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/packageEntry.hpp" 36 #include "classfile/symbolTable.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/verificationType.hpp" 39 #include "classfile/verifier.hpp" 40 #include "classfile/vmSymbols.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.hpp" 44 #include "memory/metadataFactory.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "memory/universe.hpp" 48 #include "oops/annotations.hpp" 49 #include "oops/constantPool.inline.hpp" 50 #include "oops/fieldStreams.hpp" 51 #include "oops/instanceKlass.hpp" 52 #include "oops/instanceMirrorKlass.hpp" 53 #include "oops/klass.inline.hpp" 54 #include "oops/klassVtable.hpp" 55 #include "oops/metadata.hpp" 56 #include "oops/method.inline.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/symbol.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "runtime/arguments.hpp" 62 #include "runtime/handles.inline.hpp" 63 #include "runtime/javaCalls.hpp" 64 #include "runtime/os.hpp" 65 #include "runtime/perfData.hpp" 66 #include "runtime/reflection.hpp" 67 #include "runtime/safepointVerifiers.hpp" 68 #include "runtime/signature.hpp" 69 #include "runtime/timer.hpp" 70 #include "services/classLoadingService.hpp" 71 #include "services/threadService.hpp" 72 #include "utilities/align.hpp" 73 #include "utilities/bitMap.inline.hpp" 74 #include "utilities/copy.hpp" 75 #include "utilities/exceptions.hpp" 76 #include "utilities/globalDefinitions.hpp" 77 #include "utilities/growableArray.hpp" 78 #include "utilities/macros.hpp" 79 #include "utilities/ostream.hpp" 80 #include "utilities/resourceHash.hpp" 81 #include "utilities/utf8.hpp" 82 83 #if INCLUDE_CDS 84 #include "classfile/systemDictionaryShared.hpp" 85 #endif 86 #if INCLUDE_JFR 87 #include "jfr/support/jfrTraceIdExtension.hpp" 88 #endif 89 90 // We generally try to create the oops directly when parsing, rather than 91 // allocating temporary data structures and copying the bytes twice. A 92 // temporary area is only needed when parsing utf8 entries in the constant 93 // pool and when parsing line number tables. 94 95 // We add assert in debug mode when class format is not checked. 96 97 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 98 #define JAVA_MIN_SUPPORTED_VERSION 45 99 #define JAVA_PREVIEW_MINOR_VERSION 65535 100 101 // Used for two backward compatibility reasons: 102 // - to check for new additions to the class file format in JDK1.5 103 // - to check for bug fixes in the format checker in JDK1.5 104 #define JAVA_1_5_VERSION 49 105 106 // Used for backward compatibility reasons: 107 // - to check for javac bug fixes that happened after 1.5 108 // - also used as the max version when running in jdk6 109 #define JAVA_6_VERSION 50 110 111 // Used for backward compatibility reasons: 112 // - to disallow argument and require ACC_STATIC for <clinit> methods 113 #define JAVA_7_VERSION 51 114 115 // Extension method support. 116 #define JAVA_8_VERSION 52 117 118 #define JAVA_9_VERSION 53 119 120 #define JAVA_10_VERSION 54 121 122 #define JAVA_11_VERSION 55 123 124 #define JAVA_12_VERSION 56 125 126 #define JAVA_13_VERSION 57 127 128 #define JAVA_14_VERSION 58 129 130 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 131 assert((bad_constant == JVM_CONSTANT_Module || 132 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION, 133 "Unexpected bad constant pool entry"); 134 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 135 } 136 137 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 138 ConstantPool* cp, 139 const int length, 140 TRAPS) { 141 assert(stream != NULL, "invariant"); 142 assert(cp != NULL, "invariant"); 143 144 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 145 // this function (_current can be allocated in a register, with scalar 146 // replacement of aggregates). The _current pointer is copied back to 147 // stream() when this function returns. DON'T call another method within 148 // this method that uses stream(). 149 const ClassFileStream cfs1 = *stream; 150 const ClassFileStream* const cfs = &cfs1; 151 152 assert(cfs->allocated_on_stack(), "should be local"); 153 debug_only(const u1* const old_current = stream->current();) 154 155 // Used for batching symbol allocations. 156 const char* names[SymbolTable::symbol_alloc_batch_size]; 157 int lengths[SymbolTable::symbol_alloc_batch_size]; 158 int indices[SymbolTable::symbol_alloc_batch_size]; 159 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 160 int names_count = 0; 161 162 // parsing Index 0 is unused 163 for (int index = 1; index < length; index++) { 164 // Each of the following case guarantees one more byte in the stream 165 // for the following tag or the access_flags following constant pool, 166 // so we don't need bounds-check for reading tag. 167 const u1 tag = cfs->get_u1_fast(); 168 switch (tag) { 169 case JVM_CONSTANT_Class : { 170 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 171 const u2 name_index = cfs->get_u2_fast(); 172 cp->klass_index_at_put(index, name_index); 173 break; 174 } 175 case JVM_CONSTANT_Fieldref: { 176 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 177 const u2 class_index = cfs->get_u2_fast(); 178 const u2 name_and_type_index = cfs->get_u2_fast(); 179 cp->field_at_put(index, class_index, name_and_type_index); 180 break; 181 } 182 case JVM_CONSTANT_Methodref: { 183 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 184 const u2 class_index = cfs->get_u2_fast(); 185 const u2 name_and_type_index = cfs->get_u2_fast(); 186 cp->method_at_put(index, class_index, name_and_type_index); 187 break; 188 } 189 case JVM_CONSTANT_InterfaceMethodref: { 190 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 191 const u2 class_index = cfs->get_u2_fast(); 192 const u2 name_and_type_index = cfs->get_u2_fast(); 193 cp->interface_method_at_put(index, class_index, name_and_type_index); 194 break; 195 } 196 case JVM_CONSTANT_String : { 197 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 198 const u2 string_index = cfs->get_u2_fast(); 199 cp->string_index_at_put(index, string_index); 200 break; 201 } 202 case JVM_CONSTANT_MethodHandle : 203 case JVM_CONSTANT_MethodType: { 204 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 205 classfile_parse_error( 206 "Class file version does not support constant tag %u in class file %s", 207 tag, CHECK); 208 } 209 if (tag == JVM_CONSTANT_MethodHandle) { 210 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 211 const u1 ref_kind = cfs->get_u1_fast(); 212 const u2 method_index = cfs->get_u2_fast(); 213 cp->method_handle_index_at_put(index, ref_kind, method_index); 214 } 215 else if (tag == JVM_CONSTANT_MethodType) { 216 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 217 const u2 signature_index = cfs->get_u2_fast(); 218 cp->method_type_index_at_put(index, signature_index); 219 } 220 else { 221 ShouldNotReachHere(); 222 } 223 break; 224 } 225 case JVM_CONSTANT_Dynamic : { 226 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 227 classfile_parse_error( 228 "Class file version does not support constant tag %u in class file %s", 229 tag, CHECK); 230 } 231 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 232 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 233 const u2 name_and_type_index = cfs->get_u2_fast(); 234 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 235 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 236 } 237 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 238 break; 239 } 240 case JVM_CONSTANT_InvokeDynamic : { 241 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 242 classfile_parse_error( 243 "Class file version does not support constant tag %u in class file %s", 244 tag, CHECK); 245 } 246 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 247 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 248 const u2 name_and_type_index = cfs->get_u2_fast(); 249 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 250 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 251 } 252 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 253 break; 254 } 255 case JVM_CONSTANT_Integer: { 256 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 257 const u4 bytes = cfs->get_u4_fast(); 258 cp->int_at_put(index, (jint)bytes); 259 break; 260 } 261 case JVM_CONSTANT_Float: { 262 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 263 const u4 bytes = cfs->get_u4_fast(); 264 cp->float_at_put(index, *(jfloat*)&bytes); 265 break; 266 } 267 case JVM_CONSTANT_Long: { 268 // A mangled type might cause you to overrun allocated memory 269 guarantee_property(index + 1 < length, 270 "Invalid constant pool entry %u in class file %s", 271 index, 272 CHECK); 273 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 274 const u8 bytes = cfs->get_u8_fast(); 275 cp->long_at_put(index, bytes); 276 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 277 break; 278 } 279 case JVM_CONSTANT_Double: { 280 // A mangled type might cause you to overrun allocated memory 281 guarantee_property(index+1 < length, 282 "Invalid constant pool entry %u in class file %s", 283 index, 284 CHECK); 285 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 286 const u8 bytes = cfs->get_u8_fast(); 287 cp->double_at_put(index, *(jdouble*)&bytes); 288 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 289 break; 290 } 291 case JVM_CONSTANT_NameAndType: { 292 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 293 const u2 name_index = cfs->get_u2_fast(); 294 const u2 signature_index = cfs->get_u2_fast(); 295 cp->name_and_type_at_put(index, name_index, signature_index); 296 break; 297 } 298 case JVM_CONSTANT_Utf8 : { 299 cfs->guarantee_more(2, CHECK); // utf8_length 300 u2 utf8_length = cfs->get_u2_fast(); 301 const u1* utf8_buffer = cfs->current(); 302 assert(utf8_buffer != NULL, "null utf8 buffer"); 303 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 304 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 305 cfs->skip_u1_fast(utf8_length); 306 307 // Before storing the symbol, make sure it's legal 308 if (_need_verify) { 309 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 310 } 311 312 if (has_cp_patch_at(index)) { 313 Handle patch = clear_cp_patch_at(index); 314 guarantee_property(java_lang_String::is_instance(patch()), 315 "Illegal utf8 patch at %d in class file %s", 316 index, 317 CHECK); 318 const char* const str = java_lang_String::as_utf8_string(patch()); 319 // (could use java_lang_String::as_symbol instead, but might as well batch them) 320 utf8_buffer = (const u1*) str; 321 utf8_length = (u2) strlen(str); 322 } 323 324 unsigned int hash; 325 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 326 utf8_length, 327 hash); 328 if (result == NULL) { 329 names[names_count] = (const char*)utf8_buffer; 330 lengths[names_count] = utf8_length; 331 indices[names_count] = index; 332 hashValues[names_count++] = hash; 333 if (names_count == SymbolTable::symbol_alloc_batch_size) { 334 SymbolTable::new_symbols(_loader_data, 335 cp, 336 names_count, 337 names, 338 lengths, 339 indices, 340 hashValues); 341 names_count = 0; 342 } 343 } else { 344 cp->symbol_at_put(index, result); 345 } 346 break; 347 } 348 case JVM_CONSTANT_Module: 349 case JVM_CONSTANT_Package: { 350 // Record that an error occurred in these two cases but keep parsing so 351 // that ACC_Module can be checked for in the access_flags. Need to 352 // throw NoClassDefFoundError in that case. 353 if (_major_version >= JAVA_9_VERSION) { 354 cfs->guarantee_more(3, CHECK); 355 cfs->get_u2_fast(); 356 set_class_bad_constant_seen(tag); 357 break; 358 } 359 } 360 default: { 361 classfile_parse_error("Unknown constant tag %u in class file %s", 362 tag, 363 CHECK); 364 break; 365 } 366 } // end of switch(tag) 367 } // end of for 368 369 // Allocate the remaining symbols 370 if (names_count > 0) { 371 SymbolTable::new_symbols(_loader_data, 372 cp, 373 names_count, 374 names, 375 lengths, 376 indices, 377 hashValues); 378 } 379 380 // Copy _current pointer of local copy back to stream. 381 assert(stream->current() == old_current, "non-exclusive use of stream"); 382 stream->set_current(cfs1.current()); 383 384 } 385 386 static inline bool valid_cp_range(int index, int length) { 387 return (index > 0 && index < length); 388 } 389 390 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 391 assert(cp != NULL, "invariant"); 392 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 393 return cp->symbol_at(index); 394 } 395 return NULL; 396 } 397 398 #ifdef ASSERT 399 PRAGMA_DIAG_PUSH 400 PRAGMA_FORMAT_NONLITERAL_IGNORED 401 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 402 ResourceMark rm(THREAD); 403 fatal(msg, _class_name->as_C_string()); 404 } 405 406 void ClassFileParser::report_assert_property_failure(const char* msg, 407 int index, 408 TRAPS) const { 409 ResourceMark rm(THREAD); 410 fatal(msg, index, _class_name->as_C_string()); 411 } 412 PRAGMA_DIAG_POP 413 #endif 414 415 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 416 ConstantPool* const cp, 417 const int length, 418 TRAPS) { 419 assert(cp != NULL, "invariant"); 420 assert(stream != NULL, "invariant"); 421 422 // parsing constant pool entries 423 parse_constant_pool_entries(stream, cp, length, CHECK); 424 if (class_bad_constant_seen() != 0) { 425 // a bad CP entry has been detected previously so stop parsing and just return. 426 return; 427 } 428 429 int index = 1; // declared outside of loops for portability 430 int num_klasses = 0; 431 432 // first verification pass - validate cross references 433 // and fixup class and string constants 434 for (index = 1; index < length; index++) { // Index 0 is unused 435 const jbyte tag = cp->tag_at(index).value(); 436 switch (tag) { 437 case JVM_CONSTANT_Class: { 438 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 439 break; 440 } 441 case JVM_CONSTANT_Fieldref: 442 // fall through 443 case JVM_CONSTANT_Methodref: 444 // fall through 445 case JVM_CONSTANT_InterfaceMethodref: { 446 if (!_need_verify) break; 447 const int klass_ref_index = cp->klass_ref_index_at(index); 448 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 449 check_property(valid_klass_reference_at(klass_ref_index), 450 "Invalid constant pool index %u in class file %s", 451 klass_ref_index, CHECK); 452 check_property(valid_cp_range(name_and_type_ref_index, length) && 453 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 454 "Invalid constant pool index %u in class file %s", 455 name_and_type_ref_index, CHECK); 456 break; 457 } 458 case JVM_CONSTANT_String: { 459 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 460 break; 461 } 462 case JVM_CONSTANT_Integer: 463 break; 464 case JVM_CONSTANT_Float: 465 break; 466 case JVM_CONSTANT_Long: 467 case JVM_CONSTANT_Double: { 468 index++; 469 check_property( 470 (index < length && cp->tag_at(index).is_invalid()), 471 "Improper constant pool long/double index %u in class file %s", 472 index, CHECK); 473 break; 474 } 475 case JVM_CONSTANT_NameAndType: { 476 if (!_need_verify) break; 477 const int name_ref_index = cp->name_ref_index_at(index); 478 const int signature_ref_index = cp->signature_ref_index_at(index); 479 check_property(valid_symbol_at(name_ref_index), 480 "Invalid constant pool index %u in class file %s", 481 name_ref_index, CHECK); 482 check_property(valid_symbol_at(signature_ref_index), 483 "Invalid constant pool index %u in class file %s", 484 signature_ref_index, CHECK); 485 break; 486 } 487 case JVM_CONSTANT_Utf8: 488 break; 489 case JVM_CONSTANT_UnresolvedClass: // fall-through 490 case JVM_CONSTANT_UnresolvedClassInError: { 491 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 492 break; 493 } 494 case JVM_CONSTANT_ClassIndex: { 495 const int class_index = cp->klass_index_at(index); 496 check_property(valid_symbol_at(class_index), 497 "Invalid constant pool index %u in class file %s", 498 class_index, CHECK); 499 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 500 break; 501 } 502 case JVM_CONSTANT_StringIndex: { 503 const int string_index = cp->string_index_at(index); 504 check_property(valid_symbol_at(string_index), 505 "Invalid constant pool index %u in class file %s", 506 string_index, CHECK); 507 Symbol* const sym = cp->symbol_at(string_index); 508 cp->unresolved_string_at_put(index, sym); 509 break; 510 } 511 case JVM_CONSTANT_MethodHandle: { 512 const int ref_index = cp->method_handle_index_at(index); 513 check_property(valid_cp_range(ref_index, length), 514 "Invalid constant pool index %u in class file %s", 515 ref_index, CHECK); 516 const constantTag tag = cp->tag_at(ref_index); 517 const int ref_kind = cp->method_handle_ref_kind_at(index); 518 519 switch (ref_kind) { 520 case JVM_REF_getField: 521 case JVM_REF_getStatic: 522 case JVM_REF_putField: 523 case JVM_REF_putStatic: { 524 check_property( 525 tag.is_field(), 526 "Invalid constant pool index %u in class file %s (not a field)", 527 ref_index, CHECK); 528 break; 529 } 530 case JVM_REF_invokeVirtual: 531 case JVM_REF_newInvokeSpecial: { 532 check_property( 533 tag.is_method(), 534 "Invalid constant pool index %u in class file %s (not a method)", 535 ref_index, CHECK); 536 break; 537 } 538 case JVM_REF_invokeStatic: 539 case JVM_REF_invokeSpecial: { 540 check_property( 541 tag.is_method() || 542 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 543 "Invalid constant pool index %u in class file %s (not a method)", 544 ref_index, CHECK); 545 break; 546 } 547 case JVM_REF_invokeInterface: { 548 check_property( 549 tag.is_interface_method(), 550 "Invalid constant pool index %u in class file %s (not an interface method)", 551 ref_index, CHECK); 552 break; 553 } 554 default: { 555 classfile_parse_error( 556 "Bad method handle kind at constant pool index %u in class file %s", 557 index, CHECK); 558 } 559 } // switch(refkind) 560 // Keep the ref_index unchanged. It will be indirected at link-time. 561 break; 562 } // case MethodHandle 563 case JVM_CONSTANT_MethodType: { 564 const int ref_index = cp->method_type_index_at(index); 565 check_property(valid_symbol_at(ref_index), 566 "Invalid constant pool index %u in class file %s", 567 ref_index, CHECK); 568 break; 569 } 570 case JVM_CONSTANT_Dynamic: { 571 const int name_and_type_ref_index = 572 cp->bootstrap_name_and_type_ref_index_at(index); 573 574 check_property(valid_cp_range(name_and_type_ref_index, length) && 575 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 576 "Invalid constant pool index %u in class file %s", 577 name_and_type_ref_index, CHECK); 578 // bootstrap specifier index must be checked later, 579 // when BootstrapMethods attr is available 580 581 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 582 cp->set_has_dynamic_constant(); 583 break; 584 } 585 case JVM_CONSTANT_InvokeDynamic: { 586 const int name_and_type_ref_index = 587 cp->bootstrap_name_and_type_ref_index_at(index); 588 589 check_property(valid_cp_range(name_and_type_ref_index, length) && 590 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 591 "Invalid constant pool index %u in class file %s", 592 name_and_type_ref_index, CHECK); 593 // bootstrap specifier index must be checked later, 594 // when BootstrapMethods attr is available 595 break; 596 } 597 default: { 598 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 599 ShouldNotReachHere(); 600 break; 601 } 602 } // switch(tag) 603 } // end of for 604 605 _first_patched_klass_resolved_index = num_klasses; 606 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 607 608 if (_cp_patches != NULL) { 609 // need to treat this_class specially... 610 611 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 612 // for now. These will be replaced with actual names of the patched classes in patch_class(). 613 Symbol* s = vmSymbols::star_name(); 614 for (int n=_orig_cp_size; n<cp->length(); n++) { 615 cp->symbol_at_put(n, s); 616 } 617 618 int this_class_index; 619 { 620 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 621 const u1* const mark = stream->current(); 622 stream->skip_u2_fast(1); // skip flags 623 this_class_index = stream->get_u2_fast(); 624 stream->set_current(mark); // revert to mark 625 } 626 627 for (index = 1; index < length; index++) { // Index 0 is unused 628 if (has_cp_patch_at(index)) { 629 guarantee_property(index != this_class_index, 630 "Illegal constant pool patch to self at %d in class file %s", 631 index, CHECK); 632 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 633 } 634 } 635 } 636 637 if (!_need_verify) { 638 return; 639 } 640 641 // second verification pass - checks the strings are of the right format. 642 // but not yet to the other entries 643 for (index = 1; index < length; index++) { 644 const jbyte tag = cp->tag_at(index).value(); 645 switch (tag) { 646 case JVM_CONSTANT_UnresolvedClass: { 647 const Symbol* const class_name = cp->klass_name_at(index); 648 // check the name, even if _cp_patches will overwrite it 649 verify_legal_class_name(class_name, CHECK); 650 break; 651 } 652 case JVM_CONSTANT_NameAndType: { 653 if (_need_verify) { 654 const int sig_index = cp->signature_ref_index_at(index); 655 const int name_index = cp->name_ref_index_at(index); 656 const Symbol* const name = cp->symbol_at(name_index); 657 const Symbol* const sig = cp->symbol_at(sig_index); 658 guarantee_property(sig->utf8_length() != 0, 659 "Illegal zero length constant pool entry at %d in class %s", 660 sig_index, CHECK); 661 guarantee_property(name->utf8_length() != 0, 662 "Illegal zero length constant pool entry at %d in class %s", 663 name_index, CHECK); 664 665 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) { 666 // Format check method name and signature 667 verify_legal_method_name(name, CHECK); 668 verify_legal_method_signature(name, sig, CHECK); 669 } else { 670 // Format check field name and signature 671 verify_legal_field_name(name, CHECK); 672 verify_legal_field_signature(name, sig, CHECK); 673 } 674 } 675 break; 676 } 677 case JVM_CONSTANT_Dynamic: { 678 const int name_and_type_ref_index = 679 cp->name_and_type_ref_index_at(index); 680 // already verified to be utf8 681 const int name_ref_index = 682 cp->name_ref_index_at(name_and_type_ref_index); 683 // already verified to be utf8 684 const int signature_ref_index = 685 cp->signature_ref_index_at(name_and_type_ref_index); 686 const Symbol* const name = cp->symbol_at(name_ref_index); 687 const Symbol* const signature = cp->symbol_at(signature_ref_index); 688 if (_need_verify) { 689 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 690 // Need only to be sure signature is non-zero length and the right type. 691 if (signature->utf8_length() == 0 || 692 signature->char_at(0) == JVM_SIGNATURE_FUNC) { 693 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 694 } 695 } 696 break; 697 } 698 case JVM_CONSTANT_InvokeDynamic: 699 case JVM_CONSTANT_Fieldref: 700 case JVM_CONSTANT_Methodref: 701 case JVM_CONSTANT_InterfaceMethodref: { 702 const int name_and_type_ref_index = 703 cp->name_and_type_ref_index_at(index); 704 // already verified to be utf8 705 const int name_ref_index = 706 cp->name_ref_index_at(name_and_type_ref_index); 707 // already verified to be utf8 708 const int signature_ref_index = 709 cp->signature_ref_index_at(name_and_type_ref_index); 710 const Symbol* const name = cp->symbol_at(name_ref_index); 711 const Symbol* const signature = cp->symbol_at(signature_ref_index); 712 if (tag == JVM_CONSTANT_Fieldref) { 713 if (_need_verify) { 714 // Field name and signature are verified above, when iterating NameAndType_info. 715 // Need only to be sure signature is non-zero length and the right type. 716 if (signature->utf8_length() == 0 || 717 signature->char_at(0) == JVM_SIGNATURE_FUNC) { 718 throwIllegalSignature("Field", name, signature, CHECK); 719 } 720 } 721 } else { 722 if (_need_verify) { 723 // Method name and signature are verified above, when iterating NameAndType_info. 724 // Need only to be sure signature is non-zero length and the right type. 725 if (signature->utf8_length() == 0 || 726 signature->char_at(0) != JVM_SIGNATURE_FUNC) { 727 throwIllegalSignature("Method", name, signature, CHECK); 728 } 729 } 730 // 4509014: If a class method name begins with '<', it must be "<init>" 731 const unsigned int name_len = name->utf8_length(); 732 if (tag == JVM_CONSTANT_Methodref && 733 name_len != 0 && 734 name->char_at(0) == JVM_SIGNATURE_SPECIAL && 735 name != vmSymbols::object_initializer_name()) { 736 classfile_parse_error( 737 "Bad method name at constant pool index %u in class file %s", 738 name_ref_index, CHECK); 739 } 740 } 741 break; 742 } 743 case JVM_CONSTANT_MethodHandle: { 744 const int ref_index = cp->method_handle_index_at(index); 745 const int ref_kind = cp->method_handle_ref_kind_at(index); 746 switch (ref_kind) { 747 case JVM_REF_invokeVirtual: 748 case JVM_REF_invokeStatic: 749 case JVM_REF_invokeSpecial: 750 case JVM_REF_newInvokeSpecial: { 751 const int name_and_type_ref_index = 752 cp->name_and_type_ref_index_at(ref_index); 753 const int name_ref_index = 754 cp->name_ref_index_at(name_and_type_ref_index); 755 const Symbol* const name = cp->symbol_at(name_ref_index); 756 if (ref_kind == JVM_REF_newInvokeSpecial) { 757 if (name != vmSymbols::object_initializer_name()) { 758 classfile_parse_error( 759 "Bad constructor name at constant pool index %u in class file %s", 760 name_ref_index, CHECK); 761 } 762 } else { 763 if (name == vmSymbols::object_initializer_name()) { 764 classfile_parse_error( 765 "Bad method name at constant pool index %u in class file %s", 766 name_ref_index, CHECK); 767 } 768 } 769 break; 770 } 771 // Other ref_kinds are already fully checked in previous pass. 772 } // switch(ref_kind) 773 break; 774 } 775 case JVM_CONSTANT_MethodType: { 776 const Symbol* const no_name = vmSymbols::type_name(); // place holder 777 const Symbol* const signature = cp->method_type_signature_at(index); 778 verify_legal_method_signature(no_name, signature, CHECK); 779 break; 780 } 781 case JVM_CONSTANT_Utf8: { 782 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 783 } 784 } // switch(tag) 785 } // end of for 786 } 787 788 Handle ClassFileParser::clear_cp_patch_at(int index) { 789 Handle patch = cp_patch_at(index); 790 _cp_patches->at_put(index, Handle()); 791 assert(!has_cp_patch_at(index), ""); 792 return patch; 793 } 794 795 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) { 796 int name_index = _orig_cp_size + _num_patched_klasses; 797 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses; 798 799 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name); 800 _num_patched_klasses ++; 801 } 802 803 void ClassFileParser::patch_constant_pool(ConstantPool* cp, 804 int index, 805 Handle patch, 806 TRAPS) { 807 assert(cp != NULL, "invariant"); 808 809 BasicType patch_type = T_VOID; 810 811 switch (cp->tag_at(index).value()) { 812 813 case JVM_CONSTANT_UnresolvedClass: { 814 // Patching a class means pre-resolving it. 815 // The name in the constant pool is ignored. 816 if (java_lang_Class::is_instance(patch())) { 817 guarantee_property(!java_lang_Class::is_primitive(patch()), 818 "Illegal class patch at %d in class file %s", 819 index, CHECK); 820 Klass* k = java_lang_Class::as_Klass(patch()); 821 patch_class(cp, index, k, k->name()); 822 } else { 823 guarantee_property(java_lang_String::is_instance(patch()), 824 "Illegal class patch at %d in class file %s", 825 index, CHECK); 826 Symbol* const name = java_lang_String::as_symbol(patch()); 827 patch_class(cp, index, NULL, name); 828 } 829 break; 830 } 831 832 case JVM_CONSTANT_String: { 833 // skip this patch and don't clear it. Needs the oop array for resolved 834 // references to be created first. 835 return; 836 } 837 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 838 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 839 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 840 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 841 patch_prim: 842 { 843 jvalue value; 844 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 845 guarantee_property(value_type == patch_type, 846 "Illegal primitive patch at %d in class file %s", 847 index, CHECK); 848 switch (value_type) { 849 case T_INT: cp->int_at_put(index, value.i); break; 850 case T_FLOAT: cp->float_at_put(index, value.f); break; 851 case T_LONG: cp->long_at_put(index, value.j); break; 852 case T_DOUBLE: cp->double_at_put(index, value.d); break; 853 default: assert(false, ""); 854 } 855 } // end patch_prim label 856 break; 857 858 default: { 859 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 860 guarantee_property(!has_cp_patch_at(index), 861 "Illegal unexpected patch at %d in class file %s", 862 index, CHECK); 863 return; 864 } 865 } // end of switch(tag) 866 867 // On fall-through, mark the patch as used. 868 clear_cp_patch_at(index); 869 } 870 class NameSigHash: public ResourceObj { 871 public: 872 const Symbol* _name; // name 873 const Symbol* _sig; // signature 874 NameSigHash* _next; // Next entry in hash table 875 }; 876 877 static const int HASH_ROW_SIZE = 256; 878 879 static unsigned int hash(const Symbol* name, const Symbol* sig) { 880 unsigned int raw_hash = 0; 881 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 882 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 883 884 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 885 } 886 887 888 static void initialize_hashtable(NameSigHash** table) { 889 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 890 } 891 // Return false if the name/sig combination is found in table. 892 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 893 // The old format checker uses heap sort to find duplicates. 894 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 895 // of table since we don't expect Symbol*'s to move. 896 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 897 assert(name != NULL, "name in constant pool is NULL"); 898 899 // First lookup for duplicates 900 int index = hash(name, sig); 901 NameSigHash* entry = table[index]; 902 while (entry != NULL) { 903 if (entry->_name == name && entry->_sig == sig) { 904 return false; 905 } 906 entry = entry->_next; 907 } 908 909 // No duplicate is found, allocate a new entry and fill it. 910 entry = new NameSigHash(); 911 entry->_name = name; 912 entry->_sig = sig; 913 914 // Insert into hash table 915 entry->_next = table[index]; 916 table[index] = entry; 917 918 return true; 919 } 920 921 // Side-effects: populates the _local_interfaces field 922 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 923 const int itfs_len, 924 ConstantPool* const cp, 925 bool* const has_nonstatic_concrete_methods, 926 TRAPS) { 927 assert(stream != NULL, "invariant"); 928 assert(cp != NULL, "invariant"); 929 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 930 931 if (itfs_len == 0) { 932 _local_interfaces = Universe::the_empty_instance_klass_array(); 933 } else { 934 assert(itfs_len > 0, "only called for len>0"); 935 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK); 936 937 int index; 938 for (index = 0; index < itfs_len; index++) { 939 const u2 interface_index = stream->get_u2(CHECK); 940 Klass* interf; 941 check_property( 942 valid_klass_reference_at(interface_index), 943 "Interface name has bad constant pool index %u in class file %s", 944 interface_index, CHECK); 945 if (cp->tag_at(interface_index).is_klass()) { 946 interf = cp->resolved_klass_at(interface_index); 947 } else { 948 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 949 950 // Don't need to check legal name because it's checked when parsing constant pool. 951 // But need to make sure it's not an array type. 952 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 953 "Bad interface name in class file %s", CHECK); 954 955 // Call resolve_super so classcircularity is checked 956 interf = SystemDictionary::resolve_super_or_fail( 957 _class_name, 958 unresolved_klass, 959 Handle(THREAD, _loader_data->class_loader()), 960 _protection_domain, 961 false, 962 CHECK); 963 } 964 965 if (!interf->is_interface()) { 966 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 967 err_msg("class %s can not implement %s, because it is not an interface (%s)", 968 _class_name->as_klass_external_name(), 969 interf->external_name(), 970 interf->class_in_module_of_loader())); 971 } 972 973 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 974 *has_nonstatic_concrete_methods = true; 975 } 976 _local_interfaces->at_put(index, InstanceKlass::cast(interf)); 977 } 978 979 if (!_need_verify || itfs_len <= 1) { 980 return; 981 } 982 983 // Check if there's any duplicates in interfaces 984 ResourceMark rm(THREAD); 985 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 986 NameSigHash*, 987 HASH_ROW_SIZE); 988 initialize_hashtable(interface_names); 989 bool dup = false; 990 const Symbol* name = NULL; 991 { 992 debug_only(NoSafepointVerifier nsv;) 993 for (index = 0; index < itfs_len; index++) { 994 const InstanceKlass* const k = _local_interfaces->at(index); 995 name = k->name(); 996 // If no duplicates, add (name, NULL) in hashtable interface_names. 997 if (!put_after_lookup(name, NULL, interface_names)) { 998 dup = true; 999 break; 1000 } 1001 } 1002 } 1003 if (dup) { 1004 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 1005 name->as_C_string(), CHECK); 1006 } 1007 } 1008 } 1009 1010 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1011 int constantvalue_index, 1012 int signature_index, 1013 TRAPS) const { 1014 // Make sure the constant pool entry is of a type appropriate to this field 1015 guarantee_property( 1016 (constantvalue_index > 0 && 1017 constantvalue_index < cp->length()), 1018 "Bad initial value index %u in ConstantValue attribute in class file %s", 1019 constantvalue_index, CHECK); 1020 1021 const constantTag value_type = cp->tag_at(constantvalue_index); 1022 switch(cp->basic_type_for_signature_at(signature_index)) { 1023 case T_LONG: { 1024 guarantee_property(value_type.is_long(), 1025 "Inconsistent constant value type in class file %s", 1026 CHECK); 1027 break; 1028 } 1029 case T_FLOAT: { 1030 guarantee_property(value_type.is_float(), 1031 "Inconsistent constant value type in class file %s", 1032 CHECK); 1033 break; 1034 } 1035 case T_DOUBLE: { 1036 guarantee_property(value_type.is_double(), 1037 "Inconsistent constant value type in class file %s", 1038 CHECK); 1039 break; 1040 } 1041 case T_BYTE: 1042 case T_CHAR: 1043 case T_SHORT: 1044 case T_BOOLEAN: 1045 case T_INT: { 1046 guarantee_property(value_type.is_int(), 1047 "Inconsistent constant value type in class file %s", 1048 CHECK); 1049 break; 1050 } 1051 case T_OBJECT: { 1052 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1053 && value_type.is_string()), 1054 "Bad string initial value in class file %s", 1055 CHECK); 1056 break; 1057 } 1058 default: { 1059 classfile_parse_error("Unable to set initial value %u in class file %s", 1060 constantvalue_index, 1061 CHECK); 1062 } 1063 } 1064 } 1065 1066 class AnnotationCollector : public ResourceObj{ 1067 public: 1068 enum Location { _in_field, _in_method, _in_class }; 1069 enum ID { 1070 _unknown = 0, 1071 _method_CallerSensitive, 1072 _method_ForceInline, 1073 _method_DontInline, 1074 _method_InjectedProfile, 1075 _method_LambdaForm_Compiled, 1076 _method_Hidden, 1077 _method_HotSpotIntrinsicCandidate, 1078 _jdk_internal_vm_annotation_Contended, 1079 _field_Stable, 1080 _jdk_internal_vm_annotation_ReservedStackAccess, 1081 _annotation_LIMIT 1082 }; 1083 const Location _location; 1084 int _annotations_present; 1085 u2 _contended_group; 1086 1087 AnnotationCollector(Location location) 1088 : _location(location), _annotations_present(0) 1089 { 1090 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1091 } 1092 // If this annotation name has an ID, report it (or _none). 1093 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 1094 // Set the annotation name: 1095 void set_annotation(ID id) { 1096 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1097 _annotations_present |= nth_bit((int)id); 1098 } 1099 1100 void remove_annotation(ID id) { 1101 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1102 _annotations_present &= ~nth_bit((int)id); 1103 } 1104 1105 // Report if the annotation is present. 1106 bool has_any_annotations() const { return _annotations_present != 0; } 1107 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1108 1109 void set_contended_group(u2 group) { _contended_group = group; } 1110 u2 contended_group() const { return _contended_group; } 1111 1112 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1113 1114 void set_stable(bool stable) { set_annotation(_field_Stable); } 1115 bool is_stable() const { return has_annotation(_field_Stable); } 1116 }; 1117 1118 // This class also doubles as a holder for metadata cleanup. 1119 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1120 private: 1121 ClassLoaderData* _loader_data; 1122 AnnotationArray* _field_annotations; 1123 AnnotationArray* _field_type_annotations; 1124 public: 1125 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1126 AnnotationCollector(_in_field), 1127 _loader_data(loader_data), 1128 _field_annotations(NULL), 1129 _field_type_annotations(NULL) {} 1130 ~FieldAnnotationCollector(); 1131 void apply_to(FieldInfo* f); 1132 AnnotationArray* field_annotations() { return _field_annotations; } 1133 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1134 1135 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1136 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1137 }; 1138 1139 class MethodAnnotationCollector : public AnnotationCollector{ 1140 public: 1141 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1142 void apply_to(const methodHandle& m); 1143 }; 1144 1145 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1146 public: 1147 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1148 void apply_to(InstanceKlass* ik); 1149 }; 1150 1151 1152 static int skip_annotation_value(const u1*, int, int); // fwd decl 1153 1154 // Safely increment index by val if does not pass limit 1155 #define SAFE_ADD(index, limit, val) \ 1156 if (index >= limit - val) return limit; \ 1157 index += val; 1158 1159 // Skip an annotation. Return >=limit if there is any problem. 1160 static int skip_annotation(const u1* buffer, int limit, int index) { 1161 assert(buffer != NULL, "invariant"); 1162 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1163 // value := switch (tag:u1) { ... } 1164 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1165 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1166 while (--nmem >= 0 && index < limit) { 1167 SAFE_ADD(index, limit, 2); // skip member 1168 index = skip_annotation_value(buffer, limit, index); 1169 } 1170 return index; 1171 } 1172 1173 // Skip an annotation value. Return >=limit if there is any problem. 1174 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1175 assert(buffer != NULL, "invariant"); 1176 1177 // value := switch (tag:u1) { 1178 // case B, C, I, S, Z, D, F, J, c: con:u2; 1179 // case e: e_class:u2 e_name:u2; 1180 // case s: s_con:u2; 1181 // case [: do(nval:u2) {value}; 1182 // case @: annotation; 1183 // case s: s_con:u2; 1184 // } 1185 SAFE_ADD(index, limit, 1); // read tag 1186 const u1 tag = buffer[index - 1]; 1187 switch (tag) { 1188 case 'B': 1189 case 'C': 1190 case 'I': 1191 case 'S': 1192 case 'Z': 1193 case 'D': 1194 case 'F': 1195 case 'J': 1196 case 'c': 1197 case 's': 1198 SAFE_ADD(index, limit, 2); // skip con or s_con 1199 break; 1200 case 'e': 1201 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1202 break; 1203 case '[': 1204 { 1205 SAFE_ADD(index, limit, 2); // read nval 1206 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1207 while (--nval >= 0 && index < limit) { 1208 index = skip_annotation_value(buffer, limit, index); 1209 } 1210 } 1211 break; 1212 case '@': 1213 index = skip_annotation(buffer, limit, index); 1214 break; 1215 default: 1216 return limit; // bad tag byte 1217 } 1218 return index; 1219 } 1220 1221 // Sift through annotations, looking for those significant to the VM: 1222 static void parse_annotations(const ConstantPool* const cp, 1223 const u1* buffer, int limit, 1224 AnnotationCollector* coll, 1225 ClassLoaderData* loader_data, 1226 TRAPS) { 1227 1228 assert(cp != NULL, "invariant"); 1229 assert(buffer != NULL, "invariant"); 1230 assert(coll != NULL, "invariant"); 1231 assert(loader_data != NULL, "invariant"); 1232 1233 // annotations := do(nann:u2) {annotation} 1234 int index = 2; // read nann 1235 if (index >= limit) return; 1236 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1237 enum { // initial annotation layout 1238 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1239 count_off = 2, // u2 such as 1 (one value) 1240 member_off = 4, // utf8 such as 'value' 1241 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1242 e_tag_val = 'e', 1243 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1244 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1245 e_size = 11, // end of 'e' annotation 1246 c_tag_val = 'c', // payload is type 1247 c_con_off = 7, // utf8 payload, such as 'I' 1248 c_size = 9, // end of 'c' annotation 1249 s_tag_val = 's', // payload is String 1250 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1251 s_size = 9, 1252 min_size = 6 // smallest possible size (zero members) 1253 }; 1254 // Cannot add min_size to index in case of overflow MAX_INT 1255 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1256 int index0 = index; 1257 index = skip_annotation(buffer, limit, index); 1258 const u1* const abase = buffer + index0; 1259 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1260 const int count = Bytes::get_Java_u2((address)abase + count_off); 1261 const Symbol* const aname = check_symbol_at(cp, atype); 1262 if (aname == NULL) break; // invalid annotation name 1263 const Symbol* member = NULL; 1264 if (count >= 1) { 1265 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1266 member = check_symbol_at(cp, member_index); 1267 if (member == NULL) break; // invalid member name 1268 } 1269 1270 // Here is where parsing particular annotations will take place. 1271 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1272 if (AnnotationCollector::_unknown == id) continue; 1273 coll->set_annotation(id); 1274 1275 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1276 // @Contended can optionally specify the contention group. 1277 // 1278 // Contended group defines the equivalence class over the fields: 1279 // the fields within the same contended group are not treated distinct. 1280 // The only exception is default group, which does not incur the 1281 // equivalence. Naturally, contention group for classes is meaningless. 1282 // 1283 // While the contention group is specified as String, annotation 1284 // values are already interned, and we might as well use the constant 1285 // pool index as the group tag. 1286 // 1287 u2 group_index = 0; // default contended group 1288 if (count == 1 1289 && s_size == (index - index0) // match size 1290 && s_tag_val == *(abase + tag_off) 1291 && member == vmSymbols::value_name()) { 1292 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1293 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1294 group_index = 0; // default contended group 1295 } 1296 } 1297 coll->set_contended_group(group_index); 1298 } 1299 } 1300 } 1301 1302 1303 // Parse attributes for a field. 1304 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1305 u2 attributes_count, 1306 bool is_static, u2 signature_index, 1307 u2* const constantvalue_index_addr, 1308 bool* const is_synthetic_addr, 1309 u2* const generic_signature_index_addr, 1310 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1311 TRAPS) { 1312 assert(cfs != NULL, "invariant"); 1313 assert(constantvalue_index_addr != NULL, "invariant"); 1314 assert(is_synthetic_addr != NULL, "invariant"); 1315 assert(generic_signature_index_addr != NULL, "invariant"); 1316 assert(parsed_annotations != NULL, "invariant"); 1317 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1318 1319 u2 constantvalue_index = 0; 1320 u2 generic_signature_index = 0; 1321 bool is_synthetic = false; 1322 const u1* runtime_visible_annotations = NULL; 1323 int runtime_visible_annotations_length = 0; 1324 const u1* runtime_invisible_annotations = NULL; 1325 int runtime_invisible_annotations_length = 0; 1326 const u1* runtime_visible_type_annotations = NULL; 1327 int runtime_visible_type_annotations_length = 0; 1328 const u1* runtime_invisible_type_annotations = NULL; 1329 int runtime_invisible_type_annotations_length = 0; 1330 bool runtime_invisible_annotations_exists = false; 1331 bool runtime_invisible_type_annotations_exists = false; 1332 const ConstantPool* const cp = _cp; 1333 1334 while (attributes_count--) { 1335 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1336 const u2 attribute_name_index = cfs->get_u2_fast(); 1337 const u4 attribute_length = cfs->get_u4_fast(); 1338 check_property(valid_symbol_at(attribute_name_index), 1339 "Invalid field attribute index %u in class file %s", 1340 attribute_name_index, 1341 CHECK); 1342 1343 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1344 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1345 // ignore if non-static 1346 if (constantvalue_index != 0) { 1347 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1348 } 1349 check_property( 1350 attribute_length == 2, 1351 "Invalid ConstantValue field attribute length %u in class file %s", 1352 attribute_length, CHECK); 1353 1354 constantvalue_index = cfs->get_u2(CHECK); 1355 if (_need_verify) { 1356 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1357 } 1358 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1359 if (attribute_length != 0) { 1360 classfile_parse_error( 1361 "Invalid Synthetic field attribute length %u in class file %s", 1362 attribute_length, CHECK); 1363 } 1364 is_synthetic = true; 1365 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1366 if (attribute_length != 0) { 1367 classfile_parse_error( 1368 "Invalid Deprecated field attribute length %u in class file %s", 1369 attribute_length, CHECK); 1370 } 1371 } else if (_major_version >= JAVA_1_5_VERSION) { 1372 if (attribute_name == vmSymbols::tag_signature()) { 1373 if (generic_signature_index != 0) { 1374 classfile_parse_error( 1375 "Multiple Signature attributes for field in class file %s", CHECK); 1376 } 1377 if (attribute_length != 2) { 1378 classfile_parse_error( 1379 "Wrong size %u for field's Signature attribute in class file %s", 1380 attribute_length, CHECK); 1381 } 1382 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1383 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1384 if (runtime_visible_annotations != NULL) { 1385 classfile_parse_error( 1386 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1387 } 1388 runtime_visible_annotations_length = attribute_length; 1389 runtime_visible_annotations = cfs->current(); 1390 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1391 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1392 parse_annotations(cp, 1393 runtime_visible_annotations, 1394 runtime_visible_annotations_length, 1395 parsed_annotations, 1396 _loader_data, 1397 CHECK); 1398 cfs->skip_u1_fast(runtime_visible_annotations_length); 1399 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1400 if (runtime_invisible_annotations_exists) { 1401 classfile_parse_error( 1402 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1403 } 1404 runtime_invisible_annotations_exists = true; 1405 if (PreserveAllAnnotations) { 1406 runtime_invisible_annotations_length = attribute_length; 1407 runtime_invisible_annotations = cfs->current(); 1408 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1409 } 1410 cfs->skip_u1(attribute_length, CHECK); 1411 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1412 if (runtime_visible_type_annotations != NULL) { 1413 classfile_parse_error( 1414 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1415 } 1416 runtime_visible_type_annotations_length = attribute_length; 1417 runtime_visible_type_annotations = cfs->current(); 1418 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1419 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1420 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1421 if (runtime_invisible_type_annotations_exists) { 1422 classfile_parse_error( 1423 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1424 } else { 1425 runtime_invisible_type_annotations_exists = true; 1426 } 1427 if (PreserveAllAnnotations) { 1428 runtime_invisible_type_annotations_length = attribute_length; 1429 runtime_invisible_type_annotations = cfs->current(); 1430 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1431 } 1432 cfs->skip_u1(attribute_length, CHECK); 1433 } else { 1434 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1435 } 1436 } else { 1437 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1438 } 1439 } 1440 1441 *constantvalue_index_addr = constantvalue_index; 1442 *is_synthetic_addr = is_synthetic; 1443 *generic_signature_index_addr = generic_signature_index; 1444 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1445 runtime_visible_annotations_length, 1446 runtime_invisible_annotations, 1447 runtime_invisible_annotations_length, 1448 CHECK); 1449 parsed_annotations->set_field_annotations(a); 1450 a = assemble_annotations(runtime_visible_type_annotations, 1451 runtime_visible_type_annotations_length, 1452 runtime_invisible_type_annotations, 1453 runtime_invisible_type_annotations_length, 1454 CHECK); 1455 parsed_annotations->set_field_type_annotations(a); 1456 return; 1457 } 1458 1459 1460 // Field allocation types. Used for computing field offsets. 1461 1462 enum FieldAllocationType { 1463 STATIC_OOP, // Oops 1464 STATIC_BYTE, // Boolean, Byte, char 1465 STATIC_SHORT, // shorts 1466 STATIC_WORD, // ints 1467 STATIC_DOUBLE, // aligned long or double 1468 NONSTATIC_OOP, 1469 NONSTATIC_BYTE, 1470 NONSTATIC_SHORT, 1471 NONSTATIC_WORD, 1472 NONSTATIC_DOUBLE, 1473 MAX_FIELD_ALLOCATION_TYPE, 1474 BAD_ALLOCATION_TYPE = -1 1475 }; 1476 1477 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1478 BAD_ALLOCATION_TYPE, // 0 1479 BAD_ALLOCATION_TYPE, // 1 1480 BAD_ALLOCATION_TYPE, // 2 1481 BAD_ALLOCATION_TYPE, // 3 1482 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1483 NONSTATIC_SHORT, // T_CHAR = 5, 1484 NONSTATIC_WORD, // T_FLOAT = 6, 1485 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1486 NONSTATIC_BYTE, // T_BYTE = 8, 1487 NONSTATIC_SHORT, // T_SHORT = 9, 1488 NONSTATIC_WORD, // T_INT = 10, 1489 NONSTATIC_DOUBLE, // T_LONG = 11, 1490 NONSTATIC_OOP, // T_OBJECT = 12, 1491 NONSTATIC_OOP, // T_ARRAY = 13, 1492 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1493 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1494 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1495 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1496 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1497 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1498 BAD_ALLOCATION_TYPE, // 0 1499 BAD_ALLOCATION_TYPE, // 1 1500 BAD_ALLOCATION_TYPE, // 2 1501 BAD_ALLOCATION_TYPE, // 3 1502 STATIC_BYTE , // T_BOOLEAN = 4, 1503 STATIC_SHORT, // T_CHAR = 5, 1504 STATIC_WORD, // T_FLOAT = 6, 1505 STATIC_DOUBLE, // T_DOUBLE = 7, 1506 STATIC_BYTE, // T_BYTE = 8, 1507 STATIC_SHORT, // T_SHORT = 9, 1508 STATIC_WORD, // T_INT = 10, 1509 STATIC_DOUBLE, // T_LONG = 11, 1510 STATIC_OOP, // T_OBJECT = 12, 1511 STATIC_OOP, // T_ARRAY = 13, 1512 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1513 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1514 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1515 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1516 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1517 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1518 }; 1519 1520 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1521 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1522 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1523 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1524 return result; 1525 } 1526 1527 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1528 public: 1529 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1530 1531 FieldAllocationCount() { 1532 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1533 count[i] = 0; 1534 } 1535 } 1536 1537 FieldAllocationType update(bool is_static, BasicType type) { 1538 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1539 if (atype != BAD_ALLOCATION_TYPE) { 1540 // Make sure there is no overflow with injected fields. 1541 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1542 count[atype]++; 1543 } 1544 return atype; 1545 } 1546 }; 1547 1548 // Side-effects: populates the _fields, _fields_annotations, 1549 // _fields_type_annotations fields 1550 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1551 bool is_interface, 1552 FieldAllocationCount* const fac, 1553 ConstantPool* cp, 1554 const int cp_size, 1555 u2* const java_fields_count_ptr, 1556 TRAPS) { 1557 1558 assert(cfs != NULL, "invariant"); 1559 assert(fac != NULL, "invariant"); 1560 assert(cp != NULL, "invariant"); 1561 assert(java_fields_count_ptr != NULL, "invariant"); 1562 1563 assert(NULL == _fields, "invariant"); 1564 assert(NULL == _fields_annotations, "invariant"); 1565 assert(NULL == _fields_type_annotations, "invariant"); 1566 1567 cfs->guarantee_more(2, CHECK); // length 1568 const u2 length = cfs->get_u2_fast(); 1569 *java_fields_count_ptr = length; 1570 1571 int num_injected = 0; 1572 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1573 &num_injected); 1574 const int total_fields = length + num_injected; 1575 1576 // The field array starts with tuples of shorts 1577 // [access, name index, sig index, initial value index, byte offset]. 1578 // A generic signature slot only exists for field with generic 1579 // signature attribute. And the access flag is set with 1580 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1581 // signature slots are at the end of the field array and after all 1582 // other fields data. 1583 // 1584 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1585 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1586 // ... 1587 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1588 // [generic signature index] 1589 // [generic signature index] 1590 // ... 1591 // 1592 // Allocate a temporary resource array for field data. For each field, 1593 // a slot is reserved in the temporary array for the generic signature 1594 // index. After parsing all fields, the data are copied to a permanent 1595 // array and any unused slots will be discarded. 1596 ResourceMark rm(THREAD); 1597 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1598 u2, 1599 total_fields * (FieldInfo::field_slots + 1)); 1600 1601 // The generic signature slots start after all other fields' data. 1602 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1603 int num_generic_signature = 0; 1604 for (int n = 0; n < length; n++) { 1605 // access_flags, name_index, descriptor_index, attributes_count 1606 cfs->guarantee_more(8, CHECK); 1607 1608 AccessFlags access_flags; 1609 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1610 verify_legal_field_modifiers(flags, is_interface, CHECK); 1611 access_flags.set_flags(flags); 1612 1613 const u2 name_index = cfs->get_u2_fast(); 1614 check_property(valid_symbol_at(name_index), 1615 "Invalid constant pool index %u for field name in class file %s", 1616 name_index, CHECK); 1617 const Symbol* const name = cp->symbol_at(name_index); 1618 verify_legal_field_name(name, CHECK); 1619 1620 const u2 signature_index = cfs->get_u2_fast(); 1621 check_property(valid_symbol_at(signature_index), 1622 "Invalid constant pool index %u for field signature in class file %s", 1623 signature_index, CHECK); 1624 const Symbol* const sig = cp->symbol_at(signature_index); 1625 verify_legal_field_signature(name, sig, CHECK); 1626 1627 u2 constantvalue_index = 0; 1628 bool is_synthetic = false; 1629 u2 generic_signature_index = 0; 1630 const bool is_static = access_flags.is_static(); 1631 FieldAnnotationCollector parsed_annotations(_loader_data); 1632 1633 const u2 attributes_count = cfs->get_u2_fast(); 1634 if (attributes_count > 0) { 1635 parse_field_attributes(cfs, 1636 attributes_count, 1637 is_static, 1638 signature_index, 1639 &constantvalue_index, 1640 &is_synthetic, 1641 &generic_signature_index, 1642 &parsed_annotations, 1643 CHECK); 1644 1645 if (parsed_annotations.field_annotations() != NULL) { 1646 if (_fields_annotations == NULL) { 1647 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1648 _loader_data, length, NULL, 1649 CHECK); 1650 } 1651 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1652 parsed_annotations.set_field_annotations(NULL); 1653 } 1654 if (parsed_annotations.field_type_annotations() != NULL) { 1655 if (_fields_type_annotations == NULL) { 1656 _fields_type_annotations = 1657 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1658 length, 1659 NULL, 1660 CHECK); 1661 } 1662 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1663 parsed_annotations.set_field_type_annotations(NULL); 1664 } 1665 1666 if (is_synthetic) { 1667 access_flags.set_is_synthetic(); 1668 } 1669 if (generic_signature_index != 0) { 1670 access_flags.set_field_has_generic_signature(); 1671 fa[generic_signature_slot] = generic_signature_index; 1672 generic_signature_slot ++; 1673 num_generic_signature ++; 1674 } 1675 } 1676 1677 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1678 field->initialize(access_flags.as_short(), 1679 name_index, 1680 signature_index, 1681 constantvalue_index); 1682 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1683 1684 // Remember how many oops we encountered and compute allocation type 1685 const FieldAllocationType atype = fac->update(is_static, type); 1686 field->set_allocation_type(atype); 1687 1688 // After field is initialized with type, we can augment it with aux info 1689 if (parsed_annotations.has_any_annotations()) 1690 parsed_annotations.apply_to(field); 1691 } 1692 1693 int index = length; 1694 if (num_injected != 0) { 1695 for (int n = 0; n < num_injected; n++) { 1696 // Check for duplicates 1697 if (injected[n].may_be_java) { 1698 const Symbol* const name = injected[n].name(); 1699 const Symbol* const signature = injected[n].signature(); 1700 bool duplicate = false; 1701 for (int i = 0; i < length; i++) { 1702 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1703 if (name == cp->symbol_at(f->name_index()) && 1704 signature == cp->symbol_at(f->signature_index())) { 1705 // Symbol is desclared in Java so skip this one 1706 duplicate = true; 1707 break; 1708 } 1709 } 1710 if (duplicate) { 1711 // These will be removed from the field array at the end 1712 continue; 1713 } 1714 } 1715 1716 // Injected field 1717 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1718 field->initialize(JVM_ACC_FIELD_INTERNAL, 1719 injected[n].name_index, 1720 injected[n].signature_index, 1721 0); 1722 1723 const BasicType type = FieldType::basic_type(injected[n].signature()); 1724 1725 // Remember how many oops we encountered and compute allocation type 1726 const FieldAllocationType atype = fac->update(false, type); 1727 field->set_allocation_type(atype); 1728 index++; 1729 } 1730 } 1731 1732 assert(NULL == _fields, "invariant"); 1733 1734 _fields = 1735 MetadataFactory::new_array<u2>(_loader_data, 1736 index * FieldInfo::field_slots + num_generic_signature, 1737 CHECK); 1738 // Sometimes injected fields already exist in the Java source so 1739 // the fields array could be too long. In that case the 1740 // fields array is trimed. Also unused slots that were reserved 1741 // for generic signature indexes are discarded. 1742 { 1743 int i = 0; 1744 for (; i < index * FieldInfo::field_slots; i++) { 1745 _fields->at_put(i, fa[i]); 1746 } 1747 for (int j = total_fields * FieldInfo::field_slots; 1748 j < generic_signature_slot; j++) { 1749 _fields->at_put(i++, fa[j]); 1750 } 1751 assert(_fields->length() == i, ""); 1752 } 1753 1754 if (_need_verify && length > 1) { 1755 // Check duplicated fields 1756 ResourceMark rm(THREAD); 1757 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1758 THREAD, NameSigHash*, HASH_ROW_SIZE); 1759 initialize_hashtable(names_and_sigs); 1760 bool dup = false; 1761 const Symbol* name = NULL; 1762 const Symbol* sig = NULL; 1763 { 1764 debug_only(NoSafepointVerifier nsv;) 1765 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1766 name = fs.name(); 1767 sig = fs.signature(); 1768 // If no duplicates, add name/signature in hashtable names_and_sigs. 1769 if (!put_after_lookup(name, sig, names_and_sigs)) { 1770 dup = true; 1771 break; 1772 } 1773 } 1774 } 1775 if (dup) { 1776 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1777 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1778 } 1779 } 1780 } 1781 1782 1783 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1784 u4 code_length, 1785 u4 exception_table_length, 1786 TRAPS) { 1787 assert(cfs != NULL, "invariant"); 1788 1789 const unsafe_u2* const exception_table_start = cfs->current(); 1790 assert(exception_table_start != NULL, "null exception table"); 1791 1792 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1793 // end_pc, 1794 // handler_pc, 1795 // catch_type_index 1796 1797 // Will check legal target after parsing code array in verifier. 1798 if (_need_verify) { 1799 for (unsigned int i = 0; i < exception_table_length; i++) { 1800 const u2 start_pc = cfs->get_u2_fast(); 1801 const u2 end_pc = cfs->get_u2_fast(); 1802 const u2 handler_pc = cfs->get_u2_fast(); 1803 const u2 catch_type_index = cfs->get_u2_fast(); 1804 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1805 "Illegal exception table range in class file %s", 1806 CHECK_NULL); 1807 guarantee_property(handler_pc < code_length, 1808 "Illegal exception table handler in class file %s", 1809 CHECK_NULL); 1810 if (catch_type_index != 0) { 1811 guarantee_property(valid_klass_reference_at(catch_type_index), 1812 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1813 } 1814 } 1815 } else { 1816 cfs->skip_u2_fast(exception_table_length * 4); 1817 } 1818 return exception_table_start; 1819 } 1820 1821 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1822 u4 code_length, 1823 CompressedLineNumberWriteStream**const write_stream, 1824 TRAPS) { 1825 1826 const ClassFileStream* const cfs = _stream; 1827 unsigned int num_entries = cfs->get_u2(CHECK); 1828 1829 // Each entry is a u2 start_pc, and a u2 line_number 1830 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1831 1832 // Verify line number attribute and table length 1833 check_property( 1834 code_attribute_length == sizeof(u2) + length_in_bytes, 1835 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1836 1837 cfs->guarantee_more(length_in_bytes, CHECK); 1838 1839 if ((*write_stream) == NULL) { 1840 if (length_in_bytes > fixed_buffer_size) { 1841 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1842 } else { 1843 (*write_stream) = new CompressedLineNumberWriteStream( 1844 _linenumbertable_buffer, fixed_buffer_size); 1845 } 1846 } 1847 1848 while (num_entries-- > 0) { 1849 const u2 bci = cfs->get_u2_fast(); // start_pc 1850 const u2 line = cfs->get_u2_fast(); // line_number 1851 guarantee_property(bci < code_length, 1852 "Invalid pc in LineNumberTable in class file %s", CHECK); 1853 (*write_stream)->write_pair(bci, line); 1854 } 1855 } 1856 1857 1858 class LVT_Hash : public AllStatic { 1859 public: 1860 1861 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1862 /* 1863 * 3-tuple start_bci/length/slot has to be unique key, 1864 * so the following comparison seems to be redundant: 1865 * && elem->name_cp_index == entry->_elem->name_cp_index 1866 */ 1867 return (e0.start_bci == e1.start_bci && 1868 e0.length == e1.length && 1869 e0.name_cp_index == e1.name_cp_index && 1870 e0.slot == e1.slot); 1871 } 1872 1873 static unsigned int hash(LocalVariableTableElement const& e0) { 1874 unsigned int raw_hash = e0.start_bci; 1875 1876 raw_hash = e0.length + raw_hash * 37; 1877 raw_hash = e0.name_cp_index + raw_hash * 37; 1878 raw_hash = e0.slot + raw_hash * 37; 1879 1880 return raw_hash; 1881 } 1882 }; 1883 1884 1885 // Class file LocalVariableTable elements. 1886 class Classfile_LVT_Element { 1887 public: 1888 u2 start_bci; 1889 u2 length; 1890 u2 name_cp_index; 1891 u2 descriptor_cp_index; 1892 u2 slot; 1893 }; 1894 1895 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1896 LocalVariableTableElement* const lvt) { 1897 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1898 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1899 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1900 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1901 lvt->signature_cp_index = 0; 1902 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1903 } 1904 1905 // Function is used to parse both attributes: 1906 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1907 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1908 u4 code_length, 1909 u2 max_locals, 1910 u4 code_attribute_length, 1911 u2* const localvariable_table_length, 1912 bool isLVTT, 1913 TRAPS) { 1914 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1915 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1916 const unsigned int size = 1917 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1918 1919 const ConstantPool* const cp = _cp; 1920 1921 // Verify local variable table attribute has right length 1922 if (_need_verify) { 1923 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1924 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1925 } 1926 1927 const unsafe_u2* const localvariable_table_start = cfs->current(); 1928 assert(localvariable_table_start != NULL, "null local variable table"); 1929 if (!_need_verify) { 1930 cfs->skip_u2_fast(size); 1931 } else { 1932 cfs->guarantee_more(size * 2, CHECK_NULL); 1933 for(int i = 0; i < (*localvariable_table_length); i++) { 1934 const u2 start_pc = cfs->get_u2_fast(); 1935 const u2 length = cfs->get_u2_fast(); 1936 const u2 name_index = cfs->get_u2_fast(); 1937 const u2 descriptor_index = cfs->get_u2_fast(); 1938 const u2 index = cfs->get_u2_fast(); 1939 // Assign to a u4 to avoid overflow 1940 const u4 end_pc = (u4)start_pc + (u4)length; 1941 1942 if (start_pc >= code_length) { 1943 classfile_parse_error( 1944 "Invalid start_pc %u in %s in class file %s", 1945 start_pc, tbl_name, CHECK_NULL); 1946 } 1947 if (end_pc > code_length) { 1948 classfile_parse_error( 1949 "Invalid length %u in %s in class file %s", 1950 length, tbl_name, CHECK_NULL); 1951 } 1952 const int cp_size = cp->length(); 1953 guarantee_property(valid_symbol_at(name_index), 1954 "Name index %u in %s has bad constant type in class file %s", 1955 name_index, tbl_name, CHECK_NULL); 1956 guarantee_property(valid_symbol_at(descriptor_index), 1957 "Signature index %u in %s has bad constant type in class file %s", 1958 descriptor_index, tbl_name, CHECK_NULL); 1959 1960 const Symbol* const name = cp->symbol_at(name_index); 1961 const Symbol* const sig = cp->symbol_at(descriptor_index); 1962 verify_legal_field_name(name, CHECK_NULL); 1963 u2 extra_slot = 0; 1964 if (!isLVTT) { 1965 verify_legal_field_signature(name, sig, CHECK_NULL); 1966 1967 // 4894874: check special cases for double and long local variables 1968 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1969 sig == vmSymbols::type_signature(T_LONG)) { 1970 extra_slot = 1; 1971 } 1972 } 1973 guarantee_property((index + extra_slot) < max_locals, 1974 "Invalid index %u in %s in class file %s", 1975 index, tbl_name, CHECK_NULL); 1976 } 1977 } 1978 return localvariable_table_start; 1979 } 1980 1981 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 1982 u4 code_attribute_length, 1983 bool need_verify, 1984 TRAPS) { 1985 assert(cfs != NULL, "invariant"); 1986 1987 if (0 == code_attribute_length) { 1988 return NULL; 1989 } 1990 1991 const u1* const stackmap_table_start = cfs->current(); 1992 assert(stackmap_table_start != NULL, "null stackmap table"); 1993 1994 // check code_attribute_length first 1995 cfs->skip_u1(code_attribute_length, CHECK_NULL); 1996 1997 if (!need_verify && !DumpSharedSpaces) { 1998 return NULL; 1999 } 2000 return stackmap_table_start; 2001 } 2002 2003 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2004 u2* const checked_exceptions_length, 2005 u4 method_attribute_length, 2006 TRAPS) { 2007 assert(cfs != NULL, "invariant"); 2008 assert(checked_exceptions_length != NULL, "invariant"); 2009 2010 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2011 *checked_exceptions_length = cfs->get_u2_fast(); 2012 const unsigned int size = 2013 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2014 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2015 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2016 if (!_need_verify) { 2017 cfs->skip_u2_fast(size); 2018 } else { 2019 // Verify each value in the checked exception table 2020 u2 checked_exception; 2021 const u2 len = *checked_exceptions_length; 2022 cfs->guarantee_more(2 * len, CHECK_NULL); 2023 for (int i = 0; i < len; i++) { 2024 checked_exception = cfs->get_u2_fast(); 2025 check_property( 2026 valid_klass_reference_at(checked_exception), 2027 "Exception name has bad type at constant pool %u in class file %s", 2028 checked_exception, CHECK_NULL); 2029 } 2030 } 2031 // check exceptions attribute length 2032 if (_need_verify) { 2033 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2034 sizeof(u2) * size), 2035 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2036 } 2037 return checked_exceptions_start; 2038 } 2039 2040 void ClassFileParser::throwIllegalSignature(const char* type, 2041 const Symbol* name, 2042 const Symbol* sig, 2043 TRAPS) const { 2044 assert(name != NULL, "invariant"); 2045 assert(sig != NULL, "invariant"); 2046 2047 ResourceMark rm(THREAD); 2048 Exceptions::fthrow(THREAD_AND_LOCATION, 2049 vmSymbols::java_lang_ClassFormatError(), 2050 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2051 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2052 } 2053 2054 AnnotationCollector::ID 2055 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2056 const Symbol* name) { 2057 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2058 // Privileged code can use all annotations. Other code silently drops some. 2059 const bool privileged = loader_data->is_the_null_class_loader_data() || 2060 loader_data->is_platform_class_loader_data() || 2061 loader_data->is_unsafe_anonymous(); 2062 switch (sid) { 2063 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2064 if (_location != _in_method) break; // only allow for methods 2065 if (!privileged) break; // only allow in privileged code 2066 return _method_CallerSensitive; 2067 } 2068 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2069 if (_location != _in_method) break; // only allow for methods 2070 if (!privileged) break; // only allow in privileged code 2071 return _method_ForceInline; 2072 } 2073 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2074 if (_location != _in_method) break; // only allow for methods 2075 if (!privileged) break; // only allow in privileged code 2076 return _method_DontInline; 2077 } 2078 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2079 if (_location != _in_method) break; // only allow for methods 2080 if (!privileged) break; // only allow in privileged code 2081 return _method_InjectedProfile; 2082 } 2083 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2084 if (_location != _in_method) break; // only allow for methods 2085 if (!privileged) break; // only allow in privileged code 2086 return _method_LambdaForm_Compiled; 2087 } 2088 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { 2089 if (_location != _in_method) break; // only allow for methods 2090 if (!privileged) break; // only allow in privileged code 2091 return _method_Hidden; 2092 } 2093 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2094 if (_location != _in_method) break; // only allow for methods 2095 if (!privileged) break; // only allow in privileged code 2096 return _method_HotSpotIntrinsicCandidate; 2097 } 2098 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2099 if (_location != _in_field) break; // only allow for fields 2100 if (!privileged) break; // only allow in privileged code 2101 return _field_Stable; 2102 } 2103 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2104 if (_location != _in_field && _location != _in_class) { 2105 break; // only allow for fields and classes 2106 } 2107 if (!EnableContended || (RestrictContended && !privileged)) { 2108 break; // honor privileges 2109 } 2110 return _jdk_internal_vm_annotation_Contended; 2111 } 2112 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2113 if (_location != _in_method) break; // only allow for methods 2114 if (RestrictReservedStack && !privileged) break; // honor privileges 2115 return _jdk_internal_vm_annotation_ReservedStackAccess; 2116 } 2117 default: { 2118 break; 2119 } 2120 } 2121 return AnnotationCollector::_unknown; 2122 } 2123 2124 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2125 if (is_contended()) 2126 f->set_contended_group(contended_group()); 2127 if (is_stable()) 2128 f->set_stable(true); 2129 } 2130 2131 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2132 // If there's an error deallocate metadata for field annotations 2133 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2134 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2135 } 2136 2137 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2138 if (has_annotation(_method_CallerSensitive)) 2139 m->set_caller_sensitive(true); 2140 if (has_annotation(_method_ForceInline)) 2141 m->set_force_inline(true); 2142 if (has_annotation(_method_DontInline)) 2143 m->set_dont_inline(true); 2144 if (has_annotation(_method_InjectedProfile)) 2145 m->set_has_injected_profile(true); 2146 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2147 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2148 if (has_annotation(_method_Hidden)) 2149 m->set_hidden(true); 2150 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2151 m->set_intrinsic_candidate(true); 2152 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2153 m->set_has_reserved_stack_access(true); 2154 } 2155 2156 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2157 assert(ik != NULL, "invariant"); 2158 ik->set_is_contended(is_contended()); 2159 } 2160 2161 #define MAX_ARGS_SIZE 255 2162 #define MAX_CODE_SIZE 65535 2163 #define INITIAL_MAX_LVT_NUMBER 256 2164 2165 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2166 * 2167 * Rules for LVT's and LVTT's are: 2168 * - There can be any number of LVT's and LVTT's. 2169 * - If there are n LVT's, it is the same as if there was just 2170 * one LVT containing all the entries from the n LVT's. 2171 * - There may be no more than one LVT entry per local variable. 2172 * Two LVT entries are 'equal' if these fields are the same: 2173 * start_pc, length, name, slot 2174 * - There may be no more than one LVTT entry per each LVT entry. 2175 * Each LVTT entry has to match some LVT entry. 2176 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2177 */ 2178 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2179 int lvt_cnt, 2180 u2* const localvariable_table_length, 2181 const unsafe_u2** const localvariable_table_start, 2182 int lvtt_cnt, 2183 u2* const localvariable_type_table_length, 2184 const unsafe_u2** const localvariable_type_table_start, 2185 TRAPS) { 2186 2187 ResourceMark rm(THREAD); 2188 2189 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2190 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2191 2192 LVT_HashTable* const table = new LVT_HashTable(); 2193 2194 // To fill LocalVariableTable in 2195 const Classfile_LVT_Element* cf_lvt; 2196 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2197 2198 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2199 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2200 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2201 copy_lvt_element(&cf_lvt[idx], lvt); 2202 // If no duplicates, add LVT elem in hashtable. 2203 if (table->put(*lvt, lvt) == false 2204 && _need_verify 2205 && _major_version >= JAVA_1_5_VERSION) { 2206 classfile_parse_error("Duplicated LocalVariableTable attribute " 2207 "entry for '%s' in class file %s", 2208 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2209 CHECK); 2210 } 2211 } 2212 } 2213 2214 // To merge LocalVariableTable and LocalVariableTypeTable 2215 const Classfile_LVT_Element* cf_lvtt; 2216 LocalVariableTableElement lvtt_elem; 2217 2218 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2219 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2220 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2221 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2222 LocalVariableTableElement** entry = table->get(lvtt_elem); 2223 if (entry == NULL) { 2224 if (_need_verify) { 2225 classfile_parse_error("LVTT entry for '%s' in class file %s " 2226 "does not match any LVT entry", 2227 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2228 CHECK); 2229 } 2230 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2231 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2232 "entry for '%s' in class file %s", 2233 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2234 CHECK); 2235 } else { 2236 // to add generic signatures into LocalVariableTable 2237 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2238 } 2239 } 2240 } 2241 } 2242 2243 2244 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2245 const u1* runtime_visible_annotations, 2246 int runtime_visible_annotations_length, 2247 const u1* runtime_invisible_annotations, 2248 int runtime_invisible_annotations_length, 2249 const u1* runtime_visible_parameter_annotations, 2250 int runtime_visible_parameter_annotations_length, 2251 const u1* runtime_invisible_parameter_annotations, 2252 int runtime_invisible_parameter_annotations_length, 2253 const u1* runtime_visible_type_annotations, 2254 int runtime_visible_type_annotations_length, 2255 const u1* runtime_invisible_type_annotations, 2256 int runtime_invisible_type_annotations_length, 2257 const u1* annotation_default, 2258 int annotation_default_length, 2259 TRAPS) { 2260 2261 AnnotationArray* a; 2262 2263 if (runtime_visible_annotations_length + 2264 runtime_invisible_annotations_length > 0) { 2265 a = assemble_annotations(runtime_visible_annotations, 2266 runtime_visible_annotations_length, 2267 runtime_invisible_annotations, 2268 runtime_invisible_annotations_length, 2269 CHECK); 2270 cm->set_method_annotations(a); 2271 } 2272 2273 if (runtime_visible_parameter_annotations_length + 2274 runtime_invisible_parameter_annotations_length > 0) { 2275 a = assemble_annotations(runtime_visible_parameter_annotations, 2276 runtime_visible_parameter_annotations_length, 2277 runtime_invisible_parameter_annotations, 2278 runtime_invisible_parameter_annotations_length, 2279 CHECK); 2280 cm->set_parameter_annotations(a); 2281 } 2282 2283 if (annotation_default_length > 0) { 2284 a = assemble_annotations(annotation_default, 2285 annotation_default_length, 2286 NULL, 2287 0, 2288 CHECK); 2289 cm->set_default_annotations(a); 2290 } 2291 2292 if (runtime_visible_type_annotations_length + 2293 runtime_invisible_type_annotations_length > 0) { 2294 a = assemble_annotations(runtime_visible_type_annotations, 2295 runtime_visible_type_annotations_length, 2296 runtime_invisible_type_annotations, 2297 runtime_invisible_type_annotations_length, 2298 CHECK); 2299 cm->set_type_annotations(a); 2300 } 2301 } 2302 2303 2304 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2305 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2306 // Method* to save footprint, so we only know the size of the resulting Method* when the 2307 // entire method attribute is parsed. 2308 // 2309 // The promoted_flags parameter is used to pass relevant access_flags 2310 // from the method back up to the containing klass. These flag values 2311 // are added to klass's access_flags. 2312 2313 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2314 bool is_interface, 2315 const ConstantPool* cp, 2316 AccessFlags* const promoted_flags, 2317 TRAPS) { 2318 assert(cfs != NULL, "invariant"); 2319 assert(cp != NULL, "invariant"); 2320 assert(promoted_flags != NULL, "invariant"); 2321 2322 ResourceMark rm(THREAD); 2323 // Parse fixed parts: 2324 // access_flags, name_index, descriptor_index, attributes_count 2325 cfs->guarantee_more(8, CHECK_NULL); 2326 2327 int flags = cfs->get_u2_fast(); 2328 const u2 name_index = cfs->get_u2_fast(); 2329 const int cp_size = cp->length(); 2330 check_property( 2331 valid_symbol_at(name_index), 2332 "Illegal constant pool index %u for method name in class file %s", 2333 name_index, CHECK_NULL); 2334 const Symbol* const name = cp->symbol_at(name_index); 2335 verify_legal_method_name(name, CHECK_NULL); 2336 2337 const u2 signature_index = cfs->get_u2_fast(); 2338 guarantee_property( 2339 valid_symbol_at(signature_index), 2340 "Illegal constant pool index %u for method signature in class file %s", 2341 signature_index, CHECK_NULL); 2342 const Symbol* const signature = cp->symbol_at(signature_index); 2343 2344 if (name == vmSymbols::class_initializer_name()) { 2345 // We ignore the other access flags for a valid class initializer. 2346 // (JVM Spec 2nd ed., chapter 4.6) 2347 if (_major_version < 51) { // backward compatibility 2348 flags = JVM_ACC_STATIC; 2349 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2350 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2351 } else { 2352 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2353 } 2354 } else { 2355 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2356 } 2357 2358 if (name == vmSymbols::object_initializer_name() && is_interface) { 2359 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2360 } 2361 2362 int args_size = -1; // only used when _need_verify is true 2363 if (_need_verify) { 2364 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2365 verify_legal_method_signature(name, signature, CHECK_NULL); 2366 if (args_size > MAX_ARGS_SIZE) { 2367 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2368 } 2369 } 2370 2371 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2372 2373 // Default values for code and exceptions attribute elements 2374 u2 max_stack = 0; 2375 u2 max_locals = 0; 2376 u4 code_length = 0; 2377 const u1* code_start = 0; 2378 u2 exception_table_length = 0; 2379 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2380 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2381 u2 checked_exceptions_length = 0; 2382 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2383 CompressedLineNumberWriteStream* linenumber_table = NULL; 2384 int linenumber_table_length = 0; 2385 int total_lvt_length = 0; 2386 u2 lvt_cnt = 0; 2387 u2 lvtt_cnt = 0; 2388 bool lvt_allocated = false; 2389 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2390 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2391 u2* localvariable_table_length = NULL; 2392 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2393 u2* localvariable_type_table_length = NULL; 2394 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2395 int method_parameters_length = -1; 2396 const u1* method_parameters_data = NULL; 2397 bool method_parameters_seen = false; 2398 bool parsed_code_attribute = false; 2399 bool parsed_checked_exceptions_attribute = false; 2400 bool parsed_stackmap_attribute = false; 2401 // stackmap attribute - JDK1.5 2402 const u1* stackmap_data = NULL; 2403 int stackmap_data_length = 0; 2404 u2 generic_signature_index = 0; 2405 MethodAnnotationCollector parsed_annotations; 2406 const u1* runtime_visible_annotations = NULL; 2407 int runtime_visible_annotations_length = 0; 2408 const u1* runtime_invisible_annotations = NULL; 2409 int runtime_invisible_annotations_length = 0; 2410 const u1* runtime_visible_parameter_annotations = NULL; 2411 int runtime_visible_parameter_annotations_length = 0; 2412 const u1* runtime_invisible_parameter_annotations = NULL; 2413 int runtime_invisible_parameter_annotations_length = 0; 2414 const u1* runtime_visible_type_annotations = NULL; 2415 int runtime_visible_type_annotations_length = 0; 2416 const u1* runtime_invisible_type_annotations = NULL; 2417 int runtime_invisible_type_annotations_length = 0; 2418 bool runtime_invisible_annotations_exists = false; 2419 bool runtime_invisible_type_annotations_exists = false; 2420 bool runtime_invisible_parameter_annotations_exists = false; 2421 const u1* annotation_default = NULL; 2422 int annotation_default_length = 0; 2423 2424 // Parse code and exceptions attribute 2425 u2 method_attributes_count = cfs->get_u2_fast(); 2426 while (method_attributes_count--) { 2427 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2428 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2429 const u4 method_attribute_length = cfs->get_u4_fast(); 2430 check_property( 2431 valid_symbol_at(method_attribute_name_index), 2432 "Invalid method attribute name index %u in class file %s", 2433 method_attribute_name_index, CHECK_NULL); 2434 2435 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2436 if (method_attribute_name == vmSymbols::tag_code()) { 2437 // Parse Code attribute 2438 if (_need_verify) { 2439 guarantee_property( 2440 !access_flags.is_native() && !access_flags.is_abstract(), 2441 "Code attribute in native or abstract methods in class file %s", 2442 CHECK_NULL); 2443 } 2444 if (parsed_code_attribute) { 2445 classfile_parse_error("Multiple Code attributes in class file %s", 2446 CHECK_NULL); 2447 } 2448 parsed_code_attribute = true; 2449 2450 // Stack size, locals size, and code size 2451 if (_major_version == 45 && _minor_version <= 2) { 2452 cfs->guarantee_more(4, CHECK_NULL); 2453 max_stack = cfs->get_u1_fast(); 2454 max_locals = cfs->get_u1_fast(); 2455 code_length = cfs->get_u2_fast(); 2456 } else { 2457 cfs->guarantee_more(8, CHECK_NULL); 2458 max_stack = cfs->get_u2_fast(); 2459 max_locals = cfs->get_u2_fast(); 2460 code_length = cfs->get_u4_fast(); 2461 } 2462 if (_need_verify) { 2463 guarantee_property(args_size <= max_locals, 2464 "Arguments can't fit into locals in class file %s", 2465 CHECK_NULL); 2466 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2467 "Invalid method Code length %u in class file %s", 2468 code_length, CHECK_NULL); 2469 } 2470 // Code pointer 2471 code_start = cfs->current(); 2472 assert(code_start != NULL, "null code start"); 2473 cfs->guarantee_more(code_length, CHECK_NULL); 2474 cfs->skip_u1_fast(code_length); 2475 2476 // Exception handler table 2477 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2478 exception_table_length = cfs->get_u2_fast(); 2479 if (exception_table_length > 0) { 2480 exception_table_start = parse_exception_table(cfs, 2481 code_length, 2482 exception_table_length, 2483 CHECK_NULL); 2484 } 2485 2486 // Parse additional attributes in code attribute 2487 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2488 u2 code_attributes_count = cfs->get_u2_fast(); 2489 2490 unsigned int calculated_attribute_length = 0; 2491 2492 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2493 calculated_attribute_length = 2494 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2495 } else { 2496 // max_stack, locals and length are smaller in pre-version 45.2 classes 2497 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2498 } 2499 calculated_attribute_length += 2500 code_length + 2501 sizeof(exception_table_length) + 2502 sizeof(code_attributes_count) + 2503 exception_table_length * 2504 ( sizeof(u2) + // start_pc 2505 sizeof(u2) + // end_pc 2506 sizeof(u2) + // handler_pc 2507 sizeof(u2) ); // catch_type_index 2508 2509 while (code_attributes_count--) { 2510 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2511 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2512 const u4 code_attribute_length = cfs->get_u4_fast(); 2513 calculated_attribute_length += code_attribute_length + 2514 sizeof(code_attribute_name_index) + 2515 sizeof(code_attribute_length); 2516 check_property(valid_symbol_at(code_attribute_name_index), 2517 "Invalid code attribute name index %u in class file %s", 2518 code_attribute_name_index, 2519 CHECK_NULL); 2520 if (LoadLineNumberTables && 2521 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2522 // Parse and compress line number table 2523 parse_linenumber_table(code_attribute_length, 2524 code_length, 2525 &linenumber_table, 2526 CHECK_NULL); 2527 2528 } else if (LoadLocalVariableTables && 2529 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2530 // Parse local variable table 2531 if (!lvt_allocated) { 2532 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2533 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2534 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2535 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2536 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2537 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2538 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2539 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2540 lvt_allocated = true; 2541 } 2542 if (lvt_cnt == max_lvt_cnt) { 2543 max_lvt_cnt <<= 1; 2544 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2545 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2546 } 2547 localvariable_table_start[lvt_cnt] = 2548 parse_localvariable_table(cfs, 2549 code_length, 2550 max_locals, 2551 code_attribute_length, 2552 &localvariable_table_length[lvt_cnt], 2553 false, // is not LVTT 2554 CHECK_NULL); 2555 total_lvt_length += localvariable_table_length[lvt_cnt]; 2556 lvt_cnt++; 2557 } else if (LoadLocalVariableTypeTables && 2558 _major_version >= JAVA_1_5_VERSION && 2559 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2560 if (!lvt_allocated) { 2561 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2562 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2563 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2564 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2565 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2566 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2567 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2568 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2569 lvt_allocated = true; 2570 } 2571 // Parse local variable type table 2572 if (lvtt_cnt == max_lvtt_cnt) { 2573 max_lvtt_cnt <<= 1; 2574 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2575 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2576 } 2577 localvariable_type_table_start[lvtt_cnt] = 2578 parse_localvariable_table(cfs, 2579 code_length, 2580 max_locals, 2581 code_attribute_length, 2582 &localvariable_type_table_length[lvtt_cnt], 2583 true, // is LVTT 2584 CHECK_NULL); 2585 lvtt_cnt++; 2586 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2587 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2588 // Stack map is only needed by the new verifier in JDK1.5. 2589 if (parsed_stackmap_attribute) { 2590 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2591 } 2592 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2593 stackmap_data_length = code_attribute_length; 2594 parsed_stackmap_attribute = true; 2595 } else { 2596 // Skip unknown attributes 2597 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2598 } 2599 } 2600 // check method attribute length 2601 if (_need_verify) { 2602 guarantee_property(method_attribute_length == calculated_attribute_length, 2603 "Code segment has wrong length in class file %s", 2604 CHECK_NULL); 2605 } 2606 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2607 // Parse Exceptions attribute 2608 if (parsed_checked_exceptions_attribute) { 2609 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2610 CHECK_NULL); 2611 } 2612 parsed_checked_exceptions_attribute = true; 2613 checked_exceptions_start = 2614 parse_checked_exceptions(cfs, 2615 &checked_exceptions_length, 2616 method_attribute_length, 2617 CHECK_NULL); 2618 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2619 // reject multiple method parameters 2620 if (method_parameters_seen) { 2621 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2622 CHECK_NULL); 2623 } 2624 method_parameters_seen = true; 2625 method_parameters_length = cfs->get_u1_fast(); 2626 const u2 real_length = (method_parameters_length * 4u) + 1u; 2627 if (method_attribute_length != real_length) { 2628 classfile_parse_error( 2629 "Invalid MethodParameters method attribute length %u in class file", 2630 method_attribute_length, CHECK_NULL); 2631 } 2632 method_parameters_data = cfs->current(); 2633 cfs->skip_u2_fast(method_parameters_length); 2634 cfs->skip_u2_fast(method_parameters_length); 2635 // ignore this attribute if it cannot be reflected 2636 if (!SystemDictionary::Parameter_klass_loaded()) 2637 method_parameters_length = -1; 2638 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2639 if (method_attribute_length != 0) { 2640 classfile_parse_error( 2641 "Invalid Synthetic method attribute length %u in class file %s", 2642 method_attribute_length, CHECK_NULL); 2643 } 2644 // Should we check that there hasn't already been a synthetic attribute? 2645 access_flags.set_is_synthetic(); 2646 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2647 if (method_attribute_length != 0) { 2648 classfile_parse_error( 2649 "Invalid Deprecated method attribute length %u in class file %s", 2650 method_attribute_length, CHECK_NULL); 2651 } 2652 } else if (_major_version >= JAVA_1_5_VERSION) { 2653 if (method_attribute_name == vmSymbols::tag_signature()) { 2654 if (generic_signature_index != 0) { 2655 classfile_parse_error( 2656 "Multiple Signature attributes for method in class file %s", 2657 CHECK_NULL); 2658 } 2659 if (method_attribute_length != 2) { 2660 classfile_parse_error( 2661 "Invalid Signature attribute length %u in class file %s", 2662 method_attribute_length, CHECK_NULL); 2663 } 2664 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2665 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2666 if (runtime_visible_annotations != NULL) { 2667 classfile_parse_error( 2668 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2669 CHECK_NULL); 2670 } 2671 runtime_visible_annotations_length = method_attribute_length; 2672 runtime_visible_annotations = cfs->current(); 2673 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2674 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2675 parse_annotations(cp, 2676 runtime_visible_annotations, 2677 runtime_visible_annotations_length, 2678 &parsed_annotations, 2679 _loader_data, 2680 CHECK_NULL); 2681 cfs->skip_u1_fast(runtime_visible_annotations_length); 2682 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2683 if (runtime_invisible_annotations_exists) { 2684 classfile_parse_error( 2685 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2686 CHECK_NULL); 2687 } 2688 runtime_invisible_annotations_exists = true; 2689 if (PreserveAllAnnotations) { 2690 runtime_invisible_annotations_length = method_attribute_length; 2691 runtime_invisible_annotations = cfs->current(); 2692 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2693 } 2694 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2695 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2696 if (runtime_visible_parameter_annotations != NULL) { 2697 classfile_parse_error( 2698 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2699 CHECK_NULL); 2700 } 2701 runtime_visible_parameter_annotations_length = method_attribute_length; 2702 runtime_visible_parameter_annotations = cfs->current(); 2703 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2704 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2705 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2706 if (runtime_invisible_parameter_annotations_exists) { 2707 classfile_parse_error( 2708 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2709 CHECK_NULL); 2710 } 2711 runtime_invisible_parameter_annotations_exists = true; 2712 if (PreserveAllAnnotations) { 2713 runtime_invisible_parameter_annotations_length = method_attribute_length; 2714 runtime_invisible_parameter_annotations = cfs->current(); 2715 assert(runtime_invisible_parameter_annotations != NULL, 2716 "null invisible parameter annotations"); 2717 } 2718 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2719 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2720 if (annotation_default != NULL) { 2721 classfile_parse_error( 2722 "Multiple AnnotationDefault attributes for method in class file %s", 2723 CHECK_NULL); 2724 } 2725 annotation_default_length = method_attribute_length; 2726 annotation_default = cfs->current(); 2727 assert(annotation_default != NULL, "null annotation default"); 2728 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2729 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2730 if (runtime_visible_type_annotations != NULL) { 2731 classfile_parse_error( 2732 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2733 CHECK_NULL); 2734 } 2735 runtime_visible_type_annotations_length = method_attribute_length; 2736 runtime_visible_type_annotations = cfs->current(); 2737 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2738 // No need for the VM to parse Type annotations 2739 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2740 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2741 if (runtime_invisible_type_annotations_exists) { 2742 classfile_parse_error( 2743 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2744 CHECK_NULL); 2745 } else { 2746 runtime_invisible_type_annotations_exists = true; 2747 } 2748 if (PreserveAllAnnotations) { 2749 runtime_invisible_type_annotations_length = method_attribute_length; 2750 runtime_invisible_type_annotations = cfs->current(); 2751 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2752 } 2753 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2754 } else { 2755 // Skip unknown attributes 2756 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2757 } 2758 } else { 2759 // Skip unknown attributes 2760 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2761 } 2762 } 2763 2764 if (linenumber_table != NULL) { 2765 linenumber_table->write_terminator(); 2766 linenumber_table_length = linenumber_table->position(); 2767 } 2768 2769 // Make sure there's at least one Code attribute in non-native/non-abstract method 2770 if (_need_verify) { 2771 guarantee_property(access_flags.is_native() || 2772 access_flags.is_abstract() || 2773 parsed_code_attribute, 2774 "Absent Code attribute in method that is not native or abstract in class file %s", 2775 CHECK_NULL); 2776 } 2777 2778 // All sizing information for a Method* is finally available, now create it 2779 InlineTableSizes sizes( 2780 total_lvt_length, 2781 linenumber_table_length, 2782 exception_table_length, 2783 checked_exceptions_length, 2784 method_parameters_length, 2785 generic_signature_index, 2786 runtime_visible_annotations_length + 2787 runtime_invisible_annotations_length, 2788 runtime_visible_parameter_annotations_length + 2789 runtime_invisible_parameter_annotations_length, 2790 runtime_visible_type_annotations_length + 2791 runtime_invisible_type_annotations_length, 2792 annotation_default_length, 2793 0); 2794 2795 Method* const m = Method::allocate(_loader_data, 2796 code_length, 2797 access_flags, 2798 &sizes, 2799 ConstMethod::NORMAL, 2800 CHECK_NULL); 2801 2802 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2803 2804 // Fill in information from fixed part (access_flags already set) 2805 m->set_constants(_cp); 2806 m->set_name_index(name_index); 2807 m->set_signature_index(signature_index); 2808 2809 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 2810 m->constMethod()->set_result_type(rtf.type()); 2811 2812 if (args_size >= 0) { 2813 m->set_size_of_parameters(args_size); 2814 } else { 2815 m->compute_size_of_parameters(THREAD); 2816 } 2817 #ifdef ASSERT 2818 if (args_size >= 0) { 2819 m->compute_size_of_parameters(THREAD); 2820 assert(args_size == m->size_of_parameters(), ""); 2821 } 2822 #endif 2823 2824 // Fill in code attribute information 2825 m->set_max_stack(max_stack); 2826 m->set_max_locals(max_locals); 2827 if (stackmap_data != NULL) { 2828 m->constMethod()->copy_stackmap_data(_loader_data, 2829 (u1*)stackmap_data, 2830 stackmap_data_length, 2831 CHECK_NULL); 2832 } 2833 2834 // Copy byte codes 2835 m->set_code((u1*)code_start); 2836 2837 // Copy line number table 2838 if (linenumber_table != NULL) { 2839 memcpy(m->compressed_linenumber_table(), 2840 linenumber_table->buffer(), 2841 linenumber_table_length); 2842 } 2843 2844 // Copy exception table 2845 if (exception_table_length > 0) { 2846 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2847 m->exception_table_start(), 2848 exception_table_length * sizeof(ExceptionTableElement), 2849 sizeof(u2)); 2850 } 2851 2852 // Copy method parameters 2853 if (method_parameters_length > 0) { 2854 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2855 for (int i = 0; i < method_parameters_length; i++) { 2856 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2857 method_parameters_data += 2; 2858 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2859 method_parameters_data += 2; 2860 } 2861 } 2862 2863 // Copy checked exceptions 2864 if (checked_exceptions_length > 0) { 2865 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2866 m->checked_exceptions_start(), 2867 checked_exceptions_length * sizeof(CheckedExceptionElement), 2868 sizeof(u2)); 2869 } 2870 2871 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2872 if (total_lvt_length > 0) { 2873 promoted_flags->set_has_localvariable_table(); 2874 copy_localvariable_table(m->constMethod(), 2875 lvt_cnt, 2876 localvariable_table_length, 2877 localvariable_table_start, 2878 lvtt_cnt, 2879 localvariable_type_table_length, 2880 localvariable_type_table_start, 2881 CHECK_NULL); 2882 } 2883 2884 if (parsed_annotations.has_any_annotations()) 2885 parsed_annotations.apply_to(m); 2886 2887 // Copy annotations 2888 copy_method_annotations(m->constMethod(), 2889 runtime_visible_annotations, 2890 runtime_visible_annotations_length, 2891 runtime_invisible_annotations, 2892 runtime_invisible_annotations_length, 2893 runtime_visible_parameter_annotations, 2894 runtime_visible_parameter_annotations_length, 2895 runtime_invisible_parameter_annotations, 2896 runtime_invisible_parameter_annotations_length, 2897 runtime_visible_type_annotations, 2898 runtime_visible_type_annotations_length, 2899 runtime_invisible_type_annotations, 2900 runtime_invisible_type_annotations_length, 2901 annotation_default, 2902 annotation_default_length, 2903 CHECK_NULL); 2904 2905 if (name == vmSymbols::finalize_method_name() && 2906 signature == vmSymbols::void_method_signature()) { 2907 if (m->is_empty_method()) { 2908 _has_empty_finalizer = true; 2909 } else { 2910 _has_finalizer = true; 2911 } 2912 } 2913 if (name == vmSymbols::object_initializer_name() && 2914 signature == vmSymbols::void_method_signature() && 2915 m->is_vanilla_constructor()) { 2916 _has_vanilla_constructor = true; 2917 } 2918 2919 NOT_PRODUCT(m->verify()); 2920 return m; 2921 } 2922 2923 2924 // The promoted_flags parameter is used to pass relevant access_flags 2925 // from the methods back up to the containing klass. These flag values 2926 // are added to klass's access_flags. 2927 // Side-effects: populates the _methods field in the parser 2928 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2929 bool is_interface, 2930 AccessFlags* promoted_flags, 2931 bool* has_final_method, 2932 bool* declares_nonstatic_concrete_methods, 2933 TRAPS) { 2934 assert(cfs != NULL, "invariant"); 2935 assert(promoted_flags != NULL, "invariant"); 2936 assert(has_final_method != NULL, "invariant"); 2937 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 2938 2939 assert(NULL == _methods, "invariant"); 2940 2941 cfs->guarantee_more(2, CHECK); // length 2942 const u2 length = cfs->get_u2_fast(); 2943 if (length == 0) { 2944 _methods = Universe::the_empty_method_array(); 2945 } else { 2946 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2947 length, 2948 NULL, 2949 CHECK); 2950 2951 for (int index = 0; index < length; index++) { 2952 Method* method = parse_method(cfs, 2953 is_interface, 2954 _cp, 2955 promoted_flags, 2956 CHECK); 2957 2958 if (method->is_final()) { 2959 *has_final_method = true; 2960 } 2961 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2962 // used for interface initialization, and default method inheritance analysis 2963 if (is_interface && !(*declares_nonstatic_concrete_methods) 2964 && !method->is_abstract() && !method->is_static()) { 2965 *declares_nonstatic_concrete_methods = true; 2966 } 2967 _methods->at_put(index, method); 2968 } 2969 2970 if (_need_verify && length > 1) { 2971 // Check duplicated methods 2972 ResourceMark rm(THREAD); 2973 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2974 THREAD, NameSigHash*, HASH_ROW_SIZE); 2975 initialize_hashtable(names_and_sigs); 2976 bool dup = false; 2977 const Symbol* name = NULL; 2978 const Symbol* sig = NULL; 2979 { 2980 debug_only(NoSafepointVerifier nsv;) 2981 for (int i = 0; i < length; i++) { 2982 const Method* const m = _methods->at(i); 2983 name = m->name(); 2984 sig = m->signature(); 2985 // If no duplicates, add name/signature in hashtable names_and_sigs. 2986 if (!put_after_lookup(name, sig, names_and_sigs)) { 2987 dup = true; 2988 break; 2989 } 2990 } 2991 } 2992 if (dup) { 2993 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2994 name->as_C_string(), sig->as_klass_external_name(), CHECK); 2995 } 2996 } 2997 } 2998 } 2999 3000 static const intArray* sort_methods(Array<Method*>* methods) { 3001 const int length = methods->length(); 3002 // If JVMTI original method ordering or sharing is enabled we have to 3003 // remember the original class file ordering. 3004 // We temporarily use the vtable_index field in the Method* to store the 3005 // class file index, so we can read in after calling qsort. 3006 // Put the method ordering in the shared archive. 3007 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 3008 for (int index = 0; index < length; index++) { 3009 Method* const m = methods->at(index); 3010 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3011 m->set_vtable_index(index); 3012 } 3013 } 3014 // Sort method array by ascending method name (for faster lookups & vtable construction) 3015 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3016 Method::sort_methods(methods); 3017 3018 intArray* method_ordering = NULL; 3019 // If JVMTI original method ordering or sharing is enabled construct int 3020 // array remembering the original ordering 3021 if (JvmtiExport::can_maintain_original_method_order() || Arguments::is_dumping_archive()) { 3022 method_ordering = new intArray(length, length, -1); 3023 for (int index = 0; index < length; index++) { 3024 Method* const m = methods->at(index); 3025 const int old_index = m->vtable_index(); 3026 assert(old_index >= 0 && old_index < length, "invalid method index"); 3027 method_ordering->at_put(index, old_index); 3028 m->set_vtable_index(Method::invalid_vtable_index); 3029 } 3030 } 3031 return method_ordering; 3032 } 3033 3034 // Parse generic_signature attribute for methods and fields 3035 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3036 TRAPS) { 3037 assert(cfs != NULL, "invariant"); 3038 3039 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3040 const u2 generic_signature_index = cfs->get_u2_fast(); 3041 check_property( 3042 valid_symbol_at(generic_signature_index), 3043 "Invalid Signature attribute at constant pool index %u in class file %s", 3044 generic_signature_index, CHECK_0); 3045 return generic_signature_index; 3046 } 3047 3048 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3049 TRAPS) { 3050 3051 assert(cfs != NULL, "invariant"); 3052 3053 cfs->guarantee_more(2, CHECK); // sourcefile_index 3054 const u2 sourcefile_index = cfs->get_u2_fast(); 3055 check_property( 3056 valid_symbol_at(sourcefile_index), 3057 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3058 sourcefile_index, CHECK); 3059 set_class_sourcefile_index(sourcefile_index); 3060 } 3061 3062 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3063 int length, 3064 TRAPS) { 3065 assert(cfs != NULL, "invariant"); 3066 3067 const u1* const sde_buffer = cfs->current(); 3068 assert(sde_buffer != NULL, "null sde buffer"); 3069 3070 // Don't bother storing it if there is no way to retrieve it 3071 if (JvmtiExport::can_get_source_debug_extension()) { 3072 assert((length+1) > length, "Overflow checking"); 3073 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3074 for (int i = 0; i < length; i++) { 3075 sde[i] = sde_buffer[i]; 3076 } 3077 sde[length] = '\0'; 3078 set_class_sde_buffer((const char*)sde, length); 3079 } 3080 // Got utf8 string, set stream position forward 3081 cfs->skip_u1(length, CHECK); 3082 } 3083 3084 3085 // Inner classes can be static, private or protected (classic VM does this) 3086 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3087 JVM_ACC_PRIVATE | \ 3088 JVM_ACC_PROTECTED | \ 3089 JVM_ACC_STATIC \ 3090 ) 3091 3092 // Return number of classes in the inner classes attribute table 3093 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3094 const u1* const inner_classes_attribute_start, 3095 bool parsed_enclosingmethod_attribute, 3096 u2 enclosing_method_class_index, 3097 u2 enclosing_method_method_index, 3098 TRAPS) { 3099 const u1* const current_mark = cfs->current(); 3100 u2 length = 0; 3101 if (inner_classes_attribute_start != NULL) { 3102 cfs->set_current(inner_classes_attribute_start); 3103 cfs->guarantee_more(2, CHECK_0); // length 3104 length = cfs->get_u2_fast(); 3105 } 3106 3107 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3108 // method data: 3109 // [inner_class_info_index, 3110 // outer_class_info_index, 3111 // inner_name_index, 3112 // inner_class_access_flags, 3113 // ... 3114 // enclosing_method_class_index, 3115 // enclosing_method_method_index] 3116 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3117 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3118 _inner_classes = inner_classes; 3119 3120 int index = 0; 3121 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3122 for (int n = 0; n < length; n++) { 3123 // Inner class index 3124 const u2 inner_class_info_index = cfs->get_u2_fast(); 3125 check_property( 3126 valid_klass_reference_at(inner_class_info_index), 3127 "inner_class_info_index %u has bad constant type in class file %s", 3128 inner_class_info_index, CHECK_0); 3129 // Outer class index 3130 const u2 outer_class_info_index = cfs->get_u2_fast(); 3131 check_property( 3132 outer_class_info_index == 0 || 3133 valid_klass_reference_at(outer_class_info_index), 3134 "outer_class_info_index %u has bad constant type in class file %s", 3135 outer_class_info_index, CHECK_0); 3136 // Inner class name 3137 const u2 inner_name_index = cfs->get_u2_fast(); 3138 check_property( 3139 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3140 "inner_name_index %u has bad constant type in class file %s", 3141 inner_name_index, CHECK_0); 3142 if (_need_verify) { 3143 guarantee_property(inner_class_info_index != outer_class_info_index, 3144 "Class is both outer and inner class in class file %s", CHECK_0); 3145 } 3146 // Access flags 3147 jint flags; 3148 // JVM_ACC_MODULE is defined in JDK-9 and later. 3149 if (_major_version >= JAVA_9_VERSION) { 3150 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3151 } else { 3152 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3153 } 3154 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3155 // Set abstract bit for old class files for backward compatibility 3156 flags |= JVM_ACC_ABSTRACT; 3157 } 3158 verify_legal_class_modifiers(flags, CHECK_0); 3159 AccessFlags inner_access_flags(flags); 3160 3161 inner_classes->at_put(index++, inner_class_info_index); 3162 inner_classes->at_put(index++, outer_class_info_index); 3163 inner_classes->at_put(index++, inner_name_index); 3164 inner_classes->at_put(index++, inner_access_flags.as_short()); 3165 } 3166 3167 // 4347400: make sure there's no duplicate entry in the classes array 3168 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3169 for(int i = 0; i < length * 4; i += 4) { 3170 for(int j = i + 4; j < length * 4; j += 4) { 3171 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3172 inner_classes->at(i+1) != inner_classes->at(j+1) || 3173 inner_classes->at(i+2) != inner_classes->at(j+2) || 3174 inner_classes->at(i+3) != inner_classes->at(j+3)), 3175 "Duplicate entry in InnerClasses in class file %s", 3176 CHECK_0); 3177 } 3178 } 3179 } 3180 3181 // Set EnclosingMethod class and method indexes. 3182 if (parsed_enclosingmethod_attribute) { 3183 inner_classes->at_put(index++, enclosing_method_class_index); 3184 inner_classes->at_put(index++, enclosing_method_method_index); 3185 } 3186 assert(index == size, "wrong size"); 3187 3188 // Restore buffer's current position. 3189 cfs->set_current(current_mark); 3190 3191 return length; 3192 } 3193 3194 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3195 const u1* const nest_members_attribute_start, 3196 TRAPS) { 3197 const u1* const current_mark = cfs->current(); 3198 u2 length = 0; 3199 if (nest_members_attribute_start != NULL) { 3200 cfs->set_current(nest_members_attribute_start); 3201 cfs->guarantee_more(2, CHECK_0); // length 3202 length = cfs->get_u2_fast(); 3203 } 3204 const int size = length; 3205 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3206 _nest_members = nest_members; 3207 3208 int index = 0; 3209 cfs->guarantee_more(2 * length, CHECK_0); 3210 for (int n = 0; n < length; n++) { 3211 const u2 class_info_index = cfs->get_u2_fast(); 3212 check_property( 3213 valid_klass_reference_at(class_info_index), 3214 "Nest member class_info_index %u has bad constant type in class file %s", 3215 class_info_index, CHECK_0); 3216 nest_members->at_put(index++, class_info_index); 3217 } 3218 assert(index == size, "wrong size"); 3219 3220 // Restore buffer's current position. 3221 cfs->set_current(current_mark); 3222 3223 return length; 3224 } 3225 3226 // Record { 3227 // u2 attribute_name_index; 3228 // u4 attribute_length; 3229 // u2 components_count; 3230 // component_info components[components_count]; 3231 // } 3232 // component_info { 3233 // u2 name_index; 3234 // u2 descriptor_index 3235 // u2 attributs_count; 3236 // attribute_info_attributes[attributes_count]; 3237 // } 3238 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, 3239 const ConstantPool* cp, 3240 const u1* const record_attribute_start, 3241 TRAPS) { 3242 const u1* const current_mark = cfs->current(); 3243 int components_count = 0; 3244 unsigned int calculate_attr_size = 0; 3245 if (record_attribute_start != NULL) { 3246 cfs->set_current(record_attribute_start); 3247 cfs->guarantee_more(2, CHECK_0); // num of components 3248 components_count = (int)cfs->get_u2_fast(); 3249 calculate_attr_size = 2; 3250 } 3251 3252 Array<RecordComponent*>* const record_components = 3253 MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, NULL, CHECK_0); 3254 _record_components = record_components; 3255 3256 for (int x = 0; x < components_count; x++) { 3257 cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count 3258 3259 const u2 name_index = cfs->get_u2_fast(); 3260 check_property(valid_symbol_at(name_index), 3261 "Invalid constant pool index %u for name in Record attribute in class file %s", 3262 name_index, CHECK_0); 3263 const Symbol* const name = cp->symbol_at(name_index); 3264 verify_legal_field_name(name, CHECK_0); 3265 3266 const u2 descriptor_index = cfs->get_u2_fast(); 3267 check_property(valid_symbol_at(descriptor_index), 3268 "Invalid constant pool index %u for descriptor in Record attribute in class file %s", 3269 descriptor_index, CHECK_0); 3270 const Symbol* const descr = cp->symbol_at(descriptor_index); 3271 verify_legal_field_signature(name, descr, CHECK_0); 3272 3273 const u2 attributes_count = cfs->get_u2_fast(); 3274 calculate_attr_size += 6; 3275 u2 generic_sig_index = 0; 3276 const u1* runtime_visible_annotations = NULL; 3277 int runtime_visible_annotations_length = 0; 3278 const u1* runtime_invisible_annotations = NULL; 3279 int runtime_invisible_annotations_length = 0; 3280 bool runtime_invisible_annotations_exists = false; 3281 const u1* runtime_visible_type_annotations = NULL; 3282 int runtime_visible_type_annotations_length = 0; 3283 const u1* runtime_invisible_type_annotations = NULL; 3284 int runtime_invisible_type_annotations_length = 0; 3285 bool runtime_invisible_type_annotations_exists = false; 3286 3287 // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, 3288 // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. 3289 for (int y = 0; y < attributes_count; y++) { 3290 cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length 3291 const u2 attribute_name_index = cfs->get_u2_fast(); 3292 const u4 attribute_length = cfs->get_u4_fast(); 3293 calculate_attr_size += 6; 3294 check_property( 3295 valid_symbol_at(attribute_name_index), 3296 "Invalid Record attribute name index %u in class file %s", 3297 attribute_name_index, CHECK_0); 3298 3299 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 3300 if (attribute_name == vmSymbols::tag_signature()) { 3301 if (generic_sig_index != 0) { 3302 classfile_parse_error( 3303 "Multiple Signature attributes for Record component in class file %s", 3304 CHECK_0); 3305 } 3306 if (attribute_length != 2) { 3307 classfile_parse_error( 3308 "Invalid Signature attribute length %u in Record component in class file %s", 3309 attribute_length, CHECK_0); 3310 } 3311 generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); 3312 3313 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 3314 if (runtime_visible_annotations != NULL) { 3315 classfile_parse_error( 3316 "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", CHECK_0); 3317 } 3318 runtime_visible_annotations_length = attribute_length; 3319 runtime_visible_annotations = cfs->current(); 3320 3321 assert(runtime_visible_annotations != NULL, "null record component visible annotation"); 3322 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); 3323 cfs->skip_u1_fast(runtime_visible_annotations_length); 3324 3325 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 3326 if (runtime_invisible_annotations_exists) { 3327 classfile_parse_error( 3328 "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", CHECK_0); 3329 } 3330 runtime_invisible_annotations_exists = true; 3331 if (PreserveAllAnnotations) { 3332 runtime_invisible_annotations_length = attribute_length; 3333 runtime_invisible_annotations = cfs->current(); 3334 assert(runtime_invisible_annotations != NULL, "null record component invisible annotation"); 3335 } 3336 cfs->skip_u1(attribute_length, CHECK_0); 3337 3338 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 3339 if (runtime_visible_type_annotations != NULL) { 3340 classfile_parse_error( 3341 "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0); 3342 } 3343 runtime_visible_type_annotations_length = attribute_length; 3344 runtime_visible_type_annotations = cfs->current(); 3345 3346 assert(runtime_visible_type_annotations != NULL, "null record component visible type annotation"); 3347 cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); 3348 cfs->skip_u1_fast(runtime_visible_type_annotations_length); 3349 3350 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 3351 if (runtime_invisible_type_annotations_exists) { 3352 classfile_parse_error( 3353 "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", CHECK_0); 3354 } 3355 runtime_invisible_type_annotations_exists = true; 3356 if (PreserveAllAnnotations) { 3357 runtime_invisible_type_annotations_length = attribute_length; 3358 runtime_invisible_type_annotations = cfs->current(); 3359 assert(runtime_invisible_type_annotations != NULL, "null record component invisible type annotation"); 3360 } 3361 cfs->skip_u1(attribute_length, CHECK_0); 3362 3363 } else { 3364 // Skip unknown attributes 3365 cfs->skip_u1(attribute_length, CHECK_0); 3366 } 3367 calculate_attr_size += attribute_length; 3368 } // End of attributes For loop 3369 3370 AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations, 3371 runtime_visible_annotations_length, 3372 runtime_invisible_annotations, 3373 runtime_invisible_annotations_length, 3374 CHECK_0); 3375 AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations, 3376 runtime_visible_type_annotations_length, 3377 runtime_invisible_type_annotations, 3378 runtime_invisible_type_annotations_length, 3379 CHECK_0); 3380 3381 RecordComponent* record_component = 3382 RecordComponent::allocate(_loader_data, name_index, descriptor_index, 3383 attributes_count, generic_sig_index, 3384 annotations, type_annotations, CHECK_0); 3385 record_components->at_put(x, record_component); 3386 } // End of component processing loop 3387 3388 // Restore buffer's current position. 3389 cfs->set_current(current_mark); 3390 return calculate_attr_size; 3391 } 3392 3393 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3394 set_class_synthetic_flag(true); 3395 } 3396 3397 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3398 assert(cfs != NULL, "invariant"); 3399 3400 const u2 signature_index = cfs->get_u2(CHECK); 3401 check_property( 3402 valid_symbol_at(signature_index), 3403 "Invalid constant pool index %u in Signature attribute in class file %s", 3404 signature_index, CHECK); 3405 set_class_generic_signature_index(signature_index); 3406 } 3407 3408 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3409 ConstantPool* cp, 3410 u4 attribute_byte_length, 3411 TRAPS) { 3412 assert(cfs != NULL, "invariant"); 3413 assert(cp != NULL, "invariant"); 3414 3415 const u1* const current_start = cfs->current(); 3416 3417 guarantee_property(attribute_byte_length >= sizeof(u2), 3418 "Invalid BootstrapMethods attribute length %u in class file %s", 3419 attribute_byte_length, 3420 CHECK); 3421 3422 cfs->guarantee_more(attribute_byte_length, CHECK); 3423 3424 const int attribute_array_length = cfs->get_u2_fast(); 3425 3426 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3427 "Short length on BootstrapMethods in class file %s", 3428 CHECK); 3429 3430 3431 // The attribute contains a counted array of counted tuples of shorts, 3432 // represending bootstrap specifiers: 3433 // length*{bootstrap_method_index, argument_count*{argument_index}} 3434 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3435 // operand_count = number of shorts in attr, except for leading length 3436 3437 // The attribute is copied into a short[] array. 3438 // The array begins with a series of short[2] pairs, one for each tuple. 3439 const int index_size = (attribute_array_length * 2); 3440 3441 Array<u2>* const operands = 3442 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3443 3444 // Eagerly assign operands so they will be deallocated with the constant 3445 // pool if there is an error. 3446 cp->set_operands(operands); 3447 3448 int operand_fill_index = index_size; 3449 const int cp_size = cp->length(); 3450 3451 for (int n = 0; n < attribute_array_length; n++) { 3452 // Store a 32-bit offset into the header of the operand array. 3453 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3454 3455 // Read a bootstrap specifier. 3456 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3457 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3458 const u2 argument_count = cfs->get_u2_fast(); 3459 check_property( 3460 valid_cp_range(bootstrap_method_index, cp_size) && 3461 cp->tag_at(bootstrap_method_index).is_method_handle(), 3462 "bootstrap_method_index %u has bad constant type in class file %s", 3463 bootstrap_method_index, 3464 CHECK); 3465 3466 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3467 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3468 CHECK); 3469 3470 operands->at_put(operand_fill_index++, bootstrap_method_index); 3471 operands->at_put(operand_fill_index++, argument_count); 3472 3473 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3474 for (int j = 0; j < argument_count; j++) { 3475 const u2 argument_index = cfs->get_u2_fast(); 3476 check_property( 3477 valid_cp_range(argument_index, cp_size) && 3478 cp->tag_at(argument_index).is_loadable_constant(), 3479 "argument_index %u has bad constant type in class file %s", 3480 argument_index, 3481 CHECK); 3482 operands->at_put(operand_fill_index++, argument_index); 3483 } 3484 } 3485 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3486 "Bad length on BootstrapMethods in class file %s", 3487 CHECK); 3488 } 3489 3490 bool ClassFileParser::supports_records() { 3491 return _major_version == JAVA_14_VERSION && 3492 _minor_version == JAVA_PREVIEW_MINOR_VERSION && 3493 Arguments::enable_preview(); 3494 } 3495 3496 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3497 ConstantPool* cp, 3498 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3499 TRAPS) { 3500 assert(cfs != NULL, "invariant"); 3501 assert(cp != NULL, "invariant"); 3502 assert(parsed_annotations != NULL, "invariant"); 3503 3504 // Set inner classes attribute to default sentinel 3505 _inner_classes = Universe::the_empty_short_array(); 3506 // Set nest members attribute to default sentinel 3507 _nest_members = Universe::the_empty_short_array(); 3508 cfs->guarantee_more(2, CHECK); // attributes_count 3509 u2 attributes_count = cfs->get_u2_fast(); 3510 bool parsed_sourcefile_attribute = false; 3511 bool parsed_innerclasses_attribute = false; 3512 bool parsed_nest_members_attribute = false; 3513 bool parsed_nest_host_attribute = false; 3514 bool parsed_record_attribute = false; 3515 bool parsed_enclosingmethod_attribute = false; 3516 bool parsed_bootstrap_methods_attribute = false; 3517 const u1* runtime_visible_annotations = NULL; 3518 int runtime_visible_annotations_length = 0; 3519 const u1* runtime_invisible_annotations = NULL; 3520 int runtime_invisible_annotations_length = 0; 3521 const u1* runtime_visible_type_annotations = NULL; 3522 int runtime_visible_type_annotations_length = 0; 3523 const u1* runtime_invisible_type_annotations = NULL; 3524 int runtime_invisible_type_annotations_length = 0; 3525 bool runtime_invisible_type_annotations_exists = false; 3526 bool runtime_invisible_annotations_exists = false; 3527 bool parsed_source_debug_ext_annotations_exist = false; 3528 const u1* inner_classes_attribute_start = NULL; 3529 u4 inner_classes_attribute_length = 0; 3530 u2 enclosing_method_class_index = 0; 3531 u2 enclosing_method_method_index = 0; 3532 const u1* nest_members_attribute_start = NULL; 3533 u4 nest_members_attribute_length = 0; 3534 const u1* record_attribute_start = NULL; 3535 u4 record_attribute_length = 0; 3536 3537 // Iterate over attributes 3538 while (attributes_count--) { 3539 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3540 const u2 attribute_name_index = cfs->get_u2_fast(); 3541 const u4 attribute_length = cfs->get_u4_fast(); 3542 check_property( 3543 valid_symbol_at(attribute_name_index), 3544 "Attribute name has bad constant pool index %u in class file %s", 3545 attribute_name_index, CHECK); 3546 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3547 if (tag == vmSymbols::tag_source_file()) { 3548 // Check for SourceFile tag 3549 if (_need_verify) { 3550 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3551 } 3552 if (parsed_sourcefile_attribute) { 3553 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3554 } else { 3555 parsed_sourcefile_attribute = true; 3556 } 3557 parse_classfile_sourcefile_attribute(cfs, CHECK); 3558 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3559 // Check for SourceDebugExtension tag 3560 if (parsed_source_debug_ext_annotations_exist) { 3561 classfile_parse_error( 3562 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3563 } 3564 parsed_source_debug_ext_annotations_exist = true; 3565 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3566 } else if (tag == vmSymbols::tag_inner_classes()) { 3567 // Check for InnerClasses tag 3568 if (parsed_innerclasses_attribute) { 3569 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3570 } else { 3571 parsed_innerclasses_attribute = true; 3572 } 3573 inner_classes_attribute_start = cfs->current(); 3574 inner_classes_attribute_length = attribute_length; 3575 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3576 } else if (tag == vmSymbols::tag_synthetic()) { 3577 // Check for Synthetic tag 3578 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3579 if (attribute_length != 0) { 3580 classfile_parse_error( 3581 "Invalid Synthetic classfile attribute length %u in class file %s", 3582 attribute_length, CHECK); 3583 } 3584 parse_classfile_synthetic_attribute(CHECK); 3585 } else if (tag == vmSymbols::tag_deprecated()) { 3586 // Check for Deprecatd tag - 4276120 3587 if (attribute_length != 0) { 3588 classfile_parse_error( 3589 "Invalid Deprecated classfile attribute length %u in class file %s", 3590 attribute_length, CHECK); 3591 } 3592 } else if (_major_version >= JAVA_1_5_VERSION) { 3593 if (tag == vmSymbols::tag_signature()) { 3594 if (_generic_signature_index != 0) { 3595 classfile_parse_error( 3596 "Multiple Signature attributes in class file %s", CHECK); 3597 } 3598 if (attribute_length != 2) { 3599 classfile_parse_error( 3600 "Wrong Signature attribute length %u in class file %s", 3601 attribute_length, CHECK); 3602 } 3603 parse_classfile_signature_attribute(cfs, CHECK); 3604 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3605 if (runtime_visible_annotations != NULL) { 3606 classfile_parse_error( 3607 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3608 } 3609 runtime_visible_annotations_length = attribute_length; 3610 runtime_visible_annotations = cfs->current(); 3611 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3612 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3613 parse_annotations(cp, 3614 runtime_visible_annotations, 3615 runtime_visible_annotations_length, 3616 parsed_annotations, 3617 _loader_data, 3618 CHECK); 3619 cfs->skip_u1_fast(runtime_visible_annotations_length); 3620 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3621 if (runtime_invisible_annotations_exists) { 3622 classfile_parse_error( 3623 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3624 } 3625 runtime_invisible_annotations_exists = true; 3626 if (PreserveAllAnnotations) { 3627 runtime_invisible_annotations_length = attribute_length; 3628 runtime_invisible_annotations = cfs->current(); 3629 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3630 } 3631 cfs->skip_u1(attribute_length, CHECK); 3632 } else if (tag == vmSymbols::tag_enclosing_method()) { 3633 if (parsed_enclosingmethod_attribute) { 3634 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3635 } else { 3636 parsed_enclosingmethod_attribute = true; 3637 } 3638 guarantee_property(attribute_length == 4, 3639 "Wrong EnclosingMethod attribute length %u in class file %s", 3640 attribute_length, CHECK); 3641 cfs->guarantee_more(4, CHECK); // class_index, method_index 3642 enclosing_method_class_index = cfs->get_u2_fast(); 3643 enclosing_method_method_index = cfs->get_u2_fast(); 3644 if (enclosing_method_class_index == 0) { 3645 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3646 } 3647 // Validate the constant pool indices and types 3648 check_property(valid_klass_reference_at(enclosing_method_class_index), 3649 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3650 if (enclosing_method_method_index != 0 && 3651 (!cp->is_within_bounds(enclosing_method_method_index) || 3652 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3653 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3654 } 3655 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3656 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3657 if (parsed_bootstrap_methods_attribute) { 3658 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3659 } 3660 parsed_bootstrap_methods_attribute = true; 3661 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3662 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3663 if (runtime_visible_type_annotations != NULL) { 3664 classfile_parse_error( 3665 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3666 } 3667 runtime_visible_type_annotations_length = attribute_length; 3668 runtime_visible_type_annotations = cfs->current(); 3669 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3670 // No need for the VM to parse Type annotations 3671 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3672 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3673 if (runtime_invisible_type_annotations_exists) { 3674 classfile_parse_error( 3675 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3676 } else { 3677 runtime_invisible_type_annotations_exists = true; 3678 } 3679 if (PreserveAllAnnotations) { 3680 runtime_invisible_type_annotations_length = attribute_length; 3681 runtime_invisible_type_annotations = cfs->current(); 3682 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3683 } 3684 cfs->skip_u1(attribute_length, CHECK); 3685 } else if (_major_version >= JAVA_11_VERSION) { 3686 if (tag == vmSymbols::tag_nest_members()) { 3687 // Check for NestMembers tag 3688 if (parsed_nest_members_attribute) { 3689 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK); 3690 } else { 3691 parsed_nest_members_attribute = true; 3692 } 3693 if (parsed_nest_host_attribute) { 3694 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK); 3695 } 3696 nest_members_attribute_start = cfs->current(); 3697 nest_members_attribute_length = attribute_length; 3698 cfs->skip_u1(nest_members_attribute_length, CHECK); 3699 } else if (tag == vmSymbols::tag_nest_host()) { 3700 if (parsed_nest_host_attribute) { 3701 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK); 3702 } else { 3703 parsed_nest_host_attribute = true; 3704 } 3705 if (parsed_nest_members_attribute) { 3706 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK); 3707 } 3708 if (_need_verify) { 3709 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3710 } 3711 cfs->guarantee_more(2, CHECK); 3712 u2 class_info_index = cfs->get_u2_fast(); 3713 check_property( 3714 valid_klass_reference_at(class_info_index), 3715 "Nest-host class_info_index %u has bad constant type in class file %s", 3716 class_info_index, CHECK); 3717 _nest_host = class_info_index; 3718 } else if (_major_version >= JAVA_14_VERSION) { 3719 if (tag == vmSymbols::tag_record()) { 3720 // Skip over Record attribute if not supported or if super class is 3721 // not java.lang.Record. 3722 if (supports_records() && 3723 cp->klass_name_at(_super_class_index) == vmSymbols::java_lang_Record()) { 3724 if (parsed_record_attribute) { 3725 classfile_parse_error("Multiple Record attributes in class file %s", CHECK); 3726 } 3727 // Check that class is final and not abstract. 3728 if (!_access_flags.is_final() || _access_flags.is_abstract()) { 3729 classfile_parse_error("Record attribute in non-final or abstract class file %s", CHECK); 3730 } 3731 parsed_record_attribute = true; 3732 record_attribute_start = cfs->current(); 3733 record_attribute_length = attribute_length; 3734 } 3735 cfs->skip_u1(attribute_length, CHECK); 3736 } else { 3737 // Unknown attribute 3738 cfs->skip_u1(attribute_length, CHECK); 3739 } 3740 } else { 3741 // Unknown attribute 3742 cfs->skip_u1(attribute_length, CHECK); 3743 } 3744 } else { 3745 // Unknown attribute 3746 cfs->skip_u1(attribute_length, CHECK); 3747 } 3748 } else { 3749 // Unknown attribute 3750 cfs->skip_u1(attribute_length, CHECK); 3751 } 3752 } 3753 _class_annotations = assemble_annotations(runtime_visible_annotations, 3754 runtime_visible_annotations_length, 3755 runtime_invisible_annotations, 3756 runtime_invisible_annotations_length, 3757 CHECK); 3758 _class_type_annotations = assemble_annotations(runtime_visible_type_annotations, 3759 runtime_visible_type_annotations_length, 3760 runtime_invisible_type_annotations, 3761 runtime_invisible_type_annotations_length, 3762 CHECK); 3763 3764 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3765 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3766 cfs, 3767 inner_classes_attribute_start, 3768 parsed_innerclasses_attribute, 3769 enclosing_method_class_index, 3770 enclosing_method_method_index, 3771 CHECK); 3772 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3773 guarantee_property( 3774 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3775 "Wrong InnerClasses attribute length in class file %s", CHECK); 3776 } 3777 } 3778 3779 if (parsed_nest_members_attribute) { 3780 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3781 cfs, 3782 nest_members_attribute_start, 3783 CHECK); 3784 if (_need_verify) { 3785 guarantee_property( 3786 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3787 "Wrong NestMembers attribute length in class file %s", CHECK); 3788 } 3789 } 3790 3791 if (parsed_record_attribute) { 3792 const unsigned int calculated_attr_length = parse_classfile_record_attribute( 3793 cfs, 3794 cp, 3795 record_attribute_start, 3796 CHECK); 3797 if (_need_verify) { 3798 guarantee_property(record_attribute_length == calculated_attr_length, 3799 "Record attribute has wrong length in class file %s", 3800 CHECK); 3801 } 3802 } 3803 3804 if (_max_bootstrap_specifier_index >= 0) { 3805 guarantee_property(parsed_bootstrap_methods_attribute, 3806 "Missing BootstrapMethods attribute in class file %s", CHECK); 3807 } 3808 } 3809 3810 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3811 assert(k != NULL, "invariant"); 3812 3813 if (_synthetic_flag) 3814 k->set_is_synthetic(); 3815 if (_sourcefile_index != 0) { 3816 k->set_source_file_name_index(_sourcefile_index); 3817 } 3818 if (_generic_signature_index != 0) { 3819 k->set_generic_signature_index(_generic_signature_index); 3820 } 3821 if (_sde_buffer != NULL) { 3822 k->set_source_debug_extension(_sde_buffer, _sde_length); 3823 } 3824 } 3825 3826 // Create the Annotations object that will 3827 // hold the annotations array for the Klass. 3828 void ClassFileParser::create_combined_annotations(TRAPS) { 3829 if (_class_annotations == NULL && 3830 _class_type_annotations == NULL && 3831 _fields_annotations == NULL && 3832 _fields_type_annotations == NULL) { 3833 // Don't create the Annotations object unnecessarily. 3834 return; 3835 } 3836 3837 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3838 annotations->set_class_annotations(_class_annotations); 3839 annotations->set_class_type_annotations(_class_type_annotations); 3840 annotations->set_fields_annotations(_fields_annotations); 3841 annotations->set_fields_type_annotations(_fields_type_annotations); 3842 3843 // This is the Annotations object that will be 3844 // assigned to InstanceKlass being constructed. 3845 _combined_annotations = annotations; 3846 3847 // The annotations arrays below has been transfered the 3848 // _combined_annotations so these fields can now be cleared. 3849 _class_annotations = NULL; 3850 _class_type_annotations = NULL; 3851 _fields_annotations = NULL; 3852 _fields_type_annotations = NULL; 3853 } 3854 3855 // Transfer ownership of metadata allocated to the InstanceKlass. 3856 void ClassFileParser::apply_parsed_class_metadata( 3857 InstanceKlass* this_klass, 3858 int java_fields_count, 3859 TRAPS) { 3860 assert(this_klass != NULL, "invariant"); 3861 3862 _cp->set_pool_holder(this_klass); 3863 this_klass->set_constants(_cp); 3864 this_klass->set_fields(_fields, java_fields_count); 3865 this_klass->set_methods(_methods); 3866 this_klass->set_inner_classes(_inner_classes); 3867 this_klass->set_nest_members(_nest_members); 3868 this_klass->set_nest_host_index(_nest_host); 3869 this_klass->set_local_interfaces(_local_interfaces); 3870 this_klass->set_annotations(_combined_annotations); 3871 this_klass->set_record_components(_record_components); 3872 // Delay the setting of _transitive_interfaces until after initialize_supers() in 3873 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with 3874 // its _super. If an OOM occurs while loading the current klass, its _super field 3875 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3876 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3877 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3878 3879 // Clear out these fields so they don't get deallocated by the destructor 3880 clear_class_metadata(); 3881 } 3882 3883 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3884 int runtime_visible_annotations_length, 3885 const u1* const runtime_invisible_annotations, 3886 int runtime_invisible_annotations_length, 3887 TRAPS) { 3888 AnnotationArray* annotations = NULL; 3889 if (runtime_visible_annotations != NULL || 3890 runtime_invisible_annotations != NULL) { 3891 annotations = MetadataFactory::new_array<u1>(_loader_data, 3892 runtime_visible_annotations_length + 3893 runtime_invisible_annotations_length, 3894 CHECK_(annotations)); 3895 if (runtime_visible_annotations != NULL) { 3896 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3897 annotations->at_put(i, runtime_visible_annotations[i]); 3898 } 3899 } 3900 if (runtime_invisible_annotations != NULL) { 3901 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3902 int append = runtime_visible_annotations_length+i; 3903 annotations->at_put(append, runtime_invisible_annotations[i]); 3904 } 3905 } 3906 } 3907 return annotations; 3908 } 3909 3910 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3911 const int super_class_index, 3912 const bool need_verify, 3913 TRAPS) { 3914 assert(cp != NULL, "invariant"); 3915 const InstanceKlass* super_klass = NULL; 3916 3917 if (super_class_index == 0) { 3918 check_property(_class_name == vmSymbols::java_lang_Object(), 3919 "Invalid superclass index %u in class file %s", 3920 super_class_index, 3921 CHECK_NULL); 3922 } else { 3923 check_property(valid_klass_reference_at(super_class_index), 3924 "Invalid superclass index %u in class file %s", 3925 super_class_index, 3926 CHECK_NULL); 3927 // The class name should be legal because it is checked when parsing constant pool. 3928 // However, make sure it is not an array type. 3929 bool is_array = false; 3930 if (cp->tag_at(super_class_index).is_klass()) { 3931 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3932 if (need_verify) 3933 is_array = super_klass->is_array_klass(); 3934 } else if (need_verify) { 3935 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY); 3936 } 3937 if (need_verify) { 3938 guarantee_property(!is_array, 3939 "Bad superclass name in class file %s", CHECK_NULL); 3940 } 3941 } 3942 return super_klass; 3943 } 3944 3945 static unsigned int compute_oop_map_count(const InstanceKlass* super, 3946 unsigned int nonstatic_oop_map_count, 3947 int first_nonstatic_oop_offset) { 3948 3949 unsigned int map_count = 3950 NULL == super ? 0 : super->nonstatic_oop_map_count(); 3951 if (nonstatic_oop_map_count > 0) { 3952 // We have oops to add to map 3953 if (map_count == 0) { 3954 map_count = nonstatic_oop_map_count; 3955 } 3956 else { 3957 // Check whether we should add a new map block or whether the last one can 3958 // be extended 3959 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3960 const OopMapBlock* const last_map = first_map + map_count - 1; 3961 3962 const int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3963 if (next_offset == first_nonstatic_oop_offset) { 3964 // There is no gap bettwen superklass's last oop field and first 3965 // local oop field, merge maps. 3966 nonstatic_oop_map_count -= 1; 3967 } 3968 else { 3969 // Superklass didn't end with a oop field, add extra maps 3970 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3971 } 3972 map_count += nonstatic_oop_map_count; 3973 } 3974 } 3975 return map_count; 3976 } 3977 3978 #ifndef PRODUCT 3979 static void print_field_layout(const Symbol* name, 3980 Array<u2>* fields, 3981 const constantPoolHandle& cp, 3982 int instance_size, 3983 int instance_fields_start, 3984 int instance_fields_end, 3985 int static_fields_end) { 3986 3987 assert(name != NULL, "invariant"); 3988 3989 tty->print("%s: field layout\n", name->as_klass_external_name()); 3990 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3991 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3992 if (!fs.access_flags().is_static()) { 3993 tty->print(" @%3d \"%s\" %s\n", 3994 fs.offset(), 3995 fs.name()->as_klass_external_name(), 3996 fs.signature()->as_klass_external_name()); 3997 } 3998 } 3999 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4000 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4001 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4002 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4003 if (fs.access_flags().is_static()) { 4004 tty->print(" @%3d \"%s\" %s\n", 4005 fs.offset(), 4006 fs.name()->as_klass_external_name(), 4007 fs.signature()->as_klass_external_name()); 4008 } 4009 } 4010 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4011 tty->print("\n"); 4012 } 4013 #endif 4014 4015 // Values needed for oopmap and InstanceKlass creation 4016 class ClassFileParser::FieldLayoutInfo : public ResourceObj { 4017 public: 4018 int* nonstatic_oop_offsets; 4019 unsigned int* nonstatic_oop_counts; 4020 unsigned int nonstatic_oop_map_count; 4021 unsigned int total_oop_map_count; 4022 int instance_size; 4023 int nonstatic_field_size; 4024 int static_field_size; 4025 bool has_nonstatic_fields; 4026 }; 4027 4028 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 4029 void ClassFileParser::layout_fields(ConstantPool* cp, 4030 const FieldAllocationCount* fac, 4031 const ClassAnnotationCollector* parsed_annotations, 4032 FieldLayoutInfo* info, 4033 TRAPS) { 4034 4035 assert(cp != NULL, "invariant"); 4036 4037 // Field size and offset computation 4038 int nonstatic_field_size = _super_klass == NULL ? 0 : 4039 _super_klass->nonstatic_field_size(); 4040 4041 // Count the contended fields by type. 4042 // 4043 // We ignore static fields, because @Contended is not supported for them. 4044 // The layout code below will also ignore the static fields. 4045 int nonstatic_contended_count = 0; 4046 FieldAllocationCount fac_contended; 4047 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4048 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4049 if (fs.is_contended()) { 4050 fac_contended.count[atype]++; 4051 if (!fs.access_flags().is_static()) { 4052 nonstatic_contended_count++; 4053 } 4054 } 4055 } 4056 4057 4058 // Calculate the starting byte offsets 4059 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 4060 int next_static_double_offset = next_static_oop_offset + 4061 ((fac->count[STATIC_OOP]) * heapOopSize); 4062 if (fac->count[STATIC_DOUBLE]) { 4063 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 4064 } 4065 4066 int next_static_word_offset = next_static_double_offset + 4067 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 4068 int next_static_short_offset = next_static_word_offset + 4069 ((fac->count[STATIC_WORD]) * BytesPerInt); 4070 int next_static_byte_offset = next_static_short_offset + 4071 ((fac->count[STATIC_SHORT]) * BytesPerShort); 4072 4073 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 4074 nonstatic_field_size * heapOopSize; 4075 4076 int next_nonstatic_field_offset = nonstatic_fields_start; 4077 4078 const bool is_contended_class = parsed_annotations->is_contended(); 4079 4080 // Class is contended, pad before all the fields 4081 if (is_contended_class) { 4082 next_nonstatic_field_offset += ContendedPaddingWidth; 4083 } 4084 4085 // Compute the non-contended fields count. 4086 // The packing code below relies on these counts to determine if some field 4087 // can be squeezed into the alignment gap. Contended fields are obviously 4088 // exempt from that. 4089 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 4090 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 4091 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 4092 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 4093 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 4094 4095 // Total non-static fields count, including every contended field 4096 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 4097 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 4098 fac->count[NONSTATIC_OOP]; 4099 4100 const bool super_has_nonstatic_fields = 4101 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 4102 const bool has_nonstatic_fields = 4103 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 4104 4105 4106 // Prepare list of oops for oop map generation. 4107 // 4108 // "offset" and "count" lists are describing the set of contiguous oop 4109 // regions. offset[i] is the start of the i-th region, which then has 4110 // count[i] oops following. Before we know how many regions are required, 4111 // we pessimistically allocate the maps to fit all the oops into the 4112 // distinct regions. 4113 // 4114 // TODO: We add +1 to always allocate non-zero resource arrays; we need 4115 // to figure out if we still need to do this. 4116 unsigned int nonstatic_oop_map_count = 0; 4117 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 4118 4119 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 4120 THREAD, int, max_nonstatic_oop_maps); 4121 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 4122 THREAD, unsigned int, max_nonstatic_oop_maps); 4123 4124 int first_nonstatic_oop_offset = 0; // will be set for first oop field 4125 4126 bool compact_fields = CompactFields; 4127 int allocation_style = FieldsAllocationStyle; 4128 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 4129 assert(false, "0 <= FieldsAllocationStyle <= 2"); 4130 allocation_style = 1; // Optimistic 4131 } 4132 4133 // The next classes have predefined hard-coded fields offsets 4134 // (see in JavaClasses::compute_hard_coded_offsets()). 4135 // Use default fields allocation order for them. 4136 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL && 4137 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 4138 _class_name == vmSymbols::java_lang_Class() || 4139 _class_name == vmSymbols::java_lang_ClassLoader() || 4140 _class_name == vmSymbols::java_lang_ref_Reference() || 4141 _class_name == vmSymbols::java_lang_ref_SoftReference() || 4142 _class_name == vmSymbols::java_lang_StackTraceElement() || 4143 _class_name == vmSymbols::java_lang_String() || 4144 _class_name == vmSymbols::java_lang_Throwable() || 4145 _class_name == vmSymbols::java_lang_Boolean() || 4146 _class_name == vmSymbols::java_lang_Character() || 4147 _class_name == vmSymbols::java_lang_Float() || 4148 _class_name == vmSymbols::java_lang_Double() || 4149 _class_name == vmSymbols::java_lang_Byte() || 4150 _class_name == vmSymbols::java_lang_Short() || 4151 _class_name == vmSymbols::java_lang_Integer() || 4152 _class_name == vmSymbols::java_lang_Long())) { 4153 allocation_style = 0; // Allocate oops first 4154 compact_fields = false; // Don't compact fields 4155 } 4156 4157 int next_nonstatic_oop_offset = 0; 4158 int next_nonstatic_double_offset = 0; 4159 4160 // Rearrange fields for a given allocation style 4161 if( allocation_style == 0 ) { 4162 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 4163 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4164 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4165 (nonstatic_oop_count * heapOopSize); 4166 } else if( allocation_style == 1 ) { 4167 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 4168 next_nonstatic_double_offset = next_nonstatic_field_offset; 4169 } else if( allocation_style == 2 ) { 4170 // Fields allocation: oops fields in super and sub classes are together. 4171 if( nonstatic_field_size > 0 && _super_klass != NULL && 4172 _super_klass->nonstatic_oop_map_size() > 0 ) { 4173 const unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 4174 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps(); 4175 const OopMapBlock* const last_map = first_map + map_count - 1; 4176 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 4177 if (next_offset == next_nonstatic_field_offset) { 4178 allocation_style = 0; // allocate oops first 4179 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4180 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4181 (nonstatic_oop_count * heapOopSize); 4182 } 4183 } 4184 if( allocation_style == 2 ) { 4185 allocation_style = 1; // allocate oops last 4186 next_nonstatic_double_offset = next_nonstatic_field_offset; 4187 } 4188 } else { 4189 ShouldNotReachHere(); 4190 } 4191 4192 int nonstatic_oop_space_count = 0; 4193 int nonstatic_word_space_count = 0; 4194 int nonstatic_short_space_count = 0; 4195 int nonstatic_byte_space_count = 0; 4196 int nonstatic_oop_space_offset = 0; 4197 int nonstatic_word_space_offset = 0; 4198 int nonstatic_short_space_offset = 0; 4199 int nonstatic_byte_space_offset = 0; 4200 4201 // Try to squeeze some of the fields into the gaps due to 4202 // long/double alignment. 4203 if (nonstatic_double_count > 0) { 4204 int offset = next_nonstatic_double_offset; 4205 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 4206 if (compact_fields && offset != next_nonstatic_double_offset) { 4207 // Allocate available fields into the gap before double field. 4208 int length = next_nonstatic_double_offset - offset; 4209 assert(length == BytesPerInt, ""); 4210 nonstatic_word_space_offset = offset; 4211 if (nonstatic_word_count > 0) { 4212 nonstatic_word_count -= 1; 4213 nonstatic_word_space_count = 1; // Only one will fit 4214 length -= BytesPerInt; 4215 offset += BytesPerInt; 4216 } 4217 nonstatic_short_space_offset = offset; 4218 while (length >= BytesPerShort && nonstatic_short_count > 0) { 4219 nonstatic_short_count -= 1; 4220 nonstatic_short_space_count += 1; 4221 length -= BytesPerShort; 4222 offset += BytesPerShort; 4223 } 4224 nonstatic_byte_space_offset = offset; 4225 while (length > 0 && nonstatic_byte_count > 0) { 4226 nonstatic_byte_count -= 1; 4227 nonstatic_byte_space_count += 1; 4228 length -= 1; 4229 } 4230 // Allocate oop field in the gap if there are no other fields for that. 4231 nonstatic_oop_space_offset = offset; 4232 if (length >= heapOopSize && nonstatic_oop_count > 0 && 4233 allocation_style != 0) { // when oop fields not first 4234 nonstatic_oop_count -= 1; 4235 nonstatic_oop_space_count = 1; // Only one will fit 4236 length -= heapOopSize; 4237 offset += heapOopSize; 4238 } 4239 } 4240 } 4241 4242 int next_nonstatic_word_offset = next_nonstatic_double_offset + 4243 (nonstatic_double_count * BytesPerLong); 4244 int next_nonstatic_short_offset = next_nonstatic_word_offset + 4245 (nonstatic_word_count * BytesPerInt); 4246 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 4247 (nonstatic_short_count * BytesPerShort); 4248 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 4249 nonstatic_byte_count; 4250 4251 // let oops jump before padding with this allocation style 4252 if( allocation_style == 1 ) { 4253 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 4254 if( nonstatic_oop_count > 0 ) { 4255 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 4256 } 4257 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 4258 } 4259 4260 // Iterate over fields again and compute correct offsets. 4261 // The field allocation type was temporarily stored in the offset slot. 4262 // oop fields are located before non-oop fields (static and non-static). 4263 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4264 4265 // skip already laid out fields 4266 if (fs.is_offset_set()) continue; 4267 4268 // contended instance fields are handled below 4269 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 4270 4271 int real_offset = 0; 4272 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4273 4274 // pack the rest of the fields 4275 switch (atype) { 4276 case STATIC_OOP: 4277 real_offset = next_static_oop_offset; 4278 next_static_oop_offset += heapOopSize; 4279 break; 4280 case STATIC_BYTE: 4281 real_offset = next_static_byte_offset; 4282 next_static_byte_offset += 1; 4283 break; 4284 case STATIC_SHORT: 4285 real_offset = next_static_short_offset; 4286 next_static_short_offset += BytesPerShort; 4287 break; 4288 case STATIC_WORD: 4289 real_offset = next_static_word_offset; 4290 next_static_word_offset += BytesPerInt; 4291 break; 4292 case STATIC_DOUBLE: 4293 real_offset = next_static_double_offset; 4294 next_static_double_offset += BytesPerLong; 4295 break; 4296 case NONSTATIC_OOP: 4297 if( nonstatic_oop_space_count > 0 ) { 4298 real_offset = nonstatic_oop_space_offset; 4299 nonstatic_oop_space_offset += heapOopSize; 4300 nonstatic_oop_space_count -= 1; 4301 } else { 4302 real_offset = next_nonstatic_oop_offset; 4303 next_nonstatic_oop_offset += heapOopSize; 4304 } 4305 4306 // Record this oop in the oop maps 4307 if( nonstatic_oop_map_count > 0 && 4308 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4309 real_offset - 4310 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4311 heapOopSize ) { 4312 // This oop is adjacent to the previous one, add to current oop map 4313 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4314 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4315 } else { 4316 // This oop is not adjacent to the previous one, create new oop map 4317 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4318 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4319 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4320 nonstatic_oop_map_count += 1; 4321 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4322 first_nonstatic_oop_offset = real_offset; 4323 } 4324 } 4325 break; 4326 case NONSTATIC_BYTE: 4327 if( nonstatic_byte_space_count > 0 ) { 4328 real_offset = nonstatic_byte_space_offset; 4329 nonstatic_byte_space_offset += 1; 4330 nonstatic_byte_space_count -= 1; 4331 } else { 4332 real_offset = next_nonstatic_byte_offset; 4333 next_nonstatic_byte_offset += 1; 4334 } 4335 break; 4336 case NONSTATIC_SHORT: 4337 if( nonstatic_short_space_count > 0 ) { 4338 real_offset = nonstatic_short_space_offset; 4339 nonstatic_short_space_offset += BytesPerShort; 4340 nonstatic_short_space_count -= 1; 4341 } else { 4342 real_offset = next_nonstatic_short_offset; 4343 next_nonstatic_short_offset += BytesPerShort; 4344 } 4345 break; 4346 case NONSTATIC_WORD: 4347 if( nonstatic_word_space_count > 0 ) { 4348 real_offset = nonstatic_word_space_offset; 4349 nonstatic_word_space_offset += BytesPerInt; 4350 nonstatic_word_space_count -= 1; 4351 } else { 4352 real_offset = next_nonstatic_word_offset; 4353 next_nonstatic_word_offset += BytesPerInt; 4354 } 4355 break; 4356 case NONSTATIC_DOUBLE: 4357 real_offset = next_nonstatic_double_offset; 4358 next_nonstatic_double_offset += BytesPerLong; 4359 break; 4360 default: 4361 ShouldNotReachHere(); 4362 } 4363 fs.set_offset(real_offset); 4364 } 4365 4366 4367 // Handle the contended cases. 4368 // 4369 // Each contended field should not intersect the cache line with another contended field. 4370 // In the absence of alignment information, we end up with pessimistically separating 4371 // the fields with full-width padding. 4372 // 4373 // Additionally, this should not break alignment for the fields, so we round the alignment up 4374 // for each field. 4375 if (nonstatic_contended_count > 0) { 4376 4377 // if there is at least one contended field, we need to have pre-padding for them 4378 next_nonstatic_padded_offset += ContendedPaddingWidth; 4379 4380 // collect all contended groups 4381 ResourceBitMap bm(cp->size()); 4382 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4383 // skip already laid out fields 4384 if (fs.is_offset_set()) continue; 4385 4386 if (fs.is_contended()) { 4387 bm.set_bit(fs.contended_group()); 4388 } 4389 } 4390 4391 int current_group = -1; 4392 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4393 4394 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4395 4396 // skip already laid out fields 4397 if (fs.is_offset_set()) continue; 4398 4399 // skip non-contended fields and fields from different group 4400 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4401 4402 // handle statics below 4403 if (fs.access_flags().is_static()) continue; 4404 4405 int real_offset = 0; 4406 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4407 4408 switch (atype) { 4409 case NONSTATIC_BYTE: 4410 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4411 real_offset = next_nonstatic_padded_offset; 4412 next_nonstatic_padded_offset += 1; 4413 break; 4414 4415 case NONSTATIC_SHORT: 4416 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4417 real_offset = next_nonstatic_padded_offset; 4418 next_nonstatic_padded_offset += BytesPerShort; 4419 break; 4420 4421 case NONSTATIC_WORD: 4422 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4423 real_offset = next_nonstatic_padded_offset; 4424 next_nonstatic_padded_offset += BytesPerInt; 4425 break; 4426 4427 case NONSTATIC_DOUBLE: 4428 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4429 real_offset = next_nonstatic_padded_offset; 4430 next_nonstatic_padded_offset += BytesPerLong; 4431 break; 4432 4433 case NONSTATIC_OOP: 4434 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4435 real_offset = next_nonstatic_padded_offset; 4436 next_nonstatic_padded_offset += heapOopSize; 4437 4438 // Record this oop in the oop maps 4439 if( nonstatic_oop_map_count > 0 && 4440 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4441 real_offset - 4442 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4443 heapOopSize ) { 4444 // This oop is adjacent to the previous one, add to current oop map 4445 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4446 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4447 } else { 4448 // This oop is not adjacent to the previous one, create new oop map 4449 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4450 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4451 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4452 nonstatic_oop_map_count += 1; 4453 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4454 first_nonstatic_oop_offset = real_offset; 4455 } 4456 } 4457 break; 4458 4459 default: 4460 ShouldNotReachHere(); 4461 } 4462 4463 if (fs.contended_group() == 0) { 4464 // Contended group defines the equivalence class over the fields: 4465 // the fields within the same contended group are not inter-padded. 4466 // The only exception is default group, which does not incur the 4467 // equivalence, and so requires intra-padding. 4468 next_nonstatic_padded_offset += ContendedPaddingWidth; 4469 } 4470 4471 fs.set_offset(real_offset); 4472 } // for 4473 4474 // Start laying out the next group. 4475 // Note that this will effectively pad the last group in the back; 4476 // this is expected to alleviate memory contention effects for 4477 // subclass fields and/or adjacent object. 4478 // If this was the default group, the padding is already in place. 4479 if (current_group != 0) { 4480 next_nonstatic_padded_offset += ContendedPaddingWidth; 4481 } 4482 } 4483 4484 // handle static fields 4485 } 4486 4487 // Entire class is contended, pad in the back. 4488 // This helps to alleviate memory contention effects for subclass fields 4489 // and/or adjacent object. 4490 if (is_contended_class) { 4491 next_nonstatic_padded_offset += ContendedPaddingWidth; 4492 } 4493 4494 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4495 4496 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize); 4497 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4498 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4499 4500 int static_field_size = (static_fields_end - 4501 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4502 nonstatic_field_size = nonstatic_field_size + 4503 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4504 4505 int instance_size = align_object_size(instance_end / wordSize); 4506 4507 assert(instance_size == align_object_size(align_up( 4508 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 4509 wordSize) / wordSize), "consistent layout helper value"); 4510 4511 // Invariant: nonstatic_field end/start should only change if there are 4512 // nonstatic fields in the class, or if the class is contended. We compare 4513 // against the non-aligned value, so that end alignment will not fail the 4514 // assert without actually having the fields. 4515 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4516 is_contended_class || 4517 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4518 4519 // Number of non-static oop map blocks allocated at end of klass. 4520 const unsigned int total_oop_map_count = 4521 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 4522 first_nonstatic_oop_offset); 4523 4524 #ifndef PRODUCT 4525 if (PrintFieldLayout) { 4526 print_field_layout(_class_name, 4527 _fields, 4528 cp, 4529 instance_size, 4530 nonstatic_fields_start, 4531 nonstatic_fields_end, 4532 static_fields_end); 4533 } 4534 4535 #endif 4536 // Pass back information needed for InstanceKlass creation 4537 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 4538 info->nonstatic_oop_counts = nonstatic_oop_counts; 4539 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 4540 info->total_oop_map_count = total_oop_map_count; 4541 info->instance_size = instance_size; 4542 info->static_field_size = static_field_size; 4543 info->nonstatic_field_size = nonstatic_field_size; 4544 info->has_nonstatic_fields = has_nonstatic_fields; 4545 } 4546 4547 static void fill_oop_maps(const InstanceKlass* k, 4548 unsigned int nonstatic_oop_map_count, 4549 const int* nonstatic_oop_offsets, 4550 const unsigned int* nonstatic_oop_counts) { 4551 4552 assert(k != NULL, "invariant"); 4553 4554 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4555 const InstanceKlass* const super = k->superklass(); 4556 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4557 if (super_count > 0) { 4558 // Copy maps from superklass 4559 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4560 for (unsigned int i = 0; i < super_count; ++i) { 4561 *this_oop_map++ = *super_oop_map++; 4562 } 4563 } 4564 4565 if (nonstatic_oop_map_count > 0) { 4566 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4567 // The counts differ because there is no gap between superklass's last oop 4568 // field and the first local oop field. Extend the last oop map copied 4569 // from the superklass instead of creating new one. 4570 nonstatic_oop_map_count--; 4571 nonstatic_oop_offsets++; 4572 this_oop_map--; 4573 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4574 this_oop_map++; 4575 } 4576 4577 // Add new map blocks, fill them 4578 while (nonstatic_oop_map_count-- > 0) { 4579 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4580 this_oop_map->set_count(*nonstatic_oop_counts++); 4581 this_oop_map++; 4582 } 4583 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4584 this_oop_map, "sanity"); 4585 } 4586 } 4587 4588 4589 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4590 assert(ik != NULL, "invariant"); 4591 4592 const Klass* const super = ik->super(); 4593 4594 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4595 // in which case we don't have to register objects as finalizable 4596 if (!_has_empty_finalizer) { 4597 if (_has_finalizer || 4598 (super != NULL && super->has_finalizer())) { 4599 ik->set_has_finalizer(); 4600 } 4601 } 4602 4603 #ifdef ASSERT 4604 bool f = false; 4605 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4606 vmSymbols::void_method_signature()); 4607 if (m != NULL && !m->is_empty_method()) { 4608 f = true; 4609 } 4610 4611 // Spec doesn't prevent agent from redefinition of empty finalizer. 4612 // Despite the fact that it's generally bad idea and redefined finalizer 4613 // will not work as expected we shouldn't abort vm in this case 4614 if (!ik->has_redefined_this_or_super()) { 4615 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4616 } 4617 #endif 4618 4619 // Check if this klass supports the java.lang.Cloneable interface 4620 if (SystemDictionary::Cloneable_klass_loaded()) { 4621 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4622 ik->set_is_cloneable(); 4623 } 4624 } 4625 4626 // Check if this klass has a vanilla default constructor 4627 if (super == NULL) { 4628 // java.lang.Object has empty default constructor 4629 ik->set_has_vanilla_constructor(); 4630 } else { 4631 if (super->has_vanilla_constructor() && 4632 _has_vanilla_constructor) { 4633 ik->set_has_vanilla_constructor(); 4634 } 4635 #ifdef ASSERT 4636 bool v = false; 4637 if (super->has_vanilla_constructor()) { 4638 const Method* const constructor = 4639 ik->find_method(vmSymbols::object_initializer_name(), 4640 vmSymbols::void_method_signature()); 4641 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4642 v = true; 4643 } 4644 } 4645 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4646 #endif 4647 } 4648 4649 // If it cannot be fast-path allocated, set a bit in the layout helper. 4650 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4651 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4652 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4653 || ik->is_abstract() || ik->is_interface() 4654 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4655 || ik->size_helper() >= FastAllocateSizeLimit) { 4656 // Forbid fast-path allocation. 4657 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4658 ik->set_layout_helper(lh); 4659 } 4660 } 4661 4662 // utility methods for appending an array with check for duplicates 4663 4664 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4665 const Array<InstanceKlass*>* const ifs) { 4666 // iterate over new interfaces 4667 for (int i = 0; i < ifs->length(); i++) { 4668 InstanceKlass* const e = ifs->at(i); 4669 assert(e->is_klass() && e->is_interface(), "just checking"); 4670 // add new interface 4671 result->append_if_missing(e); 4672 } 4673 } 4674 4675 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4676 Array<InstanceKlass*>* local_ifs, 4677 ClassLoaderData* loader_data, 4678 TRAPS) { 4679 assert(local_ifs != NULL, "invariant"); 4680 assert(loader_data != NULL, "invariant"); 4681 4682 // Compute maximum size for transitive interfaces 4683 int max_transitive_size = 0; 4684 int super_size = 0; 4685 // Add superclass transitive interfaces size 4686 if (super != NULL) { 4687 super_size = super->transitive_interfaces()->length(); 4688 max_transitive_size += super_size; 4689 } 4690 // Add local interfaces' super interfaces 4691 const int local_size = local_ifs->length(); 4692 for (int i = 0; i < local_size; i++) { 4693 InstanceKlass* const l = local_ifs->at(i); 4694 max_transitive_size += l->transitive_interfaces()->length(); 4695 } 4696 // Finally add local interfaces 4697 max_transitive_size += local_size; 4698 // Construct array 4699 if (max_transitive_size == 0) { 4700 // no interfaces, use canonicalized array 4701 return Universe::the_empty_instance_klass_array(); 4702 } else if (max_transitive_size == super_size) { 4703 // no new local interfaces added, share superklass' transitive interface array 4704 return super->transitive_interfaces(); 4705 } else if (max_transitive_size == local_size) { 4706 // only local interfaces added, share local interface array 4707 return local_ifs; 4708 } else { 4709 ResourceMark rm; 4710 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4711 4712 // Copy down from superclass 4713 if (super != NULL) { 4714 append_interfaces(result, super->transitive_interfaces()); 4715 } 4716 4717 // Copy down from local interfaces' superinterfaces 4718 for (int i = 0; i < local_size; i++) { 4719 InstanceKlass* const l = local_ifs->at(i); 4720 append_interfaces(result, l->transitive_interfaces()); 4721 } 4722 // Finally add local interfaces 4723 append_interfaces(result, local_ifs); 4724 4725 // length will be less than the max_transitive_size if duplicates were removed 4726 const int length = result->length(); 4727 assert(length <= max_transitive_size, "just checking"); 4728 Array<InstanceKlass*>* const new_result = 4729 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4730 for (int i = 0; i < length; i++) { 4731 InstanceKlass* const e = result->at(i); 4732 assert(e != NULL, "just checking"); 4733 new_result->at_put(i, e); 4734 } 4735 return new_result; 4736 } 4737 } 4738 4739 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4740 assert(this_klass != NULL, "invariant"); 4741 const Klass* const super = this_klass->super(); 4742 4743 if (super != NULL) { 4744 4745 // If the loader is not the boot loader then throw an exception if its 4746 // superclass is in package jdk.internal.reflect and its loader is not a 4747 // special reflection class loader 4748 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4749 assert(super->is_instance_klass(), "super is not instance klass"); 4750 PackageEntry* super_package = super->package(); 4751 if (super_package != NULL && 4752 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4753 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4754 ResourceMark rm(THREAD); 4755 Exceptions::fthrow( 4756 THREAD_AND_LOCATION, 4757 vmSymbols::java_lang_IllegalAccessError(), 4758 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4759 this_klass->external_name(), 4760 this_klass->class_loader_data()->loader_name_and_id(), 4761 super->external_name()); 4762 return; 4763 } 4764 } 4765 4766 Reflection::VerifyClassAccessResults vca_result = 4767 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4768 if (vca_result != Reflection::ACCESS_OK) { 4769 ResourceMark rm(THREAD); 4770 char* msg = Reflection::verify_class_access_msg(this_klass, 4771 InstanceKlass::cast(super), 4772 vca_result); 4773 if (msg == NULL) { 4774 bool same_module = (this_klass->module() == super->module()); 4775 Exceptions::fthrow( 4776 THREAD_AND_LOCATION, 4777 vmSymbols::java_lang_IllegalAccessError(), 4778 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4779 this_klass->external_name(), 4780 super->is_abstract() ? "abstract " : "", 4781 super->external_name(), 4782 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4783 (same_module) ? "" : "; ", 4784 (same_module) ? "" : super->class_in_module_of_loader()); 4785 } else { 4786 // Add additional message content. 4787 Exceptions::fthrow( 4788 THREAD_AND_LOCATION, 4789 vmSymbols::java_lang_IllegalAccessError(), 4790 "superclass access check failed: %s", 4791 msg); 4792 } 4793 } 4794 } 4795 } 4796 4797 4798 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4799 assert(this_klass != NULL, "invariant"); 4800 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4801 const int lng = local_interfaces->length(); 4802 for (int i = lng - 1; i >= 0; i--) { 4803 InstanceKlass* const k = local_interfaces->at(i); 4804 assert (k != NULL && k->is_interface(), "invalid interface"); 4805 Reflection::VerifyClassAccessResults vca_result = 4806 Reflection::verify_class_access(this_klass, k, false); 4807 if (vca_result != Reflection::ACCESS_OK) { 4808 ResourceMark rm(THREAD); 4809 char* msg = Reflection::verify_class_access_msg(this_klass, 4810 k, 4811 vca_result); 4812 if (msg == NULL) { 4813 bool same_module = (this_klass->module() == k->module()); 4814 Exceptions::fthrow( 4815 THREAD_AND_LOCATION, 4816 vmSymbols::java_lang_IllegalAccessError(), 4817 "class %s cannot access its superinterface %s (%s%s%s)", 4818 this_klass->external_name(), 4819 k->external_name(), 4820 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4821 (same_module) ? "" : "; ", 4822 (same_module) ? "" : k->class_in_module_of_loader()); 4823 } else { 4824 // Add additional message content. 4825 Exceptions::fthrow( 4826 THREAD_AND_LOCATION, 4827 vmSymbols::java_lang_IllegalAccessError(), 4828 "superinterface check failed: %s", 4829 msg); 4830 } 4831 } 4832 } 4833 } 4834 4835 4836 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4837 assert(this_klass != NULL, "invariant"); 4838 const Array<Method*>* const methods = this_klass->methods(); 4839 const int num_methods = methods->length(); 4840 4841 // go thru each method and check if it overrides a final method 4842 for (int index = 0; index < num_methods; index++) { 4843 const Method* const m = methods->at(index); 4844 4845 // skip private, static, and <init> methods 4846 if ((!m->is_private() && !m->is_static()) && 4847 (m->name() != vmSymbols::object_initializer_name())) { 4848 4849 const Symbol* const name = m->name(); 4850 const Symbol* const signature = m->signature(); 4851 const Klass* k = this_klass->super(); 4852 const Method* super_m = NULL; 4853 while (k != NULL) { 4854 // skip supers that don't have final methods. 4855 if (k->has_final_method()) { 4856 // lookup a matching method in the super class hierarchy 4857 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4858 if (super_m == NULL) { 4859 break; // didn't find any match; get out 4860 } 4861 4862 if (super_m->is_final() && !super_m->is_static() && 4863 !super_m->access_flags().is_private()) { 4864 // matching method in super is final, and not static or private 4865 bool can_access = Reflection::verify_member_access(this_klass, 4866 super_m->method_holder(), 4867 super_m->method_holder(), 4868 super_m->access_flags(), 4869 false, false, CHECK); 4870 if (can_access) { 4871 // this class can access super final method and therefore override 4872 ResourceMark rm(THREAD); 4873 Exceptions::fthrow(THREAD_AND_LOCATION, 4874 vmSymbols::java_lang_VerifyError(), 4875 "class %s overrides final method %s.%s%s", 4876 this_klass->external_name(), 4877 super_m->method_holder()->external_name(), 4878 name->as_C_string(), 4879 signature->as_C_string() 4880 ); 4881 return; 4882 } 4883 } 4884 4885 // continue to look from super_m's holder's super. 4886 k = super_m->method_holder()->super(); 4887 continue; 4888 } 4889 4890 k = k->super(); 4891 } 4892 } 4893 } 4894 } 4895 4896 4897 // assumes that this_klass is an interface 4898 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4899 assert(this_klass != NULL, "invariant"); 4900 assert(this_klass->is_interface(), "not an interface"); 4901 const Array<Method*>* methods = this_klass->methods(); 4902 const int num_methods = methods->length(); 4903 4904 for (int index = 0; index < num_methods; index++) { 4905 const Method* const m = methods->at(index); 4906 // if m is static and not the init method, throw a verify error 4907 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4908 ResourceMark rm(THREAD); 4909 Exceptions::fthrow( 4910 THREAD_AND_LOCATION, 4911 vmSymbols::java_lang_VerifyError(), 4912 "Illegal static method %s in interface %s", 4913 m->name()->as_C_string(), 4914 this_klass->external_name() 4915 ); 4916 return; 4917 } 4918 } 4919 } 4920 4921 // utility methods for format checking 4922 4923 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4924 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4925 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4926 if (is_module) { 4927 ResourceMark rm(THREAD); 4928 Exceptions::fthrow( 4929 THREAD_AND_LOCATION, 4930 vmSymbols::java_lang_NoClassDefFoundError(), 4931 "%s is not a class because access_flag ACC_MODULE is set", 4932 _class_name->as_C_string()); 4933 return; 4934 } 4935 4936 if (!_need_verify) { return; } 4937 4938 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4939 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4940 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4941 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4942 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4943 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4944 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 4945 const bool major_gte_14 = _major_version >= JAVA_14_VERSION; 4946 4947 if ((is_abstract && is_final) || 4948 (is_interface && !is_abstract) || 4949 (is_interface && major_gte_1_5 && (is_super || is_enum)) || 4950 (!is_interface && major_gte_1_5 && is_annotation)) { 4951 ResourceMark rm(THREAD); 4952 Exceptions::fthrow( 4953 THREAD_AND_LOCATION, 4954 vmSymbols::java_lang_ClassFormatError(), 4955 "Illegal class modifiers in class %s: 0x%X", 4956 _class_name->as_C_string(), flags 4957 ); 4958 return; 4959 } 4960 } 4961 4962 static bool has_illegal_visibility(jint flags) { 4963 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4964 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4965 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4966 4967 return ((is_public && is_protected) || 4968 (is_public && is_private) || 4969 (is_protected && is_private)); 4970 } 4971 4972 // A legal major_version.minor_version must be one of the following: 4973 // 4974 // Major_version >= 45 and major_version < 56, any minor_version. 4975 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. 4976 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. 4977 // 4978 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4979 ResourceMark rm(THREAD); 4980 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4981 if (major < JAVA_MIN_SUPPORTED_VERSION) { 4982 Exceptions::fthrow( 4983 THREAD_AND_LOCATION, 4984 vmSymbols::java_lang_UnsupportedClassVersionError(), 4985 "%s (class file version %u.%u) was compiled with an invalid major version", 4986 class_name->as_C_string(), major, minor); 4987 return; 4988 } 4989 4990 if (major > max_version) { 4991 Exceptions::fthrow( 4992 THREAD_AND_LOCATION, 4993 vmSymbols::java_lang_UnsupportedClassVersionError(), 4994 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4995 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4996 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4997 return; 4998 } 4999 5000 if (major < JAVA_12_VERSION || minor == 0) { 5001 return; 5002 } 5003 5004 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 5005 if (major != max_version) { 5006 Exceptions::fthrow( 5007 THREAD_AND_LOCATION, 5008 vmSymbols::java_lang_UnsupportedClassVersionError(), 5009 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 5010 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 5011 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 5012 return; 5013 } 5014 5015 if (!Arguments::enable_preview()) { 5016 Exceptions::fthrow( 5017 THREAD_AND_LOCATION, 5018 vmSymbols::java_lang_UnsupportedClassVersionError(), 5019 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 5020 class_name->as_C_string(), major, minor); 5021 return; 5022 } 5023 5024 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 5025 Exceptions::fthrow( 5026 THREAD_AND_LOCATION, 5027 vmSymbols::java_lang_UnsupportedClassVersionError(), 5028 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 5029 class_name->as_C_string(), major, minor); 5030 } 5031 } 5032 5033 void ClassFileParser::verify_legal_field_modifiers(jint flags, 5034 bool is_interface, 5035 TRAPS) const { 5036 if (!_need_verify) { return; } 5037 5038 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 5039 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 5040 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 5041 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 5042 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5043 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 5044 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 5045 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 5046 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 5047 5048 bool is_illegal = false; 5049 5050 if (is_interface) { 5051 if (!is_public || !is_static || !is_final || is_private || 5052 is_protected || is_volatile || is_transient || 5053 (major_gte_1_5 && is_enum)) { 5054 is_illegal = true; 5055 } 5056 } else { // not interface 5057 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 5058 is_illegal = true; 5059 } 5060 } 5061 5062 if (is_illegal) { 5063 ResourceMark rm(THREAD); 5064 Exceptions::fthrow( 5065 THREAD_AND_LOCATION, 5066 vmSymbols::java_lang_ClassFormatError(), 5067 "Illegal field modifiers in class %s: 0x%X", 5068 _class_name->as_C_string(), flags); 5069 return; 5070 } 5071 } 5072 5073 void ClassFileParser::verify_legal_method_modifiers(jint flags, 5074 bool is_interface, 5075 const Symbol* name, 5076 TRAPS) const { 5077 if (!_need_verify) { return; } 5078 5079 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 5080 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 5081 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 5082 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5083 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 5084 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 5085 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 5086 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 5087 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 5088 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 5089 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; 5090 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 5091 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 5092 5093 bool is_illegal = false; 5094 5095 if (is_interface) { 5096 if (major_gte_8) { 5097 // Class file version is JAVA_8_VERSION or later Methods of 5098 // interfaces may set any of the flags except ACC_PROTECTED, 5099 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 5100 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 5101 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 5102 (is_native || is_protected || is_final || is_synchronized) || 5103 // If a specific method of a class or interface has its 5104 // ACC_ABSTRACT flag set, it must not have any of its 5105 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 5106 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 5107 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 5108 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 5109 (is_abstract && (is_private || is_static || is_strict))) { 5110 is_illegal = true; 5111 } 5112 } else if (major_gte_1_5) { 5113 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 5114 if (!is_public || is_private || is_protected || is_static || is_final || 5115 is_synchronized || is_native || !is_abstract || is_strict) { 5116 is_illegal = true; 5117 } 5118 } else { 5119 // Class file version is pre-JAVA_1_5_VERSION 5120 if (!is_public || is_static || is_final || is_native || !is_abstract) { 5121 is_illegal = true; 5122 } 5123 } 5124 } else { // not interface 5125 if (has_illegal_visibility(flags)) { 5126 is_illegal = true; 5127 } else { 5128 if (is_initializer) { 5129 if (is_static || is_final || is_synchronized || is_native || 5130 is_abstract || (major_gte_1_5 && is_bridge)) { 5131 is_illegal = true; 5132 } 5133 } else { // not initializer 5134 if (is_abstract) { 5135 if ((is_final || is_native || is_private || is_static || 5136 (major_gte_1_5 && (is_synchronized || is_strict)))) { 5137 is_illegal = true; 5138 } 5139 } 5140 } 5141 } 5142 } 5143 5144 if (is_illegal) { 5145 ResourceMark rm(THREAD); 5146 Exceptions::fthrow( 5147 THREAD_AND_LOCATION, 5148 vmSymbols::java_lang_ClassFormatError(), 5149 "Method %s in class %s has illegal modifiers: 0x%X", 5150 name->as_C_string(), _class_name->as_C_string(), flags); 5151 return; 5152 } 5153 } 5154 5155 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 5156 int length, 5157 TRAPS) const { 5158 assert(_need_verify, "only called when _need_verify is true"); 5159 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 5160 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5161 } 5162 } 5163 5164 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5165 // In class names, '/' separates unqualified names. This is verified in this function also. 5166 // Method names also may not contain the characters '<' or '>', unless <init> 5167 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5168 // method. Because these names have been checked as special cases before 5169 // calling this method in verify_legal_method_name. 5170 // 5171 // This method is also called from the modular system APIs in modules.cpp 5172 // to verify the validity of module and package names. 5173 bool ClassFileParser::verify_unqualified_name(const char* name, 5174 unsigned int length, 5175 int type) { 5176 if (length == 0) return false; // Must have at least one char. 5177 for (const char* p = name; p != name + length; p++) { 5178 switch(*p) { 5179 case JVM_SIGNATURE_DOT: 5180 case JVM_SIGNATURE_ENDCLASS: 5181 case JVM_SIGNATURE_ARRAY: 5182 // do not permit '.', ';', or '[' 5183 return false; 5184 case JVM_SIGNATURE_SLASH: 5185 // check for '//' or leading or trailing '/' which are not legal 5186 // unqualified name must not be empty 5187 if (type == ClassFileParser::LegalClass) { 5188 if (p == name || p+1 >= name+length || 5189 *(p+1) == JVM_SIGNATURE_SLASH) { 5190 return false; 5191 } 5192 } else { 5193 return false; // do not permit '/' unless it's class name 5194 } 5195 break; 5196 case JVM_SIGNATURE_SPECIAL: 5197 case JVM_SIGNATURE_ENDSPECIAL: 5198 // do not permit '<' or '>' in method names 5199 if (type == ClassFileParser::LegalMethod) { 5200 return false; 5201 } 5202 } 5203 } 5204 return true; 5205 } 5206 5207 // Take pointer to a UTF8 byte string (not NUL-terminated). 5208 // Skip over the longest part of the string that could 5209 // be taken as a fieldname. Allow '/' if slash_ok is true. 5210 // Return a pointer to just past the fieldname. 5211 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5212 // being true, we saw consecutive slashes (meaning we were looking for a 5213 // qualified path but found something that was badly-formed). 5214 static const char* skip_over_field_name(const char* const name, 5215 bool slash_ok, 5216 unsigned int length) { 5217 const char* p; 5218 jboolean last_is_slash = false; 5219 jboolean not_first_ch = false; 5220 5221 for (p = name; p != name + length; not_first_ch = true) { 5222 const char* old_p = p; 5223 jchar ch = *p; 5224 if (ch < 128) { 5225 p++; 5226 // quick check for ascii 5227 if ((ch >= 'a' && ch <= 'z') || 5228 (ch >= 'A' && ch <= 'Z') || 5229 (ch == '_' || ch == '$') || 5230 (not_first_ch && ch >= '0' && ch <= '9')) { 5231 last_is_slash = false; 5232 continue; 5233 } 5234 if (slash_ok && ch == JVM_SIGNATURE_SLASH) { 5235 if (last_is_slash) { 5236 return NULL; // Don't permit consecutive slashes 5237 } 5238 last_is_slash = true; 5239 continue; 5240 } 5241 } 5242 else { 5243 jint unicode_ch; 5244 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5245 p = tmp_p; 5246 last_is_slash = false; 5247 // Check if ch is Java identifier start or is Java identifier part 5248 // 4672820: call java.lang.Character methods directly without generating separate tables. 5249 EXCEPTION_MARK; 5250 // return value 5251 JavaValue result(T_BOOLEAN); 5252 // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart 5253 JavaCallArguments args; 5254 args.push_int(unicode_ch); 5255 5256 if (not_first_ch) { 5257 // public static boolean isJavaIdentifierPart(char ch); 5258 JavaCalls::call_static(&result, 5259 SystemDictionary::Character_klass(), 5260 vmSymbols::isJavaIdentifierPart_name(), 5261 vmSymbols::int_bool_signature(), 5262 &args, 5263 THREAD); 5264 } else { 5265 // public static boolean isJavaIdentifierStart(char ch); 5266 JavaCalls::call_static(&result, 5267 SystemDictionary::Character_klass(), 5268 vmSymbols::isJavaIdentifierStart_name(), 5269 vmSymbols::int_bool_signature(), 5270 &args, 5271 THREAD); 5272 } 5273 if (HAS_PENDING_EXCEPTION) { 5274 CLEAR_PENDING_EXCEPTION; 5275 return NULL; 5276 } 5277 if(result.get_jboolean()) { 5278 continue; 5279 } 5280 } 5281 return (not_first_ch) ? old_p : NULL; 5282 } 5283 return (not_first_ch) ? p : NULL; 5284 } 5285 5286 // Take pointer to a UTF8 byte string (not NUL-terminated). 5287 // Skip over the longest part of the string that could 5288 // be taken as a field signature. Allow "void" if void_ok. 5289 // Return a pointer to just past the signature. 5290 // Return NULL if no legal signature is found. 5291 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5292 bool void_ok, 5293 unsigned int length, 5294 TRAPS) const { 5295 unsigned int array_dim = 0; 5296 while (length > 0) { 5297 switch (signature[0]) { 5298 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5299 case JVM_SIGNATURE_BOOLEAN: 5300 case JVM_SIGNATURE_BYTE: 5301 case JVM_SIGNATURE_CHAR: 5302 case JVM_SIGNATURE_SHORT: 5303 case JVM_SIGNATURE_INT: 5304 case JVM_SIGNATURE_FLOAT: 5305 case JVM_SIGNATURE_LONG: 5306 case JVM_SIGNATURE_DOUBLE: 5307 return signature + 1; 5308 case JVM_SIGNATURE_CLASS: { 5309 if (_major_version < JAVA_1_5_VERSION) { 5310 // Skip over the class name if one is there 5311 const char* const p = skip_over_field_name(signature + 1, true, --length); 5312 5313 // The next character better be a semicolon 5314 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) { 5315 return p + 1; 5316 } 5317 } 5318 else { 5319 // Skip leading 'L' and ignore first appearance of ';' 5320 signature++; 5321 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); 5322 // Format check signature 5323 if (c != NULL) { 5324 int newlen = c - (char*) signature; 5325 bool legal = verify_unqualified_name(signature, newlen, LegalClass); 5326 if (!legal) { 5327 classfile_parse_error("Class name is empty or contains illegal character " 5328 "in descriptor in class file %s", 5329 CHECK_0); 5330 return NULL; 5331 } 5332 return signature + newlen + 1; 5333 } 5334 } 5335 return NULL; 5336 } 5337 case JVM_SIGNATURE_ARRAY: 5338 array_dim++; 5339 if (array_dim > 255) { 5340 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5341 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5342 } 5343 // The rest of what's there better be a legal signature 5344 signature++; 5345 length--; 5346 void_ok = false; 5347 break; 5348 default: 5349 return NULL; 5350 } 5351 } 5352 return NULL; 5353 } 5354 5355 // Checks if name is a legal class name. 5356 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5357 if (!_need_verify || _relax_verify) { return; } 5358 5359 assert(name->refcount() > 0, "symbol must be kept alive"); 5360 char* bytes = (char*)name->bytes(); 5361 unsigned int length = name->utf8_length(); 5362 bool legal = false; 5363 5364 if (length > 0) { 5365 const char* p; 5366 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5367 p = skip_over_field_signature(bytes, false, length, CHECK); 5368 legal = (p != NULL) && ((p - bytes) == (int)length); 5369 } else if (_major_version < JAVA_1_5_VERSION) { 5370 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5371 p = skip_over_field_name(bytes, true, length); 5372 legal = (p != NULL) && ((p - bytes) == (int)length); 5373 } 5374 } else { 5375 // 4900761: relax the constraints based on JSR202 spec 5376 // Class names may be drawn from the entire Unicode character set. 5377 // Identifiers between '/' must be unqualified names. 5378 // The utf8 string has been verified when parsing cpool entries. 5379 legal = verify_unqualified_name(bytes, length, LegalClass); 5380 } 5381 } 5382 if (!legal) { 5383 ResourceMark rm(THREAD); 5384 assert(_class_name != NULL, "invariant"); 5385 Exceptions::fthrow( 5386 THREAD_AND_LOCATION, 5387 vmSymbols::java_lang_ClassFormatError(), 5388 "Illegal class name \"%.*s\" in class file %s", length, bytes, 5389 _class_name->as_C_string() 5390 ); 5391 return; 5392 } 5393 } 5394 5395 // Checks if name is a legal field name. 5396 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5397 if (!_need_verify || _relax_verify) { return; } 5398 5399 char* bytes = (char*)name->bytes(); 5400 unsigned int length = name->utf8_length(); 5401 bool legal = false; 5402 5403 if (length > 0) { 5404 if (_major_version < JAVA_1_5_VERSION) { 5405 if (bytes[0] != JVM_SIGNATURE_SPECIAL) { 5406 const char* p = skip_over_field_name(bytes, false, length); 5407 legal = (p != NULL) && ((p - bytes) == (int)length); 5408 } 5409 } else { 5410 // 4881221: relax the constraints based on JSR202 spec 5411 legal = verify_unqualified_name(bytes, length, LegalField); 5412 } 5413 } 5414 5415 if (!legal) { 5416 ResourceMark rm(THREAD); 5417 assert(_class_name != NULL, "invariant"); 5418 Exceptions::fthrow( 5419 THREAD_AND_LOCATION, 5420 vmSymbols::java_lang_ClassFormatError(), 5421 "Illegal field name \"%.*s\" in class %s", length, bytes, 5422 _class_name->as_C_string() 5423 ); 5424 return; 5425 } 5426 } 5427 5428 // Checks if name is a legal method name. 5429 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5430 if (!_need_verify || _relax_verify) { return; } 5431 5432 assert(name != NULL, "method name is null"); 5433 char* bytes = (char*)name->bytes(); 5434 unsigned int length = name->utf8_length(); 5435 bool legal = false; 5436 5437 if (length > 0) { 5438 if (bytes[0] == JVM_SIGNATURE_SPECIAL) { 5439 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5440 legal = true; 5441 } 5442 } else if (_major_version < JAVA_1_5_VERSION) { 5443 const char* p; 5444 p = skip_over_field_name(bytes, false, length); 5445 legal = (p != NULL) && ((p - bytes) == (int)length); 5446 } else { 5447 // 4881221: relax the constraints based on JSR202 spec 5448 legal = verify_unqualified_name(bytes, length, LegalMethod); 5449 } 5450 } 5451 5452 if (!legal) { 5453 ResourceMark rm(THREAD); 5454 assert(_class_name != NULL, "invariant"); 5455 Exceptions::fthrow( 5456 THREAD_AND_LOCATION, 5457 vmSymbols::java_lang_ClassFormatError(), 5458 "Illegal method name \"%.*s\" in class %s", length, bytes, 5459 _class_name->as_C_string() 5460 ); 5461 return; 5462 } 5463 } 5464 5465 5466 // Checks if signature is a legal field signature. 5467 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5468 const Symbol* signature, 5469 TRAPS) const { 5470 if (!_need_verify) { return; } 5471 5472 const char* const bytes = (const char* const)signature->bytes(); 5473 const unsigned int length = signature->utf8_length(); 5474 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5475 5476 if (p == NULL || (p - bytes) != (int)length) { 5477 throwIllegalSignature("Field", name, signature, CHECK); 5478 } 5479 } 5480 5481 // Checks if signature is a legal method signature. 5482 // Returns number of parameters 5483 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5484 const Symbol* signature, 5485 TRAPS) const { 5486 if (!_need_verify) { 5487 // make sure caller's args_size will be less than 0 even for non-static 5488 // method so it will be recomputed in compute_size_of_parameters(). 5489 return -2; 5490 } 5491 5492 // Class initializers cannot have args for class format version >= 51. 5493 if (name == vmSymbols::class_initializer_name() && 5494 signature != vmSymbols::void_method_signature() && 5495 _major_version >= JAVA_7_VERSION) { 5496 throwIllegalSignature("Method", name, signature, CHECK_0); 5497 return 0; 5498 } 5499 5500 unsigned int args_size = 0; 5501 const char* p = (const char*)signature->bytes(); 5502 unsigned int length = signature->utf8_length(); 5503 const char* nextp; 5504 5505 // The first character must be a '(' 5506 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5507 length--; 5508 // Skip over legal field signatures 5509 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5510 while ((length > 0) && (nextp != NULL)) { 5511 args_size++; 5512 if (p[0] == 'J' || p[0] == 'D') { 5513 args_size++; 5514 } 5515 length -= nextp - p; 5516 p = nextp; 5517 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5518 } 5519 // The first non-signature thing better be a ')' 5520 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5521 length--; 5522 if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) { 5523 // All internal methods must return void 5524 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5525 return args_size; 5526 } 5527 } else { 5528 // Now we better just have a return value 5529 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5530 if (nextp && ((int)length == (nextp - p))) { 5531 return args_size; 5532 } 5533 } 5534 } 5535 } 5536 // Report error 5537 throwIllegalSignature("Method", name, signature, CHECK_0); 5538 return 0; 5539 } 5540 5541 int ClassFileParser::static_field_size() const { 5542 assert(_field_info != NULL, "invariant"); 5543 return _field_info->static_field_size; 5544 } 5545 5546 int ClassFileParser::total_oop_map_count() const { 5547 assert(_field_info != NULL, "invariant"); 5548 return _field_info->total_oop_map_count; 5549 } 5550 5551 jint ClassFileParser::layout_size() const { 5552 assert(_field_info != NULL, "invariant"); 5553 return _field_info->instance_size; 5554 } 5555 5556 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5557 const Array<Method*>* methods) { 5558 assert(ik != NULL, "invariant"); 5559 assert(methods != NULL, "invariant"); 5560 5561 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5562 // (We used to do this lazily, but now we query it in Rewriter, 5563 // which is eagerly done for every method, so we might as well do it now, 5564 // when everything is fresh in memory.) 5565 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5566 5567 if (klass_id != vmSymbols::NO_SID) { 5568 for (int j = 0; j < methods->length(); ++j) { 5569 Method* method = methods->at(j); 5570 method->init_intrinsic_id(); 5571 5572 if (CheckIntrinsics) { 5573 // Check if an intrinsic is defined for method 'method', 5574 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5575 if (method->intrinsic_id() != vmIntrinsics::_none && 5576 !method->intrinsic_candidate()) { 5577 tty->print("Compiler intrinsic is defined for method [%s], " 5578 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5579 method->name_and_sig_as_C_string(), 5580 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5581 ); 5582 tty->cr(); 5583 DEBUG_ONLY(vm_exit(1)); 5584 } 5585 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5586 // but there is no intrinsic available for it. 5587 if (method->intrinsic_candidate() && 5588 method->intrinsic_id() == vmIntrinsics::_none) { 5589 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5590 "but no compiler intrinsic is defined for the method.%s", 5591 method->name_and_sig_as_C_string(), 5592 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5593 ); 5594 tty->cr(); 5595 DEBUG_ONLY(vm_exit(1)); 5596 } 5597 } 5598 } // end for 5599 5600 #ifdef ASSERT 5601 if (CheckIntrinsics) { 5602 // Check for orphan methods in the current class. A method m 5603 // of a class C is orphan if an intrinsic is defined for method m, 5604 // but class C does not declare m. 5605 // The check is potentially expensive, therefore it is available 5606 // only in debug builds. 5607 5608 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5609 if (vmIntrinsics::_compiledLambdaForm == id) { 5610 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5611 // generated for the JVM from a LambdaForm and therefore no method 5612 // is defined for it. 5613 continue; 5614 } 5615 5616 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5617 // Check if the current class contains a method with the same 5618 // name, flags, signature. 5619 bool match = false; 5620 for (int j = 0; j < methods->length(); ++j) { 5621 const Method* method = methods->at(j); 5622 if (method->intrinsic_id() == id) { 5623 match = true; 5624 break; 5625 } 5626 } 5627 5628 if (!match) { 5629 char buf[1000]; 5630 tty->print("Compiler intrinsic is defined for method [%s], " 5631 "but the method is not available in class [%s].%s", 5632 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5633 buf, sizeof(buf)), 5634 ik->name()->as_C_string(), 5635 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5636 ); 5637 tty->cr(); 5638 DEBUG_ONLY(vm_exit(1)); 5639 } 5640 } 5641 } // end for 5642 } // CheckIntrinsics 5643 #endif // ASSERT 5644 } 5645 } 5646 5647 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5648 if (_klass != NULL) { 5649 return _klass; 5650 } 5651 5652 InstanceKlass* const ik = 5653 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5654 5655 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5656 5657 assert(_klass == ik, "invariant"); 5658 5659 5660 if (ik->should_store_fingerprint()) { 5661 ik->store_fingerprint(_stream->compute_fingerprint()); 5662 } 5663 5664 ik->set_has_passed_fingerprint_check(false); 5665 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5666 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5667 uint64_t fp = ik->has_stored_fingerprint() ? ik->get_stored_fingerprint() : _stream->compute_fingerprint(); 5668 if (aot_fp != 0 && aot_fp == fp) { 5669 // This class matches with a class saved in an AOT library 5670 ik->set_has_passed_fingerprint_check(true); 5671 } else { 5672 ResourceMark rm; 5673 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5674 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5675 } 5676 } 5677 5678 return ik; 5679 } 5680 5681 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5682 assert(ik != NULL, "invariant"); 5683 5684 // Set name and CLD before adding to CLD 5685 ik->set_class_loader_data(_loader_data); 5686 ik->set_name(_class_name); 5687 5688 // Add all classes to our internal class loader list here, 5689 // including classes in the bootstrap (NULL) class loader. 5690 const bool publicize = !is_internal(); 5691 5692 _loader_data->add_class(ik, publicize); 5693 5694 set_klass_to_deallocate(ik); 5695 5696 assert(_field_info != NULL, "invariant"); 5697 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5698 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count, 5699 "sanity"); 5700 5701 assert(ik->is_instance_klass(), "sanity"); 5702 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5703 5704 // Fill in information already parsed 5705 ik->set_should_verify_class(_need_verify); 5706 5707 // Not yet: supers are done below to support the new subtype-checking fields 5708 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5709 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5710 assert(_fac != NULL, "invariant"); 5711 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]); 5712 5713 // this transfers ownership of a lot of arrays from 5714 // the parser onto the InstanceKlass* 5715 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5716 5717 // note that is not safe to use the fields in the parser from this point on 5718 assert(NULL == _cp, "invariant"); 5719 assert(NULL == _fields, "invariant"); 5720 assert(NULL == _methods, "invariant"); 5721 assert(NULL == _inner_classes, "invariant"); 5722 assert(NULL == _nest_members, "invariant"); 5723 assert(NULL == _local_interfaces, "invariant"); 5724 assert(NULL == _combined_annotations, "invariant"); 5725 assert(NULL == _record_components, "invariant"); 5726 5727 if (_has_final_method) { 5728 ik->set_has_final_method(); 5729 } 5730 5731 ik->copy_method_ordering(_method_ordering, CHECK); 5732 // The InstanceKlass::_methods_jmethod_ids cache 5733 // is managed on the assumption that the initial cache 5734 // size is equal to the number of methods in the class. If 5735 // that changes, then InstanceKlass::idnum_can_increment() 5736 // has to be changed accordingly. 5737 ik->set_initial_method_idnum(ik->methods()->length()); 5738 5739 ik->set_this_class_index(_this_class_index); 5740 5741 if (is_unsafe_anonymous()) { 5742 // _this_class_index is a CONSTANT_Class entry that refers to this 5743 // anonymous class itself. If this class needs to refer to its own methods or 5744 // fields, it would use a CONSTANT_MethodRef, etc, which would reference 5745 // _this_class_index. However, because this class is anonymous (it's 5746 // not stored in SystemDictionary), _this_class_index cannot be resolved 5747 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5748 // Therefore, we must eagerly resolve _this_class_index now. 5749 ik->constants()->klass_at_put(_this_class_index, ik); 5750 } 5751 5752 ik->set_minor_version(_minor_version); 5753 ik->set_major_version(_major_version); 5754 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5755 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5756 5757 if (_unsafe_anonymous_host != NULL) { 5758 assert (ik->is_unsafe_anonymous(), "should be the same"); 5759 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host); 5760 } 5761 5762 // Set PackageEntry for this_klass 5763 oop cl = ik->class_loader(); 5764 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5765 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5766 ik->set_package(cld, CHECK); 5767 5768 const Array<Method*>* const methods = ik->methods(); 5769 assert(methods != NULL, "invariant"); 5770 const int methods_len = methods->length(); 5771 5772 check_methods_for_intrinsics(ik, methods); 5773 5774 // Fill in field values obtained by parse_classfile_attributes 5775 if (_parsed_annotations->has_any_annotations()) { 5776 _parsed_annotations->apply_to(ik); 5777 } 5778 5779 apply_parsed_class_attributes(ik); 5780 5781 // Miranda methods 5782 if ((_num_miranda_methods > 0) || 5783 // if this class introduced new miranda methods or 5784 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5785 // super class exists and this class inherited miranda methods 5786 ) { 5787 ik->set_has_miranda_methods(); // then set a flag 5788 } 5789 5790 // Fill in information needed to compute superclasses. 5791 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5792 ik->set_transitive_interfaces(_transitive_interfaces); 5793 _transitive_interfaces = NULL; 5794 5795 // Initialize itable offset tables 5796 klassItable::setup_itable_offset_table(ik); 5797 5798 // Compute transitive closure of interfaces this class implements 5799 // Do final class setup 5800 fill_oop_maps(ik, 5801 _field_info->nonstatic_oop_map_count, 5802 _field_info->nonstatic_oop_offsets, 5803 _field_info->nonstatic_oop_counts); 5804 5805 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5806 set_precomputed_flags(ik); 5807 5808 // check if this class can access its super class 5809 check_super_class_access(ik, CHECK); 5810 5811 // check if this class can access its superinterfaces 5812 check_super_interface_access(ik, CHECK); 5813 5814 // check if this class overrides any final method 5815 check_final_method_override(ik, CHECK); 5816 5817 // reject static interface methods prior to Java 8 5818 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5819 check_illegal_static_method(ik, CHECK); 5820 } 5821 5822 // Obtain this_klass' module entry 5823 ModuleEntry* module_entry = ik->module(); 5824 assert(module_entry != NULL, "module_entry should always be set"); 5825 5826 // Obtain java.lang.Module 5827 Handle module_handle(THREAD, module_entry->module()); 5828 5829 // Allocate mirror and initialize static fields 5830 // The create_mirror() call will also call compute_modifiers() 5831 java_lang_Class::create_mirror(ik, 5832 Handle(THREAD, _loader_data->class_loader()), 5833 module_handle, 5834 _protection_domain, 5835 CHECK); 5836 5837 assert(_all_mirandas != NULL, "invariant"); 5838 5839 // Generate any default methods - default methods are public interface methods 5840 // that have a default implementation. This is new with Java 8. 5841 if (_has_nonstatic_concrete_methods) { 5842 DefaultMethods::generate_default_methods(ik, 5843 _all_mirandas, 5844 CHECK); 5845 } 5846 5847 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5848 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5849 !module_entry->has_default_read_edges()) { 5850 if (!module_entry->set_has_default_read_edges()) { 5851 // We won a potential race 5852 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5853 } 5854 } 5855 5856 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5857 5858 if (!is_internal()) { 5859 if (log_is_enabled(Info, class, load)) { 5860 ResourceMark rm; 5861 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5862 ik->print_class_load_logging(_loader_data, module_name, _stream); 5863 } 5864 5865 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5866 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && 5867 log_is_enabled(Info, class, preview)) { 5868 ResourceMark rm; 5869 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", 5870 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); 5871 } 5872 5873 if (log_is_enabled(Debug, class, resolve)) { 5874 ResourceMark rm; 5875 // print out the superclass. 5876 const char * from = ik->external_name(); 5877 if (ik->java_super() != NULL) { 5878 log_debug(class, resolve)("%s %s (super)", 5879 from, 5880 ik->java_super()->external_name()); 5881 } 5882 // print out each of the interface classes referred to by this class. 5883 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5884 if (local_interfaces != NULL) { 5885 const int length = local_interfaces->length(); 5886 for (int i = 0; i < length; i++) { 5887 const InstanceKlass* const k = local_interfaces->at(i); 5888 const char * to = k->external_name(); 5889 log_debug(class, resolve)("%s %s (interface)", from, to); 5890 } 5891 } 5892 } 5893 } 5894 5895 JFR_ONLY(INIT_ID(ik);) 5896 5897 // If we reach here, all is well. 5898 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5899 // in order for it to not be destroyed in the ClassFileParser destructor. 5900 set_klass_to_deallocate(NULL); 5901 5902 // it's official 5903 set_klass(ik); 5904 5905 debug_only(ik->verify();) 5906 } 5907 5908 void ClassFileParser::update_class_name(Symbol* new_class_name) { 5909 // Decrement the refcount in the old name, since we're clobbering it. 5910 _class_name->decrement_refcount(); 5911 5912 _class_name = new_class_name; 5913 // Increment the refcount of the new name. 5914 // Now the ClassFileParser owns this name and will decrement in 5915 // the destructor. 5916 _class_name->increment_refcount(); 5917 } 5918 5919 5920 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's 5921 // package by prepending its host class's package name to its class name and setting 5922 // its _class_name field. 5923 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) { 5924 ResourceMark rm(THREAD); 5925 assert(strrchr(_class_name->as_C_string(), JVM_SIGNATURE_SLASH) == NULL, 5926 "Unsafe anonymous class should not be in a package"); 5927 const char* host_pkg_name = 5928 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL); 5929 5930 if (host_pkg_name != NULL) { 5931 int host_pkg_len = (int)strlen(host_pkg_name); 5932 int class_name_len = _class_name->utf8_length(); 5933 int symbol_len = host_pkg_len + 1 + class_name_len; 5934 char* new_anon_name = NEW_RESOURCE_ARRAY(char, symbol_len + 1); 5935 int n = os::snprintf(new_anon_name, symbol_len + 1, "%s/%.*s", 5936 host_pkg_name, class_name_len, _class_name->base()); 5937 assert(n == symbol_len, "Unexpected number of characters in string"); 5938 5939 // Decrement old _class_name to avoid leaking. 5940 _class_name->decrement_refcount(); 5941 5942 // Create a symbol and update the anonymous class name. 5943 // The new class name is created with a refcount of one. When installed into the InstanceKlass, 5944 // it'll be two and when the ClassFileParser destructor runs, it'll go back to one and get deleted 5945 // when the class is unloaded. 5946 _class_name = SymbolTable::new_symbol(new_anon_name, symbol_len); 5947 } 5948 } 5949 5950 // If the host class and the anonymous class are in the same package then do 5951 // nothing. If the anonymous class is in the unnamed package then move it to its 5952 // host's package. If the classes are in different packages then throw an IAE 5953 // exception. 5954 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) { 5955 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class"); 5956 5957 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(), 5958 _class_name->utf8_length(), JVM_SIGNATURE_SLASH); 5959 if (anon_last_slash == NULL) { // Unnamed package 5960 prepend_host_package_name(_unsafe_anonymous_host, CHECK); 5961 } else { 5962 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) { 5963 ResourceMark rm(THREAD); 5964 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5965 err_msg("Host class %s and anonymous class %s are in different packages", 5966 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string())); 5967 } 5968 } 5969 } 5970 5971 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5972 bool trusted = (loader_data->is_the_null_class_loader_data() || 5973 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 5974 bool need_verify = 5975 // verifyAll 5976 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5977 // verifyRemote 5978 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5979 return !need_verify; 5980 } 5981 5982 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5983 Symbol* name, 5984 ClassLoaderData* loader_data, 5985 Handle protection_domain, 5986 const InstanceKlass* unsafe_anonymous_host, 5987 GrowableArray<Handle>* cp_patches, 5988 Publicity pub_level, 5989 TRAPS) : 5990 _stream(stream), 5991 _requested_name(name), 5992 _class_name(NULL), 5993 _loader_data(loader_data), 5994 _unsafe_anonymous_host(unsafe_anonymous_host), 5995 _cp_patches(cp_patches), 5996 _num_patched_klasses(0), 5997 _max_num_patched_klasses(0), 5998 _orig_cp_size(0), 5999 _first_patched_klass_resolved_index(0), 6000 _super_klass(), 6001 _cp(NULL), 6002 _fields(NULL), 6003 _methods(NULL), 6004 _inner_classes(NULL), 6005 _nest_members(NULL), 6006 _nest_host(0), 6007 _record_components(NULL), 6008 _local_interfaces(NULL), 6009 _transitive_interfaces(NULL), 6010 _combined_annotations(NULL), 6011 _class_annotations(NULL), 6012 _class_type_annotations(NULL), 6013 _fields_annotations(NULL), 6014 _fields_type_annotations(NULL), 6015 _klass(NULL), 6016 _klass_to_deallocate(NULL), 6017 _parsed_annotations(NULL), 6018 _fac(NULL), 6019 _field_info(NULL), 6020 _method_ordering(NULL), 6021 _all_mirandas(NULL), 6022 _vtable_size(0), 6023 _itable_size(0), 6024 _num_miranda_methods(0), 6025 _rt(REF_NONE), 6026 _protection_domain(protection_domain), 6027 _access_flags(), 6028 _pub_level(pub_level), 6029 _bad_constant_seen(0), 6030 _synthetic_flag(false), 6031 _sde_length(false), 6032 _sde_buffer(NULL), 6033 _sourcefile_index(0), 6034 _generic_signature_index(0), 6035 _major_version(0), 6036 _minor_version(0), 6037 _this_class_index(0), 6038 _super_class_index(0), 6039 _itfs_len(0), 6040 _java_fields_count(0), 6041 _need_verify(false), 6042 _relax_verify(false), 6043 _has_nonstatic_concrete_methods(false), 6044 _declares_nonstatic_concrete_methods(false), 6045 _has_final_method(false), 6046 _has_finalizer(false), 6047 _has_empty_finalizer(false), 6048 _has_vanilla_constructor(false), 6049 _max_bootstrap_specifier_index(-1) { 6050 6051 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 6052 _class_name->increment_refcount(); 6053 6054 assert(THREAD->is_Java_thread(), "invariant"); 6055 assert(_loader_data != NULL, "invariant"); 6056 assert(stream != NULL, "invariant"); 6057 assert(_stream != NULL, "invariant"); 6058 assert(_stream->buffer() == _stream->current(), "invariant"); 6059 assert(_class_name != NULL, "invariant"); 6060 assert(0 == _access_flags.as_int(), "invariant"); 6061 6062 // Figure out whether we can skip format checking (matching classic VM behavior) 6063 if (DumpSharedSpaces) { 6064 // verify == true means it's a 'remote' class (i.e., non-boot class) 6065 // Verification decision is based on BytecodeVerificationRemote flag 6066 // for those classes. 6067 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 6068 BytecodeVerificationLocal; 6069 } 6070 else { 6071 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 6072 stream->need_verify()); 6073 } 6074 if (_cp_patches != NULL) { 6075 int len = _cp_patches->length(); 6076 for (int i=0; i<len; i++) { 6077 if (has_cp_patch_at(i)) { 6078 Handle patch = cp_patch_at(i); 6079 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 6080 // We need to append the names of the patched classes to the end of the constant pool, 6081 // because a patched class may have a Utf8 name that's not already included in the 6082 // original constant pool. These class names are used when patch_constant_pool() 6083 // calls patch_class(). 6084 // 6085 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 6086 // At this point, we don't know the tag for index i yet, because we haven't parsed the 6087 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 6088 _max_num_patched_klasses++; 6089 } 6090 } 6091 } 6092 } 6093 6094 // synch back verification state to stream 6095 stream->set_verify(_need_verify); 6096 6097 // Check if verification needs to be relaxed for this class file 6098 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 6099 _relax_verify = relax_format_check_for(_loader_data); 6100 6101 parse_stream(stream, CHECK); 6102 6103 post_process_parsed_stream(stream, _cp, CHECK); 6104 } 6105 6106 void ClassFileParser::clear_class_metadata() { 6107 // metadata created before the instance klass is created. Must be 6108 // deallocated if classfile parsing returns an error. 6109 _cp = NULL; 6110 _fields = NULL; 6111 _methods = NULL; 6112 _inner_classes = NULL; 6113 _nest_members = NULL; 6114 _local_interfaces = NULL; 6115 _combined_annotations = NULL; 6116 _class_annotations = _class_type_annotations = NULL; 6117 _fields_annotations = _fields_type_annotations = NULL; 6118 _record_components = NULL; 6119 } 6120 6121 // Destructor to clean up 6122 ClassFileParser::~ClassFileParser() { 6123 _class_name->decrement_refcount(); 6124 6125 if (_cp != NULL) { 6126 MetadataFactory::free_metadata(_loader_data, _cp); 6127 } 6128 if (_fields != NULL) { 6129 MetadataFactory::free_array<u2>(_loader_data, _fields); 6130 } 6131 6132 if (_methods != NULL) { 6133 // Free methods 6134 InstanceKlass::deallocate_methods(_loader_data, _methods); 6135 } 6136 6137 // beware of the Universe::empty_blah_array!! 6138 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 6139 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 6140 } 6141 6142 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) { 6143 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 6144 } 6145 6146 if (_record_components != NULL) { 6147 InstanceKlass::deallocate_record_components(_loader_data, _record_components); 6148 } 6149 6150 // Free interfaces 6151 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 6152 _local_interfaces, _transitive_interfaces); 6153 6154 if (_combined_annotations != NULL) { 6155 // After all annotations arrays have been created, they are installed into the 6156 // Annotations object that will be assigned to the InstanceKlass being created. 6157 6158 // Deallocate the Annotations object and the installed annotations arrays. 6159 _combined_annotations->deallocate_contents(_loader_data); 6160 6161 // If the _combined_annotations pointer is non-NULL, 6162 // then the other annotations fields should have been cleared. 6163 assert(_class_annotations == NULL, "Should have been cleared"); 6164 assert(_class_type_annotations == NULL, "Should have been cleared"); 6165 assert(_fields_annotations == NULL, "Should have been cleared"); 6166 assert(_fields_type_annotations == NULL, "Should have been cleared"); 6167 } else { 6168 // If the annotations arrays were not installed into the Annotations object, 6169 // then they have to be deallocated explicitly. 6170 MetadataFactory::free_array<u1>(_loader_data, _class_annotations); 6171 MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations); 6172 Annotations::free_contents(_loader_data, _fields_annotations); 6173 Annotations::free_contents(_loader_data, _fields_type_annotations); 6174 } 6175 6176 clear_class_metadata(); 6177 _transitive_interfaces = NULL; 6178 6179 // deallocate the klass if already created. Don't directly deallocate, but add 6180 // to the deallocate list so that the klass is removed from the CLD::_klasses list 6181 // at a safepoint. 6182 if (_klass_to_deallocate != NULL) { 6183 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 6184 } 6185 } 6186 6187 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 6188 TRAPS) { 6189 6190 assert(stream != NULL, "invariant"); 6191 assert(_class_name != NULL, "invariant"); 6192 6193 // BEGIN STREAM PARSING 6194 stream->guarantee_more(8, CHECK); // magic, major, minor 6195 // Magic value 6196 const u4 magic = stream->get_u4_fast(); 6197 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 6198 "Incompatible magic value %u in class file %s", 6199 magic, CHECK); 6200 6201 // Version numbers 6202 _minor_version = stream->get_u2_fast(); 6203 _major_version = stream->get_u2_fast(); 6204 6205 if (DumpSharedSpaces && _major_version < JAVA_6_VERSION) { 6206 ResourceMark rm; 6207 warning("Pre JDK 6 class not supported by CDS: %u.%u %s", 6208 _major_version, _minor_version, _class_name->as_C_string()); 6209 Exceptions::fthrow( 6210 THREAD_AND_LOCATION, 6211 vmSymbols::java_lang_UnsupportedClassVersionError(), 6212 "Unsupported major.minor version for dump time %u.%u", 6213 _major_version, 6214 _minor_version); 6215 } 6216 6217 // Check version numbers - we check this even with verifier off 6218 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 6219 6220 stream->guarantee_more(3, CHECK); // length, first cp tag 6221 u2 cp_size = stream->get_u2_fast(); 6222 6223 guarantee_property( 6224 cp_size >= 1, "Illegal constant pool size %u in class file %s", 6225 cp_size, CHECK); 6226 6227 _orig_cp_size = cp_size; 6228 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 6229 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 6230 } 6231 cp_size += _max_num_patched_klasses; 6232 6233 _cp = ConstantPool::allocate(_loader_data, 6234 cp_size, 6235 CHECK); 6236 6237 ConstantPool* const cp = _cp; 6238 6239 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6240 6241 assert(cp_size == (const u2)cp->length(), "invariant"); 6242 6243 // ACCESS FLAGS 6244 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6245 6246 // Access flags 6247 jint flags; 6248 // JVM_ACC_MODULE is defined in JDK-9 and later. 6249 if (_major_version >= JAVA_9_VERSION) { 6250 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 6251 } else { 6252 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 6253 } 6254 6255 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6256 // Set abstract bit for old class files for backward compatibility 6257 flags |= JVM_ACC_ABSTRACT; 6258 } 6259 6260 verify_legal_class_modifiers(flags, CHECK); 6261 6262 short bad_constant = class_bad_constant_seen(); 6263 if (bad_constant != 0) { 6264 // Do not throw CFE until after the access_flags are checked because if 6265 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6266 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 6267 } 6268 6269 _access_flags.set_flags(flags); 6270 6271 // This class and superclass 6272 _this_class_index = stream->get_u2_fast(); 6273 check_property( 6274 valid_cp_range(_this_class_index, cp_size) && 6275 cp->tag_at(_this_class_index).is_unresolved_klass(), 6276 "Invalid this class index %u in constant pool in class file %s", 6277 _this_class_index, CHECK); 6278 6279 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6280 assert(class_name_in_cp != NULL, "class_name can't be null"); 6281 6282 // Update _class_name to reflect the name in the constant pool 6283 update_class_name(class_name_in_cp); 6284 6285 // Don't need to check whether this class name is legal or not. 6286 // It has been checked when constant pool is parsed. 6287 // However, make sure it is not an array type. 6288 if (_need_verify) { 6289 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY, 6290 "Bad class name in class file %s", 6291 CHECK); 6292 } 6293 6294 // Checks if name in class file matches requested name 6295 if (_requested_name != NULL && _requested_name != _class_name) { 6296 ResourceMark rm(THREAD); 6297 Exceptions::fthrow( 6298 THREAD_AND_LOCATION, 6299 vmSymbols::java_lang_NoClassDefFoundError(), 6300 "%s (wrong name: %s)", 6301 _class_name->as_C_string(), 6302 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 6303 ); 6304 return; 6305 } 6306 6307 // if this is an anonymous class fix up its name if it's in the unnamed 6308 // package. Otherwise, throw IAE if it is in a different package than 6309 // its host class. 6310 if (_unsafe_anonymous_host != NULL) { 6311 fix_unsafe_anonymous_class_name(CHECK); 6312 } 6313 6314 // Verification prevents us from creating names with dots in them, this 6315 // asserts that that's the case. 6316 assert(is_internal_format(_class_name), "external class name format used internally"); 6317 6318 if (!is_internal()) { 6319 LogTarget(Debug, class, preorder) lt; 6320 if (lt.is_enabled()){ 6321 ResourceMark rm(THREAD); 6322 LogStream ls(lt); 6323 ls.print("%s", _class_name->as_klass_external_name()); 6324 if (stream->source() != NULL) { 6325 ls.print(" source: %s", stream->source()); 6326 } 6327 ls.cr(); 6328 } 6329 6330 #if INCLUDE_CDS 6331 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6332 if (!ClassLoader::has_jrt_entry()) { 6333 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6334 DumpLoadedClassList = NULL; 6335 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6336 _unsafe_anonymous_host == NULL) { 6337 // Only dump the classes that can be stored into CDS archive. 6338 // Unsafe anonymous classes such as generated LambdaForm classes are also not included. 6339 oop class_loader = _loader_data->class_loader(); 6340 ResourceMark rm(THREAD); 6341 bool skip = false; 6342 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6343 // For the boot and platform class loaders, skip classes that are not found in the 6344 // java runtime image, such as those found in the --patch-module entries. 6345 // These classes can't be loaded from the archive during runtime. 6346 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) { 6347 skip = true; 6348 } 6349 6350 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6351 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6352 // as they can be loaded from the archive during runtime. 6353 skip = false; 6354 } 6355 } 6356 if (skip) { 6357 tty->print_cr("skip writing class %s from source %s to classlist file", 6358 _class_name->as_C_string(), stream->source()); 6359 } else { 6360 classlist_file->print_cr("%s", _class_name->as_C_string()); 6361 classlist_file->flush(); 6362 } 6363 } 6364 } 6365 #endif 6366 } 6367 6368 // SUPERKLASS 6369 _super_class_index = stream->get_u2_fast(); 6370 _super_klass = parse_super_class(cp, 6371 _super_class_index, 6372 _need_verify, 6373 CHECK); 6374 6375 // Interfaces 6376 _itfs_len = stream->get_u2_fast(); 6377 parse_interfaces(stream, 6378 _itfs_len, 6379 cp, 6380 &_has_nonstatic_concrete_methods, 6381 CHECK); 6382 6383 assert(_local_interfaces != NULL, "invariant"); 6384 6385 // Fields (offsets are filled in later) 6386 _fac = new FieldAllocationCount(); 6387 parse_fields(stream, 6388 _access_flags.is_interface(), 6389 _fac, 6390 cp, 6391 cp_size, 6392 &_java_fields_count, 6393 CHECK); 6394 6395 assert(_fields != NULL, "invariant"); 6396 6397 // Methods 6398 AccessFlags promoted_flags; 6399 parse_methods(stream, 6400 _access_flags.is_interface(), 6401 &promoted_flags, 6402 &_has_final_method, 6403 &_declares_nonstatic_concrete_methods, 6404 CHECK); 6405 6406 assert(_methods != NULL, "invariant"); 6407 6408 // promote flags from parse_methods() to the klass' flags 6409 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6410 6411 if (_declares_nonstatic_concrete_methods) { 6412 _has_nonstatic_concrete_methods = true; 6413 } 6414 6415 // Additional attributes/annotations 6416 _parsed_annotations = new ClassAnnotationCollector(); 6417 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6418 6419 assert(_inner_classes != NULL, "invariant"); 6420 6421 // Finalize the Annotations metadata object, 6422 // now that all annotation arrays have been created. 6423 create_combined_annotations(CHECK); 6424 6425 // Make sure this is the end of class file stream 6426 guarantee_property(stream->at_eos(), 6427 "Extra bytes at the end of class file %s", 6428 CHECK); 6429 6430 // all bytes in stream read and parsed 6431 } 6432 6433 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6434 ConstantPool* cp, 6435 TRAPS) { 6436 assert(stream != NULL, "invariant"); 6437 assert(stream->at_eos(), "invariant"); 6438 assert(cp != NULL, "invariant"); 6439 assert(_loader_data != NULL, "invariant"); 6440 6441 if (_class_name == vmSymbols::java_lang_Object()) { 6442 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6443 "java.lang.Object cannot implement an interface in class file %s", 6444 CHECK); 6445 } 6446 // We check super class after class file is parsed and format is checked 6447 if (_super_class_index > 0 && NULL ==_super_klass) { 6448 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6449 if (_access_flags.is_interface()) { 6450 // Before attempting to resolve the superclass, check for class format 6451 // errors not checked yet. 6452 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6453 "Interfaces must have java.lang.Object as superclass in class file %s", 6454 CHECK); 6455 } 6456 Handle loader(THREAD, _loader_data->class_loader()); 6457 _super_klass = (const InstanceKlass*) 6458 SystemDictionary::resolve_super_or_fail(_class_name, 6459 super_class_name, 6460 loader, 6461 _protection_domain, 6462 true, 6463 CHECK); 6464 } 6465 6466 if (_super_klass != NULL) { 6467 if (_super_klass->has_nonstatic_concrete_methods()) { 6468 _has_nonstatic_concrete_methods = true; 6469 } 6470 6471 if (_super_klass->is_interface()) { 6472 ResourceMark rm(THREAD); 6473 Exceptions::fthrow( 6474 THREAD_AND_LOCATION, 6475 vmSymbols::java_lang_IncompatibleClassChangeError(), 6476 "class %s has interface %s as super class", 6477 _class_name->as_klass_external_name(), 6478 _super_klass->external_name() 6479 ); 6480 return; 6481 } 6482 // Make sure super class is not final 6483 if (_super_klass->is_final()) { 6484 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6485 } 6486 } 6487 6488 // Compute the transitive list of all unique interfaces implemented by this class 6489 _transitive_interfaces = 6490 compute_transitive_interfaces(_super_klass, 6491 _local_interfaces, 6492 _loader_data, 6493 CHECK); 6494 6495 assert(_transitive_interfaces != NULL, "invariant"); 6496 6497 // sort methods 6498 _method_ordering = sort_methods(_methods); 6499 6500 _all_mirandas = new GrowableArray<Method*>(20); 6501 6502 Handle loader(THREAD, _loader_data->class_loader()); 6503 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6504 &_num_miranda_methods, 6505 _all_mirandas, 6506 _super_klass, 6507 _methods, 6508 _access_flags, 6509 _major_version, 6510 loader, 6511 _class_name, 6512 _local_interfaces, 6513 CHECK); 6514 6515 // Size of Java itable (in words) 6516 _itable_size = _access_flags.is_interface() ? 0 : 6517 klassItable::compute_itable_size(_transitive_interfaces); 6518 6519 assert(_fac != NULL, "invariant"); 6520 assert(_parsed_annotations != NULL, "invariant"); 6521 6522 _field_info = new FieldLayoutInfo(); 6523 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6524 6525 // Compute reference typ 6526 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6527 6528 } 6529 6530 void ClassFileParser::set_klass(InstanceKlass* klass) { 6531 6532 #ifdef ASSERT 6533 if (klass != NULL) { 6534 assert(NULL == _klass, "leaking?"); 6535 } 6536 #endif 6537 6538 _klass = klass; 6539 } 6540 6541 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6542 6543 #ifdef ASSERT 6544 if (klass != NULL) { 6545 assert(NULL == _klass_to_deallocate, "leaking?"); 6546 } 6547 #endif 6548 6549 _klass_to_deallocate = klass; 6550 } 6551 6552 // Caller responsible for ResourceMark 6553 // clone stream with rewound position 6554 const ClassFileStream* ClassFileParser::clone_stream() const { 6555 assert(_stream != NULL, "invariant"); 6556 6557 return _stream->clone(); 6558 } 6559 // ---------------------------------------------------------------------------- 6560 // debugging 6561 6562 #ifdef ASSERT 6563 6564 // return true if class_name contains no '.' (internal format is '/') 6565 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6566 if (class_name != NULL) { 6567 ResourceMark rm; 6568 char* name = class_name->as_C_string(); 6569 return strchr(name, JVM_SIGNATURE_DOT) == NULL; 6570 } else { 6571 return true; 6572 } 6573 } 6574 6575 #endif