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