1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 #include "precompiled.hpp" 25 #include "jvm.h" 26 #include "aot/aotLoader.hpp" 27 #include "classfile/classFileParser.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/defaultMethods.hpp" 32 #include "classfile/dictionary.hpp" 33 #include "classfile/javaClasses.inline.hpp" 34 #include "classfile/moduleEntry.hpp" 35 #include "classfile/symbolTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/verificationType.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "gc/shared/gcLocker.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.hpp" 44 #include "memory/metadataFactory.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "memory/universe.inline.hpp" 48 #include "oops/annotations.hpp" 49 #include "oops/fieldStreams.hpp" 50 #include "oops/instanceKlass.hpp" 51 #include "oops/instanceMirrorKlass.hpp" 52 #include "oops/klass.inline.hpp" 53 #include "oops/klassVtable.hpp" 54 #include "oops/metadata.hpp" 55 #include "oops/method.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/symbol.hpp" 58 #include "oops/valueKlass.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "runtime/javaCalls.hpp" 62 #include "runtime/perfData.hpp" 63 #include "runtime/reflection.hpp" 64 #include "runtime/signature.hpp" 65 #include "runtime/timer.hpp" 66 #include "services/classLoadingService.hpp" 67 #include "services/threadService.hpp" 68 #include "trace/traceMacros.hpp" 69 #include "utilities/align.hpp" 70 #include "utilities/bitMap.inline.hpp" 71 #include "utilities/exceptions.hpp" 72 #include "utilities/globalDefinitions.hpp" 73 #include "utilities/growableArray.hpp" 74 #include "utilities/macros.hpp" 75 #include "utilities/ostream.hpp" 76 #include "utilities/resourceHash.hpp" 77 #if INCLUDE_CDS 78 #include "classfile/systemDictionaryShared.hpp" 79 #endif 80 81 // We generally try to create the oops directly when parsing, rather than 82 // allocating temporary data structures and copying the bytes twice. A 83 // temporary area is only needed when parsing utf8 entries in the constant 84 // pool and when parsing line number tables. 85 86 // We add assert in debug mode when class format is not checked. 87 88 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 89 #define JAVA_MIN_SUPPORTED_VERSION 45 90 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 1 91 92 // Used for two backward compatibility reasons: 93 // - to check for new additions to the class file format in JDK1.5 94 // - to check for bug fixes in the format checker in JDK1.5 95 #define JAVA_1_5_VERSION 49 96 97 // Used for backward compatibility reasons: 98 // - to check for javac bug fixes that happened after 1.5 99 // - also used as the max version when running in jdk6 100 #define JAVA_6_VERSION 50 101 102 // Used for backward compatibility reasons: 103 // - to disallow argument and require ACC_STATIC for <clinit> methods 104 #define JAVA_7_VERSION 51 105 106 // Extension method support. 107 #define JAVA_8_VERSION 52 108 109 #define JAVA_9_VERSION 53 110 111 #define JAVA_10_VERSION 54 112 113 #define JAVA_11_VERSION 55 114 115 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 116 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION, 117 "Unexpected bad constant pool entry"); 118 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 119 } 120 121 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 122 ConstantPool* cp, 123 const int length, 124 TRAPS) { 125 assert(stream != NULL, "invariant"); 126 assert(cp != NULL, "invariant"); 127 128 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 129 // this function (_current can be allocated in a register, with scalar 130 // replacement of aggregates). The _current pointer is copied back to 131 // stream() when this function returns. DON'T call another method within 132 // this method that uses stream(). 133 const ClassFileStream cfs1 = *stream; 134 const ClassFileStream* const cfs = &cfs1; 135 136 assert(cfs->allocated_on_stack(), "should be local"); 137 debug_only(const u1* const old_current = stream->current();) 138 139 // Used for batching symbol allocations. 140 const char* names[SymbolTable::symbol_alloc_batch_size]; 141 int lengths[SymbolTable::symbol_alloc_batch_size]; 142 int indices[SymbolTable::symbol_alloc_batch_size]; 143 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 144 int names_count = 0; 145 146 // parsing Index 0 is unused 147 for (int index = 1; index < length; index++) { 148 // Each of the following case guarantees one more byte in the stream 149 // for the following tag or the access_flags following constant pool, 150 // so we don't need bounds-check for reading tag. 151 const u1 tag = cfs->get_u1_fast(); 152 switch (tag) { 153 case JVM_CONSTANT_Class: { 154 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 155 const u2 name_index = cfs->get_u2_fast(); 156 cp->klass_index_at_put(index, name_index); 157 break; 158 } 159 case JVM_CONSTANT_Value: { // may be present in a retransform situation 160 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 161 const u2 name_index = cfs->get_u2_fast(); 162 cp->value_type_index_at_put(index, name_index); 163 break; 164 } 165 case JVM_CONSTANT_Fieldref: { 166 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 167 const u2 class_index = cfs->get_u2_fast(); 168 const u2 name_and_type_index = cfs->get_u2_fast(); 169 cp->field_at_put(index, class_index, name_and_type_index); 170 break; 171 } 172 case JVM_CONSTANT_Methodref: { 173 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 174 const u2 class_index = cfs->get_u2_fast(); 175 const u2 name_and_type_index = cfs->get_u2_fast(); 176 cp->method_at_put(index, class_index, name_and_type_index); 177 break; 178 } 179 case JVM_CONSTANT_InterfaceMethodref: { 180 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 181 const u2 class_index = cfs->get_u2_fast(); 182 const u2 name_and_type_index = cfs->get_u2_fast(); 183 cp->interface_method_at_put(index, class_index, name_and_type_index); 184 break; 185 } 186 case JVM_CONSTANT_String : { 187 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 188 const u2 string_index = cfs->get_u2_fast(); 189 cp->string_index_at_put(index, string_index); 190 break; 191 } 192 case JVM_CONSTANT_MethodHandle : 193 case JVM_CONSTANT_MethodType: { 194 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 195 classfile_parse_error( 196 "Class file version does not support constant tag %u in class file %s", 197 tag, CHECK); 198 } 199 if (tag == JVM_CONSTANT_MethodHandle) { 200 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 201 const u1 ref_kind = cfs->get_u1_fast(); 202 const u2 method_index = cfs->get_u2_fast(); 203 cp->method_handle_index_at_put(index, ref_kind, method_index); 204 } 205 else if (tag == JVM_CONSTANT_MethodType) { 206 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 207 const u2 signature_index = cfs->get_u2_fast(); 208 cp->method_type_index_at_put(index, signature_index); 209 } 210 else { 211 ShouldNotReachHere(); 212 } 213 break; 214 } 215 case JVM_CONSTANT_Dynamic : { 216 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 217 classfile_parse_error( 218 "Class file version does not support constant tag %u in class file %s", 219 tag, CHECK); 220 } 221 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 222 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 223 const u2 name_and_type_index = cfs->get_u2_fast(); 224 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 225 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 226 } 227 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 228 break; 229 } 230 case JVM_CONSTANT_InvokeDynamic : { 231 if (_major_version < Verifier::INVOKEDYNAMIC_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->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 243 break; 244 } 245 case JVM_CONSTANT_Integer: { 246 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 247 const u4 bytes = cfs->get_u4_fast(); 248 cp->int_at_put(index, (jint)bytes); 249 break; 250 } 251 case JVM_CONSTANT_Float: { 252 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 253 const u4 bytes = cfs->get_u4_fast(); 254 cp->float_at_put(index, *(jfloat*)&bytes); 255 break; 256 } 257 case JVM_CONSTANT_Long: { 258 // A mangled type might cause you to overrun allocated memory 259 guarantee_property(index + 1 < length, 260 "Invalid constant pool entry %u in class file %s", 261 index, 262 CHECK); 263 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 264 const u8 bytes = cfs->get_u8_fast(); 265 cp->long_at_put(index, bytes); 266 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 267 break; 268 } 269 case JVM_CONSTANT_Double: { 270 // A mangled type might cause you to overrun allocated memory 271 guarantee_property(index+1 < length, 272 "Invalid constant pool entry %u in class file %s", 273 index, 274 CHECK); 275 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 276 const u8 bytes = cfs->get_u8_fast(); 277 cp->double_at_put(index, *(jdouble*)&bytes); 278 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 279 break; 280 } 281 case JVM_CONSTANT_NameAndType: { 282 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 283 const u2 name_index = cfs->get_u2_fast(); 284 const u2 signature_index = cfs->get_u2_fast(); 285 cp->name_and_type_at_put(index, name_index, signature_index); 286 break; 287 } 288 case JVM_CONSTANT_Utf8 : { 289 cfs->guarantee_more(2, CHECK); // utf8_length 290 u2 utf8_length = cfs->get_u2_fast(); 291 const u1* utf8_buffer = cfs->current(); 292 assert(utf8_buffer != NULL, "null utf8 buffer"); 293 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 294 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 295 cfs->skip_u1_fast(utf8_length); 296 297 // Before storing the symbol, make sure it's legal 298 if (_need_verify) { 299 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 300 } 301 302 if (has_cp_patch_at(index)) { 303 Handle patch = clear_cp_patch_at(index); 304 guarantee_property(java_lang_String::is_instance(patch()), 305 "Illegal utf8 patch at %d in class file %s", 306 index, 307 CHECK); 308 const char* const str = java_lang_String::as_utf8_string(patch()); 309 // (could use java_lang_String::as_symbol instead, but might as well batch them) 310 utf8_buffer = (const u1*) str; 311 utf8_length = (int) strlen(str); 312 } 313 314 unsigned int hash; 315 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 316 utf8_length, 317 hash); 318 if (result == NULL) { 319 names[names_count] = (const char*)utf8_buffer; 320 lengths[names_count] = utf8_length; 321 indices[names_count] = index; 322 hashValues[names_count++] = hash; 323 if (names_count == SymbolTable::symbol_alloc_batch_size) { 324 SymbolTable::new_symbols(_loader_data, 325 cp, 326 names_count, 327 names, 328 lengths, 329 indices, 330 hashValues, 331 CHECK); 332 names_count = 0; 333 } 334 } else { 335 cp->symbol_at_put(index, result); 336 } 337 break; 338 } 339 case 19: 340 case 20: { 341 // Record that an error occurred in these two cases but keep parsing so 342 // that ACC_Module can be checked for in the access_flags. Need to 343 // throw NoClassDefFoundError in that case. 344 if (_major_version >= JAVA_9_VERSION) { 345 cfs->guarantee_more(3, CHECK); 346 cfs->get_u2_fast(); 347 set_class_bad_constant_seen(tag); 348 break; 349 } 350 } 351 default: { 352 classfile_parse_error("Unknown constant tag %u in class file %s", 353 tag, 354 CHECK); 355 break; 356 } 357 } // end of switch(tag) 358 } // end of for 359 360 // Allocate the remaining symbols 361 if (names_count > 0) { 362 SymbolTable::new_symbols(_loader_data, 363 cp, 364 names_count, 365 names, 366 lengths, 367 indices, 368 hashValues, 369 CHECK); 370 } 371 372 // Copy _current pointer of local copy back to stream. 373 assert(stream->current() == old_current, "non-exclusive use of stream"); 374 stream->set_current(cfs1.current()); 375 376 } 377 378 static inline bool valid_cp_range(int index, int length) { 379 return (index > 0 && index < length); 380 } 381 382 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 383 assert(cp != NULL, "invariant"); 384 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 385 return cp->symbol_at(index); 386 } 387 return NULL; 388 } 389 390 #ifdef ASSERT 391 PRAGMA_DIAG_PUSH 392 PRAGMA_FORMAT_NONLITERAL_IGNORED 393 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 394 ResourceMark rm(THREAD); 395 fatal(msg, _class_name->as_C_string()); 396 } 397 398 void ClassFileParser::report_assert_property_failure(const char* msg, 399 int index, 400 TRAPS) const { 401 ResourceMark rm(THREAD); 402 fatal(msg, index, _class_name->as_C_string()); 403 } 404 PRAGMA_DIAG_POP 405 #endif 406 407 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 408 ConstantPool* const cp, 409 const int length, 410 TRAPS) { 411 assert(cp != NULL, "invariant"); 412 assert(stream != NULL, "invariant"); 413 414 // parsing constant pool entries 415 parse_constant_pool_entries(stream, cp, length, CHECK); 416 if (class_bad_constant_seen() != 0) { 417 // a bad CP entry has been detected previously so stop parsing and just return. 418 return; 419 } 420 421 int index = 1; // declared outside of loops for portability 422 int num_klasses = 0; 423 424 // first verification pass - validate cross references 425 // and fixup class and string constants 426 for (index = 1; index < length; index++) { // Index 0 is unused 427 const jbyte tag = cp->tag_at(index).value(); 428 switch (tag) { 429 case JVM_CONSTANT_Class: 430 case JVM_CONSTANT_Value: { 431 ShouldNotReachHere(); // Only JVM_CONSTANT_[Class|Value]Index should be present 432 break; 433 } 434 case JVM_CONSTANT_Fieldref: 435 // fall through 436 case JVM_CONSTANT_Methodref: 437 // fall through 438 case JVM_CONSTANT_InterfaceMethodref: { 439 if (!_need_verify) break; 440 const int klass_ref_index = cp->klass_ref_index_at(index); 441 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 442 check_property(valid_klass_reference_at(klass_ref_index) || 443 (valid_value_type_reference_at(klass_ref_index) && 444 ((EnableMVT && (tag == JVM_CONSTANT_Fieldref)) || 445 EnableValhalla)), 446 "Invalid constant pool index %u in class file %s", 447 klass_ref_index, CHECK); 448 check_property(valid_cp_range(name_and_type_ref_index, length) && 449 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 450 "Invalid constant pool index %u in class file %s", 451 name_and_type_ref_index, CHECK); 452 break; 453 } 454 case JVM_CONSTANT_String: { 455 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 456 break; 457 } 458 case JVM_CONSTANT_Integer: 459 break; 460 case JVM_CONSTANT_Float: 461 break; 462 case JVM_CONSTANT_Long: 463 case JVM_CONSTANT_Double: { 464 index++; 465 check_property( 466 (index < length && cp->tag_at(index).is_invalid()), 467 "Improper constant pool long/double index %u in class file %s", 468 index, CHECK); 469 break; 470 } 471 case JVM_CONSTANT_NameAndType: { 472 if (!_need_verify) break; 473 const int name_ref_index = cp->name_ref_index_at(index); 474 const int signature_ref_index = cp->signature_ref_index_at(index); 475 check_property(valid_symbol_at(name_ref_index), 476 "Invalid constant pool index %u in class file %s", 477 name_ref_index, CHECK); 478 check_property(valid_symbol_at(signature_ref_index), 479 "Invalid constant pool index %u in class file %s", 480 signature_ref_index, CHECK); 481 break; 482 } 483 case JVM_CONSTANT_Utf8: 484 break; 485 case JVM_CONSTANT_UnresolvedClass: // fall-through 486 case JVM_CONSTANT_UnresolvedClassInError: { 487 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 488 break; 489 } 490 case JVM_CONSTANT_ClassIndex: { 491 const int class_index = cp->klass_index_at(index); 492 check_property(valid_symbol_at(class_index), 493 "Invalid constant pool index %u in class file %s", 494 class_index, CHECK); 495 496 Symbol* const name = cp->symbol_at(class_index); 497 const unsigned int name_len = name->utf8_length(); 498 499 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 500 break; 501 } 502 case JVM_CONSTANT_ValueIndex: { 503 const int class_index = cp->value_type_index_at(index); 504 check_property(valid_symbol_at(class_index), 505 "Invalid constant pool index %u in class file %s", 506 class_index, CHECK); 507 cp->unresolved_value_type_at_put(index, class_index, num_klasses++); 508 break; 509 } 510 case JVM_CONSTANT_StringIndex: { 511 const int string_index = cp->string_index_at(index); 512 check_property(valid_symbol_at(string_index), 513 "Invalid constant pool index %u in class file %s", 514 string_index, CHECK); 515 Symbol* const sym = cp->symbol_at(string_index); 516 cp->unresolved_string_at_put(index, sym); 517 break; 518 } 519 case JVM_CONSTANT_MethodHandle: { 520 const int ref_index = cp->method_handle_index_at(index); 521 check_property(valid_cp_range(ref_index, length), 522 "Invalid constant pool index %u in class file %s", 523 ref_index, CHECK); 524 const constantTag tag = cp->tag_at(ref_index); 525 const int ref_kind = cp->method_handle_ref_kind_at(index); 526 527 switch (ref_kind) { 528 case JVM_REF_getField: 529 case JVM_REF_getStatic: 530 case JVM_REF_putField: 531 case JVM_REF_putStatic: { 532 check_property( 533 tag.is_field(), 534 "Invalid constant pool index %u in class file %s (not a field)", 535 ref_index, CHECK); 536 break; 537 } 538 case JVM_REF_invokeVirtual: 539 case JVM_REF_newInvokeSpecial: { 540 check_property( 541 tag.is_method(), 542 "Invalid constant pool index %u in class file %s (not a method)", 543 ref_index, CHECK); 544 break; 545 } 546 case JVM_REF_invokeStatic: 547 case JVM_REF_invokeSpecial: { 548 check_property( 549 tag.is_method() || 550 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 551 "Invalid constant pool index %u in class file %s (not a method)", 552 ref_index, CHECK); 553 break; 554 } 555 case JVM_REF_invokeInterface: { 556 check_property( 557 tag.is_interface_method(), 558 "Invalid constant pool index %u in class file %s (not an interface method)", 559 ref_index, CHECK); 560 break; 561 } 562 default: { 563 classfile_parse_error( 564 "Bad method handle kind at constant pool index %u in class file %s", 565 index, CHECK); 566 } 567 } // switch(refkind) 568 // Keep the ref_index unchanged. It will be indirected at link-time. 569 break; 570 } // case MethodHandle 571 case JVM_CONSTANT_MethodType: { 572 const int ref_index = cp->method_type_index_at(index); 573 check_property(valid_symbol_at(ref_index), 574 "Invalid constant pool index %u in class file %s", 575 ref_index, CHECK); 576 break; 577 } 578 case JVM_CONSTANT_Dynamic: { 579 const int name_and_type_ref_index = 580 cp->invoke_dynamic_name_and_type_ref_index_at(index); 581 582 check_property(valid_cp_range(name_and_type_ref_index, length) && 583 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 584 "Invalid constant pool index %u in class file %s", 585 name_and_type_ref_index, CHECK); 586 // bootstrap specifier index must be checked later, 587 // when BootstrapMethods attr is available 588 589 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 590 cp->set_has_dynamic_constant(); 591 break; 592 } 593 case JVM_CONSTANT_InvokeDynamic: { 594 const int name_and_type_ref_index = 595 cp->invoke_dynamic_name_and_type_ref_index_at(index); 596 597 check_property(valid_cp_range(name_and_type_ref_index, length) && 598 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 599 "Invalid constant pool index %u in class file %s", 600 name_and_type_ref_index, CHECK); 601 // bootstrap specifier index must be checked later, 602 // when BootstrapMethods attr is available 603 break; 604 } 605 default: { 606 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 607 ShouldNotReachHere(); 608 break; 609 } 610 } // switch(tag) 611 } // end of for 612 613 _first_patched_klass_resolved_index = num_klasses; 614 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 615 616 if (_cp_patches != NULL) { 617 // need to treat this_class specially... 618 619 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 620 // for now. These will be replaced with actual names of the patched classes in patch_class(). 621 Symbol* s = vmSymbols::star_name(); 622 for (int n=_orig_cp_size; n<cp->length(); n++) { 623 cp->symbol_at_put(n, s); 624 } 625 626 int this_class_index; 627 { 628 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 629 const u1* const mark = stream->current(); 630 stream->skip_u2_fast(1); // skip flags 631 this_class_index = stream->get_u2_fast(); 632 stream->set_current(mark); // revert to mark 633 } 634 635 for (index = 1; index < length; index++) { // Index 0 is unused 636 if (has_cp_patch_at(index)) { 637 guarantee_property(index != this_class_index, 638 "Illegal constant pool patch to self at %d in class file %s", 639 index, CHECK); 640 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 641 } 642 } 643 } 644 645 if (!_need_verify) { 646 return; 647 } 648 649 // second verification pass - checks the strings are of the right format. 650 // but not yet to the other entries 651 for (index = 1; index < length; index++) { 652 const jbyte tag = cp->tag_at(index).value(); 653 switch (tag) { 654 case JVM_CONSTANT_UnresolvedClass: 655 case JVM_CONSTANT_UnresolvedValue: { 656 const Symbol* const class_name = cp->klass_name_at(index); 657 // check the name, even if _cp_patches will overwrite it 658 verify_legal_class_name(class_name, CHECK); 659 break; 660 } 661 case JVM_CONSTANT_NameAndType: { 662 if (_need_verify) { 663 const int sig_index = cp->signature_ref_index_at(index); 664 const int name_index = cp->name_ref_index_at(index); 665 const Symbol* const name = cp->symbol_at(name_index); 666 const Symbol* const sig = cp->symbol_at(sig_index); 667 guarantee_property(sig->utf8_length() != 0, 668 "Illegal zero length constant pool entry at %d in class %s", 669 sig_index, CHECK); 670 guarantee_property(name->utf8_length() != 0, 671 "Illegal zero length constant pool entry at %d in class %s", 672 name_index, CHECK); 673 674 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 675 // Format check method name and signature 676 verify_legal_method_name(name, CHECK); 677 verify_legal_method_signature(name, sig, CHECK); 678 } else { 679 // Format check field name and signature 680 verify_legal_field_name(name, CHECK); 681 verify_legal_field_signature(name, sig, CHECK); 682 } 683 } 684 break; 685 } 686 case JVM_CONSTANT_Dynamic: { 687 const int name_and_type_ref_index = 688 cp->name_and_type_ref_index_at(index); 689 // already verified to be utf8 690 const int name_ref_index = 691 cp->name_ref_index_at(name_and_type_ref_index); 692 // already verified to be utf8 693 const int signature_ref_index = 694 cp->signature_ref_index_at(name_and_type_ref_index); 695 const Symbol* const name = cp->symbol_at(name_ref_index); 696 const Symbol* const signature = cp->symbol_at(signature_ref_index); 697 if (_need_verify) { 698 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 699 // Need only to be sure signature is non-zero length and the right type. 700 if (signature->utf8_length() == 0 || 701 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 702 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 703 } 704 } 705 break; 706 } 707 case JVM_CONSTANT_InvokeDynamic: 708 case JVM_CONSTANT_Fieldref: 709 case JVM_CONSTANT_Methodref: 710 case JVM_CONSTANT_InterfaceMethodref: { 711 const int name_and_type_ref_index = 712 cp->name_and_type_ref_index_at(index); 713 // already verified to be utf8 714 const int name_ref_index = 715 cp->name_ref_index_at(name_and_type_ref_index); 716 // already verified to be utf8 717 const int signature_ref_index = 718 cp->signature_ref_index_at(name_and_type_ref_index); 719 const Symbol* const name = cp->symbol_at(name_ref_index); 720 const Symbol* const signature = cp->symbol_at(signature_ref_index); 721 if (tag == JVM_CONSTANT_Fieldref) { 722 if (_need_verify) { 723 // Field name and signature are verified above, when iterating NameAndType_info. 724 // Need only to be sure signature is non-zero length and the right type. 725 if (signature->utf8_length() == 0 || 726 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 727 throwIllegalSignature("Field", name, signature, CHECK); 728 } 729 } 730 } else { 731 if (_need_verify) { 732 // Method name and signature are verified above, when iterating NameAndType_info. 733 // Need only to be sure signature is non-zero length and the right type. 734 if (signature->utf8_length() == 0 || 735 signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 736 throwIllegalSignature("Method", name, signature, CHECK); 737 } 738 } 739 // 4509014: If a class method name begins with '<', it must be "<init>" 740 const unsigned int name_len = name->utf8_length(); 741 if (tag == JVM_CONSTANT_Methodref && 742 name_len != 0 && 743 name->byte_at(0) == '<' && 744 name != vmSymbols::object_initializer_name()) { 745 classfile_parse_error( 746 "Bad method name at constant pool index %u in class file %s", 747 name_ref_index, CHECK); 748 } 749 } 750 break; 751 } 752 case JVM_CONSTANT_MethodHandle: { 753 const int ref_index = cp->method_handle_index_at(index); 754 const int ref_kind = cp->method_handle_ref_kind_at(index); 755 switch (ref_kind) { 756 case JVM_REF_invokeVirtual: 757 case JVM_REF_invokeStatic: 758 case JVM_REF_invokeSpecial: 759 case JVM_REF_newInvokeSpecial: { 760 const int name_and_type_ref_index = 761 cp->name_and_type_ref_index_at(ref_index); 762 const int name_ref_index = 763 cp->name_ref_index_at(name_and_type_ref_index); 764 const Symbol* const name = cp->symbol_at(name_ref_index); 765 if (ref_kind == JVM_REF_newInvokeSpecial) { 766 if (name != vmSymbols::object_initializer_name()) { 767 classfile_parse_error( 768 "Bad constructor name at constant pool index %u in class file %s", 769 name_ref_index, CHECK); 770 } 771 } else { 772 if (name == vmSymbols::object_initializer_name()) { 773 classfile_parse_error( 774 "Bad method name at constant pool index %u in class file %s", 775 name_ref_index, CHECK); 776 } 777 } 778 break; 779 } 780 // Other ref_kinds are already fully checked in previous pass. 781 } // switch(ref_kind) 782 break; 783 } 784 case JVM_CONSTANT_MethodType: { 785 const Symbol* const no_name = vmSymbols::type_name(); // place holder 786 const Symbol* const signature = cp->method_type_signature_at(index); 787 verify_legal_method_signature(no_name, signature, CHECK); 788 break; 789 } 790 case JVM_CONSTANT_Utf8: { 791 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 792 } 793 } // switch(tag) 794 } // end of for 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(), CHECK); 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_klass_array(); 935 } else { 936 assert(itfs_len > 0, "only called for len>0"); 937 _local_interfaces = MetadataFactory::new_array<Klass*>(_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->byte_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 "Implementing class"); 970 } 971 972 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 973 *has_nonstatic_concrete_methods = true; 974 } 975 _local_interfaces->at_put(index, interf); 976 } 977 978 if (!_need_verify || itfs_len <= 1) { 979 return; 980 } 981 982 // Check if there's any duplicates in interfaces 983 ResourceMark rm(THREAD); 984 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 985 NameSigHash*, 986 HASH_ROW_SIZE); 987 initialize_hashtable(interface_names); 988 bool dup = false; 989 const Symbol* name = NULL; 990 { 991 debug_only(NoSafepointVerifier nsv;) 992 for (index = 0; index < itfs_len; index++) { 993 const Klass* const k = _local_interfaces->at(index); 994 name = InstanceKlass::cast(k)->name(); 995 // If no duplicates, add (name, NULL) in hashtable interface_names. 996 if (!put_after_lookup(name, NULL, interface_names)) { 997 dup = true; 998 break; 999 } 1000 } 1001 } 1002 if (dup) { 1003 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 1004 name->as_C_string(), CHECK); 1005 } 1006 } 1007 } 1008 1009 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1010 int constantvalue_index, 1011 int signature_index, 1012 TRAPS) const { 1013 // Make sure the constant pool entry is of a type appropriate to this field 1014 guarantee_property( 1015 (constantvalue_index > 0 && 1016 constantvalue_index < cp->length()), 1017 "Bad initial value index %u in ConstantValue attribute in class file %s", 1018 constantvalue_index, CHECK); 1019 1020 const constantTag value_type = cp->tag_at(constantvalue_index); 1021 switch(cp->basic_type_for_signature_at(signature_index)) { 1022 case T_LONG: { 1023 guarantee_property(value_type.is_long(), 1024 "Inconsistent constant value type in class file %s", 1025 CHECK); 1026 break; 1027 } 1028 case T_FLOAT: { 1029 guarantee_property(value_type.is_float(), 1030 "Inconsistent constant value type in class file %s", 1031 CHECK); 1032 break; 1033 } 1034 case T_DOUBLE: { 1035 guarantee_property(value_type.is_double(), 1036 "Inconsistent constant value type in class file %s", 1037 CHECK); 1038 break; 1039 } 1040 case T_BYTE: 1041 case T_CHAR: 1042 case T_SHORT: 1043 case T_BOOLEAN: 1044 case T_INT: { 1045 guarantee_property(value_type.is_int(), 1046 "Inconsistent constant value type in class file %s", 1047 CHECK); 1048 break; 1049 } 1050 case T_OBJECT: { 1051 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1052 && value_type.is_string()), 1053 "Bad string initial value in class file %s", 1054 CHECK); 1055 break; 1056 } 1057 default: { 1058 classfile_parse_error("Unable to set initial value %u in class file %s", 1059 constantvalue_index, 1060 CHECK); 1061 } 1062 } 1063 } 1064 1065 class AnnotationCollector : public ResourceObj{ 1066 public: 1067 enum Location { _in_field, _in_method, _in_class }; 1068 enum ID { 1069 _unknown = 0, 1070 _method_CallerSensitive, 1071 _method_ForceInline, 1072 _method_DontInline, 1073 _method_InjectedProfile, 1074 _method_LambdaForm_Compiled, 1075 _method_LambdaForm_Hidden, 1076 _method_HotSpotIntrinsicCandidate, 1077 _jdk_internal_vm_annotation_Contended, 1078 _field_Stable, 1079 _jdk_internal_vm_annotation_ReservedStackAccess, 1080 _annotation_LIMIT 1081 }; 1082 const Location _location; 1083 int _annotations_present; 1084 u2 _contended_group; 1085 1086 AnnotationCollector(Location location) 1087 : _location(location), _annotations_present(0) 1088 { 1089 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1090 } 1091 // If this annotation name has an ID, report it (or _none). 1092 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 1093 // Set the annotation name: 1094 void set_annotation(ID id) { 1095 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1096 _annotations_present |= nth_bit((int)id); 1097 } 1098 1099 void remove_annotation(ID id) { 1100 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1101 _annotations_present &= ~nth_bit((int)id); 1102 } 1103 1104 // Report if the annotation is present. 1105 bool has_any_annotations() const { return _annotations_present != 0; } 1106 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1107 1108 void set_contended_group(u2 group) { _contended_group = group; } 1109 u2 contended_group() const { return _contended_group; } 1110 1111 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1112 1113 void set_stable(bool stable) { set_annotation(_field_Stable); } 1114 bool is_stable() const { return has_annotation(_field_Stable); } 1115 }; 1116 1117 // This class also doubles as a holder for metadata cleanup. 1118 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1119 private: 1120 ClassLoaderData* _loader_data; 1121 AnnotationArray* _field_annotations; 1122 AnnotationArray* _field_type_annotations; 1123 public: 1124 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1125 AnnotationCollector(_in_field), 1126 _loader_data(loader_data), 1127 _field_annotations(NULL), 1128 _field_type_annotations(NULL) {} 1129 ~FieldAnnotationCollector(); 1130 void apply_to(FieldInfo* f); 1131 AnnotationArray* field_annotations() { return _field_annotations; } 1132 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1133 1134 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1135 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1136 }; 1137 1138 class MethodAnnotationCollector : public AnnotationCollector{ 1139 public: 1140 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1141 void apply_to(const methodHandle& m); 1142 }; 1143 1144 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1145 public: 1146 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1147 void apply_to(InstanceKlass* ik); 1148 }; 1149 1150 1151 static int skip_annotation_value(const u1*, int, int); // fwd decl 1152 1153 // Safely increment index by val if does not pass limit 1154 #define SAFE_ADD(index, limit, val) \ 1155 if (index >= limit - val) return limit; \ 1156 index += val; 1157 1158 // Skip an annotation. Return >=limit if there is any problem. 1159 static int skip_annotation(const u1* buffer, int limit, int index) { 1160 assert(buffer != NULL, "invariant"); 1161 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1162 // value := switch (tag:u1) { ... } 1163 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1164 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1165 while (--nmem >= 0 && index < limit) { 1166 SAFE_ADD(index, limit, 2); // skip member 1167 index = skip_annotation_value(buffer, limit, index); 1168 } 1169 return index; 1170 } 1171 1172 // Skip an annotation value. Return >=limit if there is any problem. 1173 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1174 assert(buffer != NULL, "invariant"); 1175 1176 // value := switch (tag:u1) { 1177 // case B, C, I, S, Z, D, F, J, c: con:u2; 1178 // case e: e_class:u2 e_name:u2; 1179 // case s: s_con:u2; 1180 // case [: do(nval:u2) {value}; 1181 // case @: annotation; 1182 // case s: s_con:u2; 1183 // } 1184 SAFE_ADD(index, limit, 1); // read tag 1185 const u1 tag = buffer[index - 1]; 1186 switch (tag) { 1187 case 'B': 1188 case 'C': 1189 case 'I': 1190 case 'S': 1191 case 'Z': 1192 case 'D': 1193 case 'F': 1194 case 'J': 1195 case 'c': 1196 case 's': 1197 SAFE_ADD(index, limit, 2); // skip con or s_con 1198 break; 1199 case 'e': 1200 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1201 break; 1202 case '[': 1203 { 1204 SAFE_ADD(index, limit, 2); // read nval 1205 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1206 while (--nval >= 0 && index < limit) { 1207 index = skip_annotation_value(buffer, limit, index); 1208 } 1209 } 1210 break; 1211 case '@': 1212 index = skip_annotation(buffer, limit, index); 1213 break; 1214 default: 1215 return limit; // bad tag byte 1216 } 1217 return index; 1218 } 1219 1220 // Sift through annotations, looking for those significant to the VM: 1221 static void parse_annotations(const ConstantPool* const cp, 1222 const u1* buffer, int limit, 1223 AnnotationCollector* coll, 1224 ClassLoaderData* loader_data, 1225 TRAPS) { 1226 1227 assert(cp != NULL, "invariant"); 1228 assert(buffer != NULL, "invariant"); 1229 assert(coll != NULL, "invariant"); 1230 assert(loader_data != NULL, "invariant"); 1231 1232 // annotations := do(nann:u2) {annotation} 1233 int index = 2; // read nann 1234 if (index >= limit) return; 1235 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1236 enum { // initial annotation layout 1237 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1238 count_off = 2, // u2 such as 1 (one value) 1239 member_off = 4, // utf8 such as 'value' 1240 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1241 e_tag_val = 'e', 1242 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1243 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1244 e_size = 11, // end of 'e' annotation 1245 c_tag_val = 'c', // payload is type 1246 c_con_off = 7, // utf8 payload, such as 'I' 1247 c_size = 9, // end of 'c' annotation 1248 s_tag_val = 's', // payload is String 1249 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1250 s_size = 9, 1251 min_size = 6 // smallest possible size (zero members) 1252 }; 1253 // Cannot add min_size to index in case of overflow MAX_INT 1254 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1255 int index0 = index; 1256 index = skip_annotation(buffer, limit, index); 1257 const u1* const abase = buffer + index0; 1258 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1259 const int count = Bytes::get_Java_u2((address)abase + count_off); 1260 const Symbol* const aname = check_symbol_at(cp, atype); 1261 if (aname == NULL) break; // invalid annotation name 1262 const Symbol* member = NULL; 1263 if (count >= 1) { 1264 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1265 member = check_symbol_at(cp, member_index); 1266 if (member == NULL) break; // invalid member name 1267 } 1268 1269 // Here is where parsing particular annotations will take place. 1270 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1271 if (AnnotationCollector::_unknown == id) continue; 1272 coll->set_annotation(id); 1273 1274 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1275 // @Contended can optionally specify the contention group. 1276 // 1277 // Contended group defines the equivalence class over the fields: 1278 // the fields within the same contended group are not treated distinct. 1279 // The only exception is default group, which does not incur the 1280 // equivalence. Naturally, contention group for classes is meaningless. 1281 // 1282 // While the contention group is specified as String, annotation 1283 // values are already interned, and we might as well use the constant 1284 // pool index as the group tag. 1285 // 1286 u2 group_index = 0; // default contended group 1287 if (count == 1 1288 && s_size == (index - index0) // match size 1289 && s_tag_val == *(abase + tag_off) 1290 && member == vmSymbols::value_name()) { 1291 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1292 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1293 group_index = 0; // default contended group 1294 } 1295 } 1296 coll->set_contended_group(group_index); 1297 } 1298 } 1299 } 1300 1301 1302 // Parse attributes for a field. 1303 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1304 u2 attributes_count, 1305 bool is_static, u2 signature_index, 1306 u2* const constantvalue_index_addr, 1307 bool* const is_synthetic_addr, 1308 u2* const generic_signature_index_addr, 1309 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1310 TRAPS) { 1311 assert(cfs != NULL, "invariant"); 1312 assert(constantvalue_index_addr != NULL, "invariant"); 1313 assert(is_synthetic_addr != NULL, "invariant"); 1314 assert(generic_signature_index_addr != NULL, "invariant"); 1315 assert(parsed_annotations != NULL, "invariant"); 1316 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1317 1318 u2 constantvalue_index = 0; 1319 u2 generic_signature_index = 0; 1320 bool is_synthetic = false; 1321 const u1* runtime_visible_annotations = NULL; 1322 int runtime_visible_annotations_length = 0; 1323 const u1* runtime_invisible_annotations = NULL; 1324 int runtime_invisible_annotations_length = 0; 1325 const u1* runtime_visible_type_annotations = NULL; 1326 int runtime_visible_type_annotations_length = 0; 1327 const u1* runtime_invisible_type_annotations = NULL; 1328 int runtime_invisible_type_annotations_length = 0; 1329 bool runtime_invisible_annotations_exists = false; 1330 bool runtime_invisible_type_annotations_exists = false; 1331 const ConstantPool* const cp = _cp; 1332 1333 while (attributes_count--) { 1334 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1335 const u2 attribute_name_index = cfs->get_u2_fast(); 1336 const u4 attribute_length = cfs->get_u4_fast(); 1337 check_property(valid_symbol_at(attribute_name_index), 1338 "Invalid field attribute index %u in class file %s", 1339 attribute_name_index, 1340 CHECK); 1341 1342 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1343 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1344 // ignore if non-static 1345 if (constantvalue_index != 0) { 1346 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1347 } 1348 check_property( 1349 attribute_length == 2, 1350 "Invalid ConstantValue field attribute length %u in class file %s", 1351 attribute_length, CHECK); 1352 1353 constantvalue_index = cfs->get_u2(CHECK); 1354 if (_need_verify) { 1355 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1356 } 1357 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1358 if (attribute_length != 0) { 1359 classfile_parse_error( 1360 "Invalid Synthetic field attribute length %u in class file %s", 1361 attribute_length, CHECK); 1362 } 1363 is_synthetic = true; 1364 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1365 if (attribute_length != 0) { 1366 classfile_parse_error( 1367 "Invalid Deprecated field attribute length %u in class file %s", 1368 attribute_length, CHECK); 1369 } 1370 } else if (_major_version >= JAVA_1_5_VERSION) { 1371 if (attribute_name == vmSymbols::tag_signature()) { 1372 if (generic_signature_index != 0) { 1373 classfile_parse_error( 1374 "Multiple Signature attributes for field in class file %s", CHECK); 1375 } 1376 if (attribute_length != 2) { 1377 classfile_parse_error( 1378 "Wrong size %u for field's Signature attribute in class file %s", 1379 attribute_length, CHECK); 1380 } 1381 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1382 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1383 if (runtime_visible_annotations != NULL) { 1384 classfile_parse_error( 1385 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1386 } 1387 runtime_visible_annotations_length = attribute_length; 1388 runtime_visible_annotations = cfs->current(); 1389 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1390 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1391 parse_annotations(cp, 1392 runtime_visible_annotations, 1393 runtime_visible_annotations_length, 1394 parsed_annotations, 1395 _loader_data, 1396 CHECK); 1397 cfs->skip_u1_fast(runtime_visible_annotations_length); 1398 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1399 if (runtime_invisible_annotations_exists) { 1400 classfile_parse_error( 1401 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1402 } 1403 runtime_invisible_annotations_exists = true; 1404 if (PreserveAllAnnotations) { 1405 runtime_invisible_annotations_length = attribute_length; 1406 runtime_invisible_annotations = cfs->current(); 1407 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1408 } 1409 cfs->skip_u1(attribute_length, CHECK); 1410 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1411 if (runtime_visible_type_annotations != NULL) { 1412 classfile_parse_error( 1413 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1414 } 1415 runtime_visible_type_annotations_length = attribute_length; 1416 runtime_visible_type_annotations = cfs->current(); 1417 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1418 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1419 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1420 if (runtime_invisible_type_annotations_exists) { 1421 classfile_parse_error( 1422 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1423 } else { 1424 runtime_invisible_type_annotations_exists = true; 1425 } 1426 if (PreserveAllAnnotations) { 1427 runtime_invisible_type_annotations_length = attribute_length; 1428 runtime_invisible_type_annotations = cfs->current(); 1429 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1430 } 1431 cfs->skip_u1(attribute_length, CHECK); 1432 } else { 1433 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1434 } 1435 } else { 1436 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1437 } 1438 } 1439 1440 *constantvalue_index_addr = constantvalue_index; 1441 *is_synthetic_addr = is_synthetic; 1442 *generic_signature_index_addr = generic_signature_index; 1443 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1444 runtime_visible_annotations_length, 1445 runtime_invisible_annotations, 1446 runtime_invisible_annotations_length, 1447 CHECK); 1448 parsed_annotations->set_field_annotations(a); 1449 a = assemble_annotations(runtime_visible_type_annotations, 1450 runtime_visible_type_annotations_length, 1451 runtime_invisible_type_annotations, 1452 runtime_invisible_type_annotations_length, 1453 CHECK); 1454 parsed_annotations->set_field_type_annotations(a); 1455 return; 1456 } 1457 1458 1459 // Field allocation types. Used for computing field offsets. 1460 1461 enum FieldAllocationType { 1462 STATIC_OOP, // Oops 1463 STATIC_BYTE, // Boolean, Byte, char 1464 STATIC_SHORT, // shorts 1465 STATIC_WORD, // ints 1466 STATIC_DOUBLE, // aligned long or double 1467 STATIC_FLATTENABLE, // flattenable field 1468 NONSTATIC_OOP, 1469 NONSTATIC_BYTE, 1470 NONSTATIC_SHORT, 1471 NONSTATIC_WORD, 1472 NONSTATIC_DOUBLE, 1473 NONSTATIC_FLATTENABLE, 1474 MAX_FIELD_ALLOCATION_TYPE, 1475 BAD_ALLOCATION_TYPE = -1 1476 }; 1477 1478 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1479 BAD_ALLOCATION_TYPE, // 0 1480 BAD_ALLOCATION_TYPE, // 1 1481 BAD_ALLOCATION_TYPE, // 2 1482 BAD_ALLOCATION_TYPE, // 3 1483 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1484 NONSTATIC_SHORT, // T_CHAR = 5, 1485 NONSTATIC_WORD, // T_FLOAT = 6, 1486 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1487 NONSTATIC_BYTE, // T_BYTE = 8, 1488 NONSTATIC_SHORT, // T_SHORT = 9, 1489 NONSTATIC_WORD, // T_INT = 10, 1490 NONSTATIC_DOUBLE, // T_LONG = 11, 1491 NONSTATIC_OOP, // T_OBJECT = 12, 1492 NONSTATIC_OOP, // T_ARRAY = 13, 1493 BAD_ALLOCATION_TYPE, // T_VOID = 15, 1494 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16, 1495 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17, 1496 BAD_ALLOCATION_TYPE, // T_METADATA = 18, 1497 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19, 1498 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20, 1499 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21, 1500 BAD_ALLOCATION_TYPE, // 0 1501 BAD_ALLOCATION_TYPE, // 1 1502 BAD_ALLOCATION_TYPE, // 2 1503 BAD_ALLOCATION_TYPE, // 3 1504 STATIC_BYTE , // T_BOOLEAN = 4, 1505 STATIC_SHORT, // T_CHAR = 5, 1506 STATIC_WORD, // T_FLOAT = 6, 1507 STATIC_DOUBLE, // T_DOUBLE = 7, 1508 STATIC_BYTE, // T_BYTE = 8, 1509 STATIC_SHORT, // T_SHORT = 9, 1510 STATIC_WORD, // T_INT = 10, 1511 STATIC_DOUBLE, // T_LONG = 11, 1512 STATIC_OOP, // T_OBJECT = 12, 1513 STATIC_OOP, // T_ARRAY = 13, 1514 BAD_ALLOCATION_TYPE, // T_VOID = 15, 1515 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16, 1516 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17, 1517 BAD_ALLOCATION_TYPE, // T_METADATA = 18, 1518 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19, 1519 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20, 1520 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21, 1521 }; 1522 1523 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) { 1524 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1525 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1526 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1527 if (is_flattenable) { 1528 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE; 1529 } 1530 return result; 1531 } 1532 1533 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1534 public: 1535 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1536 1537 FieldAllocationCount() { 1538 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1539 count[i] = 0; 1540 } 1541 } 1542 1543 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) { 1544 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable); 1545 if (atype != BAD_ALLOCATION_TYPE) { 1546 // Make sure there is no overflow with injected fields. 1547 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1548 count[atype]++; 1549 } 1550 return atype; 1551 } 1552 }; 1553 1554 // Side-effects: populates the _fields, _fields_annotations, 1555 // _fields_type_annotations fields 1556 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1557 bool is_interface, 1558 bool is_concrete_value_type, 1559 FieldAllocationCount* const fac, 1560 ConstantPool* cp, 1561 const int cp_size, 1562 u2* const java_fields_count_ptr, 1563 TRAPS) { 1564 1565 assert(cfs != NULL, "invariant"); 1566 assert(fac != NULL, "invariant"); 1567 assert(cp != NULL, "invariant"); 1568 assert(java_fields_count_ptr != NULL, "invariant"); 1569 1570 assert(NULL == _fields, "invariant"); 1571 assert(NULL == _fields_annotations, "invariant"); 1572 assert(NULL == _fields_type_annotations, "invariant"); 1573 1574 cfs->guarantee_more(2, CHECK); // length 1575 const u2 length = cfs->get_u2_fast(); 1576 *java_fields_count_ptr = length; 1577 1578 int num_injected = 0; 1579 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1580 &num_injected); 1581 1582 const int total_fields = length + num_injected + (is_concrete_value_type ? 1 : 0); 1583 1584 // The field array starts with tuples of shorts 1585 // [access, name index, sig index, initial value index, byte offset]. 1586 // A generic signature slot only exists for field with generic 1587 // signature attribute. And the access flag is set with 1588 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1589 // signature slots are at the end of the field array and after all 1590 // other fields data. 1591 // 1592 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1593 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1594 // ... 1595 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1596 // [generic signature index] 1597 // [generic signature index] 1598 // ... 1599 // 1600 // Allocate a temporary resource array for field data. For each field, 1601 // a slot is reserved in the temporary array for the generic signature 1602 // index. After parsing all fields, the data are copied to a permanent 1603 // array and any unused slots will be discarded. 1604 ResourceMark rm(THREAD); 1605 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1606 u2, 1607 total_fields * (FieldInfo::field_slots + 1)); 1608 1609 // The generic signature slots start after all other fields' data. 1610 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1611 int num_generic_signature = 0; 1612 for (int n = 0; n < length; n++) { 1613 // access_flags, name_index, descriptor_index, attributes_count 1614 cfs->guarantee_more(8, CHECK); 1615 1616 AccessFlags access_flags; 1617 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1618 verify_legal_field_modifiers(flags, is_interface, CHECK); 1619 access_flags.set_flags(flags); 1620 1621 const u2 name_index = cfs->get_u2_fast(); 1622 check_property(valid_symbol_at(name_index), 1623 "Invalid constant pool index %u for field name in class file %s", 1624 name_index, CHECK); 1625 const Symbol* const name = cp->symbol_at(name_index); 1626 verify_legal_field_name(name, CHECK); 1627 1628 const u2 signature_index = cfs->get_u2_fast(); 1629 check_property(valid_symbol_at(signature_index), 1630 "Invalid constant pool index %u for field signature in class file %s", 1631 signature_index, CHECK); 1632 const Symbol* const sig = cp->symbol_at(signature_index); 1633 verify_legal_field_signature(name, sig, CHECK); 1634 if (access_flags.is_flattenable()) { 1635 _has_flattenable_fields = true; 1636 } 1637 1638 u2 constantvalue_index = 0; 1639 bool is_synthetic = false; 1640 u2 generic_signature_index = 0; 1641 const bool is_static = access_flags.is_static(); 1642 FieldAnnotationCollector parsed_annotations(_loader_data); 1643 1644 const u2 attributes_count = cfs->get_u2_fast(); 1645 if (attributes_count > 0) { 1646 parse_field_attributes(cfs, 1647 attributes_count, 1648 is_static, 1649 signature_index, 1650 &constantvalue_index, 1651 &is_synthetic, 1652 &generic_signature_index, 1653 &parsed_annotations, 1654 CHECK); 1655 1656 if (parsed_annotations.field_annotations() != NULL) { 1657 if (_fields_annotations == NULL) { 1658 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1659 _loader_data, length, NULL, 1660 CHECK); 1661 } 1662 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1663 parsed_annotations.set_field_annotations(NULL); 1664 } 1665 if (parsed_annotations.field_type_annotations() != NULL) { 1666 if (_fields_type_annotations == NULL) { 1667 _fields_type_annotations = 1668 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1669 length, 1670 NULL, 1671 CHECK); 1672 } 1673 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1674 parsed_annotations.set_field_type_annotations(NULL); 1675 } 1676 1677 if (is_synthetic) { 1678 access_flags.set_is_synthetic(); 1679 } 1680 if (generic_signature_index != 0) { 1681 access_flags.set_field_has_generic_signature(); 1682 fa[generic_signature_slot] = generic_signature_index; 1683 generic_signature_slot ++; 1684 num_generic_signature ++; 1685 } 1686 } 1687 1688 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1689 field->initialize(access_flags.as_short(), 1690 name_index, 1691 signature_index, 1692 constantvalue_index); 1693 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1694 1695 // Remember how many oops we encountered and compute allocation type 1696 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable()); 1697 field->set_allocation_type(atype); 1698 1699 // After field is initialized with type, we can augment it with aux info 1700 if (parsed_annotations.has_any_annotations()) 1701 parsed_annotations.apply_to(field); 1702 } 1703 1704 int index = length; 1705 if (num_injected != 0) { 1706 for (int n = 0; n < num_injected; n++) { 1707 // Check for duplicates 1708 if (injected[n].may_be_java) { 1709 const Symbol* const name = injected[n].name(); 1710 const Symbol* const signature = injected[n].signature(); 1711 bool duplicate = false; 1712 for (int i = 0; i < length; i++) { 1713 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1714 if (name == cp->symbol_at(f->name_index()) && 1715 signature == cp->symbol_at(f->signature_index())) { 1716 // Symbol is desclared in Java so skip this one 1717 duplicate = true; 1718 break; 1719 } 1720 } 1721 if (duplicate) { 1722 // These will be removed from the field array at the end 1723 continue; 1724 } 1725 } 1726 1727 // Injected field 1728 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1729 field->initialize(JVM_ACC_FIELD_INTERNAL, 1730 injected[n].name_index, 1731 injected[n].signature_index, 1732 0); 1733 1734 const BasicType type = FieldType::basic_type(injected[n].signature()); 1735 1736 // Remember how many oops we encountered and compute allocation type 1737 const FieldAllocationType atype = fac->update(false, type, false); 1738 field->set_allocation_type(atype); 1739 index++; 1740 } 1741 } 1742 1743 if (is_concrete_value_type) { 1744 index = length + num_injected; 1745 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1746 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC, 1747 vmSymbols::default_value_name_enum, 1748 vmSymbols::java_lang_Object_enum, 1749 0); 1750 const BasicType type = FieldType::basic_type(vmSymbols::object_signature()); 1751 const FieldAllocationType atype = fac->update(true, type, false); 1752 field->set_allocation_type(atype); 1753 index++; 1754 } 1755 1756 assert(NULL == _fields, "invariant"); 1757 1758 _fields = 1759 MetadataFactory::new_array<u2>(_loader_data, 1760 index * FieldInfo::field_slots + num_generic_signature, 1761 CHECK); 1762 // Sometimes injected fields already exist in the Java source so 1763 // the fields array could be too long. In that case the 1764 // fields array is trimed. Also unused slots that were reserved 1765 // for generic signature indexes are discarded. 1766 { 1767 int i = 0; 1768 for (; i < index * FieldInfo::field_slots; i++) { 1769 _fields->at_put(i, fa[i]); 1770 } 1771 for (int j = total_fields * FieldInfo::field_slots; 1772 j < generic_signature_slot; j++) { 1773 _fields->at_put(i++, fa[j]); 1774 } 1775 assert(_fields->length() == i, ""); 1776 } 1777 1778 if (_need_verify && length > 1) { 1779 // Check duplicated fields 1780 ResourceMark rm(THREAD); 1781 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1782 THREAD, NameSigHash*, HASH_ROW_SIZE); 1783 initialize_hashtable(names_and_sigs); 1784 bool dup = false; 1785 const Symbol* name = NULL; 1786 const Symbol* sig = NULL; 1787 { 1788 debug_only(NoSafepointVerifier nsv;) 1789 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1790 name = fs.name(); 1791 sig = fs.signature(); 1792 // If no duplicates, add name/signature in hashtable names_and_sigs. 1793 if (!put_after_lookup(name, sig, names_and_sigs)) { 1794 dup = true; 1795 break; 1796 } 1797 } 1798 } 1799 if (dup) { 1800 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1801 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1802 } 1803 } 1804 } 1805 1806 1807 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1808 u4 code_length, 1809 u4 exception_table_length, 1810 TRAPS) { 1811 assert(cfs != NULL, "invariant"); 1812 1813 const unsafe_u2* const exception_table_start = cfs->current(); 1814 assert(exception_table_start != NULL, "null exception table"); 1815 1816 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1817 // end_pc, 1818 // handler_pc, 1819 // catch_type_index 1820 1821 // Will check legal target after parsing code array in verifier. 1822 if (_need_verify) { 1823 for (unsigned int i = 0; i < exception_table_length; i++) { 1824 const u2 start_pc = cfs->get_u2_fast(); 1825 const u2 end_pc = cfs->get_u2_fast(); 1826 const u2 handler_pc = cfs->get_u2_fast(); 1827 const u2 catch_type_index = cfs->get_u2_fast(); 1828 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1829 "Illegal exception table range in class file %s", 1830 CHECK_NULL); 1831 guarantee_property(handler_pc < code_length, 1832 "Illegal exception table handler in class file %s", 1833 CHECK_NULL); 1834 if (catch_type_index != 0) { 1835 guarantee_property(valid_klass_reference_at(catch_type_index), 1836 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1837 } 1838 } 1839 } else { 1840 cfs->skip_u2_fast(exception_table_length * 4); 1841 } 1842 return exception_table_start; 1843 } 1844 1845 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1846 u4 code_length, 1847 CompressedLineNumberWriteStream**const write_stream, 1848 TRAPS) { 1849 1850 const ClassFileStream* const cfs = _stream; 1851 unsigned int num_entries = cfs->get_u2(CHECK); 1852 1853 // Each entry is a u2 start_pc, and a u2 line_number 1854 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1855 1856 // Verify line number attribute and table length 1857 check_property( 1858 code_attribute_length == sizeof(u2) + length_in_bytes, 1859 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1860 1861 cfs->guarantee_more(length_in_bytes, CHECK); 1862 1863 if ((*write_stream) == NULL) { 1864 if (length_in_bytes > fixed_buffer_size) { 1865 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1866 } else { 1867 (*write_stream) = new CompressedLineNumberWriteStream( 1868 _linenumbertable_buffer, fixed_buffer_size); 1869 } 1870 } 1871 1872 while (num_entries-- > 0) { 1873 const u2 bci = cfs->get_u2_fast(); // start_pc 1874 const u2 line = cfs->get_u2_fast(); // line_number 1875 guarantee_property(bci < code_length, 1876 "Invalid pc in LineNumberTable in class file %s", CHECK); 1877 (*write_stream)->write_pair(bci, line); 1878 } 1879 } 1880 1881 1882 class LVT_Hash : public AllStatic { 1883 public: 1884 1885 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1886 /* 1887 * 3-tuple start_bci/length/slot has to be unique key, 1888 * so the following comparison seems to be redundant: 1889 * && elem->name_cp_index == entry->_elem->name_cp_index 1890 */ 1891 return (e0.start_bci == e1.start_bci && 1892 e0.length == e1.length && 1893 e0.name_cp_index == e1.name_cp_index && 1894 e0.slot == e1.slot); 1895 } 1896 1897 static unsigned int hash(LocalVariableTableElement const& e0) { 1898 unsigned int raw_hash = e0.start_bci; 1899 1900 raw_hash = e0.length + raw_hash * 37; 1901 raw_hash = e0.name_cp_index + raw_hash * 37; 1902 raw_hash = e0.slot + raw_hash * 37; 1903 1904 return raw_hash; 1905 } 1906 }; 1907 1908 1909 // Class file LocalVariableTable elements. 1910 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1911 public: 1912 u2 start_bci; 1913 u2 length; 1914 u2 name_cp_index; 1915 u2 descriptor_cp_index; 1916 u2 slot; 1917 }; 1918 1919 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1920 LocalVariableTableElement* const lvt) { 1921 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1922 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1923 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1924 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1925 lvt->signature_cp_index = 0; 1926 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1927 } 1928 1929 // Function is used to parse both attributes: 1930 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1931 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1932 u4 code_length, 1933 u2 max_locals, 1934 u4 code_attribute_length, 1935 u2* const localvariable_table_length, 1936 bool isLVTT, 1937 TRAPS) { 1938 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1939 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1940 const unsigned int size = 1941 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1942 1943 const ConstantPool* const cp = _cp; 1944 1945 // Verify local variable table attribute has right length 1946 if (_need_verify) { 1947 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1948 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1949 } 1950 1951 const unsafe_u2* const localvariable_table_start = cfs->current(); 1952 assert(localvariable_table_start != NULL, "null local variable table"); 1953 if (!_need_verify) { 1954 cfs->skip_u2_fast(size); 1955 } else { 1956 cfs->guarantee_more(size * 2, CHECK_NULL); 1957 for(int i = 0; i < (*localvariable_table_length); i++) { 1958 const u2 start_pc = cfs->get_u2_fast(); 1959 const u2 length = cfs->get_u2_fast(); 1960 const u2 name_index = cfs->get_u2_fast(); 1961 const u2 descriptor_index = cfs->get_u2_fast(); 1962 const u2 index = cfs->get_u2_fast(); 1963 // Assign to a u4 to avoid overflow 1964 const u4 end_pc = (u4)start_pc + (u4)length; 1965 1966 if (start_pc >= code_length) { 1967 classfile_parse_error( 1968 "Invalid start_pc %u in %s in class file %s", 1969 start_pc, tbl_name, CHECK_NULL); 1970 } 1971 if (end_pc > code_length) { 1972 classfile_parse_error( 1973 "Invalid length %u in %s in class file %s", 1974 length, tbl_name, CHECK_NULL); 1975 } 1976 const int cp_size = cp->length(); 1977 guarantee_property(valid_symbol_at(name_index), 1978 "Name index %u in %s has bad constant type in class file %s", 1979 name_index, tbl_name, CHECK_NULL); 1980 guarantee_property(valid_symbol_at(descriptor_index), 1981 "Signature index %u in %s has bad constant type in class file %s", 1982 descriptor_index, tbl_name, CHECK_NULL); 1983 1984 const Symbol* const name = cp->symbol_at(name_index); 1985 const Symbol* const sig = cp->symbol_at(descriptor_index); 1986 verify_legal_field_name(name, CHECK_NULL); 1987 u2 extra_slot = 0; 1988 if (!isLVTT) { 1989 verify_legal_field_signature(name, sig, CHECK_NULL); 1990 1991 // 4894874: check special cases for double and long local variables 1992 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1993 sig == vmSymbols::type_signature(T_LONG)) { 1994 extra_slot = 1; 1995 } 1996 } 1997 guarantee_property((index + extra_slot) < max_locals, 1998 "Invalid index %u in %s in class file %s", 1999 index, tbl_name, CHECK_NULL); 2000 } 2001 } 2002 return localvariable_table_start; 2003 } 2004 2005 2006 void ClassFileParser::parse_type_array(u2 array_length, 2007 u4 code_length, 2008 u4* const u1_index, 2009 u4* const u2_index, 2010 u1* const u1_array, 2011 u2* const u2_array, 2012 TRAPS) { 2013 const ClassFileStream* const cfs = _stream; 2014 u2 index = 0; // index in the array with long/double occupying two slots 2015 u4 i1 = *u1_index; 2016 u4 i2 = *u2_index + 1; 2017 for(int i = 0; i < array_length; i++) { 2018 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 2019 index++; 2020 if (tag == ITEM_Long || tag == ITEM_Double) { 2021 index++; 2022 } else if (tag == ITEM_Object) { 2023 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 2024 guarantee_property(valid_klass_reference_at(class_index), 2025 "Bad class index %u in StackMap in class file %s", 2026 class_index, CHECK); 2027 } else if (tag == ITEM_Uninitialized) { 2028 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 2029 guarantee_property( 2030 offset < code_length, 2031 "Bad uninitialized type offset %u in StackMap in class file %s", 2032 offset, CHECK); 2033 } else { 2034 guarantee_property( 2035 tag <= (u1)ITEM_Uninitialized, 2036 "Unknown variable type %u in StackMap in class file %s", 2037 tag, CHECK); 2038 } 2039 } 2040 u2_array[*u2_index] = index; 2041 *u1_index = i1; 2042 *u2_index = i2; 2043 } 2044 2045 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 2046 u4 code_attribute_length, 2047 bool need_verify, 2048 TRAPS) { 2049 assert(cfs != NULL, "invariant"); 2050 2051 if (0 == code_attribute_length) { 2052 return NULL; 2053 } 2054 2055 const u1* const stackmap_table_start = cfs->current(); 2056 assert(stackmap_table_start != NULL, "null stackmap table"); 2057 2058 // check code_attribute_length first 2059 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2060 2061 if (!need_verify && !DumpSharedSpaces) { 2062 return NULL; 2063 } 2064 return stackmap_table_start; 2065 } 2066 2067 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2068 u2* const checked_exceptions_length, 2069 u4 method_attribute_length, 2070 TRAPS) { 2071 assert(cfs != NULL, "invariant"); 2072 assert(checked_exceptions_length != NULL, "invariant"); 2073 2074 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2075 *checked_exceptions_length = cfs->get_u2_fast(); 2076 const unsigned int size = 2077 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2078 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2079 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2080 if (!_need_verify) { 2081 cfs->skip_u2_fast(size); 2082 } else { 2083 // Verify each value in the checked exception table 2084 u2 checked_exception; 2085 const u2 len = *checked_exceptions_length; 2086 cfs->guarantee_more(2 * len, CHECK_NULL); 2087 for (int i = 0; i < len; i++) { 2088 checked_exception = cfs->get_u2_fast(); 2089 check_property( 2090 valid_klass_reference_at(checked_exception), 2091 "Exception name has bad type at constant pool %u in class file %s", 2092 checked_exception, CHECK_NULL); 2093 } 2094 } 2095 // check exceptions attribute length 2096 if (_need_verify) { 2097 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2098 sizeof(u2) * size), 2099 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2100 } 2101 return checked_exceptions_start; 2102 } 2103 2104 void ClassFileParser::throwIllegalSignature(const char* type, 2105 const Symbol* name, 2106 const Symbol* sig, 2107 TRAPS) const { 2108 assert(name != NULL, "invariant"); 2109 assert(sig != NULL, "invariant"); 2110 2111 ResourceMark rm(THREAD); 2112 Exceptions::fthrow(THREAD_AND_LOCATION, 2113 vmSymbols::java_lang_ClassFormatError(), 2114 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2115 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2116 } 2117 2118 AnnotationCollector::ID 2119 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2120 const Symbol* name) { 2121 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2122 // Privileged code can use all annotations. Other code silently drops some. 2123 const bool privileged = loader_data->is_the_null_class_loader_data() || 2124 loader_data->is_platform_class_loader_data() || 2125 loader_data->is_anonymous(); 2126 switch (sid) { 2127 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2128 if (_location != _in_method) break; // only allow for methods 2129 if (!privileged) break; // only allow in privileged code 2130 return _method_CallerSensitive; 2131 } 2132 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2133 if (_location != _in_method) break; // only allow for methods 2134 if (!privileged) break; // only allow in privileged code 2135 return _method_ForceInline; 2136 } 2137 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2138 if (_location != _in_method) break; // only allow for methods 2139 if (!privileged) break; // only allow in privileged code 2140 return _method_DontInline; 2141 } 2142 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2143 if (_location != _in_method) break; // only allow for methods 2144 if (!privileged) break; // only allow in privileged code 2145 return _method_InjectedProfile; 2146 } 2147 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2148 if (_location != _in_method) break; // only allow for methods 2149 if (!privileged) break; // only allow in privileged code 2150 return _method_LambdaForm_Compiled; 2151 } 2152 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): { 2153 if (_location != _in_method) break; // only allow for methods 2154 if (!privileged) break; // only allow in privileged code 2155 return _method_LambdaForm_Hidden; 2156 } 2157 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2158 if (_location != _in_method) break; // only allow for methods 2159 if (!privileged) break; // only allow in privileged code 2160 return _method_HotSpotIntrinsicCandidate; 2161 } 2162 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2163 if (_location != _in_field) break; // only allow for fields 2164 if (!privileged) break; // only allow in privileged code 2165 return _field_Stable; 2166 } 2167 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2168 if (_location != _in_field && _location != _in_class) { 2169 break; // only allow for fields and classes 2170 } 2171 if (!EnableContended || (RestrictContended && !privileged)) { 2172 break; // honor privileges 2173 } 2174 return _jdk_internal_vm_annotation_Contended; 2175 } 2176 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2177 if (_location != _in_method) break; // only allow for methods 2178 if (RestrictReservedStack && !privileged) break; // honor privileges 2179 return _jdk_internal_vm_annotation_ReservedStackAccess; 2180 } 2181 default: { 2182 break; 2183 } 2184 } 2185 return AnnotationCollector::_unknown; 2186 } 2187 2188 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2189 if (is_contended()) 2190 f->set_contended_group(contended_group()); 2191 if (is_stable()) 2192 f->set_stable(true); 2193 } 2194 2195 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2196 // If there's an error deallocate metadata for field annotations 2197 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2198 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2199 } 2200 2201 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2202 if (has_annotation(_method_CallerSensitive)) 2203 m->set_caller_sensitive(true); 2204 if (has_annotation(_method_ForceInline)) 2205 m->set_force_inline(true); 2206 if (has_annotation(_method_DontInline)) 2207 m->set_dont_inline(true); 2208 if (has_annotation(_method_InjectedProfile)) 2209 m->set_has_injected_profile(true); 2210 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2211 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2212 if (has_annotation(_method_LambdaForm_Hidden)) 2213 m->set_hidden(true); 2214 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2215 m->set_intrinsic_candidate(true); 2216 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2217 m->set_has_reserved_stack_access(true); 2218 } 2219 2220 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2221 assert(ik != NULL, "invariant"); 2222 ik->set_is_contended(is_contended()); 2223 } 2224 2225 #define MAX_ARGS_SIZE 255 2226 #define MAX_CODE_SIZE 65535 2227 #define INITIAL_MAX_LVT_NUMBER 256 2228 2229 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2230 * 2231 * Rules for LVT's and LVTT's are: 2232 * - There can be any number of LVT's and LVTT's. 2233 * - If there are n LVT's, it is the same as if there was just 2234 * one LVT containing all the entries from the n LVT's. 2235 * - There may be no more than one LVT entry per local variable. 2236 * Two LVT entries are 'equal' if these fields are the same: 2237 * start_pc, length, name, slot 2238 * - There may be no more than one LVTT entry per each LVT entry. 2239 * Each LVTT entry has to match some LVT entry. 2240 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2241 */ 2242 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2243 int lvt_cnt, 2244 u2* const localvariable_table_length, 2245 const unsafe_u2** const localvariable_table_start, 2246 int lvtt_cnt, 2247 u2* const localvariable_type_table_length, 2248 const unsafe_u2** const localvariable_type_table_start, 2249 TRAPS) { 2250 2251 ResourceMark rm(THREAD); 2252 2253 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2254 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2255 2256 LVT_HashTable* const table = new LVT_HashTable(); 2257 2258 // To fill LocalVariableTable in 2259 const Classfile_LVT_Element* cf_lvt; 2260 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2261 2262 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2263 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2264 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2265 copy_lvt_element(&cf_lvt[idx], lvt); 2266 // If no duplicates, add LVT elem in hashtable. 2267 if (table->put(*lvt, lvt) == false 2268 && _need_verify 2269 && _major_version >= JAVA_1_5_VERSION) { 2270 classfile_parse_error("Duplicated LocalVariableTable attribute " 2271 "entry for '%s' in class file %s", 2272 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2273 CHECK); 2274 } 2275 } 2276 } 2277 2278 // To merge LocalVariableTable and LocalVariableTypeTable 2279 const Classfile_LVT_Element* cf_lvtt; 2280 LocalVariableTableElement lvtt_elem; 2281 2282 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2283 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2284 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2285 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2286 LocalVariableTableElement** entry = table->get(lvtt_elem); 2287 if (entry == NULL) { 2288 if (_need_verify) { 2289 classfile_parse_error("LVTT entry for '%s' in class file %s " 2290 "does not match any LVT entry", 2291 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2292 CHECK); 2293 } 2294 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2295 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2296 "entry for '%s' in class file %s", 2297 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2298 CHECK); 2299 } else { 2300 // to add generic signatures into LocalVariableTable 2301 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2302 } 2303 } 2304 } 2305 } 2306 2307 2308 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2309 const u1* runtime_visible_annotations, 2310 int runtime_visible_annotations_length, 2311 const u1* runtime_invisible_annotations, 2312 int runtime_invisible_annotations_length, 2313 const u1* runtime_visible_parameter_annotations, 2314 int runtime_visible_parameter_annotations_length, 2315 const u1* runtime_invisible_parameter_annotations, 2316 int runtime_invisible_parameter_annotations_length, 2317 const u1* runtime_visible_type_annotations, 2318 int runtime_visible_type_annotations_length, 2319 const u1* runtime_invisible_type_annotations, 2320 int runtime_invisible_type_annotations_length, 2321 const u1* annotation_default, 2322 int annotation_default_length, 2323 TRAPS) { 2324 2325 AnnotationArray* a; 2326 2327 if (runtime_visible_annotations_length + 2328 runtime_invisible_annotations_length > 0) { 2329 a = assemble_annotations(runtime_visible_annotations, 2330 runtime_visible_annotations_length, 2331 runtime_invisible_annotations, 2332 runtime_invisible_annotations_length, 2333 CHECK); 2334 cm->set_method_annotations(a); 2335 } 2336 2337 if (runtime_visible_parameter_annotations_length + 2338 runtime_invisible_parameter_annotations_length > 0) { 2339 a = assemble_annotations(runtime_visible_parameter_annotations, 2340 runtime_visible_parameter_annotations_length, 2341 runtime_invisible_parameter_annotations, 2342 runtime_invisible_parameter_annotations_length, 2343 CHECK); 2344 cm->set_parameter_annotations(a); 2345 } 2346 2347 if (annotation_default_length > 0) { 2348 a = assemble_annotations(annotation_default, 2349 annotation_default_length, 2350 NULL, 2351 0, 2352 CHECK); 2353 cm->set_default_annotations(a); 2354 } 2355 2356 if (runtime_visible_type_annotations_length + 2357 runtime_invisible_type_annotations_length > 0) { 2358 a = assemble_annotations(runtime_visible_type_annotations, 2359 runtime_visible_type_annotations_length, 2360 runtime_invisible_type_annotations, 2361 runtime_invisible_type_annotations_length, 2362 CHECK); 2363 cm->set_type_annotations(a); 2364 } 2365 } 2366 2367 2368 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2369 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2370 // Method* to save footprint, so we only know the size of the resulting Method* when the 2371 // entire method attribute is parsed. 2372 // 2373 // The promoted_flags parameter is used to pass relevant access_flags 2374 // from the method back up to the containing klass. These flag values 2375 // are added to klass's access_flags. 2376 2377 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2378 bool is_interface, 2379 const ConstantPool* cp, 2380 AccessFlags* const promoted_flags, 2381 TRAPS) { 2382 assert(cfs != NULL, "invariant"); 2383 assert(cp != NULL, "invariant"); 2384 assert(promoted_flags != NULL, "invariant"); 2385 2386 ResourceMark rm(THREAD); 2387 // Parse fixed parts: 2388 // access_flags, name_index, descriptor_index, attributes_count 2389 cfs->guarantee_more(8, CHECK_NULL); 2390 2391 int flags = cfs->get_u2_fast(); 2392 const u2 name_index = cfs->get_u2_fast(); 2393 const int cp_size = cp->length(); 2394 check_property( 2395 valid_symbol_at(name_index), 2396 "Illegal constant pool index %u for method name in class file %s", 2397 name_index, CHECK_NULL); 2398 const Symbol* const name = cp->symbol_at(name_index); 2399 verify_legal_method_name(name, CHECK_NULL); 2400 2401 const u2 signature_index = cfs->get_u2_fast(); 2402 guarantee_property( 2403 valid_symbol_at(signature_index), 2404 "Illegal constant pool index %u for method signature in class file %s", 2405 signature_index, CHECK_NULL); 2406 const Symbol* const signature = cp->symbol_at(signature_index); 2407 2408 if (name == vmSymbols::class_initializer_name()) { 2409 // We ignore the other access flags for a valid class initializer. 2410 // (JVM Spec 2nd ed., chapter 4.6) 2411 if (_major_version < 51) { // backward compatibility 2412 flags = JVM_ACC_STATIC; 2413 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2414 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2415 } else { 2416 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2417 } 2418 } else { 2419 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2420 } 2421 2422 if (name == vmSymbols::object_initializer_name() && is_interface) { 2423 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2424 } 2425 2426 int args_size = -1; // only used when _need_verify is true 2427 if (_need_verify) { 2428 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2429 verify_legal_method_signature(name, signature, CHECK_NULL); 2430 if (args_size > MAX_ARGS_SIZE) { 2431 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2432 } 2433 } 2434 2435 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2436 2437 // Default values for code and exceptions attribute elements 2438 u2 max_stack = 0; 2439 u2 max_locals = 0; 2440 u4 code_length = 0; 2441 const u1* code_start = 0; 2442 u2 exception_table_length = 0; 2443 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2444 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2445 u2 checked_exceptions_length = 0; 2446 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2447 CompressedLineNumberWriteStream* linenumber_table = NULL; 2448 int linenumber_table_length = 0; 2449 int total_lvt_length = 0; 2450 u2 lvt_cnt = 0; 2451 u2 lvtt_cnt = 0; 2452 bool lvt_allocated = false; 2453 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2454 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2455 u2* localvariable_table_length = NULL; 2456 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2457 u2* localvariable_type_table_length = NULL; 2458 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2459 int method_parameters_length = -1; 2460 const u1* method_parameters_data = NULL; 2461 bool method_parameters_seen = false; 2462 bool parsed_code_attribute = false; 2463 bool parsed_checked_exceptions_attribute = false; 2464 bool parsed_stackmap_attribute = false; 2465 // stackmap attribute - JDK1.5 2466 const u1* stackmap_data = NULL; 2467 int stackmap_data_length = 0; 2468 u2 generic_signature_index = 0; 2469 MethodAnnotationCollector parsed_annotations; 2470 const u1* runtime_visible_annotations = NULL; 2471 int runtime_visible_annotations_length = 0; 2472 const u1* runtime_invisible_annotations = NULL; 2473 int runtime_invisible_annotations_length = 0; 2474 const u1* runtime_visible_parameter_annotations = NULL; 2475 int runtime_visible_parameter_annotations_length = 0; 2476 const u1* runtime_invisible_parameter_annotations = NULL; 2477 int runtime_invisible_parameter_annotations_length = 0; 2478 const u1* runtime_visible_type_annotations = NULL; 2479 int runtime_visible_type_annotations_length = 0; 2480 const u1* runtime_invisible_type_annotations = NULL; 2481 int runtime_invisible_type_annotations_length = 0; 2482 bool runtime_invisible_annotations_exists = false; 2483 bool runtime_invisible_type_annotations_exists = false; 2484 bool runtime_invisible_parameter_annotations_exists = false; 2485 const u1* annotation_default = NULL; 2486 int annotation_default_length = 0; 2487 2488 // Parse code and exceptions attribute 2489 u2 method_attributes_count = cfs->get_u2_fast(); 2490 while (method_attributes_count--) { 2491 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2492 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2493 const u4 method_attribute_length = cfs->get_u4_fast(); 2494 check_property( 2495 valid_symbol_at(method_attribute_name_index), 2496 "Invalid method attribute name index %u in class file %s", 2497 method_attribute_name_index, CHECK_NULL); 2498 2499 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2500 if (method_attribute_name == vmSymbols::tag_code()) { 2501 // Parse Code attribute 2502 if (_need_verify) { 2503 guarantee_property( 2504 !access_flags.is_native() && !access_flags.is_abstract(), 2505 "Code attribute in native or abstract methods in class file %s", 2506 CHECK_NULL); 2507 } 2508 if (parsed_code_attribute) { 2509 classfile_parse_error("Multiple Code attributes in class file %s", 2510 CHECK_NULL); 2511 } 2512 parsed_code_attribute = true; 2513 2514 // Stack size, locals size, and code size 2515 if (_major_version == 45 && _minor_version <= 2) { 2516 cfs->guarantee_more(4, CHECK_NULL); 2517 max_stack = cfs->get_u1_fast(); 2518 max_locals = cfs->get_u1_fast(); 2519 code_length = cfs->get_u2_fast(); 2520 } else { 2521 cfs->guarantee_more(8, CHECK_NULL); 2522 max_stack = cfs->get_u2_fast(); 2523 max_locals = cfs->get_u2_fast(); 2524 code_length = cfs->get_u4_fast(); 2525 } 2526 if (_need_verify) { 2527 guarantee_property(args_size <= max_locals, 2528 "Arguments can't fit into locals in class file %s", 2529 CHECK_NULL); 2530 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2531 "Invalid method Code length %u in class file %s", 2532 code_length, CHECK_NULL); 2533 } 2534 // Code pointer 2535 code_start = cfs->current(); 2536 assert(code_start != NULL, "null code start"); 2537 cfs->guarantee_more(code_length, CHECK_NULL); 2538 cfs->skip_u1_fast(code_length); 2539 2540 // Exception handler table 2541 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2542 exception_table_length = cfs->get_u2_fast(); 2543 if (exception_table_length > 0) { 2544 exception_table_start = parse_exception_table(cfs, 2545 code_length, 2546 exception_table_length, 2547 CHECK_NULL); 2548 } 2549 2550 // Parse additional attributes in code attribute 2551 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2552 u2 code_attributes_count = cfs->get_u2_fast(); 2553 2554 unsigned int calculated_attribute_length = 0; 2555 2556 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2557 calculated_attribute_length = 2558 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2559 } else { 2560 // max_stack, locals and length are smaller in pre-version 45.2 classes 2561 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2562 } 2563 calculated_attribute_length += 2564 code_length + 2565 sizeof(exception_table_length) + 2566 sizeof(code_attributes_count) + 2567 exception_table_length * 2568 ( sizeof(u2) + // start_pc 2569 sizeof(u2) + // end_pc 2570 sizeof(u2) + // handler_pc 2571 sizeof(u2) ); // catch_type_index 2572 2573 while (code_attributes_count--) { 2574 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2575 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2576 const u4 code_attribute_length = cfs->get_u4_fast(); 2577 calculated_attribute_length += code_attribute_length + 2578 sizeof(code_attribute_name_index) + 2579 sizeof(code_attribute_length); 2580 check_property(valid_symbol_at(code_attribute_name_index), 2581 "Invalid code attribute name index %u in class file %s", 2582 code_attribute_name_index, 2583 CHECK_NULL); 2584 if (LoadLineNumberTables && 2585 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2586 // Parse and compress line number table 2587 parse_linenumber_table(code_attribute_length, 2588 code_length, 2589 &linenumber_table, 2590 CHECK_NULL); 2591 2592 } else if (LoadLocalVariableTables && 2593 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2594 // Parse local variable table 2595 if (!lvt_allocated) { 2596 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2597 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2598 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2599 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2600 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2601 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2602 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2603 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2604 lvt_allocated = true; 2605 } 2606 if (lvt_cnt == max_lvt_cnt) { 2607 max_lvt_cnt <<= 1; 2608 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2609 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2610 } 2611 localvariable_table_start[lvt_cnt] = 2612 parse_localvariable_table(cfs, 2613 code_length, 2614 max_locals, 2615 code_attribute_length, 2616 &localvariable_table_length[lvt_cnt], 2617 false, // is not LVTT 2618 CHECK_NULL); 2619 total_lvt_length += localvariable_table_length[lvt_cnt]; 2620 lvt_cnt++; 2621 } else if (LoadLocalVariableTypeTables && 2622 _major_version >= JAVA_1_5_VERSION && 2623 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2624 if (!lvt_allocated) { 2625 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2626 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2627 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2628 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2629 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2630 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2631 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2632 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2633 lvt_allocated = true; 2634 } 2635 // Parse local variable type table 2636 if (lvtt_cnt == max_lvtt_cnt) { 2637 max_lvtt_cnt <<= 1; 2638 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2639 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2640 } 2641 localvariable_type_table_start[lvtt_cnt] = 2642 parse_localvariable_table(cfs, 2643 code_length, 2644 max_locals, 2645 code_attribute_length, 2646 &localvariable_type_table_length[lvtt_cnt], 2647 true, // is LVTT 2648 CHECK_NULL); 2649 lvtt_cnt++; 2650 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2651 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2652 // Stack map is only needed by the new verifier in JDK1.5. 2653 if (parsed_stackmap_attribute) { 2654 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2655 } 2656 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2657 stackmap_data_length = code_attribute_length; 2658 parsed_stackmap_attribute = true; 2659 } else { 2660 // Skip unknown attributes 2661 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2662 } 2663 } 2664 // check method attribute length 2665 if (_need_verify) { 2666 guarantee_property(method_attribute_length == calculated_attribute_length, 2667 "Code segment has wrong length in class file %s", 2668 CHECK_NULL); 2669 } 2670 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2671 // Parse Exceptions attribute 2672 if (parsed_checked_exceptions_attribute) { 2673 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2674 CHECK_NULL); 2675 } 2676 parsed_checked_exceptions_attribute = true; 2677 checked_exceptions_start = 2678 parse_checked_exceptions(cfs, 2679 &checked_exceptions_length, 2680 method_attribute_length, 2681 CHECK_NULL); 2682 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2683 // reject multiple method parameters 2684 if (method_parameters_seen) { 2685 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2686 CHECK_NULL); 2687 } 2688 method_parameters_seen = true; 2689 method_parameters_length = cfs->get_u1_fast(); 2690 const u2 real_length = (method_parameters_length * 4u) + 1u; 2691 if (method_attribute_length != real_length) { 2692 classfile_parse_error( 2693 "Invalid MethodParameters method attribute length %u in class file", 2694 method_attribute_length, CHECK_NULL); 2695 } 2696 method_parameters_data = cfs->current(); 2697 cfs->skip_u2_fast(method_parameters_length); 2698 cfs->skip_u2_fast(method_parameters_length); 2699 // ignore this attribute if it cannot be reflected 2700 if (!SystemDictionary::Parameter_klass_loaded()) 2701 method_parameters_length = -1; 2702 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2703 if (method_attribute_length != 0) { 2704 classfile_parse_error( 2705 "Invalid Synthetic method attribute length %u in class file %s", 2706 method_attribute_length, CHECK_NULL); 2707 } 2708 // Should we check that there hasn't already been a synthetic attribute? 2709 access_flags.set_is_synthetic(); 2710 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2711 if (method_attribute_length != 0) { 2712 classfile_parse_error( 2713 "Invalid Deprecated method attribute length %u in class file %s", 2714 method_attribute_length, CHECK_NULL); 2715 } 2716 } else if (_major_version >= JAVA_1_5_VERSION) { 2717 if (method_attribute_name == vmSymbols::tag_signature()) { 2718 if (generic_signature_index != 0) { 2719 classfile_parse_error( 2720 "Multiple Signature attributes for method in class file %s", 2721 CHECK_NULL); 2722 } 2723 if (method_attribute_length != 2) { 2724 classfile_parse_error( 2725 "Invalid Signature attribute length %u in class file %s", 2726 method_attribute_length, CHECK_NULL); 2727 } 2728 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2729 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2730 if (runtime_visible_annotations != NULL) { 2731 classfile_parse_error( 2732 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2733 CHECK_NULL); 2734 } 2735 runtime_visible_annotations_length = method_attribute_length; 2736 runtime_visible_annotations = cfs->current(); 2737 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2738 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2739 parse_annotations(cp, 2740 runtime_visible_annotations, 2741 runtime_visible_annotations_length, 2742 &parsed_annotations, 2743 _loader_data, 2744 CHECK_NULL); 2745 cfs->skip_u1_fast(runtime_visible_annotations_length); 2746 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2747 if (runtime_invisible_annotations_exists) { 2748 classfile_parse_error( 2749 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2750 CHECK_NULL); 2751 } 2752 runtime_invisible_annotations_exists = true; 2753 if (PreserveAllAnnotations) { 2754 runtime_invisible_annotations_length = method_attribute_length; 2755 runtime_invisible_annotations = cfs->current(); 2756 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2757 } 2758 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2759 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2760 if (runtime_visible_parameter_annotations != NULL) { 2761 classfile_parse_error( 2762 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2763 CHECK_NULL); 2764 } 2765 runtime_visible_parameter_annotations_length = method_attribute_length; 2766 runtime_visible_parameter_annotations = cfs->current(); 2767 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2768 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2769 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2770 if (runtime_invisible_parameter_annotations_exists) { 2771 classfile_parse_error( 2772 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2773 CHECK_NULL); 2774 } 2775 runtime_invisible_parameter_annotations_exists = true; 2776 if (PreserveAllAnnotations) { 2777 runtime_invisible_parameter_annotations_length = method_attribute_length; 2778 runtime_invisible_parameter_annotations = cfs->current(); 2779 assert(runtime_invisible_parameter_annotations != NULL, 2780 "null invisible parameter annotations"); 2781 } 2782 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2783 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2784 if (annotation_default != NULL) { 2785 classfile_parse_error( 2786 "Multiple AnnotationDefault attributes for method in class file %s", 2787 CHECK_NULL); 2788 } 2789 annotation_default_length = method_attribute_length; 2790 annotation_default = cfs->current(); 2791 assert(annotation_default != NULL, "null annotation default"); 2792 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2793 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2794 if (runtime_visible_type_annotations != NULL) { 2795 classfile_parse_error( 2796 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2797 CHECK_NULL); 2798 } 2799 runtime_visible_type_annotations_length = method_attribute_length; 2800 runtime_visible_type_annotations = cfs->current(); 2801 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2802 // No need for the VM to parse Type annotations 2803 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2804 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2805 if (runtime_invisible_type_annotations_exists) { 2806 classfile_parse_error( 2807 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2808 CHECK_NULL); 2809 } else { 2810 runtime_invisible_type_annotations_exists = true; 2811 } 2812 if (PreserveAllAnnotations) { 2813 runtime_invisible_type_annotations_length = method_attribute_length; 2814 runtime_invisible_type_annotations = cfs->current(); 2815 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2816 } 2817 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2818 } else { 2819 // Skip unknown attributes 2820 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2821 } 2822 } else { 2823 // Skip unknown attributes 2824 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2825 } 2826 } 2827 2828 if (linenumber_table != NULL) { 2829 linenumber_table->write_terminator(); 2830 linenumber_table_length = linenumber_table->position(); 2831 } 2832 2833 // Make sure there's at least one Code attribute in non-native/non-abstract method 2834 if (_need_verify) { 2835 guarantee_property(access_flags.is_native() || 2836 access_flags.is_abstract() || 2837 parsed_code_attribute, 2838 "Absent Code attribute in method that is not native or abstract in class file %s", 2839 CHECK_NULL); 2840 } 2841 2842 // All sizing information for a Method* is finally available, now create it 2843 InlineTableSizes sizes( 2844 total_lvt_length, 2845 linenumber_table_length, 2846 exception_table_length, 2847 checked_exceptions_length, 2848 method_parameters_length, 2849 generic_signature_index, 2850 runtime_visible_annotations_length + 2851 runtime_invisible_annotations_length, 2852 runtime_visible_parameter_annotations_length + 2853 runtime_invisible_parameter_annotations_length, 2854 runtime_visible_type_annotations_length + 2855 runtime_invisible_type_annotations_length, 2856 annotation_default_length, 2857 0); 2858 2859 Method* const m = Method::allocate(_loader_data, 2860 code_length, 2861 access_flags, 2862 &sizes, 2863 ConstMethod::NORMAL, 2864 CHECK_NULL); 2865 2866 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2867 2868 // Fill in information from fixed part (access_flags already set) 2869 m->set_constants(_cp); 2870 m->set_name_index(name_index); 2871 m->set_signature_index(signature_index); 2872 2873 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 2874 m->constMethod()->set_result_type(rtf.type()); 2875 2876 if (args_size >= 0) { 2877 m->set_size_of_parameters(args_size); 2878 } else { 2879 m->compute_size_of_parameters(THREAD); 2880 } 2881 #ifdef ASSERT 2882 if (args_size >= 0) { 2883 m->compute_size_of_parameters(THREAD); 2884 assert(args_size == m->size_of_parameters(), ""); 2885 } 2886 #endif 2887 2888 // Fill in code attribute information 2889 m->set_max_stack(max_stack); 2890 m->set_max_locals(max_locals); 2891 if (stackmap_data != NULL) { 2892 m->constMethod()->copy_stackmap_data(_loader_data, 2893 (u1*)stackmap_data, 2894 stackmap_data_length, 2895 CHECK_NULL); 2896 } 2897 2898 // Copy byte codes 2899 m->set_code((u1*)code_start); 2900 2901 // Copy line number table 2902 if (linenumber_table != NULL) { 2903 memcpy(m->compressed_linenumber_table(), 2904 linenumber_table->buffer(), 2905 linenumber_table_length); 2906 } 2907 2908 // Copy exception table 2909 if (exception_table_length > 0) { 2910 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2911 m->exception_table_start(), 2912 exception_table_length * sizeof(ExceptionTableElement), 2913 sizeof(u2)); 2914 } 2915 2916 // Copy method parameters 2917 if (method_parameters_length > 0) { 2918 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2919 for (int i = 0; i < method_parameters_length; i++) { 2920 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2921 method_parameters_data += 2; 2922 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2923 method_parameters_data += 2; 2924 } 2925 } 2926 2927 // Copy checked exceptions 2928 if (checked_exceptions_length > 0) { 2929 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2930 m->checked_exceptions_start(), 2931 checked_exceptions_length * sizeof(CheckedExceptionElement), 2932 sizeof(u2)); 2933 } 2934 2935 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2936 if (total_lvt_length > 0) { 2937 promoted_flags->set_has_localvariable_table(); 2938 copy_localvariable_table(m->constMethod(), 2939 lvt_cnt, 2940 localvariable_table_length, 2941 localvariable_table_start, 2942 lvtt_cnt, 2943 localvariable_type_table_length, 2944 localvariable_type_table_start, 2945 CHECK_NULL); 2946 } 2947 2948 if (parsed_annotations.has_any_annotations()) 2949 parsed_annotations.apply_to(m); 2950 2951 // Copy annotations 2952 copy_method_annotations(m->constMethod(), 2953 runtime_visible_annotations, 2954 runtime_visible_annotations_length, 2955 runtime_invisible_annotations, 2956 runtime_invisible_annotations_length, 2957 runtime_visible_parameter_annotations, 2958 runtime_visible_parameter_annotations_length, 2959 runtime_invisible_parameter_annotations, 2960 runtime_invisible_parameter_annotations_length, 2961 runtime_visible_type_annotations, 2962 runtime_visible_type_annotations_length, 2963 runtime_invisible_type_annotations, 2964 runtime_invisible_type_annotations_length, 2965 annotation_default, 2966 annotation_default_length, 2967 CHECK_NULL); 2968 2969 if (name == vmSymbols::finalize_method_name() && 2970 signature == vmSymbols::void_method_signature()) { 2971 if (m->is_empty_method()) { 2972 _has_empty_finalizer = true; 2973 } else { 2974 _has_finalizer = true; 2975 } 2976 } 2977 if (name == vmSymbols::object_initializer_name() && 2978 signature == vmSymbols::void_method_signature() && 2979 m->is_vanilla_constructor()) { 2980 _has_vanilla_constructor = true; 2981 } 2982 2983 NOT_PRODUCT(m->verify()); 2984 return m; 2985 } 2986 2987 2988 // The promoted_flags parameter is used to pass relevant access_flags 2989 // from the methods back up to the containing klass. These flag values 2990 // are added to klass's access_flags. 2991 // Side-effects: populates the _methods field in the parser 2992 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2993 bool is_interface, 2994 AccessFlags* promoted_flags, 2995 bool* has_final_method, 2996 bool* declares_nonstatic_concrete_methods, 2997 TRAPS) { 2998 assert(cfs != NULL, "invariant"); 2999 assert(promoted_flags != NULL, "invariant"); 3000 assert(has_final_method != NULL, "invariant"); 3001 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 3002 3003 assert(NULL == _methods, "invariant"); 3004 3005 cfs->guarantee_more(2, CHECK); // length 3006 const u2 length = cfs->get_u2_fast(); 3007 if (length == 0) { 3008 _methods = Universe::the_empty_method_array(); 3009 } else { 3010 _methods = MetadataFactory::new_array<Method*>(_loader_data, 3011 length, 3012 NULL, 3013 CHECK); 3014 3015 for (int index = 0; index < length; index++) { 3016 Method* method = parse_method(cfs, 3017 is_interface, 3018 _cp, 3019 promoted_flags, 3020 CHECK); 3021 3022 if (method->is_final()) { 3023 *has_final_method = true; 3024 } 3025 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 3026 // used for interface initialization, and default method inheritance analysis 3027 if (is_interface && !(*declares_nonstatic_concrete_methods) 3028 && !method->is_abstract() && !method->is_static()) { 3029 *declares_nonstatic_concrete_methods = true; 3030 } 3031 _methods->at_put(index, method); 3032 } 3033 3034 if (_need_verify && length > 1) { 3035 // Check duplicated methods 3036 ResourceMark rm(THREAD); 3037 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 3038 THREAD, NameSigHash*, HASH_ROW_SIZE); 3039 initialize_hashtable(names_and_sigs); 3040 bool dup = false; 3041 const Symbol* name = NULL; 3042 const Symbol* sig = NULL; 3043 { 3044 debug_only(NoSafepointVerifier nsv;) 3045 for (int i = 0; i < length; i++) { 3046 const Method* const m = _methods->at(i); 3047 name = m->name(); 3048 sig = m->signature(); 3049 // If no duplicates, add name/signature in hashtable names_and_sigs. 3050 if (!put_after_lookup(name, sig, names_and_sigs)) { 3051 dup = true; 3052 break; 3053 } 3054 } 3055 } 3056 if (dup) { 3057 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 3058 name->as_C_string(), sig->as_klass_external_name(), CHECK); 3059 } 3060 } 3061 } 3062 } 3063 3064 static const intArray* sort_methods(Array<Method*>* methods) { 3065 const int length = methods->length(); 3066 // If JVMTI original method ordering or sharing is enabled we have to 3067 // remember the original class file ordering. 3068 // We temporarily use the vtable_index field in the Method* to store the 3069 // class file index, so we can read in after calling qsort. 3070 // Put the method ordering in the shared archive. 3071 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3072 for (int index = 0; index < length; index++) { 3073 Method* const m = methods->at(index); 3074 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3075 m->set_vtable_index(index); 3076 } 3077 } 3078 // Sort method array by ascending method name (for faster lookups & vtable construction) 3079 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3080 Method::sort_methods(methods); 3081 3082 intArray* method_ordering = NULL; 3083 // If JVMTI original method ordering or sharing is enabled construct int 3084 // array remembering the original ordering 3085 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3086 method_ordering = new intArray(length, length, -1); 3087 for (int index = 0; index < length; index++) { 3088 Method* const m = methods->at(index); 3089 const int old_index = m->vtable_index(); 3090 assert(old_index >= 0 && old_index < length, "invalid method index"); 3091 method_ordering->at_put(index, old_index); 3092 m->set_vtable_index(Method::invalid_vtable_index); 3093 } 3094 } 3095 return method_ordering; 3096 } 3097 3098 // Parse generic_signature attribute for methods and fields 3099 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3100 TRAPS) { 3101 assert(cfs != NULL, "invariant"); 3102 3103 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3104 const u2 generic_signature_index = cfs->get_u2_fast(); 3105 check_property( 3106 valid_symbol_at(generic_signature_index), 3107 "Invalid Signature attribute at constant pool index %u in class file %s", 3108 generic_signature_index, CHECK_0); 3109 return generic_signature_index; 3110 } 3111 3112 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3113 TRAPS) { 3114 3115 assert(cfs != NULL, "invariant"); 3116 3117 cfs->guarantee_more(2, CHECK); // sourcefile_index 3118 const u2 sourcefile_index = cfs->get_u2_fast(); 3119 check_property( 3120 valid_symbol_at(sourcefile_index), 3121 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3122 sourcefile_index, CHECK); 3123 set_class_sourcefile_index(sourcefile_index); 3124 } 3125 3126 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3127 int length, 3128 TRAPS) { 3129 assert(cfs != NULL, "invariant"); 3130 3131 const u1* const sde_buffer = cfs->current(); 3132 assert(sde_buffer != NULL, "null sde buffer"); 3133 3134 // Don't bother storing it if there is no way to retrieve it 3135 if (JvmtiExport::can_get_source_debug_extension()) { 3136 assert((length+1) > length, "Overflow checking"); 3137 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3138 for (int i = 0; i < length; i++) { 3139 sde[i] = sde_buffer[i]; 3140 } 3141 sde[length] = '\0'; 3142 set_class_sde_buffer((const char*)sde, length); 3143 } 3144 // Got utf8 string, set stream position forward 3145 cfs->skip_u1(length, CHECK); 3146 } 3147 3148 3149 // Inner classes can be static, private or protected (classic VM does this) 3150 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3151 JVM_ACC_PRIVATE | \ 3152 JVM_ACC_PROTECTED | \ 3153 JVM_ACC_STATIC \ 3154 ) 3155 3156 // Return number of classes in the inner classes attribute table 3157 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3158 const u1* const inner_classes_attribute_start, 3159 bool parsed_enclosingmethod_attribute, 3160 u2 enclosing_method_class_index, 3161 u2 enclosing_method_method_index, 3162 TRAPS) { 3163 const u1* const current_mark = cfs->current(); 3164 u2 length = 0; 3165 if (inner_classes_attribute_start != NULL) { 3166 cfs->set_current(inner_classes_attribute_start); 3167 cfs->guarantee_more(2, CHECK_0); // length 3168 length = cfs->get_u2_fast(); 3169 } 3170 3171 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3172 // method data: 3173 // [inner_class_info_index, 3174 // outer_class_info_index, 3175 // inner_name_index, 3176 // inner_class_access_flags, 3177 // ... 3178 // enclosing_method_class_index, 3179 // enclosing_method_method_index] 3180 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3181 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3182 _inner_classes = inner_classes; 3183 3184 int index = 0; 3185 const int cp_size = _cp->length(); 3186 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3187 for (int n = 0; n < length; n++) { 3188 // Inner class index 3189 const u2 inner_class_info_index = cfs->get_u2_fast(); 3190 check_property( 3191 (valid_klass_reference_at(inner_class_info_index) || 3192 (EnableValhalla && valid_value_type_reference_at(inner_class_info_index))), 3193 "inner_class_info_index %u has bad constant type in class file %s", 3194 inner_class_info_index, CHECK_0); 3195 // Outer class index 3196 const u2 outer_class_info_index = cfs->get_u2_fast(); 3197 check_property( 3198 outer_class_info_index == 0 || 3199 (valid_klass_reference_at(outer_class_info_index) || 3200 (EnableValhalla && valid_value_type_reference_at(outer_class_info_index))), 3201 "outer_class_info_index %u has bad constant type in class file %s", 3202 outer_class_info_index, CHECK_0); 3203 // Inner class name 3204 const u2 inner_name_index = cfs->get_u2_fast(); 3205 check_property( 3206 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3207 "inner_name_index %u has bad constant type in class file %s", 3208 inner_name_index, CHECK_0); 3209 if (_need_verify) { 3210 guarantee_property(inner_class_info_index != outer_class_info_index, 3211 "Class is both outer and inner class in class file %s", CHECK_0); 3212 } 3213 3214 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS; 3215 // JVM_ACC_MODULE is defined in JDK-9 and later. 3216 if (_major_version >= JAVA_9_VERSION) { 3217 recognized_modifiers |= JVM_ACC_MODULE; 3218 } 3219 // JVM_ACC_VALUE is defined for class file version 53.1 and later 3220 if (supports_value_types()) { 3221 recognized_modifiers |= JVM_ACC_VALUE; 3222 } 3223 3224 // Access flags 3225 jint flags = cfs->get_u2_fast() & recognized_modifiers; 3226 3227 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3228 // Set abstract bit for old class files for backward compatibility 3229 flags |= JVM_ACC_ABSTRACT; 3230 } 3231 verify_legal_class_modifiers(flags, CHECK_0); 3232 AccessFlags inner_access_flags(flags); 3233 3234 inner_classes->at_put(index++, inner_class_info_index); 3235 inner_classes->at_put(index++, outer_class_info_index); 3236 inner_classes->at_put(index++, inner_name_index); 3237 inner_classes->at_put(index++, inner_access_flags.as_short()); 3238 } 3239 3240 // 4347400: make sure there's no duplicate entry in the classes array 3241 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3242 for(int i = 0; i < length * 4; i += 4) { 3243 for(int j = i + 4; j < length * 4; j += 4) { 3244 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3245 inner_classes->at(i+1) != inner_classes->at(j+1) || 3246 inner_classes->at(i+2) != inner_classes->at(j+2) || 3247 inner_classes->at(i+3) != inner_classes->at(j+3)), 3248 "Duplicate entry in InnerClasses in class file %s", 3249 CHECK_0); 3250 } 3251 } 3252 } 3253 3254 // Set EnclosingMethod class and method indexes. 3255 if (parsed_enclosingmethod_attribute) { 3256 inner_classes->at_put(index++, enclosing_method_class_index); 3257 inner_classes->at_put(index++, enclosing_method_method_index); 3258 } 3259 assert(index == size, "wrong size"); 3260 3261 // Restore buffer's current position. 3262 cfs->set_current(current_mark); 3263 3264 return length; 3265 } 3266 3267 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3268 set_class_synthetic_flag(true); 3269 } 3270 3271 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3272 assert(cfs != NULL, "invariant"); 3273 3274 const u2 signature_index = cfs->get_u2(CHECK); 3275 check_property( 3276 valid_symbol_at(signature_index), 3277 "Invalid constant pool index %u in Signature attribute in class file %s", 3278 signature_index, CHECK); 3279 set_class_generic_signature_index(signature_index); 3280 } 3281 3282 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3283 ConstantPool* cp, 3284 u4 attribute_byte_length, 3285 TRAPS) { 3286 assert(cfs != NULL, "invariant"); 3287 assert(cp != NULL, "invariant"); 3288 3289 const u1* const current_start = cfs->current(); 3290 3291 guarantee_property(attribute_byte_length >= sizeof(u2), 3292 "Invalid BootstrapMethods attribute length %u in class file %s", 3293 attribute_byte_length, 3294 CHECK); 3295 3296 cfs->guarantee_more(attribute_byte_length, CHECK); 3297 3298 const int attribute_array_length = cfs->get_u2_fast(); 3299 3300 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3301 "Short length on BootstrapMethods in class file %s", 3302 CHECK); 3303 3304 3305 // The attribute contains a counted array of counted tuples of shorts, 3306 // represending bootstrap specifiers: 3307 // length*{bootstrap_method_index, argument_count*{argument_index}} 3308 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3309 // operand_count = number of shorts in attr, except for leading length 3310 3311 // The attribute is copied into a short[] array. 3312 // The array begins with a series of short[2] pairs, one for each tuple. 3313 const int index_size = (attribute_array_length * 2); 3314 3315 Array<u2>* const operands = 3316 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3317 3318 // Eagerly assign operands so they will be deallocated with the constant 3319 // pool if there is an error. 3320 cp->set_operands(operands); 3321 3322 int operand_fill_index = index_size; 3323 const int cp_size = cp->length(); 3324 3325 for (int n = 0; n < attribute_array_length; n++) { 3326 // Store a 32-bit offset into the header of the operand array. 3327 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3328 3329 // Read a bootstrap specifier. 3330 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3331 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3332 const u2 argument_count = cfs->get_u2_fast(); 3333 check_property( 3334 valid_cp_range(bootstrap_method_index, cp_size) && 3335 cp->tag_at(bootstrap_method_index).is_method_handle(), 3336 "bootstrap_method_index %u has bad constant type in class file %s", 3337 bootstrap_method_index, 3338 CHECK); 3339 3340 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3341 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3342 CHECK); 3343 3344 operands->at_put(operand_fill_index++, bootstrap_method_index); 3345 operands->at_put(operand_fill_index++, argument_count); 3346 3347 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3348 for (int j = 0; j < argument_count; j++) { 3349 const u2 argument_index = cfs->get_u2_fast(); 3350 check_property( 3351 valid_cp_range(argument_index, cp_size) && 3352 cp->tag_at(argument_index).is_loadable_constant(), 3353 "argument_index %u has bad constant type in class file %s", 3354 argument_index, 3355 CHECK); 3356 operands->at_put(operand_fill_index++, argument_index); 3357 } 3358 } 3359 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3360 "Bad length on BootstrapMethods in class file %s", 3361 CHECK); 3362 } 3363 3364 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3365 ConstantPool* cp, 3366 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3367 TRAPS) { 3368 assert(cfs != NULL, "invariant"); 3369 assert(cp != NULL, "invariant"); 3370 assert(parsed_annotations != NULL, "invariant"); 3371 3372 // Set inner classes attribute to default sentinel 3373 _inner_classes = Universe::the_empty_short_array(); 3374 cfs->guarantee_more(2, CHECK); // attributes_count 3375 u2 attributes_count = cfs->get_u2_fast(); 3376 bool parsed_sourcefile_attribute = false; 3377 bool parsed_innerclasses_attribute = false; 3378 bool parsed_enclosingmethod_attribute = false; 3379 bool parsed_bootstrap_methods_attribute = false; 3380 const u1* runtime_visible_annotations = NULL; 3381 int runtime_visible_annotations_length = 0; 3382 const u1* runtime_invisible_annotations = NULL; 3383 int runtime_invisible_annotations_length = 0; 3384 const u1* runtime_visible_type_annotations = NULL; 3385 int runtime_visible_type_annotations_length = 0; 3386 const u1* runtime_invisible_type_annotations = NULL; 3387 int runtime_invisible_type_annotations_length = 0; 3388 bool runtime_invisible_type_annotations_exists = false; 3389 bool runtime_invisible_annotations_exists = false; 3390 bool parsed_source_debug_ext_annotations_exist = false; 3391 const u1* inner_classes_attribute_start = NULL; 3392 u4 inner_classes_attribute_length = 0; 3393 u2 enclosing_method_class_index = 0; 3394 u2 enclosing_method_method_index = 0; 3395 // Iterate over attributes 3396 while (attributes_count--) { 3397 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3398 const u2 attribute_name_index = cfs->get_u2_fast(); 3399 const u4 attribute_length = cfs->get_u4_fast(); 3400 check_property( 3401 valid_symbol_at(attribute_name_index), 3402 "Attribute name has bad constant pool index %u in class file %s", 3403 attribute_name_index, CHECK); 3404 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3405 if (tag == vmSymbols::tag_source_file()) { 3406 // Check for SourceFile tag 3407 if (_need_verify) { 3408 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3409 } 3410 if (parsed_sourcefile_attribute) { 3411 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3412 } else { 3413 parsed_sourcefile_attribute = true; 3414 } 3415 parse_classfile_sourcefile_attribute(cfs, CHECK); 3416 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3417 // Check for SourceDebugExtension tag 3418 if (parsed_source_debug_ext_annotations_exist) { 3419 classfile_parse_error( 3420 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3421 } 3422 parsed_source_debug_ext_annotations_exist = true; 3423 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3424 } else if (tag == vmSymbols::tag_inner_classes()) { 3425 // Check for InnerClasses tag 3426 if (parsed_innerclasses_attribute) { 3427 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3428 } else { 3429 parsed_innerclasses_attribute = true; 3430 } 3431 inner_classes_attribute_start = cfs->current(); 3432 inner_classes_attribute_length = attribute_length; 3433 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3434 } else if (tag == vmSymbols::tag_synthetic()) { 3435 // Check for Synthetic tag 3436 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3437 if (attribute_length != 0) { 3438 classfile_parse_error( 3439 "Invalid Synthetic classfile attribute length %u in class file %s", 3440 attribute_length, CHECK); 3441 } 3442 parse_classfile_synthetic_attribute(CHECK); 3443 } else if (tag == vmSymbols::tag_deprecated()) { 3444 // Check for Deprecatd tag - 4276120 3445 if (attribute_length != 0) { 3446 classfile_parse_error( 3447 "Invalid Deprecated classfile attribute length %u in class file %s", 3448 attribute_length, CHECK); 3449 } 3450 } else if (_major_version >= JAVA_1_5_VERSION) { 3451 if (tag == vmSymbols::tag_signature()) { 3452 if (_generic_signature_index != 0) { 3453 classfile_parse_error( 3454 "Multiple Signature attributes in class file %s", CHECK); 3455 } 3456 if (attribute_length != 2) { 3457 classfile_parse_error( 3458 "Wrong Signature attribute length %u in class file %s", 3459 attribute_length, CHECK); 3460 } 3461 parse_classfile_signature_attribute(cfs, CHECK); 3462 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3463 if (runtime_visible_annotations != NULL) { 3464 classfile_parse_error( 3465 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3466 } 3467 runtime_visible_annotations_length = attribute_length; 3468 runtime_visible_annotations = cfs->current(); 3469 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3470 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3471 parse_annotations(cp, 3472 runtime_visible_annotations, 3473 runtime_visible_annotations_length, 3474 parsed_annotations, 3475 _loader_data, 3476 CHECK); 3477 cfs->skip_u1_fast(runtime_visible_annotations_length); 3478 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3479 if (runtime_invisible_annotations_exists) { 3480 classfile_parse_error( 3481 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3482 } 3483 runtime_invisible_annotations_exists = true; 3484 if (PreserveAllAnnotations) { 3485 runtime_invisible_annotations_length = attribute_length; 3486 runtime_invisible_annotations = cfs->current(); 3487 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3488 } 3489 cfs->skip_u1(attribute_length, CHECK); 3490 } else if (tag == vmSymbols::tag_enclosing_method()) { 3491 if (parsed_enclosingmethod_attribute) { 3492 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3493 } else { 3494 parsed_enclosingmethod_attribute = true; 3495 } 3496 guarantee_property(attribute_length == 4, 3497 "Wrong EnclosingMethod attribute length %u in class file %s", 3498 attribute_length, CHECK); 3499 cfs->guarantee_more(4, CHECK); // class_index, method_index 3500 enclosing_method_class_index = cfs->get_u2_fast(); 3501 enclosing_method_method_index = cfs->get_u2_fast(); 3502 if (enclosing_method_class_index == 0) { 3503 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3504 } 3505 // Validate the constant pool indices and types 3506 check_property(valid_klass_reference_at(enclosing_method_class_index), 3507 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3508 if (enclosing_method_method_index != 0 && 3509 (!cp->is_within_bounds(enclosing_method_method_index) || 3510 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3511 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3512 } 3513 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3514 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3515 if (parsed_bootstrap_methods_attribute) { 3516 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3517 } 3518 parsed_bootstrap_methods_attribute = true; 3519 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3520 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3521 if (runtime_visible_type_annotations != NULL) { 3522 classfile_parse_error( 3523 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3524 } 3525 runtime_visible_type_annotations_length = attribute_length; 3526 runtime_visible_type_annotations = cfs->current(); 3527 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3528 // No need for the VM to parse Type annotations 3529 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3530 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3531 if (runtime_invisible_type_annotations_exists) { 3532 classfile_parse_error( 3533 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3534 } else { 3535 runtime_invisible_type_annotations_exists = true; 3536 } 3537 if (PreserveAllAnnotations) { 3538 runtime_invisible_type_annotations_length = attribute_length; 3539 runtime_invisible_type_annotations = cfs->current(); 3540 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3541 } 3542 cfs->skip_u1(attribute_length, CHECK); 3543 } else { 3544 // Unknown attribute 3545 cfs->skip_u1(attribute_length, CHECK); 3546 } 3547 } else { 3548 // Unknown attribute 3549 cfs->skip_u1(attribute_length, CHECK); 3550 } 3551 } 3552 _annotations = assemble_annotations(runtime_visible_annotations, 3553 runtime_visible_annotations_length, 3554 runtime_invisible_annotations, 3555 runtime_invisible_annotations_length, 3556 CHECK); 3557 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3558 runtime_visible_type_annotations_length, 3559 runtime_invisible_type_annotations, 3560 runtime_invisible_type_annotations_length, 3561 CHECK); 3562 3563 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3564 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3565 cfs, 3566 inner_classes_attribute_start, 3567 parsed_innerclasses_attribute, 3568 enclosing_method_class_index, 3569 enclosing_method_method_index, 3570 CHECK); 3571 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3572 guarantee_property( 3573 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3574 "Wrong InnerClasses attribute length in class file %s", CHECK); 3575 } 3576 } 3577 3578 if (_max_bootstrap_specifier_index >= 0) { 3579 guarantee_property(parsed_bootstrap_methods_attribute, 3580 "Missing BootstrapMethods attribute in class file %s", CHECK); 3581 } 3582 } 3583 3584 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3585 assert(k != NULL, "invariant"); 3586 3587 if (_synthetic_flag) 3588 k->set_is_synthetic(); 3589 if (_sourcefile_index != 0) { 3590 k->set_source_file_name_index(_sourcefile_index); 3591 } 3592 if (_generic_signature_index != 0) { 3593 k->set_generic_signature_index(_generic_signature_index); 3594 } 3595 if (_sde_buffer != NULL) { 3596 k->set_source_debug_extension(_sde_buffer, _sde_length); 3597 } 3598 } 3599 3600 // Create the Annotations object that will 3601 // hold the annotations array for the Klass. 3602 void ClassFileParser::create_combined_annotations(TRAPS) { 3603 if (_annotations == NULL && 3604 _type_annotations == NULL && 3605 _fields_annotations == NULL && 3606 _fields_type_annotations == NULL) { 3607 // Don't create the Annotations object unnecessarily. 3608 return; 3609 } 3610 3611 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3612 annotations->set_class_annotations(_annotations); 3613 annotations->set_class_type_annotations(_type_annotations); 3614 annotations->set_fields_annotations(_fields_annotations); 3615 annotations->set_fields_type_annotations(_fields_type_annotations); 3616 3617 // This is the Annotations object that will be 3618 // assigned to InstanceKlass being constructed. 3619 _combined_annotations = annotations; 3620 3621 // The annotations arrays below has been transfered the 3622 // _combined_annotations so these fields can now be cleared. 3623 _annotations = NULL; 3624 _type_annotations = NULL; 3625 _fields_annotations = NULL; 3626 _fields_type_annotations = NULL; 3627 } 3628 3629 // Transfer ownership of metadata allocated to the InstanceKlass. 3630 void ClassFileParser::apply_parsed_class_metadata( 3631 InstanceKlass* this_klass, 3632 int java_fields_count, TRAPS) { 3633 assert(this_klass != NULL, "invariant"); 3634 3635 _cp->set_pool_holder(this_klass); 3636 this_klass->set_constants(_cp); 3637 this_klass->set_fields(_fields, java_fields_count); 3638 this_klass->set_methods(_methods); 3639 this_klass->set_inner_classes(_inner_classes); 3640 this_klass->set_local_interfaces(_local_interfaces); 3641 this_klass->set_transitive_interfaces(_transitive_interfaces); 3642 this_klass->set_annotations(_combined_annotations); 3643 3644 // Clear out these fields so they don't get deallocated by the destructor 3645 clear_class_metadata(); 3646 } 3647 3648 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3649 int runtime_visible_annotations_length, 3650 const u1* const runtime_invisible_annotations, 3651 int runtime_invisible_annotations_length, 3652 TRAPS) { 3653 AnnotationArray* annotations = NULL; 3654 if (runtime_visible_annotations != NULL || 3655 runtime_invisible_annotations != NULL) { 3656 annotations = MetadataFactory::new_array<u1>(_loader_data, 3657 runtime_visible_annotations_length + 3658 runtime_invisible_annotations_length, 3659 CHECK_(annotations)); 3660 if (runtime_visible_annotations != NULL) { 3661 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3662 annotations->at_put(i, runtime_visible_annotations[i]); 3663 } 3664 } 3665 if (runtime_invisible_annotations != NULL) { 3666 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3667 int append = runtime_visible_annotations_length+i; 3668 annotations->at_put(append, runtime_invisible_annotations[i]); 3669 } 3670 } 3671 } 3672 return annotations; 3673 } 3674 3675 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3676 const int super_class_index, 3677 const bool need_verify, 3678 TRAPS) { 3679 assert(cp != NULL, "invariant"); 3680 const InstanceKlass* super_klass = NULL; 3681 3682 if (super_class_index == 0) { 3683 check_property(_class_name == vmSymbols::java_lang_Object() 3684 || (_access_flags.get_flags() & JVM_ACC_VALUE), 3685 "Invalid superclass index %u in class file %s", 3686 super_class_index, 3687 CHECK_NULL); 3688 } else { 3689 check_property((valid_klass_reference_at(super_class_index) || 3690 ((EnableValhalla || EnableMVT) && valid_value_type_reference_at(super_class_index))), 3691 "Invalid superclass index %u in class file %s", 3692 super_class_index, 3693 CHECK_NULL); 3694 // The class name should be legal because it is checked when parsing constant pool. 3695 // However, make sure it is not an array type. 3696 bool is_array = false; 3697 if (cp->tag_at(super_class_index).is_klass() || cp->tag_at(super_class_index).is_value_type()) { 3698 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3699 if (need_verify) 3700 is_array = super_klass->is_array_klass(); 3701 } else if (need_verify) { 3702 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3703 } 3704 if (need_verify) { 3705 guarantee_property(!is_array, 3706 "Bad superclass name in class file %s", CHECK_NULL); 3707 } 3708 } 3709 return super_klass; 3710 } 3711 3712 #ifndef PRODUCT 3713 static void print_field_layout(const Symbol* name, 3714 Array<u2>* fields, 3715 const constantPoolHandle& cp, 3716 int instance_size, 3717 int instance_fields_start, 3718 int instance_fields_end, 3719 int static_fields_end) { 3720 3721 assert(name != NULL, "invariant"); 3722 3723 tty->print("%s: field layout\n", name->as_klass_external_name()); 3724 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3725 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3726 if (!fs.access_flags().is_static()) { 3727 tty->print(" @%3d \"%s\" %s\n", 3728 fs.offset(), 3729 fs.name()->as_klass_external_name(), 3730 fs.signature()->as_klass_external_name()); 3731 } 3732 } 3733 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3734 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3735 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3736 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3737 if (fs.access_flags().is_static()) { 3738 tty->print(" @%3d \"%s\" %s\n", 3739 fs.offset(), 3740 fs.name()->as_klass_external_name(), 3741 fs.signature()->as_klass_external_name()); 3742 } 3743 } 3744 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 3745 tty->print("\n"); 3746 } 3747 #endif 3748 3749 // Values needed for oopmap and InstanceKlass creation 3750 class ClassFileParser::FieldLayoutInfo : public ResourceObj { 3751 public: 3752 OopMapBlocksBuilder* oop_map_blocks; 3753 int instance_size; 3754 int nonstatic_field_size; 3755 int static_field_size; 3756 bool has_nonstatic_fields; 3757 }; 3758 3759 // Utility to collect and compact oop maps during layout 3760 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj { 3761 public: 3762 OopMapBlock* nonstatic_oop_maps; 3763 unsigned int nonstatic_oop_map_count; 3764 unsigned int max_nonstatic_oop_maps; 3765 3766 public: 3767 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) { 3768 max_nonstatic_oop_maps = max_blocks; 3769 nonstatic_oop_map_count = 0; 3770 if (max_blocks == 0) { 3771 nonstatic_oop_maps = NULL; 3772 } else { 3773 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD( 3774 THREAD, OopMapBlock, max_nonstatic_oop_maps); 3775 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); 3776 } 3777 } 3778 3779 OopMapBlock* last_oop_map() const { 3780 assert(nonstatic_oop_map_count > 0, "Has no oop maps"); 3781 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1); 3782 } 3783 3784 // addition of super oop maps 3785 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { 3786 assert(nof_blocks && nonstatic_oop_map_count == 0 && 3787 nof_blocks <= max_nonstatic_oop_maps, "invariant"); 3788 3789 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); 3790 nonstatic_oop_map_count += nof_blocks; 3791 } 3792 3793 // collection of oops 3794 void add(int offset, int count) { 3795 if (nonstatic_oop_map_count == 0) { 3796 nonstatic_oop_map_count++; 3797 } 3798 OopMapBlock* nonstatic_oop_map = last_oop_map(); 3799 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up 3800 nonstatic_oop_map->set_offset(offset); 3801 nonstatic_oop_map->set_count(count); 3802 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add 3803 nonstatic_oop_map->increment_count(count); 3804 } else { // Need a new one... 3805 nonstatic_oop_map_count++; 3806 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check"); 3807 nonstatic_oop_map = last_oop_map(); 3808 nonstatic_oop_map->set_offset(offset); 3809 nonstatic_oop_map->set_count(count); 3810 } 3811 } 3812 3813 // general purpose copy, e.g. into allocated instanceKlass 3814 void copy(OopMapBlock* dst) { 3815 if (nonstatic_oop_map_count != 0) { 3816 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count); 3817 } 3818 } 3819 3820 // Sort and compact adjacent blocks 3821 void compact(TRAPS) { 3822 if (nonstatic_oop_map_count <= 1) { 3823 return; 3824 } 3825 /* 3826 * Since field layout sneeks in oops before values, we will be able to condense 3827 * blocks. There is potential to compact between super, own refs and values 3828 * containing refs. 3829 * 3830 * Currently compaction is slightly limited due to values being 8 byte aligned. 3831 * This may well change: FixMe if doesn't, the code below is fairly general purpose 3832 * and maybe it doesn't need to be. 3833 */ 3834 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock), 3835 (_sort_Fn)OopMapBlock::compare_offset); 3836 if (nonstatic_oop_map_count < 2) { 3837 return; 3838 } 3839 3840 //Make a temp copy, and iterate through and copy back into the orig 3841 ResourceMark rm(THREAD); 3842 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock, 3843 nonstatic_oop_map_count); 3844 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count; 3845 copy(oop_maps_copy); 3846 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps; 3847 unsigned int new_count = 1; 3848 oop_maps_copy++; 3849 while(oop_maps_copy < oop_maps_copy_end) { 3850 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); 3851 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { 3852 nonstatic_oop_map->increment_count(oop_maps_copy->count()); 3853 } else { 3854 nonstatic_oop_map++; 3855 new_count++; 3856 nonstatic_oop_map->set_offset(oop_maps_copy->offset()); 3857 nonstatic_oop_map->set_count(oop_maps_copy->count()); 3858 } 3859 oop_maps_copy++; 3860 } 3861 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?"); 3862 nonstatic_oop_map_count = new_count; 3863 } 3864 3865 void print_on(outputStream* st) const { 3866 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps); 3867 if (nonstatic_oop_map_count > 0) { 3868 OopMapBlock* map = nonstatic_oop_maps; 3869 OopMapBlock* last_map = last_oop_map(); 3870 assert(map <= last_map, "Last less than first"); 3871 while (map <= last_map) { 3872 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), 3873 map->offset() + map->offset_span() - heapOopSize, map->count()); 3874 map++; 3875 } 3876 } 3877 } 3878 3879 void print_value_on(outputStream* st) const { 3880 print_on(st); 3881 } 3882 3883 }; 3884 3885 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL, 3886 const char* msg, 3887 const Symbol* name, 3888 const Symbol* sig) const { 3889 3890 ResourceMark rm(THREAD); 3891 if (name == NULL || sig == NULL) { 3892 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS, 3893 vmSymbols::java_lang_ClassFormatError(), 3894 "class: %s - %s", _class_name->as_C_string(), msg); 3895 } 3896 else { 3897 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS, 3898 vmSymbols::java_lang_ClassFormatError(), 3899 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(), 3900 _class_name->as_C_string(), msg); 3901 } 3902 } 3903 3904 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3905 void ClassFileParser::layout_fields(ConstantPool* cp, 3906 const FieldAllocationCount* fac, 3907 const ClassAnnotationCollector* parsed_annotations, 3908 FieldLayoutInfo* info, 3909 TRAPS) { 3910 3911 assert(cp != NULL, "invariant"); 3912 3913 // Field size and offset computation 3914 int nonstatic_field_size = _super_klass == NULL ? 0 : 3915 _super_klass->nonstatic_field_size(); 3916 int next_nonstatic_valuetype_offset = 0; 3917 int first_nonstatic_valuetype_offset = 0; 3918 3919 // Fields that are value types are handled differently depending if they are static or not: 3920 // - static fields are oops 3921 // - non-static fields are embedded 3922 3923 // Count the contended fields by type. 3924 // 3925 // We ignore static fields, because @Contended is not supported for them. 3926 // The layout code below will also ignore the static fields. 3927 int nonstatic_contended_count = 0; 3928 FieldAllocationCount fac_contended; 3929 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 3930 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3931 if (fs.is_contended()) { 3932 fac_contended.count[atype]++; 3933 if (!fs.access_flags().is_static()) { 3934 nonstatic_contended_count++; 3935 } 3936 } 3937 } 3938 3939 3940 // Calculate the starting byte offsets 3941 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3942 // Value types in static fields are not embedded, they are handled with oops 3943 int next_static_double_offset = next_static_oop_offset + 3944 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize); 3945 if ( fac->count[STATIC_DOUBLE] && 3946 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3947 Universe::field_type_should_be_aligned(T_LONG)) ) { 3948 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 3949 } 3950 3951 int next_static_word_offset = next_static_double_offset + 3952 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3953 int next_static_short_offset = next_static_word_offset + 3954 ((fac->count[STATIC_WORD]) * BytesPerInt); 3955 int next_static_byte_offset = next_static_short_offset + 3956 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3957 3958 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3959 nonstatic_field_size * heapOopSize; 3960 3961 // First field of value types is aligned on a long boundary in order to ease 3962 // in-lining of value types (with header removal) in packed arrays and 3963 // flatten value types 3964 int initial_value_type_padding = 0; 3965 if (is_value_type()) { 3966 int old = nonstatic_fields_start; 3967 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong); 3968 initial_value_type_padding = nonstatic_fields_start - old; 3969 } 3970 3971 int next_nonstatic_field_offset = nonstatic_fields_start; 3972 3973 const bool is_contended_class = parsed_annotations->is_contended(); 3974 3975 // Class is contended, pad before all the fields 3976 if (is_contended_class) { 3977 next_nonstatic_field_offset += ContendedPaddingWidth; 3978 } 3979 3980 // Temporary value types restrictions 3981 if (is_value_type()) { 3982 if (is_contended_class) { 3983 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet"); 3984 return; 3985 } 3986 } 3987 3988 // Compute the non-contended fields count. 3989 // The packing code below relies on these counts to determine if some field 3990 // can be squeezed into the alignment gap. Contended fields are obviously 3991 // exempt from that. 3992 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3993 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3994 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3995 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3996 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3997 3998 int static_value_type_count = 0; 3999 int nonstatic_value_type_count = 0; 4000 int* nonstatic_value_type_indexes = NULL; 4001 Klass** nonstatic_value_type_klasses = NULL; 4002 unsigned int value_type_oop_map_count = 0; 4003 int not_flattened_value_types = 0; 4004 4005 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1; 4006 4007 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int, 4008 max_nonstatic_value_type); 4009 for (int i = 0; i < max_nonstatic_value_type; i++) { 4010 nonstatic_value_type_indexes[i] = -1; 4011 } 4012 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*, 4013 max_nonstatic_value_type); 4014 4015 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 4016 if (fs.allocation_type() == STATIC_FLATTENABLE) { 4017 static_value_type_count++; 4018 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) { 4019 Symbol* signature = fs.signature(); 4020 Klass* klass = SystemDictionary::resolve_or_fail(signature, 4021 Handle(THREAD, _loader_data->class_loader()), 4022 _protection_domain, true, CHECK); 4023 assert(klass != NULL, "Sanity check"); 4024 assert(klass->access_flags().is_value_type(), "Value type expected"); 4025 ValueKlass* vk = ValueKlass::cast(klass); 4026 // Conditions to apply flattening or not should be defined in a single place 4027 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) { 4028 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index(); 4029 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass; 4030 nonstatic_value_type_count++; 4031 4032 ValueKlass* vklass = ValueKlass::cast(klass); 4033 if (vklass->contains_oops()) { 4034 value_type_oop_map_count += vklass->nonstatic_oop_map_count(); 4035 } 4036 fs.set_flattened(true); 4037 } else { 4038 not_flattened_value_types++; 4039 fs.set_flattened(false); 4040 } 4041 } 4042 } 4043 4044 // Adjusting non_static_oop_count to take into account not flattened value types; 4045 nonstatic_oop_count += not_flattened_value_types; 4046 4047 // Total non-static fields count, including every contended field 4048 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 4049 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 4050 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE]; 4051 4052 const bool super_has_nonstatic_fields = 4053 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 4054 const bool has_nonstatic_fields = 4055 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 4056 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0; 4057 4058 if (is_value_type() && (!has_nonstatic_fields)) { 4059 // There are a number of fixes required throughout the type system and JIT 4060 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet"); 4061 } 4062 4063 // Prepare list of oops for oop map generation. 4064 // 4065 // "offset" and "count" lists are describing the set of contiguous oop 4066 // regions. offset[i] is the start of the i-th region, which then has 4067 // count[i] oops following. Before we know how many regions are required, 4068 // we pessimistically allocate the maps to fit all the oops into the 4069 // distinct regions. 4070 // 4071 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count(); 4072 int max_oop_map_count = 4073 super_oop_map_count + 4074 fac->count[NONSTATIC_OOP] + 4075 value_type_oop_map_count + 4076 not_flattened_value_types; 4077 4078 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD); 4079 if (super_oop_map_count > 0) { 4080 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(), 4081 _super_klass->nonstatic_oop_map_count()); 4082 } 4083 4084 int first_nonstatic_oop_offset = 0; // will be set for first oop field 4085 4086 bool compact_fields = CompactFields; 4087 int allocation_style = FieldsAllocationStyle; 4088 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 4089 assert(false, "0 <= FieldsAllocationStyle <= 2"); 4090 allocation_style = 1; // Optimistic 4091 } 4092 4093 // The next classes have predefined hard-coded fields offsets 4094 // (see in JavaClasses::compute_hard_coded_offsets()). 4095 // Use default fields allocation order for them. 4096 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL && 4097 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 4098 _class_name == vmSymbols::java_lang_Class() || 4099 _class_name == vmSymbols::java_lang_ClassLoader() || 4100 _class_name == vmSymbols::java_lang_ref_Reference() || 4101 _class_name == vmSymbols::java_lang_ref_SoftReference() || 4102 _class_name == vmSymbols::java_lang_StackTraceElement() || 4103 _class_name == vmSymbols::java_lang_String() || 4104 _class_name == vmSymbols::java_lang_Throwable() || 4105 _class_name == vmSymbols::java_lang_Boolean() || 4106 _class_name == vmSymbols::java_lang_Character() || 4107 _class_name == vmSymbols::java_lang_Float() || 4108 _class_name == vmSymbols::java_lang_Double() || 4109 _class_name == vmSymbols::java_lang_Byte() || 4110 _class_name == vmSymbols::java_lang_Short() || 4111 _class_name == vmSymbols::java_lang_Integer() || 4112 _class_name == vmSymbols::java_lang_Long())) { 4113 allocation_style = 0; // Allocate oops first 4114 compact_fields = false; // Don't compact fields 4115 } 4116 4117 int next_nonstatic_oop_offset = 0; 4118 int next_nonstatic_double_offset = 0; 4119 4120 // Rearrange fields for a given allocation style 4121 if( allocation_style == 0 ) { 4122 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 4123 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4124 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4125 (nonstatic_oop_count * heapOopSize); 4126 } else if( allocation_style == 1 ) { 4127 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 4128 next_nonstatic_double_offset = next_nonstatic_field_offset; 4129 } else if( allocation_style == 2 ) { 4130 // Fields allocation: oops fields in super and sub classes are together. 4131 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) { 4132 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) { 4133 allocation_style = 0; // allocate oops first 4134 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4135 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4136 (nonstatic_oop_count * heapOopSize); 4137 } 4138 } 4139 if( allocation_style == 2 ) { 4140 allocation_style = 1; // allocate oops last 4141 next_nonstatic_double_offset = next_nonstatic_field_offset; 4142 } 4143 } else { 4144 ShouldNotReachHere(); 4145 } 4146 4147 int nonstatic_oop_space_count = 0; 4148 int nonstatic_word_space_count = 0; 4149 int nonstatic_short_space_count = 0; 4150 int nonstatic_byte_space_count = 0; 4151 int nonstatic_oop_space_offset = 0; 4152 int nonstatic_word_space_offset = 0; 4153 int nonstatic_short_space_offset = 0; 4154 int nonstatic_byte_space_offset = 0; 4155 4156 // Try to squeeze some of the fields into the gaps due to 4157 // long/double alignment. 4158 if (nonstatic_double_count > 0) { 4159 int offset = next_nonstatic_double_offset; 4160 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 4161 if (compact_fields && offset != next_nonstatic_double_offset) { 4162 // Allocate available fields into the gap before double field. 4163 int length = next_nonstatic_double_offset - offset; 4164 assert(length == BytesPerInt, ""); 4165 nonstatic_word_space_offset = offset; 4166 if (nonstatic_word_count > 0) { 4167 nonstatic_word_count -= 1; 4168 nonstatic_word_space_count = 1; // Only one will fit 4169 length -= BytesPerInt; 4170 offset += BytesPerInt; 4171 } 4172 nonstatic_short_space_offset = offset; 4173 while (length >= BytesPerShort && nonstatic_short_count > 0) { 4174 nonstatic_short_count -= 1; 4175 nonstatic_short_space_count += 1; 4176 length -= BytesPerShort; 4177 offset += BytesPerShort; 4178 } 4179 nonstatic_byte_space_offset = offset; 4180 while (length > 0 && nonstatic_byte_count > 0) { 4181 nonstatic_byte_count -= 1; 4182 nonstatic_byte_space_count += 1; 4183 length -= 1; 4184 } 4185 // Allocate oop field in the gap if there are no other fields for that. 4186 nonstatic_oop_space_offset = offset; 4187 if (length >= heapOopSize && nonstatic_oop_count > 0 && 4188 allocation_style != 0) { // when oop fields not first 4189 nonstatic_oop_count -= 1; 4190 nonstatic_oop_space_count = 1; // Only one will fit 4191 length -= heapOopSize; 4192 offset += heapOopSize; 4193 } 4194 } 4195 } 4196 4197 int next_nonstatic_word_offset = next_nonstatic_double_offset + 4198 (nonstatic_double_count * BytesPerLong); 4199 int next_nonstatic_short_offset = next_nonstatic_word_offset + 4200 (nonstatic_word_count * BytesPerInt); 4201 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 4202 (nonstatic_short_count * BytesPerShort); 4203 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 4204 nonstatic_byte_count; 4205 4206 // let oops jump before padding with this allocation style 4207 if( allocation_style == 1 ) { 4208 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 4209 if( nonstatic_oop_count > 0 ) { 4210 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 4211 } 4212 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 4213 } 4214 4215 // Aligning embedded value types 4216 // bug below, the current algorithm to layout embedded value types always put them at the 4217 // end of the layout, which doesn't match the different allocation policies the VM is 4218 // supposed to provide => FixMe 4219 // Note also that the current alignment policy is to make each value type starting on a 4220 // 64 bits boundary. This could be optimized later. For instance, it could be nice to 4221 // align value types according to their most constrained internal type. 4222 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4223 int next_value_type_index = 0; 4224 4225 // Iterate over fields again and compute correct offsets. 4226 // The field allocation type was temporarily stored in the offset slot. 4227 // oop fields are located before non-oop fields (static and non-static). 4228 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4229 4230 // skip already laid out fields 4231 if (fs.is_offset_set()) continue; 4232 4233 // contended instance fields are handled below 4234 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 4235 4236 int real_offset = 0; 4237 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4238 4239 // pack the rest of the fields 4240 switch (atype) { 4241 // Value types in static fields are handled with oops 4242 case STATIC_FLATTENABLE: // Fallthrough 4243 case STATIC_OOP: 4244 real_offset = next_static_oop_offset; 4245 next_static_oop_offset += heapOopSize; 4246 break; 4247 case STATIC_BYTE: 4248 real_offset = next_static_byte_offset; 4249 next_static_byte_offset += 1; 4250 break; 4251 case STATIC_SHORT: 4252 real_offset = next_static_short_offset; 4253 next_static_short_offset += BytesPerShort; 4254 break; 4255 case STATIC_WORD: 4256 real_offset = next_static_word_offset; 4257 next_static_word_offset += BytesPerInt; 4258 break; 4259 case STATIC_DOUBLE: 4260 real_offset = next_static_double_offset; 4261 next_static_double_offset += BytesPerLong; 4262 break; 4263 case NONSTATIC_FLATTENABLE: 4264 if (fs.is_flattened()) { 4265 Klass* klass = nonstatic_value_type_klasses[next_value_type_index]; 4266 assert(klass != NULL, "Klass should have been loaded and resolved earlier"); 4267 assert(klass->access_flags().is_value_type(),"Must be a value type"); 4268 ValueKlass* vklass = ValueKlass::cast(klass); 4269 real_offset = next_nonstatic_valuetype_offset; 4270 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset(); 4271 // aligning next value type on a 64 bits boundary 4272 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong); 4273 next_value_type_index += 1; 4274 4275 if (vklass->contains_oops()) { // add flatten oop maps 4276 int diff = real_offset - vklass->first_field_offset(); 4277 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps(); 4278 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count(); 4279 while (map < last_map) { 4280 nonstatic_oop_maps->add(map->offset() + diff, map->count()); 4281 map++; 4282 } 4283 } 4284 break; 4285 } else { 4286 // Fall through 4287 } 4288 case NONSTATIC_OOP: 4289 if( nonstatic_oop_space_count > 0 ) { 4290 real_offset = nonstatic_oop_space_offset; 4291 nonstatic_oop_space_offset += heapOopSize; 4292 nonstatic_oop_space_count -= 1; 4293 } else { 4294 real_offset = next_nonstatic_oop_offset; 4295 next_nonstatic_oop_offset += heapOopSize; 4296 } 4297 nonstatic_oop_maps->add(real_offset, 1); 4298 break; 4299 case NONSTATIC_BYTE: 4300 if( nonstatic_byte_space_count > 0 ) { 4301 real_offset = nonstatic_byte_space_offset; 4302 nonstatic_byte_space_offset += 1; 4303 nonstatic_byte_space_count -= 1; 4304 } else { 4305 real_offset = next_nonstatic_byte_offset; 4306 next_nonstatic_byte_offset += 1; 4307 } 4308 break; 4309 case NONSTATIC_SHORT: 4310 if( nonstatic_short_space_count > 0 ) { 4311 real_offset = nonstatic_short_space_offset; 4312 nonstatic_short_space_offset += BytesPerShort; 4313 nonstatic_short_space_count -= 1; 4314 } else { 4315 real_offset = next_nonstatic_short_offset; 4316 next_nonstatic_short_offset += BytesPerShort; 4317 } 4318 break; 4319 case NONSTATIC_WORD: 4320 if( nonstatic_word_space_count > 0 ) { 4321 real_offset = nonstatic_word_space_offset; 4322 nonstatic_word_space_offset += BytesPerInt; 4323 nonstatic_word_space_count -= 1; 4324 } else { 4325 real_offset = next_nonstatic_word_offset; 4326 next_nonstatic_word_offset += BytesPerInt; 4327 } 4328 break; 4329 case NONSTATIC_DOUBLE: 4330 real_offset = next_nonstatic_double_offset; 4331 next_nonstatic_double_offset += BytesPerLong; 4332 break; 4333 default: 4334 ShouldNotReachHere(); 4335 } 4336 fs.set_offset(real_offset); 4337 } 4338 4339 4340 // Handle the contended cases. 4341 // 4342 // Each contended field should not intersect the cache line with another contended field. 4343 // In the absence of alignment information, we end up with pessimistically separating 4344 // the fields with full-width padding. 4345 // 4346 // Additionally, this should not break alignment for the fields, so we round the alignment up 4347 // for each field. 4348 if (nonstatic_contended_count > 0) { 4349 4350 // if there is at least one contended field, we need to have pre-padding for them 4351 next_nonstatic_padded_offset += ContendedPaddingWidth; 4352 4353 // collect all contended groups 4354 ResourceBitMap bm(cp->size()); 4355 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4356 // skip already laid out fields 4357 if (fs.is_offset_set()) continue; 4358 4359 if (fs.is_contended()) { 4360 bm.set_bit(fs.contended_group()); 4361 } 4362 } 4363 4364 int current_group = -1; 4365 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4366 4367 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4368 4369 // skip already laid out fields 4370 if (fs.is_offset_set()) continue; 4371 4372 // skip non-contended fields and fields from different group 4373 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4374 4375 // handle statics below 4376 if (fs.access_flags().is_static()) continue; 4377 4378 int real_offset = 0; 4379 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4380 4381 switch (atype) { 4382 case NONSTATIC_BYTE: 4383 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4384 real_offset = next_nonstatic_padded_offset; 4385 next_nonstatic_padded_offset += 1; 4386 break; 4387 4388 case NONSTATIC_SHORT: 4389 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4390 real_offset = next_nonstatic_padded_offset; 4391 next_nonstatic_padded_offset += BytesPerShort; 4392 break; 4393 4394 case NONSTATIC_WORD: 4395 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4396 real_offset = next_nonstatic_padded_offset; 4397 next_nonstatic_padded_offset += BytesPerInt; 4398 break; 4399 4400 case NONSTATIC_DOUBLE: 4401 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4402 real_offset = next_nonstatic_padded_offset; 4403 next_nonstatic_padded_offset += BytesPerLong; 4404 break; 4405 4406 // Value types in static fields are handled with oops 4407 case NONSTATIC_FLATTENABLE: 4408 throwValueTypeLimitation(THREAD_AND_LOCATION, 4409 "@Contended annotation not supported for value types yet", fs.name(), fs.signature()); 4410 return; 4411 4412 case NONSTATIC_OOP: 4413 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4414 real_offset = next_nonstatic_padded_offset; 4415 next_nonstatic_padded_offset += heapOopSize; 4416 nonstatic_oop_maps->add(real_offset, 1); 4417 break; 4418 4419 default: 4420 ShouldNotReachHere(); 4421 } 4422 4423 if (fs.contended_group() == 0) { 4424 // Contended group defines the equivalence class over the fields: 4425 // the fields within the same contended group are not inter-padded. 4426 // The only exception is default group, which does not incur the 4427 // equivalence, and so requires intra-padding. 4428 next_nonstatic_padded_offset += ContendedPaddingWidth; 4429 } 4430 4431 fs.set_offset(real_offset); 4432 } // for 4433 4434 // Start laying out the next group. 4435 // Note that this will effectively pad the last group in the back; 4436 // this is expected to alleviate memory contention effects for 4437 // subclass fields and/or adjacent object. 4438 // If this was the default group, the padding is already in place. 4439 if (current_group != 0) { 4440 next_nonstatic_padded_offset += ContendedPaddingWidth; 4441 } 4442 } 4443 4444 // handle static fields 4445 } 4446 4447 // Entire class is contended, pad in the back. 4448 // This helps to alleviate memory contention effects for subclass fields 4449 // and/or adjacent object. 4450 if (is_contended_class) { 4451 assert(!is_value_type(), "@Contended not supported for value types yet"); 4452 next_nonstatic_padded_offset += ContendedPaddingWidth; 4453 } 4454 4455 int notaligned_nonstatic_fields_end; 4456 if (nonstatic_value_type_count != 0) { 4457 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset; 4458 } else { 4459 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4460 } 4461 4462 int nonstatic_field_sz_align = heapOopSize; 4463 if (is_value_type()) { 4464 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) { 4465 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy 4466 } 4467 } 4468 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align); 4469 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4470 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4471 4472 int static_field_size = (static_fields_end - 4473 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4474 nonstatic_field_size = nonstatic_field_size + 4475 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4476 4477 int instance_size = align_object_size(instance_end / wordSize); 4478 4479 assert(instance_size == align_object_size(align_up( 4480 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize) 4481 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value"); 4482 4483 4484 // Invariant: nonstatic_field end/start should only change if there are 4485 // nonstatic fields in the class, or if the class is contended. We compare 4486 // against the non-aligned value, so that end alignment will not fail the 4487 // assert without actually having the fields. 4488 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4489 is_contended_class || 4490 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4491 4492 // Number of non-static oop map blocks allocated at end of klass. 4493 nonstatic_oop_maps->compact(THREAD); 4494 4495 #ifndef PRODUCT 4496 if ((PrintFieldLayout && !is_value_type()) || 4497 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) { 4498 print_field_layout(_class_name, 4499 _fields, 4500 cp, 4501 instance_size, 4502 nonstatic_fields_start, 4503 nonstatic_fields_end, 4504 static_fields_end); 4505 nonstatic_oop_maps->print_on(tty); 4506 tty->print("\n"); 4507 } 4508 4509 #endif 4510 // Pass back information needed for InstanceKlass creation 4511 info->oop_map_blocks = nonstatic_oop_maps; 4512 info->instance_size = instance_size; 4513 info->static_field_size = static_field_size; 4514 info->nonstatic_field_size = nonstatic_field_size; 4515 info->has_nonstatic_fields = has_nonstatic_fields; 4516 } 4517 4518 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4519 assert(ik != NULL, "invariant"); 4520 4521 const Klass* const super = ik->super(); 4522 4523 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4524 // in which case we don't have to register objects as finalizable 4525 if (!_has_empty_finalizer) { 4526 if (_has_finalizer || 4527 (super != NULL && super->has_finalizer())) { 4528 ik->set_has_finalizer(); 4529 } 4530 } 4531 4532 #ifdef ASSERT 4533 bool f = false; 4534 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4535 vmSymbols::void_method_signature()); 4536 if (m != NULL && !m->is_empty_method()) { 4537 f = true; 4538 } 4539 4540 // Spec doesn't prevent agent from redefinition of empty finalizer. 4541 // Despite the fact that it's generally bad idea and redefined finalizer 4542 // will not work as expected we shouldn't abort vm in this case 4543 if (!ik->has_redefined_this_or_super()) { 4544 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4545 } 4546 #endif 4547 4548 // Check if this klass supports the java.lang.Cloneable interface 4549 if (SystemDictionary::Cloneable_klass_loaded()) { 4550 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4551 ik->set_is_cloneable(); 4552 } 4553 } 4554 4555 // Check if this klass has a vanilla default constructor 4556 if (super == NULL) { 4557 // java.lang.Object has empty default constructor 4558 ik->set_has_vanilla_constructor(); 4559 } else { 4560 if (super->has_vanilla_constructor() && 4561 _has_vanilla_constructor) { 4562 ik->set_has_vanilla_constructor(); 4563 } 4564 #ifdef ASSERT 4565 bool v = false; 4566 if (super->has_vanilla_constructor()) { 4567 const Method* const constructor = 4568 ik->find_method(vmSymbols::object_initializer_name(), 4569 vmSymbols::void_method_signature()); 4570 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4571 v = true; 4572 } 4573 } 4574 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4575 #endif 4576 } 4577 4578 // If it cannot be fast-path allocated, set a bit in the layout helper. 4579 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4580 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4581 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4582 || ik->is_abstract() || ik->is_interface() 4583 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4584 || ik->size_helper() >= FastAllocateSizeLimit) { 4585 // Forbid fast-path allocation. 4586 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4587 ik->set_layout_helper(lh); 4588 } 4589 } 4590 4591 bool ClassFileParser::supports_value_types() const { 4592 // Value types are only supported by class file version 53.1 and later 4593 return _major_version > JAVA_9_VERSION || (_major_version == JAVA_9_VERSION && _minor_version >= 1); 4594 } 4595 4596 // Attach super classes and interface classes to class loader data 4597 static void record_defined_class_dependencies(const InstanceKlass* defined_klass, 4598 TRAPS) { 4599 assert(defined_klass != NULL, "invariant"); 4600 4601 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data(); 4602 if (defining_loader_data->is_the_null_class_loader_data()) { 4603 // Dependencies to null class loader data are implicit. 4604 return; 4605 } else { 4606 // add super class dependency 4607 Klass* const super = defined_klass->super(); 4608 if (super != NULL) { 4609 defining_loader_data->record_dependency(super, CHECK); 4610 } 4611 4612 // add super interface dependencies 4613 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces(); 4614 if (local_interfaces != NULL) { 4615 const int length = local_interfaces->length(); 4616 for (int i = 0; i < length; i++) { 4617 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4618 } 4619 } 4620 4621 for(int i = 0; i < defined_klass->java_fields_count(); i++) { 4622 if ((defined_klass->field_access_flags(i) & JVM_ACC_FLATTENABLE) != 0) { 4623 const Klass* klass = defined_klass->get_value_field_klass(i); 4624 defining_loader_data->record_dependency(klass, CHECK); 4625 } 4626 } 4627 } 4628 } 4629 4630 // utility methods for appending an array with check for duplicates 4631 4632 static void append_interfaces(GrowableArray<Klass*>* result, 4633 const Array<Klass*>* const ifs) { 4634 // iterate over new interfaces 4635 for (int i = 0; i < ifs->length(); i++) { 4636 Klass* const e = ifs->at(i); 4637 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4638 // add new interface 4639 result->append_if_missing(e); 4640 } 4641 } 4642 4643 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super, 4644 Array<Klass*>* local_ifs, 4645 ClassLoaderData* loader_data, 4646 TRAPS) { 4647 assert(local_ifs != NULL, "invariant"); 4648 assert(loader_data != NULL, "invariant"); 4649 4650 // Compute maximum size for transitive interfaces 4651 int max_transitive_size = 0; 4652 int super_size = 0; 4653 // Add superclass transitive interfaces size 4654 if (super != NULL) { 4655 super_size = super->transitive_interfaces()->length(); 4656 max_transitive_size += super_size; 4657 } 4658 // Add local interfaces' super interfaces 4659 const int local_size = local_ifs->length(); 4660 for (int i = 0; i < local_size; i++) { 4661 Klass* const l = local_ifs->at(i); 4662 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4663 } 4664 // Finally add local interfaces 4665 max_transitive_size += local_size; 4666 // Construct array 4667 if (max_transitive_size == 0) { 4668 // no interfaces, use canonicalized array 4669 return Universe::the_empty_klass_array(); 4670 } else if (max_transitive_size == super_size) { 4671 // no new local interfaces added, share superklass' transitive interface array 4672 return super->transitive_interfaces(); 4673 } else if (max_transitive_size == local_size) { 4674 // only local interfaces added, share local interface array 4675 return local_ifs; 4676 } else { 4677 ResourceMark rm; 4678 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size); 4679 4680 // Copy down from superclass 4681 if (super != NULL) { 4682 append_interfaces(result, super->transitive_interfaces()); 4683 } 4684 4685 // Copy down from local interfaces' superinterfaces 4686 for (int i = 0; i < local_size; i++) { 4687 Klass* const l = local_ifs->at(i); 4688 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4689 } 4690 // Finally add local interfaces 4691 append_interfaces(result, local_ifs); 4692 4693 // length will be less than the max_transitive_size if duplicates were removed 4694 const int length = result->length(); 4695 assert(length <= max_transitive_size, "just checking"); 4696 Array<Klass*>* const new_result = 4697 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL); 4698 for (int i = 0; i < length; i++) { 4699 Klass* const e = result->at(i); 4700 assert(e != NULL, "just checking"); 4701 new_result->at_put(i, e); 4702 } 4703 return new_result; 4704 } 4705 } 4706 4707 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4708 assert(this_klass != NULL, "invariant"); 4709 const Klass* const super = this_klass->super(); 4710 if (super != NULL) { 4711 4712 // If the loader is not the boot loader then throw an exception if its 4713 // superclass is in package jdk.internal.reflect and its loader is not a 4714 // special reflection class loader 4715 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4716 assert(super->is_instance_klass(), "super is not instance klass"); 4717 PackageEntry* super_package = super->package(); 4718 if (super_package != NULL && 4719 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4720 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4721 ResourceMark rm(THREAD); 4722 Exceptions::fthrow( 4723 THREAD_AND_LOCATION, 4724 vmSymbols::java_lang_IllegalAccessError(), 4725 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4726 this_klass->external_name(), 4727 this_klass->class_loader_data()->loader_name(), 4728 super->external_name()); 4729 return; 4730 } 4731 } 4732 4733 Reflection::VerifyClassAccessResults vca_result = 4734 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4735 if (vca_result != Reflection::ACCESS_OK) { 4736 ResourceMark rm(THREAD); 4737 char* msg = Reflection::verify_class_access_msg(this_klass, 4738 InstanceKlass::cast(super), 4739 vca_result); 4740 if (msg == NULL) { 4741 Exceptions::fthrow( 4742 THREAD_AND_LOCATION, 4743 vmSymbols::java_lang_IllegalAccessError(), 4744 "class %s cannot access its superclass %s", 4745 this_klass->external_name(), 4746 super->external_name()); 4747 } else { 4748 // Add additional message content. 4749 Exceptions::fthrow( 4750 THREAD_AND_LOCATION, 4751 vmSymbols::java_lang_IllegalAccessError(), 4752 "superclass access check failed: %s", 4753 msg); 4754 } 4755 } 4756 } 4757 } 4758 4759 4760 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4761 assert(this_klass != NULL, "invariant"); 4762 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces(); 4763 const int lng = local_interfaces->length(); 4764 for (int i = lng - 1; i >= 0; i--) { 4765 Klass* const k = local_interfaces->at(i); 4766 assert (k != NULL && k->is_interface(), "invalid interface"); 4767 Reflection::VerifyClassAccessResults vca_result = 4768 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false); 4769 if (vca_result != Reflection::ACCESS_OK) { 4770 ResourceMark rm(THREAD); 4771 char* msg = Reflection::verify_class_access_msg(this_klass, 4772 InstanceKlass::cast(k), 4773 vca_result); 4774 if (msg == NULL) { 4775 Exceptions::fthrow( 4776 THREAD_AND_LOCATION, 4777 vmSymbols::java_lang_IllegalAccessError(), 4778 "class %s cannot access its superinterface %s", 4779 this_klass->external_name(), 4780 k->external_name()); 4781 } else { 4782 // Add additional message content. 4783 Exceptions::fthrow( 4784 THREAD_AND_LOCATION, 4785 vmSymbols::java_lang_IllegalAccessError(), 4786 "superinterface check failed: %s", 4787 msg); 4788 } 4789 } 4790 } 4791 } 4792 4793 4794 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4795 assert(this_klass != NULL, "invariant"); 4796 const Array<Method*>* const methods = this_klass->methods(); 4797 const int num_methods = methods->length(); 4798 4799 // go thru each method and check if it overrides a final method 4800 for (int index = 0; index < num_methods; index++) { 4801 const Method* const m = methods->at(index); 4802 4803 // skip private, static, and <init> methods 4804 if ((!m->is_private() && !m->is_static()) && 4805 (m->name() != vmSymbols::object_initializer_name())) { 4806 4807 const Symbol* const name = m->name(); 4808 const Symbol* const signature = m->signature(); 4809 const Klass* k = this_klass->super(); 4810 const Method* super_m = NULL; 4811 while (k != NULL) { 4812 // skip supers that don't have final methods. 4813 if (k->has_final_method()) { 4814 // lookup a matching method in the super class hierarchy 4815 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4816 if (super_m == NULL) { 4817 break; // didn't find any match; get out 4818 } 4819 4820 if (super_m->is_final() && !super_m->is_static() && 4821 // matching method in super is final, and not static 4822 (Reflection::verify_field_access(this_klass, 4823 super_m->method_holder(), 4824 super_m->method_holder(), 4825 super_m->access_flags(), false)) 4826 // this class can access super final method and therefore override 4827 ) { 4828 ResourceMark rm(THREAD); 4829 Exceptions::fthrow( 4830 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 // continue to look from super_m's holder's super. 4842 k = super_m->method_holder()->super(); 4843 continue; 4844 } 4845 4846 k = k->super(); 4847 } 4848 } 4849 } 4850 } 4851 4852 4853 // assumes that this_klass is an interface 4854 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4855 assert(this_klass != NULL, "invariant"); 4856 assert(this_klass->is_interface(), "not an interface"); 4857 const Array<Method*>* methods = this_klass->methods(); 4858 const int num_methods = methods->length(); 4859 4860 for (int index = 0; index < num_methods; index++) { 4861 const Method* const m = methods->at(index); 4862 // if m is static and not the init method, throw a verify error 4863 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4864 ResourceMark rm(THREAD); 4865 Exceptions::fthrow( 4866 THREAD_AND_LOCATION, 4867 vmSymbols::java_lang_VerifyError(), 4868 "Illegal static method %s in interface %s", 4869 m->name()->as_C_string(), 4870 this_klass->external_name() 4871 ); 4872 return; 4873 } 4874 } 4875 } 4876 4877 // utility methods for format checking 4878 4879 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4880 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4881 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0; 4882 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4883 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set"); 4884 if (is_module) { 4885 ResourceMark rm(THREAD); 4886 Exceptions::fthrow( 4887 THREAD_AND_LOCATION, 4888 vmSymbols::java_lang_NoClassDefFoundError(), 4889 "%s is not a class because access_flag ACC_MODULE is set", 4890 _class_name->as_C_string()); 4891 return; 4892 } 4893 4894 if (!_need_verify) { return; } 4895 4896 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4897 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4898 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4899 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4900 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4901 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4902 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4903 4904 if ((is_abstract && is_final) || 4905 (is_interface && !is_abstract) || 4906 (is_interface && major_gte_15 && (is_super || is_enum)) || 4907 (!is_interface && major_gte_15 && 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 static bool is_supported_version(u2 major, u2 minor) { 4930 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4931 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4932 (major <= max_version) && 4933 ((major != max_version) || 4934 (minor <= JVM_CLASSFILE_MINOR_VERSION)); 4935 } 4936 4937 void ClassFileParser::verify_legal_field_modifiers(jint flags, 4938 bool is_interface, 4939 TRAPS) const { 4940 if (!_need_verify) { return; } 4941 4942 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4943 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4944 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4945 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4946 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4947 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4948 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4949 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4950 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4951 4952 bool is_illegal = false; 4953 4954 if (is_interface) { 4955 if (!is_public || !is_static || !is_final || is_private || 4956 is_protected || is_volatile || is_transient || 4957 (major_gte_15 && is_enum)) { 4958 is_illegal = true; 4959 } 4960 } else { // not interface 4961 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4962 is_illegal = true; 4963 } 4964 } 4965 4966 if (is_illegal) { 4967 ResourceMark rm(THREAD); 4968 Exceptions::fthrow( 4969 THREAD_AND_LOCATION, 4970 vmSymbols::java_lang_ClassFormatError(), 4971 "Illegal field modifiers in class %s: 0x%X", 4972 _class_name->as_C_string(), flags); 4973 return; 4974 } 4975 } 4976 4977 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4978 bool is_interface, 4979 const Symbol* name, 4980 TRAPS) const { 4981 if (!_need_verify) { return; } 4982 4983 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4984 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4985 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4986 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4987 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4988 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4989 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4990 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4991 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4992 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4993 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4994 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4995 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4996 4997 bool is_illegal = false; 4998 4999 if (is_interface) { 5000 if (major_gte_8) { 5001 // Class file version is JAVA_8_VERSION or later Methods of 5002 // interfaces may set any of the flags except ACC_PROTECTED, 5003 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 5004 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 5005 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 5006 (is_native || is_protected || is_final || is_synchronized) || 5007 // If a specific method of a class or interface has its 5008 // ACC_ABSTRACT flag set, it must not have any of its 5009 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 5010 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 5011 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 5012 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 5013 (is_abstract && (is_private || is_static || is_strict))) { 5014 is_illegal = true; 5015 } 5016 } else if (major_gte_15) { 5017 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 5018 if (!is_public || is_private || is_protected || is_static || is_final || 5019 is_synchronized || is_native || !is_abstract || is_strict) { 5020 is_illegal = true; 5021 } 5022 } else { 5023 // Class file version is pre-JAVA_1_5_VERSION 5024 if (!is_public || is_static || is_final || is_native || !is_abstract) { 5025 is_illegal = true; 5026 } 5027 } 5028 } else { // not interface 5029 if (has_illegal_visibility(flags)) { 5030 is_illegal = true; 5031 } else { 5032 if (is_initializer) { 5033 if (is_static || is_final || is_synchronized || is_native || 5034 is_abstract || (major_gte_15 && is_bridge)) { 5035 is_illegal = true; 5036 } 5037 } else { // not initializer 5038 if (is_abstract) { 5039 if ((is_final || is_native || is_private || is_static || 5040 (major_gte_15 && (is_synchronized || is_strict)))) { 5041 is_illegal = true; 5042 } 5043 } 5044 } 5045 } 5046 } 5047 5048 if (is_illegal) { 5049 ResourceMark rm(THREAD); 5050 Exceptions::fthrow( 5051 THREAD_AND_LOCATION, 5052 vmSymbols::java_lang_ClassFormatError(), 5053 "Method %s in class %s has illegal modifiers: 0x%X", 5054 name->as_C_string(), _class_name->as_C_string(), flags); 5055 return; 5056 } 5057 } 5058 5059 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 5060 int length, 5061 TRAPS) const { 5062 assert(_need_verify, "only called when _need_verify is true"); 5063 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 5064 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5065 } 5066 } 5067 5068 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5069 // In class names, '/' separates unqualified names. This is verified in this function also. 5070 // Method names also may not contain the characters '<' or '>', unless <init> 5071 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5072 // method. Because these names have been checked as special cases before 5073 // calling this method in verify_legal_method_name. 5074 // 5075 // This method is also called from the modular system APIs in modules.cpp 5076 // to verify the validity of module and package names. 5077 bool ClassFileParser::verify_unqualified_name(const char* name, 5078 unsigned int length, 5079 int type) { 5080 for (const char* p = name; p != name + length;) { 5081 jchar ch = *p; 5082 if (ch < 128) { 5083 if (ch == '.' || ch == ';' || ch == '[' ) { 5084 return false; // do not permit '.', ';', or '[' 5085 } 5086 if (ch == '/') { 5087 // check for '//' or leading or trailing '/' which are not legal 5088 // unqualified name must not be empty 5089 if (type == ClassFileParser::LegalClass) { 5090 if (p == name || p+1 >= name+length || *(p+1) == '/') { 5091 return false; 5092 } 5093 } else { 5094 return false; // do not permit '/' unless it's class name 5095 } 5096 } 5097 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) { 5098 return false; // do not permit '<' or '>' in method names 5099 } 5100 p++; 5101 } else { 5102 char* tmp_p = UTF8::next(p, &ch); 5103 p = tmp_p; 5104 } 5105 } 5106 return true; 5107 } 5108 5109 // Take pointer to a string. Skip over the longest part of the string that could 5110 // be taken as a fieldname. Allow '/' if slash_ok is true. 5111 // Return a pointer to just past the fieldname. 5112 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5113 // being true, we saw consecutive slashes (meaning we were looking for a 5114 // qualified path but found something that was badly-formed). 5115 static const char* skip_over_field_name(const char* name, 5116 bool slash_ok, 5117 unsigned int length) { 5118 const char* p; 5119 jboolean last_is_slash = false; 5120 jboolean not_first_ch = false; 5121 5122 for (p = name; p != name + length; not_first_ch = true) { 5123 const char* old_p = p; 5124 jchar ch = *p; 5125 if (ch < 128) { 5126 p++; 5127 // quick check for ascii 5128 if ((ch >= 'a' && ch <= 'z') || 5129 (ch >= 'A' && ch <= 'Z') || 5130 (ch == '_' || ch == '$') || 5131 (not_first_ch && ch >= '0' && ch <= '9')) { 5132 last_is_slash = false; 5133 continue; 5134 } 5135 if (slash_ok && ch == '/') { 5136 if (last_is_slash) { 5137 return NULL; // Don't permit consecutive slashes 5138 } 5139 last_is_slash = true; 5140 continue; 5141 } 5142 } 5143 else { 5144 jint unicode_ch; 5145 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5146 p = tmp_p; 5147 last_is_slash = false; 5148 // Check if ch is Java identifier start or is Java identifier part 5149 // 4672820: call java.lang.Character methods directly without generating separate tables. 5150 EXCEPTION_MARK; 5151 5152 // return value 5153 JavaValue result(T_BOOLEAN); 5154 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5155 JavaCallArguments args; 5156 args.push_int(unicode_ch); 5157 5158 // public static boolean isJavaIdentifierStart(char ch); 5159 JavaCalls::call_static(&result, 5160 SystemDictionary::Character_klass(), 5161 vmSymbols::isJavaIdentifierStart_name(), 5162 vmSymbols::int_bool_signature(), 5163 &args, 5164 THREAD); 5165 5166 if (HAS_PENDING_EXCEPTION) { 5167 CLEAR_PENDING_EXCEPTION; 5168 return 0; 5169 } 5170 if (result.get_jboolean()) { 5171 continue; 5172 } 5173 5174 if (not_first_ch) { 5175 // public static boolean isJavaIdentifierPart(char ch); 5176 JavaCalls::call_static(&result, 5177 SystemDictionary::Character_klass(), 5178 vmSymbols::isJavaIdentifierPart_name(), 5179 vmSymbols::int_bool_signature(), 5180 &args, 5181 THREAD); 5182 5183 if (HAS_PENDING_EXCEPTION) { 5184 CLEAR_PENDING_EXCEPTION; 5185 return 0; 5186 } 5187 5188 if (result.get_jboolean()) { 5189 continue; 5190 } 5191 } 5192 } 5193 return (not_first_ch) ? old_p : NULL; 5194 } 5195 return (not_first_ch) ? p : NULL; 5196 } 5197 5198 // Take pointer to a string. Skip over the longest part of the string that could 5199 // be taken as a field signature. Allow "void" if void_ok. 5200 // Return a pointer to just past the signature. 5201 // Return NULL if no legal signature is found. 5202 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5203 bool void_ok, 5204 unsigned int length, 5205 TRAPS) const { 5206 unsigned int array_dim = 0; 5207 while (length > 0) { 5208 switch (signature[0]) { 5209 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5210 case JVM_SIGNATURE_BOOLEAN: 5211 case JVM_SIGNATURE_BYTE: 5212 case JVM_SIGNATURE_CHAR: 5213 case JVM_SIGNATURE_SHORT: 5214 case JVM_SIGNATURE_INT: 5215 case JVM_SIGNATURE_FLOAT: 5216 case JVM_SIGNATURE_LONG: 5217 case JVM_SIGNATURE_DOUBLE: 5218 return signature + 1; 5219 case JVM_SIGNATURE_CLASS: 5220 { 5221 if (_major_version < JAVA_1_5_VERSION) { 5222 // Skip over the class name if one is there 5223 const char* const p = skip_over_field_name(signature + 1, true, --length); 5224 5225 // The next character better be a semicolon 5226 if (p && (p - signature) > 1 && p[0] == ';') { 5227 return p + 1; 5228 } 5229 } 5230 else { 5231 // Skip leading 'L' and ignore first appearance of ';' 5232 length--; 5233 signature++; 5234 char* c = strchr((char*) signature, ';'); 5235 // Format check signature 5236 if (c != NULL) { 5237 ResourceMark rm(THREAD); 5238 int newlen = c - (char*) signature; 5239 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1); 5240 strncpy(sig, signature, newlen); 5241 sig[newlen] = '\0'; 5242 5243 bool legal = verify_unqualified_name(sig, newlen, LegalClass); 5244 if (!legal) { 5245 classfile_parse_error("Class name contains illegal character " 5246 "in descriptor in class file %s", 5247 CHECK_0); 5248 return NULL; 5249 } 5250 return signature + newlen + 1; 5251 } 5252 } 5253 return NULL; 5254 } 5255 case JVM_SIGNATURE_ARRAY: 5256 array_dim++; 5257 if (array_dim > 255) { 5258 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5259 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5260 } 5261 // The rest of what's there better be a legal signature 5262 signature++; 5263 length--; 5264 void_ok = false; 5265 break; 5266 default: 5267 return NULL; 5268 } 5269 } 5270 return NULL; 5271 } 5272 5273 // Checks if name is a legal class name. 5274 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5275 if (!_need_verify || _relax_verify) { return; } 5276 5277 char buf[fixed_buffer_size]; 5278 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5279 unsigned int length = name->utf8_length(); 5280 bool legal = false; 5281 5282 if (length > 0) { 5283 const char* p; 5284 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5285 p = skip_over_field_signature(bytes, false, length, CHECK); 5286 legal = (p != NULL) && ((p - bytes) == (int)length); 5287 } else if (_major_version < JAVA_1_5_VERSION) { 5288 if (bytes[0] != '<') { 5289 p = skip_over_field_name(bytes, true, length); 5290 legal = (p != NULL) && ((p - bytes) == (int)length); 5291 } 5292 } else { 5293 // 4900761: relax the constraints based on JSR202 spec 5294 // Class names may be drawn from the entire Unicode character set. 5295 // Identifiers between '/' must be unqualified names. 5296 // The utf8 string has been verified when parsing cpool entries. 5297 legal = verify_unqualified_name(bytes, length, LegalClass); 5298 } 5299 } 5300 if (!legal) { 5301 ResourceMark rm(THREAD); 5302 assert(_class_name != NULL, "invariant"); 5303 Exceptions::fthrow( 5304 THREAD_AND_LOCATION, 5305 vmSymbols::java_lang_ClassFormatError(), 5306 "Illegal class name \"%s\" in class file %s", bytes, 5307 _class_name->as_C_string() 5308 ); 5309 return; 5310 } 5311 } 5312 5313 // Checks if name is a legal field name. 5314 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5315 if (!_need_verify || _relax_verify) { return; } 5316 5317 char buf[fixed_buffer_size]; 5318 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5319 unsigned int length = name->utf8_length(); 5320 bool legal = false; 5321 5322 if (length > 0) { 5323 if (_major_version < JAVA_1_5_VERSION) { 5324 if (bytes[0] != '<') { 5325 const char* p = skip_over_field_name(bytes, false, length); 5326 legal = (p != NULL) && ((p - bytes) == (int)length); 5327 } 5328 } else { 5329 // 4881221: relax the constraints based on JSR202 spec 5330 legal = verify_unqualified_name(bytes, length, LegalField); 5331 } 5332 } 5333 5334 if (!legal) { 5335 ResourceMark rm(THREAD); 5336 assert(_class_name != NULL, "invariant"); 5337 Exceptions::fthrow( 5338 THREAD_AND_LOCATION, 5339 vmSymbols::java_lang_ClassFormatError(), 5340 "Illegal field name \"%s\" in class %s", bytes, 5341 _class_name->as_C_string() 5342 ); 5343 return; 5344 } 5345 } 5346 5347 // Checks if name is a legal method name. 5348 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5349 if (!_need_verify || _relax_verify) { return; } 5350 5351 assert(name != NULL, "method name is null"); 5352 char buf[fixed_buffer_size]; 5353 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5354 unsigned int length = name->utf8_length(); 5355 bool legal = false; 5356 5357 if (length > 0) { 5358 if (bytes[0] == '<') { 5359 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5360 legal = true; 5361 } 5362 } else if (_major_version < JAVA_1_5_VERSION) { 5363 const char* p; 5364 p = skip_over_field_name(bytes, false, length); 5365 legal = (p != NULL) && ((p - bytes) == (int)length); 5366 } else { 5367 // 4881221: relax the constraints based on JSR202 spec 5368 legal = verify_unqualified_name(bytes, length, LegalMethod); 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 method name \"%s\" in class %s", bytes, 5379 _class_name->as_C_string() 5380 ); 5381 return; 5382 } 5383 } 5384 5385 5386 // Checks if signature is a legal field signature. 5387 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5388 const Symbol* signature, 5389 TRAPS) const { 5390 if (!_need_verify) { return; } 5391 5392 char buf[fixed_buffer_size]; 5393 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5394 const unsigned int length = signature->utf8_length(); 5395 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5396 5397 if (p == NULL || (p - bytes) != (int)length) { 5398 throwIllegalSignature("Field", name, signature, CHECK); 5399 } 5400 } 5401 5402 // Checks if signature is a legal method signature. 5403 // Returns number of parameters 5404 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5405 const Symbol* signature, 5406 TRAPS) const { 5407 if (!_need_verify) { 5408 // make sure caller's args_size will be less than 0 even for non-static 5409 // method so it will be recomputed in compute_size_of_parameters(). 5410 return -2; 5411 } 5412 5413 // Class initializers cannot have args for class format version >= 51. 5414 if (name == vmSymbols::class_initializer_name() && 5415 signature != vmSymbols::void_method_signature() && 5416 _major_version >= JAVA_7_VERSION) { 5417 throwIllegalSignature("Method", name, signature, CHECK_0); 5418 return 0; 5419 } 5420 5421 unsigned int args_size = 0; 5422 char buf[fixed_buffer_size]; 5423 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5424 unsigned int length = signature->utf8_length(); 5425 const char* nextp; 5426 5427 // The first character must be a '(' 5428 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5429 length--; 5430 // Skip over legal field signatures 5431 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5432 while ((length > 0) && (nextp != NULL)) { 5433 args_size++; 5434 if (p[0] == 'J' || p[0] == 'D') { 5435 args_size++; 5436 } 5437 length -= nextp - p; 5438 p = nextp; 5439 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5440 } 5441 // The first non-signature thing better be a ')' 5442 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5443 length--; 5444 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5445 // All internal methods must return void 5446 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5447 return args_size; 5448 } 5449 } else { 5450 // Now we better just have a return value 5451 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5452 if (nextp && ((int)length == (nextp - p))) { 5453 return args_size; 5454 } 5455 } 5456 } 5457 } 5458 // Report error 5459 throwIllegalSignature("Method", name, signature, CHECK_0); 5460 return 0; 5461 } 5462 5463 int ClassFileParser::static_field_size() const { 5464 assert(_field_info != NULL, "invariant"); 5465 return _field_info->static_field_size; 5466 } 5467 5468 int ClassFileParser::total_oop_map_count() const { 5469 assert(_field_info != NULL, "invariant"); 5470 return _field_info->oop_map_blocks->nonstatic_oop_map_count; 5471 } 5472 5473 jint ClassFileParser::layout_size() const { 5474 assert(_field_info != NULL, "invariant"); 5475 return _field_info->instance_size; 5476 } 5477 5478 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5479 const Array<Method*>* methods) { 5480 assert(ik != NULL, "invariant"); 5481 assert(methods != NULL, "invariant"); 5482 5483 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5484 // (We used to do this lazily, but now we query it in Rewriter, 5485 // which is eagerly done for every method, so we might as well do it now, 5486 // when everything is fresh in memory.) 5487 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5488 5489 if (klass_id != vmSymbols::NO_SID) { 5490 for (int j = 0; j < methods->length(); ++j) { 5491 Method* method = methods->at(j); 5492 method->init_intrinsic_id(); 5493 5494 if (CheckIntrinsics) { 5495 // Check if an intrinsic is defined for method 'method', 5496 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5497 if (method->intrinsic_id() != vmIntrinsics::_none && 5498 !method->intrinsic_candidate()) { 5499 tty->print("Compiler intrinsic is defined for method [%s], " 5500 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5501 method->name_and_sig_as_C_string(), 5502 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5503 ); 5504 tty->cr(); 5505 DEBUG_ONLY(vm_exit(1)); 5506 } 5507 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5508 // but there is no intrinsic available for it. 5509 if (method->intrinsic_candidate() && 5510 method->intrinsic_id() == vmIntrinsics::_none) { 5511 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5512 "but no compiler intrinsic is defined for the method.%s", 5513 method->name_and_sig_as_C_string(), 5514 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5515 ); 5516 tty->cr(); 5517 DEBUG_ONLY(vm_exit(1)); 5518 } 5519 } 5520 } // end for 5521 5522 #ifdef ASSERT 5523 if (CheckIntrinsics) { 5524 // Check for orphan methods in the current class. A method m 5525 // of a class C is orphan if an intrinsic is defined for method m, 5526 // but class C does not declare m. 5527 // The check is potentially expensive, therefore it is available 5528 // only in debug builds. 5529 5530 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5531 if (vmIntrinsics::_compiledLambdaForm == id) { 5532 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5533 // generated for the JVM from a LambdaForm and therefore no method 5534 // is defined for it. 5535 continue; 5536 } 5537 5538 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5539 // Check if the current class contains a method with the same 5540 // name, flags, signature. 5541 bool match = false; 5542 for (int j = 0; j < methods->length(); ++j) { 5543 const Method* method = methods->at(j); 5544 if (method->intrinsic_id() == id) { 5545 match = true; 5546 break; 5547 } 5548 } 5549 5550 if (!match) { 5551 char buf[1000]; 5552 tty->print("Compiler intrinsic is defined for method [%s], " 5553 "but the method is not available in class [%s].%s", 5554 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5555 buf, sizeof(buf)), 5556 ik->name()->as_C_string(), 5557 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5558 ); 5559 tty->cr(); 5560 DEBUG_ONLY(vm_exit(1)); 5561 } 5562 } 5563 } // end for 5564 } // CheckIntrinsics 5565 #endif // ASSERT 5566 } 5567 } 5568 5569 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5570 if (_klass != NULL) { 5571 return _klass; 5572 } 5573 5574 InstanceKlass* const ik = 5575 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5576 5577 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5578 5579 assert(_klass == ik, "invariant"); 5580 5581 ik->set_has_passed_fingerprint_check(false); 5582 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5583 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5584 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) { 5585 // This class matches with a class saved in an AOT library 5586 ik->set_has_passed_fingerprint_check(true); 5587 } else { 5588 ResourceMark rm; 5589 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5590 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5591 } 5592 } 5593 5594 if (ik->is_value()) { 5595 ValueKlass* vk = ValueKlass::cast(ik); 5596 oop val = ik->allocate_instance(CHECK_NULL); 5597 vk->set_default_value(val); 5598 } 5599 5600 return ik; 5601 } 5602 5603 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5604 assert(ik != NULL, "invariant"); 5605 5606 set_klass_to_deallocate(ik); 5607 5608 assert(_field_info != NULL, "invariant"); 5609 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5610 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count, 5611 "sanity"); 5612 5613 assert(ik->is_instance_klass(), "sanity"); 5614 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5615 5616 // Fill in information already parsed 5617 ik->set_should_verify_class(_need_verify); 5618 5619 // Not yet: supers are done below to support the new subtype-checking fields 5620 ik->set_class_loader_data(_loader_data); 5621 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5622 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5623 assert(_fac != NULL, "invariant"); 5624 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]); 5625 5626 // this transfers ownership of a lot of arrays from 5627 // the parser onto the InstanceKlass* 5628 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5629 5630 // note that is not safe to use the fields in the parser from this point on 5631 assert(NULL == _cp, "invariant"); 5632 assert(NULL == _fields, "invariant"); 5633 assert(NULL == _methods, "invariant"); 5634 assert(NULL == _inner_classes, "invariant"); 5635 assert(NULL == _local_interfaces, "invariant"); 5636 assert(NULL == _transitive_interfaces, "invariant"); 5637 assert(NULL == _combined_annotations, "invariant"); 5638 5639 if (_has_final_method) { 5640 ik->set_has_final_method(); 5641 } 5642 5643 ik->copy_method_ordering(_method_ordering, CHECK); 5644 // The InstanceKlass::_methods_jmethod_ids cache 5645 // is managed on the assumption that the initial cache 5646 // size is equal to the number of methods in the class. If 5647 // that changes, then InstanceKlass::idnum_can_increment() 5648 // has to be changed accordingly. 5649 ik->set_initial_method_idnum(ik->methods()->length()); 5650 5651 ik->set_name(_class_name); 5652 5653 if (is_anonymous()) { 5654 // _this_class_index is a CONSTANT_Class entry that refers to this 5655 // anonymous class itself. If this class needs to refer to its own methods or 5656 // fields, it would use a CONSTANT_MethodRef, etc, which would reference 5657 // _this_class_index. However, because this class is anonymous (it's 5658 // not stored in SystemDictionary), _this_class_index cannot be resolved 5659 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5660 // Therefore, we must eagerly resolve _this_class_index now. 5661 ik->constants()->klass_at_put(_this_class_index, ik); 5662 } 5663 5664 ik->set_minor_version(_minor_version); 5665 ik->set_major_version(_major_version); 5666 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5667 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5668 5669 if (_host_klass != NULL) { 5670 assert (ik->is_anonymous(), "should be the same"); 5671 ik->set_host_klass(_host_klass); 5672 } 5673 5674 // Set PackageEntry for this_klass 5675 oop cl = ik->class_loader(); 5676 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5677 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5678 ik->set_package(cld, CHECK); 5679 5680 const Array<Method*>* const methods = ik->methods(); 5681 assert(methods != NULL, "invariant"); 5682 const int methods_len = methods->length(); 5683 5684 check_methods_for_intrinsics(ik, methods); 5685 5686 // Fill in field values obtained by parse_classfile_attributes 5687 if (_parsed_annotations->has_any_annotations()) { 5688 _parsed_annotations->apply_to(ik); 5689 } 5690 5691 apply_parsed_class_attributes(ik); 5692 5693 // Miranda methods 5694 if ((_num_miranda_methods > 0) || 5695 // if this class introduced new miranda methods or 5696 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5697 // super class exists and this class inherited miranda methods 5698 ) { 5699 ik->set_has_miranda_methods(); // then set a flag 5700 } 5701 5702 // Fill in information needed to compute superclasses. 5703 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), CHECK); 5704 5705 // Initialize itable offset tables 5706 klassItable::setup_itable_offset_table(ik); 5707 5708 // Compute transitive closure of interfaces this class implements 5709 // Do final class setup 5710 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks; 5711 if (oop_map_blocks->nonstatic_oop_map_count > 0) { 5712 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); 5713 } 5714 5715 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5716 set_precomputed_flags(ik); 5717 5718 // check if this class can access its super class 5719 check_super_class_access(ik, CHECK); 5720 5721 // check if this class can access its superinterfaces 5722 check_super_interface_access(ik, CHECK); 5723 5724 // check if this class overrides any final method 5725 check_final_method_override(ik, CHECK); 5726 5727 // reject static interface methods prior to Java 8 5728 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5729 check_illegal_static_method(ik, CHECK); 5730 } 5731 5732 // Obtain this_klass' module entry 5733 ModuleEntry* module_entry = ik->module(); 5734 assert(module_entry != NULL, "module_entry should always be set"); 5735 5736 // Obtain java.lang.Module 5737 Handle module_handle(THREAD, module_entry->module()); 5738 5739 // Allocate mirror and initialize static fields 5740 // The create_mirror() call will also call compute_modifiers() 5741 java_lang_Class::create_mirror(ik, 5742 Handle(THREAD, _loader_data->class_loader()), 5743 module_handle, 5744 _protection_domain, 5745 CHECK); 5746 5747 assert(_all_mirandas != NULL, "invariant"); 5748 5749 // Generate any default methods - default methods are public interface methods 5750 // that have a default implementation. This is new with Java 8. 5751 if (_has_nonstatic_concrete_methods) { 5752 DefaultMethods::generate_default_methods(ik, 5753 _all_mirandas, 5754 CHECK); 5755 } 5756 5757 if (is_value_type()) { 5758 ValueKlass* vk = ValueKlass::cast(ik); 5759 vk->set_if_bufferable(); 5760 vk->initialize_calling_convention(); 5761 } 5762 5763 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5764 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5765 !module_entry->has_default_read_edges()) { 5766 if (!module_entry->set_has_default_read_edges()) { 5767 // We won a potential race 5768 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5769 } 5770 } 5771 5772 int nfields = ik->java_fields_count(); 5773 if (ik->is_value()) nfields++; 5774 for(int i = 0; i < nfields; i++) { 5775 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) { 5776 Klass* klass = SystemDictionary::resolve_or_fail(ik->field_signature(i), 5777 Handle(THREAD, ik->class_loader()), 5778 Handle(THREAD, ik->protection_domain()), true, CHECK); 5779 assert(klass != NULL, "Sanity check"); 5780 assert(klass->access_flags().is_value_type(), "Value type expected"); 5781 ik->set_value_field_klass(i, klass); 5782 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0) 5783 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) { 5784 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i)); 5785 } 5786 } 5787 5788 // Update the loader_data graph. 5789 record_defined_class_dependencies(ik, CHECK); 5790 5791 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5792 5793 if (!is_internal()) { 5794 if (log_is_enabled(Info, class, load)) { 5795 ResourceMark rm; 5796 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5797 ik->print_class_load_logging(_loader_data, module_name, _stream); 5798 } 5799 5800 if (log_is_enabled(Debug, class, resolve)) { 5801 ResourceMark rm; 5802 // print out the superclass. 5803 const char * from = ik->external_name(); 5804 if (ik->java_super() != NULL) { 5805 log_debug(class, resolve)("%s %s (super)", 5806 from, 5807 ik->java_super()->external_name()); 5808 } 5809 // print out each of the interface classes referred to by this class. 5810 const Array<Klass*>* const local_interfaces = ik->local_interfaces(); 5811 if (local_interfaces != NULL) { 5812 const int length = local_interfaces->length(); 5813 for (int i = 0; i < length; i++) { 5814 const Klass* const k = local_interfaces->at(i); 5815 const char * to = k->external_name(); 5816 log_debug(class, resolve)("%s %s (interface)", from, to); 5817 } 5818 } 5819 } 5820 } 5821 5822 TRACE_INIT_ID(ik); 5823 5824 // If we reach here, all is well. 5825 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5826 // in order for it to not be destroyed in the ClassFileParser destructor. 5827 set_klass_to_deallocate(NULL); 5828 5829 // it's official 5830 set_klass(ik); 5831 5832 debug_only(ik->verify();) 5833 } 5834 5835 // For an anonymous class that is in the unnamed package, move it to its host class's 5836 // package by prepending its host class's package name to its class name and setting 5837 // its _class_name field. 5838 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) { 5839 ResourceMark rm(THREAD); 5840 assert(strrchr(_class_name->as_C_string(), '/') == NULL, 5841 "Anonymous class should not be in a package"); 5842 const char* host_pkg_name = 5843 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL); 5844 5845 if (host_pkg_name != NULL) { 5846 size_t host_pkg_len = strlen(host_pkg_name); 5847 int class_name_len = _class_name->utf8_length(); 5848 char* new_anon_name = 5849 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len); 5850 // Copy host package name and trailing /. 5851 strncpy(new_anon_name, host_pkg_name, host_pkg_len); 5852 new_anon_name[host_pkg_len] = '/'; 5853 // Append anonymous class name. The anonymous class name can contain odd 5854 // characters. So, do a strncpy instead of using sprintf("%s..."). 5855 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len); 5856 5857 // Create a symbol and update the anonymous class name. 5858 _class_name = SymbolTable::new_symbol(new_anon_name, 5859 (int)host_pkg_len + 1 + class_name_len, 5860 CHECK); 5861 } 5862 } 5863 5864 // If the host class and the anonymous class are in the same package then do 5865 // nothing. If the anonymous class is in the unnamed package then move it to its 5866 // host's package. If the classes are in different packages then throw an IAE 5867 // exception. 5868 void ClassFileParser::fix_anonymous_class_name(TRAPS) { 5869 assert(_host_klass != NULL, "Expected an anonymous class"); 5870 5871 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(), 5872 _class_name->utf8_length(), '/'); 5873 if (anon_last_slash == NULL) { // Unnamed package 5874 prepend_host_package_name(_host_klass, CHECK); 5875 } else { 5876 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) { 5877 ResourceMark rm(THREAD); 5878 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5879 err_msg("Host class %s and anonymous class %s are in different packages", 5880 _host_klass->name()->as_C_string(), _class_name->as_C_string())); 5881 } 5882 } 5883 } 5884 5885 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5886 bool trusted = (loader_data->is_the_null_class_loader_data() || 5887 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 5888 bool need_verify = 5889 // verifyAll 5890 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5891 // verifyRemote 5892 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5893 return !need_verify; 5894 } 5895 5896 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5897 Symbol* name, 5898 ClassLoaderData* loader_data, 5899 Handle protection_domain, 5900 const InstanceKlass* host_klass, 5901 GrowableArray<Handle>* cp_patches, 5902 Publicity pub_level, 5903 TRAPS) : 5904 _stream(stream), 5905 _requested_name(name), 5906 _loader_data(loader_data), 5907 _host_klass(host_klass), 5908 _cp_patches(cp_patches), 5909 _num_patched_klasses(0), 5910 _max_num_patched_klasses(0), 5911 _orig_cp_size(0), 5912 _first_patched_klass_resolved_index(0), 5913 _super_klass(), 5914 _cp(NULL), 5915 _fields(NULL), 5916 _methods(NULL), 5917 _inner_classes(NULL), 5918 _local_interfaces(NULL), 5919 _transitive_interfaces(NULL), 5920 _combined_annotations(NULL), 5921 _annotations(NULL), 5922 _type_annotations(NULL), 5923 _fields_annotations(NULL), 5924 _fields_type_annotations(NULL), 5925 _klass(NULL), 5926 _klass_to_deallocate(NULL), 5927 _parsed_annotations(NULL), 5928 _fac(NULL), 5929 _field_info(NULL), 5930 _method_ordering(NULL), 5931 _all_mirandas(NULL), 5932 _vtable_size(0), 5933 _itable_size(0), 5934 _num_miranda_methods(0), 5935 _rt(REF_NONE), 5936 _protection_domain(protection_domain), 5937 _access_flags(), 5938 _pub_level(pub_level), 5939 _bad_constant_seen(0), 5940 _synthetic_flag(false), 5941 _sde_length(false), 5942 _sde_buffer(NULL), 5943 _sourcefile_index(0), 5944 _generic_signature_index(0), 5945 _major_version(0), 5946 _minor_version(0), 5947 _this_class_index(0), 5948 _super_class_index(0), 5949 _itfs_len(0), 5950 _java_fields_count(0), 5951 _need_verify(false), 5952 _relax_verify(false), 5953 _has_nonstatic_concrete_methods(false), 5954 _declares_nonstatic_concrete_methods(false), 5955 _has_final_method(false), 5956 _has_finalizer(false), 5957 _has_empty_finalizer(false), 5958 _has_vanilla_constructor(false), 5959 _max_bootstrap_specifier_index(-1), 5960 _has_flattenable_fields(false) { 5961 5962 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 5963 5964 assert(THREAD->is_Java_thread(), "invariant"); 5965 assert(_loader_data != NULL, "invariant"); 5966 assert(stream != NULL, "invariant"); 5967 assert(_stream != NULL, "invariant"); 5968 assert(_stream->buffer() == _stream->current(), "invariant"); 5969 assert(_class_name != NULL, "invariant"); 5970 assert(0 == _access_flags.as_int(), "invariant"); 5971 5972 // Figure out whether we can skip format checking (matching classic VM behavior) 5973 if (DumpSharedSpaces) { 5974 // verify == true means it's a 'remote' class (i.e., non-boot class) 5975 // Verification decision is based on BytecodeVerificationRemote flag 5976 // for those classes. 5977 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 5978 BytecodeVerificationLocal; 5979 } 5980 else { 5981 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 5982 stream->need_verify()); 5983 } 5984 if (_cp_patches != NULL) { 5985 int len = _cp_patches->length(); 5986 for (int i=0; i<len; i++) { 5987 if (has_cp_patch_at(i)) { 5988 Handle patch = cp_patch_at(i); 5989 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 5990 // We need to append the names of the patched classes to the end of the constant pool, 5991 // because a patched class may have a Utf8 name that's not already included in the 5992 // original constant pool. These class names are used when patch_constant_pool() 5993 // calls patch_class(). 5994 // 5995 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 5996 // At this point, we don't know the tag for index i yet, because we haven't parsed the 5997 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 5998 _max_num_patched_klasses++; 5999 } 6000 } 6001 } 6002 } 6003 6004 // synch back verification state to stream 6005 stream->set_verify(_need_verify); 6006 6007 // Check if verification needs to be relaxed for this class file 6008 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 6009 _relax_verify = relax_format_check_for(_loader_data); 6010 6011 parse_stream(stream, CHECK); 6012 6013 post_process_parsed_stream(stream, _cp, CHECK); 6014 } 6015 6016 void ClassFileParser::clear_class_metadata() { 6017 // metadata created before the instance klass is created. Must be 6018 // deallocated if classfile parsing returns an error. 6019 _cp = NULL; 6020 _fields = NULL; 6021 _methods = NULL; 6022 _inner_classes = NULL; 6023 _local_interfaces = NULL; 6024 _transitive_interfaces = NULL; 6025 _combined_annotations = NULL; 6026 _annotations = _type_annotations = NULL; 6027 _fields_annotations = _fields_type_annotations = NULL; 6028 } 6029 6030 // Destructor to clean up 6031 ClassFileParser::~ClassFileParser() { 6032 if (_cp != NULL) { 6033 MetadataFactory::free_metadata(_loader_data, _cp); 6034 } 6035 if (_fields != NULL) { 6036 MetadataFactory::free_array<u2>(_loader_data, _fields); 6037 } 6038 6039 if (_methods != NULL) { 6040 // Free methods 6041 InstanceKlass::deallocate_methods(_loader_data, _methods); 6042 } 6043 6044 // beware of the Universe::empty_blah_array!! 6045 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 6046 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 6047 } 6048 6049 // Free interfaces 6050 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 6051 _local_interfaces, _transitive_interfaces); 6052 6053 if (_combined_annotations != NULL) { 6054 // After all annotations arrays have been created, they are installed into the 6055 // Annotations object that will be assigned to the InstanceKlass being created. 6056 6057 // Deallocate the Annotations object and the installed annotations arrays. 6058 _combined_annotations->deallocate_contents(_loader_data); 6059 6060 // If the _combined_annotations pointer is non-NULL, 6061 // then the other annotations fields should have been cleared. 6062 assert(_annotations == NULL, "Should have been cleared"); 6063 assert(_type_annotations == NULL, "Should have been cleared"); 6064 assert(_fields_annotations == NULL, "Should have been cleared"); 6065 assert(_fields_type_annotations == NULL, "Should have been cleared"); 6066 } else { 6067 // If the annotations arrays were not installed into the Annotations object, 6068 // then they have to be deallocated explicitly. 6069 MetadataFactory::free_array<u1>(_loader_data, _annotations); 6070 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 6071 Annotations::free_contents(_loader_data, _fields_annotations); 6072 Annotations::free_contents(_loader_data, _fields_type_annotations); 6073 } 6074 6075 clear_class_metadata(); 6076 6077 // deallocate the klass if already created. Don't directly deallocate, but add 6078 // to the deallocate list so that the klass is removed from the CLD::_klasses list 6079 // at a safepoint. 6080 if (_klass_to_deallocate != NULL) { 6081 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 6082 } 6083 } 6084 6085 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 6086 TRAPS) { 6087 6088 assert(stream != NULL, "invariant"); 6089 assert(_class_name != NULL, "invariant"); 6090 6091 // BEGIN STREAM PARSING 6092 stream->guarantee_more(8, CHECK); // magic, major, minor 6093 // Magic value 6094 const u4 magic = stream->get_u4_fast(); 6095 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 6096 "Incompatible magic value %u in class file %s", 6097 magic, CHECK); 6098 6099 // Version numbers 6100 _minor_version = stream->get_u2_fast(); 6101 _major_version = stream->get_u2_fast(); 6102 6103 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) { 6104 ResourceMark rm; 6105 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 6106 _major_version, _minor_version, _class_name->as_C_string()); 6107 Exceptions::fthrow( 6108 THREAD_AND_LOCATION, 6109 vmSymbols::java_lang_UnsupportedClassVersionError(), 6110 "Unsupported major.minor version for dump time %u.%u", 6111 _major_version, 6112 _minor_version); 6113 } 6114 6115 // Check version numbers - we check this even with verifier off 6116 if (!is_supported_version(_major_version, _minor_version)) { 6117 ResourceMark rm(THREAD); 6118 Exceptions::fthrow( 6119 THREAD_AND_LOCATION, 6120 vmSymbols::java_lang_UnsupportedClassVersionError(), 6121 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 6122 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 6123 _class_name->as_C_string(), 6124 _major_version, 6125 _minor_version, 6126 JVM_CLASSFILE_MAJOR_VERSION, 6127 JVM_CLASSFILE_MINOR_VERSION); 6128 return; 6129 } 6130 6131 stream->guarantee_more(3, CHECK); // length, first cp tag 6132 u2 cp_size = stream->get_u2_fast(); 6133 6134 guarantee_property( 6135 cp_size >= 1, "Illegal constant pool size %u in class file %s", 6136 cp_size, CHECK); 6137 6138 _orig_cp_size = cp_size; 6139 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 6140 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 6141 } 6142 cp_size += _max_num_patched_klasses; 6143 6144 _cp = ConstantPool::allocate(_loader_data, 6145 cp_size, 6146 CHECK); 6147 6148 ConstantPool* const cp = _cp; 6149 6150 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6151 6152 assert(cp_size == (const u2)cp->length(), "invariant"); 6153 6154 // ACCESS FLAGS 6155 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6156 6157 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS; 6158 // JVM_ACC_MODULE is defined in JDK-9 and later. 6159 if (_major_version >= JAVA_9_VERSION) { 6160 recognized_modifiers |= JVM_ACC_MODULE; 6161 } 6162 // JVM_ACC_VALUE is defined for class file version 53.1 and later 6163 if (supports_value_types()) { 6164 recognized_modifiers |= JVM_ACC_VALUE; 6165 } 6166 6167 // Access flags 6168 jint flags = stream->get_u2_fast() & recognized_modifiers; 6169 6170 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6171 // Set abstract bit for old class files for backward compatibility 6172 flags |= JVM_ACC_ABSTRACT; 6173 } 6174 6175 verify_legal_class_modifiers(flags, CHECK); 6176 6177 short bad_constant = class_bad_constant_seen(); 6178 if (bad_constant != 0) { 6179 // Do not throw CFE until after the access_flags are checked because if 6180 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6181 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 6182 } 6183 6184 _access_flags.set_flags(flags); 6185 6186 // This class and superclass 6187 _this_class_index = stream->get_u2_fast(); 6188 check_property( 6189 (valid_cp_range(_this_class_index, cp_size) && 6190 (cp->tag_at(_this_class_index).is_unresolved_klass() || 6191 cp->tag_at(_this_class_index).is_unresolved_value_type())), 6192 "Invalid this class index %u in constant pool in class file %s", 6193 _this_class_index, CHECK); 6194 6195 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6196 assert(class_name_in_cp != NULL, "class_name can't be null"); 6197 6198 // Update _class_name which could be null previously 6199 // to reflect the name in the constant pool 6200 _class_name = class_name_in_cp; 6201 6202 // Don't need to check whether this class name is legal or not. 6203 // It has been checked when constant pool is parsed. 6204 // However, make sure it is not an array type. 6205 if (_need_verify) { 6206 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 6207 "Bad class name in class file %s", 6208 CHECK); 6209 } 6210 6211 // Checks if name in class file matches requested name 6212 if (_requested_name != NULL && _requested_name != _class_name) { 6213 ResourceMark rm(THREAD); 6214 Exceptions::fthrow( 6215 THREAD_AND_LOCATION, 6216 vmSymbols::java_lang_NoClassDefFoundError(), 6217 "%s (wrong name: %s)", 6218 _class_name->as_C_string(), 6219 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 6220 ); 6221 return; 6222 } 6223 6224 // if this is an anonymous class fix up its name if it's in the unnamed 6225 // package. Otherwise, throw IAE if it is in a different package than 6226 // its host class. 6227 if (_host_klass != NULL) { 6228 fix_anonymous_class_name(CHECK); 6229 } 6230 6231 // Verification prevents us from creating names with dots in them, this 6232 // asserts that that's the case. 6233 assert(is_internal_format(_class_name), "external class name format used internally"); 6234 6235 if (!is_internal()) { 6236 LogTarget(Debug, class, preorder) lt; 6237 if (lt.is_enabled()){ 6238 ResourceMark rm(THREAD); 6239 LogStream ls(lt); 6240 ls.print("%s", _class_name->as_klass_external_name()); 6241 if (stream->source() != NULL) { 6242 ls.print(" source: %s", stream->source()); 6243 } 6244 ls.cr(); 6245 } 6246 6247 #if INCLUDE_CDS 6248 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6249 if (!ClassLoader::has_jrt_entry()) { 6250 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6251 DumpLoadedClassList = NULL; 6252 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6253 _host_klass == NULL) { 6254 // Only dump the classes that can be stored into CDS archive. 6255 // Anonymous classes such as generated LambdaForm classes are also not included. 6256 oop class_loader = _loader_data->class_loader(); 6257 ResourceMark rm(THREAD); 6258 bool skip = false; 6259 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6260 // For the boot and platform class loaders, skip classes that are not found in the 6261 // java runtime image, such as those found in the --patch-module entries. 6262 // These classes can't be loaded from the archive during runtime. 6263 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) { 6264 skip = true; 6265 } 6266 6267 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6268 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6269 // as they can be loaded from the archive during runtime. 6270 skip = false; 6271 } 6272 } 6273 if (skip) { 6274 tty->print_cr("skip writing class %s from source %s to classlist file", 6275 _class_name->as_C_string(), stream->source()); 6276 } else { 6277 classlist_file->print_cr("%s", _class_name->as_C_string()); 6278 classlist_file->flush(); 6279 } 6280 } 6281 } 6282 #endif 6283 } 6284 6285 // SUPERKLASS 6286 _super_class_index = stream->get_u2_fast(); 6287 _super_klass = parse_super_class(cp, 6288 _super_class_index, 6289 _need_verify, 6290 CHECK); 6291 6292 // Interfaces 6293 _itfs_len = stream->get_u2_fast(); 6294 parse_interfaces(stream, 6295 _itfs_len, 6296 cp, 6297 &_has_nonstatic_concrete_methods, 6298 CHECK); 6299 6300 assert(_local_interfaces != NULL, "invariant"); 6301 6302 // Fields (offsets are filled in later) 6303 _fac = new FieldAllocationCount(); 6304 parse_fields(stream, 6305 _access_flags.is_interface(), 6306 _access_flags.is_value_type(), 6307 _fac, 6308 cp, 6309 cp_size, 6310 &_java_fields_count, 6311 CHECK); 6312 6313 assert(_fields != NULL, "invariant"); 6314 6315 // Methods 6316 AccessFlags promoted_flags; 6317 parse_methods(stream, 6318 _access_flags.is_interface(), 6319 &promoted_flags, 6320 &_has_final_method, 6321 &_declares_nonstatic_concrete_methods, 6322 CHECK); 6323 6324 assert(_methods != NULL, "invariant"); 6325 6326 // promote flags from parse_methods() to the klass' flags 6327 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6328 6329 if (_declares_nonstatic_concrete_methods) { 6330 _has_nonstatic_concrete_methods = true; 6331 } 6332 6333 // Additional attributes/annotations 6334 _parsed_annotations = new ClassAnnotationCollector(); 6335 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6336 6337 assert(_inner_classes != NULL, "invariant"); 6338 6339 // Finalize the Annotations metadata object, 6340 // now that all annotation arrays have been created. 6341 create_combined_annotations(CHECK); 6342 6343 // Make sure this is the end of class file stream 6344 guarantee_property(stream->at_eos(), 6345 "Extra bytes at the end of class file %s", 6346 CHECK); 6347 6348 // all bytes in stream read and parsed 6349 } 6350 6351 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6352 ConstantPool* cp, 6353 TRAPS) { 6354 assert(stream != NULL, "invariant"); 6355 assert(stream->at_eos(), "invariant"); 6356 assert(cp != NULL, "invariant"); 6357 assert(_loader_data != NULL, "invariant"); 6358 6359 if (_class_name == vmSymbols::java_lang_Object()) { 6360 check_property(_local_interfaces == Universe::the_empty_klass_array(), 6361 "java.lang.Object cannot implement an interface in class file %s", 6362 CHECK); 6363 } 6364 // We check super class after class file is parsed and format is checked 6365 if (_super_class_index > 0 && NULL ==_super_klass) { 6366 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6367 if (_access_flags.is_interface()) { 6368 // Before attempting to resolve the superclass, check for class format 6369 // errors not checked yet. 6370 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6371 "Interfaces must have java.lang.Object as superclass in class file %s", 6372 CHECK); 6373 } 6374 Handle loader(THREAD, _loader_data->class_loader()); 6375 _super_klass = (const InstanceKlass*) 6376 SystemDictionary::resolve_super_or_fail(_class_name, 6377 super_class_name, 6378 loader, 6379 _protection_domain, 6380 true, 6381 CHECK); 6382 } 6383 6384 if (_super_klass != NULL) { 6385 if (_super_klass->has_nonstatic_concrete_methods()) { 6386 _has_nonstatic_concrete_methods = true; 6387 } 6388 6389 if (_super_klass->is_interface()) { 6390 ResourceMark rm(THREAD); 6391 Exceptions::fthrow( 6392 THREAD_AND_LOCATION, 6393 vmSymbols::java_lang_IncompatibleClassChangeError(), 6394 "class %s has interface %s as super class", 6395 _class_name->as_klass_external_name(), 6396 _super_klass->external_name() 6397 ); 6398 return; 6399 } 6400 6401 // For a value class, only java/lang/Object is an acceptable super class 6402 if ((EnableValhalla || EnableMVT) && 6403 _access_flags.get_flags() & JVM_ACC_VALUE) { 6404 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(), 6405 "Value class can only inherit java/lang/Object", 6406 CHECK); 6407 } 6408 6409 // Make sure super class is not final 6410 if (_super_klass->is_final()) { 6411 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6412 } 6413 } 6414 6415 // Compute the transitive list of all unique interfaces implemented by this class 6416 _transitive_interfaces = 6417 compute_transitive_interfaces(_super_klass, 6418 _local_interfaces, 6419 _loader_data, 6420 CHECK); 6421 6422 assert(_transitive_interfaces != NULL, "invariant"); 6423 6424 // sort methods 6425 _method_ordering = sort_methods(_methods); 6426 6427 _all_mirandas = new GrowableArray<Method*>(20); 6428 6429 Handle loader(THREAD, _loader_data->class_loader()); 6430 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6431 &_num_miranda_methods, 6432 _all_mirandas, 6433 _super_klass, 6434 _methods, 6435 _access_flags, 6436 _major_version, 6437 loader, 6438 _class_name, 6439 _local_interfaces, 6440 CHECK); 6441 6442 // Size of Java itable (in words) 6443 _itable_size = _access_flags.is_interface() ? 0 : 6444 klassItable::compute_itable_size(_transitive_interfaces); 6445 6446 assert(_fac != NULL, "invariant"); 6447 assert(_parsed_annotations != NULL, "invariant"); 6448 6449 _field_info = new FieldLayoutInfo(); 6450 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6451 6452 // Compute reference typ 6453 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6454 6455 } 6456 6457 void ClassFileParser::set_klass(InstanceKlass* klass) { 6458 6459 #ifdef ASSERT 6460 if (klass != NULL) { 6461 assert(NULL == _klass, "leaking?"); 6462 } 6463 #endif 6464 6465 _klass = klass; 6466 } 6467 6468 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6469 6470 #ifdef ASSERT 6471 if (klass != NULL) { 6472 assert(NULL == _klass_to_deallocate, "leaking?"); 6473 } 6474 #endif 6475 6476 _klass_to_deallocate = klass; 6477 } 6478 6479 // Caller responsible for ResourceMark 6480 // clone stream with rewound position 6481 const ClassFileStream* ClassFileParser::clone_stream() const { 6482 assert(_stream != NULL, "invariant"); 6483 6484 return _stream->clone(); 6485 } 6486 6487 // ---------------------------------------------------------------------------- 6488 // debugging 6489 6490 #ifdef ASSERT 6491 6492 // return true if class_name contains no '.' (internal format is '/') 6493 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6494 if (class_name != NULL) { 6495 ResourceMark rm; 6496 char* name = class_name->as_C_string(); 6497 return strchr(name, '.') == NULL; 6498 } else { 6499 return true; 6500 } 6501 } 6502 6503 #endif