1 /* 2 * Copyright (c) 1997, 2020, 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 #include "precompiled.hpp" 25 #include "jvm.h" 26 #include "aot/aotLoader.hpp" 27 #include "classfile/classFileParser.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/defaultMethods.hpp" 32 #include "classfile/dictionary.hpp" 33 #include "classfile/javaClasses.inline.hpp" 34 #include "classfile/moduleEntry.hpp" 35 #include "classfile/packageEntry.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/verificationType.hpp" 39 #include "classfile/verifier.hpp" 40 #include "classfile/vmSymbols.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.hpp" 44 #include "memory/metadataFactory.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "memory/universe.hpp" 48 #include "oops/annotations.hpp" 49 #include "oops/constantPool.inline.hpp" 50 #include "oops/fieldStreams.inline.hpp" 51 #include "oops/instanceKlass.hpp" 52 #include "oops/instanceMirrorKlass.hpp" 53 #include "oops/klass.inline.hpp" 54 #include "oops/klassVtable.hpp" 55 #include "oops/metadata.hpp" 56 #include "oops/method.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/recordComponent.hpp" 59 #include "oops/symbol.hpp" 60 #include "prims/jvmtiExport.hpp" 61 #include "prims/jvmtiThreadState.hpp" 62 #include "runtime/arguments.hpp" 63 #include "runtime/handles.inline.hpp" 64 #include "runtime/javaCalls.hpp" 65 #include "runtime/os.hpp" 66 #include "runtime/perfData.hpp" 67 #include "runtime/reflection.hpp" 68 #include "runtime/safepointVerifiers.hpp" 69 #include "runtime/signature.hpp" 70 #include "runtime/timer.hpp" 71 #include "services/classLoadingService.hpp" 72 #include "services/threadService.hpp" 73 #include "utilities/align.hpp" 74 #include "utilities/bitMap.inline.hpp" 75 #include "utilities/copy.hpp" 76 #include "utilities/exceptions.hpp" 77 #include "utilities/globalDefinitions.hpp" 78 #include "utilities/growableArray.hpp" 79 #include "utilities/macros.hpp" 80 #include "utilities/ostream.hpp" 81 #include "utilities/resourceHash.hpp" 82 #include "utilities/utf8.hpp" 83 84 #if INCLUDE_CDS 85 #include "classfile/systemDictionaryShared.hpp" 86 #endif 87 #if INCLUDE_JFR 88 #include "jfr/support/jfrTraceIdExtension.hpp" 89 #endif 90 91 // We generally try to create the oops directly when parsing, rather than 92 // allocating temporary data structures and copying the bytes twice. A 93 // temporary area is only needed when parsing utf8 entries in the constant 94 // pool and when parsing line number tables. 95 96 // We add assert in debug mode when class format is not checked. 97 98 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 99 #define JAVA_MIN_SUPPORTED_VERSION 45 100 #define JAVA_PREVIEW_MINOR_VERSION 65535 101 102 // Used for two backward compatibility reasons: 103 // - to check for new additions to the class file format in JDK1.5 104 // - to check for bug fixes in the format checker in JDK1.5 105 #define JAVA_1_5_VERSION 49 106 107 // Used for backward compatibility reasons: 108 // - to check for javac bug fixes that happened after 1.5 109 // - also used as the max version when running in jdk6 110 #define JAVA_6_VERSION 50 111 112 // Used for backward compatibility reasons: 113 // - to disallow argument and require ACC_STATIC for <clinit> methods 114 #define JAVA_7_VERSION 51 115 116 // Extension method support. 117 #define JAVA_8_VERSION 52 118 119 #define JAVA_9_VERSION 53 120 121 #define JAVA_10_VERSION 54 122 123 #define JAVA_11_VERSION 55 124 125 #define JAVA_12_VERSION 56 126 127 #define JAVA_13_VERSION 57 128 129 #define JAVA_14_VERSION 58 130 131 #define JAVA_15_VERSION 59 132 133 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 134 assert((bad_constant == JVM_CONSTANT_Module || 135 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION, 136 "Unexpected bad constant pool entry"); 137 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 138 } 139 140 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 141 ConstantPool* cp, 142 const int length, 143 TRAPS) { 144 assert(stream != NULL, "invariant"); 145 assert(cp != NULL, "invariant"); 146 147 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 148 // this function (_current can be allocated in a register, with scalar 149 // replacement of aggregates). The _current pointer is copied back to 150 // stream() when this function returns. DON'T call another method within 151 // this method that uses stream(). 152 const ClassFileStream cfs1 = *stream; 153 const ClassFileStream* const cfs = &cfs1; 154 155 assert(cfs->allocated_on_stack(), "should be local"); 156 debug_only(const u1* const old_current = stream->current();) 157 158 // Used for batching symbol allocations. 159 const char* names[SymbolTable::symbol_alloc_batch_size]; 160 int lengths[SymbolTable::symbol_alloc_batch_size]; 161 int indices[SymbolTable::symbol_alloc_batch_size]; 162 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 163 int names_count = 0; 164 165 // parsing Index 0 is unused 166 for (int index = 1; index < length; index++) { 167 // Each of the following case guarantees one more byte in the stream 168 // for the following tag or the access_flags following constant pool, 169 // so we don't need bounds-check for reading tag. 170 const u1 tag = cfs->get_u1_fast(); 171 switch (tag) { 172 case JVM_CONSTANT_Class : { 173 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 174 const u2 name_index = cfs->get_u2_fast(); 175 cp->klass_index_at_put(index, name_index); 176 break; 177 } 178 case JVM_CONSTANT_Fieldref: { 179 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 180 const u2 class_index = cfs->get_u2_fast(); 181 const u2 name_and_type_index = cfs->get_u2_fast(); 182 cp->field_at_put(index, class_index, name_and_type_index); 183 break; 184 } 185 case JVM_CONSTANT_Methodref: { 186 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 187 const u2 class_index = cfs->get_u2_fast(); 188 const u2 name_and_type_index = cfs->get_u2_fast(); 189 cp->method_at_put(index, class_index, name_and_type_index); 190 break; 191 } 192 case JVM_CONSTANT_InterfaceMethodref: { 193 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 194 const u2 class_index = cfs->get_u2_fast(); 195 const u2 name_and_type_index = cfs->get_u2_fast(); 196 cp->interface_method_at_put(index, class_index, name_and_type_index); 197 break; 198 } 199 case JVM_CONSTANT_String : { 200 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 201 const u2 string_index = cfs->get_u2_fast(); 202 cp->string_index_at_put(index, string_index); 203 break; 204 } 205 case JVM_CONSTANT_MethodHandle : 206 case JVM_CONSTANT_MethodType: { 207 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 208 classfile_parse_error( 209 "Class file version does not support constant tag %u in class file %s", 210 tag, CHECK); 211 } 212 if (tag == JVM_CONSTANT_MethodHandle) { 213 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 214 const u1 ref_kind = cfs->get_u1_fast(); 215 const u2 method_index = cfs->get_u2_fast(); 216 cp->method_handle_index_at_put(index, ref_kind, method_index); 217 } 218 else if (tag == JVM_CONSTANT_MethodType) { 219 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 220 const u2 signature_index = cfs->get_u2_fast(); 221 cp->method_type_index_at_put(index, signature_index); 222 } 223 else { 224 ShouldNotReachHere(); 225 } 226 break; 227 } 228 case JVM_CONSTANT_Dynamic : { 229 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 230 classfile_parse_error( 231 "Class file version does not support constant tag %u in class file %s", 232 tag, CHECK); 233 } 234 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 235 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 236 const u2 name_and_type_index = cfs->get_u2_fast(); 237 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 238 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 239 } 240 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 241 break; 242 } 243 case JVM_CONSTANT_InvokeDynamic : { 244 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 245 classfile_parse_error( 246 "Class file version does not support constant tag %u in class file %s", 247 tag, CHECK); 248 } 249 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 250 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 251 const u2 name_and_type_index = cfs->get_u2_fast(); 252 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 253 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 254 } 255 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 256 break; 257 } 258 case JVM_CONSTANT_Integer: { 259 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 260 const u4 bytes = cfs->get_u4_fast(); 261 cp->int_at_put(index, (jint)bytes); 262 break; 263 } 264 case JVM_CONSTANT_Float: { 265 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 266 const u4 bytes = cfs->get_u4_fast(); 267 cp->float_at_put(index, *(jfloat*)&bytes); 268 break; 269 } 270 case JVM_CONSTANT_Long: { 271 // A mangled type might cause you to overrun allocated memory 272 guarantee_property(index + 1 < length, 273 "Invalid constant pool entry %u in class file %s", 274 index, 275 CHECK); 276 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 277 const u8 bytes = cfs->get_u8_fast(); 278 cp->long_at_put(index, bytes); 279 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 280 break; 281 } 282 case JVM_CONSTANT_Double: { 283 // A mangled type might cause you to overrun allocated memory 284 guarantee_property(index+1 < length, 285 "Invalid constant pool entry %u in class file %s", 286 index, 287 CHECK); 288 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 289 const u8 bytes = cfs->get_u8_fast(); 290 cp->double_at_put(index, *(jdouble*)&bytes); 291 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 292 break; 293 } 294 case JVM_CONSTANT_NameAndType: { 295 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 296 const u2 name_index = cfs->get_u2_fast(); 297 const u2 signature_index = cfs->get_u2_fast(); 298 cp->name_and_type_at_put(index, name_index, signature_index); 299 break; 300 } 301 case JVM_CONSTANT_Utf8 : { 302 cfs->guarantee_more(2, CHECK); // utf8_length 303 u2 utf8_length = cfs->get_u2_fast(); 304 const u1* utf8_buffer = cfs->current(); 305 assert(utf8_buffer != NULL, "null utf8 buffer"); 306 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 307 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 308 cfs->skip_u1_fast(utf8_length); 309 310 // Before storing the symbol, make sure it's legal 311 if (_need_verify) { 312 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 313 } 314 315 if (has_cp_patch_at(index)) { 316 Handle patch = clear_cp_patch_at(index); 317 guarantee_property(java_lang_String::is_instance(patch()), 318 "Illegal utf8 patch at %d in class file %s", 319 index, 320 CHECK); 321 const char* const str = java_lang_String::as_utf8_string(patch()); 322 // (could use java_lang_String::as_symbol instead, but might as well batch them) 323 utf8_buffer = (const u1*) str; 324 utf8_length = (u2) strlen(str); 325 } 326 327 unsigned int hash; 328 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 329 utf8_length, 330 hash); 331 if (result == NULL) { 332 names[names_count] = (const char*)utf8_buffer; 333 lengths[names_count] = utf8_length; 334 indices[names_count] = index; 335 hashValues[names_count++] = hash; 336 if (names_count == SymbolTable::symbol_alloc_batch_size) { 337 SymbolTable::new_symbols(_loader_data, 338 constantPoolHandle(THREAD, cp), 339 names_count, 340 names, 341 lengths, 342 indices, 343 hashValues); 344 names_count = 0; 345 } 346 } else { 347 cp->symbol_at_put(index, result); 348 } 349 break; 350 } 351 case JVM_CONSTANT_Module: 352 case JVM_CONSTANT_Package: { 353 // Record that an error occurred in these two cases but keep parsing so 354 // that ACC_Module can be checked for in the access_flags. Need to 355 // throw NoClassDefFoundError in that case. 356 if (_major_version >= JAVA_9_VERSION) { 357 cfs->guarantee_more(3, CHECK); 358 cfs->get_u2_fast(); 359 set_class_bad_constant_seen(tag); 360 break; 361 } 362 } 363 default: { 364 classfile_parse_error("Unknown constant tag %u in class file %s", 365 tag, 366 CHECK); 367 break; 368 } 369 } // end of switch(tag) 370 } // end of for 371 372 // Allocate the remaining symbols 373 if (names_count > 0) { 374 SymbolTable::new_symbols(_loader_data, 375 constantPoolHandle(THREAD, cp), 376 names_count, 377 names, 378 lengths, 379 indices, 380 hashValues); 381 } 382 383 // Copy _current pointer of local copy back to stream. 384 assert(stream->current() == old_current, "non-exclusive use of stream"); 385 stream->set_current(cfs1.current()); 386 387 } 388 389 static inline bool valid_cp_range(int index, int length) { 390 return (index > 0 && index < length); 391 } 392 393 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 394 assert(cp != NULL, "invariant"); 395 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 396 return cp->symbol_at(index); 397 } 398 return NULL; 399 } 400 401 #ifdef ASSERT 402 PRAGMA_DIAG_PUSH 403 PRAGMA_FORMAT_NONLITERAL_IGNORED 404 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 405 ResourceMark rm(THREAD); 406 fatal(msg, _class_name->as_C_string()); 407 } 408 409 void ClassFileParser::report_assert_property_failure(const char* msg, 410 int index, 411 TRAPS) const { 412 ResourceMark rm(THREAD); 413 fatal(msg, index, _class_name->as_C_string()); 414 } 415 PRAGMA_DIAG_POP 416 #endif 417 418 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 419 ConstantPool* const cp, 420 const int length, 421 TRAPS) { 422 assert(cp != NULL, "invariant"); 423 assert(stream != NULL, "invariant"); 424 425 // parsing constant pool entries 426 parse_constant_pool_entries(stream, cp, length, CHECK); 427 if (class_bad_constant_seen() != 0) { 428 // a bad CP entry has been detected previously so stop parsing and just return. 429 return; 430 } 431 432 int index = 1; // declared outside of loops for portability 433 int num_klasses = 0; 434 435 // first verification pass - validate cross references 436 // and fixup class and string constants 437 for (index = 1; index < length; index++) { // Index 0 is unused 438 const jbyte tag = cp->tag_at(index).value(); 439 switch (tag) { 440 case JVM_CONSTANT_Class: { 441 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 442 break; 443 } 444 case JVM_CONSTANT_Fieldref: 445 // fall through 446 case JVM_CONSTANT_Methodref: 447 // fall through 448 case JVM_CONSTANT_InterfaceMethodref: { 449 if (!_need_verify) break; 450 const int klass_ref_index = cp->klass_ref_index_at(index); 451 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 452 check_property(valid_klass_reference_at(klass_ref_index), 453 "Invalid constant pool index %u in class file %s", 454 klass_ref_index, CHECK); 455 check_property(valid_cp_range(name_and_type_ref_index, length) && 456 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 457 "Invalid constant pool index %u in class file %s", 458 name_and_type_ref_index, CHECK); 459 break; 460 } 461 case JVM_CONSTANT_String: { 462 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 463 break; 464 } 465 case JVM_CONSTANT_Integer: 466 break; 467 case JVM_CONSTANT_Float: 468 break; 469 case JVM_CONSTANT_Long: 470 case JVM_CONSTANT_Double: { 471 index++; 472 check_property( 473 (index < length && cp->tag_at(index).is_invalid()), 474 "Improper constant pool long/double index %u in class file %s", 475 index, CHECK); 476 break; 477 } 478 case JVM_CONSTANT_NameAndType: { 479 if (!_need_verify) break; 480 const int name_ref_index = cp->name_ref_index_at(index); 481 const int signature_ref_index = cp->signature_ref_index_at(index); 482 check_property(valid_symbol_at(name_ref_index), 483 "Invalid constant pool index %u in class file %s", 484 name_ref_index, CHECK); 485 check_property(valid_symbol_at(signature_ref_index), 486 "Invalid constant pool index %u in class file %s", 487 signature_ref_index, CHECK); 488 break; 489 } 490 case JVM_CONSTANT_Utf8: 491 break; 492 case JVM_CONSTANT_UnresolvedClass: // fall-through 493 case JVM_CONSTANT_UnresolvedClassInError: { 494 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 495 break; 496 } 497 case JVM_CONSTANT_ClassIndex: { 498 const int class_index = cp->klass_index_at(index); 499 check_property(valid_symbol_at(class_index), 500 "Invalid constant pool index %u in class file %s", 501 class_index, CHECK); 502 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 503 break; 504 } 505 case JVM_CONSTANT_StringIndex: { 506 const int string_index = cp->string_index_at(index); 507 check_property(valid_symbol_at(string_index), 508 "Invalid constant pool index %u in class file %s", 509 string_index, CHECK); 510 Symbol* const sym = cp->symbol_at(string_index); 511 cp->unresolved_string_at_put(index, sym); 512 break; 513 } 514 case JVM_CONSTANT_MethodHandle: { 515 const int ref_index = cp->method_handle_index_at(index); 516 check_property(valid_cp_range(ref_index, length), 517 "Invalid constant pool index %u in class file %s", 518 ref_index, CHECK); 519 const constantTag tag = cp->tag_at(ref_index); 520 const int ref_kind = cp->method_handle_ref_kind_at(index); 521 522 switch (ref_kind) { 523 case JVM_REF_getField: 524 case JVM_REF_getStatic: 525 case JVM_REF_putField: 526 case JVM_REF_putStatic: { 527 check_property( 528 tag.is_field(), 529 "Invalid constant pool index %u in class file %s (not a field)", 530 ref_index, CHECK); 531 break; 532 } 533 case JVM_REF_invokeVirtual: 534 case JVM_REF_newInvokeSpecial: { 535 check_property( 536 tag.is_method(), 537 "Invalid constant pool index %u in class file %s (not a method)", 538 ref_index, CHECK); 539 break; 540 } 541 case JVM_REF_invokeStatic: 542 case JVM_REF_invokeSpecial: { 543 check_property( 544 tag.is_method() || 545 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 546 "Invalid constant pool index %u in class file %s (not a method)", 547 ref_index, CHECK); 548 break; 549 } 550 case JVM_REF_invokeInterface: { 551 check_property( 552 tag.is_interface_method(), 553 "Invalid constant pool index %u in class file %s (not an interface method)", 554 ref_index, CHECK); 555 break; 556 } 557 default: { 558 classfile_parse_error( 559 "Bad method handle kind at constant pool index %u in class file %s", 560 index, CHECK); 561 } 562 } // switch(refkind) 563 // Keep the ref_index unchanged. It will be indirected at link-time. 564 break; 565 } // case MethodHandle 566 case JVM_CONSTANT_MethodType: { 567 const int ref_index = cp->method_type_index_at(index); 568 check_property(valid_symbol_at(ref_index), 569 "Invalid constant pool index %u in class file %s", 570 ref_index, CHECK); 571 break; 572 } 573 case JVM_CONSTANT_Dynamic: { 574 const int name_and_type_ref_index = 575 cp->bootstrap_name_and_type_ref_index_at(index); 576 577 check_property(valid_cp_range(name_and_type_ref_index, length) && 578 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 579 "Invalid constant pool index %u in class file %s", 580 name_and_type_ref_index, CHECK); 581 // bootstrap specifier index must be checked later, 582 // when BootstrapMethods attr is available 583 584 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 585 cp->set_has_dynamic_constant(); 586 break; 587 } 588 case JVM_CONSTANT_InvokeDynamic: { 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 break; 599 } 600 default: { 601 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 602 ShouldNotReachHere(); 603 break; 604 } 605 } // switch(tag) 606 } // end of for 607 608 _first_patched_klass_resolved_index = num_klasses; 609 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 610 611 if (_cp_patches != NULL) { 612 // need to treat this_class specially... 613 614 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 615 // for now. These will be replaced with actual names of the patched classes in patch_class(). 616 Symbol* s = vmSymbols::star_name(); 617 for (int n=_orig_cp_size; n<cp->length(); n++) { 618 cp->symbol_at_put(n, s); 619 } 620 621 int this_class_index; 622 { 623 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 624 const u1* const mark = stream->current(); 625 stream->skip_u2_fast(1); // skip flags 626 this_class_index = stream->get_u2_fast(); 627 stream->set_current(mark); // revert to mark 628 } 629 630 for (index = 1; index < length; index++) { // Index 0 is unused 631 if (has_cp_patch_at(index)) { 632 guarantee_property(index != this_class_index, 633 "Illegal constant pool patch to self at %d in class file %s", 634 index, CHECK); 635 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 636 } 637 } 638 } 639 640 if (!_need_verify) { 641 return; 642 } 643 644 // second verification pass - checks the strings are of the right format. 645 // but not yet to the other entries 646 for (index = 1; index < length; index++) { 647 const jbyte tag = cp->tag_at(index).value(); 648 switch (tag) { 649 case JVM_CONSTANT_UnresolvedClass: { 650 const Symbol* const class_name = cp->klass_name_at(index); 651 // check the name, even if _cp_patches will overwrite it 652 verify_legal_class_name(class_name, CHECK); 653 break; 654 } 655 case JVM_CONSTANT_NameAndType: { 656 if (_need_verify) { 657 const int sig_index = cp->signature_ref_index_at(index); 658 const int name_index = cp->name_ref_index_at(index); 659 const Symbol* const name = cp->symbol_at(name_index); 660 const Symbol* const sig = cp->symbol_at(sig_index); 661 guarantee_property(sig->utf8_length() != 0, 662 "Illegal zero length constant pool entry at %d in class %s", 663 sig_index, CHECK); 664 guarantee_property(name->utf8_length() != 0, 665 "Illegal zero length constant pool entry at %d in class %s", 666 name_index, CHECK); 667 668 if (Signature::is_method(sig)) { 669 // Format check method name and signature 670 verify_legal_method_name(name, CHECK); 671 verify_legal_method_signature(name, sig, CHECK); 672 } else { 673 // Format check field name and signature 674 verify_legal_field_name(name, CHECK); 675 verify_legal_field_signature(name, sig, CHECK); 676 } 677 } 678 break; 679 } 680 case JVM_CONSTANT_Dynamic: { 681 const int name_and_type_ref_index = 682 cp->name_and_type_ref_index_at(index); 683 // already verified to be utf8 684 const int name_ref_index = 685 cp->name_ref_index_at(name_and_type_ref_index); 686 // already verified to be utf8 687 const int signature_ref_index = 688 cp->signature_ref_index_at(name_and_type_ref_index); 689 const Symbol* const name = cp->symbol_at(name_ref_index); 690 const Symbol* const signature = cp->symbol_at(signature_ref_index); 691 if (_need_verify) { 692 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 693 // Need only to be sure signature is the right type. 694 if (Signature::is_method(signature)) { 695 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 696 } 697 } 698 break; 699 } 700 case JVM_CONSTANT_InvokeDynamic: 701 case JVM_CONSTANT_Fieldref: 702 case JVM_CONSTANT_Methodref: 703 case JVM_CONSTANT_InterfaceMethodref: { 704 const int name_and_type_ref_index = 705 cp->name_and_type_ref_index_at(index); 706 // already verified to be utf8 707 const int name_ref_index = 708 cp->name_ref_index_at(name_and_type_ref_index); 709 // already verified to be utf8 710 const int signature_ref_index = 711 cp->signature_ref_index_at(name_and_type_ref_index); 712 const Symbol* const name = cp->symbol_at(name_ref_index); 713 const Symbol* const signature = cp->symbol_at(signature_ref_index); 714 if (tag == JVM_CONSTANT_Fieldref) { 715 if (_need_verify) { 716 // Field name and signature are verified above, when iterating NameAndType_info. 717 // Need only to be sure signature is non-zero length and the right type. 718 if (Signature::is_method(signature)) { 719 throwIllegalSignature("Field", name, signature, CHECK); 720 } 721 } 722 } else { 723 if (_need_verify) { 724 // Method name and signature are verified above, when iterating NameAndType_info. 725 // Need only to be sure signature is non-zero length and the right type. 726 if (!Signature::is_method(signature)) { 727 throwIllegalSignature("Method", name, signature, CHECK); 728 } 729 } 730 // 4509014: If a class method name begins with '<', it must be "<init>" 731 const unsigned int name_len = name->utf8_length(); 732 if (tag == JVM_CONSTANT_Methodref && 733 name_len != 0 && 734 name->char_at(0) == JVM_SIGNATURE_SPECIAL && 735 name != vmSymbols::object_initializer_name()) { 736 classfile_parse_error( 737 "Bad method name at constant pool index %u in class file %s", 738 name_ref_index, CHECK); 739 } 740 } 741 break; 742 } 743 case JVM_CONSTANT_MethodHandle: { 744 const int ref_index = cp->method_handle_index_at(index); 745 const int ref_kind = cp->method_handle_ref_kind_at(index); 746 switch (ref_kind) { 747 case JVM_REF_invokeVirtual: 748 case JVM_REF_invokeStatic: 749 case JVM_REF_invokeSpecial: 750 case JVM_REF_newInvokeSpecial: { 751 const int name_and_type_ref_index = 752 cp->name_and_type_ref_index_at(ref_index); 753 const int name_ref_index = 754 cp->name_ref_index_at(name_and_type_ref_index); 755 const Symbol* const name = cp->symbol_at(name_ref_index); 756 if (ref_kind == JVM_REF_newInvokeSpecial) { 757 if (name != vmSymbols::object_initializer_name()) { 758 classfile_parse_error( 759 "Bad constructor name at constant pool index %u in class file %s", 760 name_ref_index, CHECK); 761 } 762 } else { 763 if (name == vmSymbols::object_initializer_name()) { 764 classfile_parse_error( 765 "Bad method name at constant pool index %u in class file %s", 766 name_ref_index, CHECK); 767 } 768 } 769 break; 770 } 771 // Other ref_kinds are already fully checked in previous pass. 772 } // switch(ref_kind) 773 break; 774 } 775 case JVM_CONSTANT_MethodType: { 776 const Symbol* const no_name = vmSymbols::type_name(); // place holder 777 const Symbol* const signature = cp->method_type_signature_at(index); 778 verify_legal_method_signature(no_name, signature, CHECK); 779 break; 780 } 781 case JVM_CONSTANT_Utf8: { 782 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 783 } 784 } // switch(tag) 785 } // end of for 786 } 787 788 Handle ClassFileParser::clear_cp_patch_at(int index) { 789 Handle patch = cp_patch_at(index); 790 _cp_patches->at_put(index, Handle()); 791 assert(!has_cp_patch_at(index), ""); 792 return patch; 793 } 794 795 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) { 796 int name_index = _orig_cp_size + _num_patched_klasses; 797 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses; 798 799 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name); 800 _num_patched_klasses ++; 801 } 802 803 void ClassFileParser::patch_constant_pool(ConstantPool* cp, 804 int index, 805 Handle patch, 806 TRAPS) { 807 assert(cp != NULL, "invariant"); 808 809 BasicType patch_type = T_VOID; 810 811 switch (cp->tag_at(index).value()) { 812 813 case JVM_CONSTANT_UnresolvedClass: { 814 // Patching a class means pre-resolving it. 815 // The name in the constant pool is ignored. 816 if (java_lang_Class::is_instance(patch())) { 817 guarantee_property(!java_lang_Class::is_primitive(patch()), 818 "Illegal class patch at %d in class file %s", 819 index, CHECK); 820 Klass* k = java_lang_Class::as_Klass(patch()); 821 patch_class(cp, index, k, k->name()); 822 } else { 823 guarantee_property(java_lang_String::is_instance(patch()), 824 "Illegal class patch at %d in class file %s", 825 index, CHECK); 826 Symbol* const name = java_lang_String::as_symbol(patch()); 827 patch_class(cp, index, NULL, name); 828 } 829 break; 830 } 831 832 case JVM_CONSTANT_String: { 833 // skip this patch and don't clear it. Needs the oop array for resolved 834 // references to be created first. 835 return; 836 } 837 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 838 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 839 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 840 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 841 patch_prim: 842 { 843 jvalue value; 844 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 845 guarantee_property(value_type == patch_type, 846 "Illegal primitive patch at %d in class file %s", 847 index, CHECK); 848 switch (value_type) { 849 case T_INT: cp->int_at_put(index, value.i); break; 850 case T_FLOAT: cp->float_at_put(index, value.f); break; 851 case T_LONG: cp->long_at_put(index, value.j); break; 852 case T_DOUBLE: cp->double_at_put(index, value.d); break; 853 default: assert(false, ""); 854 } 855 } // end patch_prim label 856 break; 857 858 default: { 859 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 860 guarantee_property(!has_cp_patch_at(index), 861 "Illegal unexpected patch at %d in class file %s", 862 index, CHECK); 863 return; 864 } 865 } // end of switch(tag) 866 867 // On fall-through, mark the patch as used. 868 clear_cp_patch_at(index); 869 } 870 class NameSigHash: public ResourceObj { 871 public: 872 const Symbol* _name; // name 873 const Symbol* _sig; // signature 874 NameSigHash* _next; // Next entry in hash table 875 }; 876 877 static const int HASH_ROW_SIZE = 256; 878 879 static unsigned int hash(const Symbol* name, const Symbol* sig) { 880 unsigned int raw_hash = 0; 881 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 882 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 883 884 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 885 } 886 887 888 static void initialize_hashtable(NameSigHash** table) { 889 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 890 } 891 // Return false if the name/sig combination is found in table. 892 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 893 // The old format checker uses heap sort to find duplicates. 894 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 895 // of table since we don't expect Symbol*'s to move. 896 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 897 assert(name != NULL, "name in constant pool is NULL"); 898 899 // First lookup for duplicates 900 int index = hash(name, sig); 901 NameSigHash* entry = table[index]; 902 while (entry != NULL) { 903 if (entry->_name == name && entry->_sig == sig) { 904 return false; 905 } 906 entry = entry->_next; 907 } 908 909 // No duplicate is found, allocate a new entry and fill it. 910 entry = new NameSigHash(); 911 entry->_name = name; 912 entry->_sig = sig; 913 914 // Insert into hash table 915 entry->_next = table[index]; 916 table[index] = entry; 917 918 return true; 919 } 920 921 // Side-effects: populates the _local_interfaces field 922 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 923 const int itfs_len, 924 ConstantPool* const cp, 925 bool* const has_nonstatic_concrete_methods, 926 TRAPS) { 927 assert(stream != NULL, "invariant"); 928 assert(cp != NULL, "invariant"); 929 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 930 931 if (itfs_len == 0) { 932 _local_interfaces = Universe::the_empty_instance_klass_array(); 933 } else { 934 assert(itfs_len > 0, "only called for len>0"); 935 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK); 936 937 int index; 938 for (index = 0; index < itfs_len; index++) { 939 const u2 interface_index = stream->get_u2(CHECK); 940 Klass* interf; 941 check_property( 942 valid_klass_reference_at(interface_index), 943 "Interface name has bad constant pool index %u in class file %s", 944 interface_index, CHECK); 945 if (cp->tag_at(interface_index).is_klass()) { 946 interf = cp->resolved_klass_at(interface_index); 947 } else { 948 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 949 950 // Don't need to check legal name because it's checked when parsing constant pool. 951 // But need to make sure it's not an array type. 952 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 953 "Bad interface name in class file %s", CHECK); 954 955 // Call resolve_super so classcircularity is checked 956 interf = SystemDictionary::resolve_super_or_fail( 957 _class_name, 958 unresolved_klass, 959 Handle(THREAD, _loader_data->class_loader()), 960 _protection_domain, 961 false, 962 CHECK); 963 } 964 965 if (!interf->is_interface()) { 966 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 967 err_msg("class %s can not implement %s, because it is not an interface (%s)", 968 _class_name->as_klass_external_name(), 969 interf->external_name(), 970 interf->class_in_module_of_loader())); 971 } 972 973 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 974 *has_nonstatic_concrete_methods = true; 975 } 976 _local_interfaces->at_put(index, InstanceKlass::cast(interf)); 977 } 978 979 if (!_need_verify || itfs_len <= 1) { 980 return; 981 } 982 983 // Check if there's any duplicates in interfaces 984 ResourceMark rm(THREAD); 985 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 986 NameSigHash*, 987 HASH_ROW_SIZE); 988 initialize_hashtable(interface_names); 989 bool dup = false; 990 const Symbol* name = NULL; 991 { 992 debug_only(NoSafepointVerifier nsv;) 993 for (index = 0; index < itfs_len; index++) { 994 const InstanceKlass* const k = _local_interfaces->at(index); 995 name = k->name(); 996 // If no duplicates, add (name, NULL) in hashtable interface_names. 997 if (!put_after_lookup(name, NULL, interface_names)) { 998 dup = true; 999 break; 1000 } 1001 } 1002 } 1003 if (dup) { 1004 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 1005 name->as_C_string(), CHECK); 1006 } 1007 } 1008 } 1009 1010 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1011 int constantvalue_index, 1012 int signature_index, 1013 TRAPS) const { 1014 // Make sure the constant pool entry is of a type appropriate to this field 1015 guarantee_property( 1016 (constantvalue_index > 0 && 1017 constantvalue_index < cp->length()), 1018 "Bad initial value index %u in ConstantValue attribute in class file %s", 1019 constantvalue_index, CHECK); 1020 1021 const constantTag value_type = cp->tag_at(constantvalue_index); 1022 switch(cp->basic_type_for_signature_at(signature_index)) { 1023 case T_LONG: { 1024 guarantee_property(value_type.is_long(), 1025 "Inconsistent constant value type in class file %s", 1026 CHECK); 1027 break; 1028 } 1029 case T_FLOAT: { 1030 guarantee_property(value_type.is_float(), 1031 "Inconsistent constant value type in class file %s", 1032 CHECK); 1033 break; 1034 } 1035 case T_DOUBLE: { 1036 guarantee_property(value_type.is_double(), 1037 "Inconsistent constant value type in class file %s", 1038 CHECK); 1039 break; 1040 } 1041 case T_BYTE: 1042 case T_CHAR: 1043 case T_SHORT: 1044 case T_BOOLEAN: 1045 case T_INT: { 1046 guarantee_property(value_type.is_int(), 1047 "Inconsistent constant value type in class file %s", 1048 CHECK); 1049 break; 1050 } 1051 case T_OBJECT: { 1052 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1053 && value_type.is_string()), 1054 "Bad string initial value in class file %s", 1055 CHECK); 1056 break; 1057 } 1058 default: { 1059 classfile_parse_error("Unable to set initial value %u in class file %s", 1060 constantvalue_index, 1061 CHECK); 1062 } 1063 } 1064 } 1065 1066 class AnnotationCollector : public ResourceObj{ 1067 public: 1068 enum Location { _in_field, _in_method, _in_class }; 1069 enum ID { 1070 _unknown = 0, 1071 _method_CallerSensitive, 1072 _method_ForceInline, 1073 _method_DontInline, 1074 _method_InjectedProfile, 1075 _method_LambdaForm_Compiled, 1076 _method_Hidden, 1077 _method_HotSpotIntrinsicCandidate, 1078 _jdk_internal_vm_annotation_Contended, 1079 _field_Stable, 1080 _jdk_internal_vm_annotation_ReservedStackAccess, 1081 _annotation_LIMIT 1082 }; 1083 const Location _location; 1084 int _annotations_present; 1085 u2 _contended_group; 1086 1087 AnnotationCollector(Location location) 1088 : _location(location), _annotations_present(0) 1089 { 1090 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1091 } 1092 // If this annotation name has an ID, report it (or _none). 1093 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 1094 // Set the annotation name: 1095 void set_annotation(ID id) { 1096 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1097 _annotations_present |= nth_bit((int)id); 1098 } 1099 1100 void remove_annotation(ID id) { 1101 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1102 _annotations_present &= ~nth_bit((int)id); 1103 } 1104 1105 // Report if the annotation is present. 1106 bool has_any_annotations() const { return _annotations_present != 0; } 1107 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1108 1109 void set_contended_group(u2 group) { _contended_group = group; } 1110 u2 contended_group() const { return _contended_group; } 1111 1112 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1113 1114 void set_stable(bool stable) { set_annotation(_field_Stable); } 1115 bool is_stable() const { return has_annotation(_field_Stable); } 1116 }; 1117 1118 // This class also doubles as a holder for metadata cleanup. 1119 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1120 private: 1121 ClassLoaderData* _loader_data; 1122 AnnotationArray* _field_annotations; 1123 AnnotationArray* _field_type_annotations; 1124 public: 1125 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1126 AnnotationCollector(_in_field), 1127 _loader_data(loader_data), 1128 _field_annotations(NULL), 1129 _field_type_annotations(NULL) {} 1130 ~FieldAnnotationCollector(); 1131 void apply_to(FieldInfo* f); 1132 AnnotationArray* field_annotations() { return _field_annotations; } 1133 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1134 1135 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1136 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1137 }; 1138 1139 class MethodAnnotationCollector : public AnnotationCollector{ 1140 public: 1141 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1142 void apply_to(const methodHandle& m); 1143 }; 1144 1145 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1146 public: 1147 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1148 void apply_to(InstanceKlass* ik); 1149 }; 1150 1151 1152 static int skip_annotation_value(const u1*, int, int); // fwd decl 1153 1154 // Safely increment index by val if does not pass limit 1155 #define SAFE_ADD(index, limit, val) \ 1156 if (index >= limit - val) return limit; \ 1157 index += val; 1158 1159 // Skip an annotation. Return >=limit if there is any problem. 1160 static int skip_annotation(const u1* buffer, int limit, int index) { 1161 assert(buffer != NULL, "invariant"); 1162 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1163 // value := switch (tag:u1) { ... } 1164 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1165 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1166 while (--nmem >= 0 && index < limit) { 1167 SAFE_ADD(index, limit, 2); // skip member 1168 index = skip_annotation_value(buffer, limit, index); 1169 } 1170 return index; 1171 } 1172 1173 // Skip an annotation value. Return >=limit if there is any problem. 1174 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1175 assert(buffer != NULL, "invariant"); 1176 1177 // value := switch (tag:u1) { 1178 // case B, C, I, S, Z, D, F, J, c: con:u2; 1179 // case e: e_class:u2 e_name:u2; 1180 // case s: s_con:u2; 1181 // case [: do(nval:u2) {value}; 1182 // case @: annotation; 1183 // case s: s_con:u2; 1184 // } 1185 SAFE_ADD(index, limit, 1); // read tag 1186 const u1 tag = buffer[index - 1]; 1187 switch (tag) { 1188 case 'B': 1189 case 'C': 1190 case 'I': 1191 case 'S': 1192 case 'Z': 1193 case 'D': 1194 case 'F': 1195 case 'J': 1196 case 'c': 1197 case 's': 1198 SAFE_ADD(index, limit, 2); // skip con or s_con 1199 break; 1200 case 'e': 1201 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1202 break; 1203 case '[': 1204 { 1205 SAFE_ADD(index, limit, 2); // read nval 1206 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1207 while (--nval >= 0 && index < limit) { 1208 index = skip_annotation_value(buffer, limit, index); 1209 } 1210 } 1211 break; 1212 case '@': 1213 index = skip_annotation(buffer, limit, index); 1214 break; 1215 default: 1216 return limit; // bad tag byte 1217 } 1218 return index; 1219 } 1220 1221 // Sift through annotations, looking for those significant to the VM: 1222 static void parse_annotations(const ConstantPool* const cp, 1223 const u1* buffer, int limit, 1224 AnnotationCollector* coll, 1225 ClassLoaderData* loader_data, 1226 TRAPS) { 1227 1228 assert(cp != NULL, "invariant"); 1229 assert(buffer != NULL, "invariant"); 1230 assert(coll != NULL, "invariant"); 1231 assert(loader_data != NULL, "invariant"); 1232 1233 // annotations := do(nann:u2) {annotation} 1234 int index = 2; // read nann 1235 if (index >= limit) return; 1236 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1237 enum { // initial annotation layout 1238 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1239 count_off = 2, // u2 such as 1 (one value) 1240 member_off = 4, // utf8 such as 'value' 1241 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1242 e_tag_val = 'e', 1243 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1244 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1245 e_size = 11, // end of 'e' annotation 1246 c_tag_val = 'c', // payload is type 1247 c_con_off = 7, // utf8 payload, such as 'I' 1248 c_size = 9, // end of 'c' annotation 1249 s_tag_val = 's', // payload is String 1250 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1251 s_size = 9, 1252 min_size = 6 // smallest possible size (zero members) 1253 }; 1254 // Cannot add min_size to index in case of overflow MAX_INT 1255 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1256 int index0 = index; 1257 index = skip_annotation(buffer, limit, index); 1258 const u1* const abase = buffer + index0; 1259 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1260 const int count = Bytes::get_Java_u2((address)abase + count_off); 1261 const Symbol* const aname = check_symbol_at(cp, atype); 1262 if (aname == NULL) break; // invalid annotation name 1263 const Symbol* member = NULL; 1264 if (count >= 1) { 1265 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1266 member = check_symbol_at(cp, member_index); 1267 if (member == NULL) break; // invalid member name 1268 } 1269 1270 // Here is where parsing particular annotations will take place. 1271 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1272 if (AnnotationCollector::_unknown == id) continue; 1273 coll->set_annotation(id); 1274 1275 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1276 // @Contended can optionally specify the contention group. 1277 // 1278 // Contended group defines the equivalence class over the fields: 1279 // the fields within the same contended group are not treated distinct. 1280 // The only exception is default group, which does not incur the 1281 // equivalence. Naturally, contention group for classes is meaningless. 1282 // 1283 // While the contention group is specified as String, annotation 1284 // values are already interned, and we might as well use the constant 1285 // pool index as the group tag. 1286 // 1287 u2 group_index = 0; // default contended group 1288 if (count == 1 1289 && s_size == (index - index0) // match size 1290 && s_tag_val == *(abase + tag_off) 1291 && member == vmSymbols::value_name()) { 1292 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1293 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1294 group_index = 0; // default contended group 1295 } 1296 } 1297 coll->set_contended_group(group_index); 1298 } 1299 } 1300 } 1301 1302 1303 // Parse attributes for a field. 1304 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1305 u2 attributes_count, 1306 bool is_static, u2 signature_index, 1307 u2* const constantvalue_index_addr, 1308 bool* const is_synthetic_addr, 1309 u2* const generic_signature_index_addr, 1310 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1311 TRAPS) { 1312 assert(cfs != NULL, "invariant"); 1313 assert(constantvalue_index_addr != NULL, "invariant"); 1314 assert(is_synthetic_addr != NULL, "invariant"); 1315 assert(generic_signature_index_addr != NULL, "invariant"); 1316 assert(parsed_annotations != NULL, "invariant"); 1317 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1318 1319 u2 constantvalue_index = 0; 1320 u2 generic_signature_index = 0; 1321 bool is_synthetic = false; 1322 const u1* runtime_visible_annotations = NULL; 1323 int runtime_visible_annotations_length = 0; 1324 const u1* runtime_invisible_annotations = NULL; 1325 int runtime_invisible_annotations_length = 0; 1326 const u1* runtime_visible_type_annotations = NULL; 1327 int runtime_visible_type_annotations_length = 0; 1328 const u1* runtime_invisible_type_annotations = NULL; 1329 int runtime_invisible_type_annotations_length = 0; 1330 bool runtime_invisible_annotations_exists = false; 1331 bool runtime_invisible_type_annotations_exists = false; 1332 const ConstantPool* const cp = _cp; 1333 1334 while (attributes_count--) { 1335 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1336 const u2 attribute_name_index = cfs->get_u2_fast(); 1337 const u4 attribute_length = cfs->get_u4_fast(); 1338 check_property(valid_symbol_at(attribute_name_index), 1339 "Invalid field attribute index %u in class file %s", 1340 attribute_name_index, 1341 CHECK); 1342 1343 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1344 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1345 // ignore if non-static 1346 if (constantvalue_index != 0) { 1347 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1348 } 1349 check_property( 1350 attribute_length == 2, 1351 "Invalid ConstantValue field attribute length %u in class file %s", 1352 attribute_length, CHECK); 1353 1354 constantvalue_index = cfs->get_u2(CHECK); 1355 if (_need_verify) { 1356 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1357 } 1358 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1359 if (attribute_length != 0) { 1360 classfile_parse_error( 1361 "Invalid Synthetic field attribute length %u in class file %s", 1362 attribute_length, CHECK); 1363 } 1364 is_synthetic = true; 1365 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1366 if (attribute_length != 0) { 1367 classfile_parse_error( 1368 "Invalid Deprecated field attribute length %u in class file %s", 1369 attribute_length, CHECK); 1370 } 1371 } else if (_major_version >= JAVA_1_5_VERSION) { 1372 if (attribute_name == vmSymbols::tag_signature()) { 1373 if (generic_signature_index != 0) { 1374 classfile_parse_error( 1375 "Multiple Signature attributes for field in class file %s", CHECK); 1376 } 1377 if (attribute_length != 2) { 1378 classfile_parse_error( 1379 "Wrong size %u for field's Signature attribute in class file %s", 1380 attribute_length, CHECK); 1381 } 1382 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1383 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1384 if (runtime_visible_annotations != NULL) { 1385 classfile_parse_error( 1386 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1387 } 1388 runtime_visible_annotations_length = attribute_length; 1389 runtime_visible_annotations = cfs->current(); 1390 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1391 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1392 parse_annotations(cp, 1393 runtime_visible_annotations, 1394 runtime_visible_annotations_length, 1395 parsed_annotations, 1396 _loader_data, 1397 CHECK); 1398 cfs->skip_u1_fast(runtime_visible_annotations_length); 1399 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1400 if (runtime_invisible_annotations_exists) { 1401 classfile_parse_error( 1402 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1403 } 1404 runtime_invisible_annotations_exists = true; 1405 if (PreserveAllAnnotations) { 1406 runtime_invisible_annotations_length = attribute_length; 1407 runtime_invisible_annotations = cfs->current(); 1408 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1409 } 1410 cfs->skip_u1(attribute_length, CHECK); 1411 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1412 if (runtime_visible_type_annotations != NULL) { 1413 classfile_parse_error( 1414 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1415 } 1416 runtime_visible_type_annotations_length = attribute_length; 1417 runtime_visible_type_annotations = cfs->current(); 1418 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1419 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1420 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1421 if (runtime_invisible_type_annotations_exists) { 1422 classfile_parse_error( 1423 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1424 } else { 1425 runtime_invisible_type_annotations_exists = true; 1426 } 1427 if (PreserveAllAnnotations) { 1428 runtime_invisible_type_annotations_length = attribute_length; 1429 runtime_invisible_type_annotations = cfs->current(); 1430 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1431 } 1432 cfs->skip_u1(attribute_length, CHECK); 1433 } else { 1434 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1435 } 1436 } else { 1437 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1438 } 1439 } 1440 1441 *constantvalue_index_addr = constantvalue_index; 1442 *is_synthetic_addr = is_synthetic; 1443 *generic_signature_index_addr = generic_signature_index; 1444 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1445 runtime_visible_annotations_length, 1446 runtime_invisible_annotations, 1447 runtime_invisible_annotations_length, 1448 CHECK); 1449 parsed_annotations->set_field_annotations(a); 1450 a = assemble_annotations(runtime_visible_type_annotations, 1451 runtime_visible_type_annotations_length, 1452 runtime_invisible_type_annotations, 1453 runtime_invisible_type_annotations_length, 1454 CHECK); 1455 parsed_annotations->set_field_type_annotations(a); 1456 return; 1457 } 1458 1459 1460 // Field allocation types. Used for computing field offsets. 1461 1462 enum FieldAllocationType { 1463 STATIC_OOP, // Oops 1464 STATIC_BYTE, // Boolean, Byte, char 1465 STATIC_SHORT, // shorts 1466 STATIC_WORD, // ints 1467 STATIC_DOUBLE, // aligned long or double 1468 NONSTATIC_OOP, 1469 NONSTATIC_BYTE, 1470 NONSTATIC_SHORT, 1471 NONSTATIC_WORD, 1472 NONSTATIC_DOUBLE, 1473 MAX_FIELD_ALLOCATION_TYPE, 1474 BAD_ALLOCATION_TYPE = -1 1475 }; 1476 1477 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1478 BAD_ALLOCATION_TYPE, // 0 1479 BAD_ALLOCATION_TYPE, // 1 1480 BAD_ALLOCATION_TYPE, // 2 1481 BAD_ALLOCATION_TYPE, // 3 1482 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1483 NONSTATIC_SHORT, // T_CHAR = 5, 1484 NONSTATIC_WORD, // T_FLOAT = 6, 1485 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1486 NONSTATIC_BYTE, // T_BYTE = 8, 1487 NONSTATIC_SHORT, // T_SHORT = 9, 1488 NONSTATIC_WORD, // T_INT = 10, 1489 NONSTATIC_DOUBLE, // T_LONG = 11, 1490 NONSTATIC_OOP, // T_OBJECT = 12, 1491 NONSTATIC_OOP, // T_ARRAY = 13, 1492 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1493 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1494 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1495 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1496 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1497 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1498 BAD_ALLOCATION_TYPE, // 0 1499 BAD_ALLOCATION_TYPE, // 1 1500 BAD_ALLOCATION_TYPE, // 2 1501 BAD_ALLOCATION_TYPE, // 3 1502 STATIC_BYTE , // T_BOOLEAN = 4, 1503 STATIC_SHORT, // T_CHAR = 5, 1504 STATIC_WORD, // T_FLOAT = 6, 1505 STATIC_DOUBLE, // T_DOUBLE = 7, 1506 STATIC_BYTE, // T_BYTE = 8, 1507 STATIC_SHORT, // T_SHORT = 9, 1508 STATIC_WORD, // T_INT = 10, 1509 STATIC_DOUBLE, // T_LONG = 11, 1510 STATIC_OOP, // T_OBJECT = 12, 1511 STATIC_OOP, // T_ARRAY = 13, 1512 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1513 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1514 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1515 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1516 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1517 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1518 }; 1519 1520 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1521 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1522 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1523 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1524 return result; 1525 } 1526 1527 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1528 public: 1529 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1530 1531 FieldAllocationCount() { 1532 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1533 count[i] = 0; 1534 } 1535 } 1536 1537 FieldAllocationType update(bool is_static, BasicType type) { 1538 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1539 if (atype != BAD_ALLOCATION_TYPE) { 1540 // Make sure there is no overflow with injected fields. 1541 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1542 count[atype]++; 1543 } 1544 return atype; 1545 } 1546 }; 1547 1548 // Side-effects: populates the _fields, _fields_annotations, 1549 // _fields_type_annotations fields 1550 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1551 bool is_interface, 1552 FieldAllocationCount* const fac, 1553 ConstantPool* cp, 1554 const int cp_size, 1555 u2* const java_fields_count_ptr, 1556 TRAPS) { 1557 1558 assert(cfs != NULL, "invariant"); 1559 assert(fac != NULL, "invariant"); 1560 assert(cp != NULL, "invariant"); 1561 assert(java_fields_count_ptr != NULL, "invariant"); 1562 1563 assert(NULL == _fields, "invariant"); 1564 assert(NULL == _fields_annotations, "invariant"); 1565 assert(NULL == _fields_type_annotations, "invariant"); 1566 1567 cfs->guarantee_more(2, CHECK); // length 1568 const u2 length = cfs->get_u2_fast(); 1569 *java_fields_count_ptr = length; 1570 1571 int num_injected = 0; 1572 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1573 &num_injected); 1574 const int total_fields = length + num_injected; 1575 1576 // The field array starts with tuples of shorts 1577 // [access, name index, sig index, initial value index, byte offset]. 1578 // A generic signature slot only exists for field with generic 1579 // signature attribute. And the access flag is set with 1580 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1581 // signature slots are at the end of the field array and after all 1582 // other fields data. 1583 // 1584 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1585 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1586 // ... 1587 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1588 // [generic signature index] 1589 // [generic signature index] 1590 // ... 1591 // 1592 // Allocate a temporary resource array for field data. For each field, 1593 // a slot is reserved in the temporary array for the generic signature 1594 // index. After parsing all fields, the data are copied to a permanent 1595 // array and any unused slots will be discarded. 1596 ResourceMark rm(THREAD); 1597 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1598 u2, 1599 total_fields * (FieldInfo::field_slots + 1)); 1600 1601 // The generic signature slots start after all other fields' data. 1602 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1603 int num_generic_signature = 0; 1604 for (int n = 0; n < length; n++) { 1605 // access_flags, name_index, descriptor_index, attributes_count 1606 cfs->guarantee_more(8, CHECK); 1607 1608 AccessFlags access_flags; 1609 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1610 verify_legal_field_modifiers(flags, is_interface, CHECK); 1611 access_flags.set_flags(flags); 1612 1613 const u2 name_index = cfs->get_u2_fast(); 1614 check_property(valid_symbol_at(name_index), 1615 "Invalid constant pool index %u for field name in class file %s", 1616 name_index, CHECK); 1617 const Symbol* const name = cp->symbol_at(name_index); 1618 verify_legal_field_name(name, CHECK); 1619 1620 const u2 signature_index = cfs->get_u2_fast(); 1621 check_property(valid_symbol_at(signature_index), 1622 "Invalid constant pool index %u for field signature in class file %s", 1623 signature_index, CHECK); 1624 const Symbol* const sig = cp->symbol_at(signature_index); 1625 verify_legal_field_signature(name, sig, CHECK); 1626 1627 u2 constantvalue_index = 0; 1628 bool is_synthetic = false; 1629 u2 generic_signature_index = 0; 1630 const bool is_static = access_flags.is_static(); 1631 FieldAnnotationCollector parsed_annotations(_loader_data); 1632 1633 const u2 attributes_count = cfs->get_u2_fast(); 1634 if (attributes_count > 0) { 1635 parse_field_attributes(cfs, 1636 attributes_count, 1637 is_static, 1638 signature_index, 1639 &constantvalue_index, 1640 &is_synthetic, 1641 &generic_signature_index, 1642 &parsed_annotations, 1643 CHECK); 1644 1645 if (parsed_annotations.field_annotations() != NULL) { 1646 if (_fields_annotations == NULL) { 1647 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1648 _loader_data, length, NULL, 1649 CHECK); 1650 } 1651 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1652 parsed_annotations.set_field_annotations(NULL); 1653 } 1654 if (parsed_annotations.field_type_annotations() != NULL) { 1655 if (_fields_type_annotations == NULL) { 1656 _fields_type_annotations = 1657 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1658 length, 1659 NULL, 1660 CHECK); 1661 } 1662 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1663 parsed_annotations.set_field_type_annotations(NULL); 1664 } 1665 1666 if (is_synthetic) { 1667 access_flags.set_is_synthetic(); 1668 } 1669 if (generic_signature_index != 0) { 1670 access_flags.set_field_has_generic_signature(); 1671 fa[generic_signature_slot] = generic_signature_index; 1672 generic_signature_slot ++; 1673 num_generic_signature ++; 1674 } 1675 } 1676 1677 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1678 field->initialize(access_flags.as_short(), 1679 name_index, 1680 signature_index, 1681 constantvalue_index); 1682 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1683 1684 // Remember how many oops we encountered and compute allocation type 1685 const FieldAllocationType atype = fac->update(is_static, type); 1686 field->set_allocation_type(atype); 1687 1688 // After field is initialized with type, we can augment it with aux info 1689 if (parsed_annotations.has_any_annotations()) 1690 parsed_annotations.apply_to(field); 1691 } 1692 1693 int index = length; 1694 if (num_injected != 0) { 1695 for (int n = 0; n < num_injected; n++) { 1696 // Check for duplicates 1697 if (injected[n].may_be_java) { 1698 const Symbol* const name = injected[n].name(); 1699 const Symbol* const signature = injected[n].signature(); 1700 bool duplicate = false; 1701 for (int i = 0; i < length; i++) { 1702 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1703 if (name == cp->symbol_at(f->name_index()) && 1704 signature == cp->symbol_at(f->signature_index())) { 1705 // Symbol is desclared in Java so skip this one 1706 duplicate = true; 1707 break; 1708 } 1709 } 1710 if (duplicate) { 1711 // These will be removed from the field array at the end 1712 continue; 1713 } 1714 } 1715 1716 // Injected field 1717 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1718 field->initialize(JVM_ACC_FIELD_INTERNAL, 1719 injected[n].name_index, 1720 injected[n].signature_index, 1721 0); 1722 1723 const BasicType type = Signature::basic_type(injected[n].signature()); 1724 1725 // Remember how many oops we encountered and compute allocation type 1726 const FieldAllocationType atype = fac->update(false, type); 1727 field->set_allocation_type(atype); 1728 index++; 1729 } 1730 } 1731 1732 assert(NULL == _fields, "invariant"); 1733 1734 _fields = 1735 MetadataFactory::new_array<u2>(_loader_data, 1736 index * FieldInfo::field_slots + num_generic_signature, 1737 CHECK); 1738 // Sometimes injected fields already exist in the Java source so 1739 // the fields array could be too long. In that case the 1740 // fields array is trimed. Also unused slots that were reserved 1741 // for generic signature indexes are discarded. 1742 { 1743 int i = 0; 1744 for (; i < index * FieldInfo::field_slots; i++) { 1745 _fields->at_put(i, fa[i]); 1746 } 1747 for (int j = total_fields * FieldInfo::field_slots; 1748 j < generic_signature_slot; j++) { 1749 _fields->at_put(i++, fa[j]); 1750 } 1751 assert(_fields->length() == i, ""); 1752 } 1753 1754 if (_need_verify && length > 1) { 1755 // Check duplicated fields 1756 ResourceMark rm(THREAD); 1757 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1758 THREAD, NameSigHash*, HASH_ROW_SIZE); 1759 initialize_hashtable(names_and_sigs); 1760 bool dup = false; 1761 const Symbol* name = NULL; 1762 const Symbol* sig = NULL; 1763 { 1764 debug_only(NoSafepointVerifier nsv;) 1765 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1766 name = fs.name(); 1767 sig = fs.signature(); 1768 // If no duplicates, add name/signature in hashtable names_and_sigs. 1769 if (!put_after_lookup(name, sig, names_and_sigs)) { 1770 dup = true; 1771 break; 1772 } 1773 } 1774 } 1775 if (dup) { 1776 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1777 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1778 } 1779 } 1780 } 1781 1782 1783 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1784 u4 code_length, 1785 u4 exception_table_length, 1786 TRAPS) { 1787 assert(cfs != NULL, "invariant"); 1788 1789 const unsafe_u2* const exception_table_start = cfs->current(); 1790 assert(exception_table_start != NULL, "null exception table"); 1791 1792 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1793 // end_pc, 1794 // handler_pc, 1795 // catch_type_index 1796 1797 // Will check legal target after parsing code array in verifier. 1798 if (_need_verify) { 1799 for (unsigned int i = 0; i < exception_table_length; i++) { 1800 const u2 start_pc = cfs->get_u2_fast(); 1801 const u2 end_pc = cfs->get_u2_fast(); 1802 const u2 handler_pc = cfs->get_u2_fast(); 1803 const u2 catch_type_index = cfs->get_u2_fast(); 1804 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1805 "Illegal exception table range in class file %s", 1806 CHECK_NULL); 1807 guarantee_property(handler_pc < code_length, 1808 "Illegal exception table handler in class file %s", 1809 CHECK_NULL); 1810 if (catch_type_index != 0) { 1811 guarantee_property(valid_klass_reference_at(catch_type_index), 1812 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1813 } 1814 } 1815 } else { 1816 cfs->skip_u2_fast(exception_table_length * 4); 1817 } 1818 return exception_table_start; 1819 } 1820 1821 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1822 u4 code_length, 1823 CompressedLineNumberWriteStream**const write_stream, 1824 TRAPS) { 1825 1826 const ClassFileStream* const cfs = _stream; 1827 unsigned int num_entries = cfs->get_u2(CHECK); 1828 1829 // Each entry is a u2 start_pc, and a u2 line_number 1830 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1831 1832 // Verify line number attribute and table length 1833 check_property( 1834 code_attribute_length == sizeof(u2) + length_in_bytes, 1835 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1836 1837 cfs->guarantee_more(length_in_bytes, CHECK); 1838 1839 if ((*write_stream) == NULL) { 1840 if (length_in_bytes > fixed_buffer_size) { 1841 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1842 } else { 1843 (*write_stream) = new CompressedLineNumberWriteStream( 1844 _linenumbertable_buffer, fixed_buffer_size); 1845 } 1846 } 1847 1848 while (num_entries-- > 0) { 1849 const u2 bci = cfs->get_u2_fast(); // start_pc 1850 const u2 line = cfs->get_u2_fast(); // line_number 1851 guarantee_property(bci < code_length, 1852 "Invalid pc in LineNumberTable in class file %s", CHECK); 1853 (*write_stream)->write_pair(bci, line); 1854 } 1855 } 1856 1857 1858 class LVT_Hash : public AllStatic { 1859 public: 1860 1861 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1862 /* 1863 * 3-tuple start_bci/length/slot has to be unique key, 1864 * so the following comparison seems to be redundant: 1865 * && elem->name_cp_index == entry->_elem->name_cp_index 1866 */ 1867 return (e0.start_bci == e1.start_bci && 1868 e0.length == e1.length && 1869 e0.name_cp_index == e1.name_cp_index && 1870 e0.slot == e1.slot); 1871 } 1872 1873 static unsigned int hash(LocalVariableTableElement const& e0) { 1874 unsigned int raw_hash = e0.start_bci; 1875 1876 raw_hash = e0.length + raw_hash * 37; 1877 raw_hash = e0.name_cp_index + raw_hash * 37; 1878 raw_hash = e0.slot + raw_hash * 37; 1879 1880 return raw_hash; 1881 } 1882 }; 1883 1884 1885 // Class file LocalVariableTable elements. 1886 class Classfile_LVT_Element { 1887 public: 1888 u2 start_bci; 1889 u2 length; 1890 u2 name_cp_index; 1891 u2 descriptor_cp_index; 1892 u2 slot; 1893 }; 1894 1895 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1896 LocalVariableTableElement* const lvt) { 1897 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1898 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1899 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1900 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1901 lvt->signature_cp_index = 0; 1902 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1903 } 1904 1905 // Function is used to parse both attributes: 1906 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1907 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1908 u4 code_length, 1909 u2 max_locals, 1910 u4 code_attribute_length, 1911 u2* const localvariable_table_length, 1912 bool isLVTT, 1913 TRAPS) { 1914 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1915 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1916 const unsigned int size = 1917 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1918 1919 const ConstantPool* const cp = _cp; 1920 1921 // Verify local variable table attribute has right length 1922 if (_need_verify) { 1923 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1924 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1925 } 1926 1927 const unsafe_u2* const localvariable_table_start = cfs->current(); 1928 assert(localvariable_table_start != NULL, "null local variable table"); 1929 if (!_need_verify) { 1930 cfs->skip_u2_fast(size); 1931 } else { 1932 cfs->guarantee_more(size * 2, CHECK_NULL); 1933 for(int i = 0; i < (*localvariable_table_length); i++) { 1934 const u2 start_pc = cfs->get_u2_fast(); 1935 const u2 length = cfs->get_u2_fast(); 1936 const u2 name_index = cfs->get_u2_fast(); 1937 const u2 descriptor_index = cfs->get_u2_fast(); 1938 const u2 index = cfs->get_u2_fast(); 1939 // Assign to a u4 to avoid overflow 1940 const u4 end_pc = (u4)start_pc + (u4)length; 1941 1942 if (start_pc >= code_length) { 1943 classfile_parse_error( 1944 "Invalid start_pc %u in %s in class file %s", 1945 start_pc, tbl_name, CHECK_NULL); 1946 } 1947 if (end_pc > code_length) { 1948 classfile_parse_error( 1949 "Invalid length %u in %s in class file %s", 1950 length, tbl_name, CHECK_NULL); 1951 } 1952 const int cp_size = cp->length(); 1953 guarantee_property(valid_symbol_at(name_index), 1954 "Name index %u in %s has bad constant type in class file %s", 1955 name_index, tbl_name, CHECK_NULL); 1956 guarantee_property(valid_symbol_at(descriptor_index), 1957 "Signature index %u in %s has bad constant type in class file %s", 1958 descriptor_index, tbl_name, CHECK_NULL); 1959 1960 const Symbol* const name = cp->symbol_at(name_index); 1961 const Symbol* const sig = cp->symbol_at(descriptor_index); 1962 verify_legal_field_name(name, CHECK_NULL); 1963 u2 extra_slot = 0; 1964 if (!isLVTT) { 1965 verify_legal_field_signature(name, sig, CHECK_NULL); 1966 1967 // 4894874: check special cases for double and long local variables 1968 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1969 sig == vmSymbols::type_signature(T_LONG)) { 1970 extra_slot = 1; 1971 } 1972 } 1973 guarantee_property((index + extra_slot) < max_locals, 1974 "Invalid index %u in %s in class file %s", 1975 index, tbl_name, CHECK_NULL); 1976 } 1977 } 1978 return localvariable_table_start; 1979 } 1980 1981 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1982 u4 code_attribute_length, 1983 bool need_verify, 1984 TRAPS) { 1985 assert(cfs != NULL, "invariant"); 1986 1987 if (0 == code_attribute_length) { 1988 return NULL; 1989 } 1990 1991 const u1* const stackmap_table_start = cfs->current(); 1992 assert(stackmap_table_start != NULL, "null stackmap table"); 1993 1994 // check code_attribute_length first 1995 cfs->skip_u1(code_attribute_length, CHECK_NULL); 1996 1997 if (!need_verify && !DumpSharedSpaces) { 1998 return NULL; 1999 } 2000 return stackmap_table_start; 2001 } 2002 2003 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2004 u2* const checked_exceptions_length, 2005 u4 method_attribute_length, 2006 TRAPS) { 2007 assert(cfs != NULL, "invariant"); 2008 assert(checked_exceptions_length != NULL, "invariant"); 2009 2010 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2011 *checked_exceptions_length = cfs->get_u2_fast(); 2012 const unsigned int size = 2013 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2014 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2015 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2016 if (!_need_verify) { 2017 cfs->skip_u2_fast(size); 2018 } else { 2019 // Verify each value in the checked exception table 2020 u2 checked_exception; 2021 const u2 len = *checked_exceptions_length; 2022 cfs->guarantee_more(2 * len, CHECK_NULL); 2023 for (int i = 0; i < len; i++) { 2024 checked_exception = cfs->get_u2_fast(); 2025 check_property( 2026 valid_klass_reference_at(checked_exception), 2027 "Exception name has bad type at constant pool %u in class file %s", 2028 checked_exception, CHECK_NULL); 2029 } 2030 } 2031 // check exceptions attribute length 2032 if (_need_verify) { 2033 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2034 sizeof(u2) * size), 2035 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2036 } 2037 return checked_exceptions_start; 2038 } 2039 2040 void ClassFileParser::throwIllegalSignature(const char* type, 2041 const Symbol* name, 2042 const Symbol* sig, 2043 TRAPS) const { 2044 assert(name != NULL, "invariant"); 2045 assert(sig != NULL, "invariant"); 2046 2047 ResourceMark rm(THREAD); 2048 Exceptions::fthrow(THREAD_AND_LOCATION, 2049 vmSymbols::java_lang_ClassFormatError(), 2050 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2051 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2052 } 2053 2054 AnnotationCollector::ID 2055 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2056 const Symbol* name) { 2057 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2058 // Privileged code can use all annotations. Other code silently drops some. 2059 const bool privileged = loader_data->is_the_null_class_loader_data() || 2060 loader_data->is_platform_class_loader_data() || 2061 loader_data->is_unsafe_anonymous(); 2062 switch (sid) { 2063 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2064 if (_location != _in_method) break; // only allow for methods 2065 if (!privileged) break; // only allow in privileged code 2066 return _method_CallerSensitive; 2067 } 2068 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2069 if (_location != _in_method) break; // only allow for methods 2070 if (!privileged) break; // only allow in privileged code 2071 return _method_ForceInline; 2072 } 2073 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2074 if (_location != _in_method) break; // only allow for methods 2075 if (!privileged) break; // only allow in privileged code 2076 return _method_DontInline; 2077 } 2078 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2079 if (_location != _in_method) break; // only allow for methods 2080 if (!privileged) break; // only allow in privileged code 2081 return _method_InjectedProfile; 2082 } 2083 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2084 if (_location != _in_method) break; // only allow for methods 2085 if (!privileged) break; // only allow in privileged code 2086 return _method_LambdaForm_Compiled; 2087 } 2088 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 2089 if (_location != _in_method) break; // only allow for methods 2090 if (!privileged) break; // only allow in privileged code 2091 return _method_Hidden; 2092 } 2093 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2094 if (_location != _in_method) break; // only allow for methods 2095 if (!privileged) break; // only allow in privileged code 2096 return _method_HotSpotIntrinsicCandidate; 2097 } 2098 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2099 if (_location != _in_field) break; // only allow for fields 2100 if (!privileged) break; // only allow in privileged code 2101 return _field_Stable; 2102 } 2103 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2104 if (_location != _in_field && _location != _in_class) { 2105 break; // only allow for fields and classes 2106 } 2107 if (!EnableContended || (RestrictContended && !privileged)) { 2108 break; // honor privileges 2109 } 2110 return _jdk_internal_vm_annotation_Contended; 2111 } 2112 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2113 if (_location != _in_method) break; // only allow for methods 2114 if (RestrictReservedStack && !privileged) break; // honor privileges 2115 return _jdk_internal_vm_annotation_ReservedStackAccess; 2116 } 2117 default: { 2118 break; 2119 } 2120 } 2121 return AnnotationCollector::_unknown; 2122 } 2123 2124 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2125 if (is_contended()) 2126 f->set_contended_group(contended_group()); 2127 if (is_stable()) 2128 f->set_stable(true); 2129 } 2130 2131 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2132 // If there's an error deallocate metadata for field annotations 2133 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2134 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2135 } 2136 2137 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2138 if (has_annotation(_method_CallerSensitive)) 2139 m->set_caller_sensitive(true); 2140 if (has_annotation(_method_ForceInline)) 2141 m->set_force_inline(true); 2142 if (has_annotation(_method_DontInline)) 2143 m->set_dont_inline(true); 2144 if (has_annotation(_method_InjectedProfile)) 2145 m->set_has_injected_profile(true); 2146 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2147 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2148 if (has_annotation(_method_Hidden)) 2149 m->set_hidden(true); 2150 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2151 m->set_intrinsic_candidate(true); 2152 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2153 m->set_has_reserved_stack_access(true); 2154 } 2155 2156 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2157 assert(ik != NULL, "invariant"); 2158 ik->set_is_contended(is_contended()); 2159 } 2160 2161 #define MAX_ARGS_SIZE 255 2162 #define MAX_CODE_SIZE 65535 2163 #define INITIAL_MAX_LVT_NUMBER 256 2164 2165 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2166 * 2167 * Rules for LVT's and LVTT's are: 2168 * - There can be any number of LVT's and LVTT's. 2169 * - If there are n LVT's, it is the same as if there was just 2170 * one LVT containing all the entries from the n LVT's. 2171 * - There may be no more than one LVT entry per local variable. 2172 * Two LVT entries are 'equal' if these fields are the same: 2173 * start_pc, length, name, slot 2174 * - There may be no more than one LVTT entry per each LVT entry. 2175 * Each LVTT entry has to match some LVT entry. 2176 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2177 */ 2178 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2179 int lvt_cnt, 2180 u2* const localvariable_table_length, 2181 const unsafe_u2** const localvariable_table_start, 2182 int lvtt_cnt, 2183 u2* const localvariable_type_table_length, 2184 const unsafe_u2** const localvariable_type_table_start, 2185 TRAPS) { 2186 2187 ResourceMark rm(THREAD); 2188 2189 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2190 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2191 2192 LVT_HashTable* const table = new LVT_HashTable(); 2193 2194 // To fill LocalVariableTable in 2195 const Classfile_LVT_Element* cf_lvt; 2196 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2197 2198 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2199 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2200 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2201 copy_lvt_element(&cf_lvt[idx], lvt); 2202 // If no duplicates, add LVT elem in hashtable. 2203 if (table->put(*lvt, lvt) == false 2204 && _need_verify 2205 && _major_version >= JAVA_1_5_VERSION) { 2206 classfile_parse_error("Duplicated LocalVariableTable attribute " 2207 "entry for '%s' in class file %s", 2208 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2209 CHECK); 2210 } 2211 } 2212 } 2213 2214 // To merge LocalVariableTable and LocalVariableTypeTable 2215 const Classfile_LVT_Element* cf_lvtt; 2216 LocalVariableTableElement lvtt_elem; 2217 2218 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2219 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2220 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2221 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2222 LocalVariableTableElement** entry = table->get(lvtt_elem); 2223 if (entry == NULL) { 2224 if (_need_verify) { 2225 classfile_parse_error("LVTT entry for '%s' in class file %s " 2226 "does not match any LVT entry", 2227 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2228 CHECK); 2229 } 2230 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2231 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2232 "entry for '%s' in class file %s", 2233 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2234 CHECK); 2235 } else { 2236 // to add generic signatures into LocalVariableTable 2237 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2238 } 2239 } 2240 } 2241 } 2242 2243 2244 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2245 const u1* runtime_visible_annotations, 2246 int runtime_visible_annotations_length, 2247 const u1* runtime_invisible_annotations, 2248 int runtime_invisible_annotations_length, 2249 const u1* runtime_visible_parameter_annotations, 2250 int runtime_visible_parameter_annotations_length, 2251 const u1* runtime_invisible_parameter_annotations, 2252 int runtime_invisible_parameter_annotations_length, 2253 const u1* runtime_visible_type_annotations, 2254 int runtime_visible_type_annotations_length, 2255 const u1* runtime_invisible_type_annotations, 2256 int runtime_invisible_type_annotations_length, 2257 const u1* annotation_default, 2258 int annotation_default_length, 2259 TRAPS) { 2260 2261 AnnotationArray* a; 2262 2263 if (runtime_visible_annotations_length + 2264 runtime_invisible_annotations_length > 0) { 2265 a = assemble_annotations(runtime_visible_annotations, 2266 runtime_visible_annotations_length, 2267 runtime_invisible_annotations, 2268 runtime_invisible_annotations_length, 2269 CHECK); 2270 cm->set_method_annotations(a); 2271 } 2272 2273 if (runtime_visible_parameter_annotations_length + 2274 runtime_invisible_parameter_annotations_length > 0) { 2275 a = assemble_annotations(runtime_visible_parameter_annotations, 2276 runtime_visible_parameter_annotations_length, 2277 runtime_invisible_parameter_annotations, 2278 runtime_invisible_parameter_annotations_length, 2279 CHECK); 2280 cm->set_parameter_annotations(a); 2281 } 2282 2283 if (annotation_default_length > 0) { 2284 a = assemble_annotations(annotation_default, 2285 annotation_default_length, 2286 NULL, 2287 0, 2288 CHECK); 2289 cm->set_default_annotations(a); 2290 } 2291 2292 if (runtime_visible_type_annotations_length + 2293 runtime_invisible_type_annotations_length > 0) { 2294 a = assemble_annotations(runtime_visible_type_annotations, 2295 runtime_visible_type_annotations_length, 2296 runtime_invisible_type_annotations, 2297 runtime_invisible_type_annotations_length, 2298 CHECK); 2299 cm->set_type_annotations(a); 2300 } 2301 } 2302 2303 2304 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2305 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2306 // Method* to save footprint, so we only know the size of the resulting Method* when the 2307 // entire method attribute is parsed. 2308 // 2309 // The promoted_flags parameter is used to pass relevant access_flags 2310 // from the method back up to the containing klass. These flag values 2311 // are added to klass's access_flags. 2312 2313 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2314 bool is_interface, 2315 const ConstantPool* cp, 2316 AccessFlags* const promoted_flags, 2317 TRAPS) { 2318 assert(cfs != NULL, "invariant"); 2319 assert(cp != NULL, "invariant"); 2320 assert(promoted_flags != NULL, "invariant"); 2321 2322 ResourceMark rm(THREAD); 2323 // Parse fixed parts: 2324 // access_flags, name_index, descriptor_index, attributes_count 2325 cfs->guarantee_more(8, CHECK_NULL); 2326 2327 int flags = cfs->get_u2_fast(); 2328 const u2 name_index = cfs->get_u2_fast(); 2329 const int cp_size = cp->length(); 2330 check_property( 2331 valid_symbol_at(name_index), 2332 "Illegal constant pool index %u for method name in class file %s", 2333 name_index, CHECK_NULL); 2334 const Symbol* const name = cp->symbol_at(name_index); 2335 verify_legal_method_name(name, CHECK_NULL); 2336 2337 const u2 signature_index = cfs->get_u2_fast(); 2338 guarantee_property( 2339 valid_symbol_at(signature_index), 2340 "Illegal constant pool index %u for method signature in class file %s", 2341 signature_index, CHECK_NULL); 2342 const Symbol* const signature = cp->symbol_at(signature_index); 2343 2344 if (name == vmSymbols::class_initializer_name()) { 2345 // We ignore the other access flags for a valid class initializer. 2346 // (JVM Spec 2nd ed., chapter 4.6) 2347 if (_major_version < 51) { // backward compatibility 2348 flags = JVM_ACC_STATIC; 2349 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2350 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2351 } else { 2352 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2353 } 2354 } else { 2355 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2356 } 2357 2358 if (name == vmSymbols::object_initializer_name() && is_interface) { 2359 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2360 } 2361 2362 int args_size = -1; // only used when _need_verify is true 2363 if (_need_verify) { 2364 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2365 verify_legal_method_signature(name, signature, CHECK_NULL); 2366 if (args_size > MAX_ARGS_SIZE) { 2367 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2368 } 2369 } 2370 2371 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2372 2373 // Default values for code and exceptions attribute elements 2374 u2 max_stack = 0; 2375 u2 max_locals = 0; 2376 u4 code_length = 0; 2377 const u1* code_start = 0; 2378 u2 exception_table_length = 0; 2379 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2380 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2381 u2 checked_exceptions_length = 0; 2382 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2383 CompressedLineNumberWriteStream* linenumber_table = NULL; 2384 int linenumber_table_length = 0; 2385 int total_lvt_length = 0; 2386 u2 lvt_cnt = 0; 2387 u2 lvtt_cnt = 0; 2388 bool lvt_allocated = false; 2389 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2390 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2391 u2* localvariable_table_length = NULL; 2392 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2393 u2* localvariable_type_table_length = NULL; 2394 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2395 int method_parameters_length = -1; 2396 const u1* method_parameters_data = NULL; 2397 bool method_parameters_seen = false; 2398 bool parsed_code_attribute = false; 2399 bool parsed_checked_exceptions_attribute = false; 2400 bool parsed_stackmap_attribute = false; 2401 // stackmap attribute - JDK1.5 2402 const u1* stackmap_data = NULL; 2403 int stackmap_data_length = 0; 2404 u2 generic_signature_index = 0; 2405 MethodAnnotationCollector parsed_annotations; 2406 const u1* runtime_visible_annotations = NULL; 2407 int runtime_visible_annotations_length = 0; 2408 const u1* runtime_invisible_annotations = NULL; 2409 int runtime_invisible_annotations_length = 0; 2410 const u1* runtime_visible_parameter_annotations = NULL; 2411 int runtime_visible_parameter_annotations_length = 0; 2412 const u1* runtime_invisible_parameter_annotations = NULL; 2413 int runtime_invisible_parameter_annotations_length = 0; 2414 const u1* runtime_visible_type_annotations = NULL; 2415 int runtime_visible_type_annotations_length = 0; 2416 const u1* runtime_invisible_type_annotations = NULL; 2417 int runtime_invisible_type_annotations_length = 0; 2418 bool runtime_invisible_annotations_exists = false; 2419 bool runtime_invisible_type_annotations_exists = false; 2420 bool runtime_invisible_parameter_annotations_exists = false; 2421 const u1* annotation_default = NULL; 2422 int annotation_default_length = 0; 2423 2424 // Parse code and exceptions attribute 2425 u2 method_attributes_count = cfs->get_u2_fast(); 2426 while (method_attributes_count--) { 2427 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2428 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2429 const u4 method_attribute_length = cfs->get_u4_fast(); 2430 check_property( 2431 valid_symbol_at(method_attribute_name_index), 2432 "Invalid method attribute name index %u in class file %s", 2433 method_attribute_name_index, CHECK_NULL); 2434 2435 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2436 if (method_attribute_name == vmSymbols::tag_code()) { 2437 // Parse Code attribute 2438 if (_need_verify) { 2439 guarantee_property( 2440 !access_flags.is_native() && !access_flags.is_abstract(), 2441 "Code attribute in native or abstract methods in class file %s", 2442 CHECK_NULL); 2443 } 2444 if (parsed_code_attribute) { 2445 classfile_parse_error("Multiple Code attributes in class file %s", 2446 CHECK_NULL); 2447 } 2448 parsed_code_attribute = true; 2449 2450 // Stack size, locals size, and code size 2451 cfs->guarantee_more(8, CHECK_NULL); 2452 max_stack = cfs->get_u2_fast(); 2453 max_locals = cfs->get_u2_fast(); 2454 code_length = cfs->get_u4_fast(); 2455 if (_need_verify) { 2456 guarantee_property(args_size <= max_locals, 2457 "Arguments can't fit into locals in class file %s", 2458 CHECK_NULL); 2459 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2460 "Invalid method Code length %u in class file %s", 2461 code_length, CHECK_NULL); 2462 } 2463 // Code pointer 2464 code_start = cfs->current(); 2465 assert(code_start != NULL, "null code start"); 2466 cfs->guarantee_more(code_length, CHECK_NULL); 2467 cfs->skip_u1_fast(code_length); 2468 2469 // Exception handler table 2470 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2471 exception_table_length = cfs->get_u2_fast(); 2472 if (exception_table_length > 0) { 2473 exception_table_start = parse_exception_table(cfs, 2474 code_length, 2475 exception_table_length, 2476 CHECK_NULL); 2477 } 2478 2479 // Parse additional attributes in code attribute 2480 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2481 u2 code_attributes_count = cfs->get_u2_fast(); 2482 2483 unsigned int calculated_attribute_length = 0; 2484 2485 calculated_attribute_length = 2486 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2487 calculated_attribute_length += 2488 code_length + 2489 sizeof(exception_table_length) + 2490 sizeof(code_attributes_count) + 2491 exception_table_length * 2492 ( sizeof(u2) + // start_pc 2493 sizeof(u2) + // end_pc 2494 sizeof(u2) + // handler_pc 2495 sizeof(u2) ); // catch_type_index 2496 2497 while (code_attributes_count--) { 2498 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2499 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2500 const u4 code_attribute_length = cfs->get_u4_fast(); 2501 calculated_attribute_length += code_attribute_length + 2502 sizeof(code_attribute_name_index) + 2503 sizeof(code_attribute_length); 2504 check_property(valid_symbol_at(code_attribute_name_index), 2505 "Invalid code attribute name index %u in class file %s", 2506 code_attribute_name_index, 2507 CHECK_NULL); 2508 if (LoadLineNumberTables && 2509 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2510 // Parse and compress line number table 2511 parse_linenumber_table(code_attribute_length, 2512 code_length, 2513 &linenumber_table, 2514 CHECK_NULL); 2515 2516 } else if (LoadLocalVariableTables && 2517 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2518 // Parse local variable table 2519 if (!lvt_allocated) { 2520 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2521 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2522 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2523 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2524 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2525 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2526 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2527 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2528 lvt_allocated = true; 2529 } 2530 if (lvt_cnt == max_lvt_cnt) { 2531 max_lvt_cnt <<= 1; 2532 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2533 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2534 } 2535 localvariable_table_start[lvt_cnt] = 2536 parse_localvariable_table(cfs, 2537 code_length, 2538 max_locals, 2539 code_attribute_length, 2540 &localvariable_table_length[lvt_cnt], 2541 false, // is not LVTT 2542 CHECK_NULL); 2543 total_lvt_length += localvariable_table_length[lvt_cnt]; 2544 lvt_cnt++; 2545 } else if (LoadLocalVariableTypeTables && 2546 _major_version >= JAVA_1_5_VERSION && 2547 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2548 if (!lvt_allocated) { 2549 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2550 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2551 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2552 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2553 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2554 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2555 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2556 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2557 lvt_allocated = true; 2558 } 2559 // Parse local variable type table 2560 if (lvtt_cnt == max_lvtt_cnt) { 2561 max_lvtt_cnt <<= 1; 2562 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2563 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2564 } 2565 localvariable_type_table_start[lvtt_cnt] = 2566 parse_localvariable_table(cfs, 2567 code_length, 2568 max_locals, 2569 code_attribute_length, 2570 &localvariable_type_table_length[lvtt_cnt], 2571 true, // is LVTT 2572 CHECK_NULL); 2573 lvtt_cnt++; 2574 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2575 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2576 // Stack map is only needed by the new verifier in JDK1.5. 2577 if (parsed_stackmap_attribute) { 2578 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2579 } 2580 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2581 stackmap_data_length = code_attribute_length; 2582 parsed_stackmap_attribute = true; 2583 } else { 2584 // Skip unknown attributes 2585 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2586 } 2587 } 2588 // check method attribute length 2589 if (_need_verify) { 2590 guarantee_property(method_attribute_length == calculated_attribute_length, 2591 "Code segment has wrong length in class file %s", 2592 CHECK_NULL); 2593 } 2594 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2595 // Parse Exceptions attribute 2596 if (parsed_checked_exceptions_attribute) { 2597 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2598 CHECK_NULL); 2599 } 2600 parsed_checked_exceptions_attribute = true; 2601 checked_exceptions_start = 2602 parse_checked_exceptions(cfs, 2603 &checked_exceptions_length, 2604 method_attribute_length, 2605 CHECK_NULL); 2606 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2607 // reject multiple method parameters 2608 if (method_parameters_seen) { 2609 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2610 CHECK_NULL); 2611 } 2612 method_parameters_seen = true; 2613 method_parameters_length = cfs->get_u1_fast(); 2614 const u2 real_length = (method_parameters_length * 4u) + 1u; 2615 if (method_attribute_length != real_length) { 2616 classfile_parse_error( 2617 "Invalid MethodParameters method attribute length %u in class file", 2618 method_attribute_length, CHECK_NULL); 2619 } 2620 method_parameters_data = cfs->current(); 2621 cfs->skip_u2_fast(method_parameters_length); 2622 cfs->skip_u2_fast(method_parameters_length); 2623 // ignore this attribute if it cannot be reflected 2624 if (!SystemDictionary::Parameter_klass_loaded()) 2625 method_parameters_length = -1; 2626 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2627 if (method_attribute_length != 0) { 2628 classfile_parse_error( 2629 "Invalid Synthetic method attribute length %u in class file %s", 2630 method_attribute_length, CHECK_NULL); 2631 } 2632 // Should we check that there hasn't already been a synthetic attribute? 2633 access_flags.set_is_synthetic(); 2634 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2635 if (method_attribute_length != 0) { 2636 classfile_parse_error( 2637 "Invalid Deprecated method attribute length %u in class file %s", 2638 method_attribute_length, CHECK_NULL); 2639 } 2640 } else if (_major_version >= JAVA_1_5_VERSION) { 2641 if (method_attribute_name == vmSymbols::tag_signature()) { 2642 if (generic_signature_index != 0) { 2643 classfile_parse_error( 2644 "Multiple Signature attributes for method in class file %s", 2645 CHECK_NULL); 2646 } 2647 if (method_attribute_length != 2) { 2648 classfile_parse_error( 2649 "Invalid Signature attribute length %u in class file %s", 2650 method_attribute_length, CHECK_NULL); 2651 } 2652 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2653 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2654 if (runtime_visible_annotations != NULL) { 2655 classfile_parse_error( 2656 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2657 CHECK_NULL); 2658 } 2659 runtime_visible_annotations_length = method_attribute_length; 2660 runtime_visible_annotations = cfs->current(); 2661 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2662 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2663 parse_annotations(cp, 2664 runtime_visible_annotations, 2665 runtime_visible_annotations_length, 2666 &parsed_annotations, 2667 _loader_data, 2668 CHECK_NULL); 2669 cfs->skip_u1_fast(runtime_visible_annotations_length); 2670 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2671 if (runtime_invisible_annotations_exists) { 2672 classfile_parse_error( 2673 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2674 CHECK_NULL); 2675 } 2676 runtime_invisible_annotations_exists = true; 2677 if (PreserveAllAnnotations) { 2678 runtime_invisible_annotations_length = method_attribute_length; 2679 runtime_invisible_annotations = cfs->current(); 2680 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2681 } 2682 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2683 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2684 if (runtime_visible_parameter_annotations != NULL) { 2685 classfile_parse_error( 2686 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2687 CHECK_NULL); 2688 } 2689 runtime_visible_parameter_annotations_length = method_attribute_length; 2690 runtime_visible_parameter_annotations = cfs->current(); 2691 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2692 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2693 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2694 if (runtime_invisible_parameter_annotations_exists) { 2695 classfile_parse_error( 2696 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2697 CHECK_NULL); 2698 } 2699 runtime_invisible_parameter_annotations_exists = true; 2700 if (PreserveAllAnnotations) { 2701 runtime_invisible_parameter_annotations_length = method_attribute_length; 2702 runtime_invisible_parameter_annotations = cfs->current(); 2703 assert(runtime_invisible_parameter_annotations != NULL, 2704 "null invisible parameter annotations"); 2705 } 2706 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2707 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2708 if (annotation_default != NULL) { 2709 classfile_parse_error( 2710 "Multiple AnnotationDefault attributes for method in class file %s", 2711 CHECK_NULL); 2712 } 2713 annotation_default_length = method_attribute_length; 2714 annotation_default = cfs->current(); 2715 assert(annotation_default != NULL, "null annotation default"); 2716 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2717 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2718 if (runtime_visible_type_annotations != NULL) { 2719 classfile_parse_error( 2720 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2721 CHECK_NULL); 2722 } 2723 runtime_visible_type_annotations_length = method_attribute_length; 2724 runtime_visible_type_annotations = cfs->current(); 2725 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2726 // No need for the VM to parse Type annotations 2727 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2728 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2729 if (runtime_invisible_type_annotations_exists) { 2730 classfile_parse_error( 2731 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2732 CHECK_NULL); 2733 } else { 2734 runtime_invisible_type_annotations_exists = true; 2735 } 2736 if (PreserveAllAnnotations) { 2737 runtime_invisible_type_annotations_length = method_attribute_length; 2738 runtime_invisible_type_annotations = cfs->current(); 2739 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2740 } 2741 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2742 } else { 2743 // Skip unknown attributes 2744 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2745 } 2746 } else { 2747 // Skip unknown attributes 2748 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2749 } 2750 } 2751 2752 if (linenumber_table != NULL) { 2753 linenumber_table->write_terminator(); 2754 linenumber_table_length = linenumber_table->position(); 2755 } 2756 2757 // Make sure there's at least one Code attribute in non-native/non-abstract method 2758 if (_need_verify) { 2759 guarantee_property(access_flags.is_native() || 2760 access_flags.is_abstract() || 2761 parsed_code_attribute, 2762 "Absent Code attribute in method that is not native or abstract in class file %s", 2763 CHECK_NULL); 2764 } 2765 2766 // All sizing information for a Method* is finally available, now create it 2767 InlineTableSizes sizes( 2768 total_lvt_length, 2769 linenumber_table_length, 2770 exception_table_length, 2771 checked_exceptions_length, 2772 method_parameters_length, 2773 generic_signature_index, 2774 runtime_visible_annotations_length + 2775 runtime_invisible_annotations_length, 2776 runtime_visible_parameter_annotations_length + 2777 runtime_invisible_parameter_annotations_length, 2778 runtime_visible_type_annotations_length + 2779 runtime_invisible_type_annotations_length, 2780 annotation_default_length, 2781 0); 2782 2783 Method* const m = Method::allocate(_loader_data, 2784 code_length, 2785 access_flags, 2786 &sizes, 2787 ConstMethod::NORMAL, 2788 CHECK_NULL); 2789 2790 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2791 2792 // Fill in information from fixed part (access_flags already set) 2793 m->set_constants(_cp); 2794 m->set_name_index(name_index); 2795 m->set_signature_index(signature_index); 2796 m->compute_from_signature(cp->symbol_at(signature_index)); 2797 assert(args_size < 0 || args_size == m->size_of_parameters(), ""); 2798 2799 // Fill in code attribute information 2800 m->set_max_stack(max_stack); 2801 m->set_max_locals(max_locals); 2802 if (stackmap_data != NULL) { 2803 m->constMethod()->copy_stackmap_data(_loader_data, 2804 (u1*)stackmap_data, 2805 stackmap_data_length, 2806 CHECK_NULL); 2807 } 2808 2809 // Copy byte codes 2810 m->set_code((u1*)code_start); 2811 2812 // Copy line number table 2813 if (linenumber_table != NULL) { 2814 memcpy(m->compressed_linenumber_table(), 2815 linenumber_table->buffer(), 2816 linenumber_table_length); 2817 } 2818 2819 // Copy exception table 2820 if (exception_table_length > 0) { 2821 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2822 m->exception_table_start(), 2823 exception_table_length * sizeof(ExceptionTableElement), 2824 sizeof(u2)); 2825 } 2826 2827 // Copy method parameters 2828 if (method_parameters_length > 0) { 2829 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2830 for (int i = 0; i < method_parameters_length; i++) { 2831 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2832 method_parameters_data += 2; 2833 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2834 method_parameters_data += 2; 2835 } 2836 } 2837 2838 // Copy checked exceptions 2839 if (checked_exceptions_length > 0) { 2840 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2841 m->checked_exceptions_start(), 2842 checked_exceptions_length * sizeof(CheckedExceptionElement), 2843 sizeof(u2)); 2844 } 2845 2846 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2847 if (total_lvt_length > 0) { 2848 promoted_flags->set_has_localvariable_table(); 2849 copy_localvariable_table(m->constMethod(), 2850 lvt_cnt, 2851 localvariable_table_length, 2852 localvariable_table_start, 2853 lvtt_cnt, 2854 localvariable_type_table_length, 2855 localvariable_type_table_start, 2856 CHECK_NULL); 2857 } 2858 2859 if (parsed_annotations.has_any_annotations()) 2860 parsed_annotations.apply_to(methodHandle(THREAD, m)); 2861 2862 // Copy annotations 2863 copy_method_annotations(m->constMethod(), 2864 runtime_visible_annotations, 2865 runtime_visible_annotations_length, 2866 runtime_invisible_annotations, 2867 runtime_invisible_annotations_length, 2868 runtime_visible_parameter_annotations, 2869 runtime_visible_parameter_annotations_length, 2870 runtime_invisible_parameter_annotations, 2871 runtime_invisible_parameter_annotations_length, 2872 runtime_visible_type_annotations, 2873 runtime_visible_type_annotations_length, 2874 runtime_invisible_type_annotations, 2875 runtime_invisible_type_annotations_length, 2876 annotation_default, 2877 annotation_default_length, 2878 CHECK_NULL); 2879 2880 if (name == vmSymbols::finalize_method_name() && 2881 signature == vmSymbols::void_method_signature()) { 2882 if (m->is_empty_method()) { 2883 _has_empty_finalizer = true; 2884 } else { 2885 _has_finalizer = true; 2886 } 2887 } 2888 if (name == vmSymbols::object_initializer_name() && 2889 signature == vmSymbols::void_method_signature() && 2890 m->is_vanilla_constructor()) { 2891 _has_vanilla_constructor = true; 2892 } 2893 2894 NOT_PRODUCT(m->verify()); 2895 return m; 2896 } 2897 2898 2899 // The promoted_flags parameter is used to pass relevant access_flags 2900 // from the methods back up to the containing klass. These flag values 2901 // are added to klass's access_flags. 2902 // Side-effects: populates the _methods field in the parser 2903 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2904 bool is_interface, 2905 AccessFlags* promoted_flags, 2906 bool* has_final_method, 2907 bool* declares_nonstatic_concrete_methods, 2908 TRAPS) { 2909 assert(cfs != NULL, "invariant"); 2910 assert(promoted_flags != NULL, "invariant"); 2911 assert(has_final_method != NULL, "invariant"); 2912 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 2913 2914 assert(NULL == _methods, "invariant"); 2915 2916 cfs->guarantee_more(2, CHECK); // length 2917 const u2 length = cfs->get_u2_fast(); 2918 if (length == 0) { 2919 _methods = Universe::the_empty_method_array(); 2920 } else { 2921 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2922 length, 2923 NULL, 2924 CHECK); 2925 2926 for (int index = 0; index < length; index++) { 2927 Method* method = parse_method(cfs, 2928 is_interface, 2929 _cp, 2930 promoted_flags, 2931 CHECK); 2932 2933 if (method->is_final()) { 2934 *has_final_method = true; 2935 } 2936 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2937 // used for interface initialization, and default method inheritance analysis 2938 if (is_interface && !(*declares_nonstatic_concrete_methods) 2939 && !method->is_abstract() && !method->is_static()) { 2940 *declares_nonstatic_concrete_methods = true; 2941 } 2942 _methods->at_put(index, method); 2943 } 2944 2945 if (_need_verify && length > 1) { 2946 // Check duplicated methods 2947 ResourceMark rm(THREAD); 2948 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2949 THREAD, NameSigHash*, HASH_ROW_SIZE); 2950 initialize_hashtable(names_and_sigs); 2951 bool dup = false; 2952 const Symbol* name = NULL; 2953 const Symbol* sig = NULL; 2954 { 2955 debug_only(NoSafepointVerifier nsv;) 2956 for (int i = 0; i < length; i++) { 2957 const Method* const m = _methods->at(i); 2958 name = m->name(); 2959 sig = m->signature(); 2960 // If no duplicates, add name/signature in hashtable names_and_sigs. 2961 if (!put_after_lookup(name, sig, names_and_sigs)) { 2962 dup = true; 2963 break; 2964 } 2965 } 2966 } 2967 if (dup) { 2968 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2969 name->as_C_string(), sig->as_klass_external_name(), CHECK); 2970 } 2971 } 2972 } 2973 } 2974 2975 static const intArray* sort_methods(Array<Method*>* methods) { 2976 const int length = methods->length(); 2977 // If JVMTI original method ordering or sharing is enabled we have to 2978 // remember the original class file ordering. 2979 // We temporarily use the vtable_index field in the Method* to store the 2980 // class file index, so we can read in after calling qsort. 2981 // Put the method ordering in the shared archive. 2982 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 2983 for (int index = 0; index < length; index++) { 2984 Method* const m = methods->at(index); 2985 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2986 m->set_vtable_index(index); 2987 } 2988 } 2989 // Sort method array by ascending method name (for faster lookups & vtable construction) 2990 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2991 Method::sort_methods(methods); 2992 2993 intArray* method_ordering = NULL; 2994 // If JVMTI original method ordering or sharing is enabled construct int 2995 // array remembering the original ordering 2996 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 2997 method_ordering = new intArray(length, length, -1); 2998 for (int index = 0; index < length; index++) { 2999 Method* const m = methods->at(index); 3000 const int old_index = m->vtable_index(); 3001 assert(old_index >= 0 && old_index < length, "invalid method index"); 3002 method_ordering->at_put(index, old_index); 3003 m->set_vtable_index(Method::invalid_vtable_index); 3004 } 3005 } 3006 return method_ordering; 3007 } 3008 3009 // Parse generic_signature attribute for methods and fields 3010 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3011 TRAPS) { 3012 assert(cfs != NULL, "invariant"); 3013 3014 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3015 const u2 generic_signature_index = cfs->get_u2_fast(); 3016 check_property( 3017 valid_symbol_at(generic_signature_index), 3018 "Invalid Signature attribute at constant pool index %u in class file %s", 3019 generic_signature_index, CHECK_0); 3020 return generic_signature_index; 3021 } 3022 3023 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3024 TRAPS) { 3025 3026 assert(cfs != NULL, "invariant"); 3027 3028 cfs->guarantee_more(2, CHECK); // sourcefile_index 3029 const u2 sourcefile_index = cfs->get_u2_fast(); 3030 check_property( 3031 valid_symbol_at(sourcefile_index), 3032 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3033 sourcefile_index, CHECK); 3034 set_class_sourcefile_index(sourcefile_index); 3035 } 3036 3037 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3038 int length, 3039 TRAPS) { 3040 assert(cfs != NULL, "invariant"); 3041 3042 const u1* const sde_buffer = cfs->current(); 3043 assert(sde_buffer != NULL, "null sde buffer"); 3044 3045 // Don't bother storing it if there is no way to retrieve it 3046 if (JvmtiExport::can_get_source_debug_extension()) { 3047 assert((length+1) > length, "Overflow checking"); 3048 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3049 for (int i = 0; i < length; i++) { 3050 sde[i] = sde_buffer[i]; 3051 } 3052 sde[length] = '\0'; 3053 set_class_sde_buffer((const char*)sde, length); 3054 } 3055 // Got utf8 string, set stream position forward 3056 cfs->skip_u1(length, CHECK); 3057 } 3058 3059 3060 // Inner classes can be static, private or protected (classic VM does this) 3061 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3062 JVM_ACC_PRIVATE | \ 3063 JVM_ACC_PROTECTED | \ 3064 JVM_ACC_STATIC \ 3065 ) 3066 3067 // Return number of classes in the inner classes attribute table 3068 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3069 const u1* const inner_classes_attribute_start, 3070 bool parsed_enclosingmethod_attribute, 3071 u2 enclosing_method_class_index, 3072 u2 enclosing_method_method_index, 3073 TRAPS) { 3074 const u1* const current_mark = cfs->current(); 3075 u2 length = 0; 3076 if (inner_classes_attribute_start != NULL) { 3077 cfs->set_current(inner_classes_attribute_start); 3078 cfs->guarantee_more(2, CHECK_0); // length 3079 length = cfs->get_u2_fast(); 3080 } 3081 3082 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3083 // method data: 3084 // [inner_class_info_index, 3085 // outer_class_info_index, 3086 // inner_name_index, 3087 // inner_class_access_flags, 3088 // ... 3089 // enclosing_method_class_index, 3090 // enclosing_method_method_index] 3091 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3092 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3093 _inner_classes = inner_classes; 3094 3095 int index = 0; 3096 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3097 for (int n = 0; n < length; n++) { 3098 // Inner class index 3099 const u2 inner_class_info_index = cfs->get_u2_fast(); 3100 check_property( 3101 valid_klass_reference_at(inner_class_info_index), 3102 "inner_class_info_index %u has bad constant type in class file %s", 3103 inner_class_info_index, CHECK_0); 3104 // Outer class index 3105 const u2 outer_class_info_index = cfs->get_u2_fast(); 3106 check_property( 3107 outer_class_info_index == 0 || 3108 valid_klass_reference_at(outer_class_info_index), 3109 "outer_class_info_index %u has bad constant type in class file %s", 3110 outer_class_info_index, CHECK_0); 3111 // Inner class name 3112 const u2 inner_name_index = cfs->get_u2_fast(); 3113 check_property( 3114 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3115 "inner_name_index %u has bad constant type in class file %s", 3116 inner_name_index, CHECK_0); 3117 if (_need_verify) { 3118 guarantee_property(inner_class_info_index != outer_class_info_index, 3119 "Class is both outer and inner class in class file %s", CHECK_0); 3120 } 3121 // Access flags 3122 jint flags; 3123 // JVM_ACC_MODULE is defined in JDK-9 and later. 3124 if (_major_version >= JAVA_9_VERSION) { 3125 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3126 } else { 3127 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3128 } 3129 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3130 // Set abstract bit for old class files for backward compatibility 3131 flags |= JVM_ACC_ABSTRACT; 3132 } 3133 verify_legal_class_modifiers(flags, CHECK_0); 3134 AccessFlags inner_access_flags(flags); 3135 3136 inner_classes->at_put(index++, inner_class_info_index); 3137 inner_classes->at_put(index++, outer_class_info_index); 3138 inner_classes->at_put(index++, inner_name_index); 3139 inner_classes->at_put(index++, inner_access_flags.as_short()); 3140 } 3141 3142 // 4347400: make sure there's no duplicate entry in the classes array 3143 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3144 for(int i = 0; i < length * 4; i += 4) { 3145 for(int j = i + 4; j < length * 4; j += 4) { 3146 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3147 inner_classes->at(i+1) != inner_classes->at(j+1) || 3148 inner_classes->at(i+2) != inner_classes->at(j+2) || 3149 inner_classes->at(i+3) != inner_classes->at(j+3)), 3150 "Duplicate entry in InnerClasses in class file %s", 3151 CHECK_0); 3152 } 3153 } 3154 } 3155 3156 // Set EnclosingMethod class and method indexes. 3157 if (parsed_enclosingmethod_attribute) { 3158 inner_classes->at_put(index++, enclosing_method_class_index); 3159 inner_classes->at_put(index++, enclosing_method_method_index); 3160 } 3161 assert(index == size, "wrong size"); 3162 3163 // Restore buffer's current position. 3164 cfs->set_current(current_mark); 3165 3166 return length; 3167 } 3168 3169 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3170 const u1* const nest_members_attribute_start, 3171 TRAPS) { 3172 const u1* const current_mark = cfs->current(); 3173 u2 length = 0; 3174 if (nest_members_attribute_start != NULL) { 3175 cfs->set_current(nest_members_attribute_start); 3176 cfs->guarantee_more(2, CHECK_0); // length 3177 length = cfs->get_u2_fast(); 3178 } 3179 const int size = length; 3180 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3181 _nest_members = nest_members; 3182 3183 int index = 0; 3184 cfs->guarantee_more(2 * length, CHECK_0); 3185 for (int n = 0; n < length; n++) { 3186 const u2 class_info_index = cfs->get_u2_fast(); 3187 check_property( 3188 valid_klass_reference_at(class_info_index), 3189 "Nest member class_info_index %u has bad constant type in class file %s", 3190 class_info_index, CHECK_0); 3191 nest_members->at_put(index++, class_info_index); 3192 } 3193 assert(index == size, "wrong size"); 3194 3195 // Restore buffer's current position. 3196 cfs->set_current(current_mark); 3197 3198 return length; 3199 } 3200 3201 // Record { 3202 // u2 attribute_name_index; 3203 // u4 attribute_length; 3204 // u2 components_count; 3205 // component_info components[components_count]; 3206 // } 3207 // component_info { 3208 // u2 name_index; 3209 // u2 descriptor_index 3210 // u2 attributes_count; 3211 // attribute_info_attributes[attributes_count]; 3212 // } 3213 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, 3214 const ConstantPool* cp, 3215 const u1* const record_attribute_start, 3216 TRAPS) { 3217 const u1* const current_mark = cfs->current(); 3218 int components_count = 0; 3219 unsigned int calculate_attr_size = 0; 3220 if (record_attribute_start != NULL) { 3221 cfs->set_current(record_attribute_start); 3222 cfs->guarantee_more(2, CHECK_0); // num of components 3223 components_count = (int)cfs->get_u2_fast(); 3224 calculate_attr_size = 2; 3225 } 3226 3227 Array<RecordComponent*>* const record_components = 3228 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0); 3229 _record_components = record_components; 3230 3231 for (int x = 0; x < components_count; x++) { 3232 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count 3233 3234 const u2 name_index = cfs->get_u2_fast(); 3235 check_property(valid_symbol_at(name_index), 3236 "Invalid constant pool index %u for name in Record attribute in class file %s", 3237 name_index, CHECK_0); 3238 const Symbol* const name = cp->symbol_at(name_index); 3239 verify_legal_field_name(name, CHECK_0); 3240 3241 const u2 descriptor_index = cfs->get_u2_fast(); 3242 check_property(valid_symbol_at(descriptor_index), 3243 "Invalid constant pool index %u for descriptor in Record attribute in class file %s", 3244 descriptor_index, CHECK_0); 3245 const Symbol* const descr = cp->symbol_at(descriptor_index); 3246 verify_legal_field_signature(name, descr, CHECK_0); 3247 3248 const u2 attributes_count = cfs->get_u2_fast(); 3249 calculate_attr_size += 6; 3250 u2 generic_sig_index = 0; 3251 const u1* runtime_visible_annotations = NULL; 3252 int runtime_visible_annotations_length = 0; 3253 const u1* runtime_invisible_annotations = NULL; 3254 int runtime_invisible_annotations_length = 0; 3255 bool runtime_invisible_annotations_exists = false; 3256 const u1* runtime_visible_type_annotations = NULL; 3257 int runtime_visible_type_annotations_length = 0; 3258 const u1* runtime_invisible_type_annotations = NULL; 3259 int runtime_invisible_type_annotations_length = 0; 3260 bool runtime_invisible_type_annotations_exists = false; 3261 3262 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, 3263 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. 3264 for (int y = 0; y < attributes_count; y++) { 3265 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length 3266 const u2 attribute_name_index = cfs->get_u2_fast(); 3267 const u4 attribute_length = cfs->get_u4_fast(); 3268 calculate_attr_size += 6; 3269 check_property( 3270 valid_symbol_at(attribute_name_index), 3271 "Invalid Record attribute name index %u in class file %s", 3272 attribute_name_index, CHECK_0); 3273 3274 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 3275 if (attribute_name == vmSymbols::tag_signature()) { 3276 if (generic_sig_index != 0) { 3277 classfile_parse_error( 3278 "Multiple Signature attributes for Record component in class file %s", 3279 CHECK_0); 3280 } 3281 if (attribute_length != 2) { 3282 classfile_parse_error( 3283 "Invalid Signature attribute length %u in Record component in class file %s", 3284 attribute_length, CHECK_0); 3285 } 3286 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); 3287 3288 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 3289 if (runtime_visible_annotations != NULL) { 3290 classfile_parse_error( 3291 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0); 3292 } 3293 runtime_visible_annotations_length = attribute_length; 3294 runtime_visible_annotations = cfs->current(); 3295 3296 assert(runtime_visible_annotations != NULL, "null record component visible annotation"); 3297 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); 3298 cfs->skip_u1_fast(runtime_visible_annotations_length); 3299 3300 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 3301 if (runtime_invisible_annotations_exists) { 3302 classfile_parse_error( 3303 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0); 3304 } 3305 runtime_invisible_annotations_exists = true; 3306 if (PreserveAllAnnotations) { 3307 runtime_invisible_annotations_length = attribute_length; 3308 runtime_invisible_annotations = cfs->current(); 3309 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation"); 3310 } 3311 cfs->skip_u1(attribute_length, CHECK_0); 3312 3313 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 3314 if (runtime_visible_type_annotations != NULL) { 3315 classfile_parse_error( 3316 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0); 3317 } 3318 runtime_visible_type_annotations_length = attribute_length; 3319 runtime_visible_type_annotations = cfs->current(); 3320 3321 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation"); 3322 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); 3323 cfs->skip_u1_fast(runtime_visible_type_annotations_length); 3324 3325 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 3326 if (runtime_invisible_type_annotations_exists) { 3327 classfile_parse_error( 3328 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0); 3329 } 3330 runtime_invisible_type_annotations_exists = true; 3331 if (PreserveAllAnnotations) { 3332 runtime_invisible_type_annotations_length = attribute_length; 3333 runtime_invisible_type_annotations = cfs->current(); 3334 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation"); 3335 } 3336 cfs->skip_u1(attribute_length, CHECK_0); 3337 3338 } else { 3339 // Skip unknown attributes 3340 cfs->skip_u1(attribute_length, CHECK_0); 3341 } 3342 calculate_attr_size += attribute_length; 3343 } // End of attributes For loop 3344 3345 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations, 3346 runtime_visible_annotations_length, 3347 runtime_invisible_annotations, 3348 runtime_invisible_annotations_length, 3349 CHECK_0); 3350 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations, 3351 runtime_visible_type_annotations_length, 3352 runtime_invisible_type_annotations, 3353 runtime_invisible_type_annotations_length, 3354 CHECK_0); 3355 3356 RecordComponent* record_component = 3357 RecordComponent::allocate(_loader_data, name_index, descriptor_index, 3358 attributes_count, generic_sig_index, 3359 annotations, type_annotations, CHECK_0); 3360 record_components->at_put(x, record_component); 3361 } // End of component processing loop 3362 3363 // Restore buffer's current position. 3364 cfs->set_current(current_mark); 3365 return calculate_attr_size; 3366 } 3367 3368 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3369 set_class_synthetic_flag(true); 3370 } 3371 3372 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3373 assert(cfs != NULL, "invariant"); 3374 3375 const u2 signature_index = cfs->get_u2(CHECK); 3376 check_property( 3377 valid_symbol_at(signature_index), 3378 "Invalid constant pool index %u in Signature attribute in class file %s", 3379 signature_index, CHECK); 3380 set_class_generic_signature_index(signature_index); 3381 } 3382 3383 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3384 ConstantPool* cp, 3385 u4 attribute_byte_length, 3386 TRAPS) { 3387 assert(cfs != NULL, "invariant"); 3388 assert(cp != NULL, "invariant"); 3389 3390 const u1* const current_start = cfs->current(); 3391 3392 guarantee_property(attribute_byte_length >= sizeof(u2), 3393 "Invalid BootstrapMethods attribute length %u in class file %s", 3394 attribute_byte_length, 3395 CHECK); 3396 3397 cfs->guarantee_more(attribute_byte_length, CHECK); 3398 3399 const int attribute_array_length = cfs->get_u2_fast(); 3400 3401 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3402 "Short length on BootstrapMethods in class file %s", 3403 CHECK); 3404 3405 3406 // The attribute contains a counted array of counted tuples of shorts, 3407 // represending bootstrap specifiers: 3408 // length*{bootstrap_method_index, argument_count*{argument_index}} 3409 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3410 // operand_count = number of shorts in attr, except for leading length 3411 3412 // The attribute is copied into a short[] array. 3413 // The array begins with a series of short[2] pairs, one for each tuple. 3414 const int index_size = (attribute_array_length * 2); 3415 3416 Array<u2>* const operands = 3417 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3418 3419 // Eagerly assign operands so they will be deallocated with the constant 3420 // pool if there is an error. 3421 cp->set_operands(operands); 3422 3423 int operand_fill_index = index_size; 3424 const int cp_size = cp->length(); 3425 3426 for (int n = 0; n < attribute_array_length; n++) { 3427 // Store a 32-bit offset into the header of the operand array. 3428 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3429 3430 // Read a bootstrap specifier. 3431 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3432 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3433 const u2 argument_count = cfs->get_u2_fast(); 3434 check_property( 3435 valid_cp_range(bootstrap_method_index, cp_size) && 3436 cp->tag_at(bootstrap_method_index).is_method_handle(), 3437 "bootstrap_method_index %u has bad constant type in class file %s", 3438 bootstrap_method_index, 3439 CHECK); 3440 3441 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3442 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3443 CHECK); 3444 3445 operands->at_put(operand_fill_index++, bootstrap_method_index); 3446 operands->at_put(operand_fill_index++, argument_count); 3447 3448 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3449 for (int j = 0; j < argument_count; j++) { 3450 const u2 argument_index = cfs->get_u2_fast(); 3451 check_property( 3452 valid_cp_range(argument_index, cp_size) && 3453 cp->tag_at(argument_index).is_loadable_constant(), 3454 "argument_index %u has bad constant type in class file %s", 3455 argument_index, 3456 CHECK); 3457 operands->at_put(operand_fill_index++, argument_index); 3458 } 3459 } 3460 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3461 "Bad length on BootstrapMethods in class file %s", 3462 CHECK); 3463 } 3464 3465 bool ClassFileParser::supports_records() { 3466 return _major_version == JVM_CLASSFILE_MAJOR_VERSION && 3467 _minor_version == JAVA_PREVIEW_MINOR_VERSION && 3468 Arguments::enable_preview(); 3469 } 3470 3471 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3472 ConstantPool* cp, 3473 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3474 TRAPS) { 3475 assert(cfs != NULL, "invariant"); 3476 assert(cp != NULL, "invariant"); 3477 assert(parsed_annotations != NULL, "invariant"); 3478 3479 // Set inner classes attribute to default sentinel 3480 _inner_classes = Universe::the_empty_short_array(); 3481 // Set nest members attribute to default sentinel 3482 _nest_members = Universe::the_empty_short_array(); 3483 cfs->guarantee_more(2, CHECK); // attributes_count 3484 u2 attributes_count = cfs->get_u2_fast(); 3485 bool parsed_sourcefile_attribute = false; 3486 bool parsed_innerclasses_attribute = false; 3487 bool parsed_nest_members_attribute = false; 3488 bool parsed_nest_host_attribute = false; 3489 bool parsed_record_attribute = false; 3490 bool parsed_enclosingmethod_attribute = false; 3491 bool parsed_bootstrap_methods_attribute = false; 3492 const u1* runtime_visible_annotations = NULL; 3493 int runtime_visible_annotations_length = 0; 3494 const u1* runtime_invisible_annotations = NULL; 3495 int runtime_invisible_annotations_length = 0; 3496 const u1* runtime_visible_type_annotations = NULL; 3497 int runtime_visible_type_annotations_length = 0; 3498 const u1* runtime_invisible_type_annotations = NULL; 3499 int runtime_invisible_type_annotations_length = 0; 3500 bool runtime_invisible_type_annotations_exists = false; 3501 bool runtime_invisible_annotations_exists = false; 3502 bool parsed_source_debug_ext_annotations_exist = false; 3503 const u1* inner_classes_attribute_start = NULL; 3504 u4 inner_classes_attribute_length = 0; 3505 u2 enclosing_method_class_index = 0; 3506 u2 enclosing_method_method_index = 0; 3507 const u1* nest_members_attribute_start = NULL; 3508 u4 nest_members_attribute_length = 0; 3509 const u1* record_attribute_start = NULL; 3510 u4 record_attribute_length = 0; 3511 3512 // Iterate over attributes 3513 while (attributes_count--) { 3514 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3515 const u2 attribute_name_index = cfs->get_u2_fast(); 3516 const u4 attribute_length = cfs->get_u4_fast(); 3517 check_property( 3518 valid_symbol_at(attribute_name_index), 3519 "Attribute name has bad constant pool index %u in class file %s", 3520 attribute_name_index, CHECK); 3521 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3522 if (tag == vmSymbols::tag_source_file()) { 3523 // Check for SourceFile tag 3524 if (_need_verify) { 3525 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3526 } 3527 if (parsed_sourcefile_attribute) { 3528 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3529 } else { 3530 parsed_sourcefile_attribute = true; 3531 } 3532 parse_classfile_sourcefile_attribute(cfs, CHECK); 3533 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3534 // Check for SourceDebugExtension tag 3535 if (parsed_source_debug_ext_annotations_exist) { 3536 classfile_parse_error( 3537 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3538 } 3539 parsed_source_debug_ext_annotations_exist = true; 3540 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3541 } else if (tag == vmSymbols::tag_inner_classes()) { 3542 // Check for InnerClasses tag 3543 if (parsed_innerclasses_attribute) { 3544 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3545 } else { 3546 parsed_innerclasses_attribute = true; 3547 } 3548 inner_classes_attribute_start = cfs->current(); 3549 inner_classes_attribute_length = attribute_length; 3550 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3551 } else if (tag == vmSymbols::tag_synthetic()) { 3552 // Check for Synthetic tag 3553 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3554 if (attribute_length != 0) { 3555 classfile_parse_error( 3556 "Invalid Synthetic classfile attribute length %u in class file %s", 3557 attribute_length, CHECK); 3558 } 3559 parse_classfile_synthetic_attribute(CHECK); 3560 } else if (tag == vmSymbols::tag_deprecated()) { 3561 // Check for Deprecatd tag - 4276120 3562 if (attribute_length != 0) { 3563 classfile_parse_error( 3564 "Invalid Deprecated classfile attribute length %u in class file %s", 3565 attribute_length, CHECK); 3566 } 3567 } else if (_major_version >= JAVA_1_5_VERSION) { 3568 if (tag == vmSymbols::tag_signature()) { 3569 if (_generic_signature_index != 0) { 3570 classfile_parse_error( 3571 "Multiple Signature attributes in class file %s", CHECK); 3572 } 3573 if (attribute_length != 2) { 3574 classfile_parse_error( 3575 "Wrong Signature attribute length %u in class file %s", 3576 attribute_length, CHECK); 3577 } 3578 parse_classfile_signature_attribute(cfs, CHECK); 3579 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3580 if (runtime_visible_annotations != NULL) { 3581 classfile_parse_error( 3582 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3583 } 3584 runtime_visible_annotations_length = attribute_length; 3585 runtime_visible_annotations = cfs->current(); 3586 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3587 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3588 parse_annotations(cp, 3589 runtime_visible_annotations, 3590 runtime_visible_annotations_length, 3591 parsed_annotations, 3592 _loader_data, 3593 CHECK); 3594 cfs->skip_u1_fast(runtime_visible_annotations_length); 3595 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3596 if (runtime_invisible_annotations_exists) { 3597 classfile_parse_error( 3598 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3599 } 3600 runtime_invisible_annotations_exists = true; 3601 if (PreserveAllAnnotations) { 3602 runtime_invisible_annotations_length = attribute_length; 3603 runtime_invisible_annotations = cfs->current(); 3604 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3605 } 3606 cfs->skip_u1(attribute_length, CHECK); 3607 } else if (tag == vmSymbols::tag_enclosing_method()) { 3608 if (parsed_enclosingmethod_attribute) { 3609 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3610 } else { 3611 parsed_enclosingmethod_attribute = true; 3612 } 3613 guarantee_property(attribute_length == 4, 3614 "Wrong EnclosingMethod attribute length %u in class file %s", 3615 attribute_length, CHECK); 3616 cfs->guarantee_more(4, CHECK); // class_index, method_index 3617 enclosing_method_class_index = cfs->get_u2_fast(); 3618 enclosing_method_method_index = cfs->get_u2_fast(); 3619 if (enclosing_method_class_index == 0) { 3620 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3621 } 3622 // Validate the constant pool indices and types 3623 check_property(valid_klass_reference_at(enclosing_method_class_index), 3624 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3625 if (enclosing_method_method_index != 0 && 3626 (!cp->is_within_bounds(enclosing_method_method_index) || 3627 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3628 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3629 } 3630 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3631 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3632 if (parsed_bootstrap_methods_attribute) { 3633 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3634 } 3635 parsed_bootstrap_methods_attribute = true; 3636 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3637 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3638 if (runtime_visible_type_annotations != NULL) { 3639 classfile_parse_error( 3640 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3641 } 3642 runtime_visible_type_annotations_length = attribute_length; 3643 runtime_visible_type_annotations = cfs->current(); 3644 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3645 // No need for the VM to parse Type annotations 3646 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3647 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3648 if (runtime_invisible_type_annotations_exists) { 3649 classfile_parse_error( 3650 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3651 } else { 3652 runtime_invisible_type_annotations_exists = true; 3653 } 3654 if (PreserveAllAnnotations) { 3655 runtime_invisible_type_annotations_length = attribute_length; 3656 runtime_invisible_type_annotations = cfs->current(); 3657 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3658 } 3659 cfs->skip_u1(attribute_length, CHECK); 3660 } else if (_major_version >= JAVA_11_VERSION) { 3661 if (tag == vmSymbols::tag_nest_members()) { 3662 // Check for NestMembers tag 3663 if (parsed_nest_members_attribute) { 3664 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK); 3665 } else { 3666 parsed_nest_members_attribute = true; 3667 } 3668 if (parsed_nest_host_attribute) { 3669 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK); 3670 } 3671 nest_members_attribute_start = cfs->current(); 3672 nest_members_attribute_length = attribute_length; 3673 cfs->skip_u1(nest_members_attribute_length, CHECK); 3674 } else if (tag == vmSymbols::tag_nest_host()) { 3675 if (parsed_nest_host_attribute) { 3676 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK); 3677 } else { 3678 parsed_nest_host_attribute = true; 3679 } 3680 if (parsed_nest_members_attribute) { 3681 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK); 3682 } 3683 if (_need_verify) { 3684 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3685 } 3686 cfs->guarantee_more(2, CHECK); 3687 u2 class_info_index = cfs->get_u2_fast(); 3688 check_property( 3689 valid_klass_reference_at(class_info_index), 3690 "Nest-host class_info_index %u has bad constant type in class file %s", 3691 class_info_index, CHECK); 3692 _nest_host = class_info_index; 3693 } else if (_major_version >= JAVA_14_VERSION) { 3694 if (tag == vmSymbols::tag_record()) { 3695 // Skip over Record attribute if not supported or if super class is 3696 // not java.lang.Record. 3697 if (supports_records() && 3698 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) { 3699 if (parsed_record_attribute) { 3700 classfile_parse_error("Multiple Record attributes in class file %s", CHECK); 3701 } 3702 // Check that class is final and not abstract. 3703 if (!_access_flags.is_final() || _access_flags.is_abstract()) { 3704 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK); 3705 } 3706 parsed_record_attribute = true; 3707 record_attribute_start = cfs->current(); 3708 record_attribute_length = attribute_length; 3709 } else if (log_is_enabled(Info, class, record)) { 3710 // Log why the Record attribute was ignored. Note that if the 3711 // class file version is JVM_CLASSFILE_MAJOR_VERSION.65535 and 3712 // --enable-preview wasn't specified then a java.lang.UnsupportedClassVersionError 3713 // exception would have been thrown. 3714 ResourceMark rm(THREAD); 3715 if (supports_records()) { 3716 log_info(class, record)( 3717 "Ignoring Record attribute in class %s because super type is not java.lang.Record", 3718 _class_name->as_C_string()); 3719 } else { 3720 log_info(class, record)( 3721 "Ignoring Record attribute in class %s because class file version is not %d.65535", 3722 _class_name->as_C_string(), JVM_CLASSFILE_MAJOR_VERSION); 3723 } 3724 } 3725 cfs->skip_u1(attribute_length, CHECK); 3726 } else { 3727 // Unknown attribute 3728 cfs->skip_u1(attribute_length, CHECK); 3729 } 3730 } else { 3731 // Unknown attribute 3732 cfs->skip_u1(attribute_length, CHECK); 3733 } 3734 } else { 3735 // Unknown attribute 3736 cfs->skip_u1(attribute_length, CHECK); 3737 } 3738 } else { 3739 // Unknown attribute 3740 cfs->skip_u1(attribute_length, CHECK); 3741 } 3742 } 3743 _class_annotations = assemble_annotations(runtime_visible_annotations, 3744 runtime_visible_annotations_length, 3745 runtime_invisible_annotations, 3746 runtime_invisible_annotations_length, 3747 CHECK); 3748 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations, 3749 runtime_visible_type_annotations_length, 3750 runtime_invisible_type_annotations, 3751 runtime_invisible_type_annotations_length, 3752 CHECK); 3753 3754 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3755 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3756 cfs, 3757 inner_classes_attribute_start, 3758 parsed_innerclasses_attribute, 3759 enclosing_method_class_index, 3760 enclosing_method_method_index, 3761 CHECK); 3762 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3763 guarantee_property( 3764 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3765 "Wrong InnerClasses attribute length in class file %s", CHECK); 3766 } 3767 } 3768 3769 if (parsed_nest_members_attribute) { 3770 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3771 cfs, 3772 nest_members_attribute_start, 3773 CHECK); 3774 if (_need_verify) { 3775 guarantee_property( 3776 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3777 "Wrong NestMembers attribute length in class file %s", CHECK); 3778 } 3779 } 3780 3781 if (parsed_record_attribute) { 3782 const unsigned int calculated_attr_length = parse_classfile_record_attribute( 3783 cfs, 3784 cp, 3785 record_attribute_start, 3786 CHECK); 3787 if (_need_verify) { 3788 guarantee_property(record_attribute_length == calculated_attr_length, 3789 "Record attribute has wrong length in class file %s", 3790 CHECK); 3791 } 3792 } 3793 3794 if (_max_bootstrap_specifier_index >= 0) { 3795 guarantee_property(parsed_bootstrap_methods_attribute, 3796 "Missing BootstrapMethods attribute in class file %s", CHECK); 3797 } 3798 } 3799 3800 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3801 assert(k != NULL, "invariant"); 3802 3803 if (_synthetic_flag) 3804 k->set_is_synthetic(); 3805 if (_sourcefile_index != 0) { 3806 k->set_source_file_name_index(_sourcefile_index); 3807 } 3808 if (_generic_signature_index != 0) { 3809 k->set_generic_signature_index(_generic_signature_index); 3810 } 3811 if (_sde_buffer != NULL) { 3812 k->set_source_debug_extension(_sde_buffer, _sde_length); 3813 } 3814 } 3815 3816 // Create the Annotations object that will 3817 // hold the annotations array for the Klass. 3818 void ClassFileParser::create_combined_annotations(TRAPS) { 3819 if (_class_annotations == NULL && 3820 _class_type_annotations == NULL && 3821 _fields_annotations == NULL && 3822 _fields_type_annotations == NULL) { 3823 // Don't create the Annotations object unnecessarily. 3824 return; 3825 } 3826 3827 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3828 annotations->set_class_annotations(_class_annotations); 3829 annotations->set_class_type_annotations(_class_type_annotations); 3830 annotations->set_fields_annotations(_fields_annotations); 3831 annotations->set_fields_type_annotations(_fields_type_annotations); 3832 3833 // This is the Annotations object that will be 3834 // assigned to InstanceKlass being constructed. 3835 _combined_annotations = annotations; 3836 3837 // The annotations arrays below has been transfered the 3838 // _combined_annotations so these fields can now be cleared. 3839 _class_annotations = NULL; 3840 _class_type_annotations = NULL; 3841 _fields_annotations = NULL; 3842 _fields_type_annotations = NULL; 3843 } 3844 3845 // Transfer ownership of metadata allocated to the InstanceKlass. 3846 void ClassFileParser::apply_parsed_class_metadata( 3847 InstanceKlass* this_klass, 3848 int java_fields_count, 3849 TRAPS) { 3850 assert(this_klass != NULL, "invariant"); 3851 3852 _cp->set_pool_holder(this_klass); 3853 this_klass->set_constants(_cp); 3854 this_klass->set_fields(_fields, java_fields_count); 3855 this_klass->set_methods(_methods); 3856 this_klass->set_inner_classes(_inner_classes); 3857 this_klass->set_nest_members(_nest_members); 3858 this_klass->set_nest_host_index(_nest_host); 3859 this_klass->set_local_interfaces(_local_interfaces); 3860 this_klass->set_annotations(_combined_annotations); 3861 this_klass->set_record_components(_record_components); 3862 // Delay the setting of _transitive_interfaces until after initialize_supers() in 3863 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with 3864 // its _super. If an OOM occurs while loading the current klass, its _super field 3865 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3866 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3867 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3868 3869 // Clear out these fields so they don't get deallocated by the destructor 3870 clear_class_metadata(); 3871 } 3872 3873 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3874 int runtime_visible_annotations_length, 3875 const u1* const runtime_invisible_annotations, 3876 int runtime_invisible_annotations_length, 3877 TRAPS) { 3878 AnnotationArray* annotations = NULL; 3879 if (runtime_visible_annotations != NULL || 3880 runtime_invisible_annotations != NULL) { 3881 annotations = MetadataFactory::new_array<u1>(_loader_data, 3882 runtime_visible_annotations_length + 3883 runtime_invisible_annotations_length, 3884 CHECK_(annotations)); 3885 if (runtime_visible_annotations != NULL) { 3886 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3887 annotations->at_put(i, runtime_visible_annotations[i]); 3888 } 3889 } 3890 if (runtime_invisible_annotations != NULL) { 3891 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3892 int append = runtime_visible_annotations_length+i; 3893 annotations->at_put(append, runtime_invisible_annotations[i]); 3894 } 3895 } 3896 } 3897 return annotations; 3898 } 3899 3900 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3901 const int super_class_index, 3902 const bool need_verify, 3903 TRAPS) { 3904 assert(cp != NULL, "invariant"); 3905 const InstanceKlass* super_klass = NULL; 3906 3907 if (super_class_index == 0) { 3908 check_property(_class_name == vmSymbols::java_lang_Object(), 3909 "Invalid superclass index %u in class file %s", 3910 super_class_index, 3911 CHECK_NULL); 3912 } else { 3913 check_property(valid_klass_reference_at(super_class_index), 3914 "Invalid superclass index %u in class file %s", 3915 super_class_index, 3916 CHECK_NULL); 3917 // The class name should be legal because it is checked when parsing constant pool. 3918 // However, make sure it is not an array type. 3919 bool is_array = false; 3920 if (cp->tag_at(super_class_index).is_klass()) { 3921 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3922 if (need_verify) 3923 is_array = super_klass->is_array_klass(); 3924 } else if (need_verify) { 3925 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY); 3926 } 3927 if (need_verify) { 3928 guarantee_property(!is_array, 3929 "Bad superclass name in class file %s", CHECK_NULL); 3930 } 3931 } 3932 return super_klass; 3933 } 3934 3935 static unsigned int compute_oop_map_count(const InstanceKlass* super, 3936 unsigned int nonstatic_oop_map_count, 3937 int first_nonstatic_oop_offset) { 3938 3939 unsigned int map_count = 3940 NULL == super ? 0 : super->nonstatic_oop_map_count(); 3941 if (nonstatic_oop_map_count > 0) { 3942 // We have oops to add to map 3943 if (map_count == 0) { 3944 map_count = nonstatic_oop_map_count; 3945 } 3946 else { 3947 // Check whether we should add a new map block or whether the last one can 3948 // be extended 3949 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3950 const OopMapBlock* const last_map = first_map + map_count - 1; 3951 3952 const int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3953 if (next_offset == first_nonstatic_oop_offset) { 3954 // There is no gap bettwen superklass's last oop field and first 3955 // local oop field, merge maps. 3956 nonstatic_oop_map_count -= 1; 3957 } 3958 else { 3959 // Superklass didn't end with a oop field, add extra maps 3960 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3961 } 3962 map_count += nonstatic_oop_map_count; 3963 } 3964 } 3965 return map_count; 3966 } 3967 3968 #ifndef PRODUCT 3969 static void print_field_layout(const Symbol* name, 3970 Array<u2>* fields, 3971 ConstantPool* cp, 3972 int instance_size, 3973 int instance_fields_start, 3974 int instance_fields_end, 3975 int static_fields_end) { 3976 3977 assert(name != NULL, "invariant"); 3978 3979 tty->print("%s: field layout\n", name->as_klass_external_name()); 3980 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3981 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3982 if (!fs.access_flags().is_static()) { 3983 tty->print(" @%3d \"%s\" %s\n", 3984 fs.offset(), 3985 fs.name()->as_klass_external_name(), 3986 fs.signature()->as_klass_external_name()); 3987 } 3988 } 3989 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3990 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3991 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3992 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3993 if (fs.access_flags().is_static()) { 3994 tty->print(" @%3d \"%s\" %s\n", 3995 fs.offset(), 3996 fs.name()->as_klass_external_name(), 3997 fs.signature()->as_klass_external_name()); 3998 } 3999 } 4000 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4001 tty->print("\n"); 4002 } 4003 #endif 4004 4005 // Values needed for oopmap and InstanceKlass creation 4006 class ClassFileParser::FieldLayoutInfo : public ResourceObj { 4007 public: 4008 int* nonstatic_oop_offsets; 4009 unsigned int* nonstatic_oop_counts; 4010 unsigned int nonstatic_oop_map_count; 4011 unsigned int total_oop_map_count; 4012 int instance_size; 4013 int nonstatic_field_size; 4014 int static_field_size; 4015 bool has_nonstatic_fields; 4016 }; 4017 4018 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 4019 void ClassFileParser::layout_fields(ConstantPool* cp, 4020 const FieldAllocationCount* fac, 4021 const ClassAnnotationCollector* parsed_annotations, 4022 FieldLayoutInfo* info, 4023 TRAPS) { 4024 4025 assert(cp != NULL, "invariant"); 4026 4027 // Field size and offset computation 4028 int nonstatic_field_size = _super_klass == NULL ? 0 : 4029 _super_klass->nonstatic_field_size(); 4030 4031 // Count the contended fields by type. 4032 // 4033 // We ignore static fields, because @Contended is not supported for them. 4034 // The layout code below will also ignore the static fields. 4035 int nonstatic_contended_count = 0; 4036 FieldAllocationCount fac_contended; 4037 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4038 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4039 if (fs.is_contended()) { 4040 fac_contended.count[atype]++; 4041 if (!fs.access_flags().is_static()) { 4042 nonstatic_contended_count++; 4043 } 4044 } 4045 } 4046 4047 4048 // Calculate the starting byte offsets 4049 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 4050 int next_static_double_offset = next_static_oop_offset + 4051 ((fac->count[STATIC_OOP]) * heapOopSize); 4052 if (fac->count[STATIC_DOUBLE]) { 4053 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 4054 } 4055 4056 int next_static_word_offset = next_static_double_offset + 4057 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 4058 int next_static_short_offset = next_static_word_offset + 4059 ((fac->count[STATIC_WORD]) * BytesPerInt); 4060 int next_static_byte_offset = next_static_short_offset + 4061 ((fac->count[STATIC_SHORT]) * BytesPerShort); 4062 4063 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 4064 nonstatic_field_size * heapOopSize; 4065 4066 int next_nonstatic_field_offset = nonstatic_fields_start; 4067 4068 const bool is_contended_class = parsed_annotations->is_contended(); 4069 4070 // Class is contended, pad before all the fields 4071 if (is_contended_class) { 4072 next_nonstatic_field_offset += ContendedPaddingWidth; 4073 } 4074 4075 // Compute the non-contended fields count. 4076 // The packing code below relies on these counts to determine if some field 4077 // can be squeezed into the alignment gap. Contended fields are obviously 4078 // exempt from that. 4079 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 4080 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 4081 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 4082 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 4083 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 4084 4085 // Total non-static fields count, including every contended field 4086 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 4087 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 4088 fac->count[NONSTATIC_OOP]; 4089 4090 const bool super_has_nonstatic_fields = 4091 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 4092 const bool has_nonstatic_fields = 4093 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 4094 4095 4096 // Prepare list of oops for oop map generation. 4097 // 4098 // "offset" and "count" lists are describing the set of contiguous oop 4099 // regions. offset[i] is the start of the i-th region, which then has 4100 // count[i] oops following. Before we know how many regions are required, 4101 // we pessimistically allocate the maps to fit all the oops into the 4102 // distinct regions. 4103 // 4104 // TODO: We add +1 to always allocate non-zero resource arrays; we need 4105 // to figure out if we still need to do this. 4106 unsigned int nonstatic_oop_map_count = 0; 4107 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 4108 4109 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 4110 THREAD, int, max_nonstatic_oop_maps); 4111 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 4112 THREAD, unsigned int, max_nonstatic_oop_maps); 4113 4114 int first_nonstatic_oop_offset = 0; // will be set for first oop field 4115 4116 bool compact_fields = true; 4117 bool allocate_oops_first = false; 4118 4119 // The next classes have predefined hard-coded fields offsets 4120 // (see in JavaClasses::compute_hard_coded_offsets()). 4121 // Use default fields allocation order for them. 4122 if (_loader_data->class_loader() == NULL && 4123 (_class_name == vmSymbols::java_lang_ref_Reference() || 4124 _class_name == vmSymbols::java_lang_Boolean() || 4125 _class_name == vmSymbols::java_lang_Character() || 4126 _class_name == vmSymbols::java_lang_Float() || 4127 _class_name == vmSymbols::java_lang_Double() || 4128 _class_name == vmSymbols::java_lang_Byte() || 4129 _class_name == vmSymbols::java_lang_Short() || 4130 _class_name == vmSymbols::java_lang_Integer() || 4131 _class_name == vmSymbols::java_lang_Long())) { 4132 allocate_oops_first = true; // Allocate oops first 4133 compact_fields = false; // Don't compact fields 4134 } 4135 4136 int next_nonstatic_oop_offset = 0; 4137 int next_nonstatic_double_offset = 0; 4138 4139 // Rearrange fields for a given allocation style 4140 if (allocate_oops_first) { 4141 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 4142 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4143 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4144 (nonstatic_oop_count * heapOopSize); 4145 } else { 4146 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 4147 next_nonstatic_double_offset = next_nonstatic_field_offset; 4148 } 4149 4150 int nonstatic_oop_space_count = 0; 4151 int nonstatic_word_space_count = 0; 4152 int nonstatic_short_space_count = 0; 4153 int nonstatic_byte_space_count = 0; 4154 int nonstatic_oop_space_offset = 0; 4155 int nonstatic_word_space_offset = 0; 4156 int nonstatic_short_space_offset = 0; 4157 int nonstatic_byte_space_offset = 0; 4158 4159 // Try to squeeze some of the fields into the gaps due to 4160 // long/double alignment. 4161 if (nonstatic_double_count > 0) { 4162 int offset = next_nonstatic_double_offset; 4163 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 4164 if (compact_fields && offset != next_nonstatic_double_offset) { 4165 // Allocate available fields into the gap before double field. 4166 int length = next_nonstatic_double_offset - offset; 4167 assert(length == BytesPerInt, ""); 4168 nonstatic_word_space_offset = offset; 4169 if (nonstatic_word_count > 0) { 4170 nonstatic_word_count -= 1; 4171 nonstatic_word_space_count = 1; // Only one will fit 4172 length -= BytesPerInt; 4173 offset += BytesPerInt; 4174 } 4175 nonstatic_short_space_offset = offset; 4176 while (length >= BytesPerShort && nonstatic_short_count > 0) { 4177 nonstatic_short_count -= 1; 4178 nonstatic_short_space_count += 1; 4179 length -= BytesPerShort; 4180 offset += BytesPerShort; 4181 } 4182 nonstatic_byte_space_offset = offset; 4183 while (length > 0 && nonstatic_byte_count > 0) { 4184 nonstatic_byte_count -= 1; 4185 nonstatic_byte_space_count += 1; 4186 length -= 1; 4187 } 4188 // Allocate oop field in the gap if there are no other fields for that. 4189 nonstatic_oop_space_offset = offset; 4190 if (length >= heapOopSize && nonstatic_oop_count > 0 && 4191 !allocate_oops_first) { // when oop fields not first 4192 nonstatic_oop_count -= 1; 4193 nonstatic_oop_space_count = 1; // Only one will fit 4194 length -= heapOopSize; 4195 offset += heapOopSize; 4196 } 4197 } 4198 } 4199 4200 int next_nonstatic_word_offset = next_nonstatic_double_offset + 4201 (nonstatic_double_count * BytesPerLong); 4202 int next_nonstatic_short_offset = next_nonstatic_word_offset + 4203 (nonstatic_word_count * BytesPerInt); 4204 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 4205 (nonstatic_short_count * BytesPerShort); 4206 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 4207 nonstatic_byte_count; 4208 4209 // let oops jump before padding with this allocation style 4210 if (!allocate_oops_first) { 4211 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 4212 if( nonstatic_oop_count > 0 ) { 4213 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 4214 } 4215 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 4216 } 4217 4218 // Iterate over fields again and compute correct offsets. 4219 // The field allocation type was temporarily stored in the offset slot. 4220 // oop fields are located before non-oop fields (static and non-static). 4221 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4222 4223 // skip already laid out fields 4224 if (fs.is_offset_set()) continue; 4225 4226 // contended instance fields are handled below 4227 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 4228 4229 int real_offset = 0; 4230 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4231 4232 // pack the rest of the fields 4233 switch (atype) { 4234 case STATIC_OOP: 4235 real_offset = next_static_oop_offset; 4236 next_static_oop_offset += heapOopSize; 4237 break; 4238 case STATIC_BYTE: 4239 real_offset = next_static_byte_offset; 4240 next_static_byte_offset += 1; 4241 break; 4242 case STATIC_SHORT: 4243 real_offset = next_static_short_offset; 4244 next_static_short_offset += BytesPerShort; 4245 break; 4246 case STATIC_WORD: 4247 real_offset = next_static_word_offset; 4248 next_static_word_offset += BytesPerInt; 4249 break; 4250 case STATIC_DOUBLE: 4251 real_offset = next_static_double_offset; 4252 next_static_double_offset += BytesPerLong; 4253 break; 4254 case NONSTATIC_OOP: 4255 if( nonstatic_oop_space_count > 0 ) { 4256 real_offset = nonstatic_oop_space_offset; 4257 nonstatic_oop_space_offset += heapOopSize; 4258 nonstatic_oop_space_count -= 1; 4259 } else { 4260 real_offset = next_nonstatic_oop_offset; 4261 next_nonstatic_oop_offset += heapOopSize; 4262 } 4263 4264 // Record this oop in the oop maps 4265 if( nonstatic_oop_map_count > 0 && 4266 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4267 real_offset - 4268 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4269 heapOopSize ) { 4270 // This oop is adjacent to the previous one, add to current oop map 4271 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4272 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4273 } else { 4274 // This oop is not adjacent to the previous one, create new oop map 4275 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4276 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4277 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4278 nonstatic_oop_map_count += 1; 4279 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4280 first_nonstatic_oop_offset = real_offset; 4281 } 4282 } 4283 break; 4284 case NONSTATIC_BYTE: 4285 if( nonstatic_byte_space_count > 0 ) { 4286 real_offset = nonstatic_byte_space_offset; 4287 nonstatic_byte_space_offset += 1; 4288 nonstatic_byte_space_count -= 1; 4289 } else { 4290 real_offset = next_nonstatic_byte_offset; 4291 next_nonstatic_byte_offset += 1; 4292 } 4293 break; 4294 case NONSTATIC_SHORT: 4295 if( nonstatic_short_space_count > 0 ) { 4296 real_offset = nonstatic_short_space_offset; 4297 nonstatic_short_space_offset += BytesPerShort; 4298 nonstatic_short_space_count -= 1; 4299 } else { 4300 real_offset = next_nonstatic_short_offset; 4301 next_nonstatic_short_offset += BytesPerShort; 4302 } 4303 break; 4304 case NONSTATIC_WORD: 4305 if( nonstatic_word_space_count > 0 ) { 4306 real_offset = nonstatic_word_space_offset; 4307 nonstatic_word_space_offset += BytesPerInt; 4308 nonstatic_word_space_count -= 1; 4309 } else { 4310 real_offset = next_nonstatic_word_offset; 4311 next_nonstatic_word_offset += BytesPerInt; 4312 } 4313 break; 4314 case NONSTATIC_DOUBLE: 4315 real_offset = next_nonstatic_double_offset; 4316 next_nonstatic_double_offset += BytesPerLong; 4317 break; 4318 default: 4319 ShouldNotReachHere(); 4320 } 4321 fs.set_offset(real_offset); 4322 } 4323 4324 4325 // Handle the contended cases. 4326 // 4327 // Each contended field should not intersect the cache line with another contended field. 4328 // In the absence of alignment information, we end up with pessimistically separating 4329 // the fields with full-width padding. 4330 // 4331 // Additionally, this should not break alignment for the fields, so we round the alignment up 4332 // for each field. 4333 if (nonstatic_contended_count > 0) { 4334 4335 // if there is at least one contended field, we need to have pre-padding for them 4336 next_nonstatic_padded_offset += ContendedPaddingWidth; 4337 4338 // collect all contended groups 4339 ResourceBitMap bm(cp->size()); 4340 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4341 // skip already laid out fields 4342 if (fs.is_offset_set()) continue; 4343 4344 if (fs.is_contended()) { 4345 bm.set_bit(fs.contended_group()); 4346 } 4347 } 4348 4349 int current_group = -1; 4350 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4351 4352 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4353 4354 // skip already laid out fields 4355 if (fs.is_offset_set()) continue; 4356 4357 // skip non-contended fields and fields from different group 4358 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4359 4360 // handle statics below 4361 if (fs.access_flags().is_static()) continue; 4362 4363 int real_offset = 0; 4364 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4365 4366 switch (atype) { 4367 case NONSTATIC_BYTE: 4368 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4369 real_offset = next_nonstatic_padded_offset; 4370 next_nonstatic_padded_offset += 1; 4371 break; 4372 4373 case NONSTATIC_SHORT: 4374 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4375 real_offset = next_nonstatic_padded_offset; 4376 next_nonstatic_padded_offset += BytesPerShort; 4377 break; 4378 4379 case NONSTATIC_WORD: 4380 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4381 real_offset = next_nonstatic_padded_offset; 4382 next_nonstatic_padded_offset += BytesPerInt; 4383 break; 4384 4385 case NONSTATIC_DOUBLE: 4386 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4387 real_offset = next_nonstatic_padded_offset; 4388 next_nonstatic_padded_offset += BytesPerLong; 4389 break; 4390 4391 case NONSTATIC_OOP: 4392 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4393 real_offset = next_nonstatic_padded_offset; 4394 next_nonstatic_padded_offset += heapOopSize; 4395 4396 // Record this oop in the oop maps 4397 if( nonstatic_oop_map_count > 0 && 4398 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4399 real_offset - 4400 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4401 heapOopSize ) { 4402 // This oop is adjacent to the previous one, add to current oop map 4403 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4404 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4405 } else { 4406 // This oop is not adjacent to the previous one, create new oop map 4407 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4408 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4409 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4410 nonstatic_oop_map_count += 1; 4411 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4412 first_nonstatic_oop_offset = real_offset; 4413 } 4414 } 4415 break; 4416 4417 default: 4418 ShouldNotReachHere(); 4419 } 4420 4421 if (fs.contended_group() == 0) { 4422 // Contended group defines the equivalence class over the fields: 4423 // the fields within the same contended group are not inter-padded. 4424 // The only exception is default group, which does not incur the 4425 // equivalence, and so requires intra-padding. 4426 next_nonstatic_padded_offset += ContendedPaddingWidth; 4427 } 4428 4429 fs.set_offset(real_offset); 4430 } // for 4431 4432 // Start laying out the next group. 4433 // Note that this will effectively pad the last group in the back; 4434 // this is expected to alleviate memory contention effects for 4435 // subclass fields and/or adjacent object. 4436 // If this was the default group, the padding is already in place. 4437 if (current_group != 0) { 4438 next_nonstatic_padded_offset += ContendedPaddingWidth; 4439 } 4440 } 4441 4442 // handle static fields 4443 } 4444 4445 // Entire class is contended, pad in the back. 4446 // This helps to alleviate memory contention effects for subclass fields 4447 // and/or adjacent object. 4448 if (is_contended_class) { 4449 next_nonstatic_padded_offset += ContendedPaddingWidth; 4450 } 4451 4452 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4453 4454 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize); 4455 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4456 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4457 4458 int static_field_size = (static_fields_end - 4459 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4460 nonstatic_field_size = nonstatic_field_size + 4461 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4462 4463 int instance_size = align_object_size(instance_end / wordSize); 4464 4465 assert(instance_size == align_object_size(align_up( 4466 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 4467 wordSize) / wordSize), "consistent layout helper value"); 4468 4469 // Invariant: nonstatic_field end/start should only change if there are 4470 // nonstatic fields in the class, or if the class is contended. We compare 4471 // against the non-aligned value, so that end alignment will not fail the 4472 // assert without actually having the fields. 4473 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4474 is_contended_class || 4475 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4476 4477 // Number of non-static oop map blocks allocated at end of klass. 4478 const unsigned int total_oop_map_count = 4479 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 4480 first_nonstatic_oop_offset); 4481 4482 #ifndef PRODUCT 4483 if (PrintFieldLayout) { 4484 print_field_layout(_class_name, 4485 _fields, 4486 cp, 4487 instance_size, 4488 nonstatic_fields_start, 4489 nonstatic_fields_end, 4490 static_fields_end); 4491 } 4492 4493 #endif 4494 // Pass back information needed for InstanceKlass creation 4495 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 4496 info->nonstatic_oop_counts = nonstatic_oop_counts; 4497 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 4498 info->total_oop_map_count = total_oop_map_count; 4499 info->instance_size = instance_size; 4500 info->static_field_size = static_field_size; 4501 info->nonstatic_field_size = nonstatic_field_size; 4502 info->has_nonstatic_fields = has_nonstatic_fields; 4503 } 4504 4505 static void fill_oop_maps(const InstanceKlass* k, 4506 unsigned int nonstatic_oop_map_count, 4507 const int* nonstatic_oop_offsets, 4508 const unsigned int* nonstatic_oop_counts) { 4509 4510 assert(k != NULL, "invariant"); 4511 4512 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4513 const InstanceKlass* const super = k->superklass(); 4514 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4515 if (super_count > 0) { 4516 // Copy maps from superklass 4517 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4518 for (unsigned int i = 0; i < super_count; ++i) { 4519 *this_oop_map++ = *super_oop_map++; 4520 } 4521 } 4522 4523 if (nonstatic_oop_map_count > 0) { 4524 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4525 // The counts differ because there is no gap between superklass's last oop 4526 // field and the first local oop field. Extend the last oop map copied 4527 // from the superklass instead of creating new one. 4528 nonstatic_oop_map_count--; 4529 nonstatic_oop_offsets++; 4530 this_oop_map--; 4531 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4532 this_oop_map++; 4533 } 4534 4535 // Add new map blocks, fill them 4536 while (nonstatic_oop_map_count-- > 0) { 4537 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4538 this_oop_map->set_count(*nonstatic_oop_counts++); 4539 this_oop_map++; 4540 } 4541 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4542 this_oop_map, "sanity"); 4543 } 4544 } 4545 4546 4547 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4548 assert(ik != NULL, "invariant"); 4549 4550 const Klass* const super = ik->super(); 4551 4552 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4553 // in which case we don't have to register objects as finalizable 4554 if (!_has_empty_finalizer) { 4555 if (_has_finalizer || 4556 (super != NULL && super->has_finalizer())) { 4557 ik->set_has_finalizer(); 4558 } 4559 } 4560 4561 #ifdef ASSERT 4562 bool f = false; 4563 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4564 vmSymbols::void_method_signature()); 4565 if (m != NULL && !m->is_empty_method()) { 4566 f = true; 4567 } 4568 4569 // Spec doesn't prevent agent from redefinition of empty finalizer. 4570 // Despite the fact that it's generally bad idea and redefined finalizer 4571 // will not work as expected we shouldn't abort vm in this case 4572 if (!ik->has_redefined_this_or_super()) { 4573 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4574 } 4575 #endif 4576 4577 // Check if this klass supports the java.lang.Cloneable interface 4578 if (SystemDictionary::Cloneable_klass_loaded()) { 4579 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4580 ik->set_is_cloneable(); 4581 } 4582 } 4583 4584 // Check if this klass has a vanilla default constructor 4585 if (super == NULL) { 4586 // java.lang.Object has empty default constructor 4587 ik->set_has_vanilla_constructor(); 4588 } else { 4589 if (super->has_vanilla_constructor() && 4590 _has_vanilla_constructor) { 4591 ik->set_has_vanilla_constructor(); 4592 } 4593 #ifdef ASSERT 4594 bool v = false; 4595 if (super->has_vanilla_constructor()) { 4596 const Method* const constructor = 4597 ik->find_method(vmSymbols::object_initializer_name(), 4598 vmSymbols::void_method_signature()); 4599 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4600 v = true; 4601 } 4602 } 4603 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4604 #endif 4605 } 4606 4607 // If it cannot be fast-path allocated, set a bit in the layout helper. 4608 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4609 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4610 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4611 || ik->is_abstract() || ik->is_interface() 4612 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4613 || ik->size_helper() >= FastAllocateSizeLimit) { 4614 // Forbid fast-path allocation. 4615 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4616 ik->set_layout_helper(lh); 4617 } 4618 } 4619 4620 // utility methods for appending an array with check for duplicates 4621 4622 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4623 const Array<InstanceKlass*>* const ifs) { 4624 // iterate over new interfaces 4625 for (int i = 0; i < ifs->length(); i++) { 4626 InstanceKlass* const e = ifs->at(i); 4627 assert(e->is_klass() && e->is_interface(), "just checking"); 4628 // add new interface 4629 result->append_if_missing(e); 4630 } 4631 } 4632 4633 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4634 Array<InstanceKlass*>* local_ifs, 4635 ClassLoaderData* loader_data, 4636 TRAPS) { 4637 assert(local_ifs != NULL, "invariant"); 4638 assert(loader_data != NULL, "invariant"); 4639 4640 // Compute maximum size for transitive interfaces 4641 int max_transitive_size = 0; 4642 int super_size = 0; 4643 // Add superclass transitive interfaces size 4644 if (super != NULL) { 4645 super_size = super->transitive_interfaces()->length(); 4646 max_transitive_size += super_size; 4647 } 4648 // Add local interfaces' super interfaces 4649 const int local_size = local_ifs->length(); 4650 for (int i = 0; i < local_size; i++) { 4651 InstanceKlass* const l = local_ifs->at(i); 4652 max_transitive_size += l->transitive_interfaces()->length(); 4653 } 4654 // Finally add local interfaces 4655 max_transitive_size += local_size; 4656 // Construct array 4657 if (max_transitive_size == 0) { 4658 // no interfaces, use canonicalized array 4659 return Universe::the_empty_instance_klass_array(); 4660 } else if (max_transitive_size == super_size) { 4661 // no new local interfaces added, share superklass' transitive interface array 4662 return super->transitive_interfaces(); 4663 } else if (max_transitive_size == local_size) { 4664 // only local interfaces added, share local interface array 4665 return local_ifs; 4666 } else { 4667 ResourceMark rm; 4668 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4669 4670 // Copy down from superclass 4671 if (super != NULL) { 4672 append_interfaces(result, super->transitive_interfaces()); 4673 } 4674 4675 // Copy down from local interfaces' superinterfaces 4676 for (int i = 0; i < local_size; i++) { 4677 InstanceKlass* const l = local_ifs->at(i); 4678 append_interfaces(result, l->transitive_interfaces()); 4679 } 4680 // Finally add local interfaces 4681 append_interfaces(result, local_ifs); 4682 4683 // length will be less than the max_transitive_size if duplicates were removed 4684 const int length = result->length(); 4685 assert(length <= max_transitive_size, "just checking"); 4686 Array<InstanceKlass*>* const new_result = 4687 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4688 for (int i = 0; i < length; i++) { 4689 InstanceKlass* const e = result->at(i); 4690 assert(e != NULL, "just checking"); 4691 new_result->at_put(i, e); 4692 } 4693 return new_result; 4694 } 4695 } 4696 4697 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4698 assert(this_klass != NULL, "invariant"); 4699 const Klass* const super = this_klass->super(); 4700 4701 if (super != NULL) { 4702 4703 // If the loader is not the boot loader then throw an exception if its 4704 // superclass is in package jdk.internal.reflect and its loader is not a 4705 // special reflection class loader 4706 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4707 assert(super->is_instance_klass(), "super is not instance klass"); 4708 PackageEntry* super_package = super->package(); 4709 if (super_package != NULL && 4710 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4711 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4712 ResourceMark rm(THREAD); 4713 Exceptions::fthrow( 4714 THREAD_AND_LOCATION, 4715 vmSymbols::java_lang_IllegalAccessError(), 4716 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4717 this_klass->external_name(), 4718 this_klass->class_loader_data()->loader_name_and_id(), 4719 super->external_name()); 4720 return; 4721 } 4722 } 4723 4724 Reflection::VerifyClassAccessResults vca_result = 4725 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4726 if (vca_result != Reflection::ACCESS_OK) { 4727 ResourceMark rm(THREAD); 4728 char* msg = Reflection::verify_class_access_msg(this_klass, 4729 InstanceKlass::cast(super), 4730 vca_result); 4731 if (msg == NULL) { 4732 bool same_module = (this_klass->module() == super->module()); 4733 Exceptions::fthrow( 4734 THREAD_AND_LOCATION, 4735 vmSymbols::java_lang_IllegalAccessError(), 4736 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4737 this_klass->external_name(), 4738 super->is_abstract() ? "abstract " : "", 4739 super->external_name(), 4740 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4741 (same_module) ? "" : "; ", 4742 (same_module) ? "" : super->class_in_module_of_loader()); 4743 } else { 4744 // Add additional message content. 4745 Exceptions::fthrow( 4746 THREAD_AND_LOCATION, 4747 vmSymbols::java_lang_IllegalAccessError(), 4748 "superclass access check failed: %s", 4749 msg); 4750 } 4751 } 4752 } 4753 } 4754 4755 4756 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4757 assert(this_klass != NULL, "invariant"); 4758 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4759 const int lng = local_interfaces->length(); 4760 for (int i = lng - 1; i >= 0; i--) { 4761 InstanceKlass* const k = local_interfaces->at(i); 4762 assert (k != NULL && k->is_interface(), "invalid interface"); 4763 Reflection::VerifyClassAccessResults vca_result = 4764 Reflection::verify_class_access(this_klass, k, false); 4765 if (vca_result != Reflection::ACCESS_OK) { 4766 ResourceMark rm(THREAD); 4767 char* msg = Reflection::verify_class_access_msg(this_klass, 4768 k, 4769 vca_result); 4770 if (msg == NULL) { 4771 bool same_module = (this_klass->module() == k->module()); 4772 Exceptions::fthrow( 4773 THREAD_AND_LOCATION, 4774 vmSymbols::java_lang_IllegalAccessError(), 4775 "class %s cannot access its superinterface %s (%s%s%s)", 4776 this_klass->external_name(), 4777 k->external_name(), 4778 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4779 (same_module) ? "" : "; ", 4780 (same_module) ? "" : k->class_in_module_of_loader()); 4781 } else { 4782 // Add additional message content. 4783 Exceptions::fthrow( 4784 THREAD_AND_LOCATION, 4785 vmSymbols::java_lang_IllegalAccessError(), 4786 "superinterface check failed: %s", 4787 msg); 4788 } 4789 } 4790 } 4791 } 4792 4793 4794 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4795 assert(this_klass != NULL, "invariant"); 4796 const Array<Method*>* const methods = this_klass->methods(); 4797 const int num_methods = methods->length(); 4798 4799 // go thru each method and check if it overrides a final method 4800 for (int index = 0; index < num_methods; index++) { 4801 const Method* const m = methods->at(index); 4802 4803 // skip private, static, and <init> methods 4804 if ((!m->is_private() && !m->is_static()) && 4805 (m->name() != vmSymbols::object_initializer_name())) { 4806 4807 const Symbol* const name = m->name(); 4808 const Symbol* const signature = m->signature(); 4809 const Klass* k = this_klass->super(); 4810 const Method* super_m = NULL; 4811 while (k != NULL) { 4812 // skip supers that don't have final methods. 4813 if (k->has_final_method()) { 4814 // lookup a matching method in the super class hierarchy 4815 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4816 if (super_m == NULL) { 4817 break; // didn't find any match; get out 4818 } 4819 4820 if (super_m->is_final() && !super_m->is_static() && 4821 !super_m->access_flags().is_private()) { 4822 // matching method in super is final, and not static or private 4823 bool can_access = Reflection::verify_member_access(this_klass, 4824 super_m->method_holder(), 4825 super_m->method_holder(), 4826 super_m->access_flags(), 4827 false, false, CHECK); 4828 if (can_access) { 4829 // this class can access super final method and therefore override 4830 ResourceMark rm(THREAD); 4831 Exceptions::fthrow(THREAD_AND_LOCATION, 4832 vmSymbols::java_lang_VerifyError(), 4833 "class %s overrides final method %s.%s%s", 4834 this_klass->external_name(), 4835 super_m->method_holder()->external_name(), 4836 name->as_C_string(), 4837 signature->as_C_string() 4838 ); 4839 return; 4840 } 4841 } 4842 4843 // continue to look from super_m's holder's super. 4844 k = super_m->method_holder()->super(); 4845 continue; 4846 } 4847 4848 k = k->super(); 4849 } 4850 } 4851 } 4852 } 4853 4854 4855 // assumes that this_klass is an interface 4856 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4857 assert(this_klass != NULL, "invariant"); 4858 assert(this_klass->is_interface(), "not an interface"); 4859 const Array<Method*>* methods = this_klass->methods(); 4860 const int num_methods = methods->length(); 4861 4862 for (int index = 0; index < num_methods; index++) { 4863 const Method* const m = methods->at(index); 4864 // if m is static and not the init method, throw a verify error 4865 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4866 ResourceMark rm(THREAD); 4867 Exceptions::fthrow( 4868 THREAD_AND_LOCATION, 4869 vmSymbols::java_lang_VerifyError(), 4870 "Illegal static method %s in interface %s", 4871 m->name()->as_C_string(), 4872 this_klass->external_name() 4873 ); 4874 return; 4875 } 4876 } 4877 } 4878 4879 // utility methods for format checking 4880 4881 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4882 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4883 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4884 if (is_module) { 4885 ResourceMark rm(THREAD); 4886 Exceptions::fthrow( 4887 THREAD_AND_LOCATION, 4888 vmSymbols::java_lang_NoClassDefFoundError(), 4889 "%s is not a class because access_flag ACC_MODULE is set", 4890 _class_name->as_C_string()); 4891 return; 4892 } 4893 4894 if (!_need_verify) { return; } 4895 4896 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4897 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4898 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4899 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4900 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4901 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4902 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4903 const bool major_gte_14 = _major_version >= JAVA_14_VERSION; 4904 4905 if ((is_abstract && is_final) || 4906 (is_interface && !is_abstract) || 4907 (is_interface && major_gte_1_5 && (is_super || is_enum)) || 4908 (!is_interface && major_gte_1_5 && is_annotation)) { 4909 ResourceMark rm(THREAD); 4910 Exceptions::fthrow( 4911 THREAD_AND_LOCATION, 4912 vmSymbols::java_lang_ClassFormatError(), 4913 "Illegal class modifiers in class %s: 0x%X", 4914 _class_name->as_C_string(), flags 4915 ); 4916 return; 4917 } 4918 } 4919 4920 static bool has_illegal_visibility(jint flags) { 4921 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4922 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4923 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4924 4925 return ((is_public && is_protected) || 4926 (is_public && is_private) || 4927 (is_protected && is_private)); 4928 } 4929 4930 // A legal major_version.minor_version must be one of the following: 4931 // 4932 // Major_version >= 45 and major_version < 56, any minor_version. 4933 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. 4934 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. 4935 // 4936 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4937 ResourceMark rm(THREAD); 4938 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4939 if (major < JAVA_MIN_SUPPORTED_VERSION) { 4940 Exceptions::fthrow( 4941 THREAD_AND_LOCATION, 4942 vmSymbols::java_lang_UnsupportedClassVersionError(), 4943 "%s (class file version %u.%u) was compiled with an invalid major version", 4944 class_name->as_C_string(), major, minor); 4945 return; 4946 } 4947 4948 if (major > max_version) { 4949 Exceptions::fthrow( 4950 THREAD_AND_LOCATION, 4951 vmSymbols::java_lang_UnsupportedClassVersionError(), 4952 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4953 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4954 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4955 return; 4956 } 4957 4958 if (major < JAVA_12_VERSION || minor == 0) { 4959 return; 4960 } 4961 4962 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4963 if (major != max_version) { 4964 Exceptions::fthrow( 4965 THREAD_AND_LOCATION, 4966 vmSymbols::java_lang_UnsupportedClassVersionError(), 4967 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4968 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4969 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4970 return; 4971 } 4972 4973 if (!Arguments::enable_preview()) { 4974 Exceptions::fthrow( 4975 THREAD_AND_LOCATION, 4976 vmSymbols::java_lang_UnsupportedClassVersionError(), 4977 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4978 class_name->as_C_string(), major, minor); 4979 return; 4980 } 4981 4982 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4983 Exceptions::fthrow( 4984 THREAD_AND_LOCATION, 4985 vmSymbols::java_lang_UnsupportedClassVersionError(), 4986 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4987 class_name->as_C_string(), major, minor); 4988 } 4989 } 4990 4991 void ClassFileParser::verify_legal_field_modifiers(jint flags, 4992 bool is_interface, 4993 TRAPS) const { 4994 if (!_need_verify) { return; } 4995 4996 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4997 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4998 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4999 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 5000 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5001 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 5002 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 5003 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 5004 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 5005 5006 bool is_illegal = false; 5007 5008 if (is_interface) { 5009 if (!is_public || !is_static || !is_final || is_private || 5010 is_protected || is_volatile || is_transient || 5011 (major_gte_1_5 && is_enum)) { 5012 is_illegal = true; 5013 } 5014 } else { // not interface 5015 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 5016 is_illegal = true; 5017 } 5018 } 5019 5020 if (is_illegal) { 5021 ResourceMark rm(THREAD); 5022 Exceptions::fthrow( 5023 THREAD_AND_LOCATION, 5024 vmSymbols::java_lang_ClassFormatError(), 5025 "Illegal field modifiers in class %s: 0x%X", 5026 _class_name->as_C_string(), flags); 5027 return; 5028 } 5029 } 5030 5031 void ClassFileParser::verify_legal_method_modifiers(jint flags, 5032 bool is_interface, 5033 const Symbol* name, 5034 TRAPS) const { 5035 if (!_need_verify) { return; } 5036 5037 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 5038 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 5039 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 5040 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5041 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 5042 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 5043 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 5044 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 5045 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 5046 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 5047 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 5048 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 5049 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 5050 5051 bool is_illegal = false; 5052 5053 if (is_interface) { 5054 if (major_gte_8) { 5055 // Class file version is JAVA_8_VERSION or later Methods of 5056 // interfaces may set any of the flags except ACC_PROTECTED, 5057 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 5058 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 5059 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 5060 (is_native || is_protected || is_final || is_synchronized) || 5061 // If a specific method of a class or interface has its 5062 // ACC_ABSTRACT flag set, it must not have any of its 5063 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 5064 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 5065 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 5066 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 5067 (is_abstract && (is_private || is_static || is_strict))) { 5068 is_illegal = true; 5069 } 5070 } else if (major_gte_1_5) { 5071 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 5072 if (!is_public || is_private || is_protected || is_static || is_final || 5073 is_synchronized || is_native || !is_abstract || is_strict) { 5074 is_illegal = true; 5075 } 5076 } else { 5077 // Class file version is pre-JAVA_1_5_VERSION 5078 if (!is_public || is_static || is_final || is_native || !is_abstract) { 5079 is_illegal = true; 5080 } 5081 } 5082 } else { // not interface 5083 if (has_illegal_visibility(flags)) { 5084 is_illegal = true; 5085 } else { 5086 if (is_initializer) { 5087 if (is_static || is_final || is_synchronized || is_native || 5088 is_abstract || (major_gte_1_5 && is_bridge)) { 5089 is_illegal = true; 5090 } 5091 } else { // not initializer 5092 if (is_abstract) { 5093 if ((is_final || is_native || is_private || is_static || 5094 (major_gte_1_5 && (is_synchronized || is_strict)))) { 5095 is_illegal = true; 5096 } 5097 } 5098 } 5099 } 5100 } 5101 5102 if (is_illegal) { 5103 ResourceMark rm(THREAD); 5104 Exceptions::fthrow( 5105 THREAD_AND_LOCATION, 5106 vmSymbols::java_lang_ClassFormatError(), 5107 "Method %s in class %s has illegal modifiers: 0x%X", 5108 name->as_C_string(), _class_name->as_C_string(), flags); 5109 return; 5110 } 5111 } 5112 5113 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 5114 int length, 5115 TRAPS) const { 5116 assert(_need_verify, "only called when _need_verify is true"); 5117 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 5118 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5119 } 5120 } 5121 5122 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5123 // In class names, '/' separates unqualified names. This is verified in this function also. 5124 // Method names also may not contain the characters '<' or '>', unless <init> 5125 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5126 // method. Because these names have been checked as special cases before 5127 // calling this method in verify_legal_method_name. 5128 // 5129 // This method is also called from the modular system APIs in modules.cpp 5130 // to verify the validity of module and package names. 5131 bool ClassFileParser::verify_unqualified_name(const char* name, 5132 unsigned int length, 5133 int type) { 5134 if (length == 0) return false; // Must have at least one char. 5135 for (const char* p = name; p != name + length; p++) { 5136 switch(*p) { 5137 case JVM_SIGNATURE_DOT: 5138 case JVM_SIGNATURE_ENDCLASS: 5139 case JVM_SIGNATURE_ARRAY: 5140 // do not permit '.', ';', or '[' 5141 return false; 5142 case JVM_SIGNATURE_SLASH: 5143 // check for '//' or leading or trailing '/' which are not legal 5144 // unqualified name must not be empty 5145 if (type == ClassFileParser::LegalClass) { 5146 if (p == name || p+1 >= name+length || 5147 *(p+1) == JVM_SIGNATURE_SLASH) { 5148 return false; 5149 } 5150 } else { 5151 return false; // do not permit '/' unless it's class name 5152 } 5153 break; 5154 case JVM_SIGNATURE_SPECIAL: 5155 case JVM_SIGNATURE_ENDSPECIAL: 5156 // do not permit '<' or '>' in method names 5157 if (type == ClassFileParser::LegalMethod) { 5158 return false; 5159 } 5160 } 5161 } 5162 return true; 5163 } 5164 5165 // Take pointer to a UTF8 byte string (not NUL-terminated). 5166 // Skip over the longest part of the string that could 5167 // be taken as a fieldname. Allow '/' if slash_ok is true. 5168 // Return a pointer to just past the fieldname. 5169 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5170 // being true, we saw consecutive slashes (meaning we were looking for a 5171 // qualified path but found something that was badly-formed). 5172 static const char* skip_over_field_name(const char* const name, 5173 bool slash_ok, 5174 unsigned int length) { 5175 const char* p; 5176 jboolean last_is_slash = false; 5177 jboolean not_first_ch = false; 5178 5179 for (p = name; p != name + length; not_first_ch = true) { 5180 const char* old_p = p; 5181 jchar ch = *p; 5182 if (ch < 128) { 5183 p++; 5184 // quick check for ascii 5185 if ((ch >= 'a' && ch <= 'z') || 5186 (ch >= 'A' && ch <= 'Z') || 5187 (ch == '_' || ch == '$') || 5188 (not_first_ch && ch >= '0' && ch <= '9')) { 5189 last_is_slash = false; 5190 continue; 5191 } 5192 if (slash_ok && ch == JVM_SIGNATURE_SLASH) { 5193 if (last_is_slash) { 5194 return NULL; // Don't permit consecutive slashes 5195 } 5196 last_is_slash = true; 5197 continue; 5198 } 5199 } 5200 else { 5201 jint unicode_ch; 5202 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5203 p = tmp_p; 5204 last_is_slash = false; 5205 // Check if ch is Java identifier start or is Java identifier part 5206 // 4672820: call java.lang.Character methods directly without generating separate tables. 5207 EXCEPTION_MARK; 5208 // return value 5209 JavaValue result(T_BOOLEAN); 5210 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 5211 JavaCallArguments args; 5212 args.push_int(unicode_ch); 5213 5214 if (not_first_ch) { 5215 // public static boolean isJavaIdentifierPart(char ch); 5216 JavaCalls::call_static(&result, 5217 SystemDictionary::Character_klass(), 5218 vmSymbols::isJavaIdentifierPart_name(), 5219 vmSymbols::int_bool_signature(), 5220 &args, 5221 THREAD); 5222 } else { 5223 // public static boolean isJavaIdentifierStart(char ch); 5224 JavaCalls::call_static(&result, 5225 SystemDictionary::Character_klass(), 5226 vmSymbols::isJavaIdentifierStart_name(), 5227 vmSymbols::int_bool_signature(), 5228 &args, 5229 THREAD); 5230 } 5231 if (HAS_PENDING_EXCEPTION) { 5232 CLEAR_PENDING_EXCEPTION; 5233 return NULL; 5234 } 5235 if(result.get_jboolean()) { 5236 continue; 5237 } 5238 } 5239 return (not_first_ch) ? old_p : NULL; 5240 } 5241 return (not_first_ch) ? p : NULL; 5242 } 5243 5244 // Take pointer to a UTF8 byte string (not NUL-terminated). 5245 // Skip over the longest part of the string that could 5246 // be taken as a field signature. Allow "void" if void_ok. 5247 // Return a pointer to just past the signature. 5248 // Return NULL if no legal signature is found. 5249 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5250 bool void_ok, 5251 unsigned int length, 5252 TRAPS) const { 5253 unsigned int array_dim = 0; 5254 while (length > 0) { 5255 switch (signature[0]) { 5256 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5257 case JVM_SIGNATURE_BOOLEAN: 5258 case JVM_SIGNATURE_BYTE: 5259 case JVM_SIGNATURE_CHAR: 5260 case JVM_SIGNATURE_SHORT: 5261 case JVM_SIGNATURE_INT: 5262 case JVM_SIGNATURE_FLOAT: 5263 case JVM_SIGNATURE_LONG: 5264 case JVM_SIGNATURE_DOUBLE: 5265 return signature + 1; 5266 case JVM_SIGNATURE_CLASS: { 5267 if (_major_version < JAVA_1_5_VERSION) { 5268 // Skip over the class name if one is there 5269 const char* const p = skip_over_field_name(signature + 1, true, --length); 5270 5271 // The next character better be a semicolon 5272 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) { 5273 return p + 1; 5274 } 5275 } 5276 else { 5277 // Skip leading 'L' and ignore first appearance of ';' 5278 signature++; 5279 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); 5280 // Format check signature 5281 if (c != NULL) { 5282 int newlen = c - (char*) signature; 5283 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 5284 if (!legal) { 5285 classfile_parse_error("Class name is empty or contains illegal character " 5286 "in descriptor in class file %s", 5287 CHECK_0); 5288 return NULL; 5289 } 5290 return signature + newlen + 1; 5291 } 5292 } 5293 return NULL; 5294 } 5295 case JVM_SIGNATURE_ARRAY: 5296 array_dim++; 5297 if (array_dim > 255) { 5298 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5299 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5300 } 5301 // The rest of what's there better be a legal signature 5302 signature++; 5303 length--; 5304 void_ok = false; 5305 break; 5306 default: 5307 return NULL; 5308 } 5309 } 5310 return NULL; 5311 } 5312 5313 // Checks if name is a legal class name. 5314 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5315 if (!_need_verify || _relax_verify) { return; } 5316 5317 assert(name->refcount() > 0, "symbol must be kept alive"); 5318 char* bytes = (char*)name->bytes(); 5319 unsigned int length = name->utf8_length(); 5320 bool legal = false; 5321 5322 if (length > 0) { 5323 const char* p; 5324 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5325 p = skip_over_field_signature(bytes, false, length, CHECK); 5326 legal = (p != NULL) && ((p - bytes) == (int)length); 5327 } else if (_major_version < JAVA_1_5_VERSION) { 5328 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5329 p = skip_over_field_name(bytes, true, length); 5330 legal = (p != NULL) && ((p - bytes) == (int)length); 5331 } 5332 } else { 5333 // 4900761: relax the constraints based on JSR202 spec 5334 // Class names may be drawn from the entire Unicode character set. 5335 // Identifiers between '/' must be unqualified names. 5336 // The utf8 string has been verified when parsing cpool entries. 5337 legal = verify_unqualified_name(bytes, length, LegalClass); 5338 } 5339 } 5340 if (!legal) { 5341 ResourceMark rm(THREAD); 5342 assert(_class_name != NULL, "invariant"); 5343 Exceptions::fthrow( 5344 THREAD_AND_LOCATION, 5345 vmSymbols::java_lang_ClassFormatError(), 5346 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5347 _class_name->as_C_string() 5348 ); 5349 return; 5350 } 5351 } 5352 5353 // Checks if name is a legal field name. 5354 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5355 if (!_need_verify || _relax_verify) { return; } 5356 5357 char* bytes = (char*)name->bytes(); 5358 unsigned int length = name->utf8_length(); 5359 bool legal = false; 5360 5361 if (length > 0) { 5362 if (_major_version < JAVA_1_5_VERSION) { 5363 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5364 const char* p = skip_over_field_name(bytes, false, length); 5365 legal = (p != NULL) && ((p - bytes) == (int)length); 5366 } 5367 } else { 5368 // 4881221: relax the constraints based on JSR202 spec 5369 legal = verify_unqualified_name(bytes, length, LegalField); 5370 } 5371 } 5372 5373 if (!legal) { 5374 ResourceMark rm(THREAD); 5375 assert(_class_name != NULL, "invariant"); 5376 Exceptions::fthrow( 5377 THREAD_AND_LOCATION, 5378 vmSymbols::java_lang_ClassFormatError(), 5379 "Illegal field name \"%.*s\" in class %s", length, bytes, 5380 _class_name->as_C_string() 5381 ); 5382 return; 5383 } 5384 } 5385 5386 // Checks if name is a legal method name. 5387 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5388 if (!_need_verify || _relax_verify) { return; } 5389 5390 assert(name != NULL, "method name is null"); 5391 char* bytes = (char*)name->bytes(); 5392 unsigned int length = name->utf8_length(); 5393 bool legal = false; 5394 5395 if (length > 0) { 5396 if (bytes[0] == JVM_SIGNATURE_SPECIAL) { 5397 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5398 legal = true; 5399 } 5400 } else if (_major_version < JAVA_1_5_VERSION) { 5401 const char* p; 5402 p = skip_over_field_name(bytes, false, length); 5403 legal = (p != NULL) && ((p - bytes) == (int)length); 5404 } else { 5405 // 4881221: relax the constraints based on JSR202 spec 5406 legal = verify_unqualified_name(bytes, length, LegalMethod); 5407 } 5408 } 5409 5410 if (!legal) { 5411 ResourceMark rm(THREAD); 5412 assert(_class_name != NULL, "invariant"); 5413 Exceptions::fthrow( 5414 THREAD_AND_LOCATION, 5415 vmSymbols::java_lang_ClassFormatError(), 5416 "Illegal method name \"%.*s\" in class %s", length, bytes, 5417 _class_name->as_C_string() 5418 ); 5419 return; 5420 } 5421 } 5422 5423 5424 // Checks if signature is a legal field signature. 5425 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5426 const Symbol* signature, 5427 TRAPS) const { 5428 if (!_need_verify) { return; } 5429 5430 const char* const bytes = (const char* const)signature->bytes(); 5431 const unsigned int length = signature->utf8_length(); 5432 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5433 5434 if (p == NULL || (p - bytes) != (int)length) { 5435 throwIllegalSignature("Field", name, signature, CHECK); 5436 } 5437 } 5438 5439 // Checks if signature is a legal method signature. 5440 // Returns number of parameters 5441 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5442 const Symbol* signature, 5443 TRAPS) const { 5444 if (!_need_verify) { 5445 // make sure caller's args_size will be less than 0 even for non-static 5446 // method so it will be recomputed in compute_size_of_parameters(). 5447 return -2; 5448 } 5449 5450 // Class initializers cannot have args for class format version >= 51. 5451 if (name == vmSymbols::class_initializer_name() && 5452 signature != vmSymbols::void_method_signature() && 5453 _major_version >= JAVA_7_VERSION) { 5454 throwIllegalSignature("Method", name, signature, CHECK_0); 5455 return 0; 5456 } 5457 5458 unsigned int args_size = 0; 5459 const char* p = (const char*)signature->bytes(); 5460 unsigned int length = signature->utf8_length(); 5461 const char* nextp; 5462 5463 // The first character must be a '(' 5464 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5465 length--; 5466 // Skip over legal field signatures 5467 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5468 while ((length > 0) && (nextp != NULL)) { 5469 args_size++; 5470 if (p[0] == 'J' || p[0] == 'D') { 5471 args_size++; 5472 } 5473 length -= nextp - p; 5474 p = nextp; 5475 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5476 } 5477 // The first non-signature thing better be a ')' 5478 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5479 length--; 5480 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) { 5481 // All internal methods must return void 5482 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5483 return args_size; 5484 } 5485 } else { 5486 // Now we better just have a return value 5487 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5488 if (nextp && ((int)length == (nextp - p))) { 5489 return args_size; 5490 } 5491 } 5492 } 5493 } 5494 // Report error 5495 throwIllegalSignature("Method", name, signature, CHECK_0); 5496 return 0; 5497 } 5498 5499 int ClassFileParser::static_field_size() const { 5500 assert(_field_info != NULL, "invariant"); 5501 return _field_info->static_field_size; 5502 } 5503 5504 int ClassFileParser::total_oop_map_count() const { 5505 assert(_field_info != NULL, "invariant"); 5506 return _field_info->total_oop_map_count; 5507 } 5508 5509 jint ClassFileParser::layout_size() const { 5510 assert(_field_info != NULL, "invariant"); 5511 return _field_info->instance_size; 5512 } 5513 5514 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5515 const Array<Method*>* methods) { 5516 assert(ik != NULL, "invariant"); 5517 assert(methods != NULL, "invariant"); 5518 5519 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5520 // (We used to do this lazily, but now we query it in Rewriter, 5521 // which is eagerly done for every method, so we might as well do it now, 5522 // when everything is fresh in memory.) 5523 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5524 5525 if (klass_id != vmSymbols::NO_SID) { 5526 for (int j = 0; j < methods->length(); ++j) { 5527 Method* method = methods->at(j); 5528 method->init_intrinsic_id(); 5529 5530 if (CheckIntrinsics) { 5531 // Check if an intrinsic is defined for method 'method', 5532 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5533 if (method->intrinsic_id() != vmIntrinsics::_none && 5534 !method->intrinsic_candidate()) { 5535 tty->print("Compiler intrinsic is defined for method [%s], " 5536 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5537 method->name_and_sig_as_C_string(), 5538 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5539 ); 5540 tty->cr(); 5541 DEBUG_ONLY(vm_exit(1)); 5542 } 5543 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5544 // but there is no intrinsic available for it. 5545 if (method->intrinsic_candidate() && 5546 method->intrinsic_id() == vmIntrinsics::_none) { 5547 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5548 "but no compiler intrinsic is defined for the method.%s", 5549 method->name_and_sig_as_C_string(), 5550 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5551 ); 5552 tty->cr(); 5553 DEBUG_ONLY(vm_exit(1)); 5554 } 5555 } 5556 } // end for 5557 5558 #ifdef ASSERT 5559 if (CheckIntrinsics) { 5560 // Check for orphan methods in the current class. A method m 5561 // of a class C is orphan if an intrinsic is defined for method m, 5562 // but class C does not declare m. 5563 // The check is potentially expensive, therefore it is available 5564 // only in debug builds. 5565 5566 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5567 if (vmIntrinsics::_compiledLambdaForm == id) { 5568 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5569 // generated for the JVM from a LambdaForm and therefore no method 5570 // is defined for it. 5571 continue; 5572 } 5573 5574 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5575 // Check if the current class contains a method with the same 5576 // name, flags, signature. 5577 bool match = false; 5578 for (int j = 0; j < methods->length(); ++j) { 5579 const Method* method = methods->at(j); 5580 if (method->intrinsic_id() == id) { 5581 match = true; 5582 break; 5583 } 5584 } 5585 5586 if (!match) { 5587 char buf[1000]; 5588 tty->print("Compiler intrinsic is defined for method [%s], " 5589 "but the method is not available in class [%s].%s", 5590 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5591 buf, sizeof(buf)), 5592 ik->name()->as_C_string(), 5593 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5594 ); 5595 tty->cr(); 5596 DEBUG_ONLY(vm_exit(1)); 5597 } 5598 } 5599 } // end for 5600 } // CheckIntrinsics 5601 #endif // ASSERT 5602 } 5603 } 5604 5605 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5606 if (_klass != NULL) { 5607 return _klass; 5608 } 5609 5610 InstanceKlass* const ik = 5611 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5612 5613 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5614 5615 assert(_klass == ik, "invariant"); 5616 5617 5618 if (ik->should_store_fingerprint()) { 5619 ik->store_fingerprint(_stream->compute_fingerprint()); 5620 } 5621 5622 ik->set_has_passed_fingerprint_check(false); 5623 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5624 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5625 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint(); 5626 if (aot_fp != 0 && aot_fp == fp) { 5627 // This class matches with a class saved in an AOT library 5628 ik->set_has_passed_fingerprint_check(true); 5629 } else { 5630 ResourceMark rm; 5631 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5632 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5633 } 5634 } 5635 5636 return ik; 5637 } 5638 5639 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5640 assert(ik != NULL, "invariant"); 5641 5642 // Set name and CLD before adding to CLD 5643 ik->set_class_loader_data(_loader_data); 5644 ik->set_name(_class_name); 5645 5646 // Add all classes to our internal class loader list here, 5647 // including classes in the bootstrap (NULL) class loader. 5648 const bool publicize = !is_internal(); 5649 5650 _loader_data->add_class(ik, publicize); 5651 5652 set_klass_to_deallocate(ik); 5653 5654 assert(_field_info != NULL, "invariant"); 5655 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5656 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count, 5657 "sanity"); 5658 5659 assert(ik->is_instance_klass(), "sanity"); 5660 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5661 5662 // Fill in information already parsed 5663 ik->set_should_verify_class(_need_verify); 5664 5665 // Not yet: supers are done below to support the new subtype-checking fields 5666 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5667 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5668 assert(_fac != NULL, "invariant"); 5669 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]); 5670 5671 // this transfers ownership of a lot of arrays from 5672 // the parser onto the InstanceKlass* 5673 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5674 5675 // note that is not safe to use the fields in the parser from this point on 5676 assert(NULL == _cp, "invariant"); 5677 assert(NULL == _fields, "invariant"); 5678 assert(NULL == _methods, "invariant"); 5679 assert(NULL == _inner_classes, "invariant"); 5680 assert(NULL == _nest_members, "invariant"); 5681 assert(NULL == _local_interfaces, "invariant"); 5682 assert(NULL == _combined_annotations, "invariant"); 5683 assert(NULL == _record_components, "invariant"); 5684 5685 if (_has_final_method) { 5686 ik->set_has_final_method(); 5687 } 5688 5689 ik->copy_method_ordering(_method_ordering, CHECK); 5690 // The InstanceKlass::_methods_jmethod_ids cache 5691 // is managed on the assumption that the initial cache 5692 // size is equal to the number of methods in the class. If 5693 // that changes, then InstanceKlass::idnum_can_increment() 5694 // has to be changed accordingly. 5695 ik->set_initial_method_idnum(ik->methods()->length()); 5696 5697 ik->set_this_class_index(_this_class_index); 5698 5699 if (is_unsafe_anonymous()) { 5700 // _this_class_index is a CONSTANT_Class entry that refers to this 5701 // anonymous class itself. If this class needs to refer to its own methods or 5702 // fields, it would use a CONSTANT_MethodRef, etc, which would reference 5703 // _this_class_index. However, because this class is anonymous (it's 5704 // not stored in SystemDictionary), _this_class_index cannot be resolved 5705 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5706 // Therefore, we must eagerly resolve _this_class_index now. 5707 ik->constants()->klass_at_put(_this_class_index, ik); 5708 } 5709 5710 ik->set_minor_version(_minor_version); 5711 ik->set_major_version(_major_version); 5712 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5713 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5714 5715 if (_unsafe_anonymous_host != NULL) { 5716 assert (ik->is_unsafe_anonymous(), "should be the same"); 5717 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host); 5718 } 5719 5720 // Set PackageEntry for this_klass 5721 oop cl = ik->class_loader(); 5722 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5723 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5724 ik->set_package(cld, CHECK); 5725 5726 const Array<Method*>* const methods = ik->methods(); 5727 assert(methods != NULL, "invariant"); 5728 const int methods_len = methods->length(); 5729 5730 check_methods_for_intrinsics(ik, methods); 5731 5732 // Fill in field values obtained by parse_classfile_attributes 5733 if (_parsed_annotations->has_any_annotations()) { 5734 _parsed_annotations->apply_to(ik); 5735 } 5736 5737 apply_parsed_class_attributes(ik); 5738 5739 // Miranda methods 5740 if ((_num_miranda_methods > 0) || 5741 // if this class introduced new miranda methods or 5742 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5743 // super class exists and this class inherited miranda methods 5744 ) { 5745 ik->set_has_miranda_methods(); // then set a flag 5746 } 5747 5748 // Fill in information needed to compute superclasses. 5749 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5750 ik->set_transitive_interfaces(_transitive_interfaces); 5751 _transitive_interfaces = NULL; 5752 5753 // Initialize itable offset tables 5754 klassItable::setup_itable_offset_table(ik); 5755 5756 // Compute transitive closure of interfaces this class implements 5757 // Do final class setup 5758 fill_oop_maps(ik, 5759 _field_info->nonstatic_oop_map_count, 5760 _field_info->nonstatic_oop_offsets, 5761 _field_info->nonstatic_oop_counts); 5762 5763 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5764 set_precomputed_flags(ik); 5765 5766 // check if this class can access its super class 5767 check_super_class_access(ik, CHECK); 5768 5769 // check if this class can access its superinterfaces 5770 check_super_interface_access(ik, CHECK); 5771 5772 // check if this class overrides any final method 5773 check_final_method_override(ik, CHECK); 5774 5775 // reject static interface methods prior to Java 8 5776 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5777 check_illegal_static_method(ik, CHECK); 5778 } 5779 5780 // Obtain this_klass' module entry 5781 ModuleEntry* module_entry = ik->module(); 5782 assert(module_entry != NULL, "module_entry should always be set"); 5783 5784 // Obtain java.lang.Module 5785 Handle module_handle(THREAD, module_entry->module()); 5786 5787 // Allocate mirror and initialize static fields 5788 // The create_mirror() call will also call compute_modifiers() 5789 java_lang_Class::create_mirror(ik, 5790 Handle(THREAD, _loader_data->class_loader()), 5791 module_handle, 5792 _protection_domain, 5793 CHECK); 5794 5795 assert(_all_mirandas != NULL, "invariant"); 5796 5797 // Generate any default methods - default methods are public interface methods 5798 // that have a default implementation. This is new with Java 8. 5799 if (_has_nonstatic_concrete_methods) { 5800 DefaultMethods::generate_default_methods(ik, 5801 _all_mirandas, 5802 CHECK); 5803 } 5804 5805 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5806 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5807 !module_entry->has_default_read_edges()) { 5808 if (!module_entry->set_has_default_read_edges()) { 5809 // We won a potential race 5810 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5811 } 5812 } 5813 5814 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5815 5816 if (!is_internal()) { 5817 if (log_is_enabled(Info, class, load)) { 5818 ResourceMark rm; 5819 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5820 ik->print_class_load_logging(_loader_data, module_name, _stream); 5821 } 5822 5823 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5824 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && 5825 log_is_enabled(Info, class, preview)) { 5826 ResourceMark rm; 5827 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5828 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); 5829 } 5830 5831 if (log_is_enabled(Debug, class, resolve)) { 5832 ResourceMark rm; 5833 // print out the superclass. 5834 const char * from = ik->external_name(); 5835 if (ik->java_super() != NULL) { 5836 log_debug(class, resolve)("%s %s (super)", 5837 from, 5838 ik->java_super()->external_name()); 5839 } 5840 // print out each of the interface classes referred to by this class. 5841 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5842 if (local_interfaces != NULL) { 5843 const int length = local_interfaces->length(); 5844 for (int i = 0; i < length; i++) { 5845 const InstanceKlass* const k = local_interfaces->at(i); 5846 const char * to = k->external_name(); 5847 log_debug(class, resolve)("%s %s (interface)", from, to); 5848 } 5849 } 5850 } 5851 } 5852 5853 JFR_ONLY(INIT_ID(ik);) 5854 5855 // If we reach here, all is well. 5856 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5857 // in order for it to not be destroyed in the ClassFileParser destructor. 5858 set_klass_to_deallocate(NULL); 5859 5860 // it's official 5861 set_klass(ik); 5862 5863 debug_only(ik->verify();) 5864 } 5865 5866 void ClassFileParser::update_class_name(Symbol* new_class_name) { 5867 // Decrement the refcount in the old name, since we're clobbering it. 5868 _class_name->decrement_refcount(); 5869 5870 _class_name = new_class_name; 5871 // Increment the refcount of the new name. 5872 // Now the ClassFileParser owns this name and will decrement in 5873 // the destructor. 5874 _class_name->increment_refcount(); 5875 } 5876 5877 5878 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's 5879 // package by prepending its host class's package name to its class name and setting 5880 // its _class_name field. 5881 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) { 5882 ResourceMark rm(THREAD); 5883 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL, 5884 "Unsafe anonymous class should not be in a package"); 5885 const char* host_pkg_name = 5886 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL); 5887 5888 if (host_pkg_name != NULL) { 5889 int host_pkg_len = (int)strlen(host_pkg_name); 5890 int class_name_len = _class_name->utf8_length(); 5891 int symbol_len = host_pkg_len + 1 + class_name_len; 5892 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1); 5893 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s", 5894 host_pkg_name, class_name_len, _class_name->base()); 5895 assert(n == symbol_len, "Unexpected number of characters in string"); 5896 5897 // Decrement old _class_name to avoid leaking. 5898 _class_name->decrement_refcount(); 5899 5900 // Create a symbol and update the anonymous class name. 5901 // The new class name is created with a refcount of one. When installed into the InstanceKlass, 5902 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted 5903 // when the class is unloaded. 5904 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len); 5905 } 5906 } 5907 5908 // If the host class and the anonymous class are in the same package then do 5909 // nothing. If the anonymous class is in the unnamed package then move it to its 5910 // host's package. If the classes are in different packages then throw an IAE 5911 // exception. 5912 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) { 5913 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class"); 5914 5915 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(), 5916 _class_name->utf8_length(), JVM_SIGNATURE_SLASH); 5917 if (anon_last_slash == NULL) { // Unnamed package 5918 prepend_host_package_name(_unsafe_anonymous_host, CHECK); 5919 } else { 5920 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) { 5921 ResourceMark rm(THREAD); 5922 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5923 err_msg("Host class %s and anonymous class %s are in different packages", 5924 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string())); 5925 } 5926 } 5927 } 5928 5929 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5930 bool trusted = (loader_data->is_the_null_class_loader_data() || 5931 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 5932 bool need_verify = 5933 // verifyAll 5934 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5935 // verifyRemote 5936 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5937 return !need_verify; 5938 } 5939 5940 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5941 Symbol* name, 5942 ClassLoaderData* loader_data, 5943 Handle protection_domain, 5944 const InstanceKlass* unsafe_anonymous_host, 5945 GrowableArray<Handle>* cp_patches, 5946 Publicity pub_level, 5947 TRAPS) : 5948 _stream(stream), 5949 _requested_name(name), 5950 _class_name(NULL), 5951 _loader_data(loader_data), 5952 _unsafe_anonymous_host(unsafe_anonymous_host), 5953 _cp_patches(cp_patches), 5954 _num_patched_klasses(0), 5955 _max_num_patched_klasses(0), 5956 _orig_cp_size(0), 5957 _first_patched_klass_resolved_index(0), 5958 _super_klass(), 5959 _cp(NULL), 5960 _fields(NULL), 5961 _methods(NULL), 5962 _inner_classes(NULL), 5963 _nest_members(NULL), 5964 _nest_host(0), 5965 _record_components(NULL), 5966 _local_interfaces(NULL), 5967 _transitive_interfaces(NULL), 5968 _combined_annotations(NULL), 5969 _class_annotations(NULL), 5970 _class_type_annotations(NULL), 5971 _fields_annotations(NULL), 5972 _fields_type_annotations(NULL), 5973 _klass(NULL), 5974 _klass_to_deallocate(NULL), 5975 _parsed_annotations(NULL), 5976 _fac(NULL), 5977 _field_info(NULL), 5978 _method_ordering(NULL), 5979 _all_mirandas(NULL), 5980 _vtable_size(0), 5981 _itable_size(0), 5982 _num_miranda_methods(0), 5983 _rt(REF_NONE), 5984 _protection_domain(protection_domain), 5985 _access_flags(), 5986 _pub_level(pub_level), 5987 _bad_constant_seen(0), 5988 _synthetic_flag(false), 5989 _sde_length(false), 5990 _sde_buffer(NULL), 5991 _sourcefile_index(0), 5992 _generic_signature_index(0), 5993 _major_version(0), 5994 _minor_version(0), 5995 _this_class_index(0), 5996 _super_class_index(0), 5997 _itfs_len(0), 5998 _java_fields_count(0), 5999 _need_verify(false), 6000 _relax_verify(false), 6001 _has_nonstatic_concrete_methods(false), 6002 _declares_nonstatic_concrete_methods(false), 6003 _has_final_method(false), 6004 _has_finalizer(false), 6005 _has_empty_finalizer(false), 6006 _has_vanilla_constructor(false), 6007 _max_bootstrap_specifier_index(-1) { 6008 6009 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 6010 _class_name->increment_refcount(); 6011 6012 assert(THREAD->is_Java_thread(), "invariant"); 6013 assert(_loader_data != NULL, "invariant"); 6014 assert(stream != NULL, "invariant"); 6015 assert(_stream != NULL, "invariant"); 6016 assert(_stream->buffer() == _stream->current(), "invariant"); 6017 assert(_class_name != NULL, "invariant"); 6018 assert(0 == _access_flags.as_int(), "invariant"); 6019 6020 // Figure out whether we can skip format checking (matching classic VM behavior) 6021 if (DumpSharedSpaces) { 6022 // verify == true means it's a 'remote' class (i.e., non-boot class) 6023 // Verification decision is based on BytecodeVerificationRemote flag 6024 // for those classes. 6025 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 6026 BytecodeVerificationLocal; 6027 } 6028 else { 6029 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 6030 stream->need_verify()); 6031 } 6032 if (_cp_patches != NULL) { 6033 int len = _cp_patches->length(); 6034 for (int i=0; i<len; i++) { 6035 if (has_cp_patch_at(i)) { 6036 Handle patch = cp_patch_at(i); 6037 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 6038 // We need to append the names of the patched classes to the end of the constant pool, 6039 // because a patched class may have a Utf8 name that's not already included in the 6040 // original constant pool. These class names are used when patch_constant_pool() 6041 // calls patch_class(). 6042 // 6043 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 6044 // At this point, we don't know the tag for index i yet, because we haven't parsed the 6045 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 6046 _max_num_patched_klasses++; 6047 } 6048 } 6049 } 6050 } 6051 6052 // synch back verification state to stream 6053 stream->set_verify(_need_verify); 6054 6055 // Check if verification needs to be relaxed for this class file 6056 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 6057 _relax_verify = relax_format_check_for(_loader_data); 6058 6059 parse_stream(stream, CHECK); 6060 6061 post_process_parsed_stream(stream, _cp, CHECK); 6062 } 6063 6064 void ClassFileParser::clear_class_metadata() { 6065 // metadata created before the instance klass is created. Must be 6066 // deallocated if classfile parsing returns an error. 6067 _cp = NULL; 6068 _fields = NULL; 6069 _methods = NULL; 6070 _inner_classes = NULL; 6071 _nest_members = NULL; 6072 _local_interfaces = NULL; 6073 _combined_annotations = NULL; 6074 _class_annotations = _class_type_annotations = NULL; 6075 _fields_annotations = _fields_type_annotations = NULL; 6076 _record_components = NULL; 6077 } 6078 6079 // Destructor to clean up 6080 ClassFileParser::~ClassFileParser() { 6081 _class_name->decrement_refcount(); 6082 6083 if (_cp != NULL) { 6084 MetadataFactory::free_metadata(_loader_data, _cp); 6085 } 6086 if (_fields != NULL) { 6087 MetadataFactory::free_array<u2>(_loader_data, _fields); 6088 } 6089 6090 if (_methods != NULL) { 6091 // Free methods 6092 InstanceKlass::deallocate_methods(_loader_data, _methods); 6093 } 6094 6095 // beware of the Universe::empty_blah_array!! 6096 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 6097 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 6098 } 6099 6100 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) { 6101 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 6102 } 6103 6104 if (_record_components != NULL) { 6105 InstanceKlass::deallocate_record_components(_loader_data, _record_components); 6106 } 6107 6108 // Free interfaces 6109 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 6110 _local_interfaces, _transitive_interfaces); 6111 6112 if (_combined_annotations != NULL) { 6113 // After all annotations arrays have been created, they are installed into the 6114 // Annotations object that will be assigned to the InstanceKlass being created. 6115 6116 // Deallocate the Annotations object and the installed annotations arrays. 6117 _combined_annotations->deallocate_contents(_loader_data); 6118 6119 // If the _combined_annotations pointer is non-NULL, 6120 // then the other annotations fields should have been cleared. 6121 assert(_class_annotations == NULL, "Should have been cleared"); 6122 assert(_class_type_annotations == NULL, "Should have been cleared"); 6123 assert(_fields_annotations == NULL, "Should have been cleared"); 6124 assert(_fields_type_annotations == NULL, "Should have been cleared"); 6125 } else { 6126 // If the annotations arrays were not installed into the Annotations object, 6127 // then they have to be deallocated explicitly. 6128 MetadataFactory::free_array<u1>(_loader_data, _class_annotations); 6129 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations); 6130 Annotations::free_contents(_loader_data, _fields_annotations); 6131 Annotations::free_contents(_loader_data, _fields_type_annotations); 6132 } 6133 6134 clear_class_metadata(); 6135 _transitive_interfaces = NULL; 6136 6137 // deallocate the klass if already created. Don't directly deallocate, but add 6138 // to the deallocate list so that the klass is removed from the CLD::_klasses list 6139 // at a safepoint. 6140 if (_klass_to_deallocate != NULL) { 6141 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 6142 } 6143 } 6144 6145 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 6146 TRAPS) { 6147 6148 assert(stream != NULL, "invariant"); 6149 assert(_class_name != NULL, "invariant"); 6150 6151 // BEGIN STREAM PARSING 6152 stream->guarantee_more(8, CHECK); // magic, major, minor 6153 // Magic value 6154 const u4 magic = stream->get_u4_fast(); 6155 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 6156 "Incompatible magic value %u in class file %s", 6157 magic, CHECK); 6158 6159 // Version numbers 6160 _minor_version = stream->get_u2_fast(); 6161 _major_version = stream->get_u2_fast(); 6162 6163 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) { 6164 ResourceMark rm; 6165 warning("Pre JDK 6 class not supported by CDS: %u.%u %s", 6166 _major_version, _minor_version, _class_name->as_C_string()); 6167 Exceptions::fthrow( 6168 THREAD_AND_LOCATION, 6169 vmSymbols::java_lang_UnsupportedClassVersionError(), 6170 "Unsupported major.minor version for dump time %u.%u", 6171 _major_version, 6172 _minor_version); 6173 } 6174 6175 // Check version numbers - we check this even with verifier off 6176 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 6177 6178 stream->guarantee_more(3, CHECK); // length, first cp tag 6179 u2 cp_size = stream->get_u2_fast(); 6180 6181 guarantee_property( 6182 cp_size >= 1, "Illegal constant pool size %u in class file %s", 6183 cp_size, CHECK); 6184 6185 _orig_cp_size = cp_size; 6186 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 6187 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 6188 } 6189 cp_size += _max_num_patched_klasses; 6190 6191 _cp = ConstantPool::allocate(_loader_data, 6192 cp_size, 6193 CHECK); 6194 6195 ConstantPool* const cp = _cp; 6196 6197 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6198 6199 assert(cp_size == (const u2)cp->length(), "invariant"); 6200 6201 // ACCESS FLAGS 6202 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6203 6204 // Access flags 6205 jint flags; 6206 // JVM_ACC_MODULE is defined in JDK-9 and later. 6207 if (_major_version >= JAVA_9_VERSION) { 6208 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 6209 } else { 6210 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 6211 } 6212 6213 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6214 // Set abstract bit for old class files for backward compatibility 6215 flags |= JVM_ACC_ABSTRACT; 6216 } 6217 6218 verify_legal_class_modifiers(flags, CHECK); 6219 6220 short bad_constant = class_bad_constant_seen(); 6221 if (bad_constant != 0) { 6222 // Do not throw CFE until after the access_flags are checked because if 6223 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6224 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 6225 } 6226 6227 _access_flags.set_flags(flags); 6228 6229 // This class and superclass 6230 _this_class_index = stream->get_u2_fast(); 6231 check_property( 6232 valid_cp_range(_this_class_index, cp_size) && 6233 cp->tag_at(_this_class_index).is_unresolved_klass(), 6234 "Invalid this class index %u in constant pool in class file %s", 6235 _this_class_index, CHECK); 6236 6237 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6238 assert(class_name_in_cp != NULL, "class_name can't be null"); 6239 6240 // Update _class_name to reflect the name in the constant pool 6241 update_class_name(class_name_in_cp); 6242 6243 // Don't need to check whether this class name is legal or not. 6244 // It has been checked when constant pool is parsed. 6245 // However, make sure it is not an array type. 6246 if (_need_verify) { 6247 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY, 6248 "Bad class name in class file %s", 6249 CHECK); 6250 } 6251 6252 // Checks if name in class file matches requested name 6253 if (_requested_name != NULL && _requested_name != _class_name) { 6254 ResourceMark rm(THREAD); 6255 Exceptions::fthrow( 6256 THREAD_AND_LOCATION, 6257 vmSymbols::java_lang_NoClassDefFoundError(), 6258 "%s (wrong name: %s)", 6259 _class_name->as_C_string(), 6260 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 6261 ); 6262 return; 6263 } 6264 6265 // if this is an anonymous class fix up its name if it's in the unnamed 6266 // package. Otherwise, throw IAE if it is in a different package than 6267 // its host class. 6268 if (_unsafe_anonymous_host != NULL) { 6269 fix_unsafe_anonymous_class_name(CHECK); 6270 } 6271 6272 // Verification prevents us from creating names with dots in them, this 6273 // asserts that that's the case. 6274 assert(is_internal_format(_class_name), "external class name format used internally"); 6275 6276 if (!is_internal()) { 6277 LogTarget(Debug, class, preorder) lt; 6278 if (lt.is_enabled()){ 6279 ResourceMark rm(THREAD); 6280 LogStream ls(lt); 6281 ls.print("%s", _class_name->as_klass_external_name()); 6282 if (stream->source() != NULL) { 6283 ls.print(" source: %s", stream->source()); 6284 } 6285 ls.cr(); 6286 } 6287 6288 #if INCLUDE_CDS 6289 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6290 if (!ClassLoader::has_jrt_entry()) { 6291 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6292 DumpLoadedClassList = NULL; 6293 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6294 _unsafe_anonymous_host == NULL) { 6295 // Only dump the classes that can be stored into CDS archive. 6296 // Unsafe anonymous classes such as generated LambdaForm classes are also not included. 6297 oop class_loader = _loader_data->class_loader(); 6298 ResourceMark rm(THREAD); 6299 bool skip = false; 6300 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6301 // For the boot and platform class loaders, skip classes that are not found in the 6302 // java runtime image, such as those found in the --patch-module entries. 6303 // These classes can't be loaded from the archive during runtime. 6304 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) { 6305 skip = true; 6306 } 6307 6308 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6309 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6310 // as they can be loaded from the archive during runtime. 6311 skip = false; 6312 } 6313 } 6314 if (skip) { 6315 tty->print_cr("skip writing class %s from source %s to classlist file", 6316 _class_name->as_C_string(), stream->source()); 6317 } else { 6318 classlist_file->print_cr("%s", _class_name->as_C_string()); 6319 classlist_file->flush(); 6320 } 6321 } 6322 } 6323 #endif 6324 } 6325 6326 // SUPERKLASS 6327 _super_class_index = stream->get_u2_fast(); 6328 _super_klass = parse_super_class(cp, 6329 _super_class_index, 6330 _need_verify, 6331 CHECK); 6332 6333 // Interfaces 6334 _itfs_len = stream->get_u2_fast(); 6335 parse_interfaces(stream, 6336 _itfs_len, 6337 cp, 6338 &_has_nonstatic_concrete_methods, 6339 CHECK); 6340 6341 assert(_local_interfaces != NULL, "invariant"); 6342 6343 // Fields (offsets are filled in later) 6344 _fac = new FieldAllocationCount(); 6345 parse_fields(stream, 6346 _access_flags.is_interface(), 6347 _fac, 6348 cp, 6349 cp_size, 6350 &_java_fields_count, 6351 CHECK); 6352 6353 assert(_fields != NULL, "invariant"); 6354 6355 // Methods 6356 AccessFlags promoted_flags; 6357 parse_methods(stream, 6358 _access_flags.is_interface(), 6359 &promoted_flags, 6360 &_has_final_method, 6361 &_declares_nonstatic_concrete_methods, 6362 CHECK); 6363 6364 assert(_methods != NULL, "invariant"); 6365 6366 // promote flags from parse_methods() to the klass' flags 6367 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6368 6369 if (_declares_nonstatic_concrete_methods) { 6370 _has_nonstatic_concrete_methods = true; 6371 } 6372 6373 // Additional attributes/annotations 6374 _parsed_annotations = new ClassAnnotationCollector(); 6375 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6376 6377 assert(_inner_classes != NULL, "invariant"); 6378 6379 // Finalize the Annotations metadata object, 6380 // now that all annotation arrays have been created. 6381 create_combined_annotations(CHECK); 6382 6383 // Make sure this is the end of class file stream 6384 guarantee_property(stream->at_eos(), 6385 "Extra bytes at the end of class file %s", 6386 CHECK); 6387 6388 // all bytes in stream read and parsed 6389 } 6390 6391 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6392 ConstantPool* cp, 6393 TRAPS) { 6394 assert(stream != NULL, "invariant"); 6395 assert(stream->at_eos(), "invariant"); 6396 assert(cp != NULL, "invariant"); 6397 assert(_loader_data != NULL, "invariant"); 6398 6399 if (_class_name == vmSymbols::java_lang_Object()) { 6400 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6401 "java.lang.Object cannot implement an interface in class file %s", 6402 CHECK); 6403 } 6404 // We check super class after class file is parsed and format is checked 6405 if (_super_class_index > 0 && NULL ==_super_klass) { 6406 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6407 if (_access_flags.is_interface()) { 6408 // Before attempting to resolve the superclass, check for class format 6409 // errors not checked yet. 6410 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6411 "Interfaces must have java.lang.Object as superclass in class file %s", 6412 CHECK); 6413 } 6414 Handle loader(THREAD, _loader_data->class_loader()); 6415 _super_klass = (const InstanceKlass*) 6416 SystemDictionary::resolve_super_or_fail(_class_name, 6417 super_class_name, 6418 loader, 6419 _protection_domain, 6420 true, 6421 CHECK); 6422 } 6423 6424 if (_super_klass != NULL) { 6425 if (_super_klass->has_nonstatic_concrete_methods()) { 6426 _has_nonstatic_concrete_methods = true; 6427 } 6428 6429 if (_super_klass->is_interface()) { 6430 ResourceMark rm(THREAD); 6431 Exceptions::fthrow( 6432 THREAD_AND_LOCATION, 6433 vmSymbols::java_lang_IncompatibleClassChangeError(), 6434 "class %s has interface %s as super class", 6435 _class_name->as_klass_external_name(), 6436 _super_klass->external_name() 6437 ); 6438 return; 6439 } 6440 // Make sure super class is not final 6441 if (_super_klass->is_final()) { 6442 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6443 } 6444 } 6445 6446 // Compute the transitive list of all unique interfaces implemented by this class 6447 _transitive_interfaces = 6448 compute_transitive_interfaces(_super_klass, 6449 _local_interfaces, 6450 _loader_data, 6451 CHECK); 6452 6453 assert(_transitive_interfaces != NULL, "invariant"); 6454 6455 // sort methods 6456 _method_ordering = sort_methods(_methods); 6457 6458 _all_mirandas = new GrowableArray<Method*>(20); 6459 6460 Handle loader(THREAD, _loader_data->class_loader()); 6461 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6462 &_num_miranda_methods, 6463 _all_mirandas, 6464 _super_klass, 6465 _methods, 6466 _access_flags, 6467 _major_version, 6468 loader, 6469 _class_name, 6470 _local_interfaces, 6471 CHECK); 6472 6473 // Size of Java itable (in words) 6474 _itable_size = _access_flags.is_interface() ? 0 : 6475 klassItable::compute_itable_size(_transitive_interfaces); 6476 6477 assert(_fac != NULL, "invariant"); 6478 assert(_parsed_annotations != NULL, "invariant"); 6479 6480 _field_info = new FieldLayoutInfo(); 6481 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6482 6483 // Compute reference typ 6484 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6485 6486 } 6487 6488 void ClassFileParser::set_klass(InstanceKlass* klass) { 6489 6490 #ifdef ASSERT 6491 if (klass != NULL) { 6492 assert(NULL == _klass, "leaking?"); 6493 } 6494 #endif 6495 6496 _klass = klass; 6497 } 6498 6499 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6500 6501 #ifdef ASSERT 6502 if (klass != NULL) { 6503 assert(NULL == _klass_to_deallocate, "leaking?"); 6504 } 6505 #endif 6506 6507 _klass_to_deallocate = klass; 6508 } 6509 6510 // Caller responsible for ResourceMark 6511 // clone stream with rewound position 6512 const ClassFileStream* ClassFileParser::clone_stream() const { 6513 assert(_stream != NULL, "invariant"); 6514 6515 return _stream->clone(); 6516 } 6517 // ---------------------------------------------------------------------------- 6518 // debugging 6519 6520 #ifdef ASSERT 6521 6522 // return true if class_name contains no '.' (internal format is '/') 6523 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6524 if (class_name != NULL) { 6525 ResourceMark rm; 6526 char* name = class_name->as_C_string(); 6527 return strchr(name, JVM_SIGNATURE_DOT) == NULL; 6528 } else { 6529 return true; 6530 } 6531 } 6532 6533 #endif