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