1 /* 2 * Copyright (c) 1997, 2019, 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 "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/allocation.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/annotations.hpp" 48 #include "oops/constantPool.inline.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.inline.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/symbol.hpp" 58 #include "prims/jvmtiExport.hpp" 59 #include "prims/jvmtiThreadState.hpp" 60 #include "runtime/arguments.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/os.hpp" 64 #include "runtime/perfData.hpp" 65 #include "runtime/reflection.hpp" 66 #include "runtime/safepointVerifiers.hpp" 67 #include "runtime/signature.hpp" 68 #include "runtime/timer.hpp" 69 #include "services/classLoadingService.hpp" 70 #include "services/threadService.hpp" 71 #include "utilities/align.hpp" 72 #include "utilities/bitMap.inline.hpp" 73 #include "utilities/copy.hpp" 74 #include "utilities/exceptions.hpp" 75 #include "utilities/globalDefinitions.hpp" 76 #include "utilities/growableArray.hpp" 77 #include "utilities/macros.hpp" 78 #include "utilities/ostream.hpp" 79 #include "utilities/resourceHash.hpp" 80 #if INCLUDE_CDS 81 #include "classfile/systemDictionaryShared.hpp" 82 #endif 83 #if INCLUDE_JFR 84 #include "jfr/support/jfrTraceIdExtension.hpp" 85 #endif 86 87 // We generally try to create the oops directly when parsing, rather than 88 // allocating temporary data structures and copying the bytes twice. A 89 // temporary area is only needed when parsing utf8 entries in the constant 90 // pool and when parsing line number tables. 91 92 // We add assert in debug mode when class format is not checked. 93 94 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 95 #define JAVA_MIN_SUPPORTED_VERSION 45 96 #define JAVA_PREVIEW_MINOR_VERSION 65535 97 98 // Used for two backward compatibility reasons: 99 // - to check for new additions to the class file format in JDK1.5 100 // - to check for bug fixes in the format checker in JDK1.5 101 #define JAVA_1_5_VERSION 49 102 103 // Used for backward compatibility reasons: 104 // - to check for javac bug fixes that happened after 1.5 105 // - also used as the max version when running in jdk6 106 #define JAVA_6_VERSION 50 107 108 // Used for backward compatibility reasons: 109 // - to disallow argument and require ACC_STATIC for <clinit> methods 110 #define JAVA_7_VERSION 51 111 112 // Extension method support. 113 #define JAVA_8_VERSION 52 114 115 #define JAVA_9_VERSION 53 116 117 #define JAVA_10_VERSION 54 118 119 #define JAVA_11_VERSION 55 120 121 #define JAVA_12_VERSION 56 122 123 #define JAVA_13_VERSION 57 124 125 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 126 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION, 127 "Unexpected bad constant pool entry"); 128 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 129 } 130 131 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 132 ConstantPool* cp, 133 const int length, 134 TRAPS) { 135 assert(stream != NULL, "invariant"); 136 assert(cp != NULL, "invariant"); 137 138 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 139 // this function (_current can be allocated in a register, with scalar 140 // replacement of aggregates). The _current pointer is copied back to 141 // stream() when this function returns. DON'T call another method within 142 // this method that uses stream(). 143 const ClassFileStream cfs1 = *stream; 144 const ClassFileStream* const cfs = &cfs1; 145 146 assert(cfs->allocated_on_stack(), "should be local"); 147 debug_only(const u1* const old_current = stream->current();) 148 149 // Used for batching symbol allocations. 150 const char* names[SymbolTable::symbol_alloc_batch_size]; 151 int lengths[SymbolTable::symbol_alloc_batch_size]; 152 int indices[SymbolTable::symbol_alloc_batch_size]; 153 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 154 int names_count = 0; 155 156 // parsing Index 0 is unused 157 for (int index = 1; index < length; index++) { 158 // Each of the following case guarantees one more byte in the stream 159 // for the following tag or the access_flags following constant pool, 160 // so we don't need bounds-check for reading tag. 161 const u1 tag = cfs->get_u1_fast(); 162 switch (tag) { 163 case JVM_CONSTANT_Class : { 164 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 165 const u2 name_index = cfs->get_u2_fast(); 166 cp->klass_index_at_put(index, name_index); 167 break; 168 } 169 case JVM_CONSTANT_Fieldref: { 170 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 171 const u2 class_index = cfs->get_u2_fast(); 172 const u2 name_and_type_index = cfs->get_u2_fast(); 173 cp->field_at_put(index, class_index, name_and_type_index); 174 break; 175 } 176 case JVM_CONSTANT_Methodref: { 177 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 178 const u2 class_index = cfs->get_u2_fast(); 179 const u2 name_and_type_index = cfs->get_u2_fast(); 180 cp->method_at_put(index, class_index, name_and_type_index); 181 break; 182 } 183 case JVM_CONSTANT_InterfaceMethodref: { 184 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 185 const u2 class_index = cfs->get_u2_fast(); 186 const u2 name_and_type_index = cfs->get_u2_fast(); 187 cp->interface_method_at_put(index, class_index, name_and_type_index); 188 break; 189 } 190 case JVM_CONSTANT_String : { 191 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 192 const u2 string_index = cfs->get_u2_fast(); 193 cp->string_index_at_put(index, string_index); 194 break; 195 } 196 case JVM_CONSTANT_MethodHandle : 197 case JVM_CONSTANT_MethodType: { 198 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 199 classfile_parse_error( 200 "Class file version does not support constant tag %u in class file %s", 201 tag, CHECK); 202 } 203 if (tag == JVM_CONSTANT_MethodHandle) { 204 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 205 const u1 ref_kind = cfs->get_u1_fast(); 206 const u2 method_index = cfs->get_u2_fast(); 207 cp->method_handle_index_at_put(index, ref_kind, method_index); 208 } 209 else if (tag == JVM_CONSTANT_MethodType) { 210 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 211 const u2 signature_index = cfs->get_u2_fast(); 212 cp->method_type_index_at_put(index, signature_index); 213 } 214 else { 215 ShouldNotReachHere(); 216 } 217 break; 218 } 219 case JVM_CONSTANT_Dynamic : { 220 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 221 classfile_parse_error( 222 "Class file version does not support constant tag %u in class file %s", 223 tag, CHECK); 224 } 225 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 226 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 227 const u2 name_and_type_index = cfs->get_u2_fast(); 228 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 229 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 230 } 231 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 232 break; 233 } 234 case JVM_CONSTANT_InvokeDynamic : { 235 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 236 classfile_parse_error( 237 "Class file version does not support constant tag %u in class file %s", 238 tag, CHECK); 239 } 240 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 241 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 242 const u2 name_and_type_index = cfs->get_u2_fast(); 243 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 244 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 245 } 246 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 247 break; 248 } 249 case JVM_CONSTANT_Integer: { 250 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 251 const u4 bytes = cfs->get_u4_fast(); 252 cp->int_at_put(index, (jint)bytes); 253 break; 254 } 255 case JVM_CONSTANT_Float: { 256 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 257 const u4 bytes = cfs->get_u4_fast(); 258 cp->float_at_put(index, *(jfloat*)&bytes); 259 break; 260 } 261 case JVM_CONSTANT_Long: { 262 // A mangled type might cause you to overrun allocated memory 263 guarantee_property(index + 1 < length, 264 "Invalid constant pool entry %u in class file %s", 265 index, 266 CHECK); 267 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 268 const u8 bytes = cfs->get_u8_fast(); 269 cp->long_at_put(index, bytes); 270 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 271 break; 272 } 273 case JVM_CONSTANT_Double: { 274 // A mangled type might cause you to overrun allocated memory 275 guarantee_property(index+1 < length, 276 "Invalid constant pool entry %u in class file %s", 277 index, 278 CHECK); 279 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 280 const u8 bytes = cfs->get_u8_fast(); 281 cp->double_at_put(index, *(jdouble*)&bytes); 282 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 283 break; 284 } 285 case JVM_CONSTANT_NameAndType: { 286 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 287 const u2 name_index = cfs->get_u2_fast(); 288 const u2 signature_index = cfs->get_u2_fast(); 289 cp->name_and_type_at_put(index, name_index, signature_index); 290 break; 291 } 292 case JVM_CONSTANT_Utf8 : { 293 cfs->guarantee_more(2, CHECK); // utf8_length 294 u2 utf8_length = cfs->get_u2_fast(); 295 const u1* utf8_buffer = cfs->current(); 296 assert(utf8_buffer != NULL, "null utf8 buffer"); 297 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 298 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 299 cfs->skip_u1_fast(utf8_length); 300 301 // Before storing the symbol, make sure it's legal 302 if (_need_verify) { 303 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 304 } 305 306 if (has_cp_patch_at(index)) { 307 Handle patch = clear_cp_patch_at(index); 308 guarantee_property(java_lang_String::is_instance(patch()), 309 "Illegal utf8 patch at %d in class file %s", 310 index, 311 CHECK); 312 const char* const str = java_lang_String::as_utf8_string(patch()); 313 // (could use java_lang_String::as_symbol instead, but might as well batch them) 314 utf8_buffer = (const u1*) str; 315 utf8_length = (u2) strlen(str); 316 } 317 318 unsigned int hash; 319 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 320 utf8_length, 321 hash); 322 if (result == NULL) { 323 names[names_count] = (const char*)utf8_buffer; 324 lengths[names_count] = utf8_length; 325 indices[names_count] = index; 326 hashValues[names_count++] = hash; 327 if (names_count == SymbolTable::symbol_alloc_batch_size) { 328 SymbolTable::new_symbols(_loader_data, 329 cp, 330 names_count, 331 names, 332 lengths, 333 indices, 334 hashValues, 335 CHECK); 336 names_count = 0; 337 } 338 } else { 339 cp->symbol_at_put(index, result); 340 } 341 break; 342 } 343 case 19: 344 case 20: { 345 // Record that an error occurred in these two cases but keep parsing so 346 // that ACC_Module can be checked for in the access_flags. Need to 347 // throw NoClassDefFoundError in that case. 348 if (_major_version >= JAVA_9_VERSION) { 349 cfs->guarantee_more(3, CHECK); 350 cfs->get_u2_fast(); 351 set_class_bad_constant_seen(tag); 352 break; 353 } 354 } 355 default: { 356 classfile_parse_error("Unknown constant tag %u in class file %s", 357 tag, 358 CHECK); 359 break; 360 } 361 } // end of switch(tag) 362 } // end of for 363 364 // Allocate the remaining symbols 365 if (names_count > 0) { 366 SymbolTable::new_symbols(_loader_data, 367 cp, 368 names_count, 369 names, 370 lengths, 371 indices, 372 hashValues, 373 CHECK); 374 } 375 376 // Copy _current pointer of local copy back to stream. 377 assert(stream->current() == old_current, "non-exclusive use of stream"); 378 stream->set_current(cfs1.current()); 379 380 } 381 382 static inline bool valid_cp_range(int index, int length) { 383 return (index > 0 && index < length); 384 } 385 386 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 387 assert(cp != NULL, "invariant"); 388 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 389 return cp->symbol_at(index); 390 } 391 return NULL; 392 } 393 394 #ifdef ASSERT 395 PRAGMA_DIAG_PUSH 396 PRAGMA_FORMAT_NONLITERAL_IGNORED 397 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 398 ResourceMark rm(THREAD); 399 fatal(msg, _class_name->as_C_string()); 400 } 401 402 void ClassFileParser::report_assert_property_failure(const char* msg, 403 int index, 404 TRAPS) const { 405 ResourceMark rm(THREAD); 406 fatal(msg, index, _class_name->as_C_string()); 407 } 408 PRAGMA_DIAG_POP 409 #endif 410 411 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 412 ConstantPool* const cp, 413 const int length, 414 TRAPS) { 415 assert(cp != NULL, "invariant"); 416 assert(stream != NULL, "invariant"); 417 418 // parsing constant pool entries 419 parse_constant_pool_entries(stream, cp, length, CHECK); 420 if (class_bad_constant_seen() != 0) { 421 // a bad CP entry has been detected previously so stop parsing and just return. 422 return; 423 } 424 425 int index = 1; // declared outside of loops for portability 426 int num_klasses = 0; 427 428 // first verification pass - validate cross references 429 // and fixup class and string constants 430 for (index = 1; index < length; index++) { // Index 0 is unused 431 const jbyte tag = cp->tag_at(index).value(); 432 switch (tag) { 433 case JVM_CONSTANT_Class: { 434 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 435 break; 436 } 437 case JVM_CONSTANT_Fieldref: 438 // fall through 439 case JVM_CONSTANT_Methodref: 440 // fall through 441 case JVM_CONSTANT_InterfaceMethodref: { 442 if (!_need_verify) break; 443 const int klass_ref_index = cp->klass_ref_index_at(index); 444 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 445 check_property(valid_klass_reference_at(klass_ref_index), 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 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 496 break; 497 } 498 case JVM_CONSTANT_StringIndex: { 499 const int string_index = cp->string_index_at(index); 500 check_property(valid_symbol_at(string_index), 501 "Invalid constant pool index %u in class file %s", 502 string_index, CHECK); 503 Symbol* const sym = cp->symbol_at(string_index); 504 cp->unresolved_string_at_put(index, sym); 505 break; 506 } 507 case JVM_CONSTANT_MethodHandle: { 508 const int ref_index = cp->method_handle_index_at(index); 509 check_property(valid_cp_range(ref_index, length), 510 "Invalid constant pool index %u in class file %s", 511 ref_index, CHECK); 512 const constantTag tag = cp->tag_at(ref_index); 513 const int ref_kind = cp->method_handle_ref_kind_at(index); 514 515 switch (ref_kind) { 516 case JVM_REF_getField: 517 case JVM_REF_getStatic: 518 case JVM_REF_putField: 519 case JVM_REF_putStatic: { 520 check_property( 521 tag.is_field(), 522 "Invalid constant pool index %u in class file %s (not a field)", 523 ref_index, CHECK); 524 break; 525 } 526 case JVM_REF_invokeVirtual: 527 case JVM_REF_newInvokeSpecial: { 528 check_property( 529 tag.is_method(), 530 "Invalid constant pool index %u in class file %s (not a method)", 531 ref_index, CHECK); 532 break; 533 } 534 case JVM_REF_invokeStatic: 535 case JVM_REF_invokeSpecial: { 536 check_property( 537 tag.is_method() || 538 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 539 "Invalid constant pool index %u in class file %s (not a method)", 540 ref_index, CHECK); 541 break; 542 } 543 case JVM_REF_invokeInterface: { 544 check_property( 545 tag.is_interface_method(), 546 "Invalid constant pool index %u in class file %s (not an interface method)", 547 ref_index, CHECK); 548 break; 549 } 550 default: { 551 classfile_parse_error( 552 "Bad method handle kind at constant pool index %u in class file %s", 553 index, CHECK); 554 } 555 } // switch(refkind) 556 // Keep the ref_index unchanged. It will be indirected at link-time. 557 break; 558 } // case MethodHandle 559 case JVM_CONSTANT_MethodType: { 560 const int ref_index = cp->method_type_index_at(index); 561 check_property(valid_symbol_at(ref_index), 562 "Invalid constant pool index %u in class file %s", 563 ref_index, CHECK); 564 break; 565 } 566 case JVM_CONSTANT_Dynamic: { 567 const int name_and_type_ref_index = 568 cp->bootstrap_name_and_type_ref_index_at(index); 569 570 check_property(valid_cp_range(name_and_type_ref_index, length) && 571 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 572 "Invalid constant pool index %u in class file %s", 573 name_and_type_ref_index, CHECK); 574 // bootstrap specifier index must be checked later, 575 // when BootstrapMethods attr is available 576 577 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 578 cp->set_has_dynamic_constant(); 579 break; 580 } 581 case JVM_CONSTANT_InvokeDynamic: { 582 const int name_and_type_ref_index = 583 cp->bootstrap_name_and_type_ref_index_at(index); 584 585 check_property(valid_cp_range(name_and_type_ref_index, length) && 586 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 587 "Invalid constant pool index %u in class file %s", 588 name_and_type_ref_index, CHECK); 589 // bootstrap specifier index must be checked later, 590 // when BootstrapMethods attr is available 591 break; 592 } 593 default: { 594 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 595 ShouldNotReachHere(); 596 break; 597 } 598 } // switch(tag) 599 } // end of for 600 601 _first_patched_klass_resolved_index = num_klasses; 602 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 603 604 if (_cp_patches != NULL) { 605 // need to treat this_class specially... 606 607 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 608 // for now. These will be replaced with actual names of the patched classes in patch_class(). 609 Symbol* s = vmSymbols::star_name(); 610 for (int n=_orig_cp_size; n<cp->length(); n++) { 611 cp->symbol_at_put(n, s); 612 } 613 614 int this_class_index; 615 { 616 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 617 const u1* const mark = stream->current(); 618 stream->skip_u2_fast(1); // skip flags 619 this_class_index = stream->get_u2_fast(); 620 stream->set_current(mark); // revert to mark 621 } 622 623 for (index = 1; index < length; index++) { // Index 0 is unused 624 if (has_cp_patch_at(index)) { 625 guarantee_property(index != this_class_index, 626 "Illegal constant pool patch to self at %d in class file %s", 627 index, CHECK); 628 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 629 } 630 } 631 } 632 633 if (!_need_verify) { 634 return; 635 } 636 637 // second verification pass - checks the strings are of the right format. 638 // but not yet to the other entries 639 for (index = 1; index < length; index++) { 640 const jbyte tag = cp->tag_at(index).value(); 641 switch (tag) { 642 case JVM_CONSTANT_UnresolvedClass: { 643 const Symbol* const class_name = cp->klass_name_at(index); 644 // check the name, even if _cp_patches will overwrite it 645 verify_legal_class_name(class_name, CHECK); 646 break; 647 } 648 case JVM_CONSTANT_NameAndType: { 649 if (_need_verify) { 650 const int sig_index = cp->signature_ref_index_at(index); 651 const int name_index = cp->name_ref_index_at(index); 652 const Symbol* const name = cp->symbol_at(name_index); 653 const Symbol* const sig = cp->symbol_at(sig_index); 654 guarantee_property(sig->utf8_length() != 0, 655 "Illegal zero length constant pool entry at %d in class %s", 656 sig_index, CHECK); 657 guarantee_property(name->utf8_length() != 0, 658 "Illegal zero length constant pool entry at %d in class %s", 659 name_index, CHECK); 660 661 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) { 662 // Format check method name and signature 663 verify_legal_method_name(name, CHECK); 664 verify_legal_method_signature(name, sig, CHECK); 665 } else { 666 // Format check field name and signature 667 verify_legal_field_name(name, CHECK); 668 verify_legal_field_signature(name, sig, CHECK); 669 } 670 } 671 break; 672 } 673 case JVM_CONSTANT_Dynamic: { 674 const int name_and_type_ref_index = 675 cp->name_and_type_ref_index_at(index); 676 // already verified to be utf8 677 const int name_ref_index = 678 cp->name_ref_index_at(name_and_type_ref_index); 679 // already verified to be utf8 680 const int signature_ref_index = 681 cp->signature_ref_index_at(name_and_type_ref_index); 682 const Symbol* const name = cp->symbol_at(name_ref_index); 683 const Symbol* const signature = cp->symbol_at(signature_ref_index); 684 if (_need_verify) { 685 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 686 // Need only to be sure signature is non-zero length and the right type. 687 if (signature->utf8_length() == 0 || 688 signature->char_at(0) == JVM_SIGNATURE_FUNC) { 689 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 690 } 691 } 692 break; 693 } 694 case JVM_CONSTANT_InvokeDynamic: 695 case JVM_CONSTANT_Fieldref: 696 case JVM_CONSTANT_Methodref: 697 case JVM_CONSTANT_InterfaceMethodref: { 698 const int name_and_type_ref_index = 699 cp->name_and_type_ref_index_at(index); 700 // already verified to be utf8 701 const int name_ref_index = 702 cp->name_ref_index_at(name_and_type_ref_index); 703 // already verified to be utf8 704 const int signature_ref_index = 705 cp->signature_ref_index_at(name_and_type_ref_index); 706 const Symbol* const name = cp->symbol_at(name_ref_index); 707 const Symbol* const signature = cp->symbol_at(signature_ref_index); 708 if (tag == JVM_CONSTANT_Fieldref) { 709 if (_need_verify) { 710 // Field name and signature are verified above, when iterating NameAndType_info. 711 // Need only to be sure signature is non-zero length and the right type. 712 if (signature->utf8_length() == 0 || 713 signature->char_at(0) == JVM_SIGNATURE_FUNC) { 714 throwIllegalSignature("Field", name, signature, CHECK); 715 } 716 } 717 } else { 718 if (_need_verify) { 719 // Method name and signature are verified above, when iterating NameAndType_info. 720 // Need only to be sure signature is non-zero length and the right type. 721 if (signature->utf8_length() == 0 || 722 signature->char_at(0) != JVM_SIGNATURE_FUNC) { 723 throwIllegalSignature("Method", name, signature, CHECK); 724 } 725 } 726 // 4509014: If a class method name begins with '<', it must be "<init>" 727 const unsigned int name_len = name->utf8_length(); 728 if (tag == JVM_CONSTANT_Methodref && 729 name_len != 0 && 730 name->char_at(0) == '<' && 731 name != vmSymbols::object_initializer_name()) { 732 classfile_parse_error( 733 "Bad method name at constant pool index %u in class file %s", 734 name_ref_index, CHECK); 735 } 736 } 737 break; 738 } 739 case JVM_CONSTANT_MethodHandle: { 740 const int ref_index = cp->method_handle_index_at(index); 741 const int ref_kind = cp->method_handle_ref_kind_at(index); 742 switch (ref_kind) { 743 case JVM_REF_invokeVirtual: 744 case JVM_REF_invokeStatic: 745 case JVM_REF_invokeSpecial: 746 case JVM_REF_newInvokeSpecial: { 747 const int name_and_type_ref_index = 748 cp->name_and_type_ref_index_at(ref_index); 749 const int name_ref_index = 750 cp->name_ref_index_at(name_and_type_ref_index); 751 const Symbol* const name = cp->symbol_at(name_ref_index); 752 if (ref_kind == JVM_REF_newInvokeSpecial) { 753 if (name != vmSymbols::object_initializer_name()) { 754 classfile_parse_error( 755 "Bad constructor name at constant pool index %u in class file %s", 756 name_ref_index, CHECK); 757 } 758 } else { 759 if (name == vmSymbols::object_initializer_name()) { 760 classfile_parse_error( 761 "Bad method name at constant pool index %u in class file %s", 762 name_ref_index, CHECK); 763 } 764 } 765 break; 766 } 767 // Other ref_kinds are already fully checked in previous pass. 768 } // switch(ref_kind) 769 break; 770 } 771 case JVM_CONSTANT_MethodType: { 772 const Symbol* const no_name = vmSymbols::type_name(); // place holder 773 const Symbol* const signature = cp->method_type_signature_at(index); 774 verify_legal_method_signature(no_name, signature, CHECK); 775 break; 776 } 777 case JVM_CONSTANT_Utf8: { 778 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 779 } 780 } // switch(tag) 781 } // end of for 782 } 783 784 Handle ClassFileParser::clear_cp_patch_at(int index) { 785 Handle patch = cp_patch_at(index); 786 _cp_patches->at_put(index, Handle()); 787 assert(!has_cp_patch_at(index), ""); 788 return patch; 789 } 790 791 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) { 792 int name_index = _orig_cp_size + _num_patched_klasses; 793 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses; 794 795 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name); 796 _num_patched_klasses ++; 797 } 798 799 void ClassFileParser::patch_constant_pool(ConstantPool* cp, 800 int index, 801 Handle patch, 802 TRAPS) { 803 assert(cp != NULL, "invariant"); 804 805 BasicType patch_type = T_VOID; 806 807 switch (cp->tag_at(index).value()) { 808 809 case JVM_CONSTANT_UnresolvedClass: { 810 // Patching a class means pre-resolving it. 811 // The name in the constant pool is ignored. 812 if (java_lang_Class::is_instance(patch())) { 813 guarantee_property(!java_lang_Class::is_primitive(patch()), 814 "Illegal class patch at %d in class file %s", 815 index, CHECK); 816 Klass* k = java_lang_Class::as_Klass(patch()); 817 patch_class(cp, index, k, k->name()); 818 } else { 819 guarantee_property(java_lang_String::is_instance(patch()), 820 "Illegal class patch at %d in class file %s", 821 index, CHECK); 822 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK); 823 patch_class(cp, index, NULL, name); 824 } 825 break; 826 } 827 828 case JVM_CONSTANT_String: { 829 // skip this patch and don't clear it. Needs the oop array for resolved 830 // references to be created first. 831 return; 832 } 833 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 834 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 835 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 836 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 837 patch_prim: 838 { 839 jvalue value; 840 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 841 guarantee_property(value_type == patch_type, 842 "Illegal primitive patch at %d in class file %s", 843 index, CHECK); 844 switch (value_type) { 845 case T_INT: cp->int_at_put(index, value.i); break; 846 case T_FLOAT: cp->float_at_put(index, value.f); break; 847 case T_LONG: cp->long_at_put(index, value.j); break; 848 case T_DOUBLE: cp->double_at_put(index, value.d); break; 849 default: assert(false, ""); 850 } 851 } // end patch_prim label 852 break; 853 854 default: { 855 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 856 guarantee_property(!has_cp_patch_at(index), 857 "Illegal unexpected patch at %d in class file %s", 858 index, CHECK); 859 return; 860 } 861 } // end of switch(tag) 862 863 // On fall-through, mark the patch as used. 864 clear_cp_patch_at(index); 865 } 866 class NameSigHash: public ResourceObj { 867 public: 868 const Symbol* _name; // name 869 const Symbol* _sig; // signature 870 NameSigHash* _next; // Next entry in hash table 871 }; 872 873 static const int HASH_ROW_SIZE = 256; 874 875 static unsigned int hash(const Symbol* name, const Symbol* sig) { 876 unsigned int raw_hash = 0; 877 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 878 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 879 880 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 881 } 882 883 884 static void initialize_hashtable(NameSigHash** table) { 885 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 886 } 887 // Return false if the name/sig combination is found in table. 888 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 889 // The old format checker uses heap sort to find duplicates. 890 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 891 // of table since we don't expect Symbol*'s to move. 892 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 893 assert(name != NULL, "name in constant pool is NULL"); 894 895 // First lookup for duplicates 896 int index = hash(name, sig); 897 NameSigHash* entry = table[index]; 898 while (entry != NULL) { 899 if (entry->_name == name && entry->_sig == sig) { 900 return false; 901 } 902 entry = entry->_next; 903 } 904 905 // No duplicate is found, allocate a new entry and fill it. 906 entry = new NameSigHash(); 907 entry->_name = name; 908 entry->_sig = sig; 909 910 // Insert into hash table 911 entry->_next = table[index]; 912 table[index] = entry; 913 914 return true; 915 } 916 917 // Side-effects: populates the _local_interfaces field 918 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 919 const int itfs_len, 920 ConstantPool* const cp, 921 bool* const has_nonstatic_concrete_methods, 922 TRAPS) { 923 assert(stream != NULL, "invariant"); 924 assert(cp != NULL, "invariant"); 925 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 926 927 if (itfs_len == 0) { 928 _local_interfaces = Universe::the_empty_instance_klass_array(); 929 } else { 930 assert(itfs_len > 0, "only called for len>0"); 931 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK); 932 933 int index; 934 for (index = 0; index < itfs_len; index++) { 935 const u2 interface_index = stream->get_u2(CHECK); 936 Klass* interf; 937 check_property( 938 valid_klass_reference_at(interface_index), 939 "Interface name has bad constant pool index %u in class file %s", 940 interface_index, CHECK); 941 if (cp->tag_at(interface_index).is_klass()) { 942 interf = cp->resolved_klass_at(interface_index); 943 } else { 944 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 945 946 // Don't need to check legal name because it's checked when parsing constant pool. 947 // But need to make sure it's not an array type. 948 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 949 "Bad interface name in class file %s", CHECK); 950 951 // Call resolve_super so classcircularity is checked 952 interf = SystemDictionary::resolve_super_or_fail( 953 _class_name, 954 unresolved_klass, 955 Handle(THREAD, _loader_data->class_loader()), 956 _protection_domain, 957 false, 958 CHECK); 959 } 960 961 if (!interf->is_interface()) { 962 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 963 err_msg("class %s can not implement %s, because it is not an interface (%s)", 964 _class_name->as_klass_external_name(), 965 interf->external_name(), 966 interf->class_in_module_of_loader())); 967 } 968 969 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 970 *has_nonstatic_concrete_methods = true; 971 } 972 _local_interfaces->at_put(index, InstanceKlass::cast(interf)); 973 } 974 975 if (!_need_verify || itfs_len <= 1) { 976 return; 977 } 978 979 // Check if there's any duplicates in interfaces 980 ResourceMark rm(THREAD); 981 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 982 NameSigHash*, 983 HASH_ROW_SIZE); 984 initialize_hashtable(interface_names); 985 bool dup = false; 986 const Symbol* name = NULL; 987 { 988 debug_only(NoSafepointVerifier nsv;) 989 for (index = 0; index < itfs_len; index++) { 990 const InstanceKlass* const k = _local_interfaces->at(index); 991 name = k->name(); 992 // If no duplicates, add (name, NULL) in hashtable interface_names. 993 if (!put_after_lookup(name, NULL, interface_names)) { 994 dup = true; 995 break; 996 } 997 } 998 } 999 if (dup) { 1000 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 1001 name->as_C_string(), CHECK); 1002 } 1003 } 1004 } 1005 1006 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1007 int constantvalue_index, 1008 int signature_index, 1009 TRAPS) const { 1010 // Make sure the constant pool entry is of a type appropriate to this field 1011 guarantee_property( 1012 (constantvalue_index > 0 && 1013 constantvalue_index < cp->length()), 1014 "Bad initial value index %u in ConstantValue attribute in class file %s", 1015 constantvalue_index, CHECK); 1016 1017 const constantTag value_type = cp->tag_at(constantvalue_index); 1018 switch(cp->basic_type_for_signature_at(signature_index)) { 1019 case T_LONG: { 1020 guarantee_property(value_type.is_long(), 1021 "Inconsistent constant value type in class file %s", 1022 CHECK); 1023 break; 1024 } 1025 case T_FLOAT: { 1026 guarantee_property(value_type.is_float(), 1027 "Inconsistent constant value type in class file %s", 1028 CHECK); 1029 break; 1030 } 1031 case T_DOUBLE: { 1032 guarantee_property(value_type.is_double(), 1033 "Inconsistent constant value type in class file %s", 1034 CHECK); 1035 break; 1036 } 1037 case T_BYTE: 1038 case T_CHAR: 1039 case T_SHORT: 1040 case T_BOOLEAN: 1041 case T_INT: { 1042 guarantee_property(value_type.is_int(), 1043 "Inconsistent constant value type in class file %s", 1044 CHECK); 1045 break; 1046 } 1047 case T_OBJECT: { 1048 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1049 && value_type.is_string()), 1050 "Bad string initial value in class file %s", 1051 CHECK); 1052 break; 1053 } 1054 default: { 1055 classfile_parse_error("Unable to set initial value %u in class file %s", 1056 constantvalue_index, 1057 CHECK); 1058 } 1059 } 1060 } 1061 1062 class AnnotationCollector : public ResourceObj{ 1063 public: 1064 enum Location { _in_field, _in_method, _in_class }; 1065 enum ID { 1066 _unknown = 0, 1067 _method_CallerSensitive, 1068 _method_ForceInline, 1069 _method_DontInline, 1070 _method_InjectedProfile, 1071 _method_LambdaForm_Compiled, 1072 _method_Hidden, 1073 _method_HotSpotIntrinsicCandidate, 1074 _jdk_internal_vm_annotation_Contended, 1075 _field_Stable, 1076 _jdk_internal_vm_annotation_ReservedStackAccess, 1077 _annotation_LIMIT 1078 }; 1079 const Location _location; 1080 int _annotations_present; 1081 u2 _contended_group; 1082 1083 AnnotationCollector(Location location) 1084 : _location(location), _annotations_present(0) 1085 { 1086 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1087 } 1088 // If this annotation name has an ID, report it (or _none). 1089 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 1090 // Set the annotation name: 1091 void set_annotation(ID id) { 1092 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1093 _annotations_present |= nth_bit((int)id); 1094 } 1095 1096 void remove_annotation(ID id) { 1097 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1098 _annotations_present &= ~nth_bit((int)id); 1099 } 1100 1101 // Report if the annotation is present. 1102 bool has_any_annotations() const { return _annotations_present != 0; } 1103 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1104 1105 void set_contended_group(u2 group) { _contended_group = group; } 1106 u2 contended_group() const { return _contended_group; } 1107 1108 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1109 1110 void set_stable(bool stable) { set_annotation(_field_Stable); } 1111 bool is_stable() const { return has_annotation(_field_Stable); } 1112 }; 1113 1114 // This class also doubles as a holder for metadata cleanup. 1115 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1116 private: 1117 ClassLoaderData* _loader_data; 1118 AnnotationArray* _field_annotations; 1119 AnnotationArray* _field_type_annotations; 1120 public: 1121 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1122 AnnotationCollector(_in_field), 1123 _loader_data(loader_data), 1124 _field_annotations(NULL), 1125 _field_type_annotations(NULL) {} 1126 ~FieldAnnotationCollector(); 1127 void apply_to(FieldInfo* f); 1128 AnnotationArray* field_annotations() { return _field_annotations; } 1129 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1130 1131 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1132 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1133 }; 1134 1135 class MethodAnnotationCollector : public AnnotationCollector{ 1136 public: 1137 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1138 void apply_to(const methodHandle& m); 1139 }; 1140 1141 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1142 public: 1143 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1144 void apply_to(InstanceKlass* ik); 1145 }; 1146 1147 1148 static int skip_annotation_value(const u1*, int, int); // fwd decl 1149 1150 // Safely increment index by val if does not pass limit 1151 #define SAFE_ADD(index, limit, val) \ 1152 if (index >= limit - val) return limit; \ 1153 index += val; 1154 1155 // Skip an annotation. Return >=limit if there is any problem. 1156 static int skip_annotation(const u1* buffer, int limit, int index) { 1157 assert(buffer != NULL, "invariant"); 1158 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1159 // value := switch (tag:u1) { ... } 1160 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1161 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1162 while (--nmem >= 0 && index < limit) { 1163 SAFE_ADD(index, limit, 2); // skip member 1164 index = skip_annotation_value(buffer, limit, index); 1165 } 1166 return index; 1167 } 1168 1169 // Skip an annotation value. Return >=limit if there is any problem. 1170 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1171 assert(buffer != NULL, "invariant"); 1172 1173 // value := switch (tag:u1) { 1174 // case B, C, I, S, Z, D, F, J, c: con:u2; 1175 // case e: e_class:u2 e_name:u2; 1176 // case s: s_con:u2; 1177 // case [: do(nval:u2) {value}; 1178 // case @: annotation; 1179 // case s: s_con:u2; 1180 // } 1181 SAFE_ADD(index, limit, 1); // read tag 1182 const u1 tag = buffer[index - 1]; 1183 switch (tag) { 1184 case 'B': 1185 case 'C': 1186 case 'I': 1187 case 'S': 1188 case 'Z': 1189 case 'D': 1190 case 'F': 1191 case 'J': 1192 case 'c': 1193 case 's': 1194 SAFE_ADD(index, limit, 2); // skip con or s_con 1195 break; 1196 case 'e': 1197 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1198 break; 1199 case '[': 1200 { 1201 SAFE_ADD(index, limit, 2); // read nval 1202 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1203 while (--nval >= 0 && index < limit) { 1204 index = skip_annotation_value(buffer, limit, index); 1205 } 1206 } 1207 break; 1208 case '@': 1209 index = skip_annotation(buffer, limit, index); 1210 break; 1211 default: 1212 return limit; // bad tag byte 1213 } 1214 return index; 1215 } 1216 1217 // Sift through annotations, looking for those significant to the VM: 1218 static void parse_annotations(const ConstantPool* const cp, 1219 const u1* buffer, int limit, 1220 AnnotationCollector* coll, 1221 ClassLoaderData* loader_data, 1222 TRAPS) { 1223 1224 assert(cp != NULL, "invariant"); 1225 assert(buffer != NULL, "invariant"); 1226 assert(coll != NULL, "invariant"); 1227 assert(loader_data != NULL, "invariant"); 1228 1229 // annotations := do(nann:u2) {annotation} 1230 int index = 2; // read nann 1231 if (index >= limit) return; 1232 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1233 enum { // initial annotation layout 1234 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1235 count_off = 2, // u2 such as 1 (one value) 1236 member_off = 4, // utf8 such as 'value' 1237 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1238 e_tag_val = 'e', 1239 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1240 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1241 e_size = 11, // end of 'e' annotation 1242 c_tag_val = 'c', // payload is type 1243 c_con_off = 7, // utf8 payload, such as 'I' 1244 c_size = 9, // end of 'c' annotation 1245 s_tag_val = 's', // payload is String 1246 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1247 s_size = 9, 1248 min_size = 6 // smallest possible size (zero members) 1249 }; 1250 // Cannot add min_size to index in case of overflow MAX_INT 1251 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1252 int index0 = index; 1253 index = skip_annotation(buffer, limit, index); 1254 const u1* const abase = buffer + index0; 1255 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1256 const int count = Bytes::get_Java_u2((address)abase + count_off); 1257 const Symbol* const aname = check_symbol_at(cp, atype); 1258 if (aname == NULL) break; // invalid annotation name 1259 const Symbol* member = NULL; 1260 if (count >= 1) { 1261 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1262 member = check_symbol_at(cp, member_index); 1263 if (member == NULL) break; // invalid member name 1264 } 1265 1266 // Here is where parsing particular annotations will take place. 1267 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1268 if (AnnotationCollector::_unknown == id) continue; 1269 coll->set_annotation(id); 1270 1271 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1272 // @Contended can optionally specify the contention group. 1273 // 1274 // Contended group defines the equivalence class over the fields: 1275 // the fields within the same contended group are not treated distinct. 1276 // The only exception is default group, which does not incur the 1277 // equivalence. Naturally, contention group for classes is meaningless. 1278 // 1279 // While the contention group is specified as String, annotation 1280 // values are already interned, and we might as well use the constant 1281 // pool index as the group tag. 1282 // 1283 u2 group_index = 0; // default contended group 1284 if (count == 1 1285 && s_size == (index - index0) // match size 1286 && s_tag_val == *(abase + tag_off) 1287 && member == vmSymbols::value_name()) { 1288 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1289 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1290 group_index = 0; // default contended group 1291 } 1292 } 1293 coll->set_contended_group(group_index); 1294 } 1295 } 1296 } 1297 1298 1299 // Parse attributes for a field. 1300 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1301 u2 attributes_count, 1302 bool is_static, u2 signature_index, 1303 u2* const constantvalue_index_addr, 1304 bool* const is_synthetic_addr, 1305 u2* const generic_signature_index_addr, 1306 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1307 TRAPS) { 1308 assert(cfs != NULL, "invariant"); 1309 assert(constantvalue_index_addr != NULL, "invariant"); 1310 assert(is_synthetic_addr != NULL, "invariant"); 1311 assert(generic_signature_index_addr != NULL, "invariant"); 1312 assert(parsed_annotations != NULL, "invariant"); 1313 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1314 1315 u2 constantvalue_index = 0; 1316 u2 generic_signature_index = 0; 1317 bool is_synthetic = false; 1318 const u1* runtime_visible_annotations = NULL; 1319 int runtime_visible_annotations_length = 0; 1320 const u1* runtime_invisible_annotations = NULL; 1321 int runtime_invisible_annotations_length = 0; 1322 const u1* runtime_visible_type_annotations = NULL; 1323 int runtime_visible_type_annotations_length = 0; 1324 const u1* runtime_invisible_type_annotations = NULL; 1325 int runtime_invisible_type_annotations_length = 0; 1326 bool runtime_invisible_annotations_exists = false; 1327 bool runtime_invisible_type_annotations_exists = false; 1328 const ConstantPool* const cp = _cp; 1329 1330 while (attributes_count--) { 1331 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1332 const u2 attribute_name_index = cfs->get_u2_fast(); 1333 const u4 attribute_length = cfs->get_u4_fast(); 1334 check_property(valid_symbol_at(attribute_name_index), 1335 "Invalid field attribute index %u in class file %s", 1336 attribute_name_index, 1337 CHECK); 1338 1339 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1340 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1341 // ignore if non-static 1342 if (constantvalue_index != 0) { 1343 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1344 } 1345 check_property( 1346 attribute_length == 2, 1347 "Invalid ConstantValue field attribute length %u in class file %s", 1348 attribute_length, CHECK); 1349 1350 constantvalue_index = cfs->get_u2(CHECK); 1351 if (_need_verify) { 1352 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1353 } 1354 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1355 if (attribute_length != 0) { 1356 classfile_parse_error( 1357 "Invalid Synthetic field attribute length %u in class file %s", 1358 attribute_length, CHECK); 1359 } 1360 is_synthetic = true; 1361 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1362 if (attribute_length != 0) { 1363 classfile_parse_error( 1364 "Invalid Deprecated field attribute length %u in class file %s", 1365 attribute_length, CHECK); 1366 } 1367 } else if (_major_version >= JAVA_1_5_VERSION) { 1368 if (attribute_name == vmSymbols::tag_signature()) { 1369 if (generic_signature_index != 0) { 1370 classfile_parse_error( 1371 "Multiple Signature attributes for field in class file %s", CHECK); 1372 } 1373 if (attribute_length != 2) { 1374 classfile_parse_error( 1375 "Wrong size %u for field's Signature attribute in class file %s", 1376 attribute_length, CHECK); 1377 } 1378 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1379 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1380 if (runtime_visible_annotations != NULL) { 1381 classfile_parse_error( 1382 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1383 } 1384 runtime_visible_annotations_length = attribute_length; 1385 runtime_visible_annotations = cfs->current(); 1386 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1387 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1388 parse_annotations(cp, 1389 runtime_visible_annotations, 1390 runtime_visible_annotations_length, 1391 parsed_annotations, 1392 _loader_data, 1393 CHECK); 1394 cfs->skip_u1_fast(runtime_visible_annotations_length); 1395 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1396 if (runtime_invisible_annotations_exists) { 1397 classfile_parse_error( 1398 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1399 } 1400 runtime_invisible_annotations_exists = true; 1401 if (PreserveAllAnnotations) { 1402 runtime_invisible_annotations_length = attribute_length; 1403 runtime_invisible_annotations = cfs->current(); 1404 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1405 } 1406 cfs->skip_u1(attribute_length, CHECK); 1407 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1408 if (runtime_visible_type_annotations != NULL) { 1409 classfile_parse_error( 1410 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1411 } 1412 runtime_visible_type_annotations_length = attribute_length; 1413 runtime_visible_type_annotations = cfs->current(); 1414 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1415 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1416 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1417 if (runtime_invisible_type_annotations_exists) { 1418 classfile_parse_error( 1419 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1420 } else { 1421 runtime_invisible_type_annotations_exists = true; 1422 } 1423 if (PreserveAllAnnotations) { 1424 runtime_invisible_type_annotations_length = attribute_length; 1425 runtime_invisible_type_annotations = cfs->current(); 1426 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1427 } 1428 cfs->skip_u1(attribute_length, CHECK); 1429 } else { 1430 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1431 } 1432 } else { 1433 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1434 } 1435 } 1436 1437 *constantvalue_index_addr = constantvalue_index; 1438 *is_synthetic_addr = is_synthetic; 1439 *generic_signature_index_addr = generic_signature_index; 1440 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1441 runtime_visible_annotations_length, 1442 runtime_invisible_annotations, 1443 runtime_invisible_annotations_length, 1444 CHECK); 1445 parsed_annotations->set_field_annotations(a); 1446 a = assemble_annotations(runtime_visible_type_annotations, 1447 runtime_visible_type_annotations_length, 1448 runtime_invisible_type_annotations, 1449 runtime_invisible_type_annotations_length, 1450 CHECK); 1451 parsed_annotations->set_field_type_annotations(a); 1452 return; 1453 } 1454 1455 1456 // Field allocation types. Used for computing field offsets. 1457 1458 enum FieldAllocationType { 1459 STATIC_OOP, // Oops 1460 STATIC_BYTE, // Boolean, Byte, char 1461 STATIC_SHORT, // shorts 1462 STATIC_WORD, // ints 1463 STATIC_DOUBLE, // aligned long or double 1464 NONSTATIC_OOP, 1465 NONSTATIC_BYTE, 1466 NONSTATIC_SHORT, 1467 NONSTATIC_WORD, 1468 NONSTATIC_DOUBLE, 1469 MAX_FIELD_ALLOCATION_TYPE, 1470 BAD_ALLOCATION_TYPE = -1 1471 }; 1472 1473 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1474 BAD_ALLOCATION_TYPE, // 0 1475 BAD_ALLOCATION_TYPE, // 1 1476 BAD_ALLOCATION_TYPE, // 2 1477 BAD_ALLOCATION_TYPE, // 3 1478 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1479 NONSTATIC_SHORT, // T_CHAR = 5, 1480 NONSTATIC_WORD, // T_FLOAT = 6, 1481 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1482 NONSTATIC_BYTE, // T_BYTE = 8, 1483 NONSTATIC_SHORT, // T_SHORT = 9, 1484 NONSTATIC_WORD, // T_INT = 10, 1485 NONSTATIC_DOUBLE, // T_LONG = 11, 1486 NONSTATIC_OOP, // T_OBJECT = 12, 1487 NONSTATIC_OOP, // T_ARRAY = 13, 1488 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1489 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1490 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1491 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1492 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1493 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1494 BAD_ALLOCATION_TYPE, // 0 1495 BAD_ALLOCATION_TYPE, // 1 1496 BAD_ALLOCATION_TYPE, // 2 1497 BAD_ALLOCATION_TYPE, // 3 1498 STATIC_BYTE , // T_BOOLEAN = 4, 1499 STATIC_SHORT, // T_CHAR = 5, 1500 STATIC_WORD, // T_FLOAT = 6, 1501 STATIC_DOUBLE, // T_DOUBLE = 7, 1502 STATIC_BYTE, // T_BYTE = 8, 1503 STATIC_SHORT, // T_SHORT = 9, 1504 STATIC_WORD, // T_INT = 10, 1505 STATIC_DOUBLE, // T_LONG = 11, 1506 STATIC_OOP, // T_OBJECT = 12, 1507 STATIC_OOP, // T_ARRAY = 13, 1508 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1509 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1510 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1511 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1512 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1513 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1514 }; 1515 1516 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1517 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1518 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1519 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1520 return result; 1521 } 1522 1523 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1524 public: 1525 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1526 1527 FieldAllocationCount() { 1528 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1529 count[i] = 0; 1530 } 1531 } 1532 1533 FieldAllocationType update(bool is_static, BasicType type) { 1534 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1535 if (atype != BAD_ALLOCATION_TYPE) { 1536 // Make sure there is no overflow with injected fields. 1537 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1538 count[atype]++; 1539 } 1540 return atype; 1541 } 1542 }; 1543 1544 // Side-effects: populates the _fields, _fields_annotations, 1545 // _fields_type_annotations fields 1546 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1547 bool is_interface, 1548 FieldAllocationCount* const fac, 1549 ConstantPool* cp, 1550 const int cp_size, 1551 u2* const java_fields_count_ptr, 1552 TRAPS) { 1553 1554 assert(cfs != NULL, "invariant"); 1555 assert(fac != NULL, "invariant"); 1556 assert(cp != NULL, "invariant"); 1557 assert(java_fields_count_ptr != NULL, "invariant"); 1558 1559 assert(NULL == _fields, "invariant"); 1560 assert(NULL == _fields_annotations, "invariant"); 1561 assert(NULL == _fields_type_annotations, "invariant"); 1562 1563 cfs->guarantee_more(2, CHECK); // length 1564 const u2 length = cfs->get_u2_fast(); 1565 *java_fields_count_ptr = length; 1566 1567 int num_injected = 0; 1568 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1569 &num_injected); 1570 const int total_fields = length + num_injected; 1571 1572 // The field array starts with tuples of shorts 1573 // [access, name index, sig index, initial value index, byte offset]. 1574 // A generic signature slot only exists for field with generic 1575 // signature attribute. And the access flag is set with 1576 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1577 // signature slots are at the end of the field array and after all 1578 // other fields data. 1579 // 1580 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1581 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1582 // ... 1583 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1584 // [generic signature index] 1585 // [generic signature index] 1586 // ... 1587 // 1588 // Allocate a temporary resource array for field data. For each field, 1589 // a slot is reserved in the temporary array for the generic signature 1590 // index. After parsing all fields, the data are copied to a permanent 1591 // array and any unused slots will be discarded. 1592 ResourceMark rm(THREAD); 1593 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1594 u2, 1595 total_fields * (FieldInfo::field_slots + 1)); 1596 1597 // The generic signature slots start after all other fields' data. 1598 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1599 int num_generic_signature = 0; 1600 for (int n = 0; n < length; n++) { 1601 // access_flags, name_index, descriptor_index, attributes_count 1602 cfs->guarantee_more(8, CHECK); 1603 1604 AccessFlags access_flags; 1605 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1606 verify_legal_field_modifiers(flags, is_interface, CHECK); 1607 access_flags.set_flags(flags); 1608 1609 const u2 name_index = cfs->get_u2_fast(); 1610 check_property(valid_symbol_at(name_index), 1611 "Invalid constant pool index %u for field name in class file %s", 1612 name_index, CHECK); 1613 const Symbol* const name = cp->symbol_at(name_index); 1614 verify_legal_field_name(name, CHECK); 1615 1616 const u2 signature_index = cfs->get_u2_fast(); 1617 check_property(valid_symbol_at(signature_index), 1618 "Invalid constant pool index %u for field signature in class file %s", 1619 signature_index, CHECK); 1620 const Symbol* const sig = cp->symbol_at(signature_index); 1621 verify_legal_field_signature(name, sig, CHECK); 1622 1623 u2 constantvalue_index = 0; 1624 bool is_synthetic = false; 1625 u2 generic_signature_index = 0; 1626 const bool is_static = access_flags.is_static(); 1627 FieldAnnotationCollector parsed_annotations(_loader_data); 1628 1629 const u2 attributes_count = cfs->get_u2_fast(); 1630 if (attributes_count > 0) { 1631 parse_field_attributes(cfs, 1632 attributes_count, 1633 is_static, 1634 signature_index, 1635 &constantvalue_index, 1636 &is_synthetic, 1637 &generic_signature_index, 1638 &parsed_annotations, 1639 CHECK); 1640 1641 if (parsed_annotations.field_annotations() != NULL) { 1642 if (_fields_annotations == NULL) { 1643 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1644 _loader_data, length, NULL, 1645 CHECK); 1646 } 1647 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1648 parsed_annotations.set_field_annotations(NULL); 1649 } 1650 if (parsed_annotations.field_type_annotations() != NULL) { 1651 if (_fields_type_annotations == NULL) { 1652 _fields_type_annotations = 1653 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1654 length, 1655 NULL, 1656 CHECK); 1657 } 1658 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1659 parsed_annotations.set_field_type_annotations(NULL); 1660 } 1661 1662 if (is_synthetic) { 1663 access_flags.set_is_synthetic(); 1664 } 1665 if (generic_signature_index != 0) { 1666 access_flags.set_field_has_generic_signature(); 1667 fa[generic_signature_slot] = generic_signature_index; 1668 generic_signature_slot ++; 1669 num_generic_signature ++; 1670 } 1671 } 1672 1673 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1674 field->initialize(access_flags.as_short(), 1675 name_index, 1676 signature_index, 1677 constantvalue_index); 1678 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1679 1680 // Remember how many oops we encountered and compute allocation type 1681 const FieldAllocationType atype = fac->update(is_static, type); 1682 field->set_allocation_type(atype); 1683 1684 // After field is initialized with type, we can augment it with aux info 1685 if (parsed_annotations.has_any_annotations()) 1686 parsed_annotations.apply_to(field); 1687 } 1688 1689 int index = length; 1690 if (num_injected != 0) { 1691 for (int n = 0; n < num_injected; n++) { 1692 // Check for duplicates 1693 if (injected[n].may_be_java) { 1694 const Symbol* const name = injected[n].name(); 1695 const Symbol* const signature = injected[n].signature(); 1696 bool duplicate = false; 1697 for (int i = 0; i < length; i++) { 1698 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1699 if (name == cp->symbol_at(f->name_index()) && 1700 signature == cp->symbol_at(f->signature_index())) { 1701 // Symbol is desclared in Java so skip this one 1702 duplicate = true; 1703 break; 1704 } 1705 } 1706 if (duplicate) { 1707 // These will be removed from the field array at the end 1708 continue; 1709 } 1710 } 1711 1712 // Injected field 1713 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1714 field->initialize(JVM_ACC_FIELD_INTERNAL, 1715 injected[n].name_index, 1716 injected[n].signature_index, 1717 0); 1718 1719 const BasicType type = FieldType::basic_type(injected[n].signature()); 1720 1721 // Remember how many oops we encountered and compute allocation type 1722 const FieldAllocationType atype = fac->update(false, type); 1723 field->set_allocation_type(atype); 1724 index++; 1725 } 1726 } 1727 1728 assert(NULL == _fields, "invariant"); 1729 1730 _fields = 1731 MetadataFactory::new_array<u2>(_loader_data, 1732 index * FieldInfo::field_slots + num_generic_signature, 1733 CHECK); 1734 // Sometimes injected fields already exist in the Java source so 1735 // the fields array could be too long. In that case the 1736 // fields array is trimed. Also unused slots that were reserved 1737 // for generic signature indexes are discarded. 1738 { 1739 int i = 0; 1740 for (; i < index * FieldInfo::field_slots; i++) { 1741 _fields->at_put(i, fa[i]); 1742 } 1743 for (int j = total_fields * FieldInfo::field_slots; 1744 j < generic_signature_slot; j++) { 1745 _fields->at_put(i++, fa[j]); 1746 } 1747 assert(_fields->length() == i, ""); 1748 } 1749 1750 if (_need_verify && length > 1) { 1751 // Check duplicated fields 1752 ResourceMark rm(THREAD); 1753 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1754 THREAD, NameSigHash*, HASH_ROW_SIZE); 1755 initialize_hashtable(names_and_sigs); 1756 bool dup = false; 1757 const Symbol* name = NULL; 1758 const Symbol* sig = NULL; 1759 { 1760 debug_only(NoSafepointVerifier nsv;) 1761 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1762 name = fs.name(); 1763 sig = fs.signature(); 1764 // If no duplicates, add name/signature in hashtable names_and_sigs. 1765 if (!put_after_lookup(name, sig, names_and_sigs)) { 1766 dup = true; 1767 break; 1768 } 1769 } 1770 } 1771 if (dup) { 1772 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1773 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1774 } 1775 } 1776 } 1777 1778 1779 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1780 u4 code_length, 1781 u4 exception_table_length, 1782 TRAPS) { 1783 assert(cfs != NULL, "invariant"); 1784 1785 const unsafe_u2* const exception_table_start = cfs->current(); 1786 assert(exception_table_start != NULL, "null exception table"); 1787 1788 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1789 // end_pc, 1790 // handler_pc, 1791 // catch_type_index 1792 1793 // Will check legal target after parsing code array in verifier. 1794 if (_need_verify) { 1795 for (unsigned int i = 0; i < exception_table_length; i++) { 1796 const u2 start_pc = cfs->get_u2_fast(); 1797 const u2 end_pc = cfs->get_u2_fast(); 1798 const u2 handler_pc = cfs->get_u2_fast(); 1799 const u2 catch_type_index = cfs->get_u2_fast(); 1800 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1801 "Illegal exception table range in class file %s", 1802 CHECK_NULL); 1803 guarantee_property(handler_pc < code_length, 1804 "Illegal exception table handler in class file %s", 1805 CHECK_NULL); 1806 if (catch_type_index != 0) { 1807 guarantee_property(valid_klass_reference_at(catch_type_index), 1808 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1809 } 1810 } 1811 } else { 1812 cfs->skip_u2_fast(exception_table_length * 4); 1813 } 1814 return exception_table_start; 1815 } 1816 1817 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1818 u4 code_length, 1819 CompressedLineNumberWriteStream**const write_stream, 1820 TRAPS) { 1821 1822 const ClassFileStream* const cfs = _stream; 1823 unsigned int num_entries = cfs->get_u2(CHECK); 1824 1825 // Each entry is a u2 start_pc, and a u2 line_number 1826 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1827 1828 // Verify line number attribute and table length 1829 check_property( 1830 code_attribute_length == sizeof(u2) + length_in_bytes, 1831 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1832 1833 cfs->guarantee_more(length_in_bytes, CHECK); 1834 1835 if ((*write_stream) == NULL) { 1836 if (length_in_bytes > fixed_buffer_size) { 1837 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1838 } else { 1839 (*write_stream) = new CompressedLineNumberWriteStream( 1840 _linenumbertable_buffer, fixed_buffer_size); 1841 } 1842 } 1843 1844 while (num_entries-- > 0) { 1845 const u2 bci = cfs->get_u2_fast(); // start_pc 1846 const u2 line = cfs->get_u2_fast(); // line_number 1847 guarantee_property(bci < code_length, 1848 "Invalid pc in LineNumberTable in class file %s", CHECK); 1849 (*write_stream)->write_pair(bci, line); 1850 } 1851 } 1852 1853 1854 class LVT_Hash : public AllStatic { 1855 public: 1856 1857 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1858 /* 1859 * 3-tuple start_bci/length/slot has to be unique key, 1860 * so the following comparison seems to be redundant: 1861 * && elem->name_cp_index == entry->_elem->name_cp_index 1862 */ 1863 return (e0.start_bci == e1.start_bci && 1864 e0.length == e1.length && 1865 e0.name_cp_index == e1.name_cp_index && 1866 e0.slot == e1.slot); 1867 } 1868 1869 static unsigned int hash(LocalVariableTableElement const& e0) { 1870 unsigned int raw_hash = e0.start_bci; 1871 1872 raw_hash = e0.length + raw_hash * 37; 1873 raw_hash = e0.name_cp_index + raw_hash * 37; 1874 raw_hash = e0.slot + raw_hash * 37; 1875 1876 return raw_hash; 1877 } 1878 }; 1879 1880 1881 // Class file LocalVariableTable elements. 1882 class Classfile_LVT_Element { 1883 public: 1884 u2 start_bci; 1885 u2 length; 1886 u2 name_cp_index; 1887 u2 descriptor_cp_index; 1888 u2 slot; 1889 }; 1890 1891 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1892 LocalVariableTableElement* const lvt) { 1893 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1894 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1895 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1896 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1897 lvt->signature_cp_index = 0; 1898 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1899 } 1900 1901 // Function is used to parse both attributes: 1902 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1903 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1904 u4 code_length, 1905 u2 max_locals, 1906 u4 code_attribute_length, 1907 u2* const localvariable_table_length, 1908 bool isLVTT, 1909 TRAPS) { 1910 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1911 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1912 const unsigned int size = 1913 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1914 1915 const ConstantPool* const cp = _cp; 1916 1917 // Verify local variable table attribute has right length 1918 if (_need_verify) { 1919 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1920 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1921 } 1922 1923 const unsafe_u2* const localvariable_table_start = cfs->current(); 1924 assert(localvariable_table_start != NULL, "null local variable table"); 1925 if (!_need_verify) { 1926 cfs->skip_u2_fast(size); 1927 } else { 1928 cfs->guarantee_more(size * 2, CHECK_NULL); 1929 for(int i = 0; i < (*localvariable_table_length); i++) { 1930 const u2 start_pc = cfs->get_u2_fast(); 1931 const u2 length = cfs->get_u2_fast(); 1932 const u2 name_index = cfs->get_u2_fast(); 1933 const u2 descriptor_index = cfs->get_u2_fast(); 1934 const u2 index = cfs->get_u2_fast(); 1935 // Assign to a u4 to avoid overflow 1936 const u4 end_pc = (u4)start_pc + (u4)length; 1937 1938 if (start_pc >= code_length) { 1939 classfile_parse_error( 1940 "Invalid start_pc %u in %s in class file %s", 1941 start_pc, tbl_name, CHECK_NULL); 1942 } 1943 if (end_pc > code_length) { 1944 classfile_parse_error( 1945 "Invalid length %u in %s in class file %s", 1946 length, tbl_name, CHECK_NULL); 1947 } 1948 const int cp_size = cp->length(); 1949 guarantee_property(valid_symbol_at(name_index), 1950 "Name index %u in %s has bad constant type in class file %s", 1951 name_index, tbl_name, CHECK_NULL); 1952 guarantee_property(valid_symbol_at(descriptor_index), 1953 "Signature index %u in %s has bad constant type in class file %s", 1954 descriptor_index, tbl_name, CHECK_NULL); 1955 1956 const Symbol* const name = cp->symbol_at(name_index); 1957 const Symbol* const sig = cp->symbol_at(descriptor_index); 1958 verify_legal_field_name(name, CHECK_NULL); 1959 u2 extra_slot = 0; 1960 if (!isLVTT) { 1961 verify_legal_field_signature(name, sig, CHECK_NULL); 1962 1963 // 4894874: check special cases for double and long local variables 1964 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1965 sig == vmSymbols::type_signature(T_LONG)) { 1966 extra_slot = 1; 1967 } 1968 } 1969 guarantee_property((index + extra_slot) < max_locals, 1970 "Invalid index %u in %s in class file %s", 1971 index, tbl_name, CHECK_NULL); 1972 } 1973 } 1974 return localvariable_table_start; 1975 } 1976 1977 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1978 u4 code_attribute_length, 1979 bool need_verify, 1980 TRAPS) { 1981 assert(cfs != NULL, "invariant"); 1982 1983 if (0 == code_attribute_length) { 1984 return NULL; 1985 } 1986 1987 const u1* const stackmap_table_start = cfs->current(); 1988 assert(stackmap_table_start != NULL, "null stackmap table"); 1989 1990 // check code_attribute_length first 1991 cfs->skip_u1(code_attribute_length, CHECK_NULL); 1992 1993 if (!need_verify && !DumpSharedSpaces) { 1994 return NULL; 1995 } 1996 return stackmap_table_start; 1997 } 1998 1999 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2000 u2* const checked_exceptions_length, 2001 u4 method_attribute_length, 2002 TRAPS) { 2003 assert(cfs != NULL, "invariant"); 2004 assert(checked_exceptions_length != NULL, "invariant"); 2005 2006 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2007 *checked_exceptions_length = cfs->get_u2_fast(); 2008 const unsigned int size = 2009 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2010 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2011 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2012 if (!_need_verify) { 2013 cfs->skip_u2_fast(size); 2014 } else { 2015 // Verify each value in the checked exception table 2016 u2 checked_exception; 2017 const u2 len = *checked_exceptions_length; 2018 cfs->guarantee_more(2 * len, CHECK_NULL); 2019 for (int i = 0; i < len; i++) { 2020 checked_exception = cfs->get_u2_fast(); 2021 check_property( 2022 valid_klass_reference_at(checked_exception), 2023 "Exception name has bad type at constant pool %u in class file %s", 2024 checked_exception, CHECK_NULL); 2025 } 2026 } 2027 // check exceptions attribute length 2028 if (_need_verify) { 2029 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2030 sizeof(u2) * size), 2031 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2032 } 2033 return checked_exceptions_start; 2034 } 2035 2036 void ClassFileParser::throwIllegalSignature(const char* type, 2037 const Symbol* name, 2038 const Symbol* sig, 2039 TRAPS) const { 2040 assert(name != NULL, "invariant"); 2041 assert(sig != NULL, "invariant"); 2042 2043 ResourceMark rm(THREAD); 2044 Exceptions::fthrow(THREAD_AND_LOCATION, 2045 vmSymbols::java_lang_ClassFormatError(), 2046 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2047 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2048 } 2049 2050 AnnotationCollector::ID 2051 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2052 const Symbol* name) { 2053 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2054 // Privileged code can use all annotations. Other code silently drops some. 2055 const bool privileged = loader_data->is_the_null_class_loader_data() || 2056 loader_data->is_platform_class_loader_data() || 2057 loader_data->is_unsafe_anonymous(); 2058 switch (sid) { 2059 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2060 if (_location != _in_method) break; // only allow for methods 2061 if (!privileged) break; // only allow in privileged code 2062 return _method_CallerSensitive; 2063 } 2064 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2065 if (_location != _in_method) break; // only allow for methods 2066 if (!privileged) break; // only allow in privileged code 2067 return _method_ForceInline; 2068 } 2069 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2070 if (_location != _in_method) break; // only allow for methods 2071 if (!privileged) break; // only allow in privileged code 2072 return _method_DontInline; 2073 } 2074 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2075 if (_location != _in_method) break; // only allow for methods 2076 if (!privileged) break; // only allow in privileged code 2077 return _method_InjectedProfile; 2078 } 2079 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2080 if (_location != _in_method) break; // only allow for methods 2081 if (!privileged) break; // only allow in privileged code 2082 return _method_LambdaForm_Compiled; 2083 } 2084 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 2085 if (_location != _in_method) break; // only allow for methods 2086 if (!privileged) break; // only allow in privileged code 2087 return _method_Hidden; 2088 } 2089 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2090 if (_location != _in_method) break; // only allow for methods 2091 if (!privileged) break; // only allow in privileged code 2092 return _method_HotSpotIntrinsicCandidate; 2093 } 2094 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2095 if (_location != _in_field) break; // only allow for fields 2096 if (!privileged) break; // only allow in privileged code 2097 return _field_Stable; 2098 } 2099 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2100 if (_location != _in_field && _location != _in_class) { 2101 break; // only allow for fields and classes 2102 } 2103 if (!EnableContended || (RestrictContended && !privileged)) { 2104 break; // honor privileges 2105 } 2106 return _jdk_internal_vm_annotation_Contended; 2107 } 2108 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2109 if (_location != _in_method) break; // only allow for methods 2110 if (RestrictReservedStack && !privileged) break; // honor privileges 2111 return _jdk_internal_vm_annotation_ReservedStackAccess; 2112 } 2113 default: { 2114 break; 2115 } 2116 } 2117 return AnnotationCollector::_unknown; 2118 } 2119 2120 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2121 if (is_contended()) 2122 f->set_contended_group(contended_group()); 2123 if (is_stable()) 2124 f->set_stable(true); 2125 } 2126 2127 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2128 // If there's an error deallocate metadata for field annotations 2129 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2130 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2131 } 2132 2133 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2134 if (has_annotation(_method_CallerSensitive)) 2135 m->set_caller_sensitive(true); 2136 if (has_annotation(_method_ForceInline)) 2137 m->set_force_inline(true); 2138 if (has_annotation(_method_DontInline)) 2139 m->set_dont_inline(true); 2140 if (has_annotation(_method_InjectedProfile)) 2141 m->set_has_injected_profile(true); 2142 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2143 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2144 if (has_annotation(_method_Hidden)) 2145 m->set_hidden(true); 2146 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2147 m->set_intrinsic_candidate(true); 2148 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2149 m->set_has_reserved_stack_access(true); 2150 } 2151 2152 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2153 assert(ik != NULL, "invariant"); 2154 ik->set_is_contended(is_contended()); 2155 } 2156 2157 #define MAX_ARGS_SIZE 255 2158 #define MAX_CODE_SIZE 65535 2159 #define INITIAL_MAX_LVT_NUMBER 256 2160 2161 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2162 * 2163 * Rules for LVT's and LVTT's are: 2164 * - There can be any number of LVT's and LVTT's. 2165 * - If there are n LVT's, it is the same as if there was just 2166 * one LVT containing all the entries from the n LVT's. 2167 * - There may be no more than one LVT entry per local variable. 2168 * Two LVT entries are 'equal' if these fields are the same: 2169 * start_pc, length, name, slot 2170 * - There may be no more than one LVTT entry per each LVT entry. 2171 * Each LVTT entry has to match some LVT entry. 2172 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2173 */ 2174 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2175 int lvt_cnt, 2176 u2* const localvariable_table_length, 2177 const unsafe_u2** const localvariable_table_start, 2178 int lvtt_cnt, 2179 u2* const localvariable_type_table_length, 2180 const unsafe_u2** const localvariable_type_table_start, 2181 TRAPS) { 2182 2183 ResourceMark rm(THREAD); 2184 2185 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2186 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2187 2188 LVT_HashTable* const table = new LVT_HashTable(); 2189 2190 // To fill LocalVariableTable in 2191 const Classfile_LVT_Element* cf_lvt; 2192 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2193 2194 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2195 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2196 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2197 copy_lvt_element(&cf_lvt[idx], lvt); 2198 // If no duplicates, add LVT elem in hashtable. 2199 if (table->put(*lvt, lvt) == false 2200 && _need_verify 2201 && _major_version >= JAVA_1_5_VERSION) { 2202 classfile_parse_error("Duplicated LocalVariableTable attribute " 2203 "entry for '%s' in class file %s", 2204 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2205 CHECK); 2206 } 2207 } 2208 } 2209 2210 // To merge LocalVariableTable and LocalVariableTypeTable 2211 const Classfile_LVT_Element* cf_lvtt; 2212 LocalVariableTableElement lvtt_elem; 2213 2214 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2215 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2216 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2217 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2218 LocalVariableTableElement** entry = table->get(lvtt_elem); 2219 if (entry == NULL) { 2220 if (_need_verify) { 2221 classfile_parse_error("LVTT entry for '%s' in class file %s " 2222 "does not match any LVT entry", 2223 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2224 CHECK); 2225 } 2226 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2227 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2228 "entry for '%s' in class file %s", 2229 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2230 CHECK); 2231 } else { 2232 // to add generic signatures into LocalVariableTable 2233 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2234 } 2235 } 2236 } 2237 } 2238 2239 2240 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2241 const u1* runtime_visible_annotations, 2242 int runtime_visible_annotations_length, 2243 const u1* runtime_invisible_annotations, 2244 int runtime_invisible_annotations_length, 2245 const u1* runtime_visible_parameter_annotations, 2246 int runtime_visible_parameter_annotations_length, 2247 const u1* runtime_invisible_parameter_annotations, 2248 int runtime_invisible_parameter_annotations_length, 2249 const u1* runtime_visible_type_annotations, 2250 int runtime_visible_type_annotations_length, 2251 const u1* runtime_invisible_type_annotations, 2252 int runtime_invisible_type_annotations_length, 2253 const u1* annotation_default, 2254 int annotation_default_length, 2255 TRAPS) { 2256 2257 AnnotationArray* a; 2258 2259 if (runtime_visible_annotations_length + 2260 runtime_invisible_annotations_length > 0) { 2261 a = assemble_annotations(runtime_visible_annotations, 2262 runtime_visible_annotations_length, 2263 runtime_invisible_annotations, 2264 runtime_invisible_annotations_length, 2265 CHECK); 2266 cm->set_method_annotations(a); 2267 } 2268 2269 if (runtime_visible_parameter_annotations_length + 2270 runtime_invisible_parameter_annotations_length > 0) { 2271 a = assemble_annotations(runtime_visible_parameter_annotations, 2272 runtime_visible_parameter_annotations_length, 2273 runtime_invisible_parameter_annotations, 2274 runtime_invisible_parameter_annotations_length, 2275 CHECK); 2276 cm->set_parameter_annotations(a); 2277 } 2278 2279 if (annotation_default_length > 0) { 2280 a = assemble_annotations(annotation_default, 2281 annotation_default_length, 2282 NULL, 2283 0, 2284 CHECK); 2285 cm->set_default_annotations(a); 2286 } 2287 2288 if (runtime_visible_type_annotations_length + 2289 runtime_invisible_type_annotations_length > 0) { 2290 a = assemble_annotations(runtime_visible_type_annotations, 2291 runtime_visible_type_annotations_length, 2292 runtime_invisible_type_annotations, 2293 runtime_invisible_type_annotations_length, 2294 CHECK); 2295 cm->set_type_annotations(a); 2296 } 2297 } 2298 2299 2300 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2301 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2302 // Method* to save footprint, so we only know the size of the resulting Method* when the 2303 // entire method attribute is parsed. 2304 // 2305 // The promoted_flags parameter is used to pass relevant access_flags 2306 // from the method back up to the containing klass. These flag values 2307 // are added to klass's access_flags. 2308 2309 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2310 bool is_interface, 2311 const ConstantPool* cp, 2312 AccessFlags* const promoted_flags, 2313 TRAPS) { 2314 assert(cfs != NULL, "invariant"); 2315 assert(cp != NULL, "invariant"); 2316 assert(promoted_flags != NULL, "invariant"); 2317 2318 ResourceMark rm(THREAD); 2319 // Parse fixed parts: 2320 // access_flags, name_index, descriptor_index, attributes_count 2321 cfs->guarantee_more(8, CHECK_NULL); 2322 2323 int flags = cfs->get_u2_fast(); 2324 const u2 name_index = cfs->get_u2_fast(); 2325 const int cp_size = cp->length(); 2326 check_property( 2327 valid_symbol_at(name_index), 2328 "Illegal constant pool index %u for method name in class file %s", 2329 name_index, CHECK_NULL); 2330 const Symbol* const name = cp->symbol_at(name_index); 2331 verify_legal_method_name(name, CHECK_NULL); 2332 2333 const u2 signature_index = cfs->get_u2_fast(); 2334 guarantee_property( 2335 valid_symbol_at(signature_index), 2336 "Illegal constant pool index %u for method signature in class file %s", 2337 signature_index, CHECK_NULL); 2338 const Symbol* const signature = cp->symbol_at(signature_index); 2339 2340 if (name == vmSymbols::class_initializer_name()) { 2341 // We ignore the other access flags for a valid class initializer. 2342 // (JVM Spec 2nd ed., chapter 4.6) 2343 if (_major_version < 51) { // backward compatibility 2344 flags = JVM_ACC_STATIC; 2345 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2346 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2347 } else { 2348 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2349 } 2350 } else { 2351 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2352 } 2353 2354 if (name == vmSymbols::object_initializer_name() && is_interface) { 2355 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2356 } 2357 2358 int args_size = -1; // only used when _need_verify is true 2359 if (_need_verify) { 2360 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2361 verify_legal_method_signature(name, signature, CHECK_NULL); 2362 if (args_size > MAX_ARGS_SIZE) { 2363 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2364 } 2365 } 2366 2367 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2368 2369 // Default values for code and exceptions attribute elements 2370 u2 max_stack = 0; 2371 u2 max_locals = 0; 2372 u4 code_length = 0; 2373 const u1* code_start = 0; 2374 u2 exception_table_length = 0; 2375 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2376 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2377 u2 checked_exceptions_length = 0; 2378 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2379 CompressedLineNumberWriteStream* linenumber_table = NULL; 2380 int linenumber_table_length = 0; 2381 int total_lvt_length = 0; 2382 u2 lvt_cnt = 0; 2383 u2 lvtt_cnt = 0; 2384 bool lvt_allocated = false; 2385 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2386 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2387 u2* localvariable_table_length = NULL; 2388 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2389 u2* localvariable_type_table_length = NULL; 2390 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2391 int method_parameters_length = -1; 2392 const u1* method_parameters_data = NULL; 2393 bool method_parameters_seen = false; 2394 bool parsed_code_attribute = false; 2395 bool parsed_checked_exceptions_attribute = false; 2396 bool parsed_stackmap_attribute = false; 2397 // stackmap attribute - JDK1.5 2398 const u1* stackmap_data = NULL; 2399 int stackmap_data_length = 0; 2400 u2 generic_signature_index = 0; 2401 MethodAnnotationCollector parsed_annotations; 2402 const u1* runtime_visible_annotations = NULL; 2403 int runtime_visible_annotations_length = 0; 2404 const u1* runtime_invisible_annotations = NULL; 2405 int runtime_invisible_annotations_length = 0; 2406 const u1* runtime_visible_parameter_annotations = NULL; 2407 int runtime_visible_parameter_annotations_length = 0; 2408 const u1* runtime_invisible_parameter_annotations = NULL; 2409 int runtime_invisible_parameter_annotations_length = 0; 2410 const u1* runtime_visible_type_annotations = NULL; 2411 int runtime_visible_type_annotations_length = 0; 2412 const u1* runtime_invisible_type_annotations = NULL; 2413 int runtime_invisible_type_annotations_length = 0; 2414 bool runtime_invisible_annotations_exists = false; 2415 bool runtime_invisible_type_annotations_exists = false; 2416 bool runtime_invisible_parameter_annotations_exists = false; 2417 const u1* annotation_default = NULL; 2418 int annotation_default_length = 0; 2419 2420 // Parse code and exceptions attribute 2421 u2 method_attributes_count = cfs->get_u2_fast(); 2422 while (method_attributes_count--) { 2423 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2424 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2425 const u4 method_attribute_length = cfs->get_u4_fast(); 2426 check_property( 2427 valid_symbol_at(method_attribute_name_index), 2428 "Invalid method attribute name index %u in class file %s", 2429 method_attribute_name_index, CHECK_NULL); 2430 2431 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2432 if (method_attribute_name == vmSymbols::tag_code()) { 2433 // Parse Code attribute 2434 if (_need_verify) { 2435 guarantee_property( 2436 !access_flags.is_native() && !access_flags.is_abstract(), 2437 "Code attribute in native or abstract methods in class file %s", 2438 CHECK_NULL); 2439 } 2440 if (parsed_code_attribute) { 2441 classfile_parse_error("Multiple Code attributes in class file %s", 2442 CHECK_NULL); 2443 } 2444 parsed_code_attribute = true; 2445 2446 // Stack size, locals size, and code size 2447 if (_major_version == 45 && _minor_version <= 2) { 2448 cfs->guarantee_more(4, CHECK_NULL); 2449 max_stack = cfs->get_u1_fast(); 2450 max_locals = cfs->get_u1_fast(); 2451 code_length = cfs->get_u2_fast(); 2452 } else { 2453 cfs->guarantee_more(8, CHECK_NULL); 2454 max_stack = cfs->get_u2_fast(); 2455 max_locals = cfs->get_u2_fast(); 2456 code_length = cfs->get_u4_fast(); 2457 } 2458 if (_need_verify) { 2459 guarantee_property(args_size <= max_locals, 2460 "Arguments can't fit into locals in class file %s", 2461 CHECK_NULL); 2462 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2463 "Invalid method Code length %u in class file %s", 2464 code_length, CHECK_NULL); 2465 } 2466 // Code pointer 2467 code_start = cfs->current(); 2468 assert(code_start != NULL, "null code start"); 2469 cfs->guarantee_more(code_length, CHECK_NULL); 2470 cfs->skip_u1_fast(code_length); 2471 2472 // Exception handler table 2473 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2474 exception_table_length = cfs->get_u2_fast(); 2475 if (exception_table_length > 0) { 2476 exception_table_start = parse_exception_table(cfs, 2477 code_length, 2478 exception_table_length, 2479 CHECK_NULL); 2480 } 2481 2482 // Parse additional attributes in code attribute 2483 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2484 u2 code_attributes_count = cfs->get_u2_fast(); 2485 2486 unsigned int calculated_attribute_length = 0; 2487 2488 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2489 calculated_attribute_length = 2490 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2491 } else { 2492 // max_stack, locals and length are smaller in pre-version 45.2 classes 2493 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2494 } 2495 calculated_attribute_length += 2496 code_length + 2497 sizeof(exception_table_length) + 2498 sizeof(code_attributes_count) + 2499 exception_table_length * 2500 ( sizeof(u2) + // start_pc 2501 sizeof(u2) + // end_pc 2502 sizeof(u2) + // handler_pc 2503 sizeof(u2) ); // catch_type_index 2504 2505 while (code_attributes_count--) { 2506 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2507 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2508 const u4 code_attribute_length = cfs->get_u4_fast(); 2509 calculated_attribute_length += code_attribute_length + 2510 sizeof(code_attribute_name_index) + 2511 sizeof(code_attribute_length); 2512 check_property(valid_symbol_at(code_attribute_name_index), 2513 "Invalid code attribute name index %u in class file %s", 2514 code_attribute_name_index, 2515 CHECK_NULL); 2516 if (LoadLineNumberTables && 2517 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2518 // Parse and compress line number table 2519 parse_linenumber_table(code_attribute_length, 2520 code_length, 2521 &linenumber_table, 2522 CHECK_NULL); 2523 2524 } else if (LoadLocalVariableTables && 2525 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2526 // Parse local variable table 2527 if (!lvt_allocated) { 2528 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2529 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2530 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2531 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2532 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2533 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2534 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2535 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2536 lvt_allocated = true; 2537 } 2538 if (lvt_cnt == max_lvt_cnt) { 2539 max_lvt_cnt <<= 1; 2540 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2541 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2542 } 2543 localvariable_table_start[lvt_cnt] = 2544 parse_localvariable_table(cfs, 2545 code_length, 2546 max_locals, 2547 code_attribute_length, 2548 &localvariable_table_length[lvt_cnt], 2549 false, // is not LVTT 2550 CHECK_NULL); 2551 total_lvt_length += localvariable_table_length[lvt_cnt]; 2552 lvt_cnt++; 2553 } else if (LoadLocalVariableTypeTables && 2554 _major_version >= JAVA_1_5_VERSION && 2555 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2556 if (!lvt_allocated) { 2557 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2558 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2559 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2560 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2561 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2562 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2563 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2564 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2565 lvt_allocated = true; 2566 } 2567 // Parse local variable type table 2568 if (lvtt_cnt == max_lvtt_cnt) { 2569 max_lvtt_cnt <<= 1; 2570 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2571 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2572 } 2573 localvariable_type_table_start[lvtt_cnt] = 2574 parse_localvariable_table(cfs, 2575 code_length, 2576 max_locals, 2577 code_attribute_length, 2578 &localvariable_type_table_length[lvtt_cnt], 2579 true, // is LVTT 2580 CHECK_NULL); 2581 lvtt_cnt++; 2582 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2583 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2584 // Stack map is only needed by the new verifier in JDK1.5. 2585 if (parsed_stackmap_attribute) { 2586 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2587 } 2588 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2589 stackmap_data_length = code_attribute_length; 2590 parsed_stackmap_attribute = true; 2591 } else { 2592 // Skip unknown attributes 2593 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2594 } 2595 } 2596 // check method attribute length 2597 if (_need_verify) { 2598 guarantee_property(method_attribute_length == calculated_attribute_length, 2599 "Code segment has wrong length in class file %s", 2600 CHECK_NULL); 2601 } 2602 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2603 // Parse Exceptions attribute 2604 if (parsed_checked_exceptions_attribute) { 2605 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2606 CHECK_NULL); 2607 } 2608 parsed_checked_exceptions_attribute = true; 2609 checked_exceptions_start = 2610 parse_checked_exceptions(cfs, 2611 &checked_exceptions_length, 2612 method_attribute_length, 2613 CHECK_NULL); 2614 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2615 // reject multiple method parameters 2616 if (method_parameters_seen) { 2617 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2618 CHECK_NULL); 2619 } 2620 method_parameters_seen = true; 2621 method_parameters_length = cfs->get_u1_fast(); 2622 const u2 real_length = (method_parameters_length * 4u) + 1u; 2623 if (method_attribute_length != real_length) { 2624 classfile_parse_error( 2625 "Invalid MethodParameters method attribute length %u in class file", 2626 method_attribute_length, CHECK_NULL); 2627 } 2628 method_parameters_data = cfs->current(); 2629 cfs->skip_u2_fast(method_parameters_length); 2630 cfs->skip_u2_fast(method_parameters_length); 2631 // ignore this attribute if it cannot be reflected 2632 if (!SystemDictionary::Parameter_klass_loaded()) 2633 method_parameters_length = -1; 2634 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2635 if (method_attribute_length != 0) { 2636 classfile_parse_error( 2637 "Invalid Synthetic method attribute length %u in class file %s", 2638 method_attribute_length, CHECK_NULL); 2639 } 2640 // Should we check that there hasn't already been a synthetic attribute? 2641 access_flags.set_is_synthetic(); 2642 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2643 if (method_attribute_length != 0) { 2644 classfile_parse_error( 2645 "Invalid Deprecated method attribute length %u in class file %s", 2646 method_attribute_length, CHECK_NULL); 2647 } 2648 } else if (_major_version >= JAVA_1_5_VERSION) { 2649 if (method_attribute_name == vmSymbols::tag_signature()) { 2650 if (generic_signature_index != 0) { 2651 classfile_parse_error( 2652 "Multiple Signature attributes for method in class file %s", 2653 CHECK_NULL); 2654 } 2655 if (method_attribute_length != 2) { 2656 classfile_parse_error( 2657 "Invalid Signature attribute length %u in class file %s", 2658 method_attribute_length, CHECK_NULL); 2659 } 2660 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2661 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2662 if (runtime_visible_annotations != NULL) { 2663 classfile_parse_error( 2664 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2665 CHECK_NULL); 2666 } 2667 runtime_visible_annotations_length = method_attribute_length; 2668 runtime_visible_annotations = cfs->current(); 2669 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2670 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2671 parse_annotations(cp, 2672 runtime_visible_annotations, 2673 runtime_visible_annotations_length, 2674 &parsed_annotations, 2675 _loader_data, 2676 CHECK_NULL); 2677 cfs->skip_u1_fast(runtime_visible_annotations_length); 2678 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2679 if (runtime_invisible_annotations_exists) { 2680 classfile_parse_error( 2681 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2682 CHECK_NULL); 2683 } 2684 runtime_invisible_annotations_exists = true; 2685 if (PreserveAllAnnotations) { 2686 runtime_invisible_annotations_length = method_attribute_length; 2687 runtime_invisible_annotations = cfs->current(); 2688 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2689 } 2690 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2691 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2692 if (runtime_visible_parameter_annotations != NULL) { 2693 classfile_parse_error( 2694 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2695 CHECK_NULL); 2696 } 2697 runtime_visible_parameter_annotations_length = method_attribute_length; 2698 runtime_visible_parameter_annotations = cfs->current(); 2699 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2700 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2701 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2702 if (runtime_invisible_parameter_annotations_exists) { 2703 classfile_parse_error( 2704 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2705 CHECK_NULL); 2706 } 2707 runtime_invisible_parameter_annotations_exists = true; 2708 if (PreserveAllAnnotations) { 2709 runtime_invisible_parameter_annotations_length = method_attribute_length; 2710 runtime_invisible_parameter_annotations = cfs->current(); 2711 assert(runtime_invisible_parameter_annotations != NULL, 2712 "null invisible parameter annotations"); 2713 } 2714 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2715 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2716 if (annotation_default != NULL) { 2717 classfile_parse_error( 2718 "Multiple AnnotationDefault attributes for method in class file %s", 2719 CHECK_NULL); 2720 } 2721 annotation_default_length = method_attribute_length; 2722 annotation_default = cfs->current(); 2723 assert(annotation_default != NULL, "null annotation default"); 2724 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2725 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2726 if (runtime_visible_type_annotations != NULL) { 2727 classfile_parse_error( 2728 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2729 CHECK_NULL); 2730 } 2731 runtime_visible_type_annotations_length = method_attribute_length; 2732 runtime_visible_type_annotations = cfs->current(); 2733 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2734 // No need for the VM to parse Type annotations 2735 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2736 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2737 if (runtime_invisible_type_annotations_exists) { 2738 classfile_parse_error( 2739 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2740 CHECK_NULL); 2741 } else { 2742 runtime_invisible_type_annotations_exists = true; 2743 } 2744 if (PreserveAllAnnotations) { 2745 runtime_invisible_type_annotations_length = method_attribute_length; 2746 runtime_invisible_type_annotations = cfs->current(); 2747 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2748 } 2749 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2750 } else { 2751 // Skip unknown attributes 2752 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2753 } 2754 } else { 2755 // Skip unknown attributes 2756 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2757 } 2758 } 2759 2760 if (linenumber_table != NULL) { 2761 linenumber_table->write_terminator(); 2762 linenumber_table_length = linenumber_table->position(); 2763 } 2764 2765 // Make sure there's at least one Code attribute in non-native/non-abstract method 2766 if (_need_verify) { 2767 guarantee_property(access_flags.is_native() || 2768 access_flags.is_abstract() || 2769 parsed_code_attribute, 2770 "Absent Code attribute in method that is not native or abstract in class file %s", 2771 CHECK_NULL); 2772 } 2773 2774 // All sizing information for a Method* is finally available, now create it 2775 InlineTableSizes sizes( 2776 total_lvt_length, 2777 linenumber_table_length, 2778 exception_table_length, 2779 checked_exceptions_length, 2780 method_parameters_length, 2781 generic_signature_index, 2782 runtime_visible_annotations_length + 2783 runtime_invisible_annotations_length, 2784 runtime_visible_parameter_annotations_length + 2785 runtime_invisible_parameter_annotations_length, 2786 runtime_visible_type_annotations_length + 2787 runtime_invisible_type_annotations_length, 2788 annotation_default_length, 2789 0); 2790 2791 Method* const m = Method::allocate(_loader_data, 2792 code_length, 2793 access_flags, 2794 &sizes, 2795 ConstMethod::NORMAL, 2796 CHECK_NULL); 2797 2798 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2799 2800 // Fill in information from fixed part (access_flags already set) 2801 m->set_constants(_cp); 2802 m->set_name_index(name_index); 2803 m->set_signature_index(signature_index); 2804 2805 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 2806 m->constMethod()->set_result_type(rtf.type()); 2807 2808 if (args_size >= 0) { 2809 m->set_size_of_parameters(args_size); 2810 } else { 2811 m->compute_size_of_parameters(THREAD); 2812 } 2813 #ifdef ASSERT 2814 if (args_size >= 0) { 2815 m->compute_size_of_parameters(THREAD); 2816 assert(args_size == m->size_of_parameters(), ""); 2817 } 2818 #endif 2819 2820 // Fill in code attribute information 2821 m->set_max_stack(max_stack); 2822 m->set_max_locals(max_locals); 2823 if (stackmap_data != NULL) { 2824 m->constMethod()->copy_stackmap_data(_loader_data, 2825 (u1*)stackmap_data, 2826 stackmap_data_length, 2827 CHECK_NULL); 2828 } 2829 2830 // Copy byte codes 2831 m->set_code((u1*)code_start); 2832 2833 // Copy line number table 2834 if (linenumber_table != NULL) { 2835 memcpy(m->compressed_linenumber_table(), 2836 linenumber_table->buffer(), 2837 linenumber_table_length); 2838 } 2839 2840 // Copy exception table 2841 if (exception_table_length > 0) { 2842 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2843 m->exception_table_start(), 2844 exception_table_length * sizeof(ExceptionTableElement), 2845 sizeof(u2)); 2846 } 2847 2848 // Copy method parameters 2849 if (method_parameters_length > 0) { 2850 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2851 for (int i = 0; i < method_parameters_length; i++) { 2852 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2853 method_parameters_data += 2; 2854 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2855 method_parameters_data += 2; 2856 } 2857 } 2858 2859 // Copy checked exceptions 2860 if (checked_exceptions_length > 0) { 2861 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2862 m->checked_exceptions_start(), 2863 checked_exceptions_length * sizeof(CheckedExceptionElement), 2864 sizeof(u2)); 2865 } 2866 2867 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2868 if (total_lvt_length > 0) { 2869 promoted_flags->set_has_localvariable_table(); 2870 copy_localvariable_table(m->constMethod(), 2871 lvt_cnt, 2872 localvariable_table_length, 2873 localvariable_table_start, 2874 lvtt_cnt, 2875 localvariable_type_table_length, 2876 localvariable_type_table_start, 2877 CHECK_NULL); 2878 } 2879 2880 if (parsed_annotations.has_any_annotations()) 2881 parsed_annotations.apply_to(m); 2882 2883 // Copy annotations 2884 copy_method_annotations(m->constMethod(), 2885 runtime_visible_annotations, 2886 runtime_visible_annotations_length, 2887 runtime_invisible_annotations, 2888 runtime_invisible_annotations_length, 2889 runtime_visible_parameter_annotations, 2890 runtime_visible_parameter_annotations_length, 2891 runtime_invisible_parameter_annotations, 2892 runtime_invisible_parameter_annotations_length, 2893 runtime_visible_type_annotations, 2894 runtime_visible_type_annotations_length, 2895 runtime_invisible_type_annotations, 2896 runtime_invisible_type_annotations_length, 2897 annotation_default, 2898 annotation_default_length, 2899 CHECK_NULL); 2900 2901 if (name == vmSymbols::finalize_method_name() && 2902 signature == vmSymbols::void_method_signature()) { 2903 if (m->is_empty_method()) { 2904 _has_empty_finalizer = true; 2905 } else { 2906 _has_finalizer = true; 2907 } 2908 } 2909 if (name == vmSymbols::object_initializer_name() && 2910 signature == vmSymbols::void_method_signature() && 2911 m->is_vanilla_constructor()) { 2912 _has_vanilla_constructor = true; 2913 } 2914 2915 NOT_PRODUCT(m->verify()); 2916 return m; 2917 } 2918 2919 2920 // The promoted_flags parameter is used to pass relevant access_flags 2921 // from the methods back up to the containing klass. These flag values 2922 // are added to klass's access_flags. 2923 // Side-effects: populates the _methods field in the parser 2924 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2925 bool is_interface, 2926 AccessFlags* promoted_flags, 2927 bool* has_final_method, 2928 bool* declares_nonstatic_concrete_methods, 2929 TRAPS) { 2930 assert(cfs != NULL, "invariant"); 2931 assert(promoted_flags != NULL, "invariant"); 2932 assert(has_final_method != NULL, "invariant"); 2933 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 2934 2935 assert(NULL == _methods, "invariant"); 2936 2937 cfs->guarantee_more(2, CHECK); // length 2938 const u2 length = cfs->get_u2_fast(); 2939 if (length == 0) { 2940 _methods = Universe::the_empty_method_array(); 2941 } else { 2942 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2943 length, 2944 NULL, 2945 CHECK); 2946 2947 for (int index = 0; index < length; index++) { 2948 Method* method = parse_method(cfs, 2949 is_interface, 2950 _cp, 2951 promoted_flags, 2952 CHECK); 2953 2954 if (method->is_final()) { 2955 *has_final_method = true; 2956 } 2957 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2958 // used for interface initialization, and default method inheritance analysis 2959 if (is_interface && !(*declares_nonstatic_concrete_methods) 2960 && !method->is_abstract() && !method->is_static()) { 2961 *declares_nonstatic_concrete_methods = true; 2962 } 2963 _methods->at_put(index, method); 2964 } 2965 2966 if (_need_verify && length > 1) { 2967 // Check duplicated methods 2968 ResourceMark rm(THREAD); 2969 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2970 THREAD, NameSigHash*, HASH_ROW_SIZE); 2971 initialize_hashtable(names_and_sigs); 2972 bool dup = false; 2973 const Symbol* name = NULL; 2974 const Symbol* sig = NULL; 2975 { 2976 debug_only(NoSafepointVerifier nsv;) 2977 for (int i = 0; i < length; i++) { 2978 const Method* const m = _methods->at(i); 2979 name = m->name(); 2980 sig = m->signature(); 2981 // If no duplicates, add name/signature in hashtable names_and_sigs. 2982 if (!put_after_lookup(name, sig, names_and_sigs)) { 2983 dup = true; 2984 break; 2985 } 2986 } 2987 } 2988 if (dup) { 2989 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2990 name->as_C_string(), sig->as_klass_external_name(), CHECK); 2991 } 2992 } 2993 } 2994 } 2995 2996 static const intArray* sort_methods(Array<Method*>* methods) { 2997 const int length = methods->length(); 2998 // If JVMTI original method ordering or sharing is enabled we have to 2999 // remember the original class file ordering. 3000 // We temporarily use the vtable_index field in the Method* to store the 3001 // class file index, so we can read in after calling qsort. 3002 // Put the method ordering in the shared archive. 3003 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3004 for (int index = 0; index < length; index++) { 3005 Method* const m = methods->at(index); 3006 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3007 m->set_vtable_index(index); 3008 } 3009 } 3010 // Sort method array by ascending method name (for faster lookups & vtable construction) 3011 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3012 Method::sort_methods(methods); 3013 3014 intArray* method_ordering = NULL; 3015 // If JVMTI original method ordering or sharing is enabled construct int 3016 // array remembering the original ordering 3017 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3018 method_ordering = new intArray(length, length, -1); 3019 for (int index = 0; index < length; index++) { 3020 Method* const m = methods->at(index); 3021 const int old_index = m->vtable_index(); 3022 assert(old_index >= 0 && old_index < length, "invalid method index"); 3023 method_ordering->at_put(index, old_index); 3024 m->set_vtable_index(Method::invalid_vtable_index); 3025 } 3026 } 3027 return method_ordering; 3028 } 3029 3030 // Parse generic_signature attribute for methods and fields 3031 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3032 TRAPS) { 3033 assert(cfs != NULL, "invariant"); 3034 3035 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3036 const u2 generic_signature_index = cfs->get_u2_fast(); 3037 check_property( 3038 valid_symbol_at(generic_signature_index), 3039 "Invalid Signature attribute at constant pool index %u in class file %s", 3040 generic_signature_index, CHECK_0); 3041 return generic_signature_index; 3042 } 3043 3044 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3045 TRAPS) { 3046 3047 assert(cfs != NULL, "invariant"); 3048 3049 cfs->guarantee_more(2, CHECK); // sourcefile_index 3050 const u2 sourcefile_index = cfs->get_u2_fast(); 3051 check_property( 3052 valid_symbol_at(sourcefile_index), 3053 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3054 sourcefile_index, CHECK); 3055 set_class_sourcefile_index(sourcefile_index); 3056 } 3057 3058 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3059 int length, 3060 TRAPS) { 3061 assert(cfs != NULL, "invariant"); 3062 3063 const u1* const sde_buffer = cfs->current(); 3064 assert(sde_buffer != NULL, "null sde buffer"); 3065 3066 // Don't bother storing it if there is no way to retrieve it 3067 if (JvmtiExport::can_get_source_debug_extension()) { 3068 assert((length+1) > length, "Overflow checking"); 3069 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3070 for (int i = 0; i < length; i++) { 3071 sde[i] = sde_buffer[i]; 3072 } 3073 sde[length] = '\0'; 3074 set_class_sde_buffer((const char*)sde, length); 3075 } 3076 // Got utf8 string, set stream position forward 3077 cfs->skip_u1(length, CHECK); 3078 } 3079 3080 3081 // Inner classes can be static, private or protected (classic VM does this) 3082 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3083 JVM_ACC_PRIVATE | \ 3084 JVM_ACC_PROTECTED | \ 3085 JVM_ACC_STATIC \ 3086 ) 3087 3088 // Return number of classes in the inner classes attribute table 3089 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3090 const u1* const inner_classes_attribute_start, 3091 bool parsed_enclosingmethod_attribute, 3092 u2 enclosing_method_class_index, 3093 u2 enclosing_method_method_index, 3094 TRAPS) { 3095 const u1* const current_mark = cfs->current(); 3096 u2 length = 0; 3097 if (inner_classes_attribute_start != NULL) { 3098 cfs->set_current(inner_classes_attribute_start); 3099 cfs->guarantee_more(2, CHECK_0); // length 3100 length = cfs->get_u2_fast(); 3101 } 3102 3103 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3104 // method data: 3105 // [inner_class_info_index, 3106 // outer_class_info_index, 3107 // inner_name_index, 3108 // inner_class_access_flags, 3109 // ... 3110 // enclosing_method_class_index, 3111 // enclosing_method_method_index] 3112 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3113 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3114 _inner_classes = inner_classes; 3115 3116 int index = 0; 3117 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3118 for (int n = 0; n < length; n++) { 3119 // Inner class index 3120 const u2 inner_class_info_index = cfs->get_u2_fast(); 3121 check_property( 3122 valid_klass_reference_at(inner_class_info_index), 3123 "inner_class_info_index %u has bad constant type in class file %s", 3124 inner_class_info_index, CHECK_0); 3125 // Outer class index 3126 const u2 outer_class_info_index = cfs->get_u2_fast(); 3127 check_property( 3128 outer_class_info_index == 0 || 3129 valid_klass_reference_at(outer_class_info_index), 3130 "outer_class_info_index %u has bad constant type in class file %s", 3131 outer_class_info_index, CHECK_0); 3132 // Inner class name 3133 const u2 inner_name_index = cfs->get_u2_fast(); 3134 check_property( 3135 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3136 "inner_name_index %u has bad constant type in class file %s", 3137 inner_name_index, CHECK_0); 3138 if (_need_verify) { 3139 guarantee_property(inner_class_info_index != outer_class_info_index, 3140 "Class is both outer and inner class in class file %s", CHECK_0); 3141 } 3142 // Access flags 3143 jint flags; 3144 // JVM_ACC_MODULE is defined in JDK-9 and later. 3145 if (_major_version >= JAVA_9_VERSION) { 3146 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3147 } else { 3148 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3149 } 3150 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3151 // Set abstract bit for old class files for backward compatibility 3152 flags |= JVM_ACC_ABSTRACT; 3153 } 3154 verify_legal_class_modifiers(flags, CHECK_0); 3155 AccessFlags inner_access_flags(flags); 3156 3157 inner_classes->at_put(index++, inner_class_info_index); 3158 inner_classes->at_put(index++, outer_class_info_index); 3159 inner_classes->at_put(index++, inner_name_index); 3160 inner_classes->at_put(index++, inner_access_flags.as_short()); 3161 } 3162 3163 // 4347400: make sure there's no duplicate entry in the classes array 3164 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3165 for(int i = 0; i < length * 4; i += 4) { 3166 for(int j = i + 4; j < length * 4; j += 4) { 3167 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3168 inner_classes->at(i+1) != inner_classes->at(j+1) || 3169 inner_classes->at(i+2) != inner_classes->at(j+2) || 3170 inner_classes->at(i+3) != inner_classes->at(j+3)), 3171 "Duplicate entry in InnerClasses in class file %s", 3172 CHECK_0); 3173 } 3174 } 3175 } 3176 3177 // Set EnclosingMethod class and method indexes. 3178 if (parsed_enclosingmethod_attribute) { 3179 inner_classes->at_put(index++, enclosing_method_class_index); 3180 inner_classes->at_put(index++, enclosing_method_method_index); 3181 } 3182 assert(index == size, "wrong size"); 3183 3184 // Restore buffer's current position. 3185 cfs->set_current(current_mark); 3186 3187 return length; 3188 } 3189 3190 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3191 const u1* const nest_members_attribute_start, 3192 TRAPS) { 3193 const u1* const current_mark = cfs->current(); 3194 u2 length = 0; 3195 if (nest_members_attribute_start != NULL) { 3196 cfs->set_current(nest_members_attribute_start); 3197 cfs->guarantee_more(2, CHECK_0); // length 3198 length = cfs->get_u2_fast(); 3199 } 3200 const int size = length; 3201 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3202 _nest_members = nest_members; 3203 3204 int index = 0; 3205 cfs->guarantee_more(2 * length, CHECK_0); 3206 for (int n = 0; n < length; n++) { 3207 const u2 class_info_index = cfs->get_u2_fast(); 3208 check_property( 3209 valid_klass_reference_at(class_info_index), 3210 "Nest member class_info_index %u has bad constant type in class file %s", 3211 class_info_index, CHECK_0); 3212 nest_members->at_put(index++, class_info_index); 3213 } 3214 assert(index == size, "wrong size"); 3215 3216 // Restore buffer's current position. 3217 cfs->set_current(current_mark); 3218 3219 return length; 3220 } 3221 3222 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3223 set_class_synthetic_flag(true); 3224 } 3225 3226 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3227 assert(cfs != NULL, "invariant"); 3228 3229 const u2 signature_index = cfs->get_u2(CHECK); 3230 check_property( 3231 valid_symbol_at(signature_index), 3232 "Invalid constant pool index %u in Signature attribute in class file %s", 3233 signature_index, CHECK); 3234 set_class_generic_signature_index(signature_index); 3235 } 3236 3237 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3238 ConstantPool* cp, 3239 u4 attribute_byte_length, 3240 TRAPS) { 3241 assert(cfs != NULL, "invariant"); 3242 assert(cp != NULL, "invariant"); 3243 3244 const u1* const current_start = cfs->current(); 3245 3246 guarantee_property(attribute_byte_length >= sizeof(u2), 3247 "Invalid BootstrapMethods attribute length %u in class file %s", 3248 attribute_byte_length, 3249 CHECK); 3250 3251 cfs->guarantee_more(attribute_byte_length, CHECK); 3252 3253 const int attribute_array_length = cfs->get_u2_fast(); 3254 3255 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3256 "Short length on BootstrapMethods in class file %s", 3257 CHECK); 3258 3259 3260 // The attribute contains a counted array of counted tuples of shorts, 3261 // represending bootstrap specifiers: 3262 // length*{bootstrap_method_index, argument_count*{argument_index}} 3263 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3264 // operand_count = number of shorts in attr, except for leading length 3265 3266 // The attribute is copied into a short[] array. 3267 // The array begins with a series of short[2] pairs, one for each tuple. 3268 const int index_size = (attribute_array_length * 2); 3269 3270 Array<u2>* const operands = 3271 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3272 3273 // Eagerly assign operands so they will be deallocated with the constant 3274 // pool if there is an error. 3275 cp->set_operands(operands); 3276 3277 int operand_fill_index = index_size; 3278 const int cp_size = cp->length(); 3279 3280 for (int n = 0; n < attribute_array_length; n++) { 3281 // Store a 32-bit offset into the header of the operand array. 3282 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3283 3284 // Read a bootstrap specifier. 3285 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3286 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3287 const u2 argument_count = cfs->get_u2_fast(); 3288 check_property( 3289 valid_cp_range(bootstrap_method_index, cp_size) && 3290 cp->tag_at(bootstrap_method_index).is_method_handle(), 3291 "bootstrap_method_index %u has bad constant type in class file %s", 3292 bootstrap_method_index, 3293 CHECK); 3294 3295 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3296 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3297 CHECK); 3298 3299 operands->at_put(operand_fill_index++, bootstrap_method_index); 3300 operands->at_put(operand_fill_index++, argument_count); 3301 3302 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3303 for (int j = 0; j < argument_count; j++) { 3304 const u2 argument_index = cfs->get_u2_fast(); 3305 check_property( 3306 valid_cp_range(argument_index, cp_size) && 3307 cp->tag_at(argument_index).is_loadable_constant(), 3308 "argument_index %u has bad constant type in class file %s", 3309 argument_index, 3310 CHECK); 3311 operands->at_put(operand_fill_index++, argument_index); 3312 } 3313 } 3314 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3315 "Bad length on BootstrapMethods in class file %s", 3316 CHECK); 3317 } 3318 3319 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3320 ConstantPool* cp, 3321 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3322 TRAPS) { 3323 assert(cfs != NULL, "invariant"); 3324 assert(cp != NULL, "invariant"); 3325 assert(parsed_annotations != NULL, "invariant"); 3326 3327 // Set inner classes attribute to default sentinel 3328 _inner_classes = Universe::the_empty_short_array(); 3329 // Set nest members attribute to default sentinel 3330 _nest_members = Universe::the_empty_short_array(); 3331 cfs->guarantee_more(2, CHECK); // attributes_count 3332 u2 attributes_count = cfs->get_u2_fast(); 3333 bool parsed_sourcefile_attribute = false; 3334 bool parsed_innerclasses_attribute = false; 3335 bool parsed_nest_members_attribute = false; 3336 bool parsed_nest_host_attribute = false; 3337 bool parsed_enclosingmethod_attribute = false; 3338 bool parsed_bootstrap_methods_attribute = false; 3339 const u1* runtime_visible_annotations = NULL; 3340 int runtime_visible_annotations_length = 0; 3341 const u1* runtime_invisible_annotations = NULL; 3342 int runtime_invisible_annotations_length = 0; 3343 const u1* runtime_visible_type_annotations = NULL; 3344 int runtime_visible_type_annotations_length = 0; 3345 const u1* runtime_invisible_type_annotations = NULL; 3346 int runtime_invisible_type_annotations_length = 0; 3347 bool runtime_invisible_type_annotations_exists = false; 3348 bool runtime_invisible_annotations_exists = false; 3349 bool parsed_source_debug_ext_annotations_exist = false; 3350 const u1* inner_classes_attribute_start = NULL; 3351 u4 inner_classes_attribute_length = 0; 3352 u2 enclosing_method_class_index = 0; 3353 u2 enclosing_method_method_index = 0; 3354 const u1* nest_members_attribute_start = NULL; 3355 u4 nest_members_attribute_length = 0; 3356 3357 // Iterate over attributes 3358 while (attributes_count--) { 3359 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3360 const u2 attribute_name_index = cfs->get_u2_fast(); 3361 const u4 attribute_length = cfs->get_u4_fast(); 3362 check_property( 3363 valid_symbol_at(attribute_name_index), 3364 "Attribute name has bad constant pool index %u in class file %s", 3365 attribute_name_index, CHECK); 3366 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3367 if (tag == vmSymbols::tag_source_file()) { 3368 // Check for SourceFile tag 3369 if (_need_verify) { 3370 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3371 } 3372 if (parsed_sourcefile_attribute) { 3373 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3374 } else { 3375 parsed_sourcefile_attribute = true; 3376 } 3377 parse_classfile_sourcefile_attribute(cfs, CHECK); 3378 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3379 // Check for SourceDebugExtension tag 3380 if (parsed_source_debug_ext_annotations_exist) { 3381 classfile_parse_error( 3382 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3383 } 3384 parsed_source_debug_ext_annotations_exist = true; 3385 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3386 } else if (tag == vmSymbols::tag_inner_classes()) { 3387 // Check for InnerClasses tag 3388 if (parsed_innerclasses_attribute) { 3389 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3390 } else { 3391 parsed_innerclasses_attribute = true; 3392 } 3393 inner_classes_attribute_start = cfs->current(); 3394 inner_classes_attribute_length = attribute_length; 3395 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3396 } else if (tag == vmSymbols::tag_synthetic()) { 3397 // Check for Synthetic tag 3398 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3399 if (attribute_length != 0) { 3400 classfile_parse_error( 3401 "Invalid Synthetic classfile attribute length %u in class file %s", 3402 attribute_length, CHECK); 3403 } 3404 parse_classfile_synthetic_attribute(CHECK); 3405 } else if (tag == vmSymbols::tag_deprecated()) { 3406 // Check for Deprecatd tag - 4276120 3407 if (attribute_length != 0) { 3408 classfile_parse_error( 3409 "Invalid Deprecated classfile attribute length %u in class file %s", 3410 attribute_length, CHECK); 3411 } 3412 } else if (_major_version >= JAVA_1_5_VERSION) { 3413 if (tag == vmSymbols::tag_signature()) { 3414 if (_generic_signature_index != 0) { 3415 classfile_parse_error( 3416 "Multiple Signature attributes in class file %s", CHECK); 3417 } 3418 if (attribute_length != 2) { 3419 classfile_parse_error( 3420 "Wrong Signature attribute length %u in class file %s", 3421 attribute_length, CHECK); 3422 } 3423 parse_classfile_signature_attribute(cfs, CHECK); 3424 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3425 if (runtime_visible_annotations != NULL) { 3426 classfile_parse_error( 3427 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3428 } 3429 runtime_visible_annotations_length = attribute_length; 3430 runtime_visible_annotations = cfs->current(); 3431 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3432 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3433 parse_annotations(cp, 3434 runtime_visible_annotations, 3435 runtime_visible_annotations_length, 3436 parsed_annotations, 3437 _loader_data, 3438 CHECK); 3439 cfs->skip_u1_fast(runtime_visible_annotations_length); 3440 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3441 if (runtime_invisible_annotations_exists) { 3442 classfile_parse_error( 3443 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3444 } 3445 runtime_invisible_annotations_exists = true; 3446 if (PreserveAllAnnotations) { 3447 runtime_invisible_annotations_length = attribute_length; 3448 runtime_invisible_annotations = cfs->current(); 3449 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3450 } 3451 cfs->skip_u1(attribute_length, CHECK); 3452 } else if (tag == vmSymbols::tag_enclosing_method()) { 3453 if (parsed_enclosingmethod_attribute) { 3454 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3455 } else { 3456 parsed_enclosingmethod_attribute = true; 3457 } 3458 guarantee_property(attribute_length == 4, 3459 "Wrong EnclosingMethod attribute length %u in class file %s", 3460 attribute_length, CHECK); 3461 cfs->guarantee_more(4, CHECK); // class_index, method_index 3462 enclosing_method_class_index = cfs->get_u2_fast(); 3463 enclosing_method_method_index = cfs->get_u2_fast(); 3464 if (enclosing_method_class_index == 0) { 3465 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3466 } 3467 // Validate the constant pool indices and types 3468 check_property(valid_klass_reference_at(enclosing_method_class_index), 3469 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3470 if (enclosing_method_method_index != 0 && 3471 (!cp->is_within_bounds(enclosing_method_method_index) || 3472 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3473 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3474 } 3475 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3476 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3477 if (parsed_bootstrap_methods_attribute) { 3478 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3479 } 3480 parsed_bootstrap_methods_attribute = true; 3481 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3482 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3483 if (runtime_visible_type_annotations != NULL) { 3484 classfile_parse_error( 3485 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3486 } 3487 runtime_visible_type_annotations_length = attribute_length; 3488 runtime_visible_type_annotations = cfs->current(); 3489 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3490 // No need for the VM to parse Type annotations 3491 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3492 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3493 if (runtime_invisible_type_annotations_exists) { 3494 classfile_parse_error( 3495 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3496 } else { 3497 runtime_invisible_type_annotations_exists = true; 3498 } 3499 if (PreserveAllAnnotations) { 3500 runtime_invisible_type_annotations_length = attribute_length; 3501 runtime_invisible_type_annotations = cfs->current(); 3502 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3503 } 3504 cfs->skip_u1(attribute_length, CHECK); 3505 } else if (_major_version >= JAVA_11_VERSION) { 3506 if (tag == vmSymbols::tag_nest_members()) { 3507 // Check for NestMembers tag 3508 if (parsed_nest_members_attribute) { 3509 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK); 3510 } else { 3511 parsed_nest_members_attribute = true; 3512 } 3513 if (parsed_nest_host_attribute) { 3514 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK); 3515 } 3516 nest_members_attribute_start = cfs->current(); 3517 nest_members_attribute_length = attribute_length; 3518 cfs->skip_u1(nest_members_attribute_length, CHECK); 3519 } else if (tag == vmSymbols::tag_nest_host()) { 3520 if (parsed_nest_host_attribute) { 3521 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK); 3522 } else { 3523 parsed_nest_host_attribute = true; 3524 } 3525 if (parsed_nest_members_attribute) { 3526 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK); 3527 } 3528 if (_need_verify) { 3529 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3530 } 3531 cfs->guarantee_more(2, CHECK); 3532 u2 class_info_index = cfs->get_u2_fast(); 3533 check_property( 3534 valid_klass_reference_at(class_info_index), 3535 "Nest-host class_info_index %u has bad constant type in class file %s", 3536 class_info_index, CHECK); 3537 _nest_host = class_info_index; 3538 } else { 3539 // Unknown attribute 3540 cfs->skip_u1(attribute_length, CHECK); 3541 } 3542 } else { 3543 // Unknown attribute 3544 cfs->skip_u1(attribute_length, CHECK); 3545 } 3546 } else { 3547 // Unknown attribute 3548 cfs->skip_u1(attribute_length, CHECK); 3549 } 3550 } 3551 _annotations = assemble_annotations(runtime_visible_annotations, 3552 runtime_visible_annotations_length, 3553 runtime_invisible_annotations, 3554 runtime_invisible_annotations_length, 3555 CHECK); 3556 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3557 runtime_visible_type_annotations_length, 3558 runtime_invisible_type_annotations, 3559 runtime_invisible_type_annotations_length, 3560 CHECK); 3561 3562 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3563 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3564 cfs, 3565 inner_classes_attribute_start, 3566 parsed_innerclasses_attribute, 3567 enclosing_method_class_index, 3568 enclosing_method_method_index, 3569 CHECK); 3570 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3571 guarantee_property( 3572 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3573 "Wrong InnerClasses attribute length in class file %s", CHECK); 3574 } 3575 } 3576 3577 if (parsed_nest_members_attribute) { 3578 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3579 cfs, 3580 nest_members_attribute_start, 3581 CHECK); 3582 if (_need_verify) { 3583 guarantee_property( 3584 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3585 "Wrong NestMembers attribute length in class file %s", CHECK); 3586 } 3587 } 3588 3589 if (_max_bootstrap_specifier_index >= 0) { 3590 guarantee_property(parsed_bootstrap_methods_attribute, 3591 "Missing BootstrapMethods attribute in class file %s", CHECK); 3592 } 3593 } 3594 3595 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3596 assert(k != NULL, "invariant"); 3597 3598 if (_synthetic_flag) 3599 k->set_is_synthetic(); 3600 if (_sourcefile_index != 0) { 3601 k->set_source_file_name_index(_sourcefile_index); 3602 } 3603 if (_generic_signature_index != 0) { 3604 k->set_generic_signature_index(_generic_signature_index); 3605 } 3606 if (_sde_buffer != NULL) { 3607 k->set_source_debug_extension(_sde_buffer, _sde_length); 3608 } 3609 } 3610 3611 // Create the Annotations object that will 3612 // hold the annotations array for the Klass. 3613 void ClassFileParser::create_combined_annotations(TRAPS) { 3614 if (_annotations == NULL && 3615 _type_annotations == NULL && 3616 _fields_annotations == NULL && 3617 _fields_type_annotations == NULL) { 3618 // Don't create the Annotations object unnecessarily. 3619 return; 3620 } 3621 3622 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3623 annotations->set_class_annotations(_annotations); 3624 annotations->set_class_type_annotations(_type_annotations); 3625 annotations->set_fields_annotations(_fields_annotations); 3626 annotations->set_fields_type_annotations(_fields_type_annotations); 3627 3628 // This is the Annotations object that will be 3629 // assigned to InstanceKlass being constructed. 3630 _combined_annotations = annotations; 3631 3632 // The annotations arrays below has been transfered the 3633 // _combined_annotations so these fields can now be cleared. 3634 _annotations = NULL; 3635 _type_annotations = NULL; 3636 _fields_annotations = NULL; 3637 _fields_type_annotations = NULL; 3638 } 3639 3640 // Transfer ownership of metadata allocated to the InstanceKlass. 3641 void ClassFileParser::apply_parsed_class_metadata( 3642 InstanceKlass* this_klass, 3643 int java_fields_count, TRAPS) { 3644 assert(this_klass != NULL, "invariant"); 3645 3646 _cp->set_pool_holder(this_klass); 3647 this_klass->set_constants(_cp); 3648 this_klass->set_fields(_fields, java_fields_count); 3649 this_klass->set_methods(_methods); 3650 this_klass->set_inner_classes(_inner_classes); 3651 this_klass->set_nest_members(_nest_members); 3652 this_klass->set_nest_host_index(_nest_host); 3653 this_klass->set_local_interfaces(_local_interfaces); 3654 this_klass->set_annotations(_combined_annotations); 3655 // Delay the setting of _transitive_interfaces until after initialize_supers() in 3656 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with 3657 // its _super. If an OOM occurs while loading the current klass, its _super field 3658 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3659 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3660 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3661 3662 // Clear out these fields so they don't get deallocated by the destructor 3663 clear_class_metadata(); 3664 } 3665 3666 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3667 int runtime_visible_annotations_length, 3668 const u1* const runtime_invisible_annotations, 3669 int runtime_invisible_annotations_length, 3670 TRAPS) { 3671 AnnotationArray* annotations = NULL; 3672 if (runtime_visible_annotations != NULL || 3673 runtime_invisible_annotations != NULL) { 3674 annotations = MetadataFactory::new_array<u1>(_loader_data, 3675 runtime_visible_annotations_length + 3676 runtime_invisible_annotations_length, 3677 CHECK_(annotations)); 3678 if (runtime_visible_annotations != NULL) { 3679 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3680 annotations->at_put(i, runtime_visible_annotations[i]); 3681 } 3682 } 3683 if (runtime_invisible_annotations != NULL) { 3684 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3685 int append = runtime_visible_annotations_length+i; 3686 annotations->at_put(append, runtime_invisible_annotations[i]); 3687 } 3688 } 3689 } 3690 return annotations; 3691 } 3692 3693 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3694 const int super_class_index, 3695 const bool need_verify, 3696 TRAPS) { 3697 assert(cp != NULL, "invariant"); 3698 const InstanceKlass* super_klass = NULL; 3699 3700 if (super_class_index == 0) { 3701 check_property(_class_name == vmSymbols::java_lang_Object(), 3702 "Invalid superclass index %u in class file %s", 3703 super_class_index, 3704 CHECK_NULL); 3705 } else { 3706 check_property(valid_klass_reference_at(super_class_index), 3707 "Invalid superclass index %u in class file %s", 3708 super_class_index, 3709 CHECK_NULL); 3710 // The class name should be legal because it is checked when parsing constant pool. 3711 // However, make sure it is not an array type. 3712 bool is_array = false; 3713 if (cp->tag_at(super_class_index).is_klass()) { 3714 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3715 if (need_verify) 3716 is_array = super_klass->is_array_klass(); 3717 } else if (need_verify) { 3718 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY); 3719 } 3720 if (need_verify) { 3721 guarantee_property(!is_array, 3722 "Bad superclass name in class file %s", CHECK_NULL); 3723 } 3724 } 3725 return super_klass; 3726 } 3727 3728 static unsigned int compute_oop_map_count(const InstanceKlass* super, 3729 unsigned int nonstatic_oop_map_count, 3730 int first_nonstatic_oop_offset) { 3731 3732 unsigned int map_count = 3733 NULL == super ? 0 : super->nonstatic_oop_map_count(); 3734 if (nonstatic_oop_map_count > 0) { 3735 // We have oops to add to map 3736 if (map_count == 0) { 3737 map_count = nonstatic_oop_map_count; 3738 } 3739 else { 3740 // Check whether we should add a new map block or whether the last one can 3741 // be extended 3742 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3743 const OopMapBlock* const last_map = first_map + map_count - 1; 3744 3745 const int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3746 if (next_offset == first_nonstatic_oop_offset) { 3747 // There is no gap bettwen superklass's last oop field and first 3748 // local oop field, merge maps. 3749 nonstatic_oop_map_count -= 1; 3750 } 3751 else { 3752 // Superklass didn't end with a oop field, add extra maps 3753 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3754 } 3755 map_count += nonstatic_oop_map_count; 3756 } 3757 } 3758 return map_count; 3759 } 3760 3761 #ifndef PRODUCT 3762 static void print_field_layout(const Symbol* name, 3763 Array<u2>* fields, 3764 const constantPoolHandle& cp, 3765 int instance_size, 3766 int instance_fields_start, 3767 int instance_fields_end, 3768 int static_fields_end) { 3769 3770 assert(name != NULL, "invariant"); 3771 3772 tty->print("%s: field layout\n", name->as_klass_external_name()); 3773 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3774 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3775 if (!fs.access_flags().is_static()) { 3776 tty->print(" @%3d \"%s\" %s\n", 3777 fs.offset(), 3778 fs.name()->as_klass_external_name(), 3779 fs.signature()->as_klass_external_name()); 3780 } 3781 } 3782 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3783 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3784 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3785 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3786 if (fs.access_flags().is_static()) { 3787 tty->print(" @%3d \"%s\" %s\n", 3788 fs.offset(), 3789 fs.name()->as_klass_external_name(), 3790 fs.signature()->as_klass_external_name()); 3791 } 3792 } 3793 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 3794 tty->print("\n"); 3795 } 3796 #endif 3797 3798 // Values needed for oopmap and InstanceKlass creation 3799 class ClassFileParser::FieldLayoutInfo : public ResourceObj { 3800 public: 3801 int* nonstatic_oop_offsets; 3802 unsigned int* nonstatic_oop_counts; 3803 unsigned int nonstatic_oop_map_count; 3804 unsigned int total_oop_map_count; 3805 int instance_size; 3806 int nonstatic_field_size; 3807 int static_field_size; 3808 bool has_nonstatic_fields; 3809 }; 3810 3811 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3812 void ClassFileParser::layout_fields(ConstantPool* cp, 3813 const FieldAllocationCount* fac, 3814 const ClassAnnotationCollector* parsed_annotations, 3815 FieldLayoutInfo* info, 3816 TRAPS) { 3817 3818 assert(cp != NULL, "invariant"); 3819 3820 // Field size and offset computation 3821 int nonstatic_field_size = _super_klass == NULL ? 0 : 3822 _super_klass->nonstatic_field_size(); 3823 3824 // Count the contended fields by type. 3825 // 3826 // We ignore static fields, because @Contended is not supported for them. 3827 // The layout code below will also ignore the static fields. 3828 int nonstatic_contended_count = 0; 3829 FieldAllocationCount fac_contended; 3830 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 3831 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3832 if (fs.is_contended()) { 3833 fac_contended.count[atype]++; 3834 if (!fs.access_flags().is_static()) { 3835 nonstatic_contended_count++; 3836 } 3837 } 3838 } 3839 3840 3841 // Calculate the starting byte offsets 3842 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3843 int next_static_double_offset = next_static_oop_offset + 3844 ((fac->count[STATIC_OOP]) * heapOopSize); 3845 if (fac->count[STATIC_DOUBLE]) { 3846 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 3847 } 3848 3849 int next_static_word_offset = next_static_double_offset + 3850 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3851 int next_static_short_offset = next_static_word_offset + 3852 ((fac->count[STATIC_WORD]) * BytesPerInt); 3853 int next_static_byte_offset = next_static_short_offset + 3854 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3855 3856 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3857 nonstatic_field_size * heapOopSize; 3858 3859 int next_nonstatic_field_offset = nonstatic_fields_start; 3860 3861 const bool is_contended_class = parsed_annotations->is_contended(); 3862 3863 // Class is contended, pad before all the fields 3864 if (is_contended_class) { 3865 next_nonstatic_field_offset += ContendedPaddingWidth; 3866 } 3867 3868 // Compute the non-contended fields count. 3869 // The packing code below relies on these counts to determine if some field 3870 // can be squeezed into the alignment gap. Contended fields are obviously 3871 // exempt from that. 3872 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3873 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3874 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3875 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3876 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3877 3878 // Total non-static fields count, including every contended field 3879 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3880 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3881 fac->count[NONSTATIC_OOP]; 3882 3883 const bool super_has_nonstatic_fields = 3884 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 3885 const bool has_nonstatic_fields = 3886 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3887 3888 3889 // Prepare list of oops for oop map generation. 3890 // 3891 // "offset" and "count" lists are describing the set of contiguous oop 3892 // regions. offset[i] is the start of the i-th region, which then has 3893 // count[i] oops following. Before we know how many regions are required, 3894 // we pessimistically allocate the maps to fit all the oops into the 3895 // distinct regions. 3896 // 3897 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3898 // to figure out if we still need to do this. 3899 unsigned int nonstatic_oop_map_count = 0; 3900 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3901 3902 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3903 THREAD, int, max_nonstatic_oop_maps); 3904 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3905 THREAD, unsigned int, max_nonstatic_oop_maps); 3906 3907 int first_nonstatic_oop_offset = 0; // will be set for first oop field 3908 3909 bool compact_fields = CompactFields; 3910 int allocation_style = FieldsAllocationStyle; 3911 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3912 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3913 allocation_style = 1; // Optimistic 3914 } 3915 3916 // The next classes have predefined hard-coded fields offsets 3917 // (see in JavaClasses::compute_hard_coded_offsets()). 3918 // Use default fields allocation order for them. 3919 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL && 3920 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3921 _class_name == vmSymbols::java_lang_Class() || 3922 _class_name == vmSymbols::java_lang_ClassLoader() || 3923 _class_name == vmSymbols::java_lang_ref_Reference() || 3924 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3925 _class_name == vmSymbols::java_lang_StackTraceElement() || 3926 _class_name == vmSymbols::java_lang_String() || 3927 _class_name == vmSymbols::java_lang_Throwable() || 3928 _class_name == vmSymbols::java_lang_Boolean() || 3929 _class_name == vmSymbols::java_lang_Character() || 3930 _class_name == vmSymbols::java_lang_Float() || 3931 _class_name == vmSymbols::java_lang_Double() || 3932 _class_name == vmSymbols::java_lang_Byte() || 3933 _class_name == vmSymbols::java_lang_Short() || 3934 _class_name == vmSymbols::java_lang_Integer() || 3935 _class_name == vmSymbols::java_lang_Long())) { 3936 allocation_style = 0; // Allocate oops first 3937 compact_fields = false; // Don't compact fields 3938 } 3939 3940 int next_nonstatic_oop_offset = 0; 3941 int next_nonstatic_double_offset = 0; 3942 3943 // Rearrange fields for a given allocation style 3944 if( allocation_style == 0 ) { 3945 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3946 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3947 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3948 (nonstatic_oop_count * heapOopSize); 3949 } else if( allocation_style == 1 ) { 3950 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3951 next_nonstatic_double_offset = next_nonstatic_field_offset; 3952 } else if( allocation_style == 2 ) { 3953 // Fields allocation: oops fields in super and sub classes are together. 3954 if( nonstatic_field_size > 0 && _super_klass != NULL && 3955 _super_klass->nonstatic_oop_map_size() > 0 ) { 3956 const unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3957 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps(); 3958 const OopMapBlock* const last_map = first_map + map_count - 1; 3959 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3960 if (next_offset == next_nonstatic_field_offset) { 3961 allocation_style = 0; // allocate oops first 3962 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3963 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3964 (nonstatic_oop_count * heapOopSize); 3965 } 3966 } 3967 if( allocation_style == 2 ) { 3968 allocation_style = 1; // allocate oops last 3969 next_nonstatic_double_offset = next_nonstatic_field_offset; 3970 } 3971 } else { 3972 ShouldNotReachHere(); 3973 } 3974 3975 int nonstatic_oop_space_count = 0; 3976 int nonstatic_word_space_count = 0; 3977 int nonstatic_short_space_count = 0; 3978 int nonstatic_byte_space_count = 0; 3979 int nonstatic_oop_space_offset = 0; 3980 int nonstatic_word_space_offset = 0; 3981 int nonstatic_short_space_offset = 0; 3982 int nonstatic_byte_space_offset = 0; 3983 3984 // Try to squeeze some of the fields into the gaps due to 3985 // long/double alignment. 3986 if (nonstatic_double_count > 0) { 3987 int offset = next_nonstatic_double_offset; 3988 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 3989 if (compact_fields && offset != next_nonstatic_double_offset) { 3990 // Allocate available fields into the gap before double field. 3991 int length = next_nonstatic_double_offset - offset; 3992 assert(length == BytesPerInt, ""); 3993 nonstatic_word_space_offset = offset; 3994 if (nonstatic_word_count > 0) { 3995 nonstatic_word_count -= 1; 3996 nonstatic_word_space_count = 1; // Only one will fit 3997 length -= BytesPerInt; 3998 offset += BytesPerInt; 3999 } 4000 nonstatic_short_space_offset = offset; 4001 while (length >= BytesPerShort && nonstatic_short_count > 0) { 4002 nonstatic_short_count -= 1; 4003 nonstatic_short_space_count += 1; 4004 length -= BytesPerShort; 4005 offset += BytesPerShort; 4006 } 4007 nonstatic_byte_space_offset = offset; 4008 while (length > 0 && nonstatic_byte_count > 0) { 4009 nonstatic_byte_count -= 1; 4010 nonstatic_byte_space_count += 1; 4011 length -= 1; 4012 } 4013 // Allocate oop field in the gap if there are no other fields for that. 4014 nonstatic_oop_space_offset = offset; 4015 if (length >= heapOopSize && nonstatic_oop_count > 0 && 4016 allocation_style != 0) { // when oop fields not first 4017 nonstatic_oop_count -= 1; 4018 nonstatic_oop_space_count = 1; // Only one will fit 4019 length -= heapOopSize; 4020 offset += heapOopSize; 4021 } 4022 } 4023 } 4024 4025 int next_nonstatic_word_offset = next_nonstatic_double_offset + 4026 (nonstatic_double_count * BytesPerLong); 4027 int next_nonstatic_short_offset = next_nonstatic_word_offset + 4028 (nonstatic_word_count * BytesPerInt); 4029 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 4030 (nonstatic_short_count * BytesPerShort); 4031 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 4032 nonstatic_byte_count; 4033 4034 // let oops jump before padding with this allocation style 4035 if( allocation_style == 1 ) { 4036 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 4037 if( nonstatic_oop_count > 0 ) { 4038 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 4039 } 4040 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 4041 } 4042 4043 // Iterate over fields again and compute correct offsets. 4044 // The field allocation type was temporarily stored in the offset slot. 4045 // oop fields are located before non-oop fields (static and non-static). 4046 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4047 4048 // skip already laid out fields 4049 if (fs.is_offset_set()) continue; 4050 4051 // contended instance fields are handled below 4052 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 4053 4054 int real_offset = 0; 4055 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4056 4057 // pack the rest of the fields 4058 switch (atype) { 4059 case STATIC_OOP: 4060 real_offset = next_static_oop_offset; 4061 next_static_oop_offset += heapOopSize; 4062 break; 4063 case STATIC_BYTE: 4064 real_offset = next_static_byte_offset; 4065 next_static_byte_offset += 1; 4066 break; 4067 case STATIC_SHORT: 4068 real_offset = next_static_short_offset; 4069 next_static_short_offset += BytesPerShort; 4070 break; 4071 case STATIC_WORD: 4072 real_offset = next_static_word_offset; 4073 next_static_word_offset += BytesPerInt; 4074 break; 4075 case STATIC_DOUBLE: 4076 real_offset = next_static_double_offset; 4077 next_static_double_offset += BytesPerLong; 4078 break; 4079 case NONSTATIC_OOP: 4080 if( nonstatic_oop_space_count > 0 ) { 4081 real_offset = nonstatic_oop_space_offset; 4082 nonstatic_oop_space_offset += heapOopSize; 4083 nonstatic_oop_space_count -= 1; 4084 } else { 4085 real_offset = next_nonstatic_oop_offset; 4086 next_nonstatic_oop_offset += heapOopSize; 4087 } 4088 4089 // Record this oop in the oop maps 4090 if( nonstatic_oop_map_count > 0 && 4091 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4092 real_offset - 4093 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4094 heapOopSize ) { 4095 // This oop is adjacent to the previous one, add to current oop map 4096 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4097 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4098 } else { 4099 // This oop is not adjacent to the previous one, create new oop map 4100 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4101 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4102 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4103 nonstatic_oop_map_count += 1; 4104 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4105 first_nonstatic_oop_offset = real_offset; 4106 } 4107 } 4108 break; 4109 case NONSTATIC_BYTE: 4110 if( nonstatic_byte_space_count > 0 ) { 4111 real_offset = nonstatic_byte_space_offset; 4112 nonstatic_byte_space_offset += 1; 4113 nonstatic_byte_space_count -= 1; 4114 } else { 4115 real_offset = next_nonstatic_byte_offset; 4116 next_nonstatic_byte_offset += 1; 4117 } 4118 break; 4119 case NONSTATIC_SHORT: 4120 if( nonstatic_short_space_count > 0 ) { 4121 real_offset = nonstatic_short_space_offset; 4122 nonstatic_short_space_offset += BytesPerShort; 4123 nonstatic_short_space_count -= 1; 4124 } else { 4125 real_offset = next_nonstatic_short_offset; 4126 next_nonstatic_short_offset += BytesPerShort; 4127 } 4128 break; 4129 case NONSTATIC_WORD: 4130 if( nonstatic_word_space_count > 0 ) { 4131 real_offset = nonstatic_word_space_offset; 4132 nonstatic_word_space_offset += BytesPerInt; 4133 nonstatic_word_space_count -= 1; 4134 } else { 4135 real_offset = next_nonstatic_word_offset; 4136 next_nonstatic_word_offset += BytesPerInt; 4137 } 4138 break; 4139 case NONSTATIC_DOUBLE: 4140 real_offset = next_nonstatic_double_offset; 4141 next_nonstatic_double_offset += BytesPerLong; 4142 break; 4143 default: 4144 ShouldNotReachHere(); 4145 } 4146 fs.set_offset(real_offset); 4147 } 4148 4149 4150 // Handle the contended cases. 4151 // 4152 // Each contended field should not intersect the cache line with another contended field. 4153 // In the absence of alignment information, we end up with pessimistically separating 4154 // the fields with full-width padding. 4155 // 4156 // Additionally, this should not break alignment for the fields, so we round the alignment up 4157 // for each field. 4158 if (nonstatic_contended_count > 0) { 4159 4160 // if there is at least one contended field, we need to have pre-padding for them 4161 next_nonstatic_padded_offset += ContendedPaddingWidth; 4162 4163 // collect all contended groups 4164 ResourceBitMap bm(cp->size()); 4165 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4166 // skip already laid out fields 4167 if (fs.is_offset_set()) continue; 4168 4169 if (fs.is_contended()) { 4170 bm.set_bit(fs.contended_group()); 4171 } 4172 } 4173 4174 int current_group = -1; 4175 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4176 4177 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4178 4179 // skip already laid out fields 4180 if (fs.is_offset_set()) continue; 4181 4182 // skip non-contended fields and fields from different group 4183 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4184 4185 // handle statics below 4186 if (fs.access_flags().is_static()) continue; 4187 4188 int real_offset = 0; 4189 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4190 4191 switch (atype) { 4192 case NONSTATIC_BYTE: 4193 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4194 real_offset = next_nonstatic_padded_offset; 4195 next_nonstatic_padded_offset += 1; 4196 break; 4197 4198 case NONSTATIC_SHORT: 4199 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4200 real_offset = next_nonstatic_padded_offset; 4201 next_nonstatic_padded_offset += BytesPerShort; 4202 break; 4203 4204 case NONSTATIC_WORD: 4205 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4206 real_offset = next_nonstatic_padded_offset; 4207 next_nonstatic_padded_offset += BytesPerInt; 4208 break; 4209 4210 case NONSTATIC_DOUBLE: 4211 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4212 real_offset = next_nonstatic_padded_offset; 4213 next_nonstatic_padded_offset += BytesPerLong; 4214 break; 4215 4216 case NONSTATIC_OOP: 4217 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4218 real_offset = next_nonstatic_padded_offset; 4219 next_nonstatic_padded_offset += heapOopSize; 4220 4221 // Record this oop in the oop maps 4222 if( nonstatic_oop_map_count > 0 && 4223 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4224 real_offset - 4225 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4226 heapOopSize ) { 4227 // This oop is adjacent to the previous one, add to current oop map 4228 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4229 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4230 } else { 4231 // This oop is not adjacent to the previous one, create new oop map 4232 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4233 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4234 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4235 nonstatic_oop_map_count += 1; 4236 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4237 first_nonstatic_oop_offset = real_offset; 4238 } 4239 } 4240 break; 4241 4242 default: 4243 ShouldNotReachHere(); 4244 } 4245 4246 if (fs.contended_group() == 0) { 4247 // Contended group defines the equivalence class over the fields: 4248 // the fields within the same contended group are not inter-padded. 4249 // The only exception is default group, which does not incur the 4250 // equivalence, and so requires intra-padding. 4251 next_nonstatic_padded_offset += ContendedPaddingWidth; 4252 } 4253 4254 fs.set_offset(real_offset); 4255 } // for 4256 4257 // Start laying out the next group. 4258 // Note that this will effectively pad the last group in the back; 4259 // this is expected to alleviate memory contention effects for 4260 // subclass fields and/or adjacent object. 4261 // If this was the default group, the padding is already in place. 4262 if (current_group != 0) { 4263 next_nonstatic_padded_offset += ContendedPaddingWidth; 4264 } 4265 } 4266 4267 // handle static fields 4268 } 4269 4270 // Entire class is contended, pad in the back. 4271 // This helps to alleviate memory contention effects for subclass fields 4272 // and/or adjacent object. 4273 if (is_contended_class) { 4274 next_nonstatic_padded_offset += ContendedPaddingWidth; 4275 } 4276 4277 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4278 4279 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize); 4280 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4281 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4282 4283 int static_field_size = (static_fields_end - 4284 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4285 nonstatic_field_size = nonstatic_field_size + 4286 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4287 4288 int instance_size = align_object_size(instance_end / wordSize); 4289 4290 assert(instance_size == align_object_size(align_up( 4291 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 4292 wordSize) / wordSize), "consistent layout helper value"); 4293 4294 // Invariant: nonstatic_field end/start should only change if there are 4295 // nonstatic fields in the class, or if the class is contended. We compare 4296 // against the non-aligned value, so that end alignment will not fail the 4297 // assert without actually having the fields. 4298 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4299 is_contended_class || 4300 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4301 4302 // Number of non-static oop map blocks allocated at end of klass. 4303 const unsigned int total_oop_map_count = 4304 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 4305 first_nonstatic_oop_offset); 4306 4307 #ifndef PRODUCT 4308 if (PrintFieldLayout) { 4309 print_field_layout(_class_name, 4310 _fields, 4311 cp, 4312 instance_size, 4313 nonstatic_fields_start, 4314 nonstatic_fields_end, 4315 static_fields_end); 4316 } 4317 4318 #endif 4319 // Pass back information needed for InstanceKlass creation 4320 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 4321 info->nonstatic_oop_counts = nonstatic_oop_counts; 4322 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 4323 info->total_oop_map_count = total_oop_map_count; 4324 info->instance_size = instance_size; 4325 info->static_field_size = static_field_size; 4326 info->nonstatic_field_size = nonstatic_field_size; 4327 info->has_nonstatic_fields = has_nonstatic_fields; 4328 } 4329 4330 static void fill_oop_maps(const InstanceKlass* k, 4331 unsigned int nonstatic_oop_map_count, 4332 const int* nonstatic_oop_offsets, 4333 const unsigned int* nonstatic_oop_counts) { 4334 4335 assert(k != NULL, "invariant"); 4336 4337 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4338 const InstanceKlass* const super = k->superklass(); 4339 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4340 if (super_count > 0) { 4341 // Copy maps from superklass 4342 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4343 for (unsigned int i = 0; i < super_count; ++i) { 4344 *this_oop_map++ = *super_oop_map++; 4345 } 4346 } 4347 4348 if (nonstatic_oop_map_count > 0) { 4349 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4350 // The counts differ because there is no gap between superklass's last oop 4351 // field and the first local oop field. Extend the last oop map copied 4352 // from the superklass instead of creating new one. 4353 nonstatic_oop_map_count--; 4354 nonstatic_oop_offsets++; 4355 this_oop_map--; 4356 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4357 this_oop_map++; 4358 } 4359 4360 // Add new map blocks, fill them 4361 while (nonstatic_oop_map_count-- > 0) { 4362 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4363 this_oop_map->set_count(*nonstatic_oop_counts++); 4364 this_oop_map++; 4365 } 4366 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4367 this_oop_map, "sanity"); 4368 } 4369 } 4370 4371 4372 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4373 assert(ik != NULL, "invariant"); 4374 4375 const Klass* const super = ik->super(); 4376 4377 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4378 // in which case we don't have to register objects as finalizable 4379 if (!_has_empty_finalizer) { 4380 if (_has_finalizer || 4381 (super != NULL && super->has_finalizer())) { 4382 ik->set_has_finalizer(); 4383 } 4384 } 4385 4386 #ifdef ASSERT 4387 bool f = false; 4388 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4389 vmSymbols::void_method_signature()); 4390 if (m != NULL && !m->is_empty_method()) { 4391 f = true; 4392 } 4393 4394 // Spec doesn't prevent agent from redefinition of empty finalizer. 4395 // Despite the fact that it's generally bad idea and redefined finalizer 4396 // will not work as expected we shouldn't abort vm in this case 4397 if (!ik->has_redefined_this_or_super()) { 4398 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4399 } 4400 #endif 4401 4402 // Check if this klass supports the java.lang.Cloneable interface 4403 if (SystemDictionary::Cloneable_klass_loaded()) { 4404 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4405 ik->set_is_cloneable(); 4406 } 4407 } 4408 4409 // Check if this klass has a vanilla default constructor 4410 if (super == NULL) { 4411 // java.lang.Object has empty default constructor 4412 ik->set_has_vanilla_constructor(); 4413 } else { 4414 if (super->has_vanilla_constructor() && 4415 _has_vanilla_constructor) { 4416 ik->set_has_vanilla_constructor(); 4417 } 4418 #ifdef ASSERT 4419 bool v = false; 4420 if (super->has_vanilla_constructor()) { 4421 const Method* const constructor = 4422 ik->find_method(vmSymbols::object_initializer_name(), 4423 vmSymbols::void_method_signature()); 4424 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4425 v = true; 4426 } 4427 } 4428 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4429 #endif 4430 } 4431 4432 // If it cannot be fast-path allocated, set a bit in the layout helper. 4433 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4434 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4435 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4436 || ik->is_abstract() || ik->is_interface() 4437 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4438 || ik->size_helper() >= FastAllocateSizeLimit) { 4439 // Forbid fast-path allocation. 4440 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4441 ik->set_layout_helper(lh); 4442 } 4443 } 4444 4445 // utility methods for appending an array with check for duplicates 4446 4447 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4448 const Array<InstanceKlass*>* const ifs) { 4449 // iterate over new interfaces 4450 for (int i = 0; i < ifs->length(); i++) { 4451 InstanceKlass* const e = ifs->at(i); 4452 assert(e->is_klass() && e->is_interface(), "just checking"); 4453 // add new interface 4454 result->append_if_missing(e); 4455 } 4456 } 4457 4458 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4459 Array<InstanceKlass*>* local_ifs, 4460 ClassLoaderData* loader_data, 4461 TRAPS) { 4462 assert(local_ifs != NULL, "invariant"); 4463 assert(loader_data != NULL, "invariant"); 4464 4465 // Compute maximum size for transitive interfaces 4466 int max_transitive_size = 0; 4467 int super_size = 0; 4468 // Add superclass transitive interfaces size 4469 if (super != NULL) { 4470 super_size = super->transitive_interfaces()->length(); 4471 max_transitive_size += super_size; 4472 } 4473 // Add local interfaces' super interfaces 4474 const int local_size = local_ifs->length(); 4475 for (int i = 0; i < local_size; i++) { 4476 InstanceKlass* const l = local_ifs->at(i); 4477 max_transitive_size += l->transitive_interfaces()->length(); 4478 } 4479 // Finally add local interfaces 4480 max_transitive_size += local_size; 4481 // Construct array 4482 if (max_transitive_size == 0) { 4483 // no interfaces, use canonicalized array 4484 return Universe::the_empty_instance_klass_array(); 4485 } else if (max_transitive_size == super_size) { 4486 // no new local interfaces added, share superklass' transitive interface array 4487 return super->transitive_interfaces(); 4488 } else if (max_transitive_size == local_size) { 4489 // only local interfaces added, share local interface array 4490 return local_ifs; 4491 } else { 4492 ResourceMark rm; 4493 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4494 4495 // Copy down from superclass 4496 if (super != NULL) { 4497 append_interfaces(result, super->transitive_interfaces()); 4498 } 4499 4500 // Copy down from local interfaces' superinterfaces 4501 for (int i = 0; i < local_size; i++) { 4502 InstanceKlass* const l = local_ifs->at(i); 4503 append_interfaces(result, l->transitive_interfaces()); 4504 } 4505 // Finally add local interfaces 4506 append_interfaces(result, local_ifs); 4507 4508 // length will be less than the max_transitive_size if duplicates were removed 4509 const int length = result->length(); 4510 assert(length <= max_transitive_size, "just checking"); 4511 Array<InstanceKlass*>* const new_result = 4512 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4513 for (int i = 0; i < length; i++) { 4514 InstanceKlass* const e = result->at(i); 4515 assert(e != NULL, "just checking"); 4516 new_result->at_put(i, e); 4517 } 4518 return new_result; 4519 } 4520 } 4521 4522 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4523 assert(this_klass != NULL, "invariant"); 4524 const Klass* const super = this_klass->super(); 4525 if (super != NULL) { 4526 4527 // If the loader is not the boot loader then throw an exception if its 4528 // superclass is in package jdk.internal.reflect and its loader is not a 4529 // special reflection class loader 4530 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4531 assert(super->is_instance_klass(), "super is not instance klass"); 4532 PackageEntry* super_package = super->package(); 4533 if (super_package != NULL && 4534 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4535 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4536 ResourceMark rm(THREAD); 4537 Exceptions::fthrow( 4538 THREAD_AND_LOCATION, 4539 vmSymbols::java_lang_IllegalAccessError(), 4540 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4541 this_klass->external_name(), 4542 this_klass->class_loader_data()->loader_name_and_id(), 4543 super->external_name()); 4544 return; 4545 } 4546 } 4547 4548 Reflection::VerifyClassAccessResults vca_result = 4549 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4550 if (vca_result != Reflection::ACCESS_OK) { 4551 ResourceMark rm(THREAD); 4552 char* msg = Reflection::verify_class_access_msg(this_klass, 4553 InstanceKlass::cast(super), 4554 vca_result); 4555 if (msg == NULL) { 4556 bool same_module = (this_klass->module() == super->module()); 4557 Exceptions::fthrow( 4558 THREAD_AND_LOCATION, 4559 vmSymbols::java_lang_IllegalAccessError(), 4560 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4561 this_klass->external_name(), 4562 super->is_abstract() ? "abstract " : "", 4563 super->external_name(), 4564 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4565 (same_module) ? "" : "; ", 4566 (same_module) ? "" : super->class_in_module_of_loader()); 4567 } else { 4568 // Add additional message content. 4569 Exceptions::fthrow( 4570 THREAD_AND_LOCATION, 4571 vmSymbols::java_lang_IllegalAccessError(), 4572 "superclass access check failed: %s", 4573 msg); 4574 } 4575 } 4576 } 4577 } 4578 4579 4580 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4581 assert(this_klass != NULL, "invariant"); 4582 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4583 const int lng = local_interfaces->length(); 4584 for (int i = lng - 1; i >= 0; i--) { 4585 InstanceKlass* const k = local_interfaces->at(i); 4586 assert (k != NULL && k->is_interface(), "invalid interface"); 4587 Reflection::VerifyClassAccessResults vca_result = 4588 Reflection::verify_class_access(this_klass, k, false); 4589 if (vca_result != Reflection::ACCESS_OK) { 4590 ResourceMark rm(THREAD); 4591 char* msg = Reflection::verify_class_access_msg(this_klass, 4592 k, 4593 vca_result); 4594 if (msg == NULL) { 4595 bool same_module = (this_klass->module() == k->module()); 4596 Exceptions::fthrow( 4597 THREAD_AND_LOCATION, 4598 vmSymbols::java_lang_IllegalAccessError(), 4599 "class %s cannot access its superinterface %s (%s%s%s)", 4600 this_klass->external_name(), 4601 k->external_name(), 4602 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4603 (same_module) ? "" : "; ", 4604 (same_module) ? "" : k->class_in_module_of_loader()); 4605 } else { 4606 // Add additional message content. 4607 Exceptions::fthrow( 4608 THREAD_AND_LOCATION, 4609 vmSymbols::java_lang_IllegalAccessError(), 4610 "superinterface check failed: %s", 4611 msg); 4612 } 4613 } 4614 } 4615 } 4616 4617 4618 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4619 assert(this_klass != NULL, "invariant"); 4620 const Array<Method*>* const methods = this_klass->methods(); 4621 const int num_methods = methods->length(); 4622 4623 // go thru each method and check if it overrides a final method 4624 for (int index = 0; index < num_methods; index++) { 4625 const Method* const m = methods->at(index); 4626 4627 // skip private, static, and <init> methods 4628 if ((!m->is_private() && !m->is_static()) && 4629 (m->name() != vmSymbols::object_initializer_name())) { 4630 4631 const Symbol* const name = m->name(); 4632 const Symbol* const signature = m->signature(); 4633 const Klass* k = this_klass->super(); 4634 const Method* super_m = NULL; 4635 while (k != NULL) { 4636 // skip supers that don't have final methods. 4637 if (k->has_final_method()) { 4638 // lookup a matching method in the super class hierarchy 4639 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4640 if (super_m == NULL) { 4641 break; // didn't find any match; get out 4642 } 4643 4644 if (super_m->is_final() && !super_m->is_static() && 4645 !super_m->access_flags().is_private()) { 4646 // matching method in super is final, and not static or private 4647 bool can_access = Reflection::verify_member_access(this_klass, 4648 super_m->method_holder(), 4649 super_m->method_holder(), 4650 super_m->access_flags(), 4651 false, false, CHECK); 4652 if (can_access) { 4653 // this class can access super final method and therefore override 4654 ResourceMark rm(THREAD); 4655 Exceptions::fthrow(THREAD_AND_LOCATION, 4656 vmSymbols::java_lang_VerifyError(), 4657 "class %s overrides final method %s.%s%s", 4658 this_klass->external_name(), 4659 super_m->method_holder()->external_name(), 4660 name->as_C_string(), 4661 signature->as_C_string() 4662 ); 4663 return; 4664 } 4665 } 4666 4667 // continue to look from super_m's holder's super. 4668 k = super_m->method_holder()->super(); 4669 continue; 4670 } 4671 4672 k = k->super(); 4673 } 4674 } 4675 } 4676 } 4677 4678 4679 // assumes that this_klass is an interface 4680 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4681 assert(this_klass != NULL, "invariant"); 4682 assert(this_klass->is_interface(), "not an interface"); 4683 const Array<Method*>* methods = this_klass->methods(); 4684 const int num_methods = methods->length(); 4685 4686 for (int index = 0; index < num_methods; index++) { 4687 const Method* const m = methods->at(index); 4688 // if m is static and not the init method, throw a verify error 4689 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4690 ResourceMark rm(THREAD); 4691 Exceptions::fthrow( 4692 THREAD_AND_LOCATION, 4693 vmSymbols::java_lang_VerifyError(), 4694 "Illegal static method %s in interface %s", 4695 m->name()->as_C_string(), 4696 this_klass->external_name() 4697 ); 4698 return; 4699 } 4700 } 4701 } 4702 4703 // utility methods for format checking 4704 4705 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4706 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4707 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4708 if (is_module) { 4709 ResourceMark rm(THREAD); 4710 Exceptions::fthrow( 4711 THREAD_AND_LOCATION, 4712 vmSymbols::java_lang_NoClassDefFoundError(), 4713 "%s is not a class because access_flag ACC_MODULE is set", 4714 _class_name->as_C_string()); 4715 return; 4716 } 4717 4718 if (!_need_verify) { return; } 4719 4720 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4721 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4722 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4723 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4724 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4725 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4726 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4727 4728 if ((is_abstract && is_final) || 4729 (is_interface && !is_abstract) || 4730 (is_interface && major_gte_15 && (is_super || is_enum)) || 4731 (!is_interface && major_gte_15 && is_annotation)) { 4732 ResourceMark rm(THREAD); 4733 Exceptions::fthrow( 4734 THREAD_AND_LOCATION, 4735 vmSymbols::java_lang_ClassFormatError(), 4736 "Illegal class modifiers in class %s: 0x%X", 4737 _class_name->as_C_string(), flags 4738 ); 4739 return; 4740 } 4741 } 4742 4743 static bool has_illegal_visibility(jint flags) { 4744 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4745 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4746 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4747 4748 return ((is_public && is_protected) || 4749 (is_public && is_private) || 4750 (is_protected && is_private)); 4751 } 4752 4753 // A legal major_version.minor_version must be one of the following: 4754 // 4755 // Major_version = 45, any minor_version. 4756 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0. 4757 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present. 4758 // 4759 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4760 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4761 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535 4762 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4763 if (major != max_version) { 4764 ResourceMark rm(THREAD); 4765 Exceptions::fthrow( 4766 THREAD_AND_LOCATION, 4767 vmSymbols::java_lang_UnsupportedClassVersionError(), 4768 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4769 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4770 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4771 return; 4772 } 4773 4774 if (!Arguments::enable_preview()) { 4775 ResourceMark rm(THREAD); 4776 Exceptions::fthrow( 4777 THREAD_AND_LOCATION, 4778 vmSymbols::java_lang_UnsupportedClassVersionError(), 4779 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4780 class_name->as_C_string(), major, minor); 4781 return; 4782 } 4783 4784 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4785 if (major > max_version) { 4786 ResourceMark rm(THREAD); 4787 Exceptions::fthrow( 4788 THREAD_AND_LOCATION, 4789 vmSymbols::java_lang_UnsupportedClassVersionError(), 4790 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4791 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4792 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4793 } else if (major < JAVA_MIN_SUPPORTED_VERSION) { 4794 ResourceMark rm(THREAD); 4795 Exceptions::fthrow( 4796 THREAD_AND_LOCATION, 4797 vmSymbols::java_lang_UnsupportedClassVersionError(), 4798 "%s (class file version %u.%u) was compiled with an invalid major version", 4799 class_name->as_C_string(), major, minor); 4800 } else if (minor != 0) { 4801 ResourceMark rm(THREAD); 4802 Exceptions::fthrow( 4803 THREAD_AND_LOCATION, 4804 vmSymbols::java_lang_UnsupportedClassVersionError(), 4805 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4806 class_name->as_C_string(), major, minor); 4807 } 4808 } 4809 } 4810 } 4811 4812 void ClassFileParser::verify_legal_field_modifiers(jint flags, 4813 bool is_interface, 4814 TRAPS) const { 4815 if (!_need_verify) { return; } 4816 4817 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4818 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4819 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4820 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4821 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4822 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4823 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4824 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4825 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4826 4827 bool is_illegal = false; 4828 4829 if (is_interface) { 4830 if (!is_public || !is_static || !is_final || is_private || 4831 is_protected || is_volatile || is_transient || 4832 (major_gte_15 && is_enum)) { 4833 is_illegal = true; 4834 } 4835 } else { // not interface 4836 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4837 is_illegal = true; 4838 } 4839 } 4840 4841 if (is_illegal) { 4842 ResourceMark rm(THREAD); 4843 Exceptions::fthrow( 4844 THREAD_AND_LOCATION, 4845 vmSymbols::java_lang_ClassFormatError(), 4846 "Illegal field modifiers in class %s: 0x%X", 4847 _class_name->as_C_string(), flags); 4848 return; 4849 } 4850 } 4851 4852 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4853 bool is_interface, 4854 const Symbol* name, 4855 TRAPS) const { 4856 if (!_need_verify) { return; } 4857 4858 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4859 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4860 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4861 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4862 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4863 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4864 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4865 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4866 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4867 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4868 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4869 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4870 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4871 4872 bool is_illegal = false; 4873 4874 if (is_interface) { 4875 if (major_gte_8) { 4876 // Class file version is JAVA_8_VERSION or later Methods of 4877 // interfaces may set any of the flags except ACC_PROTECTED, 4878 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4879 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4880 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4881 (is_native || is_protected || is_final || is_synchronized) || 4882 // If a specific method of a class or interface has its 4883 // ACC_ABSTRACT flag set, it must not have any of its 4884 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4885 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4886 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4887 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4888 (is_abstract && (is_private || is_static || is_strict))) { 4889 is_illegal = true; 4890 } 4891 } else if (major_gte_15) { 4892 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4893 if (!is_public || is_private || is_protected || is_static || is_final || 4894 is_synchronized || is_native || !is_abstract || is_strict) { 4895 is_illegal = true; 4896 } 4897 } else { 4898 // Class file version is pre-JAVA_1_5_VERSION 4899 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4900 is_illegal = true; 4901 } 4902 } 4903 } else { // not interface 4904 if (has_illegal_visibility(flags)) { 4905 is_illegal = true; 4906 } else { 4907 if (is_initializer) { 4908 if (is_static || is_final || is_synchronized || is_native || 4909 is_abstract || (major_gte_15 && is_bridge)) { 4910 is_illegal = true; 4911 } 4912 } else { // not initializer 4913 if (is_abstract) { 4914 if ((is_final || is_native || is_private || is_static || 4915 (major_gte_15 && (is_synchronized || is_strict)))) { 4916 is_illegal = true; 4917 } 4918 } 4919 } 4920 } 4921 } 4922 4923 if (is_illegal) { 4924 ResourceMark rm(THREAD); 4925 Exceptions::fthrow( 4926 THREAD_AND_LOCATION, 4927 vmSymbols::java_lang_ClassFormatError(), 4928 "Method %s in class %s has illegal modifiers: 0x%X", 4929 name->as_C_string(), _class_name->as_C_string(), flags); 4930 return; 4931 } 4932 } 4933 4934 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 4935 int length, 4936 TRAPS) const { 4937 assert(_need_verify, "only called when _need_verify is true"); 4938 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 4939 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4940 } 4941 } 4942 4943 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4944 // In class names, '/' separates unqualified names. This is verified in this function also. 4945 // Method names also may not contain the characters '<' or '>', unless <init> 4946 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4947 // method. Because these names have been checked as special cases before 4948 // calling this method in verify_legal_method_name. 4949 // 4950 // This method is also called from the modular system APIs in modules.cpp 4951 // to verify the validity of module and package names. 4952 bool ClassFileParser::verify_unqualified_name(const char* name, 4953 unsigned int length, 4954 int type) { 4955 for (const char* p = name; p != name + length; p++) { 4956 switch(*p) { 4957 case '.': 4958 case ';': 4959 case '[': 4960 // do not permit '.', ';', or '[' 4961 return false; 4962 case '/': 4963 // check for '//' or leading or trailing '/' which are not legal 4964 // unqualified name must not be empty 4965 if (type == ClassFileParser::LegalClass) { 4966 if (p == name || p+1 >= name+length || *(p+1) == '/') { 4967 return false; 4968 } 4969 } else { 4970 return false; // do not permit '/' unless it's class name 4971 } 4972 break; 4973 case '<': 4974 case '>': 4975 // do not permit '<' or '>' in method names 4976 if (type == ClassFileParser::LegalMethod) { 4977 return false; 4978 } 4979 } 4980 } 4981 return true; 4982 } 4983 4984 // Take pointer to a UTF8 byte string (not NUL-terminated). 4985 // Skip over the longest part of the string that could 4986 // be taken as a fieldname. Allow '/' if slash_ok is true. 4987 // Return a pointer to just past the fieldname. 4988 // Return NULL if no fieldname at all was found, or in the case of slash_ok 4989 // being true, we saw consecutive slashes (meaning we were looking for a 4990 // qualified path but found something that was badly-formed). 4991 static const char* skip_over_field_name(const char* const name, 4992 bool slash_ok, 4993 unsigned int length) { 4994 const char* p; 4995 jboolean last_is_slash = false; 4996 jboolean not_first_ch = false; 4997 4998 for (p = name; p != name + length; not_first_ch = true) { 4999 const char* old_p = p; 5000 jchar ch = *p; 5001 if (ch < 128) { 5002 p++; 5003 // quick check for ascii 5004 if ((ch >= 'a' && ch <= 'z') || 5005 (ch >= 'A' && ch <= 'Z') || 5006 (ch == '_' || ch == '$') || 5007 (not_first_ch && ch >= '0' && ch <= '9')) { 5008 last_is_slash = false; 5009 continue; 5010 } 5011 if (slash_ok && ch == '/') { 5012 if (last_is_slash) { 5013 return NULL; // Don't permit consecutive slashes 5014 } 5015 last_is_slash = true; 5016 continue; 5017 } 5018 } 5019 else { 5020 jint unicode_ch; 5021 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5022 p = tmp_p; 5023 last_is_slash = false; 5024 // Check if ch is Java identifier start or is Java identifier part 5025 // 4672820: call java.lang.Character methods directly without generating separate tables. 5026 EXCEPTION_MARK; 5027 // return value 5028 JavaValue result(T_BOOLEAN); 5029 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 5030 JavaCallArguments args; 5031 args.push_int(unicode_ch); 5032 5033 if (not_first_ch) { 5034 // public static boolean isJavaIdentifierPart(char ch); 5035 JavaCalls::call_static(&result, 5036 SystemDictionary::Character_klass(), 5037 vmSymbols::isJavaIdentifierPart_name(), 5038 vmSymbols::int_bool_signature(), 5039 &args, 5040 THREAD); 5041 } else { 5042 // public static boolean isJavaIdentifierStart(char ch); 5043 JavaCalls::call_static(&result, 5044 SystemDictionary::Character_klass(), 5045 vmSymbols::isJavaIdentifierStart_name(), 5046 vmSymbols::int_bool_signature(), 5047 &args, 5048 THREAD); 5049 } 5050 if (HAS_PENDING_EXCEPTION) { 5051 CLEAR_PENDING_EXCEPTION; 5052 return NULL; 5053 } 5054 if(result.get_jboolean()) { 5055 continue; 5056 } 5057 } 5058 return (not_first_ch) ? old_p : NULL; 5059 } 5060 return (not_first_ch) ? p : NULL; 5061 } 5062 5063 // Take pointer to a UTF8 byte string (not NUL-terminated). 5064 // Skip over the longest part of the string that could 5065 // be taken as a field signature. Allow "void" if void_ok. 5066 // Return a pointer to just past the signature. 5067 // Return NULL if no legal signature is found. 5068 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5069 bool void_ok, 5070 unsigned int length, 5071 TRAPS) const { 5072 unsigned int array_dim = 0; 5073 while (length > 0) { 5074 switch (signature[0]) { 5075 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5076 case JVM_SIGNATURE_BOOLEAN: 5077 case JVM_SIGNATURE_BYTE: 5078 case JVM_SIGNATURE_CHAR: 5079 case JVM_SIGNATURE_SHORT: 5080 case JVM_SIGNATURE_INT: 5081 case JVM_SIGNATURE_FLOAT: 5082 case JVM_SIGNATURE_LONG: 5083 case JVM_SIGNATURE_DOUBLE: 5084 return signature + 1; 5085 case JVM_SIGNATURE_CLASS: { 5086 if (_major_version < JAVA_1_5_VERSION) { 5087 // Skip over the class name if one is there 5088 const char* const p = skip_over_field_name(signature + 1, true, --length); 5089 5090 // The next character better be a semicolon 5091 if (p && (p - signature) > 1 && p[0] == ';') { 5092 return p + 1; 5093 } 5094 } 5095 else { 5096 // Skip leading 'L' and ignore first appearance of ';' 5097 signature++; 5098 const char* c = (const char*) memchr(signature, ';', length - 1); 5099 // Format check signature 5100 if (c != NULL) { 5101 int newlen = c - (char*) signature; 5102 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 5103 if (!legal) { 5104 classfile_parse_error("Class name contains illegal character " 5105 "in descriptor in class file %s", 5106 CHECK_0); 5107 return NULL; 5108 } 5109 return signature + newlen + 1; 5110 } 5111 } 5112 return NULL; 5113 } 5114 case JVM_SIGNATURE_ARRAY: 5115 array_dim++; 5116 if (array_dim > 255) { 5117 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5118 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5119 } 5120 // The rest of what's there better be a legal signature 5121 signature++; 5122 length--; 5123 void_ok = false; 5124 break; 5125 default: 5126 return NULL; 5127 } 5128 } 5129 return NULL; 5130 } 5131 5132 // Checks if name is a legal class name. 5133 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5134 if (!_need_verify || _relax_verify) { return; } 5135 5136 assert(name->refcount() > 0, "symbol must be kept alive"); 5137 char* bytes = (char*)name->bytes(); 5138 unsigned int length = name->utf8_length(); 5139 bool legal = false; 5140 5141 if (length > 0) { 5142 const char* p; 5143 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5144 p = skip_over_field_signature(bytes, false, length, CHECK); 5145 legal = (p != NULL) && ((p - bytes) == (int)length); 5146 } else if (_major_version < JAVA_1_5_VERSION) { 5147 if (bytes[0] != '<') { 5148 p = skip_over_field_name(bytes, true, length); 5149 legal = (p != NULL) && ((p - bytes) == (int)length); 5150 } 5151 } else { 5152 // 4900761: relax the constraints based on JSR202 spec 5153 // Class names may be drawn from the entire Unicode character set. 5154 // Identifiers between '/' must be unqualified names. 5155 // The utf8 string has been verified when parsing cpool entries. 5156 legal = verify_unqualified_name(bytes, length, LegalClass); 5157 } 5158 } 5159 if (!legal) { 5160 ResourceMark rm(THREAD); 5161 assert(_class_name != NULL, "invariant"); 5162 Exceptions::fthrow( 5163 THREAD_AND_LOCATION, 5164 vmSymbols::java_lang_ClassFormatError(), 5165 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5166 _class_name->as_C_string() 5167 ); 5168 return; 5169 } 5170 } 5171 5172 // Checks if name is a legal field name. 5173 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5174 if (!_need_verify || _relax_verify) { return; } 5175 5176 char* bytes = (char*)name->bytes(); 5177 unsigned int length = name->utf8_length(); 5178 bool legal = false; 5179 5180 if (length > 0) { 5181 if (_major_version < JAVA_1_5_VERSION) { 5182 if (bytes[0] != '<') { 5183 const char* p = skip_over_field_name(bytes, false, length); 5184 legal = (p != NULL) && ((p - bytes) == (int)length); 5185 } 5186 } else { 5187 // 4881221: relax the constraints based on JSR202 spec 5188 legal = verify_unqualified_name(bytes, length, LegalField); 5189 } 5190 } 5191 5192 if (!legal) { 5193 ResourceMark rm(THREAD); 5194 assert(_class_name != NULL, "invariant"); 5195 Exceptions::fthrow( 5196 THREAD_AND_LOCATION, 5197 vmSymbols::java_lang_ClassFormatError(), 5198 "Illegal field name \"%.*s\" in class %s", length, bytes, 5199 _class_name->as_C_string() 5200 ); 5201 return; 5202 } 5203 } 5204 5205 // Checks if name is a legal method name. 5206 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5207 if (!_need_verify || _relax_verify) { return; } 5208 5209 assert(name != NULL, "method name is null"); 5210 char* bytes = (char*)name->bytes(); 5211 unsigned int length = name->utf8_length(); 5212 bool legal = false; 5213 5214 if (length > 0) { 5215 if (bytes[0] == '<') { 5216 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5217 legal = true; 5218 } 5219 } else if (_major_version < JAVA_1_5_VERSION) { 5220 const char* p; 5221 p = skip_over_field_name(bytes, false, length); 5222 legal = (p != NULL) && ((p - bytes) == (int)length); 5223 } else { 5224 // 4881221: relax the constraints based on JSR202 spec 5225 legal = verify_unqualified_name(bytes, length, LegalMethod); 5226 } 5227 } 5228 5229 if (!legal) { 5230 ResourceMark rm(THREAD); 5231 assert(_class_name != NULL, "invariant"); 5232 Exceptions::fthrow( 5233 THREAD_AND_LOCATION, 5234 vmSymbols::java_lang_ClassFormatError(), 5235 "Illegal method name \"%.*s\" in class %s", length, bytes, 5236 _class_name->as_C_string() 5237 ); 5238 return; 5239 } 5240 } 5241 5242 5243 // Checks if signature is a legal field signature. 5244 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5245 const Symbol* signature, 5246 TRAPS) const { 5247 if (!_need_verify) { return; } 5248 5249 const char* const bytes = (const char* const)signature->bytes(); 5250 const unsigned int length = signature->utf8_length(); 5251 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5252 5253 if (p == NULL || (p - bytes) != (int)length) { 5254 throwIllegalSignature("Field", name, signature, CHECK); 5255 } 5256 } 5257 5258 // Checks if signature is a legal method signature. 5259 // Returns number of parameters 5260 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5261 const Symbol* signature, 5262 TRAPS) const { 5263 if (!_need_verify) { 5264 // make sure caller's args_size will be less than 0 even for non-static 5265 // method so it will be recomputed in compute_size_of_parameters(). 5266 return -2; 5267 } 5268 5269 // Class initializers cannot have args for class format version >= 51. 5270 if (name == vmSymbols::class_initializer_name() && 5271 signature != vmSymbols::void_method_signature() && 5272 _major_version >= JAVA_7_VERSION) { 5273 throwIllegalSignature("Method", name, signature, CHECK_0); 5274 return 0; 5275 } 5276 5277 unsigned int args_size = 0; 5278 const char* p = (const char*)signature->bytes(); 5279 unsigned int length = signature->utf8_length(); 5280 const char* nextp; 5281 5282 // The first character must be a '(' 5283 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5284 length--; 5285 // Skip over legal field signatures 5286 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5287 while ((length > 0) && (nextp != NULL)) { 5288 args_size++; 5289 if (p[0] == 'J' || p[0] == 'D') { 5290 args_size++; 5291 } 5292 length -= nextp - p; 5293 p = nextp; 5294 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5295 } 5296 // The first non-signature thing better be a ')' 5297 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5298 length--; 5299 if (name->utf8_length() > 0 && name->char_at(0) == '<') { 5300 // All internal methods must return void 5301 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5302 return args_size; 5303 } 5304 } else { 5305 // Now we better just have a return value 5306 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5307 if (nextp && ((int)length == (nextp - p))) { 5308 return args_size; 5309 } 5310 } 5311 } 5312 } 5313 // Report error 5314 throwIllegalSignature("Method", name, signature, CHECK_0); 5315 return 0; 5316 } 5317 5318 int ClassFileParser::static_field_size() const { 5319 assert(_field_info != NULL, "invariant"); 5320 return _field_info->static_field_size; 5321 } 5322 5323 int ClassFileParser::total_oop_map_count() const { 5324 assert(_field_info != NULL, "invariant"); 5325 return _field_info->total_oop_map_count; 5326 } 5327 5328 jint ClassFileParser::layout_size() const { 5329 assert(_field_info != NULL, "invariant"); 5330 return _field_info->instance_size; 5331 } 5332 5333 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5334 const Array<Method*>* methods) { 5335 assert(ik != NULL, "invariant"); 5336 assert(methods != NULL, "invariant"); 5337 5338 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5339 // (We used to do this lazily, but now we query it in Rewriter, 5340 // which is eagerly done for every method, so we might as well do it now, 5341 // when everything is fresh in memory.) 5342 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5343 5344 if (klass_id != vmSymbols::NO_SID) { 5345 for (int j = 0; j < methods->length(); ++j) { 5346 Method* method = methods->at(j); 5347 method->init_intrinsic_id(); 5348 5349 if (CheckIntrinsics) { 5350 // Check if an intrinsic is defined for method 'method', 5351 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5352 if (method->intrinsic_id() != vmIntrinsics::_none && 5353 !method->intrinsic_candidate()) { 5354 tty->print("Compiler intrinsic is defined for method [%s], " 5355 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5356 method->name_and_sig_as_C_string(), 5357 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5358 ); 5359 tty->cr(); 5360 DEBUG_ONLY(vm_exit(1)); 5361 } 5362 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5363 // but there is no intrinsic available for it. 5364 if (method->intrinsic_candidate() && 5365 method->intrinsic_id() == vmIntrinsics::_none) { 5366 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5367 "but no compiler intrinsic is defined for the method.%s", 5368 method->name_and_sig_as_C_string(), 5369 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5370 ); 5371 tty->cr(); 5372 DEBUG_ONLY(vm_exit(1)); 5373 } 5374 } 5375 } // end for 5376 5377 #ifdef ASSERT 5378 if (CheckIntrinsics) { 5379 // Check for orphan methods in the current class. A method m 5380 // of a class C is orphan if an intrinsic is defined for method m, 5381 // but class C does not declare m. 5382 // The check is potentially expensive, therefore it is available 5383 // only in debug builds. 5384 5385 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5386 if (vmIntrinsics::_compiledLambdaForm == id) { 5387 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5388 // generated for the JVM from a LambdaForm and therefore no method 5389 // is defined for it. 5390 continue; 5391 } 5392 5393 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5394 // Check if the current class contains a method with the same 5395 // name, flags, signature. 5396 bool match = false; 5397 for (int j = 0; j < methods->length(); ++j) { 5398 const Method* method = methods->at(j); 5399 if (method->intrinsic_id() == id) { 5400 match = true; 5401 break; 5402 } 5403 } 5404 5405 if (!match) { 5406 char buf[1000]; 5407 tty->print("Compiler intrinsic is defined for method [%s], " 5408 "but the method is not available in class [%s].%s", 5409 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5410 buf, sizeof(buf)), 5411 ik->name()->as_C_string(), 5412 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5413 ); 5414 tty->cr(); 5415 DEBUG_ONLY(vm_exit(1)); 5416 } 5417 } 5418 } // end for 5419 } // CheckIntrinsics 5420 #endif // ASSERT 5421 } 5422 } 5423 5424 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5425 if (_klass != NULL) { 5426 return _klass; 5427 } 5428 5429 InstanceKlass* const ik = 5430 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5431 5432 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5433 5434 assert(_klass == ik, "invariant"); 5435 5436 5437 if (ik->should_store_fingerprint()) { 5438 ik->store_fingerprint(_stream->compute_fingerprint()); 5439 } 5440 5441 ik->set_has_passed_fingerprint_check(false); 5442 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5443 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5444 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint(); 5445 if (aot_fp != 0 && aot_fp == fp) { 5446 // This class matches with a class saved in an AOT library 5447 ik->set_has_passed_fingerprint_check(true); 5448 } else { 5449 ResourceMark rm; 5450 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5451 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5452 } 5453 } 5454 5455 return ik; 5456 } 5457 5458 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5459 assert(ik != NULL, "invariant"); 5460 5461 // Set name and CLD before adding to CLD 5462 ik->set_class_loader_data(_loader_data); 5463 ik->set_name(_class_name); 5464 5465 // Add all classes to our internal class loader list here, 5466 // including classes in the bootstrap (NULL) class loader. 5467 const bool publicize = !is_internal(); 5468 5469 _loader_data->add_class(ik, publicize); 5470 5471 set_klass_to_deallocate(ik); 5472 5473 assert(_field_info != NULL, "invariant"); 5474 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5475 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count, 5476 "sanity"); 5477 5478 assert(ik->is_instance_klass(), "sanity"); 5479 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5480 5481 // Fill in information already parsed 5482 ik->set_should_verify_class(_need_verify); 5483 5484 // Not yet: supers are done below to support the new subtype-checking fields 5485 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5486 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5487 assert(_fac != NULL, "invariant"); 5488 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]); 5489 5490 // this transfers ownership of a lot of arrays from 5491 // the parser onto the InstanceKlass* 5492 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5493 5494 // note that is not safe to use the fields in the parser from this point on 5495 assert(NULL == _cp, "invariant"); 5496 assert(NULL == _fields, "invariant"); 5497 assert(NULL == _methods, "invariant"); 5498 assert(NULL == _inner_classes, "invariant"); 5499 assert(NULL == _nest_members, "invariant"); 5500 assert(NULL == _local_interfaces, "invariant"); 5501 assert(NULL == _combined_annotations, "invariant"); 5502 5503 if (_has_final_method) { 5504 ik->set_has_final_method(); 5505 } 5506 5507 ik->copy_method_ordering(_method_ordering, CHECK); 5508 // The InstanceKlass::_methods_jmethod_ids cache 5509 // is managed on the assumption that the initial cache 5510 // size is equal to the number of methods in the class. If 5511 // that changes, then InstanceKlass::idnum_can_increment() 5512 // has to be changed accordingly. 5513 ik->set_initial_method_idnum(ik->methods()->length()); 5514 5515 ik->set_this_class_index(_this_class_index); 5516 5517 if (is_unsafe_anonymous()) { 5518 // _this_class_index is a CONSTANT_Class entry that refers to this 5519 // anonymous class itself. If this class needs to refer to its own methods or 5520 // fields, it would use a CONSTANT_MethodRef, etc, which would reference 5521 // _this_class_index. However, because this class is anonymous (it's 5522 // not stored in SystemDictionary), _this_class_index cannot be resolved 5523 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5524 // Therefore, we must eagerly resolve _this_class_index now. 5525 ik->constants()->klass_at_put(_this_class_index, ik); 5526 } 5527 5528 ik->set_minor_version(_minor_version); 5529 ik->set_major_version(_major_version); 5530 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5531 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5532 5533 if (_unsafe_anonymous_host != NULL) { 5534 assert (ik->is_unsafe_anonymous(), "should be the same"); 5535 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host); 5536 } 5537 5538 // Set PackageEntry for this_klass 5539 oop cl = ik->class_loader(); 5540 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5541 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5542 ik->set_package(cld, CHECK); 5543 5544 const Array<Method*>* const methods = ik->methods(); 5545 assert(methods != NULL, "invariant"); 5546 const int methods_len = methods->length(); 5547 5548 check_methods_for_intrinsics(ik, methods); 5549 5550 // Fill in field values obtained by parse_classfile_attributes 5551 if (_parsed_annotations->has_any_annotations()) { 5552 _parsed_annotations->apply_to(ik); 5553 } 5554 5555 apply_parsed_class_attributes(ik); 5556 5557 // Miranda methods 5558 if ((_num_miranda_methods > 0) || 5559 // if this class introduced new miranda methods or 5560 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5561 // super class exists and this class inherited miranda methods 5562 ) { 5563 ik->set_has_miranda_methods(); // then set a flag 5564 } 5565 5566 // Fill in information needed to compute superclasses. 5567 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5568 ik->set_transitive_interfaces(_transitive_interfaces); 5569 _transitive_interfaces = NULL; 5570 5571 // Initialize itable offset tables 5572 klassItable::setup_itable_offset_table(ik); 5573 5574 // Compute transitive closure of interfaces this class implements 5575 // Do final class setup 5576 fill_oop_maps(ik, 5577 _field_info->nonstatic_oop_map_count, 5578 _field_info->nonstatic_oop_offsets, 5579 _field_info->nonstatic_oop_counts); 5580 5581 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5582 set_precomputed_flags(ik); 5583 5584 // check if this class can access its super class 5585 check_super_class_access(ik, CHECK); 5586 5587 // check if this class can access its superinterfaces 5588 check_super_interface_access(ik, CHECK); 5589 5590 // check if this class overrides any final method 5591 check_final_method_override(ik, CHECK); 5592 5593 // reject static interface methods prior to Java 8 5594 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5595 check_illegal_static_method(ik, CHECK); 5596 } 5597 5598 // Obtain this_klass' module entry 5599 ModuleEntry* module_entry = ik->module(); 5600 assert(module_entry != NULL, "module_entry should always be set"); 5601 5602 // Obtain java.lang.Module 5603 Handle module_handle(THREAD, module_entry->module()); 5604 5605 // Allocate mirror and initialize static fields 5606 // The create_mirror() call will also call compute_modifiers() 5607 java_lang_Class::create_mirror(ik, 5608 Handle(THREAD, _loader_data->class_loader()), 5609 module_handle, 5610 _protection_domain, 5611 CHECK); 5612 5613 assert(_all_mirandas != NULL, "invariant"); 5614 5615 // Generate any default methods - default methods are public interface methods 5616 // that have a default implementation. This is new with Java 8. 5617 if (_has_nonstatic_concrete_methods) { 5618 DefaultMethods::generate_default_methods(ik, 5619 _all_mirandas, 5620 CHECK); 5621 } 5622 5623 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5624 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5625 !module_entry->has_default_read_edges()) { 5626 if (!module_entry->set_has_default_read_edges()) { 5627 // We won a potential race 5628 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5629 } 5630 } 5631 5632 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5633 5634 if (!is_internal()) { 5635 if (log_is_enabled(Info, class, load)) { 5636 ResourceMark rm; 5637 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5638 ik->print_class_load_logging(_loader_data, module_name, _stream); 5639 } 5640 5641 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5642 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION && 5643 log_is_enabled(Info, class, preview)) { 5644 ResourceMark rm; 5645 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5646 ik->external_name(), ik->major_version()); 5647 } 5648 5649 if (log_is_enabled(Debug, class, resolve)) { 5650 ResourceMark rm; 5651 // print out the superclass. 5652 const char * from = ik->external_name(); 5653 if (ik->java_super() != NULL) { 5654 log_debug(class, resolve)("%s %s (super)", 5655 from, 5656 ik->java_super()->external_name()); 5657 } 5658 // print out each of the interface classes referred to by this class. 5659 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5660 if (local_interfaces != NULL) { 5661 const int length = local_interfaces->length(); 5662 for (int i = 0; i < length; i++) { 5663 const InstanceKlass* const k = local_interfaces->at(i); 5664 const char * to = k->external_name(); 5665 log_debug(class, resolve)("%s %s (interface)", from, to); 5666 } 5667 } 5668 } 5669 } 5670 5671 JFR_ONLY(INIT_ID(ik);) 5672 5673 // If we reach here, all is well. 5674 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5675 // in order for it to not be destroyed in the ClassFileParser destructor. 5676 set_klass_to_deallocate(NULL); 5677 5678 // it's official 5679 set_klass(ik); 5680 5681 debug_only(ik->verify();) 5682 } 5683 5684 void ClassFileParser::update_class_name(Symbol* new_class_name) { 5685 // Decrement the refcount in the old name, since we're clobbering it. 5686 _class_name->decrement_refcount(); 5687 5688 _class_name = new_class_name; 5689 // Increment the refcount of the new name. 5690 // Now the ClassFileParser owns this name and will decrement in 5691 // the destructor. 5692 _class_name->increment_refcount(); 5693 } 5694 5695 5696 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's 5697 // package by prepending its host class's package name to its class name and setting 5698 // its _class_name field. 5699 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) { 5700 ResourceMark rm(THREAD); 5701 assert(strrchr(_class_name->as_C_string(), '/') == NULL, 5702 "Unsafe anonymous class should not be in a package"); 5703 const char* host_pkg_name = 5704 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL); 5705 5706 if (host_pkg_name != NULL) { 5707 int host_pkg_len = (int)strlen(host_pkg_name); 5708 int class_name_len = _class_name->utf8_length(); 5709 int symbol_len = host_pkg_len + 1 + class_name_len; 5710 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1); 5711 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s", 5712 host_pkg_name, class_name_len, _class_name->base()); 5713 assert(n == symbol_len, "Unexpected number of characters in string"); 5714 5715 // Decrement old _class_name to avoid leaking. 5716 _class_name->decrement_refcount(); 5717 5718 // Create a symbol and update the anonymous class name. 5719 // The new class name is created with a refcount of one. When installed into the InstanceKlass, 5720 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted 5721 // when the class is unloaded. 5722 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len, CHECK); 5723 } 5724 } 5725 5726 // If the host class and the anonymous class are in the same package then do 5727 // nothing. If the anonymous class is in the unnamed package then move it to its 5728 // host's package. If the classes are in different packages then throw an IAE 5729 // exception. 5730 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) { 5731 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class"); 5732 5733 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(), 5734 _class_name->utf8_length(), '/'); 5735 if (anon_last_slash == NULL) { // Unnamed package 5736 prepend_host_package_name(_unsafe_anonymous_host, CHECK); 5737 } else { 5738 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) { 5739 ResourceMark rm(THREAD); 5740 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5741 err_msg("Host class %s and anonymous class %s are in different packages", 5742 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string())); 5743 } 5744 } 5745 } 5746 5747 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5748 bool trusted = (loader_data->is_the_null_class_loader_data() || 5749 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 5750 bool need_verify = 5751 // verifyAll 5752 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5753 // verifyRemote 5754 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5755 return !need_verify; 5756 } 5757 5758 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5759 Symbol* name, 5760 ClassLoaderData* loader_data, 5761 Handle protection_domain, 5762 const InstanceKlass* unsafe_anonymous_host, 5763 GrowableArray<Handle>* cp_patches, 5764 Publicity pub_level, 5765 TRAPS) : 5766 _stream(stream), 5767 _requested_name(name), 5768 _class_name(NULL), 5769 _loader_data(loader_data), 5770 _unsafe_anonymous_host(unsafe_anonymous_host), 5771 _cp_patches(cp_patches), 5772 _num_patched_klasses(0), 5773 _max_num_patched_klasses(0), 5774 _orig_cp_size(0), 5775 _first_patched_klass_resolved_index(0), 5776 _super_klass(), 5777 _cp(NULL), 5778 _fields(NULL), 5779 _methods(NULL), 5780 _inner_classes(NULL), 5781 _nest_members(NULL), 5782 _nest_host(0), 5783 _local_interfaces(NULL), 5784 _transitive_interfaces(NULL), 5785 _combined_annotations(NULL), 5786 _annotations(NULL), 5787 _type_annotations(NULL), 5788 _fields_annotations(NULL), 5789 _fields_type_annotations(NULL), 5790 _klass(NULL), 5791 _klass_to_deallocate(NULL), 5792 _parsed_annotations(NULL), 5793 _fac(NULL), 5794 _field_info(NULL), 5795 _method_ordering(NULL), 5796 _all_mirandas(NULL), 5797 _vtable_size(0), 5798 _itable_size(0), 5799 _num_miranda_methods(0), 5800 _rt(REF_NONE), 5801 _protection_domain(protection_domain), 5802 _access_flags(), 5803 _pub_level(pub_level), 5804 _bad_constant_seen(0), 5805 _synthetic_flag(false), 5806 _sde_length(false), 5807 _sde_buffer(NULL), 5808 _sourcefile_index(0), 5809 _generic_signature_index(0), 5810 _major_version(0), 5811 _minor_version(0), 5812 _this_class_index(0), 5813 _super_class_index(0), 5814 _itfs_len(0), 5815 _java_fields_count(0), 5816 _need_verify(false), 5817 _relax_verify(false), 5818 _has_nonstatic_concrete_methods(false), 5819 _declares_nonstatic_concrete_methods(false), 5820 _has_final_method(false), 5821 _has_finalizer(false), 5822 _has_empty_finalizer(false), 5823 _has_vanilla_constructor(false), 5824 _max_bootstrap_specifier_index(-1) { 5825 5826 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 5827 _class_name->increment_refcount(); 5828 5829 assert(THREAD->is_Java_thread(), "invariant"); 5830 assert(_loader_data != NULL, "invariant"); 5831 assert(stream != NULL, "invariant"); 5832 assert(_stream != NULL, "invariant"); 5833 assert(_stream->buffer() == _stream->current(), "invariant"); 5834 assert(_class_name != NULL, "invariant"); 5835 assert(0 == _access_flags.as_int(), "invariant"); 5836 5837 // Figure out whether we can skip format checking (matching classic VM behavior) 5838 if (DumpSharedSpaces) { 5839 // verify == true means it's a 'remote' class (i.e., non-boot class) 5840 // Verification decision is based on BytecodeVerificationRemote flag 5841 // for those classes. 5842 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 5843 BytecodeVerificationLocal; 5844 } 5845 else { 5846 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 5847 stream->need_verify()); 5848 } 5849 if (_cp_patches != NULL) { 5850 int len = _cp_patches->length(); 5851 for (int i=0; i<len; i++) { 5852 if (has_cp_patch_at(i)) { 5853 Handle patch = cp_patch_at(i); 5854 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 5855 // We need to append the names of the patched classes to the end of the constant pool, 5856 // because a patched class may have a Utf8 name that's not already included in the 5857 // original constant pool. These class names are used when patch_constant_pool() 5858 // calls patch_class(). 5859 // 5860 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 5861 // At this point, we don't know the tag for index i yet, because we haven't parsed the 5862 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 5863 _max_num_patched_klasses++; 5864 } 5865 } 5866 } 5867 } 5868 5869 // synch back verification state to stream 5870 stream->set_verify(_need_verify); 5871 5872 // Check if verification needs to be relaxed for this class file 5873 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 5874 _relax_verify = relax_format_check_for(_loader_data); 5875 5876 parse_stream(stream, CHECK); 5877 5878 post_process_parsed_stream(stream, _cp, CHECK); 5879 } 5880 5881 void ClassFileParser::clear_class_metadata() { 5882 // metadata created before the instance klass is created. Must be 5883 // deallocated if classfile parsing returns an error. 5884 _cp = NULL; 5885 _fields = NULL; 5886 _methods = NULL; 5887 _inner_classes = NULL; 5888 _nest_members = NULL; 5889 _local_interfaces = NULL; 5890 _combined_annotations = NULL; 5891 _annotations = _type_annotations = NULL; 5892 _fields_annotations = _fields_type_annotations = NULL; 5893 } 5894 5895 // Destructor to clean up 5896 ClassFileParser::~ClassFileParser() { 5897 _class_name->decrement_refcount(); 5898 5899 if (_cp != NULL) { 5900 MetadataFactory::free_metadata(_loader_data, _cp); 5901 } 5902 if (_fields != NULL) { 5903 MetadataFactory::free_array<u2>(_loader_data, _fields); 5904 } 5905 5906 if (_methods != NULL) { 5907 // Free methods 5908 InstanceKlass::deallocate_methods(_loader_data, _methods); 5909 } 5910 5911 // beware of the Universe::empty_blah_array!! 5912 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 5913 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 5914 } 5915 5916 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) { 5917 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 5918 } 5919 5920 // Free interfaces 5921 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 5922 _local_interfaces, _transitive_interfaces); 5923 5924 if (_combined_annotations != NULL) { 5925 // After all annotations arrays have been created, they are installed into the 5926 // Annotations object that will be assigned to the InstanceKlass being created. 5927 5928 // Deallocate the Annotations object and the installed annotations arrays. 5929 _combined_annotations->deallocate_contents(_loader_data); 5930 5931 // If the _combined_annotations pointer is non-NULL, 5932 // then the other annotations fields should have been cleared. 5933 assert(_annotations == NULL, "Should have been cleared"); 5934 assert(_type_annotations == NULL, "Should have been cleared"); 5935 assert(_fields_annotations == NULL, "Should have been cleared"); 5936 assert(_fields_type_annotations == NULL, "Should have been cleared"); 5937 } else { 5938 // If the annotations arrays were not installed into the Annotations object, 5939 // then they have to be deallocated explicitly. 5940 MetadataFactory::free_array<u1>(_loader_data, _annotations); 5941 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 5942 Annotations::free_contents(_loader_data, _fields_annotations); 5943 Annotations::free_contents(_loader_data, _fields_type_annotations); 5944 } 5945 5946 clear_class_metadata(); 5947 _transitive_interfaces = NULL; 5948 5949 // deallocate the klass if already created. Don't directly deallocate, but add 5950 // to the deallocate list so that the klass is removed from the CLD::_klasses list 5951 // at a safepoint. 5952 if (_klass_to_deallocate != NULL) { 5953 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 5954 } 5955 } 5956 5957 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 5958 TRAPS) { 5959 5960 assert(stream != NULL, "invariant"); 5961 assert(_class_name != NULL, "invariant"); 5962 5963 // BEGIN STREAM PARSING 5964 stream->guarantee_more(8, CHECK); // magic, major, minor 5965 // Magic value 5966 const u4 magic = stream->get_u4_fast(); 5967 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 5968 "Incompatible magic value %u in class file %s", 5969 magic, CHECK); 5970 5971 // Version numbers 5972 _minor_version = stream->get_u2_fast(); 5973 _major_version = stream->get_u2_fast(); 5974 5975 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) { 5976 ResourceMark rm; 5977 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 5978 _major_version, _minor_version, _class_name->as_C_string()); 5979 Exceptions::fthrow( 5980 THREAD_AND_LOCATION, 5981 vmSymbols::java_lang_UnsupportedClassVersionError(), 5982 "Unsupported major.minor version for dump time %u.%u", 5983 _major_version, 5984 _minor_version); 5985 } 5986 5987 // Check version numbers - we check this even with verifier off 5988 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 5989 5990 stream->guarantee_more(3, CHECK); // length, first cp tag 5991 u2 cp_size = stream->get_u2_fast(); 5992 5993 guarantee_property( 5994 cp_size >= 1, "Illegal constant pool size %u in class file %s", 5995 cp_size, CHECK); 5996 5997 _orig_cp_size = cp_size; 5998 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 5999 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 6000 } 6001 cp_size += _max_num_patched_klasses; 6002 6003 _cp = ConstantPool::allocate(_loader_data, 6004 cp_size, 6005 CHECK); 6006 6007 ConstantPool* const cp = _cp; 6008 6009 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6010 6011 assert(cp_size == (const u2)cp->length(), "invariant"); 6012 6013 // ACCESS FLAGS 6014 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6015 6016 // Access flags 6017 jint flags; 6018 // JVM_ACC_MODULE is defined in JDK-9 and later. 6019 if (_major_version >= JAVA_9_VERSION) { 6020 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 6021 } else { 6022 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 6023 } 6024 6025 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6026 // Set abstract bit for old class files for backward compatibility 6027 flags |= JVM_ACC_ABSTRACT; 6028 } 6029 6030 verify_legal_class_modifiers(flags, CHECK); 6031 6032 short bad_constant = class_bad_constant_seen(); 6033 if (bad_constant != 0) { 6034 // Do not throw CFE until after the access_flags are checked because if 6035 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6036 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 6037 } 6038 6039 _access_flags.set_flags(flags); 6040 6041 // This class and superclass 6042 _this_class_index = stream->get_u2_fast(); 6043 check_property( 6044 valid_cp_range(_this_class_index, cp_size) && 6045 cp->tag_at(_this_class_index).is_unresolved_klass(), 6046 "Invalid this class index %u in constant pool in class file %s", 6047 _this_class_index, CHECK); 6048 6049 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6050 assert(class_name_in_cp != NULL, "class_name can't be null"); 6051 6052 // Update _class_name to reflect the name in the constant pool 6053 update_class_name(class_name_in_cp); 6054 6055 // Don't need to check whether this class name is legal or not. 6056 // It has been checked when constant pool is parsed. 6057 // However, make sure it is not an array type. 6058 if (_need_verify) { 6059 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY, 6060 "Bad class name in class file %s", 6061 CHECK); 6062 } 6063 6064 // Checks if name in class file matches requested name 6065 if (_requested_name != NULL && _requested_name != _class_name) { 6066 ResourceMark rm(THREAD); 6067 Exceptions::fthrow( 6068 THREAD_AND_LOCATION, 6069 vmSymbols::java_lang_NoClassDefFoundError(), 6070 "%s (wrong name: %s)", 6071 _class_name->as_C_string(), 6072 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 6073 ); 6074 return; 6075 } 6076 6077 // if this is an anonymous class fix up its name if it's in the unnamed 6078 // package. Otherwise, throw IAE if it is in a different package than 6079 // its host class. 6080 if (_unsafe_anonymous_host != NULL) { 6081 fix_unsafe_anonymous_class_name(CHECK); 6082 } 6083 6084 // Verification prevents us from creating names with dots in them, this 6085 // asserts that that's the case. 6086 assert(is_internal_format(_class_name), "external class name format used internally"); 6087 6088 if (!is_internal()) { 6089 LogTarget(Debug, class, preorder) lt; 6090 if (lt.is_enabled()){ 6091 ResourceMark rm(THREAD); 6092 LogStream ls(lt); 6093 ls.print("%s", _class_name->as_klass_external_name()); 6094 if (stream->source() != NULL) { 6095 ls.print(" source: %s", stream->source()); 6096 } 6097 ls.cr(); 6098 } 6099 6100 #if INCLUDE_CDS 6101 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6102 if (!ClassLoader::has_jrt_entry()) { 6103 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6104 DumpLoadedClassList = NULL; 6105 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6106 _unsafe_anonymous_host == NULL) { 6107 // Only dump the classes that can be stored into CDS archive. 6108 // Unsafe anonymous classes such as generated LambdaForm classes are also not included. 6109 oop class_loader = _loader_data->class_loader(); 6110 ResourceMark rm(THREAD); 6111 bool skip = false; 6112 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6113 // For the boot and platform class loaders, skip classes that are not found in the 6114 // java runtime image, such as those found in the --patch-module entries. 6115 // These classes can't be loaded from the archive during runtime. 6116 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) { 6117 skip = true; 6118 } 6119 6120 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6121 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6122 // as they can be loaded from the archive during runtime. 6123 skip = false; 6124 } 6125 } 6126 if (skip) { 6127 tty->print_cr("skip writing class %s from source %s to classlist file", 6128 _class_name->as_C_string(), stream->source()); 6129 } else { 6130 classlist_file->print_cr("%s", _class_name->as_C_string()); 6131 classlist_file->flush(); 6132 } 6133 } 6134 } 6135 #endif 6136 } 6137 6138 // SUPERKLASS 6139 _super_class_index = stream->get_u2_fast(); 6140 _super_klass = parse_super_class(cp, 6141 _super_class_index, 6142 _need_verify, 6143 CHECK); 6144 6145 // Interfaces 6146 _itfs_len = stream->get_u2_fast(); 6147 parse_interfaces(stream, 6148 _itfs_len, 6149 cp, 6150 &_has_nonstatic_concrete_methods, 6151 CHECK); 6152 6153 assert(_local_interfaces != NULL, "invariant"); 6154 6155 // Fields (offsets are filled in later) 6156 _fac = new FieldAllocationCount(); 6157 parse_fields(stream, 6158 _access_flags.is_interface(), 6159 _fac, 6160 cp, 6161 cp_size, 6162 &_java_fields_count, 6163 CHECK); 6164 6165 assert(_fields != NULL, "invariant"); 6166 6167 // Methods 6168 AccessFlags promoted_flags; 6169 parse_methods(stream, 6170 _access_flags.is_interface(), 6171 &promoted_flags, 6172 &_has_final_method, 6173 &_declares_nonstatic_concrete_methods, 6174 CHECK); 6175 6176 assert(_methods != NULL, "invariant"); 6177 6178 // promote flags from parse_methods() to the klass' flags 6179 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6180 6181 if (_declares_nonstatic_concrete_methods) { 6182 _has_nonstatic_concrete_methods = true; 6183 } 6184 6185 // Additional attributes/annotations 6186 _parsed_annotations = new ClassAnnotationCollector(); 6187 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6188 6189 assert(_inner_classes != NULL, "invariant"); 6190 6191 // Finalize the Annotations metadata object, 6192 // now that all annotation arrays have been created. 6193 create_combined_annotations(CHECK); 6194 6195 // Make sure this is the end of class file stream 6196 guarantee_property(stream->at_eos(), 6197 "Extra bytes at the end of class file %s", 6198 CHECK); 6199 6200 // all bytes in stream read and parsed 6201 } 6202 6203 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6204 ConstantPool* cp, 6205 TRAPS) { 6206 assert(stream != NULL, "invariant"); 6207 assert(stream->at_eos(), "invariant"); 6208 assert(cp != NULL, "invariant"); 6209 assert(_loader_data != NULL, "invariant"); 6210 6211 if (_class_name == vmSymbols::java_lang_Object()) { 6212 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6213 "java.lang.Object cannot implement an interface in class file %s", 6214 CHECK); 6215 } 6216 // We check super class after class file is parsed and format is checked 6217 if (_super_class_index > 0 && NULL ==_super_klass) { 6218 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6219 if (_access_flags.is_interface()) { 6220 // Before attempting to resolve the superclass, check for class format 6221 // errors not checked yet. 6222 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6223 "Interfaces must have java.lang.Object as superclass in class file %s", 6224 CHECK); 6225 } 6226 Handle loader(THREAD, _loader_data->class_loader()); 6227 _super_klass = (const InstanceKlass*) 6228 SystemDictionary::resolve_super_or_fail(_class_name, 6229 super_class_name, 6230 loader, 6231 _protection_domain, 6232 true, 6233 CHECK); 6234 } 6235 6236 if (_super_klass != NULL) { 6237 if (_super_klass->has_nonstatic_concrete_methods()) { 6238 _has_nonstatic_concrete_methods = true; 6239 } 6240 6241 if (_super_klass->is_interface()) { 6242 ResourceMark rm(THREAD); 6243 Exceptions::fthrow( 6244 THREAD_AND_LOCATION, 6245 vmSymbols::java_lang_IncompatibleClassChangeError(), 6246 "class %s has interface %s as super class", 6247 _class_name->as_klass_external_name(), 6248 _super_klass->external_name() 6249 ); 6250 return; 6251 } 6252 // Make sure super class is not final 6253 if (_super_klass->is_final()) { 6254 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6255 } 6256 } 6257 6258 // Compute the transitive list of all unique interfaces implemented by this class 6259 _transitive_interfaces = 6260 compute_transitive_interfaces(_super_klass, 6261 _local_interfaces, 6262 _loader_data, 6263 CHECK); 6264 6265 assert(_transitive_interfaces != NULL, "invariant"); 6266 6267 // sort methods 6268 _method_ordering = sort_methods(_methods); 6269 6270 _all_mirandas = new GrowableArray<Method*>(20); 6271 6272 Handle loader(THREAD, _loader_data->class_loader()); 6273 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6274 &_num_miranda_methods, 6275 _all_mirandas, 6276 _super_klass, 6277 _methods, 6278 _access_flags, 6279 _major_version, 6280 loader, 6281 _class_name, 6282 _local_interfaces, 6283 CHECK); 6284 6285 // Size of Java itable (in words) 6286 _itable_size = _access_flags.is_interface() ? 0 : 6287 klassItable::compute_itable_size(_transitive_interfaces); 6288 6289 assert(_fac != NULL, "invariant"); 6290 assert(_parsed_annotations != NULL, "invariant"); 6291 6292 _field_info = new FieldLayoutInfo(); 6293 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6294 6295 // Compute reference typ 6296 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6297 6298 } 6299 6300 void ClassFileParser::set_klass(InstanceKlass* klass) { 6301 6302 #ifdef ASSERT 6303 if (klass != NULL) { 6304 assert(NULL == _klass, "leaking?"); 6305 } 6306 #endif 6307 6308 _klass = klass; 6309 } 6310 6311 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6312 6313 #ifdef ASSERT 6314 if (klass != NULL) { 6315 assert(NULL == _klass_to_deallocate, "leaking?"); 6316 } 6317 #endif 6318 6319 _klass_to_deallocate = klass; 6320 } 6321 6322 // Caller responsible for ResourceMark 6323 // clone stream with rewound position 6324 const ClassFileStream* ClassFileParser::clone_stream() const { 6325 assert(_stream != NULL, "invariant"); 6326 6327 return _stream->clone(); 6328 } 6329 // ---------------------------------------------------------------------------- 6330 // debugging 6331 6332 #ifdef ASSERT 6333 6334 // return true if class_name contains no '.' (internal format is '/') 6335 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6336 if (class_name != NULL) { 6337 ResourceMark rm; 6338 char* name = class_name->as_C_string(); 6339 return strchr(name, '.') == NULL; 6340 } else { 6341 return true; 6342 } 6343 } 6344 6345 #endif