 void ClassFileParser::verify_legal_field_modifiers( 3831 jint flags, bool is_interface, TRAPS) { 3832 if (!_need_verify) { return; } 3833 3834 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3835 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3836 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3837 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3838 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3839 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 3840 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 3841 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3842 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3843 3844 bool is_illegal = false; 3845 3846 if (is_interface) { 3847 if (!is_public || !is_static || !is_final || is_private || 3848 is_protected || is_volatile || is_transient || 3849 (major_gte_15 && is_enum)) { 3850 is_illegal = true; 3851 } 3852 } else { // not interface 3853 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 3854 is_illegal = true; 3855 } 3856 } 3857 3858 if (is_illegal) { 3859 ResourceMark rm(THREAD); 3860 Exceptions::fthrow( 3861 THREAD_AND_LOCATION, 3862 vmSymbolHandles::java_lang_ClassFormatError(), 3863 "Illegal field modifiers in class %s: 0x%X", 3864 _class_name->as_C_string(), flags); 3865 return; 3866 } 3867 } 3868 3869 void ClassFileParser::verify_legal_method_modifiers( 3870 jint flags, bool is_interface, symbolHandle name, TRAPS) { 3871 if (!_need_verify) { return; } 3872 3873 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3874 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3875 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3876 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3877 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 3878 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3879 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 3880 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 3881 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 3882 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3883 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 3884 3885 bool is_illegal = false; 3886 3887 if (is_interface) { 3888 if (!is_abstract || !is_public || is_static || is_final || 3889 is_native || (major_gte_15 && (is_synchronized || is_strict))) { 3890 is_illegal = true; 3891 } 3892 } else { // not interface 3893 if (is_initializer) { 3894 if (is_static || is_final || is_synchronized || is_native || 3895 is_abstract || (major_gte_15 && is_bridge)) { 3896 is_illegal = true; 3897 } 3898 } else { // not initializer 3899 if (is_abstract) { 3900 if ((is_final || is_native || is_private || is_static || 3901 (major_gte_15 && (is_synchronized || is_strict)))) { 3902 is_illegal = true; 3903 } 3904 } 3905 if (has_illegal_visibility(flags)) { 3906 is_illegal = true; 3907 } 3908 } 3909 } 3910 3911 if (is_illegal) { 3912 ResourceMark rm(THREAD); 3913 Exceptions::fthrow( 3914 THREAD_AND_LOCATION, 3915 vmSymbolHandles::java_lang_ClassFormatError(), 3916 "Method %s in class %s has illegal modifiers: 0x%X", 3917 name->as_C_string(), _class_name->as_C_string(), flags); 3918 return; 3919 } 3920 } 3921 3922 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 3923 assert(_need_verify, "only called when _need_verify is true"); 3924 int i = 0; 3925 int count = length >> 2; 3926 for (int k=0; k<count; k++) { 3927 unsigned char b0 = buffer[i]; 3928 unsigned char b1 = buffer[i+1]; 3929 unsigned char b2 = buffer[i+2]; 3930 unsigned char b3 = buffer[i+3]; 3931 // For an unsigned char v, 3932 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 3933 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 3934 unsigned char res = b0 | b0 - 1 | 3935 b1 | b1 - 1 | 3936 b2 | b2 - 1 | 3937 b3 | b3 - 1; 3938 if (res >= 128) break; 3939 i += 4; 3940 } 3941 for(; i < length; i++) { 3942 unsigned short c; 3943 // no embedded zeros 3944 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 3945 if(buffer[i] < 128) { 3946 continue; 3947 } 3948 if ((i + 5) < length) { // see if it's legal supplementary character 3949 if (UTF8::is_supplementary_character(&buffer[i])) { 3950 c = UTF8::get_supplementary_character(&buffer[i]); 3951 i += 5; 3952 continue; 3953 } 3954 } 3955 switch (buffer[i] >> 4) { 3956 default: break; 3957 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 3958 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3959 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 3960 c = (buffer[i] & 0x1F) << 6; 3961 i++; 3962 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 3963 c += buffer[i] & 0x3F; 3964 if (_major_version <= 47 || c == 0 || c >= 0x80) { 3965 // for classes with major > 47, c must a null or a character in its shortest form 3966 break; 3967 } 3968 } 3969 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3970 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 3971 c = (buffer[i] & 0xF) << 12; 3972 i += 2; 3973 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 3974 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 3975 if (_major_version <= 47 || c >= 0x800) { 3976 // for classes with major > 47, c must be in its shortest form 3977 break; 3978 } 3979 } 3980 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3981 } // end of switch 3982 } // end of for 3983 } 3984 3985 // Checks if name is a legal class name. 3986 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) { 3987 if (!_need_verify || _relax_verify) { return; } 3988 3989 char buf[fixed_buffer_size]; 3990 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3991 unsigned int length = name->utf8_length(); 3992 bool legal = false; 3993 3994 if (length > 0) { 3995 char* p; 3996 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 3997 p = skip_over_field_signature(bytes, false, length, CHECK); 3998 legal = (p != NULL) && ((p - bytes) == (int)length); 3999 } else if (_major_version < JAVA_1_5_VERSION) { 4000 if (bytes[0] != '<') { 4001 p = skip_over_field_name(bytes, true, length); 4002 legal = (p != NULL) && ((p - bytes) == (int)length); 4003 } 4004 } else { 4005 // 4900761: relax the constraints based on JSR202 spec 4006 // Class names may be drawn from the entire Unicode character set. 4007 // Identifiers between '/' must be unqualified names. 4008 // The utf8 string has been verified when parsing cpool entries. 4009 legal = verify_unqualified_name(bytes, length, LegalClass); 4010 } 4011 } 4012 if (!legal) { 4013 ResourceMark rm(THREAD); 4014 Exceptions::fthrow( 4015 THREAD_AND_LOCATION, 4016 vmSymbolHandles::java_lang_ClassFormatError(), 4017 "Illegal class name \"%s\" in class file %s", bytes, 4018 _class_name->as_C_string() 4019 ); 4020 return; 4021 } 4022 } 4023 4024 // Checks if name is a legal field name. 4025 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) { 4026 if (!_need_verify || _relax_verify) { return; } 4027 4028 char buf[fixed_buffer_size]; 4029 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4030 unsigned int length = name->utf8_length(); 4031 bool legal = false; 4032 4033 if (length > 0) { 4034 if (_major_version < JAVA_1_5_VERSION) { 4035 if (bytes[0] != '<') { 4036 char* p = skip_over_field_name(bytes, false, length); 4037 legal = (p != NULL) && ((p - bytes) == (int)length); 4038 } 4039 } else { 4040 // 4881221: relax the constraints based on JSR202 spec 4041 legal = verify_unqualified_name(bytes, length, LegalField); 4042 } 4043 } 4044 4045 if (!legal) { 4046 ResourceMark rm(THREAD); 4047 Exceptions::fthrow( 4048 THREAD_AND_LOCATION, 4049 vmSymbolHandles::java_lang_ClassFormatError(), 4050 "Illegal field name \"%s\" in class %s", bytes, 4051 _class_name->as_C_string() 4052 ); 4053 return; 4054 } 4055 } 4056 4057 // Checks if name is a legal method name. 4058 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) { 4059 if (!_need_verify || _relax_verify) { return; } 4060 4061 assert(!name.is_null(), "method name is null"); 4062 char buf[fixed_buffer_size]; 4063 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4064 unsigned int length = name->utf8_length(); 4065 bool legal = false; 4066 4067 if (length > 0) { 4068 if (bytes[0] == '<') { 4069 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 4070 legal = true; 4071 } 4072 } else if (_major_version < JAVA_1_5_VERSION) { 4073 char* p; 4074 p = skip_over_field_name(bytes, false, length); 4075 legal = (p != NULL) && ((p - bytes) == (int)length); 4076 } else { 4077 // 4881221: relax the constraints based on JSR202 spec 4078 legal = verify_unqualified_name(bytes, length, LegalMethod); 4079 } 4080 } 4081 4082 if (!legal) { 4083 ResourceMark rm(THREAD); 4084 Exceptions::fthrow( 4085 THREAD_AND_LOCATION, 4086 vmSymbolHandles::java_lang_ClassFormatError(), 4087 "Illegal method name \"%s\" in class %s", bytes, 4088 _class_name->as_C_string() 4089 ); 4090 return; 4091 } 4092 } 4093 4094 4095 // Checks if signature is a legal field signature. 4096 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) { 4097 if (!_need_verify) { return; } 4098 4099 char buf[fixed_buffer_size]; 4100 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4101 unsigned int length = signature->utf8_length(); 4102 char* p = skip_over_field_signature(bytes, false, length, CHECK); 4103 4104 if (p == NULL || (p - bytes) != (int)length) { 4105 throwIllegalSignature("Field", name, signature, CHECK); 4106 } 4107 } 4108 4109 // Checks if signature is a legal method signature. 4110 // Returns number of parameters 4111 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) { 4112 if (!_need_verify) { 4113 // make sure caller's args_size will be less than 0 even for non-static 4114 // method so it will be recomputed in compute_size_of_parameters(). 4115 return -2; 4116 } 4117 4118 unsigned int args_size = 0; 4119 char buf[fixed_buffer_size]; 4120 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4121 unsigned int length = signature->utf8_length(); 4122 char* nextp; 4123 4124 // The first character must be a '(' 4125 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 4126 length--; 4127 // Skip over legal field signatures 4128 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4129 while ((length > 0) && (nextp != NULL)) { 4130 args_size++; 4131 if (p[0] == 'J' || p[0] == 'D') { 4132 args_size++; 4133 } 4134 length -= nextp - p; 4135 p = nextp; 4136 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4137 } 4138 // The first non-signature thing better be a ')' 4139 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 4140 length--; 4141 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 4142 // All internal methods must return void 4143 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 4144 return args_size; 4145 } 4146 } else { 4147 // Now we better just have a return value 4148 nextp = skip_over_field_signature(p, true, length, CHECK_0); 4149 if (nextp && ((int)length == (nextp - p))) { 4150 return args_size; 4151 } 4152 } 4153 } 4154 } 4155 // Report error 4156 throwIllegalSignature("Method", name, signature, CHECK_0); 4157 return 0; 4158 } 4159 4160 4161 // Unqualified names may not contain the characters '.', ';', or '/'. 4162 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>. 4163 // Note that method names may not be <init> or <clinit> in this method. 4164 // Because these names have been checked as special cases before calling this method 4165 // in verify_legal_method_name. 4166 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) { 4167 jchar ch; 4168 4169 for (char* p = name; p != name + length; ) { 4170 ch = *p; 4171 if (ch < 128) { 4172 p++; 4173 if (ch == '.' || ch == ';') { 4174 return false; // do not permit '.' or ';' 4175 } 4176 if (type != LegalClass && ch == '/') { 4177 return false; // do not permit '/' unless it's class name 4178 } 4179 if (type == LegalMethod && (ch == '<' || ch == '>')) { 4180 return false; // do not permit '<' or '>' in method names 4181 } 4182 } else { 4183 char* tmp_p = UTF8::next(p, &ch); 4184 p = tmp_p; 4185 } 4186 } 4187 return true; 4188 } 4189 4190 4191 // Take pointer to a string. Skip over the longest part of the string that could 4192 // be taken as a fieldname. Allow '/' if slash_ok is true. 4193 // Return a pointer to just past the fieldname. 4194 // Return NULL if no fieldname at all was found, or in the case of slash_ok 4195 // being true, we saw consecutive slashes (meaning we were looking for a 4196 // qualified path but found something that was badly-formed). 4197 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 4198 char* p; 4199 jchar ch; 4200 jboolean last_is_slash = false; 4201 jboolean not_first_ch = false; 4202 4203 for (p = name; p != name + length; not_first_ch = true) { 4204 char* old_p = p; 4205 ch = *p; 4206 if (ch < 128) { 4207 p++; 4208 // quick check for ascii 4209 if ((ch >= 'a' && ch <= 'z') || 4210 (ch >= 'A' && ch <= 'Z') || 4211 (ch == '_' || ch == '$') || 4212 (not_first_ch && ch >= '0' && ch <= '9')) { 4213 last_is_slash = false; 4214 continue; 4215 } 4216 if (slash_ok && ch == '/') { 4217 if (last_is_slash) { 4218 return NULL; // Don't permit consecutive slashes 4219 } 4220 last_is_slash = true; 4221 continue; 4222 } 4223 } else { 4224 jint unicode_ch; 4225 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4226 p = tmp_p; 4227 last_is_slash = false; 4228 // Check if ch is Java identifier start or is Java identifier part 4229 // 4672820: call java.lang.Character methods directly without generating separate tables. 4230 EXCEPTION_MARK; 4231 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 4232 4233 // return value 4234 JavaValue result(T_BOOLEAN); 4235 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 4236 JavaCallArguments args; 4237 args.push_int(unicode_ch); 4238 4239 // public static boolean isJavaIdentifierStart(char ch); 4240 JavaCalls::call_static(&result, 4241 klass, 4242 vmSymbolHandles::isJavaIdentifierStart_name(), 4243 vmSymbolHandles::int_bool_signature(), 4244 &args, 4245 THREAD); 4246 4247 if (HAS_PENDING_EXCEPTION) { 4248 CLEAR_PENDING_EXCEPTION; 4249 return 0; 4250 } 4251 if (result.get_jboolean()) { 4252 continue; 4253 } 4254 4255 if (not_first_ch) { 4256 // public static boolean isJavaIdentifierPart(char ch); 4257 JavaCalls::call_static(&result, 4258 klass, 4259 vmSymbolHandles::isJavaIdentifierPart_name(), 4260 vmSymbolHandles::int_bool_signature(), 4261 &args, 4262 THREAD); 4263 4264 if (HAS_PENDING_EXCEPTION) { 4265 CLEAR_PENDING_EXCEPTION; 4266 return 0; 4267 } 4268 4269 if (result.get_jboolean()) { 4270 continue; 4271 } 4272 } 4273 } 4274 return (not_first_ch) ? old_p : NULL; 4275 } 4276 return (not_first_ch) ? p : NULL; 4277 } 4278 4279 4280 // Take pointer to a string. Skip over the longest part of the string that could 4281 // be taken as a field signature. Allow "void" if void_ok. 4282 // Return a pointer to just past the signature. 4283 // Return NULL if no legal signature is found. 4284 char* ClassFileParser::skip_over_field_signature(char* signature, 4285 bool void_ok, 4286 unsigned int length, 4287 TRAPS) { 4288 unsigned int array_dim = 0; 4289 while (length > 0) { 4290 switch (signature[0]) { 4291 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 4292 case JVM_SIGNATURE_BOOLEAN: 4293 case JVM_SIGNATURE_BYTE: 4294 case JVM_SIGNATURE_CHAR: 4295 case JVM_SIGNATURE_SHORT: 4296 case JVM_SIGNATURE_INT: 4297 case JVM_SIGNATURE_FLOAT: 4298 case JVM_SIGNATURE_LONG: 4299 case JVM_SIGNATURE_DOUBLE: 4300 return signature + 1; 4301 case JVM_SIGNATURE_CLASS: { 4302 if (_major_version < JAVA_1_5_VERSION) { 4303 // Skip over the class name if one is there 4304 char* p = skip_over_field_name(signature + 1, true, --length); 4305 4306 // The next character better be a semicolon 4307 if (p && (p - signature) > 1 && p[0] == ';') { 4308 return p + 1; 4309 } 4310 } else { 4311 // 4900761: For class version > 48, any unicode is allowed in class name. 4312 length--; 4313 signature++; 4314 while (length > 0 && signature[0] != ';') { 4315 if (signature[0] == '.') { 4316 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 4317 } 4318 length--; 4319 signature++; 4320 } 4321 if (signature[0] == ';') { return signature + 1; } 4322 } 4323 4324 return NULL; 4325 } 4326 case JVM_SIGNATURE_ARRAY: 4327 array_dim++; 4328 if (array_dim > 255) { 4329 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4330 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 4331 } 4332 // The rest of what's there better be a legal signature 4333 signature++; 4334 length--; 4335 void_ok = false; 4336 break; 4337 4338 default: 4339 return NULL; 4340 } 4341 } 4342 return NULL; 4343 }