classFileParser.cpp revision 579:0fbdb4381b99
1/* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_classFileParser.cpp.incl" 27 28// We generally try to create the oops directly when parsing, rather than allocating 29// temporary data structures and copying the bytes twice. A temporary area is only 30// needed when parsing utf8 entries in the constant pool and when parsing line number 31// tables. 32 33// We add assert in debug mode when class format is not checked. 34 35#define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 36#define JAVA_MIN_SUPPORTED_VERSION 45 37#define JAVA_MAX_SUPPORTED_VERSION 51 38#define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 39 40// Used for two backward compatibility reasons: 41// - to check for new additions to the class file format in JDK1.5 42// - to check for bug fixes in the format checker in JDK1.5 43#define JAVA_1_5_VERSION 49 44 45// Used for backward compatibility reasons: 46// - to check for javac bug fixes that happened after 1.5 47// - also used as the max version when running in jdk6 48#define JAVA_6_VERSION 50 49 50 51void ClassFileParser::parse_constant_pool_entries(constantPoolHandle cp, int length, TRAPS) { 52 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 53 // this function (_current can be allocated in a register, with scalar 54 // replacement of aggregates). The _current pointer is copied back to 55 // stream() when this function returns. DON'T call another method within 56 // this method that uses stream(). 57 ClassFileStream* cfs0 = stream(); 58 ClassFileStream cfs1 = *cfs0; 59 ClassFileStream* cfs = &cfs1; 60#ifdef ASSERT 61 u1* old_current = cfs0->current(); 62#endif 63 64 // Used for batching symbol allocations. 65 const char* names[SymbolTable::symbol_alloc_batch_size]; 66 int lengths[SymbolTable::symbol_alloc_batch_size]; 67 int indices[SymbolTable::symbol_alloc_batch_size]; 68 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 69 int names_count = 0; 70 71 // parsing Index 0 is unused 72 for (int index = 1; index < length; index++) { 73 // Each of the following case guarantees one more byte in the stream 74 // for the following tag or the access_flags following constant pool, 75 // so we don't need bounds-check for reading tag. 76 u1 tag = cfs->get_u1_fast(); 77 switch (tag) { 78 case JVM_CONSTANT_Class : 79 { 80 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 81 u2 name_index = cfs->get_u2_fast(); 82 cp->klass_index_at_put(index, name_index); 83 } 84 break; 85 case JVM_CONSTANT_Fieldref : 86 { 87 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 88 u2 class_index = cfs->get_u2_fast(); 89 u2 name_and_type_index = cfs->get_u2_fast(); 90 cp->field_at_put(index, class_index, name_and_type_index); 91 } 92 break; 93 case JVM_CONSTANT_Methodref : 94 { 95 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 96 u2 class_index = cfs->get_u2_fast(); 97 u2 name_and_type_index = cfs->get_u2_fast(); 98 cp->method_at_put(index, class_index, name_and_type_index); 99 } 100 break; 101 case JVM_CONSTANT_InterfaceMethodref : 102 { 103 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 104 u2 class_index = cfs->get_u2_fast(); 105 u2 name_and_type_index = cfs->get_u2_fast(); 106 cp->interface_method_at_put(index, class_index, name_and_type_index); 107 } 108 break; 109 case JVM_CONSTANT_String : 110 { 111 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 112 u2 string_index = cfs->get_u2_fast(); 113 cp->string_index_at_put(index, string_index); 114 } 115 break; 116 case JVM_CONSTANT_Integer : 117 { 118 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 119 u4 bytes = cfs->get_u4_fast(); 120 cp->int_at_put(index, (jint) bytes); 121 } 122 break; 123 case JVM_CONSTANT_Float : 124 { 125 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 126 u4 bytes = cfs->get_u4_fast(); 127 cp->float_at_put(index, *(jfloat*)&bytes); 128 } 129 break; 130 case JVM_CONSTANT_Long : 131 // A mangled type might cause you to overrun allocated memory 132 guarantee_property(index+1 < length, 133 "Invalid constant pool entry %u in class file %s", 134 index, CHECK); 135 { 136 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 137 u8 bytes = cfs->get_u8_fast(); 138 cp->long_at_put(index, bytes); 139 } 140 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 141 break; 142 case JVM_CONSTANT_Double : 143 // A mangled type might cause you to overrun allocated memory 144 guarantee_property(index+1 < length, 145 "Invalid constant pool entry %u in class file %s", 146 index, CHECK); 147 { 148 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 149 u8 bytes = cfs->get_u8_fast(); 150 cp->double_at_put(index, *(jdouble*)&bytes); 151 } 152 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 153 break; 154 case JVM_CONSTANT_NameAndType : 155 { 156 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 157 u2 name_index = cfs->get_u2_fast(); 158 u2 signature_index = cfs->get_u2_fast(); 159 cp->name_and_type_at_put(index, name_index, signature_index); 160 } 161 break; 162 case JVM_CONSTANT_Utf8 : 163 { 164 cfs->guarantee_more(2, CHECK); // utf8_length 165 u2 utf8_length = cfs->get_u2_fast(); 166 u1* utf8_buffer = cfs->get_u1_buffer(); 167 assert(utf8_buffer != NULL, "null utf8 buffer"); 168 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 169 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 170 cfs->skip_u1_fast(utf8_length); 171 172 // Before storing the symbol, make sure it's legal 173 if (_need_verify) { 174 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 175 } 176 177 if (AnonymousClasses && has_cp_patch_at(index)) { 178 Handle patch = clear_cp_patch_at(index); 179 guarantee_property(java_lang_String::is_instance(patch()), 180 "Illegal utf8 patch at %d in class file %s", 181 index, CHECK); 182 char* str = java_lang_String::as_utf8_string(patch()); 183 // (could use java_lang_String::as_symbol instead, but might as well batch them) 184 utf8_buffer = (u1*) str; 185 utf8_length = (int) strlen(str); 186 } 187 188 unsigned int hash; 189 symbolOop result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 190 if (result == NULL) { 191 names[names_count] = (char*)utf8_buffer; 192 lengths[names_count] = utf8_length; 193 indices[names_count] = index; 194 hashValues[names_count++] = hash; 195 if (names_count == SymbolTable::symbol_alloc_batch_size) { 196 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 197 names_count = 0; 198 } 199 } else { 200 cp->symbol_at_put(index, result); 201 } 202 } 203 break; 204 default: 205 classfile_parse_error( 206 "Unknown constant tag %u in class file %s", tag, CHECK); 207 break; 208 } 209 } 210 211 // Allocate the remaining symbols 212 if (names_count > 0) { 213 oopFactory::new_symbols(cp, names_count, names, lengths, indices, hashValues, CHECK); 214 } 215 216 // Copy _current pointer of local copy back to stream(). 217#ifdef ASSERT 218 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 219#endif 220 cfs0->set_current(cfs1.current()); 221} 222 223bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 224 225constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 226 ClassFileStream* cfs = stream(); 227 constantPoolHandle nullHandle; 228 229 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 230 u2 length = cfs->get_u2_fast(); 231 guarantee_property( 232 length >= 1, "Illegal constant pool size %u in class file %s", 233 length, CHECK_(nullHandle)); 234 constantPoolOop constant_pool = 235 oopFactory::new_constantPool(length, 236 methodOopDesc::IsSafeConc, 237 CHECK_(nullHandle)); 238 constantPoolHandle cp (THREAD, constant_pool); 239 240 cp->set_partially_loaded(); // Enables heap verify to work on partial constantPoolOops 241 242 // parsing constant pool entries 243 parse_constant_pool_entries(cp, length, CHECK_(nullHandle)); 244 245 int index = 1; // declared outside of loops for portability 246 247 // first verification pass - validate cross references and fixup class and string constants 248 for (index = 1; index < length; index++) { // Index 0 is unused 249 switch (cp->tag_at(index).value()) { 250 case JVM_CONSTANT_Class : 251 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 252 break; 253 case JVM_CONSTANT_Fieldref : 254 // fall through 255 case JVM_CONSTANT_Methodref : 256 // fall through 257 case JVM_CONSTANT_InterfaceMethodref : { 258 if (!_need_verify) break; 259 int klass_ref_index = cp->klass_ref_index_at(index); 260 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 261 check_property(valid_cp_range(klass_ref_index, length) && 262 is_klass_reference(cp, klass_ref_index), 263 "Invalid constant pool index %u in class file %s", 264 klass_ref_index, 265 CHECK_(nullHandle)); 266 check_property(valid_cp_range(name_and_type_ref_index, length) && 267 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 268 "Invalid constant pool index %u in class file %s", 269 name_and_type_ref_index, 270 CHECK_(nullHandle)); 271 break; 272 } 273 case JVM_CONSTANT_String : 274 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 275 break; 276 case JVM_CONSTANT_Integer : 277 break; 278 case JVM_CONSTANT_Float : 279 break; 280 case JVM_CONSTANT_Long : 281 case JVM_CONSTANT_Double : 282 index++; 283 check_property( 284 (index < length && cp->tag_at(index).is_invalid()), 285 "Improper constant pool long/double index %u in class file %s", 286 index, CHECK_(nullHandle)); 287 break; 288 case JVM_CONSTANT_NameAndType : { 289 if (!_need_verify) break; 290 int name_ref_index = cp->name_ref_index_at(index); 291 int signature_ref_index = cp->signature_ref_index_at(index); 292 check_property( 293 valid_cp_range(name_ref_index, length) && 294 cp->tag_at(name_ref_index).is_utf8(), 295 "Invalid constant pool index %u in class file %s", 296 name_ref_index, CHECK_(nullHandle)); 297 check_property( 298 valid_cp_range(signature_ref_index, length) && 299 cp->tag_at(signature_ref_index).is_utf8(), 300 "Invalid constant pool index %u in class file %s", 301 signature_ref_index, CHECK_(nullHandle)); 302 break; 303 } 304 case JVM_CONSTANT_Utf8 : 305 break; 306 case JVM_CONSTANT_UnresolvedClass : // fall-through 307 case JVM_CONSTANT_UnresolvedClassInError: 308 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 309 break; 310 case JVM_CONSTANT_ClassIndex : 311 { 312 int class_index = cp->klass_index_at(index); 313 check_property( 314 valid_cp_range(class_index, length) && 315 cp->tag_at(class_index).is_utf8(), 316 "Invalid constant pool index %u in class file %s", 317 class_index, CHECK_(nullHandle)); 318 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 319 } 320 break; 321 case JVM_CONSTANT_UnresolvedString : 322 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 323 break; 324 case JVM_CONSTANT_StringIndex : 325 { 326 int string_index = cp->string_index_at(index); 327 check_property( 328 valid_cp_range(string_index, length) && 329 cp->tag_at(string_index).is_utf8(), 330 "Invalid constant pool index %u in class file %s", 331 string_index, CHECK_(nullHandle)); 332 symbolOop sym = cp->symbol_at(string_index); 333 cp->unresolved_string_at_put(index, sym); 334 } 335 break; 336 default: 337 fatal1("bad constant pool tag value %u", cp->tag_at(index).value()); 338 ShouldNotReachHere(); 339 break; 340 } // end of switch 341 } // end of for 342 343 if (_cp_patches != NULL) { 344 // need to treat this_class specially... 345 assert(AnonymousClasses, ""); 346 int this_class_index; 347 { 348 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 349 u1* mark = cfs->current(); 350 u2 flags = cfs->get_u2_fast(); 351 this_class_index = cfs->get_u2_fast(); 352 cfs->set_current(mark); // revert to mark 353 } 354 355 for (index = 1; index < length; index++) { // Index 0 is unused 356 if (has_cp_patch_at(index)) { 357 guarantee_property(index != this_class_index, 358 "Illegal constant pool patch to self at %d in class file %s", 359 index, CHECK_(nullHandle)); 360 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 361 } 362 } 363 // Ensure that all the patches have been used. 364 for (index = 0; index < _cp_patches->length(); index++) { 365 guarantee_property(!has_cp_patch_at(index), 366 "Unused constant pool patch at %d in class file %s", 367 index, CHECK_(nullHandle)); 368 } 369 } 370 371 if (!_need_verify) { 372 return cp; 373 } 374 375 // second verification pass - checks the strings are of the right format. 376 // but not yet to the other entries 377 for (index = 1; index < length; index++) { 378 jbyte tag = cp->tag_at(index).value(); 379 switch (tag) { 380 case JVM_CONSTANT_UnresolvedClass: { 381 symbolHandle class_name(THREAD, cp->unresolved_klass_at(index)); 382 // check the name, even if _cp_patches will overwrite it 383 verify_legal_class_name(class_name, CHECK_(nullHandle)); 384 break; 385 } 386 case JVM_CONSTANT_Fieldref: 387 case JVM_CONSTANT_Methodref: 388 case JVM_CONSTANT_InterfaceMethodref: { 389 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 390 // already verified to be utf8 391 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 392 // already verified to be utf8 393 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 394 symbolHandle name(THREAD, cp->symbol_at(name_ref_index)); 395 symbolHandle signature(THREAD, cp->symbol_at(signature_ref_index)); 396 if (tag == JVM_CONSTANT_Fieldref) { 397 verify_legal_field_name(name, CHECK_(nullHandle)); 398 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 399 } else { 400 verify_legal_method_name(name, CHECK_(nullHandle)); 401 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 402 if (tag == JVM_CONSTANT_Methodref) { 403 // 4509014: If a class method name begins with '<', it must be "<init>". 404 assert(!name.is_null(), "method name in constant pool is null"); 405 unsigned int name_len = name->utf8_length(); 406 assert(name_len > 0, "bad method name"); // already verified as legal name 407 if (name->byte_at(0) == '<') { 408 if (name() != vmSymbols::object_initializer_name()) { 409 classfile_parse_error( 410 "Bad method name at constant pool index %u in class file %s", 411 name_ref_index, CHECK_(nullHandle)); 412 } 413 } 414 } 415 } 416 break; 417 } 418 } // end of switch 419 } // end of for 420 421 return cp; 422} 423 424 425void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 426 assert(AnonymousClasses, ""); 427 BasicType patch_type = T_VOID; 428 switch (cp->tag_at(index).value()) { 429 430 case JVM_CONSTANT_UnresolvedClass : 431 // Patching a class means pre-resolving it. 432 // The name in the constant pool is ignored. 433 if (patch->klass() == SystemDictionary::class_klass()) { // %%% java_lang_Class::is_instance 434 guarantee_property(!java_lang_Class::is_primitive(patch()), 435 "Illegal class patch at %d in class file %s", 436 index, CHECK); 437 cp->klass_at_put(index, java_lang_Class::as_klassOop(patch())); 438 } else { 439 guarantee_property(java_lang_String::is_instance(patch()), 440 "Illegal class patch at %d in class file %s", 441 index, CHECK); 442 symbolHandle name = java_lang_String::as_symbol(patch(), CHECK); 443 cp->unresolved_klass_at_put(index, name()); 444 } 445 break; 446 447 case JVM_CONSTANT_UnresolvedString : 448 // Patching a string means pre-resolving it. 449 // The spelling in the constant pool is ignored. 450 // The constant reference may be any object whatever. 451 // If it is not a real interned string, the constant is referred 452 // to as a "pseudo-string", and must be presented to the CP 453 // explicitly, because it may require scavenging. 454 cp->pseudo_string_at_put(index, patch()); 455 break; 456 457 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 458 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 459 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 460 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 461 patch_prim: 462 { 463 jvalue value; 464 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 465 guarantee_property(value_type == patch_type, 466 "Illegal primitive patch at %d in class file %s", 467 index, CHECK); 468 switch (value_type) { 469 case T_INT: cp->int_at_put(index, value.i); break; 470 case T_FLOAT: cp->float_at_put(index, value.f); break; 471 case T_LONG: cp->long_at_put(index, value.j); break; 472 case T_DOUBLE: cp->double_at_put(index, value.d); break; 473 default: assert(false, ""); 474 } 475 } 476 break; 477 478 default: 479 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 480 guarantee_property(!has_cp_patch_at(index), 481 "Illegal unexpected patch at %d in class file %s", 482 index, CHECK); 483 return; 484 } 485 486 // On fall-through, mark the patch as used. 487 clear_cp_patch_at(index); 488} 489 490 491 492class NameSigHash: public ResourceObj { 493 public: 494 symbolOop _name; // name 495 symbolOop _sig; // signature 496 NameSigHash* _next; // Next entry in hash table 497}; 498 499 500#define HASH_ROW_SIZE 256 501 502unsigned int hash(symbolOop name, symbolOop sig) { 503 unsigned int raw_hash = 0; 504 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 505 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 506 507 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 508} 509 510 511void initialize_hashtable(NameSigHash** table) { 512 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 513} 514 515// Return false if the name/sig combination is found in table. 516// Return true if no duplicate is found. And name/sig is added as a new entry in table. 517// The old format checker uses heap sort to find duplicates. 518// NOTE: caller should guarantee that GC doesn't happen during the life cycle 519// of table since we don't expect symbolOop's to move. 520bool put_after_lookup(symbolOop name, symbolOop sig, NameSigHash** table) { 521 assert(name != NULL, "name in constant pool is NULL"); 522 523 // First lookup for duplicates 524 int index = hash(name, sig); 525 NameSigHash* entry = table[index]; 526 while (entry != NULL) { 527 if (entry->_name == name && entry->_sig == sig) { 528 return false; 529 } 530 entry = entry->_next; 531 } 532 533 // No duplicate is found, allocate a new entry and fill it. 534 entry = new NameSigHash(); 535 entry->_name = name; 536 entry->_sig = sig; 537 538 // Insert into hash table 539 entry->_next = table[index]; 540 table[index] = entry; 541 542 return true; 543} 544 545 546objArrayHandle ClassFileParser::parse_interfaces(constantPoolHandle cp, 547 int length, 548 Handle class_loader, 549 Handle protection_domain, 550 PerfTraceTime* vmtimer, 551 symbolHandle class_name, 552 TRAPS) { 553 ClassFileStream* cfs = stream(); 554 assert(length > 0, "only called for length>0"); 555 objArrayHandle nullHandle; 556 objArrayOop interface_oop = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 557 objArrayHandle interfaces (THREAD, interface_oop); 558 559 int index; 560 for (index = 0; index < length; index++) { 561 u2 interface_index = cfs->get_u2(CHECK_(nullHandle)); 562 KlassHandle interf; 563 check_property( 564 valid_cp_range(interface_index, cp->length()) && 565 is_klass_reference(cp, interface_index), 566 "Interface name has bad constant pool index %u in class file %s", 567 interface_index, CHECK_(nullHandle)); 568 if (cp->tag_at(interface_index).is_klass()) { 569 interf = KlassHandle(THREAD, cp->resolved_klass_at(interface_index)); 570 } else { 571 symbolHandle unresolved_klass (THREAD, cp->klass_name_at(interface_index)); 572 573 // Don't need to check legal name because it's checked when parsing constant pool. 574 // But need to make sure it's not an array type. 575 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 576 "Bad interface name in class file %s", CHECK_(nullHandle)); 577 578 vmtimer->suspend(); // do not count recursive loading twice 579 // Call resolve_super so classcircularity is checked 580 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 581 unresolved_klass, class_loader, protection_domain, 582 false, CHECK_(nullHandle)); 583 interf = KlassHandle(THREAD, k); 584 vmtimer->resume(); 585 586 if (LinkWellKnownClasses) // my super type is well known to me 587 cp->klass_at_put(interface_index, interf()); // eagerly resolve 588 } 589 590 if (!Klass::cast(interf())->is_interface()) { 591 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", nullHandle); 592 } 593 interfaces->obj_at_put(index, interf()); 594 } 595 596 if (!_need_verify || length <= 1) { 597 return interfaces; 598 } 599 600 // Check if there's any duplicates in interfaces 601 ResourceMark rm(THREAD); 602 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 603 THREAD, NameSigHash*, HASH_ROW_SIZE); 604 initialize_hashtable(interface_names); 605 bool dup = false; 606 { 607 debug_only(No_Safepoint_Verifier nsv;) 608 for (index = 0; index < length; index++) { 609 klassOop k = (klassOop)interfaces->obj_at(index); 610 symbolOop name = instanceKlass::cast(k)->name(); 611 // If no duplicates, add (name, NULL) in hashtable interface_names. 612 if (!put_after_lookup(name, NULL, interface_names)) { 613 dup = true; 614 break; 615 } 616 } 617 } 618 if (dup) { 619 classfile_parse_error("Duplicate interface name in class file %s", 620 CHECK_(nullHandle)); 621 } 622 623 return interfaces; 624} 625 626 627void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, constantPoolHandle cp, TRAPS) { 628 // Make sure the constant pool entry is of a type appropriate to this field 629 guarantee_property( 630 (constantvalue_index > 0 && 631 constantvalue_index < cp->length()), 632 "Bad initial value index %u in ConstantValue attribute in class file %s", 633 constantvalue_index, CHECK); 634 constantTag value_type = cp->tag_at(constantvalue_index); 635 switch ( cp->basic_type_for_signature_at(signature_index) ) { 636 case T_LONG: 637 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 638 break; 639 case T_FLOAT: 640 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 641 break; 642 case T_DOUBLE: 643 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 644 break; 645 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 646 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 647 break; 648 case T_OBJECT: 649 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;", 18) 650 && (value_type.is_string() || value_type.is_unresolved_string())), 651 "Bad string initial value in class file %s", CHECK); 652 break; 653 default: 654 classfile_parse_error( 655 "Unable to set initial value %u in class file %s", 656 constantvalue_index, CHECK); 657 } 658} 659 660 661// Parse attributes for a field. 662void ClassFileParser::parse_field_attributes(constantPoolHandle cp, 663 u2 attributes_count, 664 bool is_static, u2 signature_index, 665 u2* constantvalue_index_addr, 666 bool* is_synthetic_addr, 667 u2* generic_signature_index_addr, 668 typeArrayHandle* field_annotations, 669 TRAPS) { 670 ClassFileStream* cfs = stream(); 671 assert(attributes_count > 0, "length should be greater than 0"); 672 u2 constantvalue_index = 0; 673 u2 generic_signature_index = 0; 674 bool is_synthetic = false; 675 u1* runtime_visible_annotations = NULL; 676 int runtime_visible_annotations_length = 0; 677 u1* runtime_invisible_annotations = NULL; 678 int runtime_invisible_annotations_length = 0; 679 while (attributes_count--) { 680 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 681 u2 attribute_name_index = cfs->get_u2_fast(); 682 u4 attribute_length = cfs->get_u4_fast(); 683 check_property(valid_cp_range(attribute_name_index, cp->length()) && 684 cp->tag_at(attribute_name_index).is_utf8(), 685 "Invalid field attribute index %u in class file %s", 686 attribute_name_index, 687 CHECK); 688 symbolOop attribute_name = cp->symbol_at(attribute_name_index); 689 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 690 // ignore if non-static 691 if (constantvalue_index != 0) { 692 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 693 } 694 check_property( 695 attribute_length == 2, 696 "Invalid ConstantValue field attribute length %u in class file %s", 697 attribute_length, CHECK); 698 constantvalue_index = cfs->get_u2(CHECK); 699 if (_need_verify) { 700 verify_constantvalue(constantvalue_index, signature_index, cp, CHECK); 701 } 702 } else if (attribute_name == vmSymbols::tag_synthetic()) { 703 if (attribute_length != 0) { 704 classfile_parse_error( 705 "Invalid Synthetic field attribute length %u in class file %s", 706 attribute_length, CHECK); 707 } 708 is_synthetic = true; 709 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 710 if (attribute_length != 0) { 711 classfile_parse_error( 712 "Invalid Deprecated field attribute length %u in class file %s", 713 attribute_length, CHECK); 714 } 715 } else if (_major_version >= JAVA_1_5_VERSION) { 716 if (attribute_name == vmSymbols::tag_signature()) { 717 if (attribute_length != 2) { 718 classfile_parse_error( 719 "Wrong size %u for field's Signature attribute in class file %s", 720 attribute_length, CHECK); 721 } 722 generic_signature_index = cfs->get_u2(CHECK); 723 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 724 runtime_visible_annotations_length = attribute_length; 725 runtime_visible_annotations = cfs->get_u1_buffer(); 726 assert(runtime_visible_annotations != NULL, "null visible annotations"); 727 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 728 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 729 runtime_invisible_annotations_length = attribute_length; 730 runtime_invisible_annotations = cfs->get_u1_buffer(); 731 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 732 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 733 } else { 734 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 735 } 736 } else { 737 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 738 } 739 } 740 741 *constantvalue_index_addr = constantvalue_index; 742 *is_synthetic_addr = is_synthetic; 743 *generic_signature_index_addr = generic_signature_index; 744 *field_annotations = assemble_annotations(runtime_visible_annotations, 745 runtime_visible_annotations_length, 746 runtime_invisible_annotations, 747 runtime_invisible_annotations_length, 748 CHECK); 749 return; 750} 751 752 753// Field allocation types. Used for computing field offsets. 754 755enum FieldAllocationType { 756 STATIC_OOP, // Oops 757 STATIC_BYTE, // Boolean, Byte, char 758 STATIC_SHORT, // shorts 759 STATIC_WORD, // ints 760 STATIC_DOUBLE, // long or double 761 STATIC_ALIGNED_DOUBLE,// aligned long or double 762 NONSTATIC_OOP, 763 NONSTATIC_BYTE, 764 NONSTATIC_SHORT, 765 NONSTATIC_WORD, 766 NONSTATIC_DOUBLE, 767 NONSTATIC_ALIGNED_DOUBLE 768}; 769 770 771struct FieldAllocationCount { 772 int static_oop_count; 773 int static_byte_count; 774 int static_short_count; 775 int static_word_count; 776 int static_double_count; 777 int nonstatic_oop_count; 778 int nonstatic_byte_count; 779 int nonstatic_short_count; 780 int nonstatic_word_count; 781 int nonstatic_double_count; 782}; 783 784typeArrayHandle ClassFileParser::parse_fields(constantPoolHandle cp, bool is_interface, 785 struct FieldAllocationCount *fac, 786 objArrayHandle* fields_annotations, TRAPS) { 787 ClassFileStream* cfs = stream(); 788 typeArrayHandle nullHandle; 789 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 790 u2 length = cfs->get_u2_fast(); 791 // Tuples of shorts [access, name index, sig index, initial value index, byte offset, generic signature index] 792 typeArrayOop new_fields = oopFactory::new_permanent_shortArray(length*instanceKlass::next_offset, CHECK_(nullHandle)); 793 typeArrayHandle fields(THREAD, new_fields); 794 795 int index = 0; 796 typeArrayHandle field_annotations; 797 for (int n = 0; n < length; n++) { 798 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 799 800 AccessFlags access_flags; 801 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 802 verify_legal_field_modifiers(flags, is_interface, CHECK_(nullHandle)); 803 access_flags.set_flags(flags); 804 805 u2 name_index = cfs->get_u2_fast(); 806 int cp_size = cp->length(); 807 check_property( 808 valid_cp_range(name_index, cp_size) && cp->tag_at(name_index).is_utf8(), 809 "Invalid constant pool index %u for field name in class file %s", 810 name_index, CHECK_(nullHandle)); 811 symbolHandle name(THREAD, cp->symbol_at(name_index)); 812 verify_legal_field_name(name, CHECK_(nullHandle)); 813 814 u2 signature_index = cfs->get_u2_fast(); 815 check_property( 816 valid_cp_range(signature_index, cp_size) && 817 cp->tag_at(signature_index).is_utf8(), 818 "Invalid constant pool index %u for field signature in class file %s", 819 signature_index, CHECK_(nullHandle)); 820 symbolHandle sig(THREAD, cp->symbol_at(signature_index)); 821 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 822 823 u2 constantvalue_index = 0; 824 bool is_synthetic = false; 825 u2 generic_signature_index = 0; 826 bool is_static = access_flags.is_static(); 827 828 u2 attributes_count = cfs->get_u2_fast(); 829 if (attributes_count > 0) { 830 parse_field_attributes(cp, attributes_count, is_static, signature_index, 831 &constantvalue_index, &is_synthetic, 832 &generic_signature_index, &field_annotations, 833 CHECK_(nullHandle)); 834 if (field_annotations.not_null()) { 835 if (fields_annotations->is_null()) { 836 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 837 *fields_annotations = objArrayHandle(THREAD, md); 838 } 839 (*fields_annotations)->obj_at_put(n, field_annotations()); 840 } 841 if (is_synthetic) { 842 access_flags.set_is_synthetic(); 843 } 844 } 845 846 fields->short_at_put(index++, access_flags.as_short()); 847 fields->short_at_put(index++, name_index); 848 fields->short_at_put(index++, signature_index); 849 fields->short_at_put(index++, constantvalue_index); 850 851 // Remember how many oops we encountered and compute allocation type 852 BasicType type = cp->basic_type_for_signature_at(signature_index); 853 FieldAllocationType atype; 854 if ( is_static ) { 855 switch ( type ) { 856 case T_BOOLEAN: 857 case T_BYTE: 858 fac->static_byte_count++; 859 atype = STATIC_BYTE; 860 break; 861 case T_LONG: 862 case T_DOUBLE: 863 if (Universe::field_type_should_be_aligned(type)) { 864 atype = STATIC_ALIGNED_DOUBLE; 865 } else { 866 atype = STATIC_DOUBLE; 867 } 868 fac->static_double_count++; 869 break; 870 case T_CHAR: 871 case T_SHORT: 872 fac->static_short_count++; 873 atype = STATIC_SHORT; 874 break; 875 case T_FLOAT: 876 case T_INT: 877 fac->static_word_count++; 878 atype = STATIC_WORD; 879 break; 880 case T_ARRAY: 881 case T_OBJECT: 882 fac->static_oop_count++; 883 atype = STATIC_OOP; 884 break; 885 case T_ADDRESS: 886 case T_VOID: 887 default: 888 assert(0, "bad field type"); 889 } 890 } else { 891 switch ( type ) { 892 case T_BOOLEAN: 893 case T_BYTE: 894 fac->nonstatic_byte_count++; 895 atype = NONSTATIC_BYTE; 896 break; 897 case T_LONG: 898 case T_DOUBLE: 899 if (Universe::field_type_should_be_aligned(type)) { 900 atype = NONSTATIC_ALIGNED_DOUBLE; 901 } else { 902 atype = NONSTATIC_DOUBLE; 903 } 904 fac->nonstatic_double_count++; 905 break; 906 case T_CHAR: 907 case T_SHORT: 908 fac->nonstatic_short_count++; 909 atype = NONSTATIC_SHORT; 910 break; 911 case T_FLOAT: 912 case T_INT: 913 fac->nonstatic_word_count++; 914 atype = NONSTATIC_WORD; 915 break; 916 case T_ARRAY: 917 case T_OBJECT: 918 fac->nonstatic_oop_count++; 919 atype = NONSTATIC_OOP; 920 break; 921 case T_ADDRESS: 922 case T_VOID: 923 default: 924 assert(0, "bad field type"); 925 } 926 } 927 928 // The correct offset is computed later (all oop fields will be located together) 929 // We temporarily store the allocation type in the offset field 930 fields->short_at_put(index++, atype); 931 fields->short_at_put(index++, 0); // Clear out high word of byte offset 932 fields->short_at_put(index++, generic_signature_index); 933 } 934 935 if (_need_verify && length > 1) { 936 // Check duplicated fields 937 ResourceMark rm(THREAD); 938 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 939 THREAD, NameSigHash*, HASH_ROW_SIZE); 940 initialize_hashtable(names_and_sigs); 941 bool dup = false; 942 { 943 debug_only(No_Safepoint_Verifier nsv;) 944 for (int i = 0; i < length*instanceKlass::next_offset; i += instanceKlass::next_offset) { 945 int name_index = fields->ushort_at(i + instanceKlass::name_index_offset); 946 symbolOop name = cp->symbol_at(name_index); 947 int sig_index = fields->ushort_at(i + instanceKlass::signature_index_offset); 948 symbolOop sig = cp->symbol_at(sig_index); 949 // If no duplicates, add name/signature in hashtable names_and_sigs. 950 if (!put_after_lookup(name, sig, names_and_sigs)) { 951 dup = true; 952 break; 953 } 954 } 955 } 956 if (dup) { 957 classfile_parse_error("Duplicate field name&signature in class file %s", 958 CHECK_(nullHandle)); 959 } 960 } 961 962 return fields; 963} 964 965 966static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 967 while (length-- > 0) { 968 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 969 } 970} 971 972 973typeArrayHandle ClassFileParser::parse_exception_table(u4 code_length, 974 u4 exception_table_length, 975 constantPoolHandle cp, 976 TRAPS) { 977 ClassFileStream* cfs = stream(); 978 typeArrayHandle nullHandle; 979 980 // 4-tuples of ints [start_pc, end_pc, handler_pc, catch_type index] 981 typeArrayOop eh = oopFactory::new_permanent_intArray(exception_table_length*4, CHECK_(nullHandle)); 982 typeArrayHandle exception_handlers = typeArrayHandle(THREAD, eh); 983 984 int index = 0; 985 cfs->guarantee_more(8 * exception_table_length, CHECK_(nullHandle)); // start_pc, end_pc, handler_pc, catch_type_index 986 for (unsigned int i = 0; i < exception_table_length; i++) { 987 u2 start_pc = cfs->get_u2_fast(); 988 u2 end_pc = cfs->get_u2_fast(); 989 u2 handler_pc = cfs->get_u2_fast(); 990 u2 catch_type_index = cfs->get_u2_fast(); 991 // Will check legal target after parsing code array in verifier. 992 if (_need_verify) { 993 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 994 "Illegal exception table range in class file %s", CHECK_(nullHandle)); 995 guarantee_property(handler_pc < code_length, 996 "Illegal exception table handler in class file %s", CHECK_(nullHandle)); 997 if (catch_type_index != 0) { 998 guarantee_property(valid_cp_range(catch_type_index, cp->length()) && 999 is_klass_reference(cp, catch_type_index), 1000 "Catch type in exception table has bad constant type in class file %s", CHECK_(nullHandle)); 1001 } 1002 } 1003 exception_handlers->int_at_put(index++, start_pc); 1004 exception_handlers->int_at_put(index++, end_pc); 1005 exception_handlers->int_at_put(index++, handler_pc); 1006 exception_handlers->int_at_put(index++, catch_type_index); 1007 } 1008 return exception_handlers; 1009} 1010 1011void ClassFileParser::parse_linenumber_table( 1012 u4 code_attribute_length, u4 code_length, 1013 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1014 ClassFileStream* cfs = stream(); 1015 unsigned int num_entries = cfs->get_u2(CHECK); 1016 1017 // Each entry is a u2 start_pc, and a u2 line_number 1018 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1019 1020 // Verify line number attribute and table length 1021 check_property( 1022 code_attribute_length == sizeof(u2) + length_in_bytes, 1023 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1024 1025 cfs->guarantee_more(length_in_bytes, CHECK); 1026 1027 if ((*write_stream) == NULL) { 1028 if (length_in_bytes > fixed_buffer_size) { 1029 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1030 } else { 1031 (*write_stream) = new CompressedLineNumberWriteStream( 1032 linenumbertable_buffer, fixed_buffer_size); 1033 } 1034 } 1035 1036 while (num_entries-- > 0) { 1037 u2 bci = cfs->get_u2_fast(); // start_pc 1038 u2 line = cfs->get_u2_fast(); // line_number 1039 guarantee_property(bci < code_length, 1040 "Invalid pc in LineNumberTable in class file %s", CHECK); 1041 (*write_stream)->write_pair(bci, line); 1042 } 1043} 1044 1045 1046// Class file LocalVariableTable elements. 1047class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1048 public: 1049 u2 start_bci; 1050 u2 length; 1051 u2 name_cp_index; 1052 u2 descriptor_cp_index; 1053 u2 slot; 1054}; 1055 1056 1057class LVT_Hash: public CHeapObj { 1058 public: 1059 LocalVariableTableElement *_elem; // element 1060 LVT_Hash* _next; // Next entry in hash table 1061}; 1062 1063unsigned int hash(LocalVariableTableElement *elem) { 1064 unsigned int raw_hash = elem->start_bci; 1065 1066 raw_hash = elem->length + raw_hash * 37; 1067 raw_hash = elem->name_cp_index + raw_hash * 37; 1068 raw_hash = elem->slot + raw_hash * 37; 1069 1070 return raw_hash % HASH_ROW_SIZE; 1071} 1072 1073void initialize_hashtable(LVT_Hash** table) { 1074 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1075 table[i] = NULL; 1076 } 1077} 1078 1079void clear_hashtable(LVT_Hash** table) { 1080 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1081 LVT_Hash* current = table[i]; 1082 LVT_Hash* next; 1083 while (current != NULL) { 1084 next = current->_next; 1085 current->_next = NULL; 1086 delete(current); 1087 current = next; 1088 } 1089 table[i] = NULL; 1090 } 1091} 1092 1093LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1094 LVT_Hash* entry = table[index]; 1095 1096 /* 1097 * 3-tuple start_bci/length/slot has to be unique key, 1098 * so the following comparison seems to be redundant: 1099 * && elem->name_cp_index == entry->_elem->name_cp_index 1100 */ 1101 while (entry != NULL) { 1102 if (elem->start_bci == entry->_elem->start_bci 1103 && elem->length == entry->_elem->length 1104 && elem->name_cp_index == entry->_elem->name_cp_index 1105 && elem->slot == entry->_elem->slot 1106 ) { 1107 return entry; 1108 } 1109 entry = entry->_next; 1110 } 1111 return NULL; 1112} 1113 1114// Return false if the local variable is found in table. 1115// Return true if no duplicate is found. 1116// And local variable is added as a new entry in table. 1117bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1118 // First lookup for duplicates 1119 int index = hash(elem); 1120 LVT_Hash* entry = LVT_lookup(elem, index, table); 1121 1122 if (entry != NULL) { 1123 return false; 1124 } 1125 // No duplicate is found, allocate a new entry and fill it. 1126 if ((entry = new LVT_Hash()) == NULL) { 1127 return false; 1128 } 1129 entry->_elem = elem; 1130 1131 // Insert into hash table 1132 entry->_next = table[index]; 1133 table[index] = entry; 1134 1135 return true; 1136} 1137 1138void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1139 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1140 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1141 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1142 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1143 lvt->signature_cp_index = 0; 1144 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1145} 1146 1147// Function is used to parse both attributes: 1148// LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1149u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1150 u2 max_locals, 1151 u4 code_attribute_length, 1152 constantPoolHandle cp, 1153 u2* localvariable_table_length, 1154 bool isLVTT, 1155 TRAPS) { 1156 ClassFileStream* cfs = stream(); 1157 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1158 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1159 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1160 // Verify local variable table attribute has right length 1161 if (_need_verify) { 1162 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1163 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1164 } 1165 u2* localvariable_table_start = cfs->get_u2_buffer(); 1166 assert(localvariable_table_start != NULL, "null local variable table"); 1167 if (!_need_verify) { 1168 cfs->skip_u2_fast(size); 1169 } else { 1170 cfs->guarantee_more(size * 2, CHECK_NULL); 1171 for(int i = 0; i < (*localvariable_table_length); i++) { 1172 u2 start_pc = cfs->get_u2_fast(); 1173 u2 length = cfs->get_u2_fast(); 1174 u2 name_index = cfs->get_u2_fast(); 1175 u2 descriptor_index = cfs->get_u2_fast(); 1176 u2 index = cfs->get_u2_fast(); 1177 // Assign to a u4 to avoid overflow 1178 u4 end_pc = (u4)start_pc + (u4)length; 1179 1180 if (start_pc >= code_length) { 1181 classfile_parse_error( 1182 "Invalid start_pc %u in %s in class file %s", 1183 start_pc, tbl_name, CHECK_NULL); 1184 } 1185 if (end_pc > code_length) { 1186 classfile_parse_error( 1187 "Invalid length %u in %s in class file %s", 1188 length, tbl_name, CHECK_NULL); 1189 } 1190 int cp_size = cp->length(); 1191 guarantee_property( 1192 valid_cp_range(name_index, cp_size) && 1193 cp->tag_at(name_index).is_utf8(), 1194 "Name index %u in %s has bad constant type in class file %s", 1195 name_index, tbl_name, CHECK_NULL); 1196 guarantee_property( 1197 valid_cp_range(descriptor_index, cp_size) && 1198 cp->tag_at(descriptor_index).is_utf8(), 1199 "Signature index %u in %s has bad constant type in class file %s", 1200 descriptor_index, tbl_name, CHECK_NULL); 1201 1202 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1203 symbolHandle sig(THREAD, cp->symbol_at(descriptor_index)); 1204 verify_legal_field_name(name, CHECK_NULL); 1205 u2 extra_slot = 0; 1206 if (!isLVTT) { 1207 verify_legal_field_signature(name, sig, CHECK_NULL); 1208 1209 // 4894874: check special cases for double and long local variables 1210 if (sig() == vmSymbols::type_signature(T_DOUBLE) || 1211 sig() == vmSymbols::type_signature(T_LONG)) { 1212 extra_slot = 1; 1213 } 1214 } 1215 guarantee_property((index + extra_slot) < max_locals, 1216 "Invalid index %u in %s in class file %s", 1217 index, tbl_name, CHECK_NULL); 1218 } 1219 } 1220 return localvariable_table_start; 1221} 1222 1223 1224void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1225 u1* u1_array, u2* u2_array, constantPoolHandle cp, TRAPS) { 1226 ClassFileStream* cfs = stream(); 1227 u2 index = 0; // index in the array with long/double occupying two slots 1228 u4 i1 = *u1_index; 1229 u4 i2 = *u2_index + 1; 1230 for(int i = 0; i < array_length; i++) { 1231 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1232 index++; 1233 if (tag == ITEM_Long || tag == ITEM_Double) { 1234 index++; 1235 } else if (tag == ITEM_Object) { 1236 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1237 guarantee_property(valid_cp_range(class_index, cp->length()) && 1238 is_klass_reference(cp, class_index), 1239 "Bad class index %u in StackMap in class file %s", 1240 class_index, CHECK); 1241 } else if (tag == ITEM_Uninitialized) { 1242 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1243 guarantee_property( 1244 offset < code_length, 1245 "Bad uninitialized type offset %u in StackMap in class file %s", 1246 offset, CHECK); 1247 } else { 1248 guarantee_property( 1249 tag <= (u1)ITEM_Uninitialized, 1250 "Unknown variable type %u in StackMap in class file %s", 1251 tag, CHECK); 1252 } 1253 } 1254 u2_array[*u2_index] = index; 1255 *u1_index = i1; 1256 *u2_index = i2; 1257} 1258 1259typeArrayOop ClassFileParser::parse_stackmap_table( 1260 u4 code_attribute_length, TRAPS) { 1261 if (code_attribute_length == 0) 1262 return NULL; 1263 1264 ClassFileStream* cfs = stream(); 1265 u1* stackmap_table_start = cfs->get_u1_buffer(); 1266 assert(stackmap_table_start != NULL, "null stackmap table"); 1267 1268 // check code_attribute_length first 1269 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1270 1271 if (!_need_verify && !DumpSharedSpaces) { 1272 return NULL; 1273 } 1274 1275 typeArrayOop stackmap_data = 1276 oopFactory::new_permanent_byteArray(code_attribute_length, CHECK_NULL); 1277 1278 stackmap_data->set_length(code_attribute_length); 1279 memcpy((void*)stackmap_data->byte_at_addr(0), 1280 (void*)stackmap_table_start, code_attribute_length); 1281 return stackmap_data; 1282} 1283 1284u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1285 u4 method_attribute_length, 1286 constantPoolHandle cp, TRAPS) { 1287 ClassFileStream* cfs = stream(); 1288 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1289 *checked_exceptions_length = cfs->get_u2_fast(); 1290 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1291 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1292 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1293 if (!_need_verify) { 1294 cfs->skip_u2_fast(size); 1295 } else { 1296 // Verify each value in the checked exception table 1297 u2 checked_exception; 1298 u2 len = *checked_exceptions_length; 1299 cfs->guarantee_more(2 * len, CHECK_NULL); 1300 for (int i = 0; i < len; i++) { 1301 checked_exception = cfs->get_u2_fast(); 1302 check_property( 1303 valid_cp_range(checked_exception, cp->length()) && 1304 is_klass_reference(cp, checked_exception), 1305 "Exception name has bad type at constant pool %u in class file %s", 1306 checked_exception, CHECK_NULL); 1307 } 1308 } 1309 // check exceptions attribute length 1310 if (_need_verify) { 1311 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1312 sizeof(u2) * size), 1313 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1314 } 1315 return checked_exceptions_start; 1316} 1317 1318 1319#define MAX_ARGS_SIZE 255 1320#define MAX_CODE_SIZE 65535 1321#define INITIAL_MAX_LVT_NUMBER 256 1322 1323// Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1324// attribute is inlined. This is curbersome to avoid since we inline most of the parts in the 1325// methodOop to save footprint, so we only know the size of the resulting methodOop when the 1326// entire method attribute is parsed. 1327// 1328// The promoted_flags parameter is used to pass relevant access_flags 1329// from the method back up to the containing klass. These flag values 1330// are added to klass's access_flags. 1331 1332methodHandle ClassFileParser::parse_method(constantPoolHandle cp, bool is_interface, 1333 AccessFlags *promoted_flags, 1334 typeArrayHandle* method_annotations, 1335 typeArrayHandle* method_parameter_annotations, 1336 typeArrayHandle* method_default_annotations, 1337 TRAPS) { 1338 ClassFileStream* cfs = stream(); 1339 methodHandle nullHandle; 1340 ResourceMark rm(THREAD); 1341 // Parse fixed parts 1342 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1343 1344 int flags = cfs->get_u2_fast(); 1345 u2 name_index = cfs->get_u2_fast(); 1346 int cp_size = cp->length(); 1347 check_property( 1348 valid_cp_range(name_index, cp_size) && 1349 cp->tag_at(name_index).is_utf8(), 1350 "Illegal constant pool index %u for method name in class file %s", 1351 name_index, CHECK_(nullHandle)); 1352 symbolHandle name(THREAD, cp->symbol_at(name_index)); 1353 verify_legal_method_name(name, CHECK_(nullHandle)); 1354 1355 u2 signature_index = cfs->get_u2_fast(); 1356 guarantee_property( 1357 valid_cp_range(signature_index, cp_size) && 1358 cp->tag_at(signature_index).is_utf8(), 1359 "Illegal constant pool index %u for method signature in class file %s", 1360 signature_index, CHECK_(nullHandle)); 1361 symbolHandle signature(THREAD, cp->symbol_at(signature_index)); 1362 1363 AccessFlags access_flags; 1364 if (name == vmSymbols::class_initializer_name()) { 1365 // We ignore the access flags for a class initializer. (JVM Spec. p. 116) 1366 flags = JVM_ACC_STATIC; 1367 } else { 1368 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 1369 } 1370 1371 int args_size = -1; // only used when _need_verify is true 1372 if (_need_verify) { 1373 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 1374 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 1375 if (args_size > MAX_ARGS_SIZE) { 1376 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 1377 } 1378 } 1379 1380 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 1381 1382 // Default values for code and exceptions attribute elements 1383 u2 max_stack = 0; 1384 u2 max_locals = 0; 1385 u4 code_length = 0; 1386 u1* code_start = 0; 1387 u2 exception_table_length = 0; 1388 typeArrayHandle exception_handlers(THREAD, Universe::the_empty_int_array()); 1389 u2 checked_exceptions_length = 0; 1390 u2* checked_exceptions_start = NULL; 1391 CompressedLineNumberWriteStream* linenumber_table = NULL; 1392 int linenumber_table_length = 0; 1393 int total_lvt_length = 0; 1394 u2 lvt_cnt = 0; 1395 u2 lvtt_cnt = 0; 1396 bool lvt_allocated = false; 1397 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 1398 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 1399 u2* localvariable_table_length; 1400 u2** localvariable_table_start; 1401 u2* localvariable_type_table_length; 1402 u2** localvariable_type_table_start; 1403 bool parsed_code_attribute = false; 1404 bool parsed_checked_exceptions_attribute = false; 1405 bool parsed_stackmap_attribute = false; 1406 // stackmap attribute - JDK1.5 1407 typeArrayHandle stackmap_data; 1408 u2 generic_signature_index = 0; 1409 u1* runtime_visible_annotations = NULL; 1410 int runtime_visible_annotations_length = 0; 1411 u1* runtime_invisible_annotations = NULL; 1412 int runtime_invisible_annotations_length = 0; 1413 u1* runtime_visible_parameter_annotations = NULL; 1414 int runtime_visible_parameter_annotations_length = 0; 1415 u1* runtime_invisible_parameter_annotations = NULL; 1416 int runtime_invisible_parameter_annotations_length = 0; 1417 u1* annotation_default = NULL; 1418 int annotation_default_length = 0; 1419 1420 // Parse code and exceptions attribute 1421 u2 method_attributes_count = cfs->get_u2_fast(); 1422 while (method_attributes_count--) { 1423 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 1424 u2 method_attribute_name_index = cfs->get_u2_fast(); 1425 u4 method_attribute_length = cfs->get_u4_fast(); 1426 check_property( 1427 valid_cp_range(method_attribute_name_index, cp_size) && 1428 cp->tag_at(method_attribute_name_index).is_utf8(), 1429 "Invalid method attribute name index %u in class file %s", 1430 method_attribute_name_index, CHECK_(nullHandle)); 1431 1432 symbolOop method_attribute_name = cp->symbol_at(method_attribute_name_index); 1433 if (method_attribute_name == vmSymbols::tag_code()) { 1434 // Parse Code attribute 1435 if (_need_verify) { 1436 guarantee_property(!access_flags.is_native() && !access_flags.is_abstract(), 1437 "Code attribute in native or abstract methods in class file %s", 1438 CHECK_(nullHandle)); 1439 } 1440 if (parsed_code_attribute) { 1441 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 1442 } 1443 parsed_code_attribute = true; 1444 1445 // Stack size, locals size, and code size 1446 if (_major_version == 45 && _minor_version <= 2) { 1447 cfs->guarantee_more(4, CHECK_(nullHandle)); 1448 max_stack = cfs->get_u1_fast(); 1449 max_locals = cfs->get_u1_fast(); 1450 code_length = cfs->get_u2_fast(); 1451 } else { 1452 cfs->guarantee_more(8, CHECK_(nullHandle)); 1453 max_stack = cfs->get_u2_fast(); 1454 max_locals = cfs->get_u2_fast(); 1455 code_length = cfs->get_u4_fast(); 1456 } 1457 if (_need_verify) { 1458 guarantee_property(args_size <= max_locals, 1459 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 1460 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 1461 "Invalid method Code length %u in class file %s", 1462 code_length, CHECK_(nullHandle)); 1463 } 1464 // Code pointer 1465 code_start = cfs->get_u1_buffer(); 1466 assert(code_start != NULL, "null code start"); 1467 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 1468 cfs->skip_u1_fast(code_length); 1469 1470 // Exception handler table 1471 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 1472 exception_table_length = cfs->get_u2_fast(); 1473 if (exception_table_length > 0) { 1474 exception_handlers = 1475 parse_exception_table(code_length, exception_table_length, cp, CHECK_(nullHandle)); 1476 } 1477 1478 // Parse additional attributes in code attribute 1479 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 1480 u2 code_attributes_count = cfs->get_u2_fast(); 1481 1482 unsigned int calculated_attribute_length = 0; 1483 1484 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 1485 calculated_attribute_length = 1486 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 1487 } else { 1488 // max_stack, locals and length are smaller in pre-version 45.2 classes 1489 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 1490 } 1491 calculated_attribute_length += 1492 code_length + 1493 sizeof(exception_table_length) + 1494 sizeof(code_attributes_count) + 1495 exception_table_length * 1496 ( sizeof(u2) + // start_pc 1497 sizeof(u2) + // end_pc 1498 sizeof(u2) + // handler_pc 1499 sizeof(u2) ); // catch_type_index 1500 1501 while (code_attributes_count--) { 1502 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 1503 u2 code_attribute_name_index = cfs->get_u2_fast(); 1504 u4 code_attribute_length = cfs->get_u4_fast(); 1505 calculated_attribute_length += code_attribute_length + 1506 sizeof(code_attribute_name_index) + 1507 sizeof(code_attribute_length); 1508 check_property(valid_cp_range(code_attribute_name_index, cp_size) && 1509 cp->tag_at(code_attribute_name_index).is_utf8(), 1510 "Invalid code attribute name index %u in class file %s", 1511 code_attribute_name_index, 1512 CHECK_(nullHandle)); 1513 if (LoadLineNumberTables && 1514 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 1515 // Parse and compress line number table 1516 parse_linenumber_table(code_attribute_length, code_length, 1517 &linenumber_table, CHECK_(nullHandle)); 1518 1519 } else if (LoadLocalVariableTables && 1520 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 1521 // Parse local variable table 1522 if (!lvt_allocated) { 1523 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1524 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1525 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1526 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1527 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1528 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1529 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1530 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1531 lvt_allocated = true; 1532 } 1533 if (lvt_cnt == max_lvt_cnt) { 1534 max_lvt_cnt <<= 1; 1535 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 1536 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 1537 } 1538 localvariable_table_start[lvt_cnt] = 1539 parse_localvariable_table(code_length, 1540 max_locals, 1541 code_attribute_length, 1542 cp, 1543 &localvariable_table_length[lvt_cnt], 1544 false, // is not LVTT 1545 CHECK_(nullHandle)); 1546 total_lvt_length += localvariable_table_length[lvt_cnt]; 1547 lvt_cnt++; 1548 } else if (LoadLocalVariableTypeTables && 1549 _major_version >= JAVA_1_5_VERSION && 1550 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 1551 if (!lvt_allocated) { 1552 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1553 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1554 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1555 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1556 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 1557 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 1558 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 1559 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 1560 lvt_allocated = true; 1561 } 1562 // Parse local variable type table 1563 if (lvtt_cnt == max_lvtt_cnt) { 1564 max_lvtt_cnt <<= 1; 1565 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 1566 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 1567 } 1568 localvariable_type_table_start[lvtt_cnt] = 1569 parse_localvariable_table(code_length, 1570 max_locals, 1571 code_attribute_length, 1572 cp, 1573 &localvariable_type_table_length[lvtt_cnt], 1574 true, // is LVTT 1575 CHECK_(nullHandle)); 1576 lvtt_cnt++; 1577 } else if (UseSplitVerifier && 1578 _major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 1579 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 1580 // Stack map is only needed by the new verifier in JDK1.5. 1581 if (parsed_stackmap_attribute) { 1582 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 1583 } 1584 typeArrayOop sm = 1585 parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 1586 stackmap_data = typeArrayHandle(THREAD, sm); 1587 parsed_stackmap_attribute = true; 1588 } else { 1589 // Skip unknown attributes 1590 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 1591 } 1592 } 1593 // check method attribute length 1594 if (_need_verify) { 1595 guarantee_property(method_attribute_length == calculated_attribute_length, 1596 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 1597 } 1598 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 1599 // Parse Exceptions attribute 1600 if (parsed_checked_exceptions_attribute) { 1601 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 1602 } 1603 parsed_checked_exceptions_attribute = true; 1604 checked_exceptions_start = 1605 parse_checked_exceptions(&checked_exceptions_length, 1606 method_attribute_length, 1607 cp, CHECK_(nullHandle)); 1608 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 1609 if (method_attribute_length != 0) { 1610 classfile_parse_error( 1611 "Invalid Synthetic method attribute length %u in class file %s", 1612 method_attribute_length, CHECK_(nullHandle)); 1613 } 1614 // Should we check that there hasn't already been a synthetic attribute? 1615 access_flags.set_is_synthetic(); 1616 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1617 if (method_attribute_length != 0) { 1618 classfile_parse_error( 1619 "Invalid Deprecated method attribute length %u in class file %s", 1620 method_attribute_length, CHECK_(nullHandle)); 1621 } 1622 } else if (_major_version >= JAVA_1_5_VERSION) { 1623 if (method_attribute_name == vmSymbols::tag_signature()) { 1624 if (method_attribute_length != 2) { 1625 classfile_parse_error( 1626 "Invalid Signature attribute length %u in class file %s", 1627 method_attribute_length, CHECK_(nullHandle)); 1628 } 1629 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 1630 generic_signature_index = cfs->get_u2_fast(); 1631 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1632 runtime_visible_annotations_length = method_attribute_length; 1633 runtime_visible_annotations = cfs->get_u1_buffer(); 1634 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1635 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 1636 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1637 runtime_invisible_annotations_length = method_attribute_length; 1638 runtime_invisible_annotations = cfs->get_u1_buffer(); 1639 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1640 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 1641 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 1642 runtime_visible_parameter_annotations_length = method_attribute_length; 1643 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 1644 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 1645 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 1646 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 1647 runtime_invisible_parameter_annotations_length = method_attribute_length; 1648 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 1649 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 1650 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 1651 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 1652 annotation_default_length = method_attribute_length; 1653 annotation_default = cfs->get_u1_buffer(); 1654 assert(annotation_default != NULL, "null annotation default"); 1655 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 1656 } else { 1657 // Skip unknown attributes 1658 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1659 } 1660 } else { 1661 // Skip unknown attributes 1662 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 1663 } 1664 } 1665 1666 if (linenumber_table != NULL) { 1667 linenumber_table->write_terminator(); 1668 linenumber_table_length = linenumber_table->position(); 1669 } 1670 1671 // Make sure there's at least one Code attribute in non-native/non-abstract method 1672 if (_need_verify) { 1673 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 1674 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 1675 } 1676 1677 // All sizing information for a methodOop is finally available, now create it 1678 methodOop m_oop = oopFactory::new_method( 1679 code_length, access_flags, linenumber_table_length, 1680 total_lvt_length, checked_exceptions_length, 1681 methodOopDesc::IsSafeConc, CHECK_(nullHandle)); 1682 methodHandle m (THREAD, m_oop); 1683 1684 ClassLoadingService::add_class_method_size(m_oop->size()*HeapWordSize); 1685 1686 // Fill in information from fixed part (access_flags already set) 1687 m->set_constants(cp()); 1688 m->set_name_index(name_index); 1689 m->set_signature_index(signature_index); 1690 m->set_generic_signature_index(generic_signature_index); 1691#ifdef CC_INTERP 1692 // hmm is there a gc issue here?? 1693 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 1694 m->set_result_index(rtf.type()); 1695#endif 1696 1697 if (args_size >= 0) { 1698 m->set_size_of_parameters(args_size); 1699 } else { 1700 m->compute_size_of_parameters(THREAD); 1701 } 1702#ifdef ASSERT 1703 if (args_size >= 0) { 1704 m->compute_size_of_parameters(THREAD); 1705 assert(args_size == m->size_of_parameters(), ""); 1706 } 1707#endif 1708 1709 // Fill in code attribute information 1710 m->set_max_stack(max_stack); 1711 m->set_max_locals(max_locals); 1712 m->constMethod()->set_stackmap_data(stackmap_data()); 1713 1714 /** 1715 * The exception_table field is the flag used to indicate 1716 * that the methodOop and it's associated constMethodOop are partially 1717 * initialized and thus are exempt from pre/post GC verification. Once 1718 * the field is set, the oops are considered fully initialized so make 1719 * sure that the oops can pass verification when this field is set. 1720 */ 1721 m->set_exception_table(exception_handlers()); 1722 1723 // Copy byte codes 1724 if (code_length > 0) { 1725 memcpy(m->code_base(), code_start, code_length); 1726 } 1727 1728 // Copy line number table 1729 if (linenumber_table != NULL) { 1730 memcpy(m->compressed_linenumber_table(), 1731 linenumber_table->buffer(), linenumber_table_length); 1732 } 1733 1734 // Copy checked exceptions 1735 if (checked_exceptions_length > 0) { 1736 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 1737 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 1738 } 1739 1740 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1741 * 1742 * Rules for LVT's and LVTT's are: 1743 * - There can be any number of LVT's and LVTT's. 1744 * - If there are n LVT's, it is the same as if there was just 1745 * one LVT containing all the entries from the n LVT's. 1746 * - There may be no more than one LVT entry per local variable. 1747 * Two LVT entries are 'equal' if these fields are the same: 1748 * start_pc, length, name, slot 1749 * - There may be no more than one LVTT entry per each LVT entry. 1750 * Each LVTT entry has to match some LVT entry. 1751 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1752 */ 1753 if (total_lvt_length > 0) { 1754 int tbl_no, idx; 1755 1756 promoted_flags->set_has_localvariable_table(); 1757 1758 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1759 initialize_hashtable(lvt_Hash); 1760 1761 // To fill LocalVariableTable in 1762 Classfile_LVT_Element* cf_lvt; 1763 LocalVariableTableElement* lvt = m->localvariable_table_start(); 1764 1765 for (tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1766 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1767 for (idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1768 copy_lvt_element(&cf_lvt[idx], lvt); 1769 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1770 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1771 && _need_verify 1772 && _major_version >= JAVA_1_5_VERSION ) { 1773 clear_hashtable(lvt_Hash); 1774 classfile_parse_error("Duplicated LocalVariableTable attribute " 1775 "entry for '%s' in class file %s", 1776 cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1777 CHECK_(nullHandle)); 1778 } 1779 } 1780 } 1781 1782 // To merge LocalVariableTable and LocalVariableTypeTable 1783 Classfile_LVT_Element* cf_lvtt; 1784 LocalVariableTableElement lvtt_elem; 1785 1786 for (tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1787 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1788 for (idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1789 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1790 int index = hash(&lvtt_elem); 1791 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1792 if (entry == NULL) { 1793 if (_need_verify) { 1794 clear_hashtable(lvt_Hash); 1795 classfile_parse_error("LVTT entry for '%s' in class file %s " 1796 "does not match any LVT entry", 1797 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1798 CHECK_(nullHandle)); 1799 } 1800 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1801 clear_hashtable(lvt_Hash); 1802 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1803 "entry for '%s' in class file %s", 1804 cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1805 CHECK_(nullHandle)); 1806 } else { 1807 // to add generic signatures into LocalVariableTable 1808 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1809 } 1810 } 1811 } 1812 clear_hashtable(lvt_Hash); 1813 } 1814 1815 *method_annotations = assemble_annotations(runtime_visible_annotations, 1816 runtime_visible_annotations_length, 1817 runtime_invisible_annotations, 1818 runtime_invisible_annotations_length, 1819 CHECK_(nullHandle)); 1820 *method_parameter_annotations = assemble_annotations(runtime_visible_parameter_annotations, 1821 runtime_visible_parameter_annotations_length, 1822 runtime_invisible_parameter_annotations, 1823 runtime_invisible_parameter_annotations_length, 1824 CHECK_(nullHandle)); 1825 *method_default_annotations = assemble_annotations(annotation_default, 1826 annotation_default_length, 1827 NULL, 1828 0, 1829 CHECK_(nullHandle)); 1830 1831 if (name() == vmSymbols::finalize_method_name() && 1832 signature() == vmSymbols::void_method_signature()) { 1833 if (m->is_empty_method()) { 1834 _has_empty_finalizer = true; 1835 } else { 1836 _has_finalizer = true; 1837 } 1838 } 1839 if (name() == vmSymbols::object_initializer_name() && 1840 signature() == vmSymbols::void_method_signature() && 1841 m->is_vanilla_constructor()) { 1842 _has_vanilla_constructor = true; 1843 } 1844 1845 return m; 1846} 1847 1848 1849// The promoted_flags parameter is used to pass relevant access_flags 1850// from the methods back up to the containing klass. These flag values 1851// are added to klass's access_flags. 1852 1853objArrayHandle ClassFileParser::parse_methods(constantPoolHandle cp, bool is_interface, 1854 AccessFlags* promoted_flags, 1855 bool* has_final_method, 1856 objArrayOop* methods_annotations_oop, 1857 objArrayOop* methods_parameter_annotations_oop, 1858 objArrayOop* methods_default_annotations_oop, 1859 TRAPS) { 1860 ClassFileStream* cfs = stream(); 1861 objArrayHandle nullHandle; 1862 typeArrayHandle method_annotations; 1863 typeArrayHandle method_parameter_annotations; 1864 typeArrayHandle method_default_annotations; 1865 cfs->guarantee_more(2, CHECK_(nullHandle)); // length 1866 u2 length = cfs->get_u2_fast(); 1867 if (length == 0) { 1868 return objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 1869 } else { 1870 objArrayOop m = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1871 objArrayHandle methods(THREAD, m); 1872 HandleMark hm(THREAD); 1873 objArrayHandle methods_annotations; 1874 objArrayHandle methods_parameter_annotations; 1875 objArrayHandle methods_default_annotations; 1876 for (int index = 0; index < length; index++) { 1877 methodHandle method = parse_method(cp, is_interface, 1878 promoted_flags, 1879 &method_annotations, 1880 &method_parameter_annotations, 1881 &method_default_annotations, 1882 CHECK_(nullHandle)); 1883 if (method->is_final()) { 1884 *has_final_method = true; 1885 } 1886 methods->obj_at_put(index, method()); 1887 if (method_annotations.not_null()) { 1888 if (methods_annotations.is_null()) { 1889 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1890 methods_annotations = objArrayHandle(THREAD, md); 1891 } 1892 methods_annotations->obj_at_put(index, method_annotations()); 1893 } 1894 if (method_parameter_annotations.not_null()) { 1895 if (methods_parameter_annotations.is_null()) { 1896 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1897 methods_parameter_annotations = objArrayHandle(THREAD, md); 1898 } 1899 methods_parameter_annotations->obj_at_put(index, method_parameter_annotations()); 1900 } 1901 if (method_default_annotations.not_null()) { 1902 if (methods_default_annotations.is_null()) { 1903 objArrayOop md = oopFactory::new_system_objArray(length, CHECK_(nullHandle)); 1904 methods_default_annotations = objArrayHandle(THREAD, md); 1905 } 1906 methods_default_annotations->obj_at_put(index, method_default_annotations()); 1907 } 1908 } 1909 if (_need_verify && length > 1) { 1910 // Check duplicated methods 1911 ResourceMark rm(THREAD); 1912 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1913 THREAD, NameSigHash*, HASH_ROW_SIZE); 1914 initialize_hashtable(names_and_sigs); 1915 bool dup = false; 1916 { 1917 debug_only(No_Safepoint_Verifier nsv;) 1918 for (int i = 0; i < length; i++) { 1919 methodOop m = (methodOop)methods->obj_at(i); 1920 // If no duplicates, add name/signature in hashtable names_and_sigs. 1921 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 1922 dup = true; 1923 break; 1924 } 1925 } 1926 } 1927 if (dup) { 1928 classfile_parse_error("Duplicate method name&signature in class file %s", 1929 CHECK_(nullHandle)); 1930 } 1931 } 1932 1933 *methods_annotations_oop = methods_annotations(); 1934 *methods_parameter_annotations_oop = methods_parameter_annotations(); 1935 *methods_default_annotations_oop = methods_default_annotations(); 1936 1937 return methods; 1938 } 1939} 1940 1941 1942typeArrayHandle ClassFileParser::sort_methods(objArrayHandle methods, 1943 objArrayHandle methods_annotations, 1944 objArrayHandle methods_parameter_annotations, 1945 objArrayHandle methods_default_annotations, 1946 TRAPS) { 1947 typeArrayHandle nullHandle; 1948 int length = methods()->length(); 1949 // If JVMTI original method ordering is enabled we have to 1950 // remember the original class file ordering. 1951 // We temporarily use the vtable_index field in the methodOop to store the 1952 // class file index, so we can read in after calling qsort. 1953 if (JvmtiExport::can_maintain_original_method_order()) { 1954 for (int index = 0; index < length; index++) { 1955 methodOop m = methodOop(methods->obj_at(index)); 1956 assert(!m->valid_vtable_index(), "vtable index should not be set"); 1957 m->set_vtable_index(index); 1958 } 1959 } 1960 // Sort method array by ascending method name (for faster lookups & vtable construction) 1961 // Note that the ordering is not alphabetical, see symbolOopDesc::fast_compare 1962 methodOopDesc::sort_methods(methods(), 1963 methods_annotations(), 1964 methods_parameter_annotations(), 1965 methods_default_annotations()); 1966 1967 // If JVMTI original method ordering is enabled construct int array remembering the original ordering 1968 if (JvmtiExport::can_maintain_original_method_order()) { 1969 typeArrayOop new_ordering = oopFactory::new_permanent_intArray(length, CHECK_(nullHandle)); 1970 typeArrayHandle method_ordering(THREAD, new_ordering); 1971 for (int index = 0; index < length; index++) { 1972 methodOop m = methodOop(methods->obj_at(index)); 1973 int old_index = m->vtable_index(); 1974 assert(old_index >= 0 && old_index < length, "invalid method index"); 1975 method_ordering->int_at_put(index, old_index); 1976 m->set_vtable_index(methodOopDesc::invalid_vtable_index); 1977 } 1978 return method_ordering; 1979 } else { 1980 return typeArrayHandle(THREAD, Universe::the_empty_int_array()); 1981 } 1982} 1983 1984 1985void ClassFileParser::parse_classfile_sourcefile_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 1986 ClassFileStream* cfs = stream(); 1987 cfs->guarantee_more(2, CHECK); // sourcefile_index 1988 u2 sourcefile_index = cfs->get_u2_fast(); 1989 check_property( 1990 valid_cp_range(sourcefile_index, cp->length()) && 1991 cp->tag_at(sourcefile_index).is_utf8(), 1992 "Invalid SourceFile attribute at constant pool index %u in class file %s", 1993 sourcefile_index, CHECK); 1994 k->set_source_file_name(cp->symbol_at(sourcefile_index)); 1995} 1996 1997 1998 1999void ClassFileParser::parse_classfile_source_debug_extension_attribute(constantPoolHandle cp, 2000 instanceKlassHandle k, 2001 int length, TRAPS) { 2002 ClassFileStream* cfs = stream(); 2003 u1* sde_buffer = cfs->get_u1_buffer(); 2004 assert(sde_buffer != NULL, "null sde buffer"); 2005 2006 // Don't bother storing it if there is no way to retrieve it 2007 if (JvmtiExport::can_get_source_debug_extension()) { 2008 // Optimistically assume that only 1 byte UTF format is used 2009 // (common case) 2010 symbolOop sde_symbol = oopFactory::new_symbol((char*)sde_buffer, 2011 length, CHECK); 2012 k->set_source_debug_extension(sde_symbol); 2013 } 2014 // Got utf8 string, set stream position forward 2015 cfs->skip_u1(length, CHECK); 2016} 2017 2018 2019// Inner classes can be static, private or protected (classic VM does this) 2020#define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2021 2022// Return number of classes in the inner classes attribute table 2023u2 ClassFileParser::parse_classfile_inner_classes_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2024 ClassFileStream* cfs = stream(); 2025 cfs->guarantee_more(2, CHECK_0); // length 2026 u2 length = cfs->get_u2_fast(); 2027 2028 // 4-tuples of shorts [inner_class_info_index, outer_class_info_index, inner_name_index, inner_class_access_flags] 2029 typeArrayOop ic = oopFactory::new_permanent_shortArray(length*4, CHECK_0); 2030 typeArrayHandle inner_classes(THREAD, ic); 2031 int index = 0; 2032 int cp_size = cp->length(); 2033 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2034 for (int n = 0; n < length; n++) { 2035 // Inner class index 2036 u2 inner_class_info_index = cfs->get_u2_fast(); 2037 check_property( 2038 inner_class_info_index == 0 || 2039 (valid_cp_range(inner_class_info_index, cp_size) && 2040 is_klass_reference(cp, inner_class_info_index)), 2041 "inner_class_info_index %u has bad constant type in class file %s", 2042 inner_class_info_index, CHECK_0); 2043 // Outer class index 2044 u2 outer_class_info_index = cfs->get_u2_fast(); 2045 check_property( 2046 outer_class_info_index == 0 || 2047 (valid_cp_range(outer_class_info_index, cp_size) && 2048 is_klass_reference(cp, outer_class_info_index)), 2049 "outer_class_info_index %u has bad constant type in class file %s", 2050 outer_class_info_index, CHECK_0); 2051 // Inner class name 2052 u2 inner_name_index = cfs->get_u2_fast(); 2053 check_property( 2054 inner_name_index == 0 || (valid_cp_range(inner_name_index, cp_size) && 2055 cp->tag_at(inner_name_index).is_utf8()), 2056 "inner_name_index %u has bad constant type in class file %s", 2057 inner_name_index, CHECK_0); 2058 if (_need_verify) { 2059 guarantee_property(inner_class_info_index != outer_class_info_index, 2060 "Class is both outer and inner class in class file %s", CHECK_0); 2061 } 2062 // Access flags 2063 AccessFlags inner_access_flags; 2064 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2065 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2066 // Set abstract bit for old class files for backward compatibility 2067 flags |= JVM_ACC_ABSTRACT; 2068 } 2069 verify_legal_class_modifiers(flags, CHECK_0); 2070 inner_access_flags.set_flags(flags); 2071 2072 inner_classes->short_at_put(index++, inner_class_info_index); 2073 inner_classes->short_at_put(index++, outer_class_info_index); 2074 inner_classes->short_at_put(index++, inner_name_index); 2075 inner_classes->short_at_put(index++, inner_access_flags.as_short()); 2076 } 2077 2078 // 4347400: make sure there's no duplicate entry in the classes array 2079 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2080 for(int i = 0; i < inner_classes->length(); i += 4) { 2081 for(int j = i + 4; j < inner_classes->length(); j += 4) { 2082 guarantee_property((inner_classes->ushort_at(i) != inner_classes->ushort_at(j) || 2083 inner_classes->ushort_at(i+1) != inner_classes->ushort_at(j+1) || 2084 inner_classes->ushort_at(i+2) != inner_classes->ushort_at(j+2) || 2085 inner_classes->ushort_at(i+3) != inner_classes->ushort_at(j+3)), 2086 "Duplicate entry in InnerClasses in class file %s", 2087 CHECK_0); 2088 } 2089 } 2090 } 2091 2092 // Update instanceKlass with inner class info. 2093 k->set_inner_classes(inner_classes()); 2094 return length; 2095} 2096 2097void ClassFileParser::parse_classfile_synthetic_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2098 k->set_is_synthetic(); 2099} 2100 2101void ClassFileParser::parse_classfile_signature_attribute(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2102 ClassFileStream* cfs = stream(); 2103 u2 signature_index = cfs->get_u2(CHECK); 2104 check_property( 2105 valid_cp_range(signature_index, cp->length()) && 2106 cp->tag_at(signature_index).is_utf8(), 2107 "Invalid constant pool index %u in Signature attribute in class file %s", 2108 signature_index, CHECK); 2109 k->set_generic_signature(cp->symbol_at(signature_index)); 2110} 2111 2112void ClassFileParser::parse_classfile_attributes(constantPoolHandle cp, instanceKlassHandle k, TRAPS) { 2113 ClassFileStream* cfs = stream(); 2114 // Set inner classes attribute to default sentinel 2115 k->set_inner_classes(Universe::the_empty_short_array()); 2116 cfs->guarantee_more(2, CHECK); // attributes_count 2117 u2 attributes_count = cfs->get_u2_fast(); 2118 bool parsed_sourcefile_attribute = false; 2119 bool parsed_innerclasses_attribute = false; 2120 bool parsed_enclosingmethod_attribute = false; 2121 u1* runtime_visible_annotations = NULL; 2122 int runtime_visible_annotations_length = 0; 2123 u1* runtime_invisible_annotations = NULL; 2124 int runtime_invisible_annotations_length = 0; 2125 // Iterate over attributes 2126 while (attributes_count--) { 2127 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2128 u2 attribute_name_index = cfs->get_u2_fast(); 2129 u4 attribute_length = cfs->get_u4_fast(); 2130 check_property( 2131 valid_cp_range(attribute_name_index, cp->length()) && 2132 cp->tag_at(attribute_name_index).is_utf8(), 2133 "Attribute name has bad constant pool index %u in class file %s", 2134 attribute_name_index, CHECK); 2135 symbolOop tag = cp->symbol_at(attribute_name_index); 2136 if (tag == vmSymbols::tag_source_file()) { 2137 // Check for SourceFile tag 2138 if (_need_verify) { 2139 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2140 } 2141 if (parsed_sourcefile_attribute) { 2142 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2143 } else { 2144 parsed_sourcefile_attribute = true; 2145 } 2146 parse_classfile_sourcefile_attribute(cp, k, CHECK); 2147 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2148 // Check for SourceDebugExtension tag 2149 parse_classfile_source_debug_extension_attribute(cp, k, (int)attribute_length, CHECK); 2150 } else if (tag == vmSymbols::tag_inner_classes()) { 2151 // Check for InnerClasses tag 2152 if (parsed_innerclasses_attribute) { 2153 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2154 } else { 2155 parsed_innerclasses_attribute = true; 2156 } 2157 u2 num_of_classes = parse_classfile_inner_classes_attribute(cp, k, CHECK); 2158 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2159 guarantee_property(attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2160 "Wrong InnerClasses attribute length in class file %s", CHECK); 2161 } 2162 } else if (tag == vmSymbols::tag_synthetic()) { 2163 // Check for Synthetic tag 2164 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2165 if (attribute_length != 0) { 2166 classfile_parse_error( 2167 "Invalid Synthetic classfile attribute length %u in class file %s", 2168 attribute_length, CHECK); 2169 } 2170 parse_classfile_synthetic_attribute(cp, k, CHECK); 2171 } else if (tag == vmSymbols::tag_deprecated()) { 2172 // Check for Deprecatd tag - 4276120 2173 if (attribute_length != 0) { 2174 classfile_parse_error( 2175 "Invalid Deprecated classfile attribute length %u in class file %s", 2176 attribute_length, CHECK); 2177 } 2178 } else if (_major_version >= JAVA_1_5_VERSION) { 2179 if (tag == vmSymbols::tag_signature()) { 2180 if (attribute_length != 2) { 2181 classfile_parse_error( 2182 "Wrong Signature attribute length %u in class file %s", 2183 attribute_length, CHECK); 2184 } 2185 parse_classfile_signature_attribute(cp, k, CHECK); 2186 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2187 runtime_visible_annotations_length = attribute_length; 2188 runtime_visible_annotations = cfs->get_u1_buffer(); 2189 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2190 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2191 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2192 runtime_invisible_annotations_length = attribute_length; 2193 runtime_invisible_annotations = cfs->get_u1_buffer(); 2194 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2195 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2196 } else if (tag == vmSymbols::tag_enclosing_method()) { 2197 if (parsed_enclosingmethod_attribute) { 2198 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2199 } else { 2200 parsed_enclosingmethod_attribute = true; 2201 } 2202 cfs->guarantee_more(4, CHECK); // class_index, method_index 2203 u2 class_index = cfs->get_u2_fast(); 2204 u2 method_index = cfs->get_u2_fast(); 2205 if (class_index == 0) { 2206 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2207 } 2208 // Validate the constant pool indices and types 2209 if (!cp->is_within_bounds(class_index) || 2210 !is_klass_reference(cp, class_index)) { 2211 classfile_parse_error("Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2212 } 2213 if (method_index != 0 && 2214 (!cp->is_within_bounds(method_index) || 2215 !cp->tag_at(method_index).is_name_and_type())) { 2216 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2217 } 2218 k->set_enclosing_method_indices(class_index, method_index); 2219 } else { 2220 // Unknown attribute 2221 cfs->skip_u1(attribute_length, CHECK); 2222 } 2223 } else { 2224 // Unknown attribute 2225 cfs->skip_u1(attribute_length, CHECK); 2226 } 2227 } 2228 typeArrayHandle annotations = assemble_annotations(runtime_visible_annotations, 2229 runtime_visible_annotations_length, 2230 runtime_invisible_annotations, 2231 runtime_invisible_annotations_length, 2232 CHECK); 2233 k->set_class_annotations(annotations()); 2234} 2235 2236 2237typeArrayHandle ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 2238 int runtime_visible_annotations_length, 2239 u1* runtime_invisible_annotations, 2240 int runtime_invisible_annotations_length, TRAPS) { 2241 typeArrayHandle annotations; 2242 if (runtime_visible_annotations != NULL || 2243 runtime_invisible_annotations != NULL) { 2244 typeArrayOop anno = oopFactory::new_permanent_byteArray(runtime_visible_annotations_length + 2245 runtime_invisible_annotations_length, CHECK_(annotations)); 2246 annotations = typeArrayHandle(THREAD, anno); 2247 if (runtime_visible_annotations != NULL) { 2248 memcpy(annotations->byte_at_addr(0), runtime_visible_annotations, runtime_visible_annotations_length); 2249 } 2250 if (runtime_invisible_annotations != NULL) { 2251 memcpy(annotations->byte_at_addr(runtime_visible_annotations_length), runtime_invisible_annotations, runtime_invisible_annotations_length); 2252 } 2253 } 2254 return annotations; 2255} 2256 2257 2258static void initialize_static_field(fieldDescriptor* fd, TRAPS) { 2259 KlassHandle h_k (THREAD, fd->field_holder()); 2260 assert(h_k.not_null() && fd->is_static(), "just checking"); 2261 if (fd->has_initial_value()) { 2262 BasicType t = fd->field_type(); 2263 switch (t) { 2264 case T_BYTE: 2265 h_k()->byte_field_put(fd->offset(), fd->int_initial_value()); 2266 break; 2267 case T_BOOLEAN: 2268 h_k()->bool_field_put(fd->offset(), fd->int_initial_value()); 2269 break; 2270 case T_CHAR: 2271 h_k()->char_field_put(fd->offset(), fd->int_initial_value()); 2272 break; 2273 case T_SHORT: 2274 h_k()->short_field_put(fd->offset(), fd->int_initial_value()); 2275 break; 2276 case T_INT: 2277 h_k()->int_field_put(fd->offset(), fd->int_initial_value()); 2278 break; 2279 case T_FLOAT: 2280 h_k()->float_field_put(fd->offset(), fd->float_initial_value()); 2281 break; 2282 case T_DOUBLE: 2283 h_k()->double_field_put(fd->offset(), fd->double_initial_value()); 2284 break; 2285 case T_LONG: 2286 h_k()->long_field_put(fd->offset(), fd->long_initial_value()); 2287 break; 2288 case T_OBJECT: 2289 { 2290 #ifdef ASSERT 2291 symbolOop sym = oopFactory::new_symbol("Ljava/lang/String;", CHECK); 2292 assert(fd->signature() == sym, "just checking"); 2293 #endif 2294 oop string = fd->string_initial_value(CHECK); 2295 h_k()->obj_field_put(fd->offset(), string); 2296 } 2297 break; 2298 default: 2299 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 2300 "Illegal ConstantValue attribute in class file"); 2301 } 2302 } 2303} 2304 2305 2306void ClassFileParser::java_lang_ref_Reference_fix_pre(typeArrayHandle* fields_ptr, 2307 constantPoolHandle cp, FieldAllocationCount *fac_ptr, TRAPS) { 2308 // This code is for compatibility with earlier jdk's that do not 2309 // have the "discovered" field in java.lang.ref.Reference. For 1.5 2310 // the check for the "discovered" field should issue a warning if 2311 // the field is not found. For 1.6 this code should be issue a 2312 // fatal error if the "discovered" field is not found. 2313 // 2314 // Increment fac.nonstatic_oop_count so that the start of the 2315 // next type of non-static oops leaves room for the fake oop. 2316 // Do not increment next_nonstatic_oop_offset so that the 2317 // fake oop is place after the java.lang.ref.Reference oop 2318 // fields. 2319 // 2320 // Check the fields in java.lang.ref.Reference for the "discovered" 2321 // field. If it is not present, artifically create a field for it. 2322 // This allows this VM to run on early JDK where the field is not 2323 // present. 2324 2325 // 2326 // Increment fac.nonstatic_oop_count so that the start of the 2327 // next type of non-static oops leaves room for the fake oop. 2328 // Do not increment next_nonstatic_oop_offset so that the 2329 // fake oop is place after the java.lang.ref.Reference oop 2330 // fields. 2331 // 2332 // Check the fields in java.lang.ref.Reference for the "discovered" 2333 // field. If it is not present, artifically create a field for it. 2334 // This allows this VM to run on early JDK where the field is not 2335 // present. 2336 int reference_sig_index = 0; 2337 int reference_name_index = 0; 2338 int reference_index = 0; 2339 int extra = java_lang_ref_Reference::number_of_fake_oop_fields; 2340 const int n = (*fields_ptr)()->length(); 2341 for (int i = 0; i < n; i += instanceKlass::next_offset ) { 2342 int name_index = 2343 (*fields_ptr)()->ushort_at(i + instanceKlass::name_index_offset); 2344 int sig_index = 2345 (*fields_ptr)()->ushort_at(i + instanceKlass::signature_index_offset); 2346 symbolOop f_name = cp->symbol_at(name_index); 2347 symbolOop f_sig = cp->symbol_at(sig_index); 2348 if (f_sig == vmSymbols::reference_signature() && reference_index == 0) { 2349 // Save the index for reference signature for later use. 2350 // The fake discovered field does not entries in the 2351 // constant pool so the index for its signature cannot 2352 // be extracted from the constant pool. It will need 2353 // later, however. It's signature is vmSymbols::reference_signature() 2354 // so same an index for that signature. 2355 reference_sig_index = sig_index; 2356 reference_name_index = name_index; 2357 reference_index = i; 2358 } 2359 if (f_name == vmSymbols::reference_discovered_name() && 2360 f_sig == vmSymbols::reference_signature()) { 2361 // The values below are fake but will force extra 2362 // non-static oop fields and a corresponding non-static 2363 // oop map block to be allocated. 2364 extra = 0; 2365 break; 2366 } 2367 } 2368 if (extra != 0) { 2369 fac_ptr->nonstatic_oop_count += extra; 2370 // Add the additional entry to "fields" so that the klass 2371 // contains the "discoverd" field and the field will be initialized 2372 // in instances of the object. 2373 int fields_with_fix_length = (*fields_ptr)()->length() + 2374 instanceKlass::next_offset; 2375 typeArrayOop ff = oopFactory::new_permanent_shortArray( 2376 fields_with_fix_length, CHECK); 2377 typeArrayHandle fields_with_fix(THREAD, ff); 2378 2379 // Take everything from the original but the length. 2380 for (int idx = 0; idx < (*fields_ptr)->length(); idx++) { 2381 fields_with_fix->ushort_at_put(idx, (*fields_ptr)->ushort_at(idx)); 2382 } 2383 2384 // Add the fake field at the end. 2385 int i = (*fields_ptr)->length(); 2386 // There is no name index for the fake "discovered" field nor 2387 // signature but a signature is needed so that the field will 2388 // be properly initialized. Use one found for 2389 // one of the other reference fields. Be sure the index for the 2390 // name is 0. In fieldDescriptor::initialize() the index of the 2391 // name is checked. That check is by passed for the last nonstatic 2392 // oop field in a java.lang.ref.Reference which is assumed to be 2393 // this artificial "discovered" field. An assertion checks that 2394 // the name index is 0. 2395 assert(reference_index != 0, "Missing signature for reference"); 2396 2397 int j; 2398 for (j = 0; j < instanceKlass::next_offset; j++) { 2399 fields_with_fix->ushort_at_put(i + j, 2400 (*fields_ptr)->ushort_at(reference_index +j)); 2401 } 2402 // Clear the public access flag and set the private access flag. 2403 short flags; 2404 flags = 2405 fields_with_fix->ushort_at(i + instanceKlass::access_flags_offset); 2406 assert(!(flags & JVM_RECOGNIZED_FIELD_MODIFIERS), "Unexpected access flags set"); 2407 flags = flags & (~JVM_ACC_PUBLIC); 2408 flags = flags | JVM_ACC_PRIVATE; 2409 AccessFlags access_flags; 2410 access_flags.set_flags(flags); 2411 assert(!access_flags.is_public(), "Failed to clear public flag"); 2412 assert(access_flags.is_private(), "Failed to set private flag"); 2413 fields_with_fix->ushort_at_put(i + instanceKlass::access_flags_offset, 2414 flags); 2415 2416 assert(fields_with_fix->ushort_at(i + instanceKlass::name_index_offset) 2417 == reference_name_index, "The fake reference name is incorrect"); 2418 assert(fields_with_fix->ushort_at(i + instanceKlass::signature_index_offset) 2419 == reference_sig_index, "The fake reference signature is incorrect"); 2420 // The type of the field is stored in the low_offset entry during 2421 // parsing. 2422 assert(fields_with_fix->ushort_at(i + instanceKlass::low_offset) == 2423 NONSTATIC_OOP, "The fake reference type is incorrect"); 2424 2425 // "fields" is allocated in the permanent generation. Disgard 2426 // it and let it be collected. 2427 (*fields_ptr) = fields_with_fix; 2428 } 2429 return; 2430} 2431 2432 2433void ClassFileParser::java_lang_Class_fix_pre(objArrayHandle* methods_ptr, 2434 FieldAllocationCount *fac_ptr, TRAPS) { 2435 // Add fake fields for java.lang.Class instances 2436 // 2437 // This is not particularly nice. We should consider adding a 2438 // private transient object field at the Java level to 2439 // java.lang.Class. Alternatively we could add a subclass of 2440 // instanceKlass which provides an accessor and size computer for 2441 // this field, but that appears to be more code than this hack. 2442 // 2443 // NOTE that we wedge these in at the beginning rather than the 2444 // end of the object because the Class layout changed between JDK 2445 // 1.3 and JDK 1.4 with the new reflection implementation; some 2446 // nonstatic oop fields were added at the Java level. The offsets 2447 // of these fake fields can't change between these two JDK 2448 // versions because when the offsets are computed at bootstrap 2449 // time we don't know yet which version of the JDK we're running in. 2450 2451 // The values below are fake but will force two non-static oop fields and 2452 // a corresponding non-static oop map block to be allocated. 2453 const int extra = java_lang_Class::number_of_fake_oop_fields; 2454 fac_ptr->nonstatic_oop_count += extra; 2455} 2456 2457 2458void ClassFileParser::java_lang_Class_fix_post(int* next_nonstatic_oop_offset_ptr) { 2459 // Cause the extra fake fields in java.lang.Class to show up before 2460 // the Java fields for layout compatibility between 1.3 and 1.4 2461 // Incrementing next_nonstatic_oop_offset here advances the 2462 // location where the real java fields are placed. 2463 const int extra = java_lang_Class::number_of_fake_oop_fields; 2464 (*next_nonstatic_oop_offset_ptr) += (extra * heapOopSize); 2465} 2466 2467 2468instanceKlassHandle ClassFileParser::parseClassFile(symbolHandle name, 2469 Handle class_loader, 2470 Handle protection_domain, 2471 GrowableArray<Handle>* cp_patches, 2472 symbolHandle& parsed_name, 2473 TRAPS) { 2474 // So that JVMTI can cache class file in the state before retransformable agents 2475 // have modified it 2476 unsigned char *cached_class_file_bytes = NULL; 2477 jint cached_class_file_length; 2478 2479 ClassFileStream* cfs = stream(); 2480 // Timing 2481 PerfTraceTime vmtimer(ClassLoader::perf_accumulated_time()); 2482 2483 _has_finalizer = _has_empty_finalizer = _has_vanilla_constructor = false; 2484 2485 if (JvmtiExport::should_post_class_file_load_hook()) { 2486 unsigned char* ptr = cfs->buffer(); 2487 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 2488 2489 JvmtiExport::post_class_file_load_hook(name, class_loader, protection_domain, 2490 &ptr, &end_ptr, 2491 &cached_class_file_bytes, 2492 &cached_class_file_length); 2493 2494 if (ptr != cfs->buffer()) { 2495 // JVMTI agent has modified class file data. 2496 // Set new class file stream using JVMTI agent modified 2497 // class file data. 2498 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 2499 set_stream(cfs); 2500 } 2501 } 2502 2503 _cp_patches = cp_patches; 2504 2505 instanceKlassHandle nullHandle; 2506 2507 // Figure out whether we can skip format checking (matching classic VM behavior) 2508 _need_verify = Verifier::should_verify_for(class_loader()); 2509 2510 // Set the verify flag in stream 2511 cfs->set_verify(_need_verify); 2512 2513 // Save the class file name for easier error message printing. 2514 _class_name = name.not_null()? name : vmSymbolHandles::unknown_class_name(); 2515 2516 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 2517 // Magic value 2518 u4 magic = cfs->get_u4_fast(); 2519 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 2520 "Incompatible magic value %u in class file %s", 2521 magic, CHECK_(nullHandle)); 2522 2523 // Version numbers 2524 u2 minor_version = cfs->get_u2_fast(); 2525 u2 major_version = cfs->get_u2_fast(); 2526 2527 // Check version numbers - we check this even with verifier off 2528 if (!is_supported_version(major_version, minor_version)) { 2529 if (name.is_null()) { 2530 Exceptions::fthrow( 2531 THREAD_AND_LOCATION, 2532 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2533 "Unsupported major.minor version %u.%u", 2534 major_version, 2535 minor_version); 2536 } else { 2537 ResourceMark rm(THREAD); 2538 Exceptions::fthrow( 2539 THREAD_AND_LOCATION, 2540 vmSymbolHandles::java_lang_UnsupportedClassVersionError(), 2541 "%s : Unsupported major.minor version %u.%u", 2542 name->as_C_string(), 2543 major_version, 2544 minor_version); 2545 } 2546 return nullHandle; 2547 } 2548 2549 _major_version = major_version; 2550 _minor_version = minor_version; 2551 2552 2553 // Check if verification needs to be relaxed for this class file 2554 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 2555 _relax_verify = Verifier::relax_verify_for(class_loader()); 2556 2557 // Constant pool 2558 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 2559 int cp_size = cp->length(); 2560 2561 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 2562 2563 // Access flags 2564 AccessFlags access_flags; 2565 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 2566 2567 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2568 // Set abstract bit for old class files for backward compatibility 2569 flags |= JVM_ACC_ABSTRACT; 2570 } 2571 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 2572 access_flags.set_flags(flags); 2573 2574 // This class and superclass 2575 instanceKlassHandle super_klass; 2576 u2 this_class_index = cfs->get_u2_fast(); 2577 check_property( 2578 valid_cp_range(this_class_index, cp_size) && 2579 cp->tag_at(this_class_index).is_unresolved_klass(), 2580 "Invalid this class index %u in constant pool in class file %s", 2581 this_class_index, CHECK_(nullHandle)); 2582 2583 symbolHandle class_name (THREAD, cp->unresolved_klass_at(this_class_index)); 2584 assert(class_name.not_null(), "class_name can't be null"); 2585 2586 // It's important to set parsed_name *before* resolving the super class. 2587 // (it's used for cleanup by the caller if parsing fails) 2588 parsed_name = class_name; 2589 2590 // Update _class_name which could be null previously to be class_name 2591 _class_name = class_name; 2592 2593 // Don't need to check whether this class name is legal or not. 2594 // It has been checked when constant pool is parsed. 2595 // However, make sure it is not an array type. 2596 if (_need_verify) { 2597 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 2598 "Bad class name in class file %s", 2599 CHECK_(nullHandle)); 2600 } 2601 2602 klassOop preserve_this_klass; // for storing result across HandleMark 2603 2604 // release all handles when parsing is done 2605 { HandleMark hm(THREAD); 2606 2607 // Checks if name in class file matches requested name 2608 if (name.not_null() && class_name() != name()) { 2609 ResourceMark rm(THREAD); 2610 Exceptions::fthrow( 2611 THREAD_AND_LOCATION, 2612 vmSymbolHandles::java_lang_NoClassDefFoundError(), 2613 "%s (wrong name: %s)", 2614 name->as_C_string(), 2615 class_name->as_C_string() 2616 ); 2617 return nullHandle; 2618 } 2619 2620 if (TraceClassLoadingPreorder) { 2621 tty->print("[Loading %s", name()->as_klass_external_name()); 2622 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 2623 tty->print_cr("]"); 2624 } 2625 2626 u2 super_class_index = cfs->get_u2_fast(); 2627 if (super_class_index == 0) { 2628 check_property(class_name() == vmSymbols::java_lang_Object(), 2629 "Invalid superclass index %u in class file %s", 2630 super_class_index, 2631 CHECK_(nullHandle)); 2632 } else { 2633 check_property(valid_cp_range(super_class_index, cp_size) && 2634 is_klass_reference(cp, super_class_index), 2635 "Invalid superclass index %u in class file %s", 2636 super_class_index, 2637 CHECK_(nullHandle)); 2638 // The class name should be legal because it is checked when parsing constant pool. 2639 // However, make sure it is not an array type. 2640 bool is_array = false; 2641 if (cp->tag_at(super_class_index).is_klass()) { 2642 super_klass = instanceKlassHandle(THREAD, cp->resolved_klass_at(super_class_index)); 2643 if (_need_verify) 2644 is_array = super_klass->oop_is_array(); 2645 } else if (_need_verify) { 2646 is_array = (cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 2647 } 2648 if (_need_verify) { 2649 guarantee_property(!is_array, 2650 "Bad superclass name in class file %s", CHECK_(nullHandle)); 2651 } 2652 } 2653 2654 // Interfaces 2655 u2 itfs_len = cfs->get_u2_fast(); 2656 objArrayHandle local_interfaces; 2657 if (itfs_len == 0) { 2658 local_interfaces = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 2659 } else { 2660 local_interfaces = parse_interfaces(cp, itfs_len, class_loader, protection_domain, &vmtimer, _class_name, CHECK_(nullHandle)); 2661 } 2662 2663 // Fields (offsets are filled in later) 2664 struct FieldAllocationCount fac = {0,0,0,0,0,0,0,0,0,0}; 2665 objArrayHandle fields_annotations; 2666 typeArrayHandle fields = parse_fields(cp, access_flags.is_interface(), &fac, &fields_annotations, CHECK_(nullHandle)); 2667 // Methods 2668 bool has_final_method = false; 2669 AccessFlags promoted_flags; 2670 promoted_flags.set_flags(0); 2671 // These need to be oop pointers because they are allocated lazily 2672 // inside parse_methods inside a nested HandleMark 2673 objArrayOop methods_annotations_oop = NULL; 2674 objArrayOop methods_parameter_annotations_oop = NULL; 2675 objArrayOop methods_default_annotations_oop = NULL; 2676 objArrayHandle methods = parse_methods(cp, access_flags.is_interface(), 2677 &promoted_flags, 2678 &has_final_method, 2679 &methods_annotations_oop, 2680 &methods_parameter_annotations_oop, 2681 &methods_default_annotations_oop, 2682 CHECK_(nullHandle)); 2683 2684 objArrayHandle methods_annotations(THREAD, methods_annotations_oop); 2685 objArrayHandle methods_parameter_annotations(THREAD, methods_parameter_annotations_oop); 2686 objArrayHandle methods_default_annotations(THREAD, methods_default_annotations_oop); 2687 2688 // We check super class after class file is parsed and format is checked 2689 if (super_class_index > 0 && super_klass.is_null()) { 2690 symbolHandle sk (THREAD, cp->klass_name_at(super_class_index)); 2691 if (access_flags.is_interface()) { 2692 // Before attempting to resolve the superclass, check for class format 2693 // errors not checked yet. 2694 guarantee_property(sk() == vmSymbols::java_lang_Object(), 2695 "Interfaces must have java.lang.Object as superclass in class file %s", 2696 CHECK_(nullHandle)); 2697 } 2698 klassOop k = SystemDictionary::resolve_super_or_fail(class_name, 2699 sk, 2700 class_loader, 2701 protection_domain, 2702 true, 2703 CHECK_(nullHandle)); 2704 KlassHandle kh (THREAD, k); 2705 super_klass = instanceKlassHandle(THREAD, kh()); 2706 if (LinkWellKnownClasses) // my super class is well known to me 2707 cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve 2708 } 2709 if (super_klass.not_null()) { 2710 if (super_klass->is_interface()) { 2711 ResourceMark rm(THREAD); 2712 Exceptions::fthrow( 2713 THREAD_AND_LOCATION, 2714 vmSymbolHandles::java_lang_IncompatibleClassChangeError(), 2715 "class %s has interface %s as super class", 2716 class_name->as_klass_external_name(), 2717 super_klass->external_name() 2718 ); 2719 return nullHandle; 2720 } 2721 // Make sure super class is not final 2722 if (super_klass->is_final()) { 2723 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 2724 } 2725 } 2726 2727 // Compute the transitive list of all unique interfaces implemented by this class 2728 objArrayHandle transitive_interfaces = compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 2729 2730 // sort methods 2731 typeArrayHandle method_ordering = sort_methods(methods, 2732 methods_annotations, 2733 methods_parameter_annotations, 2734 methods_default_annotations, 2735 CHECK_(nullHandle)); 2736 2737 // promote flags from parse_methods() to the klass' flags 2738 access_flags.add_promoted_flags(promoted_flags.as_int()); 2739 2740 // Size of Java vtable (in words) 2741 int vtable_size = 0; 2742 int itable_size = 0; 2743 int num_miranda_methods = 0; 2744 2745 klassVtable::compute_vtable_size_and_num_mirandas(vtable_size, 2746 num_miranda_methods, 2747 super_klass(), 2748 methods(), 2749 access_flags, 2750 class_loader(), 2751 class_name(), 2752 local_interfaces()); 2753 2754 // Size of Java itable (in words) 2755 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(transitive_interfaces); 2756 2757 // Field size and offset computation 2758 int nonstatic_field_size = super_klass() == NULL ? 0 : super_klass->nonstatic_field_size(); 2759#ifndef PRODUCT 2760 int orig_nonstatic_field_size = 0; 2761#endif 2762 int static_field_size = 0; 2763 int next_static_oop_offset; 2764 int next_static_double_offset; 2765 int next_static_word_offset; 2766 int next_static_short_offset; 2767 int next_static_byte_offset; 2768 int next_static_type_offset; 2769 int next_nonstatic_oop_offset; 2770 int next_nonstatic_double_offset; 2771 int next_nonstatic_word_offset; 2772 int next_nonstatic_short_offset; 2773 int next_nonstatic_byte_offset; 2774 int next_nonstatic_type_offset; 2775 int first_nonstatic_oop_offset; 2776 int first_nonstatic_field_offset; 2777 int next_nonstatic_field_offset; 2778 2779 // Calculate the starting byte offsets 2780 next_static_oop_offset = (instanceKlass::header_size() + 2781 align_object_offset(vtable_size) + 2782 align_object_offset(itable_size)) * wordSize; 2783 next_static_double_offset = next_static_oop_offset + 2784 (fac.static_oop_count * heapOopSize); 2785 if ( fac.static_double_count && 2786 (Universe::field_type_should_be_aligned(T_DOUBLE) || 2787 Universe::field_type_should_be_aligned(T_LONG)) ) { 2788 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 2789 } 2790 2791 next_static_word_offset = next_static_double_offset + 2792 (fac.static_double_count * BytesPerLong); 2793 next_static_short_offset = next_static_word_offset + 2794 (fac.static_word_count * BytesPerInt); 2795 next_static_byte_offset = next_static_short_offset + 2796 (fac.static_short_count * BytesPerShort); 2797 next_static_type_offset = align_size_up((next_static_byte_offset + 2798 fac.static_byte_count ), wordSize ); 2799 static_field_size = (next_static_type_offset - 2800 next_static_oop_offset) / wordSize; 2801 first_nonstatic_field_offset = instanceOopDesc::base_offset_in_bytes() + 2802 nonstatic_field_size * heapOopSize; 2803 next_nonstatic_field_offset = first_nonstatic_field_offset; 2804 2805 // Add fake fields for java.lang.Class instances (also see below) 2806 if (class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2807 java_lang_Class_fix_pre(&methods, &fac, CHECK_(nullHandle)); 2808 } 2809 2810 // Add a fake "discovered" field if it is not present 2811 // for compatibility with earlier jdk's. 2812 if (class_name() == vmSymbols::java_lang_ref_Reference() 2813 && class_loader.is_null()) { 2814 java_lang_ref_Reference_fix_pre(&fields, cp, &fac, CHECK_(nullHandle)); 2815 } 2816 // end of "discovered" field compactibility fix 2817 2818 int nonstatic_double_count = fac.nonstatic_double_count; 2819 int nonstatic_word_count = fac.nonstatic_word_count; 2820 int nonstatic_short_count = fac.nonstatic_short_count; 2821 int nonstatic_byte_count = fac.nonstatic_byte_count; 2822 int nonstatic_oop_count = fac.nonstatic_oop_count; 2823 2824 bool super_has_nonstatic_fields = 2825 (super_klass() != NULL && super_klass->has_nonstatic_fields()); 2826 bool has_nonstatic_fields = super_has_nonstatic_fields || 2827 ((nonstatic_double_count + nonstatic_word_count + 2828 nonstatic_short_count + nonstatic_byte_count + 2829 nonstatic_oop_count) != 0); 2830 2831 2832 // Prepare list of oops for oop maps generation. 2833 u2* nonstatic_oop_offsets; 2834 u2* nonstatic_oop_length; 2835 int nonstatic_oop_map_count = 0; 2836 2837 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 2838 THREAD, u2, nonstatic_oop_count+1); 2839 nonstatic_oop_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2840 THREAD, u2, nonstatic_oop_count+1); 2841 2842 // Add fake fields for java.lang.Class instances (also see above). 2843 // FieldsAllocationStyle and CompactFields values will be reset to default. 2844 if(class_name() == vmSymbols::java_lang_Class() && class_loader.is_null()) { 2845 java_lang_Class_fix_post(&next_nonstatic_field_offset); 2846 nonstatic_oop_offsets[0] = (u2)first_nonstatic_field_offset; 2847 int fake_oop_count = (( next_nonstatic_field_offset - 2848 first_nonstatic_field_offset ) / heapOopSize); 2849 nonstatic_oop_length [0] = (u2)fake_oop_count; 2850 nonstatic_oop_map_count = 1; 2851 nonstatic_oop_count -= fake_oop_count; 2852 first_nonstatic_oop_offset = first_nonstatic_field_offset; 2853 } else { 2854 first_nonstatic_oop_offset = 0; // will be set for first oop field 2855 } 2856 2857#ifndef PRODUCT 2858 if( PrintCompactFieldsSavings ) { 2859 next_nonstatic_double_offset = next_nonstatic_field_offset + 2860 (nonstatic_oop_count * heapOopSize); 2861 if ( nonstatic_double_count > 0 ) { 2862 next_nonstatic_double_offset = align_size_up(next_nonstatic_double_offset, BytesPerLong); 2863 } 2864 next_nonstatic_word_offset = next_nonstatic_double_offset + 2865 (nonstatic_double_count * BytesPerLong); 2866 next_nonstatic_short_offset = next_nonstatic_word_offset + 2867 (nonstatic_word_count * BytesPerInt); 2868 next_nonstatic_byte_offset = next_nonstatic_short_offset + 2869 (nonstatic_short_count * BytesPerShort); 2870 next_nonstatic_type_offset = align_size_up((next_nonstatic_byte_offset + 2871 nonstatic_byte_count ), heapOopSize ); 2872 orig_nonstatic_field_size = nonstatic_field_size + 2873 ((next_nonstatic_type_offset - first_nonstatic_field_offset)/heapOopSize); 2874 } 2875#endif 2876 bool compact_fields = CompactFields; 2877 int allocation_style = FieldsAllocationStyle; 2878 if( allocation_style < 0 || allocation_style > 1 ) { // Out of range? 2879 assert(false, "0 <= FieldsAllocationStyle <= 1"); 2880 allocation_style = 1; // Optimistic 2881 } 2882 2883 // The next classes have predefined hard-coded fields offsets 2884 // (see in JavaClasses::compute_hard_coded_offsets()). 2885 // Use default fields allocation order for them. 2886 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 2887 (class_name() == vmSymbols::java_lang_AssertionStatusDirectives() || 2888 class_name() == vmSymbols::java_lang_Class() || 2889 class_name() == vmSymbols::java_lang_ClassLoader() || 2890 class_name() == vmSymbols::java_lang_ref_Reference() || 2891 class_name() == vmSymbols::java_lang_ref_SoftReference() || 2892 class_name() == vmSymbols::java_lang_StackTraceElement() || 2893 class_name() == vmSymbols::java_lang_String() || 2894 class_name() == vmSymbols::java_lang_Throwable() || 2895 class_name() == vmSymbols::java_lang_Boolean() || 2896 class_name() == vmSymbols::java_lang_Character() || 2897 class_name() == vmSymbols::java_lang_Float() || 2898 class_name() == vmSymbols::java_lang_Double() || 2899 class_name() == vmSymbols::java_lang_Byte() || 2900 class_name() == vmSymbols::java_lang_Short() || 2901 class_name() == vmSymbols::java_lang_Integer() || 2902 class_name() == vmSymbols::java_lang_Long())) { 2903 allocation_style = 0; // Allocate oops first 2904 compact_fields = false; // Don't compact fields 2905 } 2906 2907 if( allocation_style == 0 ) { 2908 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes 2909 next_nonstatic_oop_offset = next_nonstatic_field_offset; 2910 next_nonstatic_double_offset = next_nonstatic_oop_offset + 2911 (nonstatic_oop_count * heapOopSize); 2912 } else if( allocation_style == 1 ) { 2913 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops 2914 next_nonstatic_double_offset = next_nonstatic_field_offset; 2915 } else { 2916 ShouldNotReachHere(); 2917 } 2918 2919 int nonstatic_oop_space_count = 0; 2920 int nonstatic_word_space_count = 0; 2921 int nonstatic_short_space_count = 0; 2922 int nonstatic_byte_space_count = 0; 2923 int nonstatic_oop_space_offset; 2924 int nonstatic_word_space_offset; 2925 int nonstatic_short_space_offset; 2926 int nonstatic_byte_space_offset; 2927 2928 if( nonstatic_double_count > 0 ) { 2929 int offset = next_nonstatic_double_offset; 2930 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 2931 if( compact_fields && offset != next_nonstatic_double_offset ) { 2932 // Allocate available fields into the gap before double field. 2933 int length = next_nonstatic_double_offset - offset; 2934 assert(length == BytesPerInt, ""); 2935 nonstatic_word_space_offset = offset; 2936 if( nonstatic_word_count > 0 ) { 2937 nonstatic_word_count -= 1; 2938 nonstatic_word_space_count = 1; // Only one will fit 2939 length -= BytesPerInt; 2940 offset += BytesPerInt; 2941 } 2942 nonstatic_short_space_offset = offset; 2943 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 2944 nonstatic_short_count -= 1; 2945 nonstatic_short_space_count += 1; 2946 length -= BytesPerShort; 2947 offset += BytesPerShort; 2948 } 2949 nonstatic_byte_space_offset = offset; 2950 while( length > 0 && nonstatic_byte_count > 0 ) { 2951 nonstatic_byte_count -= 1; 2952 nonstatic_byte_space_count += 1; 2953 length -= 1; 2954 } 2955 // Allocate oop field in the gap if there are no other fields for that. 2956 nonstatic_oop_space_offset = offset; 2957 if( length >= heapOopSize && nonstatic_oop_count > 0 && 2958 allocation_style != 0 ) { // when oop fields not first 2959 nonstatic_oop_count -= 1; 2960 nonstatic_oop_space_count = 1; // Only one will fit 2961 length -= heapOopSize; 2962 offset += heapOopSize; 2963 } 2964 } 2965 } 2966 2967 next_nonstatic_word_offset = next_nonstatic_double_offset + 2968 (nonstatic_double_count * BytesPerLong); 2969 next_nonstatic_short_offset = next_nonstatic_word_offset + 2970 (nonstatic_word_count * BytesPerInt); 2971 next_nonstatic_byte_offset = next_nonstatic_short_offset + 2972 (nonstatic_short_count * BytesPerShort); 2973 2974 int notaligned_offset; 2975 if( allocation_style == 0 ) { 2976 notaligned_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 2977 } else { // allocation_style == 1 2978 next_nonstatic_oop_offset = next_nonstatic_byte_offset + nonstatic_byte_count; 2979 if( nonstatic_oop_count > 0 ) { 2980 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 2981 } 2982 notaligned_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 2983 } 2984 next_nonstatic_type_offset = align_size_up(notaligned_offset, heapOopSize ); 2985 nonstatic_field_size = nonstatic_field_size + ((next_nonstatic_type_offset 2986 - first_nonstatic_field_offset)/heapOopSize); 2987 2988 // Iterate over fields again and compute correct offsets. 2989 // The field allocation type was temporarily stored in the offset slot. 2990 // oop fields are located before non-oop fields (static and non-static). 2991 int len = fields->length(); 2992 for (int i = 0; i < len; i += instanceKlass::next_offset) { 2993 int real_offset; 2994 FieldAllocationType atype = (FieldAllocationType) fields->ushort_at(i+4); 2995 switch (atype) { 2996 case STATIC_OOP: 2997 real_offset = next_static_oop_offset; 2998 next_static_oop_offset += heapOopSize; 2999 break; 3000 case STATIC_BYTE: 3001 real_offset = next_static_byte_offset; 3002 next_static_byte_offset += 1; 3003 break; 3004 case STATIC_SHORT: 3005 real_offset = next_static_short_offset; 3006 next_static_short_offset += BytesPerShort; 3007 break; 3008 case STATIC_WORD: 3009 real_offset = next_static_word_offset; 3010 next_static_word_offset += BytesPerInt; 3011 break; 3012 case STATIC_ALIGNED_DOUBLE: 3013 case STATIC_DOUBLE: 3014 real_offset = next_static_double_offset; 3015 next_static_double_offset += BytesPerLong; 3016 break; 3017 case NONSTATIC_OOP: 3018 if( nonstatic_oop_space_count > 0 ) { 3019 real_offset = nonstatic_oop_space_offset; 3020 nonstatic_oop_space_offset += heapOopSize; 3021 nonstatic_oop_space_count -= 1; 3022 } else { 3023 real_offset = next_nonstatic_oop_offset; 3024 next_nonstatic_oop_offset += heapOopSize; 3025 } 3026 // Update oop maps 3027 if( nonstatic_oop_map_count > 0 && 3028 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3029 (u2)(real_offset - nonstatic_oop_length[nonstatic_oop_map_count - 1] * heapOopSize) ) { 3030 // Extend current oop map 3031 nonstatic_oop_length[nonstatic_oop_map_count - 1] += 1; 3032 } else { 3033 // Create new oop map 3034 nonstatic_oop_offsets[nonstatic_oop_map_count] = (u2)real_offset; 3035 nonstatic_oop_length [nonstatic_oop_map_count] = 1; 3036 nonstatic_oop_map_count += 1; 3037 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3038 first_nonstatic_oop_offset = real_offset; 3039 } 3040 } 3041 break; 3042 case NONSTATIC_BYTE: 3043 if( nonstatic_byte_space_count > 0 ) { 3044 real_offset = nonstatic_byte_space_offset; 3045 nonstatic_byte_space_offset += 1; 3046 nonstatic_byte_space_count -= 1; 3047 } else { 3048 real_offset = next_nonstatic_byte_offset; 3049 next_nonstatic_byte_offset += 1; 3050 } 3051 break; 3052 case NONSTATIC_SHORT: 3053 if( nonstatic_short_space_count > 0 ) { 3054 real_offset = nonstatic_short_space_offset; 3055 nonstatic_short_space_offset += BytesPerShort; 3056 nonstatic_short_space_count -= 1; 3057 } else { 3058 real_offset = next_nonstatic_short_offset; 3059 next_nonstatic_short_offset += BytesPerShort; 3060 } 3061 break; 3062 case NONSTATIC_WORD: 3063 if( nonstatic_word_space_count > 0 ) { 3064 real_offset = nonstatic_word_space_offset; 3065 nonstatic_word_space_offset += BytesPerInt; 3066 nonstatic_word_space_count -= 1; 3067 } else { 3068 real_offset = next_nonstatic_word_offset; 3069 next_nonstatic_word_offset += BytesPerInt; 3070 } 3071 break; 3072 case NONSTATIC_ALIGNED_DOUBLE: 3073 case NONSTATIC_DOUBLE: 3074 real_offset = next_nonstatic_double_offset; 3075 next_nonstatic_double_offset += BytesPerLong; 3076 break; 3077 default: 3078 ShouldNotReachHere(); 3079 } 3080 fields->short_at_put(i+4, extract_low_short_from_int(real_offset) ); 3081 fields->short_at_put(i+5, extract_high_short_from_int(real_offset) ); 3082 } 3083 3084 // Size of instances 3085 int instance_size; 3086 3087 next_nonstatic_type_offset = align_size_up(notaligned_offset, wordSize ); 3088 instance_size = align_object_size(next_nonstatic_type_offset / wordSize); 3089 3090 assert(instance_size == align_object_size(align_size_up((instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), wordSize) / wordSize), "consistent layout helper value"); 3091 3092 // Size of non-static oop map blocks (in words) allocated at end of klass 3093 int nonstatic_oop_map_size = compute_oop_map_size(super_klass, nonstatic_oop_map_count, first_nonstatic_oop_offset); 3094 3095 // Compute reference type 3096 ReferenceType rt; 3097 if (super_klass() == NULL) { 3098 rt = REF_NONE; 3099 } else { 3100 rt = super_klass->reference_type(); 3101 } 3102 3103 // We can now create the basic klassOop for this klass 3104 klassOop ik = oopFactory::new_instanceKlass( 3105 vtable_size, itable_size, 3106 static_field_size, nonstatic_oop_map_size, 3107 rt, CHECK_(nullHandle)); 3108 instanceKlassHandle this_klass (THREAD, ik); 3109 3110 assert(this_klass->static_field_size() == static_field_size && 3111 this_klass->nonstatic_oop_map_size() == nonstatic_oop_map_size, "sanity check"); 3112 3113 // Fill in information already parsed 3114 this_klass->set_access_flags(access_flags); 3115 jint lh = Klass::instance_layout_helper(instance_size, false); 3116 this_klass->set_layout_helper(lh); 3117 assert(this_klass->oop_is_instance(), "layout is correct"); 3118 assert(this_klass->size_helper() == instance_size, "correct size_helper"); 3119 // Not yet: supers are done below to support the new subtype-checking fields 3120 //this_klass->set_super(super_klass()); 3121 this_klass->set_class_loader(class_loader()); 3122 this_klass->set_nonstatic_field_size(nonstatic_field_size); 3123 this_klass->set_has_nonstatic_fields(has_nonstatic_fields); 3124 this_klass->set_static_oop_field_size(fac.static_oop_count); 3125 cp->set_pool_holder(this_klass()); 3126 this_klass->set_constants(cp()); 3127 this_klass->set_local_interfaces(local_interfaces()); 3128 this_klass->set_fields(fields()); 3129 this_klass->set_methods(methods()); 3130 if (has_final_method) { 3131 this_klass->set_has_final_method(); 3132 } 3133 this_klass->set_method_ordering(method_ordering()); 3134 this_klass->set_initial_method_idnum(methods->length()); 3135 this_klass->set_name(cp->klass_name_at(this_class_index)); 3136 if (LinkWellKnownClasses) // I am well known to myself 3137 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 3138 this_klass->set_protection_domain(protection_domain()); 3139 this_klass->set_fields_annotations(fields_annotations()); 3140 this_klass->set_methods_annotations(methods_annotations()); 3141 this_klass->set_methods_parameter_annotations(methods_parameter_annotations()); 3142 this_klass->set_methods_default_annotations(methods_default_annotations()); 3143 3144 this_klass->set_minor_version(minor_version); 3145 this_klass->set_major_version(major_version); 3146 3147 if (cached_class_file_bytes != NULL) { 3148 // JVMTI: we have an instanceKlass now, tell it about the cached bytes 3149 this_klass->set_cached_class_file(cached_class_file_bytes, 3150 cached_class_file_length); 3151 } 3152 3153 // Miranda methods 3154 if ((num_miranda_methods > 0) || 3155 // if this class introduced new miranda methods or 3156 (super_klass.not_null() && (super_klass->has_miranda_methods())) 3157 // super class exists and this class inherited miranda methods 3158 ) { 3159 this_klass->set_has_miranda_methods(); // then set a flag 3160 } 3161 3162 // Additional attributes 3163 parse_classfile_attributes(cp, this_klass, CHECK_(nullHandle)); 3164 3165 // Make sure this is the end of class file stream 3166 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3167 3168 // Initialize static fields 3169 this_klass->do_local_static_fields(&initialize_static_field, CHECK_(nullHandle)); 3170 3171 // VerifyOops believes that once this has been set, the object is completely loaded. 3172 // Compute transitive closure of interfaces this class implements 3173 this_klass->set_transitive_interfaces(transitive_interfaces()); 3174 3175 // Fill in information needed to compute superclasses. 3176 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 3177 3178 // Initialize itable offset tables 3179 klassItable::setup_itable_offset_table(this_klass); 3180 3181 // Do final class setup 3182 fill_oop_maps(this_klass, nonstatic_oop_map_count, nonstatic_oop_offsets, nonstatic_oop_length); 3183 3184 set_precomputed_flags(this_klass); 3185 3186 // reinitialize modifiers, using the InnerClasses attribute 3187 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 3188 this_klass->set_modifier_flags(computed_modifiers); 3189 3190 // check if this class can access its super class 3191 check_super_class_access(this_klass, CHECK_(nullHandle)); 3192 3193 // check if this class can access its superinterfaces 3194 check_super_interface_access(this_klass, CHECK_(nullHandle)); 3195 3196 // check if this class overrides any final method 3197 check_final_method_override(this_klass, CHECK_(nullHandle)); 3198 3199 // check that if this class is an interface then it doesn't have static methods 3200 if (this_klass->is_interface()) { 3201 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 3202 } 3203 3204 ClassLoadingService::notify_class_loaded(instanceKlass::cast(this_klass()), 3205 false /* not shared class */); 3206 3207 if (TraceClassLoading) { 3208 // print in a single call to reduce interleaving of output 3209 if (cfs->source() != NULL) { 3210 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3211 cfs->source()); 3212 } else if (class_loader.is_null()) { 3213 if (THREAD->is_Java_thread()) { 3214 klassOop caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 3215 tty->print("[Loaded %s by instance of %s]\n", 3216 this_klass->external_name(), 3217 instanceKlass::cast(caller)->external_name()); 3218 } else { 3219 tty->print("[Loaded %s]\n", this_klass->external_name()); 3220 } 3221 } else { 3222 ResourceMark rm; 3223 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 3224 instanceKlass::cast(class_loader->klass())->external_name()); 3225 } 3226 } 3227 3228 if (TraceClassResolution) { 3229 // print out the superclass. 3230 const char * from = Klass::cast(this_klass())->external_name(); 3231 if (this_klass->java_super() != NULL) { 3232 tty->print("RESOLVE %s %s\n", from, instanceKlass::cast(this_klass->java_super())->external_name()); 3233 } 3234 // print out each of the interface classes referred to by this class. 3235 objArrayHandle local_interfaces(THREAD, this_klass->local_interfaces()); 3236 if (!local_interfaces.is_null()) { 3237 int length = local_interfaces->length(); 3238 for (int i = 0; i < length; i++) { 3239 klassOop k = klassOop(local_interfaces->obj_at(i)); 3240 instanceKlass* to_class = instanceKlass::cast(k); 3241 const char * to = to_class->external_name(); 3242 tty->print("RESOLVE %s %s\n", from, to); 3243 } 3244 } 3245 } 3246 3247#ifndef PRODUCT 3248 if( PrintCompactFieldsSavings ) { 3249 if( nonstatic_field_size < orig_nonstatic_field_size ) { 3250 tty->print("[Saved %d of %d bytes in %s]\n", 3251 (orig_nonstatic_field_size - nonstatic_field_size)*heapOopSize, 3252 orig_nonstatic_field_size*heapOopSize, 3253 this_klass->external_name()); 3254 } else if( nonstatic_field_size > orig_nonstatic_field_size ) { 3255 tty->print("[Wasted %d over %d bytes in %s]\n", 3256 (nonstatic_field_size - orig_nonstatic_field_size)*heapOopSize, 3257 orig_nonstatic_field_size*heapOopSize, 3258 this_klass->external_name()); 3259 } 3260 } 3261#endif 3262 3263 // preserve result across HandleMark 3264 preserve_this_klass = this_klass(); 3265 } 3266 3267 // Create new handle outside HandleMark 3268 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 3269 debug_only(this_klass->as_klassOop()->verify();) 3270 3271 return this_klass; 3272} 3273 3274 3275int ClassFileParser::compute_oop_map_size(instanceKlassHandle super, int nonstatic_oop_map_count, int first_nonstatic_oop_offset) { 3276 int map_size = super.is_null() ? 0 : super->nonstatic_oop_map_size(); 3277 if (nonstatic_oop_map_count > 0) { 3278 // We have oops to add to map 3279 if (map_size == 0) { 3280 map_size = nonstatic_oop_map_count; 3281 } else { 3282 // Check whether we should add a new map block or whether the last one can be extended 3283 OopMapBlock* first_map = super->start_of_nonstatic_oop_maps(); 3284 OopMapBlock* last_map = first_map + map_size - 1; 3285 3286 int next_offset = last_map->offset() + (last_map->length() * heapOopSize); 3287 if (next_offset == first_nonstatic_oop_offset) { 3288 // There is no gap bettwen superklass's last oop field and first 3289 // local oop field, merge maps. 3290 nonstatic_oop_map_count -= 1; 3291 } else { 3292 // Superklass didn't end with a oop field, add extra maps 3293 assert(next_offset<first_nonstatic_oop_offset, "just checking"); 3294 } 3295 map_size += nonstatic_oop_map_count; 3296 } 3297 } 3298 return map_size; 3299} 3300 3301 3302void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 3303 int nonstatic_oop_map_count, 3304 u2* nonstatic_oop_offsets, u2* nonstatic_oop_length) { 3305 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 3306 OopMapBlock* last_oop_map = this_oop_map + k->nonstatic_oop_map_size(); 3307 instanceKlass* super = k->superklass(); 3308 if (super != NULL) { 3309 int super_oop_map_size = super->nonstatic_oop_map_size(); 3310 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 3311 // Copy maps from superklass 3312 while (super_oop_map_size-- > 0) { 3313 *this_oop_map++ = *super_oop_map++; 3314 } 3315 } 3316 if (nonstatic_oop_map_count > 0) { 3317 if (this_oop_map + nonstatic_oop_map_count > last_oop_map) { 3318 // Calculated in compute_oop_map_size() number of oop maps is less then 3319 // collected oop maps since there is no gap between superklass's last oop 3320 // field and first local oop field. Extend the last oop map copied 3321 // from the superklass instead of creating new one. 3322 nonstatic_oop_map_count--; 3323 nonstatic_oop_offsets++; 3324 this_oop_map--; 3325 this_oop_map->set_length(this_oop_map->length() + *nonstatic_oop_length++); 3326 this_oop_map++; 3327 } 3328 assert((this_oop_map + nonstatic_oop_map_count) == last_oop_map, "just checking"); 3329 // Add new map blocks, fill them 3330 while (nonstatic_oop_map_count-- > 0) { 3331 this_oop_map->set_offset(*nonstatic_oop_offsets++); 3332 this_oop_map->set_length(*nonstatic_oop_length++); 3333 this_oop_map++; 3334 } 3335 } 3336} 3337 3338 3339void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 3340 klassOop super = k->super(); 3341 3342 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 3343 // in which case we don't have to register objects as finalizable 3344 if (!_has_empty_finalizer) { 3345 if (_has_finalizer || 3346 (super != NULL && super->klass_part()->has_finalizer())) { 3347 k->set_has_finalizer(); 3348 } 3349 } 3350 3351#ifdef ASSERT 3352 bool f = false; 3353 methodOop m = k->lookup_method(vmSymbols::finalize_method_name(), 3354 vmSymbols::void_method_signature()); 3355 if (m != NULL && !m->is_empty_method()) { 3356 f = true; 3357 } 3358 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 3359#endif 3360 3361 // Check if this klass supports the java.lang.Cloneable interface 3362 if (SystemDictionary::cloneable_klass_loaded()) { 3363 if (k->is_subtype_of(SystemDictionary::cloneable_klass())) { 3364 k->set_is_cloneable(); 3365 } 3366 } 3367 3368 // Check if this klass has a vanilla default constructor 3369 if (super == NULL) { 3370 // java.lang.Object has empty default constructor 3371 k->set_has_vanilla_constructor(); 3372 } else { 3373 if (Klass::cast(super)->has_vanilla_constructor() && 3374 _has_vanilla_constructor) { 3375 k->set_has_vanilla_constructor(); 3376 } 3377#ifdef ASSERT 3378 bool v = false; 3379 if (Klass::cast(super)->has_vanilla_constructor()) { 3380 methodOop constructor = k->find_method(vmSymbols::object_initializer_name( 3381), vmSymbols::void_method_signature()); 3382 if (constructor != NULL && constructor->is_vanilla_constructor()) { 3383 v = true; 3384 } 3385 } 3386 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 3387#endif 3388 } 3389 3390 // If it cannot be fast-path allocated, set a bit in the layout helper. 3391 // See documentation of instanceKlass::can_be_fastpath_allocated(). 3392 assert(k->size_helper() > 0, "layout_helper is initialized"); 3393 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 3394 || k->is_abstract() || k->is_interface() 3395 || (k->name() == vmSymbols::java_lang_Class() 3396 && k->class_loader() == NULL) 3397 || k->size_helper() >= FastAllocateSizeLimit) { 3398 // Forbid fast-path allocation. 3399 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 3400 k->set_layout_helper(lh); 3401 } 3402} 3403 3404 3405// utility method for appending and array with check for duplicates 3406 3407void append_interfaces(objArrayHandle result, int& index, objArrayOop ifs) { 3408 // iterate over new interfaces 3409 for (int i = 0; i < ifs->length(); i++) { 3410 oop e = ifs->obj_at(i); 3411 assert(e->is_klass() && instanceKlass::cast(klassOop(e))->is_interface(), "just checking"); 3412 // check for duplicates 3413 bool duplicate = false; 3414 for (int j = 0; j < index; j++) { 3415 if (result->obj_at(j) == e) { 3416 duplicate = true; 3417 break; 3418 } 3419 } 3420 // add new interface 3421 if (!duplicate) { 3422 result->obj_at_put(index++, e); 3423 } 3424 } 3425} 3426 3427objArrayHandle ClassFileParser::compute_transitive_interfaces(instanceKlassHandle super, objArrayHandle local_ifs, TRAPS) { 3428 // Compute maximum size for transitive interfaces 3429 int max_transitive_size = 0; 3430 int super_size = 0; 3431 // Add superclass transitive interfaces size 3432 if (super.not_null()) { 3433 super_size = super->transitive_interfaces()->length(); 3434 max_transitive_size += super_size; 3435 } 3436 // Add local interfaces' super interfaces 3437 int local_size = local_ifs->length(); 3438 for (int i = 0; i < local_size; i++) { 3439 klassOop l = klassOop(local_ifs->obj_at(i)); 3440 max_transitive_size += instanceKlass::cast(l)->transitive_interfaces()->length(); 3441 } 3442 // Finally add local interfaces 3443 max_transitive_size += local_size; 3444 // Construct array 3445 objArrayHandle result; 3446 if (max_transitive_size == 0) { 3447 // no interfaces, use canonicalized array 3448 result = objArrayHandle(THREAD, Universe::the_empty_system_obj_array()); 3449 } else if (max_transitive_size == super_size) { 3450 // no new local interfaces added, share superklass' transitive interface array 3451 result = objArrayHandle(THREAD, super->transitive_interfaces()); 3452 } else if (max_transitive_size == local_size) { 3453 // only local interfaces added, share local interface array 3454 result = local_ifs; 3455 } else { 3456 objArrayHandle nullHandle; 3457 objArrayOop new_objarray = oopFactory::new_system_objArray(max_transitive_size, CHECK_(nullHandle)); 3458 result = objArrayHandle(THREAD, new_objarray); 3459 int index = 0; 3460 // Copy down from superclass 3461 if (super.not_null()) { 3462 append_interfaces(result, index, super->transitive_interfaces()); 3463 } 3464 // Copy down from local interfaces' superinterfaces 3465 for (int i = 0; i < local_ifs->length(); i++) { 3466 klassOop l = klassOop(local_ifs->obj_at(i)); 3467 append_interfaces(result, index, instanceKlass::cast(l)->transitive_interfaces()); 3468 } 3469 // Finally add local interfaces 3470 append_interfaces(result, index, local_ifs()); 3471 3472 // Check if duplicates were removed 3473 if (index != max_transitive_size) { 3474 assert(index < max_transitive_size, "just checking"); 3475 objArrayOop new_result = oopFactory::new_system_objArray(index, CHECK_(nullHandle)); 3476 for (int i = 0; i < index; i++) { 3477 oop e = result->obj_at(i); 3478 assert(e != NULL, "just checking"); 3479 new_result->obj_at_put(i, e); 3480 } 3481 result = objArrayHandle(THREAD, new_result); 3482 } 3483 } 3484 return result; 3485} 3486 3487 3488void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 3489 klassOop super = this_klass->super(); 3490 if ((super != NULL) && 3491 (!Reflection::verify_class_access(this_klass->as_klassOop(), super, false))) { 3492 ResourceMark rm(THREAD); 3493 Exceptions::fthrow( 3494 THREAD_AND_LOCATION, 3495 vmSymbolHandles::java_lang_IllegalAccessError(), 3496 "class %s cannot access its superclass %s", 3497 this_klass->external_name(), 3498 instanceKlass::cast(super)->external_name() 3499 ); 3500 return; 3501 } 3502} 3503 3504 3505void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 3506 objArrayHandle local_interfaces (THREAD, this_klass->local_interfaces()); 3507 int lng = local_interfaces->length(); 3508 for (int i = lng - 1; i >= 0; i--) { 3509 klassOop k = klassOop(local_interfaces->obj_at(i)); 3510 assert (k != NULL && Klass::cast(k)->is_interface(), "invalid interface"); 3511 if (!Reflection::verify_class_access(this_klass->as_klassOop(), k, false)) { 3512 ResourceMark rm(THREAD); 3513 Exceptions::fthrow( 3514 THREAD_AND_LOCATION, 3515 vmSymbolHandles::java_lang_IllegalAccessError(), 3516 "class %s cannot access its superinterface %s", 3517 this_klass->external_name(), 3518 instanceKlass::cast(k)->external_name() 3519 ); 3520 return; 3521 } 3522 } 3523} 3524 3525 3526void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 3527 objArrayHandle methods (THREAD, this_klass->methods()); 3528 int num_methods = methods->length(); 3529 3530 // go thru each method and check if it overrides a final method 3531 for (int index = 0; index < num_methods; index++) { 3532 methodOop m = (methodOop)methods->obj_at(index); 3533 3534 // skip private, static and <init> methods 3535 if ((!m->is_private()) && 3536 (!m->is_static()) && 3537 (m->name() != vmSymbols::object_initializer_name())) { 3538 3539 symbolOop name = m->name(); 3540 symbolOop signature = m->signature(); 3541 klassOop k = this_klass->super(); 3542 methodOop super_m = NULL; 3543 while (k != NULL) { 3544 // skip supers that don't have final methods. 3545 if (k->klass_part()->has_final_method()) { 3546 // lookup a matching method in the super class hierarchy 3547 super_m = instanceKlass::cast(k)->lookup_method(name, signature); 3548 if (super_m == NULL) { 3549 break; // didn't find any match; get out 3550 } 3551 3552 if (super_m->is_final() && 3553 // matching method in super is final 3554 (Reflection::verify_field_access(this_klass->as_klassOop(), 3555 super_m->method_holder(), 3556 super_m->method_holder(), 3557 super_m->access_flags(), false)) 3558 // this class can access super final method and therefore override 3559 ) { 3560 ResourceMark rm(THREAD); 3561 Exceptions::fthrow( 3562 THREAD_AND_LOCATION, 3563 vmSymbolHandles::java_lang_VerifyError(), 3564 "class %s overrides final method %s.%s", 3565 this_klass->external_name(), 3566 name->as_C_string(), 3567 signature->as_C_string() 3568 ); 3569 return; 3570 } 3571 3572 // continue to look from super_m's holder's super. 3573 k = instanceKlass::cast(super_m->method_holder())->super(); 3574 continue; 3575 } 3576 3577 k = k->klass_part()->super(); 3578 } 3579 } 3580 } 3581} 3582 3583 3584// assumes that this_klass is an interface 3585void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 3586 assert(this_klass->is_interface(), "not an interface"); 3587 objArrayHandle methods (THREAD, this_klass->methods()); 3588 int num_methods = methods->length(); 3589 3590 for (int index = 0; index < num_methods; index++) { 3591 methodOop m = (methodOop)methods->obj_at(index); 3592 // if m is static and not the init method, throw a verify error 3593 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 3594 ResourceMark rm(THREAD); 3595 Exceptions::fthrow( 3596 THREAD_AND_LOCATION, 3597 vmSymbolHandles::java_lang_VerifyError(), 3598 "Illegal static method %s in interface %s", 3599 m->name()->as_C_string(), 3600 this_klass->external_name() 3601 ); 3602 return; 3603 } 3604 } 3605} 3606 3607// utility methods for format checking 3608 3609void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 3610 if (!_need_verify) { return; } 3611 3612 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3613 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3614 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3615 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 3616 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3617 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 3618 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3619 3620 if ((is_abstract && is_final) || 3621 (is_interface && !is_abstract) || 3622 (is_interface && major_gte_15 && (is_super || is_enum)) || 3623 (!is_interface && major_gte_15 && is_annotation)) { 3624 ResourceMark rm(THREAD); 3625 Exceptions::fthrow( 3626 THREAD_AND_LOCATION, 3627 vmSymbolHandles::java_lang_ClassFormatError(), 3628 "Illegal class modifiers in class %s: 0x%X", 3629 _class_name->as_C_string(), flags 3630 ); 3631 return; 3632 } 3633} 3634 3635bool ClassFileParser::has_illegal_visibility(jint flags) { 3636 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3637 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3638 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3639 3640 return ((is_public && is_protected) || 3641 (is_public && is_private) || 3642 (is_protected && is_private)); 3643} 3644 3645bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 3646 u2 max_version = JDK_Version::is_gte_jdk17x_version() ? 3647 JAVA_MAX_SUPPORTED_VERSION : JAVA_6_VERSION; 3648 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 3649 (major <= max_version) && 3650 ((major != max_version) || 3651 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 3652} 3653 3654void ClassFileParser::verify_legal_field_modifiers( 3655 jint flags, bool is_interface, TRAPS) { 3656 if (!_need_verify) { return; } 3657 3658 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3659 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 3660 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3661 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3662 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3663 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 3664 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 3665 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 3666 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3667 3668 bool is_illegal = false; 3669 3670 if (is_interface) { 3671 if (!is_public || !is_static || !is_final || is_private || 3672 is_protected || is_volatile || is_transient || 3673 (major_gte_15 && is_enum)) { 3674 is_illegal = true; 3675 } 3676 } else { // not interface 3677 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 3678 is_illegal = true; 3679 } 3680 } 3681 3682 if (is_illegal) { 3683 ResourceMark rm(THREAD); 3684 Exceptions::fthrow( 3685 THREAD_AND_LOCATION, 3686 vmSymbolHandles::java_lang_ClassFormatError(), 3687 "Illegal field modifiers in class %s: 0x%X", 3688 _class_name->as_C_string(), flags); 3689 return; 3690 } 3691} 3692 3693void ClassFileParser::verify_legal_method_modifiers( 3694 jint flags, bool is_interface, symbolHandle name, TRAPS) { 3695 if (!_need_verify) { return; } 3696 3697 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 3698 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 3699 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 3700 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 3701 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 3702 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 3703 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 3704 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 3705 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 3706 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 3707 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 3708 3709 bool is_illegal = false; 3710 3711 if (is_interface) { 3712 if (!is_abstract || !is_public || is_static || is_final || 3713 is_native || (major_gte_15 && (is_synchronized || is_strict))) { 3714 is_illegal = true; 3715 } 3716 } else { // not interface 3717 if (is_initializer) { 3718 if (is_static || is_final || is_synchronized || is_native || 3719 is_abstract || (major_gte_15 && is_bridge)) { 3720 is_illegal = true; 3721 } 3722 } else { // not initializer 3723 if (is_abstract) { 3724 if ((is_final || is_native || is_private || is_static || 3725 (major_gte_15 && (is_synchronized || is_strict)))) { 3726 is_illegal = true; 3727 } 3728 } 3729 if (has_illegal_visibility(flags)) { 3730 is_illegal = true; 3731 } 3732 } 3733 } 3734 3735 if (is_illegal) { 3736 ResourceMark rm(THREAD); 3737 Exceptions::fthrow( 3738 THREAD_AND_LOCATION, 3739 vmSymbolHandles::java_lang_ClassFormatError(), 3740 "Method %s in class %s has illegal modifiers: 0x%X", 3741 name->as_C_string(), _class_name->as_C_string(), flags); 3742 return; 3743 } 3744} 3745 3746void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 3747 assert(_need_verify, "only called when _need_verify is true"); 3748 int i = 0; 3749 int count = length >> 2; 3750 for (int k=0; k<count; k++) { 3751 unsigned char b0 = buffer[i]; 3752 unsigned char b1 = buffer[i+1]; 3753 unsigned char b2 = buffer[i+2]; 3754 unsigned char b3 = buffer[i+3]; 3755 // For an unsigned char v, 3756 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 3757 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 3758 unsigned char res = b0 | b0 - 1 | 3759 b1 | b1 - 1 | 3760 b2 | b2 - 1 | 3761 b3 | b3 - 1; 3762 if (res >= 128) break; 3763 i += 4; 3764 } 3765 for(; i < length; i++) { 3766 unsigned short c; 3767 // no embedded zeros 3768 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 3769 if(buffer[i] < 128) { 3770 continue; 3771 } 3772 if ((i + 5) < length) { // see if it's legal supplementary character 3773 if (UTF8::is_supplementary_character(&buffer[i])) { 3774 c = UTF8::get_supplementary_character(&buffer[i]); 3775 i += 5; 3776 continue; 3777 } 3778 } 3779 switch (buffer[i] >> 4) { 3780 default: break; 3781 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 3782 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3783 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 3784 c = (buffer[i] & 0x1F) << 6; 3785 i++; 3786 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 3787 c += buffer[i] & 0x3F; 3788 if (_major_version <= 47 || c == 0 || c >= 0x80) { 3789 // for classes with major > 47, c must a null or a character in its shortest form 3790 break; 3791 } 3792 } 3793 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3794 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 3795 c = (buffer[i] & 0xF) << 12; 3796 i += 2; 3797 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 3798 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 3799 if (_major_version <= 47 || c >= 0x800) { 3800 // for classes with major > 47, c must be in its shortest form 3801 break; 3802 } 3803 } 3804 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 3805 } // end of switch 3806 } // end of for 3807} 3808 3809// Checks if name is a legal class name. 3810void ClassFileParser::verify_legal_class_name(symbolHandle name, TRAPS) { 3811 if (!_need_verify || _relax_verify) { return; } 3812 3813 char buf[fixed_buffer_size]; 3814 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3815 unsigned int length = name->utf8_length(); 3816 bool legal = false; 3817 3818 if (length > 0) { 3819 char* p; 3820 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 3821 p = skip_over_field_signature(bytes, false, length, CHECK); 3822 legal = (p != NULL) && ((p - bytes) == (int)length); 3823 } else if (_major_version < JAVA_1_5_VERSION) { 3824 if (bytes[0] != '<') { 3825 p = skip_over_field_name(bytes, true, length); 3826 legal = (p != NULL) && ((p - bytes) == (int)length); 3827 } 3828 } else { 3829 // 4900761: relax the constraints based on JSR202 spec 3830 // Class names may be drawn from the entire Unicode character set. 3831 // Identifiers between '/' must be unqualified names. 3832 // The utf8 string has been verified when parsing cpool entries. 3833 legal = verify_unqualified_name(bytes, length, LegalClass); 3834 } 3835 } 3836 if (!legal) { 3837 ResourceMark rm(THREAD); 3838 Exceptions::fthrow( 3839 THREAD_AND_LOCATION, 3840 vmSymbolHandles::java_lang_ClassFormatError(), 3841 "Illegal class name \"%s\" in class file %s", bytes, 3842 _class_name->as_C_string() 3843 ); 3844 return; 3845 } 3846} 3847 3848// Checks if name is a legal field name. 3849void ClassFileParser::verify_legal_field_name(symbolHandle name, TRAPS) { 3850 if (!_need_verify || _relax_verify) { return; } 3851 3852 char buf[fixed_buffer_size]; 3853 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3854 unsigned int length = name->utf8_length(); 3855 bool legal = false; 3856 3857 if (length > 0) { 3858 if (_major_version < JAVA_1_5_VERSION) { 3859 if (bytes[0] != '<') { 3860 char* p = skip_over_field_name(bytes, false, length); 3861 legal = (p != NULL) && ((p - bytes) == (int)length); 3862 } 3863 } else { 3864 // 4881221: relax the constraints based on JSR202 spec 3865 legal = verify_unqualified_name(bytes, length, LegalField); 3866 } 3867 } 3868 3869 if (!legal) { 3870 ResourceMark rm(THREAD); 3871 Exceptions::fthrow( 3872 THREAD_AND_LOCATION, 3873 vmSymbolHandles::java_lang_ClassFormatError(), 3874 "Illegal field name \"%s\" in class %s", bytes, 3875 _class_name->as_C_string() 3876 ); 3877 return; 3878 } 3879} 3880 3881// Checks if name is a legal method name. 3882void ClassFileParser::verify_legal_method_name(symbolHandle name, TRAPS) { 3883 if (!_need_verify || _relax_verify) { return; } 3884 3885 assert(!name.is_null(), "method name is null"); 3886 char buf[fixed_buffer_size]; 3887 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3888 unsigned int length = name->utf8_length(); 3889 bool legal = false; 3890 3891 if (length > 0) { 3892 if (bytes[0] == '<') { 3893 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 3894 legal = true; 3895 } 3896 } else if (_major_version < JAVA_1_5_VERSION) { 3897 char* p; 3898 p = skip_over_field_name(bytes, false, length); 3899 legal = (p != NULL) && ((p - bytes) == (int)length); 3900 } else { 3901 // 4881221: relax the constraints based on JSR202 spec 3902 legal = verify_unqualified_name(bytes, length, LegalMethod); 3903 } 3904 } 3905 3906 if (!legal) { 3907 ResourceMark rm(THREAD); 3908 Exceptions::fthrow( 3909 THREAD_AND_LOCATION, 3910 vmSymbolHandles::java_lang_ClassFormatError(), 3911 "Illegal method name \"%s\" in class %s", bytes, 3912 _class_name->as_C_string() 3913 ); 3914 return; 3915 } 3916} 3917 3918 3919// Checks if signature is a legal field signature. 3920void ClassFileParser::verify_legal_field_signature(symbolHandle name, symbolHandle signature, TRAPS) { 3921 if (!_need_verify) { return; } 3922 3923 char buf[fixed_buffer_size]; 3924 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3925 unsigned int length = signature->utf8_length(); 3926 char* p = skip_over_field_signature(bytes, false, length, CHECK); 3927 3928 if (p == NULL || (p - bytes) != (int)length) { 3929 ResourceMark rm(THREAD); 3930 Exceptions::fthrow( 3931 THREAD_AND_LOCATION, 3932 vmSymbolHandles::java_lang_ClassFormatError(), 3933 "Field \"%s\" in class %s has illegal signature \"%s\"", 3934 name->as_C_string(), _class_name->as_C_string(), bytes 3935 ); 3936 return; 3937 } 3938} 3939 3940// Checks if signature is a legal method signature. 3941// Returns number of parameters 3942int ClassFileParser::verify_legal_method_signature(symbolHandle name, symbolHandle signature, TRAPS) { 3943 if (!_need_verify) { 3944 // make sure caller's args_size will be less than 0 even for non-static 3945 // method so it will be recomputed in compute_size_of_parameters(). 3946 return -2; 3947 } 3948 3949 unsigned int args_size = 0; 3950 char buf[fixed_buffer_size]; 3951 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 3952 unsigned int length = signature->utf8_length(); 3953 char* nextp; 3954 3955 // The first character must be a '(' 3956 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 3957 length--; 3958 // Skip over legal field signatures 3959 nextp = skip_over_field_signature(p, false, length, CHECK_0); 3960 while ((length > 0) && (nextp != NULL)) { 3961 args_size++; 3962 if (p[0] == 'J' || p[0] == 'D') { 3963 args_size++; 3964 } 3965 length -= nextp - p; 3966 p = nextp; 3967 nextp = skip_over_field_signature(p, false, length, CHECK_0); 3968 } 3969 // The first non-signature thing better be a ')' 3970 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 3971 length--; 3972 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 3973 // All internal methods must return void 3974 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 3975 return args_size; 3976 } 3977 } else { 3978 // Now we better just have a return value 3979 nextp = skip_over_field_signature(p, true, length, CHECK_0); 3980 if (nextp && ((int)length == (nextp - p))) { 3981 return args_size; 3982 } 3983 } 3984 } 3985 } 3986 // Report error 3987 ResourceMark rm(THREAD); 3988 Exceptions::fthrow( 3989 THREAD_AND_LOCATION, 3990 vmSymbolHandles::java_lang_ClassFormatError(), 3991 "Method \"%s\" in class %s has illegal signature \"%s\"", 3992 name->as_C_string(), _class_name->as_C_string(), p 3993 ); 3994 return 0; 3995} 3996 3997 3998// Unqualified names may not contain the characters '.', ';', or '/'. 3999// Method names also may not contain the characters '<' or '>', unless <init> or <clinit>. 4000// Note that method names may not be <init> or <clinit> in this method. 4001// Because these names have been checked as special cases before calling this method 4002// in verify_legal_method_name. 4003bool ClassFileParser::verify_unqualified_name(char* name, unsigned int length, int type) { 4004 jchar ch; 4005 4006 for (char* p = name; p != name + length; ) { 4007 ch = *p; 4008 if (ch < 128) { 4009 p++; 4010 if (ch == '.' || ch == ';') { 4011 return false; // do not permit '.' or ';' 4012 } 4013 if (type != LegalClass && ch == '/') { 4014 return false; // do not permit '/' unless it's class name 4015 } 4016 if (type == LegalMethod && (ch == '<' || ch == '>')) { 4017 return false; // do not permit '<' or '>' in method names 4018 } 4019 } else { 4020 char* tmp_p = UTF8::next(p, &ch); 4021 p = tmp_p; 4022 } 4023 } 4024 return true; 4025} 4026 4027 4028// Take pointer to a string. Skip over the longest part of the string that could 4029// be taken as a fieldname. Allow '/' if slash_ok is true. 4030// Return a pointer to just past the fieldname. 4031// Return NULL if no fieldname at all was found, or in the case of slash_ok 4032// being true, we saw consecutive slashes (meaning we were looking for a 4033// qualified path but found something that was badly-formed). 4034char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 4035 char* p; 4036 jchar ch; 4037 jboolean last_is_slash = false; 4038 jboolean not_first_ch = false; 4039 4040 for (p = name; p != name + length; not_first_ch = true) { 4041 char* old_p = p; 4042 ch = *p; 4043 if (ch < 128) { 4044 p++; 4045 // quick check for ascii 4046 if ((ch >= 'a' && ch <= 'z') || 4047 (ch >= 'A' && ch <= 'Z') || 4048 (ch == '_' || ch == '$') || 4049 (not_first_ch && ch >= '0' && ch <= '9')) { 4050 last_is_slash = false; 4051 continue; 4052 } 4053 if (slash_ok && ch == '/') { 4054 if (last_is_slash) { 4055 return NULL; // Don't permit consecutive slashes 4056 } 4057 last_is_slash = true; 4058 continue; 4059 } 4060 } else { 4061 jint unicode_ch; 4062 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4063 p = tmp_p; 4064 last_is_slash = false; 4065 // Check if ch is Java identifier start or is Java identifier part 4066 // 4672820: call java.lang.Character methods directly without generating separate tables. 4067 EXCEPTION_MARK; 4068 instanceKlassHandle klass (THREAD, SystemDictionary::char_klass()); 4069 4070 // return value 4071 JavaValue result(T_BOOLEAN); 4072 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 4073 JavaCallArguments args; 4074 args.push_int(unicode_ch); 4075 4076 // public static boolean isJavaIdentifierStart(char ch); 4077 JavaCalls::call_static(&result, 4078 klass, 4079 vmSymbolHandles::isJavaIdentifierStart_name(), 4080 vmSymbolHandles::int_bool_signature(), 4081 &args, 4082 THREAD); 4083 4084 if (HAS_PENDING_EXCEPTION) { 4085 CLEAR_PENDING_EXCEPTION; 4086 return 0; 4087 } 4088 if (result.get_jboolean()) { 4089 continue; 4090 } 4091 4092 if (not_first_ch) { 4093 // public static boolean isJavaIdentifierPart(char ch); 4094 JavaCalls::call_static(&result, 4095 klass, 4096 vmSymbolHandles::isJavaIdentifierPart_name(), 4097 vmSymbolHandles::int_bool_signature(), 4098 &args, 4099 THREAD); 4100 4101 if (HAS_PENDING_EXCEPTION) { 4102 CLEAR_PENDING_EXCEPTION; 4103 return 0; 4104 } 4105 4106 if (result.get_jboolean()) { 4107 continue; 4108 } 4109 } 4110 } 4111 return (not_first_ch) ? old_p : NULL; 4112 } 4113 return (not_first_ch) ? p : NULL; 4114} 4115 4116 4117// Take pointer to a string. Skip over the longest part of the string that could 4118// be taken as a field signature. Allow "void" if void_ok. 4119// Return a pointer to just past the signature. 4120// Return NULL if no legal signature is found. 4121char* ClassFileParser::skip_over_field_signature(char* signature, 4122 bool void_ok, 4123 unsigned int length, 4124 TRAPS) { 4125 unsigned int array_dim = 0; 4126 while (length > 0) { 4127 switch (signature[0]) { 4128 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 4129 case JVM_SIGNATURE_BOOLEAN: 4130 case JVM_SIGNATURE_BYTE: 4131 case JVM_SIGNATURE_CHAR: 4132 case JVM_SIGNATURE_SHORT: 4133 case JVM_SIGNATURE_INT: 4134 case JVM_SIGNATURE_FLOAT: 4135 case JVM_SIGNATURE_LONG: 4136 case JVM_SIGNATURE_DOUBLE: 4137 return signature + 1; 4138 case JVM_SIGNATURE_CLASS: { 4139 if (_major_version < JAVA_1_5_VERSION) { 4140 // Skip over the class name if one is there 4141 char* p = skip_over_field_name(signature + 1, true, --length); 4142 4143 // The next character better be a semicolon 4144 if (p && (p - signature) > 1 && p[0] == ';') { 4145 return p + 1; 4146 } 4147 } else { 4148 // 4900761: For class version > 48, any unicode is allowed in class name. 4149 length--; 4150 signature++; 4151 while (length > 0 && signature[0] != ';') { 4152 if (signature[0] == '.') { 4153 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 4154 } 4155 length--; 4156 signature++; 4157 } 4158 if (signature[0] == ';') { return signature + 1; } 4159 } 4160 4161 return NULL; 4162 } 4163 case JVM_SIGNATURE_ARRAY: 4164 array_dim++; 4165 if (array_dim > 255) { 4166 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4167 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 4168 } 4169 // The rest of what's there better be a legal signature 4170 signature++; 4171 length--; 4172 void_ok = false; 4173 break; 4174 4175 default: 4176 return NULL; 4177 } 4178 } 4179 return NULL; 4180} 4181