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 fatal1("bad constant pool tag value %u", cp->tag_at(index).value()); 338 ShouldNotReachHere(); 339 break; 340 } // end of switch 341 } // end of for 342 343 if (_cp_patches != NULL) { 344 // need to treat this_class specially... 345 assert(AnonymousClasses, ""); 346 int this_class_index; 347 { 348 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 349 u1* mark = cfs->current(); 350 u2 flags = cfs->get_u2_fast(); 351 this_class_index = cfs->get_u2_fast(); 352 cfs->set_current(mark); // revert to mark 353 } 354 355 for (index = 1; index < length; index++) { // Index 0 is unused 356 if (has_cp_patch_at(index)) { 357 guarantee_property(index != this_class_index, 358 "Illegal constant pool patch to self at %d in class file %s", 359 index, CHECK_(nullHandle)); 360 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 361 } 362 } 363 // Ensure that all the patches have been used. 364 for (index = 0; index < _cp_patches->length(); index++) { 365 guarantee_property(!has_cp_patch_at(index), 366 "Unused constant pool patch at %d in class file %s", 367 index, CHECK_(nullHandle)); 368 } 369 } 370 371 if (!_need_verify) { 372 return cp; 373 } 374 375 // second verification pass - checks the strings are of the right format. 376 // but not yet to the other entries 377 for (index = 1; index < length; index++) { 378 jbyte tag = cp->tag_at(index).value(); 379 switch (tag) { 380 case JVM_CONSTANT_UnresolvedClass: { 381 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index)); 382 // check the name, even if _cp_patches will overwrite it 383 verify_legal_class_name(class_name, CHECK_(nullHandle)); 384 break; 385 } 386 case JVM_CONSTANT_Fieldref: 387 case JVM_CONSTANT_Methodref: 388 case JVM_CONSTANT_InterfaceMethodref: { 389 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 390 // already verified to be utf8 391 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 392 // already verified to be utf8 393 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 394 symbolHandle name(THREAD, cp->symbol_at(name_ref_index)); 395 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index)); 396 if (tag == JVM_CONSTANT_Fieldref) { 397 verify_legal_field_name(name, CHECK_(nullHandle)); 398 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 399 } else { 400 verify_legal_method_name(name, CHECK_(nullHandle)); 401 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 402 if (tag == JVM_CONSTANT_Methodref) { 403 // 4509014: If a class method name begins with '<', it must be "<init>". 404 assert(!name.is_null(), "method name in constant pool is null"); 405 unsigned int name_len = name->utf8_length(); 406 assert(name_len > 0, "bad method name"); // already verified as legal name 407 if (name->byte_at(0) == '<') { 408 if (name() != vmSymbols::object_initializer_name()) { 409 classfile_parse_error( 410 "Bad method name at constant pool index %u in class file %s", 411 name_ref_index, CHECK_(nullHandle)); 412 } 413 } 414 } 415 } 416 break; 417 } 418 } // end of switch 419 } // end of for 420 421 return cp; 422 } 423 424 425 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 426 assert(AnonymousClasses, ""); 427 BasicType patch_type = T_VOID; 428 switch (cp->tag_at(index).value()) { 429 430 case JVM_CONSTANT_UnresolvedClass : 431 // Patching a class means pre-resolving it. 432 // The name in the constant pool is ignored. 433 if (patch->klass() == SystemDictionary::class_klass()) { // %%% java_lang_Class::is_instance 434 guarantee_property(!java_lang_Class::is_primitive(patch()), 435 "Illegal class patch at %d in class file %s", 436 index, CHECK); 437 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch())); 438 } else { 439 guarantee_property(java_lang_String::is_instance(patch()), 440 "Illegal class patch at %d in class file %s", 441 index, CHECK); 442 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK); 443 cp->unresolved_klass_at_put(index, name()); 444 } 445 break; 446 447 case JVM_CONSTANT_UnresolvedString : 448 // Patching a string means pre-resolving it. 449 // The spelling in the constant pool is ignored. 450 // The constant reference may be any object whatever. 451 // If it is not a real interned string, the constant is referred 452 // to as a "pseudo-string", and must be presented to the CP 453 // explicitly, because it may require scavenging. 454 cp->pseudo_string_at_put(index, patch()); 455 break; 456 457 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 458 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 459 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 460 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 461 patch_prim: 462 { 463 jvalue value; 464 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 465 guarantee_property(value_type == patch_type, 466 "Illegal primitive patch at %d in class file %s", 467 index, CHECK); 468 switch (value_type) { 469 case T_INT: cp->int_at_put(index, value.i); break; 470 case T_FLOAT: cp->float_at_put(index, value.f); break; 471 case T_LONG: cp->long_at_put(index, value.j); break; 472 case T_DOUBLE: cp->double_at_put(index, value.d); break; 473 default: assert(false, ""); 474 } 475 } 476 break; 477 478 default: 479 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 480 guarantee_property(!has_cp_patch_at(index), 481 "Illegal unexpected patch at %d in class file %s", 482 index, CHECK); 483 return; 484 } 485 486 // On fall-through, mark the patch as used. 487 clear_cp_patch_at(index); 488 } 489 490 491 492 class NameSigHash: public ResourceObj { 493 public: 494 symbolOop _name; // name 495 symbolOop _sig; // signature 496 NameSigHash* _next; // Next entry in hash table 497 }; 498 499 500 #define HASH_ROW_SIZE 256 501 502 unsigned int hash(symbolOop name, symbolOop sig) { 503 unsigned int raw_hash = 0; 504 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 505 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 506 507 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 508 } 509 510 511 void initialize_hashtable(NameSigHash** table) { 512 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 513 } 514 515 // Return false if the name/sig combination is found in table. 516 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 517 // The old format checker uses heap sort to find duplicates. 518 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 519 // of table since we don't expect symbolOop's to move. 520 bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) { 521 assert(name != NULL, "name in constant pool is NULL"); 522 523 // First lookup for duplicates 524 int index = hash(name, sig); 525 NameSigHash* entry = table[index]; 526 while (entry != NULL) { 527 if (entry->_name == name && entry->_sig == sig) { 528 return false; 529 } 530 entry = entry->_next; 531 } 532 533 // No duplicate is found, allocate a new entry and fill it. 534 entry = new NameSigHash(); 535 entry->_name = name; 536 entry->_sig = sig; 537 538 // Insert into hash table 539 entry->_next = table[index]; 540 table[index] = entry; 541 542 return true; 543 } 544 545 546 objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp, 547 int length, 548 Handle class_loader, 549 Handle protection_domain, 550 symbolHandle class_name, 551 TRAPS) { 552 ClassFileStream* cfs = stream(); 553 assert(length > 0, "only called for length>0"); 554 objArrayHandle nullHandle; 555 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 556 objArrayHandle interfaces (THREAD, interface_oop); 557 558 int index; 559 for (index = 0; index < length; index++) { 560 u2 interface_index = cfs->get_u2(CHECK_(nullHandle)); 561 KlassHandle interf; 562 check_property( 563 valid_cp_range(interface_index, cp->length()) && 564 is_klass_reference(cp, interface_index), 565 "Interface name has bad constant pool index %u in class file %s", 566 interface_index, CHECK_(nullHandle)); 567 if (cp->tag_at(interface_index).is_klass()) { 568 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index)); 569 } else { 570 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index)); 571 572 // Don't need to check legal name because it's checked when parsing constant pool. 573 // But need to make sure it's not an array type. 574 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 575 "Bad interface name in class file %s", CHECK_(nullHandle)); 576 577 // Call resolve_super so classcircularity is checked 578 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 579 unresolved_klass, class_loader, protection_domain, 580 false, CHECK_(nullHandle)); 581 interf = KlassHandle(THREAD, k); 582 583 if (LinkWellKnownClasses) // my super type is well known to me 584 cp->klass_at_put(interface_index, interf()); // eagerly resolve 585 } 586 587 if (!Klass::cast(interf())->is_interface()) { 588 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle); 589 } 590 interfaces->obj_at_put(index, interf()); 591 } 592 593 if (!_need_verify || length <= 1) { 594 return interfaces; 595 } 596 597 // Check if there's any duplicates in interfaces 598 ResourceMark rm(THREAD); 599 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 600 THREAD, NameSigHash*, HASH_ROW_SIZE); 601 initialize_hashtable(interface_names); 602 bool dup = false; 603 { 604 debug_only(No_Safepoint_Verifier nsv;) 605 for (index = 0; index < length; index++) { 606 klassOop k = (klassOop)interfaces->obj_at(index); 607 symbolOop name = instanceKlass::cast(k)->name(); 608 // If no duplicates, add (name, NULL) in hashtable interface_names. 609 if (!put_after_lookup(name, NULL, interface_names)) { 610 dup = true; 611 break; 612 } 613 } 614 } 615 if (dup) { 616 classfile_parse_error("Duplicate interface name in class file %s", 617 CHECK_(nullHandle)); 618 } 619 620 return interfaces; 621 } 622 623 624 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) { 625 // Make sure the constant pool entry is of a type appropriate to this field 626 guarantee_property( 627 (constantvalue_index > 0 && 628 constantvalue_index < cp->length()), 629 "Bad initial value index %u in ConstantValue attribute in class file %s", 630 constantvalue_index, CHECK); 631 constantTag value_type = cp->tag_at(constantvalue_index); 632 switch ( cp->basic_type_for_signature_at(signature_index) ) { 633 case T_LONG: 634 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 635 break; 636 case T_FLOAT: 637 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 638 break; 639 case T_DOUBLE: 640 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 641 break; 642 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 643 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 644 break; 645 case T_OBJECT: 646 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18) 647 && (value_type.is_string() || value_type.is_unresolved_string())), 648 "Bad string initial value in class file %s", CHECK); 649 break; 650 default: 651 classfile_parse_error( 652 "Unable to set initial value %u in class file %s", 653 constantvalue_index, CHECK); 654 } 655 } 656 657 658 // Parse attributes for a field. 659 void ClassFileParser::parse_field_attributes(constantPoolHandle cp, 660 u2 attributes_count, 661 bool is_static, u2 signature_index, 662 u2* constantvalue_index_addr, 663 bool* is_synthetic_addr, 664 u2* generic_signature_index_addr, 665 typeArrayHandle* field_annotations, 666 TRAPS) { 667 ClassFileStream* cfs = stream(); 668 assert(attributes_count > 0, "length should be greater than 0"); 669 u2 constantvalue_index = 0; 670 u2 generic_signature_index = 0; 671 bool is_synthetic = false; 672 u1* runtime_visible_annotations = NULL; 673 int runtime_visible_annotations_length = 0; 674 u1* runtime_invisible_annotations = NULL; 675 int runtime_invisible_annotations_length = 0; 676 while (attributes_count--) { 677 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 678 u2 attribute_name_index = cfs->get_u2_fast(); 679 u4 attribute_length = cfs->get_u4_fast(); 680 check_property(valid_cp_range(attribute_name_index, cp->length()) && 681 cp->tag_at(attribute_name_index).is_utf8(), 682 "Invalid field attribute index %u in class file %s", 683 attribute_name_index, 684 CHECK); 685 symbolOop attribute_name = cp->symbol_at(attribute_name_index); 686 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 687 // ignore if non-static 688 if (constantvalue_index != 0) { 689 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 690 } 691 check_property( 692 attribute_length == 2, 693 "Invalid ConstantValue field attribute length %u in class file %s", 694 attribute_length, CHECK); 695 constantvalue_index = cfs->get_u2(CHECK); 696 if (_need_verify) { 697 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK); 698 } 699 } else if (attribute_name == vmSymbols::tag_synthetic()) { 700 if (attribute_length != 0) { 701 classfile_parse_error( 702 "Invalid Synthetic field attribute length %u in class file %s", 703 attribute_length, CHECK); 704 } 705 is_synthetic = true; 706 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 707 if (attribute_length != 0) { 708 classfile_parse_error( 709 "Invalid Deprecated field attribute length %u in class file %s", 710 attribute_length, CHECK); 711 } 712 } else if (_major_version >= JAVA_1_5_VERSION) { 713 if (attribute_name == vmSymbols::tag_signature()) { 714 if (attribute_length != 2) { 715 classfile_parse_error( 716 "Wrong size %u for field's Signature attribute in class file %s", 717 attribute_length, CHECK); 718 } 719 generic_signature_index = cfs->get_u2(CHECK); 720 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 721 runtime_visible_annotations_length = attribute_length; 722 runtime_visible_annotations = cfs->get_u1_buffer(); 723 assert(runtime_visible_annotations != NULL, "null visible annotations"); 724 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 725 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 726 runtime_invisible_annotations_length = attribute_length; 727 runtime_invisible_annotations = cfs->get_u1_buffer(); 728 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 729 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 730 } else { 731 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 732 } 733 } else { 734 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 735 } 736 } 737 738 *constantvalue_index_addr = constantvalue_index; 739 *is_synthetic_addr = is_synthetic; 740 *generic_signature_index_addr = generic_signature_index; 741 *field_annotations = assemble_annotations(runtime_visible_annotations, 742 runtime_visible_annotations_length, 743 runtime_invisible_annotations, 744 runtime_invisible_annotations_length, 745 CHECK); 746 return; 747 } 748 749 750 // Field allocation types. Used for computing field offsets. 751 752 enum FieldAllocationType { 753 STATIC_OOP, // Oops 754 STATIC_BYTE, // Boolean, Byte, char 755 STATIC_SHORT, // shorts 756 STATIC_WORD, // ints 757 STATIC_DOUBLE, // long or double 758 STATIC_ALIGNED_DOUBLE,// aligned long or double 759 NONSTATIC_OOP, 760 NONSTATIC_BYTE, 761 NONSTATIC_SHORT, 762 NONSTATIC_WORD, 763 NONSTATIC_DOUBLE, 764 NONSTATIC_ALIGNED_DOUBLE 765 }; 766 767 768 struct FieldAllocationCount { 769 unsigned int static_oop_count; 770 unsigned int static_byte_count; 771 unsigned int static_short_count; 772 unsigned int static_word_count; 773 unsigned int static_double_count; 774 unsigned int nonstatic_oop_count; 775 unsigned int nonstatic_byte_count; 776 unsigned int nonstatic_short_count; 777 unsigned int nonstatic_word_count; 778 unsigned int nonstatic_double_count; 779 }; 780 781 typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface, 782 struct FieldAllocationCount *fac, 783 objArrayHandle* fields_annotations, TRAPS) { 784 ClassFileStream* cfs = stream(); 785 typeArrayHandle nullHandle; 786 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 787 u2 length = cfs->get_u2_fast(); 788 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index] 789 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle)); 790 typeArrayHandle fields(THREAD, new_fields); 791 792 int index = 0; 793 typeArrayHandle field_annotations; 794 for (int n = 0; n < length; n++) { 795 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 796 797 AccessFlags access_flags; 798 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 799 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle)); 800 access_flags.set_flags(flags); 801 802 u2 name_index = cfs->get_u2_fast(); 803 int cp_size = cp->length(); 804 check_property( 805 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), 806 "Invalid constant pool index %u for field name in class file %s", 807 name_index, CHECK_(nullHandle)); 808 symbolHandle name(THREAD, cp->symbol_at(name_index)); 809 verify_legal_field_name(name, CHECK_(nullHandle)); 810 811 u2 signature_index = cfs->get_u2_fast(); 812 check_property( 813 valid_cp_range(signature_index, cp_size) && 814 cp->tag_at(signature_index).is_utf8(), 815 "Invalid constant pool index %u for field signature in class file %s", 816 signature_index, CHECK_(nullHandle)); 817 symbolHandle sig(THREAD, cp->symbol_at(signature_index)); 818 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 819 820 u2 constantvalue_index = 0; 821 bool is_synthetic = false; 822 u2 generic_signature_index = 0; 823 bool is_static = access_flags.is_static(); 824 825 u2 attributes_count = cfs->get_u2_fast(); 826 if (attributes_count > 0) { 827 parse_field_attributes(cp, attributes_count, is_static, signature_index, 828 &constantvalue_index, &is_synthetic, 829 &generic_signature_index, &field_annotations, 830 CHECK_(nullHandle)); 831 if (field_annotations.not_null()) { 832 if (fields_annotations->is_null()) { 833 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 834 *fields_annotations = objArrayHandle(THREAD, md); 835 } 836 (*fields_annotations)->obj_at_put(n, field_annotations()); 837 } 838 if (is_synthetic) { 839 access_flags.set_is_synthetic(); 840 } 841 } 842 843 fields->short_at_put(index++, access_flags.as_short()); 844 fields->short_at_put(index++, name_index); 845 fields->short_at_put(index++, signature_index); 846 fields->short_at_put(index++, constantvalue_index); 847 848 // Remember how many oops we encountered and compute allocation type 849 BasicType type = cp->basic_type_for_signature_at(signature_index); 850 FieldAllocationType atype; 851 if ( is_static ) { 852 switch ( type ) { 853 case T_BOOLEAN: 854 case T_BYTE: 855 fac->static_byte_count++; 856 atype = STATIC_BYTE; 857 break; 858 case T_LONG: 859 case T_DOUBLE: 860 if (Universe::field_type_should_be_aligned(type)) { 861 atype = STATIC_ALIGNED_DOUBLE; 862 } else { 863 atype = STATIC_DOUBLE; 864 } 865 fac->static_double_count++; 866 break; 867 case T_CHAR: 868 case T_SHORT: 869 fac->static_short_count++; 870 atype = STATIC_SHORT; 871 break; 872 case T_FLOAT: 873 case T_INT: 874 fac->static_word_count++; 875 atype = STATIC_WORD; 876 break; 877 case T_ARRAY: 878 case T_OBJECT: 879 fac->static_oop_count++; 880 atype = STATIC_OOP; 881 break; 882 case T_ADDRESS: 883 case T_VOID: 884 default: 885 assert(0, "bad field type"); 886 } 887 } else { 888 switch ( type ) { 889 case T_BOOLEAN: 890 case T_BYTE: 891 fac->nonstatic_byte_count++; 892 atype = NONSTATIC_BYTE; 893 break; 894 case T_LONG: 895 case T_DOUBLE: 896 if (Universe::field_type_should_be_aligned(type)) { 897 atype = NONSTATIC_ALIGNED_DOUBLE; 898 } else { 899 atype = NONSTATIC_DOUBLE; 900 } 901 fac->nonstatic_double_count++; 902 break; 903 case T_CHAR: 904 case T_SHORT: 905 fac->nonstatic_short_count++; 906 atype = NONSTATIC_SHORT; 907 break; 908 case T_FLOAT: 909 case T_INT: 910 fac->nonstatic_word_count++; 911 atype = NONSTATIC_WORD; 912 break; 913 case T_ARRAY: 914 case T_OBJECT: 915 fac->nonstatic_oop_count++; 916 atype = NONSTATIC_OOP; 917 break; 918 case T_ADDRESS: 919 case T_VOID: 920 default: 921 assert(0, "bad field type"); 922 } 923 } 924 925 // The correct offset is computed later (all oop fields will be located together) 926 // We temporarily store the allocation type in the offset field 927 fields->short_at_put(index++, atype); 928 fields->short_at_put(index++, 0); // Clear out high word of byte offset 929 fields->short_at_put(index++, generic_signature_index); 930 } 931 932 if (_need_verify && length > 1) { 933 // Check duplicated fields 934 ResourceMark rm(THREAD); 935 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 936 THREAD, NameSigHash*, HASH_ROW_SIZE); 937 initialize_hashtable(names_and_sigs); 938 bool dup = false; 939 { 940 debug_only(No_Safepoint_Verifier nsv;) 941 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) { 942 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); 943 symbolOop name = cp->symbol_at(name_index); 944 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); 945 symbolOop sig = cp->symbol_at(sig_index); 946 // If no duplicates, add name/signature in hashtable names_and_sigs. 947 if (!put_after_lookup(name, sig, names_and_sigs)) { 948 dup = true; 949 break; 950 } 951 } 952 } 953 if (dup) { 954 classfile_parse_error("Duplicate field name&signature in class file %s", 955 CHECK_(nullHandle)); 956 } 957 } 958 959 return fields; 960 } 961 962 963 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 964 while (length-- > 0) { 965 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 966 } 967 } 968 969 970 typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length, 971 u4 exception_table_length, 972 constantPoolHandle cp, 973 TRAPS) { 974 ClassFileStream* cfs = stream(); 975 typeArrayHandle nullHandle; 976 977 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index] 978 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle)); 979 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh); 980 981 int index = 0; 982 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index 983 for (unsigned int i = 0; i < exception_table_length; i++) { 984 u2 start_pc = cfs->get_u2_fast(); 985 u2 end_pc = cfs->get_u2_fast(); 986 u2 handler_pc = cfs->get_u2_fast(); 987 u2 catch_type_index = cfs->get_u2_fast(); 988 // Will check legal target after parsing code array in verifier. 989 if (_need_verify) { 990 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 991 "Illegal exception table range in class file %s", CHECK_(nullHandle)); 992 guarantee_property(handler_pc < code_length, 993 "Illegal exception table handler in class file %s", CHECK_(nullHandle)); 994 if (catch_type_index != 0) { 995 guarantee_property(valid_cp_range(catch_type_index, cp->length()) && 996 is_klass_reference(cp, catch_type_index), 997 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle)); 998 } 999 } 1000 exception_handlers->int_at_put(index++, start_pc); 1001 exception_handlers->int_at_put(index++, end_pc); 1002 exception_handlers->int_at_put(index++, handler_pc); 1003 exception_handlers->int_at_put(index++, catch_type_index); 1004 } 1005 return exception_handlers; 1006 } 1007 1008 void ClassFileParser::parse_linenumber_table( 1009 u4 code_attribute_length, u4 code_length, 1010 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1011 ClassFileStream* cfs = stream(); 1012 unsigned int num_entries = cfs->get_u2(CHECK); 1013 1014 // Each entry is a u2 start_pc, and a u2 line_number 1015 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1016 1017 // Verify line number attribute and table length 1018 check_property( 1019 code_attribute_length == sizeof(u2) + length_in_bytes, 1020 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1021 1022 cfs->guarantee_more(length_in_bytes, CHECK); 1023 1024 if ((*write_stream) == NULL) { 1025 if (length_in_bytes > fixed_buffer_size) { 1026 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1027 } else { 1028 (*write_stream) = new CompressedLineNumberWriteStream( 1029 linenumbertable_buffer, fixed_buffer_size); 1030 } 1031 } 1032 1033 while (num_entries-- > 0) { 1034 u2 bci = cfs->get_u2_fast(); // start_pc 1035 u2 line = cfs->get_u2_fast(); // line_number 1036 guarantee_property(bci < code_length, 1037 "Invalid pc in LineNumberTable in class file %s", CHECK); 1038 (*write_stream)->write_pair(bci, line); 1039 } 1040 } 1041 1042 1043 // Class file LocalVariableTable elements. 1044 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1045 public: 1046 u2 start_bci; 1047 u2 length; 1048 u2 name_cp_index; 1049 u2 descriptor_cp_index; 1050 u2 slot; 1051 }; 1052 1053 1054 class LVT_Hash: public CHeapObj { 1055 public: 1056 LocalVariableTableElement *_elem; // element 1057 LVT_Hash* _next; // Next entry in hash table 1058 }; 1059 1060 unsigned int hash(LocalVariableTableElement *elem) { 1061 unsigned int raw_hash = elem->start_bci; 1062 1063 raw_hash = elem->length + raw_hash * 37; 1064 raw_hash = elem->name_cp_index + raw_hash * 37; 1065 raw_hash = elem->slot + raw_hash * 37; 1066 1067 return raw_hash % HASH_ROW_SIZE; 1068 } 1069 1070 void initialize_hashtable(LVT_Hash** table) { 1071 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1072 table[i] = NULL; 1073 } 1074 } 1075 1076 void clear_hashtable(LVT_Hash** table) { 1077 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1078 LVT_Hash* current = table[i]; 1079 LVT_Hash* next; 1080 while (current != NULL) { 1081 next = current->_next; 1082 current->_next = NULL; 1083 delete(current); 1084 current = next; 1085 } 1086 table[i] = NULL; 1087 } 1088 } 1089 1090 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1091 LVT_Hash* entry = table[index]; 1092 1093 /* 1094 * 3-tuple start_bci/length/slot has to be unique key, 1095 * so the following comparison seems to be redundant: 1096 * && elem->name_cp_index == entry->_elem->name_cp_index 1097 */ 1098 while (entry != NULL) { 1099 if (elem->start_bci == entry->_elem->start_bci 1100 && elem->length == entry->_elem->length 1101 && elem->name_cp_index == entry->_elem->name_cp_index 1102 && elem->slot == entry->_elem->slot 1103 ) { 1104 return entry; 1105 } 1106 entry = entry->_next; 1107 } 1108 return NULL; 1109 } 1110 1111 // Return false if the local variable is found in table. 1112 // Return true if no duplicate is found. 1113 // And local variable is added as a new entry in table. 1114 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1115 // First lookup for duplicates 1116 int index = hash(elem); 1117 LVT_Hash* entry = LVT_lookup(elem, index, table); 1118 1119 if (entry != NULL) { 1120 return false; 1121 } 1122 // No duplicate is found, allocate a new entry and fill it. 1123 if ((entry = new LVT_Hash()) == NULL) { 1124 return false; 1125 } 1126 entry->_elem = elem; 1127 1128 // Insert into hash table 1129 entry->_next = table[index]; 1130 table[index] = entry; 1131 1132 return true; 1133 } 1134 1135 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1136 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1137 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1138 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1139 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1140 lvt->signature_cp_index = 0; 1141 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1142 } 1143 1144 // Function is used to parse both attributes: 1145 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1146 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1147 u2 max_locals, 1148 u4 code_attribute_length, 1149 constantPoolHandle cp, 1150 u2* localvariable_table_length, 1151 bool isLVTT, 1152 TRAPS) { 1153 ClassFileStream* cfs = stream(); 1154 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1155 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1156 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1157 // Verify local variable table attribute has right length 1158 if (_need_verify) { 1159 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1160 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1161 } 1162 u2* localvariable_table_start = cfs->get_u2_buffer(); 1163 assert(localvariable_table_start != NULL, "null local variable table"); 1164 if (!_need_verify) { 1165 cfs->skip_u2_fast(size); 1166 } else { 1167 cfs->guarantee_more(size * 2, CHECK_NULL); 1168 for(int i = 0; i < (*localvariable_table_length); i++) { 1169 u2 start_pc = cfs->get_u2_fast(); 1170 u2 length = cfs->get_u2_fast(); 1171 u2 name_index = cfs->get_u2_fast(); 1172 u2 descriptor_index = cfs->get_u2_fast(); 1173 u2 index = cfs->get_u2_fast(); 1174 // Assign to a u4 to avoid overflow 1175 u4 end_pc = (u4)start_pc + (u4)length; 1176 1177 if (start_pc >= code_length) { 1178 classfile_parse_error( 1179 "Invalid start_pc %u in %s in class file %s", 1180 start_pc, tbl_name, CHECK_NULL); 1181 } 1182 if (end_pc > code_length) { 1183 classfile_parse_error( 1184 "Invalid length %u in %s in class file %s", 1185 length, tbl_name, CHECK_NULL); 1186 } 1187 int cp_size = cp->length(); 1188 guarantee_property( 1189 valid_cp_range(name_index, cp_size) && 1190 cp->tag_at(name_index).is_utf8(), 1191 "Name index %u in %s has bad constant type in class file %s", 1192 name_index, tbl_name, CHECK_NULL); 1193 guarantee_property( 1194 valid_cp_range(descriptor_index, cp_size) && 1195 cp->tag_at(descriptor_index).is_utf8(), 1196 "Signature index %u in %s has bad constant type in class file %s", 1197 descriptor_index, tbl_name, CHECK_NULL); 1198 1199 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1200 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index)); 1201 verify_legal_field_name(name, CHECK_NULL); 1202 u2 extra_slot = 0; 1203 if (!isLVTT) { 1204 verify_legal_field_signature(name, sig, CHECK_NULL); 1205 1206 // 4894874: check special cases for double and long local variables 1207 if (sig() == vmSymbols::type_signature(T_DOUBLE) || 1208 sig() == vmSymbols::type_signature(T_LONG)) { 1209 extra_slot = 1; 1210 } 1211 } 1212 guarantee_property((index + extra_slot) < max_locals, 1213 "Invalid index %u in %s in class file %s", 1214 index, tbl_name, CHECK_NULL); 1215 } 1216 } 1217 return localvariable_table_start; 1218 } 1219 1220 1221 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1222 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) { 1223 ClassFileStream* cfs = stream(); 1224 u2 index = 0; // index in the array with long/double occupying two slots 1225 u4 i1 = *u1_index; 1226 u4 i2 = *u2_index + 1; 1227 for(int i = 0; i < array_length; i++) { 1228 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1229 index++; 1230 if (tag == ITEM_Long || tag == ITEM_Double) { 1231 index++; 1232 } else if (tag == ITEM_Object) { 1233 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1234 guarantee_property(valid_cp_range(class_index, cp->length()) && 1235 is_klass_reference(cp, class_index), 1236 "Bad class index %u in StackMap in class file %s", 1237 class_index, CHECK); 1238 } else if (tag == ITEM_Uninitialized) { 1239 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1240 guarantee_property( 1241 offset < code_length, 1242 "Bad uninitialized type offset %u in StackMap in class file %s", 1243 offset, CHECK); 1244 } else { 1245 guarantee_property( 1246 tag <= (u1)ITEM_Uninitialized, 1247 "Unknown variable type %u in StackMap in class file %s", 1248 tag, CHECK); 1249 } 1250 } 1251 u2_array[*u2_index] = index; 1252 *u1_index = i1; 1253 *u2_index = i2; 1254 } 1255 1256 typeArrayOop ClassFileParser::parse_stackmap_table( 1257 u4 code_attribute_length, TRAPS) { 1258 if (code_attribute_length == 0) 1259 return NULL; 1260 1261 ClassFileStream* cfs = stream(); 1262 u1* stackmap_table_start = cfs->get_u1_buffer(); 1263 assert(stackmap_table_start != NULL, "null stackmap table"); 1264 1265 // check code_attribute_length first 1266 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1267 1268 if (!_need_verify && !DumpSharedSpaces) { 1269 return NULL; 1270 } 1271 1272 typeArrayOop stackmap_data = 1273 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL); 1274 1275 stackmap_data->set_length(code_attribute_length); 1276 memcpy((void*)stackmap_data->byte_at_addr(0), 1277 (void*)stackmap_table_start, code_attribute_length); 1278 return stackmap_data; 1279 } 1280 1281 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1282 u4 method_attribute_length, 1283 constantPoolHandle cp, TRAPS) { 1284 ClassFileStream* cfs = stream(); 1285 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1286 *checked_exceptions_length = cfs->get_u2_fast(); 1287 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1288 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1289 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1290 if (!_need_verify) { 1291 cfs->skip_u2_fast(size); 1292 } else { 1293 // Verify each value in the checked exception table 1294 u2 checked_exception; 1295 u2 len = *checked_exceptions_length; 1296 cfs->guarantee_more(2 * len, CHECK_NULL); 1297 for (int i = 0; i < len; i++) { 1298 checked_exception = cfs->get_u2_fast(); 1299 check_property( 1300 valid_cp_range(checked_exception, cp->length()) && 1301 is_klass_reference(cp, checked_exception), 1302 "Exception name has bad type at constant pool %u in class file %s", 1303 checked_exception, CHECK_NULL); 1304 } 1305 } 1306 // check exceptions attribute length 1307 if (_need_verify) { 1308 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1309 sizeof(u2) * size), 1310 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1311 } 1312 return checked_exceptions_start; 1313 } 1314 1315 1316 #define MAX_ARGS_SIZE 255 1317 #define MAX_CODE_SIZE 65535 1318 #define INITIAL_MAX_LVT_NUMBER 256 1319 1320 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1321 // attribute is inlined. This is curbersome to avoid since we inline most of the parts in the 1322 // methodOop to save footprint, so we only know the size of the resulting methodOop when the 1323 // entire method attribute is parsed. 1324 // 1325 // The promoted_flags parameter is used to pass relevant access_flags 1326 // from the method back up to the containing klass. These flag values 1327 // are added to klass's access_flags. 1328 1329 methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface, 1330 AccessFlags *promoted_flags, 1331 typeArrayHandle* method_annotations, 1332 typeArrayHandle* method_parameter_annotations, 1333 typeArrayHandle* method_default_annotations, 1334 TRAPS) { 1335 ClassFileStream* cfs = stream(); 1336 methodHandle nullHandle; 1337 ResourceMark rm(THREAD); 1338 // Parse fixed parts 1339 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1340 1341 int flags = cfs->get_u2_fast(); 1342 u2 name_index = cfs->get_u2_fast(); 1343 int cp_size = cp->length(); 1344 check_property( 1345 valid_cp_range(name_index, cp_size) && 1346 cp->tag_at(name_index).is_utf8(), 1347 "Illegal constant pool index %u for method name in class file %s", 1348 name_index, CHECK_(nullHandle)); 1349 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1350 verify_legal_method_name(name, CHECK_(nullHandle)); 1351 1352 u2 signature_index = cfs->get_u2_fast(); 1353 guarantee_property( 1354 valid_cp_range(signature_index, cp_size) && 1355 cp->tag_at(signature_index).is_utf8(), 1356 "Illegal constant pool index %u for method signature in class file %s", 1357 signature_index, CHECK_(nullHandle)); 1358 symbolHandle signature(THREAD, cp->symbol_at(signature_index)); 1359 1360 AccessFlags access_flags; 1361 if (name == vmSymbols::class_initializer_name()) { 1362 // We ignore the access flags for a class initializer. (JVM Spec. p. 116) 1363 flags = JVM_ACC_STATIC; 1364 } else { 1365 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 1366 } 1367 1368 int args_size = -1; // only used when _need_verify is true 1369 if (_need_verify) { 1370 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 1371 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 1372 if (args_size > MAX_ARGS_SIZE) { 1373 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 1374 } 1375 } 1376 1377 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 1378 1379 // Default values for code and exceptions attribute elements 1380 u2 max_stack = 0; 1381 u2 max_locals = 0; 1382 u4 code_length = 0; 1383 u1* code_start = 0; 1384 u2 exception_table_length = 0; 1385 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array()); 1386 u2 checked_exceptions_length = 0; 1387 u2* checked_exceptions_start = NULL; 1388 CompressedLineNumberWriteStream* linenumber_table = NULL; 1389 int linenumber_table_length = 0; 1390 int total_lvt_length = 0; 1391 u2 lvt_cnt = 0; 1392 u2 lvtt_cnt = 0; 1393 bool lvt_allocated = false; 1394 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 1395 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 1396 u2* localvariable_table_length; 1397 u2** localvariable_table_start; 1398 u2* localvariable_type_table_length; 1399 u2** localvariable_type_table_start; 1400 bool parsed_code_attribute = false; 1401 bool parsed_checked_exceptions_attribute = false; 1402 bool parsed_stackmap_attribute = false; 1403 // stackmap attribute - JDK1.5 1404 typeArrayHandle stackmap_data; 1405 u2 generic_signature_index = 0; 1406 u1* runtime_visible_annotations = NULL; 1407 int runtime_visible_annotations_length = 0; 1408 u1* runtime_invisible_annotations = NULL; 1409 int runtime_invisible_annotations_length = 0; 1410 u1* runtime_visible_parameter_annotations = NULL; 1411 int runtime_visible_parameter_annotations_length = 0; 1412 u1* runtime_invisible_parameter_annotations = NULL; 1413 int runtime_invisible_parameter_annotations_length = 0; 1414 u1* annotation_default = NULL; 1415 int annotation_default_length = 0; 1416 1417 // Parse code and exceptions attribute 1418 u2 method_attributes_count = cfs->get_u2_fast(); 1419 while (method_attributes_count--) { 1420 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 1421 u2 method_attribute_name_index = cfs->get_u2_fast(); 1422 u4 method_attribute_length = cfs->get_u4_fast(); 1423 check_property( 1424 valid_cp_range(method_attribute_name_index, cp_size) && 1425 cp->tag_at(method_attribute_name_index).is_utf8(), 1426 "Invalid method attribute name index %u in class file %s", 1427 method_attribute_name_index, CHECK_(nullHandle)); 1428 1429 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index); 1430 if (method_attribute_name == vmSymbols::tag_code()) { 1431 // Parse Code attribute 1432 if (_need_verify) { 1433 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(), 1434 "Code attribute in native or abstract methods in class file %s", 1435 CHECK_(nullHandle)); 1436 } 1437 if (parsed_code_attribute) { 1438 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 1439 } 1440 parsed_code_attribute = true; 1441 1442 // Stack size, locals size, and code size 1443 if (_major_version == 45 && _minor_version <= 2) { 1444 cfs->guarantee_more(4, CHECK_(nullHandle)); 1445 max_stack = cfs->get_u1_fast(); 1446 max_locals = cfs->get_u1_fast(); 1447 code_length = cfs->get_u2_fast(); 1448 } else { 1449 cfs->guarantee_more(8, CHECK_(nullHandle)); 1450 max_stack = cfs->get_u2_fast(); 1451 max_locals = cfs->get_u2_fast(); 1452 code_length = cfs->get_u4_fast(); 1453 } 1454 if (_need_verify) { 1455 guarantee_property(args_size <= max_locals, 1456 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 1457 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 1458 "Invalid method Code length %u in class file %s", 1459 code_length, CHECK_(nullHandle)); 1460 } 1461 // Code pointer 1462 code_start = cfs->get_u1_buffer(); 1463 assert(code_start != NULL, "null code start"); 1464 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 1465 cfs->skip_u1_fast(code_length); 1466 1467 // Exception handler table 1468 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 1469 exception_table_length = cfs->get_u2_fast(); 1470 if (exception_table_length > 0) { 1471 exception_handlers = 1472 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle)); 1473 } 1474 1475 // Parse additional attributes in code attribute 1476 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 1477 u2 code_attributes_count = cfs->get_u2_fast(); 1478 1479 unsigned int calculated_attribute_length = 0; 1480 1481 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 1482 calculated_attribute_length = 1483 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 1484 } else { 1485 // max_stack, locals and length are smaller in pre-version 45.2 classes 1486 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 1487 } 1488 calculated_attribute_length += 1489 code_length + 1490 sizeof(exception_table_length) + 1491 sizeof(code_attributes_count) + 1492 exception_table_length * 1493 ( sizeof(u2) + // start_pc 1494 sizeof(u2) + // end_pc 1495 sizeof(u2) + // handler_pc 1496 sizeof(u2) ); // catch_type_index 1497 1498 while (code_attributes_count--) { 1499 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 1500 u2 code_attribute_name_index = cfs->get_u2_fast(); 1501 u4 code_attribute_length = cfs->get_u4_fast(); 1502 calculated_attribute_length += code_attribute_length + 1503 sizeof(code_attribute_name_index) + 1504 sizeof(code_attribute_length); 1505 check_property(valid_cp_range(code_attribute_name_index, cp_size) && 1506 cp->tag_at(code_attribute_name_index).is_utf8(), 1507 "Invalid code attribute name index %u in class file %s", 1508 code_attribute_name_index, 1509 CHECK_(nullHandle)); 1510 if (LoadLineNumberTables && 1511 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 1512 // Parse and compress line number table 1513 parse_linenumber_table(code_attribute_length, code_length, 1514 &linenumber_table, CHECK_(nullHandle)); 1515 1516 } else if (LoadLocalVariableTables && 1517 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 1518 // Parse local variable table 1519 if (!lvt_allocated) { 1520 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1521 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1522 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1523 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1524 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1525 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1526 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1527 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1528 lvt_allocated = true; 1529 } 1530 if (lvt_cnt == max_lvt_cnt) { 1531 max_lvt_cnt <<= 1; 1532 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 1533 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 1534 } 1535 localvariable_table_start[lvt_cnt] = 1536 parse_localvariable_table(code_length, 1537 max_locals, 1538 code_attribute_length, 1539 cp, 1540 &localvariable_table_length[lvt_cnt], 1541 false, // is not LVTT 1542 CHECK_(nullHandle)); 1543 total_lvt_length += localvariable_table_length[lvt_cnt]; 1544 lvt_cnt++; 1545 } else if (LoadLocalVariableTypeTables && 1546 _major_version >= JAVA_1_5_VERSION && 1547 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 1548 if (!lvt_allocated) { 1549 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1550 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1551 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1552 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1553 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1554 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1555 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1556 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1557 lvt_allocated = true; 1558 } 1559 // Parse local variable type table 1560 if (lvtt_cnt == max_lvtt_cnt) { 1561 max_lvtt_cnt <<= 1; 1562 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 1563 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 1564 } 1565 localvariable_type_table_start[lvtt_cnt] = 1566 parse_localvariable_table(code_length, 1567 max_locals, 1568 code_attribute_length, 1569 cp, 1570 &localvariable_type_table_length[lvtt_cnt], 1571 true, // is LVTT 1572 CHECK_(nullHandle)); 1573 lvtt_cnt++; 1574 } else if (UseSplitVerifier && 1575 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 1576 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 1577 // Stack map is only needed by the new verifier in JDK1.5. 1578 if (parsed_stackmap_attribute) { 1579 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 1580 } 1581 typeArrayOop sm = 1582 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 1583 stackmap_data = typeArrayHandle(THREAD, sm); 1584 parsed_stackmap_attribute = true; 1585 } else { 1586 // Skip unknown attributes 1587 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 1588 } 1589 } 1590 // check method attribute length 1591 if (_need_verify) { 1592 guarantee_property(method_attribute_length == calculated_attribute_length, 1593 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 1594 } 1595 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 1596 // Parse Exceptions attribute 1597 if (parsed_checked_exceptions_attribute) { 1598 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 1599 } 1600 parsed_checked_exceptions_attribute = true; 1601 checked_exceptions_start = 1602 parse_checked_exceptions(&checked_exceptions_length, 1603 method_attribute_length, 1604 cp, CHECK_(nullHandle)); 1605 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 1606 if (method_attribute_length != 0) { 1607 classfile_parse_error( 1608 "Invalid Synthetic method attribute length %u in class file %s", 1609 method_attribute_length, CHECK_(nullHandle)); 1610 } 1611 // Should we check that there hasn't already been a synthetic attribute? 1612 access_flags.set_is_synthetic(); 1613 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1614 if (method_attribute_length != 0) { 1615 classfile_parse_error( 1616 "Invalid Deprecated method attribute length %u in class file %s", 1617 method_attribute_length, CHECK_(nullHandle)); 1618 } 1619 } else if (_major_version >= JAVA_1_5_VERSION) { 1620 if (method_attribute_name == vmSymbols::tag_signature()) { 1621 if (method_attribute_length != 2) { 1622 classfile_parse_error( 1623 "Invalid Signature attribute length %u in class file %s", 1624 method_attribute_length, CHECK_(nullHandle)); 1625 } 1626 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 1627 generic_signature_index = cfs->get_u2_fast(); 1628 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1629 runtime_visible_annotations_length = method_attribute_length; 1630 runtime_visible_annotations = cfs->get_u1_buffer(); 1631 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1632 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 1633 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1634 runtime_invisible_annotations_length = method_attribute_length; 1635 runtime_invisible_annotations = cfs->get_u1_buffer(); 1636 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1637 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 1638 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 1639 runtime_visible_parameter_annotations_length = method_attribute_length; 1640 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 1641 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 1642 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 1643 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 1644 runtime_invisible_parameter_annotations_length = method_attribute_length; 1645 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 1646 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 1647 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 1648 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 1649 annotation_default_length = method_attribute_length; 1650 annotation_default = cfs->get_u1_buffer(); 1651 assert(annotation_default != NULL, "null annotation default"); 1652 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 1653 } else { 1654 // Skip unknown attributes 1655 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1656 } 1657 } else { 1658 // Skip unknown attributes 1659 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1660 } 1661 } 1662 1663 if (linenumber_table != NULL) { 1664 linenumber_table->write_terminator(); 1665 linenumber_table_length = linenumber_table->position(); 1666 } 1667 1668 // Make sure there's at least one Code attribute in non-native/non-abstract method 1669 if (_need_verify) { 1670 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 1671 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 1672 } 1673 1674 // All sizing information for a methodOop is finally available, now create it 1675 methodOop m_oop = oopFactory::new_method( 1676 code_length, access_flags, linenumber_table_length, 1677 total_lvt_length, checked_exceptions_length, 1678 methodOopDesc::IsSafeConc, CHECK_(nullHandle)); 1679 methodHandle m (THREAD, m_oop); 1680 1681 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize); 1682 1683 // Fill in information from fixed part (access_flags already set) 1684 m->set_constants(cp()); 1685 m->set_name_index(name_index); 1686 m->set_signature_index(signature_index); 1687 m->set_generic_signature_index(generic_signature_index); 1688 #ifdef CC_INTERP 1689 // hmm is there a gc issue here?? 1690 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 1691 m->set_result_index(rtf.type()); 1692 #endif 1693 1694 if (args_size >= 0) { 1695 m->set_size_of_parameters(args_size); 1696 } else { 1697 m->compute_size_of_parameters(THREAD); 1698 } 1699 #ifdef ASSERT 1700 if (args_size >= 0) { 1701 m->compute_size_of_parameters(THREAD); 1702 assert(args_size == m->size_of_parameters(), ""); 1703 } 1704 #endif 1705 1706 // Fill in code attribute information 1707 m->set_max_stack(max_stack); 1708 m->set_max_locals(max_locals); 1709 m->constMethod()->set_stackmap_data(stackmap_data()); 1710 1711 /** 1712 * The exception_table field is the flag used to indicate 1713 * that the methodOop and it's associated constMethodOop are partially 1714 * initialized and thus are exempt from pre/post GC verification. Once 1715 * the field is set, the oops are considered fully initialized so make 1716 * sure that the oops can pass verification when this field is set. 1717 */ 1718 m->set_exception_table(exception_handlers()); 1719 1720 // Copy byte codes 1721 m->set_code(code_start); 1722 1723 // Copy line number table 1724 if (linenumber_table != NULL) { 1725 memcpy(m->compressed_linenumber_table(), 1726 linenumber_table->buffer(), linenumber_table_length); 1727 } 1728 1729 // Copy checked exceptions 1730 if (checked_exceptions_length > 0) { 1731 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 1732 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 1733 } 1734 1735 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1736 * 1737 * Rules for LVT's and LVTT's are: 1738 * - There can be any number of LVT's and LVTT's. 1739 * - If there are n LVT's, it is the same as if there was just 1740 * one LVT containing all the entries from the n LVT's. 1741 * - There may be no more than one LVT entry per local variable. 1742 * Two LVT entries are 'equal' if these fields are the same: 1743 * start_pc, length, name, slot 1744 * - There may be no more than one LVTT entry per each LVT entry. 1745 * Each LVTT entry has to match some LVT entry. 1746 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1747 */ 1748 if (total_lvt_length > 0) { 1749 int tbl_no, idx; 1750 1751 promoted_flags->set_has_localvariable_table(); 1752 1753 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1754 initialize_hashtable(lvt_Hash); 1755 1756 // To fill LocalVariableTable in 1757 Classfile_LVT_Element* cf_lvt; 1758 LocalVariableTableElement* lvt = m->localvariable_table_start(); 1759 1760 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1761 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1762 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1763 copy_lvt_element(&cf_lvt[idx], lvt); 1764 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1765 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1766 && _need_verify 1767 && _major_version >= JAVA_1_5_VERSION ) { 1768 clear_hashtable(lvt_Hash); 1769 classfile_parse_error("Duplicated LocalVariableTable attribute " 1770 "entry for '%s' in class file %s", 1771 cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1772 CHECK_(nullHandle)); 1773 } 1774 } 1775 } 1776 1777 // To merge LocalVariableTable and LocalVariableTypeTable 1778 Classfile_LVT_Element* cf_lvtt; 1779 LocalVariableTableElement lvtt_elem; 1780 1781 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1782 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1783 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1784 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1785 int index = hash(&lvtt_elem); 1786 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1787 if (entry == NULL) { 1788 if (_need_verify) { 1789 clear_hashtable(lvt_Hash); 1790 classfile_parse_error("LVTT entry for '%s' in class file %s " 1791 "does not match any LVT entry", 1792 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1793 CHECK_(nullHandle)); 1794 } 1795 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1796 clear_hashtable(lvt_Hash); 1797 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1798 "entry for '%s' in class file %s", 1799 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1800 CHECK_(nullHandle)); 1801 } else { 1802 // to add generic signatures into LocalVariableTable 1803 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1804 } 1805 } 1806 } 1807 clear_hashtable(lvt_Hash); 1808 } 1809 1810 *method_annotations = assemble_annotations(runtime_visible_annotations, 1811 runtime_visible_annotations_length, 1812 runtime_invisible_annotations, 1813 runtime_invisible_annotations_length, 1814 CHECK_(nullHandle)); 1815 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations, 1816 runtime_visible_parameter_annotations_length, 1817 runtime_invisible_parameter_annotations, 1818 runtime_invisible_parameter_annotations_length, 1819 CHECK_(nullHandle)); 1820 *method_default_annotations = assemble_annotations(annotation_default, 1821 annotation_default_length, 1822 NULL, 1823 0, 1824 CHECK_(nullHandle)); 1825 1826 if (name() == vmSymbols::finalize_method_name() && 1827 signature() == vmSymbols::void_method_signature()) { 1828 if (m->is_empty_method()) { 1829 _has_empty_finalizer = true; 1830 } else { 1831 _has_finalizer = true; 1832 } 1833 } 1834 if (name() == vmSymbols::object_initializer_name() && 1835 signature() == vmSymbols::void_method_signature() && 1836 m->is_vanilla_constructor()) { 1837 _has_vanilla_constructor = true; 1838 } 1839 1840 if (EnableMethodHandles && m->is_method_handle_invoke()) { 1841 THROW_MSG_(vmSymbols::java_lang_VirtualMachineError(), 1842 "Method handle invokers must be defined internally to the VM", nullHandle); 1843 } 1844 1845 return m; 1846 } 1847 1848 1849 // The promoted_flags parameter is used to pass relevant access_flags 1850 // from the methods back up to the containing klass. These flag values 1851 // are added to klass's access_flags. 1852 1853 objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface, 1854 AccessFlags* promoted_flags, 1855 bool* has_final_method, 1856 objArrayOop* methods_annotations_oop, 1857 objArrayOop* methods_parameter_annotations_oop, 1858 objArrayOop* methods_default_annotations_oop, 1859 TRAPS) { 1860 ClassFileStream* cfs = stream(); 1861 objArrayHandle nullHandle; 1862 typeArrayHandle method_annotations; 1863 typeArrayHandle method_parameter_annotations; 1864 typeArrayHandle method_default_annotations; 1865 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 1866 u2 length = cfs->get_u2_fast(); 1867 if (length == 0) { 1868 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 1869 } else { 1870 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1871 objArrayHandle methods(THREAD, m); 1872 HandleMark hm(THREAD); 1873 objArrayHandle methods_annotations; 1874 objArrayHandle methods_parameter_annotations; 1875 objArrayHandle methods_default_annotations; 1876 for (int index = 0; index < length; index++) { 1877 methodHandle method = parse_method(cp, is_interface, 1878 promoted_flags, 1879 &method_annotations, 1880 &method_parameter_annotations, 1881 &method_default_annotations, 1882 CHECK_(nullHandle)); 1883 if (method->is_final()) { 1884 *has_final_method = true; 1885 } 1886 methods->obj_at_put(index, method()); 1887 if (method_annotations.not_null()) { 1888 if (methods_annotations.is_null()) { 1889 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1890 methods_annotations = objArrayHandle(THREAD, md); 1891 } 1892 methods_annotations->obj_at_put(index, method_annotations()); 1893 } 1894 if (method_parameter_annotations.not_null()) { 1895 if (methods_parameter_annotations.is_null()) { 1896 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1897 methods_parameter_annotations = objArrayHandle(THREAD, md); 1898 } 1899 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations()); 1900 } 1901 if (method_default_annotations.not_null()) { 1902 if (methods_default_annotations.is_null()) { 1903 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1904 methods_default_annotations = objArrayHandle(THREAD, md); 1905 } 1906 methods_default_annotations->obj_at_put(index, method_default_annotations()); 1907 } 1908 } 1909 if (_need_verify && length > 1) { 1910 // Check duplicated methods 1911 ResourceMark rm(THREAD); 1912 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1913 THREAD, NameSigHash*, HASH_ROW_SIZE); 1914 initialize_hashtable(names_and_sigs); 1915 bool dup = false; 1916 { 1917 debug_only(No_Safepoint_Verifier nsv;) 1918 for (int i = 0; i < length; i++) { 1919 methodOop m = (methodOop)methods->obj_at(i); 1920 // If no duplicates, add name/signature in hashtable names_and_sigs. 1921 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 1922 dup = true; 1923 break; 1924 } 1925 } 1926 } 1927 if (dup) { 1928 classfile_parse_error("Duplicate method name&signature in class file %s", 1929 CHECK_(nullHandle)); 1930 } 1931 } 1932 1933 *methods_annotations_oop = methods_annotations(); 1934 *methods_parameter_annotations_oop = methods_parameter_annotations(); 1935 *methods_default_annotations_oop = methods_default_annotations(); 1936 1937 return methods; 1938 } 1939 } 1940 1941 1942 typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods, 1943 objArrayHandle methods_annotations, 1944 objArrayHandle methods_parameter_annotations, 1945 objArrayHandle methods_default_annotations, 1946 TRAPS) { 1947 typeArrayHandle nullHandle; 1948 int length = methods()->length(); 1949 // If JVMTI original method ordering is enabled we have to 1950 // remember the original class file ordering. 1951 // We temporarily use the vtable_index field in the methodOop to store the 1952 // class file index, so we can read in after calling qsort. 1953 if (JvmtiExport::can_maintain_original_method_order()) { 1954 for (int index = 0; index < length; index++) { 1955 methodOop m = methodOop(methods->obj_at(index)); 1956 assert(!m->valid_vtable_index(), "vtable index should not be set"); 1957 m->set_vtable_index(index); 1958 } 1959 } 1960 // Sort method array by ascending method name (for faster lookups & vtable construction) 1961 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare 1962 methodOopDesc::sort_methods(methods(), 1963 methods_annotations(), 1964 methods_parameter_annotations(), 1965 methods_default_annotations()); 1966 1967 // If JVMTI original method ordering is enabled construct int array remembering the original ordering 1968 if (JvmtiExport::can_maintain_original_method_order()) { 1969 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle)); 1970 typeArrayHandle method_ordering(THREAD, new_ordering); 1971 for (int index = 0; index < length; index++) { 1972 methodOop m = methodOop(methods->obj_at(index)); 1973 int old_index = m->vtable_index(); 1974 assert(old_index >= 0 && old_index < length, "invalid method index"); 1975 method_ordering->int_at_put(index, old_index); 1976 m->set_vtable_index(methodOopDesc::invalid_vtable_index); 1977 } 1978 return method_ordering; 1979 } else { 1980 return typeArrayHandle(THREAD, Universe::the_empty_int_array()); 1981 } 1982 } 1983 1984 1985 void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 1986 ClassFileStream* cfs = stream(); 1987 cfs->guarantee_more(2, CHECK); // sourcefile_index 1988 u2 sourcefile_index = cfs->get_u2_fast(); 1989 check_property( 1990 valid_cp_range(sourcefile_index, cp->length()) && 1991 cp->tag_at(sourcefile_index).is_utf8(), 1992 "Invalid SourceFile attribute at constant pool index %u in class file %s", 1993 sourcefile_index, CHECK); 1994 k->set_source_file_name(cp->symbol_at(sourcefile_index)); 1995 } 1996 1997 1998 1999 void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp, 2000 instanceKlassHandle k, 2001 int length, TRAPS) { 2002 ClassFileStream* cfs = stream(); 2003 u1* sde_buffer = cfs->get_u1_buffer(); 2004 assert(sde_buffer != NULL, "null sde buffer"); 2005 2006 // Don't bother storing it if there is no way to retrieve it 2007 if (JvmtiExport::can_get_source_debug_extension()) { 2008 // Optimistically assume that only 1 byte UTF format is used 2009 // (common case) 2010 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer, 2011 length, CHECK); 2012 k->set_source_debug_extension(sde_symbol); 2013 } 2014 // Got utf8 string, set stream position forward 2015 cfs->skip_u1(length, CHECK); 2016 } 2017 2018 2019 // Inner classes can be static, private or protected (classic VM does this) 2020 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2021 2022 // Return number of classes in the inner classes attribute table 2023 u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2024 ClassFileStream* cfs = stream(); 2025 cfs->guarantee_more(2, CHECK_0); // length 2026 u2 length = cfs->get_u2_fast(); 2027 2028 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags] 2029 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0); 2030 typeArrayHandle inner_classes(THREAD, ic); 2031 int index = 0; 2032 int cp_size = cp->length(); 2033 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2034 for (int n = 0; n < length; n++) { 2035 // Inner class index 2036 u2 inner_class_info_index = cfs->get_u2_fast(); 2037 check_property( 2038 inner_class_info_index == 0 || 2039 (valid_cp_range(inner_class_info_index, cp_size) && 2040 is_klass_reference(cp, inner_class_info_index)), 2041 "inner_class_info_index %u has bad constant type in class file %s", 2042 inner_class_info_index, CHECK_0); 2043 // Outer class index 2044 u2 outer_class_info_index = cfs->get_u2_fast(); 2045 check_property( 2046 outer_class_info_index == 0 || 2047 (valid_cp_range(outer_class_info_index, cp_size) && 2048 is_klass_reference(cp, outer_class_info_index)), 2049 "outer_class_info_index %u has bad constant type in class file %s", 2050 outer_class_info_index, CHECK_0); 2051 // Inner class name 2052 u2 inner_name_index = cfs->get_u2_fast(); 2053 check_property( 2054 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) && 2055 cp->tag_at(inner_name_index).is_utf8()), 2056 "inner_name_index %u has bad constant type in class file %s", 2057 inner_name_index, CHECK_0); 2058 if (_need_verify) { 2059 guarantee_property(inner_class_info_index != outer_class_info_index, 2060 "Class is both outer and inner class in class file %s", CHECK_0); 2061 } 2062 // Access flags 2063 AccessFlags inner_access_flags; 2064 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2065 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2066 // Set abstract bit for old class files for backward compatibility 2067 flags |= JVM_ACC_ABSTRACT; 2068 } 2069 verify_legal_class_modifiers(flags, CHECK_0); 2070 inner_access_flags.set_flags(flags); 2071 2072 inner_classes->short_at_put(index++, inner_class_info_index); 2073 inner_classes->short_at_put(index++, outer_class_info_index); 2074 inner_classes->short_at_put(index++, inner_name_index); 2075 inner_classes->short_at_put(index++, inner_access_flags.as_short()); 2076 } 2077 2078 // 4347400: make sure there's no duplicate entry in the classes array 2079 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2080 for(int i = 0; i < inner_classes->length(); i += 4) { 2081 for(int j = i + 4; j < inner_classes->length(); j += 4) { 2082 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) || 2083 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) || 2084 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) || 2085 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)), 2086 "Duplicate entry in InnerClasses in class file %s", 2087 CHECK_0); 2088 } 2089 } 2090 } 2091 2092 // Update instanceKlass with inner class info. 2093 k->set_inner_classes(inner_classes()); 2094 return length; 2095 } 2096 2097 void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2098 k->set_is_synthetic(); 2099 } 2100 2101 void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2102 ClassFileStream* cfs = stream(); 2103 u2 signature_index = cfs->get_u2(CHECK); 2104 check_property( 2105 valid_cp_range(signature_index, cp->length()) && 2106 cp->tag_at(signature_index).is_utf8(), 2107 "Invalid constant pool index %u in Signature attribute in class file %s", 2108 signature_index, CHECK); 2109 k->set_generic_signature(cp->symbol_at(signature_index)); 2110 } 2111 2112 void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2113 ClassFileStream* cfs = stream(); 2114 // Set inner classes attribute to default sentinel 2115 k->set_inner_classes(Universe::the_empty_short_array()); 2116 cfs->guarantee_more(2, CHECK); // attributes_count 2117 u2 attributes_count = cfs->get_u2_fast(); 2118 bool parsed_sourcefile_attribute = false; 2119 bool parsed_innerclasses_attribute = false; 2120 bool parsed_enclosingmethod_attribute = false; 2121 u1* runtime_visible_annotations = NULL; 2122 int runtime_visible_annotations_length = 0; 2123 u1* runtime_invisible_annotations = NULL; 2124 int runtime_invisible_annotations_length = 0; 2125 // Iterate over attributes 2126 while (attributes_count--) { 2127 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2128 u2 attribute_name_index = cfs->get_u2_fast(); 2129 u4 attribute_length = cfs->get_u4_fast(); 2130 check_property( 2131 valid_cp_range(attribute_name_index, cp->length()) && 2132 cp->tag_at(attribute_name_index).is_utf8(), 2133 "Attribute name has bad constant pool index %u in class file %s", 2134 attribute_name_index, CHECK); 2135 symbolOop tag = cp->symbol_at(attribute_name_index); 2136 if (tag == vmSymbols::tag_source_file()) { 2137 // Check for SourceFile tag 2138 if (_need_verify) { 2139 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2140 } 2141 if (parsed_sourcefile_attribute) { 2142 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2143 } else { 2144 parsed_sourcefile_attribute = true; 2145 } 2146 parse_classfile_sourcefile_attribute(cp, k, CHECK); 2147 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2148 // Check for SourceDebugExtension tag 2149 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK); 2150 } else if (tag == vmSymbols::tag_inner_classes()) { 2151 // Check for InnerClasses tag 2152 if (parsed_innerclasses_attribute) { 2153 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2154 } else { 2155 parsed_innerclasses_attribute = true; 2156 } 2157 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK); 2158 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2159 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2160 "Wrong InnerClasses attribute length in class file %s", CHECK); 2161 } 2162 } else if (tag == vmSymbols::tag_synthetic()) { 2163 // Check for Synthetic tag 2164 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2165 if (attribute_length != 0) { 2166 classfile_parse_error( 2167 "Invalid Synthetic classfile attribute length %u in class file %s", 2168 attribute_length, CHECK); 2169 } 2170 parse_classfile_synthetic_attribute(cp, k, CHECK); 2171 } else if (tag == vmSymbols::tag_deprecated()) { 2172 // Check for Deprecatd tag - 4276120 2173 if (attribute_length != 0) { 2174 classfile_parse_error( 2175 "Invalid Deprecated classfile attribute length %u in class file %s", 2176 attribute_length, CHECK); 2177 } 2178 } else if (_major_version >= JAVA_1_5_VERSION) { 2179 if (tag == vmSymbols::tag_signature()) { 2180 if (attribute_length != 2) { 2181 classfile_parse_error( 2182 "Wrong Signature attribute length %u in class file %s", 2183 attribute_length, CHECK); 2184 } 2185 parse_classfile_signature_attribute(cp, k, CHECK); 2186 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2187 runtime_visible_annotations_length = attribute_length; 2188 runtime_visible_annotations = cfs->get_u1_buffer(); 2189 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2190 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2191 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2192 runtime_invisible_annotations_length = attribute_length; 2193 runtime_invisible_annotations = cfs->get_u1_buffer(); 2194 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2195 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2196 } else if (tag == vmSymbols::tag_enclosing_method()) { 2197 if (parsed_enclosingmethod_attribute) { 2198 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2199 } else { 2200 parsed_enclosingmethod_attribute = true; 2201 } 2202 cfs->guarantee_more(4, CHECK); // class_index, method_index 2203 u2 class_index = cfs->get_u2_fast(); 2204 u2 method_index = cfs->get_u2_fast(); 2205 if (class_index == 0) { 2206 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2207 } 2208 // Validate the constant pool indices and types 2209 if (!cp->is_within_bounds(class_index) || 2210 !is_klass_reference(cp, class_index)) { 2211 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2212 } 2213 if (method_index != 0 && 2214 (!cp->is_within_bounds(method_index) || 2215 !cp->tag_at(method_index).is_name_and_type())) { 2216 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2217 } 2218 k->set_enclosing_method_indices(class_index, method_index); 2219 } else { 2220 // Unknown attribute 2221 cfs->skip_u1(attribute_length, CHECK); 2222 } 2223 } else { 2224 // Unknown attribute 2225 cfs->skip_u1(attribute_length, CHECK); 2226 } 2227 } 2228 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations, 2229 runtime_visible_annotations_length, 2230 runtime_invisible_annotations, 2231 runtime_invisible_annotations_length, 2232 CHECK); 2233 k->set_class_annotations(annotations()); 2234 } 2235 2236 2237 typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 2238 int runtime_visible_annotations_length, 2239 u1* runtime_invisible_annotations, 2240 int runtime_invisible_annotations_length, TRAPS) { 2241 typeArrayHandle annotations; 2242 if (runtime_visible_annotations != NULL || 2243 runtime_invisible_annotations != NULL) { 2244 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length + 2245 runtime_invisible_annotations_length, CHECK_(annotations)); 2246 annotations = typeArrayHandle(THREAD, anno); 2247 if (runtime_visible_annotations != NULL) { 2248 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length); 2249 } 2250 if (runtime_invisible_annotations != NULL) { 2251 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length); 2252 } 2253 } 2254 return annotations; 2255 } 2256 2257 2258 static void initialize_static_field(fieldDescriptor* fd, TRAPS) { 2259 KlassHandle h_k (THREAD, fd->field_holder()); 2260 assert(h_k.not_null() && fd->is_static(), "just checking"); 2261 if (fd->has_initial_value()) { 2262 BasicType t = fd->field_type(); 2263 switch (t) { 2264 case T_BYTE: 2265 h_k()->byte_field_put(fd->offset(), fd->int_initial_value()); 2266 break; 2267 case T_BOOLEAN: 2268 h_k()->bool_field_put(fd->offset(), fd->int_initial_value()); 2269 break; 2270 case T_CHAR: 2271 h_k()->char_field_put(fd->offset(), fd->int_initial_value()); 2272 break; 2273 case T_SHORT: 2274 h_k()->short_field_put(fd->offset(), fd->int_initial_value()); 2275 break; 2276 case T_INT: 2277 h_k()->int_field_put(fd->offset(), fd->int_initial_value()); 2278 break; 2279 case T_FLOAT: 2280 h_k()->float_field_put(fd->offset(), fd->float_initial_value()); 2281 break; 2282 case T_DOUBLE: 2283 h_k()->double_field_put(fd->offset(), fd->double_initial_value()); 2284 break; 2285 case T_LONG: 2286 h_k()->long_field_put(fd->offset(), fd->long_initial_value()); 2287 break; 2288 case T_OBJECT: 2289 { 2290 #ifdef ASSERT 2291 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK); 2292 assert(fd->signature() == sym, "just checking"); 2293 #endif 2294 oop string = fd->string_initial_value(CHECK); 2295 h_k()->obj_field_put(fd->offset(), string); 2296 } 2297 break; 2298 default: 2299 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 2300 "Illegal ConstantValue attribute in class file"); 2301 } 2302 } 2303 } 2304 2305 2306 void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr, 2307 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) { 2308 // This code is for compatibility with earlier jdk's that do not 2309 // have the "discovered" field in java.lang.ref.Reference. For 1.5 2310 // the check for the "discovered" field should issue a warning if 2311 // the field is not found. For 1.6 this code should be issue a 2312 // fatal error if the "discovered" field is not found. 2313 // 2314 // Increment fac.nonstatic_oop_count so that the start of the 2315 // next type of non-static oops leaves room for the fake oop. 2316 // Do not increment next_nonstatic_oop_offset so that the 2317 // fake oop is place after the java.lang.ref.Reference oop 2318 // fields. 2319 // 2320 // Check the fields in java.lang.ref.Reference for the "discovered" 2321 // field. If it is not present, artifically create a field for it. 2322 // This allows this VM to run on early JDK where the field is not 2323 // present. 2324 2325 // 2326 // Increment fac.nonstatic_oop_count so that the start of the 2327 // next type of non-static oops leaves room for the fake oop. 2328 // Do not increment next_nonstatic_oop_offset so that the 2329 // fake oop is place after the java.lang.ref.Reference oop 2330 // fields. 2331 // 2332 // Check the fields in java.lang.ref.Reference for the "discovered" 2333 // field. If it is not present, artifically create a field for it. 2334 // This allows this VM to run on early JDK where the field is not 2335 // present. 2336 int reference_sig_index = 0; 2337 int reference_name_index = 0; 2338 int reference_index = 0; 2339 int extra = java_lang_ref_Reference::number_of_fake_oop_fields; 2340 const int n = (*fields_ptr)()->length(); 2341 for (int i = 0; i < n; i += instanceKlass::next_offset ) { 2342 int name_index = 2343 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset); 2344 int sig_index = 2345 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset); 2346 symbolOop f_name = cp->symbol_at(name_index); 2347 symbolOop f_sig = cp->symbol_at(sig_index); 2348 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) { 2349 // Save the index for reference signature for later use. 2350 // The fake discovered field does not entries in the 2351 // constant pool so the index for its signature cannot 2352 // be extracted from the constant pool. It will need 2353 // later, however. It's signature is vmSymbols::reference_signature() 2354 // so same an index for that signature. 2355 reference_sig_index = sig_index; 2356 reference_name_index = name_index; 2357 reference_index = i; 2358 } 2359 if (f_name == vmSymbols::reference_discovered_name() && 2360 f_sig == vmSymbols::reference_signature()) { 2361 // The values below are fake but will force extra 2362 // non-static oop fields and a corresponding non-static 2363 // oop map block to be allocated. 2364 extra = 0; 2365 break; 2366 } 2367 } 2368 if (extra != 0) { 2369 fac_ptr->nonstatic_oop_count += extra; 2370 // Add the additional entry to "fields" so that the klass 2371 // contains the "discoverd" field and the field will be initialized 2372 // in instances of the object. 2373 int fields_with_fix_length = (*fields_ptr)()->length() + 2374 instanceKlass::next_offset; 2375 typeArrayOop ff = oopFactory::new_permanent_shortArray( 2376 fields_with_fix_length, CHECK); 2377 typeArrayHandle fields_with_fix(THREAD, ff); 2378 2379 // Take everything from the original but the length. 2380 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) { 2381 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx)); 2382 } 2383 2384 // Add the fake field at the end. 2385 int i = (*fields_ptr)->length(); 2386 // There is no name index for the fake "discovered" field nor 2387 // signature but a signature is needed so that the field will 2388 // be properly initialized. Use one found for 2389 // one of the other reference fields. Be sure the index for the 2390 // name is 0. In fieldDescriptor::initialize() the index of the 2391 // name is checked. That check is by passed for the last nonstatic 2392 // oop field in a java.lang.ref.Reference which is assumed to be 2393 // this artificial "discovered" field. An assertion checks that 2394 // the name index is 0. 2395 assert(reference_index != 0, "Missing signature for reference"); 2396 2397 int j; 2398 for (j = 0; j < instanceKlass::next_offset; j++) { 2399 fields_with_fix->ushort_at_put(i + j, 2400 (*fields_ptr)->ushort_at(reference_index +j)); 2401 } 2402 // Clear the public access flag and set the private access flag. 2403 short flags; 2404 flags = 2405 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset); 2406 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set"); 2407 flags = flags & (~JVM_ACC_PUBLIC); 2408 flags = flags | JVM_ACC_PRIVATE; 2409 AccessFlags access_flags; 2410 access_flags.set_flags(flags); 2411 assert(!access_flags.is_public(), "Failed to clear public flag"); 2412 assert(access_flags.is_private(), "Failed to set private flag"); 2413 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset, 2414 flags); 2415 2416 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset) 2417 == reference_name_index, "The fake reference name is incorrect"); 2418 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset) 2419 == reference_sig_index, "The fake reference signature is incorrect"); 2420 // The type of the field is stored in the low_offset entry during 2421 // parsing. 2422 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) == 2423 NONSTATIC_OOP, "The fake reference type is incorrect"); 2424 2425 // "fields" is allocated in the permanent generation. Disgard 2426 // it and let it be collected. 2427 (*fields_ptr) = fields_with_fix; 2428 } 2429 return; 2430 } 2431 2432 2433 void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr, 2434 FieldAllocationCount *fac_ptr, TRAPS) { 2435 // Add fake fields for java.lang.Class instances 2436 // 2437 // This is not particularly nice. We should consider adding a 2438 // private transient object field at the Java level to 2439 // java.lang.Class. Alternatively we could add a subclass of 2440 // instanceKlass which provides an accessor and size computer for 2441 // this field, but that appears to be more code than this hack. 2442 // 2443 // NOTE that we wedge these in at the beginning rather than the 2444 // end of the object because the Class layout changed between JDK 2445 // 1.3 and JDK 1.4 with the new reflection implementation; some 2446 // nonstatic oop fields were added at the Java level. The offsets 2447 // of these fake fields can't change between these two JDK 2448 // versions because when the offsets are computed at bootstrap 2449 // time we don't know yet which version of the JDK we're running in. 2450 2451 // The values below are fake but will force two non-static oop fields and 2452 // a corresponding non-static oop map block to be allocated. 2453 const int extra = java_lang_Class::number_of_fake_oop_fields; 2454 fac_ptr->nonstatic_oop_count += extra; 2455 } 2456 2457 2458 void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) { 2459 // Cause the extra fake fields in java.lang.Class to show up before 2460 // the Java fields for layout compatibility between 1.3 and 1.4 2461 // Incrementing next_nonstatic_oop_offset here advances the 2462 // location where the real java fields are placed. 2463 const int extra = java_lang_Class::number_of_fake_oop_fields; 2464 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize); 2465 } 2466 2467 2468 // Force MethodHandle.vmentry to be an unmanaged pointer. 2469 // There is no way for a classfile to express this, so we must help it. 2470 void ClassFileParser::java_dyn_MethodHandle_fix_pre(constantPoolHandle cp, 2471 typeArrayHandle* fields_ptr, 2472 FieldAllocationCount *fac_ptr, 2473 TRAPS) { 2474 // Add fake fields for java.dyn.MethodHandle instances 2475 // 2476 // This is not particularly nice, but since there is no way to express 2477 // a native wordSize field in Java, we must do it at this level. 2478 2479 if (!EnableMethodHandles) return; 2480 2481 int word_sig_index = 0; 2482 const int cp_size = cp->length(); 2483 for (int index = 1; index < cp_size; index++) { 2484 if (cp->tag_at(index).is_utf8() && 2485 cp->symbol_at(index) == vmSymbols::machine_word_signature()) { 2486 word_sig_index = index; 2487 break; 2488 } 2489 } 2490 2491 if (word_sig_index == 0) 2492 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2493 "missing I or J signature (for vmentry) in java.dyn.MethodHandle"); 2494 2495 bool found_vmentry = false; 2496 2497 const int n = (*fields_ptr)()->length(); 2498 for (int i = 0; i < n; i += instanceKlass::next_offset) { 2499 int name_index = (*fields_ptr)->ushort_at(i + instanceKlass::name_index_offset); 2500 int sig_index = (*fields_ptr)->ushort_at(i + instanceKlass::signature_index_offset); 2501 int acc_flags = (*fields_ptr)->ushort_at(i + instanceKlass::access_flags_offset); 2502 symbolOop f_name = cp->symbol_at(name_index); 2503 symbolOop f_sig = cp->symbol_at(sig_index); 2504 if (f_sig == vmSymbols::byte_signature() && 2505 f_name == vmSymbols::vmentry_name() && 2506 (acc_flags & JVM_ACC_STATIC) == 0) { 2507 // Adjust the field type from byte to an unmanaged pointer. 2508 assert(fac_ptr->nonstatic_byte_count > 0, ""); 2509 fac_ptr->nonstatic_byte_count -= 1; 2510 (*fields_ptr)->ushort_at_put(i + instanceKlass::signature_index_offset, 2511 word_sig_index); 2512 fac_ptr->nonstatic_word_count += 1; 2513 2514 FieldAllocationType atype = (FieldAllocationType) (*fields_ptr)->ushort_at(i + instanceKlass::low_offset); 2515 assert(atype == NONSTATIC_BYTE, ""); 2516 FieldAllocationType new_atype = NONSTATIC_WORD; 2517 (*fields_ptr)->ushort_at_put(i + instanceKlass::low_offset, new_atype); 2518 2519 found_vmentry = true; 2520 break; 2521 } 2522 } 2523 2524 if (!found_vmentry) 2525 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), 2526 "missing vmentry byte field in java.dyn.MethodHandle"); 2527 2528 } 2529 2530 2531 instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name, 2532 Handle class_loader, 2533 Handle protection_domain, 2534 KlassHandle host_klass, 2535 GrowableArray<Handle>* cp_patches, 2536 symbolHandle& parsed_name, 2537 bool verify, 2538 TRAPS) { 2539 // So that JVMTI can cache class file in the state before retransformable agents 2540 // have modified it 2541 unsigned char *cached_class_file_bytes = NULL; 2542 jint cached_class_file_length; 2543 2544 ClassFileStream* cfs = stream(); 2545 // Timing 2546 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 2547 JavaThread* jt = (JavaThread*) THREAD; 2548 2549 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 2550 ClassLoader::perf_class_parse_selftime(), 2551 NULL, 2552 jt->get_thread_stat()->perf_recursion_counts_addr(), 2553 jt->get_thread_stat()->perf_timers_addr(), 2554 PerfClassTraceTime::PARSE_CLASS); 2555 2556 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false; 2557 2558 if (JvmtiExport::should_post_class_file_load_hook()) { 2559 unsigned char* ptr = cfs->buffer(); 2560 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 2561 2562 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain, 2563 &ptr, &end_ptr, 2564 &cached_class_file_bytes, 2565 &cached_class_file_length); 2566 2567 if (ptr != cfs->buffer()) { 2568 // JVMTI agent has modified class file data. 2569 // Set new class file stream using JVMTI agent modified 2570 // class file data. 2571 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 2572 set_stream(cfs); 2573 } 2574 } 2575 2576 _host_klass = host_klass; 2577 _cp_patches = cp_patches; 2578 2579 instanceKlassHandle nullHandle; 2580 2581 // Figure out whether we can skip format checking (matching classic VM behavior) 2582 _need_verify = Verifier::should_verify_for(class_loader(), verify); 2583 2584 // Set the verify flag in stream 2585 cfs->set_verify(_need_verify); 2586 2587 // Save the class file name for easier error message printing. 2588 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name(); 2589 2590 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 2591 // Magic value 2592 u4 magic = cfs->get_u4_fast(); 2593 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 2594 "Incompatible magic value %u in class file %s", 2595 magic, CHECK_(nullHandle)); 2596 2597 // Version numbers 2598 u2 minor_version = cfs->get_u2_fast(); 2599 u2 major_version = cfs->get_u2_fast(); 2600 2601 // Check version numbers - we check this even with verifier off 2602 if (!is_supported_version(major_version, minor_version)) { 2603 if (name.is_null()) { 2604 Exceptions::fthrow( 2605 THREAD_AND_LOCATION, 2606 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2607 "Unsupported major.minor version %u.%u", 2608 major_version, 2609 minor_version); 2610 } else { 2611 ResourceMark rm(THREAD); 2612 Exceptions::fthrow( 2613 THREAD_AND_LOCATION, 2614 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2615 "%s : Unsupported major.minor version %u.%u", 2616 name->as_C_string(), 2617 major_version, 2618 minor_version); 2619 } 2620 return nullHandle; 2621 } 2622 2623 _major_version = major_version; 2624 _minor_version = minor_version; 2625 2626 2627 // Check if verification needs to be relaxed for this class file 2628 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 2629 _relax_verify = Verifier::relax_verify_for(class_loader()); 2630 2631 // Constant pool 2632 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 2633 int cp_size = cp->length(); 2634 2635 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 2636 2637 // Access flags 2638 AccessFlags access_flags; 2639 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 2640 2641 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2642 // Set abstract bit for old class files for backward compatibility 2643 flags |= JVM_ACC_ABSTRACT; 2644 } 2645 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 2646 access_flags.set_flags(flags); 2647 2648 // This class and superclass 2649 instanceKlassHandle super_klass; 2650 u2 this_class_index = cfs->get_u2_fast(); 2651 check_property( 2652 valid_cp_range(this_class_index, cp_size) && 2653 cp->tag_at(this_class_index).is_unresolved_klass(), 2654 "Invalid this class index %u in constant pool in class file %s", 2655 this_class_index, CHECK_(nullHandle)); 2656 2657 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index)); 2658 assert(class_name.not_null(), "class_name can't be null"); 2659 2660 // It's important to set parsed_name *before* resolving the super class. 2661 // (it's used for cleanup by the caller if parsing fails) 2662 parsed_name = class_name; 2663 2664 // Update _class_name which could be null previously to be class_name 2665 _class_name = class_name; 2666 2667 // Don't need to check whether this class name is legal or not. 2668 // It has been checked when constant pool is parsed. 2669 // However, make sure it is not an array type. 2670 if (_need_verify) { 2671 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 2672 "Bad class name in class file %s", 2673 CHECK_(nullHandle)); 2674 } 2675 2676 klassOop preserve_this_klass; // for storing result across HandleMark 2677 2678 // release all handles when parsing is done 2679 { HandleMark hm(THREAD); 2680 2681 // Checks if name in class file matches requested name 2682 if (name.not_null() && class_name() != name()) { 2683 ResourceMark rm(THREAD); 2684 Exceptions::fthrow( 2685 THREAD_AND_LOCATION, 2686 vmSymbolHandles::java_lang_NoClassDefFoundError(), 2687 "%s (wrong name: %s)", 2688 name->as_C_string(), 2689 class_name->as_C_string() 2690 ); 2691 return nullHandle; 2692 } 2693 2694 if (TraceClassLoadingPreorder) { 2695 tty->print("[Loading %s", name()->as_klass_external_name()); 2696 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 2697 tty->print_cr("]"); 2698 } 2699 2700 u2 super_class_index = cfs->get_u2_fast(); 2701 if (super_class_index == 0) { 2702 check_property(class_name() == vmSymbols::java_lang_Object(), 2703 "Invalid superclass index %u in class file %s", 2704 super_class_index, 2705 CHECK_(nullHandle)); 2706 } else { 2707 check_property(valid_cp_range(super_class_index, cp_size) && 2708 is_klass_reference(cp, super_class_index), 2709 "Invalid superclass index %u in class file %s", 2710 super_class_index, 2711 CHECK_(nullHandle)); 2712 // The class name should be legal because it is checked when parsing constant pool. 2713 // However, make sure it is not an array type. 2714 bool is_array = false; 2715 if (cp->tag_at(super_class_index).is_klass()) { 2716 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index)); 2717 if (_need_verify) 2718 is_array = super_klass->oop_is_array(); 2719 } else if (_need_verify) { 2720 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 2721 } 2722 if (_need_verify) { 2723 guarantee_property(!is_array, 2724 "Bad superclass name in class file %s", CHECK_(nullHandle)); 2725 } 2726 } 2727 2728 // Interfaces 2729 u2 itfs_len = cfs->get_u2_fast(); 2730 objArrayHandle local_interfaces; 2731 if (itfs_len == 0) { 2732 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 2733 } else { 2734 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, _class_name, CHECK_(nullHandle)); 2735 } 2736 2737 // Fields (offsets are filled in later) 2738 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0}; 2739 objArrayHandle fields_annotations; 2740 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle)); 2741 // Methods 2742 bool has_final_method = false; 2743 AccessFlags promoted_flags; 2744 promoted_flags.set_flags(0); 2745 // These need to be oop pointers because they are allocated lazily 2746 // inside parse_methods inside a nested HandleMark 2747 objArrayOop methods_annotations_oop = NULL; 2748 objArrayOop methods_parameter_annotations_oop = NULL; 2749 objArrayOop methods_default_annotations_oop = NULL; 2750 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(), 2751 &promoted_flags, 2752 &has_final_method, 2753 &methods_annotations_oop, 2754 &methods_parameter_annotations_oop, 2755 &methods_default_annotations_oop, 2756 CHECK_(nullHandle)); 2757 2758 objArrayHandle methods_annotations(THREAD, methods_annotations_oop); 2759 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop); 2760 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop); 2761 2762 // We check super class after class file is parsed and format is checked 2763 if (super_class_index > 0 && super_klass.is_null()) { 2764 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index)); 2765 if (access_flags.is_interface()) { 2766 // Before attempting to resolve the superclass, check for class format 2767 // errors not checked yet. 2768 guarantee_property(sk() == vmSymbols::java_lang_Object(), 2769 "Interfaces must have java.lang.Object as superclass in class file %s", 2770 CHECK_(nullHandle)); 2771 } 2772 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 2773 sk, 2774 class_loader, 2775 protection_domain, 2776 true, 2777 CHECK_(nullHandle)); 2778 2779 KlassHandle kh (THREAD, k); 2780 super_klass = instanceKlassHandle(THREAD, kh()); 2781 if (LinkWellKnownClasses) // my super class is well known to me 2782 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve 2783 } 2784 if (super_klass.not_null()) { 2785 if (super_klass->is_interface()) { 2786 ResourceMark rm(THREAD); 2787 Exceptions::fthrow( 2788 THREAD_AND_LOCATION, 2789 vmSymbolHandles::java_lang_IncompatibleClassChangeError(), 2790 "class %s has interface %s as super class", 2791 class_name->as_klass_external_name(), 2792 super_klass->external_name() 2793 ); 2794 return nullHandle; 2795 } 2796 // Make sure super class is not final 2797 if (super_klass->is_final()) { 2798 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 2799 } 2800 } 2801 2802 // Compute the transitive list of all unique interfaces implemented by this class 2803 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 2804 2805 // sort methods 2806 typeArrayHandle method_ordering = sort_methods(methods, 2807 methods_annotations, 2808 methods_parameter_annotations, 2809 methods_default_annotations, 2810 CHECK_(nullHandle)); 2811 2812 // promote flags from parse_methods() to the klass' flags 2813 access_flags.add_promoted_flags(promoted_flags.as_int()); 2814 2815 // Size of Java vtable (in words) 2816 int vtable_size = 0; 2817 int itable_size = 0; 2818 int num_miranda_methods = 0; 2819 2820 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size, 2821 num_miranda_methods, 2822 super_klass(), 2823 methods(), 2824 access_flags, 2825 class_loader, 2826 class_name, 2827 local_interfaces(), 2828 CHECK_(nullHandle)); 2829 2830 // Size of Java itable (in words) 2831 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces); 2832 2833 // Field size and offset computation 2834 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); 2835 #ifndef PRODUCT 2836 int orig_nonstatic_field_size = 0; 2837 #endif 2838 int static_field_size = 0; 2839 int next_static_oop_offset; 2840 int next_static_double_offset; 2841 int next_static_word_offset; 2842 int next_static_short_offset; 2843 int next_static_byte_offset; 2844 int next_static_type_offset; 2845 int next_nonstatic_oop_offset; 2846 int next_nonstatic_double_offset; 2847 int next_nonstatic_word_offset; 2848 int next_nonstatic_short_offset; 2849 int next_nonstatic_byte_offset; 2850 int next_nonstatic_type_offset; 2851 int first_nonstatic_oop_offset; 2852 int first_nonstatic_field_offset; 2853 int next_nonstatic_field_offset; 2854 2855 // Calculate the starting byte offsets 2856 next_static_oop_offset = (instanceKlass::header_size() + 2857 align_object_offset(vtable_size) + 2858 align_object_offset(itable_size)) * wordSize; 2859 next_static_double_offset = next_static_oop_offset + 2860 (fac.static_oop_count * heapOopSize); 2861 if ( fac.static_double_count && 2862 (Universe::field_type_should_be_aligned(T_DOUBLE) || 2863 Universe::field_type_should_be_aligned(T_LONG)) ) { 2864 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 2865 } 2866 2867 next_static_word_offset = next_static_double_offset + 2868 (fac.static_double_count * BytesPerLong); 2869 next_static_short_offset = next_static_word_offset + 2870 (fac.static_word_count * BytesPerInt); 2871 next_static_byte_offset = next_static_short_offset + 2872 (fac.static_short_count * BytesPerShort); 2873 next_static_type_offset = align_size_up((next_static_byte_offset + 2874 fac.static_byte_count ), wordSize ); 2875 static_field_size = (next_static_type_offset - 2876 next_static_oop_offset) / wordSize; 2877 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() + 2878 nonstatic_field_size * heapOopSize; 2879 next_nonstatic_field_offset = first_nonstatic_field_offset; 2880 2881 // Add fake fields for java.lang.Class instances (also see below) 2882 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2883 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle)); 2884 } 2885 2886 // adjust the vmentry field declaration in java.dyn.MethodHandle 2887 if (EnableMethodHandles && class_name() == vmSymbols::sun_dyn_MethodHandleImpl() && class_loader.is_null()) { 2888 java_dyn_MethodHandle_fix_pre(cp, &fields, &fac, CHECK_(nullHandle)); 2889 } 2890 2891 // Add a fake "discovered" field if it is not present 2892 // for compatibility with earlier jdk's. 2893 if (class_name() == vmSymbols::java_lang_ref_Reference() 2894 && class_loader.is_null()) { 2895 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle)); 2896 } 2897 // end of "discovered" field compactibility fix 2898 2899 unsigned int nonstatic_double_count = fac.nonstatic_double_count; 2900 unsigned int nonstatic_word_count = fac.nonstatic_word_count; 2901 unsigned int nonstatic_short_count = fac.nonstatic_short_count; 2902 unsigned int nonstatic_byte_count = fac.nonstatic_byte_count; 2903 unsigned int nonstatic_oop_count = fac.nonstatic_oop_count; 2904 2905 bool super_has_nonstatic_fields = 2906 (super_klass() != NULL && super_klass->has_nonstatic_fields()); 2907 bool has_nonstatic_fields = super_has_nonstatic_fields || 2908 ((nonstatic_double_count + nonstatic_word_count + 2909 nonstatic_short_count + nonstatic_byte_count + 2910 nonstatic_oop_count) != 0); 2911 2912 2913 // Prepare list of oops for oop map generation. 2914 int* nonstatic_oop_offsets; 2915 unsigned int* nonstatic_oop_counts; 2916 unsigned int nonstatic_oop_map_count = 0; 2917 2918 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 2919 THREAD, int, nonstatic_oop_count + 1); 2920 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 2921 THREAD, unsigned int, nonstatic_oop_count + 1); 2922 2923 // Add fake fields for java.lang.Class instances (also see above). 2924 // FieldsAllocationStyle and CompactFields values will be reset to default. 2925 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2926 java_lang_Class_fix_post(&next_nonstatic_field_offset); 2927 nonstatic_oop_offsets[0] = first_nonstatic_field_offset; 2928 const uint fake_oop_count = (next_nonstatic_field_offset - 2929 first_nonstatic_field_offset) / heapOopSize; 2930 nonstatic_oop_counts[0] = fake_oop_count; 2931 nonstatic_oop_map_count = 1; 2932 nonstatic_oop_count -= fake_oop_count; 2933 first_nonstatic_oop_offset = first_nonstatic_field_offset; 2934 } else { 2935 first_nonstatic_oop_offset = 0; // will be set for first oop field 2936 } 2937 2938 #ifndef PRODUCT 2939 if( PrintCompactFieldsSavings ) { 2940 next_nonstatic_double_offset = next_nonstatic_field_offset + 2941 (nonstatic_oop_count * heapOopSize); 2942 if ( nonstatic_double_count > 0 ) { 2943 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong); 2944 } 2945 next_nonstatic_word_offset = next_nonstatic_double_offset + 2946 (nonstatic_double_count * BytesPerLong); 2947 next_nonstatic_short_offset = next_nonstatic_word_offset + 2948 (nonstatic_word_count * BytesPerInt); 2949 next_nonstatic_byte_offset = next_nonstatic_short_offset + 2950 (nonstatic_short_count * BytesPerShort); 2951 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset + 2952 nonstatic_byte_count ), heapOopSize ); 2953 orig_nonstatic_field_size = nonstatic_field_size + 2954 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize); 2955 } 2956 #endif 2957 bool compact_fields = CompactFields; 2958 int allocation_style = FieldsAllocationStyle; 2959 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range? 2960 assert(false, "0 <= FieldsAllocationStyle <= 1"); 2961 allocation_style = 1; // Optimistic 2962 } 2963 2964 // The next classes have predefined hard-coded fields offsets 2965 // (see in JavaClasses::compute_hard_coded_offsets()). 2966 // Use default fields allocation order for them. 2967 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 2968 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() || 2969 class_name() == vmSymbols::java_lang_Class() || 2970 class_name() == vmSymbols::java_lang_ClassLoader() || 2971 class_name() == vmSymbols::java_lang_ref_Reference() || 2972 class_name() == vmSymbols::java_lang_ref_SoftReference() || 2973 class_name() == vmSymbols::java_lang_StackTraceElement() || 2974 class_name() == vmSymbols::java_lang_String() || 2975 class_name() == vmSymbols::java_lang_Throwable() || 2976 class_name() == vmSymbols::java_lang_Boolean() || 2977 class_name() == vmSymbols::java_lang_Character() || 2978 class_name() == vmSymbols::java_lang_Float() || 2979 class_name() == vmSymbols::java_lang_Double() || 2980 class_name() == vmSymbols::java_lang_Byte() || 2981 class_name() == vmSymbols::java_lang_Short() || 2982 class_name() == vmSymbols::java_lang_Integer() || 2983 class_name() == vmSymbols::java_lang_Long())) { 2984 allocation_style = 0; // Allocate oops first 2985 compact_fields = false; // Don't compact fields 2986 } 2987 2988 if( allocation_style == 0 ) { 2989 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes 2990 next_nonstatic_oop_offset = next_nonstatic_field_offset; 2991 next_nonstatic_double_offset = next_nonstatic_oop_offset + 2992 (nonstatic_oop_count * heapOopSize); 2993 } else if( allocation_style == 1 ) { 2994 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops 2995 next_nonstatic_double_offset = next_nonstatic_field_offset; 2996 } else { 2997 ShouldNotReachHere(); 2998 } 2999 3000 int nonstatic_oop_space_count = 0; 3001 int nonstatic_word_space_count = 0; 3002 int nonstatic_short_space_count = 0; 3003 int nonstatic_byte_space_count = 0; 3004 int nonstatic_oop_space_offset; 3005 int nonstatic_word_space_offset; 3006 int nonstatic_short_space_offset; 3007 int nonstatic_byte_space_offset; 3008 3009 if( nonstatic_double_count > 0 ) { 3010 int offset = next_nonstatic_double_offset; 3011 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3012 if( compact_fields && offset != next_nonstatic_double_offset ) { 3013 // Allocate available fields into the gap before double field. 3014 int length = next_nonstatic_double_offset - offset; 3015 assert(length == BytesPerInt, ""); 3016 nonstatic_word_space_offset = offset; 3017 if( nonstatic_word_count > 0 ) { 3018 nonstatic_word_count -= 1; 3019 nonstatic_word_space_count = 1; // Only one will fit 3020 length -= BytesPerInt; 3021 offset += BytesPerInt; 3022 } 3023 nonstatic_short_space_offset = offset; 3024 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3025 nonstatic_short_count -= 1; 3026 nonstatic_short_space_count += 1; 3027 length -= BytesPerShort; 3028 offset += BytesPerShort; 3029 } 3030 nonstatic_byte_space_offset = offset; 3031 while( length > 0 && nonstatic_byte_count > 0 ) { 3032 nonstatic_byte_count -= 1; 3033 nonstatic_byte_space_count += 1; 3034 length -= 1; 3035 } 3036 // Allocate oop field in the gap if there are no other fields for that. 3037 nonstatic_oop_space_offset = offset; 3038 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3039 allocation_style != 0 ) { // when oop fields not first 3040 nonstatic_oop_count -= 1; 3041 nonstatic_oop_space_count = 1; // Only one will fit 3042 length -= heapOopSize; 3043 offset += heapOopSize; 3044 } 3045 } 3046 } 3047 3048 next_nonstatic_word_offset = next_nonstatic_double_offset + 3049 (nonstatic_double_count * BytesPerLong); 3050 next_nonstatic_short_offset = next_nonstatic_word_offset + 3051 (nonstatic_word_count * BytesPerInt); 3052 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3053 (nonstatic_short_count * BytesPerShort); 3054 3055 int notaligned_offset; 3056 if( allocation_style == 0 ) { 3057 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3058 } else { // allocation_style == 1 3059 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 3060 if( nonstatic_oop_count > 0 ) { 3061 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3062 } 3063 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3064 } 3065 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize ); 3066 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset 3067 - first_nonstatic_field_offset)/heapOopSize); 3068 3069 // Iterate over fields again and compute correct offsets. 3070 // The field allocation type was temporarily stored in the offset slot. 3071 // oop fields are located before non-oop fields (static and non-static). 3072 int len = fields->length(); 3073 for (int i = 0; i < len; i += instanceKlass::next_offset) { 3074 int real_offset; 3075 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i + instanceKlass::low_offset); 3076 switch (atype) { 3077 case STATIC_OOP: 3078 real_offset = next_static_oop_offset; 3079 next_static_oop_offset += heapOopSize; 3080 break; 3081 case STATIC_BYTE: 3082 real_offset = next_static_byte_offset; 3083 next_static_byte_offset += 1; 3084 break; 3085 case STATIC_SHORT: 3086 real_offset = next_static_short_offset; 3087 next_static_short_offset += BytesPerShort; 3088 break; 3089 case STATIC_WORD: 3090 real_offset = next_static_word_offset; 3091 next_static_word_offset += BytesPerInt; 3092 break; 3093 case STATIC_ALIGNED_DOUBLE: 3094 case STATIC_DOUBLE: 3095 real_offset = next_static_double_offset; 3096 next_static_double_offset += BytesPerLong; 3097 break; 3098 case NONSTATIC_OOP: 3099 if( nonstatic_oop_space_count > 0 ) { 3100 real_offset = nonstatic_oop_space_offset; 3101 nonstatic_oop_space_offset += heapOopSize; 3102 nonstatic_oop_space_count -= 1; 3103 } else { 3104 real_offset = next_nonstatic_oop_offset; 3105 next_nonstatic_oop_offset += heapOopSize; 3106 } 3107 // Update oop maps 3108 if( nonstatic_oop_map_count > 0 && 3109 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3110 real_offset - 3111 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3112 heapOopSize ) { 3113 // Extend current oop map 3114 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3115 } else { 3116 // Create new oop map 3117 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3118 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3119 nonstatic_oop_map_count += 1; 3120 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3121 first_nonstatic_oop_offset = real_offset; 3122 } 3123 } 3124 break; 3125 case NONSTATIC_BYTE: 3126 if( nonstatic_byte_space_count > 0 ) { 3127 real_offset = nonstatic_byte_space_offset; 3128 nonstatic_byte_space_offset += 1; 3129 nonstatic_byte_space_count -= 1; 3130 } else { 3131 real_offset = next_nonstatic_byte_offset; 3132 next_nonstatic_byte_offset += 1; 3133 } 3134 break; 3135 case NONSTATIC_SHORT: 3136 if( nonstatic_short_space_count > 0 ) { 3137 real_offset = nonstatic_short_space_offset; 3138 nonstatic_short_space_offset += BytesPerShort; 3139 nonstatic_short_space_count -= 1; 3140 } else { 3141 real_offset = next_nonstatic_short_offset; 3142 next_nonstatic_short_offset += BytesPerShort; 3143 } 3144 break; 3145 case NONSTATIC_WORD: 3146 if( nonstatic_word_space_count > 0 ) { 3147 real_offset = nonstatic_word_space_offset; 3148 nonstatic_word_space_offset += BytesPerInt; 3149 nonstatic_word_space_count -= 1; 3150 } else { 3151 real_offset = next_nonstatic_word_offset; 3152 next_nonstatic_word_offset += BytesPerInt; 3153 } 3154 break; 3155 case NONSTATIC_ALIGNED_DOUBLE: 3156 case NONSTATIC_DOUBLE: 3157 real_offset = next_nonstatic_double_offset; 3158 next_nonstatic_double_offset += BytesPerLong; 3159 break; 3160 default: 3161 ShouldNotReachHere(); 3162 } 3163 fields->short_at_put(i + instanceKlass::low_offset, extract_low_short_from_int(real_offset)); 3164 fields->short_at_put(i + instanceKlass::high_offset, extract_high_short_from_int(real_offset)); 3165 } 3166 3167 // Size of instances 3168 int instance_size; 3169 3170 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); 3171 instance_size = align_object_size(next_nonstatic_type_offset / wordSize); 3172 3173 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value"); 3174 3175 // Number of non-static oop map blocks allocated at end of klass. 3176 const unsigned int total_oop_map_count = 3177 compute_oop_map_count(super_klass, nonstatic_oop_map_count, 3178 first_nonstatic_oop_offset); 3179 3180 // Compute reference type 3181 ReferenceType rt; 3182 if (super_klass() == NULL) { 3183 rt = REF_NONE; 3184 } else { 3185 rt = super_klass->reference_type(); 3186 } 3187 3188 // We can now create the basic klassOop for this klass 3189 klassOop ik = oopFactory::new_instanceKlass(vtable_size, itable_size, 3190 static_field_size, 3191 total_oop_map_count, 3192 rt, CHECK_(nullHandle)); 3193 instanceKlassHandle this_klass (THREAD, ik); 3194 3195 assert(this_klass->static_field_size() == static_field_size, "sanity"); 3196 assert(this_klass->nonstatic_oop_map_count() == total_oop_map_count, 3197 "sanity"); 3198 3199 // Fill in information already parsed 3200 this_klass->set_access_flags(access_flags); 3201 this_klass->set_should_verify_class(verify); 3202 jint lh = Klass::instance_layout_helper(instance_size, false); 3203 this_klass->set_layout_helper(lh); 3204 assert(this_klass->oop_is_instance(), "layout is correct"); 3205 assert(this_klass->size_helper() == instance_size, "correct size_helper"); 3206 // Not yet: supers are done below to support the new subtype-checking fields 3207 //this_klass->set_super(super_klass()); 3208 this_klass->set_class_loader(class_loader()); 3209 this_klass->set_nonstatic_field_size(nonstatic_field_size); 3210 this_klass->set_has_nonstatic_fields(has_nonstatic_fields); 3211 this_klass->set_static_oop_field_size(fac.static_oop_count); 3212 cp->set_pool_holder(this_klass()); 3213 this_klass->set_constants(cp()); 3214 this_klass->set_local_interfaces(local_interfaces()); 3215 this_klass->set_fields(fields()); 3216 this_klass->set_methods(methods()); 3217 if (has_final_method) { 3218 this_klass->set_has_final_method(); 3219 } 3220 this_klass->set_method_ordering(method_ordering()); 3221 // The instanceKlass::_methods_jmethod_ids cache and the 3222 // instanceKlass::_methods_cached_itable_indices cache are 3223 // both managed on the assumption that the initial cache 3224 // size is equal to the number of methods in the class. If 3225 // that changes, then instanceKlass::idnum_can_increment() 3226 // has to be changed accordingly. 3227 this_klass->set_initial_method_idnum(methods->length()); 3228 this_klass->set_name(cp->klass_name_at(this_class_index)); 3229 if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself 3230 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 3231 this_klass->set_protection_domain(protection_domain()); 3232 this_klass->set_fields_annotations(fields_annotations()); 3233 this_klass->set_methods_annotations(methods_annotations()); 3234 this_klass->set_methods_parameter_annotations(methods_parameter_annotations()); 3235 this_klass->set_methods_default_annotations(methods_default_annotations()); 3236 3237 this_klass->set_minor_version(minor_version); 3238 this_klass->set_major_version(major_version); 3239 3240 // Set up methodOop::intrinsic_id as soon as we know the names of methods. 3241 // (We used to do this lazily, but now we query it in Rewriter, 3242 // which is eagerly done for every method, so we might as well do it now, 3243 // when everything is fresh in memory.) 3244 if (methodOopDesc::klass_id_for_intrinsics(this_klass->as_klassOop()) != vmSymbols::NO_SID) { 3245 for (int j = 0; j < methods->length(); j++) { 3246 ((methodOop)methods->obj_at(j))->init_intrinsic_id(); 3247 } 3248 } 3249 3250 if (cached_class_file_bytes != NULL) { 3251 // JVMTI: we have an instanceKlass now, tell it about the cached bytes 3252 this_klass->set_cached_class_file(cached_class_file_bytes, 3253 cached_class_file_length); 3254 } 3255 3256 // Miranda methods 3257 if ((num_miranda_methods > 0) || 3258 // if this class introduced new miranda methods or 3259 (super_klass.not_null() && (super_klass->has_miranda_methods())) 3260 // super class exists and this class inherited miranda methods 3261 ) { 3262 this_klass->set_has_miranda_methods(); // then set a flag 3263 } 3264 3265 // Additional attributes 3266 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle)); 3267 3268 // Make sure this is the end of class file stream 3269 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3270 3271 // Initialize static fields 3272 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle)); 3273 3274 // VerifyOops believes that once this has been set, the object is completely loaded. 3275 // Compute transitive closure of interfaces this class implements 3276 this_klass->set_transitive_interfaces(transitive_interfaces()); 3277 3278 // Fill in information needed to compute superclasses. 3279 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 3280 3281 // Initialize itable offset tables 3282 klassItable::setup_itable_offset_table(this_klass); 3283 3284 // Do final class setup 3285 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_counts); 3286 3287 set_precomputed_flags(this_klass); 3288 3289 // reinitialize modifiers, using the InnerClasses attribute 3290 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 3291 this_klass->set_modifier_flags(computed_modifiers); 3292 3293 // check if this class can access its super class 3294 check_super_class_access(this_klass, CHECK_(nullHandle)); 3295 3296 // check if this class can access its superinterfaces 3297 check_super_interface_access(this_klass, CHECK_(nullHandle)); 3298 3299 // check if this class overrides any final method 3300 check_final_method_override(this_klass, CHECK_(nullHandle)); 3301 3302 // check that if this class is an interface then it doesn't have static methods 3303 if (this_klass->is_interface()) { 3304 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 3305 } 3306 3307 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()), 3308 false /* not shared class */); 3309 3310 if (TraceClassLoading) { 3311 // print in a single call to reduce interleaving of output 3312 if (cfs->source() != NULL) { 3313 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3314 cfs->source()); 3315 } else if (class_loader.is_null()) { 3316 if (THREAD->is_Java_thread()) { 3317 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 3318 tty->print("[Loaded %s by instance of %s]\n", 3319 this_klass->external_name(), 3320 instanceKlass::cast(caller)->external_name()); 3321 } else { 3322 tty->print("[Loaded %s]\n", this_klass->external_name()); 3323 } 3324 } else { 3325 ResourceMark rm; 3326 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3327 instanceKlass::cast(class_loader->klass())->external_name()); 3328 } 3329 } 3330 3331 if (TraceClassResolution) { 3332 // print out the superclass. 3333 const char * from = Klass::cast(this_klass())->external_name(); 3334 if (this_klass->java_super() != NULL) { 3335 tty->print("RESOLVE %s %s (super)\n", from, instanceKlass::cast(this_klass->java_super())->external_name()); 3336 } 3337 // print out each of the interface classes referred to by this class. 3338 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces()); 3339 if (!local_interfaces.is_null()) { 3340 int length = local_interfaces->length(); 3341 for (int i = 0; i < length; i++) { 3342 klassOop k = klassOop(local_interfaces->obj_at(i)); 3343 instanceKlass* to_class = instanceKlass::cast(k); 3344 const char * to = to_class->external_name(); 3345 tty->print("RESOLVE %s %s (interface)\n", from, to); 3346 } 3347 } 3348 } 3349 3350 #ifndef PRODUCT 3351 if( PrintCompactFieldsSavings ) { 3352 if( nonstatic_field_size < orig_nonstatic_field_size ) { 3353 tty->print("[Saved %d of %d bytes in %s]\n", 3354 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize, 3355 orig_nonstatic_field_size*heapOopSize, 3356 this_klass->external_name()); 3357 } else if( nonstatic_field_size > orig_nonstatic_field_size ) { 3358 tty->print("[Wasted %d over %d bytes in %s]\n", 3359 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize, 3360 orig_nonstatic_field_size*heapOopSize, 3361 this_klass->external_name()); 3362 } 3363 } 3364 #endif 3365 3366 // preserve result across HandleMark 3367 preserve_this_klass = this_klass(); 3368 } 3369 3370 // Create new handle outside HandleMark 3371 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 3372 debug_only(this_klass->as_klassOop()->verify();) 3373 3374 return this_klass; 3375 } 3376 3377 3378 unsigned int 3379 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 3380 unsigned int nonstatic_oop_map_count, 3381 int first_nonstatic_oop_offset) { 3382 unsigned int map_count = 3383 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 3384 if (nonstatic_oop_map_count > 0) { 3385 // We have oops to add to map 3386 if (map_count == 0) { 3387 map_count = nonstatic_oop_map_count; 3388 } else { 3389 // Check whether we should add a new map block or whether the last one can 3390 // be extended 3391 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3392 OopMapBlock* const last_map = first_map + map_count - 1; 3393 3394 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3395 if (next_offset == first_nonstatic_oop_offset) { 3396 // There is no gap bettwen superklass's last oop field and first 3397 // local oop field, merge maps. 3398 nonstatic_oop_map_count -= 1; 3399 } else { 3400 // Superklass didn't end with a oop field, add extra maps 3401 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3402 } 3403 map_count += nonstatic_oop_map_count; 3404 } 3405 } 3406 return map_count; 3407 } 3408 3409 3410 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 3411 unsigned int nonstatic_oop_map_count, 3412 int* nonstatic_oop_offsets, 3413 unsigned int* nonstatic_oop_counts) { 3414 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 3415 const instanceKlass* const super = k->superklass(); 3416 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 3417 if (super_count > 0) { 3418 // Copy maps from superklass 3419 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 3420 for (unsigned int i = 0; i < super_count; ++i) { 3421 *this_oop_map++ = *super_oop_map++; 3422 } 3423 } 3424 3425 if (nonstatic_oop_map_count > 0) { 3426 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 3427 // The counts differ because there is no gap between superklass's last oop 3428 // field and the first local oop field. Extend the last oop map copied 3429 // from the superklass instead of creating new one. 3430 nonstatic_oop_map_count--; 3431 nonstatic_oop_offsets++; 3432 this_oop_map--; 3433 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 3434 this_oop_map++; 3435 } 3436 3437 // Add new map blocks, fill them 3438 while (nonstatic_oop_map_count-- > 0) { 3439 this_oop_map->set_offset(*nonstatic_oop_offsets++); 3440 this_oop_map->set_count(*nonstatic_oop_counts++); 3441 this_oop_map++; 3442 } 3443 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 3444 this_oop_map, "sanity"); 3445 } 3446 } 3447 3448 3449 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 3450 klassOop super = k->super(); 3451 3452 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 3453 // in which case we don't have to register objects as finalizable 3454 if (!_has_empty_finalizer) { 3455 if (_has_finalizer || 3456 (super != NULL && super->klass_part()->has_finalizer())) { 3457 k->set_has_finalizer(); 3458 } 3459 } 3460 3461 #ifdef ASSERT 3462 bool f = false; 3463 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(), 3464 vmSymbols::void_method_signature()); 3465 if (m != NULL && !m->is_empty_method()) { 3466 f = true; 3467 } 3468 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 3469 #endif 3470 3471 // Check if this klass supports the java.lang.Cloneable interface 3472 if (SystemDictionary::cloneable_klass_loaded()) { 3473 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) { 3474 k->set_is_cloneable(); 3475 } 3476 } 3477 3478 // Check if this klass has a vanilla default constructor 3479 if (super == NULL) { 3480 // java.lang.Object has empty default constructor 3481 k->set_has_vanilla_constructor(); 3482 } else { 3483 if (Klass::cast(super)->has_vanilla_constructor() && 3484 _has_vanilla_constructor) { 3485 k->set_has_vanilla_constructor(); 3486 } 3487 #ifdef ASSERT 3488 bool v = false; 3489 if (Klass::cast(super)->has_vanilla_constructor()) { 3490 methodOop constructor = k->find_method(vmSymbols::object_initializer_name( 3491 ), vmSymbols::void_method_signature()); 3492 if (constructor != NULL && constructor->is_vanilla_constructor()) { 3493 v = true; 3494 } 3495 } 3496 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 3497 #endif 3498 } 3499 3500 // If it cannot be fast-path allocated, set a bit in the layout helper. 3501 // See documentation of instanceKlass::can_be_fastpath_allocated(). 3502 assert(k->size_helper() > 0, "layout_helper is initialized"); 3503 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 3504 || k->is_abstract() || k->is_interface() 3505 || (k->name() == vmSymbols::java_lang_Class() 3506 && k->class_loader() == NULL) 3507 || k->size_helper() >= FastAllocateSizeLimit) { 3508 // Forbid fast-path allocation. 3509 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 3510 k->set_layout_helper(lh); 3511 } 3512 } 3513 3514 3515 // utility method for appending and array with check for duplicates 3516 3517 void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) { 3518 // iterate over new interfaces 3519 for (int i = 0; i < ifs->length(); i++) { 3520 oop e = ifs->obj_at(i); 3521 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking"); 3522 // check for duplicates 3523 bool duplicate = false; 3524 for (int j = 0; j < index; j++) { 3525 if (result->obj_at(j) == e) { 3526 duplicate = true; 3527 break; 3528 } 3529 } 3530 // add new interface 3531 if (!duplicate) { 3532 result->obj_at_put(index++, e); 3533 } 3534 } 3535 } 3536 3537 objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) { 3538 // Compute maximum size for transitive interfaces 3539 int max_transitive_size = 0; 3540 int super_size = 0; 3541 // Add superclass transitive interfaces size 3542 if (super.not_null()) { 3543 super_size = super->transitive_interfaces()->length(); 3544 max_transitive_size += super_size; 3545 } 3546 // Add local interfaces' super interfaces 3547 int local_size = local_ifs->length(); 3548 for (int i = 0; i < local_size; i++) { 3549 klassOop l = klassOop(local_ifs->obj_at(i)); 3550 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length(); 3551 } 3552 // Finally add local interfaces 3553 max_transitive_size += local_size; 3554 // Construct array 3555 objArrayHandle result; 3556 if (max_transitive_size == 0) { 3557 // no interfaces, use canonicalized array 3558 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 3559 } else if (max_transitive_size == super_size) { 3560 // no new local interfaces added, share superklass' transitive interface array 3561 result = objArrayHandle(THREAD, super->transitive_interfaces()); 3562 } else if (max_transitive_size == local_size) { 3563 // only local interfaces added, share local interface array 3564 result = local_ifs; 3565 } else { 3566 objArrayHandle nullHandle; 3567 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle)); 3568 result = objArrayHandle(THREAD, new_objarray); 3569 int index = 0; 3570 // Copy down from superclass 3571 if (super.not_null()) { 3572 append_interfaces(result, index, super->transitive_interfaces()); 3573 } 3574 // Copy down from local interfaces' superinterfaces 3575 for (int i = 0; i < local_ifs->length(); i++) { 3576 klassOop l = klassOop(local_ifs->obj_at(i)); 3577 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces()); 3578 } 3579 // Finally add local interfaces 3580 append_interfaces(result, index, local_ifs()); 3581 3582 // Check if duplicates were removed 3583 if (index != max_transitive_size) { 3584 assert(index < max_transitive_size, "just checking"); 3585 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle)); 3586 for (int i = 0; i < index; i++) { 3587 oop e = result->obj_at(i); 3588 assert(e != NULL, "just checking"); 3589 new_result->obj_at_put(i, e); 3590 } 3591 result = objArrayHandle(THREAD, new_result); 3592 } 3593 } 3594 return result; 3595 } 3596 3597 3598 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 3599 klassOop super = this_klass->super(); 3600 if ((super != NULL) && 3601 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) { 3602 ResourceMark rm(THREAD); 3603 Exceptions::fthrow( 3604 THREAD_AND_LOCATION, 3605 vmSymbolHandles::java_lang_IllegalAccessError(), 3606 "class %s cannot access its superclass %s", 3607 this_klass->external_name(), 3608 instanceKlass::cast(super)->external_name() 3609 ); 3610 return; 3611 } 3612 } 3613 3614 3615 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 3616 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces()); 3617 int lng = local_interfaces->length(); 3618 for (int i = lng - 1; i >= 0; i--) { 3619 klassOop k = klassOop(local_interfaces->obj_at(i)); 3620 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface"); 3621 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) { 3622 ResourceMark rm(THREAD); 3623 Exceptions::fthrow( 3624 THREAD_AND_LOCATION, 3625 vmSymbolHandles::java_lang_IllegalAccessError(), 3626 "class %s cannot access its superinterface %s", 3627 this_klass->external_name(), 3628 instanceKlass::cast(k)->external_name() 3629 ); 3630 return; 3631 } 3632 } 3633 } 3634 3635 3636 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 3637 objArrayHandle methods (THREAD, this_klass->methods()); 3638 int num_methods = methods->length(); 3639 3640 // go thru each method and check if it overrides a final method 3641 for (int index = 0; index < num_methods; index++) { 3642 methodOop m = (methodOop)methods->obj_at(index); 3643 3644 // skip private, static and <init> methods 3645 if ((!m->is_private()) && 3646 (!m->is_static()) && 3647 (m->name() != vmSymbols::object_initializer_name())) { 3648 3649 symbolOop name = m->name(); 3650 symbolOop signature = m->signature(); 3651 klassOop k = this_klass->super(); 3652 methodOop super_m = NULL; 3653 while (k != NULL) { 3654 // skip supers that don't have final methods. 3655 if (k->klass_part()->has_final_method()) { 3656 // lookup a matching method in the super class hierarchy 3657 super_m = instanceKlass::cast(k)->lookup_method(name, signature); 3658 if (super_m == NULL) { 3659 break; // didn't find any match; get out 3660 } 3661 3662 if (super_m->is_final() && 3663 // matching method in super is final 3664 (Reflection::verify_field_access(this_klass->as_klassOop(), 3665 super_m->method_holder(), 3666 super_m->method_holder(), 3667 super_m->access_flags(), false)) 3668 // this class can access super final method and therefore override 3669 ) { 3670 ResourceMark rm(THREAD); 3671 Exceptions::fthrow( 3672 THREAD_AND_LOCATION, 3673 vmSymbolHandles::java_lang_VerifyError(), 3674 "class %s overrides final method %s.%s", 3675 this_klass->external_name(), 3676 name->as_C_string(), 3677 signature->as_C_string() 3678 ); 3679 return; 3680 } 3681 3682 // continue to look from super_m's holder's super. 3683 k = instanceKlass::cast(super_m->method_holder())->super(); 3684 continue; 3685 } 3686 3687 k = k->klass_part()->super(); 3688 } 3689 } 3690 } 3691 } 3692 3693 3694 // assumes that this_klass is an interface 3695 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 3696 assert(this_klass->is_interface(), "not an interface"); 3697 objArrayHandle methods (THREAD, this_klass->methods()); 3698 int num_methods = methods->length(); 3699 3700 for (int index = 0; index < num_methods; index++) { 3701 methodOop m = (methodOop)methods->obj_at(index); 3702 // if m is static and not the init method, throw a verify error 3703 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 3704 ResourceMark rm(THREAD); 3705 Exceptions::fthrow( 3706 THREAD_AND_LOCATION, 3707 vmSymbolHandles::java_lang_VerifyError(), 3708 "Illegal static method %s in interface %s", 3709 m->name()->as_C_string(), 3710 this_klass->external_name() 3711 ); 3712 return; 3713 } 3714 } 3715 } 3716 3717 // utility methods for format checking 3718 3719 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 3720 if (!_need_verify) { return; } 3721 3722 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3723 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3724 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3725 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 3726 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3727 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 3728 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3729 3730 if ((is_abstract && is_final) || 3731 (is_interface && !is_abstract) || 3732 (is_interface && major_gte_15 && (is_super || is_enum)) || 3733 (!is_interface && major_gte_15 && is_annotation)) { 3734 ResourceMark rm(THREAD); 3735 Exceptions::fthrow( 3736 THREAD_AND_LOCATION, 3737 vmSymbolHandles::java_lang_ClassFormatError(), 3738 "Illegal class modifiers in class %s: 0x%X", 3739 _class_name->as_C_string(), flags 3740 ); 3741 return; 3742 } 3743 } 3744 3745 bool ClassFileParser::has_illegal_visibility(jint flags) { 3746 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3747 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3748 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3749 3750 return ((is_public && is_protected) || 3751 (is_public && is_private) || 3752 (is_protected && is_private)); 3753 } 3754 3755 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 3756 u2 max_version = JDK_Version::is_gte_jdk17x_version() ? 3757 JAVA_MAX_SUPPORTED_VERSION : JAVA_6_VERSION; 3758 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 3759 (major <= max_version) && 3760 ((major != max_version) || 3761 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 3762 } 3763 3764 void ClassFileParser::verify_legal_field_modifiers( 3765 jint flags, bool is_interface, TRAPS) { 3766 if (!_need_verify) { return; } 3767 3768 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3769 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3770 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3771 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3772 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3773 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 3774 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 3775 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3776 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3777 3778 bool is_illegal = false; 3779 3780 if (is_interface) { 3781 if (!is_public || !is_static || !is_final || is_private || 3782 is_protected || is_volatile || is_transient || 3783 (major_gte_15 && is_enum)) { 3784 is_illegal = true; 3785 } 3786 } else { // not interface 3787 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 3788 is_illegal = true; 3789 } 3790 } 3791 3792 if (is_illegal) { 3793 ResourceMark rm(THREAD); 3794 Exceptions::fthrow( 3795 THREAD_AND_LOCATION, 3796 vmSymbolHandles::java_lang_ClassFormatError(), 3797 "Illegal field modifiers in class %s: 0x%X", 3798 _class_name->as_C_string(), flags); 3799 return; 3800 } 3801 } 3802 3803 void ClassFileParser::verify_legal_method_modifiers( 3804 jint flags, bool is_interface, symbolHandle name, TRAPS) { 3805 if (!_need_verify) { return; } 3806 3807 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3808 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3809 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3810 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3811 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 3812 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3813 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 3814 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 3815 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 3816 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3817 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 3818 3819 bool is_illegal = false; 3820 3821 if (is_interface) { 3822 if (!is_abstract || !is_public || is_static || is_final || 3823 is_native || (major_gte_15 && (is_synchronized || is_strict))) { 3824 is_illegal = true; 3825 } 3826 } else { // not interface 3827 if (is_initializer) { 3828 if (is_static || is_final || is_synchronized || is_native || 3829 is_abstract || (major_gte_15 && is_bridge)) { 3830 is_illegal = true; 3831 } 3832 } else { // not initializer 3833 if (is_abstract) { 3834 if ((is_final || is_native || is_private || is_static || 3835 (major_gte_15 && (is_synchronized || is_strict)))) { 3836 is_illegal = true; 3837 } 3838 } 3839 if (has_illegal_visibility(flags)) { 3840 is_illegal = true; 3841 } 3842 } 3843 } 3844 3845 if (is_illegal) { 3846 ResourceMark rm(THREAD); 3847 Exceptions::fthrow( 3848 THREAD_AND_LOCATION, 3849 vmSymbolHandles::java_lang_ClassFormatError(), 3850 "Method %s in class %s has illegal modifiers: 0x%X", 3851 name->as_C_string(), _class_name->as_C_string(), flags); 3852 return; 3853 } 3854 } 3855 3856 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 3857 assert(_need_verify, "only called when _need_verify is true"); 3858 int i = 0; 3859 int count = length >> 2; 3860 for (int k=0; k<count; k++) { 3861 unsigned char b0 = buffer[i]; 3862 unsigned char b1 = buffer[i+1]; 3863 unsigned char b2 = buffer[i+2]; 3864 unsigned char b3 = buffer[i+3]; 3865 // For an unsigned char v, 3866 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 3867 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 3868 unsigned char res = b0 | b0 - 1 | 3869 b1 | b1 - 1 | 3870 b2 | b2 - 1 | 3871 b3 | b3 - 1; 3872 if (res >= 128) break; 3873 i += 4; 3874 } 3875 for(; i < length; i++) { 3876 unsigned short c; 3877 // no embedded zeros 3878 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 3879 if(buffer[i] < 128) { 3880 continue; 3881 } 3882 if ((i + 5) < length) { // see if it's legal supplementary character 3883 if (UTF8::is_supplementary_character(&buffer[i])) { 3884 c = UTF8::get_supplementary_character(&buffer[i]); 3885 i += 5; 3886 continue; 3887 } 3888 } 3889 switch (buffer[i] >> 4) { 3890 default: break; 3891 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 3892 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3893 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 3894 c = (buffer[i] & 0x1F) << 6; 3895 i++; 3896 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 3897 c += buffer[i] & 0x3F; 3898 if (_major_version <= 47 || c == 0 || c >= 0x80) { 3899 // for classes with major > 47, c must a null or a character in its shortest form 3900 break; 3901 } 3902 } 3903 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3904 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 3905 c = (buffer[i] & 0xF) << 12; 3906 i += 2; 3907 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 3908 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 3909 if (_major_version <= 47 || c >= 0x800) { 3910 // for classes with major > 47, c must be in its shortest form 3911 break; 3912 } 3913 } 3914 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3915 } // end of switch 3916 } // end of for 3917 } 3918 3919 // Checks if name is a legal class name. 3920 void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) { 3921 if (!_need_verify || _relax_verify) { return; } 3922 3923 char buf[fixed_buffer_size]; 3924 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3925 unsigned int length = name->utf8_length(); 3926 bool legal = false; 3927 3928 if (length > 0) { 3929 char* p; 3930 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 3931 p = skip_over_field_signature(bytes, false, length, CHECK); 3932 legal = (p != NULL) && ((p - bytes) == (int)length); 3933 } else if (_major_version < JAVA_1_5_VERSION) { 3934 if (bytes[0] != '<') { 3935 p = skip_over_field_name(bytes, true, length); 3936 legal = (p != NULL) && ((p - bytes) == (int)length); 3937 } 3938 } else { 3939 // 4900761: relax the constraints based on JSR202 spec 3940 // Class names may be drawn from the entire Unicode character set. 3941 // Identifiers between '/' must be unqualified names. 3942 // The utf8 string has been verified when parsing cpool entries. 3943 legal = verify_unqualified_name(bytes, length, LegalClass); 3944 } 3945 } 3946 if (!legal) { 3947 ResourceMark rm(THREAD); 3948 Exceptions::fthrow( 3949 THREAD_AND_LOCATION, 3950 vmSymbolHandles::java_lang_ClassFormatError(), 3951 "Illegal class name \"%s\" in class file %s", bytes, 3952 _class_name->as_C_string() 3953 ); 3954 return; 3955 } 3956 } 3957 3958 // Checks if name is a legal field name. 3959 void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) { 3960 if (!_need_verify || _relax_verify) { return; } 3961 3962 char buf[fixed_buffer_size]; 3963 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3964 unsigned int length = name->utf8_length(); 3965 bool legal = false; 3966 3967 if (length > 0) { 3968 if (_major_version < JAVA_1_5_VERSION) { 3969 if (bytes[0] != '<') { 3970 char* p = skip_over_field_name(bytes, false, length); 3971 legal = (p != NULL) && ((p - bytes) == (int)length); 3972 } 3973 } else { 3974 // 4881221: relax the constraints based on JSR202 spec 3975 legal = verify_unqualified_name(bytes, length, LegalField); 3976 } 3977 } 3978 3979 if (!legal) { 3980 ResourceMark rm(THREAD); 3981 Exceptions::fthrow( 3982 THREAD_AND_LOCATION, 3983 vmSymbolHandles::java_lang_ClassFormatError(), 3984 "Illegal field name \"%s\" in class %s", bytes, 3985 _class_name->as_C_string() 3986 ); 3987 return; 3988 } 3989 } 3990 3991 // Checks if name is a legal method name. 3992 void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) { 3993 if (!_need_verify || _relax_verify) { return; } 3994 3995 assert(!name.is_null(), "method name is null"); 3996 char buf[fixed_buffer_size]; 3997 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3998 unsigned int length = name->utf8_length(); 3999 bool legal = false; 4000 4001 if (length > 0) { 4002 if (bytes[0] == '<') { 4003 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 4004 legal = true; 4005 } 4006 } else if (_major_version < JAVA_1_5_VERSION) { 4007 char* p; 4008 p = skip_over_field_name(bytes, false, length); 4009 legal = (p != NULL) && ((p - bytes) == (int)length); 4010 } else { 4011 // 4881221: relax the constraints based on JSR202 spec 4012 legal = verify_unqualified_name(bytes, length, LegalMethod); 4013 } 4014 } 4015 4016 if (!legal) { 4017 ResourceMark rm(THREAD); 4018 Exceptions::fthrow( 4019 THREAD_AND_LOCATION, 4020 vmSymbolHandles::java_lang_ClassFormatError(), 4021 "Illegal method name \"%s\" in class %s", bytes, 4022 _class_name->as_C_string() 4023 ); 4024 return; 4025 } 4026 } 4027 4028 4029 // Checks if signature is a legal field signature. 4030 void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) { 4031 if (!_need_verify) { return; } 4032 4033 char buf[fixed_buffer_size]; 4034 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4035 unsigned int length = signature->utf8_length(); 4036 char* p = skip_over_field_signature(bytes, false, length, CHECK); 4037 4038 if (p == NULL || (p - bytes) != (int)length) { 4039 ResourceMark rm(THREAD); 4040 Exceptions::fthrow( 4041 THREAD_AND_LOCATION, 4042 vmSymbolHandles::java_lang_ClassFormatError(), 4043 "Field \"%s\" in class %s has illegal signature \"%s\"", 4044 name->as_C_string(), _class_name->as_C_string(), bytes 4045 ); 4046 return; 4047 } 4048 } 4049 4050 // Checks if signature is a legal method signature. 4051 // Returns number of parameters 4052 int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) { 4053 if (!_need_verify) { 4054 // make sure caller's args_size will be less than 0 even for non-static 4055 // method so it will be recomputed in compute_size_of_parameters(). 4056 return -2; 4057 } 4058 4059 unsigned int args_size = 0; 4060 char buf[fixed_buffer_size]; 4061 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4062 unsigned int length = signature->utf8_length(); 4063 char* nextp; 4064 4065 // The first character must be a '(' 4066 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 4067 length--; 4068 // Skip over legal field signatures 4069 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4070 while ((length > 0) && (nextp != NULL)) { 4071 args_size++; 4072 if (p[0] == 'J' || p[0] == 'D') { 4073 args_size++; 4074 } 4075 length -= nextp - p; 4076 p = nextp; 4077 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4078 } 4079 // The first non-signature thing better be a ')' 4080 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 4081 length--; 4082 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 4083 // All internal methods must return void 4084 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 4085 return args_size; 4086 } 4087 } else { 4088 // Now we better just have a return value 4089 nextp = skip_over_field_signature(p, true, length, CHECK_0); 4090 if (nextp && ((int)length == (nextp - p))) { 4091 return args_size; 4092 } 4093 } 4094 } 4095 } 4096 // Report error 4097 ResourceMark rm(THREAD); 4098 Exceptions::fthrow( 4099 THREAD_AND_LOCATION, 4100 vmSymbolHandles::java_lang_ClassFormatError(), 4101 "Method \"%s\" in class %s has illegal signature \"%s\"", 4102 name->as_C_string(), _class_name->as_C_string(), p 4103 ); 4104 return 0; 4105 } 4106 4107 4108 // Unqualified names may not contain the characters '.', ';', or '/'. 4109 // Method names also may not contain the characters '<' or '>', unless <init> or <clinit>. 4110 // Note that method names may not be <init> or <clinit> in this method. 4111 // Because these names have been checked as special cases before calling this method 4112 // in verify_legal_method_name. 4113 bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) { 4114 jchar ch; 4115 4116 for (char* p = name; p != name + length; ) { 4117 ch = *p; 4118 if (ch < 128) { 4119 p++; 4120 if (ch == '.' || ch == ';') { 4121 return false; // do not permit '.' or ';' 4122 } 4123 if (type != LegalClass && ch == '/') { 4124 return false; // do not permit '/' unless it's class name 4125 } 4126 if (type == LegalMethod && (ch == '<' || ch == '>')) { 4127 return false; // do not permit '<' or '>' in method names 4128 } 4129 } else { 4130 char* tmp_p = UTF8::next(p, &ch); 4131 p = tmp_p; 4132 } 4133 } 4134 return true; 4135 } 4136 4137 4138 // Take pointer to a string. Skip over the longest part of the string that could 4139 // be taken as a fieldname. Allow '/' if slash_ok is true. 4140 // Return a pointer to just past the fieldname. 4141 // Return NULL if no fieldname at all was found, or in the case of slash_ok 4142 // being true, we saw consecutive slashes (meaning we were looking for a 4143 // qualified path but found something that was badly-formed). 4144 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 4145 char* p; 4146 jchar ch; 4147 jboolean last_is_slash = false; 4148 jboolean not_first_ch = false; 4149 4150 for (p = name; p != name + length; not_first_ch = true) { 4151 char* old_p = p; 4152 ch = *p; 4153 if (ch < 128) { 4154 p++; 4155 // quick check for ascii 4156 if ((ch >= 'a' && ch <= 'z') || 4157 (ch >= 'A' && ch <= 'Z') || 4158 (ch == '_' || ch == '$') || 4159 (not_first_ch && ch >= '0' && ch <= '9')) { 4160 last_is_slash = false; 4161 continue; 4162 } 4163 if (slash_ok && ch == '/') { 4164 if (last_is_slash) { 4165 return NULL; // Don't permit consecutive slashes 4166 } 4167 last_is_slash = true; 4168 continue; 4169 } 4170 } else { 4171 jint unicode_ch; 4172 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4173 p = tmp_p; 4174 last_is_slash = false; 4175 // Check if ch is Java identifier start or is Java identifier part 4176 // 4672820: call java.lang.Character methods directly without generating separate tables. 4177 EXCEPTION_MARK; 4178 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass()); 4179 4180 // return value 4181 JavaValue result(T_BOOLEAN); 4182 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 4183 JavaCallArguments args; 4184 args.push_int(unicode_ch); 4185 4186 // public static boolean isJavaIdentifierStart(char ch); 4187 JavaCalls::call_static(&result, 4188 klass, 4189 vmSymbolHandles::isJavaIdentifierStart_name(), 4190 vmSymbolHandles::int_bool_signature(), 4191 &args, 4192 THREAD); 4193 4194 if (HAS_PENDING_EXCEPTION) { 4195 CLEAR_PENDING_EXCEPTION; 4196 return 0; 4197 } 4198 if (result.get_jboolean()) { 4199 continue; 4200 } 4201 4202 if (not_first_ch) { 4203 // public static boolean isJavaIdentifierPart(char ch); 4204 JavaCalls::call_static(&result, 4205 klass, 4206 vmSymbolHandles::isJavaIdentifierPart_name(), 4207 vmSymbolHandles::int_bool_signature(), 4208 &args, 4209 THREAD); 4210 4211 if (HAS_PENDING_EXCEPTION) { 4212 CLEAR_PENDING_EXCEPTION; 4213 return 0; 4214 } 4215 4216 if (result.get_jboolean()) { 4217 continue; 4218 } 4219 } 4220 } 4221 return (not_first_ch) ? old_p : NULL; 4222 } 4223 return (not_first_ch) ? p : NULL; 4224 } 4225 4226 4227 // Take pointer to a string. Skip over the longest part of the string that could 4228 // be taken as a field signature. Allow "void" if void_ok. 4229 // Return a pointer to just past the signature. 4230 // Return NULL if no legal signature is found. 4231 char* ClassFileParser::skip_over_field_signature(char* signature, 4232 bool void_ok, 4233 unsigned int length, 4234 TRAPS) { 4235 unsigned int array_dim = 0; 4236 while (length > 0) { 4237 switch (signature[0]) { 4238 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 4239 case JVM_SIGNATURE_BOOLEAN: 4240 case JVM_SIGNATURE_BYTE: 4241 case JVM_SIGNATURE_CHAR: 4242 case JVM_SIGNATURE_SHORT: 4243 case JVM_SIGNATURE_INT: 4244 case JVM_SIGNATURE_FLOAT: 4245 case JVM_SIGNATURE_LONG: 4246 case JVM_SIGNATURE_DOUBLE: 4247 return signature + 1; 4248 case JVM_SIGNATURE_CLASS: { 4249 if (_major_version < JAVA_1_5_VERSION) { 4250 // Skip over the class name if one is there 4251 char* p = skip_over_field_name(signature + 1, true, --length); 4252 4253 // The next character better be a semicolon 4254 if (p && (p - signature) > 1 && p[0] == ';') { 4255 return p + 1; 4256 } 4257 } else { 4258 // 4900761: For class version > 48, any unicode is allowed in class name. 4259 length--; 4260 signature++; 4261 while (length > 0 && signature[0] != ';') { 4262 if (signature[0] == '.') { 4263 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 4264 } 4265 length--; 4266 signature++; 4267 } 4268 if (signature[0] == ';') { return signature + 1; } 4269 } 4270 4271 return NULL; 4272 } 4273 case JVM_SIGNATURE_ARRAY: 4274 array_dim++; 4275 if (array_dim > 255) { 4276 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4277 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 4278 } 4279 // The rest of what's there better be a legal signature 4280 signature++; 4281 length--; 4282 void_ok = false; 4283 break; 4284 4285 default: 4286 return NULL; 4287 } 4288 } 4289 return NULL; 4290 }