1 /* 2 * Copyright (c) 1997, 2026, 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 "cds/cdsConfig.hpp" 26 #include "classfile/classFileParser.hpp" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/classLoadInfo.hpp" 31 #include "classfile/defaultMethods.hpp" 32 #include "classfile/fieldLayoutBuilder.hpp" 33 #include "classfile/javaClasses.inline.hpp" 34 #include "classfile/moduleEntry.hpp" 35 #include "classfile/packageEntry.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/verificationType.hpp" 39 #include "classfile/verifier.hpp" 40 #include "classfile/vmClasses.hpp" 41 #include "classfile/vmSymbols.hpp" 42 #include "jvm.h" 43 #include "logging/log.hpp" 44 #include "logging/logStream.hpp" 45 #include "memory/allocation.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/resourceArea.hpp" 49 #include "memory/universe.hpp" 50 #include "oops/annotations.hpp" 51 #include "oops/bsmAttribute.inline.hpp" 52 #include "oops/constantPool.inline.hpp" 53 #include "oops/fieldInfo.hpp" 54 #include "oops/fieldStreams.inline.hpp" 55 #include "oops/inlineKlass.inline.hpp" 56 #include "oops/instanceKlass.inline.hpp" 57 #include "oops/instanceMirrorKlass.hpp" 58 #include "oops/klass.inline.hpp" 59 #include "oops/klassVtable.hpp" 60 #include "oops/metadata.hpp" 61 #include "oops/method.inline.hpp" 62 #include "oops/oop.inline.hpp" 63 #include "oops/recordComponent.hpp" 64 #include "oops/symbol.hpp" 65 #include "prims/jvmtiExport.hpp" 66 #include "prims/jvmtiThreadState.hpp" 67 #include "runtime/arguments.hpp" 68 #include "runtime/fieldDescriptor.inline.hpp" 69 #include "runtime/handles.inline.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/os.hpp" 72 #include "runtime/perfData.hpp" 73 #include "runtime/reflection.hpp" 74 #include "runtime/safepointVerifiers.hpp" 75 #include "runtime/signature.hpp" 76 #include "runtime/timer.hpp" 77 #include "services/classLoadingService.hpp" 78 #include "services/threadService.hpp" 79 #include "utilities/align.hpp" 80 #include "utilities/bitMap.inline.hpp" 81 #include "utilities/checkedCast.hpp" 82 #include "utilities/copy.hpp" 83 #include "utilities/exceptions.hpp" 84 #include "utilities/formatBuffer.hpp" 85 #include "utilities/globalDefinitions.hpp" 86 #include "utilities/growableArray.hpp" 87 #include "utilities/hashTable.hpp" 88 #include "utilities/macros.hpp" 89 #include "utilities/ostream.hpp" 90 #include "utilities/stringUtils.hpp" 91 #include "utilities/utf8.hpp" 92 #if INCLUDE_CDS 93 #include "classfile/systemDictionaryShared.hpp" 94 #endif 95 96 // We generally try to create the oops directly when parsing, rather than 97 // allocating temporary data structures and copying the bytes twice. A 98 // temporary area is only needed when parsing utf8 entries in the constant 99 // pool and when parsing line number tables. 100 101 // We add assert in debug mode when class format is not checked. 102 103 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 104 #define JAVA_MIN_SUPPORTED_VERSION 45 105 #define JAVA_PREVIEW_MINOR_VERSION 65535 106 107 // Used for two backward compatibility reasons: 108 // - to check for new additions to the class file format in JDK1.5 109 // - to check for bug fixes in the format checker in JDK1.5 110 #define JAVA_1_5_VERSION 49 111 112 // Used for backward compatibility reasons: 113 // - to check for javac bug fixes that happened after 1.5 114 // - also used as the max version when running in jdk6 115 #define JAVA_6_VERSION 50 116 117 // Used for backward compatibility reasons: 118 // - to disallow argument and require ACC_STATIC for <clinit> methods 119 #define JAVA_7_VERSION 51 120 121 // Extension method support. 122 #define JAVA_8_VERSION 52 123 124 #define JAVA_9_VERSION 53 125 126 #define JAVA_10_VERSION 54 127 128 #define JAVA_11_VERSION 55 129 130 #define JAVA_12_VERSION 56 131 132 #define JAVA_13_VERSION 57 133 134 #define JAVA_14_VERSION 58 135 136 #define JAVA_15_VERSION 59 137 138 #define JAVA_16_VERSION 60 139 140 #define JAVA_17_VERSION 61 141 142 #define JAVA_18_VERSION 62 143 144 #define JAVA_19_VERSION 63 145 146 #define JAVA_20_VERSION 64 147 148 #define JAVA_21_VERSION 65 149 150 #define JAVA_22_VERSION 66 151 152 #define JAVA_23_VERSION 67 153 154 #define JAVA_24_VERSION 68 155 156 #define JAVA_25_VERSION 69 157 158 #define JAVA_26_VERSION 70 159 160 #define JAVA_27_VERSION 71 161 162 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 163 assert((bad_constant == JVM_CONSTANT_Module || 164 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION, 165 "Unexpected bad constant pool entry"); 166 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 167 } 168 169 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 170 ConstantPool* cp, 171 const int length, 172 TRAPS) { 173 assert(stream != nullptr, "invariant"); 174 assert(cp != nullptr, "invariant"); 175 176 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 177 // this function (_current can be allocated in a register, with scalar 178 // replacement of aggregates). The _current pointer is copied back to 179 // stream() when this function returns. DON'T call another method within 180 // this method that uses stream(). 181 const ClassFileStream cfs1 = *stream; 182 const ClassFileStream* const cfs = &cfs1; 183 184 DEBUG_ONLY(const u1* const old_current = stream->current();) 185 186 // Used for batching symbol allocations. 187 const char* names[SymbolTable::symbol_alloc_batch_size]; 188 int lengths[SymbolTable::symbol_alloc_batch_size]; 189 int indices[SymbolTable::symbol_alloc_batch_size]; 190 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 191 int names_count = 0; 192 193 // parsing Index 0 is unused 194 for (int index = 1; index < length; index++) { 195 // Each of the following case guarantees one more byte in the stream 196 // for the following tag or the access_flags following constant pool, 197 // so we don't need bounds-check for reading tag. 198 const u1 tag = cfs->get_u1_fast(); 199 switch (tag) { 200 case JVM_CONSTANT_Class: { 201 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 202 const u2 name_index = cfs->get_u2_fast(); 203 cp->klass_index_at_put(index, name_index); 204 break; 205 } 206 case JVM_CONSTANT_Fieldref: { 207 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 208 const u2 class_index = cfs->get_u2_fast(); 209 const u2 name_and_type_index = cfs->get_u2_fast(); 210 cp->field_at_put(index, class_index, name_and_type_index); 211 break; 212 } 213 case JVM_CONSTANT_Methodref: { 214 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 215 const u2 class_index = cfs->get_u2_fast(); 216 const u2 name_and_type_index = cfs->get_u2_fast(); 217 cp->method_at_put(index, class_index, name_and_type_index); 218 break; 219 } 220 case JVM_CONSTANT_InterfaceMethodref: { 221 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 222 const u2 class_index = cfs->get_u2_fast(); 223 const u2 name_and_type_index = cfs->get_u2_fast(); 224 cp->interface_method_at_put(index, class_index, name_and_type_index); 225 break; 226 } 227 case JVM_CONSTANT_String : { 228 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 229 const u2 string_index = cfs->get_u2_fast(); 230 cp->string_index_at_put(index, string_index); 231 break; 232 } 233 case JVM_CONSTANT_MethodHandle : 234 case JVM_CONSTANT_MethodType: { 235 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 236 classfile_parse_error( 237 "Class file version does not support constant tag %u in class file %s", 238 tag, THREAD); 239 return; 240 } 241 if (tag == JVM_CONSTANT_MethodHandle) { 242 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 243 const u1 ref_kind = cfs->get_u1_fast(); 244 const u2 method_index = cfs->get_u2_fast(); 245 cp->method_handle_index_at_put(index, ref_kind, method_index); 246 } 247 else if (tag == JVM_CONSTANT_MethodType) { 248 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 249 const u2 signature_index = cfs->get_u2_fast(); 250 cp->method_type_index_at_put(index, signature_index); 251 } 252 else { 253 ShouldNotReachHere(); 254 } 255 break; 256 } 257 case JVM_CONSTANT_Dynamic : { 258 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 259 classfile_parse_error( 260 "Class file version does not support constant tag %u in class file %s", 261 tag, THREAD); 262 return; 263 } 264 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 265 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 266 const u2 name_and_type_index = cfs->get_u2_fast(); 267 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 268 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 269 } 270 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 271 break; 272 } 273 case JVM_CONSTANT_InvokeDynamic : { 274 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 275 classfile_parse_error( 276 "Class file version does not support constant tag %u in class file %s", 277 tag, THREAD); 278 return; 279 } 280 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 281 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 282 const u2 name_and_type_index = cfs->get_u2_fast(); 283 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 284 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 285 } 286 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 287 break; 288 } 289 case JVM_CONSTANT_Integer: { 290 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 291 const u4 bytes = cfs->get_u4_fast(); 292 cp->int_at_put(index, (jint)bytes); 293 break; 294 } 295 case JVM_CONSTANT_Float: { 296 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 297 const u4 bytes = cfs->get_u4_fast(); 298 cp->float_at_put(index, *(jfloat*)&bytes); 299 break; 300 } 301 case JVM_CONSTANT_Long: { 302 // A mangled type might cause you to overrun allocated memory 303 guarantee_property(index + 1 < length, 304 "Invalid constant pool entry %u in class file %s", 305 index, 306 CHECK); 307 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 308 const u8 bytes = cfs->get_u8_fast(); 309 cp->long_at_put(index, bytes); 310 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 311 break; 312 } 313 case JVM_CONSTANT_Double: { 314 // A mangled type might cause you to overrun allocated memory 315 guarantee_property(index+1 < length, 316 "Invalid constant pool entry %u in class file %s", 317 index, 318 CHECK); 319 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 320 const u8 bytes = cfs->get_u8_fast(); 321 cp->double_at_put(index, *(jdouble*)&bytes); 322 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 323 break; 324 } 325 case JVM_CONSTANT_NameAndType: { 326 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 327 const u2 name_index = cfs->get_u2_fast(); 328 const u2 signature_index = cfs->get_u2_fast(); 329 cp->name_and_type_at_put(index, name_index, signature_index); 330 break; 331 } 332 case JVM_CONSTANT_Utf8 : { 333 cfs->guarantee_more(2, CHECK); // utf8_length 334 u2 utf8_length = cfs->get_u2_fast(); 335 const u1* utf8_buffer = cfs->current(); 336 assert(utf8_buffer != nullptr, "null utf8 buffer"); 337 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 338 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 339 cfs->skip_u1_fast(utf8_length); 340 341 // Before storing the symbol, make sure it's legal 342 if (_need_verify) { 343 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 344 } 345 346 unsigned int hash; 347 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 348 utf8_length, 349 hash); 350 if (result == nullptr) { 351 names[names_count] = (const char*)utf8_buffer; 352 lengths[names_count] = utf8_length; 353 indices[names_count] = index; 354 hashValues[names_count++] = hash; 355 if (names_count == SymbolTable::symbol_alloc_batch_size) { 356 SymbolTable::new_symbols(_loader_data, 357 constantPoolHandle(THREAD, cp), 358 names_count, 359 names, 360 lengths, 361 indices, 362 hashValues); 363 names_count = 0; 364 } 365 } else { 366 cp->symbol_at_put(index, result); 367 } 368 break; 369 } 370 case JVM_CONSTANT_Module: 371 case JVM_CONSTANT_Package: { 372 // Record that an error occurred in these two cases but keep parsing so 373 // that ACC_Module can be checked for in the access_flags. Need to 374 // throw NoClassDefFoundError in that case. 375 if (_major_version >= JAVA_9_VERSION) { 376 cfs->guarantee_more(3, CHECK); 377 cfs->get_u2_fast(); 378 set_class_bad_constant_seen(tag); 379 break; 380 } 381 } 382 default: { 383 classfile_parse_error("Unknown constant tag %u in class file %s", 384 tag, 385 THREAD); 386 return; 387 } 388 } // end of switch(tag) 389 } // end of for 390 391 // Allocate the remaining symbols 392 if (names_count > 0) { 393 SymbolTable::new_symbols(_loader_data, 394 constantPoolHandle(THREAD, cp), 395 names_count, 396 names, 397 lengths, 398 indices, 399 hashValues); 400 } 401 402 // Copy _current pointer of local copy back to stream. 403 assert(stream->current() == old_current, "non-exclusive use of stream"); 404 stream->set_current(cfs1.current()); 405 406 } 407 408 static inline bool valid_cp_range(int index, int length) { 409 return (index > 0 && index < length); 410 } 411 412 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 413 assert(cp != nullptr, "invariant"); 414 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 415 return cp->symbol_at(index); 416 } 417 return nullptr; 418 } 419 420 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 421 ConstantPool* const cp, 422 const int length, 423 TRAPS) { 424 assert(cp != nullptr, "invariant"); 425 assert(stream != nullptr, "invariant"); 426 427 // parsing constant pool entries 428 parse_constant_pool_entries(stream, cp, length, CHECK); 429 if (class_bad_constant_seen() != 0) { 430 // a bad CP entry has been detected previously so stop parsing and just return. 431 return; 432 } 433 434 int index = 1; // declared outside of loops for portability 435 int num_klasses = 0; 436 437 // first verification pass - validate cross references 438 // and fixup class and string constants 439 for (index = 1; index < length; index++) { // Index 0 is unused 440 const jbyte tag = cp->tag_at(index).value(); 441 switch (tag) { 442 case JVM_CONSTANT_Class: { 443 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 444 break; 445 } 446 case JVM_CONSTANT_Fieldref: 447 // fall through 448 case JVM_CONSTANT_Methodref: 449 // fall through 450 case JVM_CONSTANT_InterfaceMethodref: { 451 if (!_need_verify) break; 452 const int klass_ref_index = cp->uncached_klass_ref_index_at(index); 453 const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index); 454 guarantee_property(valid_klass_reference_at(klass_ref_index), 455 "Invalid constant pool index %u in class file %s", 456 klass_ref_index, CHECK); 457 guarantee_property(valid_cp_range(name_and_type_ref_index, length) && 458 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 459 "Invalid constant pool index %u in class file %s", 460 name_and_type_ref_index, CHECK); 461 break; 462 } 463 case JVM_CONSTANT_String: { 464 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 465 break; 466 } 467 case JVM_CONSTANT_Integer: 468 break; 469 case JVM_CONSTANT_Float: 470 break; 471 case JVM_CONSTANT_Long: 472 case JVM_CONSTANT_Double: { 473 index++; 474 guarantee_property( 475 (index < length && cp->tag_at(index).is_invalid()), 476 "Improper constant pool long/double index %u in class file %s", 477 index, CHECK); 478 break; 479 } 480 case JVM_CONSTANT_NameAndType: { 481 if (!_need_verify) break; 482 const int name_ref_index = cp->name_ref_index_at(index); 483 const int signature_ref_index = cp->signature_ref_index_at(index); 484 guarantee_property(valid_symbol_at(name_ref_index), 485 "Invalid constant pool index %u in class file %s", 486 name_ref_index, CHECK); 487 guarantee_property(valid_symbol_at(signature_ref_index), 488 "Invalid constant pool index %u in class file %s", 489 signature_ref_index, CHECK); 490 break; 491 } 492 case JVM_CONSTANT_Utf8: 493 break; 494 case JVM_CONSTANT_UnresolvedClass: // fall-through 495 case JVM_CONSTANT_UnresolvedClassInError: { 496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 497 break; 498 } 499 case JVM_CONSTANT_ClassIndex: { 500 const int class_index = cp->klass_index_at(index); 501 guarantee_property(valid_symbol_at(class_index), 502 "Invalid constant pool index %u in class file %s", 503 class_index, CHECK); 504 505 Symbol* const name = cp->symbol_at(class_index); 506 const unsigned int name_len = name->utf8_length(); 507 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 508 break; 509 } 510 case JVM_CONSTANT_StringIndex: { 511 const int string_index = cp->string_index_at(index); 512 guarantee_property(valid_symbol_at(string_index), 513 "Invalid constant pool index %u in class file %s", 514 string_index, CHECK); 515 Symbol* const sym = cp->symbol_at(string_index); 516 cp->unresolved_string_at_put(index, sym); 517 break; 518 } 519 case JVM_CONSTANT_MethodHandle: { 520 const int ref_index = cp->method_handle_index_at(index); 521 guarantee_property(valid_cp_range(ref_index, length), 522 "Invalid constant pool index %u in class file %s", 523 ref_index, CHECK); 524 const constantTag tag = cp->tag_at(ref_index); 525 const int ref_kind = cp->method_handle_ref_kind_at(index); 526 527 switch (ref_kind) { 528 case JVM_REF_getField: 529 case JVM_REF_getStatic: 530 case JVM_REF_putField: 531 case JVM_REF_putStatic: { 532 guarantee_property( 533 tag.is_field(), 534 "Invalid constant pool index %u in class file %s (not a field)", 535 ref_index, CHECK); 536 break; 537 } 538 case JVM_REF_invokeVirtual: 539 case JVM_REF_newInvokeSpecial: { 540 guarantee_property( 541 tag.is_method(), 542 "Invalid constant pool index %u in class file %s (not a method)", 543 ref_index, CHECK); 544 break; 545 } 546 case JVM_REF_invokeStatic: 547 case JVM_REF_invokeSpecial: { 548 guarantee_property( 549 tag.is_method() || 550 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 551 "Invalid constant pool index %u in class file %s (not a method)", 552 ref_index, CHECK); 553 break; 554 } 555 case JVM_REF_invokeInterface: { 556 guarantee_property( 557 tag.is_interface_method(), 558 "Invalid constant pool index %u in class file %s (not an interface method)", 559 ref_index, CHECK); 560 break; 561 } 562 default: { 563 classfile_parse_error( 564 "Bad method handle kind at constant pool index %u in class file %s", 565 index, THREAD); 566 return; 567 } 568 } // switch(refkind) 569 // Keep the ref_index unchanged. It will be indirected at link-time. 570 break; 571 } // case MethodHandle 572 case JVM_CONSTANT_MethodType: { 573 const int ref_index = cp->method_type_index_at(index); 574 guarantee_property(valid_symbol_at(ref_index), 575 "Invalid constant pool index %u in class file %s", 576 ref_index, CHECK); 577 break; 578 } 579 case JVM_CONSTANT_Dynamic: { 580 const int name_and_type_ref_index = 581 cp->bootstrap_name_and_type_ref_index_at(index); 582 583 guarantee_property(valid_cp_range(name_and_type_ref_index, length) && 584 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 585 "Invalid constant pool index %u in class file %s", 586 name_and_type_ref_index, CHECK); 587 // bootstrap specifier index must be checked later, 588 // when BootstrapMethods attr is available 589 590 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 591 cp->set_has_dynamic_constant(); 592 break; 593 } 594 case JVM_CONSTANT_InvokeDynamic: { 595 const int name_and_type_ref_index = 596 cp->bootstrap_name_and_type_ref_index_at(index); 597 598 guarantee_property(valid_cp_range(name_and_type_ref_index, length) && 599 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 600 "Invalid constant pool index %u in class file %s", 601 name_and_type_ref_index, CHECK); 602 // bootstrap specifier index must be checked later, 603 // when BootstrapMethods attr is available 604 break; 605 } 606 default: { 607 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 608 ShouldNotReachHere(); 609 break; 610 } 611 } // switch(tag) 612 } // end of for 613 614 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK); 615 616 if (!_need_verify) { 617 return; 618 } 619 620 // second verification pass - checks the strings are of the right format. 621 // but not yet to the other entries 622 for (index = 1; index < length; index++) { 623 const jbyte tag = cp->tag_at(index).value(); 624 switch (tag) { 625 case JVM_CONSTANT_UnresolvedClass: { 626 const Symbol* const class_name = cp->klass_name_at(index); 627 // check the name 628 verify_legal_class_name(class_name, CHECK); 629 break; 630 } 631 case JVM_CONSTANT_NameAndType: { 632 if (_need_verify) { 633 const int sig_index = cp->signature_ref_index_at(index); 634 const int name_index = cp->name_ref_index_at(index); 635 const Symbol* const name = cp->symbol_at(name_index); 636 const Symbol* const sig = cp->symbol_at(sig_index); 637 guarantee_property(sig->utf8_length() != 0, 638 "Illegal zero length constant pool entry at %d in class %s", 639 sig_index, CHECK); 640 guarantee_property(name->utf8_length() != 0, 641 "Illegal zero length constant pool entry at %d in class %s", 642 name_index, CHECK); 643 644 if (Signature::is_method(sig)) { 645 // Format check method name and signature 646 verify_legal_method_name(name, CHECK); 647 verify_legal_method_signature(name, sig, CHECK); 648 } else { 649 // Format check field name and signature 650 verify_legal_field_name(name, CHECK); 651 verify_legal_field_signature(name, sig, CHECK); 652 } 653 } 654 break; 655 } 656 case JVM_CONSTANT_Dynamic: { 657 const int name_and_type_ref_index = 658 cp->uncached_name_and_type_ref_index_at(index); 659 // already verified to be utf8 660 const int name_ref_index = 661 cp->name_ref_index_at(name_and_type_ref_index); 662 // already verified to be utf8 663 const int signature_ref_index = 664 cp->signature_ref_index_at(name_and_type_ref_index); 665 const Symbol* const name = cp->symbol_at(name_ref_index); 666 const Symbol* const signature = cp->symbol_at(signature_ref_index); 667 if (_need_verify) { 668 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 669 // Need only to be sure signature is the right type. 670 if (Signature::is_method(signature)) { 671 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 672 } 673 } 674 break; 675 } 676 case JVM_CONSTANT_InvokeDynamic: 677 case JVM_CONSTANT_Fieldref: 678 case JVM_CONSTANT_Methodref: 679 case JVM_CONSTANT_InterfaceMethodref: { 680 const int name_and_type_ref_index = 681 cp->uncached_name_and_type_ref_index_at(index); 682 // already verified to be utf8 683 const int name_ref_index = 684 cp->name_ref_index_at(name_and_type_ref_index); 685 // already verified to be utf8 686 const int signature_ref_index = 687 cp->signature_ref_index_at(name_and_type_ref_index); 688 const Symbol* const name = cp->symbol_at(name_ref_index); 689 const Symbol* const signature = cp->symbol_at(signature_ref_index); 690 if (tag == JVM_CONSTANT_Fieldref) { 691 if (_need_verify) { 692 // Field name and signature are verified above, when iterating NameAndType_info. 693 // Need only to be sure signature is non-zero length and the right type. 694 if (Signature::is_method(signature)) { 695 throwIllegalSignature("Field", name, signature, CHECK); 696 } 697 } 698 } else { 699 if (_need_verify) { 700 // Method name and signature are individually verified above, when iterating 701 // NameAndType_info. Need to check here that signature is non-zero length and 702 // the right type. 703 if (!Signature::is_method(signature)) { 704 throwIllegalSignature("Method", name, signature, CHECK); 705 } 706 } 707 // If a class method name begins with '<', it must be "<init>" and have void signature. 708 const unsigned int name_len = name->utf8_length(); 709 if (tag == JVM_CONSTANT_Methodref && name_len != 0 && 710 name->char_at(0) == JVM_SIGNATURE_SPECIAL) { 711 if (name != vmSymbols::object_initializer_name()) { 712 classfile_parse_error( 713 "Bad method name at constant pool index %u in class file %s", 714 name_ref_index, THREAD); 715 return; 716 } else if (!Signature::is_void_method(signature)) { // must have void signature. 717 throwIllegalSignature("Method", name, signature, CHECK); 718 } 719 } 720 } 721 break; 722 } 723 case JVM_CONSTANT_MethodHandle: { 724 const int ref_index = cp->method_handle_index_at(index); 725 const int ref_kind = cp->method_handle_ref_kind_at(index); 726 switch (ref_kind) { 727 case JVM_REF_invokeVirtual: 728 case JVM_REF_invokeStatic: 729 case JVM_REF_invokeSpecial: 730 case JVM_REF_newInvokeSpecial: { 731 const int name_and_type_ref_index = 732 cp->uncached_name_and_type_ref_index_at(ref_index); 733 const int name_ref_index = 734 cp->name_ref_index_at(name_and_type_ref_index); 735 const Symbol* const name = cp->symbol_at(name_ref_index); 736 737 if (name != vmSymbols::object_initializer_name()) { // !<init> 738 if (ref_kind == JVM_REF_newInvokeSpecial) { 739 classfile_parse_error( 740 "Bad constructor name at constant pool index %u in class file %s", 741 name_ref_index, THREAD); 742 return; 743 } 744 } else { // <init> 745 // The allowed invocation mode of <init> depends on its signature. 746 // This test corresponds to verify_invoke_instructions in the verifier. 747 const int signature_ref_index = 748 cp->signature_ref_index_at(name_and_type_ref_index); 749 const Symbol* const signature = cp->symbol_at(signature_ref_index); 750 if (signature->is_void_method_signature() 751 && ref_kind == JVM_REF_newInvokeSpecial) { 752 // OK, could be a constructor call 753 } else { 754 classfile_parse_error( 755 "Bad method name at constant pool index %u in class file %s", 756 name_ref_index, THREAD); 757 return; 758 } 759 } 760 break; 761 } 762 // Other ref_kinds are already fully checked in previous pass. 763 } // switch(ref_kind) 764 break; 765 } 766 case JVM_CONSTANT_MethodType: { 767 const Symbol* const no_name = vmSymbols::type_name(); // place holder 768 const Symbol* const signature = cp->method_type_signature_at(index); 769 verify_legal_method_signature(no_name, signature, CHECK); 770 break; 771 } 772 case JVM_CONSTANT_Utf8: { 773 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 774 } 775 } // switch(tag) 776 } // end of for 777 } 778 779 class NameSigHash: public ResourceObj { 780 public: 781 const Symbol* _name; // name 782 const Symbol* _sig; // signature 783 784 static const int HASH_ROW_SIZE = 256; 785 786 NameSigHash(Symbol* name, Symbol* sig) : 787 _name(name), 788 _sig(sig) {} 789 790 static unsigned int hash(NameSigHash const& namesig) { 791 return namesig._name->identity_hash() ^ namesig._sig->identity_hash(); 792 } 793 794 static bool equals(NameSigHash const& e0, NameSigHash const& e1) { 795 return (e0._name == e1._name) && 796 (e0._sig == e1._sig); 797 } 798 }; 799 800 using NameSigHashtable = HashTable<NameSigHash, int, 801 NameSigHash::HASH_ROW_SIZE, 802 AnyObj::RESOURCE_AREA, mtInternal, 803 &NameSigHash::hash, &NameSigHash::equals>; 804 805 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) { 806 assert(super_type != nullptr,"Method doesn't support null super type"); 807 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class() 808 && super_type->name() != vmSymbols::java_lang_Object()) { 809 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 810 err_msg("Value type %s has an identity type as supertype", 811 current->class_name()->as_klass_external_name())); 812 } 813 } 814 815 void ClassFileParser::parse_interfaces(const ClassFileStream* stream, 816 int itfs_len, 817 ConstantPool* cp, 818 bool* const has_nonstatic_concrete_methods, 819 // FIXME: lots of these functions 820 // declare their parameters as const, 821 // which adds only noise to the code. 822 // Remove the spurious const modifiers. 823 // Many are of the form "const int x" 824 // or "T* const x". 825 TRAPS) { 826 assert(stream != nullptr, "invariant"); 827 assert(cp != nullptr, "invariant"); 828 assert(has_nonstatic_concrete_methods != nullptr, "invariant"); 829 830 if (itfs_len == 0) { 831 _local_interfaces = Universe::the_empty_instance_klass_array(); 832 833 } else { 834 assert(itfs_len > 0, "only called for len>0"); 835 _local_interface_indexes = new GrowableArray<u2>(itfs_len); 836 int index = 0; 837 for (index = 0; index < itfs_len; index++) { 838 const u2 interface_index = stream->get_u2(CHECK); 839 guarantee_property( 840 valid_klass_reference_at(interface_index), 841 "Interface name has bad constant pool index %u in class file %s", 842 interface_index, CHECK); 843 _local_interface_indexes->at_put_grow(index, interface_index); 844 } 845 846 if (!_need_verify || itfs_len <= 1) { 847 return; 848 } 849 850 // Check if there's any duplicates in interfaces 851 ResourceMark rm(THREAD); 852 // Set containing interface names 853 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>(); 854 for (index = 0; index < itfs_len; index++) { 855 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index)); 856 // If no duplicates, add (name, nullptr) in hashtable interface_names. 857 if (!interface_names->put(interface_name, 0)) { 858 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 859 interface_name->as_C_string(), THREAD); 860 return; 861 } 862 } 863 } 864 } 865 866 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 867 int constantvalue_index, 868 int signature_index, 869 TRAPS) const { 870 // Make sure the constant pool entry is of a type appropriate to this field 871 guarantee_property( 872 (constantvalue_index > 0 && 873 constantvalue_index < cp->length()), 874 "Bad initial value index %u in ConstantValue attribute in class file %s", 875 constantvalue_index, CHECK); 876 877 const constantTag value_type = cp->tag_at(constantvalue_index); 878 switch(cp->basic_type_for_signature_at(signature_index)) { 879 case T_LONG: { 880 guarantee_property(value_type.is_long(), 881 "Inconsistent constant value type in class file %s", 882 CHECK); 883 break; 884 } 885 case T_FLOAT: { 886 guarantee_property(value_type.is_float(), 887 "Inconsistent constant value type in class file %s", 888 CHECK); 889 break; 890 } 891 case T_DOUBLE: { 892 guarantee_property(value_type.is_double(), 893 "Inconsistent constant value type in class file %s", 894 CHECK); 895 break; 896 } 897 case T_BYTE: 898 case T_CHAR: 899 case T_SHORT: 900 case T_BOOLEAN: 901 case T_INT: { 902 guarantee_property(value_type.is_int(), 903 "Inconsistent constant value type in class file %s", 904 CHECK); 905 break; 906 } 907 case T_OBJECT: { 908 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 909 && value_type.is_string()), 910 "Bad string initial value in class file %s", 911 CHECK); 912 break; 913 } 914 default: { 915 classfile_parse_error("Unable to set initial value %u in class file %s", 916 constantvalue_index, 917 THREAD); 918 } 919 } 920 } 921 922 class AnnotationCollector : public ResourceObj{ 923 public: 924 enum Location { _in_field, _in_method, _in_class }; 925 enum ID { 926 _unknown = 0, 927 _method_CallerSensitive, 928 _method_ForceInline, 929 _method_DontInline, 930 _method_ChangesCurrentThread, 931 _method_JvmtiHideEvents, 932 _method_JvmtiMountTransition, 933 _method_InjectedProfile, 934 _method_LambdaForm_Compiled, 935 _method_Hidden, 936 _method_Scoped, 937 _method_IntrinsicCandidate, 938 _jdk_internal_vm_annotation_Contended, 939 _field_Stable, 940 _jdk_internal_vm_annotation_ReservedStackAccess, 941 _jdk_internal_ValueBased, 942 _jdk_internal_LooselyConsistentValue, 943 _jdk_internal_NullRestricted, 944 _java_lang_Deprecated, 945 _java_lang_Deprecated_for_removal, 946 _jdk_internal_vm_annotation_AOTSafeClassInitializer, 947 _method_AOTRuntimeSetup, 948 _jdk_internal_vm_annotation_TrustFinalFields, 949 _annotation_LIMIT 950 }; 951 const Location _location; 952 int _annotations_present; 953 u2 _contended_group; 954 955 AnnotationCollector(Location location) 956 : _location(location), _annotations_present(0), _contended_group(0) 957 { 958 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 959 } 960 // If this annotation name has an ID, report it (or _none). 961 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations); 962 // Set the annotation name: 963 void set_annotation(ID id) { 964 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 965 _annotations_present |= (int)nth_bit((int)id); 966 } 967 968 void remove_annotation(ID id) { 969 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 970 _annotations_present &= (int)~nth_bit((int)id); 971 } 972 973 // Report if the annotation is present. 974 bool has_any_annotations() const { return _annotations_present != 0; } 975 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 976 977 void set_contended_group(u2 group) { _contended_group = group; } 978 u2 contended_group() const { return _contended_group; } 979 980 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 981 982 void set_stable(bool stable) { set_annotation(_field_Stable); } 983 bool is_stable() const { return has_annotation(_field_Stable); } 984 985 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); } 986 }; 987 988 // This class also doubles as a holder for metadata cleanup. 989 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 990 private: 991 ClassLoaderData* _loader_data; 992 AnnotationArray* _field_annotations; 993 AnnotationArray* _field_type_annotations; 994 public: 995 FieldAnnotationCollector(ClassLoaderData* loader_data) : 996 AnnotationCollector(_in_field), 997 _loader_data(loader_data), 998 _field_annotations(nullptr), 999 _field_type_annotations(nullptr) {} 1000 ~FieldAnnotationCollector(); 1001 void apply_to(FieldInfo* f); 1002 AnnotationArray* field_annotations() { return _field_annotations; } 1003 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1004 1005 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1006 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1007 }; 1008 1009 class MethodAnnotationCollector : public AnnotationCollector{ 1010 public: 1011 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1012 void apply_to(const methodHandle& m); 1013 }; 1014 1015 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1016 public: 1017 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1018 void apply_to(InstanceKlass* ik); 1019 }; 1020 1021 1022 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth); // fwd decl 1023 static const int max_recursion_depth = 5; 1024 1025 // Safely increment index by val if does not pass limit 1026 #define SAFE_ADD(index, limit, val) \ 1027 if (index >= limit - val) return limit; \ 1028 index += val; 1029 1030 // Skip an annotation. Return >=limit if there is any problem. 1031 static int skip_annotation(const u1* buffer, int limit, int index, int recursion_depth = 0) { 1032 assert(buffer != nullptr, "invariant"); 1033 if (recursion_depth > max_recursion_depth) { 1034 return limit; 1035 } 1036 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1037 // value := switch (tag:u1) { ... } 1038 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1039 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1040 while (--nmem >= 0 && index < limit) { 1041 SAFE_ADD(index, limit, 2); // skip member 1042 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1); 1043 } 1044 return index; 1045 } 1046 1047 // Skip an annotation value. Return >=limit if there is any problem. 1048 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth) { 1049 assert(buffer != nullptr, "invariant"); 1050 1051 if (recursion_depth > max_recursion_depth) { 1052 return limit; 1053 } 1054 // value := switch (tag:u1) { 1055 // case B, C, I, S, Z, D, F, J, c: con:u2; 1056 // case e: e_class:u2 e_name:u2; 1057 // case s: s_con:u2; 1058 // case [: do(nval:u2) {value}; 1059 // case @: annotation; 1060 // case s: s_con:u2; 1061 // } 1062 SAFE_ADD(index, limit, 1); // read tag 1063 const u1 tag = buffer[index - 1]; 1064 switch (tag) { 1065 case 'B': 1066 case 'C': 1067 case 'I': 1068 case 'S': 1069 case 'Z': 1070 case 'D': 1071 case 'F': 1072 case 'J': 1073 case 'c': 1074 case 's': 1075 SAFE_ADD(index, limit, 2); // skip con or s_con 1076 break; 1077 case 'e': 1078 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1079 break; 1080 case '[': 1081 { 1082 SAFE_ADD(index, limit, 2); // read nval 1083 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1084 while (--nval >= 0 && index < limit) { 1085 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1); 1086 } 1087 } 1088 break; 1089 case '@': 1090 index = skip_annotation(buffer, limit, index, recursion_depth + 1); 1091 break; 1092 default: 1093 return limit; // bad tag byte 1094 } 1095 return index; 1096 } 1097 1098 // Sift through annotations, looking for those significant to the VM: 1099 static void parse_annotations(const ConstantPool* const cp, 1100 const u1* buffer, int limit, 1101 AnnotationCollector* coll, 1102 ClassLoaderData* loader_data, 1103 const bool can_access_vm_annotations) { 1104 1105 assert(cp != nullptr, "invariant"); 1106 assert(buffer != nullptr, "invariant"); 1107 assert(coll != nullptr, "invariant"); 1108 assert(loader_data != nullptr, "invariant"); 1109 1110 // annotations := do(nann:u2) {annotation} 1111 int index = 2; // read nann 1112 if (index >= limit) return; 1113 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1114 enum { // initial annotation layout 1115 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1116 count_off = 2, // u2 such as 1 (one value) 1117 member_off = 4, // utf8 such as 'value' 1118 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1119 e_tag_val = 'e', 1120 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1121 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1122 e_size = 11, // end of 'e' annotation 1123 c_tag_val = 'c', // payload is type 1124 c_con_off = 7, // utf8 payload, such as 'I' 1125 c_size = 9, // end of 'c' annotation 1126 s_tag_val = 's', // payload is String 1127 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1128 s_size = 9, 1129 b_tag_val = 'Z', // payload is boolean 1130 min_size = 6 // smallest possible size (zero members) 1131 }; 1132 // Cannot add min_size to index in case of overflow MAX_INT 1133 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1134 int index0 = index; 1135 index = skip_annotation(buffer, limit, index); 1136 const u1* const abase = buffer + index0; 1137 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1138 const int count = Bytes::get_Java_u2((address)abase + count_off); 1139 const Symbol* const aname = check_symbol_at(cp, atype); 1140 if (aname == nullptr) break; // invalid annotation name 1141 const Symbol* member = nullptr; 1142 if (count >= 1) { 1143 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1144 member = check_symbol_at(cp, member_index); 1145 if (member == nullptr) break; // invalid member name 1146 } 1147 1148 // Here is where parsing particular annotations will take place. 1149 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations); 1150 if (AnnotationCollector::_unknown == id) continue; 1151 coll->set_annotation(id); 1152 if (AnnotationCollector::_java_lang_Deprecated == id) { 1153 // @Deprecated can specify forRemoval=true, which we need 1154 // to record for JFR to use. If the annotation is not well-formed 1155 // then we may not be able to determine that. 1156 const u1* offset = abase + member_off; 1157 // There are only 2 members in @Deprecated. 1158 int n_members = MIN2(count, 2); 1159 for (int i = 0; i < n_members; ++i) { 1160 int member_index = Bytes::get_Java_u2((address)offset); 1161 offset += 2; 1162 member = check_symbol_at(cp, member_index); 1163 if (member == vmSymbols::since() && 1164 (*((address)offset) == s_tag_val)) { 1165 // Found `since` first so skip over it 1166 offset += 3; 1167 } 1168 else if (member == vmSymbols::for_removal() && 1169 (*((address)offset) == b_tag_val)) { 1170 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1); 1171 // No guarantee the entry is valid so check it refers to an int in the CP. 1172 if (cp->is_within_bounds(boolean_value_index) && 1173 cp->tag_at(boolean_value_index).is_int() && 1174 cp->int_at(boolean_value_index) == 1) { 1175 // forRemoval == true 1176 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal); 1177 } 1178 break; // no need to check further 1179 } 1180 else { 1181 // This @Deprecated annotation is malformed so we don't try to 1182 // determine whether forRemoval is set. 1183 break; 1184 } 1185 } 1186 continue; // proceed to next annotation 1187 } 1188 1189 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1190 // @Contended can optionally specify the contention group. 1191 // 1192 // Contended group defines the equivalence class over the fields: 1193 // the fields within the same contended group are not treated distinct. 1194 // The only exception is default group, which does not incur the 1195 // equivalence. Naturally, contention group for classes is meaningless. 1196 // 1197 // While the contention group is specified as String, annotation 1198 // values are already interned, and we might as well use the constant 1199 // pool index as the group tag. 1200 // 1201 u2 group_index = 0; // default contended group 1202 if (count == 1 1203 && s_size == (index - index0) // match size 1204 && s_tag_val == *(abase + tag_off) 1205 && member == vmSymbols::value_name()) { 1206 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1207 // No guarantee the group_index is valid so check it refers to a 1208 // symbol in the CP. 1209 if (cp->is_within_bounds(group_index) && 1210 cp->tag_at(group_index).is_utf8()) { 1211 // Seems valid, so check for empty string and reset 1212 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1213 group_index = 0; // default contended group 1214 } 1215 } else { 1216 // Not valid so use the default 1217 group_index = 0; 1218 } 1219 } 1220 coll->set_contended_group(group_index); 1221 continue; // proceed to next annotation 1222 } 1223 } 1224 } 1225 1226 1227 // Parse attributes for a field. 1228 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1229 u2 attributes_count, 1230 bool is_static, u2 signature_index, 1231 u2* const constantvalue_index_addr, 1232 bool* const is_synthetic_addr, 1233 u2* const generic_signature_index_addr, 1234 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1235 TRAPS) { 1236 assert(cfs != nullptr, "invariant"); 1237 assert(constantvalue_index_addr != nullptr, "invariant"); 1238 assert(is_synthetic_addr != nullptr, "invariant"); 1239 assert(generic_signature_index_addr != nullptr, "invariant"); 1240 assert(parsed_annotations != nullptr, "invariant"); 1241 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1242 1243 u2 constantvalue_index = 0; 1244 u2 generic_signature_index = 0; 1245 bool is_synthetic = false; 1246 const u1* runtime_visible_annotations = nullptr; 1247 int runtime_visible_annotations_length = 0; 1248 const u1* runtime_visible_type_annotations = nullptr; 1249 int runtime_visible_type_annotations_length = 0; 1250 bool runtime_invisible_annotations_exists = false; 1251 bool runtime_invisible_type_annotations_exists = false; 1252 const ConstantPool* const cp = _cp; 1253 1254 while (attributes_count--) { 1255 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1256 const u2 attribute_name_index = cfs->get_u2_fast(); 1257 const u4 attribute_length = cfs->get_u4_fast(); 1258 guarantee_property(valid_symbol_at(attribute_name_index), 1259 "Invalid field attribute index %u in class file %s", 1260 attribute_name_index, 1261 CHECK); 1262 1263 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1264 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1265 // ignore if non-static 1266 if (constantvalue_index != 0) { 1267 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD); 1268 return; 1269 } 1270 guarantee_property( 1271 attribute_length == 2, 1272 "Invalid ConstantValue field attribute length %u in class file %s", 1273 attribute_length, CHECK); 1274 1275 constantvalue_index = cfs->get_u2(CHECK); 1276 if (_need_verify) { 1277 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1278 } 1279 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1280 if (attribute_length != 0) { 1281 classfile_parse_error( 1282 "Invalid Synthetic field attribute length %u in class file %s", 1283 attribute_length, THREAD); 1284 return; 1285 } 1286 is_synthetic = true; 1287 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1288 if (attribute_length != 0) { 1289 classfile_parse_error( 1290 "Invalid Deprecated field attribute length %u in class file %s", 1291 attribute_length, THREAD); 1292 return; 1293 } 1294 } else if (_major_version >= JAVA_1_5_VERSION) { 1295 if (attribute_name == vmSymbols::tag_signature()) { 1296 if (generic_signature_index != 0) { 1297 classfile_parse_error( 1298 "Multiple Signature attributes for field in class file %s", THREAD); 1299 return; 1300 } 1301 if (attribute_length != 2) { 1302 classfile_parse_error( 1303 "Wrong size %u for field's Signature attribute in class file %s", 1304 attribute_length, THREAD); 1305 return; 1306 } 1307 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1308 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1309 if (runtime_visible_annotations != nullptr) { 1310 classfile_parse_error( 1311 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD); 1312 return; 1313 } 1314 runtime_visible_annotations_length = attribute_length; 1315 runtime_visible_annotations = cfs->current(); 1316 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 1317 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1318 parse_annotations(cp, 1319 runtime_visible_annotations, 1320 runtime_visible_annotations_length, 1321 parsed_annotations, 1322 _loader_data, 1323 _can_access_vm_annotations); 1324 cfs->skip_u1_fast(runtime_visible_annotations_length); 1325 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1326 if (runtime_invisible_annotations_exists) { 1327 classfile_parse_error( 1328 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD); 1329 return; 1330 } 1331 runtime_invisible_annotations_exists = true; 1332 cfs->skip_u1(attribute_length, CHECK); 1333 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1334 if (runtime_visible_type_annotations != nullptr) { 1335 classfile_parse_error( 1336 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD); 1337 return; 1338 } 1339 runtime_visible_type_annotations_length = attribute_length; 1340 runtime_visible_type_annotations = cfs->current(); 1341 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 1342 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1343 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1344 if (runtime_invisible_type_annotations_exists) { 1345 classfile_parse_error( 1346 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD); 1347 return; 1348 } else { 1349 runtime_invisible_type_annotations_exists = true; 1350 } 1351 cfs->skip_u1(attribute_length, CHECK); 1352 } else { 1353 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1354 } 1355 } else { 1356 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1357 } 1358 } 1359 1360 *constantvalue_index_addr = constantvalue_index; 1361 *is_synthetic_addr = is_synthetic; 1362 *generic_signature_index_addr = generic_signature_index; 1363 AnnotationArray* a = allocate_annotations(runtime_visible_annotations, 1364 runtime_visible_annotations_length, 1365 CHECK); 1366 parsed_annotations->set_field_annotations(a); 1367 a = allocate_annotations(runtime_visible_type_annotations, 1368 runtime_visible_type_annotations_length, 1369 CHECK); 1370 parsed_annotations->set_field_type_annotations(a); 1371 return; 1372 } 1373 1374 1375 // Side-effects: populates the _fields, _fields_annotations, 1376 // _fields_type_annotations fields 1377 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1378 AccessFlags class_access_flags, 1379 ConstantPool* cp, 1380 const int cp_size, 1381 u2* const java_fields_count_ptr, 1382 TRAPS) { 1383 1384 assert(cfs != nullptr, "invariant"); 1385 assert(cp != nullptr, "invariant"); 1386 assert(java_fields_count_ptr != nullptr, "invariant"); 1387 1388 assert(nullptr == _fields_annotations, "invariant"); 1389 assert(nullptr == _fields_type_annotations, "invariant"); 1390 1391 // "inline type" means concrete value class 1392 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract(); 1393 // "value class" can be either abstract or concrete value class 1394 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface(); 1395 cfs->guarantee_more(2, CHECK); // length 1396 const u2 length = cfs->get_u2_fast(); 1397 *java_fields_count_ptr = length; 1398 1399 int num_injected = 0; 1400 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1401 &num_injected); 1402 1403 // Two more slots are required for inline classes: 1404 // - The static field ".null_reset" which carries the nullable flat layout 1405 // representation of null, added below 1406 // - The nonstatic field ".empty" the JVM injects when detecting an empty 1407 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout 1408 // One more slot is required for both abstract value class and inline classes: 1409 // - The static field ".acmp_maps" for acmp and identity hash, tracks 1410 // nonstatic fields both inherited or declared, added below 1411 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0) 1412 + (is_value_class ? 1 : 0); 1413 1414 // Allocate a temporary resource array to collect field data. 1415 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream. 1416 _temp_field_info = new GrowableArray<FieldInfo>(total_fields); 1417 1418 ResourceMark rm(THREAD); 1419 for (int n = 0; n < length; n++) { 1420 // access_flags, name_index, descriptor_index, attributes_count 1421 cfs->guarantee_more(8, CHECK); 1422 1423 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS; 1424 if (!supports_inline_types()) { 1425 recognized_modifiers &= ~JVM_ACC_STRICT_INIT; 1426 } 1427 1428 const jint flags = cfs->get_u2_fast() & recognized_modifiers; 1429 verify_legal_field_modifiers(flags, class_access_flags, CHECK); 1430 AccessFlags access_flags; 1431 access_flags.set_flags(flags); 1432 FieldInfo::FieldFlags fieldFlags(0); 1433 1434 const u2 name_index = cfs->get_u2_fast(); 1435 guarantee_property(valid_symbol_at(name_index), 1436 "Invalid constant pool index %u for field name in class file %s", 1437 name_index, CHECK); 1438 const Symbol* const name = cp->symbol_at(name_index); 1439 verify_legal_field_name(name, CHECK); 1440 1441 const u2 signature_index = cfs->get_u2_fast(); 1442 guarantee_property(valid_symbol_at(signature_index), 1443 "Invalid constant pool index %u for field signature in class file %s", 1444 signature_index, CHECK); 1445 const Symbol* const sig = cp->symbol_at(signature_index); 1446 verify_legal_field_signature(name, sig, CHECK); 1447 1448 u2 constantvalue_index = 0; 1449 bool is_synthetic = false; 1450 u2 generic_signature_index = 0; 1451 const bool is_static = access_flags.is_static(); 1452 FieldAnnotationCollector parsed_annotations(_loader_data); 1453 1454 bool is_null_restricted = false; 1455 1456 const u2 attributes_count = cfs->get_u2_fast(); 1457 if (attributes_count > 0) { 1458 parse_field_attributes(cfs, 1459 attributes_count, 1460 is_static, 1461 signature_index, 1462 &constantvalue_index, 1463 &is_synthetic, 1464 &generic_signature_index, 1465 &parsed_annotations, 1466 CHECK); 1467 1468 if (parsed_annotations.field_annotations() != nullptr) { 1469 if (_fields_annotations == nullptr) { 1470 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1471 _loader_data, length, nullptr, 1472 CHECK); 1473 } 1474 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1475 parsed_annotations.set_field_annotations(nullptr); 1476 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) { 1477 if (!Signature::has_envelope(sig)) { 1478 Exceptions::fthrow( 1479 THREAD_AND_LOCATION, 1480 vmSymbols::java_lang_ClassFormatError(), 1481 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)", 1482 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string()); 1483 return; 1484 } 1485 if (!supports_inline_types()) { 1486 Exceptions::fthrow( 1487 THREAD_AND_LOCATION, 1488 vmSymbols::java_lang_ClassFormatError(), 1489 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file", 1490 class_name()->as_C_string(), name->as_C_string()); 1491 return; 1492 } 1493 1494 if ((flags & JVM_ACC_STRICT_INIT) == 0) { 1495 // Inject STRICT_INIT and validate in context 1496 const jint patched_flags = flags | JVM_ACC_STRICT_INIT; 1497 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK); 1498 access_flags.set_flags(patched_flags); 1499 } 1500 is_null_restricted = true; 1501 } 1502 parsed_annotations.set_field_annotations(nullptr); 1503 } 1504 if (parsed_annotations.field_type_annotations() != nullptr) { 1505 if (_fields_type_annotations == nullptr) { 1506 _fields_type_annotations = 1507 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1508 length, 1509 nullptr, 1510 CHECK); 1511 } 1512 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1513 parsed_annotations.set_field_type_annotations(nullptr); 1514 } 1515 1516 if (is_synthetic) { 1517 access_flags.set_is_synthetic(); 1518 } 1519 if (generic_signature_index != 0) { 1520 fieldFlags.update_generic(true); 1521 } 1522 } 1523 1524 if (is_null_restricted) { 1525 fieldFlags.update_null_free_inline_type(true); 1526 } 1527 1528 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1529 1530 // Update number of static oop fields. 1531 if (is_static && is_reference_type(type)) { 1532 _static_oop_count++; 1533 } 1534 1535 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags); 1536 fi.set_index(n); 1537 if (fieldFlags.is_generic()) { 1538 fi.set_generic_signature_index(generic_signature_index); 1539 } 1540 parsed_annotations.apply_to(&fi); 1541 if (fi.field_flags().is_contended()) { 1542 _has_contended_fields = true; 1543 } 1544 if (access_flags.is_strict() && access_flags.is_static()) { 1545 _has_strict_static_fields = true; 1546 } 1547 _temp_field_info->append(fi); 1548 } 1549 assert(_temp_field_info->length() == length, "Must be"); 1550 1551 if (num_injected != 0) { 1552 for (int n = 0; n < num_injected; n++) { 1553 // Check for duplicates 1554 if (injected[n].may_be_java) { 1555 const Symbol* const name = injected[n].name(); 1556 const Symbol* const signature = injected[n].signature(); 1557 bool duplicate = false; 1558 for (int i = 0; i < length; i++) { 1559 const FieldInfo* const f = _temp_field_info->adr_at(i); 1560 if (name == cp->symbol_at(f->name_index()) && 1561 signature == cp->symbol_at(f->signature_index())) { 1562 // Symbol is desclared in Java so skip this one 1563 duplicate = true; 1564 break; 1565 } 1566 } 1567 if (duplicate) { 1568 // These will be removed from the field array at the end 1569 continue; 1570 } 1571 } 1572 1573 // Injected field 1574 FieldInfo::FieldFlags fflags(0); 1575 fflags.update_injected(true); 1576 AccessFlags aflags; 1577 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags); 1578 int idx = _temp_field_info->append(fi); 1579 _temp_field_info->adr_at(idx)->set_index(idx); 1580 } 1581 } 1582 1583 if (is_inline_type) { 1584 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero. 1585 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field 1586 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects 1587 // alive. 1588 FieldInfo::FieldFlags fflags2(0); 1589 fflags2.update_injected(true); 1590 AccessFlags aflags2(JVM_ACC_STATIC); 1591 FieldInfo fi2(aflags2, 1592 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)), 1593 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)), 1594 0, 1595 fflags2); 1596 int idx2 = _temp_field_info->append(fi2); 1597 _temp_field_info->adr_at(idx2)->set_index(idx2); 1598 _static_oop_count++; 1599 } 1600 if (!access_flags().is_identity_class() && !access_flags().is_interface() 1601 && _class_name != vmSymbols::java_lang_Object()) { 1602 // Acmp map ".acmp_maps" required for abstract and concrete value classes 1603 FieldInfo::FieldFlags fflags2(0); 1604 fflags2.update_injected(true); 1605 fflags2.update_stable(true); 1606 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL); 1607 FieldInfo fi3(aflags2, 1608 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)), 1609 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)), 1610 0, 1611 fflags2); 1612 int idx2 = _temp_field_info->append(fi3); 1613 _temp_field_info->adr_at(idx2)->set_index(idx2); 1614 _static_oop_count++; 1615 } 1616 1617 if (_need_verify && length > 1) { 1618 // Check duplicated fields 1619 ResourceMark rm(THREAD); 1620 // Set containing name-signature pairs 1621 NameSigHashtable* names_and_sigs = new NameSigHashtable(); 1622 for (int i = 0; i < _temp_field_info->length(); i++) { 1623 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp), 1624 _temp_field_info->adr_at(i)->signature(_cp)); 1625 // If no duplicates, add name/signature in hashtable names_and_sigs. 1626 if(!names_and_sigs->put(name_and_sig, 0)) { 1627 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1628 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); 1629 return; 1630 } 1631 } 1632 } 1633 } 1634 1635 1636 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1637 u4 code_length, 1638 u4 exception_table_length, 1639 TRAPS) { 1640 assert(cfs != nullptr, "invariant"); 1641 1642 const unsafe_u2* const exception_table_start = cfs->current(); 1643 assert(exception_table_start != nullptr, "null exception table"); 1644 1645 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1646 // end_pc, 1647 // handler_pc, 1648 // catch_type_index 1649 1650 // Will check legal target after parsing code array in verifier. 1651 if (_need_verify) { 1652 for (unsigned int i = 0; i < exception_table_length; i++) { 1653 const u2 start_pc = cfs->get_u2_fast(); 1654 const u2 end_pc = cfs->get_u2_fast(); 1655 const u2 handler_pc = cfs->get_u2_fast(); 1656 const u2 catch_type_index = cfs->get_u2_fast(); 1657 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1658 "Illegal exception table range in class file %s", 1659 CHECK_NULL); 1660 guarantee_property(handler_pc < code_length, 1661 "Illegal exception table handler in class file %s", 1662 CHECK_NULL); 1663 if (catch_type_index != 0) { 1664 guarantee_property(valid_klass_reference_at(catch_type_index), 1665 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1666 } 1667 } 1668 } else { 1669 cfs->skip_u2_fast(exception_table_length * 4); 1670 } 1671 return exception_table_start; 1672 } 1673 1674 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1675 u4 code_length, 1676 CompressedLineNumberWriteStream**const write_stream, 1677 TRAPS) { 1678 1679 const ClassFileStream* const cfs = _stream; 1680 unsigned int num_entries = cfs->get_u2(CHECK); 1681 1682 // Each entry is a u2 start_pc, and a u2 line_number 1683 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1684 1685 // Verify line number attribute and table length 1686 guarantee_property( 1687 code_attribute_length == sizeof(u2) + length_in_bytes, 1688 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1689 1690 cfs->guarantee_more(length_in_bytes, CHECK); 1691 1692 if ((*write_stream) == nullptr) { 1693 if (length_in_bytes > fixed_buffer_size) { 1694 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1695 } else { 1696 (*write_stream) = new CompressedLineNumberWriteStream( 1697 _linenumbertable_buffer, fixed_buffer_size); 1698 } 1699 } 1700 1701 while (num_entries-- > 0) { 1702 const u2 bci = cfs->get_u2_fast(); // start_pc 1703 const u2 line = cfs->get_u2_fast(); // line_number 1704 guarantee_property(bci < code_length, 1705 "Invalid pc in LineNumberTable in class file %s", CHECK); 1706 (*write_stream)->write_pair(bci, line); 1707 } 1708 } 1709 1710 1711 class LVT_Hash : public AllStatic { 1712 public: 1713 1714 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1715 /* 1716 * 3-tuple start_bci/length/slot has to be unique key, 1717 * so the following comparison seems to be redundant: 1718 * && elem->name_cp_index == entry->_elem->name_cp_index 1719 */ 1720 return (e0.start_bci == e1.start_bci && 1721 e0.length == e1.length && 1722 e0.name_cp_index == e1.name_cp_index && 1723 e0.slot == e1.slot); 1724 } 1725 1726 static unsigned int hash(LocalVariableTableElement const& e0) { 1727 unsigned int raw_hash = e0.start_bci; 1728 1729 raw_hash = e0.length + raw_hash * 37; 1730 raw_hash = e0.name_cp_index + raw_hash * 37; 1731 raw_hash = e0.slot + raw_hash * 37; 1732 1733 return raw_hash; 1734 } 1735 }; 1736 1737 1738 // Class file LocalVariableTable elements. 1739 class Classfile_LVT_Element { 1740 public: 1741 u2 start_bci; 1742 u2 length; 1743 u2 name_cp_index; 1744 u2 descriptor_cp_index; 1745 u2 slot; 1746 }; 1747 1748 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1749 LocalVariableTableElement* const lvt) { 1750 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1751 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1752 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1753 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1754 lvt->signature_cp_index = 0; 1755 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1756 } 1757 1758 // Function is used to parse both attributes: 1759 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1760 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1761 u4 code_length, 1762 u2 max_locals, 1763 u4 code_attribute_length, 1764 u2* const localvariable_table_length, 1765 bool isLVTT, 1766 TRAPS) { 1767 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1768 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1769 const unsigned int size = checked_cast<unsigned>( 1770 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2)); 1771 1772 const ConstantPool* const cp = _cp; 1773 1774 // Verify local variable table attribute has right length 1775 if (_need_verify) { 1776 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1777 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1778 } 1779 1780 const unsafe_u2* const localvariable_table_start = cfs->current(); 1781 assert(localvariable_table_start != nullptr, "null local variable table"); 1782 if (!_need_verify) { 1783 cfs->skip_u2_fast(size); 1784 } else { 1785 cfs->guarantee_more(size * 2, CHECK_NULL); 1786 for(int i = 0; i < (*localvariable_table_length); i++) { 1787 const u2 start_pc = cfs->get_u2_fast(); 1788 const u2 length = cfs->get_u2_fast(); 1789 const u2 name_index = cfs->get_u2_fast(); 1790 const u2 descriptor_index = cfs->get_u2_fast(); 1791 const u2 index = cfs->get_u2_fast(); 1792 // Assign to a u4 to avoid overflow 1793 const u4 end_pc = (u4)start_pc + (u4)length; 1794 1795 if (start_pc >= code_length) { 1796 classfile_parse_error( 1797 "Invalid start_pc %u in %s in class file %s", 1798 start_pc, tbl_name, THREAD); 1799 return nullptr; 1800 } 1801 if (end_pc > code_length) { 1802 classfile_parse_error( 1803 "Invalid length %u in %s in class file %s", 1804 length, tbl_name, THREAD); 1805 return nullptr; 1806 } 1807 const int cp_size = cp->length(); 1808 guarantee_property(valid_symbol_at(name_index), 1809 "Name index %u in %s has bad constant type in class file %s", 1810 name_index, tbl_name, CHECK_NULL); 1811 guarantee_property(valid_symbol_at(descriptor_index), 1812 "Signature index %u in %s has bad constant type in class file %s", 1813 descriptor_index, tbl_name, CHECK_NULL); 1814 1815 const Symbol* const name = cp->symbol_at(name_index); 1816 const Symbol* const sig = cp->symbol_at(descriptor_index); 1817 verify_legal_field_name(name, CHECK_NULL); 1818 u2 extra_slot = 0; 1819 if (!isLVTT) { 1820 verify_legal_field_signature(name, sig, CHECK_NULL); 1821 1822 // 4894874: check special cases for double and long local variables 1823 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1824 sig == vmSymbols::type_signature(T_LONG)) { 1825 extra_slot = 1; 1826 } 1827 } 1828 guarantee_property((index + extra_slot) < max_locals, 1829 "Invalid index %u in %s in class file %s", 1830 index, tbl_name, CHECK_NULL); 1831 } 1832 } 1833 return localvariable_table_start; 1834 } 1835 1836 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1837 u4 code_attribute_length, 1838 TRAPS) { 1839 assert(cfs != nullptr, "invariant"); 1840 1841 if (0 == code_attribute_length) { 1842 return nullptr; 1843 } 1844 1845 const u1* const stackmap_table_start = cfs->current(); 1846 assert(stackmap_table_start != nullptr, "null stackmap table"); 1847 1848 // check code_attribute_length 1849 cfs->skip_u1(code_attribute_length, CHECK_NULL); 1850 1851 return stackmap_table_start; 1852 } 1853 1854 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 1855 u2* const checked_exceptions_length, 1856 u4 method_attribute_length, 1857 TRAPS) { 1858 assert(cfs != nullptr, "invariant"); 1859 assert(checked_exceptions_length != nullptr, "invariant"); 1860 1861 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1862 *checked_exceptions_length = cfs->get_u2_fast(); 1863 const unsigned int size = 1864 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1865 const unsafe_u2* const checked_exceptions_start = cfs->current(); 1866 assert(checked_exceptions_start != nullptr, "null checked exceptions"); 1867 if (!_need_verify) { 1868 cfs->skip_u2_fast(size); 1869 } else { 1870 // Verify each value in the checked exception table 1871 u2 checked_exception; 1872 const u2 len = *checked_exceptions_length; 1873 cfs->guarantee_more(2 * len, CHECK_NULL); 1874 for (int i = 0; i < len; i++) { 1875 checked_exception = cfs->get_u2_fast(); 1876 guarantee_property( 1877 valid_klass_reference_at(checked_exception), 1878 "Exception name has bad type at constant pool %u in class file %s", 1879 checked_exception, CHECK_NULL); 1880 } 1881 } 1882 // check exceptions attribute length 1883 if (_need_verify) { 1884 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1885 sizeof(u2) * size), 1886 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1887 } 1888 return checked_exceptions_start; 1889 } 1890 1891 void ClassFileParser::throwIllegalSignature(const char* type, 1892 const Symbol* name, 1893 const Symbol* sig, 1894 TRAPS) const { 1895 assert(name != nullptr, "invariant"); 1896 assert(sig != nullptr, "invariant"); 1897 1898 ResourceMark rm(THREAD); 1899 // Names are all known to be < 64k so we know this formatted message is not excessively large. 1900 Exceptions::fthrow(THREAD_AND_LOCATION, 1901 vmSymbols::java_lang_ClassFormatError(), 1902 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1903 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1904 } 1905 1906 AnnotationCollector::ID 1907 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 1908 const Symbol* name, 1909 const bool can_access_vm_annotations) { 1910 const vmSymbolID sid = vmSymbols::find_sid(name); 1911 // Privileged code can use all annotations. Other code silently drops some. 1912 const bool privileged = loader_data->is_boot_class_loader_data() || 1913 loader_data->is_platform_class_loader_data() || 1914 can_access_vm_annotations; 1915 switch (sid) { 1916 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 1917 if (_location != _in_method) break; // only allow for methods 1918 if (!privileged) break; // only allow in privileged code 1919 return _method_CallerSensitive; 1920 } 1921 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 1922 if (_location != _in_method) break; // only allow for methods 1923 if (!privileged) break; // only allow in privileged code 1924 return _method_ForceInline; 1925 } 1926 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 1927 if (_location != _in_method) break; // only allow for methods 1928 if (!privileged) break; // only allow in privileged code 1929 return _method_DontInline; 1930 } 1931 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): { 1932 if (_location != _in_method) break; // only allow for methods 1933 if (!privileged) break; // only allow in privileged code 1934 return _method_ChangesCurrentThread; 1935 } 1936 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): { 1937 if (_location != _in_method) break; // only allow for methods 1938 if (!privileged) break; // only allow in privileged code 1939 return _method_JvmtiHideEvents; 1940 } 1941 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): { 1942 if (_location != _in_method) break; // only allow for methods 1943 if (!privileged) break; // only allow in privileged code 1944 return _method_JvmtiMountTransition; 1945 } 1946 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 1947 if (_location != _in_method) break; // only allow for methods 1948 if (!privileged) break; // only allow in privileged code 1949 return _method_InjectedProfile; 1950 } 1951 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 1952 if (_location != _in_method) break; // only allow for methods 1953 if (!privileged) break; // only allow in privileged code 1954 return _method_LambdaForm_Compiled; 1955 } 1956 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 1957 if (_location != _in_method) break; // only allow for methods 1958 if (!privileged) break; // only allow in privileged code 1959 return _method_Hidden; 1960 } 1961 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): { 1962 if (_location != _in_method) break; // only allow for methods 1963 if (!privileged) break; // only allow in privileged code 1964 return _method_Scoped; 1965 } 1966 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): { 1967 if (_location != _in_method) break; // only allow for methods 1968 if (!privileged) break; // only allow in privileged code 1969 return _method_IntrinsicCandidate; 1970 } 1971 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 1972 if (_location != _in_field) break; // only allow for fields 1973 if (!privileged) break; // only allow in privileged code 1974 return _field_Stable; 1975 } 1976 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_TrustFinalFields_signature): { 1977 if (_location != _in_class) break; // only allow for classes 1978 if (!privileged) break; // only allow in privileged code 1979 return _jdk_internal_vm_annotation_TrustFinalFields; 1980 } 1981 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 1982 if (_location != _in_field && _location != _in_class) { 1983 break; // only allow for fields and classes 1984 } 1985 if (!EnableContended || (RestrictContended && !privileged)) { 1986 break; // honor privileges 1987 } 1988 return _jdk_internal_vm_annotation_Contended; 1989 } 1990 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 1991 if (_location != _in_method) break; // only allow for methods 1992 if (RestrictReservedStack && !privileged) break; // honor privileges 1993 return _jdk_internal_vm_annotation_ReservedStackAccess; 1994 } 1995 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): { 1996 if (_location != _in_class) break; // only allow for classes 1997 if (!privileged) break; // only allow in privileged code 1998 return _jdk_internal_ValueBased; 1999 } 2000 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): { 2001 if (_location != _in_class) break; // only allow for classes 2002 return _jdk_internal_LooselyConsistentValue; 2003 } 2004 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): { 2005 if (_location != _in_field) break; // only allow for fields 2006 return _jdk_internal_NullRestricted; 2007 } 2008 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): { 2009 return _java_lang_Deprecated; 2010 } 2011 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): { 2012 if (_location != _in_class) break; // only allow for classes 2013 if (!privileged) break; // only allow in privileged code 2014 return _jdk_internal_vm_annotation_AOTSafeClassInitializer; 2015 } 2016 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): { 2017 if (_location != _in_method) break; // only allow for methods 2018 if (!privileged) break; // only allow in privileged code 2019 return _method_AOTRuntimeSetup; 2020 } 2021 default: { 2022 break; 2023 } 2024 } 2025 return AnnotationCollector::_unknown; 2026 } 2027 2028 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2029 if (is_contended()) 2030 // Setting the contended group also sets the contended bit in field flags 2031 f->set_contended_group(contended_group()); 2032 if (is_stable()) 2033 (f->field_flags_addr())->update_stable(true); 2034 } 2035 2036 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2037 // If there's an error deallocate metadata for field annotations 2038 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2039 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2040 } 2041 2042 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2043 if (has_annotation(_method_CallerSensitive)) 2044 m->set_caller_sensitive(); 2045 if (has_annotation(_method_ForceInline)) 2046 m->set_force_inline(); 2047 if (has_annotation(_method_DontInline)) 2048 m->set_dont_inline(); 2049 if (has_annotation(_method_ChangesCurrentThread)) 2050 m->set_changes_current_thread(); 2051 if (has_annotation(_method_JvmtiHideEvents)) 2052 m->set_jvmti_hide_events(); 2053 if (has_annotation(_method_JvmtiMountTransition)) 2054 m->set_jvmti_mount_transition(); 2055 if (has_annotation(_method_InjectedProfile)) 2056 m->set_has_injected_profile(); 2057 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2058 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2059 if (has_annotation(_method_Hidden)) 2060 m->set_is_hidden(); 2061 if (has_annotation(_method_Scoped)) 2062 m->set_scoped(); 2063 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic()) 2064 m->set_intrinsic_candidate(); 2065 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2066 m->set_has_reserved_stack_access(); 2067 if (has_annotation(_java_lang_Deprecated)) 2068 m->set_deprecated(); 2069 if (has_annotation(_java_lang_Deprecated_for_removal)) 2070 m->set_deprecated_for_removal(); 2071 } 2072 2073 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2074 assert(ik != nullptr, "invariant"); 2075 if (has_annotation(_jdk_internal_vm_annotation_Contended)) { 2076 ik->set_is_contended(is_contended()); 2077 } 2078 if (has_annotation(_jdk_internal_ValueBased)) { 2079 ik->set_has_value_based_class_annotation(); 2080 if (DiagnoseSyncOnValueBasedClasses) { 2081 ik->set_is_value_based(); 2082 } 2083 } 2084 if (has_annotation(_java_lang_Deprecated)) { 2085 Array<Method*>* methods = ik->methods(); 2086 int length = ik->methods()->length(); 2087 for (int i = 0; i < length; i++) { 2088 Method* m = methods->at(i); 2089 m->set_deprecated(); 2090 } 2091 } 2092 if (has_annotation(_java_lang_Deprecated_for_removal)) { 2093 Array<Method*>* methods = ik->methods(); 2094 int length = ik->methods()->length(); 2095 for (int i = 0; i < length; i++) { 2096 Method* m = methods->at(i); 2097 m->set_deprecated_for_removal(); 2098 } 2099 } 2100 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) { 2101 ik->set_has_aot_safe_initializer(); 2102 } 2103 if (has_annotation(_jdk_internal_vm_annotation_TrustFinalFields)) { 2104 ik->set_trust_final_fields(true); 2105 } 2106 } 2107 2108 #define MAX_ARGS_SIZE 255 2109 #define MAX_CODE_SIZE 65535 2110 #define INITIAL_MAX_LVT_NUMBER 256 2111 2112 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2113 * 2114 * Rules for LVT's and LVTT's are: 2115 * - There can be any number of LVT's and LVTT's. 2116 * - If there are n LVT's, it is the same as if there was just 2117 * one LVT containing all the entries from the n LVT's. 2118 * - There may be no more than one LVT entry per local variable. 2119 * Two LVT entries are 'equal' if these fields are the same: 2120 * start_pc, length, name, slot 2121 * - There may be no more than one LVTT entry per each LVT entry. 2122 * Each LVTT entry has to match some LVT entry. 2123 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2124 */ 2125 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2126 int lvt_cnt, 2127 u2* const localvariable_table_length, 2128 const unsafe_u2** const localvariable_table_start, 2129 int lvtt_cnt, 2130 u2* const localvariable_type_table_length, 2131 const unsafe_u2** const localvariable_type_table_start, 2132 TRAPS) { 2133 2134 ResourceMark rm(THREAD); 2135 2136 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*, 2137 256, AnyObj::RESOURCE_AREA, mtInternal, 2138 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2139 2140 LVT_HashTable* const table = new LVT_HashTable(); 2141 2142 // To fill LocalVariableTable in 2143 const Classfile_LVT_Element* cf_lvt; 2144 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2145 2146 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2147 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2148 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2149 copy_lvt_element(&cf_lvt[idx], lvt); 2150 // If no duplicates, add LVT elem in hashtable. 2151 if (table->put(*lvt, lvt) == false 2152 && _need_verify 2153 && _major_version >= JAVA_1_5_VERSION) { 2154 classfile_parse_error("Duplicated LocalVariableTable attribute " 2155 "entry for '%s' in class file %s", 2156 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2157 THREAD); 2158 return; 2159 } 2160 } 2161 } 2162 2163 // To merge LocalVariableTable and LocalVariableTypeTable 2164 const Classfile_LVT_Element* cf_lvtt; 2165 LocalVariableTableElement lvtt_elem; 2166 2167 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2168 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2169 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2170 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2171 LocalVariableTableElement** entry = table->get(lvtt_elem); 2172 if (entry == nullptr) { 2173 if (_need_verify) { 2174 classfile_parse_error("LVTT entry for '%s' in class file %s " 2175 "does not match any LVT entry", 2176 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2177 THREAD); 2178 return; 2179 } 2180 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2181 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2182 "entry for '%s' in class file %s", 2183 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2184 THREAD); 2185 return; 2186 } else { 2187 // to add generic signatures into LocalVariableTable 2188 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2189 } 2190 } 2191 } 2192 } 2193 2194 2195 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2196 const u1* runtime_visible_annotations, 2197 int runtime_visible_annotations_length, 2198 const u1* runtime_visible_parameter_annotations, 2199 int runtime_visible_parameter_annotations_length, 2200 const u1* runtime_visible_type_annotations, 2201 int runtime_visible_type_annotations_length, 2202 const u1* annotation_default, 2203 int annotation_default_length, 2204 TRAPS) { 2205 2206 AnnotationArray* a; 2207 2208 if (runtime_visible_annotations_length > 0) { 2209 a = allocate_annotations(runtime_visible_annotations, 2210 runtime_visible_annotations_length, 2211 CHECK); 2212 cm->set_method_annotations(a); 2213 } 2214 2215 if (runtime_visible_parameter_annotations_length > 0) { 2216 a = allocate_annotations(runtime_visible_parameter_annotations, 2217 runtime_visible_parameter_annotations_length, 2218 CHECK); 2219 cm->set_parameter_annotations(a); 2220 } 2221 2222 if (annotation_default_length > 0) { 2223 a = allocate_annotations(annotation_default, 2224 annotation_default_length, 2225 CHECK); 2226 cm->set_default_annotations(a); 2227 } 2228 2229 if (runtime_visible_type_annotations_length > 0) { 2230 a = allocate_annotations(runtime_visible_type_annotations, 2231 runtime_visible_type_annotations_length, 2232 CHECK); 2233 cm->set_type_annotations(a); 2234 } 2235 } 2236 2237 2238 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2239 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2240 // Method* to save footprint, so we only know the size of the resulting Method* when the 2241 // entire method attribute is parsed. 2242 // 2243 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass. 2244 2245 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2246 bool is_interface, 2247 bool is_value_class, 2248 bool is_abstract_class, 2249 const ConstantPool* cp, 2250 bool* const has_localvariable_table, 2251 TRAPS) { 2252 assert(cfs != nullptr, "invariant"); 2253 assert(cp != nullptr, "invariant"); 2254 assert(has_localvariable_table != nullptr, "invariant"); 2255 2256 ResourceMark rm(THREAD); 2257 // Parse fixed parts: 2258 // access_flags, name_index, descriptor_index, attributes_count 2259 cfs->guarantee_more(8, CHECK_NULL); 2260 2261 u2 flags = cfs->get_u2_fast(); 2262 const u2 name_index = cfs->get_u2_fast(); 2263 const int cp_size = cp->length(); 2264 guarantee_property( 2265 valid_symbol_at(name_index), 2266 "Illegal constant pool index %u for method name in class file %s", 2267 name_index, CHECK_NULL); 2268 const Symbol* const name = cp->symbol_at(name_index); 2269 verify_legal_method_name(name, CHECK_NULL); 2270 2271 const u2 signature_index = cfs->get_u2_fast(); 2272 guarantee_property( 2273 valid_symbol_at(signature_index), 2274 "Illegal constant pool index %u for method signature in class file %s", 2275 signature_index, CHECK_NULL); 2276 const Symbol* const signature = cp->symbol_at(signature_index); 2277 2278 if (name == vmSymbols::class_initializer_name()) { 2279 // We ignore the other access flags for a valid class initializer. 2280 // (JVM Spec 2nd ed., chapter 4.6) 2281 if (_major_version < 51) { // backward compatibility 2282 flags = JVM_ACC_STATIC; 2283 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2284 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0); 2285 } else { 2286 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD); 2287 return nullptr; 2288 } 2289 } else { 2290 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL); 2291 } 2292 2293 if (name == vmSymbols::object_initializer_name() && is_interface) { 2294 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD); 2295 return nullptr; 2296 } 2297 2298 if (Arguments::is_valhalla_enabled()) { 2299 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED) 2300 && ((flags & JVM_ACC_STATIC) == 0 ) 2301 && !_access_flags.is_identity_class()) { 2302 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD); 2303 return nullptr; 2304 } 2305 } 2306 2307 int args_size = -1; // only used when _need_verify is true 2308 if (_need_verify) { 2309 verify_legal_name_with_signature(name, signature, CHECK_NULL); 2310 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2311 verify_legal_method_signature(name, signature, CHECK_NULL); 2312 if (args_size > MAX_ARGS_SIZE) { 2313 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD); 2314 return nullptr; 2315 } 2316 } 2317 2318 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2319 2320 // Default values for code and exceptions attribute elements 2321 u2 max_stack = 0; 2322 u2 max_locals = 0; 2323 u4 code_length = 0; 2324 const u1* code_start = nullptr; 2325 u2 exception_table_length = 0; 2326 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements 2327 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2328 u2 checked_exceptions_length = 0; 2329 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements 2330 CompressedLineNumberWriteStream* linenumber_table = nullptr; 2331 int linenumber_table_length = 0; 2332 int total_lvt_length = 0; 2333 u2 lvt_cnt = 0; 2334 u2 lvtt_cnt = 0; 2335 bool lvt_allocated = false; 2336 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2337 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2338 u2* localvariable_table_length = nullptr; 2339 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes 2340 u2* localvariable_type_table_length = nullptr; 2341 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes 2342 int method_parameters_length = -1; 2343 const u1* method_parameters_data = nullptr; 2344 bool method_parameters_seen = false; 2345 bool parsed_code_attribute = false; 2346 bool parsed_checked_exceptions_attribute = false; 2347 bool parsed_stackmap_attribute = false; 2348 // stackmap attribute - JDK1.5 2349 const u1* stackmap_data = nullptr; 2350 int stackmap_data_length = 0; 2351 u2 generic_signature_index = 0; 2352 MethodAnnotationCollector parsed_annotations; 2353 const u1* runtime_visible_annotations = nullptr; 2354 int runtime_visible_annotations_length = 0; 2355 const u1* runtime_visible_parameter_annotations = nullptr; 2356 int runtime_visible_parameter_annotations_length = 0; 2357 const u1* runtime_visible_type_annotations = nullptr; 2358 int runtime_visible_type_annotations_length = 0; 2359 bool runtime_invisible_annotations_exists = false; 2360 bool runtime_invisible_type_annotations_exists = false; 2361 bool runtime_invisible_parameter_annotations_exists = false; 2362 const u1* annotation_default = nullptr; 2363 int annotation_default_length = 0; 2364 2365 // Parse code and exceptions attribute 2366 u2 method_attributes_count = cfs->get_u2_fast(); 2367 while (method_attributes_count--) { 2368 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2369 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2370 const u4 method_attribute_length = cfs->get_u4_fast(); 2371 guarantee_property( 2372 valid_symbol_at(method_attribute_name_index), 2373 "Invalid method attribute name index %u in class file %s", 2374 method_attribute_name_index, CHECK_NULL); 2375 2376 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2377 if (method_attribute_name == vmSymbols::tag_code()) { 2378 // Parse Code attribute 2379 if (_need_verify) { 2380 guarantee_property( 2381 !access_flags.is_native() && !access_flags.is_abstract(), 2382 "Code attribute in native or abstract methods in class file %s", 2383 CHECK_NULL); 2384 } 2385 if (parsed_code_attribute) { 2386 classfile_parse_error("Multiple Code attributes in class file %s", 2387 THREAD); 2388 return nullptr; 2389 } 2390 parsed_code_attribute = true; 2391 2392 // Stack size, locals size, and code size 2393 cfs->guarantee_more(8, CHECK_NULL); 2394 max_stack = cfs->get_u2_fast(); 2395 max_locals = cfs->get_u2_fast(); 2396 code_length = cfs->get_u4_fast(); 2397 if (_need_verify) { 2398 guarantee_property(args_size <= max_locals, 2399 "Arguments can't fit into locals in class file %s", 2400 CHECK_NULL); 2401 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2402 "Invalid method Code length %u in class file %s", 2403 code_length, CHECK_NULL); 2404 } 2405 // Code pointer 2406 code_start = cfs->current(); 2407 assert(code_start != nullptr, "null code start"); 2408 cfs->guarantee_more(code_length, CHECK_NULL); 2409 cfs->skip_u1_fast(code_length); 2410 2411 // Exception handler table 2412 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2413 exception_table_length = cfs->get_u2_fast(); 2414 if (exception_table_length > 0) { 2415 exception_table_start = parse_exception_table(cfs, 2416 code_length, 2417 exception_table_length, 2418 CHECK_NULL); 2419 } 2420 2421 // Parse additional attributes in code attribute 2422 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2423 u2 code_attributes_count = cfs->get_u2_fast(); 2424 2425 unsigned int calculated_attribute_length = 0; 2426 2427 calculated_attribute_length = 2428 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2429 calculated_attribute_length += checked_cast<unsigned int>( 2430 code_length + 2431 sizeof(exception_table_length) + 2432 sizeof(code_attributes_count) + 2433 exception_table_length * 2434 ( sizeof(u2) + // start_pc 2435 sizeof(u2) + // end_pc 2436 sizeof(u2) + // handler_pc 2437 sizeof(u2) )); // catch_type_index 2438 2439 while (code_attributes_count--) { 2440 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2441 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2442 const u4 code_attribute_length = cfs->get_u4_fast(); 2443 calculated_attribute_length += code_attribute_length + 2444 (unsigned)sizeof(code_attribute_name_index) + 2445 (unsigned)sizeof(code_attribute_length); 2446 guarantee_property(valid_symbol_at(code_attribute_name_index), 2447 "Invalid code attribute name index %u in class file %s", 2448 code_attribute_name_index, 2449 CHECK_NULL); 2450 if (LoadLineNumberTables && 2451 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2452 // Parse and compress line number table 2453 parse_linenumber_table(code_attribute_length, 2454 code_length, 2455 &linenumber_table, 2456 CHECK_NULL); 2457 2458 } else if (LoadLocalVariableTables && 2459 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2460 // Parse local variable table 2461 if (!lvt_allocated) { 2462 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2463 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2464 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2465 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2466 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2467 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2468 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2469 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2470 lvt_allocated = true; 2471 } 2472 if (lvt_cnt == max_lvt_cnt) { 2473 max_lvt_cnt <<= 1; 2474 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2475 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2476 } 2477 localvariable_table_start[lvt_cnt] = 2478 parse_localvariable_table(cfs, 2479 code_length, 2480 max_locals, 2481 code_attribute_length, 2482 &localvariable_table_length[lvt_cnt], 2483 false, // is not LVTT 2484 CHECK_NULL); 2485 total_lvt_length += localvariable_table_length[lvt_cnt]; 2486 lvt_cnt++; 2487 } else if (LoadLocalVariableTypeTables && 2488 _major_version >= JAVA_1_5_VERSION && 2489 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2490 if (!lvt_allocated) { 2491 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2492 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2493 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2494 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2495 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2496 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2497 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2498 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2499 lvt_allocated = true; 2500 } 2501 // Parse local variable type table 2502 if (lvtt_cnt == max_lvtt_cnt) { 2503 max_lvtt_cnt <<= 1; 2504 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2505 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2506 } 2507 localvariable_type_table_start[lvtt_cnt] = 2508 parse_localvariable_table(cfs, 2509 code_length, 2510 max_locals, 2511 code_attribute_length, 2512 &localvariable_type_table_length[lvtt_cnt], 2513 true, // is LVTT 2514 CHECK_NULL); 2515 lvtt_cnt++; 2516 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2517 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2518 // Stack map is only needed by the new verifier in JDK1.5. 2519 if (parsed_stackmap_attribute) { 2520 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD); 2521 return nullptr; 2522 } 2523 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL); 2524 stackmap_data_length = code_attribute_length; 2525 parsed_stackmap_attribute = true; 2526 } else { 2527 // Skip unknown attributes 2528 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2529 } 2530 } 2531 // check method attribute length 2532 if (_need_verify) { 2533 guarantee_property(method_attribute_length == calculated_attribute_length, 2534 "Code segment has wrong length in class file %s", 2535 CHECK_NULL); 2536 } 2537 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2538 // Parse Exceptions attribute 2539 if (parsed_checked_exceptions_attribute) { 2540 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2541 THREAD); 2542 return nullptr; 2543 } 2544 parsed_checked_exceptions_attribute = true; 2545 checked_exceptions_start = 2546 parse_checked_exceptions(cfs, 2547 &checked_exceptions_length, 2548 method_attribute_length, 2549 CHECK_NULL); 2550 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2551 // reject multiple method parameters 2552 if (method_parameters_seen) { 2553 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2554 THREAD); 2555 return nullptr; 2556 } 2557 method_parameters_seen = true; 2558 method_parameters_length = cfs->get_u1_fast(); 2559 const u4 real_length = (method_parameters_length * 4u) + 1u; 2560 if (method_attribute_length != real_length) { 2561 classfile_parse_error( 2562 "Invalid MethodParameters method attribute length %u in class file", 2563 method_attribute_length, THREAD); 2564 return nullptr; 2565 } 2566 method_parameters_data = cfs->current(); 2567 cfs->skip_u2_fast(method_parameters_length); 2568 cfs->skip_u2_fast(method_parameters_length); 2569 // ignore this attribute if it cannot be reflected 2570 if (!vmClasses::reflect_Parameter_klass_is_loaded()) 2571 method_parameters_length = -1; 2572 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2573 if (method_attribute_length != 0) { 2574 classfile_parse_error( 2575 "Invalid Synthetic method attribute length %u in class file %s", 2576 method_attribute_length, THREAD); 2577 return nullptr; 2578 } 2579 // Should we check that there hasn't already been a synthetic attribute? 2580 access_flags.set_is_synthetic(); 2581 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2582 if (method_attribute_length != 0) { 2583 classfile_parse_error( 2584 "Invalid Deprecated method attribute length %u in class file %s", 2585 method_attribute_length, THREAD); 2586 return nullptr; 2587 } 2588 } else if (_major_version >= JAVA_1_5_VERSION) { 2589 if (method_attribute_name == vmSymbols::tag_signature()) { 2590 if (generic_signature_index != 0) { 2591 classfile_parse_error( 2592 "Multiple Signature attributes for method in class file %s", 2593 THREAD); 2594 return nullptr; 2595 } 2596 if (method_attribute_length != 2) { 2597 classfile_parse_error( 2598 "Invalid Signature attribute length %u in class file %s", 2599 method_attribute_length, THREAD); 2600 return nullptr; 2601 } 2602 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2603 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2604 if (runtime_visible_annotations != nullptr) { 2605 classfile_parse_error( 2606 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2607 THREAD); 2608 return nullptr; 2609 } 2610 runtime_visible_annotations_length = method_attribute_length; 2611 runtime_visible_annotations = cfs->current(); 2612 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 2613 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2614 parse_annotations(cp, 2615 runtime_visible_annotations, 2616 runtime_visible_annotations_length, 2617 &parsed_annotations, 2618 _loader_data, 2619 _can_access_vm_annotations); 2620 cfs->skip_u1_fast(runtime_visible_annotations_length); 2621 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2622 if (runtime_invisible_annotations_exists) { 2623 classfile_parse_error( 2624 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2625 THREAD); 2626 return nullptr; 2627 } 2628 runtime_invisible_annotations_exists = true; 2629 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2630 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2631 if (runtime_visible_parameter_annotations != nullptr) { 2632 classfile_parse_error( 2633 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2634 THREAD); 2635 return nullptr; 2636 } 2637 runtime_visible_parameter_annotations_length = method_attribute_length; 2638 runtime_visible_parameter_annotations = cfs->current(); 2639 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations"); 2640 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2641 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2642 if (runtime_invisible_parameter_annotations_exists) { 2643 classfile_parse_error( 2644 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2645 THREAD); 2646 return nullptr; 2647 } 2648 runtime_invisible_parameter_annotations_exists = true; 2649 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2650 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2651 if (annotation_default != nullptr) { 2652 classfile_parse_error( 2653 "Multiple AnnotationDefault attributes for method in class file %s", 2654 THREAD); 2655 return nullptr; 2656 } 2657 annotation_default_length = method_attribute_length; 2658 annotation_default = cfs->current(); 2659 assert(annotation_default != nullptr, "null annotation default"); 2660 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2661 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2662 if (runtime_visible_type_annotations != nullptr) { 2663 classfile_parse_error( 2664 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2665 THREAD); 2666 return nullptr; 2667 } 2668 runtime_visible_type_annotations_length = method_attribute_length; 2669 runtime_visible_type_annotations = cfs->current(); 2670 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 2671 // No need for the VM to parse Type annotations 2672 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2673 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2674 if (runtime_invisible_type_annotations_exists) { 2675 classfile_parse_error( 2676 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2677 THREAD); 2678 return nullptr; 2679 } 2680 runtime_invisible_type_annotations_exists = true; 2681 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2682 } else { 2683 // Skip unknown attributes 2684 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2685 } 2686 } else { 2687 // Skip unknown attributes 2688 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2689 } 2690 } 2691 2692 if (linenumber_table != nullptr) { 2693 linenumber_table->write_terminator(); 2694 linenumber_table_length = linenumber_table->position(); 2695 } 2696 2697 // Make sure there's at least one Code attribute in non-native/non-abstract method 2698 if (_need_verify) { 2699 guarantee_property(access_flags.is_native() || 2700 access_flags.is_abstract() || 2701 parsed_code_attribute, 2702 "Absent Code attribute in method that is not native or abstract in class file %s", 2703 CHECK_NULL); 2704 } 2705 2706 // All sizing information for a Method* is finally available, now create it 2707 InlineTableSizes sizes( 2708 total_lvt_length, 2709 linenumber_table_length, 2710 exception_table_length, 2711 checked_exceptions_length, 2712 method_parameters_length, 2713 generic_signature_index, 2714 runtime_visible_annotations_length, 2715 runtime_visible_parameter_annotations_length, 2716 runtime_visible_type_annotations_length, 2717 annotation_default_length, 2718 0); 2719 2720 Method* const m = Method::allocate(_loader_data, 2721 code_length, 2722 access_flags, 2723 &sizes, 2724 ConstMethod::NORMAL, 2725 _cp->symbol_at(name_index), 2726 CHECK_NULL); 2727 2728 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2729 2730 // Fill in information from fixed part (access_flags already set) 2731 m->set_constants(_cp); 2732 m->set_name_index(name_index); 2733 m->set_signature_index(signature_index); 2734 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static()); 2735 assert(args_size < 0 || args_size == m->size_of_parameters(), ""); 2736 2737 // Fill in code attribute information 2738 m->set_max_stack(max_stack); 2739 m->set_max_locals(max_locals); 2740 if (stackmap_data != nullptr) { 2741 m->constMethod()->copy_stackmap_data(_loader_data, 2742 (u1*)stackmap_data, 2743 stackmap_data_length, 2744 CHECK_NULL); 2745 } 2746 2747 // Copy byte codes 2748 m->set_code((u1*)code_start); 2749 2750 // Copy line number table 2751 if (linenumber_table != nullptr) { 2752 memcpy(m->compressed_linenumber_table(), 2753 linenumber_table->buffer(), 2754 linenumber_table_length); 2755 } 2756 2757 // Copy exception table 2758 if (exception_table_length > 0) { 2759 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2760 m->exception_table_start(), 2761 exception_table_length * sizeof(ExceptionTableElement), 2762 sizeof(u2)); 2763 } 2764 2765 // Copy method parameters 2766 if (method_parameters_length > 0) { 2767 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2768 for (int i = 0; i < method_parameters_length; i++) { 2769 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2770 method_parameters_data += 2; 2771 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2772 method_parameters_data += 2; 2773 } 2774 } 2775 2776 // Copy checked exceptions 2777 if (checked_exceptions_length > 0) { 2778 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2779 m->checked_exceptions_start(), 2780 checked_exceptions_length * sizeof(CheckedExceptionElement), 2781 sizeof(u2)); 2782 } 2783 2784 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2785 if (total_lvt_length > 0) { 2786 *has_localvariable_table = true; 2787 copy_localvariable_table(m->constMethod(), 2788 lvt_cnt, 2789 localvariable_table_length, 2790 localvariable_table_start, 2791 lvtt_cnt, 2792 localvariable_type_table_length, 2793 localvariable_type_table_start, 2794 CHECK_NULL); 2795 } 2796 2797 if (parsed_annotations.has_any_annotations()) 2798 parsed_annotations.apply_to(methodHandle(THREAD, m)); 2799 2800 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'. 2801 m->set_is_hidden(); 2802 } 2803 if (parsed_annotations.has_aot_runtime_setup()) { 2804 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() || 2805 !access_flags.is_private() || !access_flags.is_static()) { 2806 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL); 2807 } 2808 _has_aot_runtime_setup_method = true; 2809 } 2810 2811 // Copy annotations 2812 copy_method_annotations(m->constMethod(), 2813 runtime_visible_annotations, 2814 runtime_visible_annotations_length, 2815 runtime_visible_parameter_annotations, 2816 runtime_visible_parameter_annotations_length, 2817 runtime_visible_type_annotations, 2818 runtime_visible_type_annotations_length, 2819 annotation_default, 2820 annotation_default_length, 2821 CHECK_NULL); 2822 2823 if (InstanceKlass::is_finalization_enabled() && 2824 name == vmSymbols::finalize_method_name() && 2825 signature == vmSymbols::void_method_signature()) { 2826 if (m->is_empty_method()) { 2827 _has_empty_finalizer = true; 2828 } else { 2829 _has_finalizer = true; 2830 } 2831 } 2832 2833 NOT_PRODUCT(m->verify()); 2834 return m; 2835 } 2836 2837 2838 // Side-effects: populates the _methods field in the parser 2839 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2840 bool is_interface, 2841 bool is_value_class, 2842 bool is_abstract_type, 2843 bool* const has_localvariable_table, 2844 bool* has_final_method, 2845 bool* declares_nonstatic_concrete_methods, 2846 TRAPS) { 2847 assert(cfs != nullptr, "invariant"); 2848 assert(has_localvariable_table != nullptr, "invariant"); 2849 assert(has_final_method != nullptr, "invariant"); 2850 assert(declares_nonstatic_concrete_methods != nullptr, "invariant"); 2851 2852 assert(nullptr == _methods, "invariant"); 2853 2854 cfs->guarantee_more(2, CHECK); // length 2855 const u2 length = cfs->get_u2_fast(); 2856 if (length == 0) { 2857 _methods = Universe::the_empty_method_array(); 2858 } else { 2859 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2860 length, 2861 nullptr, 2862 CHECK); 2863 2864 for (int index = 0; index < length; index++) { 2865 Method* method = parse_method(cfs, 2866 is_interface, 2867 is_value_class, 2868 is_abstract_type, 2869 _cp, 2870 has_localvariable_table, 2871 CHECK); 2872 2873 if (method->is_final()) { 2874 *has_final_method = true; 2875 } 2876 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2877 // used for interface initialization, and default method inheritance analysis 2878 if (is_interface && !(*declares_nonstatic_concrete_methods) 2879 && !method->is_abstract() && !method->is_static()) { 2880 *declares_nonstatic_concrete_methods = true; 2881 } 2882 _methods->at_put(index, method); 2883 } 2884 2885 if (_need_verify && length > 1) { 2886 // Check duplicated methods 2887 ResourceMark rm(THREAD); 2888 // Set containing name-signature pairs 2889 NameSigHashtable* names_and_sigs = new NameSigHashtable(); 2890 for (int i = 0; i < length; i++) { 2891 const Method* const m = _methods->at(i); 2892 NameSigHash name_and_sig(m->name(), m->signature()); 2893 // If no duplicates, add name/signature in hashtable names_and_sigs. 2894 if(!names_and_sigs->put(name_and_sig, 0)) { 2895 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2896 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); 2897 return; 2898 } 2899 } 2900 } 2901 } 2902 } 2903 2904 static const intArray* sort_methods(Array<Method*>* methods) { 2905 const int length = methods->length(); 2906 // If JVMTI original method ordering or sharing is enabled we have to 2907 // remember the original class file ordering. 2908 // We temporarily use the vtable_index field in the Method* to store the 2909 // class file index, so we can read in after calling qsort. 2910 // Put the method ordering in the shared archive. 2911 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { 2912 for (int index = 0; index < length; index++) { 2913 Method* const m = methods->at(index); 2914 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2915 m->set_vtable_index(index); 2916 } 2917 } 2918 // Sort method array by ascending method name (for faster lookups & vtable construction) 2919 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2920 Method::sort_methods(methods); 2921 2922 intArray* method_ordering = nullptr; 2923 // If JVMTI original method ordering or sharing is enabled construct int 2924 // array remembering the original ordering 2925 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { 2926 method_ordering = new intArray(length, length, -1); 2927 for (int index = 0; index < length; index++) { 2928 Method* const m = methods->at(index); 2929 const int old_index = m->vtable_index(); 2930 assert(old_index >= 0 && old_index < length, "invalid method index"); 2931 method_ordering->at_put(index, old_index); 2932 m->set_vtable_index(Method::invalid_vtable_index); 2933 } 2934 } 2935 return method_ordering; 2936 } 2937 2938 // Parse generic_signature attribute for methods and fields 2939 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 2940 TRAPS) { 2941 assert(cfs != nullptr, "invariant"); 2942 2943 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2944 const u2 generic_signature_index = cfs->get_u2_fast(); 2945 guarantee_property( 2946 valid_symbol_at(generic_signature_index), 2947 "Invalid Signature attribute at constant pool index %u in class file %s", 2948 generic_signature_index, CHECK_0); 2949 return generic_signature_index; 2950 } 2951 2952 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 2953 TRAPS) { 2954 2955 assert(cfs != nullptr, "invariant"); 2956 2957 cfs->guarantee_more(2, CHECK); // sourcefile_index 2958 const u2 sourcefile_index = cfs->get_u2_fast(); 2959 guarantee_property( 2960 valid_symbol_at(sourcefile_index), 2961 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2962 sourcefile_index, CHECK); 2963 set_class_sourcefile_index(sourcefile_index); 2964 } 2965 2966 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 2967 int length, 2968 TRAPS) { 2969 assert(cfs != nullptr, "invariant"); 2970 2971 const u1* const sde_buffer = cfs->current(); 2972 assert(sde_buffer != nullptr, "null sde buffer"); 2973 2974 // Don't bother storing it if there is no way to retrieve it 2975 if (JvmtiExport::can_get_source_debug_extension()) { 2976 assert((length+1) > length, "Overflow checking"); 2977 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2978 for (int i = 0; i < length; i++) { 2979 sde[i] = sde_buffer[i]; 2980 } 2981 sde[length] = '\0'; 2982 set_class_sde_buffer((const char*)sde, length); 2983 } 2984 // Got utf8 string, set stream position forward 2985 cfs->skip_u1(length, CHECK); 2986 } 2987 2988 2989 // Inner classes can be static, private or protected (classic VM does this) 2990 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 2991 JVM_ACC_PRIVATE | \ 2992 JVM_ACC_PROTECTED | \ 2993 JVM_ACC_STATIC \ 2994 ) 2995 2996 // Find index of the InnerClasses entry for the specified inner_class_info_index. 2997 // Return -1 if none is found. 2998 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 2999 Symbol* cp_klass_name = cp->klass_name_at(inner); 3000 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 3001 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 3002 if (cp->klass_name_at(idx_inner) == cp_klass_name) { 3003 return idx; 3004 } 3005 } 3006 return -1; 3007 } 3008 3009 // Return the outer_class_info_index for the InnerClasses entry containing the 3010 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found. 3011 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 3012 if (inner == 0) return -1; 3013 int idx = inner_classes_find_index(inner_classes, inner, cp, length); 3014 if (idx == -1) return -1; 3015 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3016 return result; 3017 } 3018 3019 // Return true if circularity is found, false if no circularity is found. 3020 // Use Floyd's cycle finding algorithm. 3021 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) { 3022 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 3023 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3024 3025 while (fast != -1 && fast != 0) { 3026 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) { 3027 return true; // found a circularity 3028 } 3029 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3030 if (fast == -1) return false; 3031 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3032 if (fast == -1) return false; 3033 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length); 3034 assert(slow != -1, "sanity check"); 3035 } 3036 return false; 3037 } 3038 3039 // Loop through each InnerClasses entry checking for circularities and duplications 3040 // with other entries. If duplicate entries are found then throw CFE. Otherwise, 3041 // return true if a circularity or entries with duplicate inner_class_info_indexes 3042 // are found. 3043 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) { 3044 // Loop through each InnerClasses entry. 3045 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 3046 // Return true if there are circular entries. 3047 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) { 3048 return true; 3049 } 3050 // Check if there are duplicate entries or entries with the same inner_class_info_index. 3051 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length; 3052 y += InstanceKlass::inner_class_next_offset) { 3053 3054 // 4347400: make sure there's no duplicate entry in the classes array 3055 if (_major_version >= JAVA_1_5_VERSION) { 3056 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) || 3057 _inner_classes->at(idx+1) != _inner_classes->at(y+1) || 3058 _inner_classes->at(idx+2) != _inner_classes->at(y+2) || 3059 _inner_classes->at(idx+3) != _inner_classes->at(y+3)), 3060 "Duplicate entry in InnerClasses attribute in class file %s", 3061 CHECK_(true)); 3062 } 3063 // Return true if there are two entries with the same inner_class_info_index. 3064 if (_inner_classes->at(y) == _inner_classes->at(idx)) { 3065 return true; 3066 } 3067 } 3068 } 3069 return false; 3070 } 3071 3072 // Return number of classes in the inner classes attribute table 3073 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3074 const ConstantPool* cp, 3075 const u1* const inner_classes_attribute_start, 3076 bool parsed_enclosingmethod_attribute, 3077 u2 enclosing_method_class_index, 3078 u2 enclosing_method_method_index, 3079 TRAPS) { 3080 const u1* const current_mark = cfs->current(); 3081 u2 length = 0; 3082 if (inner_classes_attribute_start != nullptr) { 3083 cfs->set_current(inner_classes_attribute_start); 3084 cfs->guarantee_more(2, CHECK_0); // length 3085 length = cfs->get_u2_fast(); 3086 } 3087 3088 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3089 // method data: 3090 // [inner_class_info_index, 3091 // outer_class_info_index, 3092 // inner_name_index, 3093 // inner_class_access_flags, 3094 // ... 3095 // enclosing_method_class_index, 3096 // enclosing_method_method_index] 3097 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3098 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3099 _inner_classes = inner_classes; 3100 3101 int index = 0; 3102 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3103 for (int n = 0; n < length; n++) { 3104 // Inner class index 3105 const u2 inner_class_info_index = cfs->get_u2_fast(); 3106 guarantee_property( 3107 valid_klass_reference_at(inner_class_info_index), 3108 "inner_class_info_index %u has bad constant type in class file %s", 3109 inner_class_info_index, CHECK_0); 3110 // Outer class index 3111 const u2 outer_class_info_index = cfs->get_u2_fast(); 3112 guarantee_property( 3113 outer_class_info_index == 0 || 3114 valid_klass_reference_at(outer_class_info_index), 3115 "outer_class_info_index %u has bad constant type in class file %s", 3116 outer_class_info_index, CHECK_0); 3117 3118 if (outer_class_info_index != 0) { 3119 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index); 3120 char* bytes = (char*)outer_class_name->bytes(); 3121 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY, 3122 "Outer class is an array class in class file %s", CHECK_0); 3123 } 3124 // Inner class name 3125 const u2 inner_name_index = cfs->get_u2_fast(); 3126 guarantee_property( 3127 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3128 "inner_name_index %u has bad constant type in class file %s", 3129 inner_name_index, CHECK_0); 3130 if (_need_verify) { 3131 guarantee_property(inner_class_info_index != outer_class_info_index, 3132 "Class is both outer and inner class in class file %s", CHECK_0); 3133 } 3134 3135 // Access flags 3136 u2 flags; 3137 // JVM_ACC_MODULE is defined in JDK-9 and later. 3138 if (_major_version >= JAVA_9_VERSION) { 3139 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3140 } else { 3141 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3142 } 3143 3144 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3145 // Set abstract bit for old class files for backward compatibility 3146 flags |= JVM_ACC_ABSTRACT; 3147 } 3148 3149 if (!supports_inline_types()) { 3150 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 3151 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3152 if (!is_module && !is_interface) { 3153 flags |= JVM_ACC_IDENTITY; 3154 } 3155 } 3156 3157 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index); 3158 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0); 3159 AccessFlags inner_access_flags(flags); 3160 3161 inner_classes->at_put(index++, inner_class_info_index); 3162 inner_classes->at_put(index++, outer_class_info_index); 3163 inner_classes->at_put(index++, inner_name_index); 3164 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short()); 3165 } 3166 3167 // Check for circular and duplicate entries. 3168 bool has_circularity = false; 3169 if (_need_verify) { 3170 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0); 3171 if (has_circularity) { 3172 // If circularity check failed then ignore InnerClasses attribute. 3173 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 3174 index = 0; 3175 if (parsed_enclosingmethod_attribute) { 3176 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0); 3177 _inner_classes = inner_classes; 3178 } else { 3179 _inner_classes = Universe::the_empty_short_array(); 3180 } 3181 } 3182 } 3183 // Set EnclosingMethod class and method indexes. 3184 if (parsed_enclosingmethod_attribute) { 3185 inner_classes->at_put(index++, enclosing_method_class_index); 3186 inner_classes->at_put(index++, enclosing_method_method_index); 3187 } 3188 assert(index == size || has_circularity, "wrong size"); 3189 3190 // Restore buffer's current position. 3191 cfs->set_current(current_mark); 3192 3193 return length; 3194 } 3195 3196 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3197 const u1* const nest_members_attribute_start, 3198 TRAPS) { 3199 const u1* const current_mark = cfs->current(); 3200 u2 length = 0; 3201 if (nest_members_attribute_start != nullptr) { 3202 cfs->set_current(nest_members_attribute_start); 3203 cfs->guarantee_more(2, CHECK_0); // length 3204 length = cfs->get_u2_fast(); 3205 } 3206 const int size = length; 3207 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3208 _nest_members = nest_members; 3209 3210 int index = 0; 3211 cfs->guarantee_more(2 * length, CHECK_0); 3212 for (int n = 0; n < length; n++) { 3213 const u2 class_info_index = cfs->get_u2_fast(); 3214 guarantee_property( 3215 valid_klass_reference_at(class_info_index), 3216 "Nest member class_info_index %u has bad constant type in class file %s", 3217 class_info_index, CHECK_0); 3218 nest_members->at_put(index++, class_info_index); 3219 } 3220 assert(index == size, "wrong size"); 3221 3222 // Restore buffer's current position. 3223 cfs->set_current(current_mark); 3224 3225 return length; 3226 } 3227 3228 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs, 3229 const u1* const permitted_subclasses_attribute_start, 3230 TRAPS) { 3231 const u1* const current_mark = cfs->current(); 3232 u2 length = 0; 3233 if (permitted_subclasses_attribute_start != nullptr) { 3234 cfs->set_current(permitted_subclasses_attribute_start); 3235 cfs->guarantee_more(2, CHECK_0); // length 3236 length = cfs->get_u2_fast(); 3237 } 3238 const int size = length; 3239 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3240 _permitted_subclasses = permitted_subclasses; 3241 3242 if (length > 0) { 3243 int index = 0; 3244 cfs->guarantee_more(2 * length, CHECK_0); 3245 for (int n = 0; n < length; n++) { 3246 const u2 class_info_index = cfs->get_u2_fast(); 3247 guarantee_property( 3248 valid_klass_reference_at(class_info_index), 3249 "Permitted subclass class_info_index %u has bad constant type in class file %s", 3250 class_info_index, CHECK_0); 3251 permitted_subclasses->at_put(index++, class_info_index); 3252 } 3253 assert(index == size, "wrong size"); 3254 } 3255 3256 // Restore buffer's current position. 3257 cfs->set_current(current_mark); 3258 3259 return length; 3260 } 3261 3262 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs, 3263 const u1* const loadable_descriptors_attribute_start, 3264 TRAPS) { 3265 const u1* const current_mark = cfs->current(); 3266 u2 length = 0; 3267 if (loadable_descriptors_attribute_start != nullptr) { 3268 cfs->set_current(loadable_descriptors_attribute_start); 3269 cfs->guarantee_more(2, CHECK_0); // length 3270 length = cfs->get_u2_fast(); 3271 } 3272 const int size = length; 3273 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3274 _loadable_descriptors = loadable_descriptors; 3275 if (length > 0) { 3276 int index = 0; 3277 cfs->guarantee_more(2 * length, CHECK_0); 3278 for (int n = 0; n < length; n++) { 3279 const u2 descriptor_index = cfs->get_u2_fast(); 3280 guarantee_property( 3281 valid_symbol_at(descriptor_index), 3282 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s", 3283 descriptor_index, CHECK_0); 3284 Symbol* descriptor = _cp->symbol_at(descriptor_index); 3285 bool valid = legal_field_signature(descriptor, CHECK_0); 3286 if(!valid) { 3287 ResourceMark rm(THREAD); 3288 Exceptions::fthrow(THREAD_AND_LOCATION, 3289 vmSymbols::java_lang_ClassFormatError(), 3290 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"", 3291 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string()); 3292 return 0; 3293 } 3294 loadable_descriptors->at_put(index++, descriptor_index); 3295 } 3296 assert(index == size, "wrong size"); 3297 } 3298 3299 // Restore buffer's current position. 3300 cfs->set_current(current_mark); 3301 3302 return length; 3303 } 3304 3305 // Record { 3306 // u2 attribute_name_index; 3307 // u4 attribute_length; 3308 // u2 components_count; 3309 // component_info components[components_count]; 3310 // } 3311 // component_info { 3312 // u2 name_index; 3313 // u2 descriptor_index 3314 // u2 attributes_count; 3315 // attribute_info_attributes[attributes_count]; 3316 // } 3317 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, 3318 const ConstantPool* cp, 3319 const u1* const record_attribute_start, 3320 TRAPS) { 3321 const u1* const current_mark = cfs->current(); 3322 int components_count = 0; 3323 unsigned int calculate_attr_size = 0; 3324 if (record_attribute_start != nullptr) { 3325 cfs->set_current(record_attribute_start); 3326 cfs->guarantee_more(2, CHECK_0); // num of components 3327 components_count = (int)cfs->get_u2_fast(); 3328 calculate_attr_size = 2; 3329 } 3330 3331 Array<RecordComponent*>* const record_components = 3332 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0); 3333 _record_components = record_components; 3334 3335 for (int x = 0; x < components_count; x++) { 3336 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count 3337 3338 const u2 name_index = cfs->get_u2_fast(); 3339 guarantee_property(valid_symbol_at(name_index), 3340 "Invalid constant pool index %u for name in Record attribute in class file %s", 3341 name_index, CHECK_0); 3342 const Symbol* const name = cp->symbol_at(name_index); 3343 verify_legal_field_name(name, CHECK_0); 3344 3345 const u2 descriptor_index = cfs->get_u2_fast(); 3346 guarantee_property(valid_symbol_at(descriptor_index), 3347 "Invalid constant pool index %u for descriptor in Record attribute in class file %s", 3348 descriptor_index, CHECK_0); 3349 const Symbol* const descr = cp->symbol_at(descriptor_index); 3350 verify_legal_field_signature(name, descr, CHECK_0); 3351 3352 const u2 attributes_count = cfs->get_u2_fast(); 3353 calculate_attr_size += 6; 3354 u2 generic_sig_index = 0; 3355 const u1* runtime_visible_annotations = nullptr; 3356 int runtime_visible_annotations_length = 0; 3357 bool runtime_invisible_annotations_exists = false; 3358 const u1* runtime_visible_type_annotations = nullptr; 3359 int runtime_visible_type_annotations_length = 0; 3360 bool runtime_invisible_type_annotations_exists = false; 3361 3362 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, 3363 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. 3364 for (int y = 0; y < attributes_count; y++) { 3365 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length 3366 const u2 attribute_name_index = cfs->get_u2_fast(); 3367 const u4 attribute_length = cfs->get_u4_fast(); 3368 calculate_attr_size += 6; 3369 guarantee_property( 3370 valid_symbol_at(attribute_name_index), 3371 "Invalid Record attribute name index %u in class file %s", 3372 attribute_name_index, CHECK_0); 3373 3374 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 3375 if (attribute_name == vmSymbols::tag_signature()) { 3376 if (generic_sig_index != 0) { 3377 classfile_parse_error( 3378 "Multiple Signature attributes for Record component in class file %s", 3379 THREAD); 3380 return 0; 3381 } 3382 if (attribute_length != 2) { 3383 classfile_parse_error( 3384 "Invalid Signature attribute length %u in Record component in class file %s", 3385 attribute_length, THREAD); 3386 return 0; 3387 } 3388 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); 3389 3390 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 3391 if (runtime_visible_annotations != nullptr) { 3392 classfile_parse_error( 3393 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD); 3394 return 0; 3395 } 3396 runtime_visible_annotations_length = attribute_length; 3397 runtime_visible_annotations = cfs->current(); 3398 3399 assert(runtime_visible_annotations != nullptr, "null record component visible annotation"); 3400 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); 3401 cfs->skip_u1_fast(runtime_visible_annotations_length); 3402 3403 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 3404 if (runtime_invisible_annotations_exists) { 3405 classfile_parse_error( 3406 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD); 3407 return 0; 3408 } 3409 runtime_invisible_annotations_exists = true; 3410 cfs->skip_u1(attribute_length, CHECK_0); 3411 3412 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 3413 if (runtime_visible_type_annotations != nullptr) { 3414 classfile_parse_error( 3415 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3416 return 0; 3417 } 3418 runtime_visible_type_annotations_length = attribute_length; 3419 runtime_visible_type_annotations = cfs->current(); 3420 3421 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation"); 3422 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); 3423 cfs->skip_u1_fast(runtime_visible_type_annotations_length); 3424 3425 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 3426 if (runtime_invisible_type_annotations_exists) { 3427 classfile_parse_error( 3428 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3429 return 0; 3430 } 3431 runtime_invisible_type_annotations_exists = true; 3432 cfs->skip_u1(attribute_length, CHECK_0); 3433 3434 } else { 3435 // Skip unknown attributes 3436 cfs->skip_u1(attribute_length, CHECK_0); 3437 } 3438 calculate_attr_size += attribute_length; 3439 } // End of attributes For loop 3440 3441 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations, 3442 runtime_visible_annotations_length, 3443 CHECK_0); 3444 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations, 3445 runtime_visible_type_annotations_length, 3446 CHECK_0); 3447 3448 RecordComponent* record_component = 3449 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index, 3450 annotations, type_annotations, CHECK_0); 3451 record_components->at_put(x, record_component); 3452 } // End of component processing loop 3453 3454 // Restore buffer's current position. 3455 cfs->set_current(current_mark); 3456 return calculate_attr_size; 3457 } 3458 3459 void ClassFileParser::parse_classfile_synthetic_attribute() { 3460 set_class_synthetic_flag(true); 3461 } 3462 3463 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3464 assert(cfs != nullptr, "invariant"); 3465 3466 const u2 signature_index = cfs->get_u2(CHECK); 3467 guarantee_property( 3468 valid_symbol_at(signature_index), 3469 "Invalid constant pool index %u in Signature attribute in class file %s", 3470 signature_index, CHECK); 3471 set_class_generic_signature_index(signature_index); 3472 } 3473 3474 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3475 ConstantPool* cp, 3476 u4 attribute_byte_length, 3477 TRAPS) { 3478 assert(cfs != nullptr, "invariant"); 3479 assert(cp != nullptr, "invariant"); 3480 const int cp_size = cp->length(); 3481 3482 const u1* const current_before_parsing = cfs->current(); 3483 3484 guarantee_property(attribute_byte_length >= sizeof(u2), 3485 "Invalid BootstrapMethods attribute length %u in class file %s", 3486 attribute_byte_length, 3487 CHECK); 3488 3489 cfs->guarantee_more(attribute_byte_length, CHECK); 3490 3491 const int num_bootstrap_methods = cfs->get_u2_fast(); 3492 3493 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods, 3494 "Short length on BootstrapMethods in class file %s", 3495 CHECK); 3496 3497 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3498 3499 // Eagerly assign the arrays so that they will be deallocated with the constant 3500 // pool if there is an error. 3501 BSMAttributeEntries::InsertionIterator iter = 3502 cp->bsm_entries().start_extension(num_bootstrap_methods, 3503 bootstrap_methods_u2_len, 3504 _loader_data, 3505 CHECK); 3506 3507 for (int i = 0; i < num_bootstrap_methods; i++) { 3508 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3509 u2 bootstrap_method_ref = cfs->get_u2_fast(); 3510 u2 num_bootstrap_arguments = cfs->get_u2_fast(); 3511 guarantee_property( 3512 valid_cp_range(bootstrap_method_ref, cp_size) && 3513 cp->tag_at(bootstrap_method_ref).is_method_handle(), 3514 "bootstrap_method_index %u has bad constant type in class file %s", 3515 bootstrap_method_ref, 3516 CHECK); 3517 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc] 3518 3519 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments); 3520 guarantee_property(entry != nullptr, 3521 "Invalid BootstrapMethods num_bootstrap_methods." 3522 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK); 3523 3524 for (int argi = 0; argi < num_bootstrap_arguments; argi++) { 3525 const u2 argument_index = cfs->get_u2_fast(); 3526 guarantee_property( 3527 valid_cp_range(argument_index, cp_size) && 3528 cp->tag_at(argument_index).is_loadable_constant(), 3529 "argument_index %u has bad constant type in class file %s", 3530 argument_index, 3531 CHECK); 3532 entry->set_argument(argi, argument_index); 3533 } 3534 } 3535 cp->bsm_entries().end_extension(iter, _loader_data, CHECK); 3536 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(), 3537 "Bad length on BootstrapMethods in class file %s", 3538 CHECK); 3539 } 3540 3541 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3542 ConstantPool* cp, 3543 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3544 TRAPS) { 3545 assert(cfs != nullptr, "invariant"); 3546 assert(cp != nullptr, "invariant"); 3547 assert(parsed_annotations != nullptr, "invariant"); 3548 3549 // Set inner classes attribute to default sentinel 3550 _inner_classes = Universe::the_empty_short_array(); 3551 // Set nest members attribute to default sentinel 3552 _nest_members = Universe::the_empty_short_array(); 3553 // Set _permitted_subclasses attribute to default sentinel 3554 _permitted_subclasses = Universe::the_empty_short_array(); 3555 // Set _loadable_descriptors attribute to default sentinel 3556 _loadable_descriptors = Universe::the_empty_short_array(); 3557 cfs->guarantee_more(2, CHECK); // attributes_count 3558 u2 attributes_count = cfs->get_u2_fast(); 3559 bool parsed_sourcefile_attribute = false; 3560 bool parsed_innerclasses_attribute = false; 3561 bool parsed_nest_members_attribute = false; 3562 bool parsed_permitted_subclasses_attribute = false; 3563 bool parsed_loadable_descriptors_attribute = false; 3564 bool parsed_nest_host_attribute = false; 3565 bool parsed_record_attribute = false; 3566 bool parsed_enclosingmethod_attribute = false; 3567 bool parsed_bootstrap_methods_attribute = false; 3568 const u1* runtime_visible_annotations = nullptr; 3569 int runtime_visible_annotations_length = 0; 3570 const u1* runtime_visible_type_annotations = nullptr; 3571 int runtime_visible_type_annotations_length = 0; 3572 bool runtime_invisible_type_annotations_exists = false; 3573 bool runtime_invisible_annotations_exists = false; 3574 bool parsed_source_debug_ext_annotations_exist = false; 3575 const u1* inner_classes_attribute_start = nullptr; 3576 u4 inner_classes_attribute_length = 0; 3577 u2 enclosing_method_class_index = 0; 3578 u2 enclosing_method_method_index = 0; 3579 const u1* nest_members_attribute_start = nullptr; 3580 u4 nest_members_attribute_length = 0; 3581 const u1* record_attribute_start = nullptr; 3582 u4 record_attribute_length = 0; 3583 const u1* permitted_subclasses_attribute_start = nullptr; 3584 u4 permitted_subclasses_attribute_length = 0; 3585 const u1* loadable_descriptors_attribute_start = nullptr; 3586 u4 loadable_descriptors_attribute_length = 0; 3587 3588 // Iterate over attributes 3589 while (attributes_count--) { 3590 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3591 const u2 attribute_name_index = cfs->get_u2_fast(); 3592 const u4 attribute_length = cfs->get_u4_fast(); 3593 guarantee_property( 3594 valid_symbol_at(attribute_name_index), 3595 "Attribute name has bad constant pool index %u in class file %s", 3596 attribute_name_index, CHECK); 3597 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3598 if (tag == vmSymbols::tag_source_file()) { 3599 // Check for SourceFile tag 3600 if (_need_verify) { 3601 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3602 } 3603 if (parsed_sourcefile_attribute) { 3604 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD); 3605 return; 3606 } else { 3607 parsed_sourcefile_attribute = true; 3608 } 3609 parse_classfile_sourcefile_attribute(cfs, CHECK); 3610 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3611 // Check for SourceDebugExtension tag 3612 if (parsed_source_debug_ext_annotations_exist) { 3613 classfile_parse_error( 3614 "Multiple SourceDebugExtension attributes in class file %s", THREAD); 3615 return; 3616 } 3617 parsed_source_debug_ext_annotations_exist = true; 3618 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3619 } else if (tag == vmSymbols::tag_inner_classes()) { 3620 // Check for InnerClasses tag 3621 if (parsed_innerclasses_attribute) { 3622 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD); 3623 return; 3624 } else { 3625 parsed_innerclasses_attribute = true; 3626 } 3627 inner_classes_attribute_start = cfs->current(); 3628 inner_classes_attribute_length = attribute_length; 3629 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3630 } else if (tag == vmSymbols::tag_synthetic()) { 3631 // Check for Synthetic tag 3632 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3633 if (attribute_length != 0) { 3634 classfile_parse_error( 3635 "Invalid Synthetic classfile attribute length %u in class file %s", 3636 attribute_length, THREAD); 3637 return; 3638 } 3639 parse_classfile_synthetic_attribute(); 3640 } else if (tag == vmSymbols::tag_deprecated()) { 3641 // Check for Deprecated tag - 4276120 3642 if (attribute_length != 0) { 3643 classfile_parse_error( 3644 "Invalid Deprecated classfile attribute length %u in class file %s", 3645 attribute_length, THREAD); 3646 return; 3647 } 3648 } else if (_major_version >= JAVA_1_5_VERSION) { 3649 if (tag == vmSymbols::tag_signature()) { 3650 if (_generic_signature_index != 0) { 3651 classfile_parse_error( 3652 "Multiple Signature attributes in class file %s", THREAD); 3653 return; 3654 } 3655 if (attribute_length != 2) { 3656 classfile_parse_error( 3657 "Wrong Signature attribute length %u in class file %s", 3658 attribute_length, THREAD); 3659 return; 3660 } 3661 parse_classfile_signature_attribute(cfs, CHECK); 3662 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3663 if (runtime_visible_annotations != nullptr) { 3664 classfile_parse_error( 3665 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD); 3666 return; 3667 } 3668 runtime_visible_annotations_length = attribute_length; 3669 runtime_visible_annotations = cfs->current(); 3670 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 3671 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3672 parse_annotations(cp, 3673 runtime_visible_annotations, 3674 runtime_visible_annotations_length, 3675 parsed_annotations, 3676 _loader_data, 3677 _can_access_vm_annotations); 3678 cfs->skip_u1_fast(runtime_visible_annotations_length); 3679 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3680 if (runtime_invisible_annotations_exists) { 3681 classfile_parse_error( 3682 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD); 3683 return; 3684 } 3685 runtime_invisible_annotations_exists = true; 3686 cfs->skip_u1(attribute_length, CHECK); 3687 } else if (tag == vmSymbols::tag_enclosing_method()) { 3688 if (parsed_enclosingmethod_attribute) { 3689 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD); 3690 return; 3691 } else { 3692 parsed_enclosingmethod_attribute = true; 3693 } 3694 guarantee_property(attribute_length == 4, 3695 "Wrong EnclosingMethod attribute length %u in class file %s", 3696 attribute_length, CHECK); 3697 cfs->guarantee_more(4, CHECK); // class_index, method_index 3698 enclosing_method_class_index = cfs->get_u2_fast(); 3699 enclosing_method_method_index = cfs->get_u2_fast(); 3700 if (enclosing_method_class_index == 0) { 3701 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD); 3702 return; 3703 } 3704 // Validate the constant pool indices and types 3705 guarantee_property(valid_klass_reference_at(enclosing_method_class_index), 3706 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3707 if (enclosing_method_method_index != 0 && 3708 (!cp->is_within_bounds(enclosing_method_method_index) || 3709 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3710 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD); 3711 return; 3712 } 3713 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3714 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3715 if (parsed_bootstrap_methods_attribute) { 3716 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD); 3717 return; 3718 } 3719 parsed_bootstrap_methods_attribute = true; 3720 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3721 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3722 if (runtime_visible_type_annotations != nullptr) { 3723 classfile_parse_error( 3724 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD); 3725 return; 3726 } 3727 runtime_visible_type_annotations_length = attribute_length; 3728 runtime_visible_type_annotations = cfs->current(); 3729 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 3730 // No need for the VM to parse Type annotations 3731 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3732 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3733 if (runtime_invisible_type_annotations_exists) { 3734 classfile_parse_error( 3735 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD); 3736 return; 3737 } 3738 runtime_invisible_type_annotations_exists = true; 3739 cfs->skip_u1(attribute_length, CHECK); 3740 } else if (_major_version >= JAVA_11_VERSION) { 3741 if (tag == vmSymbols::tag_nest_members()) { 3742 // Check for NestMembers tag 3743 if (parsed_nest_members_attribute) { 3744 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD); 3745 return; 3746 } else { 3747 parsed_nest_members_attribute = true; 3748 } 3749 if (parsed_nest_host_attribute) { 3750 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD); 3751 return; 3752 } 3753 nest_members_attribute_start = cfs->current(); 3754 nest_members_attribute_length = attribute_length; 3755 cfs->skip_u1(nest_members_attribute_length, CHECK); 3756 } else if (tag == vmSymbols::tag_nest_host()) { 3757 if (parsed_nest_host_attribute) { 3758 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD); 3759 return; 3760 } else { 3761 parsed_nest_host_attribute = true; 3762 } 3763 if (parsed_nest_members_attribute) { 3764 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD); 3765 return; 3766 } 3767 if (_need_verify) { 3768 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3769 } 3770 cfs->guarantee_more(2, CHECK); 3771 u2 class_info_index = cfs->get_u2_fast(); 3772 guarantee_property( 3773 valid_klass_reference_at(class_info_index), 3774 "Nest-host class_info_index %u has bad constant type in class file %s", 3775 class_info_index, CHECK); 3776 _nest_host = class_info_index; 3777 3778 } else if (_major_version >= JAVA_16_VERSION) { 3779 if (tag == vmSymbols::tag_record()) { 3780 if (parsed_record_attribute) { 3781 classfile_parse_error("Multiple Record attributes in class file %s", THREAD); 3782 return; 3783 } 3784 parsed_record_attribute = true; 3785 record_attribute_start = cfs->current(); 3786 record_attribute_length = attribute_length; 3787 } else if (_major_version >= JAVA_17_VERSION) { 3788 if (tag == vmSymbols::tag_permitted_subclasses()) { 3789 if (parsed_permitted_subclasses_attribute) { 3790 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK); 3791 return; 3792 } 3793 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute. 3794 if (_access_flags.is_final()) { 3795 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK); 3796 return; 3797 } 3798 parsed_permitted_subclasses_attribute = true; 3799 permitted_subclasses_attribute_start = cfs->current(); 3800 permitted_subclasses_attribute_length = attribute_length; 3801 } 3802 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) { 3803 if (parsed_loadable_descriptors_attribute) { 3804 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK); 3805 return; 3806 } 3807 parsed_loadable_descriptors_attribute = true; 3808 loadable_descriptors_attribute_start = cfs->current(); 3809 loadable_descriptors_attribute_length = attribute_length; 3810 } 3811 } 3812 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION 3813 cfs->skip_u1(attribute_length, CHECK); 3814 } else { 3815 // Unknown attribute 3816 cfs->skip_u1(attribute_length, CHECK); 3817 } 3818 } else { 3819 // Unknown attribute 3820 cfs->skip_u1(attribute_length, CHECK); 3821 } 3822 } else { 3823 // Unknown attribute 3824 cfs->skip_u1(attribute_length, CHECK); 3825 } 3826 } 3827 _class_annotations = allocate_annotations(runtime_visible_annotations, 3828 runtime_visible_annotations_length, 3829 CHECK); 3830 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations, 3831 runtime_visible_type_annotations_length, 3832 CHECK); 3833 3834 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3835 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3836 cfs, 3837 cp, 3838 inner_classes_attribute_start, 3839 parsed_innerclasses_attribute, 3840 enclosing_method_class_index, 3841 enclosing_method_method_index, 3842 CHECK); 3843 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3844 guarantee_property( 3845 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3846 "Wrong InnerClasses attribute length in class file %s", CHECK); 3847 } 3848 } 3849 3850 if (parsed_nest_members_attribute) { 3851 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3852 cfs, 3853 nest_members_attribute_start, 3854 CHECK); 3855 if (_need_verify) { 3856 guarantee_property( 3857 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3858 "Wrong NestMembers attribute length in class file %s", CHECK); 3859 } 3860 } 3861 3862 if (parsed_record_attribute) { 3863 const unsigned int calculated_attr_length = parse_classfile_record_attribute( 3864 cfs, 3865 cp, 3866 record_attribute_start, 3867 CHECK); 3868 if (_need_verify) { 3869 guarantee_property(record_attribute_length == calculated_attr_length, 3870 "Record attribute has wrong length in class file %s", 3871 CHECK); 3872 } 3873 } 3874 3875 if (parsed_permitted_subclasses_attribute) { 3876 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute( 3877 cfs, 3878 permitted_subclasses_attribute_start, 3879 CHECK); 3880 if (_need_verify) { 3881 guarantee_property( 3882 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses, 3883 "Wrong PermittedSubclasses attribute length in class file %s", CHECK); 3884 } 3885 } 3886 3887 if (parsed_loadable_descriptors_attribute) { 3888 const u2 num_classes = parse_classfile_loadable_descriptors_attribute( 3889 cfs, 3890 loadable_descriptors_attribute_start, 3891 CHECK); 3892 if (_need_verify) { 3893 guarantee_property( 3894 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes, 3895 "Wrong LoadableDescriptors attribute length in class file %s", CHECK); 3896 } 3897 } 3898 3899 if (_max_bootstrap_specifier_index >= 0) { 3900 guarantee_property(parsed_bootstrap_methods_attribute, 3901 "Missing BootstrapMethods attribute in class file %s", CHECK); 3902 } 3903 } 3904 3905 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3906 assert(k != nullptr, "invariant"); 3907 3908 if (_synthetic_flag) 3909 k->set_is_synthetic(); 3910 if (_sourcefile_index != 0) { 3911 k->set_source_file_name_index(_sourcefile_index); 3912 } 3913 if (_generic_signature_index != 0) { 3914 k->set_generic_signature_index(_generic_signature_index); 3915 } 3916 if (_sde_buffer != nullptr) { 3917 k->set_source_debug_extension(_sde_buffer, _sde_length); 3918 } 3919 } 3920 3921 // Create the Annotations object that will 3922 // hold the annotations array for the Klass. 3923 void ClassFileParser::create_combined_annotations(TRAPS) { 3924 if (_class_annotations == nullptr && 3925 _class_type_annotations == nullptr && 3926 _fields_annotations == nullptr && 3927 _fields_type_annotations == nullptr) { 3928 // Don't create the Annotations object unnecessarily. 3929 return; 3930 } 3931 3932 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3933 annotations->set_class_annotations(_class_annotations); 3934 annotations->set_class_type_annotations(_class_type_annotations); 3935 annotations->set_fields_annotations(_fields_annotations); 3936 annotations->set_fields_type_annotations(_fields_type_annotations); 3937 3938 // This is the Annotations object that will be 3939 // assigned to InstanceKlass being constructed. 3940 _combined_annotations = annotations; 3941 3942 // The annotations arrays below has been transferred the 3943 // _combined_annotations so these fields can now be cleared. 3944 _class_annotations = nullptr; 3945 _class_type_annotations = nullptr; 3946 _fields_annotations = nullptr; 3947 _fields_type_annotations = nullptr; 3948 } 3949 3950 // Transfer ownership of metadata allocated to the InstanceKlass. 3951 void ClassFileParser::apply_parsed_class_metadata( 3952 InstanceKlass* this_klass, 3953 int java_fields_count) { 3954 assert(this_klass != nullptr, "invariant"); 3955 3956 _cp->set_pool_holder(this_klass); 3957 this_klass->set_constants(_cp); 3958 this_klass->set_fieldinfo_stream(_fieldinfo_stream); 3959 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table); 3960 this_klass->set_fields_status(_fields_status); 3961 this_klass->set_methods(_methods); 3962 this_klass->set_inner_classes(_inner_classes); 3963 this_klass->set_nest_members(_nest_members); 3964 this_klass->set_nest_host_index(_nest_host); 3965 this_klass->set_loadable_descriptors(_loadable_descriptors); 3966 this_klass->set_annotations(_combined_annotations); 3967 this_klass->set_permitted_subclasses(_permitted_subclasses); 3968 this_klass->set_record_components(_record_components); 3969 this_klass->set_inline_layout_info_array(_inline_layout_info_array); 3970 3971 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table)); 3972 3973 // Delay the setting of _local_interfaces and _transitive_interfaces until after 3974 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could 3975 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with 3976 // its _super. If an OOM occurs while loading the current klass, its _super field 3977 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3978 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3979 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3980 3981 // Clear out these fields so they don't get deallocated by the destructor 3982 clear_class_metadata(); 3983 } 3984 3985 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno, 3986 int anno_length, 3987 TRAPS) { 3988 AnnotationArray* annotations = nullptr; 3989 if (anno != nullptr) { 3990 annotations = MetadataFactory::new_array<u1>(_loader_data, 3991 anno_length, 3992 CHECK_(annotations)); 3993 for (int i = 0; i < anno_length; i++) { 3994 annotations->at_put(i, anno[i]); 3995 } 3996 } 3997 return annotations; 3998 } 3999 4000 void ClassFileParser::check_super_class(ConstantPool* const cp, 4001 const int super_class_index, 4002 const bool need_verify, 4003 TRAPS) { 4004 assert(cp != nullptr, "invariant"); 4005 4006 if (super_class_index == 0) { 4007 guarantee_property(_class_name == vmSymbols::java_lang_Object(), 4008 "Invalid superclass index 0 in class file %s", 4009 CHECK); 4010 } else { 4011 guarantee_property(valid_klass_reference_at(super_class_index), 4012 "Invalid superclass index %u in class file %s", 4013 super_class_index, 4014 CHECK); 4015 4016 // The class name should be legal because it is checked when parsing constant pool. 4017 // However, make sure it is not an array type. 4018 if (need_verify) { 4019 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY, 4020 "Bad superclass name in class file %s", CHECK); 4021 } 4022 } 4023 } 4024 4025 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) { 4026 _max_nonstatic_oop_maps = max_blocks; 4027 _nonstatic_oop_map_count = 0; 4028 if (max_blocks == 0) { 4029 _nonstatic_oop_maps = nullptr; 4030 } else { 4031 _nonstatic_oop_maps = 4032 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps); 4033 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); 4034 } 4035 } 4036 4037 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const { 4038 assert(_nonstatic_oop_map_count > 0, "Has no oop maps"); 4039 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1); 4040 } 4041 4042 // addition of super oop maps 4043 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { 4044 assert(nof_blocks && _nonstatic_oop_map_count == 0 && 4045 nof_blocks <= _max_nonstatic_oop_maps, "invariant"); 4046 4047 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); 4048 _nonstatic_oop_map_count += nof_blocks; 4049 } 4050 4051 // collection of oops 4052 void OopMapBlocksBuilder::add(int offset, int count) { 4053 if (_nonstatic_oop_map_count == 0) { 4054 _nonstatic_oop_map_count++; 4055 } 4056 OopMapBlock* nonstatic_oop_map = last_oop_map(); 4057 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up 4058 nonstatic_oop_map->set_offset(offset); 4059 nonstatic_oop_map->set_count(count); 4060 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add 4061 nonstatic_oop_map->increment_count(count); 4062 } else { // Need a new one... 4063 _nonstatic_oop_map_count++; 4064 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check"); 4065 nonstatic_oop_map = last_oop_map(); 4066 nonstatic_oop_map->set_offset(offset); 4067 nonstatic_oop_map->set_count(count); 4068 } 4069 } 4070 4071 // general purpose copy, e.g. into allocated instanceKlass 4072 void OopMapBlocksBuilder::copy(OopMapBlock* dst) { 4073 if (_nonstatic_oop_map_count != 0) { 4074 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count); 4075 } 4076 } 4077 4078 // Sort and compact adjacent blocks 4079 void OopMapBlocksBuilder::compact() { 4080 if (_nonstatic_oop_map_count <= 1) { 4081 return; 4082 } 4083 /* 4084 * Since field layout sneaks in oops before values, we will be able to condense 4085 * blocks. There is potential to compact between super, own refs and values 4086 * containing refs. 4087 * 4088 * Currently compaction is slightly limited due to values being 8 byte aligned. 4089 * This may well change: FixMe if it doesn't, the code below is fairly general purpose 4090 * and maybe it doesn't need to be. 4091 */ 4092 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock), 4093 (_sort_Fn)OopMapBlock::compare_offset); 4094 if (_nonstatic_oop_map_count < 2) { 4095 return; 4096 } 4097 4098 // Make a temp copy, and iterate through and copy back into the original 4099 ResourceMark rm; 4100 OopMapBlock* oop_maps_copy = 4101 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count); 4102 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count; 4103 copy(oop_maps_copy); 4104 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps; 4105 unsigned int new_count = 1; 4106 oop_maps_copy++; 4107 while(oop_maps_copy < oop_maps_copy_end) { 4108 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); 4109 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { 4110 nonstatic_oop_map->increment_count(oop_maps_copy->count()); 4111 } else { 4112 nonstatic_oop_map++; 4113 new_count++; 4114 nonstatic_oop_map->set_offset(oop_maps_copy->offset()); 4115 nonstatic_oop_map->set_count(oop_maps_copy->count()); 4116 } 4117 oop_maps_copy++; 4118 } 4119 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?"); 4120 _nonstatic_oop_map_count = new_count; 4121 } 4122 4123 void OopMapBlocksBuilder::print_on(outputStream* st) const { 4124 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps); 4125 if (_nonstatic_oop_map_count > 0) { 4126 OopMapBlock* map = _nonstatic_oop_maps; 4127 OopMapBlock* last_map = last_oop_map(); 4128 assert(map <= last_map, "Last less than first"); 4129 while (map <= last_map) { 4130 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), 4131 map->offset() + map->offset_span() - heapOopSize, map->count()); 4132 map++; 4133 } 4134 } 4135 } 4136 4137 void OopMapBlocksBuilder::print_value_on(outputStream* st) const { 4138 print_on(st); 4139 } 4140 4141 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4142 assert(ik != nullptr, "invariant"); 4143 4144 const InstanceKlass* const super = ik->super(); 4145 4146 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4147 // in which case we don't have to register objects as finalizable 4148 if (!_has_empty_finalizer) { 4149 if (_has_finalizer || 4150 (super != nullptr && super->has_finalizer())) { 4151 ik->set_has_finalizer(); 4152 } 4153 } 4154 4155 #ifdef ASSERT 4156 bool f = false; 4157 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4158 vmSymbols::void_method_signature()); 4159 if (InstanceKlass::is_finalization_enabled() && 4160 (m != nullptr) && !m->is_empty_method()) { 4161 f = true; 4162 } 4163 4164 // Spec doesn't prevent agent from redefinition of empty finalizer. 4165 // Despite the fact that it's generally bad idea and redefined finalizer 4166 // will not work as expected we shouldn't abort vm in this case 4167 if (!ik->has_redefined_this_or_super()) { 4168 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4169 } 4170 #endif 4171 4172 // Check if this klass supports the java.lang.Cloneable interface 4173 if (vmClasses::Cloneable_klass_is_loaded()) { 4174 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) { 4175 ik->set_is_cloneable(); 4176 } 4177 } 4178 4179 // If it cannot be fast-path allocated, set a bit in the layout helper. 4180 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4181 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4182 if (ik->is_abstract() || ik->is_interface() 4183 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr) 4184 || ik->size_helper() >= FastAllocateSizeLimit) { 4185 // Forbid fast-path allocation. 4186 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4187 ik->set_layout_helper(lh); 4188 } 4189 4190 // Propagate the AOT runtimeSetup method discovery 4191 if (_has_aot_runtime_setup_method) { 4192 ik->set_is_runtime_setup_required(); 4193 if (log_is_enabled(Info, aot, init)) { 4194 ResourceMark rm; 4195 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name()); 4196 } 4197 } 4198 } 4199 4200 bool ClassFileParser::supports_inline_types() const { 4201 // Inline types are only supported by class file version 71.65535 and later 4202 return _major_version > JAVA_27_VERSION || 4203 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION); 4204 } 4205 4206 // utility methods for appending an array with check for duplicates 4207 4208 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4209 const Array<InstanceKlass*>* const ifs) { 4210 // iterate over new interfaces 4211 for (int i = 0; i < ifs->length(); i++) { 4212 InstanceKlass* const e = ifs->at(i); 4213 assert(e->is_klass() && e->is_interface(), "just checking"); 4214 // add new interface 4215 result->append_if_missing(e); 4216 } 4217 } 4218 4219 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4220 Array<InstanceKlass*>* local_ifs, 4221 ClassLoaderData* loader_data, 4222 TRAPS) { 4223 assert(local_ifs != nullptr, "invariant"); 4224 assert(loader_data != nullptr, "invariant"); 4225 4226 // Compute maximum size for transitive interfaces 4227 int max_transitive_size = 0; 4228 int super_size = 0; 4229 // Add superclass transitive interfaces size 4230 if (super != nullptr) { 4231 super_size = super->transitive_interfaces()->length(); 4232 max_transitive_size += super_size; 4233 } 4234 // Add local interfaces' super interfaces 4235 const int local_size = local_ifs->length(); 4236 for (int i = 0; i < local_size; i++) { 4237 InstanceKlass* const l = local_ifs->at(i); 4238 max_transitive_size += l->transitive_interfaces()->length(); 4239 } 4240 // Finally add local interfaces 4241 max_transitive_size += local_size; 4242 // Construct array 4243 if (max_transitive_size == 0) { 4244 // no interfaces, use canonicalized array 4245 return Universe::the_empty_instance_klass_array(); 4246 } else if (max_transitive_size == super_size) { 4247 // no new local interfaces added, share superklass' transitive interface array 4248 return super->transitive_interfaces(); 4249 // The three lines below are commented to work around bug JDK-8245487 4250 // } else if (max_transitive_size == local_size) { 4251 // // only local interfaces added, share local interface array 4252 // return local_ifs; 4253 } else { 4254 ResourceMark rm; 4255 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4256 4257 // Copy down from superclass 4258 if (super != nullptr) { 4259 append_interfaces(result, super->transitive_interfaces()); 4260 } 4261 4262 // Copy down from local interfaces' superinterfaces 4263 for (int i = 0; i < local_size; i++) { 4264 InstanceKlass* const l = local_ifs->at(i); 4265 append_interfaces(result, l->transitive_interfaces()); 4266 } 4267 // Finally add local interfaces 4268 append_interfaces(result, local_ifs); 4269 4270 // length will be less than the max_transitive_size if duplicates were removed 4271 const int length = result->length(); 4272 assert(length <= max_transitive_size, "just checking"); 4273 4274 Array<InstanceKlass*>* const new_result = 4275 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4276 for (int i = 0; i < length; i++) { 4277 InstanceKlass* const e = result->at(i); 4278 assert(e != nullptr, "just checking"); 4279 new_result->at_put(i, e); 4280 } 4281 return new_result; 4282 } 4283 } 4284 4285 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4286 assert(this_klass != nullptr, "invariant"); 4287 const InstanceKlass* const super = this_klass->super(); 4288 4289 if (super != nullptr) { 4290 if (super->is_final()) { 4291 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD); 4292 return; 4293 } 4294 4295 if (super->is_sealed()) { 4296 stringStream ss; 4297 ResourceMark rm(THREAD); 4298 if (!super->has_as_permitted_subclass(this_klass, ss)) { 4299 classfile_icce_error(ss.as_string(), THREAD); 4300 return; 4301 } 4302 } 4303 4304 // The JVMS says that super classes for value types must not have the ACC_IDENTITY 4305 // flag set. But, java.lang.Object must still be allowed to be a direct super class 4306 // for a value classes. So, it is treated as a special case for now. 4307 if (!this_klass->access_flags().is_identity_class() && 4308 super->name() != vmSymbols::java_lang_Object() && 4309 super->is_identity_class()) { 4310 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD); 4311 return; 4312 } 4313 4314 Reflection::VerifyClassAccessResults vca_result = 4315 Reflection::verify_class_access(this_klass, super, false); 4316 if (vca_result != Reflection::ACCESS_OK) { 4317 ResourceMark rm(THREAD); 4318 char* msg = Reflection::verify_class_access_msg(this_klass, 4319 super, 4320 vca_result); 4321 4322 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4323 if (msg == nullptr) { 4324 bool same_module = (this_klass->module() == super->module()); 4325 Exceptions::fthrow( 4326 THREAD_AND_LOCATION, 4327 vmSymbols::java_lang_IllegalAccessError(), 4328 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4329 this_klass->external_name(), 4330 super->is_abstract() ? "abstract " : "", 4331 super->external_name(), 4332 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4333 (same_module) ? "" : "; ", 4334 (same_module) ? "" : super->class_in_module_of_loader()); 4335 } else { 4336 // Add additional message content. 4337 Exceptions::fthrow( 4338 THREAD_AND_LOCATION, 4339 vmSymbols::java_lang_IllegalAccessError(), 4340 "superclass access check failed: %s", 4341 msg); 4342 } 4343 } 4344 } 4345 } 4346 4347 4348 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4349 assert(this_klass != nullptr, "invariant"); 4350 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4351 const int lng = local_interfaces->length(); 4352 for (int i = lng - 1; i >= 0; i--) { 4353 InstanceKlass* const k = local_interfaces->at(i); 4354 assert (k != nullptr && k->is_interface(), "invalid interface"); 4355 4356 if (k->is_sealed()) { 4357 stringStream ss; 4358 ResourceMark rm(THREAD); 4359 if (!k->has_as_permitted_subclass(this_klass, ss)) { 4360 classfile_icce_error(ss.as_string(), THREAD); 4361 return; 4362 } 4363 } 4364 4365 Reflection::VerifyClassAccessResults vca_result = 4366 Reflection::verify_class_access(this_klass, k, false); 4367 if (vca_result != Reflection::ACCESS_OK) { 4368 ResourceMark rm(THREAD); 4369 char* msg = Reflection::verify_class_access_msg(this_klass, 4370 k, 4371 vca_result); 4372 4373 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4374 if (msg == nullptr) { 4375 bool same_module = (this_klass->module() == k->module()); 4376 Exceptions::fthrow( 4377 THREAD_AND_LOCATION, 4378 vmSymbols::java_lang_IllegalAccessError(), 4379 "class %s cannot access its superinterface %s (%s%s%s)", 4380 this_klass->external_name(), 4381 k->external_name(), 4382 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4383 (same_module) ? "" : "; ", 4384 (same_module) ? "" : k->class_in_module_of_loader()); 4385 return; 4386 } else { 4387 // Add additional message content. 4388 Exceptions::fthrow( 4389 THREAD_AND_LOCATION, 4390 vmSymbols::java_lang_IllegalAccessError(), 4391 "superinterface check failed: %s", 4392 msg); 4393 return; 4394 } 4395 } 4396 } 4397 } 4398 4399 4400 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4401 assert(this_klass != nullptr, "invariant"); 4402 const Array<Method*>* const methods = this_klass->methods(); 4403 const int num_methods = methods->length(); 4404 4405 // go thru each method and check if it overrides a final method 4406 for (int index = 0; index < num_methods; index++) { 4407 const Method* const m = methods->at(index); 4408 4409 // skip private, static, and <init> methods 4410 if ((!m->is_private() && !m->is_static()) && 4411 (m->name() != vmSymbols::object_initializer_name())) { 4412 4413 const Symbol* const name = m->name(); 4414 const Symbol* const signature = m->signature(); 4415 const InstanceKlass* k = this_klass->super(); 4416 const Method* super_m = nullptr; 4417 while (k != nullptr) { 4418 // skip supers that don't have final methods. 4419 if (k->has_final_method()) { 4420 // lookup a matching method in the super class hierarchy 4421 super_m = k->lookup_method(name, signature); 4422 if (super_m == nullptr) { 4423 break; // didn't find any match; get out 4424 } 4425 4426 if (super_m->is_final() && !super_m->is_static() && 4427 !super_m->access_flags().is_private()) { 4428 // matching method in super is final, and not static or private 4429 bool can_access = Reflection::verify_member_access(this_klass, 4430 super_m->method_holder(), 4431 super_m->method_holder(), 4432 super_m->access_flags(), 4433 false, false, CHECK); 4434 if (can_access) { 4435 // this class can access super final method and therefore override 4436 ResourceMark rm(THREAD); 4437 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 4438 err_msg("class %s overrides final method %s.%s%s", 4439 this_klass->external_name(), 4440 super_m->method_holder()->external_name(), 4441 name->as_C_string(), 4442 signature->as_C_string())); 4443 } 4444 } 4445 4446 // continue to look from super_m's holder's super. 4447 k = super_m->method_holder()->super(); 4448 continue; 4449 } 4450 4451 k = k->super(); 4452 } 4453 } 4454 } 4455 } 4456 4457 4458 // assumes that this_klass is an interface 4459 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4460 assert(this_klass != nullptr, "invariant"); 4461 assert(this_klass->is_interface(), "not an interface"); 4462 const Array<Method*>* methods = this_klass->methods(); 4463 const int num_methods = methods->length(); 4464 4465 for (int index = 0; index < num_methods; index++) { 4466 const Method* const m = methods->at(index); 4467 // if m is static and not the init method, throw a verify error 4468 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4469 ResourceMark rm(THREAD); 4470 4471 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4472 Exceptions::fthrow( 4473 THREAD_AND_LOCATION, 4474 vmSymbols::java_lang_VerifyError(), 4475 "Illegal static method %s in interface %s", 4476 m->name()->as_C_string(), 4477 this_klass->external_name() 4478 ); 4479 return; 4480 } 4481 } 4482 } 4483 4484 // utility methods for format checking 4485 4486 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null. 4487 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const { 4488 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4489 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4490 if (is_module) { 4491 ResourceMark rm(THREAD); 4492 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4493 Exceptions::fthrow( 4494 THREAD_AND_LOCATION, 4495 vmSymbols::java_lang_NoClassDefFoundError(), 4496 "%s is not a class because access_flag ACC_MODULE is set", 4497 _class_name->as_C_string()); 4498 return; 4499 } 4500 4501 if (!_need_verify) { return; } 4502 4503 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4504 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4505 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4506 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0; 4507 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4508 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4509 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4510 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final)); 4511 4512 if ((is_abstract && is_final) || 4513 (is_interface && !is_abstract) || 4514 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces 4515 (!is_interface && major_gte_1_5 && is_annotation) || 4516 (!valid_value_class)) { 4517 ResourceMark rm(THREAD); 4518 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4519 if (inner_name == nullptr && !is_anonymous_inner_class) { 4520 Exceptions::fthrow( 4521 THREAD_AND_LOCATION, 4522 vmSymbols::java_lang_ClassFormatError(), 4523 "Illegal class modifiers in class %s: 0x%X", 4524 _class_name->as_C_string(), flags 4525 ); 4526 } else { 4527 if (is_anonymous_inner_class) { 4528 Exceptions::fthrow( 4529 THREAD_AND_LOCATION, 4530 vmSymbols::java_lang_ClassFormatError(), 4531 "Illegal class modifiers in anonymous inner class of class %s: 0x%X", 4532 _class_name->as_C_string(), flags 4533 ); 4534 } else { 4535 Exceptions::fthrow( 4536 THREAD_AND_LOCATION, 4537 vmSymbols::java_lang_ClassFormatError(), 4538 "Illegal class modifiers in inner class %s of class %s: 0x%X", 4539 inner_name->as_C_string(), _class_name->as_C_string(), flags 4540 ); 4541 } 4542 } 4543 return; 4544 } 4545 } 4546 4547 static bool has_illegal_visibility(jint flags) { 4548 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4549 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4550 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4551 4552 return ((is_public && is_protected) || 4553 (is_public && is_private) || 4554 (is_protected && is_private)); 4555 } 4556 4557 // A legal major_version.minor_version must be one of the following: 4558 // 4559 // Major_version >= 45 and major_version < 56, any minor_version. 4560 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. 4561 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. 4562 // 4563 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4564 ResourceMark rm(THREAD); 4565 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4566 if (major < JAVA_MIN_SUPPORTED_VERSION) { 4567 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version", 4568 class_name, major, minor, THREAD); 4569 return; 4570 } 4571 4572 if (major > max_version) { 4573 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4574 Exceptions::fthrow( 4575 THREAD_AND_LOCATION, 4576 vmSymbols::java_lang_UnsupportedClassVersionError(), 4577 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4578 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4579 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4580 return; 4581 } 4582 4583 if (major < JAVA_12_VERSION || minor == 0) { 4584 return; 4585 } 4586 4587 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4588 if (major != max_version) { 4589 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4590 Exceptions::fthrow( 4591 THREAD_AND_LOCATION, 4592 vmSymbols::java_lang_UnsupportedClassVersionError(), 4593 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4594 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4595 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4596 return; 4597 } 4598 4599 if (!Arguments::enable_preview()) { 4600 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4601 class_name, major, minor, THREAD); 4602 return; 4603 } 4604 4605 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4606 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4607 class_name, major, minor, THREAD); 4608 } 4609 } 4610 4611 void ClassFileParser:: verify_legal_field_modifiers(jint flags, 4612 AccessFlags class_access_flags, 4613 TRAPS) const { 4614 if (!_need_verify) { return; } 4615 4616 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4617 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4618 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4619 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4620 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4621 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4622 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4623 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4624 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0; 4625 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4626 4627 const bool is_interface = class_access_flags.is_interface(); 4628 const bool is_identity_class = class_access_flags.is_identity_class(); 4629 4630 bool is_illegal = false; 4631 const char* error_msg = ""; 4632 4633 // There is some overlap in the checks that apply, for example interface fields 4634 // must be static, static fields can't be strict, and therefore interfaces can't 4635 // have strict fields. So we don't have to check every possible invalid combination 4636 // individually as long as all are covered. Once we have found an illegal combination 4637 // we can stop checking. 4638 4639 if (!is_illegal) { 4640 if (is_interface) { 4641 if (!is_public || !is_static || !is_final || is_private || 4642 is_protected || is_volatile || is_transient || 4643 (major_gte_1_5 && is_enum)) { 4644 is_illegal = true; 4645 error_msg = "interface fields must be public, static and final, and may be synthetic"; 4646 } 4647 } else { // not interface 4648 if (has_illegal_visibility(flags)) { 4649 is_illegal = true; 4650 error_msg = "invalid visibility flags for class field"; 4651 } else if (is_final && is_volatile) { 4652 is_illegal = true; 4653 error_msg = "fields cannot be final and volatile"; 4654 } else if (supports_inline_types()) { 4655 if (!is_identity_class && !is_static && (!is_strict || !is_final)) { 4656 is_illegal = true; 4657 error_msg = "value class fields must be either non-static final and strict, or static"; 4658 } 4659 } 4660 } 4661 } 4662 4663 if (is_illegal) { 4664 ResourceMark rm(THREAD); 4665 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4666 Exceptions::fthrow( 4667 THREAD_AND_LOCATION, 4668 vmSymbols::java_lang_ClassFormatError(), 4669 "Illegal field modifiers (%s) in class %s: 0x%X", 4670 error_msg, _class_name->as_C_string(), flags); 4671 return; 4672 } 4673 } 4674 4675 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4676 AccessFlags class_access_flags, 4677 const Symbol* name, 4678 TRAPS) const { 4679 if (!_need_verify) { return; } 4680 4681 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4682 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4683 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4684 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4685 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4686 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4687 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4688 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4689 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4690 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4691 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4692 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4693 const bool major_gte_17 = _major_version >= JAVA_17_VERSION; 4694 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4695 // LW401 CR required: removal of value factories support 4696 const bool is_interface = class_access_flags.is_interface(); 4697 const bool is_identity_class = class_access_flags.is_identity_class(); 4698 const bool is_abstract_class = class_access_flags.is_abstract(); 4699 4700 bool is_illegal = false; 4701 4702 const char* class_note = ""; 4703 if (is_interface) { 4704 if (major_gte_8) { 4705 // Class file version is JAVA_8_VERSION or later Methods of 4706 // interfaces may set any of the flags except ACC_PROTECTED, 4707 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4708 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4709 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4710 (is_native || is_protected || is_final || is_synchronized) || 4711 // If a specific method of a class or interface has its 4712 // ACC_ABSTRACT flag set, it must not have any of its 4713 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4714 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4715 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4716 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4717 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) { 4718 is_illegal = true; 4719 } 4720 } else if (major_gte_1_5) { 4721 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4722 if (!is_public || is_private || is_protected || is_static || is_final || 4723 is_synchronized || is_native || !is_abstract || is_strict) { 4724 is_illegal = true; 4725 } 4726 } else { 4727 // Class file version is pre-JAVA_1_5_VERSION 4728 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4729 is_illegal = true; 4730 } 4731 } 4732 } else { // not interface 4733 if (has_illegal_visibility(flags)) { 4734 is_illegal = true; 4735 } else { 4736 if (is_initializer) { 4737 if (is_static || is_final || is_synchronized || is_native || 4738 is_abstract || (major_gte_1_5 && is_bridge)) { 4739 is_illegal = true; 4740 } 4741 } else { // not initializer 4742 if (!is_identity_class && is_synchronized && !is_static) { 4743 is_illegal = true; 4744 class_note = " (not an identity class)"; 4745 } else { 4746 if (is_abstract) { 4747 if ((is_final || is_native || is_private || is_static || 4748 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) { 4749 is_illegal = true; 4750 } 4751 } 4752 } 4753 } 4754 } 4755 } 4756 4757 if (is_illegal) { 4758 ResourceMark rm(THREAD); 4759 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4760 Exceptions::fthrow( 4761 THREAD_AND_LOCATION, 4762 vmSymbols::java_lang_ClassFormatError(), 4763 "Method %s in class %s%s has illegal modifiers: 0x%X", 4764 name->as_C_string(), _class_name->as_C_string(), 4765 class_note, flags); 4766 return; 4767 } 4768 } 4769 4770 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 4771 int length, 4772 TRAPS) const { 4773 assert(_need_verify, "only called when _need_verify is true"); 4774 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP. 4775 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) { 4776 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD); 4777 } 4778 } 4779 4780 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4781 // In class names, '/' separates unqualified names. This is verified in this function also. 4782 // Method names also may not contain the characters '<' or '>', unless <init> 4783 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4784 // method. Because these names have been checked as special cases before 4785 // calling this method in verify_legal_method_name. 4786 // 4787 // This method is also called from the modular system APIs in modules.cpp 4788 // to verify the validity of module and package names. 4789 bool ClassFileParser::verify_unqualified_name(const char* name, 4790 unsigned int length, 4791 int type) { 4792 if (length == 0) return false; // Must have at least one char. 4793 for (const char* p = name; p != name + length; p++) { 4794 switch(*p) { 4795 case JVM_SIGNATURE_DOT: 4796 case JVM_SIGNATURE_ENDCLASS: 4797 case JVM_SIGNATURE_ARRAY: 4798 // do not permit '.', ';', or '[' 4799 return false; 4800 case JVM_SIGNATURE_SLASH: 4801 // check for '//' or leading or trailing '/' which are not legal 4802 // unqualified name must not be empty 4803 if (type == ClassFileParser::LegalClass) { 4804 if (p == name || p+1 >= name+length || 4805 *(p+1) == JVM_SIGNATURE_SLASH) { 4806 return false; 4807 } 4808 } else { 4809 return false; // do not permit '/' unless it's class name 4810 } 4811 break; 4812 case JVM_SIGNATURE_SPECIAL: 4813 case JVM_SIGNATURE_ENDSPECIAL: 4814 // do not permit '<' or '>' in method names 4815 if (type == ClassFileParser::LegalMethod) { 4816 return false; 4817 } 4818 } 4819 } 4820 return true; 4821 } 4822 4823 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) { 4824 if (_loadable_descriptors == nullptr) return false; 4825 for (int i = 0; i < _loadable_descriptors->length(); i++) { 4826 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i)); 4827 if (class_name == klass) return true; 4828 } 4829 return false; 4830 } 4831 4832 // Take pointer to a UTF8 byte string (not NUL-terminated). 4833 // Skip over the longest part of the string that could 4834 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true. 4835 // Return a pointer to just past the fieldname. 4836 // Return null if no fieldname at all was found, or in the case of slash_ok 4837 // being true, we saw consecutive slashes (meaning we were looking for a 4838 // qualified path but found something that was badly-formed). 4839 static const char* skip_over_field_name(const char* const name, 4840 bool slash_ok, 4841 unsigned int length) { 4842 const char* p; 4843 jboolean last_is_slash = false; 4844 jboolean not_first_ch = false; 4845 4846 for (p = name; p != name + length; not_first_ch = true) { 4847 const char* old_p = p; 4848 jchar ch = *p; 4849 if (ch < 128) { 4850 p++; 4851 // quick check for ascii 4852 if ((ch >= 'a' && ch <= 'z') || 4853 (ch >= 'A' && ch <= 'Z') || 4854 (ch == '_' || ch == '$') || 4855 (not_first_ch && ch >= '0' && ch <= '9')) { 4856 last_is_slash = false; 4857 continue; 4858 } 4859 if (slash_ok && ch == JVM_SIGNATURE_SLASH) { 4860 if (last_is_slash) { 4861 return nullptr; // Don't permit consecutive slashes 4862 } 4863 last_is_slash = true; 4864 continue; 4865 } 4866 } 4867 else { 4868 jint unicode_ch; 4869 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4870 p = tmp_p; 4871 last_is_slash = false; 4872 // Check if ch is Java identifier start or is Java identifier part 4873 // 4672820: call java.lang.Character methods directly without generating separate tables. 4874 EXCEPTION_MARK; 4875 // return value 4876 JavaValue result(T_BOOLEAN); 4877 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 4878 JavaCallArguments args; 4879 args.push_int(unicode_ch); 4880 4881 if (not_first_ch) { 4882 // public static boolean isJavaIdentifierPart(char ch); 4883 JavaCalls::call_static(&result, 4884 vmClasses::Character_klass(), 4885 vmSymbols::isJavaIdentifierPart_name(), 4886 vmSymbols::int_bool_signature(), 4887 &args, 4888 THREAD); 4889 } else { 4890 // public static boolean isJavaIdentifierStart(char ch); 4891 JavaCalls::call_static(&result, 4892 vmClasses::Character_klass(), 4893 vmSymbols::isJavaIdentifierStart_name(), 4894 vmSymbols::int_bool_signature(), 4895 &args, 4896 THREAD); 4897 } 4898 if (HAS_PENDING_EXCEPTION) { 4899 CLEAR_PENDING_EXCEPTION; 4900 return nullptr; 4901 } 4902 if(result.get_jboolean()) { 4903 continue; 4904 } 4905 } 4906 return (not_first_ch) ? old_p : nullptr; 4907 } 4908 return (not_first_ch && !last_is_slash) ? p : nullptr; 4909 } 4910 4911 // Take pointer to a UTF8 byte string (not NUL-terminated). 4912 // Skip over the longest part of the string that could 4913 // be taken as a field signature. Allow "void" if void_ok. 4914 // Return a pointer to just past the signature. 4915 // Return null if no legal signature is found. 4916 const char* ClassFileParser::skip_over_field_signature(const char* signature, 4917 bool void_ok, 4918 unsigned int length, 4919 TRAPS) const { 4920 unsigned int array_dim = 0; 4921 while (length > 0) { 4922 switch (signature[0]) { 4923 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; } 4924 case JVM_SIGNATURE_BOOLEAN: 4925 case JVM_SIGNATURE_BYTE: 4926 case JVM_SIGNATURE_CHAR: 4927 case JVM_SIGNATURE_SHORT: 4928 case JVM_SIGNATURE_INT: 4929 case JVM_SIGNATURE_FLOAT: 4930 case JVM_SIGNATURE_LONG: 4931 case JVM_SIGNATURE_DOUBLE: 4932 return signature + 1; 4933 case JVM_SIGNATURE_CLASS: 4934 { 4935 if (_major_version < JAVA_1_5_VERSION) { 4936 signature++; 4937 length--; 4938 // Skip over the class name if one is there 4939 const char* const p = skip_over_field_name(signature, true, length); 4940 assert(p == nullptr || p > signature, "must parse one character at least"); 4941 // The next character better be a semicolon 4942 if (p != nullptr && // Parse of field name succeeded. 4943 p - signature < static_cast<int>(length) && // There is at least one character left to parse. 4944 p[0] == JVM_SIGNATURE_ENDCLASS) { 4945 return p + 1; 4946 } 4947 } 4948 else { 4949 // Skip leading 'L' or 'Q' and ignore first appearance of ';' 4950 signature++; 4951 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); 4952 // Format check signature 4953 if (c != nullptr) { 4954 int newlen = pointer_delta_as_int(c, (char*) signature); 4955 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 4956 if (!legal) { 4957 classfile_parse_error("Class name is empty or contains illegal character " 4958 "in descriptor in class file %s", 4959 THREAD); 4960 return nullptr; 4961 } 4962 return signature + newlen + 1; 4963 } 4964 } 4965 return nullptr; 4966 } 4967 case JVM_SIGNATURE_ARRAY: 4968 array_dim++; 4969 if (array_dim > 255) { 4970 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4971 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD); 4972 return nullptr; 4973 } 4974 // The rest of what's there better be a legal signature 4975 signature++; 4976 length--; 4977 void_ok = false; 4978 break; 4979 default: 4980 return nullptr; 4981 } 4982 } 4983 return nullptr; 4984 } 4985 4986 // Checks if name is a legal class name. 4987 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 4988 if (!_need_verify) { return; } 4989 4990 assert(name->refcount() > 0, "symbol must be kept alive"); 4991 char* bytes = (char*)name->bytes(); 4992 unsigned int length = name->utf8_length(); 4993 bool legal = false; 4994 4995 if (length > 0) { 4996 const char* p; 4997 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4998 p = skip_over_field_signature(bytes, false, length, CHECK); 4999 legal = (p != nullptr) && ((p - bytes) == (int)length); 5000 } else if (_major_version < JAVA_1_5_VERSION) { 5001 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5002 p = skip_over_field_name(bytes, true, length); 5003 legal = (p != nullptr) && ((p - bytes) == (int)length); 5004 } 5005 } else { 5006 // 4900761: relax the constraints based on JSR202 spec 5007 // Class names may be drawn from the entire Unicode character set. 5008 // Identifiers between '/' must be unqualified names. 5009 // The utf8 string has been verified when parsing cpool entries. 5010 legal = verify_unqualified_name(bytes, length, LegalClass); 5011 } 5012 } 5013 if (!legal) { 5014 ResourceMark rm(THREAD); 5015 assert(_class_name != nullptr, "invariant"); 5016 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5017 Exceptions::fthrow( 5018 THREAD_AND_LOCATION, 5019 vmSymbols::java_lang_ClassFormatError(), 5020 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5021 _class_name->as_C_string() 5022 ); 5023 return; 5024 } 5025 } 5026 5027 // Checks if name is a legal field name. 5028 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5029 if (!_need_verify) { return; } 5030 5031 char* bytes = (char*)name->bytes(); 5032 unsigned int length = name->utf8_length(); 5033 bool legal = false; 5034 5035 if (length > 0) { 5036 if (_major_version < JAVA_1_5_VERSION) { 5037 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5038 const char* p = skip_over_field_name(bytes, false, length); 5039 legal = (p != nullptr) && ((p - bytes) == (int)length); 5040 } 5041 } else { 5042 // 4881221: relax the constraints based on JSR202 spec 5043 legal = verify_unqualified_name(bytes, length, LegalField); 5044 } 5045 } 5046 5047 if (!legal) { 5048 ResourceMark rm(THREAD); 5049 assert(_class_name != nullptr, "invariant"); 5050 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5051 Exceptions::fthrow( 5052 THREAD_AND_LOCATION, 5053 vmSymbols::java_lang_ClassFormatError(), 5054 "Illegal field name \"%.*s\" in class %s", length, bytes, 5055 _class_name->as_C_string() 5056 ); 5057 return; 5058 } 5059 } 5060 5061 // Checks if name is a legal method name. 5062 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5063 if (!_need_verify) { return; } 5064 5065 assert(name != nullptr, "method name is null"); 5066 char* bytes = (char*)name->bytes(); 5067 unsigned int length = name->utf8_length(); 5068 bool legal = false; 5069 5070 if (length > 0) { 5071 if (bytes[0] == JVM_SIGNATURE_SPECIAL) { 5072 if (name == vmSymbols::object_initializer_name() || 5073 name == vmSymbols::class_initializer_name()) { 5074 legal = true; 5075 } 5076 } else if (_major_version < JAVA_1_5_VERSION) { 5077 const char* p; 5078 p = skip_over_field_name(bytes, false, length); 5079 legal = (p != nullptr) && ((p - bytes) == (int)length); 5080 } else { 5081 // 4881221: relax the constraints based on JSR202 spec 5082 legal = verify_unqualified_name(bytes, length, LegalMethod); 5083 } 5084 } 5085 5086 if (!legal) { 5087 ResourceMark rm(THREAD); 5088 assert(_class_name != nullptr, "invariant"); 5089 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5090 Exceptions::fthrow( 5091 THREAD_AND_LOCATION, 5092 vmSymbols::java_lang_ClassFormatError(), 5093 "Illegal method name \"%.*s\" in class %s", length, bytes, 5094 _class_name->as_C_string() 5095 ); 5096 return; 5097 } 5098 } 5099 5100 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const { 5101 const char* const bytes = (const char*)signature->bytes(); 5102 const unsigned int length = signature->utf8_length(); 5103 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false); 5104 5105 if (p == nullptr || (p - bytes) != (int)length) { 5106 return false; 5107 } 5108 return true; 5109 } 5110 5111 // Checks if signature is a legal field signature. 5112 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5113 const Symbol* signature, 5114 TRAPS) const { 5115 if (!_need_verify) { return; } 5116 5117 const char* const bytes = (const char*)signature->bytes(); 5118 const unsigned int length = signature->utf8_length(); 5119 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5120 5121 if (p == nullptr || (p - bytes) != (int)length) { 5122 throwIllegalSignature("Field", name, signature, CHECK); 5123 } 5124 } 5125 5126 // Check that the signature is compatible with the method name. For example, 5127 // check that <init> has a void signature. 5128 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name, 5129 const Symbol* signature, 5130 TRAPS) const { 5131 if (!_need_verify) { 5132 return; 5133 } 5134 5135 // Class initializers cannot have args for class format version >= 51. 5136 if (name == vmSymbols::class_initializer_name() && 5137 signature != vmSymbols::void_method_signature() && 5138 _major_version >= JAVA_7_VERSION) { 5139 throwIllegalSignature("Method", name, signature, THREAD); 5140 return; 5141 } 5142 5143 int sig_length = signature->utf8_length(); 5144 if (name->utf8_length() > 0 && 5145 name->char_at(0) == JVM_SIGNATURE_SPECIAL && 5146 sig_length > 0 && 5147 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) { 5148 throwIllegalSignature("Method", name, signature, THREAD); 5149 } 5150 } 5151 5152 // Checks if signature is a legal method signature. 5153 // Returns number of parameters 5154 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5155 const Symbol* signature, 5156 TRAPS) const { 5157 if (!_need_verify) { 5158 // make sure caller's args_size will be less than 0 even for non-static 5159 // method so it will be recomputed in compute_size_of_parameters(). 5160 return -2; 5161 } 5162 5163 unsigned int args_size = 0; 5164 const char* p = (const char*)signature->bytes(); 5165 unsigned int length = signature->utf8_length(); 5166 const char* nextp; 5167 5168 // The first character must be a '(' 5169 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5170 length--; 5171 // Skip over legal field signatures 5172 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5173 while ((length > 0) && (nextp != nullptr)) { 5174 args_size++; 5175 if (p[0] == 'J' || p[0] == 'D') { 5176 args_size++; 5177 } 5178 length -= pointer_delta_as_int(nextp, p); 5179 p = nextp; 5180 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5181 } 5182 // The first non-signature thing better be a ')' 5183 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5184 length--; 5185 // Now we better just have a return value 5186 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5187 if (nextp && ((int)length == (nextp - p))) { 5188 return args_size; 5189 } 5190 } 5191 } 5192 // Report error 5193 throwIllegalSignature("Method", name, signature, THREAD); 5194 return 0; 5195 } 5196 5197 int ClassFileParser::static_field_size() const { 5198 assert(_layout_info != nullptr, "invariant"); 5199 return _layout_info->_static_field_size; 5200 } 5201 5202 int ClassFileParser::total_oop_map_count() const { 5203 assert(_layout_info != nullptr, "invariant"); 5204 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count; 5205 } 5206 5207 jint ClassFileParser::layout_size() const { 5208 assert(_layout_info != nullptr, "invariant"); 5209 return _layout_info->_instance_size; 5210 } 5211 5212 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5213 const Array<Method*>* methods) { 5214 assert(ik != nullptr, "invariant"); 5215 assert(methods != nullptr, "invariant"); 5216 5217 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5218 // (We used to do this lazily, but now we query it in Rewriter, 5219 // which is eagerly done for every method, so we might as well do it now, 5220 // when everything is fresh in memory.) 5221 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik); 5222 5223 if (klass_id != vmSymbolID::NO_SID) { 5224 for (int j = 0; j < methods->length(); ++j) { 5225 Method* method = methods->at(j); 5226 method->init_intrinsic_id(klass_id); 5227 5228 if (CheckIntrinsics) { 5229 // Check if an intrinsic is defined for method 'method', 5230 // but the method is not annotated with @IntrinsicCandidate. 5231 if (method->intrinsic_id() != vmIntrinsics::_none && 5232 !method->intrinsic_candidate()) { 5233 tty->print("Compiler intrinsic is defined for method [%s], " 5234 "but the method is not annotated with @IntrinsicCandidate.%s", 5235 method->name_and_sig_as_C_string(), 5236 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5237 ); 5238 tty->cr(); 5239 DEBUG_ONLY(vm_exit(1)); 5240 } 5241 // Check is the method 'method' is annotated with @IntrinsicCandidate, 5242 // but there is no intrinsic available for it. 5243 if (method->intrinsic_candidate() && 5244 method->intrinsic_id() == vmIntrinsics::_none) { 5245 tty->print("Method [%s] is annotated with @IntrinsicCandidate, " 5246 "but no compiler intrinsic is defined for the method.%s", 5247 method->name_and_sig_as_C_string(), 5248 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5249 ); 5250 tty->cr(); 5251 DEBUG_ONLY(vm_exit(1)); 5252 } 5253 } 5254 } // end for 5255 5256 #ifdef ASSERT 5257 if (CheckIntrinsics) { 5258 // Check for orphan methods in the current class. A method m 5259 // of a class C is orphan if an intrinsic is defined for method m, 5260 // but class C does not declare m. 5261 // The check is potentially expensive, therefore it is available 5262 // only in debug builds. 5263 5264 for (auto id : EnumRange<vmIntrinsicID>{}) { 5265 if (vmIntrinsics::_compiledLambdaForm == id) { 5266 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5267 // generated for the JVM from a LambdaForm and therefore no method 5268 // is defined for it. 5269 continue; 5270 } 5271 if (vmIntrinsics::_blackhole == id) { 5272 // The _blackhole intrinsic is a special marker. No explicit method 5273 // is defined for it. 5274 continue; 5275 } 5276 5277 if (vmIntrinsics::class_for(id) == klass_id) { 5278 // Check if the current class contains a method with the same 5279 // name, flags, signature. 5280 bool match = false; 5281 for (int j = 0; j < methods->length(); ++j) { 5282 const Method* method = methods->at(j); 5283 if (method->intrinsic_id() == id) { 5284 match = true; 5285 break; 5286 } 5287 } 5288 5289 if (!match) { 5290 char buf[1000]; 5291 tty->print("Compiler intrinsic is defined for method [%s], " 5292 "but the method is not available in class [%s].%s", 5293 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)), 5294 ik->name()->as_C_string(), 5295 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5296 ); 5297 tty->cr(); 5298 DEBUG_ONLY(vm_exit(1)); 5299 } 5300 } 5301 } // end for 5302 } // CheckIntrinsics 5303 #endif // ASSERT 5304 } 5305 } 5306 5307 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, 5308 const ClassInstanceInfo& cl_inst_info, 5309 TRAPS) { 5310 if (_klass != nullptr) { 5311 return _klass; 5312 } 5313 5314 InstanceKlass* const ik = 5315 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5316 5317 if (is_hidden()) { 5318 mangle_hidden_class_name(ik); 5319 } 5320 5321 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL); 5322 5323 assert(_klass == ik, "invariant"); 5324 return ik; 5325 } 5326 5327 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, 5328 bool changed_by_loadhook, 5329 const ClassInstanceInfo& cl_inst_info, 5330 TRAPS) { 5331 assert(ik != nullptr, "invariant"); 5332 5333 // Set name and CLD before adding to CLD 5334 ik->set_class_loader_data(_loader_data); 5335 ik->set_class_loader_type(); 5336 ik->set_name(_class_name); 5337 5338 // Add all classes to our internal class loader list here, 5339 // including classes in the bootstrap (null) class loader. 5340 const bool publicize = !is_internal(); 5341 5342 _loader_data->add_class(ik, publicize); 5343 5344 set_klass_to_deallocate(ik); 5345 5346 assert(_layout_info != nullptr, "invariant"); 5347 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity"); 5348 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count, 5349 "sanity"); 5350 5351 assert(ik->is_instance_klass(), "sanity"); 5352 assert(ik->size_helper() == _layout_info->_instance_size, "sanity"); 5353 5354 // Fill in information already parsed 5355 ik->set_should_verify_class(_need_verify); 5356 5357 // Not yet: supers are done below to support the new subtype-checking fields 5358 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size); 5359 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields); 5360 ik->set_has_strict_static_fields(_has_strict_static_fields); 5361 5362 if (_layout_info->_is_naturally_atomic) { 5363 ik->set_is_naturally_atomic(); 5364 } 5365 5366 if (_layout_info->_must_be_atomic) { 5367 ik->set_must_be_atomic(); 5368 } 5369 5370 ik->set_static_oop_field_count(_static_oop_count); 5371 5372 // this transfers ownership of a lot of arrays from 5373 // the parser onto the InstanceKlass* 5374 apply_parsed_class_metadata(ik, _java_fields_count); 5375 5376 // can only set dynamic nest-host after static nest information is set 5377 if (cl_inst_info.dynamic_nest_host() != nullptr) { 5378 ik->set_nest_host(cl_inst_info.dynamic_nest_host()); 5379 } 5380 5381 // note that is not safe to use the fields in the parser from this point on 5382 assert(nullptr == _cp, "invariant"); 5383 assert(nullptr == _fieldinfo_stream, "invariant"); 5384 assert(nullptr == _fieldinfo_search_table, "invariant"); 5385 assert(nullptr == _fields_status, "invariant"); 5386 assert(nullptr == _methods, "invariant"); 5387 assert(nullptr == _inner_classes, "invariant"); 5388 assert(nullptr == _nest_members, "invariant"); 5389 assert(nullptr == _loadable_descriptors, "invariant"); 5390 assert(nullptr == _combined_annotations, "invariant"); 5391 assert(nullptr == _record_components, "invariant"); 5392 assert(nullptr == _permitted_subclasses, "invariant"); 5393 assert(nullptr == _inline_layout_info_array, "invariant"); 5394 5395 if (_has_localvariable_table) { 5396 ik->set_has_localvariable_table(true); 5397 } 5398 5399 if (_has_final_method) { 5400 ik->set_has_final_method(); 5401 } 5402 5403 ik->copy_method_ordering(_method_ordering, CHECK); 5404 // The InstanceKlass::_methods_jmethod_ids cache 5405 // is managed on the assumption that the initial cache 5406 // size is equal to the number of methods in the class. If 5407 // that changes, then InstanceKlass::idnum_can_increment() 5408 // has to be changed accordingly. 5409 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length())); 5410 5411 ik->set_this_class_index(_this_class_index); 5412 5413 if (_is_hidden) { 5414 // _this_class_index is a CONSTANT_Class entry that refers to this 5415 // hidden class itself. If this class needs to refer to its own methods 5416 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference 5417 // _this_class_index. However, because this class is hidden (it's 5418 // not stored in SystemDictionary), _this_class_index cannot be resolved 5419 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5420 // Therefore, we must eagerly resolve _this_class_index now. 5421 ik->constants()->klass_at_put(_this_class_index, ik); 5422 } 5423 5424 ik->set_minor_version(_minor_version); 5425 ik->set_major_version(_major_version); 5426 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5427 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5428 5429 assert(!_is_hidden || ik->is_hidden(), "must be set already"); 5430 5431 // Set PackageEntry for this_klass 5432 oop cl = ik->class_loader(); 5433 Handle clh = Handle(THREAD, cl); 5434 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5435 ik->set_package(cld, nullptr, CHECK); 5436 5437 const Array<Method*>* const methods = ik->methods(); 5438 assert(methods != nullptr, "invariant"); 5439 const int methods_len = methods->length(); 5440 5441 check_methods_for_intrinsics(ik, methods); 5442 5443 // Fill in field values obtained by parse_classfile_attributes 5444 if (_parsed_annotations->has_any_annotations()) 5445 _parsed_annotations->apply_to(ik); 5446 5447 apply_parsed_class_attributes(ik); 5448 5449 // Miranda methods 5450 if ((_num_miranda_methods > 0) || 5451 // if this class introduced new miranda methods or 5452 (_super_klass != nullptr && _super_klass->has_miranda_methods()) 5453 // super class exists and this class inherited miranda methods 5454 ) { 5455 ik->set_has_miranda_methods(); // then set a flag 5456 } 5457 5458 // Fill in information needed to compute superclasses. 5459 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5460 ik->set_transitive_interfaces(_transitive_interfaces); 5461 ik->set_local_interfaces(_local_interfaces); 5462 _transitive_interfaces = nullptr; 5463 _local_interfaces = nullptr; 5464 5465 // Initialize itable offset tables 5466 klassItable::setup_itable_offset_table(ik); 5467 5468 // Compute transitive closure of interfaces this class implements 5469 // Do final class setup 5470 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks; 5471 if (oop_map_blocks->_nonstatic_oop_map_count > 0) { 5472 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); 5473 } 5474 5475 if (_has_contended_fields || _parsed_annotations->is_contended() || 5476 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) { 5477 ik->set_has_contended_annotations(true); 5478 } 5479 5480 // Fill in has_finalizer and layout_helper 5481 set_precomputed_flags(ik); 5482 5483 // check if this class can access its super class 5484 check_super_class_access(ik, CHECK); 5485 5486 // check if this class can access its superinterfaces 5487 check_super_interface_access(ik, CHECK); 5488 5489 // check if this class overrides any final method 5490 check_final_method_override(ik, CHECK); 5491 5492 // reject static interface methods prior to Java 8 5493 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5494 check_illegal_static_method(ik, CHECK); 5495 } 5496 5497 // Obtain this_klass' module entry 5498 ModuleEntry* module_entry = ik->module(); 5499 assert(module_entry != nullptr, "module_entry should always be set"); 5500 5501 // Obtain java.lang.Module 5502 Handle module_handle(THREAD, module_entry->module_oop()); 5503 5504 // Allocate mirror and initialize static fields 5505 java_lang_Class::create_mirror(ik, 5506 Handle(THREAD, _loader_data->class_loader()), 5507 module_handle, 5508 _protection_domain, 5509 cl_inst_info.class_data(), 5510 CHECK); 5511 5512 assert(_all_mirandas != nullptr, "invariant"); 5513 5514 // Generate any default methods - default methods are public interface methods 5515 // that have a default implementation. This is new with Java 8. 5516 if (_has_nonstatic_concrete_methods) { 5517 DefaultMethods::generate_default_methods(ik, 5518 _all_mirandas, 5519 CHECK); 5520 } 5521 5522 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5523 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5524 !module_entry->has_default_read_edges()) { 5525 if (!module_entry->set_has_default_read_edges()) { 5526 // We won a potential race 5527 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5528 } 5529 } 5530 5531 if (is_inline_type()) { 5532 InlineKlass* vk = InlineKlass::cast(ik); 5533 vk->set_payload_alignment(_layout_info->_payload_alignment); 5534 vk->set_payload_offset(_layout_info->_payload_offset); 5535 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes); 5536 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes); 5537 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment); 5538 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes); 5539 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes); 5540 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes); 5541 vk->set_null_marker_offset(_layout_info->_null_marker_offset); 5542 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset); 5543 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type(); 5544 vk->initialize_calling_convention(CHECK); 5545 } 5546 5547 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface() 5548 && _class_name != vmSymbols::java_lang_Object()) { 5549 // Both abstract and concrete value classes need a field map for acmp 5550 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset); 5551 // Current format of acmp maps: 5552 // All maps are stored contiguously in a single int array because it might 5553 // be too early to instantiate an Object array (to be investigated) 5554 // Format is: 5555 // [number_of_nonoop_entries][offset0][size[0][offset1][size1]...[oop_offset0][oop_offset1]... 5556 // ^ ^ 5557 // | | 5558 // --------------------- Pair of integer describing a segment of 5559 // contiguous non-oop fields 5560 // First element is the number of segment of contiguous non-oop fields 5561 // Then, each segment of contiguous non-oop fields is described by two consecutive elements: 5562 // the offset then the size. 5563 // After the last segment of contiguous non-oop fields, oop fields are described, one element 5564 // per oop field, containing the offset of the field. 5565 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2; 5566 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length(); 5567 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1; 5568 5569 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK); 5570 typeArrayHandle map_h(THREAD, map); 5571 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK); 5572 5573 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length()); 5574 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length()); 5575 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) { 5576 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first); 5577 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second); 5578 5579 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data. 5580 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first); 5581 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second); 5582 } 5583 int oop_map_start = nonoop_acmp_map_size + 1; 5584 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) { 5585 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i)); 5586 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i)); 5587 } 5588 assert(acmp_maps_array->length() == map_h->length(), "sanity"); 5589 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h()); 5590 ik->set_acmp_maps_array(acmp_maps_array); 5591 } 5592 5593 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5594 5595 if (!is_internal()) { 5596 ik->print_class_load_logging(_loader_data, module_entry, _stream); 5597 5598 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5599 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && 5600 log_is_enabled(Info, class, preview)) { 5601 ResourceMark rm; 5602 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5603 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); 5604 } 5605 5606 if (log_is_enabled(Debug, class, resolve)) { 5607 ResourceMark rm; 5608 // print out the superclass. 5609 const char * from = ik->external_name(); 5610 if (ik->super() != nullptr) { 5611 log_debug(class, resolve)("%s %s (super)", 5612 from, 5613 ik->super()->external_name()); 5614 } 5615 // print out each of the interface classes referred to by this class. 5616 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5617 if (local_interfaces != nullptr) { 5618 const int length = local_interfaces->length(); 5619 for (int i = 0; i < length; i++) { 5620 const InstanceKlass* const k = local_interfaces->at(i); 5621 const char * to = k->external_name(); 5622 log_debug(class, resolve)("%s %s (interface)", from, to); 5623 } 5624 } 5625 } 5626 } 5627 5628 // If we reach here, all is well. 5629 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5630 // in order for it to not be destroyed in the ClassFileParser destructor. 5631 set_klass_to_deallocate(nullptr); 5632 5633 // it's official 5634 set_klass(ik); 5635 5636 DEBUG_ONLY(ik->verify();) 5637 } 5638 5639 void ClassFileParser::update_class_name(Symbol* new_class_name) { 5640 // Decrement the refcount in the old name, since we're clobbering it. 5641 _class_name->decrement_refcount(); 5642 5643 _class_name = new_class_name; 5644 // Increment the refcount of the new name. 5645 // Now the ClassFileParser owns this name and will decrement in 5646 // the destructor. 5647 _class_name->increment_refcount(); 5648 } 5649 5650 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5651 Symbol* name, 5652 ClassLoaderData* loader_data, 5653 const ClassLoadInfo* cl_info, 5654 Publicity pub_level, 5655 TRAPS) : 5656 _stream(stream), 5657 _class_name(nullptr), 5658 _loader_data(loader_data), 5659 _is_hidden(cl_info->is_hidden()), 5660 _can_access_vm_annotations(cl_info->can_access_vm_annotations()), 5661 _orig_cp_size(0), 5662 _static_oop_count(0), 5663 _super_klass(), 5664 _cp(nullptr), 5665 _fieldinfo_stream(nullptr), 5666 _fieldinfo_search_table(nullptr), 5667 _fields_status(nullptr), 5668 _methods(nullptr), 5669 _inner_classes(nullptr), 5670 _nest_members(nullptr), 5671 _nest_host(0), 5672 _permitted_subclasses(nullptr), 5673 _loadable_descriptors(nullptr), 5674 _record_components(nullptr), 5675 _local_interfaces(nullptr), 5676 _local_interface_indexes(nullptr), 5677 _transitive_interfaces(nullptr), 5678 _combined_annotations(nullptr), 5679 _class_annotations(nullptr), 5680 _class_type_annotations(nullptr), 5681 _fields_annotations(nullptr), 5682 _fields_type_annotations(nullptr), 5683 _klass(nullptr), 5684 _klass_to_deallocate(nullptr), 5685 _parsed_annotations(nullptr), 5686 _layout_info(nullptr), 5687 _inline_layout_info_array(nullptr), 5688 _temp_field_info(nullptr), 5689 _method_ordering(nullptr), 5690 _all_mirandas(nullptr), 5691 _vtable_size(0), 5692 _itable_size(0), 5693 _num_miranda_methods(0), 5694 _protection_domain(cl_info->protection_domain()), 5695 _access_flags(), 5696 _pub_level(pub_level), 5697 _bad_constant_seen(0), 5698 _synthetic_flag(false), 5699 _sde_length(false), 5700 _sde_buffer(nullptr), 5701 _sourcefile_index(0), 5702 _generic_signature_index(0), 5703 _major_version(0), 5704 _minor_version(0), 5705 _this_class_index(0), 5706 _super_class_index(0), 5707 _itfs_len(0), 5708 _java_fields_count(0), 5709 _need_verify(false), 5710 _has_nonstatic_concrete_methods(false), 5711 _declares_nonstatic_concrete_methods(false), 5712 _has_localvariable_table(false), 5713 _has_final_method(false), 5714 _has_contended_fields(false), 5715 _has_aot_runtime_setup_method(false), 5716 _has_strict_static_fields(false), 5717 _is_naturally_atomic(false), 5718 _must_be_atomic(true), 5719 _has_loosely_consistent_annotation(false), 5720 _has_finalizer(false), 5721 _has_empty_finalizer(false), 5722 _max_bootstrap_specifier_index(-1) { 5723 5724 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name(); 5725 _class_name->increment_refcount(); 5726 5727 assert(_loader_data != nullptr, "invariant"); 5728 assert(stream != nullptr, "invariant"); 5729 assert(_stream != nullptr, "invariant"); 5730 assert(_stream->buffer() == _stream->current(), "invariant"); 5731 assert(_class_name != nullptr, "invariant"); 5732 assert(0 == _access_flags.as_unsigned_short(), "invariant"); 5733 5734 // Figure out whether we can skip format checking (matching classic VM behavior) 5735 // Always verify CFLH bytes from the user agents. 5736 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader()); 5737 5738 // synch back verification state to stream to check for truncation. 5739 stream->set_need_verify(_need_verify); 5740 5741 parse_stream(stream, CHECK); 5742 5743 post_process_parsed_stream(stream, _cp, CHECK); 5744 } 5745 5746 void ClassFileParser::clear_class_metadata() { 5747 // metadata created before the instance klass is created. Must be 5748 // deallocated if classfile parsing returns an error. 5749 _cp = nullptr; 5750 _fieldinfo_stream = nullptr; 5751 _fieldinfo_search_table = nullptr; 5752 _fields_status = nullptr; 5753 _methods = nullptr; 5754 _inner_classes = nullptr; 5755 _nest_members = nullptr; 5756 _permitted_subclasses = nullptr; 5757 _loadable_descriptors = nullptr; 5758 _combined_annotations = nullptr; 5759 _class_annotations = _class_type_annotations = nullptr; 5760 _fields_annotations = _fields_type_annotations = nullptr; 5761 _record_components = nullptr; 5762 _inline_layout_info_array = nullptr; 5763 } 5764 5765 // Destructor to clean up 5766 ClassFileParser::~ClassFileParser() { 5767 _class_name->decrement_refcount(); 5768 5769 if (_cp != nullptr) { 5770 MetadataFactory::free_metadata(_loader_data, _cp); 5771 } 5772 5773 if (_fieldinfo_stream != nullptr) { 5774 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream); 5775 } 5776 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table); 5777 5778 if (_fields_status != nullptr) { 5779 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status); 5780 } 5781 5782 if (_inline_layout_info_array != nullptr) { 5783 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array); 5784 } 5785 5786 if (_methods != nullptr) { 5787 // Free methods 5788 InstanceKlass::deallocate_methods(_loader_data, _methods); 5789 } 5790 5791 // beware of the Universe::empty_blah_array!! 5792 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) { 5793 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 5794 } 5795 5796 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) { 5797 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 5798 } 5799 5800 if (_record_components != nullptr) { 5801 InstanceKlass::deallocate_record_components(_loader_data, _record_components); 5802 } 5803 5804 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) { 5805 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses); 5806 } 5807 5808 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) { 5809 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors); 5810 } 5811 5812 // Free interfaces 5813 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 5814 _local_interfaces, _transitive_interfaces); 5815 5816 if (_combined_annotations != nullptr) { 5817 // After all annotations arrays have been created, they are installed into the 5818 // Annotations object that will be assigned to the InstanceKlass being created. 5819 5820 // Deallocate the Annotations object and the installed annotations arrays. 5821 _combined_annotations->deallocate_contents(_loader_data); 5822 5823 // If the _combined_annotations pointer is non-null, 5824 // then the other annotations fields should have been cleared. 5825 assert(_class_annotations == nullptr, "Should have been cleared"); 5826 assert(_class_type_annotations == nullptr, "Should have been cleared"); 5827 assert(_fields_annotations == nullptr, "Should have been cleared"); 5828 assert(_fields_type_annotations == nullptr, "Should have been cleared"); 5829 } else { 5830 // If the annotations arrays were not installed into the Annotations object, 5831 // then they have to be deallocated explicitly. 5832 MetadataFactory::free_array<u1>(_loader_data, _class_annotations); 5833 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations); 5834 Annotations::free_contents(_loader_data, _fields_annotations); 5835 Annotations::free_contents(_loader_data, _fields_type_annotations); 5836 } 5837 5838 clear_class_metadata(); 5839 _transitive_interfaces = nullptr; 5840 _local_interfaces = nullptr; 5841 5842 // deallocate the klass if already created. Don't directly deallocate, but add 5843 // to the deallocate list so that the klass is removed from the CLD::_klasses list 5844 // at a safepoint. 5845 if (_klass_to_deallocate != nullptr) { 5846 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 5847 } 5848 } 5849 5850 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 5851 TRAPS) { 5852 5853 assert(stream != nullptr, "invariant"); 5854 assert(_class_name != nullptr, "invariant"); 5855 5856 // BEGIN STREAM PARSING 5857 stream->guarantee_more(8, CHECK); // magic, major, minor 5858 // Magic value 5859 const u4 magic = stream->get_u4_fast(); 5860 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 5861 "Incompatible magic value %u in class file %s", 5862 magic, CHECK); 5863 5864 // Version numbers 5865 _minor_version = stream->get_u2_fast(); 5866 _major_version = stream->get_u2_fast(); 5867 5868 // Check version numbers - we check this even with verifier off 5869 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 5870 5871 stream->guarantee_more(3, CHECK); // length, first cp tag 5872 u2 cp_size = stream->get_u2_fast(); 5873 5874 guarantee_property( 5875 cp_size >= 1, "Illegal constant pool size %u in class file %s", 5876 cp_size, CHECK); 5877 5878 _orig_cp_size = cp_size; 5879 if (is_hidden()) { // Add a slot for hidden class name. 5880 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK); 5881 cp_size++; 5882 } 5883 5884 _cp = ConstantPool::allocate(_loader_data, 5885 cp_size, 5886 CHECK); 5887 5888 ConstantPool* const cp = _cp; 5889 5890 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 5891 5892 assert(cp_size == (u2)cp->length(), "invariant"); 5893 5894 // ACCESS FLAGS 5895 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 5896 5897 // Access flags 5898 u2 flags; 5899 // JVM_ACC_MODULE is defined in JDK-9 and later. 5900 if (_major_version >= JAVA_9_VERSION) { 5901 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 5902 } else { 5903 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 5904 } 5905 5906 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 5907 // Set abstract bit for old class files for backward compatibility 5908 flags |= JVM_ACC_ABSTRACT; 5909 } 5910 5911 // Fixing ACC_SUPER/ACC_IDENTITY for old class files 5912 if (!supports_inline_types()) { 5913 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 5914 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 5915 if (!is_module && !is_interface) { 5916 flags |= JVM_ACC_IDENTITY; 5917 } 5918 } 5919 5920 verify_legal_class_modifiers(flags, nullptr, false, CHECK); 5921 5922 short bad_constant = class_bad_constant_seen(); 5923 if (bad_constant != 0) { 5924 // Do not throw CFE until after the access_flags are checked because if 5925 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 5926 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD); 5927 return; 5928 } 5929 5930 _access_flags.set_flags(flags); 5931 5932 // This class and superclass 5933 _this_class_index = stream->get_u2_fast(); 5934 guarantee_property( 5935 valid_cp_range(_this_class_index, cp_size) && 5936 cp->tag_at(_this_class_index).is_unresolved_klass(), 5937 "Invalid this class index %u in constant pool in class file %s", 5938 _this_class_index, CHECK); 5939 5940 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 5941 assert(class_name_in_cp != nullptr, "class_name can't be null"); 5942 5943 // Don't need to check whether this class name is legal or not. 5944 // It has been checked when constant pool is parsed. 5945 // However, make sure it is not an array type. 5946 if (_need_verify) { 5947 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY, 5948 "Bad class name in class file %s", 5949 CHECK); 5950 } 5951 5952 #ifdef ASSERT 5953 // Basic sanity checks 5954 if (_is_hidden) { 5955 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name"); 5956 } 5957 #endif 5958 5959 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class. 5960 5961 if (_is_hidden) { 5962 assert(_class_name != nullptr, "Unexpected null _class_name"); 5963 #ifdef ASSERT 5964 if (_need_verify) { 5965 verify_legal_class_name(_class_name, CHECK); 5966 } 5967 #endif 5968 5969 } else { 5970 // Check if name in class file matches given name 5971 if (_class_name != class_name_in_cp) { 5972 if (_class_name != vmSymbols::unknown_class_name()) { 5973 ResourceMark rm(THREAD); 5974 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5975 Exceptions::fthrow(THREAD_AND_LOCATION, 5976 vmSymbols::java_lang_NoClassDefFoundError(), 5977 "%s (wrong name: %s)", 5978 _class_name->as_C_string(), 5979 class_name_in_cp->as_C_string() 5980 ); 5981 return; 5982 } else { 5983 // The class name was not known by the caller so we set it from 5984 // the value in the CP. 5985 update_class_name(class_name_in_cp); 5986 } 5987 // else nothing to do: the expected class name matches what is in the CP 5988 } 5989 } 5990 5991 // Verification prevents us from creating names with dots in them, this 5992 // asserts that that's the case. 5993 assert(is_internal_format(_class_name), "external class name format used internally"); 5994 5995 if (!is_internal()) { 5996 LogTarget(Debug, class, preorder) lt; 5997 if (lt.is_enabled()){ 5998 ResourceMark rm(THREAD); 5999 LogStream ls(lt); 6000 ls.print("%s", _class_name->as_klass_external_name()); 6001 if (stream->source() != nullptr) { 6002 ls.print(" source: %s", stream->source()); 6003 } 6004 ls.cr(); 6005 } 6006 } 6007 6008 // SUPERKLASS 6009 _super_class_index = stream->get_u2_fast(); 6010 check_super_class(cp, 6011 _super_class_index, 6012 _need_verify, 6013 CHECK); 6014 6015 // Interfaces 6016 _itfs_len = stream->get_u2_fast(); 6017 parse_interfaces(stream, 6018 _itfs_len, 6019 cp, 6020 &_has_nonstatic_concrete_methods, 6021 CHECK); 6022 6023 // Fields (offsets are filled in later) 6024 parse_fields(stream, 6025 _access_flags, 6026 cp, 6027 cp_size, 6028 &_java_fields_count, 6029 CHECK); 6030 6031 assert(_temp_field_info != nullptr, "invariant"); 6032 6033 // Methods 6034 parse_methods(stream, 6035 is_interface(), 6036 !is_identity_class(), 6037 is_abstract_class(), 6038 &_has_localvariable_table, 6039 &_has_final_method, 6040 &_declares_nonstatic_concrete_methods, 6041 CHECK); 6042 6043 assert(_methods != nullptr, "invariant"); 6044 6045 if (_declares_nonstatic_concrete_methods) { 6046 _has_nonstatic_concrete_methods = true; 6047 } 6048 6049 // Additional attributes/annotations 6050 _parsed_annotations = new ClassAnnotationCollector(); 6051 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6052 6053 assert(_inner_classes != nullptr, "invariant"); 6054 6055 // Finalize the Annotations metadata object, 6056 // now that all annotation arrays have been created. 6057 create_combined_annotations(CHECK); 6058 6059 // Make sure this is the end of class file stream 6060 guarantee_property(stream->at_eos(), 6061 "Extra bytes at the end of class file %s", 6062 CHECK); 6063 6064 // all bytes in stream read and parsed 6065 } 6066 6067 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) { 6068 ResourceMark rm; 6069 // Construct hidden name from _class_name, "+", and &ik. Note that we can't 6070 // use a '/' because that confuses finding the class's package. Also, can't 6071 // use an illegal char such as ';' because that causes serialization issues 6072 // and issues with hidden classes that create their own hidden classes. 6073 char addr_buf[20]; 6074 if (CDSConfig::is_dumping_static_archive()) { 6075 // We want stable names for the archived hidden classes (only for static 6076 // archive for now). Spaces under default_SharedBaseAddress() will be 6077 // occupied by the archive at run time, so we know that no dynamically 6078 // loaded InstanceKlass will be placed under there. 6079 static volatile size_t counter = 0; 6080 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it 6081 size_t new_id = AtomicAccess::add(&counter, (size_t)1); 6082 jio_snprintf(addr_buf, 20, "0x%zx", new_id); 6083 } else { 6084 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik)); 6085 } 6086 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf); 6087 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len); 6088 jio_snprintf(new_name, new_name_len, "%s+%s", 6089 _class_name->as_C_string(), addr_buf); 6090 update_class_name(SymbolTable::new_symbol(new_name)); 6091 6092 // Add a Utf8 entry containing the hidden name. 6093 assert(_class_name != nullptr, "Unexpected null _class_name"); 6094 int hidden_index = _orig_cp_size; // this is an extra slot we added 6095 _cp->symbol_at_put(hidden_index, _class_name); 6096 6097 // Update this_class_index's slot in the constant pool with the new Utf8 entry. 6098 // We have to update the resolved_klass_index and the name_index together 6099 // so extract the existing resolved_klass_index first. 6100 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index); 6101 int resolved_klass_index = cp_klass_slot.resolved_klass_index(); 6102 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index); 6103 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size, 6104 "Bad name_index"); 6105 } 6106 6107 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6108 ConstantPool* cp, 6109 TRAPS) { 6110 assert(stream != nullptr, "invariant"); 6111 assert(stream->at_eos(), "invariant"); 6112 assert(cp != nullptr, "invariant"); 6113 assert(_loader_data != nullptr, "invariant"); 6114 6115 if (_class_name == vmSymbols::java_lang_Object()) { 6116 precond(_super_class_index == 0); 6117 precond(_super_klass == nullptr); 6118 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6119 "java.lang.Object cannot implement an interface in class file %s", 6120 CHECK); 6121 } else { 6122 // Set _super_klass after class file is parsed and format is checked 6123 assert(_super_class_index > 0, "any class other than Object must have a super class"); 6124 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6125 if (is_interface()) { 6126 // Before attempting to resolve the superclass, check for class format 6127 // errors not checked yet. 6128 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6129 "Interfaces must have java.lang.Object as superclass in class file %s", 6130 CHECK); 6131 } 6132 Handle loader(THREAD, _loader_data->class_loader()); 6133 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) { 6134 // fast path to avoid lookup 6135 _super_klass = vmClasses::Object_klass(); 6136 } else { 6137 _super_klass = (const InstanceKlass*) 6138 SystemDictionary::resolve_super_or_fail(_class_name, 6139 super_class_name, 6140 loader, 6141 true, 6142 CHECK); 6143 } 6144 } 6145 6146 if (_super_klass != nullptr) { 6147 if (_super_klass->is_interface()) { 6148 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD); 6149 return; 6150 } 6151 6152 if (_super_klass->is_final()) { 6153 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD); 6154 return; 6155 } 6156 6157 if (Arguments::is_valhalla_enabled()) { 6158 check_identity_and_value_modifiers(this, _super_klass, CHECK); 6159 } 6160 6161 if (_super_klass->has_nonstatic_concrete_methods()) { 6162 _has_nonstatic_concrete_methods = true; 6163 } 6164 } 6165 6166 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) { 6167 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 6168 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class", 6169 _class_name->as_klass_external_name())); 6170 } 6171 6172 // Determining if the class allows tearing or not (default is not) 6173 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) { 6174 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue) 6175 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) { 6176 // Conditions above are not sufficient to determine atomicity requirements, 6177 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too 6178 // Marking as not needing atomicity for now, can be updated when computing the fields layout 6179 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by 6180 // the FieldLayoutBuilder, not with this _must_be_atomic field. 6181 _must_be_atomic = false; 6182 } 6183 // Apply VM options override 6184 if (*ForceNonTearable != '\0') { 6185 // Allow a command line switch to force the same atomicity property: 6186 const char* class_name_str = _class_name->as_C_string(); 6187 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) { 6188 _must_be_atomic = true; 6189 } 6190 } 6191 } 6192 6193 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length(); 6194 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK); 6195 if (_local_interface_indexes != nullptr) { 6196 for (int i = 0; i < _local_interface_indexes->length(); i++) { 6197 u2 interface_index = _local_interface_indexes->at(i); 6198 Klass* interf; 6199 if (cp->tag_at(interface_index).is_klass()) { 6200 interf = cp->resolved_klass_at(interface_index); 6201 } else { 6202 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 6203 6204 // Don't need to check legal name because it's checked when parsing constant pool. 6205 // But need to make sure it's not an array type. 6206 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 6207 "Bad interface name in class file %s", CHECK); 6208 6209 // Call resolve on the interface class name with class circularity checking 6210 interf = SystemDictionary::resolve_super_or_fail( 6211 _class_name, 6212 unresolved_klass, 6213 Handle(THREAD, _loader_data->class_loader()), 6214 false, 6215 CHECK); 6216 } 6217 6218 if (!interf->is_interface()) { 6219 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 6220 err_msg("class %s can not implement %s, because it is not an interface (%s)", 6221 _class_name->as_klass_external_name(), 6222 interf->external_name(), 6223 interf->class_in_module_of_loader())); 6224 } 6225 6226 if (Arguments::is_valhalla_enabled()) { 6227 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags 6228 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK); 6229 } 6230 6231 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 6232 _has_nonstatic_concrete_methods = true; 6233 } 6234 _local_interfaces->at_put(i, InstanceKlass::cast(interf)); 6235 } 6236 } 6237 assert(_local_interfaces != nullptr, "invariant"); 6238 6239 // Compute the transitive list of all unique interfaces implemented by this class 6240 _transitive_interfaces = 6241 compute_transitive_interfaces(_super_klass, 6242 _local_interfaces, 6243 _loader_data, 6244 CHECK); 6245 6246 assert(_transitive_interfaces != nullptr, "invariant"); 6247 6248 // sort methods 6249 _method_ordering = sort_methods(_methods); 6250 6251 _all_mirandas = new GrowableArray<Method*>(20); 6252 6253 Handle loader(THREAD, _loader_data->class_loader()); 6254 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6255 &_num_miranda_methods, 6256 _all_mirandas, 6257 _super_klass, 6258 _methods, 6259 _access_flags, 6260 _major_version, 6261 loader, 6262 _class_name, 6263 _local_interfaces); 6264 6265 // Size of Java itable (in words) 6266 _itable_size = is_interface() ? 0 : 6267 klassItable::compute_itable_size(_transitive_interfaces); 6268 6269 assert(_parsed_annotations != nullptr, "invariant"); 6270 6271 if (Arguments::is_valhalla_enabled()) { 6272 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) { 6273 FieldInfo fieldinfo = *it; 6274 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time 6275 Symbol* sig = fieldinfo.signature(cp); 6276 if (fieldinfo.field_flags().is_null_free_inline_type()) { 6277 // Pre-load classes of null-free fields that are candidate for flattening 6278 TempNewSymbol s = Signature::strip_envelope(sig); 6279 if (s == _class_name) { 6280 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(), 6281 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string())); 6282 } 6283 log_info(class, preload)("Preloading of class %s during loading of class %s. " 6284 "Cause: a null-free non-static field is declared with this type", 6285 s->as_C_string(), _class_name->as_C_string()); 6286 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection(_class_name, s, 6287 Handle(THREAD, 6288 _loader_data->class_loader()), 6289 false, THREAD); 6290 if (HAS_PENDING_EXCEPTION) { 6291 log_info(class, preload)("Preloading of class %s during loading of class %s " 6292 "(cause: null-free non-static field) failed: %s", 6293 s->as_C_string(), _class_name->as_C_string(), 6294 PENDING_EXCEPTION->klass()->name()->as_C_string()); 6295 return; // Exception is still pending 6296 } 6297 assert(klass != nullptr, "Sanity check"); 6298 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK); 6299 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK); 6300 log_info(class, preload)("Preloading of class %s during loading of class %s " 6301 "(cause: null-free non-static field) succeeded", 6302 s->as_C_string(), _class_name->as_C_string()); 6303 } else if (Signature::has_envelope(sig) && PreloadClasses) { 6304 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute 6305 // Those classes would be required later for the flattening of nullable inline type fields 6306 TempNewSymbol name = Signature::strip_envelope(sig); 6307 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) { 6308 log_info(class, preload)("Preloading of class %s during loading of class %s. " 6309 "Cause: field type in LoadableDescriptors attribute", 6310 name->as_C_string(), _class_name->as_C_string()); 6311 oop loader = loader_data()->class_loader(); 6312 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name, 6313 Handle(THREAD, loader), 6314 false, THREAD); 6315 6316 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same"); 6317 6318 if (klass != nullptr) { 6319 if (klass->is_inline_klass()) { 6320 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK); 6321 log_info(class, preload)("Preloading of class %s during loading of class %s " 6322 "(cause: field type in LoadableDescriptors attribute) succeeded", 6323 name->as_C_string(), _class_name->as_C_string()); 6324 } else { 6325 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log this 6326 log_info(class, preload)("Preloading of class %s during loading of class %s " 6327 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class", 6328 name->as_C_string(), _class_name->as_C_string()); 6329 } 6330 } else { 6331 log_info(class, preload)("Preloading of class %s during loading of class %s " 6332 "(cause: field type in LoadableDescriptors attribute) failed : %s", 6333 name->as_C_string(), _class_name->as_C_string(), 6334 PENDING_EXCEPTION->klass()->name()->as_C_string()); 6335 6336 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not 6337 // impact loading of current class. 6338 CLEAR_PENDING_EXCEPTION; 6339 } 6340 } else { 6341 // Just poking the system dictionary to see if the class has already be loaded. Looking for migrated classes 6342 // used when --enable-preview when jdk isn't compiled with --enable-preview so doesn't include LoadableDescriptors. 6343 // This is temporary. 6344 oop loader = loader_data()->class_loader(); 6345 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader)); 6346 if (klass != nullptr && klass->is_inline_klass()) { 6347 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK); 6348 log_info(class, preload)("Preloading of class %s during loading of class %s " 6349 "(cause: field type not in LoadableDescriptors attribute) succeeded", 6350 name->as_C_string(), _class_name->as_C_string()); 6351 } 6352 } 6353 } 6354 } 6355 } 6356 6357 _layout_info = new FieldLayoutInfo(); 6358 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info, 6359 _parsed_annotations->is_contended(), is_inline_type(), 6360 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(), 6361 _must_be_atomic, _layout_info, _inline_layout_info_array); 6362 lb.build_layout(); 6363 6364 // If it turned out that we didn't inline any of the fields, we deallocate 6365 // the array of InlineLayoutInfo since it isn't needed, and so it isn't 6366 // transferred to the allocated InstanceKlass. 6367 if (_inline_layout_info_array != nullptr && !_layout_info->_has_inlined_fields) { 6368 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array); 6369 _inline_layout_info_array = nullptr; 6370 } 6371 6372 int injected_fields_count = _temp_field_info->length() - _java_fields_count; 6373 _fieldinfo_stream = 6374 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count, 6375 injected_fields_count, loader_data(), CHECK); 6376 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK); 6377 _fields_status = 6378 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(), 6379 FieldStatus(0), CHECK); 6380 6381 // Strict static fields track initialization status from the beginning of time. 6382 // After this class runs <clinit>, they will be verified as being "not unset". 6383 // See Step 8 of InstanceKlass::initialize_impl. 6384 if (_has_strict_static_fields) { 6385 bool found_one = false; 6386 for (int i = 0; i < _temp_field_info->length(); i++) { 6387 FieldInfo& fi = *_temp_field_info->adr_at(i); 6388 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) { 6389 found_one = true; 6390 if (fi.initializer_index() != 0) { 6391 // skip strict static fields with ConstantValue attributes 6392 } else { 6393 _fields_status->adr_at(fi.index())->update_strict_static_unset(true); 6394 _fields_status->adr_at(fi.index())->update_strict_static_unread(true); 6395 } 6396 } 6397 } 6398 assert(found_one == _has_strict_static_fields, 6399 "correct prediction = %d", (int)_has_strict_static_fields); 6400 } 6401 } 6402 6403 void ClassFileParser::set_klass(InstanceKlass* klass) { 6404 6405 #ifdef ASSERT 6406 if (klass != nullptr) { 6407 assert(nullptr == _klass, "leaking?"); 6408 } 6409 #endif 6410 6411 _klass = klass; 6412 } 6413 6414 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) { 6415 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count()); 6416 6417 // The array of InlineLayoutInfo is allocated on demand. This way the array is 6418 // never allocated for an InstanceKlass which has no need for this information. 6419 if (_inline_layout_info_array == nullptr) { 6420 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data, 6421 java_fields_count(), 6422 CHECK); 6423 } 6424 6425 // Set the Klass for the field's index 6426 _inline_layout_info_array->adr_at(field_index)->set_klass(ik); 6427 } 6428 6429 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6430 6431 #ifdef ASSERT 6432 if (klass != nullptr) { 6433 assert(nullptr == _klass_to_deallocate, "leaking?"); 6434 } 6435 #endif 6436 6437 _klass_to_deallocate = klass; 6438 } 6439 6440 // Caller responsible for ResourceMark 6441 // clone stream with rewound position 6442 const ClassFileStream* ClassFileParser::clone_stream() const { 6443 assert(_stream != nullptr, "invariant"); 6444 6445 return _stream->clone(); 6446 } 6447 6448 ReferenceType ClassFileParser::super_reference_type() const { 6449 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type(); 6450 } 6451 6452 bool ClassFileParser::is_instance_ref_klass() const { 6453 // Only the subclasses of j.l.r.Reference are InstanceRefKlass. 6454 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a 6455 // klass requiring special treatment in ref-processing. The abstract 6456 // j.l.r.Reference cannot be instantiated so doesn't partake in 6457 // ref-processing. 6458 return is_java_lang_ref_Reference_subclass(); 6459 } 6460 6461 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const { 6462 if (_super_klass == nullptr) { 6463 return false; 6464 } 6465 6466 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) { 6467 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom 6468 return true; 6469 } 6470 6471 return _super_klass->reference_type() != REF_NONE; 6472 } 6473 6474 // ---------------------------------------------------------------------------- 6475 // debugging 6476 6477 #ifdef ASSERT 6478 6479 // return true if class_name contains no '.' (internal format is '/') 6480 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6481 if (class_name != nullptr) { 6482 ResourceMark rm; 6483 char* name = class_name->as_C_string(); 6484 return strchr(name, JVM_SIGNATURE_DOT) == nullptr; 6485 } else { 6486 return true; 6487 } 6488 } 6489 6490 #endif --- EOF ---