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