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