1 /* 2 * Copyright (c) 1997, 2015, 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 25 #include "precompiled.hpp" 26 #include "classfile/classFileParser.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.inline.hpp" 29 #include "classfile/defaultMethods.hpp" 30 #include "classfile/javaClasses.inline.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/verificationType.hpp" 34 #include "classfile/verifier.hpp" 35 #include "classfile/vmSymbols.hpp" 36 #include "gc/shared/gcLocker.hpp" 37 #include "memory/allocation.hpp" 38 #include "memory/metadataFactory.hpp" 39 #include "memory/oopFactory.hpp" 40 #include "memory/referenceType.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "memory/universe.inline.hpp" 43 #include "oops/constantPool.hpp" 44 #include "oops/fieldStreams.hpp" 45 #include "oops/instanceKlass.hpp" 46 #include "oops/instanceMirrorKlass.hpp" 47 #include "oops/klass.inline.hpp" 48 #include "oops/klassVtable.hpp" 49 #include "oops/method.hpp" 50 #include "oops/symbol.hpp" 51 #include "prims/jvm.h" 52 #include "prims/jvmtiExport.hpp" 53 #include "prims/jvmtiThreadState.hpp" 54 #include "runtime/javaCalls.hpp" 55 #include "runtime/perfData.hpp" 56 #include "runtime/reflection.hpp" 57 #include "runtime/signature.hpp" 58 #include "runtime/timer.hpp" 59 #include "services/classLoadingService.hpp" 60 #include "services/threadService.hpp" 61 #include "utilities/array.hpp" 62 #include "utilities/exceptions.hpp" 63 #include "utilities/globalDefinitions.hpp" 64 #include "utilities/macros.hpp" 65 #include "utilities/ostream.hpp" 66 #include "utilities/resourceHash.hpp" 67 #if INCLUDE_CDS 68 #include "classfile/systemDictionaryShared.hpp" 69 #endif 70 71 // We generally try to create the oops directly when parsing, rather than 72 // allocating temporary data structures and copying the bytes twice. A 73 // temporary area is only needed when parsing utf8 entries in the constant 74 // pool and when parsing line number tables. 75 76 // We add assert in debug mode when class format is not checked. 77 78 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 79 #define JAVA_MIN_SUPPORTED_VERSION 45 80 #define JAVA_MAX_SUPPORTED_VERSION 52 81 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 82 83 // Used for two backward compatibility reasons: 84 // - to check for new additions to the class file format in JDK1.5 85 // - to check for bug fixes in the format checker in JDK1.5 86 #define JAVA_1_5_VERSION 49 87 88 // Used for backward compatibility reasons: 89 // - to check for javac bug fixes that happened after 1.5 90 // - also used as the max version when running in jdk6 91 #define JAVA_6_VERSION 50 92 93 // Used for backward compatibility reasons: 94 // - to check NameAndType_info signatures more aggressively 95 // - to disallow argument and require ACC_STATIC for <clinit> methods 96 #define JAVA_7_VERSION 51 97 98 // Extension method support. 99 #define JAVA_8_VERSION 52 100 101 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 102 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 103 // this function (_current can be allocated in a register, with scalar 104 // replacement of aggregates). The _current pointer is copied back to 105 // stream() when this function returns. DON'T call another method within 106 // this method that uses stream(). 107 ClassFileStream* cfs0 = stream(); 108 ClassFileStream cfs1 = *cfs0; 109 ClassFileStream* cfs = &cfs1; 110 #ifdef ASSERT 111 assert(cfs->allocated_on_stack(),"should be local"); 112 u1* old_current = cfs0->current(); 113 #endif 114 Handle class_loader(THREAD, _loader_data->class_loader()); 115 116 // Used for batching symbol allocations. 117 const char* names[SymbolTable::symbol_alloc_batch_size]; 118 int lengths[SymbolTable::symbol_alloc_batch_size]; 119 int indices[SymbolTable::symbol_alloc_batch_size]; 120 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 121 int names_count = 0; 122 123 // parsing Index 0 is unused 124 for (int index = 1; index < length; index++) { 125 // Each of the following case guarantees one more byte in the stream 126 // for the following tag or the access_flags following constant pool, 127 // so we don't need bounds-check for reading tag. 128 u1 tag = cfs->get_u1_fast(); 129 switch (tag) { 130 case JVM_CONSTANT_Class : 131 { 132 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 133 u2 name_index = cfs->get_u2_fast(); 134 _cp->klass_index_at_put(index, name_index); 135 } 136 break; 137 case JVM_CONSTANT_Fieldref : 138 { 139 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 140 u2 class_index = cfs->get_u2_fast(); 141 u2 name_and_type_index = cfs->get_u2_fast(); 142 _cp->field_at_put(index, class_index, name_and_type_index); 143 } 144 break; 145 case JVM_CONSTANT_Methodref : 146 { 147 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 148 u2 class_index = cfs->get_u2_fast(); 149 u2 name_and_type_index = cfs->get_u2_fast(); 150 _cp->method_at_put(index, class_index, name_and_type_index); 151 } 152 break; 153 case JVM_CONSTANT_InterfaceMethodref : 154 { 155 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 156 u2 class_index = cfs->get_u2_fast(); 157 u2 name_and_type_index = cfs->get_u2_fast(); 158 _cp->interface_method_at_put(index, class_index, name_and_type_index); 159 } 160 break; 161 case JVM_CONSTANT_String : 162 { 163 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 164 u2 string_index = cfs->get_u2_fast(); 165 _cp->string_index_at_put(index, string_index); 166 } 167 break; 168 case JVM_CONSTANT_MethodHandle : 169 case JVM_CONSTANT_MethodType : 170 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 171 classfile_parse_error( 172 "Class file version does not support constant tag %u in class file %s", 173 tag, CHECK); 174 } 175 if (tag == JVM_CONSTANT_MethodHandle) { 176 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 177 u1 ref_kind = cfs->get_u1_fast(); 178 u2 method_index = cfs->get_u2_fast(); 179 _cp->method_handle_index_at_put(index, ref_kind, method_index); 180 } else if (tag == JVM_CONSTANT_MethodType) { 181 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 182 u2 signature_index = cfs->get_u2_fast(); 183 _cp->method_type_index_at_put(index, signature_index); 184 } else { 185 ShouldNotReachHere(); 186 } 187 break; 188 case JVM_CONSTANT_InvokeDynamic : 189 { 190 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 191 classfile_parse_error( 192 "Class file version does not support constant tag %u in class file %s", 193 tag, CHECK); 194 } 195 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 196 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 197 u2 name_and_type_index = cfs->get_u2_fast(); 198 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 199 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 200 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 201 } 202 break; 203 case JVM_CONSTANT_Integer : 204 { 205 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 206 u4 bytes = cfs->get_u4_fast(); 207 _cp->int_at_put(index, (jint) bytes); 208 } 209 break; 210 case JVM_CONSTANT_Float : 211 { 212 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 213 u4 bytes = cfs->get_u4_fast(); 214 _cp->float_at_put(index, *(jfloat*)&bytes); 215 } 216 break; 217 case JVM_CONSTANT_Long : 218 // A mangled type might cause you to overrun allocated memory 219 guarantee_property(index+1 < length, 220 "Invalid constant pool entry %u in class file %s", 221 index, CHECK); 222 { 223 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 224 u8 bytes = cfs->get_u8_fast(); 225 _cp->long_at_put(index, bytes); 226 } 227 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 228 break; 229 case JVM_CONSTANT_Double : 230 // A mangled type might cause you to overrun allocated memory 231 guarantee_property(index+1 < length, 232 "Invalid constant pool entry %u in class file %s", 233 index, CHECK); 234 { 235 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 236 u8 bytes = cfs->get_u8_fast(); 237 _cp->double_at_put(index, *(jdouble*)&bytes); 238 } 239 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 240 break; 241 case JVM_CONSTANT_NameAndType : 242 { 243 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 244 u2 name_index = cfs->get_u2_fast(); 245 u2 signature_index = cfs->get_u2_fast(); 246 _cp->name_and_type_at_put(index, name_index, signature_index); 247 } 248 break; 249 case JVM_CONSTANT_Utf8 : 250 { 251 cfs->guarantee_more(2, CHECK); // utf8_length 252 u2 utf8_length = cfs->get_u2_fast(); 253 u1* utf8_buffer = cfs->get_u1_buffer(); 254 assert(utf8_buffer != NULL, "null utf8 buffer"); 255 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 256 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 257 cfs->skip_u1_fast(utf8_length); 258 259 // Before storing the symbol, make sure it's legal 260 if (_need_verify) { 261 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 262 } 263 264 if (has_cp_patch_at(index)) { 265 Handle patch = clear_cp_patch_at(index); 266 guarantee_property(java_lang_String::is_instance(patch()), 267 "Illegal utf8 patch at %d in class file %s", 268 index, CHECK); 269 char* str = java_lang_String::as_utf8_string(patch()); 270 // (could use java_lang_String::as_symbol instead, but might as well batch them) 271 utf8_buffer = (u1*) str; 272 utf8_length = (int) strlen(str); 273 } 274 275 unsigned int hash; 276 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 277 if (result == NULL) { 278 names[names_count] = (char*)utf8_buffer; 279 lengths[names_count] = utf8_length; 280 indices[names_count] = index; 281 hashValues[names_count++] = hash; 282 if (names_count == SymbolTable::symbol_alloc_batch_size) { 283 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 284 names_count = 0; 285 } 286 } else { 287 _cp->symbol_at_put(index, result); 288 } 289 } 290 break; 291 default: 292 classfile_parse_error( 293 "Unknown constant tag %u in class file %s", tag, CHECK); 294 break; 295 } 296 } 297 298 // Allocate the remaining symbols 299 if (names_count > 0) { 300 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 301 } 302 303 // Copy _current pointer of local copy back to stream(). 304 #ifdef ASSERT 305 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 306 #endif 307 cfs0->set_current(cfs1.current()); 308 } 309 310 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 311 312 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 313 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 314 return cp->symbol_at(index); 315 else 316 return NULL; 317 } 318 319 #ifdef ASSERT 320 PRAGMA_DIAG_PUSH 321 PRAGMA_FORMAT_NONLITERAL_IGNORED 322 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) { 323 ResourceMark rm(THREAD); 324 fatal(msg, _class_name->as_C_string()); 325 } 326 327 void ClassFileParser::report_assert_property_failure(const char* msg, int index, TRAPS) { 328 ResourceMark rm(THREAD); 329 fatal(msg, index, _class_name->as_C_string()); 330 } 331 PRAGMA_DIAG_POP 332 #endif 333 334 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 335 ClassFileStream* cfs = stream(); 336 constantPoolHandle nullHandle; 337 338 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 339 u2 length = cfs->get_u2_fast(); 340 guarantee_property( 341 length >= 1, "Illegal constant pool size %u in class file %s", 342 length, CHECK_(nullHandle)); 343 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 344 CHECK_(nullHandle)); 345 _cp = constant_pool; // save in case of errors 346 constantPoolHandle cp (THREAD, constant_pool); 347 348 // parsing constant pool entries 349 parse_constant_pool_entries(length, CHECK_(nullHandle)); 350 351 int index = 1; // declared outside of loops for portability 352 353 // first verification pass - validate cross references and fixup class and string constants 354 for (index = 1; index < length; index++) { // Index 0 is unused 355 jbyte tag = cp->tag_at(index).value(); 356 switch (tag) { 357 case JVM_CONSTANT_Class : 358 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 359 break; 360 case JVM_CONSTANT_Fieldref : 361 // fall through 362 case JVM_CONSTANT_Methodref : 363 // fall through 364 case JVM_CONSTANT_InterfaceMethodref : { 365 if (!_need_verify) break; 366 int klass_ref_index = cp->klass_ref_index_at(index); 367 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 368 check_property(valid_klass_reference_at(klass_ref_index), 369 "Invalid constant pool index %u in class file %s", 370 klass_ref_index, 371 CHECK_(nullHandle)); 372 check_property(valid_cp_range(name_and_type_ref_index, length) && 373 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 374 "Invalid constant pool index %u in class file %s", 375 name_and_type_ref_index, 376 CHECK_(nullHandle)); 377 break; 378 } 379 case JVM_CONSTANT_String : 380 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 381 break; 382 case JVM_CONSTANT_Integer : 383 break; 384 case JVM_CONSTANT_Float : 385 break; 386 case JVM_CONSTANT_Long : 387 case JVM_CONSTANT_Double : 388 index++; 389 check_property( 390 (index < length && cp->tag_at(index).is_invalid()), 391 "Improper constant pool long/double index %u in class file %s", 392 index, CHECK_(nullHandle)); 393 break; 394 case JVM_CONSTANT_NameAndType : { 395 if (!_need_verify) break; 396 int name_ref_index = cp->name_ref_index_at(index); 397 int signature_ref_index = cp->signature_ref_index_at(index); 398 check_property(valid_symbol_at(name_ref_index), 399 "Invalid constant pool index %u in class file %s", 400 name_ref_index, CHECK_(nullHandle)); 401 check_property(valid_symbol_at(signature_ref_index), 402 "Invalid constant pool index %u in class file %s", 403 signature_ref_index, CHECK_(nullHandle)); 404 break; 405 } 406 case JVM_CONSTANT_Utf8 : 407 break; 408 case JVM_CONSTANT_UnresolvedClass : // fall-through 409 case JVM_CONSTANT_UnresolvedClassInError: 410 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 411 break; 412 case JVM_CONSTANT_ClassIndex : 413 { 414 int class_index = cp->klass_index_at(index); 415 check_property(valid_symbol_at(class_index), 416 "Invalid constant pool index %u in class file %s", 417 class_index, CHECK_(nullHandle)); 418 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 419 } 420 break; 421 case JVM_CONSTANT_StringIndex : 422 { 423 int string_index = cp->string_index_at(index); 424 check_property(valid_symbol_at(string_index), 425 "Invalid constant pool index %u in class file %s", 426 string_index, CHECK_(nullHandle)); 427 Symbol* sym = cp->symbol_at(string_index); 428 cp->unresolved_string_at_put(index, sym); 429 } 430 break; 431 case JVM_CONSTANT_MethodHandle : 432 { 433 int ref_index = cp->method_handle_index_at(index); 434 check_property( 435 valid_cp_range(ref_index, length), 436 "Invalid constant pool index %u in class file %s", 437 ref_index, CHECK_(nullHandle)); 438 constantTag tag = cp->tag_at(ref_index); 439 int ref_kind = cp->method_handle_ref_kind_at(index); 440 switch (ref_kind) { 441 case JVM_REF_getField: 442 case JVM_REF_getStatic: 443 case JVM_REF_putField: 444 case JVM_REF_putStatic: 445 check_property( 446 tag.is_field(), 447 "Invalid constant pool index %u in class file %s (not a field)", 448 ref_index, CHECK_(nullHandle)); 449 break; 450 case JVM_REF_invokeVirtual: 451 case JVM_REF_newInvokeSpecial: 452 check_property( 453 tag.is_method(), 454 "Invalid constant pool index %u in class file %s (not a method)", 455 ref_index, CHECK_(nullHandle)); 456 break; 457 case JVM_REF_invokeStatic: 458 case JVM_REF_invokeSpecial: 459 check_property(tag.is_method() || 460 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 461 "Invalid constant pool index %u in class file %s (not a method)", 462 ref_index, CHECK_(nullHandle)); 463 break; 464 case JVM_REF_invokeInterface: 465 check_property( 466 tag.is_interface_method(), 467 "Invalid constant pool index %u in class file %s (not an interface method)", 468 ref_index, CHECK_(nullHandle)); 469 break; 470 default: 471 classfile_parse_error( 472 "Bad method handle kind at constant pool index %u in class file %s", 473 index, CHECK_(nullHandle)); 474 } 475 // Keep the ref_index unchanged. It will be indirected at link-time. 476 } 477 break; 478 case JVM_CONSTANT_MethodType : 479 { 480 int ref_index = cp->method_type_index_at(index); 481 check_property(valid_symbol_at(ref_index), 482 "Invalid constant pool index %u in class file %s", 483 ref_index, CHECK_(nullHandle)); 484 } 485 break; 486 case JVM_CONSTANT_InvokeDynamic : 487 { 488 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 489 check_property(valid_cp_range(name_and_type_ref_index, length) && 490 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 491 "Invalid constant pool index %u in class file %s", 492 name_and_type_ref_index, 493 CHECK_(nullHandle)); 494 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 495 break; 496 } 497 default: 498 fatal("bad constant pool tag value %u", cp->tag_at(index).value()); 499 ShouldNotReachHere(); 500 break; 501 } // end of switch 502 } // end of for 503 504 if (_cp_patches != NULL) { 505 // need to treat this_class specially... 506 int this_class_index; 507 { 508 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 509 u1* mark = cfs->current(); 510 u2 flags = cfs->get_u2_fast(); 511 this_class_index = cfs->get_u2_fast(); 512 cfs->set_current(mark); // revert to mark 513 } 514 515 for (index = 1; index < length; index++) { // Index 0 is unused 516 if (has_cp_patch_at(index)) { 517 guarantee_property(index != this_class_index, 518 "Illegal constant pool patch to self at %d in class file %s", 519 index, CHECK_(nullHandle)); 520 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 521 } 522 } 523 } 524 525 if (!_need_verify) { 526 return cp; 527 } 528 529 // second verification pass - checks the strings are of the right format. 530 // but not yet to the other entries 531 for (index = 1; index < length; index++) { 532 jbyte tag = cp->tag_at(index).value(); 533 switch (tag) { 534 case JVM_CONSTANT_UnresolvedClass: { 535 Symbol* class_name = cp->klass_name_at(index); 536 // check the name, even if _cp_patches will overwrite it 537 verify_legal_class_name(class_name, CHECK_(nullHandle)); 538 break; 539 } 540 case JVM_CONSTANT_NameAndType: { 541 if (_need_verify && _major_version >= JAVA_7_VERSION) { 542 int sig_index = cp->signature_ref_index_at(index); 543 int name_index = cp->name_ref_index_at(index); 544 Symbol* name = cp->symbol_at(name_index); 545 Symbol* sig = cp->symbol_at(sig_index); 546 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 547 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 548 } else { 549 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 550 } 551 } 552 break; 553 } 554 case JVM_CONSTANT_InvokeDynamic: 555 case JVM_CONSTANT_Fieldref: 556 case JVM_CONSTANT_Methodref: 557 case JVM_CONSTANT_InterfaceMethodref: { 558 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 559 // already verified to be utf8 560 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 561 // already verified to be utf8 562 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 563 Symbol* name = cp->symbol_at(name_ref_index); 564 Symbol* signature = cp->symbol_at(signature_ref_index); 565 if (tag == JVM_CONSTANT_Fieldref) { 566 verify_legal_field_name(name, CHECK_(nullHandle)); 567 if (_need_verify && _major_version >= JAVA_7_VERSION) { 568 // Signature is verified above, when iterating NameAndType_info. 569 // Need only to be sure it's the right type. 570 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 571 throwIllegalSignature( 572 "Field", name, signature, CHECK_(nullHandle)); 573 } 574 } else { 575 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 576 } 577 } else { 578 verify_legal_method_name(name, CHECK_(nullHandle)); 579 if (_need_verify && _major_version >= JAVA_7_VERSION) { 580 // Signature is verified above, when iterating NameAndType_info. 581 // Need only to be sure it's the right type. 582 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 583 throwIllegalSignature( 584 "Method", name, signature, CHECK_(nullHandle)); 585 } 586 } else { 587 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 588 } 589 if (tag == JVM_CONSTANT_Methodref) { 590 // 4509014: If a class method name begins with '<', it must be "<init>". 591 assert(name != NULL, "method name in constant pool is null"); 592 unsigned int name_len = name->utf8_length(); 593 assert(name_len > 0, "bad method name"); // already verified as legal name 594 if (name->byte_at(0) == '<') { 595 if (name != vmSymbols::object_initializer_name()) { 596 classfile_parse_error( 597 "Bad method name at constant pool index %u in class file %s", 598 name_ref_index, CHECK_(nullHandle)); 599 } 600 } 601 } 602 } 603 break; 604 } 605 case JVM_CONSTANT_MethodHandle: { 606 int ref_index = cp->method_handle_index_at(index); 607 int ref_kind = cp->method_handle_ref_kind_at(index); 608 switch (ref_kind) { 609 case JVM_REF_invokeVirtual: 610 case JVM_REF_invokeStatic: 611 case JVM_REF_invokeSpecial: 612 case JVM_REF_newInvokeSpecial: 613 { 614 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 615 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 616 Symbol* name = cp->symbol_at(name_ref_index); 617 if (ref_kind == JVM_REF_newInvokeSpecial) { 618 if (name != vmSymbols::object_initializer_name()) { 619 classfile_parse_error( 620 "Bad constructor name at constant pool index %u in class file %s", 621 name_ref_index, CHECK_(nullHandle)); 622 } 623 } else { 624 if (name == vmSymbols::object_initializer_name()) { 625 classfile_parse_error( 626 "Bad method name at constant pool index %u in class file %s", 627 name_ref_index, CHECK_(nullHandle)); 628 } 629 } 630 } 631 break; 632 // Other ref_kinds are already fully checked in previous pass. 633 } 634 break; 635 } 636 case JVM_CONSTANT_MethodType: { 637 Symbol* no_name = vmSymbols::type_name(); // place holder 638 Symbol* signature = cp->method_type_signature_at(index); 639 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 640 break; 641 } 642 case JVM_CONSTANT_Utf8: { 643 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 644 } 645 } // end of switch 646 } // end of for 647 648 return cp; 649 } 650 651 652 void ClassFileParser::patch_constant_pool(const constantPoolHandle& cp, int index, Handle patch, TRAPS) { 653 BasicType patch_type = T_VOID; 654 655 switch (cp->tag_at(index).value()) { 656 657 case JVM_CONSTANT_UnresolvedClass : 658 // Patching a class means pre-resolving it. 659 // The name in the constant pool is ignored. 660 if (java_lang_Class::is_instance(patch())) { 661 guarantee_property(!java_lang_Class::is_primitive(patch()), 662 "Illegal class patch at %d in class file %s", 663 index, CHECK); 664 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 665 } else { 666 guarantee_property(java_lang_String::is_instance(patch()), 667 "Illegal class patch at %d in class file %s", 668 index, CHECK); 669 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 670 cp->unresolved_klass_at_put(index, name); 671 } 672 break; 673 674 case JVM_CONSTANT_String : 675 // skip this patch and don't clear it. Needs the oop array for resolved 676 // references to be created first. 677 return; 678 679 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 680 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 681 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 682 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 683 patch_prim: 684 { 685 jvalue value; 686 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 687 guarantee_property(value_type == patch_type, 688 "Illegal primitive patch at %d in class file %s", 689 index, CHECK); 690 switch (value_type) { 691 case T_INT: cp->int_at_put(index, value.i); break; 692 case T_FLOAT: cp->float_at_put(index, value.f); break; 693 case T_LONG: cp->long_at_put(index, value.j); break; 694 case T_DOUBLE: cp->double_at_put(index, value.d); break; 695 default: assert(false, ""); 696 } 697 } 698 break; 699 700 default: 701 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 702 guarantee_property(!has_cp_patch_at(index), 703 "Illegal unexpected patch at %d in class file %s", 704 index, CHECK); 705 return; 706 } 707 708 // On fall-through, mark the patch as used. 709 clear_cp_patch_at(index); 710 } 711 712 713 class NameSigHash: public ResourceObj { 714 public: 715 Symbol* _name; // name 716 Symbol* _sig; // signature 717 NameSigHash* _next; // Next entry in hash table 718 }; 719 720 721 #define HASH_ROW_SIZE 256 722 723 unsigned int hash(Symbol* name, Symbol* sig) { 724 unsigned int raw_hash = 0; 725 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 726 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 727 728 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 729 } 730 731 732 void initialize_hashtable(NameSigHash** table) { 733 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 734 } 735 736 // Return false if the name/sig combination is found in table. 737 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 738 // The old format checker uses heap sort to find duplicates. 739 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 740 // of table since we don't expect Symbol*'s to move. 741 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 742 assert(name != NULL, "name in constant pool is NULL"); 743 744 // First lookup for duplicates 745 int index = hash(name, sig); 746 NameSigHash* entry = table[index]; 747 while (entry != NULL) { 748 if (entry->_name == name && entry->_sig == sig) { 749 return false; 750 } 751 entry = entry->_next; 752 } 753 754 // No duplicate is found, allocate a new entry and fill it. 755 entry = new NameSigHash(); 756 entry->_name = name; 757 entry->_sig = sig; 758 759 // Insert into hash table 760 entry->_next = table[index]; 761 table[index] = entry; 762 763 return true; 764 } 765 766 767 Array<Klass*>* ClassFileParser::parse_interfaces(int length, 768 Handle protection_domain, 769 Symbol* class_name, 770 bool* has_default_methods, 771 TRAPS) { 772 if (length == 0) { 773 _local_interfaces = Universe::the_empty_klass_array(); 774 } else { 775 ClassFileStream* cfs = stream(); 776 assert(length > 0, "only called for length>0"); 777 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 778 779 int index; 780 for (index = 0; index < length; index++) { 781 u2 interface_index = cfs->get_u2(CHECK_NULL); 782 KlassHandle interf; 783 check_property( 784 valid_klass_reference_at(interface_index), 785 "Interface name has bad constant pool index %u in class file %s", 786 interface_index, CHECK_NULL); 787 if (_cp->tag_at(interface_index).is_klass()) { 788 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 789 } else { 790 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 791 792 // Don't need to check legal name because it's checked when parsing constant pool. 793 // But need to make sure it's not an array type. 794 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 795 "Bad interface name in class file %s", CHECK_NULL); 796 Handle class_loader(THREAD, _loader_data->class_loader()); 797 798 // Call resolve_super so classcircularity is checked 799 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 800 unresolved_klass, class_loader, protection_domain, 801 false, CHECK_NULL); 802 interf = KlassHandle(THREAD, k); 803 } 804 805 if (!interf()->is_interface()) { 806 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 807 } 808 if (InstanceKlass::cast(interf())->has_default_methods()) { 809 *has_default_methods = true; 810 } 811 _local_interfaces->at_put(index, interf()); 812 } 813 814 if (!_need_verify || length <= 1) { 815 return _local_interfaces; 816 } 817 818 // Check if there's any duplicates in interfaces 819 ResourceMark rm(THREAD); 820 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 821 THREAD, NameSigHash*, HASH_ROW_SIZE); 822 initialize_hashtable(interface_names); 823 bool dup = false; 824 { 825 debug_only(No_Safepoint_Verifier nsv;) 826 for (index = 0; index < length; index++) { 827 Klass* k = _local_interfaces->at(index); 828 Symbol* name = k->name(); 829 // If no duplicates, add (name, NULL) in hashtable interface_names. 830 if (!put_after_lookup(name, NULL, interface_names)) { 831 dup = true; 832 break; 833 } 834 } 835 } 836 if (dup) { 837 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); 838 } 839 } 840 return _local_interfaces; 841 } 842 843 844 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 845 // Make sure the constant pool entry is of a type appropriate to this field 846 guarantee_property( 847 (constantvalue_index > 0 && 848 constantvalue_index < _cp->length()), 849 "Bad initial value index %u in ConstantValue attribute in class file %s", 850 constantvalue_index, CHECK); 851 constantTag value_type = _cp->tag_at(constantvalue_index); 852 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 853 case T_LONG: 854 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 855 break; 856 case T_FLOAT: 857 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 858 break; 859 case T_DOUBLE: 860 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 861 break; 862 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 863 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 864 break; 865 case T_OBJECT: 866 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 867 && value_type.is_string()), 868 "Bad string initial value in class file %s", CHECK); 869 break; 870 default: 871 classfile_parse_error( 872 "Unable to set initial value %u in class file %s", 873 constantvalue_index, CHECK); 874 } 875 } 876 877 878 // Parse attributes for a field. 879 void ClassFileParser::parse_field_attributes(u2 attributes_count, 880 bool is_static, u2 signature_index, 881 u2* constantvalue_index_addr, 882 bool* is_synthetic_addr, 883 u2* generic_signature_index_addr, 884 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 885 TRAPS) { 886 ClassFileStream* cfs = stream(); 887 assert(attributes_count > 0, "length should be greater than 0"); 888 u2 constantvalue_index = 0; 889 u2 generic_signature_index = 0; 890 bool is_synthetic = false; 891 u1* runtime_visible_annotations = NULL; 892 int runtime_visible_annotations_length = 0; 893 u1* runtime_invisible_annotations = NULL; 894 int runtime_invisible_annotations_length = 0; 895 u1* runtime_visible_type_annotations = NULL; 896 int runtime_visible_type_annotations_length = 0; 897 u1* runtime_invisible_type_annotations = NULL; 898 int runtime_invisible_type_annotations_length = 0; 899 bool runtime_invisible_annotations_exists = false; 900 bool runtime_invisible_type_annotations_exists = false; 901 while (attributes_count--) { 902 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 903 u2 attribute_name_index = cfs->get_u2_fast(); 904 u4 attribute_length = cfs->get_u4_fast(); 905 check_property(valid_symbol_at(attribute_name_index), 906 "Invalid field attribute index %u in class file %s", 907 attribute_name_index, 908 CHECK); 909 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 910 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 911 // ignore if non-static 912 if (constantvalue_index != 0) { 913 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 914 } 915 check_property( 916 attribute_length == 2, 917 "Invalid ConstantValue field attribute length %u in class file %s", 918 attribute_length, CHECK); 919 constantvalue_index = cfs->get_u2(CHECK); 920 if (_need_verify) { 921 verify_constantvalue(constantvalue_index, signature_index, CHECK); 922 } 923 } else if (attribute_name == vmSymbols::tag_synthetic()) { 924 if (attribute_length != 0) { 925 classfile_parse_error( 926 "Invalid Synthetic field attribute length %u in class file %s", 927 attribute_length, CHECK); 928 } 929 is_synthetic = true; 930 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 931 if (attribute_length != 0) { 932 classfile_parse_error( 933 "Invalid Deprecated field attribute length %u in class file %s", 934 attribute_length, CHECK); 935 } 936 } else if (_major_version >= JAVA_1_5_VERSION) { 937 if (attribute_name == vmSymbols::tag_signature()) { 938 if (attribute_length != 2) { 939 classfile_parse_error( 940 "Wrong size %u for field's Signature attribute in class file %s", 941 attribute_length, CHECK); 942 } 943 generic_signature_index = parse_generic_signature_attribute(CHECK); 944 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 945 if (runtime_visible_annotations != NULL) { 946 classfile_parse_error( 947 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 948 } 949 runtime_visible_annotations_length = attribute_length; 950 runtime_visible_annotations = cfs->get_u1_buffer(); 951 assert(runtime_visible_annotations != NULL, "null visible annotations"); 952 parse_annotations(runtime_visible_annotations, 953 runtime_visible_annotations_length, 954 parsed_annotations); 955 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 956 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 957 if (runtime_invisible_annotations_exists) { 958 classfile_parse_error( 959 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 960 } 961 runtime_invisible_annotations_exists = true; 962 if (PreserveAllAnnotations) { 963 runtime_invisible_annotations_length = attribute_length; 964 runtime_invisible_annotations = cfs->get_u1_buffer(); 965 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 966 } 967 cfs->skip_u1(attribute_length, CHECK); 968 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 969 if (runtime_visible_type_annotations != NULL) { 970 classfile_parse_error( 971 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 972 } 973 runtime_visible_type_annotations_length = attribute_length; 974 runtime_visible_type_annotations = cfs->get_u1_buffer(); 975 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 976 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 977 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 978 if (runtime_invisible_type_annotations_exists) { 979 classfile_parse_error( 980 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 981 } else { 982 runtime_invisible_type_annotations_exists = true; 983 } 984 if (PreserveAllAnnotations) { 985 runtime_invisible_type_annotations_length = attribute_length; 986 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 987 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 988 } 989 cfs->skip_u1(attribute_length, CHECK); 990 } else { 991 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 992 } 993 } else { 994 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 995 } 996 } 997 998 *constantvalue_index_addr = constantvalue_index; 999 *is_synthetic_addr = is_synthetic; 1000 *generic_signature_index_addr = generic_signature_index; 1001 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 1002 runtime_visible_annotations_length, 1003 runtime_invisible_annotations, 1004 runtime_invisible_annotations_length, 1005 CHECK); 1006 parsed_annotations->set_field_annotations(a); 1007 a = assemble_annotations(runtime_visible_type_annotations, 1008 runtime_visible_type_annotations_length, 1009 runtime_invisible_type_annotations, 1010 runtime_invisible_type_annotations_length, 1011 CHECK); 1012 parsed_annotations->set_field_type_annotations(a); 1013 return; 1014 } 1015 1016 1017 // Field allocation types. Used for computing field offsets. 1018 1019 enum FieldAllocationType { 1020 STATIC_OOP, // Oops 1021 STATIC_BYTE, // Boolean, Byte, char 1022 STATIC_SHORT, // shorts 1023 STATIC_WORD, // ints 1024 STATIC_DOUBLE, // aligned long or double 1025 NONSTATIC_OOP, 1026 NONSTATIC_BYTE, 1027 NONSTATIC_SHORT, 1028 NONSTATIC_WORD, 1029 NONSTATIC_DOUBLE, 1030 MAX_FIELD_ALLOCATION_TYPE, 1031 BAD_ALLOCATION_TYPE = -1 1032 }; 1033 1034 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1035 BAD_ALLOCATION_TYPE, // 0 1036 BAD_ALLOCATION_TYPE, // 1 1037 BAD_ALLOCATION_TYPE, // 2 1038 BAD_ALLOCATION_TYPE, // 3 1039 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1040 NONSTATIC_SHORT, // T_CHAR = 5, 1041 NONSTATIC_WORD, // T_FLOAT = 6, 1042 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1043 NONSTATIC_BYTE, // T_BYTE = 8, 1044 NONSTATIC_SHORT, // T_SHORT = 9, 1045 NONSTATIC_WORD, // T_INT = 10, 1046 NONSTATIC_DOUBLE, // T_LONG = 11, 1047 NONSTATIC_OOP, // T_OBJECT = 12, 1048 NONSTATIC_OOP, // T_ARRAY = 13, 1049 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1050 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1051 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1052 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1053 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1054 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1055 BAD_ALLOCATION_TYPE, // 0 1056 BAD_ALLOCATION_TYPE, // 1 1057 BAD_ALLOCATION_TYPE, // 2 1058 BAD_ALLOCATION_TYPE, // 3 1059 STATIC_BYTE , // T_BOOLEAN = 4, 1060 STATIC_SHORT, // T_CHAR = 5, 1061 STATIC_WORD, // T_FLOAT = 6, 1062 STATIC_DOUBLE, // T_DOUBLE = 7, 1063 STATIC_BYTE, // T_BYTE = 8, 1064 STATIC_SHORT, // T_SHORT = 9, 1065 STATIC_WORD, // T_INT = 10, 1066 STATIC_DOUBLE, // T_LONG = 11, 1067 STATIC_OOP, // T_OBJECT = 12, 1068 STATIC_OOP, // T_ARRAY = 13, 1069 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1070 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1071 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1072 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1073 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1074 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1075 }; 1076 1077 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1078 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1079 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1080 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1081 return result; 1082 } 1083 1084 class FieldAllocationCount: public ResourceObj { 1085 public: 1086 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1087 1088 FieldAllocationCount() { 1089 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1090 count[i] = 0; 1091 } 1092 } 1093 1094 FieldAllocationType update(bool is_static, BasicType type) { 1095 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1096 // Make sure there is no overflow with injected fields. 1097 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1098 count[atype]++; 1099 return atype; 1100 } 1101 }; 1102 1103 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1104 bool is_interface, 1105 FieldAllocationCount *fac, 1106 u2* java_fields_count_ptr, TRAPS) { 1107 ClassFileStream* cfs = stream(); 1108 cfs->guarantee_more(2, CHECK_NULL); // length 1109 u2 length = cfs->get_u2_fast(); 1110 *java_fields_count_ptr = length; 1111 1112 int num_injected = 0; 1113 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1114 int total_fields = length + num_injected; 1115 1116 // The field array starts with tuples of shorts 1117 // [access, name index, sig index, initial value index, byte offset]. 1118 // A generic signature slot only exists for field with generic 1119 // signature attribute. And the access flag is set with 1120 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1121 // signature slots are at the end of the field array and after all 1122 // other fields data. 1123 // 1124 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1125 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1126 // ... 1127 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1128 // [generic signature index] 1129 // [generic signature index] 1130 // ... 1131 // 1132 // Allocate a temporary resource array for field data. For each field, 1133 // a slot is reserved in the temporary array for the generic signature 1134 // index. After parsing all fields, the data are copied to a permanent 1135 // array and any unused slots will be discarded. 1136 ResourceMark rm(THREAD); 1137 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1138 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1139 1140 // The generic signature slots start after all other fields' data. 1141 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1142 int num_generic_signature = 0; 1143 for (int n = 0; n < length; n++) { 1144 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1145 1146 AccessFlags access_flags; 1147 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1148 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1149 access_flags.set_flags(flags); 1150 1151 u2 name_index = cfs->get_u2_fast(); 1152 int cp_size = _cp->length(); 1153 check_property(valid_symbol_at(name_index), 1154 "Invalid constant pool index %u for field name in class file %s", 1155 name_index, 1156 CHECK_NULL); 1157 Symbol* name = _cp->symbol_at(name_index); 1158 verify_legal_field_name(name, CHECK_NULL); 1159 1160 u2 signature_index = cfs->get_u2_fast(); 1161 check_property(valid_symbol_at(signature_index), 1162 "Invalid constant pool index %u for field signature in class file %s", 1163 signature_index, CHECK_NULL); 1164 Symbol* sig = _cp->symbol_at(signature_index); 1165 verify_legal_field_signature(name, sig, CHECK_NULL); 1166 1167 u2 constantvalue_index = 0; 1168 bool is_synthetic = false; 1169 u2 generic_signature_index = 0; 1170 bool is_static = access_flags.is_static(); 1171 FieldAnnotationCollector parsed_annotations(_loader_data); 1172 1173 u2 attributes_count = cfs->get_u2_fast(); 1174 if (attributes_count > 0) { 1175 parse_field_attributes(attributes_count, is_static, signature_index, 1176 &constantvalue_index, &is_synthetic, 1177 &generic_signature_index, &parsed_annotations, 1178 CHECK_NULL); 1179 if (parsed_annotations.field_annotations() != NULL) { 1180 if (_fields_annotations == NULL) { 1181 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1182 _loader_data, length, NULL, 1183 CHECK_NULL); 1184 } 1185 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1186 parsed_annotations.set_field_annotations(NULL); 1187 } 1188 if (parsed_annotations.field_type_annotations() != NULL) { 1189 if (_fields_type_annotations == NULL) { 1190 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1191 _loader_data, length, NULL, 1192 CHECK_NULL); 1193 } 1194 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1195 parsed_annotations.set_field_type_annotations(NULL); 1196 } 1197 1198 if (is_synthetic) { 1199 access_flags.set_is_synthetic(); 1200 } 1201 if (generic_signature_index != 0) { 1202 access_flags.set_field_has_generic_signature(); 1203 fa[generic_signature_slot] = generic_signature_index; 1204 generic_signature_slot ++; 1205 num_generic_signature ++; 1206 } 1207 } 1208 1209 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1210 field->initialize(access_flags.as_short(), 1211 name_index, 1212 signature_index, 1213 constantvalue_index); 1214 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1215 1216 // Remember how many oops we encountered and compute allocation type 1217 FieldAllocationType atype = fac->update(is_static, type); 1218 field->set_allocation_type(atype); 1219 1220 // After field is initialized with type, we can augment it with aux info 1221 if (parsed_annotations.has_any_annotations()) 1222 parsed_annotations.apply_to(field); 1223 } 1224 1225 int index = length; 1226 if (num_injected != 0) { 1227 for (int n = 0; n < num_injected; n++) { 1228 // Check for duplicates 1229 if (injected[n].may_be_java) { 1230 Symbol* name = injected[n].name(); 1231 Symbol* signature = injected[n].signature(); 1232 bool duplicate = false; 1233 for (int i = 0; i < length; i++) { 1234 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1235 if (name == _cp->symbol_at(f->name_index()) && 1236 signature == _cp->symbol_at(f->signature_index())) { 1237 // Symbol is desclared in Java so skip this one 1238 duplicate = true; 1239 break; 1240 } 1241 } 1242 if (duplicate) { 1243 // These will be removed from the field array at the end 1244 continue; 1245 } 1246 } 1247 1248 // Injected field 1249 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1250 field->initialize(JVM_ACC_FIELD_INTERNAL, 1251 injected[n].name_index, 1252 injected[n].signature_index, 1253 0); 1254 1255 BasicType type = FieldType::basic_type(injected[n].signature()); 1256 1257 // Remember how many oops we encountered and compute allocation type 1258 FieldAllocationType atype = fac->update(false, type); 1259 field->set_allocation_type(atype); 1260 index++; 1261 } 1262 } 1263 1264 // Now copy the fields' data from the temporary resource array. 1265 // Sometimes injected fields already exist in the Java source so 1266 // the fields array could be too long. In that case the 1267 // fields array is trimed. Also unused slots that were reserved 1268 // for generic signature indexes are discarded. 1269 Array<u2>* fields = MetadataFactory::new_array<u2>( 1270 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1271 CHECK_NULL); 1272 _fields = fields; // save in case of error 1273 { 1274 int i = 0; 1275 for (; i < index * FieldInfo::field_slots; i++) { 1276 fields->at_put(i, fa[i]); 1277 } 1278 for (int j = total_fields * FieldInfo::field_slots; 1279 j < generic_signature_slot; j++) { 1280 fields->at_put(i++, fa[j]); 1281 } 1282 assert(i == fields->length(), ""); 1283 } 1284 1285 if (_need_verify && length > 1) { 1286 // Check duplicated fields 1287 ResourceMark rm(THREAD); 1288 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1289 THREAD, NameSigHash*, HASH_ROW_SIZE); 1290 initialize_hashtable(names_and_sigs); 1291 bool dup = false; 1292 { 1293 debug_only(No_Safepoint_Verifier nsv;) 1294 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1295 Symbol* name = fs.name(); 1296 Symbol* sig = fs.signature(); 1297 // If no duplicates, add name/signature in hashtable names_and_sigs. 1298 if (!put_after_lookup(name, sig, names_and_sigs)) { 1299 dup = true; 1300 break; 1301 } 1302 } 1303 } 1304 if (dup) { 1305 classfile_parse_error("Duplicate field name&signature in class file %s", 1306 CHECK_NULL); 1307 } 1308 } 1309 1310 return fields; 1311 } 1312 1313 1314 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1315 while (length-- > 0) { 1316 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1317 } 1318 } 1319 1320 1321 u2* ClassFileParser::parse_exception_table(u4 code_length, 1322 u4 exception_table_length, 1323 TRAPS) { 1324 ClassFileStream* cfs = stream(); 1325 1326 u2* exception_table_start = cfs->get_u2_buffer(); 1327 assert(exception_table_start != NULL, "null exception table"); 1328 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1329 // Will check legal target after parsing code array in verifier. 1330 if (_need_verify) { 1331 for (unsigned int i = 0; i < exception_table_length; i++) { 1332 u2 start_pc = cfs->get_u2_fast(); 1333 u2 end_pc = cfs->get_u2_fast(); 1334 u2 handler_pc = cfs->get_u2_fast(); 1335 u2 catch_type_index = cfs->get_u2_fast(); 1336 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1337 "Illegal exception table range in class file %s", 1338 CHECK_NULL); 1339 guarantee_property(handler_pc < code_length, 1340 "Illegal exception table handler in class file %s", 1341 CHECK_NULL); 1342 if (catch_type_index != 0) { 1343 guarantee_property(valid_klass_reference_at(catch_type_index), 1344 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1345 } 1346 } 1347 } else { 1348 cfs->skip_u2_fast(exception_table_length * 4); 1349 } 1350 return exception_table_start; 1351 } 1352 1353 void ClassFileParser::parse_linenumber_table( 1354 u4 code_attribute_length, u4 code_length, 1355 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1356 ClassFileStream* cfs = stream(); 1357 unsigned int num_entries = cfs->get_u2(CHECK); 1358 1359 // Each entry is a u2 start_pc, and a u2 line_number 1360 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1361 1362 // Verify line number attribute and table length 1363 check_property( 1364 code_attribute_length == sizeof(u2) + length_in_bytes, 1365 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1366 1367 cfs->guarantee_more(length_in_bytes, CHECK); 1368 1369 if ((*write_stream) == NULL) { 1370 if (length_in_bytes > fixed_buffer_size) { 1371 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1372 } else { 1373 (*write_stream) = new CompressedLineNumberWriteStream( 1374 linenumbertable_buffer, fixed_buffer_size); 1375 } 1376 } 1377 1378 while (num_entries-- > 0) { 1379 u2 bci = cfs->get_u2_fast(); // start_pc 1380 u2 line = cfs->get_u2_fast(); // line_number 1381 guarantee_property(bci < code_length, 1382 "Invalid pc in LineNumberTable in class file %s", CHECK); 1383 (*write_stream)->write_pair(bci, line); 1384 } 1385 } 1386 1387 1388 class LVT_Hash : public AllStatic { 1389 public: 1390 1391 static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { 1392 /* 1393 * 3-tuple start_bci/length/slot has to be unique key, 1394 * so the following comparison seems to be redundant: 1395 * && elem->name_cp_index == entry->_elem->name_cp_index 1396 */ 1397 return (e0.start_bci == e1.start_bci && 1398 e0.length == e1.length && 1399 e0.name_cp_index == e1.name_cp_index && 1400 e0.slot == e1.slot); 1401 } 1402 1403 static unsigned int hash(LocalVariableTableElement const& e0) { 1404 unsigned int raw_hash = e0.start_bci; 1405 1406 raw_hash = e0.length + raw_hash * 37; 1407 raw_hash = e0.name_cp_index + raw_hash * 37; 1408 raw_hash = e0.slot + raw_hash * 37; 1409 1410 return raw_hash; 1411 } 1412 }; 1413 1414 1415 // Class file LocalVariableTable elements. 1416 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1417 public: 1418 u2 start_bci; 1419 u2 length; 1420 u2 name_cp_index; 1421 u2 descriptor_cp_index; 1422 u2 slot; 1423 }; 1424 1425 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1426 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1427 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1428 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1429 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1430 lvt->signature_cp_index = 0; 1431 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1432 } 1433 1434 // Function is used to parse both attributes: 1435 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1436 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1437 u2 max_locals, 1438 u4 code_attribute_length, 1439 u2* localvariable_table_length, 1440 bool isLVTT, 1441 TRAPS) { 1442 ClassFileStream* cfs = stream(); 1443 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1444 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1445 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1446 // Verify local variable table attribute has right length 1447 if (_need_verify) { 1448 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1449 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1450 } 1451 u2* localvariable_table_start = cfs->get_u2_buffer(); 1452 assert(localvariable_table_start != NULL, "null local variable table"); 1453 if (!_need_verify) { 1454 cfs->skip_u2_fast(size); 1455 } else { 1456 cfs->guarantee_more(size * 2, CHECK_NULL); 1457 for(int i = 0; i < (*localvariable_table_length); i++) { 1458 u2 start_pc = cfs->get_u2_fast(); 1459 u2 length = cfs->get_u2_fast(); 1460 u2 name_index = cfs->get_u2_fast(); 1461 u2 descriptor_index = cfs->get_u2_fast(); 1462 u2 index = cfs->get_u2_fast(); 1463 // Assign to a u4 to avoid overflow 1464 u4 end_pc = (u4)start_pc + (u4)length; 1465 1466 if (start_pc >= code_length) { 1467 classfile_parse_error( 1468 "Invalid start_pc %u in %s in class file %s", 1469 start_pc, tbl_name, CHECK_NULL); 1470 } 1471 if (end_pc > code_length) { 1472 classfile_parse_error( 1473 "Invalid length %u in %s in class file %s", 1474 length, tbl_name, CHECK_NULL); 1475 } 1476 int cp_size = _cp->length(); 1477 guarantee_property(valid_symbol_at(name_index), 1478 "Name index %u in %s has bad constant type in class file %s", 1479 name_index, tbl_name, CHECK_NULL); 1480 guarantee_property(valid_symbol_at(descriptor_index), 1481 "Signature index %u in %s has bad constant type in class file %s", 1482 descriptor_index, tbl_name, CHECK_NULL); 1483 1484 Symbol* name = _cp->symbol_at(name_index); 1485 Symbol* sig = _cp->symbol_at(descriptor_index); 1486 verify_legal_field_name(name, CHECK_NULL); 1487 u2 extra_slot = 0; 1488 if (!isLVTT) { 1489 verify_legal_field_signature(name, sig, CHECK_NULL); 1490 1491 // 4894874: check special cases for double and long local variables 1492 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1493 sig == vmSymbols::type_signature(T_LONG)) { 1494 extra_slot = 1; 1495 } 1496 } 1497 guarantee_property((index + extra_slot) < max_locals, 1498 "Invalid index %u in %s in class file %s", 1499 index, tbl_name, CHECK_NULL); 1500 } 1501 } 1502 return localvariable_table_start; 1503 } 1504 1505 1506 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1507 u1* u1_array, u2* u2_array, TRAPS) { 1508 ClassFileStream* cfs = stream(); 1509 u2 index = 0; // index in the array with long/double occupying two slots 1510 u4 i1 = *u1_index; 1511 u4 i2 = *u2_index + 1; 1512 for(int i = 0; i < array_length; i++) { 1513 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1514 index++; 1515 if (tag == ITEM_Long || tag == ITEM_Double) { 1516 index++; 1517 } else if (tag == ITEM_Object) { 1518 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1519 guarantee_property(valid_klass_reference_at(class_index), 1520 "Bad class index %u in StackMap in class file %s", 1521 class_index, CHECK); 1522 } else if (tag == ITEM_Uninitialized) { 1523 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1524 guarantee_property( 1525 offset < code_length, 1526 "Bad uninitialized type offset %u in StackMap in class file %s", 1527 offset, CHECK); 1528 } else { 1529 guarantee_property( 1530 tag <= (u1)ITEM_Uninitialized, 1531 "Unknown variable type %u in StackMap in class file %s", 1532 tag, CHECK); 1533 } 1534 } 1535 u2_array[*u2_index] = index; 1536 *u1_index = i1; 1537 *u2_index = i2; 1538 } 1539 1540 u1* ClassFileParser::parse_stackmap_table( 1541 u4 code_attribute_length, TRAPS) { 1542 if (code_attribute_length == 0) 1543 return NULL; 1544 1545 ClassFileStream* cfs = stream(); 1546 u1* stackmap_table_start = cfs->get_u1_buffer(); 1547 assert(stackmap_table_start != NULL, "null stackmap table"); 1548 1549 // check code_attribute_length first 1550 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1551 1552 if (!_need_verify && !DumpSharedSpaces) { 1553 return NULL; 1554 } 1555 return stackmap_table_start; 1556 } 1557 1558 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1559 u4 method_attribute_length, 1560 TRAPS) { 1561 ClassFileStream* cfs = stream(); 1562 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1563 *checked_exceptions_length = cfs->get_u2_fast(); 1564 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1565 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1566 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1567 if (!_need_verify) { 1568 cfs->skip_u2_fast(size); 1569 } else { 1570 // Verify each value in the checked exception table 1571 u2 checked_exception; 1572 u2 len = *checked_exceptions_length; 1573 cfs->guarantee_more(2 * len, CHECK_NULL); 1574 for (int i = 0; i < len; i++) { 1575 checked_exception = cfs->get_u2_fast(); 1576 check_property( 1577 valid_klass_reference_at(checked_exception), 1578 "Exception name has bad type at constant pool %u in class file %s", 1579 checked_exception, CHECK_NULL); 1580 } 1581 } 1582 // check exceptions attribute length 1583 if (_need_verify) { 1584 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1585 sizeof(u2) * size), 1586 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1587 } 1588 return checked_exceptions_start; 1589 } 1590 1591 void ClassFileParser::throwIllegalSignature( 1592 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1593 ResourceMark rm(THREAD); 1594 Exceptions::fthrow(THREAD_AND_LOCATION, 1595 vmSymbols::java_lang_ClassFormatError(), 1596 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1597 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1598 } 1599 1600 // Skip an annotation. Return >=limit if there is any problem. 1601 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1602 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1603 // value := switch (tag:u1) { ... } 1604 index += 2; // skip atype 1605 if ((index += 2) >= limit) return limit; // read nmem 1606 int nmem = Bytes::get_Java_u2(buffer+index-2); 1607 while (--nmem >= 0 && index < limit) { 1608 index += 2; // skip member 1609 index = skip_annotation_value(buffer, limit, index); 1610 } 1611 return index; 1612 } 1613 1614 // Skip an annotation value. Return >=limit if there is any problem. 1615 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1616 // value := switch (tag:u1) { 1617 // case B, C, I, S, Z, D, F, J, c: con:u2; 1618 // case e: e_class:u2 e_name:u2; 1619 // case s: s_con:u2; 1620 // case [: do(nval:u2) {value}; 1621 // case @: annotation; 1622 // case s: s_con:u2; 1623 // } 1624 if ((index += 1) >= limit) return limit; // read tag 1625 u1 tag = buffer[index-1]; 1626 switch (tag) { 1627 case 'B': case 'C': case 'I': case 'S': case 'Z': 1628 case 'D': case 'F': case 'J': case 'c': case 's': 1629 index += 2; // skip con or s_con 1630 break; 1631 case 'e': 1632 index += 4; // skip e_class, e_name 1633 break; 1634 case '[': 1635 { 1636 if ((index += 2) >= limit) return limit; // read nval 1637 int nval = Bytes::get_Java_u2(buffer+index-2); 1638 while (--nval >= 0 && index < limit) { 1639 index = skip_annotation_value(buffer, limit, index); 1640 } 1641 } 1642 break; 1643 case '@': 1644 index = skip_annotation(buffer, limit, index); 1645 break; 1646 default: 1647 return limit; // bad tag byte 1648 } 1649 return index; 1650 } 1651 1652 // Sift through annotations, looking for those significant to the VM: 1653 void ClassFileParser::parse_annotations(u1* buffer, int limit, 1654 ClassFileParser::AnnotationCollector* coll) { 1655 // annotations := do(nann:u2) {annotation} 1656 int index = 0; 1657 if ((index += 2) >= limit) return; // read nann 1658 int nann = Bytes::get_Java_u2(buffer+index-2); 1659 enum { // initial annotation layout 1660 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1661 count_off = 2, // u2 such as 1 (one value) 1662 member_off = 4, // utf8 such as 'value' 1663 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1664 e_tag_val = 'e', 1665 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1666 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1667 e_size = 11, // end of 'e' annotation 1668 c_tag_val = 'c', // payload is type 1669 c_con_off = 7, // utf8 payload, such as 'I' 1670 c_size = 9, // end of 'c' annotation 1671 s_tag_val = 's', // payload is String 1672 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1673 s_size = 9, 1674 min_size = 6 // smallest possible size (zero members) 1675 }; 1676 while ((--nann) >= 0 && (index-2 + min_size <= limit)) { 1677 int index0 = index; 1678 index = skip_annotation(buffer, limit, index); 1679 u1* abase = buffer + index0; 1680 int atype = Bytes::get_Java_u2(abase + atype_off); 1681 int count = Bytes::get_Java_u2(abase + count_off); 1682 Symbol* aname = check_symbol_at(_cp, atype); 1683 if (aname == NULL) break; // invalid annotation name 1684 Symbol* member = NULL; 1685 if (count >= 1) { 1686 int member_index = Bytes::get_Java_u2(abase + member_off); 1687 member = check_symbol_at(_cp, member_index); 1688 if (member == NULL) break; // invalid member name 1689 } 1690 1691 // Here is where parsing particular annotations will take place. 1692 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1693 if (id == AnnotationCollector::_unknown) continue; 1694 coll->set_annotation(id); 1695 1696 if (id == AnnotationCollector::_sun_misc_Contended) { 1697 // @Contended can optionally specify the contention group. 1698 // 1699 // Contended group defines the equivalence class over the fields: 1700 // the fields within the same contended group are not treated distinct. 1701 // The only exception is default group, which does not incur the 1702 // equivalence. Naturally, contention group for classes is meaningless. 1703 // 1704 // While the contention group is specified as String, annotation 1705 // values are already interned, and we might as well use the constant 1706 // pool index as the group tag. 1707 // 1708 u2 group_index = 0; // default contended group 1709 if (count == 1 1710 && s_size == (index - index0) // match size 1711 && s_tag_val == *(abase + tag_off) 1712 && member == vmSymbols::value_name()) { 1713 group_index = Bytes::get_Java_u2(abase + s_con_off); 1714 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1715 group_index = 0; // default contended group 1716 } 1717 } 1718 coll->set_contended_group(group_index); 1719 } 1720 // The Accessor-Annotation specifies the field name it 1721 // belongs to. The index of the symbol is later stored in 1722 // the method. 1723 if (id == AnnotationCollector::_method_Accessor_Method) { 1724 u2 group_index = 0; 1725 if (count == 1 1726 && s_size == (index - index0) // match size 1727 && s_tag_val == *(abase + tag_off) 1728 && member == vmSymbols::value_name()) { 1729 group_index = Bytes::get_Java_u2(abase + s_con_off); 1730 if (_cp->symbol_at(group_index)->utf8_length() != 0) { 1731 coll->set_accessor_field_name(group_index); 1732 } 1733 } 1734 } 1735 } 1736 } 1737 1738 ClassFileParser::AnnotationCollector::ID 1739 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1740 Symbol* name) { 1741 vmSymbols::SID sid = vmSymbols::find_sid(name); 1742 // Privileged code can use all annotations. Other code silently drops some. 1743 const bool privileged = loader_data->is_the_null_class_loader_data() || 1744 loader_data->is_ext_class_loader_data() || 1745 loader_data->is_anonymous(); 1746 switch (sid) { 1747 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1748 if (_location != _in_method) break; // only allow for methods 1749 if (!privileged) break; // only allow in privileged code 1750 return _method_CallerSensitive; 1751 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1752 if (_location != _in_method) break; // only allow for methods 1753 if (!privileged) break; // only allow in privileged code 1754 return _method_ForceInline; 1755 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1756 if (_location != _in_method) break; // only allow for methods 1757 if (!privileged) break; // only allow in privileged code 1758 return _method_DontInline; 1759 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): 1760 if (_location != _in_method) break; // only allow for methods 1761 if (!privileged) break; // only allow in privileged code 1762 return _method_InjectedProfile; 1763 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1764 if (_location != _in_method) break; // only allow for methods 1765 if (!privileged) break; // only allow in privileged code 1766 return _method_LambdaForm_Compiled; 1767 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1768 if (_location != _in_method) break; // only allow for methods 1769 if (!privileged) break; // only allow in privileged code 1770 return _method_LambdaForm_Hidden; 1771 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_internal_HotSpotIntrinsicCandidate_signature): 1772 if (_location != _in_method) break; // only allow for methods 1773 if (!privileged) break; // only allow in privileged code 1774 return _method_HotSpotIntrinsicCandidate; 1775 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_reflect_Accessor_signature): 1776 if (_location != _in_method) break; // only allow for methods 1777 return _method_Accessor_Method; 1778 #if INCLUDE_JVMCI 1779 case vmSymbols::VM_SYMBOL_ENUM_NAME(jdk_vm_ci_hotspot_Stable_signature): 1780 if (_location != _in_field) break; // only allow for fields 1781 if (!privileged) break; // only allow in privileged code 1782 return _field_Stable; 1783 #endif 1784 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): 1785 if (_location != _in_field) break; // only allow for fields 1786 if (!privileged) break; // only allow in privileged code 1787 return _field_Stable; 1788 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1789 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1790 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1791 return _sun_misc_Contended; 1792 default: break; 1793 } 1794 return AnnotationCollector::_unknown; 1795 } 1796 1797 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1798 if (is_contended()) 1799 f->set_contended_group(contended_group()); 1800 if (is_stable()) 1801 f->set_stable(true); 1802 } 1803 1804 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1805 // If there's an error deallocate metadata for field annotations 1806 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1807 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1808 } 1809 1810 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1811 if (has_annotation(_method_CallerSensitive)) 1812 m->set_caller_sensitive(true); 1813 if (has_annotation(_method_ForceInline)) 1814 m->set_force_inline(true); 1815 if (has_annotation(_method_DontInline)) 1816 m->set_dont_inline(true); 1817 if (has_annotation(_method_InjectedProfile)) 1818 m->set_has_injected_profile(true); 1819 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1820 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1821 if (has_annotation(_method_LambdaForm_Hidden)) 1822 m->set_hidden(true); 1823 if (has_annotation(_method_HotSpotIntrinsicCandidate) && !m->is_synthetic()) 1824 m->set_intrinsic_candidate(true); 1825 if (is_accessor()) { 1826 m->set_accessor_field_name(accessor_field_name()); 1827 } 1828 } 1829 1830 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1831 k->set_is_contended(is_contended()); 1832 } 1833 1834 1835 #define MAX_ARGS_SIZE 255 1836 #define MAX_CODE_SIZE 65535 1837 #define INITIAL_MAX_LVT_NUMBER 256 1838 1839 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1840 * 1841 * Rules for LVT's and LVTT's are: 1842 * - There can be any number of LVT's and LVTT's. 1843 * - If there are n LVT's, it is the same as if there was just 1844 * one LVT containing all the entries from the n LVT's. 1845 * - There may be no more than one LVT entry per local variable. 1846 * Two LVT entries are 'equal' if these fields are the same: 1847 * start_pc, length, name, slot 1848 * - There may be no more than one LVTT entry per each LVT entry. 1849 * Each LVTT entry has to match some LVT entry. 1850 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1851 */ 1852 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1853 int lvt_cnt, 1854 u2* localvariable_table_length, 1855 u2** localvariable_table_start, 1856 int lvtt_cnt, 1857 u2* localvariable_type_table_length, 1858 u2** localvariable_type_table_start, 1859 TRAPS) { 1860 1861 ResourceMark rm(THREAD); 1862 1863 typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*, 1864 &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable; 1865 1866 LVT_HashTable* table = new LVT_HashTable(); 1867 1868 // To fill LocalVariableTable in 1869 Classfile_LVT_Element* cf_lvt; 1870 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1871 1872 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1873 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1874 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1875 copy_lvt_element(&cf_lvt[idx], lvt); 1876 // If no duplicates, add LVT elem in hashtable. 1877 if (table->put(*lvt, lvt) == false 1878 && _need_verify 1879 && _major_version >= JAVA_1_5_VERSION) { 1880 classfile_parse_error("Duplicated LocalVariableTable attribute " 1881 "entry for '%s' in class file %s", 1882 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1883 CHECK); 1884 } 1885 } 1886 } 1887 1888 // To merge LocalVariableTable and LocalVariableTypeTable 1889 Classfile_LVT_Element* cf_lvtt; 1890 LocalVariableTableElement lvtt_elem; 1891 1892 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1893 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1894 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1895 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1896 LocalVariableTableElement** entry = table->get(lvtt_elem); 1897 if (entry == NULL) { 1898 if (_need_verify) { 1899 classfile_parse_error("LVTT entry for '%s' in class file %s " 1900 "does not match any LVT entry", 1901 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1902 CHECK); 1903 } 1904 } else if ((*entry)->signature_cp_index != 0 && _need_verify) { 1905 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1906 "entry for '%s' in class file %s", 1907 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1908 CHECK); 1909 } else { 1910 // to add generic signatures into LocalVariableTable 1911 (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; 1912 } 1913 } 1914 } 1915 } 1916 1917 1918 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1919 u1* runtime_visible_annotations, 1920 int runtime_visible_annotations_length, 1921 u1* runtime_invisible_annotations, 1922 int runtime_invisible_annotations_length, 1923 u1* runtime_visible_parameter_annotations, 1924 int runtime_visible_parameter_annotations_length, 1925 u1* runtime_invisible_parameter_annotations, 1926 int runtime_invisible_parameter_annotations_length, 1927 u1* runtime_visible_type_annotations, 1928 int runtime_visible_type_annotations_length, 1929 u1* runtime_invisible_type_annotations, 1930 int runtime_invisible_type_annotations_length, 1931 u1* annotation_default, 1932 int annotation_default_length, 1933 TRAPS) { 1934 1935 AnnotationArray* a; 1936 1937 if (runtime_visible_annotations_length + 1938 runtime_invisible_annotations_length > 0) { 1939 a = assemble_annotations(runtime_visible_annotations, 1940 runtime_visible_annotations_length, 1941 runtime_invisible_annotations, 1942 runtime_invisible_annotations_length, 1943 CHECK); 1944 cm->set_method_annotations(a); 1945 } 1946 1947 if (runtime_visible_parameter_annotations_length + 1948 runtime_invisible_parameter_annotations_length > 0) { 1949 a = assemble_annotations(runtime_visible_parameter_annotations, 1950 runtime_visible_parameter_annotations_length, 1951 runtime_invisible_parameter_annotations, 1952 runtime_invisible_parameter_annotations_length, 1953 CHECK); 1954 cm->set_parameter_annotations(a); 1955 } 1956 1957 if (annotation_default_length > 0) { 1958 a = assemble_annotations(annotation_default, 1959 annotation_default_length, 1960 NULL, 1961 0, 1962 CHECK); 1963 cm->set_default_annotations(a); 1964 } 1965 1966 if (runtime_visible_type_annotations_length + 1967 runtime_invisible_type_annotations_length > 0) { 1968 a = assemble_annotations(runtime_visible_type_annotations, 1969 runtime_visible_type_annotations_length, 1970 runtime_invisible_type_annotations, 1971 runtime_invisible_type_annotations_length, 1972 CHECK); 1973 cm->set_type_annotations(a); 1974 } 1975 } 1976 1977 1978 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1979 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1980 // Method* to save footprint, so we only know the size of the resulting Method* when the 1981 // entire method attribute is parsed. 1982 // 1983 // The promoted_flags parameter is used to pass relevant access_flags 1984 // from the method back up to the containing klass. These flag values 1985 // are added to klass's access_flags. 1986 1987 methodHandle ClassFileParser::parse_method(bool is_interface, 1988 AccessFlags *promoted_flags, 1989 TRAPS) { 1990 ClassFileStream* cfs = stream(); 1991 methodHandle nullHandle; 1992 ResourceMark rm(THREAD); 1993 // Parse fixed parts 1994 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1995 1996 int flags = cfs->get_u2_fast(); 1997 u2 name_index = cfs->get_u2_fast(); 1998 int cp_size = _cp->length(); 1999 check_property( 2000 valid_symbol_at(name_index), 2001 "Illegal constant pool index %u for method name in class file %s", 2002 name_index, CHECK_(nullHandle)); 2003 Symbol* name = _cp->symbol_at(name_index); 2004 verify_legal_method_name(name, CHECK_(nullHandle)); 2005 2006 u2 signature_index = cfs->get_u2_fast(); 2007 guarantee_property( 2008 valid_symbol_at(signature_index), 2009 "Illegal constant pool index %u for method signature in class file %s", 2010 signature_index, CHECK_(nullHandle)); 2011 Symbol* signature = _cp->symbol_at(signature_index); 2012 2013 AccessFlags access_flags; 2014 if (name == vmSymbols::class_initializer_name()) { 2015 // We ignore the other access flags for a valid class initializer. 2016 // (JVM Spec 2nd ed., chapter 4.6) 2017 if (_major_version < 51) { // backward compatibility 2018 flags = JVM_ACC_STATIC; 2019 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2020 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2021 } else { 2022 classfile_parse_error("Method <clinit> is not static in class file %s", CHECK_(nullHandle)); 2023 } 2024 } else { 2025 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2026 } 2027 2028 if (name == vmSymbols::object_initializer_name() && is_interface) { 2029 classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_(nullHandle)); 2030 } 2031 2032 int args_size = -1; // only used when _need_verify is true 2033 if (_need_verify) { 2034 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2035 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2036 if (args_size > MAX_ARGS_SIZE) { 2037 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2038 } 2039 } 2040 2041 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2042 2043 // Default values for code and exceptions attribute elements 2044 u2 max_stack = 0; 2045 u2 max_locals = 0; 2046 u4 code_length = 0; 2047 u1* code_start = 0; 2048 u2 exception_table_length = 0; 2049 u2* exception_table_start = NULL; 2050 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2051 u2 checked_exceptions_length = 0; 2052 u2* checked_exceptions_start = NULL; 2053 CompressedLineNumberWriteStream* linenumber_table = NULL; 2054 int linenumber_table_length = 0; 2055 int total_lvt_length = 0; 2056 u2 lvt_cnt = 0; 2057 u2 lvtt_cnt = 0; 2058 bool lvt_allocated = false; 2059 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2060 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2061 u2* localvariable_table_length = NULL; 2062 u2** localvariable_table_start = NULL; 2063 u2* localvariable_type_table_length = NULL; 2064 u2** localvariable_type_table_start = NULL; 2065 int method_parameters_length = -1; 2066 u1* method_parameters_data = NULL; 2067 bool method_parameters_seen = false; 2068 bool parsed_code_attribute = false; 2069 bool parsed_checked_exceptions_attribute = false; 2070 bool parsed_stackmap_attribute = false; 2071 // stackmap attribute - JDK1.5 2072 u1* stackmap_data = NULL; 2073 int stackmap_data_length = 0; 2074 u2 generic_signature_index = 0; 2075 MethodAnnotationCollector parsed_annotations; 2076 u1* runtime_visible_annotations = NULL; 2077 int runtime_visible_annotations_length = 0; 2078 u1* runtime_invisible_annotations = NULL; 2079 int runtime_invisible_annotations_length = 0; 2080 u1* runtime_visible_parameter_annotations = NULL; 2081 int runtime_visible_parameter_annotations_length = 0; 2082 u1* runtime_invisible_parameter_annotations = NULL; 2083 int runtime_invisible_parameter_annotations_length = 0; 2084 u1* runtime_visible_type_annotations = NULL; 2085 int runtime_visible_type_annotations_length = 0; 2086 u1* runtime_invisible_type_annotations = NULL; 2087 int runtime_invisible_type_annotations_length = 0; 2088 bool runtime_invisible_annotations_exists = false; 2089 bool runtime_invisible_type_annotations_exists = false; 2090 bool runtime_invisible_parameter_annotations_exists = false; 2091 u1* annotation_default = NULL; 2092 int annotation_default_length = 0; 2093 2094 // Parse code and exceptions attribute 2095 u2 method_attributes_count = cfs->get_u2_fast(); 2096 while (method_attributes_count--) { 2097 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2098 u2 method_attribute_name_index = cfs->get_u2_fast(); 2099 u4 method_attribute_length = cfs->get_u4_fast(); 2100 check_property( 2101 valid_symbol_at(method_attribute_name_index), 2102 "Invalid method attribute name index %u in class file %s", 2103 method_attribute_name_index, CHECK_(nullHandle)); 2104 2105 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2106 if (method_attribute_name == vmSymbols::tag_code()) { 2107 // Parse Code attribute 2108 if (_need_verify) { 2109 guarantee_property( 2110 !access_flags.is_native() && !access_flags.is_abstract(), 2111 "Code attribute in native or abstract methods in class file %s", 2112 CHECK_(nullHandle)); 2113 } 2114 if (parsed_code_attribute) { 2115 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2116 } 2117 parsed_code_attribute = true; 2118 2119 // Stack size, locals size, and code size 2120 if (_major_version == 45 && _minor_version <= 2) { 2121 cfs->guarantee_more(4, CHECK_(nullHandle)); 2122 max_stack = cfs->get_u1_fast(); 2123 max_locals = cfs->get_u1_fast(); 2124 code_length = cfs->get_u2_fast(); 2125 } else { 2126 cfs->guarantee_more(8, CHECK_(nullHandle)); 2127 max_stack = cfs->get_u2_fast(); 2128 max_locals = cfs->get_u2_fast(); 2129 code_length = cfs->get_u4_fast(); 2130 } 2131 if (_need_verify) { 2132 guarantee_property(args_size <= max_locals, 2133 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2134 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2135 "Invalid method Code length %u in class file %s", 2136 code_length, CHECK_(nullHandle)); 2137 } 2138 // Code pointer 2139 code_start = cfs->get_u1_buffer(); 2140 assert(code_start != NULL, "null code start"); 2141 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2142 cfs->skip_u1_fast(code_length); 2143 2144 // Exception handler table 2145 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2146 exception_table_length = cfs->get_u2_fast(); 2147 if (exception_table_length > 0) { 2148 exception_table_start = 2149 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2150 } 2151 2152 // Parse additional attributes in code attribute 2153 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2154 u2 code_attributes_count = cfs->get_u2_fast(); 2155 2156 unsigned int calculated_attribute_length = 0; 2157 2158 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2159 calculated_attribute_length = 2160 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2161 } else { 2162 // max_stack, locals and length are smaller in pre-version 45.2 classes 2163 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2164 } 2165 calculated_attribute_length += 2166 code_length + 2167 sizeof(exception_table_length) + 2168 sizeof(code_attributes_count) + 2169 exception_table_length * 2170 ( sizeof(u2) + // start_pc 2171 sizeof(u2) + // end_pc 2172 sizeof(u2) + // handler_pc 2173 sizeof(u2) ); // catch_type_index 2174 2175 while (code_attributes_count--) { 2176 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2177 u2 code_attribute_name_index = cfs->get_u2_fast(); 2178 u4 code_attribute_length = cfs->get_u4_fast(); 2179 calculated_attribute_length += code_attribute_length + 2180 sizeof(code_attribute_name_index) + 2181 sizeof(code_attribute_length); 2182 check_property(valid_symbol_at(code_attribute_name_index), 2183 "Invalid code attribute name index %u in class file %s", 2184 code_attribute_name_index, 2185 CHECK_(nullHandle)); 2186 if (LoadLineNumberTables && 2187 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2188 // Parse and compress line number table 2189 parse_linenumber_table(code_attribute_length, code_length, 2190 &linenumber_table, CHECK_(nullHandle)); 2191 2192 } else if (LoadLocalVariableTables && 2193 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2194 // Parse local variable table 2195 if (!lvt_allocated) { 2196 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2197 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2198 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2199 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2200 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2201 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2202 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2203 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2204 lvt_allocated = true; 2205 } 2206 if (lvt_cnt == max_lvt_cnt) { 2207 max_lvt_cnt <<= 1; 2208 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2209 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2210 } 2211 localvariable_table_start[lvt_cnt] = 2212 parse_localvariable_table(code_length, 2213 max_locals, 2214 code_attribute_length, 2215 &localvariable_table_length[lvt_cnt], 2216 false, // is not LVTT 2217 CHECK_(nullHandle)); 2218 total_lvt_length += localvariable_table_length[lvt_cnt]; 2219 lvt_cnt++; 2220 } else if (LoadLocalVariableTypeTables && 2221 _major_version >= JAVA_1_5_VERSION && 2222 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2223 if (!lvt_allocated) { 2224 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2225 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2226 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2227 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2228 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2229 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2230 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2231 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2232 lvt_allocated = true; 2233 } 2234 // Parse local variable type table 2235 if (lvtt_cnt == max_lvtt_cnt) { 2236 max_lvtt_cnt <<= 1; 2237 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2238 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2239 } 2240 localvariable_type_table_start[lvtt_cnt] = 2241 parse_localvariable_table(code_length, 2242 max_locals, 2243 code_attribute_length, 2244 &localvariable_type_table_length[lvtt_cnt], 2245 true, // is LVTT 2246 CHECK_(nullHandle)); 2247 lvtt_cnt++; 2248 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2249 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2250 // Stack map is only needed by the new verifier in JDK1.5. 2251 if (parsed_stackmap_attribute) { 2252 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2253 } 2254 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2255 stackmap_data_length = code_attribute_length; 2256 parsed_stackmap_attribute = true; 2257 } else { 2258 // Skip unknown attributes 2259 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2260 } 2261 } 2262 // check method attribute length 2263 if (_need_verify) { 2264 guarantee_property(method_attribute_length == calculated_attribute_length, 2265 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2266 } 2267 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2268 // Parse Exceptions attribute 2269 if (parsed_checked_exceptions_attribute) { 2270 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2271 } 2272 parsed_checked_exceptions_attribute = true; 2273 checked_exceptions_start = 2274 parse_checked_exceptions(&checked_exceptions_length, 2275 method_attribute_length, 2276 CHECK_(nullHandle)); 2277 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2278 // reject multiple method parameters 2279 if (method_parameters_seen) { 2280 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2281 } 2282 method_parameters_seen = true; 2283 method_parameters_length = cfs->get_u1_fast(); 2284 const u2 real_length = (method_parameters_length * 4u) + 1u; 2285 if (method_attribute_length != real_length) { 2286 classfile_parse_error( 2287 "Invalid MethodParameters method attribute length %u in class file", 2288 method_attribute_length, CHECK_(nullHandle)); 2289 } 2290 method_parameters_data = cfs->get_u1_buffer(); 2291 cfs->skip_u2_fast(method_parameters_length); 2292 cfs->skip_u2_fast(method_parameters_length); 2293 // ignore this attribute if it cannot be reflected 2294 if (!SystemDictionary::Parameter_klass_loaded()) 2295 method_parameters_length = -1; 2296 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2297 if (method_attribute_length != 0) { 2298 classfile_parse_error( 2299 "Invalid Synthetic method attribute length %u in class file %s", 2300 method_attribute_length, CHECK_(nullHandle)); 2301 } 2302 // Should we check that there hasn't already been a synthetic attribute? 2303 access_flags.set_is_synthetic(); 2304 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2305 if (method_attribute_length != 0) { 2306 classfile_parse_error( 2307 "Invalid Deprecated method attribute length %u in class file %s", 2308 method_attribute_length, CHECK_(nullHandle)); 2309 } 2310 } else if (_major_version >= JAVA_1_5_VERSION) { 2311 if (method_attribute_name == vmSymbols::tag_signature()) { 2312 if (method_attribute_length != 2) { 2313 classfile_parse_error( 2314 "Invalid Signature attribute length %u in class file %s", 2315 method_attribute_length, CHECK_(nullHandle)); 2316 } 2317 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); 2318 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2319 if (runtime_visible_annotations != NULL) { 2320 classfile_parse_error( 2321 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2322 } 2323 runtime_visible_annotations_length = method_attribute_length; 2324 runtime_visible_annotations = cfs->get_u1_buffer(); 2325 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2326 parse_annotations(runtime_visible_annotations, 2327 runtime_visible_annotations_length, &parsed_annotations); 2328 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2329 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2330 if (runtime_invisible_annotations_exists) { 2331 classfile_parse_error( 2332 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2333 } 2334 runtime_invisible_annotations_exists = true; 2335 if (PreserveAllAnnotations) { 2336 runtime_invisible_annotations_length = method_attribute_length; 2337 runtime_invisible_annotations = cfs->get_u1_buffer(); 2338 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2339 } 2340 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2341 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2342 if (runtime_visible_parameter_annotations != NULL) { 2343 classfile_parse_error( 2344 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2345 } 2346 runtime_visible_parameter_annotations_length = method_attribute_length; 2347 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2348 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2349 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2350 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2351 if (runtime_invisible_parameter_annotations_exists) { 2352 classfile_parse_error( 2353 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2354 } 2355 runtime_invisible_parameter_annotations_exists = true; 2356 if (PreserveAllAnnotations) { 2357 runtime_invisible_parameter_annotations_length = method_attribute_length; 2358 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2359 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2360 } 2361 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2362 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2363 if (annotation_default != NULL) { 2364 classfile_parse_error( 2365 "Multiple AnnotationDefault attributes for method in class file %s", 2366 CHECK_(nullHandle)); 2367 } 2368 annotation_default_length = method_attribute_length; 2369 annotation_default = cfs->get_u1_buffer(); 2370 assert(annotation_default != NULL, "null annotation default"); 2371 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2372 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2373 if (runtime_visible_type_annotations != NULL) { 2374 classfile_parse_error( 2375 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2376 CHECK_(nullHandle)); 2377 } 2378 runtime_visible_type_annotations_length = method_attribute_length; 2379 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2380 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2381 // No need for the VM to parse Type annotations 2382 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2383 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2384 if (runtime_invisible_type_annotations_exists) { 2385 classfile_parse_error( 2386 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2387 CHECK_(nullHandle)); 2388 } else { 2389 runtime_invisible_type_annotations_exists = true; 2390 } 2391 if (PreserveAllAnnotations) { 2392 runtime_invisible_type_annotations_length = method_attribute_length; 2393 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2394 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2395 } 2396 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2397 } else { 2398 // Skip unknown attributes 2399 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2400 } 2401 } else { 2402 // Skip unknown attributes 2403 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2404 } 2405 } 2406 2407 if (linenumber_table != NULL) { 2408 linenumber_table->write_terminator(); 2409 linenumber_table_length = linenumber_table->position(); 2410 } 2411 2412 // Make sure there's at least one Code attribute in non-native/non-abstract method 2413 if (_need_verify) { 2414 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2415 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2416 } 2417 2418 // All sizing information for a Method* is finally available, now create it 2419 InlineTableSizes sizes( 2420 total_lvt_length, 2421 linenumber_table_length, 2422 exception_table_length, 2423 checked_exceptions_length, 2424 method_parameters_length, 2425 generic_signature_index, 2426 runtime_visible_annotations_length + 2427 runtime_invisible_annotations_length, 2428 runtime_visible_parameter_annotations_length + 2429 runtime_invisible_parameter_annotations_length, 2430 runtime_visible_type_annotations_length + 2431 runtime_invisible_type_annotations_length, 2432 annotation_default_length, 2433 0); 2434 2435 Method* m = Method::allocate( 2436 _loader_data, code_length, access_flags, &sizes, 2437 ConstMethod::NORMAL, CHECK_(nullHandle)); 2438 2439 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2440 2441 // Fill in information from fixed part (access_flags already set) 2442 m->set_constants(_cp); 2443 m->set_name_index(name_index); 2444 m->set_signature_index(signature_index); 2445 #ifdef CC_INTERP 2446 // hmm is there a gc issue here?? 2447 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2448 m->set_result_index(rtf.type()); 2449 #endif 2450 2451 if (args_size >= 0) { 2452 m->set_size_of_parameters(args_size); 2453 } else { 2454 m->compute_size_of_parameters(THREAD); 2455 } 2456 #ifdef ASSERT 2457 if (args_size >= 0) { 2458 m->compute_size_of_parameters(THREAD); 2459 assert(args_size == m->size_of_parameters(), ""); 2460 } 2461 #endif 2462 2463 // Fill in code attribute information 2464 m->set_max_stack(max_stack); 2465 m->set_max_locals(max_locals); 2466 if (stackmap_data != NULL) { 2467 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2468 stackmap_data_length, CHECK_NULL); 2469 } 2470 2471 // Copy byte codes 2472 m->set_code(code_start); 2473 2474 // Copy line number table 2475 if (linenumber_table != NULL) { 2476 memcpy(m->compressed_linenumber_table(), 2477 linenumber_table->buffer(), linenumber_table_length); 2478 } 2479 2480 // Copy exception table 2481 if (exception_table_length > 0) { 2482 int size = 2483 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2484 copy_u2_with_conversion((u2*) m->exception_table_start(), 2485 exception_table_start, size); 2486 } 2487 2488 // Copy method parameters 2489 if (method_parameters_length > 0) { 2490 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2491 for (int i = 0; i < method_parameters_length; i++) { 2492 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2493 method_parameters_data += 2; 2494 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2495 method_parameters_data += 2; 2496 } 2497 } 2498 2499 // Copy checked exceptions 2500 if (checked_exceptions_length > 0) { 2501 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2502 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2503 } 2504 2505 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2506 if (total_lvt_length > 0) { 2507 promoted_flags->set_has_localvariable_table(); 2508 copy_localvariable_table(m->constMethod(), lvt_cnt, 2509 localvariable_table_length, 2510 localvariable_table_start, 2511 lvtt_cnt, 2512 localvariable_type_table_length, 2513 localvariable_type_table_start, CHECK_NULL); 2514 } 2515 2516 if (parsed_annotations.has_any_annotations()) 2517 parsed_annotations.apply_to(m); 2518 2519 // Copy annotations 2520 copy_method_annotations(m->constMethod(), 2521 runtime_visible_annotations, 2522 runtime_visible_annotations_length, 2523 runtime_invisible_annotations, 2524 runtime_invisible_annotations_length, 2525 runtime_visible_parameter_annotations, 2526 runtime_visible_parameter_annotations_length, 2527 runtime_invisible_parameter_annotations, 2528 runtime_invisible_parameter_annotations_length, 2529 runtime_visible_type_annotations, 2530 runtime_visible_type_annotations_length, 2531 runtime_invisible_type_annotations, 2532 runtime_invisible_type_annotations_length, 2533 annotation_default, 2534 annotation_default_length, 2535 CHECK_NULL); 2536 2537 if (name == vmSymbols::finalize_method_name() && 2538 signature == vmSymbols::void_method_signature()) { 2539 if (m->is_empty_method()) { 2540 _has_empty_finalizer = true; 2541 } else { 2542 _has_finalizer = true; 2543 } 2544 } 2545 if (name == vmSymbols::object_initializer_name() && 2546 signature == vmSymbols::void_method_signature() && 2547 m->is_vanilla_constructor()) { 2548 _has_vanilla_constructor = true; 2549 } 2550 2551 NOT_PRODUCT(m->verify()); 2552 return m; 2553 } 2554 2555 2556 // The promoted_flags parameter is used to pass relevant access_flags 2557 // from the methods back up to the containing klass. These flag values 2558 // are added to klass's access_flags. 2559 2560 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2561 AccessFlags* promoted_flags, 2562 bool* has_final_method, 2563 bool* declares_default_methods, 2564 TRAPS) { 2565 ClassFileStream* cfs = stream(); 2566 cfs->guarantee_more(2, CHECK_NULL); // length 2567 u2 length = cfs->get_u2_fast(); 2568 if (length == 0) { 2569 _methods = Universe::the_empty_method_array(); 2570 } else { 2571 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2572 2573 HandleMark hm(THREAD); 2574 for (int index = 0; index < length; index++) { 2575 methodHandle method = parse_method(is_interface, 2576 promoted_flags, 2577 CHECK_NULL); 2578 2579 if (method->is_final()) { 2580 *has_final_method = true; 2581 } 2582 // declares_default_methods: declares concrete instance methods, any access flags 2583 // used for interface initialization, and default method inheritance analysis 2584 if (is_interface && !(*declares_default_methods) 2585 && !method->is_abstract() && !method->is_static()) { 2586 *declares_default_methods = true; 2587 } 2588 _methods->at_put(index, method()); 2589 } 2590 2591 if (_need_verify && length > 1) { 2592 // Check duplicated methods 2593 ResourceMark rm(THREAD); 2594 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2595 THREAD, NameSigHash*, HASH_ROW_SIZE); 2596 initialize_hashtable(names_and_sigs); 2597 bool dup = false; 2598 { 2599 debug_only(No_Safepoint_Verifier nsv;) 2600 for (int i = 0; i < length; i++) { 2601 Method* m = _methods->at(i); 2602 // If no duplicates, add name/signature in hashtable names_and_sigs. 2603 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2604 dup = true; 2605 break; 2606 } 2607 } 2608 } 2609 if (dup) { 2610 classfile_parse_error("Duplicate method name&signature in class file %s", 2611 CHECK_NULL); 2612 } 2613 } 2614 } 2615 return _methods; 2616 } 2617 2618 2619 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2620 int length = methods->length(); 2621 // If JVMTI original method ordering or sharing is enabled we have to 2622 // remember the original class file ordering. 2623 // We temporarily use the vtable_index field in the Method* to store the 2624 // class file index, so we can read in after calling qsort. 2625 // Put the method ordering in the shared archive. 2626 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2627 for (int index = 0; index < length; index++) { 2628 Method* m = methods->at(index); 2629 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2630 m->set_vtable_index(index); 2631 } 2632 } 2633 // Sort method array by ascending method name (for faster lookups & vtable construction) 2634 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2635 Method::sort_methods(methods); 2636 2637 intArray* method_ordering = NULL; 2638 // If JVMTI original method ordering or sharing is enabled construct int 2639 // array remembering the original ordering 2640 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2641 method_ordering = new intArray(length); 2642 for (int index = 0; index < length; index++) { 2643 Method* m = methods->at(index); 2644 int old_index = m->vtable_index(); 2645 assert(old_index >= 0 && old_index < length, "invalid method index"); 2646 method_ordering->at_put(index, old_index); 2647 m->set_vtable_index(Method::invalid_vtable_index); 2648 } 2649 } 2650 return method_ordering; 2651 } 2652 2653 // Parse generic_signature attribute for methods and fields 2654 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { 2655 ClassFileStream* cfs = stream(); 2656 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2657 u2 generic_signature_index = cfs->get_u2_fast(); 2658 check_property( 2659 valid_symbol_at(generic_signature_index), 2660 "Invalid Signature attribute at constant pool index %u in class file %s", 2661 generic_signature_index, CHECK_0); 2662 return generic_signature_index; 2663 } 2664 2665 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2666 ClassFileStream* cfs = stream(); 2667 cfs->guarantee_more(2, CHECK); // sourcefile_index 2668 u2 sourcefile_index = cfs->get_u2_fast(); 2669 check_property( 2670 valid_symbol_at(sourcefile_index), 2671 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2672 sourcefile_index, CHECK); 2673 set_class_sourcefile_index(sourcefile_index); 2674 } 2675 2676 2677 2678 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2679 ClassFileStream* cfs = stream(); 2680 u1* sde_buffer = cfs->get_u1_buffer(); 2681 assert(sde_buffer != NULL, "null sde buffer"); 2682 2683 // Don't bother storing it if there is no way to retrieve it 2684 if (JvmtiExport::can_get_source_debug_extension()) { 2685 assert((length+1) > length, "Overflow checking"); 2686 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2687 for (int i = 0; i < length; i++) { 2688 sde[i] = sde_buffer[i]; 2689 } 2690 sde[length] = '\0'; 2691 set_class_sde_buffer((char*)sde, length); 2692 } 2693 // Got utf8 string, set stream position forward 2694 cfs->skip_u1(length, CHECK); 2695 } 2696 2697 2698 // Inner classes can be static, private or protected (classic VM does this) 2699 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2700 2701 // Return number of classes in the inner classes attribute table 2702 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2703 bool parsed_enclosingmethod_attribute, 2704 u2 enclosing_method_class_index, 2705 u2 enclosing_method_method_index, 2706 TRAPS) { 2707 ClassFileStream* cfs = stream(); 2708 u1* current_mark = cfs->current(); 2709 u2 length = 0; 2710 if (inner_classes_attribute_start != NULL) { 2711 cfs->set_current(inner_classes_attribute_start); 2712 cfs->guarantee_more(2, CHECK_0); // length 2713 length = cfs->get_u2_fast(); 2714 } 2715 2716 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2717 // method data: 2718 // [inner_class_info_index, 2719 // outer_class_info_index, 2720 // inner_name_index, 2721 // inner_class_access_flags, 2722 // ... 2723 // enclosing_method_class_index, 2724 // enclosing_method_method_index] 2725 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2726 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2727 _inner_classes = inner_classes; 2728 2729 int index = 0; 2730 int cp_size = _cp->length(); 2731 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2732 for (int n = 0; n < length; n++) { 2733 // Inner class index 2734 u2 inner_class_info_index = cfs->get_u2_fast(); 2735 check_property( 2736 valid_klass_reference_at(inner_class_info_index), 2737 "inner_class_info_index %u has bad constant type in class file %s", 2738 inner_class_info_index, CHECK_0); 2739 // Outer class index 2740 u2 outer_class_info_index = cfs->get_u2_fast(); 2741 check_property( 2742 outer_class_info_index == 0 || 2743 valid_klass_reference_at(outer_class_info_index), 2744 "outer_class_info_index %u has bad constant type in class file %s", 2745 outer_class_info_index, CHECK_0); 2746 // Inner class name 2747 u2 inner_name_index = cfs->get_u2_fast(); 2748 check_property( 2749 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2750 "inner_name_index %u has bad constant type in class file %s", 2751 inner_name_index, CHECK_0); 2752 if (_need_verify) { 2753 guarantee_property(inner_class_info_index != outer_class_info_index, 2754 "Class is both outer and inner class in class file %s", CHECK_0); 2755 } 2756 // Access flags 2757 AccessFlags inner_access_flags; 2758 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2759 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2760 // Set abstract bit for old class files for backward compatibility 2761 flags |= JVM_ACC_ABSTRACT; 2762 } 2763 verify_legal_class_modifiers(flags, CHECK_0); 2764 inner_access_flags.set_flags(flags); 2765 2766 inner_classes->at_put(index++, inner_class_info_index); 2767 inner_classes->at_put(index++, outer_class_info_index); 2768 inner_classes->at_put(index++, inner_name_index); 2769 inner_classes->at_put(index++, inner_access_flags.as_short()); 2770 } 2771 2772 // 4347400: make sure there's no duplicate entry in the classes array 2773 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2774 for(int i = 0; i < length * 4; i += 4) { 2775 for(int j = i + 4; j < length * 4; j += 4) { 2776 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2777 inner_classes->at(i+1) != inner_classes->at(j+1) || 2778 inner_classes->at(i+2) != inner_classes->at(j+2) || 2779 inner_classes->at(i+3) != inner_classes->at(j+3)), 2780 "Duplicate entry in InnerClasses in class file %s", 2781 CHECK_0); 2782 } 2783 } 2784 } 2785 2786 // Set EnclosingMethod class and method indexes. 2787 if (parsed_enclosingmethod_attribute) { 2788 inner_classes->at_put(index++, enclosing_method_class_index); 2789 inner_classes->at_put(index++, enclosing_method_method_index); 2790 } 2791 assert(index == size, "wrong size"); 2792 2793 // Restore buffer's current position. 2794 cfs->set_current(current_mark); 2795 2796 return length; 2797 } 2798 2799 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2800 set_class_synthetic_flag(true); 2801 } 2802 2803 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2804 ClassFileStream* cfs = stream(); 2805 u2 signature_index = cfs->get_u2(CHECK); 2806 check_property( 2807 valid_symbol_at(signature_index), 2808 "Invalid constant pool index %u in Signature attribute in class file %s", 2809 signature_index, CHECK); 2810 set_class_generic_signature_index(signature_index); 2811 } 2812 2813 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2814 ClassFileStream* cfs = stream(); 2815 u1* current_start = cfs->current(); 2816 2817 guarantee_property(attribute_byte_length >= sizeof(u2), 2818 "Invalid BootstrapMethods attribute length %u in class file %s", 2819 attribute_byte_length, 2820 CHECK); 2821 2822 cfs->guarantee_more(attribute_byte_length, CHECK); 2823 2824 int attribute_array_length = cfs->get_u2_fast(); 2825 2826 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2827 "Short length on BootstrapMethods in class file %s", 2828 CHECK); 2829 2830 2831 // The attribute contains a counted array of counted tuples of shorts, 2832 // represending bootstrap specifiers: 2833 // length*{bootstrap_method_index, argument_count*{argument_index}} 2834 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2835 // operand_count = number of shorts in attr, except for leading length 2836 2837 // The attribute is copied into a short[] array. 2838 // The array begins with a series of short[2] pairs, one for each tuple. 2839 int index_size = (attribute_array_length * 2); 2840 2841 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2842 2843 // Eagerly assign operands so they will be deallocated with the constant 2844 // pool if there is an error. 2845 _cp->set_operands(operands); 2846 2847 int operand_fill_index = index_size; 2848 int cp_size = _cp->length(); 2849 2850 for (int n = 0; n < attribute_array_length; n++) { 2851 // Store a 32-bit offset into the header of the operand array. 2852 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2853 2854 // Read a bootstrap specifier. 2855 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2856 u2 bootstrap_method_index = cfs->get_u2_fast(); 2857 u2 argument_count = cfs->get_u2_fast(); 2858 check_property( 2859 valid_cp_range(bootstrap_method_index, cp_size) && 2860 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2861 "bootstrap_method_index %u has bad constant type in class file %s", 2862 bootstrap_method_index, 2863 CHECK); 2864 2865 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 2866 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 2867 CHECK); 2868 2869 operands->at_put(operand_fill_index++, bootstrap_method_index); 2870 operands->at_put(operand_fill_index++, argument_count); 2871 2872 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2873 for (int j = 0; j < argument_count; j++) { 2874 u2 argument_index = cfs->get_u2_fast(); 2875 check_property( 2876 valid_cp_range(argument_index, cp_size) && 2877 _cp->tag_at(argument_index).is_loadable_constant(), 2878 "argument_index %u has bad constant type in class file %s", 2879 argument_index, 2880 CHECK); 2881 operands->at_put(operand_fill_index++, argument_index); 2882 } 2883 } 2884 2885 u1* current_end = cfs->current(); 2886 guarantee_property(current_end == current_start + attribute_byte_length, 2887 "Bad length on BootstrapMethods in class file %s", 2888 CHECK); 2889 } 2890 2891 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2892 TRAPS) { 2893 ClassFileStream* cfs = stream(); 2894 // Set inner classes attribute to default sentinel 2895 _inner_classes = Universe::the_empty_short_array(); 2896 cfs->guarantee_more(2, CHECK); // attributes_count 2897 u2 attributes_count = cfs->get_u2_fast(); 2898 bool parsed_sourcefile_attribute = false; 2899 bool parsed_innerclasses_attribute = false; 2900 bool parsed_enclosingmethod_attribute = false; 2901 bool parsed_bootstrap_methods_attribute = false; 2902 u1* runtime_visible_annotations = NULL; 2903 int runtime_visible_annotations_length = 0; 2904 u1* runtime_invisible_annotations = NULL; 2905 int runtime_invisible_annotations_length = 0; 2906 u1* runtime_visible_type_annotations = NULL; 2907 int runtime_visible_type_annotations_length = 0; 2908 u1* runtime_invisible_type_annotations = NULL; 2909 int runtime_invisible_type_annotations_length = 0; 2910 bool runtime_invisible_type_annotations_exists = false; 2911 bool runtime_invisible_annotations_exists = false; 2912 bool parsed_source_debug_ext_annotations_exist = false; 2913 u1* inner_classes_attribute_start = NULL; 2914 u4 inner_classes_attribute_length = 0; 2915 u2 enclosing_method_class_index = 0; 2916 u2 enclosing_method_method_index = 0; 2917 // Iterate over attributes 2918 while (attributes_count--) { 2919 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2920 u2 attribute_name_index = cfs->get_u2_fast(); 2921 u4 attribute_length = cfs->get_u4_fast(); 2922 check_property( 2923 valid_symbol_at(attribute_name_index), 2924 "Attribute name has bad constant pool index %u in class file %s", 2925 attribute_name_index, CHECK); 2926 Symbol* tag = _cp->symbol_at(attribute_name_index); 2927 if (tag == vmSymbols::tag_source_file()) { 2928 // Check for SourceFile tag 2929 if (_need_verify) { 2930 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2931 } 2932 if (parsed_sourcefile_attribute) { 2933 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2934 } else { 2935 parsed_sourcefile_attribute = true; 2936 } 2937 parse_classfile_sourcefile_attribute(CHECK); 2938 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2939 // Check for SourceDebugExtension tag 2940 if (parsed_source_debug_ext_annotations_exist) { 2941 classfile_parse_error( 2942 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 2943 } 2944 parsed_source_debug_ext_annotations_exist = true; 2945 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2946 } else if (tag == vmSymbols::tag_inner_classes()) { 2947 // Check for InnerClasses tag 2948 if (parsed_innerclasses_attribute) { 2949 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2950 } else { 2951 parsed_innerclasses_attribute = true; 2952 } 2953 inner_classes_attribute_start = cfs->get_u1_buffer(); 2954 inner_classes_attribute_length = attribute_length; 2955 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2956 } else if (tag == vmSymbols::tag_synthetic()) { 2957 // Check for Synthetic tag 2958 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2959 if (attribute_length != 0) { 2960 classfile_parse_error( 2961 "Invalid Synthetic classfile attribute length %u in class file %s", 2962 attribute_length, CHECK); 2963 } 2964 parse_classfile_synthetic_attribute(CHECK); 2965 } else if (tag == vmSymbols::tag_deprecated()) { 2966 // Check for Deprecatd tag - 4276120 2967 if (attribute_length != 0) { 2968 classfile_parse_error( 2969 "Invalid Deprecated classfile attribute length %u in class file %s", 2970 attribute_length, CHECK); 2971 } 2972 } else if (_major_version >= JAVA_1_5_VERSION) { 2973 if (tag == vmSymbols::tag_signature()) { 2974 if (attribute_length != 2) { 2975 classfile_parse_error( 2976 "Wrong Signature attribute length %u in class file %s", 2977 attribute_length, CHECK); 2978 } 2979 parse_classfile_signature_attribute(CHECK); 2980 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2981 if (runtime_visible_annotations != NULL) { 2982 classfile_parse_error( 2983 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 2984 } 2985 runtime_visible_annotations_length = attribute_length; 2986 runtime_visible_annotations = cfs->get_u1_buffer(); 2987 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2988 parse_annotations(runtime_visible_annotations, 2989 runtime_visible_annotations_length, 2990 parsed_annotations); 2991 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2992 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 2993 if (runtime_invisible_annotations_exists) { 2994 classfile_parse_error( 2995 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 2996 } 2997 runtime_invisible_annotations_exists = true; 2998 if (PreserveAllAnnotations) { 2999 runtime_invisible_annotations_length = attribute_length; 3000 runtime_invisible_annotations = cfs->get_u1_buffer(); 3001 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3002 } 3003 cfs->skip_u1(attribute_length, CHECK); 3004 } else if (tag == vmSymbols::tag_enclosing_method()) { 3005 if (parsed_enclosingmethod_attribute) { 3006 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3007 } else { 3008 parsed_enclosingmethod_attribute = true; 3009 } 3010 guarantee_property(attribute_length == 4, 3011 "Wrong EnclosingMethod attribute length %u in class file %s", 3012 attribute_length, CHECK); 3013 cfs->guarantee_more(4, CHECK); // class_index, method_index 3014 enclosing_method_class_index = cfs->get_u2_fast(); 3015 enclosing_method_method_index = cfs->get_u2_fast(); 3016 if (enclosing_method_class_index == 0) { 3017 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3018 } 3019 // Validate the constant pool indices and types 3020 check_property(valid_klass_reference_at(enclosing_method_class_index), 3021 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3022 if (enclosing_method_method_index != 0 && 3023 (!_cp->is_within_bounds(enclosing_method_method_index) || 3024 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3025 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3026 } 3027 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3028 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3029 if (parsed_bootstrap_methods_attribute) 3030 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3031 parsed_bootstrap_methods_attribute = true; 3032 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 3033 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3034 if (runtime_visible_type_annotations != NULL) { 3035 classfile_parse_error( 3036 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3037 } 3038 runtime_visible_type_annotations_length = attribute_length; 3039 runtime_visible_type_annotations = cfs->get_u1_buffer(); 3040 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3041 // No need for the VM to parse Type annotations 3042 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3043 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3044 if (runtime_invisible_type_annotations_exists) { 3045 classfile_parse_error( 3046 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3047 } else { 3048 runtime_invisible_type_annotations_exists = true; 3049 } 3050 if (PreserveAllAnnotations) { 3051 runtime_invisible_type_annotations_length = attribute_length; 3052 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3053 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3054 } 3055 cfs->skip_u1(attribute_length, CHECK); 3056 } else { 3057 // Unknown attribute 3058 cfs->skip_u1(attribute_length, CHECK); 3059 } 3060 } else { 3061 // Unknown attribute 3062 cfs->skip_u1(attribute_length, CHECK); 3063 } 3064 } 3065 _annotations = assemble_annotations(runtime_visible_annotations, 3066 runtime_visible_annotations_length, 3067 runtime_invisible_annotations, 3068 runtime_invisible_annotations_length, 3069 CHECK); 3070 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3071 runtime_visible_type_annotations_length, 3072 runtime_invisible_type_annotations, 3073 runtime_invisible_type_annotations_length, 3074 CHECK); 3075 3076 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3077 u2 num_of_classes = parse_classfile_inner_classes_attribute( 3078 inner_classes_attribute_start, 3079 parsed_innerclasses_attribute, 3080 enclosing_method_class_index, 3081 enclosing_method_method_index, 3082 CHECK); 3083 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3084 guarantee_property( 3085 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3086 "Wrong InnerClasses attribute length in class file %s", CHECK); 3087 } 3088 } 3089 3090 if (_max_bootstrap_specifier_index >= 0) { 3091 guarantee_property(parsed_bootstrap_methods_attribute, 3092 "Missing BootstrapMethods attribute in class file %s", CHECK); 3093 } 3094 } 3095 3096 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 3097 if (_synthetic_flag) 3098 k->set_is_synthetic(); 3099 if (_sourcefile_index != 0) { 3100 k->set_source_file_name_index(_sourcefile_index); 3101 } 3102 if (_generic_signature_index != 0) { 3103 k->set_generic_signature_index(_generic_signature_index); 3104 } 3105 if (_sde_buffer != NULL) { 3106 k->set_source_debug_extension(_sde_buffer, _sde_length); 3107 } 3108 } 3109 3110 // Create the Annotations object that will 3111 // hold the annotations array for the Klass. 3112 void ClassFileParser::create_combined_annotations(TRAPS) { 3113 if (_annotations == NULL && 3114 _type_annotations == NULL && 3115 _fields_annotations == NULL && 3116 _fields_type_annotations == NULL) { 3117 // Don't create the Annotations object unnecessarily. 3118 return; 3119 } 3120 3121 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3122 annotations->set_class_annotations(_annotations); 3123 annotations->set_class_type_annotations(_type_annotations); 3124 annotations->set_fields_annotations(_fields_annotations); 3125 annotations->set_fields_type_annotations(_fields_type_annotations); 3126 3127 // This is the Annotations object that will be 3128 // assigned to InstanceKlass being constructed. 3129 _combined_annotations = annotations; 3130 3131 // The annotations arrays below has been transfered the 3132 // _combined_annotations so these fields can now be cleared. 3133 _annotations = NULL; 3134 _type_annotations = NULL; 3135 _fields_annotations = NULL; 3136 _fields_type_annotations = NULL; 3137 } 3138 3139 // Transfer ownership of metadata allocated to the InstanceKlass. 3140 void ClassFileParser::apply_parsed_class_metadata( 3141 instanceKlassHandle this_klass, 3142 int java_fields_count, TRAPS) { 3143 _cp->set_pool_holder(this_klass()); 3144 this_klass->set_constants(_cp); 3145 this_klass->set_fields(_fields, java_fields_count); 3146 this_klass->set_methods(_methods); 3147 this_klass->set_inner_classes(_inner_classes); 3148 this_klass->set_local_interfaces(_local_interfaces); 3149 this_klass->set_transitive_interfaces(_transitive_interfaces); 3150 this_klass->set_annotations(_combined_annotations); 3151 3152 // Clear out these fields so they don't get deallocated by the destructor 3153 clear_class_metadata(); 3154 } 3155 3156 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3157 int runtime_visible_annotations_length, 3158 u1* runtime_invisible_annotations, 3159 int runtime_invisible_annotations_length, TRAPS) { 3160 AnnotationArray* annotations = NULL; 3161 if (runtime_visible_annotations != NULL || 3162 runtime_invisible_annotations != NULL) { 3163 annotations = MetadataFactory::new_array<u1>(_loader_data, 3164 runtime_visible_annotations_length + 3165 runtime_invisible_annotations_length, 3166 CHECK_(annotations)); 3167 if (runtime_visible_annotations != NULL) { 3168 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3169 annotations->at_put(i, runtime_visible_annotations[i]); 3170 } 3171 } 3172 if (runtime_invisible_annotations != NULL) { 3173 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3174 int append = runtime_visible_annotations_length+i; 3175 annotations->at_put(append, runtime_invisible_annotations[i]); 3176 } 3177 } 3178 } 3179 return annotations; 3180 } 3181 3182 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3183 TRAPS) { 3184 instanceKlassHandle super_klass; 3185 if (super_class_index == 0) { 3186 check_property(_class_name == vmSymbols::java_lang_Object(), 3187 "Invalid superclass index %u in class file %s", 3188 super_class_index, 3189 CHECK_NULL); 3190 } else { 3191 check_property(valid_klass_reference_at(super_class_index), 3192 "Invalid superclass index %u in class file %s", 3193 super_class_index, 3194 CHECK_NULL); 3195 // The class name should be legal because it is checked when parsing constant pool. 3196 // However, make sure it is not an array type. 3197 bool is_array = false; 3198 if (_cp->tag_at(super_class_index).is_klass()) { 3199 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3200 if (_need_verify) { 3201 is_array = super_klass->is_array_klass(); 3202 } 3203 } else if (_need_verify) { 3204 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3205 } 3206 if (_need_verify) { 3207 guarantee_property(!is_array, 3208 "Bad superclass name in class file %s", CHECK_NULL); 3209 } 3210 } 3211 return super_klass; 3212 } 3213 3214 3215 // Values needed for oopmap and InstanceKlass creation 3216 class FieldLayoutInfo : public StackObj { 3217 public: 3218 int* nonstatic_oop_offsets; 3219 unsigned int* nonstatic_oop_counts; 3220 unsigned int nonstatic_oop_map_count; 3221 unsigned int total_oop_map_count; 3222 int instance_size; 3223 int nonstatic_field_size; 3224 int static_field_size; 3225 bool has_nonstatic_fields; 3226 }; 3227 3228 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3229 void ClassFileParser::layout_fields(Handle class_loader, 3230 FieldAllocationCount* fac, 3231 ClassAnnotationCollector* parsed_annotations, 3232 FieldLayoutInfo* info, 3233 TRAPS) { 3234 3235 // Field size and offset computation 3236 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3237 int next_static_oop_offset = 0; 3238 int next_static_double_offset = 0; 3239 int next_static_word_offset = 0; 3240 int next_static_short_offset = 0; 3241 int next_static_byte_offset = 0; 3242 int next_nonstatic_oop_offset = 0; 3243 int next_nonstatic_double_offset = 0; 3244 int next_nonstatic_word_offset = 0; 3245 int next_nonstatic_short_offset = 0; 3246 int next_nonstatic_byte_offset = 0; 3247 int first_nonstatic_oop_offset = 0; 3248 int next_nonstatic_field_offset = 0; 3249 int next_nonstatic_padded_offset = 0; 3250 3251 // Count the contended fields by type. 3252 // 3253 // We ignore static fields, because @Contended is not supported for them. 3254 // The layout code below will also ignore the static fields. 3255 int nonstatic_contended_count = 0; 3256 FieldAllocationCount fac_contended; 3257 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3258 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3259 if (fs.is_contended()) { 3260 fac_contended.count[atype]++; 3261 if (!fs.access_flags().is_static()) { 3262 nonstatic_contended_count++; 3263 } 3264 } 3265 } 3266 3267 3268 // Calculate the starting byte offsets 3269 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3270 next_static_double_offset = next_static_oop_offset + 3271 ((fac->count[STATIC_OOP]) * heapOopSize); 3272 if ( fac->count[STATIC_DOUBLE] && 3273 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3274 Universe::field_type_should_be_aligned(T_LONG)) ) { 3275 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3276 } 3277 3278 next_static_word_offset = next_static_double_offset + 3279 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3280 next_static_short_offset = next_static_word_offset + 3281 ((fac->count[STATIC_WORD]) * BytesPerInt); 3282 next_static_byte_offset = next_static_short_offset + 3283 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3284 3285 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3286 nonstatic_field_size * heapOopSize; 3287 3288 next_nonstatic_field_offset = nonstatic_fields_start; 3289 3290 bool is_contended_class = parsed_annotations->is_contended(); 3291 3292 // Class is contended, pad before all the fields 3293 if (is_contended_class) { 3294 next_nonstatic_field_offset += ContendedPaddingWidth; 3295 } 3296 3297 // Compute the non-contended fields count. 3298 // The packing code below relies on these counts to determine if some field 3299 // can be squeezed into the alignment gap. Contended fields are obviously 3300 // exempt from that. 3301 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3302 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3303 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3304 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3305 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3306 3307 // Total non-static fields count, including every contended field 3308 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3309 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3310 fac->count[NONSTATIC_OOP]; 3311 3312 bool super_has_nonstatic_fields = 3313 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3314 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3315 3316 3317 // Prepare list of oops for oop map generation. 3318 // 3319 // "offset" and "count" lists are describing the set of contiguous oop 3320 // regions. offset[i] is the start of the i-th region, which then has 3321 // count[i] oops following. Before we know how many regions are required, 3322 // we pessimistically allocate the maps to fit all the oops into the 3323 // distinct regions. 3324 // 3325 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3326 // to figure out if we still need to do this. 3327 int* nonstatic_oop_offsets; 3328 unsigned int* nonstatic_oop_counts; 3329 unsigned int nonstatic_oop_map_count = 0; 3330 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3331 3332 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3333 THREAD, int, max_nonstatic_oop_maps); 3334 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3335 THREAD, unsigned int, max_nonstatic_oop_maps); 3336 3337 first_nonstatic_oop_offset = 0; // will be set for first oop field 3338 3339 bool compact_fields = CompactFields; 3340 int allocation_style = FieldsAllocationStyle; 3341 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3342 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3343 allocation_style = 1; // Optimistic 3344 } 3345 3346 // The next classes have predefined hard-coded fields offsets 3347 // (see in JavaClasses::compute_hard_coded_offsets()). 3348 // Use default fields allocation order for them. 3349 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3350 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3351 _class_name == vmSymbols::java_lang_Class() || 3352 _class_name == vmSymbols::java_lang_ClassLoader() || 3353 _class_name == vmSymbols::java_lang_ref_Reference() || 3354 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3355 _class_name == vmSymbols::java_lang_StackTraceElement() || 3356 _class_name == vmSymbols::java_lang_String() || 3357 _class_name == vmSymbols::java_lang_Throwable() || 3358 _class_name == vmSymbols::java_lang_Boolean() || 3359 _class_name == vmSymbols::java_lang_Character() || 3360 _class_name == vmSymbols::java_lang_Float() || 3361 _class_name == vmSymbols::java_lang_Double() || 3362 _class_name == vmSymbols::java_lang_Byte() || 3363 _class_name == vmSymbols::java_lang_Short() || 3364 _class_name == vmSymbols::java_lang_Integer() || 3365 _class_name == vmSymbols::java_lang_Long())) { 3366 allocation_style = 0; // Allocate oops first 3367 compact_fields = false; // Don't compact fields 3368 } 3369 3370 // Rearrange fields for a given allocation style 3371 if( allocation_style == 0 ) { 3372 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3373 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3374 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3375 (nonstatic_oop_count * heapOopSize); 3376 } else if( allocation_style == 1 ) { 3377 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3378 next_nonstatic_double_offset = next_nonstatic_field_offset; 3379 } else if( allocation_style == 2 ) { 3380 // Fields allocation: oops fields in super and sub classes are together. 3381 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3382 _super_klass->nonstatic_oop_map_size() > 0 ) { 3383 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3384 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3385 OopMapBlock* last_map = first_map + map_count - 1; 3386 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3387 if (next_offset == next_nonstatic_field_offset) { 3388 allocation_style = 0; // allocate oops first 3389 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3390 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3391 (nonstatic_oop_count * heapOopSize); 3392 } 3393 } 3394 if( allocation_style == 2 ) { 3395 allocation_style = 1; // allocate oops last 3396 next_nonstatic_double_offset = next_nonstatic_field_offset; 3397 } 3398 } else { 3399 ShouldNotReachHere(); 3400 } 3401 3402 int nonstatic_oop_space_count = 0; 3403 int nonstatic_word_space_count = 0; 3404 int nonstatic_short_space_count = 0; 3405 int nonstatic_byte_space_count = 0; 3406 int nonstatic_oop_space_offset = 0; 3407 int nonstatic_word_space_offset = 0; 3408 int nonstatic_short_space_offset = 0; 3409 int nonstatic_byte_space_offset = 0; 3410 3411 // Try to squeeze some of the fields into the gaps due to 3412 // long/double alignment. 3413 if( nonstatic_double_count > 0 ) { 3414 int offset = next_nonstatic_double_offset; 3415 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3416 if( compact_fields && offset != next_nonstatic_double_offset ) { 3417 // Allocate available fields into the gap before double field. 3418 int length = next_nonstatic_double_offset - offset; 3419 assert(length == BytesPerInt, ""); 3420 nonstatic_word_space_offset = offset; 3421 if( nonstatic_word_count > 0 ) { 3422 nonstatic_word_count -= 1; 3423 nonstatic_word_space_count = 1; // Only one will fit 3424 length -= BytesPerInt; 3425 offset += BytesPerInt; 3426 } 3427 nonstatic_short_space_offset = offset; 3428 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3429 nonstatic_short_count -= 1; 3430 nonstatic_short_space_count += 1; 3431 length -= BytesPerShort; 3432 offset += BytesPerShort; 3433 } 3434 nonstatic_byte_space_offset = offset; 3435 while( length > 0 && nonstatic_byte_count > 0 ) { 3436 nonstatic_byte_count -= 1; 3437 nonstatic_byte_space_count += 1; 3438 length -= 1; 3439 } 3440 // Allocate oop field in the gap if there are no other fields for that. 3441 nonstatic_oop_space_offset = offset; 3442 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3443 allocation_style != 0 ) { // when oop fields not first 3444 nonstatic_oop_count -= 1; 3445 nonstatic_oop_space_count = 1; // Only one will fit 3446 length -= heapOopSize; 3447 offset += heapOopSize; 3448 } 3449 } 3450 } 3451 3452 next_nonstatic_word_offset = next_nonstatic_double_offset + 3453 (nonstatic_double_count * BytesPerLong); 3454 next_nonstatic_short_offset = next_nonstatic_word_offset + 3455 (nonstatic_word_count * BytesPerInt); 3456 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3457 (nonstatic_short_count * BytesPerShort); 3458 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3459 nonstatic_byte_count; 3460 3461 // let oops jump before padding with this allocation style 3462 if( allocation_style == 1 ) { 3463 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3464 if( nonstatic_oop_count > 0 ) { 3465 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3466 } 3467 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3468 } 3469 3470 // Iterate over fields again and compute correct offsets. 3471 // The field allocation type was temporarily stored in the offset slot. 3472 // oop fields are located before non-oop fields (static and non-static). 3473 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3474 3475 // skip already laid out fields 3476 if (fs.is_offset_set()) continue; 3477 3478 // contended instance fields are handled below 3479 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3480 3481 int real_offset = 0; 3482 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3483 3484 // pack the rest of the fields 3485 switch (atype) { 3486 case STATIC_OOP: 3487 real_offset = next_static_oop_offset; 3488 next_static_oop_offset += heapOopSize; 3489 break; 3490 case STATIC_BYTE: 3491 real_offset = next_static_byte_offset; 3492 next_static_byte_offset += 1; 3493 break; 3494 case STATIC_SHORT: 3495 real_offset = next_static_short_offset; 3496 next_static_short_offset += BytesPerShort; 3497 break; 3498 case STATIC_WORD: 3499 real_offset = next_static_word_offset; 3500 next_static_word_offset += BytesPerInt; 3501 break; 3502 case STATIC_DOUBLE: 3503 real_offset = next_static_double_offset; 3504 next_static_double_offset += BytesPerLong; 3505 break; 3506 case NONSTATIC_OOP: 3507 if( nonstatic_oop_space_count > 0 ) { 3508 real_offset = nonstatic_oop_space_offset; 3509 nonstatic_oop_space_offset += heapOopSize; 3510 nonstatic_oop_space_count -= 1; 3511 } else { 3512 real_offset = next_nonstatic_oop_offset; 3513 next_nonstatic_oop_offset += heapOopSize; 3514 } 3515 3516 // Record this oop in the oop maps 3517 if( nonstatic_oop_map_count > 0 && 3518 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3519 real_offset - 3520 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3521 heapOopSize ) { 3522 // This oop is adjacent to the previous one, add to current oop map 3523 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3524 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3525 } else { 3526 // This oop is not adjacent to the previous one, create new oop map 3527 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3528 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3529 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3530 nonstatic_oop_map_count += 1; 3531 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3532 first_nonstatic_oop_offset = real_offset; 3533 } 3534 } 3535 break; 3536 case NONSTATIC_BYTE: 3537 if( nonstatic_byte_space_count > 0 ) { 3538 real_offset = nonstatic_byte_space_offset; 3539 nonstatic_byte_space_offset += 1; 3540 nonstatic_byte_space_count -= 1; 3541 } else { 3542 real_offset = next_nonstatic_byte_offset; 3543 next_nonstatic_byte_offset += 1; 3544 } 3545 break; 3546 case NONSTATIC_SHORT: 3547 if( nonstatic_short_space_count > 0 ) { 3548 real_offset = nonstatic_short_space_offset; 3549 nonstatic_short_space_offset += BytesPerShort; 3550 nonstatic_short_space_count -= 1; 3551 } else { 3552 real_offset = next_nonstatic_short_offset; 3553 next_nonstatic_short_offset += BytesPerShort; 3554 } 3555 break; 3556 case NONSTATIC_WORD: 3557 if( nonstatic_word_space_count > 0 ) { 3558 real_offset = nonstatic_word_space_offset; 3559 nonstatic_word_space_offset += BytesPerInt; 3560 nonstatic_word_space_count -= 1; 3561 } else { 3562 real_offset = next_nonstatic_word_offset; 3563 next_nonstatic_word_offset += BytesPerInt; 3564 } 3565 break; 3566 case NONSTATIC_DOUBLE: 3567 real_offset = next_nonstatic_double_offset; 3568 next_nonstatic_double_offset += BytesPerLong; 3569 break; 3570 default: 3571 ShouldNotReachHere(); 3572 } 3573 fs.set_offset(real_offset); 3574 } 3575 3576 3577 // Handle the contended cases. 3578 // 3579 // Each contended field should not intersect the cache line with another contended field. 3580 // In the absence of alignment information, we end up with pessimistically separating 3581 // the fields with full-width padding. 3582 // 3583 // Additionally, this should not break alignment for the fields, so we round the alignment up 3584 // for each field. 3585 if (nonstatic_contended_count > 0) { 3586 3587 // if there is at least one contended field, we need to have pre-padding for them 3588 next_nonstatic_padded_offset += ContendedPaddingWidth; 3589 3590 // collect all contended groups 3591 BitMap bm(_cp->size()); 3592 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3593 // skip already laid out fields 3594 if (fs.is_offset_set()) continue; 3595 3596 if (fs.is_contended()) { 3597 bm.set_bit(fs.contended_group()); 3598 } 3599 } 3600 3601 int current_group = -1; 3602 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3603 3604 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3605 3606 // skip already laid out fields 3607 if (fs.is_offset_set()) continue; 3608 3609 // skip non-contended fields and fields from different group 3610 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3611 3612 // handle statics below 3613 if (fs.access_flags().is_static()) continue; 3614 3615 int real_offset = 0; 3616 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3617 3618 switch (atype) { 3619 case NONSTATIC_BYTE: 3620 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3621 real_offset = next_nonstatic_padded_offset; 3622 next_nonstatic_padded_offset += 1; 3623 break; 3624 3625 case NONSTATIC_SHORT: 3626 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3627 real_offset = next_nonstatic_padded_offset; 3628 next_nonstatic_padded_offset += BytesPerShort; 3629 break; 3630 3631 case NONSTATIC_WORD: 3632 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3633 real_offset = next_nonstatic_padded_offset; 3634 next_nonstatic_padded_offset += BytesPerInt; 3635 break; 3636 3637 case NONSTATIC_DOUBLE: 3638 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3639 real_offset = next_nonstatic_padded_offset; 3640 next_nonstatic_padded_offset += BytesPerLong; 3641 break; 3642 3643 case NONSTATIC_OOP: 3644 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3645 real_offset = next_nonstatic_padded_offset; 3646 next_nonstatic_padded_offset += heapOopSize; 3647 3648 // Record this oop in the oop maps 3649 if( nonstatic_oop_map_count > 0 && 3650 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3651 real_offset - 3652 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3653 heapOopSize ) { 3654 // This oop is adjacent to the previous one, add to current oop map 3655 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3656 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3657 } else { 3658 // This oop is not adjacent to the previous one, create new oop map 3659 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3660 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3661 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3662 nonstatic_oop_map_count += 1; 3663 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3664 first_nonstatic_oop_offset = real_offset; 3665 } 3666 } 3667 break; 3668 3669 default: 3670 ShouldNotReachHere(); 3671 } 3672 3673 if (fs.contended_group() == 0) { 3674 // Contended group defines the equivalence class over the fields: 3675 // the fields within the same contended group are not inter-padded. 3676 // The only exception is default group, which does not incur the 3677 // equivalence, and so requires intra-padding. 3678 next_nonstatic_padded_offset += ContendedPaddingWidth; 3679 } 3680 3681 fs.set_offset(real_offset); 3682 } // for 3683 3684 // Start laying out the next group. 3685 // Note that this will effectively pad the last group in the back; 3686 // this is expected to alleviate memory contention effects for 3687 // subclass fields and/or adjacent object. 3688 // If this was the default group, the padding is already in place. 3689 if (current_group != 0) { 3690 next_nonstatic_padded_offset += ContendedPaddingWidth; 3691 } 3692 } 3693 3694 // handle static fields 3695 } 3696 3697 // Entire class is contended, pad in the back. 3698 // This helps to alleviate memory contention effects for subclass fields 3699 // and/or adjacent object. 3700 if (is_contended_class) { 3701 next_nonstatic_padded_offset += ContendedPaddingWidth; 3702 } 3703 3704 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3705 3706 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3707 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3708 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3709 3710 int static_field_size = (static_fields_end - 3711 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3712 nonstatic_field_size = nonstatic_field_size + 3713 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3714 3715 int instance_size = align_object_size(instance_end / wordSize); 3716 3717 assert(instance_size == align_object_size(align_size_up( 3718 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3719 wordSize) / wordSize), "consistent layout helper value"); 3720 3721 // Invariant: nonstatic_field end/start should only change if there are 3722 // nonstatic fields in the class, or if the class is contended. We compare 3723 // against the non-aligned value, so that end alignment will not fail the 3724 // assert without actually having the fields. 3725 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3726 is_contended_class || 3727 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3728 3729 // Number of non-static oop map blocks allocated at end of klass. 3730 const unsigned int total_oop_map_count = 3731 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3732 first_nonstatic_oop_offset); 3733 3734 #ifndef PRODUCT 3735 if (PrintFieldLayout) { 3736 print_field_layout(_class_name, 3737 _fields, 3738 _cp, 3739 instance_size, 3740 nonstatic_fields_start, 3741 nonstatic_fields_end, 3742 static_fields_end); 3743 } 3744 3745 #endif 3746 // Pass back information needed for InstanceKlass creation 3747 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3748 info->nonstatic_oop_counts = nonstatic_oop_counts; 3749 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3750 info->total_oop_map_count = total_oop_map_count; 3751 info->instance_size = instance_size; 3752 info->static_field_size = static_field_size; 3753 info->nonstatic_field_size = nonstatic_field_size; 3754 info->has_nonstatic_fields = has_nonstatic_fields; 3755 } 3756 3757 3758 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3759 ClassLoaderData* loader_data, 3760 Handle protection_domain, 3761 KlassHandle host_klass, 3762 GrowableArray<Handle>* cp_patches, 3763 TempNewSymbol& parsed_name, 3764 bool verify, 3765 TRAPS) { 3766 3767 // When a retransformable agent is attached, JVMTI caches the 3768 // class bytes that existed before the first retransformation. 3769 // If RedefineClasses() was used before the retransformable 3770 // agent attached, then the cached class bytes may not be the 3771 // original class bytes. 3772 JvmtiCachedClassFileData *cached_class_file = NULL; 3773 Handle class_loader(THREAD, loader_data->class_loader()); 3774 bool has_default_methods = false; 3775 bool declares_default_methods = false; 3776 ResourceMark rm(THREAD); 3777 3778 ClassFileStream* cfs = stream(); 3779 // Timing 3780 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3781 JavaThread* jt = (JavaThread*) THREAD; 3782 3783 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3784 ClassLoader::perf_class_parse_selftime(), 3785 NULL, 3786 jt->get_thread_stat()->perf_recursion_counts_addr(), 3787 jt->get_thread_stat()->perf_timers_addr(), 3788 PerfClassTraceTime::PARSE_CLASS); 3789 3790 init_parsed_class_attributes(loader_data); 3791 3792 if (JvmtiExport::should_post_class_file_load_hook()) { 3793 // Get the cached class file bytes (if any) from the class that 3794 // is being redefined or retransformed. We use jvmti_thread_state() 3795 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3796 // a JvmtiThreadState any earlier than necessary. This will help 3797 // avoid the bug described by 7126851. 3798 JvmtiThreadState *state = jt->jvmti_thread_state(); 3799 if (state != NULL) { 3800 KlassHandle *h_class_being_redefined = 3801 state->get_class_being_redefined(); 3802 if (h_class_being_redefined != NULL) { 3803 instanceKlassHandle ikh_class_being_redefined = 3804 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3805 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3806 } 3807 } 3808 3809 unsigned char* ptr = cfs->buffer(); 3810 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3811 3812 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3813 &ptr, &end_ptr, &cached_class_file); 3814 3815 if (ptr != cfs->buffer()) { 3816 // JVMTI agent has modified class file data. 3817 // Set new class file stream using JVMTI agent modified 3818 // class file data. 3819 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3820 set_stream(cfs); 3821 } 3822 } 3823 3824 _host_klass = host_klass; 3825 _cp_patches = cp_patches; 3826 3827 instanceKlassHandle nullHandle; 3828 3829 // Figure out whether we can skip format checking (matching classic VM behavior) 3830 if (DumpSharedSpaces) { 3831 // verify == true means it's a 'remote' class (i.e., non-boot class) 3832 // Verification decision is based on BytecodeVerificationRemote flag 3833 // for those classes. 3834 _need_verify = (verify) ? BytecodeVerificationRemote : 3835 BytecodeVerificationLocal; 3836 } else { 3837 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3838 } 3839 3840 // Set the verify flag in stream 3841 cfs->set_verify(_need_verify); 3842 3843 // Save the class file name for easier error message printing. 3844 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3845 3846 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3847 // Magic value 3848 u4 magic = cfs->get_u4_fast(); 3849 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3850 "Incompatible magic value %u in class file %s", 3851 magic, CHECK_(nullHandle)); 3852 3853 // Version numbers 3854 u2 minor_version = cfs->get_u2_fast(); 3855 u2 major_version = cfs->get_u2_fast(); 3856 3857 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { 3858 ResourceMark rm; 3859 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 3860 major_version, minor_version, name->as_C_string()); 3861 Exceptions::fthrow( 3862 THREAD_AND_LOCATION, 3863 vmSymbols::java_lang_UnsupportedClassVersionError(), 3864 "Unsupported major.minor version for dump time %u.%u", 3865 major_version, 3866 minor_version); 3867 } 3868 3869 // Check version numbers - we check this even with verifier off 3870 if (!is_supported_version(major_version, minor_version)) { 3871 if (name == NULL) { 3872 Exceptions::fthrow( 3873 THREAD_AND_LOCATION, 3874 vmSymbols::java_lang_UnsupportedClassVersionError(), 3875 "Unsupported class file version %u.%u, " 3876 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3877 major_version, 3878 minor_version, 3879 JAVA_MAX_SUPPORTED_VERSION, 3880 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3881 } else { 3882 ResourceMark rm(THREAD); 3883 Exceptions::fthrow( 3884 THREAD_AND_LOCATION, 3885 vmSymbols::java_lang_UnsupportedClassVersionError(), 3886 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 3887 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3888 name->as_C_string(), 3889 major_version, 3890 minor_version, 3891 JAVA_MAX_SUPPORTED_VERSION, 3892 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3893 } 3894 return nullHandle; 3895 } 3896 3897 _major_version = major_version; 3898 _minor_version = minor_version; 3899 3900 3901 // Check if verification needs to be relaxed for this class file 3902 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3903 _relax_verify = Verifier::relax_verify_for(class_loader()); 3904 3905 // Constant pool 3906 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3907 3908 int cp_size = cp->length(); 3909 3910 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3911 3912 // Access flags 3913 AccessFlags access_flags; 3914 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3915 3916 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3917 // Set abstract bit for old class files for backward compatibility 3918 flags |= JVM_ACC_ABSTRACT; 3919 } 3920 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3921 access_flags.set_flags(flags); 3922 3923 // This class and superclass 3924 u2 this_class_index = cfs->get_u2_fast(); 3925 check_property( 3926 valid_cp_range(this_class_index, cp_size) && 3927 cp->tag_at(this_class_index).is_unresolved_klass(), 3928 "Invalid this class index %u in constant pool in class file %s", 3929 this_class_index, CHECK_(nullHandle)); 3930 3931 Symbol* class_name = cp->klass_name_at(this_class_index); 3932 assert(class_name != NULL, "class_name can't be null"); 3933 3934 // It's important to set parsed_name *before* resolving the super class. 3935 // (it's used for cleanup by the caller if parsing fails) 3936 parsed_name = class_name; 3937 // parsed_name is returned and can be used if there's an error, so add to 3938 // its reference count. Caller will decrement the refcount. 3939 parsed_name->increment_refcount(); 3940 3941 // Update _class_name which could be null previously to be class_name 3942 _class_name = class_name; 3943 3944 // Don't need to check whether this class name is legal or not. 3945 // It has been checked when constant pool is parsed. 3946 // However, make sure it is not an array type. 3947 if (_need_verify) { 3948 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3949 "Bad class name in class file %s", 3950 CHECK_(nullHandle)); 3951 } 3952 3953 Klass* preserve_this_klass; // for storing result across HandleMark 3954 3955 // release all handles when parsing is done 3956 { HandleMark hm(THREAD); 3957 3958 // Checks if name in class file matches requested name 3959 if (name != NULL && class_name != name) { 3960 ResourceMark rm(THREAD); 3961 Exceptions::fthrow( 3962 THREAD_AND_LOCATION, 3963 vmSymbols::java_lang_NoClassDefFoundError(), 3964 "%s (wrong name: %s)", 3965 name->as_C_string(), 3966 class_name->as_C_string() 3967 ); 3968 return nullHandle; 3969 } 3970 3971 if (TraceClassLoadingPreorder) { 3972 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3973 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3974 tty->print_cr("]"); 3975 } 3976 #if INCLUDE_CDS 3977 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { 3978 // Only dump the classes that can be stored into CDS archive 3979 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { 3980 if (name != NULL) { 3981 ResourceMark rm(THREAD); 3982 classlist_file->print_cr("%s", name->as_C_string()); 3983 classlist_file->flush(); 3984 } 3985 } 3986 } 3987 #endif 3988 3989 u2 super_class_index = cfs->get_u2_fast(); 3990 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3991 CHECK_NULL); 3992 3993 // Interfaces 3994 u2 itfs_len = cfs->get_u2_fast(); 3995 Array<Klass*>* local_interfaces = 3996 parse_interfaces(itfs_len, protection_domain, _class_name, 3997 &has_default_methods, CHECK_(nullHandle)); 3998 3999 u2 java_fields_count = 0; 4000 // Fields (offsets are filled in later) 4001 FieldAllocationCount fac; 4002 Array<u2>* fields = parse_fields(class_name, 4003 access_flags.is_interface(), 4004 &fac, &java_fields_count, 4005 CHECK_(nullHandle)); 4006 // Methods 4007 bool has_final_method = false; 4008 AccessFlags promoted_flags; 4009 promoted_flags.set_flags(0); 4010 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 4011 &promoted_flags, 4012 &has_final_method, 4013 &declares_default_methods, 4014 CHECK_(nullHandle)); 4015 4016 if (declares_default_methods) { 4017 has_default_methods = true; 4018 } 4019 4020 // Additional attributes 4021 ClassAnnotationCollector parsed_annotations; 4022 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 4023 4024 // Finalize the Annotations metadata object, 4025 // now that all annotation arrays have been created. 4026 create_combined_annotations(CHECK_(nullHandle)); 4027 4028 // Make sure this is the end of class file stream 4029 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 4030 4031 // We check super class after class file is parsed and format is checked 4032 if (super_class_index > 0 && super_klass.is_null()) { 4033 Symbol* sk = cp->klass_name_at(super_class_index); 4034 if (access_flags.is_interface()) { 4035 // Before attempting to resolve the superclass, check for class format 4036 // errors not checked yet. 4037 guarantee_property(sk == vmSymbols::java_lang_Object(), 4038 "Interfaces must have java.lang.Object as superclass in class file %s", 4039 CHECK_(nullHandle)); 4040 } 4041 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 4042 class_loader, 4043 protection_domain, 4044 true, 4045 CHECK_(nullHandle)); 4046 4047 KlassHandle kh (THREAD, k); 4048 super_klass = instanceKlassHandle(THREAD, kh()); 4049 } 4050 if (super_klass.not_null()) { 4051 4052 if (super_klass->has_default_methods()) { 4053 has_default_methods = true; 4054 } 4055 4056 if (super_klass->is_interface()) { 4057 ResourceMark rm(THREAD); 4058 Exceptions::fthrow( 4059 THREAD_AND_LOCATION, 4060 vmSymbols::java_lang_IncompatibleClassChangeError(), 4061 "class %s has interface %s as super class", 4062 class_name->as_klass_external_name(), 4063 super_klass->external_name() 4064 ); 4065 return nullHandle; 4066 } 4067 // Make sure super class is not final 4068 if (super_klass->is_final()) { 4069 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 4070 } 4071 } 4072 4073 // save super klass for error handling. 4074 _super_klass = super_klass; 4075 4076 // Compute the transitive list of all unique interfaces implemented by this class 4077 _transitive_interfaces = 4078 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 4079 4080 // sort methods 4081 intArray* method_ordering = sort_methods(methods); 4082 4083 // promote flags from parse_methods() to the klass' flags 4084 access_flags.add_promoted_flags(promoted_flags.as_int()); 4085 4086 // Size of Java vtable (in words) 4087 int vtable_size = 0; 4088 int itable_size = 0; 4089 int num_miranda_methods = 0; 4090 4091 GrowableArray<Method*> all_mirandas(20); 4092 4093 klassVtable::compute_vtable_size_and_num_mirandas( 4094 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 4095 access_flags, class_loader, class_name, local_interfaces, 4096 CHECK_(nullHandle)); 4097 4098 // Size of Java itable (in words) 4099 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 4100 4101 FieldLayoutInfo info; 4102 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 4103 4104 int total_oop_map_size2 = 4105 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 4106 4107 // Compute reference type 4108 ReferenceType rt; 4109 if (super_klass() == NULL) { 4110 rt = REF_NONE; 4111 } else { 4112 rt = super_klass->reference_type(); 4113 } 4114 4115 // We can now create the basic Klass* for this klass 4116 _klass = InstanceKlass::allocate_instance_klass(loader_data, 4117 vtable_size, 4118 itable_size, 4119 info.static_field_size, 4120 total_oop_map_size2, 4121 rt, 4122 access_flags, 4123 name, 4124 super_klass(), 4125 !host_klass.is_null(), 4126 CHECK_(nullHandle)); 4127 instanceKlassHandle this_klass (THREAD, _klass); 4128 4129 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 4130 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 4131 "sanity"); 4132 4133 // Fill in information already parsed 4134 this_klass->set_should_verify_class(verify); 4135 jint lh = Klass::instance_layout_helper(info.instance_size, false); 4136 this_klass->set_layout_helper(lh); 4137 assert(this_klass->is_instance_klass(), "layout is correct"); 4138 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 4139 // Not yet: supers are done below to support the new subtype-checking fields 4140 //this_klass->set_super(super_klass()); 4141 this_klass->set_class_loader_data(loader_data); 4142 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 4143 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 4144 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 4145 4146 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 4147 4148 if (has_final_method) { 4149 this_klass->set_has_final_method(); 4150 } 4151 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 4152 // The InstanceKlass::_methods_jmethod_ids cache 4153 // is managed on the assumption that the initial cache 4154 // size is equal to the number of methods in the class. If 4155 // that changes, then InstanceKlass::idnum_can_increment() 4156 // has to be changed accordingly. 4157 this_klass->set_initial_method_idnum(methods->length()); 4158 this_klass->set_name(cp->klass_name_at(this_class_index)); 4159 if (is_anonymous()) // I am well known to myself 4160 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 4161 4162 this_klass->set_minor_version(minor_version); 4163 this_klass->set_major_version(major_version); 4164 this_klass->set_has_default_methods(has_default_methods); 4165 this_klass->set_declares_default_methods(declares_default_methods); 4166 4167 if (!host_klass.is_null()) { 4168 assert (this_klass->is_anonymous(), "should be the same"); 4169 this_klass->set_host_klass(host_klass()); 4170 } 4171 4172 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4173 // (We used to do this lazily, but now we query it in Rewriter, 4174 // which is eagerly done for every method, so we might as well do it now, 4175 // when everything is fresh in memory.) 4176 vmSymbols::SID klass_id = Method::klass_id_for_intrinsics(this_klass()); 4177 if (klass_id != vmSymbols::NO_SID) { 4178 for (int j = 0; j < methods->length(); j++) { 4179 Method* method = methods->at(j); 4180 method->init_intrinsic_id(); 4181 4182 if (CheckIntrinsics) { 4183 // Check if an intrinsic is defined for method 'method', 4184 // but the method is not annotated with @HotSpotIntrinsicCandidate. 4185 if (method->intrinsic_id() != vmIntrinsics::_none && 4186 !method->intrinsic_candidate()) { 4187 tty->print("Compiler intrinsic is defined for method [%s], " 4188 "but the method is not annotated with @HotSpotIntrinsicCandidate.%s", 4189 method->name_and_sig_as_C_string(), 4190 NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") 4191 ); 4192 tty->cr(); 4193 DEBUG_ONLY(vm_exit(1)); 4194 } 4195 // Check is the method 'method' is annotated with @HotSpotIntrinsicCandidate, 4196 // but there is no intrinsic available for it. 4197 if (method->intrinsic_candidate() && 4198 method->intrinsic_id() == vmIntrinsics::_none) { 4199 tty->print("Method [%s] is annotated with @HotSpotIntrinsicCandidate, " 4200 "but no compiler intrinsic is defined for the method.%s", 4201 method->name_and_sig_as_C_string(), 4202 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 4203 ); 4204 tty->cr(); 4205 DEBUG_ONLY(vm_exit(1)); 4206 } 4207 } 4208 } 4209 4210 #ifdef ASSERT 4211 if (CheckIntrinsics) { 4212 // Check for orphan methods in the current class. A method m 4213 // of a class C is orphan if an intrinsic is defined for method m, 4214 // but class C does not declare m. 4215 // The check is potentially expensive, therefore it is available 4216 // only in debug builds. 4217 4218 for (int id = vmIntrinsics::FIRST_ID; id < (int)vmIntrinsics::ID_LIMIT; id++) { 4219 if (id == vmIntrinsics::_compiledLambdaForm) { 4220 // The _compiledLamdbdaForm intrinsic is a special marker for bytecode 4221 // generated for the JVM from a LambdaForm and therefore no method 4222 // is defined for it. 4223 continue; 4224 } 4225 4226 if (vmIntrinsics::class_for(vmIntrinsics::ID_from(id)) == klass_id) { 4227 // Check if the current class contains a method with the same 4228 // name, flags, signature. 4229 bool match = false; 4230 for (int j = 0; j < methods->length(); j++) { 4231 Method* method = methods->at(j); 4232 if (id == method->intrinsic_id()) { 4233 match = true; 4234 break; 4235 } 4236 } 4237 4238 if (!match) { 4239 char buf[1000]; 4240 tty->print("Compiler intrinsic is defined for method [%s], " 4241 "but the method is not available in class [%s].%s", 4242 vmIntrinsics::short_name_as_C_string(vmIntrinsics::ID_from(id), buf, sizeof(buf)), 4243 this_klass->name()->as_C_string(), 4244 NOT_DEBUG("") DEBUG_ONLY(" Exiting.") 4245 ); 4246 tty->cr(); 4247 DEBUG_ONLY(vm_exit(1)); 4248 } 4249 } 4250 } 4251 } 4252 #endif // ASSERT 4253 } 4254 4255 4256 if (cached_class_file != NULL) { 4257 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4258 this_klass->set_cached_class_file(cached_class_file); 4259 } 4260 4261 // Fill in field values obtained by parse_classfile_attributes 4262 if (parsed_annotations.has_any_annotations()) 4263 parsed_annotations.apply_to(this_klass); 4264 apply_parsed_class_attributes(this_klass); 4265 4266 // Miranda methods 4267 if ((num_miranda_methods > 0) || 4268 // if this class introduced new miranda methods or 4269 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4270 // super class exists and this class inherited miranda methods 4271 ) { 4272 this_klass->set_has_miranda_methods(); // then set a flag 4273 } 4274 4275 // Fill in information needed to compute superclasses. 4276 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4277 4278 // Initialize itable offset tables 4279 klassItable::setup_itable_offset_table(this_klass); 4280 4281 // Compute transitive closure of interfaces this class implements 4282 // Do final class setup 4283 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4284 4285 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4286 set_precomputed_flags(this_klass); 4287 4288 // reinitialize modifiers, using the InnerClasses attribute 4289 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4290 this_klass->set_modifier_flags(computed_modifiers); 4291 4292 // check if this class can access its super class 4293 check_super_class_access(this_klass, CHECK_(nullHandle)); 4294 4295 // check if this class can access its superinterfaces 4296 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4297 4298 // check if this class overrides any final method 4299 check_final_method_override(this_klass, CHECK_(nullHandle)); 4300 4301 // check that if this class is an interface then it doesn't have static methods 4302 if (this_klass->is_interface()) { 4303 /* An interface in a JAVA 8 classfile can be static */ 4304 if (_major_version < JAVA_8_VERSION) { 4305 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4306 } 4307 } 4308 4309 // Allocate mirror and initialize static fields 4310 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, 4311 CHECK_(nullHandle)); 4312 4313 // Generate any default methods - default methods are interface methods 4314 // that have a default implementation. This is new with Lambda project. 4315 if (has_default_methods ) { 4316 DefaultMethods::generate_default_methods( 4317 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4318 } 4319 4320 // Update the loader_data graph. 4321 record_defined_class_dependencies(this_klass, CHECK_NULL); 4322 4323 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4324 false /* not shared class */); 4325 4326 if (TraceClassLoading) { 4327 ResourceMark rm; 4328 // print in a single call to reduce interleaving of output 4329 if (cfs->source() != NULL) { 4330 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4331 cfs->source()); 4332 } else if (class_loader.is_null()) { 4333 Klass* caller = 4334 THREAD->is_Java_thread() 4335 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 4336 : NULL; 4337 // caller can be NULL, for example, during a JVMTI VM_Init hook 4338 if (caller != NULL) { 4339 tty->print("[Loaded %s by instance of %s]\n", 4340 this_klass->external_name(), 4341 caller->external_name()); 4342 } else { 4343 tty->print("[Loaded %s]\n", this_klass->external_name()); 4344 } 4345 } else { 4346 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4347 class_loader->klass()->external_name()); 4348 } 4349 } 4350 4351 if (TraceClassResolution) { 4352 ResourceMark rm; 4353 // print out the superclass. 4354 const char * from = this_klass()->external_name(); 4355 if (this_klass->java_super() != NULL) { 4356 tty->print("RESOLVE %s %s (super)\n", from, this_klass->java_super()->external_name()); 4357 } 4358 // print out each of the interface classes referred to by this class. 4359 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4360 if (local_interfaces != NULL) { 4361 int length = local_interfaces->length(); 4362 for (int i = 0; i < length; i++) { 4363 Klass* k = local_interfaces->at(i); 4364 const char * to = k->external_name(); 4365 tty->print("RESOLVE %s %s (interface)\n", from, to); 4366 } 4367 } 4368 } 4369 4370 // preserve result across HandleMark 4371 preserve_this_klass = this_klass(); 4372 } 4373 4374 // Create new handle outside HandleMark (might be needed for 4375 // Extended Class Redefinition) 4376 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4377 debug_only(this_klass->verify();) 4378 4379 // Clear class if no error has occurred so destructor doesn't deallocate it 4380 _klass = NULL; 4381 return this_klass; 4382 } 4383 4384 // Destructor to clean up if there's an error 4385 ClassFileParser::~ClassFileParser() { 4386 MetadataFactory::free_metadata(_loader_data, _cp); 4387 MetadataFactory::free_array<u2>(_loader_data, _fields); 4388 4389 // Free methods 4390 InstanceKlass::deallocate_methods(_loader_data, _methods); 4391 4392 // beware of the Universe::empty_blah_array!! 4393 if (_inner_classes != Universe::the_empty_short_array()) { 4394 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4395 } 4396 4397 // Free interfaces 4398 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4399 _local_interfaces, _transitive_interfaces); 4400 4401 if (_combined_annotations != NULL) { 4402 // After all annotations arrays have been created, they are installed into the 4403 // Annotations object that will be assigned to the InstanceKlass being created. 4404 4405 // Deallocate the Annotations object and the installed annotations arrays. 4406 _combined_annotations->deallocate_contents(_loader_data); 4407 4408 // If the _combined_annotations pointer is non-NULL, 4409 // then the other annotations fields should have been cleared. 4410 assert(_annotations == NULL, "Should have been cleared"); 4411 assert(_type_annotations == NULL, "Should have been cleared"); 4412 assert(_fields_annotations == NULL, "Should have been cleared"); 4413 assert(_fields_type_annotations == NULL, "Should have been cleared"); 4414 } else { 4415 // If the annotations arrays were not installed into the Annotations object, 4416 // then they have to be deallocated explicitly. 4417 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4418 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4419 Annotations::free_contents(_loader_data, _fields_annotations); 4420 Annotations::free_contents(_loader_data, _fields_type_annotations); 4421 } 4422 4423 clear_class_metadata(); 4424 4425 // deallocate the klass if already created. Don't directly deallocate, but add 4426 // to the deallocate list so that the klass is removed from the CLD::_klasses list 4427 // at a safepoint. 4428 if (_klass != NULL) { 4429 _loader_data->add_to_deallocate_list(_klass); 4430 } 4431 _klass = NULL; 4432 } 4433 4434 void ClassFileParser::print_field_layout(Symbol* name, 4435 Array<u2>* fields, 4436 const constantPoolHandle& cp, 4437 int instance_size, 4438 int instance_fields_start, 4439 int instance_fields_end, 4440 int static_fields_end) { 4441 tty->print("%s: field layout\n", name->as_klass_external_name()); 4442 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4443 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4444 if (!fs.access_flags().is_static()) { 4445 tty->print(" @%3d \"%s\" %s\n", 4446 fs.offset(), 4447 fs.name()->as_klass_external_name(), 4448 fs.signature()->as_klass_external_name()); 4449 } 4450 } 4451 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4452 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4453 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4454 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4455 if (fs.access_flags().is_static()) { 4456 tty->print(" @%3d \"%s\" %s\n", 4457 fs.offset(), 4458 fs.name()->as_klass_external_name(), 4459 fs.signature()->as_klass_external_name()); 4460 } 4461 } 4462 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4463 tty->print("\n"); 4464 } 4465 4466 unsigned int 4467 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4468 unsigned int nonstatic_oop_map_count, 4469 int first_nonstatic_oop_offset) { 4470 unsigned int map_count = 4471 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4472 if (nonstatic_oop_map_count > 0) { 4473 // We have oops to add to map 4474 if (map_count == 0) { 4475 map_count = nonstatic_oop_map_count; 4476 } else { 4477 // Check whether we should add a new map block or whether the last one can 4478 // be extended 4479 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4480 OopMapBlock* const last_map = first_map + map_count - 1; 4481 4482 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4483 if (next_offset == first_nonstatic_oop_offset) { 4484 // There is no gap bettwen superklass's last oop field and first 4485 // local oop field, merge maps. 4486 nonstatic_oop_map_count -= 1; 4487 } else { 4488 // Superklass didn't end with a oop field, add extra maps 4489 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4490 } 4491 map_count += nonstatic_oop_map_count; 4492 } 4493 } 4494 return map_count; 4495 } 4496 4497 4498 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4499 unsigned int nonstatic_oop_map_count, 4500 int* nonstatic_oop_offsets, 4501 unsigned int* nonstatic_oop_counts) { 4502 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4503 const InstanceKlass* const super = k->superklass(); 4504 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4505 if (super_count > 0) { 4506 // Copy maps from superklass 4507 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4508 for (unsigned int i = 0; i < super_count; ++i) { 4509 *this_oop_map++ = *super_oop_map++; 4510 } 4511 } 4512 4513 if (nonstatic_oop_map_count > 0) { 4514 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4515 // The counts differ because there is no gap between superklass's last oop 4516 // field and the first local oop field. Extend the last oop map copied 4517 // from the superklass instead of creating new one. 4518 nonstatic_oop_map_count--; 4519 nonstatic_oop_offsets++; 4520 this_oop_map--; 4521 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4522 this_oop_map++; 4523 } 4524 4525 // Add new map blocks, fill them 4526 while (nonstatic_oop_map_count-- > 0) { 4527 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4528 this_oop_map->set_count(*nonstatic_oop_counts++); 4529 this_oop_map++; 4530 } 4531 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4532 this_oop_map, "sanity"); 4533 } 4534 } 4535 4536 4537 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4538 Klass* super = k->super(); 4539 4540 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4541 // in which case we don't have to register objects as finalizable 4542 if (!_has_empty_finalizer) { 4543 if (_has_finalizer || 4544 (super != NULL && super->has_finalizer())) { 4545 k->set_has_finalizer(); 4546 } 4547 } 4548 4549 #ifdef ASSERT 4550 bool f = false; 4551 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4552 vmSymbols::void_method_signature()); 4553 if (m != NULL && !m->is_empty_method()) { 4554 f = true; 4555 } 4556 4557 // Spec doesn't prevent agent from redefinition of empty finalizer. 4558 // Despite the fact that it's generally bad idea and redefined finalizer 4559 // will not work as expected we shouldn't abort vm in this case 4560 if (!k->has_redefined_this_or_super()) { 4561 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4562 } 4563 #endif 4564 4565 // Check if this klass supports the java.lang.Cloneable interface 4566 if (SystemDictionary::Cloneable_klass_loaded()) { 4567 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4568 k->set_is_cloneable(); 4569 } 4570 } 4571 4572 // Check if this klass has a vanilla default constructor 4573 if (super == NULL) { 4574 // java.lang.Object has empty default constructor 4575 k->set_has_vanilla_constructor(); 4576 } else { 4577 if (super->has_vanilla_constructor() && 4578 _has_vanilla_constructor) { 4579 k->set_has_vanilla_constructor(); 4580 } 4581 #ifdef ASSERT 4582 bool v = false; 4583 if (super->has_vanilla_constructor()) { 4584 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4585 ), vmSymbols::void_method_signature()); 4586 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4587 v = true; 4588 } 4589 } 4590 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4591 #endif 4592 } 4593 4594 // If it cannot be fast-path allocated, set a bit in the layout helper. 4595 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4596 assert(k->size_helper() > 0, "layout_helper is initialized"); 4597 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4598 || k->is_abstract() || k->is_interface() 4599 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4600 || k->size_helper() >= FastAllocateSizeLimit) { 4601 // Forbid fast-path allocation. 4602 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4603 k->set_layout_helper(lh); 4604 } 4605 } 4606 4607 // Attach super classes and interface classes to class loader data 4608 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4609 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4610 if (defining_loader_data->is_the_null_class_loader_data()) { 4611 // Dependencies to null class loader data are implicit. 4612 return; 4613 } else { 4614 // add super class dependency 4615 Klass* super = defined_klass->super(); 4616 if (super != NULL) { 4617 defining_loader_data->record_dependency(super, CHECK); 4618 } 4619 4620 // add super interface dependencies 4621 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4622 if (local_interfaces != NULL) { 4623 int length = local_interfaces->length(); 4624 for (int i = 0; i < length; i++) { 4625 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4626 } 4627 } 4628 } 4629 } 4630 4631 // utility methods for appending an array with check for duplicates 4632 4633 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4634 // iterate over new interfaces 4635 for (int i = 0; i < ifs->length(); i++) { 4636 Klass* e = ifs->at(i); 4637 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4638 // add new interface 4639 result->append_if_missing(e); 4640 } 4641 } 4642 4643 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4644 instanceKlassHandle super, 4645 Array<Klass*>* local_ifs, TRAPS) { 4646 // Compute maximum size for transitive interfaces 4647 int max_transitive_size = 0; 4648 int super_size = 0; 4649 // Add superclass transitive interfaces size 4650 if (super.not_null()) { 4651 super_size = super->transitive_interfaces()->length(); 4652 max_transitive_size += super_size; 4653 } 4654 // Add local interfaces' super interfaces 4655 int local_size = local_ifs->length(); 4656 for (int i = 0; i < local_size; i++) { 4657 Klass* l = local_ifs->at(i); 4658 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4659 } 4660 // Finally add local interfaces 4661 max_transitive_size += local_size; 4662 // Construct array 4663 if (max_transitive_size == 0) { 4664 // no interfaces, use canonicalized array 4665 return Universe::the_empty_klass_array(); 4666 } else if (max_transitive_size == super_size) { 4667 // no new local interfaces added, share superklass' transitive interface array 4668 return super->transitive_interfaces(); 4669 } else if (max_transitive_size == local_size) { 4670 // only local interfaces added, share local interface array 4671 return local_ifs; 4672 } else { 4673 ResourceMark rm; 4674 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4675 4676 // Copy down from superclass 4677 if (super.not_null()) { 4678 append_interfaces(result, super->transitive_interfaces()); 4679 } 4680 4681 // Copy down from local interfaces' superinterfaces 4682 for (int i = 0; i < local_ifs->length(); i++) { 4683 Klass* l = local_ifs->at(i); 4684 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4685 } 4686 // Finally add local interfaces 4687 append_interfaces(result, local_ifs); 4688 4689 // length will be less than the max_transitive_size if duplicates were removed 4690 int length = result->length(); 4691 assert(length <= max_transitive_size, "just checking"); 4692 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4693 for (int i = 0; i < length; i++) { 4694 Klass* e = result->at(i); 4695 assert(e != NULL, "just checking"); 4696 new_result->at_put(i, e); 4697 } 4698 return new_result; 4699 } 4700 } 4701 4702 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4703 Klass* super = this_klass->super(); 4704 if ((super != NULL) && 4705 (!Reflection::verify_class_access(this_klass(), super, false))) { 4706 ResourceMark rm(THREAD); 4707 Exceptions::fthrow( 4708 THREAD_AND_LOCATION, 4709 vmSymbols::java_lang_IllegalAccessError(), 4710 "class %s cannot access its superclass %s", 4711 this_klass->external_name(), 4712 super->external_name() 4713 ); 4714 return; 4715 } 4716 } 4717 4718 4719 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4720 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4721 int lng = local_interfaces->length(); 4722 for (int i = lng - 1; i >= 0; i--) { 4723 Klass* k = local_interfaces->at(i); 4724 assert (k != NULL && k->is_interface(), "invalid interface"); 4725 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4726 ResourceMark rm(THREAD); 4727 Exceptions::fthrow( 4728 THREAD_AND_LOCATION, 4729 vmSymbols::java_lang_IllegalAccessError(), 4730 "class %s cannot access its superinterface %s", 4731 this_klass->external_name(), 4732 k->external_name() 4733 ); 4734 return; 4735 } 4736 } 4737 } 4738 4739 4740 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4741 Array<Method*>* methods = this_klass->methods(); 4742 int num_methods = methods->length(); 4743 4744 // go thru each method and check if it overrides a final method 4745 for (int index = 0; index < num_methods; index++) { 4746 Method* m = methods->at(index); 4747 4748 // skip private, static, and <init> methods 4749 if ((!m->is_private() && !m->is_static()) && 4750 (m->name() != vmSymbols::object_initializer_name())) { 4751 4752 Symbol* name = m->name(); 4753 Symbol* signature = m->signature(); 4754 Klass* k = this_klass->super(); 4755 Method* super_m = NULL; 4756 while (k != NULL) { 4757 // skip supers that don't have final methods. 4758 if (k->has_final_method()) { 4759 // lookup a matching method in the super class hierarchy 4760 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4761 if (super_m == NULL) { 4762 break; // didn't find any match; get out 4763 } 4764 4765 if (super_m->is_final() && !super_m->is_static() && 4766 // matching method in super is final, and not static 4767 (Reflection::verify_field_access(this_klass(), 4768 super_m->method_holder(), 4769 super_m->method_holder(), 4770 super_m->access_flags(), false)) 4771 // this class can access super final method and therefore override 4772 ) { 4773 ResourceMark rm(THREAD); 4774 Exceptions::fthrow( 4775 THREAD_AND_LOCATION, 4776 vmSymbols::java_lang_VerifyError(), 4777 "class %s overrides final method %s.%s%s", 4778 this_klass->external_name(), 4779 super_m->method_holder()->external_name(), 4780 name->as_C_string(), 4781 signature->as_C_string() 4782 ); 4783 return; 4784 } 4785 4786 // continue to look from super_m's holder's super. 4787 k = super_m->method_holder()->super(); 4788 continue; 4789 } 4790 4791 k = k->super(); 4792 } 4793 } 4794 } 4795 } 4796 4797 4798 // assumes that this_klass is an interface 4799 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4800 assert(this_klass->is_interface(), "not an interface"); 4801 Array<Method*>* methods = this_klass->methods(); 4802 int num_methods = methods->length(); 4803 4804 for (int index = 0; index < num_methods; index++) { 4805 Method* m = methods->at(index); 4806 // if m is static and not the init method, throw a verify error 4807 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4808 ResourceMark rm(THREAD); 4809 Exceptions::fthrow( 4810 THREAD_AND_LOCATION, 4811 vmSymbols::java_lang_VerifyError(), 4812 "Illegal static method %s in interface %s", 4813 m->name()->as_C_string(), 4814 this_klass->external_name() 4815 ); 4816 return; 4817 } 4818 } 4819 } 4820 4821 // utility methods for format checking 4822 4823 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4824 if (!_need_verify) { return; } 4825 4826 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4827 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4828 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4829 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4830 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4831 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4832 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4833 4834 if ((is_abstract && is_final) || 4835 (is_interface && !is_abstract) || 4836 (is_interface && major_gte_15 && (is_super || is_enum)) || 4837 (!is_interface && major_gte_15 && is_annotation)) { 4838 ResourceMark rm(THREAD); 4839 Exceptions::fthrow( 4840 THREAD_AND_LOCATION, 4841 vmSymbols::java_lang_ClassFormatError(), 4842 "Illegal class modifiers in class %s: 0x%X", 4843 _class_name->as_C_string(), flags 4844 ); 4845 return; 4846 } 4847 } 4848 4849 bool ClassFileParser::has_illegal_visibility(jint flags) { 4850 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4851 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4852 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4853 4854 return ((is_public && is_protected) || 4855 (is_public && is_private) || 4856 (is_protected && is_private)); 4857 } 4858 4859 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4860 u2 max_version = JAVA_MAX_SUPPORTED_VERSION; 4861 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4862 (major <= max_version) && 4863 ((major != max_version) || 4864 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4865 } 4866 4867 void ClassFileParser::verify_legal_field_modifiers( 4868 jint flags, bool is_interface, TRAPS) { 4869 if (!_need_verify) { return; } 4870 4871 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4872 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4873 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4874 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4875 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4876 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4877 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4878 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4879 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4880 4881 bool is_illegal = false; 4882 4883 if (is_interface) { 4884 if (!is_public || !is_static || !is_final || is_private || 4885 is_protected || is_volatile || is_transient || 4886 (major_gte_15 && is_enum)) { 4887 is_illegal = true; 4888 } 4889 } else { // not interface 4890 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4891 is_illegal = true; 4892 } 4893 } 4894 4895 if (is_illegal) { 4896 ResourceMark rm(THREAD); 4897 Exceptions::fthrow( 4898 THREAD_AND_LOCATION, 4899 vmSymbols::java_lang_ClassFormatError(), 4900 "Illegal field modifiers in class %s: 0x%X", 4901 _class_name->as_C_string(), flags); 4902 return; 4903 } 4904 } 4905 4906 void ClassFileParser::verify_legal_method_modifiers( 4907 jint flags, bool is_interface, Symbol* name, TRAPS) { 4908 if (!_need_verify) { return; } 4909 4910 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4911 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4912 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4913 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4914 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4915 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4916 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4917 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4918 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4919 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4920 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4921 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4922 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4923 4924 bool is_illegal = false; 4925 4926 if (is_interface) { 4927 if (major_gte_8) { 4928 // Class file version is JAVA_8_VERSION or later Methods of 4929 // interfaces may set any of the flags except ACC_PROTECTED, 4930 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4931 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4932 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4933 (is_native || is_protected || is_final || is_synchronized) || 4934 // If a specific method of a class or interface has its 4935 // ACC_ABSTRACT flag set, it must not have any of its 4936 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4937 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4938 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4939 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4940 (is_abstract && (is_private || is_static || is_strict))) { 4941 is_illegal = true; 4942 } 4943 } else if (major_gte_15) { 4944 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4945 if (!is_public || is_static || is_final || is_synchronized || 4946 is_native || !is_abstract || is_strict) { 4947 is_illegal = true; 4948 } 4949 } else { 4950 // Class file version is pre-JAVA_1_5_VERSION 4951 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4952 is_illegal = true; 4953 } 4954 } 4955 } else { // not interface 4956 if (has_illegal_visibility(flags)) { 4957 is_illegal = true; 4958 } else { 4959 if (is_initializer) { 4960 if (is_static || is_final || is_synchronized || is_native || 4961 is_abstract || (major_gte_15 && is_bridge)) { 4962 is_illegal = true; 4963 } 4964 } else { // not initializer 4965 if (is_abstract) { 4966 if ((is_final || is_native || is_private || is_static || 4967 (major_gte_15 && (is_synchronized || is_strict)))) { 4968 is_illegal = true; 4969 } 4970 } 4971 } 4972 } 4973 } 4974 4975 if (is_illegal) { 4976 ResourceMark rm(THREAD); 4977 Exceptions::fthrow( 4978 THREAD_AND_LOCATION, 4979 vmSymbols::java_lang_ClassFormatError(), 4980 "Method %s in class %s has illegal modifiers: 0x%X", 4981 name->as_C_string(), _class_name->as_C_string(), flags); 4982 return; 4983 } 4984 } 4985 4986 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4987 assert(_need_verify, "only called when _need_verify is true"); 4988 int i = 0; 4989 int count = length >> 2; 4990 for (int k=0; k<count; k++) { 4991 unsigned char b0 = buffer[i]; 4992 unsigned char b1 = buffer[i+1]; 4993 unsigned char b2 = buffer[i+2]; 4994 unsigned char b3 = buffer[i+3]; 4995 // For an unsigned char v, 4996 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4997 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4998 unsigned char res = b0 | b0 - 1 | 4999 b1 | b1 - 1 | 5000 b2 | b2 - 1 | 5001 b3 | b3 - 1; 5002 if (res >= 128) break; 5003 i += 4; 5004 } 5005 for(; i < length; i++) { 5006 unsigned short c; 5007 // no embedded zeros 5008 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 5009 if(buffer[i] < 128) { 5010 continue; 5011 } 5012 if ((i + 5) < length) { // see if it's legal supplementary character 5013 if (UTF8::is_supplementary_character(&buffer[i])) { 5014 c = UTF8::get_supplementary_character(&buffer[i]); 5015 i += 5; 5016 continue; 5017 } 5018 } 5019 switch (buffer[i] >> 4) { 5020 default: break; 5021 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 5022 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5023 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 5024 c = (buffer[i] & 0x1F) << 6; 5025 i++; 5026 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 5027 c += buffer[i] & 0x3F; 5028 if (_major_version <= 47 || c == 0 || c >= 0x80) { 5029 // for classes with major > 47, c must a null or a character in its shortest form 5030 break; 5031 } 5032 } 5033 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5034 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 5035 c = (buffer[i] & 0xF) << 12; 5036 i += 2; 5037 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 5038 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 5039 if (_major_version <= 47 || c >= 0x800) { 5040 // for classes with major > 47, c must be in its shortest form 5041 break; 5042 } 5043 } 5044 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 5045 } // end of switch 5046 } // end of for 5047 } 5048 5049 // Checks if name is a legal class name. 5050 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 5051 if (!_need_verify || _relax_verify) { return; } 5052 5053 char buf[fixed_buffer_size]; 5054 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5055 unsigned int length = name->utf8_length(); 5056 bool legal = false; 5057 5058 if (length > 0) { 5059 char* p; 5060 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 5061 p = skip_over_field_signature(bytes, false, length, CHECK); 5062 legal = (p != NULL) && ((p - bytes) == (int)length); 5063 } else if (_major_version < JAVA_1_5_VERSION) { 5064 if (bytes[0] != '<') { 5065 p = skip_over_field_name(bytes, true, length); 5066 legal = (p != NULL) && ((p - bytes) == (int)length); 5067 } 5068 } else { 5069 // 4900761: relax the constraints based on JSR202 spec 5070 // Class names may be drawn from the entire Unicode character set. 5071 // Identifiers between '/' must be unqualified names. 5072 // The utf8 string has been verified when parsing cpool entries. 5073 legal = verify_unqualified_name(bytes, length, LegalClass); 5074 } 5075 } 5076 if (!legal) { 5077 ResourceMark rm(THREAD); 5078 Exceptions::fthrow( 5079 THREAD_AND_LOCATION, 5080 vmSymbols::java_lang_ClassFormatError(), 5081 "Illegal class name \"%s\" in class file %s", bytes, 5082 _class_name->as_C_string() 5083 ); 5084 return; 5085 } 5086 } 5087 5088 // Checks if name is a legal field name. 5089 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 5090 if (!_need_verify || _relax_verify) { return; } 5091 5092 char buf[fixed_buffer_size]; 5093 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5094 unsigned int length = name->utf8_length(); 5095 bool legal = false; 5096 5097 if (length > 0) { 5098 if (_major_version < JAVA_1_5_VERSION) { 5099 if (bytes[0] != '<') { 5100 char* p = skip_over_field_name(bytes, false, length); 5101 legal = (p != NULL) && ((p - bytes) == (int)length); 5102 } 5103 } else { 5104 // 4881221: relax the constraints based on JSR202 spec 5105 legal = verify_unqualified_name(bytes, length, LegalField); 5106 } 5107 } 5108 5109 if (!legal) { 5110 ResourceMark rm(THREAD); 5111 Exceptions::fthrow( 5112 THREAD_AND_LOCATION, 5113 vmSymbols::java_lang_ClassFormatError(), 5114 "Illegal field name \"%s\" in class %s", bytes, 5115 _class_name->as_C_string() 5116 ); 5117 return; 5118 } 5119 } 5120 5121 // Checks if name is a legal method name. 5122 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 5123 if (!_need_verify || _relax_verify) { return; } 5124 5125 assert(name != NULL, "method name is null"); 5126 char buf[fixed_buffer_size]; 5127 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5128 unsigned int length = name->utf8_length(); 5129 bool legal = false; 5130 5131 if (length > 0) { 5132 if (bytes[0] == '<') { 5133 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5134 legal = true; 5135 } 5136 } else if (_major_version < JAVA_1_5_VERSION) { 5137 char* p; 5138 p = skip_over_field_name(bytes, false, length); 5139 legal = (p != NULL) && ((p - bytes) == (int)length); 5140 } else { 5141 // 4881221: relax the constraints based on JSR202 spec 5142 legal = verify_unqualified_name(bytes, length, LegalMethod); 5143 } 5144 } 5145 5146 if (!legal) { 5147 ResourceMark rm(THREAD); 5148 Exceptions::fthrow( 5149 THREAD_AND_LOCATION, 5150 vmSymbols::java_lang_ClassFormatError(), 5151 "Illegal method name \"%s\" in class %s", bytes, 5152 _class_name->as_C_string() 5153 ); 5154 return; 5155 } 5156 } 5157 5158 5159 // Checks if signature is a legal field signature. 5160 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 5161 if (!_need_verify) { return; } 5162 5163 char buf[fixed_buffer_size]; 5164 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5165 unsigned int length = signature->utf8_length(); 5166 char* p = skip_over_field_signature(bytes, false, length, CHECK); 5167 5168 if (p == NULL || (p - bytes) != (int)length) { 5169 throwIllegalSignature("Field", name, signature, CHECK); 5170 } 5171 } 5172 5173 // Checks if signature is a legal method signature. 5174 // Returns number of parameters 5175 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 5176 if (!_need_verify) { 5177 // make sure caller's args_size will be less than 0 even for non-static 5178 // method so it will be recomputed in compute_size_of_parameters(). 5179 return -2; 5180 } 5181 5182 // Class initializers cannot have args for class format version >= 51. 5183 if (name == vmSymbols::class_initializer_name() && 5184 signature != vmSymbols::void_method_signature() && 5185 _major_version >= JAVA_7_VERSION) { 5186 throwIllegalSignature("Method", name, signature, CHECK_0); 5187 return 0; 5188 } 5189 5190 unsigned int args_size = 0; 5191 char buf[fixed_buffer_size]; 5192 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5193 unsigned int length = signature->utf8_length(); 5194 char* nextp; 5195 5196 // The first character must be a '(' 5197 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5198 length--; 5199 // Skip over legal field signatures 5200 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5201 while ((length > 0) && (nextp != NULL)) { 5202 args_size++; 5203 if (p[0] == 'J' || p[0] == 'D') { 5204 args_size++; 5205 } 5206 length -= nextp - p; 5207 p = nextp; 5208 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5209 } 5210 // The first non-signature thing better be a ')' 5211 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5212 length--; 5213 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5214 // All internal methods must return void 5215 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5216 return args_size; 5217 } 5218 } else { 5219 // Now we better just have a return value 5220 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5221 if (nextp && ((int)length == (nextp - p))) { 5222 return args_size; 5223 } 5224 } 5225 } 5226 } 5227 // Report error 5228 throwIllegalSignature("Method", name, signature, CHECK_0); 5229 return 0; 5230 } 5231 5232 5233 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5234 // Method names also may not contain the characters '<' or '>', unless <init> 5235 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5236 // method. Because these names have been checked as special cases before 5237 // calling this method in verify_legal_method_name. 5238 bool ClassFileParser::verify_unqualified_name( 5239 char* name, unsigned int length, int type) { 5240 jchar ch; 5241 5242 for (char* p = name; p != name + length; ) { 5243 ch = *p; 5244 if (ch < 128) { 5245 p++; 5246 if (ch == '.' || ch == ';' || ch == '[' ) { 5247 return false; // do not permit '.', ';', or '[' 5248 } 5249 if (type != LegalClass && ch == '/') { 5250 return false; // do not permit '/' unless it's class name 5251 } 5252 if (type == LegalMethod && (ch == '<' || ch == '>')) { 5253 return false; // do not permit '<' or '>' in method names 5254 } 5255 } else { 5256 char* tmp_p = UTF8::next(p, &ch); 5257 p = tmp_p; 5258 } 5259 } 5260 return true; 5261 } 5262 5263 5264 // Take pointer to a string. Skip over the longest part of the string that could 5265 // be taken as a fieldname. Allow '/' if slash_ok is true. 5266 // Return a pointer to just past the fieldname. 5267 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5268 // being true, we saw consecutive slashes (meaning we were looking for a 5269 // qualified path but found something that was badly-formed). 5270 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5271 char* p; 5272 jchar ch; 5273 jboolean last_is_slash = false; 5274 jboolean not_first_ch = false; 5275 5276 for (p = name; p != name + length; not_first_ch = true) { 5277 char* old_p = p; 5278 ch = *p; 5279 if (ch < 128) { 5280 p++; 5281 // quick check for ascii 5282 if ((ch >= 'a' && ch <= 'z') || 5283 (ch >= 'A' && ch <= 'Z') || 5284 (ch == '_' || ch == '$') || 5285 (not_first_ch && ch >= '0' && ch <= '9')) { 5286 last_is_slash = false; 5287 continue; 5288 } 5289 if (slash_ok && ch == '/') { 5290 if (last_is_slash) { 5291 return NULL; // Don't permit consecutive slashes 5292 } 5293 last_is_slash = true; 5294 continue; 5295 } 5296 } else { 5297 jint unicode_ch; 5298 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5299 p = tmp_p; 5300 last_is_slash = false; 5301 // Check if ch is Java identifier start or is Java identifier part 5302 // 4672820: call java.lang.Character methods directly without generating separate tables. 5303 EXCEPTION_MARK; 5304 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5305 5306 // return value 5307 JavaValue result(T_BOOLEAN); 5308 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5309 JavaCallArguments args; 5310 args.push_int(unicode_ch); 5311 5312 // public static boolean isJavaIdentifierStart(char ch); 5313 JavaCalls::call_static(&result, 5314 klass, 5315 vmSymbols::isJavaIdentifierStart_name(), 5316 vmSymbols::int_bool_signature(), 5317 &args, 5318 THREAD); 5319 5320 if (HAS_PENDING_EXCEPTION) { 5321 CLEAR_PENDING_EXCEPTION; 5322 return 0; 5323 } 5324 if (result.get_jboolean()) { 5325 continue; 5326 } 5327 5328 if (not_first_ch) { 5329 // public static boolean isJavaIdentifierPart(char ch); 5330 JavaCalls::call_static(&result, 5331 klass, 5332 vmSymbols::isJavaIdentifierPart_name(), 5333 vmSymbols::int_bool_signature(), 5334 &args, 5335 THREAD); 5336 5337 if (HAS_PENDING_EXCEPTION) { 5338 CLEAR_PENDING_EXCEPTION; 5339 return 0; 5340 } 5341 5342 if (result.get_jboolean()) { 5343 continue; 5344 } 5345 } 5346 } 5347 return (not_first_ch) ? old_p : NULL; 5348 } 5349 return (not_first_ch) ? p : NULL; 5350 } 5351 5352 5353 // Take pointer to a string. Skip over the longest part of the string that could 5354 // be taken as a field signature. Allow "void" if void_ok. 5355 // Return a pointer to just past the signature. 5356 // Return NULL if no legal signature is found. 5357 char* ClassFileParser::skip_over_field_signature(char* signature, 5358 bool void_ok, 5359 unsigned int length, 5360 TRAPS) { 5361 unsigned int array_dim = 0; 5362 while (length > 0) { 5363 switch (signature[0]) { 5364 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5365 case JVM_SIGNATURE_BOOLEAN: 5366 case JVM_SIGNATURE_BYTE: 5367 case JVM_SIGNATURE_CHAR: 5368 case JVM_SIGNATURE_SHORT: 5369 case JVM_SIGNATURE_INT: 5370 case JVM_SIGNATURE_FLOAT: 5371 case JVM_SIGNATURE_LONG: 5372 case JVM_SIGNATURE_DOUBLE: 5373 return signature + 1; 5374 case JVM_SIGNATURE_CLASS: { 5375 if (_major_version < JAVA_1_5_VERSION) { 5376 // Skip over the class name if one is there 5377 char* p = skip_over_field_name(signature + 1, true, --length); 5378 5379 // The next character better be a semicolon 5380 if (p && (p - signature) > 1 && p[0] == ';') { 5381 return p + 1; 5382 } 5383 } else { 5384 // 4900761: For class version > 48, any unicode is allowed in class name. 5385 length--; 5386 signature++; 5387 while (length > 0 && signature[0] != ';') { 5388 if (signature[0] == '.') { 5389 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5390 } 5391 length--; 5392 signature++; 5393 } 5394 if (signature[0] == ';') { return signature + 1; } 5395 } 5396 5397 return NULL; 5398 } 5399 case JVM_SIGNATURE_ARRAY: 5400 array_dim++; 5401 if (array_dim > 255) { 5402 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5403 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5404 } 5405 // The rest of what's there better be a legal signature 5406 signature++; 5407 length--; 5408 void_ok = false; 5409 break; 5410 5411 default: 5412 return NULL; 5413 } 5414 } 5415 return NULL; 5416 }