1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 #include "precompiled.hpp" 25 #include "jvm.h" 26 #include "aot/aotLoader.hpp" 27 #include "classfile/classFileParser.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/defaultMethods.hpp" 32 #include "classfile/dictionary.hpp" 33 #include "classfile/javaClasses.inline.hpp" 34 #include "classfile/moduleEntry.hpp" 35 #include "classfile/symbolTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/verificationType.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/allocation.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/oopFactory.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/annotations.hpp" 48 #include "oops/constantPool.inline.hpp" 49 #include "oops/fieldStreams.hpp" 50 #include "oops/instanceKlass.hpp" 51 #include "oops/instanceMirrorKlass.hpp" 52 #include "oops/klass.inline.hpp" 53 #include "oops/klassVtable.hpp" 54 #include "oops/metadata.hpp" 55 #include "oops/method.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "oops/symbol.hpp" 58 #include "prims/jvmtiExport.hpp" 59 #include "prims/jvmtiThreadState.hpp" 60 #include "runtime/arguments.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/perfData.hpp" 64 #include "runtime/reflection.hpp" 65 #include "runtime/safepointVerifiers.hpp" 66 #include "runtime/signature.hpp" 67 #include "runtime/timer.hpp" 68 #include "services/classLoadingService.hpp" 69 #include "services/threadService.hpp" 70 #include "utilities/align.hpp" 71 #include "utilities/bitMap.inline.hpp" 72 #include "utilities/copy.hpp" 73 #include "utilities/exceptions.hpp" 74 #include "utilities/globalDefinitions.hpp" 75 #include "utilities/growableArray.hpp" 76 #include "utilities/macros.hpp" 77 #include "utilities/ostream.hpp" 78 #include "utilities/resourceHash.hpp" 79 #if INCLUDE_CDS 80 #include "classfile/systemDictionaryShared.hpp" 81 #endif 82 #if INCLUDE_JFR 83 #include "jfr/support/jfrTraceIdExtension.hpp" 84 #endif 85 86 // We generally try to create the oops directly when parsing, rather than 87 // allocating temporary data structures and copying the bytes twice. A 88 // temporary area is only needed when parsing utf8 entries in the constant 89 // pool and when parsing line number tables. 90 91 // We add assert in debug mode when class format is not checked. 92 93 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 94 #define JAVA_MIN_SUPPORTED_VERSION 45 95 #define JAVA_PREVIEW_MINOR_VERSION 65535 96 97 // Used for two backward compatibility reasons: 98 // - to check for new additions to the class file format in JDK1.5 99 // - to check for bug fixes in the format checker in JDK1.5 100 #define JAVA_1_5_VERSION 49 101 102 // Used for backward compatibility reasons: 103 // - to check for javac bug fixes that happened after 1.5 104 // - also used as the max version when running in jdk6 105 #define JAVA_6_VERSION 50 106 107 // Used for backward compatibility reasons: 108 // - to disallow argument and require ACC_STATIC for <clinit> methods 109 #define JAVA_7_VERSION 51 110 111 // Extension method support. 112 #define JAVA_8_VERSION 52 113 114 #define JAVA_9_VERSION 53 115 116 #define JAVA_10_VERSION 54 117 118 #define JAVA_11_VERSION 55 119 120 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { 121 assert((bad_constant == 19 || bad_constant == 20) && _major_version >= JAVA_9_VERSION, 122 "Unexpected bad constant pool entry"); 123 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; 124 } 125 126 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, 127 ConstantPool* cp, 128 const int length, 129 TRAPS) { 130 assert(stream != NULL, "invariant"); 131 assert(cp != NULL, "invariant"); 132 133 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 134 // this function (_current can be allocated in a register, with scalar 135 // replacement of aggregates). The _current pointer is copied back to 136 // stream() when this function returns. DON'T call another method within 137 // this method that uses stream(). 138 const ClassFileStream cfs1 = *stream; 139 const ClassFileStream* const cfs = &cfs1; 140 141 assert(cfs->allocated_on_stack(), "should be local"); 142 debug_only(const u1* const old_current = stream->current();) 143 144 // Used for batching symbol allocations. 145 const char* names[SymbolTable::symbol_alloc_batch_size]; 146 int lengths[SymbolTable::symbol_alloc_batch_size]; 147 int indices[SymbolTable::symbol_alloc_batch_size]; 148 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 149 int names_count = 0; 150 151 // parsing Index 0 is unused 152 for (int index = 1; index < length; index++) { 153 // Each of the following case guarantees one more byte in the stream 154 // for the following tag or the access_flags following constant pool, 155 // so we don't need bounds-check for reading tag. 156 const u1 tag = cfs->get_u1_fast(); 157 switch (tag) { 158 case JVM_CONSTANT_Class : { 159 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 160 const u2 name_index = cfs->get_u2_fast(); 161 cp->klass_index_at_put(index, name_index); 162 break; 163 } 164 case JVM_CONSTANT_Fieldref: { 165 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 166 const u2 class_index = cfs->get_u2_fast(); 167 const u2 name_and_type_index = cfs->get_u2_fast(); 168 cp->field_at_put(index, class_index, name_and_type_index); 169 break; 170 } 171 case JVM_CONSTANT_Methodref: { 172 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 173 const u2 class_index = cfs->get_u2_fast(); 174 const u2 name_and_type_index = cfs->get_u2_fast(); 175 cp->method_at_put(index, class_index, name_and_type_index); 176 break; 177 } 178 case JVM_CONSTANT_InterfaceMethodref: { 179 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 180 const u2 class_index = cfs->get_u2_fast(); 181 const u2 name_and_type_index = cfs->get_u2_fast(); 182 cp->interface_method_at_put(index, class_index, name_and_type_index); 183 break; 184 } 185 case JVM_CONSTANT_String : { 186 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 187 const u2 string_index = cfs->get_u2_fast(); 188 cp->string_index_at_put(index, string_index); 189 break; 190 } 191 case JVM_CONSTANT_MethodHandle : 192 case JVM_CONSTANT_MethodType: { 193 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 194 classfile_parse_error( 195 "Class file version does not support constant tag %u in class file %s", 196 tag, CHECK); 197 } 198 if (tag == JVM_CONSTANT_MethodHandle) { 199 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 200 const u1 ref_kind = cfs->get_u1_fast(); 201 const u2 method_index = cfs->get_u2_fast(); 202 cp->method_handle_index_at_put(index, ref_kind, method_index); 203 } 204 else if (tag == JVM_CONSTANT_MethodType) { 205 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 206 const u2 signature_index = cfs->get_u2_fast(); 207 cp->method_type_index_at_put(index, signature_index); 208 } 209 else { 210 ShouldNotReachHere(); 211 } 212 break; 213 } 214 case JVM_CONSTANT_Dynamic : { 215 if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { 216 classfile_parse_error( 217 "Class file version does not support constant tag %u in class file %s", 218 tag, CHECK); 219 } 220 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 221 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 222 const u2 name_and_type_index = cfs->get_u2_fast(); 223 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 224 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 225 } 226 cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); 227 break; 228 } 229 case JVM_CONSTANT_InvokeDynamic : { 230 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 231 classfile_parse_error( 232 "Class file version does not support constant tag %u in class file %s", 233 tag, CHECK); 234 } 235 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 236 const u2 bootstrap_specifier_index = cfs->get_u2_fast(); 237 const u2 name_and_type_index = cfs->get_u2_fast(); 238 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { 239 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 240 } 241 cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 242 break; 243 } 244 case JVM_CONSTANT_Integer: { 245 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 246 const u4 bytes = cfs->get_u4_fast(); 247 cp->int_at_put(index, (jint)bytes); 248 break; 249 } 250 case JVM_CONSTANT_Float: { 251 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 252 const u4 bytes = cfs->get_u4_fast(); 253 cp->float_at_put(index, *(jfloat*)&bytes); 254 break; 255 } 256 case JVM_CONSTANT_Long: { 257 // A mangled type might cause you to overrun allocated memory 258 guarantee_property(index + 1 < length, 259 "Invalid constant pool entry %u in class file %s", 260 index, 261 CHECK); 262 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 263 const u8 bytes = cfs->get_u8_fast(); 264 cp->long_at_put(index, bytes); 265 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 266 break; 267 } 268 case JVM_CONSTANT_Double: { 269 // A mangled type might cause you to overrun allocated memory 270 guarantee_property(index+1 < length, 271 "Invalid constant pool entry %u in class file %s", 272 index, 273 CHECK); 274 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 275 const u8 bytes = cfs->get_u8_fast(); 276 cp->double_at_put(index, *(jdouble*)&bytes); 277 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 278 break; 279 } 280 case JVM_CONSTANT_NameAndType: { 281 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 282 const u2 name_index = cfs->get_u2_fast(); 283 const u2 signature_index = cfs->get_u2_fast(); 284 cp->name_and_type_at_put(index, name_index, signature_index); 285 break; 286 } 287 case JVM_CONSTANT_Utf8 : { 288 cfs->guarantee_more(2, CHECK); // utf8_length 289 u2 utf8_length = cfs->get_u2_fast(); 290 const u1* utf8_buffer = cfs->current(); 291 assert(utf8_buffer != NULL, "null utf8 buffer"); 292 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 293 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 294 cfs->skip_u1_fast(utf8_length); 295 296 // Before storing the symbol, make sure it's legal 297 if (_need_verify) { 298 verify_legal_utf8(utf8_buffer, utf8_length, CHECK); 299 } 300 301 if (has_cp_patch_at(index)) { 302 Handle patch = clear_cp_patch_at(index); 303 guarantee_property(java_lang_String::is_instance(patch()), 304 "Illegal utf8 patch at %d in class file %s", 305 index, 306 CHECK); 307 const char* const str = java_lang_String::as_utf8_string(patch()); 308 // (could use java_lang_String::as_symbol instead, but might as well batch them) 309 utf8_buffer = (const u1*) str; 310 utf8_length = (int) strlen(str); 311 } 312 313 unsigned int hash; 314 Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, 315 utf8_length, 316 hash); 317 if (result == NULL) { 318 names[names_count] = (const char*)utf8_buffer; 319 lengths[names_count] = utf8_length; 320 indices[names_count] = index; 321 hashValues[names_count++] = hash; 322 if (names_count == SymbolTable::symbol_alloc_batch_size) { 323 SymbolTable::new_symbols(_loader_data, 324 cp, 325 names_count, 326 names, 327 lengths, 328 indices, 329 hashValues, 330 CHECK); 331 names_count = 0; 332 } 333 } else { 334 cp->symbol_at_put(index, result); 335 } 336 break; 337 } 338 case 19: 339 case 20: { 340 // Record that an error occurred in these two cases but keep parsing so 341 // that ACC_Module can be checked for in the access_flags. Need to 342 // throw NoClassDefFoundError in that case. 343 if (_major_version >= JAVA_9_VERSION) { 344 cfs->guarantee_more(3, CHECK); 345 cfs->get_u2_fast(); 346 set_class_bad_constant_seen(tag); 347 break; 348 } 349 } 350 default: { 351 classfile_parse_error("Unknown constant tag %u in class file %s", 352 tag, 353 CHECK); 354 break; 355 } 356 } // end of switch(tag) 357 } // end of for 358 359 // Allocate the remaining symbols 360 if (names_count > 0) { 361 SymbolTable::new_symbols(_loader_data, 362 cp, 363 names_count, 364 names, 365 lengths, 366 indices, 367 hashValues, 368 CHECK); 369 } 370 371 // Copy _current pointer of local copy back to stream. 372 assert(stream->current() == old_current, "non-exclusive use of stream"); 373 stream->set_current(cfs1.current()); 374 375 } 376 377 static inline bool valid_cp_range(int index, int length) { 378 return (index > 0 && index < length); 379 } 380 381 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { 382 assert(cp != NULL, "invariant"); 383 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { 384 return cp->symbol_at(index); 385 } 386 return NULL; 387 } 388 389 #ifdef ASSERT 390 PRAGMA_DIAG_PUSH 391 PRAGMA_FORMAT_NONLITERAL_IGNORED 392 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const { 393 ResourceMark rm(THREAD); 394 fatal(msg, _class_name->as_C_string()); 395 } 396 397 void ClassFileParser::report_assert_property_failure(const char* msg, 398 int index, 399 TRAPS) const { 400 ResourceMark rm(THREAD); 401 fatal(msg, index, _class_name->as_C_string()); 402 } 403 PRAGMA_DIAG_POP 404 #endif 405 406 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, 407 ConstantPool* const cp, 408 const int length, 409 TRAPS) { 410 assert(cp != NULL, "invariant"); 411 assert(stream != NULL, "invariant"); 412 413 // parsing constant pool entries 414 parse_constant_pool_entries(stream, cp, length, CHECK); 415 if (class_bad_constant_seen() != 0) { 416 // a bad CP entry has been detected previously so stop parsing and just return. 417 return; 418 } 419 420 int index = 1; // declared outside of loops for portability 421 int num_klasses = 0; 422 423 // first verification pass - validate cross references 424 // and fixup class and string constants 425 for (index = 1; index < length; index++) { // Index 0 is unused 426 const jbyte tag = cp->tag_at(index).value(); 427 switch (tag) { 428 case JVM_CONSTANT_Class: { 429 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 430 break; 431 } 432 case JVM_CONSTANT_Fieldref: 433 // fall through 434 case JVM_CONSTANT_Methodref: 435 // fall through 436 case JVM_CONSTANT_InterfaceMethodref: { 437 if (!_need_verify) break; 438 const int klass_ref_index = cp->klass_ref_index_at(index); 439 const int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 440 check_property(valid_klass_reference_at(klass_ref_index), 441 "Invalid constant pool index %u in class file %s", 442 klass_ref_index, CHECK); 443 check_property(valid_cp_range(name_and_type_ref_index, length) && 444 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 445 "Invalid constant pool index %u in class file %s", 446 name_and_type_ref_index, CHECK); 447 break; 448 } 449 case JVM_CONSTANT_String: { 450 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 451 break; 452 } 453 case JVM_CONSTANT_Integer: 454 break; 455 case JVM_CONSTANT_Float: 456 break; 457 case JVM_CONSTANT_Long: 458 case JVM_CONSTANT_Double: { 459 index++; 460 check_property( 461 (index < length && cp->tag_at(index).is_invalid()), 462 "Improper constant pool long/double index %u in class file %s", 463 index, CHECK); 464 break; 465 } 466 case JVM_CONSTANT_NameAndType: { 467 if (!_need_verify) break; 468 const int name_ref_index = cp->name_ref_index_at(index); 469 const int signature_ref_index = cp->signature_ref_index_at(index); 470 check_property(valid_symbol_at(name_ref_index), 471 "Invalid constant pool index %u in class file %s", 472 name_ref_index, CHECK); 473 check_property(valid_symbol_at(signature_ref_index), 474 "Invalid constant pool index %u in class file %s", 475 signature_ref_index, CHECK); 476 break; 477 } 478 case JVM_CONSTANT_Utf8: 479 break; 480 case JVM_CONSTANT_UnresolvedClass: // fall-through 481 case JVM_CONSTANT_UnresolvedClassInError: { 482 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 483 break; 484 } 485 case JVM_CONSTANT_ClassIndex: { 486 const int class_index = cp->klass_index_at(index); 487 check_property(valid_symbol_at(class_index), 488 "Invalid constant pool index %u in class file %s", 489 class_index, CHECK); 490 cp->unresolved_klass_at_put(index, class_index, num_klasses++); 491 break; 492 } 493 case JVM_CONSTANT_StringIndex: { 494 const int string_index = cp->string_index_at(index); 495 check_property(valid_symbol_at(string_index), 496 "Invalid constant pool index %u in class file %s", 497 string_index, CHECK); 498 Symbol* const sym = cp->symbol_at(string_index); 499 cp->unresolved_string_at_put(index, sym); 500 break; 501 } 502 case JVM_CONSTANT_MethodHandle: { 503 const int ref_index = cp->method_handle_index_at(index); 504 check_property(valid_cp_range(ref_index, length), 505 "Invalid constant pool index %u in class file %s", 506 ref_index, CHECK); 507 const constantTag tag = cp->tag_at(ref_index); 508 const int ref_kind = cp->method_handle_ref_kind_at(index); 509 510 switch (ref_kind) { 511 case JVM_REF_getField: 512 case JVM_REF_getStatic: 513 case JVM_REF_putField: 514 case JVM_REF_putStatic: { 515 check_property( 516 tag.is_field(), 517 "Invalid constant pool index %u in class file %s (not a field)", 518 ref_index, CHECK); 519 break; 520 } 521 case JVM_REF_invokeVirtual: 522 case JVM_REF_newInvokeSpecial: { 523 check_property( 524 tag.is_method(), 525 "Invalid constant pool index %u in class file %s (not a method)", 526 ref_index, CHECK); 527 break; 528 } 529 case JVM_REF_invokeStatic: 530 case JVM_REF_invokeSpecial: { 531 check_property( 532 tag.is_method() || 533 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 534 "Invalid constant pool index %u in class file %s (not a method)", 535 ref_index, CHECK); 536 break; 537 } 538 case JVM_REF_invokeInterface: { 539 check_property( 540 tag.is_interface_method(), 541 "Invalid constant pool index %u in class file %s (not an interface method)", 542 ref_index, CHECK); 543 break; 544 } 545 default: { 546 classfile_parse_error( 547 "Bad method handle kind at constant pool index %u in class file %s", 548 index, CHECK); 549 } 550 } // switch(refkind) 551 // Keep the ref_index unchanged. It will be indirected at link-time. 552 break; 553 } // case MethodHandle 554 case JVM_CONSTANT_MethodType: { 555 const int ref_index = cp->method_type_index_at(index); 556 check_property(valid_symbol_at(ref_index), 557 "Invalid constant pool index %u in class file %s", 558 ref_index, CHECK); 559 break; 560 } 561 case JVM_CONSTANT_Dynamic: { 562 const int name_and_type_ref_index = 563 cp->invoke_dynamic_name_and_type_ref_index_at(index); 564 565 check_property(valid_cp_range(name_and_type_ref_index, length) && 566 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 567 "Invalid constant pool index %u in class file %s", 568 name_and_type_ref_index, CHECK); 569 // bootstrap specifier index must be checked later, 570 // when BootstrapMethods attr is available 571 572 // Mark the constant pool as having a CONSTANT_Dynamic_info structure 573 cp->set_has_dynamic_constant(); 574 break; 575 } 576 case JVM_CONSTANT_InvokeDynamic: { 577 const int name_and_type_ref_index = 578 cp->invoke_dynamic_name_and_type_ref_index_at(index); 579 580 check_property(valid_cp_range(name_and_type_ref_index, length) && 581 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 582 "Invalid constant pool index %u in class file %s", 583 name_and_type_ref_index, CHECK); 584 // bootstrap specifier index must be checked later, 585 // when BootstrapMethods attr is available 586 break; 587 } 588 default: { 589 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 590 ShouldNotReachHere(); 591 break; 592 } 593 } // switch(tag) 594 } // end of for 595 596 _first_patched_klass_resolved_index = num_klasses; 597 cp->allocate_resolved_klasses(_loader_data, num_klasses + _max_num_patched_klasses, CHECK); 598 599 if (_cp_patches != NULL) { 600 // need to treat this_class specially... 601 602 // Add dummy utf8 entries in the space reserved for names of patched classes. We'll use "*" 603 // for now. These will be replaced with actual names of the patched classes in patch_class(). 604 Symbol* s = vmSymbols::star_name(); 605 for (int n=_orig_cp_size; n<cp->length(); n++) { 606 cp->symbol_at_put(n, s); 607 } 608 609 int this_class_index; 610 { 611 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 612 const u1* const mark = stream->current(); 613 stream->skip_u2_fast(1); // skip flags 614 this_class_index = stream->get_u2_fast(); 615 stream->set_current(mark); // revert to mark 616 } 617 618 for (index = 1; index < length; index++) { // Index 0 is unused 619 if (has_cp_patch_at(index)) { 620 guarantee_property(index != this_class_index, 621 "Illegal constant pool patch to self at %d in class file %s", 622 index, CHECK); 623 patch_constant_pool(cp, index, cp_patch_at(index), CHECK); 624 } 625 } 626 } 627 628 if (!_need_verify) { 629 return; 630 } 631 632 // second verification pass - checks the strings are of the right format. 633 // but not yet to the other entries 634 for (index = 1; index < length; index++) { 635 const jbyte tag = cp->tag_at(index).value(); 636 switch (tag) { 637 case JVM_CONSTANT_UnresolvedClass: { 638 const Symbol* const class_name = cp->klass_name_at(index); 639 // check the name, even if _cp_patches will overwrite it 640 verify_legal_class_name(class_name, CHECK); 641 break; 642 } 643 case JVM_CONSTANT_NameAndType: { 644 if (_need_verify) { 645 const int sig_index = cp->signature_ref_index_at(index); 646 const int name_index = cp->name_ref_index_at(index); 647 const Symbol* const name = cp->symbol_at(name_index); 648 const Symbol* const sig = cp->symbol_at(sig_index); 649 guarantee_property(sig->utf8_length() != 0, 650 "Illegal zero length constant pool entry at %d in class %s", 651 sig_index, CHECK); 652 guarantee_property(name->utf8_length() != 0, 653 "Illegal zero length constant pool entry at %d in class %s", 654 name_index, CHECK); 655 656 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 657 // Format check method name and signature 658 verify_legal_method_name(name, CHECK); 659 verify_legal_method_signature(name, sig, CHECK); 660 } else { 661 // Format check field name and signature 662 verify_legal_field_name(name, CHECK); 663 verify_legal_field_signature(name, sig, CHECK); 664 } 665 } 666 break; 667 } 668 case JVM_CONSTANT_Dynamic: { 669 const int name_and_type_ref_index = 670 cp->name_and_type_ref_index_at(index); 671 // already verified to be utf8 672 const int name_ref_index = 673 cp->name_ref_index_at(name_and_type_ref_index); 674 // already verified to be utf8 675 const int signature_ref_index = 676 cp->signature_ref_index_at(name_and_type_ref_index); 677 const Symbol* const name = cp->symbol_at(name_ref_index); 678 const Symbol* const signature = cp->symbol_at(signature_ref_index); 679 if (_need_verify) { 680 // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. 681 // Need only to be sure signature is non-zero length and the right type. 682 if (signature->utf8_length() == 0 || 683 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 684 throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); 685 } 686 } 687 break; 688 } 689 case JVM_CONSTANT_InvokeDynamic: 690 case JVM_CONSTANT_Fieldref: 691 case JVM_CONSTANT_Methodref: 692 case JVM_CONSTANT_InterfaceMethodref: { 693 const int name_and_type_ref_index = 694 cp->name_and_type_ref_index_at(index); 695 // already verified to be utf8 696 const int name_ref_index = 697 cp->name_ref_index_at(name_and_type_ref_index); 698 // already verified to be utf8 699 const int signature_ref_index = 700 cp->signature_ref_index_at(name_and_type_ref_index); 701 const Symbol* const name = cp->symbol_at(name_ref_index); 702 const Symbol* const signature = cp->symbol_at(signature_ref_index); 703 if (tag == JVM_CONSTANT_Fieldref) { 704 if (_need_verify) { 705 // Field name and signature are verified above, when iterating NameAndType_info. 706 // Need only to be sure signature is non-zero length and the right type. 707 if (signature->utf8_length() == 0 || 708 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 709 throwIllegalSignature("Field", name, signature, CHECK); 710 } 711 } 712 } else { 713 if (_need_verify) { 714 // Method name and signature are verified above, when iterating NameAndType_info. 715 // Need only to be sure signature is non-zero length and the right type. 716 if (signature->utf8_length() == 0 || 717 signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 718 throwIllegalSignature("Method", name, signature, CHECK); 719 } 720 } 721 // 4509014: If a class method name begins with '<', it must be "<init>" 722 const unsigned int name_len = name->utf8_length(); 723 if (tag == JVM_CONSTANT_Methodref && 724 name_len != 0 && 725 name->byte_at(0) == '<' && 726 name != vmSymbols::object_initializer_name()) { 727 classfile_parse_error( 728 "Bad method name at constant pool index %u in class file %s", 729 name_ref_index, CHECK); 730 } 731 } 732 break; 733 } 734 case JVM_CONSTANT_MethodHandle: { 735 const int ref_index = cp->method_handle_index_at(index); 736 const int ref_kind = cp->method_handle_ref_kind_at(index); 737 switch (ref_kind) { 738 case JVM_REF_invokeVirtual: 739 case JVM_REF_invokeStatic: 740 case JVM_REF_invokeSpecial: 741 case JVM_REF_newInvokeSpecial: { 742 const int name_and_type_ref_index = 743 cp->name_and_type_ref_index_at(ref_index); 744 const int name_ref_index = 745 cp->name_ref_index_at(name_and_type_ref_index); 746 const Symbol* const name = cp->symbol_at(name_ref_index); 747 if (ref_kind == JVM_REF_newInvokeSpecial) { 748 if (name != vmSymbols::object_initializer_name()) { 749 classfile_parse_error( 750 "Bad constructor name at constant pool index %u in class file %s", 751 name_ref_index, CHECK); 752 } 753 } else { 754 if (name == vmSymbols::object_initializer_name()) { 755 classfile_parse_error( 756 "Bad method name at constant pool index %u in class file %s", 757 name_ref_index, CHECK); 758 } 759 } 760 break; 761 } 762 // Other ref_kinds are already fully checked in previous pass. 763 } // switch(ref_kind) 764 break; 765 } 766 case JVM_CONSTANT_MethodType: { 767 const Symbol* const no_name = vmSymbols::type_name(); // place holder 768 const Symbol* const signature = cp->method_type_signature_at(index); 769 verify_legal_method_signature(no_name, signature, CHECK); 770 break; 771 } 772 case JVM_CONSTANT_Utf8: { 773 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 774 } 775 } // switch(tag) 776 } // end of for 777 } 778 779 Handle ClassFileParser::clear_cp_patch_at(int index) { 780 Handle patch = cp_patch_at(index); 781 _cp_patches->at_put(index, Handle()); 782 assert(!has_cp_patch_at(index), ""); 783 return patch; 784 } 785 786 void ClassFileParser::patch_class(ConstantPool* cp, int class_index, Klass* k, Symbol* name) { 787 int name_index = _orig_cp_size + _num_patched_klasses; 788 int resolved_klass_index = _first_patched_klass_resolved_index + _num_patched_klasses; 789 790 cp->klass_at_put(class_index, name_index, resolved_klass_index, k, name); 791 _num_patched_klasses ++; 792 } 793 794 void ClassFileParser::patch_constant_pool(ConstantPool* cp, 795 int index, 796 Handle patch, 797 TRAPS) { 798 assert(cp != NULL, "invariant"); 799 800 BasicType patch_type = T_VOID; 801 802 switch (cp->tag_at(index).value()) { 803 804 case JVM_CONSTANT_UnresolvedClass: { 805 // Patching a class means pre-resolving it. 806 // The name in the constant pool is ignored. 807 if (java_lang_Class::is_instance(patch())) { 808 guarantee_property(!java_lang_Class::is_primitive(patch()), 809 "Illegal class patch at %d in class file %s", 810 index, CHECK); 811 Klass* k = java_lang_Class::as_Klass(patch()); 812 patch_class(cp, index, k, k->name()); 813 } else { 814 guarantee_property(java_lang_String::is_instance(patch()), 815 "Illegal class patch at %d in class file %s", 816 index, CHECK); 817 Symbol* const name = java_lang_String::as_symbol(patch(), CHECK); 818 patch_class(cp, index, NULL, name); 819 } 820 break; 821 } 822 823 case JVM_CONSTANT_String: { 824 // skip this patch and don't clear it. Needs the oop array for resolved 825 // references to be created first. 826 return; 827 } 828 case JVM_CONSTANT_Integer: patch_type = T_INT; goto patch_prim; 829 case JVM_CONSTANT_Float: patch_type = T_FLOAT; goto patch_prim; 830 case JVM_CONSTANT_Long: patch_type = T_LONG; goto patch_prim; 831 case JVM_CONSTANT_Double: patch_type = T_DOUBLE; goto patch_prim; 832 patch_prim: 833 { 834 jvalue value; 835 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 836 guarantee_property(value_type == patch_type, 837 "Illegal primitive patch at %d in class file %s", 838 index, CHECK); 839 switch (value_type) { 840 case T_INT: cp->int_at_put(index, value.i); break; 841 case T_FLOAT: cp->float_at_put(index, value.f); break; 842 case T_LONG: cp->long_at_put(index, value.j); break; 843 case T_DOUBLE: cp->double_at_put(index, value.d); break; 844 default: assert(false, ""); 845 } 846 } // end patch_prim label 847 break; 848 849 default: { 850 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 851 guarantee_property(!has_cp_patch_at(index), 852 "Illegal unexpected patch at %d in class file %s", 853 index, CHECK); 854 return; 855 } 856 } // end of switch(tag) 857 858 // On fall-through, mark the patch as used. 859 clear_cp_patch_at(index); 860 } 861 class NameSigHash: public ResourceObj { 862 public: 863 const Symbol* _name; // name 864 const Symbol* _sig; // signature 865 NameSigHash* _next; // Next entry in hash table 866 }; 867 868 static const int HASH_ROW_SIZE = 256; 869 870 static unsigned int hash(const Symbol* name, const Symbol* sig) { 871 unsigned int raw_hash = 0; 872 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 873 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 874 875 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 876 } 877 878 879 static void initialize_hashtable(NameSigHash** table) { 880 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 881 } 882 // Return false if the name/sig combination is found in table. 883 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 884 // The old format checker uses heap sort to find duplicates. 885 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 886 // of table since we don't expect Symbol*'s to move. 887 static bool put_after_lookup(const Symbol* name, const Symbol* sig, NameSigHash** table) { 888 assert(name != NULL, "name in constant pool is NULL"); 889 890 // First lookup for duplicates 891 int index = hash(name, sig); 892 NameSigHash* entry = table[index]; 893 while (entry != NULL) { 894 if (entry->_name == name && entry->_sig == sig) { 895 return false; 896 } 897 entry = entry->_next; 898 } 899 900 // No duplicate is found, allocate a new entry and fill it. 901 entry = new NameSigHash(); 902 entry->_name = name; 903 entry->_sig = sig; 904 905 // Insert into hash table 906 entry->_next = table[index]; 907 table[index] = entry; 908 909 return true; 910 } 911 912 // Side-effects: populates the _local_interfaces field 913 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, 914 const int itfs_len, 915 ConstantPool* const cp, 916 bool* const has_nonstatic_concrete_methods, 917 TRAPS) { 918 assert(stream != NULL, "invariant"); 919 assert(cp != NULL, "invariant"); 920 assert(has_nonstatic_concrete_methods != NULL, "invariant"); 921 922 if (itfs_len == 0) { 923 _local_interfaces = Universe::the_empty_klass_array(); 924 } else { 925 assert(itfs_len > 0, "only called for len>0"); 926 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, itfs_len, NULL, CHECK); 927 928 int index; 929 for (index = 0; index < itfs_len; index++) { 930 const u2 interface_index = stream->get_u2(CHECK); 931 Klass* interf; 932 check_property( 933 valid_klass_reference_at(interface_index), 934 "Interface name has bad constant pool index %u in class file %s", 935 interface_index, CHECK); 936 if (cp->tag_at(interface_index).is_klass()) { 937 interf = cp->resolved_klass_at(interface_index); 938 } else { 939 Symbol* const unresolved_klass = cp->klass_name_at(interface_index); 940 941 // Don't need to check legal name because it's checked when parsing constant pool. 942 // But need to make sure it's not an array type. 943 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 944 "Bad interface name in class file %s", CHECK); 945 946 // Call resolve_super so classcircularity is checked 947 interf = SystemDictionary::resolve_super_or_fail( 948 _class_name, 949 unresolved_klass, 950 Handle(THREAD, _loader_data->class_loader()), 951 _protection_domain, 952 false, 953 CHECK); 954 } 955 956 if (!interf->is_interface()) { 957 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), 958 err_msg("Class %s can not implement %s, because it is not an interface", 959 _class_name->as_klass_external_name(), 960 interf->class_loader_and_module_name())); 961 } 962 963 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { 964 *has_nonstatic_concrete_methods = true; 965 } 966 _local_interfaces->at_put(index, interf); 967 } 968 969 if (!_need_verify || itfs_len <= 1) { 970 return; 971 } 972 973 // Check if there's any duplicates in interfaces 974 ResourceMark rm(THREAD); 975 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 976 NameSigHash*, 977 HASH_ROW_SIZE); 978 initialize_hashtable(interface_names); 979 bool dup = false; 980 const Symbol* name = NULL; 981 { 982 debug_only(NoSafepointVerifier nsv;) 983 for (index = 0; index < itfs_len; index++) { 984 const Klass* const k = _local_interfaces->at(index); 985 name = InstanceKlass::cast(k)->name(); 986 // If no duplicates, add (name, NULL) in hashtable interface_names. 987 if (!put_after_lookup(name, NULL, interface_names)) { 988 dup = true; 989 break; 990 } 991 } 992 } 993 if (dup) { 994 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 995 name->as_C_string(), CHECK); 996 } 997 } 998 } 999 1000 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, 1001 int constantvalue_index, 1002 int signature_index, 1003 TRAPS) const { 1004 // Make sure the constant pool entry is of a type appropriate to this field 1005 guarantee_property( 1006 (constantvalue_index > 0 && 1007 constantvalue_index < cp->length()), 1008 "Bad initial value index %u in ConstantValue attribute in class file %s", 1009 constantvalue_index, CHECK); 1010 1011 const constantTag value_type = cp->tag_at(constantvalue_index); 1012 switch(cp->basic_type_for_signature_at(signature_index)) { 1013 case T_LONG: { 1014 guarantee_property(value_type.is_long(), 1015 "Inconsistent constant value type in class file %s", 1016 CHECK); 1017 break; 1018 } 1019 case T_FLOAT: { 1020 guarantee_property(value_type.is_float(), 1021 "Inconsistent constant value type in class file %s", 1022 CHECK); 1023 break; 1024 } 1025 case T_DOUBLE: { 1026 guarantee_property(value_type.is_double(), 1027 "Inconsistent constant value type in class file %s", 1028 CHECK); 1029 break; 1030 } 1031 case T_BYTE: 1032 case T_CHAR: 1033 case T_SHORT: 1034 case T_BOOLEAN: 1035 case T_INT: { 1036 guarantee_property(value_type.is_int(), 1037 "Inconsistent constant value type in class file %s", 1038 CHECK); 1039 break; 1040 } 1041 case T_OBJECT: { 1042 guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 1043 && value_type.is_string()), 1044 "Bad string initial value in class file %s", 1045 CHECK); 1046 break; 1047 } 1048 default: { 1049 classfile_parse_error("Unable to set initial value %u in class file %s", 1050 constantvalue_index, 1051 CHECK); 1052 } 1053 } 1054 } 1055 1056 class AnnotationCollector : public ResourceObj{ 1057 public: 1058 enum Location { _in_field, _in_method, _in_class }; 1059 enum ID { 1060 _unknown = 0, 1061 _method_CallerSensitive, 1062 _method_ForceInline, 1063 _method_DontInline, 1064 _method_InjectedProfile, 1065 _method_LambdaForm_Compiled, 1066 _method_LambdaForm_Hidden, 1067 _method_HotSpotIntrinsicCandidate, 1068 _jdk_internal_vm_annotation_Contended, 1069 _field_Stable, 1070 _jdk_internal_vm_annotation_ReservedStackAccess, 1071 _annotation_LIMIT 1072 }; 1073 const Location _location; 1074 int _annotations_present; 1075 u2 _contended_group; 1076 1077 AnnotationCollector(Location location) 1078 : _location(location), _annotations_present(0) 1079 { 1080 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); 1081 } 1082 // If this annotation name has an ID, report it (or _none). 1083 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name); 1084 // Set the annotation name: 1085 void set_annotation(ID id) { 1086 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1087 _annotations_present |= nth_bit((int)id); 1088 } 1089 1090 void remove_annotation(ID id) { 1091 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); 1092 _annotations_present &= ~nth_bit((int)id); 1093 } 1094 1095 // Report if the annotation is present. 1096 bool has_any_annotations() const { return _annotations_present != 0; } 1097 bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } 1098 1099 void set_contended_group(u2 group) { _contended_group = group; } 1100 u2 contended_group() const { return _contended_group; } 1101 1102 bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } 1103 1104 void set_stable(bool stable) { set_annotation(_field_Stable); } 1105 bool is_stable() const { return has_annotation(_field_Stable); } 1106 }; 1107 1108 // This class also doubles as a holder for metadata cleanup. 1109 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { 1110 private: 1111 ClassLoaderData* _loader_data; 1112 AnnotationArray* _field_annotations; 1113 AnnotationArray* _field_type_annotations; 1114 public: 1115 FieldAnnotationCollector(ClassLoaderData* loader_data) : 1116 AnnotationCollector(_in_field), 1117 _loader_data(loader_data), 1118 _field_annotations(NULL), 1119 _field_type_annotations(NULL) {} 1120 ~FieldAnnotationCollector(); 1121 void apply_to(FieldInfo* f); 1122 AnnotationArray* field_annotations() { return _field_annotations; } 1123 AnnotationArray* field_type_annotations() { return _field_type_annotations; } 1124 1125 void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } 1126 void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } 1127 }; 1128 1129 class MethodAnnotationCollector : public AnnotationCollector{ 1130 public: 1131 MethodAnnotationCollector() : AnnotationCollector(_in_method) { } 1132 void apply_to(const methodHandle& m); 1133 }; 1134 1135 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ 1136 public: 1137 ClassAnnotationCollector() : AnnotationCollector(_in_class) { } 1138 void apply_to(InstanceKlass* ik); 1139 }; 1140 1141 1142 static int skip_annotation_value(const u1*, int, int); // fwd decl 1143 1144 // Safely increment index by val if does not pass limit 1145 #define SAFE_ADD(index, limit, val) \ 1146 if (index >= limit - val) return limit; \ 1147 index += val; 1148 1149 // Skip an annotation. Return >=limit if there is any problem. 1150 static int skip_annotation(const u1* buffer, int limit, int index) { 1151 assert(buffer != NULL, "invariant"); 1152 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1153 // value := switch (tag:u1) { ... } 1154 SAFE_ADD(index, limit, 4); // skip atype and read nmem 1155 int nmem = Bytes::get_Java_u2((address)buffer + index - 2); 1156 while (--nmem >= 0 && index < limit) { 1157 SAFE_ADD(index, limit, 2); // skip member 1158 index = skip_annotation_value(buffer, limit, index); 1159 } 1160 return index; 1161 } 1162 1163 // Skip an annotation value. Return >=limit if there is any problem. 1164 static int skip_annotation_value(const u1* buffer, int limit, int index) { 1165 assert(buffer != NULL, "invariant"); 1166 1167 // value := switch (tag:u1) { 1168 // case B, C, I, S, Z, D, F, J, c: con:u2; 1169 // case e: e_class:u2 e_name:u2; 1170 // case s: s_con:u2; 1171 // case [: do(nval:u2) {value}; 1172 // case @: annotation; 1173 // case s: s_con:u2; 1174 // } 1175 SAFE_ADD(index, limit, 1); // read tag 1176 const u1 tag = buffer[index - 1]; 1177 switch (tag) { 1178 case 'B': 1179 case 'C': 1180 case 'I': 1181 case 'S': 1182 case 'Z': 1183 case 'D': 1184 case 'F': 1185 case 'J': 1186 case 'c': 1187 case 's': 1188 SAFE_ADD(index, limit, 2); // skip con or s_con 1189 break; 1190 case 'e': 1191 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1192 break; 1193 case '[': 1194 { 1195 SAFE_ADD(index, limit, 2); // read nval 1196 int nval = Bytes::get_Java_u2((address)buffer + index - 2); 1197 while (--nval >= 0 && index < limit) { 1198 index = skip_annotation_value(buffer, limit, index); 1199 } 1200 } 1201 break; 1202 case '@': 1203 index = skip_annotation(buffer, limit, index); 1204 break; 1205 default: 1206 return limit; // bad tag byte 1207 } 1208 return index; 1209 } 1210 1211 // Sift through annotations, looking for those significant to the VM: 1212 static void parse_annotations(const ConstantPool* const cp, 1213 const u1* buffer, int limit, 1214 AnnotationCollector* coll, 1215 ClassLoaderData* loader_data, 1216 TRAPS) { 1217 1218 assert(cp != NULL, "invariant"); 1219 assert(buffer != NULL, "invariant"); 1220 assert(coll != NULL, "invariant"); 1221 assert(loader_data != NULL, "invariant"); 1222 1223 // annotations := do(nann:u2) {annotation} 1224 int index = 2; // read nann 1225 if (index >= limit) return; 1226 int nann = Bytes::get_Java_u2((address)buffer + index - 2); 1227 enum { // initial annotation layout 1228 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1229 count_off = 2, // u2 such as 1 (one value) 1230 member_off = 4, // utf8 such as 'value' 1231 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1232 e_tag_val = 'e', 1233 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1234 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1235 e_size = 11, // end of 'e' annotation 1236 c_tag_val = 'c', // payload is type 1237 c_con_off = 7, // utf8 payload, such as 'I' 1238 c_size = 9, // end of 'c' annotation 1239 s_tag_val = 's', // payload is String 1240 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1241 s_size = 9, 1242 min_size = 6 // smallest possible size (zero members) 1243 }; 1244 // Cannot add min_size to index in case of overflow MAX_INT 1245 while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { 1246 int index0 = index; 1247 index = skip_annotation(buffer, limit, index); 1248 const u1* const abase = buffer + index0; 1249 const int atype = Bytes::get_Java_u2((address)abase + atype_off); 1250 const int count = Bytes::get_Java_u2((address)abase + count_off); 1251 const Symbol* const aname = check_symbol_at(cp, atype); 1252 if (aname == NULL) break; // invalid annotation name 1253 const Symbol* member = NULL; 1254 if (count >= 1) { 1255 const int member_index = Bytes::get_Java_u2((address)abase + member_off); 1256 member = check_symbol_at(cp, member_index); 1257 if (member == NULL) break; // invalid member name 1258 } 1259 1260 // Here is where parsing particular annotations will take place. 1261 AnnotationCollector::ID id = coll->annotation_index(loader_data, aname); 1262 if (AnnotationCollector::_unknown == id) continue; 1263 coll->set_annotation(id); 1264 1265 if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { 1266 // @Contended can optionally specify the contention group. 1267 // 1268 // Contended group defines the equivalence class over the fields: 1269 // the fields within the same contended group are not treated distinct. 1270 // The only exception is default group, which does not incur the 1271 // equivalence. Naturally, contention group for classes is meaningless. 1272 // 1273 // While the contention group is specified as String, annotation 1274 // values are already interned, and we might as well use the constant 1275 // pool index as the group tag. 1276 // 1277 u2 group_index = 0; // default contended group 1278 if (count == 1 1279 && s_size == (index - index0) // match size 1280 && s_tag_val == *(abase + tag_off) 1281 && member == vmSymbols::value_name()) { 1282 group_index = Bytes::get_Java_u2((address)abase + s_con_off); 1283 if (cp->symbol_at(group_index)->utf8_length() == 0) { 1284 group_index = 0; // default contended group 1285 } 1286 } 1287 coll->set_contended_group(group_index); 1288 } 1289 } 1290 } 1291 1292 1293 // Parse attributes for a field. 1294 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, 1295 u2 attributes_count, 1296 bool is_static, u2 signature_index, 1297 u2* const constantvalue_index_addr, 1298 bool* const is_synthetic_addr, 1299 u2* const generic_signature_index_addr, 1300 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 1301 TRAPS) { 1302 assert(cfs != NULL, "invariant"); 1303 assert(constantvalue_index_addr != NULL, "invariant"); 1304 assert(is_synthetic_addr != NULL, "invariant"); 1305 assert(generic_signature_index_addr != NULL, "invariant"); 1306 assert(parsed_annotations != NULL, "invariant"); 1307 assert(attributes_count > 0, "attributes_count should be greater than 0"); 1308 1309 u2 constantvalue_index = 0; 1310 u2 generic_signature_index = 0; 1311 bool is_synthetic = false; 1312 const u1* runtime_visible_annotations = NULL; 1313 int runtime_visible_annotations_length = 0; 1314 const u1* runtime_invisible_annotations = NULL; 1315 int runtime_invisible_annotations_length = 0; 1316 const u1* runtime_visible_type_annotations = NULL; 1317 int runtime_visible_type_annotations_length = 0; 1318 const u1* runtime_invisible_type_annotations = NULL; 1319 int runtime_invisible_type_annotations_length = 0; 1320 bool runtime_invisible_annotations_exists = false; 1321 bool runtime_invisible_type_annotations_exists = false; 1322 const ConstantPool* const cp = _cp; 1323 1324 while (attributes_count--) { 1325 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 1326 const u2 attribute_name_index = cfs->get_u2_fast(); 1327 const u4 attribute_length = cfs->get_u4_fast(); 1328 check_property(valid_symbol_at(attribute_name_index), 1329 "Invalid field attribute index %u in class file %s", 1330 attribute_name_index, 1331 CHECK); 1332 1333 const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); 1334 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 1335 // ignore if non-static 1336 if (constantvalue_index != 0) { 1337 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 1338 } 1339 check_property( 1340 attribute_length == 2, 1341 "Invalid ConstantValue field attribute length %u in class file %s", 1342 attribute_length, CHECK); 1343 1344 constantvalue_index = cfs->get_u2(CHECK); 1345 if (_need_verify) { 1346 verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); 1347 } 1348 } else if (attribute_name == vmSymbols::tag_synthetic()) { 1349 if (attribute_length != 0) { 1350 classfile_parse_error( 1351 "Invalid Synthetic field attribute length %u in class file %s", 1352 attribute_length, CHECK); 1353 } 1354 is_synthetic = true; 1355 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 1356 if (attribute_length != 0) { 1357 classfile_parse_error( 1358 "Invalid Deprecated field attribute length %u in class file %s", 1359 attribute_length, CHECK); 1360 } 1361 } else if (_major_version >= JAVA_1_5_VERSION) { 1362 if (attribute_name == vmSymbols::tag_signature()) { 1363 if (generic_signature_index != 0) { 1364 classfile_parse_error( 1365 "Multiple Signature attributes for field in class file %s", CHECK); 1366 } 1367 if (attribute_length != 2) { 1368 classfile_parse_error( 1369 "Wrong size %u for field's Signature attribute in class file %s", 1370 attribute_length, CHECK); 1371 } 1372 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); 1373 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 1374 if (runtime_visible_annotations != NULL) { 1375 classfile_parse_error( 1376 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 1377 } 1378 runtime_visible_annotations_length = attribute_length; 1379 runtime_visible_annotations = cfs->current(); 1380 assert(runtime_visible_annotations != NULL, "null visible annotations"); 1381 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 1382 parse_annotations(cp, 1383 runtime_visible_annotations, 1384 runtime_visible_annotations_length, 1385 parsed_annotations, 1386 _loader_data, 1387 CHECK); 1388 cfs->skip_u1_fast(runtime_visible_annotations_length); 1389 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 1390 if (runtime_invisible_annotations_exists) { 1391 classfile_parse_error( 1392 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 1393 } 1394 runtime_invisible_annotations_exists = true; 1395 if (PreserveAllAnnotations) { 1396 runtime_invisible_annotations_length = attribute_length; 1397 runtime_invisible_annotations = cfs->current(); 1398 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 1399 } 1400 cfs->skip_u1(attribute_length, CHECK); 1401 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 1402 if (runtime_visible_type_annotations != NULL) { 1403 classfile_parse_error( 1404 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 1405 } 1406 runtime_visible_type_annotations_length = attribute_length; 1407 runtime_visible_type_annotations = cfs->current(); 1408 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 1409 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 1410 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 1411 if (runtime_invisible_type_annotations_exists) { 1412 classfile_parse_error( 1413 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 1414 } else { 1415 runtime_invisible_type_annotations_exists = true; 1416 } 1417 if (PreserveAllAnnotations) { 1418 runtime_invisible_type_annotations_length = attribute_length; 1419 runtime_invisible_type_annotations = cfs->current(); 1420 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 1421 } 1422 cfs->skip_u1(attribute_length, CHECK); 1423 } else { 1424 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1425 } 1426 } else { 1427 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 1428 } 1429 } 1430 1431 *constantvalue_index_addr = constantvalue_index; 1432 *is_synthetic_addr = is_synthetic; 1433 *generic_signature_index_addr = generic_signature_index; 1434 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1435 runtime_visible_annotations_length, 1436 runtime_invisible_annotations, 1437 runtime_invisible_annotations_length, 1438 CHECK); 1439 parsed_annotations->set_field_annotations(a); 1440 a = assemble_annotations(runtime_visible_type_annotations, 1441 runtime_visible_type_annotations_length, 1442 runtime_invisible_type_annotations, 1443 runtime_invisible_type_annotations_length, 1444 CHECK); 1445 parsed_annotations->set_field_type_annotations(a); 1446 return; 1447 } 1448 1449 1450 // Field allocation types. Used for computing field offsets. 1451 1452 enum FieldAllocationType { 1453 STATIC_OOP, // Oops 1454 STATIC_BYTE, // Boolean, Byte, char 1455 STATIC_SHORT, // shorts 1456 STATIC_WORD, // ints 1457 STATIC_DOUBLE, // aligned long or double 1458 NONSTATIC_OOP, 1459 NONSTATIC_BYTE, 1460 NONSTATIC_SHORT, 1461 NONSTATIC_WORD, 1462 NONSTATIC_DOUBLE, 1463 MAX_FIELD_ALLOCATION_TYPE, 1464 BAD_ALLOCATION_TYPE = -1 1465 }; 1466 1467 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1468 BAD_ALLOCATION_TYPE, // 0 1469 BAD_ALLOCATION_TYPE, // 1 1470 BAD_ALLOCATION_TYPE, // 2 1471 BAD_ALLOCATION_TYPE, // 3 1472 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1473 NONSTATIC_SHORT, // T_CHAR = 5, 1474 NONSTATIC_WORD, // T_FLOAT = 6, 1475 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1476 NONSTATIC_BYTE, // T_BYTE = 8, 1477 NONSTATIC_SHORT, // T_SHORT = 9, 1478 NONSTATIC_WORD, // T_INT = 10, 1479 NONSTATIC_DOUBLE, // T_LONG = 11, 1480 NONSTATIC_OOP, // T_OBJECT = 12, 1481 NONSTATIC_OOP, // T_ARRAY = 13, 1482 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1483 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1484 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1485 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1486 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1487 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1488 BAD_ALLOCATION_TYPE, // 0 1489 BAD_ALLOCATION_TYPE, // 1 1490 BAD_ALLOCATION_TYPE, // 2 1491 BAD_ALLOCATION_TYPE, // 3 1492 STATIC_BYTE , // T_BOOLEAN = 4, 1493 STATIC_SHORT, // T_CHAR = 5, 1494 STATIC_WORD, // T_FLOAT = 6, 1495 STATIC_DOUBLE, // T_DOUBLE = 7, 1496 STATIC_BYTE, // T_BYTE = 8, 1497 STATIC_SHORT, // T_SHORT = 9, 1498 STATIC_WORD, // T_INT = 10, 1499 STATIC_DOUBLE, // T_LONG = 11, 1500 STATIC_OOP, // T_OBJECT = 12, 1501 STATIC_OOP, // T_ARRAY = 13, 1502 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1503 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1504 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1505 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1506 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1507 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1508 }; 1509 1510 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1511 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1512 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1513 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1514 return result; 1515 } 1516 1517 class ClassFileParser::FieldAllocationCount : public ResourceObj { 1518 public: 1519 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1520 1521 FieldAllocationCount() { 1522 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1523 count[i] = 0; 1524 } 1525 } 1526 1527 FieldAllocationType update(bool is_static, BasicType type) { 1528 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1529 if (atype != BAD_ALLOCATION_TYPE) { 1530 // Make sure there is no overflow with injected fields. 1531 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1532 count[atype]++; 1533 } 1534 return atype; 1535 } 1536 }; 1537 1538 // Side-effects: populates the _fields, _fields_annotations, 1539 // _fields_type_annotations fields 1540 void ClassFileParser::parse_fields(const ClassFileStream* const cfs, 1541 bool is_interface, 1542 FieldAllocationCount* const fac, 1543 ConstantPool* cp, 1544 const int cp_size, 1545 u2* const java_fields_count_ptr, 1546 TRAPS) { 1547 1548 assert(cfs != NULL, "invariant"); 1549 assert(fac != NULL, "invariant"); 1550 assert(cp != NULL, "invariant"); 1551 assert(java_fields_count_ptr != NULL, "invariant"); 1552 1553 assert(NULL == _fields, "invariant"); 1554 assert(NULL == _fields_annotations, "invariant"); 1555 assert(NULL == _fields_type_annotations, "invariant"); 1556 1557 cfs->guarantee_more(2, CHECK); // length 1558 const u2 length = cfs->get_u2_fast(); 1559 *java_fields_count_ptr = length; 1560 1561 int num_injected = 0; 1562 const InjectedField* const injected = JavaClasses::get_injected(_class_name, 1563 &num_injected); 1564 const int total_fields = length + num_injected; 1565 1566 // The field array starts with tuples of shorts 1567 // [access, name index, sig index, initial value index, byte offset]. 1568 // A generic signature slot only exists for field with generic 1569 // signature attribute. And the access flag is set with 1570 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1571 // signature slots are at the end of the field array and after all 1572 // other fields data. 1573 // 1574 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1575 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1576 // ... 1577 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1578 // [generic signature index] 1579 // [generic signature index] 1580 // ... 1581 // 1582 // Allocate a temporary resource array for field data. For each field, 1583 // a slot is reserved in the temporary array for the generic signature 1584 // index. After parsing all fields, the data are copied to a permanent 1585 // array and any unused slots will be discarded. 1586 ResourceMark rm(THREAD); 1587 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, 1588 u2, 1589 total_fields * (FieldInfo::field_slots + 1)); 1590 1591 // The generic signature slots start after all other fields' data. 1592 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1593 int num_generic_signature = 0; 1594 for (int n = 0; n < length; n++) { 1595 // access_flags, name_index, descriptor_index, attributes_count 1596 cfs->guarantee_more(8, CHECK); 1597 1598 AccessFlags access_flags; 1599 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1600 verify_legal_field_modifiers(flags, is_interface, CHECK); 1601 access_flags.set_flags(flags); 1602 1603 const u2 name_index = cfs->get_u2_fast(); 1604 check_property(valid_symbol_at(name_index), 1605 "Invalid constant pool index %u for field name in class file %s", 1606 name_index, CHECK); 1607 const Symbol* const name = cp->symbol_at(name_index); 1608 verify_legal_field_name(name, CHECK); 1609 1610 const u2 signature_index = cfs->get_u2_fast(); 1611 check_property(valid_symbol_at(signature_index), 1612 "Invalid constant pool index %u for field signature in class file %s", 1613 signature_index, CHECK); 1614 const Symbol* const sig = cp->symbol_at(signature_index); 1615 verify_legal_field_signature(name, sig, CHECK); 1616 1617 u2 constantvalue_index = 0; 1618 bool is_synthetic = false; 1619 u2 generic_signature_index = 0; 1620 const bool is_static = access_flags.is_static(); 1621 FieldAnnotationCollector parsed_annotations(_loader_data); 1622 1623 const u2 attributes_count = cfs->get_u2_fast(); 1624 if (attributes_count > 0) { 1625 parse_field_attributes(cfs, 1626 attributes_count, 1627 is_static, 1628 signature_index, 1629 &constantvalue_index, 1630 &is_synthetic, 1631 &generic_signature_index, 1632 &parsed_annotations, 1633 CHECK); 1634 1635 if (parsed_annotations.field_annotations() != NULL) { 1636 if (_fields_annotations == NULL) { 1637 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1638 _loader_data, length, NULL, 1639 CHECK); 1640 } 1641 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1642 parsed_annotations.set_field_annotations(NULL); 1643 } 1644 if (parsed_annotations.field_type_annotations() != NULL) { 1645 if (_fields_type_annotations == NULL) { 1646 _fields_type_annotations = 1647 MetadataFactory::new_array<AnnotationArray*>(_loader_data, 1648 length, 1649 NULL, 1650 CHECK); 1651 } 1652 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1653 parsed_annotations.set_field_type_annotations(NULL); 1654 } 1655 1656 if (is_synthetic) { 1657 access_flags.set_is_synthetic(); 1658 } 1659 if (generic_signature_index != 0) { 1660 access_flags.set_field_has_generic_signature(); 1661 fa[generic_signature_slot] = generic_signature_index; 1662 generic_signature_slot ++; 1663 num_generic_signature ++; 1664 } 1665 } 1666 1667 FieldInfo* const field = FieldInfo::from_field_array(fa, n); 1668 field->initialize(access_flags.as_short(), 1669 name_index, 1670 signature_index, 1671 constantvalue_index); 1672 const BasicType type = cp->basic_type_for_signature_at(signature_index); 1673 1674 // Remember how many oops we encountered and compute allocation type 1675 const FieldAllocationType atype = fac->update(is_static, type); 1676 field->set_allocation_type(atype); 1677 1678 // After field is initialized with type, we can augment it with aux info 1679 if (parsed_annotations.has_any_annotations()) 1680 parsed_annotations.apply_to(field); 1681 } 1682 1683 int index = length; 1684 if (num_injected != 0) { 1685 for (int n = 0; n < num_injected; n++) { 1686 // Check for duplicates 1687 if (injected[n].may_be_java) { 1688 const Symbol* const name = injected[n].name(); 1689 const Symbol* const signature = injected[n].signature(); 1690 bool duplicate = false; 1691 for (int i = 0; i < length; i++) { 1692 const FieldInfo* const f = FieldInfo::from_field_array(fa, i); 1693 if (name == cp->symbol_at(f->name_index()) && 1694 signature == cp->symbol_at(f->signature_index())) { 1695 // Symbol is desclared in Java so skip this one 1696 duplicate = true; 1697 break; 1698 } 1699 } 1700 if (duplicate) { 1701 // These will be removed from the field array at the end 1702 continue; 1703 } 1704 } 1705 1706 // Injected field 1707 FieldInfo* const field = FieldInfo::from_field_array(fa, index); 1708 field->initialize(JVM_ACC_FIELD_INTERNAL, 1709 injected[n].name_index, 1710 injected[n].signature_index, 1711 0); 1712 1713 const BasicType type = FieldType::basic_type(injected[n].signature()); 1714 1715 // Remember how many oops we encountered and compute allocation type 1716 const FieldAllocationType atype = fac->update(false, type); 1717 field->set_allocation_type(atype); 1718 index++; 1719 } 1720 } 1721 1722 assert(NULL == _fields, "invariant"); 1723 1724 _fields = 1725 MetadataFactory::new_array<u2>(_loader_data, 1726 index * FieldInfo::field_slots + num_generic_signature, 1727 CHECK); 1728 // Sometimes injected fields already exist in the Java source so 1729 // the fields array could be too long. In that case the 1730 // fields array is trimed. Also unused slots that were reserved 1731 // for generic signature indexes are discarded. 1732 { 1733 int i = 0; 1734 for (; i < index * FieldInfo::field_slots; i++) { 1735 _fields->at_put(i, fa[i]); 1736 } 1737 for (int j = total_fields * FieldInfo::field_slots; 1738 j < generic_signature_slot; j++) { 1739 _fields->at_put(i++, fa[j]); 1740 } 1741 assert(_fields->length() == i, ""); 1742 } 1743 1744 if (_need_verify && length > 1) { 1745 // Check duplicated fields 1746 ResourceMark rm(THREAD); 1747 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1748 THREAD, NameSigHash*, HASH_ROW_SIZE); 1749 initialize_hashtable(names_and_sigs); 1750 bool dup = false; 1751 const Symbol* name = NULL; 1752 const Symbol* sig = NULL; 1753 { 1754 debug_only(NoSafepointVerifier nsv;) 1755 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 1756 name = fs.name(); 1757 sig = fs.signature(); 1758 // If no duplicates, add name/signature in hashtable names_and_sigs. 1759 if (!put_after_lookup(name, sig, names_and_sigs)) { 1760 dup = true; 1761 break; 1762 } 1763 } 1764 } 1765 if (dup) { 1766 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1767 name->as_C_string(), sig->as_klass_external_name(), CHECK); 1768 } 1769 } 1770 } 1771 1772 1773 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, 1774 u4 code_length, 1775 u4 exception_table_length, 1776 TRAPS) { 1777 assert(cfs != NULL, "invariant"); 1778 1779 const unsafe_u2* const exception_table_start = cfs->current(); 1780 assert(exception_table_start != NULL, "null exception table"); 1781 1782 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, 1783 // end_pc, 1784 // handler_pc, 1785 // catch_type_index 1786 1787 // Will check legal target after parsing code array in verifier. 1788 if (_need_verify) { 1789 for (unsigned int i = 0; i < exception_table_length; i++) { 1790 const u2 start_pc = cfs->get_u2_fast(); 1791 const u2 end_pc = cfs->get_u2_fast(); 1792 const u2 handler_pc = cfs->get_u2_fast(); 1793 const u2 catch_type_index = cfs->get_u2_fast(); 1794 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1795 "Illegal exception table range in class file %s", 1796 CHECK_NULL); 1797 guarantee_property(handler_pc < code_length, 1798 "Illegal exception table handler in class file %s", 1799 CHECK_NULL); 1800 if (catch_type_index != 0) { 1801 guarantee_property(valid_klass_reference_at(catch_type_index), 1802 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1803 } 1804 } 1805 } else { 1806 cfs->skip_u2_fast(exception_table_length * 4); 1807 } 1808 return exception_table_start; 1809 } 1810 1811 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, 1812 u4 code_length, 1813 CompressedLineNumberWriteStream**const write_stream, 1814 TRAPS) { 1815 1816 const ClassFileStream* const cfs = _stream; 1817 unsigned int num_entries = cfs->get_u2(CHECK); 1818 1819 // Each entry is a u2 start_pc, and a u2 line_number 1820 const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); 1821 1822 // Verify line number attribute and table length 1823 check_property( 1824 code_attribute_length == sizeof(u2) + length_in_bytes, 1825 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1826 1827 cfs->guarantee_more(length_in_bytes, CHECK); 1828 1829 if ((*write_stream) == NULL) { 1830 if (length_in_bytes > fixed_buffer_size) { 1831 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1832 } else { 1833 (*write_stream) = new CompressedLineNumberWriteStream( 1834 _linenumbertable_buffer, fixed_buffer_size); 1835 } 1836 } 1837 1838 while (num_entries-- > 0) { 1839 const u2 bci = cfs->get_u2_fast(); // start_pc 1840 const u2 line = cfs->get_u2_fast(); // line_number 1841 guarantee_property(bci < code_length, 1842 "Invalid pc in LineNumberTable in class file %s", CHECK); 1843 (*write_stream)->write_pair(bci, line); 1844 } 1845 } 1846 1847 1848 class LVT_Hash : public AllStatic { 1849 public: 1850 1851 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1852 /* 1853 * 3-tuple start_bci/length/slot has to be unique key, 1854 * so the following comparison seems to be redundant: 1855 * && elem->name_cp_index == entry->_elem->name_cp_index 1856 */ 1857 return (e0.start_bci == e1.start_bci && 1858 e0.length == e1.length && 1859 e0.name_cp_index == e1.name_cp_index && 1860 e0.slot == e1.slot); 1861 } 1862 1863 static unsigned int hash(LocalVariableTableElement const& e0) { 1864 unsigned int raw_hash = e0.start_bci; 1865 1866 raw_hash = e0.length + raw_hash * 37; 1867 raw_hash = e0.name_cp_index + raw_hash * 37; 1868 raw_hash = e0.slot + raw_hash * 37; 1869 1870 return raw_hash; 1871 } 1872 }; 1873 1874 1875 // Class file LocalVariableTable elements. 1876 class Classfile_LVT_Element { 1877 public: 1878 u2 start_bci; 1879 u2 length; 1880 u2 name_cp_index; 1881 u2 descriptor_cp_index; 1882 u2 slot; 1883 }; 1884 1885 static void copy_lvt_element(const Classfile_LVT_Element* const src, 1886 LocalVariableTableElement* const lvt) { 1887 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1888 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1889 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1890 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1891 lvt->signature_cp_index = 0; 1892 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1893 } 1894 1895 // Function is used to parse both attributes: 1896 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1897 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, 1898 u4 code_length, 1899 u2 max_locals, 1900 u4 code_attribute_length, 1901 u2* const localvariable_table_length, 1902 bool isLVTT, 1903 TRAPS) { 1904 const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1905 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1906 const unsigned int size = 1907 (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1908 1909 const ConstantPool* const cp = _cp; 1910 1911 // Verify local variable table attribute has right length 1912 if (_need_verify) { 1913 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1914 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1915 } 1916 1917 const unsafe_u2* const localvariable_table_start = cfs->current(); 1918 assert(localvariable_table_start != NULL, "null local variable table"); 1919 if (!_need_verify) { 1920 cfs->skip_u2_fast(size); 1921 } else { 1922 cfs->guarantee_more(size * 2, CHECK_NULL); 1923 for(int i = 0; i < (*localvariable_table_length); i++) { 1924 const u2 start_pc = cfs->get_u2_fast(); 1925 const u2 length = cfs->get_u2_fast(); 1926 const u2 name_index = cfs->get_u2_fast(); 1927 const u2 descriptor_index = cfs->get_u2_fast(); 1928 const u2 index = cfs->get_u2_fast(); 1929 // Assign to a u4 to avoid overflow 1930 const u4 end_pc = (u4)start_pc + (u4)length; 1931 1932 if (start_pc >= code_length) { 1933 classfile_parse_error( 1934 "Invalid start_pc %u in %s in class file %s", 1935 start_pc, tbl_name, CHECK_NULL); 1936 } 1937 if (end_pc > code_length) { 1938 classfile_parse_error( 1939 "Invalid length %u in %s in class file %s", 1940 length, tbl_name, CHECK_NULL); 1941 } 1942 const int cp_size = cp->length(); 1943 guarantee_property(valid_symbol_at(name_index), 1944 "Name index %u in %s has bad constant type in class file %s", 1945 name_index, tbl_name, CHECK_NULL); 1946 guarantee_property(valid_symbol_at(descriptor_index), 1947 "Signature index %u in %s has bad constant type in class file %s", 1948 descriptor_index, tbl_name, CHECK_NULL); 1949 1950 const Symbol* const name = cp->symbol_at(name_index); 1951 const Symbol* const sig = cp->symbol_at(descriptor_index); 1952 verify_legal_field_name(name, CHECK_NULL); 1953 u2 extra_slot = 0; 1954 if (!isLVTT) { 1955 verify_legal_field_signature(name, sig, CHECK_NULL); 1956 1957 // 4894874: check special cases for double and long local variables 1958 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1959 sig == vmSymbols::type_signature(T_LONG)) { 1960 extra_slot = 1; 1961 } 1962 } 1963 guarantee_property((index + extra_slot) < max_locals, 1964 "Invalid index %u in %s in class file %s", 1965 index, tbl_name, CHECK_NULL); 1966 } 1967 } 1968 return localvariable_table_start; 1969 } 1970 1971 1972 void ClassFileParser::parse_type_array(u2 array_length, 1973 u4 code_length, 1974 u4* const u1_index, 1975 u4* const u2_index, 1976 u1* const u1_array, 1977 u2* const u2_array, 1978 TRAPS) { 1979 const ClassFileStream* const cfs = _stream; 1980 u2 index = 0; // index in the array with long/double occupying two slots 1981 u4 i1 = *u1_index; 1982 u4 i2 = *u2_index + 1; 1983 for(int i = 0; i < array_length; i++) { 1984 const u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1985 index++; 1986 if (tag == ITEM_Long || tag == ITEM_Double) { 1987 index++; 1988 } else if (tag == ITEM_Object) { 1989 const u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1990 guarantee_property(valid_klass_reference_at(class_index), 1991 "Bad class index %u in StackMap in class file %s", 1992 class_index, CHECK); 1993 } else if (tag == ITEM_Uninitialized) { 1994 const u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1995 guarantee_property( 1996 offset < code_length, 1997 "Bad uninitialized type offset %u in StackMap in class file %s", 1998 offset, CHECK); 1999 } else { 2000 guarantee_property( 2001 tag <= (u1)ITEM_Uninitialized, 2002 "Unknown variable type %u in StackMap in class file %s", 2003 tag, CHECK); 2004 } 2005 } 2006 u2_array[*u2_index] = index; 2007 *u1_index = i1; 2008 *u2_index = i2; 2009 } 2010 2011 static const u1* parse_stackmap_table(const ClassFileStream* const cfs, 2012 u4 code_attribute_length, 2013 bool need_verify, 2014 TRAPS) { 2015 assert(cfs != NULL, "invariant"); 2016 2017 if (0 == code_attribute_length) { 2018 return NULL; 2019 } 2020 2021 const u1* const stackmap_table_start = cfs->current(); 2022 assert(stackmap_table_start != NULL, "null stackmap table"); 2023 2024 // check code_attribute_length first 2025 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2026 2027 if (!need_verify && !DumpSharedSpaces) { 2028 return NULL; 2029 } 2030 return stackmap_table_start; 2031 } 2032 2033 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, 2034 u2* const checked_exceptions_length, 2035 u4 method_attribute_length, 2036 TRAPS) { 2037 assert(cfs != NULL, "invariant"); 2038 assert(checked_exceptions_length != NULL, "invariant"); 2039 2040 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 2041 *checked_exceptions_length = cfs->get_u2_fast(); 2042 const unsigned int size = 2043 (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 2044 const unsafe_u2* const checked_exceptions_start = cfs->current(); 2045 assert(checked_exceptions_start != NULL, "null checked exceptions"); 2046 if (!_need_verify) { 2047 cfs->skip_u2_fast(size); 2048 } else { 2049 // Verify each value in the checked exception table 2050 u2 checked_exception; 2051 const u2 len = *checked_exceptions_length; 2052 cfs->guarantee_more(2 * len, CHECK_NULL); 2053 for (int i = 0; i < len; i++) { 2054 checked_exception = cfs->get_u2_fast(); 2055 check_property( 2056 valid_klass_reference_at(checked_exception), 2057 "Exception name has bad type at constant pool %u in class file %s", 2058 checked_exception, CHECK_NULL); 2059 } 2060 } 2061 // check exceptions attribute length 2062 if (_need_verify) { 2063 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 2064 sizeof(u2) * size), 2065 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 2066 } 2067 return checked_exceptions_start; 2068 } 2069 2070 void ClassFileParser::throwIllegalSignature(const char* type, 2071 const Symbol* name, 2072 const Symbol* sig, 2073 TRAPS) const { 2074 assert(name != NULL, "invariant"); 2075 assert(sig != NULL, "invariant"); 2076 2077 ResourceMark rm(THREAD); 2078 Exceptions::fthrow(THREAD_AND_LOCATION, 2079 vmSymbols::java_lang_ClassFormatError(), 2080 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 2081 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 2082 } 2083 2084 AnnotationCollector::ID 2085 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, 2086 const Symbol* name) { 2087 const vmSymbols::SID sid = vmSymbols::find_sid(name); 2088 // Privileged code can use all annotations. Other code silently drops some. 2089 const bool privileged = loader_data->is_the_null_class_loader_data() || 2090 loader_data->is_platform_class_loader_data() || 2091 loader_data->is_anonymous(); 2092 switch (sid) { 2093 case vmSymbols::VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { 2094 if (_location != _in_method) break; // only allow for methods 2095 if (!privileged) break; // only allow in privileged code 2096 return _method_CallerSensitive; 2097 } 2098 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { 2099 if (_location != _in_method) break; // only allow for methods 2100 if (!privileged) break; // only allow in privileged code 2101 return _method_ForceInline; 2102 } 2103 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { 2104 if (_location != _in_method) break; // only allow for methods 2105 if (!privileged) break; // only allow in privileged code 2106 return _method_DontInline; 2107 } 2108 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { 2109 if (_location != _in_method) break; // only allow for methods 2110 if (!privileged) break; // only allow in privileged code 2111 return _method_InjectedProfile; 2112 } 2113 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { 2114 if (_location != _in_method) break; // only allow for methods 2115 if (!privileged) break; // only allow in privileged code 2116 return _method_LambdaForm_Compiled; 2117 } 2118 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): { 2119 if (_location != _in_method) break; // only allow for methods 2120 if (!privileged) break; // only allow in privileged code 2121 return _method_LambdaForm_Hidden; 2122 } 2123 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): { 2124 if (_location != _in_method) break; // only allow for methods 2125 if (!privileged) break; // only allow in privileged code 2126 return _method_HotSpotIntrinsicCandidate; 2127 } 2128 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { 2129 if (_location != _in_field) break; // only allow for fields 2130 if (!privileged) break; // only allow in privileged code 2131 return _field_Stable; 2132 } 2133 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { 2134 if (_location != _in_field && _location != _in_class) { 2135 break; // only allow for fields and classes 2136 } 2137 if (!EnableContended || (RestrictContended && !privileged)) { 2138 break; // honor privileges 2139 } 2140 return _jdk_internal_vm_annotation_Contended; 2141 } 2142 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { 2143 if (_location != _in_method) break; // only allow for methods 2144 if (RestrictReservedStack && !privileged) break; // honor privileges 2145 return _jdk_internal_vm_annotation_ReservedStackAccess; 2146 } 2147 default: { 2148 break; 2149 } 2150 } 2151 return AnnotationCollector::_unknown; 2152 } 2153 2154 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 2155 if (is_contended()) 2156 f->set_contended_group(contended_group()); 2157 if (is_stable()) 2158 f->set_stable(true); 2159 } 2160 2161 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 2162 // If there's an error deallocate metadata for field annotations 2163 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 2164 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 2165 } 2166 2167 void MethodAnnotationCollector::apply_to(const methodHandle& m) { 2168 if (has_annotation(_method_CallerSensitive)) 2169 m->set_caller_sensitive(true); 2170 if (has_annotation(_method_ForceInline)) 2171 m->set_force_inline(true); 2172 if (has_annotation(_method_DontInline)) 2173 m->set_dont_inline(true); 2174 if (has_annotation(_method_InjectedProfile)) 2175 m->set_has_injected_profile(true); 2176 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 2177 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 2178 if (has_annotation(_method_LambdaForm_Hidden)) 2179 m->set_hidden(true); 2180 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 2181 m->set_intrinsic_candidate(true); 2182 if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) 2183 m->set_has_reserved_stack_access(true); 2184 } 2185 2186 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { 2187 assert(ik != NULL, "invariant"); 2188 ik->set_is_contended(is_contended()); 2189 } 2190 2191 #define MAX_ARGS_SIZE 255 2192 #define MAX_CODE_SIZE 65535 2193 #define INITIAL_MAX_LVT_NUMBER 256 2194 2195 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2196 * 2197 * Rules for LVT's and LVTT's are: 2198 * - There can be any number of LVT's and LVTT's. 2199 * - If there are n LVT's, it is the same as if there was just 2200 * one LVT containing all the entries from the n LVT's. 2201 * - There may be no more than one LVT entry per local variable. 2202 * Two LVT entries are 'equal' if these fields are the same: 2203 * start_pc, length, name, slot 2204 * - There may be no more than one LVTT entry per each LVT entry. 2205 * Each LVTT entry has to match some LVT entry. 2206 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 2207 */ 2208 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, 2209 int lvt_cnt, 2210 u2* const localvariable_table_length, 2211 const unsafe_u2** const localvariable_table_start, 2212 int lvtt_cnt, 2213 u2* const localvariable_type_table_length, 2214 const unsafe_u2** const localvariable_type_table_start, 2215 TRAPS) { 2216 2217 ResourceMark rm(THREAD); 2218 2219 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 2220 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 2221 2222 LVT_HashTable* const table = new LVT_HashTable(); 2223 2224 // To fill LocalVariableTable in 2225 const Classfile_LVT_Element* cf_lvt; 2226 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 2227 2228 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 2229 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 2230 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 2231 copy_lvt_element(&cf_lvt[idx], lvt); 2232 // If no duplicates, add LVT elem in hashtable. 2233 if (table->put(*lvt, lvt) == false 2234 && _need_verify 2235 && _major_version >= JAVA_1_5_VERSION) { 2236 classfile_parse_error("Duplicated LocalVariableTable attribute " 2237 "entry for '%s' in class file %s", 2238 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 2239 CHECK); 2240 } 2241 } 2242 } 2243 2244 // To merge LocalVariableTable and LocalVariableTypeTable 2245 const Classfile_LVT_Element* cf_lvtt; 2246 LocalVariableTableElement lvtt_elem; 2247 2248 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 2249 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 2250 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 2251 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 2252 LocalVariableTableElement** entry = table->get(lvtt_elem); 2253 if (entry == NULL) { 2254 if (_need_verify) { 2255 classfile_parse_error("LVTT entry for '%s' in class file %s " 2256 "does not match any LVT entry", 2257 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2258 CHECK); 2259 } 2260 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 2261 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 2262 "entry for '%s' in class file %s", 2263 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 2264 CHECK); 2265 } else { 2266 // to add generic signatures into LocalVariableTable 2267 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 2268 } 2269 } 2270 } 2271 } 2272 2273 2274 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 2275 const u1* runtime_visible_annotations, 2276 int runtime_visible_annotations_length, 2277 const u1* runtime_invisible_annotations, 2278 int runtime_invisible_annotations_length, 2279 const u1* runtime_visible_parameter_annotations, 2280 int runtime_visible_parameter_annotations_length, 2281 const u1* runtime_invisible_parameter_annotations, 2282 int runtime_invisible_parameter_annotations_length, 2283 const u1* runtime_visible_type_annotations, 2284 int runtime_visible_type_annotations_length, 2285 const u1* runtime_invisible_type_annotations, 2286 int runtime_invisible_type_annotations_length, 2287 const u1* annotation_default, 2288 int annotation_default_length, 2289 TRAPS) { 2290 2291 AnnotationArray* a; 2292 2293 if (runtime_visible_annotations_length + 2294 runtime_invisible_annotations_length > 0) { 2295 a = assemble_annotations(runtime_visible_annotations, 2296 runtime_visible_annotations_length, 2297 runtime_invisible_annotations, 2298 runtime_invisible_annotations_length, 2299 CHECK); 2300 cm->set_method_annotations(a); 2301 } 2302 2303 if (runtime_visible_parameter_annotations_length + 2304 runtime_invisible_parameter_annotations_length > 0) { 2305 a = assemble_annotations(runtime_visible_parameter_annotations, 2306 runtime_visible_parameter_annotations_length, 2307 runtime_invisible_parameter_annotations, 2308 runtime_invisible_parameter_annotations_length, 2309 CHECK); 2310 cm->set_parameter_annotations(a); 2311 } 2312 2313 if (annotation_default_length > 0) { 2314 a = assemble_annotations(annotation_default, 2315 annotation_default_length, 2316 NULL, 2317 0, 2318 CHECK); 2319 cm->set_default_annotations(a); 2320 } 2321 2322 if (runtime_visible_type_annotations_length + 2323 runtime_invisible_type_annotations_length > 0) { 2324 a = assemble_annotations(runtime_visible_type_annotations, 2325 runtime_visible_type_annotations_length, 2326 runtime_invisible_type_annotations, 2327 runtime_invisible_type_annotations_length, 2328 CHECK); 2329 cm->set_type_annotations(a); 2330 } 2331 } 2332 2333 2334 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2335 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2336 // Method* to save footprint, so we only know the size of the resulting Method* when the 2337 // entire method attribute is parsed. 2338 // 2339 // The promoted_flags parameter is used to pass relevant access_flags 2340 // from the method back up to the containing klass. These flag values 2341 // are added to klass's access_flags. 2342 2343 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, 2344 bool is_interface, 2345 const ConstantPool* cp, 2346 AccessFlags* const promoted_flags, 2347 TRAPS) { 2348 assert(cfs != NULL, "invariant"); 2349 assert(cp != NULL, "invariant"); 2350 assert(promoted_flags != NULL, "invariant"); 2351 2352 ResourceMark rm(THREAD); 2353 // Parse fixed parts: 2354 // access_flags, name_index, descriptor_index, attributes_count 2355 cfs->guarantee_more(8, CHECK_NULL); 2356 2357 int flags = cfs->get_u2_fast(); 2358 const u2 name_index = cfs->get_u2_fast(); 2359 const int cp_size = cp->length(); 2360 check_property( 2361 valid_symbol_at(name_index), 2362 "Illegal constant pool index %u for method name in class file %s", 2363 name_index, CHECK_NULL); 2364 const Symbol* const name = cp->symbol_at(name_index); 2365 verify_legal_method_name(name, CHECK_NULL); 2366 2367 const u2 signature_index = cfs->get_u2_fast(); 2368 guarantee_property( 2369 valid_symbol_at(signature_index), 2370 "Illegal constant pool index %u for method signature in class file %s", 2371 signature_index, CHECK_NULL); 2372 const Symbol* const signature = cp->symbol_at(signature_index); 2373 2374 if (name == vmSymbols::class_initializer_name()) { 2375 // We ignore the other access flags for a valid class initializer. 2376 // (JVM Spec 2nd ed., chapter 4.6) 2377 if (_major_version < 51) { // backward compatibility 2378 flags = JVM_ACC_STATIC; 2379 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2380 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2381 } else { 2382 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_NULL); 2383 } 2384 } else { 2385 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); 2386 } 2387 2388 if (name == vmSymbols::object_initializer_name() && is_interface) { 2389 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL); 2390 } 2391 2392 int args_size = -1; // only used when _need_verify is true 2393 if (_need_verify) { 2394 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2395 verify_legal_method_signature(name, signature, CHECK_NULL); 2396 if (args_size > MAX_ARGS_SIZE) { 2397 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_NULL); 2398 } 2399 } 2400 2401 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2402 2403 // Default values for code and exceptions attribute elements 2404 u2 max_stack = 0; 2405 u2 max_locals = 0; 2406 u4 code_length = 0; 2407 const u1* code_start = 0; 2408 u2 exception_table_length = 0; 2409 const unsafe_u2* exception_table_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2410 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2411 u2 checked_exceptions_length = 0; 2412 const unsafe_u2* checked_exceptions_start = NULL; // (potentially unaligned) pointer to array of u2 elements 2413 CompressedLineNumberWriteStream* linenumber_table = NULL; 2414 int linenumber_table_length = 0; 2415 int total_lvt_length = 0; 2416 u2 lvt_cnt = 0; 2417 u2 lvtt_cnt = 0; 2418 bool lvt_allocated = false; 2419 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2420 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2421 u2* localvariable_table_length = NULL; 2422 const unsafe_u2** localvariable_table_start = NULL; // (potentially unaligned) pointer to array of LVT attributes 2423 u2* localvariable_type_table_length = NULL; 2424 const unsafe_u2** localvariable_type_table_start = NULL; // (potentially unaligned) pointer to LVTT attributes 2425 int method_parameters_length = -1; 2426 const u1* method_parameters_data = NULL; 2427 bool method_parameters_seen = false; 2428 bool parsed_code_attribute = false; 2429 bool parsed_checked_exceptions_attribute = false; 2430 bool parsed_stackmap_attribute = false; 2431 // stackmap attribute - JDK1.5 2432 const u1* stackmap_data = NULL; 2433 int stackmap_data_length = 0; 2434 u2 generic_signature_index = 0; 2435 MethodAnnotationCollector parsed_annotations; 2436 const u1* runtime_visible_annotations = NULL; 2437 int runtime_visible_annotations_length = 0; 2438 const u1* runtime_invisible_annotations = NULL; 2439 int runtime_invisible_annotations_length = 0; 2440 const u1* runtime_visible_parameter_annotations = NULL; 2441 int runtime_visible_parameter_annotations_length = 0; 2442 const u1* runtime_invisible_parameter_annotations = NULL; 2443 int runtime_invisible_parameter_annotations_length = 0; 2444 const u1* runtime_visible_type_annotations = NULL; 2445 int runtime_visible_type_annotations_length = 0; 2446 const u1* runtime_invisible_type_annotations = NULL; 2447 int runtime_invisible_type_annotations_length = 0; 2448 bool runtime_invisible_annotations_exists = false; 2449 bool runtime_invisible_type_annotations_exists = false; 2450 bool runtime_invisible_parameter_annotations_exists = false; 2451 const u1* annotation_default = NULL; 2452 int annotation_default_length = 0; 2453 2454 // Parse code and exceptions attribute 2455 u2 method_attributes_count = cfs->get_u2_fast(); 2456 while (method_attributes_count--) { 2457 cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length 2458 const u2 method_attribute_name_index = cfs->get_u2_fast(); 2459 const u4 method_attribute_length = cfs->get_u4_fast(); 2460 check_property( 2461 valid_symbol_at(method_attribute_name_index), 2462 "Invalid method attribute name index %u in class file %s", 2463 method_attribute_name_index, CHECK_NULL); 2464 2465 const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); 2466 if (method_attribute_name == vmSymbols::tag_code()) { 2467 // Parse Code attribute 2468 if (_need_verify) { 2469 guarantee_property( 2470 !access_flags.is_native() && !access_flags.is_abstract(), 2471 "Code attribute in native or abstract methods in class file %s", 2472 CHECK_NULL); 2473 } 2474 if (parsed_code_attribute) { 2475 classfile_parse_error("Multiple Code attributes in class file %s", 2476 CHECK_NULL); 2477 } 2478 parsed_code_attribute = true; 2479 2480 // Stack size, locals size, and code size 2481 if (_major_version == 45 && _minor_version <= 2) { 2482 cfs->guarantee_more(4, CHECK_NULL); 2483 max_stack = cfs->get_u1_fast(); 2484 max_locals = cfs->get_u1_fast(); 2485 code_length = cfs->get_u2_fast(); 2486 } else { 2487 cfs->guarantee_more(8, CHECK_NULL); 2488 max_stack = cfs->get_u2_fast(); 2489 max_locals = cfs->get_u2_fast(); 2490 code_length = cfs->get_u4_fast(); 2491 } 2492 if (_need_verify) { 2493 guarantee_property(args_size <= max_locals, 2494 "Arguments can't fit into locals in class file %s", 2495 CHECK_NULL); 2496 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2497 "Invalid method Code length %u in class file %s", 2498 code_length, CHECK_NULL); 2499 } 2500 // Code pointer 2501 code_start = cfs->current(); 2502 assert(code_start != NULL, "null code start"); 2503 cfs->guarantee_more(code_length, CHECK_NULL); 2504 cfs->skip_u1_fast(code_length); 2505 2506 // Exception handler table 2507 cfs->guarantee_more(2, CHECK_NULL); // exception_table_length 2508 exception_table_length = cfs->get_u2_fast(); 2509 if (exception_table_length > 0) { 2510 exception_table_start = parse_exception_table(cfs, 2511 code_length, 2512 exception_table_length, 2513 CHECK_NULL); 2514 } 2515 2516 // Parse additional attributes in code attribute 2517 cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count 2518 u2 code_attributes_count = cfs->get_u2_fast(); 2519 2520 unsigned int calculated_attribute_length = 0; 2521 2522 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2523 calculated_attribute_length = 2524 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2525 } else { 2526 // max_stack, locals and length are smaller in pre-version 45.2 classes 2527 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2528 } 2529 calculated_attribute_length += 2530 code_length + 2531 sizeof(exception_table_length) + 2532 sizeof(code_attributes_count) + 2533 exception_table_length * 2534 ( sizeof(u2) + // start_pc 2535 sizeof(u2) + // end_pc 2536 sizeof(u2) + // handler_pc 2537 sizeof(u2) ); // catch_type_index 2538 2539 while (code_attributes_count--) { 2540 cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length 2541 const u2 code_attribute_name_index = cfs->get_u2_fast(); 2542 const u4 code_attribute_length = cfs->get_u4_fast(); 2543 calculated_attribute_length += code_attribute_length + 2544 sizeof(code_attribute_name_index) + 2545 sizeof(code_attribute_length); 2546 check_property(valid_symbol_at(code_attribute_name_index), 2547 "Invalid code attribute name index %u in class file %s", 2548 code_attribute_name_index, 2549 CHECK_NULL); 2550 if (LoadLineNumberTables && 2551 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2552 // Parse and compress line number table 2553 parse_linenumber_table(code_attribute_length, 2554 code_length, 2555 &linenumber_table, 2556 CHECK_NULL); 2557 2558 } else if (LoadLocalVariableTables && 2559 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2560 // Parse local variable table 2561 if (!lvt_allocated) { 2562 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2563 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2564 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2565 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2566 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2567 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2568 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2569 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2570 lvt_allocated = true; 2571 } 2572 if (lvt_cnt == max_lvt_cnt) { 2573 max_lvt_cnt <<= 1; 2574 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2575 localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2576 } 2577 localvariable_table_start[lvt_cnt] = 2578 parse_localvariable_table(cfs, 2579 code_length, 2580 max_locals, 2581 code_attribute_length, 2582 &localvariable_table_length[lvt_cnt], 2583 false, // is not LVTT 2584 CHECK_NULL); 2585 total_lvt_length += localvariable_table_length[lvt_cnt]; 2586 lvt_cnt++; 2587 } else if (LoadLocalVariableTypeTables && 2588 _major_version >= JAVA_1_5_VERSION && 2589 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2590 if (!lvt_allocated) { 2591 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2592 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2593 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2594 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2595 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2596 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2597 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2598 THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); 2599 lvt_allocated = true; 2600 } 2601 // Parse local variable type table 2602 if (lvtt_cnt == max_lvtt_cnt) { 2603 max_lvtt_cnt <<= 1; 2604 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2605 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2606 } 2607 localvariable_type_table_start[lvtt_cnt] = 2608 parse_localvariable_table(cfs, 2609 code_length, 2610 max_locals, 2611 code_attribute_length, 2612 &localvariable_type_table_length[lvtt_cnt], 2613 true, // is LVTT 2614 CHECK_NULL); 2615 lvtt_cnt++; 2616 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2617 cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2618 // Stack map is only needed by the new verifier in JDK1.5. 2619 if (parsed_stackmap_attribute) { 2620 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_NULL); 2621 } 2622 stackmap_data = parse_stackmap_table(cfs, code_attribute_length, _need_verify, CHECK_NULL); 2623 stackmap_data_length = code_attribute_length; 2624 parsed_stackmap_attribute = true; 2625 } else { 2626 // Skip unknown attributes 2627 cfs->skip_u1(code_attribute_length, CHECK_NULL); 2628 } 2629 } 2630 // check method attribute length 2631 if (_need_verify) { 2632 guarantee_property(method_attribute_length == calculated_attribute_length, 2633 "Code segment has wrong length in class file %s", 2634 CHECK_NULL); 2635 } 2636 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2637 // Parse Exceptions attribute 2638 if (parsed_checked_exceptions_attribute) { 2639 classfile_parse_error("Multiple Exceptions attributes in class file %s", 2640 CHECK_NULL); 2641 } 2642 parsed_checked_exceptions_attribute = true; 2643 checked_exceptions_start = 2644 parse_checked_exceptions(cfs, 2645 &checked_exceptions_length, 2646 method_attribute_length, 2647 CHECK_NULL); 2648 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2649 // reject multiple method parameters 2650 if (method_parameters_seen) { 2651 classfile_parse_error("Multiple MethodParameters attributes in class file %s", 2652 CHECK_NULL); 2653 } 2654 method_parameters_seen = true; 2655 method_parameters_length = cfs->get_u1_fast(); 2656 const u2 real_length = (method_parameters_length * 4u) + 1u; 2657 if (method_attribute_length != real_length) { 2658 classfile_parse_error( 2659 "Invalid MethodParameters method attribute length %u in class file", 2660 method_attribute_length, CHECK_NULL); 2661 } 2662 method_parameters_data = cfs->current(); 2663 cfs->skip_u2_fast(method_parameters_length); 2664 cfs->skip_u2_fast(method_parameters_length); 2665 // ignore this attribute if it cannot be reflected 2666 if (!SystemDictionary::Parameter_klass_loaded()) 2667 method_parameters_length = -1; 2668 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2669 if (method_attribute_length != 0) { 2670 classfile_parse_error( 2671 "Invalid Synthetic method attribute length %u in class file %s", 2672 method_attribute_length, CHECK_NULL); 2673 } 2674 // Should we check that there hasn't already been a synthetic attribute? 2675 access_flags.set_is_synthetic(); 2676 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2677 if (method_attribute_length != 0) { 2678 classfile_parse_error( 2679 "Invalid Deprecated method attribute length %u in class file %s", 2680 method_attribute_length, CHECK_NULL); 2681 } 2682 } else if (_major_version >= JAVA_1_5_VERSION) { 2683 if (method_attribute_name == vmSymbols::tag_signature()) { 2684 if (generic_signature_index != 0) { 2685 classfile_parse_error( 2686 "Multiple Signature attributes for method in class file %s", 2687 CHECK_NULL); 2688 } 2689 if (method_attribute_length != 2) { 2690 classfile_parse_error( 2691 "Invalid Signature attribute length %u in class file %s", 2692 method_attribute_length, CHECK_NULL); 2693 } 2694 generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); 2695 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2696 if (runtime_visible_annotations != NULL) { 2697 classfile_parse_error( 2698 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", 2699 CHECK_NULL); 2700 } 2701 runtime_visible_annotations_length = method_attribute_length; 2702 runtime_visible_annotations = cfs->current(); 2703 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2704 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); 2705 parse_annotations(cp, 2706 runtime_visible_annotations, 2707 runtime_visible_annotations_length, 2708 &parsed_annotations, 2709 _loader_data, 2710 CHECK_NULL); 2711 cfs->skip_u1_fast(runtime_visible_annotations_length); 2712 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2713 if (runtime_invisible_annotations_exists) { 2714 classfile_parse_error( 2715 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", 2716 CHECK_NULL); 2717 } 2718 runtime_invisible_annotations_exists = true; 2719 if (PreserveAllAnnotations) { 2720 runtime_invisible_annotations_length = method_attribute_length; 2721 runtime_invisible_annotations = cfs->current(); 2722 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2723 } 2724 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2725 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2726 if (runtime_visible_parameter_annotations != NULL) { 2727 classfile_parse_error( 2728 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", 2729 CHECK_NULL); 2730 } 2731 runtime_visible_parameter_annotations_length = method_attribute_length; 2732 runtime_visible_parameter_annotations = cfs->current(); 2733 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2734 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); 2735 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2736 if (runtime_invisible_parameter_annotations_exists) { 2737 classfile_parse_error( 2738 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", 2739 CHECK_NULL); 2740 } 2741 runtime_invisible_parameter_annotations_exists = true; 2742 if (PreserveAllAnnotations) { 2743 runtime_invisible_parameter_annotations_length = method_attribute_length; 2744 runtime_invisible_parameter_annotations = cfs->current(); 2745 assert(runtime_invisible_parameter_annotations != NULL, 2746 "null invisible parameter annotations"); 2747 } 2748 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2749 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2750 if (annotation_default != NULL) { 2751 classfile_parse_error( 2752 "Multiple AnnotationDefault attributes for method in class file %s", 2753 CHECK_NULL); 2754 } 2755 annotation_default_length = method_attribute_length; 2756 annotation_default = cfs->current(); 2757 assert(annotation_default != NULL, "null annotation default"); 2758 cfs->skip_u1(annotation_default_length, CHECK_NULL); 2759 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2760 if (runtime_visible_type_annotations != NULL) { 2761 classfile_parse_error( 2762 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2763 CHECK_NULL); 2764 } 2765 runtime_visible_type_annotations_length = method_attribute_length; 2766 runtime_visible_type_annotations = cfs->current(); 2767 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2768 // No need for the VM to parse Type annotations 2769 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); 2770 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2771 if (runtime_invisible_type_annotations_exists) { 2772 classfile_parse_error( 2773 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2774 CHECK_NULL); 2775 } else { 2776 runtime_invisible_type_annotations_exists = true; 2777 } 2778 if (PreserveAllAnnotations) { 2779 runtime_invisible_type_annotations_length = method_attribute_length; 2780 runtime_invisible_type_annotations = cfs->current(); 2781 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2782 } 2783 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2784 } else { 2785 // Skip unknown attributes 2786 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2787 } 2788 } else { 2789 // Skip unknown attributes 2790 cfs->skip_u1(method_attribute_length, CHECK_NULL); 2791 } 2792 } 2793 2794 if (linenumber_table != NULL) { 2795 linenumber_table->write_terminator(); 2796 linenumber_table_length = linenumber_table->position(); 2797 } 2798 2799 // Make sure there's at least one Code attribute in non-native/non-abstract method 2800 if (_need_verify) { 2801 guarantee_property(access_flags.is_native() || 2802 access_flags.is_abstract() || 2803 parsed_code_attribute, 2804 "Absent Code attribute in method that is not native or abstract in class file %s", 2805 CHECK_NULL); 2806 } 2807 2808 // All sizing information for a Method* is finally available, now create it 2809 InlineTableSizes sizes( 2810 total_lvt_length, 2811 linenumber_table_length, 2812 exception_table_length, 2813 checked_exceptions_length, 2814 method_parameters_length, 2815 generic_signature_index, 2816 runtime_visible_annotations_length + 2817 runtime_invisible_annotations_length, 2818 runtime_visible_parameter_annotations_length + 2819 runtime_invisible_parameter_annotations_length, 2820 runtime_visible_type_annotations_length + 2821 runtime_invisible_type_annotations_length, 2822 annotation_default_length, 2823 0); 2824 2825 Method* const m = Method::allocate(_loader_data, 2826 code_length, 2827 access_flags, 2828 &sizes, 2829 ConstMethod::NORMAL, 2830 CHECK_NULL); 2831 2832 ClassLoadingService::add_class_method_size(m->size()*wordSize); 2833 2834 // Fill in information from fixed part (access_flags already set) 2835 m->set_constants(_cp); 2836 m->set_name_index(name_index); 2837 m->set_signature_index(signature_index); 2838 2839 ResultTypeFinder rtf(cp->symbol_at(signature_index)); 2840 m->constMethod()->set_result_type(rtf.type()); 2841 2842 if (args_size >= 0) { 2843 m->set_size_of_parameters(args_size); 2844 } else { 2845 m->compute_size_of_parameters(THREAD); 2846 } 2847 #ifdef ASSERT 2848 if (args_size >= 0) { 2849 m->compute_size_of_parameters(THREAD); 2850 assert(args_size == m->size_of_parameters(), ""); 2851 } 2852 #endif 2853 2854 // Fill in code attribute information 2855 m->set_max_stack(max_stack); 2856 m->set_max_locals(max_locals); 2857 if (stackmap_data != NULL) { 2858 m->constMethod()->copy_stackmap_data(_loader_data, 2859 (u1*)stackmap_data, 2860 stackmap_data_length, 2861 CHECK_NULL); 2862 } 2863 2864 // Copy byte codes 2865 m->set_code((u1*)code_start); 2866 2867 // Copy line number table 2868 if (linenumber_table != NULL) { 2869 memcpy(m->compressed_linenumber_table(), 2870 linenumber_table->buffer(), 2871 linenumber_table_length); 2872 } 2873 2874 // Copy exception table 2875 if (exception_table_length > 0) { 2876 Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start, 2877 m->exception_table_start(), 2878 exception_table_length * sizeof(ExceptionTableElement), 2879 sizeof(u2)); 2880 } 2881 2882 // Copy method parameters 2883 if (method_parameters_length > 0) { 2884 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2885 for (int i = 0; i < method_parameters_length; i++) { 2886 elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); 2887 method_parameters_data += 2; 2888 elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); 2889 method_parameters_data += 2; 2890 } 2891 } 2892 2893 // Copy checked exceptions 2894 if (checked_exceptions_length > 0) { 2895 Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start, 2896 m->checked_exceptions_start(), 2897 checked_exceptions_length * sizeof(CheckedExceptionElement), 2898 sizeof(u2)); 2899 } 2900 2901 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2902 if (total_lvt_length > 0) { 2903 promoted_flags->set_has_localvariable_table(); 2904 copy_localvariable_table(m->constMethod(), 2905 lvt_cnt, 2906 localvariable_table_length, 2907 localvariable_table_start, 2908 lvtt_cnt, 2909 localvariable_type_table_length, 2910 localvariable_type_table_start, 2911 CHECK_NULL); 2912 } 2913 2914 if (parsed_annotations.has_any_annotations()) 2915 parsed_annotations.apply_to(m); 2916 2917 // Copy annotations 2918 copy_method_annotations(m->constMethod(), 2919 runtime_visible_annotations, 2920 runtime_visible_annotations_length, 2921 runtime_invisible_annotations, 2922 runtime_invisible_annotations_length, 2923 runtime_visible_parameter_annotations, 2924 runtime_visible_parameter_annotations_length, 2925 runtime_invisible_parameter_annotations, 2926 runtime_invisible_parameter_annotations_length, 2927 runtime_visible_type_annotations, 2928 runtime_visible_type_annotations_length, 2929 runtime_invisible_type_annotations, 2930 runtime_invisible_type_annotations_length, 2931 annotation_default, 2932 annotation_default_length, 2933 CHECK_NULL); 2934 2935 if (name == vmSymbols::finalize_method_name() && 2936 signature == vmSymbols::void_method_signature()) { 2937 if (m->is_empty_method()) { 2938 _has_empty_finalizer = true; 2939 } else { 2940 _has_finalizer = true; 2941 } 2942 } 2943 if (name == vmSymbols::object_initializer_name() && 2944 signature == vmSymbols::void_method_signature() && 2945 m->is_vanilla_constructor()) { 2946 _has_vanilla_constructor = true; 2947 } 2948 2949 NOT_PRODUCT(m->verify()); 2950 return m; 2951 } 2952 2953 2954 // The promoted_flags parameter is used to pass relevant access_flags 2955 // from the methods back up to the containing klass. These flag values 2956 // are added to klass's access_flags. 2957 // Side-effects: populates the _methods field in the parser 2958 void ClassFileParser::parse_methods(const ClassFileStream* const cfs, 2959 bool is_interface, 2960 AccessFlags* promoted_flags, 2961 bool* has_final_method, 2962 bool* declares_nonstatic_concrete_methods, 2963 TRAPS) { 2964 assert(cfs != NULL, "invariant"); 2965 assert(promoted_flags != NULL, "invariant"); 2966 assert(has_final_method != NULL, "invariant"); 2967 assert(declares_nonstatic_concrete_methods != NULL, "invariant"); 2968 2969 assert(NULL == _methods, "invariant"); 2970 2971 cfs->guarantee_more(2, CHECK); // length 2972 const u2 length = cfs->get_u2_fast(); 2973 if (length == 0) { 2974 _methods = Universe::the_empty_method_array(); 2975 } else { 2976 _methods = MetadataFactory::new_array<Method*>(_loader_data, 2977 length, 2978 NULL, 2979 CHECK); 2980 2981 for (int index = 0; index < length; index++) { 2982 Method* method = parse_method(cfs, 2983 is_interface, 2984 _cp, 2985 promoted_flags, 2986 CHECK); 2987 2988 if (method->is_final()) { 2989 *has_final_method = true; 2990 } 2991 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags 2992 // used for interface initialization, and default method inheritance analysis 2993 if (is_interface && !(*declares_nonstatic_concrete_methods) 2994 && !method->is_abstract() && !method->is_static()) { 2995 *declares_nonstatic_concrete_methods = true; 2996 } 2997 _methods->at_put(index, method); 2998 } 2999 3000 if (_need_verify && length > 1) { 3001 // Check duplicated methods 3002 ResourceMark rm(THREAD); 3003 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 3004 THREAD, NameSigHash*, HASH_ROW_SIZE); 3005 initialize_hashtable(names_and_sigs); 3006 bool dup = false; 3007 const Symbol* name = NULL; 3008 const Symbol* sig = NULL; 3009 { 3010 debug_only(NoSafepointVerifier nsv;) 3011 for (int i = 0; i < length; i++) { 3012 const Method* const m = _methods->at(i); 3013 name = m->name(); 3014 sig = m->signature(); 3015 // If no duplicates, add name/signature in hashtable names_and_sigs. 3016 if (!put_after_lookup(name, sig, names_and_sigs)) { 3017 dup = true; 3018 break; 3019 } 3020 } 3021 } 3022 if (dup) { 3023 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 3024 name->as_C_string(), sig->as_klass_external_name(), CHECK); 3025 } 3026 } 3027 } 3028 } 3029 3030 static const intArray* sort_methods(Array<Method*>* methods) { 3031 const int length = methods->length(); 3032 // If JVMTI original method ordering or sharing is enabled we have to 3033 // remember the original class file ordering. 3034 // We temporarily use the vtable_index field in the Method* to store the 3035 // class file index, so we can read in after calling qsort. 3036 // Put the method ordering in the shared archive. 3037 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3038 for (int index = 0; index < length; index++) { 3039 Method* const m = methods->at(index); 3040 assert(!m->valid_vtable_index(), "vtable index should not be set"); 3041 m->set_vtable_index(index); 3042 } 3043 } 3044 // Sort method array by ascending method name (for faster lookups & vtable construction) 3045 // Note that the ordering is not alphabetical, see Symbol::fast_compare 3046 Method::sort_methods(methods); 3047 3048 intArray* method_ordering = NULL; 3049 // If JVMTI original method ordering or sharing is enabled construct int 3050 // array remembering the original ordering 3051 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 3052 method_ordering = new intArray(length, length, -1); 3053 for (int index = 0; index < length; index++) { 3054 Method* const m = methods->at(index); 3055 const int old_index = m->vtable_index(); 3056 assert(old_index >= 0 && old_index < length, "invalid method index"); 3057 method_ordering->at_put(index, old_index); 3058 m->set_vtable_index(Method::invalid_vtable_index); 3059 } 3060 } 3061 return method_ordering; 3062 } 3063 3064 // Parse generic_signature attribute for methods and fields 3065 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, 3066 TRAPS) { 3067 assert(cfs != NULL, "invariant"); 3068 3069 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 3070 const u2 generic_signature_index = cfs->get_u2_fast(); 3071 check_property( 3072 valid_symbol_at(generic_signature_index), 3073 "Invalid Signature attribute at constant pool index %u in class file %s", 3074 generic_signature_index, CHECK_0); 3075 return generic_signature_index; 3076 } 3077 3078 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, 3079 TRAPS) { 3080 3081 assert(cfs != NULL, "invariant"); 3082 3083 cfs->guarantee_more(2, CHECK); // sourcefile_index 3084 const u2 sourcefile_index = cfs->get_u2_fast(); 3085 check_property( 3086 valid_symbol_at(sourcefile_index), 3087 "Invalid SourceFile attribute at constant pool index %u in class file %s", 3088 sourcefile_index, CHECK); 3089 set_class_sourcefile_index(sourcefile_index); 3090 } 3091 3092 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, 3093 int length, 3094 TRAPS) { 3095 assert(cfs != NULL, "invariant"); 3096 3097 const u1* const sde_buffer = cfs->current(); 3098 assert(sde_buffer != NULL, "null sde buffer"); 3099 3100 // Don't bother storing it if there is no way to retrieve it 3101 if (JvmtiExport::can_get_source_debug_extension()) { 3102 assert((length+1) > length, "Overflow checking"); 3103 u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 3104 for (int i = 0; i < length; i++) { 3105 sde[i] = sde_buffer[i]; 3106 } 3107 sde[length] = '\0'; 3108 set_class_sde_buffer((const char*)sde, length); 3109 } 3110 // Got utf8 string, set stream position forward 3111 cfs->skip_u1(length, CHECK); 3112 } 3113 3114 3115 // Inner classes can be static, private or protected (classic VM does this) 3116 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ 3117 JVM_ACC_PRIVATE | \ 3118 JVM_ACC_PROTECTED | \ 3119 JVM_ACC_STATIC \ 3120 ) 3121 3122 // Return number of classes in the inner classes attribute table 3123 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, 3124 const u1* const inner_classes_attribute_start, 3125 bool parsed_enclosingmethod_attribute, 3126 u2 enclosing_method_class_index, 3127 u2 enclosing_method_method_index, 3128 TRAPS) { 3129 const u1* const current_mark = cfs->current(); 3130 u2 length = 0; 3131 if (inner_classes_attribute_start != NULL) { 3132 cfs->set_current(inner_classes_attribute_start); 3133 cfs->guarantee_more(2, CHECK_0); // length 3134 length = cfs->get_u2_fast(); 3135 } 3136 3137 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 3138 // method data: 3139 // [inner_class_info_index, 3140 // outer_class_info_index, 3141 // inner_name_index, 3142 // inner_class_access_flags, 3143 // ... 3144 // enclosing_method_class_index, 3145 // enclosing_method_method_index] 3146 const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 3147 Array<u2>* const inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 3148 _inner_classes = inner_classes; 3149 3150 int index = 0; 3151 const int cp_size = _cp->length(); 3152 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 3153 for (int n = 0; n < length; n++) { 3154 // Inner class index 3155 const u2 inner_class_info_index = cfs->get_u2_fast(); 3156 check_property( 3157 valid_klass_reference_at(inner_class_info_index), 3158 "inner_class_info_index %u has bad constant type in class file %s", 3159 inner_class_info_index, CHECK_0); 3160 // Outer class index 3161 const u2 outer_class_info_index = cfs->get_u2_fast(); 3162 check_property( 3163 outer_class_info_index == 0 || 3164 valid_klass_reference_at(outer_class_info_index), 3165 "outer_class_info_index %u has bad constant type in class file %s", 3166 outer_class_info_index, CHECK_0); 3167 // Inner class name 3168 const u2 inner_name_index = cfs->get_u2_fast(); 3169 check_property( 3170 inner_name_index == 0 || valid_symbol_at(inner_name_index), 3171 "inner_name_index %u has bad constant type in class file %s", 3172 inner_name_index, CHECK_0); 3173 if (_need_verify) { 3174 guarantee_property(inner_class_info_index != outer_class_info_index, 3175 "Class is both outer and inner class in class file %s", CHECK_0); 3176 } 3177 // Access flags 3178 jint flags; 3179 // JVM_ACC_MODULE is defined in JDK-9 and later. 3180 if (_major_version >= JAVA_9_VERSION) { 3181 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); 3182 } else { 3183 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 3184 } 3185 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3186 // Set abstract bit for old class files for backward compatibility 3187 flags |= JVM_ACC_ABSTRACT; 3188 } 3189 verify_legal_class_modifiers(flags, CHECK_0); 3190 AccessFlags inner_access_flags(flags); 3191 3192 inner_classes->at_put(index++, inner_class_info_index); 3193 inner_classes->at_put(index++, outer_class_info_index); 3194 inner_classes->at_put(index++, inner_name_index); 3195 inner_classes->at_put(index++, inner_access_flags.as_short()); 3196 } 3197 3198 // 4347400: make sure there's no duplicate entry in the classes array 3199 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 3200 for(int i = 0; i < length * 4; i += 4) { 3201 for(int j = i + 4; j < length * 4; j += 4) { 3202 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 3203 inner_classes->at(i+1) != inner_classes->at(j+1) || 3204 inner_classes->at(i+2) != inner_classes->at(j+2) || 3205 inner_classes->at(i+3) != inner_classes->at(j+3)), 3206 "Duplicate entry in InnerClasses in class file %s", 3207 CHECK_0); 3208 } 3209 } 3210 } 3211 3212 // Set EnclosingMethod class and method indexes. 3213 if (parsed_enclosingmethod_attribute) { 3214 inner_classes->at_put(index++, enclosing_method_class_index); 3215 inner_classes->at_put(index++, enclosing_method_method_index); 3216 } 3217 assert(index == size, "wrong size"); 3218 3219 // Restore buffer's current position. 3220 cfs->set_current(current_mark); 3221 3222 return length; 3223 } 3224 3225 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 3226 set_class_synthetic_flag(true); 3227 } 3228 3229 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { 3230 assert(cfs != NULL, "invariant"); 3231 3232 const u2 signature_index = cfs->get_u2(CHECK); 3233 check_property( 3234 valid_symbol_at(signature_index), 3235 "Invalid constant pool index %u in Signature attribute in class file %s", 3236 signature_index, CHECK); 3237 set_class_generic_signature_index(signature_index); 3238 } 3239 3240 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, 3241 ConstantPool* cp, 3242 u4 attribute_byte_length, 3243 TRAPS) { 3244 assert(cfs != NULL, "invariant"); 3245 assert(cp != NULL, "invariant"); 3246 3247 const u1* const current_start = cfs->current(); 3248 3249 guarantee_property(attribute_byte_length >= sizeof(u2), 3250 "Invalid BootstrapMethods attribute length %u in class file %s", 3251 attribute_byte_length, 3252 CHECK); 3253 3254 cfs->guarantee_more(attribute_byte_length, CHECK); 3255 3256 const int attribute_array_length = cfs->get_u2_fast(); 3257 3258 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 3259 "Short length on BootstrapMethods in class file %s", 3260 CHECK); 3261 3262 3263 // The attribute contains a counted array of counted tuples of shorts, 3264 // represending bootstrap specifiers: 3265 // length*{bootstrap_method_index, argument_count*{argument_index}} 3266 const int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 3267 // operand_count = number of shorts in attr, except for leading length 3268 3269 // The attribute is copied into a short[] array. 3270 // The array begins with a series of short[2] pairs, one for each tuple. 3271 const int index_size = (attribute_array_length * 2); 3272 3273 Array<u2>* const operands = 3274 MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 3275 3276 // Eagerly assign operands so they will be deallocated with the constant 3277 // pool if there is an error. 3278 cp->set_operands(operands); 3279 3280 int operand_fill_index = index_size; 3281 const int cp_size = cp->length(); 3282 3283 for (int n = 0; n < attribute_array_length; n++) { 3284 // Store a 32-bit offset into the header of the operand array. 3285 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 3286 3287 // Read a bootstrap specifier. 3288 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 3289 const u2 bootstrap_method_index = cfs->get_u2_fast(); 3290 const u2 argument_count = cfs->get_u2_fast(); 3291 check_property( 3292 valid_cp_range(bootstrap_method_index, cp_size) && 3293 cp->tag_at(bootstrap_method_index).is_method_handle(), 3294 "bootstrap_method_index %u has bad constant type in class file %s", 3295 bootstrap_method_index, 3296 CHECK); 3297 3298 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 3299 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 3300 CHECK); 3301 3302 operands->at_put(operand_fill_index++, bootstrap_method_index); 3303 operands->at_put(operand_fill_index++, argument_count); 3304 3305 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 3306 for (int j = 0; j < argument_count; j++) { 3307 const u2 argument_index = cfs->get_u2_fast(); 3308 check_property( 3309 valid_cp_range(argument_index, cp_size) && 3310 cp->tag_at(argument_index).is_loadable_constant(), 3311 "argument_index %u has bad constant type in class file %s", 3312 argument_index, 3313 CHECK); 3314 operands->at_put(operand_fill_index++, argument_index); 3315 } 3316 } 3317 guarantee_property(current_start + attribute_byte_length == cfs->current(), 3318 "Bad length on BootstrapMethods in class file %s", 3319 CHECK); 3320 } 3321 3322 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, 3323 ConstantPool* cp, 3324 ClassFileParser::ClassAnnotationCollector* parsed_annotations, 3325 TRAPS) { 3326 assert(cfs != NULL, "invariant"); 3327 assert(cp != NULL, "invariant"); 3328 assert(parsed_annotations != NULL, "invariant"); 3329 3330 // Set inner classes attribute to default sentinel 3331 _inner_classes = Universe::the_empty_short_array(); 3332 cfs->guarantee_more(2, CHECK); // attributes_count 3333 u2 attributes_count = cfs->get_u2_fast(); 3334 bool parsed_sourcefile_attribute = false; 3335 bool parsed_innerclasses_attribute = false; 3336 bool parsed_enclosingmethod_attribute = false; 3337 bool parsed_bootstrap_methods_attribute = false; 3338 const u1* runtime_visible_annotations = NULL; 3339 int runtime_visible_annotations_length = 0; 3340 const u1* runtime_invisible_annotations = NULL; 3341 int runtime_invisible_annotations_length = 0; 3342 const u1* runtime_visible_type_annotations = NULL; 3343 int runtime_visible_type_annotations_length = 0; 3344 const u1* runtime_invisible_type_annotations = NULL; 3345 int runtime_invisible_type_annotations_length = 0; 3346 bool runtime_invisible_type_annotations_exists = false; 3347 bool runtime_invisible_annotations_exists = false; 3348 bool parsed_source_debug_ext_annotations_exist = false; 3349 const u1* inner_classes_attribute_start = NULL; 3350 u4 inner_classes_attribute_length = 0; 3351 u2 enclosing_method_class_index = 0; 3352 u2 enclosing_method_method_index = 0; 3353 // Iterate over attributes 3354 while (attributes_count--) { 3355 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 3356 const u2 attribute_name_index = cfs->get_u2_fast(); 3357 const u4 attribute_length = cfs->get_u4_fast(); 3358 check_property( 3359 valid_symbol_at(attribute_name_index), 3360 "Attribute name has bad constant pool index %u in class file %s", 3361 attribute_name_index, CHECK); 3362 const Symbol* const tag = cp->symbol_at(attribute_name_index); 3363 if (tag == vmSymbols::tag_source_file()) { 3364 // Check for SourceFile tag 3365 if (_need_verify) { 3366 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 3367 } 3368 if (parsed_sourcefile_attribute) { 3369 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 3370 } else { 3371 parsed_sourcefile_attribute = true; 3372 } 3373 parse_classfile_sourcefile_attribute(cfs, CHECK); 3374 } else if (tag == vmSymbols::tag_source_debug_extension()) { 3375 // Check for SourceDebugExtension tag 3376 if (parsed_source_debug_ext_annotations_exist) { 3377 classfile_parse_error( 3378 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 3379 } 3380 parsed_source_debug_ext_annotations_exist = true; 3381 parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); 3382 } else if (tag == vmSymbols::tag_inner_classes()) { 3383 // Check for InnerClasses tag 3384 if (parsed_innerclasses_attribute) { 3385 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 3386 } else { 3387 parsed_innerclasses_attribute = true; 3388 } 3389 inner_classes_attribute_start = cfs->current(); 3390 inner_classes_attribute_length = attribute_length; 3391 cfs->skip_u1(inner_classes_attribute_length, CHECK); 3392 } else if (tag == vmSymbols::tag_synthetic()) { 3393 // Check for Synthetic tag 3394 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 3395 if (attribute_length != 0) { 3396 classfile_parse_error( 3397 "Invalid Synthetic classfile attribute length %u in class file %s", 3398 attribute_length, CHECK); 3399 } 3400 parse_classfile_synthetic_attribute(CHECK); 3401 } else if (tag == vmSymbols::tag_deprecated()) { 3402 // Check for Deprecatd tag - 4276120 3403 if (attribute_length != 0) { 3404 classfile_parse_error( 3405 "Invalid Deprecated classfile attribute length %u in class file %s", 3406 attribute_length, CHECK); 3407 } 3408 } else if (_major_version >= JAVA_1_5_VERSION) { 3409 if (tag == vmSymbols::tag_signature()) { 3410 if (_generic_signature_index != 0) { 3411 classfile_parse_error( 3412 "Multiple Signature attributes in class file %s", CHECK); 3413 } 3414 if (attribute_length != 2) { 3415 classfile_parse_error( 3416 "Wrong Signature attribute length %u in class file %s", 3417 attribute_length, CHECK); 3418 } 3419 parse_classfile_signature_attribute(cfs, CHECK); 3420 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 3421 if (runtime_visible_annotations != NULL) { 3422 classfile_parse_error( 3423 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 3424 } 3425 runtime_visible_annotations_length = attribute_length; 3426 runtime_visible_annotations = cfs->current(); 3427 assert(runtime_visible_annotations != NULL, "null visible annotations"); 3428 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 3429 parse_annotations(cp, 3430 runtime_visible_annotations, 3431 runtime_visible_annotations_length, 3432 parsed_annotations, 3433 _loader_data, 3434 CHECK); 3435 cfs->skip_u1_fast(runtime_visible_annotations_length); 3436 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 3437 if (runtime_invisible_annotations_exists) { 3438 classfile_parse_error( 3439 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 3440 } 3441 runtime_invisible_annotations_exists = true; 3442 if (PreserveAllAnnotations) { 3443 runtime_invisible_annotations_length = attribute_length; 3444 runtime_invisible_annotations = cfs->current(); 3445 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3446 } 3447 cfs->skip_u1(attribute_length, CHECK); 3448 } else if (tag == vmSymbols::tag_enclosing_method()) { 3449 if (parsed_enclosingmethod_attribute) { 3450 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3451 } else { 3452 parsed_enclosingmethod_attribute = true; 3453 } 3454 guarantee_property(attribute_length == 4, 3455 "Wrong EnclosingMethod attribute length %u in class file %s", 3456 attribute_length, CHECK); 3457 cfs->guarantee_more(4, CHECK); // class_index, method_index 3458 enclosing_method_class_index = cfs->get_u2_fast(); 3459 enclosing_method_method_index = cfs->get_u2_fast(); 3460 if (enclosing_method_class_index == 0) { 3461 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3462 } 3463 // Validate the constant pool indices and types 3464 check_property(valid_klass_reference_at(enclosing_method_class_index), 3465 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3466 if (enclosing_method_method_index != 0 && 3467 (!cp->is_within_bounds(enclosing_method_method_index) || 3468 !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3469 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3470 } 3471 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3472 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3473 if (parsed_bootstrap_methods_attribute) { 3474 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3475 } 3476 parsed_bootstrap_methods_attribute = true; 3477 parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); 3478 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3479 if (runtime_visible_type_annotations != NULL) { 3480 classfile_parse_error( 3481 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3482 } 3483 runtime_visible_type_annotations_length = attribute_length; 3484 runtime_visible_type_annotations = cfs->current(); 3485 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3486 // No need for the VM to parse Type annotations 3487 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3488 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3489 if (runtime_invisible_type_annotations_exists) { 3490 classfile_parse_error( 3491 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3492 } else { 3493 runtime_invisible_type_annotations_exists = true; 3494 } 3495 if (PreserveAllAnnotations) { 3496 runtime_invisible_type_annotations_length = attribute_length; 3497 runtime_invisible_type_annotations = cfs->current(); 3498 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3499 } 3500 cfs->skip_u1(attribute_length, CHECK); 3501 } else { 3502 // Unknown attribute 3503 cfs->skip_u1(attribute_length, CHECK); 3504 } 3505 } else { 3506 // Unknown attribute 3507 cfs->skip_u1(attribute_length, CHECK); 3508 } 3509 } 3510 _annotations = assemble_annotations(runtime_visible_annotations, 3511 runtime_visible_annotations_length, 3512 runtime_invisible_annotations, 3513 runtime_invisible_annotations_length, 3514 CHECK); 3515 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3516 runtime_visible_type_annotations_length, 3517 runtime_invisible_type_annotations, 3518 runtime_invisible_type_annotations_length, 3519 CHECK); 3520 3521 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3522 const u2 num_of_classes = parse_classfile_inner_classes_attribute( 3523 cfs, 3524 inner_classes_attribute_start, 3525 parsed_innerclasses_attribute, 3526 enclosing_method_class_index, 3527 enclosing_method_method_index, 3528 CHECK); 3529 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3530 guarantee_property( 3531 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3532 "Wrong InnerClasses attribute length in class file %s", CHECK); 3533 } 3534 } 3535 3536 if (_max_bootstrap_specifier_index >= 0) { 3537 guarantee_property(parsed_bootstrap_methods_attribute, 3538 "Missing BootstrapMethods attribute in class file %s", CHECK); 3539 } 3540 } 3541 3542 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { 3543 assert(k != NULL, "invariant"); 3544 3545 if (_synthetic_flag) 3546 k->set_is_synthetic(); 3547 if (_sourcefile_index != 0) { 3548 k->set_source_file_name_index(_sourcefile_index); 3549 } 3550 if (_generic_signature_index != 0) { 3551 k->set_generic_signature_index(_generic_signature_index); 3552 } 3553 if (_sde_buffer != NULL) { 3554 k->set_source_debug_extension(_sde_buffer, _sde_length); 3555 } 3556 } 3557 3558 // Create the Annotations object that will 3559 // hold the annotations array for the Klass. 3560 void ClassFileParser::create_combined_annotations(TRAPS) { 3561 if (_annotations == NULL && 3562 _type_annotations == NULL && 3563 _fields_annotations == NULL && 3564 _fields_type_annotations == NULL) { 3565 // Don't create the Annotations object unnecessarily. 3566 return; 3567 } 3568 3569 Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); 3570 annotations->set_class_annotations(_annotations); 3571 annotations->set_class_type_annotations(_type_annotations); 3572 annotations->set_fields_annotations(_fields_annotations); 3573 annotations->set_fields_type_annotations(_fields_type_annotations); 3574 3575 // This is the Annotations object that will be 3576 // assigned to InstanceKlass being constructed. 3577 _combined_annotations = annotations; 3578 3579 // The annotations arrays below has been transfered the 3580 // _combined_annotations so these fields can now be cleared. 3581 _annotations = NULL; 3582 _type_annotations = NULL; 3583 _fields_annotations = NULL; 3584 _fields_type_annotations = NULL; 3585 } 3586 3587 // Transfer ownership of metadata allocated to the InstanceKlass. 3588 void ClassFileParser::apply_parsed_class_metadata( 3589 InstanceKlass* this_klass, 3590 int java_fields_count, TRAPS) { 3591 assert(this_klass != NULL, "invariant"); 3592 3593 _cp->set_pool_holder(this_klass); 3594 this_klass->set_constants(_cp); 3595 this_klass->set_fields(_fields, java_fields_count); 3596 this_klass->set_methods(_methods); 3597 this_klass->set_inner_classes(_inner_classes); 3598 this_klass->set_local_interfaces(_local_interfaces); 3599 this_klass->set_annotations(_combined_annotations); 3600 // Delay the setting of _transitive_interfaces until after initialize_supers() in 3601 // fill_instance_klass(). It is because the _transitive_interfaces may be shared with 3602 // its _super. If an OOM occurs while loading the current klass, its _super field 3603 // may not have been set. When GC tries to free the klass, the _transitive_interfaces 3604 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent 3605 // dereferences to the deallocated _transitive_interfaces will result in a crash. 3606 3607 // Clear out these fields so they don't get deallocated by the destructor 3608 clear_class_metadata(); 3609 } 3610 3611 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations, 3612 int runtime_visible_annotations_length, 3613 const u1* const runtime_invisible_annotations, 3614 int runtime_invisible_annotations_length, 3615 TRAPS) { 3616 AnnotationArray* annotations = NULL; 3617 if (runtime_visible_annotations != NULL || 3618 runtime_invisible_annotations != NULL) { 3619 annotations = MetadataFactory::new_array<u1>(_loader_data, 3620 runtime_visible_annotations_length + 3621 runtime_invisible_annotations_length, 3622 CHECK_(annotations)); 3623 if (runtime_visible_annotations != NULL) { 3624 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3625 annotations->at_put(i, runtime_visible_annotations[i]); 3626 } 3627 } 3628 if (runtime_invisible_annotations != NULL) { 3629 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3630 int append = runtime_visible_annotations_length+i; 3631 annotations->at_put(append, runtime_invisible_annotations[i]); 3632 } 3633 } 3634 } 3635 return annotations; 3636 } 3637 3638 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, 3639 const int super_class_index, 3640 const bool need_verify, 3641 TRAPS) { 3642 assert(cp != NULL, "invariant"); 3643 const InstanceKlass* super_klass = NULL; 3644 3645 if (super_class_index == 0) { 3646 check_property(_class_name == vmSymbols::java_lang_Object(), 3647 "Invalid superclass index %u in class file %s", 3648 super_class_index, 3649 CHECK_NULL); 3650 } else { 3651 check_property(valid_klass_reference_at(super_class_index), 3652 "Invalid superclass index %u in class file %s", 3653 super_class_index, 3654 CHECK_NULL); 3655 // The class name should be legal because it is checked when parsing constant pool. 3656 // However, make sure it is not an array type. 3657 bool is_array = false; 3658 if (cp->tag_at(super_class_index).is_klass()) { 3659 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); 3660 if (need_verify) 3661 is_array = super_klass->is_array_klass(); 3662 } else if (need_verify) { 3663 is_array = (cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3664 } 3665 if (need_verify) { 3666 guarantee_property(!is_array, 3667 "Bad superclass name in class file %s", CHECK_NULL); 3668 } 3669 } 3670 return super_klass; 3671 } 3672 3673 static unsigned int compute_oop_map_count(const InstanceKlass* super, 3674 unsigned int nonstatic_oop_map_count, 3675 int first_nonstatic_oop_offset) { 3676 3677 unsigned int map_count = 3678 NULL == super ? 0 : super->nonstatic_oop_map_count(); 3679 if (nonstatic_oop_map_count > 0) { 3680 // We have oops to add to map 3681 if (map_count == 0) { 3682 map_count = nonstatic_oop_map_count; 3683 } 3684 else { 3685 // Check whether we should add a new map block or whether the last one can 3686 // be extended 3687 const OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 3688 const OopMapBlock* const last_map = first_map + map_count - 1; 3689 3690 const int next_offset = last_map->offset() + last_map->count() * heapOopSize; 3691 if (next_offset == first_nonstatic_oop_offset) { 3692 // There is no gap bettwen superklass's last oop field and first 3693 // local oop field, merge maps. 3694 nonstatic_oop_map_count -= 1; 3695 } 3696 else { 3697 // Superklass didn't end with a oop field, add extra maps 3698 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 3699 } 3700 map_count += nonstatic_oop_map_count; 3701 } 3702 } 3703 return map_count; 3704 } 3705 3706 #ifndef PRODUCT 3707 static void print_field_layout(const Symbol* name, 3708 Array<u2>* fields, 3709 const constantPoolHandle& cp, 3710 int instance_size, 3711 int instance_fields_start, 3712 int instance_fields_end, 3713 int static_fields_end) { 3714 3715 assert(name != NULL, "invariant"); 3716 3717 tty->print("%s: field layout\n", name->as_klass_external_name()); 3718 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 3719 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3720 if (!fs.access_flags().is_static()) { 3721 tty->print(" @%3d \"%s\" %s\n", 3722 fs.offset(), 3723 fs.name()->as_klass_external_name(), 3724 fs.signature()->as_klass_external_name()); 3725 } 3726 } 3727 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 3728 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 3729 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 3730 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 3731 if (fs.access_flags().is_static()) { 3732 tty->print(" @%3d \"%s\" %s\n", 3733 fs.offset(), 3734 fs.name()->as_klass_external_name(), 3735 fs.signature()->as_klass_external_name()); 3736 } 3737 } 3738 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 3739 tty->print("\n"); 3740 } 3741 #endif 3742 3743 // Values needed for oopmap and InstanceKlass creation 3744 class ClassFileParser::FieldLayoutInfo : public ResourceObj { 3745 public: 3746 int* nonstatic_oop_offsets; 3747 unsigned int* nonstatic_oop_counts; 3748 unsigned int nonstatic_oop_map_count; 3749 unsigned int total_oop_map_count; 3750 int instance_size; 3751 int nonstatic_field_size; 3752 int static_field_size; 3753 bool has_nonstatic_fields; 3754 }; 3755 3756 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3757 void ClassFileParser::layout_fields(ConstantPool* cp, 3758 const FieldAllocationCount* fac, 3759 const ClassAnnotationCollector* parsed_annotations, 3760 FieldLayoutInfo* info, 3761 TRAPS) { 3762 3763 assert(cp != NULL, "invariant"); 3764 3765 // Field size and offset computation 3766 int nonstatic_field_size = _super_klass == NULL ? 0 : 3767 _super_klass->nonstatic_field_size(); 3768 3769 // Count the contended fields by type. 3770 // 3771 // We ignore static fields, because @Contended is not supported for them. 3772 // The layout code below will also ignore the static fields. 3773 int nonstatic_contended_count = 0; 3774 FieldAllocationCount fac_contended; 3775 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 3776 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3777 if (fs.is_contended()) { 3778 fac_contended.count[atype]++; 3779 if (!fs.access_flags().is_static()) { 3780 nonstatic_contended_count++; 3781 } 3782 } 3783 } 3784 3785 3786 // Calculate the starting byte offsets 3787 int next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3788 int next_static_double_offset = next_static_oop_offset + 3789 ((fac->count[STATIC_OOP]) * heapOopSize); 3790 if (fac->count[STATIC_DOUBLE]) { 3791 next_static_double_offset = align_up(next_static_double_offset, BytesPerLong); 3792 } 3793 3794 int next_static_word_offset = next_static_double_offset + 3795 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3796 int next_static_short_offset = next_static_word_offset + 3797 ((fac->count[STATIC_WORD]) * BytesPerInt); 3798 int next_static_byte_offset = next_static_short_offset + 3799 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3800 3801 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3802 nonstatic_field_size * heapOopSize; 3803 3804 int next_nonstatic_field_offset = nonstatic_fields_start; 3805 3806 const bool is_contended_class = parsed_annotations->is_contended(); 3807 3808 // Class is contended, pad before all the fields 3809 if (is_contended_class) { 3810 next_nonstatic_field_offset += ContendedPaddingWidth; 3811 } 3812 3813 // Compute the non-contended fields count. 3814 // The packing code below relies on these counts to determine if some field 3815 // can be squeezed into the alignment gap. Contended fields are obviously 3816 // exempt from that. 3817 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3818 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3819 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3820 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3821 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3822 3823 // Total non-static fields count, including every contended field 3824 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3825 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3826 fac->count[NONSTATIC_OOP]; 3827 3828 const bool super_has_nonstatic_fields = 3829 (_super_klass != NULL && _super_klass->has_nonstatic_fields()); 3830 const bool has_nonstatic_fields = 3831 super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3832 3833 3834 // Prepare list of oops for oop map generation. 3835 // 3836 // "offset" and "count" lists are describing the set of contiguous oop 3837 // regions. offset[i] is the start of the i-th region, which then has 3838 // count[i] oops following. Before we know how many regions are required, 3839 // we pessimistically allocate the maps to fit all the oops into the 3840 // distinct regions. 3841 // 3842 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3843 // to figure out if we still need to do this. 3844 unsigned int nonstatic_oop_map_count = 0; 3845 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3846 3847 int* nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3848 THREAD, int, max_nonstatic_oop_maps); 3849 unsigned int* const nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3850 THREAD, unsigned int, max_nonstatic_oop_maps); 3851 3852 int first_nonstatic_oop_offset = 0; // will be set for first oop field 3853 3854 bool compact_fields = CompactFields; 3855 int allocation_style = FieldsAllocationStyle; 3856 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3857 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3858 allocation_style = 1; // Optimistic 3859 } 3860 3861 // The next classes have predefined hard-coded fields offsets 3862 // (see in JavaClasses::compute_hard_coded_offsets()). 3863 // Use default fields allocation order for them. 3864 if( (allocation_style != 0 || compact_fields ) && _loader_data->class_loader() == NULL && 3865 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3866 _class_name == vmSymbols::java_lang_Class() || 3867 _class_name == vmSymbols::java_lang_ClassLoader() || 3868 _class_name == vmSymbols::java_lang_ref_Reference() || 3869 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3870 _class_name == vmSymbols::java_lang_StackTraceElement() || 3871 _class_name == vmSymbols::java_lang_String() || 3872 _class_name == vmSymbols::java_lang_Throwable() || 3873 _class_name == vmSymbols::java_lang_Boolean() || 3874 _class_name == vmSymbols::java_lang_Character() || 3875 _class_name == vmSymbols::java_lang_Float() || 3876 _class_name == vmSymbols::java_lang_Double() || 3877 _class_name == vmSymbols::java_lang_Byte() || 3878 _class_name == vmSymbols::java_lang_Short() || 3879 _class_name == vmSymbols::java_lang_Integer() || 3880 _class_name == vmSymbols::java_lang_Long())) { 3881 allocation_style = 0; // Allocate oops first 3882 compact_fields = false; // Don't compact fields 3883 } 3884 3885 int next_nonstatic_oop_offset = 0; 3886 int next_nonstatic_double_offset = 0; 3887 3888 // Rearrange fields for a given allocation style 3889 if( allocation_style == 0 ) { 3890 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3891 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3892 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3893 (nonstatic_oop_count * heapOopSize); 3894 } else if( allocation_style == 1 ) { 3895 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3896 next_nonstatic_double_offset = next_nonstatic_field_offset; 3897 } else if( allocation_style == 2 ) { 3898 // Fields allocation: oops fields in super and sub classes are together. 3899 if( nonstatic_field_size > 0 && _super_klass != NULL && 3900 _super_klass->nonstatic_oop_map_size() > 0 ) { 3901 const unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3902 const OopMapBlock* const first_map = _super_klass->start_of_nonstatic_oop_maps(); 3903 const OopMapBlock* const last_map = first_map + map_count - 1; 3904 const int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3905 if (next_offset == next_nonstatic_field_offset) { 3906 allocation_style = 0; // allocate oops first 3907 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3908 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3909 (nonstatic_oop_count * heapOopSize); 3910 } 3911 } 3912 if( allocation_style == 2 ) { 3913 allocation_style = 1; // allocate oops last 3914 next_nonstatic_double_offset = next_nonstatic_field_offset; 3915 } 3916 } else { 3917 ShouldNotReachHere(); 3918 } 3919 3920 int nonstatic_oop_space_count = 0; 3921 int nonstatic_word_space_count = 0; 3922 int nonstatic_short_space_count = 0; 3923 int nonstatic_byte_space_count = 0; 3924 int nonstatic_oop_space_offset = 0; 3925 int nonstatic_word_space_offset = 0; 3926 int nonstatic_short_space_offset = 0; 3927 int nonstatic_byte_space_offset = 0; 3928 3929 // Try to squeeze some of the fields into the gaps due to 3930 // long/double alignment. 3931 if (nonstatic_double_count > 0) { 3932 int offset = next_nonstatic_double_offset; 3933 next_nonstatic_double_offset = align_up(offset, BytesPerLong); 3934 if (compact_fields && offset != next_nonstatic_double_offset) { 3935 // Allocate available fields into the gap before double field. 3936 int length = next_nonstatic_double_offset - offset; 3937 assert(length == BytesPerInt, ""); 3938 nonstatic_word_space_offset = offset; 3939 if (nonstatic_word_count > 0) { 3940 nonstatic_word_count -= 1; 3941 nonstatic_word_space_count = 1; // Only one will fit 3942 length -= BytesPerInt; 3943 offset += BytesPerInt; 3944 } 3945 nonstatic_short_space_offset = offset; 3946 while (length >= BytesPerShort && nonstatic_short_count > 0) { 3947 nonstatic_short_count -= 1; 3948 nonstatic_short_space_count += 1; 3949 length -= BytesPerShort; 3950 offset += BytesPerShort; 3951 } 3952 nonstatic_byte_space_offset = offset; 3953 while (length > 0 && nonstatic_byte_count > 0) { 3954 nonstatic_byte_count -= 1; 3955 nonstatic_byte_space_count += 1; 3956 length -= 1; 3957 } 3958 // Allocate oop field in the gap if there are no other fields for that. 3959 nonstatic_oop_space_offset = offset; 3960 if (length >= heapOopSize && nonstatic_oop_count > 0 && 3961 allocation_style != 0) { // when oop fields not first 3962 nonstatic_oop_count -= 1; 3963 nonstatic_oop_space_count = 1; // Only one will fit 3964 length -= heapOopSize; 3965 offset += heapOopSize; 3966 } 3967 } 3968 } 3969 3970 int next_nonstatic_word_offset = next_nonstatic_double_offset + 3971 (nonstatic_double_count * BytesPerLong); 3972 int next_nonstatic_short_offset = next_nonstatic_word_offset + 3973 (nonstatic_word_count * BytesPerInt); 3974 int next_nonstatic_byte_offset = next_nonstatic_short_offset + 3975 (nonstatic_short_count * BytesPerShort); 3976 int next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3977 nonstatic_byte_count; 3978 3979 // let oops jump before padding with this allocation style 3980 if( allocation_style == 1 ) { 3981 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3982 if( nonstatic_oop_count > 0 ) { 3983 next_nonstatic_oop_offset = align_up(next_nonstatic_oop_offset, heapOopSize); 3984 } 3985 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3986 } 3987 3988 // Iterate over fields again and compute correct offsets. 3989 // The field allocation type was temporarily stored in the offset slot. 3990 // oop fields are located before non-oop fields (static and non-static). 3991 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 3992 3993 // skip already laid out fields 3994 if (fs.is_offset_set()) continue; 3995 3996 // contended instance fields are handled below 3997 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3998 3999 int real_offset = 0; 4000 const FieldAllocationType atype = (const FieldAllocationType) fs.allocation_type(); 4001 4002 // pack the rest of the fields 4003 switch (atype) { 4004 case STATIC_OOP: 4005 real_offset = next_static_oop_offset; 4006 next_static_oop_offset += heapOopSize; 4007 break; 4008 case STATIC_BYTE: 4009 real_offset = next_static_byte_offset; 4010 next_static_byte_offset += 1; 4011 break; 4012 case STATIC_SHORT: 4013 real_offset = next_static_short_offset; 4014 next_static_short_offset += BytesPerShort; 4015 break; 4016 case STATIC_WORD: 4017 real_offset = next_static_word_offset; 4018 next_static_word_offset += BytesPerInt; 4019 break; 4020 case STATIC_DOUBLE: 4021 real_offset = next_static_double_offset; 4022 next_static_double_offset += BytesPerLong; 4023 break; 4024 case NONSTATIC_OOP: 4025 if( nonstatic_oop_space_count > 0 ) { 4026 real_offset = nonstatic_oop_space_offset; 4027 nonstatic_oop_space_offset += heapOopSize; 4028 nonstatic_oop_space_count -= 1; 4029 } else { 4030 real_offset = next_nonstatic_oop_offset; 4031 next_nonstatic_oop_offset += heapOopSize; 4032 } 4033 4034 // Record this oop in the oop maps 4035 if( nonstatic_oop_map_count > 0 && 4036 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4037 real_offset - 4038 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4039 heapOopSize ) { 4040 // This oop is adjacent to the previous one, add to current oop map 4041 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4042 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4043 } else { 4044 // This oop is not adjacent to the previous one, create new oop map 4045 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4046 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4047 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4048 nonstatic_oop_map_count += 1; 4049 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4050 first_nonstatic_oop_offset = real_offset; 4051 } 4052 } 4053 break; 4054 case NONSTATIC_BYTE: 4055 if( nonstatic_byte_space_count > 0 ) { 4056 real_offset = nonstatic_byte_space_offset; 4057 nonstatic_byte_space_offset += 1; 4058 nonstatic_byte_space_count -= 1; 4059 } else { 4060 real_offset = next_nonstatic_byte_offset; 4061 next_nonstatic_byte_offset += 1; 4062 } 4063 break; 4064 case NONSTATIC_SHORT: 4065 if( nonstatic_short_space_count > 0 ) { 4066 real_offset = nonstatic_short_space_offset; 4067 nonstatic_short_space_offset += BytesPerShort; 4068 nonstatic_short_space_count -= 1; 4069 } else { 4070 real_offset = next_nonstatic_short_offset; 4071 next_nonstatic_short_offset += BytesPerShort; 4072 } 4073 break; 4074 case NONSTATIC_WORD: 4075 if( nonstatic_word_space_count > 0 ) { 4076 real_offset = nonstatic_word_space_offset; 4077 nonstatic_word_space_offset += BytesPerInt; 4078 nonstatic_word_space_count -= 1; 4079 } else { 4080 real_offset = next_nonstatic_word_offset; 4081 next_nonstatic_word_offset += BytesPerInt; 4082 } 4083 break; 4084 case NONSTATIC_DOUBLE: 4085 real_offset = next_nonstatic_double_offset; 4086 next_nonstatic_double_offset += BytesPerLong; 4087 break; 4088 default: 4089 ShouldNotReachHere(); 4090 } 4091 fs.set_offset(real_offset); 4092 } 4093 4094 4095 // Handle the contended cases. 4096 // 4097 // Each contended field should not intersect the cache line with another contended field. 4098 // In the absence of alignment information, we end up with pessimistically separating 4099 // the fields with full-width padding. 4100 // 4101 // Additionally, this should not break alignment for the fields, so we round the alignment up 4102 // for each field. 4103 if (nonstatic_contended_count > 0) { 4104 4105 // if there is at least one contended field, we need to have pre-padding for them 4106 next_nonstatic_padded_offset += ContendedPaddingWidth; 4107 4108 // collect all contended groups 4109 ResourceBitMap bm(cp->size()); 4110 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4111 // skip already laid out fields 4112 if (fs.is_offset_set()) continue; 4113 4114 if (fs.is_contended()) { 4115 bm.set_bit(fs.contended_group()); 4116 } 4117 } 4118 4119 int current_group = -1; 4120 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 4121 4122 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) { 4123 4124 // skip already laid out fields 4125 if (fs.is_offset_set()) continue; 4126 4127 // skip non-contended fields and fields from different group 4128 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 4129 4130 // handle statics below 4131 if (fs.access_flags().is_static()) continue; 4132 4133 int real_offset = 0; 4134 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 4135 4136 switch (atype) { 4137 case NONSTATIC_BYTE: 4138 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, 1); 4139 real_offset = next_nonstatic_padded_offset; 4140 next_nonstatic_padded_offset += 1; 4141 break; 4142 4143 case NONSTATIC_SHORT: 4144 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerShort); 4145 real_offset = next_nonstatic_padded_offset; 4146 next_nonstatic_padded_offset += BytesPerShort; 4147 break; 4148 4149 case NONSTATIC_WORD: 4150 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerInt); 4151 real_offset = next_nonstatic_padded_offset; 4152 next_nonstatic_padded_offset += BytesPerInt; 4153 break; 4154 4155 case NONSTATIC_DOUBLE: 4156 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, BytesPerLong); 4157 real_offset = next_nonstatic_padded_offset; 4158 next_nonstatic_padded_offset += BytesPerLong; 4159 break; 4160 4161 case NONSTATIC_OOP: 4162 next_nonstatic_padded_offset = align_up(next_nonstatic_padded_offset, heapOopSize); 4163 real_offset = next_nonstatic_padded_offset; 4164 next_nonstatic_padded_offset += heapOopSize; 4165 4166 // Record this oop in the oop maps 4167 if( nonstatic_oop_map_count > 0 && 4168 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 4169 real_offset - 4170 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 4171 heapOopSize ) { 4172 // This oop is adjacent to the previous one, add to current oop map 4173 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 4174 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 4175 } else { 4176 // This oop is not adjacent to the previous one, create new oop map 4177 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 4178 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 4179 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 4180 nonstatic_oop_map_count += 1; 4181 if( first_nonstatic_oop_offset == 0 ) { // Undefined 4182 first_nonstatic_oop_offset = real_offset; 4183 } 4184 } 4185 break; 4186 4187 default: 4188 ShouldNotReachHere(); 4189 } 4190 4191 if (fs.contended_group() == 0) { 4192 // Contended group defines the equivalence class over the fields: 4193 // the fields within the same contended group are not inter-padded. 4194 // The only exception is default group, which does not incur the 4195 // equivalence, and so requires intra-padding. 4196 next_nonstatic_padded_offset += ContendedPaddingWidth; 4197 } 4198 4199 fs.set_offset(real_offset); 4200 } // for 4201 4202 // Start laying out the next group. 4203 // Note that this will effectively pad the last group in the back; 4204 // this is expected to alleviate memory contention effects for 4205 // subclass fields and/or adjacent object. 4206 // If this was the default group, the padding is already in place. 4207 if (current_group != 0) { 4208 next_nonstatic_padded_offset += ContendedPaddingWidth; 4209 } 4210 } 4211 4212 // handle static fields 4213 } 4214 4215 // Entire class is contended, pad in the back. 4216 // This helps to alleviate memory contention effects for subclass fields 4217 // and/or adjacent object. 4218 if (is_contended_class) { 4219 next_nonstatic_padded_offset += ContendedPaddingWidth; 4220 } 4221 4222 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 4223 4224 int nonstatic_fields_end = align_up(notaligned_nonstatic_fields_end, heapOopSize); 4225 int instance_end = align_up(notaligned_nonstatic_fields_end, wordSize); 4226 int static_fields_end = align_up(next_static_byte_offset, wordSize); 4227 4228 int static_field_size = (static_fields_end - 4229 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 4230 nonstatic_field_size = nonstatic_field_size + 4231 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 4232 4233 int instance_size = align_object_size(instance_end / wordSize); 4234 4235 assert(instance_size == align_object_size(align_up( 4236 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 4237 wordSize) / wordSize), "consistent layout helper value"); 4238 4239 // Invariant: nonstatic_field end/start should only change if there are 4240 // nonstatic fields in the class, or if the class is contended. We compare 4241 // against the non-aligned value, so that end alignment will not fail the 4242 // assert without actually having the fields. 4243 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 4244 is_contended_class || 4245 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 4246 4247 // Number of non-static oop map blocks allocated at end of klass. 4248 const unsigned int total_oop_map_count = 4249 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 4250 first_nonstatic_oop_offset); 4251 4252 #ifndef PRODUCT 4253 if (PrintFieldLayout) { 4254 print_field_layout(_class_name, 4255 _fields, 4256 cp, 4257 instance_size, 4258 nonstatic_fields_start, 4259 nonstatic_fields_end, 4260 static_fields_end); 4261 } 4262 4263 #endif 4264 // Pass back information needed for InstanceKlass creation 4265 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 4266 info->nonstatic_oop_counts = nonstatic_oop_counts; 4267 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 4268 info->total_oop_map_count = total_oop_map_count; 4269 info->instance_size = instance_size; 4270 info->static_field_size = static_field_size; 4271 info->nonstatic_field_size = nonstatic_field_size; 4272 info->has_nonstatic_fields = has_nonstatic_fields; 4273 } 4274 4275 static void fill_oop_maps(const InstanceKlass* k, 4276 unsigned int nonstatic_oop_map_count, 4277 const int* nonstatic_oop_offsets, 4278 const unsigned int* nonstatic_oop_counts) { 4279 4280 assert(k != NULL, "invariant"); 4281 4282 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4283 const InstanceKlass* const super = k->superklass(); 4284 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4285 if (super_count > 0) { 4286 // Copy maps from superklass 4287 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4288 for (unsigned int i = 0; i < super_count; ++i) { 4289 *this_oop_map++ = *super_oop_map++; 4290 } 4291 } 4292 4293 if (nonstatic_oop_map_count > 0) { 4294 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4295 // The counts differ because there is no gap between superklass's last oop 4296 // field and the first local oop field. Extend the last oop map copied 4297 // from the superklass instead of creating new one. 4298 nonstatic_oop_map_count--; 4299 nonstatic_oop_offsets++; 4300 this_oop_map--; 4301 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4302 this_oop_map++; 4303 } 4304 4305 // Add new map blocks, fill them 4306 while (nonstatic_oop_map_count-- > 0) { 4307 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4308 this_oop_map->set_count(*nonstatic_oop_counts++); 4309 this_oop_map++; 4310 } 4311 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4312 this_oop_map, "sanity"); 4313 } 4314 } 4315 4316 4317 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { 4318 assert(ik != NULL, "invariant"); 4319 4320 const Klass* const super = ik->super(); 4321 4322 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4323 // in which case we don't have to register objects as finalizable 4324 if (!_has_empty_finalizer) { 4325 if (_has_finalizer || 4326 (super != NULL && super->has_finalizer())) { 4327 ik->set_has_finalizer(); 4328 } 4329 } 4330 4331 #ifdef ASSERT 4332 bool f = false; 4333 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), 4334 vmSymbols::void_method_signature()); 4335 if (m != NULL && !m->is_empty_method()) { 4336 f = true; 4337 } 4338 4339 // Spec doesn't prevent agent from redefinition of empty finalizer. 4340 // Despite the fact that it's generally bad idea and redefined finalizer 4341 // will not work as expected we shouldn't abort vm in this case 4342 if (!ik->has_redefined_this_or_super()) { 4343 assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); 4344 } 4345 #endif 4346 4347 // Check if this klass supports the java.lang.Cloneable interface 4348 if (SystemDictionary::Cloneable_klass_loaded()) { 4349 if (ik->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4350 ik->set_is_cloneable(); 4351 } 4352 } 4353 4354 // Check if this klass has a vanilla default constructor 4355 if (super == NULL) { 4356 // java.lang.Object has empty default constructor 4357 ik->set_has_vanilla_constructor(); 4358 } else { 4359 if (super->has_vanilla_constructor() && 4360 _has_vanilla_constructor) { 4361 ik->set_has_vanilla_constructor(); 4362 } 4363 #ifdef ASSERT 4364 bool v = false; 4365 if (super->has_vanilla_constructor()) { 4366 const Method* const constructor = 4367 ik->find_method(vmSymbols::object_initializer_name(), 4368 vmSymbols::void_method_signature()); 4369 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4370 v = true; 4371 } 4372 } 4373 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4374 #endif 4375 } 4376 4377 // If it cannot be fast-path allocated, set a bit in the layout helper. 4378 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4379 assert(ik->size_helper() > 0, "layout_helper is initialized"); 4380 if ((!RegisterFinalizersAtInit && ik->has_finalizer()) 4381 || ik->is_abstract() || ik->is_interface() 4382 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL) 4383 || ik->size_helper() >= FastAllocateSizeLimit) { 4384 // Forbid fast-path allocation. 4385 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); 4386 ik->set_layout_helper(lh); 4387 } 4388 } 4389 4390 // Attach super classes and interface classes to class loader data 4391 static void record_defined_class_dependencies(const InstanceKlass* defined_klass, 4392 TRAPS) { 4393 assert(defined_klass != NULL, "invariant"); 4394 4395 ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data(); 4396 if (defining_loader_data->is_the_null_class_loader_data()) { 4397 // Dependencies to null class loader data are implicit. 4398 return; 4399 } else { 4400 // add super class dependency 4401 Klass* const super = defined_klass->super(); 4402 if (super != NULL) { 4403 defining_loader_data->record_dependency(super); 4404 } 4405 4406 // add super interface dependencies 4407 const Array<Klass*>* const local_interfaces = defined_klass->local_interfaces(); 4408 if (local_interfaces != NULL) { 4409 const int length = local_interfaces->length(); 4410 for (int i = 0; i < length; i++) { 4411 defining_loader_data->record_dependency(local_interfaces->at(i)); 4412 } 4413 } 4414 } 4415 } 4416 4417 // utility methods for appending an array with check for duplicates 4418 4419 static void append_interfaces(GrowableArray<Klass*>* result, 4420 const Array<Klass*>* const ifs) { 4421 // iterate over new interfaces 4422 for (int i = 0; i < ifs->length(); i++) { 4423 Klass* const e = ifs->at(i); 4424 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4425 // add new interface 4426 result->append_if_missing(e); 4427 } 4428 } 4429 4430 static Array<Klass*>* compute_transitive_interfaces(const InstanceKlass* super, 4431 Array<Klass*>* local_ifs, 4432 ClassLoaderData* loader_data, 4433 TRAPS) { 4434 assert(local_ifs != NULL, "invariant"); 4435 assert(loader_data != NULL, "invariant"); 4436 4437 // Compute maximum size for transitive interfaces 4438 int max_transitive_size = 0; 4439 int super_size = 0; 4440 // Add superclass transitive interfaces size 4441 if (super != NULL) { 4442 super_size = super->transitive_interfaces()->length(); 4443 max_transitive_size += super_size; 4444 } 4445 // Add local interfaces' super interfaces 4446 const int local_size = local_ifs->length(); 4447 for (int i = 0; i < local_size; i++) { 4448 Klass* const l = local_ifs->at(i); 4449 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4450 } 4451 // Finally add local interfaces 4452 max_transitive_size += local_size; 4453 // Construct array 4454 if (max_transitive_size == 0) { 4455 // no interfaces, use canonicalized array 4456 return Universe::the_empty_klass_array(); 4457 } else if (max_transitive_size == super_size) { 4458 // no new local interfaces added, share superklass' transitive interface array 4459 return super->transitive_interfaces(); 4460 } else if (max_transitive_size == local_size) { 4461 // only local interfaces added, share local interface array 4462 return local_ifs; 4463 } else { 4464 ResourceMark rm; 4465 GrowableArray<Klass*>* const result = new GrowableArray<Klass*>(max_transitive_size); 4466 4467 // Copy down from superclass 4468 if (super != NULL) { 4469 append_interfaces(result, super->transitive_interfaces()); 4470 } 4471 4472 // Copy down from local interfaces' superinterfaces 4473 for (int i = 0; i < local_size; i++) { 4474 Klass* const l = local_ifs->at(i); 4475 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4476 } 4477 // Finally add local interfaces 4478 append_interfaces(result, local_ifs); 4479 4480 // length will be less than the max_transitive_size if duplicates were removed 4481 const int length = result->length(); 4482 assert(length <= max_transitive_size, "just checking"); 4483 Array<Klass*>* const new_result = 4484 MetadataFactory::new_array<Klass*>(loader_data, length, CHECK_NULL); 4485 for (int i = 0; i < length; i++) { 4486 Klass* const e = result->at(i); 4487 assert(e != NULL, "just checking"); 4488 new_result->at_put(i, e); 4489 } 4490 return new_result; 4491 } 4492 } 4493 4494 static void check_super_class_access(const InstanceKlass* this_klass, TRAPS) { 4495 assert(this_klass != NULL, "invariant"); 4496 const Klass* const super = this_klass->super(); 4497 if (super != NULL) { 4498 4499 // If the loader is not the boot loader then throw an exception if its 4500 // superclass is in package jdk.internal.reflect and its loader is not a 4501 // special reflection class loader 4502 if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) { 4503 assert(super->is_instance_klass(), "super is not instance klass"); 4504 PackageEntry* super_package = super->package(); 4505 if (super_package != NULL && 4506 super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 && 4507 !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) { 4508 ResourceMark rm(THREAD); 4509 Exceptions::fthrow( 4510 THREAD_AND_LOCATION, 4511 vmSymbols::java_lang_IllegalAccessError(), 4512 "class %s loaded by %s cannot access jdk/internal/reflect superclass %s", 4513 this_klass->external_name(), 4514 this_klass->class_loader_data()->loader_name_and_id(), 4515 super->external_name()); 4516 return; 4517 } 4518 } 4519 4520 Reflection::VerifyClassAccessResults vca_result = 4521 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); 4522 if (vca_result != Reflection::ACCESS_OK) { 4523 ResourceMark rm(THREAD); 4524 char* msg = Reflection::verify_class_access_msg(this_klass, 4525 InstanceKlass::cast(super), 4526 vca_result); 4527 if (msg == NULL) { 4528 Exceptions::fthrow( 4529 THREAD_AND_LOCATION, 4530 vmSymbols::java_lang_IllegalAccessError(), 4531 "class %s cannot access its %ssuperclass %s (%s is in loader %s; %s is in loader %s)", 4532 this_klass->external_name(), 4533 super->is_abstract() ? "abstract " : "", 4534 super->external_name(), 4535 this_klass->external_name(), 4536 this_klass->class_loader_data()->loader_name_and_id(), 4537 super->external_name(), 4538 super->class_loader_data()->loader_name_and_id()); 4539 } else { 4540 // Add additional message content. 4541 Exceptions::fthrow( 4542 THREAD_AND_LOCATION, 4543 vmSymbols::java_lang_IllegalAccessError(), 4544 "superclass access check failed: %s", 4545 msg); 4546 } 4547 } 4548 } 4549 } 4550 4551 4552 static void check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { 4553 assert(this_klass != NULL, "invariant"); 4554 const Array<Klass*>* const local_interfaces = this_klass->local_interfaces(); 4555 const int lng = local_interfaces->length(); 4556 for (int i = lng - 1; i >= 0; i--) { 4557 Klass* const k = local_interfaces->at(i); 4558 assert (k != NULL && k->is_interface(), "invalid interface"); 4559 Reflection::VerifyClassAccessResults vca_result = 4560 Reflection::verify_class_access(this_klass, InstanceKlass::cast(k), false); 4561 if (vca_result != Reflection::ACCESS_OK) { 4562 ResourceMark rm(THREAD); 4563 char* msg = Reflection::verify_class_access_msg(this_klass, 4564 InstanceKlass::cast(k), 4565 vca_result); 4566 if (msg == NULL) { 4567 Exceptions::fthrow( 4568 THREAD_AND_LOCATION, 4569 vmSymbols::java_lang_IllegalAccessError(), 4570 "class %s cannot access its superinterface %s (%s is in loader %s; %s is in loader %s)", 4571 this_klass->external_name(), 4572 k->external_name(), 4573 this_klass->external_name(), 4574 this_klass->class_loader_data()->loader_name_and_id(), 4575 k->external_name(), 4576 k->class_loader_data()->loader_name_and_id()); 4577 } else { 4578 // Add additional message content. 4579 Exceptions::fthrow( 4580 THREAD_AND_LOCATION, 4581 vmSymbols::java_lang_IllegalAccessError(), 4582 "superinterface check failed: %s", 4583 msg); 4584 } 4585 } 4586 } 4587 } 4588 4589 4590 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { 4591 assert(this_klass != NULL, "invariant"); 4592 const Array<Method*>* const methods = this_klass->methods(); 4593 const int num_methods = methods->length(); 4594 4595 // go thru each method and check if it overrides a final method 4596 for (int index = 0; index < num_methods; index++) { 4597 const Method* const m = methods->at(index); 4598 4599 // skip private, static, and <init> methods 4600 if ((!m->is_private() && !m->is_static()) && 4601 (m->name() != vmSymbols::object_initializer_name())) { 4602 4603 const Symbol* const name = m->name(); 4604 const Symbol* const signature = m->signature(); 4605 const Klass* k = this_klass->super(); 4606 const Method* super_m = NULL; 4607 while (k != NULL) { 4608 // skip supers that don't have final methods. 4609 if (k->has_final_method()) { 4610 // lookup a matching method in the super class hierarchy 4611 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4612 if (super_m == NULL) { 4613 break; // didn't find any match; get out 4614 } 4615 4616 if (super_m->is_final() && !super_m->is_static() && 4617 // matching method in super is final, and not static 4618 (Reflection::verify_field_access(this_klass, 4619 super_m->method_holder(), 4620 super_m->method_holder(), 4621 super_m->access_flags(), false)) 4622 // this class can access super final method and therefore override 4623 ) { 4624 ResourceMark rm(THREAD); 4625 Exceptions::fthrow( 4626 THREAD_AND_LOCATION, 4627 vmSymbols::java_lang_VerifyError(), 4628 "class %s overrides final method %s.%s%s", 4629 this_klass->external_name(), 4630 super_m->method_holder()->external_name(), 4631 name->as_C_string(), 4632 signature->as_C_string() 4633 ); 4634 return; 4635 } 4636 4637 // continue to look from super_m's holder's super. 4638 k = super_m->method_holder()->super(); 4639 continue; 4640 } 4641 4642 k = k->super(); 4643 } 4644 } 4645 } 4646 } 4647 4648 4649 // assumes that this_klass is an interface 4650 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { 4651 assert(this_klass != NULL, "invariant"); 4652 assert(this_klass->is_interface(), "not an interface"); 4653 const Array<Method*>* methods = this_klass->methods(); 4654 const int num_methods = methods->length(); 4655 4656 for (int index = 0; index < num_methods; index++) { 4657 const Method* const m = methods->at(index); 4658 // if m is static and not the init method, throw a verify error 4659 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4660 ResourceMark rm(THREAD); 4661 Exceptions::fthrow( 4662 THREAD_AND_LOCATION, 4663 vmSymbols::java_lang_VerifyError(), 4664 "Illegal static method %s in interface %s", 4665 m->name()->as_C_string(), 4666 this_klass->external_name() 4667 ); 4668 return; 4669 } 4670 } 4671 } 4672 4673 // utility methods for format checking 4674 4675 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { 4676 const bool is_module = (flags & JVM_ACC_MODULE) != 0; 4677 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); 4678 if (is_module) { 4679 ResourceMark rm(THREAD); 4680 Exceptions::fthrow( 4681 THREAD_AND_LOCATION, 4682 vmSymbols::java_lang_NoClassDefFoundError(), 4683 "%s is not a class because access_flag ACC_MODULE is set", 4684 _class_name->as_C_string()); 4685 return; 4686 } 4687 4688 if (!_need_verify) { return; } 4689 4690 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4691 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4692 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4693 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4694 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4695 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4696 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4697 4698 if ((is_abstract && is_final) || 4699 (is_interface && !is_abstract) || 4700 (is_interface && major_gte_15 && (is_super || is_enum)) || 4701 (!is_interface && major_gte_15 && is_annotation)) { 4702 ResourceMark rm(THREAD); 4703 Exceptions::fthrow( 4704 THREAD_AND_LOCATION, 4705 vmSymbols::java_lang_ClassFormatError(), 4706 "Illegal class modifiers in class %s: 0x%X", 4707 _class_name->as_C_string(), flags 4708 ); 4709 return; 4710 } 4711 } 4712 4713 static bool has_illegal_visibility(jint flags) { 4714 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4715 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4716 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4717 4718 return ((is_public && is_protected) || 4719 (is_public && is_private) || 4720 (is_protected && is_private)); 4721 } 4722 4723 // A legal major_version.minor_version must be one of the following: 4724 // 4725 // Major_version = 45, any minor_version. 4726 // Major_version >= 46 and major_version <= current_major_version and minor_version = 0. 4727 // Major_version = current_major_version and minor_version = 65535 and --enable-preview is present. 4728 // 4729 static void verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ 4730 const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; 4731 if (major != JAVA_MIN_SUPPORTED_VERSION) { // All 45.* are ok including 45.65535 4732 if (minor == JAVA_PREVIEW_MINOR_VERSION) { 4733 if (major != max_version) { 4734 ResourceMark rm(THREAD); 4735 Exceptions::fthrow( 4736 THREAD_AND_LOCATION, 4737 vmSymbols::java_lang_UnsupportedClassVersionError(), 4738 "%s (class file version %u.%u) was compiled with preview features that are unsupported. " 4739 "This version of the Java Runtime only recognizes preview features for class file version %u.%u", 4740 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); 4741 return; 4742 } 4743 4744 if (!Arguments::enable_preview()) { 4745 ResourceMark rm(THREAD); 4746 Exceptions::fthrow( 4747 THREAD_AND_LOCATION, 4748 vmSymbols::java_lang_UnsupportedClassVersionError(), 4749 "Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", 4750 class_name->as_C_string(), major, minor); 4751 return; 4752 } 4753 4754 } else { // minor != JAVA_PREVIEW_MINOR_VERSION 4755 if (major > max_version) { 4756 ResourceMark rm(THREAD); 4757 Exceptions::fthrow( 4758 THREAD_AND_LOCATION, 4759 vmSymbols::java_lang_UnsupportedClassVersionError(), 4760 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 4761 "this version of the Java Runtime only recognizes class file versions up to %u.0", 4762 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); 4763 } else if (major < JAVA_MIN_SUPPORTED_VERSION) { 4764 ResourceMark rm(THREAD); 4765 Exceptions::fthrow( 4766 THREAD_AND_LOCATION, 4767 vmSymbols::java_lang_UnsupportedClassVersionError(), 4768 "%s (class file version %u.%u) was compiled with an invalid major version", 4769 class_name->as_C_string(), major, minor); 4770 } else if (minor != 0) { 4771 ResourceMark rm(THREAD); 4772 Exceptions::fthrow( 4773 THREAD_AND_LOCATION, 4774 vmSymbols::java_lang_UnsupportedClassVersionError(), 4775 "%s (class file version %u.%u) was compiled with an invalid non-zero minor version", 4776 class_name->as_C_string(), major, minor); 4777 } 4778 } 4779 } 4780 } 4781 4782 void ClassFileParser::verify_legal_field_modifiers(jint flags, 4783 bool is_interface, 4784 TRAPS) const { 4785 if (!_need_verify) { return; } 4786 4787 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4788 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4789 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4790 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4791 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4792 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4793 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4794 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4795 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4796 4797 bool is_illegal = false; 4798 4799 if (is_interface) { 4800 if (!is_public || !is_static || !is_final || is_private || 4801 is_protected || is_volatile || is_transient || 4802 (major_gte_15 && is_enum)) { 4803 is_illegal = true; 4804 } 4805 } else { // not interface 4806 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4807 is_illegal = true; 4808 } 4809 } 4810 4811 if (is_illegal) { 4812 ResourceMark rm(THREAD); 4813 Exceptions::fthrow( 4814 THREAD_AND_LOCATION, 4815 vmSymbols::java_lang_ClassFormatError(), 4816 "Illegal field modifiers in class %s: 0x%X", 4817 _class_name->as_C_string(), flags); 4818 return; 4819 } 4820 } 4821 4822 void ClassFileParser::verify_legal_method_modifiers(jint flags, 4823 bool is_interface, 4824 const Symbol* name, 4825 TRAPS) const { 4826 if (!_need_verify) { return; } 4827 4828 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4829 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4830 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4831 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4832 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4833 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4834 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4835 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4836 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4837 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4838 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4839 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4840 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4841 4842 bool is_illegal = false; 4843 4844 if (is_interface) { 4845 if (major_gte_8) { 4846 // Class file version is JAVA_8_VERSION or later Methods of 4847 // interfaces may set any of the flags except ACC_PROTECTED, 4848 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4849 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4850 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4851 (is_native || is_protected || is_final || is_synchronized) || 4852 // If a specific method of a class or interface has its 4853 // ACC_ABSTRACT flag set, it must not have any of its 4854 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4855 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4856 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4857 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4858 (is_abstract && (is_private || is_static || is_strict))) { 4859 is_illegal = true; 4860 } 4861 } else if (major_gte_15) { 4862 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4863 if (!is_public || is_private || is_protected || is_static || is_final || 4864 is_synchronized || is_native || !is_abstract || is_strict) { 4865 is_illegal = true; 4866 } 4867 } else { 4868 // Class file version is pre-JAVA_1_5_VERSION 4869 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4870 is_illegal = true; 4871 } 4872 } 4873 } else { // not interface 4874 if (has_illegal_visibility(flags)) { 4875 is_illegal = true; 4876 } else { 4877 if (is_initializer) { 4878 if (is_static || is_final || is_synchronized || is_native || 4879 is_abstract || (major_gte_15 && is_bridge)) { 4880 is_illegal = true; 4881 } 4882 } else { // not initializer 4883 if (is_abstract) { 4884 if ((is_final || is_native || is_private || is_static || 4885 (major_gte_15 && (is_synchronized || is_strict)))) { 4886 is_illegal = true; 4887 } 4888 } 4889 } 4890 } 4891 } 4892 4893 if (is_illegal) { 4894 ResourceMark rm(THREAD); 4895 Exceptions::fthrow( 4896 THREAD_AND_LOCATION, 4897 vmSymbols::java_lang_ClassFormatError(), 4898 "Method %s in class %s has illegal modifiers: 0x%X", 4899 name->as_C_string(), _class_name->as_C_string(), flags); 4900 return; 4901 } 4902 } 4903 4904 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, 4905 int length, 4906 TRAPS) const { 4907 assert(_need_verify, "only called when _need_verify is true"); 4908 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) { 4909 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4910 } 4911 } 4912 4913 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4914 // In class names, '/' separates unqualified names. This is verified in this function also. 4915 // Method names also may not contain the characters '<' or '>', unless <init> 4916 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4917 // method. Because these names have been checked as special cases before 4918 // calling this method in verify_legal_method_name. 4919 // 4920 // This method is also called from the modular system APIs in modules.cpp 4921 // to verify the validity of module and package names. 4922 bool ClassFileParser::verify_unqualified_name(const char* name, 4923 unsigned int length, 4924 int type) { 4925 for (const char* p = name; p != name + length;) { 4926 jchar ch = *p; 4927 if (ch < 128) { 4928 if (ch == '.' || ch == ';' || ch == '[' ) { 4929 return false; // do not permit '.', ';', or '[' 4930 } 4931 if (ch == '/') { 4932 // check for '//' or leading or trailing '/' which are not legal 4933 // unqualified name must not be empty 4934 if (type == ClassFileParser::LegalClass) { 4935 if (p == name || p+1 >= name+length || *(p+1) == '/') { 4936 return false; 4937 } 4938 } else { 4939 return false; // do not permit '/' unless it's class name 4940 } 4941 } 4942 if (type == ClassFileParser::LegalMethod && (ch == '<' || ch == '>')) { 4943 return false; // do not permit '<' or '>' in method names 4944 } 4945 p++; 4946 } else { 4947 char* tmp_p = UTF8::next(p, &ch); 4948 p = tmp_p; 4949 } 4950 } 4951 return true; 4952 } 4953 4954 // Take pointer to a string. Skip over the longest part of the string that could 4955 // be taken as a fieldname. Allow '/' if slash_ok is true. 4956 // Return a pointer to just past the fieldname. 4957 // Return NULL if no fieldname at all was found, or in the case of slash_ok 4958 // being true, we saw consecutive slashes (meaning we were looking for a 4959 // qualified path but found something that was badly-formed). 4960 static const char* skip_over_field_name(const char* name, 4961 bool slash_ok, 4962 unsigned int length) { 4963 const char* p; 4964 jboolean last_is_slash = false; 4965 jboolean not_first_ch = false; 4966 4967 for (p = name; p != name + length; not_first_ch = true) { 4968 const char* old_p = p; 4969 jchar ch = *p; 4970 if (ch < 128) { 4971 p++; 4972 // quick check for ascii 4973 if ((ch >= 'a' && ch <= 'z') || 4974 (ch >= 'A' && ch <= 'Z') || 4975 (ch == '_' || ch == '$') || 4976 (not_first_ch && ch >= '0' && ch <= '9')) { 4977 last_is_slash = false; 4978 continue; 4979 } 4980 if (slash_ok && ch == '/') { 4981 if (last_is_slash) { 4982 return NULL; // Don't permit consecutive slashes 4983 } 4984 last_is_slash = true; 4985 continue; 4986 } 4987 } 4988 else { 4989 jint unicode_ch; 4990 char* tmp_p = UTF8::next_character(p, &unicode_ch); 4991 p = tmp_p; 4992 last_is_slash = false; 4993 // Check if ch is Java identifier start or is Java identifier part 4994 // 4672820: call java.lang.Character methods directly without generating separate tables. 4995 EXCEPTION_MARK; 4996 4997 // return value 4998 JavaValue result(T_BOOLEAN); 4999 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5000 JavaCallArguments args; 5001 args.push_int(unicode_ch); 5002 5003 // public static boolean isJavaIdentifierStart(char ch); 5004 JavaCalls::call_static(&result, 5005 SystemDictionary::Character_klass(), 5006 vmSymbols::isJavaIdentifierStart_name(), 5007 vmSymbols::int_bool_signature(), 5008 &args, 5009 THREAD); 5010 5011 if (HAS_PENDING_EXCEPTION) { 5012 CLEAR_PENDING_EXCEPTION; 5013 return 0; 5014 } 5015 if (result.get_jboolean()) { 5016 continue; 5017 } 5018 5019 if (not_first_ch) { 5020 // public static boolean isJavaIdentifierPart(char ch); 5021 JavaCalls::call_static(&result, 5022 SystemDictionary::Character_klass(), 5023 vmSymbols::isJavaIdentifierPart_name(), 5024 vmSymbols::int_bool_signature(), 5025 &args, 5026 THREAD); 5027 5028 if (HAS_PENDING_EXCEPTION) { 5029 CLEAR_PENDING_EXCEPTION; 5030 return 0; 5031 } 5032 5033 if (result.get_jboolean()) { 5034 continue; 5035 } 5036 } 5037 } 5038 return (not_first_ch) ? old_p : NULL; 5039 } 5040 return (not_first_ch) ? p : NULL; 5041 } 5042 5043 // Take pointer to a string. Skip over the longest part of the string that could 5044 // be taken as a field signature. Allow "void" if void_ok. 5045 // Return a pointer to just past the signature. 5046 // Return NULL if no legal signature is found. 5047 const char* ClassFileParser::skip_over_field_signature(const char* signature, 5048 bool void_ok, 5049 unsigned int length, 5050 TRAPS) const { 5051 unsigned int array_dim = 0; 5052 while (length > 0) { 5053 switch (signature[0]) { 5054 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5055 case JVM_SIGNATURE_BOOLEAN: 5056 case JVM_SIGNATURE_BYTE: 5057 case JVM_SIGNATURE_CHAR: 5058 case JVM_SIGNATURE_SHORT: 5059 case JVM_SIGNATURE_INT: 5060 case JVM_SIGNATURE_FLOAT: 5061 case JVM_SIGNATURE_LONG: 5062 case JVM_SIGNATURE_DOUBLE: 5063 return signature + 1; 5064 case JVM_SIGNATURE_CLASS: { 5065 if (_major_version < JAVA_1_5_VERSION) { 5066 // Skip over the class name if one is there 5067 const char* const p = skip_over_field_name(signature + 1, true, --length); 5068 5069 // The next character better be a semicolon 5070 if (p && (p - signature) > 1 && p[0] == ';') { 5071 return p + 1; 5072 } 5073 } 5074 else { 5075 // Skip leading 'L' and ignore first appearance of ';' 5076 length--; 5077 signature++; 5078 char* c = strchr((char*) signature, ';'); 5079 // Format check signature 5080 if (c != NULL) { 5081 ResourceMark rm(THREAD); 5082 int newlen = c - (char*) signature; 5083 char* sig = NEW_RESOURCE_ARRAY(char, newlen + 1); 5084 strncpy(sig, signature, newlen); 5085 sig[newlen] = '\0'; 5086 5087 bool legal = verify_unqualified_name(sig, newlen, LegalClass); 5088 if (!legal) { 5089 classfile_parse_error("Class name contains illegal character " 5090 "in descriptor in class file %s", 5091 CHECK_0); 5092 return NULL; 5093 } 5094 return signature + newlen + 1; 5095 } 5096 } 5097 return NULL; 5098 } 5099 case JVM_SIGNATURE_ARRAY: 5100 array_dim++; 5101 if (array_dim > 255) { 5102 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5103 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5104 } 5105 // The rest of what's there better be a legal signature 5106 signature++; 5107 length--; 5108 void_ok = false; 5109 break; 5110 default: 5111 return NULL; 5112 } 5113 } 5114 return NULL; 5115 } 5116 5117 // Checks if name is a legal class name. 5118 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { 5119 if (!_need_verify || _relax_verify) { return; } 5120 5121 char buf[fixed_buffer_size]; 5122 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5123 unsigned int length = name->utf8_length(); 5124 bool legal = false; 5125 5126 if (length > 0) { 5127 const char* p; 5128 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5129 p = skip_over_field_signature(bytes, false, length, CHECK); 5130 legal = (p != NULL) && ((p - bytes) == (int)length); 5131 } else if (_major_version < JAVA_1_5_VERSION) { 5132 if (bytes[0] != '<') { 5133 p = skip_over_field_name(bytes, true, length); 5134 legal = (p != NULL) && ((p - bytes) == (int)length); 5135 } 5136 } else { 5137 // 4900761: relax the constraints based on JSR202 spec 5138 // Class names may be drawn from the entire Unicode character set. 5139 // Identifiers between '/' must be unqualified names. 5140 // The utf8 string has been verified when parsing cpool entries. 5141 legal = verify_unqualified_name(bytes, length, LegalClass); 5142 } 5143 } 5144 if (!legal) { 5145 ResourceMark rm(THREAD); 5146 assert(_class_name != NULL, "invariant"); 5147 Exceptions::fthrow( 5148 THREAD_AND_LOCATION, 5149 vmSymbols::java_lang_ClassFormatError(), 5150 "Illegal class name \"%s\" in class file %s", bytes, 5151 _class_name->as_C_string() 5152 ); 5153 return; 5154 } 5155 } 5156 5157 // Checks if name is a legal field name. 5158 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { 5159 if (!_need_verify || _relax_verify) { return; } 5160 5161 char buf[fixed_buffer_size]; 5162 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5163 unsigned int length = name->utf8_length(); 5164 bool legal = false; 5165 5166 if (length > 0) { 5167 if (_major_version < JAVA_1_5_VERSION) { 5168 if (bytes[0] != '<') { 5169 const char* p = skip_over_field_name(bytes, false, length); 5170 legal = (p != NULL) && ((p - bytes) == (int)length); 5171 } 5172 } else { 5173 // 4881221: relax the constraints based on JSR202 spec 5174 legal = verify_unqualified_name(bytes, length, LegalField); 5175 } 5176 } 5177 5178 if (!legal) { 5179 ResourceMark rm(THREAD); 5180 assert(_class_name != NULL, "invariant"); 5181 Exceptions::fthrow( 5182 THREAD_AND_LOCATION, 5183 vmSymbols::java_lang_ClassFormatError(), 5184 "Illegal field name \"%s\" in class %s", bytes, 5185 _class_name->as_C_string() 5186 ); 5187 return; 5188 } 5189 } 5190 5191 // Checks if name is a legal method name. 5192 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { 5193 if (!_need_verify || _relax_verify) { return; } 5194 5195 assert(name != NULL, "method name is null"); 5196 char buf[fixed_buffer_size]; 5197 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5198 unsigned int length = name->utf8_length(); 5199 bool legal = false; 5200 5201 if (length > 0) { 5202 if (bytes[0] == '<') { 5203 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5204 legal = true; 5205 } 5206 } else if (_major_version < JAVA_1_5_VERSION) { 5207 const char* p; 5208 p = skip_over_field_name(bytes, false, length); 5209 legal = (p != NULL) && ((p - bytes) == (int)length); 5210 } else { 5211 // 4881221: relax the constraints based on JSR202 spec 5212 legal = verify_unqualified_name(bytes, length, LegalMethod); 5213 } 5214 } 5215 5216 if (!legal) { 5217 ResourceMark rm(THREAD); 5218 assert(_class_name != NULL, "invariant"); 5219 Exceptions::fthrow( 5220 THREAD_AND_LOCATION, 5221 vmSymbols::java_lang_ClassFormatError(), 5222 "Illegal method name \"%s\" in class %s", bytes, 5223 _class_name->as_C_string() 5224 ); 5225 return; 5226 } 5227 } 5228 5229 5230 // Checks if signature is a legal field signature. 5231 void ClassFileParser::verify_legal_field_signature(const Symbol* name, 5232 const Symbol* signature, 5233 TRAPS) const { 5234 if (!_need_verify) { return; } 5235 5236 char buf[fixed_buffer_size]; 5237 const char* const bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5238 const unsigned int length = signature->utf8_length(); 5239 const char* const p = skip_over_field_signature(bytes, false, length, CHECK); 5240 5241 if (p == NULL || (p - bytes) != (int)length) { 5242 throwIllegalSignature("Field", name, signature, CHECK); 5243 } 5244 } 5245 5246 // Checks if signature is a legal method signature. 5247 // Returns number of parameters 5248 int ClassFileParser::verify_legal_method_signature(const Symbol* name, 5249 const Symbol* signature, 5250 TRAPS) const { 5251 if (!_need_verify) { 5252 // make sure caller's args_size will be less than 0 even for non-static 5253 // method so it will be recomputed in compute_size_of_parameters(). 5254 return -2; 5255 } 5256 5257 // Class initializers cannot have args for class format version >= 51. 5258 if (name == vmSymbols::class_initializer_name() && 5259 signature != vmSymbols::void_method_signature() && 5260 _major_version >= JAVA_7_VERSION) { 5261 throwIllegalSignature("Method", name, signature, CHECK_0); 5262 return 0; 5263 } 5264 5265 unsigned int args_size = 0; 5266 char buf[fixed_buffer_size]; 5267 const char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5268 unsigned int length = signature->utf8_length(); 5269 const char* nextp; 5270 5271 // The first character must be a '(' 5272 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5273 length--; 5274 // Skip over legal field signatures 5275 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5276 while ((length > 0) && (nextp != NULL)) { 5277 args_size++; 5278 if (p[0] == 'J' || p[0] == 'D') { 5279 args_size++; 5280 } 5281 length -= nextp - p; 5282 p = nextp; 5283 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5284 } 5285 // The first non-signature thing better be a ')' 5286 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5287 length--; 5288 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5289 // All internal methods must return void 5290 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5291 return args_size; 5292 } 5293 } else { 5294 // Now we better just have a return value 5295 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5296 if (nextp && ((int)length == (nextp - p))) { 5297 return args_size; 5298 } 5299 } 5300 } 5301 } 5302 // Report error 5303 throwIllegalSignature("Method", name, signature, CHECK_0); 5304 return 0; 5305 } 5306 5307 int ClassFileParser::static_field_size() const { 5308 assert(_field_info != NULL, "invariant"); 5309 return _field_info->static_field_size; 5310 } 5311 5312 int ClassFileParser::total_oop_map_count() const { 5313 assert(_field_info != NULL, "invariant"); 5314 return _field_info->total_oop_map_count; 5315 } 5316 5317 jint ClassFileParser::layout_size() const { 5318 assert(_field_info != NULL, "invariant"); 5319 return _field_info->instance_size; 5320 } 5321 5322 static void check_methods_for_intrinsics(const InstanceKlass* ik, 5323 const Array<Method*>* methods) { 5324 assert(ik != NULL, "invariant"); 5325 assert(methods != NULL, "invariant"); 5326 5327 // Set up Method*::intrinsic_id as soon as we know the names of methods. 5328 // (We used to do this lazily, but now we query it in Rewriter, 5329 // which is eagerly done for every method, so we might as well do it now, 5330 // when everything is fresh in memory.) 5331 const vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(ik); 5332 5333 if (klass_id != vmSymbols::NO_SID) { 5334 for (int j = 0; j < methods->length(); ++j) { 5335 Method* method = methods->at(j); 5336 method->init_intrinsic_id(); 5337 5338 if (CheckIntrinsics) { 5339 // Check if an intrinsic is defined for method 'method', 5340 // but the method is not annotated with @HotSpotIntrinsicCandidate. 5341 if (method->intrinsic_id() != vmIntrinsics::_none && 5342 !method->intrinsic_candidate()) { 5343 tty->print("Compiler intrinsic is defined for method [%s], " 5344 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 5345 method->name_and_sig_as_C_string(), 5346 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 5347 ); 5348 tty->cr(); 5349 DEBUG_ONLY(vm_exit(1)); 5350 } 5351 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 5352 // but there is no intrinsic available for it. 5353 if (method->intrinsic_candidate() && 5354 method->intrinsic_id() == vmIntrinsics::_none) { 5355 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 5356 "but no compiler intrinsic is defined for the method.%s", 5357 method->name_and_sig_as_C_string(), 5358 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5359 ); 5360 tty->cr(); 5361 DEBUG_ONLY(vm_exit(1)); 5362 } 5363 } 5364 } // end for 5365 5366 #ifdef ASSERT 5367 if (CheckIntrinsics) { 5368 // Check for orphan methods in the current class. A method m 5369 // of a class C is orphan if an intrinsic is defined for method m, 5370 // but class C does not declare m. 5371 // The check is potentially expensive, therefore it is available 5372 // only in debug builds. 5373 5374 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; ++id) { 5375 if (vmIntrinsics::_compiledLambdaForm == id) { 5376 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 5377 // generated for the JVM from a LambdaForm and therefore no method 5378 // is defined for it. 5379 continue; 5380 } 5381 5382 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 5383 // Check if the current class contains a method with the same 5384 // name, flags, signature. 5385 bool match = false; 5386 for (int j = 0; j < methods->length(); ++j) { 5387 const Method* method = methods->at(j); 5388 if (method->intrinsic_id() == id) { 5389 match = true; 5390 break; 5391 } 5392 } 5393 5394 if (!match) { 5395 char buf[1000]; 5396 tty->print("Compiler intrinsic is defined for method [%s], " 5397 "but the method is not available in class [%s].%s", 5398 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), 5399 buf, sizeof(buf)), 5400 ik->name()->as_C_string(), 5401 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 5402 ); 5403 tty->cr(); 5404 DEBUG_ONLY(vm_exit(1)); 5405 } 5406 } 5407 } // end for 5408 } // CheckIntrinsics 5409 #endif // ASSERT 5410 } 5411 } 5412 5413 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, TRAPS) { 5414 if (_klass != NULL) { 5415 return _klass; 5416 } 5417 5418 InstanceKlass* const ik = 5419 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); 5420 5421 fill_instance_klass(ik, changed_by_loadhook, CHECK_NULL); 5422 5423 assert(_klass == ik, "invariant"); 5424 5425 ik->set_has_passed_fingerprint_check(false); 5426 if (UseAOT && ik->supers_have_passed_fingerprint_checks()) { 5427 uint64_t aot_fp = AOTLoader::get_saved_fingerprint(ik); 5428 if (aot_fp != 0 && aot_fp == _stream->compute_fingerprint()) { 5429 // This class matches with a class saved in an AOT library 5430 ik->set_has_passed_fingerprint_check(true); 5431 } else { 5432 ResourceMark rm; 5433 log_info(class, fingerprint)("%s : expected = " PTR64_FORMAT " actual = " PTR64_FORMAT, 5434 ik->external_name(), aot_fp, _stream->compute_fingerprint()); 5435 } 5436 } 5437 5438 return ik; 5439 } 5440 5441 void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, TRAPS) { 5442 assert(ik != NULL, "invariant"); 5443 5444 // Set name and CLD before adding to CLD 5445 ik->set_class_loader_data(_loader_data); 5446 ik->set_name(_class_name); 5447 5448 // Add all classes to our internal class loader list here, 5449 // including classes in the bootstrap (NULL) class loader. 5450 const bool publicize = !is_internal(); 5451 5452 _loader_data->add_class(ik, publicize); 5453 5454 set_klass_to_deallocate(ik); 5455 5456 assert(_field_info != NULL, "invariant"); 5457 assert(ik->static_field_size() == _field_info->static_field_size, "sanity"); 5458 assert(ik->nonstatic_oop_map_count() == _field_info->total_oop_map_count, 5459 "sanity"); 5460 5461 assert(ik->is_instance_klass(), "sanity"); 5462 assert(ik->size_helper() == _field_info->instance_size, "sanity"); 5463 5464 // Fill in information already parsed 5465 ik->set_should_verify_class(_need_verify); 5466 5467 // Not yet: supers are done below to support the new subtype-checking fields 5468 ik->set_nonstatic_field_size(_field_info->nonstatic_field_size); 5469 ik->set_has_nonstatic_fields(_field_info->has_nonstatic_fields); 5470 assert(_fac != NULL, "invariant"); 5471 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]); 5472 5473 // this transfers ownership of a lot of arrays from 5474 // the parser onto the InstanceKlass* 5475 apply_parsed_class_metadata(ik, _java_fields_count, CHECK); 5476 5477 // note that is not safe to use the fields in the parser from this point on 5478 assert(NULL == _cp, "invariant"); 5479 assert(NULL == _fields, "invariant"); 5480 assert(NULL == _methods, "invariant"); 5481 assert(NULL == _inner_classes, "invariant"); 5482 assert(NULL == _local_interfaces, "invariant"); 5483 assert(NULL == _combined_annotations, "invariant"); 5484 5485 if (_has_final_method) { 5486 ik->set_has_final_method(); 5487 } 5488 5489 ik->copy_method_ordering(_method_ordering, CHECK); 5490 // The InstanceKlass::_methods_jmethod_ids cache 5491 // is managed on the assumption that the initial cache 5492 // size is equal to the number of methods in the class. If 5493 // that changes, then InstanceKlass::idnum_can_increment() 5494 // has to be changed accordingly. 5495 ik->set_initial_method_idnum(ik->methods()->length()); 5496 5497 ik->set_this_class_index(_this_class_index); 5498 5499 if (is_anonymous()) { 5500 // _this_class_index is a CONSTANT_Class entry that refers to this 5501 // anonymous class itself. If this class needs to refer to its own methods or 5502 // fields, it would use a CONSTANT_MethodRef, etc, which would reference 5503 // _this_class_index. However, because this class is anonymous (it's 5504 // not stored in SystemDictionary), _this_class_index cannot be resolved 5505 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. 5506 // Therefore, we must eagerly resolve _this_class_index now. 5507 ik->constants()->klass_at_put(_this_class_index, ik); 5508 } 5509 5510 ik->set_minor_version(_minor_version); 5511 ik->set_major_version(_major_version); 5512 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); 5513 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); 5514 5515 if (_host_klass != NULL) { 5516 assert (ik->is_anonymous(), "should be the same"); 5517 ik->set_host_klass(_host_klass); 5518 } 5519 5520 // Set PackageEntry for this_klass 5521 oop cl = ik->class_loader(); 5522 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl)); 5523 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); 5524 ik->set_package(cld, CHECK); 5525 5526 const Array<Method*>* const methods = ik->methods(); 5527 assert(methods != NULL, "invariant"); 5528 const int methods_len = methods->length(); 5529 5530 check_methods_for_intrinsics(ik, methods); 5531 5532 // Fill in field values obtained by parse_classfile_attributes 5533 if (_parsed_annotations->has_any_annotations()) { 5534 _parsed_annotations->apply_to(ik); 5535 } 5536 5537 apply_parsed_class_attributes(ik); 5538 5539 // Miranda methods 5540 if ((_num_miranda_methods > 0) || 5541 // if this class introduced new miranda methods or 5542 (_super_klass != NULL && _super_klass->has_miranda_methods()) 5543 // super class exists and this class inherited miranda methods 5544 ) { 5545 ik->set_has_miranda_methods(); // then set a flag 5546 } 5547 5548 // Fill in information needed to compute superclasses. 5549 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK); 5550 ik->set_transitive_interfaces(_transitive_interfaces); 5551 _transitive_interfaces = NULL; 5552 5553 // Initialize itable offset tables 5554 klassItable::setup_itable_offset_table(ik); 5555 5556 // Compute transitive closure of interfaces this class implements 5557 // Do final class setup 5558 fill_oop_maps(ik, 5559 _field_info->nonstatic_oop_map_count, 5560 _field_info->nonstatic_oop_offsets, 5561 _field_info->nonstatic_oop_counts); 5562 5563 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 5564 set_precomputed_flags(ik); 5565 5566 // check if this class can access its super class 5567 check_super_class_access(ik, CHECK); 5568 5569 // check if this class can access its superinterfaces 5570 check_super_interface_access(ik, CHECK); 5571 5572 // check if this class overrides any final method 5573 check_final_method_override(ik, CHECK); 5574 5575 // reject static interface methods prior to Java 8 5576 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { 5577 check_illegal_static_method(ik, CHECK); 5578 } 5579 5580 // Obtain this_klass' module entry 5581 ModuleEntry* module_entry = ik->module(); 5582 assert(module_entry != NULL, "module_entry should always be set"); 5583 5584 // Obtain java.lang.Module 5585 Handle module_handle(THREAD, module_entry->module()); 5586 5587 // Allocate mirror and initialize static fields 5588 // The create_mirror() call will also call compute_modifiers() 5589 java_lang_Class::create_mirror(ik, 5590 Handle(THREAD, _loader_data->class_loader()), 5591 module_handle, 5592 _protection_domain, 5593 CHECK); 5594 5595 assert(_all_mirandas != NULL, "invariant"); 5596 5597 // Generate any default methods - default methods are public interface methods 5598 // that have a default implementation. This is new with Java 8. 5599 if (_has_nonstatic_concrete_methods) { 5600 DefaultMethods::generate_default_methods(ik, 5601 _all_mirandas, 5602 CHECK); 5603 } 5604 5605 // Add read edges to the unnamed modules of the bootstrap and app class loaders. 5606 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && 5607 !module_entry->has_default_read_edges()) { 5608 if (!module_entry->set_has_default_read_edges()) { 5609 // We won a potential race 5610 JvmtiExport::add_default_read_edges(module_handle, THREAD); 5611 } 5612 } 5613 5614 // Update the loader_data graph. 5615 record_defined_class_dependencies(ik, CHECK); 5616 5617 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); 5618 5619 if (!is_internal()) { 5620 if (log_is_enabled(Info, class, load)) { 5621 ResourceMark rm; 5622 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 5623 ik->print_class_load_logging(_loader_data, module_name, _stream); 5624 } 5625 5626 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && 5627 ik->major_version() != JAVA_MIN_SUPPORTED_VERSION && 5628 log_is_enabled(Info, class, preview)) { 5629 ResourceMark rm; 5630 log_info(class, preview)("Loading preview feature type %s", ik->external_name()); 5631 } 5632 5633 if (log_is_enabled(Debug, class, resolve)) { 5634 ResourceMark rm; 5635 // print out the superclass. 5636 const char * from = ik->external_name(); 5637 if (ik->java_super() != NULL) { 5638 log_debug(class, resolve)("%s %s (super)", 5639 from, 5640 ik->java_super()->external_name()); 5641 } 5642 // print out each of the interface classes referred to by this class. 5643 const Array<Klass*>* const local_interfaces = ik->local_interfaces(); 5644 if (local_interfaces != NULL) { 5645 const int length = local_interfaces->length(); 5646 for (int i = 0; i < length; i++) { 5647 const Klass* const k = local_interfaces->at(i); 5648 const char * to = k->external_name(); 5649 log_debug(class, resolve)("%s %s (interface)", from, to); 5650 } 5651 } 5652 } 5653 } 5654 5655 JFR_ONLY(INIT_ID(ik);) 5656 5657 // If we reach here, all is well. 5658 // Now remove the InstanceKlass* from the _klass_to_deallocate field 5659 // in order for it to not be destroyed in the ClassFileParser destructor. 5660 set_klass_to_deallocate(NULL); 5661 5662 // it's official 5663 set_klass(ik); 5664 5665 debug_only(ik->verify();) 5666 } 5667 5668 // For an anonymous class that is in the unnamed package, move it to its host class's 5669 // package by prepending its host class's package name to its class name and setting 5670 // its _class_name field. 5671 void ClassFileParser::prepend_host_package_name(const InstanceKlass* host_klass, TRAPS) { 5672 ResourceMark rm(THREAD); 5673 assert(strrchr(_class_name->as_C_string(), '/') == NULL, 5674 "Anonymous class should not be in a package"); 5675 const char* host_pkg_name = 5676 ClassLoader::package_from_name(host_klass->name()->as_C_string(), NULL); 5677 5678 if (host_pkg_name != NULL) { 5679 size_t host_pkg_len = strlen(host_pkg_name); 5680 int class_name_len = _class_name->utf8_length(); 5681 char* new_anon_name = 5682 NEW_RESOURCE_ARRAY(char, host_pkg_len + 1 + class_name_len); 5683 // Copy host package name and trailing /. 5684 strncpy(new_anon_name, host_pkg_name, host_pkg_len); 5685 new_anon_name[host_pkg_len] = '/'; 5686 // Append anonymous class name. The anonymous class name can contain odd 5687 // characters. So, do a strncpy instead of using sprintf("%s..."). 5688 strncpy(new_anon_name + host_pkg_len + 1, (char *)_class_name->base(), class_name_len); 5689 5690 // Create a symbol and update the anonymous class name. 5691 _class_name = SymbolTable::new_symbol(new_anon_name, 5692 (int)host_pkg_len + 1 + class_name_len, 5693 CHECK); 5694 } 5695 } 5696 5697 // If the host class and the anonymous class are in the same package then do 5698 // nothing. If the anonymous class is in the unnamed package then move it to its 5699 // host's package. If the classes are in different packages then throw an IAE 5700 // exception. 5701 void ClassFileParser::fix_anonymous_class_name(TRAPS) { 5702 assert(_host_klass != NULL, "Expected an anonymous class"); 5703 5704 const jbyte* anon_last_slash = UTF8::strrchr(_class_name->base(), 5705 _class_name->utf8_length(), '/'); 5706 if (anon_last_slash == NULL) { // Unnamed package 5707 prepend_host_package_name(_host_klass, CHECK); 5708 } else { 5709 if (!_host_klass->is_same_class_package(_host_klass->class_loader(), _class_name)) { 5710 ResourceMark rm(THREAD); 5711 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 5712 err_msg("Host class %s and anonymous class %s are in different packages", 5713 _host_klass->name()->as_C_string(), _class_name->as_C_string())); 5714 } 5715 } 5716 } 5717 5718 static bool relax_format_check_for(ClassLoaderData* loader_data) { 5719 bool trusted = (loader_data->is_the_null_class_loader_data() || 5720 SystemDictionary::is_platform_class_loader(loader_data->class_loader())); 5721 bool need_verify = 5722 // verifyAll 5723 (BytecodeVerificationLocal && BytecodeVerificationRemote) || 5724 // verifyRemote 5725 (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted); 5726 return !need_verify; 5727 } 5728 5729 ClassFileParser::ClassFileParser(ClassFileStream* stream, 5730 Symbol* name, 5731 ClassLoaderData* loader_data, 5732 Handle protection_domain, 5733 const InstanceKlass* host_klass, 5734 GrowableArray<Handle>* cp_patches, 5735 Publicity pub_level, 5736 TRAPS) : 5737 _stream(stream), 5738 _requested_name(name), 5739 _loader_data(loader_data), 5740 _host_klass(host_klass), 5741 _cp_patches(cp_patches), 5742 _num_patched_klasses(0), 5743 _max_num_patched_klasses(0), 5744 _orig_cp_size(0), 5745 _first_patched_klass_resolved_index(0), 5746 _super_klass(), 5747 _cp(NULL), 5748 _fields(NULL), 5749 _methods(NULL), 5750 _inner_classes(NULL), 5751 _local_interfaces(NULL), 5752 _transitive_interfaces(NULL), 5753 _combined_annotations(NULL), 5754 _annotations(NULL), 5755 _type_annotations(NULL), 5756 _fields_annotations(NULL), 5757 _fields_type_annotations(NULL), 5758 _klass(NULL), 5759 _klass_to_deallocate(NULL), 5760 _parsed_annotations(NULL), 5761 _fac(NULL), 5762 _field_info(NULL), 5763 _method_ordering(NULL), 5764 _all_mirandas(NULL), 5765 _vtable_size(0), 5766 _itable_size(0), 5767 _num_miranda_methods(0), 5768 _rt(REF_NONE), 5769 _protection_domain(protection_domain), 5770 _access_flags(), 5771 _pub_level(pub_level), 5772 _bad_constant_seen(0), 5773 _synthetic_flag(false), 5774 _sde_length(false), 5775 _sde_buffer(NULL), 5776 _sourcefile_index(0), 5777 _generic_signature_index(0), 5778 _major_version(0), 5779 _minor_version(0), 5780 _this_class_index(0), 5781 _super_class_index(0), 5782 _itfs_len(0), 5783 _java_fields_count(0), 5784 _need_verify(false), 5785 _relax_verify(false), 5786 _has_nonstatic_concrete_methods(false), 5787 _declares_nonstatic_concrete_methods(false), 5788 _has_final_method(false), 5789 _has_finalizer(false), 5790 _has_empty_finalizer(false), 5791 _has_vanilla_constructor(false), 5792 _max_bootstrap_specifier_index(-1) { 5793 5794 _class_name = name != NULL ? name : vmSymbols::unknown_class_name(); 5795 5796 assert(THREAD->is_Java_thread(), "invariant"); 5797 assert(_loader_data != NULL, "invariant"); 5798 assert(stream != NULL, "invariant"); 5799 assert(_stream != NULL, "invariant"); 5800 assert(_stream->buffer() == _stream->current(), "invariant"); 5801 assert(_class_name != NULL, "invariant"); 5802 assert(0 == _access_flags.as_int(), "invariant"); 5803 5804 // Figure out whether we can skip format checking (matching classic VM behavior) 5805 if (DumpSharedSpaces) { 5806 // verify == true means it's a 'remote' class (i.e., non-boot class) 5807 // Verification decision is based on BytecodeVerificationRemote flag 5808 // for those classes. 5809 _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote : 5810 BytecodeVerificationLocal; 5811 } 5812 else { 5813 _need_verify = Verifier::should_verify_for(_loader_data->class_loader(), 5814 stream->need_verify()); 5815 } 5816 if (_cp_patches != NULL) { 5817 int len = _cp_patches->length(); 5818 for (int i=0; i<len; i++) { 5819 if (has_cp_patch_at(i)) { 5820 Handle patch = cp_patch_at(i); 5821 if (java_lang_String::is_instance(patch()) || java_lang_Class::is_instance(patch())) { 5822 // We need to append the names of the patched classes to the end of the constant pool, 5823 // because a patched class may have a Utf8 name that's not already included in the 5824 // original constant pool. These class names are used when patch_constant_pool() 5825 // calls patch_class(). 5826 // 5827 // Note that a String in cp_patch_at(i) may be used to patch a Utf8, a String, or a Class. 5828 // At this point, we don't know the tag for index i yet, because we haven't parsed the 5829 // constant pool. So we can only assume the worst -- every String is used to patch a Class. 5830 _max_num_patched_klasses++; 5831 } 5832 } 5833 } 5834 } 5835 5836 // synch back verification state to stream 5837 stream->set_verify(_need_verify); 5838 5839 // Check if verification needs to be relaxed for this class file 5840 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 5841 _relax_verify = relax_format_check_for(_loader_data); 5842 5843 parse_stream(stream, CHECK); 5844 5845 post_process_parsed_stream(stream, _cp, CHECK); 5846 } 5847 5848 void ClassFileParser::clear_class_metadata() { 5849 // metadata created before the instance klass is created. Must be 5850 // deallocated if classfile parsing returns an error. 5851 _cp = NULL; 5852 _fields = NULL; 5853 _methods = NULL; 5854 _inner_classes = NULL; 5855 _local_interfaces = NULL; 5856 _combined_annotations = NULL; 5857 _annotations = _type_annotations = NULL; 5858 _fields_annotations = _fields_type_annotations = NULL; 5859 } 5860 5861 // Destructor to clean up 5862 ClassFileParser::~ClassFileParser() { 5863 if (_cp != NULL) { 5864 MetadataFactory::free_metadata(_loader_data, _cp); 5865 } 5866 if (_fields != NULL) { 5867 MetadataFactory::free_array<u2>(_loader_data, _fields); 5868 } 5869 5870 if (_methods != NULL) { 5871 // Free methods 5872 InstanceKlass::deallocate_methods(_loader_data, _methods); 5873 } 5874 5875 // beware of the Universe::empty_blah_array!! 5876 if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) { 5877 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 5878 } 5879 5880 // Free interfaces 5881 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, 5882 _local_interfaces, _transitive_interfaces); 5883 5884 if (_combined_annotations != NULL) { 5885 // After all annotations arrays have been created, they are installed into the 5886 // Annotations object that will be assigned to the InstanceKlass being created. 5887 5888 // Deallocate the Annotations object and the installed annotations arrays. 5889 _combined_annotations->deallocate_contents(_loader_data); 5890 5891 // If the _combined_annotations pointer is non-NULL, 5892 // then the other annotations fields should have been cleared. 5893 assert(_annotations == NULL, "Should have been cleared"); 5894 assert(_type_annotations == NULL, "Should have been cleared"); 5895 assert(_fields_annotations == NULL, "Should have been cleared"); 5896 assert(_fields_type_annotations == NULL, "Should have been cleared"); 5897 } else { 5898 // If the annotations arrays were not installed into the Annotations object, 5899 // then they have to be deallocated explicitly. 5900 MetadataFactory::free_array<u1>(_loader_data, _annotations); 5901 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 5902 Annotations::free_contents(_loader_data, _fields_annotations); 5903 Annotations::free_contents(_loader_data, _fields_type_annotations); 5904 } 5905 5906 clear_class_metadata(); 5907 _transitive_interfaces = NULL; 5908 5909 // deallocate the klass if already created. Don't directly deallocate, but add 5910 // to the deallocate list so that the klass is removed from the CLD::_klasses list 5911 // at a safepoint. 5912 if (_klass_to_deallocate != NULL) { 5913 _loader_data->add_to_deallocate_list(_klass_to_deallocate); 5914 } 5915 } 5916 5917 void ClassFileParser::parse_stream(const ClassFileStream* const stream, 5918 TRAPS) { 5919 5920 assert(stream != NULL, "invariant"); 5921 assert(_class_name != NULL, "invariant"); 5922 5923 // BEGIN STREAM PARSING 5924 stream->guarantee_more(8, CHECK); // magic, major, minor 5925 // Magic value 5926 const u4 magic = stream->get_u4_fast(); 5927 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 5928 "Incompatible magic value %u in class file %s", 5929 magic, CHECK); 5930 5931 // Version numbers 5932 _minor_version = stream->get_u2_fast(); 5933 _major_version = stream->get_u2_fast(); 5934 5935 if (DumpSharedSpaces && _major_version < JAVA_1_5_VERSION) { 5936 ResourceMark rm; 5937 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 5938 _major_version, _minor_version, _class_name->as_C_string()); 5939 Exceptions::fthrow( 5940 THREAD_AND_LOCATION, 5941 vmSymbols::java_lang_UnsupportedClassVersionError(), 5942 "Unsupported major.minor version for dump time %u.%u", 5943 _major_version, 5944 _minor_version); 5945 } 5946 5947 // Check version numbers - we check this even with verifier off 5948 verify_class_version(_major_version, _minor_version, _class_name, CHECK); 5949 5950 stream->guarantee_more(3, CHECK); // length, first cp tag 5951 u2 cp_size = stream->get_u2_fast(); 5952 5953 guarantee_property( 5954 cp_size >= 1, "Illegal constant pool size %u in class file %s", 5955 cp_size, CHECK); 5956 5957 _orig_cp_size = cp_size; 5958 if (int(cp_size) + _max_num_patched_klasses > 0xffff) { 5959 THROW_MSG(vmSymbols::java_lang_InternalError(), "not enough space for patched classes"); 5960 } 5961 cp_size += _max_num_patched_klasses; 5962 5963 _cp = ConstantPool::allocate(_loader_data, 5964 cp_size, 5965 CHECK); 5966 5967 ConstantPool* const cp = _cp; 5968 5969 parse_constant_pool(stream, cp, _orig_cp_size, CHECK); 5970 5971 assert(cp_size == (const u2)cp->length(), "invariant"); 5972 5973 // ACCESS FLAGS 5974 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len 5975 5976 // Access flags 5977 jint flags; 5978 // JVM_ACC_MODULE is defined in JDK-9 and later. 5979 if (_major_version >= JAVA_9_VERSION) { 5980 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); 5981 } else { 5982 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 5983 } 5984 5985 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 5986 // Set abstract bit for old class files for backward compatibility 5987 flags |= JVM_ACC_ABSTRACT; 5988 } 5989 5990 verify_legal_class_modifiers(flags, CHECK); 5991 5992 short bad_constant = class_bad_constant_seen(); 5993 if (bad_constant != 0) { 5994 // Do not throw CFE until after the access_flags are checked because if 5995 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. 5996 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, CHECK); 5997 } 5998 5999 _access_flags.set_flags(flags); 6000 6001 // This class and superclass 6002 _this_class_index = stream->get_u2_fast(); 6003 check_property( 6004 valid_cp_range(_this_class_index, cp_size) && 6005 cp->tag_at(_this_class_index).is_unresolved_klass(), 6006 "Invalid this class index %u in constant pool in class file %s", 6007 _this_class_index, CHECK); 6008 6009 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); 6010 assert(class_name_in_cp != NULL, "class_name can't be null"); 6011 6012 // Update _class_name which could be null previously 6013 // to reflect the name in the constant pool 6014 _class_name = class_name_in_cp; 6015 6016 // Don't need to check whether this class name is legal or not. 6017 // It has been checked when constant pool is parsed. 6018 // However, make sure it is not an array type. 6019 if (_need_verify) { 6020 guarantee_property(_class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 6021 "Bad class name in class file %s", 6022 CHECK); 6023 } 6024 6025 // Checks if name in class file matches requested name 6026 if (_requested_name != NULL && _requested_name != _class_name) { 6027 ResourceMark rm(THREAD); 6028 Exceptions::fthrow( 6029 THREAD_AND_LOCATION, 6030 vmSymbols::java_lang_NoClassDefFoundError(), 6031 "%s (wrong name: %s)", 6032 _class_name->as_C_string(), 6033 _requested_name != NULL ? _requested_name->as_C_string() : "NoName" 6034 ); 6035 return; 6036 } 6037 6038 // if this is an anonymous class fix up its name if it's in the unnamed 6039 // package. Otherwise, throw IAE if it is in a different package than 6040 // its host class. 6041 if (_host_klass != NULL) { 6042 fix_anonymous_class_name(CHECK); 6043 } 6044 6045 // Verification prevents us from creating names with dots in them, this 6046 // asserts that that's the case. 6047 assert(is_internal_format(_class_name), "external class name format used internally"); 6048 6049 if (!is_internal()) { 6050 LogTarget(Debug, class, preorder) lt; 6051 if (lt.is_enabled()){ 6052 ResourceMark rm(THREAD); 6053 LogStream ls(lt); 6054 ls.print("%s", _class_name->as_klass_external_name()); 6055 if (stream->source() != NULL) { 6056 ls.print(" source: %s", stream->source()); 6057 } 6058 ls.cr(); 6059 } 6060 6061 #if INCLUDE_CDS 6062 if (DumpLoadedClassList != NULL && stream->source() != NULL && classlist_file->is_open()) { 6063 if (!ClassLoader::has_jrt_entry()) { 6064 warning("DumpLoadedClassList and CDS are not supported in exploded build"); 6065 DumpLoadedClassList = NULL; 6066 } else if (SystemDictionaryShared::is_sharing_possible(_loader_data) && 6067 _host_klass == NULL) { 6068 // Only dump the classes that can be stored into CDS archive. 6069 // Anonymous classes such as generated LambdaForm classes are also not included. 6070 oop class_loader = _loader_data->class_loader(); 6071 ResourceMark rm(THREAD); 6072 bool skip = false; 6073 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) { 6074 // For the boot and platform class loaders, skip classes that are not found in the 6075 // java runtime image, such as those found in the --patch-module entries. 6076 // These classes can't be loaded from the archive during runtime. 6077 if (!ClassLoader::is_modules_image(stream->source()) && strncmp(stream->source(), "jrt:", 4) != 0) { 6078 skip = true; 6079 } 6080 6081 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) { 6082 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a 6083 // as they can be loaded from the archive during runtime. 6084 skip = false; 6085 } 6086 } 6087 if (skip) { 6088 tty->print_cr("skip writing class %s from source %s to classlist file", 6089 _class_name->as_C_string(), stream->source()); 6090 } else { 6091 classlist_file->print_cr("%s", _class_name->as_C_string()); 6092 classlist_file->flush(); 6093 } 6094 } 6095 } 6096 #endif 6097 } 6098 6099 // SUPERKLASS 6100 _super_class_index = stream->get_u2_fast(); 6101 _super_klass = parse_super_class(cp, 6102 _super_class_index, 6103 _need_verify, 6104 CHECK); 6105 6106 // Interfaces 6107 _itfs_len = stream->get_u2_fast(); 6108 parse_interfaces(stream, 6109 _itfs_len, 6110 cp, 6111 &_has_nonstatic_concrete_methods, 6112 CHECK); 6113 6114 assert(_local_interfaces != NULL, "invariant"); 6115 6116 // Fields (offsets are filled in later) 6117 _fac = new FieldAllocationCount(); 6118 parse_fields(stream, 6119 _access_flags.is_interface(), 6120 _fac, 6121 cp, 6122 cp_size, 6123 &_java_fields_count, 6124 CHECK); 6125 6126 assert(_fields != NULL, "invariant"); 6127 6128 // Methods 6129 AccessFlags promoted_flags; 6130 parse_methods(stream, 6131 _access_flags.is_interface(), 6132 &promoted_flags, 6133 &_has_final_method, 6134 &_declares_nonstatic_concrete_methods, 6135 CHECK); 6136 6137 assert(_methods != NULL, "invariant"); 6138 6139 // promote flags from parse_methods() to the klass' flags 6140 _access_flags.add_promoted_flags(promoted_flags.as_int()); 6141 6142 if (_declares_nonstatic_concrete_methods) { 6143 _has_nonstatic_concrete_methods = true; 6144 } 6145 6146 // Additional attributes/annotations 6147 _parsed_annotations = new ClassAnnotationCollector(); 6148 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); 6149 6150 assert(_inner_classes != NULL, "invariant"); 6151 6152 // Finalize the Annotations metadata object, 6153 // now that all annotation arrays have been created. 6154 create_combined_annotations(CHECK); 6155 6156 // Make sure this is the end of class file stream 6157 guarantee_property(stream->at_eos(), 6158 "Extra bytes at the end of class file %s", 6159 CHECK); 6160 6161 // all bytes in stream read and parsed 6162 } 6163 6164 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, 6165 ConstantPool* cp, 6166 TRAPS) { 6167 assert(stream != NULL, "invariant"); 6168 assert(stream->at_eos(), "invariant"); 6169 assert(cp != NULL, "invariant"); 6170 assert(_loader_data != NULL, "invariant"); 6171 6172 if (_class_name == vmSymbols::java_lang_Object()) { 6173 check_property(_local_interfaces == Universe::the_empty_klass_array(), 6174 "java.lang.Object cannot implement an interface in class file %s", 6175 CHECK); 6176 } 6177 // We check super class after class file is parsed and format is checked 6178 if (_super_class_index > 0 && NULL ==_super_klass) { 6179 Symbol* const super_class_name = cp->klass_name_at(_super_class_index); 6180 if (_access_flags.is_interface()) { 6181 // Before attempting to resolve the superclass, check for class format 6182 // errors not checked yet. 6183 guarantee_property(super_class_name == vmSymbols::java_lang_Object(), 6184 "Interfaces must have java.lang.Object as superclass in class file %s", 6185 CHECK); 6186 } 6187 Handle loader(THREAD, _loader_data->class_loader()); 6188 _super_klass = (const InstanceKlass*) 6189 SystemDictionary::resolve_super_or_fail(_class_name, 6190 super_class_name, 6191 loader, 6192 _protection_domain, 6193 true, 6194 CHECK); 6195 } 6196 6197 if (_super_klass != NULL) { 6198 if (_super_klass->has_nonstatic_concrete_methods()) { 6199 _has_nonstatic_concrete_methods = true; 6200 } 6201 6202 if (_super_klass->is_interface()) { 6203 ResourceMark rm(THREAD); 6204 Exceptions::fthrow( 6205 THREAD_AND_LOCATION, 6206 vmSymbols::java_lang_IncompatibleClassChangeError(), 6207 "class %s has interface %s as super class", 6208 _class_name->as_klass_external_name(), 6209 _super_klass->external_name() 6210 ); 6211 return; 6212 } 6213 // Make sure super class is not final 6214 if (_super_klass->is_final()) { 6215 THROW_MSG(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class"); 6216 } 6217 } 6218 6219 // Compute the transitive list of all unique interfaces implemented by this class 6220 _transitive_interfaces = 6221 compute_transitive_interfaces(_super_klass, 6222 _local_interfaces, 6223 _loader_data, 6224 CHECK); 6225 6226 assert(_transitive_interfaces != NULL, "invariant"); 6227 6228 // sort methods 6229 _method_ordering = sort_methods(_methods); 6230 6231 _all_mirandas = new GrowableArray<Method*>(20); 6232 6233 Handle loader(THREAD, _loader_data->class_loader()); 6234 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, 6235 &_num_miranda_methods, 6236 _all_mirandas, 6237 _super_klass, 6238 _methods, 6239 _access_flags, 6240 _major_version, 6241 loader, 6242 _class_name, 6243 _local_interfaces, 6244 CHECK); 6245 6246 // Size of Java itable (in words) 6247 _itable_size = _access_flags.is_interface() ? 0 : 6248 klassItable::compute_itable_size(_transitive_interfaces); 6249 6250 assert(_fac != NULL, "invariant"); 6251 assert(_parsed_annotations != NULL, "invariant"); 6252 6253 _field_info = new FieldLayoutInfo(); 6254 layout_fields(cp, _fac, _parsed_annotations, _field_info, CHECK); 6255 6256 // Compute reference typ 6257 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type(); 6258 6259 } 6260 6261 void ClassFileParser::set_klass(InstanceKlass* klass) { 6262 6263 #ifdef ASSERT 6264 if (klass != NULL) { 6265 assert(NULL == _klass, "leaking?"); 6266 } 6267 #endif 6268 6269 _klass = klass; 6270 } 6271 6272 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 6273 6274 #ifdef ASSERT 6275 if (klass != NULL) { 6276 assert(NULL == _klass_to_deallocate, "leaking?"); 6277 } 6278 #endif 6279 6280 _klass_to_deallocate = klass; 6281 } 6282 6283 // Caller responsible for ResourceMark 6284 // clone stream with rewound position 6285 const ClassFileStream* ClassFileParser::clone_stream() const { 6286 assert(_stream != NULL, "invariant"); 6287 6288 return _stream->clone(); 6289 } 6290 // ---------------------------------------------------------------------------- 6291 // debugging 6292 6293 #ifdef ASSERT 6294 6295 // return true if class_name contains no '.' (internal format is '/') 6296 bool ClassFileParser::is_internal_format(Symbol* class_name) { 6297 if (class_name != NULL) { 6298 ResourceMark rm; 6299 char* name = class_name->as_C_string(); 6300 return strchr(name, '.') == NULL; 6301 } else { 6302 return true; 6303 } 6304 } 6305 6306 #endif