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