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/systemDictionaryShared.hpp" 39 #include "classfile/verificationType.hpp" 40 #include "classfile/verifier.hpp" 41 #include "classfile/vmClasses.hpp" 42 #include "classfile/vmSymbols.hpp" 43 #include "jvm.h" 44 #include "logging/log.hpp" 45 #include "logging/logStream.hpp" 46 #include "memory/allocation.hpp" 47 #include "memory/metadataFactory.hpp" 48 #include "memory/oopFactory.hpp" 49 #include "memory/resourceArea.hpp" 50 #include "memory/universe.hpp" 51 #include "oops/annotations.hpp" 52 #include "oops/bsmAttribute.inline.hpp" 53 #include "oops/constantPool.inline.hpp" 54 #include "oops/fieldInfo.hpp" 55 #include "oops/fieldStreams.inline.hpp" 56 #include "oops/inlineKlass.inline.hpp" 57 #include "oops/instanceKlass.inline.hpp" 58 #include "oops/instanceMirrorKlass.hpp" 59 #include "oops/klass.inline.hpp" 60 #include "oops/klassVtable.hpp" 61 #include "oops/metadata.hpp" 62 #include "oops/method.inline.hpp" 63 #include "oops/oop.inline.hpp" 64 #include "oops/recordComponent.hpp" 65 #include "oops/symbol.hpp" 66 #include "prims/jvmtiExport.hpp" 67 #include "prims/jvmtiThreadState.hpp" 68 #include "runtime/arguments.hpp" 69 #include "runtime/fieldDescriptor.inline.hpp" 70 #include "runtime/handles.inline.hpp" 71 #include "runtime/javaCalls.hpp" 72 #include "runtime/os.hpp" 73 #include "runtime/perfData.hpp" 74 #include "runtime/reflection.hpp" 75 #include "runtime/safepointVerifiers.hpp" 76 #include "runtime/signature.hpp" 77 #include "runtime/timer.hpp" 78 #include "services/classLoadingService.hpp" 79 #include "services/threadService.hpp" 80 #include "utilities/align.hpp" 81 #include "utilities/bitMap.inline.hpp" 82 #include "utilities/checkedCast.hpp" 83 #include "utilities/copy.hpp" 84 #include "utilities/exceptions.hpp" 85 #include "utilities/formatBuffer.hpp" 86 #include "utilities/globalDefinitions.hpp" 87 #include "utilities/growableArray.hpp" 88 #include "utilities/hashTable.hpp" 89 #include "utilities/macros.hpp" 90 #include "utilities/ostream.hpp" 91 #include "utilities/stringUtils.hpp" 92 #include "utilities/utf8.hpp" 93 94 // We generally try to create the oops directly when parsing, rather than 95 // allocating temporary data structures and copying the bytes twice. A 96 // temporary area is only needed when parsing utf8 entries in the constant 97 // pool and when parsing line number tables. 98 99 // We add assert in debug mode when class format is not checked. 100 101 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 102 #define JAVA_MIN_SUPPORTED_VERSION 45 103 #define JAVA_PREVIEW_MINOR_VERSION 65535 104 105 // Used for two backward compatibility reasons: 106 // - to check for new additions to the class file format in JDK1.5 107 // - to check for bug fixes in the format checker in JDK1.5 108 #define JAVA_1_5_VERSION 49 109 110 // Used for backward compatibility reasons: 111 // - to check for javac bug fixes that happened after 1.5 112 // - also used as the max version when running in jdk6 113 #define JAVA_6_VERSION 50 114 115 // Used for backward compatibility reasons: 116 // - to disallow argument and require ACC_STATIC for <clinit> methods 117 #define JAVA_7_VERSION 51 118 119 // Extension method support. 120 #define JAVA_8_VERSION 52 121 122 #define JAVA_9_VERSION 53 123 124 #define JAVA_10_VERSION 54 125 126 #define JAVA_11_VERSION 55 127 128 #define JAVA_12_VERSION 56 129 130 #define JAVA_13_VERSION 57 131 132 #define JAVA_14_VERSION 58 133 134 #define JAVA_15_VERSION 59 135 136 #define JAVA_16_VERSION 60 137 138 #define JAVA_17_VERSION 61 139 140 #define JAVA_18_VERSION 62 141 142 #define JAVA_19_VERSION 63 143 144 #define JAVA_20_VERSION 64 145 146 #define JAVA_21_VERSION 65 147 148 #define JAVA_22_VERSION 66 149 150 #define JAVA_23_VERSION 67 151 152 #define JAVA_24_VERSION 68 153 154 #define JAVA_25_VERSION 69 155 156 #define JAVA_26_VERSION 70 157 158 #define JAVA_27_VERSION 71 159 160 #define JAVA_28_VERSION 72 161 162 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 if (is_static) { 1530 _has_null_restricted_static_fields = true; 1531 } 1532 } 1533 1534 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1535 1536 // Update number of static oop fields. 1537 if (is_static && is_reference_type(type)) { 1538 _static_oop_count++; 1539 } 1540 1541 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags); 1542 fi.set_index(n); 1543 if (fieldFlags.is_generic()) { 1544 fi.set_generic_signature_index(generic_signature_index); 1545 } 1546 parsed_annotations.apply_to(&fi); 1547 if (fi.field_flags().is_contended()) { 1548 _has_contended_fields = true; 1549 } 1550 if (access_flags.is_strict() && access_flags.is_static()) { 1551 _has_strict_static_fields = true; 1552 } 1553 _temp_field_info->append(fi); 1554 } 1555 assert(_temp_field_info->length() == length, "Must be"); 1556 1557 if (num_injected != 0) { 1558 for (int n = 0; n < num_injected; n++) { 1559 // Check for duplicates 1560 if (injected[n].may_be_java) { 1561 const Symbol* const name = injected[n].name(); 1562 const Symbol* const signature = injected[n].signature(); 1563 bool duplicate = false; 1564 for (int i = 0; i < length; i++) { 1565 const FieldInfo* const f = _temp_field_info->adr_at(i); 1566 if (name == cp->symbol_at(f->name_index()) && 1567 signature == cp->symbol_at(f->signature_index())) { 1568 // Symbol is desclared in Java so skip this one 1569 duplicate = true; 1570 break; 1571 } 1572 } 1573 if (duplicate) { 1574 // These will be removed from the field array at the end 1575 continue; 1576 } 1577 } 1578 1579 // Injected field 1580 FieldInfo::FieldFlags fflags(0); 1581 fflags.update_injected(true); 1582 AccessFlags aflags; 1583 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags); 1584 int idx = _temp_field_info->append(fi); 1585 _temp_field_info->adr_at(idx)->set_index(idx); 1586 } 1587 } 1588 1589 if (is_inline_type) { 1590 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero. 1591 // It should never be seen by user code, it is used when writing "null" to a nullable flat field 1592 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects 1593 // alive. 1594 FieldInfo::FieldFlags fflags2(0); 1595 fflags2.update_injected(true); 1596 AccessFlags aflags2(JVM_ACC_STATIC); 1597 FieldInfo fi2(aflags2, 1598 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)), 1599 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)), 1600 0, 1601 fflags2); 1602 int idx2 = _temp_field_info->append(fi2); 1603 _temp_field_info->adr_at(idx2)->set_index(idx2); 1604 _static_oop_count++; 1605 } 1606 if (!access_flags().is_identity_class() && !access_flags().is_interface() 1607 && _class_name != vmSymbols::java_lang_Object()) { 1608 // Acmp map ".acmp_maps" required for abstract and concrete value classes 1609 FieldInfo::FieldFlags fflags2(0); 1610 fflags2.update_injected(true); 1611 fflags2.update_stable(true); 1612 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL); 1613 FieldInfo fi3(aflags2, 1614 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)), 1615 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)), 1616 0, 1617 fflags2); 1618 int idx2 = _temp_field_info->append(fi3); 1619 _temp_field_info->adr_at(idx2)->set_index(idx2); 1620 _static_oop_count++; 1621 } 1622 1623 if (_need_verify && length > 1) { 1624 // Check duplicated fields 1625 ResourceMark rm(THREAD); 1626 // Set containing name-signature pairs 1627 NameSigHashtable* names_and_sigs = new NameSigHashtable(); 1628 for (int i = 0; i < _temp_field_info->length(); i++) { 1629 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp), 1630 _temp_field_info->adr_at(i)->signature(_cp)); 1631 // If no duplicates, add name/signature in hashtable names_and_sigs. 1632 if(!names_and_sigs->put(name_and_sig, 0)) { 1633 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1634 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); 1635 return; 1636 } 1637 } 1638 } 1639 } 1640 1641 1642 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1643 u4 code_length, 1644 u4 exception_table_length, 1645 TRAPS) { 1646 assert(cfs != nullptr, "invariant"); 1647 1648 const unsafe_u2* const exception_table_start = cfs->current(); 1649 assert(exception_table_start != nullptr, "null exception table"); 1650 1651 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1652 // end_pc, 1653 // handler_pc, 1654 // catch_type_index 1655 1656 // Will check legal target after parsing code array in verifier. 1657 if (_need_verify) { 1658 for (unsigned int i = 0; i < exception_table_length; i++) { 1659 const u2 start_pc = cfs->get_u2_fast(); 1660 const u2 end_pc = cfs->get_u2_fast(); 1661 const u2 handler_pc = cfs->get_u2_fast(); 1662 const u2 catch_type_index = cfs->get_u2_fast(); 1663 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1664 "Illegal exception table range in class file %s", 1665 CHECK_NULL); 1666 guarantee_property(handler_pc < code_length, 1667 "Illegal exception table handler in class file %s", 1668 CHECK_NULL); 1669 if (catch_type_index != 0) { 1670 guarantee_property(valid_klass_reference_at(catch_type_index), 1671 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1672 } 1673 } 1674 } else { 1675 cfs->skip_u2_fast(exception_table_length * 4); 1676 } 1677 return exception_table_start; 1678 } 1679 1680 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1681 u4 code_length, 1682 CompressedLineNumberWriteStream**const write_stream, 1683 TRAPS) { 1684 1685 const ClassFileStream* const cfs = _stream; 1686 unsigned int num_entries = cfs->get_u2(CHECK); 1687 1688 // Each entry is a u2 start_pc, and a u2 line_number 1689 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1690 1691 // Verify line number attribute and table length 1692 guarantee_property( 1693 code_attribute_length == sizeof(u2) + length_in_bytes, 1694 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1695 1696 cfs->guarantee_more(length_in_bytes, CHECK); 1697 1698 if ((*write_stream) == nullptr) { 1699 if (length_in_bytes > fixed_buffer_size) { 1700 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1701 } else { 1702 (*write_stream) = new CompressedLineNumberWriteStream( 1703 _linenumbertable_buffer, fixed_buffer_size); 1704 } 1705 } 1706 1707 while (num_entries-- > 0) { 1708 const u2 bci = cfs->get_u2_fast(); // start_pc 1709 const u2 line = cfs->get_u2_fast(); // line_number 1710 guarantee_property(bci < code_length, 1711 "Invalid pc in LineNumberTable in class file %s", CHECK); 1712 (*write_stream)->write_pair(bci, line); 1713 } 1714 } 1715 1716 1717 class LVT_Hash : public AllStatic { 1718 public: 1719 1720 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1721 /* 1722 * 3-tuple start_bci/length/slot has to be unique key, 1723 * so the following comparison seems to be redundant: 1724 * && elem->name_cp_index == entry->_elem->name_cp_index 1725 */ 1726 return (e0.start_bci == e1.start_bci && 1727 e0.length == e1.length && 1728 e0.name_cp_index == e1.name_cp_index && 1729 e0.slot == e1.slot); 1730 } 1731 1732 static unsigned int hash(LocalVariableTableElement const& e0) { 1733 unsigned int raw_hash = e0.start_bci; 1734 1735 raw_hash = e0.length + raw_hash * 37; 1736 raw_hash = e0.name_cp_index + raw_hash * 37; 1737 raw_hash = e0.slot + raw_hash * 37; 1738 1739 return raw_hash; 1740 } 1741 }; 1742 1743 1744 // Class file LocalVariableTable elements. 1745 class Classfile_LVT_Element { 1746 public: 1747 u2 start_bci; 1748 u2 length; 1749 u2 name_cp_index; 1750 u2 descriptor_cp_index; 1751 u2 slot; 1752 }; 1753 1754 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1755 LocalVariableTableElement* const lvt) { 1756 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1757 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1758 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1759 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1760 lvt->signature_cp_index = 0; 1761 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1762 } 1763 1764 // Function is used to parse both attributes: 1765 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1766 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1767 u4 code_length, 1768 u2 max_locals, 1769 u4 code_attribute_length, 1770 u2* const localvariable_table_length, 1771 bool isLVTT, 1772 TRAPS) { 1773 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1774 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1775 const unsigned int size = checked_cast<unsigned>( 1776 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2)); 1777 1778 const ConstantPool* const cp = _cp; 1779 1780 // Verify local variable table attribute has right length 1781 if (_need_verify) { 1782 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1783 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1784 } 1785 1786 const unsafe_u2* const localvariable_table_start = cfs->current(); 1787 assert(localvariable_table_start != nullptr, "null local variable table"); 1788 if (!_need_verify) { 1789 cfs->skip_u2_fast(size); 1790 } else { 1791 cfs->guarantee_more(size * 2, CHECK_NULL); 1792 for(int i = 0; i < (*localvariable_table_length); i++) { 1793 const u2 start_pc = cfs->get_u2_fast(); 1794 const u2 length = cfs->get_u2_fast(); 1795 const u2 name_index = cfs->get_u2_fast(); 1796 const u2 descriptor_index = cfs->get_u2_fast(); 1797 const u2 index = cfs->get_u2_fast(); 1798 // Assign to a u4 to avoid overflow 1799 const u4 end_pc = (u4)start_pc + (u4)length; 1800 1801 if (start_pc >= code_length) { 1802 classfile_parse_error( 1803 "Invalid start_pc %u in %s in class file %s", 1804 start_pc, tbl_name, THREAD); 1805 return nullptr; 1806 } 1807 if (end_pc > code_length) { 1808 classfile_parse_error( 1809 "Invalid length %u in %s in class file %s", 1810 length, tbl_name, THREAD); 1811 return nullptr; 1812 } 1813 const int cp_size = cp->length(); 1814 guarantee_property(valid_symbol_at(name_index), 1815 "Name index %u in %s has bad constant type in class file %s", 1816 name_index, tbl_name, CHECK_NULL); 1817 guarantee_property(valid_symbol_at(descriptor_index), 1818 "Signature index %u in %s has bad constant type in class file %s", 1819 descriptor_index, tbl_name, CHECK_NULL); 1820 1821 const Symbol* const name = cp->symbol_at(name_index); 1822 const Symbol* const sig = cp->symbol_at(descriptor_index); 1823 verify_legal_field_name(name, CHECK_NULL); 1824 u2 extra_slot = 0; 1825 if (!isLVTT) { 1826 verify_legal_field_signature(name, sig, CHECK_NULL); 1827 1828 // 4894874: check special cases for double and long local variables 1829 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1830 sig == vmSymbols::type_signature(T_LONG)) { 1831 extra_slot = 1; 1832 } 1833 } 1834 guarantee_property((index + extra_slot) < max_locals, 1835 "Invalid index %u in %s in class file %s", 1836 index, tbl_name, CHECK_NULL); 1837 } 1838 } 1839 return localvariable_table_start; 1840 } 1841 1842 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1843 u4 code_attribute_length, 1844 TRAPS) { 1845 assert(cfs != nullptr, "invariant"); 1846 1847 if (0 == code_attribute_length) { 1848 return nullptr; 1849 } 1850 1851 const u1* const stackmap_table_start = cfs->current(); 1852 assert(stackmap_table_start != nullptr, "null stackmap table"); 1853 1854 // check code_attribute_length 1855 cfs->skip_u1(code_attribute_length, CHECK_NULL); 1856 1857 return stackmap_table_start; 1858 } 1859 1860 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 1861 u2* const checked_exceptions_length, 1862 u4 method_attribute_length, 1863 TRAPS) { 1864 assert(cfs != nullptr, "invariant"); 1865 assert(checked_exceptions_length != nullptr, "invariant"); 1866 1867 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1868 *checked_exceptions_length = cfs->get_u2_fast(); 1869 const unsigned int size = 1870 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1871 const unsafe_u2* const checked_exceptions_start = cfs->current(); 1872 assert(checked_exceptions_start != nullptr, "null checked exceptions"); 1873 if (!_need_verify) { 1874 cfs->skip_u2_fast(size); 1875 } else { 1876 // Verify each value in the checked exception table 1877 u2 checked_exception; 1878 const u2 len = *checked_exceptions_length; 1879 cfs->guarantee_more(2 * len, CHECK_NULL); 1880 for (int i = 0; i < len; i++) { 1881 checked_exception = cfs->get_u2_fast(); 1882 guarantee_property( 1883 valid_klass_reference_at(checked_exception), 1884 "Exception name has bad type at constant pool %u in class file %s", 1885 checked_exception, CHECK_NULL); 1886 } 1887 } 1888 // check exceptions attribute length 1889 if (_need_verify) { 1890 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1891 sizeof(u2) * size), 1892 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1893 } 1894 return checked_exceptions_start; 1895 } 1896 1897 void ClassFileParser::throwIllegalSignature(const char* type, 1898 const Symbol* name, 1899 const Symbol* sig, 1900 TRAPS) const { 1901 assert(name != nullptr, "invariant"); 1902 assert(sig != nullptr, "invariant"); 1903 1904 ResourceMark rm(THREAD); 1905 // Names are all known to be < 64k so we know this formatted message is not excessively large. 1906 Exceptions::fthrow(THREAD_AND_LOCATION, 1907 vmSymbols::java_lang_ClassFormatError(), 1908 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1909 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1910 } 1911 1912 AnnotationCollector::ID 1913 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 1914 const Symbol* name, 1915 const bool can_access_vm_annotations) { 1916 const vmSymbolID sid = vmSymbols::find_sid(name); 1917 // Privileged code can use all annotations. Other code silently drops some. 1918 const bool privileged = loader_data->is_boot_class_loader_data() || 1919 loader_data->is_platform_class_loader_data() || 1920 can_access_vm_annotations; 1921 switch (sid) { 1922 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 1923 if (_location != _in_method) break; // only allow for methods 1924 if (!privileged) break; // only allow in privileged code 1925 return _method_CallerSensitive; 1926 } 1927 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 1928 if (_location != _in_method) break; // only allow for methods 1929 if (!privileged) break; // only allow in privileged code 1930 return _method_ForceInline; 1931 } 1932 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 1933 if (_location != _in_method) break; // only allow for methods 1934 if (!privileged) break; // only allow in privileged code 1935 return _method_DontInline; 1936 } 1937 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): { 1938 if (_location != _in_method) break; // only allow for methods 1939 if (!privileged) break; // only allow in privileged code 1940 return _method_ChangesCurrentThread; 1941 } 1942 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): { 1943 if (_location != _in_method) break; // only allow for methods 1944 if (!privileged) break; // only allow in privileged code 1945 return _method_JvmtiHideEvents; 1946 } 1947 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): { 1948 if (_location != _in_method) break; // only allow for methods 1949 if (!privileged) break; // only allow in privileged code 1950 return _method_JvmtiMountTransition; 1951 } 1952 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 1953 if (_location != _in_method) break; // only allow for methods 1954 if (!privileged) break; // only allow in privileged code 1955 return _method_InjectedProfile; 1956 } 1957 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 1958 if (_location != _in_method) break; // only allow for methods 1959 if (!privileged) break; // only allow in privileged code 1960 return _method_LambdaForm_Compiled; 1961 } 1962 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 1963 if (_location != _in_method) break; // only allow for methods 1964 if (!privileged) break; // only allow in privileged code 1965 return _method_Hidden; 1966 } 1967 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): { 1968 if (_location != _in_method) break; // only allow for methods 1969 if (!privileged) break; // only allow in privileged code 1970 return _method_Scoped; 1971 } 1972 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): { 1973 if (_location != _in_method) break; // only allow for methods 1974 if (!privileged) break; // only allow in privileged code 1975 return _method_IntrinsicCandidate; 1976 } 1977 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 1978 if (_location != _in_field) break; // only allow for fields 1979 if (!privileged) break; // only allow in privileged code 1980 return _field_Stable; 1981 } 1982 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_TrustFinalFields_signature): { 1983 if (_location != _in_class) break; // only allow for classes 1984 if (!privileged) break; // only allow in privileged code 1985 return _jdk_internal_vm_annotation_TrustFinalFields; 1986 } 1987 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 1988 if (_location != _in_field && _location != _in_class) { 1989 break; // only allow for fields and classes 1990 } 1991 if (!EnableContended || (RestrictContended && !privileged)) { 1992 break; // honor privileges 1993 } 1994 return _jdk_internal_vm_annotation_Contended; 1995 } 1996 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 1997 if (_location != _in_method) break; // only allow for methods 1998 if (RestrictReservedStack && !privileged) break; // honor privileges 1999 return _jdk_internal_vm_annotation_ReservedStackAccess; 2000 } 2001 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): { 2002 if (_location != _in_class) break; // only allow for classes 2003 if (!privileged) break; // only allow in privileged code 2004 return _jdk_internal_ValueBased; 2005 } 2006 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): { 2007 if (_location != _in_class) break; // only allow for classes 2008 return _jdk_internal_LooselyConsistentValue; 2009 } 2010 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): { 2011 if (_location != _in_field) break; // only allow for fields 2012 return _jdk_internal_NullRestricted; 2013 } 2014 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): { 2015 return _java_lang_Deprecated; 2016 } 2017 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): { 2018 if (_location != _in_class) break; // only allow for classes 2019 if (!privileged) break; // only allow in privileged code 2020 return _jdk_internal_vm_annotation_AOTSafeClassInitializer; 2021 } 2022 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): { 2023 if (_location != _in_method) break; // only allow for methods 2024 if (!privileged) break; // only allow in privileged code 2025 return _method_AOTRuntimeSetup; 2026 } 2027 default: { 2028 break; 2029 } 2030 } 2031 return AnnotationCollector::_unknown; 2032 } 2033 2034 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2035 if (is_contended()) 2036 // Setting the contended group also sets the contended bit in field flags 2037 f->set_contended_group(contended_group()); 2038 if (is_stable()) 2039 (f->field_flags_addr())->update_stable(true); 2040 } 2041 2042 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2043 // If there's an error deallocate metadata for field annotations 2044 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2045 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2046 } 2047 2048 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2049 if (has_annotation(_method_CallerSensitive)) 2050 m->set_caller_sensitive(); 2051 if (has_annotation(_method_ForceInline)) 2052 m->set_force_inline(); 2053 if (has_annotation(_method_DontInline)) 2054 m->set_dont_inline(); 2055 if (has_annotation(_method_ChangesCurrentThread)) 2056 m->set_changes_current_thread(); 2057 if (has_annotation(_method_JvmtiHideEvents)) 2058 m->set_jvmti_hide_events(); 2059 if (has_annotation(_method_JvmtiMountTransition)) 2060 m->set_jvmti_mount_transition(); 2061 if (has_annotation(_method_InjectedProfile)) 2062 m->set_has_injected_profile(); 2063 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2064 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2065 if (has_annotation(_method_Hidden)) 2066 m->set_is_hidden(); 2067 if (has_annotation(_method_Scoped)) 2068 m->set_scoped(); 2069 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic()) 2070 m->set_intrinsic_candidate(); 2071 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2072 m->set_has_reserved_stack_access(); 2073 if (has_annotation(_java_lang_Deprecated)) 2074 m->set_deprecated(); 2075 if (has_annotation(_java_lang_Deprecated_for_removal)) 2076 m->set_deprecated_for_removal(); 2077 } 2078 2079 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2080 assert(ik != nullptr, "invariant"); 2081 if (has_annotation(_jdk_internal_vm_annotation_Contended)) { 2082 ik->set_is_contended(is_contended()); 2083 } 2084 if (has_annotation(_jdk_internal_ValueBased)) { 2085 ik->set_has_value_based_class_annotation(); 2086 if (DiagnoseSyncOnValueBasedClasses) { 2087 ik->set_is_value_based(); 2088 } 2089 } 2090 if (has_annotation(_java_lang_Deprecated)) { 2091 Array<Method*>* methods = ik->methods(); 2092 int length = ik->methods()->length(); 2093 for (int i = 0; i < length; i++) { 2094 Method* m = methods->at(i); 2095 m->set_deprecated(); 2096 } 2097 } 2098 if (has_annotation(_java_lang_Deprecated_for_removal)) { 2099 Array<Method*>* methods = ik->methods(); 2100 int length = ik->methods()->length(); 2101 for (int i = 0; i < length; i++) { 2102 Method* m = methods->at(i); 2103 m->set_deprecated_for_removal(); 2104 } 2105 } 2106 if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) { 2107 ik->set_has_aot_safe_initializer(); 2108 } 2109 if (has_annotation(_jdk_internal_vm_annotation_TrustFinalFields)) { 2110 ik->set_trust_final_fields(true); 2111 } 2112 } 2113 2114 #define MAX_ARGS_SIZE 255 2115 #define MAX_CODE_SIZE 65535 2116 #define INITIAL_MAX_LVT_NUMBER 256 2117 2118 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2119 * 2120 * Rules for LVT's and LVTT's are: 2121 * - There can be any number of LVT's and LVTT's. 2122 * - If there are n LVT's, it is the same as if there was just 2123 * one LVT containing all the entries from the n LVT's. 2124 * - There may be no more than one LVT entry per local variable. 2125 * Two LVT entries are 'equal' if these fields are the same: 2126 * start_pc, length, name, slot 2127 * - There may be no more than one LVTT entry per each LVT entry. 2128 * Each LVTT entry has to match some LVT entry. 2129 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2130 */ 2131 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2132 int lvt_cnt, 2133 u2* const localvariable_table_length, 2134 const unsafe_u2** const localvariable_table_start, 2135 int lvtt_cnt, 2136 u2* const localvariable_type_table_length, 2137 const unsafe_u2** const localvariable_type_table_start, 2138 TRAPS) { 2139 2140 ResourceMark rm(THREAD); 2141 2142 typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*, 2143 256, AnyObj::RESOURCE_AREA, mtInternal, 2144 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2145 2146 LVT_HashTable* const table = new LVT_HashTable(); 2147 2148 // To fill LocalVariableTable in 2149 const Classfile_LVT_Element* cf_lvt; 2150 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2151 2152 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2153 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2154 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2155 copy_lvt_element(&cf_lvt[idx], lvt); 2156 // If no duplicates, add LVT elem in hashtable. 2157 if (table->put(*lvt, lvt) == false 2158 && _need_verify 2159 && _major_version >= JAVA_1_5_VERSION) { 2160 classfile_parse_error("Duplicated LocalVariableTable attribute " 2161 "entry for '%s' in class file %s", 2162 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2163 THREAD); 2164 return; 2165 } 2166 } 2167 } 2168 2169 // To merge LocalVariableTable and LocalVariableTypeTable 2170 const Classfile_LVT_Element* cf_lvtt; 2171 LocalVariableTableElement lvtt_elem; 2172 2173 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2174 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2175 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2176 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2177 LocalVariableTableElement** entry = table->get(lvtt_elem); 2178 if (entry == nullptr) { 2179 if (_need_verify) { 2180 classfile_parse_error("LVTT entry for '%s' in class file %s " 2181 "does not match any LVT entry", 2182 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2183 THREAD); 2184 return; 2185 } 2186 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2187 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2188 "entry for '%s' in class file %s", 2189 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2190 THREAD); 2191 return; 2192 } else { 2193 // to add generic signatures into LocalVariableTable 2194 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2195 } 2196 } 2197 } 2198 } 2199 2200 2201 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2202 const u1* runtime_visible_annotations, 2203 int runtime_visible_annotations_length, 2204 const u1* runtime_visible_parameter_annotations, 2205 int runtime_visible_parameter_annotations_length, 2206 const u1* runtime_visible_type_annotations, 2207 int runtime_visible_type_annotations_length, 2208 const u1* annotation_default, 2209 int annotation_default_length, 2210 TRAPS) { 2211 2212 AnnotationArray* a; 2213 2214 if (runtime_visible_annotations_length > 0) { 2215 a = allocate_annotations(runtime_visible_annotations, 2216 runtime_visible_annotations_length, 2217 CHECK); 2218 cm->set_method_annotations(a); 2219 } 2220 2221 if (runtime_visible_parameter_annotations_length > 0) { 2222 a = allocate_annotations(runtime_visible_parameter_annotations, 2223 runtime_visible_parameter_annotations_length, 2224 CHECK); 2225 cm->set_parameter_annotations(a); 2226 } 2227 2228 if (annotation_default_length > 0) { 2229 a = allocate_annotations(annotation_default, 2230 annotation_default_length, 2231 CHECK); 2232 cm->set_default_annotations(a); 2233 } 2234 2235 if (runtime_visible_type_annotations_length > 0) { 2236 a = allocate_annotations(runtime_visible_type_annotations, 2237 runtime_visible_type_annotations_length, 2238 CHECK); 2239 cm->set_type_annotations(a); 2240 } 2241 } 2242 2243 2244 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2245 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2246 // Method* to save footprint, so we only know the size of the resulting Method* when the 2247 // entire method attribute is parsed. 2248 // 2249 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass. 2250 2251 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2252 bool is_interface, 2253 bool is_identity_class, 2254 const ConstantPool* cp, 2255 bool* const has_localvariable_table, 2256 TRAPS) { 2257 assert(cfs != nullptr, "invariant"); 2258 assert(cp != nullptr, "invariant"); 2259 assert(has_localvariable_table != nullptr, "invariant"); 2260 2261 ResourceMark rm(THREAD); 2262 // Parse fixed parts: 2263 // access_flags, name_index, descriptor_index, attributes_count 2264 cfs->guarantee_more(8, CHECK_NULL); 2265 2266 u2 flags = cfs->get_u2_fast(); 2267 const u2 name_index = cfs->get_u2_fast(); 2268 const int cp_size = cp->length(); 2269 guarantee_property( 2270 valid_symbol_at(name_index), 2271 "Illegal constant pool index %u for method name in class file %s", 2272 name_index, CHECK_NULL); 2273 const Symbol* const name = cp->symbol_at(name_index); 2274 verify_legal_method_name(name, CHECK_NULL); 2275 2276 const u2 signature_index = cfs->get_u2_fast(); 2277 guarantee_property( 2278 valid_symbol_at(signature_index), 2279 "Illegal constant pool index %u for method signature in class file %s", 2280 signature_index, CHECK_NULL); 2281 const Symbol* const signature = cp->symbol_at(signature_index); 2282 2283 if (name == vmSymbols::class_initializer_name()) { 2284 // We ignore the other access flags for a valid class initializer. 2285 // (JVM Spec 2nd ed., chapter 4.6) 2286 if (_major_version < 51) { // backward compatibility 2287 flags = JVM_ACC_STATIC; 2288 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2289 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0); 2290 } else { 2291 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD); 2292 return nullptr; 2293 } 2294 } else { 2295 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL); 2296 } 2297 2298 if (name == vmSymbols::object_initializer_name() && is_interface) { 2299 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD); 2300 return nullptr; 2301 } 2302 2303 if (Arguments::is_valhalla_enabled()) { 2304 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED) 2305 && ((flags & JVM_ACC_STATIC) == 0 ) 2306 && !_access_flags.is_identity_class()) { 2307 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD); 2308 return nullptr; 2309 } 2310 } 2311 2312 int args_size = -1; // only used when _need_verify is true 2313 if (_need_verify) { 2314 verify_legal_name_with_signature(name, signature, CHECK_NULL); 2315 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2316 verify_legal_method_signature(name, signature, CHECK_NULL); 2317 if (args_size > MAX_ARGS_SIZE) { 2318 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD); 2319 return nullptr; 2320 } 2321 } 2322 2323 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2324 2325 // Default values for code and exceptions attribute elements 2326 u2 max_stack = 0; 2327 u2 max_locals = 0; 2328 u4 code_length = 0; 2329 const u1* code_start = nullptr; 2330 u2 exception_table_length = 0; 2331 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements 2332 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2333 u2 checked_exceptions_length = 0; 2334 const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements 2335 CompressedLineNumberWriteStream* linenumber_table = nullptr; 2336 int linenumber_table_length = 0; 2337 int total_lvt_length = 0; 2338 u2 lvt_cnt = 0; 2339 u2 lvtt_cnt = 0; 2340 bool lvt_allocated = false; 2341 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2342 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2343 u2* localvariable_table_length = nullptr; 2344 const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes 2345 u2* localvariable_type_table_length = nullptr; 2346 const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes 2347 int method_parameters_length = -1; 2348 const u1* method_parameters_data = nullptr; 2349 bool method_parameters_seen = false; 2350 bool parsed_code_attribute = false; 2351 bool parsed_checked_exceptions_attribute = false; 2352 bool parsed_stackmap_attribute = false; 2353 // stackmap attribute - JDK1.5 2354 const u1* stackmap_data = nullptr; 2355 int stackmap_data_length = 0; 2356 u2 generic_signature_index = 0; 2357 MethodAnnotationCollector parsed_annotations; 2358 const u1* runtime_visible_annotations = nullptr; 2359 int runtime_visible_annotations_length = 0; 2360 const u1* runtime_visible_parameter_annotations = nullptr; 2361 int runtime_visible_parameter_annotations_length = 0; 2362 const u1* runtime_visible_type_annotations = nullptr; 2363 int runtime_visible_type_annotations_length = 0; 2364 bool runtime_invisible_annotations_exists = false; 2365 bool runtime_invisible_type_annotations_exists = false; 2366 bool runtime_invisible_parameter_annotations_exists = false; 2367 const u1* annotation_default = nullptr; 2368 int annotation_default_length = 0; 2369 2370 // Parse code and exceptions attribute 2371 u2 method_attributes_count = cfs->get_u2_fast(); 2372 while (method_attributes_count--) { 2373 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2374 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2375 const u4 method_attribute_length = cfs->get_u4_fast(); 2376 guarantee_property( 2377 valid_symbol_at(method_attribute_name_index), 2378 "Invalid method attribute name index %u in class file %s", 2379 method_attribute_name_index, CHECK_NULL); 2380 2381 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2382 if (method_attribute_name == vmSymbols::tag_code()) { 2383 // Parse Code attribute 2384 if (_need_verify) { 2385 guarantee_property( 2386 !access_flags.is_native() && !access_flags.is_abstract(), 2387 "Code attribute in native or abstract methods in class file %s", 2388 CHECK_NULL); 2389 } 2390 if (parsed_code_attribute) { 2391 classfile_parse_error("Multiple Code attributes in class file %s", 2392 THREAD); 2393 return nullptr; 2394 } 2395 parsed_code_attribute = true; 2396 2397 // Stack size, locals size, and code size 2398 cfs->guarantee_more(8, CHECK_NULL); 2399 max_stack = cfs->get_u2_fast(); 2400 max_locals = cfs->get_u2_fast(); 2401 code_length = cfs->get_u4_fast(); 2402 if (_need_verify) { 2403 guarantee_property(args_size <= max_locals, 2404 "Arguments can't fit into locals in class file %s", 2405 CHECK_NULL); 2406 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2407 "Invalid method Code length %u in class file %s", 2408 code_length, CHECK_NULL); 2409 } 2410 // Code pointer 2411 code_start = cfs->current(); 2412 assert(code_start != nullptr, "null code start"); 2413 cfs->guarantee_more(code_length, CHECK_NULL); 2414 cfs->skip_u1_fast(code_length); 2415 2416 // Exception handler table 2417 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2418 exception_table_length = cfs->get_u2_fast(); 2419 if (exception_table_length > 0) { 2420 exception_table_start = parse_exception_table(cfs, 2421 code_length, 2422 exception_table_length, 2423 CHECK_NULL); 2424 } 2425 2426 // Parse additional attributes in code attribute 2427 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2428 u2 code_attributes_count = cfs->get_u2_fast(); 2429 2430 unsigned int calculated_attribute_length = 0; 2431 2432 calculated_attribute_length = 2433 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2434 calculated_attribute_length += checked_cast<unsigned int>( 2435 code_length + 2436 sizeof(exception_table_length) + 2437 sizeof(code_attributes_count) + 2438 exception_table_length * 2439 ( sizeof(u2) + // start_pc 2440 sizeof(u2) + // end_pc 2441 sizeof(u2) + // handler_pc 2442 sizeof(u2) )); // catch_type_index 2443 2444 while (code_attributes_count--) { 2445 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2446 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2447 const u4 code_attribute_length = cfs->get_u4_fast(); 2448 calculated_attribute_length += code_attribute_length + 2449 (unsigned)sizeof(code_attribute_name_index) + 2450 (unsigned)sizeof(code_attribute_length); 2451 guarantee_property(valid_symbol_at(code_attribute_name_index), 2452 "Invalid code attribute name index %u in class file %s", 2453 code_attribute_name_index, 2454 CHECK_NULL); 2455 if (LoadLineNumberTables && 2456 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2457 // Parse and compress line number table 2458 parse_linenumber_table(code_attribute_length, 2459 code_length, 2460 &linenumber_table, 2461 CHECK_NULL); 2462 2463 } else if (LoadLocalVariableTables && 2464 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2465 // Parse local variable table 2466 if (!lvt_allocated) { 2467 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2468 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2469 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2470 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2471 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2472 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2473 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2474 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2475 lvt_allocated = true; 2476 } 2477 if (lvt_cnt == max_lvt_cnt) { 2478 max_lvt_cnt <<= 1; 2479 localvariable_table_length = REALLOC_RESOURCE_ARRAY(localvariable_table_length, lvt_cnt, max_lvt_cnt); 2480 localvariable_table_start = REALLOC_RESOURCE_ARRAY(localvariable_table_start, lvt_cnt, max_lvt_cnt); 2481 } 2482 localvariable_table_start[lvt_cnt] = 2483 parse_localvariable_table(cfs, 2484 code_length, 2485 max_locals, 2486 code_attribute_length, 2487 &localvariable_table_length[lvt_cnt], 2488 false, // is not LVTT 2489 CHECK_NULL); 2490 total_lvt_length += localvariable_table_length[lvt_cnt]; 2491 lvt_cnt++; 2492 } else if (LoadLocalVariableTypeTables && 2493 _major_version >= JAVA_1_5_VERSION && 2494 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2495 if (!lvt_allocated) { 2496 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2497 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2498 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2499 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2500 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2501 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2502 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2503 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2504 lvt_allocated = true; 2505 } 2506 // Parse local variable type table 2507 if (lvtt_cnt == max_lvtt_cnt) { 2508 max_lvtt_cnt <<= 1; 2509 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2510 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2511 } 2512 localvariable_type_table_start[lvtt_cnt] = 2513 parse_localvariable_table(cfs, 2514 code_length, 2515 max_locals, 2516 code_attribute_length, 2517 &localvariable_type_table_length[lvtt_cnt], 2518 true, // is LVTT 2519 CHECK_NULL); 2520 lvtt_cnt++; 2521 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2522 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2523 // Stack map is only needed by the new verifier in JDK1.5. 2524 if (parsed_stackmap_attribute) { 2525 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD); 2526 return nullptr; 2527 } 2528 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL); 2529 stackmap_data_length = code_attribute_length; 2530 parsed_stackmap_attribute = true; 2531 } else { 2532 // Skip unknown attributes 2533 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2534 } 2535 } 2536 // check method attribute length 2537 if (_need_verify) { 2538 guarantee_property(method_attribute_length == calculated_attribute_length, 2539 "Code segment has wrong length in class file %s", 2540 CHECK_NULL); 2541 } 2542 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2543 // Parse Exceptions attribute 2544 if (parsed_checked_exceptions_attribute) { 2545 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2546 THREAD); 2547 return nullptr; 2548 } 2549 parsed_checked_exceptions_attribute = true; 2550 checked_exceptions_start = 2551 parse_checked_exceptions(cfs, 2552 &checked_exceptions_length, 2553 method_attribute_length, 2554 CHECK_NULL); 2555 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2556 // reject multiple method parameters 2557 if (method_parameters_seen) { 2558 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2559 THREAD); 2560 return nullptr; 2561 } 2562 method_parameters_seen = true; 2563 method_parameters_length = cfs->get_u1_fast(); 2564 const u4 real_length = (method_parameters_length * 4u) + 1u; 2565 if (method_attribute_length != real_length) { 2566 classfile_parse_error( 2567 "Invalid MethodParameters method attribute length %u in class file", 2568 method_attribute_length, THREAD); 2569 return nullptr; 2570 } 2571 method_parameters_data = cfs->current(); 2572 cfs->skip_u2_fast(method_parameters_length); 2573 cfs->skip_u2_fast(method_parameters_length); 2574 // ignore this attribute if it cannot be reflected 2575 if (!vmClasses::reflect_Parameter_klass_is_loaded()) 2576 method_parameters_length = -1; 2577 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2578 if (method_attribute_length != 0) { 2579 classfile_parse_error( 2580 "Invalid Synthetic method attribute length %u in class file %s", 2581 method_attribute_length, THREAD); 2582 return nullptr; 2583 } 2584 // Should we check that there hasn't already been a synthetic attribute? 2585 access_flags.set_is_synthetic(); 2586 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2587 if (method_attribute_length != 0) { 2588 classfile_parse_error( 2589 "Invalid Deprecated method attribute length %u in class file %s", 2590 method_attribute_length, THREAD); 2591 return nullptr; 2592 } 2593 } else if (_major_version >= JAVA_1_5_VERSION) { 2594 if (method_attribute_name == vmSymbols::tag_signature()) { 2595 if (generic_signature_index != 0) { 2596 classfile_parse_error( 2597 "Multiple Signature attributes for method in class file %s", 2598 THREAD); 2599 return nullptr; 2600 } 2601 if (method_attribute_length != 2) { 2602 classfile_parse_error( 2603 "Invalid Signature attribute length %u in class file %s", 2604 method_attribute_length, THREAD); 2605 return nullptr; 2606 } 2607 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2608 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2609 if (runtime_visible_annotations != nullptr) { 2610 classfile_parse_error( 2611 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2612 THREAD); 2613 return nullptr; 2614 } 2615 runtime_visible_annotations_length = method_attribute_length; 2616 runtime_visible_annotations = cfs->current(); 2617 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 2618 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2619 parse_annotations(cp, 2620 runtime_visible_annotations, 2621 runtime_visible_annotations_length, 2622 &parsed_annotations, 2623 _loader_data, 2624 _can_access_vm_annotations); 2625 cfs->skip_u1_fast(runtime_visible_annotations_length); 2626 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2627 if (runtime_invisible_annotations_exists) { 2628 classfile_parse_error( 2629 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2630 THREAD); 2631 return nullptr; 2632 } 2633 runtime_invisible_annotations_exists = true; 2634 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2635 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2636 if (runtime_visible_parameter_annotations != nullptr) { 2637 classfile_parse_error( 2638 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2639 THREAD); 2640 return nullptr; 2641 } 2642 runtime_visible_parameter_annotations_length = method_attribute_length; 2643 runtime_visible_parameter_annotations = cfs->current(); 2644 assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations"); 2645 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2646 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2647 if (runtime_invisible_parameter_annotations_exists) { 2648 classfile_parse_error( 2649 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2650 THREAD); 2651 return nullptr; 2652 } 2653 runtime_invisible_parameter_annotations_exists = true; 2654 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2655 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2656 if (annotation_default != nullptr) { 2657 classfile_parse_error( 2658 "Multiple AnnotationDefault attributes for method in class file %s", 2659 THREAD); 2660 return nullptr; 2661 } 2662 annotation_default_length = method_attribute_length; 2663 annotation_default = cfs->current(); 2664 assert(annotation_default != nullptr, "null annotation default"); 2665 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2666 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2667 if (runtime_visible_type_annotations != nullptr) { 2668 classfile_parse_error( 2669 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2670 THREAD); 2671 return nullptr; 2672 } 2673 runtime_visible_type_annotations_length = method_attribute_length; 2674 runtime_visible_type_annotations = cfs->current(); 2675 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 2676 // No need for the VM to parse Type annotations 2677 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2678 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2679 if (runtime_invisible_type_annotations_exists) { 2680 classfile_parse_error( 2681 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2682 THREAD); 2683 return nullptr; 2684 } 2685 runtime_invisible_type_annotations_exists = true; 2686 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2687 } else { 2688 // Skip unknown attributes 2689 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2690 } 2691 } else { 2692 // Skip unknown attributes 2693 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2694 } 2695 } 2696 2697 if (linenumber_table != nullptr) { 2698 linenumber_table->write_terminator(); 2699 linenumber_table_length = linenumber_table->position(); 2700 } 2701 2702 // Make sure there's at least one Code attribute in non-native/non-abstract method 2703 if (_need_verify) { 2704 guarantee_property(access_flags.is_native() || 2705 access_flags.is_abstract() || 2706 parsed_code_attribute, 2707 "Absent Code attribute in method that is not native or abstract in class file %s", 2708 CHECK_NULL); 2709 } 2710 2711 // All sizing information for a Method* is finally available, now create it 2712 InlineTableSizes sizes( 2713 total_lvt_length, 2714 linenumber_table_length, 2715 exception_table_length, 2716 checked_exceptions_length, 2717 method_parameters_length, 2718 generic_signature_index, 2719 runtime_visible_annotations_length, 2720 runtime_visible_parameter_annotations_length, 2721 runtime_visible_type_annotations_length, 2722 annotation_default_length, 2723 0); 2724 2725 Method* const m = Method::allocate(_loader_data, 2726 code_length, 2727 access_flags, 2728 &sizes, 2729 ConstMethod::NORMAL, 2730 _cp->symbol_at(name_index), 2731 CHECK_NULL); 2732 2733 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2734 2735 // Fill in information from fixed part (access_flags already set) 2736 m->set_constants(_cp); 2737 m->set_name_index(name_index); 2738 m->set_signature_index(signature_index); 2739 m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static()); 2740 assert(args_size < 0 || args_size == m->size_of_parameters(), ""); 2741 2742 // Fill in code attribute information 2743 m->set_max_stack(max_stack); 2744 m->set_max_locals(max_locals); 2745 if (stackmap_data != nullptr) { 2746 m->constMethod()->copy_stackmap_data(_loader_data, 2747 (u1*)stackmap_data, 2748 stackmap_data_length, 2749 CHECK_NULL); 2750 } 2751 2752 // Copy byte codes 2753 m->set_code((u1*)code_start); 2754 2755 // Copy line number table 2756 if (linenumber_table != nullptr) { 2757 memcpy(m->compressed_linenumber_table(), 2758 linenumber_table->buffer(), 2759 linenumber_table_length); 2760 } 2761 2762 // Copy exception table 2763 if (exception_table_length > 0) { 2764 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2765 m->exception_table_start(), 2766 exception_table_length * sizeof(ExceptionTableElement), 2767 sizeof(u2)); 2768 } 2769 2770 // Copy method parameters 2771 if (method_parameters_length > 0) { 2772 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2773 for (int i = 0; i < method_parameters_length; i++) { 2774 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2775 method_parameters_data += 2; 2776 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2777 method_parameters_data += 2; 2778 } 2779 } 2780 2781 // Copy checked exceptions 2782 if (checked_exceptions_length > 0) { 2783 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2784 m->checked_exceptions_start(), 2785 checked_exceptions_length * sizeof(CheckedExceptionElement), 2786 sizeof(u2)); 2787 } 2788 2789 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2790 if (total_lvt_length > 0) { 2791 *has_localvariable_table = true; 2792 copy_localvariable_table(m->constMethod(), 2793 lvt_cnt, 2794 localvariable_table_length, 2795 localvariable_table_start, 2796 lvtt_cnt, 2797 localvariable_type_table_length, 2798 localvariable_type_table_start, 2799 CHECK_NULL); 2800 } 2801 2802 if (parsed_annotations.has_any_annotations()) 2803 parsed_annotations.apply_to(methodHandle(THREAD, m)); 2804 2805 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'. 2806 m->set_is_hidden(); 2807 } 2808 if (parsed_annotations.has_aot_runtime_setup()) { 2809 if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() || 2810 !access_flags.is_private() || !access_flags.is_static()) { 2811 classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL); 2812 } 2813 _has_aot_runtime_setup_method = true; 2814 } 2815 2816 // Copy annotations 2817 copy_method_annotations(m->constMethod(), 2818 runtime_visible_annotations, 2819 runtime_visible_annotations_length, 2820 runtime_visible_parameter_annotations, 2821 runtime_visible_parameter_annotations_length, 2822 runtime_visible_type_annotations, 2823 runtime_visible_type_annotations_length, 2824 annotation_default, 2825 annotation_default_length, 2826 CHECK_NULL); 2827 2828 if (InstanceKlass::is_finalization_enabled() && 2829 name == vmSymbols::finalize_method_name() && 2830 signature == vmSymbols::void_method_signature() && 2831 is_identity_class) { 2832 if (m->is_empty_method()) { 2833 _has_empty_finalizer = true; 2834 } else { 2835 _has_finalizer = true; 2836 } 2837 } 2838 2839 NOT_PRODUCT(m->verify()); 2840 return m; 2841 } 2842 2843 2844 // Side-effects: populates the _methods field in the parser 2845 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2846 bool is_interface, 2847 bool* const has_localvariable_table, 2848 bool* has_final_method, 2849 bool* declares_nonstatic_concrete_methods, 2850 TRAPS) { 2851 assert(cfs != nullptr, "invariant"); 2852 assert(has_localvariable_table != nullptr, "invariant"); 2853 assert(has_final_method != nullptr, "invariant"); 2854 assert(declares_nonstatic_concrete_methods != nullptr, "invariant"); 2855 2856 assert(nullptr == _methods, "invariant"); 2857 2858 cfs->guarantee_more(2, CHECK); // length 2859 const u2 length = cfs->get_u2_fast(); 2860 if (length == 0) { 2861 _methods = Universe::the_empty_method_array(); 2862 } else { 2863 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2864 length, 2865 nullptr, 2866 CHECK); 2867 2868 for (int index = 0; index < length; index++) { 2869 Method* method = parse_method(cfs, 2870 is_interface, 2871 is_identity_class(), 2872 _cp, 2873 has_localvariable_table, 2874 CHECK); 2875 2876 if (method->is_final()) { 2877 *has_final_method = true; 2878 } 2879 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2880 // used for interface initialization, and default method inheritance analysis 2881 if (is_interface && !(*declares_nonstatic_concrete_methods) 2882 && !method->is_abstract() && !method->is_static()) { 2883 *declares_nonstatic_concrete_methods = true; 2884 } 2885 _methods->at_put(index, method); 2886 } 2887 2888 if (_need_verify && length > 1) { 2889 // Check duplicated methods 2890 ResourceMark rm(THREAD); 2891 // Set containing name-signature pairs 2892 NameSigHashtable* names_and_sigs = new NameSigHashtable(); 2893 for (int i = 0; i < length; i++) { 2894 const Method* const m = _methods->at(i); 2895 NameSigHash name_and_sig(m->name(), m->signature()); 2896 // If no duplicates, add name/signature in hashtable names_and_sigs. 2897 if(!names_and_sigs->put(name_and_sig, 0)) { 2898 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2899 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); 2900 return; 2901 } 2902 } 2903 } 2904 } 2905 } 2906 2907 static const intArray* sort_methods(Array<Method*>* methods) { 2908 const int length = methods->length(); 2909 // If JVMTI original method ordering or sharing is enabled we have to 2910 // remember the original class file ordering. 2911 // We temporarily use the vtable_index field in the Method* to store the 2912 // class file index, so we can read in after calling qsort. 2913 // Put the method ordering in the shared archive. 2914 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { 2915 for (int index = 0; index < length; index++) { 2916 Method* const m = methods->at(index); 2917 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2918 m->set_vtable_index(index); 2919 } 2920 } 2921 // Sort method array by ascending method name (for faster lookups & vtable construction) 2922 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2923 Method::sort_methods(methods); 2924 2925 intArray* method_ordering = nullptr; 2926 // If JVMTI original method ordering or sharing is enabled construct int 2927 // array remembering the original ordering 2928 if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { 2929 method_ordering = new intArray(length, length, -1); 2930 for (int index = 0; index < length; index++) { 2931 Method* const m = methods->at(index); 2932 const int old_index = m->vtable_index(); 2933 assert(old_index >= 0 && old_index < length, "invalid method index"); 2934 method_ordering->at_put(index, old_index); 2935 m->set_vtable_index(Method::invalid_vtable_index); 2936 } 2937 } 2938 return method_ordering; 2939 } 2940 2941 // Parse generic_signature attribute for methods and fields 2942 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 2943 TRAPS) { 2944 assert(cfs != nullptr, "invariant"); 2945 2946 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2947 const u2 generic_signature_index = cfs->get_u2_fast(); 2948 guarantee_property( 2949 valid_symbol_at(generic_signature_index), 2950 "Invalid Signature attribute at constant pool index %u in class file %s", 2951 generic_signature_index, CHECK_0); 2952 return generic_signature_index; 2953 } 2954 2955 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 2956 TRAPS) { 2957 2958 assert(cfs != nullptr, "invariant"); 2959 2960 cfs->guarantee_more(2, CHECK); // sourcefile_index 2961 const u2 sourcefile_index = cfs->get_u2_fast(); 2962 guarantee_property( 2963 valid_symbol_at(sourcefile_index), 2964 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2965 sourcefile_index, CHECK); 2966 set_class_sourcefile_index(sourcefile_index); 2967 } 2968 2969 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 2970 int length, 2971 TRAPS) { 2972 assert(cfs != nullptr, "invariant"); 2973 2974 const u1* const sde_buffer = cfs->current(); 2975 assert(sde_buffer != nullptr, "null sde buffer"); 2976 2977 // Don't bother storing it if there is no way to retrieve it 2978 if (JvmtiExport::can_get_source_debug_extension()) { 2979 assert((length+1) > length, "Overflow checking"); 2980 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2981 for (int i = 0; i < length; i++) { 2982 sde[i] = sde_buffer[i]; 2983 } 2984 sde[length] = '\0'; 2985 set_class_sde_buffer((const char*)sde, length); 2986 } 2987 // Got utf8 string, set stream position forward 2988 cfs->skip_u1(length, CHECK); 2989 } 2990 2991 2992 // Inner classes can be static, private or protected (classic VM does this) 2993 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 2994 JVM_ACC_PRIVATE | \ 2995 JVM_ACC_PROTECTED | \ 2996 JVM_ACC_STATIC \ 2997 ) 2998 2999 // Find index of the InnerClasses entry for the specified inner_class_info_index. 3000 // Return -1 if none is found. 3001 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 3002 Symbol* cp_klass_name = cp->klass_name_at(inner); 3003 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 3004 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 3005 if (cp->klass_name_at(idx_inner) == cp_klass_name) { 3006 return idx; 3007 } 3008 } 3009 return -1; 3010 } 3011 3012 // Return the outer_class_info_index for the InnerClasses entry containing the 3013 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found. 3014 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 3015 if (inner == 0) return -1; 3016 int idx = inner_classes_find_index(inner_classes, inner, cp, length); 3017 if (idx == -1) return -1; 3018 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3019 return result; 3020 } 3021 3022 // Return true if circularity is found, false if no circularity is found. 3023 // Use Floyd's cycle finding algorithm. 3024 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) { 3025 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 3026 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3027 3028 while (fast != -1 && fast != 0) { 3029 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) { 3030 return true; // found a circularity 3031 } 3032 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3033 if (fast == -1) return false; 3034 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3035 if (fast == -1) return false; 3036 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length); 3037 assert(slow != -1, "sanity check"); 3038 } 3039 return false; 3040 } 3041 3042 // Loop through each InnerClasses entry checking for circularities and duplications 3043 // with other entries. If duplicate entries are found then throw CFE. Otherwise, 3044 // return true if a circularity or entries with duplicate inner_class_info_indexes 3045 // are found. 3046 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) { 3047 // Loop through each InnerClasses entry. 3048 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 3049 // Return true if there are circular entries. 3050 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) { 3051 return true; 3052 } 3053 // Check if there are duplicate entries or entries with the same inner_class_info_index. 3054 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length; 3055 y += InstanceKlass::inner_class_next_offset) { 3056 3057 // 4347400: make sure there's no duplicate entry in the classes array 3058 if (_major_version >= JAVA_1_5_VERSION) { 3059 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) || 3060 _inner_classes->at(idx+1) != _inner_classes->at(y+1) || 3061 _inner_classes->at(idx+2) != _inner_classes->at(y+2) || 3062 _inner_classes->at(idx+3) != _inner_classes->at(y+3)), 3063 "Duplicate entry in InnerClasses attribute in class file %s", 3064 CHECK_(true)); 3065 } 3066 // Return true if there are two entries with the same inner_class_info_index. 3067 if (_inner_classes->at(y) == _inner_classes->at(idx)) { 3068 return true; 3069 } 3070 } 3071 } 3072 return false; 3073 } 3074 3075 // Return number of classes in the inner classes attribute table 3076 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3077 const ConstantPool* cp, 3078 const u1* const inner_classes_attribute_start, 3079 bool parsed_enclosingmethod_attribute, 3080 u2 enclosing_method_class_index, 3081 u2 enclosing_method_method_index, 3082 TRAPS) { 3083 const u1* const current_mark = cfs->current(); 3084 u2 length = 0; 3085 if (inner_classes_attribute_start != nullptr) { 3086 cfs->set_current(inner_classes_attribute_start); 3087 cfs->guarantee_more(2, CHECK_0); // length 3088 length = cfs->get_u2_fast(); 3089 } 3090 3091 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3092 // method data: 3093 // [inner_class_info_index, 3094 // outer_class_info_index, 3095 // inner_name_index, 3096 // inner_class_access_flags, 3097 // ... 3098 // enclosing_method_class_index, 3099 // enclosing_method_method_index] 3100 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3101 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3102 _inner_classes = inner_classes; 3103 3104 int index = 0; 3105 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3106 for (int n = 0; n < length; n++) { 3107 // Inner class index 3108 const u2 inner_class_info_index = cfs->get_u2_fast(); 3109 guarantee_property( 3110 valid_klass_reference_at(inner_class_info_index), 3111 "inner_class_info_index %u has bad constant type in class file %s", 3112 inner_class_info_index, CHECK_0); 3113 // Outer class index 3114 const u2 outer_class_info_index = cfs->get_u2_fast(); 3115 guarantee_property( 3116 outer_class_info_index == 0 || 3117 valid_klass_reference_at(outer_class_info_index), 3118 "outer_class_info_index %u has bad constant type in class file %s", 3119 outer_class_info_index, CHECK_0); 3120 3121 if (outer_class_info_index != 0) { 3122 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index); 3123 char* bytes = (char*)outer_class_name->bytes(); 3124 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY, 3125 "Outer class is an array class in class file %s", CHECK_0); 3126 } 3127 // Inner class name 3128 const u2 inner_name_index = cfs->get_u2_fast(); 3129 guarantee_property( 3130 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3131 "inner_name_index %u has bad constant type in class file %s", 3132 inner_name_index, CHECK_0); 3133 if (_need_verify) { 3134 guarantee_property(inner_class_info_index != outer_class_info_index, 3135 "Class is both outer and inner class in class file %s", CHECK_0); 3136 } 3137 3138 // Access flags 3139 u2 flags; 3140 // JVM_ACC_MODULE is defined in JDK-9 and later. 3141 if (_major_version >= JAVA_9_VERSION) { 3142 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3143 } else { 3144 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3145 } 3146 3147 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3148 // Set abstract bit for old class files for backward compatibility 3149 flags |= JVM_ACC_ABSTRACT; 3150 } 3151 3152 if (!supports_inline_types()) { 3153 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 3154 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 3155 if (!is_module && !is_interface) { 3156 flags |= JVM_ACC_IDENTITY; 3157 } 3158 } 3159 3160 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index); 3161 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0); 3162 AccessFlags inner_access_flags(flags); 3163 3164 inner_classes->at_put(index++, inner_class_info_index); 3165 inner_classes->at_put(index++, outer_class_info_index); 3166 inner_classes->at_put(index++, inner_name_index); 3167 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short()); 3168 } 3169 3170 // Check for circular and duplicate entries. 3171 bool has_circularity = false; 3172 if (_need_verify) { 3173 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0); 3174 if (has_circularity) { 3175 // If circularity check failed then ignore InnerClasses attribute. 3176 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 3177 index = 0; 3178 if (parsed_enclosingmethod_attribute) { 3179 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0); 3180 _inner_classes = inner_classes; 3181 } else { 3182 _inner_classes = Universe::the_empty_short_array(); 3183 } 3184 } 3185 } 3186 // Set EnclosingMethod class and method indexes. 3187 if (parsed_enclosingmethod_attribute) { 3188 inner_classes->at_put(index++, enclosing_method_class_index); 3189 inner_classes->at_put(index++, enclosing_method_method_index); 3190 } 3191 assert(index == size || has_circularity, "wrong size"); 3192 3193 // Restore buffer's current position. 3194 cfs->set_current(current_mark); 3195 3196 return length; 3197 } 3198 3199 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3200 const u1* const nest_members_attribute_start, 3201 TRAPS) { 3202 const u1* const current_mark = cfs->current(); 3203 u2 length = 0; 3204 if (nest_members_attribute_start != nullptr) { 3205 cfs->set_current(nest_members_attribute_start); 3206 cfs->guarantee_more(2, CHECK_0); // length 3207 length = cfs->get_u2_fast(); 3208 } 3209 const int size = length; 3210 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3211 _nest_members = nest_members; 3212 3213 int index = 0; 3214 cfs->guarantee_more(2 * length, CHECK_0); 3215 for (int n = 0; n < length; n++) { 3216 const u2 class_info_index = cfs->get_u2_fast(); 3217 guarantee_property( 3218 valid_klass_reference_at(class_info_index), 3219 "Nest member class_info_index %u has bad constant type in class file %s", 3220 class_info_index, CHECK_0); 3221 nest_members->at_put(index++, class_info_index); 3222 } 3223 assert(index == size, "wrong size"); 3224 3225 // Restore buffer's current position. 3226 cfs->set_current(current_mark); 3227 3228 return length; 3229 } 3230 3231 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs, 3232 const u1* const permitted_subclasses_attribute_start, 3233 TRAPS) { 3234 const u1* const current_mark = cfs->current(); 3235 u2 length = 0; 3236 if (permitted_subclasses_attribute_start != nullptr) { 3237 cfs->set_current(permitted_subclasses_attribute_start); 3238 cfs->guarantee_more(2, CHECK_0); // length 3239 length = cfs->get_u2_fast(); 3240 } 3241 const int size = length; 3242 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3243 _permitted_subclasses = permitted_subclasses; 3244 3245 if (length > 0) { 3246 int index = 0; 3247 cfs->guarantee_more(2 * length, CHECK_0); 3248 for (int n = 0; n < length; n++) { 3249 const u2 class_info_index = cfs->get_u2_fast(); 3250 guarantee_property( 3251 valid_klass_reference_at(class_info_index), 3252 "Permitted subclass class_info_index %u has bad constant type in class file %s", 3253 class_info_index, CHECK_0); 3254 permitted_subclasses->at_put(index++, class_info_index); 3255 } 3256 assert(index == size, "wrong size"); 3257 } 3258 3259 // Restore buffer's current position. 3260 cfs->set_current(current_mark); 3261 3262 return length; 3263 } 3264 3265 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs, 3266 const u1* const loadable_descriptors_attribute_start, 3267 TRAPS) { 3268 const u1* const current_mark = cfs->current(); 3269 u2 length = 0; 3270 if (loadable_descriptors_attribute_start != nullptr) { 3271 cfs->set_current(loadable_descriptors_attribute_start); 3272 cfs->guarantee_more(2, CHECK_0); // length 3273 length = cfs->get_u2_fast(); 3274 } 3275 const int size = length; 3276 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3277 _loadable_descriptors = loadable_descriptors; 3278 if (length > 0) { 3279 int index = 0; 3280 cfs->guarantee_more(2 * length, CHECK_0); 3281 for (int n = 0; n < length; n++) { 3282 const u2 descriptor_index = cfs->get_u2_fast(); 3283 guarantee_property( 3284 valid_symbol_at(descriptor_index), 3285 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s", 3286 descriptor_index, CHECK_0); 3287 Symbol* descriptor = _cp->symbol_at(descriptor_index); 3288 bool valid = legal_field_signature(descriptor, CHECK_0); 3289 if (!valid) { 3290 ResourceMark rm(THREAD); 3291 Exceptions::fthrow(THREAD_AND_LOCATION, 3292 vmSymbols::java_lang_ClassFormatError(), 3293 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"", 3294 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string()); 3295 return 0; 3296 } 3297 loadable_descriptors->at_put(index++, descriptor_index); 3298 } 3299 assert(index == size, "wrong size"); 3300 } 3301 3302 // Restore buffer's current position. 3303 cfs->set_current(current_mark); 3304 3305 return length; 3306 } 3307 3308 // Record { 3309 // u2 attribute_name_index; 3310 // u4 attribute_length; 3311 // u2 components_count; 3312 // component_info components[components_count]; 3313 // } 3314 // component_info { 3315 // u2 name_index; 3316 // u2 descriptor_index 3317 // u2 attributes_count; 3318 // attribute_info_attributes[attributes_count]; 3319 // } 3320 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, 3321 const ConstantPool* cp, 3322 const u1* const record_attribute_start, 3323 TRAPS) { 3324 const u1* const current_mark = cfs->current(); 3325 int components_count = 0; 3326 unsigned int calculate_attr_size = 0; 3327 if (record_attribute_start != nullptr) { 3328 cfs->set_current(record_attribute_start); 3329 cfs->guarantee_more(2, CHECK_0); // num of components 3330 components_count = (int)cfs->get_u2_fast(); 3331 calculate_attr_size = 2; 3332 } 3333 3334 Array<RecordComponent*>* const record_components = 3335 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0); 3336 _record_components = record_components; 3337 3338 for (int x = 0; x < components_count; x++) { 3339 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count 3340 3341 const u2 name_index = cfs->get_u2_fast(); 3342 guarantee_property(valid_symbol_at(name_index), 3343 "Invalid constant pool index %u for name in Record attribute in class file %s", 3344 name_index, CHECK_0); 3345 const Symbol* const name = cp->symbol_at(name_index); 3346 verify_legal_field_name(name, CHECK_0); 3347 3348 const u2 descriptor_index = cfs->get_u2_fast(); 3349 guarantee_property(valid_symbol_at(descriptor_index), 3350 "Invalid constant pool index %u for descriptor in Record attribute in class file %s", 3351 descriptor_index, CHECK_0); 3352 const Symbol* const descr = cp->symbol_at(descriptor_index); 3353 verify_legal_field_signature(name, descr, CHECK_0); 3354 3355 const u2 attributes_count = cfs->get_u2_fast(); 3356 calculate_attr_size += 6; 3357 u2 generic_sig_index = 0; 3358 const u1* runtime_visible_annotations = nullptr; 3359 int runtime_visible_annotations_length = 0; 3360 bool runtime_invisible_annotations_exists = false; 3361 const u1* runtime_visible_type_annotations = nullptr; 3362 int runtime_visible_type_annotations_length = 0; 3363 bool runtime_invisible_type_annotations_exists = false; 3364 3365 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, 3366 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. 3367 for (int y = 0; y < attributes_count; y++) { 3368 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length 3369 const u2 attribute_name_index = cfs->get_u2_fast(); 3370 const u4 attribute_length = cfs->get_u4_fast(); 3371 calculate_attr_size += 6; 3372 guarantee_property( 3373 valid_symbol_at(attribute_name_index), 3374 "Invalid Record attribute name index %u in class file %s", 3375 attribute_name_index, CHECK_0); 3376 3377 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 3378 if (attribute_name == vmSymbols::tag_signature()) { 3379 if (generic_sig_index != 0) { 3380 classfile_parse_error( 3381 "Multiple Signature attributes for Record component in class file %s", 3382 THREAD); 3383 return 0; 3384 } 3385 if (attribute_length != 2) { 3386 classfile_parse_error( 3387 "Invalid Signature attribute length %u in Record component in class file %s", 3388 attribute_length, THREAD); 3389 return 0; 3390 } 3391 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); 3392 3393 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 3394 if (runtime_visible_annotations != nullptr) { 3395 classfile_parse_error( 3396 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD); 3397 return 0; 3398 } 3399 runtime_visible_annotations_length = attribute_length; 3400 runtime_visible_annotations = cfs->current(); 3401 3402 assert(runtime_visible_annotations != nullptr, "null record component visible annotation"); 3403 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); 3404 cfs->skip_u1_fast(runtime_visible_annotations_length); 3405 3406 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 3407 if (runtime_invisible_annotations_exists) { 3408 classfile_parse_error( 3409 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD); 3410 return 0; 3411 } 3412 runtime_invisible_annotations_exists = true; 3413 cfs->skip_u1(attribute_length, CHECK_0); 3414 3415 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 3416 if (runtime_visible_type_annotations != nullptr) { 3417 classfile_parse_error( 3418 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3419 return 0; 3420 } 3421 runtime_visible_type_annotations_length = attribute_length; 3422 runtime_visible_type_annotations = cfs->current(); 3423 3424 assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation"); 3425 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); 3426 cfs->skip_u1_fast(runtime_visible_type_annotations_length); 3427 3428 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 3429 if (runtime_invisible_type_annotations_exists) { 3430 classfile_parse_error( 3431 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3432 return 0; 3433 } 3434 runtime_invisible_type_annotations_exists = true; 3435 cfs->skip_u1(attribute_length, CHECK_0); 3436 3437 } else { 3438 // Skip unknown attributes 3439 cfs->skip_u1(attribute_length, CHECK_0); 3440 } 3441 calculate_attr_size += attribute_length; 3442 } // End of attributes For loop 3443 3444 AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations, 3445 runtime_visible_annotations_length, 3446 CHECK_0); 3447 AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations, 3448 runtime_visible_type_annotations_length, 3449 CHECK_0); 3450 3451 RecordComponent* record_component = 3452 RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index, 3453 annotations, type_annotations, CHECK_0); 3454 record_components->at_put(x, record_component); 3455 } // End of component processing loop 3456 3457 // Restore buffer's current position. 3458 cfs->set_current(current_mark); 3459 return calculate_attr_size; 3460 } 3461 3462 void ClassFileParser::parse_classfile_synthetic_attribute() { 3463 set_class_synthetic_flag(true); 3464 } 3465 3466 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3467 assert(cfs != nullptr, "invariant"); 3468 3469 const u2 signature_index = cfs->get_u2(CHECK); 3470 guarantee_property( 3471 valid_symbol_at(signature_index), 3472 "Invalid constant pool index %u in Signature attribute in class file %s", 3473 signature_index, CHECK); 3474 set_class_generic_signature_index(signature_index); 3475 } 3476 3477 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3478 ConstantPool* cp, 3479 u4 attribute_byte_length, 3480 TRAPS) { 3481 assert(cfs != nullptr, "invariant"); 3482 assert(cp != nullptr, "invariant"); 3483 const int cp_size = cp->length(); 3484 3485 const u1* const current_before_parsing = cfs->current(); 3486 3487 guarantee_property(attribute_byte_length >= sizeof(u2), 3488 "Invalid BootstrapMethods attribute length %u in class file %s", 3489 attribute_byte_length, 3490 CHECK); 3491 3492 cfs->guarantee_more(attribute_byte_length, CHECK); 3493 3494 const int num_bootstrap_methods = cfs->get_u2_fast(); 3495 3496 guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods, 3497 "Short length on BootstrapMethods in class file %s", 3498 CHECK); 3499 3500 const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3501 3502 // Eagerly assign the arrays so that they will be deallocated with the constant 3503 // pool if there is an error. 3504 BSMAttributeEntries::InsertionIterator iter = 3505 cp->bsm_entries().start_extension(num_bootstrap_methods, 3506 bootstrap_methods_u2_len, 3507 _loader_data, 3508 CHECK); 3509 3510 for (int i = 0; i < num_bootstrap_methods; i++) { 3511 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3512 u2 bootstrap_method_ref = cfs->get_u2_fast(); 3513 u2 num_bootstrap_arguments = cfs->get_u2_fast(); 3514 guarantee_property( 3515 valid_cp_range(bootstrap_method_ref, cp_size) && 3516 cp->tag_at(bootstrap_method_ref).is_method_handle(), 3517 "bootstrap_method_index %u has bad constant type in class file %s", 3518 bootstrap_method_ref, 3519 CHECK); 3520 cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc] 3521 3522 BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments); 3523 guarantee_property(entry != nullptr, 3524 "Invalid BootstrapMethods num_bootstrap_methods." 3525 " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK); 3526 3527 for (int argi = 0; argi < num_bootstrap_arguments; argi++) { 3528 const u2 argument_index = cfs->get_u2_fast(); 3529 guarantee_property( 3530 valid_cp_range(argument_index, cp_size) && 3531 cp->tag_at(argument_index).is_loadable_constant(), 3532 "argument_index %u has bad constant type in class file %s", 3533 argument_index, 3534 CHECK); 3535 entry->set_argument(argi, argument_index); 3536 } 3537 } 3538 cp->bsm_entries().end_extension(iter, _loader_data, CHECK); 3539 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(), 3540 "Bad length on BootstrapMethods in class file %s", 3541 CHECK); 3542 } 3543 3544 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3545 ConstantPool* cp, 3546 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3547 TRAPS) { 3548 assert(cfs != nullptr, "invariant"); 3549 assert(cp != nullptr, "invariant"); 3550 assert(parsed_annotations != nullptr, "invariant"); 3551 3552 // Set inner classes attribute to default sentinel 3553 _inner_classes = Universe::the_empty_short_array(); 3554 // Set nest members attribute to default sentinel 3555 _nest_members = Universe::the_empty_short_array(); 3556 // Set _permitted_subclasses attribute to default sentinel 3557 _permitted_subclasses = Universe::the_empty_short_array(); 3558 // Set _loadable_descriptors attribute to default sentinel 3559 _loadable_descriptors = Universe::the_empty_short_array(); 3560 cfs->guarantee_more(2, CHECK); // attributes_count 3561 u2 attributes_count = cfs->get_u2_fast(); 3562 bool parsed_sourcefile_attribute = false; 3563 bool parsed_innerclasses_attribute = false; 3564 bool parsed_nest_members_attribute = false; 3565 bool parsed_permitted_subclasses_attribute = false; 3566 bool parsed_loadable_descriptors_attribute = false; 3567 bool parsed_nest_host_attribute = false; 3568 bool parsed_record_attribute = false; 3569 bool parsed_enclosingmethod_attribute = false; 3570 bool parsed_bootstrap_methods_attribute = false; 3571 const u1* runtime_visible_annotations = nullptr; 3572 int runtime_visible_annotations_length = 0; 3573 const u1* runtime_visible_type_annotations = nullptr; 3574 int runtime_visible_type_annotations_length = 0; 3575 bool runtime_invisible_type_annotations_exists = false; 3576 bool runtime_invisible_annotations_exists = false; 3577 bool parsed_source_debug_ext_annotations_exist = false; 3578 const u1* inner_classes_attribute_start = nullptr; 3579 u4 inner_classes_attribute_length = 0; 3580 u2 enclosing_method_class_index = 0; 3581 u2 enclosing_method_method_index = 0; 3582 const u1* nest_members_attribute_start = nullptr; 3583 u4 nest_members_attribute_length = 0; 3584 const u1* record_attribute_start = nullptr; 3585 u4 record_attribute_length = 0; 3586 const u1* permitted_subclasses_attribute_start = nullptr; 3587 u4 permitted_subclasses_attribute_length = 0; 3588 const u1* loadable_descriptors_attribute_start = nullptr; 3589 u4 loadable_descriptors_attribute_length = 0; 3590 3591 // Iterate over attributes 3592 while (attributes_count--) { 3593 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3594 const u2 attribute_name_index = cfs->get_u2_fast(); 3595 const u4 attribute_length = cfs->get_u4_fast(); 3596 guarantee_property( 3597 valid_symbol_at(attribute_name_index), 3598 "Attribute name has bad constant pool index %u in class file %s", 3599 attribute_name_index, CHECK); 3600 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3601 if (tag == vmSymbols::tag_source_file()) { 3602 // Check for SourceFile tag 3603 if (_need_verify) { 3604 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3605 } 3606 if (parsed_sourcefile_attribute) { 3607 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD); 3608 return; 3609 } else { 3610 parsed_sourcefile_attribute = true; 3611 } 3612 parse_classfile_sourcefile_attribute(cfs, CHECK); 3613 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3614 // Check for SourceDebugExtension tag 3615 if (parsed_source_debug_ext_annotations_exist) { 3616 classfile_parse_error( 3617 "Multiple SourceDebugExtension attributes in class file %s", THREAD); 3618 return; 3619 } 3620 parsed_source_debug_ext_annotations_exist = true; 3621 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3622 } else if (tag == vmSymbols::tag_inner_classes()) { 3623 // Check for InnerClasses tag 3624 if (parsed_innerclasses_attribute) { 3625 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD); 3626 return; 3627 } else { 3628 parsed_innerclasses_attribute = true; 3629 } 3630 inner_classes_attribute_start = cfs->current(); 3631 inner_classes_attribute_length = attribute_length; 3632 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3633 } else if (tag == vmSymbols::tag_synthetic()) { 3634 // Check for Synthetic tag 3635 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3636 if (attribute_length != 0) { 3637 classfile_parse_error( 3638 "Invalid Synthetic classfile attribute length %u in class file %s", 3639 attribute_length, THREAD); 3640 return; 3641 } 3642 parse_classfile_synthetic_attribute(); 3643 } else if (tag == vmSymbols::tag_deprecated()) { 3644 // Check for Deprecated tag - 4276120 3645 if (attribute_length != 0) { 3646 classfile_parse_error( 3647 "Invalid Deprecated classfile attribute length %u in class file %s", 3648 attribute_length, THREAD); 3649 return; 3650 } 3651 } else if (_major_version >= JAVA_1_5_VERSION) { 3652 if (tag == vmSymbols::tag_signature()) { 3653 if (_generic_signature_index != 0) { 3654 classfile_parse_error( 3655 "Multiple Signature attributes in class file %s", THREAD); 3656 return; 3657 } 3658 if (attribute_length != 2) { 3659 classfile_parse_error( 3660 "Wrong Signature attribute length %u in class file %s", 3661 attribute_length, THREAD); 3662 return; 3663 } 3664 parse_classfile_signature_attribute(cfs, CHECK); 3665 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3666 if (runtime_visible_annotations != nullptr) { 3667 classfile_parse_error( 3668 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD); 3669 return; 3670 } 3671 runtime_visible_annotations_length = attribute_length; 3672 runtime_visible_annotations = cfs->current(); 3673 assert(runtime_visible_annotations != nullptr, "null visible annotations"); 3674 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3675 parse_annotations(cp, 3676 runtime_visible_annotations, 3677 runtime_visible_annotations_length, 3678 parsed_annotations, 3679 _loader_data, 3680 _can_access_vm_annotations); 3681 cfs->skip_u1_fast(runtime_visible_annotations_length); 3682 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3683 if (runtime_invisible_annotations_exists) { 3684 classfile_parse_error( 3685 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD); 3686 return; 3687 } 3688 runtime_invisible_annotations_exists = true; 3689 cfs->skip_u1(attribute_length, CHECK); 3690 } else if (tag == vmSymbols::tag_enclosing_method()) { 3691 if (parsed_enclosingmethod_attribute) { 3692 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD); 3693 return; 3694 } else { 3695 parsed_enclosingmethod_attribute = true; 3696 } 3697 guarantee_property(attribute_length == 4, 3698 "Wrong EnclosingMethod attribute length %u in class file %s", 3699 attribute_length, CHECK); 3700 cfs->guarantee_more(4, CHECK); // class_index, method_index 3701 enclosing_method_class_index = cfs->get_u2_fast(); 3702 enclosing_method_method_index = cfs->get_u2_fast(); 3703 if (enclosing_method_class_index == 0) { 3704 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD); 3705 return; 3706 } 3707 // Validate the constant pool indices and types 3708 guarantee_property(valid_klass_reference_at(enclosing_method_class_index), 3709 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3710 if (enclosing_method_method_index != 0 && 3711 (!cp->is_within_bounds(enclosing_method_method_index) || 3712 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3713 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD); 3714 return; 3715 } 3716 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3717 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3718 if (parsed_bootstrap_methods_attribute) { 3719 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD); 3720 return; 3721 } 3722 parsed_bootstrap_methods_attribute = true; 3723 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3724 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3725 if (runtime_visible_type_annotations != nullptr) { 3726 classfile_parse_error( 3727 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD); 3728 return; 3729 } 3730 runtime_visible_type_annotations_length = attribute_length; 3731 runtime_visible_type_annotations = cfs->current(); 3732 assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); 3733 // No need for the VM to parse Type annotations 3734 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3735 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3736 if (runtime_invisible_type_annotations_exists) { 3737 classfile_parse_error( 3738 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD); 3739 return; 3740 } 3741 runtime_invisible_type_annotations_exists = true; 3742 cfs->skip_u1(attribute_length, CHECK); 3743 } else if (_major_version >= JAVA_11_VERSION) { 3744 if (tag == vmSymbols::tag_nest_members()) { 3745 // Check for NestMembers tag 3746 if (parsed_nest_members_attribute) { 3747 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD); 3748 return; 3749 } else { 3750 parsed_nest_members_attribute = true; 3751 } 3752 if (parsed_nest_host_attribute) { 3753 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD); 3754 return; 3755 } 3756 nest_members_attribute_start = cfs->current(); 3757 nest_members_attribute_length = attribute_length; 3758 cfs->skip_u1(nest_members_attribute_length, CHECK); 3759 } else if (tag == vmSymbols::tag_nest_host()) { 3760 if (parsed_nest_host_attribute) { 3761 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD); 3762 return; 3763 } else { 3764 parsed_nest_host_attribute = true; 3765 } 3766 if (parsed_nest_members_attribute) { 3767 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD); 3768 return; 3769 } 3770 if (_need_verify) { 3771 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3772 } 3773 cfs->guarantee_more(2, CHECK); 3774 u2 class_info_index = cfs->get_u2_fast(); 3775 guarantee_property( 3776 valid_klass_reference_at(class_info_index), 3777 "Nest-host class_info_index %u has bad constant type in class file %s", 3778 class_info_index, CHECK); 3779 _nest_host = class_info_index; 3780 3781 } else if (_major_version >= JAVA_16_VERSION) { 3782 if (tag == vmSymbols::tag_record()) { 3783 if (parsed_record_attribute) { 3784 classfile_parse_error("Multiple Record attributes in class file %s", THREAD); 3785 return; 3786 } 3787 parsed_record_attribute = true; 3788 record_attribute_start = cfs->current(); 3789 record_attribute_length = attribute_length; 3790 } else if (_major_version >= JAVA_17_VERSION) { 3791 if (tag == vmSymbols::tag_permitted_subclasses()) { 3792 if (parsed_permitted_subclasses_attribute) { 3793 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK); 3794 return; 3795 } 3796 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute. 3797 if (_access_flags.is_final()) { 3798 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK); 3799 return; 3800 } 3801 parsed_permitted_subclasses_attribute = true; 3802 permitted_subclasses_attribute_start = cfs->current(); 3803 permitted_subclasses_attribute_length = attribute_length; 3804 } 3805 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) { 3806 if (parsed_loadable_descriptors_attribute) { 3807 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK); 3808 return; 3809 } 3810 parsed_loadable_descriptors_attribute = true; 3811 loadable_descriptors_attribute_start = cfs->current(); 3812 loadable_descriptors_attribute_length = attribute_length; 3813 } 3814 } 3815 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION 3816 cfs->skip_u1(attribute_length, CHECK); 3817 } else { 3818 // Unknown attribute 3819 cfs->skip_u1(attribute_length, CHECK); 3820 } 3821 } else { 3822 // Unknown attribute 3823 cfs->skip_u1(attribute_length, CHECK); 3824 } 3825 } else { 3826 // Unknown attribute 3827 cfs->skip_u1(attribute_length, CHECK); 3828 } 3829 } 3830 _class_annotations = allocate_annotations(runtime_visible_annotations, 3831 runtime_visible_annotations_length, 3832 CHECK); 3833 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations, 3834 runtime_visible_type_annotations_length, 3835 CHECK); 3836 3837 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3838 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3839 cfs, 3840 cp, 3841 inner_classes_attribute_start, 3842 parsed_innerclasses_attribute, 3843 enclosing_method_class_index, 3844 enclosing_method_method_index, 3845 CHECK); 3846 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3847 guarantee_property( 3848 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3849 "Wrong InnerClasses attribute length in class file %s", CHECK); 3850 } 3851 } 3852 3853 if (parsed_nest_members_attribute) { 3854 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3855 cfs, 3856 nest_members_attribute_start, 3857 CHECK); 3858 if (_need_verify) { 3859 guarantee_property( 3860 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3861 "Wrong NestMembers attribute length in class file %s", CHECK); 3862 } 3863 } 3864 3865 if (parsed_record_attribute) { 3866 const unsigned int calculated_attr_length = parse_classfile_record_attribute( 3867 cfs, 3868 cp, 3869 record_attribute_start, 3870 CHECK); 3871 if (_need_verify) { 3872 guarantee_property(record_attribute_length == calculated_attr_length, 3873 "Record attribute has wrong length in class file %s", 3874 CHECK); 3875 } 3876 } 3877 3878 if (parsed_permitted_subclasses_attribute) { 3879 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute( 3880 cfs, 3881 permitted_subclasses_attribute_start, 3882 CHECK); 3883 if (_need_verify) { 3884 guarantee_property( 3885 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses, 3886 "Wrong PermittedSubclasses attribute length in class file %s", CHECK); 3887 } 3888 } 3889 3890 if (parsed_loadable_descriptors_attribute) { 3891 const u2 num_classes = parse_classfile_loadable_descriptors_attribute( 3892 cfs, 3893 loadable_descriptors_attribute_start, 3894 CHECK); 3895 if (_need_verify) { 3896 guarantee_property( 3897 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes, 3898 "Wrong LoadableDescriptors attribute length in class file %s", CHECK); 3899 } 3900 } 3901 3902 if (_max_bootstrap_specifier_index >= 0) { 3903 guarantee_property(parsed_bootstrap_methods_attribute, 3904 "Missing BootstrapMethods attribute in class file %s", CHECK); 3905 } 3906 } 3907 3908 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3909 assert(k != nullptr, "invariant"); 3910 3911 if (_synthetic_flag) 3912 k->set_is_synthetic(); 3913 if (_sourcefile_index != 0) { 3914 k->set_source_file_name_index(_sourcefile_index); 3915 } 3916 if (_generic_signature_index != 0) { 3917 k->set_generic_signature_index(_generic_signature_index); 3918 } 3919 if (_sde_buffer != nullptr) { 3920 k->set_source_debug_extension(_sde_buffer, _sde_length); 3921 } 3922 } 3923 3924 // Create the Annotations object that will 3925 // hold the annotations array for the Klass. 3926 void ClassFileParser::create_combined_annotations(TRAPS) { 3927 if (_class_annotations == nullptr && 3928 _class_type_annotations == nullptr && 3929 _fields_annotations == nullptr && 3930 _fields_type_annotations == nullptr) { 3931 // Don't create the Annotations object unnecessarily. 3932 return; 3933 } 3934 3935 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3936 annotations->set_class_annotations(_class_annotations); 3937 annotations->set_class_type_annotations(_class_type_annotations); 3938 annotations->set_fields_annotations(_fields_annotations); 3939 annotations->set_fields_type_annotations(_fields_type_annotations); 3940 3941 // This is the Annotations object that will be 3942 // assigned to InstanceKlass being constructed. 3943 _combined_annotations = annotations; 3944 3945 // The annotations arrays below has been transferred the 3946 // _combined_annotations so these fields can now be cleared. 3947 _class_annotations = nullptr; 3948 _class_type_annotations = nullptr; 3949 _fields_annotations = nullptr; 3950 _fields_type_annotations = nullptr; 3951 } 3952 3953 // Transfer ownership of metadata allocated to the InstanceKlass. 3954 void ClassFileParser::apply_parsed_class_metadata( 3955 InstanceKlass* this_klass, 3956 int java_fields_count) { 3957 assert(this_klass != nullptr, "invariant"); 3958 3959 _cp->set_pool_holder(this_klass); 3960 this_klass->set_constants(_cp); 3961 this_klass->set_fieldinfo_stream(_fieldinfo_stream); 3962 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table); 3963 this_klass->set_fields_status(_fields_status); 3964 this_klass->set_methods(_methods); 3965 this_klass->set_inner_classes(_inner_classes); 3966 this_klass->set_nest_members(_nest_members); 3967 this_klass->set_nest_host_index(_nest_host); 3968 this_klass->set_loadable_descriptors(_loadable_descriptors); 3969 this_klass->set_annotations(_combined_annotations); 3970 this_klass->set_permitted_subclasses(_permitted_subclasses); 3971 this_klass->set_record_components(_record_components); 3972 this_klass->set_inline_layout_info_array(_inline_layout_info_array); 3973 3974 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table)); 3975 3976 // Delay the setting of _local_interfaces and _transitive_interfaces until after 3977 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could 3978 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with 3979 // its _super. If an OOM occurs while loading the current klass, its _super field 3980 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3981 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3982 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3983 3984 // Clear out these fields so they don't get deallocated by the destructor 3985 clear_class_metadata(); 3986 } 3987 3988 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno, 3989 int anno_length, 3990 TRAPS) { 3991 AnnotationArray* annotations = nullptr; 3992 if (anno != nullptr) { 3993 annotations = MetadataFactory::new_array<u1>(_loader_data, 3994 anno_length, 3995 CHECK_(annotations)); 3996 for (int i = 0; i < anno_length; i++) { 3997 annotations->at_put(i, anno[i]); 3998 } 3999 } 4000 return annotations; 4001 } 4002 4003 void ClassFileParser::check_super_class(ConstantPool* const cp, 4004 const int super_class_index, 4005 const bool need_verify, 4006 TRAPS) { 4007 assert(cp != nullptr, "invariant"); 4008 4009 if (super_class_index == 0) { 4010 guarantee_property(_class_name == vmSymbols::java_lang_Object(), 4011 "Invalid superclass index 0 in class file %s", 4012 CHECK); 4013 } else { 4014 guarantee_property(valid_klass_reference_at(super_class_index), 4015 "Invalid superclass index %u in class file %s", 4016 super_class_index, 4017 CHECK); 4018 4019 // The class name should be legal because it is checked when parsing constant pool. 4020 // However, make sure it is not an array type. 4021 if (need_verify) { 4022 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY, 4023 "Bad superclass name in class file %s", CHECK); 4024 } 4025 } 4026 } 4027 4028 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) { 4029 _max_nonstatic_oop_maps = max_blocks; 4030 _nonstatic_oop_map_count = 0; 4031 if (max_blocks == 0) { 4032 _nonstatic_oop_maps = nullptr; 4033 } else { 4034 _nonstatic_oop_maps = 4035 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps); 4036 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); 4037 } 4038 } 4039 4040 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const { 4041 assert(_nonstatic_oop_map_count > 0, "Has no oop maps"); 4042 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1); 4043 } 4044 4045 // addition of super oop maps 4046 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { 4047 assert(nof_blocks && _nonstatic_oop_map_count == 0 && 4048 nof_blocks <= _max_nonstatic_oop_maps, "invariant"); 4049 4050 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); 4051 _nonstatic_oop_map_count += nof_blocks; 4052 } 4053 4054 // collection of oops 4055 void OopMapBlocksBuilder::add(int offset, int count) { 4056 if (_nonstatic_oop_map_count == 0) { 4057 _nonstatic_oop_map_count++; 4058 } 4059 OopMapBlock* nonstatic_oop_map = last_oop_map(); 4060 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up 4061 nonstatic_oop_map->set_offset(offset); 4062 nonstatic_oop_map->set_count(count); 4063 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add 4064 nonstatic_oop_map->increment_count(count); 4065 } else { // Need a new one... 4066 _nonstatic_oop_map_count++; 4067 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check"); 4068 nonstatic_oop_map = last_oop_map(); 4069 nonstatic_oop_map->set_offset(offset); 4070 nonstatic_oop_map->set_count(count); 4071 } 4072 } 4073 4074 // general purpose copy, e.g. into allocated instanceKlass 4075 void OopMapBlocksBuilder::copy(OopMapBlock* dst) { 4076 if (_nonstatic_oop_map_count != 0) { 4077 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count); 4078 } 4079 } 4080 4081 // Sort and compact adjacent blocks 4082 void OopMapBlocksBuilder::compact() { 4083 if (_nonstatic_oop_map_count <= 1) { 4084 return; 4085 } 4086 /* 4087 * Since field layout sneaks in oops before values, we will be able to condense 4088 * blocks. There is potential to compact between super, own refs and values 4089 * containing refs. 4090 * 4091 * Currently compaction is slightly limited due to values being 8 byte aligned. 4092 * This may well change: FixMe if it doesn't, the code below is fairly general purpose 4093 * and maybe it doesn't need to be. 4094 */ 4095 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock), 4096 (_sort_Fn)OopMapBlock::compare_offset); 4097 if (_nonstatic_oop_map_count < 2) { 4098 return; 4099 } 4100 4101 // Make a temp copy, and iterate through and copy back into the original 4102 ResourceMark rm; 4103 OopMapBlock* oop_maps_copy = 4104 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count); 4105 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count; 4106 copy(oop_maps_copy); 4107 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps; 4108 unsigned int new_count = 1; 4109 oop_maps_copy++; 4110 while(oop_maps_copy < oop_maps_copy_end) { 4111 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); 4112 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { 4113 nonstatic_oop_map->increment_count(oop_maps_copy->count()); 4114 } else { 4115 nonstatic_oop_map++; 4116 new_count++; 4117 nonstatic_oop_map->set_offset(oop_maps_copy->offset()); 4118 nonstatic_oop_map->set_count(oop_maps_copy->count()); 4119 } 4120 oop_maps_copy++; 4121 } 4122 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?"); 4123 _nonstatic_oop_map_count = new_count; 4124 } 4125 4126 void OopMapBlocksBuilder::print_on(outputStream* st) const { 4127 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps); 4128 if (_nonstatic_oop_map_count > 0) { 4129 OopMapBlock* map = _nonstatic_oop_maps; 4130 OopMapBlock* last_map = last_oop_map(); 4131 assert(map <= last_map, "Last less than first"); 4132 while (map <= last_map) { 4133 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), 4134 map->offset() + map->offset_span() - heapOopSize, map->count()); 4135 map++; 4136 } 4137 } 4138 } 4139 4140 void OopMapBlocksBuilder::print_value_on(outputStream* st) const { 4141 print_on(st); 4142 } 4143 4144 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4145 assert(ik != nullptr, "invariant"); 4146 4147 const InstanceKlass* const super = ik->super(); 4148 4149 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4150 // in which case we don't have to register objects as finalizable 4151 if (!_has_empty_finalizer) { 4152 if (_has_finalizer || 4153 (super != nullptr && super->has_finalizer())) { 4154 ik->set_has_finalizer(); 4155 } 4156 } 4157 4158 #ifdef ASSERT 4159 bool f = false; 4160 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4161 vmSymbols::void_method_signature()); 4162 if (InstanceKlass::is_finalization_enabled() && 4163 (m != nullptr) && !m->is_empty_method() && 4164 m->method_holder()->access_flags().is_identity_class()) { 4165 f = true; 4166 } 4167 4168 // Spec doesn't prevent agent from redefinition of empty finalizer. 4169 // Despite the fact that it's generally bad idea and redefined finalizer 4170 // will not work as expected we shouldn't abort vm in this case 4171 if (!ik->has_redefined_this_or_super()) { 4172 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4173 } 4174 #endif 4175 4176 // Check if this klass supports the java.lang.Cloneable interface 4177 if (vmClasses::Cloneable_klass_is_loaded()) { 4178 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) { 4179 ik->set_is_cloneable(); 4180 } 4181 } 4182 4183 // If it cannot be fast-path allocated, set a bit in the layout helper. 4184 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4185 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4186 if (ik->is_abstract() || ik->is_interface() 4187 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr) 4188 || ik->size_helper() >= FastAllocateSizeLimit) { 4189 // Forbid fast-path allocation. 4190 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4191 ik->set_layout_helper(lh); 4192 } 4193 4194 // Propagate the AOT runtimeSetup method discovery 4195 if (_has_aot_runtime_setup_method) { 4196 ik->set_is_runtime_setup_required(); 4197 if (log_is_enabled(Info, aot, init)) { 4198 ResourceMark rm; 4199 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name()); 4200 } 4201 } 4202 } 4203 4204 bool ClassFileParser::supports_inline_types() const { 4205 // Inline types are only supported by class file version 71.65535 and later 4206 return _major_version > JAVA_28_VERSION || 4207 (_major_version == JAVA_28_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION); 4208 } 4209 4210 // utility methods for appending an array with check for duplicates 4211 4212 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4213 const Array<InstanceKlass*>* const ifs) { 4214 // iterate over new interfaces 4215 for (int i = 0; i < ifs->length(); i++) { 4216 InstanceKlass* const e = ifs->at(i); 4217 assert(e->is_klass() && e->is_interface(), "just checking"); 4218 // add new interface 4219 result->append_if_missing(e); 4220 } 4221 } 4222 4223 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4224 Array<InstanceKlass*>* local_ifs, 4225 ClassLoaderData* loader_data, 4226 TRAPS) { 4227 assert(local_ifs != nullptr, "invariant"); 4228 assert(loader_data != nullptr, "invariant"); 4229 4230 // Compute maximum size for transitive interfaces 4231 int max_transitive_size = 0; 4232 int super_size = 0; 4233 // Add superclass transitive interfaces size 4234 if (super != nullptr) { 4235 super_size = super->transitive_interfaces()->length(); 4236 max_transitive_size += super_size; 4237 } 4238 // Add local interfaces' super interfaces 4239 const int local_size = local_ifs->length(); 4240 for (int i = 0; i < local_size; i++) { 4241 InstanceKlass* const l = local_ifs->at(i); 4242 max_transitive_size += l->transitive_interfaces()->length(); 4243 } 4244 // Finally add local interfaces 4245 max_transitive_size += local_size; 4246 // Construct array 4247 if (max_transitive_size == 0) { 4248 // no interfaces, use canonicalized array 4249 return Universe::the_empty_instance_klass_array(); 4250 } else if (max_transitive_size == super_size) { 4251 // no new local interfaces added, share superklass' transitive interface array 4252 return super->transitive_interfaces(); 4253 } else if (max_transitive_size == local_size) { 4254 // only local interfaces added, share local interface array 4255 return local_ifs; 4256 } else { 4257 ResourceMark rm; 4258 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4259 4260 // Copy down from superclass 4261 if (super != nullptr) { 4262 append_interfaces(result, super->transitive_interfaces()); 4263 } 4264 4265 // Copy down from local interfaces' superinterfaces 4266 for (int i = 0; i < local_size; i++) { 4267 InstanceKlass* const l = local_ifs->at(i); 4268 append_interfaces(result, l->transitive_interfaces()); 4269 } 4270 // Finally add local interfaces 4271 append_interfaces(result, local_ifs); 4272 4273 // length will be less than the max_transitive_size if duplicates were removed 4274 const int length = result->length(); 4275 assert(length <= max_transitive_size, "just checking"); 4276 Array<InstanceKlass*>* const new_result = 4277 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4278 for (int i = 0; i < length; i++) { 4279 InstanceKlass* const e = result->at(i); 4280 assert(e != nullptr, "just checking"); 4281 new_result->at_put(i, e); 4282 } 4283 return new_result; 4284 } 4285 } 4286 4287 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4288 assert(this_klass != nullptr, "invariant"); 4289 const InstanceKlass* const super = this_klass->super(); 4290 4291 if (super != nullptr) { 4292 if (super->is_final()) { 4293 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD); 4294 return; 4295 } 4296 4297 if (super->is_sealed()) { 4298 stringStream ss; 4299 ResourceMark rm(THREAD); 4300 if (!super->has_as_permitted_subclass(this_klass, ss)) { 4301 classfile_icce_error(ss.as_string(), THREAD); 4302 return; 4303 } 4304 } 4305 4306 // The JVMS says that super classes for value types must not have the ACC_IDENTITY 4307 // flag set. But, java.lang.Object must still be allowed to be a direct super class 4308 // for value classes. So, it is treated as a special case for now. 4309 if (!this_klass->access_flags().is_identity_class() && 4310 super->name() != vmSymbols::java_lang_Object() && 4311 super->is_identity_class()) { 4312 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD); 4313 return; 4314 } 4315 4316 Reflection::VerifyClassAccessResults vca_result = 4317 Reflection::verify_class_access(this_klass, super, false); 4318 if (vca_result != Reflection::ACCESS_OK) { 4319 ResourceMark rm(THREAD); 4320 char* msg = Reflection::verify_class_access_msg(this_klass, 4321 super, 4322 vca_result); 4323 4324 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4325 if (msg == nullptr) { 4326 bool same_module = (this_klass->module() == super->module()); 4327 Exceptions::fthrow( 4328 THREAD_AND_LOCATION, 4329 vmSymbols::java_lang_IllegalAccessError(), 4330 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4331 this_klass->external_name(), 4332 super->is_abstract() ? "abstract " : "", 4333 super->external_name(), 4334 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4335 (same_module) ? "" : "; ", 4336 (same_module) ? "" : super->class_in_module_of_loader()); 4337 } else { 4338 // Add additional message content. 4339 Exceptions::fthrow( 4340 THREAD_AND_LOCATION, 4341 vmSymbols::java_lang_IllegalAccessError(), 4342 "superclass access check failed: %s", 4343 msg); 4344 } 4345 } 4346 } 4347 } 4348 4349 4350 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4351 assert(this_klass != nullptr, "invariant"); 4352 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4353 const int lng = local_interfaces->length(); 4354 for (int i = lng - 1; i >= 0; i--) { 4355 InstanceKlass* const k = local_interfaces->at(i); 4356 assert (k != nullptr && k->is_interface(), "invalid interface"); 4357 4358 if (k->is_sealed()) { 4359 stringStream ss; 4360 ResourceMark rm(THREAD); 4361 if (!k->has_as_permitted_subclass(this_klass, ss)) { 4362 classfile_icce_error(ss.as_string(), THREAD); 4363 return; 4364 } 4365 } 4366 4367 Reflection::VerifyClassAccessResults vca_result = 4368 Reflection::verify_class_access(this_klass, k, false); 4369 if (vca_result != Reflection::ACCESS_OK) { 4370 ResourceMark rm(THREAD); 4371 char* msg = Reflection::verify_class_access_msg(this_klass, 4372 k, 4373 vca_result); 4374 4375 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4376 if (msg == nullptr) { 4377 bool same_module = (this_klass->module() == k->module()); 4378 Exceptions::fthrow( 4379 THREAD_AND_LOCATION, 4380 vmSymbols::java_lang_IllegalAccessError(), 4381 "class %s cannot access its superinterface %s (%s%s%s)", 4382 this_klass->external_name(), 4383 k->external_name(), 4384 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4385 (same_module) ? "" : "; ", 4386 (same_module) ? "" : k->class_in_module_of_loader()); 4387 return; 4388 } else { 4389 // Add additional message content. 4390 Exceptions::fthrow( 4391 THREAD_AND_LOCATION, 4392 vmSymbols::java_lang_IllegalAccessError(), 4393 "superinterface check failed: %s", 4394 msg); 4395 return; 4396 } 4397 } 4398 } 4399 } 4400 4401 4402 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4403 assert(this_klass != nullptr, "invariant"); 4404 const Array<Method*>* const methods = this_klass->methods(); 4405 const int num_methods = methods->length(); 4406 4407 // go thru each method and check if it overrides a final method 4408 for (int index = 0; index < num_methods; index++) { 4409 const Method* const m = methods->at(index); 4410 4411 // skip private, static, and <init> methods 4412 if ((!m->is_private() && !m->is_static()) && 4413 (m->name() != vmSymbols::object_initializer_name())) { 4414 4415 const Symbol* const name = m->name(); 4416 const Symbol* const signature = m->signature(); 4417 const InstanceKlass* k = this_klass->super(); 4418 const Method* super_m = nullptr; 4419 while (k != nullptr) { 4420 // skip supers that don't have final methods. 4421 if (k->has_final_method()) { 4422 // lookup a matching method in the super class hierarchy 4423 super_m = k->lookup_method(name, signature); 4424 if (super_m == nullptr) { 4425 break; // didn't find any match; get out 4426 } 4427 4428 if (super_m->is_final() && !super_m->is_static() && 4429 !super_m->access_flags().is_private()) { 4430 // matching method in super is final, and not static or private 4431 bool can_access = Reflection::verify_member_access(this_klass, 4432 super_m->method_holder(), 4433 super_m->method_holder(), 4434 super_m->access_flags(), 4435 false, false, CHECK); 4436 if (can_access) { 4437 // this class can access super final method and therefore override 4438 ResourceMark rm(THREAD); 4439 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 4440 err_msg("class %s overrides final method %s.%s%s", 4441 this_klass->external_name(), 4442 super_m->method_holder()->external_name(), 4443 name->as_C_string(), 4444 signature->as_C_string())); 4445 } 4446 } 4447 4448 // continue to look from super_m's holder's super. 4449 k = super_m->method_holder()->super(); 4450 continue; 4451 } 4452 4453 k = k->super(); 4454 } 4455 } 4456 } 4457 } 4458 4459 4460 // assumes that this_klass is an interface 4461 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4462 assert(this_klass != nullptr, "invariant"); 4463 assert(this_klass->is_interface(), "not an interface"); 4464 const Array<Method*>* methods = this_klass->methods(); 4465 const int num_methods = methods->length(); 4466 4467 for (int index = 0; index < num_methods; index++) { 4468 const Method* const m = methods->at(index); 4469 // if m is static and not the init method, throw a verify error 4470 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4471 ResourceMark rm(THREAD); 4472 4473 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4474 Exceptions::fthrow( 4475 THREAD_AND_LOCATION, 4476 vmSymbols::java_lang_VerifyError(), 4477 "Illegal static method %s in interface %s", 4478 m->name()->as_C_string(), 4479 this_klass->external_name() 4480 ); 4481 return; 4482 } 4483 } 4484 } 4485 4486 // utility methods for format checking 4487 4488 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null. 4489 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const { 4490 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4491 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4492 if (is_module) { 4493 ResourceMark rm(THREAD); 4494 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4495 Exceptions::fthrow( 4496 THREAD_AND_LOCATION, 4497 vmSymbols::java_lang_NoClassDefFoundError(), 4498 "%s is not a class because access_flag ACC_MODULE is set", 4499 _class_name->as_C_string()); 4500 return; 4501 } 4502 4503 if (!_need_verify) { return; } 4504 4505 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4506 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4507 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4508 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0; 4509 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4510 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4511 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4512 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final)); 4513 4514 if ((is_abstract && is_final) || 4515 (is_interface && !is_abstract) || 4516 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces 4517 (!is_interface && major_gte_1_5 && is_annotation) || 4518 (!valid_value_class)) { 4519 ResourceMark rm(THREAD); 4520 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4521 if (inner_name == nullptr && !is_anonymous_inner_class) { 4522 Exceptions::fthrow( 4523 THREAD_AND_LOCATION, 4524 vmSymbols::java_lang_ClassFormatError(), 4525 "Illegal class modifiers in class %s: 0x%X", 4526 _class_name->as_C_string(), flags 4527 ); 4528 } else { 4529 if (is_anonymous_inner_class) { 4530 Exceptions::fthrow( 4531 THREAD_AND_LOCATION, 4532 vmSymbols::java_lang_ClassFormatError(), 4533 "Illegal class modifiers in anonymous inner class of class %s: 0x%X", 4534 _class_name->as_C_string(), flags 4535 ); 4536 } else { 4537 Exceptions::fthrow( 4538 THREAD_AND_LOCATION, 4539 vmSymbols::java_lang_ClassFormatError(), 4540 "Illegal class modifiers in inner class %s of class %s: 0x%X", 4541 inner_name->as_C_string(), _class_name->as_C_string(), flags 4542 ); 4543 } 4544 } 4545 return; 4546 } 4547 } 4548 4549 static bool has_illegal_visibility(jint flags) { 4550 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4551 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4552 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4553 4554 return ((is_public && is_protected) || 4555 (is_public && is_private) || 4556 (is_protected && is_private)); 4557 } 4558 4559 // A legal major_version.minor_version must be one of the following: 4560 // 4561 // Major_version >= 45 and major_version < 56, any minor_version. 4562 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. 4563 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. 4564 // 4565 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4566 ResourceMark rm(THREAD); 4567 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4568 if (major < JAVA_MIN_SUPPORTED_VERSION) { 4569 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version", 4570 class_name, major, minor, THREAD); 4571 return; 4572 } 4573 4574 if (major > max_version) { 4575 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4576 Exceptions::fthrow( 4577 THREAD_AND_LOCATION, 4578 vmSymbols::java_lang_UnsupportedClassVersionError(), 4579 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4580 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4581 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4582 return; 4583 } 4584 4585 if (major < JAVA_12_VERSION || minor == 0) { 4586 return; 4587 } 4588 4589 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4590 if (major != max_version) { 4591 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4592 Exceptions::fthrow( 4593 THREAD_AND_LOCATION, 4594 vmSymbols::java_lang_UnsupportedClassVersionError(), 4595 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4596 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4597 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4598 return; 4599 } 4600 4601 if (!Arguments::enable_preview()) { 4602 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4603 class_name, major, minor, THREAD); 4604 return; 4605 } 4606 4607 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4608 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4609 class_name, major, minor, THREAD); 4610 } 4611 } 4612 4613 void ClassFileParser:: verify_legal_field_modifiers(jint flags, 4614 AccessFlags class_access_flags, 4615 TRAPS) const { 4616 if (!_need_verify) { return; } 4617 4618 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4619 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4620 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4621 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4622 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4623 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4624 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4625 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4626 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0; 4627 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4628 4629 const bool is_interface = class_access_flags.is_interface(); 4630 const bool is_identity_class = class_access_flags.is_identity_class(); 4631 4632 bool is_illegal = false; 4633 const char* error_msg = ""; 4634 4635 // There is some overlap in the checks that apply, for example interface fields 4636 // must be static, static fields can't be strict, and therefore interfaces can't 4637 // have strict fields. So we don't have to check every possible invalid combination 4638 // individually as long as all are covered. Once we have found an illegal combination 4639 // we can stop checking. 4640 4641 if (!is_illegal) { 4642 if (is_interface) { 4643 if (!is_public || !is_static || !is_final || is_private || 4644 is_protected || is_volatile || is_transient || 4645 (major_gte_1_5 && is_enum)) { 4646 is_illegal = true; 4647 error_msg = "interface fields must be public, static and final, and may be synthetic"; 4648 } 4649 } else { // not interface 4650 if (has_illegal_visibility(flags)) { 4651 is_illegal = true; 4652 error_msg = "invalid visibility flags for class field"; 4653 } else if (is_final && is_volatile) { 4654 is_illegal = true; 4655 error_msg = "fields cannot be final and volatile"; 4656 } else if (supports_inline_types()) { 4657 if (!is_identity_class && !is_static && (!is_strict || !is_final)) { 4658 is_illegal = true; 4659 error_msg = "value class fields must be either non-static final and strict, or static"; 4660 } 4661 } 4662 } 4663 } 4664 4665 if (is_illegal) { 4666 ResourceMark rm(THREAD); 4667 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4668 Exceptions::fthrow( 4669 THREAD_AND_LOCATION, 4670 vmSymbols::java_lang_ClassFormatError(), 4671 "Illegal field modifiers (%s) in class %s: 0x%X", 4672 error_msg, _class_name->as_C_string(), flags); 4673 return; 4674 } 4675 } 4676 4677 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4678 AccessFlags class_access_flags, 4679 const Symbol* name, 4680 TRAPS) const { 4681 if (!_need_verify) { return; } 4682 4683 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4684 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4685 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4686 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4687 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4688 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4689 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4690 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4691 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4692 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4693 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4694 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4695 const bool major_gte_17 = _major_version >= JAVA_17_VERSION; 4696 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4697 const bool is_interface = class_access_flags.is_interface(); 4698 const bool is_identity_class = class_access_flags.is_identity_class(); 4699 4700 bool is_illegal = false; 4701 const char* class_note = ""; 4702 4703 if (is_interface) { 4704 if (major_gte_8) { 4705 // Class file version is JAVA_8_VERSION or later Methods of 4706 // interfaces may set any of the flags except ACC_PROTECTED, 4707 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4708 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4709 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4710 (is_native || is_protected || is_final || is_synchronized) || 4711 // If a specific method of a class or interface has its 4712 // ACC_ABSTRACT flag set, it must not have any of its 4713 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4714 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4715 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4716 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4717 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) { 4718 is_illegal = true; 4719 } 4720 } else if (major_gte_1_5) { 4721 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4722 if (!is_public || is_private || is_protected || is_static || is_final || 4723 is_synchronized || is_native || !is_abstract || is_strict) { 4724 is_illegal = true; 4725 } 4726 } else { 4727 // Class file version is pre-JAVA_1_5_VERSION 4728 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4729 is_illegal = true; 4730 } 4731 } 4732 } else { // not interface 4733 if (has_illegal_visibility(flags)) { 4734 is_illegal = true; 4735 } else { 4736 if (is_initializer) { 4737 if (is_static || is_final || is_synchronized || is_native || 4738 is_abstract || (major_gte_1_5 && is_bridge)) { 4739 is_illegal = true; 4740 } 4741 } else { // not initializer 4742 if (!is_identity_class && is_synchronized && !is_static) { 4743 is_illegal = true; 4744 class_note = " (not an identity class)"; 4745 } else { 4746 if (is_abstract) { 4747 if ((is_final || is_native || is_private || is_static || 4748 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) { 4749 is_illegal = true; 4750 } 4751 } 4752 } 4753 } 4754 } 4755 } 4756 4757 if (is_illegal) { 4758 ResourceMark rm(THREAD); 4759 // Names are all known to be < 64k so we know this formatted message is not excessively large. 4760 Exceptions::fthrow( 4761 THREAD_AND_LOCATION, 4762 vmSymbols::java_lang_ClassFormatError(), 4763 "Method %s in class %s%s has illegal modifiers: 0x%X", 4764 name->as_C_string(), _class_name->as_C_string(), class_note, flags); 4765 return; 4766 } 4767 } 4768 4769 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 4770 int length, 4771 TRAPS) const { 4772 assert(_need_verify, "only called when _need_verify is true"); 4773 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP. 4774 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) { 4775 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD); 4776 } 4777 } 4778 4779 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4780 // In class names, '/' separates unqualified names. This is verified in this function also. 4781 // Method names also may not contain the characters '<' or '>', unless <init> 4782 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4783 // method. Because these names have been checked as special cases before 4784 // calling this method in verify_legal_method_name. 4785 // 4786 // This method is also called from the modular system APIs in modules.cpp 4787 // to verify the validity of module and package names. 4788 bool ClassFileParser::verify_unqualified_name(const char* name, 4789 unsigned int length, 4790 int type) { 4791 if (length == 0) return false; // Must have at least one char. 4792 for (const char* p = name; p != name + length; p++) { 4793 switch(*p) { 4794 case JVM_SIGNATURE_DOT: 4795 case JVM_SIGNATURE_ENDCLASS: 4796 case JVM_SIGNATURE_ARRAY: 4797 // do not permit '.', ';', or '[' 4798 return false; 4799 case JVM_SIGNATURE_SLASH: 4800 // check for '//' or leading or trailing '/' which are not legal 4801 // unqualified name must not be empty 4802 if (type == ClassFileParser::LegalClass) { 4803 if (p == name || p+1 >= name+length || 4804 *(p+1) == JVM_SIGNATURE_SLASH) { 4805 return false; 4806 } 4807 } else { 4808 return false; // do not permit '/' unless it's class name 4809 } 4810 break; 4811 case JVM_SIGNATURE_SPECIAL: 4812 case JVM_SIGNATURE_ENDSPECIAL: 4813 // do not permit '<' or '>' in method names 4814 if (type == ClassFileParser::LegalMethod) { 4815 return false; 4816 } 4817 } 4818 } 4819 return true; 4820 } 4821 4822 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) { 4823 if (_loadable_descriptors == nullptr) return false; 4824 for (int i = 0; i < _loadable_descriptors->length(); i++) { 4825 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i)); 4826 if (class_name == klass) return true; 4827 } 4828 return false; 4829 } 4830 4831 // Take pointer to a UTF8 byte string (not NUL-terminated). 4832 // Skip over the longest part of the string that could 4833 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true. 4834 // Return a pointer to just past the fieldname. 4835 // Return null if no fieldname at all was found, or in the case of slash_ok 4836 // being true, we saw consecutive slashes (meaning we were looking for a 4837 // qualified path but found something that was badly-formed). 4838 static const char* skip_over_field_name(const char* const name, 4839 bool slash_ok, 4840 unsigned int length) { 4841 const char* p; 4842 jboolean last_is_slash = false; 4843 jboolean not_first_ch = false; 4844 4845 for (p = name; p != name + length; not_first_ch = true) { 4846 const char* old_p = p; 4847 jchar ch = *p; 4848 if (ch < 128) { 4849 p++; 4850 // quick check for ascii 4851 if ((ch >= 'a' && ch <= 'z') || 4852 (ch >= 'A' && ch <= 'Z') || 4853 (ch == '_' || ch == '$') || 4854 (not_first_ch && ch >= '0' && ch <= '9')) { 4855 last_is_slash = false; 4856 continue; 4857 } 4858 if (slash_ok && ch == JVM_SIGNATURE_SLASH) { 4859 if (last_is_slash) { 4860 return nullptr; // Don't permit consecutive slashes 4861 } 4862 last_is_slash = true; 4863 continue; 4864 } 4865 } 4866 else { 4867 jint unicode_ch; 4868 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4869 p = tmp_p; 4870 last_is_slash = false; 4871 // Check if ch is Java identifier start or is Java identifier part 4872 // 4672820: call java.lang.Character methods directly without generating separate tables. 4873 EXCEPTION_MARK; 4874 // return value 4875 JavaValue result(T_BOOLEAN); 4876 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 4877 JavaCallArguments args; 4878 args.push_int(unicode_ch); 4879 4880 if (not_first_ch) { 4881 // public static boolean isJavaIdentifierPart(char ch); 4882 JavaCalls::call_static(&result, 4883 vmClasses::Character_klass(), 4884 vmSymbols::isJavaIdentifierPart_name(), 4885 vmSymbols::int_bool_signature(), 4886 &args, 4887 THREAD); 4888 } else { 4889 // public static boolean isJavaIdentifierStart(char ch); 4890 JavaCalls::call_static(&result, 4891 vmClasses::Character_klass(), 4892 vmSymbols::isJavaIdentifierStart_name(), 4893 vmSymbols::int_bool_signature(), 4894 &args, 4895 THREAD); 4896 } 4897 if (HAS_PENDING_EXCEPTION) { 4898 CLEAR_PENDING_EXCEPTION; 4899 return nullptr; 4900 } 4901 if(result.get_jboolean()) { 4902 continue; 4903 } 4904 } 4905 return (not_first_ch) ? old_p : nullptr; 4906 } 4907 return (not_first_ch && !last_is_slash) ? p : nullptr; 4908 } 4909 4910 // Take pointer to a UTF8 byte string (not NUL-terminated). 4911 // Skip over the longest part of the string that could 4912 // be taken as a field signature. Allow "void" if void_ok. 4913 // Return a pointer to just past the signature. 4914 // Return null if no legal signature is found. 4915 const char* ClassFileParser::skip_over_field_signature(const char* signature, 4916 bool void_ok, 4917 unsigned int length, 4918 TRAPS) const { 4919 unsigned int array_dim = 0; 4920 while (length > 0) { 4921 switch (signature[0]) { 4922 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; } 4923 case JVM_SIGNATURE_BOOLEAN: 4924 case JVM_SIGNATURE_BYTE: 4925 case JVM_SIGNATURE_CHAR: 4926 case JVM_SIGNATURE_SHORT: 4927 case JVM_SIGNATURE_INT: 4928 case JVM_SIGNATURE_FLOAT: 4929 case JVM_SIGNATURE_LONG: 4930 case JVM_SIGNATURE_DOUBLE: 4931 return signature + 1; 4932 case JVM_SIGNATURE_CLASS: { 4933 if (_major_version < JAVA_1_5_VERSION) { 4934 signature++; 4935 length--; 4936 // Skip over the class name if one is there 4937 const char* const p = skip_over_field_name(signature, true, length); 4938 assert(p == nullptr || p > signature, "must parse one character at least"); 4939 // The next character better be a semicolon 4940 if (p != nullptr && // Parse of field name succeeded. 4941 p - signature < static_cast<int>(length) && // There is at least one character left to parse. 4942 p[0] == JVM_SIGNATURE_ENDCLASS) { 4943 return p + 1; 4944 } 4945 } 4946 else { 4947 // Skip leading 'L' and ignore first appearance of ';' 4948 signature++; 4949 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); 4950 // Format check signature 4951 if (c != nullptr) { 4952 int newlen = pointer_delta_as_int(c, (char*) signature); 4953 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 4954 if (!legal) { 4955 classfile_parse_error("Class name is empty or contains illegal character " 4956 "in descriptor in class file %s", 4957 THREAD); 4958 return nullptr; 4959 } 4960 return signature + newlen + 1; 4961 } 4962 } 4963 return nullptr; 4964 } 4965 case JVM_SIGNATURE_ARRAY: 4966 array_dim++; 4967 if (array_dim > 255) { 4968 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 4969 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD); 4970 return nullptr; 4971 } 4972 // The rest of what's there better be a legal signature 4973 signature++; 4974 length--; 4975 void_ok = false; 4976 break; 4977 default: 4978 return nullptr; 4979 } 4980 } 4981 return nullptr; 4982 } 4983 4984 // Checks if name is a legal class name. 4985 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 4986 if (!_need_verify) { return; } 4987 4988 assert(name->refcount() > 0, "symbol must be kept alive"); 4989 char* bytes = (char*)name->bytes(); 4990 unsigned int length = name->utf8_length(); 4991 bool legal = false; 4992 4993 if (length > 0) { 4994 const char* p; 4995 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4996 p = skip_over_field_signature(bytes, false, length, CHECK); 4997 legal = (p != nullptr) && ((p - bytes) == (int)length); 4998 } else if (_major_version < JAVA_1_5_VERSION) { 4999 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5000 p = skip_over_field_name(bytes, true, length); 5001 legal = (p != nullptr) && ((p - bytes) == (int)length); 5002 } 5003 } else { 5004 // 4900761: relax the constraints based on JSR202 spec 5005 // Class names may be drawn from the entire Unicode character set. 5006 // Identifiers between '/' must be unqualified names. 5007 // The utf8 string has been verified when parsing cpool entries. 5008 legal = verify_unqualified_name(bytes, length, LegalClass); 5009 } 5010 } 5011 if (!legal) { 5012 ResourceMark rm(THREAD); 5013 assert(_class_name != nullptr, "invariant"); 5014 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5015 Exceptions::fthrow( 5016 THREAD_AND_LOCATION, 5017 vmSymbols::java_lang_ClassFormatError(), 5018 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5019 _class_name->as_C_string() 5020 ); 5021 return; 5022 } 5023 } 5024 5025 // Checks if name is a legal field name. 5026 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5027 if (!_need_verify) { return; } 5028 5029 char* bytes = (char*)name->bytes(); 5030 unsigned int length = name->utf8_length(); 5031 bool legal = false; 5032 5033 if (length > 0) { 5034 if (_major_version < JAVA_1_5_VERSION) { 5035 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5036 const char* p = skip_over_field_name(bytes, false, length); 5037 legal = (p != nullptr) && ((p - bytes) == (int)length); 5038 } 5039 } else { 5040 // 4881221: relax the constraints based on JSR202 spec 5041 legal = verify_unqualified_name(bytes, length, LegalField); 5042 } 5043 } 5044 5045 if (!legal) { 5046 ResourceMark rm(THREAD); 5047 assert(_class_name != nullptr, "invariant"); 5048 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5049 Exceptions::fthrow( 5050 THREAD_AND_LOCATION, 5051 vmSymbols::java_lang_ClassFormatError(), 5052 "Illegal field name \"%.*s\" in class %s", length, bytes, 5053 _class_name->as_C_string() 5054 ); 5055 return; 5056 } 5057 } 5058 5059 // Checks if name is a legal method name. 5060 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5061 if (!_need_verify) { return; } 5062 5063 assert(name != nullptr, "method name is null"); 5064 char* bytes = (char*)name->bytes(); 5065 unsigned int length = name->utf8_length(); 5066 bool legal = false; 5067 5068 if (length > 0) { 5069 if (bytes[0] == JVM_SIGNATURE_SPECIAL) { 5070 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5071 legal = true; 5072 } 5073 } else if (_major_version < JAVA_1_5_VERSION) { 5074 const char* p; 5075 p = skip_over_field_name(bytes, false, length); 5076 legal = (p != nullptr) && ((p - bytes) == (int)length); 5077 } else { 5078 // 4881221: relax the constraints based on JSR202 spec 5079 legal = verify_unqualified_name(bytes, length, LegalMethod); 5080 } 5081 } 5082 5083 if (!legal) { 5084 ResourceMark rm(THREAD); 5085 assert(_class_name != nullptr, "invariant"); 5086 // Names are all known to be < 64k so we know this formatted message is not excessively large. 5087 Exceptions::fthrow( 5088 THREAD_AND_LOCATION, 5089 vmSymbols::java_lang_ClassFormatError(), 5090 "Illegal method name \"%.*s\" in class %s", length, bytes, 5091 _class_name->as_C_string() 5092 ); 5093 return; 5094 } 5095 } 5096 5097 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const { 5098 const char* const bytes = (const char*)signature->bytes(); 5099 const unsigned int length = signature->utf8_length(); 5100 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false); 5101 5102 if (p == nullptr || (p - bytes) != (int)length) { 5103 return false; 5104 } 5105 return true; 5106 } 5107 5108 // Checks if signature is a legal field signature. 5109 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5110 const Symbol* signature, 5111 TRAPS) const { 5112 if (!_need_verify) { return; } 5113 5114 if (!legal_field_signature(signature, THREAD)) { 5115 CLEAR_PENDING_EXCEPTION; // throw this exception instead 5116 throwIllegalSignature("Field", name, signature, CHECK); 5117 } 5118 } 5119 5120 // Check that the signature is compatible with the method name. For example, 5121 // check that <init> has a void signature. 5122 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name, 5123 const Symbol* signature, 5124 TRAPS) const { 5125 if (!_need_verify) { 5126 return; 5127 } 5128 5129 // Class initializers cannot have args for class format version >= 51. 5130 if (name == vmSymbols::class_initializer_name() && 5131 signature != vmSymbols::void_method_signature() && 5132 _major_version >= JAVA_7_VERSION) { 5133 throwIllegalSignature("Method", name, signature, THREAD); 5134 return; 5135 } 5136 5137 int sig_length = signature->utf8_length(); 5138 if (name->utf8_length() > 0 && 5139 name->char_at(0) == JVM_SIGNATURE_SPECIAL && 5140 sig_length > 0 && 5141 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) { 5142 throwIllegalSignature("Method", name, signature, THREAD); 5143 } 5144 } 5145 5146 // Checks if signature is a legal method signature. 5147 // Returns number of parameters 5148 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5149 const Symbol* signature, 5150 TRAPS) const { 5151 if (!_need_verify) { 5152 // make sure caller's args_size will be less than 0 even for non-static 5153 // method so it will be recomputed in compute_size_of_parameters(). 5154 return -2; 5155 } 5156 5157 unsigned int args_size = 0; 5158 const char* p = (const char*)signature->bytes(); 5159 unsigned int length = signature->utf8_length(); 5160 const char* nextp; 5161 5162 // The first character must be a '(' 5163 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5164 length--; 5165 // Skip over legal field signatures 5166 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5167 while ((length > 0) && (nextp != nullptr)) { 5168 args_size++; 5169 if (p[0] == 'J' || p[0] == 'D') { 5170 args_size++; 5171 } 5172 length -= pointer_delta_as_int(nextp, p); 5173 p = nextp; 5174 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5175 } 5176 // The first non-signature thing better be a ')' 5177 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5178 length--; 5179 // Now we better just have a return value 5180 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5181 if (nextp && ((int)length == (nextp - p))) { 5182 return args_size; 5183 } 5184 } 5185 } 5186 // Report error 5187 throwIllegalSignature("Method", name, signature, THREAD); 5188 return 0; 5189 } 5190 5191 int ClassFileParser::static_field_size() const { 5192 assert(_layout_info != nullptr, "invariant"); 5193 return _layout_info->_static_field_size; 5194 } 5195 5196 int ClassFileParser::total_oop_map_count() const { 5197 assert(_layout_info != nullptr, "invariant"); 5198 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count; 5199 } 5200 5201 jint ClassFileParser::layout_size() const { 5202 assert(_layout_info != nullptr, "invariant"); 5203 return _layout_info->_instance_size; 5204 } 5205 5206 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5207 const Array<Method*>* methods) { 5208 assert(ik != nullptr, "invariant"); 5209 assert(methods != nullptr, "invariant"); 5210 5211 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5212 // (We used to do this lazily, but now we query it in Rewriter, 5213 // which is eagerly done for every method, so we might as well do it now, 5214 // when everything is fresh in memory.) 5215 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik); 5216 5217 if (klass_id != vmSymbolID::NO_SID) { 5218 for (int j = 0; j < methods->length(); ++j) { 5219 Method* method = methods->at(j); 5220 method->init_intrinsic_id(klass_id); 5221 5222 if (CheckIntrinsics) { 5223 // Check if an intrinsic is defined for method 'method', 5224 // but the method is not annotated with @IntrinsicCandidate. 5225 if (method->intrinsic_id() != vmIntrinsics::_none && 5226 !method->intrinsic_candidate()) { 5227 tty->print("Compiler intrinsic is defined for method [%s], " 5228 "but the method is not annotated with @IntrinsicCandidate.%s", 5229 method->name_and_sig_as_C_string(), 5230 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5231 ); 5232 tty->cr(); 5233 DEBUG_ONLY(vm_exit(1)); 5234 } 5235 // Check is the method 'method' is annotated with @IntrinsicCandidate, 5236 // but there is no intrinsic available for it. 5237 if (method->intrinsic_candidate() && 5238 method->intrinsic_id() == vmIntrinsics::_none) { 5239 tty->print("Method [%s] is annotated with @IntrinsicCandidate, " 5240 "but no compiler intrinsic is defined for the method.%s", 5241 method->name_and_sig_as_C_string(), 5242 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5243 ); 5244 tty->cr(); 5245 DEBUG_ONLY(vm_exit(1)); 5246 } 5247 } 5248 } // end for 5249 5250 #ifdef ASSERT 5251 if (CheckIntrinsics) { 5252 // Check for orphan methods in the current class. A method m 5253 // of a class C is orphan if an intrinsic is defined for method m, 5254 // but class C does not declare m. 5255 // The check is potentially expensive, therefore it is available 5256 // only in debug builds. 5257 5258 for (auto id : EnumRange<vmIntrinsicID>{}) { 5259 if (vmIntrinsics::_compiledLambdaForm == id) { 5260 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5261 // generated for the JVM from a LambdaForm and therefore no method 5262 // is defined for it. 5263 continue; 5264 } 5265 if (vmIntrinsics::_blackhole == id) { 5266 // The _blackhole intrinsic is a special marker. No explicit method 5267 // is defined for it. 5268 continue; 5269 } 5270 5271 if (vmIntrinsics::class_for(id) == klass_id) { 5272 // Check if the current class contains a method with the same 5273 // name, flags, signature. 5274 bool match = false; 5275 for (int j = 0; j < methods->length(); ++j) { 5276 const Method* method = methods->at(j); 5277 if (method->intrinsic_id() == id) { 5278 match = true; 5279 break; 5280 } 5281 } 5282 5283 if (!match) { 5284 char buf[1000]; 5285 tty->print("Compiler intrinsic is defined for method [%s], " 5286 "but the method is not available in class [%s].%s", 5287 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)), 5288 ik->name()->as_C_string(), 5289 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5290 ); 5291 tty->cr(); 5292 DEBUG_ONLY(vm_exit(1)); 5293 } 5294 } 5295 } // end for 5296 } // CheckIntrinsics 5297 #endif // ASSERT 5298 } 5299 } 5300 5301 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, 5302 const ClassInstanceInfo& cl_inst_info, 5303 TRAPS) { 5304 if (_klass != nullptr) { 5305 return _klass; 5306 } 5307 5308 InstanceKlass* const ik = 5309 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5310 5311 if (is_hidden()) { 5312 mangle_hidden_class_name(ik); 5313 } 5314 5315 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL); 5316 5317 assert(_klass == ik, "invariant"); 5318 return ik; 5319 } 5320 5321 void ClassFileParser::create_acmp_maps(InstanceKlass* ik, TRAPS) { 5322 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset); 5323 // Current format of acmp maps: 5324 // All maps are stored contiguously in a single int array because it might 5325 // be too early to instantiate an Object array (to be investigated) 5326 // Format is: 5327 // [number_of_nonoop_entries][offset0][size0][offset1][size1]...[oop_offset0][oop_offset1]... 5328 // ^ ^ 5329 // | | 5330 // --------------------- Pair of integer describing a segment of 5331 // contiguous non-oop fields 5332 // First element is the number of segment of contiguous non-oop fields 5333 // Then, each segment of contiguous non-oop fields is described by two consecutive elements: 5334 // the offset then the size. 5335 // After the last segment of contiguous non-oop fields, oop fields are described, one element 5336 // per oop field, containing the offset of the field. 5337 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2; 5338 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length(); 5339 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1; 5340 5341 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK); 5342 typeArrayHandle map_h(THREAD, map); 5343 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK); 5344 5345 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length()); 5346 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length()); 5347 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) { 5348 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset); 5349 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size); 5350 5351 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data. 5352 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset); 5353 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size); 5354 } 5355 int oop_map_start = nonoop_acmp_map_size + 1; 5356 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) { 5357 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i)); 5358 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i)); 5359 } 5360 assert(acmp_maps_array->length() == map_h->length(), "sanity"); 5361 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h()); 5362 ik->set_acmp_maps_array(acmp_maps_array); 5363 } 5364 5365 // See the declarations of _fast_acmp_offset and _fast_acmp_mask in InlineKlass::Members 5366 // for details about the fast path logic, and the meaning of these values. 5367 void ClassFileParser::set_fast_acmp_members(InlineKlass* vk) const { 5368 if (_layout_info->_oop_acmp_map->length() > 0) { // Oops are not allowed in the fast path 5369 return; 5370 } 5371 5372 int64_t mask = 0; 5373 #ifndef VM_LITTLE_ENDIAN 5374 // Leaving the mask and offset to default values (that is just "return;") is a correct and easy way to implement 5375 // this for other endianness, but it will have a runtime cost in do_acmp, without the benefit. It is better, and 5376 // probably easy with access to such an architecture, to adapt the logic below 5377 // for big-endian architectures, but filling the mask from the other end. I prefer not to do it blindly. 5378 vk->set_fast_acmp_offset(0); 5379 vk->set_fast_acmp_mask(mask); 5380 5381 #else 5382 5383 // Compute the mask for a memory zone with offset "start" and of size "size", both in bytes, 5384 // assuming it won't overflow the long. In little endian, the byte with smallest address/smallest offset/closest from header 5385 // will be the least significant byte. 5386 // Value Memory layout 5387 // make_mask_piece(0, 1) = 0x0000 0000 0000 00ff => ff | 00 | 00 | 00 | 00 | 00 | 00 | 00 5388 // make_mask_piece(0, 1) = 0x0000 0000 0000 ffff => ff | ff | 00 | 00 | 00 | 00 | 00 | 00 5389 // make_mask_piece(1, 1) = 0x0000 0000 0000 ff00 => 00 | ff | 00 | 00 | 00 | 00 | 00 | 00 5390 // make_mask_piece(1, 3) = 0x0000 0000 ffff ff00 => 00 | ff | ff | ff | 00 | 00 | 00 | 00 5391 auto make_mask_piece = [](int start, int size) -> int64_t { return right_n_bits<int64_t>(size * BitsPerByte) << (start * BitsPerByte); }; 5392 5393 // We build the mask for a 64-bit load from the start of the payload. For each contiguous piece of memory 5394 // we build the mask containing 1's where it would be in the loaded long: it must be as 5395 // long as the memory that is being accessed, but the placement depends on the endianness. 5396 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) { 5397 int piece_start = _layout_info->_nonoop_acmp_map->at(i)._offset - _layout_info->_payload_offset; 5398 int piece_size = _layout_info->_nonoop_acmp_map->at(i)._size; 5399 int piece_end = piece_start + piece_size - 1; 5400 if (piece_end >= BytesPerLong) { // Too far! Can't fit in an 8-byte load, fast path will not be taken 5401 return; 5402 } 5403 int64_t mask_piece = make_mask_piece(piece_start, piece_size); 5404 mask |= mask_piece; 5405 } 5406 5407 // If the payload is smaller than 64 bits, reading a long after the header can lead to an over-read. To avoid that, we can move the 5408 // load to a lower offset (toward the beginning of the object), and adjust the mask accordingly, even if it means reading (part of) 5409 // the header: the mask will filter that out. 5410 // Since an object cannot be less than 8 bytes, it's surely safe. 5411 if (mask == 0) { 5412 // Special case: empty object. There is nothing to compare, and no payload. We can just read from the start 5413 // of the header to ensure we load within the object. We can't use the general case: count_leading_zeros/count_trailing_zeros doesn't 5414 // accept null argument. This case is endianness-agnostic. 5415 vk->set_fast_acmp_offset(0); 5416 vk->set_fast_acmp_mask(mask); 5417 } else { 5418 // In little endian, if the payload is not a full 64 bits, the mask will have leading 0s (most significant bytes are bytes with 5419 // higher addresses/higher offset/further from the header). We can shift the mask so that there aren't leading 0s anymore, and 5420 // decrease the offset by the same amount. 5421 // For instance, let's say _payload_offset is 16, and the mask is 0x0000 ffff ffff 00ff, we have 16 leading 0s 5422 // (the bubble at offset 1 is fine: it might be due to padding). Reading from the start of the payload might read 2 bytes 5423 // after the end of the payload. To avoid that, we are going to shift the payload by 16 bits, and remove 2 bytes 5424 // from the offset we should load from. At the end, fast_acmp_offset will be 14 and the mask 0xffff ffff 00ff 0000. 5425 // The lowest 16 0s introduced by the shift will filter out the 2 bytes we read from the header. 5426 // Big endian architectures probably need to look at count_trailing_zeros, and shift right until the last bit is 1. 5427 // The offset still needs to be decreased. 5428 int leading_zeroes = static_cast<int>(count_leading_zeros(mask)); 5429 assert(leading_zeroes % BitsPerByte == 0, "we should mask full bytes"); 5430 mask <<= leading_zeroes; 5431 assert(count_leading_zeros(mask) == 0, "fast acmp mask can be moved further!"); 5432 int offset = _layout_info->_payload_offset - leading_zeroes / BitsPerByte; 5433 assert(offset >= 0, "fast acmp path shouldn't load before the object"); 5434 vk->set_fast_acmp_offset(offset); 5435 vk->set_fast_acmp_mask(mask); 5436 } 5437 #endif // VM_LITTLE_ENDIAN 5438 } 5439 5440 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, 5441 bool changed_by_loadhook, 5442 const ClassInstanceInfo& cl_inst_info, 5443 TRAPS) { 5444 assert(ik != nullptr, "invariant"); 5445 5446 // Set name and CLD before adding to CLD 5447 ik->set_class_loader_data(_loader_data); 5448 ik->set_class_loader_type(); 5449 ik->set_name(_class_name); 5450 5451 // Add all classes to our internal class loader list here, 5452 // including classes in the bootstrap (null) class loader. 5453 const bool publicize = !is_internal(); 5454 5455 _loader_data->add_class(ik, publicize); 5456 5457 set_klass_to_deallocate(ik); 5458 5459 assert(_layout_info != nullptr, "invariant"); 5460 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity"); 5461 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count, 5462 "sanity"); 5463 5464 assert(ik->is_instance_klass(), "sanity"); 5465 assert(ik->size_helper() == _layout_info->_instance_size, "sanity"); 5466 5467 // Fill in information already parsed 5468 ik->set_should_verify_class(_need_verify); 5469 5470 // Not yet: supers are done below to support the new subtype-checking fields 5471 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size); 5472 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields); 5473 ik->set_has_strict_static_fields(_has_strict_static_fields); 5474 5475 if (_layout_info->_is_naturally_atomic) { 5476 ik->set_is_naturally_atomic(); 5477 } 5478 5479 if (_layout_info->_must_be_atomic) { 5480 ik->set_must_be_atomic(); 5481 } 5482 5483 ik->set_static_oop_field_count(_static_oop_count); 5484 5485 if (_has_null_restricted_static_fields) { 5486 ik->set_has_null_restricted_static_fields(); 5487 for (int i = 0; i < _temp_field_info->length(); i++) { 5488 FieldInfo& fieldinfo = _temp_field_info->at(i); 5489 if (fieldinfo.access_flags().is_static() && fieldinfo.field_flags().is_null_free_inline_type()) { 5490 Symbol* sig = fieldinfo.signature(_cp); 5491 assert(Signature::has_envelope(sig), "Must already have been checked"); 5492 TempNewSymbol name = Signature::strip_envelope(sig); 5493 if (name == _class_name) { 5494 // Replace the nullptr previously stored now that we have the InstanceKlass for this klass. 5495 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(ik)); 5496 } 5497 assert(_inline_layout_info_array->adr_at(fieldinfo.index())->klass()->is_inline_klass(), "Must be"); 5498 } 5499 } 5500 } 5501 5502 // this transfers ownership of a lot of arrays from 5503 // the parser onto the InstanceKlass* 5504 apply_parsed_class_metadata(ik, _java_fields_count); 5505 5506 // can only set dynamic nest-host after static nest information is set 5507 if (cl_inst_info.dynamic_nest_host() != nullptr) { 5508 ik->set_nest_host(cl_inst_info.dynamic_nest_host()); 5509 } 5510 5511 // note that is not safe to use the fields in the parser from this point on 5512 assert(nullptr == _cp, "invariant"); 5513 assert(nullptr == _fieldinfo_stream, "invariant"); 5514 assert(nullptr == _fieldinfo_search_table, "invariant"); 5515 assert(nullptr == _fields_status, "invariant"); 5516 assert(nullptr == _methods, "invariant"); 5517 assert(nullptr == _inner_classes, "invariant"); 5518 assert(nullptr == _nest_members, "invariant"); 5519 assert(nullptr == _loadable_descriptors, "invariant"); 5520 assert(nullptr == _combined_annotations, "invariant"); 5521 assert(nullptr == _record_components, "invariant"); 5522 assert(nullptr == _permitted_subclasses, "invariant"); 5523 assert(nullptr == _inline_layout_info_array, "invariant"); 5524 5525 if (_has_localvariable_table) { 5526 ik->set_has_localvariable_table(true); 5527 } 5528 5529 if (_has_final_method) { 5530 ik->set_has_final_method(); 5531 } 5532 5533 ik->copy_method_ordering(_method_ordering, CHECK); 5534 // The InstanceKlass::_methods_jmethod_ids cache 5535 // is managed on the assumption that the initial cache 5536 // size is equal to the number of methods in the class. If 5537 // that changes, then InstanceKlass::idnum_can_increment() 5538 // has to be changed accordingly. 5539 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length())); 5540 5541 ik->set_this_class_index(_this_class_index); 5542 5543 if (_is_hidden) { 5544 // _this_class_index is a CONSTANT_Class entry that refers to this 5545 // hidden class itself. If this class needs to refer to its own methods 5546 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference 5547 // _this_class_index. However, because this class is hidden (it's 5548 // not stored in SystemDictionary), _this_class_index cannot be resolved 5549 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5550 // Therefore, we must eagerly resolve _this_class_index now. 5551 ik->constants()->klass_at_put(_this_class_index, ik); 5552 } 5553 5554 ik->set_minor_version(_minor_version); 5555 ik->set_major_version(_major_version); 5556 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5557 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5558 5559 assert(!_is_hidden || ik->is_hidden(), "must be set already"); 5560 5561 // Set PackageEntry for this_klass 5562 oop cl = ik->class_loader(); 5563 Handle clh = Handle(THREAD, cl); 5564 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5565 ik->set_package(cld, nullptr, CHECK); 5566 5567 const Array<Method*>* const methods = ik->methods(); 5568 assert(methods != nullptr, "invariant"); 5569 const int methods_len = methods->length(); 5570 5571 check_methods_for_intrinsics(ik, methods); 5572 5573 // Fill in field values obtained by parse_classfile_attributes 5574 if (_parsed_annotations->has_any_annotations()) 5575 _parsed_annotations->apply_to(ik); 5576 5577 apply_parsed_class_attributes(ik); 5578 5579 // Miranda methods 5580 if ((_num_miranda_methods > 0) || 5581 // if this class introduced new miranda methods or 5582 (_super_klass != nullptr && _super_klass->has_miranda_methods()) 5583 // super class exists and this class inherited miranda methods 5584 ) { 5585 ik->set_has_miranda_methods(); // then set a flag 5586 } 5587 5588 // Fill in information needed to compute superclasses. 5589 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5590 ik->set_transitive_interfaces(_transitive_interfaces); 5591 ik->set_local_interfaces(_local_interfaces); 5592 _transitive_interfaces = nullptr; 5593 _local_interfaces = nullptr; 5594 5595 // Initialize itable offset tables 5596 klassItable::setup_itable_offset_table(ik); 5597 5598 // Compute transitive closure of interfaces this class implements 5599 // Do final class setup 5600 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks; 5601 if (oop_map_blocks->_nonstatic_oop_map_count > 0) { 5602 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); 5603 } 5604 5605 if (_has_contended_fields || _parsed_annotations->is_contended() || 5606 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) { 5607 ik->set_has_contended_annotations(true); 5608 } 5609 5610 // Fill in has_finalizer and layout_helper 5611 set_precomputed_flags(ik); 5612 5613 // check if this class can access its super class 5614 check_super_class_access(ik, CHECK); 5615 5616 // check if this class can access its superinterfaces 5617 check_super_interface_access(ik, CHECK); 5618 5619 // check if this class overrides any final method 5620 check_final_method_override(ik, CHECK); 5621 5622 // reject static interface methods prior to Java 8 5623 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5624 check_illegal_static_method(ik, CHECK); 5625 } 5626 5627 // Obtain this_klass' module entry 5628 ModuleEntry* module_entry = ik->module(); 5629 assert(module_entry != nullptr, "module_entry should always be set"); 5630 5631 // Obtain java.lang.Module 5632 Handle module_handle(THREAD, module_entry->module_oop()); 5633 5634 // Allocate mirror and initialize static fields 5635 java_lang_Class::create_mirror(ik, 5636 Handle(THREAD, _loader_data->class_loader()), 5637 module_handle, 5638 _protection_domain, 5639 cl_inst_info.class_data(), 5640 CHECK); 5641 5642 assert(_all_mirandas != nullptr, "invariant"); 5643 5644 // Generate any default methods - default methods are public interface methods 5645 // that have a default implementation. This is new with Java 8. 5646 if (_has_nonstatic_concrete_methods) { 5647 DefaultMethods::generate_default_methods(ik, 5648 _all_mirandas, 5649 CHECK); 5650 } 5651 5652 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5653 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5654 !module_entry->has_default_read_edges()) { 5655 if (!module_entry->set_has_default_read_edges()) { 5656 // We won a potential race 5657 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5658 } 5659 } 5660 5661 if (is_inline_type()) { 5662 InlineKlass* vk = InlineKlass::cast(ik); 5663 vk->set_payload_alignment(_layout_info->_payload_alignment); 5664 vk->set_payload_offset(_layout_info->_payload_offset); 5665 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes); 5666 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes); 5667 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment); 5668 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes); 5669 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes); 5670 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes); 5671 vk->set_null_marker_offset(_layout_info->_null_marker_offset); 5672 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset); 5673 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type(); 5674 5675 if (UseAcmpFastPath) { 5676 set_fast_acmp_members(vk); 5677 } 5678 5679 vk->initialize_calling_convention(CHECK); 5680 } 5681 5682 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface() 5683 && _class_name != vmSymbols::java_lang_Object()) { 5684 // Both abstract and concrete value classes need a field map for acmp 5685 create_acmp_maps(ik, CHECK); 5686 } 5687 5688 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5689 5690 if (!is_internal()) { 5691 ik->print_class_load_logging(_loader_data, module_entry, _stream); 5692 if (CDSConfig::is_dumping_archive()) { 5693 SystemDictionaryShared::check_code_source(ik, _stream); 5694 } 5695 5696 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5697 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && 5698 log_is_enabled(Info, class, preview)) { 5699 ResourceMark rm; 5700 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5701 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); 5702 } 5703 5704 if (log_is_enabled(Debug, class, resolve)) { 5705 ResourceMark rm; 5706 // print out the superclass. 5707 const char * from = ik->external_name(); 5708 if (ik->super() != nullptr) { 5709 log_debug(class, resolve)("%s %s (super)", 5710 from, 5711 ik->super()->external_name()); 5712 } 5713 // print out each of the interface classes referred to by this class. 5714 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5715 if (local_interfaces != nullptr) { 5716 const int length = local_interfaces->length(); 5717 for (int i = 0; i < length; i++) { 5718 const InstanceKlass* const k = local_interfaces->at(i); 5719 const char * to = k->external_name(); 5720 log_debug(class, resolve)("%s %s (interface)", from, to); 5721 } 5722 } 5723 } 5724 } 5725 5726 // If we reach here, all is well. 5727 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5728 // in order for it to not be destroyed in the ClassFileParser destructor. 5729 set_klass_to_deallocate(nullptr); 5730 5731 // it's official 5732 set_klass(ik); 5733 5734 DEBUG_ONLY(ik->verify();) 5735 } 5736 5737 void ClassFileParser::update_class_name(Symbol* new_class_name) { 5738 // Decrement the refcount in the old name, since we're clobbering it. 5739 _class_name->decrement_refcount(); 5740 5741 _class_name = new_class_name; 5742 // Increment the refcount of the new name. 5743 // Now the ClassFileParser owns this name and will decrement in 5744 // the destructor. 5745 _class_name->increment_refcount(); 5746 } 5747 5748 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5749 Symbol* name, 5750 ClassLoaderData* loader_data, 5751 const ClassLoadInfo* cl_info, 5752 Publicity pub_level, 5753 TRAPS) : 5754 _stream(stream), 5755 _class_name(nullptr), 5756 _loader_data(loader_data), 5757 _is_hidden(cl_info->is_hidden()), 5758 _can_access_vm_annotations(cl_info->can_access_vm_annotations()), 5759 _orig_cp_size(0), 5760 _static_oop_count(0), 5761 _super_klass(), 5762 _cp(nullptr), 5763 _fieldinfo_stream(nullptr), 5764 _fieldinfo_search_table(nullptr), 5765 _fields_status(nullptr), 5766 _methods(nullptr), 5767 _inner_classes(nullptr), 5768 _nest_members(nullptr), 5769 _nest_host(0), 5770 _permitted_subclasses(nullptr), 5771 _loadable_descriptors(nullptr), 5772 _record_components(nullptr), 5773 _local_interfaces(nullptr), 5774 _transitive_interfaces(nullptr), 5775 _combined_annotations(nullptr), 5776 _class_annotations(nullptr), 5777 _class_type_annotations(nullptr), 5778 _fields_annotations(nullptr), 5779 _fields_type_annotations(nullptr), 5780 _klass(nullptr), 5781 _klass_to_deallocate(nullptr), 5782 _parsed_annotations(nullptr), 5783 _layout_info(nullptr), 5784 _inline_layout_info_array(nullptr), 5785 _temp_field_info(nullptr), 5786 _method_ordering(nullptr), 5787 _all_mirandas(nullptr), 5788 _vtable_size(0), 5789 _itable_size(0), 5790 _num_miranda_methods(0), 5791 _protection_domain(cl_info->protection_domain()), 5792 _access_flags(), 5793 _pub_level(pub_level), 5794 _bad_constant_seen(0), 5795 _synthetic_flag(false), 5796 _sde_length(false), 5797 _sde_buffer(nullptr), 5798 _sourcefile_index(0), 5799 _generic_signature_index(0), 5800 _major_version(0), 5801 _minor_version(0), 5802 _this_class_index(0), 5803 _super_class_index(0), 5804 _itfs_len(0), 5805 _java_fields_count(0), 5806 _need_verify(false), 5807 _has_nonstatic_concrete_methods(false), 5808 _declares_nonstatic_concrete_methods(false), 5809 _has_localvariable_table(false), 5810 _has_final_method(false), 5811 _has_contended_fields(false), 5812 _has_aot_runtime_setup_method(false), 5813 _has_strict_static_fields(false), 5814 _has_null_restricted_static_fields(false), 5815 _must_be_atomic(true), 5816 _has_finalizer(false), 5817 _has_empty_finalizer(false), 5818 _max_bootstrap_specifier_index(-1) { 5819 5820 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name(); 5821 _class_name->increment_refcount(); 5822 5823 assert(_loader_data != nullptr, "invariant"); 5824 assert(stream != nullptr, "invariant"); 5825 assert(_stream != nullptr, "invariant"); 5826 assert(_stream->buffer() == _stream->current(), "invariant"); 5827 assert(_class_name != nullptr, "invariant"); 5828 assert(0 == _access_flags.as_unsigned_short(), "invariant"); 5829 5830 // Figure out whether we can skip format checking (matching classic VM behavior) 5831 // Always verify CFLH bytes from the user agents. 5832 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader()); 5833 5834 // synch back verification state to stream to check for truncation. 5835 stream->set_need_verify(_need_verify); 5836 5837 parse_stream(stream, CHECK); 5838 5839 post_process_parsed_stream(stream, _cp, CHECK); 5840 } 5841 5842 void ClassFileParser::clear_class_metadata() { 5843 // metadata created before the instance klass is created. Must be 5844 // deallocated if classfile parsing returns an error. 5845 _cp = nullptr; 5846 _fieldinfo_stream = nullptr; 5847 _fieldinfo_search_table = nullptr; 5848 _fields_status = nullptr; 5849 _methods = nullptr; 5850 _inner_classes = nullptr; 5851 _nest_members = nullptr; 5852 _permitted_subclasses = nullptr; 5853 _loadable_descriptors = nullptr; 5854 _combined_annotations = nullptr; 5855 _class_annotations = _class_type_annotations = nullptr; 5856 _fields_annotations = _fields_type_annotations = nullptr; 5857 _record_components = nullptr; 5858 _inline_layout_info_array = nullptr; 5859 } 5860 5861 // Destructor to clean up 5862 ClassFileParser::~ClassFileParser() { 5863 _class_name->decrement_refcount(); 5864 5865 if (_cp != nullptr) { 5866 MetadataFactory::free_metadata(_loader_data, _cp); 5867 } 5868 5869 if (_fieldinfo_stream != nullptr) { 5870 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream); 5871 } 5872 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table); 5873 5874 if (_fields_status != nullptr) { 5875 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status); 5876 } 5877 5878 if (_inline_layout_info_array != nullptr) { 5879 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array); 5880 } 5881 5882 if (_methods != nullptr) { 5883 // Free methods 5884 InstanceKlass::deallocate_methods(_loader_data, _methods); 5885 } 5886 5887 // beware of the Universe::empty_blah_array!! 5888 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) { 5889 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 5890 } 5891 5892 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) { 5893 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 5894 } 5895 5896 if (_record_components != nullptr) { 5897 InstanceKlass::deallocate_record_components(_loader_data, _record_components); 5898 } 5899 5900 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) { 5901 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses); 5902 } 5903 5904 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) { 5905 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors); 5906 } 5907 5908 // Free interfaces 5909 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 5910 _local_interfaces, _transitive_interfaces); 5911 5912 if (_combined_annotations != nullptr) { 5913 // After all annotations arrays have been created, they are installed into the 5914 // Annotations object that will be assigned to the InstanceKlass being created. 5915 5916 // Deallocate the Annotations object and the installed annotations arrays. 5917 _combined_annotations->deallocate_contents(_loader_data); 5918 5919 // If the _combined_annotations pointer is non-null, 5920 // then the other annotations fields should have been cleared. 5921 assert(_class_annotations == nullptr, "Should have been cleared"); 5922 assert(_class_type_annotations == nullptr, "Should have been cleared"); 5923 assert(_fields_annotations == nullptr, "Should have been cleared"); 5924 assert(_fields_type_annotations == nullptr, "Should have been cleared"); 5925 } else { 5926 // If the annotations arrays were not installed into the Annotations object, 5927 // then they have to be deallocated explicitly. 5928 MetadataFactory::free_array<u1>(_loader_data, _class_annotations); 5929 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations); 5930 Annotations::free_contents(_loader_data, _fields_annotations); 5931 Annotations::free_contents(_loader_data, _fields_type_annotations); 5932 } 5933 5934 clear_class_metadata(); 5935 _transitive_interfaces = nullptr; 5936 _local_interfaces = nullptr; 5937 5938 // deallocate the klass if already created. Don't directly deallocate, but add 5939 // to the deallocate list so that the klass is removed from the CLD::_klasses list 5940 // at a safepoint. 5941 if (_klass_to_deallocate != nullptr) { 5942 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 5943 } 5944 } 5945 5946 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 5947 TRAPS) { 5948 5949 assert(stream != nullptr, "invariant"); 5950 assert(_class_name != nullptr, "invariant"); 5951 5952 // BEGIN STREAM PARSING 5953 stream->guarantee_more(8, CHECK); // magic, major, minor 5954 // Magic value 5955 const u4 magic = stream->get_u4_fast(); 5956 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 5957 "Incompatible magic value %u in class file %s", 5958 magic, CHECK); 5959 5960 // Version numbers 5961 _minor_version = stream->get_u2_fast(); 5962 _major_version = stream->get_u2_fast(); 5963 5964 // Check version numbers - we check this even with verifier off 5965 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 5966 5967 stream->guarantee_more(3, CHECK); // length, first cp tag 5968 u2 cp_size = stream->get_u2_fast(); 5969 5970 guarantee_property( 5971 cp_size >= 1, "Illegal constant pool size %u in class file %s", 5972 cp_size, CHECK); 5973 5974 _orig_cp_size = cp_size; 5975 if (is_hidden()) { // Add a slot for hidden class name. 5976 guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK); 5977 cp_size++; 5978 } 5979 5980 _cp = ConstantPool::allocate(_loader_data, 5981 cp_size, 5982 CHECK); 5983 5984 ConstantPool* const cp = _cp; 5985 5986 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 5987 5988 assert(cp_size == (u2)cp->length(), "invariant"); 5989 5990 // ACCESS FLAGS 5991 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 5992 5993 // Access flags 5994 u2 flags; 5995 // JVM_ACC_MODULE is defined in JDK-9 and later. 5996 if (_major_version >= JAVA_9_VERSION) { 5997 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 5998 } else { 5999 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 6000 } 6001 6002 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6003 // Set abstract bit for old class files for backward compatibility 6004 flags |= JVM_ACC_ABSTRACT; 6005 } 6006 6007 // Fixing ACC_SUPER/ACC_IDENTITY for old class files 6008 if (!supports_inline_types()) { 6009 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 6010 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 6011 if (!is_module && !is_interface) { 6012 flags |= JVM_ACC_IDENTITY; 6013 } 6014 } 6015 6016 verify_legal_class_modifiers(flags, nullptr, false, CHECK); 6017 6018 short bad_constant = class_bad_constant_seen(); 6019 if (bad_constant != 0) { 6020 // Do not throw CFE until after the access_flags are checked because if 6021 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6022 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD); 6023 return; 6024 } 6025 6026 _access_flags.set_flags(flags); 6027 6028 // This class and superclass 6029 _this_class_index = stream->get_u2_fast(); 6030 guarantee_property( 6031 valid_cp_range(_this_class_index, cp_size) && 6032 cp->tag_at(_this_class_index).is_unresolved_klass(), 6033 "Invalid this class index %u in constant pool in class file %s", 6034 _this_class_index, CHECK); 6035 6036 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6037 assert(class_name_in_cp != nullptr, "class_name can't be null"); 6038 6039 // Don't need to check whether this class name is legal or not. 6040 // It has been checked when constant pool is parsed. 6041 // However, make sure it is not an array type. 6042 if (_need_verify) { 6043 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY, 6044 "Bad class name in class file %s", 6045 CHECK); 6046 } 6047 6048 #ifdef ASSERT 6049 // Basic sanity checks 6050 if (_is_hidden) { 6051 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name"); 6052 } 6053 #endif 6054 6055 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class. 6056 6057 if (_is_hidden) { 6058 assert(_class_name != nullptr, "Unexpected null _class_name"); 6059 #ifdef ASSERT 6060 if (_need_verify) { 6061 verify_legal_class_name(_class_name, CHECK); 6062 } 6063 #endif 6064 6065 } else { 6066 // Check if name in class file matches given name 6067 if (_class_name != class_name_in_cp) { 6068 if (_class_name != vmSymbols::unknown_class_name()) { 6069 ResourceMark rm(THREAD); 6070 // Names are all known to be < 64k so we know this formatted message is not excessively large. 6071 Exceptions::fthrow(THREAD_AND_LOCATION, 6072 vmSymbols::java_lang_NoClassDefFoundError(), 6073 "%s (wrong name: %s)", 6074 _class_name->as_C_string(), 6075 class_name_in_cp->as_C_string() 6076 ); 6077 return; 6078 } else { 6079 // The class name was not known by the caller so we set it from 6080 // the value in the CP. 6081 update_class_name(class_name_in_cp); 6082 } 6083 // else nothing to do: the expected class name matches what is in the CP 6084 } 6085 } 6086 6087 // Verification prevents us from creating names with dots in them, this 6088 // asserts that that's the case. 6089 assert(is_internal_format(_class_name), "external class name format used internally"); 6090 6091 if (!is_internal()) { 6092 LogTarget(Debug, class, preorder) lt; 6093 if (lt.is_enabled()){ 6094 ResourceMark rm(THREAD); 6095 LogStream ls(lt); 6096 ls.print("%s", _class_name->as_klass_external_name()); 6097 if (stream->source() != nullptr) { 6098 ls.print(" source: %s", stream->source()); 6099 } 6100 ls.cr(); 6101 } 6102 } 6103 6104 // SUPERKLASS 6105 _super_class_index = stream->get_u2_fast(); 6106 check_super_class(cp, 6107 _super_class_index, 6108 _need_verify, 6109 CHECK); 6110 6111 // Interfaces 6112 _itfs_len = stream->get_u2_fast(); 6113 parse_interfaces(stream, 6114 _itfs_len, 6115 cp, 6116 &_has_nonstatic_concrete_methods, 6117 CHECK); 6118 6119 assert(_local_interfaces != nullptr, "invariant"); 6120 6121 // Fields (offsets are filled in later) 6122 parse_fields(stream, 6123 _access_flags, 6124 cp, 6125 cp_size, 6126 &_java_fields_count, 6127 CHECK); 6128 6129 assert(_temp_field_info != nullptr, "invariant"); 6130 6131 // Methods 6132 parse_methods(stream, 6133 _access_flags.is_interface(), 6134 &_has_localvariable_table, 6135 &_has_final_method, 6136 &_declares_nonstatic_concrete_methods, 6137 CHECK); 6138 6139 assert(_methods != nullptr, "invariant"); 6140 6141 if (_declares_nonstatic_concrete_methods) { 6142 _has_nonstatic_concrete_methods = true; 6143 } 6144 6145 // Additional attributes/annotations 6146 _parsed_annotations = new ClassAnnotationCollector(); 6147 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6148 6149 assert(_inner_classes != nullptr, "invariant"); 6150 6151 // Finalize the Annotations metadata object, 6152 // now that all annotation arrays have been created. 6153 create_combined_annotations(CHECK); 6154 6155 // Make sure this is the end of class file stream 6156 guarantee_property(stream->at_eos(), 6157 "Extra bytes at the end of class file %s", 6158 CHECK); 6159 6160 // all bytes in stream read and parsed 6161 } 6162 6163 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) { 6164 ResourceMark rm; 6165 // Construct hidden name from _class_name, "+", and &ik. Note that we can't 6166 // use a '/' because that confuses finding the class's package. Also, can't 6167 // use an illegal char such as ';' because that causes serialization issues 6168 // and issues with hidden classes that create their own hidden classes. 6169 char addr_buf[20]; 6170 if (CDSConfig::is_dumping_static_archive()) { 6171 // We want stable names for the archived hidden classes (only for static 6172 // archive for now). Spaces under default_SharedBaseAddress() will be 6173 // occupied by the archive at run time, so we know that no dynamically 6174 // loaded InstanceKlass will be placed under there. 6175 static volatile size_t counter = 0; 6176 AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it 6177 size_t new_id = AtomicAccess::add(&counter, (size_t)1); 6178 jio_snprintf(addr_buf, 20, "0x%zx", new_id); 6179 } else { 6180 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik)); 6181 } 6182 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf); 6183 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len); 6184 jio_snprintf(new_name, new_name_len, "%s+%s", 6185 _class_name->as_C_string(), addr_buf); 6186 update_class_name(SymbolTable::new_symbol(new_name)); 6187 6188 // Add a Utf8 entry containing the hidden name. 6189 assert(_class_name != nullptr, "Unexpected null _class_name"); 6190 int hidden_index = _orig_cp_size; // this is an extra slot we added 6191 _cp->symbol_at_put(hidden_index, _class_name); 6192 6193 // Update this_class_index's slot in the constant pool with the new Utf8 entry. 6194 // We have to update the resolved_klass_index and the name_index together 6195 // so extract the existing resolved_klass_index first. 6196 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index); 6197 int resolved_klass_index = cp_klass_slot.resolved_klass_index(); 6198 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index); 6199 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size, 6200 "Bad name_index"); 6201 } 6202 6203 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6204 ConstantPool* cp, 6205 TRAPS) { 6206 assert(stream != nullptr, "invariant"); 6207 assert(stream->at_eos(), "invariant"); 6208 assert(cp != nullptr, "invariant"); 6209 assert(_loader_data != nullptr, "invariant"); 6210 6211 if (_class_name == vmSymbols::java_lang_Object()) { 6212 precond(_super_class_index == 0); 6213 precond(_super_klass == nullptr); 6214 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6215 "java.lang.Object cannot implement an interface in class file %s", 6216 CHECK); 6217 } else { 6218 // Set _super_klass after class file is parsed and format is checked 6219 assert(_super_class_index > 0, "any class other than Object must have a super class"); 6220 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6221 if (_access_flags.is_interface()) { 6222 // Before attempting to resolve the superclass, check for class format 6223 // errors not checked yet. 6224 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6225 "Interfaces must have java.lang.Object as superclass in class file %s", 6226 CHECK); 6227 } 6228 Handle loader(THREAD, _loader_data->class_loader()); 6229 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) { 6230 // fast path to avoid lookup 6231 _super_klass = vmClasses::Object_klass(); 6232 } else { 6233 _super_klass = (const InstanceKlass*) 6234 SystemDictionary::resolve_super_or_fail(_class_name, 6235 super_class_name, 6236 loader, 6237 true, 6238 CHECK); 6239 } 6240 } 6241 6242 if (_super_klass != nullptr) { 6243 if (_super_klass->is_interface()) { 6244 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD); 6245 return; 6246 } 6247 6248 if (_super_klass->is_final()) { 6249 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD); 6250 return; 6251 } 6252 6253 if (Arguments::is_valhalla_enabled()) { 6254 // If this class is a value class, its super class cannot be an identity class unless it is java.lang.Object. 6255 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() && 6256 _super_klass != vmClasses::Object_klass()) { 6257 ResourceMark rm(THREAD); 6258 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 6259 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string())); 6260 } 6261 } 6262 6263 if (_super_klass->has_nonstatic_concrete_methods()) { 6264 _has_nonstatic_concrete_methods = true; 6265 } 6266 } 6267 6268 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) { 6269 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), 6270 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class", 6271 _class_name->as_klass_external_name())); 6272 } 6273 6274 // Determining if the class allows tearing or not (default is not) 6275 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) { 6276 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue) 6277 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) { 6278 // Conditions above are not sufficient to determine atomicity requirements. 6279 // Fields with atomicity requirements could force the current class to have atomicity requirements too. 6280 // Mark as not needing atomicity for now - can be updated when computing the fields layout. 6281 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by 6282 // the FieldLayoutBuilder, not with this _must_be_atomic field. 6283 _must_be_atomic = false; 6284 } 6285 // Apply VM options override 6286 if (*ForceNonTearable != '\0') { 6287 // Allow a command line switch to force the same atomicity property: 6288 ResourceMark rm(THREAD); 6289 const char* class_name_str = _class_name->as_C_string(); 6290 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) { 6291 _must_be_atomic = true; 6292 } 6293 } 6294 } 6295 6296 // Compute the transitive list of all unique interfaces implemented by this class 6297 _transitive_interfaces = 6298 compute_transitive_interfaces(_super_klass, 6299 _local_interfaces, 6300 _loader_data, 6301 CHECK); 6302 6303 assert(_transitive_interfaces != nullptr, "invariant"); 6304 6305 // sort methods 6306 _method_ordering = sort_methods(_methods); 6307 6308 _all_mirandas = new GrowableArray<Method*>(20); 6309 6310 Handle loader(THREAD, _loader_data->class_loader()); 6311 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6312 &_num_miranda_methods, 6313 _all_mirandas, 6314 _super_klass, 6315 _methods, 6316 _access_flags, 6317 _major_version, 6318 loader, 6319 _class_name, 6320 _local_interfaces); 6321 6322 // Size of Java itable (in words) 6323 _itable_size = is_interface() ? 0 : 6324 klassItable::compute_itable_size(_transitive_interfaces); 6325 6326 assert(_parsed_annotations != nullptr, "invariant"); 6327 6328 if (Arguments::is_valhalla_enabled()) { 6329 fetch_field_classes(cp, CHECK); 6330 } 6331 6332 _layout_info = new FieldLayoutInfo(); 6333 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info, 6334 _parsed_annotations->is_contended(), is_inline_type(), 6335 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(), 6336 _must_be_atomic, _layout_info, _inline_layout_info_array); 6337 lb.build_layout(); 6338 6339 // If it turned out that we didn't inline any of the fields, we deallocate 6340 // the array of InlineLayoutInfo since it isn't needed, and so it isn't 6341 // transferred to the allocated InstanceKlass. 6342 if (_inline_layout_info_array != nullptr && !(_layout_info->_has_inlined_fields || _has_null_restricted_static_fields)) { 6343 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array); 6344 _inline_layout_info_array = nullptr; 6345 } 6346 6347 int injected_fields_count = _temp_field_info->length() - _java_fields_count; 6348 _fieldinfo_stream = 6349 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count, 6350 injected_fields_count, loader_data(), CHECK); 6351 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK); 6352 _fields_status = 6353 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(), 6354 FieldStatus(0), CHECK); 6355 6356 // Strict static fields track initialization status from the beginning of time. 6357 // After this class runs <clinit>, they will be verified as being "not unset". 6358 // See Step 8 of InstanceKlass::initialize_impl. 6359 if (_has_strict_static_fields) { 6360 bool found_one = false; 6361 for (int i = 0; i < _temp_field_info->length(); i++) { 6362 FieldInfo& fi = *_temp_field_info->adr_at(i); 6363 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) { 6364 found_one = true; 6365 if (fi.initializer_index() != 0) { 6366 // skip strict static fields with ConstantValue attributes 6367 } else { 6368 _fields_status->adr_at(fi.index())->update_strict_static_unset(true); 6369 _fields_status->adr_at(fi.index())->update_strict_static_unread(true); 6370 } 6371 } 6372 } 6373 assert(found_one == _has_strict_static_fields, 6374 "correct prediction = %d", (int)_has_strict_static_fields); 6375 } 6376 } 6377 6378 // In order to be able to optimize field layouts by applying heap flattening, 6379 // the JVM needs to know the layout of the class of the fields, which implies 6380 // having these classes loaded. The strategy has two folds: 6381 // 1 - if the current class has a LoadableDescriptors attribute containing the 6382 // name of the class of the field and PreloadClasses is true, the JVM will 6383 // try to speculatively load this class. Failures to load the class are 6384 // silently discarded, and loads resulting in a non-optimizable class 6385 // are ignored 6386 // 2 - if step 1 cannot be applied, the JVM will simply check if the class 6387 // loader of the current class already knows these classes (no class 6388 // loading triggered in this case). Note that the migrated value classes 6389 // of the JDK are automatically registered to all class loaders, and 6390 // are guaranteed to be found in this step even if the current class 6391 // has not been recompiled with JEP 401 features enabled 6392 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) { 6393 for (int i = 0; i < _temp_field_info->length(); i++) { 6394 FieldInfo& fieldinfo = _temp_field_info->at(i); 6395 if (fieldinfo.access_flags().is_static() && !fieldinfo.field_flags().is_null_free_inline_type()) continue; 6396 Symbol* sig = fieldinfo.signature(cp); 6397 if (Signature::has_envelope(sig)) { 6398 TempNewSymbol name = Signature::strip_envelope(sig); 6399 if (name == _class_name) { 6400 if (fieldinfo.field_flags().is_null_free_inline_type() && !is_inline_type()) { 6401 fieldinfo.field_flags_addr()->update_null_free_inline_type(false); 6402 } else { 6403 // Dummy setting to trigger the allocation of the inline_layout_info array - 6404 // the real pointer will be set later in ::fill_instance_klass, once the InlineKlass has been allocated. 6405 set_inline_layout_info_klass(fieldinfo.index(), nullptr, CHECK); 6406 } 6407 continue; 6408 } 6409 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) { 6410 ResourceMark rm(THREAD); 6411 log_info(class, preload)("Preloading of class %s during loading of class %s. " 6412 "Cause: field type in LoadableDescriptors attribute", 6413 name->as_C_string(), _class_name->as_C_string()); 6414 oop loader = loader_data()->class_loader(); 6415 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name, 6416 Handle(THREAD, loader), 6417 false, THREAD); 6418 6419 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same"); 6420 6421 if (klass != nullptr) { 6422 if (klass->is_inline_klass()) { 6423 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK); 6424 log_info(class, preload)("Preloading of class %s during loading of class %s " 6425 "(cause: field type in LoadableDescriptors attribute) succeeded", 6426 name->as_C_string(), _class_name->as_C_string()); 6427 } else { 6428 // Non value classes are allowed by the current spec, but it could be an indication of an issue so let's log this 6429 log_info(class, preload)("Preloading of class %s during loading of class %s " 6430 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class", 6431 name->as_C_string(), _class_name->as_C_string()); 6432 if (fieldinfo.field_flags().is_null_free_inline_type()) { 6433 log_warning(class, preload)("After preloading of class %s during loading of class %s " 6434 "field was annotated with @NullRestricted but loaded class is not a value class, " 6435 "the annotation is ignored", 6436 name->as_C_string(), _class_name->as_C_string()); 6437 fieldinfo.field_flags_addr()->update_null_free_inline_type(false); 6438 } 6439 } 6440 } else { 6441 log_info(class, preload)("Preloading of class %s during loading of class %s " 6442 "(cause: field type in LoadableDescriptors attribute) failed : %s", 6443 name->as_C_string(), _class_name->as_C_string(), 6444 PENDING_EXCEPTION->klass()->name()->as_C_string()); 6445 if (fieldinfo.field_flags().is_null_free_inline_type()) { 6446 log_warning(class, preload)("After preloading of class %s during loading of class %s failed," 6447 "field was annotated with @NullRestricted but class is unknown, " 6448 "the annotation is ignored", 6449 name->as_C_string(), _class_name->as_C_string()); 6450 fieldinfo.field_flags_addr()->update_null_free_inline_type(false); 6451 } 6452 6453 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not 6454 // impact loading of current class. 6455 CLEAR_PENDING_EXCEPTION; 6456 } 6457 } else { 6458 oop loader = loader_data()->class_loader(); 6459 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader)); 6460 if (klass != nullptr && klass->is_inline_klass()) { 6461 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK); 6462 ResourceMark rm(THREAD); 6463 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary" 6464 "(field type not in LoadableDescriptors attribute)", 6465 _class_name->as_C_string(), name->as_C_string()); 6466 } else if (fieldinfo.field_flags().is_null_free_inline_type()) { 6467 ResourceMark rm(THREAD); 6468 if (klass == nullptr) { 6469 log_warning(class, preload)("During loading of class %s, class %s is unknown, " 6470 "but a field of this type was annotated with @NullRestricted, " 6471 "the annotation is ignored", 6472 _class_name->as_C_string(), name->as_C_string()); 6473 } else { 6474 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary " 6475 "and is not a concrete value class, but a field of this type was annotated with " 6476 "@NullRestricted, the annotation is ignored", 6477 _class_name->as_C_string(), name->as_C_string()); 6478 } 6479 fieldinfo.field_flags_addr()->update_null_free_inline_type(false); 6480 } 6481 } 6482 } 6483 } 6484 } 6485 6486 void ClassFileParser::set_klass(InstanceKlass* klass) { 6487 6488 #ifdef ASSERT 6489 if (klass != nullptr) { 6490 assert(nullptr == _klass, "leaking?"); 6491 } 6492 #endif 6493 6494 _klass = klass; 6495 } 6496 6497 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) { 6498 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count()); 6499 6500 // The array of InlineLayoutInfo is allocated on demand. This way the array is 6501 // never allocated for an InstanceKlass which has no need for this information. 6502 if (_inline_layout_info_array == nullptr) { 6503 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data, 6504 java_fields_count(), 6505 CHECK); 6506 } 6507 6508 // Set the Klass for the field's index 6509 _inline_layout_info_array->adr_at(field_index)->set_klass(ik); 6510 } 6511 6512 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6513 6514 #ifdef ASSERT 6515 if (klass != nullptr) { 6516 assert(nullptr == _klass_to_deallocate, "leaking?"); 6517 } 6518 #endif 6519 6520 _klass_to_deallocate = klass; 6521 } 6522 6523 // Caller responsible for ResourceMark 6524 // clone stream with rewound position 6525 const ClassFileStream* ClassFileParser::clone_stream() const { 6526 assert(_stream != nullptr, "invariant"); 6527 6528 return _stream->clone(); 6529 } 6530 6531 ReferenceType ClassFileParser::super_reference_type() const { 6532 return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type(); 6533 } 6534 6535 bool ClassFileParser::is_instance_ref_klass() const { 6536 // Only the subclasses of j.l.r.Reference are InstanceRefKlass. 6537 // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a 6538 // klass requiring special treatment in ref-processing. The abstract 6539 // j.l.r.Reference cannot be instantiated so doesn't partake in 6540 // ref-processing. 6541 return is_java_lang_ref_Reference_subclass(); 6542 } 6543 6544 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const { 6545 if (_super_klass == nullptr) { 6546 return false; 6547 } 6548 6549 if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) { 6550 // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom 6551 return true; 6552 } 6553 6554 return _super_klass->reference_type() != REF_NONE; 6555 } 6556 6557 // ---------------------------------------------------------------------------- 6558 // debugging 6559 6560 #ifdef ASSERT 6561 6562 // return true if class_name contains no '.' (internal format is '/') 6563 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6564 if (class_name != nullptr) { 6565 ResourceMark rm; 6566 char* name = class_name->as_C_string(); 6567 return strchr(name, JVM_SIGNATURE_DOT) == nullptr; 6568 } else { 6569 return true; 6570 } 6571 } 6572 6573 #endif --- EOF ---