1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 #include "precompiled.hpp" 25 #include "jvm.h" 26 #include "aot/aotLoader.hpp" 27 #include "classfile/classFileParser.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/defaultMethods.hpp" 32 #include "classfile/dictionary.hpp" 33 #include "classfile/javaClasses.inline.hpp" 34 #include "classfile/moduleEntry.hpp" 35 #include "classfile/symbolTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/verificationType.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/allocation.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/annotations.hpp" 48 #include "oops/constantPool.inline.hpp" 49 #include "oops/fieldStreams.hpp" 50 #include "oops/instanceKlass.hpp" 51 #include "oops/instanceMirrorKlass.hpp" 52 #include "oops/klass.inline.hpp" 53 #include "oops/klassVtable.hpp" 54 #include "oops/metadata.hpp" 55 #include "oops/method.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/symbol.hpp" 58 #include "oops/valueKlass.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "runtime/arguments.hpp" 62 #include "runtime/handles.inline.hpp" 63 #include "runtime/javaCalls.hpp" 64 #include "runtime/perfData.hpp" 65 #include "runtime/reflection.hpp" 66 #include "runtime/safepointVerifiers.hpp" 67 #include "runtime/signature.hpp" 68 #include "runtime/timer.hpp" 69 #include "services/classLoadingService.hpp" 70 #include "services/threadService.hpp" 71 #include "utilities/align.hpp" 72 #include "utilities/bitMap.inline.hpp" 73 #include "utilities/copy.hpp" 74 #include "utilities/exceptions.hpp" 75 #include "utilities/globalDefinitions.hpp" 76 #include "utilities/growableArray.hpp" 77 #include "utilities/macros.hpp" 78 #include "utilities/ostream.hpp" 79 #include "utilities/resourceHash.hpp" 80 #if INCLUDE_CDS 81 #include "classfile/systemDictionaryShared.hpp" 82 #endif 83 #if INCLUDE_JFR 84 #include "jfr/support/jfrTraceIdExtension.hpp" 85 #endif 86 87 // We generally try to create the oops directly when parsing, rather than 88 // allocating temporary data structures and copying the bytes twice. A 89 // temporary area is only needed when parsing utf8 entries in the constant 90 // pool and when parsing line number tables. 91 92 // We add assert in debug mode when class format is not checked. 93 94 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 95 #define JAVA_MIN_SUPPORTED_VERSION 45 96 #define JAVA_PREVIEW_MINOR_VERSION 65535 97 98 // Used for two backward compatibility reasons: 99 // - to check for new additions to the class file format in JDK1.5 100 // - to check for bug fixes in the format checker in JDK1.5 101 #define JAVA_1_5_VERSION 49 102 103 // Used for backward compatibility reasons: 104 // - to check for javac bug fixes that happened after 1.5 105 // - also used as the max version when running in jdk6 106 #define JAVA_6_VERSION 50 107 108 // Used for backward compatibility reasons: 109 // - to disallow argument and require ACC_STATIC for <clinit> methods 110 #define JAVA_7_VERSION 51 111 112 // Extension method support. 113 #define JAVA_8_VERSION 52 114 115 #define JAVA_9_VERSION 53 116 117 #define JAVA_10_VERSION 54 118 119 #define JAVA_11_VERSION 55 120 121 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 122 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION, 123 "Unexpected bad constant pool entry"); 124 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 125 } 126 127 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 128 ConstantPool* cp, 129 const int length, 130 TRAPS) { 131 assert(stream != NULL, "invariant"); 132 assert(cp != NULL, "invariant"); 133 134 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 135 // this function (_current can be allocated in a register, with scalar 136 // replacement of aggregates). The _current pointer is copied back to 137 // stream() when this function returns. DON'T call another method within 138 // this method that uses stream(). 139 const ClassFileStream cfs1 = *stream; 140 const ClassFileStream* const cfs = &cfs1; 141 142 assert(cfs->allocated_on_stack(), "should be local"); 143 debug_only(const u1* const old_current = stream->current();) 144 145 // Used for batching symbol allocations. 146 const char* names[SymbolTable::symbol_alloc_batch_size]; 147 int lengths[SymbolTable::symbol_alloc_batch_size]; 148 int indices[SymbolTable::symbol_alloc_batch_size]; 149 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 150 int names_count = 0; 151 152 // parsing Index 0 is unused 153 for (int index = 1; index < length; index++) { 154 // Each of the following case guarantees one more byte in the stream 155 // for the following tag or the access_flags following constant pool, 156 // so we don't need bounds-check for reading tag. 157 const u1 tag = cfs->get_u1_fast(); 158 switch (tag) { 159 case JVM_CONSTANT_Class: { 160 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 161 const u2 name_index = cfs->get_u2_fast(); 162 cp->klass_index_at_put(index, name_index); 163 break; 164 } 165 case JVM_CONSTANT_Fieldref: { 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->field_at_put(index, class_index, name_and_type_index); 170 break; 171 } 172 case JVM_CONSTANT_Methodref: { 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->method_at_put(index, class_index, name_and_type_index); 177 break; 178 } 179 case JVM_CONSTANT_InterfaceMethodref: { 180 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 181 const u2 class_index = cfs->get_u2_fast(); 182 const u2 name_and_type_index = cfs->get_u2_fast(); 183 cp->interface_method_at_put(index, class_index, name_and_type_index); 184 break; 185 } 186 case JVM_CONSTANT_String : { 187 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 188 const u2 string_index = cfs->get_u2_fast(); 189 cp->string_index_at_put(index, string_index); 190 break; 191 } 192 case JVM_CONSTANT_MethodHandle : 193 case JVM_CONSTANT_MethodType: { 194 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 195 classfile_parse_error( 196 "Class file version does not support constant tag %u in class file %s", 197 tag, CHECK); 198 } 199 if (tag == JVM_CONSTANT_MethodHandle) { 200 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 201 const u1 ref_kind = cfs->get_u1_fast(); 202 const u2 method_index = cfs->get_u2_fast(); 203 cp->method_handle_index_at_put(index, ref_kind, method_index); 204 } 205 else if (tag == JVM_CONSTANT_MethodType) { 206 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 207 const u2 signature_index = cfs->get_u2_fast(); 208 cp->method_type_index_at_put(index, signature_index); 209 } 210 else { 211 ShouldNotReachHere(); 212 } 213 break; 214 } 215 case JVM_CONSTANT_Dynamic : { 216 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 217 classfile_parse_error( 218 "Class file version does not support constant tag %u in class file %s", 219 tag, CHECK); 220 } 221 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 222 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 223 const u2 name_and_type_index = cfs->get_u2_fast(); 224 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 225 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 226 } 227 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 228 break; 229 } 230 case JVM_CONSTANT_InvokeDynamic : { 231 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 232 classfile_parse_error( 233 "Class file version does not support constant tag %u in class file %s", 234 tag, CHECK); 235 } 236 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 237 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 238 const u2 name_and_type_index = cfs->get_u2_fast(); 239 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 240 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 241 } 242 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 243 break; 244 } 245 case JVM_CONSTANT_Integer: { 246 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 247 const u4 bytes = cfs->get_u4_fast(); 248 cp->int_at_put(index, (jint)bytes); 249 break; 250 } 251 case JVM_CONSTANT_Float: { 252 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 253 const u4 bytes = cfs->get_u4_fast(); 254 cp->float_at_put(index, *(jfloat*)&bytes); 255 break; 256 } 257 case JVM_CONSTANT_Long: { 258 // A mangled type might cause you to overrun allocated memory 259 guarantee_property(index + 1 < length, 260 "Invalid constant pool entry %u in class file %s", 261 index, 262 CHECK); 263 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 264 const u8 bytes = cfs->get_u8_fast(); 265 cp->long_at_put(index, bytes); 266 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 267 break; 268 } 269 case JVM_CONSTANT_Double: { 270 // A mangled type might cause you to overrun allocated memory 271 guarantee_property(index+1 < length, 272 "Invalid constant pool entry %u in class file %s", 273 index, 274 CHECK); 275 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 276 const u8 bytes = cfs->get_u8_fast(); 277 cp->double_at_put(index, *(jdouble*)&bytes); 278 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 279 break; 280 } 281 case JVM_CONSTANT_NameAndType: { 282 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 283 const u2 name_index = cfs->get_u2_fast(); 284 const u2 signature_index = cfs->get_u2_fast(); 285 cp->name_and_type_at_put(index, name_index, signature_index); 286 break; 287 } 288 case JVM_CONSTANT_Utf8 : { 289 cfs->guarantee_more(2, CHECK); // utf8_length 290 u2 utf8_length = cfs->get_u2_fast(); 291 const u1* utf8_buffer = cfs->current(); 292 assert(utf8_buffer != NULL, "null utf8 buffer"); 293 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 294 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 295 cfs->skip_u1_fast(utf8_length); 296 297 // Before storing the symbol, make sure it's legal 298 if (_need_verify) { 299 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 300 } 301 302 if (has_cp_patch_at(index)) { 303 Handle patch = clear_cp_patch_at(index); 304 guarantee_property(java_lang_String::is_instance(patch()), 305 "Illegal utf8 patch at %d in class file %s", 306 index, 307 CHECK); 308 const char* const str = java_lang_String::as_utf8_string(patch()); 309 // (could use java_lang_String::as_symbol instead, but might as well batch them) 310 utf8_buffer = (const u1*) str; 311 utf8_length = (int) strlen(str); 312 } 313 314 unsigned int hash; 315 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 316 utf8_length, 317 hash); 318 if (result == NULL) { 319 names[names_count] = (const char*)utf8_buffer; 320 lengths[names_count] = utf8_length; 321 indices[names_count] = index; 322 hashValues[names_count++] = hash; 323 if (names_count == SymbolTable::symbol_alloc_batch_size) { 324 SymbolTable::new_symbols(_loader_data, 325 cp, 326 names_count, 327 names, 328 lengths, 329 indices, 330 hashValues, 331 CHECK); 332 names_count = 0; 333 } 334 } else { 335 cp->symbol_at_put(index, result); 336 } 337 break; 338 } 339 case 19: 340 case 20: { 341 // Record that an error occurred in these two cases but keep parsing so 342 // that ACC_Module can be checked for in the access_flags. Need to 343 // throw NoClassDefFoundError in that case. 344 if (_major_version >= JAVA_9_VERSION) { 345 cfs->guarantee_more(3, CHECK); 346 cfs->get_u2_fast(); 347 set_class_bad_constant_seen(tag); 348 break; 349 } 350 } 351 default: { 352 classfile_parse_error("Unknown constant tag %u in class file %s", 353 tag, 354 CHECK); 355 break; 356 } 357 } // end of switch(tag) 358 } // end of for 359 360 // Allocate the remaining symbols 361 if (names_count > 0) { 362 SymbolTable::new_symbols(_loader_data, 363 cp, 364 names_count, 365 names, 366 lengths, 367 indices, 368 hashValues, 369 CHECK); 370 } 371 372 // Copy _current pointer of local copy back to stream. 373 assert(stream->current() == old_current, "non-exclusive use of stream"); 374 stream->set_current(cfs1.current()); 375 376 } 377 378 static inline bool valid_cp_range(int index, int length) { 379 return (index > 0 && index < length); 380 } 381 382 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 383 assert(cp != NULL, "invariant"); 384 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 385 return cp->symbol_at(index); 386 } 387 return NULL; 388 } 389 390 #ifdef ASSERT 391 PRAGMA_DIAG_PUSH 392 PRAGMA_FORMAT_NONLITERAL_IGNORED 393 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 394 ResourceMark rm(THREAD); 395 fatal(msg, _class_name->as_C_string()); 396 } 397 398 void ClassFileParser::report_assert_property_failure(const char* msg, 399 int index, 400 TRAPS) const { 401 ResourceMark rm(THREAD); 402 fatal(msg, index, _class_name->as_C_string()); 403 } 404 PRAGMA_DIAG_POP 405 #endif 406 407 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 408 ConstantPool* const cp, 409 const int length, 410 TRAPS) { 411 assert(cp != NULL, "invariant"); 412 assert(stream != NULL, "invariant"); 413 414 // parsing constant pool entries 415 parse_constant_pool_entries(stream, cp, length, CHECK); 416 if (class_bad_constant_seen() != 0) { 417 // a bad CP entry has been detected previously so stop parsing and just return. 418 return; 419 } 420 421 int index = 1; // declared outside of loops for portability 422 int num_klasses = 0; 423 424 // first verification pass - validate cross references 425 // and fixup class and string constants 426 for (index = 1; index < length; index++) { // Index 0 is unused 427 const jbyte tag = cp->tag_at(index).value(); 428 switch (tag) { 429 case JVM_CONSTANT_Class: { 430 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 431 break; 432 } 433 case JVM_CONSTANT_Fieldref: 434 // fall through 435 case JVM_CONSTANT_Methodref: 436 // fall through 437 case JVM_CONSTANT_InterfaceMethodref: { 438 if (!_need_verify) break; 439 const int klass_ref_index = cp->klass_ref_index_at(index); 440 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 441 check_property(valid_klass_reference_at(klass_ref_index), 442 "Invalid constant pool index %u in class file %s", 443 klass_ref_index, CHECK); 444 check_property(valid_cp_range(name_and_type_ref_index, length) && 445 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 446 "Invalid constant pool index %u in class file %s", 447 name_and_type_ref_index, CHECK); 448 break; 449 } 450 case JVM_CONSTANT_String: { 451 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 452 break; 453 } 454 case JVM_CONSTANT_Integer: 455 break; 456 case JVM_CONSTANT_Float: 457 break; 458 case JVM_CONSTANT_Long: 459 case JVM_CONSTANT_Double: { 460 index++; 461 check_property( 462 (index < length && cp->tag_at(index).is_invalid()), 463 "Improper constant pool long/double index %u in class file %s", 464 index, CHECK); 465 break; 466 } 467 case JVM_CONSTANT_NameAndType: { 468 if (!_need_verify) break; 469 const int name_ref_index = cp->name_ref_index_at(index); 470 const int signature_ref_index = cp->signature_ref_index_at(index); 471 check_property(valid_symbol_at(name_ref_index), 472 "Invalid constant pool index %u in class file %s", 473 name_ref_index, CHECK); 474 check_property(valid_symbol_at(signature_ref_index), 475 "Invalid constant pool index %u in class file %s", 476 signature_ref_index, CHECK); 477 break; 478 } 479 case JVM_CONSTANT_Utf8: 480 break; 481 case JVM_CONSTANT_UnresolvedClass: // fall-through 482 case JVM_CONSTANT_UnresolvedClassInError: { 483 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 484 break; 485 } 486 case JVM_CONSTANT_ClassIndex: { 487 const int class_index = cp->klass_index_at(index); 488 check_property(valid_symbol_at(class_index), 489 "Invalid constant pool index %u in class file %s", 490 class_index, CHECK); 491 492 Symbol* const name = cp->symbol_at(class_index); 493 const unsigned int name_len = name->utf8_length(); 494 495 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 496 break; 497 } 498 case JVM_CONSTANT_StringIndex: { 499 const int string_index = cp->string_index_at(index); 500 check_property(valid_symbol_at(string_index), 501 "Invalid constant pool index %u in class file %s", 502 string_index, CHECK); 503 Symbol* const sym = cp->symbol_at(string_index); 504 cp->unresolved_string_at_put(index, sym); 505 break; 506 } 507 case JVM_CONSTANT_MethodHandle: { 508 const int ref_index = cp->method_handle_index_at(index); 509 check_property(valid_cp_range(ref_index, length), 510 "Invalid constant pool index %u in class file %s", 511 ref_index, CHECK); 512 const constantTag tag = cp->tag_at(ref_index); 513 const int ref_kind = cp->method_handle_ref_kind_at(index); 514 515 switch (ref_kind) { 516 case JVM_REF_getField: 517 case JVM_REF_getStatic: 518 case JVM_REF_putField: 519 case JVM_REF_putStatic: { 520 check_property( 521 tag.is_field(), 522 "Invalid constant pool index %u in class file %s (not a field)", 523 ref_index, CHECK); 524 break; 525 } 526 case JVM_REF_invokeVirtual: 527 case JVM_REF_newInvokeSpecial: { 528 check_property( 529 tag.is_method(), 530 "Invalid constant pool index %u in class file %s (not a method)", 531 ref_index, CHECK); 532 break; 533 } 534 case JVM_REF_invokeStatic: 535 case JVM_REF_invokeSpecial: { 536 check_property( 537 tag.is_method() || 538 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 539 "Invalid constant pool index %u in class file %s (not a method)", 540 ref_index, CHECK); 541 break; 542 } 543 case JVM_REF_invokeInterface: { 544 check_property( 545 tag.is_interface_method(), 546 "Invalid constant pool index %u in class file %s (not an interface method)", 547 ref_index, CHECK); 548 break; 549 } 550 default: { 551 classfile_parse_error( 552 "Bad method handle kind at constant pool index %u in class file %s", 553 index, CHECK); 554 } 555 } // switch(refkind) 556 // Keep the ref_index unchanged. It will be indirected at link-time. 557 break; 558 } // case MethodHandle 559 case JVM_CONSTANT_MethodType: { 560 const int ref_index = cp->method_type_index_at(index); 561 check_property(valid_symbol_at(ref_index), 562 "Invalid constant pool index %u in class file %s", 563 ref_index, CHECK); 564 break; 565 } 566 case JVM_CONSTANT_Dynamic: { 567 const int name_and_type_ref_index = 568 cp->invoke_dynamic_name_and_type_ref_index_at(index); 569 570 check_property(valid_cp_range(name_and_type_ref_index, length) && 571 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 572 "Invalid constant pool index %u in class file %s", 573 name_and_type_ref_index, CHECK); 574 // bootstrap specifier index must be checked later, 575 // when BootstrapMethods attr is available 576 577 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 578 cp->set_has_dynamic_constant(); 579 break; 580 } 581 case JVM_CONSTANT_InvokeDynamic: { 582 const int name_and_type_ref_index = 583 cp->invoke_dynamic_name_and_type_ref_index_at(index); 584 585 check_property(valid_cp_range(name_and_type_ref_index, length) && 586 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 587 "Invalid constant pool index %u in class file %s", 588 name_and_type_ref_index, CHECK); 589 // bootstrap specifier index must be checked later, 590 // when BootstrapMethods attr is available 591 break; 592 } 593 default: { 594 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 595 ShouldNotReachHere(); 596 break; 597 } 598 } // switch(tag) 599 } // end of for 600 601 _first_patched_klass_resolved_index = num_klasses; 602 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 603 604 if (_cp_patches != NULL) { 605 // need to treat this_class specially... 606 607 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 608 // for now. These will be replaced with actual names of the patched classes in patch_class(). 609 Symbol* s = vmSymbols::star_name(); 610 for (int n=_orig_cp_size; n<cp->length(); n++) { 611 cp->symbol_at_put(n, s); 612 } 613 614 int this_class_index; 615 { 616 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 617 const u1* const mark = stream->current(); 618 stream->skip_u2_fast(1); // skip flags 619 this_class_index = stream->get_u2_fast(); 620 stream->set_current(mark); // revert to mark 621 } 622 623 for (index = 1; index < length; index++) { // Index 0 is unused 624 if (has_cp_patch_at(index)) { 625 guarantee_property(index != this_class_index, 626 "Illegal constant pool patch to self at %d in class file %s", 627 index, CHECK); 628 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 629 } 630 } 631 } 632 633 if (!_need_verify) { 634 return; 635 } 636 637 // second verification pass - checks the strings are of the right format. 638 // but not yet to the other entries 639 for (index = 1; index < length; index++) { 640 const jbyte tag = cp->tag_at(index).value(); 641 switch (tag) { 642 case JVM_CONSTANT_UnresolvedClass: { 643 const Symbol* const class_name = cp->klass_name_at(index); 644 // check the name, even if _cp_patches will overwrite it 645 verify_legal_class_name(class_name, CHECK); 646 break; 647 } 648 case JVM_CONSTANT_NameAndType: { 649 if (_need_verify) { 650 const int sig_index = cp->signature_ref_index_at(index); 651 const int name_index = cp->name_ref_index_at(index); 652 const Symbol* const name = cp->symbol_at(name_index); 653 const Symbol* const sig = cp->symbol_at(sig_index); 654 guarantee_property(sig->utf8_length() != 0, 655 "Illegal zero length constant pool entry at %d in class %s", 656 sig_index, CHECK); 657 guarantee_property(name->utf8_length() != 0, 658 "Illegal zero length constant pool entry at %d in class %s", 659 name_index, CHECK); 660 661 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 662 // Format check method name and signature 663 verify_legal_method_name(name, CHECK); 664 verify_legal_method_signature(name, sig, CHECK); 665 } else { 666 // Format check field name and signature 667 verify_legal_field_name(name, CHECK); 668 verify_legal_field_signature(name, sig, CHECK); 669 } 670 } 671 break; 672 } 673 case JVM_CONSTANT_Dynamic: { 674 const int name_and_type_ref_index = 675 cp->name_and_type_ref_index_at(index); 676 // already verified to be utf8 677 const int name_ref_index = 678 cp->name_ref_index_at(name_and_type_ref_index); 679 // already verified to be utf8 680 const int signature_ref_index = 681 cp->signature_ref_index_at(name_and_type_ref_index); 682 const Symbol* const name = cp->symbol_at(name_ref_index); 683 const Symbol* const signature = cp->symbol_at(signature_ref_index); 684 if (_need_verify) { 685 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 686 // Need only to be sure signature is non-zero length and the right type. 687 if (signature->utf8_length() == 0 || 688 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 689 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 690 } 691 } 692 break; 693 } 694 case JVM_CONSTANT_InvokeDynamic: 695 case JVM_CONSTANT_Fieldref: 696 case JVM_CONSTANT_Methodref: 697 case JVM_CONSTANT_InterfaceMethodref: { 698 const int name_and_type_ref_index = 699 cp->name_and_type_ref_index_at(index); 700 // already verified to be utf8 701 const int name_ref_index = 702 cp->name_ref_index_at(name_and_type_ref_index); 703 // already verified to be utf8 704 const int signature_ref_index = 705 cp->signature_ref_index_at(name_and_type_ref_index); 706 const Symbol* const name = cp->symbol_at(name_ref_index); 707 const Symbol* const signature = cp->symbol_at(signature_ref_index); 708 if (tag == JVM_CONSTANT_Fieldref) { 709 if (_need_verify) { 710 // Field name and signature are verified above, when iterating NameAndType_info. 711 // Need only to be sure signature is non-zero length and the right type. 712 if (signature->utf8_length() == 0 || 713 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 714 throwIllegalSignature("Field", name, signature, CHECK); 715 } 716 } 717 } else { 718 if (_need_verify) { 719 // Method name and signature are verified above, when iterating NameAndType_info. 720 // Need only to be sure signature is non-zero length and the right type. 721 if (signature->utf8_length() == 0 || 722 signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 723 throwIllegalSignature("Method", name, signature, CHECK); 724 } 725 } 726 // 4509014: If a class method name begins with '<', it must be "<init>" 727 const unsigned int name_len = name->utf8_length(); 728 if (tag == JVM_CONSTANT_Methodref && 729 name_len != 0 && 730 name->byte_at(0) == '<' && 731 name != vmSymbols::object_initializer_name()) { 732 classfile_parse_error( 733 "Bad method name at constant pool index %u in class file %s", 734 name_ref_index, CHECK); 735 } 736 } 737 break; 738 } 739 case JVM_CONSTANT_MethodHandle: { 740 const int ref_index = cp->method_handle_index_at(index); 741 const int ref_kind = cp->method_handle_ref_kind_at(index); 742 switch (ref_kind) { 743 case JVM_REF_invokeVirtual: 744 case JVM_REF_invokeStatic: 745 case JVM_REF_invokeSpecial: 746 case JVM_REF_newInvokeSpecial: { 747 const int name_and_type_ref_index = 748 cp->name_and_type_ref_index_at(ref_index); 749 const int name_ref_index = 750 cp->name_ref_index_at(name_and_type_ref_index); 751 const Symbol* const name = cp->symbol_at(name_ref_index); 752 if (ref_kind == JVM_REF_newInvokeSpecial) { 753 if (name != vmSymbols::object_initializer_name()) { 754 classfile_parse_error( 755 "Bad constructor name at constant pool index %u in class file %s", 756 name_ref_index, CHECK); 757 } 758 } else { 759 if (name == vmSymbols::object_initializer_name()) { 760 classfile_parse_error( 761 "Bad method name at constant pool index %u in class file %s", 762 name_ref_index, CHECK); 763 } 764 } 765 break; 766 } 767 // Other ref_kinds are already fully checked in previous pass. 768 } // switch(ref_kind) 769 break; 770 } 771 case JVM_CONSTANT_MethodType: { 772 const Symbol* const no_name = vmSymbols::type_name(); // place holder 773 const Symbol* const signature = cp->method_type_signature_at(index); 774 verify_legal_method_signature(no_name, signature, CHECK); 775 break; 776 } 777 case JVM_CONSTANT_Utf8: { 778 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 779 } 780 } // switch(tag) 781 } // end of for 782 } 783 784 Handle ClassFileParser::clear_cp_patch_at(int index) { 785 Handle patch = cp_patch_at(index); 786 _cp_patches->at_put(index, Handle()); 787 assert(!has_cp_patch_at(index), ""); 788 return patch; 789 } 790 791 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) { 792 int name_index = _orig_cp_size + _num_patched_klasses; 793 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses; 794 795 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name); 796 _num_patched_klasses ++; 797 } 798 799 void ClassFileParser::patch_constant_pool(ConstantPool* cp, 800 int index, 801 Handle patch, 802 TRAPS) { 803 assert(cp != NULL, "invariant"); 804 805 BasicType patch_type = T_VOID; 806 807 switch (cp->tag_at(index).value()) { 808 809 case JVM_CONSTANT_UnresolvedClass: { 810 // Patching a class means pre-resolving it. 811 // The name in the constant pool is ignored. 812 if (java_lang_Class::is_instance(patch())) { 813 guarantee_property(!java_lang_Class::is_primitive(patch()), 814 "Illegal class patch at %d in class file %s", 815 index, CHECK); 816 Klass* k = java_lang_Class::as_Klass(patch()); 817 patch_class(cp, index, k, k->name()); 818 } else { 819 guarantee_property(java_lang_String::is_instance(patch()), 820 "Illegal class patch at %d in class file %s", 821 index, CHECK); 822 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK); 823 patch_class(cp, index, NULL, name); 824 } 825 break; 826 } 827 828 case JVM_CONSTANT_String: { 829 // skip this patch and don't clear it. Needs the oop array for resolved 830 // references to be created first. 831 return; 832 } 833 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 834 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 835 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 836 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 837 patch_prim: 838 { 839 jvalue value; 840 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 841 guarantee_property(value_type == patch_type, 842 "Illegal primitive patch at %d in class file %s", 843 index, CHECK); 844 switch (value_type) { 845 case T_INT: cp->int_at_put(index, value.i); break; 846 case T_FLOAT: cp->float_at_put(index, value.f); break; 847 case T_LONG: cp->long_at_put(index, value.j); break; 848 case T_DOUBLE: cp->double_at_put(index, value.d); break; 849 default: assert(false, ""); 850 } 851 } // end patch_prim label 852 break; 853 854 default: { 855 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 856 guarantee_property(!has_cp_patch_at(index), 857 "Illegal unexpected patch at %d in class file %s", 858 index, CHECK); 859 return; 860 } 861 } // end of switch(tag) 862 863 // On fall-through, mark the patch as used. 864 clear_cp_patch_at(index); 865 } 866 class NameSigHash: public ResourceObj { 867 public: 868 const Symbol* _name; // name 869 const Symbol* _sig; // signature 870 NameSigHash* _next; // Next entry in hash table 871 }; 872 873 static const int HASH_ROW_SIZE = 256; 874 875 static unsigned int hash(const Symbol* name, const Symbol* sig) { 876 unsigned int raw_hash = 0; 877 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 878 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 879 880 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 881 } 882 883 884 static void initialize_hashtable(NameSigHash** table) { 885 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 886 } 887 // Return false if the name/sig combination is found in table. 888 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 889 // The old format checker uses heap sort to find duplicates. 890 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 891 // of table since we don't expect Symbol*'s to move. 892 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 893 assert(name != NULL, "name in constant pool is NULL"); 894 895 // First lookup for duplicates 896 int index = hash(name, sig); 897 NameSigHash* entry = table[index]; 898 while (entry != NULL) { 899 if (entry->_name == name && entry->_sig == sig) { 900 return false; 901 } 902 entry = entry->_next; 903 } 904 905 // No duplicate is found, allocate a new entry and fill it. 906 entry = new NameSigHash(); 907 entry->_name = name; 908 entry->_sig = sig; 909 910 // Insert into hash table 911 entry->_next = table[index]; 912 table[index] = entry; 913 914 return true; 915 } 916 917 // Side-effects: populates the _local_interfaces field 918 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 919 const int itfs_len, 920 ConstantPool* const cp, 921 bool* const has_nonstatic_concrete_methods, 922 TRAPS) { 923 assert(stream != NULL, "invariant"); 924 assert(cp != NULL, "invariant"); 925 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 926 927 if (itfs_len == 0) { 928 _local_interfaces = Universe::the_empty_klass_array(); 929 } else { 930 assert(itfs_len > 0, "only called for len>0"); 931 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK); 932 933 int index; 934 for (index = 0; index < itfs_len; index++) { 935 const u2 interface_index = stream->get_u2(CHECK); 936 Klass* interf; 937 check_property( 938 valid_klass_reference_at(interface_index), 939 "Interface name has bad constant pool index %u in class file %s", 940 interface_index, CHECK); 941 if (cp->tag_at(interface_index).is_klass()) { 942 interf = cp->resolved_klass_at(interface_index); 943 } else { 944 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 945 946 // Don't need to check legal name because it's checked when parsing constant pool. 947 // But need to make sure it's not an array type. 948 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 949 "Bad interface name in class file %s", CHECK); 950 951 // Call resolve_super so classcircularity is checked 952 interf = SystemDictionary::resolve_super_or_fail( 953 _class_name, 954 unresolved_klass, 955 Handle(THREAD, _loader_data->class_loader()), 956 _protection_domain, 957 false, 958 CHECK); 959 } 960 961 if (!interf->is_interface()) { 962 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 963 "Implementing class"); 964 } 965 966 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 967 *has_nonstatic_concrete_methods = true; 968 } 969 _local_interfaces->at_put(index, interf); 970 } 971 972 if (!_need_verify || itfs_len <= 1) { 973 return; 974 } 975 976 // Check if there's any duplicates in interfaces 977 ResourceMark rm(THREAD); 978 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 979 NameSigHash*, 980 HASH_ROW_SIZE); 981 initialize_hashtable(interface_names); 982 bool dup = false; 983 const Symbol* name = NULL; 984 { 985 debug_only(NoSafepointVerifier nsv;) 986 for (index = 0; index < itfs_len; index++) { 987 const Klass* const k = _local_interfaces->at(index); 988 name = InstanceKlass::cast(k)->name(); 989 // If no duplicates, add (name, NULL) in hashtable interface_names. 990 if (!put_after_lookup(name, NULL, interface_names)) { 991 dup = true; 992 break; 993 } 994 } 995 } 996 if (dup) { 997 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 998 name->as_C_string(), CHECK); 999 } 1000 } 1001 } 1002 1003 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1004 int constantvalue_index, 1005 int signature_index, 1006 TRAPS) const { 1007 // Make sure the constant pool entry is of a type appropriate to this field 1008 guarantee_property( 1009 (constantvalue_index > 0 && 1010 constantvalue_index < cp->length()), 1011 "Bad initial value index %u in ConstantValue attribute in class file %s", 1012 constantvalue_index, CHECK); 1013 1014 const constantTag value_type = cp->tag_at(constantvalue_index); 1015 switch(cp->basic_type_for_signature_at(signature_index)) { 1016 case T_LONG: { 1017 guarantee_property(value_type.is_long(), 1018 "Inconsistent constant value type in class file %s", 1019 CHECK); 1020 break; 1021 } 1022 case T_FLOAT: { 1023 guarantee_property(value_type.is_float(), 1024 "Inconsistent constant value type in class file %s", 1025 CHECK); 1026 break; 1027 } 1028 case T_DOUBLE: { 1029 guarantee_property(value_type.is_double(), 1030 "Inconsistent constant value type in class file %s", 1031 CHECK); 1032 break; 1033 } 1034 case T_BYTE: 1035 case T_CHAR: 1036 case T_SHORT: 1037 case T_BOOLEAN: 1038 case T_INT: { 1039 guarantee_property(value_type.is_int(), 1040 "Inconsistent constant value type in class file %s", 1041 CHECK); 1042 break; 1043 } 1044 case T_OBJECT: { 1045 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1046 && value_type.is_string()), 1047 "Bad string initial value in class file %s", 1048 CHECK); 1049 break; 1050 } 1051 default: { 1052 classfile_parse_error("Unable to set initial value %u in class file %s", 1053 constantvalue_index, 1054 CHECK); 1055 } 1056 } 1057 } 1058 1059 class AnnotationCollector : public ResourceObj{ 1060 public: 1061 enum Location { _in_field, _in_method, _in_class }; 1062 enum ID { 1063 _unknown = 0, 1064 _method_CallerSensitive, 1065 _method_ForceInline, 1066 _method_DontInline, 1067 _method_InjectedProfile, 1068 _method_LambdaForm_Compiled, 1069 _method_LambdaForm_Hidden, 1070 _method_HotSpotIntrinsicCandidate, 1071 _jdk_internal_vm_annotation_Contended, 1072 _field_Stable, 1073 _jdk_internal_vm_annotation_ReservedStackAccess, 1074 _annotation_LIMIT 1075 }; 1076 const Location _location; 1077 int _annotations_present; 1078 u2 _contended_group; 1079 1080 AnnotationCollector(Location location) 1081 : _location(location), _annotations_present(0) 1082 { 1083 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1084 } 1085 // If this annotation name has an ID, report it (or _none). 1086 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 1087 // Set the annotation name: 1088 void set_annotation(ID id) { 1089 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1090 _annotations_present |= nth_bit((int)id); 1091 } 1092 1093 void remove_annotation(ID id) { 1094 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1095 _annotations_present &= ~nth_bit((int)id); 1096 } 1097 1098 // Report if the annotation is present. 1099 bool has_any_annotations() const { return _annotations_present != 0; } 1100 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1101 1102 void set_contended_group(u2 group) { _contended_group = group; } 1103 u2 contended_group() const { return _contended_group; } 1104 1105 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1106 1107 void set_stable(bool stable) { set_annotation(_field_Stable); } 1108 bool is_stable() const { return has_annotation(_field_Stable); } 1109 }; 1110 1111 // This class also doubles as a holder for metadata cleanup. 1112 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1113 private: 1114 ClassLoaderData* _loader_data; 1115 AnnotationArray* _field_annotations; 1116 AnnotationArray* _field_type_annotations; 1117 public: 1118 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1119 AnnotationCollector(_in_field), 1120 _loader_data(loader_data), 1121 _field_annotations(NULL), 1122 _field_type_annotations(NULL) {} 1123 ~FieldAnnotationCollector(); 1124 void apply_to(FieldInfo* f); 1125 AnnotationArray* field_annotations() { return _field_annotations; } 1126 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1127 1128 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1129 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1130 }; 1131 1132 class MethodAnnotationCollector : public AnnotationCollector{ 1133 public: 1134 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1135 void apply_to(const methodHandle& m); 1136 }; 1137 1138 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1139 public: 1140 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1141 void apply_to(InstanceKlass* ik); 1142 }; 1143 1144 1145 static int skip_annotation_value(const u1*, int, int); // fwd decl 1146 1147 // Safely increment index by val if does not pass limit 1148 #define SAFE_ADD(index, limit, val) \ 1149 if (index >= limit - val) return limit; \ 1150 index += val; 1151 1152 // Skip an annotation. Return >=limit if there is any problem. 1153 static int skip_annotation(const u1* buffer, int limit, int index) { 1154 assert(buffer != NULL, "invariant"); 1155 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1156 // value := switch (tag:u1) { ... } 1157 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1158 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1159 while (--nmem >= 0 && index < limit) { 1160 SAFE_ADD(index, limit, 2); // skip member 1161 index = skip_annotation_value(buffer, limit, index); 1162 } 1163 return index; 1164 } 1165 1166 // Skip an annotation value. Return >=limit if there is any problem. 1167 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1168 assert(buffer != NULL, "invariant"); 1169 1170 // value := switch (tag:u1) { 1171 // case B, C, I, S, Z, D, F, J, c: con:u2; 1172 // case e: e_class:u2 e_name:u2; 1173 // case s: s_con:u2; 1174 // case [: do(nval:u2) {value}; 1175 // case @: annotation; 1176 // case s: s_con:u2; 1177 // } 1178 SAFE_ADD(index, limit, 1); // read tag 1179 const u1 tag = buffer[index - 1]; 1180 switch (tag) { 1181 case 'B': 1182 case 'C': 1183 case 'I': 1184 case 'S': 1185 case 'Z': 1186 case 'D': 1187 case 'F': 1188 case 'J': 1189 case 'c': 1190 case 's': 1191 SAFE_ADD(index, limit, 2); // skip con or s_con 1192 break; 1193 case 'e': 1194 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1195 break; 1196 case '[': 1197 { 1198 SAFE_ADD(index, limit, 2); // read nval 1199 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1200 while (--nval >= 0 && index < limit) { 1201 index = skip_annotation_value(buffer, limit, index); 1202 } 1203 } 1204 break; 1205 case '@': 1206 index = skip_annotation(buffer, limit, index); 1207 break; 1208 default: 1209 return limit; // bad tag byte 1210 } 1211 return index; 1212 } 1213 1214 // Sift through annotations, looking for those significant to the VM: 1215 static void parse_annotations(const ConstantPool* const cp, 1216 const u1* buffer, int limit, 1217 AnnotationCollector* coll, 1218 ClassLoaderData* loader_data, 1219 TRAPS) { 1220 1221 assert(cp != NULL, "invariant"); 1222 assert(buffer != NULL, "invariant"); 1223 assert(coll != NULL, "invariant"); 1224 assert(loader_data != NULL, "invariant"); 1225 1226 // annotations := do(nann:u2) {annotation} 1227 int index = 2; // read nann 1228 if (index >= limit) return; 1229 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1230 enum { // initial annotation layout 1231 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1232 count_off = 2, // u2 such as 1 (one value) 1233 member_off = 4, // utf8 such as 'value' 1234 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1235 e_tag_val = 'e', 1236 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1237 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1238 e_size = 11, // end of 'e' annotation 1239 c_tag_val = 'c', // payload is type 1240 c_con_off = 7, // utf8 payload, such as 'I' 1241 c_size = 9, // end of 'c' annotation 1242 s_tag_val = 's', // payload is String 1243 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1244 s_size = 9, 1245 min_size = 6 // smallest possible size (zero members) 1246 }; 1247 // Cannot add min_size to index in case of overflow MAX_INT 1248 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1249 int index0 = index; 1250 index = skip_annotation(buffer, limit, index); 1251 const u1* const abase = buffer + index0; 1252 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1253 const int count = Bytes::get_Java_u2((address)abase + count_off); 1254 const Symbol* const aname = check_symbol_at(cp, atype); 1255 if (aname == NULL) break; // invalid annotation name 1256 const Symbol* member = NULL; 1257 if (count >= 1) { 1258 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1259 member = check_symbol_at(cp, member_index); 1260 if (member == NULL) break; // invalid member name 1261 } 1262 1263 // Here is where parsing particular annotations will take place. 1264 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1265 if (AnnotationCollector::_unknown == id) continue; 1266 coll->set_annotation(id); 1267 1268 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1269 // @Contended can optionally specify the contention group. 1270 // 1271 // Contended group defines the equivalence class over the fields: 1272 // the fields within the same contended group are not treated distinct. 1273 // The only exception is default group, which does not incur the 1274 // equivalence. Naturally, contention group for classes is meaningless. 1275 // 1276 // While the contention group is specified as String, annotation 1277 // values are already interned, and we might as well use the constant 1278 // pool index as the group tag. 1279 // 1280 u2 group_index = 0; // default contended group 1281 if (count == 1 1282 && s_size == (index - index0) // match size 1283 && s_tag_val == *(abase + tag_off) 1284 && member == vmSymbols::value_name()) { 1285 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1286 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1287 group_index = 0; // default contended group 1288 } 1289 } 1290 coll->set_contended_group(group_index); 1291 } 1292 } 1293 } 1294 1295 1296 // Parse attributes for a field. 1297 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1298 u2 attributes_count, 1299 bool is_static, u2 signature_index, 1300 u2* const constantvalue_index_addr, 1301 bool* const is_synthetic_addr, 1302 u2* const generic_signature_index_addr, 1303 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1304 TRAPS) { 1305 assert(cfs != NULL, "invariant"); 1306 assert(constantvalue_index_addr != NULL, "invariant"); 1307 assert(is_synthetic_addr != NULL, "invariant"); 1308 assert(generic_signature_index_addr != NULL, "invariant"); 1309 assert(parsed_annotations != NULL, "invariant"); 1310 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1311 1312 u2 constantvalue_index = 0; 1313 u2 generic_signature_index = 0; 1314 bool is_synthetic = false; 1315 const u1* runtime_visible_annotations = NULL; 1316 int runtime_visible_annotations_length = 0; 1317 const u1* runtime_invisible_annotations = NULL; 1318 int runtime_invisible_annotations_length = 0; 1319 const u1* runtime_visible_type_annotations = NULL; 1320 int runtime_visible_type_annotations_length = 0; 1321 const u1* runtime_invisible_type_annotations = NULL; 1322 int runtime_invisible_type_annotations_length = 0; 1323 bool runtime_invisible_annotations_exists = false; 1324 bool runtime_invisible_type_annotations_exists = false; 1325 const ConstantPool* const cp = _cp; 1326 1327 while (attributes_count--) { 1328 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1329 const u2 attribute_name_index = cfs->get_u2_fast(); 1330 const u4 attribute_length = cfs->get_u4_fast(); 1331 check_property(valid_symbol_at(attribute_name_index), 1332 "Invalid field attribute index %u in class file %s", 1333 attribute_name_index, 1334 CHECK); 1335 1336 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1337 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1338 // ignore if non-static 1339 if (constantvalue_index != 0) { 1340 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1341 } 1342 check_property( 1343 attribute_length == 2, 1344 "Invalid ConstantValue field attribute length %u in class file %s", 1345 attribute_length, CHECK); 1346 1347 constantvalue_index = cfs->get_u2(CHECK); 1348 if (_need_verify) { 1349 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1350 } 1351 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1352 if (attribute_length != 0) { 1353 classfile_parse_error( 1354 "Invalid Synthetic field attribute length %u in class file %s", 1355 attribute_length, CHECK); 1356 } 1357 is_synthetic = true; 1358 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1359 if (attribute_length != 0) { 1360 classfile_parse_error( 1361 "Invalid Deprecated field attribute length %u in class file %s", 1362 attribute_length, CHECK); 1363 } 1364 } else if (_major_version >= JAVA_1_5_VERSION) { 1365 if (attribute_name == vmSymbols::tag_signature()) { 1366 if (generic_signature_index != 0) { 1367 classfile_parse_error( 1368 "Multiple Signature attributes for field in class file %s", CHECK); 1369 } 1370 if (attribute_length != 2) { 1371 classfile_parse_error( 1372 "Wrong size %u for field's Signature attribute in class file %s", 1373 attribute_length, CHECK); 1374 } 1375 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1376 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1377 if (runtime_visible_annotations != NULL) { 1378 classfile_parse_error( 1379 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1380 } 1381 runtime_visible_annotations_length = attribute_length; 1382 runtime_visible_annotations = cfs->current(); 1383 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1384 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1385 parse_annotations(cp, 1386 runtime_visible_annotations, 1387 runtime_visible_annotations_length, 1388 parsed_annotations, 1389 _loader_data, 1390 CHECK); 1391 cfs->skip_u1_fast(runtime_visible_annotations_length); 1392 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1393 if (runtime_invisible_annotations_exists) { 1394 classfile_parse_error( 1395 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1396 } 1397 runtime_invisible_annotations_exists = true; 1398 if (PreserveAllAnnotations) { 1399 runtime_invisible_annotations_length = attribute_length; 1400 runtime_invisible_annotations = cfs->current(); 1401 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1402 } 1403 cfs->skip_u1(attribute_length, CHECK); 1404 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1405 if (runtime_visible_type_annotations != NULL) { 1406 classfile_parse_error( 1407 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1408 } 1409 runtime_visible_type_annotations_length = attribute_length; 1410 runtime_visible_type_annotations = cfs->current(); 1411 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1412 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1413 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1414 if (runtime_invisible_type_annotations_exists) { 1415 classfile_parse_error( 1416 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1417 } else { 1418 runtime_invisible_type_annotations_exists = true; 1419 } 1420 if (PreserveAllAnnotations) { 1421 runtime_invisible_type_annotations_length = attribute_length; 1422 runtime_invisible_type_annotations = cfs->current(); 1423 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1424 } 1425 cfs->skip_u1(attribute_length, CHECK); 1426 } else { 1427 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1428 } 1429 } else { 1430 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1431 } 1432 } 1433 1434 *constantvalue_index_addr = constantvalue_index; 1435 *is_synthetic_addr = is_synthetic; 1436 *generic_signature_index_addr = generic_signature_index; 1437 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1438 runtime_visible_annotations_length, 1439 runtime_invisible_annotations, 1440 runtime_invisible_annotations_length, 1441 CHECK); 1442 parsed_annotations->set_field_annotations(a); 1443 a = assemble_annotations(runtime_visible_type_annotations, 1444 runtime_visible_type_annotations_length, 1445 runtime_invisible_type_annotations, 1446 runtime_invisible_type_annotations_length, 1447 CHECK); 1448 parsed_annotations->set_field_type_annotations(a); 1449 return; 1450 } 1451 1452 1453 // Field allocation types. Used for computing field offsets. 1454 1455 enum FieldAllocationType { 1456 STATIC_OOP, // Oops 1457 STATIC_BYTE, // Boolean, Byte, char 1458 STATIC_SHORT, // shorts 1459 STATIC_WORD, // ints 1460 STATIC_DOUBLE, // aligned long or double 1461 STATIC_FLATTENABLE, // flattenable field 1462 NONSTATIC_OOP, 1463 NONSTATIC_BYTE, 1464 NONSTATIC_SHORT, 1465 NONSTATIC_WORD, 1466 NONSTATIC_DOUBLE, 1467 NONSTATIC_FLATTENABLE, 1468 MAX_FIELD_ALLOCATION_TYPE, 1469 BAD_ALLOCATION_TYPE = -1 1470 }; 1471 1472 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1473 BAD_ALLOCATION_TYPE, // 0 1474 BAD_ALLOCATION_TYPE, // 1 1475 BAD_ALLOCATION_TYPE, // 2 1476 BAD_ALLOCATION_TYPE, // 3 1477 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1478 NONSTATIC_SHORT, // T_CHAR = 5, 1479 NONSTATIC_WORD, // T_FLOAT = 6, 1480 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1481 NONSTATIC_BYTE, // T_BYTE = 8, 1482 NONSTATIC_SHORT, // T_SHORT = 9, 1483 NONSTATIC_WORD, // T_INT = 10, 1484 NONSTATIC_DOUBLE, // T_LONG = 11, 1485 NONSTATIC_OOP, // T_OBJECT = 12, 1486 NONSTATIC_OOP, // T_ARRAY = 13, 1487 NONSTATIC_OOP, // T_VALUETYPE = 14, 1488 BAD_ALLOCATION_TYPE, // T_VOID = 15, 1489 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16, 1490 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17, 1491 BAD_ALLOCATION_TYPE, // T_METADATA = 18, 1492 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19, 1493 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20, 1494 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21, 1495 BAD_ALLOCATION_TYPE, // 0 1496 BAD_ALLOCATION_TYPE, // 1 1497 BAD_ALLOCATION_TYPE, // 2 1498 BAD_ALLOCATION_TYPE, // 3 1499 STATIC_BYTE , // T_BOOLEAN = 4, 1500 STATIC_SHORT, // T_CHAR = 5, 1501 STATIC_WORD, // T_FLOAT = 6, 1502 STATIC_DOUBLE, // T_DOUBLE = 7, 1503 STATIC_BYTE, // T_BYTE = 8, 1504 STATIC_SHORT, // T_SHORT = 9, 1505 STATIC_WORD, // T_INT = 10, 1506 STATIC_DOUBLE, // T_LONG = 11, 1507 STATIC_OOP, // T_OBJECT = 12, 1508 STATIC_OOP, // T_ARRAY = 13, 1509 STATIC_OOP, // T_VALUETYPE = 14, 1510 BAD_ALLOCATION_TYPE, // T_VOID = 15, 1511 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16, 1512 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17, 1513 BAD_ALLOCATION_TYPE, // T_METADATA = 18, 1514 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19, 1515 BAD_ALLOCATION_TYPE, // T_VALUETYPEPTR= 20, 1516 BAD_ALLOCATION_TYPE, // T_CONFLICT = 21, 1517 }; 1518 1519 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_flattenable) { 1520 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1521 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1522 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1523 if (is_flattenable) { 1524 result = is_static ? STATIC_FLATTENABLE : NONSTATIC_FLATTENABLE; 1525 } 1526 return result; 1527 } 1528 1529 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1530 public: 1531 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1532 1533 FieldAllocationCount() { 1534 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1535 count[i] = 0; 1536 } 1537 } 1538 1539 FieldAllocationType update(bool is_static, BasicType type, bool is_flattenable) { 1540 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_flattenable); 1541 if (atype != BAD_ALLOCATION_TYPE) { 1542 // Make sure there is no overflow with injected fields. 1543 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1544 count[atype]++; 1545 } 1546 return atype; 1547 } 1548 }; 1549 1550 // Side-effects: populates the _fields, _fields_annotations, 1551 // _fields_type_annotations fields 1552 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1553 bool is_interface, 1554 bool is_value_type, 1555 FieldAllocationCount* const fac, 1556 ConstantPool* cp, 1557 const int cp_size, 1558 u2* const java_fields_count_ptr, 1559 TRAPS) { 1560 1561 assert(cfs != NULL, "invariant"); 1562 assert(fac != NULL, "invariant"); 1563 assert(cp != NULL, "invariant"); 1564 assert(java_fields_count_ptr != NULL, "invariant"); 1565 1566 assert(NULL == _fields, "invariant"); 1567 assert(NULL == _fields_annotations, "invariant"); 1568 assert(NULL == _fields_type_annotations, "invariant"); 1569 1570 cfs->guarantee_more(2, CHECK); // length 1571 const u2 length = cfs->get_u2_fast(); 1572 *java_fields_count_ptr = length; 1573 1574 int num_injected = 0; 1575 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1576 &num_injected); 1577 1578 const int total_fields = length + num_injected + (is_value_type ? 1 : 0); 1579 1580 // The field array starts with tuples of shorts 1581 // [access, name index, sig index, initial value index, byte offset]. 1582 // A generic signature slot only exists for field with generic 1583 // signature attribute. And the access flag is set with 1584 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1585 // signature slots are at the end of the field array and after all 1586 // other fields data. 1587 // 1588 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1589 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1590 // ... 1591 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1592 // [generic signature index] 1593 // [generic signature index] 1594 // ... 1595 // 1596 // Allocate a temporary resource array for field data. For each field, 1597 // a slot is reserved in the temporary array for the generic signature 1598 // index. After parsing all fields, the data are copied to a permanent 1599 // array and any unused slots will be discarded. 1600 ResourceMark rm(THREAD); 1601 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1602 u2, 1603 total_fields * (FieldInfo::field_slots + 1)); 1604 1605 // The generic signature slots start after all other fields' data. 1606 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1607 int num_generic_signature = 0; 1608 for (int n = 0; n < length; n++) { 1609 // access_flags, name_index, descriptor_index, attributes_count 1610 cfs->guarantee_more(8, CHECK); 1611 1612 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS; 1613 // JVM_ACC_FLATTENABLE is defined for class file version 55 and later 1614 if (supports_value_types()) { 1615 recognized_modifiers |= JVM_ACC_FLATTENABLE; 1616 } 1617 1618 const jint flags = cfs->get_u2_fast() & recognized_modifiers; 1619 verify_legal_field_modifiers(flags, is_interface, is_value_type, CHECK); 1620 AccessFlags access_flags; 1621 access_flags.set_flags(flags); 1622 1623 const u2 name_index = cfs->get_u2_fast(); 1624 check_property(valid_symbol_at(name_index), 1625 "Invalid constant pool index %u for field name in class file %s", 1626 name_index, CHECK); 1627 const Symbol* const name = cp->symbol_at(name_index); 1628 verify_legal_field_name(name, CHECK); 1629 1630 const u2 signature_index = cfs->get_u2_fast(); 1631 check_property(valid_symbol_at(signature_index), 1632 "Invalid constant pool index %u for field signature in class file %s", 1633 signature_index, CHECK); 1634 const Symbol* const sig = cp->symbol_at(signature_index); 1635 verify_legal_field_signature(name, sig, CHECK); 1636 if (access_flags.is_flattenable()) { 1637 // Array flattenability cannot be specified. Arrays of value classes are 1638 // are always flattenable. Arrays of other classes are not flattenable. 1639 if (sig->utf8_length() > 1 && sig->byte_at(0) == '[') { 1640 classfile_parse_error( 1641 "Field \"%s\" with signature \"%s\" in class file %s is invalid." 1642 " ACC_FLATTENABLE cannot be specified for an array", 1643 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1644 } 1645 _has_flattenable_fields = true; 1646 } 1647 1648 u2 constantvalue_index = 0; 1649 bool is_synthetic = false; 1650 u2 generic_signature_index = 0; 1651 const bool is_static = access_flags.is_static(); 1652 FieldAnnotationCollector parsed_annotations(_loader_data); 1653 1654 const u2 attributes_count = cfs->get_u2_fast(); 1655 if (attributes_count > 0) { 1656 parse_field_attributes(cfs, 1657 attributes_count, 1658 is_static, 1659 signature_index, 1660 &constantvalue_index, 1661 &is_synthetic, 1662 &generic_signature_index, 1663 &parsed_annotations, 1664 CHECK); 1665 1666 if (parsed_annotations.field_annotations() != NULL) { 1667 if (_fields_annotations == NULL) { 1668 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1669 _loader_data, length, NULL, 1670 CHECK); 1671 } 1672 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1673 parsed_annotations.set_field_annotations(NULL); 1674 } 1675 if (parsed_annotations.field_type_annotations() != NULL) { 1676 if (_fields_type_annotations == NULL) { 1677 _fields_type_annotations = 1678 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1679 length, 1680 NULL, 1681 CHECK); 1682 } 1683 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1684 parsed_annotations.set_field_type_annotations(NULL); 1685 } 1686 1687 if (is_synthetic) { 1688 access_flags.set_is_synthetic(); 1689 } 1690 if (generic_signature_index != 0) { 1691 access_flags.set_field_has_generic_signature(); 1692 fa[generic_signature_slot] = generic_signature_index; 1693 generic_signature_slot ++; 1694 num_generic_signature ++; 1695 } 1696 } 1697 1698 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1699 field->initialize(access_flags.as_short(), 1700 name_index, 1701 signature_index, 1702 constantvalue_index); 1703 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1704 1705 // Remember how many oops we encountered and compute allocation type 1706 const FieldAllocationType atype = fac->update(is_static, type, access_flags.is_flattenable()); 1707 field->set_allocation_type(atype); 1708 1709 // After field is initialized with type, we can augment it with aux info 1710 if (parsed_annotations.has_any_annotations()) 1711 parsed_annotations.apply_to(field); 1712 } 1713 1714 int index = length; 1715 if (num_injected != 0) { 1716 for (int n = 0; n < num_injected; n++) { 1717 // Check for duplicates 1718 if (injected[n].may_be_java) { 1719 const Symbol* const name = injected[n].name(); 1720 const Symbol* const signature = injected[n].signature(); 1721 bool duplicate = false; 1722 for (int i = 0; i < length; i++) { 1723 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1724 if (name == cp->symbol_at(f->name_index()) && 1725 signature == cp->symbol_at(f->signature_index())) { 1726 // Symbol is desclared in Java so skip this one 1727 duplicate = true; 1728 break; 1729 } 1730 } 1731 if (duplicate) { 1732 // These will be removed from the field array at the end 1733 continue; 1734 } 1735 } 1736 1737 // Injected field 1738 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1739 field->initialize(JVM_ACC_FIELD_INTERNAL, 1740 injected[n].name_index, 1741 injected[n].signature_index, 1742 0); 1743 1744 const BasicType type = FieldType::basic_type(injected[n].signature()); 1745 1746 // Remember how many oops we encountered and compute allocation type 1747 const FieldAllocationType atype = fac->update(false, type, false); 1748 field->set_allocation_type(atype); 1749 index++; 1750 } 1751 } 1752 1753 if (is_value_type) { 1754 index = length + num_injected; 1755 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1756 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC, 1757 vmSymbols::default_value_name_enum, 1758 vmSymbols::java_lang_Object_enum, 1759 0); 1760 const BasicType type = FieldType::basic_type(vmSymbols::object_signature()); 1761 const FieldAllocationType atype = fac->update(true, type, false); 1762 field->set_allocation_type(atype); 1763 index++; 1764 } 1765 1766 assert(NULL == _fields, "invariant"); 1767 1768 _fields = 1769 MetadataFactory::new_array<u2>(_loader_data, 1770 index * FieldInfo::field_slots + num_generic_signature, 1771 CHECK); 1772 // Sometimes injected fields already exist in the Java source so 1773 // the fields array could be too long. In that case the 1774 // fields array is trimed. Also unused slots that were reserved 1775 // for generic signature indexes are discarded. 1776 { 1777 int i = 0; 1778 for (; i < index * FieldInfo::field_slots; i++) { 1779 _fields->at_put(i, fa[i]); 1780 } 1781 for (int j = total_fields * FieldInfo::field_slots; 1782 j < generic_signature_slot; j++) { 1783 _fields->at_put(i++, fa[j]); 1784 } 1785 assert(_fields->length() == i, ""); 1786 } 1787 1788 if (_need_verify && length > 1) { 1789 // Check duplicated fields 1790 ResourceMark rm(THREAD); 1791 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1792 THREAD, NameSigHash*, HASH_ROW_SIZE); 1793 initialize_hashtable(names_and_sigs); 1794 bool dup = false; 1795 const Symbol* name = NULL; 1796 const Symbol* sig = NULL; 1797 { 1798 debug_only(NoSafepointVerifier nsv;) 1799 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1800 name = fs.name(); 1801 sig = fs.signature(); 1802 // If no duplicates, add name/signature in hashtable names_and_sigs. 1803 if (!put_after_lookup(name, sig, names_and_sigs)) { 1804 dup = true; 1805 break; 1806 } 1807 } 1808 } 1809 if (dup) { 1810 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1811 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1812 } 1813 } 1814 } 1815 1816 1817 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1818 u4 code_length, 1819 u4 exception_table_length, 1820 TRAPS) { 1821 assert(cfs != NULL, "invariant"); 1822 1823 const unsafe_u2* const exception_table_start = cfs->current(); 1824 assert(exception_table_start != NULL, "null exception table"); 1825 1826 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1827 // end_pc, 1828 // handler_pc, 1829 // catch_type_index 1830 1831 // Will check legal target after parsing code array in verifier. 1832 if (_need_verify) { 1833 for (unsigned int i = 0; i < exception_table_length; i++) { 1834 const u2 start_pc = cfs->get_u2_fast(); 1835 const u2 end_pc = cfs->get_u2_fast(); 1836 const u2 handler_pc = cfs->get_u2_fast(); 1837 const u2 catch_type_index = cfs->get_u2_fast(); 1838 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1839 "Illegal exception table range in class file %s", 1840 CHECK_NULL); 1841 guarantee_property(handler_pc < code_length, 1842 "Illegal exception table handler in class file %s", 1843 CHECK_NULL); 1844 if (catch_type_index != 0) { 1845 guarantee_property(valid_klass_reference_at(catch_type_index), 1846 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1847 } 1848 } 1849 } else { 1850 cfs->skip_u2_fast(exception_table_length * 4); 1851 } 1852 return exception_table_start; 1853 } 1854 1855 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1856 u4 code_length, 1857 CompressedLineNumberWriteStream**const write_stream, 1858 TRAPS) { 1859 1860 const ClassFileStream* const cfs = _stream; 1861 unsigned int num_entries = cfs->get_u2(CHECK); 1862 1863 // Each entry is a u2 start_pc, and a u2 line_number 1864 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1865 1866 // Verify line number attribute and table length 1867 check_property( 1868 code_attribute_length == sizeof(u2) + length_in_bytes, 1869 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1870 1871 cfs->guarantee_more(length_in_bytes, CHECK); 1872 1873 if ((*write_stream) == NULL) { 1874 if (length_in_bytes > fixed_buffer_size) { 1875 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1876 } else { 1877 (*write_stream) = new CompressedLineNumberWriteStream( 1878 _linenumbertable_buffer, fixed_buffer_size); 1879 } 1880 } 1881 1882 while (num_entries-- > 0) { 1883 const u2 bci = cfs->get_u2_fast(); // start_pc 1884 const u2 line = cfs->get_u2_fast(); // line_number 1885 guarantee_property(bci < code_length, 1886 "Invalid pc in LineNumberTable in class file %s", CHECK); 1887 (*write_stream)->write_pair(bci, line); 1888 } 1889 } 1890 1891 1892 class LVT_Hash : public AllStatic { 1893 public: 1894 1895 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1896 /* 1897 * 3-tuple start_bci/length/slot has to be unique key, 1898 * so the following comparison seems to be redundant: 1899 * && elem->name_cp_index == entry->_elem->name_cp_index 1900 */ 1901 return (e0.start_bci == e1.start_bci && 1902 e0.length == e1.length && 1903 e0.name_cp_index == e1.name_cp_index && 1904 e0.slot == e1.slot); 1905 } 1906 1907 static unsigned int hash(LocalVariableTableElement const& e0) { 1908 unsigned int raw_hash = e0.start_bci; 1909 1910 raw_hash = e0.length + raw_hash * 37; 1911 raw_hash = e0.name_cp_index + raw_hash * 37; 1912 raw_hash = e0.slot + raw_hash * 37; 1913 1914 return raw_hash; 1915 } 1916 }; 1917 1918 1919 // Class file LocalVariableTable elements. 1920 class Classfile_LVT_Element { 1921 public: 1922 u2 start_bci; 1923 u2 length; 1924 u2 name_cp_index; 1925 u2 descriptor_cp_index; 1926 u2 slot; 1927 }; 1928 1929 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1930 LocalVariableTableElement* const lvt) { 1931 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1932 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1933 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1934 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1935 lvt->signature_cp_index = 0; 1936 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1937 } 1938 1939 // Function is used to parse both attributes: 1940 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1941 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1942 u4 code_length, 1943 u2 max_locals, 1944 u4 code_attribute_length, 1945 u2* const localvariable_table_length, 1946 bool isLVTT, 1947 TRAPS) { 1948 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1949 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1950 const unsigned int size = 1951 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1952 1953 const ConstantPool* const cp = _cp; 1954 1955 // Verify local variable table attribute has right length 1956 if (_need_verify) { 1957 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1958 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1959 } 1960 1961 const unsafe_u2* const localvariable_table_start = cfs->current(); 1962 assert(localvariable_table_start != NULL, "null local variable table"); 1963 if (!_need_verify) { 1964 cfs->skip_u2_fast(size); 1965 } else { 1966 cfs->guarantee_more(size * 2, CHECK_NULL); 1967 for(int i = 0; i < (*localvariable_table_length); i++) { 1968 const u2 start_pc = cfs->get_u2_fast(); 1969 const u2 length = cfs->get_u2_fast(); 1970 const u2 name_index = cfs->get_u2_fast(); 1971 const u2 descriptor_index = cfs->get_u2_fast(); 1972 const u2 index = cfs->get_u2_fast(); 1973 // Assign to a u4 to avoid overflow 1974 const u4 end_pc = (u4)start_pc + (u4)length; 1975 1976 if (start_pc >= code_length) { 1977 classfile_parse_error( 1978 "Invalid start_pc %u in %s in class file %s", 1979 start_pc, tbl_name, CHECK_NULL); 1980 } 1981 if (end_pc > code_length) { 1982 classfile_parse_error( 1983 "Invalid length %u in %s in class file %s", 1984 length, tbl_name, CHECK_NULL); 1985 } 1986 const int cp_size = cp->length(); 1987 guarantee_property(valid_symbol_at(name_index), 1988 "Name index %u in %s has bad constant type in class file %s", 1989 name_index, tbl_name, CHECK_NULL); 1990 guarantee_property(valid_symbol_at(descriptor_index), 1991 "Signature index %u in %s has bad constant type in class file %s", 1992 descriptor_index, tbl_name, CHECK_NULL); 1993 1994 const Symbol* const name = cp->symbol_at(name_index); 1995 const Symbol* const sig = cp->symbol_at(descriptor_index); 1996 verify_legal_field_name(name, CHECK_NULL); 1997 u2 extra_slot = 0; 1998 if (!isLVTT) { 1999 verify_legal_field_signature(name, sig, CHECK_NULL); 2000 2001 // 4894874: check special cases for double and long local variables 2002 if (sig == vmSymbols::type_signature(T_DOUBLE) || 2003 sig == vmSymbols::type_signature(T_LONG)) { 2004 extra_slot = 1; 2005 } 2006 } 2007 guarantee_property((index + extra_slot) < max_locals, 2008 "Invalid index %u in %s in class file %s", 2009 index, tbl_name, CHECK_NULL); 2010 } 2011 } 2012 return localvariable_table_start; 2013 } 2014 2015 2016 void ClassFileParser::parse_type_array(u2 array_length, 2017 u4 code_length, 2018 u4* const u1_index, 2019 u4* const u2_index, 2020 u1* const u1_array, 2021 u2* const u2_array, 2022 TRAPS) { 2023 const ClassFileStream* const cfs = _stream; 2024 u2 index = 0; // index in the array with long/double occupying two slots 2025 u4 i1 = *u1_index; 2026 u4 i2 = *u2_index + 1; 2027 for(int i = 0; i < array_length; i++) { 2028 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 2029 index++; 2030 if (tag == ITEM_Long || tag == ITEM_Double) { 2031 index++; 2032 } else if (tag == ITEM_Object) { 2033 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 2034 guarantee_property(valid_klass_reference_at(class_index), 2035 "Bad class index %u in StackMap in class file %s", 2036 class_index, CHECK); 2037 } else if (tag == ITEM_Uninitialized) { 2038 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 2039 guarantee_property( 2040 offset < code_length, 2041 "Bad uninitialized type offset %u in StackMap in class file %s", 2042 offset, CHECK); 2043 } else { 2044 guarantee_property( 2045 tag <= (u1)ITEM_Uninitialized, 2046 "Unknown variable type %u in StackMap in class file %s", 2047 tag, CHECK); 2048 } 2049 } 2050 u2_array[*u2_index] = index; 2051 *u1_index = i1; 2052 *u2_index = i2; 2053 } 2054 2055 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 2056 u4 code_attribute_length, 2057 bool need_verify, 2058 TRAPS) { 2059 assert(cfs != NULL, "invariant"); 2060 2061 if (0 == code_attribute_length) { 2062 return NULL; 2063 } 2064 2065 const u1* const stackmap_table_start = cfs->current(); 2066 assert(stackmap_table_start != NULL, "null stackmap table"); 2067 2068 // check code_attribute_length first 2069 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2070 2071 if (!need_verify && !DumpSharedSpaces) { 2072 return NULL; 2073 } 2074 return stackmap_table_start; 2075 } 2076 2077 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2078 u2* const checked_exceptions_length, 2079 u4 method_attribute_length, 2080 TRAPS) { 2081 assert(cfs != NULL, "invariant"); 2082 assert(checked_exceptions_length != NULL, "invariant"); 2083 2084 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2085 *checked_exceptions_length = cfs->get_u2_fast(); 2086 const unsigned int size = 2087 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2088 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2089 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2090 if (!_need_verify) { 2091 cfs->skip_u2_fast(size); 2092 } else { 2093 // Verify each value in the checked exception table 2094 u2 checked_exception; 2095 const u2 len = *checked_exceptions_length; 2096 cfs->guarantee_more(2 * len, CHECK_NULL); 2097 for (int i = 0; i < len; i++) { 2098 checked_exception = cfs->get_u2_fast(); 2099 check_property( 2100 valid_klass_reference_at(checked_exception), 2101 "Exception name has bad type at constant pool %u in class file %s", 2102 checked_exception, CHECK_NULL); 2103 } 2104 } 2105 // check exceptions attribute length 2106 if (_need_verify) { 2107 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2108 sizeof(u2) * size), 2109 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2110 } 2111 return checked_exceptions_start; 2112 } 2113 2114 void ClassFileParser::throwIllegalSignature(const char* type, 2115 const Symbol* name, 2116 const Symbol* sig, 2117 TRAPS) const { 2118 assert(name != NULL, "invariant"); 2119 assert(sig != NULL, "invariant"); 2120 2121 ResourceMark rm(THREAD); 2122 Exceptions::fthrow(THREAD_AND_LOCATION, 2123 vmSymbols::java_lang_ClassFormatError(), 2124 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2125 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2126 } 2127 2128 AnnotationCollector::ID 2129 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2130 const Symbol* name) { 2131 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2132 // Privileged code can use all annotations. Other code silently drops some. 2133 const bool privileged = loader_data->is_the_null_class_loader_data() || 2134 loader_data->is_platform_class_loader_data() || 2135 loader_data->is_anonymous(); 2136 switch (sid) { 2137 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2138 if (_location != _in_method) break; // only allow for methods 2139 if (!privileged) break; // only allow in privileged code 2140 return _method_CallerSensitive; 2141 } 2142 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2143 if (_location != _in_method) break; // only allow for methods 2144 if (!privileged) break; // only allow in privileged code 2145 return _method_ForceInline; 2146 } 2147 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2148 if (_location != _in_method) break; // only allow for methods 2149 if (!privileged) break; // only allow in privileged code 2150 return _method_DontInline; 2151 } 2152 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2153 if (_location != _in_method) break; // only allow for methods 2154 if (!privileged) break; // only allow in privileged code 2155 return _method_InjectedProfile; 2156 } 2157 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2158 if (_location != _in_method) break; // only allow for methods 2159 if (!privileged) break; // only allow in privileged code 2160 return _method_LambdaForm_Compiled; 2161 } 2162 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): { 2163 if (_location != _in_method) break; // only allow for methods 2164 if (!privileged) break; // only allow in privileged code 2165 return _method_LambdaForm_Hidden; 2166 } 2167 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2168 if (_location != _in_method) break; // only allow for methods 2169 if (!privileged) break; // only allow in privileged code 2170 return _method_HotSpotIntrinsicCandidate; 2171 } 2172 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2173 if (_location != _in_field) break; // only allow for fields 2174 if (!privileged) break; // only allow in privileged code 2175 return _field_Stable; 2176 } 2177 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2178 if (_location != _in_field && _location != _in_class) { 2179 break; // only allow for fields and classes 2180 } 2181 if (!EnableContended || (RestrictContended && !privileged)) { 2182 break; // honor privileges 2183 } 2184 return _jdk_internal_vm_annotation_Contended; 2185 } 2186 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2187 if (_location != _in_method) break; // only allow for methods 2188 if (RestrictReservedStack && !privileged) break; // honor privileges 2189 return _jdk_internal_vm_annotation_ReservedStackAccess; 2190 } 2191 default: { 2192 break; 2193 } 2194 } 2195 return AnnotationCollector::_unknown; 2196 } 2197 2198 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2199 if (is_contended()) 2200 f->set_contended_group(contended_group()); 2201 if (is_stable()) 2202 f->set_stable(true); 2203 } 2204 2205 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2206 // If there's an error deallocate metadata for field annotations 2207 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2208 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2209 } 2210 2211 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2212 if (has_annotation(_method_CallerSensitive)) 2213 m->set_caller_sensitive(true); 2214 if (has_annotation(_method_ForceInline)) 2215 m->set_force_inline(true); 2216 if (has_annotation(_method_DontInline)) 2217 m->set_dont_inline(true); 2218 if (has_annotation(_method_InjectedProfile)) 2219 m->set_has_injected_profile(true); 2220 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2221 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2222 if (has_annotation(_method_LambdaForm_Hidden)) 2223 m->set_hidden(true); 2224 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2225 m->set_intrinsic_candidate(true); 2226 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2227 m->set_has_reserved_stack_access(true); 2228 } 2229 2230 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2231 assert(ik != NULL, "invariant"); 2232 ik->set_is_contended(is_contended()); 2233 } 2234 2235 #define MAX_ARGS_SIZE 255 2236 #define MAX_CODE_SIZE 65535 2237 #define INITIAL_MAX_LVT_NUMBER 256 2238 2239 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2240 * 2241 * Rules for LVT's and LVTT's are: 2242 * - There can be any number of LVT's and LVTT's. 2243 * - If there are n LVT's, it is the same as if there was just 2244 * one LVT containing all the entries from the n LVT's. 2245 * - There may be no more than one LVT entry per local variable. 2246 * Two LVT entries are 'equal' if these fields are the same: 2247 * start_pc, length, name, slot 2248 * - There may be no more than one LVTT entry per each LVT entry. 2249 * Each LVTT entry has to match some LVT entry. 2250 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2251 */ 2252 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2253 int lvt_cnt, 2254 u2* const localvariable_table_length, 2255 const unsafe_u2** const localvariable_table_start, 2256 int lvtt_cnt, 2257 u2* const localvariable_type_table_length, 2258 const unsafe_u2** const localvariable_type_table_start, 2259 TRAPS) { 2260 2261 ResourceMark rm(THREAD); 2262 2263 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2264 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2265 2266 LVT_HashTable* const table = new LVT_HashTable(); 2267 2268 // To fill LocalVariableTable in 2269 const Classfile_LVT_Element* cf_lvt; 2270 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2271 2272 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2273 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2274 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2275 copy_lvt_element(&cf_lvt[idx], lvt); 2276 // If no duplicates, add LVT elem in hashtable. 2277 if (table->put(*lvt, lvt) == false 2278 && _need_verify 2279 && _major_version >= JAVA_1_5_VERSION) { 2280 classfile_parse_error("Duplicated LocalVariableTable attribute " 2281 "entry for '%s' in class file %s", 2282 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2283 CHECK); 2284 } 2285 } 2286 } 2287 2288 // To merge LocalVariableTable and LocalVariableTypeTable 2289 const Classfile_LVT_Element* cf_lvtt; 2290 LocalVariableTableElement lvtt_elem; 2291 2292 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2293 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2294 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2295 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2296 LocalVariableTableElement** entry = table->get(lvtt_elem); 2297 if (entry == NULL) { 2298 if (_need_verify) { 2299 classfile_parse_error("LVTT entry for '%s' in class file %s " 2300 "does not match any LVT entry", 2301 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2302 CHECK); 2303 } 2304 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2305 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2306 "entry for '%s' in class file %s", 2307 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2308 CHECK); 2309 } else { 2310 // to add generic signatures into LocalVariableTable 2311 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2312 } 2313 } 2314 } 2315 } 2316 2317 2318 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2319 const u1* runtime_visible_annotations, 2320 int runtime_visible_annotations_length, 2321 const u1* runtime_invisible_annotations, 2322 int runtime_invisible_annotations_length, 2323 const u1* runtime_visible_parameter_annotations, 2324 int runtime_visible_parameter_annotations_length, 2325 const u1* runtime_invisible_parameter_annotations, 2326 int runtime_invisible_parameter_annotations_length, 2327 const u1* runtime_visible_type_annotations, 2328 int runtime_visible_type_annotations_length, 2329 const u1* runtime_invisible_type_annotations, 2330 int runtime_invisible_type_annotations_length, 2331 const u1* annotation_default, 2332 int annotation_default_length, 2333 TRAPS) { 2334 2335 AnnotationArray* a; 2336 2337 if (runtime_visible_annotations_length + 2338 runtime_invisible_annotations_length > 0) { 2339 a = assemble_annotations(runtime_visible_annotations, 2340 runtime_visible_annotations_length, 2341 runtime_invisible_annotations, 2342 runtime_invisible_annotations_length, 2343 CHECK); 2344 cm->set_method_annotations(a); 2345 } 2346 2347 if (runtime_visible_parameter_annotations_length + 2348 runtime_invisible_parameter_annotations_length > 0) { 2349 a = assemble_annotations(runtime_visible_parameter_annotations, 2350 runtime_visible_parameter_annotations_length, 2351 runtime_invisible_parameter_annotations, 2352 runtime_invisible_parameter_annotations_length, 2353 CHECK); 2354 cm->set_parameter_annotations(a); 2355 } 2356 2357 if (annotation_default_length > 0) { 2358 a = assemble_annotations(annotation_default, 2359 annotation_default_length, 2360 NULL, 2361 0, 2362 CHECK); 2363 cm->set_default_annotations(a); 2364 } 2365 2366 if (runtime_visible_type_annotations_length + 2367 runtime_invisible_type_annotations_length > 0) { 2368 a = assemble_annotations(runtime_visible_type_annotations, 2369 runtime_visible_type_annotations_length, 2370 runtime_invisible_type_annotations, 2371 runtime_invisible_type_annotations_length, 2372 CHECK); 2373 cm->set_type_annotations(a); 2374 } 2375 } 2376 2377 2378 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2379 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2380 // Method* to save footprint, so we only know the size of the resulting Method* when the 2381 // entire method attribute is parsed. 2382 // 2383 // The promoted_flags parameter is used to pass relevant access_flags 2384 // from the method back up to the containing klass. These flag values 2385 // are added to klass's access_flags. 2386 2387 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2388 bool is_interface, 2389 bool is_value_type, 2390 const ConstantPool* cp, 2391 AccessFlags* const promoted_flags, 2392 TRAPS) { 2393 assert(cfs != NULL, "invariant"); 2394 assert(cp != NULL, "invariant"); 2395 assert(promoted_flags != NULL, "invariant"); 2396 2397 ResourceMark rm(THREAD); 2398 // Parse fixed parts: 2399 // access_flags, name_index, descriptor_index, attributes_count 2400 cfs->guarantee_more(8, CHECK_NULL); 2401 2402 int flags = cfs->get_u2_fast(); 2403 const u2 name_index = cfs->get_u2_fast(); 2404 const int cp_size = cp->length(); 2405 check_property( 2406 valid_symbol_at(name_index), 2407 "Illegal constant pool index %u for method name in class file %s", 2408 name_index, CHECK_NULL); 2409 const Symbol* const name = cp->symbol_at(name_index); 2410 verify_legal_method_name(name, CHECK_NULL); 2411 2412 const u2 signature_index = cfs->get_u2_fast(); 2413 guarantee_property( 2414 valid_symbol_at(signature_index), 2415 "Illegal constant pool index %u for method signature in class file %s", 2416 signature_index, CHECK_NULL); 2417 const Symbol* const signature = cp->symbol_at(signature_index); 2418 2419 if (name == vmSymbols::class_initializer_name()) { 2420 // We ignore the other access flags for a valid class initializer. 2421 // (JVM Spec 2nd ed., chapter 4.6) 2422 if (_major_version < 51) { // backward compatibility 2423 flags = JVM_ACC_STATIC; 2424 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2425 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2426 } else { 2427 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2428 } 2429 } else { 2430 verify_legal_method_modifiers(flags, is_interface, is_value_type, name, CHECK_NULL); 2431 } 2432 2433 if (name == vmSymbols::object_initializer_name()) { 2434 if (is_interface) { 2435 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2436 /* TBD: uncomment when javac stops generating <init>() for value types. 2437 } else if (is_value_type) { 2438 classfile_parse_error("Value Type cannot have a method named <init>, class file %s", CHECK_NULL); 2439 */ 2440 } 2441 } 2442 2443 int args_size = -1; // only used when _need_verify is true 2444 if (_need_verify) { 2445 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2446 verify_legal_method_signature(name, signature, CHECK_NULL); 2447 if (args_size > MAX_ARGS_SIZE) { 2448 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2449 } 2450 } 2451 2452 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2453 2454 // Default values for code and exceptions attribute elements 2455 u2 max_stack = 0; 2456 u2 max_locals = 0; 2457 u4 code_length = 0; 2458 const u1* code_start = 0; 2459 u2 exception_table_length = 0; 2460 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2461 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2462 u2 checked_exceptions_length = 0; 2463 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2464 CompressedLineNumberWriteStream* linenumber_table = NULL; 2465 int linenumber_table_length = 0; 2466 int total_lvt_length = 0; 2467 u2 lvt_cnt = 0; 2468 u2 lvtt_cnt = 0; 2469 bool lvt_allocated = false; 2470 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2471 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2472 u2* localvariable_table_length = NULL; 2473 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2474 u2* localvariable_type_table_length = NULL; 2475 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2476 int method_parameters_length = -1; 2477 const u1* method_parameters_data = NULL; 2478 bool method_parameters_seen = false; 2479 bool parsed_code_attribute = false; 2480 bool parsed_checked_exceptions_attribute = false; 2481 bool parsed_stackmap_attribute = false; 2482 // stackmap attribute - JDK1.5 2483 const u1* stackmap_data = NULL; 2484 int stackmap_data_length = 0; 2485 u2 generic_signature_index = 0; 2486 MethodAnnotationCollector parsed_annotations; 2487 const u1* runtime_visible_annotations = NULL; 2488 int runtime_visible_annotations_length = 0; 2489 const u1* runtime_invisible_annotations = NULL; 2490 int runtime_invisible_annotations_length = 0; 2491 const u1* runtime_visible_parameter_annotations = NULL; 2492 int runtime_visible_parameter_annotations_length = 0; 2493 const u1* runtime_invisible_parameter_annotations = NULL; 2494 int runtime_invisible_parameter_annotations_length = 0; 2495 const u1* runtime_visible_type_annotations = NULL; 2496 int runtime_visible_type_annotations_length = 0; 2497 const u1* runtime_invisible_type_annotations = NULL; 2498 int runtime_invisible_type_annotations_length = 0; 2499 bool runtime_invisible_annotations_exists = false; 2500 bool runtime_invisible_type_annotations_exists = false; 2501 bool runtime_invisible_parameter_annotations_exists = false; 2502 const u1* annotation_default = NULL; 2503 int annotation_default_length = 0; 2504 2505 // Parse code and exceptions attribute 2506 u2 method_attributes_count = cfs->get_u2_fast(); 2507 while (method_attributes_count--) { 2508 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2509 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2510 const u4 method_attribute_length = cfs->get_u4_fast(); 2511 check_property( 2512 valid_symbol_at(method_attribute_name_index), 2513 "Invalid method attribute name index %u in class file %s", 2514 method_attribute_name_index, CHECK_NULL); 2515 2516 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2517 if (method_attribute_name == vmSymbols::tag_code()) { 2518 // Parse Code attribute 2519 if (_need_verify) { 2520 guarantee_property( 2521 !access_flags.is_native() && !access_flags.is_abstract(), 2522 "Code attribute in native or abstract methods in class file %s", 2523 CHECK_NULL); 2524 } 2525 if (parsed_code_attribute) { 2526 classfile_parse_error("Multiple Code attributes in class file %s", 2527 CHECK_NULL); 2528 } 2529 parsed_code_attribute = true; 2530 2531 // Stack size, locals size, and code size 2532 if (_major_version == 45 && _minor_version <= 2) { 2533 cfs->guarantee_more(4, CHECK_NULL); 2534 max_stack = cfs->get_u1_fast(); 2535 max_locals = cfs->get_u1_fast(); 2536 code_length = cfs->get_u2_fast(); 2537 } else { 2538 cfs->guarantee_more(8, CHECK_NULL); 2539 max_stack = cfs->get_u2_fast(); 2540 max_locals = cfs->get_u2_fast(); 2541 code_length = cfs->get_u4_fast(); 2542 } 2543 if (_need_verify) { 2544 guarantee_property(args_size <= max_locals, 2545 "Arguments can't fit into locals in class file %s", 2546 CHECK_NULL); 2547 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2548 "Invalid method Code length %u in class file %s", 2549 code_length, CHECK_NULL); 2550 } 2551 // Code pointer 2552 code_start = cfs->current(); 2553 assert(code_start != NULL, "null code start"); 2554 cfs->guarantee_more(code_length, CHECK_NULL); 2555 cfs->skip_u1_fast(code_length); 2556 2557 // Exception handler table 2558 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2559 exception_table_length = cfs->get_u2_fast(); 2560 if (exception_table_length > 0) { 2561 exception_table_start = parse_exception_table(cfs, 2562 code_length, 2563 exception_table_length, 2564 CHECK_NULL); 2565 } 2566 2567 // Parse additional attributes in code attribute 2568 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2569 u2 code_attributes_count = cfs->get_u2_fast(); 2570 2571 unsigned int calculated_attribute_length = 0; 2572 2573 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2574 calculated_attribute_length = 2575 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2576 } else { 2577 // max_stack, locals and length are smaller in pre-version 45.2 classes 2578 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2579 } 2580 calculated_attribute_length += 2581 code_length + 2582 sizeof(exception_table_length) + 2583 sizeof(code_attributes_count) + 2584 exception_table_length * 2585 ( sizeof(u2) + // start_pc 2586 sizeof(u2) + // end_pc 2587 sizeof(u2) + // handler_pc 2588 sizeof(u2) ); // catch_type_index 2589 2590 while (code_attributes_count--) { 2591 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2592 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2593 const u4 code_attribute_length = cfs->get_u4_fast(); 2594 calculated_attribute_length += code_attribute_length + 2595 sizeof(code_attribute_name_index) + 2596 sizeof(code_attribute_length); 2597 check_property(valid_symbol_at(code_attribute_name_index), 2598 "Invalid code attribute name index %u in class file %s", 2599 code_attribute_name_index, 2600 CHECK_NULL); 2601 if (LoadLineNumberTables && 2602 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2603 // Parse and compress line number table 2604 parse_linenumber_table(code_attribute_length, 2605 code_length, 2606 &linenumber_table, 2607 CHECK_NULL); 2608 2609 } else if (LoadLocalVariableTables && 2610 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2611 // Parse local variable table 2612 if (!lvt_allocated) { 2613 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2614 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2615 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2616 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2617 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2618 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2619 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2620 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2621 lvt_allocated = true; 2622 } 2623 if (lvt_cnt == max_lvt_cnt) { 2624 max_lvt_cnt <<= 1; 2625 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2626 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2627 } 2628 localvariable_table_start[lvt_cnt] = 2629 parse_localvariable_table(cfs, 2630 code_length, 2631 max_locals, 2632 code_attribute_length, 2633 &localvariable_table_length[lvt_cnt], 2634 false, // is not LVTT 2635 CHECK_NULL); 2636 total_lvt_length += localvariable_table_length[lvt_cnt]; 2637 lvt_cnt++; 2638 } else if (LoadLocalVariableTypeTables && 2639 _major_version >= JAVA_1_5_VERSION && 2640 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2641 if (!lvt_allocated) { 2642 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2643 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2644 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2645 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2646 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2647 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2648 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2649 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2650 lvt_allocated = true; 2651 } 2652 // Parse local variable type table 2653 if (lvtt_cnt == max_lvtt_cnt) { 2654 max_lvtt_cnt <<= 1; 2655 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2656 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2657 } 2658 localvariable_type_table_start[lvtt_cnt] = 2659 parse_localvariable_table(cfs, 2660 code_length, 2661 max_locals, 2662 code_attribute_length, 2663 &localvariable_type_table_length[lvtt_cnt], 2664 true, // is LVTT 2665 CHECK_NULL); 2666 lvtt_cnt++; 2667 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2668 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2669 // Stack map is only needed by the new verifier in JDK1.5. 2670 if (parsed_stackmap_attribute) { 2671 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2672 } 2673 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2674 stackmap_data_length = code_attribute_length; 2675 parsed_stackmap_attribute = true; 2676 } else { 2677 // Skip unknown attributes 2678 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2679 } 2680 } 2681 // check method attribute length 2682 if (_need_verify) { 2683 guarantee_property(method_attribute_length == calculated_attribute_length, 2684 "Code segment has wrong length in class file %s", 2685 CHECK_NULL); 2686 } 2687 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2688 // Parse Exceptions attribute 2689 if (parsed_checked_exceptions_attribute) { 2690 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2691 CHECK_NULL); 2692 } 2693 parsed_checked_exceptions_attribute = true; 2694 checked_exceptions_start = 2695 parse_checked_exceptions(cfs, 2696 &checked_exceptions_length, 2697 method_attribute_length, 2698 CHECK_NULL); 2699 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2700 // reject multiple method parameters 2701 if (method_parameters_seen) { 2702 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2703 CHECK_NULL); 2704 } 2705 method_parameters_seen = true; 2706 method_parameters_length = cfs->get_u1_fast(); 2707 const u2 real_length = (method_parameters_length * 4u) + 1u; 2708 if (method_attribute_length != real_length) { 2709 classfile_parse_error( 2710 "Invalid MethodParameters method attribute length %u in class file", 2711 method_attribute_length, CHECK_NULL); 2712 } 2713 method_parameters_data = cfs->current(); 2714 cfs->skip_u2_fast(method_parameters_length); 2715 cfs->skip_u2_fast(method_parameters_length); 2716 // ignore this attribute if it cannot be reflected 2717 if (!SystemDictionary::Parameter_klass_loaded()) 2718 method_parameters_length = -1; 2719 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2720 if (method_attribute_length != 0) { 2721 classfile_parse_error( 2722 "Invalid Synthetic method attribute length %u in class file %s", 2723 method_attribute_length, CHECK_NULL); 2724 } 2725 // Should we check that there hasn't already been a synthetic attribute? 2726 access_flags.set_is_synthetic(); 2727 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2728 if (method_attribute_length != 0) { 2729 classfile_parse_error( 2730 "Invalid Deprecated method attribute length %u in class file %s", 2731 method_attribute_length, CHECK_NULL); 2732 } 2733 } else if (_major_version >= JAVA_1_5_VERSION) { 2734 if (method_attribute_name == vmSymbols::tag_signature()) { 2735 if (generic_signature_index != 0) { 2736 classfile_parse_error( 2737 "Multiple Signature attributes for method in class file %s", 2738 CHECK_NULL); 2739 } 2740 if (method_attribute_length != 2) { 2741 classfile_parse_error( 2742 "Invalid Signature attribute length %u in class file %s", 2743 method_attribute_length, CHECK_NULL); 2744 } 2745 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2746 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2747 if (runtime_visible_annotations != NULL) { 2748 classfile_parse_error( 2749 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2750 CHECK_NULL); 2751 } 2752 runtime_visible_annotations_length = method_attribute_length; 2753 runtime_visible_annotations = cfs->current(); 2754 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2755 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2756 parse_annotations(cp, 2757 runtime_visible_annotations, 2758 runtime_visible_annotations_length, 2759 &parsed_annotations, 2760 _loader_data, 2761 CHECK_NULL); 2762 cfs->skip_u1_fast(runtime_visible_annotations_length); 2763 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2764 if (runtime_invisible_annotations_exists) { 2765 classfile_parse_error( 2766 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2767 CHECK_NULL); 2768 } 2769 runtime_invisible_annotations_exists = true; 2770 if (PreserveAllAnnotations) { 2771 runtime_invisible_annotations_length = method_attribute_length; 2772 runtime_invisible_annotations = cfs->current(); 2773 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2774 } 2775 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2776 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2777 if (runtime_visible_parameter_annotations != NULL) { 2778 classfile_parse_error( 2779 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2780 CHECK_NULL); 2781 } 2782 runtime_visible_parameter_annotations_length = method_attribute_length; 2783 runtime_visible_parameter_annotations = cfs->current(); 2784 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2785 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2786 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2787 if (runtime_invisible_parameter_annotations_exists) { 2788 classfile_parse_error( 2789 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2790 CHECK_NULL); 2791 } 2792 runtime_invisible_parameter_annotations_exists = true; 2793 if (PreserveAllAnnotations) { 2794 runtime_invisible_parameter_annotations_length = method_attribute_length; 2795 runtime_invisible_parameter_annotations = cfs->current(); 2796 assert(runtime_invisible_parameter_annotations != NULL, 2797 "null invisible parameter annotations"); 2798 } 2799 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2800 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2801 if (annotation_default != NULL) { 2802 classfile_parse_error( 2803 "Multiple AnnotationDefault attributes for method in class file %s", 2804 CHECK_NULL); 2805 } 2806 annotation_default_length = method_attribute_length; 2807 annotation_default = cfs->current(); 2808 assert(annotation_default != NULL, "null annotation default"); 2809 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2810 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2811 if (runtime_visible_type_annotations != NULL) { 2812 classfile_parse_error( 2813 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2814 CHECK_NULL); 2815 } 2816 runtime_visible_type_annotations_length = method_attribute_length; 2817 runtime_visible_type_annotations = cfs->current(); 2818 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2819 // No need for the VM to parse Type annotations 2820 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2821 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2822 if (runtime_invisible_type_annotations_exists) { 2823 classfile_parse_error( 2824 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2825 CHECK_NULL); 2826 } else { 2827 runtime_invisible_type_annotations_exists = true; 2828 } 2829 if (PreserveAllAnnotations) { 2830 runtime_invisible_type_annotations_length = method_attribute_length; 2831 runtime_invisible_type_annotations = cfs->current(); 2832 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2833 } 2834 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2835 } else { 2836 // Skip unknown attributes 2837 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2838 } 2839 } else { 2840 // Skip unknown attributes 2841 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2842 } 2843 } 2844 2845 if (linenumber_table != NULL) { 2846 linenumber_table->write_terminator(); 2847 linenumber_table_length = linenumber_table->position(); 2848 } 2849 2850 // Make sure there's at least one Code attribute in non-native/non-abstract method 2851 if (_need_verify) { 2852 guarantee_property(access_flags.is_native() || 2853 access_flags.is_abstract() || 2854 parsed_code_attribute, 2855 "Absent Code attribute in method that is not native or abstract in class file %s", 2856 CHECK_NULL); 2857 } 2858 2859 // All sizing information for a Method* is finally available, now create it 2860 InlineTableSizes sizes( 2861 total_lvt_length, 2862 linenumber_table_length, 2863 exception_table_length, 2864 checked_exceptions_length, 2865 method_parameters_length, 2866 generic_signature_index, 2867 runtime_visible_annotations_length + 2868 runtime_invisible_annotations_length, 2869 runtime_visible_parameter_annotations_length + 2870 runtime_invisible_parameter_annotations_length, 2871 runtime_visible_type_annotations_length + 2872 runtime_invisible_type_annotations_length, 2873 annotation_default_length, 2874 0); 2875 2876 Method* const m = Method::allocate(_loader_data, 2877 code_length, 2878 access_flags, 2879 &sizes, 2880 ConstMethod::NORMAL, 2881 CHECK_NULL); 2882 2883 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2884 2885 // Fill in information from fixed part (access_flags already set) 2886 m->set_constants(_cp); 2887 m->set_name_index(name_index); 2888 m->set_signature_index(signature_index); 2889 2890 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 2891 m->constMethod()->set_result_type(rtf.type()); 2892 2893 if (args_size >= 0) { 2894 m->set_size_of_parameters(args_size); 2895 } else { 2896 m->compute_size_of_parameters(THREAD); 2897 } 2898 #ifdef ASSERT 2899 if (args_size >= 0) { 2900 m->compute_size_of_parameters(THREAD); 2901 assert(args_size == m->size_of_parameters(), ""); 2902 } 2903 #endif 2904 2905 // Fill in code attribute information 2906 m->set_max_stack(max_stack); 2907 m->set_max_locals(max_locals); 2908 if (stackmap_data != NULL) { 2909 m->constMethod()->copy_stackmap_data(_loader_data, 2910 (u1*)stackmap_data, 2911 stackmap_data_length, 2912 CHECK_NULL); 2913 } 2914 2915 // Copy byte codes 2916 m->set_code((u1*)code_start); 2917 2918 // Copy line number table 2919 if (linenumber_table != NULL) { 2920 memcpy(m->compressed_linenumber_table(), 2921 linenumber_table->buffer(), 2922 linenumber_table_length); 2923 } 2924 2925 // Copy exception table 2926 if (exception_table_length > 0) { 2927 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2928 m->exception_table_start(), 2929 exception_table_length * sizeof(ExceptionTableElement), 2930 sizeof(u2)); 2931 } 2932 2933 // Copy method parameters 2934 if (method_parameters_length > 0) { 2935 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2936 for (int i = 0; i < method_parameters_length; i++) { 2937 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2938 method_parameters_data += 2; 2939 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2940 method_parameters_data += 2; 2941 } 2942 } 2943 2944 // Copy checked exceptions 2945 if (checked_exceptions_length > 0) { 2946 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2947 m->checked_exceptions_start(), 2948 checked_exceptions_length * sizeof(CheckedExceptionElement), 2949 sizeof(u2)); 2950 } 2951 2952 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2953 if (total_lvt_length > 0) { 2954 promoted_flags->set_has_localvariable_table(); 2955 copy_localvariable_table(m->constMethod(), 2956 lvt_cnt, 2957 localvariable_table_length, 2958 localvariable_table_start, 2959 lvtt_cnt, 2960 localvariable_type_table_length, 2961 localvariable_type_table_start, 2962 CHECK_NULL); 2963 } 2964 2965 if (parsed_annotations.has_any_annotations()) 2966 parsed_annotations.apply_to(m); 2967 2968 // Copy annotations 2969 copy_method_annotations(m->constMethod(), 2970 runtime_visible_annotations, 2971 runtime_visible_annotations_length, 2972 runtime_invisible_annotations, 2973 runtime_invisible_annotations_length, 2974 runtime_visible_parameter_annotations, 2975 runtime_visible_parameter_annotations_length, 2976 runtime_invisible_parameter_annotations, 2977 runtime_invisible_parameter_annotations_length, 2978 runtime_visible_type_annotations, 2979 runtime_visible_type_annotations_length, 2980 runtime_invisible_type_annotations, 2981 runtime_invisible_type_annotations_length, 2982 annotation_default, 2983 annotation_default_length, 2984 CHECK_NULL); 2985 2986 if (name == vmSymbols::finalize_method_name() && 2987 signature == vmSymbols::void_method_signature()) { 2988 if (m->is_empty_method()) { 2989 _has_empty_finalizer = true; 2990 } else { 2991 _has_finalizer = true; 2992 } 2993 } 2994 if (name == vmSymbols::object_initializer_name() && 2995 signature == vmSymbols::void_method_signature() && 2996 m->is_vanilla_constructor()) { 2997 _has_vanilla_constructor = true; 2998 } 2999 3000 NOT_PRODUCT(m->verify()); 3001 return m; 3002 } 3003 3004 3005 // The promoted_flags parameter is used to pass relevant access_flags 3006 // from the methods back up to the containing klass. These flag values 3007 // are added to klass's access_flags. 3008 // Side-effects: populates the _methods field in the parser 3009 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 3010 bool is_interface, 3011 bool is_value_type, 3012 AccessFlags* promoted_flags, 3013 bool* has_final_method, 3014 bool* declares_nonstatic_concrete_methods, 3015 TRAPS) { 3016 assert(cfs != NULL, "invariant"); 3017 assert(promoted_flags != NULL, "invariant"); 3018 assert(has_final_method != NULL, "invariant"); 3019 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 3020 3021 assert(NULL == _methods, "invariant"); 3022 3023 cfs->guarantee_more(2, CHECK); // length 3024 const u2 length = cfs->get_u2_fast(); 3025 if (length == 0) { 3026 _methods = Universe::the_empty_method_array(); 3027 } else { 3028 _methods = MetadataFactory::new_array<Method*>(_loader_data, 3029 length, 3030 NULL, 3031 CHECK); 3032 3033 for (int index = 0; index < length; index++) { 3034 Method* method = parse_method(cfs, 3035 is_interface, 3036 is_value_type, 3037 _cp, 3038 promoted_flags, 3039 CHECK); 3040 3041 if (method->is_final()) { 3042 *has_final_method = true; 3043 } 3044 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 3045 // used for interface initialization, and default method inheritance analysis 3046 if (is_interface && !(*declares_nonstatic_concrete_methods) 3047 && !method->is_abstract() && !method->is_static()) { 3048 *declares_nonstatic_concrete_methods = true; 3049 } 3050 _methods->at_put(index, method); 3051 } 3052 3053 if (_need_verify && length > 1) { 3054 // Check duplicated methods 3055 ResourceMark rm(THREAD); 3056 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 3057 THREAD, NameSigHash*, HASH_ROW_SIZE); 3058 initialize_hashtable(names_and_sigs); 3059 bool dup = false; 3060 const Symbol* name = NULL; 3061 const Symbol* sig = NULL; 3062 { 3063 debug_only(NoSafepointVerifier nsv;) 3064 for (int i = 0; i < length; i++) { 3065 const Method* const m = _methods->at(i); 3066 name = m->name(); 3067 sig = m->signature(); 3068 // If no duplicates, add name/signature in hashtable names_and_sigs. 3069 if (!put_after_lookup(name, sig, names_and_sigs)) { 3070 dup = true; 3071 break; 3072 } 3073 } 3074 } 3075 if (dup) { 3076 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 3077 name->as_C_string(), sig->as_klass_external_name(), CHECK); 3078 } 3079 } 3080 } 3081 } 3082 3083 static const intArray* sort_methods(Array<Method*>* methods) { 3084 const int length = methods->length(); 3085 // If JVMTI original method ordering or sharing is enabled we have to 3086 // remember the original class file ordering. 3087 // We temporarily use the vtable_index field in the Method* to store the 3088 // class file index, so we can read in after calling qsort. 3089 // Put the method ordering in the shared archive. 3090 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3091 for (int index = 0; index < length; index++) { 3092 Method* const m = methods->at(index); 3093 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3094 m->set_vtable_index(index); 3095 } 3096 } 3097 // Sort method array by ascending method name (for faster lookups & vtable construction) 3098 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3099 Method::sort_methods(methods); 3100 3101 intArray* method_ordering = NULL; 3102 // If JVMTI original method ordering or sharing is enabled construct int 3103 // array remembering the original ordering 3104 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3105 method_ordering = new intArray(length, length, -1); 3106 for (int index = 0; index < length; index++) { 3107 Method* const m = methods->at(index); 3108 const int old_index = m->vtable_index(); 3109 assert(old_index >= 0 && old_index < length, "invalid method index"); 3110 method_ordering->at_put(index, old_index); 3111 m->set_vtable_index(Method::invalid_vtable_index); 3112 } 3113 } 3114 return method_ordering; 3115 } 3116 3117 // Parse generic_signature attribute for methods and fields 3118 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3119 TRAPS) { 3120 assert(cfs != NULL, "invariant"); 3121 3122 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3123 const u2 generic_signature_index = cfs->get_u2_fast(); 3124 check_property( 3125 valid_symbol_at(generic_signature_index), 3126 "Invalid Signature attribute at constant pool index %u in class file %s", 3127 generic_signature_index, CHECK_0); 3128 return generic_signature_index; 3129 } 3130 3131 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3132 TRAPS) { 3133 3134 assert(cfs != NULL, "invariant"); 3135 3136 cfs->guarantee_more(2, CHECK); // sourcefile_index 3137 const u2 sourcefile_index = cfs->get_u2_fast(); 3138 check_property( 3139 valid_symbol_at(sourcefile_index), 3140 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3141 sourcefile_index, CHECK); 3142 set_class_sourcefile_index(sourcefile_index); 3143 } 3144 3145 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3146 int length, 3147 TRAPS) { 3148 assert(cfs != NULL, "invariant"); 3149 3150 const u1* const sde_buffer = cfs->current(); 3151 assert(sde_buffer != NULL, "null sde buffer"); 3152 3153 // Don't bother storing it if there is no way to retrieve it 3154 if (JvmtiExport::can_get_source_debug_extension()) { 3155 assert((length+1) > length, "Overflow checking"); 3156 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3157 for (int i = 0; i < length; i++) { 3158 sde[i] = sde_buffer[i]; 3159 } 3160 sde[length] = '\0'; 3161 set_class_sde_buffer((const char*)sde, length); 3162 } 3163 // Got utf8 string, set stream position forward 3164 cfs->skip_u1(length, CHECK); 3165 } 3166 3167 3168 // Inner classes can be static, private or protected (classic VM does this) 3169 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3170 JVM_ACC_PRIVATE | \ 3171 JVM_ACC_PROTECTED | \ 3172 JVM_ACC_STATIC \ 3173 ) 3174 3175 u2 ClassFileParser::parse_value_types_attribute(const ClassFileStream* const cfs, 3176 const u1* const value_types_attribute_start, 3177 TRAPS) { 3178 const u1* const current_mark = cfs->current(); 3179 u2 length = 0; 3180 if (value_types_attribute_start != NULL) { 3181 cfs->set_current(value_types_attribute_start); 3182 cfs->guarantee_more(2, CHECK_0); // length 3183 length = cfs->get_u2_fast(); 3184 } 3185 Array<ValueTypes>* const value_types = MetadataFactory::new_array<ValueTypes>(_loader_data, length, CHECK_0); 3186 3187 int index = 0; 3188 const int cp_size = _cp->length(); 3189 cfs->guarantee_more(2 *length, CHECK_0); 3190 for (int n = 0; n < length; n++) { 3191 // Value types class index 3192 const u2 value_types_info_index = cfs->get_u2_fast(); 3193 check_property( 3194 valid_klass_reference_at(value_types_info_index), 3195 "value_types_info_index %u has bad constant type in class file %s", 3196 value_types_info_index, CHECK_0); 3197 ValueTypes vt; 3198 vt._class_info_index = value_types_info_index; 3199 vt._class_name = NULL; 3200 value_types->at_put(index++, vt); 3201 } 3202 _value_types = value_types; 3203 // Restore buffer's current position. 3204 cfs->set_current(current_mark); 3205 3206 return length; 3207 } 3208 3209 // Return number of classes in the inner classes attribute table 3210 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3211 const u1* const inner_classes_attribute_start, 3212 bool parsed_enclosingmethod_attribute, 3213 u2 enclosing_method_class_index, 3214 u2 enclosing_method_method_index, 3215 TRAPS) { 3216 const u1* const current_mark = cfs->current(); 3217 u2 length = 0; 3218 if (inner_classes_attribute_start != NULL) { 3219 cfs->set_current(inner_classes_attribute_start); 3220 cfs->guarantee_more(2, CHECK_0); // length 3221 length = cfs->get_u2_fast(); 3222 } 3223 3224 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3225 // method data: 3226 // [inner_class_info_index, 3227 // outer_class_info_index, 3228 // inner_name_index, 3229 // inner_class_access_flags, 3230 // ... 3231 // enclosing_method_class_index, 3232 // enclosing_method_method_index] 3233 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3234 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3235 _inner_classes = inner_classes; 3236 3237 int index = 0; 3238 const int cp_size = _cp->length(); 3239 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3240 for (int n = 0; n < length; n++) { 3241 // Inner class index 3242 const u2 inner_class_info_index = cfs->get_u2_fast(); 3243 check_property( 3244 valid_klass_reference_at(inner_class_info_index), 3245 "inner_class_info_index %u has bad constant type in class file %s", 3246 inner_class_info_index, CHECK_0); 3247 // Outer class index 3248 const u2 outer_class_info_index = cfs->get_u2_fast(); 3249 check_property( 3250 outer_class_info_index == 0 || 3251 valid_klass_reference_at(outer_class_info_index), 3252 "outer_class_info_index %u has bad constant type in class file %s", 3253 outer_class_info_index, CHECK_0); 3254 // Inner class name 3255 const u2 inner_name_index = cfs->get_u2_fast(); 3256 check_property( 3257 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3258 "inner_name_index %u has bad constant type in class file %s", 3259 inner_name_index, CHECK_0); 3260 if (_need_verify) { 3261 guarantee_property(inner_class_info_index != outer_class_info_index, 3262 "Class is both outer and inner class in class file %s", CHECK_0); 3263 } 3264 3265 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS; 3266 // JVM_ACC_MODULE is defined in JDK-9 and later. 3267 if (_major_version >= JAVA_9_VERSION) { 3268 recognized_modifiers |= JVM_ACC_MODULE; 3269 } 3270 // JVM_ACC_VALUE is defined for class file version 55 and later 3271 if (supports_value_types()) { 3272 recognized_modifiers |= JVM_ACC_VALUE; 3273 } 3274 3275 // Access flags 3276 jint flags = cfs->get_u2_fast() & recognized_modifiers; 3277 3278 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3279 // Set abstract bit for old class files for backward compatibility 3280 flags |= JVM_ACC_ABSTRACT; 3281 } 3282 verify_legal_class_modifiers(flags, CHECK_0); 3283 AccessFlags inner_access_flags(flags); 3284 3285 inner_classes->at_put(index++, inner_class_info_index); 3286 inner_classes->at_put(index++, outer_class_info_index); 3287 inner_classes->at_put(index++, inner_name_index); 3288 inner_classes->at_put(index++, inner_access_flags.as_short()); 3289 } 3290 3291 // 4347400: make sure there's no duplicate entry in the classes array 3292 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3293 for(int i = 0; i < length * 4; i += 4) { 3294 for(int j = i + 4; j < length * 4; j += 4) { 3295 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3296 inner_classes->at(i+1) != inner_classes->at(j+1) || 3297 inner_classes->at(i+2) != inner_classes->at(j+2) || 3298 inner_classes->at(i+3) != inner_classes->at(j+3)), 3299 "Duplicate entry in InnerClasses in class file %s", 3300 CHECK_0); 3301 } 3302 } 3303 } 3304 3305 // Set EnclosingMethod class and method indexes. 3306 if (parsed_enclosingmethod_attribute) { 3307 inner_classes->at_put(index++, enclosing_method_class_index); 3308 inner_classes->at_put(index++, enclosing_method_method_index); 3309 } 3310 assert(index == size, "wrong size"); 3311 3312 // Restore buffer's current position. 3313 cfs->set_current(current_mark); 3314 3315 return length; 3316 } 3317 3318 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3319 set_class_synthetic_flag(true); 3320 } 3321 3322 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3323 assert(cfs != NULL, "invariant"); 3324 3325 const u2 signature_index = cfs->get_u2(CHECK); 3326 check_property( 3327 valid_symbol_at(signature_index), 3328 "Invalid constant pool index %u in Signature attribute in class file %s", 3329 signature_index, CHECK); 3330 set_class_generic_signature_index(signature_index); 3331 } 3332 3333 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3334 ConstantPool* cp, 3335 u4 attribute_byte_length, 3336 TRAPS) { 3337 assert(cfs != NULL, "invariant"); 3338 assert(cp != NULL, "invariant"); 3339 3340 const u1* const current_start = cfs->current(); 3341 3342 guarantee_property(attribute_byte_length >= sizeof(u2), 3343 "Invalid BootstrapMethods attribute length %u in class file %s", 3344 attribute_byte_length, 3345 CHECK); 3346 3347 cfs->guarantee_more(attribute_byte_length, CHECK); 3348 3349 const int attribute_array_length = cfs->get_u2_fast(); 3350 3351 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3352 "Short length on BootstrapMethods in class file %s", 3353 CHECK); 3354 3355 3356 // The attribute contains a counted array of counted tuples of shorts, 3357 // represending bootstrap specifiers: 3358 // length*{bootstrap_method_index, argument_count*{argument_index}} 3359 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3360 // operand_count = number of shorts in attr, except for leading length 3361 3362 // The attribute is copied into a short[] array. 3363 // The array begins with a series of short[2] pairs, one for each tuple. 3364 const int index_size = (attribute_array_length * 2); 3365 3366 Array<u2>* const operands = 3367 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3368 3369 // Eagerly assign operands so they will be deallocated with the constant 3370 // pool if there is an error. 3371 cp->set_operands(operands); 3372 3373 int operand_fill_index = index_size; 3374 const int cp_size = cp->length(); 3375 3376 for (int n = 0; n < attribute_array_length; n++) { 3377 // Store a 32-bit offset into the header of the operand array. 3378 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3379 3380 // Read a bootstrap specifier. 3381 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3382 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3383 const u2 argument_count = cfs->get_u2_fast(); 3384 check_property( 3385 valid_cp_range(bootstrap_method_index, cp_size) && 3386 cp->tag_at(bootstrap_method_index).is_method_handle(), 3387 "bootstrap_method_index %u has bad constant type in class file %s", 3388 bootstrap_method_index, 3389 CHECK); 3390 3391 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3392 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3393 CHECK); 3394 3395 operands->at_put(operand_fill_index++, bootstrap_method_index); 3396 operands->at_put(operand_fill_index++, argument_count); 3397 3398 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3399 for (int j = 0; j < argument_count; j++) { 3400 const u2 argument_index = cfs->get_u2_fast(); 3401 check_property( 3402 valid_cp_range(argument_index, cp_size) && 3403 cp->tag_at(argument_index).is_loadable_constant(), 3404 "argument_index %u has bad constant type in class file %s", 3405 argument_index, 3406 CHECK); 3407 operands->at_put(operand_fill_index++, argument_index); 3408 } 3409 } 3410 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3411 "Bad length on BootstrapMethods in class file %s", 3412 CHECK); 3413 } 3414 3415 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3416 ConstantPool* cp, 3417 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3418 TRAPS) { 3419 assert(cfs != NULL, "invariant"); 3420 assert(cp != NULL, "invariant"); 3421 assert(parsed_annotations != NULL, "invariant"); 3422 3423 // Set inner classes attribute to default sentinel 3424 _inner_classes = Universe::the_empty_short_array(); 3425 cfs->guarantee_more(2, CHECK); // attributes_count 3426 u2 attributes_count = cfs->get_u2_fast(); 3427 bool parsed_sourcefile_attribute = false; 3428 bool parsed_innerclasses_attribute = false; 3429 bool parsed_value_types_attribute = false; 3430 bool parsed_enclosingmethod_attribute = false; 3431 bool parsed_bootstrap_methods_attribute = false; 3432 const u1* runtime_visible_annotations = NULL; 3433 int runtime_visible_annotations_length = 0; 3434 const u1* runtime_invisible_annotations = NULL; 3435 int runtime_invisible_annotations_length = 0; 3436 const u1* runtime_visible_type_annotations = NULL; 3437 int runtime_visible_type_annotations_length = 0; 3438 const u1* runtime_invisible_type_annotations = NULL; 3439 int runtime_invisible_type_annotations_length = 0; 3440 bool runtime_invisible_type_annotations_exists = false; 3441 bool runtime_invisible_annotations_exists = false; 3442 bool parsed_source_debug_ext_annotations_exist = false; 3443 const u1* inner_classes_attribute_start = NULL; 3444 u4 inner_classes_attribute_length = 0; 3445 const u1* value_types_attribute_start = NULL; 3446 u4 value_types_attribute_length = 0; 3447 u2 enclosing_method_class_index = 0; 3448 u2 enclosing_method_method_index = 0; 3449 // Iterate over attributes 3450 while (attributes_count--) { 3451 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3452 const u2 attribute_name_index = cfs->get_u2_fast(); 3453 const u4 attribute_length = cfs->get_u4_fast(); 3454 check_property( 3455 valid_symbol_at(attribute_name_index), 3456 "Attribute name has bad constant pool index %u in class file %s", 3457 attribute_name_index, CHECK); 3458 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3459 if (tag == vmSymbols::tag_source_file()) { 3460 // Check for SourceFile tag 3461 if (_need_verify) { 3462 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3463 } 3464 if (parsed_sourcefile_attribute) { 3465 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3466 } else { 3467 parsed_sourcefile_attribute = true; 3468 } 3469 parse_classfile_sourcefile_attribute(cfs, CHECK); 3470 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3471 // Check for SourceDebugExtension tag 3472 if (parsed_source_debug_ext_annotations_exist) { 3473 classfile_parse_error( 3474 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3475 } 3476 parsed_source_debug_ext_annotations_exist = true; 3477 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3478 } else if (tag == vmSymbols::tag_inner_classes()) { 3479 // Check for InnerClasses tag 3480 if (parsed_innerclasses_attribute) { 3481 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3482 } else { 3483 parsed_innerclasses_attribute = true; 3484 } 3485 inner_classes_attribute_start = cfs->current(); 3486 inner_classes_attribute_length = attribute_length; 3487 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3488 } else if (tag == vmSymbols::tag_value_types()) { 3489 // Ignore ValueTypes attribute unless value type support is enabled. 3490 if (supports_value_types()) { 3491 // Check for ValueTypes tag 3492 if (parsed_value_types_attribute) { 3493 classfile_parse_error("Multiple ValueTypes attributes in class file %s", CHECK); 3494 } else { 3495 parsed_value_types_attribute = true; 3496 } 3497 value_types_attribute_start = cfs->current(); 3498 value_types_attribute_length = attribute_length; 3499 } 3500 cfs->skip_u1(attribute_length, CHECK); 3501 } else if (tag == vmSymbols::tag_synthetic()) { 3502 // Check for Synthetic tag 3503 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3504 if (attribute_length != 0) { 3505 classfile_parse_error( 3506 "Invalid Synthetic classfile attribute length %u in class file %s", 3507 attribute_length, CHECK); 3508 } 3509 parse_classfile_synthetic_attribute(CHECK); 3510 } else if (tag == vmSymbols::tag_deprecated()) { 3511 // Check for Deprecatd tag - 4276120 3512 if (attribute_length != 0) { 3513 classfile_parse_error( 3514 "Invalid Deprecated classfile attribute length %u in class file %s", 3515 attribute_length, CHECK); 3516 } 3517 } else if (_major_version >= JAVA_1_5_VERSION) { 3518 if (tag == vmSymbols::tag_signature()) { 3519 if (_generic_signature_index != 0) { 3520 classfile_parse_error( 3521 "Multiple Signature attributes in class file %s", CHECK); 3522 } 3523 if (attribute_length != 2) { 3524 classfile_parse_error( 3525 "Wrong Signature attribute length %u in class file %s", 3526 attribute_length, CHECK); 3527 } 3528 parse_classfile_signature_attribute(cfs, CHECK); 3529 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3530 if (runtime_visible_annotations != NULL) { 3531 classfile_parse_error( 3532 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3533 } 3534 runtime_visible_annotations_length = attribute_length; 3535 runtime_visible_annotations = cfs->current(); 3536 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3537 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3538 parse_annotations(cp, 3539 runtime_visible_annotations, 3540 runtime_visible_annotations_length, 3541 parsed_annotations, 3542 _loader_data, 3543 CHECK); 3544 cfs->skip_u1_fast(runtime_visible_annotations_length); 3545 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3546 if (runtime_invisible_annotations_exists) { 3547 classfile_parse_error( 3548 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3549 } 3550 runtime_invisible_annotations_exists = true; 3551 if (PreserveAllAnnotations) { 3552 runtime_invisible_annotations_length = attribute_length; 3553 runtime_invisible_annotations = cfs->current(); 3554 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3555 } 3556 cfs->skip_u1(attribute_length, CHECK); 3557 } else if (tag == vmSymbols::tag_enclosing_method()) { 3558 if (parsed_enclosingmethod_attribute) { 3559 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3560 } else { 3561 parsed_enclosingmethod_attribute = true; 3562 } 3563 guarantee_property(attribute_length == 4, 3564 "Wrong EnclosingMethod attribute length %u in class file %s", 3565 attribute_length, CHECK); 3566 cfs->guarantee_more(4, CHECK); // class_index, method_index 3567 enclosing_method_class_index = cfs->get_u2_fast(); 3568 enclosing_method_method_index = cfs->get_u2_fast(); 3569 if (enclosing_method_class_index == 0) { 3570 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3571 } 3572 // Validate the constant pool indices and types 3573 check_property(valid_klass_reference_at(enclosing_method_class_index), 3574 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3575 if (enclosing_method_method_index != 0 && 3576 (!cp->is_within_bounds(enclosing_method_method_index) || 3577 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3578 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3579 } 3580 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3581 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3582 if (parsed_bootstrap_methods_attribute) { 3583 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3584 } 3585 parsed_bootstrap_methods_attribute = true; 3586 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3587 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3588 if (runtime_visible_type_annotations != NULL) { 3589 classfile_parse_error( 3590 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3591 } 3592 runtime_visible_type_annotations_length = attribute_length; 3593 runtime_visible_type_annotations = cfs->current(); 3594 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3595 // No need for the VM to parse Type annotations 3596 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3597 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3598 if (runtime_invisible_type_annotations_exists) { 3599 classfile_parse_error( 3600 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3601 } else { 3602 runtime_invisible_type_annotations_exists = true; 3603 } 3604 if (PreserveAllAnnotations) { 3605 runtime_invisible_type_annotations_length = attribute_length; 3606 runtime_invisible_type_annotations = cfs->current(); 3607 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3608 } 3609 cfs->skip_u1(attribute_length, CHECK); 3610 } else { 3611 // Unknown attribute 3612 cfs->skip_u1(attribute_length, CHECK); 3613 } 3614 } else { 3615 // Unknown attribute 3616 cfs->skip_u1(attribute_length, CHECK); 3617 } 3618 } 3619 _annotations = assemble_annotations(runtime_visible_annotations, 3620 runtime_visible_annotations_length, 3621 runtime_invisible_annotations, 3622 runtime_invisible_annotations_length, 3623 CHECK); 3624 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3625 runtime_visible_type_annotations_length, 3626 runtime_invisible_type_annotations, 3627 runtime_invisible_type_annotations_length, 3628 CHECK); 3629 3630 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3631 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3632 cfs, 3633 inner_classes_attribute_start, 3634 parsed_innerclasses_attribute, 3635 enclosing_method_class_index, 3636 enclosing_method_method_index, 3637 CHECK); 3638 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3639 guarantee_property( 3640 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3641 "Wrong InnerClasses attribute length in class file %s", CHECK); 3642 } 3643 } 3644 3645 if (parsed_value_types_attribute) { 3646 parse_value_types_attribute(cfs, value_types_attribute_start, CHECK); 3647 } 3648 3649 if (_max_bootstrap_specifier_index >= 0) { 3650 guarantee_property(parsed_bootstrap_methods_attribute, 3651 "Missing BootstrapMethods attribute in class file %s", CHECK); 3652 } 3653 } 3654 3655 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3656 assert(k != NULL, "invariant"); 3657 3658 if (_synthetic_flag) 3659 k->set_is_synthetic(); 3660 if (_sourcefile_index != 0) { 3661 k->set_source_file_name_index(_sourcefile_index); 3662 } 3663 if (_generic_signature_index != 0) { 3664 k->set_generic_signature_index(_generic_signature_index); 3665 } 3666 if (_sde_buffer != NULL) { 3667 k->set_source_debug_extension(_sde_buffer, _sde_length); 3668 } 3669 } 3670 3671 // Create the Annotations object that will 3672 // hold the annotations array for the Klass. 3673 void ClassFileParser::create_combined_annotations(TRAPS) { 3674 if (_annotations == NULL && 3675 _type_annotations == NULL && 3676 _fields_annotations == NULL && 3677 _fields_type_annotations == NULL) { 3678 // Don't create the Annotations object unnecessarily. 3679 return; 3680 } 3681 3682 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3683 annotations->set_class_annotations(_annotations); 3684 annotations->set_class_type_annotations(_type_annotations); 3685 annotations->set_fields_annotations(_fields_annotations); 3686 annotations->set_fields_type_annotations(_fields_type_annotations); 3687 3688 // This is the Annotations object that will be 3689 // assigned to InstanceKlass being constructed. 3690 _combined_annotations = annotations; 3691 3692 // The annotations arrays below has been transfered the 3693 // _combined_annotations so these fields can now be cleared. 3694 _annotations = NULL; 3695 _type_annotations = NULL; 3696 _fields_annotations = NULL; 3697 _fields_type_annotations = NULL; 3698 } 3699 3700 // Transfer ownership of metadata allocated to the InstanceKlass. 3701 void ClassFileParser::apply_parsed_class_metadata( 3702 InstanceKlass* this_klass, 3703 int java_fields_count, TRAPS) { 3704 assert(this_klass != NULL, "invariant"); 3705 3706 _cp->set_pool_holder(this_klass); 3707 this_klass->set_constants(_cp); 3708 this_klass->set_fields(_fields, java_fields_count); 3709 this_klass->set_methods(_methods); 3710 this_klass->set_inner_classes(_inner_classes); 3711 this_klass->set_value_types(_value_types); 3712 this_klass->set_local_interfaces(_local_interfaces); 3713 this_klass->set_annotations(_combined_annotations); 3714 // Delay the setting of _transitive_interfaces until after initialize_supers() in 3715 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with 3716 // its _super. If an OOM occurs while loading the current klass, its _super field 3717 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3718 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3719 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3720 3721 // Clear out these fields so they don't get deallocated by the destructor 3722 clear_class_metadata(); 3723 } 3724 3725 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3726 int runtime_visible_annotations_length, 3727 const u1* const runtime_invisible_annotations, 3728 int runtime_invisible_annotations_length, 3729 TRAPS) { 3730 AnnotationArray* annotations = NULL; 3731 if (runtime_visible_annotations != NULL || 3732 runtime_invisible_annotations != NULL) { 3733 annotations = MetadataFactory::new_array<u1>(_loader_data, 3734 runtime_visible_annotations_length + 3735 runtime_invisible_annotations_length, 3736 CHECK_(annotations)); 3737 if (runtime_visible_annotations != NULL) { 3738 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3739 annotations->at_put(i, runtime_visible_annotations[i]); 3740 } 3741 } 3742 if (runtime_invisible_annotations != NULL) { 3743 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3744 int append = runtime_visible_annotations_length+i; 3745 annotations->at_put(append, runtime_invisible_annotations[i]); 3746 } 3747 } 3748 } 3749 return annotations; 3750 } 3751 3752 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3753 const int super_class_index, 3754 const bool need_verify, 3755 TRAPS) { 3756 assert(cp != NULL, "invariant"); 3757 const InstanceKlass* super_klass = NULL; 3758 3759 if (super_class_index == 0) { 3760 check_property(_class_name == vmSymbols::java_lang_Object() 3761 || (_access_flags.get_flags() & JVM_ACC_VALUE), 3762 "Invalid superclass index %u in class file %s", 3763 super_class_index, 3764 CHECK_NULL); 3765 } else { 3766 check_property(valid_klass_reference_at(super_class_index), 3767 "Invalid superclass index %u in class file %s", 3768 super_class_index, 3769 CHECK_NULL); 3770 // The class name should be legal because it is checked when parsing constant pool. 3771 // However, make sure it is not an array type. 3772 bool is_array = false; 3773 if (cp->tag_at(super_class_index).is_klass()) { 3774 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3775 if (need_verify) 3776 is_array = super_klass->is_array_klass(); 3777 } else if (need_verify) { 3778 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3779 } 3780 if (need_verify) { 3781 guarantee_property(!is_array, 3782 "Bad superclass name in class file %s", CHECK_NULL); 3783 } 3784 } 3785 return super_klass; 3786 } 3787 3788 #ifndef PRODUCT 3789 static void print_field_layout(const Symbol* name, 3790 Array<u2>* fields, 3791 const constantPoolHandle& cp, 3792 int instance_size, 3793 int instance_fields_start, 3794 int instance_fields_end, 3795 int static_fields_end) { 3796 3797 assert(name != NULL, "invariant"); 3798 3799 tty->print("%s: field layout\n", name->as_klass_external_name()); 3800 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3801 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3802 if (!fs.access_flags().is_static()) { 3803 tty->print(" @%3d \"%s\" %s\n", 3804 fs.offset(), 3805 fs.name()->as_klass_external_name(), 3806 fs.signature()->as_klass_external_name()); 3807 } 3808 } 3809 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3810 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3811 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3812 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3813 if (fs.access_flags().is_static()) { 3814 tty->print(" @%3d \"%s\" %s\n", 3815 fs.offset(), 3816 fs.name()->as_klass_external_name(), 3817 fs.signature()->as_klass_external_name()); 3818 } 3819 } 3820 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 3821 tty->print("\n"); 3822 } 3823 #endif 3824 3825 // Values needed for oopmap and InstanceKlass creation 3826 class ClassFileParser::FieldLayoutInfo : public ResourceObj { 3827 public: 3828 OopMapBlocksBuilder* oop_map_blocks; 3829 int instance_size; 3830 int nonstatic_field_size; 3831 int static_field_size; 3832 bool has_nonstatic_fields; 3833 }; 3834 3835 // Utility to collect and compact oop maps during layout 3836 class ClassFileParser::OopMapBlocksBuilder : public ResourceObj { 3837 public: 3838 OopMapBlock* nonstatic_oop_maps; 3839 unsigned int nonstatic_oop_map_count; 3840 unsigned int max_nonstatic_oop_maps; 3841 3842 public: 3843 OopMapBlocksBuilder(unsigned int max_blocks, TRAPS) { 3844 max_nonstatic_oop_maps = max_blocks; 3845 nonstatic_oop_map_count = 0; 3846 if (max_blocks == 0) { 3847 nonstatic_oop_maps = NULL; 3848 } else { 3849 nonstatic_oop_maps = NEW_RESOURCE_ARRAY_IN_THREAD( 3850 THREAD, OopMapBlock, max_nonstatic_oop_maps); 3851 memset(nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); 3852 } 3853 } 3854 3855 OopMapBlock* last_oop_map() const { 3856 assert(nonstatic_oop_map_count > 0, "Has no oop maps"); 3857 return nonstatic_oop_maps + (nonstatic_oop_map_count - 1); 3858 } 3859 3860 // addition of super oop maps 3861 void initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { 3862 assert(nof_blocks && nonstatic_oop_map_count == 0 && 3863 nof_blocks <= max_nonstatic_oop_maps, "invariant"); 3864 3865 memcpy(nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); 3866 nonstatic_oop_map_count += nof_blocks; 3867 } 3868 3869 // collection of oops 3870 void add(int offset, int count) { 3871 if (nonstatic_oop_map_count == 0) { 3872 nonstatic_oop_map_count++; 3873 } 3874 OopMapBlock* nonstatic_oop_map = last_oop_map(); 3875 if (nonstatic_oop_map->count() == 0) { // Unused map, set it up 3876 nonstatic_oop_map->set_offset(offset); 3877 nonstatic_oop_map->set_count(count); 3878 } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add 3879 nonstatic_oop_map->increment_count(count); 3880 } else { // Need a new one... 3881 nonstatic_oop_map_count++; 3882 assert(nonstatic_oop_map_count <= max_nonstatic_oop_maps, "range check"); 3883 nonstatic_oop_map = last_oop_map(); 3884 nonstatic_oop_map->set_offset(offset); 3885 nonstatic_oop_map->set_count(count); 3886 } 3887 } 3888 3889 // general purpose copy, e.g. into allocated instanceKlass 3890 void copy(OopMapBlock* dst) { 3891 if (nonstatic_oop_map_count != 0) { 3892 memcpy(dst, nonstatic_oop_maps, sizeof(OopMapBlock) * nonstatic_oop_map_count); 3893 } 3894 } 3895 3896 // Sort and compact adjacent blocks 3897 void compact(TRAPS) { 3898 if (nonstatic_oop_map_count <= 1) { 3899 return; 3900 } 3901 /* 3902 * Since field layout sneeks in oops before values, we will be able to condense 3903 * blocks. There is potential to compact between super, own refs and values 3904 * containing refs. 3905 * 3906 * Currently compaction is slightly limited due to values being 8 byte aligned. 3907 * This may well change: FixMe if doesn't, the code below is fairly general purpose 3908 * and maybe it doesn't need to be. 3909 */ 3910 qsort(nonstatic_oop_maps, nonstatic_oop_map_count, sizeof(OopMapBlock), 3911 (_sort_Fn)OopMapBlock::compare_offset); 3912 if (nonstatic_oop_map_count < 2) { 3913 return; 3914 } 3915 3916 //Make a temp copy, and iterate through and copy back into the orig 3917 ResourceMark rm(THREAD); 3918 OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, OopMapBlock, 3919 nonstatic_oop_map_count); 3920 OopMapBlock* oop_maps_copy_end = oop_maps_copy + nonstatic_oop_map_count; 3921 copy(oop_maps_copy); 3922 OopMapBlock* nonstatic_oop_map = nonstatic_oop_maps; 3923 unsigned int new_count = 1; 3924 oop_maps_copy++; 3925 while(oop_maps_copy < oop_maps_copy_end) { 3926 assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); 3927 if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { 3928 nonstatic_oop_map->increment_count(oop_maps_copy->count()); 3929 } else { 3930 nonstatic_oop_map++; 3931 new_count++; 3932 nonstatic_oop_map->set_offset(oop_maps_copy->offset()); 3933 nonstatic_oop_map->set_count(oop_maps_copy->count()); 3934 } 3935 oop_maps_copy++; 3936 } 3937 assert(new_count <= nonstatic_oop_map_count, "end up with more maps after compact() ?"); 3938 nonstatic_oop_map_count = new_count; 3939 } 3940 3941 void print_on(outputStream* st) const { 3942 st->print_cr(" OopMapBlocks: %3d /%3d", nonstatic_oop_map_count, max_nonstatic_oop_maps); 3943 if (nonstatic_oop_map_count > 0) { 3944 OopMapBlock* map = nonstatic_oop_maps; 3945 OopMapBlock* last_map = last_oop_map(); 3946 assert(map <= last_map, "Last less than first"); 3947 while (map <= last_map) { 3948 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), 3949 map->offset() + map->offset_span() - heapOopSize, map->count()); 3950 map++; 3951 } 3952 } 3953 } 3954 3955 void print_value_on(outputStream* st) const { 3956 print_on(st); 3957 } 3958 3959 }; 3960 3961 void ClassFileParser::throwValueTypeLimitation(THREAD_AND_LOCATION_DECL, 3962 const char* msg, 3963 const Symbol* name, 3964 const Symbol* sig) const { 3965 3966 ResourceMark rm(THREAD); 3967 if (name == NULL || sig == NULL) { 3968 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS, 3969 vmSymbols::java_lang_ClassFormatError(), 3970 "class: %s - %s", _class_name->as_C_string(), msg); 3971 } 3972 else { 3973 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS, 3974 vmSymbols::java_lang_ClassFormatError(), 3975 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(), 3976 _class_name->as_C_string(), msg); 3977 } 3978 } 3979 3980 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3981 void ClassFileParser::layout_fields(ConstantPool* cp, 3982 const FieldAllocationCount* fac, 3983 const ClassAnnotationCollector* parsed_annotations, 3984 FieldLayoutInfo* info, 3985 TRAPS) { 3986 3987 assert(cp != NULL, "invariant"); 3988 3989 // Field size and offset computation 3990 int nonstatic_field_size = _super_klass == NULL ? 0 : 3991 _super_klass->nonstatic_field_size(); 3992 int next_nonstatic_valuetype_offset = 0; 3993 int first_nonstatic_valuetype_offset = 0; 3994 3995 // Fields that are value types are handled differently depending if they are static or not: 3996 // - static fields are oops 3997 // - non-static fields are embedded 3998 3999 // Count the contended fields by type. 4000 // 4001 // We ignore static fields, because @Contended is not supported for them. 4002 // The layout code below will also ignore the static fields. 4003 int nonstatic_contended_count = 0; 4004 FieldAllocationCount fac_contended; 4005 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4006 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4007 if (fs.is_contended()) { 4008 fac_contended.count[atype]++; 4009 if (!fs.access_flags().is_static()) { 4010 nonstatic_contended_count++; 4011 } 4012 } 4013 } 4014 4015 4016 // Calculate the starting byte offsets 4017 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 4018 // Value types in static fields are not embedded, they are handled with oops 4019 int next_static_double_offset = next_static_oop_offset + 4020 ((fac->count[STATIC_OOP] + fac->count[STATIC_FLATTENABLE]) * heapOopSize); 4021 if (fac->count[STATIC_DOUBLE]) { 4022 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 4023 } 4024 4025 int next_static_word_offset = next_static_double_offset + 4026 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 4027 int next_static_short_offset = next_static_word_offset + 4028 ((fac->count[STATIC_WORD]) * BytesPerInt); 4029 int next_static_byte_offset = next_static_short_offset + 4030 ((fac->count[STATIC_SHORT]) * BytesPerShort); 4031 4032 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 4033 nonstatic_field_size * heapOopSize; 4034 4035 // First field of value types is aligned on a long boundary in order to ease 4036 // in-lining of value types (with header removal) in packed arrays and 4037 // flatten value types 4038 int initial_value_type_padding = 0; 4039 if (is_value_type()) { 4040 int old = nonstatic_fields_start; 4041 nonstatic_fields_start = align_up(nonstatic_fields_start, BytesPerLong); 4042 initial_value_type_padding = nonstatic_fields_start - old; 4043 } 4044 4045 int next_nonstatic_field_offset = nonstatic_fields_start; 4046 4047 const bool is_contended_class = parsed_annotations->is_contended(); 4048 4049 // Class is contended, pad before all the fields 4050 if (is_contended_class) { 4051 next_nonstatic_field_offset += ContendedPaddingWidth; 4052 } 4053 4054 // Temporary value types restrictions 4055 if (is_value_type()) { 4056 if (is_contended_class) { 4057 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support @Contended annotation yet"); 4058 return; 4059 } 4060 } 4061 4062 // Compute the non-contended fields count. 4063 // The packing code below relies on these counts to determine if some field 4064 // can be squeezed into the alignment gap. Contended fields are obviously 4065 // exempt from that. 4066 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 4067 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 4068 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 4069 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 4070 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 4071 4072 int static_value_type_count = 0; 4073 int nonstatic_value_type_count = 0; 4074 int* nonstatic_value_type_indexes = NULL; 4075 Klass** nonstatic_value_type_klasses = NULL; 4076 unsigned int value_type_oop_map_count = 0; 4077 int not_flattened_value_types = 0; 4078 4079 int max_nonstatic_value_type = fac->count[NONSTATIC_FLATTENABLE] + 1; 4080 4081 nonstatic_value_type_indexes = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, int, 4082 max_nonstatic_value_type); 4083 for (int i = 0; i < max_nonstatic_value_type; i++) { 4084 nonstatic_value_type_indexes[i] = -1; 4085 } 4086 nonstatic_value_type_klasses = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, Klass*, 4087 max_nonstatic_value_type); 4088 4089 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 4090 if (fs.allocation_type() == STATIC_FLATTENABLE) { 4091 // Pre-resolve the flattenable field and check for value type circularity 4092 // issues. Note that super-class circularity checks are not needed here 4093 // because flattenable fields can only be in value types and value types 4094 // only have java.lang.Object as their super class. 4095 // Also, note that super-interface circularity checks are not needed 4096 // because interfaces cannot be value types. 4097 ResourceMark rm; 4098 Symbol* sig = fs.signature(); 4099 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1, 4100 sig->utf8_length() - 2, CHECK); 4101 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) { 4102 name->decrement_refcount(); 4103 THROW(vmSymbols::java_lang_ClassFormatError()); 4104 } 4105 name->decrement_refcount(); 4106 Klass* klass = 4107 SystemDictionary::resolve_flattenable_field_or_fail(&fs, 4108 Handle(THREAD, _loader_data->class_loader()), 4109 _protection_domain, true, CHECK); 4110 assert(klass != NULL, "Sanity check"); 4111 if (!klass->access_flags().is_value_type()) { 4112 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 4113 } 4114 static_value_type_count++; 4115 } else if (fs.allocation_type() == NONSTATIC_FLATTENABLE) { 4116 // Pre-resolve the flattenable field and check for value type circularity issues. 4117 ResourceMark rm; 4118 Symbol* sig = fs.signature(); 4119 Symbol* name = SymbolTable::lookup(sig->as_C_string() + 1, 4120 sig->utf8_length() - 2, CHECK); 4121 if (!InstanceKlass::is_declared_value_type(_cp, _value_types, name)) { 4122 name->decrement_refcount(); 4123 THROW(vmSymbols::java_lang_ClassFormatError()); 4124 } 4125 name->decrement_refcount(); 4126 Klass* klass = 4127 SystemDictionary::resolve_flattenable_field_or_fail(&fs, 4128 Handle(THREAD, _loader_data->class_loader()), 4129 _protection_domain, true, CHECK); 4130 assert(klass != NULL, "Sanity check"); 4131 if (!klass->access_flags().is_value_type()) { 4132 THROW(vmSymbols::java_lang_IncompatibleClassChangeError()); 4133 } 4134 ValueKlass* vk = ValueKlass::cast(klass); 4135 // Conditions to apply flattening or not should be defined in a single place 4136 if ((ValueFieldMaxFlatSize < 0) || (vk->size_helper() * HeapWordSize) <= ValueFieldMaxFlatSize) { 4137 nonstatic_value_type_indexes[nonstatic_value_type_count] = fs.index(); 4138 nonstatic_value_type_klasses[nonstatic_value_type_count] = klass; 4139 nonstatic_value_type_count++; 4140 4141 ValueKlass* vklass = ValueKlass::cast(klass); 4142 if (vklass->contains_oops()) { 4143 value_type_oop_map_count += vklass->nonstatic_oop_map_count(); 4144 } 4145 fs.set_flattened(true); 4146 } else { 4147 not_flattened_value_types++; 4148 fs.set_flattened(false); 4149 } 4150 } 4151 } 4152 4153 // Adjusting non_static_oop_count to take into account not flattened value types; 4154 nonstatic_oop_count += not_flattened_value_types; 4155 4156 // Total non-static fields count, including every contended field 4157 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 4158 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 4159 fac->count[NONSTATIC_OOP] + fac->count[NONSTATIC_FLATTENABLE]; 4160 4161 const bool super_has_nonstatic_fields = 4162 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 4163 const bool has_nonstatic_fields = 4164 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 4165 const bool has_nonstatic_value_fields = nonstatic_value_type_count > 0; 4166 4167 if (is_value_type() && (!has_nonstatic_fields)) { 4168 // There are a number of fixes required throughout the type system and JIT 4169 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support zero instance size yet"); 4170 return; 4171 } 4172 4173 // Prepare list of oops for oop map generation. 4174 // 4175 // "offset" and "count" lists are describing the set of contiguous oop 4176 // regions. offset[i] is the start of the i-th region, which then has 4177 // count[i] oops following. Before we know how many regions are required, 4178 // we pessimistically allocate the maps to fit all the oops into the 4179 // distinct regions. 4180 // 4181 int super_oop_map_count = (_super_klass == NULL) ? 0 :_super_klass->nonstatic_oop_map_count(); 4182 int max_oop_map_count = 4183 super_oop_map_count + 4184 fac->count[NONSTATIC_OOP] + 4185 value_type_oop_map_count + 4186 not_flattened_value_types; 4187 4188 OopMapBlocksBuilder* nonstatic_oop_maps = new OopMapBlocksBuilder(max_oop_map_count, THREAD); 4189 if (super_oop_map_count > 0) { 4190 nonstatic_oop_maps->initialize_inherited_blocks(_super_klass->start_of_nonstatic_oop_maps(), 4191 _super_klass->nonstatic_oop_map_count()); 4192 } 4193 4194 int first_nonstatic_oop_offset = 0; // will be set for first oop field 4195 4196 bool compact_fields = CompactFields; 4197 int allocation_style = FieldsAllocationStyle; 4198 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 4199 assert(false, "0 <= FieldsAllocationStyle <= 2"); 4200 allocation_style = 1; // Optimistic 4201 } 4202 4203 // The next classes have predefined hard-coded fields offsets 4204 // (see in JavaClasses::compute_hard_coded_offsets()). 4205 // Use default fields allocation order for them. 4206 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL && 4207 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 4208 _class_name == vmSymbols::java_lang_Class() || 4209 _class_name == vmSymbols::java_lang_ClassLoader() || 4210 _class_name == vmSymbols::java_lang_ref_Reference() || 4211 _class_name == vmSymbols::java_lang_ref_SoftReference() || 4212 _class_name == vmSymbols::java_lang_StackTraceElement() || 4213 _class_name == vmSymbols::java_lang_String() || 4214 _class_name == vmSymbols::java_lang_Throwable() || 4215 _class_name == vmSymbols::java_lang_Boolean() || 4216 _class_name == vmSymbols::java_lang_Character() || 4217 _class_name == vmSymbols::java_lang_Float() || 4218 _class_name == vmSymbols::java_lang_Double() || 4219 _class_name == vmSymbols::java_lang_Byte() || 4220 _class_name == vmSymbols::java_lang_Short() || 4221 _class_name == vmSymbols::java_lang_Integer() || 4222 _class_name == vmSymbols::java_lang_Long())) { 4223 allocation_style = 0; // Allocate oops first 4224 compact_fields = false; // Don't compact fields 4225 } 4226 4227 int next_nonstatic_oop_offset = 0; 4228 int next_nonstatic_double_offset = 0; 4229 4230 // Rearrange fields for a given allocation style 4231 if( allocation_style == 0 ) { 4232 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 4233 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4234 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4235 (nonstatic_oop_count * heapOopSize); 4236 } else if( allocation_style == 1 ) { 4237 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 4238 next_nonstatic_double_offset = next_nonstatic_field_offset; 4239 } else if( allocation_style == 2 ) { 4240 // Fields allocation: oops fields in super and sub classes are together. 4241 if( nonstatic_field_size > 0 && super_oop_map_count > 0 ) { 4242 if (next_nonstatic_field_offset == nonstatic_oop_maps->last_oop_map()->end_offset()) { 4243 allocation_style = 0; // allocate oops first 4244 next_nonstatic_oop_offset = next_nonstatic_field_offset; 4245 next_nonstatic_double_offset = next_nonstatic_oop_offset + 4246 (nonstatic_oop_count * heapOopSize); 4247 } 4248 } 4249 if( allocation_style == 2 ) { 4250 allocation_style = 1; // allocate oops last 4251 next_nonstatic_double_offset = next_nonstatic_field_offset; 4252 } 4253 } else { 4254 ShouldNotReachHere(); 4255 } 4256 4257 int nonstatic_oop_space_count = 0; 4258 int nonstatic_word_space_count = 0; 4259 int nonstatic_short_space_count = 0; 4260 int nonstatic_byte_space_count = 0; 4261 int nonstatic_oop_space_offset = 0; 4262 int nonstatic_word_space_offset = 0; 4263 int nonstatic_short_space_offset = 0; 4264 int nonstatic_byte_space_offset = 0; 4265 4266 // Try to squeeze some of the fields into the gaps due to 4267 // long/double alignment. 4268 if (nonstatic_double_count > 0) { 4269 int offset = next_nonstatic_double_offset; 4270 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 4271 if (compact_fields && offset != next_nonstatic_double_offset) { 4272 // Allocate available fields into the gap before double field. 4273 int length = next_nonstatic_double_offset - offset; 4274 assert(length == BytesPerInt, ""); 4275 nonstatic_word_space_offset = offset; 4276 if (nonstatic_word_count > 0) { 4277 nonstatic_word_count -= 1; 4278 nonstatic_word_space_count = 1; // Only one will fit 4279 length -= BytesPerInt; 4280 offset += BytesPerInt; 4281 } 4282 nonstatic_short_space_offset = offset; 4283 while (length >= BytesPerShort && nonstatic_short_count > 0) { 4284 nonstatic_short_count -= 1; 4285 nonstatic_short_space_count += 1; 4286 length -= BytesPerShort; 4287 offset += BytesPerShort; 4288 } 4289 nonstatic_byte_space_offset = offset; 4290 while (length > 0 && nonstatic_byte_count > 0) { 4291 nonstatic_byte_count -= 1; 4292 nonstatic_byte_space_count += 1; 4293 length -= 1; 4294 } 4295 // Allocate oop field in the gap if there are no other fields for that. 4296 nonstatic_oop_space_offset = offset; 4297 if (length >= heapOopSize && nonstatic_oop_count > 0 && 4298 allocation_style != 0) { // when oop fields not first 4299 nonstatic_oop_count -= 1; 4300 nonstatic_oop_space_count = 1; // Only one will fit 4301 length -= heapOopSize; 4302 offset += heapOopSize; 4303 } 4304 } 4305 } 4306 4307 int next_nonstatic_word_offset = next_nonstatic_double_offset + 4308 (nonstatic_double_count * BytesPerLong); 4309 int next_nonstatic_short_offset = next_nonstatic_word_offset + 4310 (nonstatic_word_count * BytesPerInt); 4311 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 4312 (nonstatic_short_count * BytesPerShort); 4313 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 4314 nonstatic_byte_count; 4315 4316 // let oops jump before padding with this allocation style 4317 if( allocation_style == 1 ) { 4318 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 4319 if( nonstatic_oop_count > 0 ) { 4320 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 4321 } 4322 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 4323 } 4324 4325 // Aligning embedded value types 4326 // bug below, the current algorithm to layout embedded value types always put them at the 4327 // end of the layout, which doesn't match the different allocation policies the VM is 4328 // supposed to provide => FixMe 4329 // Note also that the current alignment policy is to make each value type starting on a 4330 // 64 bits boundary. This could be optimized later. For instance, it could be nice to 4331 // align value types according to their most constrained internal type. 4332 next_nonstatic_valuetype_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4333 int next_value_type_index = 0; 4334 4335 // Iterate over fields again and compute correct offsets. 4336 // The field allocation type was temporarily stored in the offset slot. 4337 // oop fields are located before non-oop fields (static and non-static). 4338 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4339 4340 // skip already laid out fields 4341 if (fs.is_offset_set()) continue; 4342 4343 // contended instance fields are handled below 4344 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 4345 4346 int real_offset = 0; 4347 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4348 4349 // pack the rest of the fields 4350 switch (atype) { 4351 // Value types in static fields are handled with oops 4352 case STATIC_FLATTENABLE: // Fallthrough 4353 case STATIC_OOP: 4354 real_offset = next_static_oop_offset; 4355 next_static_oop_offset += heapOopSize; 4356 break; 4357 case STATIC_BYTE: 4358 real_offset = next_static_byte_offset; 4359 next_static_byte_offset += 1; 4360 break; 4361 case STATIC_SHORT: 4362 real_offset = next_static_short_offset; 4363 next_static_short_offset += BytesPerShort; 4364 break; 4365 case STATIC_WORD: 4366 real_offset = next_static_word_offset; 4367 next_static_word_offset += BytesPerInt; 4368 break; 4369 case STATIC_DOUBLE: 4370 real_offset = next_static_double_offset; 4371 next_static_double_offset += BytesPerLong; 4372 break; 4373 case NONSTATIC_FLATTENABLE: 4374 if (fs.is_flattened()) { 4375 Klass* klass = nonstatic_value_type_klasses[next_value_type_index]; 4376 assert(klass != NULL, "Klass should have been loaded and resolved earlier"); 4377 assert(klass->access_flags().is_value_type(),"Must be a value type"); 4378 ValueKlass* vklass = ValueKlass::cast(klass); 4379 real_offset = next_nonstatic_valuetype_offset; 4380 next_nonstatic_valuetype_offset += (vklass->size_helper()) * wordSize - vklass->first_field_offset(); 4381 // aligning next value type on a 64 bits boundary 4382 next_nonstatic_valuetype_offset = align_up(next_nonstatic_valuetype_offset, BytesPerLong); 4383 next_value_type_index += 1; 4384 4385 if (vklass->contains_oops()) { // add flatten oop maps 4386 int diff = real_offset - vklass->first_field_offset(); 4387 const OopMapBlock* map = vklass->start_of_nonstatic_oop_maps(); 4388 const OopMapBlock* const last_map = map + vklass->nonstatic_oop_map_count(); 4389 while (map < last_map) { 4390 nonstatic_oop_maps->add(map->offset() + diff, map->count()); 4391 map++; 4392 } 4393 } 4394 break; 4395 } else { 4396 // Fall through 4397 } 4398 case NONSTATIC_OOP: 4399 if( nonstatic_oop_space_count > 0 ) { 4400 real_offset = nonstatic_oop_space_offset; 4401 nonstatic_oop_space_offset += heapOopSize; 4402 nonstatic_oop_space_count -= 1; 4403 } else { 4404 real_offset = next_nonstatic_oop_offset; 4405 next_nonstatic_oop_offset += heapOopSize; 4406 } 4407 nonstatic_oop_maps->add(real_offset, 1); 4408 break; 4409 case NONSTATIC_BYTE: 4410 if( nonstatic_byte_space_count > 0 ) { 4411 real_offset = nonstatic_byte_space_offset; 4412 nonstatic_byte_space_offset += 1; 4413 nonstatic_byte_space_count -= 1; 4414 } else { 4415 real_offset = next_nonstatic_byte_offset; 4416 next_nonstatic_byte_offset += 1; 4417 } 4418 break; 4419 case NONSTATIC_SHORT: 4420 if( nonstatic_short_space_count > 0 ) { 4421 real_offset = nonstatic_short_space_offset; 4422 nonstatic_short_space_offset += BytesPerShort; 4423 nonstatic_short_space_count -= 1; 4424 } else { 4425 real_offset = next_nonstatic_short_offset; 4426 next_nonstatic_short_offset += BytesPerShort; 4427 } 4428 break; 4429 case NONSTATIC_WORD: 4430 if( nonstatic_word_space_count > 0 ) { 4431 real_offset = nonstatic_word_space_offset; 4432 nonstatic_word_space_offset += BytesPerInt; 4433 nonstatic_word_space_count -= 1; 4434 } else { 4435 real_offset = next_nonstatic_word_offset; 4436 next_nonstatic_word_offset += BytesPerInt; 4437 } 4438 break; 4439 case NONSTATIC_DOUBLE: 4440 real_offset = next_nonstatic_double_offset; 4441 next_nonstatic_double_offset += BytesPerLong; 4442 break; 4443 default: 4444 ShouldNotReachHere(); 4445 } 4446 fs.set_offset(real_offset); 4447 } 4448 4449 4450 // Handle the contended cases. 4451 // 4452 // Each contended field should not intersect the cache line with another contended field. 4453 // In the absence of alignment information, we end up with pessimistically separating 4454 // the fields with full-width padding. 4455 // 4456 // Additionally, this should not break alignment for the fields, so we round the alignment up 4457 // for each field. 4458 if (nonstatic_contended_count > 0) { 4459 4460 // if there is at least one contended field, we need to have pre-padding for them 4461 next_nonstatic_padded_offset += ContendedPaddingWidth; 4462 4463 // collect all contended groups 4464 ResourceBitMap bm(cp->size()); 4465 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4466 // skip already laid out fields 4467 if (fs.is_offset_set()) continue; 4468 4469 if (fs.is_contended()) { 4470 bm.set_bit(fs.contended_group()); 4471 } 4472 } 4473 4474 int current_group = -1; 4475 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4476 4477 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4478 4479 // skip already laid out fields 4480 if (fs.is_offset_set()) continue; 4481 4482 // skip non-contended fields and fields from different group 4483 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4484 4485 // handle statics below 4486 if (fs.access_flags().is_static()) continue; 4487 4488 int real_offset = 0; 4489 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4490 4491 switch (atype) { 4492 case NONSTATIC_BYTE: 4493 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4494 real_offset = next_nonstatic_padded_offset; 4495 next_nonstatic_padded_offset += 1; 4496 break; 4497 4498 case NONSTATIC_SHORT: 4499 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4500 real_offset = next_nonstatic_padded_offset; 4501 next_nonstatic_padded_offset += BytesPerShort; 4502 break; 4503 4504 case NONSTATIC_WORD: 4505 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4506 real_offset = next_nonstatic_padded_offset; 4507 next_nonstatic_padded_offset += BytesPerInt; 4508 break; 4509 4510 case NONSTATIC_DOUBLE: 4511 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4512 real_offset = next_nonstatic_padded_offset; 4513 next_nonstatic_padded_offset += BytesPerLong; 4514 break; 4515 4516 // Value types in static fields are handled with oops 4517 case NONSTATIC_FLATTENABLE: 4518 throwValueTypeLimitation(THREAD_AND_LOCATION, 4519 "@Contended annotation not supported for value types yet", fs.name(), fs.signature()); 4520 return; 4521 4522 case NONSTATIC_OOP: 4523 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4524 real_offset = next_nonstatic_padded_offset; 4525 next_nonstatic_padded_offset += heapOopSize; 4526 nonstatic_oop_maps->add(real_offset, 1); 4527 break; 4528 4529 default: 4530 ShouldNotReachHere(); 4531 } 4532 4533 if (fs.contended_group() == 0) { 4534 // Contended group defines the equivalence class over the fields: 4535 // the fields within the same contended group are not inter-padded. 4536 // The only exception is default group, which does not incur the 4537 // equivalence, and so requires intra-padding. 4538 next_nonstatic_padded_offset += ContendedPaddingWidth; 4539 } 4540 4541 fs.set_offset(real_offset); 4542 } // for 4543 4544 // Start laying out the next group. 4545 // Note that this will effectively pad the last group in the back; 4546 // this is expected to alleviate memory contention effects for 4547 // subclass fields and/or adjacent object. 4548 // If this was the default group, the padding is already in place. 4549 if (current_group != 0) { 4550 next_nonstatic_padded_offset += ContendedPaddingWidth; 4551 } 4552 } 4553 4554 // handle static fields 4555 } 4556 4557 // Entire class is contended, pad in the back. 4558 // This helps to alleviate memory contention effects for subclass fields 4559 // and/or adjacent object. 4560 if (is_contended_class) { 4561 assert(!is_value_type(), "@Contended not supported for value types yet"); 4562 next_nonstatic_padded_offset += ContendedPaddingWidth; 4563 } 4564 4565 int notaligned_nonstatic_fields_end; 4566 if (nonstatic_value_type_count != 0) { 4567 notaligned_nonstatic_fields_end = next_nonstatic_valuetype_offset; 4568 } else { 4569 notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4570 } 4571 4572 int nonstatic_field_sz_align = heapOopSize; 4573 if (is_value_type()) { 4574 if ((notaligned_nonstatic_fields_end - nonstatic_fields_start) > heapOopSize) { 4575 nonstatic_field_sz_align = BytesPerLong; // value copy of fields only uses jlong copy 4576 } 4577 } 4578 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, nonstatic_field_sz_align); 4579 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4580 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4581 4582 int static_field_size = (static_fields_end - 4583 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4584 nonstatic_field_size = nonstatic_field_size + 4585 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4586 4587 int instance_size = align_object_size(instance_end / wordSize); 4588 4589 assert(instance_size == align_object_size(align_up( 4590 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize) 4591 + initial_value_type_padding, wordSize) / wordSize), "consistent layout helper value"); 4592 4593 4594 // Invariant: nonstatic_field end/start should only change if there are 4595 // nonstatic fields in the class, or if the class is contended. We compare 4596 // against the non-aligned value, so that end alignment will not fail the 4597 // assert without actually having the fields. 4598 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4599 is_contended_class || 4600 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4601 4602 // Number of non-static oop map blocks allocated at end of klass. 4603 nonstatic_oop_maps->compact(THREAD); 4604 4605 #ifndef PRODUCT 4606 if ((PrintFieldLayout && !is_value_type()) || 4607 (PrintValueLayout && (is_value_type() || has_nonstatic_value_fields))) { 4608 print_field_layout(_class_name, 4609 _fields, 4610 cp, 4611 instance_size, 4612 nonstatic_fields_start, 4613 nonstatic_fields_end, 4614 static_fields_end); 4615 nonstatic_oop_maps->print_on(tty); 4616 tty->print("\n"); 4617 } 4618 4619 #endif 4620 // Pass back information needed for InstanceKlass creation 4621 info->oop_map_blocks = nonstatic_oop_maps; 4622 info->instance_size = instance_size; 4623 info->static_field_size = static_field_size; 4624 info->nonstatic_field_size = nonstatic_field_size; 4625 info->has_nonstatic_fields = has_nonstatic_fields; 4626 } 4627 4628 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik, TRAPS) { 4629 assert(ik != NULL, "invariant"); 4630 4631 const Klass* const super = ik->super(); 4632 4633 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4634 // in which case we don't have to register objects as finalizable 4635 if (!_has_empty_finalizer) { 4636 if (_has_finalizer || 4637 (super != NULL && super->has_finalizer())) { 4638 ik->set_has_finalizer(); 4639 } 4640 } 4641 4642 #ifdef ASSERT 4643 bool f = false; 4644 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4645 vmSymbols::void_method_signature()); 4646 if (m != NULL && !m->is_empty_method()) { 4647 f = true; 4648 } 4649 4650 // Spec doesn't prevent agent from redefinition of empty finalizer. 4651 // Despite the fact that it's generally bad idea and redefined finalizer 4652 // will not work as expected we shouldn't abort vm in this case 4653 if (!ik->has_redefined_this_or_super()) { 4654 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4655 } 4656 #endif 4657 4658 // Check if this klass supports the java.lang.Cloneable interface 4659 if (SystemDictionary::Cloneable_klass_loaded()) { 4660 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4661 if (ik->is_value()) { 4662 throwValueTypeLimitation(THREAD_AND_LOCATION, "Value Types do not support Cloneable"); 4663 return; 4664 } 4665 ik->set_is_cloneable(); 4666 } 4667 } 4668 4669 // Check if this klass has a vanilla default constructor 4670 if (super == NULL) { 4671 // java.lang.Object has empty default constructor 4672 ik->set_has_vanilla_constructor(); 4673 } else { 4674 if (super->has_vanilla_constructor() && 4675 _has_vanilla_constructor) { 4676 ik->set_has_vanilla_constructor(); 4677 } 4678 #ifdef ASSERT 4679 bool v = false; 4680 if (super->has_vanilla_constructor()) { 4681 const Method* const constructor = 4682 ik->find_method(vmSymbols::object_initializer_name(), 4683 vmSymbols::void_method_signature()); 4684 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4685 v = true; 4686 } 4687 } 4688 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4689 #endif 4690 } 4691 4692 // If it cannot be fast-path allocated, set a bit in the layout helper. 4693 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4694 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4695 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4696 || ik->is_abstract() || ik->is_interface() 4697 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4698 || ik->size_helper() >= FastAllocateSizeLimit) { 4699 // Forbid fast-path allocation. 4700 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4701 ik->set_layout_helper(lh); 4702 } 4703 } 4704 4705 bool ClassFileParser::supports_value_types() const { 4706 // Value types are only supported by class file version 55 and later 4707 return EnableValhalla && _major_version >= JAVA_11_VERSION; 4708 } 4709 4710 // Attach super classes and interface classes to class loader data 4711 static void record_defined_class_dependencies(const InstanceKlass* defined_klass, 4712 TRAPS) { 4713 assert(defined_klass != NULL, "invariant"); 4714 4715 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data(); 4716 if (defining_loader_data->is_the_null_class_loader_data()) { 4717 // Dependencies to null class loader data are implicit. 4718 return; 4719 } else { 4720 // add super class dependency 4721 Klass* const super = defined_klass->super(); 4722 if (super != NULL) { 4723 defining_loader_data->record_dependency(super); 4724 } 4725 4726 // add super interface dependencies 4727 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces(); 4728 if (local_interfaces != NULL) { 4729 const int length = local_interfaces->length(); 4730 for (int i = 0; i < length; i++) { 4731 defining_loader_data->record_dependency(local_interfaces->at(i)); 4732 } 4733 } 4734 4735 for(int i = 0; i < defined_klass->java_fields_count(); i++) { 4736 if ((defined_klass->field_access_flags(i) & JVM_ACC_FLATTENABLE) != 0) { 4737 const Klass* klass = defined_klass->get_value_field_klass(i); 4738 defining_loader_data->record_dependency(klass); 4739 } 4740 } 4741 } 4742 } 4743 4744 // utility methods for appending an array with check for duplicates 4745 4746 static void append_interfaces(GrowableArray<Klass*>* result, 4747 const Array<Klass*>* const ifs) { 4748 // iterate over new interfaces 4749 for (int i = 0; i < ifs->length(); i++) { 4750 Klass* const e = ifs->at(i); 4751 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4752 // add new interface 4753 result->append_if_missing(e); 4754 } 4755 } 4756 4757 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super, 4758 Array<Klass*>* local_ifs, 4759 ClassLoaderData* loader_data, 4760 TRAPS) { 4761 assert(local_ifs != NULL, "invariant"); 4762 assert(loader_data != NULL, "invariant"); 4763 4764 // Compute maximum size for transitive interfaces 4765 int max_transitive_size = 0; 4766 int super_size = 0; 4767 // Add superclass transitive interfaces size 4768 if (super != NULL) { 4769 super_size = super->transitive_interfaces()->length(); 4770 max_transitive_size += super_size; 4771 } 4772 // Add local interfaces' super interfaces 4773 const int local_size = local_ifs->length(); 4774 for (int i = 0; i < local_size; i++) { 4775 Klass* const l = local_ifs->at(i); 4776 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4777 } 4778 // Finally add local interfaces 4779 max_transitive_size += local_size; 4780 // Construct array 4781 if (max_transitive_size == 0) { 4782 // no interfaces, use canonicalized array 4783 return Universe::the_empty_klass_array(); 4784 } else if (max_transitive_size == super_size) { 4785 // no new local interfaces added, share superklass' transitive interface array 4786 return super->transitive_interfaces(); 4787 } else if (max_transitive_size == local_size) { 4788 // only local interfaces added, share local interface array 4789 return local_ifs; 4790 } else { 4791 ResourceMark rm; 4792 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size); 4793 4794 // Copy down from superclass 4795 if (super != NULL) { 4796 append_interfaces(result, super->transitive_interfaces()); 4797 } 4798 4799 // Copy down from local interfaces' superinterfaces 4800 for (int i = 0; i < local_size; i++) { 4801 Klass* const l = local_ifs->at(i); 4802 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4803 } 4804 // Finally add local interfaces 4805 append_interfaces(result, local_ifs); 4806 4807 // length will be less than the max_transitive_size if duplicates were removed 4808 const int length = result->length(); 4809 assert(length <= max_transitive_size, "just checking"); 4810 Array<Klass*>* const new_result = 4811 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL); 4812 for (int i = 0; i < length; i++) { 4813 Klass* const e = result->at(i); 4814 assert(e != NULL, "just checking"); 4815 new_result->at_put(i, e); 4816 } 4817 return new_result; 4818 } 4819 } 4820 4821 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4822 assert(this_klass != NULL, "invariant"); 4823 const Klass* const super = this_klass->super(); 4824 if (super != NULL) { 4825 4826 // If the loader is not the boot loader then throw an exception if its 4827 // superclass is in package jdk.internal.reflect and its loader is not a 4828 // special reflection class loader 4829 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4830 assert(super->is_instance_klass(), "super is not instance klass"); 4831 PackageEntry* super_package = super->package(); 4832 if (super_package != NULL && 4833 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4834 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4835 ResourceMark rm(THREAD); 4836 Exceptions::fthrow( 4837 THREAD_AND_LOCATION, 4838 vmSymbols::java_lang_IllegalAccessError(), 4839 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4840 this_klass->external_name(), 4841 this_klass->class_loader_data()->loader_name(), 4842 super->external_name()); 4843 return; 4844 } 4845 } 4846 4847 Reflection::VerifyClassAccessResults vca_result = 4848 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4849 if (vca_result != Reflection::ACCESS_OK) { 4850 ResourceMark rm(THREAD); 4851 char* msg = Reflection::verify_class_access_msg(this_klass, 4852 InstanceKlass::cast(super), 4853 vca_result); 4854 if (msg == NULL) { 4855 Exceptions::fthrow( 4856 THREAD_AND_LOCATION, 4857 vmSymbols::java_lang_IllegalAccessError(), 4858 "class %s cannot access its superclass %s", 4859 this_klass->external_name(), 4860 super->external_name()); 4861 } else { 4862 // Add additional message content. 4863 Exceptions::fthrow( 4864 THREAD_AND_LOCATION, 4865 vmSymbols::java_lang_IllegalAccessError(), 4866 "superclass access check failed: %s", 4867 msg); 4868 } 4869 } 4870 } 4871 } 4872 4873 4874 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4875 assert(this_klass != NULL, "invariant"); 4876 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces(); 4877 const int lng = local_interfaces->length(); 4878 for (int i = lng - 1; i >= 0; i--) { 4879 Klass* const k = local_interfaces->at(i); 4880 assert (k != NULL && k->is_interface(), "invalid interface"); 4881 Reflection::VerifyClassAccessResults vca_result = 4882 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false); 4883 if (vca_result != Reflection::ACCESS_OK) { 4884 ResourceMark rm(THREAD); 4885 char* msg = Reflection::verify_class_access_msg(this_klass, 4886 InstanceKlass::cast(k), 4887 vca_result); 4888 if (msg == NULL) { 4889 Exceptions::fthrow( 4890 THREAD_AND_LOCATION, 4891 vmSymbols::java_lang_IllegalAccessError(), 4892 "class %s cannot access its superinterface %s", 4893 this_klass->external_name(), 4894 k->external_name()); 4895 } else { 4896 // Add additional message content. 4897 Exceptions::fthrow( 4898 THREAD_AND_LOCATION, 4899 vmSymbols::java_lang_IllegalAccessError(), 4900 "superinterface check failed: %s", 4901 msg); 4902 } 4903 } 4904 } 4905 } 4906 4907 4908 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4909 assert(this_klass != NULL, "invariant"); 4910 const Array<Method*>* const methods = this_klass->methods(); 4911 const int num_methods = methods->length(); 4912 4913 // go thru each method and check if it overrides a final method 4914 for (int index = 0; index < num_methods; index++) { 4915 const Method* const m = methods->at(index); 4916 4917 // skip private, static, and <init> methods 4918 if ((!m->is_private() && !m->is_static()) && 4919 (m->name() != vmSymbols::object_initializer_name())) { 4920 4921 const Symbol* const name = m->name(); 4922 const Symbol* const signature = m->signature(); 4923 const Klass* k = this_klass->super(); 4924 const Method* super_m = NULL; 4925 while (k != NULL) { 4926 // skip supers that don't have final methods. 4927 if (k->has_final_method()) { 4928 // lookup a matching method in the super class hierarchy 4929 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4930 if (super_m == NULL) { 4931 break; // didn't find any match; get out 4932 } 4933 4934 if (super_m->is_final() && !super_m->is_static() && 4935 // matching method in super is final, and not static 4936 (Reflection::verify_field_access(this_klass, 4937 super_m->method_holder(), 4938 super_m->method_holder(), 4939 super_m->access_flags(), false)) 4940 // this class can access super final method and therefore override 4941 ) { 4942 ResourceMark rm(THREAD); 4943 Exceptions::fthrow( 4944 THREAD_AND_LOCATION, 4945 vmSymbols::java_lang_VerifyError(), 4946 "class %s overrides final method %s.%s%s", 4947 this_klass->external_name(), 4948 super_m->method_holder()->external_name(), 4949 name->as_C_string(), 4950 signature->as_C_string() 4951 ); 4952 return; 4953 } 4954 4955 // continue to look from super_m's holder's super. 4956 k = super_m->method_holder()->super(); 4957 continue; 4958 } 4959 4960 k = k->super(); 4961 } 4962 } 4963 } 4964 } 4965 4966 4967 // assumes that this_klass is an interface 4968 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4969 assert(this_klass != NULL, "invariant"); 4970 assert(this_klass->is_interface(), "not an interface"); 4971 const Array<Method*>* methods = this_klass->methods(); 4972 const int num_methods = methods->length(); 4973 4974 for (int index = 0; index < num_methods; index++) { 4975 const Method* const m = methods->at(index); 4976 // if m is static and not the init method, throw a verify error 4977 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4978 ResourceMark rm(THREAD); 4979 Exceptions::fthrow( 4980 THREAD_AND_LOCATION, 4981 vmSymbols::java_lang_VerifyError(), 4982 "Illegal static method %s in interface %s", 4983 m->name()->as_C_string(), 4984 this_klass->external_name() 4985 ); 4986 return; 4987 } 4988 } 4989 } 4990 4991 // utility methods for format checking 4992 4993 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4994 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4995 const bool is_value_type = (flags & JVM_ACC_VALUE) != 0; 4996 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4997 assert(supports_value_types() || !is_value_type, "JVM_ACC_VALUE should not be set"); 4998 if (is_module) { 4999 ResourceMark rm(THREAD); 5000 Exceptions::fthrow( 5001 THREAD_AND_LOCATION, 5002 vmSymbols::java_lang_NoClassDefFoundError(), 5003 "%s is not a class because access_flag ACC_MODULE is set", 5004 _class_name->as_C_string()); 5005 return; 5006 } 5007 5008 if (is_value_type && !EnableValhalla) { 5009 ResourceMark rm(THREAD); 5010 Exceptions::fthrow( 5011 THREAD_AND_LOCATION, 5012 vmSymbols::java_lang_ClassFormatError(), 5013 "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla", 5014 _class_name->as_C_string() 5015 ); 5016 } 5017 5018 if (!_need_verify) { return; } 5019 5020 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 5021 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 5022 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5023 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 5024 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 5025 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 5026 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 5027 5028 if ((is_abstract && is_final) || 5029 (is_interface && !is_abstract) || 5030 (is_interface && major_gte_15 && (is_super || is_enum)) || 5031 (!is_interface && major_gte_15 && is_annotation) || 5032 (is_value_type && (is_interface || is_abstract || is_enum || !is_final))) { 5033 ResourceMark rm(THREAD); 5034 Exceptions::fthrow( 5035 THREAD_AND_LOCATION, 5036 vmSymbols::java_lang_ClassFormatError(), 5037 "Illegal class modifiers in class %s: 0x%X", 5038 _class_name->as_C_string(), flags 5039 ); 5040 return; 5041 } 5042 } 5043 5044 static bool has_illegal_visibility(jint flags) { 5045 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 5046 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 5047 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 5048 5049 return ((is_public && is_protected) || 5050 (is_public && is_private) || 5051 (is_protected && is_private)); 5052 } 5053 5054 // A legal major_version.minor_version must be one of the following: 5055 // 5056 // Major_version = 45, any minor_version. 5057 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0. 5058 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present. 5059 // 5060 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 5061 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 5062 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535 5063 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 5064 if (major != max_version) { 5065 ResourceMark rm(THREAD); 5066 Exceptions::fthrow( 5067 THREAD_AND_LOCATION, 5068 vmSymbols::java_lang_UnsupportedClassVersionError(), 5069 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 5070 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 5071 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 5072 return; 5073 } 5074 5075 if (!Arguments::enable_preview()) { 5076 ResourceMark rm(THREAD); 5077 Exceptions::fthrow( 5078 THREAD_AND_LOCATION, 5079 vmSymbols::java_lang_UnsupportedClassVersionError(), 5080 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 5081 class_name->as_C_string(), major, minor); 5082 return; 5083 } 5084 5085 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 5086 if (major > max_version) { 5087 ResourceMark rm(THREAD); 5088 Exceptions::fthrow( 5089 THREAD_AND_LOCATION, 5090 vmSymbols::java_lang_UnsupportedClassVersionError(), 5091 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 5092 "this version of the Java Runtime only recognizes class file versions up to %u.0", 5093 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 5094 } else if (major < JAVA_MIN_SUPPORTED_VERSION) { 5095 ResourceMark rm(THREAD); 5096 Exceptions::fthrow( 5097 THREAD_AND_LOCATION, 5098 vmSymbols::java_lang_UnsupportedClassVersionError(), 5099 "%s (class file version %u.%u) was compiled with an invalid major version", 5100 class_name->as_C_string(), major, minor); 5101 } else if (minor != 0) { 5102 ResourceMark rm(THREAD); 5103 Exceptions::fthrow( 5104 THREAD_AND_LOCATION, 5105 vmSymbols::java_lang_UnsupportedClassVersionError(), 5106 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 5107 class_name->as_C_string(), major, minor); 5108 } 5109 } 5110 } 5111 } 5112 5113 void ClassFileParser::verify_legal_field_modifiers(jint flags, 5114 bool is_interface, 5115 bool is_value_type, 5116 TRAPS) const { 5117 if (!_need_verify) { return; } 5118 5119 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 5120 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 5121 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 5122 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 5123 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5124 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 5125 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 5126 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 5127 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 5128 5129 bool is_illegal = false; 5130 5131 if (is_interface) { 5132 if (!is_public || !is_static || !is_final || is_private || 5133 is_protected || is_volatile || is_transient || 5134 (major_gte_15 && is_enum)) { 5135 is_illegal = true; 5136 } 5137 } else { // not interface 5138 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 5139 is_illegal = true; 5140 } else { 5141 if (is_value_type && !is_static && !is_final) { 5142 is_illegal = true; 5143 } 5144 } 5145 } 5146 5147 if (is_illegal) { 5148 ResourceMark rm(THREAD); 5149 Exceptions::fthrow( 5150 THREAD_AND_LOCATION, 5151 vmSymbols::java_lang_ClassFormatError(), 5152 "Illegal field modifiers in class %s: 0x%X", 5153 _class_name->as_C_string(), flags); 5154 return; 5155 } 5156 } 5157 5158 void ClassFileParser::verify_legal_method_modifiers(jint flags, 5159 bool is_interface, 5160 bool is_value_type, 5161 const Symbol* name, 5162 TRAPS) const { 5163 if (!_need_verify) { return; } 5164 5165 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 5166 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 5167 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 5168 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 5169 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 5170 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 5171 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 5172 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 5173 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 5174 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 5175 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 5176 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 5177 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 5178 5179 bool is_illegal = false; 5180 5181 if (is_interface) { 5182 if (major_gte_8) { 5183 // Class file version is JAVA_8_VERSION or later Methods of 5184 // interfaces may set any of the flags except ACC_PROTECTED, 5185 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 5186 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 5187 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 5188 (is_native || is_protected || is_final || is_synchronized) || 5189 // If a specific method of a class or interface has its 5190 // ACC_ABSTRACT flag set, it must not have any of its 5191 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 5192 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 5193 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 5194 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 5195 (is_abstract && (is_private || is_static || is_strict))) { 5196 is_illegal = true; 5197 } 5198 } else if (major_gte_15) { 5199 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 5200 if (!is_public || is_private || is_protected || is_static || is_final || 5201 is_synchronized || is_native || !is_abstract || is_strict) { 5202 is_illegal = true; 5203 } 5204 } else { 5205 // Class file version is pre-JAVA_1_5_VERSION 5206 if (!is_public || is_static || is_final || is_native || !is_abstract) { 5207 is_illegal = true; 5208 } 5209 } 5210 } else { // not interface 5211 if (has_illegal_visibility(flags)) { 5212 is_illegal = true; 5213 } else { 5214 if (is_initializer) { 5215 if (is_static || is_final || is_synchronized || is_native || 5216 is_abstract || (major_gte_15 && is_bridge)) { 5217 is_illegal = true; 5218 } 5219 } else { // not initializer 5220 if (is_value_type && is_synchronized && !is_static) { 5221 is_illegal = true; 5222 } else { 5223 if (is_abstract) { 5224 if ((is_final || is_native || is_private || is_static || 5225 (major_gte_15 && (is_synchronized || is_strict)))) { 5226 is_illegal = true; 5227 } 5228 } 5229 } 5230 } 5231 } 5232 } 5233 5234 if (is_illegal) { 5235 ResourceMark rm(THREAD); 5236 Exceptions::fthrow( 5237 THREAD_AND_LOCATION, 5238 vmSymbols::java_lang_ClassFormatError(), 5239 "Method %s in class %s has illegal modifiers: 0x%X", 5240 name->as_C_string(), _class_name->as_C_string(), flags); 5241 return; 5242 } 5243 } 5244 5245 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 5246 int length, 5247 TRAPS) const { 5248 assert(_need_verify, "only called when _need_verify is true"); 5249 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 5250 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5251 } 5252 } 5253 5254 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5255 // In class names, '/' separates unqualified names. This is verified in this function also. 5256 // Method names also may not contain the characters '<' or '>', unless <init> 5257 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5258 // method. Because these names have been checked as special cases before 5259 // calling this method in verify_legal_method_name. 5260 // 5261 // This method is also called from the modular system APIs in modules.cpp 5262 // to verify the validity of module and package names. 5263 bool ClassFileParser::verify_unqualified_name(const char* name, 5264 unsigned int length, 5265 int type) { 5266 for (const char* p = name; p != name + length;) { 5267 jchar ch = *p; 5268 if (ch < 128) { 5269 if (ch == '.' || ch == ';' || ch == '[' ) { 5270 return false; // do not permit '.', ';', or '[' 5271 } 5272 if (ch == '/') { 5273 // check for '//' or leading or trailing '/' which are not legal 5274 // unqualified name must not be empty 5275 if (type == ClassFileParser::LegalClass) { 5276 if (p == name || p+1 >= name+length || *(p+1) == '/') { 5277 return false; 5278 } 5279 } else { 5280 return false; // do not permit '/' unless it's class name 5281 } 5282 } 5283 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) { 5284 return false; // do not permit '<' or '>' in method names 5285 } 5286 p++; 5287 } else { 5288 char* tmp_p = UTF8::next(p, &ch); 5289 p = tmp_p; 5290 } 5291 } 5292 return true; 5293 } 5294 5295 // Take pointer to a string. Skip over the longest part of the string that could 5296 // be taken as a fieldname. Allow '/' if slash_ok is true. 5297 // Return a pointer to just past the fieldname. 5298 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5299 // being true, we saw consecutive slashes (meaning we were looking for a 5300 // qualified path but found something that was badly-formed). 5301 static const char* skip_over_field_name(const char* name, 5302 bool slash_ok, 5303 unsigned int length) { 5304 const char* p; 5305 jboolean last_is_slash = false; 5306 jboolean not_first_ch = false; 5307 5308 for (p = name; p != name + length; not_first_ch = true) { 5309 const char* old_p = p; 5310 jchar ch = *p; 5311 if (ch < 128) { 5312 p++; 5313 // quick check for ascii 5314 if ((ch >= 'a' && ch <= 'z') || 5315 (ch >= 'A' && ch <= 'Z') || 5316 (ch == '_' || ch == '$') || 5317 (not_first_ch && ch >= '0' && ch <= '9')) { 5318 last_is_slash = false; 5319 continue; 5320 } 5321 if (slash_ok && ch == '/') { 5322 if (last_is_slash) { 5323 return NULL; // Don't permit consecutive slashes 5324 } 5325 last_is_slash = true; 5326 continue; 5327 } 5328 } 5329 else { 5330 jint unicode_ch; 5331 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5332 p = tmp_p; 5333 last_is_slash = false; 5334 // Check if ch is Java identifier start or is Java identifier part 5335 // 4672820: call java.lang.Character methods directly without generating separate tables. 5336 EXCEPTION_MARK; 5337 5338 // return value 5339 JavaValue result(T_BOOLEAN); 5340 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5341 JavaCallArguments args; 5342 args.push_int(unicode_ch); 5343 5344 // public static boolean isJavaIdentifierStart(char ch); 5345 JavaCalls::call_static(&result, 5346 SystemDictionary::Character_klass(), 5347 vmSymbols::isJavaIdentifierStart_name(), 5348 vmSymbols::int_bool_signature(), 5349 &args, 5350 THREAD); 5351 5352 if (HAS_PENDING_EXCEPTION) { 5353 CLEAR_PENDING_EXCEPTION; 5354 return 0; 5355 } 5356 if (result.get_jboolean()) { 5357 continue; 5358 } 5359 5360 if (not_first_ch) { 5361 // public static boolean isJavaIdentifierPart(char ch); 5362 JavaCalls::call_static(&result, 5363 SystemDictionary::Character_klass(), 5364 vmSymbols::isJavaIdentifierPart_name(), 5365 vmSymbols::int_bool_signature(), 5366 &args, 5367 THREAD); 5368 5369 if (HAS_PENDING_EXCEPTION) { 5370 CLEAR_PENDING_EXCEPTION; 5371 return 0; 5372 } 5373 5374 if (result.get_jboolean()) { 5375 continue; 5376 } 5377 } 5378 } 5379 return (not_first_ch) ? old_p : NULL; 5380 } 5381 return (not_first_ch) ? p : NULL; 5382 } 5383 5384 // Take pointer to a string. Skip over the longest part of the string that could 5385 // be taken as a field signature. Allow "void" if void_ok. 5386 // Return a pointer to just past the signature. 5387 // Return NULL if no legal signature is found. 5388 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5389 bool void_ok, 5390 unsigned int length, 5391 TRAPS) const { 5392 unsigned int array_dim = 0; 5393 while (length > 0) { 5394 switch (signature[0]) { 5395 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5396 case JVM_SIGNATURE_BOOLEAN: 5397 case JVM_SIGNATURE_BYTE: 5398 case JVM_SIGNATURE_CHAR: 5399 case JVM_SIGNATURE_SHORT: 5400 case JVM_SIGNATURE_INT: 5401 case JVM_SIGNATURE_FLOAT: 5402 case JVM_SIGNATURE_LONG: 5403 case JVM_SIGNATURE_DOUBLE: 5404 return signature + 1; 5405 case JVM_SIGNATURE_CLASS: 5406 { 5407 if (_major_version < JAVA_1_5_VERSION) { 5408 // Skip over the class name if one is there 5409 const char* const p = skip_over_field_name(signature + 1, true, --length); 5410 5411 // The next character better be a semicolon 5412 if (p && (p - signature) > 1 && p[0] == ';') { 5413 return p + 1; 5414 } 5415 } 5416 else { 5417 // Skip leading 'L' and ignore first appearance of ';' 5418 length--; 5419 signature++; 5420 char* c = strchr((char*) signature, ';'); 5421 // Format check signature 5422 if (c != NULL) { 5423 ResourceMark rm(THREAD); 5424 int newlen = c - (char*) signature; 5425 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1); 5426 strncpy(sig, signature, newlen); 5427 sig[newlen] = '\0'; 5428 5429 bool legal = verify_unqualified_name(sig, newlen, LegalClass); 5430 if (!legal) { 5431 classfile_parse_error("Class name contains illegal character " 5432 "in descriptor in class file %s", 5433 CHECK_0); 5434 return NULL; 5435 } 5436 return signature + newlen + 1; 5437 } 5438 } 5439 return NULL; 5440 } 5441 case JVM_SIGNATURE_ARRAY: 5442 array_dim++; 5443 if (array_dim > 255) { 5444 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5445 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5446 } 5447 // The rest of what's there better be a legal signature 5448 signature++; 5449 length--; 5450 void_ok = false; 5451 break; 5452 default: 5453 return NULL; 5454 } 5455 } 5456 return NULL; 5457 } 5458 5459 // Checks if name is a legal class name. 5460 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5461 if (!_need_verify || _relax_verify) { return; } 5462 5463 char buf[fixed_buffer_size]; 5464 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5465 unsigned int length = name->utf8_length(); 5466 bool legal = false; 5467 5468 if (length > 0) { 5469 const char* p; 5470 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5471 p = skip_over_field_signature(bytes, false, length, CHECK); 5472 legal = (p != NULL) && ((p - bytes) == (int)length); 5473 } else if (_major_version < JAVA_1_5_VERSION) { 5474 if (bytes[0] != '<') { 5475 p = skip_over_field_name(bytes, true, length); 5476 legal = (p != NULL) && ((p - bytes) == (int)length); 5477 } 5478 } else { 5479 // 4900761: relax the constraints based on JSR202 spec 5480 // Class names may be drawn from the entire Unicode character set. 5481 // Identifiers between '/' must be unqualified names. 5482 // The utf8 string has been verified when parsing cpool entries. 5483 legal = verify_unqualified_name(bytes, length, LegalClass); 5484 } 5485 } 5486 if (!legal) { 5487 ResourceMark rm(THREAD); 5488 assert(_class_name != NULL, "invariant"); 5489 Exceptions::fthrow( 5490 THREAD_AND_LOCATION, 5491 vmSymbols::java_lang_ClassFormatError(), 5492 "Illegal class name \"%s\" in class file %s", bytes, 5493 _class_name->as_C_string() 5494 ); 5495 return; 5496 } 5497 } 5498 5499 // Checks if name is a legal field name. 5500 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5501 if (!_need_verify || _relax_verify) { return; } 5502 5503 char buf[fixed_buffer_size]; 5504 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5505 unsigned int length = name->utf8_length(); 5506 bool legal = false; 5507 5508 if (length > 0) { 5509 if (_major_version < JAVA_1_5_VERSION) { 5510 if (bytes[0] != '<') { 5511 const char* p = skip_over_field_name(bytes, false, length); 5512 legal = (p != NULL) && ((p - bytes) == (int)length); 5513 } 5514 } else { 5515 // 4881221: relax the constraints based on JSR202 spec 5516 legal = verify_unqualified_name(bytes, length, LegalField); 5517 } 5518 } 5519 5520 if (!legal) { 5521 ResourceMark rm(THREAD); 5522 assert(_class_name != NULL, "invariant"); 5523 Exceptions::fthrow( 5524 THREAD_AND_LOCATION, 5525 vmSymbols::java_lang_ClassFormatError(), 5526 "Illegal field name \"%s\" in class %s", bytes, 5527 _class_name->as_C_string() 5528 ); 5529 return; 5530 } 5531 } 5532 5533 // Checks if name is a legal method name. 5534 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5535 if (!_need_verify || _relax_verify) { return; } 5536 5537 assert(name != NULL, "method name is null"); 5538 char buf[fixed_buffer_size]; 5539 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5540 unsigned int length = name->utf8_length(); 5541 bool legal = false; 5542 5543 if (length > 0) { 5544 if (bytes[0] == '<') { 5545 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5546 legal = true; 5547 } 5548 } else if (_major_version < JAVA_1_5_VERSION) { 5549 const char* p; 5550 p = skip_over_field_name(bytes, false, length); 5551 legal = (p != NULL) && ((p - bytes) == (int)length); 5552 } else { 5553 // 4881221: relax the constraints based on JSR202 spec 5554 legal = verify_unqualified_name(bytes, length, LegalMethod); 5555 } 5556 } 5557 5558 if (!legal) { 5559 ResourceMark rm(THREAD); 5560 assert(_class_name != NULL, "invariant"); 5561 Exceptions::fthrow( 5562 THREAD_AND_LOCATION, 5563 vmSymbols::java_lang_ClassFormatError(), 5564 "Illegal method name \"%s\" in class %s", bytes, 5565 _class_name->as_C_string() 5566 ); 5567 return; 5568 } 5569 } 5570 5571 5572 // Checks if signature is a legal field signature. 5573 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5574 const Symbol* signature, 5575 TRAPS) const { 5576 if (!_need_verify) { return; } 5577 5578 char buf[fixed_buffer_size]; 5579 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5580 const unsigned int length = signature->utf8_length(); 5581 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5582 5583 if (p == NULL || (p - bytes) != (int)length) { 5584 throwIllegalSignature("Field", name, signature, CHECK); 5585 } 5586 } 5587 5588 // Checks if signature is a legal method signature. 5589 // Returns number of parameters 5590 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5591 const Symbol* signature, 5592 TRAPS) const { 5593 if (!_need_verify) { 5594 // make sure caller's args_size will be less than 0 even for non-static 5595 // method so it will be recomputed in compute_size_of_parameters(). 5596 return -2; 5597 } 5598 5599 // Class initializers cannot have args for class format version >= 51. 5600 if (name == vmSymbols::class_initializer_name() && 5601 signature != vmSymbols::void_method_signature() && 5602 _major_version >= JAVA_7_VERSION) { 5603 throwIllegalSignature("Method", name, signature, CHECK_0); 5604 return 0; 5605 } 5606 5607 unsigned int args_size = 0; 5608 char buf[fixed_buffer_size]; 5609 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5610 unsigned int length = signature->utf8_length(); 5611 const char* nextp; 5612 5613 // The first character must be a '(' 5614 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5615 length--; 5616 // Skip over legal field signatures 5617 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5618 while ((length > 0) && (nextp != NULL)) { 5619 args_size++; 5620 if (p[0] == 'J' || p[0] == 'D') { 5621 args_size++; 5622 } 5623 length -= nextp - p; 5624 p = nextp; 5625 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5626 } 5627 // The first non-signature thing better be a ')' 5628 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5629 length--; 5630 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5631 // All internal methods must return void 5632 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5633 return args_size; 5634 } 5635 } else { 5636 // Now we better just have a return value 5637 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5638 if (nextp && ((int)length == (nextp - p))) { 5639 return args_size; 5640 } 5641 } 5642 } 5643 } 5644 // Report error 5645 throwIllegalSignature("Method", name, signature, CHECK_0); 5646 return 0; 5647 } 5648 5649 int ClassFileParser::static_field_size() const { 5650 assert(_field_info != NULL, "invariant"); 5651 return _field_info->static_field_size; 5652 } 5653 5654 int ClassFileParser::total_oop_map_count() const { 5655 assert(_field_info != NULL, "invariant"); 5656 return _field_info->oop_map_blocks->nonstatic_oop_map_count; 5657 } 5658 5659 jint ClassFileParser::layout_size() const { 5660 assert(_field_info != NULL, "invariant"); 5661 return _field_info->instance_size; 5662 } 5663 5664 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5665 const Array<Method*>* methods) { 5666 assert(ik != NULL, "invariant"); 5667 assert(methods != NULL, "invariant"); 5668 5669 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5670 // (We used to do this lazily, but now we query it in Rewriter, 5671 // which is eagerly done for every method, so we might as well do it now, 5672 // when everything is fresh in memory.) 5673 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5674 5675 if (klass_id != vmSymbols::NO_SID) { 5676 for (int j = 0; j < methods->length(); ++j) { 5677 Method* method = methods->at(j); 5678 method->init_intrinsic_id(); 5679 5680 if (CheckIntrinsics) { 5681 // Check if an intrinsic is defined for method 'method', 5682 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5683 if (method->intrinsic_id() != vmIntrinsics::_none && 5684 !method->intrinsic_candidate()) { 5685 tty->print("Compiler intrinsic is defined for method [%s], " 5686 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5687 method->name_and_sig_as_C_string(), 5688 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5689 ); 5690 tty->cr(); 5691 DEBUG_ONLY(vm_exit(1)); 5692 } 5693 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5694 // but there is no intrinsic available for it. 5695 if (method->intrinsic_candidate() && 5696 method->intrinsic_id() == vmIntrinsics::_none) { 5697 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5698 "but no compiler intrinsic is defined for the method.%s", 5699 method->name_and_sig_as_C_string(), 5700 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5701 ); 5702 tty->cr(); 5703 DEBUG_ONLY(vm_exit(1)); 5704 } 5705 } 5706 } // end for 5707 5708 #ifdef ASSERT 5709 if (CheckIntrinsics) { 5710 // Check for orphan methods in the current class. A method m 5711 // of a class C is orphan if an intrinsic is defined for method m, 5712 // but class C does not declare m. 5713 // The check is potentially expensive, therefore it is available 5714 // only in debug builds. 5715 5716 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5717 if (vmIntrinsics::_compiledLambdaForm == id) { 5718 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5719 // generated for the JVM from a LambdaForm and therefore no method 5720 // is defined for it. 5721 continue; 5722 } 5723 5724 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5725 // Check if the current class contains a method with the same 5726 // name, flags, signature. 5727 bool match = false; 5728 for (int j = 0; j < methods->length(); ++j) { 5729 const Method* method = methods->at(j); 5730 if (method->intrinsic_id() == id) { 5731 match = true; 5732 break; 5733 } 5734 } 5735 5736 if (!match) { 5737 char buf[1000]; 5738 tty->print("Compiler intrinsic is defined for method [%s], " 5739 "but the method is not available in class [%s].%s", 5740 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5741 buf, sizeof(buf)), 5742 ik->name()->as_C_string(), 5743 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5744 ); 5745 tty->cr(); 5746 DEBUG_ONLY(vm_exit(1)); 5747 } 5748 } 5749 } // end for 5750 } // CheckIntrinsics 5751 #endif // ASSERT 5752 } 5753 } 5754 5755 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5756 if (_klass != NULL) { 5757 return _klass; 5758 } 5759 5760 InstanceKlass* const ik = 5761 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5762 5763 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5764 5765 assert(_klass == ik, "invariant"); 5766 5767 ik->set_has_passed_fingerprint_check(false); 5768 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5769 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5770 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) { 5771 // This class matches with a class saved in an AOT library 5772 ik->set_has_passed_fingerprint_check(true); 5773 } else { 5774 ResourceMark rm; 5775 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5776 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5777 } 5778 } 5779 5780 if (ik->is_value()) { 5781 ValueKlass* vk = ValueKlass::cast(ik); 5782 oop val = ik->allocate_instance(CHECK_NULL); 5783 vk->set_default_value(val); 5784 } 5785 5786 return ik; 5787 } 5788 5789 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5790 assert(ik != NULL, "invariant"); 5791 5792 // Set name and CLD before adding to CLD 5793 ik->set_class_loader_data(_loader_data); 5794 ik->set_name(_class_name); 5795 5796 // Add all classes to our internal class loader list here, 5797 // including classes in the bootstrap (NULL) class loader. 5798 const bool publicize = !is_internal(); 5799 5800 _loader_data->add_class(ik, publicize); 5801 5802 set_klass_to_deallocate(ik); 5803 5804 assert(_field_info != NULL, "invariant"); 5805 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5806 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->nonstatic_oop_map_count, 5807 "sanity"); 5808 5809 assert(ik->is_instance_klass(), "sanity"); 5810 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5811 5812 // Fill in information already parsed 5813 ik->set_should_verify_class(_need_verify); 5814 5815 // Not yet: supers are done below to support the new subtype-checking fields 5816 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5817 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5818 assert(_fac != NULL, "invariant"); 5819 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_FLATTENABLE]); 5820 5821 // this transfers ownership of a lot of arrays from 5822 // the parser onto the InstanceKlass* 5823 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5824 5825 // note that is not safe to use the fields in the parser from this point on 5826 assert(NULL == _cp, "invariant"); 5827 assert(NULL == _fields, "invariant"); 5828 assert(NULL == _methods, "invariant"); 5829 assert(NULL == _inner_classes, "invariant"); 5830 assert(NULL == _local_interfaces, "invariant"); 5831 assert(NULL == _combined_annotations, "invariant"); 5832 5833 if (_has_final_method) { 5834 ik->set_has_final_method(); 5835 } 5836 5837 ik->copy_method_ordering(_method_ordering, CHECK); 5838 // The InstanceKlass::_methods_jmethod_ids cache 5839 // is managed on the assumption that the initial cache 5840 // size is equal to the number of methods in the class. If 5841 // that changes, then InstanceKlass::idnum_can_increment() 5842 // has to be changed accordingly. 5843 ik->set_initial_method_idnum(ik->methods()->length()); 5844 5845 ik->set_this_class_index(_this_class_index); 5846 5847 if (is_anonymous()) { 5848 // _this_class_index is a CONSTANT_Class entry that refers to this 5849 // anonymous class itself. If this class needs to refer to its own methods or 5850 // fields, it would use a CONSTANT_MethodRef, etc, which would reference 5851 // _this_class_index. However, because this class is anonymous (it's 5852 // not stored in SystemDictionary), _this_class_index cannot be resolved 5853 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5854 // Therefore, we must eagerly resolve _this_class_index now. 5855 ik->constants()->klass_at_put(_this_class_index, ik); 5856 } 5857 5858 ik->set_minor_version(_minor_version); 5859 ik->set_major_version(_major_version); 5860 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5861 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5862 5863 if (_host_klass != NULL) { 5864 assert (ik->is_anonymous(), "should be the same"); 5865 ik->set_host_klass(_host_klass); 5866 } 5867 5868 // Set PackageEntry for this_klass 5869 oop cl = ik->class_loader(); 5870 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5871 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5872 ik->set_package(cld, CHECK); 5873 5874 const Array<Method*>* const methods = ik->methods(); 5875 assert(methods != NULL, "invariant"); 5876 const int methods_len = methods->length(); 5877 5878 check_methods_for_intrinsics(ik, methods); 5879 5880 // Fill in field values obtained by parse_classfile_attributes 5881 if (_parsed_annotations->has_any_annotations()) { 5882 _parsed_annotations->apply_to(ik); 5883 } 5884 5885 apply_parsed_class_attributes(ik); 5886 5887 // Miranda methods 5888 if ((_num_miranda_methods > 0) || 5889 // if this class introduced new miranda methods or 5890 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5891 // super class exists and this class inherited miranda methods 5892 ) { 5893 ik->set_has_miranda_methods(); // then set a flag 5894 } 5895 5896 // Fill in information needed to compute superclasses. 5897 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5898 ik->set_transitive_interfaces(_transitive_interfaces); 5899 _transitive_interfaces = NULL; 5900 5901 // Initialize itable offset tables 5902 klassItable::setup_itable_offset_table(ik); 5903 5904 // Compute transitive closure of interfaces this class implements 5905 // Do final class setup 5906 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks; 5907 if (oop_map_blocks->nonstatic_oop_map_count > 0) { 5908 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); 5909 } 5910 5911 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5912 set_precomputed_flags(ik, CHECK); 5913 5914 // check if this class can access its super class 5915 check_super_class_access(ik, CHECK); 5916 5917 // check if this class can access its superinterfaces 5918 check_super_interface_access(ik, CHECK); 5919 5920 // check if this class overrides any final method 5921 check_final_method_override(ik, CHECK); 5922 5923 // reject static interface methods prior to Java 8 5924 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5925 check_illegal_static_method(ik, CHECK); 5926 } 5927 5928 // Obtain this_klass' module entry 5929 ModuleEntry* module_entry = ik->module(); 5930 assert(module_entry != NULL, "module_entry should always be set"); 5931 5932 // Obtain java.lang.Module 5933 Handle module_handle(THREAD, module_entry->module()); 5934 5935 // Allocate mirror and initialize static fields 5936 // The create_mirror() call will also call compute_modifiers() 5937 java_lang_Class::create_mirror(ik, 5938 Handle(THREAD, _loader_data->class_loader()), 5939 module_handle, 5940 _protection_domain, 5941 CHECK); 5942 5943 assert(_all_mirandas != NULL, "invariant"); 5944 5945 // Generate any default methods - default methods are public interface methods 5946 // that have a default implementation. This is new with Java 8. 5947 if (_has_nonstatic_concrete_methods) { 5948 DefaultMethods::generate_default_methods(ik, 5949 _all_mirandas, 5950 CHECK); 5951 } 5952 5953 if (is_value_type()) { 5954 ValueKlass* vk = ValueKlass::cast(ik); 5955 vk->set_if_bufferable(); 5956 vk->initialize_calling_convention(); 5957 } 5958 5959 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5960 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5961 !module_entry->has_default_read_edges()) { 5962 if (!module_entry->set_has_default_read_edges()) { 5963 // We won a potential race 5964 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5965 } 5966 } 5967 5968 int nfields = ik->java_fields_count(); 5969 if (ik->is_value()) nfields++; 5970 for(int i = 0; i < nfields; i++) { 5971 if (ik->field_access_flags(i) & JVM_ACC_FLATTENABLE) { 5972 Klass* klass = SystemDictionary::resolve_or_fail(ik->field_signature(i), 5973 Handle(THREAD, ik->class_loader()), 5974 Handle(THREAD, ik->protection_domain()), true, CHECK); 5975 assert(klass != NULL, "Sanity check"); 5976 assert(klass->access_flags().is_value_type(), "Value type expected"); 5977 ik->set_value_field_klass(i, klass); 5978 } else if (is_value_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0) 5979 && ((ik->field_access_flags(i) & JVM_ACC_STATIC) != 0)) { 5980 ValueKlass::cast(ik)->set_default_value_offset(ik->field_offset(i)); 5981 } 5982 } 5983 5984 // Update the loader_data graph. 5985 record_defined_class_dependencies(ik, CHECK); 5986 5987 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5988 5989 if (!is_internal()) { 5990 if (log_is_enabled(Info, class, load)) { 5991 ResourceMark rm; 5992 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5993 ik->print_class_load_logging(_loader_data, module_name, _stream); 5994 } 5995 5996 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5997 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION && 5998 log_is_enabled(Info, class, preview)) { 5999 ResourceMark rm; 6000 log_info(class, preview)("Loading preview feature type %s", ik->external_name()); 6001 } 6002 6003 if (log_is_enabled(Debug, class, resolve)) { 6004 ResourceMark rm; 6005 // print out the superclass. 6006 const char * from = ik->external_name(); 6007 if (ik->java_super() != NULL) { 6008 log_debug(class, resolve)("%s %s (super)", 6009 from, 6010 ik->java_super()->external_name()); 6011 } 6012 // print out each of the interface classes referred to by this class. 6013 const Array<Klass*>* const local_interfaces = ik->local_interfaces(); 6014 if (local_interfaces != NULL) { 6015 const int length = local_interfaces->length(); 6016 for (int i = 0; i < length; i++) { 6017 const Klass* const k = local_interfaces->at(i); 6018 const char * to = k->external_name(); 6019 log_debug(class, resolve)("%s %s (interface)", from, to); 6020 } 6021 } 6022 } 6023 } 6024 6025 JFR_ONLY(INIT_ID(ik);) 6026 6027 // If we reach here, all is well. 6028 // Now remove the InstanceKlass* from the _klass_to_deallocate field 6029 // in order for it to not be destroyed in the ClassFileParser destructor. 6030 set_klass_to_deallocate(NULL); 6031 6032 // it's official 6033 set_klass(ik); 6034 6035 debug_only(ik->verify();) 6036 } 6037 6038 // For an anonymous class that is in the unnamed package, move it to its host class's 6039 // package by prepending its host class's package name to its class name and setting 6040 // its _class_name field. 6041 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) { 6042 ResourceMark rm(THREAD); 6043 assert(strrchr(_class_name->as_C_string(), '/') == NULL, 6044 "Anonymous class should not be in a package"); 6045 const char* host_pkg_name = 6046 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL); 6047 6048 if (host_pkg_name != NULL) { 6049 size_t host_pkg_len = strlen(host_pkg_name); 6050 int class_name_len = _class_name->utf8_length(); 6051 char* new_anon_name = 6052 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len); 6053 // Copy host package name and trailing /. 6054 strncpy(new_anon_name, host_pkg_name, host_pkg_len); 6055 new_anon_name[host_pkg_len] = '/'; 6056 // Append anonymous class name. The anonymous class name can contain odd 6057 // characters. So, do a strncpy instead of using sprintf("%s..."). 6058 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len); 6059 6060 // Create a symbol and update the anonymous class name. 6061 _class_name = SymbolTable::new_symbol(new_anon_name, 6062 (int)host_pkg_len + 1 + class_name_len, 6063 CHECK); 6064 } 6065 } 6066 6067 // If the host class and the anonymous class are in the same package then do 6068 // nothing. If the anonymous class is in the unnamed package then move it to its 6069 // host's package. If the classes are in different packages then throw an IAE 6070 // exception. 6071 void ClassFileParser::fix_anonymous_class_name(TRAPS) { 6072 assert(_host_klass != NULL, "Expected an anonymous class"); 6073 6074 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(), 6075 _class_name->utf8_length(), '/'); 6076 if (anon_last_slash == NULL) { // Unnamed package 6077 prepend_host_package_name(_host_klass, CHECK); 6078 } else { 6079 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) { 6080 ResourceMark rm(THREAD); 6081 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 6082 err_msg("Host class %s and anonymous class %s are in different packages", 6083 _host_klass->name()->as_C_string(), _class_name->as_C_string())); 6084 } 6085 } 6086 } 6087 6088 static bool relax_format_check_for(ClassLoaderData* loader_data) { 6089 bool trusted = (loader_data->is_the_null_class_loader_data() || 6090 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 6091 bool need_verify = 6092 // verifyAll 6093 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 6094 // verifyRemote 6095 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 6096 return !need_verify; 6097 } 6098 6099 ClassFileParser::ClassFileParser(ClassFileStream* stream, 6100 Symbol* name, 6101 ClassLoaderData* loader_data, 6102 Handle protection_domain, 6103 const InstanceKlass* host_klass, 6104 GrowableArray<Handle>* cp_patches, 6105 Publicity pub_level, 6106 TRAPS) : 6107 _stream(stream), 6108 _requested_name(name), 6109 _loader_data(loader_data), 6110 _host_klass(host_klass), 6111 _cp_patches(cp_patches), 6112 _num_patched_klasses(0), 6113 _max_num_patched_klasses(0), 6114 _orig_cp_size(0), 6115 _first_patched_klass_resolved_index(0), 6116 _super_klass(), 6117 _cp(NULL), 6118 _fields(NULL), 6119 _methods(NULL), 6120 _inner_classes(NULL), 6121 _value_types(NULL), 6122 _local_interfaces(NULL), 6123 _transitive_interfaces(NULL), 6124 _combined_annotations(NULL), 6125 _annotations(NULL), 6126 _type_annotations(NULL), 6127 _fields_annotations(NULL), 6128 _fields_type_annotations(NULL), 6129 _klass(NULL), 6130 _klass_to_deallocate(NULL), 6131 _parsed_annotations(NULL), 6132 _fac(NULL), 6133 _field_info(NULL), 6134 _method_ordering(NULL), 6135 _all_mirandas(NULL), 6136 _vtable_size(0), 6137 _itable_size(0), 6138 _num_miranda_methods(0), 6139 _rt(REF_NONE), 6140 _protection_domain(protection_domain), 6141 _access_flags(), 6142 _pub_level(pub_level), 6143 _bad_constant_seen(0), 6144 _synthetic_flag(false), 6145 _sde_length(false), 6146 _sde_buffer(NULL), 6147 _sourcefile_index(0), 6148 _generic_signature_index(0), 6149 _major_version(0), 6150 _minor_version(0), 6151 _this_class_index(0), 6152 _super_class_index(0), 6153 _itfs_len(0), 6154 _java_fields_count(0), 6155 _need_verify(false), 6156 _relax_verify(false), 6157 _has_nonstatic_concrete_methods(false), 6158 _declares_nonstatic_concrete_methods(false), 6159 _has_final_method(false), 6160 _has_finalizer(false), 6161 _has_empty_finalizer(false), 6162 _has_vanilla_constructor(false), 6163 _max_bootstrap_specifier_index(-1), 6164 _has_flattenable_fields(false) { 6165 6166 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 6167 6168 assert(THREAD->is_Java_thread(), "invariant"); 6169 assert(_loader_data != NULL, "invariant"); 6170 assert(stream != NULL, "invariant"); 6171 assert(_stream != NULL, "invariant"); 6172 assert(_stream->buffer() == _stream->current(), "invariant"); 6173 assert(_class_name != NULL, "invariant"); 6174 assert(0 == _access_flags.as_int(), "invariant"); 6175 6176 // Figure out whether we can skip format checking (matching classic VM behavior) 6177 if (DumpSharedSpaces) { 6178 // verify == true means it's a 'remote' class (i.e., non-boot class) 6179 // Verification decision is based on BytecodeVerificationRemote flag 6180 // for those classes. 6181 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 6182 BytecodeVerificationLocal; 6183 } 6184 else { 6185 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 6186 stream->need_verify()); 6187 } 6188 if (_cp_patches != NULL) { 6189 int len = _cp_patches->length(); 6190 for (int i=0; i<len; i++) { 6191 if (has_cp_patch_at(i)) { 6192 Handle patch = cp_patch_at(i); 6193 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 6194 // We need to append the names of the patched classes to the end of the constant pool, 6195 // because a patched class may have a Utf8 name that's not already included in the 6196 // original constant pool. These class names are used when patch_constant_pool() 6197 // calls patch_class(). 6198 // 6199 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 6200 // At this point, we don't know the tag for index i yet, because we haven't parsed the 6201 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 6202 _max_num_patched_klasses++; 6203 } 6204 } 6205 } 6206 } 6207 6208 // synch back verification state to stream 6209 stream->set_verify(_need_verify); 6210 6211 // Check if verification needs to be relaxed for this class file 6212 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 6213 _relax_verify = relax_format_check_for(_loader_data); 6214 6215 parse_stream(stream, CHECK); 6216 6217 post_process_parsed_stream(stream, _cp, CHECK); 6218 } 6219 6220 void ClassFileParser::clear_class_metadata() { 6221 // metadata created before the instance klass is created. Must be 6222 // deallocated if classfile parsing returns an error. 6223 _cp = NULL; 6224 _fields = NULL; 6225 _methods = NULL; 6226 _inner_classes = NULL; 6227 _local_interfaces = NULL; 6228 _combined_annotations = NULL; 6229 _annotations = _type_annotations = NULL; 6230 _fields_annotations = _fields_type_annotations = NULL; 6231 } 6232 6233 // Destructor to clean up 6234 ClassFileParser::~ClassFileParser() { 6235 if (_cp != NULL) { 6236 MetadataFactory::free_metadata(_loader_data, _cp); 6237 } 6238 if (_fields != NULL) { 6239 MetadataFactory::free_array<u2>(_loader_data, _fields); 6240 } 6241 6242 if (_methods != NULL) { 6243 // Free methods 6244 InstanceKlass::deallocate_methods(_loader_data, _methods); 6245 } 6246 6247 // beware of the Universe::empty_blah_array!! 6248 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 6249 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 6250 } 6251 6252 // Free interfaces 6253 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 6254 _local_interfaces, _transitive_interfaces); 6255 6256 if (_combined_annotations != NULL) { 6257 // After all annotations arrays have been created, they are installed into the 6258 // Annotations object that will be assigned to the InstanceKlass being created. 6259 6260 // Deallocate the Annotations object and the installed annotations arrays. 6261 _combined_annotations->deallocate_contents(_loader_data); 6262 6263 // If the _combined_annotations pointer is non-NULL, 6264 // then the other annotations fields should have been cleared. 6265 assert(_annotations == NULL, "Should have been cleared"); 6266 assert(_type_annotations == NULL, "Should have been cleared"); 6267 assert(_fields_annotations == NULL, "Should have been cleared"); 6268 assert(_fields_type_annotations == NULL, "Should have been cleared"); 6269 } else { 6270 // If the annotations arrays were not installed into the Annotations object, 6271 // then they have to be deallocated explicitly. 6272 MetadataFactory::free_array<u1>(_loader_data, _annotations); 6273 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 6274 Annotations::free_contents(_loader_data, _fields_annotations); 6275 Annotations::free_contents(_loader_data, _fields_type_annotations); 6276 } 6277 6278 clear_class_metadata(); 6279 _transitive_interfaces = NULL; 6280 6281 // deallocate the klass if already created. Don't directly deallocate, but add 6282 // to the deallocate list so that the klass is removed from the CLD::_klasses list 6283 // at a safepoint. 6284 if (_klass_to_deallocate != NULL) { 6285 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 6286 } 6287 } 6288 6289 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 6290 TRAPS) { 6291 6292 assert(stream != NULL, "invariant"); 6293 assert(_class_name != NULL, "invariant"); 6294 6295 // BEGIN STREAM PARSING 6296 stream->guarantee_more(8, CHECK); // magic, major, minor 6297 // Magic value 6298 const u4 magic = stream->get_u4_fast(); 6299 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 6300 "Incompatible magic value %u in class file %s", 6301 magic, CHECK); 6302 6303 // Version numbers 6304 _minor_version = stream->get_u2_fast(); 6305 _major_version = stream->get_u2_fast(); 6306 6307 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) { 6308 ResourceMark rm; 6309 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 6310 _major_version, _minor_version, _class_name->as_C_string()); 6311 Exceptions::fthrow( 6312 THREAD_AND_LOCATION, 6313 vmSymbols::java_lang_UnsupportedClassVersionError(), 6314 "Unsupported major.minor version for dump time %u.%u", 6315 _major_version, 6316 _minor_version); 6317 } 6318 6319 // Check version numbers - we check this even with verifier off 6320 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 6321 6322 stream->guarantee_more(3, CHECK); // length, first cp tag 6323 u2 cp_size = stream->get_u2_fast(); 6324 6325 guarantee_property( 6326 cp_size >= 1, "Illegal constant pool size %u in class file %s", 6327 cp_size, CHECK); 6328 6329 _orig_cp_size = cp_size; 6330 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 6331 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 6332 } 6333 cp_size += _max_num_patched_klasses; 6334 6335 _cp = ConstantPool::allocate(_loader_data, 6336 cp_size, 6337 CHECK); 6338 6339 ConstantPool* const cp = _cp; 6340 6341 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 6342 6343 assert(cp_size == (const u2)cp->length(), "invariant"); 6344 6345 // ACCESS FLAGS 6346 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 6347 6348 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS; 6349 // JVM_ACC_MODULE is defined in JDK-9 and later. 6350 if (_major_version >= JAVA_9_VERSION) { 6351 recognized_modifiers |= JVM_ACC_MODULE; 6352 } 6353 // JVM_ACC_VALUE is defined for class file version 55 and later 6354 if (supports_value_types()) { 6355 recognized_modifiers |= JVM_ACC_VALUE; 6356 } 6357 6358 // Access flags 6359 jint flags = stream->get_u2_fast() & recognized_modifiers; 6360 6361 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 6362 // Set abstract bit for old class files for backward compatibility 6363 flags |= JVM_ACC_ABSTRACT; 6364 } 6365 6366 verify_legal_class_modifiers(flags, CHECK); 6367 6368 short bad_constant = class_bad_constant_seen(); 6369 if (bad_constant != 0) { 6370 // Do not throw CFE until after the access_flags are checked because if 6371 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 6372 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 6373 } 6374 6375 _access_flags.set_flags(flags); 6376 6377 // This class and superclass 6378 _this_class_index = stream->get_u2_fast(); 6379 check_property( 6380 valid_cp_range(_this_class_index, cp_size) && 6381 cp->tag_at(_this_class_index).is_unresolved_klass(), 6382 "Invalid this class index %u in constant pool in class file %s", 6383 _this_class_index, CHECK); 6384 6385 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6386 assert(class_name_in_cp != NULL, "class_name can't be null"); 6387 6388 // Update _class_name which could be null previously 6389 // to reflect the name in the constant pool 6390 _class_name = class_name_in_cp; 6391 6392 // Don't need to check whether this class name is legal or not. 6393 // It has been checked when constant pool is parsed. 6394 // However, make sure it is not an array type. 6395 if (_need_verify) { 6396 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 6397 "Bad class name in class file %s", 6398 CHECK); 6399 } 6400 6401 // Checks if name in class file matches requested name 6402 if (_requested_name != NULL && _requested_name != _class_name) { 6403 ResourceMark rm(THREAD); 6404 Exceptions::fthrow( 6405 THREAD_AND_LOCATION, 6406 vmSymbols::java_lang_NoClassDefFoundError(), 6407 "%s (wrong name: %s)", 6408 _class_name->as_C_string(), 6409 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 6410 ); 6411 return; 6412 } 6413 6414 // if this is an anonymous class fix up its name if it's in the unnamed 6415 // package. Otherwise, throw IAE if it is in a different package than 6416 // its host class. 6417 if (_host_klass != NULL) { 6418 fix_anonymous_class_name(CHECK); 6419 } 6420 6421 // Verification prevents us from creating names with dots in them, this 6422 // asserts that that's the case. 6423 assert(is_internal_format(_class_name), "external class name format used internally"); 6424 6425 if (!is_internal()) { 6426 LogTarget(Debug, class, preorder) lt; 6427 if (lt.is_enabled()){ 6428 ResourceMark rm(THREAD); 6429 LogStream ls(lt); 6430 ls.print("%s", _class_name->as_klass_external_name()); 6431 if (stream->source() != NULL) { 6432 ls.print(" source: %s", stream->source()); 6433 } 6434 ls.cr(); 6435 } 6436 6437 #if INCLUDE_CDS 6438 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6439 if (!ClassLoader::has_jrt_entry()) { 6440 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6441 DumpLoadedClassList = NULL; 6442 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6443 _host_klass == NULL) { 6444 // Only dump the classes that can be stored into CDS archive. 6445 // Anonymous classes such as generated LambdaForm classes are also not included. 6446 oop class_loader = _loader_data->class_loader(); 6447 ResourceMark rm(THREAD); 6448 bool skip = false; 6449 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6450 // For the boot and platform class loaders, skip classes that are not found in the 6451 // java runtime image, such as those found in the --patch-module entries. 6452 // These classes can't be loaded from the archive during runtime. 6453 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) { 6454 skip = true; 6455 } 6456 6457 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6458 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6459 // as they can be loaded from the archive during runtime. 6460 skip = false; 6461 } 6462 } 6463 if (skip) { 6464 tty->print_cr("skip writing class %s from source %s to classlist file", 6465 _class_name->as_C_string(), stream->source()); 6466 } else { 6467 classlist_file->print_cr("%s", _class_name->as_C_string()); 6468 classlist_file->flush(); 6469 } 6470 } 6471 } 6472 #endif 6473 } 6474 6475 // SUPERKLASS 6476 _super_class_index = stream->get_u2_fast(); 6477 _super_klass = parse_super_class(cp, 6478 _super_class_index, 6479 _need_verify, 6480 CHECK); 6481 6482 // Interfaces 6483 _itfs_len = stream->get_u2_fast(); 6484 parse_interfaces(stream, 6485 _itfs_len, 6486 cp, 6487 &_has_nonstatic_concrete_methods, 6488 CHECK); 6489 6490 assert(_local_interfaces != NULL, "invariant"); 6491 6492 // Fields (offsets are filled in later) 6493 _fac = new FieldAllocationCount(); 6494 parse_fields(stream, 6495 _access_flags.is_interface(), 6496 _access_flags.is_value_type(), 6497 _fac, 6498 cp, 6499 cp_size, 6500 &_java_fields_count, 6501 CHECK); 6502 6503 assert(_fields != NULL, "invariant"); 6504 6505 // Methods 6506 AccessFlags promoted_flags; 6507 parse_methods(stream, 6508 _access_flags.is_interface(), 6509 _access_flags.is_value_type(), 6510 &promoted_flags, 6511 &_has_final_method, 6512 &_declares_nonstatic_concrete_methods, 6513 CHECK); 6514 6515 assert(_methods != NULL, "invariant"); 6516 6517 // promote flags from parse_methods() to the klass' flags 6518 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6519 6520 if (_declares_nonstatic_concrete_methods) { 6521 _has_nonstatic_concrete_methods = true; 6522 } 6523 6524 // Additional attributes/annotations 6525 _parsed_annotations = new ClassAnnotationCollector(); 6526 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6527 6528 assert(_inner_classes != NULL, "invariant"); 6529 6530 // Finalize the Annotations metadata object, 6531 // now that all annotation arrays have been created. 6532 create_combined_annotations(CHECK); 6533 6534 // Make sure this is the end of class file stream 6535 guarantee_property(stream->at_eos(), 6536 "Extra bytes at the end of class file %s", 6537 CHECK); 6538 6539 // all bytes in stream read and parsed 6540 } 6541 6542 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6543 ConstantPool* cp, 6544 TRAPS) { 6545 assert(stream != NULL, "invariant"); 6546 assert(stream->at_eos(), "invariant"); 6547 assert(cp != NULL, "invariant"); 6548 assert(_loader_data != NULL, "invariant"); 6549 6550 if (_class_name == vmSymbols::java_lang_Object()) { 6551 check_property(_local_interfaces == Universe::the_empty_klass_array(), 6552 "java.lang.Object cannot implement an interface in class file %s", 6553 CHECK); 6554 } 6555 // We check super class after class file is parsed and format is checked 6556 if (_super_class_index > 0 && NULL ==_super_klass) { 6557 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6558 if (_access_flags.is_interface()) { 6559 // Before attempting to resolve the superclass, check for class format 6560 // errors not checked yet. 6561 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6562 "Interfaces must have java.lang.Object as superclass in class file %s", 6563 CHECK); 6564 } 6565 Handle loader(THREAD, _loader_data->class_loader()); 6566 _super_klass = (const InstanceKlass*) 6567 SystemDictionary::resolve_super_or_fail(_class_name, 6568 super_class_name, 6569 loader, 6570 _protection_domain, 6571 true, 6572 CHECK); 6573 } 6574 6575 if (_super_klass != NULL) { 6576 if (_super_klass->has_nonstatic_concrete_methods()) { 6577 _has_nonstatic_concrete_methods = true; 6578 } 6579 6580 if (_super_klass->is_interface()) { 6581 ResourceMark rm(THREAD); 6582 Exceptions::fthrow( 6583 THREAD_AND_LOCATION, 6584 vmSymbols::java_lang_IncompatibleClassChangeError(), 6585 "class %s has interface %s as super class", 6586 _class_name->as_klass_external_name(), 6587 _super_klass->external_name() 6588 ); 6589 return; 6590 } 6591 6592 // For a value class, only java/lang/Object is an acceptable super class 6593 if (_access_flags.get_flags() & JVM_ACC_VALUE) { 6594 guarantee_property(_super_klass->name() == vmSymbols::java_lang_Object(), 6595 "Value type must have java.lang.Object as superclass in class file %s", 6596 CHECK); 6597 } 6598 6599 // Make sure super class is not final 6600 if (_super_klass->is_final()) { 6601 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6602 } 6603 } 6604 6605 // Compute the transitive list of all unique interfaces implemented by this class 6606 _transitive_interfaces = 6607 compute_transitive_interfaces(_super_klass, 6608 _local_interfaces, 6609 _loader_data, 6610 CHECK); 6611 6612 assert(_transitive_interfaces != NULL, "invariant"); 6613 6614 // sort methods 6615 _method_ordering = sort_methods(_methods); 6616 6617 _all_mirandas = new GrowableArray<Method*>(20); 6618 6619 Handle loader(THREAD, _loader_data->class_loader()); 6620 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6621 &_num_miranda_methods, 6622 _all_mirandas, 6623 _super_klass, 6624 _methods, 6625 _access_flags, 6626 _major_version, 6627 loader, 6628 _class_name, 6629 _local_interfaces, 6630 CHECK); 6631 6632 // Size of Java itable (in words) 6633 _itable_size = _access_flags.is_interface() ? 0 : 6634 klassItable::compute_itable_size(_transitive_interfaces); 6635 6636 assert(_fac != NULL, "invariant"); 6637 assert(_parsed_annotations != NULL, "invariant"); 6638 6639 _field_info = new FieldLayoutInfo(); 6640 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6641 6642 // Compute reference typ 6643 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6644 6645 } 6646 6647 void ClassFileParser::set_klass(InstanceKlass* klass) { 6648 6649 #ifdef ASSERT 6650 if (klass != NULL) { 6651 assert(NULL == _klass, "leaking?"); 6652 } 6653 #endif 6654 6655 _klass = klass; 6656 } 6657 6658 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6659 6660 #ifdef ASSERT 6661 if (klass != NULL) { 6662 assert(NULL == _klass_to_deallocate, "leaking?"); 6663 } 6664 #endif 6665 6666 _klass_to_deallocate = klass; 6667 } 6668 6669 // Caller responsible for ResourceMark 6670 // clone stream with rewound position 6671 const ClassFileStream* ClassFileParser::clone_stream() const { 6672 assert(_stream != NULL, "invariant"); 6673 6674 return _stream->clone(); 6675 } 6676 6677 // ---------------------------------------------------------------------------- 6678 // debugging 6679 6680 #ifdef ASSERT 6681 6682 // return true if class_name contains no '.' (internal format is '/') 6683 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6684 if (class_name != NULL) { 6685 ResourceMark rm; 6686 char* name = class_name->as_C_string(); 6687 return strchr(name, '.') == NULL; 6688 } else { 6689 return true; 6690 } 6691 } 6692 6693 #endif