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 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 506 break; 507 } 508 case JVM_CONSTANT_StringIndex: { 509 const int string_index = cp->string_index_at(index); 510 guarantee_property(valid_symbol_at(string_index), 511 "Invalid constant pool index %u in class file %s", 512 string_index, CHECK); 513 Symbol* const sym = cp->symbol_at(string_index); 514 cp->unresolved_string_at_put(index, sym); 515 break; 516 } 517 case JVM_CONSTANT_MethodHandle: { 518 const int ref_index = cp->method_handle_index_at(index); 519 guarantee_property(valid_cp_range(ref_index, length), 520 "Invalid constant pool index %u in class file %s", 521 ref_index, CHECK); 522 const constantTag tag = cp->tag_at(ref_index); 523 const int ref_kind = cp->method_handle_ref_kind_at(index); 524 525 switch (ref_kind) { 526 case JVM_REF_getField: 527 case JVM_REF_getStatic: 528 case JVM_REF_putField: 529 case JVM_REF_putStatic: { 530 guarantee_property( 531 tag.is_field(), 532 "Invalid constant pool index %u in class file %s (not a field)", 533 ref_index, CHECK); 534 break; 535 } 536 case JVM_REF_invokeVirtual: 537 case JVM_REF_newInvokeSpecial: { 538 guarantee_property( 539 tag.is_method(), 540 "Invalid constant pool index %u in class file %s (not a method)", 541 ref_index, CHECK); 542 break; 543 } 544 case JVM_REF_invokeStatic: 545 case JVM_REF_invokeSpecial: { 546 guarantee_property( 547 tag.is_method() || 548 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 549 "Invalid constant pool index %u in class file %s (not a method)", 550 ref_index, CHECK); 551 break; 552 } 553 case JVM_REF_invokeInterface: { 554 guarantee_property( 555 tag.is_interface_method(), 556 "Invalid constant pool index %u in class file %s (not an interface method)", 557 ref_index, CHECK); 558 break; 559 } 560 default: { 561 classfile_parse_error( 562 "Bad method handle kind at constant pool index %u in class file %s", 563 index, THREAD); 564 return; 565 } 566 } // switch(refkind) 567 // Keep the ref_index unchanged. It will be indirected at link-time. 568 break; 569 } // case MethodHandle 570 case JVM_CONSTANT_MethodType: { 571 const int ref_index = cp->method_type_index_at(index); 572 guarantee_property(valid_symbol_at(ref_index), 573 "Invalid constant pool index %u in class file %s", 574 ref_index, CHECK); 575 break; 576 } 577 case JVM_CONSTANT_Dynamic: { 578 const int name_and_type_ref_index = 579 cp->bootstrap_name_and_type_ref_index_at(index); 580 581 guarantee_property(valid_cp_range(name_and_type_ref_index, length) && 582 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 583 "Invalid constant pool index %u in class file %s", 584 name_and_type_ref_index, CHECK); 585 // bootstrap specifier index must be checked later, 586 // when BootstrapMethods attr is available 587 588 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 589 cp->set_has_dynamic_constant(); 590 break; 591 } 592 case JVM_CONSTANT_InvokeDynamic: { 593 const int name_and_type_ref_index = 594 cp->bootstrap_name_and_type_ref_index_at(index); 595 596 guarantee_property(valid_cp_range(name_and_type_ref_index, length) && 597 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 598 "Invalid constant pool index %u in class file %s", 599 name_and_type_ref_index, CHECK); 600 // bootstrap specifier index must be checked later, 601 // when BootstrapMethods attr is available 602 break; 603 } 604 default: { 605 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 606 ShouldNotReachHere(); 607 break; 608 } 609 } // switch(tag) 610 } // end of for 611 612 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK); 613 614 if (!_need_verify) { 615 return; 616 } 617 618 // second verification pass - checks the strings are of the right format. 619 // but not yet to the other entries 620 for (index = 1; index < length; index++) { 621 const jbyte tag = cp->tag_at(index).value(); 622 switch (tag) { 623 case JVM_CONSTANT_UnresolvedClass: { 624 const Symbol* const class_name = cp->klass_name_at(index); 625 // check the name 626 verify_legal_class_name(class_name, CHECK); 627 break; 628 } 629 case JVM_CONSTANT_NameAndType: { 630 if (_need_verify) { 631 const int sig_index = cp->signature_ref_index_at(index); 632 const int name_index = cp->name_ref_index_at(index); 633 const Symbol* const name = cp->symbol_at(name_index); 634 const Symbol* const sig = cp->symbol_at(sig_index); 635 guarantee_property(sig->utf8_length() != 0, 636 "Illegal zero length constant pool entry at %d in class %s", 637 sig_index, CHECK); 638 guarantee_property(name->utf8_length() != 0, 639 "Illegal zero length constant pool entry at %d in class %s", 640 name_index, CHECK); 641 642 if (Signature::is_method(sig)) { 643 // Format check method name and signature 644 verify_legal_method_name(name, CHECK); 645 verify_legal_method_signature(name, sig, CHECK); 646 } else { 647 // Format check field name and signature 648 verify_legal_field_name(name, CHECK); 649 verify_legal_field_signature(name, sig, CHECK); 650 } 651 } 652 break; 653 } 654 case JVM_CONSTANT_Dynamic: { 655 const int name_and_type_ref_index = 656 cp->uncached_name_and_type_ref_index_at(index); 657 // already verified to be utf8 658 const int name_ref_index = 659 cp->name_ref_index_at(name_and_type_ref_index); 660 // already verified to be utf8 661 const int signature_ref_index = 662 cp->signature_ref_index_at(name_and_type_ref_index); 663 const Symbol* const name = cp->symbol_at(name_ref_index); 664 const Symbol* const signature = cp->symbol_at(signature_ref_index); 665 if (_need_verify) { 666 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 667 // Need only to be sure signature is the right type. 668 if (Signature::is_method(signature)) { 669 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 670 } 671 } 672 break; 673 } 674 case JVM_CONSTANT_InvokeDynamic: 675 case JVM_CONSTANT_Fieldref: 676 case JVM_CONSTANT_Methodref: 677 case JVM_CONSTANT_InterfaceMethodref: { 678 const int name_and_type_ref_index = 679 cp->uncached_name_and_type_ref_index_at(index); 680 // already verified to be utf8 681 const int name_ref_index = 682 cp->name_ref_index_at(name_and_type_ref_index); 683 // already verified to be utf8 684 const int signature_ref_index = 685 cp->signature_ref_index_at(name_and_type_ref_index); 686 const Symbol* const name = cp->symbol_at(name_ref_index); 687 const Symbol* const signature = cp->symbol_at(signature_ref_index); 688 if (tag == JVM_CONSTANT_Fieldref) { 689 if (_need_verify) { 690 // Field name and signature are verified above, when iterating NameAndType_info. 691 // Need only to be sure signature is non-zero length and the right type. 692 if (Signature::is_method(signature)) { 693 throwIllegalSignature("Field", name, signature, CHECK); 694 } 695 } 696 } else { 697 if (_need_verify) { 698 // Method name and signature are individually verified above, when iterating 699 // NameAndType_info. Need to check here that signature is non-zero length and 700 // the right type. 701 if (!Signature::is_method(signature)) { 702 throwIllegalSignature("Method", name, signature, CHECK); 703 } 704 } 705 // If a class method name begins with '<', it must be "<init>" and have void signature. 706 const unsigned int name_len = name->utf8_length(); 707 if (tag == JVM_CONSTANT_Methodref && name_len != 0 && 708 name->char_at(0) == JVM_SIGNATURE_SPECIAL) { 709 if (name != vmSymbols::object_initializer_name()) { 710 classfile_parse_error( 711 "Bad method name at constant pool index %u in class file %s", 712 name_ref_index, THREAD); 713 return; 714 } else if (!Signature::is_void_method(signature)) { // must have void signature. 715 throwIllegalSignature("Method", name, signature, CHECK); 716 } 717 } 718 } 719 break; 720 } 721 case JVM_CONSTANT_MethodHandle: { 722 const int ref_index = cp->method_handle_index_at(index); 723 const int ref_kind = cp->method_handle_ref_kind_at(index); 724 switch (ref_kind) { 725 case JVM_REF_invokeVirtual: 726 case JVM_REF_invokeStatic: 727 case JVM_REF_invokeSpecial: 728 case JVM_REF_newInvokeSpecial: { 729 const int name_and_type_ref_index = 730 cp->uncached_name_and_type_ref_index_at(ref_index); 731 const int name_ref_index = 732 cp->name_ref_index_at(name_and_type_ref_index); 733 const Symbol* const name = cp->symbol_at(name_ref_index); 734 if (ref_kind == JVM_REF_newInvokeSpecial) { 735 if (name != vmSymbols::object_initializer_name()) { 736 classfile_parse_error( 737 "Bad constructor name at constant pool index %u in class file %s", 738 name_ref_index, THREAD); 739 return; 740 } 741 } else { 742 if (name == vmSymbols::object_initializer_name()) { 743 classfile_parse_error( 744 "Bad method name at constant pool index %u in class file %s", 745 name_ref_index, THREAD); 746 return; 747 } 748 } 749 break; 750 } 751 // Other ref_kinds are already fully checked in previous pass. 752 } // switch(ref_kind) 753 break; 754 } 755 case JVM_CONSTANT_MethodType: { 756 const Symbol* const no_name = vmSymbols::type_name(); // place holder 757 const Symbol* const signature = cp->method_type_signature_at(index); 758 verify_legal_method_signature(no_name, signature, CHECK); 759 break; 760 } 761 case JVM_CONSTANT_Utf8: { 762 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 763 } 764 } // switch(tag) 765 } // end of for 766 } 767 768 class NameSigHash: public ResourceObj { 769 public: 770 const Symbol* _name; // name 771 const Symbol* _sig; // signature 772 773 static const int HASH_ROW_SIZE = 256; 774 775 NameSigHash(Symbol* name, Symbol* sig) : 776 _name(name), 777 _sig(sig) {} 778 779 static unsigned int hash(NameSigHash const& namesig) { 780 return namesig._name->identity_hash() ^ namesig._sig->identity_hash(); 781 } 782 783 static bool equals(NameSigHash const& e0, NameSigHash const& e1) { 784 return (e0._name == e1._name) && 785 (e0._sig == e1._sig); 786 } 787 }; 788 789 using NameSigHashtable = HashTable<NameSigHash, int, 790 NameSigHash::HASH_ROW_SIZE, 791 AnyObj::RESOURCE_AREA, mtInternal, 792 &NameSigHash::hash, &NameSigHash::equals>; 793 794 // Side-effects: populates the _local_interfaces field 795 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 796 const int itfs_len, 797 ConstantPool* const cp, 798 bool* const has_nonstatic_concrete_methods, 799 TRAPS) { 800 assert(stream != nullptr, "invariant"); 801 assert(cp != nullptr, "invariant"); 802 assert(has_nonstatic_concrete_methods != nullptr, "invariant"); 803 804 if (itfs_len == 0) { 805 _local_interfaces = Universe::the_empty_instance_klass_array(); 806 } else { 807 assert(itfs_len > 0, "only called for len>0"); 808 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK); 809 810 int index; 811 for (index = 0; index < itfs_len; index++) { 812 const u2 interface_index = stream->get_u2(CHECK); 813 Klass* interf; 814 guarantee_property( 815 valid_klass_reference_at(interface_index), 816 "Interface name has bad constant pool index %u in class file %s", 817 interface_index, CHECK); 818 if (cp->tag_at(interface_index).is_klass()) { 819 interf = cp->resolved_klass_at(interface_index); 820 } else { 821 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 822 823 // Don't need to check legal name because it's checked when parsing constant pool. 824 // But need to make sure it's not an array type. 825 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 826 "Bad interface name in class file %s", CHECK); 827 828 // Call resolve on the interface class name with class circularity checking 829 interf = SystemDictionary::resolve_super_or_fail(_class_name, 830 unresolved_klass, 831 Handle(THREAD, _loader_data->class_loader()), 832 false, CHECK); 833 } 834 835 if (!interf->is_interface()) { 836 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 837 err_msg("class %s can not implement %s, because it is not an interface (%s)", 838 _class_name->as_klass_external_name(), 839 interf->external_name(), 840 interf->class_in_module_of_loader())); 841 } 842 843 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 844 *has_nonstatic_concrete_methods = true; 845 } 846 _local_interfaces->at_put(index, InstanceKlass::cast(interf)); 847 } 848 849 if (!_need_verify || itfs_len <= 1) { 850 return; 851 } 852 853 // Check if there's any duplicates in interfaces 854 ResourceMark rm(THREAD); 855 // Set containing interface names 856 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>(); 857 for (index = 0; index < itfs_len; index++) { 858 const InstanceKlass* const k = _local_interfaces->at(index); 859 Symbol* interface_name = k->name(); 860 // If no duplicates, add (name, nullptr) in hashtable interface_names. 861 if (!interface_names->put(interface_name, 0)) { 862 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 863 interface_name->as_C_string(), THREAD); 864 return; 865 } 866 } 867 } 868 } 869 870 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 871 int constantvalue_index, 872 int signature_index, 873 TRAPS) const { 874 // Make sure the constant pool entry is of a type appropriate to this field 875 guarantee_property( 876 (constantvalue_index > 0 && 877 constantvalue_index < cp->length()), 878 "Bad initial value index %u in ConstantValue attribute in class file %s", 879 constantvalue_index, CHECK); 880 881 const constantTag value_type = cp->tag_at(constantvalue_index); 882 switch(cp->basic_type_for_signature_at(signature_index)) { 883 case T_LONG: { 884 guarantee_property(value_type.is_long(), 885 "Inconsistent constant value type in class file %s", 886 CHECK); 887 break; 888 } 889 case T_FLOAT: { 890 guarantee_property(value_type.is_float(), 891 "Inconsistent constant value type in class file %s", 892 CHECK); 893 break; 894 } 895 case T_DOUBLE: { 896 guarantee_property(value_type.is_double(), 897 "Inconsistent constant value type in class file %s", 898 CHECK); 899 break; 900 } 901 case T_BYTE: 902 case T_CHAR: 903 case T_SHORT: 904 case T_BOOLEAN: 905 case T_INT: { 906 guarantee_property(value_type.is_int(), 907 "Inconsistent constant value type in class file %s", 908 CHECK); 909 break; 910 } 911 case T_OBJECT: { 912 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 913 && value_type.is_string()), 914 "Bad string initial value in class file %s", 915 CHECK); 916 break; 917 } 918 default: { 919 classfile_parse_error("Unable to set initial value %u in class file %s", 920 constantvalue_index, 921 THREAD); 922 } 923 } 924 } 925 926 class AnnotationCollector : public ResourceObj{ 927 public: 928 enum Location { _in_field, _in_method, _in_class }; 929 enum ID { 930 _unknown = 0, 931 _method_CallerSensitive, 932 _method_ForceInline, 933 _method_DontInline, 934 _method_ChangesCurrentThread, 935 _method_JvmtiHideEvents, 936 _method_JvmtiMountTransition, 937 _method_InjectedProfile, 938 _method_LambdaForm_Compiled, 939 _method_Hidden, 940 _method_Scoped, 941 _method_IntrinsicCandidate, 942 _jdk_internal_vm_annotation_Contended, 943 _field_Stable, 944 _jdk_internal_vm_annotation_ReservedStackAccess, 945 _jdk_internal_ValueBased, 946 _jdk_internal_LooselyConsistentValue, 947 _jdk_internal_NullRestricted, 948 _java_lang_Deprecated, 949 _java_lang_Deprecated_for_removal, 950 _jdk_internal_vm_annotation_AOTSafeClassInitializer, 951 _method_AOTRuntimeSetup, 952 _jdk_internal_vm_annotation_TrustFinalFields, 953 _annotation_LIMIT 954 }; 955 const Location _location; 956 int _annotations_present; 957 u2 _contended_group; 958 959 AnnotationCollector(Location location) 960 : _location(location), _annotations_present(0), _contended_group(0) 961 { 962 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 963 } 964 // If this annotation name has an ID, report it (or _none). 965 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations); 966 // Set the annotation name: 967 void set_annotation(ID id) { 968 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 969 _annotations_present |= (int)nth_bit((int)id); 970 } 971 972 void remove_annotation(ID id) { 973 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 974 _annotations_present &= (int)~nth_bit((int)id); 975 } 976 977 // Report if the annotation is present. 978 bool has_any_annotations() const { return _annotations_present != 0; } 979 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 980 981 void set_contended_group(u2 group) { _contended_group = group; } 982 u2 contended_group() const { return _contended_group; } 983 984 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 985 986 void set_stable(bool stable) { set_annotation(_field_Stable); } 987 bool is_stable() const { return has_annotation(_field_Stable); } 988 989 bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); } 990 }; 991 992 // This class also doubles as a holder for metadata cleanup. 993 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 994 private: 995 ClassLoaderData* _loader_data; 996 AnnotationArray* _field_annotations; 997 AnnotationArray* _field_type_annotations; 998 public: 999 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1000 AnnotationCollector(_in_field), 1001 _loader_data(loader_data), 1002 _field_annotations(nullptr), 1003 _field_type_annotations(nullptr) {} 1004 ~FieldAnnotationCollector(); 1005 void apply_to(FieldInfo* f); 1006 AnnotationArray* field_annotations() { return _field_annotations; } 1007 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1008 1009 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1010 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1011 }; 1012 1013 class MethodAnnotationCollector : public AnnotationCollector{ 1014 public: 1015 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1016 void apply_to(const methodHandle& m); 1017 }; 1018 1019 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1020 public: 1021 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1022 void apply_to(InstanceKlass* ik); 1023 }; 1024 1025 1026 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth); // fwd decl 1027 static const int max_recursion_depth = 5; 1028 1029 // Safely increment index by val if does not pass limit 1030 #define SAFE_ADD(index, limit, val) \ 1031 if (index >= limit - val) return limit; \ 1032 index += val; 1033 1034 // Skip an annotation. Return >=limit if there is any problem. 1035 static int skip_annotation(const u1* buffer, int limit, int index, int recursion_depth = 0) { 1036 assert(buffer != nullptr, "invariant"); 1037 if (recursion_depth > max_recursion_depth) { 1038 return limit; 1039 } 1040 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1041 // value := switch (tag:u1) { ... } 1042 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1043 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1044 while (--nmem >= 0 && index < limit) { 1045 SAFE_ADD(index, limit, 2); // skip member 1046 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1); 1047 } 1048 return index; 1049 } 1050 1051 // Skip an annotation value. Return >=limit if there is any problem. 1052 static int skip_annotation_value(const u1* buffer, int limit, int index, int recursion_depth) { 1053 assert(buffer != nullptr, "invariant"); 1054 1055 if (recursion_depth > max_recursion_depth) { 1056 return limit; 1057 } 1058 // value := switch (tag:u1) { 1059 // case B, C, I, S, Z, D, F, J, c: con:u2; 1060 // case e: e_class:u2 e_name:u2; 1061 // case s: s_con:u2; 1062 // case [: do(nval:u2) {value}; 1063 // case @: annotation; 1064 // case s: s_con:u2; 1065 // } 1066 SAFE_ADD(index, limit, 1); // read tag 1067 const u1 tag = buffer[index - 1]; 1068 switch (tag) { 1069 case 'B': 1070 case 'C': 1071 case 'I': 1072 case 'S': 1073 case 'Z': 1074 case 'D': 1075 case 'F': 1076 case 'J': 1077 case 'c': 1078 case 's': 1079 SAFE_ADD(index, limit, 2); // skip con or s_con 1080 break; 1081 case 'e': 1082 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1083 break; 1084 case '[': 1085 { 1086 SAFE_ADD(index, limit, 2); // read nval 1087 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1088 while (--nval >= 0 && index < limit) { 1089 index = skip_annotation_value(buffer, limit, index, recursion_depth + 1); 1090 } 1091 } 1092 break; 1093 case '@': 1094 index = skip_annotation(buffer, limit, index, recursion_depth + 1); 1095 break; 1096 default: 1097 return limit; // bad tag byte 1098 } 1099 return index; 1100 } 1101 1102 // Sift through annotations, looking for those significant to the VM: 1103 static void parse_annotations(const ConstantPool* const cp, 1104 const u1* buffer, int limit, 1105 AnnotationCollector* coll, 1106 ClassLoaderData* loader_data, 1107 const bool can_access_vm_annotations) { 1108 1109 assert(cp != nullptr, "invariant"); 1110 assert(buffer != nullptr, "invariant"); 1111 assert(coll != nullptr, "invariant"); 1112 assert(loader_data != nullptr, "invariant"); 1113 1114 // annotations := do(nann:u2) {annotation} 1115 int index = 2; // read nann 1116 if (index >= limit) return; 1117 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1118 enum { // initial annotation layout 1119 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1120 count_off = 2, // u2 such as 1 (one value) 1121 member_off = 4, // utf8 such as 'value' 1122 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1123 e_tag_val = 'e', 1124 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1125 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1126 e_size = 11, // end of 'e' annotation 1127 c_tag_val = 'c', // payload is type 1128 c_con_off = 7, // utf8 payload, such as 'I' 1129 c_size = 9, // end of 'c' annotation 1130 s_tag_val = 's', // payload is String 1131 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1132 s_size = 9, 1133 b_tag_val = 'Z', // payload is boolean 1134 min_size = 6 // smallest possible size (zero members) 1135 }; 1136 // Cannot add min_size to index in case of overflow MAX_INT 1137 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1138 int index0 = index; 1139 index = skip_annotation(buffer, limit, index); 1140 const u1* const abase = buffer + index0; 1141 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1142 const int count = Bytes::get_Java_u2((address)abase + count_off); 1143 const Symbol* const aname = check_symbol_at(cp, atype); 1144 if (aname == nullptr) break; // invalid annotation name 1145 const Symbol* member = nullptr; 1146 if (count >= 1) { 1147 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1148 member = check_symbol_at(cp, member_index); 1149 if (member == nullptr) break; // invalid member name 1150 } 1151 1152 // Here is where parsing particular annotations will take place. 1153 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations); 1154 if (AnnotationCollector::_unknown == id) continue; 1155 coll->set_annotation(id); 1156 if (AnnotationCollector::_java_lang_Deprecated == id) { 1157 // @Deprecated can specify forRemoval=true, which we need 1158 // to record for JFR to use. If the annotation is not well-formed 1159 // then we may not be able to determine that. 1160 const u1* offset = abase + member_off; 1161 // There are only 2 members in @Deprecated. 1162 int n_members = MIN2(count, 2); 1163 for (int i = 0; i < n_members; ++i) { 1164 int member_index = Bytes::get_Java_u2((address)offset); 1165 offset += 2; 1166 member = check_symbol_at(cp, member_index); 1167 if (member == vmSymbols::since() && 1168 (*((address)offset) == s_tag_val)) { 1169 // Found `since` first so skip over it 1170 offset += 3; 1171 } 1172 else if (member == vmSymbols::for_removal() && 1173 (*((address)offset) == b_tag_val)) { 1174 const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1); 1175 // No guarantee the entry is valid so check it refers to an int in the CP. 1176 if (cp->is_within_bounds(boolean_value_index) && 1177 cp->tag_at(boolean_value_index).is_int() && 1178 cp->int_at(boolean_value_index) == 1) { 1179 // forRemoval == true 1180 coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal); 1181 } 1182 break; // no need to check further 1183 } 1184 else { 1185 // This @Deprecated annotation is malformed so we don't try to 1186 // determine whether forRemoval is set. 1187 break; 1188 } 1189 } 1190 continue; // proceed to next annotation 1191 } 1192 1193 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1194 // @Contended can optionally specify the contention group. 1195 // 1196 // Contended group defines the equivalence class over the fields: 1197 // the fields within the same contended group are not treated distinct. 1198 // The only exception is default group, which does not incur the 1199 // equivalence. Naturally, contention group for classes is meaningless. 1200 // 1201 // While the contention group is specified as String, annotation 1202 // values are already interned, and we might as well use the constant 1203 // pool index as the group tag. 1204 // 1205 u2 group_index = 0; // default contended group 1206 if (count == 1 1207 && s_size == (index - index0) // match size 1208 && s_tag_val == *(abase + tag_off) 1209 && member == vmSymbols::value_name()) { 1210 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1211 // No guarantee the group_index is valid so check it refers to a 1212 // symbol in the CP. 1213 if (cp->is_within_bounds(group_index) && 1214 cp->tag_at(group_index).is_utf8()) { 1215 // Seems valid, so check for empty string and reset 1216 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1217 group_index = 0; // default contended group 1218 } 1219 } else { 1220 // Not valid so use the default 1221 group_index = 0; 1222 } 1223 } 1224 coll->set_contended_group(group_index); 1225 continue; // proceed to next annotation 1226 } 1227 } 1228 } 1229 1230 1231 // Parse attributes for a field. 1232 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1233 u2 attributes_count, 1234 bool is_static, u2 signature_index, 1235 u2* const constantvalue_index_addr, 1236 bool* const is_synthetic_addr, 1237 u2* const generic_signature_index_addr, 1238 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1239 TRAPS) { 1240 assert(cfs != nullptr, "invariant"); 1241 assert(constantvalue_index_addr != nullptr, "invariant"); 1242 assert(is_synthetic_addr != nullptr, "invariant"); 1243 assert(generic_signature_index_addr != nullptr, "invariant"); 1244 assert(parsed_annotations != nullptr, "invariant"); 1245 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1246 1247 u2 constantvalue_index = 0; 1248 u2 generic_signature_index = 0; 1249 bool is_synthetic = false; 1250 const u1* runtime_visible_annotations = nullptr; 1251 int runtime_visible_annotations_length = 0; 1252 const u1* runtime_visible_type_annotations = nullptr; 1253 int runtime_visible_type_annotations_length = 0; 1254 bool runtime_invisible_annotations_exists = false; 1255 bool runtime_invisible_type_annotations_exists = false; 1256 const ConstantPool* const cp = _cp; 1257 1258 while (attributes_count--) { 1259 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1260 const u2 attribute_name_index = cfs->get_u2_fast(); 1261 const u4 attribute_length = cfs->get_u4_fast(); 1262 guarantee_property(valid_symbol_at(attribute_name_index), 1263 "Invalid field attribute index %u in class file %s", 1264 attribute_name_index, 1265 CHECK); 1266 1267 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1268 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1269 // ignore if non-static 1270 if (constantvalue_index != 0) { 1271 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD); 1272 return; 1273 } 1274 guarantee_property( 1275 attribute_length == 2, 1276 "Invalid ConstantValue field attribute length %u in class file %s", 1277 attribute_length, CHECK); 1278 1279 constantvalue_index = cfs->get_u2(CHECK); 1280 if (_need_verify) { 1281 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1282 } 1283 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1284 if (attribute_length != 0) { 1285 classfile_parse_error( 1286 "Invalid Synthetic field attribute length %u in class file %s", 1287 attribute_length, THREAD); 1288 return; 1289 } 1290 is_synthetic = true; 1291 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1292 if (attribute_length != 0) { 1293 classfile_parse_error( 1294 "Invalid Deprecated field attribute length %u in class file %s", 1295 attribute_length, THREAD); 1296 return; 1297 } 1298 } else if (_major_version >= JAVA_1_5_VERSION) { 1299 if (attribute_name == vmSymbols::tag_signature()) { 1300 if (generic_signature_index != 0) { 1301 classfile_parse_error( 1302 "Multiple Signature attributes for field in class file %s", THREAD); 1303 return; 1304 } 1305 if (attribute_length != 2) { 1306 classfile_parse_error( 1307 "Wrong size %u for field's Signature attribute in class file %s", 1308 attribute_length, THREAD); 1309 return; 1310 } 1311 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1312 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1313 if (runtime_visible_annotations != nullptr) { 1314 classfile_parse_error( 1315 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD); 1316 return; 1317 } 1318 runtime_visible_annotations_length = attribute_length; 1319 runtime_visible_annotations = cfs->current(); 1320 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 1321 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1322 parse_annotations(cp, 1323 runtime_visible_annotations, 1324 runtime_visible_annotations_length, 1325 parsed_annotations, 1326 _loader_data, 1327 _can_access_vm_annotations); 1328 cfs->skip_u1_fast(runtime_visible_annotations_length); 1329 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1330 if (runtime_invisible_annotations_exists) { 1331 classfile_parse_error( 1332 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD); 1333 return; 1334 } 1335 runtime_invisible_annotations_exists = true; 1336 cfs->skip_u1(attribute_length, CHECK); 1337 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1338 if (runtime_visible_type_annotations != nullptr) { 1339 classfile_parse_error( 1340 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD); 1341 return; 1342 } 1343 runtime_visible_type_annotations_length = attribute_length; 1344 runtime_visible_type_annotations = cfs->current(); 1345 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 1346 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1347 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1348 if (runtime_invisible_type_annotations_exists) { 1349 classfile_parse_error( 1350 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD); 1351 return; 1352 } else { 1353 runtime_invisible_type_annotations_exists = true; 1354 } 1355 cfs->skip_u1(attribute_length, CHECK); 1356 } else { 1357 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1358 } 1359 } else { 1360 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1361 } 1362 } 1363 1364 *constantvalue_index_addr = constantvalue_index; 1365 *is_synthetic_addr = is_synthetic; 1366 *generic_signature_index_addr = generic_signature_index; 1367 AnnotationArray* a = allocate_annotations(runtime_visible_annotations, 1368 runtime_visible_annotations_length, 1369 CHECK); 1370 parsed_annotations->set_field_annotations(a); 1371 a = allocate_annotations(runtime_visible_type_annotations, 1372 runtime_visible_type_annotations_length, 1373 CHECK); 1374 parsed_annotations->set_field_type_annotations(a); 1375 return; 1376 } 1377 1378 1379 // Side-effects: populates the _fields, _fields_annotations, 1380 // _fields_type_annotations fields 1381 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1382 AccessFlags class_access_flags, 1383 ConstantPool* cp, 1384 const int cp_size, 1385 u2* const java_fields_count_ptr, 1386 TRAPS) { 1387 1388 assert(cfs != nullptr, "invariant"); 1389 assert(cp != nullptr, "invariant"); 1390 assert(java_fields_count_ptr != nullptr, "invariant"); 1391 1392 assert(nullptr == _fields_annotations, "invariant"); 1393 assert(nullptr == _fields_type_annotations, "invariant"); 1394 1395 // "inline type" means concrete value class 1396 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract(); 1397 // "value class" can be either abstract or concrete value class 1398 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface(); 1399 cfs->guarantee_more(2, CHECK); // length 1400 const u2 length = cfs->get_u2_fast(); 1401 *java_fields_count_ptr = length; 1402 1403 int num_injected = 0; 1404 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1405 &num_injected); 1406 1407 // Two more slots are required for inline classes: 1408 // - The static field ".null_reset" which carries the nullable flat layout 1409 // representation of null, added below 1410 // - The nonstatic field ".empty" the JVM injects when detecting an empty 1411 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout 1412 // One more slot is required for both abstract value class and inline classes: 1413 // - The static field ".acmp_maps" for acmp and identity hash, tracks 1414 // nonstatic fields both inherited or declared, added below 1415 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0) 1416 + (is_value_class ? 1 : 0); 1417 1418 // Allocate a temporary resource array to collect field data. 1419 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream. 1420 _temp_field_info = new GrowableArray<FieldInfo>(total_fields); 1421 1422 ResourceMark rm(THREAD); 1423 for (int n = 0; n < length; n++) { 1424 // access_flags, name_index, descriptor_index, attributes_count 1425 cfs->guarantee_more(8, CHECK); 1426 1427 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS; 1428 if (!supports_inline_types()) { 1429 recognized_modifiers &= ~JVM_ACC_STRICT_INIT; 1430 } 1431 1432 const jint flags = cfs->get_u2_fast() & recognized_modifiers; 1433 verify_legal_field_modifiers(flags, class_access_flags, CHECK); 1434 AccessFlags access_flags; 1435 access_flags.set_flags(flags); 1436 FieldInfo::FieldFlags fieldFlags(0); 1437 1438 const u2 name_index = cfs->get_u2_fast(); 1439 guarantee_property(valid_symbol_at(name_index), 1440 "Invalid constant pool index %u for field name in class file %s", 1441 name_index, CHECK); 1442 const Symbol* const name = cp->symbol_at(name_index); 1443 verify_legal_field_name(name, CHECK); 1444 1445 const u2 signature_index = cfs->get_u2_fast(); 1446 guarantee_property(valid_symbol_at(signature_index), 1447 "Invalid constant pool index %u for field signature in class file %s", 1448 signature_index, CHECK); 1449 const Symbol* const sig = cp->symbol_at(signature_index); 1450 verify_legal_field_signature(name, sig, CHECK); 1451 1452 u2 constantvalue_index = 0; 1453 bool is_synthetic = false; 1454 u2 generic_signature_index = 0; 1455 const bool is_static = access_flags.is_static(); 1456 FieldAnnotationCollector parsed_annotations(_loader_data); 1457 1458 bool is_null_restricted = false; 1459 1460 const u2 attributes_count = cfs->get_u2_fast(); 1461 if (attributes_count > 0) { 1462 parse_field_attributes(cfs, 1463 attributes_count, 1464 is_static, 1465 signature_index, 1466 &constantvalue_index, 1467 &is_synthetic, 1468 &generic_signature_index, 1469 &parsed_annotations, 1470 CHECK); 1471 1472 if (parsed_annotations.field_annotations() != nullptr) { 1473 if (_fields_annotations == nullptr) { 1474 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1475 _loader_data, length, nullptr, 1476 CHECK); 1477 } 1478 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1479 parsed_annotations.set_field_annotations(nullptr); 1480 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) { 1481 if (!Signature::has_envelope(sig)) { 1482 Exceptions::fthrow( 1483 THREAD_AND_LOCATION, 1484 vmSymbols::java_lang_ClassFormatError(), 1485 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)", 1486 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string()); 1487 return; 1488 } 1489 if (!supports_inline_types()) { 1490 Exceptions::fthrow( 1491 THREAD_AND_LOCATION, 1492 vmSymbols::java_lang_ClassFormatError(), 1493 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file", 1494 class_name()->as_C_string(), name->as_C_string()); 1495 return; 1496 } 1497 1498 if ((flags & JVM_ACC_STRICT_INIT) == 0) { 1499 // Inject STRICT_INIT and validate in context 1500 const jint patched_flags = flags | JVM_ACC_STRICT_INIT; 1501 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK); 1502 access_flags.set_flags(patched_flags); 1503 } 1504 is_null_restricted = true; 1505 } 1506 } 1507 if (parsed_annotations.field_type_annotations() != nullptr) { 1508 if (_fields_type_annotations == nullptr) { 1509 _fields_type_annotations = 1510 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1511 length, 1512 nullptr, 1513 CHECK); 1514 } 1515 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1516 parsed_annotations.set_field_type_annotations(nullptr); 1517 } 1518 1519 if (is_synthetic) { 1520 access_flags.set_is_synthetic(); 1521 } 1522 if (generic_signature_index != 0) { 1523 fieldFlags.update_generic(true); 1524 } 1525 } 1526 1527 if (is_null_restricted) { 1528 fieldFlags.update_null_free_inline_type(true); 1529 } 1530 1531 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1532 1533 // Update number of static oop fields. 1534 if (is_static && is_reference_type(type)) { 1535 _static_oop_count++; 1536 } 1537 1538 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags); 1539 fi.set_index(n); 1540 if (fieldFlags.is_generic()) { 1541 fi.set_generic_signature_index(generic_signature_index); 1542 } 1543 parsed_annotations.apply_to(&fi); 1544 if (fi.field_flags().is_contended()) { 1545 _has_contended_fields = true; 1546 } 1547 if (access_flags.is_strict() && access_flags.is_static()) { 1548 _has_strict_static_fields = true; 1549 } 1550 _temp_field_info->append(fi); 1551 } 1552 assert(_temp_field_info->length() == length, "Must be"); 1553 1554 if (num_injected != 0) { 1555 for (int n = 0; n < num_injected; n++) { 1556 // Check for duplicates 1557 if (injected[n].may_be_java) { 1558 const Symbol* const name = injected[n].name(); 1559 const Symbol* const signature = injected[n].signature(); 1560 bool duplicate = false; 1561 for (int i = 0; i < length; i++) { 1562 const FieldInfo* const f = _temp_field_info->adr_at(i); 1563 if (name == cp->symbol_at(f->name_index()) && 1564 signature == cp->symbol_at(f->signature_index())) { 1565 // Symbol is desclared in Java so skip this one 1566 duplicate = true; 1567 break; 1568 } 1569 } 1570 if (duplicate) { 1571 // These will be removed from the field array at the end 1572 continue; 1573 } 1574 } 1575 1576 // Injected field 1577 FieldInfo::FieldFlags fflags(0); 1578 fflags.update_injected(true); 1579 AccessFlags aflags; 1580 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags); 1581 int idx = _temp_field_info->append(fi); 1582 _temp_field_info->adr_at(idx)->set_index(idx); 1583 } 1584 } 1585 1586 if (is_inline_type) { 1587 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero. 1588 // It should never be seen by user code, it is used when writing "null" to a nullable flat field 1589 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects 1590 // alive. 1591 FieldInfo::FieldFlags fflags2(0); 1592 fflags2.update_injected(true); 1593 AccessFlags aflags2(JVM_ACC_STATIC); 1594 FieldInfo fi2(aflags2, 1595 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)), 1596 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)), 1597 0, 1598 fflags2); 1599 int idx2 = _temp_field_info->append(fi2); 1600 _temp_field_info->adr_at(idx2)->set_index(idx2); 1601 _static_oop_count++; 1602 } 1603 if (!access_flags().is_identity_class() && !access_flags().is_interface() 1604 && _class_name != vmSymbols::java_lang_Object()) { 1605 // Acmp map ".acmp_maps" required for abstract and concrete value classes 1606 FieldInfo::FieldFlags fflags2(0); 1607 fflags2.update_injected(true); 1608 fflags2.update_stable(true); 1609 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL); 1610 FieldInfo fi3(aflags2, 1611 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)), 1612 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)), 1613 0, 1614 fflags2); 1615 int idx2 = _temp_field_info->append(fi3); 1616 _temp_field_info->adr_at(idx2)->set_index(idx2); 1617 _static_oop_count++; 1618 } 1619 1620 if (_need_verify && length > 1) { 1621 // Check duplicated fields 1622 ResourceMark rm(THREAD); 1623 // Set containing name-signature pairs 1624 NameSigHashtable* names_and_sigs = new NameSigHashtable(); 1625 for (int i = 0; i < _temp_field_info->length(); i++) { 1626 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp), 1627 _temp_field_info->adr_at(i)->signature(_cp)); 1628 // If no duplicates, add name/signature in hashtable names_and_sigs. 1629 if(!names_and_sigs->put(name_and_sig, 0)) { 1630 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1631 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); 1632 return; 1633 } 1634 } 1635 } 1636 } 1637 1638 1639 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1640 u4 code_length, 1641 u4 exception_table_length, 1642 TRAPS) { 1643 assert(cfs != nullptr, "invariant"); 1644 1645 const unsafe_u2* const exception_table_start = cfs->current(); 1646 assert(exception_table_start != nullptr, "null exception table"); 1647 1648 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1649 // end_pc, 1650 // handler_pc, 1651 // catch_type_index 1652 1653 // Will check legal target after parsing code array in verifier. 1654 if (_need_verify) { 1655 for (unsigned int i = 0; i < exception_table_length; i++) { 1656 const u2 start_pc = cfs->get_u2_fast(); 1657 const u2 end_pc = cfs->get_u2_fast(); 1658 const u2 handler_pc = cfs->get_u2_fast(); 1659 const u2 catch_type_index = cfs->get_u2_fast(); 1660 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1661 "Illegal exception table range in class file %s", 1662 CHECK_NULL); 1663 guarantee_property(handler_pc < code_length, 1664 "Illegal exception table handler in class file %s", 1665 CHECK_NULL); 1666 if (catch_type_index != 0) { 1667 guarantee_property(valid_klass_reference_at(catch_type_index), 1668 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1669 } 1670 } 1671 } else { 1672 cfs->skip_u2_fast(exception_table_length * 4); 1673 } 1674 return exception_table_start; 1675 } 1676 1677 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1678 u4 code_length, 1679 CompressedLineNumberWriteStream**const write_stream, 1680 TRAPS) { 1681 1682 const ClassFileStream* const cfs = _stream; 1683 unsigned int num_entries = cfs->get_u2(CHECK); 1684 1685 // Each entry is a u2 start_pc, and a u2 line_number 1686 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1687 1688 // Verify line number attribute and table length 1689 guarantee_property( 1690 code_attribute_length == sizeof(u2) + length_in_bytes, 1691 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1692 1693 cfs->guarantee_more(length_in_bytes, CHECK); 1694 1695 if ((*write_stream) == nullptr) { 1696 if (length_in_bytes > fixed_buffer_size) { 1697 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1698 } else { 1699 (*write_stream) = new CompressedLineNumberWriteStream( 1700 _linenumbertable_buffer, fixed_buffer_size); 1701 } 1702 } 1703 1704 while (num_entries-- > 0) { 1705 const u2 bci = cfs->get_u2_fast(); // start_pc 1706 const u2 line = cfs->get_u2_fast(); // line_number 1707 guarantee_property(bci < code_length, 1708 "Invalid pc in LineNumberTable in class file %s", CHECK); 1709 (*write_stream)->write_pair(bci, line); 1710 } 1711 } 1712 1713 1714 class LVT_Hash : public AllStatic { 1715 public: 1716 1717 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1718 /* 1719 * 3-tuple start_bci/length/slot has to be unique key, 1720 * so the following comparison seems to be redundant: 1721 * && elem->name_cp_index == entry->_elem->name_cp_index 1722 */ 1723 return (e0.start_bci == e1.start_bci && 1724 e0.length == e1.length && 1725 e0.name_cp_index == e1.name_cp_index && 1726 e0.slot == e1.slot); 1727 } 1728 1729 static unsigned int hash(LocalVariableTableElement const& e0) { 1730 unsigned int raw_hash = e0.start_bci; 1731 1732 raw_hash = e0.length + raw_hash * 37; 1733 raw_hash = e0.name_cp_index + raw_hash * 37; 1734 raw_hash = e0.slot + raw_hash * 37; 1735 1736 return raw_hash; 1737 } 1738 }; 1739 1740 1741 // Class file LocalVariableTable elements. 1742 class Classfile_LVT_Element { 1743 public: 1744 u2 start_bci; 1745 u2 length; 1746 u2 name_cp_index; 1747 u2 descriptor_cp_index; 1748 u2 slot; 1749 }; 1750 1751 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1752 LocalVariableTableElement* const lvt) { 1753 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1754 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1755 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1756 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1757 lvt->signature_cp_index = 0; 1758 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1759 } 1760 1761 // Function is used to parse both attributes: 1762 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1763 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1764 u4 code_length, 1765 u2 max_locals, 1766 u4 code_attribute_length, 1767 u2* const localvariable_table_length, 1768 bool isLVTT, 1769 TRAPS) { 1770 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1771 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1772 const unsigned int size = checked_cast<unsigned>( 1773 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2)); 1774 1775 const ConstantPool* const cp = _cp; 1776 1777 // Verify local variable table attribute has right length 1778 if (_need_verify) { 1779 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1780 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1781 } 1782 1783 const unsafe_u2* const localvariable_table_start = cfs->current(); 1784 assert(localvariable_table_start != nullptr, "null local variable table"); 1785 if (!_need_verify) { 1786 cfs->skip_u2_fast(size); 1787 } else { 1788 cfs->guarantee_more(size * 2, CHECK_NULL); 1789 for(int i = 0; i < (*localvariable_table_length); i++) { 1790 const u2 start_pc = cfs->get_u2_fast(); 1791 const u2 length = cfs->get_u2_fast(); 1792 const u2 name_index = cfs->get_u2_fast(); 1793 const u2 descriptor_index = cfs->get_u2_fast(); 1794 const u2 index = cfs->get_u2_fast(); 1795 // Assign to a u4 to avoid overflow 1796 const u4 end_pc = (u4)start_pc + (u4)length; 1797 1798 if (start_pc >= code_length) { 1799 classfile_parse_error( 1800 "Invalid start_pc %u in %s in class file %s", 1801 start_pc, tbl_name, THREAD); 1802 return nullptr; 1803 } 1804 if (end_pc > code_length) { 1805 classfile_parse_error( 1806 "Invalid length %u in %s in class file %s", 1807 length, tbl_name, THREAD); 1808 return nullptr; 1809 } 1810 const int cp_size = cp->length(); 1811 guarantee_property(valid_symbol_at(name_index), 1812 "Name index %u in %s has bad constant type in class file %s", 1813 name_index, tbl_name, CHECK_NULL); 1814 guarantee_property(valid_symbol_at(descriptor_index), 1815 "Signature index %u in %s has bad constant type in class file %s", 1816 descriptor_index, tbl_name, CHECK_NULL); 1817 1818 const Symbol* const name = cp->symbol_at(name_index); 1819 const Symbol* const sig = cp->symbol_at(descriptor_index); 1820 verify_legal_field_name(name, CHECK_NULL); 1821 u2 extra_slot = 0; 1822 if (!isLVTT) { 1823 verify_legal_field_signature(name, sig, CHECK_NULL); 1824 1825 // 4894874: check special cases for double and long local variables 1826 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1827 sig == vmSymbols::type_signature(T_LONG)) { 1828 extra_slot = 1; 1829 } 1830 } 1831 guarantee_property((index + extra_slot) < max_locals, 1832 "Invalid index %u in %s in class file %s", 1833 index, tbl_name, CHECK_NULL); 1834 } 1835 } 1836 return localvariable_table_start; 1837 } 1838 1839 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1840 u4 code_attribute_length, 1841 TRAPS) { 1842 assert(cfs != nullptr, "invariant"); 1843 1844 if (0 == code_attribute_length) { 1845 return nullptr; 1846 } 1847 1848 const u1* const stackmap_table_start = cfs->current(); 1849 assert(stackmap_table_start != nullptr, "null stackmap table"); 1850 1851 // check code_attribute_length 1852 cfs->skip_u1(code_attribute_length, CHECK_NULL); 1853 1854 return stackmap_table_start; 1855 } 1856 1857 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 1858 u2* const checked_exceptions_length, 1859 u4 method_attribute_length, 1860 TRAPS) { 1861 assert(cfs != nullptr, "invariant"); 1862 assert(checked_exceptions_length != nullptr, "invariant"); 1863 1864 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1865 *checked_exceptions_length = cfs->get_u2_fast(); 1866 const unsigned int size = 1867 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1868 const unsafe_u2* const checked_exceptions_start = cfs->current(); 1869 assert(checked_exceptions_start != nullptr, "null checked exceptions"); 1870 if (!_need_verify) { 1871 cfs->skip_u2_fast(size); 1872 } else { 1873 // Verify each value in the checked exception table 1874 u2 checked_exception; 1875 const u2 len = *checked_exceptions_length; 1876 cfs->guarantee_more(2 * len, CHECK_NULL); 1877 for (int i = 0; i < len; i++) { 1878 checked_exception = cfs->get_u2_fast(); 1879 guarantee_property( 1880 valid_klass_reference_at(checked_exception), 1881 "Exception name has bad type at constant pool %u in class file %s", 1882 checked_exception, CHECK_NULL); 1883 } 1884 } 1885 // check exceptions attribute length 1886 if (_need_verify) { 1887 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1888 sizeof(u2) * size), 1889 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1890 } 1891 return checked_exceptions_start; 1892 } 1893 1894 void ClassFileParser::throwIllegalSignature(const char* type, 1895 const Symbol* name, 1896 const Symbol* sig, 1897 TRAPS) const { 1898 assert(name != nullptr, "invariant"); 1899 assert(sig != nullptr, "invariant"); 1900 1901 ResourceMark rm(THREAD); 1902 // Names are all known to be < 64k so we know this formatted message is not excessively large. 1903 Exceptions::fthrow(THREAD_AND_LOCATION, 1904 vmSymbols::java_lang_ClassFormatError(), 1905 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1906 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1907 } 1908 1909 AnnotationCollector::ID 1910 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 1911 const Symbol* name, 1912 const bool can_access_vm_annotations) { 1913 const vmSymbolID sid = vmSymbols::find_sid(name); 1914 // Privileged code can use all annotations. Other code silently drops some. 1915 const bool privileged = loader_data->is_boot_class_loader_data() || 1916 loader_data->is_platform_class_loader_data() || 1917 can_access_vm_annotations; 1918 switch (sid) { 1919 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 1920 if (_location != _in_method) break; // only allow for methods 1921 if (!privileged) break; // only allow in privileged code 1922 return _method_CallerSensitive; 1923 } 1924 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 1925 if (_location != _in_method) break; // only allow for methods 1926 if (!privileged) break; // only allow in privileged code 1927 return _method_ForceInline; 1928 } 1929 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 1930 if (_location != _in_method) break; // only allow for methods 1931 if (!privileged) break; // only allow in privileged code 1932 return _method_DontInline; 1933 } 1934 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): { 1935 if (_location != _in_method) break; // only allow for methods 1936 if (!privileged) break; // only allow in privileged code 1937 return _method_ChangesCurrentThread; 1938 } 1939 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): { 1940 if (_location != _in_method) break; // only allow for methods 1941 if (!privileged) break; // only allow in privileged code 1942 return _method_JvmtiHideEvents; 1943 } 1944 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): { 1945 if (_location != _in_method) break; // only allow for methods 1946 if (!privileged) break; // only allow in privileged code 1947 return _method_JvmtiMountTransition; 1948 } 1949 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 1950 if (_location != _in_method) break; // only allow for methods 1951 if (!privileged) break; // only allow in privileged code 1952 return _method_InjectedProfile; 1953 } 1954 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 1955 if (_location != _in_method) break; // only allow for methods 1956 if (!privileged) break; // only allow in privileged code 1957 return _method_LambdaForm_Compiled; 1958 } 1959 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 1960 if (_location != _in_method) break; // only allow for methods 1961 if (!privileged) break; // only allow in privileged code 1962 return _method_Hidden; 1963 } 1964 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): { 1965 if (_location != _in_method) break; // only allow for methods 1966 if (!privileged) break; // only allow in privileged code 1967 return _method_Scoped; 1968 } 1969 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): { 1970 if (_location != _in_method) break; // only allow for methods 1971 if (!privileged) break; // only allow in privileged code 1972 return _method_IntrinsicCandidate; 1973 } 1974 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 1975 if (_location != _in_field) break; // only allow for fields 1976 if (!privileged) break; // only allow in privileged code 1977 return _field_Stable; 1978 } 1979 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_TrustFinalFields_signature): { 1980 if (_location != _in_class) break; // only allow for classes 1981 if (!privileged) break; // only allow in privileged code 1982 return _jdk_internal_vm_annotation_TrustFinalFields; 1983 } 1984 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 1985 if (_location != _in_field && _location != _in_class) { 1986 break; // only allow for fields and classes 1987 } 1988 if (!EnableContended || (RestrictContended && !privileged)) { 1989 break; // honor privileges 1990 } 1991 return _jdk_internal_vm_annotation_Contended; 1992 } 1993 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 1994 if (_location != _in_method) break; // only allow for methods 1995 if (RestrictReservedStack && !privileged) break; // honor privileges 1996 return _jdk_internal_vm_annotation_ReservedStackAccess; 1997 } 1998 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): { 1999 if (_location != _in_class) break; // only allow for classes 2000 if (!privileged) break; // only allow in privileged code 2001 return _jdk_internal_ValueBased; 2002 } 2003 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): { 2004 if (_location != _in_class) break; // only allow for classes 2005 return _jdk_internal_LooselyConsistentValue; 2006 } 2007 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): { 2008 if (_location != _in_field) break; // only allow for fields 2009 return _jdk_internal_NullRestricted; 2010 } 2011 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): { 2012 return _java_lang_Deprecated; 2013 } 2014 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): { 2015 if (_location != _in_class) break; // only allow for classes 2016 if (!privileged) break; // only allow in privileged code 2017 return _jdk_internal_vm_annotation_AOTSafeClassInitializer; 2018 } 2019 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): { 2020 if (_location != _in_method) break; // only allow for methods 2021 if (!privileged) break; // only allow in privileged code 2022 return _method_AOTRuntimeSetup; 2023 } 2024 default: { 2025 break; 2026 } 2027 } 2028 return AnnotationCollector::_unknown; 2029 } 2030 2031 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2032 if (is_contended()) 2033 // Setting the contended group also sets the contended bit in field flags 2034 f->set_contended_group(contended_group()); 2035 if (is_stable()) 2036 (f->field_flags_addr())->update_stable(true); 2037 } 2038 2039 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2040 // If there's an error deallocate metadata for field annotations 2041 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2042 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2043 } 2044 2045 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2046 if (has_annotation(_method_CallerSensitive)) 2047 m->set_caller_sensitive(); 2048 if (has_annotation(_method_ForceInline)) 2049 m->set_force_inline(); 2050 if (has_annotation(_method_DontInline)) 2051 m->set_dont_inline(); 2052 if (has_annotation(_method_ChangesCurrentThread)) 2053 m->set_changes_current_thread(); 2054 if (has_annotation(_method_JvmtiHideEvents)) 2055 m->set_jvmti_hide_events(); 2056 if (has_annotation(_method_JvmtiMountTransition)) 2057 m->set_jvmti_mount_transition(); 2058 if (has_annotation(_method_InjectedProfile)) 2059 m->set_has_injected_profile(); 2060 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2061 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2062 if (has_annotation(_method_Hidden)) 2063 m->set_is_hidden(); 2064 if (has_annotation(_method_Scoped)) 2065 m->set_scoped(); 2066 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic()) 2067 m->set_intrinsic_candidate(); 2068 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2069 m->set_has_reserved_stack_access(); 2070 if (has_annotation(_java_lang_Deprecated)) 2071 m->set_deprecated(); 2072 if (has_annotation(_java_lang_Deprecated_for_removal)) 2073 m->set_deprecated_for_removal(); 2074 } 2075 2076 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2077 assert(ik != nullptr, "invariant"); 2078 if (has_annotation(_jdk_internal_vm_annotation_Contended)) { 2079 ik->set_is_contended(is_contended()); 2080 } 2081 if (has_annotation(_jdk_internal_ValueBased)) { 2082 ik->set_has_value_based_class_annotation(); 2083 if (DiagnoseSyncOnValueBasedClasses) { 2084 ik->set_is_value_based(); 2085 } 2086 } 2087 if (has_annotation(_java_lang_Deprecated)) { 2088 Array<Method*>* methods = ik->methods(); 2089 int length = ik->methods()->length(); 2090 for (int i = 0; i < length; i++) { 2091 Method* m = methods->at(i); 2092 m->set_deprecated(); 2093 } 2094 } 2095 if (has_annotation(_java_lang_Deprecated_for_removal)) { 2096 Array<Method*>* methods = ik->methods(); 2097 int length = ik->methods()->length(); 2098 for (int i = 0; i < length; i++) { 2099 Method* m = methods->at(i); 2100 m->set_deprecated_for_removal(); 2101 } 2102 } 2103 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) { 2104 ik->set_has_aot_safe_initializer(); 2105 } 2106 if (has_annotation(_jdk_internal_vm_annotation_TrustFinalFields)) { 2107 ik->set_trust_final_fields(true); 2108 } 2109 } 2110 2111 #define MAX_ARGS_SIZE 255 2112 #define MAX_CODE_SIZE 65535 2113 #define INITIAL_MAX_LVT_NUMBER 256 2114 2115 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2116 * 2117 * Rules for LVT's and LVTT's are: 2118 * - There can be any number of LVT's and LVTT's. 2119 * - If there are n LVT's, it is the same as if there was just 2120 * one LVT containing all the entries from the n LVT's. 2121 * - There may be no more than one LVT entry per local variable. 2122 * Two LVT entries are 'equal' if these fields are the same: 2123 * start_pc, length, name, slot 2124 * - There may be no more than one LVTT entry per each LVT entry. 2125 * Each LVTT entry has to match some LVT entry. 2126 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2127 */ 2128 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2129 int lvt_cnt, 2130 u2* const localvariable_table_length, 2131 const unsafe_u2** const localvariable_table_start, 2132 int lvtt_cnt, 2133 u2* const localvariable_type_table_length, 2134 const unsafe_u2** const localvariable_type_table_start, 2135 TRAPS) { 2136 2137 ResourceMark rm(THREAD); 2138 2139 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*, 2140 256, AnyObj::RESOURCE_AREA, mtInternal, 2141 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2142 2143 LVT_HashTable* const table = new LVT_HashTable(); 2144 2145 // To fill LocalVariableTable in 2146 const Classfile_LVT_Element* cf_lvt; 2147 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2148 2149 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2150 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2151 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2152 copy_lvt_element(&cf_lvt[idx], lvt); 2153 // If no duplicates, add LVT elem in hashtable. 2154 if (table->put(*lvt, lvt) == false 2155 && _need_verify 2156 && _major_version >= JAVA_1_5_VERSION) { 2157 classfile_parse_error("Duplicated LocalVariableTable attribute " 2158 "entry for '%s' in class file %s", 2159 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2160 THREAD); 2161 return; 2162 } 2163 } 2164 } 2165 2166 // To merge LocalVariableTable and LocalVariableTypeTable 2167 const Classfile_LVT_Element* cf_lvtt; 2168 LocalVariableTableElement lvtt_elem; 2169 2170 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2171 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2172 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2173 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2174 LocalVariableTableElement** entry = table->get(lvtt_elem); 2175 if (entry == nullptr) { 2176 if (_need_verify) { 2177 classfile_parse_error("LVTT entry for '%s' in class file %s " 2178 "does not match any LVT entry", 2179 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2180 THREAD); 2181 return; 2182 } 2183 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2184 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2185 "entry for '%s' in class file %s", 2186 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2187 THREAD); 2188 return; 2189 } else { 2190 // to add generic signatures into LocalVariableTable 2191 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2192 } 2193 } 2194 } 2195 } 2196 2197 2198 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2199 const u1* runtime_visible_annotations, 2200 int runtime_visible_annotations_length, 2201 const u1* runtime_visible_parameter_annotations, 2202 int runtime_visible_parameter_annotations_length, 2203 const u1* runtime_visible_type_annotations, 2204 int runtime_visible_type_annotations_length, 2205 const u1* annotation_default, 2206 int annotation_default_length, 2207 TRAPS) { 2208 2209 AnnotationArray* a; 2210 2211 if (runtime_visible_annotations_length > 0) { 2212 a = allocate_annotations(runtime_visible_annotations, 2213 runtime_visible_annotations_length, 2214 CHECK); 2215 cm->set_method_annotations(a); 2216 } 2217 2218 if (runtime_visible_parameter_annotations_length > 0) { 2219 a = allocate_annotations(runtime_visible_parameter_annotations, 2220 runtime_visible_parameter_annotations_length, 2221 CHECK); 2222 cm->set_parameter_annotations(a); 2223 } 2224 2225 if (annotation_default_length > 0) { 2226 a = allocate_annotations(annotation_default, 2227 annotation_default_length, 2228 CHECK); 2229 cm->set_default_annotations(a); 2230 } 2231 2232 if (runtime_visible_type_annotations_length > 0) { 2233 a = allocate_annotations(runtime_visible_type_annotations, 2234 runtime_visible_type_annotations_length, 2235 CHECK); 2236 cm->set_type_annotations(a); 2237 } 2238 } 2239 2240 2241 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2242 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2243 // Method* to save footprint, so we only know the size of the resulting Method* when the 2244 // entire method attribute is parsed. 2245 // 2246 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass. 2247 2248 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2249 bool is_interface, 2250 const ConstantPool* cp, 2251 bool* const has_localvariable_table, 2252 TRAPS) { 2253 assert(cfs != nullptr, "invariant"); 2254 assert(cp != nullptr, "invariant"); 2255 assert(has_localvariable_table != nullptr, "invariant"); 2256 2257 ResourceMark rm(THREAD); 2258 // Parse fixed parts: 2259 // access_flags, name_index, descriptor_index, attributes_count 2260 cfs->guarantee_more(8, CHECK_NULL); 2261 2262 u2 flags = cfs->get_u2_fast(); 2263 const u2 name_index = cfs->get_u2_fast(); 2264 const int cp_size = cp->length(); 2265 guarantee_property( 2266 valid_symbol_at(name_index), 2267 "Illegal constant pool index %u for method name in class file %s", 2268 name_index, CHECK_NULL); 2269 const Symbol* const name = cp->symbol_at(name_index); 2270 verify_legal_method_name(name, CHECK_NULL); 2271 2272 const u2 signature_index = cfs->get_u2_fast(); 2273 guarantee_property( 2274 valid_symbol_at(signature_index), 2275 "Illegal constant pool index %u for method signature in class file %s", 2276 signature_index, CHECK_NULL); 2277 const Symbol* const signature = cp->symbol_at(signature_index); 2278 2279 if (name == vmSymbols::class_initializer_name()) { 2280 // We ignore the other access flags for a valid class initializer. 2281 // (JVM Spec 2nd ed., chapter 4.6) 2282 if (_major_version < 51) { // backward compatibility 2283 flags = JVM_ACC_STATIC; 2284 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2285 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0); 2286 } else { 2287 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD); 2288 return nullptr; 2289 } 2290 } else { 2291 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL); 2292 } 2293 2294 if (name == vmSymbols::object_initializer_name() && is_interface) { 2295 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD); 2296 return nullptr; 2297 } 2298 2299 if (Arguments::is_valhalla_enabled()) { 2300 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED) 2301 && ((flags & JVM_ACC_STATIC) == 0 ) 2302 && !_access_flags.is_identity_class()) { 2303 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD); 2304 return nullptr; 2305 } 2306 } 2307 2308 int args_size = -1; // only used when _need_verify is true 2309 if (_need_verify) { 2310 verify_legal_name_with_signature(name, signature, CHECK_NULL); 2311 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2312 verify_legal_method_signature(name, signature, CHECK_NULL); 2313 if (args_size > MAX_ARGS_SIZE) { 2314 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD); 2315 return nullptr; 2316 } 2317 } 2318 2319 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2320 2321 // Default values for code and exceptions attribute elements 2322 u2 max_stack = 0; 2323 u2 max_locals = 0; 2324 u4 code_length = 0; 2325 const u1* code_start = nullptr; 2326 u2 exception_table_length = 0; 2327 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements 2328 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2329 u2 checked_exceptions_length = 0; 2330 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements 2331 CompressedLineNumberWriteStream* linenumber_table = nullptr; 2332 int linenumber_table_length = 0; 2333 int total_lvt_length = 0; 2334 u2 lvt_cnt = 0; 2335 u2 lvtt_cnt = 0; 2336 bool lvt_allocated = false; 2337 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2338 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2339 u2* localvariable_table_length = nullptr; 2340 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes 2341 u2* localvariable_type_table_length = nullptr; 2342 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes 2343 int method_parameters_length = -1; 2344 const u1* method_parameters_data = nullptr; 2345 bool method_parameters_seen = false; 2346 bool parsed_code_attribute = false; 2347 bool parsed_checked_exceptions_attribute = false; 2348 bool parsed_stackmap_attribute = false; 2349 // stackmap attribute - JDK1.5 2350 const u1* stackmap_data = nullptr; 2351 int stackmap_data_length = 0; 2352 u2 generic_signature_index = 0; 2353 MethodAnnotationCollector parsed_annotations; 2354 const u1* runtime_visible_annotations = nullptr; 2355 int runtime_visible_annotations_length = 0; 2356 const u1* runtime_visible_parameter_annotations = nullptr; 2357 int runtime_visible_parameter_annotations_length = 0; 2358 const u1* runtime_visible_type_annotations = nullptr; 2359 int runtime_visible_type_annotations_length = 0; 2360 bool runtime_invisible_annotations_exists = false; 2361 bool runtime_invisible_type_annotations_exists = false; 2362 bool runtime_invisible_parameter_annotations_exists = false; 2363 const u1* annotation_default = nullptr; 2364 int annotation_default_length = 0; 2365 2366 // Parse code and exceptions attribute 2367 u2 method_attributes_count = cfs->get_u2_fast(); 2368 while (method_attributes_count--) { 2369 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2370 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2371 const u4 method_attribute_length = cfs->get_u4_fast(); 2372 guarantee_property( 2373 valid_symbol_at(method_attribute_name_index), 2374 "Invalid method attribute name index %u in class file %s", 2375 method_attribute_name_index, CHECK_NULL); 2376 2377 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2378 if (method_attribute_name == vmSymbols::tag_code()) { 2379 // Parse Code attribute 2380 if (_need_verify) { 2381 guarantee_property( 2382 !access_flags.is_native() && !access_flags.is_abstract(), 2383 "Code attribute in native or abstract methods in class file %s", 2384 CHECK_NULL); 2385 } 2386 if (parsed_code_attribute) { 2387 classfile_parse_error("Multiple Code attributes in class file %s", 2388 THREAD); 2389 return nullptr; 2390 } 2391 parsed_code_attribute = true; 2392 2393 // Stack size, locals size, and code size 2394 cfs->guarantee_more(8, CHECK_NULL); 2395 max_stack = cfs->get_u2_fast(); 2396 max_locals = cfs->get_u2_fast(); 2397 code_length = cfs->get_u4_fast(); 2398 if (_need_verify) { 2399 guarantee_property(args_size <= max_locals, 2400 "Arguments can't fit into locals in class file %s", 2401 CHECK_NULL); 2402 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2403 "Invalid method Code length %u in class file %s", 2404 code_length, CHECK_NULL); 2405 } 2406 // Code pointer 2407 code_start = cfs->current(); 2408 assert(code_start != nullptr, "null code start"); 2409 cfs->guarantee_more(code_length, CHECK_NULL); 2410 cfs->skip_u1_fast(code_length); 2411 2412 // Exception handler table 2413 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2414 exception_table_length = cfs->get_u2_fast(); 2415 if (exception_table_length > 0) { 2416 exception_table_start = parse_exception_table(cfs, 2417 code_length, 2418 exception_table_length, 2419 CHECK_NULL); 2420 } 2421 2422 // Parse additional attributes in code attribute 2423 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2424 u2 code_attributes_count = cfs->get_u2_fast(); 2425 2426 unsigned int calculated_attribute_length = 0; 2427 2428 calculated_attribute_length = 2429 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2430 calculated_attribute_length += checked_cast<unsigned int>( 2431 code_length + 2432 sizeof(exception_table_length) + 2433 sizeof(code_attributes_count) + 2434 exception_table_length * 2435 ( sizeof(u2) + // start_pc 2436 sizeof(u2) + // end_pc 2437 sizeof(u2) + // handler_pc 2438 sizeof(u2) )); // catch_type_index 2439 2440 while (code_attributes_count--) { 2441 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2442 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2443 const u4 code_attribute_length = cfs->get_u4_fast(); 2444 calculated_attribute_length += code_attribute_length + 2445 (unsigned)sizeof(code_attribute_name_index) + 2446 (unsigned)sizeof(code_attribute_length); 2447 guarantee_property(valid_symbol_at(code_attribute_name_index), 2448 "Invalid code attribute name index %u in class file %s", 2449 code_attribute_name_index, 2450 CHECK_NULL); 2451 if (LoadLineNumberTables && 2452 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2453 // Parse and compress line number table 2454 parse_linenumber_table(code_attribute_length, 2455 code_length, 2456 &linenumber_table, 2457 CHECK_NULL); 2458 2459 } else if (LoadLocalVariableTables && 2460 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2461 // Parse local variable table 2462 if (!lvt_allocated) { 2463 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2464 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2465 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2466 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2467 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2468 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2469 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2470 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2471 lvt_allocated = true; 2472 } 2473 if (lvt_cnt == max_lvt_cnt) { 2474 max_lvt_cnt <<= 1; 2475 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2476 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2477 } 2478 localvariable_table_start[lvt_cnt] = 2479 parse_localvariable_table(cfs, 2480 code_length, 2481 max_locals, 2482 code_attribute_length, 2483 &localvariable_table_length[lvt_cnt], 2484 false, // is not LVTT 2485 CHECK_NULL); 2486 total_lvt_length += localvariable_table_length[lvt_cnt]; 2487 lvt_cnt++; 2488 } else if (LoadLocalVariableTypeTables && 2489 _major_version >= JAVA_1_5_VERSION && 2490 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2491 if (!lvt_allocated) { 2492 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2493 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2494 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2495 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2496 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2497 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2498 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2499 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2500 lvt_allocated = true; 2501 } 2502 // Parse local variable type table 2503 if (lvtt_cnt == max_lvtt_cnt) { 2504 max_lvtt_cnt <<= 1; 2505 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2506 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2507 } 2508 localvariable_type_table_start[lvtt_cnt] = 2509 parse_localvariable_table(cfs, 2510 code_length, 2511 max_locals, 2512 code_attribute_length, 2513 &localvariable_type_table_length[lvtt_cnt], 2514 true, // is LVTT 2515 CHECK_NULL); 2516 lvtt_cnt++; 2517 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2518 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2519 // Stack map is only needed by the new verifier in JDK1.5. 2520 if (parsed_stackmap_attribute) { 2521 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD); 2522 return nullptr; 2523 } 2524 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL); 2525 stackmap_data_length = code_attribute_length; 2526 parsed_stackmap_attribute = true; 2527 } else { 2528 // Skip unknown attributes 2529 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2530 } 2531 } 2532 // check method attribute length 2533 if (_need_verify) { 2534 guarantee_property(method_attribute_length == calculated_attribute_length, 2535 "Code segment has wrong length in class file %s", 2536 CHECK_NULL); 2537 } 2538 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2539 // Parse Exceptions attribute 2540 if (parsed_checked_exceptions_attribute) { 2541 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2542 THREAD); 2543 return nullptr; 2544 } 2545 parsed_checked_exceptions_attribute = true; 2546 checked_exceptions_start = 2547 parse_checked_exceptions(cfs, 2548 &checked_exceptions_length, 2549 method_attribute_length, 2550 CHECK_NULL); 2551 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2552 // reject multiple method parameters 2553 if (method_parameters_seen) { 2554 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2555 THREAD); 2556 return nullptr; 2557 } 2558 method_parameters_seen = true; 2559 method_parameters_length = cfs->get_u1_fast(); 2560 const u4 real_length = (method_parameters_length * 4u) + 1u; 2561 if (method_attribute_length != real_length) { 2562 classfile_parse_error( 2563 "Invalid MethodParameters method attribute length %u in class file", 2564 method_attribute_length, THREAD); 2565 return nullptr; 2566 } 2567 method_parameters_data = cfs->current(); 2568 cfs->skip_u2_fast(method_parameters_length); 2569 cfs->skip_u2_fast(method_parameters_length); 2570 // ignore this attribute if it cannot be reflected 2571 if (!vmClasses::reflect_Parameter_klass_is_loaded()) 2572 method_parameters_length = -1; 2573 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2574 if (method_attribute_length != 0) { 2575 classfile_parse_error( 2576 "Invalid Synthetic method attribute length %u in class file %s", 2577 method_attribute_length, THREAD); 2578 return nullptr; 2579 } 2580 // Should we check that there hasn't already been a synthetic attribute? 2581 access_flags.set_is_synthetic(); 2582 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2583 if (method_attribute_length != 0) { 2584 classfile_parse_error( 2585 "Invalid Deprecated method attribute length %u in class file %s", 2586 method_attribute_length, THREAD); 2587 return nullptr; 2588 } 2589 } else if (_major_version >= JAVA_1_5_VERSION) { 2590 if (method_attribute_name == vmSymbols::tag_signature()) { 2591 if (generic_signature_index != 0) { 2592 classfile_parse_error( 2593 "Multiple Signature attributes for method in class file %s", 2594 THREAD); 2595 return nullptr; 2596 } 2597 if (method_attribute_length != 2) { 2598 classfile_parse_error( 2599 "Invalid Signature attribute length %u in class file %s", 2600 method_attribute_length, THREAD); 2601 return nullptr; 2602 } 2603 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2604 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2605 if (runtime_visible_annotations != nullptr) { 2606 classfile_parse_error( 2607 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2608 THREAD); 2609 return nullptr; 2610 } 2611 runtime_visible_annotations_length = method_attribute_length; 2612 runtime_visible_annotations = cfs->current(); 2613 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 2614 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2615 parse_annotations(cp, 2616 runtime_visible_annotations, 2617 runtime_visible_annotations_length, 2618 &parsed_annotations, 2619 _loader_data, 2620 _can_access_vm_annotations); 2621 cfs->skip_u1_fast(runtime_visible_annotations_length); 2622 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2623 if (runtime_invisible_annotations_exists) { 2624 classfile_parse_error( 2625 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2626 THREAD); 2627 return nullptr; 2628 } 2629 runtime_invisible_annotations_exists = true; 2630 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2631 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2632 if (runtime_visible_parameter_annotations != nullptr) { 2633 classfile_parse_error( 2634 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2635 THREAD); 2636 return nullptr; 2637 } 2638 runtime_visible_parameter_annotations_length = method_attribute_length; 2639 runtime_visible_parameter_annotations = cfs->current(); 2640 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations"); 2641 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2642 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2643 if (runtime_invisible_parameter_annotations_exists) { 2644 classfile_parse_error( 2645 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2646 THREAD); 2647 return nullptr; 2648 } 2649 runtime_invisible_parameter_annotations_exists = true; 2650 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2651 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2652 if (annotation_default != nullptr) { 2653 classfile_parse_error( 2654 "Multiple AnnotationDefault attributes for method in class file %s", 2655 THREAD); 2656 return nullptr; 2657 } 2658 annotation_default_length = method_attribute_length; 2659 annotation_default = cfs->current(); 2660 assert(annotation_default != nullptr, "null annotation default"); 2661 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2662 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2663 if (runtime_visible_type_annotations != nullptr) { 2664 classfile_parse_error( 2665 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2666 THREAD); 2667 return nullptr; 2668 } 2669 runtime_visible_type_annotations_length = method_attribute_length; 2670 runtime_visible_type_annotations = cfs->current(); 2671 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 2672 // No need for the VM to parse Type annotations 2673 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2674 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2675 if (runtime_invisible_type_annotations_exists) { 2676 classfile_parse_error( 2677 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2678 THREAD); 2679 return nullptr; 2680 } 2681 runtime_invisible_type_annotations_exists = true; 2682 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2683 } else { 2684 // Skip unknown attributes 2685 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2686 } 2687 } else { 2688 // Skip unknown attributes 2689 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2690 } 2691 } 2692 2693 if (linenumber_table != nullptr) { 2694 linenumber_table->write_terminator(); 2695 linenumber_table_length = linenumber_table->position(); 2696 } 2697 2698 // Make sure there's at least one Code attribute in non-native/non-abstract method 2699 if (_need_verify) { 2700 guarantee_property(access_flags.is_native() || 2701 access_flags.is_abstract() || 2702 parsed_code_attribute, 2703 "Absent Code attribute in method that is not native or abstract in class file %s", 2704 CHECK_NULL); 2705 } 2706 2707 // All sizing information for a Method* is finally available, now create it 2708 InlineTableSizes sizes( 2709 total_lvt_length, 2710 linenumber_table_length, 2711 exception_table_length, 2712 checked_exceptions_length, 2713 method_parameters_length, 2714 generic_signature_index, 2715 runtime_visible_annotations_length, 2716 runtime_visible_parameter_annotations_length, 2717 runtime_visible_type_annotations_length, 2718 annotation_default_length, 2719 0); 2720 2721 Method* const m = Method::allocate(_loader_data, 2722 code_length, 2723 access_flags, 2724 &sizes, 2725 ConstMethod::NORMAL, 2726 _cp->symbol_at(name_index), 2727 CHECK_NULL); 2728 2729 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2730 2731 // Fill in information from fixed part (access_flags already set) 2732 m->set_constants(_cp); 2733 m->set_name_index(name_index); 2734 m->set_signature_index(signature_index); 2735 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static()); 2736 assert(args_size < 0 || args_size == m->size_of_parameters(), ""); 2737 2738 // Fill in code attribute information 2739 m->set_max_stack(max_stack); 2740 m->set_max_locals(max_locals); 2741 if (stackmap_data != nullptr) { 2742 m->constMethod()->copy_stackmap_data(_loader_data, 2743 (u1*)stackmap_data, 2744 stackmap_data_length, 2745 CHECK_NULL); 2746 } 2747 2748 // Copy byte codes 2749 m->set_code((u1*)code_start); 2750 2751 // Copy line number table 2752 if (linenumber_table != nullptr) { 2753 memcpy(m->compressed_linenumber_table(), 2754 linenumber_table->buffer(), 2755 linenumber_table_length); 2756 } 2757 2758 // Copy exception table 2759 if (exception_table_length > 0) { 2760 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2761 m->exception_table_start(), 2762 exception_table_length * sizeof(ExceptionTableElement), 2763 sizeof(u2)); 2764 } 2765 2766 // Copy method parameters 2767 if (method_parameters_length > 0) { 2768 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2769 for (int i = 0; i < method_parameters_length; i++) { 2770 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2771 method_parameters_data += 2; 2772 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2773 method_parameters_data += 2; 2774 } 2775 } 2776 2777 // Copy checked exceptions 2778 if (checked_exceptions_length > 0) { 2779 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2780 m->checked_exceptions_start(), 2781 checked_exceptions_length * sizeof(CheckedExceptionElement), 2782 sizeof(u2)); 2783 } 2784 2785 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2786 if (total_lvt_length > 0) { 2787 *has_localvariable_table = true; 2788 copy_localvariable_table(m->constMethod(), 2789 lvt_cnt, 2790 localvariable_table_length, 2791 localvariable_table_start, 2792 lvtt_cnt, 2793 localvariable_type_table_length, 2794 localvariable_type_table_start, 2795 CHECK_NULL); 2796 } 2797 2798 if (parsed_annotations.has_any_annotations()) 2799 parsed_annotations.apply_to(methodHandle(THREAD, m)); 2800 2801 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'. 2802 m->set_is_hidden(); 2803 } 2804 if (parsed_annotations.has_aot_runtime_setup()) { 2805 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() || 2806 !access_flags.is_private() || !access_flags.is_static()) { 2807 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL); 2808 } 2809 _has_aot_runtime_setup_method = true; 2810 } 2811 2812 // Copy annotations 2813 copy_method_annotations(m->constMethod(), 2814 runtime_visible_annotations, 2815 runtime_visible_annotations_length, 2816 runtime_visible_parameter_annotations, 2817 runtime_visible_parameter_annotations_length, 2818 runtime_visible_type_annotations, 2819 runtime_visible_type_annotations_length, 2820 annotation_default, 2821 annotation_default_length, 2822 CHECK_NULL); 2823 2824 if (InstanceKlass::is_finalization_enabled() && 2825 name == vmSymbols::finalize_method_name() && 2826 signature == vmSymbols::void_method_signature()) { 2827 if (m->is_empty_method()) { 2828 _has_empty_finalizer = true; 2829 } else { 2830 _has_finalizer = true; 2831 } 2832 } 2833 2834 NOT_PRODUCT(m->verify()); 2835 return m; 2836 } 2837 2838 2839 // Side-effects: populates the _methods field in the parser 2840 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2841 bool is_interface, 2842 bool* const has_localvariable_table, 2843 bool* has_final_method, 2844 bool* declares_nonstatic_concrete_methods, 2845 TRAPS) { 2846 assert(cfs != nullptr, "invariant"); 2847 assert(has_localvariable_table != nullptr, "invariant"); 2848 assert(has_final_method != nullptr, "invariant"); 2849 assert(declares_nonstatic_concrete_methods != nullptr, "invariant"); 2850 2851 assert(nullptr == _methods, "invariant"); 2852 2853 cfs->guarantee_more(2, CHECK); // length 2854 const u2 length = cfs->get_u2_fast(); 2855 if (length == 0) { 2856 _methods = Universe::the_empty_method_array(); 2857 } else { 2858 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2859 length, 2860 nullptr, 2861 CHECK); 2862 2863 for (int index = 0; index < length; index++) { 2864 Method* method = parse_method(cfs, 2865 is_interface, 2866 _cp, 2867 has_localvariable_table, 2868 CHECK); 2869 2870 if (method->is_final()) { 2871 *has_final_method = true; 2872 } 2873 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2874 // used for interface initialization, and default method inheritance analysis 2875 if (is_interface && !(*declares_nonstatic_concrete_methods) 2876 && !method->is_abstract() && !method->is_static()) { 2877 *declares_nonstatic_concrete_methods = true; 2878 } 2879 _methods->at_put(index, method); 2880 } 2881 2882 if (_need_verify && length > 1) { 2883 // Check duplicated methods 2884 ResourceMark rm(THREAD); 2885 // Set containing name-signature pairs 2886 NameSigHashtable* names_and_sigs = new NameSigHashtable(); 2887 for (int i = 0; i < length; i++) { 2888 const Method* const m = _methods->at(i); 2889 NameSigHash name_and_sig(m->name(), m->signature()); 2890 // If no duplicates, add name/signature in hashtable names_and_sigs. 2891 if(!names_and_sigs->put(name_and_sig, 0)) { 2892 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2893 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); 2894 return; 2895 } 2896 } 2897 } 2898 } 2899 } 2900 2901 static const intArray* sort_methods(Array<Method*>* methods) { 2902 const int length = methods->length(); 2903 // If JVMTI original method ordering or sharing is enabled we have to 2904 // remember the original class file ordering. 2905 // We temporarily use the vtable_index field in the Method* to store the 2906 // class file index, so we can read in after calling qsort. 2907 // Put the method ordering in the shared archive. 2908 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { 2909 for (int index = 0; index < length; index++) { 2910 Method* const m = methods->at(index); 2911 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2912 m->set_vtable_index(index); 2913 } 2914 } 2915 // Sort method array by ascending method name (for faster lookups & vtable construction) 2916 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2917 Method::sort_methods(methods); 2918 2919 intArray* method_ordering = nullptr; 2920 // If JVMTI original method ordering or sharing is enabled construct int 2921 // array remembering the original ordering 2922 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { 2923 method_ordering = new intArray(length, length, -1); 2924 for (int index = 0; index < length; index++) { 2925 Method* const m = methods->at(index); 2926 const int old_index = m->vtable_index(); 2927 assert(old_index >= 0 && old_index < length, "invalid method index"); 2928 method_ordering->at_put(index, old_index); 2929 m->set_vtable_index(Method::invalid_vtable_index); 2930 } 2931 } 2932 return method_ordering; 2933 } 2934 2935 // Parse generic_signature attribute for methods and fields 2936 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 2937 TRAPS) { 2938 assert(cfs != nullptr, "invariant"); 2939 2940 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2941 const u2 generic_signature_index = cfs->get_u2_fast(); 2942 guarantee_property( 2943 valid_symbol_at(generic_signature_index), 2944 "Invalid Signature attribute at constant pool index %u in class file %s", 2945 generic_signature_index, CHECK_0); 2946 return generic_signature_index; 2947 } 2948 2949 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 2950 TRAPS) { 2951 2952 assert(cfs != nullptr, "invariant"); 2953 2954 cfs->guarantee_more(2, CHECK); // sourcefile_index 2955 const u2 sourcefile_index = cfs->get_u2_fast(); 2956 guarantee_property( 2957 valid_symbol_at(sourcefile_index), 2958 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2959 sourcefile_index, CHECK); 2960 set_class_sourcefile_index(sourcefile_index); 2961 } 2962 2963 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 2964 int length, 2965 TRAPS) { 2966 assert(cfs != nullptr, "invariant"); 2967 2968 const u1* const sde_buffer = cfs->current(); 2969 assert(sde_buffer != nullptr, "null sde buffer"); 2970 2971 // Don't bother storing it if there is no way to retrieve it 2972 if (JvmtiExport::can_get_source_debug_extension()) { 2973 assert((length+1) > length, "Overflow checking"); 2974 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2975 for (int i = 0; i < length; i++) { 2976 sde[i] = sde_buffer[i]; 2977 } 2978 sde[length] = '\0'; 2979 set_class_sde_buffer((const char*)sde, length); 2980 } 2981 // Got utf8 string, set stream position forward 2982 cfs->skip_u1(length, CHECK); 2983 } 2984 2985 2986 // Inner classes can be static, private or protected (classic VM does this) 2987 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 2988 JVM_ACC_PRIVATE | \ 2989 JVM_ACC_PROTECTED | \ 2990 JVM_ACC_STATIC \ 2991 ) 2992 2993 // Find index of the InnerClasses entry for the specified inner_class_info_index. 2994 // Return -1 if none is found. 2995 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 2996 Symbol* cp_klass_name = cp->klass_name_at(inner); 2997 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 2998 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 2999 if (cp->klass_name_at(idx_inner) == cp_klass_name) { 3000 return idx; 3001 } 3002 } 3003 return -1; 3004 } 3005 3006 // Return the outer_class_info_index for the InnerClasses entry containing the 3007 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found. 3008 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 3009 if (inner == 0) return -1; 3010 int idx = inner_classes_find_index(inner_classes, inner, cp, length); 3011 if (idx == -1) return -1; 3012 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3013 return result; 3014 } 3015 3016 // Return true if circularity is found, false if no circularity is found. 3017 // Use Floyd's cycle finding algorithm. 3018 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) { 3019 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 3020 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3021 3022 while (fast != -1 && fast != 0) { 3023 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) { 3024 return true; // found a circularity 3025 } 3026 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3027 if (fast == -1) return false; 3028 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3029 if (fast == -1) return false; 3030 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length); 3031 assert(slow != -1, "sanity check"); 3032 } 3033 return false; 3034 } 3035 3036 // Loop through each InnerClasses entry checking for circularities and duplications 3037 // with other entries. If duplicate entries are found then throw CFE. Otherwise, 3038 // return true if a circularity or entries with duplicate inner_class_info_indexes 3039 // are found. 3040 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) { 3041 // Loop through each InnerClasses entry. 3042 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 3043 // Return true if there are circular entries. 3044 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) { 3045 return true; 3046 } 3047 // Check if there are duplicate entries or entries with the same inner_class_info_index. 3048 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length; 3049 y += InstanceKlass::inner_class_next_offset) { 3050 3051 // 4347400: make sure there's no duplicate entry in the classes array 3052 if (_major_version >= JAVA_1_5_VERSION) { 3053 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) || 3054 _inner_classes->at(idx+1) != _inner_classes->at(y+1) || 3055 _inner_classes->at(idx+2) != _inner_classes->at(y+2) || 3056 _inner_classes->at(idx+3) != _inner_classes->at(y+3)), 3057 "Duplicate entry in InnerClasses attribute in class file %s", 3058 CHECK_(true)); 3059 } 3060 // Return true if there are two entries with the same inner_class_info_index. 3061 if (_inner_classes->at(y) == _inner_classes->at(idx)) { 3062 return true; 3063 } 3064 } 3065 } 3066 return false; 3067 } 3068 3069 // Return number of classes in the inner classes attribute table 3070 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3071 const ConstantPool* cp, 3072 const u1* const inner_classes_attribute_start, 3073 bool parsed_enclosingmethod_attribute, 3074 u2 enclosing_method_class_index, 3075 u2 enclosing_method_method_index, 3076 TRAPS) { 3077 const u1* const current_mark = cfs->current(); 3078 u2 length = 0; 3079 if (inner_classes_attribute_start != nullptr) { 3080 cfs->set_current(inner_classes_attribute_start); 3081 cfs->guarantee_more(2, CHECK_0); // length 3082 length = cfs->get_u2_fast(); 3083 } 3084 3085 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3086 // method data: 3087 // [inner_class_info_index, 3088 // outer_class_info_index, 3089 // inner_name_index, 3090 // inner_class_access_flags, 3091 // ... 3092 // enclosing_method_class_index, 3093 // enclosing_method_method_index] 3094 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3095 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3096 _inner_classes = inner_classes; 3097 3098 int index = 0; 3099 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3100 for (int n = 0; n < length; n++) { 3101 // Inner class index 3102 const u2 inner_class_info_index = cfs->get_u2_fast(); 3103 guarantee_property( 3104 valid_klass_reference_at(inner_class_info_index), 3105 "inner_class_info_index %u has bad constant type in class file %s", 3106 inner_class_info_index, CHECK_0); 3107 // Outer class index 3108 const u2 outer_class_info_index = cfs->get_u2_fast(); 3109 guarantee_property( 3110 outer_class_info_index == 0 || 3111 valid_klass_reference_at(outer_class_info_index), 3112 "outer_class_info_index %u has bad constant type in class file %s", 3113 outer_class_info_index, CHECK_0); 3114 3115 if (outer_class_info_index != 0) { 3116 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index); 3117 char* bytes = (char*)outer_class_name->bytes(); 3118 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY, 3119 "Outer class is an array class in class file %s", CHECK_0); 3120 } 3121 // Inner class name 3122 const u2 inner_name_index = cfs->get_u2_fast(); 3123 guarantee_property( 3124 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3125 "inner_name_index %u has bad constant type in class file %s", 3126 inner_name_index, CHECK_0); 3127 if (_need_verify) { 3128 guarantee_property(inner_class_info_index != outer_class_info_index, 3129 "Class is both outer and inner class in class file %s", CHECK_0); 3130 } 3131 3132 // Access flags 3133 u2 flags; 3134 // JVM_ACC_MODULE is defined in JDK-9 and later. 3135 if (_major_version >= JAVA_9_VERSION) { 3136 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3137 } else { 3138 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3139 } 3140 3141 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3142 // Set abstract bit for old class files for backward compatibility 3143 flags |= JVM_ACC_ABSTRACT; 3144 } 3145 3146 if (!supports_inline_types()) { 3147 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 3148 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3149 if (!is_module && !is_interface) { 3150 flags |= JVM_ACC_IDENTITY; 3151 } 3152 } 3153 3154 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index); 3155 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0); 3156 AccessFlags inner_access_flags(flags); 3157 3158 inner_classes->at_put(index++, inner_class_info_index); 3159 inner_classes->at_put(index++, outer_class_info_index); 3160 inner_classes->at_put(index++, inner_name_index); 3161 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short()); 3162 } 3163 3164 // Check for circular and duplicate entries. 3165 bool has_circularity = false; 3166 if (_need_verify) { 3167 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0); 3168 if (has_circularity) { 3169 // If circularity check failed then ignore InnerClasses attribute. 3170 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 3171 index = 0; 3172 if (parsed_enclosingmethod_attribute) { 3173 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0); 3174 _inner_classes = inner_classes; 3175 } else { 3176 _inner_classes = Universe::the_empty_short_array(); 3177 } 3178 } 3179 } 3180 // Set EnclosingMethod class and method indexes. 3181 if (parsed_enclosingmethod_attribute) { 3182 inner_classes->at_put(index++, enclosing_method_class_index); 3183 inner_classes->at_put(index++, enclosing_method_method_index); 3184 } 3185 assert(index == size || has_circularity, "wrong size"); 3186 3187 // Restore buffer's current position. 3188 cfs->set_current(current_mark); 3189 3190 return length; 3191 } 3192 3193 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3194 const u1* const nest_members_attribute_start, 3195 TRAPS) { 3196 const u1* const current_mark = cfs->current(); 3197 u2 length = 0; 3198 if (nest_members_attribute_start != nullptr) { 3199 cfs->set_current(nest_members_attribute_start); 3200 cfs->guarantee_more(2, CHECK_0); // length 3201 length = cfs->get_u2_fast(); 3202 } 3203 const int size = length; 3204 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3205 _nest_members = nest_members; 3206 3207 int index = 0; 3208 cfs->guarantee_more(2 * length, CHECK_0); 3209 for (int n = 0; n < length; n++) { 3210 const u2 class_info_index = cfs->get_u2_fast(); 3211 guarantee_property( 3212 valid_klass_reference_at(class_info_index), 3213 "Nest member class_info_index %u has bad constant type in class file %s", 3214 class_info_index, CHECK_0); 3215 nest_members->at_put(index++, class_info_index); 3216 } 3217 assert(index == size, "wrong size"); 3218 3219 // Restore buffer's current position. 3220 cfs->set_current(current_mark); 3221 3222 return length; 3223 } 3224 3225 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs, 3226 const u1* const permitted_subclasses_attribute_start, 3227 TRAPS) { 3228 const u1* const current_mark = cfs->current(); 3229 u2 length = 0; 3230 if (permitted_subclasses_attribute_start != nullptr) { 3231 cfs->set_current(permitted_subclasses_attribute_start); 3232 cfs->guarantee_more(2, CHECK_0); // length 3233 length = cfs->get_u2_fast(); 3234 } 3235 const int size = length; 3236 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3237 _permitted_subclasses = permitted_subclasses; 3238 3239 if (length > 0) { 3240 int index = 0; 3241 cfs->guarantee_more(2 * length, CHECK_0); 3242 for (int n = 0; n < length; n++) { 3243 const u2 class_info_index = cfs->get_u2_fast(); 3244 guarantee_property( 3245 valid_klass_reference_at(class_info_index), 3246 "Permitted subclass class_info_index %u has bad constant type in class file %s", 3247 class_info_index, CHECK_0); 3248 permitted_subclasses->at_put(index++, class_info_index); 3249 } 3250 assert(index == size, "wrong size"); 3251 } 3252 3253 // Restore buffer's current position. 3254 cfs->set_current(current_mark); 3255 3256 return length; 3257 } 3258 3259 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs, 3260 const u1* const loadable_descriptors_attribute_start, 3261 TRAPS) { 3262 const u1* const current_mark = cfs->current(); 3263 u2 length = 0; 3264 if (loadable_descriptors_attribute_start != nullptr) { 3265 cfs->set_current(loadable_descriptors_attribute_start); 3266 cfs->guarantee_more(2, CHECK_0); // length 3267 length = cfs->get_u2_fast(); 3268 } 3269 const int size = length; 3270 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3271 _loadable_descriptors = loadable_descriptors; 3272 if (length > 0) { 3273 int index = 0; 3274 cfs->guarantee_more(2 * length, CHECK_0); 3275 for (int n = 0; n < length; n++) { 3276 const u2 descriptor_index = cfs->get_u2_fast(); 3277 guarantee_property( 3278 valid_symbol_at(descriptor_index), 3279 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s", 3280 descriptor_index, CHECK_0); 3281 Symbol* descriptor = _cp->symbol_at(descriptor_index); 3282 bool valid = legal_field_signature(descriptor, CHECK_0); 3283 if(!valid) { 3284 ResourceMark rm(THREAD); 3285 Exceptions::fthrow(THREAD_AND_LOCATION, 3286 vmSymbols::java_lang_ClassFormatError(), 3287 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"", 3288 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string()); 3289 return 0; 3290 } 3291 loadable_descriptors->at_put(index++, descriptor_index); 3292 } 3293 assert(index == size, "wrong size"); 3294 } 3295 3296 // Restore buffer's current position. 3297 cfs->set_current(current_mark); 3298 3299 return length; 3300 } 3301 3302 // Record { 3303 // u2 attribute_name_index; 3304 // u4 attribute_length; 3305 // u2 components_count; 3306 // component_info components[components_count]; 3307 // } 3308 // component_info { 3309 // u2 name_index; 3310 // u2 descriptor_index 3311 // u2 attributes_count; 3312 // attribute_info_attributes[attributes_count]; 3313 // } 3314 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, 3315 const ConstantPool* cp, 3316 const u1* const record_attribute_start, 3317 TRAPS) { 3318 const u1* const current_mark = cfs->current(); 3319 int components_count = 0; 3320 unsigned int calculate_attr_size = 0; 3321 if (record_attribute_start != nullptr) { 3322 cfs->set_current(record_attribute_start); 3323 cfs->guarantee_more(2, CHECK_0); // num of components 3324 components_count = (int)cfs->get_u2_fast(); 3325 calculate_attr_size = 2; 3326 } 3327 3328 Array<RecordComponent*>* const record_components = 3329 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0); 3330 _record_components = record_components; 3331 3332 for (int x = 0; x < components_count; x++) { 3333 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count 3334 3335 const u2 name_index = cfs->get_u2_fast(); 3336 guarantee_property(valid_symbol_at(name_index), 3337 "Invalid constant pool index %u for name in Record attribute in class file %s", 3338 name_index, CHECK_0); 3339 const Symbol* const name = cp->symbol_at(name_index); 3340 verify_legal_field_name(name, CHECK_0); 3341 3342 const u2 descriptor_index = cfs->get_u2_fast(); 3343 guarantee_property(valid_symbol_at(descriptor_index), 3344 "Invalid constant pool index %u for descriptor in Record attribute in class file %s", 3345 descriptor_index, CHECK_0); 3346 const Symbol* const descr = cp->symbol_at(descriptor_index); 3347 verify_legal_field_signature(name, descr, CHECK_0); 3348 3349 const u2 attributes_count = cfs->get_u2_fast(); 3350 calculate_attr_size += 6; 3351 u2 generic_sig_index = 0; 3352 const u1* runtime_visible_annotations = nullptr; 3353 int runtime_visible_annotations_length = 0; 3354 bool runtime_invisible_annotations_exists = false; 3355 const u1* runtime_visible_type_annotations = nullptr; 3356 int runtime_visible_type_annotations_length = 0; 3357 bool runtime_invisible_type_annotations_exists = false; 3358 3359 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, 3360 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. 3361 for (int y = 0; y < attributes_count; y++) { 3362 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length 3363 const u2 attribute_name_index = cfs->get_u2_fast(); 3364 const u4 attribute_length = cfs->get_u4_fast(); 3365 calculate_attr_size += 6; 3366 guarantee_property( 3367 valid_symbol_at(attribute_name_index), 3368 "Invalid Record attribute name index %u in class file %s", 3369 attribute_name_index, CHECK_0); 3370 3371 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 3372 if (attribute_name == vmSymbols::tag_signature()) { 3373 if (generic_sig_index != 0) { 3374 classfile_parse_error( 3375 "Multiple Signature attributes for Record component in class file %s", 3376 THREAD); 3377 return 0; 3378 } 3379 if (attribute_length != 2) { 3380 classfile_parse_error( 3381 "Invalid Signature attribute length %u in Record component in class file %s", 3382 attribute_length, THREAD); 3383 return 0; 3384 } 3385 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); 3386 3387 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 3388 if (runtime_visible_annotations != nullptr) { 3389 classfile_parse_error( 3390 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD); 3391 return 0; 3392 } 3393 runtime_visible_annotations_length = attribute_length; 3394 runtime_visible_annotations = cfs->current(); 3395 3396 assert(runtime_visible_annotations != nullptr, "null record component visible annotation"); 3397 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); 3398 cfs->skip_u1_fast(runtime_visible_annotations_length); 3399 3400 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 3401 if (runtime_invisible_annotations_exists) { 3402 classfile_parse_error( 3403 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD); 3404 return 0; 3405 } 3406 runtime_invisible_annotations_exists = true; 3407 cfs->skip_u1(attribute_length, CHECK_0); 3408 3409 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 3410 if (runtime_visible_type_annotations != nullptr) { 3411 classfile_parse_error( 3412 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3413 return 0; 3414 } 3415 runtime_visible_type_annotations_length = attribute_length; 3416 runtime_visible_type_annotations = cfs->current(); 3417 3418 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation"); 3419 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); 3420 cfs->skip_u1_fast(runtime_visible_type_annotations_length); 3421 3422 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 3423 if (runtime_invisible_type_annotations_exists) { 3424 classfile_parse_error( 3425 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3426 return 0; 3427 } 3428 runtime_invisible_type_annotations_exists = true; 3429 cfs->skip_u1(attribute_length, CHECK_0); 3430 3431 } else { 3432 // Skip unknown attributes 3433 cfs->skip_u1(attribute_length, CHECK_0); 3434 } 3435 calculate_attr_size += attribute_length; 3436 } // End of attributes For loop 3437 3438 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations, 3439 runtime_visible_annotations_length, 3440 CHECK_0); 3441 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations, 3442 runtime_visible_type_annotations_length, 3443 CHECK_0); 3444 3445 RecordComponent* record_component = 3446 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index, 3447 annotations, type_annotations, CHECK_0); 3448 record_components->at_put(x, record_component); 3449 } // End of component processing loop 3450 3451 // Restore buffer's current position. 3452 cfs->set_current(current_mark); 3453 return calculate_attr_size; 3454 } 3455 3456 void ClassFileParser::parse_classfile_synthetic_attribute() { 3457 set_class_synthetic_flag(true); 3458 } 3459 3460 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3461 assert(cfs != nullptr, "invariant"); 3462 3463 const u2 signature_index = cfs->get_u2(CHECK); 3464 guarantee_property( 3465 valid_symbol_at(signature_index), 3466 "Invalid constant pool index %u in Signature attribute in class file %s", 3467 signature_index, CHECK); 3468 set_class_generic_signature_index(signature_index); 3469 } 3470 3471 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3472 ConstantPool* cp, 3473 u4 attribute_byte_length, 3474 TRAPS) { 3475 assert(cfs != nullptr, "invariant"); 3476 assert(cp != nullptr, "invariant"); 3477 const int cp_size = cp->length(); 3478 3479 const u1* const current_before_parsing = cfs->current(); 3480 3481 guarantee_property(attribute_byte_length >= sizeof(u2), 3482 "Invalid BootstrapMethods attribute length %u in class file %s", 3483 attribute_byte_length, 3484 CHECK); 3485 3486 cfs->guarantee_more(attribute_byte_length, CHECK); 3487 3488 const int num_bootstrap_methods = cfs->get_u2_fast(); 3489 3490 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods, 3491 "Short length on BootstrapMethods in class file %s", 3492 CHECK); 3493 3494 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3495 3496 // Eagerly assign the arrays so that they will be deallocated with the constant 3497 // pool if there is an error. 3498 BSMAttributeEntries::InsertionIterator iter = 3499 cp->bsm_entries().start_extension(num_bootstrap_methods, 3500 bootstrap_methods_u2_len, 3501 _loader_data, 3502 CHECK); 3503 3504 for (int i = 0; i < num_bootstrap_methods; i++) { 3505 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3506 u2 bootstrap_method_ref = cfs->get_u2_fast(); 3507 u2 num_bootstrap_arguments = cfs->get_u2_fast(); 3508 guarantee_property( 3509 valid_cp_range(bootstrap_method_ref, cp_size) && 3510 cp->tag_at(bootstrap_method_ref).is_method_handle(), 3511 "bootstrap_method_index %u has bad constant type in class file %s", 3512 bootstrap_method_ref, 3513 CHECK); 3514 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc] 3515 3516 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments); 3517 guarantee_property(entry != nullptr, 3518 "Invalid BootstrapMethods num_bootstrap_methods." 3519 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK); 3520 3521 for (int argi = 0; argi < num_bootstrap_arguments; argi++) { 3522 const u2 argument_index = cfs->get_u2_fast(); 3523 guarantee_property( 3524 valid_cp_range(argument_index, cp_size) && 3525 cp->tag_at(argument_index).is_loadable_constant(), 3526 "argument_index %u has bad constant type in class file %s", 3527 argument_index, 3528 CHECK); 3529 entry->set_argument(argi, argument_index); 3530 } 3531 } 3532 cp->bsm_entries().end_extension(iter, _loader_data, CHECK); 3533 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(), 3534 "Bad length on BootstrapMethods in class file %s", 3535 CHECK); 3536 } 3537 3538 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3539 ConstantPool* cp, 3540 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3541 TRAPS) { 3542 assert(cfs != nullptr, "invariant"); 3543 assert(cp != nullptr, "invariant"); 3544 assert(parsed_annotations != nullptr, "invariant"); 3545 3546 // Set inner classes attribute to default sentinel 3547 _inner_classes = Universe::the_empty_short_array(); 3548 // Set nest members attribute to default sentinel 3549 _nest_members = Universe::the_empty_short_array(); 3550 // Set _permitted_subclasses attribute to default sentinel 3551 _permitted_subclasses = Universe::the_empty_short_array(); 3552 // Set _loadable_descriptors attribute to default sentinel 3553 _loadable_descriptors = Universe::the_empty_short_array(); 3554 cfs->guarantee_more(2, CHECK); // attributes_count 3555 u2 attributes_count = cfs->get_u2_fast(); 3556 bool parsed_sourcefile_attribute = false; 3557 bool parsed_innerclasses_attribute = false; 3558 bool parsed_nest_members_attribute = false; 3559 bool parsed_permitted_subclasses_attribute = false; 3560 bool parsed_loadable_descriptors_attribute = false; 3561 bool parsed_nest_host_attribute = false; 3562 bool parsed_record_attribute = false; 3563 bool parsed_enclosingmethod_attribute = false; 3564 bool parsed_bootstrap_methods_attribute = false; 3565 const u1* runtime_visible_annotations = nullptr; 3566 int runtime_visible_annotations_length = 0; 3567 const u1* runtime_visible_type_annotations = nullptr; 3568 int runtime_visible_type_annotations_length = 0; 3569 bool runtime_invisible_type_annotations_exists = false; 3570 bool runtime_invisible_annotations_exists = false; 3571 bool parsed_source_debug_ext_annotations_exist = false; 3572 const u1* inner_classes_attribute_start = nullptr; 3573 u4 inner_classes_attribute_length = 0; 3574 u2 enclosing_method_class_index = 0; 3575 u2 enclosing_method_method_index = 0; 3576 const u1* nest_members_attribute_start = nullptr; 3577 u4 nest_members_attribute_length = 0; 3578 const u1* record_attribute_start = nullptr; 3579 u4 record_attribute_length = 0; 3580 const u1* permitted_subclasses_attribute_start = nullptr; 3581 u4 permitted_subclasses_attribute_length = 0; 3582 const u1* loadable_descriptors_attribute_start = nullptr; 3583 u4 loadable_descriptors_attribute_length = 0; 3584 3585 // Iterate over attributes 3586 while (attributes_count--) { 3587 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3588 const u2 attribute_name_index = cfs->get_u2_fast(); 3589 const u4 attribute_length = cfs->get_u4_fast(); 3590 guarantee_property( 3591 valid_symbol_at(attribute_name_index), 3592 "Attribute name has bad constant pool index %u in class file %s", 3593 attribute_name_index, CHECK); 3594 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3595 if (tag == vmSymbols::tag_source_file()) { 3596 // Check for SourceFile tag 3597 if (_need_verify) { 3598 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3599 } 3600 if (parsed_sourcefile_attribute) { 3601 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD); 3602 return; 3603 } else { 3604 parsed_sourcefile_attribute = true; 3605 } 3606 parse_classfile_sourcefile_attribute(cfs, CHECK); 3607 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3608 // Check for SourceDebugExtension tag 3609 if (parsed_source_debug_ext_annotations_exist) { 3610 classfile_parse_error( 3611 "Multiple SourceDebugExtension attributes in class file %s", THREAD); 3612 return; 3613 } 3614 parsed_source_debug_ext_annotations_exist = true; 3615 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3616 } else if (tag == vmSymbols::tag_inner_classes()) { 3617 // Check for InnerClasses tag 3618 if (parsed_innerclasses_attribute) { 3619 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD); 3620 return; 3621 } else { 3622 parsed_innerclasses_attribute = true; 3623 } 3624 inner_classes_attribute_start = cfs->current(); 3625 inner_classes_attribute_length = attribute_length; 3626 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3627 } else if (tag == vmSymbols::tag_synthetic()) { 3628 // Check for Synthetic tag 3629 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3630 if (attribute_length != 0) { 3631 classfile_parse_error( 3632 "Invalid Synthetic classfile attribute length %u in class file %s", 3633 attribute_length, THREAD); 3634 return; 3635 } 3636 parse_classfile_synthetic_attribute(); 3637 } else if (tag == vmSymbols::tag_deprecated()) { 3638 // Check for Deprecated tag - 4276120 3639 if (attribute_length != 0) { 3640 classfile_parse_error( 3641 "Invalid Deprecated classfile attribute length %u in class file %s", 3642 attribute_length, THREAD); 3643 return; 3644 } 3645 } else if (_major_version >= JAVA_1_5_VERSION) { 3646 if (tag == vmSymbols::tag_signature()) { 3647 if (_generic_signature_index != 0) { 3648 classfile_parse_error( 3649 "Multiple Signature attributes in class file %s", THREAD); 3650 return; 3651 } 3652 if (attribute_length != 2) { 3653 classfile_parse_error( 3654 "Wrong Signature attribute length %u in class file %s", 3655 attribute_length, THREAD); 3656 return; 3657 } 3658 parse_classfile_signature_attribute(cfs, CHECK); 3659 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3660 if (runtime_visible_annotations != nullptr) { 3661 classfile_parse_error( 3662 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD); 3663 return; 3664 } 3665 runtime_visible_annotations_length = attribute_length; 3666 runtime_visible_annotations = cfs->current(); 3667 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 3668 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3669 parse_annotations(cp, 3670 runtime_visible_annotations, 3671 runtime_visible_annotations_length, 3672 parsed_annotations, 3673 _loader_data, 3674 _can_access_vm_annotations); 3675 cfs->skip_u1_fast(runtime_visible_annotations_length); 3676 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3677 if (runtime_invisible_annotations_exists) { 3678 classfile_parse_error( 3679 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD); 3680 return; 3681 } 3682 runtime_invisible_annotations_exists = true; 3683 cfs->skip_u1(attribute_length, CHECK); 3684 } else if (tag == vmSymbols::tag_enclosing_method()) { 3685 if (parsed_enclosingmethod_attribute) { 3686 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD); 3687 return; 3688 } else { 3689 parsed_enclosingmethod_attribute = true; 3690 } 3691 guarantee_property(attribute_length == 4, 3692 "Wrong EnclosingMethod attribute length %u in class file %s", 3693 attribute_length, CHECK); 3694 cfs->guarantee_more(4, CHECK); // class_index, method_index 3695 enclosing_method_class_index = cfs->get_u2_fast(); 3696 enclosing_method_method_index = cfs->get_u2_fast(); 3697 if (enclosing_method_class_index == 0) { 3698 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD); 3699 return; 3700 } 3701 // Validate the constant pool indices and types 3702 guarantee_property(valid_klass_reference_at(enclosing_method_class_index), 3703 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3704 if (enclosing_method_method_index != 0 && 3705 (!cp->is_within_bounds(enclosing_method_method_index) || 3706 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3707 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD); 3708 return; 3709 } 3710 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3711 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3712 if (parsed_bootstrap_methods_attribute) { 3713 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD); 3714 return; 3715 } 3716 parsed_bootstrap_methods_attribute = true; 3717 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3718 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3719 if (runtime_visible_type_annotations != nullptr) { 3720 classfile_parse_error( 3721 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD); 3722 return; 3723 } 3724 runtime_visible_type_annotations_length = attribute_length; 3725 runtime_visible_type_annotations = cfs->current(); 3726 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 3727 // No need for the VM to parse Type annotations 3728 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3729 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3730 if (runtime_invisible_type_annotations_exists) { 3731 classfile_parse_error( 3732 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD); 3733 return; 3734 } 3735 runtime_invisible_type_annotations_exists = true; 3736 cfs->skip_u1(attribute_length, CHECK); 3737 } else if (_major_version >= JAVA_11_VERSION) { 3738 if (tag == vmSymbols::tag_nest_members()) { 3739 // Check for NestMembers tag 3740 if (parsed_nest_members_attribute) { 3741 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD); 3742 return; 3743 } else { 3744 parsed_nest_members_attribute = true; 3745 } 3746 if (parsed_nest_host_attribute) { 3747 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD); 3748 return; 3749 } 3750 nest_members_attribute_start = cfs->current(); 3751 nest_members_attribute_length = attribute_length; 3752 cfs->skip_u1(nest_members_attribute_length, CHECK); 3753 } else if (tag == vmSymbols::tag_nest_host()) { 3754 if (parsed_nest_host_attribute) { 3755 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD); 3756 return; 3757 } else { 3758 parsed_nest_host_attribute = true; 3759 } 3760 if (parsed_nest_members_attribute) { 3761 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD); 3762 return; 3763 } 3764 if (_need_verify) { 3765 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3766 } 3767 cfs->guarantee_more(2, CHECK); 3768 u2 class_info_index = cfs->get_u2_fast(); 3769 guarantee_property( 3770 valid_klass_reference_at(class_info_index), 3771 "Nest-host class_info_index %u has bad constant type in class file %s", 3772 class_info_index, CHECK); 3773 _nest_host = class_info_index; 3774 3775 } else if (_major_version >= JAVA_16_VERSION) { 3776 if (tag == vmSymbols::tag_record()) { 3777 if (parsed_record_attribute) { 3778 classfile_parse_error("Multiple Record attributes in class file %s", THREAD); 3779 return; 3780 } 3781 parsed_record_attribute = true; 3782 record_attribute_start = cfs->current(); 3783 record_attribute_length = attribute_length; 3784 } else if (_major_version >= JAVA_17_VERSION) { 3785 if (tag == vmSymbols::tag_permitted_subclasses()) { 3786 if (parsed_permitted_subclasses_attribute) { 3787 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK); 3788 return; 3789 } 3790 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute. 3791 if (_access_flags.is_final()) { 3792 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK); 3793 return; 3794 } 3795 parsed_permitted_subclasses_attribute = true; 3796 permitted_subclasses_attribute_start = cfs->current(); 3797 permitted_subclasses_attribute_length = attribute_length; 3798 } 3799 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) { 3800 if (parsed_loadable_descriptors_attribute) { 3801 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK); 3802 return; 3803 } 3804 parsed_loadable_descriptors_attribute = true; 3805 loadable_descriptors_attribute_start = cfs->current(); 3806 loadable_descriptors_attribute_length = attribute_length; 3807 } 3808 } 3809 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION 3810 cfs->skip_u1(attribute_length, CHECK); 3811 } else { 3812 // Unknown attribute 3813 cfs->skip_u1(attribute_length, CHECK); 3814 } 3815 } else { 3816 // Unknown attribute 3817 cfs->skip_u1(attribute_length, CHECK); 3818 } 3819 } else { 3820 // Unknown attribute 3821 cfs->skip_u1(attribute_length, CHECK); 3822 } 3823 } 3824 _class_annotations = allocate_annotations(runtime_visible_annotations, 3825 runtime_visible_annotations_length, 3826 CHECK); 3827 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations, 3828 runtime_visible_type_annotations_length, 3829 CHECK); 3830 3831 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3832 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3833 cfs, 3834 cp, 3835 inner_classes_attribute_start, 3836 parsed_innerclasses_attribute, 3837 enclosing_method_class_index, 3838 enclosing_method_method_index, 3839 CHECK); 3840 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3841 guarantee_property( 3842 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3843 "Wrong InnerClasses attribute length in class file %s", CHECK); 3844 } 3845 } 3846 3847 if (parsed_nest_members_attribute) { 3848 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3849 cfs, 3850 nest_members_attribute_start, 3851 CHECK); 3852 if (_need_verify) { 3853 guarantee_property( 3854 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3855 "Wrong NestMembers attribute length in class file %s", CHECK); 3856 } 3857 } 3858 3859 if (parsed_record_attribute) { 3860 const unsigned int calculated_attr_length = parse_classfile_record_attribute( 3861 cfs, 3862 cp, 3863 record_attribute_start, 3864 CHECK); 3865 if (_need_verify) { 3866 guarantee_property(record_attribute_length == calculated_attr_length, 3867 "Record attribute has wrong length in class file %s", 3868 CHECK); 3869 } 3870 } 3871 3872 if (parsed_permitted_subclasses_attribute) { 3873 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute( 3874 cfs, 3875 permitted_subclasses_attribute_start, 3876 CHECK); 3877 if (_need_verify) { 3878 guarantee_property( 3879 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses, 3880 "Wrong PermittedSubclasses attribute length in class file %s", CHECK); 3881 } 3882 } 3883 3884 if (parsed_loadable_descriptors_attribute) { 3885 const u2 num_classes = parse_classfile_loadable_descriptors_attribute( 3886 cfs, 3887 loadable_descriptors_attribute_start, 3888 CHECK); 3889 if (_need_verify) { 3890 guarantee_property( 3891 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes, 3892 "Wrong LoadableDescriptors attribute length in class file %s", CHECK); 3893 } 3894 } 3895 3896 if (_max_bootstrap_specifier_index >= 0) { 3897 guarantee_property(parsed_bootstrap_methods_attribute, 3898 "Missing BootstrapMethods attribute in class file %s", CHECK); 3899 } 3900 } 3901 3902 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3903 assert(k != nullptr, "invariant"); 3904 3905 if (_synthetic_flag) 3906 k->set_is_synthetic(); 3907 if (_sourcefile_index != 0) { 3908 k->set_source_file_name_index(_sourcefile_index); 3909 } 3910 if (_generic_signature_index != 0) { 3911 k->set_generic_signature_index(_generic_signature_index); 3912 } 3913 if (_sde_buffer != nullptr) { 3914 k->set_source_debug_extension(_sde_buffer, _sde_length); 3915 } 3916 } 3917 3918 // Create the Annotations object that will 3919 // hold the annotations array for the Klass. 3920 void ClassFileParser::create_combined_annotations(TRAPS) { 3921 if (_class_annotations == nullptr && 3922 _class_type_annotations == nullptr && 3923 _fields_annotations == nullptr && 3924 _fields_type_annotations == nullptr) { 3925 // Don't create the Annotations object unnecessarily. 3926 return; 3927 } 3928 3929 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3930 annotations->set_class_annotations(_class_annotations); 3931 annotations->set_class_type_annotations(_class_type_annotations); 3932 annotations->set_fields_annotations(_fields_annotations); 3933 annotations->set_fields_type_annotations(_fields_type_annotations); 3934 3935 // This is the Annotations object that will be 3936 // assigned to InstanceKlass being constructed. 3937 _combined_annotations = annotations; 3938 3939 // The annotations arrays below has been transferred the 3940 // _combined_annotations so these fields can now be cleared. 3941 _class_annotations = nullptr; 3942 _class_type_annotations = nullptr; 3943 _fields_annotations = nullptr; 3944 _fields_type_annotations = nullptr; 3945 } 3946 3947 // Transfer ownership of metadata allocated to the InstanceKlass. 3948 void ClassFileParser::apply_parsed_class_metadata( 3949 InstanceKlass* this_klass, 3950 int java_fields_count) { 3951 assert(this_klass != nullptr, "invariant"); 3952 3953 _cp->set_pool_holder(this_klass); 3954 this_klass->set_constants(_cp); 3955 this_klass->set_fieldinfo_stream(_fieldinfo_stream); 3956 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table); 3957 this_klass->set_fields_status(_fields_status); 3958 this_klass->set_methods(_methods); 3959 this_klass->set_inner_classes(_inner_classes); 3960 this_klass->set_nest_members(_nest_members); 3961 this_klass->set_nest_host_index(_nest_host); 3962 this_klass->set_loadable_descriptors(_loadable_descriptors); 3963 this_klass->set_annotations(_combined_annotations); 3964 this_klass->set_permitted_subclasses(_permitted_subclasses); 3965 this_klass->set_record_components(_record_components); 3966 this_klass->set_inline_layout_info_array(_inline_layout_info_array); 3967 3968 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table)); 3969 3970 // Delay the setting of _local_interfaces and _transitive_interfaces until after 3971 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could 3972 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with 3973 // its _super. If an OOM occurs while loading the current klass, its _super field 3974 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3975 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3976 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3977 3978 // Clear out these fields so they don't get deallocated by the destructor 3979 clear_class_metadata(); 3980 } 3981 3982 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno, 3983 int anno_length, 3984 TRAPS) { 3985 AnnotationArray* annotations = nullptr; 3986 if (anno != nullptr) { 3987 annotations = MetadataFactory::new_array<u1>(_loader_data, 3988 anno_length, 3989 CHECK_(annotations)); 3990 for (int i = 0; i < anno_length; i++) { 3991 annotations->at_put(i, anno[i]); 3992 } 3993 } 3994 return annotations; 3995 } 3996 3997 void ClassFileParser::check_super_class(ConstantPool* const cp, 3998 const int super_class_index, 3999 const bool need_verify, 4000 TRAPS) { 4001 assert(cp != nullptr, "invariant"); 4002 4003 if (super_class_index == 0) { 4004 guarantee_property(_class_name == vmSymbols::java_lang_Object(), 4005 "Invalid superclass index 0 in class file %s", 4006 CHECK); 4007 } else { 4008 guarantee_property(valid_klass_reference_at(super_class_index), 4009 "Invalid superclass index %u in class file %s", 4010 super_class_index, 4011 CHECK); 4012 4013 // The class name should be legal because it is checked when parsing constant pool. 4014 // However, make sure it is not an array type. 4015 if (need_verify) { 4016 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY, 4017 "Bad superclass name in class file %s", CHECK); 4018 } 4019 } 4020 } 4021 4022 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) { 4023 _max_nonstatic_oop_maps = max_blocks; 4024 _nonstatic_oop_map_count = 0; 4025 if (max_blocks == 0) { 4026 _nonstatic_oop_maps = nullptr; 4027 } else { 4028 _nonstatic_oop_maps = 4029 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps); 4030 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); 4031 } 4032 } 4033 4034 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const { 4035 assert(_nonstatic_oop_map_count > 0, "Has no oop maps"); 4036 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1); 4037 } 4038 4039 // addition of super oop maps 4040 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { 4041 assert(nof_blocks && _nonstatic_oop_map_count == 0 && 4042 nof_blocks <= _max_nonstatic_oop_maps, "invariant"); 4043 4044 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); 4045 _nonstatic_oop_map_count += nof_blocks; 4046 } 4047 4048 // collection of oops 4049 void OopMapBlocksBuilder::add(int offset, int count) { 4050 if (_nonstatic_oop_map_count == 0) { 4051 _nonstatic_oop_map_count++; 4052 } 4053 OopMapBlock* nonstatic_oop_map = last_oop_map(); 4054 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up 4055 nonstatic_oop_map->set_offset(offset); 4056 nonstatic_oop_map->set_count(count); 4057 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add 4058 nonstatic_oop_map->increment_count(count); 4059 } else { // Need a new one... 4060 _nonstatic_oop_map_count++; 4061 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check"); 4062 nonstatic_oop_map = last_oop_map(); 4063 nonstatic_oop_map->set_offset(offset); 4064 nonstatic_oop_map->set_count(count); 4065 } 4066 } 4067 4068 // general purpose copy, e.g. into allocated instanceKlass 4069 void OopMapBlocksBuilder::copy(OopMapBlock* dst) { 4070 if (_nonstatic_oop_map_count != 0) { 4071 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count); 4072 } 4073 } 4074 4075 // Sort and compact adjacent blocks 4076 void OopMapBlocksBuilder::compact() { 4077 if (_nonstatic_oop_map_count <= 1) { 4078 return; 4079 } 4080 /* 4081 * Since field layout sneaks in oops before values, we will be able to condense 4082 * blocks. There is potential to compact between super, own refs and values 4083 * containing refs. 4084 * 4085 * Currently compaction is slightly limited due to values being 8 byte aligned. 4086 * This may well change: FixMe if it doesn't, the code below is fairly general purpose 4087 * and maybe it doesn't need to be. 4088 */ 4089 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock), 4090 (_sort_Fn)OopMapBlock::compare_offset); 4091 if (_nonstatic_oop_map_count < 2) { 4092 return; 4093 } 4094 4095 // Make a temp copy, and iterate through and copy back into the original 4096 ResourceMark rm; 4097 OopMapBlock* oop_maps_copy = 4098 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count); 4099 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count; 4100 copy(oop_maps_copy); 4101 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps; 4102 unsigned int new_count = 1; 4103 oop_maps_copy++; 4104 while(oop_maps_copy < oop_maps_copy_end) { 4105 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); 4106 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { 4107 nonstatic_oop_map->increment_count(oop_maps_copy->count()); 4108 } else { 4109 nonstatic_oop_map++; 4110 new_count++; 4111 nonstatic_oop_map->set_offset(oop_maps_copy->offset()); 4112 nonstatic_oop_map->set_count(oop_maps_copy->count()); 4113 } 4114 oop_maps_copy++; 4115 } 4116 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?"); 4117 _nonstatic_oop_map_count = new_count; 4118 } 4119 4120 void OopMapBlocksBuilder::print_on(outputStream* st) const { 4121 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps); 4122 if (_nonstatic_oop_map_count > 0) { 4123 OopMapBlock* map = _nonstatic_oop_maps; 4124 OopMapBlock* last_map = last_oop_map(); 4125 assert(map <= last_map, "Last less than first"); 4126 while (map <= last_map) { 4127 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), 4128 map->offset() + map->offset_span() - heapOopSize, map->count()); 4129 map++; 4130 } 4131 } 4132 } 4133 4134 void OopMapBlocksBuilder::print_value_on(outputStream* st) const { 4135 print_on(st); 4136 } 4137 4138 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4139 assert(ik != nullptr, "invariant"); 4140 4141 const InstanceKlass* const super = ik->super(); 4142 4143 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4144 // in which case we don't have to register objects as finalizable 4145 if (!_has_empty_finalizer) { 4146 if (_has_finalizer || 4147 (super != nullptr && super->has_finalizer())) { 4148 ik->set_has_finalizer(); 4149 } 4150 } 4151 4152 #ifdef ASSERT 4153 bool f = false; 4154 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4155 vmSymbols::void_method_signature()); 4156 if (InstanceKlass::is_finalization_enabled() && 4157 (m != nullptr) && !m->is_empty_method()) { 4158 f = true; 4159 } 4160 4161 // Spec doesn't prevent agent from redefinition of empty finalizer. 4162 // Despite the fact that it's generally bad idea and redefined finalizer 4163 // will not work as expected we shouldn't abort vm in this case 4164 if (!ik->has_redefined_this_or_super()) { 4165 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4166 } 4167 #endif 4168 4169 // Check if this klass supports the java.lang.Cloneable interface 4170 if (vmClasses::Cloneable_klass_is_loaded()) { 4171 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) { 4172 ik->set_is_cloneable(); 4173 } 4174 } 4175 4176 // If it cannot be fast-path allocated, set a bit in the layout helper. 4177 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4178 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4179 if (ik->is_abstract() || ik->is_interface() 4180 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr) 4181 || ik->size_helper() >= FastAllocateSizeLimit) { 4182 // Forbid fast-path allocation. 4183 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4184 ik->set_layout_helper(lh); 4185 } 4186 4187 // Propagate the AOT runtimeSetup method discovery 4188 if (_has_aot_runtime_setup_method) { 4189 ik->set_is_runtime_setup_required(); 4190 if (log_is_enabled(Info, aot, init)) { 4191 ResourceMark rm; 4192 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name()); 4193 } 4194 } 4195 } 4196 4197 bool ClassFileParser::supports_inline_types() const { 4198 // Inline types are only supported by class file version 71.65535 and later 4199 return _major_version > JAVA_27_VERSION || 4200 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION); 4201 } 4202 4203 // utility methods for appending an array with check for duplicates 4204 4205 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4206 const Array<InstanceKlass*>* const ifs) { 4207 // iterate over new interfaces 4208 for (int i = 0; i < ifs->length(); i++) { 4209 InstanceKlass* const e = ifs->at(i); 4210 assert(e->is_klass() && e->is_interface(), "just checking"); 4211 // add new interface 4212 result->append_if_missing(e); 4213 } 4214 } 4215 4216 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4217 Array<InstanceKlass*>* local_ifs, 4218 ClassLoaderData* loader_data, 4219 TRAPS) { 4220 assert(local_ifs != nullptr, "invariant"); 4221 assert(loader_data != nullptr, "invariant"); 4222 4223 // Compute maximum size for transitive interfaces 4224 int max_transitive_size = 0; 4225 int super_size = 0; 4226 // Add superclass transitive interfaces size 4227 if (super != nullptr) { 4228 super_size = super->transitive_interfaces()->length(); 4229 max_transitive_size += super_size; 4230 } 4231 // Add local interfaces' super interfaces 4232 const int local_size = local_ifs->length(); 4233 for (int i = 0; i < local_size; i++) { 4234 InstanceKlass* const l = local_ifs->at(i); 4235 max_transitive_size += l->transitive_interfaces()->length(); 4236 } 4237 // Finally add local interfaces 4238 max_transitive_size += local_size; 4239 // Construct array 4240 if (max_transitive_size == 0) { 4241 // no interfaces, use canonicalized array 4242 return Universe::the_empty_instance_klass_array(); 4243 } else if (max_transitive_size == super_size) { 4244 // no new local interfaces added, share superklass' transitive interface array 4245 return super->transitive_interfaces(); 4246 } else if (max_transitive_size == local_size) { 4247 // only local interfaces added, share local interface array 4248 return local_ifs; 4249 } else { 4250 ResourceMark rm; 4251 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4252 4253 // Copy down from superclass 4254 if (super != nullptr) { 4255 append_interfaces(result, super->transitive_interfaces()); 4256 } 4257 4258 // Copy down from local interfaces' superinterfaces 4259 for (int i = 0; i < local_size; i++) { 4260 InstanceKlass* const l = local_ifs->at(i); 4261 append_interfaces(result, l->transitive_interfaces()); 4262 } 4263 // Finally add local interfaces 4264 append_interfaces(result, local_ifs); 4265 4266 // length will be less than the max_transitive_size if duplicates were removed 4267 const int length = result->length(); 4268 assert(length <= max_transitive_size, "just checking"); 4269 4270 Array<InstanceKlass*>* const new_result = 4271 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4272 for (int i = 0; i < length; i++) { 4273 InstanceKlass* const e = result->at(i); 4274 assert(e != nullptr, "just checking"); 4275 new_result->at_put(i, e); 4276 } 4277 return new_result; 4278 } 4279 } 4280 4281 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4282 assert(this_klass != nullptr, "invariant"); 4283 const InstanceKlass* const super = this_klass->super(); 4284 4285 if (super != nullptr) { 4286 if (super->is_final()) { 4287 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD); 4288 return; 4289 } 4290 4291 if (super->is_sealed()) { 4292 stringStream ss; 4293 ResourceMark rm(THREAD); 4294 if (!super->has_as_permitted_subclass(this_klass, ss)) { 4295 classfile_icce_error(ss.as_string(), THREAD); 4296 return; 4297 } 4298 } 4299 4300 // The JVMS says that super classes for value types must not have the ACC_IDENTITY 4301 // flag set. But, java.lang.Object must still be allowed to be a direct super class 4302 // for a value classes. So, it is treated as a special case for now. 4303 if (!this_klass->access_flags().is_identity_class() && 4304 super->name() != vmSymbols::java_lang_Object() && 4305 super->is_identity_class()) { 4306 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD); 4307 return; 4308 } 4309 4310 Reflection::VerifyClassAccessResults vca_result = 4311 Reflection::verify_class_access(this_klass, super, false); 4312 if (vca_result != Reflection::ACCESS_OK) { 4313 ResourceMark rm(THREAD); 4314 char* msg = Reflection::verify_class_access_msg(this_klass, 4315 super, 4316 vca_result); 4317 4318 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4319 if (msg == nullptr) { 4320 bool same_module = (this_klass->module() == super->module()); 4321 Exceptions::fthrow( 4322 THREAD_AND_LOCATION, 4323 vmSymbols::java_lang_IllegalAccessError(), 4324 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4325 this_klass->external_name(), 4326 super->is_abstract() ? "abstract " : "", 4327 super->external_name(), 4328 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4329 (same_module) ? "" : "; ", 4330 (same_module) ? "" : super->class_in_module_of_loader()); 4331 } else { 4332 // Add additional message content. 4333 Exceptions::fthrow( 4334 THREAD_AND_LOCATION, 4335 vmSymbols::java_lang_IllegalAccessError(), 4336 "superclass access check failed: %s", 4337 msg); 4338 } 4339 } 4340 } 4341 } 4342 4343 4344 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4345 assert(this_klass != nullptr, "invariant"); 4346 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4347 const int lng = local_interfaces->length(); 4348 for (int i = lng - 1; i >= 0; i--) { 4349 InstanceKlass* const k = local_interfaces->at(i); 4350 assert (k != nullptr && k->is_interface(), "invalid interface"); 4351 4352 if (k->is_sealed()) { 4353 stringStream ss; 4354 ResourceMark rm(THREAD); 4355 if (!k->has_as_permitted_subclass(this_klass, ss)) { 4356 classfile_icce_error(ss.as_string(), THREAD); 4357 return; 4358 } 4359 } 4360 4361 Reflection::VerifyClassAccessResults vca_result = 4362 Reflection::verify_class_access(this_klass, k, false); 4363 if (vca_result != Reflection::ACCESS_OK) { 4364 ResourceMark rm(THREAD); 4365 char* msg = Reflection::verify_class_access_msg(this_klass, 4366 k, 4367 vca_result); 4368 4369 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4370 if (msg == nullptr) { 4371 bool same_module = (this_klass->module() == k->module()); 4372 Exceptions::fthrow( 4373 THREAD_AND_LOCATION, 4374 vmSymbols::java_lang_IllegalAccessError(), 4375 "class %s cannot access its superinterface %s (%s%s%s)", 4376 this_klass->external_name(), 4377 k->external_name(), 4378 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4379 (same_module) ? "" : "; ", 4380 (same_module) ? "" : k->class_in_module_of_loader()); 4381 return; 4382 } else { 4383 // Add additional message content. 4384 Exceptions::fthrow( 4385 THREAD_AND_LOCATION, 4386 vmSymbols::java_lang_IllegalAccessError(), 4387 "superinterface check failed: %s", 4388 msg); 4389 return; 4390 } 4391 } 4392 } 4393 } 4394 4395 4396 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4397 assert(this_klass != nullptr, "invariant"); 4398 const Array<Method*>* const methods = this_klass->methods(); 4399 const int num_methods = methods->length(); 4400 4401 // go thru each method and check if it overrides a final method 4402 for (int index = 0; index < num_methods; index++) { 4403 const Method* const m = methods->at(index); 4404 4405 // skip private, static, and <init> methods 4406 if ((!m->is_private() && !m->is_static()) && 4407 (m->name() != vmSymbols::object_initializer_name())) { 4408 4409 const Symbol* const name = m->name(); 4410 const Symbol* const signature = m->signature(); 4411 const InstanceKlass* k = this_klass->super(); 4412 const Method* super_m = nullptr; 4413 while (k != nullptr) { 4414 // skip supers that don't have final methods. 4415 if (k->has_final_method()) { 4416 // lookup a matching method in the super class hierarchy 4417 super_m = k->lookup_method(name, signature); 4418 if (super_m == nullptr) { 4419 break; // didn't find any match; get out 4420 } 4421 4422 if (super_m->is_final() && !super_m->is_static() && 4423 !super_m->access_flags().is_private()) { 4424 // matching method in super is final, and not static or private 4425 bool can_access = Reflection::verify_member_access(this_klass, 4426 super_m->method_holder(), 4427 super_m->method_holder(), 4428 super_m->access_flags(), 4429 false, false, CHECK); 4430 if (can_access) { 4431 // this class can access super final method and therefore override 4432 ResourceMark rm(THREAD); 4433 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 4434 err_msg("class %s overrides final method %s.%s%s", 4435 this_klass->external_name(), 4436 super_m->method_holder()->external_name(), 4437 name->as_C_string(), 4438 signature->as_C_string())); 4439 } 4440 } 4441 4442 // continue to look from super_m's holder's super. 4443 k = super_m->method_holder()->super(); 4444 continue; 4445 } 4446 4447 k = k->super(); 4448 } 4449 } 4450 } 4451 } 4452 4453 4454 // assumes that this_klass is an interface 4455 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4456 assert(this_klass != nullptr, "invariant"); 4457 assert(this_klass->is_interface(), "not an interface"); 4458 const Array<Method*>* methods = this_klass->methods(); 4459 const int num_methods = methods->length(); 4460 4461 for (int index = 0; index < num_methods; index++) { 4462 const Method* const m = methods->at(index); 4463 // if m is static and not the init method, throw a verify error 4464 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4465 ResourceMark rm(THREAD); 4466 4467 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4468 Exceptions::fthrow( 4469 THREAD_AND_LOCATION, 4470 vmSymbols::java_lang_VerifyError(), 4471 "Illegal static method %s in interface %s", 4472 m->name()->as_C_string(), 4473 this_klass->external_name() 4474 ); 4475 return; 4476 } 4477 } 4478 } 4479 4480 // utility methods for format checking 4481 4482 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null. 4483 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const { 4484 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4485 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4486 if (is_module) { 4487 ResourceMark rm(THREAD); 4488 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4489 Exceptions::fthrow( 4490 THREAD_AND_LOCATION, 4491 vmSymbols::java_lang_NoClassDefFoundError(), 4492 "%s is not a class because access_flag ACC_MODULE is set", 4493 _class_name->as_C_string()); 4494 return; 4495 } 4496 4497 if (!_need_verify) { return; } 4498 4499 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4500 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4501 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4502 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0; 4503 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4504 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4505 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4506 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final)); 4507 4508 if ((is_abstract && is_final) || 4509 (is_interface && !is_abstract) || 4510 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces 4511 (!is_interface && major_gte_1_5 && is_annotation) || 4512 (!valid_value_class)) { 4513 ResourceMark rm(THREAD); 4514 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4515 if (inner_name == nullptr && !is_anonymous_inner_class) { 4516 Exceptions::fthrow( 4517 THREAD_AND_LOCATION, 4518 vmSymbols::java_lang_ClassFormatError(), 4519 "Illegal class modifiers in class %s: 0x%X", 4520 _class_name->as_C_string(), flags 4521 ); 4522 } else { 4523 if (is_anonymous_inner_class) { 4524 Exceptions::fthrow( 4525 THREAD_AND_LOCATION, 4526 vmSymbols::java_lang_ClassFormatError(), 4527 "Illegal class modifiers in anonymous inner class of class %s: 0x%X", 4528 _class_name->as_C_string(), flags 4529 ); 4530 } else { 4531 Exceptions::fthrow( 4532 THREAD_AND_LOCATION, 4533 vmSymbols::java_lang_ClassFormatError(), 4534 "Illegal class modifiers in inner class %s of class %s: 0x%X", 4535 inner_name->as_C_string(), _class_name->as_C_string(), flags 4536 ); 4537 } 4538 } 4539 return; 4540 } 4541 } 4542 4543 static bool has_illegal_visibility(jint flags) { 4544 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4545 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4546 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4547 4548 return ((is_public && is_protected) || 4549 (is_public && is_private) || 4550 (is_protected && is_private)); 4551 } 4552 4553 // A legal major_version.minor_version must be one of the following: 4554 // 4555 // Major_version >= 45 and major_version < 56, any minor_version. 4556 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. 4557 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. 4558 // 4559 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4560 ResourceMark rm(THREAD); 4561 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4562 if (major < JAVA_MIN_SUPPORTED_VERSION) { 4563 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version", 4564 class_name, major, minor, THREAD); 4565 return; 4566 } 4567 4568 if (major > max_version) { 4569 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4570 Exceptions::fthrow( 4571 THREAD_AND_LOCATION, 4572 vmSymbols::java_lang_UnsupportedClassVersionError(), 4573 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4574 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4575 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4576 return; 4577 } 4578 4579 if (major < JAVA_12_VERSION || minor == 0) { 4580 return; 4581 } 4582 4583 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4584 if (major != max_version) { 4585 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4586 Exceptions::fthrow( 4587 THREAD_AND_LOCATION, 4588 vmSymbols::java_lang_UnsupportedClassVersionError(), 4589 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4590 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4591 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4592 return; 4593 } 4594 4595 if (!Arguments::enable_preview()) { 4596 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4597 class_name, major, minor, THREAD); 4598 return; 4599 } 4600 4601 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4602 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4603 class_name, major, minor, THREAD); 4604 } 4605 } 4606 4607 void ClassFileParser:: verify_legal_field_modifiers(jint flags, 4608 AccessFlags class_access_flags, 4609 TRAPS) const { 4610 if (!_need_verify) { return; } 4611 4612 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4613 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4614 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4615 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4616 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4617 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4618 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4619 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4620 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0; 4621 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4622 4623 const bool is_interface = class_access_flags.is_interface(); 4624 const bool is_identity_class = class_access_flags.is_identity_class(); 4625 4626 bool is_illegal = false; 4627 const char* error_msg = ""; 4628 4629 // There is some overlap in the checks that apply, for example interface fields 4630 // must be static, static fields can't be strict, and therefore interfaces can't 4631 // have strict fields. So we don't have to check every possible invalid combination 4632 // individually as long as all are covered. Once we have found an illegal combination 4633 // we can stop checking. 4634 4635 if (!is_illegal) { 4636 if (is_interface) { 4637 if (!is_public || !is_static || !is_final || is_private || 4638 is_protected || is_volatile || is_transient || 4639 (major_gte_1_5 && is_enum)) { 4640 is_illegal = true; 4641 error_msg = "interface fields must be public, static and final, and may be synthetic"; 4642 } 4643 } else { // not interface 4644 if (has_illegal_visibility(flags)) { 4645 is_illegal = true; 4646 error_msg = "invalid visibility flags for class field"; 4647 } else if (is_final && is_volatile) { 4648 is_illegal = true; 4649 error_msg = "fields cannot be final and volatile"; 4650 } else if (supports_inline_types()) { 4651 if (!is_identity_class && !is_static && (!is_strict || !is_final)) { 4652 is_illegal = true; 4653 error_msg = "value class fields must be either non-static final and strict, or static"; 4654 } 4655 } 4656 } 4657 } 4658 4659 if (is_illegal) { 4660 ResourceMark rm(THREAD); 4661 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4662 Exceptions::fthrow( 4663 THREAD_AND_LOCATION, 4664 vmSymbols::java_lang_ClassFormatError(), 4665 "Illegal field modifiers (%s) in class %s: 0x%X", 4666 error_msg, _class_name->as_C_string(), flags); 4667 return; 4668 } 4669 } 4670 4671 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4672 AccessFlags class_access_flags, 4673 const Symbol* name, 4674 TRAPS) const { 4675 if (!_need_verify) { return; } 4676 4677 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4678 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4679 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4680 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4681 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4682 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4683 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4684 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4685 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4686 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4687 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4688 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4689 const bool major_gte_17 = _major_version >= JAVA_17_VERSION; 4690 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4691 const bool is_interface = class_access_flags.is_interface(); 4692 const bool is_identity_class = class_access_flags.is_identity_class(); 4693 4694 bool is_illegal = false; 4695 const char* class_note = ""; 4696 4697 if (is_interface) { 4698 if (major_gte_8) { 4699 // Class file version is JAVA_8_VERSION or later Methods of 4700 // interfaces may set any of the flags except ACC_PROTECTED, 4701 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4702 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4703 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4704 (is_native || is_protected || is_final || is_synchronized) || 4705 // If a specific method of a class or interface has its 4706 // ACC_ABSTRACT flag set, it must not have any of its 4707 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4708 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4709 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4710 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4711 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) { 4712 is_illegal = true; 4713 } 4714 } else if (major_gte_1_5) { 4715 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4716 if (!is_public || is_private || is_protected || is_static || is_final || 4717 is_synchronized || is_native || !is_abstract || is_strict) { 4718 is_illegal = true; 4719 } 4720 } else { 4721 // Class file version is pre-JAVA_1_5_VERSION 4722 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4723 is_illegal = true; 4724 } 4725 } 4726 } else { // not interface 4727 if (has_illegal_visibility(flags)) { 4728 is_illegal = true; 4729 } else { 4730 if (is_initializer) { 4731 if (is_static || is_final || is_synchronized || is_native || 4732 is_abstract || (major_gte_1_5 && is_bridge)) { 4733 is_illegal = true; 4734 } 4735 } else { // not initializer 4736 if (!is_identity_class && is_synchronized && !is_static) { 4737 is_illegal = true; 4738 class_note = " (not an identity class)"; 4739 } else { 4740 if (is_abstract) { 4741 if ((is_final || is_native || is_private || is_static || 4742 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) { 4743 is_illegal = true; 4744 } 4745 } 4746 } 4747 } 4748 } 4749 } 4750 4751 if (is_illegal) { 4752 ResourceMark rm(THREAD); 4753 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4754 Exceptions::fthrow( 4755 THREAD_AND_LOCATION, 4756 vmSymbols::java_lang_ClassFormatError(), 4757 "Method %s in class %s%s has illegal modifiers: 0x%X", 4758 name->as_C_string(), _class_name->as_C_string(), class_note, flags); 4759 return; 4760 } 4761 } 4762 4763 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 4764 int length, 4765 TRAPS) const { 4766 assert(_need_verify, "only called when _need_verify is true"); 4767 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP. 4768 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) { 4769 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD); 4770 } 4771 } 4772 4773 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4774 // In class names, '/' separates unqualified names. This is verified in this function also. 4775 // Method names also may not contain the characters '<' or '>', unless <init> 4776 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4777 // method. Because these names have been checked as special cases before 4778 // calling this method in verify_legal_method_name. 4779 // 4780 // This method is also called from the modular system APIs in modules.cpp 4781 // to verify the validity of module and package names. 4782 bool ClassFileParser::verify_unqualified_name(const char* name, 4783 unsigned int length, 4784 int type) { 4785 if (length == 0) return false; // Must have at least one char. 4786 for (const char* p = name; p != name + length; p++) { 4787 switch(*p) { 4788 case JVM_SIGNATURE_DOT: 4789 case JVM_SIGNATURE_ENDCLASS: 4790 case JVM_SIGNATURE_ARRAY: 4791 // do not permit '.', ';', or '[' 4792 return false; 4793 case JVM_SIGNATURE_SLASH: 4794 // check for '//' or leading or trailing '/' which are not legal 4795 // unqualified name must not be empty 4796 if (type == ClassFileParser::LegalClass) { 4797 if (p == name || p+1 >= name+length || 4798 *(p+1) == JVM_SIGNATURE_SLASH) { 4799 return false; 4800 } 4801 } else { 4802 return false; // do not permit '/' unless it's class name 4803 } 4804 break; 4805 case JVM_SIGNATURE_SPECIAL: 4806 case JVM_SIGNATURE_ENDSPECIAL: 4807 // do not permit '<' or '>' in method names 4808 if (type == ClassFileParser::LegalMethod) { 4809 return false; 4810 } 4811 } 4812 } 4813 return true; 4814 } 4815 4816 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) { 4817 if (_loadable_descriptors == nullptr) return false; 4818 for (int i = 0; i < _loadable_descriptors->length(); i++) { 4819 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i)); 4820 if (class_name == klass) return true; 4821 } 4822 return false; 4823 } 4824 4825 // Take pointer to a UTF8 byte string (not NUL-terminated). 4826 // Skip over the longest part of the string that could 4827 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true. 4828 // Return a pointer to just past the fieldname. 4829 // Return null if no fieldname at all was found, or in the case of slash_ok 4830 // being true, we saw consecutive slashes (meaning we were looking for a 4831 // qualified path but found something that was badly-formed). 4832 static const char* skip_over_field_name(const char* const name, 4833 bool slash_ok, 4834 unsigned int length) { 4835 const char* p; 4836 jboolean last_is_slash = false; 4837 jboolean not_first_ch = false; 4838 4839 for (p = name; p != name + length; not_first_ch = true) { 4840 const char* old_p = p; 4841 jchar ch = *p; 4842 if (ch < 128) { 4843 p++; 4844 // quick check for ascii 4845 if ((ch >= 'a' && ch <= 'z') || 4846 (ch >= 'A' && ch <= 'Z') || 4847 (ch == '_' || ch == '$') || 4848 (not_first_ch && ch >= '0' && ch <= '9')) { 4849 last_is_slash = false; 4850 continue; 4851 } 4852 if (slash_ok && ch == JVM_SIGNATURE_SLASH) { 4853 if (last_is_slash) { 4854 return nullptr; // Don't permit consecutive slashes 4855 } 4856 last_is_slash = true; 4857 continue; 4858 } 4859 } 4860 else { 4861 jint unicode_ch; 4862 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4863 p = tmp_p; 4864 last_is_slash = false; 4865 // Check if ch is Java identifier start or is Java identifier part 4866 // 4672820: call java.lang.Character methods directly without generating separate tables. 4867 EXCEPTION_MARK; 4868 // return value 4869 JavaValue result(T_BOOLEAN); 4870 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 4871 JavaCallArguments args; 4872 args.push_int(unicode_ch); 4873 4874 if (not_first_ch) { 4875 // public static boolean isJavaIdentifierPart(char ch); 4876 JavaCalls::call_static(&result, 4877 vmClasses::Character_klass(), 4878 vmSymbols::isJavaIdentifierPart_name(), 4879 vmSymbols::int_bool_signature(), 4880 &args, 4881 THREAD); 4882 } else { 4883 // public static boolean isJavaIdentifierStart(char ch); 4884 JavaCalls::call_static(&result, 4885 vmClasses::Character_klass(), 4886 vmSymbols::isJavaIdentifierStart_name(), 4887 vmSymbols::int_bool_signature(), 4888 &args, 4889 THREAD); 4890 } 4891 if (HAS_PENDING_EXCEPTION) { 4892 CLEAR_PENDING_EXCEPTION; 4893 return nullptr; 4894 } 4895 if(result.get_jboolean()) { 4896 continue; 4897 } 4898 } 4899 return (not_first_ch) ? old_p : nullptr; 4900 } 4901 return (not_first_ch && !last_is_slash) ? p : nullptr; 4902 } 4903 4904 // Take pointer to a UTF8 byte string (not NUL-terminated). 4905 // Skip over the longest part of the string that could 4906 // be taken as a field signature. Allow "void" if void_ok. 4907 // Return a pointer to just past the signature. 4908 // Return null if no legal signature is found. 4909 const char* ClassFileParser::skip_over_field_signature(const char* signature, 4910 bool void_ok, 4911 unsigned int length, 4912 TRAPS) const { 4913 unsigned int array_dim = 0; 4914 while (length > 0) { 4915 switch (signature[0]) { 4916 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; } 4917 case JVM_SIGNATURE_BOOLEAN: 4918 case JVM_SIGNATURE_BYTE: 4919 case JVM_SIGNATURE_CHAR: 4920 case JVM_SIGNATURE_SHORT: 4921 case JVM_SIGNATURE_INT: 4922 case JVM_SIGNATURE_FLOAT: 4923 case JVM_SIGNATURE_LONG: 4924 case JVM_SIGNATURE_DOUBLE: 4925 return signature + 1; 4926 case JVM_SIGNATURE_CLASS: 4927 { 4928 if (_major_version < JAVA_1_5_VERSION) { 4929 signature++; 4930 length--; 4931 // Skip over the class name if one is there 4932 const char* const p = skip_over_field_name(signature, true, length); 4933 assert(p == nullptr || p > signature, "must parse one character at least"); 4934 // The next character better be a semicolon 4935 if (p != nullptr && // Parse of field name succeeded. 4936 p - signature < static_cast<int>(length) && // There is at least one character left to parse. 4937 p[0] == JVM_SIGNATURE_ENDCLASS) { 4938 return p + 1; 4939 } 4940 } 4941 else { 4942 // Skip leading 'L' and ignore first appearance of ';' 4943 signature++; 4944 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); 4945 // Format check signature 4946 if (c != nullptr) { 4947 int newlen = pointer_delta_as_int(c, (char*) signature); 4948 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 4949 if (!legal) { 4950 classfile_parse_error("Class name is empty or contains illegal character " 4951 "in descriptor in class file %s", 4952 THREAD); 4953 return nullptr; 4954 } 4955 return signature + newlen + 1; 4956 } 4957 } 4958 return nullptr; 4959 } 4960 case JVM_SIGNATURE_ARRAY: 4961 array_dim++; 4962 if (array_dim > 255) { 4963 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4964 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD); 4965 return nullptr; 4966 } 4967 // The rest of what's there better be a legal signature 4968 signature++; 4969 length--; 4970 void_ok = false; 4971 break; 4972 default: 4973 return nullptr; 4974 } 4975 } 4976 return nullptr; 4977 } 4978 4979 // Checks if name is a legal class name. 4980 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 4981 if (!_need_verify) { return; } 4982 4983 assert(name->refcount() > 0, "symbol must be kept alive"); 4984 char* bytes = (char*)name->bytes(); 4985 unsigned int length = name->utf8_length(); 4986 bool legal = false; 4987 4988 if (length > 0) { 4989 const char* p; 4990 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4991 p = skip_over_field_signature(bytes, false, length, CHECK); 4992 legal = (p != nullptr) && ((p - bytes) == (int)length); 4993 } else if (_major_version < JAVA_1_5_VERSION) { 4994 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 4995 p = skip_over_field_name(bytes, true, length); 4996 legal = (p != nullptr) && ((p - bytes) == (int)length); 4997 } 4998 } else { 4999 // 4900761: relax the constraints based on JSR202 spec 5000 // Class names may be drawn from the entire Unicode character set. 5001 // Identifiers between '/' must be unqualified names. 5002 // The utf8 string has been verified when parsing cpool entries. 5003 legal = verify_unqualified_name(bytes, length, LegalClass); 5004 } 5005 } 5006 if (!legal) { 5007 ResourceMark rm(THREAD); 5008 assert(_class_name != nullptr, "invariant"); 5009 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5010 Exceptions::fthrow( 5011 THREAD_AND_LOCATION, 5012 vmSymbols::java_lang_ClassFormatError(), 5013 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5014 _class_name->as_C_string() 5015 ); 5016 return; 5017 } 5018 } 5019 5020 // Checks if name is a legal field name. 5021 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5022 if (!_need_verify) { return; } 5023 5024 char* bytes = (char*)name->bytes(); 5025 unsigned int length = name->utf8_length(); 5026 bool legal = false; 5027 5028 if (length > 0) { 5029 if (_major_version < JAVA_1_5_VERSION) { 5030 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5031 const char* p = skip_over_field_name(bytes, false, length); 5032 legal = (p != nullptr) && ((p - bytes) == (int)length); 5033 } 5034 } else { 5035 // 4881221: relax the constraints based on JSR202 spec 5036 legal = verify_unqualified_name(bytes, length, LegalField); 5037 } 5038 } 5039 5040 if (!legal) { 5041 ResourceMark rm(THREAD); 5042 assert(_class_name != nullptr, "invariant"); 5043 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5044 Exceptions::fthrow( 5045 THREAD_AND_LOCATION, 5046 vmSymbols::java_lang_ClassFormatError(), 5047 "Illegal field name \"%.*s\" in class %s", length, bytes, 5048 _class_name->as_C_string() 5049 ); 5050 return; 5051 } 5052 } 5053 5054 // Checks if name is a legal method name. 5055 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5056 if (!_need_verify) { return; } 5057 5058 assert(name != nullptr, "method name is null"); 5059 char* bytes = (char*)name->bytes(); 5060 unsigned int length = name->utf8_length(); 5061 bool legal = false; 5062 5063 if (length > 0) { 5064 if (bytes[0] == JVM_SIGNATURE_SPECIAL) { 5065 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5066 legal = true; 5067 } 5068 } else if (_major_version < JAVA_1_5_VERSION) { 5069 const char* p; 5070 p = skip_over_field_name(bytes, false, length); 5071 legal = (p != nullptr) && ((p - bytes) == (int)length); 5072 } else { 5073 // 4881221: relax the constraints based on JSR202 spec 5074 legal = verify_unqualified_name(bytes, length, LegalMethod); 5075 } 5076 } 5077 5078 if (!legal) { 5079 ResourceMark rm(THREAD); 5080 assert(_class_name != nullptr, "invariant"); 5081 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5082 Exceptions::fthrow( 5083 THREAD_AND_LOCATION, 5084 vmSymbols::java_lang_ClassFormatError(), 5085 "Illegal method name \"%.*s\" in class %s", length, bytes, 5086 _class_name->as_C_string() 5087 ); 5088 return; 5089 } 5090 } 5091 5092 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const { 5093 const char* const bytes = (const char*)signature->bytes(); 5094 const unsigned int length = signature->utf8_length(); 5095 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false); 5096 5097 if (p == nullptr || (p - bytes) != (int)length) { 5098 return false; 5099 } 5100 return true; 5101 } 5102 5103 // Checks if signature is a legal field signature. 5104 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5105 const Symbol* signature, 5106 TRAPS) const { 5107 if (!_need_verify) { return; } 5108 5109 if (!legal_field_signature(signature, THREAD)) { 5110 CLEAR_PENDING_EXCEPTION; // throw this exception instead 5111 throwIllegalSignature("Field", name, signature, CHECK); 5112 } 5113 } 5114 5115 // Check that the signature is compatible with the method name. For example, 5116 // check that <init> has a void signature. 5117 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name, 5118 const Symbol* signature, 5119 TRAPS) const { 5120 if (!_need_verify) { 5121 return; 5122 } 5123 5124 // Class initializers cannot have args for class format version >= 51. 5125 if (name == vmSymbols::class_initializer_name() && 5126 signature != vmSymbols::void_method_signature() && 5127 _major_version >= JAVA_7_VERSION) { 5128 throwIllegalSignature("Method", name, signature, THREAD); 5129 return; 5130 } 5131 5132 int sig_length = signature->utf8_length(); 5133 if (name->utf8_length() > 0 && 5134 name->char_at(0) == JVM_SIGNATURE_SPECIAL && 5135 sig_length > 0 && 5136 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) { 5137 throwIllegalSignature("Method", name, signature, THREAD); 5138 } 5139 } 5140 5141 // Checks if signature is a legal method signature. 5142 // Returns number of parameters 5143 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5144 const Symbol* signature, 5145 TRAPS) const { 5146 if (!_need_verify) { 5147 // make sure caller's args_size will be less than 0 even for non-static 5148 // method so it will be recomputed in compute_size_of_parameters(). 5149 return -2; 5150 } 5151 5152 unsigned int args_size = 0; 5153 const char* p = (const char*)signature->bytes(); 5154 unsigned int length = signature->utf8_length(); 5155 const char* nextp; 5156 5157 // The first character must be a '(' 5158 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5159 length--; 5160 // Skip over legal field signatures 5161 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5162 while ((length > 0) && (nextp != nullptr)) { 5163 args_size++; 5164 if (p[0] == 'J' || p[0] == 'D') { 5165 args_size++; 5166 } 5167 length -= pointer_delta_as_int(nextp, p); 5168 p = nextp; 5169 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5170 } 5171 // The first non-signature thing better be a ')' 5172 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5173 length--; 5174 // Now we better just have a return value 5175 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5176 if (nextp && ((int)length == (nextp - p))) { 5177 return args_size; 5178 } 5179 } 5180 } 5181 // Report error 5182 throwIllegalSignature("Method", name, signature, THREAD); 5183 return 0; 5184 } 5185 5186 int ClassFileParser::static_field_size() const { 5187 assert(_layout_info != nullptr, "invariant"); 5188 return _layout_info->_static_field_size; 5189 } 5190 5191 int ClassFileParser::total_oop_map_count() const { 5192 assert(_layout_info != nullptr, "invariant"); 5193 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count; 5194 } 5195 5196 jint ClassFileParser::layout_size() const { 5197 assert(_layout_info != nullptr, "invariant"); 5198 return _layout_info->_instance_size; 5199 } 5200 5201 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5202 const Array<Method*>* methods) { 5203 assert(ik != nullptr, "invariant"); 5204 assert(methods != nullptr, "invariant"); 5205 5206 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5207 // (We used to do this lazily, but now we query it in Rewriter, 5208 // which is eagerly done for every method, so we might as well do it now, 5209 // when everything is fresh in memory.) 5210 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik); 5211 5212 if (klass_id != vmSymbolID::NO_SID) { 5213 for (int j = 0; j < methods->length(); ++j) { 5214 Method* method = methods->at(j); 5215 method->init_intrinsic_id(klass_id); 5216 5217 if (CheckIntrinsics) { 5218 // Check if an intrinsic is defined for method 'method', 5219 // but the method is not annotated with @IntrinsicCandidate. 5220 if (method->intrinsic_id() != vmIntrinsics::_none && 5221 !method->intrinsic_candidate()) { 5222 tty->print("Compiler intrinsic is defined for method [%s], " 5223 "but the method is not annotated with @IntrinsicCandidate.%s", 5224 method->name_and_sig_as_C_string(), 5225 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5226 ); 5227 tty->cr(); 5228 DEBUG_ONLY(vm_exit(1)); 5229 } 5230 // Check is the method 'method' is annotated with @IntrinsicCandidate, 5231 // but there is no intrinsic available for it. 5232 if (method->intrinsic_candidate() && 5233 method->intrinsic_id() == vmIntrinsics::_none) { 5234 tty->print("Method [%s] is annotated with @IntrinsicCandidate, " 5235 "but no compiler intrinsic is defined for the method.%s", 5236 method->name_and_sig_as_C_string(), 5237 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5238 ); 5239 tty->cr(); 5240 DEBUG_ONLY(vm_exit(1)); 5241 } 5242 } 5243 } // end for 5244 5245 #ifdef ASSERT 5246 if (CheckIntrinsics) { 5247 // Check for orphan methods in the current class. A method m 5248 // of a class C is orphan if an intrinsic is defined for method m, 5249 // but class C does not declare m. 5250 // The check is potentially expensive, therefore it is available 5251 // only in debug builds. 5252 5253 for (auto id : EnumRange<vmIntrinsicID>{}) { 5254 if (vmIntrinsics::_compiledLambdaForm == id) { 5255 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5256 // generated for the JVM from a LambdaForm and therefore no method 5257 // is defined for it. 5258 continue; 5259 } 5260 if (vmIntrinsics::_blackhole == id) { 5261 // The _blackhole intrinsic is a special marker. No explicit method 5262 // is defined for it. 5263 continue; 5264 } 5265 5266 if (vmIntrinsics::class_for(id) == klass_id) { 5267 // Check if the current class contains a method with the same 5268 // name, flags, signature. 5269 bool match = false; 5270 for (int j = 0; j < methods->length(); ++j) { 5271 const Method* method = methods->at(j); 5272 if (method->intrinsic_id() == id) { 5273 match = true; 5274 break; 5275 } 5276 } 5277 5278 if (!match) { 5279 char buf[1000]; 5280 tty->print("Compiler intrinsic is defined for method [%s], " 5281 "but the method is not available in class [%s].%s", 5282 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)), 5283 ik->name()->as_C_string(), 5284 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5285 ); 5286 tty->cr(); 5287 DEBUG_ONLY(vm_exit(1)); 5288 } 5289 } 5290 } // end for 5291 } // CheckIntrinsics 5292 #endif // ASSERT 5293 } 5294 } 5295 5296 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, 5297 const ClassInstanceInfo& cl_inst_info, 5298 TRAPS) { 5299 if (_klass != nullptr) { 5300 return _klass; 5301 } 5302 5303 InstanceKlass* const ik = 5304 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5305 5306 if (is_hidden()) { 5307 mangle_hidden_class_name(ik); 5308 } 5309 5310 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL); 5311 5312 assert(_klass == ik, "invariant"); 5313 return ik; 5314 } 5315 5316 void ClassFileParser::create_acmp_maps(InstanceKlass* ik, TRAPS) { 5317 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset); 5318 // Current format of acmp maps: 5319 // All maps are stored contiguously in a single int array because it might 5320 // be too early to instantiate an Object array (to be investigated) 5321 // Format is: 5322 // [number_of_nonoop_entries][offset0][size0][offset1][size1]...[oop_offset0][oop_offset1]... 5323 // ^ ^ 5324 // | | 5325 // --------------------- Pair of integer describing a segment of 5326 // contiguous non-oop fields 5327 // First element is the number of segment of contiguous non-oop fields 5328 // Then, each segment of contiguous non-oop fields is described by two consecutive elements: 5329 // the offset then the size. 5330 // After the last segment of contiguous non-oop fields, oop fields are described, one element 5331 // per oop field, containing the offset of the field. 5332 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2; 5333 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length(); 5334 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1; 5335 5336 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK); 5337 typeArrayHandle map_h(THREAD, map); 5338 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK); 5339 5340 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length()); 5341 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length()); 5342 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) { 5343 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset); 5344 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size); 5345 5346 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data. 5347 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset); 5348 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size); 5349 } 5350 int oop_map_start = nonoop_acmp_map_size + 1; 5351 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) { 5352 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i)); 5353 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i)); 5354 } 5355 assert(acmp_maps_array->length() == map_h->length(), "sanity"); 5356 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h()); 5357 ik->set_acmp_maps_array(acmp_maps_array); 5358 } 5359 5360 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, 5361 bool changed_by_loadhook, 5362 const ClassInstanceInfo& cl_inst_info, 5363 TRAPS) { 5364 assert(ik != nullptr, "invariant"); 5365 5366 // Set name and CLD before adding to CLD 5367 ik->set_class_loader_data(_loader_data); 5368 ik->set_class_loader_type(); 5369 ik->set_name(_class_name); 5370 5371 // Add all classes to our internal class loader list here, 5372 // including classes in the bootstrap (null) class loader. 5373 const bool publicize = !is_internal(); 5374 5375 _loader_data->add_class(ik, publicize); 5376 5377 set_klass_to_deallocate(ik); 5378 5379 assert(_layout_info != nullptr, "invariant"); 5380 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity"); 5381 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count, 5382 "sanity"); 5383 5384 assert(ik->is_instance_klass(), "sanity"); 5385 assert(ik->size_helper() == _layout_info->_instance_size, "sanity"); 5386 5387 // Fill in information already parsed 5388 ik->set_should_verify_class(_need_verify); 5389 5390 // Not yet: supers are done below to support the new subtype-checking fields 5391 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size); 5392 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields); 5393 ik->set_has_strict_static_fields(_has_strict_static_fields); 5394 5395 if (_layout_info->_is_naturally_atomic) { 5396 ik->set_is_naturally_atomic(); 5397 } 5398 5399 if (_layout_info->_must_be_atomic) { 5400 ik->set_must_be_atomic(); 5401 } 5402 5403 ik->set_static_oop_field_count(_static_oop_count); 5404 5405 // this transfers ownership of a lot of arrays from 5406 // the parser onto the InstanceKlass* 5407 apply_parsed_class_metadata(ik, _java_fields_count); 5408 5409 // can only set dynamic nest-host after static nest information is set 5410 if (cl_inst_info.dynamic_nest_host() != nullptr) { 5411 ik->set_nest_host(cl_inst_info.dynamic_nest_host()); 5412 } 5413 5414 // note that is not safe to use the fields in the parser from this point on 5415 assert(nullptr == _cp, "invariant"); 5416 assert(nullptr == _fieldinfo_stream, "invariant"); 5417 assert(nullptr == _fieldinfo_search_table, "invariant"); 5418 assert(nullptr == _fields_status, "invariant"); 5419 assert(nullptr == _methods, "invariant"); 5420 assert(nullptr == _inner_classes, "invariant"); 5421 assert(nullptr == _nest_members, "invariant"); 5422 assert(nullptr == _loadable_descriptors, "invariant"); 5423 assert(nullptr == _combined_annotations, "invariant"); 5424 assert(nullptr == _record_components, "invariant"); 5425 assert(nullptr == _permitted_subclasses, "invariant"); 5426 assert(nullptr == _inline_layout_info_array, "invariant"); 5427 5428 if (_has_localvariable_table) { 5429 ik->set_has_localvariable_table(true); 5430 } 5431 5432 if (_has_final_method) { 5433 ik->set_has_final_method(); 5434 } 5435 5436 ik->copy_method_ordering(_method_ordering, CHECK); 5437 // The InstanceKlass::_methods_jmethod_ids cache 5438 // is managed on the assumption that the initial cache 5439 // size is equal to the number of methods in the class. If 5440 // that changes, then InstanceKlass::idnum_can_increment() 5441 // has to be changed accordingly. 5442 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length())); 5443 5444 ik->set_this_class_index(_this_class_index); 5445 5446 if (_is_hidden) { 5447 // _this_class_index is a CONSTANT_Class entry that refers to this 5448 // hidden class itself. If this class needs to refer to its own methods 5449 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference 5450 // _this_class_index. However, because this class is hidden (it's 5451 // not stored in SystemDictionary), _this_class_index cannot be resolved 5452 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5453 // Therefore, we must eagerly resolve _this_class_index now. 5454 ik->constants()->klass_at_put(_this_class_index, ik); 5455 } 5456 5457 ik->set_minor_version(_minor_version); 5458 ik->set_major_version(_major_version); 5459 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5460 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5461 5462 assert(!_is_hidden || ik->is_hidden(), "must be set already"); 5463 5464 // Set PackageEntry for this_klass 5465 oop cl = ik->class_loader(); 5466 Handle clh = Handle(THREAD, cl); 5467 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5468 ik->set_package(cld, nullptr, CHECK); 5469 5470 const Array<Method*>* const methods = ik->methods(); 5471 assert(methods != nullptr, "invariant"); 5472 const int methods_len = methods->length(); 5473 5474 check_methods_for_intrinsics(ik, methods); 5475 5476 // Fill in field values obtained by parse_classfile_attributes 5477 if (_parsed_annotations->has_any_annotations()) 5478 _parsed_annotations->apply_to(ik); 5479 5480 apply_parsed_class_attributes(ik); 5481 5482 // Miranda methods 5483 if ((_num_miranda_methods > 0) || 5484 // if this class introduced new miranda methods or 5485 (_super_klass != nullptr && _super_klass->has_miranda_methods()) 5486 // super class exists and this class inherited miranda methods 5487 ) { 5488 ik->set_has_miranda_methods(); // then set a flag 5489 } 5490 5491 // Fill in information needed to compute superclasses. 5492 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5493 ik->set_transitive_interfaces(_transitive_interfaces); 5494 ik->set_local_interfaces(_local_interfaces); 5495 _transitive_interfaces = nullptr; 5496 _local_interfaces = nullptr; 5497 5498 // Initialize itable offset tables 5499 klassItable::setup_itable_offset_table(ik); 5500 5501 // Compute transitive closure of interfaces this class implements 5502 // Do final class setup 5503 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks; 5504 if (oop_map_blocks->_nonstatic_oop_map_count > 0) { 5505 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); 5506 } 5507 5508 if (_has_contended_fields || _parsed_annotations->is_contended() || 5509 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) { 5510 ik->set_has_contended_annotations(true); 5511 } 5512 5513 // Fill in has_finalizer and layout_helper 5514 set_precomputed_flags(ik); 5515 5516 // check if this class can access its super class 5517 check_super_class_access(ik, CHECK); 5518 5519 // check if this class can access its superinterfaces 5520 check_super_interface_access(ik, CHECK); 5521 5522 // check if this class overrides any final method 5523 check_final_method_override(ik, CHECK); 5524 5525 // reject static interface methods prior to Java 8 5526 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5527 check_illegal_static_method(ik, CHECK); 5528 } 5529 5530 // Obtain this_klass' module entry 5531 ModuleEntry* module_entry = ik->module(); 5532 assert(module_entry != nullptr, "module_entry should always be set"); 5533 5534 // Obtain java.lang.Module 5535 Handle module_handle(THREAD, module_entry->module_oop()); 5536 5537 // Allocate mirror and initialize static fields 5538 java_lang_Class::create_mirror(ik, 5539 Handle(THREAD, _loader_data->class_loader()), 5540 module_handle, 5541 _protection_domain, 5542 cl_inst_info.class_data(), 5543 CHECK); 5544 5545 assert(_all_mirandas != nullptr, "invariant"); 5546 5547 // Generate any default methods - default methods are public interface methods 5548 // that have a default implementation. This is new with Java 8. 5549 if (_has_nonstatic_concrete_methods) { 5550 DefaultMethods::generate_default_methods(ik, 5551 _all_mirandas, 5552 CHECK); 5553 } 5554 5555 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5556 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5557 !module_entry->has_default_read_edges()) { 5558 if (!module_entry->set_has_default_read_edges()) { 5559 // We won a potential race 5560 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5561 } 5562 } 5563 5564 if (is_inline_type()) { 5565 InlineKlass* vk = InlineKlass::cast(ik); 5566 vk->set_payload_alignment(_layout_info->_payload_alignment); 5567 vk->set_payload_offset(_layout_info->_payload_offset); 5568 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes); 5569 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes); 5570 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment); 5571 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes); 5572 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes); 5573 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes); 5574 vk->set_null_marker_offset(_layout_info->_null_marker_offset); 5575 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset); 5576 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type(); 5577 vk->initialize_calling_convention(CHECK); 5578 } 5579 5580 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface() 5581 && _class_name != vmSymbols::java_lang_Object()) { 5582 // Both abstract and concrete value classes need a field map for acmp 5583 create_acmp_maps(ik, CHECK); 5584 } 5585 5586 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5587 5588 if (!is_internal()) { 5589 ik->print_class_load_logging(_loader_data, module_entry, _stream); 5590 5591 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5592 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && 5593 log_is_enabled(Info, class, preview)) { 5594 ResourceMark rm; 5595 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5596 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); 5597 } 5598 5599 if (log_is_enabled(Debug, class, resolve)) { 5600 ResourceMark rm; 5601 // print out the superclass. 5602 const char * from = ik->external_name(); 5603 if (ik->super() != nullptr) { 5604 log_debug(class, resolve)("%s %s (super)", 5605 from, 5606 ik->super()->external_name()); 5607 } 5608 // print out each of the interface classes referred to by this class. 5609 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5610 if (local_interfaces != nullptr) { 5611 const int length = local_interfaces->length(); 5612 for (int i = 0; i < length; i++) { 5613 const InstanceKlass* const k = local_interfaces->at(i); 5614 const char * to = k->external_name(); 5615 log_debug(class, resolve)("%s %s (interface)", from, to); 5616 } 5617 } 5618 } 5619 } 5620 5621 // If we reach here, all is well. 5622 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5623 // in order for it to not be destroyed in the ClassFileParser destructor. 5624 set_klass_to_deallocate(nullptr); 5625 5626 // it's official 5627 set_klass(ik); 5628 5629 DEBUG_ONLY(ik->verify();) 5630 } 5631 5632 void ClassFileParser::update_class_name(Symbol* new_class_name) { 5633 // Decrement the refcount in the old name, since we're clobbering it. 5634 _class_name->decrement_refcount(); 5635 5636 _class_name = new_class_name; 5637 // Increment the refcount of the new name. 5638 // Now the ClassFileParser owns this name and will decrement in 5639 // the destructor. 5640 _class_name->increment_refcount(); 5641 } 5642 5643 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5644 Symbol* name, 5645 ClassLoaderData* loader_data, 5646 const ClassLoadInfo* cl_info, 5647 Publicity pub_level, 5648 TRAPS) : 5649 _stream(stream), 5650 _class_name(nullptr), 5651 _loader_data(loader_data), 5652 _is_hidden(cl_info->is_hidden()), 5653 _can_access_vm_annotations(cl_info->can_access_vm_annotations()), 5654 _orig_cp_size(0), 5655 _static_oop_count(0), 5656 _super_klass(), 5657 _cp(nullptr), 5658 _fieldinfo_stream(nullptr), 5659 _fieldinfo_search_table(nullptr), 5660 _fields_status(nullptr), 5661 _methods(nullptr), 5662 _inner_classes(nullptr), 5663 _nest_members(nullptr), 5664 _nest_host(0), 5665 _permitted_subclasses(nullptr), 5666 _loadable_descriptors(nullptr), 5667 _record_components(nullptr), 5668 _local_interfaces(nullptr), 5669 _transitive_interfaces(nullptr), 5670 _combined_annotations(nullptr), 5671 _class_annotations(nullptr), 5672 _class_type_annotations(nullptr), 5673 _fields_annotations(nullptr), 5674 _fields_type_annotations(nullptr), 5675 _klass(nullptr), 5676 _klass_to_deallocate(nullptr), 5677 _parsed_annotations(nullptr), 5678 _layout_info(nullptr), 5679 _inline_layout_info_array(nullptr), 5680 _temp_field_info(nullptr), 5681 _method_ordering(nullptr), 5682 _all_mirandas(nullptr), 5683 _vtable_size(0), 5684 _itable_size(0), 5685 _num_miranda_methods(0), 5686 _protection_domain(cl_info->protection_domain()), 5687 _access_flags(), 5688 _pub_level(pub_level), 5689 _bad_constant_seen(0), 5690 _synthetic_flag(false), 5691 _sde_length(false), 5692 _sde_buffer(nullptr), 5693 _sourcefile_index(0), 5694 _generic_signature_index(0), 5695 _major_version(0), 5696 _minor_version(0), 5697 _this_class_index(0), 5698 _super_class_index(0), 5699 _itfs_len(0), 5700 _java_fields_count(0), 5701 _need_verify(false), 5702 _has_nonstatic_concrete_methods(false), 5703 _declares_nonstatic_concrete_methods(false), 5704 _has_localvariable_table(false), 5705 _has_final_method(false), 5706 _has_contended_fields(false), 5707 _has_aot_runtime_setup_method(false), 5708 _has_strict_static_fields(false), 5709 _is_naturally_atomic(false), 5710 _must_be_atomic(true), 5711 _has_loosely_consistent_annotation(false), 5712 _has_finalizer(false), 5713 _has_empty_finalizer(false), 5714 _max_bootstrap_specifier_index(-1) { 5715 5716 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name(); 5717 _class_name->increment_refcount(); 5718 5719 assert(_loader_data != nullptr, "invariant"); 5720 assert(stream != nullptr, "invariant"); 5721 assert(_stream != nullptr, "invariant"); 5722 assert(_stream->buffer() == _stream->current(), "invariant"); 5723 assert(_class_name != nullptr, "invariant"); 5724 assert(0 == _access_flags.as_unsigned_short(), "invariant"); 5725 5726 // Figure out whether we can skip format checking (matching classic VM behavior) 5727 // Always verify CFLH bytes from the user agents. 5728 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader()); 5729 5730 // synch back verification state to stream to check for truncation. 5731 stream->set_need_verify(_need_verify); 5732 5733 parse_stream(stream, CHECK); 5734 5735 post_process_parsed_stream(stream, _cp, CHECK); 5736 } 5737 5738 void ClassFileParser::clear_class_metadata() { 5739 // metadata created before the instance klass is created. Must be 5740 // deallocated if classfile parsing returns an error. 5741 _cp = nullptr; 5742 _fieldinfo_stream = nullptr; 5743 _fieldinfo_search_table = nullptr; 5744 _fields_status = nullptr; 5745 _methods = nullptr; 5746 _inner_classes = nullptr; 5747 _nest_members = nullptr; 5748 _permitted_subclasses = nullptr; 5749 _loadable_descriptors = nullptr; 5750 _combined_annotations = nullptr; 5751 _class_annotations = _class_type_annotations = nullptr; 5752 _fields_annotations = _fields_type_annotations = nullptr; 5753 _record_components = nullptr; 5754 _inline_layout_info_array = nullptr; 5755 } 5756 5757 // Destructor to clean up 5758 ClassFileParser::~ClassFileParser() { 5759 _class_name->decrement_refcount(); 5760 5761 if (_cp != nullptr) { 5762 MetadataFactory::free_metadata(_loader_data, _cp); 5763 } 5764 5765 if (_fieldinfo_stream != nullptr) { 5766 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream); 5767 } 5768 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table); 5769 5770 if (_fields_status != nullptr) { 5771 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status); 5772 } 5773 5774 if (_inline_layout_info_array != nullptr) { 5775 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array); 5776 } 5777 5778 if (_methods != nullptr) { 5779 // Free methods 5780 InstanceKlass::deallocate_methods(_loader_data, _methods); 5781 } 5782 5783 // beware of the Universe::empty_blah_array!! 5784 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) { 5785 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 5786 } 5787 5788 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) { 5789 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 5790 } 5791 5792 if (_record_components != nullptr) { 5793 InstanceKlass::deallocate_record_components(_loader_data, _record_components); 5794 } 5795 5796 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) { 5797 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses); 5798 } 5799 5800 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) { 5801 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors); 5802 } 5803 5804 // Free interfaces 5805 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 5806 _local_interfaces, _transitive_interfaces); 5807 5808 if (_combined_annotations != nullptr) { 5809 // After all annotations arrays have been created, they are installed into the 5810 // Annotations object that will be assigned to the InstanceKlass being created. 5811 5812 // Deallocate the Annotations object and the installed annotations arrays. 5813 _combined_annotations->deallocate_contents(_loader_data); 5814 5815 // If the _combined_annotations pointer is non-null, 5816 // then the other annotations fields should have been cleared. 5817 assert(_class_annotations == nullptr, "Should have been cleared"); 5818 assert(_class_type_annotations == nullptr, "Should have been cleared"); 5819 assert(_fields_annotations == nullptr, "Should have been cleared"); 5820 assert(_fields_type_annotations == nullptr, "Should have been cleared"); 5821 } else { 5822 // If the annotations arrays were not installed into the Annotations object, 5823 // then they have to be deallocated explicitly. 5824 MetadataFactory::free_array<u1>(_loader_data, _class_annotations); 5825 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations); 5826 Annotations::free_contents(_loader_data, _fields_annotations); 5827 Annotations::free_contents(_loader_data, _fields_type_annotations); 5828 } 5829 5830 clear_class_metadata(); 5831 _transitive_interfaces = nullptr; 5832 _local_interfaces = nullptr; 5833 5834 // deallocate the klass if already created. Don't directly deallocate, but add 5835 // to the deallocate list so that the klass is removed from the CLD::_klasses list 5836 // at a safepoint. 5837 if (_klass_to_deallocate != nullptr) { 5838 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 5839 } 5840 } 5841 5842 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 5843 TRAPS) { 5844 5845 assert(stream != nullptr, "invariant"); 5846 assert(_class_name != nullptr, "invariant"); 5847 5848 // BEGIN STREAM PARSING 5849 stream->guarantee_more(8, CHECK); // magic, major, minor 5850 // Magic value 5851 const u4 magic = stream->get_u4_fast(); 5852 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 5853 "Incompatible magic value %u in class file %s", 5854 magic, CHECK); 5855 5856 // Version numbers 5857 _minor_version = stream->get_u2_fast(); 5858 _major_version = stream->get_u2_fast(); 5859 5860 // Check version numbers - we check this even with verifier off 5861 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 5862 5863 stream->guarantee_more(3, CHECK); // length, first cp tag 5864 u2 cp_size = stream->get_u2_fast(); 5865 5866 guarantee_property( 5867 cp_size >= 1, "Illegal constant pool size %u in class file %s", 5868 cp_size, CHECK); 5869 5870 _orig_cp_size = cp_size; 5871 if (is_hidden()) { // Add a slot for hidden class name. 5872 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK); 5873 cp_size++; 5874 } 5875 5876 _cp = ConstantPool::allocate(_loader_data, 5877 cp_size, 5878 CHECK); 5879 5880 ConstantPool* const cp = _cp; 5881 5882 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 5883 5884 assert(cp_size == (u2)cp->length(), "invariant"); 5885 5886 // ACCESS FLAGS 5887 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 5888 5889 // Access flags 5890 u2 flags; 5891 // JVM_ACC_MODULE is defined in JDK-9 and later. 5892 if (_major_version >= JAVA_9_VERSION) { 5893 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 5894 } else { 5895 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 5896 } 5897 5898 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 5899 // Set abstract bit for old class files for backward compatibility 5900 flags |= JVM_ACC_ABSTRACT; 5901 } 5902 5903 // Fixing ACC_SUPER/ACC_IDENTITY for old class files 5904 if (!supports_inline_types()) { 5905 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 5906 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 5907 if (!is_module && !is_interface) { 5908 flags |= JVM_ACC_IDENTITY; 5909 } 5910 } 5911 5912 verify_legal_class_modifiers(flags, nullptr, false, CHECK); 5913 5914 short bad_constant = class_bad_constant_seen(); 5915 if (bad_constant != 0) { 5916 // Do not throw CFE until after the access_flags are checked because if 5917 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 5918 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD); 5919 return; 5920 } 5921 5922 _access_flags.set_flags(flags); 5923 5924 // This class and superclass 5925 _this_class_index = stream->get_u2_fast(); 5926 guarantee_property( 5927 valid_cp_range(_this_class_index, cp_size) && 5928 cp->tag_at(_this_class_index).is_unresolved_klass(), 5929 "Invalid this class index %u in constant pool in class file %s", 5930 _this_class_index, CHECK); 5931 5932 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 5933 assert(class_name_in_cp != nullptr, "class_name can't be null"); 5934 5935 // Don't need to check whether this class name is legal or not. 5936 // It has been checked when constant pool is parsed. 5937 // However, make sure it is not an array type. 5938 if (_need_verify) { 5939 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY, 5940 "Bad class name in class file %s", 5941 CHECK); 5942 } 5943 5944 #ifdef ASSERT 5945 // Basic sanity checks 5946 if (_is_hidden) { 5947 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name"); 5948 } 5949 #endif 5950 5951 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class. 5952 5953 if (_is_hidden) { 5954 assert(_class_name != nullptr, "Unexpected null _class_name"); 5955 #ifdef ASSERT 5956 if (_need_verify) { 5957 verify_legal_class_name(_class_name, CHECK); 5958 } 5959 #endif 5960 5961 } else { 5962 // Check if name in class file matches given name 5963 if (_class_name != class_name_in_cp) { 5964 if (_class_name != vmSymbols::unknown_class_name()) { 5965 ResourceMark rm(THREAD); 5966 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5967 Exceptions::fthrow(THREAD_AND_LOCATION, 5968 vmSymbols::java_lang_NoClassDefFoundError(), 5969 "%s (wrong name: %s)", 5970 _class_name->as_C_string(), 5971 class_name_in_cp->as_C_string() 5972 ); 5973 return; 5974 } else { 5975 // The class name was not known by the caller so we set it from 5976 // the value in the CP. 5977 update_class_name(class_name_in_cp); 5978 } 5979 // else nothing to do: the expected class name matches what is in the CP 5980 } 5981 } 5982 5983 // Verification prevents us from creating names with dots in them, this 5984 // asserts that that's the case. 5985 assert(is_internal_format(_class_name), "external class name format used internally"); 5986 5987 if (!is_internal()) { 5988 LogTarget(Debug, class, preorder) lt; 5989 if (lt.is_enabled()){ 5990 ResourceMark rm(THREAD); 5991 LogStream ls(lt); 5992 ls.print("%s", _class_name->as_klass_external_name()); 5993 if (stream->source() != nullptr) { 5994 ls.print(" source: %s", stream->source()); 5995 } 5996 ls.cr(); 5997 } 5998 } 5999 6000 // SUPERKLASS 6001 _super_class_index = stream->get_u2_fast(); 6002 check_super_class(cp, 6003 _super_class_index, 6004 _need_verify, 6005 CHECK); 6006 6007 // Interfaces 6008 _itfs_len = stream->get_u2_fast(); 6009 parse_interfaces(stream, 6010 _itfs_len, 6011 cp, 6012 &_has_nonstatic_concrete_methods, 6013 CHECK); 6014 6015 assert(_local_interfaces != nullptr, "invariant"); 6016 6017 // Fields (offsets are filled in later) 6018 parse_fields(stream, 6019 _access_flags, 6020 cp, 6021 cp_size, 6022 &_java_fields_count, 6023 CHECK); 6024 6025 assert(_temp_field_info != nullptr, "invariant"); 6026 6027 // Methods 6028 parse_methods(stream, 6029 _access_flags.is_interface(), 6030 &_has_localvariable_table, 6031 &_has_final_method, 6032 &_declares_nonstatic_concrete_methods, 6033 CHECK); 6034 6035 assert(_methods != nullptr, "invariant"); 6036 6037 if (_declares_nonstatic_concrete_methods) { 6038 _has_nonstatic_concrete_methods = true; 6039 } 6040 6041 // Additional attributes/annotations 6042 _parsed_annotations = new ClassAnnotationCollector(); 6043 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6044 6045 assert(_inner_classes != nullptr, "invariant"); 6046 6047 // Finalize the Annotations metadata object, 6048 // now that all annotation arrays have been created. 6049 create_combined_annotations(CHECK); 6050 6051 // Make sure this is the end of class file stream 6052 guarantee_property(stream->at_eos(), 6053 "Extra bytes at the end of class file %s", 6054 CHECK); 6055 6056 // all bytes in stream read and parsed 6057 } 6058 6059 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) { 6060 ResourceMark rm; 6061 // Construct hidden name from _class_name, "+", and &ik. Note that we can't 6062 // use a '/' because that confuses finding the class's package. Also, can't 6063 // use an illegal char such as ';' because that causes serialization issues 6064 // and issues with hidden classes that create their own hidden classes. 6065 char addr_buf[20]; 6066 if (CDSConfig::is_dumping_static_archive()) { 6067 // We want stable names for the archived hidden classes (only for static 6068 // archive for now). Spaces under default_SharedBaseAddress() will be 6069 // occupied by the archive at run time, so we know that no dynamically 6070 // loaded InstanceKlass will be placed under there. 6071 static volatile size_t counter = 0; 6072 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it 6073 size_t new_id = AtomicAccess::add(&counter, (size_t)1); 6074 jio_snprintf(addr_buf, 20, "0x%zx", new_id); 6075 } else { 6076 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik)); 6077 } 6078 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf); 6079 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len); 6080 jio_snprintf(new_name, new_name_len, "%s+%s", 6081 _class_name->as_C_string(), addr_buf); 6082 update_class_name(SymbolTable::new_symbol(new_name)); 6083 6084 // Add a Utf8 entry containing the hidden name. 6085 assert(_class_name != nullptr, "Unexpected null _class_name"); 6086 int hidden_index = _orig_cp_size; // this is an extra slot we added 6087 _cp->symbol_at_put(hidden_index, _class_name); 6088 6089 // Update this_class_index's slot in the constant pool with the new Utf8 entry. 6090 // We have to update the resolved_klass_index and the name_index together 6091 // so extract the existing resolved_klass_index first. 6092 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index); 6093 int resolved_klass_index = cp_klass_slot.resolved_klass_index(); 6094 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index); 6095 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size, 6096 "Bad name_index"); 6097 } 6098 6099 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6100 ConstantPool* cp, 6101 TRAPS) { 6102 assert(stream != nullptr, "invariant"); 6103 assert(stream->at_eos(), "invariant"); 6104 assert(cp != nullptr, "invariant"); 6105 assert(_loader_data != nullptr, "invariant"); 6106 6107 if (_class_name == vmSymbols::java_lang_Object()) { 6108 precond(_super_class_index == 0); 6109 precond(_super_klass == nullptr); 6110 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6111 "java.lang.Object cannot implement an interface in class file %s", 6112 CHECK); 6113 } else { 6114 // Set _super_klass after class file is parsed and format is checked 6115 assert(_super_class_index > 0, "any class other than Object must have a super class"); 6116 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6117 if (_access_flags.is_interface()) { 6118 // Before attempting to resolve the superclass, check for class format 6119 // errors not checked yet. 6120 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6121 "Interfaces must have java.lang.Object as superclass in class file %s", 6122 CHECK); 6123 } 6124 Handle loader(THREAD, _loader_data->class_loader()); 6125 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) { 6126 // fast path to avoid lookup 6127 _super_klass = vmClasses::Object_klass(); 6128 } else { 6129 _super_klass = (const InstanceKlass*) 6130 SystemDictionary::resolve_super_or_fail(_class_name, 6131 super_class_name, 6132 loader, 6133 true, 6134 CHECK); 6135 } 6136 } 6137 6138 if (_super_klass != nullptr) { 6139 if (_super_klass->is_interface()) { 6140 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD); 6141 return; 6142 } 6143 6144 if (_super_klass->is_final()) { 6145 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD); 6146 return; 6147 } 6148 6149 if (Arguments::is_valhalla_enabled()) { 6150 // If this class is an value class, its super class cannot be an identity class unless it is java.lang.Object. 6151 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() && 6152 _super_klass != vmClasses::Object_klass()) { 6153 ResourceMark rm(THREAD); 6154 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 6155 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string())); 6156 } 6157 } 6158 6159 if (_super_klass->has_nonstatic_concrete_methods()) { 6160 _has_nonstatic_concrete_methods = true; 6161 } 6162 } 6163 6164 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) { 6165 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 6166 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class", 6167 _class_name->as_klass_external_name())); 6168 } 6169 6170 // Determining if the class allows tearing or not (default is not) 6171 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) { 6172 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue) 6173 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) { 6174 // Conditions above are not sufficient to determine atomicity requirements, 6175 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too 6176 // Marking as not needing atomicity for now, can be updated when computing the fields layout 6177 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by 6178 // the FieldLayoutBuilder, not with this _must_be_atomic field. 6179 _must_be_atomic = false; 6180 } 6181 // Apply VM options override 6182 if (*ForceNonTearable != '\0') { 6183 // Allow a command line switch to force the same atomicity property: 6184 const char* class_name_str = _class_name->as_C_string(); 6185 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) { 6186 _must_be_atomic = true; 6187 } 6188 } 6189 } 6190 6191 // Compute the transitive list of all unique interfaces implemented by this class 6192 _transitive_interfaces = 6193 compute_transitive_interfaces(_super_klass, 6194 _local_interfaces, 6195 _loader_data, 6196 CHECK); 6197 6198 assert(_transitive_interfaces != nullptr, "invariant"); 6199 6200 // sort methods 6201 _method_ordering = sort_methods(_methods); 6202 6203 _all_mirandas = new GrowableArray<Method*>(20); 6204 6205 Handle loader(THREAD, _loader_data->class_loader()); 6206 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6207 &_num_miranda_methods, 6208 _all_mirandas, 6209 _super_klass, 6210 _methods, 6211 _access_flags, 6212 _major_version, 6213 loader, 6214 _class_name, 6215 _local_interfaces); 6216 6217 // Size of Java itable (in words) 6218 _itable_size = is_interface() ? 0 : 6219 klassItable::compute_itable_size(_transitive_interfaces); 6220 6221 assert(_parsed_annotations != nullptr, "invariant"); 6222 6223 if (Arguments::is_valhalla_enabled()) { 6224 fetch_field_classes(cp, CHECK); 6225 } 6226 6227 _layout_info = new FieldLayoutInfo(); 6228 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info, 6229 _parsed_annotations->is_contended(), is_inline_type(), 6230 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(), 6231 _must_be_atomic, _layout_info, _inline_layout_info_array); 6232 lb.build_layout(); 6233 6234 // If it turned out that we didn't inline any of the fields, we deallocate 6235 // the array of InlineLayoutInfo since it isn't needed, and so it isn't 6236 // transferred to the allocated InstanceKlass. 6237 if (_inline_layout_info_array != nullptr && !_layout_info->_has_inlined_fields) { 6238 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array); 6239 _inline_layout_info_array = nullptr; 6240 } 6241 6242 int injected_fields_count = _temp_field_info->length() - _java_fields_count; 6243 _fieldinfo_stream = 6244 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count, 6245 injected_fields_count, loader_data(), CHECK); 6246 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK); 6247 _fields_status = 6248 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(), 6249 FieldStatus(0), CHECK); 6250 6251 // Strict static fields track initialization status from the beginning of time. 6252 // After this class runs <clinit>, they will be verified as being "not unset". 6253 // See Step 8 of InstanceKlass::initialize_impl. 6254 if (_has_strict_static_fields) { 6255 bool found_one = false; 6256 for (int i = 0; i < _temp_field_info->length(); i++) { 6257 FieldInfo& fi = *_temp_field_info->adr_at(i); 6258 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) { 6259 found_one = true; 6260 if (fi.initializer_index() != 0) { 6261 // skip strict static fields with ConstantValue attributes 6262 } else { 6263 _fields_status->adr_at(fi.index())->update_strict_static_unset(true); 6264 _fields_status->adr_at(fi.index())->update_strict_static_unread(true); 6265 } 6266 } 6267 } 6268 assert(found_one == _has_strict_static_fields, 6269 "correct prediction = %d", (int)_has_strict_static_fields); 6270 } 6271 } 6272 6273 // In order to be able to optimize fields layouts by applying heap flattening, 6274 // the JVM needs to know the layout of the class of the fields, which implies 6275 // having these classes loaded. The strategy has two folds: 6276 // 1 - if the current class has a LoadableDescriptors attribute containing the 6277 // name of the class of the field and PreloadClasses is true, the JVM will 6278 // try to speculatively load this class. Failures to load the class are 6279 // silently discarded, and loadings resulting in a non-optimizable class 6280 // are ignored 6281 // 2 - if step 1 cannot be applied, the JVM will simply check if the class 6282 // loader of the current class already knows these classes (no class 6283 // loading triggered in this case). Note that the migrated value classes 6284 // of the JDK are automatically registered to all class loaders, and 6285 // are guaranteed to be found in this step even if the current class 6286 // has not been recompiled with JEP 401 features enabled 6287 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) { 6288 for (FieldInfo fieldinfo : *_temp_field_info) { 6289 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time 6290 Symbol* sig = fieldinfo.signature(cp); 6291 if (Signature::has_envelope(sig)) { 6292 TempNewSymbol name = Signature::strip_envelope(sig); 6293 if (name == _class_name) continue; 6294 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) { 6295 log_info(class, preload)("Preloading of class %s during loading of class %s. " 6296 "Cause: field type in LoadableDescriptors attribute", 6297 name->as_C_string(), _class_name->as_C_string()); 6298 oop loader = loader_data()->class_loader(); 6299 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name, 6300 Handle(THREAD, loader), 6301 false, THREAD); 6302 6303 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same"); 6304 6305 if (klass != nullptr) { 6306 if (klass->is_inline_klass()) { 6307 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK); 6308 log_info(class, preload)("Preloading of class %s during loading of class %s " 6309 "(cause: field type in LoadableDescriptors attribute) succeeded", 6310 name->as_C_string(), _class_name->as_C_string()); 6311 } else { 6312 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log this 6313 log_info(class, preload)("Preloading of class %s during loading of class %s " 6314 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class", 6315 name->as_C_string(), _class_name->as_C_string()); 6316 if (fieldinfo.field_flags().is_null_free_inline_type()) { 6317 log_warning(class, preload)("After preloading of class %s during loading of class %s " 6318 "field was annotated with @NullRestricted but loaded class is not a value class, " 6319 "the annotation is ignored", 6320 name->as_C_string(), _class_name->as_C_string()); 6321 fieldinfo.field_flags().update_null_free_inline_type(false); 6322 } 6323 } 6324 } else { 6325 log_info(class, preload)("Preloading of class %s during loading of class %s " 6326 "(cause: field type in LoadableDescriptors attribute) failed : %s", 6327 name->as_C_string(), _class_name->as_C_string(), 6328 PENDING_EXCEPTION->klass()->name()->as_C_string()); 6329 if (fieldinfo.field_flags().is_null_free_inline_type()) { 6330 log_warning(class, preload)("After preloading of class %s during loading of class %s failed," 6331 "field was annotated with @NullRestricted but class is unknown, " 6332 "the annotation is ignored", 6333 name->as_C_string(), _class_name->as_C_string()); 6334 fieldinfo.field_flags().update_null_free_inline_type(false); 6335 } 6336 6337 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not 6338 // impact loading of current class. 6339 CLEAR_PENDING_EXCEPTION; 6340 } 6341 } else { 6342 oop loader = loader_data()->class_loader(); 6343 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader)); 6344 if (klass != nullptr && klass->is_inline_klass()) { 6345 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK); 6346 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary" 6347 "(field type not in LoadableDescriptors attribute)", 6348 _class_name->as_C_string(), name->as_C_string()); 6349 } else if (fieldinfo.field_flags().is_null_free_inline_type()) { 6350 if (klass == nullptr) { 6351 log_warning(class, preload)("During loading of class %s, class %s is unknown, " 6352 "but a field of this type was annotated with @NullRestricted, " 6353 "the annotation is ignored", 6354 _class_name->as_C_string(), name->as_C_string()); 6355 } else { 6356 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary " 6357 "and is not a concrete value class, but a field of this type was annotated with " 6358 "@NullRestricted, the annotation is ignored", 6359 _class_name->as_C_string(), name->as_C_string()); 6360 } 6361 fieldinfo.field_flags().update_null_free_inline_type(false); 6362 } 6363 } 6364 } 6365 } 6366 } 6367 6368 void ClassFileParser::set_klass(InstanceKlass* klass) { 6369 6370 #ifdef ASSERT 6371 if (klass != nullptr) { 6372 assert(nullptr == _klass, "leaking?"); 6373 } 6374 #endif 6375 6376 _klass = klass; 6377 } 6378 6379 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) { 6380 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count()); 6381 6382 // The array of InlineLayoutInfo is allocated on demand. This way the array is 6383 // never allocated for an InstanceKlass which has no need for this information. 6384 if (_inline_layout_info_array == nullptr) { 6385 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data, 6386 java_fields_count(), 6387 CHECK); 6388 } 6389 6390 // Set the Klass for the field's index 6391 _inline_layout_info_array->adr_at(field_index)->set_klass(ik); 6392 } 6393 6394 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6395 6396 #ifdef ASSERT 6397 if (klass != nullptr) { 6398 assert(nullptr == _klass_to_deallocate, "leaking?"); 6399 } 6400 #endif 6401 6402 _klass_to_deallocate = klass; 6403 } 6404 6405 // Caller responsible for ResourceMark 6406 // clone stream with rewound position 6407 const ClassFileStream* ClassFileParser::clone_stream() const { 6408 assert(_stream != nullptr, "invariant"); 6409 6410 return _stream->clone(); 6411 } 6412 6413 ReferenceType ClassFileParser::super_reference_type() const { 6414 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type(); 6415 } 6416 6417 bool ClassFileParser::is_instance_ref_klass() const { 6418 // Only the subclasses of j.l.r.Reference are InstanceRefKlass. 6419 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a 6420 // klass requiring special treatment in ref-processing. The abstract 6421 // j.l.r.Reference cannot be instantiated so doesn't partake in 6422 // ref-processing. 6423 return is_java_lang_ref_Reference_subclass(); 6424 } 6425 6426 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const { 6427 if (_super_klass == nullptr) { 6428 return false; 6429 } 6430 6431 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) { 6432 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom 6433 return true; 6434 } 6435 6436 return _super_klass->reference_type() != REF_NONE; 6437 } 6438 6439 // ---------------------------------------------------------------------------- 6440 // debugging 6441 6442 #ifdef ASSERT 6443 6444 // return true if class_name contains no '.' (internal format is '/') 6445 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6446 if (class_name != nullptr) { 6447 ResourceMark rm; 6448 char* name = class_name->as_C_string(); 6449 return strchr(name, JVM_SIGNATURE_DOT) == nullptr; 6450 } else { 6451 return true; 6452 } 6453 } 6454 6455 #endif --- EOF ---