1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classFileParser.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/classLoadInfo.hpp" 32 #include "classfile/defaultMethods.hpp" 33 #include "classfile/fieldLayoutBuilder.hpp" 34 #include "classfile/javaClasses.inline.hpp" 35 #include "classfile/moduleEntry.hpp" 36 #include "classfile/packageEntry.hpp" 37 #include "classfile/symbolTable.hpp" 38 #include "classfile/systemDictionary.hpp" 39 #include "classfile/verificationType.hpp" 40 #include "classfile/verifier.hpp" 41 #include "classfile/vmClasses.hpp" 42 #include "classfile/vmSymbols.hpp" 43 #include "logging/log.hpp" 44 #include "logging/logStream.hpp" 45 #include "memory/allocation.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/resourceArea.hpp" 49 #include "memory/universe.hpp" 50 #include "oops/annotations.hpp" 51 #include "oops/constantPool.inline.hpp" 52 #include "oops/fieldStreams.inline.hpp" 53 #include "oops/inlineKlass.inline.hpp" 54 #include "oops/instanceKlass.inline.hpp" 55 #include "oops/instanceMirrorKlass.hpp" 56 #include "oops/klass.inline.hpp" 57 #include "oops/klassVtable.hpp" 58 #include "oops/metadata.hpp" 59 #include "oops/method.inline.hpp" 60 #include "oops/oop.inline.hpp" 61 #include "oops/recordComponent.hpp" 62 #include "oops/symbol.hpp" 63 #include "prims/jvmtiExport.hpp" 64 #include "prims/jvmtiThreadState.hpp" 65 #include "runtime/arguments.hpp" 66 #include "runtime/fieldDescriptor.inline.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/javaCalls.hpp" 69 #include "runtime/os.hpp" 70 #include "runtime/perfData.hpp" 71 #include "runtime/reflection.hpp" 72 #include "runtime/safepointVerifiers.hpp" 73 #include "runtime/signature.hpp" 74 #include "runtime/timer.hpp" 75 #include "services/classLoadingService.hpp" 76 #include "services/threadService.hpp" 77 #include "utilities/align.hpp" 78 #include "utilities/bitMap.inline.hpp" 79 #include "utilities/copy.hpp" 80 #include "utilities/formatBuffer.hpp" 81 #include "utilities/exceptions.hpp" 82 #include "utilities/globalDefinitions.hpp" 83 #include "utilities/growableArray.hpp" 84 #include "utilities/macros.hpp" 85 #include "utilities/ostream.hpp" 86 #include "utilities/resourceHash.hpp" 87 #include "utilities/stringUtils.hpp" 88 #include "utilities/utf8.hpp" 89 90 #if INCLUDE_CDS 91 #include "classfile/systemDictionaryShared.hpp" 92 #endif 93 #if INCLUDE_JFR 94 #include "jfr/support/jfrTraceIdExtension.hpp" 95 #endif 96 97 // We generally try to create the oops directly when parsing, rather than 98 // allocating temporary data structures and copying the bytes twice. A 99 // temporary area is only needed when parsing utf8 entries in the constant 100 // pool and when parsing line number tables. 101 102 // We add assert in debug mode when class format is not checked. 103 104 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 105 #define JAVA_MIN_SUPPORTED_VERSION 45 106 #define JAVA_PREVIEW_MINOR_VERSION 65535 107 108 // Used for two backward compatibility reasons: 109 // - to check for new additions to the class file format in JDK1.5 110 // - to check for bug fixes in the format checker in JDK1.5 111 #define JAVA_1_5_VERSION 49 112 113 // Used for backward compatibility reasons: 114 // - to check for javac bug fixes that happened after 1.5 115 // - also used as the max version when running in jdk6 116 #define JAVA_6_VERSION 50 117 118 // Used for backward compatibility reasons: 119 // - to disallow argument and require ACC_STATIC for <clinit> methods 120 #define JAVA_7_VERSION 51 121 122 // Extension method support. 123 #define JAVA_8_VERSION 52 124 125 #define JAVA_9_VERSION 53 126 127 #define JAVA_10_VERSION 54 128 129 #define JAVA_11_VERSION 55 130 131 #define JAVA_12_VERSION 56 132 133 #define JAVA_13_VERSION 57 134 135 #define JAVA_14_VERSION 58 136 137 #define JAVA_15_VERSION 59 138 139 #define JAVA_16_VERSION 60 140 141 #define JAVA_17_VERSION 61 142 143 #define JAVA_18_VERSION 62 144 145 #define JAVA_19_VERSION 63 146 147 #define CONSTANT_CLASS_DESCRIPTORS 63 148 149 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 150 assert((bad_constant == JVM_CONSTANT_Module || 151 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION, 152 "Unexpected bad constant pool entry"); 153 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 154 } 155 156 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 157 ConstantPool* cp, 158 const int length, 159 TRAPS) { 160 assert(stream != NULL, "invariant"); 161 assert(cp != NULL, "invariant"); 162 163 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 164 // this function (_current can be allocated in a register, with scalar 165 // replacement of aggregates). The _current pointer is copied back to 166 // stream() when this function returns. DON'T call another method within 167 // this method that uses stream(). 168 const ClassFileStream cfs1 = *stream; 169 const ClassFileStream* const cfs = &cfs1; 170 171 assert(cfs->allocated_on_stack_or_embedded(), "should be local"); 172 debug_only(const u1* const old_current = stream->current();) 173 174 // Used for batching symbol allocations. 175 const char* names[SymbolTable::symbol_alloc_batch_size]; 176 int lengths[SymbolTable::symbol_alloc_batch_size]; 177 int indices[SymbolTable::symbol_alloc_batch_size]; 178 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 179 int names_count = 0; 180 181 // parsing Index 0 is unused 182 for (int index = 1; index < length; index++) { 183 // Each of the following case guarantees one more byte in the stream 184 // for the following tag or the access_flags following constant pool, 185 // so we don't need bounds-check for reading tag. 186 const u1 tag = cfs->get_u1_fast(); 187 switch (tag) { 188 case JVM_CONSTANT_Class: { 189 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 190 const u2 name_index = cfs->get_u2_fast(); 191 cp->klass_index_at_put(index, name_index); 192 break; 193 } 194 case JVM_CONSTANT_Fieldref: { 195 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 196 const u2 class_index = cfs->get_u2_fast(); 197 const u2 name_and_type_index = cfs->get_u2_fast(); 198 cp->field_at_put(index, class_index, name_and_type_index); 199 break; 200 } 201 case JVM_CONSTANT_Methodref: { 202 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 203 const u2 class_index = cfs->get_u2_fast(); 204 const u2 name_and_type_index = cfs->get_u2_fast(); 205 cp->method_at_put(index, class_index, name_and_type_index); 206 break; 207 } 208 case JVM_CONSTANT_InterfaceMethodref: { 209 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 210 const u2 class_index = cfs->get_u2_fast(); 211 const u2 name_and_type_index = cfs->get_u2_fast(); 212 cp->interface_method_at_put(index, class_index, name_and_type_index); 213 break; 214 } 215 case JVM_CONSTANT_String : { 216 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 217 const u2 string_index = cfs->get_u2_fast(); 218 cp->string_index_at_put(index, string_index); 219 break; 220 } 221 case JVM_CONSTANT_MethodHandle : 222 case JVM_CONSTANT_MethodType: { 223 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 224 classfile_parse_error( 225 "Class file version does not support constant tag %u in class file %s", 226 tag, THREAD); 227 return; 228 } 229 if (tag == JVM_CONSTANT_MethodHandle) { 230 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 231 const u1 ref_kind = cfs->get_u1_fast(); 232 const u2 method_index = cfs->get_u2_fast(); 233 cp->method_handle_index_at_put(index, ref_kind, method_index); 234 } 235 else if (tag == JVM_CONSTANT_MethodType) { 236 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 237 const u2 signature_index = cfs->get_u2_fast(); 238 cp->method_type_index_at_put(index, signature_index); 239 } 240 else { 241 ShouldNotReachHere(); 242 } 243 break; 244 } 245 case JVM_CONSTANT_Dynamic : { 246 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 247 classfile_parse_error( 248 "Class file version does not support constant tag %u in class file %s", 249 tag, THREAD); 250 return; 251 } 252 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 253 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 254 const u2 name_and_type_index = cfs->get_u2_fast(); 255 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 256 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 257 } 258 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 259 break; 260 } 261 case JVM_CONSTANT_InvokeDynamic : { 262 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 263 classfile_parse_error( 264 "Class file version does not support constant tag %u in class file %s", 265 tag, THREAD); 266 return; 267 } 268 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 269 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 270 const u2 name_and_type_index = cfs->get_u2_fast(); 271 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 272 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 273 } 274 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 275 break; 276 } 277 case JVM_CONSTANT_Integer: { 278 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 279 const u4 bytes = cfs->get_u4_fast(); 280 cp->int_at_put(index, (jint)bytes); 281 break; 282 } 283 case JVM_CONSTANT_Float: { 284 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 285 const u4 bytes = cfs->get_u4_fast(); 286 cp->float_at_put(index, *(jfloat*)&bytes); 287 break; 288 } 289 case JVM_CONSTANT_Long: { 290 // A mangled type might cause you to overrun allocated memory 291 guarantee_property(index + 1 < length, 292 "Invalid constant pool entry %u in class file %s", 293 index, 294 CHECK); 295 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 296 const u8 bytes = cfs->get_u8_fast(); 297 cp->long_at_put(index, bytes); 298 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 299 break; 300 } 301 case JVM_CONSTANT_Double: { 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->double_at_put(index, *(jdouble*)&bytes); 310 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 311 break; 312 } 313 case JVM_CONSTANT_NameAndType: { 314 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 315 const u2 name_index = cfs->get_u2_fast(); 316 const u2 signature_index = cfs->get_u2_fast(); 317 cp->name_and_type_at_put(index, name_index, signature_index); 318 break; 319 } 320 case JVM_CONSTANT_Utf8 : { 321 cfs->guarantee_more(2, CHECK); // utf8_length 322 u2 utf8_length = cfs->get_u2_fast(); 323 const u1* utf8_buffer = cfs->current(); 324 assert(utf8_buffer != NULL, "null utf8 buffer"); 325 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 326 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 327 cfs->skip_u1_fast(utf8_length); 328 329 // Before storing the symbol, make sure it's legal 330 if (_need_verify) { 331 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 332 } 333 334 unsigned int hash; 335 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 336 utf8_length, 337 hash); 338 if (result == NULL) { 339 names[names_count] = (const char*)utf8_buffer; 340 lengths[names_count] = utf8_length; 341 indices[names_count] = index; 342 hashValues[names_count++] = hash; 343 if (names_count == SymbolTable::symbol_alloc_batch_size) { 344 SymbolTable::new_symbols(_loader_data, 345 constantPoolHandle(THREAD, cp), 346 names_count, 347 names, 348 lengths, 349 indices, 350 hashValues); 351 names_count = 0; 352 } 353 } else { 354 cp->symbol_at_put(index, result); 355 } 356 break; 357 } 358 case JVM_CONSTANT_Module: 359 case JVM_CONSTANT_Package: { 360 // Record that an error occurred in these two cases but keep parsing so 361 // that ACC_Module can be checked for in the access_flags. Need to 362 // throw NoClassDefFoundError in that case. 363 if (_major_version >= JAVA_9_VERSION) { 364 cfs->guarantee_more(3, CHECK); 365 cfs->get_u2_fast(); 366 set_class_bad_constant_seen(tag); 367 break; 368 } 369 } 370 default: { 371 classfile_parse_error("Unknown constant tag %u in class file %s", 372 tag, 373 THREAD); 374 return; 375 } 376 } // end of switch(tag) 377 } // end of for 378 379 // Allocate the remaining symbols 380 if (names_count > 0) { 381 SymbolTable::new_symbols(_loader_data, 382 constantPoolHandle(THREAD, cp), 383 names_count, 384 names, 385 lengths, 386 indices, 387 hashValues); 388 } 389 390 // Copy _current pointer of local copy back to stream. 391 assert(stream->current() == old_current, "non-exclusive use of stream"); 392 stream->set_current(cfs1.current()); 393 394 } 395 396 static inline bool valid_cp_range(int index, int length) { 397 return (index > 0 && index < length); 398 } 399 400 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 401 assert(cp != NULL, "invariant"); 402 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 403 return cp->symbol_at(index); 404 } 405 return NULL; 406 } 407 408 #ifdef ASSERT 409 PRAGMA_DIAG_PUSH 410 PRAGMA_FORMAT_NONLITERAL_IGNORED 411 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 412 ResourceMark rm(THREAD); 413 fatal(msg, _class_name->as_C_string()); 414 } 415 416 void ClassFileParser::report_assert_property_failure(const char* msg, 417 int index, 418 TRAPS) const { 419 ResourceMark rm(THREAD); 420 fatal(msg, index, _class_name->as_C_string()); 421 } 422 PRAGMA_DIAG_POP 423 #endif 424 425 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 426 ConstantPool* const cp, 427 const int length, 428 TRAPS) { 429 assert(cp != NULL, "invariant"); 430 assert(stream != NULL, "invariant"); 431 432 // parsing constant pool entries 433 parse_constant_pool_entries(stream, cp, length, CHECK); 434 if (class_bad_constant_seen() != 0) { 435 // a bad CP entry has been detected previously so stop parsing and just return. 436 return; 437 } 438 439 int index = 1; // declared outside of loops for portability 440 int num_klasses = 0; 441 442 // first verification pass - validate cross references 443 // and fixup class and string constants 444 for (index = 1; index < length; index++) { // Index 0 is unused 445 const jbyte tag = cp->tag_at(index).value(); 446 switch (tag) { 447 case JVM_CONSTANT_Class: { 448 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 449 break; 450 } 451 case JVM_CONSTANT_Fieldref: 452 // fall through 453 case JVM_CONSTANT_Methodref: 454 // fall through 455 case JVM_CONSTANT_InterfaceMethodref: { 456 if (!_need_verify) break; 457 const int klass_ref_index = cp->klass_ref_index_at(index); 458 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 459 check_property(valid_klass_reference_at(klass_ref_index), 460 "Invalid constant pool index %u in class file %s", 461 klass_ref_index, CHECK); 462 check_property(valid_cp_range(name_and_type_ref_index, length) && 463 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 464 "Invalid constant pool index %u in class file %s", 465 name_and_type_ref_index, CHECK); 466 break; 467 } 468 case JVM_CONSTANT_String: { 469 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 470 break; 471 } 472 case JVM_CONSTANT_Integer: 473 break; 474 case JVM_CONSTANT_Float: 475 break; 476 case JVM_CONSTANT_Long: 477 case JVM_CONSTANT_Double: { 478 index++; 479 check_property( 480 (index < length && cp->tag_at(index).is_invalid()), 481 "Improper constant pool long/double index %u in class file %s", 482 index, CHECK); 483 break; 484 } 485 case JVM_CONSTANT_NameAndType: { 486 if (!_need_verify) break; 487 const int name_ref_index = cp->name_ref_index_at(index); 488 const int signature_ref_index = cp->signature_ref_index_at(index); 489 check_property(valid_symbol_at(name_ref_index), 490 "Invalid constant pool index %u in class file %s", 491 name_ref_index, CHECK); 492 check_property(valid_symbol_at(signature_ref_index), 493 "Invalid constant pool index %u in class file %s", 494 signature_ref_index, CHECK); 495 break; 496 } 497 case JVM_CONSTANT_Utf8: 498 break; 499 case JVM_CONSTANT_UnresolvedClass: // fall-through 500 case JVM_CONSTANT_UnresolvedClassInError: { 501 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 502 break; 503 } 504 case JVM_CONSTANT_ClassIndex: { 505 const int class_index = cp->klass_index_at(index); 506 check_property(valid_symbol_at(class_index), 507 "Invalid constant pool index %u in class file %s", 508 class_index, CHECK); 509 510 Symbol* const name = cp->symbol_at(class_index); 511 const unsigned int name_len = name->utf8_length(); 512 if (name->is_Q_signature()) { 513 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++); 514 } else { 515 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 516 } 517 break; 518 } 519 case JVM_CONSTANT_StringIndex: { 520 const int string_index = cp->string_index_at(index); 521 check_property(valid_symbol_at(string_index), 522 "Invalid constant pool index %u in class file %s", 523 string_index, CHECK); 524 Symbol* const sym = cp->symbol_at(string_index); 525 cp->unresolved_string_at_put(index, sym); 526 break; 527 } 528 case JVM_CONSTANT_MethodHandle: { 529 const int ref_index = cp->method_handle_index_at(index); 530 check_property(valid_cp_range(ref_index, length), 531 "Invalid constant pool index %u in class file %s", 532 ref_index, CHECK); 533 const constantTag tag = cp->tag_at(ref_index); 534 const int ref_kind = cp->method_handle_ref_kind_at(index); 535 536 switch (ref_kind) { 537 case JVM_REF_getField: 538 case JVM_REF_getStatic: 539 case JVM_REF_putField: 540 case JVM_REF_putStatic: { 541 check_property( 542 tag.is_field(), 543 "Invalid constant pool index %u in class file %s (not a field)", 544 ref_index, CHECK); 545 break; 546 } 547 case JVM_REF_invokeVirtual: 548 case JVM_REF_newInvokeSpecial: { 549 check_property( 550 tag.is_method(), 551 "Invalid constant pool index %u in class file %s (not a method)", 552 ref_index, CHECK); 553 break; 554 } 555 case JVM_REF_invokeStatic: 556 case JVM_REF_invokeSpecial: { 557 check_property( 558 tag.is_method() || 559 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 560 "Invalid constant pool index %u in class file %s (not a method)", 561 ref_index, CHECK); 562 break; 563 } 564 case JVM_REF_invokeInterface: { 565 check_property( 566 tag.is_interface_method(), 567 "Invalid constant pool index %u in class file %s (not an interface method)", 568 ref_index, CHECK); 569 break; 570 } 571 default: { 572 classfile_parse_error( 573 "Bad method handle kind at constant pool index %u in class file %s", 574 index, THREAD); 575 return; 576 } 577 } // switch(refkind) 578 // Keep the ref_index unchanged. It will be indirected at link-time. 579 break; 580 } // case MethodHandle 581 case JVM_CONSTANT_MethodType: { 582 const int ref_index = cp->method_type_index_at(index); 583 check_property(valid_symbol_at(ref_index), 584 "Invalid constant pool index %u in class file %s", 585 ref_index, CHECK); 586 break; 587 } 588 case JVM_CONSTANT_Dynamic: { 589 const int name_and_type_ref_index = 590 cp->bootstrap_name_and_type_ref_index_at(index); 591 592 check_property(valid_cp_range(name_and_type_ref_index, length) && 593 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 594 "Invalid constant pool index %u in class file %s", 595 name_and_type_ref_index, CHECK); 596 // bootstrap specifier index must be checked later, 597 // when BootstrapMethods attr is available 598 599 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 600 cp->set_has_dynamic_constant(); 601 break; 602 } 603 case JVM_CONSTANT_InvokeDynamic: { 604 const int name_and_type_ref_index = 605 cp->bootstrap_name_and_type_ref_index_at(index); 606 607 check_property(valid_cp_range(name_and_type_ref_index, length) && 608 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 609 "Invalid constant pool index %u in class file %s", 610 name_and_type_ref_index, CHECK); 611 // bootstrap specifier index must be checked later, 612 // when BootstrapMethods attr is available 613 break; 614 } 615 default: { 616 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 617 ShouldNotReachHere(); 618 break; 619 } 620 } // switch(tag) 621 } // end of for 622 623 cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK); 624 625 if (!_need_verify) { 626 return; 627 } 628 629 // second verification pass - checks the strings are of the right format. 630 // but not yet to the other entries 631 for (index = 1; index < length; index++) { 632 const jbyte tag = cp->tag_at(index).value(); 633 switch (tag) { 634 case JVM_CONSTANT_UnresolvedClass: { 635 const Symbol* const class_name = cp->klass_name_at(index); 636 // check the name 637 verify_legal_class_name(class_name, CHECK); 638 break; 639 } 640 case JVM_CONSTANT_NameAndType: { 641 if (_need_verify) { 642 const int sig_index = cp->signature_ref_index_at(index); 643 const int name_index = cp->name_ref_index_at(index); 644 const Symbol* const name = cp->symbol_at(name_index); 645 const Symbol* const sig = cp->symbol_at(sig_index); 646 guarantee_property(sig->utf8_length() != 0, 647 "Illegal zero length constant pool entry at %d in class %s", 648 sig_index, CHECK); 649 guarantee_property(name->utf8_length() != 0, 650 "Illegal zero length constant pool entry at %d in class %s", 651 name_index, CHECK); 652 653 if (Signature::is_method(sig)) { 654 // Format check method name and signature 655 verify_legal_method_name(name, CHECK); 656 verify_legal_method_signature(name, sig, CHECK); 657 } else { 658 // Format check field name and signature 659 verify_legal_field_name(name, CHECK); 660 verify_legal_field_signature(name, sig, CHECK); 661 } 662 } 663 break; 664 } 665 case JVM_CONSTANT_Dynamic: { 666 const int name_and_type_ref_index = 667 cp->name_and_type_ref_index_at(index); 668 // already verified to be utf8 669 const int name_ref_index = 670 cp->name_ref_index_at(name_and_type_ref_index); 671 // already verified to be utf8 672 const int signature_ref_index = 673 cp->signature_ref_index_at(name_and_type_ref_index); 674 const Symbol* const name = cp->symbol_at(name_ref_index); 675 const Symbol* const signature = cp->symbol_at(signature_ref_index); 676 if (_need_verify) { 677 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 678 // Need only to be sure signature is the right type. 679 if (Signature::is_method(signature)) { 680 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 681 } 682 } 683 break; 684 } 685 case JVM_CONSTANT_InvokeDynamic: 686 case JVM_CONSTANT_Fieldref: 687 case JVM_CONSTANT_Methodref: 688 case JVM_CONSTANT_InterfaceMethodref: { 689 const int name_and_type_ref_index = 690 cp->name_and_type_ref_index_at(index); 691 // already verified to be utf8 692 const int name_ref_index = 693 cp->name_ref_index_at(name_and_type_ref_index); 694 // already verified to be utf8 695 const int signature_ref_index = 696 cp->signature_ref_index_at(name_and_type_ref_index); 697 const Symbol* const name = cp->symbol_at(name_ref_index); 698 const Symbol* const signature = cp->symbol_at(signature_ref_index); 699 if (tag == JVM_CONSTANT_Fieldref) { 700 if (_need_verify) { 701 // Field name and signature are verified above, when iterating NameAndType_info. 702 // Need only to be sure signature is non-zero length and the right type. 703 if (Signature::is_method(signature)) { 704 throwIllegalSignature("Field", name, signature, CHECK); 705 } 706 } 707 } else { 708 if (_need_verify) { 709 // Method name and signature are individually verified above, when iterating 710 // NameAndType_info. Need to check here that signature is non-zero length and 711 // the right type. 712 if (!Signature::is_method(signature)) { 713 throwIllegalSignature("Method", name, signature, CHECK); 714 } 715 } 716 // If a class method name begins with '<', it must be "<init>" and have void signature 717 // unless it's an inline type. 718 const unsigned int name_len = name->utf8_length(); 719 if (tag == JVM_CONSTANT_Methodref && name_len != 0 && 720 name->char_at(0) == JVM_SIGNATURE_SPECIAL) { 721 if (name != vmSymbols::object_initializer_name()) { 722 classfile_parse_error( 723 "Bad method name at constant pool index %u in class file %s", 724 name_ref_index, THREAD); 725 return; 726 } else if (!Signature::is_void_method(signature)) { 727 // if return type is non-void then it cannot be a basic primitive 728 // and primitve types must be supported. 729 if (!signature->ends_with(JVM_SIGNATURE_ENDCLASS) || !EnableValhalla) { 730 throwIllegalSignature("Method", name, signature, CHECK); 731 } 732 } 733 } 734 } 735 break; 736 } 737 case JVM_CONSTANT_MethodHandle: { 738 const int ref_index = cp->method_handle_index_at(index); 739 const int ref_kind = cp->method_handle_ref_kind_at(index); 740 switch (ref_kind) { 741 case JVM_REF_invokeVirtual: 742 case JVM_REF_invokeStatic: 743 case JVM_REF_invokeSpecial: 744 case JVM_REF_newInvokeSpecial: { 745 const int name_and_type_ref_index = 746 cp->name_and_type_ref_index_at(ref_index); 747 const int name_ref_index = 748 cp->name_ref_index_at(name_and_type_ref_index); 749 const Symbol* const name = cp->symbol_at(name_ref_index); 750 if (name != vmSymbols::object_initializer_name()) { 751 if (ref_kind == JVM_REF_newInvokeSpecial) { 752 classfile_parse_error( 753 "Bad constructor name at constant pool index %u in class file %s", 754 name_ref_index, THREAD); 755 return; 756 } 757 } else { 758 // The allowed invocation mode of <init> depends on its signature. 759 // This test corresponds to verify_invoke_instructions in the verifier. 760 const int signature_ref_index = 761 cp->signature_ref_index_at(name_and_type_ref_index); 762 const Symbol* const signature = cp->symbol_at(signature_ref_index); 763 if (signature->is_void_method_signature() 764 && ref_kind == JVM_REF_newInvokeSpecial) { 765 // OK, could be a constructor call 766 } else if (!signature->is_void_method_signature() 767 && ref_kind == JVM_REF_invokeStatic) { 768 // also OK, could be a static factory call 769 } else { 770 classfile_parse_error( 771 "Bad method name at constant pool index %u in class file %s", 772 name_ref_index, THREAD); 773 return; 774 } 775 } 776 break; 777 } 778 // Other ref_kinds are already fully checked in previous pass. 779 } // switch(ref_kind) 780 break; 781 } 782 case JVM_CONSTANT_MethodType: { 783 const Symbol* const no_name = vmSymbols::type_name(); // place holder 784 const Symbol* const signature = cp->method_type_signature_at(index); 785 verify_legal_method_signature(no_name, signature, CHECK); 786 break; 787 } 788 case JVM_CONSTANT_Utf8: { 789 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 790 } 791 } // switch(tag) 792 } // end of for 793 } 794 795 class NameSigHash: public ResourceObj { 796 public: 797 const Symbol* _name; // name 798 const Symbol* _sig; // signature 799 NameSigHash* _next; // Next entry in hash table 800 }; 801 802 static const int HASH_ROW_SIZE = 256; 803 804 static unsigned int hash(const Symbol* name, const Symbol* sig) { 805 unsigned int raw_hash = 0; 806 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 807 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 808 809 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 810 } 811 812 813 static void initialize_hashtable(NameSigHash** table) { 814 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 815 } 816 // Return false if the name/sig combination is found in table. 817 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 818 // The old format checker uses heap sort to find duplicates. 819 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 820 // of table since we don't expect Symbol*'s to move. 821 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 822 assert(name != NULL, "name in constant pool is NULL"); 823 824 // First lookup for duplicates 825 int index = hash(name, sig); 826 NameSigHash* entry = table[index]; 827 while (entry != NULL) { 828 if (entry->_name == name && entry->_sig == sig) { 829 return false; 830 } 831 entry = entry->_next; 832 } 833 834 // No duplicate is found, allocate a new entry and fill it. 835 entry = new NameSigHash(); 836 entry->_name = name; 837 entry->_sig = sig; 838 839 // Insert into hash table 840 entry->_next = table[index]; 841 table[index] = entry; 842 843 return true; 844 } 845 846 // Side-effects: populates the _local_interfaces field 847 void ClassFileParser::parse_interfaces(const ClassFileStream* stream, 848 int itfs_len, 849 ConstantPool* cp, 850 bool* const has_nonstatic_concrete_methods, 851 // FIXME: lots of these functions 852 // declare their parameters as const, 853 // which adds only noise to the code. 854 // Remove the spurious const modifiers. 855 // Many are of the form "const int x" 856 // or "T* const x". 857 bool* const is_declared_atomic, 858 TRAPS) { 859 assert(stream != NULL, "invariant"); 860 assert(cp != NULL, "invariant"); 861 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 862 863 if (itfs_len == 0) { 864 _temp_local_interfaces = new GrowableArray<InstanceKlass*>(0); 865 } else { 866 assert(itfs_len > 0, "only called for len>0"); 867 _temp_local_interfaces = new GrowableArray<InstanceKlass*>(itfs_len); 868 int index = 0; 869 for (index = 0; index < itfs_len; index++) { 870 const u2 interface_index = stream->get_u2(CHECK); 871 Klass* interf; 872 check_property( 873 valid_klass_reference_at(interface_index), 874 "Interface name has bad constant pool index %u in class file %s", 875 interface_index, CHECK); 876 if (cp->tag_at(interface_index).is_klass()) { 877 interf = cp->resolved_klass_at(interface_index); 878 } else { 879 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 880 881 // Don't need to check legal name because it's checked when parsing constant pool. 882 // But need to make sure it's not an array type. 883 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 884 "Bad interface name in class file %s", CHECK); 885 886 // Call resolve_super so class circularity is checked 887 interf = SystemDictionary::resolve_super_or_fail( 888 _class_name, 889 unresolved_klass, 890 Handle(THREAD, _loader_data->class_loader()), 891 _protection_domain, 892 false, 893 CHECK); 894 } 895 896 if (!interf->is_interface()) { 897 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 898 err_msg("class %s can not implement %s, because it is not an interface (%s)", 899 _class_name->as_klass_external_name(), 900 interf->external_name(), 901 interf->class_in_module_of_loader())); 902 } 903 904 InstanceKlass* ik = InstanceKlass::cast(interf); 905 if (is_inline_type() && ik->invalid_inline_super()) { 906 ResourceMark rm(THREAD); 907 Exceptions::fthrow( 908 THREAD_AND_LOCATION, 909 vmSymbols::java_lang_IncompatibleClassChangeError(), 910 "Inline type %s has an identity type as supertype", 911 _class_name->as_klass_external_name()); 912 return; 913 } 914 if (ik->invalid_inline_super()) { 915 set_invalid_inline_super(); 916 } 917 if (ik->has_nonstatic_concrete_methods()) { 918 *has_nonstatic_concrete_methods = true; 919 } 920 if (ik->is_declared_atomic()) { 921 *is_declared_atomic = true; 922 } 923 _temp_local_interfaces->append(ik); 924 } 925 926 if (!_need_verify || itfs_len <= 1) { 927 return; 928 } 929 930 // Check if there's any duplicates in interfaces 931 ResourceMark rm(THREAD); 932 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 933 NameSigHash*, 934 HASH_ROW_SIZE); 935 initialize_hashtable(interface_names); 936 bool dup = false; 937 const Symbol* name = NULL; 938 { 939 debug_only(NoSafepointVerifier nsv;) 940 for (index = 0; index < itfs_len; index++) { 941 const InstanceKlass* const k = _temp_local_interfaces->at(index); 942 name = k->name(); 943 // If no duplicates, add (name, NULL) in hashtable interface_names. 944 if (!put_after_lookup(name, NULL, interface_names)) { 945 dup = true; 946 break; 947 } 948 } 949 } 950 if (dup) { 951 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 952 name->as_C_string(), THREAD); 953 } 954 } 955 } 956 957 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 958 int constantvalue_index, 959 int signature_index, 960 TRAPS) const { 961 // Make sure the constant pool entry is of a type appropriate to this field 962 guarantee_property( 963 (constantvalue_index > 0 && 964 constantvalue_index < cp->length()), 965 "Bad initial value index %u in ConstantValue attribute in class file %s", 966 constantvalue_index, CHECK); 967 968 const constantTag value_type = cp->tag_at(constantvalue_index); 969 switch(cp->basic_type_for_signature_at(signature_index)) { 970 case T_LONG: { 971 guarantee_property(value_type.is_long(), 972 "Inconsistent constant value type in class file %s", 973 CHECK); 974 break; 975 } 976 case T_FLOAT: { 977 guarantee_property(value_type.is_float(), 978 "Inconsistent constant value type in class file %s", 979 CHECK); 980 break; 981 } 982 case T_DOUBLE: { 983 guarantee_property(value_type.is_double(), 984 "Inconsistent constant value type in class file %s", 985 CHECK); 986 break; 987 } 988 case T_BYTE: 989 case T_CHAR: 990 case T_SHORT: 991 case T_BOOLEAN: 992 case T_INT: { 993 guarantee_property(value_type.is_int(), 994 "Inconsistent constant value type in class file %s", 995 CHECK); 996 break; 997 } 998 case T_OBJECT: { 999 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1000 && value_type.is_string()), 1001 "Bad string initial value in class file %s", 1002 CHECK); 1003 break; 1004 } 1005 default: { 1006 classfile_parse_error("Unable to set initial value %u in class file %s", 1007 constantvalue_index, 1008 THREAD); 1009 } 1010 } 1011 } 1012 1013 class AnnotationCollector : public ResourceObj{ 1014 public: 1015 enum Location { _in_field, _in_method, _in_class }; 1016 enum ID { 1017 _unknown = 0, 1018 _method_CallerSensitive, 1019 _method_ForceInline, 1020 _method_DontInline, 1021 _method_InjectedProfile, 1022 _method_LambdaForm_Compiled, 1023 _method_Hidden, 1024 _method_Scoped, 1025 _method_IntrinsicCandidate, 1026 _jdk_internal_vm_annotation_Contended, 1027 _field_Stable, 1028 _jdk_internal_vm_annotation_ReservedStackAccess, 1029 _jdk_internal_ValueBased, 1030 _annotation_LIMIT 1031 }; 1032 const Location _location; 1033 int _annotations_present; 1034 u2 _contended_group; 1035 1036 AnnotationCollector(Location location) 1037 : _location(location), _annotations_present(0), _contended_group(0) 1038 { 1039 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1040 } 1041 // If this annotation name has an ID, report it (or _none). 1042 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations); 1043 // Set the annotation name: 1044 void set_annotation(ID id) { 1045 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1046 _annotations_present |= nth_bit((int)id); 1047 } 1048 1049 void remove_annotation(ID id) { 1050 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1051 _annotations_present &= ~nth_bit((int)id); 1052 } 1053 1054 // Report if the annotation is present. 1055 bool has_any_annotations() const { return _annotations_present != 0; } 1056 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1057 1058 void set_contended_group(u2 group) { _contended_group = group; } 1059 u2 contended_group() const { return _contended_group; } 1060 1061 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1062 1063 void set_stable(bool stable) { set_annotation(_field_Stable); } 1064 bool is_stable() const { return has_annotation(_field_Stable); } 1065 }; 1066 1067 // This class also doubles as a holder for metadata cleanup. 1068 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1069 private: 1070 ClassLoaderData* _loader_data; 1071 AnnotationArray* _field_annotations; 1072 AnnotationArray* _field_type_annotations; 1073 public: 1074 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1075 AnnotationCollector(_in_field), 1076 _loader_data(loader_data), 1077 _field_annotations(NULL), 1078 _field_type_annotations(NULL) {} 1079 ~FieldAnnotationCollector(); 1080 void apply_to(FieldInfo* f); 1081 AnnotationArray* field_annotations() { return _field_annotations; } 1082 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1083 1084 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1085 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1086 }; 1087 1088 class MethodAnnotationCollector : public AnnotationCollector{ 1089 public: 1090 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1091 void apply_to(const methodHandle& m); 1092 }; 1093 1094 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1095 public: 1096 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1097 void apply_to(InstanceKlass* ik); 1098 }; 1099 1100 1101 static int skip_annotation_value(const u1*, int, int); // fwd decl 1102 1103 // Safely increment index by val if does not pass limit 1104 #define SAFE_ADD(index, limit, val) \ 1105 if (index >= limit - val) return limit; \ 1106 index += val; 1107 1108 // Skip an annotation. Return >=limit if there is any problem. 1109 static int skip_annotation(const u1* buffer, int limit, int index) { 1110 assert(buffer != NULL, "invariant"); 1111 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1112 // value := switch (tag:u1) { ... } 1113 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1114 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1115 while (--nmem >= 0 && index < limit) { 1116 SAFE_ADD(index, limit, 2); // skip member 1117 index = skip_annotation_value(buffer, limit, index); 1118 } 1119 return index; 1120 } 1121 1122 // Skip an annotation value. Return >=limit if there is any problem. 1123 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1124 assert(buffer != NULL, "invariant"); 1125 1126 // value := switch (tag:u1) { 1127 // case B, C, I, S, Z, D, F, J, c: con:u2; 1128 // case e: e_class:u2 e_name:u2; 1129 // case s: s_con:u2; 1130 // case [: do(nval:u2) {value}; 1131 // case @: annotation; 1132 // case s: s_con:u2; 1133 // } 1134 SAFE_ADD(index, limit, 1); // read tag 1135 const u1 tag = buffer[index - 1]; 1136 switch (tag) { 1137 case 'B': 1138 case 'C': 1139 case 'I': 1140 case 'S': 1141 case 'Z': 1142 case 'D': 1143 case 'F': 1144 case 'J': 1145 case 'c': 1146 case 's': 1147 SAFE_ADD(index, limit, 2); // skip con or s_con 1148 break; 1149 case 'e': 1150 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1151 break; 1152 case '[': 1153 { 1154 SAFE_ADD(index, limit, 2); // read nval 1155 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1156 while (--nval >= 0 && index < limit) { 1157 index = skip_annotation_value(buffer, limit, index); 1158 } 1159 } 1160 break; 1161 case '@': 1162 index = skip_annotation(buffer, limit, index); 1163 break; 1164 default: 1165 return limit; // bad tag byte 1166 } 1167 return index; 1168 } 1169 1170 // Sift through annotations, looking for those significant to the VM: 1171 static void parse_annotations(const ConstantPool* const cp, 1172 const u1* buffer, int limit, 1173 AnnotationCollector* coll, 1174 ClassLoaderData* loader_data, 1175 const bool can_access_vm_annotations) { 1176 1177 assert(cp != NULL, "invariant"); 1178 assert(buffer != NULL, "invariant"); 1179 assert(coll != NULL, "invariant"); 1180 assert(loader_data != NULL, "invariant"); 1181 1182 // annotations := do(nann:u2) {annotation} 1183 int index = 2; // read nann 1184 if (index >= limit) return; 1185 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1186 enum { // initial annotation layout 1187 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1188 count_off = 2, // u2 such as 1 (one value) 1189 member_off = 4, // utf8 such as 'value' 1190 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1191 e_tag_val = 'e', 1192 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1193 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1194 e_size = 11, // end of 'e' annotation 1195 c_tag_val = 'c', // payload is type 1196 c_con_off = 7, // utf8 payload, such as 'I' 1197 c_size = 9, // end of 'c' annotation 1198 s_tag_val = 's', // payload is String 1199 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1200 s_size = 9, 1201 min_size = 6 // smallest possible size (zero members) 1202 }; 1203 // Cannot add min_size to index in case of overflow MAX_INT 1204 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1205 int index0 = index; 1206 index = skip_annotation(buffer, limit, index); 1207 const u1* const abase = buffer + index0; 1208 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1209 const int count = Bytes::get_Java_u2((address)abase + count_off); 1210 const Symbol* const aname = check_symbol_at(cp, atype); 1211 if (aname == NULL) break; // invalid annotation name 1212 const Symbol* member = NULL; 1213 if (count >= 1) { 1214 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1215 member = check_symbol_at(cp, member_index); 1216 if (member == NULL) break; // invalid member name 1217 } 1218 1219 // Here is where parsing particular annotations will take place. 1220 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations); 1221 if (AnnotationCollector::_unknown == id) continue; 1222 coll->set_annotation(id); 1223 1224 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1225 // @Contended can optionally specify the contention group. 1226 // 1227 // Contended group defines the equivalence class over the fields: 1228 // the fields within the same contended group are not treated distinct. 1229 // The only exception is default group, which does not incur the 1230 // equivalence. Naturally, contention group for classes is meaningless. 1231 // 1232 // While the contention group is specified as String, annotation 1233 // values are already interned, and we might as well use the constant 1234 // pool index as the group tag. 1235 // 1236 u2 group_index = 0; // default contended group 1237 if (count == 1 1238 && s_size == (index - index0) // match size 1239 && s_tag_val == *(abase + tag_off) 1240 && member == vmSymbols::value_name()) { 1241 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1242 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1243 group_index = 0; // default contended group 1244 } 1245 } 1246 coll->set_contended_group(group_index); 1247 } 1248 } 1249 } 1250 1251 1252 // Parse attributes for a field. 1253 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1254 u2 attributes_count, 1255 bool is_static, u2 signature_index, 1256 u2* const constantvalue_index_addr, 1257 bool* const is_synthetic_addr, 1258 u2* const generic_signature_index_addr, 1259 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1260 TRAPS) { 1261 assert(cfs != NULL, "invariant"); 1262 assert(constantvalue_index_addr != NULL, "invariant"); 1263 assert(is_synthetic_addr != NULL, "invariant"); 1264 assert(generic_signature_index_addr != NULL, "invariant"); 1265 assert(parsed_annotations != NULL, "invariant"); 1266 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1267 1268 u2 constantvalue_index = 0; 1269 u2 generic_signature_index = 0; 1270 bool is_synthetic = false; 1271 const u1* runtime_visible_annotations = NULL; 1272 int runtime_visible_annotations_length = 0; 1273 const u1* runtime_invisible_annotations = NULL; 1274 int runtime_invisible_annotations_length = 0; 1275 const u1* runtime_visible_type_annotations = NULL; 1276 int runtime_visible_type_annotations_length = 0; 1277 const u1* runtime_invisible_type_annotations = NULL; 1278 int runtime_invisible_type_annotations_length = 0; 1279 bool runtime_invisible_annotations_exists = false; 1280 bool runtime_invisible_type_annotations_exists = false; 1281 const ConstantPool* const cp = _cp; 1282 1283 while (attributes_count--) { 1284 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1285 const u2 attribute_name_index = cfs->get_u2_fast(); 1286 const u4 attribute_length = cfs->get_u4_fast(); 1287 check_property(valid_symbol_at(attribute_name_index), 1288 "Invalid field attribute index %u in class file %s", 1289 attribute_name_index, 1290 CHECK); 1291 1292 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1293 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1294 // ignore if non-static 1295 if (constantvalue_index != 0) { 1296 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD); 1297 return; 1298 } 1299 check_property( 1300 attribute_length == 2, 1301 "Invalid ConstantValue field attribute length %u in class file %s", 1302 attribute_length, CHECK); 1303 1304 constantvalue_index = cfs->get_u2(CHECK); 1305 if (_need_verify) { 1306 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1307 } 1308 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1309 if (attribute_length != 0) { 1310 classfile_parse_error( 1311 "Invalid Synthetic field attribute length %u in class file %s", 1312 attribute_length, THREAD); 1313 return; 1314 } 1315 is_synthetic = true; 1316 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1317 if (attribute_length != 0) { 1318 classfile_parse_error( 1319 "Invalid Deprecated field attribute length %u in class file %s", 1320 attribute_length, THREAD); 1321 return; 1322 } 1323 } else if (_major_version >= JAVA_1_5_VERSION) { 1324 if (attribute_name == vmSymbols::tag_signature()) { 1325 if (generic_signature_index != 0) { 1326 classfile_parse_error( 1327 "Multiple Signature attributes for field in class file %s", THREAD); 1328 return; 1329 } 1330 if (attribute_length != 2) { 1331 classfile_parse_error( 1332 "Wrong size %u for field's Signature attribute in class file %s", 1333 attribute_length, THREAD); 1334 return; 1335 } 1336 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1337 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1338 if (runtime_visible_annotations != NULL) { 1339 classfile_parse_error( 1340 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD); 1341 return; 1342 } 1343 runtime_visible_annotations_length = attribute_length; 1344 runtime_visible_annotations = cfs->current(); 1345 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1346 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1347 parse_annotations(cp, 1348 runtime_visible_annotations, 1349 runtime_visible_annotations_length, 1350 parsed_annotations, 1351 _loader_data, 1352 _can_access_vm_annotations); 1353 cfs->skip_u1_fast(runtime_visible_annotations_length); 1354 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1355 if (runtime_invisible_annotations_exists) { 1356 classfile_parse_error( 1357 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD); 1358 return; 1359 } 1360 runtime_invisible_annotations_exists = true; 1361 if (PreserveAllAnnotations) { 1362 runtime_invisible_annotations_length = attribute_length; 1363 runtime_invisible_annotations = cfs->current(); 1364 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1365 } 1366 cfs->skip_u1(attribute_length, CHECK); 1367 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1368 if (runtime_visible_type_annotations != NULL) { 1369 classfile_parse_error( 1370 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD); 1371 return; 1372 } 1373 runtime_visible_type_annotations_length = attribute_length; 1374 runtime_visible_type_annotations = cfs->current(); 1375 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1376 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1377 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1378 if (runtime_invisible_type_annotations_exists) { 1379 classfile_parse_error( 1380 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD); 1381 return; 1382 } else { 1383 runtime_invisible_type_annotations_exists = true; 1384 } 1385 if (PreserveAllAnnotations) { 1386 runtime_invisible_type_annotations_length = attribute_length; 1387 runtime_invisible_type_annotations = cfs->current(); 1388 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1389 } 1390 cfs->skip_u1(attribute_length, CHECK); 1391 } else { 1392 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1393 } 1394 } else { 1395 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1396 } 1397 } 1398 1399 *constantvalue_index_addr = constantvalue_index; 1400 *is_synthetic_addr = is_synthetic; 1401 *generic_signature_index_addr = generic_signature_index; 1402 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1403 runtime_visible_annotations_length, 1404 runtime_invisible_annotations, 1405 runtime_invisible_annotations_length, 1406 CHECK); 1407 parsed_annotations->set_field_annotations(a); 1408 a = assemble_annotations(runtime_visible_type_annotations, 1409 runtime_visible_type_annotations_length, 1410 runtime_invisible_type_annotations, 1411 runtime_invisible_type_annotations_length, 1412 CHECK); 1413 parsed_annotations->set_field_type_annotations(a); 1414 return; 1415 } 1416 1417 1418 // Field allocation types. Used for computing field offsets. 1419 1420 enum FieldAllocationType { 1421 STATIC_OOP, // Oops 1422 STATIC_BYTE, // Boolean, Byte, char 1423 STATIC_SHORT, // shorts 1424 STATIC_WORD, // ints 1425 STATIC_DOUBLE, // aligned long or double 1426 STATIC_INLINE, // inline type field 1427 NONSTATIC_OOP, 1428 NONSTATIC_BYTE, 1429 NONSTATIC_SHORT, 1430 NONSTATIC_WORD, 1431 NONSTATIC_DOUBLE, 1432 NONSTATIC_INLINE, 1433 MAX_FIELD_ALLOCATION_TYPE, 1434 BAD_ALLOCATION_TYPE = -1 1435 }; 1436 1437 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1438 BAD_ALLOCATION_TYPE, // 0 1439 BAD_ALLOCATION_TYPE, // 1 1440 BAD_ALLOCATION_TYPE, // 2 1441 BAD_ALLOCATION_TYPE, // 3 1442 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1443 NONSTATIC_SHORT, // T_CHAR = 5, 1444 NONSTATIC_WORD, // T_FLOAT = 6, 1445 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1446 NONSTATIC_BYTE, // T_BYTE = 8, 1447 NONSTATIC_SHORT, // T_SHORT = 9, 1448 NONSTATIC_WORD, // T_INT = 10, 1449 NONSTATIC_DOUBLE, // T_LONG = 11, 1450 NONSTATIC_OOP, // T_OBJECT = 12, 1451 NONSTATIC_OOP, // T_ARRAY = 13, 1452 NONSTATIC_OOP, // T_PRIMITIVE_OBJECT = 14, 1453 BAD_ALLOCATION_TYPE, // T_VOID = 15, 1454 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16, 1455 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17, 1456 BAD_ALLOCATION_TYPE, // T_METADATA = 18, 1457 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19, 1458 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20, 1459 BAD_ALLOCATION_TYPE, // 0 1460 BAD_ALLOCATION_TYPE, // 1 1461 BAD_ALLOCATION_TYPE, // 2 1462 BAD_ALLOCATION_TYPE, // 3 1463 STATIC_BYTE , // T_BOOLEAN = 4, 1464 STATIC_SHORT, // T_CHAR = 5, 1465 STATIC_WORD, // T_FLOAT = 6, 1466 STATIC_DOUBLE, // T_DOUBLE = 7, 1467 STATIC_BYTE, // T_BYTE = 8, 1468 STATIC_SHORT, // T_SHORT = 9, 1469 STATIC_WORD, // T_INT = 10, 1470 STATIC_DOUBLE, // T_LONG = 11, 1471 STATIC_OOP, // T_OBJECT = 12, 1472 STATIC_OOP, // T_ARRAY = 13, 1473 STATIC_OOP, // T_PRIMITIVE_OBJECT = 14, 1474 BAD_ALLOCATION_TYPE, // T_VOID = 15, 1475 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16, 1476 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17, 1477 BAD_ALLOCATION_TYPE, // T_METADATA = 18, 1478 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19, 1479 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20 1480 }; 1481 1482 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_inline_type) { 1483 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1484 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1485 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1486 if (is_inline_type) { 1487 result = is_static ? STATIC_INLINE : NONSTATIC_INLINE; 1488 } 1489 return result; 1490 } 1491 1492 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1493 public: 1494 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1495 1496 FieldAllocationCount() { 1497 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1498 count[i] = 0; 1499 } 1500 } 1501 1502 void update(bool is_static, BasicType type, bool is_inline_type) { 1503 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_inline_type); 1504 if (atype != BAD_ALLOCATION_TYPE) { 1505 // Make sure there is no overflow with injected fields. 1506 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1507 count[atype]++; 1508 } 1509 } 1510 }; 1511 1512 // Side-effects: populates the _fields, _fields_annotations, 1513 // _fields_type_annotations fields 1514 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1515 bool is_interface, 1516 bool is_inline_type, 1517 bool is_permits_value_class, 1518 FieldAllocationCount* const fac, 1519 ConstantPool* cp, 1520 const int cp_size, 1521 u2* const java_fields_count_ptr, 1522 TRAPS) { 1523 1524 assert(cfs != NULL, "invariant"); 1525 assert(fac != NULL, "invariant"); 1526 assert(cp != NULL, "invariant"); 1527 assert(java_fields_count_ptr != NULL, "invariant"); 1528 1529 assert(NULL == _fields, "invariant"); 1530 assert(NULL == _fields_annotations, "invariant"); 1531 assert(NULL == _fields_type_annotations, "invariant"); 1532 1533 cfs->guarantee_more(2, CHECK); // length 1534 const u2 length = cfs->get_u2_fast(); 1535 *java_fields_count_ptr = length; 1536 1537 int num_injected = 0; 1538 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1539 &num_injected); 1540 1541 // two more slots are required for inline classes: 1542 // one for the static field with a reference to the pre-allocated default value 1543 // one for the field the JVM injects when detecting an empty inline class 1544 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0); 1545 1546 // The field array starts with tuples of shorts 1547 // [access, name index, sig index, initial value index, byte offset]. 1548 // A generic signature slot only exists for field with generic 1549 // signature attribute. And the access flag is set with 1550 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1551 // signature slots are at the end of the field array and after all 1552 // other fields data. 1553 // 1554 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1555 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1556 // ... 1557 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1558 // [generic signature index] 1559 // [generic signature index] 1560 // ... 1561 // 1562 // Allocate a temporary resource array for field data. For each field, 1563 // a slot is reserved in the temporary array for the generic signature 1564 // index. After parsing all fields, the data are copied to a permanent 1565 // array and any unused slots will be discarded. 1566 ResourceMark rm(THREAD); 1567 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1568 u2, 1569 total_fields * (FieldInfo::field_slots + 1)); 1570 1571 // The generic signature slots start after all other fields' data. 1572 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1573 int num_generic_signature = 0; 1574 int instance_fields_count = 0; 1575 for (int n = 0; n < length; n++) { 1576 // access_flags, name_index, descriptor_index, attributes_count 1577 cfs->guarantee_more(8, CHECK); 1578 1579 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS; 1580 1581 const jint flags = cfs->get_u2_fast() & recognized_modifiers; 1582 verify_legal_field_modifiers(flags, is_interface, is_inline_type, is_permits_value_class, CHECK); 1583 AccessFlags access_flags; 1584 access_flags.set_flags(flags); 1585 1586 const u2 name_index = cfs->get_u2_fast(); 1587 check_property(valid_symbol_at(name_index), 1588 "Invalid constant pool index %u for field name in class file %s", 1589 name_index, CHECK); 1590 const Symbol* const name = cp->symbol_at(name_index); 1591 verify_legal_field_name(name, CHECK); 1592 1593 const u2 signature_index = cfs->get_u2_fast(); 1594 check_property(valid_symbol_at(signature_index), 1595 "Invalid constant pool index %u for field signature in class file %s", 1596 signature_index, CHECK); 1597 const Symbol* const sig = cp->symbol_at(signature_index); 1598 verify_legal_field_signature(name, sig, CHECK); 1599 if (!access_flags.is_static()) instance_fields_count++; 1600 1601 u2 constantvalue_index = 0; 1602 bool is_synthetic = false; 1603 u2 generic_signature_index = 0; 1604 const bool is_static = access_flags.is_static(); 1605 FieldAnnotationCollector parsed_annotations(_loader_data); 1606 1607 const u2 attributes_count = cfs->get_u2_fast(); 1608 if (attributes_count > 0) { 1609 parse_field_attributes(cfs, 1610 attributes_count, 1611 is_static, 1612 signature_index, 1613 &constantvalue_index, 1614 &is_synthetic, 1615 &generic_signature_index, 1616 &parsed_annotations, 1617 CHECK); 1618 1619 if (parsed_annotations.field_annotations() != NULL) { 1620 if (_fields_annotations == NULL) { 1621 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1622 _loader_data, length, NULL, 1623 CHECK); 1624 } 1625 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1626 parsed_annotations.set_field_annotations(NULL); 1627 } 1628 if (parsed_annotations.field_type_annotations() != NULL) { 1629 if (_fields_type_annotations == NULL) { 1630 _fields_type_annotations = 1631 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1632 length, 1633 NULL, 1634 CHECK); 1635 } 1636 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1637 parsed_annotations.set_field_type_annotations(NULL); 1638 } 1639 1640 if (is_synthetic) { 1641 access_flags.set_is_synthetic(); 1642 } 1643 if (generic_signature_index != 0) { 1644 access_flags.set_field_has_generic_signature(); 1645 fa[generic_signature_slot] = generic_signature_index; 1646 generic_signature_slot ++; 1647 num_generic_signature ++; 1648 } 1649 } 1650 1651 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1652 field->initialize(access_flags.as_short(), 1653 name_index, 1654 signature_index, 1655 constantvalue_index); 1656 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1657 1658 // Update FieldAllocationCount for this kind of field 1659 fac->update(is_static, type, type == T_PRIMITIVE_OBJECT); 1660 1661 // After field is initialized with type, we can augment it with aux info 1662 if (parsed_annotations.has_any_annotations()) { 1663 parsed_annotations.apply_to(field); 1664 if (field->is_contended()) { 1665 _has_contended_fields = true; 1666 } 1667 } 1668 } 1669 1670 int index = length; 1671 if (num_injected != 0) { 1672 for (int n = 0; n < num_injected; n++) { 1673 // Check for duplicates 1674 if (injected[n].may_be_java) { 1675 const Symbol* const name = injected[n].name(); 1676 const Symbol* const signature = injected[n].signature(); 1677 bool duplicate = false; 1678 for (int i = 0; i < length; i++) { 1679 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1680 if (name == cp->symbol_at(f->name_index()) && 1681 signature == cp->symbol_at(f->signature_index())) { 1682 // Symbol is desclared in Java so skip this one 1683 duplicate = true; 1684 break; 1685 } 1686 } 1687 if (duplicate) { 1688 // These will be removed from the field array at the end 1689 continue; 1690 } 1691 } 1692 1693 // Injected field 1694 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1695 field->initialize((u2)JVM_ACC_FIELD_INTERNAL, 1696 (u2)(injected[n].name_index), 1697 (u2)(injected[n].signature_index), 1698 0); 1699 1700 const BasicType type = Signature::basic_type(injected[n].signature()); 1701 1702 // Update FieldAllocationCount for this kind of field 1703 fac->update(false, type, false); 1704 index++; 1705 } 1706 } 1707 1708 if (is_inline_type) { 1709 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1710 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC, 1711 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)), 1712 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)), 1713 0); 1714 const BasicType type = Signature::basic_type(vmSymbols::object_signature()); 1715 fac->update(true, type, false); 1716 index++; 1717 } 1718 1719 if (is_inline_type && instance_fields_count == 0) { 1720 _is_empty_inline_type = true; 1721 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1722 field->initialize(JVM_ACC_FIELD_INTERNAL, 1723 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(empty_marker_name)), 1724 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(byte_signature)), 1725 0); 1726 const BasicType type = Signature::basic_type(vmSymbols::byte_signature()); 1727 fac->update(false, type, false); 1728 index++; 1729 } 1730 1731 if (instance_fields_count > 0) { 1732 _has_nonstatic_fields = true; 1733 } 1734 1735 assert(NULL == _fields, "invariant"); 1736 1737 _fields = 1738 MetadataFactory::new_array<u2>(_loader_data, 1739 index * FieldInfo::field_slots + num_generic_signature, 1740 CHECK); 1741 // Sometimes injected fields already exist in the Java source so 1742 // the fields array could be too long. In that case the 1743 // fields array is trimed. Also unused slots that were reserved 1744 // for generic signature indexes are discarded. 1745 { 1746 int i = 0; 1747 for (; i < index * FieldInfo::field_slots; i++) { 1748 _fields->at_put(i, fa[i]); 1749 } 1750 for (int j = total_fields * FieldInfo::field_slots; 1751 j < generic_signature_slot; j++) { 1752 _fields->at_put(i++, fa[j]); 1753 } 1754 assert(_fields->length() == i, ""); 1755 } 1756 1757 if (_need_verify && length > 1) { 1758 // Check duplicated fields 1759 ResourceMark rm(THREAD); 1760 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1761 THREAD, NameSigHash*, HASH_ROW_SIZE); 1762 initialize_hashtable(names_and_sigs); 1763 bool dup = false; 1764 const Symbol* name = NULL; 1765 const Symbol* sig = NULL; 1766 { 1767 debug_only(NoSafepointVerifier nsv;) 1768 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1769 name = fs.name(); 1770 sig = fs.signature(); 1771 // If no duplicates, add name/signature in hashtable names_and_sigs. 1772 if (!put_after_lookup(name, sig, names_and_sigs)) { 1773 dup = true; 1774 break; 1775 } 1776 } 1777 } 1778 if (dup) { 1779 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1780 name->as_C_string(), sig->as_klass_external_name(), THREAD); 1781 } 1782 } 1783 } 1784 1785 1786 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1787 u4 code_length, 1788 u4 exception_table_length, 1789 TRAPS) { 1790 assert(cfs != NULL, "invariant"); 1791 1792 const unsafe_u2* const exception_table_start = cfs->current(); 1793 assert(exception_table_start != NULL, "null exception table"); 1794 1795 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1796 // end_pc, 1797 // handler_pc, 1798 // catch_type_index 1799 1800 // Will check legal target after parsing code array in verifier. 1801 if (_need_verify) { 1802 for (unsigned int i = 0; i < exception_table_length; i++) { 1803 const u2 start_pc = cfs->get_u2_fast(); 1804 const u2 end_pc = cfs->get_u2_fast(); 1805 const u2 handler_pc = cfs->get_u2_fast(); 1806 const u2 catch_type_index = cfs->get_u2_fast(); 1807 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1808 "Illegal exception table range in class file %s", 1809 CHECK_NULL); 1810 guarantee_property(handler_pc < code_length, 1811 "Illegal exception table handler in class file %s", 1812 CHECK_NULL); 1813 if (catch_type_index != 0) { 1814 guarantee_property(valid_klass_reference_at(catch_type_index), 1815 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1816 } 1817 } 1818 } else { 1819 cfs->skip_u2_fast(exception_table_length * 4); 1820 } 1821 return exception_table_start; 1822 } 1823 1824 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1825 u4 code_length, 1826 CompressedLineNumberWriteStream**const write_stream, 1827 TRAPS) { 1828 1829 const ClassFileStream* const cfs = _stream; 1830 unsigned int num_entries = cfs->get_u2(CHECK); 1831 1832 // Each entry is a u2 start_pc, and a u2 line_number 1833 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1834 1835 // Verify line number attribute and table length 1836 check_property( 1837 code_attribute_length == sizeof(u2) + length_in_bytes, 1838 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1839 1840 cfs->guarantee_more(length_in_bytes, CHECK); 1841 1842 if ((*write_stream) == NULL) { 1843 if (length_in_bytes > fixed_buffer_size) { 1844 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1845 } else { 1846 (*write_stream) = new CompressedLineNumberWriteStream( 1847 _linenumbertable_buffer, fixed_buffer_size); 1848 } 1849 } 1850 1851 while (num_entries-- > 0) { 1852 const u2 bci = cfs->get_u2_fast(); // start_pc 1853 const u2 line = cfs->get_u2_fast(); // line_number 1854 guarantee_property(bci < code_length, 1855 "Invalid pc in LineNumberTable in class file %s", CHECK); 1856 (*write_stream)->write_pair(bci, line); 1857 } 1858 } 1859 1860 1861 class LVT_Hash : public AllStatic { 1862 public: 1863 1864 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1865 /* 1866 * 3-tuple start_bci/length/slot has to be unique key, 1867 * so the following comparison seems to be redundant: 1868 * && elem->name_cp_index == entry->_elem->name_cp_index 1869 */ 1870 return (e0.start_bci == e1.start_bci && 1871 e0.length == e1.length && 1872 e0.name_cp_index == e1.name_cp_index && 1873 e0.slot == e1.slot); 1874 } 1875 1876 static unsigned int hash(LocalVariableTableElement const& e0) { 1877 unsigned int raw_hash = e0.start_bci; 1878 1879 raw_hash = e0.length + raw_hash * 37; 1880 raw_hash = e0.name_cp_index + raw_hash * 37; 1881 raw_hash = e0.slot + raw_hash * 37; 1882 1883 return raw_hash; 1884 } 1885 }; 1886 1887 1888 // Class file LocalVariableTable elements. 1889 class Classfile_LVT_Element { 1890 public: 1891 u2 start_bci; 1892 u2 length; 1893 u2 name_cp_index; 1894 u2 descriptor_cp_index; 1895 u2 slot; 1896 }; 1897 1898 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1899 LocalVariableTableElement* const lvt) { 1900 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1901 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1902 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1903 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1904 lvt->signature_cp_index = 0; 1905 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1906 } 1907 1908 // Function is used to parse both attributes: 1909 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1910 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1911 u4 code_length, 1912 u2 max_locals, 1913 u4 code_attribute_length, 1914 u2* const localvariable_table_length, 1915 bool isLVTT, 1916 TRAPS) { 1917 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1918 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1919 const unsigned int size = 1920 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1921 1922 const ConstantPool* const cp = _cp; 1923 1924 // Verify local variable table attribute has right length 1925 if (_need_verify) { 1926 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1927 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1928 } 1929 1930 const unsafe_u2* const localvariable_table_start = cfs->current(); 1931 assert(localvariable_table_start != NULL, "null local variable table"); 1932 if (!_need_verify) { 1933 cfs->skip_u2_fast(size); 1934 } else { 1935 cfs->guarantee_more(size * 2, CHECK_NULL); 1936 for(int i = 0; i < (*localvariable_table_length); i++) { 1937 const u2 start_pc = cfs->get_u2_fast(); 1938 const u2 length = cfs->get_u2_fast(); 1939 const u2 name_index = cfs->get_u2_fast(); 1940 const u2 descriptor_index = cfs->get_u2_fast(); 1941 const u2 index = cfs->get_u2_fast(); 1942 // Assign to a u4 to avoid overflow 1943 const u4 end_pc = (u4)start_pc + (u4)length; 1944 1945 if (start_pc >= code_length) { 1946 classfile_parse_error( 1947 "Invalid start_pc %u in %s in class file %s", 1948 start_pc, tbl_name, THREAD); 1949 return NULL; 1950 } 1951 if (end_pc > code_length) { 1952 classfile_parse_error( 1953 "Invalid length %u in %s in class file %s", 1954 length, tbl_name, THREAD); 1955 return NULL; 1956 } 1957 const int cp_size = cp->length(); 1958 guarantee_property(valid_symbol_at(name_index), 1959 "Name index %u in %s has bad constant type in class file %s", 1960 name_index, tbl_name, CHECK_NULL); 1961 guarantee_property(valid_symbol_at(descriptor_index), 1962 "Signature index %u in %s has bad constant type in class file %s", 1963 descriptor_index, tbl_name, CHECK_NULL); 1964 1965 const Symbol* const name = cp->symbol_at(name_index); 1966 const Symbol* const sig = cp->symbol_at(descriptor_index); 1967 verify_legal_field_name(name, CHECK_NULL); 1968 u2 extra_slot = 0; 1969 if (!isLVTT) { 1970 verify_legal_field_signature(name, sig, CHECK_NULL); 1971 1972 // 4894874: check special cases for double and long local variables 1973 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1974 sig == vmSymbols::type_signature(T_LONG)) { 1975 extra_slot = 1; 1976 } 1977 } 1978 guarantee_property((index + extra_slot) < max_locals, 1979 "Invalid index %u in %s in class file %s", 1980 index, tbl_name, CHECK_NULL); 1981 } 1982 } 1983 return localvariable_table_start; 1984 } 1985 1986 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1987 u4 code_attribute_length, 1988 bool need_verify, 1989 TRAPS) { 1990 assert(cfs != NULL, "invariant"); 1991 1992 if (0 == code_attribute_length) { 1993 return NULL; 1994 } 1995 1996 const u1* const stackmap_table_start = cfs->current(); 1997 assert(stackmap_table_start != NULL, "null stackmap table"); 1998 1999 // check code_attribute_length first 2000 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2001 2002 if (!need_verify && !DumpSharedSpaces) { 2003 return NULL; 2004 } 2005 return stackmap_table_start; 2006 } 2007 2008 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2009 u2* const checked_exceptions_length, 2010 u4 method_attribute_length, 2011 TRAPS) { 2012 assert(cfs != NULL, "invariant"); 2013 assert(checked_exceptions_length != NULL, "invariant"); 2014 2015 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2016 *checked_exceptions_length = cfs->get_u2_fast(); 2017 const unsigned int size = 2018 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2019 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2020 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2021 if (!_need_verify) { 2022 cfs->skip_u2_fast(size); 2023 } else { 2024 // Verify each value in the checked exception table 2025 u2 checked_exception; 2026 const u2 len = *checked_exceptions_length; 2027 cfs->guarantee_more(2 * len, CHECK_NULL); 2028 for (int i = 0; i < len; i++) { 2029 checked_exception = cfs->get_u2_fast(); 2030 check_property( 2031 valid_klass_reference_at(checked_exception), 2032 "Exception name has bad type at constant pool %u in class file %s", 2033 checked_exception, CHECK_NULL); 2034 } 2035 } 2036 // check exceptions attribute length 2037 if (_need_verify) { 2038 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2039 sizeof(u2) * size), 2040 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2041 } 2042 return checked_exceptions_start; 2043 } 2044 2045 void ClassFileParser::throwIllegalSignature(const char* type, 2046 const Symbol* name, 2047 const Symbol* sig, 2048 TRAPS) const { 2049 assert(name != NULL, "invariant"); 2050 assert(sig != NULL, "invariant"); 2051 2052 const char* class_note = ""; 2053 if (is_inline_type() && name == vmSymbols::object_initializer_name()) { 2054 class_note = " (an inline class)"; 2055 } 2056 2057 ResourceMark rm(THREAD); 2058 Exceptions::fthrow(THREAD_AND_LOCATION, 2059 vmSymbols::java_lang_ClassFormatError(), 2060 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type, 2061 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string()); 2062 } 2063 2064 AnnotationCollector::ID 2065 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2066 const Symbol* name, 2067 const bool can_access_vm_annotations) { 2068 const vmSymbolID sid = vmSymbols::find_sid(name); 2069 // Privileged code can use all annotations. Other code silently drops some. 2070 const bool privileged = loader_data->is_boot_class_loader_data() || 2071 loader_data->is_platform_class_loader_data() || 2072 can_access_vm_annotations; 2073 switch (sid) { 2074 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2075 if (_location != _in_method) break; // only allow for methods 2076 if (!privileged) break; // only allow in privileged code 2077 return _method_CallerSensitive; 2078 } 2079 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2080 if (_location != _in_method) break; // only allow for methods 2081 if (!privileged) break; // only allow in privileged code 2082 return _method_ForceInline; 2083 } 2084 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2085 if (_location != _in_method) break; // only allow for methods 2086 if (!privileged) break; // only allow in privileged code 2087 return _method_DontInline; 2088 } 2089 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2090 if (_location != _in_method) break; // only allow for methods 2091 if (!privileged) break; // only allow in privileged code 2092 return _method_InjectedProfile; 2093 } 2094 case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2095 if (_location != _in_method) break; // only allow for methods 2096 if (!privileged) break; // only allow in privileged code 2097 return _method_LambdaForm_Compiled; 2098 } 2099 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 2100 if (_location != _in_method) break; // only allow for methods 2101 if (!privileged) break; // only allow in privileged code 2102 return _method_Hidden; 2103 } 2104 case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): { 2105 if (_location != _in_method) break; // only allow for methods 2106 if (!privileged) break; // only allow in privileged code 2107 return _method_Scoped; 2108 } 2109 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): { 2110 if (_location != _in_method) break; // only allow for methods 2111 if (!privileged) break; // only allow in privileged code 2112 return _method_IntrinsicCandidate; 2113 } 2114 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2115 if (_location != _in_field) break; // only allow for fields 2116 if (!privileged) break; // only allow in privileged code 2117 return _field_Stable; 2118 } 2119 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2120 if (_location != _in_field && _location != _in_class) { 2121 break; // only allow for fields and classes 2122 } 2123 if (!EnableContended || (RestrictContended && !privileged)) { 2124 break; // honor privileges 2125 } 2126 return _jdk_internal_vm_annotation_Contended; 2127 } 2128 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2129 if (_location != _in_method) break; // only allow for methods 2130 if (RestrictReservedStack && !privileged) break; // honor privileges 2131 return _jdk_internal_vm_annotation_ReservedStackAccess; 2132 } 2133 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): { 2134 if (_location != _in_class) break; // only allow for classes 2135 if (!privileged) break; // only allow in priviledged code 2136 return _jdk_internal_ValueBased; 2137 } 2138 default: { 2139 break; 2140 } 2141 } 2142 return AnnotationCollector::_unknown; 2143 } 2144 2145 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2146 if (is_contended()) 2147 f->set_contended_group(contended_group()); 2148 if (is_stable()) 2149 f->set_stable(true); 2150 } 2151 2152 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2153 // If there's an error deallocate metadata for field annotations 2154 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2155 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2156 } 2157 2158 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2159 if (has_annotation(_method_CallerSensitive)) 2160 m->set_caller_sensitive(true); 2161 if (has_annotation(_method_ForceInline)) 2162 m->set_force_inline(true); 2163 if (has_annotation(_method_DontInline)) 2164 m->set_dont_inline(true); 2165 if (has_annotation(_method_InjectedProfile)) 2166 m->set_has_injected_profile(true); 2167 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2168 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2169 if (has_annotation(_method_Hidden)) 2170 m->set_hidden(true); 2171 if (has_annotation(_method_Scoped)) 2172 m->set_scoped(true); 2173 if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic()) 2174 m->set_intrinsic_candidate(true); 2175 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2176 m->set_has_reserved_stack_access(true); 2177 } 2178 2179 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2180 assert(ik != NULL, "invariant"); 2181 if (has_annotation(_jdk_internal_vm_annotation_Contended)) { 2182 ik->set_is_contended(is_contended()); 2183 } 2184 if (has_annotation(_jdk_internal_ValueBased)) { 2185 ik->set_has_value_based_class_annotation(); 2186 if (DiagnoseSyncOnValueBasedClasses) { 2187 ik->set_is_value_based(); 2188 } 2189 } 2190 } 2191 2192 #define MAX_ARGS_SIZE 255 2193 #define MAX_CODE_SIZE 65535 2194 #define INITIAL_MAX_LVT_NUMBER 256 2195 2196 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2197 * 2198 * Rules for LVT's and LVTT's are: 2199 * - There can be any number of LVT's and LVTT's. 2200 * - If there are n LVT's, it is the same as if there was just 2201 * one LVT containing all the entries from the n LVT's. 2202 * - There may be no more than one LVT entry per local variable. 2203 * Two LVT entries are 'equal' if these fields are the same: 2204 * start_pc, length, name, slot 2205 * - There may be no more than one LVTT entry per each LVT entry. 2206 * Each LVTT entry has to match some LVT entry. 2207 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2208 */ 2209 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2210 int lvt_cnt, 2211 u2* const localvariable_table_length, 2212 const unsafe_u2** const localvariable_table_start, 2213 int lvtt_cnt, 2214 u2* const localvariable_type_table_length, 2215 const unsafe_u2** const localvariable_type_table_start, 2216 TRAPS) { 2217 2218 ResourceMark rm(THREAD); 2219 2220 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2221 256, ResourceObj::RESOURCE_AREA, mtInternal, 2222 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2223 2224 LVT_HashTable* const table = new LVT_HashTable(); 2225 2226 // To fill LocalVariableTable in 2227 const Classfile_LVT_Element* cf_lvt; 2228 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2229 2230 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2231 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2232 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2233 copy_lvt_element(&cf_lvt[idx], lvt); 2234 // If no duplicates, add LVT elem in hashtable. 2235 if (table->put(*lvt, lvt) == false 2236 && _need_verify 2237 && _major_version >= JAVA_1_5_VERSION) { 2238 classfile_parse_error("Duplicated LocalVariableTable attribute " 2239 "entry for '%s' in class file %s", 2240 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2241 THREAD); 2242 return; 2243 } 2244 } 2245 } 2246 2247 // To merge LocalVariableTable and LocalVariableTypeTable 2248 const Classfile_LVT_Element* cf_lvtt; 2249 LocalVariableTableElement lvtt_elem; 2250 2251 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2252 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2253 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2254 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2255 LocalVariableTableElement** entry = table->get(lvtt_elem); 2256 if (entry == NULL) { 2257 if (_need_verify) { 2258 classfile_parse_error("LVTT entry for '%s' in class file %s " 2259 "does not match any LVT entry", 2260 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2261 THREAD); 2262 return; 2263 } 2264 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2265 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2266 "entry for '%s' in class file %s", 2267 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2268 THREAD); 2269 return; 2270 } else { 2271 // to add generic signatures into LocalVariableTable 2272 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2273 } 2274 } 2275 } 2276 } 2277 2278 2279 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2280 const u1* runtime_visible_annotations, 2281 int runtime_visible_annotations_length, 2282 const u1* runtime_invisible_annotations, 2283 int runtime_invisible_annotations_length, 2284 const u1* runtime_visible_parameter_annotations, 2285 int runtime_visible_parameter_annotations_length, 2286 const u1* runtime_invisible_parameter_annotations, 2287 int runtime_invisible_parameter_annotations_length, 2288 const u1* runtime_visible_type_annotations, 2289 int runtime_visible_type_annotations_length, 2290 const u1* runtime_invisible_type_annotations, 2291 int runtime_invisible_type_annotations_length, 2292 const u1* annotation_default, 2293 int annotation_default_length, 2294 TRAPS) { 2295 2296 AnnotationArray* a; 2297 2298 if (runtime_visible_annotations_length + 2299 runtime_invisible_annotations_length > 0) { 2300 a = assemble_annotations(runtime_visible_annotations, 2301 runtime_visible_annotations_length, 2302 runtime_invisible_annotations, 2303 runtime_invisible_annotations_length, 2304 CHECK); 2305 cm->set_method_annotations(a); 2306 } 2307 2308 if (runtime_visible_parameter_annotations_length + 2309 runtime_invisible_parameter_annotations_length > 0) { 2310 a = assemble_annotations(runtime_visible_parameter_annotations, 2311 runtime_visible_parameter_annotations_length, 2312 runtime_invisible_parameter_annotations, 2313 runtime_invisible_parameter_annotations_length, 2314 CHECK); 2315 cm->set_parameter_annotations(a); 2316 } 2317 2318 if (annotation_default_length > 0) { 2319 a = assemble_annotations(annotation_default, 2320 annotation_default_length, 2321 NULL, 2322 0, 2323 CHECK); 2324 cm->set_default_annotations(a); 2325 } 2326 2327 if (runtime_visible_type_annotations_length + 2328 runtime_invisible_type_annotations_length > 0) { 2329 a = assemble_annotations(runtime_visible_type_annotations, 2330 runtime_visible_type_annotations_length, 2331 runtime_invisible_type_annotations, 2332 runtime_invisible_type_annotations_length, 2333 CHECK); 2334 cm->set_type_annotations(a); 2335 } 2336 } 2337 2338 2339 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2340 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2341 // Method* to save footprint, so we only know the size of the resulting Method* when the 2342 // entire method attribute is parsed. 2343 // 2344 // The promoted_flags parameter is used to pass relevant access_flags 2345 // from the method back up to the containing klass. These flag values 2346 // are added to klass's access_flags. 2347 2348 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2349 bool is_interface, 2350 bool is_inline_type, 2351 bool is_abstract_type, 2352 const ConstantPool* cp, 2353 AccessFlags* const promoted_flags, 2354 TRAPS) { 2355 assert(cfs != NULL, "invariant"); 2356 assert(cp != NULL, "invariant"); 2357 assert(promoted_flags != NULL, "invariant"); 2358 2359 ResourceMark rm(THREAD); 2360 // Parse fixed parts: 2361 // access_flags, name_index, descriptor_index, attributes_count 2362 cfs->guarantee_more(8, CHECK_NULL); 2363 2364 int flags = cfs->get_u2_fast(); 2365 const u2 name_index = cfs->get_u2_fast(); 2366 const int cp_size = cp->length(); 2367 check_property( 2368 valid_symbol_at(name_index), 2369 "Illegal constant pool index %u for method name in class file %s", 2370 name_index, CHECK_NULL); 2371 const Symbol* const name = cp->symbol_at(name_index); 2372 verify_legal_method_name(name, CHECK_NULL); 2373 2374 const u2 signature_index = cfs->get_u2_fast(); 2375 guarantee_property( 2376 valid_symbol_at(signature_index), 2377 "Illegal constant pool index %u for method signature in class file %s", 2378 signature_index, CHECK_NULL); 2379 const Symbol* const signature = cp->symbol_at(signature_index); 2380 2381 if (name == vmSymbols::class_initializer_name()) { 2382 // We ignore the other access flags for a valid class initializer. 2383 // (JVM Spec 2nd ed., chapter 4.6) 2384 if (_major_version < 51) { // backward compatibility 2385 flags = JVM_ACC_STATIC; 2386 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2387 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0); 2388 } else { 2389 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD); 2390 return NULL; 2391 } 2392 } else { 2393 verify_legal_method_modifiers(flags, is_interface, is_inline_type, is_abstract_type, name, CHECK_NULL); 2394 } 2395 2396 if (name == vmSymbols::object_initializer_name()) { 2397 if (is_interface) { 2398 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD); 2399 return NULL; 2400 } else if ((!is_inline_type || is_abstract_type) && signature->is_void_method_signature()) { 2401 // OK, a constructor 2402 } else if (is_inline_type && !signature->is_void_method_signature()) { 2403 // also OK, a static factory, as long as the return value is good 2404 bool ok = false; 2405 SignatureStream ss((Symbol*) signature, true); 2406 while (!ss.at_return_type()) ss.next(); 2407 if (ss.is_reference()) { 2408 Symbol* ret = ss.as_symbol(); 2409 const Symbol* required = class_name(); 2410 if (is_hidden()) { 2411 // The original class name in hidden classes gets changed. So using 2412 // the original name in the return type is no longer valid. 2413 // Note that expecting the return type for inline hidden class factory 2414 // methods to be java.lang.Object works around a JVM Spec issue for 2415 // hidden classes. 2416 required = vmSymbols::java_lang_Object(); 2417 } 2418 ok = (ret == required); 2419 } 2420 if (!ok) { 2421 throwIllegalSignature("Method", name, signature, CHECK_0); 2422 } 2423 } else { 2424 // not OK, so throw the same error as in verify_legal_method_signature. 2425 throwIllegalSignature("Method", name, signature, CHECK_0); 2426 } 2427 // A declared <init> method must always be either a non-static 2428 // object constructor, with a void return, or else it must be a 2429 // static factory method, with a non-void return. No other 2430 // definition of <init> is possible. 2431 // 2432 // The verifier (in verify_invoke_instructions) will inspect the 2433 // signature of any attempt to invoke <init>, and ensures that it 2434 // returns non-void if and only if it is being invoked by 2435 // invokestatic, and void if and only if it is being invoked by 2436 // invokespecial. 2437 // 2438 // When a symbolic reference to <init> is resolved for a 2439 // particular invocation mode (special or static), the mode is 2440 // matched to the JVM_ACC_STATIC modifier of the <init> method. 2441 // Thus, it is impossible to statically invoke a constructor, and 2442 // impossible to "new + invokespecial" a static factory, either 2443 // through bytecode or through reflection. 2444 } 2445 2446 int args_size = -1; // only used when _need_verify is true 2447 if (_need_verify) { 2448 verify_legal_name_with_signature(name, signature, CHECK_NULL); 2449 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2450 verify_legal_method_signature(name, signature, CHECK_NULL); 2451 if (args_size > MAX_ARGS_SIZE) { 2452 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD); 2453 return NULL; 2454 } 2455 } 2456 2457 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2458 2459 // Default values for code and exceptions attribute elements 2460 u2 max_stack = 0; 2461 u2 max_locals = 0; 2462 u4 code_length = 0; 2463 const u1* code_start = 0; 2464 u2 exception_table_length = 0; 2465 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2466 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2467 u2 checked_exceptions_length = 0; 2468 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2469 CompressedLineNumberWriteStream* linenumber_table = NULL; 2470 int linenumber_table_length = 0; 2471 int total_lvt_length = 0; 2472 u2 lvt_cnt = 0; 2473 u2 lvtt_cnt = 0; 2474 bool lvt_allocated = false; 2475 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2476 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2477 u2* localvariable_table_length = NULL; 2478 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2479 u2* localvariable_type_table_length = NULL; 2480 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2481 int method_parameters_length = -1; 2482 const u1* method_parameters_data = NULL; 2483 bool method_parameters_seen = false; 2484 bool parsed_code_attribute = false; 2485 bool parsed_checked_exceptions_attribute = false; 2486 bool parsed_stackmap_attribute = false; 2487 // stackmap attribute - JDK1.5 2488 const u1* stackmap_data = NULL; 2489 int stackmap_data_length = 0; 2490 u2 generic_signature_index = 0; 2491 MethodAnnotationCollector parsed_annotations; 2492 const u1* runtime_visible_annotations = NULL; 2493 int runtime_visible_annotations_length = 0; 2494 const u1* runtime_invisible_annotations = NULL; 2495 int runtime_invisible_annotations_length = 0; 2496 const u1* runtime_visible_parameter_annotations = NULL; 2497 int runtime_visible_parameter_annotations_length = 0; 2498 const u1* runtime_invisible_parameter_annotations = NULL; 2499 int runtime_invisible_parameter_annotations_length = 0; 2500 const u1* runtime_visible_type_annotations = NULL; 2501 int runtime_visible_type_annotations_length = 0; 2502 const u1* runtime_invisible_type_annotations = NULL; 2503 int runtime_invisible_type_annotations_length = 0; 2504 bool runtime_invisible_annotations_exists = false; 2505 bool runtime_invisible_type_annotations_exists = false; 2506 bool runtime_invisible_parameter_annotations_exists = false; 2507 const u1* annotation_default = NULL; 2508 int annotation_default_length = 0; 2509 2510 // Parse code and exceptions attribute 2511 u2 method_attributes_count = cfs->get_u2_fast(); 2512 while (method_attributes_count--) { 2513 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2514 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2515 const u4 method_attribute_length = cfs->get_u4_fast(); 2516 check_property( 2517 valid_symbol_at(method_attribute_name_index), 2518 "Invalid method attribute name index %u in class file %s", 2519 method_attribute_name_index, CHECK_NULL); 2520 2521 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2522 if (method_attribute_name == vmSymbols::tag_code()) { 2523 // Parse Code attribute 2524 if (_need_verify) { 2525 guarantee_property( 2526 !access_flags.is_native() && !access_flags.is_abstract(), 2527 "Code attribute in native or abstract methods in class file %s", 2528 CHECK_NULL); 2529 } 2530 if (parsed_code_attribute) { 2531 classfile_parse_error("Multiple Code attributes in class file %s", 2532 THREAD); 2533 return NULL; 2534 } 2535 parsed_code_attribute = true; 2536 2537 // Stack size, locals size, and code size 2538 cfs->guarantee_more(8, CHECK_NULL); 2539 max_stack = cfs->get_u2_fast(); 2540 max_locals = cfs->get_u2_fast(); 2541 code_length = cfs->get_u4_fast(); 2542 if (_need_verify) { 2543 guarantee_property(args_size <= max_locals, 2544 "Arguments can't fit into locals in class file %s", 2545 CHECK_NULL); 2546 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2547 "Invalid method Code length %u in class file %s", 2548 code_length, CHECK_NULL); 2549 } 2550 // Code pointer 2551 code_start = cfs->current(); 2552 assert(code_start != NULL, "null code start"); 2553 cfs->guarantee_more(code_length, CHECK_NULL); 2554 cfs->skip_u1_fast(code_length); 2555 2556 // Exception handler table 2557 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2558 exception_table_length = cfs->get_u2_fast(); 2559 if (exception_table_length > 0) { 2560 exception_table_start = parse_exception_table(cfs, 2561 code_length, 2562 exception_table_length, 2563 CHECK_NULL); 2564 } 2565 2566 // Parse additional attributes in code attribute 2567 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2568 u2 code_attributes_count = cfs->get_u2_fast(); 2569 2570 unsigned int calculated_attribute_length = 0; 2571 2572 calculated_attribute_length = 2573 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2574 calculated_attribute_length += 2575 code_length + 2576 sizeof(exception_table_length) + 2577 sizeof(code_attributes_count) + 2578 exception_table_length * 2579 ( sizeof(u2) + // start_pc 2580 sizeof(u2) + // end_pc 2581 sizeof(u2) + // handler_pc 2582 sizeof(u2) ); // catch_type_index 2583 2584 while (code_attributes_count--) { 2585 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2586 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2587 const u4 code_attribute_length = cfs->get_u4_fast(); 2588 calculated_attribute_length += code_attribute_length + 2589 sizeof(code_attribute_name_index) + 2590 sizeof(code_attribute_length); 2591 check_property(valid_symbol_at(code_attribute_name_index), 2592 "Invalid code attribute name index %u in class file %s", 2593 code_attribute_name_index, 2594 CHECK_NULL); 2595 if (LoadLineNumberTables && 2596 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2597 // Parse and compress line number table 2598 parse_linenumber_table(code_attribute_length, 2599 code_length, 2600 &linenumber_table, 2601 CHECK_NULL); 2602 2603 } else if (LoadLocalVariableTables && 2604 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2605 // Parse local variable table 2606 if (!lvt_allocated) { 2607 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2608 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2609 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2610 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2611 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2612 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2613 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2614 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2615 lvt_allocated = true; 2616 } 2617 if (lvt_cnt == max_lvt_cnt) { 2618 max_lvt_cnt <<= 1; 2619 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2620 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2621 } 2622 localvariable_table_start[lvt_cnt] = 2623 parse_localvariable_table(cfs, 2624 code_length, 2625 max_locals, 2626 code_attribute_length, 2627 &localvariable_table_length[lvt_cnt], 2628 false, // is not LVTT 2629 CHECK_NULL); 2630 total_lvt_length += localvariable_table_length[lvt_cnt]; 2631 lvt_cnt++; 2632 } else if (LoadLocalVariableTypeTables && 2633 _major_version >= JAVA_1_5_VERSION && 2634 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2635 if (!lvt_allocated) { 2636 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2637 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2638 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2639 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2640 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2641 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2642 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2643 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2644 lvt_allocated = true; 2645 } 2646 // Parse local variable type table 2647 if (lvtt_cnt == max_lvtt_cnt) { 2648 max_lvtt_cnt <<= 1; 2649 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2650 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2651 } 2652 localvariable_type_table_start[lvtt_cnt] = 2653 parse_localvariable_table(cfs, 2654 code_length, 2655 max_locals, 2656 code_attribute_length, 2657 &localvariable_type_table_length[lvtt_cnt], 2658 true, // is LVTT 2659 CHECK_NULL); 2660 lvtt_cnt++; 2661 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2662 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2663 // Stack map is only needed by the new verifier in JDK1.5. 2664 if (parsed_stackmap_attribute) { 2665 classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD); 2666 return NULL; 2667 } 2668 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2669 stackmap_data_length = code_attribute_length; 2670 parsed_stackmap_attribute = true; 2671 } else { 2672 // Skip unknown attributes 2673 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2674 } 2675 } 2676 // check method attribute length 2677 if (_need_verify) { 2678 guarantee_property(method_attribute_length == calculated_attribute_length, 2679 "Code segment has wrong length in class file %s", 2680 CHECK_NULL); 2681 } 2682 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2683 // Parse Exceptions attribute 2684 if (parsed_checked_exceptions_attribute) { 2685 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2686 THREAD); 2687 return NULL; 2688 } 2689 parsed_checked_exceptions_attribute = true; 2690 checked_exceptions_start = 2691 parse_checked_exceptions(cfs, 2692 &checked_exceptions_length, 2693 method_attribute_length, 2694 CHECK_NULL); 2695 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2696 // reject multiple method parameters 2697 if (method_parameters_seen) { 2698 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2699 THREAD); 2700 return NULL; 2701 } 2702 method_parameters_seen = true; 2703 method_parameters_length = cfs->get_u1_fast(); 2704 const u2 real_length = (method_parameters_length * 4u) + 1u; 2705 if (method_attribute_length != real_length) { 2706 classfile_parse_error( 2707 "Invalid MethodParameters method attribute length %u in class file", 2708 method_attribute_length, THREAD); 2709 return NULL; 2710 } 2711 method_parameters_data = cfs->current(); 2712 cfs->skip_u2_fast(method_parameters_length); 2713 cfs->skip_u2_fast(method_parameters_length); 2714 // ignore this attribute if it cannot be reflected 2715 if (!vmClasses::Parameter_klass_loaded()) 2716 method_parameters_length = -1; 2717 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2718 if (method_attribute_length != 0) { 2719 classfile_parse_error( 2720 "Invalid Synthetic method attribute length %u in class file %s", 2721 method_attribute_length, THREAD); 2722 return NULL; 2723 } 2724 // Should we check that there hasn't already been a synthetic attribute? 2725 access_flags.set_is_synthetic(); 2726 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2727 if (method_attribute_length != 0) { 2728 classfile_parse_error( 2729 "Invalid Deprecated method attribute length %u in class file %s", 2730 method_attribute_length, THREAD); 2731 return NULL; 2732 } 2733 } else if (_major_version >= JAVA_1_5_VERSION) { 2734 if (method_attribute_name == vmSymbols::tag_signature()) { 2735 if (generic_signature_index != 0) { 2736 classfile_parse_error( 2737 "Multiple Signature attributes for method in class file %s", 2738 THREAD); 2739 return NULL; 2740 } 2741 if (method_attribute_length != 2) { 2742 classfile_parse_error( 2743 "Invalid Signature attribute length %u in class file %s", 2744 method_attribute_length, THREAD); 2745 return NULL; 2746 } 2747 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2748 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2749 if (runtime_visible_annotations != NULL) { 2750 classfile_parse_error( 2751 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2752 THREAD); 2753 return NULL; 2754 } 2755 runtime_visible_annotations_length = method_attribute_length; 2756 runtime_visible_annotations = cfs->current(); 2757 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2758 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2759 parse_annotations(cp, 2760 runtime_visible_annotations, 2761 runtime_visible_annotations_length, 2762 &parsed_annotations, 2763 _loader_data, 2764 _can_access_vm_annotations); 2765 cfs->skip_u1_fast(runtime_visible_annotations_length); 2766 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2767 if (runtime_invisible_annotations_exists) { 2768 classfile_parse_error( 2769 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2770 THREAD); 2771 return NULL; 2772 } 2773 runtime_invisible_annotations_exists = true; 2774 if (PreserveAllAnnotations) { 2775 runtime_invisible_annotations_length = method_attribute_length; 2776 runtime_invisible_annotations = cfs->current(); 2777 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2778 } 2779 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2780 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2781 if (runtime_visible_parameter_annotations != NULL) { 2782 classfile_parse_error( 2783 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2784 THREAD); 2785 return NULL; 2786 } 2787 runtime_visible_parameter_annotations_length = method_attribute_length; 2788 runtime_visible_parameter_annotations = cfs->current(); 2789 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2790 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2791 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2792 if (runtime_invisible_parameter_annotations_exists) { 2793 classfile_parse_error( 2794 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2795 THREAD); 2796 return NULL; 2797 } 2798 runtime_invisible_parameter_annotations_exists = true; 2799 if (PreserveAllAnnotations) { 2800 runtime_invisible_parameter_annotations_length = method_attribute_length; 2801 runtime_invisible_parameter_annotations = cfs->current(); 2802 assert(runtime_invisible_parameter_annotations != NULL, 2803 "null invisible parameter annotations"); 2804 } 2805 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2806 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2807 if (annotation_default != NULL) { 2808 classfile_parse_error( 2809 "Multiple AnnotationDefault attributes for method in class file %s", 2810 THREAD); 2811 return NULL; 2812 } 2813 annotation_default_length = method_attribute_length; 2814 annotation_default = cfs->current(); 2815 assert(annotation_default != NULL, "null annotation default"); 2816 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2817 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2818 if (runtime_visible_type_annotations != NULL) { 2819 classfile_parse_error( 2820 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2821 THREAD); 2822 return NULL; 2823 } 2824 runtime_visible_type_annotations_length = method_attribute_length; 2825 runtime_visible_type_annotations = cfs->current(); 2826 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2827 // No need for the VM to parse Type annotations 2828 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2829 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2830 if (runtime_invisible_type_annotations_exists) { 2831 classfile_parse_error( 2832 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2833 THREAD); 2834 return NULL; 2835 } else { 2836 runtime_invisible_type_annotations_exists = true; 2837 } 2838 if (PreserveAllAnnotations) { 2839 runtime_invisible_type_annotations_length = method_attribute_length; 2840 runtime_invisible_type_annotations = cfs->current(); 2841 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2842 } 2843 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2844 } else { 2845 // Skip unknown attributes 2846 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2847 } 2848 } else { 2849 // Skip unknown attributes 2850 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2851 } 2852 } 2853 2854 if (linenumber_table != NULL) { 2855 linenumber_table->write_terminator(); 2856 linenumber_table_length = linenumber_table->position(); 2857 } 2858 2859 // Make sure there's at least one Code attribute in non-native/non-abstract method 2860 if (_need_verify) { 2861 guarantee_property(access_flags.is_native() || 2862 access_flags.is_abstract() || 2863 parsed_code_attribute, 2864 "Absent Code attribute in method that is not native or abstract in class file %s", 2865 CHECK_NULL); 2866 } 2867 2868 // All sizing information for a Method* is finally available, now create it 2869 InlineTableSizes sizes( 2870 total_lvt_length, 2871 linenumber_table_length, 2872 exception_table_length, 2873 checked_exceptions_length, 2874 method_parameters_length, 2875 generic_signature_index, 2876 runtime_visible_annotations_length + 2877 runtime_invisible_annotations_length, 2878 runtime_visible_parameter_annotations_length + 2879 runtime_invisible_parameter_annotations_length, 2880 runtime_visible_type_annotations_length + 2881 runtime_invisible_type_annotations_length, 2882 annotation_default_length, 2883 0); 2884 2885 Method* const m = Method::allocate(_loader_data, 2886 code_length, 2887 access_flags, 2888 &sizes, 2889 ConstMethod::NORMAL, 2890 _cp->symbol_at(name_index), 2891 CHECK_NULL); 2892 2893 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2894 2895 // Fill in information from fixed part (access_flags already set) 2896 m->set_constants(_cp); 2897 m->set_name_index(name_index); 2898 m->set_signature_index(signature_index); 2899 m->compute_from_signature(cp->symbol_at(signature_index)); 2900 assert(args_size < 0 || args_size == m->size_of_parameters(), ""); 2901 2902 // Fill in code attribute information 2903 m->set_max_stack(max_stack); 2904 m->set_max_locals(max_locals); 2905 if (stackmap_data != NULL) { 2906 m->constMethod()->copy_stackmap_data(_loader_data, 2907 (u1*)stackmap_data, 2908 stackmap_data_length, 2909 CHECK_NULL); 2910 } 2911 2912 // Copy byte codes 2913 m->set_code((u1*)code_start); 2914 2915 // Copy line number table 2916 if (linenumber_table != NULL) { 2917 memcpy(m->compressed_linenumber_table(), 2918 linenumber_table->buffer(), 2919 linenumber_table_length); 2920 } 2921 2922 // Copy exception table 2923 if (exception_table_length > 0) { 2924 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2925 m->exception_table_start(), 2926 exception_table_length * sizeof(ExceptionTableElement), 2927 sizeof(u2)); 2928 } 2929 2930 // Copy method parameters 2931 if (method_parameters_length > 0) { 2932 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2933 for (int i = 0; i < method_parameters_length; i++) { 2934 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2935 method_parameters_data += 2; 2936 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2937 method_parameters_data += 2; 2938 } 2939 } 2940 2941 // Copy checked exceptions 2942 if (checked_exceptions_length > 0) { 2943 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2944 m->checked_exceptions_start(), 2945 checked_exceptions_length * sizeof(CheckedExceptionElement), 2946 sizeof(u2)); 2947 } 2948 2949 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2950 if (total_lvt_length > 0) { 2951 promoted_flags->set_has_localvariable_table(); 2952 copy_localvariable_table(m->constMethod(), 2953 lvt_cnt, 2954 localvariable_table_length, 2955 localvariable_table_start, 2956 lvtt_cnt, 2957 localvariable_type_table_length, 2958 localvariable_type_table_start, 2959 CHECK_NULL); 2960 } 2961 2962 if (parsed_annotations.has_any_annotations()) 2963 parsed_annotations.apply_to(methodHandle(THREAD, m)); 2964 2965 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'. 2966 m->set_hidden(true); 2967 } 2968 2969 // Copy annotations 2970 copy_method_annotations(m->constMethod(), 2971 runtime_visible_annotations, 2972 runtime_visible_annotations_length, 2973 runtime_invisible_annotations, 2974 runtime_invisible_annotations_length, 2975 runtime_visible_parameter_annotations, 2976 runtime_visible_parameter_annotations_length, 2977 runtime_invisible_parameter_annotations, 2978 runtime_invisible_parameter_annotations_length, 2979 runtime_visible_type_annotations, 2980 runtime_visible_type_annotations_length, 2981 runtime_invisible_type_annotations, 2982 runtime_invisible_type_annotations_length, 2983 annotation_default, 2984 annotation_default_length, 2985 CHECK_NULL); 2986 2987 if (InstanceKlass::is_finalization_enabled() && 2988 name == vmSymbols::finalize_method_name() && 2989 signature == vmSymbols::void_method_signature()) { 2990 if (m->is_empty_method()) { 2991 _has_empty_finalizer = true; 2992 } else { 2993 _has_finalizer = true; 2994 } 2995 } 2996 if (name == vmSymbols::object_initializer_name() && 2997 signature == vmSymbols::void_method_signature() && 2998 m->is_vanilla_constructor()) { 2999 _has_vanilla_constructor = true; 3000 } 3001 3002 NOT_PRODUCT(m->verify()); 3003 return m; 3004 } 3005 3006 3007 // The promoted_flags parameter is used to pass relevant access_flags 3008 // from the methods back up to the containing klass. These flag values 3009 // are added to klass's access_flags. 3010 // Side-effects: populates the _methods field in the parser 3011 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 3012 bool is_interface, 3013 bool is_inline_type, 3014 bool is_abstract_type, 3015 AccessFlags* promoted_flags, 3016 bool* has_final_method, 3017 bool* declares_nonstatic_concrete_methods, 3018 TRAPS) { 3019 assert(cfs != NULL, "invariant"); 3020 assert(promoted_flags != NULL, "invariant"); 3021 assert(has_final_method != NULL, "invariant"); 3022 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 3023 3024 assert(NULL == _methods, "invariant"); 3025 3026 cfs->guarantee_more(2, CHECK); // length 3027 const u2 length = cfs->get_u2_fast(); 3028 if (length == 0) { 3029 _methods = Universe::the_empty_method_array(); 3030 } else { 3031 _methods = MetadataFactory::new_array<Method*>(_loader_data, 3032 length, 3033 NULL, 3034 CHECK); 3035 3036 for (int index = 0; index < length; index++) { 3037 Method* method = parse_method(cfs, 3038 is_interface, 3039 is_inline_type, 3040 is_abstract_type, 3041 _cp, 3042 promoted_flags, 3043 CHECK); 3044 3045 if (method->is_final()) { 3046 *has_final_method = true; 3047 } 3048 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 3049 // used for interface initialization, and default method inheritance analysis 3050 if (is_interface && !(*declares_nonstatic_concrete_methods) 3051 && !method->is_abstract() && !method->is_static()) { 3052 *declares_nonstatic_concrete_methods = true; 3053 } 3054 _methods->at_put(index, method); 3055 } 3056 3057 if (_need_verify && length > 1) { 3058 // Check duplicated methods 3059 ResourceMark rm(THREAD); 3060 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 3061 THREAD, NameSigHash*, HASH_ROW_SIZE); 3062 initialize_hashtable(names_and_sigs); 3063 bool dup = false; 3064 const Symbol* name = NULL; 3065 const Symbol* sig = NULL; 3066 { 3067 debug_only(NoSafepointVerifier nsv;) 3068 for (int i = 0; i < length; i++) { 3069 const Method* const m = _methods->at(i); 3070 name = m->name(); 3071 sig = m->signature(); 3072 // If no duplicates, add name/signature in hashtable names_and_sigs. 3073 if (!put_after_lookup(name, sig, names_and_sigs)) { 3074 dup = true; 3075 break; 3076 } 3077 } 3078 } 3079 if (dup) { 3080 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 3081 name->as_C_string(), sig->as_klass_external_name(), THREAD); 3082 } 3083 } 3084 } 3085 } 3086 3087 static const intArray* sort_methods(Array<Method*>* methods) { 3088 const int length = methods->length(); 3089 // If JVMTI original method ordering or sharing is enabled we have to 3090 // remember the original class file ordering. 3091 // We temporarily use the vtable_index field in the Method* to store the 3092 // class file index, so we can read in after calling qsort. 3093 // Put the method ordering in the shared archive. 3094 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 3095 for (int index = 0; index < length; index++) { 3096 Method* const m = methods->at(index); 3097 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3098 m->set_vtable_index(index); 3099 } 3100 } 3101 // Sort method array by ascending method name (for faster lookups & vtable construction) 3102 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3103 Method::sort_methods(methods); 3104 3105 intArray* method_ordering = NULL; 3106 // If JVMTI original method ordering or sharing is enabled construct int 3107 // array remembering the original ordering 3108 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 3109 method_ordering = new intArray(length, length, -1); 3110 for (int index = 0; index < length; index++) { 3111 Method* const m = methods->at(index); 3112 const int old_index = m->vtable_index(); 3113 assert(old_index >= 0 && old_index < length, "invalid method index"); 3114 method_ordering->at_put(index, old_index); 3115 m->set_vtable_index(Method::invalid_vtable_index); 3116 } 3117 } 3118 return method_ordering; 3119 } 3120 3121 // Parse generic_signature attribute for methods and fields 3122 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3123 TRAPS) { 3124 assert(cfs != NULL, "invariant"); 3125 3126 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3127 const u2 generic_signature_index = cfs->get_u2_fast(); 3128 check_property( 3129 valid_symbol_at(generic_signature_index), 3130 "Invalid Signature attribute at constant pool index %u in class file %s", 3131 generic_signature_index, CHECK_0); 3132 return generic_signature_index; 3133 } 3134 3135 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3136 TRAPS) { 3137 3138 assert(cfs != NULL, "invariant"); 3139 3140 cfs->guarantee_more(2, CHECK); // sourcefile_index 3141 const u2 sourcefile_index = cfs->get_u2_fast(); 3142 check_property( 3143 valid_symbol_at(sourcefile_index), 3144 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3145 sourcefile_index, CHECK); 3146 set_class_sourcefile_index(sourcefile_index); 3147 } 3148 3149 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3150 int length, 3151 TRAPS) { 3152 assert(cfs != NULL, "invariant"); 3153 3154 const u1* const sde_buffer = cfs->current(); 3155 assert(sde_buffer != NULL, "null sde buffer"); 3156 3157 // Don't bother storing it if there is no way to retrieve it 3158 if (JvmtiExport::can_get_source_debug_extension()) { 3159 assert((length+1) > length, "Overflow checking"); 3160 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3161 for (int i = 0; i < length; i++) { 3162 sde[i] = sde_buffer[i]; 3163 } 3164 sde[length] = '\0'; 3165 set_class_sde_buffer((const char*)sde, length); 3166 } 3167 // Got utf8 string, set stream position forward 3168 cfs->skip_u1(length, CHECK); 3169 } 3170 3171 3172 // Inner classes can be static, private or protected (classic VM does this) 3173 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3174 JVM_ACC_PRIVATE | \ 3175 JVM_ACC_PROTECTED | \ 3176 JVM_ACC_STATIC \ 3177 ) 3178 3179 // Find index of the InnerClasses entry for the specified inner_class_info_index. 3180 // Return -1 if none is found. 3181 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 3182 Symbol* cp_klass_name = cp->klass_name_at(inner); 3183 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 3184 int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 3185 if (cp->klass_name_at(idx_inner) == cp_klass_name) { 3186 return idx; 3187 } 3188 } 3189 return -1; 3190 } 3191 3192 // Return the outer_class_info_index for the InnerClasses entry containing the 3193 // specified inner_class_info_index. Return -1 if no InnerClasses entry is found. 3194 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) { 3195 if (inner == 0) return -1; 3196 int idx = inner_classes_find_index(inner_classes, inner, cp, length); 3197 if (idx == -1) return -1; 3198 int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3199 return result; 3200 } 3201 3202 // Return true if circularity is found, false if no circularity is found. 3203 // Use Floyd's cycle finding algorithm. 3204 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) { 3205 int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); 3206 int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); 3207 3208 while (fast != -1 && fast != 0) { 3209 if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) { 3210 return true; // found a circularity 3211 } 3212 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3213 if (fast == -1) return false; 3214 fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); 3215 if (fast == -1) return false; 3216 slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length); 3217 assert(slow != -1, "sanity check"); 3218 } 3219 return false; 3220 } 3221 3222 // Loop through each InnerClasses entry checking for circularities and duplications 3223 // with other entries. If duplicate entries are found then throw CFE. Otherwise, 3224 // return true if a circularity or entries with duplicate inner_class_info_indexes 3225 // are found. 3226 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) { 3227 // Loop through each InnerClasses entry. 3228 for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { 3229 // Return true if there are circular entries. 3230 if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) { 3231 return true; 3232 } 3233 // Check if there are duplicate entries or entries with the same inner_class_info_index. 3234 for (int y = idx + InstanceKlass::inner_class_next_offset; y < length; 3235 y += InstanceKlass::inner_class_next_offset) { 3236 3237 // 4347400: make sure there's no duplicate entry in the classes array 3238 if (_major_version >= JAVA_1_5_VERSION) { 3239 guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) || 3240 _inner_classes->at(idx+1) != _inner_classes->at(y+1) || 3241 _inner_classes->at(idx+2) != _inner_classes->at(y+2) || 3242 _inner_classes->at(idx+3) != _inner_classes->at(y+3)), 3243 "Duplicate entry in InnerClasses attribute in class file %s", 3244 CHECK_(true)); 3245 } 3246 // Return true if there are two entries with the same inner_class_info_index. 3247 if (_inner_classes->at(y) == _inner_classes->at(idx)) { 3248 return true; 3249 } 3250 } 3251 } 3252 return false; 3253 } 3254 3255 // Return number of classes in the inner classes attribute table 3256 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3257 const ConstantPool* cp, 3258 const u1* const inner_classes_attribute_start, 3259 bool parsed_enclosingmethod_attribute, 3260 u2 enclosing_method_class_index, 3261 u2 enclosing_method_method_index, 3262 TRAPS) { 3263 const u1* const current_mark = cfs->current(); 3264 u2 length = 0; 3265 if (inner_classes_attribute_start != NULL) { 3266 cfs->set_current(inner_classes_attribute_start); 3267 cfs->guarantee_more(2, CHECK_0); // length 3268 length = cfs->get_u2_fast(); 3269 } 3270 3271 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3272 // method data: 3273 // [inner_class_info_index, 3274 // outer_class_info_index, 3275 // inner_name_index, 3276 // inner_class_access_flags, 3277 // ... 3278 // enclosing_method_class_index, 3279 // enclosing_method_method_index] 3280 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3281 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3282 _inner_classes = inner_classes; 3283 3284 int index = 0; 3285 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3286 for (int n = 0; n < length; n++) { 3287 // Inner class index 3288 const u2 inner_class_info_index = cfs->get_u2_fast(); 3289 check_property( 3290 valid_klass_reference_at(inner_class_info_index), 3291 "inner_class_info_index %u has bad constant type in class file %s", 3292 inner_class_info_index, CHECK_0); 3293 // Outer class index 3294 const u2 outer_class_info_index = cfs->get_u2_fast(); 3295 check_property( 3296 outer_class_info_index == 0 || 3297 valid_klass_reference_at(outer_class_info_index), 3298 "outer_class_info_index %u has bad constant type in class file %s", 3299 outer_class_info_index, CHECK_0); 3300 3301 if (outer_class_info_index != 0) { 3302 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index); 3303 char* bytes = (char*)outer_class_name->bytes(); 3304 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY, 3305 "Outer class is an array class in class file %s", CHECK_0); 3306 } 3307 // Inner class name 3308 const u2 inner_name_index = cfs->get_u2_fast(); 3309 check_property( 3310 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3311 "inner_name_index %u has bad constant type in class file %s", 3312 inner_name_index, CHECK_0); 3313 if (_need_verify) { 3314 guarantee_property(inner_class_info_index != outer_class_info_index, 3315 "Class is both outer and inner class in class file %s", CHECK_0); 3316 } 3317 3318 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS; 3319 // JVM_ACC_MODULE is defined in JDK-9 and later. 3320 if (_major_version >= JAVA_9_VERSION) { 3321 recognized_modifiers |= JVM_ACC_MODULE; 3322 } 3323 // JVM_ACC_VALUE and JVM_ACC_PRIMITIVE are defined for class file version 62 and later 3324 if (supports_inline_types()) { 3325 recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE; 3326 } 3327 3328 // Access flags 3329 jint flags = cfs->get_u2_fast() & recognized_modifiers; 3330 3331 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3332 // Set abstract bit for old class files for backward compatibility 3333 flags |= JVM_ACC_ABSTRACT; 3334 } 3335 verify_legal_class_modifiers(flags, CHECK_0); 3336 AccessFlags inner_access_flags(flags); 3337 3338 inner_classes->at_put(index++, inner_class_info_index); 3339 inner_classes->at_put(index++, outer_class_info_index); 3340 inner_classes->at_put(index++, inner_name_index); 3341 inner_classes->at_put(index++, inner_access_flags.as_short()); 3342 } 3343 3344 // Check for circular and duplicate entries. 3345 bool has_circularity = false; 3346 if (_need_verify) { 3347 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0); 3348 if (has_circularity) { 3349 // If circularity check failed then ignore InnerClasses attribute. 3350 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 3351 index = 0; 3352 if (parsed_enclosingmethod_attribute) { 3353 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0); 3354 _inner_classes = inner_classes; 3355 } else { 3356 _inner_classes = Universe::the_empty_short_array(); 3357 } 3358 } 3359 } 3360 // Set EnclosingMethod class and method indexes. 3361 if (parsed_enclosingmethod_attribute) { 3362 inner_classes->at_put(index++, enclosing_method_class_index); 3363 inner_classes->at_put(index++, enclosing_method_method_index); 3364 } 3365 assert(index == size || has_circularity, "wrong size"); 3366 3367 // Restore buffer's current position. 3368 cfs->set_current(current_mark); 3369 3370 return length; 3371 } 3372 3373 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3374 const u1* const nest_members_attribute_start, 3375 TRAPS) { 3376 const u1* const current_mark = cfs->current(); 3377 u2 length = 0; 3378 if (nest_members_attribute_start != NULL) { 3379 cfs->set_current(nest_members_attribute_start); 3380 cfs->guarantee_more(2, CHECK_0); // length 3381 length = cfs->get_u2_fast(); 3382 } 3383 const int size = length; 3384 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3385 _nest_members = nest_members; 3386 3387 int index = 0; 3388 cfs->guarantee_more(2 * length, CHECK_0); 3389 for (int n = 0; n < length; n++) { 3390 const u2 class_info_index = cfs->get_u2_fast(); 3391 check_property( 3392 valid_klass_reference_at(class_info_index), 3393 "Nest member class_info_index %u has bad constant type in class file %s", 3394 class_info_index, CHECK_0); 3395 nest_members->at_put(index++, class_info_index); 3396 } 3397 assert(index == size, "wrong size"); 3398 3399 // Restore buffer's current position. 3400 cfs->set_current(current_mark); 3401 3402 return length; 3403 } 3404 3405 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs, 3406 const u1* const permitted_subclasses_attribute_start, 3407 TRAPS) { 3408 const u1* const current_mark = cfs->current(); 3409 u2 length = 0; 3410 if (permitted_subclasses_attribute_start != NULL) { 3411 cfs->set_current(permitted_subclasses_attribute_start); 3412 cfs->guarantee_more(2, CHECK_0); // length 3413 length = cfs->get_u2_fast(); 3414 } 3415 const int size = length; 3416 Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3417 _permitted_subclasses = permitted_subclasses; 3418 3419 if (length > 0) { 3420 int index = 0; 3421 cfs->guarantee_more(2 * length, CHECK_0); 3422 for (int n = 0; n < length; n++) { 3423 const u2 class_info_index = cfs->get_u2_fast(); 3424 check_property( 3425 valid_klass_reference_at(class_info_index), 3426 "Permitted subclass class_info_index %u has bad constant type in class file %s", 3427 class_info_index, CHECK_0); 3428 permitted_subclasses->at_put(index++, class_info_index); 3429 } 3430 assert(index == size, "wrong size"); 3431 } 3432 3433 // Restore buffer's current position. 3434 cfs->set_current(current_mark); 3435 3436 return length; 3437 } 3438 3439 u2 ClassFileParser::parse_classfile_preload_attribute(const ClassFileStream* const cfs, 3440 const u1* const preload_attribute_start, 3441 TRAPS) { 3442 const u1* const current_mark = cfs->current(); 3443 u2 length = 0; 3444 if (preload_attribute_start != NULL) { 3445 cfs->set_current(preload_attribute_start); 3446 cfs->guarantee_more(2, CHECK_0); // length 3447 length = cfs->get_u2_fast(); 3448 } 3449 const int size = length; 3450 Array<u2>* const preload_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3451 _preload_classes = preload_classes; 3452 if (length > 0) { 3453 int index = 0; 3454 cfs->guarantee_more(2 * length, CHECK_0); 3455 for (int n = 0; n < length; n++) { 3456 const u2 class_info_index = cfs->get_u2_fast(); 3457 check_property( 3458 valid_klass_reference_at(class_info_index), 3459 "Preload class_info_index %u has bad constant type in class file %s", 3460 class_info_index, CHECK_0); 3461 preload_classes->at_put(index++, class_info_index); 3462 } 3463 assert(index == size, "wrong size"); 3464 } 3465 3466 // Restore buffer's current position. 3467 cfs->set_current(current_mark); 3468 3469 return length; 3470 } 3471 3472 // Record { 3473 // u2 attribute_name_index; 3474 // u4 attribute_length; 3475 // u2 components_count; 3476 // component_info components[components_count]; 3477 // } 3478 // component_info { 3479 // u2 name_index; 3480 // u2 descriptor_index 3481 // u2 attributes_count; 3482 // attribute_info_attributes[attributes_count]; 3483 // } 3484 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, 3485 const ConstantPool* cp, 3486 const u1* const record_attribute_start, 3487 TRAPS) { 3488 const u1* const current_mark = cfs->current(); 3489 int components_count = 0; 3490 unsigned int calculate_attr_size = 0; 3491 if (record_attribute_start != NULL) { 3492 cfs->set_current(record_attribute_start); 3493 cfs->guarantee_more(2, CHECK_0); // num of components 3494 components_count = (int)cfs->get_u2_fast(); 3495 calculate_attr_size = 2; 3496 } 3497 3498 Array<RecordComponent*>* const record_components = 3499 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0); 3500 _record_components = record_components; 3501 3502 for (int x = 0; x < components_count; x++) { 3503 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count 3504 3505 const u2 name_index = cfs->get_u2_fast(); 3506 check_property(valid_symbol_at(name_index), 3507 "Invalid constant pool index %u for name in Record attribute in class file %s", 3508 name_index, CHECK_0); 3509 const Symbol* const name = cp->symbol_at(name_index); 3510 verify_legal_field_name(name, CHECK_0); 3511 3512 const u2 descriptor_index = cfs->get_u2_fast(); 3513 check_property(valid_symbol_at(descriptor_index), 3514 "Invalid constant pool index %u for descriptor in Record attribute in class file %s", 3515 descriptor_index, CHECK_0); 3516 const Symbol* const descr = cp->symbol_at(descriptor_index); 3517 verify_legal_field_signature(name, descr, CHECK_0); 3518 3519 const u2 attributes_count = cfs->get_u2_fast(); 3520 calculate_attr_size += 6; 3521 u2 generic_sig_index = 0; 3522 const u1* runtime_visible_annotations = NULL; 3523 int runtime_visible_annotations_length = 0; 3524 const u1* runtime_invisible_annotations = NULL; 3525 int runtime_invisible_annotations_length = 0; 3526 bool runtime_invisible_annotations_exists = false; 3527 const u1* runtime_visible_type_annotations = NULL; 3528 int runtime_visible_type_annotations_length = 0; 3529 const u1* runtime_invisible_type_annotations = NULL; 3530 int runtime_invisible_type_annotations_length = 0; 3531 bool runtime_invisible_type_annotations_exists = false; 3532 3533 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, 3534 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. 3535 for (int y = 0; y < attributes_count; y++) { 3536 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length 3537 const u2 attribute_name_index = cfs->get_u2_fast(); 3538 const u4 attribute_length = cfs->get_u4_fast(); 3539 calculate_attr_size += 6; 3540 check_property( 3541 valid_symbol_at(attribute_name_index), 3542 "Invalid Record attribute name index %u in class file %s", 3543 attribute_name_index, CHECK_0); 3544 3545 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 3546 if (attribute_name == vmSymbols::tag_signature()) { 3547 if (generic_sig_index != 0) { 3548 classfile_parse_error( 3549 "Multiple Signature attributes for Record component in class file %s", 3550 THREAD); 3551 return 0; 3552 } 3553 if (attribute_length != 2) { 3554 classfile_parse_error( 3555 "Invalid Signature attribute length %u in Record component in class file %s", 3556 attribute_length, THREAD); 3557 return 0; 3558 } 3559 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); 3560 3561 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 3562 if (runtime_visible_annotations != NULL) { 3563 classfile_parse_error( 3564 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD); 3565 return 0; 3566 } 3567 runtime_visible_annotations_length = attribute_length; 3568 runtime_visible_annotations = cfs->current(); 3569 3570 assert(runtime_visible_annotations != NULL, "null record component visible annotation"); 3571 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); 3572 cfs->skip_u1_fast(runtime_visible_annotations_length); 3573 3574 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 3575 if (runtime_invisible_annotations_exists) { 3576 classfile_parse_error( 3577 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD); 3578 return 0; 3579 } 3580 runtime_invisible_annotations_exists = true; 3581 if (PreserveAllAnnotations) { 3582 runtime_invisible_annotations_length = attribute_length; 3583 runtime_invisible_annotations = cfs->current(); 3584 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation"); 3585 } 3586 cfs->skip_u1(attribute_length, CHECK_0); 3587 3588 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 3589 if (runtime_visible_type_annotations != NULL) { 3590 classfile_parse_error( 3591 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3592 return 0; 3593 } 3594 runtime_visible_type_annotations_length = attribute_length; 3595 runtime_visible_type_annotations = cfs->current(); 3596 3597 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation"); 3598 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); 3599 cfs->skip_u1_fast(runtime_visible_type_annotations_length); 3600 3601 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 3602 if (runtime_invisible_type_annotations_exists) { 3603 classfile_parse_error( 3604 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD); 3605 return 0; 3606 } 3607 runtime_invisible_type_annotations_exists = true; 3608 if (PreserveAllAnnotations) { 3609 runtime_invisible_type_annotations_length = attribute_length; 3610 runtime_invisible_type_annotations = cfs->current(); 3611 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation"); 3612 } 3613 cfs->skip_u1(attribute_length, CHECK_0); 3614 3615 } else { 3616 // Skip unknown attributes 3617 cfs->skip_u1(attribute_length, CHECK_0); 3618 } 3619 calculate_attr_size += attribute_length; 3620 } // End of attributes For loop 3621 3622 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations, 3623 runtime_visible_annotations_length, 3624 runtime_invisible_annotations, 3625 runtime_invisible_annotations_length, 3626 CHECK_0); 3627 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations, 3628 runtime_visible_type_annotations_length, 3629 runtime_invisible_type_annotations, 3630 runtime_invisible_type_annotations_length, 3631 CHECK_0); 3632 3633 RecordComponent* record_component = 3634 RecordComponent::allocate(_loader_data, name_index, descriptor_index, 3635 attributes_count, generic_sig_index, 3636 annotations, type_annotations, CHECK_0); 3637 record_components->at_put(x, record_component); 3638 } // End of component processing loop 3639 3640 // Restore buffer's current position. 3641 cfs->set_current(current_mark); 3642 return calculate_attr_size; 3643 } 3644 3645 void ClassFileParser::parse_classfile_synthetic_attribute() { 3646 set_class_synthetic_flag(true); 3647 } 3648 3649 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3650 assert(cfs != NULL, "invariant"); 3651 3652 const u2 signature_index = cfs->get_u2(CHECK); 3653 check_property( 3654 valid_symbol_at(signature_index), 3655 "Invalid constant pool index %u in Signature attribute in class file %s", 3656 signature_index, CHECK); 3657 set_class_generic_signature_index(signature_index); 3658 } 3659 3660 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3661 ConstantPool* cp, 3662 u4 attribute_byte_length, 3663 TRAPS) { 3664 assert(cfs != NULL, "invariant"); 3665 assert(cp != NULL, "invariant"); 3666 3667 const u1* const current_start = cfs->current(); 3668 3669 guarantee_property(attribute_byte_length >= sizeof(u2), 3670 "Invalid BootstrapMethods attribute length %u in class file %s", 3671 attribute_byte_length, 3672 CHECK); 3673 3674 cfs->guarantee_more(attribute_byte_length, CHECK); 3675 3676 const int attribute_array_length = cfs->get_u2_fast(); 3677 3678 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3679 "Short length on BootstrapMethods in class file %s", 3680 CHECK); 3681 3682 3683 // The attribute contains a counted array of counted tuples of shorts, 3684 // represending bootstrap specifiers: 3685 // length*{bootstrap_method_index, argument_count*{argument_index}} 3686 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3687 // operand_count = number of shorts in attr, except for leading length 3688 3689 // The attribute is copied into a short[] array. 3690 // The array begins with a series of short[2] pairs, one for each tuple. 3691 const int index_size = (attribute_array_length * 2); 3692 3693 Array<u2>* const operands = 3694 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3695 3696 // Eagerly assign operands so they will be deallocated with the constant 3697 // pool if there is an error. 3698 cp->set_operands(operands); 3699 3700 int operand_fill_index = index_size; 3701 const int cp_size = cp->length(); 3702 3703 for (int n = 0; n < attribute_array_length; n++) { 3704 // Store a 32-bit offset into the header of the operand array. 3705 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3706 3707 // Read a bootstrap specifier. 3708 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3709 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3710 const u2 argument_count = cfs->get_u2_fast(); 3711 check_property( 3712 valid_cp_range(bootstrap_method_index, cp_size) && 3713 cp->tag_at(bootstrap_method_index).is_method_handle(), 3714 "bootstrap_method_index %u has bad constant type in class file %s", 3715 bootstrap_method_index, 3716 CHECK); 3717 3718 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3719 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3720 CHECK); 3721 3722 operands->at_put(operand_fill_index++, bootstrap_method_index); 3723 operands->at_put(operand_fill_index++, argument_count); 3724 3725 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3726 for (int j = 0; j < argument_count; j++) { 3727 const u2 argument_index = cfs->get_u2_fast(); 3728 check_property( 3729 valid_cp_range(argument_index, cp_size) && 3730 cp->tag_at(argument_index).is_loadable_constant(), 3731 "argument_index %u has bad constant type in class file %s", 3732 argument_index, 3733 CHECK); 3734 operands->at_put(operand_fill_index++, argument_index); 3735 } 3736 } 3737 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3738 "Bad length on BootstrapMethods in class file %s", 3739 CHECK); 3740 } 3741 3742 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3743 ConstantPool* cp, 3744 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3745 TRAPS) { 3746 assert(cfs != NULL, "invariant"); 3747 assert(cp != NULL, "invariant"); 3748 assert(parsed_annotations != NULL, "invariant"); 3749 3750 // Set inner classes attribute to default sentinel 3751 _inner_classes = Universe::the_empty_short_array(); 3752 // Set nest members attribute to default sentinel 3753 _nest_members = Universe::the_empty_short_array(); 3754 // Set _permitted_subclasses attribute to default sentinel 3755 _permitted_subclasses = Universe::the_empty_short_array(); 3756 // Set _preload_classes attribute to default sentinel 3757 _preload_classes = Universe::the_empty_short_array(); 3758 cfs->guarantee_more(2, CHECK); // attributes_count 3759 u2 attributes_count = cfs->get_u2_fast(); 3760 bool parsed_sourcefile_attribute = false; 3761 bool parsed_innerclasses_attribute = false; 3762 bool parsed_nest_members_attribute = false; 3763 bool parsed_permitted_subclasses_attribute = false; 3764 bool parsed_preload_attribute = false; 3765 bool parsed_nest_host_attribute = false; 3766 bool parsed_record_attribute = false; 3767 bool parsed_enclosingmethod_attribute = false; 3768 bool parsed_bootstrap_methods_attribute = false; 3769 const u1* runtime_visible_annotations = NULL; 3770 int runtime_visible_annotations_length = 0; 3771 const u1* runtime_invisible_annotations = NULL; 3772 int runtime_invisible_annotations_length = 0; 3773 const u1* runtime_visible_type_annotations = NULL; 3774 int runtime_visible_type_annotations_length = 0; 3775 const u1* runtime_invisible_type_annotations = NULL; 3776 int runtime_invisible_type_annotations_length = 0; 3777 bool runtime_invisible_type_annotations_exists = false; 3778 bool runtime_invisible_annotations_exists = false; 3779 bool parsed_source_debug_ext_annotations_exist = false; 3780 const u1* inner_classes_attribute_start = NULL; 3781 u4 inner_classes_attribute_length = 0; 3782 u2 enclosing_method_class_index = 0; 3783 u2 enclosing_method_method_index = 0; 3784 const u1* nest_members_attribute_start = NULL; 3785 u4 nest_members_attribute_length = 0; 3786 const u1* record_attribute_start = NULL; 3787 u4 record_attribute_length = 0; 3788 const u1* permitted_subclasses_attribute_start = NULL; 3789 u4 permitted_subclasses_attribute_length = 0; 3790 const u1* preload_attribute_start = NULL; 3791 u4 preload_attribute_length = 0; 3792 3793 // Iterate over attributes 3794 while (attributes_count--) { 3795 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3796 const u2 attribute_name_index = cfs->get_u2_fast(); 3797 const u4 attribute_length = cfs->get_u4_fast(); 3798 check_property( 3799 valid_symbol_at(attribute_name_index), 3800 "Attribute name has bad constant pool index %u in class file %s", 3801 attribute_name_index, CHECK); 3802 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3803 if (tag == vmSymbols::tag_source_file()) { 3804 // Check for SourceFile tag 3805 if (_need_verify) { 3806 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3807 } 3808 if (parsed_sourcefile_attribute) { 3809 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD); 3810 return; 3811 } else { 3812 parsed_sourcefile_attribute = true; 3813 } 3814 parse_classfile_sourcefile_attribute(cfs, CHECK); 3815 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3816 // Check for SourceDebugExtension tag 3817 if (parsed_source_debug_ext_annotations_exist) { 3818 classfile_parse_error( 3819 "Multiple SourceDebugExtension attributes in class file %s", THREAD); 3820 return; 3821 } 3822 parsed_source_debug_ext_annotations_exist = true; 3823 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3824 } else if (tag == vmSymbols::tag_inner_classes()) { 3825 // Check for InnerClasses tag 3826 if (parsed_innerclasses_attribute) { 3827 classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD); 3828 return; 3829 } else { 3830 parsed_innerclasses_attribute = true; 3831 } 3832 inner_classes_attribute_start = cfs->current(); 3833 inner_classes_attribute_length = attribute_length; 3834 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3835 } else if (tag == vmSymbols::tag_synthetic()) { 3836 // Check for Synthetic tag 3837 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3838 if (attribute_length != 0) { 3839 classfile_parse_error( 3840 "Invalid Synthetic classfile attribute length %u in class file %s", 3841 attribute_length, THREAD); 3842 return; 3843 } 3844 parse_classfile_synthetic_attribute(); 3845 } else if (tag == vmSymbols::tag_deprecated()) { 3846 // Check for Deprecated tag - 4276120 3847 if (attribute_length != 0) { 3848 classfile_parse_error( 3849 "Invalid Deprecated classfile attribute length %u in class file %s", 3850 attribute_length, THREAD); 3851 return; 3852 } 3853 } else if (_major_version >= JAVA_1_5_VERSION) { 3854 if (tag == vmSymbols::tag_signature()) { 3855 if (_generic_signature_index != 0) { 3856 classfile_parse_error( 3857 "Multiple Signature attributes in class file %s", THREAD); 3858 return; 3859 } 3860 if (attribute_length != 2) { 3861 classfile_parse_error( 3862 "Wrong Signature attribute length %u in class file %s", 3863 attribute_length, THREAD); 3864 return; 3865 } 3866 parse_classfile_signature_attribute(cfs, CHECK); 3867 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3868 if (runtime_visible_annotations != NULL) { 3869 classfile_parse_error( 3870 "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD); 3871 return; 3872 } 3873 runtime_visible_annotations_length = attribute_length; 3874 runtime_visible_annotations = cfs->current(); 3875 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3876 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3877 parse_annotations(cp, 3878 runtime_visible_annotations, 3879 runtime_visible_annotations_length, 3880 parsed_annotations, 3881 _loader_data, 3882 _can_access_vm_annotations); 3883 cfs->skip_u1_fast(runtime_visible_annotations_length); 3884 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3885 if (runtime_invisible_annotations_exists) { 3886 classfile_parse_error( 3887 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD); 3888 return; 3889 } 3890 runtime_invisible_annotations_exists = true; 3891 if (PreserveAllAnnotations) { 3892 runtime_invisible_annotations_length = attribute_length; 3893 runtime_invisible_annotations = cfs->current(); 3894 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3895 } 3896 cfs->skip_u1(attribute_length, CHECK); 3897 } else if (tag == vmSymbols::tag_enclosing_method()) { 3898 if (parsed_enclosingmethod_attribute) { 3899 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD); 3900 return; 3901 } else { 3902 parsed_enclosingmethod_attribute = true; 3903 } 3904 guarantee_property(attribute_length == 4, 3905 "Wrong EnclosingMethod attribute length %u in class file %s", 3906 attribute_length, CHECK); 3907 cfs->guarantee_more(4, CHECK); // class_index, method_index 3908 enclosing_method_class_index = cfs->get_u2_fast(); 3909 enclosing_method_method_index = cfs->get_u2_fast(); 3910 if (enclosing_method_class_index == 0) { 3911 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD); 3912 return; 3913 } 3914 // Validate the constant pool indices and types 3915 check_property(valid_klass_reference_at(enclosing_method_class_index), 3916 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3917 if (enclosing_method_method_index != 0 && 3918 (!cp->is_within_bounds(enclosing_method_method_index) || 3919 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3920 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD); 3921 return; 3922 } 3923 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3924 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3925 if (parsed_bootstrap_methods_attribute) { 3926 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD); 3927 return; 3928 } 3929 parsed_bootstrap_methods_attribute = true; 3930 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3931 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3932 if (runtime_visible_type_annotations != NULL) { 3933 classfile_parse_error( 3934 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD); 3935 return; 3936 } 3937 runtime_visible_type_annotations_length = attribute_length; 3938 runtime_visible_type_annotations = cfs->current(); 3939 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3940 // No need for the VM to parse Type annotations 3941 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3942 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3943 if (runtime_invisible_type_annotations_exists) { 3944 classfile_parse_error( 3945 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD); 3946 return; 3947 } else { 3948 runtime_invisible_type_annotations_exists = true; 3949 } 3950 if (PreserveAllAnnotations) { 3951 runtime_invisible_type_annotations_length = attribute_length; 3952 runtime_invisible_type_annotations = cfs->current(); 3953 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3954 } 3955 cfs->skip_u1(attribute_length, CHECK); 3956 } else if (_major_version >= JAVA_11_VERSION) { 3957 if (tag == vmSymbols::tag_nest_members()) { 3958 // Check for NestMembers tag 3959 if (parsed_nest_members_attribute) { 3960 classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD); 3961 return; 3962 } else { 3963 parsed_nest_members_attribute = true; 3964 } 3965 if (parsed_nest_host_attribute) { 3966 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD); 3967 return; 3968 } 3969 nest_members_attribute_start = cfs->current(); 3970 nest_members_attribute_length = attribute_length; 3971 cfs->skip_u1(nest_members_attribute_length, CHECK); 3972 } else if (tag == vmSymbols::tag_nest_host()) { 3973 if (parsed_nest_host_attribute) { 3974 classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD); 3975 return; 3976 } else { 3977 parsed_nest_host_attribute = true; 3978 } 3979 if (parsed_nest_members_attribute) { 3980 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD); 3981 return; 3982 } 3983 if (_need_verify) { 3984 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3985 } 3986 cfs->guarantee_more(2, CHECK); 3987 u2 class_info_index = cfs->get_u2_fast(); 3988 check_property( 3989 valid_klass_reference_at(class_info_index), 3990 "Nest-host class_info_index %u has bad constant type in class file %s", 3991 class_info_index, CHECK); 3992 _nest_host = class_info_index; 3993 3994 } else if (_major_version >= JAVA_16_VERSION) { 3995 if (tag == vmSymbols::tag_record()) { 3996 if (parsed_record_attribute) { 3997 classfile_parse_error("Multiple Record attributes in class file %s", THREAD); 3998 return; 3999 } 4000 parsed_record_attribute = true; 4001 record_attribute_start = cfs->current(); 4002 record_attribute_length = attribute_length; 4003 } else if (_major_version >= JAVA_17_VERSION) { 4004 if (tag == vmSymbols::tag_permitted_subclasses()) { 4005 if (parsed_permitted_subclasses_attribute) { 4006 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK); 4007 return; 4008 } 4009 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute. 4010 if (_access_flags.is_final()) { 4011 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK); 4012 return; 4013 } 4014 parsed_permitted_subclasses_attribute = true; 4015 permitted_subclasses_attribute_start = cfs->current(); 4016 permitted_subclasses_attribute_length = attribute_length; 4017 } 4018 if (EnableValhalla && tag == vmSymbols::tag_preload()) { 4019 if (parsed_preload_attribute) { 4020 classfile_parse_error("Multiple Preload attributes in class file %s", CHECK); 4021 return; 4022 } 4023 parsed_preload_attribute = true; 4024 preload_attribute_start = cfs->current(); 4025 preload_attribute_length = attribute_length; 4026 } 4027 } 4028 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION 4029 cfs->skip_u1(attribute_length, CHECK); 4030 } else { 4031 // Unknown attribute 4032 cfs->skip_u1(attribute_length, CHECK); 4033 } 4034 } else { 4035 // Unknown attribute 4036 cfs->skip_u1(attribute_length, CHECK); 4037 } 4038 } else { 4039 // Unknown attribute 4040 cfs->skip_u1(attribute_length, CHECK); 4041 } 4042 } 4043 _class_annotations = assemble_annotations(runtime_visible_annotations, 4044 runtime_visible_annotations_length, 4045 runtime_invisible_annotations, 4046 runtime_invisible_annotations_length, 4047 CHECK); 4048 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations, 4049 runtime_visible_type_annotations_length, 4050 runtime_invisible_type_annotations, 4051 runtime_invisible_type_annotations_length, 4052 CHECK); 4053 4054 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 4055 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 4056 cfs, 4057 cp, 4058 inner_classes_attribute_start, 4059 parsed_innerclasses_attribute, 4060 enclosing_method_class_index, 4061 enclosing_method_method_index, 4062 CHECK); 4063 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 4064 guarantee_property( 4065 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 4066 "Wrong InnerClasses attribute length in class file %s", CHECK); 4067 } 4068 } 4069 4070 if (parsed_nest_members_attribute) { 4071 const u2 num_of_classes = parse_classfile_nest_members_attribute( 4072 cfs, 4073 nest_members_attribute_start, 4074 CHECK); 4075 if (_need_verify) { 4076 guarantee_property( 4077 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 4078 "Wrong NestMembers attribute length in class file %s", CHECK); 4079 } 4080 } 4081 4082 if (parsed_record_attribute) { 4083 const unsigned int calculated_attr_length = parse_classfile_record_attribute( 4084 cfs, 4085 cp, 4086 record_attribute_start, 4087 CHECK); 4088 if (_need_verify) { 4089 guarantee_property(record_attribute_length == calculated_attr_length, 4090 "Record attribute has wrong length in class file %s", 4091 CHECK); 4092 } 4093 } 4094 4095 if (parsed_permitted_subclasses_attribute) { 4096 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute( 4097 cfs, 4098 permitted_subclasses_attribute_start, 4099 CHECK); 4100 if (_need_verify) { 4101 guarantee_property( 4102 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses, 4103 "Wrong PermittedSubclasses attribute length in class file %s", CHECK); 4104 } 4105 } 4106 4107 if (parsed_preload_attribute) { 4108 const u2 num_classes = parse_classfile_preload_attribute( 4109 cfs, 4110 preload_attribute_start, 4111 CHECK); 4112 if (_need_verify) { 4113 guarantee_property( 4114 preload_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes, 4115 "Wrong Preload attribute length in class file %s", CHECK); 4116 } 4117 } 4118 4119 if (_max_bootstrap_specifier_index >= 0) { 4120 guarantee_property(parsed_bootstrap_methods_attribute, 4121 "Missing BootstrapMethods attribute in class file %s", CHECK); 4122 } 4123 } 4124 4125 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 4126 assert(k != NULL, "invariant"); 4127 4128 if (_synthetic_flag) 4129 k->set_is_synthetic(); 4130 if (_sourcefile_index != 0) { 4131 k->set_source_file_name_index(_sourcefile_index); 4132 } 4133 if (_generic_signature_index != 0) { 4134 k->set_generic_signature_index(_generic_signature_index); 4135 } 4136 if (_sde_buffer != NULL) { 4137 k->set_source_debug_extension(_sde_buffer, _sde_length); 4138 } 4139 } 4140 4141 // Create the Annotations object that will 4142 // hold the annotations array for the Klass. 4143 void ClassFileParser::create_combined_annotations(TRAPS) { 4144 if (_class_annotations == NULL && 4145 _class_type_annotations == NULL && 4146 _fields_annotations == NULL && 4147 _fields_type_annotations == NULL) { 4148 // Don't create the Annotations object unnecessarily. 4149 return; 4150 } 4151 4152 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 4153 annotations->set_class_annotations(_class_annotations); 4154 annotations->set_class_type_annotations(_class_type_annotations); 4155 annotations->set_fields_annotations(_fields_annotations); 4156 annotations->set_fields_type_annotations(_fields_type_annotations); 4157 4158 // This is the Annotations object that will be 4159 // assigned to InstanceKlass being constructed. 4160 _combined_annotations = annotations; 4161 4162 // The annotations arrays below has been transfered the 4163 // _combined_annotations so these fields can now be cleared. 4164 _class_annotations = NULL; 4165 _class_type_annotations = NULL; 4166 _fields_annotations = NULL; 4167 _fields_type_annotations = NULL; 4168 } 4169 4170 // Transfer ownership of metadata allocated to the InstanceKlass. 4171 void ClassFileParser::apply_parsed_class_metadata( 4172 InstanceKlass* this_klass, 4173 int java_fields_count) { 4174 assert(this_klass != NULL, "invariant"); 4175 4176 _cp->set_pool_holder(this_klass); 4177 this_klass->set_constants(_cp); 4178 this_klass->set_fields(_fields, java_fields_count); 4179 this_klass->set_methods(_methods); 4180 this_klass->set_inner_classes(_inner_classes); 4181 this_klass->set_nest_members(_nest_members); 4182 this_klass->set_nest_host_index(_nest_host); 4183 this_klass->set_preload_classes(_preload_classes); 4184 this_klass->set_annotations(_combined_annotations); 4185 this_klass->set_permitted_subclasses(_permitted_subclasses); 4186 this_klass->set_record_components(_record_components); 4187 // Delay the setting of _local_interfaces and _transitive_interfaces until after 4188 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could 4189 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with 4190 // its _super. If an OOM occurs while loading the current klass, its _super field 4191 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 4192 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 4193 // dereferences to the deallocated _transitive_interfaces will result in a crash. 4194 4195 // Clear out these fields so they don't get deallocated by the destructor 4196 clear_class_metadata(); 4197 } 4198 4199 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 4200 int runtime_visible_annotations_length, 4201 const u1* const runtime_invisible_annotations, 4202 int runtime_invisible_annotations_length, 4203 TRAPS) { 4204 AnnotationArray* annotations = NULL; 4205 if (runtime_visible_annotations != NULL || 4206 runtime_invisible_annotations != NULL) { 4207 annotations = MetadataFactory::new_array<u1>(_loader_data, 4208 runtime_visible_annotations_length + 4209 runtime_invisible_annotations_length, 4210 CHECK_(annotations)); 4211 if (runtime_visible_annotations != NULL) { 4212 for (int i = 0; i < runtime_visible_annotations_length; i++) { 4213 annotations->at_put(i, runtime_visible_annotations[i]); 4214 } 4215 } 4216 if (runtime_invisible_annotations != NULL) { 4217 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 4218 int append = runtime_visible_annotations_length+i; 4219 annotations->at_put(append, runtime_invisible_annotations[i]); 4220 } 4221 } 4222 } 4223 return annotations; 4224 } 4225 4226 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 4227 const int super_class_index, 4228 const bool need_verify, 4229 TRAPS) { 4230 assert(cp != NULL, "invariant"); 4231 const InstanceKlass* super_klass = NULL; 4232 4233 if (super_class_index == 0) { 4234 check_property(_class_name == vmSymbols::java_lang_Object(), 4235 "Invalid superclass index 0 in class file %s", 4236 CHECK_NULL); 4237 } else { 4238 check_property(valid_klass_reference_at(super_class_index), 4239 "Invalid superclass index %u in class file %s", 4240 super_class_index, 4241 CHECK_NULL); 4242 // The class name should be legal because it is checked when parsing constant pool. 4243 // However, make sure it is not an array type. 4244 bool is_array = false; 4245 if (cp->tag_at(super_class_index).is_klass()) { 4246 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 4247 if (need_verify) 4248 is_array = super_klass->is_array_klass(); 4249 } else if (need_verify) { 4250 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY); 4251 } 4252 if (need_verify) { 4253 guarantee_property(!is_array, 4254 "Bad superclass name in class file %s", CHECK_NULL); 4255 } 4256 } 4257 return super_klass; 4258 } 4259 4260 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) { 4261 _max_nonstatic_oop_maps = max_blocks; 4262 _nonstatic_oop_map_count = 0; 4263 if (max_blocks == 0) { 4264 _nonstatic_oop_maps = NULL; 4265 } else { 4266 _nonstatic_oop_maps = 4267 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps); 4268 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); 4269 } 4270 } 4271 4272 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const { 4273 assert(_nonstatic_oop_map_count > 0, "Has no oop maps"); 4274 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1); 4275 } 4276 4277 // addition of super oop maps 4278 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { 4279 assert(nof_blocks && _nonstatic_oop_map_count == 0 && 4280 nof_blocks <= _max_nonstatic_oop_maps, "invariant"); 4281 4282 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); 4283 _nonstatic_oop_map_count += nof_blocks; 4284 } 4285 4286 // collection of oops 4287 void OopMapBlocksBuilder::add(int offset, int count) { 4288 if (_nonstatic_oop_map_count == 0) { 4289 _nonstatic_oop_map_count++; 4290 } 4291 OopMapBlock* nonstatic_oop_map = last_oop_map(); 4292 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up 4293 nonstatic_oop_map->set_offset(offset); 4294 nonstatic_oop_map->set_count(count); 4295 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add 4296 nonstatic_oop_map->increment_count(count); 4297 } else { // Need a new one... 4298 _nonstatic_oop_map_count++; 4299 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check"); 4300 nonstatic_oop_map = last_oop_map(); 4301 nonstatic_oop_map->set_offset(offset); 4302 nonstatic_oop_map->set_count(count); 4303 } 4304 } 4305 4306 // general purpose copy, e.g. into allocated instanceKlass 4307 void OopMapBlocksBuilder::copy(OopMapBlock* dst) { 4308 if (_nonstatic_oop_map_count != 0) { 4309 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count); 4310 } 4311 } 4312 4313 // Sort and compact adjacent blocks 4314 void OopMapBlocksBuilder::compact() { 4315 if (_nonstatic_oop_map_count <= 1) { 4316 return; 4317 } 4318 /* 4319 * Since field layout sneeks in oops before values, we will be able to condense 4320 * blocks. There is potential to compact between super, own refs and values 4321 * containing refs. 4322 * 4323 * Currently compaction is slightly limited due to values being 8 byte aligned. 4324 * This may well change: FixMe if it doesn't, the code below is fairly general purpose 4325 * and maybe it doesn't need to be. 4326 */ 4327 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock), 4328 (_sort_Fn)OopMapBlock::compare_offset); 4329 if (_nonstatic_oop_map_count < 2) { 4330 return; 4331 } 4332 4333 // Make a temp copy, and iterate through and copy back into the original 4334 ResourceMark rm; 4335 OopMapBlock* oop_maps_copy = 4336 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count); 4337 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count; 4338 copy(oop_maps_copy); 4339 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps; 4340 unsigned int new_count = 1; 4341 oop_maps_copy++; 4342 while(oop_maps_copy < oop_maps_copy_end) { 4343 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); 4344 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { 4345 nonstatic_oop_map->increment_count(oop_maps_copy->count()); 4346 } else { 4347 nonstatic_oop_map++; 4348 new_count++; 4349 nonstatic_oop_map->set_offset(oop_maps_copy->offset()); 4350 nonstatic_oop_map->set_count(oop_maps_copy->count()); 4351 } 4352 oop_maps_copy++; 4353 } 4354 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?"); 4355 _nonstatic_oop_map_count = new_count; 4356 } 4357 4358 void OopMapBlocksBuilder::print_on(outputStream* st) const { 4359 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps); 4360 if (_nonstatic_oop_map_count > 0) { 4361 OopMapBlock* map = _nonstatic_oop_maps; 4362 OopMapBlock* last_map = last_oop_map(); 4363 assert(map <= last_map, "Last less than first"); 4364 while (map <= last_map) { 4365 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), 4366 map->offset() + map->offset_span() - heapOopSize, map->count()); 4367 map++; 4368 } 4369 } 4370 } 4371 4372 void OopMapBlocksBuilder::print_value_on(outputStream* st) const { 4373 print_on(st); 4374 } 4375 4376 void ClassFileParser::throwInlineTypeLimitation(THREAD_AND_LOCATION_DECL, 4377 const char* msg, 4378 const Symbol* name, 4379 const Symbol* sig) const { 4380 4381 ResourceMark rm(THREAD); 4382 if (name == NULL || sig == NULL) { 4383 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS, 4384 vmSymbols::java_lang_ClassFormatError(), 4385 "class: %s - %s", _class_name->as_C_string(), msg); 4386 } 4387 else { 4388 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS, 4389 vmSymbols::java_lang_ClassFormatError(), 4390 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(), 4391 _class_name->as_C_string(), msg); 4392 } 4393 } 4394 4395 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4396 assert(ik != NULL, "invariant"); 4397 4398 const Klass* const super = ik->super(); 4399 4400 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4401 // in which case we don't have to register objects as finalizable 4402 if (!_has_empty_finalizer) { 4403 if (_has_finalizer || 4404 (super != NULL && super->has_finalizer())) { 4405 ik->set_has_finalizer(); 4406 } 4407 } 4408 4409 #ifdef ASSERT 4410 bool f = false; 4411 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4412 vmSymbols::void_method_signature()); 4413 if (InstanceKlass::is_finalization_enabled() && 4414 (m != NULL) && !m->is_empty_method()) { 4415 f = true; 4416 } 4417 4418 // Spec doesn't prevent agent from redefinition of empty finalizer. 4419 // Despite the fact that it's generally bad idea and redefined finalizer 4420 // will not work as expected we shouldn't abort vm in this case 4421 if (!ik->has_redefined_this_or_super()) { 4422 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4423 } 4424 #endif 4425 4426 // Check if this klass supports the java.lang.Cloneable interface 4427 if (vmClasses::Cloneable_klass_loaded()) { 4428 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) { 4429 if (ik->is_inline_klass()) { 4430 JavaThread *THREAD = JavaThread::current(); 4431 throwInlineTypeLimitation(THREAD_AND_LOCATION, "Inline Types do not support Cloneable"); 4432 return; 4433 } 4434 ik->set_is_cloneable(); 4435 } 4436 } 4437 4438 // Check if this klass has a vanilla default constructor 4439 if (super == NULL) { 4440 // java.lang.Object has empty default constructor 4441 ik->set_has_vanilla_constructor(); 4442 } else { 4443 if (super->has_vanilla_constructor() && 4444 _has_vanilla_constructor) { 4445 ik->set_has_vanilla_constructor(); 4446 } 4447 #ifdef ASSERT 4448 bool v = false; 4449 if (super->has_vanilla_constructor()) { 4450 const Method* const constructor = 4451 ik->find_method(vmSymbols::object_initializer_name(), 4452 vmSymbols::void_method_signature()); 4453 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4454 v = true; 4455 } 4456 } 4457 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4458 #endif 4459 } 4460 4461 // If it cannot be fast-path allocated, set a bit in the layout helper. 4462 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4463 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4464 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4465 || ik->is_abstract() || ik->is_interface() 4466 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4467 || ik->size_helper() >= FastAllocateSizeLimit) { 4468 // Forbid fast-path allocation. 4469 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4470 ik->set_layout_helper(lh); 4471 } 4472 } 4473 4474 bool ClassFileParser::supports_inline_types() const { 4475 // Inline types are only supported by class file version 55 and later 4476 return _major_version >= JAVA_11_VERSION; 4477 } 4478 4479 // utility methods for appending an array with check for duplicates 4480 4481 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4482 const Array<InstanceKlass*>* const ifs) { 4483 // iterate over new interfaces 4484 for (int i = 0; i < ifs->length(); i++) { 4485 InstanceKlass* const e = ifs->at(i); 4486 assert(e->is_klass() && e->is_interface(), "just checking"); 4487 // add new interface 4488 result->append_if_missing(e); 4489 } 4490 } 4491 4492 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4493 Array<InstanceKlass*>* local_ifs, 4494 ClassLoaderData* loader_data, 4495 TRAPS) { 4496 assert(local_ifs != NULL, "invariant"); 4497 assert(loader_data != NULL, "invariant"); 4498 4499 // Compute maximum size for transitive interfaces 4500 int max_transitive_size = 0; 4501 int super_size = 0; 4502 // Add superclass transitive interfaces size 4503 if (super != NULL) { 4504 super_size = super->transitive_interfaces()->length(); 4505 max_transitive_size += super_size; 4506 } 4507 // Add local interfaces' super interfaces 4508 const int local_size = local_ifs->length(); 4509 for (int i = 0; i < local_size; i++) { 4510 InstanceKlass* const l = local_ifs->at(i); 4511 max_transitive_size += l->transitive_interfaces()->length(); 4512 } 4513 // Finally add local interfaces 4514 max_transitive_size += local_size; 4515 // Construct array 4516 if (max_transitive_size == 0) { 4517 // no interfaces, use canonicalized array 4518 return Universe::the_empty_instance_klass_array(); 4519 } else if (max_transitive_size == super_size) { 4520 // no new local interfaces added, share superklass' transitive interface array 4521 return super->transitive_interfaces(); 4522 // The three lines below are commented to work around bug JDK-8245487 4523 // } else if (max_transitive_size == local_size) { 4524 // // only local interfaces added, share local interface array 4525 // return local_ifs; 4526 } else { 4527 ResourceMark rm; 4528 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4529 4530 // Copy down from superclass 4531 if (super != NULL) { 4532 append_interfaces(result, super->transitive_interfaces()); 4533 } 4534 4535 // Copy down from local interfaces' superinterfaces 4536 for (int i = 0; i < local_size; i++) { 4537 InstanceKlass* const l = local_ifs->at(i); 4538 append_interfaces(result, l->transitive_interfaces()); 4539 } 4540 // Finally add local interfaces 4541 append_interfaces(result, local_ifs); 4542 4543 // length will be less than the max_transitive_size if duplicates were removed 4544 const int length = result->length(); 4545 assert(length <= max_transitive_size, "just checking"); 4546 4547 Array<InstanceKlass*>* const new_result = 4548 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4549 for (int i = 0; i < length; i++) { 4550 InstanceKlass* const e = result->at(i); 4551 assert(e != NULL, "just checking"); 4552 new_result->at_put(i, e); 4553 } 4554 return new_result; 4555 } 4556 } 4557 4558 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4559 assert(this_klass != NULL, "invariant"); 4560 const Klass* const super = this_klass->super(); 4561 4562 if (super != NULL) { 4563 const InstanceKlass* super_ik = InstanceKlass::cast(super); 4564 4565 if (super->is_final()) { 4566 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD); 4567 return; 4568 } 4569 4570 if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) { 4571 classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD); 4572 return; 4573 } 4574 4575 // The JVMS says that super classes for value types must have the ACC_PERMITS_VALUE 4576 // flag set. However, since java.lang.Object has not yet been changed into an abstract 4577 // class, it cannot have its ACC_PERMITS_VALUE flag set. But, java.lang.Object must 4578 // still be allowed to be a direct super class for a value classes. So, it is treated 4579 // as a special case for now. 4580 if (this_klass->access_flags().is_value_class() && 4581 super_ik->name() != vmSymbols::java_lang_Object() && 4582 super_ik->is_identity_class()) { 4583 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD); 4584 return; 4585 } 4586 4587 // If the loader is not the boot loader then throw an exception if its 4588 // superclass is in package jdk.internal.reflect and its loader is not a 4589 // special reflection class loader 4590 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4591 PackageEntry* super_package = super->package(); 4592 if (super_package != NULL && 4593 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4594 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4595 ResourceMark rm(THREAD); 4596 Exceptions::fthrow( 4597 THREAD_AND_LOCATION, 4598 vmSymbols::java_lang_IllegalAccessError(), 4599 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4600 this_klass->external_name(), 4601 this_klass->class_loader_data()->loader_name_and_id(), 4602 super->external_name()); 4603 return; 4604 } 4605 } 4606 4607 Reflection::VerifyClassAccessResults vca_result = 4608 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4609 if (vca_result != Reflection::ACCESS_OK) { 4610 ResourceMark rm(THREAD); 4611 char* msg = Reflection::verify_class_access_msg(this_klass, 4612 InstanceKlass::cast(super), 4613 vca_result); 4614 if (msg == NULL) { 4615 bool same_module = (this_klass->module() == super->module()); 4616 Exceptions::fthrow( 4617 THREAD_AND_LOCATION, 4618 vmSymbols::java_lang_IllegalAccessError(), 4619 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4620 this_klass->external_name(), 4621 super->is_abstract() ? "abstract " : "", 4622 super->external_name(), 4623 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4624 (same_module) ? "" : "; ", 4625 (same_module) ? "" : super->class_in_module_of_loader()); 4626 } else { 4627 // Add additional message content. 4628 Exceptions::fthrow( 4629 THREAD_AND_LOCATION, 4630 vmSymbols::java_lang_IllegalAccessError(), 4631 "superclass access check failed: %s", 4632 msg); 4633 } 4634 } 4635 } 4636 } 4637 4638 4639 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4640 assert(this_klass != NULL, "invariant"); 4641 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4642 const int lng = local_interfaces->length(); 4643 for (int i = lng - 1; i >= 0; i--) { 4644 InstanceKlass* const k = local_interfaces->at(i); 4645 assert (k != NULL && k->is_interface(), "invalid interface"); 4646 4647 if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) { 4648 classfile_icce_error(this_klass->is_interface() ? 4649 "class %s cannot extend sealed interface %s" : 4650 "class %s cannot implement sealed interface %s", 4651 k, THREAD); 4652 return; 4653 } 4654 4655 Reflection::VerifyClassAccessResults vca_result = 4656 Reflection::verify_class_access(this_klass, k, false); 4657 if (vca_result != Reflection::ACCESS_OK) { 4658 ResourceMark rm(THREAD); 4659 char* msg = Reflection::verify_class_access_msg(this_klass, 4660 k, 4661 vca_result); 4662 if (msg == NULL) { 4663 bool same_module = (this_klass->module() == k->module()); 4664 Exceptions::fthrow( 4665 THREAD_AND_LOCATION, 4666 vmSymbols::java_lang_IllegalAccessError(), 4667 "class %s cannot access its superinterface %s (%s%s%s)", 4668 this_klass->external_name(), 4669 k->external_name(), 4670 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4671 (same_module) ? "" : "; ", 4672 (same_module) ? "" : k->class_in_module_of_loader()); 4673 } else { 4674 // Add additional message content. 4675 Exceptions::fthrow( 4676 THREAD_AND_LOCATION, 4677 vmSymbols::java_lang_IllegalAccessError(), 4678 "superinterface check failed: %s", 4679 msg); 4680 } 4681 } 4682 } 4683 } 4684 4685 4686 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4687 assert(this_klass != NULL, "invariant"); 4688 const Array<Method*>* const methods = this_klass->methods(); 4689 const int num_methods = methods->length(); 4690 4691 // go thru each method and check if it overrides a final method 4692 for (int index = 0; index < num_methods; index++) { 4693 const Method* const m = methods->at(index); 4694 4695 // skip private, static, and <init> methods 4696 if ((!m->is_private() && !m->is_static()) && 4697 (m->name() != vmSymbols::object_initializer_name())) { 4698 4699 const Symbol* const name = m->name(); 4700 const Symbol* const signature = m->signature(); 4701 const Klass* k = this_klass->super(); 4702 const Method* super_m = NULL; 4703 while (k != NULL) { 4704 // skip supers that don't have final methods. 4705 if (k->has_final_method()) { 4706 // lookup a matching method in the super class hierarchy 4707 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4708 if (super_m == NULL) { 4709 break; // didn't find any match; get out 4710 } 4711 4712 if (super_m->is_final() && !super_m->is_static() && 4713 !super_m->access_flags().is_private()) { 4714 // matching method in super is final, and not static or private 4715 bool can_access = Reflection::verify_member_access(this_klass, 4716 super_m->method_holder(), 4717 super_m->method_holder(), 4718 super_m->access_flags(), 4719 false, false, CHECK); 4720 if (can_access) { 4721 // this class can access super final method and therefore override 4722 ResourceMark rm(THREAD); 4723 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 4724 err_msg("class %s overrides final method %s.%s%s", 4725 this_klass->external_name(), 4726 super_m->method_holder()->external_name(), 4727 name->as_C_string(), 4728 signature->as_C_string())); 4729 } 4730 } 4731 4732 // continue to look from super_m's holder's super. 4733 k = super_m->method_holder()->super(); 4734 continue; 4735 } 4736 4737 k = k->super(); 4738 } 4739 } 4740 } 4741 } 4742 4743 4744 // assumes that this_klass is an interface 4745 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4746 assert(this_klass != NULL, "invariant"); 4747 assert(this_klass->is_interface(), "not an interface"); 4748 const Array<Method*>* methods = this_klass->methods(); 4749 const int num_methods = methods->length(); 4750 4751 for (int index = 0; index < num_methods; index++) { 4752 const Method* const m = methods->at(index); 4753 // if m is static and not the init method, throw a verify error 4754 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4755 ResourceMark rm(THREAD); 4756 Exceptions::fthrow( 4757 THREAD_AND_LOCATION, 4758 vmSymbols::java_lang_VerifyError(), 4759 "Illegal static method %s in interface %s", 4760 m->name()->as_C_string(), 4761 this_klass->external_name() 4762 ); 4763 return; 4764 } 4765 } 4766 } 4767 4768 // utility methods for format checking 4769 4770 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4771 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4772 const bool is_value_class = (flags & JVM_ACC_VALUE) != 0; 4773 const bool is_primitive_class = (flags & JVM_ACC_PRIMITIVE) != 0; 4774 const bool is_permits_value_class = (flags & JVM_ACC_PERMITS_VALUE) != 0; 4775 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4776 assert(supports_inline_types() || !is_value_class, "JVM_ACC_VALUE should not be set"); 4777 assert(supports_inline_types() || !is_primitive_class, "JVM_ACC_PRIMITIVE should not be set"); 4778 assert(supports_inline_types() || !is_permits_value_class, "JVM_ACC_PERMITS_VALUE should not be set"); 4779 if (is_module) { 4780 ResourceMark rm(THREAD); 4781 Exceptions::fthrow( 4782 THREAD_AND_LOCATION, 4783 vmSymbols::java_lang_NoClassDefFoundError(), 4784 "%s is not a class because access_flag ACC_MODULE is set", 4785 _class_name->as_C_string()); 4786 return; 4787 } 4788 4789 if (!EnableValhalla) { 4790 if (is_value_class || is_primitive_class) { 4791 const char* bad_flag = is_primitive_class ? "ACC_PRIMITIVE" : "ACC_VALUE"; 4792 ResourceMark rm(THREAD); 4793 Exceptions::fthrow( 4794 THREAD_AND_LOCATION, 4795 vmSymbols::java_lang_ClassFormatError(), 4796 "Class modifier %s in class %s requires option -XX:+EnableValhalla", 4797 bad_flag, _class_name->as_C_string() 4798 ); 4799 } 4800 return; 4801 } 4802 4803 if (!_need_verify) { return; } 4804 4805 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4806 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4807 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4808 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4809 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4810 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4811 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4812 4813 if ((is_abstract && is_final) || 4814 (is_interface && !is_abstract) || 4815 (is_interface && major_gte_1_5 && (is_super || is_enum)) || 4816 (!is_interface && major_gte_1_5 && is_annotation) || 4817 (is_value_class && (is_enum || is_permits_value_class)) || 4818 (is_permits_value_class && (is_interface || is_final || !is_abstract)) || 4819 (is_primitive_class && (!is_value_class || !is_final || is_interface || is_abstract))) { 4820 ResourceMark rm(THREAD); 4821 const char* class_note = ""; 4822 if (is_value_class) class_note = " (a value class)"; 4823 if (is_primitive_class) class_note = " (a primitive class)"; 4824 if (is_permits_value_class) class_note = " (a permits_value class)"; 4825 Exceptions::fthrow( 4826 THREAD_AND_LOCATION, 4827 vmSymbols::java_lang_ClassFormatError(), 4828 "Illegal class modifiers in class %s%s: 0x%X", 4829 _class_name->as_C_string(), class_note, flags 4830 ); 4831 return; 4832 } 4833 } 4834 4835 static bool has_illegal_visibility(jint flags) { 4836 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4837 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4838 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4839 4840 return ((is_public && is_protected) || 4841 (is_public && is_private) || 4842 (is_protected && is_private)); 4843 } 4844 4845 // A legal major_version.minor_version must be one of the following: 4846 // 4847 // Major_version >= 45 and major_version < 56, any minor_version. 4848 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. 4849 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. 4850 // 4851 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4852 ResourceMark rm(THREAD); 4853 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4854 if (major < JAVA_MIN_SUPPORTED_VERSION) { 4855 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version", 4856 class_name, major, minor, THREAD); 4857 return; 4858 } 4859 4860 if (major > max_version) { 4861 Exceptions::fthrow( 4862 THREAD_AND_LOCATION, 4863 vmSymbols::java_lang_UnsupportedClassVersionError(), 4864 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4865 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4866 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4867 return; 4868 } 4869 4870 if (major < JAVA_12_VERSION || minor == 0) { 4871 return; 4872 } 4873 4874 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4875 if (major != max_version) { 4876 Exceptions::fthrow( 4877 THREAD_AND_LOCATION, 4878 vmSymbols::java_lang_UnsupportedClassVersionError(), 4879 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4880 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4881 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4882 return; 4883 } 4884 4885 if (!Arguments::enable_preview()) { 4886 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4887 class_name, major, minor, THREAD); 4888 return; 4889 } 4890 4891 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4892 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4893 class_name, major, minor, THREAD); 4894 } 4895 } 4896 4897 void ClassFileParser::verify_legal_field_modifiers(jint flags, 4898 bool is_interface, 4899 bool is_inline_type, 4900 bool is_permits_value_class, 4901 TRAPS) const { 4902 if (!_need_verify) { return; } 4903 4904 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4905 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4906 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4907 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4908 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4909 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4910 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4911 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4912 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4913 4914 bool is_illegal = false; 4915 4916 if (is_interface) { 4917 if (!is_public || !is_static || !is_final || is_private || 4918 is_protected || is_volatile || is_transient || 4919 (major_gte_1_5 && is_enum)) { 4920 is_illegal = true; 4921 } 4922 } else { // not interface 4923 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4924 is_illegal = true; 4925 } else { 4926 if (is_inline_type && !is_static && !is_final) { 4927 is_illegal = true; 4928 } else if (is_permits_value_class && !is_static) { 4929 is_illegal = true; 4930 } 4931 } 4932 } 4933 4934 if (is_illegal) { 4935 ResourceMark rm(THREAD); 4936 Exceptions::fthrow( 4937 THREAD_AND_LOCATION, 4938 vmSymbols::java_lang_ClassFormatError(), 4939 "Illegal field modifiers in class %s: 0x%X", 4940 _class_name->as_C_string(), flags); 4941 return; 4942 } 4943 } 4944 4945 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4946 bool is_interface, 4947 bool is_inline_type, 4948 bool is_abstract_type, 4949 const Symbol* name, 4950 TRAPS) const { 4951 if (!_need_verify) { return; } 4952 4953 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4954 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4955 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4956 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4957 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4958 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4959 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4960 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4961 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4962 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4963 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4964 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4965 const bool major_gte_17 = _major_version >= JAVA_17_VERSION; 4966 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4967 4968 bool is_illegal = false; 4969 4970 const char* class_note = ""; 4971 if (is_interface) { 4972 if (major_gte_8) { 4973 // Class file version is JAVA_8_VERSION or later Methods of 4974 // interfaces may set any of the flags except ACC_PROTECTED, 4975 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4976 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4977 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4978 (is_native || is_protected || is_final || is_synchronized) || 4979 // If a specific method of a class or interface has its 4980 // ACC_ABSTRACT flag set, it must not have any of its 4981 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4982 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4983 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4984 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4985 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) { 4986 is_illegal = true; 4987 } 4988 } else if (major_gte_1_5) { 4989 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4990 if (!is_public || is_private || is_protected || is_static || is_final || 4991 is_synchronized || is_native || !is_abstract || is_strict) { 4992 is_illegal = true; 4993 } 4994 } else { 4995 // Class file version is pre-JAVA_1_5_VERSION 4996 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4997 is_illegal = true; 4998 } 4999 } 5000 } else { // not interface 5001 if (has_illegal_visibility(flags)) { 5002 is_illegal = true; 5003 } else { 5004 if (is_initializer) { 5005 if (is_final || is_synchronized || is_native || 5006 is_abstract || (major_gte_1_5 && is_bridge)) { 5007 is_illegal = true; 5008 } 5009 if (!is_static && (!is_inline_type || is_abstract_type)) { 5010 // OK, an object constructor in a regular class or an abstract value class 5011 } else if (is_static && is_inline_type) { 5012 // OK, a static init factory in an inline class 5013 } else { 5014 // but no other combinations are allowed 5015 is_illegal = true; 5016 class_note = (is_inline_type ? " (an inline class)" : " (not an inline class)"); 5017 } 5018 } else { // not initializer 5019 if (is_inline_type && is_synchronized && !is_static) { 5020 is_illegal = true; 5021 class_note = " (an inline class)"; 5022 } else { 5023 if (is_abstract) { 5024 if ((is_final || is_native || is_private || is_static || 5025 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) { 5026 is_illegal = true; 5027 } 5028 } 5029 } 5030 } 5031 } 5032 } 5033 5034 if (is_illegal) { 5035 ResourceMark rm(THREAD); 5036 Exceptions::fthrow( 5037 THREAD_AND_LOCATION, 5038 vmSymbols::java_lang_ClassFormatError(), 5039 "Method %s in class %s%s has illegal modifiers: 0x%X", 5040 name->as_C_string(), _class_name->as_C_string(), class_note, flags); 5041 return; 5042 } 5043 } 5044 5045 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 5046 int length, 5047 TRAPS) const { 5048 assert(_need_verify, "only called when _need_verify is true"); 5049 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 5050 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD); 5051 } 5052 } 5053 5054 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5055 // In class names, '/' separates unqualified names. This is verified in this function also. 5056 // Method names also may not contain the characters '<' or '>', unless <init> 5057 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5058 // method. Because these names have been checked as special cases before 5059 // calling this method in verify_legal_method_name. 5060 // 5061 // This method is also called from the modular system APIs in modules.cpp 5062 // to verify the validity of module and package names. 5063 bool ClassFileParser::verify_unqualified_name(const char* name, 5064 unsigned int length, 5065 int type) { 5066 if (length == 0) return false; // Must have at least one char. 5067 for (const char* p = name; p != name + length; p++) { 5068 switch(*p) { 5069 case JVM_SIGNATURE_DOT: 5070 case JVM_SIGNATURE_ENDCLASS: 5071 case JVM_SIGNATURE_ARRAY: 5072 // do not permit '.', ';', or '[' 5073 return false; 5074 case JVM_SIGNATURE_SLASH: 5075 // check for '//' or leading or trailing '/' which are not legal 5076 // unqualified name must not be empty 5077 if (type == ClassFileParser::LegalClass) { 5078 if (p == name || p+1 >= name+length || 5079 *(p+1) == JVM_SIGNATURE_SLASH) { 5080 return false; 5081 } 5082 } else { 5083 return false; // do not permit '/' unless it's class name 5084 } 5085 break; 5086 case JVM_SIGNATURE_SPECIAL: 5087 case JVM_SIGNATURE_ENDSPECIAL: 5088 // do not permit '<' or '>' in method names 5089 if (type == ClassFileParser::LegalMethod) { 5090 return false; 5091 } 5092 } 5093 } 5094 return true; 5095 } 5096 5097 // Take pointer to a UTF8 byte string (not NUL-terminated). 5098 // Skip over the longest part of the string that could 5099 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true. 5100 // Return a pointer to just past the fieldname. 5101 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5102 // being true, we saw consecutive slashes (meaning we were looking for a 5103 // qualified path but found something that was badly-formed). 5104 static const char* skip_over_field_name(const char* const name, 5105 bool slash_ok, 5106 unsigned int length) { 5107 const char* p; 5108 jboolean last_is_slash = false; 5109 jboolean not_first_ch = false; 5110 5111 for (p = name; p != name + length; not_first_ch = true) { 5112 const char* old_p = p; 5113 jchar ch = *p; 5114 if (ch < 128) { 5115 p++; 5116 // quick check for ascii 5117 if ((ch >= 'a' && ch <= 'z') || 5118 (ch >= 'A' && ch <= 'Z') || 5119 (ch == '_' || ch == '$') || 5120 (not_first_ch && ch >= '0' && ch <= '9')) { 5121 last_is_slash = false; 5122 continue; 5123 } 5124 if (slash_ok && ch == JVM_SIGNATURE_SLASH) { 5125 if (last_is_slash) { 5126 return NULL; // Don't permit consecutive slashes 5127 } 5128 last_is_slash = true; 5129 continue; 5130 } 5131 } 5132 else { 5133 jint unicode_ch; 5134 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5135 p = tmp_p; 5136 last_is_slash = false; 5137 // Check if ch is Java identifier start or is Java identifier part 5138 // 4672820: call java.lang.Character methods directly without generating separate tables. 5139 EXCEPTION_MARK; 5140 // return value 5141 JavaValue result(T_BOOLEAN); 5142 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 5143 JavaCallArguments args; 5144 args.push_int(unicode_ch); 5145 5146 if (not_first_ch) { 5147 // public static boolean isJavaIdentifierPart(char ch); 5148 JavaCalls::call_static(&result, 5149 vmClasses::Character_klass(), 5150 vmSymbols::isJavaIdentifierPart_name(), 5151 vmSymbols::int_bool_signature(), 5152 &args, 5153 THREAD); 5154 } else { 5155 // public static boolean isJavaIdentifierStart(char ch); 5156 JavaCalls::call_static(&result, 5157 vmClasses::Character_klass(), 5158 vmSymbols::isJavaIdentifierStart_name(), 5159 vmSymbols::int_bool_signature(), 5160 &args, 5161 THREAD); 5162 } 5163 if (HAS_PENDING_EXCEPTION) { 5164 CLEAR_PENDING_EXCEPTION; 5165 return NULL; 5166 } 5167 if(result.get_jboolean()) { 5168 continue; 5169 } 5170 } 5171 return (not_first_ch) ? old_p : NULL; 5172 } 5173 return (not_first_ch && !last_is_slash) ? p : NULL; 5174 } 5175 5176 // Take pointer to a UTF8 byte string (not NUL-terminated). 5177 // Skip over the longest part of the string that could 5178 // be taken as a field signature. Allow "void" if void_ok. 5179 // Return a pointer to just past the signature. 5180 // Return NULL if no legal signature is found. 5181 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5182 bool void_ok, 5183 unsigned int length, 5184 TRAPS) const { 5185 unsigned int array_dim = 0; 5186 while (length > 0) { 5187 switch (signature[0]) { 5188 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5189 case JVM_SIGNATURE_BOOLEAN: 5190 case JVM_SIGNATURE_BYTE: 5191 case JVM_SIGNATURE_CHAR: 5192 case JVM_SIGNATURE_SHORT: 5193 case JVM_SIGNATURE_INT: 5194 case JVM_SIGNATURE_FLOAT: 5195 case JVM_SIGNATURE_LONG: 5196 case JVM_SIGNATURE_DOUBLE: 5197 return signature + 1; 5198 case JVM_SIGNATURE_PRIMITIVE_OBJECT: 5199 // Can't enable this check fully until JDK upgrades the bytecode generators. 5200 // For now, compare to class file version 51 so old verifier doesn't see Q signatures. 5201 if (_major_version < 51 /* CONSTANT_CLASS_DESCRIPTORS */ ) { 5202 classfile_parse_error("Class name contains illegal Q-signature " 5203 "in descriptor in class file %s", 5204 CHECK_0); 5205 return NULL; 5206 } 5207 // fall through 5208 case JVM_SIGNATURE_CLASS: 5209 { 5210 if (_major_version < JAVA_1_5_VERSION) { 5211 // Skip over the class name if one is there 5212 const char* const p = skip_over_field_name(signature + 1, true, --length); 5213 5214 // The next character better be a semicolon 5215 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) { 5216 return p + 1; 5217 } 5218 } 5219 else { 5220 // Skip leading 'L' or 'Q' and ignore first appearance of ';' 5221 signature++; 5222 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); 5223 // Format check signature 5224 if (c != NULL) { 5225 int newlen = c - (char*) signature; 5226 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 5227 if (!legal) { 5228 classfile_parse_error("Class name is empty or contains illegal character " 5229 "in descriptor in class file %s", 5230 THREAD); 5231 return NULL; 5232 } 5233 return signature + newlen + 1; 5234 } 5235 } 5236 return NULL; 5237 } 5238 case JVM_SIGNATURE_ARRAY: 5239 array_dim++; 5240 if (array_dim > 255) { 5241 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5242 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD); 5243 return NULL; 5244 } 5245 // The rest of what's there better be a legal signature 5246 signature++; 5247 length--; 5248 void_ok = false; 5249 break; 5250 default: 5251 return NULL; 5252 } 5253 } 5254 return NULL; 5255 } 5256 5257 // Checks if name is a legal class name. 5258 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5259 if (!_need_verify || _relax_verify) { return; } 5260 5261 assert(name->refcount() > 0, "symbol must be kept alive"); 5262 char* bytes = (char*)name->bytes(); 5263 unsigned int length = name->utf8_length(); 5264 bool legal = false; 5265 5266 if (length > 0) { 5267 const char* p; 5268 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5269 p = skip_over_field_signature(bytes, false, length, CHECK); 5270 legal = (p != NULL) && ((p - bytes) == (int)length); 5271 } else if (_major_version < JAVA_1_5_VERSION) { 5272 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5273 p = skip_over_field_name(bytes, true, length); 5274 legal = (p != NULL) && ((p - bytes) == (int)length); 5275 } 5276 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/")) 5277 && bytes[length - 1] == ';' ) { 5278 // Support for L...; and Q...; descriptors 5279 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass); 5280 } else { 5281 // 4900761: relax the constraints based on JSR202 spec 5282 // Class names may be drawn from the entire Unicode character set. 5283 // Identifiers between '/' must be unqualified names. 5284 // The utf8 string has been verified when parsing cpool entries. 5285 legal = verify_unqualified_name(bytes, length, LegalClass); 5286 } 5287 } 5288 if (!legal) { 5289 ResourceMark rm(THREAD); 5290 assert(_class_name != NULL, "invariant"); 5291 Exceptions::fthrow( 5292 THREAD_AND_LOCATION, 5293 vmSymbols::java_lang_ClassFormatError(), 5294 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5295 _class_name->as_C_string() 5296 ); 5297 return; 5298 } 5299 } 5300 5301 // Checks if name is a legal field name. 5302 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5303 if (!_need_verify || _relax_verify) { return; } 5304 5305 char* bytes = (char*)name->bytes(); 5306 unsigned int length = name->utf8_length(); 5307 bool legal = false; 5308 5309 if (length > 0) { 5310 if (_major_version < JAVA_1_5_VERSION) { 5311 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5312 const char* p = skip_over_field_name(bytes, false, length); 5313 legal = (p != NULL) && ((p - bytes) == (int)length); 5314 } 5315 } else { 5316 // 4881221: relax the constraints based on JSR202 spec 5317 legal = verify_unqualified_name(bytes, length, LegalField); 5318 } 5319 } 5320 5321 if (!legal) { 5322 ResourceMark rm(THREAD); 5323 assert(_class_name != NULL, "invariant"); 5324 Exceptions::fthrow( 5325 THREAD_AND_LOCATION, 5326 vmSymbols::java_lang_ClassFormatError(), 5327 "Illegal field name \"%.*s\" in class %s", length, bytes, 5328 _class_name->as_C_string() 5329 ); 5330 return; 5331 } 5332 } 5333 5334 // Checks if name is a legal method name. 5335 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5336 if (!_need_verify || _relax_verify) { return; } 5337 5338 assert(name != NULL, "method name is null"); 5339 char* bytes = (char*)name->bytes(); 5340 unsigned int length = name->utf8_length(); 5341 bool legal = false; 5342 5343 if (length > 0) { 5344 if (bytes[0] == JVM_SIGNATURE_SPECIAL) { 5345 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5346 legal = true; 5347 } 5348 } else if (_major_version < JAVA_1_5_VERSION) { 5349 const char* p; 5350 p = skip_over_field_name(bytes, false, length); 5351 legal = (p != NULL) && ((p - bytes) == (int)length); 5352 } else { 5353 // 4881221: relax the constraints based on JSR202 spec 5354 legal = verify_unqualified_name(bytes, length, LegalMethod); 5355 } 5356 } 5357 5358 if (!legal) { 5359 ResourceMark rm(THREAD); 5360 assert(_class_name != NULL, "invariant"); 5361 Exceptions::fthrow( 5362 THREAD_AND_LOCATION, 5363 vmSymbols::java_lang_ClassFormatError(), 5364 "Illegal method name \"%.*s\" in class %s", length, bytes, 5365 _class_name->as_C_string() 5366 ); 5367 return; 5368 } 5369 } 5370 5371 5372 // Checks if signature is a legal field signature. 5373 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5374 const Symbol* signature, 5375 TRAPS) const { 5376 if (!_need_verify) { return; } 5377 if (!supports_inline_types() && (signature->is_Q_signature() || signature->is_Q_array_signature())) { 5378 throwIllegalSignature("Field", name, signature, CHECK); 5379 } 5380 5381 const char* const bytes = (const char* const)signature->bytes(); 5382 const unsigned int length = signature->utf8_length(); 5383 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5384 5385 if (p == NULL || (p - bytes) != (int)length) { 5386 throwIllegalSignature("Field", name, signature, CHECK); 5387 } 5388 } 5389 5390 // Check that the signature is compatible with the method name. For example, 5391 // check that <init> has a void signature. 5392 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name, 5393 const Symbol* signature, 5394 TRAPS) const { 5395 if (!_need_verify) { 5396 return; 5397 } 5398 5399 // Class initializers cannot have args for class format version >= 51. 5400 if (name == vmSymbols::class_initializer_name() && 5401 signature != vmSymbols::void_method_signature() && 5402 _major_version >= JAVA_7_VERSION) { 5403 throwIllegalSignature("Method", name, signature, THREAD); 5404 return; 5405 } 5406 5407 if (!is_inline_type()) { 5408 int sig_length = signature->utf8_length(); 5409 if (name->utf8_length() > 0 && 5410 name->char_at(0) == JVM_SIGNATURE_SPECIAL && 5411 sig_length > 0 && 5412 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) { 5413 throwIllegalSignature("Method", name, signature, THREAD); 5414 } 5415 } 5416 } 5417 5418 // Checks if signature is a legal method signature. 5419 // Returns number of parameters 5420 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5421 const Symbol* signature, 5422 TRAPS) const { 5423 if (!_need_verify) { 5424 // make sure caller's args_size will be less than 0 even for non-static 5425 // method so it will be recomputed in compute_size_of_parameters(). 5426 return -2; 5427 } 5428 5429 unsigned int args_size = 0; 5430 const char* p = (const char*)signature->bytes(); 5431 unsigned int length = signature->utf8_length(); 5432 const char* nextp; 5433 5434 // The first character must be a '(' 5435 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5436 length--; 5437 // Skip over legal field signatures 5438 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5439 while ((length > 0) && (nextp != NULL)) { 5440 args_size++; 5441 if (p[0] == 'J' || p[0] == 'D') { 5442 args_size++; 5443 } 5444 length -= nextp - p; 5445 p = nextp; 5446 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5447 } 5448 // The first non-signature thing better be a ')' 5449 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5450 length--; 5451 // Now we better just have a return value 5452 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5453 if (nextp && ((int)length == (nextp - p))) { 5454 return args_size; 5455 } 5456 } 5457 } 5458 // Report error 5459 throwIllegalSignature("Method", name, signature, THREAD); 5460 return 0; 5461 } 5462 5463 int ClassFileParser::static_field_size() const { 5464 assert(_field_info != NULL, "invariant"); 5465 return _field_info->_static_field_size; 5466 } 5467 5468 int ClassFileParser::total_oop_map_count() const { 5469 assert(_field_info != NULL, "invariant"); 5470 return _field_info->oop_map_blocks->_nonstatic_oop_map_count; 5471 } 5472 5473 jint ClassFileParser::layout_size() const { 5474 assert(_field_info != NULL, "invariant"); 5475 return _field_info->_instance_size; 5476 } 5477 5478 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5479 const Array<Method*>* methods) { 5480 assert(ik != NULL, "invariant"); 5481 assert(methods != NULL, "invariant"); 5482 5483 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5484 // (We used to do this lazily, but now we query it in Rewriter, 5485 // which is eagerly done for every method, so we might as well do it now, 5486 // when everything is fresh in memory.) 5487 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik); 5488 5489 if (klass_id != vmSymbolID::NO_SID) { 5490 for (int j = 0; j < methods->length(); ++j) { 5491 Method* method = methods->at(j); 5492 method->init_intrinsic_id(klass_id); 5493 5494 if (CheckIntrinsics) { 5495 // Check if an intrinsic is defined for method 'method', 5496 // but the method is not annotated with @IntrinsicCandidate. 5497 if (method->intrinsic_id() != vmIntrinsics::_none && 5498 !method->intrinsic_candidate()) { 5499 tty->print("Compiler intrinsic is defined for method [%s], " 5500 "but the method is not annotated with @IntrinsicCandidate.%s", 5501 method->name_and_sig_as_C_string(), 5502 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5503 ); 5504 tty->cr(); 5505 DEBUG_ONLY(vm_exit(1)); 5506 } 5507 // Check is the method 'method' is annotated with @IntrinsicCandidate, 5508 // but there is no intrinsic available for it. 5509 if (method->intrinsic_candidate() && 5510 method->intrinsic_id() == vmIntrinsics::_none) { 5511 tty->print("Method [%s] is annotated with @IntrinsicCandidate, " 5512 "but no compiler intrinsic is defined for the method.%s", 5513 method->name_and_sig_as_C_string(), 5514 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5515 ); 5516 tty->cr(); 5517 DEBUG_ONLY(vm_exit(1)); 5518 } 5519 } 5520 } // end for 5521 5522 #ifdef ASSERT 5523 if (CheckIntrinsics) { 5524 // Check for orphan methods in the current class. A method m 5525 // of a class C is orphan if an intrinsic is defined for method m, 5526 // but class C does not declare m. 5527 // The check is potentially expensive, therefore it is available 5528 // only in debug builds. 5529 5530 for (auto id : EnumRange<vmIntrinsicID>{}) { 5531 if (vmIntrinsics::_compiledLambdaForm == id) { 5532 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5533 // generated for the JVM from a LambdaForm and therefore no method 5534 // is defined for it. 5535 continue; 5536 } 5537 if (vmIntrinsics::_blackhole == id) { 5538 // The _blackhole intrinsic is a special marker. No explicit method 5539 // is defined for it. 5540 continue; 5541 } 5542 5543 if (vmIntrinsics::class_for(id) == klass_id) { 5544 // Check if the current class contains a method with the same 5545 // name, flags, signature. 5546 bool match = false; 5547 for (int j = 0; j < methods->length(); ++j) { 5548 const Method* method = methods->at(j); 5549 if (method->intrinsic_id() == id) { 5550 match = true; 5551 break; 5552 } 5553 } 5554 5555 if (!match) { 5556 char buf[1000]; 5557 tty->print("Compiler intrinsic is defined for method [%s], " 5558 "but the method is not available in class [%s].%s", 5559 vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)), 5560 ik->name()->as_C_string(), 5561 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5562 ); 5563 tty->cr(); 5564 DEBUG_ONLY(vm_exit(1)); 5565 } 5566 } 5567 } // end for 5568 } // CheckIntrinsics 5569 #endif // ASSERT 5570 } 5571 } 5572 5573 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, 5574 const ClassInstanceInfo& cl_inst_info, 5575 TRAPS) { 5576 if (_klass != NULL) { 5577 return _klass; 5578 } 5579 5580 InstanceKlass* const ik = 5581 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5582 5583 if (is_hidden()) { 5584 mangle_hidden_class_name(ik); 5585 } 5586 5587 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL); 5588 5589 assert(_klass == ik, "invariant"); 5590 return ik; 5591 } 5592 5593 // Return true if the specified class is not a valid super class for an inline type. 5594 // A valid super class for an inline type is abstract, has no instance fields, 5595 // is not declared with the identity modifier (checked elsewhere), has 5596 // an empty body-less no-arg constructor, and no synchronized instance methods. 5597 // This function doesn't check if the class's super types are invalid. Those checks 5598 // are done elsewhere. The final determination of whether or not a class is an 5599 // invalid super type for an inline class is done in fill_instance_klass(). 5600 bool ClassFileParser::is_invalid_super_for_inline_type() { 5601 if (is_interface() || class_name() == vmSymbols::java_lang_Object()) { 5602 return false; 5603 } 5604 if (!access_flags().is_abstract() || _has_nonstatic_fields) { 5605 return true; 5606 } else { 5607 // Look at each method 5608 for (int x = 0; x < _methods->length(); x++) { 5609 const Method* const method = _methods->at(x); 5610 if (method->is_synchronized() && !method->is_static()) { 5611 return true; 5612 5613 } else if (method->name() == vmSymbols::object_initializer_name()) { 5614 if (method->signature() != vmSymbols::void_method_signature() || 5615 !method->is_vanilla_constructor()) { 5616 return true; 5617 } 5618 } 5619 } 5620 } 5621 return false; 5622 } 5623 5624 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, 5625 bool changed_by_loadhook, 5626 const ClassInstanceInfo& cl_inst_info, 5627 TRAPS) { 5628 assert(ik != NULL, "invariant"); 5629 5630 // Set name and CLD before adding to CLD 5631 ik->set_class_loader_data(_loader_data); 5632 ik->set_name(_class_name); 5633 5634 // Add all classes to our internal class loader list here, 5635 // including classes in the bootstrap (NULL) class loader. 5636 const bool publicize = !is_internal(); 5637 5638 _loader_data->add_class(ik, publicize); 5639 5640 set_klass_to_deallocate(ik); 5641 5642 assert(_field_info != NULL, "invariant"); 5643 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity"); 5644 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count, 5645 "sanity"); 5646 5647 assert(ik->is_instance_klass(), "sanity"); 5648 assert(ik->size_helper() == _field_info->_instance_size, "sanity"); 5649 5650 // Fill in information already parsed 5651 ik->set_should_verify_class(_need_verify); 5652 5653 // Not yet: supers are done below to support the new subtype-checking fields 5654 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size); 5655 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields); 5656 if (_field_info->_is_naturally_atomic && ik->is_inline_klass()) { 5657 ik->set_is_naturally_atomic(); 5658 } 5659 5660 if (this->_invalid_inline_super) { 5661 ik->set_invalid_inline_super(); 5662 } 5663 5664 assert(_fac != NULL, "invariant"); 5665 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_INLINE]); 5666 5667 // this transfers ownership of a lot of arrays from 5668 // the parser onto the InstanceKlass* 5669 apply_parsed_class_metadata(ik, _java_fields_count); 5670 5671 // can only set dynamic nest-host after static nest information is set 5672 if (cl_inst_info.dynamic_nest_host() != NULL) { 5673 ik->set_nest_host(cl_inst_info.dynamic_nest_host()); 5674 } 5675 5676 // note that is not safe to use the fields in the parser from this point on 5677 assert(NULL == _cp, "invariant"); 5678 assert(NULL == _fields, "invariant"); 5679 assert(NULL == _methods, "invariant"); 5680 assert(NULL == _inner_classes, "invariant"); 5681 assert(NULL == _nest_members, "invariant"); 5682 assert(NULL == _preload_classes, "invariant"); 5683 assert(NULL == _combined_annotations, "invariant"); 5684 assert(NULL == _record_components, "invariant"); 5685 assert(NULL == _permitted_subclasses, "invariant"); 5686 5687 if (_has_final_method) { 5688 ik->set_has_final_method(); 5689 } 5690 5691 ik->copy_method_ordering(_method_ordering, CHECK); 5692 // The InstanceKlass::_methods_jmethod_ids cache 5693 // is managed on the assumption that the initial cache 5694 // size is equal to the number of methods in the class. If 5695 // that changes, then InstanceKlass::idnum_can_increment() 5696 // has to be changed accordingly. 5697 ik->set_initial_method_idnum(ik->methods()->length()); 5698 5699 ik->set_this_class_index(_this_class_index); 5700 5701 if (_is_hidden) { 5702 // _this_class_index is a CONSTANT_Class entry that refers to this 5703 // hidden class itself. If this class needs to refer to its own methods 5704 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference 5705 // _this_class_index. However, because this class is hidden (it's 5706 // not stored in SystemDictionary), _this_class_index cannot be resolved 5707 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5708 // Therefore, we must eagerly resolve _this_class_index now. 5709 ik->constants()->klass_at_put(_this_class_index, ik); 5710 } 5711 5712 ik->set_minor_version(_minor_version); 5713 ik->set_major_version(_major_version); 5714 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5715 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5716 if (_is_declared_atomic) { 5717 ik->set_is_declared_atomic(); 5718 } 5719 5720 if (_is_hidden) { 5721 ik->set_is_hidden(); 5722 } 5723 5724 // Set PackageEntry for this_klass 5725 oop cl = ik->class_loader(); 5726 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5727 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5728 ik->set_package(cld, NULL, CHECK); 5729 5730 const Array<Method*>* const methods = ik->methods(); 5731 assert(methods != NULL, "invariant"); 5732 const int methods_len = methods->length(); 5733 5734 check_methods_for_intrinsics(ik, methods); 5735 5736 // Fill in field values obtained by parse_classfile_attributes 5737 if (_parsed_annotations->has_any_annotations()) { 5738 _parsed_annotations->apply_to(ik); 5739 } 5740 5741 apply_parsed_class_attributes(ik); 5742 5743 // Miranda methods 5744 if ((_num_miranda_methods > 0) || 5745 // if this class introduced new miranda methods or 5746 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5747 // super class exists and this class inherited miranda methods 5748 ) { 5749 ik->set_has_miranda_methods(); // then set a flag 5750 } 5751 5752 // Fill in information needed to compute superclasses. 5753 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5754 ik->set_transitive_interfaces(_transitive_interfaces); 5755 ik->set_local_interfaces(_local_interfaces); 5756 _transitive_interfaces = NULL; 5757 _local_interfaces = NULL; 5758 5759 // Initialize itable offset tables 5760 klassItable::setup_itable_offset_table(ik); 5761 5762 // Compute transitive closure of interfaces this class implements 5763 // Do final class setup 5764 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks; 5765 if (oop_map_blocks->_nonstatic_oop_map_count > 0) { 5766 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); 5767 } 5768 5769 if (_has_contended_fields || _parsed_annotations->is_contended() || 5770 ( _super_klass != NULL && _super_klass->has_contended_annotations())) { 5771 ik->set_has_contended_annotations(true); 5772 } 5773 5774 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5775 set_precomputed_flags(ik); 5776 5777 // check if this class can access its super class 5778 check_super_class_access(ik, CHECK); 5779 5780 // check if this class can access its superinterfaces 5781 check_super_interface_access(ik, CHECK); 5782 5783 // check if this class overrides any final method 5784 check_final_method_override(ik, CHECK); 5785 5786 // reject static interface methods prior to Java 8 5787 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5788 check_illegal_static_method(ik, CHECK); 5789 } 5790 5791 // Obtain this_klass' module entry 5792 ModuleEntry* module_entry = ik->module(); 5793 assert(module_entry != NULL, "module_entry should always be set"); 5794 5795 // Obtain java.lang.Module 5796 Handle module_handle(THREAD, module_entry->module()); 5797 5798 // Allocate mirror and initialize static fields 5799 // The create_mirror() call will also call compute_modifiers() 5800 java_lang_Class::create_mirror(ik, 5801 Handle(THREAD, _loader_data->class_loader()), 5802 module_handle, 5803 _protection_domain, 5804 cl_inst_info.class_data(), 5805 CHECK); 5806 5807 assert(_all_mirandas != NULL, "invariant"); 5808 5809 // Generate any default methods - default methods are public interface methods 5810 // that have a default implementation. This is new with Java 8. 5811 if (_has_nonstatic_concrete_methods) { 5812 DefaultMethods::generate_default_methods(ik, 5813 _all_mirandas, 5814 CHECK); 5815 } 5816 5817 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5818 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5819 !module_entry->has_default_read_edges()) { 5820 if (!module_entry->set_has_default_read_edges()) { 5821 // We won a potential race 5822 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5823 } 5824 } 5825 5826 bool all_fields_empty = true; 5827 for (AllFieldStream fs(ik->fields(), ik->constants()); !fs.done(); fs.next()) { 5828 if (!fs.access_flags().is_static()) { 5829 if (fs.field_descriptor().is_inline_type()) { 5830 Klass* k = _inline_type_field_klasses->at(fs.index()); 5831 ik->set_inline_type_field_klass(fs.index(), k); 5832 if (!InlineKlass::cast(k)->is_empty_inline_type()) { all_fields_empty = false; } 5833 } else { 5834 all_fields_empty = false; 5835 } 5836 } else if (is_inline_type() && (fs.name() == vmSymbols::default_value_name())) { 5837 InlineKlass::cast(ik)->set_default_value_offset(ik->field_offset(fs.index())); 5838 } 5839 } 5840 5841 if (_is_empty_inline_type || (is_inline_type() && all_fields_empty)) { 5842 ik->set_is_empty_inline_type(); 5843 } 5844 5845 if (is_inline_type()) { 5846 InlineKlass* vk = InlineKlass::cast(ik); 5847 vk->set_alignment(_alignment); 5848 vk->set_first_field_offset(_first_field_offset); 5849 vk->set_exact_size_in_bytes(_exact_size_in_bytes); 5850 InlineKlass::cast(ik)->initialize_calling_convention(CHECK); 5851 } 5852 5853 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5854 5855 if (!is_internal()) { 5856 ik->print_class_load_logging(_loader_data, module_entry, _stream); 5857 5858 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5859 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && 5860 log_is_enabled(Info, class, preview)) { 5861 ResourceMark rm; 5862 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5863 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); 5864 } 5865 5866 if (log_is_enabled(Debug, class, resolve)) { 5867 ResourceMark rm; 5868 // print out the superclass. 5869 const char * from = ik->external_name(); 5870 if (ik->java_super() != NULL) { 5871 log_debug(class, resolve)("%s %s (super)", 5872 from, 5873 ik->java_super()->external_name()); 5874 } 5875 // print out each of the interface classes referred to by this class. 5876 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5877 if (local_interfaces != NULL) { 5878 const int length = local_interfaces->length(); 5879 for (int i = 0; i < length; i++) { 5880 const InstanceKlass* const k = local_interfaces->at(i); 5881 const char * to = k->external_name(); 5882 log_debug(class, resolve)("%s %s (interface)", from, to); 5883 } 5884 } 5885 } 5886 } 5887 5888 JFR_ONLY(INIT_ID(ik);) 5889 5890 // If we reach here, all is well. 5891 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5892 // in order for it to not be destroyed in the ClassFileParser destructor. 5893 set_klass_to_deallocate(NULL); 5894 5895 // it's official 5896 set_klass(ik); 5897 5898 debug_only(ik->verify();) 5899 } 5900 5901 void ClassFileParser::update_class_name(Symbol* new_class_name) { 5902 // Decrement the refcount in the old name, since we're clobbering it. 5903 _class_name->decrement_refcount(); 5904 5905 _class_name = new_class_name; 5906 // Increment the refcount of the new name. 5907 // Now the ClassFileParser owns this name and will decrement in 5908 // the destructor. 5909 _class_name->increment_refcount(); 5910 } 5911 5912 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5913 bool trusted = loader_data->is_boot_class_loader_data() || 5914 loader_data->is_platform_class_loader_data(); 5915 bool need_verify = 5916 // verifyAll 5917 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5918 // verifyRemote 5919 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5920 return !need_verify; 5921 } 5922 5923 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5924 Symbol* name, 5925 ClassLoaderData* loader_data, 5926 const ClassLoadInfo* cl_info, 5927 Publicity pub_level, 5928 TRAPS) : 5929 _stream(stream), 5930 _class_name(NULL), 5931 _loader_data(loader_data), 5932 _is_hidden(cl_info->is_hidden()), 5933 _can_access_vm_annotations(cl_info->can_access_vm_annotations()), 5934 _orig_cp_size(0), 5935 _super_klass(), 5936 _cp(NULL), 5937 _fields(NULL), 5938 _methods(NULL), 5939 _inner_classes(NULL), 5940 _nest_members(NULL), 5941 _nest_host(0), 5942 _permitted_subclasses(NULL), 5943 _preload_classes(NULL), 5944 _record_components(NULL), 5945 _temp_local_interfaces(NULL), 5946 _local_interfaces(NULL), 5947 _transitive_interfaces(NULL), 5948 _combined_annotations(NULL), 5949 _class_annotations(NULL), 5950 _class_type_annotations(NULL), 5951 _fields_annotations(NULL), 5952 _fields_type_annotations(NULL), 5953 _klass(NULL), 5954 _klass_to_deallocate(NULL), 5955 _parsed_annotations(NULL), 5956 _fac(NULL), 5957 _field_info(NULL), 5958 _inline_type_field_klasses(NULL), 5959 _method_ordering(NULL), 5960 _all_mirandas(NULL), 5961 _vtable_size(0), 5962 _itable_size(0), 5963 _num_miranda_methods(0), 5964 _rt(REF_NONE), 5965 _protection_domain(cl_info->protection_domain()), 5966 _access_flags(), 5967 _pub_level(pub_level), 5968 _bad_constant_seen(0), 5969 _synthetic_flag(false), 5970 _sde_length(false), 5971 _sde_buffer(NULL), 5972 _sourcefile_index(0), 5973 _generic_signature_index(0), 5974 _major_version(0), 5975 _minor_version(0), 5976 _this_class_index(0), 5977 _super_class_index(0), 5978 _itfs_len(0), 5979 _java_fields_count(0), 5980 _need_verify(false), 5981 _relax_verify(false), 5982 _has_nonstatic_concrete_methods(false), 5983 _declares_nonstatic_concrete_methods(false), 5984 _has_final_method(false), 5985 _has_contended_fields(false), 5986 _has_inline_type_fields(false), 5987 _has_nonstatic_fields(false), 5988 _is_empty_inline_type(false), 5989 _is_naturally_atomic(false), 5990 _is_declared_atomic(false), 5991 _invalid_inline_super(false), 5992 _invalid_identity_super(false), 5993 _has_finalizer(false), 5994 _has_empty_finalizer(false), 5995 _has_vanilla_constructor(false), 5996 _max_bootstrap_specifier_index(-1) { 5997 5998 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 5999 _class_name->increment_refcount(); 6000 6001 assert(_loader_data != NULL, "invariant"); 6002 assert(stream != NULL, "invariant"); 6003 assert(_stream != NULL, "invariant"); 6004 assert(_stream->buffer() == _stream->current(), "invariant"); 6005 assert(_class_name != NULL, "invariant"); 6006 assert(0 == _access_flags.as_int(), "invariant"); 6007 6008 // Figure out whether we can skip format checking (matching classic VM behavior) 6009 if (DumpSharedSpaces) { 6010 // verify == true means it's a 'remote' class (i.e., non-boot class) 6011 // Verification decision is based on BytecodeVerificationRemote flag 6012 // for those classes. 6013 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 6014 BytecodeVerificationLocal; 6015 } 6016 else { 6017 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 6018 stream->need_verify()); 6019 } 6020 6021 // synch back verification state to stream 6022 stream->set_verify(_need_verify); 6023 6024 // Check if verification needs to be relaxed for this class file 6025 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 6026 _relax_verify = relax_format_check_for(_loader_data); 6027 6028 parse_stream(stream, CHECK); 6029 6030 post_process_parsed_stream(stream, _cp, CHECK); 6031 } 6032 6033 void ClassFileParser::clear_class_metadata() { 6034 // metadata created before the instance klass is created. Must be 6035 // deallocated if classfile parsing returns an error. 6036 _cp = NULL; 6037 _fields = NULL; 6038 _methods = NULL; 6039 _inner_classes = NULL; 6040 _nest_members = NULL; 6041 _permitted_subclasses = NULL; 6042 _preload_classes = NULL; 6043 _combined_annotations = NULL; 6044 _class_annotations = _class_type_annotations = NULL; 6045 _fields_annotations = _fields_type_annotations = NULL; 6046 _record_components = NULL; 6047 } 6048 6049 // Destructor to clean up 6050 ClassFileParser::~ClassFileParser() { 6051 _class_name->decrement_refcount(); 6052 6053 if (_cp != NULL) { 6054 MetadataFactory::free_metadata(_loader_data, _cp); 6055 } 6056 if (_fields != NULL) { 6057 MetadataFactory::free_array<u2>(_loader_data, _fields); 6058 } 6059 6060 if (_inline_type_field_klasses != NULL) { 6061 MetadataFactory::free_array<InlineKlass*>(_loader_data, _inline_type_field_klasses); 6062 } 6063 6064 if (_methods != NULL) { 6065 // Free methods 6066 InstanceKlass::deallocate_methods(_loader_data, _methods); 6067 } 6068 6069 // beware of the Universe::empty_blah_array!! 6070 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 6071 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 6072 } 6073 6074 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) { 6075 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 6076 } 6077 6078 if (_record_components != NULL) { 6079 InstanceKlass::deallocate_record_components(_loader_data, _record_components); 6080 } 6081 6082 if (_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array()) { 6083 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses); 6084 } 6085 6086 if (_preload_classes != NULL && _preload_classes != Universe::the_empty_short_array()) { 6087 MetadataFactory::free_array<u2>(_loader_data, _preload_classes); 6088 } 6089 6090 // Free interfaces 6091 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 6092 _local_interfaces, _transitive_interfaces); 6093 6094 if (_combined_annotations != NULL) { 6095 // After all annotations arrays have been created, they are installed into the 6096 // Annotations object that will be assigned to the InstanceKlass being created. 6097 6098 // Deallocate the Annotations object and the installed annotations arrays. 6099 _combined_annotations->deallocate_contents(_loader_data); 6100 6101 // If the _combined_annotations pointer is non-NULL, 6102 // then the other annotations fields should have been cleared. 6103 assert(_class_annotations == NULL, "Should have been cleared"); 6104 assert(_class_type_annotations == NULL, "Should have been cleared"); 6105 assert(_fields_annotations == NULL, "Should have been cleared"); 6106 assert(_fields_type_annotations == NULL, "Should have been cleared"); 6107 } else { 6108 // If the annotations arrays were not installed into the Annotations object, 6109 // then they have to be deallocated explicitly. 6110 MetadataFactory::free_array<u1>(_loader_data, _class_annotations); 6111 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations); 6112 Annotations::free_contents(_loader_data, _fields_annotations); 6113 Annotations::free_contents(_loader_data, _fields_type_annotations); 6114 } 6115 6116 clear_class_metadata(); 6117 _transitive_interfaces = NULL; 6118 _local_interfaces = NULL; 6119 6120 // deallocate the klass if already created. Don't directly deallocate, but add 6121 // to the deallocate list so that the klass is removed from the CLD::_klasses list 6122 // at a safepoint. 6123 if (_klass_to_deallocate != NULL) { 6124 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 6125 } 6126 } 6127 6128 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 6129 TRAPS) { 6130 6131 assert(stream != NULL, "invariant"); 6132 assert(_class_name != NULL, "invariant"); 6133 6134 // BEGIN STREAM PARSING 6135 stream->guarantee_more(8, CHECK); // magic, major, minor 6136 // Magic value 6137 const u4 magic = stream->get_u4_fast(); 6138 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 6139 "Incompatible magic value %u in class file %s", 6140 magic, CHECK); 6141 6142 // Version numbers 6143 _minor_version = stream->get_u2_fast(); 6144 _major_version = stream->get_u2_fast(); 6145 6146 // Check version numbers - we check this even with verifier off 6147 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 6148 6149 stream->guarantee_more(3, CHECK); // length, first cp tag 6150 u2 cp_size = stream->get_u2_fast(); 6151 6152 guarantee_property( 6153 cp_size >= 1, "Illegal constant pool size %u in class file %s", 6154 cp_size, CHECK); 6155 6156 _orig_cp_size = cp_size; 6157 if (is_hidden()) { // Add a slot for hidden class name. 6158 cp_size++; 6159 } 6160 6161 _cp = ConstantPool::allocate(_loader_data, 6162 cp_size, 6163 CHECK); 6164 6165 ConstantPool* const cp = _cp; 6166 6167 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6168 6169 assert(cp_size == (const u2)cp->length(), "invariant"); 6170 6171 // ACCESS FLAGS 6172 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6173 6174 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS; 6175 // JVM_ACC_MODULE is defined in JDK-9 and later. 6176 if (_major_version >= JAVA_9_VERSION) { 6177 recognized_modifiers |= JVM_ACC_MODULE; 6178 } 6179 // JVM_ACC_VALUE and JVM_ACC_PRIMITIVE are defined for class file version 55 and later 6180 if (supports_inline_types()) { 6181 recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE; 6182 } 6183 6184 // Access flags 6185 jint flags = stream->get_u2_fast() & recognized_modifiers; 6186 6187 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6188 // Set abstract bit for old class files for backward compatibility 6189 flags |= JVM_ACC_ABSTRACT; 6190 } 6191 6192 verify_legal_class_modifiers(flags, CHECK); 6193 6194 short bad_constant = class_bad_constant_seen(); 6195 if (bad_constant != 0) { 6196 // Do not throw CFE until after the access_flags are checked because if 6197 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6198 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD); 6199 return; 6200 } 6201 6202 _access_flags.set_flags(flags); 6203 6204 // This class and superclass 6205 _this_class_index = stream->get_u2_fast(); 6206 check_property( 6207 valid_cp_range(_this_class_index, cp_size) && 6208 cp->tag_at(_this_class_index).is_unresolved_klass(), 6209 "Invalid this class index %u in constant pool in class file %s", 6210 _this_class_index, CHECK); 6211 6212 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6213 assert(class_name_in_cp != NULL, "class_name can't be null"); 6214 6215 // Don't need to check whether this class name is legal or not. 6216 // It has been checked when constant pool is parsed. 6217 // However, make sure it is not an array type. 6218 if (_need_verify) { 6219 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY, 6220 "Bad class name in class file %s", 6221 CHECK); 6222 } 6223 6224 #ifdef ASSERT 6225 // Basic sanity checks 6226 if (_is_hidden) { 6227 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name"); 6228 } 6229 #endif 6230 6231 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class. 6232 6233 if (_is_hidden) { 6234 assert(_class_name != NULL, "Unexpected null _class_name"); 6235 #ifdef ASSERT 6236 if (_need_verify) { 6237 verify_legal_class_name(_class_name, CHECK); 6238 } 6239 #endif 6240 6241 } else { 6242 // Check if name in class file matches given name 6243 if (_class_name != class_name_in_cp) { 6244 if (_class_name != vmSymbols::unknown_class_name()) { 6245 ResourceMark rm(THREAD); 6246 Exceptions::fthrow(THREAD_AND_LOCATION, 6247 vmSymbols::java_lang_NoClassDefFoundError(), 6248 "%s (wrong name: %s)", 6249 class_name_in_cp->as_C_string(), 6250 _class_name->as_C_string() 6251 ); 6252 return; 6253 } else { 6254 // The class name was not known by the caller so we set it from 6255 // the value in the CP. 6256 update_class_name(class_name_in_cp); 6257 } 6258 // else nothing to do: the expected class name matches what is in the CP 6259 } 6260 } 6261 6262 // Verification prevents us from creating names with dots in them, this 6263 // asserts that that's the case. 6264 assert(is_internal_format(_class_name), "external class name format used internally"); 6265 6266 if (!is_internal()) { 6267 LogTarget(Debug, class, preorder) lt; 6268 if (lt.is_enabled()){ 6269 ResourceMark rm(THREAD); 6270 LogStream ls(lt); 6271 ls.print("%s", _class_name->as_klass_external_name()); 6272 if (stream->source() != NULL) { 6273 ls.print(" source: %s", stream->source()); 6274 } 6275 ls.cr(); 6276 } 6277 } 6278 6279 // SUPERKLASS 6280 _super_class_index = stream->get_u2_fast(); 6281 _super_klass = parse_super_class(cp, 6282 _super_class_index, 6283 _need_verify, 6284 CHECK); 6285 6286 // Interfaces 6287 _itfs_len = stream->get_u2_fast(); 6288 parse_interfaces(stream, 6289 _itfs_len, 6290 cp, 6291 &_has_nonstatic_concrete_methods, 6292 &_is_declared_atomic, 6293 CHECK); 6294 6295 assert(_temp_local_interfaces != NULL, "invariant"); 6296 6297 // Fields (offsets are filled in later) 6298 _fac = new FieldAllocationCount(); 6299 parse_fields(stream, 6300 is_interface(), 6301 is_inline_type(), 6302 is_permits_value_class(), 6303 _fac, 6304 cp, 6305 cp_size, 6306 &_java_fields_count, 6307 CHECK); 6308 6309 assert(_fields != NULL, "invariant"); 6310 6311 // Methods 6312 AccessFlags promoted_flags; 6313 parse_methods(stream, 6314 is_interface(), 6315 is_inline_type(), 6316 is_abstract_type(), 6317 &promoted_flags, 6318 &_has_final_method, 6319 &_declares_nonstatic_concrete_methods, 6320 CHECK); 6321 6322 assert(_methods != NULL, "invariant"); 6323 6324 // promote flags from parse_methods() to the klass' flags 6325 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6326 6327 if (_declares_nonstatic_concrete_methods) { 6328 _has_nonstatic_concrete_methods = true; 6329 } 6330 6331 // Additional attributes/annotations 6332 _parsed_annotations = new ClassAnnotationCollector(); 6333 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6334 6335 assert(_inner_classes != NULL, "invariant"); 6336 6337 // Finalize the Annotations metadata object, 6338 // now that all annotation arrays have been created. 6339 create_combined_annotations(CHECK); 6340 6341 // Make sure this is the end of class file stream 6342 guarantee_property(stream->at_eos(), 6343 "Extra bytes at the end of class file %s", 6344 CHECK); 6345 6346 // all bytes in stream read and parsed 6347 } 6348 6349 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) { 6350 ResourceMark rm; 6351 // Construct hidden name from _class_name, "+", and &ik. Note that we can't 6352 // use a '/' because that confuses finding the class's package. Also, can't 6353 // use an illegal char such as ';' because that causes serialization issues 6354 // and issues with hidden classes that create their own hidden classes. 6355 char addr_buf[20]; 6356 if (DumpSharedSpaces) { 6357 // We want stable names for the archived hidden classes (only for static 6358 // archive for now). Spaces under default_SharedBaseAddress() will be 6359 // occupied by the archive at run time, so we know that no dynamically 6360 // loaded InstanceKlass will be placed under there. 6361 static volatile size_t counter = 0; 6362 Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it 6363 size_t new_id = Atomic::add(&counter, (size_t)1); 6364 jio_snprintf(addr_buf, 20, SIZE_FORMAT_HEX, new_id); 6365 } else { 6366 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik)); 6367 } 6368 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf); 6369 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len); 6370 jio_snprintf(new_name, new_name_len, "%s+%s", 6371 _class_name->as_C_string(), addr_buf); 6372 update_class_name(SymbolTable::new_symbol(new_name)); 6373 6374 // Add a Utf8 entry containing the hidden name. 6375 assert(_class_name != NULL, "Unexpected null _class_name"); 6376 int hidden_index = _orig_cp_size; // this is an extra slot we added 6377 _cp->symbol_at_put(hidden_index, _class_name); 6378 6379 // Update this_class_index's slot in the constant pool with the new Utf8 entry. 6380 // We have to update the resolved_klass_index and the name_index together 6381 // so extract the existing resolved_klass_index first. 6382 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index); 6383 int resolved_klass_index = cp_klass_slot.resolved_klass_index(); 6384 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index); 6385 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size, 6386 "Bad name_index"); 6387 } 6388 6389 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6390 ConstantPool* cp, 6391 TRAPS) { 6392 assert(stream != NULL, "invariant"); 6393 assert(stream->at_eos(), "invariant"); 6394 assert(cp != NULL, "invariant"); 6395 assert(_loader_data != NULL, "invariant"); 6396 6397 if (_class_name == vmSymbols::java_lang_Object()) { 6398 check_property(_temp_local_interfaces->length() == 0, 6399 "java.lang.Object cannot implement an interface in class file %s", 6400 CHECK); 6401 } 6402 // We check super class after class file is parsed and format is checked 6403 if (_super_class_index > 0 && NULL == _super_klass) { 6404 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6405 if (is_interface()) { 6406 // Before attempting to resolve the superclass, check for class format 6407 // errors not checked yet. 6408 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6409 "Interfaces must have java.lang.Object as superclass in class file %s", 6410 CHECK); 6411 } 6412 Handle loader(THREAD, _loader_data->class_loader()); 6413 _super_klass = (const InstanceKlass*) 6414 SystemDictionary::resolve_super_or_fail(_class_name, 6415 super_class_name, 6416 loader, 6417 _protection_domain, 6418 true, 6419 CHECK); 6420 } 6421 6422 if (_super_klass != NULL) { 6423 if (_super_klass->has_nonstatic_concrete_methods()) { 6424 _has_nonstatic_concrete_methods = true; 6425 } 6426 if (_super_klass->is_declared_atomic()) { 6427 _is_declared_atomic = true; 6428 } 6429 6430 if (_super_klass->is_interface()) { 6431 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD); 6432 return; 6433 } 6434 6435 // For an inline class, only java/lang/Object or special abstract classes 6436 // are acceptable super classes. 6437 if (is_inline_type()) { 6438 const InstanceKlass* super_ik = _super_klass; 6439 if (super_ik->invalid_inline_super()) { 6440 classfile_icce_error("inline class %s has an invalid super class %s", _super_klass, THREAD); 6441 return; 6442 } 6443 } 6444 } 6445 6446 if (_class_name == vmSymbols::java_lang_NonTearable() && _loader_data->class_loader() == NULL) { 6447 // This is the original source of this condition. 6448 // It propagates by inheritance, as if testing "instanceof NonTearable". 6449 _is_declared_atomic = true; 6450 } else if (*ForceNonTearable != '\0') { 6451 // Allow a command line switch to force the same atomicity property: 6452 const char* class_name_str = _class_name->as_C_string(); 6453 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) { 6454 _is_declared_atomic = true; 6455 } 6456 } 6457 6458 // Set ik->invalid_inline_super field to TRUE if already marked as invalid, 6459 // if super is marked invalid, or if is_invalid_super_for_inline_type() 6460 // returns true 6461 if (invalid_inline_super() || 6462 (_super_klass != NULL && _super_klass->invalid_inline_super()) || 6463 is_invalid_super_for_inline_type()) { 6464 set_invalid_inline_super(); 6465 } 6466 6467 int itfs_len = _temp_local_interfaces->length(); 6468 if (itfs_len == 0) { 6469 _local_interfaces = Universe::the_empty_instance_klass_array(); 6470 } else { 6471 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK); 6472 for (int i = 0; i < itfs_len; i++) { 6473 _local_interfaces->at_put(i, _temp_local_interfaces->at(i)); 6474 } 6475 } 6476 _temp_local_interfaces = NULL; 6477 assert(_local_interfaces != NULL, "invariant"); 6478 6479 // Compute the transitive list of all unique interfaces implemented by this class 6480 _transitive_interfaces = 6481 compute_transitive_interfaces(_super_klass, 6482 _local_interfaces, 6483 _loader_data, 6484 CHECK); 6485 6486 assert(_transitive_interfaces != NULL, "invariant"); 6487 6488 // sort methods 6489 _method_ordering = sort_methods(_methods); 6490 6491 _all_mirandas = new GrowableArray<Method*>(20); 6492 6493 Handle loader(THREAD, _loader_data->class_loader()); 6494 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6495 &_num_miranda_methods, 6496 _all_mirandas, 6497 _super_klass, 6498 _methods, 6499 _access_flags, 6500 _major_version, 6501 loader, 6502 _class_name, 6503 _local_interfaces); 6504 6505 // Size of Java itable (in words) 6506 _itable_size = is_interface() ? 0 : 6507 klassItable::compute_itable_size(_transitive_interfaces); 6508 6509 assert(_fac != NULL, "invariant"); 6510 assert(_parsed_annotations != NULL, "invariant"); 6511 6512 6513 if (EnableValhalla) { 6514 _inline_type_field_klasses = MetadataFactory::new_array<InlineKlass*>(_loader_data, 6515 java_fields_count(), 6516 NULL, 6517 CHECK); 6518 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 6519 if (Signature::basic_type(fs.signature()) == T_PRIMITIVE_OBJECT && !fs.access_flags().is_static()) { 6520 // Pre-load inline class 6521 Klass* klass = SystemDictionary::resolve_inline_type_field_or_fail(&fs, 6522 Handle(THREAD, _loader_data->class_loader()), 6523 _protection_domain, true, CHECK); 6524 assert(klass != NULL, "Sanity check"); 6525 if (!klass->access_flags().is_value_class()) { 6526 assert(klass->is_instance_klass(), "Sanity check"); 6527 ResourceMark rm(THREAD); 6528 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 6529 err_msg("Class %s expects class %s to be an inline type, but it is not", 6530 _class_name->as_C_string(), 6531 InstanceKlass::cast(klass)->external_name())); 6532 } 6533 _inline_type_field_klasses->at_put(fs.index(), InlineKlass::cast(klass)); 6534 } 6535 } 6536 } 6537 6538 _field_info = new FieldLayoutInfo(); 6539 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields, 6540 _parsed_annotations->is_contended(), is_inline_type(), 6541 _field_info, _inline_type_field_klasses); 6542 lb.build_layout(CHECK); 6543 if (is_inline_type()) { 6544 _alignment = lb.get_alignment(); 6545 _first_field_offset = lb.get_first_field_offset(); 6546 _exact_size_in_bytes = lb.get_exact_size_in_byte(); 6547 } 6548 _has_inline_type_fields = _field_info->_has_inline_fields; 6549 6550 // Compute reference type 6551 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6552 } 6553 6554 void ClassFileParser::set_klass(InstanceKlass* klass) { 6555 6556 #ifdef ASSERT 6557 if (klass != NULL) { 6558 assert(NULL == _klass, "leaking?"); 6559 } 6560 #endif 6561 6562 _klass = klass; 6563 } 6564 6565 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6566 6567 #ifdef ASSERT 6568 if (klass != NULL) { 6569 assert(NULL == _klass_to_deallocate, "leaking?"); 6570 } 6571 #endif 6572 6573 _klass_to_deallocate = klass; 6574 } 6575 6576 // Caller responsible for ResourceMark 6577 // clone stream with rewound position 6578 const ClassFileStream* ClassFileParser::clone_stream() const { 6579 assert(_stream != NULL, "invariant"); 6580 6581 return _stream->clone(); 6582 } 6583 6584 // ---------------------------------------------------------------------------- 6585 // debugging 6586 6587 #ifdef ASSERT 6588 6589 // return true if class_name contains no '.' (internal format is '/') 6590 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6591 if (class_name != NULL) { 6592 ResourceMark rm; 6593 char* name = class_name->as_C_string(); 6594 return strchr(name, JVM_SIGNATURE_DOT) == NULL; 6595 } else { 6596 return true; 6597 } 6598 } 6599 6600 #endif