1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 #include "precompiled.hpp" 25 #include "jvm.h" 26 #include "aot/aotLoader.hpp" 27 #include "classfile/classFileParser.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/defaultMethods.hpp" 32 #include "classfile/dictionary.hpp" 33 #include "classfile/javaClasses.inline.hpp" 34 #include "classfile/moduleEntry.hpp" 35 #include "classfile/symbolTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/verificationType.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/allocation.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/annotations.hpp" 48 #include "oops/constantPool.inline.hpp" 49 #include "oops/fieldStreams.hpp" 50 #include "oops/instanceKlass.hpp" 51 #include "oops/instanceMirrorKlass.hpp" 52 #include "oops/klass.inline.hpp" 53 #include "oops/klassVtable.hpp" 54 #include "oops/metadata.hpp" 55 #include "oops/method.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/symbol.hpp" 58 #include "prims/jvmtiExport.hpp" 59 #include "prims/jvmtiThreadState.hpp" 60 #include "runtime/arguments.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/perfData.hpp" 64 #include "runtime/reflection.hpp" 65 #include "runtime/safepointVerifiers.hpp" 66 #include "runtime/signature.hpp" 67 #include "runtime/timer.hpp" 68 #include "services/classLoadingService.hpp" 69 #include "services/threadService.hpp" 70 #include "utilities/align.hpp" 71 #include "utilities/bitMap.inline.hpp" 72 #include "utilities/copy.hpp" 73 #include "utilities/exceptions.hpp" 74 #include "utilities/globalDefinitions.hpp" 75 #include "utilities/growableArray.hpp" 76 #include "utilities/macros.hpp" 77 #include "utilities/ostream.hpp" 78 #include "utilities/resourceHash.hpp" 79 #if INCLUDE_CDS 80 #include "classfile/systemDictionaryShared.hpp" 81 #endif 82 #if INCLUDE_JFR 83 #include "jfr/support/jfrTraceIdExtension.hpp" 84 #endif 85 86 // We generally try to create the oops directly when parsing, rather than 87 // allocating temporary data structures and copying the bytes twice. A 88 // temporary area is only needed when parsing utf8 entries in the constant 89 // pool and when parsing line number tables. 90 91 // We add assert in debug mode when class format is not checked. 92 93 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 94 #define JAVA_MIN_SUPPORTED_VERSION 45 95 #define JAVA_PREVIEW_MINOR_VERSION 65535 96 97 // Used for two backward compatibility reasons: 98 // - to check for new additions to the class file format in JDK1.5 99 // - to check for bug fixes in the format checker in JDK1.5 100 #define JAVA_1_5_VERSION 49 101 102 // Used for backward compatibility reasons: 103 // - to check for javac bug fixes that happened after 1.5 104 // - also used as the max version when running in jdk6 105 #define JAVA_6_VERSION 50 106 107 // Used for backward compatibility reasons: 108 // - to disallow argument and require ACC_STATIC for <clinit> methods 109 #define JAVA_7_VERSION 51 110 111 // Extension method support. 112 #define JAVA_8_VERSION 52 113 114 #define JAVA_9_VERSION 53 115 116 #define JAVA_10_VERSION 54 117 118 #define JAVA_11_VERSION 55 119 120 #define JAVA_12_VERSION 56 121 122 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 123 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION, 124 "Unexpected bad constant pool entry"); 125 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 126 } 127 128 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 129 ConstantPool* cp, 130 const int length, 131 TRAPS) { 132 assert(stream != NULL, "invariant"); 133 assert(cp != NULL, "invariant"); 134 135 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 136 // this function (_current can be allocated in a register, with scalar 137 // replacement of aggregates). The _current pointer is copied back to 138 // stream() when this function returns. DON'T call another method within 139 // this method that uses stream(). 140 const ClassFileStream cfs1 = *stream; 141 const ClassFileStream* const cfs = &cfs1; 142 143 assert(cfs->allocated_on_stack(), "should be local"); 144 debug_only(const u1* const old_current = stream->current();) 145 146 // Used for batching symbol allocations. 147 const char* names[SymbolTable::symbol_alloc_batch_size]; 148 int lengths[SymbolTable::symbol_alloc_batch_size]; 149 int indices[SymbolTable::symbol_alloc_batch_size]; 150 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 151 int names_count = 0; 152 153 // parsing Index 0 is unused 154 for (int index = 1; index < length; index++) { 155 // Each of the following case guarantees one more byte in the stream 156 // for the following tag or the access_flags following constant pool, 157 // so we don't need bounds-check for reading tag. 158 const u1 tag = cfs->get_u1_fast(); 159 switch (tag) { 160 case JVM_CONSTANT_Class : { 161 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 162 const u2 name_index = cfs->get_u2_fast(); 163 cp->klass_index_at_put(index, name_index); 164 break; 165 } 166 case JVM_CONSTANT_Fieldref: { 167 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 168 const u2 class_index = cfs->get_u2_fast(); 169 const u2 name_and_type_index = cfs->get_u2_fast(); 170 cp->field_at_put(index, class_index, name_and_type_index); 171 break; 172 } 173 case JVM_CONSTANT_Methodref: { 174 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 175 const u2 class_index = cfs->get_u2_fast(); 176 const u2 name_and_type_index = cfs->get_u2_fast(); 177 cp->method_at_put(index, class_index, name_and_type_index); 178 break; 179 } 180 case JVM_CONSTANT_InterfaceMethodref: { 181 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 182 const u2 class_index = cfs->get_u2_fast(); 183 const u2 name_and_type_index = cfs->get_u2_fast(); 184 cp->interface_method_at_put(index, class_index, name_and_type_index); 185 break; 186 } 187 case JVM_CONSTANT_String : { 188 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 189 const u2 string_index = cfs->get_u2_fast(); 190 cp->string_index_at_put(index, string_index); 191 break; 192 } 193 case JVM_CONSTANT_MethodHandle : 194 case JVM_CONSTANT_MethodType: { 195 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 196 classfile_parse_error( 197 "Class file version does not support constant tag %u in class file %s", 198 tag, CHECK); 199 } 200 if (tag == JVM_CONSTANT_MethodHandle) { 201 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 202 const u1 ref_kind = cfs->get_u1_fast(); 203 const u2 method_index = cfs->get_u2_fast(); 204 cp->method_handle_index_at_put(index, ref_kind, method_index); 205 } 206 else if (tag == JVM_CONSTANT_MethodType) { 207 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 208 const u2 signature_index = cfs->get_u2_fast(); 209 cp->method_type_index_at_put(index, signature_index); 210 } 211 else { 212 ShouldNotReachHere(); 213 } 214 break; 215 } 216 case JVM_CONSTANT_Dynamic : { 217 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 218 classfile_parse_error( 219 "Class file version does not support constant tag %u in class file %s", 220 tag, CHECK); 221 } 222 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 223 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 224 const u2 name_and_type_index = cfs->get_u2_fast(); 225 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 226 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 227 } 228 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 229 break; 230 } 231 case JVM_CONSTANT_InvokeDynamic : { 232 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 233 classfile_parse_error( 234 "Class file version does not support constant tag %u in class file %s", 235 tag, CHECK); 236 } 237 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 238 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 239 const u2 name_and_type_index = cfs->get_u2_fast(); 240 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 241 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 242 } 243 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 244 break; 245 } 246 case JVM_CONSTANT_Integer: { 247 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 248 const u4 bytes = cfs->get_u4_fast(); 249 cp->int_at_put(index, (jint)bytes); 250 break; 251 } 252 case JVM_CONSTANT_Float: { 253 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 254 const u4 bytes = cfs->get_u4_fast(); 255 cp->float_at_put(index, *(jfloat*)&bytes); 256 break; 257 } 258 case JVM_CONSTANT_Long: { 259 // A mangled type might cause you to overrun allocated memory 260 guarantee_property(index + 1 < length, 261 "Invalid constant pool entry %u in class file %s", 262 index, 263 CHECK); 264 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 265 const u8 bytes = cfs->get_u8_fast(); 266 cp->long_at_put(index, bytes); 267 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 268 break; 269 } 270 case JVM_CONSTANT_Double: { 271 // A mangled type might cause you to overrun allocated memory 272 guarantee_property(index+1 < length, 273 "Invalid constant pool entry %u in class file %s", 274 index, 275 CHECK); 276 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 277 const u8 bytes = cfs->get_u8_fast(); 278 cp->double_at_put(index, *(jdouble*)&bytes); 279 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 280 break; 281 } 282 case JVM_CONSTANT_NameAndType: { 283 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 284 const u2 name_index = cfs->get_u2_fast(); 285 const u2 signature_index = cfs->get_u2_fast(); 286 cp->name_and_type_at_put(index, name_index, signature_index); 287 break; 288 } 289 case JVM_CONSTANT_Utf8 : { 290 cfs->guarantee_more(2, CHECK); // utf8_length 291 u2 utf8_length = cfs->get_u2_fast(); 292 const u1* utf8_buffer = cfs->current(); 293 assert(utf8_buffer != NULL, "null utf8 buffer"); 294 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 295 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 296 cfs->skip_u1_fast(utf8_length); 297 298 // Before storing the symbol, make sure it's legal 299 if (_need_verify) { 300 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 301 } 302 303 if (has_cp_patch_at(index)) { 304 Handle patch = clear_cp_patch_at(index); 305 guarantee_property(java_lang_String::is_instance(patch()), 306 "Illegal utf8 patch at %d in class file %s", 307 index, 308 CHECK); 309 const char* const str = java_lang_String::as_utf8_string(patch()); 310 // (could use java_lang_String::as_symbol instead, but might as well batch them) 311 utf8_buffer = (const u1*) str; 312 utf8_length = (int) strlen(str); 313 } 314 315 unsigned int hash; 316 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 317 utf8_length, 318 hash); 319 if (result == NULL) { 320 names[names_count] = (const char*)utf8_buffer; 321 lengths[names_count] = utf8_length; 322 indices[names_count] = index; 323 hashValues[names_count++] = hash; 324 if (names_count == SymbolTable::symbol_alloc_batch_size) { 325 SymbolTable::new_symbols(_loader_data, 326 cp, 327 names_count, 328 names, 329 lengths, 330 indices, 331 hashValues, 332 CHECK); 333 names_count = 0; 334 } 335 } else { 336 cp->symbol_at_put(index, result); 337 } 338 break; 339 } 340 case 19: 341 case 20: { 342 // Record that an error occurred in these two cases but keep parsing so 343 // that ACC_Module can be checked for in the access_flags. Need to 344 // throw NoClassDefFoundError in that case. 345 if (_major_version >= JAVA_9_VERSION) { 346 cfs->guarantee_more(3, CHECK); 347 cfs->get_u2_fast(); 348 set_class_bad_constant_seen(tag); 349 break; 350 } 351 } 352 default: { 353 classfile_parse_error("Unknown constant tag %u in class file %s", 354 tag, 355 CHECK); 356 break; 357 } 358 } // end of switch(tag) 359 } // end of for 360 361 // Allocate the remaining symbols 362 if (names_count > 0) { 363 SymbolTable::new_symbols(_loader_data, 364 cp, 365 names_count, 366 names, 367 lengths, 368 indices, 369 hashValues, 370 CHECK); 371 } 372 373 // Copy _current pointer of local copy back to stream. 374 assert(stream->current() == old_current, "non-exclusive use of stream"); 375 stream->set_current(cfs1.current()); 376 377 } 378 379 static inline bool valid_cp_range(int index, int length) { 380 return (index > 0 && index < length); 381 } 382 383 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 384 assert(cp != NULL, "invariant"); 385 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 386 return cp->symbol_at(index); 387 } 388 return NULL; 389 } 390 391 #ifdef ASSERT 392 PRAGMA_DIAG_PUSH 393 PRAGMA_FORMAT_NONLITERAL_IGNORED 394 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 395 ResourceMark rm(THREAD); 396 fatal(msg, _class_name->as_C_string()); 397 } 398 399 void ClassFileParser::report_assert_property_failure(const char* msg, 400 int index, 401 TRAPS) const { 402 ResourceMark rm(THREAD); 403 fatal(msg, index, _class_name->as_C_string()); 404 } 405 PRAGMA_DIAG_POP 406 #endif 407 408 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 409 ConstantPool* const cp, 410 const int length, 411 TRAPS) { 412 assert(cp != NULL, "invariant"); 413 assert(stream != NULL, "invariant"); 414 415 // parsing constant pool entries 416 parse_constant_pool_entries(stream, cp, length, CHECK); 417 if (class_bad_constant_seen() != 0) { 418 // a bad CP entry has been detected previously so stop parsing and just return. 419 return; 420 } 421 422 int index = 1; // declared outside of loops for portability 423 int num_klasses = 0; 424 425 // first verification pass - validate cross references 426 // and fixup class and string constants 427 for (index = 1; index < length; index++) { // Index 0 is unused 428 const jbyte tag = cp->tag_at(index).value(); 429 switch (tag) { 430 case JVM_CONSTANT_Class: { 431 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 432 break; 433 } 434 case JVM_CONSTANT_Fieldref: 435 // fall through 436 case JVM_CONSTANT_Methodref: 437 // fall through 438 case JVM_CONSTANT_InterfaceMethodref: { 439 if (!_need_verify) break; 440 const int klass_ref_index = cp->klass_ref_index_at(index); 441 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 442 check_property(valid_klass_reference_at(klass_ref_index), 443 "Invalid constant pool index %u in class file %s", 444 klass_ref_index, CHECK); 445 check_property(valid_cp_range(name_and_type_ref_index, length) && 446 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 447 "Invalid constant pool index %u in class file %s", 448 name_and_type_ref_index, CHECK); 449 break; 450 } 451 case JVM_CONSTANT_String: { 452 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 453 break; 454 } 455 case JVM_CONSTANT_Integer: 456 break; 457 case JVM_CONSTANT_Float: 458 break; 459 case JVM_CONSTANT_Long: 460 case JVM_CONSTANT_Double: { 461 index++; 462 check_property( 463 (index < length && cp->tag_at(index).is_invalid()), 464 "Improper constant pool long/double index %u in class file %s", 465 index, CHECK); 466 break; 467 } 468 case JVM_CONSTANT_NameAndType: { 469 if (!_need_verify) break; 470 const int name_ref_index = cp->name_ref_index_at(index); 471 const int signature_ref_index = cp->signature_ref_index_at(index); 472 check_property(valid_symbol_at(name_ref_index), 473 "Invalid constant pool index %u in class file %s", 474 name_ref_index, CHECK); 475 check_property(valid_symbol_at(signature_ref_index), 476 "Invalid constant pool index %u in class file %s", 477 signature_ref_index, CHECK); 478 break; 479 } 480 case JVM_CONSTANT_Utf8: 481 break; 482 case JVM_CONSTANT_UnresolvedClass: // fall-through 483 case JVM_CONSTANT_UnresolvedClassInError: { 484 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 485 break; 486 } 487 case JVM_CONSTANT_ClassIndex: { 488 const int class_index = cp->klass_index_at(index); 489 check_property(valid_symbol_at(class_index), 490 "Invalid constant pool index %u in class file %s", 491 class_index, CHECK); 492 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 493 break; 494 } 495 case JVM_CONSTANT_StringIndex: { 496 const int string_index = cp->string_index_at(index); 497 check_property(valid_symbol_at(string_index), 498 "Invalid constant pool index %u in class file %s", 499 string_index, CHECK); 500 Symbol* const sym = cp->symbol_at(string_index); 501 cp->unresolved_string_at_put(index, sym); 502 break; 503 } 504 case JVM_CONSTANT_MethodHandle: { 505 const int ref_index = cp->method_handle_index_at(index); 506 check_property(valid_cp_range(ref_index, length), 507 "Invalid constant pool index %u in class file %s", 508 ref_index, CHECK); 509 const constantTag tag = cp->tag_at(ref_index); 510 const int ref_kind = cp->method_handle_ref_kind_at(index); 511 512 switch (ref_kind) { 513 case JVM_REF_getField: 514 case JVM_REF_getStatic: 515 case JVM_REF_putField: 516 case JVM_REF_putStatic: { 517 check_property( 518 tag.is_field(), 519 "Invalid constant pool index %u in class file %s (not a field)", 520 ref_index, CHECK); 521 break; 522 } 523 case JVM_REF_invokeVirtual: 524 case JVM_REF_newInvokeSpecial: { 525 check_property( 526 tag.is_method(), 527 "Invalid constant pool index %u in class file %s (not a method)", 528 ref_index, CHECK); 529 break; 530 } 531 case JVM_REF_invokeStatic: 532 case JVM_REF_invokeSpecial: { 533 check_property( 534 tag.is_method() || 535 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 536 "Invalid constant pool index %u in class file %s (not a method)", 537 ref_index, CHECK); 538 break; 539 } 540 case JVM_REF_invokeInterface: { 541 check_property( 542 tag.is_interface_method(), 543 "Invalid constant pool index %u in class file %s (not an interface method)", 544 ref_index, CHECK); 545 break; 546 } 547 default: { 548 classfile_parse_error( 549 "Bad method handle kind at constant pool index %u in class file %s", 550 index, CHECK); 551 } 552 } // switch(refkind) 553 // Keep the ref_index unchanged. It will be indirected at link-time. 554 break; 555 } // case MethodHandle 556 case JVM_CONSTANT_MethodType: { 557 const int ref_index = cp->method_type_index_at(index); 558 check_property(valid_symbol_at(ref_index), 559 "Invalid constant pool index %u in class file %s", 560 ref_index, CHECK); 561 break; 562 } 563 case JVM_CONSTANT_Dynamic: { 564 const int name_and_type_ref_index = 565 cp->invoke_dynamic_name_and_type_ref_index_at(index); 566 567 check_property(valid_cp_range(name_and_type_ref_index, length) && 568 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 569 "Invalid constant pool index %u in class file %s", 570 name_and_type_ref_index, CHECK); 571 // bootstrap specifier index must be checked later, 572 // when BootstrapMethods attr is available 573 574 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 575 cp->set_has_dynamic_constant(); 576 break; 577 } 578 case JVM_CONSTANT_InvokeDynamic: { 579 const int name_and_type_ref_index = 580 cp->invoke_dynamic_name_and_type_ref_index_at(index); 581 582 check_property(valid_cp_range(name_and_type_ref_index, length) && 583 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 584 "Invalid constant pool index %u in class file %s", 585 name_and_type_ref_index, CHECK); 586 // bootstrap specifier index must be checked later, 587 // when BootstrapMethods attr is available 588 break; 589 } 590 default: { 591 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 592 ShouldNotReachHere(); 593 break; 594 } 595 } // switch(tag) 596 } // end of for 597 598 _first_patched_klass_resolved_index = num_klasses; 599 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 600 601 if (_cp_patches != NULL) { 602 // need to treat this_class specially... 603 604 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 605 // for now. These will be replaced with actual names of the patched classes in patch_class(). 606 Symbol* s = vmSymbols::star_name(); 607 for (int n=_orig_cp_size; n<cp->length(); n++) { 608 cp->symbol_at_put(n, s); 609 } 610 611 int this_class_index; 612 { 613 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 614 const u1* const mark = stream->current(); 615 stream->skip_u2_fast(1); // skip flags 616 this_class_index = stream->get_u2_fast(); 617 stream->set_current(mark); // revert to mark 618 } 619 620 for (index = 1; index < length; index++) { // Index 0 is unused 621 if (has_cp_patch_at(index)) { 622 guarantee_property(index != this_class_index, 623 "Illegal constant pool patch to self at %d in class file %s", 624 index, CHECK); 625 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 626 } 627 } 628 } 629 630 if (!_need_verify) { 631 return; 632 } 633 634 // second verification pass - checks the strings are of the right format. 635 // but not yet to the other entries 636 for (index = 1; index < length; index++) { 637 const jbyte tag = cp->tag_at(index).value(); 638 switch (tag) { 639 case JVM_CONSTANT_UnresolvedClass: { 640 const Symbol* const class_name = cp->klass_name_at(index); 641 // check the name, even if _cp_patches will overwrite it 642 verify_legal_class_name(class_name, CHECK); 643 break; 644 } 645 case JVM_CONSTANT_NameAndType: { 646 if (_need_verify) { 647 const int sig_index = cp->signature_ref_index_at(index); 648 const int name_index = cp->name_ref_index_at(index); 649 const Symbol* const name = cp->symbol_at(name_index); 650 const Symbol* const sig = cp->symbol_at(sig_index); 651 guarantee_property(sig->utf8_length() != 0, 652 "Illegal zero length constant pool entry at %d in class %s", 653 sig_index, CHECK); 654 guarantee_property(name->utf8_length() != 0, 655 "Illegal zero length constant pool entry at %d in class %s", 656 name_index, CHECK); 657 658 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) { 659 // Format check method name and signature 660 verify_legal_method_name(name, CHECK); 661 verify_legal_method_signature(name, sig, CHECK); 662 } else { 663 // Format check field name and signature 664 verify_legal_field_name(name, CHECK); 665 verify_legal_field_signature(name, sig, CHECK); 666 } 667 } 668 break; 669 } 670 case JVM_CONSTANT_Dynamic: { 671 const int name_and_type_ref_index = 672 cp->name_and_type_ref_index_at(index); 673 // already verified to be utf8 674 const int name_ref_index = 675 cp->name_ref_index_at(name_and_type_ref_index); 676 // already verified to be utf8 677 const int signature_ref_index = 678 cp->signature_ref_index_at(name_and_type_ref_index); 679 const Symbol* const name = cp->symbol_at(name_ref_index); 680 const Symbol* const signature = cp->symbol_at(signature_ref_index); 681 if (_need_verify) { 682 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 683 // Need only to be sure signature is non-zero length and the right type. 684 if (signature->utf8_length() == 0 || 685 signature->char_at(0) == JVM_SIGNATURE_FUNC) { 686 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 687 } 688 } 689 break; 690 } 691 case JVM_CONSTANT_InvokeDynamic: 692 case JVM_CONSTANT_Fieldref: 693 case JVM_CONSTANT_Methodref: 694 case JVM_CONSTANT_InterfaceMethodref: { 695 const int name_and_type_ref_index = 696 cp->name_and_type_ref_index_at(index); 697 // already verified to be utf8 698 const int name_ref_index = 699 cp->name_ref_index_at(name_and_type_ref_index); 700 // already verified to be utf8 701 const int signature_ref_index = 702 cp->signature_ref_index_at(name_and_type_ref_index); 703 const Symbol* const name = cp->symbol_at(name_ref_index); 704 const Symbol* const signature = cp->symbol_at(signature_ref_index); 705 if (tag == JVM_CONSTANT_Fieldref) { 706 if (_need_verify) { 707 // Field name and signature are verified above, when iterating NameAndType_info. 708 // Need only to be sure signature is non-zero length and the right type. 709 if (signature->utf8_length() == 0 || 710 signature->char_at(0) == JVM_SIGNATURE_FUNC) { 711 throwIllegalSignature("Field", name, signature, CHECK); 712 } 713 } 714 } else { 715 if (_need_verify) { 716 // Method name and signature are verified above, when iterating NameAndType_info. 717 // Need only to be sure signature is non-zero length and the right type. 718 if (signature->utf8_length() == 0 || 719 signature->char_at(0) != JVM_SIGNATURE_FUNC) { 720 throwIllegalSignature("Method", name, signature, CHECK); 721 } 722 } 723 // 4509014: If a class method name begins with '<', it must be "<init>" 724 const unsigned int name_len = name->utf8_length(); 725 if (tag == JVM_CONSTANT_Methodref && 726 name_len != 0 && 727 name->char_at(0) == '<' && 728 name != vmSymbols::object_initializer_name()) { 729 classfile_parse_error( 730 "Bad method name at constant pool index %u in class file %s", 731 name_ref_index, CHECK); 732 } 733 } 734 break; 735 } 736 case JVM_CONSTANT_MethodHandle: { 737 const int ref_index = cp->method_handle_index_at(index); 738 const int ref_kind = cp->method_handle_ref_kind_at(index); 739 switch (ref_kind) { 740 case JVM_REF_invokeVirtual: 741 case JVM_REF_invokeStatic: 742 case JVM_REF_invokeSpecial: 743 case JVM_REF_newInvokeSpecial: { 744 const int name_and_type_ref_index = 745 cp->name_and_type_ref_index_at(ref_index); 746 const int name_ref_index = 747 cp->name_ref_index_at(name_and_type_ref_index); 748 const Symbol* const name = cp->symbol_at(name_ref_index); 749 if (ref_kind == JVM_REF_newInvokeSpecial) { 750 if (name != vmSymbols::object_initializer_name()) { 751 classfile_parse_error( 752 "Bad constructor name at constant pool index %u in class file %s", 753 name_ref_index, CHECK); 754 } 755 } else { 756 if (name == vmSymbols::object_initializer_name()) { 757 classfile_parse_error( 758 "Bad method name at constant pool index %u in class file %s", 759 name_ref_index, CHECK); 760 } 761 } 762 break; 763 } 764 // Other ref_kinds are already fully checked in previous pass. 765 } // switch(ref_kind) 766 break; 767 } 768 case JVM_CONSTANT_MethodType: { 769 const Symbol* const no_name = vmSymbols::type_name(); // place holder 770 const Symbol* const signature = cp->method_type_signature_at(index); 771 verify_legal_method_signature(no_name, signature, CHECK); 772 break; 773 } 774 case JVM_CONSTANT_Utf8: { 775 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 776 } 777 } // switch(tag) 778 } // end of for 779 } 780 781 Handle ClassFileParser::clear_cp_patch_at(int index) { 782 Handle patch = cp_patch_at(index); 783 _cp_patches->at_put(index, Handle()); 784 assert(!has_cp_patch_at(index), ""); 785 return patch; 786 } 787 788 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) { 789 int name_index = _orig_cp_size + _num_patched_klasses; 790 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses; 791 792 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name); 793 _num_patched_klasses ++; 794 } 795 796 void ClassFileParser::patch_constant_pool(ConstantPool* cp, 797 int index, 798 Handle patch, 799 TRAPS) { 800 assert(cp != NULL, "invariant"); 801 802 BasicType patch_type = T_VOID; 803 804 switch (cp->tag_at(index).value()) { 805 806 case JVM_CONSTANT_UnresolvedClass: { 807 // Patching a class means pre-resolving it. 808 // The name in the constant pool is ignored. 809 if (java_lang_Class::is_instance(patch())) { 810 guarantee_property(!java_lang_Class::is_primitive(patch()), 811 "Illegal class patch at %d in class file %s", 812 index, CHECK); 813 Klass* k = java_lang_Class::as_Klass(patch()); 814 patch_class(cp, index, k, k->name()); 815 } else { 816 guarantee_property(java_lang_String::is_instance(patch()), 817 "Illegal class patch at %d in class file %s", 818 index, CHECK); 819 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK); 820 patch_class(cp, index, NULL, name); 821 } 822 break; 823 } 824 825 case JVM_CONSTANT_String: { 826 // skip this patch and don't clear it. Needs the oop array for resolved 827 // references to be created first. 828 return; 829 } 830 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 831 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 832 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 833 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 834 patch_prim: 835 { 836 jvalue value; 837 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 838 guarantee_property(value_type == patch_type, 839 "Illegal primitive patch at %d in class file %s", 840 index, CHECK); 841 switch (value_type) { 842 case T_INT: cp->int_at_put(index, value.i); break; 843 case T_FLOAT: cp->float_at_put(index, value.f); break; 844 case T_LONG: cp->long_at_put(index, value.j); break; 845 case T_DOUBLE: cp->double_at_put(index, value.d); break; 846 default: assert(false, ""); 847 } 848 } // end patch_prim label 849 break; 850 851 default: { 852 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 853 guarantee_property(!has_cp_patch_at(index), 854 "Illegal unexpected patch at %d in class file %s", 855 index, CHECK); 856 return; 857 } 858 } // end of switch(tag) 859 860 // On fall-through, mark the patch as used. 861 clear_cp_patch_at(index); 862 } 863 class NameSigHash: public ResourceObj { 864 public: 865 const Symbol* _name; // name 866 const Symbol* _sig; // signature 867 NameSigHash* _next; // Next entry in hash table 868 }; 869 870 static const int HASH_ROW_SIZE = 256; 871 872 static unsigned int hash(const Symbol* name, const Symbol* sig) { 873 unsigned int raw_hash = 0; 874 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 875 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 876 877 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 878 } 879 880 881 static void initialize_hashtable(NameSigHash** table) { 882 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 883 } 884 // Return false if the name/sig combination is found in table. 885 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 886 // The old format checker uses heap sort to find duplicates. 887 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 888 // of table since we don't expect Symbol*'s to move. 889 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 890 assert(name != NULL, "name in constant pool is NULL"); 891 892 // First lookup for duplicates 893 int index = hash(name, sig); 894 NameSigHash* entry = table[index]; 895 while (entry != NULL) { 896 if (entry->_name == name && entry->_sig == sig) { 897 return false; 898 } 899 entry = entry->_next; 900 } 901 902 // No duplicate is found, allocate a new entry and fill it. 903 entry = new NameSigHash(); 904 entry->_name = name; 905 entry->_sig = sig; 906 907 // Insert into hash table 908 entry->_next = table[index]; 909 table[index] = entry; 910 911 return true; 912 } 913 914 // Side-effects: populates the _local_interfaces field 915 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 916 const int itfs_len, 917 ConstantPool* const cp, 918 bool* const has_nonstatic_concrete_methods, 919 TRAPS) { 920 assert(stream != NULL, "invariant"); 921 assert(cp != NULL, "invariant"); 922 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 923 924 if (itfs_len == 0) { 925 _local_interfaces = Universe::the_empty_instance_klass_array(); 926 } else { 927 assert(itfs_len > 0, "only called for len>0"); 928 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK); 929 930 int index; 931 for (index = 0; index < itfs_len; index++) { 932 const u2 interface_index = stream->get_u2(CHECK); 933 Klass* interf; 934 check_property( 935 valid_klass_reference_at(interface_index), 936 "Interface name has bad constant pool index %u in class file %s", 937 interface_index, CHECK); 938 if (cp->tag_at(interface_index).is_klass()) { 939 interf = cp->resolved_klass_at(interface_index); 940 } else { 941 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 942 943 // Don't need to check legal name because it's checked when parsing constant pool. 944 // But need to make sure it's not an array type. 945 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, 946 "Bad interface name in class file %s", CHECK); 947 948 // Call resolve_super so classcircularity is checked 949 interf = SystemDictionary::resolve_super_or_fail( 950 _class_name, 951 unresolved_klass, 952 Handle(THREAD, _loader_data->class_loader()), 953 _protection_domain, 954 false, 955 CHECK); 956 } 957 958 if (!interf->is_interface()) { 959 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 960 err_msg("class %s can not implement %s, because it is not an interface (%s)", 961 _class_name->as_klass_external_name(), 962 interf->external_name(), 963 interf->class_in_module_of_loader())); 964 } 965 966 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 967 *has_nonstatic_concrete_methods = true; 968 } 969 _local_interfaces->at_put(index, InstanceKlass::cast(interf)); 970 } 971 972 if (!_need_verify || itfs_len <= 1) { 973 return; 974 } 975 976 // Check if there's any duplicates in interfaces 977 ResourceMark rm(THREAD); 978 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 979 NameSigHash*, 980 HASH_ROW_SIZE); 981 initialize_hashtable(interface_names); 982 bool dup = false; 983 const Symbol* name = NULL; 984 { 985 debug_only(NoSafepointVerifier nsv;) 986 for (index = 0; index < itfs_len; index++) { 987 const InstanceKlass* const k = _local_interfaces->at(index); 988 name = k->name(); 989 // If no duplicates, add (name, NULL) in hashtable interface_names. 990 if (!put_after_lookup(name, NULL, interface_names)) { 991 dup = true; 992 break; 993 } 994 } 995 } 996 if (dup) { 997 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 998 name->as_C_string(), CHECK); 999 } 1000 } 1001 } 1002 1003 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1004 int constantvalue_index, 1005 int signature_index, 1006 TRAPS) const { 1007 // Make sure the constant pool entry is of a type appropriate to this field 1008 guarantee_property( 1009 (constantvalue_index > 0 && 1010 constantvalue_index < cp->length()), 1011 "Bad initial value index %u in ConstantValue attribute in class file %s", 1012 constantvalue_index, CHECK); 1013 1014 const constantTag value_type = cp->tag_at(constantvalue_index); 1015 switch(cp->basic_type_for_signature_at(signature_index)) { 1016 case T_LONG: { 1017 guarantee_property(value_type.is_long(), 1018 "Inconsistent constant value type in class file %s", 1019 CHECK); 1020 break; 1021 } 1022 case T_FLOAT: { 1023 guarantee_property(value_type.is_float(), 1024 "Inconsistent constant value type in class file %s", 1025 CHECK); 1026 break; 1027 } 1028 case T_DOUBLE: { 1029 guarantee_property(value_type.is_double(), 1030 "Inconsistent constant value type in class file %s", 1031 CHECK); 1032 break; 1033 } 1034 case T_BYTE: 1035 case T_CHAR: 1036 case T_SHORT: 1037 case T_BOOLEAN: 1038 case T_INT: { 1039 guarantee_property(value_type.is_int(), 1040 "Inconsistent constant value type in class file %s", 1041 CHECK); 1042 break; 1043 } 1044 case T_OBJECT: { 1045 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1046 && value_type.is_string()), 1047 "Bad string initial value in class file %s", 1048 CHECK); 1049 break; 1050 } 1051 default: { 1052 classfile_parse_error("Unable to set initial value %u in class file %s", 1053 constantvalue_index, 1054 CHECK); 1055 } 1056 } 1057 } 1058 1059 class AnnotationCollector : public ResourceObj{ 1060 public: 1061 enum Location { _in_field, _in_method, _in_class }; 1062 enum ID { 1063 _unknown = 0, 1064 _method_CallerSensitive, 1065 _method_ForceInline, 1066 _method_DontInline, 1067 _method_InjectedProfile, 1068 _method_LambdaForm_Compiled, 1069 _method_Hidden, 1070 _method_HotSpotIntrinsicCandidate, 1071 _jdk_internal_vm_annotation_Contended, 1072 _field_Stable, 1073 _jdk_internal_vm_annotation_ReservedStackAccess, 1074 _annotation_LIMIT 1075 }; 1076 const Location _location; 1077 int _annotations_present; 1078 u2 _contended_group; 1079 1080 AnnotationCollector(Location location) 1081 : _location(location), _annotations_present(0) 1082 { 1083 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1084 } 1085 // If this annotation name has an ID, report it (or _none). 1086 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 1087 // Set the annotation name: 1088 void set_annotation(ID id) { 1089 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1090 _annotations_present |= nth_bit((int)id); 1091 } 1092 1093 void remove_annotation(ID id) { 1094 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1095 _annotations_present &= ~nth_bit((int)id); 1096 } 1097 1098 // Report if the annotation is present. 1099 bool has_any_annotations() const { return _annotations_present != 0; } 1100 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1101 1102 void set_contended_group(u2 group) { _contended_group = group; } 1103 u2 contended_group() const { return _contended_group; } 1104 1105 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1106 1107 void set_stable(bool stable) { set_annotation(_field_Stable); } 1108 bool is_stable() const { return has_annotation(_field_Stable); } 1109 }; 1110 1111 // This class also doubles as a holder for metadata cleanup. 1112 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1113 private: 1114 ClassLoaderData* _loader_data; 1115 AnnotationArray* _field_annotations; 1116 AnnotationArray* _field_type_annotations; 1117 public: 1118 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1119 AnnotationCollector(_in_field), 1120 _loader_data(loader_data), 1121 _field_annotations(NULL), 1122 _field_type_annotations(NULL) {} 1123 ~FieldAnnotationCollector(); 1124 void apply_to(FieldInfo* f); 1125 AnnotationArray* field_annotations() { return _field_annotations; } 1126 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1127 1128 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1129 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1130 }; 1131 1132 class MethodAnnotationCollector : public AnnotationCollector{ 1133 public: 1134 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1135 void apply_to(const methodHandle& m); 1136 }; 1137 1138 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1139 public: 1140 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1141 void apply_to(InstanceKlass* ik); 1142 }; 1143 1144 1145 static int skip_annotation_value(const u1*, int, int); // fwd decl 1146 1147 // Safely increment index by val if does not pass limit 1148 #define SAFE_ADD(index, limit, val) \ 1149 if (index >= limit - val) return limit; \ 1150 index += val; 1151 1152 // Skip an annotation. Return >=limit if there is any problem. 1153 static int skip_annotation(const u1* buffer, int limit, int index) { 1154 assert(buffer != NULL, "invariant"); 1155 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1156 // value := switch (tag:u1) { ... } 1157 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1158 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1159 while (--nmem >= 0 && index < limit) { 1160 SAFE_ADD(index, limit, 2); // skip member 1161 index = skip_annotation_value(buffer, limit, index); 1162 } 1163 return index; 1164 } 1165 1166 // Skip an annotation value. Return >=limit if there is any problem. 1167 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1168 assert(buffer != NULL, "invariant"); 1169 1170 // value := switch (tag:u1) { 1171 // case B, C, I, S, Z, D, F, J, c: con:u2; 1172 // case e: e_class:u2 e_name:u2; 1173 // case s: s_con:u2; 1174 // case [: do(nval:u2) {value}; 1175 // case @: annotation; 1176 // case s: s_con:u2; 1177 // } 1178 SAFE_ADD(index, limit, 1); // read tag 1179 const u1 tag = buffer[index - 1]; 1180 switch (tag) { 1181 case 'B': 1182 case 'C': 1183 case 'I': 1184 case 'S': 1185 case 'Z': 1186 case 'D': 1187 case 'F': 1188 case 'J': 1189 case 'c': 1190 case 's': 1191 SAFE_ADD(index, limit, 2); // skip con or s_con 1192 break; 1193 case 'e': 1194 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1195 break; 1196 case '[': 1197 { 1198 SAFE_ADD(index, limit, 2); // read nval 1199 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1200 while (--nval >= 0 && index < limit) { 1201 index = skip_annotation_value(buffer, limit, index); 1202 } 1203 } 1204 break; 1205 case '@': 1206 index = skip_annotation(buffer, limit, index); 1207 break; 1208 default: 1209 return limit; // bad tag byte 1210 } 1211 return index; 1212 } 1213 1214 // Sift through annotations, looking for those significant to the VM: 1215 static void parse_annotations(const ConstantPool* const cp, 1216 const u1* buffer, int limit, 1217 AnnotationCollector* coll, 1218 ClassLoaderData* loader_data, 1219 TRAPS) { 1220 1221 assert(cp != NULL, "invariant"); 1222 assert(buffer != NULL, "invariant"); 1223 assert(coll != NULL, "invariant"); 1224 assert(loader_data != NULL, "invariant"); 1225 1226 // annotations := do(nann:u2) {annotation} 1227 int index = 2; // read nann 1228 if (index >= limit) return; 1229 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1230 enum { // initial annotation layout 1231 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1232 count_off = 2, // u2 such as 1 (one value) 1233 member_off = 4, // utf8 such as 'value' 1234 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1235 e_tag_val = 'e', 1236 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1237 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1238 e_size = 11, // end of 'e' annotation 1239 c_tag_val = 'c', // payload is type 1240 c_con_off = 7, // utf8 payload, such as 'I' 1241 c_size = 9, // end of 'c' annotation 1242 s_tag_val = 's', // payload is String 1243 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1244 s_size = 9, 1245 min_size = 6 // smallest possible size (zero members) 1246 }; 1247 // Cannot add min_size to index in case of overflow MAX_INT 1248 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1249 int index0 = index; 1250 index = skip_annotation(buffer, limit, index); 1251 const u1* const abase = buffer + index0; 1252 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1253 const int count = Bytes::get_Java_u2((address)abase + count_off); 1254 const Symbol* const aname = check_symbol_at(cp, atype); 1255 if (aname == NULL) break; // invalid annotation name 1256 const Symbol* member = NULL; 1257 if (count >= 1) { 1258 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1259 member = check_symbol_at(cp, member_index); 1260 if (member == NULL) break; // invalid member name 1261 } 1262 1263 // Here is where parsing particular annotations will take place. 1264 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1265 if (AnnotationCollector::_unknown == id) continue; 1266 coll->set_annotation(id); 1267 1268 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1269 // @Contended can optionally specify the contention group. 1270 // 1271 // Contended group defines the equivalence class over the fields: 1272 // the fields within the same contended group are not treated distinct. 1273 // The only exception is default group, which does not incur the 1274 // equivalence. Naturally, contention group for classes is meaningless. 1275 // 1276 // While the contention group is specified as String, annotation 1277 // values are already interned, and we might as well use the constant 1278 // pool index as the group tag. 1279 // 1280 u2 group_index = 0; // default contended group 1281 if (count == 1 1282 && s_size == (index - index0) // match size 1283 && s_tag_val == *(abase + tag_off) 1284 && member == vmSymbols::value_name()) { 1285 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1286 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1287 group_index = 0; // default contended group 1288 } 1289 } 1290 coll->set_contended_group(group_index); 1291 } 1292 } 1293 } 1294 1295 1296 // Parse attributes for a field. 1297 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1298 u2 attributes_count, 1299 bool is_static, u2 signature_index, 1300 u2* const constantvalue_index_addr, 1301 bool* const is_synthetic_addr, 1302 u2* const generic_signature_index_addr, 1303 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1304 TRAPS) { 1305 assert(cfs != NULL, "invariant"); 1306 assert(constantvalue_index_addr != NULL, "invariant"); 1307 assert(is_synthetic_addr != NULL, "invariant"); 1308 assert(generic_signature_index_addr != NULL, "invariant"); 1309 assert(parsed_annotations != NULL, "invariant"); 1310 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1311 1312 u2 constantvalue_index = 0; 1313 u2 generic_signature_index = 0; 1314 bool is_synthetic = false; 1315 const u1* runtime_visible_annotations = NULL; 1316 int runtime_visible_annotations_length = 0; 1317 const u1* runtime_invisible_annotations = NULL; 1318 int runtime_invisible_annotations_length = 0; 1319 const u1* runtime_visible_type_annotations = NULL; 1320 int runtime_visible_type_annotations_length = 0; 1321 const u1* runtime_invisible_type_annotations = NULL; 1322 int runtime_invisible_type_annotations_length = 0; 1323 bool runtime_invisible_annotations_exists = false; 1324 bool runtime_invisible_type_annotations_exists = false; 1325 const ConstantPool* const cp = _cp; 1326 1327 while (attributes_count--) { 1328 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1329 const u2 attribute_name_index = cfs->get_u2_fast(); 1330 const u4 attribute_length = cfs->get_u4_fast(); 1331 check_property(valid_symbol_at(attribute_name_index), 1332 "Invalid field attribute index %u in class file %s", 1333 attribute_name_index, 1334 CHECK); 1335 1336 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1337 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1338 // ignore if non-static 1339 if (constantvalue_index != 0) { 1340 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1341 } 1342 check_property( 1343 attribute_length == 2, 1344 "Invalid ConstantValue field attribute length %u in class file %s", 1345 attribute_length, CHECK); 1346 1347 constantvalue_index = cfs->get_u2(CHECK); 1348 if (_need_verify) { 1349 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1350 } 1351 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1352 if (attribute_length != 0) { 1353 classfile_parse_error( 1354 "Invalid Synthetic field attribute length %u in class file %s", 1355 attribute_length, CHECK); 1356 } 1357 is_synthetic = true; 1358 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1359 if (attribute_length != 0) { 1360 classfile_parse_error( 1361 "Invalid Deprecated field attribute length %u in class file %s", 1362 attribute_length, CHECK); 1363 } 1364 } else if (_major_version >= JAVA_1_5_VERSION) { 1365 if (attribute_name == vmSymbols::tag_signature()) { 1366 if (generic_signature_index != 0) { 1367 classfile_parse_error( 1368 "Multiple Signature attributes for field in class file %s", CHECK); 1369 } 1370 if (attribute_length != 2) { 1371 classfile_parse_error( 1372 "Wrong size %u for field's Signature attribute in class file %s", 1373 attribute_length, CHECK); 1374 } 1375 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1376 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1377 if (runtime_visible_annotations != NULL) { 1378 classfile_parse_error( 1379 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1380 } 1381 runtime_visible_annotations_length = attribute_length; 1382 runtime_visible_annotations = cfs->current(); 1383 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1384 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1385 parse_annotations(cp, 1386 runtime_visible_annotations, 1387 runtime_visible_annotations_length, 1388 parsed_annotations, 1389 _loader_data, 1390 CHECK); 1391 cfs->skip_u1_fast(runtime_visible_annotations_length); 1392 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1393 if (runtime_invisible_annotations_exists) { 1394 classfile_parse_error( 1395 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1396 } 1397 runtime_invisible_annotations_exists = true; 1398 if (PreserveAllAnnotations) { 1399 runtime_invisible_annotations_length = attribute_length; 1400 runtime_invisible_annotations = cfs->current(); 1401 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1402 } 1403 cfs->skip_u1(attribute_length, CHECK); 1404 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1405 if (runtime_visible_type_annotations != NULL) { 1406 classfile_parse_error( 1407 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1408 } 1409 runtime_visible_type_annotations_length = attribute_length; 1410 runtime_visible_type_annotations = cfs->current(); 1411 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1412 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1413 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1414 if (runtime_invisible_type_annotations_exists) { 1415 classfile_parse_error( 1416 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1417 } else { 1418 runtime_invisible_type_annotations_exists = true; 1419 } 1420 if (PreserveAllAnnotations) { 1421 runtime_invisible_type_annotations_length = attribute_length; 1422 runtime_invisible_type_annotations = cfs->current(); 1423 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1424 } 1425 cfs->skip_u1(attribute_length, CHECK); 1426 } else { 1427 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1428 } 1429 } else { 1430 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1431 } 1432 } 1433 1434 *constantvalue_index_addr = constantvalue_index; 1435 *is_synthetic_addr = is_synthetic; 1436 *generic_signature_index_addr = generic_signature_index; 1437 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1438 runtime_visible_annotations_length, 1439 runtime_invisible_annotations, 1440 runtime_invisible_annotations_length, 1441 CHECK); 1442 parsed_annotations->set_field_annotations(a); 1443 a = assemble_annotations(runtime_visible_type_annotations, 1444 runtime_visible_type_annotations_length, 1445 runtime_invisible_type_annotations, 1446 runtime_invisible_type_annotations_length, 1447 CHECK); 1448 parsed_annotations->set_field_type_annotations(a); 1449 return; 1450 } 1451 1452 1453 // Field allocation types. Used for computing field offsets. 1454 1455 enum FieldAllocationType { 1456 STATIC_OOP, // Oops 1457 STATIC_BYTE, // Boolean, Byte, char 1458 STATIC_SHORT, // shorts 1459 STATIC_WORD, // ints 1460 STATIC_DOUBLE, // aligned long or double 1461 NONSTATIC_OOP, 1462 NONSTATIC_BYTE, 1463 NONSTATIC_SHORT, 1464 NONSTATIC_WORD, 1465 NONSTATIC_DOUBLE, 1466 MAX_FIELD_ALLOCATION_TYPE, 1467 BAD_ALLOCATION_TYPE = -1 1468 }; 1469 1470 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1471 BAD_ALLOCATION_TYPE, // 0 1472 BAD_ALLOCATION_TYPE, // 1 1473 BAD_ALLOCATION_TYPE, // 2 1474 BAD_ALLOCATION_TYPE, // 3 1475 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1476 NONSTATIC_SHORT, // T_CHAR = 5, 1477 NONSTATIC_WORD, // T_FLOAT = 6, 1478 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1479 NONSTATIC_BYTE, // T_BYTE = 8, 1480 NONSTATIC_SHORT, // T_SHORT = 9, 1481 NONSTATIC_WORD, // T_INT = 10, 1482 NONSTATIC_DOUBLE, // T_LONG = 11, 1483 NONSTATIC_OOP, // T_OBJECT = 12, 1484 NONSTATIC_OOP, // T_ARRAY = 13, 1485 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1486 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1487 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1488 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1489 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1490 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1491 BAD_ALLOCATION_TYPE, // 0 1492 BAD_ALLOCATION_TYPE, // 1 1493 BAD_ALLOCATION_TYPE, // 2 1494 BAD_ALLOCATION_TYPE, // 3 1495 STATIC_BYTE , // T_BOOLEAN = 4, 1496 STATIC_SHORT, // T_CHAR = 5, 1497 STATIC_WORD, // T_FLOAT = 6, 1498 STATIC_DOUBLE, // T_DOUBLE = 7, 1499 STATIC_BYTE, // T_BYTE = 8, 1500 STATIC_SHORT, // T_SHORT = 9, 1501 STATIC_WORD, // T_INT = 10, 1502 STATIC_DOUBLE, // T_LONG = 11, 1503 STATIC_OOP, // T_OBJECT = 12, 1504 STATIC_OOP, // T_ARRAY = 13, 1505 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1506 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1507 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1508 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1509 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1510 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1511 }; 1512 1513 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1514 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1515 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1516 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1517 return result; 1518 } 1519 1520 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1521 public: 1522 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1523 1524 FieldAllocationCount() { 1525 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1526 count[i] = 0; 1527 } 1528 } 1529 1530 FieldAllocationType update(bool is_static, BasicType type) { 1531 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1532 if (atype != BAD_ALLOCATION_TYPE) { 1533 // Make sure there is no overflow with injected fields. 1534 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1535 count[atype]++; 1536 } 1537 return atype; 1538 } 1539 }; 1540 1541 // Side-effects: populates the _fields, _fields_annotations, 1542 // _fields_type_annotations fields 1543 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1544 bool is_interface, 1545 FieldAllocationCount* const fac, 1546 ConstantPool* cp, 1547 const int cp_size, 1548 u2* const java_fields_count_ptr, 1549 TRAPS) { 1550 1551 assert(cfs != NULL, "invariant"); 1552 assert(fac != NULL, "invariant"); 1553 assert(cp != NULL, "invariant"); 1554 assert(java_fields_count_ptr != NULL, "invariant"); 1555 1556 assert(NULL == _fields, "invariant"); 1557 assert(NULL == _fields_annotations, "invariant"); 1558 assert(NULL == _fields_type_annotations, "invariant"); 1559 1560 cfs->guarantee_more(2, CHECK); // length 1561 const u2 length = cfs->get_u2_fast(); 1562 *java_fields_count_ptr = length; 1563 1564 int num_injected = 0; 1565 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1566 &num_injected); 1567 const int total_fields = length + num_injected; 1568 1569 // The field array starts with tuples of shorts 1570 // [access, name index, sig index, initial value index, byte offset]. 1571 // A generic signature slot only exists for field with generic 1572 // signature attribute. And the access flag is set with 1573 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1574 // signature slots are at the end of the field array and after all 1575 // other fields data. 1576 // 1577 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1578 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1579 // ... 1580 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1581 // [generic signature index] 1582 // [generic signature index] 1583 // ... 1584 // 1585 // Allocate a temporary resource array for field data. For each field, 1586 // a slot is reserved in the temporary array for the generic signature 1587 // index. After parsing all fields, the data are copied to a permanent 1588 // array and any unused slots will be discarded. 1589 ResourceMark rm(THREAD); 1590 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1591 u2, 1592 total_fields * (FieldInfo::field_slots + 1)); 1593 1594 // The generic signature slots start after all other fields' data. 1595 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1596 int num_generic_signature = 0; 1597 for (int n = 0; n < length; n++) { 1598 // access_flags, name_index, descriptor_index, attributes_count 1599 cfs->guarantee_more(8, CHECK); 1600 1601 AccessFlags access_flags; 1602 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1603 verify_legal_field_modifiers(flags, is_interface, CHECK); 1604 access_flags.set_flags(flags); 1605 1606 const u2 name_index = cfs->get_u2_fast(); 1607 check_property(valid_symbol_at(name_index), 1608 "Invalid constant pool index %u for field name in class file %s", 1609 name_index, CHECK); 1610 const Symbol* const name = cp->symbol_at(name_index); 1611 verify_legal_field_name(name, CHECK); 1612 1613 const u2 signature_index = cfs->get_u2_fast(); 1614 check_property(valid_symbol_at(signature_index), 1615 "Invalid constant pool index %u for field signature in class file %s", 1616 signature_index, CHECK); 1617 const Symbol* const sig = cp->symbol_at(signature_index); 1618 verify_legal_field_signature(name, sig, CHECK); 1619 1620 u2 constantvalue_index = 0; 1621 bool is_synthetic = false; 1622 u2 generic_signature_index = 0; 1623 const bool is_static = access_flags.is_static(); 1624 FieldAnnotationCollector parsed_annotations(_loader_data); 1625 1626 const u2 attributes_count = cfs->get_u2_fast(); 1627 if (attributes_count > 0) { 1628 parse_field_attributes(cfs, 1629 attributes_count, 1630 is_static, 1631 signature_index, 1632 &constantvalue_index, 1633 &is_synthetic, 1634 &generic_signature_index, 1635 &parsed_annotations, 1636 CHECK); 1637 1638 if (parsed_annotations.field_annotations() != NULL) { 1639 if (_fields_annotations == NULL) { 1640 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1641 _loader_data, length, NULL, 1642 CHECK); 1643 } 1644 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1645 parsed_annotations.set_field_annotations(NULL); 1646 } 1647 if (parsed_annotations.field_type_annotations() != NULL) { 1648 if (_fields_type_annotations == NULL) { 1649 _fields_type_annotations = 1650 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1651 length, 1652 NULL, 1653 CHECK); 1654 } 1655 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1656 parsed_annotations.set_field_type_annotations(NULL); 1657 } 1658 1659 if (is_synthetic) { 1660 access_flags.set_is_synthetic(); 1661 } 1662 if (generic_signature_index != 0) { 1663 access_flags.set_field_has_generic_signature(); 1664 fa[generic_signature_slot] = generic_signature_index; 1665 generic_signature_slot ++; 1666 num_generic_signature ++; 1667 } 1668 } 1669 1670 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1671 field->initialize(access_flags.as_short(), 1672 name_index, 1673 signature_index, 1674 constantvalue_index); 1675 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1676 1677 // Remember how many oops we encountered and compute allocation type 1678 const FieldAllocationType atype = fac->update(is_static, type); 1679 field->set_allocation_type(atype); 1680 1681 // After field is initialized with type, we can augment it with aux info 1682 if (parsed_annotations.has_any_annotations()) 1683 parsed_annotations.apply_to(field); 1684 } 1685 1686 int index = length; 1687 if (num_injected != 0) { 1688 for (int n = 0; n < num_injected; n++) { 1689 // Check for duplicates 1690 if (injected[n].may_be_java) { 1691 const Symbol* const name = injected[n].name(); 1692 const Symbol* const signature = injected[n].signature(); 1693 bool duplicate = false; 1694 for (int i = 0; i < length; i++) { 1695 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1696 if (name == cp->symbol_at(f->name_index()) && 1697 signature == cp->symbol_at(f->signature_index())) { 1698 // Symbol is desclared in Java so skip this one 1699 duplicate = true; 1700 break; 1701 } 1702 } 1703 if (duplicate) { 1704 // These will be removed from the field array at the end 1705 continue; 1706 } 1707 } 1708 1709 // Injected field 1710 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1711 field->initialize(JVM_ACC_FIELD_INTERNAL, 1712 injected[n].name_index, 1713 injected[n].signature_index, 1714 0); 1715 1716 const BasicType type = FieldType::basic_type(injected[n].signature()); 1717 1718 // Remember how many oops we encountered and compute allocation type 1719 const FieldAllocationType atype = fac->update(false, type); 1720 field->set_allocation_type(atype); 1721 index++; 1722 } 1723 } 1724 1725 assert(NULL == _fields, "invariant"); 1726 1727 _fields = 1728 MetadataFactory::new_array<u2>(_loader_data, 1729 index * FieldInfo::field_slots + num_generic_signature, 1730 CHECK); 1731 // Sometimes injected fields already exist in the Java source so 1732 // the fields array could be too long. In that case the 1733 // fields array is trimed. Also unused slots that were reserved 1734 // for generic signature indexes are discarded. 1735 { 1736 int i = 0; 1737 for (; i < index * FieldInfo::field_slots; i++) { 1738 _fields->at_put(i, fa[i]); 1739 } 1740 for (int j = total_fields * FieldInfo::field_slots; 1741 j < generic_signature_slot; j++) { 1742 _fields->at_put(i++, fa[j]); 1743 } 1744 assert(_fields->length() == i, ""); 1745 } 1746 1747 if (_need_verify && length > 1) { 1748 // Check duplicated fields 1749 ResourceMark rm(THREAD); 1750 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1751 THREAD, NameSigHash*, HASH_ROW_SIZE); 1752 initialize_hashtable(names_and_sigs); 1753 bool dup = false; 1754 const Symbol* name = NULL; 1755 const Symbol* sig = NULL; 1756 { 1757 debug_only(NoSafepointVerifier nsv;) 1758 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1759 name = fs.name(); 1760 sig = fs.signature(); 1761 // If no duplicates, add name/signature in hashtable names_and_sigs. 1762 if (!put_after_lookup(name, sig, names_and_sigs)) { 1763 dup = true; 1764 break; 1765 } 1766 } 1767 } 1768 if (dup) { 1769 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1770 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1771 } 1772 } 1773 } 1774 1775 1776 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1777 u4 code_length, 1778 u4 exception_table_length, 1779 TRAPS) { 1780 assert(cfs != NULL, "invariant"); 1781 1782 const unsafe_u2* const exception_table_start = cfs->current(); 1783 assert(exception_table_start != NULL, "null exception table"); 1784 1785 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1786 // end_pc, 1787 // handler_pc, 1788 // catch_type_index 1789 1790 // Will check legal target after parsing code array in verifier. 1791 if (_need_verify) { 1792 for (unsigned int i = 0; i < exception_table_length; i++) { 1793 const u2 start_pc = cfs->get_u2_fast(); 1794 const u2 end_pc = cfs->get_u2_fast(); 1795 const u2 handler_pc = cfs->get_u2_fast(); 1796 const u2 catch_type_index = cfs->get_u2_fast(); 1797 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1798 "Illegal exception table range in class file %s", 1799 CHECK_NULL); 1800 guarantee_property(handler_pc < code_length, 1801 "Illegal exception table handler in class file %s", 1802 CHECK_NULL); 1803 if (catch_type_index != 0) { 1804 guarantee_property(valid_klass_reference_at(catch_type_index), 1805 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1806 } 1807 } 1808 } else { 1809 cfs->skip_u2_fast(exception_table_length * 4); 1810 } 1811 return exception_table_start; 1812 } 1813 1814 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1815 u4 code_length, 1816 CompressedLineNumberWriteStream**const write_stream, 1817 TRAPS) { 1818 1819 const ClassFileStream* const cfs = _stream; 1820 unsigned int num_entries = cfs->get_u2(CHECK); 1821 1822 // Each entry is a u2 start_pc, and a u2 line_number 1823 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1824 1825 // Verify line number attribute and table length 1826 check_property( 1827 code_attribute_length == sizeof(u2) + length_in_bytes, 1828 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1829 1830 cfs->guarantee_more(length_in_bytes, CHECK); 1831 1832 if ((*write_stream) == NULL) { 1833 if (length_in_bytes > fixed_buffer_size) { 1834 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1835 } else { 1836 (*write_stream) = new CompressedLineNumberWriteStream( 1837 _linenumbertable_buffer, fixed_buffer_size); 1838 } 1839 } 1840 1841 while (num_entries-- > 0) { 1842 const u2 bci = cfs->get_u2_fast(); // start_pc 1843 const u2 line = cfs->get_u2_fast(); // line_number 1844 guarantee_property(bci < code_length, 1845 "Invalid pc in LineNumberTable in class file %s", CHECK); 1846 (*write_stream)->write_pair(bci, line); 1847 } 1848 } 1849 1850 1851 class LVT_Hash : public AllStatic { 1852 public: 1853 1854 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1855 /* 1856 * 3-tuple start_bci/length/slot has to be unique key, 1857 * so the following comparison seems to be redundant: 1858 * && elem->name_cp_index == entry->_elem->name_cp_index 1859 */ 1860 return (e0.start_bci == e1.start_bci && 1861 e0.length == e1.length && 1862 e0.name_cp_index == e1.name_cp_index && 1863 e0.slot == e1.slot); 1864 } 1865 1866 static unsigned int hash(LocalVariableTableElement const& e0) { 1867 unsigned int raw_hash = e0.start_bci; 1868 1869 raw_hash = e0.length + raw_hash * 37; 1870 raw_hash = e0.name_cp_index + raw_hash * 37; 1871 raw_hash = e0.slot + raw_hash * 37; 1872 1873 return raw_hash; 1874 } 1875 }; 1876 1877 1878 // Class file LocalVariableTable elements. 1879 class Classfile_LVT_Element { 1880 public: 1881 u2 start_bci; 1882 u2 length; 1883 u2 name_cp_index; 1884 u2 descriptor_cp_index; 1885 u2 slot; 1886 }; 1887 1888 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1889 LocalVariableTableElement* const lvt) { 1890 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1891 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1892 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1893 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1894 lvt->signature_cp_index = 0; 1895 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1896 } 1897 1898 // Function is used to parse both attributes: 1899 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1900 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1901 u4 code_length, 1902 u2 max_locals, 1903 u4 code_attribute_length, 1904 u2* const localvariable_table_length, 1905 bool isLVTT, 1906 TRAPS) { 1907 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1908 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1909 const unsigned int size = 1910 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1911 1912 const ConstantPool* const cp = _cp; 1913 1914 // Verify local variable table attribute has right length 1915 if (_need_verify) { 1916 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1917 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1918 } 1919 1920 const unsafe_u2* const localvariable_table_start = cfs->current(); 1921 assert(localvariable_table_start != NULL, "null local variable table"); 1922 if (!_need_verify) { 1923 cfs->skip_u2_fast(size); 1924 } else { 1925 cfs->guarantee_more(size * 2, CHECK_NULL); 1926 for(int i = 0; i < (*localvariable_table_length); i++) { 1927 const u2 start_pc = cfs->get_u2_fast(); 1928 const u2 length = cfs->get_u2_fast(); 1929 const u2 name_index = cfs->get_u2_fast(); 1930 const u2 descriptor_index = cfs->get_u2_fast(); 1931 const u2 index = cfs->get_u2_fast(); 1932 // Assign to a u4 to avoid overflow 1933 const u4 end_pc = (u4)start_pc + (u4)length; 1934 1935 if (start_pc >= code_length) { 1936 classfile_parse_error( 1937 "Invalid start_pc %u in %s in class file %s", 1938 start_pc, tbl_name, CHECK_NULL); 1939 } 1940 if (end_pc > code_length) { 1941 classfile_parse_error( 1942 "Invalid length %u in %s in class file %s", 1943 length, tbl_name, CHECK_NULL); 1944 } 1945 const int cp_size = cp->length(); 1946 guarantee_property(valid_symbol_at(name_index), 1947 "Name index %u in %s has bad constant type in class file %s", 1948 name_index, tbl_name, CHECK_NULL); 1949 guarantee_property(valid_symbol_at(descriptor_index), 1950 "Signature index %u in %s has bad constant type in class file %s", 1951 descriptor_index, tbl_name, CHECK_NULL); 1952 1953 const Symbol* const name = cp->symbol_at(name_index); 1954 const Symbol* const sig = cp->symbol_at(descriptor_index); 1955 verify_legal_field_name(name, CHECK_NULL); 1956 u2 extra_slot = 0; 1957 if (!isLVTT) { 1958 verify_legal_field_signature(name, sig, CHECK_NULL); 1959 1960 // 4894874: check special cases for double and long local variables 1961 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1962 sig == vmSymbols::type_signature(T_LONG)) { 1963 extra_slot = 1; 1964 } 1965 } 1966 guarantee_property((index + extra_slot) < max_locals, 1967 "Invalid index %u in %s in class file %s", 1968 index, tbl_name, CHECK_NULL); 1969 } 1970 } 1971 return localvariable_table_start; 1972 } 1973 1974 1975 void ClassFileParser::parse_type_array(u2 array_length, 1976 u4 code_length, 1977 u4* const u1_index, 1978 u4* const u2_index, 1979 u1* const u1_array, 1980 u2* const u2_array, 1981 TRAPS) { 1982 const ClassFileStream* const cfs = _stream; 1983 u2 index = 0; // index in the array with long/double occupying two slots 1984 u4 i1 = *u1_index; 1985 u4 i2 = *u2_index + 1; 1986 for(int i = 0; i < array_length; i++) { 1987 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1988 index++; 1989 if (tag == ITEM_Long || tag == ITEM_Double) { 1990 index++; 1991 } else if (tag == ITEM_Object) { 1992 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1993 guarantee_property(valid_klass_reference_at(class_index), 1994 "Bad class index %u in StackMap in class file %s", 1995 class_index, CHECK); 1996 } else if (tag == ITEM_Uninitialized) { 1997 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1998 guarantee_property( 1999 offset < code_length, 2000 "Bad uninitialized type offset %u in StackMap in class file %s", 2001 offset, CHECK); 2002 } else { 2003 guarantee_property( 2004 tag <= (u1)ITEM_Uninitialized, 2005 "Unknown variable type %u in StackMap in class file %s", 2006 tag, CHECK); 2007 } 2008 } 2009 u2_array[*u2_index] = index; 2010 *u1_index = i1; 2011 *u2_index = i2; 2012 } 2013 2014 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 2015 u4 code_attribute_length, 2016 bool need_verify, 2017 TRAPS) { 2018 assert(cfs != NULL, "invariant"); 2019 2020 if (0 == code_attribute_length) { 2021 return NULL; 2022 } 2023 2024 const u1* const stackmap_table_start = cfs->current(); 2025 assert(stackmap_table_start != NULL, "null stackmap table"); 2026 2027 // check code_attribute_length first 2028 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2029 2030 if (!need_verify && !DumpSharedSpaces) { 2031 return NULL; 2032 } 2033 return stackmap_table_start; 2034 } 2035 2036 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2037 u2* const checked_exceptions_length, 2038 u4 method_attribute_length, 2039 TRAPS) { 2040 assert(cfs != NULL, "invariant"); 2041 assert(checked_exceptions_length != NULL, "invariant"); 2042 2043 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2044 *checked_exceptions_length = cfs->get_u2_fast(); 2045 const unsigned int size = 2046 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2047 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2048 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2049 if (!_need_verify) { 2050 cfs->skip_u2_fast(size); 2051 } else { 2052 // Verify each value in the checked exception table 2053 u2 checked_exception; 2054 const u2 len = *checked_exceptions_length; 2055 cfs->guarantee_more(2 * len, CHECK_NULL); 2056 for (int i = 0; i < len; i++) { 2057 checked_exception = cfs->get_u2_fast(); 2058 check_property( 2059 valid_klass_reference_at(checked_exception), 2060 "Exception name has bad type at constant pool %u in class file %s", 2061 checked_exception, CHECK_NULL); 2062 } 2063 } 2064 // check exceptions attribute length 2065 if (_need_verify) { 2066 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2067 sizeof(u2) * size), 2068 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2069 } 2070 return checked_exceptions_start; 2071 } 2072 2073 void ClassFileParser::throwIllegalSignature(const char* type, 2074 const Symbol* name, 2075 const Symbol* sig, 2076 TRAPS) const { 2077 assert(name != NULL, "invariant"); 2078 assert(sig != NULL, "invariant"); 2079 2080 ResourceMark rm(THREAD); 2081 Exceptions::fthrow(THREAD_AND_LOCATION, 2082 vmSymbols::java_lang_ClassFormatError(), 2083 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2084 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2085 } 2086 2087 AnnotationCollector::ID 2088 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2089 const Symbol* name) { 2090 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2091 // Privileged code can use all annotations. Other code silently drops some. 2092 const bool privileged = loader_data->is_the_null_class_loader_data() || 2093 loader_data->is_platform_class_loader_data() || 2094 loader_data->is_unsafe_anonymous(); 2095 switch (sid) { 2096 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2097 if (_location != _in_method) break; // only allow for methods 2098 if (!privileged) break; // only allow in privileged code 2099 return _method_CallerSensitive; 2100 } 2101 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2102 if (_location != _in_method) break; // only allow for methods 2103 if (!privileged) break; // only allow in privileged code 2104 return _method_ForceInline; 2105 } 2106 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2107 if (_location != _in_method) break; // only allow for methods 2108 if (!privileged) break; // only allow in privileged code 2109 return _method_DontInline; 2110 } 2111 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2112 if (_location != _in_method) break; // only allow for methods 2113 if (!privileged) break; // only allow in privileged code 2114 return _method_InjectedProfile; 2115 } 2116 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2117 if (_location != _in_method) break; // only allow for methods 2118 if (!privileged) break; // only allow in privileged code 2119 return _method_LambdaForm_Compiled; 2120 } 2121 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): { 2122 if (_location != _in_method) break; // only allow for methods 2123 if (!privileged) break; // only allow in privileged code 2124 return _method_Hidden; 2125 } 2126 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_security_AccessController_Hidden_signature): { 2127 if (_location != _in_method) break; // only allow for methods 2128 if (!privileged) break; // only allow in privileged code 2129 return _method_Hidden; 2130 } 2131 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2132 if (_location != _in_method) break; // only allow for methods 2133 if (!privileged) break; // only allow in privileged code 2134 return _method_HotSpotIntrinsicCandidate; 2135 } 2136 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2137 if (_location != _in_field) break; // only allow for fields 2138 if (!privileged) break; // only allow in privileged code 2139 return _field_Stable; 2140 } 2141 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2142 if (_location != _in_field && _location != _in_class) { 2143 break; // only allow for fields and classes 2144 } 2145 if (!EnableContended || (RestrictContended && !privileged)) { 2146 break; // honor privileges 2147 } 2148 return _jdk_internal_vm_annotation_Contended; 2149 } 2150 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2151 if (_location != _in_method) break; // only allow for methods 2152 if (RestrictReservedStack && !privileged) break; // honor privileges 2153 return _jdk_internal_vm_annotation_ReservedStackAccess; 2154 } 2155 default: { 2156 break; 2157 } 2158 } 2159 return AnnotationCollector::_unknown; 2160 } 2161 2162 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2163 if (is_contended()) 2164 f->set_contended_group(contended_group()); 2165 if (is_stable()) 2166 f->set_stable(true); 2167 } 2168 2169 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2170 // If there's an error deallocate metadata for field annotations 2171 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2172 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2173 } 2174 2175 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2176 if (has_annotation(_method_CallerSensitive)) 2177 m->set_caller_sensitive(true); 2178 if (has_annotation(_method_ForceInline)) 2179 m->set_force_inline(true); 2180 if (has_annotation(_method_DontInline)) 2181 m->set_dont_inline(true); 2182 if (has_annotation(_method_InjectedProfile)) 2183 m->set_has_injected_profile(true); 2184 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2185 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2186 if (has_annotation(_method_Hidden)) 2187 m->set_hidden(true); 2188 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2189 m->set_intrinsic_candidate(true); 2190 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2191 m->set_has_reserved_stack_access(true); 2192 } 2193 2194 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2195 assert(ik != NULL, "invariant"); 2196 ik->set_is_contended(is_contended()); 2197 } 2198 2199 #define MAX_ARGS_SIZE 255 2200 #define MAX_CODE_SIZE 65535 2201 #define INITIAL_MAX_LVT_NUMBER 256 2202 2203 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2204 * 2205 * Rules for LVT's and LVTT's are: 2206 * - There can be any number of LVT's and LVTT's. 2207 * - If there are n LVT's, it is the same as if there was just 2208 * one LVT containing all the entries from the n LVT's. 2209 * - There may be no more than one LVT entry per local variable. 2210 * Two LVT entries are 'equal' if these fields are the same: 2211 * start_pc, length, name, slot 2212 * - There may be no more than one LVTT entry per each LVT entry. 2213 * Each LVTT entry has to match some LVT entry. 2214 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2215 */ 2216 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2217 int lvt_cnt, 2218 u2* const localvariable_table_length, 2219 const unsafe_u2** const localvariable_table_start, 2220 int lvtt_cnt, 2221 u2* const localvariable_type_table_length, 2222 const unsafe_u2** const localvariable_type_table_start, 2223 TRAPS) { 2224 2225 ResourceMark rm(THREAD); 2226 2227 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2228 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2229 2230 LVT_HashTable* const table = new LVT_HashTable(); 2231 2232 // To fill LocalVariableTable in 2233 const Classfile_LVT_Element* cf_lvt; 2234 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2235 2236 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2237 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2238 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2239 copy_lvt_element(&cf_lvt[idx], lvt); 2240 // If no duplicates, add LVT elem in hashtable. 2241 if (table->put(*lvt, lvt) == false 2242 && _need_verify 2243 && _major_version >= JAVA_1_5_VERSION) { 2244 classfile_parse_error("Duplicated LocalVariableTable attribute " 2245 "entry for '%s' in class file %s", 2246 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2247 CHECK); 2248 } 2249 } 2250 } 2251 2252 // To merge LocalVariableTable and LocalVariableTypeTable 2253 const Classfile_LVT_Element* cf_lvtt; 2254 LocalVariableTableElement lvtt_elem; 2255 2256 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2257 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2258 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2259 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2260 LocalVariableTableElement** entry = table->get(lvtt_elem); 2261 if (entry == NULL) { 2262 if (_need_verify) { 2263 classfile_parse_error("LVTT entry for '%s' in class file %s " 2264 "does not match any LVT entry", 2265 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2266 CHECK); 2267 } 2268 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2269 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2270 "entry for '%s' in class file %s", 2271 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2272 CHECK); 2273 } else { 2274 // to add generic signatures into LocalVariableTable 2275 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2276 } 2277 } 2278 } 2279 } 2280 2281 2282 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2283 const u1* runtime_visible_annotations, 2284 int runtime_visible_annotations_length, 2285 const u1* runtime_invisible_annotations, 2286 int runtime_invisible_annotations_length, 2287 const u1* runtime_visible_parameter_annotations, 2288 int runtime_visible_parameter_annotations_length, 2289 const u1* runtime_invisible_parameter_annotations, 2290 int runtime_invisible_parameter_annotations_length, 2291 const u1* runtime_visible_type_annotations, 2292 int runtime_visible_type_annotations_length, 2293 const u1* runtime_invisible_type_annotations, 2294 int runtime_invisible_type_annotations_length, 2295 const u1* annotation_default, 2296 int annotation_default_length, 2297 TRAPS) { 2298 2299 AnnotationArray* a; 2300 2301 if (runtime_visible_annotations_length + 2302 runtime_invisible_annotations_length > 0) { 2303 a = assemble_annotations(runtime_visible_annotations, 2304 runtime_visible_annotations_length, 2305 runtime_invisible_annotations, 2306 runtime_invisible_annotations_length, 2307 CHECK); 2308 cm->set_method_annotations(a); 2309 } 2310 2311 if (runtime_visible_parameter_annotations_length + 2312 runtime_invisible_parameter_annotations_length > 0) { 2313 a = assemble_annotations(runtime_visible_parameter_annotations, 2314 runtime_visible_parameter_annotations_length, 2315 runtime_invisible_parameter_annotations, 2316 runtime_invisible_parameter_annotations_length, 2317 CHECK); 2318 cm->set_parameter_annotations(a); 2319 } 2320 2321 if (annotation_default_length > 0) { 2322 a = assemble_annotations(annotation_default, 2323 annotation_default_length, 2324 NULL, 2325 0, 2326 CHECK); 2327 cm->set_default_annotations(a); 2328 } 2329 2330 if (runtime_visible_type_annotations_length + 2331 runtime_invisible_type_annotations_length > 0) { 2332 a = assemble_annotations(runtime_visible_type_annotations, 2333 runtime_visible_type_annotations_length, 2334 runtime_invisible_type_annotations, 2335 runtime_invisible_type_annotations_length, 2336 CHECK); 2337 cm->set_type_annotations(a); 2338 } 2339 } 2340 2341 2342 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2343 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2344 // Method* to save footprint, so we only know the size of the resulting Method* when the 2345 // entire method attribute is parsed. 2346 // 2347 // The promoted_flags parameter is used to pass relevant access_flags 2348 // from the method back up to the containing klass. These flag values 2349 // are added to klass's access_flags. 2350 2351 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2352 bool is_interface, 2353 const ConstantPool* cp, 2354 AccessFlags* const promoted_flags, 2355 TRAPS) { 2356 assert(cfs != NULL, "invariant"); 2357 assert(cp != NULL, "invariant"); 2358 assert(promoted_flags != NULL, "invariant"); 2359 2360 ResourceMark rm(THREAD); 2361 // Parse fixed parts: 2362 // access_flags, name_index, descriptor_index, attributes_count 2363 cfs->guarantee_more(8, CHECK_NULL); 2364 2365 int flags = cfs->get_u2_fast(); 2366 const u2 name_index = cfs->get_u2_fast(); 2367 const int cp_size = cp->length(); 2368 check_property( 2369 valid_symbol_at(name_index), 2370 "Illegal constant pool index %u for method name in class file %s", 2371 name_index, CHECK_NULL); 2372 const Symbol* const name = cp->symbol_at(name_index); 2373 verify_legal_method_name(name, CHECK_NULL); 2374 2375 const u2 signature_index = cfs->get_u2_fast(); 2376 guarantee_property( 2377 valid_symbol_at(signature_index), 2378 "Illegal constant pool index %u for method signature in class file %s", 2379 signature_index, CHECK_NULL); 2380 const Symbol* const signature = cp->symbol_at(signature_index); 2381 2382 if (name == vmSymbols::class_initializer_name()) { 2383 // We ignore the other access flags for a valid class initializer. 2384 // (JVM Spec 2nd ed., chapter 4.6) 2385 if (_major_version < 51) { // backward compatibility 2386 flags = JVM_ACC_STATIC; 2387 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2388 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2389 } else { 2390 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2391 } 2392 } else { 2393 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2394 } 2395 2396 if (name == vmSymbols::object_initializer_name() && is_interface) { 2397 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2398 } 2399 2400 int args_size = -1; // only used when _need_verify is true 2401 if (_need_verify) { 2402 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2403 verify_legal_method_signature(name, signature, CHECK_NULL); 2404 if (args_size > MAX_ARGS_SIZE) { 2405 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2406 } 2407 } 2408 2409 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2410 2411 // Default values for code and exceptions attribute elements 2412 u2 max_stack = 0; 2413 u2 max_locals = 0; 2414 u4 code_length = 0; 2415 const u1* code_start = 0; 2416 u2 exception_table_length = 0; 2417 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2418 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2419 u2 checked_exceptions_length = 0; 2420 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2421 CompressedLineNumberWriteStream* linenumber_table = NULL; 2422 int linenumber_table_length = 0; 2423 int total_lvt_length = 0; 2424 u2 lvt_cnt = 0; 2425 u2 lvtt_cnt = 0; 2426 bool lvt_allocated = false; 2427 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2428 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2429 u2* localvariable_table_length = NULL; 2430 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2431 u2* localvariable_type_table_length = NULL; 2432 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2433 int method_parameters_length = -1; 2434 const u1* method_parameters_data = NULL; 2435 bool method_parameters_seen = false; 2436 bool parsed_code_attribute = false; 2437 bool parsed_checked_exceptions_attribute = false; 2438 bool parsed_stackmap_attribute = false; 2439 // stackmap attribute - JDK1.5 2440 const u1* stackmap_data = NULL; 2441 int stackmap_data_length = 0; 2442 u2 generic_signature_index = 0; 2443 MethodAnnotationCollector parsed_annotations; 2444 const u1* runtime_visible_annotations = NULL; 2445 int runtime_visible_annotations_length = 0; 2446 const u1* runtime_invisible_annotations = NULL; 2447 int runtime_invisible_annotations_length = 0; 2448 const u1* runtime_visible_parameter_annotations = NULL; 2449 int runtime_visible_parameter_annotations_length = 0; 2450 const u1* runtime_invisible_parameter_annotations = NULL; 2451 int runtime_invisible_parameter_annotations_length = 0; 2452 const u1* runtime_visible_type_annotations = NULL; 2453 int runtime_visible_type_annotations_length = 0; 2454 const u1* runtime_invisible_type_annotations = NULL; 2455 int runtime_invisible_type_annotations_length = 0; 2456 bool runtime_invisible_annotations_exists = false; 2457 bool runtime_invisible_type_annotations_exists = false; 2458 bool runtime_invisible_parameter_annotations_exists = false; 2459 const u1* annotation_default = NULL; 2460 int annotation_default_length = 0; 2461 2462 // Parse code and exceptions attribute 2463 u2 method_attributes_count = cfs->get_u2_fast(); 2464 while (method_attributes_count--) { 2465 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2466 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2467 const u4 method_attribute_length = cfs->get_u4_fast(); 2468 check_property( 2469 valid_symbol_at(method_attribute_name_index), 2470 "Invalid method attribute name index %u in class file %s", 2471 method_attribute_name_index, CHECK_NULL); 2472 2473 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2474 if (method_attribute_name == vmSymbols::tag_code()) { 2475 // Parse Code attribute 2476 if (_need_verify) { 2477 guarantee_property( 2478 !access_flags.is_native() && !access_flags.is_abstract(), 2479 "Code attribute in native or abstract methods in class file %s", 2480 CHECK_NULL); 2481 } 2482 if (parsed_code_attribute) { 2483 classfile_parse_error("Multiple Code attributes in class file %s", 2484 CHECK_NULL); 2485 } 2486 parsed_code_attribute = true; 2487 2488 // Stack size, locals size, and code size 2489 if (_major_version == 45 && _minor_version <= 2) { 2490 cfs->guarantee_more(4, CHECK_NULL); 2491 max_stack = cfs->get_u1_fast(); 2492 max_locals = cfs->get_u1_fast(); 2493 code_length = cfs->get_u2_fast(); 2494 } else { 2495 cfs->guarantee_more(8, CHECK_NULL); 2496 max_stack = cfs->get_u2_fast(); 2497 max_locals = cfs->get_u2_fast(); 2498 code_length = cfs->get_u4_fast(); 2499 } 2500 if (_need_verify) { 2501 guarantee_property(args_size <= max_locals, 2502 "Arguments can't fit into locals in class file %s", 2503 CHECK_NULL); 2504 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2505 "Invalid method Code length %u in class file %s", 2506 code_length, CHECK_NULL); 2507 } 2508 // Code pointer 2509 code_start = cfs->current(); 2510 assert(code_start != NULL, "null code start"); 2511 cfs->guarantee_more(code_length, CHECK_NULL); 2512 cfs->skip_u1_fast(code_length); 2513 2514 // Exception handler table 2515 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2516 exception_table_length = cfs->get_u2_fast(); 2517 if (exception_table_length > 0) { 2518 exception_table_start = parse_exception_table(cfs, 2519 code_length, 2520 exception_table_length, 2521 CHECK_NULL); 2522 } 2523 2524 // Parse additional attributes in code attribute 2525 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2526 u2 code_attributes_count = cfs->get_u2_fast(); 2527 2528 unsigned int calculated_attribute_length = 0; 2529 2530 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2531 calculated_attribute_length = 2532 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2533 } else { 2534 // max_stack, locals and length are smaller in pre-version 45.2 classes 2535 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2536 } 2537 calculated_attribute_length += 2538 code_length + 2539 sizeof(exception_table_length) + 2540 sizeof(code_attributes_count) + 2541 exception_table_length * 2542 ( sizeof(u2) + // start_pc 2543 sizeof(u2) + // end_pc 2544 sizeof(u2) + // handler_pc 2545 sizeof(u2) ); // catch_type_index 2546 2547 while (code_attributes_count--) { 2548 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2549 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2550 const u4 code_attribute_length = cfs->get_u4_fast(); 2551 calculated_attribute_length += code_attribute_length + 2552 sizeof(code_attribute_name_index) + 2553 sizeof(code_attribute_length); 2554 check_property(valid_symbol_at(code_attribute_name_index), 2555 "Invalid code attribute name index %u in class file %s", 2556 code_attribute_name_index, 2557 CHECK_NULL); 2558 if (LoadLineNumberTables && 2559 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2560 // Parse and compress line number table 2561 parse_linenumber_table(code_attribute_length, 2562 code_length, 2563 &linenumber_table, 2564 CHECK_NULL); 2565 2566 } else if (LoadLocalVariableTables && 2567 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2568 // Parse local variable table 2569 if (!lvt_allocated) { 2570 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2571 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2572 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2573 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2574 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2575 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2576 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2577 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2578 lvt_allocated = true; 2579 } 2580 if (lvt_cnt == max_lvt_cnt) { 2581 max_lvt_cnt <<= 1; 2582 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2583 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2584 } 2585 localvariable_table_start[lvt_cnt] = 2586 parse_localvariable_table(cfs, 2587 code_length, 2588 max_locals, 2589 code_attribute_length, 2590 &localvariable_table_length[lvt_cnt], 2591 false, // is not LVTT 2592 CHECK_NULL); 2593 total_lvt_length += localvariable_table_length[lvt_cnt]; 2594 lvt_cnt++; 2595 } else if (LoadLocalVariableTypeTables && 2596 _major_version >= JAVA_1_5_VERSION && 2597 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2598 if (!lvt_allocated) { 2599 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2600 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2601 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2602 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2603 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2604 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2605 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2606 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2607 lvt_allocated = true; 2608 } 2609 // Parse local variable type table 2610 if (lvtt_cnt == max_lvtt_cnt) { 2611 max_lvtt_cnt <<= 1; 2612 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2613 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2614 } 2615 localvariable_type_table_start[lvtt_cnt] = 2616 parse_localvariable_table(cfs, 2617 code_length, 2618 max_locals, 2619 code_attribute_length, 2620 &localvariable_type_table_length[lvtt_cnt], 2621 true, // is LVTT 2622 CHECK_NULL); 2623 lvtt_cnt++; 2624 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2625 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2626 // Stack map is only needed by the new verifier in JDK1.5. 2627 if (parsed_stackmap_attribute) { 2628 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2629 } 2630 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2631 stackmap_data_length = code_attribute_length; 2632 parsed_stackmap_attribute = true; 2633 } else { 2634 // Skip unknown attributes 2635 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2636 } 2637 } 2638 // check method attribute length 2639 if (_need_verify) { 2640 guarantee_property(method_attribute_length == calculated_attribute_length, 2641 "Code segment has wrong length in class file %s", 2642 CHECK_NULL); 2643 } 2644 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2645 // Parse Exceptions attribute 2646 if (parsed_checked_exceptions_attribute) { 2647 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2648 CHECK_NULL); 2649 } 2650 parsed_checked_exceptions_attribute = true; 2651 checked_exceptions_start = 2652 parse_checked_exceptions(cfs, 2653 &checked_exceptions_length, 2654 method_attribute_length, 2655 CHECK_NULL); 2656 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2657 // reject multiple method parameters 2658 if (method_parameters_seen) { 2659 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2660 CHECK_NULL); 2661 } 2662 method_parameters_seen = true; 2663 method_parameters_length = cfs->get_u1_fast(); 2664 const u2 real_length = (method_parameters_length * 4u) + 1u; 2665 if (method_attribute_length != real_length) { 2666 classfile_parse_error( 2667 "Invalid MethodParameters method attribute length %u in class file", 2668 method_attribute_length, CHECK_NULL); 2669 } 2670 method_parameters_data = cfs->current(); 2671 cfs->skip_u2_fast(method_parameters_length); 2672 cfs->skip_u2_fast(method_parameters_length); 2673 // ignore this attribute if it cannot be reflected 2674 if (!SystemDictionary::Parameter_klass_loaded()) 2675 method_parameters_length = -1; 2676 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2677 if (method_attribute_length != 0) { 2678 classfile_parse_error( 2679 "Invalid Synthetic method attribute length %u in class file %s", 2680 method_attribute_length, CHECK_NULL); 2681 } 2682 // Should we check that there hasn't already been a synthetic attribute? 2683 access_flags.set_is_synthetic(); 2684 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2685 if (method_attribute_length != 0) { 2686 classfile_parse_error( 2687 "Invalid Deprecated method attribute length %u in class file %s", 2688 method_attribute_length, CHECK_NULL); 2689 } 2690 } else if (_major_version >= JAVA_1_5_VERSION) { 2691 if (method_attribute_name == vmSymbols::tag_signature()) { 2692 if (generic_signature_index != 0) { 2693 classfile_parse_error( 2694 "Multiple Signature attributes for method in class file %s", 2695 CHECK_NULL); 2696 } 2697 if (method_attribute_length != 2) { 2698 classfile_parse_error( 2699 "Invalid Signature attribute length %u in class file %s", 2700 method_attribute_length, CHECK_NULL); 2701 } 2702 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2703 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2704 if (runtime_visible_annotations != NULL) { 2705 classfile_parse_error( 2706 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2707 CHECK_NULL); 2708 } 2709 runtime_visible_annotations_length = method_attribute_length; 2710 runtime_visible_annotations = cfs->current(); 2711 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2712 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2713 parse_annotations(cp, 2714 runtime_visible_annotations, 2715 runtime_visible_annotations_length, 2716 &parsed_annotations, 2717 _loader_data, 2718 CHECK_NULL); 2719 cfs->skip_u1_fast(runtime_visible_annotations_length); 2720 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2721 if (runtime_invisible_annotations_exists) { 2722 classfile_parse_error( 2723 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2724 CHECK_NULL); 2725 } 2726 runtime_invisible_annotations_exists = true; 2727 if (PreserveAllAnnotations) { 2728 runtime_invisible_annotations_length = method_attribute_length; 2729 runtime_invisible_annotations = cfs->current(); 2730 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2731 } 2732 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2733 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2734 if (runtime_visible_parameter_annotations != NULL) { 2735 classfile_parse_error( 2736 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2737 CHECK_NULL); 2738 } 2739 runtime_visible_parameter_annotations_length = method_attribute_length; 2740 runtime_visible_parameter_annotations = cfs->current(); 2741 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2742 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2743 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2744 if (runtime_invisible_parameter_annotations_exists) { 2745 classfile_parse_error( 2746 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2747 CHECK_NULL); 2748 } 2749 runtime_invisible_parameter_annotations_exists = true; 2750 if (PreserveAllAnnotations) { 2751 runtime_invisible_parameter_annotations_length = method_attribute_length; 2752 runtime_invisible_parameter_annotations = cfs->current(); 2753 assert(runtime_invisible_parameter_annotations != NULL, 2754 "null invisible parameter annotations"); 2755 } 2756 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2757 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2758 if (annotation_default != NULL) { 2759 classfile_parse_error( 2760 "Multiple AnnotationDefault attributes for method in class file %s", 2761 CHECK_NULL); 2762 } 2763 annotation_default_length = method_attribute_length; 2764 annotation_default = cfs->current(); 2765 assert(annotation_default != NULL, "null annotation default"); 2766 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2767 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2768 if (runtime_visible_type_annotations != NULL) { 2769 classfile_parse_error( 2770 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2771 CHECK_NULL); 2772 } 2773 runtime_visible_type_annotations_length = method_attribute_length; 2774 runtime_visible_type_annotations = cfs->current(); 2775 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2776 // No need for the VM to parse Type annotations 2777 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2778 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2779 if (runtime_invisible_type_annotations_exists) { 2780 classfile_parse_error( 2781 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2782 CHECK_NULL); 2783 } else { 2784 runtime_invisible_type_annotations_exists = true; 2785 } 2786 if (PreserveAllAnnotations) { 2787 runtime_invisible_type_annotations_length = method_attribute_length; 2788 runtime_invisible_type_annotations = cfs->current(); 2789 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2790 } 2791 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2792 } else { 2793 // Skip unknown attributes 2794 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2795 } 2796 } else { 2797 // Skip unknown attributes 2798 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2799 } 2800 } 2801 2802 if (linenumber_table != NULL) { 2803 linenumber_table->write_terminator(); 2804 linenumber_table_length = linenumber_table->position(); 2805 } 2806 2807 // Make sure there's at least one Code attribute in non-native/non-abstract method 2808 if (_need_verify) { 2809 guarantee_property(access_flags.is_native() || 2810 access_flags.is_abstract() || 2811 parsed_code_attribute, 2812 "Absent Code attribute in method that is not native or abstract in class file %s", 2813 CHECK_NULL); 2814 } 2815 2816 // All sizing information for a Method* is finally available, now create it 2817 InlineTableSizes sizes( 2818 total_lvt_length, 2819 linenumber_table_length, 2820 exception_table_length, 2821 checked_exceptions_length, 2822 method_parameters_length, 2823 generic_signature_index, 2824 runtime_visible_annotations_length + 2825 runtime_invisible_annotations_length, 2826 runtime_visible_parameter_annotations_length + 2827 runtime_invisible_parameter_annotations_length, 2828 runtime_visible_type_annotations_length + 2829 runtime_invisible_type_annotations_length, 2830 annotation_default_length, 2831 0); 2832 2833 Method* const m = Method::allocate(_loader_data, 2834 code_length, 2835 access_flags, 2836 &sizes, 2837 ConstMethod::NORMAL, 2838 CHECK_NULL); 2839 2840 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2841 2842 // Fill in information from fixed part (access_flags already set) 2843 m->set_constants(_cp); 2844 m->set_name_index(name_index); 2845 m->set_signature_index(signature_index); 2846 2847 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 2848 m->constMethod()->set_result_type(rtf.type()); 2849 2850 if (args_size >= 0) { 2851 m->set_size_of_parameters(args_size); 2852 } else { 2853 m->compute_size_of_parameters(THREAD); 2854 } 2855 #ifdef ASSERT 2856 if (args_size >= 0) { 2857 m->compute_size_of_parameters(THREAD); 2858 assert(args_size == m->size_of_parameters(), ""); 2859 } 2860 #endif 2861 2862 // Fill in code attribute information 2863 m->set_max_stack(max_stack); 2864 m->set_max_locals(max_locals); 2865 if (stackmap_data != NULL) { 2866 m->constMethod()->copy_stackmap_data(_loader_data, 2867 (u1*)stackmap_data, 2868 stackmap_data_length, 2869 CHECK_NULL); 2870 } 2871 2872 // Copy byte codes 2873 m->set_code((u1*)code_start); 2874 2875 // Copy line number table 2876 if (linenumber_table != NULL) { 2877 memcpy(m->compressed_linenumber_table(), 2878 linenumber_table->buffer(), 2879 linenumber_table_length); 2880 } 2881 2882 // Copy exception table 2883 if (exception_table_length > 0) { 2884 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2885 m->exception_table_start(), 2886 exception_table_length * sizeof(ExceptionTableElement), 2887 sizeof(u2)); 2888 } 2889 2890 // Copy method parameters 2891 if (method_parameters_length > 0) { 2892 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2893 for (int i = 0; i < method_parameters_length; i++) { 2894 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2895 method_parameters_data += 2; 2896 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2897 method_parameters_data += 2; 2898 } 2899 } 2900 2901 // Copy checked exceptions 2902 if (checked_exceptions_length > 0) { 2903 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2904 m->checked_exceptions_start(), 2905 checked_exceptions_length * sizeof(CheckedExceptionElement), 2906 sizeof(u2)); 2907 } 2908 2909 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2910 if (total_lvt_length > 0) { 2911 promoted_flags->set_has_localvariable_table(); 2912 copy_localvariable_table(m->constMethod(), 2913 lvt_cnt, 2914 localvariable_table_length, 2915 localvariable_table_start, 2916 lvtt_cnt, 2917 localvariable_type_table_length, 2918 localvariable_type_table_start, 2919 CHECK_NULL); 2920 } 2921 2922 if (parsed_annotations.has_any_annotations()) 2923 parsed_annotations.apply_to(m); 2924 2925 // Copy annotations 2926 copy_method_annotations(m->constMethod(), 2927 runtime_visible_annotations, 2928 runtime_visible_annotations_length, 2929 runtime_invisible_annotations, 2930 runtime_invisible_annotations_length, 2931 runtime_visible_parameter_annotations, 2932 runtime_visible_parameter_annotations_length, 2933 runtime_invisible_parameter_annotations, 2934 runtime_invisible_parameter_annotations_length, 2935 runtime_visible_type_annotations, 2936 runtime_visible_type_annotations_length, 2937 runtime_invisible_type_annotations, 2938 runtime_invisible_type_annotations_length, 2939 annotation_default, 2940 annotation_default_length, 2941 CHECK_NULL); 2942 2943 if (name == vmSymbols::finalize_method_name() && 2944 signature == vmSymbols::void_method_signature()) { 2945 if (m->is_empty_method()) { 2946 _has_empty_finalizer = true; 2947 } else { 2948 _has_finalizer = true; 2949 } 2950 } 2951 if (name == vmSymbols::object_initializer_name() && 2952 signature == vmSymbols::void_method_signature() && 2953 m->is_vanilla_constructor()) { 2954 _has_vanilla_constructor = true; 2955 } 2956 2957 NOT_PRODUCT(m->verify()); 2958 return m; 2959 } 2960 2961 2962 // The promoted_flags parameter is used to pass relevant access_flags 2963 // from the methods back up to the containing klass. These flag values 2964 // are added to klass's access_flags. 2965 // Side-effects: populates the _methods field in the parser 2966 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2967 bool is_interface, 2968 AccessFlags* promoted_flags, 2969 bool* has_final_method, 2970 bool* declares_nonstatic_concrete_methods, 2971 TRAPS) { 2972 assert(cfs != NULL, "invariant"); 2973 assert(promoted_flags != NULL, "invariant"); 2974 assert(has_final_method != NULL, "invariant"); 2975 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 2976 2977 assert(NULL == _methods, "invariant"); 2978 2979 cfs->guarantee_more(2, CHECK); // length 2980 const u2 length = cfs->get_u2_fast(); 2981 if (length == 0) { 2982 _methods = Universe::the_empty_method_array(); 2983 } else { 2984 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2985 length, 2986 NULL, 2987 CHECK); 2988 2989 for (int index = 0; index < length; index++) { 2990 Method* method = parse_method(cfs, 2991 is_interface, 2992 _cp, 2993 promoted_flags, 2994 CHECK); 2995 2996 if (method->is_final()) { 2997 *has_final_method = true; 2998 } 2999 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 3000 // used for interface initialization, and default method inheritance analysis 3001 if (is_interface && !(*declares_nonstatic_concrete_methods) 3002 && !method->is_abstract() && !method->is_static()) { 3003 *declares_nonstatic_concrete_methods = true; 3004 } 3005 _methods->at_put(index, method); 3006 } 3007 3008 if (_need_verify && length > 1) { 3009 // Check duplicated methods 3010 ResourceMark rm(THREAD); 3011 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 3012 THREAD, NameSigHash*, HASH_ROW_SIZE); 3013 initialize_hashtable(names_and_sigs); 3014 bool dup = false; 3015 const Symbol* name = NULL; 3016 const Symbol* sig = NULL; 3017 { 3018 debug_only(NoSafepointVerifier nsv;) 3019 for (int i = 0; i < length; i++) { 3020 const Method* const m = _methods->at(i); 3021 name = m->name(); 3022 sig = m->signature(); 3023 // If no duplicates, add name/signature in hashtable names_and_sigs. 3024 if (!put_after_lookup(name, sig, names_and_sigs)) { 3025 dup = true; 3026 break; 3027 } 3028 } 3029 } 3030 if (dup) { 3031 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 3032 name->as_C_string(), sig->as_klass_external_name(), CHECK); 3033 } 3034 } 3035 } 3036 } 3037 3038 static const intArray* sort_methods(Array<Method*>* methods) { 3039 const int length = methods->length(); 3040 // If JVMTI original method ordering or sharing is enabled we have to 3041 // remember the original class file ordering. 3042 // We temporarily use the vtable_index field in the Method* to store the 3043 // class file index, so we can read in after calling qsort. 3044 // Put the method ordering in the shared archive. 3045 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3046 for (int index = 0; index < length; index++) { 3047 Method* const m = methods->at(index); 3048 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3049 m->set_vtable_index(index); 3050 } 3051 } 3052 // Sort method array by ascending method name (for faster lookups & vtable construction) 3053 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3054 Method::sort_methods(methods); 3055 3056 intArray* method_ordering = NULL; 3057 // If JVMTI original method ordering or sharing is enabled construct int 3058 // array remembering the original ordering 3059 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3060 method_ordering = new intArray(length, length, -1); 3061 for (int index = 0; index < length; index++) { 3062 Method* const m = methods->at(index); 3063 const int old_index = m->vtable_index(); 3064 assert(old_index >= 0 && old_index < length, "invalid method index"); 3065 method_ordering->at_put(index, old_index); 3066 m->set_vtable_index(Method::invalid_vtable_index); 3067 } 3068 } 3069 return method_ordering; 3070 } 3071 3072 // Parse generic_signature attribute for methods and fields 3073 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3074 TRAPS) { 3075 assert(cfs != NULL, "invariant"); 3076 3077 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3078 const u2 generic_signature_index = cfs->get_u2_fast(); 3079 check_property( 3080 valid_symbol_at(generic_signature_index), 3081 "Invalid Signature attribute at constant pool index %u in class file %s", 3082 generic_signature_index, CHECK_0); 3083 return generic_signature_index; 3084 } 3085 3086 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3087 TRAPS) { 3088 3089 assert(cfs != NULL, "invariant"); 3090 3091 cfs->guarantee_more(2, CHECK); // sourcefile_index 3092 const u2 sourcefile_index = cfs->get_u2_fast(); 3093 check_property( 3094 valid_symbol_at(sourcefile_index), 3095 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3096 sourcefile_index, CHECK); 3097 set_class_sourcefile_index(sourcefile_index); 3098 } 3099 3100 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3101 int length, 3102 TRAPS) { 3103 assert(cfs != NULL, "invariant"); 3104 3105 const u1* const sde_buffer = cfs->current(); 3106 assert(sde_buffer != NULL, "null sde buffer"); 3107 3108 // Don't bother storing it if there is no way to retrieve it 3109 if (JvmtiExport::can_get_source_debug_extension()) { 3110 assert((length+1) > length, "Overflow checking"); 3111 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3112 for (int i = 0; i < length; i++) { 3113 sde[i] = sde_buffer[i]; 3114 } 3115 sde[length] = '\0'; 3116 set_class_sde_buffer((const char*)sde, length); 3117 } 3118 // Got utf8 string, set stream position forward 3119 cfs->skip_u1(length, CHECK); 3120 } 3121 3122 3123 // Inner classes can be static, private or protected (classic VM does this) 3124 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3125 JVM_ACC_PRIVATE | \ 3126 JVM_ACC_PROTECTED | \ 3127 JVM_ACC_STATIC \ 3128 ) 3129 3130 // Return number of classes in the inner classes attribute table 3131 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3132 const u1* const inner_classes_attribute_start, 3133 bool parsed_enclosingmethod_attribute, 3134 u2 enclosing_method_class_index, 3135 u2 enclosing_method_method_index, 3136 TRAPS) { 3137 const u1* const current_mark = cfs->current(); 3138 u2 length = 0; 3139 if (inner_classes_attribute_start != NULL) { 3140 cfs->set_current(inner_classes_attribute_start); 3141 cfs->guarantee_more(2, CHECK_0); // length 3142 length = cfs->get_u2_fast(); 3143 } 3144 3145 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3146 // method data: 3147 // [inner_class_info_index, 3148 // outer_class_info_index, 3149 // inner_name_index, 3150 // inner_class_access_flags, 3151 // ... 3152 // enclosing_method_class_index, 3153 // enclosing_method_method_index] 3154 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3155 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3156 _inner_classes = inner_classes; 3157 3158 int index = 0; 3159 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3160 for (int n = 0; n < length; n++) { 3161 // Inner class index 3162 const u2 inner_class_info_index = cfs->get_u2_fast(); 3163 check_property( 3164 valid_klass_reference_at(inner_class_info_index), 3165 "inner_class_info_index %u has bad constant type in class file %s", 3166 inner_class_info_index, CHECK_0); 3167 // Outer class index 3168 const u2 outer_class_info_index = cfs->get_u2_fast(); 3169 check_property( 3170 outer_class_info_index == 0 || 3171 valid_klass_reference_at(outer_class_info_index), 3172 "outer_class_info_index %u has bad constant type in class file %s", 3173 outer_class_info_index, CHECK_0); 3174 // Inner class name 3175 const u2 inner_name_index = cfs->get_u2_fast(); 3176 check_property( 3177 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3178 "inner_name_index %u has bad constant type in class file %s", 3179 inner_name_index, CHECK_0); 3180 if (_need_verify) { 3181 guarantee_property(inner_class_info_index != outer_class_info_index, 3182 "Class is both outer and inner class in class file %s", CHECK_0); 3183 } 3184 // Access flags 3185 jint flags; 3186 // JVM_ACC_MODULE is defined in JDK-9 and later. 3187 if (_major_version >= JAVA_9_VERSION) { 3188 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3189 } else { 3190 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3191 } 3192 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3193 // Set abstract bit for old class files for backward compatibility 3194 flags |= JVM_ACC_ABSTRACT; 3195 } 3196 verify_legal_class_modifiers(flags, CHECK_0); 3197 AccessFlags inner_access_flags(flags); 3198 3199 inner_classes->at_put(index++, inner_class_info_index); 3200 inner_classes->at_put(index++, outer_class_info_index); 3201 inner_classes->at_put(index++, inner_name_index); 3202 inner_classes->at_put(index++, inner_access_flags.as_short()); 3203 } 3204 3205 // 4347400: make sure there's no duplicate entry in the classes array 3206 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3207 for(int i = 0; i < length * 4; i += 4) { 3208 for(int j = i + 4; j < length * 4; j += 4) { 3209 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3210 inner_classes->at(i+1) != inner_classes->at(j+1) || 3211 inner_classes->at(i+2) != inner_classes->at(j+2) || 3212 inner_classes->at(i+3) != inner_classes->at(j+3)), 3213 "Duplicate entry in InnerClasses in class file %s", 3214 CHECK_0); 3215 } 3216 } 3217 } 3218 3219 // Set EnclosingMethod class and method indexes. 3220 if (parsed_enclosingmethod_attribute) { 3221 inner_classes->at_put(index++, enclosing_method_class_index); 3222 inner_classes->at_put(index++, enclosing_method_method_index); 3223 } 3224 assert(index == size, "wrong size"); 3225 3226 // Restore buffer's current position. 3227 cfs->set_current(current_mark); 3228 3229 return length; 3230 } 3231 3232 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, 3233 const u1* const nest_members_attribute_start, 3234 TRAPS) { 3235 const u1* const current_mark = cfs->current(); 3236 u2 length = 0; 3237 if (nest_members_attribute_start != NULL) { 3238 cfs->set_current(nest_members_attribute_start); 3239 cfs->guarantee_more(2, CHECK_0); // length 3240 length = cfs->get_u2_fast(); 3241 } 3242 const int size = length; 3243 Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3244 _nest_members = nest_members; 3245 3246 int index = 0; 3247 cfs->guarantee_more(2 * length, CHECK_0); 3248 for (int n = 0; n < length; n++) { 3249 const u2 class_info_index = cfs->get_u2_fast(); 3250 check_property( 3251 valid_klass_reference_at(class_info_index), 3252 "Nest member class_info_index %u has bad constant type in class file %s", 3253 class_info_index, CHECK_0); 3254 nest_members->at_put(index++, class_info_index); 3255 } 3256 assert(index == size, "wrong size"); 3257 3258 // Restore buffer's current position. 3259 cfs->set_current(current_mark); 3260 3261 return length; 3262 } 3263 3264 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3265 set_class_synthetic_flag(true); 3266 } 3267 3268 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3269 assert(cfs != NULL, "invariant"); 3270 3271 const u2 signature_index = cfs->get_u2(CHECK); 3272 check_property( 3273 valid_symbol_at(signature_index), 3274 "Invalid constant pool index %u in Signature attribute in class file %s", 3275 signature_index, CHECK); 3276 set_class_generic_signature_index(signature_index); 3277 } 3278 3279 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3280 ConstantPool* cp, 3281 u4 attribute_byte_length, 3282 TRAPS) { 3283 assert(cfs != NULL, "invariant"); 3284 assert(cp != NULL, "invariant"); 3285 3286 const u1* const current_start = cfs->current(); 3287 3288 guarantee_property(attribute_byte_length >= sizeof(u2), 3289 "Invalid BootstrapMethods attribute length %u in class file %s", 3290 attribute_byte_length, 3291 CHECK); 3292 3293 cfs->guarantee_more(attribute_byte_length, CHECK); 3294 3295 const int attribute_array_length = cfs->get_u2_fast(); 3296 3297 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3298 "Short length on BootstrapMethods in class file %s", 3299 CHECK); 3300 3301 3302 // The attribute contains a counted array of counted tuples of shorts, 3303 // represending bootstrap specifiers: 3304 // length*{bootstrap_method_index, argument_count*{argument_index}} 3305 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3306 // operand_count = number of shorts in attr, except for leading length 3307 3308 // The attribute is copied into a short[] array. 3309 // The array begins with a series of short[2] pairs, one for each tuple. 3310 const int index_size = (attribute_array_length * 2); 3311 3312 Array<u2>* const operands = 3313 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3314 3315 // Eagerly assign operands so they will be deallocated with the constant 3316 // pool if there is an error. 3317 cp->set_operands(operands); 3318 3319 int operand_fill_index = index_size; 3320 const int cp_size = cp->length(); 3321 3322 for (int n = 0; n < attribute_array_length; n++) { 3323 // Store a 32-bit offset into the header of the operand array. 3324 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3325 3326 // Read a bootstrap specifier. 3327 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3328 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3329 const u2 argument_count = cfs->get_u2_fast(); 3330 check_property( 3331 valid_cp_range(bootstrap_method_index, cp_size) && 3332 cp->tag_at(bootstrap_method_index).is_method_handle(), 3333 "bootstrap_method_index %u has bad constant type in class file %s", 3334 bootstrap_method_index, 3335 CHECK); 3336 3337 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3338 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3339 CHECK); 3340 3341 operands->at_put(operand_fill_index++, bootstrap_method_index); 3342 operands->at_put(operand_fill_index++, argument_count); 3343 3344 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3345 for (int j = 0; j < argument_count; j++) { 3346 const u2 argument_index = cfs->get_u2_fast(); 3347 check_property( 3348 valid_cp_range(argument_index, cp_size) && 3349 cp->tag_at(argument_index).is_loadable_constant(), 3350 "argument_index %u has bad constant type in class file %s", 3351 argument_index, 3352 CHECK); 3353 operands->at_put(operand_fill_index++, argument_index); 3354 } 3355 } 3356 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3357 "Bad length on BootstrapMethods in class file %s", 3358 CHECK); 3359 } 3360 3361 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3362 ConstantPool* cp, 3363 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3364 TRAPS) { 3365 assert(cfs != NULL, "invariant"); 3366 assert(cp != NULL, "invariant"); 3367 assert(parsed_annotations != NULL, "invariant"); 3368 3369 // Set inner classes attribute to default sentinel 3370 _inner_classes = Universe::the_empty_short_array(); 3371 // Set nest members attribute to default sentinel 3372 _nest_members = Universe::the_empty_short_array(); 3373 cfs->guarantee_more(2, CHECK); // attributes_count 3374 u2 attributes_count = cfs->get_u2_fast(); 3375 bool parsed_sourcefile_attribute = false; 3376 bool parsed_innerclasses_attribute = false; 3377 bool parsed_nest_members_attribute = false; 3378 bool parsed_nest_host_attribute = false; 3379 bool parsed_enclosingmethod_attribute = false; 3380 bool parsed_bootstrap_methods_attribute = false; 3381 const u1* runtime_visible_annotations = NULL; 3382 int runtime_visible_annotations_length = 0; 3383 const u1* runtime_invisible_annotations = NULL; 3384 int runtime_invisible_annotations_length = 0; 3385 const u1* runtime_visible_type_annotations = NULL; 3386 int runtime_visible_type_annotations_length = 0; 3387 const u1* runtime_invisible_type_annotations = NULL; 3388 int runtime_invisible_type_annotations_length = 0; 3389 bool runtime_invisible_type_annotations_exists = false; 3390 bool runtime_invisible_annotations_exists = false; 3391 bool parsed_source_debug_ext_annotations_exist = false; 3392 const u1* inner_classes_attribute_start = NULL; 3393 u4 inner_classes_attribute_length = 0; 3394 u2 enclosing_method_class_index = 0; 3395 u2 enclosing_method_method_index = 0; 3396 const u1* nest_members_attribute_start = NULL; 3397 u4 nest_members_attribute_length = 0; 3398 3399 // Iterate over attributes 3400 while (attributes_count--) { 3401 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3402 const u2 attribute_name_index = cfs->get_u2_fast(); 3403 const u4 attribute_length = cfs->get_u4_fast(); 3404 check_property( 3405 valid_symbol_at(attribute_name_index), 3406 "Attribute name has bad constant pool index %u in class file %s", 3407 attribute_name_index, CHECK); 3408 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3409 if (tag == vmSymbols::tag_source_file()) { 3410 // Check for SourceFile tag 3411 if (_need_verify) { 3412 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3413 } 3414 if (parsed_sourcefile_attribute) { 3415 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3416 } else { 3417 parsed_sourcefile_attribute = true; 3418 } 3419 parse_classfile_sourcefile_attribute(cfs, CHECK); 3420 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3421 // Check for SourceDebugExtension tag 3422 if (parsed_source_debug_ext_annotations_exist) { 3423 classfile_parse_error( 3424 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3425 } 3426 parsed_source_debug_ext_annotations_exist = true; 3427 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3428 } else if (tag == vmSymbols::tag_inner_classes()) { 3429 // Check for InnerClasses tag 3430 if (parsed_innerclasses_attribute) { 3431 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3432 } else { 3433 parsed_innerclasses_attribute = true; 3434 } 3435 inner_classes_attribute_start = cfs->current(); 3436 inner_classes_attribute_length = attribute_length; 3437 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3438 } else if (tag == vmSymbols::tag_synthetic()) { 3439 // Check for Synthetic tag 3440 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3441 if (attribute_length != 0) { 3442 classfile_parse_error( 3443 "Invalid Synthetic classfile attribute length %u in class file %s", 3444 attribute_length, CHECK); 3445 } 3446 parse_classfile_synthetic_attribute(CHECK); 3447 } else if (tag == vmSymbols::tag_deprecated()) { 3448 // Check for Deprecatd tag - 4276120 3449 if (attribute_length != 0) { 3450 classfile_parse_error( 3451 "Invalid Deprecated classfile attribute length %u in class file %s", 3452 attribute_length, CHECK); 3453 } 3454 } else if (_major_version >= JAVA_1_5_VERSION) { 3455 if (tag == vmSymbols::tag_signature()) { 3456 if (_generic_signature_index != 0) { 3457 classfile_parse_error( 3458 "Multiple Signature attributes in class file %s", CHECK); 3459 } 3460 if (attribute_length != 2) { 3461 classfile_parse_error( 3462 "Wrong Signature attribute length %u in class file %s", 3463 attribute_length, CHECK); 3464 } 3465 parse_classfile_signature_attribute(cfs, CHECK); 3466 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3467 if (runtime_visible_annotations != NULL) { 3468 classfile_parse_error( 3469 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3470 } 3471 runtime_visible_annotations_length = attribute_length; 3472 runtime_visible_annotations = cfs->current(); 3473 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3474 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3475 parse_annotations(cp, 3476 runtime_visible_annotations, 3477 runtime_visible_annotations_length, 3478 parsed_annotations, 3479 _loader_data, 3480 CHECK); 3481 cfs->skip_u1_fast(runtime_visible_annotations_length); 3482 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3483 if (runtime_invisible_annotations_exists) { 3484 classfile_parse_error( 3485 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3486 } 3487 runtime_invisible_annotations_exists = true; 3488 if (PreserveAllAnnotations) { 3489 runtime_invisible_annotations_length = attribute_length; 3490 runtime_invisible_annotations = cfs->current(); 3491 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3492 } 3493 cfs->skip_u1(attribute_length, CHECK); 3494 } else if (tag == vmSymbols::tag_enclosing_method()) { 3495 if (parsed_enclosingmethod_attribute) { 3496 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3497 } else { 3498 parsed_enclosingmethod_attribute = true; 3499 } 3500 guarantee_property(attribute_length == 4, 3501 "Wrong EnclosingMethod attribute length %u in class file %s", 3502 attribute_length, CHECK); 3503 cfs->guarantee_more(4, CHECK); // class_index, method_index 3504 enclosing_method_class_index = cfs->get_u2_fast(); 3505 enclosing_method_method_index = cfs->get_u2_fast(); 3506 if (enclosing_method_class_index == 0) { 3507 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3508 } 3509 // Validate the constant pool indices and types 3510 check_property(valid_klass_reference_at(enclosing_method_class_index), 3511 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3512 if (enclosing_method_method_index != 0 && 3513 (!cp->is_within_bounds(enclosing_method_method_index) || 3514 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3515 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3516 } 3517 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3518 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3519 if (parsed_bootstrap_methods_attribute) { 3520 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3521 } 3522 parsed_bootstrap_methods_attribute = true; 3523 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3524 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3525 if (runtime_visible_type_annotations != NULL) { 3526 classfile_parse_error( 3527 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3528 } 3529 runtime_visible_type_annotations_length = attribute_length; 3530 runtime_visible_type_annotations = cfs->current(); 3531 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3532 // No need for the VM to parse Type annotations 3533 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3534 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3535 if (runtime_invisible_type_annotations_exists) { 3536 classfile_parse_error( 3537 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3538 } else { 3539 runtime_invisible_type_annotations_exists = true; 3540 } 3541 if (PreserveAllAnnotations) { 3542 runtime_invisible_type_annotations_length = attribute_length; 3543 runtime_invisible_type_annotations = cfs->current(); 3544 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3545 } 3546 cfs->skip_u1(attribute_length, CHECK); 3547 } else if (_major_version >= JAVA_11_VERSION) { 3548 if (tag == vmSymbols::tag_nest_members()) { 3549 // Check for NestMembers tag 3550 if (parsed_nest_members_attribute) { 3551 classfile_parse_error("Multiple NestMembers attributes in class file %s", CHECK); 3552 } else { 3553 parsed_nest_members_attribute = true; 3554 } 3555 if (parsed_nest_host_attribute) { 3556 classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", CHECK); 3557 } 3558 nest_members_attribute_start = cfs->current(); 3559 nest_members_attribute_length = attribute_length; 3560 cfs->skip_u1(nest_members_attribute_length, CHECK); 3561 } else if (tag == vmSymbols::tag_nest_host()) { 3562 if (parsed_nest_host_attribute) { 3563 classfile_parse_error("Multiple NestHost attributes in class file %s", CHECK); 3564 } else { 3565 parsed_nest_host_attribute = true; 3566 } 3567 if (parsed_nest_members_attribute) { 3568 classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", CHECK); 3569 } 3570 if (_need_verify) { 3571 guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); 3572 } 3573 cfs->guarantee_more(2, CHECK); 3574 u2 class_info_index = cfs->get_u2_fast(); 3575 check_property( 3576 valid_klass_reference_at(class_info_index), 3577 "Nest-host class_info_index %u has bad constant type in class file %s", 3578 class_info_index, CHECK); 3579 _nest_host = class_info_index; 3580 } else { 3581 // Unknown attribute 3582 cfs->skip_u1(attribute_length, CHECK); 3583 } 3584 } else { 3585 // Unknown attribute 3586 cfs->skip_u1(attribute_length, CHECK); 3587 } 3588 } else { 3589 // Unknown attribute 3590 cfs->skip_u1(attribute_length, CHECK); 3591 } 3592 } 3593 _annotations = assemble_annotations(runtime_visible_annotations, 3594 runtime_visible_annotations_length, 3595 runtime_invisible_annotations, 3596 runtime_invisible_annotations_length, 3597 CHECK); 3598 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3599 runtime_visible_type_annotations_length, 3600 runtime_invisible_type_annotations, 3601 runtime_invisible_type_annotations_length, 3602 CHECK); 3603 3604 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3605 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3606 cfs, 3607 inner_classes_attribute_start, 3608 parsed_innerclasses_attribute, 3609 enclosing_method_class_index, 3610 enclosing_method_method_index, 3611 CHECK); 3612 if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { 3613 guarantee_property( 3614 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3615 "Wrong InnerClasses attribute length in class file %s", CHECK); 3616 } 3617 } 3618 3619 if (parsed_nest_members_attribute) { 3620 const u2 num_of_classes = parse_classfile_nest_members_attribute( 3621 cfs, 3622 nest_members_attribute_start, 3623 CHECK); 3624 if (_need_verify) { 3625 guarantee_property( 3626 nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, 3627 "Wrong NestMembers attribute length in class file %s", CHECK); 3628 } 3629 } 3630 3631 if (_max_bootstrap_specifier_index >= 0) { 3632 guarantee_property(parsed_bootstrap_methods_attribute, 3633 "Missing BootstrapMethods attribute in class file %s", CHECK); 3634 } 3635 } 3636 3637 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3638 assert(k != NULL, "invariant"); 3639 3640 if (_synthetic_flag) 3641 k->set_is_synthetic(); 3642 if (_sourcefile_index != 0) { 3643 k->set_source_file_name_index(_sourcefile_index); 3644 } 3645 if (_generic_signature_index != 0) { 3646 k->set_generic_signature_index(_generic_signature_index); 3647 } 3648 if (_sde_buffer != NULL) { 3649 k->set_source_debug_extension(_sde_buffer, _sde_length); 3650 } 3651 } 3652 3653 // Create the Annotations object that will 3654 // hold the annotations array for the Klass. 3655 void ClassFileParser::create_combined_annotations(TRAPS) { 3656 if (_annotations == NULL && 3657 _type_annotations == NULL && 3658 _fields_annotations == NULL && 3659 _fields_type_annotations == NULL) { 3660 // Don't create the Annotations object unnecessarily. 3661 return; 3662 } 3663 3664 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3665 annotations->set_class_annotations(_annotations); 3666 annotations->set_class_type_annotations(_type_annotations); 3667 annotations->set_fields_annotations(_fields_annotations); 3668 annotations->set_fields_type_annotations(_fields_type_annotations); 3669 3670 // This is the Annotations object that will be 3671 // assigned to InstanceKlass being constructed. 3672 _combined_annotations = annotations; 3673 3674 // The annotations arrays below has been transfered the 3675 // _combined_annotations so these fields can now be cleared. 3676 _annotations = NULL; 3677 _type_annotations = NULL; 3678 _fields_annotations = NULL; 3679 _fields_type_annotations = NULL; 3680 } 3681 3682 // Transfer ownership of metadata allocated to the InstanceKlass. 3683 void ClassFileParser::apply_parsed_class_metadata( 3684 InstanceKlass* this_klass, 3685 int java_fields_count, TRAPS) { 3686 assert(this_klass != NULL, "invariant"); 3687 3688 _cp->set_pool_holder(this_klass); 3689 this_klass->set_constants(_cp); 3690 this_klass->set_fields(_fields, java_fields_count); 3691 this_klass->set_methods(_methods); 3692 this_klass->set_inner_classes(_inner_classes); 3693 this_klass->set_nest_members(_nest_members); 3694 this_klass->set_nest_host_index(_nest_host); 3695 this_klass->set_local_interfaces(_local_interfaces); 3696 this_klass->set_annotations(_combined_annotations); 3697 // Delay the setting of _transitive_interfaces until after initialize_supers() in 3698 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with 3699 // its _super. If an OOM occurs while loading the current klass, its _super field 3700 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3701 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3702 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3703 3704 // Clear out these fields so they don't get deallocated by the destructor 3705 clear_class_metadata(); 3706 } 3707 3708 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3709 int runtime_visible_annotations_length, 3710 const u1* const runtime_invisible_annotations, 3711 int runtime_invisible_annotations_length, 3712 TRAPS) { 3713 AnnotationArray* annotations = NULL; 3714 if (runtime_visible_annotations != NULL || 3715 runtime_invisible_annotations != NULL) { 3716 annotations = MetadataFactory::new_array<u1>(_loader_data, 3717 runtime_visible_annotations_length + 3718 runtime_invisible_annotations_length, 3719 CHECK_(annotations)); 3720 if (runtime_visible_annotations != NULL) { 3721 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3722 annotations->at_put(i, runtime_visible_annotations[i]); 3723 } 3724 } 3725 if (runtime_invisible_annotations != NULL) { 3726 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3727 int append = runtime_visible_annotations_length+i; 3728 annotations->at_put(append, runtime_invisible_annotations[i]); 3729 } 3730 } 3731 } 3732 return annotations; 3733 } 3734 3735 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3736 const int super_class_index, 3737 const bool need_verify, 3738 TRAPS) { 3739 assert(cp != NULL, "invariant"); 3740 const InstanceKlass* super_klass = NULL; 3741 3742 if (super_class_index == 0) { 3743 check_property(_class_name == vmSymbols::java_lang_Object(), 3744 "Invalid superclass index %u in class file %s", 3745 super_class_index, 3746 CHECK_NULL); 3747 } else { 3748 check_property(valid_klass_reference_at(super_class_index), 3749 "Invalid superclass index %u in class file %s", 3750 super_class_index, 3751 CHECK_NULL); 3752 // The class name should be legal because it is checked when parsing constant pool. 3753 // However, make sure it is not an array type. 3754 bool is_array = false; 3755 if (cp->tag_at(super_class_index).is_klass()) { 3756 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3757 if (need_verify) 3758 is_array = super_klass->is_array_klass(); 3759 } else if (need_verify) { 3760 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY); 3761 } 3762 if (need_verify) { 3763 guarantee_property(!is_array, 3764 "Bad superclass name in class file %s", CHECK_NULL); 3765 } 3766 } 3767 return super_klass; 3768 } 3769 3770 static unsigned int compute_oop_map_count(const InstanceKlass* super, 3771 unsigned int nonstatic_oop_map_count, 3772 int first_nonstatic_oop_offset) { 3773 3774 unsigned int map_count = 3775 NULL == super ? 0 : super->nonstatic_oop_map_count(); 3776 if (nonstatic_oop_map_count > 0) { 3777 // We have oops to add to map 3778 if (map_count == 0) { 3779 map_count = nonstatic_oop_map_count; 3780 } 3781 else { 3782 // Check whether we should add a new map block or whether the last one can 3783 // be extended 3784 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3785 const OopMapBlock* const last_map = first_map + map_count - 1; 3786 3787 const int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3788 if (next_offset == first_nonstatic_oop_offset) { 3789 // There is no gap bettwen superklass's last oop field and first 3790 // local oop field, merge maps. 3791 nonstatic_oop_map_count -= 1; 3792 } 3793 else { 3794 // Superklass didn't end with a oop field, add extra maps 3795 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3796 } 3797 map_count += nonstatic_oop_map_count; 3798 } 3799 } 3800 return map_count; 3801 } 3802 3803 #ifndef PRODUCT 3804 static void print_field_layout(const Symbol* name, 3805 Array<u2>* fields, 3806 const constantPoolHandle& cp, 3807 int instance_size, 3808 int instance_fields_start, 3809 int instance_fields_end, 3810 int static_fields_end) { 3811 3812 assert(name != NULL, "invariant"); 3813 3814 tty->print("%s: field layout\n", name->as_klass_external_name()); 3815 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3816 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3817 if (!fs.access_flags().is_static()) { 3818 tty->print(" @%3d \"%s\" %s\n", 3819 fs.offset(), 3820 fs.name()->as_klass_external_name(), 3821 fs.signature()->as_klass_external_name()); 3822 } 3823 } 3824 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3825 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3826 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3827 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3828 if (fs.access_flags().is_static()) { 3829 tty->print(" @%3d \"%s\" %s\n", 3830 fs.offset(), 3831 fs.name()->as_klass_external_name(), 3832 fs.signature()->as_klass_external_name()); 3833 } 3834 } 3835 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 3836 tty->print("\n"); 3837 } 3838 #endif 3839 3840 // Values needed for oopmap and InstanceKlass creation 3841 class ClassFileParser::FieldLayoutInfo : public ResourceObj { 3842 public: 3843 int* nonstatic_oop_offsets; 3844 unsigned int* nonstatic_oop_counts; 3845 unsigned int nonstatic_oop_map_count; 3846 unsigned int total_oop_map_count; 3847 int instance_size; 3848 int nonstatic_field_size; 3849 int static_field_size; 3850 bool has_nonstatic_fields; 3851 }; 3852 3853 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3854 void ClassFileParser::layout_fields(ConstantPool* cp, 3855 const FieldAllocationCount* fac, 3856 const ClassAnnotationCollector* parsed_annotations, 3857 FieldLayoutInfo* info, 3858 TRAPS) { 3859 3860 assert(cp != NULL, "invariant"); 3861 3862 // Field size and offset computation 3863 int nonstatic_field_size = _super_klass == NULL ? 0 : 3864 _super_klass->nonstatic_field_size(); 3865 3866 // Count the contended fields by type. 3867 // 3868 // We ignore static fields, because @Contended is not supported for them. 3869 // The layout code below will also ignore the static fields. 3870 int nonstatic_contended_count = 0; 3871 FieldAllocationCount fac_contended; 3872 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 3873 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3874 if (fs.is_contended()) { 3875 fac_contended.count[atype]++; 3876 if (!fs.access_flags().is_static()) { 3877 nonstatic_contended_count++; 3878 } 3879 } 3880 } 3881 3882 3883 // Calculate the starting byte offsets 3884 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3885 int next_static_double_offset = next_static_oop_offset + 3886 ((fac->count[STATIC_OOP]) * heapOopSize); 3887 if (fac->count[STATIC_DOUBLE]) { 3888 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 3889 } 3890 3891 int next_static_word_offset = next_static_double_offset + 3892 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3893 int next_static_short_offset = next_static_word_offset + 3894 ((fac->count[STATIC_WORD]) * BytesPerInt); 3895 int next_static_byte_offset = next_static_short_offset + 3896 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3897 3898 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3899 nonstatic_field_size * heapOopSize; 3900 3901 int next_nonstatic_field_offset = nonstatic_fields_start; 3902 3903 const bool is_contended_class = parsed_annotations->is_contended(); 3904 3905 // Class is contended, pad before all the fields 3906 if (is_contended_class) { 3907 next_nonstatic_field_offset += ContendedPaddingWidth; 3908 } 3909 3910 // Compute the non-contended fields count. 3911 // The packing code below relies on these counts to determine if some field 3912 // can be squeezed into the alignment gap. Contended fields are obviously 3913 // exempt from that. 3914 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3915 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3916 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3917 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3918 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3919 3920 // Total non-static fields count, including every contended field 3921 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3922 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3923 fac->count[NONSTATIC_OOP]; 3924 3925 const bool super_has_nonstatic_fields = 3926 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 3927 const bool has_nonstatic_fields = 3928 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3929 3930 3931 // Prepare list of oops for oop map generation. 3932 // 3933 // "offset" and "count" lists are describing the set of contiguous oop 3934 // regions. offset[i] is the start of the i-th region, which then has 3935 // count[i] oops following. Before we know how many regions are required, 3936 // we pessimistically allocate the maps to fit all the oops into the 3937 // distinct regions. 3938 // 3939 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3940 // to figure out if we still need to do this. 3941 unsigned int nonstatic_oop_map_count = 0; 3942 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3943 3944 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3945 THREAD, int, max_nonstatic_oop_maps); 3946 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3947 THREAD, unsigned int, max_nonstatic_oop_maps); 3948 3949 int first_nonstatic_oop_offset = 0; // will be set for first oop field 3950 3951 bool compact_fields = CompactFields; 3952 int allocation_style = FieldsAllocationStyle; 3953 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3954 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3955 allocation_style = 1; // Optimistic 3956 } 3957 3958 // The next classes have predefined hard-coded fields offsets 3959 // (see in JavaClasses::compute_hard_coded_offsets()). 3960 // Use default fields allocation order for them. 3961 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL && 3962 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3963 _class_name == vmSymbols::java_lang_Class() || 3964 _class_name == vmSymbols::java_lang_ClassLoader() || 3965 _class_name == vmSymbols::java_lang_ref_Reference() || 3966 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3967 _class_name == vmSymbols::java_lang_StackTraceElement() || 3968 _class_name == vmSymbols::java_lang_String() || 3969 _class_name == vmSymbols::java_lang_Throwable() || 3970 _class_name == vmSymbols::java_lang_Boolean() || 3971 _class_name == vmSymbols::java_lang_Character() || 3972 _class_name == vmSymbols::java_lang_Float() || 3973 _class_name == vmSymbols::java_lang_Double() || 3974 _class_name == vmSymbols::java_lang_Byte() || 3975 _class_name == vmSymbols::java_lang_Short() || 3976 _class_name == vmSymbols::java_lang_Integer() || 3977 _class_name == vmSymbols::java_lang_Long())) { 3978 allocation_style = 0; // Allocate oops first 3979 compact_fields = false; // Don't compact fields 3980 } 3981 3982 int next_nonstatic_oop_offset = 0; 3983 int next_nonstatic_double_offset = 0; 3984 3985 // Rearrange fields for a given allocation style 3986 if( allocation_style == 0 ) { 3987 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3988 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3989 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3990 (nonstatic_oop_count * heapOopSize); 3991 } else if( allocation_style == 1 ) { 3992 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3993 next_nonstatic_double_offset = next_nonstatic_field_offset; 3994 } else if( allocation_style == 2 ) { 3995 // Fields allocation: oops fields in super and sub classes are together. 3996 if( nonstatic_field_size > 0 && _super_klass != NULL && 3997 _super_klass->nonstatic_oop_map_size() > 0 ) { 3998 const unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3999 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps(); 4000 const OopMapBlock* const last_map = first_map + map_count - 1; 4001 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 4002 if (next_offset == next_nonstatic_field_offset) { 4003 allocation_style = 0; // allocate oops first 4004 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4005 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4006 (nonstatic_oop_count * heapOopSize); 4007 } 4008 } 4009 if( allocation_style == 2 ) { 4010 allocation_style = 1; // allocate oops last 4011 next_nonstatic_double_offset = next_nonstatic_field_offset; 4012 } 4013 } else { 4014 ShouldNotReachHere(); 4015 } 4016 4017 int nonstatic_oop_space_count = 0; 4018 int nonstatic_word_space_count = 0; 4019 int nonstatic_short_space_count = 0; 4020 int nonstatic_byte_space_count = 0; 4021 int nonstatic_oop_space_offset = 0; 4022 int nonstatic_word_space_offset = 0; 4023 int nonstatic_short_space_offset = 0; 4024 int nonstatic_byte_space_offset = 0; 4025 4026 // Try to squeeze some of the fields into the gaps due to 4027 // long/double alignment. 4028 if (nonstatic_double_count > 0) { 4029 int offset = next_nonstatic_double_offset; 4030 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 4031 if (compact_fields && offset != next_nonstatic_double_offset) { 4032 // Allocate available fields into the gap before double field. 4033 int length = next_nonstatic_double_offset - offset; 4034 assert(length == BytesPerInt, ""); 4035 nonstatic_word_space_offset = offset; 4036 if (nonstatic_word_count > 0) { 4037 nonstatic_word_count -= 1; 4038 nonstatic_word_space_count = 1; // Only one will fit 4039 length -= BytesPerInt; 4040 offset += BytesPerInt; 4041 } 4042 nonstatic_short_space_offset = offset; 4043 while (length >= BytesPerShort && nonstatic_short_count > 0) { 4044 nonstatic_short_count -= 1; 4045 nonstatic_short_space_count += 1; 4046 length -= BytesPerShort; 4047 offset += BytesPerShort; 4048 } 4049 nonstatic_byte_space_offset = offset; 4050 while (length > 0 && nonstatic_byte_count > 0) { 4051 nonstatic_byte_count -= 1; 4052 nonstatic_byte_space_count += 1; 4053 length -= 1; 4054 } 4055 // Allocate oop field in the gap if there are no other fields for that. 4056 nonstatic_oop_space_offset = offset; 4057 if (length >= heapOopSize && nonstatic_oop_count > 0 && 4058 allocation_style != 0) { // when oop fields not first 4059 nonstatic_oop_count -= 1; 4060 nonstatic_oop_space_count = 1; // Only one will fit 4061 length -= heapOopSize; 4062 offset += heapOopSize; 4063 } 4064 } 4065 } 4066 4067 int next_nonstatic_word_offset = next_nonstatic_double_offset + 4068 (nonstatic_double_count * BytesPerLong); 4069 int next_nonstatic_short_offset = next_nonstatic_word_offset + 4070 (nonstatic_word_count * BytesPerInt); 4071 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 4072 (nonstatic_short_count * BytesPerShort); 4073 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 4074 nonstatic_byte_count; 4075 4076 // let oops jump before padding with this allocation style 4077 if( allocation_style == 1 ) { 4078 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 4079 if( nonstatic_oop_count > 0 ) { 4080 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 4081 } 4082 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 4083 } 4084 4085 // Iterate over fields again and compute correct offsets. 4086 // The field allocation type was temporarily stored in the offset slot. 4087 // oop fields are located before non-oop fields (static and non-static). 4088 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4089 4090 // skip already laid out fields 4091 if (fs.is_offset_set()) continue; 4092 4093 // contended instance fields are handled below 4094 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 4095 4096 int real_offset = 0; 4097 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4098 4099 // pack the rest of the fields 4100 switch (atype) { 4101 case STATIC_OOP: 4102 real_offset = next_static_oop_offset; 4103 next_static_oop_offset += heapOopSize; 4104 break; 4105 case STATIC_BYTE: 4106 real_offset = next_static_byte_offset; 4107 next_static_byte_offset += 1; 4108 break; 4109 case STATIC_SHORT: 4110 real_offset = next_static_short_offset; 4111 next_static_short_offset += BytesPerShort; 4112 break; 4113 case STATIC_WORD: 4114 real_offset = next_static_word_offset; 4115 next_static_word_offset += BytesPerInt; 4116 break; 4117 case STATIC_DOUBLE: 4118 real_offset = next_static_double_offset; 4119 next_static_double_offset += BytesPerLong; 4120 break; 4121 case NONSTATIC_OOP: 4122 if( nonstatic_oop_space_count > 0 ) { 4123 real_offset = nonstatic_oop_space_offset; 4124 nonstatic_oop_space_offset += heapOopSize; 4125 nonstatic_oop_space_count -= 1; 4126 } else { 4127 real_offset = next_nonstatic_oop_offset; 4128 next_nonstatic_oop_offset += heapOopSize; 4129 } 4130 4131 // Record this oop in the oop maps 4132 if( nonstatic_oop_map_count > 0 && 4133 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4134 real_offset - 4135 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4136 heapOopSize ) { 4137 // This oop is adjacent to the previous one, add to current oop map 4138 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4139 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4140 } else { 4141 // This oop is not adjacent to the previous one, create new oop map 4142 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4143 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4144 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4145 nonstatic_oop_map_count += 1; 4146 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4147 first_nonstatic_oop_offset = real_offset; 4148 } 4149 } 4150 break; 4151 case NONSTATIC_BYTE: 4152 if( nonstatic_byte_space_count > 0 ) { 4153 real_offset = nonstatic_byte_space_offset; 4154 nonstatic_byte_space_offset += 1; 4155 nonstatic_byte_space_count -= 1; 4156 } else { 4157 real_offset = next_nonstatic_byte_offset; 4158 next_nonstatic_byte_offset += 1; 4159 } 4160 break; 4161 case NONSTATIC_SHORT: 4162 if( nonstatic_short_space_count > 0 ) { 4163 real_offset = nonstatic_short_space_offset; 4164 nonstatic_short_space_offset += BytesPerShort; 4165 nonstatic_short_space_count -= 1; 4166 } else { 4167 real_offset = next_nonstatic_short_offset; 4168 next_nonstatic_short_offset += BytesPerShort; 4169 } 4170 break; 4171 case NONSTATIC_WORD: 4172 if( nonstatic_word_space_count > 0 ) { 4173 real_offset = nonstatic_word_space_offset; 4174 nonstatic_word_space_offset += BytesPerInt; 4175 nonstatic_word_space_count -= 1; 4176 } else { 4177 real_offset = next_nonstatic_word_offset; 4178 next_nonstatic_word_offset += BytesPerInt; 4179 } 4180 break; 4181 case NONSTATIC_DOUBLE: 4182 real_offset = next_nonstatic_double_offset; 4183 next_nonstatic_double_offset += BytesPerLong; 4184 break; 4185 default: 4186 ShouldNotReachHere(); 4187 } 4188 fs.set_offset(real_offset); 4189 } 4190 4191 4192 // Handle the contended cases. 4193 // 4194 // Each contended field should not intersect the cache line with another contended field. 4195 // In the absence of alignment information, we end up with pessimistically separating 4196 // the fields with full-width padding. 4197 // 4198 // Additionally, this should not break alignment for the fields, so we round the alignment up 4199 // for each field. 4200 if (nonstatic_contended_count > 0) { 4201 4202 // if there is at least one contended field, we need to have pre-padding for them 4203 next_nonstatic_padded_offset += ContendedPaddingWidth; 4204 4205 // collect all contended groups 4206 ResourceBitMap bm(cp->size()); 4207 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4208 // skip already laid out fields 4209 if (fs.is_offset_set()) continue; 4210 4211 if (fs.is_contended()) { 4212 bm.set_bit(fs.contended_group()); 4213 } 4214 } 4215 4216 int current_group = -1; 4217 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4218 4219 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4220 4221 // skip already laid out fields 4222 if (fs.is_offset_set()) continue; 4223 4224 // skip non-contended fields and fields from different group 4225 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4226 4227 // handle statics below 4228 if (fs.access_flags().is_static()) continue; 4229 4230 int real_offset = 0; 4231 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4232 4233 switch (atype) { 4234 case NONSTATIC_BYTE: 4235 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4236 real_offset = next_nonstatic_padded_offset; 4237 next_nonstatic_padded_offset += 1; 4238 break; 4239 4240 case NONSTATIC_SHORT: 4241 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4242 real_offset = next_nonstatic_padded_offset; 4243 next_nonstatic_padded_offset += BytesPerShort; 4244 break; 4245 4246 case NONSTATIC_WORD: 4247 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4248 real_offset = next_nonstatic_padded_offset; 4249 next_nonstatic_padded_offset += BytesPerInt; 4250 break; 4251 4252 case NONSTATIC_DOUBLE: 4253 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4254 real_offset = next_nonstatic_padded_offset; 4255 next_nonstatic_padded_offset += BytesPerLong; 4256 break; 4257 4258 case NONSTATIC_OOP: 4259 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4260 real_offset = next_nonstatic_padded_offset; 4261 next_nonstatic_padded_offset += heapOopSize; 4262 4263 // Record this oop in the oop maps 4264 if( nonstatic_oop_map_count > 0 && 4265 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4266 real_offset - 4267 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4268 heapOopSize ) { 4269 // This oop is adjacent to the previous one, add to current oop map 4270 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4271 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4272 } else { 4273 // This oop is not adjacent to the previous one, create new oop map 4274 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4275 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4276 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4277 nonstatic_oop_map_count += 1; 4278 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4279 first_nonstatic_oop_offset = real_offset; 4280 } 4281 } 4282 break; 4283 4284 default: 4285 ShouldNotReachHere(); 4286 } 4287 4288 if (fs.contended_group() == 0) { 4289 // Contended group defines the equivalence class over the fields: 4290 // the fields within the same contended group are not inter-padded. 4291 // The only exception is default group, which does not incur the 4292 // equivalence, and so requires intra-padding. 4293 next_nonstatic_padded_offset += ContendedPaddingWidth; 4294 } 4295 4296 fs.set_offset(real_offset); 4297 } // for 4298 4299 // Start laying out the next group. 4300 // Note that this will effectively pad the last group in the back; 4301 // this is expected to alleviate memory contention effects for 4302 // subclass fields and/or adjacent object. 4303 // If this was the default group, the padding is already in place. 4304 if (current_group != 0) { 4305 next_nonstatic_padded_offset += ContendedPaddingWidth; 4306 } 4307 } 4308 4309 // handle static fields 4310 } 4311 4312 // Entire class is contended, pad in the back. 4313 // This helps to alleviate memory contention effects for subclass fields 4314 // and/or adjacent object. 4315 if (is_contended_class) { 4316 next_nonstatic_padded_offset += ContendedPaddingWidth; 4317 } 4318 4319 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4320 4321 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize); 4322 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4323 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4324 4325 int static_field_size = (static_fields_end - 4326 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4327 nonstatic_field_size = nonstatic_field_size + 4328 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4329 4330 int instance_size = align_object_size(instance_end / wordSize); 4331 4332 assert(instance_size == align_object_size(align_up( 4333 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 4334 wordSize) / wordSize), "consistent layout helper value"); 4335 4336 // Invariant: nonstatic_field end/start should only change if there are 4337 // nonstatic fields in the class, or if the class is contended. We compare 4338 // against the non-aligned value, so that end alignment will not fail the 4339 // assert without actually having the fields. 4340 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4341 is_contended_class || 4342 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4343 4344 // Number of non-static oop map blocks allocated at end of klass. 4345 const unsigned int total_oop_map_count = 4346 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 4347 first_nonstatic_oop_offset); 4348 4349 #ifndef PRODUCT 4350 if (PrintFieldLayout) { 4351 print_field_layout(_class_name, 4352 _fields, 4353 cp, 4354 instance_size, 4355 nonstatic_fields_start, 4356 nonstatic_fields_end, 4357 static_fields_end); 4358 } 4359 4360 #endif 4361 // Pass back information needed for InstanceKlass creation 4362 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 4363 info->nonstatic_oop_counts = nonstatic_oop_counts; 4364 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 4365 info->total_oop_map_count = total_oop_map_count; 4366 info->instance_size = instance_size; 4367 info->static_field_size = static_field_size; 4368 info->nonstatic_field_size = nonstatic_field_size; 4369 info->has_nonstatic_fields = has_nonstatic_fields; 4370 } 4371 4372 static void fill_oop_maps(const InstanceKlass* k, 4373 unsigned int nonstatic_oop_map_count, 4374 const int* nonstatic_oop_offsets, 4375 const unsigned int* nonstatic_oop_counts) { 4376 4377 assert(k != NULL, "invariant"); 4378 4379 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4380 const InstanceKlass* const super = k->superklass(); 4381 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4382 if (super_count > 0) { 4383 // Copy maps from superklass 4384 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4385 for (unsigned int i = 0; i < super_count; ++i) { 4386 *this_oop_map++ = *super_oop_map++; 4387 } 4388 } 4389 4390 if (nonstatic_oop_map_count > 0) { 4391 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4392 // The counts differ because there is no gap between superklass's last oop 4393 // field and the first local oop field. Extend the last oop map copied 4394 // from the superklass instead of creating new one. 4395 nonstatic_oop_map_count--; 4396 nonstatic_oop_offsets++; 4397 this_oop_map--; 4398 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4399 this_oop_map++; 4400 } 4401 4402 // Add new map blocks, fill them 4403 while (nonstatic_oop_map_count-- > 0) { 4404 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4405 this_oop_map->set_count(*nonstatic_oop_counts++); 4406 this_oop_map++; 4407 } 4408 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4409 this_oop_map, "sanity"); 4410 } 4411 } 4412 4413 4414 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4415 assert(ik != NULL, "invariant"); 4416 4417 const Klass* const super = ik->super(); 4418 4419 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4420 // in which case we don't have to register objects as finalizable 4421 if (!_has_empty_finalizer) { 4422 if (_has_finalizer || 4423 (super != NULL && super->has_finalizer())) { 4424 ik->set_has_finalizer(); 4425 } 4426 } 4427 4428 #ifdef ASSERT 4429 bool f = false; 4430 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4431 vmSymbols::void_method_signature()); 4432 if (m != NULL && !m->is_empty_method()) { 4433 f = true; 4434 } 4435 4436 // Spec doesn't prevent agent from redefinition of empty finalizer. 4437 // Despite the fact that it's generally bad idea and redefined finalizer 4438 // will not work as expected we shouldn't abort vm in this case 4439 if (!ik->has_redefined_this_or_super()) { 4440 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4441 } 4442 #endif 4443 4444 // Check if this klass supports the java.lang.Cloneable interface 4445 if (SystemDictionary::Cloneable_klass_loaded()) { 4446 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4447 ik->set_is_cloneable(); 4448 } 4449 } 4450 4451 // Check if this klass has a vanilla default constructor 4452 if (super == NULL) { 4453 // java.lang.Object has empty default constructor 4454 ik->set_has_vanilla_constructor(); 4455 } else { 4456 if (super->has_vanilla_constructor() && 4457 _has_vanilla_constructor) { 4458 ik->set_has_vanilla_constructor(); 4459 } 4460 #ifdef ASSERT 4461 bool v = false; 4462 if (super->has_vanilla_constructor()) { 4463 const Method* const constructor = 4464 ik->find_method(vmSymbols::object_initializer_name(), 4465 vmSymbols::void_method_signature()); 4466 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4467 v = true; 4468 } 4469 } 4470 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4471 #endif 4472 } 4473 4474 // If it cannot be fast-path allocated, set a bit in the layout helper. 4475 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4476 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4477 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4478 || ik->is_abstract() || ik->is_interface() 4479 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4480 || ik->size_helper() >= FastAllocateSizeLimit) { 4481 // Forbid fast-path allocation. 4482 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4483 ik->set_layout_helper(lh); 4484 } 4485 } 4486 4487 // Attach super classes and interface classes to class loader data 4488 static void record_defined_class_dependencies(const InstanceKlass* defined_klass, 4489 TRAPS) { 4490 assert(defined_klass != NULL, "invariant"); 4491 4492 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data(); 4493 if (defining_loader_data->is_the_null_class_loader_data()) { 4494 // Dependencies to null class loader data are implicit. 4495 return; 4496 } else { 4497 // add super class dependency 4498 Klass* const super = defined_klass->super(); 4499 if (super != NULL) { 4500 defining_loader_data->record_dependency(super); 4501 } 4502 4503 // add super interface dependencies 4504 const Array<InstanceKlass*>* const local_interfaces = defined_klass->local_interfaces(); 4505 if (local_interfaces != NULL) { 4506 const int length = local_interfaces->length(); 4507 for (int i = 0; i < length; i++) { 4508 defining_loader_data->record_dependency(local_interfaces->at(i)); 4509 } 4510 } 4511 } 4512 } 4513 4514 // utility methods for appending an array with check for duplicates 4515 4516 static void append_interfaces(GrowableArray<InstanceKlass*>* result, 4517 const Array<InstanceKlass*>* const ifs) { 4518 // iterate over new interfaces 4519 for (int i = 0; i < ifs->length(); i++) { 4520 InstanceKlass* const e = ifs->at(i); 4521 assert(e->is_klass() && e->is_interface(), "just checking"); 4522 // add new interface 4523 result->append_if_missing(e); 4524 } 4525 } 4526 4527 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super, 4528 Array<InstanceKlass*>* local_ifs, 4529 ClassLoaderData* loader_data, 4530 TRAPS) { 4531 assert(local_ifs != NULL, "invariant"); 4532 assert(loader_data != NULL, "invariant"); 4533 4534 // Compute maximum size for transitive interfaces 4535 int max_transitive_size = 0; 4536 int super_size = 0; 4537 // Add superclass transitive interfaces size 4538 if (super != NULL) { 4539 super_size = super->transitive_interfaces()->length(); 4540 max_transitive_size += super_size; 4541 } 4542 // Add local interfaces' super interfaces 4543 const int local_size = local_ifs->length(); 4544 for (int i = 0; i < local_size; i++) { 4545 InstanceKlass* const l = local_ifs->at(i); 4546 max_transitive_size += l->transitive_interfaces()->length(); 4547 } 4548 // Finally add local interfaces 4549 max_transitive_size += local_size; 4550 // Construct array 4551 if (max_transitive_size == 0) { 4552 // no interfaces, use canonicalized array 4553 return Universe::the_empty_instance_klass_array(); 4554 } else if (max_transitive_size == super_size) { 4555 // no new local interfaces added, share superklass' transitive interface array 4556 return super->transitive_interfaces(); 4557 } else if (max_transitive_size == local_size) { 4558 // only local interfaces added, share local interface array 4559 return local_ifs; 4560 } else { 4561 ResourceMark rm; 4562 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size); 4563 4564 // Copy down from superclass 4565 if (super != NULL) { 4566 append_interfaces(result, super->transitive_interfaces()); 4567 } 4568 4569 // Copy down from local interfaces' superinterfaces 4570 for (int i = 0; i < local_size; i++) { 4571 InstanceKlass* const l = local_ifs->at(i); 4572 append_interfaces(result, l->transitive_interfaces()); 4573 } 4574 // Finally add local interfaces 4575 append_interfaces(result, local_ifs); 4576 4577 // length will be less than the max_transitive_size if duplicates were removed 4578 const int length = result->length(); 4579 assert(length <= max_transitive_size, "just checking"); 4580 Array<InstanceKlass*>* const new_result = 4581 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL); 4582 for (int i = 0; i < length; i++) { 4583 InstanceKlass* const e = result->at(i); 4584 assert(e != NULL, "just checking"); 4585 new_result->at_put(i, e); 4586 } 4587 return new_result; 4588 } 4589 } 4590 4591 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4592 assert(this_klass != NULL, "invariant"); 4593 const Klass* const super = this_klass->super(); 4594 if (super != NULL) { 4595 4596 // If the loader is not the boot loader then throw an exception if its 4597 // superclass is in package jdk.internal.reflect and its loader is not a 4598 // special reflection class loader 4599 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4600 assert(super->is_instance_klass(), "super is not instance klass"); 4601 PackageEntry* super_package = super->package(); 4602 if (super_package != NULL && 4603 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4604 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4605 ResourceMark rm(THREAD); 4606 Exceptions::fthrow( 4607 THREAD_AND_LOCATION, 4608 vmSymbols::java_lang_IllegalAccessError(), 4609 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4610 this_klass->external_name(), 4611 this_klass->class_loader_data()->loader_name_and_id(), 4612 super->external_name()); 4613 return; 4614 } 4615 } 4616 4617 Reflection::VerifyClassAccessResults vca_result = 4618 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4619 if (vca_result != Reflection::ACCESS_OK) { 4620 ResourceMark rm(THREAD); 4621 char* msg = Reflection::verify_class_access_msg(this_klass, 4622 InstanceKlass::cast(super), 4623 vca_result); 4624 if (msg == NULL) { 4625 bool same_module = (this_klass->module() == super->module()); 4626 Exceptions::fthrow( 4627 THREAD_AND_LOCATION, 4628 vmSymbols::java_lang_IllegalAccessError(), 4629 "class %s cannot access its %ssuperclass %s (%s%s%s)", 4630 this_klass->external_name(), 4631 super->is_abstract() ? "abstract " : "", 4632 super->external_name(), 4633 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), 4634 (same_module) ? "" : "; ", 4635 (same_module) ? "" : super->class_in_module_of_loader()); 4636 } else { 4637 // Add additional message content. 4638 Exceptions::fthrow( 4639 THREAD_AND_LOCATION, 4640 vmSymbols::java_lang_IllegalAccessError(), 4641 "superclass access check failed: %s", 4642 msg); 4643 } 4644 } 4645 } 4646 } 4647 4648 4649 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4650 assert(this_klass != NULL, "invariant"); 4651 const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces(); 4652 const int lng = local_interfaces->length(); 4653 for (int i = lng - 1; i >= 0; i--) { 4654 InstanceKlass* const k = local_interfaces->at(i); 4655 assert (k != NULL && k->is_interface(), "invalid interface"); 4656 Reflection::VerifyClassAccessResults vca_result = 4657 Reflection::verify_class_access(this_klass, k, false); 4658 if (vca_result != Reflection::ACCESS_OK) { 4659 ResourceMark rm(THREAD); 4660 char* msg = Reflection::verify_class_access_msg(this_klass, 4661 k, 4662 vca_result); 4663 if (msg == NULL) { 4664 bool same_module = (this_klass->module() == k->module()); 4665 Exceptions::fthrow( 4666 THREAD_AND_LOCATION, 4667 vmSymbols::java_lang_IllegalAccessError(), 4668 "class %s cannot access its superinterface %s (%s%s%s)", 4669 this_klass->external_name(), 4670 k->external_name(), 4671 (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), 4672 (same_module) ? "" : "; ", 4673 (same_module) ? "" : k->class_in_module_of_loader()); 4674 } else { 4675 // Add additional message content. 4676 Exceptions::fthrow( 4677 THREAD_AND_LOCATION, 4678 vmSymbols::java_lang_IllegalAccessError(), 4679 "superinterface check failed: %s", 4680 msg); 4681 } 4682 } 4683 } 4684 } 4685 4686 4687 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4688 assert(this_klass != NULL, "invariant"); 4689 const Array<Method*>* const methods = this_klass->methods(); 4690 const int num_methods = methods->length(); 4691 4692 // go thru each method and check if it overrides a final method 4693 for (int index = 0; index < num_methods; index++) { 4694 const Method* const m = methods->at(index); 4695 4696 // skip private, static, and <init> methods 4697 if ((!m->is_private() && !m->is_static()) && 4698 (m->name() != vmSymbols::object_initializer_name())) { 4699 4700 const Symbol* const name = m->name(); 4701 const Symbol* const signature = m->signature(); 4702 const Klass* k = this_klass->super(); 4703 const Method* super_m = NULL; 4704 while (k != NULL) { 4705 // skip supers that don't have final methods. 4706 if (k->has_final_method()) { 4707 // lookup a matching method in the super class hierarchy 4708 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4709 if (super_m == NULL) { 4710 break; // didn't find any match; get out 4711 } 4712 4713 if (super_m->is_final() && !super_m->is_static() && 4714 !super_m->access_flags().is_private()) { 4715 // matching method in super is final, and not static or private 4716 bool can_access = Reflection::verify_member_access(this_klass, 4717 super_m->method_holder(), 4718 super_m->method_holder(), 4719 super_m->access_flags(), 4720 false, false, CHECK); 4721 if (can_access) { 4722 // this class can access super final method and therefore override 4723 ResourceMark rm(THREAD); 4724 Exceptions::fthrow(THREAD_AND_LOCATION, 4725 vmSymbols::java_lang_VerifyError(), 4726 "class %s overrides final method %s.%s%s", 4727 this_klass->external_name(), 4728 super_m->method_holder()->external_name(), 4729 name->as_C_string(), 4730 signature->as_C_string() 4731 ); 4732 return; 4733 } 4734 } 4735 4736 // continue to look from super_m's holder's super. 4737 k = super_m->method_holder()->super(); 4738 continue; 4739 } 4740 4741 k = k->super(); 4742 } 4743 } 4744 } 4745 } 4746 4747 4748 // assumes that this_klass is an interface 4749 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4750 assert(this_klass != NULL, "invariant"); 4751 assert(this_klass->is_interface(), "not an interface"); 4752 const Array<Method*>* methods = this_klass->methods(); 4753 const int num_methods = methods->length(); 4754 4755 for (int index = 0; index < num_methods; index++) { 4756 const Method* const m = methods->at(index); 4757 // if m is static and not the init method, throw a verify error 4758 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4759 ResourceMark rm(THREAD); 4760 Exceptions::fthrow( 4761 THREAD_AND_LOCATION, 4762 vmSymbols::java_lang_VerifyError(), 4763 "Illegal static method %s in interface %s", 4764 m->name()->as_C_string(), 4765 this_klass->external_name() 4766 ); 4767 return; 4768 } 4769 } 4770 } 4771 4772 // utility methods for format checking 4773 4774 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4775 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4776 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4777 if (is_module) { 4778 ResourceMark rm(THREAD); 4779 Exceptions::fthrow( 4780 THREAD_AND_LOCATION, 4781 vmSymbols::java_lang_NoClassDefFoundError(), 4782 "%s is not a class because access_flag ACC_MODULE is set", 4783 _class_name->as_C_string()); 4784 return; 4785 } 4786 4787 if (!_need_verify) { return; } 4788 4789 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4790 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4791 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4792 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4793 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4794 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4795 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4796 4797 if ((is_abstract && is_final) || 4798 (is_interface && !is_abstract) || 4799 (is_interface && major_gte_15 && (is_super || is_enum)) || 4800 (!is_interface && major_gte_15 && is_annotation)) { 4801 ResourceMark rm(THREAD); 4802 Exceptions::fthrow( 4803 THREAD_AND_LOCATION, 4804 vmSymbols::java_lang_ClassFormatError(), 4805 "Illegal class modifiers in class %s: 0x%X", 4806 _class_name->as_C_string(), flags 4807 ); 4808 return; 4809 } 4810 } 4811 4812 static bool has_illegal_visibility(jint flags) { 4813 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4814 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4815 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4816 4817 return ((is_public && is_protected) || 4818 (is_public && is_private) || 4819 (is_protected && is_private)); 4820 } 4821 4822 // A legal major_version.minor_version must be one of the following: 4823 // 4824 // Major_version = 45, any minor_version. 4825 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0. 4826 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present. 4827 // 4828 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4829 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4830 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535 4831 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4832 if (major != max_version) { 4833 ResourceMark rm(THREAD); 4834 Exceptions::fthrow( 4835 THREAD_AND_LOCATION, 4836 vmSymbols::java_lang_UnsupportedClassVersionError(), 4837 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4838 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4839 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4840 return; 4841 } 4842 4843 if (!Arguments::enable_preview()) { 4844 ResourceMark rm(THREAD); 4845 Exceptions::fthrow( 4846 THREAD_AND_LOCATION, 4847 vmSymbols::java_lang_UnsupportedClassVersionError(), 4848 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4849 class_name->as_C_string(), major, minor); 4850 return; 4851 } 4852 4853 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4854 if (major > max_version) { 4855 ResourceMark rm(THREAD); 4856 Exceptions::fthrow( 4857 THREAD_AND_LOCATION, 4858 vmSymbols::java_lang_UnsupportedClassVersionError(), 4859 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4860 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4861 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4862 } else if (major < JAVA_MIN_SUPPORTED_VERSION) { 4863 ResourceMark rm(THREAD); 4864 Exceptions::fthrow( 4865 THREAD_AND_LOCATION, 4866 vmSymbols::java_lang_UnsupportedClassVersionError(), 4867 "%s (class file version %u.%u) was compiled with an invalid major version", 4868 class_name->as_C_string(), major, minor); 4869 } else if (minor != 0) { 4870 ResourceMark rm(THREAD); 4871 Exceptions::fthrow( 4872 THREAD_AND_LOCATION, 4873 vmSymbols::java_lang_UnsupportedClassVersionError(), 4874 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4875 class_name->as_C_string(), major, minor); 4876 } 4877 } 4878 } 4879 } 4880 4881 void ClassFileParser::verify_legal_field_modifiers(jint flags, 4882 bool is_interface, 4883 TRAPS) const { 4884 if (!_need_verify) { return; } 4885 4886 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4887 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4888 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4889 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4890 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4891 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4892 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4893 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4894 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4895 4896 bool is_illegal = false; 4897 4898 if (is_interface) { 4899 if (!is_public || !is_static || !is_final || is_private || 4900 is_protected || is_volatile || is_transient || 4901 (major_gte_15 && is_enum)) { 4902 is_illegal = true; 4903 } 4904 } else { // not interface 4905 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4906 is_illegal = true; 4907 } 4908 } 4909 4910 if (is_illegal) { 4911 ResourceMark rm(THREAD); 4912 Exceptions::fthrow( 4913 THREAD_AND_LOCATION, 4914 vmSymbols::java_lang_ClassFormatError(), 4915 "Illegal field modifiers in class %s: 0x%X", 4916 _class_name->as_C_string(), flags); 4917 return; 4918 } 4919 } 4920 4921 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4922 bool is_interface, 4923 const Symbol* name, 4924 TRAPS) const { 4925 if (!_need_verify) { return; } 4926 4927 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4928 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4929 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4930 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4931 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4932 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4933 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4934 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4935 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4936 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4937 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4938 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4939 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4940 4941 bool is_illegal = false; 4942 4943 if (is_interface) { 4944 if (major_gte_8) { 4945 // Class file version is JAVA_8_VERSION or later Methods of 4946 // interfaces may set any of the flags except ACC_PROTECTED, 4947 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4948 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4949 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4950 (is_native || is_protected || is_final || is_synchronized) || 4951 // If a specific method of a class or interface has its 4952 // ACC_ABSTRACT flag set, it must not have any of its 4953 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4954 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4955 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4956 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4957 (is_abstract && (is_private || is_static || is_strict))) { 4958 is_illegal = true; 4959 } 4960 } else if (major_gte_15) { 4961 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4962 if (!is_public || is_private || is_protected || is_static || is_final || 4963 is_synchronized || is_native || !is_abstract || is_strict) { 4964 is_illegal = true; 4965 } 4966 } else { 4967 // Class file version is pre-JAVA_1_5_VERSION 4968 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4969 is_illegal = true; 4970 } 4971 } 4972 } else { // not interface 4973 if (has_illegal_visibility(flags)) { 4974 is_illegal = true; 4975 } else { 4976 if (is_initializer) { 4977 if (is_static || is_final || is_synchronized || is_native || 4978 is_abstract || (major_gte_15 && is_bridge)) { 4979 is_illegal = true; 4980 } 4981 } else { // not initializer 4982 if (is_abstract) { 4983 if ((is_final || is_native || is_private || is_static || 4984 (major_gte_15 && (is_synchronized || is_strict)))) { 4985 is_illegal = true; 4986 } 4987 } 4988 } 4989 } 4990 } 4991 4992 if (is_illegal) { 4993 ResourceMark rm(THREAD); 4994 Exceptions::fthrow( 4995 THREAD_AND_LOCATION, 4996 vmSymbols::java_lang_ClassFormatError(), 4997 "Method %s in class %s has illegal modifiers: 0x%X", 4998 name->as_C_string(), _class_name->as_C_string(), flags); 4999 return; 5000 } 5001 } 5002 5003 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 5004 int length, 5005 TRAPS) const { 5006 assert(_need_verify, "only called when _need_verify is true"); 5007 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 5008 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5009 } 5010 } 5011 5012 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5013 // In class names, '/' separates unqualified names. This is verified in this function also. 5014 // Method names also may not contain the characters '<' or '>', unless <init> 5015 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5016 // method. Because these names have been checked as special cases before 5017 // calling this method in verify_legal_method_name. 5018 // 5019 // This method is also called from the modular system APIs in modules.cpp 5020 // to verify the validity of module and package names. 5021 bool ClassFileParser::verify_unqualified_name(const char* name, 5022 unsigned int length, 5023 int type) { 5024 for (const char* p = name; p != name + length;) { 5025 jchar ch = *p; 5026 if (ch < 128) { 5027 if (ch == '.' || ch == ';' || ch == '[' ) { 5028 return false; // do not permit '.', ';', or '[' 5029 } 5030 if (ch == '/') { 5031 // check for '//' or leading or trailing '/' which are not legal 5032 // unqualified name must not be empty 5033 if (type == ClassFileParser::LegalClass) { 5034 if (p == name || p+1 >= name+length || *(p+1) == '/') { 5035 return false; 5036 } 5037 } else { 5038 return false; // do not permit '/' unless it's class name 5039 } 5040 } 5041 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) { 5042 return false; // do not permit '<' or '>' in method names 5043 } 5044 p++; 5045 } else { 5046 char* tmp_p = UTF8::next(p, &ch); 5047 p = tmp_p; 5048 } 5049 } 5050 return true; 5051 } 5052 5053 // Take pointer to a string. Skip over the longest part of the string that could 5054 // be taken as a fieldname. Allow '/' if slash_ok is true. 5055 // Return a pointer to just past the fieldname. 5056 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5057 // being true, we saw consecutive slashes (meaning we were looking for a 5058 // qualified path but found something that was badly-formed). 5059 static const char* skip_over_field_name(const char* name, 5060 bool slash_ok, 5061 unsigned int length) { 5062 const char* p; 5063 jboolean last_is_slash = false; 5064 jboolean not_first_ch = false; 5065 5066 for (p = name; p != name + length; not_first_ch = true) { 5067 const char* old_p = p; 5068 jchar ch = *p; 5069 if (ch < 128) { 5070 p++; 5071 // quick check for ascii 5072 if ((ch >= 'a' && ch <= 'z') || 5073 (ch >= 'A' && ch <= 'Z') || 5074 (ch == '_' || ch == '$') || 5075 (not_first_ch && ch >= '0' && ch <= '9')) { 5076 last_is_slash = false; 5077 continue; 5078 } 5079 if (slash_ok && ch == '/') { 5080 if (last_is_slash) { 5081 return NULL; // Don't permit consecutive slashes 5082 } 5083 last_is_slash = true; 5084 continue; 5085 } 5086 } 5087 else { 5088 jint unicode_ch; 5089 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5090 p = tmp_p; 5091 last_is_slash = false; 5092 // Check if ch is Java identifier start or is Java identifier part 5093 // 4672820: call java.lang.Character methods directly without generating separate tables. 5094 EXCEPTION_MARK; 5095 5096 // return value 5097 JavaValue result(T_BOOLEAN); 5098 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5099 JavaCallArguments args; 5100 args.push_int(unicode_ch); 5101 5102 // public static boolean isJavaIdentifierStart(char ch); 5103 JavaCalls::call_static(&result, 5104 SystemDictionary::Character_klass(), 5105 vmSymbols::isJavaIdentifierStart_name(), 5106 vmSymbols::int_bool_signature(), 5107 &args, 5108 THREAD); 5109 5110 if (HAS_PENDING_EXCEPTION) { 5111 CLEAR_PENDING_EXCEPTION; 5112 return 0; 5113 } 5114 if (result.get_jboolean()) { 5115 continue; 5116 } 5117 5118 if (not_first_ch) { 5119 // public static boolean isJavaIdentifierPart(char ch); 5120 JavaCalls::call_static(&result, 5121 SystemDictionary::Character_klass(), 5122 vmSymbols::isJavaIdentifierPart_name(), 5123 vmSymbols::int_bool_signature(), 5124 &args, 5125 THREAD); 5126 5127 if (HAS_PENDING_EXCEPTION) { 5128 CLEAR_PENDING_EXCEPTION; 5129 return 0; 5130 } 5131 5132 if (result.get_jboolean()) { 5133 continue; 5134 } 5135 } 5136 } 5137 return (not_first_ch) ? old_p : NULL; 5138 } 5139 return (not_first_ch) ? p : NULL; 5140 } 5141 5142 // Take pointer to a string. Skip over the longest part of the string that could 5143 // be taken as a field signature. Allow "void" if void_ok. 5144 // Return a pointer to just past the signature. 5145 // Return NULL if no legal signature is found. 5146 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5147 bool void_ok, 5148 unsigned int length, 5149 TRAPS) const { 5150 unsigned int array_dim = 0; 5151 while (length > 0) { 5152 switch (signature[0]) { 5153 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5154 case JVM_SIGNATURE_BOOLEAN: 5155 case JVM_SIGNATURE_BYTE: 5156 case JVM_SIGNATURE_CHAR: 5157 case JVM_SIGNATURE_SHORT: 5158 case JVM_SIGNATURE_INT: 5159 case JVM_SIGNATURE_FLOAT: 5160 case JVM_SIGNATURE_LONG: 5161 case JVM_SIGNATURE_DOUBLE: 5162 return signature + 1; 5163 case JVM_SIGNATURE_CLASS: { 5164 if (_major_version < JAVA_1_5_VERSION) { 5165 // Skip over the class name if one is there 5166 const char* const p = skip_over_field_name(signature + 1, true, --length); 5167 5168 // The next character better be a semicolon 5169 if (p && (p - signature) > 1 && p[0] == ';') { 5170 return p + 1; 5171 } 5172 } 5173 else { 5174 // Skip leading 'L' and ignore first appearance of ';' 5175 length--; 5176 signature++; 5177 char* c = strchr((char*) signature, ';'); 5178 // Format check signature 5179 if (c != NULL) { 5180 ResourceMark rm(THREAD); 5181 int newlen = c - (char*) signature; 5182 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1); 5183 strncpy(sig, signature, newlen); 5184 sig[newlen] = '\0'; 5185 5186 bool legal = verify_unqualified_name(sig, newlen, LegalClass); 5187 if (!legal) { 5188 classfile_parse_error("Class name contains illegal character " 5189 "in descriptor in class file %s", 5190 CHECK_0); 5191 return NULL; 5192 } 5193 return signature + newlen + 1; 5194 } 5195 } 5196 return NULL; 5197 } 5198 case JVM_SIGNATURE_ARRAY: 5199 array_dim++; 5200 if (array_dim > 255) { 5201 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5202 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5203 } 5204 // The rest of what's there better be a legal signature 5205 signature++; 5206 length--; 5207 void_ok = false; 5208 break; 5209 default: 5210 return NULL; 5211 } 5212 } 5213 return NULL; 5214 } 5215 5216 // Checks if name is a legal class name. 5217 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5218 if (!_need_verify || _relax_verify) { return; } 5219 5220 char buf[fixed_buffer_size]; 5221 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5222 unsigned int length = name->utf8_length(); 5223 bool legal = false; 5224 5225 if (length > 0) { 5226 const char* p; 5227 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5228 p = skip_over_field_signature(bytes, false, length, CHECK); 5229 legal = (p != NULL) && ((p - bytes) == (int)length); 5230 } else if (_major_version < JAVA_1_5_VERSION) { 5231 if (bytes[0] != '<') { 5232 p = skip_over_field_name(bytes, true, length); 5233 legal = (p != NULL) && ((p - bytes) == (int)length); 5234 } 5235 } else { 5236 // 4900761: relax the constraints based on JSR202 spec 5237 // Class names may be drawn from the entire Unicode character set. 5238 // Identifiers between '/' must be unqualified names. 5239 // The utf8 string has been verified when parsing cpool entries. 5240 legal = verify_unqualified_name(bytes, length, LegalClass); 5241 } 5242 } 5243 if (!legal) { 5244 ResourceMark rm(THREAD); 5245 assert(_class_name != NULL, "invariant"); 5246 Exceptions::fthrow( 5247 THREAD_AND_LOCATION, 5248 vmSymbols::java_lang_ClassFormatError(), 5249 "Illegal class name \"%s\" in class file %s", bytes, 5250 _class_name->as_C_string() 5251 ); 5252 return; 5253 } 5254 } 5255 5256 // Checks if name is a legal field name. 5257 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5258 if (!_need_verify || _relax_verify) { return; } 5259 5260 char buf[fixed_buffer_size]; 5261 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5262 unsigned int length = name->utf8_length(); 5263 bool legal = false; 5264 5265 if (length > 0) { 5266 if (_major_version < JAVA_1_5_VERSION) { 5267 if (bytes[0] != '<') { 5268 const char* p = skip_over_field_name(bytes, false, length); 5269 legal = (p != NULL) && ((p - bytes) == (int)length); 5270 } 5271 } else { 5272 // 4881221: relax the constraints based on JSR202 spec 5273 legal = verify_unqualified_name(bytes, length, LegalField); 5274 } 5275 } 5276 5277 if (!legal) { 5278 ResourceMark rm(THREAD); 5279 assert(_class_name != NULL, "invariant"); 5280 Exceptions::fthrow( 5281 THREAD_AND_LOCATION, 5282 vmSymbols::java_lang_ClassFormatError(), 5283 "Illegal field name \"%s\" in class %s", bytes, 5284 _class_name->as_C_string() 5285 ); 5286 return; 5287 } 5288 } 5289 5290 // Checks if name is a legal method name. 5291 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5292 if (!_need_verify || _relax_verify) { return; } 5293 5294 assert(name != NULL, "method name is null"); 5295 char buf[fixed_buffer_size]; 5296 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5297 unsigned int length = name->utf8_length(); 5298 bool legal = false; 5299 5300 if (length > 0) { 5301 if (bytes[0] == '<') { 5302 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5303 legal = true; 5304 } 5305 } else if (_major_version < JAVA_1_5_VERSION) { 5306 const char* p; 5307 p = skip_over_field_name(bytes, false, length); 5308 legal = (p != NULL) && ((p - bytes) == (int)length); 5309 } else { 5310 // 4881221: relax the constraints based on JSR202 spec 5311 legal = verify_unqualified_name(bytes, length, LegalMethod); 5312 } 5313 } 5314 5315 if (!legal) { 5316 ResourceMark rm(THREAD); 5317 assert(_class_name != NULL, "invariant"); 5318 Exceptions::fthrow( 5319 THREAD_AND_LOCATION, 5320 vmSymbols::java_lang_ClassFormatError(), 5321 "Illegal method name \"%s\" in class %s", bytes, 5322 _class_name->as_C_string() 5323 ); 5324 return; 5325 } 5326 } 5327 5328 5329 // Checks if signature is a legal field signature. 5330 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5331 const Symbol* signature, 5332 TRAPS) const { 5333 if (!_need_verify) { return; } 5334 5335 char buf[fixed_buffer_size]; 5336 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5337 const unsigned int length = signature->utf8_length(); 5338 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5339 5340 if (p == NULL || (p - bytes) != (int)length) { 5341 throwIllegalSignature("Field", name, signature, CHECK); 5342 } 5343 } 5344 5345 // Checks if signature is a legal method signature. 5346 // Returns number of parameters 5347 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5348 const Symbol* signature, 5349 TRAPS) const { 5350 if (!_need_verify) { 5351 // make sure caller's args_size will be less than 0 even for non-static 5352 // method so it will be recomputed in compute_size_of_parameters(). 5353 return -2; 5354 } 5355 5356 // Class initializers cannot have args for class format version >= 51. 5357 if (name == vmSymbols::class_initializer_name() && 5358 signature != vmSymbols::void_method_signature() && 5359 _major_version >= JAVA_7_VERSION) { 5360 throwIllegalSignature("Method", name, signature, CHECK_0); 5361 return 0; 5362 } 5363 5364 unsigned int args_size = 0; 5365 char buf[fixed_buffer_size]; 5366 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5367 unsigned int length = signature->utf8_length(); 5368 const char* nextp; 5369 5370 // The first character must be a '(' 5371 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5372 length--; 5373 // Skip over legal field signatures 5374 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5375 while ((length > 0) && (nextp != NULL)) { 5376 args_size++; 5377 if (p[0] == 'J' || p[0] == 'D') { 5378 args_size++; 5379 } 5380 length -= nextp - p; 5381 p = nextp; 5382 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5383 } 5384 // The first non-signature thing better be a ')' 5385 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5386 length--; 5387 if (name->utf8_length() > 0 && name->char_at(0) == '<') { 5388 // All internal methods must return void 5389 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5390 return args_size; 5391 } 5392 } else { 5393 // Now we better just have a return value 5394 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5395 if (nextp && ((int)length == (nextp - p))) { 5396 return args_size; 5397 } 5398 } 5399 } 5400 } 5401 // Report error 5402 throwIllegalSignature("Method", name, signature, CHECK_0); 5403 return 0; 5404 } 5405 5406 int ClassFileParser::static_field_size() const { 5407 assert(_field_info != NULL, "invariant"); 5408 return _field_info->static_field_size; 5409 } 5410 5411 int ClassFileParser::total_oop_map_count() const { 5412 assert(_field_info != NULL, "invariant"); 5413 return _field_info->total_oop_map_count; 5414 } 5415 5416 jint ClassFileParser::layout_size() const { 5417 assert(_field_info != NULL, "invariant"); 5418 return _field_info->instance_size; 5419 } 5420 5421 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5422 const Array<Method*>* methods) { 5423 assert(ik != NULL, "invariant"); 5424 assert(methods != NULL, "invariant"); 5425 5426 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5427 // (We used to do this lazily, but now we query it in Rewriter, 5428 // which is eagerly done for every method, so we might as well do it now, 5429 // when everything is fresh in memory.) 5430 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5431 5432 if (klass_id != vmSymbols::NO_SID) { 5433 for (int j = 0; j < methods->length(); ++j) { 5434 Method* method = methods->at(j); 5435 method->init_intrinsic_id(); 5436 5437 if (CheckIntrinsics) { 5438 // Check if an intrinsic is defined for method 'method', 5439 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5440 if (method->intrinsic_id() != vmIntrinsics::_none && 5441 !method->intrinsic_candidate()) { 5442 tty->print("Compiler intrinsic is defined for method [%s], " 5443 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5444 method->name_and_sig_as_C_string(), 5445 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5446 ); 5447 tty->cr(); 5448 DEBUG_ONLY(vm_exit(1)); 5449 } 5450 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5451 // but there is no intrinsic available for it. 5452 if (method->intrinsic_candidate() && 5453 method->intrinsic_id() == vmIntrinsics::_none) { 5454 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5455 "but no compiler intrinsic is defined for the method.%s", 5456 method->name_and_sig_as_C_string(), 5457 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5458 ); 5459 tty->cr(); 5460 DEBUG_ONLY(vm_exit(1)); 5461 } 5462 } 5463 } // end for 5464 5465 #ifdef ASSERT 5466 if (CheckIntrinsics) { 5467 // Check for orphan methods in the current class. A method m 5468 // of a class C is orphan if an intrinsic is defined for method m, 5469 // but class C does not declare m. 5470 // The check is potentially expensive, therefore it is available 5471 // only in debug builds. 5472 5473 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5474 if (vmIntrinsics::_compiledLambdaForm == id) { 5475 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5476 // generated for the JVM from a LambdaForm and therefore no method 5477 // is defined for it. 5478 continue; 5479 } 5480 5481 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5482 // Check if the current class contains a method with the same 5483 // name, flags, signature. 5484 bool match = false; 5485 for (int j = 0; j < methods->length(); ++j) { 5486 const Method* method = methods->at(j); 5487 if (method->intrinsic_id() == id) { 5488 match = true; 5489 break; 5490 } 5491 } 5492 5493 if (!match) { 5494 char buf[1000]; 5495 tty->print("Compiler intrinsic is defined for method [%s], " 5496 "but the method is not available in class [%s].%s", 5497 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5498 buf, sizeof(buf)), 5499 ik->name()->as_C_string(), 5500 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5501 ); 5502 tty->cr(); 5503 DEBUG_ONLY(vm_exit(1)); 5504 } 5505 } 5506 } // end for 5507 } // CheckIntrinsics 5508 #endif // ASSERT 5509 } 5510 } 5511 5512 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5513 if (_klass != NULL) { 5514 return _klass; 5515 } 5516 5517 InstanceKlass* const ik = 5518 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5519 5520 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5521 5522 assert(_klass == ik, "invariant"); 5523 5524 ik->set_has_passed_fingerprint_check(false); 5525 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5526 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5527 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) { 5528 // This class matches with a class saved in an AOT library 5529 ik->set_has_passed_fingerprint_check(true); 5530 } else { 5531 ResourceMark rm; 5532 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5533 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5534 } 5535 } 5536 5537 return ik; 5538 } 5539 5540 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5541 assert(ik != NULL, "invariant"); 5542 5543 // Set name and CLD before adding to CLD 5544 ik->set_class_loader_data(_loader_data); 5545 ik->set_name(_class_name); 5546 5547 // Add all classes to our internal class loader list here, 5548 // including classes in the bootstrap (NULL) class loader. 5549 const bool publicize = !is_internal(); 5550 5551 _loader_data->add_class(ik, publicize); 5552 5553 set_klass_to_deallocate(ik); 5554 5555 assert(_field_info != NULL, "invariant"); 5556 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5557 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count, 5558 "sanity"); 5559 5560 assert(ik->is_instance_klass(), "sanity"); 5561 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5562 5563 // Fill in information already parsed 5564 ik->set_should_verify_class(_need_verify); 5565 5566 // Not yet: supers are done below to support the new subtype-checking fields 5567 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5568 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5569 assert(_fac != NULL, "invariant"); 5570 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]); 5571 5572 // this transfers ownership of a lot of arrays from 5573 // the parser onto the InstanceKlass* 5574 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5575 5576 // note that is not safe to use the fields in the parser from this point on 5577 assert(NULL == _cp, "invariant"); 5578 assert(NULL == _fields, "invariant"); 5579 assert(NULL == _methods, "invariant"); 5580 assert(NULL == _inner_classes, "invariant"); 5581 assert(NULL == _nest_members, "invariant"); 5582 assert(NULL == _local_interfaces, "invariant"); 5583 assert(NULL == _combined_annotations, "invariant"); 5584 5585 if (_has_final_method) { 5586 ik->set_has_final_method(); 5587 } 5588 5589 ik->copy_method_ordering(_method_ordering, CHECK); 5590 // The InstanceKlass::_methods_jmethod_ids cache 5591 // is managed on the assumption that the initial cache 5592 // size is equal to the number of methods in the class. If 5593 // that changes, then InstanceKlass::idnum_can_increment() 5594 // has to be changed accordingly. 5595 ik->set_initial_method_idnum(ik->methods()->length()); 5596 5597 ik->set_this_class_index(_this_class_index); 5598 5599 if (is_unsafe_anonymous()) { 5600 // _this_class_index is a CONSTANT_Class entry that refers to this 5601 // anonymous class itself. If this class needs to refer to its own methods or 5602 // fields, it would use a CONSTANT_MethodRef, etc, which would reference 5603 // _this_class_index. However, because this class is anonymous (it's 5604 // not stored in SystemDictionary), _this_class_index cannot be resolved 5605 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5606 // Therefore, we must eagerly resolve _this_class_index now. 5607 ik->constants()->klass_at_put(_this_class_index, ik); 5608 } 5609 5610 ik->set_minor_version(_minor_version); 5611 ik->set_major_version(_major_version); 5612 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5613 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5614 5615 if (_unsafe_anonymous_host != NULL) { 5616 assert (ik->is_unsafe_anonymous(), "should be the same"); 5617 ik->set_unsafe_anonymous_host(_unsafe_anonymous_host); 5618 } 5619 5620 // Set PackageEntry for this_klass 5621 oop cl = ik->class_loader(); 5622 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5623 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5624 ik->set_package(cld, CHECK); 5625 5626 const Array<Method*>* const methods = ik->methods(); 5627 assert(methods != NULL, "invariant"); 5628 const int methods_len = methods->length(); 5629 5630 check_methods_for_intrinsics(ik, methods); 5631 5632 // Fill in field values obtained by parse_classfile_attributes 5633 if (_parsed_annotations->has_any_annotations()) { 5634 _parsed_annotations->apply_to(ik); 5635 } 5636 5637 apply_parsed_class_attributes(ik); 5638 5639 // Miranda methods 5640 if ((_num_miranda_methods > 0) || 5641 // if this class introduced new miranda methods or 5642 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5643 // super class exists and this class inherited miranda methods 5644 ) { 5645 ik->set_has_miranda_methods(); // then set a flag 5646 } 5647 5648 // Fill in information needed to compute superclasses. 5649 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5650 ik->set_transitive_interfaces(_transitive_interfaces); 5651 _transitive_interfaces = NULL; 5652 5653 // Initialize itable offset tables 5654 klassItable::setup_itable_offset_table(ik); 5655 5656 // Compute transitive closure of interfaces this class implements 5657 // Do final class setup 5658 fill_oop_maps(ik, 5659 _field_info->nonstatic_oop_map_count, 5660 _field_info->nonstatic_oop_offsets, 5661 _field_info->nonstatic_oop_counts); 5662 5663 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5664 set_precomputed_flags(ik); 5665 5666 // check if this class can access its super class 5667 check_super_class_access(ik, CHECK); 5668 5669 // check if this class can access its superinterfaces 5670 check_super_interface_access(ik, CHECK); 5671 5672 // check if this class overrides any final method 5673 check_final_method_override(ik, CHECK); 5674 5675 // reject static interface methods prior to Java 8 5676 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5677 check_illegal_static_method(ik, CHECK); 5678 } 5679 5680 // Obtain this_klass' module entry 5681 ModuleEntry* module_entry = ik->module(); 5682 assert(module_entry != NULL, "module_entry should always be set"); 5683 5684 // Obtain java.lang.Module 5685 Handle module_handle(THREAD, module_entry->module()); 5686 5687 // Allocate mirror and initialize static fields 5688 // The create_mirror() call will also call compute_modifiers() 5689 java_lang_Class::create_mirror(ik, 5690 Handle(THREAD, _loader_data->class_loader()), 5691 module_handle, 5692 _protection_domain, 5693 CHECK); 5694 5695 assert(_all_mirandas != NULL, "invariant"); 5696 5697 // Generate any default methods - default methods are public interface methods 5698 // that have a default implementation. This is new with Java 8. 5699 if (_has_nonstatic_concrete_methods) { 5700 DefaultMethods::generate_default_methods(ik, 5701 _all_mirandas, 5702 CHECK); 5703 } 5704 5705 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5706 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5707 !module_entry->has_default_read_edges()) { 5708 if (!module_entry->set_has_default_read_edges()) { 5709 // We won a potential race 5710 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5711 } 5712 } 5713 5714 // Update the loader_data graph. 5715 record_defined_class_dependencies(ik, CHECK); 5716 5717 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5718 5719 if (!is_internal()) { 5720 if (log_is_enabled(Info, class, load)) { 5721 ResourceMark rm; 5722 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5723 ik->print_class_load_logging(_loader_data, module_name, _stream); 5724 } 5725 5726 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5727 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION && 5728 log_is_enabled(Info, class, preview)) { 5729 ResourceMark rm; 5730 log_info(class, preview)("Loading preview feature type %s", ik->external_name()); 5731 } 5732 5733 if (log_is_enabled(Debug, class, resolve)) { 5734 ResourceMark rm; 5735 // print out the superclass. 5736 const char * from = ik->external_name(); 5737 if (ik->java_super() != NULL) { 5738 log_debug(class, resolve)("%s %s (super)", 5739 from, 5740 ik->java_super()->external_name()); 5741 } 5742 // print out each of the interface classes referred to by this class. 5743 const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces(); 5744 if (local_interfaces != NULL) { 5745 const int length = local_interfaces->length(); 5746 for (int i = 0; i < length; i++) { 5747 const InstanceKlass* const k = local_interfaces->at(i); 5748 const char * to = k->external_name(); 5749 log_debug(class, resolve)("%s %s (interface)", from, to); 5750 } 5751 } 5752 } 5753 } 5754 5755 JFR_ONLY(INIT_ID(ik);) 5756 5757 // If we reach here, all is well. 5758 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5759 // in order for it to not be destroyed in the ClassFileParser destructor. 5760 set_klass_to_deallocate(NULL); 5761 5762 // it's official 5763 set_klass(ik); 5764 5765 debug_only(ik->verify();) 5766 } 5767 5768 // For an unsafe anonymous class that is in the unnamed package, move it to its host class's 5769 // package by prepending its host class's package name to its class name and setting 5770 // its _class_name field. 5771 void ClassFileParser::prepend_host_package_name(const InstanceKlass* unsafe_anonymous_host, TRAPS) { 5772 ResourceMark rm(THREAD); 5773 assert(strrchr(_class_name->as_C_string(), '/') == NULL, 5774 "Unsafe anonymous class should not be in a package"); 5775 const char* host_pkg_name = 5776 ClassLoader::package_from_name(unsafe_anonymous_host->name()->as_C_string(), NULL); 5777 5778 if (host_pkg_name != NULL) { 5779 size_t host_pkg_len = strlen(host_pkg_name); 5780 int class_name_len = _class_name->utf8_length(); 5781 char* new_anon_name = 5782 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len); 5783 // Copy host package name and trailing /. 5784 strncpy(new_anon_name, host_pkg_name, host_pkg_len); 5785 new_anon_name[host_pkg_len] = '/'; 5786 // Append unsafe anonymous class name. The unsafe anonymous class name can contain odd 5787 // characters. So, do a strncpy instead of using sprintf("%s..."). 5788 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len); 5789 5790 // Create a symbol and update the anonymous class name. 5791 _class_name = SymbolTable::new_symbol(new_anon_name, 5792 (int)host_pkg_len + 1 + class_name_len, 5793 CHECK); 5794 } 5795 } 5796 5797 // If the host class and the anonymous class are in the same package then do 5798 // nothing. If the anonymous class is in the unnamed package then move it to its 5799 // host's package. If the classes are in different packages then throw an IAE 5800 // exception. 5801 void ClassFileParser::fix_unsafe_anonymous_class_name(TRAPS) { 5802 assert(_unsafe_anonymous_host != NULL, "Expected an unsafe anonymous class"); 5803 5804 const jbyte* anon_last_slash = UTF8::strrchr((const jbyte*)_class_name->base(), 5805 _class_name->utf8_length(), '/'); 5806 if (anon_last_slash == NULL) { // Unnamed package 5807 prepend_host_package_name(_unsafe_anonymous_host, CHECK); 5808 } else { 5809 if (!_unsafe_anonymous_host->is_same_class_package(_unsafe_anonymous_host->class_loader(), _class_name)) { 5810 ResourceMark rm(THREAD); 5811 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5812 err_msg("Host class %s and anonymous class %s are in different packages", 5813 _unsafe_anonymous_host->name()->as_C_string(), _class_name->as_C_string())); 5814 } 5815 } 5816 } 5817 5818 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5819 bool trusted = (loader_data->is_the_null_class_loader_data() || 5820 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 5821 bool need_verify = 5822 // verifyAll 5823 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5824 // verifyRemote 5825 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5826 return !need_verify; 5827 } 5828 5829 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5830 Symbol* name, 5831 ClassLoaderData* loader_data, 5832 Handle protection_domain, 5833 const InstanceKlass* unsafe_anonymous_host, 5834 GrowableArray<Handle>* cp_patches, 5835 Publicity pub_level, 5836 TRAPS) : 5837 _stream(stream), 5838 _requested_name(name), 5839 _loader_data(loader_data), 5840 _unsafe_anonymous_host(unsafe_anonymous_host), 5841 _cp_patches(cp_patches), 5842 _num_patched_klasses(0), 5843 _max_num_patched_klasses(0), 5844 _orig_cp_size(0), 5845 _first_patched_klass_resolved_index(0), 5846 _super_klass(), 5847 _cp(NULL), 5848 _fields(NULL), 5849 _methods(NULL), 5850 _inner_classes(NULL), 5851 _nest_members(NULL), 5852 _nest_host(0), 5853 _local_interfaces(NULL), 5854 _transitive_interfaces(NULL), 5855 _combined_annotations(NULL), 5856 _annotations(NULL), 5857 _type_annotations(NULL), 5858 _fields_annotations(NULL), 5859 _fields_type_annotations(NULL), 5860 _klass(NULL), 5861 _klass_to_deallocate(NULL), 5862 _parsed_annotations(NULL), 5863 _fac(NULL), 5864 _field_info(NULL), 5865 _method_ordering(NULL), 5866 _all_mirandas(NULL), 5867 _vtable_size(0), 5868 _itable_size(0), 5869 _num_miranda_methods(0), 5870 _rt(REF_NONE), 5871 _protection_domain(protection_domain), 5872 _access_flags(), 5873 _pub_level(pub_level), 5874 _bad_constant_seen(0), 5875 _synthetic_flag(false), 5876 _sde_length(false), 5877 _sde_buffer(NULL), 5878 _sourcefile_index(0), 5879 _generic_signature_index(0), 5880 _major_version(0), 5881 _minor_version(0), 5882 _this_class_index(0), 5883 _super_class_index(0), 5884 _itfs_len(0), 5885 _java_fields_count(0), 5886 _need_verify(false), 5887 _relax_verify(false), 5888 _has_nonstatic_concrete_methods(false), 5889 _declares_nonstatic_concrete_methods(false), 5890 _has_final_method(false), 5891 _has_finalizer(false), 5892 _has_empty_finalizer(false), 5893 _has_vanilla_constructor(false), 5894 _max_bootstrap_specifier_index(-1) { 5895 5896 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 5897 5898 assert(THREAD->is_Java_thread(), "invariant"); 5899 assert(_loader_data != NULL, "invariant"); 5900 assert(stream != NULL, "invariant"); 5901 assert(_stream != NULL, "invariant"); 5902 assert(_stream->buffer() == _stream->current(), "invariant"); 5903 assert(_class_name != NULL, "invariant"); 5904 assert(0 == _access_flags.as_int(), "invariant"); 5905 5906 // Figure out whether we can skip format checking (matching classic VM behavior) 5907 if (DumpSharedSpaces) { 5908 // verify == true means it's a 'remote' class (i.e., non-boot class) 5909 // Verification decision is based on BytecodeVerificationRemote flag 5910 // for those classes. 5911 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 5912 BytecodeVerificationLocal; 5913 } 5914 else { 5915 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 5916 stream->need_verify()); 5917 } 5918 if (_cp_patches != NULL) { 5919 int len = _cp_patches->length(); 5920 for (int i=0; i<len; i++) { 5921 if (has_cp_patch_at(i)) { 5922 Handle patch = cp_patch_at(i); 5923 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 5924 // We need to append the names of the patched classes to the end of the constant pool, 5925 // because a patched class may have a Utf8 name that's not already included in the 5926 // original constant pool. These class names are used when patch_constant_pool() 5927 // calls patch_class(). 5928 // 5929 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 5930 // At this point, we don't know the tag for index i yet, because we haven't parsed the 5931 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 5932 _max_num_patched_klasses++; 5933 } 5934 } 5935 } 5936 } 5937 5938 // synch back verification state to stream 5939 stream->set_verify(_need_verify); 5940 5941 // Check if verification needs to be relaxed for this class file 5942 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 5943 _relax_verify = relax_format_check_for(_loader_data); 5944 5945 parse_stream(stream, CHECK); 5946 5947 post_process_parsed_stream(stream, _cp, CHECK); 5948 } 5949 5950 void ClassFileParser::clear_class_metadata() { 5951 // metadata created before the instance klass is created. Must be 5952 // deallocated if classfile parsing returns an error. 5953 _cp = NULL; 5954 _fields = NULL; 5955 _methods = NULL; 5956 _inner_classes = NULL; 5957 _nest_members = NULL; 5958 _local_interfaces = NULL; 5959 _combined_annotations = NULL; 5960 _annotations = _type_annotations = NULL; 5961 _fields_annotations = _fields_type_annotations = NULL; 5962 } 5963 5964 // Destructor to clean up 5965 ClassFileParser::~ClassFileParser() { 5966 if (_cp != NULL) { 5967 MetadataFactory::free_metadata(_loader_data, _cp); 5968 } 5969 if (_fields != NULL) { 5970 MetadataFactory::free_array<u2>(_loader_data, _fields); 5971 } 5972 5973 if (_methods != NULL) { 5974 // Free methods 5975 InstanceKlass::deallocate_methods(_loader_data, _methods); 5976 } 5977 5978 // beware of the Universe::empty_blah_array!! 5979 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 5980 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 5981 } 5982 5983 if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) { 5984 MetadataFactory::free_array<u2>(_loader_data, _nest_members); 5985 } 5986 5987 // Free interfaces 5988 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 5989 _local_interfaces, _transitive_interfaces); 5990 5991 if (_combined_annotations != NULL) { 5992 // After all annotations arrays have been created, they are installed into the 5993 // Annotations object that will be assigned to the InstanceKlass being created. 5994 5995 // Deallocate the Annotations object and the installed annotations arrays. 5996 _combined_annotations->deallocate_contents(_loader_data); 5997 5998 // If the _combined_annotations pointer is non-NULL, 5999 // then the other annotations fields should have been cleared. 6000 assert(_annotations == NULL, "Should have been cleared"); 6001 assert(_type_annotations == NULL, "Should have been cleared"); 6002 assert(_fields_annotations == NULL, "Should have been cleared"); 6003 assert(_fields_type_annotations == NULL, "Should have been cleared"); 6004 } else { 6005 // If the annotations arrays were not installed into the Annotations object, 6006 // then they have to be deallocated explicitly. 6007 MetadataFactory::free_array<u1>(_loader_data, _annotations); 6008 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 6009 Annotations::free_contents(_loader_data, _fields_annotations); 6010 Annotations::free_contents(_loader_data, _fields_type_annotations); 6011 } 6012 6013 clear_class_metadata(); 6014 _transitive_interfaces = NULL; 6015 6016 // deallocate the klass if already created. Don't directly deallocate, but add 6017 // to the deallocate list so that the klass is removed from the CLD::_klasses list 6018 // at a safepoint. 6019 if (_klass_to_deallocate != NULL) { 6020 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 6021 } 6022 } 6023 6024 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 6025 TRAPS) { 6026 6027 assert(stream != NULL, "invariant"); 6028 assert(_class_name != NULL, "invariant"); 6029 6030 // BEGIN STREAM PARSING 6031 stream->guarantee_more(8, CHECK); // magic, major, minor 6032 // Magic value 6033 const u4 magic = stream->get_u4_fast(); 6034 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 6035 "Incompatible magic value %u in class file %s", 6036 magic, CHECK); 6037 6038 // Version numbers 6039 _minor_version = stream->get_u2_fast(); 6040 _major_version = stream->get_u2_fast(); 6041 6042 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) { 6043 ResourceMark rm; 6044 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 6045 _major_version, _minor_version, _class_name->as_C_string()); 6046 Exceptions::fthrow( 6047 THREAD_AND_LOCATION, 6048 vmSymbols::java_lang_UnsupportedClassVersionError(), 6049 "Unsupported major.minor version for dump time %u.%u", 6050 _major_version, 6051 _minor_version); 6052 } 6053 6054 // Check version numbers - we check this even with verifier off 6055 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 6056 6057 stream->guarantee_more(3, CHECK); // length, first cp tag 6058 u2 cp_size = stream->get_u2_fast(); 6059 6060 guarantee_property( 6061 cp_size >= 1, "Illegal constant pool size %u in class file %s", 6062 cp_size, CHECK); 6063 6064 _orig_cp_size = cp_size; 6065 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 6066 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 6067 } 6068 cp_size += _max_num_patched_klasses; 6069 6070 _cp = ConstantPool::allocate(_loader_data, 6071 cp_size, 6072 CHECK); 6073 6074 ConstantPool* const cp = _cp; 6075 6076 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6077 6078 assert(cp_size == (const u2)cp->length(), "invariant"); 6079 6080 // ACCESS FLAGS 6081 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6082 6083 // Access flags 6084 jint flags; 6085 // JVM_ACC_MODULE is defined in JDK-9 and later. 6086 if (_major_version >= JAVA_9_VERSION) { 6087 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 6088 } else { 6089 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 6090 } 6091 6092 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6093 // Set abstract bit for old class files for backward compatibility 6094 flags |= JVM_ACC_ABSTRACT; 6095 } 6096 6097 verify_legal_class_modifiers(flags, CHECK); 6098 6099 short bad_constant = class_bad_constant_seen(); 6100 if (bad_constant != 0) { 6101 // Do not throw CFE until after the access_flags are checked because if 6102 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6103 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 6104 } 6105 6106 _access_flags.set_flags(flags); 6107 6108 // This class and superclass 6109 _this_class_index = stream->get_u2_fast(); 6110 check_property( 6111 valid_cp_range(_this_class_index, cp_size) && 6112 cp->tag_at(_this_class_index).is_unresolved_klass(), 6113 "Invalid this class index %u in constant pool in class file %s", 6114 _this_class_index, CHECK); 6115 6116 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6117 assert(class_name_in_cp != NULL, "class_name can't be null"); 6118 6119 // Update _class_name which could be null previously 6120 // to reflect the name in the constant pool 6121 _class_name = class_name_in_cp; 6122 6123 // Don't need to check whether this class name is legal or not. 6124 // It has been checked when constant pool is parsed. 6125 // However, make sure it is not an array type. 6126 if (_need_verify) { 6127 guarantee_property(_class_name->char_at(0) != JVM_SIGNATURE_ARRAY, 6128 "Bad class name in class file %s", 6129 CHECK); 6130 } 6131 6132 // Checks if name in class file matches requested name 6133 if (_requested_name != NULL && _requested_name != _class_name) { 6134 ResourceMark rm(THREAD); 6135 Exceptions::fthrow( 6136 THREAD_AND_LOCATION, 6137 vmSymbols::java_lang_NoClassDefFoundError(), 6138 "%s (wrong name: %s)", 6139 _class_name->as_C_string(), 6140 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 6141 ); 6142 return; 6143 } 6144 6145 // if this is an anonymous class fix up its name if it's in the unnamed 6146 // package. Otherwise, throw IAE if it is in a different package than 6147 // its host class. 6148 if (_unsafe_anonymous_host != NULL) { 6149 fix_unsafe_anonymous_class_name(CHECK); 6150 } 6151 6152 // Verification prevents us from creating names with dots in them, this 6153 // asserts that that's the case. 6154 assert(is_internal_format(_class_name), "external class name format used internally"); 6155 6156 if (!is_internal()) { 6157 LogTarget(Debug, class, preorder) lt; 6158 if (lt.is_enabled()){ 6159 ResourceMark rm(THREAD); 6160 LogStream ls(lt); 6161 ls.print("%s", _class_name->as_klass_external_name()); 6162 if (stream->source() != NULL) { 6163 ls.print(" source: %s", stream->source()); 6164 } 6165 ls.cr(); 6166 } 6167 6168 #if INCLUDE_CDS 6169 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6170 if (!ClassLoader::has_jrt_entry()) { 6171 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6172 DumpLoadedClassList = NULL; 6173 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6174 _unsafe_anonymous_host == NULL) { 6175 // Only dump the classes that can be stored into CDS archive. 6176 // Unsafe anonymous classes such as generated LambdaForm classes are also not included. 6177 oop class_loader = _loader_data->class_loader(); 6178 ResourceMark rm(THREAD); 6179 bool skip = false; 6180 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6181 // For the boot and platform class loaders, skip classes that are not found in the 6182 // java runtime image, such as those found in the --patch-module entries. 6183 // These classes can't be loaded from the archive during runtime. 6184 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) { 6185 skip = true; 6186 } 6187 6188 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6189 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6190 // as they can be loaded from the archive during runtime. 6191 skip = false; 6192 } 6193 } 6194 if (skip) { 6195 tty->print_cr("skip writing class %s from source %s to classlist file", 6196 _class_name->as_C_string(), stream->source()); 6197 } else { 6198 classlist_file->print_cr("%s", _class_name->as_C_string()); 6199 classlist_file->flush(); 6200 } 6201 } 6202 } 6203 #endif 6204 } 6205 6206 // SUPERKLASS 6207 _super_class_index = stream->get_u2_fast(); 6208 _super_klass = parse_super_class(cp, 6209 _super_class_index, 6210 _need_verify, 6211 CHECK); 6212 6213 // Interfaces 6214 _itfs_len = stream->get_u2_fast(); 6215 parse_interfaces(stream, 6216 _itfs_len, 6217 cp, 6218 &_has_nonstatic_concrete_methods, 6219 CHECK); 6220 6221 assert(_local_interfaces != NULL, "invariant"); 6222 6223 // Fields (offsets are filled in later) 6224 _fac = new FieldAllocationCount(); 6225 parse_fields(stream, 6226 _access_flags.is_interface(), 6227 _fac, 6228 cp, 6229 cp_size, 6230 &_java_fields_count, 6231 CHECK); 6232 6233 assert(_fields != NULL, "invariant"); 6234 6235 // Methods 6236 AccessFlags promoted_flags; 6237 parse_methods(stream, 6238 _access_flags.is_interface(), 6239 &promoted_flags, 6240 &_has_final_method, 6241 &_declares_nonstatic_concrete_methods, 6242 CHECK); 6243 6244 assert(_methods != NULL, "invariant"); 6245 6246 // promote flags from parse_methods() to the klass' flags 6247 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6248 6249 if (_declares_nonstatic_concrete_methods) { 6250 _has_nonstatic_concrete_methods = true; 6251 } 6252 6253 // Additional attributes/annotations 6254 _parsed_annotations = new ClassAnnotationCollector(); 6255 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6256 6257 assert(_inner_classes != NULL, "invariant"); 6258 6259 // Finalize the Annotations metadata object, 6260 // now that all annotation arrays have been created. 6261 create_combined_annotations(CHECK); 6262 6263 // Make sure this is the end of class file stream 6264 guarantee_property(stream->at_eos(), 6265 "Extra bytes at the end of class file %s", 6266 CHECK); 6267 6268 // all bytes in stream read and parsed 6269 } 6270 6271 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6272 ConstantPool* cp, 6273 TRAPS) { 6274 assert(stream != NULL, "invariant"); 6275 assert(stream->at_eos(), "invariant"); 6276 assert(cp != NULL, "invariant"); 6277 assert(_loader_data != NULL, "invariant"); 6278 6279 if (_class_name == vmSymbols::java_lang_Object()) { 6280 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(), 6281 "java.lang.Object cannot implement an interface in class file %s", 6282 CHECK); 6283 } 6284 // We check super class after class file is parsed and format is checked 6285 if (_super_class_index > 0 && NULL ==_super_klass) { 6286 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6287 if (_access_flags.is_interface()) { 6288 // Before attempting to resolve the superclass, check for class format 6289 // errors not checked yet. 6290 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6291 "Interfaces must have java.lang.Object as superclass in class file %s", 6292 CHECK); 6293 } 6294 Handle loader(THREAD, _loader_data->class_loader()); 6295 _super_klass = (const InstanceKlass*) 6296 SystemDictionary::resolve_super_or_fail(_class_name, 6297 super_class_name, 6298 loader, 6299 _protection_domain, 6300 true, 6301 CHECK); 6302 } 6303 6304 if (_super_klass != NULL) { 6305 if (_super_klass->has_nonstatic_concrete_methods()) { 6306 _has_nonstatic_concrete_methods = true; 6307 } 6308 6309 if (_super_klass->is_interface()) { 6310 ResourceMark rm(THREAD); 6311 Exceptions::fthrow( 6312 THREAD_AND_LOCATION, 6313 vmSymbols::java_lang_IncompatibleClassChangeError(), 6314 "class %s has interface %s as super class", 6315 _class_name->as_klass_external_name(), 6316 _super_klass->external_name() 6317 ); 6318 return; 6319 } 6320 // Make sure super class is not final 6321 if (_super_klass->is_final()) { 6322 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6323 } 6324 } 6325 6326 // Compute the transitive list of all unique interfaces implemented by this class 6327 _transitive_interfaces = 6328 compute_transitive_interfaces(_super_klass, 6329 _local_interfaces, 6330 _loader_data, 6331 CHECK); 6332 6333 assert(_transitive_interfaces != NULL, "invariant"); 6334 6335 // sort methods 6336 _method_ordering = sort_methods(_methods); 6337 6338 _all_mirandas = new GrowableArray<Method*>(20); 6339 6340 Handle loader(THREAD, _loader_data->class_loader()); 6341 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6342 &_num_miranda_methods, 6343 _all_mirandas, 6344 _super_klass, 6345 _methods, 6346 _access_flags, 6347 _major_version, 6348 loader, 6349 _class_name, 6350 _local_interfaces, 6351 CHECK); 6352 6353 // Size of Java itable (in words) 6354 _itable_size = _access_flags.is_interface() ? 0 : 6355 klassItable::compute_itable_size(_transitive_interfaces); 6356 6357 assert(_fac != NULL, "invariant"); 6358 assert(_parsed_annotations != NULL, "invariant"); 6359 6360 _field_info = new FieldLayoutInfo(); 6361 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6362 6363 // Compute reference typ 6364 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6365 6366 } 6367 6368 void ClassFileParser::set_klass(InstanceKlass* klass) { 6369 6370 #ifdef ASSERT 6371 if (klass != NULL) { 6372 assert(NULL == _klass, "leaking?"); 6373 } 6374 #endif 6375 6376 _klass = klass; 6377 } 6378 6379 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6380 6381 #ifdef ASSERT 6382 if (klass != NULL) { 6383 assert(NULL == _klass_to_deallocate, "leaking?"); 6384 } 6385 #endif 6386 6387 _klass_to_deallocate = klass; 6388 } 6389 6390 // Caller responsible for ResourceMark 6391 // clone stream with rewound position 6392 const ClassFileStream* ClassFileParser::clone_stream() const { 6393 assert(_stream != NULL, "invariant"); 6394 6395 return _stream->clone(); 6396 } 6397 // ---------------------------------------------------------------------------- 6398 // debugging 6399 6400 #ifdef ASSERT 6401 6402 // return true if class_name contains no '.' (internal format is '/') 6403 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6404 if (class_name != NULL) { 6405 ResourceMark rm; 6406 char* name = class_name->as_C_string(); 6407 return strchr(name, '.') == NULL; 6408 } else { 6409 return true; 6410 } 6411 } 6412 6413 #endif