1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileParser.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.inline.hpp" 29 #include "classfile/defaultMethods.hpp" 30 #include "classfile/javaClasses.inline.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/verificationType.hpp" 34 #include "classfile/verifier.hpp" 35 #include "classfile/vmSymbols.hpp" 36 #include "gc/shared/gcLocker.hpp" 37 #include "memory/allocation.hpp" 38 #include "memory/metadataFactory.hpp" 39 #include "memory/oopFactory.hpp" 40 #include "memory/referenceType.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/constantPool.hpp" 44 #include "oops/fieldStreams.hpp" 45 #include "oops/instanceKlass.hpp" 46 #include "oops/instanceMirrorKlass.hpp" 47 #include "oops/klass.inline.hpp" 48 #include "oops/klassVtable.hpp" 49 #include "oops/method.hpp" 50 #include "oops/symbol.hpp" 51 #include "prims/jvm.h" 52 #include "prims/jvmtiExport.hpp" 53 #include "prims/jvmtiThreadState.hpp" 54 #include "runtime/javaCalls.hpp" 55 #include "runtime/perfData.hpp" 56 #include "runtime/reflection.hpp" 57 #include "runtime/signature.hpp" 58 #include "runtime/timer.hpp" 59 #include "services/classLoadingService.hpp" 60 #include "services/threadService.hpp" 61 #include "utilities/array.hpp" 62 #include "utilities/exceptions.hpp" 63 #include "utilities/globalDefinitions.hpp" 64 #include "utilities/macros.hpp" 65 #include "utilities/ostream.hpp" 66 #include "utilities/resourceHash.hpp" 67 #if INCLUDE_CDS 68 #include "classfile/systemDictionaryShared.hpp" 69 #endif 70 71 // We generally try to create the oops directly when parsing, rather than 72 // allocating temporary data structures and copying the bytes twice. A 73 // temporary area is only needed when parsing utf8 entries in the constant 74 // pool and when parsing line number tables. 75 76 // We add assert in debug mode when class format is not checked. 77 78 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 79 #define JAVA_MIN_SUPPORTED_VERSION 45 80 #define JAVA_MAX_SUPPORTED_VERSION 52 81 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 82 83 // Used for two backward compatibility reasons: 84 // - to check for new additions to the class file format in JDK1.5 85 // - to check for bug fixes in the format checker in JDK1.5 86 #define JAVA_1_5_VERSION 49 87 88 // Used for backward compatibility reasons: 89 // - to check for javac bug fixes that happened after 1.5 90 // - also used as the max version when running in jdk6 91 #define JAVA_6_VERSION 50 92 93 // Used for backward compatibility reasons: 94 // - to check NameAndType_info signatures more aggressively 95 #define JAVA_7_VERSION 51 96 97 // Extension method support. 98 #define JAVA_8_VERSION 52 99 100 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 101 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 102 // this function (_current can be allocated in a register, with scalar 103 // replacement of aggregates). The _current pointer is copied back to 104 // stream() when this function returns. DON'T call another method within 105 // this method that uses stream(). 106 ClassFileStream* cfs0 = stream(); 107 ClassFileStream cfs1 = *cfs0; 108 ClassFileStream* cfs = &cfs1; 109 #ifdef ASSERT 110 assert(cfs->allocated_on_stack(),"should be local"); 111 u1* old_current = cfs0->current(); 112 #endif 113 Handle class_loader(THREAD, _loader_data->class_loader()); 114 115 // Used for batching symbol allocations. 116 const char* names[SymbolTable::symbol_alloc_batch_size]; 117 int lengths[SymbolTable::symbol_alloc_batch_size]; 118 int indices[SymbolTable::symbol_alloc_batch_size]; 119 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 120 int names_count = 0; 121 122 // parsing Index 0 is unused 123 for (int index = 1; index < length; index++) { 124 // Each of the following case guarantees one more byte in the stream 125 // for the following tag or the access_flags following constant pool, 126 // so we don't need bounds-check for reading tag. 127 u1 tag = cfs->get_u1_fast(); 128 switch (tag) { 129 case JVM_CONSTANT_Class : 130 { 131 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 132 u2 name_index = cfs->get_u2_fast(); 133 _cp->klass_index_at_put(index, name_index); 134 } 135 break; 136 case JVM_CONSTANT_Fieldref : 137 { 138 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 139 u2 class_index = cfs->get_u2_fast(); 140 u2 name_and_type_index = cfs->get_u2_fast(); 141 _cp->field_at_put(index, class_index, name_and_type_index); 142 } 143 break; 144 case JVM_CONSTANT_Methodref : 145 { 146 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 147 u2 class_index = cfs->get_u2_fast(); 148 u2 name_and_type_index = cfs->get_u2_fast(); 149 _cp->method_at_put(index, class_index, name_and_type_index); 150 } 151 break; 152 case JVM_CONSTANT_InterfaceMethodref : 153 { 154 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 155 u2 class_index = cfs->get_u2_fast(); 156 u2 name_and_type_index = cfs->get_u2_fast(); 157 _cp->interface_method_at_put(index, class_index, name_and_type_index); 158 } 159 break; 160 case JVM_CONSTANT_String : 161 { 162 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 163 u2 string_index = cfs->get_u2_fast(); 164 _cp->string_index_at_put(index, string_index); 165 } 166 break; 167 case JVM_CONSTANT_MethodHandle : 168 case JVM_CONSTANT_MethodType : 169 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 170 classfile_parse_error( 171 "Class file version does not support constant tag %u in class file %s", 172 tag, CHECK); 173 } 174 if (tag == JVM_CONSTANT_MethodHandle) { 175 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 176 u1 ref_kind = cfs->get_u1_fast(); 177 u2 method_index = cfs->get_u2_fast(); 178 _cp->method_handle_index_at_put(index, ref_kind, method_index); 179 } else if (tag == JVM_CONSTANT_MethodType) { 180 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 181 u2 signature_index = cfs->get_u2_fast(); 182 _cp->method_type_index_at_put(index, signature_index); 183 } else { 184 ShouldNotReachHere(); 185 } 186 break; 187 case JVM_CONSTANT_InvokeDynamic : 188 { 189 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 190 classfile_parse_error( 191 "Class file version does not support constant tag %u in class file %s", 192 tag, CHECK); 193 } 194 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 195 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 196 u2 name_and_type_index = cfs->get_u2_fast(); 197 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 198 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 199 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 200 } 201 break; 202 case JVM_CONSTANT_Integer : 203 { 204 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 205 u4 bytes = cfs->get_u4_fast(); 206 _cp->int_at_put(index, (jint) bytes); 207 } 208 break; 209 case JVM_CONSTANT_Float : 210 { 211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 212 u4 bytes = cfs->get_u4_fast(); 213 _cp->float_at_put(index, *(jfloat*)&bytes); 214 } 215 break; 216 case JVM_CONSTANT_Long : 217 // A mangled type might cause you to overrun allocated memory 218 guarantee_property(index+1 < length, 219 "Invalid constant pool entry %u in class file %s", 220 index, CHECK); 221 { 222 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 223 u8 bytes = cfs->get_u8_fast(); 224 _cp->long_at_put(index, bytes); 225 } 226 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 227 break; 228 case JVM_CONSTANT_Double : 229 // A mangled type might cause you to overrun allocated memory 230 guarantee_property(index+1 < length, 231 "Invalid constant pool entry %u in class file %s", 232 index, CHECK); 233 { 234 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 235 u8 bytes = cfs->get_u8_fast(); 236 _cp->double_at_put(index, *(jdouble*)&bytes); 237 } 238 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 239 break; 240 case JVM_CONSTANT_NameAndType : 241 { 242 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 243 u2 name_index = cfs->get_u2_fast(); 244 u2 signature_index = cfs->get_u2_fast(); 245 _cp->name_and_type_at_put(index, name_index, signature_index); 246 } 247 break; 248 case JVM_CONSTANT_Utf8 : 249 { 250 cfs->guarantee_more(2, CHECK); // utf8_length 251 u2 utf8_length = cfs->get_u2_fast(); 252 u1* utf8_buffer = cfs->get_u1_buffer(); 253 assert(utf8_buffer != NULL, "null utf8 buffer"); 254 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 255 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 256 cfs->skip_u1_fast(utf8_length); 257 258 // Before storing the symbol, make sure it's legal 259 if (_need_verify) { 260 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 261 } 262 263 if (has_cp_patch_at(index)) { 264 Handle patch = clear_cp_patch_at(index); 265 guarantee_property(java_lang_String::is_instance(patch()), 266 "Illegal utf8 patch at %d in class file %s", 267 index, CHECK); 268 char* str = java_lang_String::as_utf8_string(patch()); 269 // (could use java_lang_String::as_symbol instead, but might as well batch them) 270 utf8_buffer = (u1*) str; 271 utf8_length = (int) strlen(str); 272 } 273 274 unsigned int hash; 275 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 276 if (result == NULL) { 277 names[names_count] = (char*)utf8_buffer; 278 lengths[names_count] = utf8_length; 279 indices[names_count] = index; 280 hashValues[names_count++] = hash; 281 if (names_count == SymbolTable::symbol_alloc_batch_size) { 282 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 283 names_count = 0; 284 } 285 } else { 286 _cp->symbol_at_put(index, result); 287 } 288 } 289 break; 290 default: 291 classfile_parse_error( 292 "Unknown constant tag %u in class file %s", tag, CHECK); 293 break; 294 } 295 } 296 297 // Allocate the remaining symbols 298 if (names_count > 0) { 299 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 300 } 301 302 // Copy _current pointer of local copy back to stream(). 303 #ifdef ASSERT 304 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 305 #endif 306 cfs0->set_current(cfs1.current()); 307 } 308 309 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 310 311 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 312 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 313 return cp->symbol_at(index); 314 else 315 return NULL; 316 } 317 318 PRAGMA_DIAG_PUSH 319 PRAGMA_FORMAT_NONLITERAL_IGNORED 320 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) { 321 ResourceMark rm(THREAD); 322 fatal(err_msg(msg, _class_name->as_C_string())); 323 } 324 325 void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) { 326 ResourceMark rm(THREAD); 327 fatal(err_msg(msg, index, _class_name->as_C_string())); 328 } 329 PRAGMA_DIAG_POP 330 331 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 332 ClassFileStream* cfs = stream(); 333 constantPoolHandle nullHandle; 334 335 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 336 u2 length = cfs->get_u2_fast(); 337 guarantee_property( 338 length >= 1, "Illegal constant pool size %u in class file %s", 339 length, CHECK_(nullHandle)); 340 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 341 CHECK_(nullHandle)); 342 _cp = constant_pool; // save in case of errors 343 constantPoolHandle cp (THREAD, constant_pool); 344 345 // parsing constant pool entries 346 parse_constant_pool_entries(length, CHECK_(nullHandle)); 347 348 int index = 1; // declared outside of loops for portability 349 350 // first verification pass - validate cross references and fixup class and string constants 351 for (index = 1; index < length; index++) { // Index 0 is unused 352 jbyte tag = cp->tag_at(index).value(); 353 switch (tag) { 354 case JVM_CONSTANT_Class : 355 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 356 break; 357 case JVM_CONSTANT_Fieldref : 358 // fall through 359 case JVM_CONSTANT_Methodref : 360 // fall through 361 case JVM_CONSTANT_InterfaceMethodref : { 362 if (!_need_verify) break; 363 int klass_ref_index = cp->klass_ref_index_at(index); 364 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 365 check_property(valid_klass_reference_at(klass_ref_index), 366 "Invalid constant pool index %u in class file %s", 367 klass_ref_index, 368 CHECK_(nullHandle)); 369 check_property(valid_cp_range(name_and_type_ref_index, length) && 370 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 371 "Invalid constant pool index %u in class file %s", 372 name_and_type_ref_index, 373 CHECK_(nullHandle)); 374 break; 375 } 376 case JVM_CONSTANT_String : 377 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 378 break; 379 case JVM_CONSTANT_Integer : 380 break; 381 case JVM_CONSTANT_Float : 382 break; 383 case JVM_CONSTANT_Long : 384 case JVM_CONSTANT_Double : 385 index++; 386 check_property( 387 (index < length && cp->tag_at(index).is_invalid()), 388 "Improper constant pool long/double index %u in class file %s", 389 index, CHECK_(nullHandle)); 390 break; 391 case JVM_CONSTANT_NameAndType : { 392 if (!_need_verify) break; 393 int name_ref_index = cp->name_ref_index_at(index); 394 int signature_ref_index = cp->signature_ref_index_at(index); 395 check_property(valid_symbol_at(name_ref_index), 396 "Invalid constant pool index %u in class file %s", 397 name_ref_index, CHECK_(nullHandle)); 398 check_property(valid_symbol_at(signature_ref_index), 399 "Invalid constant pool index %u in class file %s", 400 signature_ref_index, CHECK_(nullHandle)); 401 break; 402 } 403 case JVM_CONSTANT_Utf8 : 404 break; 405 case JVM_CONSTANT_UnresolvedClass : // fall-through 406 case JVM_CONSTANT_UnresolvedClassInError: 407 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 408 break; 409 case JVM_CONSTANT_ClassIndex : 410 { 411 int class_index = cp->klass_index_at(index); 412 check_property(valid_symbol_at(class_index), 413 "Invalid constant pool index %u in class file %s", 414 class_index, CHECK_(nullHandle)); 415 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 416 } 417 break; 418 case JVM_CONSTANT_StringIndex : 419 { 420 int string_index = cp->string_index_at(index); 421 check_property(valid_symbol_at(string_index), 422 "Invalid constant pool index %u in class file %s", 423 string_index, CHECK_(nullHandle)); 424 Symbol* sym = cp->symbol_at(string_index); 425 cp->unresolved_string_at_put(index, sym); 426 } 427 break; 428 case JVM_CONSTANT_MethodHandle : 429 { 430 int ref_index = cp->method_handle_index_at(index); 431 check_property( 432 valid_cp_range(ref_index, length), 433 "Invalid constant pool index %u in class file %s", 434 ref_index, CHECK_(nullHandle)); 435 constantTag tag = cp->tag_at(ref_index); 436 int ref_kind = cp->method_handle_ref_kind_at(index); 437 switch (ref_kind) { 438 case JVM_REF_getField: 439 case JVM_REF_getStatic: 440 case JVM_REF_putField: 441 case JVM_REF_putStatic: 442 check_property( 443 tag.is_field(), 444 "Invalid constant pool index %u in class file %s (not a field)", 445 ref_index, CHECK_(nullHandle)); 446 break; 447 case JVM_REF_invokeVirtual: 448 case JVM_REF_newInvokeSpecial: 449 check_property( 450 tag.is_method(), 451 "Invalid constant pool index %u in class file %s (not a method)", 452 ref_index, CHECK_(nullHandle)); 453 break; 454 case JVM_REF_invokeStatic: 455 case JVM_REF_invokeSpecial: 456 check_property(tag.is_method() || 457 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 458 "Invalid constant pool index %u in class file %s (not a method)", 459 ref_index, CHECK_(nullHandle)); 460 break; 461 case JVM_REF_invokeInterface: 462 check_property( 463 tag.is_interface_method(), 464 "Invalid constant pool index %u in class file %s (not an interface method)", 465 ref_index, CHECK_(nullHandle)); 466 break; 467 default: 468 classfile_parse_error( 469 "Bad method handle kind at constant pool index %u in class file %s", 470 index, CHECK_(nullHandle)); 471 } 472 // Keep the ref_index unchanged. It will be indirected at link-time. 473 } 474 break; 475 case JVM_CONSTANT_MethodType : 476 { 477 int ref_index = cp->method_type_index_at(index); 478 check_property(valid_symbol_at(ref_index), 479 "Invalid constant pool index %u in class file %s", 480 ref_index, CHECK_(nullHandle)); 481 } 482 break; 483 case JVM_CONSTANT_InvokeDynamic : 484 { 485 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 486 check_property(valid_cp_range(name_and_type_ref_index, length) && 487 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 488 "Invalid constant pool index %u in class file %s", 489 name_and_type_ref_index, 490 CHECK_(nullHandle)); 491 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 492 break; 493 } 494 default: 495 fatal(err_msg("bad constant pool tag value %u", 496 cp->tag_at(index).value())); 497 ShouldNotReachHere(); 498 break; 499 } // end of switch 500 } // end of for 501 502 if (_cp_patches != NULL) { 503 // need to treat this_class specially... 504 int this_class_index; 505 { 506 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 507 u1* mark = cfs->current(); 508 u2 flags = cfs->get_u2_fast(); 509 this_class_index = cfs->get_u2_fast(); 510 cfs->set_current(mark); // revert to mark 511 } 512 513 for (index = 1; index < length; index++) { // Index 0 is unused 514 if (has_cp_patch_at(index)) { 515 guarantee_property(index != this_class_index, 516 "Illegal constant pool patch to self at %d in class file %s", 517 index, CHECK_(nullHandle)); 518 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 519 } 520 } 521 } 522 523 if (!_need_verify) { 524 return cp; 525 } 526 527 // second verification pass - checks the strings are of the right format. 528 // but not yet to the other entries 529 for (index = 1; index < length; index++) { 530 jbyte tag = cp->tag_at(index).value(); 531 switch (tag) { 532 case JVM_CONSTANT_UnresolvedClass: { 533 Symbol* class_name = cp->klass_name_at(index); 534 // check the name, even if _cp_patches will overwrite it 535 verify_legal_class_name(class_name, CHECK_(nullHandle)); 536 break; 537 } 538 case JVM_CONSTANT_NameAndType: { 539 if (_need_verify && _major_version >= JAVA_7_VERSION) { 540 int sig_index = cp->signature_ref_index_at(index); 541 int name_index = cp->name_ref_index_at(index); 542 Symbol* name = cp->symbol_at(name_index); 543 Symbol* sig = cp->symbol_at(sig_index); 544 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 545 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 546 } else { 547 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 548 } 549 } 550 break; 551 } 552 case JVM_CONSTANT_InvokeDynamic: 553 case JVM_CONSTANT_Fieldref: 554 case JVM_CONSTANT_Methodref: 555 case JVM_CONSTANT_InterfaceMethodref: { 556 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 557 // already verified to be utf8 558 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 559 // already verified to be utf8 560 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 561 Symbol* name = cp->symbol_at(name_ref_index); 562 Symbol* signature = cp->symbol_at(signature_ref_index); 563 if (tag == JVM_CONSTANT_Fieldref) { 564 verify_legal_field_name(name, CHECK_(nullHandle)); 565 if (_need_verify && _major_version >= JAVA_7_VERSION) { 566 // Signature is verified above, when iterating NameAndType_info. 567 // Need only to be sure it's the right type. 568 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 569 throwIllegalSignature( 570 "Field", name, signature, CHECK_(nullHandle)); 571 } 572 } else { 573 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 574 } 575 } else { 576 verify_legal_method_name(name, CHECK_(nullHandle)); 577 if (_need_verify && _major_version >= JAVA_7_VERSION) { 578 // Signature is verified above, when iterating NameAndType_info. 579 // Need only to be sure it's the right type. 580 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 581 throwIllegalSignature( 582 "Method", name, signature, CHECK_(nullHandle)); 583 } 584 } else { 585 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 586 } 587 if (tag == JVM_CONSTANT_Methodref) { 588 // 4509014: If a class method name begins with '<', it must be "<init>". 589 assert(name != NULL, "method name in constant pool is null"); 590 unsigned int name_len = name->utf8_length(); 591 assert(name_len > 0, "bad method name"); // already verified as legal name 592 if (name->byte_at(0) == '<') { 593 if (name != vmSymbols::object_initializer_name()) { 594 classfile_parse_error( 595 "Bad method name at constant pool index %u in class file %s", 596 name_ref_index, CHECK_(nullHandle)); 597 } 598 } 599 } 600 } 601 break; 602 } 603 case JVM_CONSTANT_MethodHandle: { 604 int ref_index = cp->method_handle_index_at(index); 605 int ref_kind = cp->method_handle_ref_kind_at(index); 606 switch (ref_kind) { 607 case JVM_REF_invokeVirtual: 608 case JVM_REF_invokeStatic: 609 case JVM_REF_invokeSpecial: 610 case JVM_REF_newInvokeSpecial: 611 { 612 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 613 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 614 Symbol* name = cp->symbol_at(name_ref_index); 615 if (ref_kind == JVM_REF_newInvokeSpecial) { 616 if (name != vmSymbols::object_initializer_name()) { 617 classfile_parse_error( 618 "Bad constructor name at constant pool index %u in class file %s", 619 name_ref_index, CHECK_(nullHandle)); 620 } 621 } else { 622 if (name == vmSymbols::object_initializer_name()) { 623 classfile_parse_error( 624 "Bad method name at constant pool index %u in class file %s", 625 name_ref_index, CHECK_(nullHandle)); 626 } 627 } 628 } 629 break; 630 // Other ref_kinds are already fully checked in previous pass. 631 } 632 break; 633 } 634 case JVM_CONSTANT_MethodType: { 635 Symbol* no_name = vmSymbols::type_name(); // place holder 636 Symbol* signature = cp->method_type_signature_at(index); 637 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 638 break; 639 } 640 case JVM_CONSTANT_Utf8: { 641 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 642 } 643 } // end of switch 644 } // end of for 645 646 return cp; 647 } 648 649 650 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 651 BasicType patch_type = T_VOID; 652 653 switch (cp->tag_at(index).value()) { 654 655 case JVM_CONSTANT_UnresolvedClass : 656 // Patching a class means pre-resolving it. 657 // The name in the constant pool is ignored. 658 if (java_lang_Class::is_instance(patch())) { 659 guarantee_property(!java_lang_Class::is_primitive(patch()), 660 "Illegal class patch at %d in class file %s", 661 index, CHECK); 662 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 663 } else { 664 guarantee_property(java_lang_String::is_instance(patch()), 665 "Illegal class patch at %d in class file %s", 666 index, CHECK); 667 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 668 cp->unresolved_klass_at_put(index, name); 669 } 670 break; 671 672 case JVM_CONSTANT_String : 673 // skip this patch and don't clear it. Needs the oop array for resolved 674 // references to be created first. 675 return; 676 677 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 678 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 679 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 680 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 681 patch_prim: 682 { 683 jvalue value; 684 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 685 guarantee_property(value_type == patch_type, 686 "Illegal primitive patch at %d in class file %s", 687 index, CHECK); 688 switch (value_type) { 689 case T_INT: cp->int_at_put(index, value.i); break; 690 case T_FLOAT: cp->float_at_put(index, value.f); break; 691 case T_LONG: cp->long_at_put(index, value.j); break; 692 case T_DOUBLE: cp->double_at_put(index, value.d); break; 693 default: assert(false, ""); 694 } 695 } 696 break; 697 698 default: 699 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 700 guarantee_property(!has_cp_patch_at(index), 701 "Illegal unexpected patch at %d in class file %s", 702 index, CHECK); 703 return; 704 } 705 706 // On fall-through, mark the patch as used. 707 clear_cp_patch_at(index); 708 } 709 710 711 class NameSigHash: public ResourceObj { 712 public: 713 Symbol* _name; // name 714 Symbol* _sig; // signature 715 NameSigHash* _next; // Next entry in hash table 716 }; 717 718 719 #define HASH_ROW_SIZE 256 720 721 unsigned int hash(Symbol* name, Symbol* sig) { 722 unsigned int raw_hash = 0; 723 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 724 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 725 726 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 727 } 728 729 730 void initialize_hashtable(NameSigHash** table) { 731 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 732 } 733 734 // Return false if the name/sig combination is found in table. 735 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 736 // The old format checker uses heap sort to find duplicates. 737 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 738 // of table since we don't expect Symbol*'s to move. 739 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 740 assert(name != NULL, "name in constant pool is NULL"); 741 742 // First lookup for duplicates 743 int index = hash(name, sig); 744 NameSigHash* entry = table[index]; 745 while (entry != NULL) { 746 if (entry->_name == name && entry->_sig == sig) { 747 return false; 748 } 749 entry = entry->_next; 750 } 751 752 // No duplicate is found, allocate a new entry and fill it. 753 entry = new NameSigHash(); 754 entry->_name = name; 755 entry->_sig = sig; 756 757 // Insert into hash table 758 entry->_next = table[index]; 759 table[index] = entry; 760 761 return true; 762 } 763 764 765 Array<Klass*>* ClassFileParser::parse_interfaces(int length, 766 Handle protection_domain, 767 Symbol* class_name, 768 bool* has_default_methods, 769 TRAPS) { 770 if (length == 0) { 771 _local_interfaces = Universe::the_empty_klass_array(); 772 } else { 773 ClassFileStream* cfs = stream(); 774 assert(length > 0, "only called for length>0"); 775 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 776 777 int index; 778 for (index = 0; index < length; index++) { 779 u2 interface_index = cfs->get_u2(CHECK_NULL); 780 KlassHandle interf; 781 check_property( 782 valid_klass_reference_at(interface_index), 783 "Interface name has bad constant pool index %u in class file %s", 784 interface_index, CHECK_NULL); 785 if (_cp->tag_at(interface_index).is_klass()) { 786 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 787 } else { 788 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 789 790 // Don't need to check legal name because it's checked when parsing constant pool. 791 // But need to make sure it's not an array type. 792 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 793 "Bad interface name in class file %s", CHECK_NULL); 794 Handle class_loader(THREAD, _loader_data->class_loader()); 795 796 // Call resolve_super so classcircularity is checked 797 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 798 unresolved_klass, class_loader, protection_domain, 799 false, CHECK_NULL); 800 interf = KlassHandle(THREAD, k); 801 } 802 803 if (!interf()->is_interface()) { 804 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 805 } 806 if (InstanceKlass::cast(interf())->has_default_methods()) { 807 *has_default_methods = true; 808 } 809 _local_interfaces->at_put(index, interf()); 810 } 811 812 if (!_need_verify || length <= 1) { 813 return _local_interfaces; 814 } 815 816 // Check if there's any duplicates in interfaces 817 ResourceMark rm(THREAD); 818 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 819 THREAD, NameSigHash*, HASH_ROW_SIZE); 820 initialize_hashtable(interface_names); 821 bool dup = false; 822 { 823 debug_only(No_Safepoint_Verifier nsv;) 824 for (index = 0; index < length; index++) { 825 Klass* k = _local_interfaces->at(index); 826 Symbol* name = InstanceKlass::cast(k)->name(); 827 // If no duplicates, add (name, NULL) in hashtable interface_names. 828 if (!put_after_lookup(name, NULL, interface_names)) { 829 dup = true; 830 break; 831 } 832 } 833 } 834 if (dup) { 835 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); 836 } 837 } 838 return _local_interfaces; 839 } 840 841 842 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 843 // Make sure the constant pool entry is of a type appropriate to this field 844 guarantee_property( 845 (constantvalue_index > 0 && 846 constantvalue_index < _cp->length()), 847 "Bad initial value index %u in ConstantValue attribute in class file %s", 848 constantvalue_index, CHECK); 849 constantTag value_type = _cp->tag_at(constantvalue_index); 850 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 851 case T_LONG: 852 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 853 break; 854 case T_FLOAT: 855 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 856 break; 857 case T_DOUBLE: 858 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 859 break; 860 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 861 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 862 break; 863 case T_OBJECT: 864 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 865 && value_type.is_string()), 866 "Bad string initial value in class file %s", CHECK); 867 break; 868 default: 869 classfile_parse_error( 870 "Unable to set initial value %u in class file %s", 871 constantvalue_index, CHECK); 872 } 873 } 874 875 876 // Parse attributes for a field. 877 void ClassFileParser::parse_field_attributes(u2 attributes_count, 878 bool is_static, u2 signature_index, 879 u2* constantvalue_index_addr, 880 bool* is_synthetic_addr, 881 u2* generic_signature_index_addr, 882 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 883 TRAPS) { 884 ClassFileStream* cfs = stream(); 885 assert(attributes_count > 0, "length should be greater than 0"); 886 u2 constantvalue_index = 0; 887 u2 generic_signature_index = 0; 888 bool is_synthetic = false; 889 u1* runtime_visible_annotations = NULL; 890 int runtime_visible_annotations_length = 0; 891 u1* runtime_invisible_annotations = NULL; 892 int runtime_invisible_annotations_length = 0; 893 u1* runtime_visible_type_annotations = NULL; 894 int runtime_visible_type_annotations_length = 0; 895 u1* runtime_invisible_type_annotations = NULL; 896 int runtime_invisible_type_annotations_length = 0; 897 bool runtime_invisible_annotations_exists = false; 898 bool runtime_invisible_type_annotations_exists = false; 899 while (attributes_count--) { 900 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 901 u2 attribute_name_index = cfs->get_u2_fast(); 902 u4 attribute_length = cfs->get_u4_fast(); 903 check_property(valid_symbol_at(attribute_name_index), 904 "Invalid field attribute index %u in class file %s", 905 attribute_name_index, 906 CHECK); 907 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 908 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 909 // ignore if non-static 910 if (constantvalue_index != 0) { 911 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 912 } 913 check_property( 914 attribute_length == 2, 915 "Invalid ConstantValue field attribute length %u in class file %s", 916 attribute_length, CHECK); 917 constantvalue_index = cfs->get_u2(CHECK); 918 if (_need_verify) { 919 verify_constantvalue(constantvalue_index, signature_index, CHECK); 920 } 921 } else if (attribute_name == vmSymbols::tag_synthetic()) { 922 if (attribute_length != 0) { 923 classfile_parse_error( 924 "Invalid Synthetic field attribute length %u in class file %s", 925 attribute_length, CHECK); 926 } 927 is_synthetic = true; 928 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 929 if (attribute_length != 0) { 930 classfile_parse_error( 931 "Invalid Deprecated field attribute length %u in class file %s", 932 attribute_length, CHECK); 933 } 934 } else if (_major_version >= JAVA_1_5_VERSION) { 935 if (attribute_name == vmSymbols::tag_signature()) { 936 if (attribute_length != 2) { 937 classfile_parse_error( 938 "Wrong size %u for field's Signature attribute in class file %s", 939 attribute_length, CHECK); 940 } 941 generic_signature_index = parse_generic_signature_attribute(CHECK); 942 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 943 if (runtime_visible_annotations != NULL) { 944 classfile_parse_error( 945 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 946 } 947 runtime_visible_annotations_length = attribute_length; 948 runtime_visible_annotations = cfs->get_u1_buffer(); 949 assert(runtime_visible_annotations != NULL, "null visible annotations"); 950 parse_annotations(runtime_visible_annotations, 951 runtime_visible_annotations_length, 952 parsed_annotations, 953 CHECK); 954 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 955 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 956 if (runtime_invisible_annotations_exists) { 957 classfile_parse_error( 958 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 959 } 960 runtime_invisible_annotations_exists = true; 961 if (PreserveAllAnnotations) { 962 runtime_invisible_annotations_length = attribute_length; 963 runtime_invisible_annotations = cfs->get_u1_buffer(); 964 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 965 } 966 cfs->skip_u1(attribute_length, CHECK); 967 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 968 if (runtime_visible_type_annotations != NULL) { 969 classfile_parse_error( 970 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 971 } 972 runtime_visible_type_annotations_length = attribute_length; 973 runtime_visible_type_annotations = cfs->get_u1_buffer(); 974 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 975 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 976 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 977 if (runtime_invisible_type_annotations_exists) { 978 classfile_parse_error( 979 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 980 } else { 981 runtime_invisible_type_annotations_exists = true; 982 } 983 if (PreserveAllAnnotations) { 984 runtime_invisible_type_annotations_length = attribute_length; 985 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 986 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 987 } 988 cfs->skip_u1(attribute_length, CHECK); 989 } else { 990 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 991 } 992 } else { 993 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 994 } 995 } 996 997 *constantvalue_index_addr = constantvalue_index; 998 *is_synthetic_addr = is_synthetic; 999 *generic_signature_index_addr = generic_signature_index; 1000 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1001 runtime_visible_annotations_length, 1002 runtime_invisible_annotations, 1003 runtime_invisible_annotations_length, 1004 CHECK); 1005 parsed_annotations->set_field_annotations(a); 1006 a = assemble_annotations(runtime_visible_type_annotations, 1007 runtime_visible_type_annotations_length, 1008 runtime_invisible_type_annotations, 1009 runtime_invisible_type_annotations_length, 1010 CHECK); 1011 parsed_annotations->set_field_type_annotations(a); 1012 return; 1013 } 1014 1015 1016 // Field allocation types. Used for computing field offsets. 1017 1018 enum FieldAllocationType { 1019 STATIC_OOP, // Oops 1020 STATIC_BYTE, // Boolean, Byte, char 1021 STATIC_SHORT, // shorts 1022 STATIC_WORD, // ints 1023 STATIC_DOUBLE, // aligned long or double 1024 NONSTATIC_OOP, 1025 NONSTATIC_BYTE, 1026 NONSTATIC_SHORT, 1027 NONSTATIC_WORD, 1028 NONSTATIC_DOUBLE, 1029 MAX_FIELD_ALLOCATION_TYPE, 1030 BAD_ALLOCATION_TYPE = -1 1031 }; 1032 1033 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1034 BAD_ALLOCATION_TYPE, // 0 1035 BAD_ALLOCATION_TYPE, // 1 1036 BAD_ALLOCATION_TYPE, // 2 1037 BAD_ALLOCATION_TYPE, // 3 1038 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1039 NONSTATIC_SHORT, // T_CHAR = 5, 1040 NONSTATIC_WORD, // T_FLOAT = 6, 1041 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1042 NONSTATIC_BYTE, // T_BYTE = 8, 1043 NONSTATIC_SHORT, // T_SHORT = 9, 1044 NONSTATIC_WORD, // T_INT = 10, 1045 NONSTATIC_DOUBLE, // T_LONG = 11, 1046 NONSTATIC_OOP, // T_OBJECT = 12, 1047 NONSTATIC_OOP, // T_ARRAY = 13, 1048 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1049 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1050 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1051 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1052 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1053 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1054 BAD_ALLOCATION_TYPE, // 0 1055 BAD_ALLOCATION_TYPE, // 1 1056 BAD_ALLOCATION_TYPE, // 2 1057 BAD_ALLOCATION_TYPE, // 3 1058 STATIC_BYTE , // T_BOOLEAN = 4, 1059 STATIC_SHORT, // T_CHAR = 5, 1060 STATIC_WORD, // T_FLOAT = 6, 1061 STATIC_DOUBLE, // T_DOUBLE = 7, 1062 STATIC_BYTE, // T_BYTE = 8, 1063 STATIC_SHORT, // T_SHORT = 9, 1064 STATIC_WORD, // T_INT = 10, 1065 STATIC_DOUBLE, // T_LONG = 11, 1066 STATIC_OOP, // T_OBJECT = 12, 1067 STATIC_OOP, // T_ARRAY = 13, 1068 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1069 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1070 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1071 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1072 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1073 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1074 }; 1075 1076 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1077 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1078 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1079 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1080 return result; 1081 } 1082 1083 class FieldAllocationCount: public ResourceObj { 1084 public: 1085 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1086 1087 FieldAllocationCount() { 1088 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1089 count[i] = 0; 1090 } 1091 } 1092 1093 FieldAllocationType update(bool is_static, BasicType type) { 1094 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1095 // Make sure there is no overflow with injected fields. 1096 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1097 count[atype]++; 1098 return atype; 1099 } 1100 }; 1101 1102 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1103 bool is_interface, 1104 FieldAllocationCount *fac, 1105 u2* java_fields_count_ptr, TRAPS) { 1106 ClassFileStream* cfs = stream(); 1107 cfs->guarantee_more(2, CHECK_NULL); // length 1108 u2 length = cfs->get_u2_fast(); 1109 *java_fields_count_ptr = length; 1110 1111 int num_injected = 0; 1112 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1113 int total_fields = length + num_injected; 1114 1115 // The field array starts with tuples of shorts 1116 // [access, name index, sig index, initial value index, byte offset]. 1117 // A generic signature slot only exists for field with generic 1118 // signature attribute. And the access flag is set with 1119 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1120 // signature slots are at the end of the field array and after all 1121 // other fields data. 1122 // 1123 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1124 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1125 // ... 1126 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1127 // [generic signature index] 1128 // [generic signature index] 1129 // ... 1130 // 1131 // Allocate a temporary resource array for field data. For each field, 1132 // a slot is reserved in the temporary array for the generic signature 1133 // index. After parsing all fields, the data are copied to a permanent 1134 // array and any unused slots will be discarded. 1135 ResourceMark rm(THREAD); 1136 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1137 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1138 1139 // The generic signature slots start after all other fields' data. 1140 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1141 int num_generic_signature = 0; 1142 for (int n = 0; n < length; n++) { 1143 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1144 1145 AccessFlags access_flags; 1146 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1147 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1148 access_flags.set_flags(flags); 1149 1150 u2 name_index = cfs->get_u2_fast(); 1151 int cp_size = _cp->length(); 1152 check_property(valid_symbol_at(name_index), 1153 "Invalid constant pool index %u for field name in class file %s", 1154 name_index, 1155 CHECK_NULL); 1156 Symbol* name = _cp->symbol_at(name_index); 1157 verify_legal_field_name(name, CHECK_NULL); 1158 1159 u2 signature_index = cfs->get_u2_fast(); 1160 check_property(valid_symbol_at(signature_index), 1161 "Invalid constant pool index %u for field signature in class file %s", 1162 signature_index, CHECK_NULL); 1163 Symbol* sig = _cp->symbol_at(signature_index); 1164 verify_legal_field_signature(name, sig, CHECK_NULL); 1165 1166 u2 constantvalue_index = 0; 1167 bool is_synthetic = false; 1168 u2 generic_signature_index = 0; 1169 bool is_static = access_flags.is_static(); 1170 FieldAnnotationCollector parsed_annotations(_loader_data); 1171 1172 u2 attributes_count = cfs->get_u2_fast(); 1173 if (attributes_count > 0) { 1174 parse_field_attributes(attributes_count, is_static, signature_index, 1175 &constantvalue_index, &is_synthetic, 1176 &generic_signature_index, &parsed_annotations, 1177 CHECK_NULL); 1178 if (parsed_annotations.field_annotations() != NULL) { 1179 if (_fields_annotations == NULL) { 1180 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1181 _loader_data, length, NULL, 1182 CHECK_NULL); 1183 } 1184 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1185 parsed_annotations.set_field_annotations(NULL); 1186 } 1187 if (parsed_annotations.field_type_annotations() != NULL) { 1188 if (_fields_type_annotations == NULL) { 1189 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1190 _loader_data, length, NULL, 1191 CHECK_NULL); 1192 } 1193 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1194 parsed_annotations.set_field_type_annotations(NULL); 1195 } 1196 1197 if (is_synthetic) { 1198 access_flags.set_is_synthetic(); 1199 } 1200 if (generic_signature_index != 0) { 1201 access_flags.set_field_has_generic_signature(); 1202 fa[generic_signature_slot] = generic_signature_index; 1203 generic_signature_slot ++; 1204 num_generic_signature ++; 1205 } 1206 } 1207 1208 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1209 field->initialize(access_flags.as_short(), 1210 name_index, 1211 signature_index, 1212 constantvalue_index); 1213 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1214 1215 // Remember how many oops we encountered and compute allocation type 1216 FieldAllocationType atype = fac->update(is_static, type); 1217 field->set_allocation_type(atype); 1218 1219 // After field is initialized with type, we can augment it with aux info 1220 if (parsed_annotations.has_any_annotations()) 1221 parsed_annotations.apply_to(field); 1222 } 1223 1224 int index = length; 1225 if (num_injected != 0) { 1226 for (int n = 0; n < num_injected; n++) { 1227 // Check for duplicates 1228 if (injected[n].may_be_java) { 1229 Symbol* name = injected[n].name(); 1230 Symbol* signature = injected[n].signature(); 1231 bool duplicate = false; 1232 for (int i = 0; i < length; i++) { 1233 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1234 if (name == _cp->symbol_at(f->name_index()) && 1235 signature == _cp->symbol_at(f->signature_index())) { 1236 // Symbol is desclared in Java so skip this one 1237 duplicate = true; 1238 break; 1239 } 1240 } 1241 if (duplicate) { 1242 // These will be removed from the field array at the end 1243 continue; 1244 } 1245 } 1246 1247 // Injected field 1248 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1249 field->initialize(JVM_ACC_FIELD_INTERNAL, 1250 injected[n].name_index, 1251 injected[n].signature_index, 1252 0); 1253 1254 BasicType type = FieldType::basic_type(injected[n].signature()); 1255 1256 // Remember how many oops we encountered and compute allocation type 1257 FieldAllocationType atype = fac->update(false, type); 1258 field->set_allocation_type(atype); 1259 index++; 1260 } 1261 } 1262 1263 // Now copy the fields' data from the temporary resource array. 1264 // Sometimes injected fields already exist in the Java source so 1265 // the fields array could be too long. In that case the 1266 // fields array is trimed. Also unused slots that were reserved 1267 // for generic signature indexes are discarded. 1268 Array<u2>* fields = MetadataFactory::new_array<u2>( 1269 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1270 CHECK_NULL); 1271 _fields = fields; // save in case of error 1272 { 1273 int i = 0; 1274 for (; i < index * FieldInfo::field_slots; i++) { 1275 fields->at_put(i, fa[i]); 1276 } 1277 for (int j = total_fields * FieldInfo::field_slots; 1278 j < generic_signature_slot; j++) { 1279 fields->at_put(i++, fa[j]); 1280 } 1281 assert(i == fields->length(), ""); 1282 } 1283 1284 if (_need_verify && length > 1) { 1285 // Check duplicated fields 1286 ResourceMark rm(THREAD); 1287 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1288 THREAD, NameSigHash*, HASH_ROW_SIZE); 1289 initialize_hashtable(names_and_sigs); 1290 bool dup = false; 1291 { 1292 debug_only(No_Safepoint_Verifier nsv;) 1293 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1294 Symbol* name = fs.name(); 1295 Symbol* sig = fs.signature(); 1296 // If no duplicates, add name/signature in hashtable names_and_sigs. 1297 if (!put_after_lookup(name, sig, names_and_sigs)) { 1298 dup = true; 1299 break; 1300 } 1301 } 1302 } 1303 if (dup) { 1304 classfile_parse_error("Duplicate field name&signature in class file %s", 1305 CHECK_NULL); 1306 } 1307 } 1308 1309 return fields; 1310 } 1311 1312 1313 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1314 while (length-- > 0) { 1315 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1316 } 1317 } 1318 1319 1320 u2* ClassFileParser::parse_exception_table(u4 code_length, 1321 u4 exception_table_length, 1322 TRAPS) { 1323 ClassFileStream* cfs = stream(); 1324 1325 u2* exception_table_start = cfs->get_u2_buffer(); 1326 assert(exception_table_start != NULL, "null exception table"); 1327 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1328 // Will check legal target after parsing code array in verifier. 1329 if (_need_verify) { 1330 for (unsigned int i = 0; i < exception_table_length; i++) { 1331 u2 start_pc = cfs->get_u2_fast(); 1332 u2 end_pc = cfs->get_u2_fast(); 1333 u2 handler_pc = cfs->get_u2_fast(); 1334 u2 catch_type_index = cfs->get_u2_fast(); 1335 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1336 "Illegal exception table range in class file %s", 1337 CHECK_NULL); 1338 guarantee_property(handler_pc < code_length, 1339 "Illegal exception table handler in class file %s", 1340 CHECK_NULL); 1341 if (catch_type_index != 0) { 1342 guarantee_property(valid_klass_reference_at(catch_type_index), 1343 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1344 } 1345 } 1346 } else { 1347 cfs->skip_u2_fast(exception_table_length * 4); 1348 } 1349 return exception_table_start; 1350 } 1351 1352 void ClassFileParser::parse_linenumber_table( 1353 u4 code_attribute_length, u4 code_length, 1354 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1355 ClassFileStream* cfs = stream(); 1356 unsigned int num_entries = cfs->get_u2(CHECK); 1357 1358 // Each entry is a u2 start_pc, and a u2 line_number 1359 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1360 1361 // Verify line number attribute and table length 1362 check_property( 1363 code_attribute_length == sizeof(u2) + length_in_bytes, 1364 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1365 1366 cfs->guarantee_more(length_in_bytes, CHECK); 1367 1368 if ((*write_stream) == NULL) { 1369 if (length_in_bytes > fixed_buffer_size) { 1370 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1371 } else { 1372 (*write_stream) = new CompressedLineNumberWriteStream( 1373 linenumbertable_buffer, fixed_buffer_size); 1374 } 1375 } 1376 1377 while (num_entries-- > 0) { 1378 u2 bci = cfs->get_u2_fast(); // start_pc 1379 u2 line = cfs->get_u2_fast(); // line_number 1380 guarantee_property(bci < code_length, 1381 "Invalid pc in LineNumberTable in class file %s", CHECK); 1382 (*write_stream)->write_pair(bci, line); 1383 } 1384 } 1385 1386 1387 class LVT_Hash : public AllStatic { 1388 public: 1389 1390 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1391 /* 1392 * 3-tuple start_bci/length/slot has to be unique key, 1393 * so the following comparison seems to be redundant: 1394 * && elem->name_cp_index == entry->_elem->name_cp_index 1395 */ 1396 return (e0.start_bci == e1.start_bci && 1397 e0.length == e1.length && 1398 e0.name_cp_index == e1.name_cp_index && 1399 e0.slot == e1.slot); 1400 } 1401 1402 static unsigned int hash(LocalVariableTableElement const& e0) { 1403 unsigned int raw_hash = e0.start_bci; 1404 1405 raw_hash = e0.length + raw_hash * 37; 1406 raw_hash = e0.name_cp_index + raw_hash * 37; 1407 raw_hash = e0.slot + raw_hash * 37; 1408 1409 return raw_hash; 1410 } 1411 }; 1412 1413 1414 // Class file LocalVariableTable elements. 1415 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1416 public: 1417 u2 start_bci; 1418 u2 length; 1419 u2 name_cp_index; 1420 u2 descriptor_cp_index; 1421 u2 slot; 1422 }; 1423 1424 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1425 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1426 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1427 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1428 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1429 lvt->signature_cp_index = 0; 1430 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1431 } 1432 1433 // Function is used to parse both attributes: 1434 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1435 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1436 u2 max_locals, 1437 u4 code_attribute_length, 1438 u2* localvariable_table_length, 1439 bool isLVTT, 1440 TRAPS) { 1441 ClassFileStream* cfs = stream(); 1442 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1443 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1444 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1445 // Verify local variable table attribute has right length 1446 if (_need_verify) { 1447 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1448 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1449 } 1450 u2* localvariable_table_start = cfs->get_u2_buffer(); 1451 assert(localvariable_table_start != NULL, "null local variable table"); 1452 if (!_need_verify) { 1453 cfs->skip_u2_fast(size); 1454 } else { 1455 cfs->guarantee_more(size * 2, CHECK_NULL); 1456 for(int i = 0; i < (*localvariable_table_length); i++) { 1457 u2 start_pc = cfs->get_u2_fast(); 1458 u2 length = cfs->get_u2_fast(); 1459 u2 name_index = cfs->get_u2_fast(); 1460 u2 descriptor_index = cfs->get_u2_fast(); 1461 u2 index = cfs->get_u2_fast(); 1462 // Assign to a u4 to avoid overflow 1463 u4 end_pc = (u4)start_pc + (u4)length; 1464 1465 if (start_pc >= code_length) { 1466 classfile_parse_error( 1467 "Invalid start_pc %u in %s in class file %s", 1468 start_pc, tbl_name, CHECK_NULL); 1469 } 1470 if (end_pc > code_length) { 1471 classfile_parse_error( 1472 "Invalid length %u in %s in class file %s", 1473 length, tbl_name, CHECK_NULL); 1474 } 1475 int cp_size = _cp->length(); 1476 guarantee_property(valid_symbol_at(name_index), 1477 "Name index %u in %s has bad constant type in class file %s", 1478 name_index, tbl_name, CHECK_NULL); 1479 guarantee_property(valid_symbol_at(descriptor_index), 1480 "Signature index %u in %s has bad constant type in class file %s", 1481 descriptor_index, tbl_name, CHECK_NULL); 1482 1483 Symbol* name = _cp->symbol_at(name_index); 1484 Symbol* sig = _cp->symbol_at(descriptor_index); 1485 verify_legal_field_name(name, CHECK_NULL); 1486 u2 extra_slot = 0; 1487 if (!isLVTT) { 1488 verify_legal_field_signature(name, sig, CHECK_NULL); 1489 1490 // 4894874: check special cases for double and long local variables 1491 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1492 sig == vmSymbols::type_signature(T_LONG)) { 1493 extra_slot = 1; 1494 } 1495 } 1496 guarantee_property((index + extra_slot) < max_locals, 1497 "Invalid index %u in %s in class file %s", 1498 index, tbl_name, CHECK_NULL); 1499 } 1500 } 1501 return localvariable_table_start; 1502 } 1503 1504 1505 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1506 u1* u1_array, u2* u2_array, TRAPS) { 1507 ClassFileStream* cfs = stream(); 1508 u2 index = 0; // index in the array with long/double occupying two slots 1509 u4 i1 = *u1_index; 1510 u4 i2 = *u2_index + 1; 1511 for(int i = 0; i < array_length; i++) { 1512 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1513 index++; 1514 if (tag == ITEM_Long || tag == ITEM_Double) { 1515 index++; 1516 } else if (tag == ITEM_Object) { 1517 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1518 guarantee_property(valid_klass_reference_at(class_index), 1519 "Bad class index %u in StackMap in class file %s", 1520 class_index, CHECK); 1521 } else if (tag == ITEM_Uninitialized) { 1522 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1523 guarantee_property( 1524 offset < code_length, 1525 "Bad uninitialized type offset %u in StackMap in class file %s", 1526 offset, CHECK); 1527 } else { 1528 guarantee_property( 1529 tag <= (u1)ITEM_Uninitialized, 1530 "Unknown variable type %u in StackMap in class file %s", 1531 tag, CHECK); 1532 } 1533 } 1534 u2_array[*u2_index] = index; 1535 *u1_index = i1; 1536 *u2_index = i2; 1537 } 1538 1539 u1* ClassFileParser::parse_stackmap_table( 1540 u4 code_attribute_length, TRAPS) { 1541 if (code_attribute_length == 0) 1542 return NULL; 1543 1544 ClassFileStream* cfs = stream(); 1545 u1* stackmap_table_start = cfs->get_u1_buffer(); 1546 assert(stackmap_table_start != NULL, "null stackmap table"); 1547 1548 // check code_attribute_length first 1549 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1550 1551 if (!_need_verify && !DumpSharedSpaces) { 1552 return NULL; 1553 } 1554 return stackmap_table_start; 1555 } 1556 1557 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1558 u4 method_attribute_length, 1559 TRAPS) { 1560 ClassFileStream* cfs = stream(); 1561 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1562 *checked_exceptions_length = cfs->get_u2_fast(); 1563 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1564 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1565 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1566 if (!_need_verify) { 1567 cfs->skip_u2_fast(size); 1568 } else { 1569 // Verify each value in the checked exception table 1570 u2 checked_exception; 1571 u2 len = *checked_exceptions_length; 1572 cfs->guarantee_more(2 * len, CHECK_NULL); 1573 for (int i = 0; i < len; i++) { 1574 checked_exception = cfs->get_u2_fast(); 1575 check_property( 1576 valid_klass_reference_at(checked_exception), 1577 "Exception name has bad type at constant pool %u in class file %s", 1578 checked_exception, CHECK_NULL); 1579 } 1580 } 1581 // check exceptions attribute length 1582 if (_need_verify) { 1583 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1584 sizeof(u2) * size), 1585 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1586 } 1587 return checked_exceptions_start; 1588 } 1589 1590 void ClassFileParser::throwIllegalSignature( 1591 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1592 ResourceMark rm(THREAD); 1593 Exceptions::fthrow(THREAD_AND_LOCATION, 1594 vmSymbols::java_lang_ClassFormatError(), 1595 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1596 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1597 } 1598 1599 // Skip an annotation. Return >=limit if there is any problem. 1600 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1601 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1602 // value := switch (tag:u1) { ... } 1603 index += 2; // skip atype 1604 if ((index += 2) >= limit) return limit; // read nmem 1605 int nmem = Bytes::get_Java_u2(buffer+index-2); 1606 while (--nmem >= 0 && index < limit) { 1607 index += 2; // skip member 1608 index = skip_annotation_value(buffer, limit, index); 1609 } 1610 return index; 1611 } 1612 1613 // Skip an annotation value. Return >=limit if there is any problem. 1614 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1615 // value := switch (tag:u1) { 1616 // case B, C, I, S, Z, D, F, J, c: con:u2; 1617 // case e: e_class:u2 e_name:u2; 1618 // case s: s_con:u2; 1619 // case [: do(nval:u2) {value}; 1620 // case @: annotation; 1621 // case s: s_con:u2; 1622 // } 1623 if ((index += 1) >= limit) return limit; // read tag 1624 u1 tag = buffer[index-1]; 1625 switch (tag) { 1626 case 'B': case 'C': case 'I': case 'S': case 'Z': 1627 case 'D': case 'F': case 'J': case 'c': case 's': 1628 index += 2; // skip con or s_con 1629 break; 1630 case 'e': 1631 index += 4; // skip e_class, e_name 1632 break; 1633 case '[': 1634 { 1635 if ((index += 2) >= limit) return limit; // read nval 1636 int nval = Bytes::get_Java_u2(buffer+index-2); 1637 while (--nval >= 0 && index < limit) { 1638 index = skip_annotation_value(buffer, limit, index); 1639 } 1640 } 1641 break; 1642 case '@': 1643 index = skip_annotation(buffer, limit, index); 1644 break; 1645 default: 1646 assert(false, "annotation tag"); 1647 return limit; // bad tag byte 1648 } 1649 return index; 1650 } 1651 1652 // Sift through annotations, looking for those significant to the VM: 1653 void ClassFileParser::parse_annotations(u1* buffer, int limit, 1654 ClassFileParser::AnnotationCollector* coll, 1655 TRAPS) { 1656 // annotations := do(nann:u2) {annotation} 1657 int index = 0; 1658 if ((index += 2) >= limit) return; // read nann 1659 int nann = Bytes::get_Java_u2(buffer+index-2); 1660 enum { // initial annotation layout 1661 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1662 count_off = 2, // u2 such as 1 (one value) 1663 member_off = 4, // utf8 such as 'value' 1664 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1665 e_tag_val = 'e', 1666 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1667 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1668 e_size = 11, // end of 'e' annotation 1669 c_tag_val = 'c', // payload is type 1670 c_con_off = 7, // utf8 payload, such as 'I' 1671 c_size = 9, // end of 'c' annotation 1672 s_tag_val = 's', // payload is String 1673 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1674 s_size = 9, 1675 min_size = 6 // smallest possible size (zero members) 1676 }; 1677 while ((--nann) >= 0 && (index-2 + min_size <= limit)) { 1678 int index0 = index; 1679 index = skip_annotation(buffer, limit, index); 1680 u1* abase = buffer + index0; 1681 int atype = Bytes::get_Java_u2(abase + atype_off); 1682 int count = Bytes::get_Java_u2(abase + count_off); 1683 Symbol* aname = check_symbol_at(_cp, atype); 1684 if (aname == NULL) break; // invalid annotation name 1685 Symbol* member = NULL; 1686 if (count >= 1) { 1687 int member_index = Bytes::get_Java_u2(abase + member_off); 1688 member = check_symbol_at(_cp, member_index); 1689 if (member == NULL) break; // invalid member name 1690 } 1691 1692 // Here is where parsing particular annotations will take place. 1693 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1694 if (id == AnnotationCollector::_unknown) continue; 1695 coll->set_annotation(id); 1696 1697 if (id == AnnotationCollector::_sun_misc_Contended) { 1698 // @Contended can optionally specify the contention group. 1699 // 1700 // Contended group defines the equivalence class over the fields: 1701 // the fields within the same contended group are not treated distinct. 1702 // The only exception is default group, which does not incur the 1703 // equivalence. Naturally, contention group for classes is meaningless. 1704 // 1705 // While the contention group is specified as String, annotation 1706 // values are already interned, and we might as well use the constant 1707 // pool index as the group tag. 1708 // 1709 u2 group_index = 0; // default contended group 1710 if (count == 1 1711 && s_size == (index - index0) // match size 1712 && s_tag_val == *(abase + tag_off) 1713 && member == vmSymbols::value_name()) { 1714 group_index = Bytes::get_Java_u2(abase + s_con_off); 1715 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1716 group_index = 0; // default contended group 1717 } 1718 } 1719 coll->set_contended_group(group_index); 1720 } 1721 } 1722 } 1723 1724 ClassFileParser::AnnotationCollector::ID 1725 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1726 Symbol* name) { 1727 vmSymbols::SID sid = vmSymbols::find_sid(name); 1728 // Privileged code can use all annotations. Other code silently drops some. 1729 const bool privileged = loader_data->is_the_null_class_loader_data() || 1730 loader_data->is_ext_class_loader_data() || 1731 loader_data->is_anonymous(); 1732 switch (sid) { 1733 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1734 if (_location != _in_method) break; // only allow for methods 1735 if (!privileged) break; // only allow in privileged code 1736 return _method_CallerSensitive; 1737 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1738 if (_location != _in_method) break; // only allow for methods 1739 if (!privileged) break; // only allow in privileged code 1740 return _method_ForceInline; 1741 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1742 if (_location != _in_method) break; // only allow for methods 1743 if (!privileged) break; // only allow in privileged code 1744 return _method_DontInline; 1745 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1746 if (_location != _in_method) break; // only allow for methods 1747 if (!privileged) break; // only allow in privileged code 1748 return _method_LambdaForm_Compiled; 1749 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1750 if (_location != _in_method) break; // only allow for methods 1751 if (!privileged) break; // only allow in privileged code 1752 return _method_LambdaForm_Hidden; 1753 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): 1754 if (_location != _in_field) break; // only allow for fields 1755 if (!privileged) break; // only allow in privileged code 1756 return _field_Stable; 1757 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1758 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1759 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1760 return _sun_misc_Contended; 1761 default: break; 1762 } 1763 return AnnotationCollector::_unknown; 1764 } 1765 1766 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1767 if (is_contended()) 1768 f->set_contended_group(contended_group()); 1769 if (is_stable()) 1770 f->set_stable(true); 1771 } 1772 1773 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1774 // If there's an error deallocate metadata for field annotations 1775 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1776 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1777 } 1778 1779 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1780 if (has_annotation(_method_CallerSensitive)) 1781 m->set_caller_sensitive(true); 1782 if (has_annotation(_method_ForceInline)) 1783 m->set_force_inline(true); 1784 if (has_annotation(_method_DontInline)) 1785 m->set_dont_inline(true); 1786 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1787 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1788 if (has_annotation(_method_LambdaForm_Hidden)) 1789 m->set_hidden(true); 1790 } 1791 1792 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1793 k->set_is_contended(is_contended()); 1794 } 1795 1796 1797 #define MAX_ARGS_SIZE 255 1798 #define MAX_CODE_SIZE 65535 1799 #define INITIAL_MAX_LVT_NUMBER 256 1800 1801 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1802 * 1803 * Rules for LVT's and LVTT's are: 1804 * - There can be any number of LVT's and LVTT's. 1805 * - If there are n LVT's, it is the same as if there was just 1806 * one LVT containing all the entries from the n LVT's. 1807 * - There may be no more than one LVT entry per local variable. 1808 * Two LVT entries are 'equal' if these fields are the same: 1809 * start_pc, length, name, slot 1810 * - There may be no more than one LVTT entry per each LVT entry. 1811 * Each LVTT entry has to match some LVT entry. 1812 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1813 */ 1814 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1815 int lvt_cnt, 1816 u2* localvariable_table_length, 1817 u2** localvariable_table_start, 1818 int lvtt_cnt, 1819 u2* localvariable_type_table_length, 1820 u2** localvariable_type_table_start, 1821 TRAPS) { 1822 1823 ResourceMark rm(THREAD); 1824 1825 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 1826 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 1827 1828 LVT_HashTable* table = new LVT_HashTable(); 1829 1830 // To fill LocalVariableTable in 1831 Classfile_LVT_Element* cf_lvt; 1832 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1833 1834 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1835 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1836 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1837 copy_lvt_element(&cf_lvt[idx], lvt); 1838 // If no duplicates, add LVT elem in hashtable. 1839 if (table->put(*lvt, lvt) == false 1840 && _need_verify 1841 && _major_version >= JAVA_1_5_VERSION) { 1842 classfile_parse_error("Duplicated LocalVariableTable attribute " 1843 "entry for '%s' in class file %s", 1844 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1845 CHECK); 1846 } 1847 } 1848 } 1849 1850 // To merge LocalVariableTable and LocalVariableTypeTable 1851 Classfile_LVT_Element* cf_lvtt; 1852 LocalVariableTableElement lvtt_elem; 1853 1854 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1855 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1856 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1857 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1858 LocalVariableTableElement** entry = table->get(lvtt_elem); 1859 if (entry == NULL) { 1860 if (_need_verify) { 1861 classfile_parse_error("LVTT entry for '%s' in class file %s " 1862 "does not match any LVT entry", 1863 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1864 CHECK); 1865 } 1866 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 1867 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1868 "entry for '%s' in class file %s", 1869 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1870 CHECK); 1871 } else { 1872 // to add generic signatures into LocalVariableTable 1873 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 1874 } 1875 } 1876 } 1877 } 1878 1879 1880 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1881 u1* runtime_visible_annotations, 1882 int runtime_visible_annotations_length, 1883 u1* runtime_invisible_annotations, 1884 int runtime_invisible_annotations_length, 1885 u1* runtime_visible_parameter_annotations, 1886 int runtime_visible_parameter_annotations_length, 1887 u1* runtime_invisible_parameter_annotations, 1888 int runtime_invisible_parameter_annotations_length, 1889 u1* runtime_visible_type_annotations, 1890 int runtime_visible_type_annotations_length, 1891 u1* runtime_invisible_type_annotations, 1892 int runtime_invisible_type_annotations_length, 1893 u1* annotation_default, 1894 int annotation_default_length, 1895 TRAPS) { 1896 1897 AnnotationArray* a; 1898 1899 if (runtime_visible_annotations_length + 1900 runtime_invisible_annotations_length > 0) { 1901 a = assemble_annotations(runtime_visible_annotations, 1902 runtime_visible_annotations_length, 1903 runtime_invisible_annotations, 1904 runtime_invisible_annotations_length, 1905 CHECK); 1906 cm->set_method_annotations(a); 1907 } 1908 1909 if (runtime_visible_parameter_annotations_length + 1910 runtime_invisible_parameter_annotations_length > 0) { 1911 a = assemble_annotations(runtime_visible_parameter_annotations, 1912 runtime_visible_parameter_annotations_length, 1913 runtime_invisible_parameter_annotations, 1914 runtime_invisible_parameter_annotations_length, 1915 CHECK); 1916 cm->set_parameter_annotations(a); 1917 } 1918 1919 if (annotation_default_length > 0) { 1920 a = assemble_annotations(annotation_default, 1921 annotation_default_length, 1922 NULL, 1923 0, 1924 CHECK); 1925 cm->set_default_annotations(a); 1926 } 1927 1928 if (runtime_visible_type_annotations_length + 1929 runtime_invisible_type_annotations_length > 0) { 1930 a = assemble_annotations(runtime_visible_type_annotations, 1931 runtime_visible_type_annotations_length, 1932 runtime_invisible_type_annotations, 1933 runtime_invisible_type_annotations_length, 1934 CHECK); 1935 cm->set_type_annotations(a); 1936 } 1937 } 1938 1939 1940 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1941 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1942 // Method* to save footprint, so we only know the size of the resulting Method* when the 1943 // entire method attribute is parsed. 1944 // 1945 // The promoted_flags parameter is used to pass relevant access_flags 1946 // from the method back up to the containing klass. These flag values 1947 // are added to klass's access_flags. 1948 1949 methodHandle ClassFileParser::parse_method(bool is_interface, 1950 AccessFlags *promoted_flags, 1951 TRAPS) { 1952 ClassFileStream* cfs = stream(); 1953 methodHandle nullHandle; 1954 ResourceMark rm(THREAD); 1955 // Parse fixed parts 1956 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1957 1958 int flags = cfs->get_u2_fast(); 1959 u2 name_index = cfs->get_u2_fast(); 1960 int cp_size = _cp->length(); 1961 check_property( 1962 valid_symbol_at(name_index), 1963 "Illegal constant pool index %u for method name in class file %s", 1964 name_index, CHECK_(nullHandle)); 1965 Symbol* name = _cp->symbol_at(name_index); 1966 verify_legal_method_name(name, CHECK_(nullHandle)); 1967 1968 u2 signature_index = cfs->get_u2_fast(); 1969 guarantee_property( 1970 valid_symbol_at(signature_index), 1971 "Illegal constant pool index %u for method signature in class file %s", 1972 signature_index, CHECK_(nullHandle)); 1973 Symbol* signature = _cp->symbol_at(signature_index); 1974 1975 AccessFlags access_flags; 1976 if (name == vmSymbols::class_initializer_name()) { 1977 // We ignore the other access flags for a valid class initializer. 1978 // (JVM Spec 2nd ed., chapter 4.6) 1979 if (_major_version < 51) { // backward compatibility 1980 flags = JVM_ACC_STATIC; 1981 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 1982 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 1983 } 1984 } else { 1985 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 1986 } 1987 1988 int args_size = -1; // only used when _need_verify is true 1989 if (_need_verify) { 1990 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 1991 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 1992 if (args_size > MAX_ARGS_SIZE) { 1993 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 1994 } 1995 } 1996 1997 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 1998 1999 // Default values for code and exceptions attribute elements 2000 u2 max_stack = 0; 2001 u2 max_locals = 0; 2002 u4 code_length = 0; 2003 u1* code_start = 0; 2004 u2 exception_table_length = 0; 2005 u2* exception_table_start = NULL; 2006 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2007 u2 checked_exceptions_length = 0; 2008 u2* checked_exceptions_start = NULL; 2009 CompressedLineNumberWriteStream* linenumber_table = NULL; 2010 int linenumber_table_length = 0; 2011 int total_lvt_length = 0; 2012 u2 lvt_cnt = 0; 2013 u2 lvtt_cnt = 0; 2014 bool lvt_allocated = false; 2015 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2016 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2017 u2* localvariable_table_length; 2018 u2** localvariable_table_start; 2019 u2* localvariable_type_table_length; 2020 u2** localvariable_type_table_start; 2021 int method_parameters_length = -1; 2022 u1* method_parameters_data = NULL; 2023 bool method_parameters_seen = false; 2024 bool parsed_code_attribute = false; 2025 bool parsed_checked_exceptions_attribute = false; 2026 bool parsed_stackmap_attribute = false; 2027 // stackmap attribute - JDK1.5 2028 u1* stackmap_data = NULL; 2029 int stackmap_data_length = 0; 2030 u2 generic_signature_index = 0; 2031 MethodAnnotationCollector parsed_annotations; 2032 u1* runtime_visible_annotations = NULL; 2033 int runtime_visible_annotations_length = 0; 2034 u1* runtime_invisible_annotations = NULL; 2035 int runtime_invisible_annotations_length = 0; 2036 u1* runtime_visible_parameter_annotations = NULL; 2037 int runtime_visible_parameter_annotations_length = 0; 2038 u1* runtime_invisible_parameter_annotations = NULL; 2039 int runtime_invisible_parameter_annotations_length = 0; 2040 u1* runtime_visible_type_annotations = NULL; 2041 int runtime_visible_type_annotations_length = 0; 2042 u1* runtime_invisible_type_annotations = NULL; 2043 int runtime_invisible_type_annotations_length = 0; 2044 bool runtime_invisible_annotations_exists = false; 2045 bool runtime_invisible_type_annotations_exists = false; 2046 bool runtime_invisible_parameter_annotations_exists = false; 2047 u1* annotation_default = NULL; 2048 int annotation_default_length = 0; 2049 2050 // Parse code and exceptions attribute 2051 u2 method_attributes_count = cfs->get_u2_fast(); 2052 while (method_attributes_count--) { 2053 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2054 u2 method_attribute_name_index = cfs->get_u2_fast(); 2055 u4 method_attribute_length = cfs->get_u4_fast(); 2056 check_property( 2057 valid_symbol_at(method_attribute_name_index), 2058 "Invalid method attribute name index %u in class file %s", 2059 method_attribute_name_index, CHECK_(nullHandle)); 2060 2061 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2062 if (method_attribute_name == vmSymbols::tag_code()) { 2063 // Parse Code attribute 2064 if (_need_verify) { 2065 guarantee_property( 2066 !access_flags.is_native() && !access_flags.is_abstract(), 2067 "Code attribute in native or abstract methods in class file %s", 2068 CHECK_(nullHandle)); 2069 } 2070 if (parsed_code_attribute) { 2071 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2072 } 2073 parsed_code_attribute = true; 2074 2075 // Stack size, locals size, and code size 2076 if (_major_version == 45 && _minor_version <= 2) { 2077 cfs->guarantee_more(4, CHECK_(nullHandle)); 2078 max_stack = cfs->get_u1_fast(); 2079 max_locals = cfs->get_u1_fast(); 2080 code_length = cfs->get_u2_fast(); 2081 } else { 2082 cfs->guarantee_more(8, CHECK_(nullHandle)); 2083 max_stack = cfs->get_u2_fast(); 2084 max_locals = cfs->get_u2_fast(); 2085 code_length = cfs->get_u4_fast(); 2086 } 2087 if (_need_verify) { 2088 guarantee_property(args_size <= max_locals, 2089 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2090 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2091 "Invalid method Code length %u in class file %s", 2092 code_length, CHECK_(nullHandle)); 2093 } 2094 // Code pointer 2095 code_start = cfs->get_u1_buffer(); 2096 assert(code_start != NULL, "null code start"); 2097 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2098 cfs->skip_u1_fast(code_length); 2099 2100 // Exception handler table 2101 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2102 exception_table_length = cfs->get_u2_fast(); 2103 if (exception_table_length > 0) { 2104 exception_table_start = 2105 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2106 } 2107 2108 // Parse additional attributes in code attribute 2109 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2110 u2 code_attributes_count = cfs->get_u2_fast(); 2111 2112 unsigned int calculated_attribute_length = 0; 2113 2114 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2115 calculated_attribute_length = 2116 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2117 } else { 2118 // max_stack, locals and length are smaller in pre-version 45.2 classes 2119 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2120 } 2121 calculated_attribute_length += 2122 code_length + 2123 sizeof(exception_table_length) + 2124 sizeof(code_attributes_count) + 2125 exception_table_length * 2126 ( sizeof(u2) + // start_pc 2127 sizeof(u2) + // end_pc 2128 sizeof(u2) + // handler_pc 2129 sizeof(u2) ); // catch_type_index 2130 2131 while (code_attributes_count--) { 2132 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2133 u2 code_attribute_name_index = cfs->get_u2_fast(); 2134 u4 code_attribute_length = cfs->get_u4_fast(); 2135 calculated_attribute_length += code_attribute_length + 2136 sizeof(code_attribute_name_index) + 2137 sizeof(code_attribute_length); 2138 check_property(valid_symbol_at(code_attribute_name_index), 2139 "Invalid code attribute name index %u in class file %s", 2140 code_attribute_name_index, 2141 CHECK_(nullHandle)); 2142 if (LoadLineNumberTables && 2143 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2144 // Parse and compress line number table 2145 parse_linenumber_table(code_attribute_length, code_length, 2146 &linenumber_table, CHECK_(nullHandle)); 2147 2148 } else if (LoadLocalVariableTables && 2149 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2150 // Parse local variable table 2151 if (!lvt_allocated) { 2152 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2153 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2154 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2155 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2156 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2157 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2158 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2159 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2160 lvt_allocated = true; 2161 } 2162 if (lvt_cnt == max_lvt_cnt) { 2163 max_lvt_cnt <<= 1; 2164 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2165 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2166 } 2167 localvariable_table_start[lvt_cnt] = 2168 parse_localvariable_table(code_length, 2169 max_locals, 2170 code_attribute_length, 2171 &localvariable_table_length[lvt_cnt], 2172 false, // is not LVTT 2173 CHECK_(nullHandle)); 2174 total_lvt_length += localvariable_table_length[lvt_cnt]; 2175 lvt_cnt++; 2176 } else if (LoadLocalVariableTypeTables && 2177 _major_version >= JAVA_1_5_VERSION && 2178 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2179 if (!lvt_allocated) { 2180 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2181 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2182 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2183 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2184 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2185 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2186 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2187 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2188 lvt_allocated = true; 2189 } 2190 // Parse local variable type table 2191 if (lvtt_cnt == max_lvtt_cnt) { 2192 max_lvtt_cnt <<= 1; 2193 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2194 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2195 } 2196 localvariable_type_table_start[lvtt_cnt] = 2197 parse_localvariable_table(code_length, 2198 max_locals, 2199 code_attribute_length, 2200 &localvariable_type_table_length[lvtt_cnt], 2201 true, // is LVTT 2202 CHECK_(nullHandle)); 2203 lvtt_cnt++; 2204 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2205 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2206 // Stack map is only needed by the new verifier in JDK1.5. 2207 if (parsed_stackmap_attribute) { 2208 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2209 } 2210 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2211 stackmap_data_length = code_attribute_length; 2212 parsed_stackmap_attribute = true; 2213 } else { 2214 // Skip unknown attributes 2215 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2216 } 2217 } 2218 // check method attribute length 2219 if (_need_verify) { 2220 guarantee_property(method_attribute_length == calculated_attribute_length, 2221 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2222 } 2223 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2224 // Parse Exceptions attribute 2225 if (parsed_checked_exceptions_attribute) { 2226 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2227 } 2228 parsed_checked_exceptions_attribute = true; 2229 checked_exceptions_start = 2230 parse_checked_exceptions(&checked_exceptions_length, 2231 method_attribute_length, 2232 CHECK_(nullHandle)); 2233 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2234 // reject multiple method parameters 2235 if (method_parameters_seen) { 2236 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2237 } 2238 method_parameters_seen = true; 2239 method_parameters_length = cfs->get_u1_fast(); 2240 const u2 real_length = (method_parameters_length * 4u) + 1u; 2241 if (method_attribute_length != real_length) { 2242 classfile_parse_error( 2243 "Invalid MethodParameters method attribute length %u in class file", 2244 method_attribute_length, CHECK_(nullHandle)); 2245 } 2246 method_parameters_data = cfs->get_u1_buffer(); 2247 cfs->skip_u2_fast(method_parameters_length); 2248 cfs->skip_u2_fast(method_parameters_length); 2249 // ignore this attribute if it cannot be reflected 2250 if (!SystemDictionary::Parameter_klass_loaded()) 2251 method_parameters_length = -1; 2252 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2253 if (method_attribute_length != 0) { 2254 classfile_parse_error( 2255 "Invalid Synthetic method attribute length %u in class file %s", 2256 method_attribute_length, CHECK_(nullHandle)); 2257 } 2258 // Should we check that there hasn't already been a synthetic attribute? 2259 access_flags.set_is_synthetic(); 2260 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2261 if (method_attribute_length != 0) { 2262 classfile_parse_error( 2263 "Invalid Deprecated method attribute length %u in class file %s", 2264 method_attribute_length, CHECK_(nullHandle)); 2265 } 2266 } else if (_major_version >= JAVA_1_5_VERSION) { 2267 if (method_attribute_name == vmSymbols::tag_signature()) { 2268 if (method_attribute_length != 2) { 2269 classfile_parse_error( 2270 "Invalid Signature attribute length %u in class file %s", 2271 method_attribute_length, CHECK_(nullHandle)); 2272 } 2273 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); 2274 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2275 if (runtime_visible_annotations != NULL) { 2276 classfile_parse_error( 2277 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2278 } 2279 runtime_visible_annotations_length = method_attribute_length; 2280 runtime_visible_annotations = cfs->get_u1_buffer(); 2281 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2282 parse_annotations(runtime_visible_annotations, 2283 runtime_visible_annotations_length, &parsed_annotations, 2284 CHECK_(nullHandle)); 2285 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2286 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2287 if (runtime_invisible_annotations_exists) { 2288 classfile_parse_error( 2289 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2290 } 2291 runtime_invisible_annotations_exists = true; 2292 if (PreserveAllAnnotations) { 2293 runtime_invisible_annotations_length = method_attribute_length; 2294 runtime_invisible_annotations = cfs->get_u1_buffer(); 2295 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2296 } 2297 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2298 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2299 if (runtime_visible_parameter_annotations != NULL) { 2300 classfile_parse_error( 2301 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2302 } 2303 runtime_visible_parameter_annotations_length = method_attribute_length; 2304 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2305 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2306 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2307 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2308 if (runtime_invisible_parameter_annotations_exists) { 2309 classfile_parse_error( 2310 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2311 } 2312 runtime_invisible_parameter_annotations_exists = true; 2313 if (PreserveAllAnnotations) { 2314 runtime_invisible_parameter_annotations_length = method_attribute_length; 2315 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2316 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2317 } 2318 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2319 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2320 if (annotation_default != NULL) { 2321 classfile_parse_error( 2322 "Multiple AnnotationDefault attributes for method in class file %s", 2323 CHECK_(nullHandle)); 2324 } 2325 annotation_default_length = method_attribute_length; 2326 annotation_default = cfs->get_u1_buffer(); 2327 assert(annotation_default != NULL, "null annotation default"); 2328 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2329 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2330 if (runtime_visible_type_annotations != NULL) { 2331 classfile_parse_error( 2332 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2333 CHECK_(nullHandle)); 2334 } 2335 runtime_visible_type_annotations_length = method_attribute_length; 2336 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2337 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2338 // No need for the VM to parse Type annotations 2339 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2340 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2341 if (runtime_invisible_type_annotations_exists) { 2342 classfile_parse_error( 2343 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2344 CHECK_(nullHandle)); 2345 } else { 2346 runtime_invisible_type_annotations_exists = true; 2347 } 2348 if (PreserveAllAnnotations) { 2349 runtime_invisible_type_annotations_length = method_attribute_length; 2350 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2351 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2352 } 2353 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2354 } else { 2355 // Skip unknown attributes 2356 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2357 } 2358 } else { 2359 // Skip unknown attributes 2360 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2361 } 2362 } 2363 2364 if (linenumber_table != NULL) { 2365 linenumber_table->write_terminator(); 2366 linenumber_table_length = linenumber_table->position(); 2367 } 2368 2369 // Make sure there's at least one Code attribute in non-native/non-abstract method 2370 if (_need_verify) { 2371 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2372 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2373 } 2374 2375 // All sizing information for a Method* is finally available, now create it 2376 InlineTableSizes sizes( 2377 total_lvt_length, 2378 linenumber_table_length, 2379 exception_table_length, 2380 checked_exceptions_length, 2381 method_parameters_length, 2382 generic_signature_index, 2383 runtime_visible_annotations_length + 2384 runtime_invisible_annotations_length, 2385 runtime_visible_parameter_annotations_length + 2386 runtime_invisible_parameter_annotations_length, 2387 runtime_visible_type_annotations_length + 2388 runtime_invisible_type_annotations_length, 2389 annotation_default_length, 2390 0); 2391 2392 Method* m = Method::allocate( 2393 _loader_data, code_length, access_flags, &sizes, 2394 ConstMethod::NORMAL, CHECK_(nullHandle)); 2395 2396 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2397 2398 // Fill in information from fixed part (access_flags already set) 2399 m->set_constants(_cp); 2400 m->set_name_index(name_index); 2401 m->set_signature_index(signature_index); 2402 #ifdef CC_INTERP 2403 // hmm is there a gc issue here?? 2404 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2405 m->set_result_index(rtf.type()); 2406 #endif 2407 2408 if (args_size >= 0) { 2409 m->set_size_of_parameters(args_size); 2410 } else { 2411 m->compute_size_of_parameters(THREAD); 2412 } 2413 #ifdef ASSERT 2414 if (args_size >= 0) { 2415 m->compute_size_of_parameters(THREAD); 2416 assert(args_size == m->size_of_parameters(), ""); 2417 } 2418 #endif 2419 2420 // Fill in code attribute information 2421 m->set_max_stack(max_stack); 2422 m->set_max_locals(max_locals); 2423 if (stackmap_data != NULL) { 2424 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2425 stackmap_data_length, CHECK_NULL); 2426 } 2427 2428 // Copy byte codes 2429 m->set_code(code_start); 2430 2431 // Copy line number table 2432 if (linenumber_table != NULL) { 2433 memcpy(m->compressed_linenumber_table(), 2434 linenumber_table->buffer(), linenumber_table_length); 2435 } 2436 2437 // Copy exception table 2438 if (exception_table_length > 0) { 2439 int size = 2440 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2441 copy_u2_with_conversion((u2*) m->exception_table_start(), 2442 exception_table_start, size); 2443 } 2444 2445 // Copy method parameters 2446 if (method_parameters_length > 0) { 2447 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2448 for (int i = 0; i < method_parameters_length; i++) { 2449 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2450 method_parameters_data += 2; 2451 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2452 method_parameters_data += 2; 2453 } 2454 } 2455 2456 // Copy checked exceptions 2457 if (checked_exceptions_length > 0) { 2458 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2459 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2460 } 2461 2462 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2463 if (total_lvt_length > 0) { 2464 promoted_flags->set_has_localvariable_table(); 2465 copy_localvariable_table(m->constMethod(), lvt_cnt, 2466 localvariable_table_length, 2467 localvariable_table_start, 2468 lvtt_cnt, 2469 localvariable_type_table_length, 2470 localvariable_type_table_start, CHECK_NULL); 2471 } 2472 2473 if (parsed_annotations.has_any_annotations()) 2474 parsed_annotations.apply_to(m); 2475 2476 // Copy annotations 2477 copy_method_annotations(m->constMethod(), 2478 runtime_visible_annotations, 2479 runtime_visible_annotations_length, 2480 runtime_invisible_annotations, 2481 runtime_invisible_annotations_length, 2482 runtime_visible_parameter_annotations, 2483 runtime_visible_parameter_annotations_length, 2484 runtime_invisible_parameter_annotations, 2485 runtime_invisible_parameter_annotations_length, 2486 runtime_visible_type_annotations, 2487 runtime_visible_type_annotations_length, 2488 runtime_invisible_type_annotations, 2489 runtime_invisible_type_annotations_length, 2490 annotation_default, 2491 annotation_default_length, 2492 CHECK_NULL); 2493 2494 if (name == vmSymbols::finalize_method_name() && 2495 signature == vmSymbols::void_method_signature()) { 2496 if (m->is_empty_method()) { 2497 _has_empty_finalizer = true; 2498 } else { 2499 _has_finalizer = true; 2500 } 2501 } 2502 if (name == vmSymbols::object_initializer_name() && 2503 signature == vmSymbols::void_method_signature() && 2504 m->is_vanilla_constructor()) { 2505 _has_vanilla_constructor = true; 2506 } 2507 2508 NOT_PRODUCT(m->verify()); 2509 return m; 2510 } 2511 2512 2513 // The promoted_flags parameter is used to pass relevant access_flags 2514 // from the methods back up to the containing klass. These flag values 2515 // are added to klass's access_flags. 2516 2517 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2518 AccessFlags* promoted_flags, 2519 bool* has_final_method, 2520 bool* declares_default_methods, 2521 TRAPS) { 2522 ClassFileStream* cfs = stream(); 2523 cfs->guarantee_more(2, CHECK_NULL); // length 2524 u2 length = cfs->get_u2_fast(); 2525 if (length == 0) { 2526 _methods = Universe::the_empty_method_array(); 2527 } else { 2528 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2529 2530 HandleMark hm(THREAD); 2531 for (int index = 0; index < length; index++) { 2532 methodHandle method = parse_method(is_interface, 2533 promoted_flags, 2534 CHECK_NULL); 2535 2536 if (method->is_final()) { 2537 *has_final_method = true; 2538 } 2539 // declares_default_methods: declares concrete instance methods, any access flags 2540 // used for interface initialization, and default method inheritance analysis 2541 if (is_interface && !(*declares_default_methods) 2542 && !method->is_abstract() && !method->is_static()) { 2543 *declares_default_methods = true; 2544 } 2545 _methods->at_put(index, method()); 2546 } 2547 2548 if (_need_verify && length > 1) { 2549 // Check duplicated methods 2550 ResourceMark rm(THREAD); 2551 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2552 THREAD, NameSigHash*, HASH_ROW_SIZE); 2553 initialize_hashtable(names_and_sigs); 2554 bool dup = false; 2555 { 2556 debug_only(No_Safepoint_Verifier nsv;) 2557 for (int i = 0; i < length; i++) { 2558 Method* m = _methods->at(i); 2559 // If no duplicates, add name/signature in hashtable names_and_sigs. 2560 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2561 dup = true; 2562 break; 2563 } 2564 } 2565 } 2566 if (dup) { 2567 classfile_parse_error("Duplicate method name&signature in class file %s", 2568 CHECK_NULL); 2569 } 2570 } 2571 } 2572 return _methods; 2573 } 2574 2575 2576 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2577 int length = methods->length(); 2578 // If JVMTI original method ordering or sharing is enabled we have to 2579 // remember the original class file ordering. 2580 // We temporarily use the vtable_index field in the Method* to store the 2581 // class file index, so we can read in after calling qsort. 2582 // Put the method ordering in the shared archive. 2583 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2584 for (int index = 0; index < length; index++) { 2585 Method* m = methods->at(index); 2586 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2587 m->set_vtable_index(index); 2588 } 2589 } 2590 // Sort method array by ascending method name (for faster lookups & vtable construction) 2591 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2592 Method::sort_methods(methods); 2593 2594 intArray* method_ordering = NULL; 2595 // If JVMTI original method ordering or sharing is enabled construct int 2596 // array remembering the original ordering 2597 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2598 method_ordering = new intArray(length); 2599 for (int index = 0; index < length; index++) { 2600 Method* m = methods->at(index); 2601 int old_index = m->vtable_index(); 2602 assert(old_index >= 0 && old_index < length, "invalid method index"); 2603 method_ordering->at_put(index, old_index); 2604 m->set_vtable_index(Method::invalid_vtable_index); 2605 } 2606 } 2607 return method_ordering; 2608 } 2609 2610 // Parse generic_signature attribute for methods and fields 2611 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { 2612 ClassFileStream* cfs = stream(); 2613 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2614 u2 generic_signature_index = cfs->get_u2_fast(); 2615 check_property( 2616 valid_symbol_at(generic_signature_index), 2617 "Invalid Signature attribute at constant pool index %u in class file %s", 2618 generic_signature_index, CHECK_0); 2619 return generic_signature_index; 2620 } 2621 2622 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2623 ClassFileStream* cfs = stream(); 2624 cfs->guarantee_more(2, CHECK); // sourcefile_index 2625 u2 sourcefile_index = cfs->get_u2_fast(); 2626 check_property( 2627 valid_symbol_at(sourcefile_index), 2628 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2629 sourcefile_index, CHECK); 2630 set_class_sourcefile_index(sourcefile_index); 2631 } 2632 2633 2634 2635 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2636 ClassFileStream* cfs = stream(); 2637 u1* sde_buffer = cfs->get_u1_buffer(); 2638 assert(sde_buffer != NULL, "null sde buffer"); 2639 2640 // Don't bother storing it if there is no way to retrieve it 2641 if (JvmtiExport::can_get_source_debug_extension()) { 2642 assert((length+1) > length, "Overflow checking"); 2643 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2644 for (int i = 0; i < length; i++) { 2645 sde[i] = sde_buffer[i]; 2646 } 2647 sde[length] = '\0'; 2648 set_class_sde_buffer((char*)sde, length); 2649 } 2650 // Got utf8 string, set stream position forward 2651 cfs->skip_u1(length, CHECK); 2652 } 2653 2654 2655 // Inner classes can be static, private or protected (classic VM does this) 2656 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2657 2658 // Return number of classes in the inner classes attribute table 2659 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2660 bool parsed_enclosingmethod_attribute, 2661 u2 enclosing_method_class_index, 2662 u2 enclosing_method_method_index, 2663 TRAPS) { 2664 ClassFileStream* cfs = stream(); 2665 u1* current_mark = cfs->current(); 2666 u2 length = 0; 2667 if (inner_classes_attribute_start != NULL) { 2668 cfs->set_current(inner_classes_attribute_start); 2669 cfs->guarantee_more(2, CHECK_0); // length 2670 length = cfs->get_u2_fast(); 2671 } 2672 2673 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2674 // method data: 2675 // [inner_class_info_index, 2676 // outer_class_info_index, 2677 // inner_name_index, 2678 // inner_class_access_flags, 2679 // ... 2680 // enclosing_method_class_index, 2681 // enclosing_method_method_index] 2682 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2683 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2684 _inner_classes = inner_classes; 2685 2686 int index = 0; 2687 int cp_size = _cp->length(); 2688 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2689 for (int n = 0; n < length; n++) { 2690 // Inner class index 2691 u2 inner_class_info_index = cfs->get_u2_fast(); 2692 check_property( 2693 inner_class_info_index == 0 || 2694 valid_klass_reference_at(inner_class_info_index), 2695 "inner_class_info_index %u has bad constant type in class file %s", 2696 inner_class_info_index, CHECK_0); 2697 // Outer class index 2698 u2 outer_class_info_index = cfs->get_u2_fast(); 2699 check_property( 2700 outer_class_info_index == 0 || 2701 valid_klass_reference_at(outer_class_info_index), 2702 "outer_class_info_index %u has bad constant type in class file %s", 2703 outer_class_info_index, CHECK_0); 2704 // Inner class name 2705 u2 inner_name_index = cfs->get_u2_fast(); 2706 check_property( 2707 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2708 "inner_name_index %u has bad constant type in class file %s", 2709 inner_name_index, CHECK_0); 2710 if (_need_verify) { 2711 guarantee_property(inner_class_info_index != outer_class_info_index, 2712 "Class is both outer and inner class in class file %s", CHECK_0); 2713 } 2714 // Access flags 2715 AccessFlags inner_access_flags; 2716 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2717 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2718 // Set abstract bit for old class files for backward compatibility 2719 flags |= JVM_ACC_ABSTRACT; 2720 } 2721 verify_legal_class_modifiers(flags, CHECK_0); 2722 inner_access_flags.set_flags(flags); 2723 2724 inner_classes->at_put(index++, inner_class_info_index); 2725 inner_classes->at_put(index++, outer_class_info_index); 2726 inner_classes->at_put(index++, inner_name_index); 2727 inner_classes->at_put(index++, inner_access_flags.as_short()); 2728 } 2729 2730 // 4347400: make sure there's no duplicate entry in the classes array 2731 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2732 for(int i = 0; i < length * 4; i += 4) { 2733 for(int j = i + 4; j < length * 4; j += 4) { 2734 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2735 inner_classes->at(i+1) != inner_classes->at(j+1) || 2736 inner_classes->at(i+2) != inner_classes->at(j+2) || 2737 inner_classes->at(i+3) != inner_classes->at(j+3)), 2738 "Duplicate entry in InnerClasses in class file %s", 2739 CHECK_0); 2740 } 2741 } 2742 } 2743 2744 // Set EnclosingMethod class and method indexes. 2745 if (parsed_enclosingmethod_attribute) { 2746 inner_classes->at_put(index++, enclosing_method_class_index); 2747 inner_classes->at_put(index++, enclosing_method_method_index); 2748 } 2749 assert(index == size, "wrong size"); 2750 2751 // Restore buffer's current position. 2752 cfs->set_current(current_mark); 2753 2754 return length; 2755 } 2756 2757 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2758 set_class_synthetic_flag(true); 2759 } 2760 2761 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2762 ClassFileStream* cfs = stream(); 2763 u2 signature_index = cfs->get_u2(CHECK); 2764 check_property( 2765 valid_symbol_at(signature_index), 2766 "Invalid constant pool index %u in Signature attribute in class file %s", 2767 signature_index, CHECK); 2768 set_class_generic_signature_index(signature_index); 2769 } 2770 2771 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2772 ClassFileStream* cfs = stream(); 2773 u1* current_start = cfs->current(); 2774 2775 guarantee_property(attribute_byte_length >= sizeof(u2), 2776 "Invalid BootstrapMethods attribute length %u in class file %s", 2777 attribute_byte_length, 2778 CHECK); 2779 2780 cfs->guarantee_more(attribute_byte_length, CHECK); 2781 2782 int attribute_array_length = cfs->get_u2_fast(); 2783 2784 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2785 "Short length on BootstrapMethods in class file %s", 2786 CHECK); 2787 2788 2789 // The attribute contains a counted array of counted tuples of shorts, 2790 // represending bootstrap specifiers: 2791 // length*{bootstrap_method_index, argument_count*{argument_index}} 2792 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2793 // operand_count = number of shorts in attr, except for leading length 2794 2795 // The attribute is copied into a short[] array. 2796 // The array begins with a series of short[2] pairs, one for each tuple. 2797 int index_size = (attribute_array_length * 2); 2798 2799 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2800 2801 // Eagerly assign operands so they will be deallocated with the constant 2802 // pool if there is an error. 2803 _cp->set_operands(operands); 2804 2805 int operand_fill_index = index_size; 2806 int cp_size = _cp->length(); 2807 2808 for (int n = 0; n < attribute_array_length; n++) { 2809 // Store a 32-bit offset into the header of the operand array. 2810 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2811 2812 // Read a bootstrap specifier. 2813 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2814 u2 bootstrap_method_index = cfs->get_u2_fast(); 2815 u2 argument_count = cfs->get_u2_fast(); 2816 check_property( 2817 valid_cp_range(bootstrap_method_index, cp_size) && 2818 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2819 "bootstrap_method_index %u has bad constant type in class file %s", 2820 bootstrap_method_index, 2821 CHECK); 2822 2823 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 2824 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 2825 CHECK); 2826 2827 operands->at_put(operand_fill_index++, bootstrap_method_index); 2828 operands->at_put(operand_fill_index++, argument_count); 2829 2830 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2831 for (int j = 0; j < argument_count; j++) { 2832 u2 argument_index = cfs->get_u2_fast(); 2833 check_property( 2834 valid_cp_range(argument_index, cp_size) && 2835 _cp->tag_at(argument_index).is_loadable_constant(), 2836 "argument_index %u has bad constant type in class file %s", 2837 argument_index, 2838 CHECK); 2839 operands->at_put(operand_fill_index++, argument_index); 2840 } 2841 } 2842 2843 u1* current_end = cfs->current(); 2844 guarantee_property(current_end == current_start + attribute_byte_length, 2845 "Bad length on BootstrapMethods in class file %s", 2846 CHECK); 2847 } 2848 2849 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2850 TRAPS) { 2851 ClassFileStream* cfs = stream(); 2852 // Set inner classes attribute to default sentinel 2853 _inner_classes = Universe::the_empty_short_array(); 2854 cfs->guarantee_more(2, CHECK); // attributes_count 2855 u2 attributes_count = cfs->get_u2_fast(); 2856 bool parsed_sourcefile_attribute = false; 2857 bool parsed_innerclasses_attribute = false; 2858 bool parsed_enclosingmethod_attribute = false; 2859 bool parsed_bootstrap_methods_attribute = false; 2860 u1* runtime_visible_annotations = NULL; 2861 int runtime_visible_annotations_length = 0; 2862 u1* runtime_invisible_annotations = NULL; 2863 int runtime_invisible_annotations_length = 0; 2864 u1* runtime_visible_type_annotations = NULL; 2865 int runtime_visible_type_annotations_length = 0; 2866 u1* runtime_invisible_type_annotations = NULL; 2867 int runtime_invisible_type_annotations_length = 0; 2868 bool runtime_invisible_type_annotations_exists = false; 2869 bool runtime_invisible_annotations_exists = false; 2870 bool parsed_source_debug_ext_annotations_exist = false; 2871 u1* inner_classes_attribute_start = NULL; 2872 u4 inner_classes_attribute_length = 0; 2873 u2 enclosing_method_class_index = 0; 2874 u2 enclosing_method_method_index = 0; 2875 // Iterate over attributes 2876 while (attributes_count--) { 2877 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2878 u2 attribute_name_index = cfs->get_u2_fast(); 2879 u4 attribute_length = cfs->get_u4_fast(); 2880 check_property( 2881 valid_symbol_at(attribute_name_index), 2882 "Attribute name has bad constant pool index %u in class file %s", 2883 attribute_name_index, CHECK); 2884 Symbol* tag = _cp->symbol_at(attribute_name_index); 2885 if (tag == vmSymbols::tag_source_file()) { 2886 // Check for SourceFile tag 2887 if (_need_verify) { 2888 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2889 } 2890 if (parsed_sourcefile_attribute) { 2891 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2892 } else { 2893 parsed_sourcefile_attribute = true; 2894 } 2895 parse_classfile_sourcefile_attribute(CHECK); 2896 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2897 // Check for SourceDebugExtension tag 2898 if (parsed_source_debug_ext_annotations_exist) { 2899 classfile_parse_error( 2900 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 2901 } 2902 parsed_source_debug_ext_annotations_exist = true; 2903 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2904 } else if (tag == vmSymbols::tag_inner_classes()) { 2905 // Check for InnerClasses tag 2906 if (parsed_innerclasses_attribute) { 2907 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2908 } else { 2909 parsed_innerclasses_attribute = true; 2910 } 2911 inner_classes_attribute_start = cfs->get_u1_buffer(); 2912 inner_classes_attribute_length = attribute_length; 2913 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2914 } else if (tag == vmSymbols::tag_synthetic()) { 2915 // Check for Synthetic tag 2916 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2917 if (attribute_length != 0) { 2918 classfile_parse_error( 2919 "Invalid Synthetic classfile attribute length %u in class file %s", 2920 attribute_length, CHECK); 2921 } 2922 parse_classfile_synthetic_attribute(CHECK); 2923 } else if (tag == vmSymbols::tag_deprecated()) { 2924 // Check for Deprecatd tag - 4276120 2925 if (attribute_length != 0) { 2926 classfile_parse_error( 2927 "Invalid Deprecated classfile attribute length %u in class file %s", 2928 attribute_length, CHECK); 2929 } 2930 } else if (_major_version >= JAVA_1_5_VERSION) { 2931 if (tag == vmSymbols::tag_signature()) { 2932 if (attribute_length != 2) { 2933 classfile_parse_error( 2934 "Wrong Signature attribute length %u in class file %s", 2935 attribute_length, CHECK); 2936 } 2937 parse_classfile_signature_attribute(CHECK); 2938 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2939 if (runtime_visible_annotations != NULL) { 2940 classfile_parse_error( 2941 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 2942 } 2943 runtime_visible_annotations_length = attribute_length; 2944 runtime_visible_annotations = cfs->get_u1_buffer(); 2945 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2946 parse_annotations(runtime_visible_annotations, 2947 runtime_visible_annotations_length, 2948 parsed_annotations, 2949 CHECK); 2950 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2951 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 2952 if (runtime_invisible_annotations_exists) { 2953 classfile_parse_error( 2954 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 2955 } 2956 runtime_invisible_annotations_exists = true; 2957 if (PreserveAllAnnotations) { 2958 runtime_invisible_annotations_length = attribute_length; 2959 runtime_invisible_annotations = cfs->get_u1_buffer(); 2960 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2961 } 2962 cfs->skip_u1(attribute_length, CHECK); 2963 } else if (tag == vmSymbols::tag_enclosing_method()) { 2964 if (parsed_enclosingmethod_attribute) { 2965 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2966 } else { 2967 parsed_enclosingmethod_attribute = true; 2968 } 2969 guarantee_property(attribute_length == 4, 2970 "Wrong EnclosingMethod attribute length %u in class file %s", 2971 attribute_length, CHECK); 2972 cfs->guarantee_more(4, CHECK); // class_index, method_index 2973 enclosing_method_class_index = cfs->get_u2_fast(); 2974 enclosing_method_method_index = cfs->get_u2_fast(); 2975 if (enclosing_method_class_index == 0) { 2976 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2977 } 2978 // Validate the constant pool indices and types 2979 check_property(valid_klass_reference_at(enclosing_method_class_index), 2980 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2981 if (enclosing_method_method_index != 0 && 2982 (!_cp->is_within_bounds(enclosing_method_method_index) || 2983 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 2984 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2985 } 2986 } else if (tag == vmSymbols::tag_bootstrap_methods() && 2987 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 2988 if (parsed_bootstrap_methods_attribute) 2989 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 2990 parsed_bootstrap_methods_attribute = true; 2991 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 2992 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 2993 if (runtime_visible_type_annotations != NULL) { 2994 classfile_parse_error( 2995 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 2996 } 2997 runtime_visible_type_annotations_length = attribute_length; 2998 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2999 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3000 // No need for the VM to parse Type annotations 3001 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3002 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3003 if (runtime_invisible_type_annotations_exists) { 3004 classfile_parse_error( 3005 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3006 } else { 3007 runtime_invisible_type_annotations_exists = true; 3008 } 3009 if (PreserveAllAnnotations) { 3010 runtime_invisible_type_annotations_length = attribute_length; 3011 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3012 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3013 } 3014 cfs->skip_u1(attribute_length, CHECK); 3015 } else { 3016 // Unknown attribute 3017 cfs->skip_u1(attribute_length, CHECK); 3018 } 3019 } else { 3020 // Unknown attribute 3021 cfs->skip_u1(attribute_length, CHECK); 3022 } 3023 } 3024 _annotations = assemble_annotations(runtime_visible_annotations, 3025 runtime_visible_annotations_length, 3026 runtime_invisible_annotations, 3027 runtime_invisible_annotations_length, 3028 CHECK); 3029 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3030 runtime_visible_type_annotations_length, 3031 runtime_invisible_type_annotations, 3032 runtime_invisible_type_annotations_length, 3033 CHECK); 3034 3035 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3036 u2 num_of_classes = parse_classfile_inner_classes_attribute( 3037 inner_classes_attribute_start, 3038 parsed_innerclasses_attribute, 3039 enclosing_method_class_index, 3040 enclosing_method_method_index, 3041 CHECK); 3042 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3043 guarantee_property( 3044 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3045 "Wrong InnerClasses attribute length in class file %s", CHECK); 3046 } 3047 } 3048 3049 if (_max_bootstrap_specifier_index >= 0) { 3050 guarantee_property(parsed_bootstrap_methods_attribute, 3051 "Missing BootstrapMethods attribute in class file %s", CHECK); 3052 } 3053 } 3054 3055 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 3056 if (_synthetic_flag) 3057 k->set_is_synthetic(); 3058 if (_sourcefile_index != 0) { 3059 k->set_source_file_name_index(_sourcefile_index); 3060 } 3061 if (_generic_signature_index != 0) { 3062 k->set_generic_signature_index(_generic_signature_index); 3063 } 3064 if (_sde_buffer != NULL) { 3065 k->set_source_debug_extension(_sde_buffer, _sde_length); 3066 } 3067 } 3068 3069 // Create the Annotations object that will 3070 // hold the annotations array for the Klass. 3071 void ClassFileParser::create_combined_annotations(TRAPS) { 3072 if (_annotations == NULL && 3073 _type_annotations == NULL && 3074 _fields_annotations == NULL && 3075 _fields_type_annotations == NULL) { 3076 // Don't create the Annotations object unnecessarily. 3077 return; 3078 } 3079 3080 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3081 annotations->set_class_annotations(_annotations); 3082 annotations->set_class_type_annotations(_type_annotations); 3083 annotations->set_fields_annotations(_fields_annotations); 3084 annotations->set_fields_type_annotations(_fields_type_annotations); 3085 3086 // This is the Annotations object that will be 3087 // assigned to InstanceKlass being constructed. 3088 _combined_annotations = annotations; 3089 3090 // The annotations arrays below has been transfered the 3091 // _combined_annotations so these fields can now be cleared. 3092 _annotations = NULL; 3093 _type_annotations = NULL; 3094 _fields_annotations = NULL; 3095 _fields_type_annotations = NULL; 3096 } 3097 3098 // Transfer ownership of metadata allocated to the InstanceKlass. 3099 void ClassFileParser::apply_parsed_class_metadata( 3100 instanceKlassHandle this_klass, 3101 int java_fields_count, TRAPS) { 3102 _cp->set_pool_holder(this_klass()); 3103 this_klass->set_constants(_cp); 3104 this_klass->set_fields(_fields, java_fields_count); 3105 this_klass->set_methods(_methods); 3106 this_klass->set_inner_classes(_inner_classes); 3107 this_klass->set_local_interfaces(_local_interfaces); 3108 this_klass->set_transitive_interfaces(_transitive_interfaces); 3109 this_klass->set_annotations(_combined_annotations); 3110 3111 // Clear out these fields so they don't get deallocated by the destructor 3112 clear_class_metadata(); 3113 } 3114 3115 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3116 int runtime_visible_annotations_length, 3117 u1* runtime_invisible_annotations, 3118 int runtime_invisible_annotations_length, TRAPS) { 3119 AnnotationArray* annotations = NULL; 3120 if (runtime_visible_annotations != NULL || 3121 runtime_invisible_annotations != NULL) { 3122 annotations = MetadataFactory::new_array<u1>(_loader_data, 3123 runtime_visible_annotations_length + 3124 runtime_invisible_annotations_length, 3125 CHECK_(annotations)); 3126 if (runtime_visible_annotations != NULL) { 3127 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3128 annotations->at_put(i, runtime_visible_annotations[i]); 3129 } 3130 } 3131 if (runtime_invisible_annotations != NULL) { 3132 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3133 int append = runtime_visible_annotations_length+i; 3134 annotations->at_put(append, runtime_invisible_annotations[i]); 3135 } 3136 } 3137 } 3138 return annotations; 3139 } 3140 3141 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3142 TRAPS) { 3143 instanceKlassHandle super_klass; 3144 if (super_class_index == 0) { 3145 check_property(_class_name == vmSymbols::java_lang_Object(), 3146 "Invalid superclass index %u in class file %s", 3147 super_class_index, 3148 CHECK_NULL); 3149 } else { 3150 check_property(valid_klass_reference_at(super_class_index), 3151 "Invalid superclass index %u in class file %s", 3152 super_class_index, 3153 CHECK_NULL); 3154 // The class name should be legal because it is checked when parsing constant pool. 3155 // However, make sure it is not an array type. 3156 bool is_array = false; 3157 if (_cp->tag_at(super_class_index).is_klass()) { 3158 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3159 if (_need_verify) 3160 is_array = super_klass->oop_is_array(); 3161 } else if (_need_verify) { 3162 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3163 } 3164 if (_need_verify) { 3165 guarantee_property(!is_array, 3166 "Bad superclass name in class file %s", CHECK_NULL); 3167 } 3168 } 3169 return super_klass; 3170 } 3171 3172 3173 // Values needed for oopmap and InstanceKlass creation 3174 class FieldLayoutInfo : public StackObj { 3175 public: 3176 int* nonstatic_oop_offsets; 3177 unsigned int* nonstatic_oop_counts; 3178 unsigned int nonstatic_oop_map_count; 3179 unsigned int total_oop_map_count; 3180 int instance_size; 3181 int nonstatic_field_size; 3182 int static_field_size; 3183 bool has_nonstatic_fields; 3184 }; 3185 3186 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3187 void ClassFileParser::layout_fields(Handle class_loader, 3188 FieldAllocationCount* fac, 3189 ClassAnnotationCollector* parsed_annotations, 3190 FieldLayoutInfo* info, 3191 TRAPS) { 3192 3193 // Field size and offset computation 3194 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3195 int next_static_oop_offset; 3196 int next_static_double_offset; 3197 int next_static_word_offset; 3198 int next_static_short_offset; 3199 int next_static_byte_offset; 3200 int next_nonstatic_oop_offset; 3201 int next_nonstatic_double_offset; 3202 int next_nonstatic_word_offset; 3203 int next_nonstatic_short_offset; 3204 int next_nonstatic_byte_offset; 3205 int first_nonstatic_oop_offset; 3206 int next_nonstatic_field_offset; 3207 int next_nonstatic_padded_offset; 3208 3209 // Count the contended fields by type. 3210 // 3211 // We ignore static fields, because @Contended is not supported for them. 3212 // The layout code below will also ignore the static fields. 3213 int nonstatic_contended_count = 0; 3214 FieldAllocationCount fac_contended; 3215 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3216 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3217 if (fs.is_contended()) { 3218 fac_contended.count[atype]++; 3219 if (!fs.access_flags().is_static()) { 3220 nonstatic_contended_count++; 3221 } 3222 } 3223 } 3224 3225 3226 // Calculate the starting byte offsets 3227 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3228 next_static_double_offset = next_static_oop_offset + 3229 ((fac->count[STATIC_OOP]) * heapOopSize); 3230 if ( fac->count[STATIC_DOUBLE] && 3231 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3232 Universe::field_type_should_be_aligned(T_LONG)) ) { 3233 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3234 } 3235 3236 next_static_word_offset = next_static_double_offset + 3237 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3238 next_static_short_offset = next_static_word_offset + 3239 ((fac->count[STATIC_WORD]) * BytesPerInt); 3240 next_static_byte_offset = next_static_short_offset + 3241 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3242 3243 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3244 nonstatic_field_size * heapOopSize; 3245 3246 next_nonstatic_field_offset = nonstatic_fields_start; 3247 3248 bool is_contended_class = parsed_annotations->is_contended(); 3249 3250 // Class is contended, pad before all the fields 3251 if (is_contended_class) { 3252 next_nonstatic_field_offset += ContendedPaddingWidth; 3253 } 3254 3255 // Compute the non-contended fields count. 3256 // The packing code below relies on these counts to determine if some field 3257 // can be squeezed into the alignment gap. Contended fields are obviously 3258 // exempt from that. 3259 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3260 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3261 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3262 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3263 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3264 3265 // Total non-static fields count, including every contended field 3266 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3267 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3268 fac->count[NONSTATIC_OOP]; 3269 3270 bool super_has_nonstatic_fields = 3271 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3272 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3273 3274 3275 // Prepare list of oops for oop map generation. 3276 // 3277 // "offset" and "count" lists are describing the set of contiguous oop 3278 // regions. offset[i] is the start of the i-th region, which then has 3279 // count[i] oops following. Before we know how many regions are required, 3280 // we pessimistically allocate the maps to fit all the oops into the 3281 // distinct regions. 3282 // 3283 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3284 // to figure out if we still need to do this. 3285 int* nonstatic_oop_offsets; 3286 unsigned int* nonstatic_oop_counts; 3287 unsigned int nonstatic_oop_map_count = 0; 3288 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3289 3290 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3291 THREAD, int, max_nonstatic_oop_maps); 3292 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3293 THREAD, unsigned int, max_nonstatic_oop_maps); 3294 3295 first_nonstatic_oop_offset = 0; // will be set for first oop field 3296 3297 bool compact_fields = CompactFields; 3298 int allocation_style = FieldsAllocationStyle; 3299 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3300 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3301 allocation_style = 1; // Optimistic 3302 } 3303 3304 // The next classes have predefined hard-coded fields offsets 3305 // (see in JavaClasses::compute_hard_coded_offsets()). 3306 // Use default fields allocation order for them. 3307 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3308 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3309 _class_name == vmSymbols::java_lang_Class() || 3310 _class_name == vmSymbols::java_lang_ClassLoader() || 3311 _class_name == vmSymbols::java_lang_ref_Reference() || 3312 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3313 _class_name == vmSymbols::java_lang_StackTraceElement() || 3314 _class_name == vmSymbols::java_lang_String() || 3315 _class_name == vmSymbols::java_lang_Throwable() || 3316 _class_name == vmSymbols::java_lang_Boolean() || 3317 _class_name == vmSymbols::java_lang_Character() || 3318 _class_name == vmSymbols::java_lang_Float() || 3319 _class_name == vmSymbols::java_lang_Double() || 3320 _class_name == vmSymbols::java_lang_Byte() || 3321 _class_name == vmSymbols::java_lang_Short() || 3322 _class_name == vmSymbols::java_lang_Integer() || 3323 _class_name == vmSymbols::java_lang_Long())) { 3324 allocation_style = 0; // Allocate oops first 3325 compact_fields = false; // Don't compact fields 3326 } 3327 3328 // Rearrange fields for a given allocation style 3329 if( allocation_style == 0 ) { 3330 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3331 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3332 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3333 (nonstatic_oop_count * heapOopSize); 3334 } else if( allocation_style == 1 ) { 3335 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3336 next_nonstatic_double_offset = next_nonstatic_field_offset; 3337 } else if( allocation_style == 2 ) { 3338 // Fields allocation: oops fields in super and sub classes are together. 3339 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3340 _super_klass->nonstatic_oop_map_size() > 0 ) { 3341 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3342 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3343 OopMapBlock* last_map = first_map + map_count - 1; 3344 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3345 if (next_offset == next_nonstatic_field_offset) { 3346 allocation_style = 0; // allocate oops first 3347 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3348 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3349 (nonstatic_oop_count * heapOopSize); 3350 } 3351 } 3352 if( allocation_style == 2 ) { 3353 allocation_style = 1; // allocate oops last 3354 next_nonstatic_double_offset = next_nonstatic_field_offset; 3355 } 3356 } else { 3357 ShouldNotReachHere(); 3358 } 3359 3360 int nonstatic_oop_space_count = 0; 3361 int nonstatic_word_space_count = 0; 3362 int nonstatic_short_space_count = 0; 3363 int nonstatic_byte_space_count = 0; 3364 int nonstatic_oop_space_offset; 3365 int nonstatic_word_space_offset; 3366 int nonstatic_short_space_offset; 3367 int nonstatic_byte_space_offset; 3368 3369 // Try to squeeze some of the fields into the gaps due to 3370 // long/double alignment. 3371 if( nonstatic_double_count > 0 ) { 3372 int offset = next_nonstatic_double_offset; 3373 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3374 if( compact_fields && offset != next_nonstatic_double_offset ) { 3375 // Allocate available fields into the gap before double field. 3376 int length = next_nonstatic_double_offset - offset; 3377 assert(length == BytesPerInt, ""); 3378 nonstatic_word_space_offset = offset; 3379 if( nonstatic_word_count > 0 ) { 3380 nonstatic_word_count -= 1; 3381 nonstatic_word_space_count = 1; // Only one will fit 3382 length -= BytesPerInt; 3383 offset += BytesPerInt; 3384 } 3385 nonstatic_short_space_offset = offset; 3386 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3387 nonstatic_short_count -= 1; 3388 nonstatic_short_space_count += 1; 3389 length -= BytesPerShort; 3390 offset += BytesPerShort; 3391 } 3392 nonstatic_byte_space_offset = offset; 3393 while( length > 0 && nonstatic_byte_count > 0 ) { 3394 nonstatic_byte_count -= 1; 3395 nonstatic_byte_space_count += 1; 3396 length -= 1; 3397 } 3398 // Allocate oop field in the gap if there are no other fields for that. 3399 nonstatic_oop_space_offset = offset; 3400 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3401 allocation_style != 0 ) { // when oop fields not first 3402 nonstatic_oop_count -= 1; 3403 nonstatic_oop_space_count = 1; // Only one will fit 3404 length -= heapOopSize; 3405 offset += heapOopSize; 3406 } 3407 } 3408 } 3409 3410 next_nonstatic_word_offset = next_nonstatic_double_offset + 3411 (nonstatic_double_count * BytesPerLong); 3412 next_nonstatic_short_offset = next_nonstatic_word_offset + 3413 (nonstatic_word_count * BytesPerInt); 3414 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3415 (nonstatic_short_count * BytesPerShort); 3416 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3417 nonstatic_byte_count; 3418 3419 // let oops jump before padding with this allocation style 3420 if( allocation_style == 1 ) { 3421 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3422 if( nonstatic_oop_count > 0 ) { 3423 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3424 } 3425 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3426 } 3427 3428 // Iterate over fields again and compute correct offsets. 3429 // The field allocation type was temporarily stored in the offset slot. 3430 // oop fields are located before non-oop fields (static and non-static). 3431 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3432 3433 // skip already laid out fields 3434 if (fs.is_offset_set()) continue; 3435 3436 // contended instance fields are handled below 3437 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3438 3439 int real_offset; 3440 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3441 3442 // pack the rest of the fields 3443 switch (atype) { 3444 case STATIC_OOP: 3445 real_offset = next_static_oop_offset; 3446 next_static_oop_offset += heapOopSize; 3447 break; 3448 case STATIC_BYTE: 3449 real_offset = next_static_byte_offset; 3450 next_static_byte_offset += 1; 3451 break; 3452 case STATIC_SHORT: 3453 real_offset = next_static_short_offset; 3454 next_static_short_offset += BytesPerShort; 3455 break; 3456 case STATIC_WORD: 3457 real_offset = next_static_word_offset; 3458 next_static_word_offset += BytesPerInt; 3459 break; 3460 case STATIC_DOUBLE: 3461 real_offset = next_static_double_offset; 3462 next_static_double_offset += BytesPerLong; 3463 break; 3464 case NONSTATIC_OOP: 3465 if( nonstatic_oop_space_count > 0 ) { 3466 real_offset = nonstatic_oop_space_offset; 3467 nonstatic_oop_space_offset += heapOopSize; 3468 nonstatic_oop_space_count -= 1; 3469 } else { 3470 real_offset = next_nonstatic_oop_offset; 3471 next_nonstatic_oop_offset += heapOopSize; 3472 } 3473 3474 // Record this oop in the oop maps 3475 if( nonstatic_oop_map_count > 0 && 3476 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3477 real_offset - 3478 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3479 heapOopSize ) { 3480 // This oop is adjacent to the previous one, add to current oop map 3481 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3482 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3483 } else { 3484 // This oop is not adjacent to the previous one, create new oop map 3485 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3486 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3487 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3488 nonstatic_oop_map_count += 1; 3489 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3490 first_nonstatic_oop_offset = real_offset; 3491 } 3492 } 3493 break; 3494 case NONSTATIC_BYTE: 3495 if( nonstatic_byte_space_count > 0 ) { 3496 real_offset = nonstatic_byte_space_offset; 3497 nonstatic_byte_space_offset += 1; 3498 nonstatic_byte_space_count -= 1; 3499 } else { 3500 real_offset = next_nonstatic_byte_offset; 3501 next_nonstatic_byte_offset += 1; 3502 } 3503 break; 3504 case NONSTATIC_SHORT: 3505 if( nonstatic_short_space_count > 0 ) { 3506 real_offset = nonstatic_short_space_offset; 3507 nonstatic_short_space_offset += BytesPerShort; 3508 nonstatic_short_space_count -= 1; 3509 } else { 3510 real_offset = next_nonstatic_short_offset; 3511 next_nonstatic_short_offset += BytesPerShort; 3512 } 3513 break; 3514 case NONSTATIC_WORD: 3515 if( nonstatic_word_space_count > 0 ) { 3516 real_offset = nonstatic_word_space_offset; 3517 nonstatic_word_space_offset += BytesPerInt; 3518 nonstatic_word_space_count -= 1; 3519 } else { 3520 real_offset = next_nonstatic_word_offset; 3521 next_nonstatic_word_offset += BytesPerInt; 3522 } 3523 break; 3524 case NONSTATIC_DOUBLE: 3525 real_offset = next_nonstatic_double_offset; 3526 next_nonstatic_double_offset += BytesPerLong; 3527 break; 3528 default: 3529 ShouldNotReachHere(); 3530 } 3531 fs.set_offset(real_offset); 3532 } 3533 3534 3535 // Handle the contended cases. 3536 // 3537 // Each contended field should not intersect the cache line with another contended field. 3538 // In the absence of alignment information, we end up with pessimistically separating 3539 // the fields with full-width padding. 3540 // 3541 // Additionally, this should not break alignment for the fields, so we round the alignment up 3542 // for each field. 3543 if (nonstatic_contended_count > 0) { 3544 3545 // if there is at least one contended field, we need to have pre-padding for them 3546 next_nonstatic_padded_offset += ContendedPaddingWidth; 3547 3548 // collect all contended groups 3549 BitMap bm(_cp->size()); 3550 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3551 // skip already laid out fields 3552 if (fs.is_offset_set()) continue; 3553 3554 if (fs.is_contended()) { 3555 bm.set_bit(fs.contended_group()); 3556 } 3557 } 3558 3559 int current_group = -1; 3560 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3561 3562 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3563 3564 // skip already laid out fields 3565 if (fs.is_offset_set()) continue; 3566 3567 // skip non-contended fields and fields from different group 3568 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3569 3570 // handle statics below 3571 if (fs.access_flags().is_static()) continue; 3572 3573 int real_offset; 3574 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3575 3576 switch (atype) { 3577 case NONSTATIC_BYTE: 3578 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3579 real_offset = next_nonstatic_padded_offset; 3580 next_nonstatic_padded_offset += 1; 3581 break; 3582 3583 case NONSTATIC_SHORT: 3584 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3585 real_offset = next_nonstatic_padded_offset; 3586 next_nonstatic_padded_offset += BytesPerShort; 3587 break; 3588 3589 case NONSTATIC_WORD: 3590 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3591 real_offset = next_nonstatic_padded_offset; 3592 next_nonstatic_padded_offset += BytesPerInt; 3593 break; 3594 3595 case NONSTATIC_DOUBLE: 3596 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3597 real_offset = next_nonstatic_padded_offset; 3598 next_nonstatic_padded_offset += BytesPerLong; 3599 break; 3600 3601 case NONSTATIC_OOP: 3602 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3603 real_offset = next_nonstatic_padded_offset; 3604 next_nonstatic_padded_offset += heapOopSize; 3605 3606 // Record this oop in the oop maps 3607 if( nonstatic_oop_map_count > 0 && 3608 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3609 real_offset - 3610 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3611 heapOopSize ) { 3612 // This oop is adjacent to the previous one, add to current oop map 3613 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3614 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3615 } else { 3616 // This oop is not adjacent to the previous one, create new oop map 3617 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3618 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3619 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3620 nonstatic_oop_map_count += 1; 3621 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3622 first_nonstatic_oop_offset = real_offset; 3623 } 3624 } 3625 break; 3626 3627 default: 3628 ShouldNotReachHere(); 3629 } 3630 3631 if (fs.contended_group() == 0) { 3632 // Contended group defines the equivalence class over the fields: 3633 // the fields within the same contended group are not inter-padded. 3634 // The only exception is default group, which does not incur the 3635 // equivalence, and so requires intra-padding. 3636 next_nonstatic_padded_offset += ContendedPaddingWidth; 3637 } 3638 3639 fs.set_offset(real_offset); 3640 } // for 3641 3642 // Start laying out the next group. 3643 // Note that this will effectively pad the last group in the back; 3644 // this is expected to alleviate memory contention effects for 3645 // subclass fields and/or adjacent object. 3646 // If this was the default group, the padding is already in place. 3647 if (current_group != 0) { 3648 next_nonstatic_padded_offset += ContendedPaddingWidth; 3649 } 3650 } 3651 3652 // handle static fields 3653 } 3654 3655 // Entire class is contended, pad in the back. 3656 // This helps to alleviate memory contention effects for subclass fields 3657 // and/or adjacent object. 3658 if (is_contended_class) { 3659 next_nonstatic_padded_offset += ContendedPaddingWidth; 3660 } 3661 3662 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3663 3664 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3665 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3666 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3667 3668 int static_field_size = (static_fields_end - 3669 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3670 nonstatic_field_size = nonstatic_field_size + 3671 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3672 3673 int instance_size = align_object_size(instance_end / wordSize); 3674 3675 assert(instance_size == align_object_size(align_size_up( 3676 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3677 wordSize) / wordSize), "consistent layout helper value"); 3678 3679 // Invariant: nonstatic_field end/start should only change if there are 3680 // nonstatic fields in the class, or if the class is contended. We compare 3681 // against the non-aligned value, so that end alignment will not fail the 3682 // assert without actually having the fields. 3683 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3684 is_contended_class || 3685 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3686 3687 // Number of non-static oop map blocks allocated at end of klass. 3688 const unsigned int total_oop_map_count = 3689 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3690 first_nonstatic_oop_offset); 3691 3692 #ifndef PRODUCT 3693 if (PrintFieldLayout) { 3694 print_field_layout(_class_name, 3695 _fields, 3696 _cp, 3697 instance_size, 3698 nonstatic_fields_start, 3699 nonstatic_fields_end, 3700 static_fields_end); 3701 } 3702 3703 #endif 3704 // Pass back information needed for InstanceKlass creation 3705 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3706 info->nonstatic_oop_counts = nonstatic_oop_counts; 3707 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3708 info->total_oop_map_count = total_oop_map_count; 3709 info->instance_size = instance_size; 3710 info->static_field_size = static_field_size; 3711 info->nonstatic_field_size = nonstatic_field_size; 3712 info->has_nonstatic_fields = has_nonstatic_fields; 3713 } 3714 3715 3716 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3717 ClassLoaderData* loader_data, 3718 Handle protection_domain, 3719 KlassHandle host_klass, 3720 GrowableArray<Handle>* cp_patches, 3721 TempNewSymbol& parsed_name, 3722 bool verify, 3723 TRAPS) { 3724 3725 // When a retransformable agent is attached, JVMTI caches the 3726 // class bytes that existed before the first retransformation. 3727 // If RedefineClasses() was used before the retransformable 3728 // agent attached, then the cached class bytes may not be the 3729 // original class bytes. 3730 JvmtiCachedClassFileData *cached_class_file = NULL; 3731 Handle class_loader(THREAD, loader_data->class_loader()); 3732 bool has_default_methods = false; 3733 bool declares_default_methods = false; 3734 ResourceMark rm(THREAD); 3735 3736 ClassFileStream* cfs = stream(); 3737 // Timing 3738 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3739 JavaThread* jt = (JavaThread*) THREAD; 3740 3741 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3742 ClassLoader::perf_class_parse_selftime(), 3743 NULL, 3744 jt->get_thread_stat()->perf_recursion_counts_addr(), 3745 jt->get_thread_stat()->perf_timers_addr(), 3746 PerfClassTraceTime::PARSE_CLASS); 3747 3748 init_parsed_class_attributes(loader_data); 3749 3750 if (JvmtiExport::should_post_class_file_load_hook()) { 3751 // Get the cached class file bytes (if any) from the class that 3752 // is being redefined or retransformed. We use jvmti_thread_state() 3753 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3754 // a JvmtiThreadState any earlier than necessary. This will help 3755 // avoid the bug described by 7126851. 3756 JvmtiThreadState *state = jt->jvmti_thread_state(); 3757 if (state != NULL) { 3758 KlassHandle *h_class_being_redefined = 3759 state->get_class_being_redefined(); 3760 if (h_class_being_redefined != NULL) { 3761 instanceKlassHandle ikh_class_being_redefined = 3762 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3763 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3764 } 3765 } 3766 3767 unsigned char* ptr = cfs->buffer(); 3768 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3769 3770 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3771 &ptr, &end_ptr, &cached_class_file); 3772 3773 if (ptr != cfs->buffer()) { 3774 // JVMTI agent has modified class file data. 3775 // Set new class file stream using JVMTI agent modified 3776 // class file data. 3777 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3778 set_stream(cfs); 3779 } 3780 } 3781 3782 _host_klass = host_klass; 3783 _cp_patches = cp_patches; 3784 3785 instanceKlassHandle nullHandle; 3786 3787 // Figure out whether we can skip format checking (matching classic VM behavior) 3788 if (DumpSharedSpaces) { 3789 // verify == true means it's a 'remote' class (i.e., non-boot class) 3790 // Verification decision is based on BytecodeVerificationRemote flag 3791 // for those classes. 3792 _need_verify = (verify) ? BytecodeVerificationRemote : 3793 BytecodeVerificationLocal; 3794 } else { 3795 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3796 } 3797 3798 // Set the verify flag in stream 3799 cfs->set_verify(_need_verify); 3800 3801 // Save the class file name for easier error message printing. 3802 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3803 3804 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3805 // Magic value 3806 u4 magic = cfs->get_u4_fast(); 3807 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3808 "Incompatible magic value %u in class file %s", 3809 magic, CHECK_(nullHandle)); 3810 3811 // Version numbers 3812 u2 minor_version = cfs->get_u2_fast(); 3813 u2 major_version = cfs->get_u2_fast(); 3814 3815 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { 3816 ResourceMark rm; 3817 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 3818 major_version, minor_version, name->as_C_string()); 3819 Exceptions::fthrow( 3820 THREAD_AND_LOCATION, 3821 vmSymbols::java_lang_UnsupportedClassVersionError(), 3822 "Unsupported major.minor version for dump time %u.%u", 3823 major_version, 3824 minor_version); 3825 } 3826 3827 // Check version numbers - we check this even with verifier off 3828 if (!is_supported_version(major_version, minor_version)) { 3829 if (name == NULL) { 3830 Exceptions::fthrow( 3831 THREAD_AND_LOCATION, 3832 vmSymbols::java_lang_UnsupportedClassVersionError(), 3833 "Unsupported class file version %u.%u, " 3834 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3835 major_version, 3836 minor_version, 3837 JAVA_MAX_SUPPORTED_VERSION, 3838 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3839 } else { 3840 ResourceMark rm(THREAD); 3841 Exceptions::fthrow( 3842 THREAD_AND_LOCATION, 3843 vmSymbols::java_lang_UnsupportedClassVersionError(), 3844 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 3845 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3846 name->as_C_string(), 3847 major_version, 3848 minor_version, 3849 JAVA_MAX_SUPPORTED_VERSION, 3850 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3851 } 3852 return nullHandle; 3853 } 3854 3855 _major_version = major_version; 3856 _minor_version = minor_version; 3857 3858 3859 // Check if verification needs to be relaxed for this class file 3860 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3861 _relax_verify = Verifier::relax_verify_for(class_loader()); 3862 3863 // Constant pool 3864 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3865 3866 int cp_size = cp->length(); 3867 3868 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3869 3870 // Access flags 3871 AccessFlags access_flags; 3872 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3873 3874 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3875 // Set abstract bit for old class files for backward compatibility 3876 flags |= JVM_ACC_ABSTRACT; 3877 } 3878 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3879 access_flags.set_flags(flags); 3880 3881 // This class and superclass 3882 u2 this_class_index = cfs->get_u2_fast(); 3883 check_property( 3884 valid_cp_range(this_class_index, cp_size) && 3885 cp->tag_at(this_class_index).is_unresolved_klass(), 3886 "Invalid this class index %u in constant pool in class file %s", 3887 this_class_index, CHECK_(nullHandle)); 3888 3889 Symbol* class_name = cp->klass_name_at(this_class_index); 3890 assert(class_name != NULL, "class_name can't be null"); 3891 3892 // It's important to set parsed_name *before* resolving the super class. 3893 // (it's used for cleanup by the caller if parsing fails) 3894 parsed_name = class_name; 3895 // parsed_name is returned and can be used if there's an error, so add to 3896 // its reference count. Caller will decrement the refcount. 3897 parsed_name->increment_refcount(); 3898 3899 // Update _class_name which could be null previously to be class_name 3900 _class_name = class_name; 3901 3902 // Don't need to check whether this class name is legal or not. 3903 // It has been checked when constant pool is parsed. 3904 // However, make sure it is not an array type. 3905 if (_need_verify) { 3906 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3907 "Bad class name in class file %s", 3908 CHECK_(nullHandle)); 3909 } 3910 3911 Klass* preserve_this_klass; // for storing result across HandleMark 3912 3913 // release all handles when parsing is done 3914 { HandleMark hm(THREAD); 3915 3916 // Checks if name in class file matches requested name 3917 if (name != NULL && class_name != name) { 3918 ResourceMark rm(THREAD); 3919 Exceptions::fthrow( 3920 THREAD_AND_LOCATION, 3921 vmSymbols::java_lang_NoClassDefFoundError(), 3922 "%s (wrong name: %s)", 3923 name->as_C_string(), 3924 class_name->as_C_string() 3925 ); 3926 return nullHandle; 3927 } 3928 3929 if (TraceClassLoadingPreorder) { 3930 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3931 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3932 tty->print_cr("]"); 3933 } 3934 #if INCLUDE_CDS 3935 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { 3936 // Only dump the classes that can be stored into CDS archive 3937 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { 3938 if (name != NULL) { 3939 ResourceMark rm(THREAD); 3940 classlist_file->print_cr("%s", name->as_C_string()); 3941 classlist_file->flush(); 3942 } 3943 } 3944 } 3945 #endif 3946 3947 u2 super_class_index = cfs->get_u2_fast(); 3948 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3949 CHECK_NULL); 3950 3951 // Interfaces 3952 u2 itfs_len = cfs->get_u2_fast(); 3953 Array<Klass*>* local_interfaces = 3954 parse_interfaces(itfs_len, protection_domain, _class_name, 3955 &has_default_methods, CHECK_(nullHandle)); 3956 3957 u2 java_fields_count = 0; 3958 // Fields (offsets are filled in later) 3959 FieldAllocationCount fac; 3960 Array<u2>* fields = parse_fields(class_name, 3961 access_flags.is_interface(), 3962 &fac, &java_fields_count, 3963 CHECK_(nullHandle)); 3964 // Methods 3965 bool has_final_method = false; 3966 AccessFlags promoted_flags; 3967 promoted_flags.set_flags(0); 3968 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 3969 &promoted_flags, 3970 &has_final_method, 3971 &declares_default_methods, 3972 CHECK_(nullHandle)); 3973 3974 if (declares_default_methods) { 3975 has_default_methods = true; 3976 } 3977 3978 // Additional attributes 3979 ClassAnnotationCollector parsed_annotations; 3980 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 3981 3982 // Finalize the Annotations metadata object, 3983 // now that all annotation arrays have been created. 3984 create_combined_annotations(CHECK_(nullHandle)); 3985 3986 // Make sure this is the end of class file stream 3987 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3988 3989 // We check super class after class file is parsed and format is checked 3990 if (super_class_index > 0 && super_klass.is_null()) { 3991 Symbol* sk = cp->klass_name_at(super_class_index); 3992 if (access_flags.is_interface()) { 3993 // Before attempting to resolve the superclass, check for class format 3994 // errors not checked yet. 3995 guarantee_property(sk == vmSymbols::java_lang_Object(), 3996 "Interfaces must have java.lang.Object as superclass in class file %s", 3997 CHECK_(nullHandle)); 3998 } 3999 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 4000 class_loader, 4001 protection_domain, 4002 true, 4003 CHECK_(nullHandle)); 4004 4005 KlassHandle kh (THREAD, k); 4006 super_klass = instanceKlassHandle(THREAD, kh()); 4007 } 4008 if (super_klass.not_null()) { 4009 4010 if (super_klass->has_default_methods()) { 4011 has_default_methods = true; 4012 } 4013 4014 if (super_klass->is_interface()) { 4015 ResourceMark rm(THREAD); 4016 Exceptions::fthrow( 4017 THREAD_AND_LOCATION, 4018 vmSymbols::java_lang_IncompatibleClassChangeError(), 4019 "class %s has interface %s as super class", 4020 class_name->as_klass_external_name(), 4021 super_klass->external_name() 4022 ); 4023 return nullHandle; 4024 } 4025 // Make sure super class is not final 4026 if (super_klass->is_final()) { 4027 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 4028 } 4029 } 4030 4031 // save super klass for error handling. 4032 _super_klass = super_klass; 4033 4034 // Compute the transitive list of all unique interfaces implemented by this class 4035 _transitive_interfaces = 4036 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 4037 4038 // sort methods 4039 intArray* method_ordering = sort_methods(methods); 4040 4041 // promote flags from parse_methods() to the klass' flags 4042 access_flags.add_promoted_flags(promoted_flags.as_int()); 4043 4044 // Size of Java vtable (in words) 4045 int vtable_size = 0; 4046 int itable_size = 0; 4047 int num_miranda_methods = 0; 4048 4049 GrowableArray<Method*> all_mirandas(20); 4050 4051 klassVtable::compute_vtable_size_and_num_mirandas( 4052 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 4053 access_flags, class_loader, class_name, local_interfaces, 4054 CHECK_(nullHandle)); 4055 4056 // Size of Java itable (in words) 4057 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 4058 4059 FieldLayoutInfo info; 4060 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 4061 4062 int total_oop_map_size2 = 4063 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 4064 4065 // Compute reference type 4066 ReferenceType rt; 4067 if (super_klass() == NULL) { 4068 rt = REF_NONE; 4069 } else { 4070 rt = super_klass->reference_type(); 4071 } 4072 4073 // We can now create the basic Klass* for this klass 4074 _klass = InstanceKlass::allocate_instance_klass(loader_data, 4075 vtable_size, 4076 itable_size, 4077 info.static_field_size, 4078 total_oop_map_size2, 4079 rt, 4080 access_flags, 4081 name, 4082 super_klass(), 4083 !host_klass.is_null(), 4084 CHECK_(nullHandle)); 4085 instanceKlassHandle this_klass (THREAD, _klass); 4086 4087 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 4088 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 4089 "sanity"); 4090 4091 // Fill in information already parsed 4092 this_klass->set_should_verify_class(verify); 4093 jint lh = Klass::instance_layout_helper(info.instance_size, false); 4094 this_klass->set_layout_helper(lh); 4095 assert(this_klass->oop_is_instance(), "layout is correct"); 4096 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 4097 // Not yet: supers are done below to support the new subtype-checking fields 4098 //this_klass->set_super(super_klass()); 4099 this_klass->set_class_loader_data(loader_data); 4100 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 4101 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 4102 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 4103 4104 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 4105 4106 if (has_final_method) { 4107 this_klass->set_has_final_method(); 4108 } 4109 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 4110 // The InstanceKlass::_methods_jmethod_ids cache 4111 // is managed on the assumption that the initial cache 4112 // size is equal to the number of methods in the class. If 4113 // that changes, then InstanceKlass::idnum_can_increment() 4114 // has to be changed accordingly. 4115 this_klass->set_initial_method_idnum(methods->length()); 4116 this_klass->set_name(cp->klass_name_at(this_class_index)); 4117 if (is_anonymous()) // I am well known to myself 4118 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 4119 4120 this_klass->set_minor_version(minor_version); 4121 this_klass->set_major_version(major_version); 4122 this_klass->set_has_default_methods(has_default_methods); 4123 this_klass->set_declares_default_methods(declares_default_methods); 4124 4125 if (!host_klass.is_null()) { 4126 assert (this_klass->is_anonymous(), "should be the same"); 4127 this_klass->set_host_klass(host_klass()); 4128 } 4129 4130 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4131 // (We used to do this lazily, but now we query it in Rewriter, 4132 // which is eagerly done for every method, so we might as well do it now, 4133 // when everything is fresh in memory.) 4134 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { 4135 for (int j = 0; j < methods->length(); j++) { 4136 methods->at(j)->init_intrinsic_id(); 4137 } 4138 } 4139 4140 if (cached_class_file != NULL) { 4141 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4142 this_klass->set_cached_class_file(cached_class_file); 4143 } 4144 4145 // Fill in field values obtained by parse_classfile_attributes 4146 if (parsed_annotations.has_any_annotations()) 4147 parsed_annotations.apply_to(this_klass); 4148 apply_parsed_class_attributes(this_klass); 4149 4150 // Miranda methods 4151 if ((num_miranda_methods > 0) || 4152 // if this class introduced new miranda methods or 4153 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4154 // super class exists and this class inherited miranda methods 4155 ) { 4156 this_klass->set_has_miranda_methods(); // then set a flag 4157 } 4158 4159 // Fill in information needed to compute superclasses. 4160 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4161 4162 // Initialize itable offset tables 4163 klassItable::setup_itable_offset_table(this_klass); 4164 4165 // Compute transitive closure of interfaces this class implements 4166 // Do final class setup 4167 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4168 4169 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4170 set_precomputed_flags(this_klass); 4171 4172 // reinitialize modifiers, using the InnerClasses attribute 4173 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4174 this_klass->set_modifier_flags(computed_modifiers); 4175 4176 // check if this class can access its super class 4177 check_super_class_access(this_klass, CHECK_(nullHandle)); 4178 4179 // check if this class can access its superinterfaces 4180 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4181 4182 // check if this class overrides any final method 4183 check_final_method_override(this_klass, CHECK_(nullHandle)); 4184 4185 // check that if this class is an interface then it doesn't have static methods 4186 if (this_klass->is_interface()) { 4187 /* An interface in a JAVA 8 classfile can be static */ 4188 if (_major_version < JAVA_8_VERSION) { 4189 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4190 } 4191 } 4192 4193 // Allocate mirror and initialize static fields 4194 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, 4195 CHECK_(nullHandle)); 4196 4197 // Generate any default methods - default methods are interface methods 4198 // that have a default implementation. This is new with Lambda project. 4199 if (has_default_methods ) { 4200 DefaultMethods::generate_default_methods( 4201 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4202 } 4203 4204 // Update the loader_data graph. 4205 record_defined_class_dependencies(this_klass, CHECK_NULL); 4206 4207 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4208 false /* not shared class */); 4209 4210 if (TraceClassLoading) { 4211 ResourceMark rm; 4212 // print in a single call to reduce interleaving of output 4213 if (cfs->source() != NULL) { 4214 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4215 cfs->source()); 4216 } else if (class_loader.is_null()) { 4217 Klass* caller = 4218 THREAD->is_Java_thread() 4219 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 4220 : NULL; 4221 // caller can be NULL, for example, during a JVMTI VM_Init hook 4222 if (caller != NULL) { 4223 tty->print("[Loaded %s by instance of %s]\n", 4224 this_klass->external_name(), 4225 InstanceKlass::cast(caller)->external_name()); 4226 } else { 4227 tty->print("[Loaded %s]\n", this_klass->external_name()); 4228 } 4229 } else { 4230 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4231 InstanceKlass::cast(class_loader->klass())->external_name()); 4232 } 4233 } 4234 4235 if (TraceClassResolution) { 4236 ResourceMark rm; 4237 // print out the superclass. 4238 const char * from = this_klass()->external_name(); 4239 if (this_klass->java_super() != NULL) { 4240 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4241 } 4242 // print out each of the interface classes referred to by this class. 4243 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4244 if (local_interfaces != NULL) { 4245 int length = local_interfaces->length(); 4246 for (int i = 0; i < length; i++) { 4247 Klass* k = local_interfaces->at(i); 4248 InstanceKlass* to_class = InstanceKlass::cast(k); 4249 const char * to = to_class->external_name(); 4250 tty->print("RESOLVE %s %s (interface)\n", from, to); 4251 } 4252 } 4253 } 4254 4255 // preserve result across HandleMark 4256 preserve_this_klass = this_klass(); 4257 } 4258 4259 // Create new handle outside HandleMark (might be needed for 4260 // Extended Class Redefinition) 4261 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4262 debug_only(this_klass->verify();) 4263 4264 // Clear class if no error has occurred so destructor doesn't deallocate it 4265 _klass = NULL; 4266 return this_klass; 4267 } 4268 4269 // Destructor to clean up if there's an error 4270 ClassFileParser::~ClassFileParser() { 4271 MetadataFactory::free_metadata(_loader_data, _cp); 4272 MetadataFactory::free_array<u2>(_loader_data, _fields); 4273 4274 // Free methods 4275 InstanceKlass::deallocate_methods(_loader_data, _methods); 4276 4277 // beware of the Universe::empty_blah_array!! 4278 if (_inner_classes != Universe::the_empty_short_array()) { 4279 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4280 } 4281 4282 // Free interfaces 4283 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4284 _local_interfaces, _transitive_interfaces); 4285 4286 if (_combined_annotations != NULL) { 4287 // After all annotations arrays have been created, they are installed into the 4288 // Annotations object that will be assigned to the InstanceKlass being created. 4289 4290 // Deallocate the Annotations object and the installed annotations arrays. 4291 _combined_annotations->deallocate_contents(_loader_data); 4292 4293 // If the _combined_annotations pointer is non-NULL, 4294 // then the other annotations fields should have been cleared. 4295 assert(_annotations == NULL, "Should have been cleared"); 4296 assert(_type_annotations == NULL, "Should have been cleared"); 4297 assert(_fields_annotations == NULL, "Should have been cleared"); 4298 assert(_fields_type_annotations == NULL, "Should have been cleared"); 4299 } else { 4300 // If the annotations arrays were not installed into the Annotations object, 4301 // then they have to be deallocated explicitly. 4302 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4303 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4304 Annotations::free_contents(_loader_data, _fields_annotations); 4305 Annotations::free_contents(_loader_data, _fields_type_annotations); 4306 } 4307 4308 clear_class_metadata(); 4309 4310 // deallocate the klass if already created. Don't directly deallocate, but add 4311 // to the deallocate list so that the klass is removed from the CLD::_klasses list 4312 // at a safepoint. 4313 if (_klass != NULL) { 4314 _loader_data->add_to_deallocate_list(_klass); 4315 } 4316 _klass = NULL; 4317 } 4318 4319 void ClassFileParser::print_field_layout(Symbol* name, 4320 Array<u2>* fields, 4321 constantPoolHandle cp, 4322 int instance_size, 4323 int instance_fields_start, 4324 int instance_fields_end, 4325 int static_fields_end) { 4326 tty->print("%s: field layout\n", name->as_klass_external_name()); 4327 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4328 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4329 if (!fs.access_flags().is_static()) { 4330 tty->print(" @%3d \"%s\" %s\n", 4331 fs.offset(), 4332 fs.name()->as_klass_external_name(), 4333 fs.signature()->as_klass_external_name()); 4334 } 4335 } 4336 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4337 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4338 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4339 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4340 if (fs.access_flags().is_static()) { 4341 tty->print(" @%3d \"%s\" %s\n", 4342 fs.offset(), 4343 fs.name()->as_klass_external_name(), 4344 fs.signature()->as_klass_external_name()); 4345 } 4346 } 4347 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4348 tty->print("\n"); 4349 } 4350 4351 unsigned int 4352 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4353 unsigned int nonstatic_oop_map_count, 4354 int first_nonstatic_oop_offset) { 4355 unsigned int map_count = 4356 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4357 if (nonstatic_oop_map_count > 0) { 4358 // We have oops to add to map 4359 if (map_count == 0) { 4360 map_count = nonstatic_oop_map_count; 4361 } else { 4362 // Check whether we should add a new map block or whether the last one can 4363 // be extended 4364 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4365 OopMapBlock* const last_map = first_map + map_count - 1; 4366 4367 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4368 if (next_offset == first_nonstatic_oop_offset) { 4369 // There is no gap bettwen superklass's last oop field and first 4370 // local oop field, merge maps. 4371 nonstatic_oop_map_count -= 1; 4372 } else { 4373 // Superklass didn't end with a oop field, add extra maps 4374 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4375 } 4376 map_count += nonstatic_oop_map_count; 4377 } 4378 } 4379 return map_count; 4380 } 4381 4382 4383 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4384 unsigned int nonstatic_oop_map_count, 4385 int* nonstatic_oop_offsets, 4386 unsigned int* nonstatic_oop_counts) { 4387 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4388 const InstanceKlass* const super = k->superklass(); 4389 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4390 if (super_count > 0) { 4391 // Copy maps from superklass 4392 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4393 for (unsigned int i = 0; i < super_count; ++i) { 4394 *this_oop_map++ = *super_oop_map++; 4395 } 4396 } 4397 4398 if (nonstatic_oop_map_count > 0) { 4399 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4400 // The counts differ because there is no gap between superklass's last oop 4401 // field and the first local oop field. Extend the last oop map copied 4402 // from the superklass instead of creating new one. 4403 nonstatic_oop_map_count--; 4404 nonstatic_oop_offsets++; 4405 this_oop_map--; 4406 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4407 this_oop_map++; 4408 } 4409 4410 // Add new map blocks, fill them 4411 while (nonstatic_oop_map_count-- > 0) { 4412 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4413 this_oop_map->set_count(*nonstatic_oop_counts++); 4414 this_oop_map++; 4415 } 4416 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4417 this_oop_map, "sanity"); 4418 } 4419 } 4420 4421 4422 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4423 Klass* super = k->super(); 4424 4425 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4426 // in which case we don't have to register objects as finalizable 4427 if (!_has_empty_finalizer) { 4428 if (_has_finalizer || 4429 (super != NULL && super->has_finalizer())) { 4430 k->set_has_finalizer(); 4431 } 4432 } 4433 4434 #ifdef ASSERT 4435 bool f = false; 4436 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4437 vmSymbols::void_method_signature()); 4438 if (m != NULL && !m->is_empty_method()) { 4439 f = true; 4440 } 4441 4442 // Spec doesn't prevent agent from redefinition of empty finalizer. 4443 // Despite the fact that it's generally bad idea and redefined finalizer 4444 // will not work as expected we shouldn't abort vm in this case 4445 if (!k->has_redefined_this_or_super()) { 4446 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4447 } 4448 #endif 4449 4450 // Check if this klass supports the java.lang.Cloneable interface 4451 if (SystemDictionary::Cloneable_klass_loaded()) { 4452 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4453 k->set_is_cloneable(); 4454 } 4455 } 4456 4457 // Check if this klass has a vanilla default constructor 4458 if (super == NULL) { 4459 // java.lang.Object has empty default constructor 4460 k->set_has_vanilla_constructor(); 4461 } else { 4462 if (super->has_vanilla_constructor() && 4463 _has_vanilla_constructor) { 4464 k->set_has_vanilla_constructor(); 4465 } 4466 #ifdef ASSERT 4467 bool v = false; 4468 if (super->has_vanilla_constructor()) { 4469 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4470 ), vmSymbols::void_method_signature()); 4471 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4472 v = true; 4473 } 4474 } 4475 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4476 #endif 4477 } 4478 4479 // If it cannot be fast-path allocated, set a bit in the layout helper. 4480 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4481 assert(k->size_helper() > 0, "layout_helper is initialized"); 4482 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4483 || k->is_abstract() || k->is_interface() 4484 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4485 || k->size_helper() >= FastAllocateSizeLimit) { 4486 // Forbid fast-path allocation. 4487 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4488 k->set_layout_helper(lh); 4489 } 4490 } 4491 4492 // Attach super classes and interface classes to class loader data 4493 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4494 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4495 if (defining_loader_data->is_the_null_class_loader_data()) { 4496 // Dependencies to null class loader data are implicit. 4497 return; 4498 } else { 4499 // add super class dependency 4500 Klass* super = defined_klass->super(); 4501 if (super != NULL) { 4502 defining_loader_data->record_dependency(super, CHECK); 4503 } 4504 4505 // add super interface dependencies 4506 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4507 if (local_interfaces != NULL) { 4508 int length = local_interfaces->length(); 4509 for (int i = 0; i < length; i++) { 4510 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4511 } 4512 } 4513 } 4514 } 4515 4516 // utility methods for appending an array with check for duplicates 4517 4518 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4519 // iterate over new interfaces 4520 for (int i = 0; i < ifs->length(); i++) { 4521 Klass* e = ifs->at(i); 4522 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4523 // add new interface 4524 result->append_if_missing(e); 4525 } 4526 } 4527 4528 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4529 instanceKlassHandle super, 4530 Array<Klass*>* local_ifs, TRAPS) { 4531 // Compute maximum size for transitive interfaces 4532 int max_transitive_size = 0; 4533 int super_size = 0; 4534 // Add superclass transitive interfaces size 4535 if (super.not_null()) { 4536 super_size = super->transitive_interfaces()->length(); 4537 max_transitive_size += super_size; 4538 } 4539 // Add local interfaces' super interfaces 4540 int local_size = local_ifs->length(); 4541 for (int i = 0; i < local_size; i++) { 4542 Klass* l = local_ifs->at(i); 4543 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4544 } 4545 // Finally add local interfaces 4546 max_transitive_size += local_size; 4547 // Construct array 4548 if (max_transitive_size == 0) { 4549 // no interfaces, use canonicalized array 4550 return Universe::the_empty_klass_array(); 4551 } else if (max_transitive_size == super_size) { 4552 // no new local interfaces added, share superklass' transitive interface array 4553 return super->transitive_interfaces(); 4554 } else if (max_transitive_size == local_size) { 4555 // only local interfaces added, share local interface array 4556 return local_ifs; 4557 } else { 4558 ResourceMark rm; 4559 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4560 4561 // Copy down from superclass 4562 if (super.not_null()) { 4563 append_interfaces(result, super->transitive_interfaces()); 4564 } 4565 4566 // Copy down from local interfaces' superinterfaces 4567 for (int i = 0; i < local_ifs->length(); i++) { 4568 Klass* l = local_ifs->at(i); 4569 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4570 } 4571 // Finally add local interfaces 4572 append_interfaces(result, local_ifs); 4573 4574 // length will be less than the max_transitive_size if duplicates were removed 4575 int length = result->length(); 4576 assert(length <= max_transitive_size, "just checking"); 4577 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4578 for (int i = 0; i < length; i++) { 4579 Klass* e = result->at(i); 4580 assert(e != NULL, "just checking"); 4581 new_result->at_put(i, e); 4582 } 4583 return new_result; 4584 } 4585 } 4586 4587 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4588 Klass* super = this_klass->super(); 4589 if ((super != NULL) && 4590 (!Reflection::verify_class_access(this_klass(), super, false))) { 4591 ResourceMark rm(THREAD); 4592 Exceptions::fthrow( 4593 THREAD_AND_LOCATION, 4594 vmSymbols::java_lang_IllegalAccessError(), 4595 "class %s cannot access its superclass %s", 4596 this_klass->external_name(), 4597 InstanceKlass::cast(super)->external_name() 4598 ); 4599 return; 4600 } 4601 } 4602 4603 4604 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4605 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4606 int lng = local_interfaces->length(); 4607 for (int i = lng - 1; i >= 0; i--) { 4608 Klass* k = local_interfaces->at(i); 4609 assert (k != NULL && k->is_interface(), "invalid interface"); 4610 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4611 ResourceMark rm(THREAD); 4612 Exceptions::fthrow( 4613 THREAD_AND_LOCATION, 4614 vmSymbols::java_lang_IllegalAccessError(), 4615 "class %s cannot access its superinterface %s", 4616 this_klass->external_name(), 4617 InstanceKlass::cast(k)->external_name() 4618 ); 4619 return; 4620 } 4621 } 4622 } 4623 4624 4625 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4626 Array<Method*>* methods = this_klass->methods(); 4627 int num_methods = methods->length(); 4628 4629 // go thru each method and check if it overrides a final method 4630 for (int index = 0; index < num_methods; index++) { 4631 Method* m = methods->at(index); 4632 4633 // skip private, static, and <init> methods 4634 if ((!m->is_private() && !m->is_static()) && 4635 (m->name() != vmSymbols::object_initializer_name())) { 4636 4637 Symbol* name = m->name(); 4638 Symbol* signature = m->signature(); 4639 Klass* k = this_klass->super(); 4640 Method* super_m = NULL; 4641 while (k != NULL) { 4642 // skip supers that don't have final methods. 4643 if (k->has_final_method()) { 4644 // lookup a matching method in the super class hierarchy 4645 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4646 if (super_m == NULL) { 4647 break; // didn't find any match; get out 4648 } 4649 4650 if (super_m->is_final() && !super_m->is_static() && 4651 // matching method in super is final, and not static 4652 (Reflection::verify_field_access(this_klass(), 4653 super_m->method_holder(), 4654 super_m->method_holder(), 4655 super_m->access_flags(), false)) 4656 // this class can access super final method and therefore override 4657 ) { 4658 ResourceMark rm(THREAD); 4659 Exceptions::fthrow( 4660 THREAD_AND_LOCATION, 4661 vmSymbols::java_lang_VerifyError(), 4662 "class %s overrides final method %s.%s%s", 4663 this_klass->external_name(), 4664 super_m->method_holder()->external_name(), 4665 name->as_C_string(), 4666 signature->as_C_string() 4667 ); 4668 return; 4669 } 4670 4671 // continue to look from super_m's holder's super. 4672 k = super_m->method_holder()->super(); 4673 continue; 4674 } 4675 4676 k = k->super(); 4677 } 4678 } 4679 } 4680 } 4681 4682 4683 // assumes that this_klass is an interface 4684 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4685 assert(this_klass->is_interface(), "not an interface"); 4686 Array<Method*>* methods = this_klass->methods(); 4687 int num_methods = methods->length(); 4688 4689 for (int index = 0; index < num_methods; index++) { 4690 Method* m = methods->at(index); 4691 // if m is static and not the init method, throw a verify error 4692 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4693 ResourceMark rm(THREAD); 4694 Exceptions::fthrow( 4695 THREAD_AND_LOCATION, 4696 vmSymbols::java_lang_VerifyError(), 4697 "Illegal static method %s in interface %s", 4698 m->name()->as_C_string(), 4699 this_klass->external_name() 4700 ); 4701 return; 4702 } 4703 } 4704 } 4705 4706 // utility methods for format checking 4707 4708 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4709 if (!_need_verify) { return; } 4710 4711 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4712 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4713 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4714 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4715 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4716 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4717 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4718 4719 if ((is_abstract && is_final) || 4720 (is_interface && !is_abstract) || 4721 (is_interface && major_gte_15 && (is_super || is_enum)) || 4722 (!is_interface && major_gte_15 && is_annotation)) { 4723 ResourceMark rm(THREAD); 4724 Exceptions::fthrow( 4725 THREAD_AND_LOCATION, 4726 vmSymbols::java_lang_ClassFormatError(), 4727 "Illegal class modifiers in class %s: 0x%X", 4728 _class_name->as_C_string(), flags 4729 ); 4730 return; 4731 } 4732 } 4733 4734 bool ClassFileParser::has_illegal_visibility(jint flags) { 4735 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4736 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4737 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4738 4739 return ((is_public && is_protected) || 4740 (is_public && is_private) || 4741 (is_protected && is_private)); 4742 } 4743 4744 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4745 u2 max_version = JAVA_MAX_SUPPORTED_VERSION; 4746 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4747 (major <= max_version) && 4748 ((major != max_version) || 4749 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4750 } 4751 4752 void ClassFileParser::verify_legal_field_modifiers( 4753 jint flags, bool is_interface, TRAPS) { 4754 if (!_need_verify) { return; } 4755 4756 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4757 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4758 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4759 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4760 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4761 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4762 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4763 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4764 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4765 4766 bool is_illegal = false; 4767 4768 if (is_interface) { 4769 if (!is_public || !is_static || !is_final || is_private || 4770 is_protected || is_volatile || is_transient || 4771 (major_gte_15 && is_enum)) { 4772 is_illegal = true; 4773 } 4774 } else { // not interface 4775 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4776 is_illegal = true; 4777 } 4778 } 4779 4780 if (is_illegal) { 4781 ResourceMark rm(THREAD); 4782 Exceptions::fthrow( 4783 THREAD_AND_LOCATION, 4784 vmSymbols::java_lang_ClassFormatError(), 4785 "Illegal field modifiers in class %s: 0x%X", 4786 _class_name->as_C_string(), flags); 4787 return; 4788 } 4789 } 4790 4791 void ClassFileParser::verify_legal_method_modifiers( 4792 jint flags, bool is_interface, Symbol* name, TRAPS) { 4793 if (!_need_verify) { return; } 4794 4795 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4796 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4797 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4798 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4799 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4800 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4801 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4802 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4803 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4804 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4805 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4806 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4807 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4808 4809 bool is_illegal = false; 4810 4811 if (is_interface) { 4812 if (major_gte_8) { 4813 // Class file version is JAVA_8_VERSION or later Methods of 4814 // interfaces may set any of the flags except ACC_PROTECTED, 4815 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4816 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4817 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4818 (is_native || is_protected || is_final || is_synchronized) || 4819 // If a specific method of a class or interface has its 4820 // ACC_ABSTRACT flag set, it must not have any of its 4821 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4822 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4823 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4824 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4825 (is_abstract && (is_private || is_static || is_strict))) { 4826 is_illegal = true; 4827 } 4828 } else if (major_gte_15) { 4829 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4830 if (!is_public || is_static || is_final || is_synchronized || 4831 is_native || !is_abstract || is_strict) { 4832 is_illegal = true; 4833 } 4834 } else { 4835 // Class file version is pre-JAVA_1_5_VERSION 4836 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4837 is_illegal = true; 4838 } 4839 } 4840 } else { // not interface 4841 if (has_illegal_visibility(flags)) { 4842 is_illegal = true; 4843 } else { 4844 if (is_initializer) { 4845 if (is_static || is_final || is_synchronized || is_native || 4846 is_abstract || (major_gte_15 && is_bridge)) { 4847 is_illegal = true; 4848 } 4849 } else { // not initializer 4850 if (is_abstract) { 4851 if ((is_final || is_native || is_private || is_static || 4852 (major_gte_15 && (is_synchronized || is_strict)))) { 4853 is_illegal = true; 4854 } 4855 } 4856 } 4857 } 4858 } 4859 4860 if (is_illegal) { 4861 ResourceMark rm(THREAD); 4862 Exceptions::fthrow( 4863 THREAD_AND_LOCATION, 4864 vmSymbols::java_lang_ClassFormatError(), 4865 "Method %s in class %s has illegal modifiers: 0x%X", 4866 name->as_C_string(), _class_name->as_C_string(), flags); 4867 return; 4868 } 4869 } 4870 4871 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4872 assert(_need_verify, "only called when _need_verify is true"); 4873 int i = 0; 4874 int count = length >> 2; 4875 for (int k=0; k<count; k++) { 4876 unsigned char b0 = buffer[i]; 4877 unsigned char b1 = buffer[i+1]; 4878 unsigned char b2 = buffer[i+2]; 4879 unsigned char b3 = buffer[i+3]; 4880 // For an unsigned char v, 4881 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4882 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4883 unsigned char res = b0 | b0 - 1 | 4884 b1 | b1 - 1 | 4885 b2 | b2 - 1 | 4886 b3 | b3 - 1; 4887 if (res >= 128) break; 4888 i += 4; 4889 } 4890 for(; i < length; i++) { 4891 unsigned short c; 4892 // no embedded zeros 4893 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4894 if(buffer[i] < 128) { 4895 continue; 4896 } 4897 if ((i + 5) < length) { // see if it's legal supplementary character 4898 if (UTF8::is_supplementary_character(&buffer[i])) { 4899 c = UTF8::get_supplementary_character(&buffer[i]); 4900 i += 5; 4901 continue; 4902 } 4903 } 4904 switch (buffer[i] >> 4) { 4905 default: break; 4906 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4907 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4908 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4909 c = (buffer[i] & 0x1F) << 6; 4910 i++; 4911 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4912 c += buffer[i] & 0x3F; 4913 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4914 // for classes with major > 47, c must a null or a character in its shortest form 4915 break; 4916 } 4917 } 4918 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4919 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4920 c = (buffer[i] & 0xF) << 12; 4921 i += 2; 4922 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4923 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4924 if (_major_version <= 47 || c >= 0x800) { 4925 // for classes with major > 47, c must be in its shortest form 4926 break; 4927 } 4928 } 4929 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4930 } // end of switch 4931 } // end of for 4932 } 4933 4934 // Checks if name is a legal class name. 4935 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4936 if (!_need_verify || _relax_verify) { return; } 4937 4938 char buf[fixed_buffer_size]; 4939 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4940 unsigned int length = name->utf8_length(); 4941 bool legal = false; 4942 4943 if (length > 0) { 4944 char* p; 4945 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4946 p = skip_over_field_signature(bytes, false, length, CHECK); 4947 legal = (p != NULL) && ((p - bytes) == (int)length); 4948 } else if (_major_version < JAVA_1_5_VERSION) { 4949 if (bytes[0] != '<') { 4950 p = skip_over_field_name(bytes, true, length); 4951 legal = (p != NULL) && ((p - bytes) == (int)length); 4952 } 4953 } else { 4954 // 4900761: relax the constraints based on JSR202 spec 4955 // Class names may be drawn from the entire Unicode character set. 4956 // Identifiers between '/' must be unqualified names. 4957 // The utf8 string has been verified when parsing cpool entries. 4958 legal = verify_unqualified_name(bytes, length, LegalClass); 4959 } 4960 } 4961 if (!legal) { 4962 ResourceMark rm(THREAD); 4963 Exceptions::fthrow( 4964 THREAD_AND_LOCATION, 4965 vmSymbols::java_lang_ClassFormatError(), 4966 "Illegal class name \"%s\" in class file %s", bytes, 4967 _class_name->as_C_string() 4968 ); 4969 return; 4970 } 4971 } 4972 4973 // Checks if name is a legal field name. 4974 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 4975 if (!_need_verify || _relax_verify) { return; } 4976 4977 char buf[fixed_buffer_size]; 4978 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4979 unsigned int length = name->utf8_length(); 4980 bool legal = false; 4981 4982 if (length > 0) { 4983 if (_major_version < JAVA_1_5_VERSION) { 4984 if (bytes[0] != '<') { 4985 char* p = skip_over_field_name(bytes, false, length); 4986 legal = (p != NULL) && ((p - bytes) == (int)length); 4987 } 4988 } else { 4989 // 4881221: relax the constraints based on JSR202 spec 4990 legal = verify_unqualified_name(bytes, length, LegalField); 4991 } 4992 } 4993 4994 if (!legal) { 4995 ResourceMark rm(THREAD); 4996 Exceptions::fthrow( 4997 THREAD_AND_LOCATION, 4998 vmSymbols::java_lang_ClassFormatError(), 4999 "Illegal field name \"%s\" in class %s", bytes, 5000 _class_name->as_C_string() 5001 ); 5002 return; 5003 } 5004 } 5005 5006 // Checks if name is a legal method name. 5007 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 5008 if (!_need_verify || _relax_verify) { return; } 5009 5010 assert(name != NULL, "method name is null"); 5011 char buf[fixed_buffer_size]; 5012 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5013 unsigned int length = name->utf8_length(); 5014 bool legal = false; 5015 5016 if (length > 0) { 5017 if (bytes[0] == '<') { 5018 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5019 legal = true; 5020 } 5021 } else if (_major_version < JAVA_1_5_VERSION) { 5022 char* p; 5023 p = skip_over_field_name(bytes, false, length); 5024 legal = (p != NULL) && ((p - bytes) == (int)length); 5025 } else { 5026 // 4881221: relax the constraints based on JSR202 spec 5027 legal = verify_unqualified_name(bytes, length, LegalMethod); 5028 } 5029 } 5030 5031 if (!legal) { 5032 ResourceMark rm(THREAD); 5033 Exceptions::fthrow( 5034 THREAD_AND_LOCATION, 5035 vmSymbols::java_lang_ClassFormatError(), 5036 "Illegal method name \"%s\" in class %s", bytes, 5037 _class_name->as_C_string() 5038 ); 5039 return; 5040 } 5041 } 5042 5043 5044 // Checks if signature is a legal field signature. 5045 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 5046 if (!_need_verify) { return; } 5047 5048 char buf[fixed_buffer_size]; 5049 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5050 unsigned int length = signature->utf8_length(); 5051 char* p = skip_over_field_signature(bytes, false, length, CHECK); 5052 5053 if (p == NULL || (p - bytes) != (int)length) { 5054 throwIllegalSignature("Field", name, signature, CHECK); 5055 } 5056 } 5057 5058 // Checks if signature is a legal method signature. 5059 // Returns number of parameters 5060 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 5061 if (!_need_verify) { 5062 // make sure caller's args_size will be less than 0 even for non-static 5063 // method so it will be recomputed in compute_size_of_parameters(). 5064 return -2; 5065 } 5066 5067 unsigned int args_size = 0; 5068 char buf[fixed_buffer_size]; 5069 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5070 unsigned int length = signature->utf8_length(); 5071 char* nextp; 5072 5073 // The first character must be a '(' 5074 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5075 length--; 5076 // Skip over legal field signatures 5077 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5078 while ((length > 0) && (nextp != NULL)) { 5079 args_size++; 5080 if (p[0] == 'J' || p[0] == 'D') { 5081 args_size++; 5082 } 5083 length -= nextp - p; 5084 p = nextp; 5085 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5086 } 5087 // The first non-signature thing better be a ')' 5088 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5089 length--; 5090 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5091 // All internal methods must return void 5092 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5093 return args_size; 5094 } 5095 } else { 5096 // Now we better just have a return value 5097 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5098 if (nextp && ((int)length == (nextp - p))) { 5099 return args_size; 5100 } 5101 } 5102 } 5103 } 5104 // Report error 5105 throwIllegalSignature("Method", name, signature, CHECK_0); 5106 return 0; 5107 } 5108 5109 5110 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5111 // Method names also may not contain the characters '<' or '>', unless <init> 5112 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5113 // method. Because these names have been checked as special cases before 5114 // calling this method in verify_legal_method_name. 5115 bool ClassFileParser::verify_unqualified_name( 5116 char* name, unsigned int length, int type) { 5117 jchar ch; 5118 5119 for (char* p = name; p != name + length; ) { 5120 ch = *p; 5121 if (ch < 128) { 5122 p++; 5123 if (ch == '.' || ch == ';' || ch == '[' ) { 5124 return false; // do not permit '.', ';', or '[' 5125 } 5126 if (type != LegalClass && ch == '/') { 5127 return false; // do not permit '/' unless it's class name 5128 } 5129 if (type == LegalMethod && (ch == '<' || ch == '>')) { 5130 return false; // do not permit '<' or '>' in method names 5131 } 5132 } else { 5133 char* tmp_p = UTF8::next(p, &ch); 5134 p = tmp_p; 5135 } 5136 } 5137 return true; 5138 } 5139 5140 5141 // Take pointer to a string. Skip over the longest part of the string that could 5142 // be taken as a fieldname. Allow '/' if slash_ok is true. 5143 // Return a pointer to just past the fieldname. 5144 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5145 // being true, we saw consecutive slashes (meaning we were looking for a 5146 // qualified path but found something that was badly-formed). 5147 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5148 char* p; 5149 jchar ch; 5150 jboolean last_is_slash = false; 5151 jboolean not_first_ch = false; 5152 5153 for (p = name; p != name + length; not_first_ch = true) { 5154 char* old_p = p; 5155 ch = *p; 5156 if (ch < 128) { 5157 p++; 5158 // quick check for ascii 5159 if ((ch >= 'a' && ch <= 'z') || 5160 (ch >= 'A' && ch <= 'Z') || 5161 (ch == '_' || ch == '$') || 5162 (not_first_ch && ch >= '0' && ch <= '9')) { 5163 last_is_slash = false; 5164 continue; 5165 } 5166 if (slash_ok && ch == '/') { 5167 if (last_is_slash) { 5168 return NULL; // Don't permit consecutive slashes 5169 } 5170 last_is_slash = true; 5171 continue; 5172 } 5173 } else { 5174 jint unicode_ch; 5175 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5176 p = tmp_p; 5177 last_is_slash = false; 5178 // Check if ch is Java identifier start or is Java identifier part 5179 // 4672820: call java.lang.Character methods directly without generating separate tables. 5180 EXCEPTION_MARK; 5181 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5182 5183 // return value 5184 JavaValue result(T_BOOLEAN); 5185 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5186 JavaCallArguments args; 5187 args.push_int(unicode_ch); 5188 5189 // public static boolean isJavaIdentifierStart(char ch); 5190 JavaCalls::call_static(&result, 5191 klass, 5192 vmSymbols::isJavaIdentifierStart_name(), 5193 vmSymbols::int_bool_signature(), 5194 &args, 5195 THREAD); 5196 5197 if (HAS_PENDING_EXCEPTION) { 5198 CLEAR_PENDING_EXCEPTION; 5199 return 0; 5200 } 5201 if (result.get_jboolean()) { 5202 continue; 5203 } 5204 5205 if (not_first_ch) { 5206 // public static boolean isJavaIdentifierPart(char ch); 5207 JavaCalls::call_static(&result, 5208 klass, 5209 vmSymbols::isJavaIdentifierPart_name(), 5210 vmSymbols::int_bool_signature(), 5211 &args, 5212 THREAD); 5213 5214 if (HAS_PENDING_EXCEPTION) { 5215 CLEAR_PENDING_EXCEPTION; 5216 return 0; 5217 } 5218 5219 if (result.get_jboolean()) { 5220 continue; 5221 } 5222 } 5223 } 5224 return (not_first_ch) ? old_p : NULL; 5225 } 5226 return (not_first_ch) ? p : NULL; 5227 } 5228 5229 5230 // Take pointer to a string. Skip over the longest part of the string that could 5231 // be taken as a field signature. Allow "void" if void_ok. 5232 // Return a pointer to just past the signature. 5233 // Return NULL if no legal signature is found. 5234 char* ClassFileParser::skip_over_field_signature(char* signature, 5235 bool void_ok, 5236 unsigned int length, 5237 TRAPS) { 5238 unsigned int array_dim = 0; 5239 while (length > 0) { 5240 switch (signature[0]) { 5241 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5242 case JVM_SIGNATURE_BOOLEAN: 5243 case JVM_SIGNATURE_BYTE: 5244 case JVM_SIGNATURE_CHAR: 5245 case JVM_SIGNATURE_SHORT: 5246 case JVM_SIGNATURE_INT: 5247 case JVM_SIGNATURE_FLOAT: 5248 case JVM_SIGNATURE_LONG: 5249 case JVM_SIGNATURE_DOUBLE: 5250 return signature + 1; 5251 case JVM_SIGNATURE_CLASS: { 5252 if (_major_version < JAVA_1_5_VERSION) { 5253 // Skip over the class name if one is there 5254 char* p = skip_over_field_name(signature + 1, true, --length); 5255 5256 // The next character better be a semicolon 5257 if (p && (p - signature) > 1 && p[0] == ';') { 5258 return p + 1; 5259 } 5260 } else { 5261 // 4900761: For class version > 48, any unicode is allowed in class name. 5262 length--; 5263 signature++; 5264 while (length > 0 && signature[0] != ';') { 5265 if (signature[0] == '.') { 5266 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5267 } 5268 length--; 5269 signature++; 5270 } 5271 if (signature[0] == ';') { return signature + 1; } 5272 } 5273 5274 return NULL; 5275 } 5276 case JVM_SIGNATURE_ARRAY: 5277 array_dim++; 5278 if (array_dim > 255) { 5279 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5280 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5281 } 5282 // The rest of what's there better be a legal signature 5283 signature++; 5284 length--; 5285 void_ok = false; 5286 break; 5287 5288 default: 5289 return NULL; 5290 } 5291 } 5292 return NULL; 5293 }