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/fieldLayoutBuilder.hpp" 34 #include "classfile/javaClasses.inline.hpp" 35 #include "classfile/moduleEntry.hpp" 36 #include "classfile/packageEntry.hpp" 37 #include "classfile/symbolTable.hpp" 38 #include "classfile/systemDictionary.hpp" 39 #include "classfile/verificationType.hpp" 40 #include "classfile/verifier.hpp" 41 #include "classfile/vmSymbols.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logStream.hpp" 44 #include "memory/allocation.hpp" 45 #include "memory/metadataFactory.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/annotations.hpp" 50 #include "oops/constantPool.inline.hpp" 51 #include "oops/fieldStreams.inline.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/instanceMirrorKlass.hpp" 54 #include "oops/klass.inline.hpp" 55 #include "oops/klassVtable.hpp" 56 #include "oops/metadata.hpp" 57 #include "oops/method.inline.hpp" 58 #include "oops/oop.inline.hpp" 59 #include "oops/recordComponent.hpp" 60 #include "oops/symbol.hpp" 61 #include "prims/jvmtiExport.hpp" 62 #include "prims/jvmtiThreadState.hpp" 63 #include "runtime/arguments.hpp" 64 #include "runtime/fieldDescriptor.inline.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/javaCalls.hpp" 67 #include "runtime/os.hpp" 68 #include "runtime/perfData.hpp" 69 #include "runtime/reflection.hpp" 70 #include "runtime/safepointVerifiers.hpp" 71 #include "runtime/signature.hpp" 72 #include "runtime/timer.hpp" 73 #include "services/classLoadingService.hpp" 74 #include "services/threadService.hpp" 75 #include "utilities/align.hpp" 76 #include "utilities/bitMap.inline.hpp" 77 #include "utilities/copy.hpp" 78 #include "utilities/exceptions.hpp" 79 #include "utilities/globalDefinitions.hpp" 80 #include "utilities/growableArray.hpp" 81 #include "utilities/macros.hpp" 82 #include "utilities/ostream.hpp" 83 #include "utilities/resourceHash.hpp" 84 #include "utilities/utf8.hpp" 85 86 #if INCLUDE_CDS 87 #include "classfile/systemDictionaryShared.hpp" 88 #endif 89 #if INCLUDE_JFR 90 #include "jfr/support/jfrTraceIdExtension.hpp" 91 #endif 92 93 // We generally try to create the oops directly when parsing, rather than 94 // allocating temporary data structures and copying the bytes twice. A 95 // temporary area is only needed when parsing utf8 entries in the constant 96 // pool and when parsing line number tables. 97 98 // We add assert in debug mode when class format is not checked. 99 100 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 101 #define JAVA_MIN_SUPPORTED_VERSION 45 102 #define JAVA_PREVIEW_MINOR_VERSION 65535 103 104 // Used for two backward compatibility reasons: 105 // - to check for new additions to the class file format in JDK1.5 106 // - to check for bug fixes in the format checker in JDK1.5 107 #define JAVA_1_5_VERSION 49 108 109 // Used for backward compatibility reasons: 110 // - to check for javac bug fixes that happened after 1.5 111 // - also used as the max version when running in jdk6 112 #define JAVA_6_VERSION 50 113 114 // Used for backward compatibility reasons: 115 // - to disallow argument and require ACC_STATIC for <clinit> methods 116 #define JAVA_7_VERSION 51 117 118 // Extension method support. 119 #define JAVA_8_VERSION 52 120 121 #define JAVA_9_VERSION 53 122 123 #define JAVA_10_VERSION 54 124 125 #define JAVA_11_VERSION 55 126 127 #define JAVA_12_VERSION 56 128 129 #define JAVA_13_VERSION 57 130 131 #define JAVA_14_VERSION 58 132 133 #define JAVA_15_VERSION 59 134 135 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 136 assert((bad_constant == JVM_CONSTANT_Module || 137 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION, 138 "Unexpected bad constant pool entry"); 139 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 140 } 141 142 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 143 ConstantPool* cp, 144 const int length, 145 TRAPS) { 146 assert(stream != NULL, "invariant"); 147 assert(cp != NULL, "invariant"); 148 149 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 150 // this function (_current can be allocated in a register, with scalar 151 // replacement of aggregates). The _current pointer is copied back to 152 // stream() when this function returns. DON'T call another method within 153 // this method that uses stream(). 154 const ClassFileStream cfs1 = *stream; 155 const ClassFileStream* const cfs = &cfs1; 156 157 assert(cfs->allocated_on_stack(), "should be local"); 158 debug_only(const u1* const old_current = stream->current();) 159 160 // Used for batching symbol allocations. 161 const char* names[SymbolTable::symbol_alloc_batch_size]; 162 int lengths[SymbolTable::symbol_alloc_batch_size]; 163 int indices[SymbolTable::symbol_alloc_batch_size]; 164 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 165 int names_count = 0; 166 167 // parsing Index 0 is unused 168 for (int index = 1; index < length; index++) { 169 // Each of the following case guarantees one more byte in the stream 170 // for the following tag or the access_flags following constant pool, 171 // so we don't need bounds-check for reading tag. 172 const u1 tag = cfs->get_u1_fast(); 173 switch (tag) { 174 case JVM_CONSTANT_Class : { 175 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 176 const u2 name_index = cfs->get_u2_fast(); 177 cp->klass_index_at_put(index, name_index); 178 break; 179 } 180 case JVM_CONSTANT_Fieldref: { 181 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 182 const u2 class_index = cfs->get_u2_fast(); 183 const u2 name_and_type_index = cfs->get_u2_fast(); 184 cp->field_at_put(index, class_index, name_and_type_index); 185 break; 186 } 187 case JVM_CONSTANT_Methodref: { 188 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 189 const u2 class_index = cfs->get_u2_fast(); 190 const u2 name_and_type_index = cfs->get_u2_fast(); 191 cp->method_at_put(index, class_index, name_and_type_index); 192 break; 193 } 194 case JVM_CONSTANT_InterfaceMethodref: { 195 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 196 const u2 class_index = cfs->get_u2_fast(); 197 const u2 name_and_type_index = cfs->get_u2_fast(); 198 cp->interface_method_at_put(index, class_index, name_and_type_index); 199 break; 200 } 201 case JVM_CONSTANT_String : { 202 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 203 const u2 string_index = cfs->get_u2_fast(); 204 cp->string_index_at_put(index, string_index); 205 break; 206 } 207 case JVM_CONSTANT_MethodHandle : 208 case JVM_CONSTANT_MethodType: { 209 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 210 classfile_parse_error( 211 "Class file version does not support constant tag %u in class file %s", 212 tag, CHECK); 213 } 214 if (tag == JVM_CONSTANT_MethodHandle) { 215 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 216 const u1 ref_kind = cfs->get_u1_fast(); 217 const u2 method_index = cfs->get_u2_fast(); 218 cp->method_handle_index_at_put(index, ref_kind, method_index); 219 } 220 else if (tag == JVM_CONSTANT_MethodType) { 221 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 222 const u2 signature_index = cfs->get_u2_fast(); 223 cp->method_type_index_at_put(index, signature_index); 224 } 225 else { 226 ShouldNotReachHere(); 227 } 228 break; 229 } 230 case JVM_CONSTANT_Dynamic : { 231 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 232 classfile_parse_error( 233 "Class file version does not support constant tag %u in class file %s", 234 tag, CHECK); 235 } 236 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 237 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 238 const u2 name_and_type_index = cfs->get_u2_fast(); 239 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 240 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 241 } 242 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 243 break; 244 } 245 case JVM_CONSTANT_InvokeDynamic : { 246 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 247 classfile_parse_error( 248 "Class file version does not support constant tag %u in class file %s", 249 tag, CHECK); 250 } 251 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 252 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 253 const u2 name_and_type_index = cfs->get_u2_fast(); 254 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 255 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 256 } 257 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 258 break; 259 } 260 case JVM_CONSTANT_Integer: { 261 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 262 const u4 bytes = cfs->get_u4_fast(); 263 cp->int_at_put(index, (jint)bytes); 264 break; 265 } 266 case JVM_CONSTANT_Float: { 267 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 268 const u4 bytes = cfs->get_u4_fast(); 269 cp->float_at_put(index, *(jfloat*)&bytes); 270 break; 271 } 272 case JVM_CONSTANT_Long: { 273 // A mangled type might cause you to overrun allocated memory 274 guarantee_property(index + 1 < length, 275 "Invalid constant pool entry %u in class file %s", 276 index, 277 CHECK); 278 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 279 const u8 bytes = cfs->get_u8_fast(); 280 cp->long_at_put(index, bytes); 281 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 282 break; 283 } 284 case JVM_CONSTANT_Double: { 285 // A mangled type might cause you to overrun allocated memory 286 guarantee_property(index+1 < length, 287 "Invalid constant pool entry %u in class file %s", 288 index, 289 CHECK); 290 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 291 const u8 bytes = cfs->get_u8_fast(); 292 cp->double_at_put(index, *(jdouble*)&bytes); 293 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 294 break; 295 } 296 case JVM_CONSTANT_NameAndType: { 297 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 298 const u2 name_index = cfs->get_u2_fast(); 299 const u2 signature_index = cfs->get_u2_fast(); 300 cp->name_and_type_at_put(index, name_index, signature_index); 301 break; 302 } 303 case JVM_CONSTANT_Utf8 : { 304 cfs->guarantee_more(2, CHECK); // utf8_length 305 u2 utf8_length = cfs->get_u2_fast(); 306 const u1* utf8_buffer = cfs->current(); 307 assert(utf8_buffer != NULL, "null utf8 buffer"); 308 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 309 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 310 cfs->skip_u1_fast(utf8_length); 311 312 // Before storing the symbol, make sure it's legal 313 if (_need_verify) { 314 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 315 } 316 317 if (has_cp_patch_at(index)) { 318 Handle patch = clear_cp_patch_at(index); 319 guarantee_property(java_lang_String::is_instance(patch()), 320 "Illegal utf8 patch at %d in class file %s", 321 index, 322 CHECK); 323 const char* const str = java_lang_String::as_utf8_string(patch()); 324 // (could use java_lang_String::as_symbol instead, but might as well batch them) 325 utf8_buffer = (const u1*) str; 326 utf8_length = (u2) strlen(str); 327 } 328 329 unsigned int hash; 330 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 331 utf8_length, 332 hash); 333 if (result == NULL) { 334 names[names_count] = (const char*)utf8_buffer; 335 lengths[names_count] = utf8_length; 336 indices[names_count] = index; 337 hashValues[names_count++] = hash; 338 if (names_count == SymbolTable::symbol_alloc_batch_size) { 339 SymbolTable::new_symbols(_loader_data, 340 constantPoolHandle(THREAD, cp), 341 names_count, 342 names, 343 lengths, 344 indices, 345 hashValues); 346 names_count = 0; 347 } 348 } else { 349 cp->symbol_at_put(index, result); 350 } 351 break; 352 } 353 case JVM_CONSTANT_Module: 354 case JVM_CONSTANT_Package: { 355 // Record that an error occurred in these two cases but keep parsing so 356 // that ACC_Module can be checked for in the access_flags. Need to 357 // throw NoClassDefFoundError in that case. 358 if (_major_version >= JAVA_9_VERSION) { 359 cfs->guarantee_more(3, CHECK); 360 cfs->get_u2_fast(); 361 set_class_bad_constant_seen(tag); 362 break; 363 } 364 } 365 default: { 366 classfile_parse_error("Unknown constant tag %u in class file %s", 367 tag, 368 CHECK); 369 break; 370 } 371 } // end of switch(tag) 372 } // end of for 373 374 // Allocate the remaining symbols 375 if (names_count > 0) { 376 SymbolTable::new_symbols(_loader_data, 377 constantPoolHandle(THREAD, cp), 378 names_count, 379 names, 380 lengths, 381 indices, 382 hashValues); 383 } 384 385 // Copy _current pointer of local copy back to stream. 386 assert(stream->current() == old_current, "non-exclusive use of stream"); 387 stream->set_current(cfs1.current()); 388 389 } 390 391 static inline bool valid_cp_range(int index, int length) { 392 return (index > 0 && index < length); 393 } 394 395 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 396 assert(cp != NULL, "invariant"); 397 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 398 return cp->symbol_at(index); 399 } 400 return NULL; 401 } 402 403 #ifdef ASSERT 404 PRAGMA_DIAG_PUSH 405 PRAGMA_FORMAT_NONLITERAL_IGNORED 406 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 407 ResourceMark rm(THREAD); 408 fatal(msg, _class_name->as_C_string()); 409 } 410 411 void ClassFileParser::report_assert_property_failure(const char* msg, 412 int index, 413 TRAPS) const { 414 ResourceMark rm(THREAD); 415 fatal(msg, index, _class_name->as_C_string()); 416 } 417 PRAGMA_DIAG_POP 418 #endif 419 420 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 421 ConstantPool* const cp, 422 const int length, 423 TRAPS) { 424 assert(cp != NULL, "invariant"); 425 assert(stream != NULL, "invariant"); 426 427 // parsing constant pool entries 428 parse_constant_pool_entries(stream, cp, length, CHECK); 429 if (class_bad_constant_seen() != 0) { 430 // a bad CP entry has been detected previously so stop parsing and just return. 431 return; 432 } 433 434 int index = 1; // declared outside of loops for portability 435 int num_klasses = 0; 436 437 // first verification pass - validate cross references 438 // and fixup class and string constants 439 for (index = 1; index < length; index++) { // Index 0 is unused 440 const jbyte tag = cp->tag_at(index).value(); 441 switch (tag) { 442 case JVM_CONSTANT_Class: { 443 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 444 break; 445 } 446 case JVM_CONSTANT_Fieldref: 447 // fall through 448 case JVM_CONSTANT_Methodref: 449 // fall through 450 case JVM_CONSTANT_InterfaceMethodref: { 451 if (!_need_verify) break; 452 const int klass_ref_index = cp->klass_ref_index_at(index); 453 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 454 check_property(valid_klass_reference_at(klass_ref_index), 455 "Invalid constant pool index %u in class file %s", 456 klass_ref_index, CHECK); 457 check_property(valid_cp_range(name_and_type_ref_index, length) && 458 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 459 "Invalid constant pool index %u in class file %s", 460 name_and_type_ref_index, CHECK); 461 break; 462 } 463 case JVM_CONSTANT_String: { 464 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 465 break; 466 } 467 case JVM_CONSTANT_Integer: 468 break; 469 case JVM_CONSTANT_Float: 470 break; 471 case JVM_CONSTANT_Long: 472 case JVM_CONSTANT_Double: { 473 index++; 474 check_property( 475 (index < length && cp->tag_at(index).is_invalid()), 476 "Improper constant pool long/double index %u in class file %s", 477 index, CHECK); 478 break; 479 } 480 case JVM_CONSTANT_NameAndType: { 481 if (!_need_verify) break; 482 const int name_ref_index = cp->name_ref_index_at(index); 483 const int signature_ref_index = cp->signature_ref_index_at(index); 484 check_property(valid_symbol_at(name_ref_index), 485 "Invalid constant pool index %u in class file %s", 486 name_ref_index, CHECK); 487 check_property(valid_symbol_at(signature_ref_index), 488 "Invalid constant pool index %u in class file %s", 489 signature_ref_index, CHECK); 490 break; 491 } 492 case JVM_CONSTANT_Utf8: 493 break; 494 case JVM_CONSTANT_UnresolvedClass: // fall-through 495 case JVM_CONSTANT_UnresolvedClassInError: { 496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 497 break; 498 } 499 case JVM_CONSTANT_ClassIndex: { 500 const int class_index = cp->klass_index_at(index); 501 check_property(valid_symbol_at(class_index), 502 "Invalid constant pool index %u in class file %s", 503 class_index, CHECK); 504 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 505 break; 506 } 507 case JVM_CONSTANT_StringIndex: { 508 const int string_index = cp->string_index_at(index); 509 check_property(valid_symbol_at(string_index), 510 "Invalid constant pool index %u in class file %s", 511 string_index, CHECK); 512 Symbol* const sym = cp->symbol_at(string_index); 513 cp->unresolved_string_at_put(index, sym); 514 break; 515 } 516 case JVM_CONSTANT_MethodHandle: { 517 const int ref_index = cp->method_handle_index_at(index); 518 check_property(valid_cp_range(ref_index, length), 519 "Invalid constant pool index %u in class file %s", 520 ref_index, CHECK); 521 const constantTag tag = cp->tag_at(ref_index); 522 const int ref_kind = cp->method_handle_ref_kind_at(index); 523 524 switch (ref_kind) { 525 case JVM_REF_getField: 526 case JVM_REF_getStatic: 527 case JVM_REF_putField: 528 case JVM_REF_putStatic: { 529 check_property( 530 tag.is_field(), 531 "Invalid constant pool index %u in class file %s (not a field)", 532 ref_index, CHECK); 533 break; 534 } 535 case JVM_REF_invokeVirtual: 536 case JVM_REF_newInvokeSpecial: { 537 check_property( 538 tag.is_method(), 539 "Invalid constant pool index %u in class file %s (not a method)", 540 ref_index, CHECK); 541 break; 542 } 543 case JVM_REF_invokeStatic: 544 case JVM_REF_invokeSpecial: { 545 check_property( 546 tag.is_method() || 547 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 548 "Invalid constant pool index %u in class file %s (not a method)", 549 ref_index, CHECK); 550 break; 551 } 552 case JVM_REF_invokeInterface: { 553 check_property( 554 tag.is_interface_method(), 555 "Invalid constant pool index %u in class file %s (not an interface method)", 556 ref_index, CHECK); 557 break; 558 } 559 default: { 560 classfile_parse_error( 561 "Bad method handle kind at constant pool index %u in class file %s", 562 index, CHECK); 563 } 564 } // switch(refkind) 565 // Keep the ref_index unchanged. It will be indirected at link-time. 566 break; 567 } // case MethodHandle 568 case JVM_CONSTANT_MethodType: { 569 const int ref_index = cp->method_type_index_at(index); 570 check_property(valid_symbol_at(ref_index), 571 "Invalid constant pool index %u in class file %s", 572 ref_index, CHECK); 573 break; 574 } 575 case JVM_CONSTANT_Dynamic: { 576 const int name_and_type_ref_index = 577 cp->bootstrap_name_and_type_ref_index_at(index); 578 579 check_property(valid_cp_range(name_and_type_ref_index, length) && 580 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 581 "Invalid constant pool index %u in class file %s", 582 name_and_type_ref_index, CHECK); 583 // bootstrap specifier index must be checked later, 584 // when BootstrapMethods attr is available 585 586 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 587 cp->set_has_dynamic_constant(); 588 break; 589 } 590 case JVM_CONSTANT_InvokeDynamic: { 591 const int name_and_type_ref_index = 592 cp->bootstrap_name_and_type_ref_index_at(index); 593 594 check_property(valid_cp_range(name_and_type_ref_index, length) && 595 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 596 "Invalid constant pool index %u in class file %s", 597 name_and_type_ref_index, CHECK); 598 // bootstrap specifier index must be checked later, 599 // when BootstrapMethods attr is available 600 break; 601 } 602 default: { 603 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 604 ShouldNotReachHere(); 605 break; 606 } 607 } // switch(tag) 608 } // end of for 609 610 _first_patched_klass_resolved_index = num_klasses; 611 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 612 613 if (_cp_patches != NULL) { 614 // need to treat this_class specially... 615 616 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 617 // for now. These will be replaced with actual names of the patched classes in patch_class(). 618 Symbol* s = vmSymbols::star_name(); 619 for (int n=_orig_cp_size; n<cp->length(); n++) { 620 cp->symbol_at_put(n, s); 621 } 622 623 int this_class_index; 624 { 625 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 626 const u1* const mark = stream->current(); 627 stream->skip_u2_fast(1); // skip flags 628 this_class_index = stream->get_u2_fast(); 629 stream->set_current(mark); // revert to mark 630 } 631 632 for (index = 1; index < length; index++) { // Index 0 is unused 633 if (has_cp_patch_at(index)) { 634 guarantee_property(index != this_class_index, 635 "Illegal constant pool patch to self at %d in class file %s", 636 index, CHECK); 637 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 638 } 639 } 640 } 641 642 if (!_need_verify) { 643 return; 644 } 645 646 // second verification pass - checks the strings are of the right format. 647 // but not yet to the other entries 648 for (index = 1; index < length; index++) { 649 const jbyte tag = cp->tag_at(index).value(); 650 switch (tag) { 651 case JVM_CONSTANT_UnresolvedClass: { 652 const Symbol* const class_name = cp->klass_name_at(index); 653 // check the name, even if _cp_patches will overwrite it 654 verify_legal_class_name(class_name, CHECK); 655 break; 656 } 657 case JVM_CONSTANT_NameAndType: { 658 if (_need_verify) { 659 const int sig_index = cp->signature_ref_index_at(index); 660 const int name_index = cp->name_ref_index_at(index); 661 const Symbol* const name = cp->symbol_at(name_index); 662 const Symbol* const sig = cp->symbol_at(sig_index); 663 guarantee_property(sig->utf8_length() != 0, 664 "Illegal zero length constant pool entry at %d in class %s", 665 sig_index, CHECK); 666 guarantee_property(name->utf8_length() != 0, 667 "Illegal zero length constant pool entry at %d in class %s", 668 name_index, CHECK); 669 670 if (Signature::is_method(sig)) { 671 // Format check method name and signature 672 verify_legal_method_name(name, CHECK); 673 verify_legal_method_signature(name, sig, CHECK); 674 } else { 675 // Format check field name and signature 676 verify_legal_field_name(name, CHECK); 677 verify_legal_field_signature(name, sig, CHECK); 678 } 679 } 680 break; 681 } 682 case JVM_CONSTANT_Dynamic: { 683 const int name_and_type_ref_index = 684 cp->name_and_type_ref_index_at(index); 685 // already verified to be utf8 686 const int name_ref_index = 687 cp->name_ref_index_at(name_and_type_ref_index); 688 // already verified to be utf8 689 const int signature_ref_index = 690 cp->signature_ref_index_at(name_and_type_ref_index); 691 const Symbol* const name = cp->symbol_at(name_ref_index); 692 const Symbol* const signature = cp->symbol_at(signature_ref_index); 693 if (_need_verify) { 694 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 695 // Need only to be sure signature is the right type. 696 if (Signature::is_method(signature)) { 697 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 698 } 699 } 700 break; 701 } 702 case JVM_CONSTANT_InvokeDynamic: 703 case JVM_CONSTANT_Fieldref: 704 case JVM_CONSTANT_Methodref: 705 case JVM_CONSTANT_InterfaceMethodref: { 706 const int name_and_type_ref_index = 707 cp->name_and_type_ref_index_at(index); 708 // already verified to be utf8 709 const int name_ref_index = 710 cp->name_ref_index_at(name_and_type_ref_index); 711 // already verified to be utf8 712 const int signature_ref_index = 713 cp->signature_ref_index_at(name_and_type_ref_index); 714 const Symbol* const name = cp->symbol_at(name_ref_index); 715 const Symbol* const signature = cp->symbol_at(signature_ref_index); 716 if (tag == JVM_CONSTANT_Fieldref) { 717 if (_need_verify) { 718 // Field name and signature are verified above, when iterating NameAndType_info. 719 // Need only to be sure signature is non-zero length and the right type. 720 if (Signature::is_method(signature)) { 721 throwIllegalSignature("Field", name, signature, CHECK); 722 } 723 } 724 } else { 725 if (_need_verify) { 726 // Method name and signature are verified above, when iterating NameAndType_info. 727 // Need only to be sure signature is non-zero length and the right type. 728 if (!Signature::is_method(signature)) { 729 throwIllegalSignature("Method", name, signature, CHECK); 730 } 731 } 732 // 4509014: If a class method name begins with '<', it must be "<init>" 733 const unsigned int name_len = name->utf8_length(); 734 if (tag == JVM_CONSTANT_Methodref && 735 name_len != 0 && 736 name->char_at(0) == JVM_SIGNATURE_SPECIAL && 737 name != vmSymbols::object_initializer_name()) { 738 classfile_parse_error( 739 "Bad method name at constant pool index %u in class file %s", 740 name_ref_index, CHECK); 741 } 742 } 743 break; 744 } 745 case JVM_CONSTANT_MethodHandle: { 746 const int ref_index = cp->method_handle_index_at(index); 747 const int ref_kind = cp->method_handle_ref_kind_at(index); 748 switch (ref_kind) { 749 case JVM_REF_invokeVirtual: 750 case JVM_REF_invokeStatic: 751 case JVM_REF_invokeSpecial: 752 case JVM_REF_newInvokeSpecial: { 753 const int name_and_type_ref_index = 754 cp->name_and_type_ref_index_at(ref_index); 755 const int name_ref_index = 756 cp->name_ref_index_at(name_and_type_ref_index); 757 const Symbol* const name = cp->symbol_at(name_ref_index); 758 if (ref_kind == JVM_REF_newInvokeSpecial) { 759 if (name != vmSymbols::object_initializer_name()) { 760 classfile_parse_error( 761 "Bad constructor name at constant pool index %u in class file %s", 762 name_ref_index, CHECK); 763 } 764 } else { 765 if (name == vmSymbols::object_initializer_name()) { 766 classfile_parse_error( 767 "Bad method name at constant pool index %u in class file %s", 768 name_ref_index, CHECK); 769 } 770 } 771 break; 772 } 773 // Other ref_kinds are already fully checked in previous pass. 774 } // switch(ref_kind) 775 break; 776 } 777 case JVM_CONSTANT_MethodType: { 778 const Symbol* const no_name = vmSymbols::type_name(); // place holder 779 const Symbol* const signature = cp->method_type_signature_at(index); 780 verify_legal_method_signature(no_name, signature, CHECK); 781 break; 782 } 783 case JVM_CONSTANT_Utf8: { 784 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 785 } 786 } // switch(tag) 787 } // end of for 788 } 789 790 Handle ClassFileParser::clear_cp_patch_at(int index) { 791 Handle patch = cp_patch_at(index); 792 _cp_patches->at_put(index, Handle()); 793 assert(!has_cp_patch_at(index), ""); 794 return patch; 795 } 796 797 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) { 798 int name_index = _orig_cp_size + _num_patched_klasses; 799 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses; 800 801 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name); 802 _num_patched_klasses ++; 803 } 804 805 void ClassFileParser::patch_constant_pool(ConstantPool* cp, 806 int index, 807 Handle patch, 808 TRAPS) { 809 assert(cp != NULL, "invariant"); 810 811 BasicType patch_type = T_VOID; 812 813 switch (cp->tag_at(index).value()) { 814 815 case JVM_CONSTANT_UnresolvedClass: { 816 // Patching a class means pre-resolving it. 817 // The name in the constant pool is ignored. 818 if (java_lang_Class::is_instance(patch())) { 819 guarantee_property(!java_lang_Class::is_primitive(patch()), 820 "Illegal class patch at %d in class file %s", 821 index, CHECK); 822 Klass* k = java_lang_Class::as_Klass(patch()); 823 patch_class(cp, index, k, k->name()); 824 } else { 825 guarantee_property(java_lang_String::is_instance(patch()), 826 "Illegal class patch at %d in class file %s", 827 index, CHECK); 828 Symbol* const name = java_lang_String::as_symbol(patch()); 829 patch_class(cp, index, NULL, name); 830 } 831 break; 832 } 833 834 case JVM_CONSTANT_String: { 835 // skip this patch and don't clear it. Needs the oop array for resolved 836 // references to be created first. 837 return; 838 } 839 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 840 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 841 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 842 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 843 patch_prim: 844 { 845 jvalue value; 846 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 847 guarantee_property(value_type == patch_type, 848 "Illegal primitive patch at %d in class file %s", 849 index, CHECK); 850 switch (value_type) { 851 case T_INT: cp->int_at_put(index, value.i); break; 852 case T_FLOAT: cp->float_at_put(index, value.f); break; 853 case T_LONG: cp->long_at_put(index, value.j); break; 854 case T_DOUBLE: cp->double_at_put(index, value.d); break; 855 default: assert(false, ""); 856 } 857 } // end patch_prim label 858 break; 859 860 default: { 861 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 862 guarantee_property(!has_cp_patch_at(index), 863 "Illegal unexpected patch at %d in class file %s", 864 index, CHECK); 865 return; 866 } 867 } // end of switch(tag) 868 869 // On fall-through, mark the patch as used. 870 clear_cp_patch_at(index); 871 } 872 class NameSigHash: public ResourceObj { 873 public: 874 const Symbol* _name; // name 875 const Symbol* _sig; // signature 876 NameSigHash* _next; // Next entry in hash table 877 }; 878 879 static const int HASH_ROW_SIZE = 256; 880 881 static unsigned int hash(const Symbol* name, const Symbol* sig) { 882 unsigned int raw_hash = 0; 883 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 884 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 885 886 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 887 } 888 889 890 static void initialize_hashtable(NameSigHash** table) { 891 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 892 } 893 // Return false if the name/sig combination is found in table. 894 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 895 // The old format checker uses heap sort to find duplicates. 896 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 897 // of table since we don't expect Symbol*'s to move. 898 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 899 assert(name != NULL, "name in constant pool is NULL"); 900 901 // First lookup for duplicates 902 int index = hash(name, sig); 903 NameSigHash* entry = table[index]; 904 while (entry != NULL) { 905 if (entry->_name == name && entry->_sig == sig) { 906 return false; 907 } 908 entry = entry->_next; 909 } 910 911 // No duplicate is found, allocate a new entry and fill it. 912 entry = new NameSigHash(); 913 entry->_name = name; 914 entry->_sig = sig; 915 916 // Insert into hash table 917 entry->_next = table[index]; 918 table[index] = entry; 919 920 return true; 921 } 922 923 // Side-effects: populates the _local_interfaces field 924 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 925 const int itfs_len, 926 ConstantPool* const cp, 927 bool* const has_nonstatic_concrete_methods, 928 TRAPS) { 929 assert(stream != NULL, "invariant"); 930 assert(cp != NULL, "invariant"); 931 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 932 933 if (itfs_len == 0) { 934 _local_interfaces = Universe::the_empty_instance_klass_array(); 935 } else { 936 assert(itfs_len > 0, "only called for len>0"); 937 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK); 938 939 int index; 940 for (index = 0; index < itfs_len; index++) { 941 const u2 interface_index = stream->get_u2(CHECK); 942 Klass* interf; 943 check_property( 944 valid_klass_reference_at(interface_index), 945 "Interface name has bad constant pool index %u in class file %s", 946 interface_index, CHECK); 947 if (cp->tag_at(interface_index).is_klass()) { 948 interf = cp->resolved_klass_at(interface_index); 949 } else { 950 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 951 952 // Don't need to check legal name because it's checked when parsing constant pool. 953 // But need to make sure it's not an array type. 954 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 955 "Bad interface name in class file %s", CHECK); 956 957 // Call resolve_super so classcircularity is checked 958 interf = SystemDictionary::resolve_super_or_fail( 959 _class_name, 960 unresolved_klass, 961 Handle(THREAD, _loader_data->class_loader()), 962 _protection_domain, 963 false, 964 CHECK); 965 } 966 967 if (!interf->is_interface()) { 968 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 969 err_msg("class %s can not implement %s, because it is not an interface (%s)", 970 _class_name->as_klass_external_name(), 971 interf->external_name(), 972 interf->class_in_module_of_loader())); 973 } 974 975 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 976 *has_nonstatic_concrete_methods = true; 977 } 978 _local_interfaces->at_put(index, InstanceKlass::cast(interf)); 979 } 980 981 if (!_need_verify || itfs_len <= 1) { 982 return; 983 } 984 985 // Check if there's any duplicates in interfaces 986 ResourceMark rm(THREAD); 987 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 988 NameSigHash*, 989 HASH_ROW_SIZE); 990 initialize_hashtable(interface_names); 991 bool dup = false; 992 const Symbol* name = NULL; 993 { 994 debug_only(NoSafepointVerifier nsv;) 995 for (index = 0; index < itfs_len; index++) { 996 const InstanceKlass* const k = _local_interfaces->at(index); 997 name = k->name(); 998 // If no duplicates, add (name, NULL) in hashtable interface_names. 999 if (!put_after_lookup(name, NULL, interface_names)) { 1000 dup = true; 1001 break; 1002 } 1003 } 1004 } 1005 if (dup) { 1006 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 1007 name->as_C_string(), CHECK); 1008 } 1009 } 1010 } 1011 1012 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1013 int constantvalue_index, 1014 int signature_index, 1015 TRAPS) const { 1016 // Make sure the constant pool entry is of a type appropriate to this field 1017 guarantee_property( 1018 (constantvalue_index > 0 && 1019 constantvalue_index < cp->length()), 1020 "Bad initial value index %u in ConstantValue attribute in class file %s", 1021 constantvalue_index, CHECK); 1022 1023 const constantTag value_type = cp->tag_at(constantvalue_index); 1024 switch(cp->basic_type_for_signature_at(signature_index)) { 1025 case T_LONG: { 1026 guarantee_property(value_type.is_long(), 1027 "Inconsistent constant value type in class file %s", 1028 CHECK); 1029 break; 1030 } 1031 case T_FLOAT: { 1032 guarantee_property(value_type.is_float(), 1033 "Inconsistent constant value type in class file %s", 1034 CHECK); 1035 break; 1036 } 1037 case T_DOUBLE: { 1038 guarantee_property(value_type.is_double(), 1039 "Inconsistent constant value type in class file %s", 1040 CHECK); 1041 break; 1042 } 1043 case T_BYTE: 1044 case T_CHAR: 1045 case T_SHORT: 1046 case T_BOOLEAN: 1047 case T_INT: { 1048 guarantee_property(value_type.is_int(), 1049 "Inconsistent constant value type in class file %s", 1050 CHECK); 1051 break; 1052 } 1053 case T_OBJECT: { 1054 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1055 && value_type.is_string()), 1056 "Bad string initial value in class file %s", 1057 CHECK); 1058 break; 1059 } 1060 default: { 1061 classfile_parse_error("Unable to set initial value %u in class file %s", 1062 constantvalue_index, 1063 CHECK); 1064 } 1065 } 1066 } 1067 1068 class AnnotationCollector : public ResourceObj{ 1069 public: 1070 enum Location { _in_field, _in_method, _in_class }; 1071 enum ID { 1072 _unknown = 0, 1073 _method_CallerSensitive, 1074 _method_ForceInline, 1075 _method_DontInline, 1076 _method_InjectedProfile, 1077 _method_LambdaForm_Compiled, 1078 _method_Hidden, 1079 _method_HotSpotIntrinsicCandidate, 1080 _jdk_internal_vm_annotation_Contended, 1081 _field_Stable, 1082 _jdk_internal_vm_annotation_ReservedStackAccess, 1083 _annotation_LIMIT 1084 }; 1085 const Location _location; 1086 int _annotations_present; 1087 u2 _contended_group; 1088 1089 AnnotationCollector(Location location) 1090 : _location(location), _annotations_present(0) 1091 { 1092 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1093 } 1094 // If this annotation name has an ID, report it (or _none). 1095 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, const bool can_access_vm_annotations); 1096 // Set the annotation name: 1097 void set_annotation(ID id) { 1098 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1099 _annotations_present |= nth_bit((int)id); 1100 } 1101 1102 void remove_annotation(ID id) { 1103 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1104 _annotations_present &= ~nth_bit((int)id); 1105 } 1106 1107 // Report if the annotation is present. 1108 bool has_any_annotations() const { return _annotations_present != 0; } 1109 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1110 1111 void set_contended_group(u2 group) { _contended_group = group; } 1112 u2 contended_group() const { return _contended_group; } 1113 1114 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1115 1116 void set_stable(bool stable) { set_annotation(_field_Stable); } 1117 bool is_stable() const { return has_annotation(_field_Stable); } 1118 }; 1119 1120 // This class also doubles as a holder for metadata cleanup. 1121 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1122 private: 1123 ClassLoaderData* _loader_data; 1124 AnnotationArray* _field_annotations; 1125 AnnotationArray* _field_type_annotations; 1126 public: 1127 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1128 AnnotationCollector(_in_field), 1129 _loader_data(loader_data), 1130 _field_annotations(NULL), 1131 _field_type_annotations(NULL) {} 1132 ~FieldAnnotationCollector(); 1133 void apply_to(FieldInfo* f); 1134 AnnotationArray* field_annotations() { return _field_annotations; } 1135 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1136 1137 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1138 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1139 }; 1140 1141 class MethodAnnotationCollector : public AnnotationCollector{ 1142 public: 1143 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1144 void apply_to(const methodHandle& m); 1145 }; 1146 1147 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1148 public: 1149 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1150 void apply_to(InstanceKlass* ik); 1151 }; 1152 1153 1154 static int skip_annotation_value(const u1*, int, int); // fwd decl 1155 1156 // Safely increment index by val if does not pass limit 1157 #define SAFE_ADD(index, limit, val) \ 1158 if (index >= limit - val) return limit; \ 1159 index += val; 1160 1161 // Skip an annotation. Return >=limit if there is any problem. 1162 static int skip_annotation(const u1* buffer, int limit, int index) { 1163 assert(buffer != NULL, "invariant"); 1164 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1165 // value := switch (tag:u1) { ... } 1166 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1167 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1168 while (--nmem >= 0 && index < limit) { 1169 SAFE_ADD(index, limit, 2); // skip member 1170 index = skip_annotation_value(buffer, limit, index); 1171 } 1172 return index; 1173 } 1174 1175 // Skip an annotation value. Return >=limit if there is any problem. 1176 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1177 assert(buffer != NULL, "invariant"); 1178 1179 // value := switch (tag:u1) { 1180 // case B, C, I, S, Z, D, F, J, c: con:u2; 1181 // case e: e_class:u2 e_name:u2; 1182 // case s: s_con:u2; 1183 // case [: do(nval:u2) {value}; 1184 // case @: annotation; 1185 // case s: s_con:u2; 1186 // } 1187 SAFE_ADD(index, limit, 1); // read tag 1188 const u1 tag = buffer[index - 1]; 1189 switch (tag) { 1190 case 'B': 1191 case 'C': 1192 case 'I': 1193 case 'S': 1194 case 'Z': 1195 case 'D': 1196 case 'F': 1197 case 'J': 1198 case 'c': 1199 case 's': 1200 SAFE_ADD(index, limit, 2); // skip con or s_con 1201 break; 1202 case 'e': 1203 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1204 break; 1205 case '[': 1206 { 1207 SAFE_ADD(index, limit, 2); // read nval 1208 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1209 while (--nval >= 0 && index < limit) { 1210 index = skip_annotation_value(buffer, limit, index); 1211 } 1212 } 1213 break; 1214 case '@': 1215 index = skip_annotation(buffer, limit, index); 1216 break; 1217 default: 1218 return limit; // bad tag byte 1219 } 1220 return index; 1221 } 1222 1223 // Sift through annotations, looking for those significant to the VM: 1224 static void parse_annotations(const ConstantPool* const cp, 1225 const u1* buffer, int limit, 1226 AnnotationCollector* coll, 1227 ClassLoaderData* loader_data, 1228 const bool can_access_vm_annotations, 1229 TRAPS) { 1230 1231 assert(cp != NULL, "invariant"); 1232 assert(buffer != NULL, "invariant"); 1233 assert(coll != NULL, "invariant"); 1234 assert(loader_data != NULL, "invariant"); 1235 1236 // annotations := do(nann:u2) {annotation} 1237 int index = 2; // read nann 1238 if (index >= limit) return; 1239 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1240 enum { // initial annotation layout 1241 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1242 count_off = 2, // u2 such as 1 (one value) 1243 member_off = 4, // utf8 such as 'value' 1244 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1245 e_tag_val = 'e', 1246 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1247 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1248 e_size = 11, // end of 'e' annotation 1249 c_tag_val = 'c', // payload is type 1250 c_con_off = 7, // utf8 payload, such as 'I' 1251 c_size = 9, // end of 'c' annotation 1252 s_tag_val = 's', // payload is String 1253 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1254 s_size = 9, 1255 min_size = 6 // smallest possible size (zero members) 1256 }; 1257 // Cannot add min_size to index in case of overflow MAX_INT 1258 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1259 int index0 = index; 1260 index = skip_annotation(buffer, limit, index); 1261 const u1* const abase = buffer + index0; 1262 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1263 const int count = Bytes::get_Java_u2((address)abase + count_off); 1264 const Symbol* const aname = check_symbol_at(cp, atype); 1265 if (aname == NULL) break; // invalid annotation name 1266 const Symbol* member = NULL; 1267 if (count >= 1) { 1268 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1269 member = check_symbol_at(cp, member_index); 1270 if (member == NULL) break; // invalid member name 1271 } 1272 1273 // Here is where parsing particular annotations will take place. 1274 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations); 1275 if (AnnotationCollector::_unknown == id) continue; 1276 coll->set_annotation(id); 1277 1278 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1279 // @Contended can optionally specify the contention group. 1280 // 1281 // Contended group defines the equivalence class over the fields: 1282 // the fields within the same contended group are not treated distinct. 1283 // The only exception is default group, which does not incur the 1284 // equivalence. Naturally, contention group for classes is meaningless. 1285 // 1286 // While the contention group is specified as String, annotation 1287 // values are already interned, and we might as well use the constant 1288 // pool index as the group tag. 1289 // 1290 u2 group_index = 0; // default contended group 1291 if (count == 1 1292 && s_size == (index - index0) // match size 1293 && s_tag_val == *(abase + tag_off) 1294 && member == vmSymbols::value_name()) { 1295 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1296 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1297 group_index = 0; // default contended group 1298 } 1299 } 1300 coll->set_contended_group(group_index); 1301 } 1302 } 1303 } 1304 1305 1306 // Parse attributes for a field. 1307 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1308 u2 attributes_count, 1309 bool is_static, u2 signature_index, 1310 u2* const constantvalue_index_addr, 1311 bool* const is_synthetic_addr, 1312 u2* const generic_signature_index_addr, 1313 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1314 TRAPS) { 1315 assert(cfs != NULL, "invariant"); 1316 assert(constantvalue_index_addr != NULL, "invariant"); 1317 assert(is_synthetic_addr != NULL, "invariant"); 1318 assert(generic_signature_index_addr != NULL, "invariant"); 1319 assert(parsed_annotations != NULL, "invariant"); 1320 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1321 1322 u2 constantvalue_index = 0; 1323 u2 generic_signature_index = 0; 1324 bool is_synthetic = false; 1325 const u1* runtime_visible_annotations = NULL; 1326 int runtime_visible_annotations_length = 0; 1327 const u1* runtime_invisible_annotations = NULL; 1328 int runtime_invisible_annotations_length = 0; 1329 const u1* runtime_visible_type_annotations = NULL; 1330 int runtime_visible_type_annotations_length = 0; 1331 const u1* runtime_invisible_type_annotations = NULL; 1332 int runtime_invisible_type_annotations_length = 0; 1333 bool runtime_invisible_annotations_exists = false; 1334 bool runtime_invisible_type_annotations_exists = false; 1335 const ConstantPool* const cp = _cp; 1336 1337 while (attributes_count--) { 1338 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1339 const u2 attribute_name_index = cfs->get_u2_fast(); 1340 const u4 attribute_length = cfs->get_u4_fast(); 1341 check_property(valid_symbol_at(attribute_name_index), 1342 "Invalid field attribute index %u in class file %s", 1343 attribute_name_index, 1344 CHECK); 1345 1346 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1347 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1348 // ignore if non-static 1349 if (constantvalue_index != 0) { 1350 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1351 } 1352 check_property( 1353 attribute_length == 2, 1354 "Invalid ConstantValue field attribute length %u in class file %s", 1355 attribute_length, CHECK); 1356 1357 constantvalue_index = cfs->get_u2(CHECK); 1358 if (_need_verify) { 1359 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1360 } 1361 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1362 if (attribute_length != 0) { 1363 classfile_parse_error( 1364 "Invalid Synthetic field attribute length %u in class file %s", 1365 attribute_length, CHECK); 1366 } 1367 is_synthetic = true; 1368 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1369 if (attribute_length != 0) { 1370 classfile_parse_error( 1371 "Invalid Deprecated field attribute length %u in class file %s", 1372 attribute_length, CHECK); 1373 } 1374 } else if (_major_version >= JAVA_1_5_VERSION) { 1375 if (attribute_name == vmSymbols::tag_signature()) { 1376 if (generic_signature_index != 0) { 1377 classfile_parse_error( 1378 "Multiple Signature attributes for field in class file %s", CHECK); 1379 } 1380 if (attribute_length != 2) { 1381 classfile_parse_error( 1382 "Wrong size %u for field's Signature attribute in class file %s", 1383 attribute_length, CHECK); 1384 } 1385 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1386 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1387 if (runtime_visible_annotations != NULL) { 1388 classfile_parse_error( 1389 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1390 } 1391 runtime_visible_annotations_length = attribute_length; 1392 runtime_visible_annotations = cfs->current(); 1393 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1394 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1395 parse_annotations(cp, 1396 runtime_visible_annotations, 1397 runtime_visible_annotations_length, 1398 parsed_annotations, 1399 _loader_data, 1400 _can_access_vm_annotations, 1401 CHECK); 1402 cfs->skip_u1_fast(runtime_visible_annotations_length); 1403 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1404 if (runtime_invisible_annotations_exists) { 1405 classfile_parse_error( 1406 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1407 } 1408 runtime_invisible_annotations_exists = true; 1409 if (PreserveAllAnnotations) { 1410 runtime_invisible_annotations_length = attribute_length; 1411 runtime_invisible_annotations = cfs->current(); 1412 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1413 } 1414 cfs->skip_u1(attribute_length, CHECK); 1415 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1416 if (runtime_visible_type_annotations != NULL) { 1417 classfile_parse_error( 1418 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1419 } 1420 runtime_visible_type_annotations_length = attribute_length; 1421 runtime_visible_type_annotations = cfs->current(); 1422 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1423 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1424 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1425 if (runtime_invisible_type_annotations_exists) { 1426 classfile_parse_error( 1427 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1428 } else { 1429 runtime_invisible_type_annotations_exists = true; 1430 } 1431 if (PreserveAllAnnotations) { 1432 runtime_invisible_type_annotations_length = attribute_length; 1433 runtime_invisible_type_annotations = cfs->current(); 1434 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1435 } 1436 cfs->skip_u1(attribute_length, CHECK); 1437 } else { 1438 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1439 } 1440 } else { 1441 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1442 } 1443 } 1444 1445 *constantvalue_index_addr = constantvalue_index; 1446 *is_synthetic_addr = is_synthetic; 1447 *generic_signature_index_addr = generic_signature_index; 1448 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1449 runtime_visible_annotations_length, 1450 runtime_invisible_annotations, 1451 runtime_invisible_annotations_length, 1452 CHECK); 1453 parsed_annotations->set_field_annotations(a); 1454 a = assemble_annotations(runtime_visible_type_annotations, 1455 runtime_visible_type_annotations_length, 1456 runtime_invisible_type_annotations, 1457 runtime_invisible_type_annotations_length, 1458 CHECK); 1459 parsed_annotations->set_field_type_annotations(a); 1460 return; 1461 } 1462 1463 1464 // Field allocation types. Used for computing field offsets. 1465 1466 enum FieldAllocationType { 1467 STATIC_OOP, // Oops 1468 STATIC_BYTE, // Boolean, Byte, char 1469 STATIC_SHORT, // shorts 1470 STATIC_WORD, // ints 1471 STATIC_DOUBLE, // aligned long or double 1472 NONSTATIC_OOP, 1473 NONSTATIC_BYTE, 1474 NONSTATIC_SHORT, 1475 NONSTATIC_WORD, 1476 NONSTATIC_DOUBLE, 1477 MAX_FIELD_ALLOCATION_TYPE, 1478 BAD_ALLOCATION_TYPE = -1 1479 }; 1480 1481 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1482 BAD_ALLOCATION_TYPE, // 0 1483 BAD_ALLOCATION_TYPE, // 1 1484 BAD_ALLOCATION_TYPE, // 2 1485 BAD_ALLOCATION_TYPE, // 3 1486 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1487 NONSTATIC_SHORT, // T_CHAR = 5, 1488 NONSTATIC_WORD, // T_FLOAT = 6, 1489 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1490 NONSTATIC_BYTE, // T_BYTE = 8, 1491 NONSTATIC_SHORT, // T_SHORT = 9, 1492 NONSTATIC_WORD, // T_INT = 10, 1493 NONSTATIC_DOUBLE, // T_LONG = 11, 1494 NONSTATIC_OOP, // T_OBJECT = 12, 1495 NONSTATIC_OOP, // T_ARRAY = 13, 1496 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1497 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1498 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1499 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1500 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1501 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1502 BAD_ALLOCATION_TYPE, // 0 1503 BAD_ALLOCATION_TYPE, // 1 1504 BAD_ALLOCATION_TYPE, // 2 1505 BAD_ALLOCATION_TYPE, // 3 1506 STATIC_BYTE , // T_BOOLEAN = 4, 1507 STATIC_SHORT, // T_CHAR = 5, 1508 STATIC_WORD, // T_FLOAT = 6, 1509 STATIC_DOUBLE, // T_DOUBLE = 7, 1510 STATIC_BYTE, // T_BYTE = 8, 1511 STATIC_SHORT, // T_SHORT = 9, 1512 STATIC_WORD, // T_INT = 10, 1513 STATIC_DOUBLE, // T_LONG = 11, 1514 STATIC_OOP, // T_OBJECT = 12, 1515 STATIC_OOP, // T_ARRAY = 13, 1516 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1517 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1518 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1519 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1520 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1521 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1522 }; 1523 1524 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1525 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1526 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1527 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1528 return result; 1529 } 1530 1531 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1532 public: 1533 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1534 1535 FieldAllocationCount() { 1536 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1537 count[i] = 0; 1538 } 1539 } 1540 1541 FieldAllocationType update(bool is_static, BasicType type) { 1542 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1543 if (atype != BAD_ALLOCATION_TYPE) { 1544 // Make sure there is no overflow with injected fields. 1545 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1546 count[atype]++; 1547 } 1548 return atype; 1549 } 1550 }; 1551 1552 // Side-effects: populates the _fields, _fields_annotations, 1553 // _fields_type_annotations fields 1554 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1555 bool is_interface, 1556 FieldAllocationCount* const fac, 1557 ConstantPool* cp, 1558 const int cp_size, 1559 u2* const java_fields_count_ptr, 1560 TRAPS) { 1561 1562 assert(cfs != NULL, "invariant"); 1563 assert(fac != NULL, "invariant"); 1564 assert(cp != NULL, "invariant"); 1565 assert(java_fields_count_ptr != NULL, "invariant"); 1566 1567 assert(NULL == _fields, "invariant"); 1568 assert(NULL == _fields_annotations, "invariant"); 1569 assert(NULL == _fields_type_annotations, "invariant"); 1570 1571 cfs->guarantee_more(2, CHECK); // length 1572 const u2 length = cfs->get_u2_fast(); 1573 *java_fields_count_ptr = length; 1574 1575 int num_injected = 0; 1576 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1577 &num_injected); 1578 const int total_fields = length + num_injected; 1579 1580 // The field array starts with tuples of shorts 1581 // [access, name index, sig index, initial value index, byte offset]. 1582 // A generic signature slot only exists for field with generic 1583 // signature attribute. And the access flag is set with 1584 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1585 // signature slots are at the end of the field array and after all 1586 // other fields data. 1587 // 1588 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1589 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1590 // ... 1591 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1592 // [generic signature index] 1593 // [generic signature index] 1594 // ... 1595 // 1596 // Allocate a temporary resource array for field data. For each field, 1597 // a slot is reserved in the temporary array for the generic signature 1598 // index. After parsing all fields, the data are copied to a permanent 1599 // array and any unused slots will be discarded. 1600 ResourceMark rm(THREAD); 1601 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1602 u2, 1603 total_fields * (FieldInfo::field_slots + 1)); 1604 1605 // The generic signature slots start after all other fields' data. 1606 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1607 int num_generic_signature = 0; 1608 for (int n = 0; n < length; n++) { 1609 // access_flags, name_index, descriptor_index, attributes_count 1610 cfs->guarantee_more(8, CHECK); 1611 1612 AccessFlags access_flags; 1613 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1614 verify_legal_field_modifiers(flags, is_interface, CHECK); 1615 access_flags.set_flags(flags); 1616 1617 const u2 name_index = cfs->get_u2_fast(); 1618 check_property(valid_symbol_at(name_index), 1619 "Invalid constant pool index %u for field name in class file %s", 1620 name_index, CHECK); 1621 const Symbol* const name = cp->symbol_at(name_index); 1622 verify_legal_field_name(name, CHECK); 1623 1624 const u2 signature_index = cfs->get_u2_fast(); 1625 check_property(valid_symbol_at(signature_index), 1626 "Invalid constant pool index %u for field signature in class file %s", 1627 signature_index, CHECK); 1628 const Symbol* const sig = cp->symbol_at(signature_index); 1629 verify_legal_field_signature(name, sig, CHECK); 1630 1631 u2 constantvalue_index = 0; 1632 bool is_synthetic = false; 1633 u2 generic_signature_index = 0; 1634 const bool is_static = access_flags.is_static(); 1635 FieldAnnotationCollector parsed_annotations(_loader_data); 1636 1637 const u2 attributes_count = cfs->get_u2_fast(); 1638 if (attributes_count > 0) { 1639 parse_field_attributes(cfs, 1640 attributes_count, 1641 is_static, 1642 signature_index, 1643 &constantvalue_index, 1644 &is_synthetic, 1645 &generic_signature_index, 1646 &parsed_annotations, 1647 CHECK); 1648 1649 if (parsed_annotations.field_annotations() != NULL) { 1650 if (_fields_annotations == NULL) { 1651 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1652 _loader_data, length, NULL, 1653 CHECK); 1654 } 1655 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1656 parsed_annotations.set_field_annotations(NULL); 1657 } 1658 if (parsed_annotations.field_type_annotations() != NULL) { 1659 if (_fields_type_annotations == NULL) { 1660 _fields_type_annotations = 1661 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1662 length, 1663 NULL, 1664 CHECK); 1665 } 1666 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1667 parsed_annotations.set_field_type_annotations(NULL); 1668 } 1669 1670 if (is_synthetic) { 1671 access_flags.set_is_synthetic(); 1672 } 1673 if (generic_signature_index != 0) { 1674 access_flags.set_field_has_generic_signature(); 1675 fa[generic_signature_slot] = generic_signature_index; 1676 generic_signature_slot ++; 1677 num_generic_signature ++; 1678 } 1679 } 1680 1681 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1682 field->initialize(access_flags.as_short(), 1683 name_index, 1684 signature_index, 1685 constantvalue_index); 1686 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1687 1688 // Remember how many oops we encountered and compute allocation type 1689 const FieldAllocationType atype = fac->update(is_static, type); 1690 field->set_allocation_type(atype); 1691 1692 // After field is initialized with type, we can augment it with aux info 1693 if (parsed_annotations.has_any_annotations()) { 1694 parsed_annotations.apply_to(field); 1695 if (field->is_contended()) { 1696 _has_contended_fields = true; 1697 } 1698 } 1699 } 1700 1701 int index = length; 1702 if (num_injected != 0) { 1703 for (int n = 0; n < num_injected; n++) { 1704 // Check for duplicates 1705 if (injected[n].may_be_java) { 1706 const Symbol* const name = injected[n].name(); 1707 const Symbol* const signature = injected[n].signature(); 1708 bool duplicate = false; 1709 for (int i = 0; i < length; i++) { 1710 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1711 if (name == cp->symbol_at(f->name_index()) && 1712 signature == cp->symbol_at(f->signature_index())) { 1713 // Symbol is desclared in Java so skip this one 1714 duplicate = true; 1715 break; 1716 } 1717 } 1718 if (duplicate) { 1719 // These will be removed from the field array at the end 1720 continue; 1721 } 1722 } 1723 1724 // Injected field 1725 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1726 field->initialize(JVM_ACC_FIELD_INTERNAL, 1727 injected[n].name_index, 1728 injected[n].signature_index, 1729 0); 1730 1731 const BasicType type = Signature::basic_type(injected[n].signature()); 1732 1733 // Remember how many oops we encountered and compute allocation type 1734 const FieldAllocationType atype = fac->update(false, type); 1735 field->set_allocation_type(atype); 1736 index++; 1737 } 1738 } 1739 1740 assert(NULL == _fields, "invariant"); 1741 1742 _fields = 1743 MetadataFactory::new_array<u2>(_loader_data, 1744 index * FieldInfo::field_slots + num_generic_signature, 1745 CHECK); 1746 // Sometimes injected fields already exist in the Java source so 1747 // the fields array could be too long. In that case the 1748 // fields array is trimed. Also unused slots that were reserved 1749 // for generic signature indexes are discarded. 1750 { 1751 int i = 0; 1752 for (; i < index * FieldInfo::field_slots; i++) { 1753 _fields->at_put(i, fa[i]); 1754 } 1755 for (int j = total_fields * FieldInfo::field_slots; 1756 j < generic_signature_slot; j++) { 1757 _fields->at_put(i++, fa[j]); 1758 } 1759 assert(_fields->length() == i, ""); 1760 } 1761 1762 if (_need_verify && length > 1) { 1763 // Check duplicated fields 1764 ResourceMark rm(THREAD); 1765 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1766 THREAD, NameSigHash*, HASH_ROW_SIZE); 1767 initialize_hashtable(names_and_sigs); 1768 bool dup = false; 1769 const Symbol* name = NULL; 1770 const Symbol* sig = NULL; 1771 { 1772 debug_only(NoSafepointVerifier nsv;) 1773 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1774 name = fs.name(); 1775 sig = fs.signature(); 1776 // If no duplicates, add name/signature in hashtable names_and_sigs. 1777 if (!put_after_lookup(name, sig, names_and_sigs)) { 1778 dup = true; 1779 break; 1780 } 1781 } 1782 } 1783 if (dup) { 1784 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1785 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1786 } 1787 } 1788 } 1789 1790 1791 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1792 u4 code_length, 1793 u4 exception_table_length, 1794 TRAPS) { 1795 assert(cfs != NULL, "invariant"); 1796 1797 const unsafe_u2* const exception_table_start = cfs->current(); 1798 assert(exception_table_start != NULL, "null exception table"); 1799 1800 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1801 // end_pc, 1802 // handler_pc, 1803 // catch_type_index 1804 1805 // Will check legal target after parsing code array in verifier. 1806 if (_need_verify) { 1807 for (unsigned int i = 0; i < exception_table_length; i++) { 1808 const u2 start_pc = cfs->get_u2_fast(); 1809 const u2 end_pc = cfs->get_u2_fast(); 1810 const u2 handler_pc = cfs->get_u2_fast(); 1811 const u2 catch_type_index = cfs->get_u2_fast(); 1812 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1813 "Illegal exception table range in class file %s", 1814 CHECK_NULL); 1815 guarantee_property(handler_pc < code_length, 1816 "Illegal exception table handler in class file %s", 1817 CHECK_NULL); 1818 if (catch_type_index != 0) { 1819 guarantee_property(valid_klass_reference_at(catch_type_index), 1820 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1821 } 1822 } 1823 } else { 1824 cfs->skip_u2_fast(exception_table_length * 4); 1825 } 1826 return exception_table_start; 1827 } 1828 1829 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1830 u4 code_length, 1831 CompressedLineNumberWriteStream**const write_stream, 1832 TRAPS) { 1833 1834 const ClassFileStream* const cfs = _stream; 1835 unsigned int num_entries = cfs->get_u2(CHECK); 1836 1837 // Each entry is a u2 start_pc, and a u2 line_number 1838 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1839 1840 // Verify line number attribute and table length 1841 check_property( 1842 code_attribute_length == sizeof(u2) + length_in_bytes, 1843 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1844 1845 cfs->guarantee_more(length_in_bytes, CHECK); 1846 1847 if ((*write_stream) == NULL) { 1848 if (length_in_bytes > fixed_buffer_size) { 1849 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1850 } else { 1851 (*write_stream) = new CompressedLineNumberWriteStream( 1852 _linenumbertable_buffer, fixed_buffer_size); 1853 } 1854 } 1855 1856 while (num_entries-- > 0) { 1857 const u2 bci = cfs->get_u2_fast(); // start_pc 1858 const u2 line = cfs->get_u2_fast(); // line_number 1859 guarantee_property(bci < code_length, 1860 "Invalid pc in LineNumberTable in class file %s", CHECK); 1861 (*write_stream)->write_pair(bci, line); 1862 } 1863 } 1864 1865 1866 class LVT_Hash : public AllStatic { 1867 public: 1868 1869 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1870 /* 1871 * 3-tuple start_bci/length/slot has to be unique key, 1872 * so the following comparison seems to be redundant: 1873 * && elem->name_cp_index == entry->_elem->name_cp_index 1874 */ 1875 return (e0.start_bci == e1.start_bci && 1876 e0.length == e1.length && 1877 e0.name_cp_index == e1.name_cp_index && 1878 e0.slot == e1.slot); 1879 } 1880 1881 static unsigned int hash(LocalVariableTableElement const& e0) { 1882 unsigned int raw_hash = e0.start_bci; 1883 1884 raw_hash = e0.length + raw_hash * 37; 1885 raw_hash = e0.name_cp_index + raw_hash * 37; 1886 raw_hash = e0.slot + raw_hash * 37; 1887 1888 return raw_hash; 1889 } 1890 }; 1891 1892 1893 // Class file LocalVariableTable elements. 1894 class Classfile_LVT_Element { 1895 public: 1896 u2 start_bci; 1897 u2 length; 1898 u2 name_cp_index; 1899 u2 descriptor_cp_index; 1900 u2 slot; 1901 }; 1902 1903 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1904 LocalVariableTableElement* const lvt) { 1905 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1906 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1907 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1908 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1909 lvt->signature_cp_index = 0; 1910 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1911 } 1912 1913 // Function is used to parse both attributes: 1914 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1915 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1916 u4 code_length, 1917 u2 max_locals, 1918 u4 code_attribute_length, 1919 u2* const localvariable_table_length, 1920 bool isLVTT, 1921 TRAPS) { 1922 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1923 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1924 const unsigned int size = 1925 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1926 1927 const ConstantPool* const cp = _cp; 1928 1929 // Verify local variable table attribute has right length 1930 if (_need_verify) { 1931 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1932 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1933 } 1934 1935 const unsafe_u2* const localvariable_table_start = cfs->current(); 1936 assert(localvariable_table_start != NULL, "null local variable table"); 1937 if (!_need_verify) { 1938 cfs->skip_u2_fast(size); 1939 } else { 1940 cfs->guarantee_more(size * 2, CHECK_NULL); 1941 for(int i = 0; i < (*localvariable_table_length); i++) { 1942 const u2 start_pc = cfs->get_u2_fast(); 1943 const u2 length = cfs->get_u2_fast(); 1944 const u2 name_index = cfs->get_u2_fast(); 1945 const u2 descriptor_index = cfs->get_u2_fast(); 1946 const u2 index = cfs->get_u2_fast(); 1947 // Assign to a u4 to avoid overflow 1948 const u4 end_pc = (u4)start_pc + (u4)length; 1949 1950 if (start_pc >= code_length) { 1951 classfile_parse_error( 1952 "Invalid start_pc %u in %s in class file %s", 1953 start_pc, tbl_name, CHECK_NULL); 1954 } 1955 if (end_pc > code_length) { 1956 classfile_parse_error( 1957 "Invalid length %u in %s in class file %s", 1958 length, tbl_name, CHECK_NULL); 1959 } 1960 const int cp_size = cp->length(); 1961 guarantee_property(valid_symbol_at(name_index), 1962 "Name index %u in %s has bad constant type in class file %s", 1963 name_index, tbl_name, CHECK_NULL); 1964 guarantee_property(valid_symbol_at(descriptor_index), 1965 "Signature index %u in %s has bad constant type in class file %s", 1966 descriptor_index, tbl_name, CHECK_NULL); 1967 1968 const Symbol* const name = cp->symbol_at(name_index); 1969 const Symbol* const sig = cp->symbol_at(descriptor_index); 1970 verify_legal_field_name(name, CHECK_NULL); 1971 u2 extra_slot = 0; 1972 if (!isLVTT) { 1973 verify_legal_field_signature(name, sig, CHECK_NULL); 1974 1975 // 4894874: check special cases for double and long local variables 1976 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1977 sig == vmSymbols::type_signature(T_LONG)) { 1978 extra_slot = 1; 1979 } 1980 } 1981 guarantee_property((index + extra_slot) < max_locals, 1982 "Invalid index %u in %s in class file %s", 1983 index, tbl_name, CHECK_NULL); 1984 } 1985 } 1986 return localvariable_table_start; 1987 } 1988 1989 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1990 u4 code_attribute_length, 1991 bool need_verify, 1992 TRAPS) { 1993 assert(cfs != NULL, "invariant"); 1994 1995 if (0 == code_attribute_length) { 1996 return NULL; 1997 } 1998 1999 const u1* const stackmap_table_start = cfs->current(); 2000 assert(stackmap_table_start != NULL, "null stackmap table"); 2001 2002 // check code_attribute_length first 2003 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2004 2005 if (!need_verify && !DumpSharedSpaces) { 2006 return NULL; 2007 } 2008 return stackmap_table_start; 2009 } 2010 2011 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2012 u2* const checked_exceptions_length, 2013 u4 method_attribute_length, 2014 TRAPS) { 2015 assert(cfs != NULL, "invariant"); 2016 assert(checked_exceptions_length != NULL, "invariant"); 2017 2018 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2019 *checked_exceptions_length = cfs->get_u2_fast(); 2020 const unsigned int size = 2021 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2022 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2023 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2024 if (!_need_verify) { 2025 cfs->skip_u2_fast(size); 2026 } else { 2027 // Verify each value in the checked exception table 2028 u2 checked_exception; 2029 const u2 len = *checked_exceptions_length; 2030 cfs->guarantee_more(2 * len, CHECK_NULL); 2031 for (int i = 0; i < len; i++) { 2032 checked_exception = cfs->get_u2_fast(); 2033 check_property( 2034 valid_klass_reference_at(checked_exception), 2035 "Exception name has bad type at constant pool %u in class file %s", 2036 checked_exception, CHECK_NULL); 2037 } 2038 } 2039 // check exceptions attribute length 2040 if (_need_verify) { 2041 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2042 sizeof(u2) * size), 2043 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2044 } 2045 return checked_exceptions_start; 2046 } 2047 2048 void ClassFileParser::throwIllegalSignature(const char* type, 2049 const Symbol* name, 2050 const Symbol* sig, 2051 TRAPS) const { 2052 assert(name != NULL, "invariant"); 2053 assert(sig != NULL, "invariant"); 2054 2055 ResourceMark rm(THREAD); 2056 Exceptions::fthrow(THREAD_AND_LOCATION, 2057 vmSymbols::java_lang_ClassFormatError(), 2058 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2059 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2060 } 2061 2062 AnnotationCollector::ID 2063 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2064 const Symbol* name, 2065 const bool can_access_vm_annotations) { 2066 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2067 // Privileged code can use all annotations. Other code silently drops some. 2068 const bool privileged = loader_data->is_boot_class_loader_data() || 2069 loader_data->is_platform_class_loader_data() || 2070 can_access_vm_annotations; 2071 switch (sid) { 2072 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2073 if (_location != _in_method) break; // only allow for methods 2074 if (!privileged) break; // only allow in privileged code 2075 return _method_CallerSensitive; 2076 } 2077 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2078 if (_location != _in_method) break; // only allow for methods 2079 if (!privileged) break; // only allow in privileged code 2080 return _method_ForceInline; 2081 } 2082 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2083 if (_location != _in_method) break; // only allow for methods 2084 if (!privileged) break; // only allow in privileged code 2085 return _method_DontInline; 2086 } 2087 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2088 if (_location != _in_method) break; // only allow for methods 2089 if (!privileged) break; // only allow in privileged code 2090 return _method_InjectedProfile; 2091 } 2092 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2093 if (_location != _in_method) break; // only allow for methods 2094 if (!privileged) break; // only allow in privileged code 2095 return _method_LambdaForm_Compiled; 2096 } 2097 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 2098 if (_location != _in_method) break; // only allow for methods 2099 if (!privileged) break; // only allow in privileged code 2100 return _method_Hidden; 2101 } 2102 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2103 if (_location != _in_method) break; // only allow for methods 2104 if (!privileged) break; // only allow in privileged code 2105 return _method_HotSpotIntrinsicCandidate; 2106 } 2107 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2108 if (_location != _in_field) break; // only allow for fields 2109 if (!privileged) break; // only allow in privileged code 2110 return _field_Stable; 2111 } 2112 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2113 if (_location != _in_field && _location != _in_class) { 2114 break; // only allow for fields and classes 2115 } 2116 if (!EnableContended || (RestrictContended && !privileged)) { 2117 break; // honor privileges 2118 } 2119 return _jdk_internal_vm_annotation_Contended; 2120 } 2121 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2122 if (_location != _in_method) break; // only allow for methods 2123 if (RestrictReservedStack && !privileged) break; // honor privileges 2124 return _jdk_internal_vm_annotation_ReservedStackAccess; 2125 } 2126 default: { 2127 break; 2128 } 2129 } 2130 return AnnotationCollector::_unknown; 2131 } 2132 2133 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2134 if (is_contended()) 2135 f->set_contended_group(contended_group()); 2136 if (is_stable()) 2137 f->set_stable(true); 2138 } 2139 2140 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2141 // If there's an error deallocate metadata for field annotations 2142 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2143 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2144 } 2145 2146 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2147 if (has_annotation(_method_CallerSensitive)) 2148 m->set_caller_sensitive(true); 2149 if (has_annotation(_method_ForceInline)) 2150 m->set_force_inline(true); 2151 if (has_annotation(_method_DontInline)) 2152 m->set_dont_inline(true); 2153 if (has_annotation(_method_InjectedProfile)) 2154 m->set_has_injected_profile(true); 2155 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2156 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2157 if (has_annotation(_method_Hidden)) 2158 m->set_hidden(true); 2159 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2160 m->set_intrinsic_candidate(true); 2161 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2162 m->set_has_reserved_stack_access(true); 2163 } 2164 2165 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2166 assert(ik != NULL, "invariant"); 2167 ik->set_is_contended(is_contended()); 2168 } 2169 2170 #define MAX_ARGS_SIZE 255 2171 #define MAX_CODE_SIZE 65535 2172 #define INITIAL_MAX_LVT_NUMBER 256 2173 2174 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2175 * 2176 * Rules for LVT's and LVTT's are: 2177 * - There can be any number of LVT's and LVTT's. 2178 * - If there are n LVT's, it is the same as if there was just 2179 * one LVT containing all the entries from the n LVT's. 2180 * - There may be no more than one LVT entry per local variable. 2181 * Two LVT entries are 'equal' if these fields are the same: 2182 * start_pc, length, name, slot 2183 * - There may be no more than one LVTT entry per each LVT entry. 2184 * Each LVTT entry has to match some LVT entry. 2185 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2186 */ 2187 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2188 int lvt_cnt, 2189 u2* const localvariable_table_length, 2190 const unsafe_u2** const localvariable_table_start, 2191 int lvtt_cnt, 2192 u2* const localvariable_type_table_length, 2193 const unsafe_u2** const localvariable_type_table_start, 2194 TRAPS) { 2195 2196 ResourceMark rm(THREAD); 2197 2198 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2199 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2200 2201 LVT_HashTable* const table = new LVT_HashTable(); 2202 2203 // To fill LocalVariableTable in 2204 const Classfile_LVT_Element* cf_lvt; 2205 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2206 2207 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2208 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2209 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2210 copy_lvt_element(&cf_lvt[idx], lvt); 2211 // If no duplicates, add LVT elem in hashtable. 2212 if (table->put(*lvt, lvt) == false 2213 && _need_verify 2214 && _major_version >= JAVA_1_5_VERSION) { 2215 classfile_parse_error("Duplicated LocalVariableTable attribute " 2216 "entry for '%s' in class file %s", 2217 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2218 CHECK); 2219 } 2220 } 2221 } 2222 2223 // To merge LocalVariableTable and LocalVariableTypeTable 2224 const Classfile_LVT_Element* cf_lvtt; 2225 LocalVariableTableElement lvtt_elem; 2226 2227 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2228 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2229 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2230 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2231 LocalVariableTableElement** entry = table->get(lvtt_elem); 2232 if (entry == NULL) { 2233 if (_need_verify) { 2234 classfile_parse_error("LVTT entry for '%s' in class file %s " 2235 "does not match any LVT entry", 2236 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2237 CHECK); 2238 } 2239 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2240 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2241 "entry for '%s' in class file %s", 2242 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2243 CHECK); 2244 } else { 2245 // to add generic signatures into LocalVariableTable 2246 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2247 } 2248 } 2249 } 2250 } 2251 2252 2253 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2254 const u1* runtime_visible_annotations, 2255 int runtime_visible_annotations_length, 2256 const u1* runtime_invisible_annotations, 2257 int runtime_invisible_annotations_length, 2258 const u1* runtime_visible_parameter_annotations, 2259 int runtime_visible_parameter_annotations_length, 2260 const u1* runtime_invisible_parameter_annotations, 2261 int runtime_invisible_parameter_annotations_length, 2262 const u1* runtime_visible_type_annotations, 2263 int runtime_visible_type_annotations_length, 2264 const u1* runtime_invisible_type_annotations, 2265 int runtime_invisible_type_annotations_length, 2266 const u1* annotation_default, 2267 int annotation_default_length, 2268 TRAPS) { 2269 2270 AnnotationArray* a; 2271 2272 if (runtime_visible_annotations_length + 2273 runtime_invisible_annotations_length > 0) { 2274 a = assemble_annotations(runtime_visible_annotations, 2275 runtime_visible_annotations_length, 2276 runtime_invisible_annotations, 2277 runtime_invisible_annotations_length, 2278 CHECK); 2279 cm->set_method_annotations(a); 2280 } 2281 2282 if (runtime_visible_parameter_annotations_length + 2283 runtime_invisible_parameter_annotations_length > 0) { 2284 a = assemble_annotations(runtime_visible_parameter_annotations, 2285 runtime_visible_parameter_annotations_length, 2286 runtime_invisible_parameter_annotations, 2287 runtime_invisible_parameter_annotations_length, 2288 CHECK); 2289 cm->set_parameter_annotations(a); 2290 } 2291 2292 if (annotation_default_length > 0) { 2293 a = assemble_annotations(annotation_default, 2294 annotation_default_length, 2295 NULL, 2296 0, 2297 CHECK); 2298 cm->set_default_annotations(a); 2299 } 2300 2301 if (runtime_visible_type_annotations_length + 2302 runtime_invisible_type_annotations_length > 0) { 2303 a = assemble_annotations(runtime_visible_type_annotations, 2304 runtime_visible_type_annotations_length, 2305 runtime_invisible_type_annotations, 2306 runtime_invisible_type_annotations_length, 2307 CHECK); 2308 cm->set_type_annotations(a); 2309 } 2310 } 2311 2312 2313 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2314 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2315 // Method* to save footprint, so we only know the size of the resulting Method* when the 2316 // entire method attribute is parsed. 2317 // 2318 // The promoted_flags parameter is used to pass relevant access_flags 2319 // from the method back up to the containing klass. These flag values 2320 // are added to klass's access_flags. 2321 2322 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2323 bool is_interface, 2324 const ConstantPool* cp, 2325 AccessFlags* const promoted_flags, 2326 TRAPS) { 2327 assert(cfs != NULL, "invariant"); 2328 assert(cp != NULL, "invariant"); 2329 assert(promoted_flags != NULL, "invariant"); 2330 2331 ResourceMark rm(THREAD); 2332 // Parse fixed parts: 2333 // access_flags, name_index, descriptor_index, attributes_count 2334 cfs->guarantee_more(8, CHECK_NULL); 2335 2336 int flags = cfs->get_u2_fast(); 2337 const u2 name_index = cfs->get_u2_fast(); 2338 const int cp_size = cp->length(); 2339 check_property( 2340 valid_symbol_at(name_index), 2341 "Illegal constant pool index %u for method name in class file %s", 2342 name_index, CHECK_NULL); 2343 const Symbol* const name = cp->symbol_at(name_index); 2344 verify_legal_method_name(name, CHECK_NULL); 2345 2346 const u2 signature_index = cfs->get_u2_fast(); 2347 guarantee_property( 2348 valid_symbol_at(signature_index), 2349 "Illegal constant pool index %u for method signature in class file %s", 2350 signature_index, CHECK_NULL); 2351 const Symbol* const signature = cp->symbol_at(signature_index); 2352 2353 if (name == vmSymbols::class_initializer_name()) { 2354 // We ignore the other access flags for a valid class initializer. 2355 // (JVM Spec 2nd ed., chapter 4.6) 2356 if (_major_version < 51) { // backward compatibility 2357 flags = JVM_ACC_STATIC; 2358 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2359 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2360 } else { 2361 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2362 } 2363 } else { 2364 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2365 } 2366 2367 if (name == vmSymbols::object_initializer_name() && is_interface) { 2368 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2369 } 2370 2371 int args_size = -1; // only used when _need_verify is true 2372 if (_need_verify) { 2373 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2374 verify_legal_method_signature(name, signature, CHECK_NULL); 2375 if (args_size > MAX_ARGS_SIZE) { 2376 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2377 } 2378 } 2379 2380 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2381 2382 // Default values for code and exceptions attribute elements 2383 u2 max_stack = 0; 2384 u2 max_locals = 0; 2385 u4 code_length = 0; 2386 const u1* code_start = 0; 2387 u2 exception_table_length = 0; 2388 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2389 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2390 u2 checked_exceptions_length = 0; 2391 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2392 CompressedLineNumberWriteStream* linenumber_table = NULL; 2393 int linenumber_table_length = 0; 2394 int total_lvt_length = 0; 2395 u2 lvt_cnt = 0; 2396 u2 lvtt_cnt = 0; 2397 bool lvt_allocated = false; 2398 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2399 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2400 u2* localvariable_table_length = NULL; 2401 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2402 u2* localvariable_type_table_length = NULL; 2403 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2404 int method_parameters_length = -1; 2405 const u1* method_parameters_data = NULL; 2406 bool method_parameters_seen = false; 2407 bool parsed_code_attribute = false; 2408 bool parsed_checked_exceptions_attribute = false; 2409 bool parsed_stackmap_attribute = false; 2410 // stackmap attribute - JDK1.5 2411 const u1* stackmap_data = NULL; 2412 int stackmap_data_length = 0; 2413 u2 generic_signature_index = 0; 2414 MethodAnnotationCollector parsed_annotations; 2415 const u1* runtime_visible_annotations = NULL; 2416 int runtime_visible_annotations_length = 0; 2417 const u1* runtime_invisible_annotations = NULL; 2418 int runtime_invisible_annotations_length = 0; 2419 const u1* runtime_visible_parameter_annotations = NULL; 2420 int runtime_visible_parameter_annotations_length = 0; 2421 const u1* runtime_invisible_parameter_annotations = NULL; 2422 int runtime_invisible_parameter_annotations_length = 0; 2423 const u1* runtime_visible_type_annotations = NULL; 2424 int runtime_visible_type_annotations_length = 0; 2425 const u1* runtime_invisible_type_annotations = NULL; 2426 int runtime_invisible_type_annotations_length = 0; 2427 bool runtime_invisible_annotations_exists = false; 2428 bool runtime_invisible_type_annotations_exists = false; 2429 bool runtime_invisible_parameter_annotations_exists = false; 2430 const u1* annotation_default = NULL; 2431 int annotation_default_length = 0; 2432 2433 // Parse code and exceptions attribute 2434 u2 method_attributes_count = cfs->get_u2_fast(); 2435 while (method_attributes_count--) { 2436 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2437 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2438 const u4 method_attribute_length = cfs->get_u4_fast(); 2439 check_property( 2440 valid_symbol_at(method_attribute_name_index), 2441 "Invalid method attribute name index %u in class file %s", 2442 method_attribute_name_index, CHECK_NULL); 2443 2444 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2445 if (method_attribute_name == vmSymbols::tag_code()) { 2446 // Parse Code attribute 2447 if (_need_verify) { 2448 guarantee_property( 2449 !access_flags.is_native() && !access_flags.is_abstract(), 2450 "Code attribute in native or abstract methods in class file %s", 2451 CHECK_NULL); 2452 } 2453 if (parsed_code_attribute) { 2454 classfile_parse_error("Multiple Code attributes in class file %s", 2455 CHECK_NULL); 2456 } 2457 parsed_code_attribute = true; 2458 2459 // Stack size, locals size, and code size 2460 cfs->guarantee_more(8, CHECK_NULL); 2461 max_stack = cfs->get_u2_fast(); 2462 max_locals = cfs->get_u2_fast(); 2463 code_length = cfs->get_u4_fast(); 2464 if (_need_verify) { 2465 guarantee_property(args_size <= max_locals, 2466 "Arguments can't fit into locals in class file %s", 2467 CHECK_NULL); 2468 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2469 "Invalid method Code length %u in class file %s", 2470 code_length, CHECK_NULL); 2471 } 2472 // Code pointer 2473 code_start = cfs->current(); 2474 assert(code_start != NULL, "null code start"); 2475 cfs->guarantee_more(code_length, CHECK_NULL); 2476 cfs->skip_u1_fast(code_length); 2477 2478 // Exception handler table 2479 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2480 exception_table_length = cfs->get_u2_fast(); 2481 if (exception_table_length > 0) { 2482 exception_table_start = parse_exception_table(cfs, 2483 code_length, 2484 exception_table_length, 2485 CHECK_NULL); 2486 } 2487 2488 // Parse additional attributes in code attribute 2489 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2490 u2 code_attributes_count = cfs->get_u2_fast(); 2491 2492 unsigned int calculated_attribute_length = 0; 2493 2494 calculated_attribute_length = 2495 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2496 calculated_attribute_length += 2497 code_length + 2498 sizeof(exception_table_length) + 2499 sizeof(code_attributes_count) + 2500 exception_table_length * 2501 ( sizeof(u2) + // start_pc 2502 sizeof(u2) + // end_pc 2503 sizeof(u2) + // handler_pc 2504 sizeof(u2) ); // catch_type_index 2505 2506 while (code_attributes_count--) { 2507 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2508 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2509 const u4 code_attribute_length = cfs->get_u4_fast(); 2510 calculated_attribute_length += code_attribute_length + 2511 sizeof(code_attribute_name_index) + 2512 sizeof(code_attribute_length); 2513 check_property(valid_symbol_at(code_attribute_name_index), 2514 "Invalid code attribute name index %u in class file %s", 2515 code_attribute_name_index, 2516 CHECK_NULL); 2517 if (LoadLineNumberTables && 2518 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2519 // Parse and compress line number table 2520 parse_linenumber_table(code_attribute_length, 2521 code_length, 2522 &linenumber_table, 2523 CHECK_NULL); 2524 2525 } else if (LoadLocalVariableTables && 2526 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2527 // Parse local variable table 2528 if (!lvt_allocated) { 2529 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2530 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2531 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2532 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2533 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2534 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2535 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2536 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2537 lvt_allocated = true; 2538 } 2539 if (lvt_cnt == max_lvt_cnt) { 2540 max_lvt_cnt <<= 1; 2541 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2542 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2543 } 2544 localvariable_table_start[lvt_cnt] = 2545 parse_localvariable_table(cfs, 2546 code_length, 2547 max_locals, 2548 code_attribute_length, 2549 &localvariable_table_length[lvt_cnt], 2550 false, // is not LVTT 2551 CHECK_NULL); 2552 total_lvt_length += localvariable_table_length[lvt_cnt]; 2553 lvt_cnt++; 2554 } else if (LoadLocalVariableTypeTables && 2555 _major_version >= JAVA_1_5_VERSION && 2556 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2557 if (!lvt_allocated) { 2558 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2559 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2560 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2561 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2562 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2563 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2564 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2565 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2566 lvt_allocated = true; 2567 } 2568 // Parse local variable type table 2569 if (lvtt_cnt == max_lvtt_cnt) { 2570 max_lvtt_cnt <<= 1; 2571 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2572 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2573 } 2574 localvariable_type_table_start[lvtt_cnt] = 2575 parse_localvariable_table(cfs, 2576 code_length, 2577 max_locals, 2578 code_attribute_length, 2579 &localvariable_type_table_length[lvtt_cnt], 2580 true, // is LVTT 2581 CHECK_NULL); 2582 lvtt_cnt++; 2583 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2584 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2585 // Stack map is only needed by the new verifier in JDK1.5. 2586 if (parsed_stackmap_attribute) { 2587 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2588 } 2589 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2590 stackmap_data_length = code_attribute_length; 2591 parsed_stackmap_attribute = true; 2592 } else { 2593 // Skip unknown attributes 2594 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2595 } 2596 } 2597 // check method attribute length 2598 if (_need_verify) { 2599 guarantee_property(method_attribute_length == calculated_attribute_length, 2600 "Code segment has wrong length in class file %s", 2601 CHECK_NULL); 2602 } 2603 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2604 // Parse Exceptions attribute 2605 if (parsed_checked_exceptions_attribute) { 2606 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2607 CHECK_NULL); 2608 } 2609 parsed_checked_exceptions_attribute = true; 2610 checked_exceptions_start = 2611 parse_checked_exceptions(cfs, 2612 &checked_exceptions_length, 2613 method_attribute_length, 2614 CHECK_NULL); 2615 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2616 // reject multiple method parameters 2617 if (method_parameters_seen) { 2618 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2619 CHECK_NULL); 2620 } 2621 method_parameters_seen = true; 2622 method_parameters_length = cfs->get_u1_fast(); 2623 const u2 real_length = (method_parameters_length * 4u) + 1u; 2624 if (method_attribute_length != real_length) { 2625 classfile_parse_error( 2626 "Invalid MethodParameters method attribute length %u in class file", 2627 method_attribute_length, CHECK_NULL); 2628 } 2629 method_parameters_data = cfs->current(); 2630 cfs->skip_u2_fast(method_parameters_length); 2631 cfs->skip_u2_fast(method_parameters_length); 2632 // ignore this attribute if it cannot be reflected 2633 if (!SystemDictionary::Parameter_klass_loaded()) 2634 method_parameters_length = -1; 2635 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2636 if (method_attribute_length != 0) { 2637 classfile_parse_error( 2638 "Invalid Synthetic method attribute length %u in class file %s", 2639 method_attribute_length, CHECK_NULL); 2640 } 2641 // Should we check that there hasn't already been a synthetic attribute? 2642 access_flags.set_is_synthetic(); 2643 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2644 if (method_attribute_length != 0) { 2645 classfile_parse_error( 2646 "Invalid Deprecated method attribute length %u in class file %s", 2647 method_attribute_length, CHECK_NULL); 2648 } 2649 } else if (_major_version >= JAVA_1_5_VERSION) { 2650 if (method_attribute_name == vmSymbols::tag_signature()) { 2651 if (generic_signature_index != 0) { 2652 classfile_parse_error( 2653 "Multiple Signature attributes for method in class file %s", 2654 CHECK_NULL); 2655 } 2656 if (method_attribute_length != 2) { 2657 classfile_parse_error( 2658 "Invalid Signature attribute length %u in class file %s", 2659 method_attribute_length, CHECK_NULL); 2660 } 2661 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2662 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2663 if (runtime_visible_annotations != NULL) { 2664 classfile_parse_error( 2665 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2666 CHECK_NULL); 2667 } 2668 runtime_visible_annotations_length = method_attribute_length; 2669 runtime_visible_annotations = cfs->current(); 2670 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2671 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2672 parse_annotations(cp, 2673 runtime_visible_annotations, 2674 runtime_visible_annotations_length, 2675 &parsed_annotations, 2676 _loader_data, 2677 _can_access_vm_annotations, 2678 CHECK_NULL); 2679 cfs->skip_u1_fast(runtime_visible_annotations_length); 2680 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2681 if (runtime_invisible_annotations_exists) { 2682 classfile_parse_error( 2683 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2684 CHECK_NULL); 2685 } 2686 runtime_invisible_annotations_exists = true; 2687 if (PreserveAllAnnotations) { 2688 runtime_invisible_annotations_length = method_attribute_length; 2689 runtime_invisible_annotations = cfs->current(); 2690 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2691 } 2692 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2693 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2694 if (runtime_visible_parameter_annotations != NULL) { 2695 classfile_parse_error( 2696 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2697 CHECK_NULL); 2698 } 2699 runtime_visible_parameter_annotations_length = method_attribute_length; 2700 runtime_visible_parameter_annotations = cfs->current(); 2701 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2702 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2703 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2704 if (runtime_invisible_parameter_annotations_exists) { 2705 classfile_parse_error( 2706 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2707 CHECK_NULL); 2708 } 2709 runtime_invisible_parameter_annotations_exists = true; 2710 if (PreserveAllAnnotations) { 2711 runtime_invisible_parameter_annotations_length = method_attribute_length; 2712 runtime_invisible_parameter_annotations = cfs->current(); 2713 assert(runtime_invisible_parameter_annotations != NULL, 2714 "null invisible parameter annotations"); 2715 } 2716 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2717 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2718 if (annotation_default != NULL) { 2719 classfile_parse_error( 2720 "Multiple AnnotationDefault attributes for method in class file %s", 2721 CHECK_NULL); 2722 } 2723 annotation_default_length = method_attribute_length; 2724 annotation_default = cfs->current(); 2725 assert(annotation_default != NULL, "null annotation default"); 2726 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2727 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2728 if (runtime_visible_type_annotations != NULL) { 2729 classfile_parse_error( 2730 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2731 CHECK_NULL); 2732 } 2733 runtime_visible_type_annotations_length = method_attribute_length; 2734 runtime_visible_type_annotations = cfs->current(); 2735 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2736 // No need for the VM to parse Type annotations 2737 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2738 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2739 if (runtime_invisible_type_annotations_exists) { 2740 classfile_parse_error( 2741 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2742 CHECK_NULL); 2743 } else { 2744 runtime_invisible_type_annotations_exists = true; 2745 } 2746 if (PreserveAllAnnotations) { 2747 runtime_invisible_type_annotations_length = method_attribute_length; 2748 runtime_invisible_type_annotations = cfs->current(); 2749 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2750 } 2751 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2752 } else { 2753 // Skip unknown attributes 2754 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2755 } 2756 } else { 2757 // Skip unknown attributes 2758 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2759 } 2760 } 2761 2762 if (linenumber_table != NULL) { 2763 linenumber_table->write_terminator(); 2764 linenumber_table_length = linenumber_table->position(); 2765 } 2766 2767 // Make sure there's at least one Code attribute in non-native/non-abstract method 2768 if (_need_verify) { 2769 guarantee_property(access_flags.is_native() || 2770 access_flags.is_abstract() || 2771 parsed_code_attribute, 2772 "Absent Code attribute in method that is not native or abstract in class file %s", 2773 CHECK_NULL); 2774 } 2775 2776 // All sizing information for a Method* is finally available, now create it 2777 InlineTableSizes sizes( 2778 total_lvt_length, 2779 linenumber_table_length, 2780 exception_table_length, 2781 checked_exceptions_length, 2782 method_parameters_length, 2783 generic_signature_index, 2784 runtime_visible_annotations_length + 2785 runtime_invisible_annotations_length, 2786 runtime_visible_parameter_annotations_length + 2787 runtime_invisible_parameter_annotations_length, 2788 runtime_visible_type_annotations_length + 2789 runtime_invisible_type_annotations_length, 2790 annotation_default_length, 2791 0); 2792 2793 Method* const m = Method::allocate(_loader_data, 2794 code_length, 2795 access_flags, 2796 &sizes, 2797 ConstMethod::NORMAL, 2798 CHECK_NULL); 2799 2800 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2801 2802 // Fill in information from fixed part (access_flags already set) 2803 m->set_constants(_cp); 2804 m->set_name_index(name_index); 2805 m->set_signature_index(signature_index); 2806 m->compute_from_signature(cp->symbol_at(signature_index)); 2807 assert(args_size < 0 || args_size == m->size_of_parameters(), ""); 2808 2809 // Fill in code attribute information 2810 m->set_max_stack(max_stack); 2811 m->set_max_locals(max_locals); 2812 if (stackmap_data != NULL) { 2813 m->constMethod()->copy_stackmap_data(_loader_data, 2814 (u1*)stackmap_data, 2815 stackmap_data_length, 2816 CHECK_NULL); 2817 } 2818 2819 // Copy byte codes 2820 m->set_code((u1*)code_start); 2821 2822 // Copy line number table 2823 if (linenumber_table != NULL) { 2824 memcpy(m->compressed_linenumber_table(), 2825 linenumber_table->buffer(), 2826 linenumber_table_length); 2827 } 2828 2829 // Copy exception table 2830 if (exception_table_length > 0) { 2831 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2832 m->exception_table_start(), 2833 exception_table_length * sizeof(ExceptionTableElement), 2834 sizeof(u2)); 2835 } 2836 2837 // Copy method parameters 2838 if (method_parameters_length > 0) { 2839 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2840 for (int i = 0; i < method_parameters_length; i++) { 2841 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2842 method_parameters_data += 2; 2843 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2844 method_parameters_data += 2; 2845 } 2846 } 2847 2848 // Copy checked exceptions 2849 if (checked_exceptions_length > 0) { 2850 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2851 m->checked_exceptions_start(), 2852 checked_exceptions_length * sizeof(CheckedExceptionElement), 2853 sizeof(u2)); 2854 } 2855 2856 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2857 if (total_lvt_length > 0) { 2858 promoted_flags->set_has_localvariable_table(); 2859 copy_localvariable_table(m->constMethod(), 2860 lvt_cnt, 2861 localvariable_table_length, 2862 localvariable_table_start, 2863 lvtt_cnt, 2864 localvariable_type_table_length, 2865 localvariable_type_table_start, 2866 CHECK_NULL); 2867 } 2868 2869 if (parsed_annotations.has_any_annotations()) 2870 parsed_annotations.apply_to(methodHandle(THREAD, m)); 2871 2872 if (is_hidden()) { // Mark methods in hidden classes as 'hidden'. 2873 m->set_hidden(true); 2874 } 2875 2876 // Copy annotations 2877 copy_method_annotations(m->constMethod(), 2878 runtime_visible_annotations, 2879 runtime_visible_annotations_length, 2880 runtime_invisible_annotations, 2881 runtime_invisible_annotations_length, 2882 runtime_visible_parameter_annotations, 2883 runtime_visible_parameter_annotations_length, 2884 runtime_invisible_parameter_annotations, 2885 runtime_invisible_parameter_annotations_length, 2886 runtime_visible_type_annotations, 2887 runtime_visible_type_annotations_length, 2888 runtime_invisible_type_annotations, 2889 runtime_invisible_type_annotations_length, 2890 annotation_default, 2891 annotation_default_length, 2892 CHECK_NULL); 2893 2894 if (name == vmSymbols::finalize_method_name() && 2895 signature == vmSymbols::void_method_signature()) { 2896 if (m->is_empty_method()) { 2897 _has_empty_finalizer = true; 2898 } else { 2899 _has_finalizer = true; 2900 } 2901 } 2902 if (name == vmSymbols::object_initializer_name() && 2903 signature == vmSymbols::void_method_signature() && 2904 m->is_vanilla_constructor()) { 2905 _has_vanilla_constructor = true; 2906 } 2907 2908 NOT_PRODUCT(m->verify()); 2909 return m; 2910 } 2911 2912 2913 // The promoted_flags parameter is used to pass relevant access_flags 2914 // from the methods back up to the containing klass. These flag values 2915 // are added to klass's access_flags. 2916 // Side-effects: populates the _methods field in the parser 2917 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2918 bool is_interface, 2919 AccessFlags* promoted_flags, 2920 bool* has_final_method, 2921 bool* declares_nonstatic_concrete_methods, 2922 TRAPS) { 2923 assert(cfs != NULL, "invariant"); 2924 assert(promoted_flags != NULL, "invariant"); 2925 assert(has_final_method != NULL, "invariant"); 2926 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 2927 2928 assert(NULL == _methods, "invariant"); 2929 2930 cfs->guarantee_more(2, CHECK); // length 2931 const u2 length = cfs->get_u2_fast(); 2932 if (length == 0) { 2933 _methods = Universe::the_empty_method_array(); 2934 } else { 2935 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2936 length, 2937 NULL, 2938 CHECK); 2939 2940 for (int index = 0; index < length; index++) { 2941 Method* method = parse_method(cfs, 2942 is_interface, 2943 _cp, 2944 promoted_flags, 2945 CHECK); 2946 2947 if (method->is_final()) { 2948 *has_final_method = true; 2949 } 2950 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2951 // used for interface initialization, and default method inheritance analysis 2952 if (is_interface && !(*declares_nonstatic_concrete_methods) 2953 && !method->is_abstract() && !method->is_static()) { 2954 *declares_nonstatic_concrete_methods = true; 2955 } 2956 _methods->at_put(index, method); 2957 } 2958 2959 if (_need_verify && length > 1) { 2960 // Check duplicated methods 2961 ResourceMark rm(THREAD); 2962 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2963 THREAD, NameSigHash*, HASH_ROW_SIZE); 2964 initialize_hashtable(names_and_sigs); 2965 bool dup = false; 2966 const Symbol* name = NULL; 2967 const Symbol* sig = NULL; 2968 { 2969 debug_only(NoSafepointVerifier nsv;) 2970 for (int i = 0; i < length; i++) { 2971 const Method* const m = _methods->at(i); 2972 name = m->name(); 2973 sig = m->signature(); 2974 // If no duplicates, add name/signature in hashtable names_and_sigs. 2975 if (!put_after_lookup(name, sig, names_and_sigs)) { 2976 dup = true; 2977 break; 2978 } 2979 } 2980 } 2981 if (dup) { 2982 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2983 name->as_C_string(), sig->as_klass_external_name(), CHECK); 2984 } 2985 } 2986 } 2987 } 2988 2989 static const intArray* sort_methods(Array<Method*>* methods) { 2990 const int length = methods->length(); 2991 // If JVMTI original method ordering or sharing is enabled we have to 2992 // remember the original class file ordering. 2993 // We temporarily use the vtable_index field in the Method* to store the 2994 // class file index, so we can read in after calling qsort. 2995 // Put the method ordering in the shared archive. 2996 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 2997 for (int index = 0; index < length; index++) { 2998 Method* const m = methods->at(index); 2999 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3000 m->set_vtable_index(index); 3001 } 3002 } 3003 // Sort method array by ascending method name (for faster lookups & vtable construction) 3004 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3005 Method::sort_methods(methods); 3006 3007 intArray* method_ordering = NULL; 3008 // If JVMTI original method ordering or sharing is enabled construct int 3009 // array remembering the original ordering 3010 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 3011 method_ordering = new intArray(length, length, -1); 3012 for (int index = 0; index < length; index++) { 3013 Method* const m = methods->at(index); 3014 const int old_index = m->vtable_index(); 3015 assert(old_index >= 0 && old_index < length, "invalid method index"); 3016 method_ordering->at_put(index, old_index); 3017 m->set_vtable_index(Method::invalid_vtable_index); 3018 } 3019 } 3020 return method_ordering; 3021 } 3022 3023 // Parse generic_signature attribute for methods and fields 3024 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3025 TRAPS) { 3026 assert(cfs != NULL, "invariant"); 3027 3028 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3029 const u2 generic_signature_index = cfs->get_u2_fast(); 3030 check_property( 3031 valid_symbol_at(generic_signature_index), 3032 "Invalid Signature attribute at constant pool index %u in class file %s", 3033 generic_signature_index, CHECK_0); 3034 return generic_signature_index; 3035 } 3036 3037 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3038 TRAPS) { 3039 3040 assert(cfs != NULL, "invariant"); 3041 3042 cfs->guarantee_more(2, CHECK); // sourcefile_index 3043 const u2 sourcefile_index = cfs->get_u2_fast(); 3044 check_property( 3045 valid_symbol_at(sourcefile_index), 3046 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3047 sourcefile_index, CHECK); 3048 set_class_sourcefile_index(sourcefile_index); 3049 } 3050 3051 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3052 int length, 3053 TRAPS) { 3054 assert(cfs != NULL, "invariant"); 3055 3056 const u1* const sde_buffer = cfs->current(); 3057 assert(sde_buffer != NULL, "null sde buffer"); 3058 3059 // Don't bother storing it if there is no way to retrieve it 3060 if (JvmtiExport::can_get_source_debug_extension()) { 3061 assert((length+1) > length, "Overflow checking"); 3062 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3063 for (int i = 0; i < length; i++) { 3064 sde[i] = sde_buffer[i]; 3065 } 3066 sde[length] = '\0'; 3067 set_class_sde_buffer((const char*)sde, length); 3068 } 3069 // Got utf8 string, set stream position forward 3070 cfs->skip_u1(length, CHECK); 3071 } 3072 3073 3074 // Inner classes can be static, private or protected (classic VM does this) 3075 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3076 JVM_ACC_PRIVATE | \ 3077 JVM_ACC_PROTECTED | \ 3078 JVM_ACC_STATIC \ 3079 ) 3080 3081 // Return number of classes in the inner classes attribute table 3082 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3083 const u1* const inner_classes_attribute_start, 3084 bool parsed_enclosingmethod_attribute, 3085 u2 enclosing_method_class_index, 3086 u2 enclosing_method_method_index, 3087 TRAPS) { 3088 const u1* const current_mark = cfs->current(); 3089 u2 length = 0; 3090 if (inner_classes_attribute_start != NULL) { 3091 cfs->set_current(inner_classes_attribute_start); 3092 cfs->guarantee_more(2, CHECK_0); // length 3093 length = cfs->get_u2_fast(); 3094 } 3095 3096 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3097 // method data: 3098 // [inner_class_info_index, 3099 // outer_class_info_index, 3100 // inner_name_index, 3101 // inner_class_access_flags, 3102 // ... 3103 // enclosing_method_class_index, 3104 // enclosing_method_method_index] 3105 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3106 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3107 _inner_classes = inner_classes; 3108 3109 int index = 0; 3110 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3111 for (int n = 0; n < length; n++) { 3112 // Inner class index 3113 const u2 inner_class_info_index = cfs->get_u2_fast(); 3114 check_property( 3115 valid_klass_reference_at(inner_class_info_index), 3116 "inner_class_info_index %u has bad constant type in class file %s", 3117 inner_class_info_index, CHECK_0); 3118 // Outer class index 3119 const u2 outer_class_info_index = cfs->get_u2_fast(); 3120 check_property( 3121 outer_class_info_index == 0 || 3122 valid_klass_reference_at(outer_class_info_index), 3123 "outer_class_info_index %u has bad constant type in class file %s", 3124 outer_class_info_index, CHECK_0); 3125 // Inner class name 3126 const u2 inner_name_index = cfs->get_u2_fast(); 3127 check_property( 3128 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3129 "inner_name_index %u has bad constant type in class file %s", 3130 inner_name_index, CHECK_0); 3131 if (_need_verify) { 3132 guarantee_property(inner_class_info_index != outer_class_info_index, 3133 "Class is both outer and inner class in class file %s", CHECK_0); 3134 } 3135 // Access flags 3136 jint flags; 3137 // JVM_ACC_MODULE is defined in JDK-9 and later. 3138 if (_major_version >= JAVA_9_VERSION) { 3139 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3140 } else { 3141 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3142 } 3143 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3144 // Set abstract bit for old class files for backward compatibility 3145 flags |= JVM_ACC_ABSTRACT; 3146 } 3147 verify_legal_class_modifiers(flags, CHECK_0); 3148 AccessFlags inner_access_flags(flags); 3149 3150 inner_classes->at_put(index++, inner_class_info_index); 3151 inner_classes->at_put(index++, outer_class_info_index); 3152 inner_classes->at_put(index++, inner_name_index); 3153 inner_classes->at_put(index++, inner_access_flags.as_short()); 3154 } 3155 3156 // 4347400: make sure there's no duplicate entry in the classes array 3157 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3158 for(int i = 0; i < length * 4; i += 4) { 3159 for(int j = i + 4; j < length * 4; j += 4) { 3160 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3161 inner_classes->at(i+1) != inner_classes->at(j+1) || 3162 inner_classes->at(i+2) != inner_classes->at(j+2) || 3163 inner_classes->at(i+3) != inner_classes->at(j+3)), 3164 "Duplicate entry in InnerClasses in class file %s", 3165 CHECK_0); 3166 } 3167 } 3168 } 3169 3170 // Set EnclosingMethod class and method indexes. 3171 if (parsed_enclosingmethod_attribute) { 3172 inner_classes->at_put(index++, enclosing_method_class_index); 3173 inner_classes->at_put(index++, enclosing_method_method_index); 3174 } 3175 assert(index == size, "wrong size"); 3176 3177 // Restore buffer's current position. 3178 cfs->set_current(current_mark); 3179 3180 return length; 3181 } 3182 3183 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3184 const u1* const nest_members_attribute_start, 3185 TRAPS) { 3186 const u1* const current_mark = cfs->current(); 3187 u2 length = 0; 3188 if (nest_members_attribute_start != NULL) { 3189 cfs->set_current(nest_members_attribute_start); 3190 cfs->guarantee_more(2, CHECK_0); // length 3191 length = cfs->get_u2_fast(); 3192 } 3193 const int size = length; 3194 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3195 _nest_members = nest_members; 3196 3197 int index = 0; 3198 cfs->guarantee_more(2 * length, CHECK_0); 3199 for (int n = 0; n < length; n++) { 3200 const u2 class_info_index = cfs->get_u2_fast(); 3201 check_property( 3202 valid_klass_reference_at(class_info_index), 3203 "Nest member class_info_index %u has bad constant type in class file %s", 3204 class_info_index, CHECK_0); 3205 nest_members->at_put(index++, class_info_index); 3206 } 3207 assert(index == size, "wrong size"); 3208 3209 // Restore buffer's current position. 3210 cfs->set_current(current_mark); 3211 3212 return length; 3213 } 3214 3215 // Record { 3216 // u2 attribute_name_index; 3217 // u4 attribute_length; 3218 // u2 components_count; 3219 // component_info components[components_count]; 3220 // } 3221 // component_info { 3222 // u2 name_index; 3223 // u2 descriptor_index 3224 // u2 attributes_count; 3225 // attribute_info_attributes[attributes_count]; 3226 // } 3227 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, 3228 const ConstantPool* cp, 3229 const u1* const record_attribute_start, 3230 TRAPS) { 3231 const u1* const current_mark = cfs->current(); 3232 int components_count = 0; 3233 unsigned int calculate_attr_size = 0; 3234 if (record_attribute_start != NULL) { 3235 cfs->set_current(record_attribute_start); 3236 cfs->guarantee_more(2, CHECK_0); // num of components 3237 components_count = (int)cfs->get_u2_fast(); 3238 calculate_attr_size = 2; 3239 } 3240 3241 Array<RecordComponent*>* const record_components = 3242 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0); 3243 _record_components = record_components; 3244 3245 for (int x = 0; x < components_count; x++) { 3246 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count 3247 3248 const u2 name_index = cfs->get_u2_fast(); 3249 check_property(valid_symbol_at(name_index), 3250 "Invalid constant pool index %u for name in Record attribute in class file %s", 3251 name_index, CHECK_0); 3252 const Symbol* const name = cp->symbol_at(name_index); 3253 verify_legal_field_name(name, CHECK_0); 3254 3255 const u2 descriptor_index = cfs->get_u2_fast(); 3256 check_property(valid_symbol_at(descriptor_index), 3257 "Invalid constant pool index %u for descriptor in Record attribute in class file %s", 3258 descriptor_index, CHECK_0); 3259 const Symbol* const descr = cp->symbol_at(descriptor_index); 3260 verify_legal_field_signature(name, descr, CHECK_0); 3261 3262 const u2 attributes_count = cfs->get_u2_fast(); 3263 calculate_attr_size += 6; 3264 u2 generic_sig_index = 0; 3265 const u1* runtime_visible_annotations = NULL; 3266 int runtime_visible_annotations_length = 0; 3267 const u1* runtime_invisible_annotations = NULL; 3268 int runtime_invisible_annotations_length = 0; 3269 bool runtime_invisible_annotations_exists = false; 3270 const u1* runtime_visible_type_annotations = NULL; 3271 int runtime_visible_type_annotations_length = 0; 3272 const u1* runtime_invisible_type_annotations = NULL; 3273 int runtime_invisible_type_annotations_length = 0; 3274 bool runtime_invisible_type_annotations_exists = false; 3275 3276 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, 3277 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. 3278 for (int y = 0; y < attributes_count; y++) { 3279 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length 3280 const u2 attribute_name_index = cfs->get_u2_fast(); 3281 const u4 attribute_length = cfs->get_u4_fast(); 3282 calculate_attr_size += 6; 3283 check_property( 3284 valid_symbol_at(attribute_name_index), 3285 "Invalid Record attribute name index %u in class file %s", 3286 attribute_name_index, CHECK_0); 3287 3288 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 3289 if (attribute_name == vmSymbols::tag_signature()) { 3290 if (generic_sig_index != 0) { 3291 classfile_parse_error( 3292 "Multiple Signature attributes for Record component in class file %s", 3293 CHECK_0); 3294 } 3295 if (attribute_length != 2) { 3296 classfile_parse_error( 3297 "Invalid Signature attribute length %u in Record component in class file %s", 3298 attribute_length, CHECK_0); 3299 } 3300 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); 3301 3302 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 3303 if (runtime_visible_annotations != NULL) { 3304 classfile_parse_error( 3305 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0); 3306 } 3307 runtime_visible_annotations_length = attribute_length; 3308 runtime_visible_annotations = cfs->current(); 3309 3310 assert(runtime_visible_annotations != NULL, "null record component visible annotation"); 3311 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); 3312 cfs->skip_u1_fast(runtime_visible_annotations_length); 3313 3314 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 3315 if (runtime_invisible_annotations_exists) { 3316 classfile_parse_error( 3317 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0); 3318 } 3319 runtime_invisible_annotations_exists = true; 3320 if (PreserveAllAnnotations) { 3321 runtime_invisible_annotations_length = attribute_length; 3322 runtime_invisible_annotations = cfs->current(); 3323 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation"); 3324 } 3325 cfs->skip_u1(attribute_length, CHECK_0); 3326 3327 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 3328 if (runtime_visible_type_annotations != NULL) { 3329 classfile_parse_error( 3330 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0); 3331 } 3332 runtime_visible_type_annotations_length = attribute_length; 3333 runtime_visible_type_annotations = cfs->current(); 3334 3335 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation"); 3336 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); 3337 cfs->skip_u1_fast(runtime_visible_type_annotations_length); 3338 3339 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 3340 if (runtime_invisible_type_annotations_exists) { 3341 classfile_parse_error( 3342 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0); 3343 } 3344 runtime_invisible_type_annotations_exists = true; 3345 if (PreserveAllAnnotations) { 3346 runtime_invisible_type_annotations_length = attribute_length; 3347 runtime_invisible_type_annotations = cfs->current(); 3348 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation"); 3349 } 3350 cfs->skip_u1(attribute_length, CHECK_0); 3351 3352 } else { 3353 // Skip unknown attributes 3354 cfs->skip_u1(attribute_length, CHECK_0); 3355 } 3356 calculate_attr_size += attribute_length; 3357 } // End of attributes For loop 3358 3359 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations, 3360 runtime_visible_annotations_length, 3361 runtime_invisible_annotations, 3362 runtime_invisible_annotations_length, 3363 CHECK_0); 3364 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations, 3365 runtime_visible_type_annotations_length, 3366 runtime_invisible_type_annotations, 3367 runtime_invisible_type_annotations_length, 3368 CHECK_0); 3369 3370 RecordComponent* record_component = 3371 RecordComponent::allocate(_loader_data, name_index, descriptor_index, 3372 attributes_count, generic_sig_index, 3373 annotations, type_annotations, CHECK_0); 3374 record_components->at_put(x, record_component); 3375 } // End of component processing loop 3376 3377 // Restore buffer's current position. 3378 cfs->set_current(current_mark); 3379 return calculate_attr_size; 3380 } 3381 3382 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3383 set_class_synthetic_flag(true); 3384 } 3385 3386 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3387 assert(cfs != NULL, "invariant"); 3388 3389 const u2 signature_index = cfs->get_u2(CHECK); 3390 check_property( 3391 valid_symbol_at(signature_index), 3392 "Invalid constant pool index %u in Signature attribute in class file %s", 3393 signature_index, CHECK); 3394 set_class_generic_signature_index(signature_index); 3395 } 3396 3397 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3398 ConstantPool* cp, 3399 u4 attribute_byte_length, 3400 TRAPS) { 3401 assert(cfs != NULL, "invariant"); 3402 assert(cp != NULL, "invariant"); 3403 3404 const u1* const current_start = cfs->current(); 3405 3406 guarantee_property(attribute_byte_length >= sizeof(u2), 3407 "Invalid BootstrapMethods attribute length %u in class file %s", 3408 attribute_byte_length, 3409 CHECK); 3410 3411 cfs->guarantee_more(attribute_byte_length, CHECK); 3412 3413 const int attribute_array_length = cfs->get_u2_fast(); 3414 3415 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3416 "Short length on BootstrapMethods in class file %s", 3417 CHECK); 3418 3419 3420 // The attribute contains a counted array of counted tuples of shorts, 3421 // represending bootstrap specifiers: 3422 // length*{bootstrap_method_index, argument_count*{argument_index}} 3423 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3424 // operand_count = number of shorts in attr, except for leading length 3425 3426 // The attribute is copied into a short[] array. 3427 // The array begins with a series of short[2] pairs, one for each tuple. 3428 const int index_size = (attribute_array_length * 2); 3429 3430 Array<u2>* const operands = 3431 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3432 3433 // Eagerly assign operands so they will be deallocated with the constant 3434 // pool if there is an error. 3435 cp->set_operands(operands); 3436 3437 int operand_fill_index = index_size; 3438 const int cp_size = cp->length(); 3439 3440 for (int n = 0; n < attribute_array_length; n++) { 3441 // Store a 32-bit offset into the header of the operand array. 3442 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3443 3444 // Read a bootstrap specifier. 3445 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3446 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3447 const u2 argument_count = cfs->get_u2_fast(); 3448 check_property( 3449 valid_cp_range(bootstrap_method_index, cp_size) && 3450 cp->tag_at(bootstrap_method_index).is_method_handle(), 3451 "bootstrap_method_index %u has bad constant type in class file %s", 3452 bootstrap_method_index, 3453 CHECK); 3454 3455 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3456 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3457 CHECK); 3458 3459 operands->at_put(operand_fill_index++, bootstrap_method_index); 3460 operands->at_put(operand_fill_index++, argument_count); 3461 3462 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3463 for (int j = 0; j < argument_count; j++) { 3464 const u2 argument_index = cfs->get_u2_fast(); 3465 check_property( 3466 valid_cp_range(argument_index, cp_size) && 3467 cp->tag_at(argument_index).is_loadable_constant(), 3468 "argument_index %u has bad constant type in class file %s", 3469 argument_index, 3470 CHECK); 3471 operands->at_put(operand_fill_index++, argument_index); 3472 } 3473 } 3474 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3475 "Bad length on BootstrapMethods in class file %s", 3476 CHECK); 3477 } 3478 3479 bool ClassFileParser::supports_records() { 3480 return _major_version == JVM_CLASSFILE_MAJOR_VERSION && 3481 _minor_version == JAVA_PREVIEW_MINOR_VERSION && 3482 Arguments::enable_preview(); 3483 } 3484 3485 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3486 ConstantPool* cp, 3487 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3488 TRAPS) { 3489 assert(cfs != NULL, "invariant"); 3490 assert(cp != NULL, "invariant"); 3491 assert(parsed_annotations != NULL, "invariant"); 3492 3493 // Set inner classes attribute to default sentinel 3494 _inner_classes = Universe::the_empty_short_array(); 3495 // Set nest members attribute to default sentinel 3496 _nest_members = Universe::the_empty_short_array(); 3497 cfs->guarantee_more(2, CHECK); // attributes_count 3498 u2 attributes_count = cfs->get_u2_fast(); 3499 bool parsed_sourcefile_attribute = false; 3500 bool parsed_innerclasses_attribute = false; 3501 bool parsed_nest_members_attribute = false; 3502 bool parsed_nest_host_attribute = false; 3503 bool parsed_record_attribute = false; 3504 bool parsed_enclosingmethod_attribute = false; 3505 bool parsed_bootstrap_methods_attribute = false; 3506 const u1* runtime_visible_annotations = NULL; 3507 int runtime_visible_annotations_length = 0; 3508 const u1* runtime_invisible_annotations = NULL; 3509 int runtime_invisible_annotations_length = 0; 3510 const u1* runtime_visible_type_annotations = NULL; 3511 int runtime_visible_type_annotations_length = 0; 3512 const u1* runtime_invisible_type_annotations = NULL; 3513 int runtime_invisible_type_annotations_length = 0; 3514 bool runtime_invisible_type_annotations_exists = false; 3515 bool runtime_invisible_annotations_exists = false; 3516 bool parsed_source_debug_ext_annotations_exist = false; 3517 const u1* inner_classes_attribute_start = NULL; 3518 u4 inner_classes_attribute_length = 0; 3519 u2 enclosing_method_class_index = 0; 3520 u2 enclosing_method_method_index = 0; 3521 const u1* nest_members_attribute_start = NULL; 3522 u4 nest_members_attribute_length = 0; 3523 const u1* record_attribute_start = NULL; 3524 u4 record_attribute_length = 0; 3525 3526 // Iterate over attributes 3527 while (attributes_count--) { 3528 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3529 const u2 attribute_name_index = cfs->get_u2_fast(); 3530 const u4 attribute_length = cfs->get_u4_fast(); 3531 check_property( 3532 valid_symbol_at(attribute_name_index), 3533 "Attribute name has bad constant pool index %u in class file %s", 3534 attribute_name_index, CHECK); 3535 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3536 if (tag == vmSymbols::tag_source_file()) { 3537 // Check for SourceFile tag 3538 if (_need_verify) { 3539 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3540 } 3541 if (parsed_sourcefile_attribute) { 3542 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3543 } else { 3544 parsed_sourcefile_attribute = true; 3545 } 3546 parse_classfile_sourcefile_attribute(cfs, CHECK); 3547 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3548 // Check for SourceDebugExtension tag 3549 if (parsed_source_debug_ext_annotations_exist) { 3550 classfile_parse_error( 3551 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3552 } 3553 parsed_source_debug_ext_annotations_exist = true; 3554 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3555 } else if (tag == vmSymbols::tag_inner_classes()) { 3556 // Check for InnerClasses tag 3557 if (parsed_innerclasses_attribute) { 3558 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3559 } else { 3560 parsed_innerclasses_attribute = true; 3561 } 3562 inner_classes_attribute_start = cfs->current(); 3563 inner_classes_attribute_length = attribute_length; 3564 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3565 } else if (tag == vmSymbols::tag_synthetic()) { 3566 // Check for Synthetic tag 3567 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3568 if (attribute_length != 0) { 3569 classfile_parse_error( 3570 "Invalid Synthetic classfile attribute length %u in class file %s", 3571 attribute_length, CHECK); 3572 } 3573 parse_classfile_synthetic_attribute(CHECK); 3574 } else if (tag == vmSymbols::tag_deprecated()) { 3575 // Check for Deprecatd tag - 4276120 3576 if (attribute_length != 0) { 3577 classfile_parse_error( 3578 "Invalid Deprecated classfile attribute length %u in class file %s", 3579 attribute_length, CHECK); 3580 } 3581 } else if (_major_version >= JAVA_1_5_VERSION) { 3582 if (tag == vmSymbols::tag_signature()) { 3583 if (_generic_signature_index != 0) { 3584 classfile_parse_error( 3585 "Multiple Signature attributes in class file %s", CHECK); 3586 } 3587 if (attribute_length != 2) { 3588 classfile_parse_error( 3589 "Wrong Signature attribute length %u in class file %s", 3590 attribute_length, CHECK); 3591 } 3592 parse_classfile_signature_attribute(cfs, CHECK); 3593 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3594 if (runtime_visible_annotations != NULL) { 3595 classfile_parse_error( 3596 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3597 } 3598 runtime_visible_annotations_length = attribute_length; 3599 runtime_visible_annotations = cfs->current(); 3600 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3601 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3602 parse_annotations(cp, 3603 runtime_visible_annotations, 3604 runtime_visible_annotations_length, 3605 parsed_annotations, 3606 _loader_data, 3607 _can_access_vm_annotations, 3608 CHECK); 3609 cfs->skip_u1_fast(runtime_visible_annotations_length); 3610 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3611 if (runtime_invisible_annotations_exists) { 3612 classfile_parse_error( 3613 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3614 } 3615 runtime_invisible_annotations_exists = true; 3616 if (PreserveAllAnnotations) { 3617 runtime_invisible_annotations_length = attribute_length; 3618 runtime_invisible_annotations = cfs->current(); 3619 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3620 } 3621 cfs->skip_u1(attribute_length, CHECK); 3622 } else if (tag == vmSymbols::tag_enclosing_method()) { 3623 if (parsed_enclosingmethod_attribute) { 3624 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3625 } else { 3626 parsed_enclosingmethod_attribute = true; 3627 } 3628 guarantee_property(attribute_length == 4, 3629 "Wrong EnclosingMethod attribute length %u in class file %s", 3630 attribute_length, CHECK); 3631 cfs->guarantee_more(4, CHECK); // class_index, method_index 3632 enclosing_method_class_index = cfs->get_u2_fast(); 3633 enclosing_method_method_index = cfs->get_u2_fast(); 3634 if (enclosing_method_class_index == 0) { 3635 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3636 } 3637 // Validate the constant pool indices and types 3638 check_property(valid_klass_reference_at(enclosing_method_class_index), 3639 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3640 if (enclosing_method_method_index != 0 && 3641 (!cp->is_within_bounds(enclosing_method_method_index) || 3642 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3643 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3644 } 3645 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3646 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3647 if (parsed_bootstrap_methods_attribute) { 3648 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3649 } 3650 parsed_bootstrap_methods_attribute = true; 3651 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3652 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3653 if (runtime_visible_type_annotations != NULL) { 3654 classfile_parse_error( 3655 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3656 } 3657 runtime_visible_type_annotations_length = attribute_length; 3658 runtime_visible_type_annotations = cfs->current(); 3659 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3660 // No need for the VM to parse Type annotations 3661 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3662 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3663 if (runtime_invisible_type_annotations_exists) { 3664 classfile_parse_error( 3665 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3666 } else { 3667 runtime_invisible_type_annotations_exists = true; 3668 } 3669 if (PreserveAllAnnotations) { 3670 runtime_invisible_type_annotations_length = attribute_length; 3671 runtime_invisible_type_annotations = cfs->current(); 3672 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3673 } 3674 cfs->skip_u1(attribute_length, CHECK); 3675 } else if (_major_version >= JAVA_11_VERSION) { 3676 if (tag == vmSymbols::tag_nest_members()) { 3677 // Check for NestMembers tag 3678 if (parsed_nest_members_attribute) { 3679 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK); 3680 } else { 3681 parsed_nest_members_attribute = true; 3682 } 3683 if (parsed_nest_host_attribute) { 3684 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK); 3685 } 3686 nest_members_attribute_start = cfs->current(); 3687 nest_members_attribute_length = attribute_length; 3688 cfs->skip_u1(nest_members_attribute_length, CHECK); 3689 } else if (tag == vmSymbols::tag_nest_host()) { 3690 if (parsed_nest_host_attribute) { 3691 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK); 3692 } else { 3693 parsed_nest_host_attribute = true; 3694 } 3695 if (parsed_nest_members_attribute) { 3696 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK); 3697 } 3698 if (_need_verify) { 3699 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3700 } 3701 cfs->guarantee_more(2, CHECK); 3702 u2 class_info_index = cfs->get_u2_fast(); 3703 check_property( 3704 valid_klass_reference_at(class_info_index), 3705 "Nest-host class_info_index %u has bad constant type in class file %s", 3706 class_info_index, CHECK); 3707 _nest_host = class_info_index; 3708 } else if (_major_version >= JAVA_14_VERSION) { 3709 if (tag == vmSymbols::tag_record()) { 3710 // Skip over Record attribute if not supported or if super class is 3711 // not java.lang.Record. 3712 if (supports_records() && 3713 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) { 3714 if (parsed_record_attribute) { 3715 classfile_parse_error("Multiple Record attributes in class file %s", CHECK); 3716 } 3717 // Check that class is final and not abstract. 3718 if (!_access_flags.is_final() || _access_flags.is_abstract()) { 3719 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK); 3720 } 3721 parsed_record_attribute = true; 3722 record_attribute_start = cfs->current(); 3723 record_attribute_length = attribute_length; 3724 } else if (log_is_enabled(Info, class, record)) { 3725 // Log why the Record attribute was ignored. Note that if the 3726 // class file version is JVM_CLASSFILE_MAJOR_VERSION.65535 and 3727 // --enable-preview wasn't specified then a java.lang.UnsupportedClassVersionError 3728 // exception would have been thrown. 3729 ResourceMark rm(THREAD); 3730 if (supports_records()) { 3731 log_info(class, record)( 3732 "Ignoring Record attribute in class %s because super type is not java.lang.Record", 3733 _class_name->as_C_string()); 3734 } else { 3735 log_info(class, record)( 3736 "Ignoring Record attribute in class %s because class file version is not %d.65535", 3737 _class_name->as_C_string(), JVM_CLASSFILE_MAJOR_VERSION); 3738 } 3739 } 3740 cfs->skip_u1(attribute_length, CHECK); 3741 } else { 3742 // Unknown attribute 3743 cfs->skip_u1(attribute_length, CHECK); 3744 } 3745 } else { 3746 // Unknown attribute 3747 cfs->skip_u1(attribute_length, CHECK); 3748 } 3749 } else { 3750 // Unknown attribute 3751 cfs->skip_u1(attribute_length, CHECK); 3752 } 3753 } else { 3754 // Unknown attribute 3755 cfs->skip_u1(attribute_length, CHECK); 3756 } 3757 } 3758 _class_annotations = assemble_annotations(runtime_visible_annotations, 3759 runtime_visible_annotations_length, 3760 runtime_invisible_annotations, 3761 runtime_invisible_annotations_length, 3762 CHECK); 3763 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations, 3764 runtime_visible_type_annotations_length, 3765 runtime_invisible_type_annotations, 3766 runtime_invisible_type_annotations_length, 3767 CHECK); 3768 3769 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3770 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3771 cfs, 3772 inner_classes_attribute_start, 3773 parsed_innerclasses_attribute, 3774 enclosing_method_class_index, 3775 enclosing_method_method_index, 3776 CHECK); 3777 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3778 guarantee_property( 3779 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3780 "Wrong InnerClasses attribute length in class file %s", CHECK); 3781 } 3782 } 3783 3784 if (parsed_nest_members_attribute) { 3785 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3786 cfs, 3787 nest_members_attribute_start, 3788 CHECK); 3789 if (_need_verify) { 3790 guarantee_property( 3791 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3792 "Wrong NestMembers attribute length in class file %s", CHECK); 3793 } 3794 } 3795 3796 if (parsed_record_attribute) { 3797 const unsigned int calculated_attr_length = parse_classfile_record_attribute( 3798 cfs, 3799 cp, 3800 record_attribute_start, 3801 CHECK); 3802 if (_need_verify) { 3803 guarantee_property(record_attribute_length == calculated_attr_length, 3804 "Record attribute has wrong length in class file %s", 3805 CHECK); 3806 } 3807 } 3808 3809 if (_max_bootstrap_specifier_index >= 0) { 3810 guarantee_property(parsed_bootstrap_methods_attribute, 3811 "Missing BootstrapMethods attribute in class file %s", CHECK); 3812 } 3813 } 3814 3815 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3816 assert(k != NULL, "invariant"); 3817 3818 if (_synthetic_flag) 3819 k->set_is_synthetic(); 3820 if (_sourcefile_index != 0) { 3821 k->set_source_file_name_index(_sourcefile_index); 3822 } 3823 if (_generic_signature_index != 0) { 3824 k->set_generic_signature_index(_generic_signature_index); 3825 } 3826 if (_sde_buffer != NULL) { 3827 k->set_source_debug_extension(_sde_buffer, _sde_length); 3828 } 3829 } 3830 3831 // Create the Annotations object that will 3832 // hold the annotations array for the Klass. 3833 void ClassFileParser::create_combined_annotations(TRAPS) { 3834 if (_class_annotations == NULL && 3835 _class_type_annotations == NULL && 3836 _fields_annotations == NULL && 3837 _fields_type_annotations == NULL) { 3838 // Don't create the Annotations object unnecessarily. 3839 return; 3840 } 3841 3842 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3843 annotations->set_class_annotations(_class_annotations); 3844 annotations->set_class_type_annotations(_class_type_annotations); 3845 annotations->set_fields_annotations(_fields_annotations); 3846 annotations->set_fields_type_annotations(_fields_type_annotations); 3847 3848 // This is the Annotations object that will be 3849 // assigned to InstanceKlass being constructed. 3850 _combined_annotations = annotations; 3851 3852 // The annotations arrays below has been transfered the 3853 // _combined_annotations so these fields can now be cleared. 3854 _class_annotations = NULL; 3855 _class_type_annotations = NULL; 3856 _fields_annotations = NULL; 3857 _fields_type_annotations = NULL; 3858 } 3859 3860 // Transfer ownership of metadata allocated to the InstanceKlass. 3861 void ClassFileParser::apply_parsed_class_metadata( 3862 InstanceKlass* this_klass, 3863 int java_fields_count, 3864 TRAPS) { 3865 assert(this_klass != NULL, "invariant"); 3866 3867 _cp->set_pool_holder(this_klass); 3868 this_klass->set_constants(_cp); 3869 this_klass->set_fields(_fields, java_fields_count); 3870 this_klass->set_methods(_methods); 3871 this_klass->set_inner_classes(_inner_classes); 3872 this_klass->set_nest_members(_nest_members); 3873 this_klass->set_nest_host_index(_nest_host); 3874 this_klass->set_local_interfaces(_local_interfaces); 3875 this_klass->set_annotations(_combined_annotations); 3876 this_klass->set_record_components(_record_components); 3877 // Delay the setting of _transitive_interfaces until after initialize_supers() in 3878 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with 3879 // its _super. If an OOM occurs while loading the current klass, its _super field 3880 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3881 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3882 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3883 3884 // Clear out these fields so they don't get deallocated by the destructor 3885 clear_class_metadata(); 3886 } 3887 3888 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3889 int runtime_visible_annotations_length, 3890 const u1* const runtime_invisible_annotations, 3891 int runtime_invisible_annotations_length, 3892 TRAPS) { 3893 AnnotationArray* annotations = NULL; 3894 if (runtime_visible_annotations != NULL || 3895 runtime_invisible_annotations != NULL) { 3896 annotations = MetadataFactory::new_array<u1>(_loader_data, 3897 runtime_visible_annotations_length + 3898 runtime_invisible_annotations_length, 3899 CHECK_(annotations)); 3900 if (runtime_visible_annotations != NULL) { 3901 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3902 annotations->at_put(i, runtime_visible_annotations[i]); 3903 } 3904 } 3905 if (runtime_invisible_annotations != NULL) { 3906 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3907 int append = runtime_visible_annotations_length+i; 3908 annotations->at_put(append, runtime_invisible_annotations[i]); 3909 } 3910 } 3911 } 3912 return annotations; 3913 } 3914 3915 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3916 const int super_class_index, 3917 const bool need_verify, 3918 TRAPS) { 3919 assert(cp != NULL, "invariant"); 3920 const InstanceKlass* super_klass = NULL; 3921 3922 if (super_class_index == 0) { 3923 check_property(_class_name == vmSymbols::java_lang_Object(), 3924 "Invalid superclass index %u in class file %s", 3925 super_class_index, 3926 CHECK_NULL); 3927 } else { 3928 check_property(valid_klass_reference_at(super_class_index), 3929 "Invalid superclass index %u in class file %s", 3930 super_class_index, 3931 CHECK_NULL); 3932 // The class name should be legal because it is checked when parsing constant pool. 3933 // However, make sure it is not an array type. 3934 bool is_array = false; 3935 if (cp->tag_at(super_class_index).is_klass()) { 3936 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3937 if (need_verify) 3938 is_array = super_klass->is_array_klass(); 3939 } else if (need_verify) { 3940 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY); 3941 } 3942 if (need_verify) { 3943 guarantee_property(!is_array, 3944 "Bad superclass name in class file %s", CHECK_NULL); 3945 } 3946 } 3947 return super_klass; 3948 } 3949 3950 #ifndef PRODUCT 3951 static void print_field_layout(const Symbol* name, 3952 Array<u2>* fields, 3953 ConstantPool* cp, 3954 int instance_size, 3955 int instance_fields_start, 3956 int instance_fields_end, 3957 int static_fields_end) { 3958 3959 assert(name != NULL, "invariant"); 3960 3961 tty->print("%s: field layout\n", name->as_klass_external_name()); 3962 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3963 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3964 if (!fs.access_flags().is_static()) { 3965 tty->print(" @%3d \"%s\" %s\n", 3966 fs.offset(), 3967 fs.name()->as_klass_external_name(), 3968 fs.signature()->as_klass_external_name()); 3969 } 3970 } 3971 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3972 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3973 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3974 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3975 if (fs.access_flags().is_static()) { 3976 tty->print(" @%3d \"%s\" %s\n", 3977 fs.offset(), 3978 fs.name()->as_klass_external_name(), 3979 fs.signature()->as_klass_external_name()); 3980 } 3981 } 3982 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 3983 tty->print("\n"); 3984 } 3985 #endif 3986 3987 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) { 3988 _max_nonstatic_oop_maps = max_blocks; 3989 _nonstatic_oop_map_count = 0; 3990 if (max_blocks == 0) { 3991 _nonstatic_oop_maps = NULL; 3992 } else { 3993 _nonstatic_oop_maps = 3994 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps); 3995 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); 3996 } 3997 } 3998 3999 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const { 4000 assert(_nonstatic_oop_map_count > 0, "Has no oop maps"); 4001 return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1); 4002 } 4003 4004 // addition of super oop maps 4005 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { 4006 assert(nof_blocks && _nonstatic_oop_map_count == 0 && 4007 nof_blocks <= _max_nonstatic_oop_maps, "invariant"); 4008 4009 memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); 4010 _nonstatic_oop_map_count += nof_blocks; 4011 } 4012 4013 // collection of oops 4014 void OopMapBlocksBuilder::add(int offset, int count) { 4015 if (_nonstatic_oop_map_count == 0) { 4016 _nonstatic_oop_map_count++; 4017 } 4018 OopMapBlock* nonstatic_oop_map = last_oop_map(); 4019 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up 4020 nonstatic_oop_map->set_offset(offset); 4021 nonstatic_oop_map->set_count(count); 4022 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add 4023 nonstatic_oop_map->increment_count(count); 4024 } else { // Need a new one... 4025 _nonstatic_oop_map_count++; 4026 assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check"); 4027 nonstatic_oop_map = last_oop_map(); 4028 nonstatic_oop_map->set_offset(offset); 4029 nonstatic_oop_map->set_count(count); 4030 } 4031 } 4032 4033 // general purpose copy, e.g. into allocated instanceKlass 4034 void OopMapBlocksBuilder::copy(OopMapBlock* dst) { 4035 if (_nonstatic_oop_map_count != 0) { 4036 memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count); 4037 } 4038 } 4039 4040 // Sort and compact adjacent blocks 4041 void OopMapBlocksBuilder::compact() { 4042 if (_nonstatic_oop_map_count <= 1) { 4043 return; 4044 } 4045 /* 4046 * Since field layout sneeks in oops before values, we will be able to condense 4047 * blocks. There is potential to compact between super, own refs and values 4048 * containing refs. 4049 * 4050 * Currently compaction is slightly limited due to values being 8 byte aligned. 4051 * This may well change: FixMe if it doesn't, the code below is fairly general purpose 4052 * and maybe it doesn't need to be. 4053 */ 4054 qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock), 4055 (_sort_Fn)OopMapBlock::compare_offset); 4056 if (_nonstatic_oop_map_count < 2) { 4057 return; 4058 } 4059 4060 // Make a temp copy, and iterate through and copy back into the original 4061 ResourceMark rm; 4062 OopMapBlock* oop_maps_copy = 4063 NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count); 4064 OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count; 4065 copy(oop_maps_copy); 4066 OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps; 4067 unsigned int new_count = 1; 4068 oop_maps_copy++; 4069 while(oop_maps_copy < oop_maps_copy_end) { 4070 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); 4071 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { 4072 nonstatic_oop_map->increment_count(oop_maps_copy->count()); 4073 } else { 4074 nonstatic_oop_map++; 4075 new_count++; 4076 nonstatic_oop_map->set_offset(oop_maps_copy->offset()); 4077 nonstatic_oop_map->set_count(oop_maps_copy->count()); 4078 } 4079 oop_maps_copy++; 4080 } 4081 assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?"); 4082 _nonstatic_oop_map_count = new_count; 4083 } 4084 4085 void OopMapBlocksBuilder::print_on(outputStream* st) const { 4086 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps); 4087 if (_nonstatic_oop_map_count > 0) { 4088 OopMapBlock* map = _nonstatic_oop_maps; 4089 OopMapBlock* last_map = last_oop_map(); 4090 assert(map <= last_map, "Last less than first"); 4091 while (map <= last_map) { 4092 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), 4093 map->offset() + map->offset_span() - heapOopSize, map->count()); 4094 map++; 4095 } 4096 } 4097 } 4098 4099 void OopMapBlocksBuilder::print_value_on(outputStream* st) const { 4100 print_on(st); 4101 } 4102 4103 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 4104 void ClassFileParser::layout_fields(ConstantPool* cp, 4105 const FieldAllocationCount* fac, 4106 const ClassAnnotationCollector* parsed_annotations, 4107 FieldLayoutInfo* info, 4108 TRAPS) { 4109 4110 assert(cp != NULL, "invariant"); 4111 4112 // Field size and offset computation 4113 int nonstatic_field_size = _super_klass == NULL ? 0 : 4114 _super_klass->nonstatic_field_size(); 4115 4116 // Count the contended fields by type. 4117 // 4118 // We ignore static fields, because @Contended is not supported for them. 4119 // The layout code below will also ignore the static fields. 4120 int nonstatic_contended_count = 0; 4121 FieldAllocationCount fac_contended; 4122 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4123 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4124 if (fs.is_contended()) { 4125 fac_contended.count[atype]++; 4126 if (!fs.access_flags().is_static()) { 4127 nonstatic_contended_count++; 4128 } 4129 } 4130 } 4131 4132 4133 // Calculate the starting byte offsets 4134 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 4135 int next_static_double_offset = next_static_oop_offset + 4136 ((fac->count[STATIC_OOP]) * heapOopSize); 4137 if (fac->count[STATIC_DOUBLE]) { 4138 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 4139 } 4140 4141 int next_static_word_offset = next_static_double_offset + 4142 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 4143 int next_static_short_offset = next_static_word_offset + 4144 ((fac->count[STATIC_WORD]) * BytesPerInt); 4145 int next_static_byte_offset = next_static_short_offset + 4146 ((fac->count[STATIC_SHORT]) * BytesPerShort); 4147 4148 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 4149 nonstatic_field_size * heapOopSize; 4150 4151 int next_nonstatic_field_offset = nonstatic_fields_start; 4152 4153 const bool is_contended_class = parsed_annotations->is_contended(); 4154 4155 // Class is contended, pad before all the fields 4156 if (is_contended_class) { 4157 next_nonstatic_field_offset += ContendedPaddingWidth; 4158 } 4159 4160 // Compute the non-contended fields count. 4161 // The packing code below relies on these counts to determine if some field 4162 // can be squeezed into the alignment gap. Contended fields are obviously 4163 // exempt from that. 4164 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 4165 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 4166 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 4167 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 4168 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 4169 4170 // Total non-static fields count, including every contended field 4171 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 4172 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 4173 fac->count[NONSTATIC_OOP]; 4174 4175 const bool super_has_nonstatic_fields = 4176 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 4177 const bool has_nonstatic_fields = 4178 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 4179 4180 4181 // Prepare list of oops for oop map generation. 4182 // 4183 // "offset" and "count" lists are describing the set of contiguous oop 4184 // regions. offset[i] is the start of the i-th region, which then has 4185 // count[i] oops following. Before we know how many regions are required, 4186 // we pessimistically allocate the maps to fit all the oops into the 4187 // distinct regions. 4188 4189 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count(); 4190 int max_oop_map_count = super_oop_map_count + fac->count[NONSTATIC_OOP]; 4191 4192 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count); 4193 if (super_oop_map_count > 0) { 4194 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(), 4195 _super_klass->nonstatic_oop_map_count()); 4196 } 4197 4198 int first_nonstatic_oop_offset = 0; // will be set for first oop field 4199 4200 bool compact_fields = true; 4201 bool allocate_oops_first = false; 4202 4203 // The next classes have predefined hard-coded fields offsets 4204 // (see in JavaClasses::compute_hard_coded_offsets()). 4205 // Use default fields allocation order for them. 4206 if (_loader_data->class_loader() == NULL && 4207 (_class_name == vmSymbols::java_lang_ref_Reference() || 4208 _class_name == vmSymbols::java_lang_Boolean() || 4209 _class_name == vmSymbols::java_lang_Character() || 4210 _class_name == vmSymbols::java_lang_Float() || 4211 _class_name == vmSymbols::java_lang_Double() || 4212 _class_name == vmSymbols::java_lang_Byte() || 4213 _class_name == vmSymbols::java_lang_Short() || 4214 _class_name == vmSymbols::java_lang_Integer() || 4215 _class_name == vmSymbols::java_lang_Long())) { 4216 allocate_oops_first = true; // Allocate oops first 4217 compact_fields = false; // Don't compact fields 4218 } 4219 4220 int next_nonstatic_oop_offset = 0; 4221 int next_nonstatic_double_offset = 0; 4222 4223 // Rearrange fields for a given allocation style 4224 if (allocate_oops_first) { 4225 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 4226 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4227 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4228 (nonstatic_oop_count * heapOopSize); 4229 } else { 4230 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 4231 next_nonstatic_double_offset = next_nonstatic_field_offset; 4232 } 4233 4234 int nonstatic_oop_space_count = 0; 4235 int nonstatic_word_space_count = 0; 4236 int nonstatic_short_space_count = 0; 4237 int nonstatic_byte_space_count = 0; 4238 int nonstatic_oop_space_offset = 0; 4239 int nonstatic_word_space_offset = 0; 4240 int nonstatic_short_space_offset = 0; 4241 int nonstatic_byte_space_offset = 0; 4242 4243 // Try to squeeze some of the fields into the gaps due to 4244 // long/double alignment. 4245 if (nonstatic_double_count > 0) { 4246 int offset = next_nonstatic_double_offset; 4247 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 4248 if (compact_fields && offset != next_nonstatic_double_offset) { 4249 // Allocate available fields into the gap before double field. 4250 int length = next_nonstatic_double_offset - offset; 4251 assert(length == BytesPerInt, ""); 4252 nonstatic_word_space_offset = offset; 4253 if (nonstatic_word_count > 0) { 4254 nonstatic_word_count -= 1; 4255 nonstatic_word_space_count = 1; // Only one will fit 4256 length -= BytesPerInt; 4257 offset += BytesPerInt; 4258 } 4259 nonstatic_short_space_offset = offset; 4260 while (length >= BytesPerShort && nonstatic_short_count > 0) { 4261 nonstatic_short_count -= 1; 4262 nonstatic_short_space_count += 1; 4263 length -= BytesPerShort; 4264 offset += BytesPerShort; 4265 } 4266 nonstatic_byte_space_offset = offset; 4267 while (length > 0 && nonstatic_byte_count > 0) { 4268 nonstatic_byte_count -= 1; 4269 nonstatic_byte_space_count += 1; 4270 length -= 1; 4271 } 4272 // Allocate oop field in the gap if there are no other fields for that. 4273 nonstatic_oop_space_offset = offset; 4274 if (length >= heapOopSize && nonstatic_oop_count > 0 && 4275 !allocate_oops_first) { // when oop fields not first 4276 nonstatic_oop_count -= 1; 4277 nonstatic_oop_space_count = 1; // Only one will fit 4278 length -= heapOopSize; 4279 offset += heapOopSize; 4280 } 4281 } 4282 } 4283 4284 int next_nonstatic_word_offset = next_nonstatic_double_offset + 4285 (nonstatic_double_count * BytesPerLong); 4286 int next_nonstatic_short_offset = next_nonstatic_word_offset + 4287 (nonstatic_word_count * BytesPerInt); 4288 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 4289 (nonstatic_short_count * BytesPerShort); 4290 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 4291 nonstatic_byte_count; 4292 4293 // let oops jump before padding with this allocation style 4294 if (!allocate_oops_first) { 4295 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 4296 if( nonstatic_oop_count > 0 ) { 4297 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 4298 } 4299 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 4300 } 4301 4302 // Iterate over fields again and compute correct offsets. 4303 // The field allocation type was temporarily stored in the offset slot. 4304 // oop fields are located before non-oop fields (static and non-static). 4305 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4306 4307 // skip already laid out fields 4308 if (fs.is_offset_set()) continue; 4309 4310 // contended instance fields are handled below 4311 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 4312 4313 int real_offset = 0; 4314 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4315 4316 // pack the rest of the fields 4317 switch (atype) { 4318 case STATIC_OOP: 4319 real_offset = next_static_oop_offset; 4320 next_static_oop_offset += heapOopSize; 4321 break; 4322 case STATIC_BYTE: 4323 real_offset = next_static_byte_offset; 4324 next_static_byte_offset += 1; 4325 break; 4326 case STATIC_SHORT: 4327 real_offset = next_static_short_offset; 4328 next_static_short_offset += BytesPerShort; 4329 break; 4330 case STATIC_WORD: 4331 real_offset = next_static_word_offset; 4332 next_static_word_offset += BytesPerInt; 4333 break; 4334 case STATIC_DOUBLE: 4335 real_offset = next_static_double_offset; 4336 next_static_double_offset += BytesPerLong; 4337 break; 4338 case NONSTATIC_OOP: 4339 if( nonstatic_oop_space_count > 0 ) { 4340 real_offset = nonstatic_oop_space_offset; 4341 nonstatic_oop_space_offset += heapOopSize; 4342 nonstatic_oop_space_count -= 1; 4343 } else { 4344 real_offset = next_nonstatic_oop_offset; 4345 next_nonstatic_oop_offset += heapOopSize; 4346 } 4347 nonstatic_oop_maps->add(real_offset, 1); 4348 break; 4349 case NONSTATIC_BYTE: 4350 if( nonstatic_byte_space_count > 0 ) { 4351 real_offset = nonstatic_byte_space_offset; 4352 nonstatic_byte_space_offset += 1; 4353 nonstatic_byte_space_count -= 1; 4354 } else { 4355 real_offset = next_nonstatic_byte_offset; 4356 next_nonstatic_byte_offset += 1; 4357 } 4358 break; 4359 case NONSTATIC_SHORT: 4360 if( nonstatic_short_space_count > 0 ) { 4361 real_offset = nonstatic_short_space_offset; 4362 nonstatic_short_space_offset += BytesPerShort; 4363 nonstatic_short_space_count -= 1; 4364 } else { 4365 real_offset = next_nonstatic_short_offset; 4366 next_nonstatic_short_offset += BytesPerShort; 4367 } 4368 break; 4369 case NONSTATIC_WORD: 4370 if( nonstatic_word_space_count > 0 ) { 4371 real_offset = nonstatic_word_space_offset; 4372 nonstatic_word_space_offset += BytesPerInt; 4373 nonstatic_word_space_count -= 1; 4374 } else { 4375 real_offset = next_nonstatic_word_offset; 4376 next_nonstatic_word_offset += BytesPerInt; 4377 } 4378 break; 4379 case NONSTATIC_DOUBLE: 4380 real_offset = next_nonstatic_double_offset; 4381 next_nonstatic_double_offset += BytesPerLong; 4382 break; 4383 default: 4384 ShouldNotReachHere(); 4385 } 4386 fs.set_offset(real_offset); 4387 } 4388 4389 4390 // Handle the contended cases. 4391 // 4392 // Each contended field should not intersect the cache line with another contended field. 4393 // In the absence of alignment information, we end up with pessimistically separating 4394 // the fields with full-width padding. 4395 // 4396 // Additionally, this should not break alignment for the fields, so we round the alignment up 4397 // for each field. 4398 if (nonstatic_contended_count > 0) { 4399 4400 // if there is at least one contended field, we need to have pre-padding for them 4401 next_nonstatic_padded_offset += ContendedPaddingWidth; 4402 4403 // collect all contended groups 4404 ResourceBitMap bm(cp->size()); 4405 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4406 // skip already laid out fields 4407 if (fs.is_offset_set()) continue; 4408 4409 if (fs.is_contended()) { 4410 bm.set_bit(fs.contended_group()); 4411 } 4412 } 4413 4414 int current_group = -1; 4415 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4416 4417 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4418 4419 // skip already laid out fields 4420 if (fs.is_offset_set()) continue; 4421 4422 // skip non-contended fields and fields from different group 4423 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4424 4425 // handle statics below 4426 if (fs.access_flags().is_static()) continue; 4427 4428 int real_offset = 0; 4429 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4430 4431 switch (atype) { 4432 case NONSTATIC_BYTE: 4433 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4434 real_offset = next_nonstatic_padded_offset; 4435 next_nonstatic_padded_offset += 1; 4436 break; 4437 4438 case NONSTATIC_SHORT: 4439 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4440 real_offset = next_nonstatic_padded_offset; 4441 next_nonstatic_padded_offset += BytesPerShort; 4442 break; 4443 4444 case NONSTATIC_WORD: 4445 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4446 real_offset = next_nonstatic_padded_offset; 4447 next_nonstatic_padded_offset += BytesPerInt; 4448 break; 4449 4450 case NONSTATIC_DOUBLE: 4451 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4452 real_offset = next_nonstatic_padded_offset; 4453 next_nonstatic_padded_offset += BytesPerLong; 4454 break; 4455 4456 case NONSTATIC_OOP: 4457 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4458 real_offset = next_nonstatic_padded_offset; 4459 next_nonstatic_padded_offset += heapOopSize; 4460 nonstatic_oop_maps->add(real_offset, 1); 4461 break; 4462 4463 default: 4464 ShouldNotReachHere(); 4465 } 4466 4467 if (fs.contended_group() == 0) { 4468 // Contended group defines the equivalence class over the fields: 4469 // the fields within the same contended group are not inter-padded. 4470 // The only exception is default group, which does not incur the 4471 // equivalence, and so requires intra-padding. 4472 next_nonstatic_padded_offset += ContendedPaddingWidth; 4473 } 4474 4475 fs.set_offset(real_offset); 4476 } // for 4477 4478 // Start laying out the next group. 4479 // Note that this will effectively pad the last group in the back; 4480 // this is expected to alleviate memory contention effects for 4481 // subclass fields and/or adjacent object. 4482 // If this was the default group, the padding is already in place. 4483 if (current_group != 0) { 4484 next_nonstatic_padded_offset += ContendedPaddingWidth; 4485 } 4486 } 4487 4488 // handle static fields 4489 } 4490 4491 // Entire class is contended, pad in the back. 4492 // This helps to alleviate memory contention effects for subclass fields 4493 // and/or adjacent object. 4494 if (is_contended_class) { 4495 next_nonstatic_padded_offset += ContendedPaddingWidth; 4496 } 4497 4498 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4499 4500 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize); 4501 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4502 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4503 4504 int static_field_size = (static_fields_end - 4505 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4506 nonstatic_field_size = nonstatic_field_size + 4507 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4508 4509 int instance_size = align_object_size(instance_end / wordSize); 4510 4511 assert(instance_size == align_object_size(align_up( 4512 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 4513 wordSize) / wordSize), "consistent layout helper value"); 4514 4515 // Invariant: nonstatic_field end/start should only change if there are 4516 // nonstatic fields in the class, or if the class is contended. We compare 4517 // against the non-aligned value, so that end alignment will not fail the 4518 // assert without actually having the fields. 4519 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4520 is_contended_class || 4521 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4522 4523 // Number of non-static oop map blocks allocated at end of klass. 4524 nonstatic_oop_maps->compact(); 4525 4526 #ifndef PRODUCT 4527 if (PrintFieldLayout) { 4528 print_field_layout(_class_name, 4529 _fields, 4530 cp, 4531 instance_size, 4532 nonstatic_fields_start, 4533 nonstatic_fields_end, 4534 static_fields_end); 4535 } 4536 4537 #endif 4538 // Pass back information needed for InstanceKlass creation 4539 info->oop_map_blocks = nonstatic_oop_maps; 4540 info->_instance_size = instance_size; 4541 info->_static_field_size = static_field_size; 4542 info->_nonstatic_field_size = nonstatic_field_size; 4543 info->_has_nonstatic_fields = has_nonstatic_fields; 4544 } 4545 4546 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4547 assert(ik != NULL, "invariant"); 4548 4549 const Klass* const super = ik->super(); 4550 4551 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4552 // in which case we don't have to register objects as finalizable 4553 if (!_has_empty_finalizer) { 4554 if (_has_finalizer || 4555 (super != NULL && super->has_finalizer())) { 4556 ik->set_has_finalizer(); 4557 } 4558 } 4559 4560 #ifdef ASSERT 4561 bool f = false; 4562 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4563 vmSymbols::void_method_signature()); 4564 if (m != NULL && !m->is_empty_method()) { 4565 f = true; 4566 } 4567 4568 // Spec doesn't prevent agent from redefinition of empty finalizer. 4569 // Despite the fact that it's generally bad idea and redefined finalizer 4570 // will not work as expected we shouldn't abort vm in this case 4571 if (!ik->has_redefined_this_or_super()) { 4572 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4573 } 4574 #endif 4575 4576 // Check if this klass supports the java.lang.Cloneable interface 4577 if (SystemDictionary::Cloneable_klass_loaded()) { 4578 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4579 ik->set_is_cloneable(); 4580 } 4581 } 4582 4583 // Check if this klass has a vanilla default constructor 4584 if (super == NULL) { 4585 // java.lang.Object has empty default constructor 4586 ik->set_has_vanilla_constructor(); 4587 } else { 4588 if (super->has_vanilla_constructor() && 4589 _has_vanilla_constructor) { 4590 ik->set_has_vanilla_constructor(); 4591 } 4592 #ifdef ASSERT 4593 bool v = false; 4594 if (super->has_vanilla_constructor()) { 4595 const Method* const constructor = 4596 ik->find_method(vmSymbols::object_initializer_name(), 4597 vmSymbols::void_method_signature()); 4598 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4599 v = true; 4600 } 4601 } 4602 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4603 #endif 4604 } 4605 4606 // If it cannot be fast-path allocated, set a bit in the layout helper. 4607 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4608 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4609 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4610 || ik->is_abstract() || ik->is_interface() 4611 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4612 || ik->size_helper() >= FastAllocateSizeLimit) { 4613 // Forbid fast-path allocation. 4614 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4615 ik->set_layout_helper(lh); 4616 } 4617 } 4618 4619 // utility methods for appending an array with check for duplicates 4620 4621 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4622 const Array<InstanceKlass*>* const ifs) { 4623 // iterate over new interfaces 4624 for (int i = 0; i < ifs->length(); i++) { 4625 InstanceKlass* const e = ifs->at(i); 4626 assert(e->is_klass() && e->is_interface(), "just checking"); 4627 // add new interface 4628 result->append_if_missing(e); 4629 } 4630 } 4631 4632 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4633 Array<InstanceKlass*>* local_ifs, 4634 ClassLoaderData* loader_data, 4635 TRAPS) { 4636 assert(local_ifs != NULL, "invariant"); 4637 assert(loader_data != NULL, "invariant"); 4638 4639 // Compute maximum size for transitive interfaces 4640 int max_transitive_size = 0; 4641 int super_size = 0; 4642 // Add superclass transitive interfaces size 4643 if (super != NULL) { 4644 super_size = super->transitive_interfaces()->length(); 4645 max_transitive_size += super_size; 4646 } 4647 // Add local interfaces' super interfaces 4648 const int local_size = local_ifs->length(); 4649 for (int i = 0; i < local_size; i++) { 4650 InstanceKlass* const l = local_ifs->at(i); 4651 max_transitive_size += l->transitive_interfaces()->length(); 4652 } 4653 // Finally add local interfaces 4654 max_transitive_size += local_size; 4655 // Construct array 4656 if (max_transitive_size == 0) { 4657 // no interfaces, use canonicalized array 4658 return Universe::the_empty_instance_klass_array(); 4659 } else if (max_transitive_size == super_size) { 4660 // no new local interfaces added, share superklass' transitive interface array 4661 return super->transitive_interfaces(); 4662 } else if (max_transitive_size == local_size) { 4663 // only local interfaces added, share local interface array 4664 return local_ifs; 4665 } else { 4666 ResourceMark rm; 4667 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4668 4669 // Copy down from superclass 4670 if (super != NULL) { 4671 append_interfaces(result, super->transitive_interfaces()); 4672 } 4673 4674 // Copy down from local interfaces' superinterfaces 4675 for (int i = 0; i < local_size; i++) { 4676 InstanceKlass* const l = local_ifs->at(i); 4677 append_interfaces(result, l->transitive_interfaces()); 4678 } 4679 // Finally add local interfaces 4680 append_interfaces(result, local_ifs); 4681 4682 // length will be less than the max_transitive_size if duplicates were removed 4683 const int length = result->length(); 4684 assert(length <= max_transitive_size, "just checking"); 4685 Array<InstanceKlass*>* const new_result = 4686 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4687 for (int i = 0; i < length; i++) { 4688 InstanceKlass* const e = result->at(i); 4689 assert(e != NULL, "just checking"); 4690 new_result->at_put(i, e); 4691 } 4692 return new_result; 4693 } 4694 } 4695 4696 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4697 assert(this_klass != NULL, "invariant"); 4698 const Klass* const super = this_klass->super(); 4699 4700 if (super != NULL) { 4701 4702 // If the loader is not the boot loader then throw an exception if its 4703 // superclass is in package jdk.internal.reflect and its loader is not a 4704 // special reflection class loader 4705 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4706 assert(super->is_instance_klass(), "super is not instance klass"); 4707 PackageEntry* super_package = super->package(); 4708 if (super_package != NULL && 4709 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4710 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4711 ResourceMark rm(THREAD); 4712 Exceptions::fthrow( 4713 THREAD_AND_LOCATION, 4714 vmSymbols::java_lang_IllegalAccessError(), 4715 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4716 this_klass->external_name(), 4717 this_klass->class_loader_data()->loader_name_and_id(), 4718 super->external_name()); 4719 return; 4720 } 4721 } 4722 4723 Reflection::VerifyClassAccessResults vca_result = 4724 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4725 if (vca_result != Reflection::ACCESS_OK) { 4726 ResourceMark rm(THREAD); 4727 char* msg = Reflection::verify_class_access_msg(this_klass, 4728 InstanceKlass::cast(super), 4729 vca_result); 4730 if (msg == NULL) { 4731 bool same_module = (this_klass->module() == super->module()); 4732 Exceptions::fthrow( 4733 THREAD_AND_LOCATION, 4734 vmSymbols::java_lang_IllegalAccessError(), 4735 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4736 this_klass->external_name(), 4737 super->is_abstract() ? "abstract " : "", 4738 super->external_name(), 4739 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4740 (same_module) ? "" : "; ", 4741 (same_module) ? "" : super->class_in_module_of_loader()); 4742 } else { 4743 // Add additional message content. 4744 Exceptions::fthrow( 4745 THREAD_AND_LOCATION, 4746 vmSymbols::java_lang_IllegalAccessError(), 4747 "superclass access check failed: %s", 4748 msg); 4749 } 4750 } 4751 } 4752 } 4753 4754 4755 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4756 assert(this_klass != NULL, "invariant"); 4757 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4758 const int lng = local_interfaces->length(); 4759 for (int i = lng - 1; i >= 0; i--) { 4760 InstanceKlass* const k = local_interfaces->at(i); 4761 assert (k != NULL && k->is_interface(), "invalid interface"); 4762 Reflection::VerifyClassAccessResults vca_result = 4763 Reflection::verify_class_access(this_klass, k, false); 4764 if (vca_result != Reflection::ACCESS_OK) { 4765 ResourceMark rm(THREAD); 4766 char* msg = Reflection::verify_class_access_msg(this_klass, 4767 k, 4768 vca_result); 4769 if (msg == NULL) { 4770 bool same_module = (this_klass->module() == k->module()); 4771 Exceptions::fthrow( 4772 THREAD_AND_LOCATION, 4773 vmSymbols::java_lang_IllegalAccessError(), 4774 "class %s cannot access its superinterface %s (%s%s%s)", 4775 this_klass->external_name(), 4776 k->external_name(), 4777 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4778 (same_module) ? "" : "; ", 4779 (same_module) ? "" : k->class_in_module_of_loader()); 4780 } else { 4781 // Add additional message content. 4782 Exceptions::fthrow( 4783 THREAD_AND_LOCATION, 4784 vmSymbols::java_lang_IllegalAccessError(), 4785 "superinterface check failed: %s", 4786 msg); 4787 } 4788 } 4789 } 4790 } 4791 4792 4793 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4794 assert(this_klass != NULL, "invariant"); 4795 const Array<Method*>* const methods = this_klass->methods(); 4796 const int num_methods = methods->length(); 4797 4798 // go thru each method and check if it overrides a final method 4799 for (int index = 0; index < num_methods; index++) { 4800 const Method* const m = methods->at(index); 4801 4802 // skip private, static, and <init> methods 4803 if ((!m->is_private() && !m->is_static()) && 4804 (m->name() != vmSymbols::object_initializer_name())) { 4805 4806 const Symbol* const name = m->name(); 4807 const Symbol* const signature = m->signature(); 4808 const Klass* k = this_klass->super(); 4809 const Method* super_m = NULL; 4810 while (k != NULL) { 4811 // skip supers that don't have final methods. 4812 if (k->has_final_method()) { 4813 // lookup a matching method in the super class hierarchy 4814 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4815 if (super_m == NULL) { 4816 break; // didn't find any match; get out 4817 } 4818 4819 if (super_m->is_final() && !super_m->is_static() && 4820 !super_m->access_flags().is_private()) { 4821 // matching method in super is final, and not static or private 4822 bool can_access = Reflection::verify_member_access(this_klass, 4823 super_m->method_holder(), 4824 super_m->method_holder(), 4825 super_m->access_flags(), 4826 false, false, CHECK); 4827 if (can_access) { 4828 // this class can access super final method and therefore override 4829 ResourceMark rm(THREAD); 4830 Exceptions::fthrow(THREAD_AND_LOCATION, 4831 vmSymbols::java_lang_VerifyError(), 4832 "class %s overrides final method %s.%s%s", 4833 this_klass->external_name(), 4834 super_m->method_holder()->external_name(), 4835 name->as_C_string(), 4836 signature->as_C_string() 4837 ); 4838 return; 4839 } 4840 } 4841 4842 // continue to look from super_m's holder's super. 4843 k = super_m->method_holder()->super(); 4844 continue; 4845 } 4846 4847 k = k->super(); 4848 } 4849 } 4850 } 4851 } 4852 4853 4854 // assumes that this_klass is an interface 4855 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4856 assert(this_klass != NULL, "invariant"); 4857 assert(this_klass->is_interface(), "not an interface"); 4858 const Array<Method*>* methods = this_klass->methods(); 4859 const int num_methods = methods->length(); 4860 4861 for (int index = 0; index < num_methods; index++) { 4862 const Method* const m = methods->at(index); 4863 // if m is static and not the init method, throw a verify error 4864 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4865 ResourceMark rm(THREAD); 4866 Exceptions::fthrow( 4867 THREAD_AND_LOCATION, 4868 vmSymbols::java_lang_VerifyError(), 4869 "Illegal static method %s in interface %s", 4870 m->name()->as_C_string(), 4871 this_klass->external_name() 4872 ); 4873 return; 4874 } 4875 } 4876 } 4877 4878 // utility methods for format checking 4879 4880 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4881 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4882 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4883 if (is_module) { 4884 ResourceMark rm(THREAD); 4885 Exceptions::fthrow( 4886 THREAD_AND_LOCATION, 4887 vmSymbols::java_lang_NoClassDefFoundError(), 4888 "%s is not a class because access_flag ACC_MODULE is set", 4889 _class_name->as_C_string()); 4890 return; 4891 } 4892 4893 if (!_need_verify) { return; } 4894 4895 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4896 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4897 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4898 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4899 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4900 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4901 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4902 const bool major_gte_14 = _major_version >= JAVA_14_VERSION; 4903 4904 if ((is_abstract && is_final) || 4905 (is_interface && !is_abstract) || 4906 (is_interface && major_gte_1_5 && (is_super || is_enum)) || 4907 (!is_interface && major_gte_1_5 && is_annotation)) { 4908 ResourceMark rm(THREAD); 4909 Exceptions::fthrow( 4910 THREAD_AND_LOCATION, 4911 vmSymbols::java_lang_ClassFormatError(), 4912 "Illegal class modifiers in class %s: 0x%X", 4913 _class_name->as_C_string(), flags 4914 ); 4915 return; 4916 } 4917 } 4918 4919 static bool has_illegal_visibility(jint flags) { 4920 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4921 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4922 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4923 4924 return ((is_public && is_protected) || 4925 (is_public && is_private) || 4926 (is_protected && is_private)); 4927 } 4928 4929 // A legal major_version.minor_version must be one of the following: 4930 // 4931 // Major_version >= 45 and major_version < 56, any minor_version. 4932 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. 4933 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. 4934 // 4935 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4936 ResourceMark rm(THREAD); 4937 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4938 if (major < JAVA_MIN_SUPPORTED_VERSION) { 4939 Exceptions::fthrow( 4940 THREAD_AND_LOCATION, 4941 vmSymbols::java_lang_UnsupportedClassVersionError(), 4942 "%s (class file version %u.%u) was compiled with an invalid major version", 4943 class_name->as_C_string(), major, minor); 4944 return; 4945 } 4946 4947 if (major > max_version) { 4948 Exceptions::fthrow( 4949 THREAD_AND_LOCATION, 4950 vmSymbols::java_lang_UnsupportedClassVersionError(), 4951 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4952 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4953 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4954 return; 4955 } 4956 4957 if (major < JAVA_12_VERSION || minor == 0) { 4958 return; 4959 } 4960 4961 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4962 if (major != max_version) { 4963 Exceptions::fthrow( 4964 THREAD_AND_LOCATION, 4965 vmSymbols::java_lang_UnsupportedClassVersionError(), 4966 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4967 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4968 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4969 return; 4970 } 4971 4972 if (!Arguments::enable_preview()) { 4973 Exceptions::fthrow( 4974 THREAD_AND_LOCATION, 4975 vmSymbols::java_lang_UnsupportedClassVersionError(), 4976 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4977 class_name->as_C_string(), major, minor); 4978 return; 4979 } 4980 4981 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4982 Exceptions::fthrow( 4983 THREAD_AND_LOCATION, 4984 vmSymbols::java_lang_UnsupportedClassVersionError(), 4985 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4986 class_name->as_C_string(), major, minor); 4987 } 4988 } 4989 4990 void ClassFileParser::verify_legal_field_modifiers(jint flags, 4991 bool is_interface, 4992 TRAPS) const { 4993 if (!_need_verify) { return; } 4994 4995 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4996 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4997 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4998 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4999 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5000 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 5001 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 5002 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 5003 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 5004 5005 bool is_illegal = false; 5006 5007 if (is_interface) { 5008 if (!is_public || !is_static || !is_final || is_private || 5009 is_protected || is_volatile || is_transient || 5010 (major_gte_1_5 && is_enum)) { 5011 is_illegal = true; 5012 } 5013 } else { // not interface 5014 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 5015 is_illegal = true; 5016 } 5017 } 5018 5019 if (is_illegal) { 5020 ResourceMark rm(THREAD); 5021 Exceptions::fthrow( 5022 THREAD_AND_LOCATION, 5023 vmSymbols::java_lang_ClassFormatError(), 5024 "Illegal field modifiers in class %s: 0x%X", 5025 _class_name->as_C_string(), flags); 5026 return; 5027 } 5028 } 5029 5030 void ClassFileParser::verify_legal_method_modifiers(jint flags, 5031 bool is_interface, 5032 const Symbol* name, 5033 TRAPS) const { 5034 if (!_need_verify) { return; } 5035 5036 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 5037 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 5038 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 5039 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5040 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 5041 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 5042 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 5043 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 5044 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 5045 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 5046 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 5047 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 5048 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 5049 5050 bool is_illegal = false; 5051 5052 if (is_interface) { 5053 if (major_gte_8) { 5054 // Class file version is JAVA_8_VERSION or later Methods of 5055 // interfaces may set any of the flags except ACC_PROTECTED, 5056 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 5057 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 5058 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 5059 (is_native || is_protected || is_final || is_synchronized) || 5060 // If a specific method of a class or interface has its 5061 // ACC_ABSTRACT flag set, it must not have any of its 5062 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 5063 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 5064 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 5065 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 5066 (is_abstract && (is_private || is_static || is_strict))) { 5067 is_illegal = true; 5068 } 5069 } else if (major_gte_1_5) { 5070 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 5071 if (!is_public || is_private || is_protected || is_static || is_final || 5072 is_synchronized || is_native || !is_abstract || is_strict) { 5073 is_illegal = true; 5074 } 5075 } else { 5076 // Class file version is pre-JAVA_1_5_VERSION 5077 if (!is_public || is_static || is_final || is_native || !is_abstract) { 5078 is_illegal = true; 5079 } 5080 } 5081 } else { // not interface 5082 if (has_illegal_visibility(flags)) { 5083 is_illegal = true; 5084 } else { 5085 if (is_initializer) { 5086 if (is_static || is_final || is_synchronized || is_native || 5087 is_abstract || (major_gte_1_5 && is_bridge)) { 5088 is_illegal = true; 5089 } 5090 } else { // not initializer 5091 if (is_abstract) { 5092 if ((is_final || is_native || is_private || is_static || 5093 (major_gte_1_5 && (is_synchronized || is_strict)))) { 5094 is_illegal = true; 5095 } 5096 } 5097 } 5098 } 5099 } 5100 5101 if (is_illegal) { 5102 ResourceMark rm(THREAD); 5103 Exceptions::fthrow( 5104 THREAD_AND_LOCATION, 5105 vmSymbols::java_lang_ClassFormatError(), 5106 "Method %s in class %s has illegal modifiers: 0x%X", 5107 name->as_C_string(), _class_name->as_C_string(), flags); 5108 return; 5109 } 5110 } 5111 5112 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 5113 int length, 5114 TRAPS) const { 5115 assert(_need_verify, "only called when _need_verify is true"); 5116 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 5117 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5118 } 5119 } 5120 5121 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5122 // In class names, '/' separates unqualified names. This is verified in this function also. 5123 // Method names also may not contain the characters '<' or '>', unless <init> 5124 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5125 // method. Because these names have been checked as special cases before 5126 // calling this method in verify_legal_method_name. 5127 // 5128 // This method is also called from the modular system APIs in modules.cpp 5129 // to verify the validity of module and package names. 5130 bool ClassFileParser::verify_unqualified_name(const char* name, 5131 unsigned int length, 5132 int type) { 5133 if (length == 0) return false; // Must have at least one char. 5134 for (const char* p = name; p != name + length; p++) { 5135 switch(*p) { 5136 case JVM_SIGNATURE_DOT: 5137 case JVM_SIGNATURE_ENDCLASS: 5138 case JVM_SIGNATURE_ARRAY: 5139 // do not permit '.', ';', or '[' 5140 return false; 5141 case JVM_SIGNATURE_SLASH: 5142 // check for '//' or leading or trailing '/' which are not legal 5143 // unqualified name must not be empty 5144 if (type == ClassFileParser::LegalClass) { 5145 if (p == name || p+1 >= name+length || 5146 *(p+1) == JVM_SIGNATURE_SLASH) { 5147 return false; 5148 } 5149 } else { 5150 return false; // do not permit '/' unless it's class name 5151 } 5152 break; 5153 case JVM_SIGNATURE_SPECIAL: 5154 case JVM_SIGNATURE_ENDSPECIAL: 5155 // do not permit '<' or '>' in method names 5156 if (type == ClassFileParser::LegalMethod) { 5157 return false; 5158 } 5159 } 5160 } 5161 return true; 5162 } 5163 5164 // Take pointer to a UTF8 byte string (not NUL-terminated). 5165 // Skip over the longest part of the string that could 5166 // be taken as a fieldname. Allow '/' if slash_ok is true. 5167 // Return a pointer to just past the fieldname. 5168 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5169 // being true, we saw consecutive slashes (meaning we were looking for a 5170 // qualified path but found something that was badly-formed). 5171 static const char* skip_over_field_name(const char* const name, 5172 bool slash_ok, 5173 unsigned int length) { 5174 const char* p; 5175 jboolean last_is_slash = false; 5176 jboolean not_first_ch = false; 5177 5178 for (p = name; p != name + length; not_first_ch = true) { 5179 const char* old_p = p; 5180 jchar ch = *p; 5181 if (ch < 128) { 5182 p++; 5183 // quick check for ascii 5184 if ((ch >= 'a' && ch <= 'z') || 5185 (ch >= 'A' && ch <= 'Z') || 5186 (ch == '_' || ch == '$') || 5187 (not_first_ch && ch >= '0' && ch <= '9')) { 5188 last_is_slash = false; 5189 continue; 5190 } 5191 if (slash_ok && ch == JVM_SIGNATURE_SLASH) { 5192 if (last_is_slash) { 5193 return NULL; // Don't permit consecutive slashes 5194 } 5195 last_is_slash = true; 5196 continue; 5197 } 5198 } 5199 else { 5200 jint unicode_ch; 5201 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5202 p = tmp_p; 5203 last_is_slash = false; 5204 // Check if ch is Java identifier start or is Java identifier part 5205 // 4672820: call java.lang.Character methods directly without generating separate tables. 5206 EXCEPTION_MARK; 5207 // return value 5208 JavaValue result(T_BOOLEAN); 5209 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 5210 JavaCallArguments args; 5211 args.push_int(unicode_ch); 5212 5213 if (not_first_ch) { 5214 // public static boolean isJavaIdentifierPart(char ch); 5215 JavaCalls::call_static(&result, 5216 SystemDictionary::Character_klass(), 5217 vmSymbols::isJavaIdentifierPart_name(), 5218 vmSymbols::int_bool_signature(), 5219 &args, 5220 THREAD); 5221 } else { 5222 // public static boolean isJavaIdentifierStart(char ch); 5223 JavaCalls::call_static(&result, 5224 SystemDictionary::Character_klass(), 5225 vmSymbols::isJavaIdentifierStart_name(), 5226 vmSymbols::int_bool_signature(), 5227 &args, 5228 THREAD); 5229 } 5230 if (HAS_PENDING_EXCEPTION) { 5231 CLEAR_PENDING_EXCEPTION; 5232 return NULL; 5233 } 5234 if(result.get_jboolean()) { 5235 continue; 5236 } 5237 } 5238 return (not_first_ch) ? old_p : NULL; 5239 } 5240 return (not_first_ch) ? p : NULL; 5241 } 5242 5243 // Take pointer to a UTF8 byte string (not NUL-terminated). 5244 // Skip over the longest part of the string that could 5245 // be taken as a field signature. Allow "void" if void_ok. 5246 // Return a pointer to just past the signature. 5247 // Return NULL if no legal signature is found. 5248 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5249 bool void_ok, 5250 unsigned int length, 5251 TRAPS) const { 5252 unsigned int array_dim = 0; 5253 while (length > 0) { 5254 switch (signature[0]) { 5255 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5256 case JVM_SIGNATURE_BOOLEAN: 5257 case JVM_SIGNATURE_BYTE: 5258 case JVM_SIGNATURE_CHAR: 5259 case JVM_SIGNATURE_SHORT: 5260 case JVM_SIGNATURE_INT: 5261 case JVM_SIGNATURE_FLOAT: 5262 case JVM_SIGNATURE_LONG: 5263 case JVM_SIGNATURE_DOUBLE: 5264 return signature + 1; 5265 case JVM_SIGNATURE_CLASS: { 5266 if (_major_version < JAVA_1_5_VERSION) { 5267 // Skip over the class name if one is there 5268 const char* const p = skip_over_field_name(signature + 1, true, --length); 5269 5270 // The next character better be a semicolon 5271 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) { 5272 return p + 1; 5273 } 5274 } 5275 else { 5276 // Skip leading 'L' and ignore first appearance of ';' 5277 signature++; 5278 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); 5279 // Format check signature 5280 if (c != NULL) { 5281 int newlen = c - (char*) signature; 5282 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 5283 if (!legal) { 5284 classfile_parse_error("Class name is empty or contains illegal character " 5285 "in descriptor in class file %s", 5286 CHECK_NULL); 5287 return NULL; 5288 } 5289 return signature + newlen + 1; 5290 } 5291 } 5292 return NULL; 5293 } 5294 case JVM_SIGNATURE_ARRAY: 5295 array_dim++; 5296 if (array_dim > 255) { 5297 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5298 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_NULL); 5299 } 5300 // The rest of what's there better be a legal signature 5301 signature++; 5302 length--; 5303 void_ok = false; 5304 break; 5305 default: 5306 return NULL; 5307 } 5308 } 5309 return NULL; 5310 } 5311 5312 // Checks if name is a legal class name. 5313 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5314 if (!_need_verify || _relax_verify) { return; } 5315 5316 assert(name->refcount() > 0, "symbol must be kept alive"); 5317 char* bytes = (char*)name->bytes(); 5318 unsigned int length = name->utf8_length(); 5319 bool legal = false; 5320 5321 if (length > 0) { 5322 const char* p; 5323 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5324 p = skip_over_field_signature(bytes, false, length, CHECK); 5325 legal = (p != NULL) && ((p - bytes) == (int)length); 5326 } else if (_major_version < JAVA_1_5_VERSION) { 5327 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5328 p = skip_over_field_name(bytes, true, length); 5329 legal = (p != NULL) && ((p - bytes) == (int)length); 5330 } 5331 } else { 5332 // 4900761: relax the constraints based on JSR202 spec 5333 // Class names may be drawn from the entire Unicode character set. 5334 // Identifiers between '/' must be unqualified names. 5335 // The utf8 string has been verified when parsing cpool entries. 5336 legal = verify_unqualified_name(bytes, length, LegalClass); 5337 } 5338 } 5339 if (!legal) { 5340 ResourceMark rm(THREAD); 5341 assert(_class_name != NULL, "invariant"); 5342 Exceptions::fthrow( 5343 THREAD_AND_LOCATION, 5344 vmSymbols::java_lang_ClassFormatError(), 5345 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5346 _class_name->as_C_string() 5347 ); 5348 return; 5349 } 5350 } 5351 5352 // Checks if name is a legal field name. 5353 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5354 if (!_need_verify || _relax_verify) { return; } 5355 5356 char* bytes = (char*)name->bytes(); 5357 unsigned int length = name->utf8_length(); 5358 bool legal = false; 5359 5360 if (length > 0) { 5361 if (_major_version < JAVA_1_5_VERSION) { 5362 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5363 const char* p = skip_over_field_name(bytes, false, length); 5364 legal = (p != NULL) && ((p - bytes) == (int)length); 5365 } 5366 } else { 5367 // 4881221: relax the constraints based on JSR202 spec 5368 legal = verify_unqualified_name(bytes, length, LegalField); 5369 } 5370 } 5371 5372 if (!legal) { 5373 ResourceMark rm(THREAD); 5374 assert(_class_name != NULL, "invariant"); 5375 Exceptions::fthrow( 5376 THREAD_AND_LOCATION, 5377 vmSymbols::java_lang_ClassFormatError(), 5378 "Illegal field name \"%.*s\" in class %s", length, bytes, 5379 _class_name->as_C_string() 5380 ); 5381 return; 5382 } 5383 } 5384 5385 // Checks if name is a legal method name. 5386 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5387 if (!_need_verify || _relax_verify) { return; } 5388 5389 assert(name != NULL, "method name is null"); 5390 char* bytes = (char*)name->bytes(); 5391 unsigned int length = name->utf8_length(); 5392 bool legal = false; 5393 5394 if (length > 0) { 5395 if (bytes[0] == JVM_SIGNATURE_SPECIAL) { 5396 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5397 legal = true; 5398 } 5399 } else if (_major_version < JAVA_1_5_VERSION) { 5400 const char* p; 5401 p = skip_over_field_name(bytes, false, length); 5402 legal = (p != NULL) && ((p - bytes) == (int)length); 5403 } else { 5404 // 4881221: relax the constraints based on JSR202 spec 5405 legal = verify_unqualified_name(bytes, length, LegalMethod); 5406 } 5407 } 5408 5409 if (!legal) { 5410 ResourceMark rm(THREAD); 5411 assert(_class_name != NULL, "invariant"); 5412 Exceptions::fthrow( 5413 THREAD_AND_LOCATION, 5414 vmSymbols::java_lang_ClassFormatError(), 5415 "Illegal method name \"%.*s\" in class %s", length, bytes, 5416 _class_name->as_C_string() 5417 ); 5418 return; 5419 } 5420 } 5421 5422 5423 // Checks if signature is a legal field signature. 5424 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5425 const Symbol* signature, 5426 TRAPS) const { 5427 if (!_need_verify) { return; } 5428 5429 const char* const bytes = (const char* const)signature->bytes(); 5430 const unsigned int length = signature->utf8_length(); 5431 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5432 5433 if (p == NULL || (p - bytes) != (int)length) { 5434 throwIllegalSignature("Field", name, signature, CHECK); 5435 } 5436 } 5437 5438 // Checks if signature is a legal method signature. 5439 // Returns number of parameters 5440 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5441 const Symbol* signature, 5442 TRAPS) const { 5443 if (!_need_verify) { 5444 // make sure caller's args_size will be less than 0 even for non-static 5445 // method so it will be recomputed in compute_size_of_parameters(). 5446 return -2; 5447 } 5448 5449 // Class initializers cannot have args for class format version >= 51. 5450 if (name == vmSymbols::class_initializer_name() && 5451 signature != vmSymbols::void_method_signature() && 5452 _major_version >= JAVA_7_VERSION) { 5453 throwIllegalSignature("Method", name, signature, CHECK_0); 5454 return 0; 5455 } 5456 5457 unsigned int args_size = 0; 5458 const char* p = (const char*)signature->bytes(); 5459 unsigned int length = signature->utf8_length(); 5460 const char* nextp; 5461 5462 // The first character must be a '(' 5463 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5464 length--; 5465 // Skip over legal field signatures 5466 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5467 while ((length > 0) && (nextp != NULL)) { 5468 args_size++; 5469 if (p[0] == 'J' || p[0] == 'D') { 5470 args_size++; 5471 } 5472 length -= nextp - p; 5473 p = nextp; 5474 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5475 } 5476 // The first non-signature thing better be a ')' 5477 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5478 length--; 5479 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) { 5480 // All internal methods must return void 5481 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5482 return args_size; 5483 } 5484 } else { 5485 // Now we better just have a return value 5486 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5487 if (nextp && ((int)length == (nextp - p))) { 5488 return args_size; 5489 } 5490 } 5491 } 5492 } 5493 // Report error 5494 throwIllegalSignature("Method", name, signature, CHECK_0); 5495 return 0; 5496 } 5497 5498 int ClassFileParser::static_field_size() const { 5499 assert(_field_info != NULL, "invariant"); 5500 return _field_info->_static_field_size; 5501 } 5502 5503 int ClassFileParser::total_oop_map_count() const { 5504 assert(_field_info != NULL, "invariant"); 5505 return _field_info->oop_map_blocks->_nonstatic_oop_map_count; 5506 } 5507 5508 jint ClassFileParser::layout_size() const { 5509 assert(_field_info != NULL, "invariant"); 5510 return _field_info->_instance_size; 5511 } 5512 5513 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5514 const Array<Method*>* methods) { 5515 assert(ik != NULL, "invariant"); 5516 assert(methods != NULL, "invariant"); 5517 5518 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5519 // (We used to do this lazily, but now we query it in Rewriter, 5520 // which is eagerly done for every method, so we might as well do it now, 5521 // when everything is fresh in memory.) 5522 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5523 5524 if (klass_id != vmSymbols::NO_SID) { 5525 for (int j = 0; j < methods->length(); ++j) { 5526 Method* method = methods->at(j); 5527 method->init_intrinsic_id(); 5528 5529 if (CheckIntrinsics) { 5530 // Check if an intrinsic is defined for method 'method', 5531 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5532 if (method->intrinsic_id() != vmIntrinsics::_none && 5533 !method->intrinsic_candidate()) { 5534 tty->print("Compiler intrinsic is defined for method [%s], " 5535 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5536 method->name_and_sig_as_C_string(), 5537 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5538 ); 5539 tty->cr(); 5540 DEBUG_ONLY(vm_exit(1)); 5541 } 5542 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5543 // but there is no intrinsic available for it. 5544 if (method->intrinsic_candidate() && 5545 method->intrinsic_id() == vmIntrinsics::_none) { 5546 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5547 "but no compiler intrinsic is defined for the method.%s", 5548 method->name_and_sig_as_C_string(), 5549 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5550 ); 5551 tty->cr(); 5552 DEBUG_ONLY(vm_exit(1)); 5553 } 5554 } 5555 } // end for 5556 5557 #ifdef ASSERT 5558 if (CheckIntrinsics) { 5559 // Check for orphan methods in the current class. A method m 5560 // of a class C is orphan if an intrinsic is defined for method m, 5561 // but class C does not declare m. 5562 // The check is potentially expensive, therefore it is available 5563 // only in debug builds. 5564 5565 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5566 if (vmIntrinsics::_compiledLambdaForm == id) { 5567 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5568 // generated for the JVM from a LambdaForm and therefore no method 5569 // is defined for it. 5570 continue; 5571 } 5572 5573 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5574 // Check if the current class contains a method with the same 5575 // name, flags, signature. 5576 bool match = false; 5577 for (int j = 0; j < methods->length(); ++j) { 5578 const Method* method = methods->at(j); 5579 if (method->intrinsic_id() == id) { 5580 match = true; 5581 break; 5582 } 5583 } 5584 5585 if (!match) { 5586 char buf[1000]; 5587 tty->print("Compiler intrinsic is defined for method [%s], " 5588 "but the method is not available in class [%s].%s", 5589 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5590 buf, sizeof(buf)), 5591 ik->name()->as_C_string(), 5592 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5593 ); 5594 tty->cr(); 5595 DEBUG_ONLY(vm_exit(1)); 5596 } 5597 } 5598 } // end for 5599 } // CheckIntrinsics 5600 #endif // ASSERT 5601 } 5602 } 5603 5604 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, 5605 const ClassInstanceInfo& cl_inst_info, 5606 TRAPS) { 5607 if (_klass != NULL) { 5608 return _klass; 5609 } 5610 5611 InstanceKlass* const ik = 5612 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5613 5614 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL); 5615 5616 assert(_klass == ik, "invariant"); 5617 5618 5619 if (ik->should_store_fingerprint()) { 5620 ik->store_fingerprint(_stream->compute_fingerprint()); 5621 } 5622 5623 ik->set_has_passed_fingerprint_check(false); 5624 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5625 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5626 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint(); 5627 if (aot_fp != 0 && aot_fp == fp) { 5628 // This class matches with a class saved in an AOT library 5629 ik->set_has_passed_fingerprint_check(true); 5630 } else { 5631 ResourceMark rm; 5632 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5633 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5634 } 5635 } 5636 5637 return ik; 5638 } 5639 5640 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, 5641 bool changed_by_loadhook, 5642 const ClassInstanceInfo& cl_inst_info, 5643 TRAPS) { 5644 assert(ik != NULL, "invariant"); 5645 5646 // Set name and CLD before adding to CLD 5647 ik->set_class_loader_data(_loader_data); 5648 ik->set_name(_class_name); 5649 5650 // Add all classes to our internal class loader list here, 5651 // including classes in the bootstrap (NULL) class loader. 5652 const bool publicize = !is_internal(); 5653 5654 _loader_data->add_class(ik, publicize); 5655 5656 set_klass_to_deallocate(ik); 5657 5658 assert(_field_info != NULL, "invariant"); 5659 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity"); 5660 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count, 5661 "sanity"); 5662 5663 assert(ik->is_instance_klass(), "sanity"); 5664 assert(ik->size_helper() == _field_info->_instance_size, "sanity"); 5665 5666 // Fill in information already parsed 5667 ik->set_should_verify_class(_need_verify); 5668 5669 // Not yet: supers are done below to support the new subtype-checking fields 5670 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size); 5671 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields); 5672 assert(_fac != NULL, "invariant"); 5673 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]); 5674 5675 // this transfers ownership of a lot of arrays from 5676 // the parser onto the InstanceKlass* 5677 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5678 5679 // can only set dynamic nest-host after static nest information is set 5680 if (cl_inst_info.dynamic_nest_host() != NULL) { 5681 ik->set_nest_host(cl_inst_info.dynamic_nest_host(), CHECK); 5682 } 5683 5684 // note that is not safe to use the fields in the parser from this point on 5685 assert(NULL == _cp, "invariant"); 5686 assert(NULL == _fields, "invariant"); 5687 assert(NULL == _methods, "invariant"); 5688 assert(NULL == _inner_classes, "invariant"); 5689 assert(NULL == _nest_members, "invariant"); 5690 assert(NULL == _local_interfaces, "invariant"); 5691 assert(NULL == _combined_annotations, "invariant"); 5692 assert(NULL == _record_components, "invariant"); 5693 5694 if (_has_final_method) { 5695 ik->set_has_final_method(); 5696 } 5697 5698 ik->copy_method_ordering(_method_ordering, CHECK); 5699 // The InstanceKlass::_methods_jmethod_ids cache 5700 // is managed on the assumption that the initial cache 5701 // size is equal to the number of methods in the class. If 5702 // that changes, then InstanceKlass::idnum_can_increment() 5703 // has to be changed accordingly. 5704 ik->set_initial_method_idnum(ik->methods()->length()); 5705 5706 ik->set_this_class_index(_this_class_index); 5707 5708 if (_is_hidden || is_unsafe_anonymous()) { 5709 // _this_class_index is a CONSTANT_Class entry that refers to this 5710 // hidden or anonymous class itself. If this class needs to refer to its own 5711 // methods or fields, it would use a CONSTANT_MethodRef, etc, which would reference 5712 // _this_class_index. However, because this class is hidden or anonymous (it's 5713 // not stored in SystemDictionary), _this_class_index cannot be resolved 5714 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5715 // Therefore, we must eagerly resolve _this_class_index now. 5716 ik->constants()->klass_at_put(_this_class_index, ik); 5717 } 5718 5719 ik->set_minor_version(_minor_version); 5720 ik->set_major_version(_major_version); 5721 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5722 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5723 5724 if (_unsafe_anonymous_host != NULL) { 5725 assert (ik->is_unsafe_anonymous(), "should be the same"); 5726 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host); 5727 } 5728 if (_is_hidden) { 5729 ik->set_is_hidden(); 5730 } 5731 5732 // Set PackageEntry for this_klass 5733 oop cl = ik->class_loader(); 5734 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5735 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5736 ik->set_package(cld, CHECK); 5737 // Obtain this_klass' module entry 5738 ModuleEntry* module_entry = ik->module(); 5739 assert(module_entry != NULL, "module_entry should always be set"); 5740 5741 5742 const Array<Method*>* const methods = ik->methods(); 5743 assert(methods != NULL, "invariant"); 5744 const int methods_len = methods->length(); 5745 5746 check_methods_for_intrinsics(ik, methods); 5747 5748 // Fill in field values obtained by parse_classfile_attributes 5749 if (_parsed_annotations->has_any_annotations()) { 5750 _parsed_annotations->apply_to(ik); 5751 } 5752 5753 apply_parsed_class_attributes(ik); 5754 5755 // Miranda methods 5756 if ((_num_miranda_methods > 0) || 5757 // if this class introduced new miranda methods or 5758 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5759 // super class exists and this class inherited miranda methods 5760 ) { 5761 ik->set_has_miranda_methods(); // then set a flag 5762 } 5763 5764 // Fill in information needed to compute superclasses. 5765 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5766 ik->set_transitive_interfaces(_transitive_interfaces); 5767 _transitive_interfaces = NULL; 5768 5769 // Initialize itable offset tables 5770 klassItable::setup_itable_offset_table(ik); 5771 5772 // Compute transitive closure of interfaces this class implements 5773 // Do final class setup 5774 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks; 5775 if (oop_map_blocks->_nonstatic_oop_map_count > 0) { 5776 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); 5777 } 5778 5779 if (_has_contended_fields || _parsed_annotations->is_contended() || 5780 ( _super_klass != NULL && _super_klass->has_contended_annotations())) { 5781 ik->set_has_contended_annotations(true); 5782 } 5783 5784 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5785 set_precomputed_flags(ik); 5786 5787 // check if this class can access its super class 5788 check_super_class_access(ik, CHECK); 5789 5790 // check if this class can access its superinterfaces 5791 check_super_interface_access(ik, CHECK); 5792 5793 // check if this class overrides any final method 5794 check_final_method_override(ik, CHECK); 5795 5796 // reject static interface methods prior to Java 8 5797 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5798 check_illegal_static_method(ik, CHECK); 5799 } 5800 5801 // Obtain java.lang.Module 5802 Handle module_handle(THREAD, module_entry->module()); 5803 5804 // Allocate mirror and initialize static fields 5805 // The create_mirror() call will also call compute_modifiers() 5806 java_lang_Class::create_mirror(ik, 5807 Handle(THREAD, _loader_data->class_loader()), 5808 module_handle, 5809 _protection_domain, 5810 cl_inst_info.class_data(), 5811 CHECK); 5812 5813 assert(_all_mirandas != NULL, "invariant"); 5814 5815 // Generate any default methods - default methods are public interface methods 5816 // that have a default implementation. This is new with Java 8. 5817 if (_has_nonstatic_concrete_methods) { 5818 DefaultMethods::generate_default_methods(ik, 5819 _all_mirandas, 5820 CHECK); 5821 } 5822 5823 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5824 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5825 !module_entry->has_default_read_edges()) { 5826 if (!module_entry->set_has_default_read_edges()) { 5827 // We won a potential race 5828 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5829 } 5830 } 5831 5832 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5833 5834 if (!is_internal()) { 5835 if (log_is_enabled(Info, class, load)) { 5836 ResourceMark rm; 5837 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5838 ik->print_class_load_logging(_loader_data, module_name, _stream); 5839 } 5840 5841 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5842 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && 5843 log_is_enabled(Info, class, preview)) { 5844 ResourceMark rm; 5845 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5846 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); 5847 } 5848 5849 if (log_is_enabled(Debug, class, resolve)) { 5850 ResourceMark rm; 5851 // print out the superclass. 5852 const char * from = ik->external_name(); 5853 if (ik->java_super() != NULL) { 5854 log_debug(class, resolve)("%s %s (super)", 5855 from, 5856 ik->java_super()->external_name()); 5857 } 5858 // print out each of the interface classes referred to by this class. 5859 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5860 if (local_interfaces != NULL) { 5861 const int length = local_interfaces->length(); 5862 for (int i = 0; i < length; i++) { 5863 const InstanceKlass* const k = local_interfaces->at(i); 5864 const char * to = k->external_name(); 5865 log_debug(class, resolve)("%s %s (interface)", from, to); 5866 } 5867 } 5868 } 5869 } 5870 5871 JFR_ONLY(INIT_ID(ik);) 5872 5873 // If we reach here, all is well. 5874 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5875 // in order for it to not be destroyed in the ClassFileParser destructor. 5876 set_klass_to_deallocate(NULL); 5877 5878 // it's official 5879 set_klass(ik); 5880 5881 debug_only(ik->verify();) 5882 } 5883 5884 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's 5885 // package by prepending its host class's package name to its class name and setting 5886 // its _class_name field. 5887 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) { 5888 ResourceMark rm(THREAD); 5889 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL, 5890 "Unsafe anonymous class should not be in a package"); 5891 const char* host_pkg_name = 5892 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL); 5893 5894 if (host_pkg_name != NULL) { 5895 int host_pkg_len = (int)strlen(host_pkg_name); 5896 int class_name_len = _class_name->utf8_length(); 5897 int symbol_len = host_pkg_len + 1 + class_name_len; 5898 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1); 5899 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s", 5900 host_pkg_name, class_name_len, _class_name->base()); 5901 assert(n == symbol_len, "Unexpected number of characters in string"); 5902 5903 // Decrement old _class_name to avoid leaking. 5904 _class_name->decrement_refcount(); 5905 5906 // Create a symbol and update the anonymous class name. 5907 // The new class name is created with a refcount of one. When installed into the InstanceKlass, 5908 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted 5909 // when the class is unloaded. 5910 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len); 5911 } 5912 } 5913 5914 // If the host class and the anonymous class are in the same package then do 5915 // nothing. If the anonymous class is in the unnamed package then move it to its 5916 // host's package. If the classes are in different packages then throw an IAE 5917 // exception. 5918 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) { 5919 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class"); 5920 5921 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(), 5922 _class_name->utf8_length(), JVM_SIGNATURE_SLASH); 5923 if (anon_last_slash == NULL) { // Unnamed package 5924 prepend_host_package_name(_unsafe_anonymous_host, CHECK); 5925 } else { 5926 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) { 5927 ResourceMark rm(THREAD); 5928 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5929 err_msg("Host class %s and anonymous class %s are in different packages", 5930 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string())); 5931 } 5932 } 5933 } 5934 5935 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5936 bool trusted = loader_data->is_boot_class_loader_data() || 5937 loader_data->is_platform_class_loader_data(); 5938 bool need_verify = 5939 // verifyAll 5940 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5941 // verifyRemote 5942 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5943 return !need_verify; 5944 } 5945 5946 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5947 Symbol* name, 5948 ClassLoaderData* loader_data, 5949 Handle protection_domain, 5950 const InstanceKlass* unsafe_anonymous_host, 5951 GrowableArray<Handle>* cp_patches, 5952 const bool is_hidden, 5953 const bool can_access_vm_annotations, 5954 Publicity pub_level, 5955 TRAPS) : 5956 _stream(stream), 5957 _class_name(NULL), 5958 _loader_data(loader_data), 5959 _unsafe_anonymous_host(unsafe_anonymous_host), 5960 _cp_patches(cp_patches), 5961 _is_hidden(is_hidden), 5962 _can_access_vm_annotations(can_access_vm_annotations), 5963 _num_patched_klasses(0), 5964 _max_num_patched_klasses(0), 5965 _orig_cp_size(0), 5966 _first_patched_klass_resolved_index(0), 5967 _super_klass(), 5968 _cp(NULL), 5969 _fields(NULL), 5970 _methods(NULL), 5971 _inner_classes(NULL), 5972 _nest_members(NULL), 5973 _nest_host(0), 5974 _record_components(NULL), 5975 _local_interfaces(NULL), 5976 _transitive_interfaces(NULL), 5977 _combined_annotations(NULL), 5978 _class_annotations(NULL), 5979 _class_type_annotations(NULL), 5980 _fields_annotations(NULL), 5981 _fields_type_annotations(NULL), 5982 _klass(NULL), 5983 _klass_to_deallocate(NULL), 5984 _parsed_annotations(NULL), 5985 _fac(NULL), 5986 _field_info(NULL), 5987 _method_ordering(NULL), 5988 _all_mirandas(NULL), 5989 _vtable_size(0), 5990 _itable_size(0), 5991 _num_miranda_methods(0), 5992 _rt(REF_NONE), 5993 _protection_domain(protection_domain), 5994 _access_flags(), 5995 _pub_level(pub_level), 5996 _bad_constant_seen(0), 5997 _synthetic_flag(false), 5998 _sde_length(false), 5999 _sde_buffer(NULL), 6000 _sourcefile_index(0), 6001 _generic_signature_index(0), 6002 _major_version(0), 6003 _minor_version(0), 6004 _this_class_index(0), 6005 _super_class_index(0), 6006 _itfs_len(0), 6007 _java_fields_count(0), 6008 _need_verify(false), 6009 _relax_verify(false), 6010 _has_nonstatic_concrete_methods(false), 6011 _declares_nonstatic_concrete_methods(false), 6012 _has_final_method(false), 6013 _has_contended_fields(false), 6014 _has_finalizer(false), 6015 _has_empty_finalizer(false), 6016 _has_vanilla_constructor(false), 6017 _max_bootstrap_specifier_index(-1) { 6018 6019 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 6020 _class_name->increment_refcount(); 6021 6022 assert(THREAD->is_Java_thread(), "invariant"); 6023 assert(_loader_data != NULL, "invariant"); 6024 assert(stream != NULL, "invariant"); 6025 assert(_stream != NULL, "invariant"); 6026 assert(_stream->buffer() == _stream->current(), "invariant"); 6027 assert(_class_name != NULL, "invariant"); 6028 assert(0 == _access_flags.as_int(), "invariant"); 6029 6030 // Figure out whether we can skip format checking (matching classic VM behavior) 6031 if (DumpSharedSpaces) { 6032 // verify == true means it's a 'remote' class (i.e., non-boot class) 6033 // Verification decision is based on BytecodeVerificationRemote flag 6034 // for those classes. 6035 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 6036 BytecodeVerificationLocal; 6037 } 6038 else { 6039 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 6040 stream->need_verify()); 6041 } 6042 if (_cp_patches != NULL) { 6043 int len = _cp_patches->length(); 6044 for (int i=0; i<len; i++) { 6045 if (has_cp_patch_at(i)) { 6046 Handle patch = cp_patch_at(i); 6047 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 6048 // We need to append the names of the patched classes to the end of the constant pool, 6049 // because a patched class may have a Utf8 name that's not already included in the 6050 // original constant pool. These class names are used when patch_constant_pool() 6051 // calls patch_class(). 6052 // 6053 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 6054 // At this point, we don't know the tag for index i yet, because we haven't parsed the 6055 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 6056 _max_num_patched_klasses++; 6057 } 6058 } 6059 } 6060 } 6061 6062 // synch back verification state to stream 6063 stream->set_verify(_need_verify); 6064 6065 // Check if verification needs to be relaxed for this class file 6066 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 6067 _relax_verify = relax_format_check_for(_loader_data); 6068 6069 parse_stream(stream, CHECK); 6070 6071 post_process_parsed_stream(stream, _cp, CHECK); 6072 } 6073 6074 void ClassFileParser::clear_class_metadata() { 6075 // metadata created before the instance klass is created. Must be 6076 // deallocated if classfile parsing returns an error. 6077 _cp = NULL; 6078 _fields = NULL; 6079 _methods = NULL; 6080 _inner_classes = NULL; 6081 _nest_members = NULL; 6082 _local_interfaces = NULL; 6083 _combined_annotations = NULL; 6084 _class_annotations = _class_type_annotations = NULL; 6085 _fields_annotations = _fields_type_annotations = NULL; 6086 _record_components = NULL; 6087 } 6088 6089 // Destructor to clean up 6090 ClassFileParser::~ClassFileParser() { 6091 _class_name->decrement_refcount(); 6092 6093 if (_cp != NULL) { 6094 MetadataFactory::free_metadata(_loader_data, _cp); 6095 } 6096 if (_fields != NULL) { 6097 MetadataFactory::free_array<u2>(_loader_data, _fields); 6098 } 6099 6100 if (_methods != NULL) { 6101 // Free methods 6102 InstanceKlass::deallocate_methods(_loader_data, _methods); 6103 } 6104 6105 // beware of the Universe::empty_blah_array!! 6106 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 6107 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 6108 } 6109 6110 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) { 6111 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 6112 } 6113 6114 if (_record_components != NULL) { 6115 InstanceKlass::deallocate_record_components(_loader_data, _record_components); 6116 } 6117 6118 // Free interfaces 6119 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 6120 _local_interfaces, _transitive_interfaces); 6121 6122 if (_combined_annotations != NULL) { 6123 // After all annotations arrays have been created, they are installed into the 6124 // Annotations object that will be assigned to the InstanceKlass being created. 6125 6126 // Deallocate the Annotations object and the installed annotations arrays. 6127 _combined_annotations->deallocate_contents(_loader_data); 6128 6129 // If the _combined_annotations pointer is non-NULL, 6130 // then the other annotations fields should have been cleared. 6131 assert(_class_annotations == NULL, "Should have been cleared"); 6132 assert(_class_type_annotations == NULL, "Should have been cleared"); 6133 assert(_fields_annotations == NULL, "Should have been cleared"); 6134 assert(_fields_type_annotations == NULL, "Should have been cleared"); 6135 } else { 6136 // If the annotations arrays were not installed into the Annotations object, 6137 // then they have to be deallocated explicitly. 6138 MetadataFactory::free_array<u1>(_loader_data, _class_annotations); 6139 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations); 6140 Annotations::free_contents(_loader_data, _fields_annotations); 6141 Annotations::free_contents(_loader_data, _fields_type_annotations); 6142 } 6143 6144 clear_class_metadata(); 6145 _transitive_interfaces = NULL; 6146 6147 // deallocate the klass if already created. Don't directly deallocate, but add 6148 // to the deallocate list so that the klass is removed from the CLD::_klasses list 6149 // at a safepoint. 6150 if (_klass_to_deallocate != NULL) { 6151 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 6152 } 6153 } 6154 6155 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 6156 TRAPS) { 6157 6158 assert(stream != NULL, "invariant"); 6159 assert(_class_name != NULL, "invariant"); 6160 6161 // BEGIN STREAM PARSING 6162 stream->guarantee_more(8, CHECK); // magic, major, minor 6163 // Magic value 6164 const u4 magic = stream->get_u4_fast(); 6165 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 6166 "Incompatible magic value %u in class file %s", 6167 magic, CHECK); 6168 6169 // Version numbers 6170 _minor_version = stream->get_u2_fast(); 6171 _major_version = stream->get_u2_fast(); 6172 6173 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) { 6174 ResourceMark rm; 6175 warning("Pre JDK 6 class not supported by CDS: %u.%u %s", 6176 _major_version, _minor_version, _class_name->as_C_string()); 6177 Exceptions::fthrow( 6178 THREAD_AND_LOCATION, 6179 vmSymbols::java_lang_UnsupportedClassVersionError(), 6180 "Unsupported major.minor version for dump time %u.%u", 6181 _major_version, 6182 _minor_version); 6183 } 6184 6185 // Check version numbers - we check this even with verifier off 6186 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 6187 6188 stream->guarantee_more(3, CHECK); // length, first cp tag 6189 u2 cp_size = stream->get_u2_fast(); 6190 6191 guarantee_property( 6192 cp_size >= 1, "Illegal constant pool size %u in class file %s", 6193 cp_size, CHECK); 6194 6195 _orig_cp_size = cp_size; 6196 if (is_hidden()) { // Add a slot for hidden class name. 6197 assert(_max_num_patched_klasses == 0, "Sanity check"); 6198 cp_size++; 6199 } else { 6200 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 6201 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 6202 } 6203 cp_size += _max_num_patched_klasses; 6204 } 6205 6206 _cp = ConstantPool::allocate(_loader_data, 6207 cp_size, 6208 CHECK); 6209 6210 ConstantPool* const cp = _cp; 6211 6212 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6213 6214 assert(cp_size == (const u2)cp->length(), "invariant"); 6215 6216 // ACCESS FLAGS 6217 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6218 6219 // Access flags 6220 jint flags; 6221 // JVM_ACC_MODULE is defined in JDK-9 and later. 6222 if (_major_version >= JAVA_9_VERSION) { 6223 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 6224 } else { 6225 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 6226 } 6227 6228 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6229 // Set abstract bit for old class files for backward compatibility 6230 flags |= JVM_ACC_ABSTRACT; 6231 } 6232 6233 verify_legal_class_modifiers(flags, CHECK); 6234 6235 short bad_constant = class_bad_constant_seen(); 6236 if (bad_constant != 0) { 6237 // Do not throw CFE until after the access_flags are checked because if 6238 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6239 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 6240 } 6241 6242 _access_flags.set_flags(flags); 6243 6244 // This class and superclass 6245 _this_class_index = stream->get_u2_fast(); 6246 check_property( 6247 valid_cp_range(_this_class_index, cp_size) && 6248 cp->tag_at(_this_class_index).is_unresolved_klass(), 6249 "Invalid this class index %u in constant pool in class file %s", 6250 _this_class_index, CHECK); 6251 6252 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6253 assert(class_name_in_cp != NULL, "class_name can't be null"); 6254 6255 // Don't need to check whether this class name is legal or not. 6256 // It has been checked when constant pool is parsed. 6257 // However, make sure it is not an array type. 6258 if (_need_verify) { 6259 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY, 6260 "Bad class name in class file %s", 6261 CHECK); 6262 } 6263 6264 #ifdef ASSERT 6265 // Basic sanity checks 6266 assert(!(_is_hidden && (_unsafe_anonymous_host != NULL)), "mutually exclusive variants"); 6267 6268 if (_unsafe_anonymous_host != NULL) { 6269 assert(_class_name == vmSymbols::unknown_class_name(), "A named anonymous class???"); 6270 } 6271 if (_is_hidden) { 6272 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name"); 6273 } 6274 #endif 6275 6276 // Update the _class_name as needed depending on whether this is a named, 6277 // un-named, hidden or unsafe-anonymous class. 6278 6279 if (_is_hidden) { 6280 ResourceMark rm(THREAD); 6281 assert(_class_name != NULL, "Unexpected null _class_name"); 6282 #ifdef ASSERT 6283 if (_need_verify) { 6284 verify_legal_class_name(_class_name, CHECK); 6285 } 6286 #endif 6287 6288 // Construct hidden name from _class_name, "+", and &_cp. Note that we can't 6289 // use a '/' because that confuses finding the class's package. Also, can't 6290 // use an illegal char such as ';' because that causes serialization issues 6291 // and issues with hidden classes that create their own hidden classes. 6292 char addr_buf[20]; 6293 jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(_cp)); 6294 size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf); 6295 char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len); 6296 jio_snprintf(new_name, new_name_len, "%s+%s", 6297 _class_name->as_C_string(), addr_buf); 6298 _class_name->decrement_refcount(); 6299 _class_name = SymbolTable::new_symbol(new_name); 6300 _class_name->increment_refcount(); 6301 6302 // Add a Utf8 entry containing the hidden name. 6303 assert(_class_name != NULL, "Unexpected null _class_name"); 6304 int hidden_index = _orig_cp_size; // this is an extra slot we added 6305 cp->symbol_at_put(hidden_index, _class_name); 6306 6307 // Update this_class_index's slot in the constant pool with the new Utf8 entry. 6308 // We have to update the resolved_klass_index and the name_index together 6309 // so extract the existing resolved_klass_index first. 6310 CPKlassSlot cp_klass_slot = cp->klass_slot_at(_this_class_index); 6311 int resolved_klass_index = cp_klass_slot.resolved_klass_index(); 6312 cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index); 6313 assert(cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size, 6314 "Bad name_index"); 6315 6316 // NOTE: !_is_hidden does not imply "findable" as it could be an old-style 6317 // "hidden" unsafe-anonymous class 6318 6319 // If this is an anonymous class fix up its name if it is in the unnamed 6320 // package. Otherwise, throw IAE if it is in a different package than 6321 // its host class. 6322 } else if (_unsafe_anonymous_host != NULL) { 6323 Symbol* old_class_name = _class_name; 6324 _class_name = class_name_in_cp; 6325 _class_name->increment_refcount(); 6326 fix_unsafe_anonymous_class_name(CHECK); 6327 old_class_name->decrement_refcount(); 6328 6329 } else { 6330 // Check if name in class file matches given name 6331 if (_class_name != class_name_in_cp) { 6332 if (_class_name != vmSymbols::unknown_class_name()) { 6333 ResourceMark rm(THREAD); 6334 Exceptions::fthrow(THREAD_AND_LOCATION, 6335 vmSymbols::java_lang_NoClassDefFoundError(), 6336 "%s (wrong name: %s)", 6337 class_name_in_cp->as_C_string(), 6338 _class_name->as_C_string() 6339 ); 6340 return; 6341 } else { 6342 // The class name was not known by the caller so we set it from 6343 // the value in the CP. 6344 _class_name = class_name_in_cp; 6345 _class_name->increment_refcount(); 6346 } 6347 // else nothing to do: the expected class name matches what is in the CP 6348 } 6349 } 6350 6351 // Verification prevents us from creating names with dots in them, this 6352 // asserts that that's the case. 6353 assert(is_internal_format(_class_name), "external class name format used internally"); 6354 6355 if (!is_internal()) { 6356 LogTarget(Debug, class, preorder) lt; 6357 if (lt.is_enabled()){ 6358 ResourceMark rm(THREAD); 6359 LogStream ls(lt); 6360 ls.print("%s", _class_name->as_klass_external_name()); 6361 if (stream->source() != NULL) { 6362 ls.print(" source: %s", stream->source()); 6363 } 6364 ls.cr(); 6365 } 6366 6367 #if INCLUDE_CDS 6368 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6369 if (!ClassLoader::has_jrt_entry()) { 6370 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6371 DumpLoadedClassList = NULL; 6372 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6373 !_is_hidden && 6374 _unsafe_anonymous_host == NULL) { 6375 // Only dump the classes that can be stored into CDS archive. 6376 // Hidden and unsafe anonymous classes such as generated LambdaForm classes are also not included. 6377 oop class_loader = _loader_data->class_loader(); 6378 ResourceMark rm(THREAD); 6379 bool skip = false; 6380 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6381 // For the boot and platform class loaders, skip classes that are not found in the 6382 // java runtime image, such as those found in the --patch-module entries. 6383 // These classes can't be loaded from the archive during runtime. 6384 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) { 6385 skip = true; 6386 } 6387 6388 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6389 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6390 // as they can be loaded from the archive during runtime. 6391 skip = false; 6392 } 6393 } 6394 if (skip) { 6395 tty->print_cr("skip writing class %s from source %s to classlist file", 6396 _class_name->as_C_string(), stream->source()); 6397 } else { 6398 classlist_file->print_cr("%s", _class_name->as_C_string()); 6399 classlist_file->flush(); 6400 } 6401 } 6402 } 6403 #endif 6404 } 6405 6406 // SUPERKLASS 6407 _super_class_index = stream->get_u2_fast(); 6408 _super_klass = parse_super_class(cp, 6409 _super_class_index, 6410 _need_verify, 6411 CHECK); 6412 6413 // Interfaces 6414 _itfs_len = stream->get_u2_fast(); 6415 parse_interfaces(stream, 6416 _itfs_len, 6417 cp, 6418 &_has_nonstatic_concrete_methods, 6419 CHECK); 6420 6421 assert(_local_interfaces != NULL, "invariant"); 6422 6423 // Fields (offsets are filled in later) 6424 _fac = new FieldAllocationCount(); 6425 parse_fields(stream, 6426 _access_flags.is_interface(), 6427 _fac, 6428 cp, 6429 cp_size, 6430 &_java_fields_count, 6431 CHECK); 6432 6433 assert(_fields != NULL, "invariant"); 6434 6435 // Methods 6436 AccessFlags promoted_flags; 6437 parse_methods(stream, 6438 _access_flags.is_interface(), 6439 &promoted_flags, 6440 &_has_final_method, 6441 &_declares_nonstatic_concrete_methods, 6442 CHECK); 6443 6444 assert(_methods != NULL, "invariant"); 6445 6446 // promote flags from parse_methods() to the klass' flags 6447 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6448 6449 if (_declares_nonstatic_concrete_methods) { 6450 _has_nonstatic_concrete_methods = true; 6451 } 6452 6453 // Additional attributes/annotations 6454 _parsed_annotations = new ClassAnnotationCollector(); 6455 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6456 6457 assert(_inner_classes != NULL, "invariant"); 6458 6459 // Finalize the Annotations metadata object, 6460 // now that all annotation arrays have been created. 6461 create_combined_annotations(CHECK); 6462 6463 // Make sure this is the end of class file stream 6464 guarantee_property(stream->at_eos(), 6465 "Extra bytes at the end of class file %s", 6466 CHECK); 6467 6468 // all bytes in stream read and parsed 6469 } 6470 6471 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6472 ConstantPool* cp, 6473 TRAPS) { 6474 assert(stream != NULL, "invariant"); 6475 assert(stream->at_eos(), "invariant"); 6476 assert(cp != NULL, "invariant"); 6477 assert(_loader_data != NULL, "invariant"); 6478 6479 if (_class_name == vmSymbols::java_lang_Object()) { 6480 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6481 "java.lang.Object cannot implement an interface in class file %s", 6482 CHECK); 6483 } 6484 // We check super class after class file is parsed and format is checked 6485 if (_super_class_index > 0 && NULL ==_super_klass) { 6486 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6487 if (_access_flags.is_interface()) { 6488 // Before attempting to resolve the superclass, check for class format 6489 // errors not checked yet. 6490 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6491 "Interfaces must have java.lang.Object as superclass in class file %s", 6492 CHECK); 6493 } 6494 Handle loader(THREAD, _loader_data->class_loader()); 6495 _super_klass = (const InstanceKlass*) 6496 SystemDictionary::resolve_super_or_fail(_class_name, 6497 super_class_name, 6498 loader, 6499 _protection_domain, 6500 true, 6501 CHECK); 6502 } 6503 6504 if (_super_klass != NULL) { 6505 if (_super_klass->has_nonstatic_concrete_methods()) { 6506 _has_nonstatic_concrete_methods = true; 6507 } 6508 6509 if (_super_klass->is_interface()) { 6510 ResourceMark rm(THREAD); 6511 Exceptions::fthrow( 6512 THREAD_AND_LOCATION, 6513 vmSymbols::java_lang_IncompatibleClassChangeError(), 6514 "class %s has interface %s as super class", 6515 _class_name->as_klass_external_name(), 6516 _super_klass->external_name() 6517 ); 6518 return; 6519 } 6520 // Make sure super class is not final 6521 if (_super_klass->is_final()) { 6522 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6523 } 6524 } 6525 6526 // Compute the transitive list of all unique interfaces implemented by this class 6527 _transitive_interfaces = 6528 compute_transitive_interfaces(_super_klass, 6529 _local_interfaces, 6530 _loader_data, 6531 CHECK); 6532 6533 assert(_transitive_interfaces != NULL, "invariant"); 6534 6535 // sort methods 6536 _method_ordering = sort_methods(_methods); 6537 6538 _all_mirandas = new GrowableArray<Method*>(20); 6539 6540 Handle loader(THREAD, _loader_data->class_loader()); 6541 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6542 &_num_miranda_methods, 6543 _all_mirandas, 6544 _super_klass, 6545 _methods, 6546 _access_flags, 6547 _major_version, 6548 loader, 6549 _class_name, 6550 _local_interfaces, 6551 CHECK); 6552 6553 // Size of Java itable (in words) 6554 _itable_size = _access_flags.is_interface() ? 0 : 6555 klassItable::compute_itable_size(_transitive_interfaces); 6556 6557 assert(_fac != NULL, "invariant"); 6558 assert(_parsed_annotations != NULL, "invariant"); 6559 6560 _field_info = new FieldLayoutInfo(); 6561 if (UseNewFieldLayout) { 6562 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields, 6563 _parsed_annotations->is_contended(), _field_info); 6564 lb.build_layout(); 6565 } else { 6566 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6567 } 6568 6569 // Compute reference typ 6570 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6571 6572 } 6573 6574 void ClassFileParser::set_klass(InstanceKlass* klass) { 6575 6576 #ifdef ASSERT 6577 if (klass != NULL) { 6578 assert(NULL == _klass, "leaking?"); 6579 } 6580 #endif 6581 6582 _klass = klass; 6583 } 6584 6585 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6586 6587 #ifdef ASSERT 6588 if (klass != NULL) { 6589 assert(NULL == _klass_to_deallocate, "leaking?"); 6590 } 6591 #endif 6592 6593 _klass_to_deallocate = klass; 6594 } 6595 6596 // Caller responsible for ResourceMark 6597 // clone stream with rewound position 6598 const ClassFileStream* ClassFileParser::clone_stream() const { 6599 assert(_stream != NULL, "invariant"); 6600 6601 return _stream->clone(); 6602 } 6603 // ---------------------------------------------------------------------------- 6604 // debugging 6605 6606 #ifdef ASSERT 6607 6608 // return true if class_name contains no '.' (internal format is '/') 6609 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6610 if (class_name != NULL) { 6611 ResourceMark rm; 6612 char* name = class_name->as_C_string(); 6613 return strchr(name, JVM_SIGNATURE_DOT) == NULL; 6614 } else { 6615 return true; 6616 } 6617 } 6618 6619 #endif