classFileParser.cpp revision 113:ba764ed4b6f2
1/* 2 * Copyright 1997-2007 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 50 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#define JAVA_6_VERSION 50 48 49 50void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) { 51 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 52 // this function (_current can be allocated in a register, with scalar 53 // replacement of aggregates). The _current pointer is copied back to 54 // stream() when this function returns. DON'T call another method within 55 // this method that uses stream(). 56 ClassFileStream* cfs0 = stream(); 57 ClassFileStream cfs1 = *cfs0; 58 ClassFileStream* cfs = &cfs1; 59#ifdef ASSERT 60 u1* old_current = cfs0->current(); 61#endif 62 63 // Used for batching symbol allocations. 64 const char* names[SymbolTable::symbol_alloc_batch_size]; 65 int lengths[SymbolTable::symbol_alloc_batch_size]; 66 int indices[SymbolTable::symbol_alloc_batch_size]; 67 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 68 int names_count = 0; 69 70 // parsing Index 0 is unused 71 for (int index = 1; index < length; index++) { 72 // Each of the following case guarantees one more byte in the stream 73 // for the following tag or the access_flags following constant pool, 74 // so we don't need bounds-check for reading tag. 75 u1 tag = cfs->get_u1_fast(); 76 switch (tag) { 77 case JVM_CONSTANT_Class : 78 { 79 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 80 u2 name_index = cfs->get_u2_fast(); 81 cp->klass_index_at_put(index, name_index); 82 } 83 break; 84 case JVM_CONSTANT_Fieldref : 85 { 86 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 87 u2 class_index = cfs->get_u2_fast(); 88 u2 name_and_type_index = cfs->get_u2_fast(); 89 cp->field_at_put(index, class_index, name_and_type_index); 90 } 91 break; 92 case JVM_CONSTANT_Methodref : 93 { 94 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 95 u2 class_index = cfs->get_u2_fast(); 96 u2 name_and_type_index = cfs->get_u2_fast(); 97 cp->method_at_put(index, class_index, name_and_type_index); 98 } 99 break; 100 case JVM_CONSTANT_InterfaceMethodref : 101 { 102 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 103 u2 class_index = cfs->get_u2_fast(); 104 u2 name_and_type_index = cfs->get_u2_fast(); 105 cp->interface_method_at_put(index, class_index, name_and_type_index); 106 } 107 break; 108 case JVM_CONSTANT_String : 109 { 110 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 111 u2 string_index = cfs->get_u2_fast(); 112 cp->string_index_at_put(index, string_index); 113 } 114 break; 115 case JVM_CONSTANT_Integer : 116 { 117 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 118 u4 bytes = cfs->get_u4_fast(); 119 cp->int_at_put(index, (jint) bytes); 120 } 121 break; 122 case JVM_CONSTANT_Float : 123 { 124 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 125 u4 bytes = cfs->get_u4_fast(); 126 cp->float_at_put(index, *(jfloat*)&bytes); 127 } 128 break; 129 case JVM_CONSTANT_Long : 130 // A mangled type might cause you to overrun allocated memory 131 guarantee_property(index+1 < length, 132 "Invalid constant pool entry %u in class file %s", 133 index, CHECK); 134 { 135 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 136 u8 bytes = cfs->get_u8_fast(); 137 cp->long_at_put(index, bytes); 138 } 139 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 140 break; 141 case JVM_CONSTANT_Double : 142 // A mangled type might cause you to overrun allocated memory 143 guarantee_property(index+1 < length, 144 "Invalid constant pool entry %u in class file %s", 145 index, CHECK); 146 { 147 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 148 u8 bytes = cfs->get_u8_fast(); 149 cp->double_at_put(index, *(jdouble*)&bytes); 150 } 151 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 152 break; 153 case JVM_CONSTANT_NameAndType : 154 { 155 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 156 u2 name_index = cfs->get_u2_fast(); 157 u2 signature_index = cfs->get_u2_fast(); 158 cp->name_and_type_at_put(index, name_index, signature_index); 159 } 160 break; 161 case JVM_CONSTANT_Utf8 : 162 { 163 cfs->guarantee_more(2, CHECK); // utf8_length 164 u2 utf8_length = cfs->get_u2_fast(); 165 u1* utf8_buffer = cfs->get_u1_buffer(); 166 assert(utf8_buffer != NULL, "null utf8 buffer"); 167 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 168 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 169 cfs->skip_u1_fast(utf8_length); 170 // Before storing the symbol, make sure it's legal 171 if (_need_verify) { 172 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 173 } 174 175 unsigned int hash; 176 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 177 if (result == NULL) { 178 names[names_count] = (char*)utf8_buffer; 179 lengths[names_count] = utf8_length; 180 indices[names_count] = index; 181 hashValues[names_count++] = hash; 182 if (names_count == SymbolTable::symbol_alloc_batch_size) { 183 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 184 names_count = 0; 185 } 186 } else { 187 cp->symbol_at_put(index, result); 188 } 189 } 190 break; 191 default: 192 classfile_parse_error( 193 "Unknown constant tag %u in class file %s", tag, CHECK); 194 break; 195 } 196 } 197 198 // Allocate the remaining symbols 199 if (names_count > 0) { 200 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 201 } 202 203 // Copy _current pointer of local copy back to stream(). 204#ifdef ASSERT 205 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 206#endif 207 cfs0->set_current(cfs1.current()); 208} 209 210bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 211 212constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 213 ClassFileStream* cfs = stream(); 214 constantPoolHandle nullHandle; 215 216 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 217 u2 length = cfs->get_u2_fast(); 218 guarantee_property( 219 length >= 1, "Illegal constant pool size %u in class file %s", 220 length, CHECK_(nullHandle)); 221 constantPoolOop constant_pool = 222 oopFactory::new_constantPool(length, CHECK_(nullHandle)); 223 constantPoolHandle cp (THREAD, constant_pool); 224 225 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops 226 227 // parsing constant pool entries 228 parse_constant_pool_entries(cp, length, CHECK_(nullHandle)); 229 230 int index = 1; // declared outside of loops for portability 231 232 // first verification pass - validate cross references and fixup class and string constants 233 for (index = 1; index < length; index++) { // Index 0 is unused 234 switch (cp->tag_at(index).value()) { 235 case JVM_CONSTANT_Class : 236 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 237 break; 238 case JVM_CONSTANT_Fieldref : 239 // fall through 240 case JVM_CONSTANT_Methodref : 241 // fall through 242 case JVM_CONSTANT_InterfaceMethodref : { 243 if (!_need_verify) break; 244 int klass_ref_index = cp->klass_ref_index_at(index); 245 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 246 check_property(valid_cp_range(klass_ref_index, length) && 247 cp->tag_at(klass_ref_index).is_klass_reference(), 248 "Invalid constant pool index %u in class file %s", 249 klass_ref_index, 250 CHECK_(nullHandle)); 251 check_property(valid_cp_range(name_and_type_ref_index, length) && 252 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 253 "Invalid constant pool index %u in class file %s", 254 name_and_type_ref_index, 255 CHECK_(nullHandle)); 256 break; 257 } 258 case JVM_CONSTANT_String : 259 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 260 break; 261 case JVM_CONSTANT_Integer : 262 break; 263 case JVM_CONSTANT_Float : 264 break; 265 case JVM_CONSTANT_Long : 266 case JVM_CONSTANT_Double : 267 index++; 268 check_property( 269 (index < length && cp->tag_at(index).is_invalid()), 270 "Improper constant pool long/double index %u in class file %s", 271 index, CHECK_(nullHandle)); 272 break; 273 case JVM_CONSTANT_NameAndType : { 274 if (!_need_verify) break; 275 int name_ref_index = cp->name_ref_index_at(index); 276 int signature_ref_index = cp->signature_ref_index_at(index); 277 check_property( 278 valid_cp_range(name_ref_index, length) && 279 cp->tag_at(name_ref_index).is_utf8(), 280 "Invalid constant pool index %u in class file %s", 281 name_ref_index, CHECK_(nullHandle)); 282 check_property( 283 valid_cp_range(signature_ref_index, length) && 284 cp->tag_at(signature_ref_index).is_utf8(), 285 "Invalid constant pool index %u in class file %s", 286 signature_ref_index, CHECK_(nullHandle)); 287 break; 288 } 289 case JVM_CONSTANT_Utf8 : 290 break; 291 case JVM_CONSTANT_UnresolvedClass : // fall-through 292 case JVM_CONSTANT_UnresolvedClassInError: 293 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 294 break; 295 case JVM_CONSTANT_ClassIndex : 296 { 297 int class_index = cp->klass_index_at(index); 298 check_property( 299 valid_cp_range(class_index, length) && 300 cp->tag_at(class_index).is_utf8(), 301 "Invalid constant pool index %u in class file %s", 302 class_index, CHECK_(nullHandle)); 303 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 304 } 305 break; 306 case JVM_CONSTANT_UnresolvedString : 307 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 308 break; 309 case JVM_CONSTANT_StringIndex : 310 { 311 int string_index = cp->string_index_at(index); 312 check_property( 313 valid_cp_range(string_index, length) && 314 cp->tag_at(string_index).is_utf8(), 315 "Invalid constant pool index %u in class file %s", 316 string_index, CHECK_(nullHandle)); 317 symbolOop sym = cp->symbol_at(string_index); 318 cp->unresolved_string_at_put(index, sym); 319 } 320 break; 321 default: 322 fatal1("bad constant pool tag value %u", cp->tag_at(index).value()); 323 ShouldNotReachHere(); 324 break; 325 } // end of switch 326 } // end of for 327 328 if (!_need_verify) { 329 return cp; 330 } 331 332 // second verification pass - checks the strings are of the right format. 333 for (index = 1; index < length; index++) { 334 jbyte tag = cp->tag_at(index).value(); 335 switch (tag) { 336 case JVM_CONSTANT_UnresolvedClass: { 337 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index)); 338 verify_legal_class_name(class_name, CHECK_(nullHandle)); 339 break; 340 } 341 case JVM_CONSTANT_Fieldref: 342 case JVM_CONSTANT_Methodref: 343 case JVM_CONSTANT_InterfaceMethodref: { 344 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 345 // already verified to be utf8 346 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 347 // already verified to be utf8 348 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 349 symbolHandle name(THREAD, cp->symbol_at(name_ref_index)); 350 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index)); 351 if (tag == JVM_CONSTANT_Fieldref) { 352 verify_legal_field_name(name, CHECK_(nullHandle)); 353 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 354 } else { 355 verify_legal_method_name(name, CHECK_(nullHandle)); 356 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 357 if (tag == JVM_CONSTANT_Methodref) { 358 // 4509014: If a class method name begins with '<', it must be "<init>". 359 assert(!name.is_null(), "method name in constant pool is null"); 360 unsigned int name_len = name->utf8_length(); 361 assert(name_len > 0, "bad method name"); // already verified as legal name 362 if (name->byte_at(0) == '<') { 363 if (name() != vmSymbols::object_initializer_name()) { 364 classfile_parse_error( 365 "Bad method name at constant pool index %u in class file %s", 366 name_ref_index, CHECK_(nullHandle)); 367 } 368 } 369 } 370 } 371 break; 372 } 373 } // end of switch 374 } // end of for 375 376 return cp; 377} 378 379 380class NameSigHash: public ResourceObj { 381 public: 382 symbolOop _name; // name 383 symbolOop _sig; // signature 384 NameSigHash* _next; // Next entry in hash table 385}; 386 387 388#define HASH_ROW_SIZE 256 389 390unsigned int hash(symbolOop name, symbolOop sig) { 391 unsigned int raw_hash = 0; 392 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 393 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 394 395 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 396} 397 398 399void initialize_hashtable(NameSigHash** table) { 400 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 401} 402 403// Return false if the name/sig combination is found in table. 404// Return true if no duplicate is found. And name/sig is added as a new entry in table. 405// The old format checker uses heap sort to find duplicates. 406// NOTE: caller should guarantee that GC doesn't happen during the life cycle 407// of table since we don't expect symbolOop's to move. 408bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) { 409 assert(name != NULL, "name in constant pool is NULL"); 410 411 // First lookup for duplicates 412 int index = hash(name, sig); 413 NameSigHash* entry = table[index]; 414 while (entry != NULL) { 415 if (entry->_name == name && entry->_sig == sig) { 416 return false; 417 } 418 entry = entry->_next; 419 } 420 421 // No duplicate is found, allocate a new entry and fill it. 422 entry = new NameSigHash(); 423 entry->_name = name; 424 entry->_sig = sig; 425 426 // Insert into hash table 427 entry->_next = table[index]; 428 table[index] = entry; 429 430 return true; 431} 432 433 434objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp, 435 int length, 436 Handle class_loader, 437 Handle protection_domain, 438 PerfTraceTime* vmtimer, 439 symbolHandle class_name, 440 TRAPS) { 441 ClassFileStream* cfs = stream(); 442 assert(length > 0, "only called for length>0"); 443 objArrayHandle nullHandle; 444 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 445 objArrayHandle interfaces (THREAD, interface_oop); 446 447 int index; 448 for (index = 0; index < length; index++) { 449 u2 interface_index = cfs->get_u2(CHECK_(nullHandle)); 450 check_property( 451 valid_cp_range(interface_index, cp->length()) && 452 cp->tag_at(interface_index).is_unresolved_klass(), 453 "Interface name has bad constant pool index %u in class file %s", 454 interface_index, CHECK_(nullHandle)); 455 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index)); 456 457 // Don't need to check legal name because it's checked when parsing constant pool. 458 // But need to make sure it's not an array type. 459 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 460 "Bad interface name in class file %s", CHECK_(nullHandle)); 461 462 vmtimer->suspend(); // do not count recursive loading twice 463 // Call resolve_super so classcircularity is checked 464 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 465 unresolved_klass, class_loader, protection_domain, 466 false, CHECK_(nullHandle)); 467 KlassHandle interf (THREAD, k); 468 vmtimer->resume(); 469 470 if (!Klass::cast(interf())->is_interface()) { 471 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle); 472 } 473 interfaces->obj_at_put(index, interf()); 474 } 475 476 if (!_need_verify || length <= 1) { 477 return interfaces; 478 } 479 480 // Check if there's any duplicates in interfaces 481 ResourceMark rm(THREAD); 482 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 483 THREAD, NameSigHash*, HASH_ROW_SIZE); 484 initialize_hashtable(interface_names); 485 bool dup = false; 486 { 487 debug_only(No_Safepoint_Verifier nsv;) 488 for (index = 0; index < length; index++) { 489 klassOop k = (klassOop)interfaces->obj_at(index); 490 symbolOop name = instanceKlass::cast(k)->name(); 491 // If no duplicates, add (name, NULL) in hashtable interface_names. 492 if (!put_after_lookup(name, NULL, interface_names)) { 493 dup = true; 494 break; 495 } 496 } 497 } 498 if (dup) { 499 classfile_parse_error("Duplicate interface name in class file %s", 500 CHECK_(nullHandle)); 501 } 502 503 return interfaces; 504} 505 506 507void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) { 508 // Make sure the constant pool entry is of a type appropriate to this field 509 guarantee_property( 510 (constantvalue_index > 0 && 511 constantvalue_index < cp->length()), 512 "Bad initial value index %u in ConstantValue attribute in class file %s", 513 constantvalue_index, CHECK); 514 constantTag value_type = cp->tag_at(constantvalue_index); 515 switch ( cp->basic_type_for_signature_at(signature_index) ) { 516 case T_LONG: 517 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 518 break; 519 case T_FLOAT: 520 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 521 break; 522 case T_DOUBLE: 523 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 524 break; 525 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 526 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 527 break; 528 case T_OBJECT: 529 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18) 530 && (value_type.is_string() || value_type.is_unresolved_string())), 531 "Bad string initial value in class file %s", CHECK); 532 break; 533 default: 534 classfile_parse_error( 535 "Unable to set initial value %u in class file %s", 536 constantvalue_index, CHECK); 537 } 538} 539 540 541// Parse attributes for a field. 542void ClassFileParser::parse_field_attributes(constantPoolHandle cp, 543 u2 attributes_count, 544 bool is_static, u2 signature_index, 545 u2* constantvalue_index_addr, 546 bool* is_synthetic_addr, 547 u2* generic_signature_index_addr, 548 typeArrayHandle* field_annotations, 549 TRAPS) { 550 ClassFileStream* cfs = stream(); 551 assert(attributes_count > 0, "length should be greater than 0"); 552 u2 constantvalue_index = 0; 553 u2 generic_signature_index = 0; 554 bool is_synthetic = false; 555 u1* runtime_visible_annotations = NULL; 556 int runtime_visible_annotations_length = 0; 557 u1* runtime_invisible_annotations = NULL; 558 int runtime_invisible_annotations_length = 0; 559 while (attributes_count--) { 560 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 561 u2 attribute_name_index = cfs->get_u2_fast(); 562 u4 attribute_length = cfs->get_u4_fast(); 563 check_property(valid_cp_range(attribute_name_index, cp->length()) && 564 cp->tag_at(attribute_name_index).is_utf8(), 565 "Invalid field attribute index %u in class file %s", 566 attribute_name_index, 567 CHECK); 568 symbolOop attribute_name = cp->symbol_at(attribute_name_index); 569 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 570 // ignore if non-static 571 if (constantvalue_index != 0) { 572 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 573 } 574 check_property( 575 attribute_length == 2, 576 "Invalid ConstantValue field attribute length %u in class file %s", 577 attribute_length, CHECK); 578 constantvalue_index = cfs->get_u2(CHECK); 579 if (_need_verify) { 580 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK); 581 } 582 } else if (attribute_name == vmSymbols::tag_synthetic()) { 583 if (attribute_length != 0) { 584 classfile_parse_error( 585 "Invalid Synthetic field attribute length %u in class file %s", 586 attribute_length, CHECK); 587 } 588 is_synthetic = true; 589 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 590 if (attribute_length != 0) { 591 classfile_parse_error( 592 "Invalid Deprecated field attribute length %u in class file %s", 593 attribute_length, CHECK); 594 } 595 } else if (_major_version >= JAVA_1_5_VERSION) { 596 if (attribute_name == vmSymbols::tag_signature()) { 597 if (attribute_length != 2) { 598 classfile_parse_error( 599 "Wrong size %u for field's Signature attribute in class file %s", 600 attribute_length, CHECK); 601 } 602 generic_signature_index = cfs->get_u2(CHECK); 603 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 604 runtime_visible_annotations_length = attribute_length; 605 runtime_visible_annotations = cfs->get_u1_buffer(); 606 assert(runtime_visible_annotations != NULL, "null visible annotations"); 607 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 608 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 609 runtime_invisible_annotations_length = attribute_length; 610 runtime_invisible_annotations = cfs->get_u1_buffer(); 611 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 612 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 613 } else { 614 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 615 } 616 } else { 617 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 618 } 619 } 620 621 *constantvalue_index_addr = constantvalue_index; 622 *is_synthetic_addr = is_synthetic; 623 *generic_signature_index_addr = generic_signature_index; 624 *field_annotations = assemble_annotations(runtime_visible_annotations, 625 runtime_visible_annotations_length, 626 runtime_invisible_annotations, 627 runtime_invisible_annotations_length, 628 CHECK); 629 return; 630} 631 632 633// Field allocation types. Used for computing field offsets. 634 635enum FieldAllocationType { 636 STATIC_OOP, // Oops 637 STATIC_BYTE, // Boolean, Byte, char 638 STATIC_SHORT, // shorts 639 STATIC_WORD, // ints 640 STATIC_DOUBLE, // long or double 641 STATIC_ALIGNED_DOUBLE,// aligned long or double 642 NONSTATIC_OOP, 643 NONSTATIC_BYTE, 644 NONSTATIC_SHORT, 645 NONSTATIC_WORD, 646 NONSTATIC_DOUBLE, 647 NONSTATIC_ALIGNED_DOUBLE 648}; 649 650 651struct FieldAllocationCount { 652 int static_oop_count; 653 int static_byte_count; 654 int static_short_count; 655 int static_word_count; 656 int static_double_count; 657 int nonstatic_oop_count; 658 int nonstatic_byte_count; 659 int nonstatic_short_count; 660 int nonstatic_word_count; 661 int nonstatic_double_count; 662}; 663 664typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface, 665 struct FieldAllocationCount *fac, 666 objArrayHandle* fields_annotations, TRAPS) { 667 ClassFileStream* cfs = stream(); 668 typeArrayHandle nullHandle; 669 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 670 u2 length = cfs->get_u2_fast(); 671 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index] 672 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle)); 673 typeArrayHandle fields(THREAD, new_fields); 674 675 int index = 0; 676 typeArrayHandle field_annotations; 677 for (int n = 0; n < length; n++) { 678 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 679 680 AccessFlags access_flags; 681 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 682 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle)); 683 access_flags.set_flags(flags); 684 685 u2 name_index = cfs->get_u2_fast(); 686 int cp_size = cp->length(); 687 check_property( 688 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), 689 "Invalid constant pool index %u for field name in class file %s", 690 name_index, CHECK_(nullHandle)); 691 symbolHandle name(THREAD, cp->symbol_at(name_index)); 692 verify_legal_field_name(name, CHECK_(nullHandle)); 693 694 u2 signature_index = cfs->get_u2_fast(); 695 check_property( 696 valid_cp_range(signature_index, cp_size) && 697 cp->tag_at(signature_index).is_utf8(), 698 "Invalid constant pool index %u for field signature in class file %s", 699 signature_index, CHECK_(nullHandle)); 700 symbolHandle sig(THREAD, cp->symbol_at(signature_index)); 701 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 702 703 u2 constantvalue_index = 0; 704 bool is_synthetic = false; 705 u2 generic_signature_index = 0; 706 bool is_static = access_flags.is_static(); 707 708 u2 attributes_count = cfs->get_u2_fast(); 709 if (attributes_count > 0) { 710 parse_field_attributes(cp, attributes_count, is_static, signature_index, 711 &constantvalue_index, &is_synthetic, 712 &generic_signature_index, &field_annotations, 713 CHECK_(nullHandle)); 714 if (field_annotations.not_null()) { 715 if (fields_annotations->is_null()) { 716 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 717 *fields_annotations = objArrayHandle(THREAD, md); 718 } 719 (*fields_annotations)->obj_at_put(n, field_annotations()); 720 } 721 if (is_synthetic) { 722 access_flags.set_is_synthetic(); 723 } 724 } 725 726 fields->short_at_put(index++, access_flags.as_short()); 727 fields->short_at_put(index++, name_index); 728 fields->short_at_put(index++, signature_index); 729 fields->short_at_put(index++, constantvalue_index); 730 731 // Remember how many oops we encountered and compute allocation type 732 BasicType type = cp->basic_type_for_signature_at(signature_index); 733 FieldAllocationType atype; 734 if ( is_static ) { 735 switch ( type ) { 736 case T_BOOLEAN: 737 case T_BYTE: 738 fac->static_byte_count++; 739 atype = STATIC_BYTE; 740 break; 741 case T_LONG: 742 case T_DOUBLE: 743 if (Universe::field_type_should_be_aligned(type)) { 744 atype = STATIC_ALIGNED_DOUBLE; 745 } else { 746 atype = STATIC_DOUBLE; 747 } 748 fac->static_double_count++; 749 break; 750 case T_CHAR: 751 case T_SHORT: 752 fac->static_short_count++; 753 atype = STATIC_SHORT; 754 break; 755 case T_FLOAT: 756 case T_INT: 757 fac->static_word_count++; 758 atype = STATIC_WORD; 759 break; 760 case T_ARRAY: 761 case T_OBJECT: 762 fac->static_oop_count++; 763 atype = STATIC_OOP; 764 break; 765 case T_ADDRESS: 766 case T_VOID: 767 default: 768 assert(0, "bad field type"); 769 } 770 } else { 771 switch ( type ) { 772 case T_BOOLEAN: 773 case T_BYTE: 774 fac->nonstatic_byte_count++; 775 atype = NONSTATIC_BYTE; 776 break; 777 case T_LONG: 778 case T_DOUBLE: 779 if (Universe::field_type_should_be_aligned(type)) { 780 atype = NONSTATIC_ALIGNED_DOUBLE; 781 } else { 782 atype = NONSTATIC_DOUBLE; 783 } 784 fac->nonstatic_double_count++; 785 break; 786 case T_CHAR: 787 case T_SHORT: 788 fac->nonstatic_short_count++; 789 atype = NONSTATIC_SHORT; 790 break; 791 case T_FLOAT: 792 case T_INT: 793 fac->nonstatic_word_count++; 794 atype = NONSTATIC_WORD; 795 break; 796 case T_ARRAY: 797 case T_OBJECT: 798 fac->nonstatic_oop_count++; 799 atype = NONSTATIC_OOP; 800 break; 801 case T_ADDRESS: 802 case T_VOID: 803 default: 804 assert(0, "bad field type"); 805 } 806 } 807 808 // The correct offset is computed later (all oop fields will be located together) 809 // We temporarily store the allocation type in the offset field 810 fields->short_at_put(index++, atype); 811 fields->short_at_put(index++, 0); // Clear out high word of byte offset 812 fields->short_at_put(index++, generic_signature_index); 813 } 814 815 if (_need_verify && length > 1) { 816 // Check duplicated fields 817 ResourceMark rm(THREAD); 818 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 819 THREAD, NameSigHash*, HASH_ROW_SIZE); 820 initialize_hashtable(names_and_sigs); 821 bool dup = false; 822 { 823 debug_only(No_Safepoint_Verifier nsv;) 824 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) { 825 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); 826 symbolOop name = cp->symbol_at(name_index); 827 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); 828 symbolOop sig = cp->symbol_at(sig_index); 829 // If no duplicates, add name/signature in hashtable names_and_sigs. 830 if (!put_after_lookup(name, sig, names_and_sigs)) { 831 dup = true; 832 break; 833 } 834 } 835 } 836 if (dup) { 837 classfile_parse_error("Duplicate field name&signature in class file %s", 838 CHECK_(nullHandle)); 839 } 840 } 841 842 return fields; 843} 844 845 846static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 847 while (length-- > 0) { 848 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 849 } 850} 851 852 853typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length, 854 u4 exception_table_length, 855 constantPoolHandle cp, 856 TRAPS) { 857 ClassFileStream* cfs = stream(); 858 typeArrayHandle nullHandle; 859 860 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index] 861 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle)); 862 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh); 863 864 int index = 0; 865 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index 866 for (unsigned int i = 0; i < exception_table_length; i++) { 867 u2 start_pc = cfs->get_u2_fast(); 868 u2 end_pc = cfs->get_u2_fast(); 869 u2 handler_pc = cfs->get_u2_fast(); 870 u2 catch_type_index = cfs->get_u2_fast(); 871 // Will check legal target after parsing code array in verifier. 872 if (_need_verify) { 873 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 874 "Illegal exception table range in class file %s", CHECK_(nullHandle)); 875 guarantee_property(handler_pc < code_length, 876 "Illegal exception table handler in class file %s", CHECK_(nullHandle)); 877 if (catch_type_index != 0) { 878 guarantee_property(valid_cp_range(catch_type_index, cp->length()) && 879 (cp->tag_at(catch_type_index).is_klass() || 880 cp->tag_at(catch_type_index).is_unresolved_klass()), 881 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle)); 882 } 883 } 884 exception_handlers->int_at_put(index++, start_pc); 885 exception_handlers->int_at_put(index++, end_pc); 886 exception_handlers->int_at_put(index++, handler_pc); 887 exception_handlers->int_at_put(index++, catch_type_index); 888 } 889 return exception_handlers; 890} 891 892void ClassFileParser::parse_linenumber_table( 893 u4 code_attribute_length, u4 code_length, 894 CompressedLineNumberWriteStream** write_stream, TRAPS) { 895 ClassFileStream* cfs = stream(); 896 unsigned int num_entries = cfs->get_u2(CHECK); 897 898 // Each entry is a u2 start_pc, and a u2 line_number 899 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 900 901 // Verify line number attribute and table length 902 check_property( 903 code_attribute_length == sizeof(u2) + length_in_bytes, 904 "LineNumberTable attribute has wrong length in class file %s", CHECK); 905 906 cfs->guarantee_more(length_in_bytes, CHECK); 907 908 if ((*write_stream) == NULL) { 909 if (length_in_bytes > fixed_buffer_size) { 910 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 911 } else { 912 (*write_stream) = new CompressedLineNumberWriteStream( 913 linenumbertable_buffer, fixed_buffer_size); 914 } 915 } 916 917 while (num_entries-- > 0) { 918 u2 bci = cfs->get_u2_fast(); // start_pc 919 u2 line = cfs->get_u2_fast(); // line_number 920 guarantee_property(bci < code_length, 921 "Invalid pc in LineNumberTable in class file %s", CHECK); 922 (*write_stream)->write_pair(bci, line); 923 } 924} 925 926 927// Class file LocalVariableTable elements. 928class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 929 public: 930 u2 start_bci; 931 u2 length; 932 u2 name_cp_index; 933 u2 descriptor_cp_index; 934 u2 slot; 935}; 936 937 938class LVT_Hash: public CHeapObj { 939 public: 940 LocalVariableTableElement *_elem; // element 941 LVT_Hash* _next; // Next entry in hash table 942}; 943 944unsigned int hash(LocalVariableTableElement *elem) { 945 unsigned int raw_hash = elem->start_bci; 946 947 raw_hash = elem->length + raw_hash * 37; 948 raw_hash = elem->name_cp_index + raw_hash * 37; 949 raw_hash = elem->slot + raw_hash * 37; 950 951 return raw_hash % HASH_ROW_SIZE; 952} 953 954void initialize_hashtable(LVT_Hash** table) { 955 for (int i = 0; i < HASH_ROW_SIZE; i++) { 956 table[i] = NULL; 957 } 958} 959 960void clear_hashtable(LVT_Hash** table) { 961 for (int i = 0; i < HASH_ROW_SIZE; i++) { 962 LVT_Hash* current = table[i]; 963 LVT_Hash* next; 964 while (current != NULL) { 965 next = current->_next; 966 current->_next = NULL; 967 delete(current); 968 current = next; 969 } 970 table[i] = NULL; 971 } 972} 973 974LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 975 LVT_Hash* entry = table[index]; 976 977 /* 978 * 3-tuple start_bci/length/slot has to be unique key, 979 * so the following comparison seems to be redundant: 980 * && elem->name_cp_index == entry->_elem->name_cp_index 981 */ 982 while (entry != NULL) { 983 if (elem->start_bci == entry->_elem->start_bci 984 && elem->length == entry->_elem->length 985 && elem->name_cp_index == entry->_elem->name_cp_index 986 && elem->slot == entry->_elem->slot 987 ) { 988 return entry; 989 } 990 entry = entry->_next; 991 } 992 return NULL; 993} 994 995// Return false if the local variable is found in table. 996// Return true if no duplicate is found. 997// And local variable is added as a new entry in table. 998bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 999 // First lookup for duplicates 1000 int index = hash(elem); 1001 LVT_Hash* entry = LVT_lookup(elem, index, table); 1002 1003 if (entry != NULL) { 1004 return false; 1005 } 1006 // No duplicate is found, allocate a new entry and fill it. 1007 if ((entry = new LVT_Hash()) == NULL) { 1008 return false; 1009 } 1010 entry->_elem = elem; 1011 1012 // Insert into hash table 1013 entry->_next = table[index]; 1014 table[index] = entry; 1015 1016 return true; 1017} 1018 1019void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1020 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1021 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1022 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1023 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1024 lvt->signature_cp_index = 0; 1025 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1026} 1027 1028// Function is used to parse both attributes: 1029// LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1030u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1031 u2 max_locals, 1032 u4 code_attribute_length, 1033 constantPoolHandle cp, 1034 u2* localvariable_table_length, 1035 bool isLVTT, 1036 TRAPS) { 1037 ClassFileStream* cfs = stream(); 1038 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1039 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1040 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1041 // Verify local variable table attribute has right length 1042 if (_need_verify) { 1043 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1044 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1045 } 1046 u2* localvariable_table_start = cfs->get_u2_buffer(); 1047 assert(localvariable_table_start != NULL, "null local variable table"); 1048 if (!_need_verify) { 1049 cfs->skip_u2_fast(size); 1050 } else { 1051 cfs->guarantee_more(size * 2, CHECK_NULL); 1052 for(int i = 0; i < (*localvariable_table_length); i++) { 1053 u2 start_pc = cfs->get_u2_fast(); 1054 u2 length = cfs->get_u2_fast(); 1055 u2 name_index = cfs->get_u2_fast(); 1056 u2 descriptor_index = cfs->get_u2_fast(); 1057 u2 index = cfs->get_u2_fast(); 1058 // Assign to a u4 to avoid overflow 1059 u4 end_pc = (u4)start_pc + (u4)length; 1060 1061 if (start_pc >= code_length) { 1062 classfile_parse_error( 1063 "Invalid start_pc %u in %s in class file %s", 1064 start_pc, tbl_name, CHECK_NULL); 1065 } 1066 if (end_pc > code_length) { 1067 classfile_parse_error( 1068 "Invalid length %u in %s in class file %s", 1069 length, tbl_name, CHECK_NULL); 1070 } 1071 int cp_size = cp->length(); 1072 guarantee_property( 1073 valid_cp_range(name_index, cp_size) && 1074 cp->tag_at(name_index).is_utf8(), 1075 "Name index %u in %s has bad constant type in class file %s", 1076 name_index, tbl_name, CHECK_NULL); 1077 guarantee_property( 1078 valid_cp_range(descriptor_index, cp_size) && 1079 cp->tag_at(descriptor_index).is_utf8(), 1080 "Signature index %u in %s has bad constant type in class file %s", 1081 descriptor_index, tbl_name, CHECK_NULL); 1082 1083 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1084 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index)); 1085 verify_legal_field_name(name, CHECK_NULL); 1086 u2 extra_slot = 0; 1087 if (!isLVTT) { 1088 verify_legal_field_signature(name, sig, CHECK_NULL); 1089 1090 // 4894874: check special cases for double and long local variables 1091 if (sig() == vmSymbols::type_signature(T_DOUBLE) || 1092 sig() == vmSymbols::type_signature(T_LONG)) { 1093 extra_slot = 1; 1094 } 1095 } 1096 guarantee_property((index + extra_slot) < max_locals, 1097 "Invalid index %u in %s in class file %s", 1098 index, tbl_name, CHECK_NULL); 1099 } 1100 } 1101 return localvariable_table_start; 1102} 1103 1104 1105void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1106 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) { 1107 ClassFileStream* cfs = stream(); 1108 u2 index = 0; // index in the array with long/double occupying two slots 1109 u4 i1 = *u1_index; 1110 u4 i2 = *u2_index + 1; 1111 for(int i = 0; i < array_length; i++) { 1112 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1113 index++; 1114 if (tag == ITEM_Long || tag == ITEM_Double) { 1115 index++; 1116 } else if (tag == ITEM_Object) { 1117 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1118 guarantee_property(valid_cp_range(class_index, cp->length()) && 1119 cp->tag_at(class_index).is_unresolved_klass(), 1120 "Bad class index %u in StackMap in class file %s", 1121 class_index, CHECK); 1122 } else if (tag == ITEM_Uninitialized) { 1123 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1124 guarantee_property( 1125 offset < code_length, 1126 "Bad uninitialized type offset %u in StackMap in class file %s", 1127 offset, CHECK); 1128 } else { 1129 guarantee_property( 1130 tag <= (u1)ITEM_Uninitialized, 1131 "Unknown variable type %u in StackMap in class file %s", 1132 tag, CHECK); 1133 } 1134 } 1135 u2_array[*u2_index] = index; 1136 *u1_index = i1; 1137 *u2_index = i2; 1138} 1139 1140typeArrayOop ClassFileParser::parse_stackmap_table( 1141 u4 code_attribute_length, TRAPS) { 1142 if (code_attribute_length == 0) 1143 return NULL; 1144 1145 ClassFileStream* cfs = stream(); 1146 u1* stackmap_table_start = cfs->get_u1_buffer(); 1147 assert(stackmap_table_start != NULL, "null stackmap table"); 1148 1149 // check code_attribute_length first 1150 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1151 1152 if (!_need_verify && !DumpSharedSpaces) { 1153 return NULL; 1154 } 1155 1156 typeArrayOop stackmap_data = 1157 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL); 1158 1159 stackmap_data->set_length(code_attribute_length); 1160 memcpy((void*)stackmap_data->byte_at_addr(0), 1161 (void*)stackmap_table_start, code_attribute_length); 1162 return stackmap_data; 1163} 1164 1165u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1166 u4 method_attribute_length, 1167 constantPoolHandle cp, TRAPS) { 1168 ClassFileStream* cfs = stream(); 1169 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1170 *checked_exceptions_length = cfs->get_u2_fast(); 1171 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1172 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1173 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1174 if (!_need_verify) { 1175 cfs->skip_u2_fast(size); 1176 } else { 1177 // Verify each value in the checked exception table 1178 u2 checked_exception; 1179 u2 len = *checked_exceptions_length; 1180 cfs->guarantee_more(2 * len, CHECK_NULL); 1181 for (int i = 0; i < len; i++) { 1182 checked_exception = cfs->get_u2_fast(); 1183 check_property( 1184 valid_cp_range(checked_exception, cp->length()) && 1185 cp->tag_at(checked_exception).is_klass_reference(), 1186 "Exception name has bad type at constant pool %u in class file %s", 1187 checked_exception, CHECK_NULL); 1188 } 1189 } 1190 // check exceptions attribute length 1191 if (_need_verify) { 1192 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1193 sizeof(u2) * size), 1194 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1195 } 1196 return checked_exceptions_start; 1197} 1198 1199 1200#define MAX_ARGS_SIZE 255 1201#define MAX_CODE_SIZE 65535 1202#define INITIAL_MAX_LVT_NUMBER 256 1203 1204// Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1205// attribute is inlined. This is curbersome to avoid since we inline most of the parts in the 1206// methodOop to save footprint, so we only know the size of the resulting methodOop when the 1207// entire method attribute is parsed. 1208// 1209// The promoted_flags parameter is used to pass relevant access_flags 1210// from the method back up to the containing klass. These flag values 1211// are added to klass's access_flags. 1212 1213methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface, 1214 AccessFlags *promoted_flags, 1215 typeArrayHandle* method_annotations, 1216 typeArrayHandle* method_parameter_annotations, 1217 typeArrayHandle* method_default_annotations, 1218 TRAPS) { 1219 ClassFileStream* cfs = stream(); 1220 methodHandle nullHandle; 1221 ResourceMark rm(THREAD); 1222 // Parse fixed parts 1223 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1224 1225 int flags = cfs->get_u2_fast(); 1226 u2 name_index = cfs->get_u2_fast(); 1227 int cp_size = cp->length(); 1228 check_property( 1229 valid_cp_range(name_index, cp_size) && 1230 cp->tag_at(name_index).is_utf8(), 1231 "Illegal constant pool index %u for method name in class file %s", 1232 name_index, CHECK_(nullHandle)); 1233 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1234 verify_legal_method_name(name, CHECK_(nullHandle)); 1235 1236 u2 signature_index = cfs->get_u2_fast(); 1237 guarantee_property( 1238 valid_cp_range(signature_index, cp_size) && 1239 cp->tag_at(signature_index).is_utf8(), 1240 "Illegal constant pool index %u for method signature in class file %s", 1241 signature_index, CHECK_(nullHandle)); 1242 symbolHandle signature(THREAD, cp->symbol_at(signature_index)); 1243 1244 AccessFlags access_flags; 1245 if (name == vmSymbols::class_initializer_name()) { 1246 // We ignore the access flags for a class initializer. (JVM Spec. p. 116) 1247 flags = JVM_ACC_STATIC; 1248 } else { 1249 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 1250 } 1251 1252 int args_size = -1; // only used when _need_verify is true 1253 if (_need_verify) { 1254 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 1255 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 1256 if (args_size > MAX_ARGS_SIZE) { 1257 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 1258 } 1259 } 1260 1261 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 1262 1263 // Default values for code and exceptions attribute elements 1264 u2 max_stack = 0; 1265 u2 max_locals = 0; 1266 u4 code_length = 0; 1267 u1* code_start = 0; 1268 u2 exception_table_length = 0; 1269 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array()); 1270 u2 checked_exceptions_length = 0; 1271 u2* checked_exceptions_start = NULL; 1272 CompressedLineNumberWriteStream* linenumber_table = NULL; 1273 int linenumber_table_length = 0; 1274 int total_lvt_length = 0; 1275 u2 lvt_cnt = 0; 1276 u2 lvtt_cnt = 0; 1277 bool lvt_allocated = false; 1278 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 1279 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 1280 u2* localvariable_table_length; 1281 u2** localvariable_table_start; 1282 u2* localvariable_type_table_length; 1283 u2** localvariable_type_table_start; 1284 bool parsed_code_attribute = false; 1285 bool parsed_checked_exceptions_attribute = false; 1286 bool parsed_stackmap_attribute = false; 1287 // stackmap attribute - JDK1.5 1288 typeArrayHandle stackmap_data; 1289 u2 generic_signature_index = 0; 1290 u1* runtime_visible_annotations = NULL; 1291 int runtime_visible_annotations_length = 0; 1292 u1* runtime_invisible_annotations = NULL; 1293 int runtime_invisible_annotations_length = 0; 1294 u1* runtime_visible_parameter_annotations = NULL; 1295 int runtime_visible_parameter_annotations_length = 0; 1296 u1* runtime_invisible_parameter_annotations = NULL; 1297 int runtime_invisible_parameter_annotations_length = 0; 1298 u1* annotation_default = NULL; 1299 int annotation_default_length = 0; 1300 1301 // Parse code and exceptions attribute 1302 u2 method_attributes_count = cfs->get_u2_fast(); 1303 while (method_attributes_count--) { 1304 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 1305 u2 method_attribute_name_index = cfs->get_u2_fast(); 1306 u4 method_attribute_length = cfs->get_u4_fast(); 1307 check_property( 1308 valid_cp_range(method_attribute_name_index, cp_size) && 1309 cp->tag_at(method_attribute_name_index).is_utf8(), 1310 "Invalid method attribute name index %u in class file %s", 1311 method_attribute_name_index, CHECK_(nullHandle)); 1312 1313 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index); 1314 if (method_attribute_name == vmSymbols::tag_code()) { 1315 // Parse Code attribute 1316 if (_need_verify) { 1317 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(), 1318 "Code attribute in native or abstract methods in class file %s", 1319 CHECK_(nullHandle)); 1320 } 1321 if (parsed_code_attribute) { 1322 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 1323 } 1324 parsed_code_attribute = true; 1325 1326 // Stack size, locals size, and code size 1327 if (_major_version == 45 && _minor_version <= 2) { 1328 cfs->guarantee_more(4, CHECK_(nullHandle)); 1329 max_stack = cfs->get_u1_fast(); 1330 max_locals = cfs->get_u1_fast(); 1331 code_length = cfs->get_u2_fast(); 1332 } else { 1333 cfs->guarantee_more(8, CHECK_(nullHandle)); 1334 max_stack = cfs->get_u2_fast(); 1335 max_locals = cfs->get_u2_fast(); 1336 code_length = cfs->get_u4_fast(); 1337 } 1338 if (_need_verify) { 1339 guarantee_property(args_size <= max_locals, 1340 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 1341 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 1342 "Invalid method Code length %u in class file %s", 1343 code_length, CHECK_(nullHandle)); 1344 } 1345 // Code pointer 1346 code_start = cfs->get_u1_buffer(); 1347 assert(code_start != NULL, "null code start"); 1348 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 1349 cfs->skip_u1_fast(code_length); 1350 1351 // Exception handler table 1352 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 1353 exception_table_length = cfs->get_u2_fast(); 1354 if (exception_table_length > 0) { 1355 exception_handlers = 1356 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle)); 1357 } 1358 1359 // Parse additional attributes in code attribute 1360 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 1361 u2 code_attributes_count = cfs->get_u2_fast(); 1362 1363 unsigned int calculated_attribute_length = 0; 1364 1365 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 1366 calculated_attribute_length = 1367 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 1368 } else { 1369 // max_stack, locals and length are smaller in pre-version 45.2 classes 1370 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 1371 } 1372 calculated_attribute_length += 1373 code_length + 1374 sizeof(exception_table_length) + 1375 sizeof(code_attributes_count) + 1376 exception_table_length * 1377 ( sizeof(u2) + // start_pc 1378 sizeof(u2) + // end_pc 1379 sizeof(u2) + // handler_pc 1380 sizeof(u2) ); // catch_type_index 1381 1382 while (code_attributes_count--) { 1383 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 1384 u2 code_attribute_name_index = cfs->get_u2_fast(); 1385 u4 code_attribute_length = cfs->get_u4_fast(); 1386 calculated_attribute_length += code_attribute_length + 1387 sizeof(code_attribute_name_index) + 1388 sizeof(code_attribute_length); 1389 check_property(valid_cp_range(code_attribute_name_index, cp_size) && 1390 cp->tag_at(code_attribute_name_index).is_utf8(), 1391 "Invalid code attribute name index %u in class file %s", 1392 code_attribute_name_index, 1393 CHECK_(nullHandle)); 1394 if (LoadLineNumberTables && 1395 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 1396 // Parse and compress line number table 1397 parse_linenumber_table(code_attribute_length, code_length, 1398 &linenumber_table, CHECK_(nullHandle)); 1399 1400 } else if (LoadLocalVariableTables && 1401 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 1402 // Parse local variable table 1403 if (!lvt_allocated) { 1404 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1405 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1406 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1407 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1408 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1409 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1410 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1411 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1412 lvt_allocated = true; 1413 } 1414 if (lvt_cnt == max_lvt_cnt) { 1415 max_lvt_cnt <<= 1; 1416 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 1417 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 1418 } 1419 localvariable_table_start[lvt_cnt] = 1420 parse_localvariable_table(code_length, 1421 max_locals, 1422 code_attribute_length, 1423 cp, 1424 &localvariable_table_length[lvt_cnt], 1425 false, // is not LVTT 1426 CHECK_(nullHandle)); 1427 total_lvt_length += localvariable_table_length[lvt_cnt]; 1428 lvt_cnt++; 1429 } else if (LoadLocalVariableTypeTables && 1430 _major_version >= JAVA_1_5_VERSION && 1431 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 1432 if (!lvt_allocated) { 1433 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1434 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1435 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1436 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1437 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1438 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1439 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1440 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1441 lvt_allocated = true; 1442 } 1443 // Parse local variable type table 1444 if (lvtt_cnt == max_lvtt_cnt) { 1445 max_lvtt_cnt <<= 1; 1446 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 1447 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 1448 } 1449 localvariable_type_table_start[lvtt_cnt] = 1450 parse_localvariable_table(code_length, 1451 max_locals, 1452 code_attribute_length, 1453 cp, 1454 &localvariable_type_table_length[lvtt_cnt], 1455 true, // is LVTT 1456 CHECK_(nullHandle)); 1457 lvtt_cnt++; 1458 } else if (UseSplitVerifier && 1459 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 1460 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 1461 // Stack map is only needed by the new verifier in JDK1.5. 1462 if (parsed_stackmap_attribute) { 1463 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 1464 } 1465 typeArrayOop sm = 1466 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 1467 stackmap_data = typeArrayHandle(THREAD, sm); 1468 parsed_stackmap_attribute = true; 1469 } else { 1470 // Skip unknown attributes 1471 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 1472 } 1473 } 1474 // check method attribute length 1475 if (_need_verify) { 1476 guarantee_property(method_attribute_length == calculated_attribute_length, 1477 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 1478 } 1479 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 1480 // Parse Exceptions attribute 1481 if (parsed_checked_exceptions_attribute) { 1482 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 1483 } 1484 parsed_checked_exceptions_attribute = true; 1485 checked_exceptions_start = 1486 parse_checked_exceptions(&checked_exceptions_length, 1487 method_attribute_length, 1488 cp, CHECK_(nullHandle)); 1489 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 1490 if (method_attribute_length != 0) { 1491 classfile_parse_error( 1492 "Invalid Synthetic method attribute length %u in class file %s", 1493 method_attribute_length, CHECK_(nullHandle)); 1494 } 1495 // Should we check that there hasn't already been a synthetic attribute? 1496 access_flags.set_is_synthetic(); 1497 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1498 if (method_attribute_length != 0) { 1499 classfile_parse_error( 1500 "Invalid Deprecated method attribute length %u in class file %s", 1501 method_attribute_length, CHECK_(nullHandle)); 1502 } 1503 } else if (_major_version >= JAVA_1_5_VERSION) { 1504 if (method_attribute_name == vmSymbols::tag_signature()) { 1505 if (method_attribute_length != 2) { 1506 classfile_parse_error( 1507 "Invalid Signature attribute length %u in class file %s", 1508 method_attribute_length, CHECK_(nullHandle)); 1509 } 1510 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 1511 generic_signature_index = cfs->get_u2_fast(); 1512 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1513 runtime_visible_annotations_length = method_attribute_length; 1514 runtime_visible_annotations = cfs->get_u1_buffer(); 1515 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1516 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 1517 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1518 runtime_invisible_annotations_length = method_attribute_length; 1519 runtime_invisible_annotations = cfs->get_u1_buffer(); 1520 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1521 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 1522 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 1523 runtime_visible_parameter_annotations_length = method_attribute_length; 1524 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 1525 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 1526 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 1527 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 1528 runtime_invisible_parameter_annotations_length = method_attribute_length; 1529 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 1530 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 1531 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 1532 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 1533 annotation_default_length = method_attribute_length; 1534 annotation_default = cfs->get_u1_buffer(); 1535 assert(annotation_default != NULL, "null annotation default"); 1536 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 1537 } else { 1538 // Skip unknown attributes 1539 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1540 } 1541 } else { 1542 // Skip unknown attributes 1543 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1544 } 1545 } 1546 1547 if (linenumber_table != NULL) { 1548 linenumber_table->write_terminator(); 1549 linenumber_table_length = linenumber_table->position(); 1550 } 1551 1552 // Make sure there's at least one Code attribute in non-native/non-abstract method 1553 if (_need_verify) { 1554 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 1555 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 1556 } 1557 1558 // All sizing information for a methodOop is finally available, now create it 1559 methodOop m_oop = oopFactory::new_method( 1560 code_length, access_flags, linenumber_table_length, 1561 total_lvt_length, checked_exceptions_length, CHECK_(nullHandle)); 1562 methodHandle m (THREAD, m_oop); 1563 1564 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize); 1565 1566 // Fill in information from fixed part (access_flags already set) 1567 m->set_constants(cp()); 1568 m->set_name_index(name_index); 1569 m->set_signature_index(signature_index); 1570 m->set_generic_signature_index(generic_signature_index); 1571#ifdef CC_INTERP 1572 // hmm is there a gc issue here?? 1573 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 1574 m->set_result_index(rtf.type()); 1575#endif 1576 1577 if (args_size >= 0) { 1578 m->set_size_of_parameters(args_size); 1579 } else { 1580 m->compute_size_of_parameters(THREAD); 1581 } 1582#ifdef ASSERT 1583 if (args_size >= 0) { 1584 m->compute_size_of_parameters(THREAD); 1585 assert(args_size == m->size_of_parameters(), ""); 1586 } 1587#endif 1588 1589 // Fill in code attribute information 1590 m->set_max_stack(max_stack); 1591 m->set_max_locals(max_locals); 1592 m->constMethod()->set_stackmap_data(stackmap_data()); 1593 1594 /** 1595 * The exception_table field is the flag used to indicate 1596 * that the methodOop and it's associated constMethodOop are partially 1597 * initialized and thus are exempt from pre/post GC verification. Once 1598 * the field is set, the oops are considered fully initialized so make 1599 * sure that the oops can pass verification when this field is set. 1600 */ 1601 m->set_exception_table(exception_handlers()); 1602 1603 // Copy byte codes 1604 if (code_length > 0) { 1605 memcpy(m->code_base(), code_start, code_length); 1606 } 1607 1608 // Copy line number table 1609 if (linenumber_table != NULL) { 1610 memcpy(m->compressed_linenumber_table(), 1611 linenumber_table->buffer(), linenumber_table_length); 1612 } 1613 1614 // Copy checked exceptions 1615 if (checked_exceptions_length > 0) { 1616 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 1617 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 1618 } 1619 1620 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1621 * 1622 * Rules for LVT's and LVTT's are: 1623 * - There can be any number of LVT's and LVTT's. 1624 * - If there are n LVT's, it is the same as if there was just 1625 * one LVT containing all the entries from the n LVT's. 1626 * - There may be no more than one LVT entry per local variable. 1627 * Two LVT entries are 'equal' if these fields are the same: 1628 * start_pc, length, name, slot 1629 * - There may be no more than one LVTT entry per each LVT entry. 1630 * Each LVTT entry has to match some LVT entry. 1631 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1632 */ 1633 if (total_lvt_length > 0) { 1634 int tbl_no, idx; 1635 1636 promoted_flags->set_has_localvariable_table(); 1637 1638 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1639 initialize_hashtable(lvt_Hash); 1640 1641 // To fill LocalVariableTable in 1642 Classfile_LVT_Element* cf_lvt; 1643 LocalVariableTableElement* lvt = m->localvariable_table_start(); 1644 1645 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1646 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1647 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1648 copy_lvt_element(&cf_lvt[idx], lvt); 1649 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1650 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1651 && _need_verify 1652 && _major_version >= JAVA_1_5_VERSION ) { 1653 clear_hashtable(lvt_Hash); 1654 classfile_parse_error("Duplicated LocalVariableTable attribute " 1655 "entry for '%s' in class file %s", 1656 cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1657 CHECK_(nullHandle)); 1658 } 1659 } 1660 } 1661 1662 // To merge LocalVariableTable and LocalVariableTypeTable 1663 Classfile_LVT_Element* cf_lvtt; 1664 LocalVariableTableElement lvtt_elem; 1665 1666 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1667 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1668 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1669 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1670 int index = hash(&lvtt_elem); 1671 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1672 if (entry == NULL) { 1673 if (_need_verify) { 1674 clear_hashtable(lvt_Hash); 1675 classfile_parse_error("LVTT entry for '%s' in class file %s " 1676 "does not match any LVT entry", 1677 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1678 CHECK_(nullHandle)); 1679 } 1680 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1681 clear_hashtable(lvt_Hash); 1682 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1683 "entry for '%s' in class file %s", 1684 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1685 CHECK_(nullHandle)); 1686 } else { 1687 // to add generic signatures into LocalVariableTable 1688 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1689 } 1690 } 1691 } 1692 clear_hashtable(lvt_Hash); 1693 } 1694 1695 *method_annotations = assemble_annotations(runtime_visible_annotations, 1696 runtime_visible_annotations_length, 1697 runtime_invisible_annotations, 1698 runtime_invisible_annotations_length, 1699 CHECK_(nullHandle)); 1700 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations, 1701 runtime_visible_parameter_annotations_length, 1702 runtime_invisible_parameter_annotations, 1703 runtime_invisible_parameter_annotations_length, 1704 CHECK_(nullHandle)); 1705 *method_default_annotations = assemble_annotations(annotation_default, 1706 annotation_default_length, 1707 NULL, 1708 0, 1709 CHECK_(nullHandle)); 1710 1711 if (name() == vmSymbols::finalize_method_name() && 1712 signature() == vmSymbols::void_method_signature()) { 1713 if (m->is_empty_method()) { 1714 _has_empty_finalizer = true; 1715 } else { 1716 _has_finalizer = true; 1717 } 1718 } 1719 if (name() == vmSymbols::object_initializer_name() && 1720 signature() == vmSymbols::void_method_signature() && 1721 m->is_vanilla_constructor()) { 1722 _has_vanilla_constructor = true; 1723 } 1724 1725 return m; 1726} 1727 1728 1729// The promoted_flags parameter is used to pass relevant access_flags 1730// from the methods back up to the containing klass. These flag values 1731// are added to klass's access_flags. 1732 1733objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface, 1734 AccessFlags* promoted_flags, 1735 bool* has_final_method, 1736 objArrayOop* methods_annotations_oop, 1737 objArrayOop* methods_parameter_annotations_oop, 1738 objArrayOop* methods_default_annotations_oop, 1739 TRAPS) { 1740 ClassFileStream* cfs = stream(); 1741 objArrayHandle nullHandle; 1742 typeArrayHandle method_annotations; 1743 typeArrayHandle method_parameter_annotations; 1744 typeArrayHandle method_default_annotations; 1745 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 1746 u2 length = cfs->get_u2_fast(); 1747 if (length == 0) { 1748 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 1749 } else { 1750 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1751 objArrayHandle methods(THREAD, m); 1752 HandleMark hm(THREAD); 1753 objArrayHandle methods_annotations; 1754 objArrayHandle methods_parameter_annotations; 1755 objArrayHandle methods_default_annotations; 1756 for (int index = 0; index < length; index++) { 1757 methodHandle method = parse_method(cp, is_interface, 1758 promoted_flags, 1759 &method_annotations, 1760 &method_parameter_annotations, 1761 &method_default_annotations, 1762 CHECK_(nullHandle)); 1763 if (method->is_final()) { 1764 *has_final_method = true; 1765 } 1766 methods->obj_at_put(index, method()); 1767 if (method_annotations.not_null()) { 1768 if (methods_annotations.is_null()) { 1769 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1770 methods_annotations = objArrayHandle(THREAD, md); 1771 } 1772 methods_annotations->obj_at_put(index, method_annotations()); 1773 } 1774 if (method_parameter_annotations.not_null()) { 1775 if (methods_parameter_annotations.is_null()) { 1776 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1777 methods_parameter_annotations = objArrayHandle(THREAD, md); 1778 } 1779 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations()); 1780 } 1781 if (method_default_annotations.not_null()) { 1782 if (methods_default_annotations.is_null()) { 1783 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1784 methods_default_annotations = objArrayHandle(THREAD, md); 1785 } 1786 methods_default_annotations->obj_at_put(index, method_default_annotations()); 1787 } 1788 } 1789 if (_need_verify && length > 1) { 1790 // Check duplicated methods 1791 ResourceMark rm(THREAD); 1792 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1793 THREAD, NameSigHash*, HASH_ROW_SIZE); 1794 initialize_hashtable(names_and_sigs); 1795 bool dup = false; 1796 { 1797 debug_only(No_Safepoint_Verifier nsv;) 1798 for (int i = 0; i < length; i++) { 1799 methodOop m = (methodOop)methods->obj_at(i); 1800 // If no duplicates, add name/signature in hashtable names_and_sigs. 1801 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 1802 dup = true; 1803 break; 1804 } 1805 } 1806 } 1807 if (dup) { 1808 classfile_parse_error("Duplicate method name&signature in class file %s", 1809 CHECK_(nullHandle)); 1810 } 1811 } 1812 1813 *methods_annotations_oop = methods_annotations(); 1814 *methods_parameter_annotations_oop = methods_parameter_annotations(); 1815 *methods_default_annotations_oop = methods_default_annotations(); 1816 1817 return methods; 1818 } 1819} 1820 1821 1822typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods, 1823 objArrayHandle methods_annotations, 1824 objArrayHandle methods_parameter_annotations, 1825 objArrayHandle methods_default_annotations, 1826 TRAPS) { 1827 typeArrayHandle nullHandle; 1828 int length = methods()->length(); 1829 // If JVMTI original method ordering is enabled we have to 1830 // remember the original class file ordering. 1831 // We temporarily use the vtable_index field in the methodOop to store the 1832 // class file index, so we can read in after calling qsort. 1833 if (JvmtiExport::can_maintain_original_method_order()) { 1834 for (int index = 0; index < length; index++) { 1835 methodOop m = methodOop(methods->obj_at(index)); 1836 assert(!m->valid_vtable_index(), "vtable index should not be set"); 1837 m->set_vtable_index(index); 1838 } 1839 } 1840 // Sort method array by ascending method name (for faster lookups & vtable construction) 1841 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare 1842 methodOopDesc::sort_methods(methods(), 1843 methods_annotations(), 1844 methods_parameter_annotations(), 1845 methods_default_annotations()); 1846 1847 // If JVMTI original method ordering is enabled construct int array remembering the original ordering 1848 if (JvmtiExport::can_maintain_original_method_order()) { 1849 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle)); 1850 typeArrayHandle method_ordering(THREAD, new_ordering); 1851 for (int index = 0; index < length; index++) { 1852 methodOop m = methodOop(methods->obj_at(index)); 1853 int old_index = m->vtable_index(); 1854 assert(old_index >= 0 && old_index < length, "invalid method index"); 1855 method_ordering->int_at_put(index, old_index); 1856 m->set_vtable_index(methodOopDesc::invalid_vtable_index); 1857 } 1858 return method_ordering; 1859 } else { 1860 return typeArrayHandle(THREAD, Universe::the_empty_int_array()); 1861 } 1862} 1863 1864 1865void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 1866 ClassFileStream* cfs = stream(); 1867 cfs->guarantee_more(2, CHECK); // sourcefile_index 1868 u2 sourcefile_index = cfs->get_u2_fast(); 1869 check_property( 1870 valid_cp_range(sourcefile_index, cp->length()) && 1871 cp->tag_at(sourcefile_index).is_utf8(), 1872 "Invalid SourceFile attribute at constant pool index %u in class file %s", 1873 sourcefile_index, CHECK); 1874 k->set_source_file_name(cp->symbol_at(sourcefile_index)); 1875} 1876 1877 1878 1879void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp, 1880 instanceKlassHandle k, 1881 int length, TRAPS) { 1882 ClassFileStream* cfs = stream(); 1883 u1* sde_buffer = cfs->get_u1_buffer(); 1884 assert(sde_buffer != NULL, "null sde buffer"); 1885 1886 // Don't bother storing it if there is no way to retrieve it 1887 if (JvmtiExport::can_get_source_debug_extension()) { 1888 // Optimistically assume that only 1 byte UTF format is used 1889 // (common case) 1890 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer, 1891 length, CHECK); 1892 k->set_source_debug_extension(sde_symbol); 1893 } 1894 // Got utf8 string, set stream position forward 1895 cfs->skip_u1(length, CHECK); 1896} 1897 1898 1899// Inner classes can be static, private or protected (classic VM does this) 1900#define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 1901 1902// Return number of classes in the inner classes attribute table 1903u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 1904 ClassFileStream* cfs = stream(); 1905 cfs->guarantee_more(2, CHECK_0); // length 1906 u2 length = cfs->get_u2_fast(); 1907 1908 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags] 1909 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0); 1910 typeArrayHandle inner_classes(THREAD, ic); 1911 int index = 0; 1912 int cp_size = cp->length(); 1913 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 1914 for (int n = 0; n < length; n++) { 1915 // Inner class index 1916 u2 inner_class_info_index = cfs->get_u2_fast(); 1917 check_property( 1918 inner_class_info_index == 0 || 1919 (valid_cp_range(inner_class_info_index, cp_size) && 1920 cp->tag_at(inner_class_info_index).is_klass_reference()), 1921 "inner_class_info_index %u has bad constant type in class file %s", 1922 inner_class_info_index, CHECK_0); 1923 // Outer class index 1924 u2 outer_class_info_index = cfs->get_u2_fast(); 1925 check_property( 1926 outer_class_info_index == 0 || 1927 (valid_cp_range(outer_class_info_index, cp_size) && 1928 cp->tag_at(outer_class_info_index).is_klass_reference()), 1929 "outer_class_info_index %u has bad constant type in class file %s", 1930 outer_class_info_index, CHECK_0); 1931 // Inner class name 1932 u2 inner_name_index = cfs->get_u2_fast(); 1933 check_property( 1934 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) && 1935 cp->tag_at(inner_name_index).is_utf8()), 1936 "inner_name_index %u has bad constant type in class file %s", 1937 inner_name_index, CHECK_0); 1938 if (_need_verify) { 1939 guarantee_property(inner_class_info_index != outer_class_info_index, 1940 "Class is both outer and inner class in class file %s", CHECK_0); 1941 } 1942 // Access flags 1943 AccessFlags inner_access_flags; 1944 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 1945 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 1946 // Set abstract bit for old class files for backward compatibility 1947 flags |= JVM_ACC_ABSTRACT; 1948 } 1949 verify_legal_class_modifiers(flags, CHECK_0); 1950 inner_access_flags.set_flags(flags); 1951 1952 inner_classes->short_at_put(index++, inner_class_info_index); 1953 inner_classes->short_at_put(index++, outer_class_info_index); 1954 inner_classes->short_at_put(index++, inner_name_index); 1955 inner_classes->short_at_put(index++, inner_access_flags.as_short()); 1956 } 1957 1958 // 4347400: make sure there's no duplicate entry in the classes array 1959 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 1960 for(int i = 0; i < inner_classes->length(); i += 4) { 1961 for(int j = i + 4; j < inner_classes->length(); j += 4) { 1962 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) || 1963 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) || 1964 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) || 1965 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)), 1966 "Duplicate entry in InnerClasses in class file %s", 1967 CHECK_0); 1968 } 1969 } 1970 } 1971 1972 // Update instanceKlass with inner class info. 1973 k->set_inner_classes(inner_classes()); 1974 return length; 1975} 1976 1977void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 1978 k->set_is_synthetic(); 1979} 1980 1981void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 1982 ClassFileStream* cfs = stream(); 1983 u2 signature_index = cfs->get_u2(CHECK); 1984 check_property( 1985 valid_cp_range(signature_index, cp->length()) && 1986 cp->tag_at(signature_index).is_utf8(), 1987 "Invalid constant pool index %u in Signature attribute in class file %s", 1988 signature_index, CHECK); 1989 k->set_generic_signature(cp->symbol_at(signature_index)); 1990} 1991 1992void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 1993 ClassFileStream* cfs = stream(); 1994 // Set inner classes attribute to default sentinel 1995 k->set_inner_classes(Universe::the_empty_short_array()); 1996 cfs->guarantee_more(2, CHECK); // attributes_count 1997 u2 attributes_count = cfs->get_u2_fast(); 1998 bool parsed_sourcefile_attribute = false; 1999 bool parsed_innerclasses_attribute = false; 2000 bool parsed_enclosingmethod_attribute = false; 2001 u1* runtime_visible_annotations = NULL; 2002 int runtime_visible_annotations_length = 0; 2003 u1* runtime_invisible_annotations = NULL; 2004 int runtime_invisible_annotations_length = 0; 2005 // Iterate over attributes 2006 while (attributes_count--) { 2007 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2008 u2 attribute_name_index = cfs->get_u2_fast(); 2009 u4 attribute_length = cfs->get_u4_fast(); 2010 check_property( 2011 valid_cp_range(attribute_name_index, cp->length()) && 2012 cp->tag_at(attribute_name_index).is_utf8(), 2013 "Attribute name has bad constant pool index %u in class file %s", 2014 attribute_name_index, CHECK); 2015 symbolOop tag = cp->symbol_at(attribute_name_index); 2016 if (tag == vmSymbols::tag_source_file()) { 2017 // Check for SourceFile tag 2018 if (_need_verify) { 2019 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2020 } 2021 if (parsed_sourcefile_attribute) { 2022 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2023 } else { 2024 parsed_sourcefile_attribute = true; 2025 } 2026 parse_classfile_sourcefile_attribute(cp, k, CHECK); 2027 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2028 // Check for SourceDebugExtension tag 2029 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK); 2030 } else if (tag == vmSymbols::tag_inner_classes()) { 2031 // Check for InnerClasses tag 2032 if (parsed_innerclasses_attribute) { 2033 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2034 } else { 2035 parsed_innerclasses_attribute = true; 2036 } 2037 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK); 2038 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2039 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2040 "Wrong InnerClasses attribute length in class file %s", CHECK); 2041 } 2042 } else if (tag == vmSymbols::tag_synthetic()) { 2043 // Check for Synthetic tag 2044 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2045 if (attribute_length != 0) { 2046 classfile_parse_error( 2047 "Invalid Synthetic classfile attribute length %u in class file %s", 2048 attribute_length, CHECK); 2049 } 2050 parse_classfile_synthetic_attribute(cp, k, CHECK); 2051 } else if (tag == vmSymbols::tag_deprecated()) { 2052 // Check for Deprecatd tag - 4276120 2053 if (attribute_length != 0) { 2054 classfile_parse_error( 2055 "Invalid Deprecated classfile attribute length %u in class file %s", 2056 attribute_length, CHECK); 2057 } 2058 } else if (_major_version >= JAVA_1_5_VERSION) { 2059 if (tag == vmSymbols::tag_signature()) { 2060 if (attribute_length != 2) { 2061 classfile_parse_error( 2062 "Wrong Signature attribute length %u in class file %s", 2063 attribute_length, CHECK); 2064 } 2065 parse_classfile_signature_attribute(cp, k, CHECK); 2066 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2067 runtime_visible_annotations_length = attribute_length; 2068 runtime_visible_annotations = cfs->get_u1_buffer(); 2069 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2070 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2071 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2072 runtime_invisible_annotations_length = attribute_length; 2073 runtime_invisible_annotations = cfs->get_u1_buffer(); 2074 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2075 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2076 } else if (tag == vmSymbols::tag_enclosing_method()) { 2077 if (parsed_enclosingmethod_attribute) { 2078 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2079 } else { 2080 parsed_enclosingmethod_attribute = true; 2081 } 2082 cfs->guarantee_more(4, CHECK); // class_index, method_index 2083 u2 class_index = cfs->get_u2_fast(); 2084 u2 method_index = cfs->get_u2_fast(); 2085 if (class_index == 0) { 2086 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2087 } 2088 // Validate the constant pool indices and types 2089 if (!cp->is_within_bounds(class_index) || 2090 !cp->tag_at(class_index).is_klass_reference()) { 2091 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2092 } 2093 if (method_index != 0 && 2094 (!cp->is_within_bounds(method_index) || 2095 !cp->tag_at(method_index).is_name_and_type())) { 2096 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2097 } 2098 k->set_enclosing_method_indices(class_index, method_index); 2099 } else { 2100 // Unknown attribute 2101 cfs->skip_u1(attribute_length, CHECK); 2102 } 2103 } else { 2104 // Unknown attribute 2105 cfs->skip_u1(attribute_length, CHECK); 2106 } 2107 } 2108 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations, 2109 runtime_visible_annotations_length, 2110 runtime_invisible_annotations, 2111 runtime_invisible_annotations_length, 2112 CHECK); 2113 k->set_class_annotations(annotations()); 2114} 2115 2116 2117typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 2118 int runtime_visible_annotations_length, 2119 u1* runtime_invisible_annotations, 2120 int runtime_invisible_annotations_length, TRAPS) { 2121 typeArrayHandle annotations; 2122 if (runtime_visible_annotations != NULL || 2123 runtime_invisible_annotations != NULL) { 2124 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length + 2125 runtime_invisible_annotations_length, CHECK_(annotations)); 2126 annotations = typeArrayHandle(THREAD, anno); 2127 if (runtime_visible_annotations != NULL) { 2128 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length); 2129 } 2130 if (runtime_invisible_annotations != NULL) { 2131 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length); 2132 } 2133 } 2134 return annotations; 2135} 2136 2137 2138static void initialize_static_field(fieldDescriptor* fd, TRAPS) { 2139 KlassHandle h_k (THREAD, fd->field_holder()); 2140 assert(h_k.not_null() && fd->is_static(), "just checking"); 2141 if (fd->has_initial_value()) { 2142 BasicType t = fd->field_type(); 2143 switch (t) { 2144 case T_BYTE: 2145 h_k()->byte_field_put(fd->offset(), fd->int_initial_value()); 2146 break; 2147 case T_BOOLEAN: 2148 h_k()->bool_field_put(fd->offset(), fd->int_initial_value()); 2149 break; 2150 case T_CHAR: 2151 h_k()->char_field_put(fd->offset(), fd->int_initial_value()); 2152 break; 2153 case T_SHORT: 2154 h_k()->short_field_put(fd->offset(), fd->int_initial_value()); 2155 break; 2156 case T_INT: 2157 h_k()->int_field_put(fd->offset(), fd->int_initial_value()); 2158 break; 2159 case T_FLOAT: 2160 h_k()->float_field_put(fd->offset(), fd->float_initial_value()); 2161 break; 2162 case T_DOUBLE: 2163 h_k()->double_field_put(fd->offset(), fd->double_initial_value()); 2164 break; 2165 case T_LONG: 2166 h_k()->long_field_put(fd->offset(), fd->long_initial_value()); 2167 break; 2168 case T_OBJECT: 2169 { 2170 #ifdef ASSERT 2171 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK); 2172 assert(fd->signature() == sym, "just checking"); 2173 #endif 2174 oop string = fd->string_initial_value(CHECK); 2175 h_k()->obj_field_put(fd->offset(), string); 2176 } 2177 break; 2178 default: 2179 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 2180 "Illegal ConstantValue attribute in class file"); 2181 } 2182 } 2183} 2184 2185 2186void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr, 2187 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) { 2188 // This code is for compatibility with earlier jdk's that do not 2189 // have the "discovered" field in java.lang.ref.Reference. For 1.5 2190 // the check for the "discovered" field should issue a warning if 2191 // the field is not found. For 1.6 this code should be issue a 2192 // fatal error if the "discovered" field is not found. 2193 // 2194 // Increment fac.nonstatic_oop_count so that the start of the 2195 // next type of non-static oops leaves room for the fake oop. 2196 // Do not increment next_nonstatic_oop_offset so that the 2197 // fake oop is place after the java.lang.ref.Reference oop 2198 // fields. 2199 // 2200 // Check the fields in java.lang.ref.Reference for the "discovered" 2201 // field. If it is not present, artifically create a field for it. 2202 // This allows this VM to run on early JDK where the field is not 2203 // present. 2204 2205 // 2206 // Increment fac.nonstatic_oop_count so that the start of the 2207 // next type of non-static oops leaves room for the fake oop. 2208 // Do not increment next_nonstatic_oop_offset so that the 2209 // fake oop is place after the java.lang.ref.Reference oop 2210 // fields. 2211 // 2212 // Check the fields in java.lang.ref.Reference for the "discovered" 2213 // field. If it is not present, artifically create a field for it. 2214 // This allows this VM to run on early JDK where the field is not 2215 // present. 2216 int reference_sig_index = 0; 2217 int reference_name_index = 0; 2218 int reference_index = 0; 2219 int extra = java_lang_ref_Reference::number_of_fake_oop_fields; 2220 const int n = (*fields_ptr)()->length(); 2221 for (int i = 0; i < n; i += instanceKlass::next_offset ) { 2222 int name_index = 2223 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset); 2224 int sig_index = 2225 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset); 2226 symbolOop f_name = cp->symbol_at(name_index); 2227 symbolOop f_sig = cp->symbol_at(sig_index); 2228 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) { 2229 // Save the index for reference signature for later use. 2230 // The fake discovered field does not entries in the 2231 // constant pool so the index for its signature cannot 2232 // be extracted from the constant pool. It will need 2233 // later, however. It's signature is vmSymbols::reference_signature() 2234 // so same an index for that signature. 2235 reference_sig_index = sig_index; 2236 reference_name_index = name_index; 2237 reference_index = i; 2238 } 2239 if (f_name == vmSymbols::reference_discovered_name() && 2240 f_sig == vmSymbols::reference_signature()) { 2241 // The values below are fake but will force extra 2242 // non-static oop fields and a corresponding non-static 2243 // oop map block to be allocated. 2244 extra = 0; 2245 break; 2246 } 2247 } 2248 if (extra != 0) { 2249 fac_ptr->nonstatic_oop_count += extra; 2250 // Add the additional entry to "fields" so that the klass 2251 // contains the "discoverd" field and the field will be initialized 2252 // in instances of the object. 2253 int fields_with_fix_length = (*fields_ptr)()->length() + 2254 instanceKlass::next_offset; 2255 typeArrayOop ff = oopFactory::new_permanent_shortArray( 2256 fields_with_fix_length, CHECK); 2257 typeArrayHandle fields_with_fix(THREAD, ff); 2258 2259 // Take everything from the original but the length. 2260 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) { 2261 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx)); 2262 } 2263 2264 // Add the fake field at the end. 2265 int i = (*fields_ptr)->length(); 2266 // There is no name index for the fake "discovered" field nor 2267 // signature but a signature is needed so that the field will 2268 // be properly initialized. Use one found for 2269 // one of the other reference fields. Be sure the index for the 2270 // name is 0. In fieldDescriptor::initialize() the index of the 2271 // name is checked. That check is by passed for the last nonstatic 2272 // oop field in a java.lang.ref.Reference which is assumed to be 2273 // this artificial "discovered" field. An assertion checks that 2274 // the name index is 0. 2275 assert(reference_index != 0, "Missing signature for reference"); 2276 2277 int j; 2278 for (j = 0; j < instanceKlass::next_offset; j++) { 2279 fields_with_fix->ushort_at_put(i + j, 2280 (*fields_ptr)->ushort_at(reference_index +j)); 2281 } 2282 // Clear the public access flag and set the private access flag. 2283 short flags; 2284 flags = 2285 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset); 2286 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set"); 2287 flags = flags & (~JVM_ACC_PUBLIC); 2288 flags = flags | JVM_ACC_PRIVATE; 2289 AccessFlags access_flags; 2290 access_flags.set_flags(flags); 2291 assert(!access_flags.is_public(), "Failed to clear public flag"); 2292 assert(access_flags.is_private(), "Failed to set private flag"); 2293 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset, 2294 flags); 2295 2296 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset) 2297 == reference_name_index, "The fake reference name is incorrect"); 2298 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset) 2299 == reference_sig_index, "The fake reference signature is incorrect"); 2300 // The type of the field is stored in the low_offset entry during 2301 // parsing. 2302 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) == 2303 NONSTATIC_OOP, "The fake reference type is incorrect"); 2304 2305 // "fields" is allocated in the permanent generation. Disgard 2306 // it and let it be collected. 2307 (*fields_ptr) = fields_with_fix; 2308 } 2309 return; 2310} 2311 2312 2313void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr, 2314 FieldAllocationCount *fac_ptr, TRAPS) { 2315 // Add fake fields for java.lang.Class instances 2316 // 2317 // This is not particularly nice. We should consider adding a 2318 // private transient object field at the Java level to 2319 // java.lang.Class. Alternatively we could add a subclass of 2320 // instanceKlass which provides an accessor and size computer for 2321 // this field, but that appears to be more code than this hack. 2322 // 2323 // NOTE that we wedge these in at the beginning rather than the 2324 // end of the object because the Class layout changed between JDK 2325 // 1.3 and JDK 1.4 with the new reflection implementation; some 2326 // nonstatic oop fields were added at the Java level. The offsets 2327 // of these fake fields can't change between these two JDK 2328 // versions because when the offsets are computed at bootstrap 2329 // time we don't know yet which version of the JDK we're running in. 2330 2331 // The values below are fake but will force two non-static oop fields and 2332 // a corresponding non-static oop map block to be allocated. 2333 const int extra = java_lang_Class::number_of_fake_oop_fields; 2334 fac_ptr->nonstatic_oop_count += extra; 2335} 2336 2337 2338void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) { 2339 // Cause the extra fake fields in java.lang.Class to show up before 2340 // the Java fields for layout compatibility between 1.3 and 1.4 2341 // Incrementing next_nonstatic_oop_offset here advances the 2342 // location where the real java fields are placed. 2343 const int extra = java_lang_Class::number_of_fake_oop_fields; 2344 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize); 2345} 2346 2347 2348instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name, 2349 Handle class_loader, 2350 Handle protection_domain, 2351 symbolHandle& parsed_name, 2352 TRAPS) { 2353 // So that JVMTI can cache class file in the state before retransformable agents 2354 // have modified it 2355 unsigned char *cached_class_file_bytes = NULL; 2356 jint cached_class_file_length; 2357 2358 ClassFileStream* cfs = stream(); 2359 // Timing 2360 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time()); 2361 2362 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false; 2363 2364 if (JvmtiExport::should_post_class_file_load_hook()) { 2365 unsigned char* ptr = cfs->buffer(); 2366 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 2367 2368 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain, 2369 &ptr, &end_ptr, 2370 &cached_class_file_bytes, 2371 &cached_class_file_length); 2372 2373 if (ptr != cfs->buffer()) { 2374 // JVMTI agent has modified class file data. 2375 // Set new class file stream using JVMTI agent modified 2376 // class file data. 2377 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 2378 set_stream(cfs); 2379 } 2380 } 2381 2382 2383 instanceKlassHandle nullHandle; 2384 2385 // Figure out whether we can skip format checking (matching classic VM behavior) 2386 _need_verify = Verifier::should_verify_for(class_loader()); 2387 2388 // Set the verify flag in stream 2389 cfs->set_verify(_need_verify); 2390 2391 // Save the class file name for easier error message printing. 2392 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name(); 2393 2394 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 2395 // Magic value 2396 u4 magic = cfs->get_u4_fast(); 2397 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 2398 "Incompatible magic value %u in class file %s", 2399 magic, CHECK_(nullHandle)); 2400 2401 // Version numbers 2402 u2 minor_version = cfs->get_u2_fast(); 2403 u2 major_version = cfs->get_u2_fast(); 2404 2405 // Check version numbers - we check this even with verifier off 2406 if (!is_supported_version(major_version, minor_version)) { 2407 if (name.is_null()) { 2408 Exceptions::fthrow( 2409 THREAD_AND_LOCATION, 2410 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2411 "Unsupported major.minor version %u.%u", 2412 major_version, 2413 minor_version); 2414 } else { 2415 ResourceMark rm(THREAD); 2416 Exceptions::fthrow( 2417 THREAD_AND_LOCATION, 2418 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2419 "%s : Unsupported major.minor version %u.%u", 2420 name->as_C_string(), 2421 major_version, 2422 minor_version); 2423 } 2424 return nullHandle; 2425 } 2426 2427 _major_version = major_version; 2428 _minor_version = minor_version; 2429 2430 2431 // Check if verification needs to be relaxed for this class file 2432 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 2433 _relax_verify = Verifier::relax_verify_for(class_loader()); 2434 2435 // Constant pool 2436 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 2437 int cp_size = cp->length(); 2438 2439 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 2440 2441 // Access flags 2442 AccessFlags access_flags; 2443 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 2444 2445 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2446 // Set abstract bit for old class files for backward compatibility 2447 flags |= JVM_ACC_ABSTRACT; 2448 } 2449 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 2450 access_flags.set_flags(flags); 2451 2452 // This class and superclass 2453 instanceKlassHandle super_klass; 2454 u2 this_class_index = cfs->get_u2_fast(); 2455 check_property( 2456 valid_cp_range(this_class_index, cp_size) && 2457 cp->tag_at(this_class_index).is_unresolved_klass(), 2458 "Invalid this class index %u in constant pool in class file %s", 2459 this_class_index, CHECK_(nullHandle)); 2460 2461 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index)); 2462 assert(class_name.not_null(), "class_name can't be null"); 2463 2464 // It's important to set parsed_name *before* resolving the super class. 2465 // (it's used for cleanup by the caller if parsing fails) 2466 parsed_name = class_name; 2467 2468 // Update _class_name which could be null previously to be class_name 2469 _class_name = class_name; 2470 2471 // Don't need to check whether this class name is legal or not. 2472 // It has been checked when constant pool is parsed. 2473 // However, make sure it is not an array type. 2474 if (_need_verify) { 2475 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 2476 "Bad class name in class file %s", 2477 CHECK_(nullHandle)); 2478 } 2479 2480 klassOop preserve_this_klass; // for storing result across HandleMark 2481 2482 // release all handles when parsing is done 2483 { HandleMark hm(THREAD); 2484 2485 // Checks if name in class file matches requested name 2486 if (name.not_null() && class_name() != name()) { 2487 ResourceMark rm(THREAD); 2488 Exceptions::fthrow( 2489 THREAD_AND_LOCATION, 2490 vmSymbolHandles::java_lang_NoClassDefFoundError(), 2491 "%s (wrong name: %s)", 2492 name->as_C_string(), 2493 class_name->as_C_string() 2494 ); 2495 return nullHandle; 2496 } 2497 2498 if (TraceClassLoadingPreorder) { 2499 tty->print("[Loading %s", name()->as_klass_external_name()); 2500 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 2501 tty->print_cr("]"); 2502 } 2503 2504 u2 super_class_index = cfs->get_u2_fast(); 2505 if (super_class_index == 0) { 2506 check_property(class_name() == vmSymbols::java_lang_Object(), 2507 "Invalid superclass index %u in class file %s", 2508 super_class_index, 2509 CHECK_(nullHandle)); 2510 } else { 2511 check_property(valid_cp_range(super_class_index, cp_size) && 2512 cp->tag_at(super_class_index).is_unresolved_klass(), 2513 "Invalid superclass index %u in class file %s", 2514 super_class_index, 2515 CHECK_(nullHandle)); 2516 // The class name should be legal because it is checked when parsing constant pool. 2517 // However, make sure it is not an array type. 2518 if (_need_verify) { 2519 guarantee_property(cp->unresolved_klass_at(super_class_index)->byte_at(0) != JVM_SIGNATURE_ARRAY, 2520 "Bad superclass name in class file %s", CHECK_(nullHandle)); 2521 } 2522 } 2523 2524 // Interfaces 2525 u2 itfs_len = cfs->get_u2_fast(); 2526 objArrayHandle local_interfaces; 2527 if (itfs_len == 0) { 2528 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 2529 } else { 2530 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle)); 2531 } 2532 2533 // Fields (offsets are filled in later) 2534 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0}; 2535 objArrayHandle fields_annotations; 2536 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle)); 2537 // Methods 2538 bool has_final_method = false; 2539 AccessFlags promoted_flags; 2540 promoted_flags.set_flags(0); 2541 // These need to be oop pointers because they are allocated lazily 2542 // inside parse_methods inside a nested HandleMark 2543 objArrayOop methods_annotations_oop = NULL; 2544 objArrayOop methods_parameter_annotations_oop = NULL; 2545 objArrayOop methods_default_annotations_oop = NULL; 2546 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(), 2547 &promoted_flags, 2548 &has_final_method, 2549 &methods_annotations_oop, 2550 &methods_parameter_annotations_oop, 2551 &methods_default_annotations_oop, 2552 CHECK_(nullHandle)); 2553 2554 objArrayHandle methods_annotations(THREAD, methods_annotations_oop); 2555 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop); 2556 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop); 2557 2558 // We check super class after class file is parsed and format is checked 2559 if (super_class_index > 0) { 2560 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index)); 2561 if (access_flags.is_interface()) { 2562 // Before attempting to resolve the superclass, check for class format 2563 // errors not checked yet. 2564 guarantee_property(sk() == vmSymbols::java_lang_Object(), 2565 "Interfaces must have java.lang.Object as superclass in class file %s", 2566 CHECK_(nullHandle)); 2567 } 2568 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 2569 sk, 2570 class_loader, 2571 protection_domain, 2572 true, 2573 CHECK_(nullHandle)); 2574 KlassHandle kh (THREAD, k); 2575 super_klass = instanceKlassHandle(THREAD, kh()); 2576 if (super_klass->is_interface()) { 2577 ResourceMark rm(THREAD); 2578 Exceptions::fthrow( 2579 THREAD_AND_LOCATION, 2580 vmSymbolHandles::java_lang_IncompatibleClassChangeError(), 2581 "class %s has interface %s as super class", 2582 class_name->as_klass_external_name(), 2583 super_klass->external_name() 2584 ); 2585 return nullHandle; 2586 } 2587 // Make sure super class is not final 2588 if (super_klass->is_final()) { 2589 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 2590 } 2591 } 2592 2593 // Compute the transitive list of all unique interfaces implemented by this class 2594 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 2595 2596 // sort methods 2597 typeArrayHandle method_ordering = sort_methods(methods, 2598 methods_annotations, 2599 methods_parameter_annotations, 2600 methods_default_annotations, 2601 CHECK_(nullHandle)); 2602 2603 // promote flags from parse_methods() to the klass' flags 2604 access_flags.add_promoted_flags(promoted_flags.as_int()); 2605 2606 // Size of Java vtable (in words) 2607 int vtable_size = 0; 2608 int itable_size = 0; 2609 int num_miranda_methods = 0; 2610 2611 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size, 2612 num_miranda_methods, 2613 super_klass(), 2614 methods(), 2615 access_flags, 2616 class_loader(), 2617 class_name(), 2618 local_interfaces()); 2619 2620 // Size of Java itable (in words) 2621 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces); 2622 2623 // Field size and offset computation 2624 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); 2625#ifndef PRODUCT 2626 int orig_nonstatic_field_size = 0; 2627#endif 2628 int static_field_size = 0; 2629 int next_static_oop_offset; 2630 int next_static_double_offset; 2631 int next_static_word_offset; 2632 int next_static_short_offset; 2633 int next_static_byte_offset; 2634 int next_static_type_offset; 2635 int next_nonstatic_oop_offset; 2636 int next_nonstatic_double_offset; 2637 int next_nonstatic_word_offset; 2638 int next_nonstatic_short_offset; 2639 int next_nonstatic_byte_offset; 2640 int next_nonstatic_type_offset; 2641 int first_nonstatic_oop_offset; 2642 int first_nonstatic_field_offset; 2643 int next_nonstatic_field_offset; 2644 2645 // Calculate the starting byte offsets 2646 next_static_oop_offset = (instanceKlass::header_size() + 2647 align_object_offset(vtable_size) + 2648 align_object_offset(itable_size)) * wordSize; 2649 next_static_double_offset = next_static_oop_offset + 2650 (fac.static_oop_count * heapOopSize); 2651 if ( fac.static_double_count && 2652 (Universe::field_type_should_be_aligned(T_DOUBLE) || 2653 Universe::field_type_should_be_aligned(T_LONG)) ) { 2654 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 2655 } 2656 2657 next_static_word_offset = next_static_double_offset + 2658 (fac.static_double_count * BytesPerLong); 2659 next_static_short_offset = next_static_word_offset + 2660 (fac.static_word_count * BytesPerInt); 2661 next_static_byte_offset = next_static_short_offset + 2662 (fac.static_short_count * BytesPerShort); 2663 next_static_type_offset = align_size_up((next_static_byte_offset + 2664 fac.static_byte_count ), wordSize ); 2665 static_field_size = (next_static_type_offset - 2666 next_static_oop_offset) / wordSize; 2667 first_nonstatic_field_offset = (instanceOopDesc::header_size() + 2668 nonstatic_field_size) * wordSize; 2669 next_nonstatic_field_offset = first_nonstatic_field_offset; 2670 2671 // Add fake fields for java.lang.Class instances (also see below) 2672 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2673 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle)); 2674 } 2675 2676 // Add a fake "discovered" field if it is not present 2677 // for compatibility with earlier jdk's. 2678 if (class_name() == vmSymbols::java_lang_ref_Reference() 2679 && class_loader.is_null()) { 2680 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle)); 2681 } 2682 // end of "discovered" field compactibility fix 2683 2684 int nonstatic_double_count = fac.nonstatic_double_count; 2685 int nonstatic_word_count = fac.nonstatic_word_count; 2686 int nonstatic_short_count = fac.nonstatic_short_count; 2687 int nonstatic_byte_count = fac.nonstatic_byte_count; 2688 int nonstatic_oop_count = fac.nonstatic_oop_count; 2689 2690 bool super_has_nonstatic_fields = 2691 (super_klass() != NULL && super_klass->has_nonstatic_fields()); 2692 bool has_nonstatic_fields = super_has_nonstatic_fields || 2693 ((nonstatic_double_count + nonstatic_word_count + 2694 nonstatic_short_count + nonstatic_byte_count + 2695 nonstatic_oop_count) != 0); 2696 2697 2698 // Prepare list of oops for oop maps generation. 2699 u2* nonstatic_oop_offsets; 2700 u2* nonstatic_oop_length; 2701 int nonstatic_oop_map_count = 0; 2702 2703 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 2704 THREAD, u2, nonstatic_oop_count+1); 2705 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2706 THREAD, u2, nonstatic_oop_count+1); 2707 2708 // Add fake fields for java.lang.Class instances (also see above). 2709 // FieldsAllocationStyle and CompactFields values will be reset to default. 2710 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2711 java_lang_Class_fix_post(&next_nonstatic_field_offset); 2712 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset; 2713 int fake_oop_count = (( next_nonstatic_field_offset - 2714 first_nonstatic_field_offset ) / heapOopSize); 2715 nonstatic_oop_length [0] = (u2)fake_oop_count; 2716 nonstatic_oop_map_count = 1; 2717 nonstatic_oop_count -= fake_oop_count; 2718 first_nonstatic_oop_offset = first_nonstatic_field_offset; 2719 } else { 2720 first_nonstatic_oop_offset = 0; // will be set for first oop field 2721 } 2722 2723#ifndef PRODUCT 2724 if( PrintCompactFieldsSavings ) { 2725 next_nonstatic_double_offset = next_nonstatic_field_offset + 2726 (nonstatic_oop_count * heapOopSize); 2727 if ( nonstatic_double_count > 0 ) { 2728 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong); 2729 } 2730 next_nonstatic_word_offset = next_nonstatic_double_offset + 2731 (nonstatic_double_count * BytesPerLong); 2732 next_nonstatic_short_offset = next_nonstatic_word_offset + 2733 (nonstatic_word_count * BytesPerInt); 2734 next_nonstatic_byte_offset = next_nonstatic_short_offset + 2735 (nonstatic_short_count * BytesPerShort); 2736 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset + 2737 nonstatic_byte_count ), wordSize ); 2738 orig_nonstatic_field_size = nonstatic_field_size + 2739 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/wordSize); 2740 } 2741#endif 2742 bool compact_fields = CompactFields; 2743 int allocation_style = FieldsAllocationStyle; 2744 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range? 2745 assert(false, "0 <= FieldsAllocationStyle <= 1"); 2746 allocation_style = 1; // Optimistic 2747 } 2748 2749 // The next classes have predefined hard-coded fields offsets 2750 // (see in JavaClasses::compute_hard_coded_offsets()). 2751 // Use default fields allocation order for them. 2752 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 2753 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() || 2754 class_name() == vmSymbols::java_lang_Class() || 2755 class_name() == vmSymbols::java_lang_ClassLoader() || 2756 class_name() == vmSymbols::java_lang_ref_Reference() || 2757 class_name() == vmSymbols::java_lang_ref_SoftReference() || 2758 class_name() == vmSymbols::java_lang_StackTraceElement() || 2759 class_name() == vmSymbols::java_lang_String() || 2760 class_name() == vmSymbols::java_lang_Throwable() || 2761 class_name() == vmSymbols::java_lang_Boolean() || 2762 class_name() == vmSymbols::java_lang_Character() || 2763 class_name() == vmSymbols::java_lang_Float() || 2764 class_name() == vmSymbols::java_lang_Double() || 2765 class_name() == vmSymbols::java_lang_Byte() || 2766 class_name() == vmSymbols::java_lang_Short() || 2767 class_name() == vmSymbols::java_lang_Integer() || 2768 class_name() == vmSymbols::java_lang_Long())) { 2769 allocation_style = 0; // Allocate oops first 2770 compact_fields = false; // Don't compact fields 2771 } 2772 2773 if( allocation_style == 0 ) { 2774 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes 2775 next_nonstatic_oop_offset = next_nonstatic_field_offset; 2776 next_nonstatic_double_offset = next_nonstatic_oop_offset + 2777 (nonstatic_oop_count * heapOopSize); 2778 } else if( allocation_style == 1 ) { 2779 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops 2780 next_nonstatic_double_offset = next_nonstatic_field_offset; 2781 } else { 2782 ShouldNotReachHere(); 2783 } 2784 2785 int nonstatic_oop_space_count = 0; 2786 int nonstatic_word_space_count = 0; 2787 int nonstatic_short_space_count = 0; 2788 int nonstatic_byte_space_count = 0; 2789 int nonstatic_oop_space_offset; 2790 int nonstatic_word_space_offset; 2791 int nonstatic_short_space_offset; 2792 int nonstatic_byte_space_offset; 2793 2794 bool compact_into_header = (UseCompressedOops && 2795 allocation_style == 1 && compact_fields && 2796 !super_has_nonstatic_fields); 2797 2798 if( compact_into_header || nonstatic_double_count > 0 ) { 2799 int offset; 2800 // Pack something in with the header if no super klass has done so. 2801 if (compact_into_header) { 2802 offset = oopDesc::klass_gap_offset_in_bytes(); 2803 } else { 2804 offset = next_nonstatic_double_offset; 2805 } 2806 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 2807 if( compact_fields && offset != next_nonstatic_double_offset ) { 2808 // Allocate available fields into the gap before double field. 2809 int length = next_nonstatic_double_offset - offset; 2810 assert(length == BytesPerInt, ""); 2811 nonstatic_word_space_offset = offset; 2812 if( nonstatic_word_count > 0 ) { 2813 nonstatic_word_count -= 1; 2814 nonstatic_word_space_count = 1; // Only one will fit 2815 length -= BytesPerInt; 2816 offset += BytesPerInt; 2817 } 2818 nonstatic_short_space_offset = offset; 2819 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 2820 nonstatic_short_count -= 1; 2821 nonstatic_short_space_count += 1; 2822 length -= BytesPerShort; 2823 offset += BytesPerShort; 2824 } 2825 nonstatic_byte_space_offset = offset; 2826 while( length > 0 && nonstatic_byte_count > 0 ) { 2827 nonstatic_byte_count -= 1; 2828 nonstatic_byte_space_count += 1; 2829 length -= 1; 2830 } 2831 // Allocate oop field in the gap if there are no other fields for that. 2832 nonstatic_oop_space_offset = offset; 2833 if(!compact_into_header && length >= heapOopSize && 2834 nonstatic_oop_count > 0 && 2835 allocation_style != 0 ) { // when oop fields not first 2836 nonstatic_oop_count -= 1; 2837 nonstatic_oop_space_count = 1; // Only one will fit 2838 length -= heapOopSize; 2839 offset += heapOopSize; 2840 } 2841 } 2842 } 2843 2844 next_nonstatic_word_offset = next_nonstatic_double_offset + 2845 (nonstatic_double_count * BytesPerLong); 2846 next_nonstatic_short_offset = next_nonstatic_word_offset + 2847 (nonstatic_word_count * BytesPerInt); 2848 next_nonstatic_byte_offset = next_nonstatic_short_offset + 2849 (nonstatic_short_count * BytesPerShort); 2850 2851 int notaligned_offset; 2852 if( allocation_style == 0 ) { 2853 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 2854 } else { // allocation_style == 1 2855 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 2856 if( nonstatic_oop_count > 0 ) { 2857 notaligned_offset = next_nonstatic_oop_offset; 2858 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 2859 } 2860 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 2861 } 2862 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); 2863 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset 2864 - first_nonstatic_field_offset)/wordSize); 2865 2866 // Iterate over fields again and compute correct offsets. 2867 // The field allocation type was temporarily stored in the offset slot. 2868 // oop fields are located before non-oop fields (static and non-static). 2869 int len = fields->length(); 2870 for (int i = 0; i < len; i += instanceKlass::next_offset) { 2871 int real_offset; 2872 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4); 2873 switch (atype) { 2874 case STATIC_OOP: 2875 real_offset = next_static_oop_offset; 2876 next_static_oop_offset += heapOopSize; 2877 break; 2878 case STATIC_BYTE: 2879 real_offset = next_static_byte_offset; 2880 next_static_byte_offset += 1; 2881 break; 2882 case STATIC_SHORT: 2883 real_offset = next_static_short_offset; 2884 next_static_short_offset += BytesPerShort; 2885 break; 2886 case STATIC_WORD: 2887 real_offset = next_static_word_offset; 2888 next_static_word_offset += BytesPerInt; 2889 break; 2890 case STATIC_ALIGNED_DOUBLE: 2891 case STATIC_DOUBLE: 2892 real_offset = next_static_double_offset; 2893 next_static_double_offset += BytesPerLong; 2894 break; 2895 case NONSTATIC_OOP: 2896 if( nonstatic_oop_space_count > 0 ) { 2897 real_offset = nonstatic_oop_space_offset; 2898 nonstatic_oop_space_offset += heapOopSize; 2899 nonstatic_oop_space_count -= 1; 2900 } else { 2901 real_offset = next_nonstatic_oop_offset; 2902 next_nonstatic_oop_offset += heapOopSize; 2903 } 2904 // Update oop maps 2905 if( nonstatic_oop_map_count > 0 && 2906 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 2907 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * heapOopSize) ) { 2908 // Extend current oop map 2909 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1; 2910 } else { 2911 // Create new oop map 2912 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset; 2913 nonstatic_oop_length [nonstatic_oop_map_count] = 1; 2914 nonstatic_oop_map_count += 1; 2915 if( first_nonstatic_oop_offset == 0 ) { // Undefined 2916 first_nonstatic_oop_offset = real_offset; 2917 } 2918 } 2919 break; 2920 case NONSTATIC_BYTE: 2921 if( nonstatic_byte_space_count > 0 ) { 2922 real_offset = nonstatic_byte_space_offset; 2923 nonstatic_byte_space_offset += 1; 2924 nonstatic_byte_space_count -= 1; 2925 } else { 2926 real_offset = next_nonstatic_byte_offset; 2927 next_nonstatic_byte_offset += 1; 2928 } 2929 break; 2930 case NONSTATIC_SHORT: 2931 if( nonstatic_short_space_count > 0 ) { 2932 real_offset = nonstatic_short_space_offset; 2933 nonstatic_short_space_offset += BytesPerShort; 2934 nonstatic_short_space_count -= 1; 2935 } else { 2936 real_offset = next_nonstatic_short_offset; 2937 next_nonstatic_short_offset += BytesPerShort; 2938 } 2939 break; 2940 case NONSTATIC_WORD: 2941 if( nonstatic_word_space_count > 0 ) { 2942 real_offset = nonstatic_word_space_offset; 2943 nonstatic_word_space_offset += BytesPerInt; 2944 nonstatic_word_space_count -= 1; 2945 } else { 2946 real_offset = next_nonstatic_word_offset; 2947 next_nonstatic_word_offset += BytesPerInt; 2948 } 2949 break; 2950 case NONSTATIC_ALIGNED_DOUBLE: 2951 case NONSTATIC_DOUBLE: 2952 real_offset = next_nonstatic_double_offset; 2953 next_nonstatic_double_offset += BytesPerLong; 2954 break; 2955 default: 2956 ShouldNotReachHere(); 2957 } 2958 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) ); 2959 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) ); 2960 } 2961 2962 // Size of instances 2963 int instance_size; 2964 2965 instance_size = align_object_size(next_nonstatic_type_offset / wordSize); 2966 2967 assert(instance_size == align_object_size(instanceOopDesc::header_size() + nonstatic_field_size), "consistent layout helper value"); 2968 2969 // Size of non-static oop map blocks (in words) allocated at end of klass 2970 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset); 2971 2972 // Compute reference type 2973 ReferenceType rt; 2974 if (super_klass() == NULL) { 2975 rt = REF_NONE; 2976 } else { 2977 rt = super_klass->reference_type(); 2978 } 2979 2980 // We can now create the basic klassOop for this klass 2981 klassOop ik = oopFactory::new_instanceKlass( 2982 vtable_size, itable_size, 2983 static_field_size, nonstatic_oop_map_size, 2984 rt, CHECK_(nullHandle)); 2985 instanceKlassHandle this_klass (THREAD, ik); 2986 2987 assert(this_klass->static_field_size() == static_field_size && 2988 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check"); 2989 2990 // Fill in information already parsed 2991 this_klass->set_access_flags(access_flags); 2992 jint lh = Klass::instance_layout_helper(instance_size, false); 2993 this_klass->set_layout_helper(lh); 2994 assert(this_klass->oop_is_instance(), "layout is correct"); 2995 assert(this_klass->size_helper() == instance_size, "correct size_helper"); 2996 // Not yet: supers are done below to support the new subtype-checking fields 2997 //this_klass->set_super(super_klass()); 2998 this_klass->set_class_loader(class_loader()); 2999 this_klass->set_nonstatic_field_size(nonstatic_field_size); 3000 this_klass->set_has_nonstatic_fields(has_nonstatic_fields); 3001 this_klass->set_static_oop_field_size(fac.static_oop_count); 3002 cp->set_pool_holder(this_klass()); 3003 this_klass->set_constants(cp()); 3004 this_klass->set_local_interfaces(local_interfaces()); 3005 this_klass->set_fields(fields()); 3006 this_klass->set_methods(methods()); 3007 if (has_final_method) { 3008 this_klass->set_has_final_method(); 3009 } 3010 this_klass->set_method_ordering(method_ordering()); 3011 this_klass->set_initial_method_idnum(methods->length()); 3012 this_klass->set_name(cp->klass_name_at(this_class_index)); 3013 this_klass->set_protection_domain(protection_domain()); 3014 this_klass->set_fields_annotations(fields_annotations()); 3015 this_klass->set_methods_annotations(methods_annotations()); 3016 this_klass->set_methods_parameter_annotations(methods_parameter_annotations()); 3017 this_klass->set_methods_default_annotations(methods_default_annotations()); 3018 3019 this_klass->set_minor_version(minor_version); 3020 this_klass->set_major_version(major_version); 3021 3022 if (cached_class_file_bytes != NULL) { 3023 // JVMTI: we have an instanceKlass now, tell it about the cached bytes 3024 this_klass->set_cached_class_file(cached_class_file_bytes, 3025 cached_class_file_length); 3026 } 3027 3028 // Miranda methods 3029 if ((num_miranda_methods > 0) || 3030 // if this class introduced new miranda methods or 3031 (super_klass.not_null() && (super_klass->has_miranda_methods())) 3032 // super class exists and this class inherited miranda methods 3033 ) { 3034 this_klass->set_has_miranda_methods(); // then set a flag 3035 } 3036 3037 // Additional attributes 3038 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle)); 3039 3040 // Make sure this is the end of class file stream 3041 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3042 3043 // Initialize static fields 3044 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle)); 3045 3046 // VerifyOops believes that once this has been set, the object is completely loaded. 3047 // Compute transitive closure of interfaces this class implements 3048 this_klass->set_transitive_interfaces(transitive_interfaces()); 3049 3050 // Fill in information needed to compute superclasses. 3051 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 3052 3053 // Initialize itable offset tables 3054 klassItable::setup_itable_offset_table(this_klass); 3055 3056 // Do final class setup 3057 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length); 3058 3059 set_precomputed_flags(this_klass); 3060 3061 // reinitialize modifiers, using the InnerClasses attribute 3062 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 3063 this_klass->set_modifier_flags(computed_modifiers); 3064 3065 // check if this class can access its super class 3066 check_super_class_access(this_klass, CHECK_(nullHandle)); 3067 3068 // check if this class can access its superinterfaces 3069 check_super_interface_access(this_klass, CHECK_(nullHandle)); 3070 3071 // check if this class overrides any final method 3072 check_final_method_override(this_klass, CHECK_(nullHandle)); 3073 3074 // check that if this class is an interface then it doesn't have static methods 3075 if (this_klass->is_interface()) { 3076 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 3077 } 3078 3079 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()), 3080 false /* not shared class */); 3081 3082 if (TraceClassLoading) { 3083 // print in a single call to reduce interleaving of output 3084 if (cfs->source() != NULL) { 3085 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3086 cfs->source()); 3087 } else if (class_loader.is_null()) { 3088 if (THREAD->is_Java_thread()) { 3089 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 3090 tty->print("[Loaded %s by instance of %s]\n", 3091 this_klass->external_name(), 3092 instanceKlass::cast(caller)->external_name()); 3093 } else { 3094 tty->print("[Loaded %s]\n", this_klass->external_name()); 3095 } 3096 } else { 3097 ResourceMark rm; 3098 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3099 instanceKlass::cast(class_loader->klass())->external_name()); 3100 } 3101 } 3102 3103 if (TraceClassResolution) { 3104 // print out the superclass. 3105 const char * from = Klass::cast(this_klass())->external_name(); 3106 if (this_klass->java_super() != NULL) { 3107 tty->print("RESOLVE %s %s\n", from, instanceKlass::cast(this_klass->java_super())->external_name()); 3108 } 3109 // print out each of the interface classes referred to by this class. 3110 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces()); 3111 if (!local_interfaces.is_null()) { 3112 int length = local_interfaces->length(); 3113 for (int i = 0; i < length; i++) { 3114 klassOop k = klassOop(local_interfaces->obj_at(i)); 3115 instanceKlass* to_class = instanceKlass::cast(k); 3116 const char * to = to_class->external_name(); 3117 tty->print("RESOLVE %s %s\n", from, to); 3118 } 3119 } 3120 } 3121 3122#ifndef PRODUCT 3123 if( PrintCompactFieldsSavings ) { 3124 if( nonstatic_field_size < orig_nonstatic_field_size ) { 3125 tty->print("[Saved %d of %3d words in %s]\n", 3126 orig_nonstatic_field_size - nonstatic_field_size, 3127 orig_nonstatic_field_size, this_klass->external_name()); 3128 } else if( nonstatic_field_size > orig_nonstatic_field_size ) { 3129 tty->print("[Wasted %d over %3d words in %s]\n", 3130 nonstatic_field_size - orig_nonstatic_field_size, 3131 orig_nonstatic_field_size, this_klass->external_name()); 3132 } 3133 } 3134#endif 3135 3136 // preserve result across HandleMark 3137 preserve_this_klass = this_klass(); 3138 } 3139 3140 // Create new handle outside HandleMark 3141 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 3142 debug_only(this_klass->as_klassOop()->verify();) 3143 3144 return this_klass; 3145} 3146 3147 3148int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) { 3149 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size(); 3150 if (nonstatic_oop_map_count > 0) { 3151 // We have oops to add to map 3152 if (map_size == 0) { 3153 map_size = nonstatic_oop_map_count; 3154 } else { 3155 // Check whether we should add a new map block or whether the last one can be extended 3156 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps(); 3157 OopMapBlock* last_map = first_map + map_size - 1; 3158 3159 int next_offset = last_map->offset() + (last_map->length() * heapOopSize); 3160 if (next_offset == first_nonstatic_oop_offset) { 3161 // There is no gap bettwen superklass's last oop field and first 3162 // local oop field, merge maps. 3163 nonstatic_oop_map_count -= 1; 3164 } else { 3165 // Superklass didn't end with a oop field, add extra maps 3166 assert(next_offset<first_nonstatic_oop_offset, "just checking"); 3167 } 3168 map_size += nonstatic_oop_map_count; 3169 } 3170 } 3171 return map_size; 3172} 3173 3174 3175void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 3176 int nonstatic_oop_map_count, 3177 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) { 3178 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 3179 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size(); 3180 instanceKlass* super = k->superklass(); 3181 if (super != NULL) { 3182 int super_oop_map_size = super->nonstatic_oop_map_size(); 3183 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 3184 // Copy maps from superklass 3185 while (super_oop_map_size-- > 0) { 3186 *this_oop_map++ = *super_oop_map++; 3187 } 3188 } 3189 if (nonstatic_oop_map_count > 0) { 3190 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) { 3191 // Calculated in compute_oop_map_size() number of oop maps is less then 3192 // collected oop maps since there is no gap between superklass's last oop 3193 // field and first local oop field. Extend the last oop map copied 3194 // from the superklass instead of creating new one. 3195 nonstatic_oop_map_count--; 3196 nonstatic_oop_offsets++; 3197 this_oop_map--; 3198 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++); 3199 this_oop_map++; 3200 } 3201 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking"); 3202 // Add new map blocks, fill them 3203 while (nonstatic_oop_map_count-- > 0) { 3204 this_oop_map->set_offset(*nonstatic_oop_offsets++); 3205 this_oop_map->set_length(*nonstatic_oop_length++); 3206 this_oop_map++; 3207 } 3208 } 3209} 3210 3211 3212void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 3213 klassOop super = k->super(); 3214 3215 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 3216 // in which case we don't have to register objects as finalizable 3217 if (!_has_empty_finalizer) { 3218 if (_has_finalizer || 3219 (super != NULL && super->klass_part()->has_finalizer())) { 3220 k->set_has_finalizer(); 3221 } 3222 } 3223 3224#ifdef ASSERT 3225 bool f = false; 3226 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(), 3227 vmSymbols::void_method_signature()); 3228 if (m != NULL && !m->is_empty_method()) { 3229 f = true; 3230 } 3231 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 3232#endif 3233 3234 // Check if this klass supports the java.lang.Cloneable interface 3235 if (SystemDictionary::cloneable_klass_loaded()) { 3236 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) { 3237 k->set_is_cloneable(); 3238 } 3239 } 3240 3241 // Check if this klass has a vanilla default constructor 3242 if (super == NULL) { 3243 // java.lang.Object has empty default constructor 3244 k->set_has_vanilla_constructor(); 3245 } else { 3246 if (Klass::cast(super)->has_vanilla_constructor() && 3247 _has_vanilla_constructor) { 3248 k->set_has_vanilla_constructor(); 3249 } 3250#ifdef ASSERT 3251 bool v = false; 3252 if (Klass::cast(super)->has_vanilla_constructor()) { 3253 methodOop constructor = k->find_method(vmSymbols::object_initializer_name( 3254), vmSymbols::void_method_signature()); 3255 if (constructor != NULL && constructor->is_vanilla_constructor()) { 3256 v = true; 3257 } 3258 } 3259 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 3260#endif 3261 } 3262 3263 // If it cannot be fast-path allocated, set a bit in the layout helper. 3264 // See documentation of instanceKlass::can_be_fastpath_allocated(). 3265 assert(k->size_helper() > 0, "layout_helper is initialized"); 3266 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 3267 || k->is_abstract() || k->is_interface() 3268 || (k->name() == vmSymbols::java_lang_Class() 3269 && k->class_loader() == NULL) 3270 || k->size_helper() >= FastAllocateSizeLimit) { 3271 // Forbid fast-path allocation. 3272 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 3273 k->set_layout_helper(lh); 3274 } 3275} 3276 3277 3278// utility method for appending and array with check for duplicates 3279 3280void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) { 3281 // iterate over new interfaces 3282 for (int i = 0; i < ifs->length(); i++) { 3283 oop e = ifs->obj_at(i); 3284 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking"); 3285 // check for duplicates 3286 bool duplicate = false; 3287 for (int j = 0; j < index; j++) { 3288 if (result->obj_at(j) == e) { 3289 duplicate = true; 3290 break; 3291 } 3292 } 3293 // add new interface 3294 if (!duplicate) { 3295 result->obj_at_put(index++, e); 3296 } 3297 } 3298} 3299 3300objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) { 3301 // Compute maximum size for transitive interfaces 3302 int max_transitive_size = 0; 3303 int super_size = 0; 3304 // Add superclass transitive interfaces size 3305 if (super.not_null()) { 3306 super_size = super->transitive_interfaces()->length(); 3307 max_transitive_size += super_size; 3308 } 3309 // Add local interfaces' super interfaces 3310 int local_size = local_ifs->length(); 3311 for (int i = 0; i < local_size; i++) { 3312 klassOop l = klassOop(local_ifs->obj_at(i)); 3313 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length(); 3314 } 3315 // Finally add local interfaces 3316 max_transitive_size += local_size; 3317 // Construct array 3318 objArrayHandle result; 3319 if (max_transitive_size == 0) { 3320 // no interfaces, use canonicalized array 3321 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 3322 } else if (max_transitive_size == super_size) { 3323 // no new local interfaces added, share superklass' transitive interface array 3324 result = objArrayHandle(THREAD, super->transitive_interfaces()); 3325 } else if (max_transitive_size == local_size) { 3326 // only local interfaces added, share local interface array 3327 result = local_ifs; 3328 } else { 3329 objArrayHandle nullHandle; 3330 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle)); 3331 result = objArrayHandle(THREAD, new_objarray); 3332 int index = 0; 3333 // Copy down from superclass 3334 if (super.not_null()) { 3335 append_interfaces(result, index, super->transitive_interfaces()); 3336 } 3337 // Copy down from local interfaces' superinterfaces 3338 for (int i = 0; i < local_ifs->length(); i++) { 3339 klassOop l = klassOop(local_ifs->obj_at(i)); 3340 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces()); 3341 } 3342 // Finally add local interfaces 3343 append_interfaces(result, index, local_ifs()); 3344 3345 // Check if duplicates were removed 3346 if (index != max_transitive_size) { 3347 assert(index < max_transitive_size, "just checking"); 3348 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle)); 3349 for (int i = 0; i < index; i++) { 3350 oop e = result->obj_at(i); 3351 assert(e != NULL, "just checking"); 3352 new_result->obj_at_put(i, e); 3353 } 3354 result = objArrayHandle(THREAD, new_result); 3355 } 3356 } 3357 return result; 3358} 3359 3360 3361void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 3362 klassOop super = this_klass->super(); 3363 if ((super != NULL) && 3364 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) { 3365 ResourceMark rm(THREAD); 3366 Exceptions::fthrow( 3367 THREAD_AND_LOCATION, 3368 vmSymbolHandles::java_lang_IllegalAccessError(), 3369 "class %s cannot access its superclass %s", 3370 this_klass->external_name(), 3371 instanceKlass::cast(super)->external_name() 3372 ); 3373 return; 3374 } 3375} 3376 3377 3378void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 3379 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces()); 3380 int lng = local_interfaces->length(); 3381 for (int i = lng - 1; i >= 0; i--) { 3382 klassOop k = klassOop(local_interfaces->obj_at(i)); 3383 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface"); 3384 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) { 3385 ResourceMark rm(THREAD); 3386 Exceptions::fthrow( 3387 THREAD_AND_LOCATION, 3388 vmSymbolHandles::java_lang_IllegalAccessError(), 3389 "class %s cannot access its superinterface %s", 3390 this_klass->external_name(), 3391 instanceKlass::cast(k)->external_name() 3392 ); 3393 return; 3394 } 3395 } 3396} 3397 3398 3399void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 3400 objArrayHandle methods (THREAD, this_klass->methods()); 3401 int num_methods = methods->length(); 3402 3403 // go thru each method and check if it overrides a final method 3404 for (int index = 0; index < num_methods; index++) { 3405 methodOop m = (methodOop)methods->obj_at(index); 3406 3407 // skip private, static and <init> methods 3408 if ((!m->is_private()) && 3409 (!m->is_static()) && 3410 (m->name() != vmSymbols::object_initializer_name())) { 3411 3412 symbolOop name = m->name(); 3413 symbolOop signature = m->signature(); 3414 klassOop k = this_klass->super(); 3415 methodOop super_m = NULL; 3416 while (k != NULL) { 3417 // skip supers that don't have final methods. 3418 if (k->klass_part()->has_final_method()) { 3419 // lookup a matching method in the super class hierarchy 3420 super_m = instanceKlass::cast(k)->lookup_method(name, signature); 3421 if (super_m == NULL) { 3422 break; // didn't find any match; get out 3423 } 3424 3425 if (super_m->is_final() && 3426 // matching method in super is final 3427 (Reflection::verify_field_access(this_klass->as_klassOop(), 3428 super_m->method_holder(), 3429 super_m->method_holder(), 3430 super_m->access_flags(), false)) 3431 // this class can access super final method and therefore override 3432 ) { 3433 ResourceMark rm(THREAD); 3434 Exceptions::fthrow( 3435 THREAD_AND_LOCATION, 3436 vmSymbolHandles::java_lang_VerifyError(), 3437 "class %s overrides final method %s.%s", 3438 this_klass->external_name(), 3439 name->as_C_string(), 3440 signature->as_C_string() 3441 ); 3442 return; 3443 } 3444 3445 // continue to look from super_m's holder's super. 3446 k = instanceKlass::cast(super_m->method_holder())->super(); 3447 continue; 3448 } 3449 3450 k = k->klass_part()->super(); 3451 } 3452 } 3453 } 3454} 3455 3456 3457// assumes that this_klass is an interface 3458void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 3459 assert(this_klass->is_interface(), "not an interface"); 3460 objArrayHandle methods (THREAD, this_klass->methods()); 3461 int num_methods = methods->length(); 3462 3463 for (int index = 0; index < num_methods; index++) { 3464 methodOop m = (methodOop)methods->obj_at(index); 3465 // if m is static and not the init method, throw a verify error 3466 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 3467 ResourceMark rm(THREAD); 3468 Exceptions::fthrow( 3469 THREAD_AND_LOCATION, 3470 vmSymbolHandles::java_lang_VerifyError(), 3471 "Illegal static method %s in interface %s", 3472 m->name()->as_C_string(), 3473 this_klass->external_name() 3474 ); 3475 return; 3476 } 3477 } 3478} 3479 3480// utility methods for format checking 3481 3482void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 3483 if (!_need_verify) { return; } 3484 3485 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3486 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3487 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3488 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 3489 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3490 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 3491 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3492 3493 if ((is_abstract && is_final) || 3494 (is_interface && !is_abstract) || 3495 (is_interface && major_gte_15 && (is_super || is_enum)) || 3496 (!is_interface && major_gte_15 && is_annotation)) { 3497 ResourceMark rm(THREAD); 3498 Exceptions::fthrow( 3499 THREAD_AND_LOCATION, 3500 vmSymbolHandles::java_lang_ClassFormatError(), 3501 "Illegal class modifiers in class %s: 0x%X", 3502 _class_name->as_C_string(), flags 3503 ); 3504 return; 3505 } 3506} 3507 3508bool ClassFileParser::has_illegal_visibility(jint flags) { 3509 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3510 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3511 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3512 3513 return ((is_public && is_protected) || 3514 (is_public && is_private) || 3515 (is_protected && is_private)); 3516} 3517 3518bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 3519 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 3520 (major <= JAVA_MAX_SUPPORTED_VERSION) && 3521 ((major != JAVA_MAX_SUPPORTED_VERSION) || 3522 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 3523} 3524 3525void ClassFileParser::verify_legal_field_modifiers( 3526 jint flags, bool is_interface, TRAPS) { 3527 if (!_need_verify) { return; } 3528 3529 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3530 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3531 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3532 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3533 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3534 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 3535 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 3536 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3537 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3538 3539 bool is_illegal = false; 3540 3541 if (is_interface) { 3542 if (!is_public || !is_static || !is_final || is_private || 3543 is_protected || is_volatile || is_transient || 3544 (major_gte_15 && is_enum)) { 3545 is_illegal = true; 3546 } 3547 } else { // not interface 3548 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 3549 is_illegal = true; 3550 } 3551 } 3552 3553 if (is_illegal) { 3554 ResourceMark rm(THREAD); 3555 Exceptions::fthrow( 3556 THREAD_AND_LOCATION, 3557 vmSymbolHandles::java_lang_ClassFormatError(), 3558 "Illegal field modifiers in class %s: 0x%X", 3559 _class_name->as_C_string(), flags); 3560 return; 3561 } 3562} 3563 3564void ClassFileParser::verify_legal_method_modifiers( 3565 jint flags, bool is_interface, symbolHandle name, TRAPS) { 3566 if (!_need_verify) { return; } 3567 3568 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3569 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3570 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3571 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3572 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 3573 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3574 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 3575 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 3576 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 3577 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3578 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 3579 3580 bool is_illegal = false; 3581 3582 if (is_interface) { 3583 if (!is_abstract || !is_public || is_static || is_final || 3584 is_native || (major_gte_15 && (is_synchronized || is_strict))) { 3585 is_illegal = true; 3586 } 3587 } else { // not interface 3588 if (is_initializer) { 3589 if (is_static || is_final || is_synchronized || is_native || 3590 is_abstract || (major_gte_15 && is_bridge)) { 3591 is_illegal = true; 3592 } 3593 } else { // not initializer 3594 if (is_abstract) { 3595 if ((is_final || is_native || is_private || is_static || 3596 (major_gte_15 && (is_synchronized || is_strict)))) { 3597 is_illegal = true; 3598 } 3599 } 3600 if (has_illegal_visibility(flags)) { 3601 is_illegal = true; 3602 } 3603 } 3604 } 3605 3606 if (is_illegal) { 3607 ResourceMark rm(THREAD); 3608 Exceptions::fthrow( 3609 THREAD_AND_LOCATION, 3610 vmSymbolHandles::java_lang_ClassFormatError(), 3611 "Method %s in class %s has illegal modifiers: 0x%X", 3612 name->as_C_string(), _class_name->as_C_string(), flags); 3613 return; 3614 } 3615} 3616 3617void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 3618 assert(_need_verify, "only called when _need_verify is true"); 3619 int i = 0; 3620 int count = length >> 2; 3621 for (int k=0; k<count; k++) { 3622 unsigned char b0 = buffer[i]; 3623 unsigned char b1 = buffer[i+1]; 3624 unsigned char b2 = buffer[i+2]; 3625 unsigned char b3 = buffer[i+3]; 3626 // For an unsigned char v, 3627 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 3628 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 3629 unsigned char res = b0 | b0 - 1 | 3630 b1 | b1 - 1 | 3631 b2 | b2 - 1 | 3632 b3 | b3 - 1; 3633 if (res >= 128) break; 3634 i += 4; 3635 } 3636 for(; i < length; i++) { 3637 unsigned short c; 3638 // no embedded zeros 3639 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 3640 if(buffer[i] < 128) { 3641 continue; 3642 } 3643 if ((i + 5) < length) { // see if it's legal supplementary character 3644 if (UTF8::is_supplementary_character(&buffer[i])) { 3645 c = UTF8::get_supplementary_character(&buffer[i]); 3646 i += 5; 3647 continue; 3648 } 3649 } 3650 switch (buffer[i] >> 4) { 3651 default: break; 3652 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 3653 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3654 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 3655 c = (buffer[i] & 0x1F) << 6; 3656 i++; 3657 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 3658 c += buffer[i] & 0x3F; 3659 if (_major_version <= 47 || c == 0 || c >= 0x80) { 3660 // for classes with major > 47, c must a null or a character in its shortest form 3661 break; 3662 } 3663 } 3664 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3665 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 3666 c = (buffer[i] & 0xF) << 12; 3667 i += 2; 3668 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 3669 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 3670 if (_major_version <= 47 || c >= 0x800) { 3671 // for classes with major > 47, c must be in its shortest form 3672 break; 3673 } 3674 } 3675 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3676 } // end of switch 3677 } // end of for 3678} 3679 3680// Checks if name is a legal class name. 3681void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) { 3682 if (!_need_verify || _relax_verify) { return; } 3683 3684 char buf[fixed_buffer_size]; 3685 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3686 unsigned int length = name->utf8_length(); 3687 bool legal = false; 3688 3689 if (length > 0) { 3690 char* p; 3691 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 3692 p = skip_over_field_signature(bytes, false, length, CHECK); 3693 legal = (p != NULL) && ((p - bytes) == (int)length); 3694 } else if (_major_version < JAVA_1_5_VERSION) { 3695 if (bytes[0] != '<') { 3696 p = skip_over_field_name(bytes, true, length); 3697 legal = (p != NULL) && ((p - bytes) == (int)length); 3698 } 3699 } else { 3700 // 4900761: relax the constraints based on JSR202 spec 3701 // Class names may be drawn from the entire Unicode character set. 3702 // Identifiers between '/' must be unqualified names. 3703 // The utf8 string has been verified when parsing cpool entries. 3704 legal = verify_unqualified_name(bytes, length, LegalClass); 3705 } 3706 } 3707 if (!legal) { 3708 ResourceMark rm(THREAD); 3709 Exceptions::fthrow( 3710 THREAD_AND_LOCATION, 3711 vmSymbolHandles::java_lang_ClassFormatError(), 3712 "Illegal class name \"%s\" in class file %s", bytes, 3713 _class_name->as_C_string() 3714 ); 3715 return; 3716 } 3717} 3718 3719// Checks if name is a legal field name. 3720void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) { 3721 if (!_need_verify || _relax_verify) { return; } 3722 3723 char buf[fixed_buffer_size]; 3724 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3725 unsigned int length = name->utf8_length(); 3726 bool legal = false; 3727 3728 if (length > 0) { 3729 if (_major_version < JAVA_1_5_VERSION) { 3730 if (bytes[0] != '<') { 3731 char* p = skip_over_field_name(bytes, false, length); 3732 legal = (p != NULL) && ((p - bytes) == (int)length); 3733 } 3734 } else { 3735 // 4881221: relax the constraints based on JSR202 spec 3736 legal = verify_unqualified_name(bytes, length, LegalField); 3737 } 3738 } 3739 3740 if (!legal) { 3741 ResourceMark rm(THREAD); 3742 Exceptions::fthrow( 3743 THREAD_AND_LOCATION, 3744 vmSymbolHandles::java_lang_ClassFormatError(), 3745 "Illegal field name \"%s\" in class %s", bytes, 3746 _class_name->as_C_string() 3747 ); 3748 return; 3749 } 3750} 3751 3752// Checks if name is a legal method name. 3753void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) { 3754 if (!_need_verify || _relax_verify) { return; } 3755 3756 assert(!name.is_null(), "method name is null"); 3757 char buf[fixed_buffer_size]; 3758 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3759 unsigned int length = name->utf8_length(); 3760 bool legal = false; 3761 3762 if (length > 0) { 3763 if (bytes[0] == '<') { 3764 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 3765 legal = true; 3766 } 3767 } else if (_major_version < JAVA_1_5_VERSION) { 3768 char* p; 3769 p = skip_over_field_name(bytes, false, length); 3770 legal = (p != NULL) && ((p - bytes) == (int)length); 3771 } else { 3772 // 4881221: relax the constraints based on JSR202 spec 3773 legal = verify_unqualified_name(bytes, length, LegalMethod); 3774 } 3775 } 3776 3777 if (!legal) { 3778 ResourceMark rm(THREAD); 3779 Exceptions::fthrow( 3780 THREAD_AND_LOCATION, 3781 vmSymbolHandles::java_lang_ClassFormatError(), 3782 "Illegal method name \"%s\" in class %s", bytes, 3783 _class_name->as_C_string() 3784 ); 3785 return; 3786 } 3787} 3788 3789 3790// Checks if signature is a legal field signature. 3791void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) { 3792 if (!_need_verify) { return; } 3793 3794 char buf[fixed_buffer_size]; 3795 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3796 unsigned int length = signature->utf8_length(); 3797 char* p = skip_over_field_signature(bytes, false, length, CHECK); 3798 3799 if (p == NULL || (p - bytes) != (int)length) { 3800 ResourceMark rm(THREAD); 3801 Exceptions::fthrow( 3802 THREAD_AND_LOCATION, 3803 vmSymbolHandles::java_lang_ClassFormatError(), 3804 "Field \"%s\" in class %s has illegal signature \"%s\"", 3805 name->as_C_string(), _class_name->as_C_string(), bytes 3806 ); 3807 return; 3808 } 3809} 3810 3811// Checks if signature is a legal method signature. 3812// Returns number of parameters 3813int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) { 3814 if (!_need_verify) { 3815 // make sure caller's args_size will be less than 0 even for non-static 3816 // method so it will be recomputed in compute_size_of_parameters(). 3817 return -2; 3818 } 3819 3820 unsigned int args_size = 0; 3821 char buf[fixed_buffer_size]; 3822 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3823 unsigned int length = signature->utf8_length(); 3824 char* nextp; 3825 3826 // The first character must be a '(' 3827 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 3828 length--; 3829 // Skip over legal field signatures 3830 nextp = skip_over_field_signature(p, false, length, CHECK_0); 3831 while ((length > 0) && (nextp != NULL)) { 3832 args_size++; 3833 if (p[0] == 'J' || p[0] == 'D') { 3834 args_size++; 3835 } 3836 length -= nextp - p; 3837 p = nextp; 3838 nextp = skip_over_field_signature(p, false, length, CHECK_0); 3839 } 3840 // The first non-signature thing better be a ')' 3841 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 3842 length--; 3843 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 3844 // All internal methods must return void 3845 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 3846 return args_size; 3847 } 3848 } else { 3849 // Now we better just have a return value 3850 nextp = skip_over_field_signature(p, true, length, CHECK_0); 3851 if (nextp && ((int)length == (nextp - p))) { 3852 return args_size; 3853 } 3854 } 3855 } 3856 } 3857 // Report error 3858 ResourceMark rm(THREAD); 3859 Exceptions::fthrow( 3860 THREAD_AND_LOCATION, 3861 vmSymbolHandles::java_lang_ClassFormatError(), 3862 "Method \"%s\" in class %s has illegal signature \"%s\"", 3863 name->as_C_string(), _class_name->as_C_string(), p 3864 ); 3865 return 0; 3866} 3867 3868 3869// Unqualified names may not contain the characters '.', ';', or '/'. 3870// Method names also may not contain the characters '<' or '>', unless <init> or <clinit>. 3871// Note that method names may not be <init> or <clinit> in this method. 3872// Because these names have been checked as special cases before calling this method 3873// in verify_legal_method_name. 3874bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) { 3875 jchar ch; 3876 3877 for (char* p = name; p != name + length; ) { 3878 ch = *p; 3879 if (ch < 128) { 3880 p++; 3881 if (ch == '.' || ch == ';') { 3882 return false; // do not permit '.' or ';' 3883 } 3884 if (type != LegalClass && ch == '/') { 3885 return false; // do not permit '/' unless it's class name 3886 } 3887 if (type == LegalMethod && (ch == '<' || ch == '>')) { 3888 return false; // do not permit '<' or '>' in method names 3889 } 3890 } else { 3891 char* tmp_p = UTF8::next(p, &ch); 3892 p = tmp_p; 3893 } 3894 } 3895 return true; 3896} 3897 3898 3899// Take pointer to a string. Skip over the longest part of the string that could 3900// be taken as a fieldname. Allow '/' if slash_ok is true. 3901// Return a pointer to just past the fieldname. 3902// Return NULL if no fieldname at all was found, or in the case of slash_ok 3903// being true, we saw consecutive slashes (meaning we were looking for a 3904// qualified path but found something that was badly-formed). 3905char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 3906 char* p; 3907 jchar ch; 3908 jboolean last_is_slash = false; 3909 jboolean not_first_ch = false; 3910 3911 for (p = name; p != name + length; not_first_ch = true) { 3912 char* old_p = p; 3913 ch = *p; 3914 if (ch < 128) { 3915 p++; 3916 // quick check for ascii 3917 if ((ch >= 'a' && ch <= 'z') || 3918 (ch >= 'A' && ch <= 'Z') || 3919 (ch == '_' || ch == '$') || 3920 (not_first_ch && ch >= '0' && ch <= '9')) { 3921 last_is_slash = false; 3922 continue; 3923 } 3924 if (slash_ok && ch == '/') { 3925 if (last_is_slash) { 3926 return NULL; // Don't permit consecutive slashes 3927 } 3928 last_is_slash = true; 3929 continue; 3930 } 3931 } else { 3932 jint unicode_ch; 3933 char* tmp_p = UTF8::next_character(p, &unicode_ch); 3934 p = tmp_p; 3935 last_is_slash = false; 3936 // Check if ch is Java identifier start or is Java identifier part 3937 // 4672820: call java.lang.Character methods directly without generating separate tables. 3938 EXCEPTION_MARK; 3939 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass()); 3940 3941 // return value 3942 JavaValue result(T_BOOLEAN); 3943 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 3944 JavaCallArguments args; 3945 args.push_int(unicode_ch); 3946 3947 // public static boolean isJavaIdentifierStart(char ch); 3948 JavaCalls::call_static(&result, 3949 klass, 3950 vmSymbolHandles::isJavaIdentifierStart_name(), 3951 vmSymbolHandles::int_bool_signature(), 3952 &args, 3953 THREAD); 3954 3955 if (HAS_PENDING_EXCEPTION) { 3956 CLEAR_PENDING_EXCEPTION; 3957 return 0; 3958 } 3959 if (result.get_jboolean()) { 3960 continue; 3961 } 3962 3963 if (not_first_ch) { 3964 // public static boolean isJavaIdentifierPart(char ch); 3965 JavaCalls::call_static(&result, 3966 klass, 3967 vmSymbolHandles::isJavaIdentifierPart_name(), 3968 vmSymbolHandles::int_bool_signature(), 3969 &args, 3970 THREAD); 3971 3972 if (HAS_PENDING_EXCEPTION) { 3973 CLEAR_PENDING_EXCEPTION; 3974 return 0; 3975 } 3976 3977 if (result.get_jboolean()) { 3978 continue; 3979 } 3980 } 3981 } 3982 return (not_first_ch) ? old_p : NULL; 3983 } 3984 return (not_first_ch) ? p : NULL; 3985} 3986 3987 3988// Take pointer to a string. Skip over the longest part of the string that could 3989// be taken as a field signature. Allow "void" if void_ok. 3990// Return a pointer to just past the signature. 3991// Return NULL if no legal signature is found. 3992char* ClassFileParser::skip_over_field_signature(char* signature, 3993 bool void_ok, 3994 unsigned int length, 3995 TRAPS) { 3996 unsigned int array_dim = 0; 3997 while (length > 0) { 3998 switch (signature[0]) { 3999 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 4000 case JVM_SIGNATURE_BOOLEAN: 4001 case JVM_SIGNATURE_BYTE: 4002 case JVM_SIGNATURE_CHAR: 4003 case JVM_SIGNATURE_SHORT: 4004 case JVM_SIGNATURE_INT: 4005 case JVM_SIGNATURE_FLOAT: 4006 case JVM_SIGNATURE_LONG: 4007 case JVM_SIGNATURE_DOUBLE: 4008 return signature + 1; 4009 case JVM_SIGNATURE_CLASS: { 4010 if (_major_version < JAVA_1_5_VERSION) { 4011 // Skip over the class name if one is there 4012 char* p = skip_over_field_name(signature + 1, true, --length); 4013 4014 // The next character better be a semicolon 4015 if (p && (p - signature) > 1 && p[0] == ';') { 4016 return p + 1; 4017 } 4018 } else { 4019 // 4900761: For class version > 48, any unicode is allowed in class name. 4020 length--; 4021 signature++; 4022 while (length > 0 && signature[0] != ';') { 4023 if (signature[0] == '.') { 4024 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 4025 } 4026 length--; 4027 signature++; 4028 } 4029 if (signature[0] == ';') { return signature + 1; } 4030 } 4031 4032 return NULL; 4033 } 4034 case JVM_SIGNATURE_ARRAY: 4035 array_dim++; 4036 if (array_dim > 255) { 4037 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4038 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 4039 } 4040 // The rest of what's there better be a legal signature 4041 signature++; 4042 length--; 4043 void_ok = false; 4044 break; 4045 4046 default: 4047 return NULL; 4048 } 4049 } 4050 return NULL; 4051} 4052