1 /* 2 * Copyright (c) 1997, 2014, 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.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/defaultMethods.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #if INCLUDE_CDS 35 #include "classfile/systemDictionaryShared.hpp" 36 #endif 37 #include "classfile/verificationType.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "memory/allocation.hpp" 41 #include "memory/gcLocker.hpp" 42 #include "memory/metadataFactory.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/referenceType.hpp" 45 #include "memory/universe.inline.hpp" 46 #include "oops/constantPool.hpp" 47 #include "oops/fieldStreams.hpp" 48 #include "oops/instanceKlass.hpp" 49 #include "oops/instanceMirrorKlass.hpp" 50 #include "oops/klass.inline.hpp" 51 #include "oops/klassVtable.hpp" 52 #include "oops/method.hpp" 53 #include "oops/symbol.hpp" 54 #include "prims/jvm.h" 55 #include "prims/jvmtiExport.hpp" 56 #include "prims/jvmtiThreadState.hpp" 57 #include "runtime/javaCalls.hpp" 58 #include "runtime/perfData.hpp" 59 #include "runtime/reflection.hpp" 60 #include "runtime/signature.hpp" 61 #include "runtime/timer.hpp" 62 #include "services/classLoadingService.hpp" 63 #include "services/threadService.hpp" 64 #include "utilities/array.hpp" 65 #include "utilities/globalDefinitions.hpp" 66 #include "utilities/ostream.hpp" 67 68 // We generally try to create the oops directly when parsing, rather than 69 // allocating temporary data structures and copying the bytes twice. A 70 // temporary area is only needed when parsing utf8 entries in the constant 71 // pool and when parsing line number tables. 72 73 // We add assert in debug mode when class format is not checked. 74 75 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 76 #define JAVA_MIN_SUPPORTED_VERSION 45 77 #define JAVA_MAX_SUPPORTED_VERSION 52 78 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 79 80 // Used for two backward compatibility reasons: 81 // - to check for new additions to the class file format in JDK1.5 82 // - to check for bug fixes in the format checker in JDK1.5 83 #define JAVA_1_5_VERSION 49 84 85 // Used for backward compatibility reasons: 86 // - to check for javac bug fixes that happened after 1.5 87 // - also used as the max version when running in jdk6 88 #define JAVA_6_VERSION 50 89 90 // Used for backward compatibility reasons: 91 // - to check NameAndType_info signatures more aggressively 92 #define JAVA_7_VERSION 51 93 94 // Extension method support. 95 #define JAVA_8_VERSION 52 96 97 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 98 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 99 // this function (_current can be allocated in a register, with scalar 100 // replacement of aggregates). The _current pointer is copied back to 101 // stream() when this function returns. DON'T call another method within 102 // this method that uses stream(). 103 ClassFileStream* cfs0 = stream(); 104 ClassFileStream cfs1 = *cfs0; 105 ClassFileStream* cfs = &cfs1; 106 #ifdef ASSERT 107 assert(cfs->allocated_on_stack(),"should be local"); 108 u1* old_current = cfs0->current(); 109 #endif 110 Handle class_loader(THREAD, _loader_data->class_loader()); 111 112 // Used for batching symbol allocations. 113 const char* names[SymbolTable::symbol_alloc_batch_size]; 114 int lengths[SymbolTable::symbol_alloc_batch_size]; 115 int indices[SymbolTable::symbol_alloc_batch_size]; 116 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 117 int names_count = 0; 118 119 // parsing Index 0 is unused 120 for (int index = 1; index < length; index++) { 121 // Each of the following case guarantees one more byte in the stream 122 // for the following tag or the access_flags following constant pool, 123 // so we don't need bounds-check for reading tag. 124 u1 tag = cfs->get_u1_fast(); 125 switch (tag) { 126 case JVM_CONSTANT_Class : 127 { 128 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 129 u2 name_index = cfs->get_u2_fast(); 130 _cp->klass_index_at_put(index, name_index); 131 } 132 break; 133 case JVM_CONSTANT_Fieldref : 134 { 135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 136 u2 class_index = cfs->get_u2_fast(); 137 u2 name_and_type_index = cfs->get_u2_fast(); 138 _cp->field_at_put(index, class_index, name_and_type_index); 139 } 140 break; 141 case JVM_CONSTANT_Methodref : 142 { 143 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 144 u2 class_index = cfs->get_u2_fast(); 145 u2 name_and_type_index = cfs->get_u2_fast(); 146 _cp->method_at_put(index, class_index, name_and_type_index); 147 } 148 break; 149 case JVM_CONSTANT_InterfaceMethodref : 150 { 151 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 152 u2 class_index = cfs->get_u2_fast(); 153 u2 name_and_type_index = cfs->get_u2_fast(); 154 _cp->interface_method_at_put(index, class_index, name_and_type_index); 155 } 156 break; 157 case JVM_CONSTANT_String : 158 { 159 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 160 u2 string_index = cfs->get_u2_fast(); 161 _cp->string_index_at_put(index, string_index); 162 } 163 break; 164 case JVM_CONSTANT_MethodHandle : 165 case JVM_CONSTANT_MethodType : 166 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 167 classfile_parse_error( 168 "Class file version does not support constant tag %u in class file %s", 169 tag, CHECK); 170 } 171 if (!EnableInvokeDynamic) { 172 classfile_parse_error( 173 "This JVM does not support constant tag %u in class file %s", 174 tag, CHECK); 175 } 176 if (tag == JVM_CONSTANT_MethodHandle) { 177 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 178 u1 ref_kind = cfs->get_u1_fast(); 179 u2 method_index = cfs->get_u2_fast(); 180 _cp->method_handle_index_at_put(index, ref_kind, method_index); 181 } else if (tag == JVM_CONSTANT_MethodType) { 182 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 183 u2 signature_index = cfs->get_u2_fast(); 184 _cp->method_type_index_at_put(index, signature_index); 185 } else { 186 ShouldNotReachHere(); 187 } 188 break; 189 case JVM_CONSTANT_InvokeDynamic : 190 { 191 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 192 classfile_parse_error( 193 "Class file version does not support constant tag %u in class file %s", 194 tag, CHECK); 195 } 196 if (!EnableInvokeDynamic) { 197 classfile_parse_error( 198 "This JVM does not support constant tag %u in class file %s", 199 tag, CHECK); 200 } 201 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 202 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 203 u2 name_and_type_index = cfs->get_u2_fast(); 204 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 205 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 206 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 207 } 208 break; 209 case JVM_CONSTANT_Integer : 210 { 211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 212 u4 bytes = cfs->get_u4_fast(); 213 _cp->int_at_put(index, (jint) bytes); 214 } 215 break; 216 case JVM_CONSTANT_Float : 217 { 218 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 219 u4 bytes = cfs->get_u4_fast(); 220 _cp->float_at_put(index, *(jfloat*)&bytes); 221 } 222 break; 223 case JVM_CONSTANT_Long : 224 // A mangled type might cause you to overrun allocated memory 225 guarantee_property(index+1 < length, 226 "Invalid constant pool entry %u in class file %s", 227 index, CHECK); 228 { 229 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 230 u8 bytes = cfs->get_u8_fast(); 231 _cp->long_at_put(index, bytes); 232 } 233 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 234 break; 235 case JVM_CONSTANT_Double : 236 // A mangled type might cause you to overrun allocated memory 237 guarantee_property(index+1 < length, 238 "Invalid constant pool entry %u in class file %s", 239 index, CHECK); 240 { 241 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 242 u8 bytes = cfs->get_u8_fast(); 243 _cp->double_at_put(index, *(jdouble*)&bytes); 244 } 245 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 246 break; 247 case JVM_CONSTANT_NameAndType : 248 { 249 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 250 u2 name_index = cfs->get_u2_fast(); 251 u2 signature_index = cfs->get_u2_fast(); 252 _cp->name_and_type_at_put(index, name_index, signature_index); 253 } 254 break; 255 case JVM_CONSTANT_Utf8 : 256 { 257 cfs->guarantee_more(2, CHECK); // utf8_length 258 u2 utf8_length = cfs->get_u2_fast(); 259 u1* utf8_buffer = cfs->get_u1_buffer(); 260 assert(utf8_buffer != NULL, "null utf8 buffer"); 261 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 262 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 263 cfs->skip_u1_fast(utf8_length); 264 265 // Before storing the symbol, make sure it's legal 266 if (_need_verify) { 267 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 268 } 269 270 if (EnableInvokeDynamic && has_cp_patch_at(index)) { 271 Handle patch = clear_cp_patch_at(index); 272 guarantee_property(java_lang_String::is_instance(patch()), 273 "Illegal utf8 patch at %d in class file %s", 274 index, CHECK); 275 char* str = java_lang_String::as_utf8_string(patch()); 276 // (could use java_lang_String::as_symbol instead, but might as well batch them) 277 utf8_buffer = (u1*) str; 278 utf8_length = (int) strlen(str); 279 } 280 281 unsigned int hash; 282 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 283 if (result == NULL) { 284 names[names_count] = (char*)utf8_buffer; 285 lengths[names_count] = utf8_length; 286 indices[names_count] = index; 287 hashValues[names_count++] = hash; 288 if (names_count == SymbolTable::symbol_alloc_batch_size) { 289 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 290 names_count = 0; 291 } 292 } else { 293 _cp->symbol_at_put(index, result); 294 } 295 } 296 break; 297 default: 298 classfile_parse_error( 299 "Unknown constant tag %u in class file %s", tag, CHECK); 300 break; 301 } 302 } 303 304 // Allocate the remaining symbols 305 if (names_count > 0) { 306 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 307 } 308 309 // Copy _current pointer of local copy back to stream(). 310 #ifdef ASSERT 311 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 312 #endif 313 cfs0->set_current(cfs1.current()); 314 } 315 316 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 317 318 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 319 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 320 return cp->symbol_at(index); 321 else 322 return NULL; 323 } 324 325 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 326 ClassFileStream* cfs = stream(); 327 constantPoolHandle nullHandle; 328 329 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 330 u2 length = cfs->get_u2_fast(); 331 guarantee_property( 332 length >= 1, "Illegal constant pool size %u in class file %s", 333 length, CHECK_(nullHandle)); 334 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 335 CHECK_(nullHandle)); 336 _cp = constant_pool; // save in case of errors 337 constantPoolHandle cp (THREAD, constant_pool); 338 339 // parsing constant pool entries 340 parse_constant_pool_entries(length, CHECK_(nullHandle)); 341 342 int index = 1; // declared outside of loops for portability 343 344 // first verification pass - validate cross references and fixup class and string constants 345 for (index = 1; index < length; index++) { // Index 0 is unused 346 jbyte tag = cp->tag_at(index).value(); 347 switch (tag) { 348 case JVM_CONSTANT_Class : 349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 350 break; 351 case JVM_CONSTANT_Fieldref : 352 // fall through 353 case JVM_CONSTANT_Methodref : 354 // fall through 355 case JVM_CONSTANT_InterfaceMethodref : { 356 if (!_need_verify) break; 357 int klass_ref_index = cp->klass_ref_index_at(index); 358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 359 check_property(valid_klass_reference_at(klass_ref_index), 360 "Invalid constant pool index %u in class file %s", 361 klass_ref_index, 362 CHECK_(nullHandle)); 363 check_property(valid_cp_range(name_and_type_ref_index, length) && 364 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 365 "Invalid constant pool index %u in class file %s", 366 name_and_type_ref_index, 367 CHECK_(nullHandle)); 368 break; 369 } 370 case JVM_CONSTANT_String : 371 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 372 break; 373 case JVM_CONSTANT_Integer : 374 break; 375 case JVM_CONSTANT_Float : 376 break; 377 case JVM_CONSTANT_Long : 378 case JVM_CONSTANT_Double : 379 index++; 380 check_property( 381 (index < length && cp->tag_at(index).is_invalid()), 382 "Improper constant pool long/double index %u in class file %s", 383 index, CHECK_(nullHandle)); 384 break; 385 case JVM_CONSTANT_NameAndType : { 386 if (!_need_verify) break; 387 int name_ref_index = cp->name_ref_index_at(index); 388 int signature_ref_index = cp->signature_ref_index_at(index); 389 check_property(valid_symbol_at(name_ref_index), 390 "Invalid constant pool index %u in class file %s", 391 name_ref_index, CHECK_(nullHandle)); 392 check_property(valid_symbol_at(signature_ref_index), 393 "Invalid constant pool index %u in class file %s", 394 signature_ref_index, CHECK_(nullHandle)); 395 break; 396 } 397 case JVM_CONSTANT_Utf8 : 398 break; 399 case JVM_CONSTANT_UnresolvedClass : // fall-through 400 case JVM_CONSTANT_UnresolvedClassInError: 401 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 402 break; 403 case JVM_CONSTANT_ClassIndex : 404 { 405 int class_index = cp->klass_index_at(index); 406 check_property(valid_symbol_at(class_index), 407 "Invalid constant pool index %u in class file %s", 408 class_index, CHECK_(nullHandle)); 409 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 410 } 411 break; 412 case JVM_CONSTANT_StringIndex : 413 { 414 int string_index = cp->string_index_at(index); 415 check_property(valid_symbol_at(string_index), 416 "Invalid constant pool index %u in class file %s", 417 string_index, CHECK_(nullHandle)); 418 Symbol* sym = cp->symbol_at(string_index); 419 cp->unresolved_string_at_put(index, sym); 420 } 421 break; 422 case JVM_CONSTANT_MethodHandle : 423 { 424 int ref_index = cp->method_handle_index_at(index); 425 check_property( 426 valid_cp_range(ref_index, length) && 427 EnableInvokeDynamic, 428 "Invalid constant pool index %u in class file %s", 429 ref_index, CHECK_(nullHandle)); 430 constantTag tag = cp->tag_at(ref_index); 431 int ref_kind = cp->method_handle_ref_kind_at(index); 432 switch (ref_kind) { 433 case JVM_REF_getField: 434 case JVM_REF_getStatic: 435 case JVM_REF_putField: 436 case JVM_REF_putStatic: 437 check_property( 438 tag.is_field(), 439 "Invalid constant pool index %u in class file %s (not a field)", 440 ref_index, CHECK_(nullHandle)); 441 break; 442 case JVM_REF_invokeVirtual: 443 case JVM_REF_newInvokeSpecial: 444 check_property( 445 tag.is_method(), 446 "Invalid constant pool index %u in class file %s (not a method)", 447 ref_index, CHECK_(nullHandle)); 448 break; 449 case JVM_REF_invokeStatic: 450 case JVM_REF_invokeSpecial: 451 check_property(tag.is_method() || 452 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 453 "Invalid constant pool index %u in class file %s (not a method)", 454 ref_index, CHECK_(nullHandle)); 455 break; 456 case JVM_REF_invokeInterface: 457 check_property( 458 tag.is_interface_method(), 459 "Invalid constant pool index %u in class file %s (not an interface method)", 460 ref_index, CHECK_(nullHandle)); 461 break; 462 default: 463 classfile_parse_error( 464 "Bad method handle kind at constant pool index %u in class file %s", 465 index, CHECK_(nullHandle)); 466 } 467 // Keep the ref_index unchanged. It will be indirected at link-time. 468 } 469 break; 470 case JVM_CONSTANT_MethodType : 471 { 472 int ref_index = cp->method_type_index_at(index); 473 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic, 474 "Invalid constant pool index %u in class file %s", 475 ref_index, CHECK_(nullHandle)); 476 } 477 break; 478 case JVM_CONSTANT_InvokeDynamic : 479 { 480 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 481 check_property(valid_cp_range(name_and_type_ref_index, length) && 482 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 483 "Invalid constant pool index %u in class file %s", 484 name_and_type_ref_index, 485 CHECK_(nullHandle)); 486 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 487 break; 488 } 489 default: 490 fatal(err_msg("bad constant pool tag value %u", 491 cp->tag_at(index).value())); 492 ShouldNotReachHere(); 493 break; 494 } // end of switch 495 } // end of for 496 497 if (_cp_patches != NULL) { 498 // need to treat this_class specially... 499 assert(EnableInvokeDynamic, ""); 500 int this_class_index; 501 { 502 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 503 u1* mark = cfs->current(); 504 u2 flags = cfs->get_u2_fast(); 505 this_class_index = cfs->get_u2_fast(); 506 cfs->set_current(mark); // revert to mark 507 } 508 509 for (index = 1; index < length; index++) { // Index 0 is unused 510 if (has_cp_patch_at(index)) { 511 guarantee_property(index != this_class_index, 512 "Illegal constant pool patch to self at %d in class file %s", 513 index, CHECK_(nullHandle)); 514 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 515 } 516 } 517 } 518 519 if (!_need_verify) { 520 return cp; 521 } 522 523 // second verification pass - checks the strings are of the right format. 524 // but not yet to the other entries 525 for (index = 1; index < length; index++) { 526 jbyte tag = cp->tag_at(index).value(); 527 switch (tag) { 528 case JVM_CONSTANT_UnresolvedClass: { 529 Symbol* class_name = cp->unresolved_klass_at(index); 530 // check the name, even if _cp_patches will overwrite it 531 verify_legal_class_name(class_name, CHECK_(nullHandle)); 532 break; 533 } 534 case JVM_CONSTANT_NameAndType: { 535 if (_need_verify && _major_version >= JAVA_7_VERSION) { 536 int sig_index = cp->signature_ref_index_at(index); 537 int name_index = cp->name_ref_index_at(index); 538 Symbol* name = cp->symbol_at(name_index); 539 Symbol* sig = cp->symbol_at(sig_index); 540 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 541 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 542 } else { 543 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 544 } 545 } 546 break; 547 } 548 case JVM_CONSTANT_InvokeDynamic: 549 case JVM_CONSTANT_Fieldref: 550 case JVM_CONSTANT_Methodref: 551 case JVM_CONSTANT_InterfaceMethodref: { 552 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 553 // already verified to be utf8 554 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 555 // already verified to be utf8 556 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 557 Symbol* name = cp->symbol_at(name_ref_index); 558 Symbol* signature = cp->symbol_at(signature_ref_index); 559 if (tag == JVM_CONSTANT_Fieldref) { 560 verify_legal_field_name(name, CHECK_(nullHandle)); 561 if (_need_verify && _major_version >= JAVA_7_VERSION) { 562 // Signature is verified above, when iterating NameAndType_info. 563 // Need only to be sure it's the right type. 564 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 565 throwIllegalSignature( 566 "Field", name, signature, CHECK_(nullHandle)); 567 } 568 } else { 569 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 570 } 571 } else { 572 verify_legal_method_name(name, CHECK_(nullHandle)); 573 if (_need_verify && _major_version >= JAVA_7_VERSION) { 574 // Signature is verified above, when iterating NameAndType_info. 575 // Need only to be sure it's the right type. 576 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 577 throwIllegalSignature( 578 "Method", name, signature, CHECK_(nullHandle)); 579 } 580 } else { 581 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 582 } 583 if (tag == JVM_CONSTANT_Methodref) { 584 // 4509014: If a class method name begins with '<', it must be "<init>". 585 assert(name != NULL, "method name in constant pool is null"); 586 unsigned int name_len = name->utf8_length(); 587 assert(name_len > 0, "bad method name"); // already verified as legal name 588 if (name->byte_at(0) == '<') { 589 if (name != vmSymbols::object_initializer_name()) { 590 classfile_parse_error( 591 "Bad method name at constant pool index %u in class file %s", 592 name_ref_index, CHECK_(nullHandle)); 593 } 594 } 595 } 596 } 597 break; 598 } 599 case JVM_CONSTANT_MethodHandle: { 600 int ref_index = cp->method_handle_index_at(index); 601 int ref_kind = cp->method_handle_ref_kind_at(index); 602 switch (ref_kind) { 603 case JVM_REF_invokeVirtual: 604 case JVM_REF_invokeStatic: 605 case JVM_REF_invokeSpecial: 606 case JVM_REF_newInvokeSpecial: 607 { 608 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 609 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 610 Symbol* name = cp->symbol_at(name_ref_index); 611 if (ref_kind == JVM_REF_newInvokeSpecial) { 612 if (name != vmSymbols::object_initializer_name()) { 613 classfile_parse_error( 614 "Bad constructor name at constant pool index %u in class file %s", 615 name_ref_index, CHECK_(nullHandle)); 616 } 617 } else { 618 if (name == vmSymbols::object_initializer_name()) { 619 classfile_parse_error( 620 "Bad method name at constant pool index %u in class file %s", 621 name_ref_index, CHECK_(nullHandle)); 622 } 623 } 624 } 625 break; 626 // Other ref_kinds are already fully checked in previous pass. 627 } 628 break; 629 } 630 case JVM_CONSTANT_MethodType: { 631 Symbol* no_name = vmSymbols::type_name(); // place holder 632 Symbol* signature = cp->method_type_signature_at(index); 633 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 634 break; 635 } 636 case JVM_CONSTANT_Utf8: { 637 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 638 } 639 } // end of switch 640 } // end of for 641 642 return cp; 643 } 644 645 646 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 647 assert(EnableInvokeDynamic, ""); 648 BasicType patch_type = T_VOID; 649 650 switch (cp->tag_at(index).value()) { 651 652 case JVM_CONSTANT_UnresolvedClass : 653 // Patching a class means pre-resolving it. 654 // The name in the constant pool is ignored. 655 if (java_lang_Class::is_instance(patch())) { 656 guarantee_property(!java_lang_Class::is_primitive(patch()), 657 "Illegal class patch at %d in class file %s", 658 index, CHECK); 659 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 660 } else { 661 guarantee_property(java_lang_String::is_instance(patch()), 662 "Illegal class patch at %d in class file %s", 663 index, CHECK); 664 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 665 cp->unresolved_klass_at_put(index, name); 666 } 667 break; 668 669 case JVM_CONSTANT_String : 670 // skip this patch and don't clear it. Needs the oop array for resolved 671 // references to be created first. 672 return; 673 674 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 675 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 676 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 677 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 678 patch_prim: 679 { 680 jvalue value; 681 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 682 guarantee_property(value_type == patch_type, 683 "Illegal primitive patch at %d in class file %s", 684 index, CHECK); 685 switch (value_type) { 686 case T_INT: cp->int_at_put(index, value.i); break; 687 case T_FLOAT: cp->float_at_put(index, value.f); break; 688 case T_LONG: cp->long_at_put(index, value.j); break; 689 case T_DOUBLE: cp->double_at_put(index, value.d); break; 690 default: assert(false, ""); 691 } 692 } 693 break; 694 695 default: 696 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 697 guarantee_property(!has_cp_patch_at(index), 698 "Illegal unexpected patch at %d in class file %s", 699 index, CHECK); 700 return; 701 } 702 703 // On fall-through, mark the patch as used. 704 clear_cp_patch_at(index); 705 } 706 707 708 709 class NameSigHash: public ResourceObj { 710 public: 711 Symbol* _name; // name 712 Symbol* _sig; // signature 713 NameSigHash* _next; // Next entry in hash table 714 }; 715 716 717 #define HASH_ROW_SIZE 256 718 719 unsigned int hash(Symbol* name, Symbol* sig) { 720 unsigned int raw_hash = 0; 721 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 722 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 723 724 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 725 } 726 727 728 void initialize_hashtable(NameSigHash** table) { 729 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 730 } 731 732 // Return false if the name/sig combination is found in table. 733 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 734 // The old format checker uses heap sort to find duplicates. 735 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 736 // of table since we don't expect Symbol*'s to move. 737 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 738 assert(name != NULL, "name in constant pool is NULL"); 739 740 // First lookup for duplicates 741 int index = hash(name, sig); 742 NameSigHash* entry = table[index]; 743 while (entry != NULL) { 744 if (entry->_name == name && entry->_sig == sig) { 745 return false; 746 } 747 entry = entry->_next; 748 } 749 750 // No duplicate is found, allocate a new entry and fill it. 751 entry = new NameSigHash(); 752 entry->_name = name; 753 entry->_sig = sig; 754 755 // Insert into hash table 756 entry->_next = table[index]; 757 table[index] = entry; 758 759 return true; 760 } 761 762 763 Array<Klass*>* ClassFileParser::parse_interfaces(int length, 764 Handle protection_domain, 765 Symbol* class_name, 766 bool* has_default_methods, 767 TRAPS) { 768 if (length == 0) { 769 _local_interfaces = Universe::the_empty_klass_array(); 770 } else { 771 ClassFileStream* cfs = stream(); 772 assert(length > 0, "only called for length>0"); 773 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 774 775 int index; 776 for (index = 0; index < length; index++) { 777 u2 interface_index = cfs->get_u2(CHECK_NULL); 778 KlassHandle interf; 779 check_property( 780 valid_klass_reference_at(interface_index), 781 "Interface name has bad constant pool index %u in class file %s", 782 interface_index, CHECK_NULL); 783 if (_cp->tag_at(interface_index).is_klass()) { 784 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 785 } else { 786 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 787 788 // Don't need to check legal name because it's checked when parsing constant pool. 789 // But need to make sure it's not an array type. 790 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 791 "Bad interface name in class file %s", CHECK_NULL); 792 Handle class_loader(THREAD, _loader_data->class_loader()); 793 794 // Call resolve_super so classcircularity is checked 795 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 796 unresolved_klass, class_loader, protection_domain, 797 false, CHECK_NULL); 798 interf = KlassHandle(THREAD, k); 799 } 800 801 if (!interf()->is_interface()) { 802 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 803 } 804 if (InstanceKlass::cast(interf())->has_default_methods()) { 805 *has_default_methods = true; 806 } 807 _local_interfaces->at_put(index, interf()); 808 } 809 810 if (!_need_verify || length <= 1) { 811 return _local_interfaces; 812 } 813 814 // Check if there's any duplicates in interfaces 815 ResourceMark rm(THREAD); 816 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 817 THREAD, NameSigHash*, HASH_ROW_SIZE); 818 initialize_hashtable(interface_names); 819 bool dup = false; 820 { 821 debug_only(No_Safepoint_Verifier nsv;) 822 for (index = 0; index < length; index++) { 823 Klass* k = _local_interfaces->at(index); 824 Symbol* name = InstanceKlass::cast(k)->name(); 825 // If no duplicates, add (name, NULL) in hashtable interface_names. 826 if (!put_after_lookup(name, NULL, interface_names)) { 827 dup = true; 828 break; 829 } 830 } 831 } 832 if (dup) { 833 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); 834 } 835 } 836 return _local_interfaces; 837 } 838 839 840 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 841 // Make sure the constant pool entry is of a type appropriate to this field 842 guarantee_property( 843 (constantvalue_index > 0 && 844 constantvalue_index < _cp->length()), 845 "Bad initial value index %u in ConstantValue attribute in class file %s", 846 constantvalue_index, CHECK); 847 constantTag value_type = _cp->tag_at(constantvalue_index); 848 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 849 case T_LONG: 850 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 851 break; 852 case T_FLOAT: 853 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 854 break; 855 case T_DOUBLE: 856 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 857 break; 858 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 859 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 860 break; 861 case T_OBJECT: 862 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 863 && value_type.is_string()), 864 "Bad string initial value in class file %s", CHECK); 865 break; 866 default: 867 classfile_parse_error( 868 "Unable to set initial value %u in class file %s", 869 constantvalue_index, CHECK); 870 } 871 } 872 873 874 // Parse attributes for a field. 875 void ClassFileParser::parse_field_attributes(u2 attributes_count, 876 bool is_static, u2 signature_index, 877 u2* constantvalue_index_addr, 878 bool* is_synthetic_addr, 879 u2* generic_signature_index_addr, 880 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 881 TRAPS) { 882 ClassFileStream* cfs = stream(); 883 assert(attributes_count > 0, "length should be greater than 0"); 884 u2 constantvalue_index = 0; 885 u2 generic_signature_index = 0; 886 bool is_synthetic = false; 887 u1* runtime_visible_annotations = NULL; 888 int runtime_visible_annotations_length = 0; 889 u1* runtime_invisible_annotations = NULL; 890 int runtime_invisible_annotations_length = 0; 891 u1* runtime_visible_type_annotations = NULL; 892 int runtime_visible_type_annotations_length = 0; 893 u1* runtime_invisible_type_annotations = NULL; 894 int runtime_invisible_type_annotations_length = 0; 895 bool runtime_invisible_type_annotations_exists = false; 896 while (attributes_count--) { 897 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 898 u2 attribute_name_index = cfs->get_u2_fast(); 899 u4 attribute_length = cfs->get_u4_fast(); 900 check_property(valid_symbol_at(attribute_name_index), 901 "Invalid field attribute index %u in class file %s", 902 attribute_name_index, 903 CHECK); 904 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 905 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 906 // ignore if non-static 907 if (constantvalue_index != 0) { 908 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 909 } 910 check_property( 911 attribute_length == 2, 912 "Invalid ConstantValue field attribute length %u in class file %s", 913 attribute_length, CHECK); 914 constantvalue_index = cfs->get_u2(CHECK); 915 if (_need_verify) { 916 verify_constantvalue(constantvalue_index, signature_index, CHECK); 917 } 918 } else if (attribute_name == vmSymbols::tag_synthetic()) { 919 if (attribute_length != 0) { 920 classfile_parse_error( 921 "Invalid Synthetic field attribute length %u in class file %s", 922 attribute_length, CHECK); 923 } 924 is_synthetic = true; 925 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 926 if (attribute_length != 0) { 927 classfile_parse_error( 928 "Invalid Deprecated field attribute length %u in class file %s", 929 attribute_length, CHECK); 930 } 931 } else if (_major_version >= JAVA_1_5_VERSION) { 932 if (attribute_name == vmSymbols::tag_signature()) { 933 if (attribute_length != 2) { 934 classfile_parse_error( 935 "Wrong size %u for field's Signature attribute in class file %s", 936 attribute_length, CHECK); 937 } 938 generic_signature_index = parse_generic_signature_attribute(CHECK); 939 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 940 runtime_visible_annotations_length = attribute_length; 941 runtime_visible_annotations = cfs->get_u1_buffer(); 942 assert(runtime_visible_annotations != NULL, "null visible annotations"); 943 parse_annotations(runtime_visible_annotations, 944 runtime_visible_annotations_length, 945 parsed_annotations, 946 CHECK); 947 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 948 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 949 runtime_invisible_annotations_length = attribute_length; 950 runtime_invisible_annotations = cfs->get_u1_buffer(); 951 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 952 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 953 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 954 if (runtime_visible_type_annotations != NULL) { 955 classfile_parse_error( 956 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 957 } 958 runtime_visible_type_annotations_length = attribute_length; 959 runtime_visible_type_annotations = cfs->get_u1_buffer(); 960 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 961 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 962 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 963 if (runtime_invisible_type_annotations_exists) { 964 classfile_parse_error( 965 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 966 } else { 967 runtime_invisible_type_annotations_exists = true; 968 } 969 if (PreserveAllAnnotations) { 970 runtime_invisible_type_annotations_length = attribute_length; 971 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 972 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 973 } 974 cfs->skip_u1(attribute_length, CHECK); 975 } else { 976 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 977 } 978 } else { 979 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 980 } 981 } 982 983 *constantvalue_index_addr = constantvalue_index; 984 *is_synthetic_addr = is_synthetic; 985 *generic_signature_index_addr = generic_signature_index; 986 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 987 runtime_visible_annotations_length, 988 runtime_invisible_annotations, 989 runtime_invisible_annotations_length, 990 CHECK); 991 parsed_annotations->set_field_annotations(a); 992 a = assemble_annotations(runtime_visible_type_annotations, 993 runtime_visible_type_annotations_length, 994 runtime_invisible_type_annotations, 995 runtime_invisible_type_annotations_length, 996 CHECK); 997 parsed_annotations->set_field_type_annotations(a); 998 return; 999 } 1000 1001 1002 // Field allocation types. Used for computing field offsets. 1003 1004 enum FieldAllocationType { 1005 STATIC_OOP, // Oops 1006 STATIC_BYTE, // Boolean, Byte, char 1007 STATIC_SHORT, // shorts 1008 STATIC_WORD, // ints 1009 STATIC_DOUBLE, // aligned long or double 1010 NONSTATIC_OOP, 1011 NONSTATIC_BYTE, 1012 NONSTATIC_SHORT, 1013 NONSTATIC_WORD, 1014 NONSTATIC_DOUBLE, 1015 MAX_FIELD_ALLOCATION_TYPE, 1016 BAD_ALLOCATION_TYPE = -1 1017 }; 1018 1019 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1020 BAD_ALLOCATION_TYPE, // 0 1021 BAD_ALLOCATION_TYPE, // 1 1022 BAD_ALLOCATION_TYPE, // 2 1023 BAD_ALLOCATION_TYPE, // 3 1024 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1025 NONSTATIC_SHORT, // T_CHAR = 5, 1026 NONSTATIC_WORD, // T_FLOAT = 6, 1027 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1028 NONSTATIC_BYTE, // T_BYTE = 8, 1029 NONSTATIC_SHORT, // T_SHORT = 9, 1030 NONSTATIC_WORD, // T_INT = 10, 1031 NONSTATIC_DOUBLE, // T_LONG = 11, 1032 NONSTATIC_OOP, // T_OBJECT = 12, 1033 NONSTATIC_OOP, // T_ARRAY = 13, 1034 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1035 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1036 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1037 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1038 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1039 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1040 BAD_ALLOCATION_TYPE, // 0 1041 BAD_ALLOCATION_TYPE, // 1 1042 BAD_ALLOCATION_TYPE, // 2 1043 BAD_ALLOCATION_TYPE, // 3 1044 STATIC_BYTE , // T_BOOLEAN = 4, 1045 STATIC_SHORT, // T_CHAR = 5, 1046 STATIC_WORD, // T_FLOAT = 6, 1047 STATIC_DOUBLE, // T_DOUBLE = 7, 1048 STATIC_BYTE, // T_BYTE = 8, 1049 STATIC_SHORT, // T_SHORT = 9, 1050 STATIC_WORD, // T_INT = 10, 1051 STATIC_DOUBLE, // T_LONG = 11, 1052 STATIC_OOP, // T_OBJECT = 12, 1053 STATIC_OOP, // T_ARRAY = 13, 1054 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1055 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1056 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1057 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1058 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1059 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1060 }; 1061 1062 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1063 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1064 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1065 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1066 return result; 1067 } 1068 1069 class FieldAllocationCount: public ResourceObj { 1070 public: 1071 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1072 1073 FieldAllocationCount() { 1074 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1075 count[i] = 0; 1076 } 1077 } 1078 1079 FieldAllocationType update(bool is_static, BasicType type) { 1080 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1081 // Make sure there is no overflow with injected fields. 1082 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1083 count[atype]++; 1084 return atype; 1085 } 1086 }; 1087 1088 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1089 bool is_interface, 1090 FieldAllocationCount *fac, 1091 u2* java_fields_count_ptr, TRAPS) { 1092 ClassFileStream* cfs = stream(); 1093 cfs->guarantee_more(2, CHECK_NULL); // length 1094 u2 length = cfs->get_u2_fast(); 1095 *java_fields_count_ptr = length; 1096 1097 int num_injected = 0; 1098 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1099 int total_fields = length + num_injected; 1100 1101 // The field array starts with tuples of shorts 1102 // [access, name index, sig index, initial value index, byte offset]. 1103 // A generic signature slot only exists for field with generic 1104 // signature attribute. And the access flag is set with 1105 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1106 // signature slots are at the end of the field array and after all 1107 // other fields data. 1108 // 1109 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1110 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1111 // ... 1112 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1113 // [generic signature index] 1114 // [generic signature index] 1115 // ... 1116 // 1117 // Allocate a temporary resource array for field data. For each field, 1118 // a slot is reserved in the temporary array for the generic signature 1119 // index. After parsing all fields, the data are copied to a permanent 1120 // array and any unused slots will be discarded. 1121 ResourceMark rm(THREAD); 1122 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1123 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1124 1125 // The generic signature slots start after all other fields' data. 1126 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1127 int num_generic_signature = 0; 1128 for (int n = 0; n < length; n++) { 1129 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1130 1131 AccessFlags access_flags; 1132 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1133 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1134 access_flags.set_flags(flags); 1135 1136 u2 name_index = cfs->get_u2_fast(); 1137 int cp_size = _cp->length(); 1138 check_property(valid_symbol_at(name_index), 1139 "Invalid constant pool index %u for field name in class file %s", 1140 name_index, 1141 CHECK_NULL); 1142 Symbol* name = _cp->symbol_at(name_index); 1143 verify_legal_field_name(name, CHECK_NULL); 1144 1145 u2 signature_index = cfs->get_u2_fast(); 1146 check_property(valid_symbol_at(signature_index), 1147 "Invalid constant pool index %u for field signature in class file %s", 1148 signature_index, CHECK_NULL); 1149 Symbol* sig = _cp->symbol_at(signature_index); 1150 verify_legal_field_signature(name, sig, CHECK_NULL); 1151 1152 u2 constantvalue_index = 0; 1153 bool is_synthetic = false; 1154 u2 generic_signature_index = 0; 1155 bool is_static = access_flags.is_static(); 1156 FieldAnnotationCollector parsed_annotations(_loader_data); 1157 1158 u2 attributes_count = cfs->get_u2_fast(); 1159 if (attributes_count > 0) { 1160 parse_field_attributes(attributes_count, is_static, signature_index, 1161 &constantvalue_index, &is_synthetic, 1162 &generic_signature_index, &parsed_annotations, 1163 CHECK_NULL); 1164 if (parsed_annotations.field_annotations() != NULL) { 1165 if (_fields_annotations == NULL) { 1166 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1167 _loader_data, length, NULL, 1168 CHECK_NULL); 1169 } 1170 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1171 parsed_annotations.set_field_annotations(NULL); 1172 } 1173 if (parsed_annotations.field_type_annotations() != NULL) { 1174 if (_fields_type_annotations == NULL) { 1175 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1176 _loader_data, length, NULL, 1177 CHECK_NULL); 1178 } 1179 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1180 parsed_annotations.set_field_type_annotations(NULL); 1181 } 1182 1183 if (is_synthetic) { 1184 access_flags.set_is_synthetic(); 1185 } 1186 if (generic_signature_index != 0) { 1187 access_flags.set_field_has_generic_signature(); 1188 fa[generic_signature_slot] = generic_signature_index; 1189 generic_signature_slot ++; 1190 num_generic_signature ++; 1191 } 1192 } 1193 1194 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1195 field->initialize(access_flags.as_short(), 1196 name_index, 1197 signature_index, 1198 constantvalue_index); 1199 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1200 1201 // Remember how many oops we encountered and compute allocation type 1202 FieldAllocationType atype = fac->update(is_static, type); 1203 field->set_allocation_type(atype); 1204 1205 // After field is initialized with type, we can augment it with aux info 1206 if (parsed_annotations.has_any_annotations()) 1207 parsed_annotations.apply_to(field); 1208 } 1209 1210 int index = length; 1211 if (num_injected != 0) { 1212 for (int n = 0; n < num_injected; n++) { 1213 // Check for duplicates 1214 if (injected[n].may_be_java) { 1215 Symbol* name = injected[n].name(); 1216 Symbol* signature = injected[n].signature(); 1217 bool duplicate = false; 1218 for (int i = 0; i < length; i++) { 1219 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1220 if (name == _cp->symbol_at(f->name_index()) && 1221 signature == _cp->symbol_at(f->signature_index())) { 1222 // Symbol is desclared in Java so skip this one 1223 duplicate = true; 1224 break; 1225 } 1226 } 1227 if (duplicate) { 1228 // These will be removed from the field array at the end 1229 continue; 1230 } 1231 } 1232 1233 // Injected field 1234 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1235 field->initialize(JVM_ACC_FIELD_INTERNAL, 1236 injected[n].name_index, 1237 injected[n].signature_index, 1238 0); 1239 1240 BasicType type = FieldType::basic_type(injected[n].signature()); 1241 1242 // Remember how many oops we encountered and compute allocation type 1243 FieldAllocationType atype = fac->update(false, type); 1244 field->set_allocation_type(atype); 1245 index++; 1246 } 1247 } 1248 1249 // Now copy the fields' data from the temporary resource array. 1250 // Sometimes injected fields already exist in the Java source so 1251 // the fields array could be too long. In that case the 1252 // fields array is trimed. Also unused slots that were reserved 1253 // for generic signature indexes are discarded. 1254 Array<u2>* fields = MetadataFactory::new_array<u2>( 1255 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1256 CHECK_NULL); 1257 _fields = fields; // save in case of error 1258 { 1259 int i = 0; 1260 for (; i < index * FieldInfo::field_slots; i++) { 1261 fields->at_put(i, fa[i]); 1262 } 1263 for (int j = total_fields * FieldInfo::field_slots; 1264 j < generic_signature_slot; j++) { 1265 fields->at_put(i++, fa[j]); 1266 } 1267 assert(i == fields->length(), ""); 1268 } 1269 1270 if (_need_verify && length > 1) { 1271 // Check duplicated fields 1272 ResourceMark rm(THREAD); 1273 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1274 THREAD, NameSigHash*, HASH_ROW_SIZE); 1275 initialize_hashtable(names_and_sigs); 1276 bool dup = false; 1277 { 1278 debug_only(No_Safepoint_Verifier nsv;) 1279 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1280 Symbol* name = fs.name(); 1281 Symbol* sig = fs.signature(); 1282 // If no duplicates, add name/signature in hashtable names_and_sigs. 1283 if (!put_after_lookup(name, sig, names_and_sigs)) { 1284 dup = true; 1285 break; 1286 } 1287 } 1288 } 1289 if (dup) { 1290 classfile_parse_error("Duplicate field name&signature in class file %s", 1291 CHECK_NULL); 1292 } 1293 } 1294 1295 return fields; 1296 } 1297 1298 1299 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1300 while (length-- > 0) { 1301 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1302 } 1303 } 1304 1305 1306 u2* ClassFileParser::parse_exception_table(u4 code_length, 1307 u4 exception_table_length, 1308 TRAPS) { 1309 ClassFileStream* cfs = stream(); 1310 1311 u2* exception_table_start = cfs->get_u2_buffer(); 1312 assert(exception_table_start != NULL, "null exception table"); 1313 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1314 // Will check legal target after parsing code array in verifier. 1315 if (_need_verify) { 1316 for (unsigned int i = 0; i < exception_table_length; i++) { 1317 u2 start_pc = cfs->get_u2_fast(); 1318 u2 end_pc = cfs->get_u2_fast(); 1319 u2 handler_pc = cfs->get_u2_fast(); 1320 u2 catch_type_index = cfs->get_u2_fast(); 1321 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1322 "Illegal exception table range in class file %s", 1323 CHECK_NULL); 1324 guarantee_property(handler_pc < code_length, 1325 "Illegal exception table handler in class file %s", 1326 CHECK_NULL); 1327 if (catch_type_index != 0) { 1328 guarantee_property(valid_klass_reference_at(catch_type_index), 1329 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1330 } 1331 } 1332 } else { 1333 cfs->skip_u2_fast(exception_table_length * 4); 1334 } 1335 return exception_table_start; 1336 } 1337 1338 void ClassFileParser::parse_linenumber_table( 1339 u4 code_attribute_length, u4 code_length, 1340 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1341 ClassFileStream* cfs = stream(); 1342 unsigned int num_entries = cfs->get_u2(CHECK); 1343 1344 // Each entry is a u2 start_pc, and a u2 line_number 1345 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1346 1347 // Verify line number attribute and table length 1348 check_property( 1349 code_attribute_length == sizeof(u2) + length_in_bytes, 1350 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1351 1352 cfs->guarantee_more(length_in_bytes, CHECK); 1353 1354 if ((*write_stream) == NULL) { 1355 if (length_in_bytes > fixed_buffer_size) { 1356 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1357 } else { 1358 (*write_stream) = new CompressedLineNumberWriteStream( 1359 linenumbertable_buffer, fixed_buffer_size); 1360 } 1361 } 1362 1363 while (num_entries-- > 0) { 1364 u2 bci = cfs->get_u2_fast(); // start_pc 1365 u2 line = cfs->get_u2_fast(); // line_number 1366 guarantee_property(bci < code_length, 1367 "Invalid pc in LineNumberTable in class file %s", CHECK); 1368 (*write_stream)->write_pair(bci, line); 1369 } 1370 } 1371 1372 1373 // Class file LocalVariableTable elements. 1374 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1375 public: 1376 u2 start_bci; 1377 u2 length; 1378 u2 name_cp_index; 1379 u2 descriptor_cp_index; 1380 u2 slot; 1381 }; 1382 1383 1384 class LVT_Hash: public CHeapObj<mtClass> { 1385 public: 1386 LocalVariableTableElement *_elem; // element 1387 LVT_Hash* _next; // Next entry in hash table 1388 }; 1389 1390 unsigned int hash(LocalVariableTableElement *elem) { 1391 unsigned int raw_hash = elem->start_bci; 1392 1393 raw_hash = elem->length + raw_hash * 37; 1394 raw_hash = elem->name_cp_index + raw_hash * 37; 1395 raw_hash = elem->slot + raw_hash * 37; 1396 1397 return raw_hash % HASH_ROW_SIZE; 1398 } 1399 1400 void initialize_hashtable(LVT_Hash** table) { 1401 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1402 table[i] = NULL; 1403 } 1404 } 1405 1406 void clear_hashtable(LVT_Hash** table) { 1407 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1408 LVT_Hash* current = table[i]; 1409 LVT_Hash* next; 1410 while (current != NULL) { 1411 next = current->_next; 1412 current->_next = NULL; 1413 delete(current); 1414 current = next; 1415 } 1416 table[i] = NULL; 1417 } 1418 } 1419 1420 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1421 LVT_Hash* entry = table[index]; 1422 1423 /* 1424 * 3-tuple start_bci/length/slot has to be unique key, 1425 * so the following comparison seems to be redundant: 1426 * && elem->name_cp_index == entry->_elem->name_cp_index 1427 */ 1428 while (entry != NULL) { 1429 if (elem->start_bci == entry->_elem->start_bci 1430 && elem->length == entry->_elem->length 1431 && elem->name_cp_index == entry->_elem->name_cp_index 1432 && elem->slot == entry->_elem->slot 1433 ) { 1434 return entry; 1435 } 1436 entry = entry->_next; 1437 } 1438 return NULL; 1439 } 1440 1441 // Return false if the local variable is found in table. 1442 // Return true if no duplicate is found. 1443 // And local variable is added as a new entry in table. 1444 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1445 // First lookup for duplicates 1446 int index = hash(elem); 1447 LVT_Hash* entry = LVT_lookup(elem, index, table); 1448 1449 if (entry != NULL) { 1450 return false; 1451 } 1452 // No duplicate is found, allocate a new entry and fill it. 1453 if ((entry = new LVT_Hash()) == NULL) { 1454 return false; 1455 } 1456 entry->_elem = elem; 1457 1458 // Insert into hash table 1459 entry->_next = table[index]; 1460 table[index] = entry; 1461 1462 return true; 1463 } 1464 1465 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1466 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1467 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1468 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1469 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1470 lvt->signature_cp_index = 0; 1471 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1472 } 1473 1474 // Function is used to parse both attributes: 1475 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1476 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1477 u2 max_locals, 1478 u4 code_attribute_length, 1479 u2* localvariable_table_length, 1480 bool isLVTT, 1481 TRAPS) { 1482 ClassFileStream* cfs = stream(); 1483 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1484 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1485 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1486 // Verify local variable table attribute has right length 1487 if (_need_verify) { 1488 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1489 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1490 } 1491 u2* localvariable_table_start = cfs->get_u2_buffer(); 1492 assert(localvariable_table_start != NULL, "null local variable table"); 1493 if (!_need_verify) { 1494 cfs->skip_u2_fast(size); 1495 } else { 1496 cfs->guarantee_more(size * 2, CHECK_NULL); 1497 for(int i = 0; i < (*localvariable_table_length); i++) { 1498 u2 start_pc = cfs->get_u2_fast(); 1499 u2 length = cfs->get_u2_fast(); 1500 u2 name_index = cfs->get_u2_fast(); 1501 u2 descriptor_index = cfs->get_u2_fast(); 1502 u2 index = cfs->get_u2_fast(); 1503 // Assign to a u4 to avoid overflow 1504 u4 end_pc = (u4)start_pc + (u4)length; 1505 1506 if (start_pc >= code_length) { 1507 classfile_parse_error( 1508 "Invalid start_pc %u in %s in class file %s", 1509 start_pc, tbl_name, CHECK_NULL); 1510 } 1511 if (end_pc > code_length) { 1512 classfile_parse_error( 1513 "Invalid length %u in %s in class file %s", 1514 length, tbl_name, CHECK_NULL); 1515 } 1516 int cp_size = _cp->length(); 1517 guarantee_property(valid_symbol_at(name_index), 1518 "Name index %u in %s has bad constant type in class file %s", 1519 name_index, tbl_name, CHECK_NULL); 1520 guarantee_property(valid_symbol_at(descriptor_index), 1521 "Signature index %u in %s has bad constant type in class file %s", 1522 descriptor_index, tbl_name, CHECK_NULL); 1523 1524 Symbol* name = _cp->symbol_at(name_index); 1525 Symbol* sig = _cp->symbol_at(descriptor_index); 1526 verify_legal_field_name(name, CHECK_NULL); 1527 u2 extra_slot = 0; 1528 if (!isLVTT) { 1529 verify_legal_field_signature(name, sig, CHECK_NULL); 1530 1531 // 4894874: check special cases for double and long local variables 1532 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1533 sig == vmSymbols::type_signature(T_LONG)) { 1534 extra_slot = 1; 1535 } 1536 } 1537 guarantee_property((index + extra_slot) < max_locals, 1538 "Invalid index %u in %s in class file %s", 1539 index, tbl_name, CHECK_NULL); 1540 } 1541 } 1542 return localvariable_table_start; 1543 } 1544 1545 1546 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1547 u1* u1_array, u2* u2_array, TRAPS) { 1548 ClassFileStream* cfs = stream(); 1549 u2 index = 0; // index in the array with long/double occupying two slots 1550 u4 i1 = *u1_index; 1551 u4 i2 = *u2_index + 1; 1552 for(int i = 0; i < array_length; i++) { 1553 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1554 index++; 1555 if (tag == ITEM_Long || tag == ITEM_Double) { 1556 index++; 1557 } else if (tag == ITEM_Object) { 1558 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1559 guarantee_property(valid_klass_reference_at(class_index), 1560 "Bad class index %u in StackMap in class file %s", 1561 class_index, CHECK); 1562 } else if (tag == ITEM_Uninitialized) { 1563 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1564 guarantee_property( 1565 offset < code_length, 1566 "Bad uninitialized type offset %u in StackMap in class file %s", 1567 offset, CHECK); 1568 } else { 1569 guarantee_property( 1570 tag <= (u1)ITEM_Uninitialized, 1571 "Unknown variable type %u in StackMap in class file %s", 1572 tag, CHECK); 1573 } 1574 } 1575 u2_array[*u2_index] = index; 1576 *u1_index = i1; 1577 *u2_index = i2; 1578 } 1579 1580 u1* ClassFileParser::parse_stackmap_table( 1581 u4 code_attribute_length, TRAPS) { 1582 if (code_attribute_length == 0) 1583 return NULL; 1584 1585 ClassFileStream* cfs = stream(); 1586 u1* stackmap_table_start = cfs->get_u1_buffer(); 1587 assert(stackmap_table_start != NULL, "null stackmap table"); 1588 1589 // check code_attribute_length first 1590 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1591 1592 if (!_need_verify && !DumpSharedSpaces) { 1593 return NULL; 1594 } 1595 return stackmap_table_start; 1596 } 1597 1598 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1599 u4 method_attribute_length, 1600 TRAPS) { 1601 ClassFileStream* cfs = stream(); 1602 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1603 *checked_exceptions_length = cfs->get_u2_fast(); 1604 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1605 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1606 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1607 if (!_need_verify) { 1608 cfs->skip_u2_fast(size); 1609 } else { 1610 // Verify each value in the checked exception table 1611 u2 checked_exception; 1612 u2 len = *checked_exceptions_length; 1613 cfs->guarantee_more(2 * len, CHECK_NULL); 1614 for (int i = 0; i < len; i++) { 1615 checked_exception = cfs->get_u2_fast(); 1616 check_property( 1617 valid_klass_reference_at(checked_exception), 1618 "Exception name has bad type at constant pool %u in class file %s", 1619 checked_exception, CHECK_NULL); 1620 } 1621 } 1622 // check exceptions attribute length 1623 if (_need_verify) { 1624 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1625 sizeof(u2) * size), 1626 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1627 } 1628 return checked_exceptions_start; 1629 } 1630 1631 void ClassFileParser::throwIllegalSignature( 1632 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1633 ResourceMark rm(THREAD); 1634 Exceptions::fthrow(THREAD_AND_LOCATION, 1635 vmSymbols::java_lang_ClassFormatError(), 1636 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1637 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1638 } 1639 1640 // Skip an annotation. Return >=limit if there is any problem. 1641 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1642 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1643 // value := switch (tag:u1) { ... } 1644 index += 2; // skip atype 1645 if ((index += 2) >= limit) return limit; // read nmem 1646 int nmem = Bytes::get_Java_u2(buffer+index-2); 1647 while (--nmem >= 0 && index < limit) { 1648 index += 2; // skip member 1649 index = skip_annotation_value(buffer, limit, index); 1650 } 1651 return index; 1652 } 1653 1654 // Skip an annotation value. Return >=limit if there is any problem. 1655 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1656 // value := switch (tag:u1) { 1657 // case B, C, I, S, Z, D, F, J, c: con:u2; 1658 // case e: e_class:u2 e_name:u2; 1659 // case s: s_con:u2; 1660 // case [: do(nval:u2) {value}; 1661 // case @: annotation; 1662 // case s: s_con:u2; 1663 // } 1664 if ((index += 1) >= limit) return limit; // read tag 1665 u1 tag = buffer[index-1]; 1666 switch (tag) { 1667 case 'B': case 'C': case 'I': case 'S': case 'Z': 1668 case 'D': case 'F': case 'J': case 'c': case 's': 1669 index += 2; // skip con or s_con 1670 break; 1671 case 'e': 1672 index += 4; // skip e_class, e_name 1673 break; 1674 case '[': 1675 { 1676 if ((index += 2) >= limit) return limit; // read nval 1677 int nval = Bytes::get_Java_u2(buffer+index-2); 1678 while (--nval >= 0 && index < limit) { 1679 index = skip_annotation_value(buffer, limit, index); 1680 } 1681 } 1682 break; 1683 case '@': 1684 index = skip_annotation(buffer, limit, index); 1685 break; 1686 default: 1687 assert(false, "annotation tag"); 1688 return limit; // bad tag byte 1689 } 1690 return index; 1691 } 1692 1693 // Sift through annotations, looking for those significant to the VM: 1694 void ClassFileParser::parse_annotations(u1* buffer, int limit, 1695 ClassFileParser::AnnotationCollector* coll, 1696 TRAPS) { 1697 // annotations := do(nann:u2) {annotation} 1698 int index = 0; 1699 if ((index += 2) >= limit) return; // read nann 1700 int nann = Bytes::get_Java_u2(buffer+index-2); 1701 enum { // initial annotation layout 1702 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1703 count_off = 2, // u2 such as 1 (one value) 1704 member_off = 4, // utf8 such as 'value' 1705 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1706 e_tag_val = 'e', 1707 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1708 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1709 e_size = 11, // end of 'e' annotation 1710 c_tag_val = 'c', // payload is type 1711 c_con_off = 7, // utf8 payload, such as 'I' 1712 c_size = 9, // end of 'c' annotation 1713 s_tag_val = 's', // payload is String 1714 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1715 s_size = 9, 1716 min_size = 6 // smallest possible size (zero members) 1717 }; 1718 while ((--nann) >= 0 && (index-2 + min_size <= limit)) { 1719 int index0 = index; 1720 index = skip_annotation(buffer, limit, index); 1721 u1* abase = buffer + index0; 1722 int atype = Bytes::get_Java_u2(abase + atype_off); 1723 int count = Bytes::get_Java_u2(abase + count_off); 1724 Symbol* aname = check_symbol_at(_cp, atype); 1725 if (aname == NULL) break; // invalid annotation name 1726 Symbol* member = NULL; 1727 if (count >= 1) { 1728 int member_index = Bytes::get_Java_u2(abase + member_off); 1729 member = check_symbol_at(_cp, member_index); 1730 if (member == NULL) break; // invalid member name 1731 } 1732 1733 // Here is where parsing particular annotations will take place. 1734 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1735 if (id == AnnotationCollector::_unknown) continue; 1736 coll->set_annotation(id); 1737 1738 if (id == AnnotationCollector::_sun_misc_Contended) { 1739 // @Contended can optionally specify the contention group. 1740 // 1741 // Contended group defines the equivalence class over the fields: 1742 // the fields within the same contended group are not treated distinct. 1743 // The only exception is default group, which does not incur the 1744 // equivalence. Naturally, contention group for classes is meaningless. 1745 // 1746 // While the contention group is specified as String, annotation 1747 // values are already interned, and we might as well use the constant 1748 // pool index as the group tag. 1749 // 1750 u2 group_index = 0; // default contended group 1751 if (count == 1 1752 && s_size == (index - index0) // match size 1753 && s_tag_val == *(abase + tag_off) 1754 && member == vmSymbols::value_name()) { 1755 group_index = Bytes::get_Java_u2(abase + s_con_off); 1756 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1757 group_index = 0; // default contended group 1758 } 1759 } 1760 coll->set_contended_group(group_index); 1761 } 1762 } 1763 } 1764 1765 ClassFileParser::AnnotationCollector::ID 1766 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1767 Symbol* name) { 1768 vmSymbols::SID sid = vmSymbols::find_sid(name); 1769 // Privileged code can use all annotations. Other code silently drops some. 1770 const bool privileged = loader_data->is_the_null_class_loader_data() || 1771 loader_data->is_ext_class_loader_data() || 1772 loader_data->is_anonymous(); 1773 switch (sid) { 1774 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1775 if (_location != _in_method) break; // only allow for methods 1776 if (!privileged) break; // only allow in privileged code 1777 return _method_CallerSensitive; 1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1779 if (_location != _in_method) break; // only allow for methods 1780 if (!privileged) break; // only allow in privileged code 1781 return _method_ForceInline; 1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1783 if (_location != _in_method) break; // only allow for methods 1784 if (!privileged) break; // only allow in privileged code 1785 return _method_DontInline; 1786 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1787 if (_location != _in_method) break; // only allow for methods 1788 if (!privileged) break; // only allow in privileged code 1789 return _method_LambdaForm_Compiled; 1790 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1791 if (_location != _in_method) break; // only allow for methods 1792 if (!privileged) break; // only allow in privileged code 1793 return _method_LambdaForm_Hidden; 1794 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): 1795 if (_location != _in_field) break; // only allow for fields 1796 if (!privileged) break; // only allow in privileged code 1797 return _field_Stable; 1798 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1799 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1800 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1801 return _sun_misc_Contended; 1802 default: break; 1803 } 1804 return AnnotationCollector::_unknown; 1805 } 1806 1807 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1808 if (is_contended()) 1809 f->set_contended_group(contended_group()); 1810 if (is_stable()) 1811 f->set_stable(true); 1812 } 1813 1814 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1815 // If there's an error deallocate metadata for field annotations 1816 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1817 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1818 } 1819 1820 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1821 if (has_annotation(_method_CallerSensitive)) 1822 m->set_caller_sensitive(true); 1823 if (has_annotation(_method_ForceInline)) 1824 m->set_force_inline(true); 1825 if (has_annotation(_method_DontInline)) 1826 m->set_dont_inline(true); 1827 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1828 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1829 if (has_annotation(_method_LambdaForm_Hidden)) 1830 m->set_hidden(true); 1831 } 1832 1833 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1834 k->set_is_contended(is_contended()); 1835 } 1836 1837 1838 #define MAX_ARGS_SIZE 255 1839 #define MAX_CODE_SIZE 65535 1840 #define INITIAL_MAX_LVT_NUMBER 256 1841 1842 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1843 * 1844 * Rules for LVT's and LVTT's are: 1845 * - There can be any number of LVT's and LVTT's. 1846 * - If there are n LVT's, it is the same as if there was just 1847 * one LVT containing all the entries from the n LVT's. 1848 * - There may be no more than one LVT entry per local variable. 1849 * Two LVT entries are 'equal' if these fields are the same: 1850 * start_pc, length, name, slot 1851 * - There may be no more than one LVTT entry per each LVT entry. 1852 * Each LVTT entry has to match some LVT entry. 1853 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1854 */ 1855 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1856 int lvt_cnt, 1857 u2* localvariable_table_length, 1858 u2** localvariable_table_start, 1859 int lvtt_cnt, 1860 u2* localvariable_type_table_length, 1861 u2** localvariable_type_table_start, 1862 TRAPS) { 1863 1864 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1865 initialize_hashtable(lvt_Hash); 1866 1867 // To fill LocalVariableTable in 1868 Classfile_LVT_Element* cf_lvt; 1869 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1870 1871 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1872 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1873 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1874 copy_lvt_element(&cf_lvt[idx], lvt); 1875 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1876 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1877 && _need_verify 1878 && _major_version >= JAVA_1_5_VERSION) { 1879 clear_hashtable(lvt_Hash); 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 int index = hash(&lvtt_elem); 1897 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1898 if (entry == NULL) { 1899 if (_need_verify) { 1900 clear_hashtable(lvt_Hash); 1901 classfile_parse_error("LVTT entry for '%s' in class file %s " 1902 "does not match any LVT entry", 1903 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1904 CHECK); 1905 } 1906 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1907 clear_hashtable(lvt_Hash); 1908 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1909 "entry for '%s' in class file %s", 1910 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1911 CHECK); 1912 } else { 1913 // to add generic signatures into LocalVariableTable 1914 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1915 } 1916 } 1917 } 1918 clear_hashtable(lvt_Hash); 1919 } 1920 1921 1922 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1923 u1* runtime_visible_annotations, 1924 int runtime_visible_annotations_length, 1925 u1* runtime_invisible_annotations, 1926 int runtime_invisible_annotations_length, 1927 u1* runtime_visible_parameter_annotations, 1928 int runtime_visible_parameter_annotations_length, 1929 u1* runtime_invisible_parameter_annotations, 1930 int runtime_invisible_parameter_annotations_length, 1931 u1* runtime_visible_type_annotations, 1932 int runtime_visible_type_annotations_length, 1933 u1* runtime_invisible_type_annotations, 1934 int runtime_invisible_type_annotations_length, 1935 u1* annotation_default, 1936 int annotation_default_length, 1937 TRAPS) { 1938 1939 AnnotationArray* a; 1940 1941 if (runtime_visible_annotations_length + 1942 runtime_invisible_annotations_length > 0) { 1943 a = assemble_annotations(runtime_visible_annotations, 1944 runtime_visible_annotations_length, 1945 runtime_invisible_annotations, 1946 runtime_invisible_annotations_length, 1947 CHECK); 1948 cm->set_method_annotations(a); 1949 } 1950 1951 if (runtime_visible_parameter_annotations_length + 1952 runtime_invisible_parameter_annotations_length > 0) { 1953 a = assemble_annotations(runtime_visible_parameter_annotations, 1954 runtime_visible_parameter_annotations_length, 1955 runtime_invisible_parameter_annotations, 1956 runtime_invisible_parameter_annotations_length, 1957 CHECK); 1958 cm->set_parameter_annotations(a); 1959 } 1960 1961 if (annotation_default_length > 0) { 1962 a = assemble_annotations(annotation_default, 1963 annotation_default_length, 1964 NULL, 1965 0, 1966 CHECK); 1967 cm->set_default_annotations(a); 1968 } 1969 1970 if (runtime_visible_type_annotations_length + 1971 runtime_invisible_type_annotations_length > 0) { 1972 a = assemble_annotations(runtime_visible_type_annotations, 1973 runtime_visible_type_annotations_length, 1974 runtime_invisible_type_annotations, 1975 runtime_invisible_type_annotations_length, 1976 CHECK); 1977 cm->set_type_annotations(a); 1978 } 1979 } 1980 1981 1982 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1983 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1984 // Method* to save footprint, so we only know the size of the resulting Method* when the 1985 // entire method attribute is parsed. 1986 // 1987 // The promoted_flags parameter is used to pass relevant access_flags 1988 // from the method back up to the containing klass. These flag values 1989 // are added to klass's access_flags. 1990 1991 methodHandle ClassFileParser::parse_method(bool is_interface, 1992 AccessFlags *promoted_flags, 1993 TRAPS) { 1994 ClassFileStream* cfs = stream(); 1995 methodHandle nullHandle; 1996 ResourceMark rm(THREAD); 1997 // Parse fixed parts 1998 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1999 2000 int flags = cfs->get_u2_fast(); 2001 u2 name_index = cfs->get_u2_fast(); 2002 int cp_size = _cp->length(); 2003 check_property( 2004 valid_symbol_at(name_index), 2005 "Illegal constant pool index %u for method name in class file %s", 2006 name_index, CHECK_(nullHandle)); 2007 Symbol* name = _cp->symbol_at(name_index); 2008 verify_legal_method_name(name, CHECK_(nullHandle)); 2009 2010 u2 signature_index = cfs->get_u2_fast(); 2011 guarantee_property( 2012 valid_symbol_at(signature_index), 2013 "Illegal constant pool index %u for method signature in class file %s", 2014 signature_index, CHECK_(nullHandle)); 2015 Symbol* signature = _cp->symbol_at(signature_index); 2016 2017 AccessFlags access_flags; 2018 if (name == vmSymbols::class_initializer_name()) { 2019 // We ignore the other access flags for a valid class initializer. 2020 // (JVM Spec 2nd ed., chapter 4.6) 2021 if (_major_version < 51) { // backward compatibility 2022 flags = JVM_ACC_STATIC; 2023 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2024 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2025 } 2026 } else { 2027 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2028 } 2029 2030 int args_size = -1; // only used when _need_verify is true 2031 if (_need_verify) { 2032 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2033 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2034 if (args_size > MAX_ARGS_SIZE) { 2035 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2036 } 2037 } 2038 2039 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2040 2041 // Default values for code and exceptions attribute elements 2042 u2 max_stack = 0; 2043 u2 max_locals = 0; 2044 u4 code_length = 0; 2045 u1* code_start = 0; 2046 u2 exception_table_length = 0; 2047 u2* exception_table_start = NULL; 2048 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2049 u2 checked_exceptions_length = 0; 2050 u2* checked_exceptions_start = NULL; 2051 CompressedLineNumberWriteStream* linenumber_table = NULL; 2052 int linenumber_table_length = 0; 2053 int total_lvt_length = 0; 2054 u2 lvt_cnt = 0; 2055 u2 lvtt_cnt = 0; 2056 bool lvt_allocated = false; 2057 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2058 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2059 u2* localvariable_table_length; 2060 u2** localvariable_table_start; 2061 u2* localvariable_type_table_length; 2062 u2** localvariable_type_table_start; 2063 u2 method_parameters_length = 0; 2064 u1* method_parameters_data = NULL; 2065 bool method_parameters_seen = false; 2066 bool parsed_code_attribute = false; 2067 bool parsed_checked_exceptions_attribute = false; 2068 bool parsed_stackmap_attribute = false; 2069 // stackmap attribute - JDK1.5 2070 u1* stackmap_data = NULL; 2071 int stackmap_data_length = 0; 2072 u2 generic_signature_index = 0; 2073 MethodAnnotationCollector parsed_annotations; 2074 u1* runtime_visible_annotations = NULL; 2075 int runtime_visible_annotations_length = 0; 2076 u1* runtime_invisible_annotations = NULL; 2077 int runtime_invisible_annotations_length = 0; 2078 u1* runtime_visible_parameter_annotations = NULL; 2079 int runtime_visible_parameter_annotations_length = 0; 2080 u1* runtime_invisible_parameter_annotations = NULL; 2081 int runtime_invisible_parameter_annotations_length = 0; 2082 u1* runtime_visible_type_annotations = NULL; 2083 int runtime_visible_type_annotations_length = 0; 2084 u1* runtime_invisible_type_annotations = NULL; 2085 int runtime_invisible_type_annotations_length = 0; 2086 bool runtime_invisible_type_annotations_exists = false; 2087 u1* annotation_default = NULL; 2088 int annotation_default_length = 0; 2089 2090 // Parse code and exceptions attribute 2091 u2 method_attributes_count = cfs->get_u2_fast(); 2092 while (method_attributes_count--) { 2093 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2094 u2 method_attribute_name_index = cfs->get_u2_fast(); 2095 u4 method_attribute_length = cfs->get_u4_fast(); 2096 check_property( 2097 valid_symbol_at(method_attribute_name_index), 2098 "Invalid method attribute name index %u in class file %s", 2099 method_attribute_name_index, CHECK_(nullHandle)); 2100 2101 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2102 if (method_attribute_name == vmSymbols::tag_code()) { 2103 // Parse Code attribute 2104 if (_need_verify) { 2105 guarantee_property( 2106 !access_flags.is_native() && !access_flags.is_abstract(), 2107 "Code attribute in native or abstract methods in class file %s", 2108 CHECK_(nullHandle)); 2109 } 2110 if (parsed_code_attribute) { 2111 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2112 } 2113 parsed_code_attribute = true; 2114 2115 // Stack size, locals size, and code size 2116 if (_major_version == 45 && _minor_version <= 2) { 2117 cfs->guarantee_more(4, CHECK_(nullHandle)); 2118 max_stack = cfs->get_u1_fast(); 2119 max_locals = cfs->get_u1_fast(); 2120 code_length = cfs->get_u2_fast(); 2121 } else { 2122 cfs->guarantee_more(8, CHECK_(nullHandle)); 2123 max_stack = cfs->get_u2_fast(); 2124 max_locals = cfs->get_u2_fast(); 2125 code_length = cfs->get_u4_fast(); 2126 } 2127 if (_need_verify) { 2128 guarantee_property(args_size <= max_locals, 2129 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2130 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2131 "Invalid method Code length %u in class file %s", 2132 code_length, CHECK_(nullHandle)); 2133 } 2134 // Code pointer 2135 code_start = cfs->get_u1_buffer(); 2136 assert(code_start != NULL, "null code start"); 2137 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2138 cfs->skip_u1_fast(code_length); 2139 2140 // Exception handler table 2141 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2142 exception_table_length = cfs->get_u2_fast(); 2143 if (exception_table_length > 0) { 2144 exception_table_start = 2145 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2146 } 2147 2148 // Parse additional attributes in code attribute 2149 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2150 u2 code_attributes_count = cfs->get_u2_fast(); 2151 2152 unsigned int calculated_attribute_length = 0; 2153 2154 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2155 calculated_attribute_length = 2156 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2157 } else { 2158 // max_stack, locals and length are smaller in pre-version 45.2 classes 2159 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2160 } 2161 calculated_attribute_length += 2162 code_length + 2163 sizeof(exception_table_length) + 2164 sizeof(code_attributes_count) + 2165 exception_table_length * 2166 ( sizeof(u2) + // start_pc 2167 sizeof(u2) + // end_pc 2168 sizeof(u2) + // handler_pc 2169 sizeof(u2) ); // catch_type_index 2170 2171 while (code_attributes_count--) { 2172 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2173 u2 code_attribute_name_index = cfs->get_u2_fast(); 2174 u4 code_attribute_length = cfs->get_u4_fast(); 2175 calculated_attribute_length += code_attribute_length + 2176 sizeof(code_attribute_name_index) + 2177 sizeof(code_attribute_length); 2178 check_property(valid_symbol_at(code_attribute_name_index), 2179 "Invalid code attribute name index %u in class file %s", 2180 code_attribute_name_index, 2181 CHECK_(nullHandle)); 2182 if (LoadLineNumberTables && 2183 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2184 // Parse and compress line number table 2185 parse_linenumber_table(code_attribute_length, code_length, 2186 &linenumber_table, CHECK_(nullHandle)); 2187 2188 } else if (LoadLocalVariableTables && 2189 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2190 // Parse local variable table 2191 if (!lvt_allocated) { 2192 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2193 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2194 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2195 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2196 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2197 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2198 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2199 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2200 lvt_allocated = true; 2201 } 2202 if (lvt_cnt == max_lvt_cnt) { 2203 max_lvt_cnt <<= 1; 2204 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2205 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2206 } 2207 localvariable_table_start[lvt_cnt] = 2208 parse_localvariable_table(code_length, 2209 max_locals, 2210 code_attribute_length, 2211 &localvariable_table_length[lvt_cnt], 2212 false, // is not LVTT 2213 CHECK_(nullHandle)); 2214 total_lvt_length += localvariable_table_length[lvt_cnt]; 2215 lvt_cnt++; 2216 } else if (LoadLocalVariableTypeTables && 2217 _major_version >= JAVA_1_5_VERSION && 2218 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2219 if (!lvt_allocated) { 2220 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2221 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2222 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2223 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2224 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2225 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2226 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2227 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2228 lvt_allocated = true; 2229 } 2230 // Parse local variable type table 2231 if (lvtt_cnt == max_lvtt_cnt) { 2232 max_lvtt_cnt <<= 1; 2233 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2234 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2235 } 2236 localvariable_type_table_start[lvtt_cnt] = 2237 parse_localvariable_table(code_length, 2238 max_locals, 2239 code_attribute_length, 2240 &localvariable_type_table_length[lvtt_cnt], 2241 true, // is LVTT 2242 CHECK_(nullHandle)); 2243 lvtt_cnt++; 2244 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2245 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2246 // Stack map is only needed by the new verifier in JDK1.5. 2247 if (parsed_stackmap_attribute) { 2248 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2249 } 2250 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2251 stackmap_data_length = code_attribute_length; 2252 parsed_stackmap_attribute = true; 2253 } else { 2254 // Skip unknown attributes 2255 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2256 } 2257 } 2258 // check method attribute length 2259 if (_need_verify) { 2260 guarantee_property(method_attribute_length == calculated_attribute_length, 2261 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2262 } 2263 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2264 // Parse Exceptions attribute 2265 if (parsed_checked_exceptions_attribute) { 2266 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2267 } 2268 parsed_checked_exceptions_attribute = true; 2269 checked_exceptions_start = 2270 parse_checked_exceptions(&checked_exceptions_length, 2271 method_attribute_length, 2272 CHECK_(nullHandle)); 2273 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2274 // reject multiple method parameters 2275 if (method_parameters_seen) { 2276 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2277 } 2278 method_parameters_seen = true; 2279 method_parameters_length = cfs->get_u1_fast(); 2280 if (method_attribute_length != (method_parameters_length * 4u) + 1u) { 2281 classfile_parse_error( 2282 "Invalid MethodParameters method attribute length %u in class file", 2283 method_attribute_length, CHECK_(nullHandle)); 2284 } 2285 method_parameters_data = cfs->get_u1_buffer(); 2286 cfs->skip_u2_fast(method_parameters_length); 2287 cfs->skip_u2_fast(method_parameters_length); 2288 // ignore this attribute if it cannot be reflected 2289 if (!SystemDictionary::Parameter_klass_loaded()) 2290 method_parameters_length = 0; 2291 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2292 if (method_attribute_length != 0) { 2293 classfile_parse_error( 2294 "Invalid Synthetic method attribute length %u in class file %s", 2295 method_attribute_length, CHECK_(nullHandle)); 2296 } 2297 // Should we check that there hasn't already been a synthetic attribute? 2298 access_flags.set_is_synthetic(); 2299 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2300 if (method_attribute_length != 0) { 2301 classfile_parse_error( 2302 "Invalid Deprecated method attribute length %u in class file %s", 2303 method_attribute_length, CHECK_(nullHandle)); 2304 } 2305 } else if (_major_version >= JAVA_1_5_VERSION) { 2306 if (method_attribute_name == vmSymbols::tag_signature()) { 2307 if (method_attribute_length != 2) { 2308 classfile_parse_error( 2309 "Invalid Signature attribute length %u in class file %s", 2310 method_attribute_length, CHECK_(nullHandle)); 2311 } 2312 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); 2313 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2314 runtime_visible_annotations_length = method_attribute_length; 2315 runtime_visible_annotations = cfs->get_u1_buffer(); 2316 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2317 parse_annotations(runtime_visible_annotations, 2318 runtime_visible_annotations_length, &parsed_annotations, 2319 CHECK_(nullHandle)); 2320 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2321 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2322 runtime_invisible_annotations_length = method_attribute_length; 2323 runtime_invisible_annotations = cfs->get_u1_buffer(); 2324 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2325 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 2326 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2327 runtime_visible_parameter_annotations_length = method_attribute_length; 2328 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2329 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2330 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2331 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2332 runtime_invisible_parameter_annotations_length = method_attribute_length; 2333 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2334 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2335 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 2336 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2337 annotation_default_length = method_attribute_length; 2338 annotation_default = cfs->get_u1_buffer(); 2339 assert(annotation_default != NULL, "null annotation default"); 2340 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2341 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2342 if (runtime_visible_type_annotations != NULL) { 2343 classfile_parse_error( 2344 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2345 CHECK_(nullHandle)); 2346 } 2347 runtime_visible_type_annotations_length = method_attribute_length; 2348 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2349 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2350 // No need for the VM to parse Type annotations 2351 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2352 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2353 if (runtime_invisible_type_annotations_exists) { 2354 classfile_parse_error( 2355 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2356 CHECK_(nullHandle)); 2357 } else { 2358 runtime_invisible_type_annotations_exists = true; 2359 } 2360 if (PreserveAllAnnotations) { 2361 runtime_invisible_type_annotations_length = method_attribute_length; 2362 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2363 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2364 } 2365 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2366 } else { 2367 // Skip unknown attributes 2368 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2369 } 2370 } else { 2371 // Skip unknown attributes 2372 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2373 } 2374 } 2375 2376 if (linenumber_table != NULL) { 2377 linenumber_table->write_terminator(); 2378 linenumber_table_length = linenumber_table->position(); 2379 } 2380 2381 // Make sure there's at least one Code attribute in non-native/non-abstract method 2382 if (_need_verify) { 2383 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2384 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2385 } 2386 2387 // All sizing information for a Method* is finally available, now create it 2388 InlineTableSizes sizes( 2389 total_lvt_length, 2390 linenumber_table_length, 2391 exception_table_length, 2392 checked_exceptions_length, 2393 method_parameters_length, 2394 generic_signature_index, 2395 runtime_visible_annotations_length + 2396 runtime_invisible_annotations_length, 2397 runtime_visible_parameter_annotations_length + 2398 runtime_invisible_parameter_annotations_length, 2399 runtime_visible_type_annotations_length + 2400 runtime_invisible_type_annotations_length, 2401 annotation_default_length, 2402 0); 2403 2404 Method* m = Method::allocate( 2405 _loader_data, code_length, access_flags, &sizes, 2406 ConstMethod::NORMAL, CHECK_(nullHandle)); 2407 2408 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2409 2410 // Fill in information from fixed part (access_flags already set) 2411 m->set_constants(_cp); 2412 m->set_name_index(name_index); 2413 m->set_signature_index(signature_index); 2414 #ifdef CC_INTERP 2415 // hmm is there a gc issue here?? 2416 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2417 m->set_result_index(rtf.type()); 2418 #endif 2419 2420 if (args_size >= 0) { 2421 m->set_size_of_parameters(args_size); 2422 } else { 2423 m->compute_size_of_parameters(THREAD); 2424 } 2425 #ifdef ASSERT 2426 if (args_size >= 0) { 2427 m->compute_size_of_parameters(THREAD); 2428 assert(args_size == m->size_of_parameters(), ""); 2429 } 2430 #endif 2431 2432 // Fill in code attribute information 2433 m->set_max_stack(max_stack); 2434 m->set_max_locals(max_locals); 2435 if (stackmap_data != NULL) { 2436 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2437 stackmap_data_length, CHECK_NULL); 2438 } 2439 2440 // Copy byte codes 2441 m->set_code(code_start); 2442 2443 // Copy line number table 2444 if (linenumber_table != NULL) { 2445 memcpy(m->compressed_linenumber_table(), 2446 linenumber_table->buffer(), linenumber_table_length); 2447 } 2448 2449 // Copy exception table 2450 if (exception_table_length > 0) { 2451 int size = 2452 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2453 copy_u2_with_conversion((u2*) m->exception_table_start(), 2454 exception_table_start, size); 2455 } 2456 2457 // Copy method parameters 2458 if (method_parameters_length > 0) { 2459 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2460 for (int i = 0; i < method_parameters_length; i++) { 2461 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2462 method_parameters_data += 2; 2463 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2464 method_parameters_data += 2; 2465 } 2466 } 2467 2468 // Copy checked exceptions 2469 if (checked_exceptions_length > 0) { 2470 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2471 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2472 } 2473 2474 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2475 if (total_lvt_length > 0) { 2476 promoted_flags->set_has_localvariable_table(); 2477 copy_localvariable_table(m->constMethod(), lvt_cnt, 2478 localvariable_table_length, 2479 localvariable_table_start, 2480 lvtt_cnt, 2481 localvariable_type_table_length, 2482 localvariable_type_table_start, CHECK_NULL); 2483 } 2484 2485 if (parsed_annotations.has_any_annotations()) 2486 parsed_annotations.apply_to(m); 2487 2488 // Copy annotations 2489 copy_method_annotations(m->constMethod(), 2490 runtime_visible_annotations, 2491 runtime_visible_annotations_length, 2492 runtime_invisible_annotations, 2493 runtime_invisible_annotations_length, 2494 runtime_visible_parameter_annotations, 2495 runtime_visible_parameter_annotations_length, 2496 runtime_invisible_parameter_annotations, 2497 runtime_invisible_parameter_annotations_length, 2498 runtime_visible_type_annotations, 2499 runtime_visible_type_annotations_length, 2500 runtime_invisible_type_annotations, 2501 runtime_invisible_type_annotations_length, 2502 annotation_default, 2503 annotation_default_length, 2504 CHECK_NULL); 2505 2506 if (name == vmSymbols::finalize_method_name() && 2507 signature == vmSymbols::void_method_signature()) { 2508 if (m->is_empty_method()) { 2509 _has_empty_finalizer = true; 2510 } else { 2511 _has_finalizer = true; 2512 } 2513 } 2514 if (name == vmSymbols::object_initializer_name() && 2515 signature == vmSymbols::void_method_signature() && 2516 m->is_vanilla_constructor()) { 2517 _has_vanilla_constructor = true; 2518 } 2519 2520 NOT_PRODUCT(m->verify()); 2521 return m; 2522 } 2523 2524 2525 // The promoted_flags parameter is used to pass relevant access_flags 2526 // from the methods back up to the containing klass. These flag values 2527 // are added to klass's access_flags. 2528 2529 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2530 AccessFlags* promoted_flags, 2531 bool* has_final_method, 2532 bool* has_default_methods, 2533 TRAPS) { 2534 ClassFileStream* cfs = stream(); 2535 cfs->guarantee_more(2, CHECK_NULL); // length 2536 u2 length = cfs->get_u2_fast(); 2537 if (length == 0) { 2538 _methods = Universe::the_empty_method_array(); 2539 } else { 2540 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2541 2542 HandleMark hm(THREAD); 2543 for (int index = 0; index < length; index++) { 2544 methodHandle method = parse_method(is_interface, 2545 promoted_flags, 2546 CHECK_NULL); 2547 2548 if (method->is_final()) { 2549 *has_final_method = true; 2550 } 2551 if (is_interface && !(*has_default_methods) 2552 && !method->is_abstract() && !method->is_static() 2553 && !method->is_private()) { 2554 // default method 2555 *has_default_methods = true; 2556 } 2557 _methods->at_put(index, method()); 2558 } 2559 2560 if (_need_verify && length > 1) { 2561 // Check duplicated methods 2562 ResourceMark rm(THREAD); 2563 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2564 THREAD, NameSigHash*, HASH_ROW_SIZE); 2565 initialize_hashtable(names_and_sigs); 2566 bool dup = false; 2567 { 2568 debug_only(No_Safepoint_Verifier nsv;) 2569 for (int i = 0; i < length; i++) { 2570 Method* m = _methods->at(i); 2571 // If no duplicates, add name/signature in hashtable names_and_sigs. 2572 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2573 dup = true; 2574 break; 2575 } 2576 } 2577 } 2578 if (dup) { 2579 classfile_parse_error("Duplicate method name&signature in class file %s", 2580 CHECK_NULL); 2581 } 2582 } 2583 } 2584 return _methods; 2585 } 2586 2587 2588 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2589 int length = methods->length(); 2590 // If JVMTI original method ordering or sharing is enabled we have to 2591 // remember the original class file ordering. 2592 // We temporarily use the vtable_index field in the Method* to store the 2593 // class file index, so we can read in after calling qsort. 2594 // Put the method ordering in the shared archive. 2595 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2596 for (int index = 0; index < length; index++) { 2597 Method* m = methods->at(index); 2598 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2599 m->set_vtable_index(index); 2600 } 2601 } 2602 // Sort method array by ascending method name (for faster lookups & vtable construction) 2603 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2604 Method::sort_methods(methods); 2605 2606 intArray* method_ordering = NULL; 2607 // If JVMTI original method ordering or sharing is enabled construct int 2608 // array remembering the original ordering 2609 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2610 method_ordering = new intArray(length); 2611 for (int index = 0; index < length; index++) { 2612 Method* m = methods->at(index); 2613 int old_index = m->vtable_index(); 2614 assert(old_index >= 0 && old_index < length, "invalid method index"); 2615 method_ordering->at_put(index, old_index); 2616 m->set_vtable_index(Method::invalid_vtable_index); 2617 } 2618 } 2619 return method_ordering; 2620 } 2621 2622 // Parse generic_signature attribute for methods and fields 2623 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { 2624 ClassFileStream* cfs = stream(); 2625 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2626 u2 generic_signature_index = cfs->get_u2_fast(); 2627 check_property( 2628 valid_symbol_at(generic_signature_index), 2629 "Invalid Signature attribute at constant pool index %u in class file %s", 2630 generic_signature_index, CHECK_0); 2631 return generic_signature_index; 2632 } 2633 2634 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2635 ClassFileStream* cfs = stream(); 2636 cfs->guarantee_more(2, CHECK); // sourcefile_index 2637 u2 sourcefile_index = cfs->get_u2_fast(); 2638 check_property( 2639 valid_symbol_at(sourcefile_index), 2640 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2641 sourcefile_index, CHECK); 2642 set_class_sourcefile_index(sourcefile_index); 2643 } 2644 2645 2646 2647 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2648 ClassFileStream* cfs = stream(); 2649 u1* sde_buffer = cfs->get_u1_buffer(); 2650 assert(sde_buffer != NULL, "null sde buffer"); 2651 2652 // Don't bother storing it if there is no way to retrieve it 2653 if (JvmtiExport::can_get_source_debug_extension()) { 2654 assert((length+1) > length, "Overflow checking"); 2655 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2656 for (int i = 0; i < length; i++) { 2657 sde[i] = sde_buffer[i]; 2658 } 2659 sde[length] = '\0'; 2660 set_class_sde_buffer((char*)sde, length); 2661 } 2662 // Got utf8 string, set stream position forward 2663 cfs->skip_u1(length, CHECK); 2664 } 2665 2666 2667 // Inner classes can be static, private or protected (classic VM does this) 2668 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2669 2670 // Return number of classes in the inner classes attribute table 2671 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2672 bool parsed_enclosingmethod_attribute, 2673 u2 enclosing_method_class_index, 2674 u2 enclosing_method_method_index, 2675 TRAPS) { 2676 ClassFileStream* cfs = stream(); 2677 u1* current_mark = cfs->current(); 2678 u2 length = 0; 2679 if (inner_classes_attribute_start != NULL) { 2680 cfs->set_current(inner_classes_attribute_start); 2681 cfs->guarantee_more(2, CHECK_0); // length 2682 length = cfs->get_u2_fast(); 2683 } 2684 2685 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2686 // method data: 2687 // [inner_class_info_index, 2688 // outer_class_info_index, 2689 // inner_name_index, 2690 // inner_class_access_flags, 2691 // ... 2692 // enclosing_method_class_index, 2693 // enclosing_method_method_index] 2694 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2695 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2696 _inner_classes = inner_classes; 2697 2698 int index = 0; 2699 int cp_size = _cp->length(); 2700 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2701 for (int n = 0; n < length; n++) { 2702 // Inner class index 2703 u2 inner_class_info_index = cfs->get_u2_fast(); 2704 check_property( 2705 inner_class_info_index == 0 || 2706 valid_klass_reference_at(inner_class_info_index), 2707 "inner_class_info_index %u has bad constant type in class file %s", 2708 inner_class_info_index, CHECK_0); 2709 // Outer class index 2710 u2 outer_class_info_index = cfs->get_u2_fast(); 2711 check_property( 2712 outer_class_info_index == 0 || 2713 valid_klass_reference_at(outer_class_info_index), 2714 "outer_class_info_index %u has bad constant type in class file %s", 2715 outer_class_info_index, CHECK_0); 2716 // Inner class name 2717 u2 inner_name_index = cfs->get_u2_fast(); 2718 check_property( 2719 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2720 "inner_name_index %u has bad constant type in class file %s", 2721 inner_name_index, CHECK_0); 2722 if (_need_verify) { 2723 guarantee_property(inner_class_info_index != outer_class_info_index, 2724 "Class is both outer and inner class in class file %s", CHECK_0); 2725 } 2726 // Access flags 2727 AccessFlags inner_access_flags; 2728 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2729 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2730 // Set abstract bit for old class files for backward compatibility 2731 flags |= JVM_ACC_ABSTRACT; 2732 } 2733 verify_legal_class_modifiers(flags, CHECK_0); 2734 inner_access_flags.set_flags(flags); 2735 2736 inner_classes->at_put(index++, inner_class_info_index); 2737 inner_classes->at_put(index++, outer_class_info_index); 2738 inner_classes->at_put(index++, inner_name_index); 2739 inner_classes->at_put(index++, inner_access_flags.as_short()); 2740 } 2741 2742 // 4347400: make sure there's no duplicate entry in the classes array 2743 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2744 for(int i = 0; i < length * 4; i += 4) { 2745 for(int j = i + 4; j < length * 4; j += 4) { 2746 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2747 inner_classes->at(i+1) != inner_classes->at(j+1) || 2748 inner_classes->at(i+2) != inner_classes->at(j+2) || 2749 inner_classes->at(i+3) != inner_classes->at(j+3)), 2750 "Duplicate entry in InnerClasses in class file %s", 2751 CHECK_0); 2752 } 2753 } 2754 } 2755 2756 // Set EnclosingMethod class and method indexes. 2757 if (parsed_enclosingmethod_attribute) { 2758 inner_classes->at_put(index++, enclosing_method_class_index); 2759 inner_classes->at_put(index++, enclosing_method_method_index); 2760 } 2761 assert(index == size, "wrong size"); 2762 2763 // Restore buffer's current position. 2764 cfs->set_current(current_mark); 2765 2766 return length; 2767 } 2768 2769 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2770 set_class_synthetic_flag(true); 2771 } 2772 2773 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2774 ClassFileStream* cfs = stream(); 2775 u2 signature_index = cfs->get_u2(CHECK); 2776 check_property( 2777 valid_symbol_at(signature_index), 2778 "Invalid constant pool index %u in Signature attribute in class file %s", 2779 signature_index, CHECK); 2780 set_class_generic_signature_index(signature_index); 2781 } 2782 2783 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2784 ClassFileStream* cfs = stream(); 2785 u1* current_start = cfs->current(); 2786 2787 guarantee_property(attribute_byte_length >= sizeof(u2), 2788 "Invalid BootstrapMethods attribute length %u in class file %s", 2789 attribute_byte_length, 2790 CHECK); 2791 2792 cfs->guarantee_more(attribute_byte_length, CHECK); 2793 2794 int attribute_array_length = cfs->get_u2_fast(); 2795 2796 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2797 "Short length on BootstrapMethods in class file %s", 2798 CHECK); 2799 2800 // The attribute contains a counted array of counted tuples of shorts, 2801 // represending bootstrap specifiers: 2802 // length*{bootstrap_method_index, argument_count*{argument_index}} 2803 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2804 // operand_count = number of shorts in attr, except for leading length 2805 2806 // The attribute is copied into a short[] array. 2807 // The array begins with a series of short[2] pairs, one for each tuple. 2808 int index_size = (attribute_array_length * 2); 2809 2810 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2811 2812 // Eagerly assign operands so they will be deallocated with the constant 2813 // pool if there is an error. 2814 _cp->set_operands(operands); 2815 2816 int operand_fill_index = index_size; 2817 int cp_size = _cp->length(); 2818 2819 for (int n = 0; n < attribute_array_length; n++) { 2820 // Store a 32-bit offset into the header of the operand array. 2821 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2822 2823 // Read a bootstrap specifier. 2824 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2825 u2 bootstrap_method_index = cfs->get_u2_fast(); 2826 u2 argument_count = cfs->get_u2_fast(); 2827 check_property( 2828 valid_cp_range(bootstrap_method_index, cp_size) && 2829 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2830 "bootstrap_method_index %u has bad constant type in class file %s", 2831 bootstrap_method_index, 2832 CHECK); 2833 operands->at_put(operand_fill_index++, bootstrap_method_index); 2834 operands->at_put(operand_fill_index++, argument_count); 2835 2836 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2837 for (int j = 0; j < argument_count; j++) { 2838 u2 argument_index = cfs->get_u2_fast(); 2839 check_property( 2840 valid_cp_range(argument_index, cp_size) && 2841 _cp->tag_at(argument_index).is_loadable_constant(), 2842 "argument_index %u has bad constant type in class file %s", 2843 argument_index, 2844 CHECK); 2845 operands->at_put(operand_fill_index++, argument_index); 2846 } 2847 } 2848 2849 assert(operand_fill_index == operands->length(), "exact fill"); 2850 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode"); 2851 2852 u1* current_end = cfs->current(); 2853 guarantee_property(current_end == current_start + attribute_byte_length, 2854 "Bad length on BootstrapMethods in class file %s", 2855 CHECK); 2856 } 2857 2858 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2859 TRAPS) { 2860 ClassFileStream* cfs = stream(); 2861 // Set inner classes attribute to default sentinel 2862 _inner_classes = Universe::the_empty_short_array(); 2863 cfs->guarantee_more(2, CHECK); // attributes_count 2864 u2 attributes_count = cfs->get_u2_fast(); 2865 bool parsed_sourcefile_attribute = false; 2866 bool parsed_innerclasses_attribute = false; 2867 bool parsed_enclosingmethod_attribute = false; 2868 bool parsed_bootstrap_methods_attribute = false; 2869 u1* runtime_visible_annotations = NULL; 2870 int runtime_visible_annotations_length = 0; 2871 u1* runtime_invisible_annotations = NULL; 2872 int runtime_invisible_annotations_length = 0; 2873 u1* runtime_visible_type_annotations = NULL; 2874 int runtime_visible_type_annotations_length = 0; 2875 u1* runtime_invisible_type_annotations = NULL; 2876 int runtime_invisible_type_annotations_length = 0; 2877 bool runtime_invisible_type_annotations_exists = false; 2878 u1* inner_classes_attribute_start = NULL; 2879 u4 inner_classes_attribute_length = 0; 2880 u2 enclosing_method_class_index = 0; 2881 u2 enclosing_method_method_index = 0; 2882 // Iterate over attributes 2883 while (attributes_count--) { 2884 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2885 u2 attribute_name_index = cfs->get_u2_fast(); 2886 u4 attribute_length = cfs->get_u4_fast(); 2887 check_property( 2888 valid_symbol_at(attribute_name_index), 2889 "Attribute name has bad constant pool index %u in class file %s", 2890 attribute_name_index, CHECK); 2891 Symbol* tag = _cp->symbol_at(attribute_name_index); 2892 if (tag == vmSymbols::tag_source_file()) { 2893 // Check for SourceFile tag 2894 if (_need_verify) { 2895 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2896 } 2897 if (parsed_sourcefile_attribute) { 2898 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2899 } else { 2900 parsed_sourcefile_attribute = true; 2901 } 2902 parse_classfile_sourcefile_attribute(CHECK); 2903 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2904 // Check for SourceDebugExtension tag 2905 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2906 } else if (tag == vmSymbols::tag_inner_classes()) { 2907 // Check for InnerClasses tag 2908 if (parsed_innerclasses_attribute) { 2909 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2910 } else { 2911 parsed_innerclasses_attribute = true; 2912 } 2913 inner_classes_attribute_start = cfs->get_u1_buffer(); 2914 inner_classes_attribute_length = attribute_length; 2915 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2916 } else if (tag == vmSymbols::tag_synthetic()) { 2917 // Check for Synthetic tag 2918 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2919 if (attribute_length != 0) { 2920 classfile_parse_error( 2921 "Invalid Synthetic classfile attribute length %u in class file %s", 2922 attribute_length, CHECK); 2923 } 2924 parse_classfile_synthetic_attribute(CHECK); 2925 } else if (tag == vmSymbols::tag_deprecated()) { 2926 // Check for Deprecatd tag - 4276120 2927 if (attribute_length != 0) { 2928 classfile_parse_error( 2929 "Invalid Deprecated classfile attribute length %u in class file %s", 2930 attribute_length, CHECK); 2931 } 2932 } else if (_major_version >= JAVA_1_5_VERSION) { 2933 if (tag == vmSymbols::tag_signature()) { 2934 if (attribute_length != 2) { 2935 classfile_parse_error( 2936 "Wrong Signature attribute length %u in class file %s", 2937 attribute_length, CHECK); 2938 } 2939 parse_classfile_signature_attribute(CHECK); 2940 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2941 runtime_visible_annotations_length = attribute_length; 2942 runtime_visible_annotations = cfs->get_u1_buffer(); 2943 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2944 parse_annotations(runtime_visible_annotations, 2945 runtime_visible_annotations_length, 2946 parsed_annotations, 2947 CHECK); 2948 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2949 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2950 runtime_invisible_annotations_length = attribute_length; 2951 runtime_invisible_annotations = cfs->get_u1_buffer(); 2952 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2953 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2954 } else if (tag == vmSymbols::tag_enclosing_method()) { 2955 if (parsed_enclosingmethod_attribute) { 2956 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2957 } else { 2958 parsed_enclosingmethod_attribute = true; 2959 } 2960 cfs->guarantee_more(4, CHECK); // class_index, method_index 2961 enclosing_method_class_index = cfs->get_u2_fast(); 2962 enclosing_method_method_index = cfs->get_u2_fast(); 2963 if (enclosing_method_class_index == 0) { 2964 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2965 } 2966 // Validate the constant pool indices and types 2967 check_property(valid_klass_reference_at(enclosing_method_class_index), 2968 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2969 if (enclosing_method_method_index != 0 && 2970 (!_cp->is_within_bounds(enclosing_method_method_index) || 2971 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 2972 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2973 } 2974 } else if (tag == vmSymbols::tag_bootstrap_methods() && 2975 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 2976 if (parsed_bootstrap_methods_attribute) 2977 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 2978 parsed_bootstrap_methods_attribute = true; 2979 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 2980 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 2981 if (runtime_visible_type_annotations != NULL) { 2982 classfile_parse_error( 2983 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 2984 } 2985 runtime_visible_type_annotations_length = attribute_length; 2986 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2987 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2988 // No need for the VM to parse Type annotations 2989 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 2990 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 2991 if (runtime_invisible_type_annotations_exists) { 2992 classfile_parse_error( 2993 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 2994 } else { 2995 runtime_invisible_type_annotations_exists = true; 2996 } 2997 if (PreserveAllAnnotations) { 2998 runtime_invisible_type_annotations_length = attribute_length; 2999 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3000 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3001 } 3002 cfs->skip_u1(attribute_length, CHECK); 3003 } else { 3004 // Unknown attribute 3005 cfs->skip_u1(attribute_length, CHECK); 3006 } 3007 } else { 3008 // Unknown attribute 3009 cfs->skip_u1(attribute_length, CHECK); 3010 } 3011 } 3012 _annotations = assemble_annotations(runtime_visible_annotations, 3013 runtime_visible_annotations_length, 3014 runtime_invisible_annotations, 3015 runtime_invisible_annotations_length, 3016 CHECK); 3017 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3018 runtime_visible_type_annotations_length, 3019 runtime_invisible_type_annotations, 3020 runtime_invisible_type_annotations_length, 3021 CHECK); 3022 3023 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3024 u2 num_of_classes = parse_classfile_inner_classes_attribute( 3025 inner_classes_attribute_start, 3026 parsed_innerclasses_attribute, 3027 enclosing_method_class_index, 3028 enclosing_method_method_index, 3029 CHECK); 3030 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3031 guarantee_property( 3032 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3033 "Wrong InnerClasses attribute length in class file %s", CHECK); 3034 } 3035 } 3036 3037 if (_max_bootstrap_specifier_index >= 0) { 3038 guarantee_property(parsed_bootstrap_methods_attribute, 3039 "Missing BootstrapMethods attribute in class file %s", CHECK); 3040 } 3041 } 3042 3043 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 3044 if (_synthetic_flag) 3045 k->set_is_synthetic(); 3046 if (_sourcefile_index != 0) { 3047 k->set_source_file_name_index(_sourcefile_index); 3048 } 3049 if (_generic_signature_index != 0) { 3050 k->set_generic_signature_index(_generic_signature_index); 3051 } 3052 if (_sde_buffer != NULL) { 3053 k->set_source_debug_extension(_sde_buffer, _sde_length); 3054 } 3055 } 3056 3057 // Transfer ownership of metadata allocated to the InstanceKlass. 3058 void ClassFileParser::apply_parsed_class_metadata( 3059 instanceKlassHandle this_klass, 3060 int java_fields_count, TRAPS) { 3061 // Assign annotations if needed 3062 if (_annotations != NULL || _type_annotations != NULL || 3063 _fields_annotations != NULL || _fields_type_annotations != NULL) { 3064 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3065 annotations->set_class_annotations(_annotations); 3066 annotations->set_class_type_annotations(_type_annotations); 3067 annotations->set_fields_annotations(_fields_annotations); 3068 annotations->set_fields_type_annotations(_fields_type_annotations); 3069 this_klass->set_annotations(annotations); 3070 } 3071 3072 _cp->set_pool_holder(this_klass()); 3073 this_klass->set_constants(_cp); 3074 this_klass->set_fields(_fields, java_fields_count); 3075 this_klass->set_methods(_methods); 3076 this_klass->set_inner_classes(_inner_classes); 3077 this_klass->set_local_interfaces(_local_interfaces); 3078 this_klass->set_transitive_interfaces(_transitive_interfaces); 3079 3080 // Clear out these fields so they don't get deallocated by the destructor 3081 clear_class_metadata(); 3082 } 3083 3084 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3085 int runtime_visible_annotations_length, 3086 u1* runtime_invisible_annotations, 3087 int runtime_invisible_annotations_length, TRAPS) { 3088 AnnotationArray* annotations = NULL; 3089 if (runtime_visible_annotations != NULL || 3090 runtime_invisible_annotations != NULL) { 3091 annotations = MetadataFactory::new_array<u1>(_loader_data, 3092 runtime_visible_annotations_length + 3093 runtime_invisible_annotations_length, 3094 CHECK_(annotations)); 3095 if (runtime_visible_annotations != NULL) { 3096 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3097 annotations->at_put(i, runtime_visible_annotations[i]); 3098 } 3099 } 3100 if (runtime_invisible_annotations != NULL) { 3101 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3102 int append = runtime_visible_annotations_length+i; 3103 annotations->at_put(append, runtime_invisible_annotations[i]); 3104 } 3105 } 3106 } 3107 return annotations; 3108 } 3109 3110 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3111 TRAPS) { 3112 instanceKlassHandle super_klass; 3113 if (super_class_index == 0) { 3114 check_property(_class_name == vmSymbols::java_lang_Object(), 3115 "Invalid superclass index %u in class file %s", 3116 super_class_index, 3117 CHECK_NULL); 3118 } else { 3119 check_property(valid_klass_reference_at(super_class_index), 3120 "Invalid superclass index %u in class file %s", 3121 super_class_index, 3122 CHECK_NULL); 3123 // The class name should be legal because it is checked when parsing constant pool. 3124 // However, make sure it is not an array type. 3125 bool is_array = false; 3126 if (_cp->tag_at(super_class_index).is_klass()) { 3127 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3128 if (_need_verify) 3129 is_array = super_klass->oop_is_array(); 3130 } else if (_need_verify) { 3131 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3132 } 3133 if (_need_verify) { 3134 guarantee_property(!is_array, 3135 "Bad superclass name in class file %s", CHECK_NULL); 3136 } 3137 } 3138 return super_klass; 3139 } 3140 3141 3142 // Values needed for oopmap and InstanceKlass creation 3143 class FieldLayoutInfo : public StackObj { 3144 public: 3145 int* nonstatic_oop_offsets; 3146 unsigned int* nonstatic_oop_counts; 3147 unsigned int nonstatic_oop_map_count; 3148 unsigned int total_oop_map_count; 3149 int instance_size; 3150 int nonstatic_field_size; 3151 int static_field_size; 3152 bool has_nonstatic_fields; 3153 }; 3154 3155 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3156 void ClassFileParser::layout_fields(Handle class_loader, 3157 FieldAllocationCount* fac, 3158 ClassAnnotationCollector* parsed_annotations, 3159 FieldLayoutInfo* info, 3160 TRAPS) { 3161 3162 // Field size and offset computation 3163 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3164 int next_static_oop_offset; 3165 int next_static_double_offset; 3166 int next_static_word_offset; 3167 int next_static_short_offset; 3168 int next_static_byte_offset; 3169 int next_nonstatic_oop_offset; 3170 int next_nonstatic_double_offset; 3171 int next_nonstatic_word_offset; 3172 int next_nonstatic_short_offset; 3173 int next_nonstatic_byte_offset; 3174 int first_nonstatic_oop_offset; 3175 int next_nonstatic_field_offset; 3176 int next_nonstatic_padded_offset; 3177 3178 // Count the contended fields by type. 3179 // 3180 // We ignore static fields, because @Contended is not supported for them. 3181 // The layout code below will also ignore the static fields. 3182 int nonstatic_contended_count = 0; 3183 FieldAllocationCount fac_contended; 3184 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3185 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3186 if (fs.is_contended()) { 3187 fac_contended.count[atype]++; 3188 if (!fs.access_flags().is_static()) { 3189 nonstatic_contended_count++; 3190 } 3191 } 3192 } 3193 3194 3195 // Calculate the starting byte offsets 3196 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3197 next_static_double_offset = next_static_oop_offset + 3198 ((fac->count[STATIC_OOP]) * heapOopSize); 3199 if ( fac->count[STATIC_DOUBLE] && 3200 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3201 Universe::field_type_should_be_aligned(T_LONG)) ) { 3202 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3203 } 3204 3205 next_static_word_offset = next_static_double_offset + 3206 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3207 next_static_short_offset = next_static_word_offset + 3208 ((fac->count[STATIC_WORD]) * BytesPerInt); 3209 next_static_byte_offset = next_static_short_offset + 3210 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3211 3212 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3213 nonstatic_field_size * heapOopSize; 3214 3215 next_nonstatic_field_offset = nonstatic_fields_start; 3216 3217 bool is_contended_class = parsed_annotations->is_contended(); 3218 3219 // Class is contended, pad before all the fields 3220 if (is_contended_class) { 3221 next_nonstatic_field_offset += ContendedPaddingWidth; 3222 } 3223 3224 // Compute the non-contended fields count. 3225 // The packing code below relies on these counts to determine if some field 3226 // can be squeezed into the alignment gap. Contended fields are obviously 3227 // exempt from that. 3228 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3229 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3230 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3231 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3232 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3233 3234 // Total non-static fields count, including every contended field 3235 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3236 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3237 fac->count[NONSTATIC_OOP]; 3238 3239 bool super_has_nonstatic_fields = 3240 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3241 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3242 3243 3244 // Prepare list of oops for oop map generation. 3245 // 3246 // "offset" and "count" lists are describing the set of contiguous oop 3247 // regions. offset[i] is the start of the i-th region, which then has 3248 // count[i] oops following. Before we know how many regions are required, 3249 // we pessimistically allocate the maps to fit all the oops into the 3250 // distinct regions. 3251 // 3252 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3253 // to figure out if we still need to do this. 3254 int* nonstatic_oop_offsets; 3255 unsigned int* nonstatic_oop_counts; 3256 unsigned int nonstatic_oop_map_count = 0; 3257 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3258 3259 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3260 THREAD, int, max_nonstatic_oop_maps); 3261 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3262 THREAD, unsigned int, max_nonstatic_oop_maps); 3263 3264 first_nonstatic_oop_offset = 0; // will be set for first oop field 3265 3266 bool compact_fields = CompactFields; 3267 int allocation_style = FieldsAllocationStyle; 3268 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3269 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3270 allocation_style = 1; // Optimistic 3271 } 3272 3273 // The next classes have predefined hard-coded fields offsets 3274 // (see in JavaClasses::compute_hard_coded_offsets()). 3275 // Use default fields allocation order for them. 3276 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3277 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3278 _class_name == vmSymbols::java_lang_Class() || 3279 _class_name == vmSymbols::java_lang_ClassLoader() || 3280 _class_name == vmSymbols::java_lang_ref_Reference() || 3281 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3282 _class_name == vmSymbols::java_lang_StackTraceElement() || 3283 _class_name == vmSymbols::java_lang_String() || 3284 _class_name == vmSymbols::java_lang_Throwable() || 3285 _class_name == vmSymbols::java_lang_Boolean() || 3286 _class_name == vmSymbols::java_lang_Character() || 3287 _class_name == vmSymbols::java_lang_Float() || 3288 _class_name == vmSymbols::java_lang_Double() || 3289 _class_name == vmSymbols::java_lang_Byte() || 3290 _class_name == vmSymbols::java_lang_Short() || 3291 _class_name == vmSymbols::java_lang_Integer() || 3292 _class_name == vmSymbols::java_lang_Long())) { 3293 allocation_style = 0; // Allocate oops first 3294 compact_fields = false; // Don't compact fields 3295 } 3296 3297 // Rearrange fields for a given allocation style 3298 if( allocation_style == 0 ) { 3299 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3300 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3301 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3302 (nonstatic_oop_count * heapOopSize); 3303 } else if( allocation_style == 1 ) { 3304 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3305 next_nonstatic_double_offset = next_nonstatic_field_offset; 3306 } else if( allocation_style == 2 ) { 3307 // Fields allocation: oops fields in super and sub classes are together. 3308 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3309 _super_klass->nonstatic_oop_map_size() > 0 ) { 3310 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3311 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3312 OopMapBlock* last_map = first_map + map_count - 1; 3313 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3314 if (next_offset == next_nonstatic_field_offset) { 3315 allocation_style = 0; // allocate oops first 3316 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3317 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3318 (nonstatic_oop_count * heapOopSize); 3319 } 3320 } 3321 if( allocation_style == 2 ) { 3322 allocation_style = 1; // allocate oops last 3323 next_nonstatic_double_offset = next_nonstatic_field_offset; 3324 } 3325 } else { 3326 ShouldNotReachHere(); 3327 } 3328 3329 int nonstatic_oop_space_count = 0; 3330 int nonstatic_word_space_count = 0; 3331 int nonstatic_short_space_count = 0; 3332 int nonstatic_byte_space_count = 0; 3333 int nonstatic_oop_space_offset; 3334 int nonstatic_word_space_offset; 3335 int nonstatic_short_space_offset; 3336 int nonstatic_byte_space_offset; 3337 3338 // Try to squeeze some of the fields into the gaps due to 3339 // long/double alignment. 3340 if( nonstatic_double_count > 0 ) { 3341 int offset = next_nonstatic_double_offset; 3342 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3343 if( compact_fields && offset != next_nonstatic_double_offset ) { 3344 // Allocate available fields into the gap before double field. 3345 int length = next_nonstatic_double_offset - offset; 3346 assert(length == BytesPerInt, ""); 3347 nonstatic_word_space_offset = offset; 3348 if( nonstatic_word_count > 0 ) { 3349 nonstatic_word_count -= 1; 3350 nonstatic_word_space_count = 1; // Only one will fit 3351 length -= BytesPerInt; 3352 offset += BytesPerInt; 3353 } 3354 nonstatic_short_space_offset = offset; 3355 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3356 nonstatic_short_count -= 1; 3357 nonstatic_short_space_count += 1; 3358 length -= BytesPerShort; 3359 offset += BytesPerShort; 3360 } 3361 nonstatic_byte_space_offset = offset; 3362 while( length > 0 && nonstatic_byte_count > 0 ) { 3363 nonstatic_byte_count -= 1; 3364 nonstatic_byte_space_count += 1; 3365 length -= 1; 3366 } 3367 // Allocate oop field in the gap if there are no other fields for that. 3368 nonstatic_oop_space_offset = offset; 3369 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3370 allocation_style != 0 ) { // when oop fields not first 3371 nonstatic_oop_count -= 1; 3372 nonstatic_oop_space_count = 1; // Only one will fit 3373 length -= heapOopSize; 3374 offset += heapOopSize; 3375 } 3376 } 3377 } 3378 3379 next_nonstatic_word_offset = next_nonstatic_double_offset + 3380 (nonstatic_double_count * BytesPerLong); 3381 next_nonstatic_short_offset = next_nonstatic_word_offset + 3382 (nonstatic_word_count * BytesPerInt); 3383 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3384 (nonstatic_short_count * BytesPerShort); 3385 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3386 nonstatic_byte_count; 3387 3388 // let oops jump before padding with this allocation style 3389 if( allocation_style == 1 ) { 3390 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3391 if( nonstatic_oop_count > 0 ) { 3392 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3393 } 3394 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3395 } 3396 3397 // Iterate over fields again and compute correct offsets. 3398 // The field allocation type was temporarily stored in the offset slot. 3399 // oop fields are located before non-oop fields (static and non-static). 3400 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3401 3402 // skip already laid out fields 3403 if (fs.is_offset_set()) continue; 3404 3405 // contended instance fields are handled below 3406 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3407 3408 int real_offset; 3409 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3410 3411 // pack the rest of the fields 3412 switch (atype) { 3413 case STATIC_OOP: 3414 real_offset = next_static_oop_offset; 3415 next_static_oop_offset += heapOopSize; 3416 break; 3417 case STATIC_BYTE: 3418 real_offset = next_static_byte_offset; 3419 next_static_byte_offset += 1; 3420 break; 3421 case STATIC_SHORT: 3422 real_offset = next_static_short_offset; 3423 next_static_short_offset += BytesPerShort; 3424 break; 3425 case STATIC_WORD: 3426 real_offset = next_static_word_offset; 3427 next_static_word_offset += BytesPerInt; 3428 break; 3429 case STATIC_DOUBLE: 3430 real_offset = next_static_double_offset; 3431 next_static_double_offset += BytesPerLong; 3432 break; 3433 case NONSTATIC_OOP: 3434 if( nonstatic_oop_space_count > 0 ) { 3435 real_offset = nonstatic_oop_space_offset; 3436 nonstatic_oop_space_offset += heapOopSize; 3437 nonstatic_oop_space_count -= 1; 3438 } else { 3439 real_offset = next_nonstatic_oop_offset; 3440 next_nonstatic_oop_offset += heapOopSize; 3441 } 3442 // Update oop maps 3443 if( nonstatic_oop_map_count > 0 && 3444 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3445 real_offset - 3446 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3447 heapOopSize ) { 3448 // Extend current oop map 3449 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3450 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3451 } else { 3452 // Create new oop map 3453 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3454 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3455 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3456 nonstatic_oop_map_count += 1; 3457 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3458 first_nonstatic_oop_offset = real_offset; 3459 } 3460 } 3461 break; 3462 case NONSTATIC_BYTE: 3463 if( nonstatic_byte_space_count > 0 ) { 3464 real_offset = nonstatic_byte_space_offset; 3465 nonstatic_byte_space_offset += 1; 3466 nonstatic_byte_space_count -= 1; 3467 } else { 3468 real_offset = next_nonstatic_byte_offset; 3469 next_nonstatic_byte_offset += 1; 3470 } 3471 break; 3472 case NONSTATIC_SHORT: 3473 if( nonstatic_short_space_count > 0 ) { 3474 real_offset = nonstatic_short_space_offset; 3475 nonstatic_short_space_offset += BytesPerShort; 3476 nonstatic_short_space_count -= 1; 3477 } else { 3478 real_offset = next_nonstatic_short_offset; 3479 next_nonstatic_short_offset += BytesPerShort; 3480 } 3481 break; 3482 case NONSTATIC_WORD: 3483 if( nonstatic_word_space_count > 0 ) { 3484 real_offset = nonstatic_word_space_offset; 3485 nonstatic_word_space_offset += BytesPerInt; 3486 nonstatic_word_space_count -= 1; 3487 } else { 3488 real_offset = next_nonstatic_word_offset; 3489 next_nonstatic_word_offset += BytesPerInt; 3490 } 3491 break; 3492 case NONSTATIC_DOUBLE: 3493 real_offset = next_nonstatic_double_offset; 3494 next_nonstatic_double_offset += BytesPerLong; 3495 break; 3496 default: 3497 ShouldNotReachHere(); 3498 } 3499 fs.set_offset(real_offset); 3500 } 3501 3502 3503 // Handle the contended cases. 3504 // 3505 // Each contended field should not intersect the cache line with another contended field. 3506 // In the absence of alignment information, we end up with pessimistically separating 3507 // the fields with full-width padding. 3508 // 3509 // Additionally, this should not break alignment for the fields, so we round the alignment up 3510 // for each field. 3511 if (nonstatic_contended_count > 0) { 3512 3513 // if there is at least one contended field, we need to have pre-padding for them 3514 next_nonstatic_padded_offset += ContendedPaddingWidth; 3515 3516 // collect all contended groups 3517 BitMap bm(_cp->size()); 3518 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3519 // skip already laid out fields 3520 if (fs.is_offset_set()) continue; 3521 3522 if (fs.is_contended()) { 3523 bm.set_bit(fs.contended_group()); 3524 } 3525 } 3526 3527 int current_group = -1; 3528 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3529 3530 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3531 3532 // skip already laid out fields 3533 if (fs.is_offset_set()) continue; 3534 3535 // skip non-contended fields and fields from different group 3536 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3537 3538 // handle statics below 3539 if (fs.access_flags().is_static()) continue; 3540 3541 int real_offset; 3542 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3543 3544 switch (atype) { 3545 case NONSTATIC_BYTE: 3546 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3547 real_offset = next_nonstatic_padded_offset; 3548 next_nonstatic_padded_offset += 1; 3549 break; 3550 3551 case NONSTATIC_SHORT: 3552 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3553 real_offset = next_nonstatic_padded_offset; 3554 next_nonstatic_padded_offset += BytesPerShort; 3555 break; 3556 3557 case NONSTATIC_WORD: 3558 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3559 real_offset = next_nonstatic_padded_offset; 3560 next_nonstatic_padded_offset += BytesPerInt; 3561 break; 3562 3563 case NONSTATIC_DOUBLE: 3564 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3565 real_offset = next_nonstatic_padded_offset; 3566 next_nonstatic_padded_offset += BytesPerLong; 3567 break; 3568 3569 case NONSTATIC_OOP: 3570 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3571 real_offset = next_nonstatic_padded_offset; 3572 next_nonstatic_padded_offset += heapOopSize; 3573 3574 // Create new oop map 3575 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3576 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3577 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3578 nonstatic_oop_map_count += 1; 3579 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3580 first_nonstatic_oop_offset = real_offset; 3581 } 3582 break; 3583 3584 default: 3585 ShouldNotReachHere(); 3586 } 3587 3588 if (fs.contended_group() == 0) { 3589 // Contended group defines the equivalence class over the fields: 3590 // the fields within the same contended group are not inter-padded. 3591 // The only exception is default group, which does not incur the 3592 // equivalence, and so requires intra-padding. 3593 next_nonstatic_padded_offset += ContendedPaddingWidth; 3594 } 3595 3596 fs.set_offset(real_offset); 3597 } // for 3598 3599 // Start laying out the next group. 3600 // Note that this will effectively pad the last group in the back; 3601 // this is expected to alleviate memory contention effects for 3602 // subclass fields and/or adjacent object. 3603 // If this was the default group, the padding is already in place. 3604 if (current_group != 0) { 3605 next_nonstatic_padded_offset += ContendedPaddingWidth; 3606 } 3607 } 3608 3609 // handle static fields 3610 } 3611 3612 // Entire class is contended, pad in the back. 3613 // This helps to alleviate memory contention effects for subclass fields 3614 // and/or adjacent object. 3615 if (is_contended_class) { 3616 next_nonstatic_padded_offset += ContendedPaddingWidth; 3617 } 3618 3619 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3620 3621 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3622 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3623 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3624 3625 int static_field_size = (static_fields_end - 3626 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3627 nonstatic_field_size = nonstatic_field_size + 3628 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3629 3630 int instance_size = align_object_size(instance_end / wordSize); 3631 3632 assert(instance_size == align_object_size(align_size_up( 3633 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3634 wordSize) / wordSize), "consistent layout helper value"); 3635 3636 // Invariant: nonstatic_field end/start should only change if there are 3637 // nonstatic fields in the class, or if the class is contended. We compare 3638 // against the non-aligned value, so that end alignment will not fail the 3639 // assert without actually having the fields. 3640 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3641 is_contended_class || 3642 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3643 3644 // Number of non-static oop map blocks allocated at end of klass. 3645 const unsigned int total_oop_map_count = 3646 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3647 first_nonstatic_oop_offset); 3648 3649 #ifndef PRODUCT 3650 if (PrintFieldLayout) { 3651 print_field_layout(_class_name, 3652 _fields, 3653 _cp, 3654 instance_size, 3655 nonstatic_fields_start, 3656 nonstatic_fields_end, 3657 static_fields_end); 3658 } 3659 3660 #endif 3661 // Pass back information needed for InstanceKlass creation 3662 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3663 info->nonstatic_oop_counts = nonstatic_oop_counts; 3664 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3665 info->total_oop_map_count = total_oop_map_count; 3666 info->instance_size = instance_size; 3667 info->static_field_size = static_field_size; 3668 info->nonstatic_field_size = nonstatic_field_size; 3669 info->has_nonstatic_fields = has_nonstatic_fields; 3670 } 3671 3672 3673 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3674 ClassLoaderData* loader_data, 3675 Handle protection_domain, 3676 KlassHandle host_klass, 3677 GrowableArray<Handle>* cp_patches, 3678 TempNewSymbol& parsed_name, 3679 bool verify, 3680 TRAPS) { 3681 3682 // When a retransformable agent is attached, JVMTI caches the 3683 // class bytes that existed before the first retransformation. 3684 // If RedefineClasses() was used before the retransformable 3685 // agent attached, then the cached class bytes may not be the 3686 // original class bytes. 3687 JvmtiCachedClassFileData *cached_class_file = NULL; 3688 Handle class_loader(THREAD, loader_data->class_loader()); 3689 bool has_default_methods = false; 3690 ResourceMark rm(THREAD); 3691 3692 ClassFileStream* cfs = stream(); 3693 // Timing 3694 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3695 JavaThread* jt = (JavaThread*) THREAD; 3696 3697 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3698 ClassLoader::perf_class_parse_selftime(), 3699 NULL, 3700 jt->get_thread_stat()->perf_recursion_counts_addr(), 3701 jt->get_thread_stat()->perf_timers_addr(), 3702 PerfClassTraceTime::PARSE_CLASS); 3703 3704 init_parsed_class_attributes(loader_data); 3705 3706 if (JvmtiExport::should_post_class_file_load_hook()) { 3707 // Get the cached class file bytes (if any) from the class that 3708 // is being redefined or retransformed. We use jvmti_thread_state() 3709 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3710 // a JvmtiThreadState any earlier than necessary. This will help 3711 // avoid the bug described by 7126851. 3712 JvmtiThreadState *state = jt->jvmti_thread_state(); 3713 if (state != NULL) { 3714 KlassHandle *h_class_being_redefined = 3715 state->get_class_being_redefined(); 3716 if (h_class_being_redefined != NULL) { 3717 instanceKlassHandle ikh_class_being_redefined = 3718 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3719 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3720 } 3721 } 3722 3723 unsigned char* ptr = cfs->buffer(); 3724 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3725 3726 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3727 &ptr, &end_ptr, &cached_class_file); 3728 3729 if (ptr != cfs->buffer()) { 3730 // JVMTI agent has modified class file data. 3731 // Set new class file stream using JVMTI agent modified 3732 // class file data. 3733 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3734 set_stream(cfs); 3735 } 3736 } 3737 3738 _host_klass = host_klass; 3739 _cp_patches = cp_patches; 3740 3741 instanceKlassHandle nullHandle; 3742 3743 // Figure out whether we can skip format checking (matching classic VM behavior) 3744 if (DumpSharedSpaces) { 3745 // verify == true means it's a 'remote' class (i.e., non-boot class) 3746 // Verification decision is based on BytecodeVerificationRemote flag 3747 // for those classes. 3748 _need_verify = (verify) ? BytecodeVerificationRemote : 3749 BytecodeVerificationLocal; 3750 } else { 3751 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3752 } 3753 3754 // Set the verify flag in stream 3755 cfs->set_verify(_need_verify); 3756 3757 // Save the class file name for easier error message printing. 3758 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3759 3760 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3761 // Magic value 3762 u4 magic = cfs->get_u4_fast(); 3763 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3764 "Incompatible magic value %u in class file %s", 3765 magic, CHECK_(nullHandle)); 3766 3767 // Version numbers 3768 u2 minor_version = cfs->get_u2_fast(); 3769 u2 major_version = cfs->get_u2_fast(); 3770 3771 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { 3772 ResourceMark rm; 3773 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 3774 major_version, minor_version, name->as_C_string()); 3775 Exceptions::fthrow( 3776 THREAD_AND_LOCATION, 3777 vmSymbols::java_lang_UnsupportedClassVersionError(), 3778 "Unsupported major.minor version for dump time %u.%u", 3779 major_version, 3780 minor_version); 3781 } 3782 3783 // Check version numbers - we check this even with verifier off 3784 if (!is_supported_version(major_version, minor_version)) { 3785 if (name == NULL) { 3786 Exceptions::fthrow( 3787 THREAD_AND_LOCATION, 3788 vmSymbols::java_lang_UnsupportedClassVersionError(), 3789 "Unsupported class file version %u.%u, " 3790 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3791 major_version, 3792 minor_version, 3793 JAVA_MAX_SUPPORTED_VERSION, 3794 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3795 } else { 3796 ResourceMark rm(THREAD); 3797 Exceptions::fthrow( 3798 THREAD_AND_LOCATION, 3799 vmSymbols::java_lang_UnsupportedClassVersionError(), 3800 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 3801 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3802 name->as_C_string(), 3803 major_version, 3804 minor_version, 3805 JAVA_MAX_SUPPORTED_VERSION, 3806 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3807 } 3808 return nullHandle; 3809 } 3810 3811 _major_version = major_version; 3812 _minor_version = minor_version; 3813 3814 3815 // Check if verification needs to be relaxed for this class file 3816 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3817 _relax_verify = Verifier::relax_verify_for(class_loader()); 3818 3819 // Constant pool 3820 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3821 3822 int cp_size = cp->length(); 3823 3824 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3825 3826 // Access flags 3827 AccessFlags access_flags; 3828 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3829 3830 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3831 // Set abstract bit for old class files for backward compatibility 3832 flags |= JVM_ACC_ABSTRACT; 3833 } 3834 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3835 access_flags.set_flags(flags); 3836 3837 // This class and superclass 3838 u2 this_class_index = cfs->get_u2_fast(); 3839 check_property( 3840 valid_cp_range(this_class_index, cp_size) && 3841 cp->tag_at(this_class_index).is_unresolved_klass(), 3842 "Invalid this class index %u in constant pool in class file %s", 3843 this_class_index, CHECK_(nullHandle)); 3844 3845 Symbol* class_name = cp->unresolved_klass_at(this_class_index); 3846 assert(class_name != NULL, "class_name can't be null"); 3847 3848 // It's important to set parsed_name *before* resolving the super class. 3849 // (it's used for cleanup by the caller if parsing fails) 3850 parsed_name = class_name; 3851 // parsed_name is returned and can be used if there's an error, so add to 3852 // its reference count. Caller will decrement the refcount. 3853 parsed_name->increment_refcount(); 3854 3855 // Update _class_name which could be null previously to be class_name 3856 _class_name = class_name; 3857 3858 // Don't need to check whether this class name is legal or not. 3859 // It has been checked when constant pool is parsed. 3860 // However, make sure it is not an array type. 3861 if (_need_verify) { 3862 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3863 "Bad class name in class file %s", 3864 CHECK_(nullHandle)); 3865 } 3866 3867 Klass* preserve_this_klass; // for storing result across HandleMark 3868 3869 // release all handles when parsing is done 3870 { HandleMark hm(THREAD); 3871 3872 // Checks if name in class file matches requested name 3873 if (name != NULL && class_name != name) { 3874 ResourceMark rm(THREAD); 3875 Exceptions::fthrow( 3876 THREAD_AND_LOCATION, 3877 vmSymbols::java_lang_NoClassDefFoundError(), 3878 "%s (wrong name: %s)", 3879 name->as_C_string(), 3880 class_name->as_C_string() 3881 ); 3882 return nullHandle; 3883 } 3884 3885 if (TraceClassLoadingPreorder) { 3886 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3887 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3888 tty->print_cr("]"); 3889 } 3890 #if INCLUDE_CDS 3891 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { 3892 // Only dump the classes that can be stored into CDS archive 3893 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { 3894 if (name != NULL) { 3895 ResourceMark rm(THREAD); 3896 classlist_file->print_cr("%s", name->as_C_string()); 3897 classlist_file->flush(); 3898 } 3899 } 3900 } 3901 #endif 3902 3903 u2 super_class_index = cfs->get_u2_fast(); 3904 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3905 CHECK_NULL); 3906 3907 // Interfaces 3908 u2 itfs_len = cfs->get_u2_fast(); 3909 Array<Klass*>* local_interfaces = 3910 parse_interfaces(itfs_len, protection_domain, _class_name, 3911 &has_default_methods, CHECK_(nullHandle)); 3912 3913 u2 java_fields_count = 0; 3914 // Fields (offsets are filled in later) 3915 FieldAllocationCount fac; 3916 Array<u2>* fields = parse_fields(class_name, 3917 access_flags.is_interface(), 3918 &fac, &java_fields_count, 3919 CHECK_(nullHandle)); 3920 // Methods 3921 bool has_final_method = false; 3922 AccessFlags promoted_flags; 3923 promoted_flags.set_flags(0); 3924 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 3925 &promoted_flags, 3926 &has_final_method, 3927 &has_default_methods, 3928 CHECK_(nullHandle)); 3929 3930 // Additional attributes 3931 ClassAnnotationCollector parsed_annotations; 3932 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 3933 3934 // Make sure this is the end of class file stream 3935 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3936 3937 // We check super class after class file is parsed and format is checked 3938 if (super_class_index > 0 && super_klass.is_null()) { 3939 Symbol* sk = cp->klass_name_at(super_class_index); 3940 if (access_flags.is_interface()) { 3941 // Before attempting to resolve the superclass, check for class format 3942 // errors not checked yet. 3943 guarantee_property(sk == vmSymbols::java_lang_Object(), 3944 "Interfaces must have java.lang.Object as superclass in class file %s", 3945 CHECK_(nullHandle)); 3946 } 3947 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 3948 class_loader, 3949 protection_domain, 3950 true, 3951 CHECK_(nullHandle)); 3952 3953 KlassHandle kh (THREAD, k); 3954 super_klass = instanceKlassHandle(THREAD, kh()); 3955 } 3956 if (super_klass.not_null()) { 3957 3958 if (super_klass->has_default_methods()) { 3959 has_default_methods = true; 3960 } 3961 3962 if (super_klass->is_interface()) { 3963 ResourceMark rm(THREAD); 3964 Exceptions::fthrow( 3965 THREAD_AND_LOCATION, 3966 vmSymbols::java_lang_IncompatibleClassChangeError(), 3967 "class %s has interface %s as super class", 3968 class_name->as_klass_external_name(), 3969 super_klass->external_name() 3970 ); 3971 return nullHandle; 3972 } 3973 // Make sure super class is not final 3974 if (super_klass->is_final()) { 3975 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 3976 } 3977 } 3978 3979 // save super klass for error handling. 3980 _super_klass = super_klass; 3981 3982 // Compute the transitive list of all unique interfaces implemented by this class 3983 _transitive_interfaces = 3984 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 3985 3986 // sort methods 3987 intArray* method_ordering = sort_methods(methods); 3988 3989 // promote flags from parse_methods() to the klass' flags 3990 access_flags.add_promoted_flags(promoted_flags.as_int()); 3991 3992 // Size of Java vtable (in words) 3993 int vtable_size = 0; 3994 int itable_size = 0; 3995 int num_miranda_methods = 0; 3996 3997 GrowableArray<Method*> all_mirandas(20); 3998 3999 klassVtable::compute_vtable_size_and_num_mirandas( 4000 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 4001 access_flags, class_loader, class_name, local_interfaces, 4002 CHECK_(nullHandle)); 4003 4004 // Size of Java itable (in words) 4005 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 4006 4007 FieldLayoutInfo info; 4008 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 4009 4010 int total_oop_map_size2 = 4011 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 4012 4013 // Compute reference type 4014 ReferenceType rt; 4015 if (super_klass() == NULL) { 4016 rt = REF_NONE; 4017 } else { 4018 rt = super_klass->reference_type(); 4019 } 4020 4021 // We can now create the basic Klass* for this klass 4022 _klass = InstanceKlass::allocate_instance_klass(loader_data, 4023 vtable_size, 4024 itable_size, 4025 info.static_field_size, 4026 total_oop_map_size2, 4027 rt, 4028 access_flags, 4029 name, 4030 super_klass(), 4031 !host_klass.is_null(), 4032 CHECK_(nullHandle)); 4033 instanceKlassHandle this_klass (THREAD, _klass); 4034 4035 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 4036 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 4037 "sanity"); 4038 4039 // Fill in information already parsed 4040 this_klass->set_should_verify_class(verify); 4041 jint lh = Klass::instance_layout_helper(info.instance_size, false); 4042 this_klass->set_layout_helper(lh); 4043 assert(this_klass->oop_is_instance(), "layout is correct"); 4044 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 4045 // Not yet: supers are done below to support the new subtype-checking fields 4046 //this_klass->set_super(super_klass()); 4047 this_klass->set_class_loader_data(loader_data); 4048 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 4049 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 4050 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 4051 4052 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 4053 4054 if (has_final_method) { 4055 this_klass->set_has_final_method(); 4056 } 4057 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 4058 // The InstanceKlass::_methods_jmethod_ids cache 4059 // is managed on the assumption that the initial cache 4060 // size is equal to the number of methods in the class. If 4061 // that changes, then InstanceKlass::idnum_can_increment() 4062 // has to be changed accordingly. 4063 this_klass->set_initial_method_idnum(methods->length()); 4064 this_klass->set_name(cp->klass_name_at(this_class_index)); 4065 if (is_anonymous()) // I am well known to myself 4066 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 4067 4068 this_klass->set_minor_version(minor_version); 4069 this_klass->set_major_version(major_version); 4070 this_klass->set_has_default_methods(has_default_methods); 4071 4072 if (!host_klass.is_null()) { 4073 assert (this_klass->is_anonymous(), "should be the same"); 4074 this_klass->set_host_klass(host_klass()); 4075 } 4076 4077 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4078 // (We used to do this lazily, but now we query it in Rewriter, 4079 // which is eagerly done for every method, so we might as well do it now, 4080 // when everything is fresh in memory.) 4081 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { 4082 for (int j = 0; j < methods->length(); j++) { 4083 methods->at(j)->init_intrinsic_id(); 4084 } 4085 } 4086 4087 if (cached_class_file != NULL) { 4088 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4089 this_klass->set_cached_class_file(cached_class_file); 4090 } 4091 4092 // Fill in field values obtained by parse_classfile_attributes 4093 if (parsed_annotations.has_any_annotations()) 4094 parsed_annotations.apply_to(this_klass); 4095 apply_parsed_class_attributes(this_klass); 4096 4097 // Miranda methods 4098 if ((num_miranda_methods > 0) || 4099 // if this class introduced new miranda methods or 4100 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4101 // super class exists and this class inherited miranda methods 4102 ) { 4103 this_klass->set_has_miranda_methods(); // then set a flag 4104 } 4105 4106 // Fill in information needed to compute superclasses. 4107 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4108 4109 // Initialize itable offset tables 4110 klassItable::setup_itable_offset_table(this_klass); 4111 4112 // Compute transitive closure of interfaces this class implements 4113 // Do final class setup 4114 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4115 4116 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4117 set_precomputed_flags(this_klass); 4118 4119 // reinitialize modifiers, using the InnerClasses attribute 4120 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4121 this_klass->set_modifier_flags(computed_modifiers); 4122 4123 // check if this class can access its super class 4124 check_super_class_access(this_klass, CHECK_(nullHandle)); 4125 4126 // check if this class can access its superinterfaces 4127 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4128 4129 // check if this class overrides any final method 4130 check_final_method_override(this_klass, CHECK_(nullHandle)); 4131 4132 // check that if this class is an interface then it doesn't have static methods 4133 if (this_klass->is_interface()) { 4134 /* An interface in a JAVA 8 classfile can be static */ 4135 if (_major_version < JAVA_8_VERSION) { 4136 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4137 } 4138 } 4139 4140 // Allocate mirror and initialize static fields 4141 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, 4142 CHECK_(nullHandle)); 4143 4144 // Generate any default methods - default methods are interface methods 4145 // that have a default implementation. This is new with Lambda project. 4146 if (has_default_methods ) { 4147 DefaultMethods::generate_default_methods( 4148 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4149 } 4150 4151 // Update the loader_data graph. 4152 record_defined_class_dependencies(this_klass, CHECK_NULL); 4153 4154 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4155 false /* not shared class */); 4156 4157 if (TraceClassLoading) { 4158 ResourceMark rm; 4159 // print in a single call to reduce interleaving of output 4160 if (cfs->source() != NULL) { 4161 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4162 cfs->source()); 4163 } else if (class_loader.is_null()) { 4164 if (THREAD->is_Java_thread()) { 4165 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 4166 tty->print("[Loaded %s by instance of %s]\n", 4167 this_klass->external_name(), 4168 InstanceKlass::cast(caller)->external_name()); 4169 } else { 4170 tty->print("[Loaded %s]\n", this_klass->external_name()); 4171 } 4172 } else { 4173 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4174 InstanceKlass::cast(class_loader->klass())->external_name()); 4175 } 4176 } 4177 4178 if (TraceClassResolution) { 4179 ResourceMark rm; 4180 // print out the superclass. 4181 const char * from = this_klass()->external_name(); 4182 if (this_klass->java_super() != NULL) { 4183 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4184 } 4185 // print out each of the interface classes referred to by this class. 4186 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4187 if (local_interfaces != NULL) { 4188 int length = local_interfaces->length(); 4189 for (int i = 0; i < length; i++) { 4190 Klass* k = local_interfaces->at(i); 4191 InstanceKlass* to_class = InstanceKlass::cast(k); 4192 const char * to = to_class->external_name(); 4193 tty->print("RESOLVE %s %s (interface)\n", from, to); 4194 } 4195 } 4196 } 4197 4198 // preserve result across HandleMark 4199 preserve_this_klass = this_klass(); 4200 } 4201 4202 // Create new handle outside HandleMark (might be needed for 4203 // Extended Class Redefinition) 4204 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4205 debug_only(this_klass->verify();) 4206 4207 // Clear class if no error has occurred so destructor doesn't deallocate it 4208 _klass = NULL; 4209 return this_klass; 4210 } 4211 4212 // Destructor to clean up if there's an error 4213 ClassFileParser::~ClassFileParser() { 4214 MetadataFactory::free_metadata(_loader_data, _cp); 4215 MetadataFactory::free_array<u2>(_loader_data, _fields); 4216 4217 // Free methods 4218 InstanceKlass::deallocate_methods(_loader_data, _methods); 4219 4220 // beware of the Universe::empty_blah_array!! 4221 if (_inner_classes != Universe::the_empty_short_array()) { 4222 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4223 } 4224 4225 // Free interfaces 4226 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4227 _local_interfaces, _transitive_interfaces); 4228 4229 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4230 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4231 Annotations::free_contents(_loader_data, _fields_annotations); 4232 Annotations::free_contents(_loader_data, _fields_type_annotations); 4233 4234 clear_class_metadata(); 4235 4236 // deallocate the klass if already created. Don't directly deallocate, but add 4237 // to the deallocate list so that the klass is removed from the CLD::_klasses list 4238 // at a safepoint. 4239 if (_klass != NULL) { 4240 _loader_data->add_to_deallocate_list(_klass); 4241 } 4242 _klass = NULL; 4243 } 4244 4245 void ClassFileParser::print_field_layout(Symbol* name, 4246 Array<u2>* fields, 4247 constantPoolHandle cp, 4248 int instance_size, 4249 int instance_fields_start, 4250 int instance_fields_end, 4251 int static_fields_end) { 4252 tty->print("%s: field layout\n", name->as_klass_external_name()); 4253 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4254 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4255 if (!fs.access_flags().is_static()) { 4256 tty->print(" @%3d \"%s\" %s\n", 4257 fs.offset(), 4258 fs.name()->as_klass_external_name(), 4259 fs.signature()->as_klass_external_name()); 4260 } 4261 } 4262 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4263 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4264 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4265 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4266 if (fs.access_flags().is_static()) { 4267 tty->print(" @%3d \"%s\" %s\n", 4268 fs.offset(), 4269 fs.name()->as_klass_external_name(), 4270 fs.signature()->as_klass_external_name()); 4271 } 4272 } 4273 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4274 tty->print("\n"); 4275 } 4276 4277 unsigned int 4278 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4279 unsigned int nonstatic_oop_map_count, 4280 int first_nonstatic_oop_offset) { 4281 unsigned int map_count = 4282 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4283 if (nonstatic_oop_map_count > 0) { 4284 // We have oops to add to map 4285 if (map_count == 0) { 4286 map_count = nonstatic_oop_map_count; 4287 } else { 4288 // Check whether we should add a new map block or whether the last one can 4289 // be extended 4290 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4291 OopMapBlock* const last_map = first_map + map_count - 1; 4292 4293 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4294 if (next_offset == first_nonstatic_oop_offset) { 4295 // There is no gap bettwen superklass's last oop field and first 4296 // local oop field, merge maps. 4297 nonstatic_oop_map_count -= 1; 4298 } else { 4299 // Superklass didn't end with a oop field, add extra maps 4300 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4301 } 4302 map_count += nonstatic_oop_map_count; 4303 } 4304 } 4305 return map_count; 4306 } 4307 4308 4309 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4310 unsigned int nonstatic_oop_map_count, 4311 int* nonstatic_oop_offsets, 4312 unsigned int* nonstatic_oop_counts) { 4313 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4314 const InstanceKlass* const super = k->superklass(); 4315 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4316 if (super_count > 0) { 4317 // Copy maps from superklass 4318 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4319 for (unsigned int i = 0; i < super_count; ++i) { 4320 *this_oop_map++ = *super_oop_map++; 4321 } 4322 } 4323 4324 if (nonstatic_oop_map_count > 0) { 4325 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4326 // The counts differ because there is no gap between superklass's last oop 4327 // field and the first local oop field. Extend the last oop map copied 4328 // from the superklass instead of creating new one. 4329 nonstatic_oop_map_count--; 4330 nonstatic_oop_offsets++; 4331 this_oop_map--; 4332 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4333 this_oop_map++; 4334 } 4335 4336 // Add new map blocks, fill them 4337 while (nonstatic_oop_map_count-- > 0) { 4338 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4339 this_oop_map->set_count(*nonstatic_oop_counts++); 4340 this_oop_map++; 4341 } 4342 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4343 this_oop_map, "sanity"); 4344 } 4345 } 4346 4347 4348 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4349 Klass* super = k->super(); 4350 4351 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4352 // in which case we don't have to register objects as finalizable 4353 if (!_has_empty_finalizer) { 4354 if (_has_finalizer || 4355 (super != NULL && super->has_finalizer())) { 4356 k->set_has_finalizer(); 4357 } 4358 } 4359 4360 #ifdef ASSERT 4361 bool f = false; 4362 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4363 vmSymbols::void_method_signature()); 4364 if (m != NULL && !m->is_empty_method()) { 4365 f = true; 4366 } 4367 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4368 #endif 4369 4370 // Check if this klass supports the java.lang.Cloneable interface 4371 if (SystemDictionary::Cloneable_klass_loaded()) { 4372 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4373 k->set_is_cloneable(); 4374 } 4375 } 4376 4377 // Check if this klass has a vanilla default constructor 4378 if (super == NULL) { 4379 // java.lang.Object has empty default constructor 4380 k->set_has_vanilla_constructor(); 4381 } else { 4382 if (super->has_vanilla_constructor() && 4383 _has_vanilla_constructor) { 4384 k->set_has_vanilla_constructor(); 4385 } 4386 #ifdef ASSERT 4387 bool v = false; 4388 if (super->has_vanilla_constructor()) { 4389 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4390 ), vmSymbols::void_method_signature()); 4391 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4392 v = true; 4393 } 4394 } 4395 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4396 #endif 4397 } 4398 4399 // If it cannot be fast-path allocated, set a bit in the layout helper. 4400 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4401 assert(k->size_helper() > 0, "layout_helper is initialized"); 4402 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4403 || k->is_abstract() || k->is_interface() 4404 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4405 || k->size_helper() >= FastAllocateSizeLimit) { 4406 // Forbid fast-path allocation. 4407 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4408 k->set_layout_helper(lh); 4409 } 4410 } 4411 4412 // Attach super classes and interface classes to class loader data 4413 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4414 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4415 if (defining_loader_data->is_the_null_class_loader_data()) { 4416 // Dependencies to null class loader data are implicit. 4417 return; 4418 } else { 4419 // add super class dependency 4420 Klass* super = defined_klass->super(); 4421 if (super != NULL) { 4422 defining_loader_data->record_dependency(super, CHECK); 4423 } 4424 4425 // add super interface dependencies 4426 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4427 if (local_interfaces != NULL) { 4428 int length = local_interfaces->length(); 4429 for (int i = 0; i < length; i++) { 4430 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4431 } 4432 } 4433 } 4434 } 4435 4436 // utility methods for appending an array with check for duplicates 4437 4438 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4439 // iterate over new interfaces 4440 for (int i = 0; i < ifs->length(); i++) { 4441 Klass* e = ifs->at(i); 4442 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4443 // add new interface 4444 result->append_if_missing(e); 4445 } 4446 } 4447 4448 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4449 instanceKlassHandle super, 4450 Array<Klass*>* local_ifs, TRAPS) { 4451 // Compute maximum size for transitive interfaces 4452 int max_transitive_size = 0; 4453 int super_size = 0; 4454 // Add superclass transitive interfaces size 4455 if (super.not_null()) { 4456 super_size = super->transitive_interfaces()->length(); 4457 max_transitive_size += super_size; 4458 } 4459 // Add local interfaces' super interfaces 4460 int local_size = local_ifs->length(); 4461 for (int i = 0; i < local_size; i++) { 4462 Klass* l = local_ifs->at(i); 4463 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4464 } 4465 // Finally add local interfaces 4466 max_transitive_size += local_size; 4467 // Construct array 4468 if (max_transitive_size == 0) { 4469 // no interfaces, use canonicalized array 4470 return Universe::the_empty_klass_array(); 4471 } else if (max_transitive_size == super_size) { 4472 // no new local interfaces added, share superklass' transitive interface array 4473 return super->transitive_interfaces(); 4474 } else if (max_transitive_size == local_size) { 4475 // only local interfaces added, share local interface array 4476 return local_ifs; 4477 } else { 4478 ResourceMark rm; 4479 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4480 4481 // Copy down from superclass 4482 if (super.not_null()) { 4483 append_interfaces(result, super->transitive_interfaces()); 4484 } 4485 4486 // Copy down from local interfaces' superinterfaces 4487 for (int i = 0; i < local_ifs->length(); i++) { 4488 Klass* l = local_ifs->at(i); 4489 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4490 } 4491 // Finally add local interfaces 4492 append_interfaces(result, local_ifs); 4493 4494 // length will be less than the max_transitive_size if duplicates were removed 4495 int length = result->length(); 4496 assert(length <= max_transitive_size, "just checking"); 4497 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4498 for (int i = 0; i < length; i++) { 4499 Klass* e = result->at(i); 4500 assert(e != NULL, "just checking"); 4501 new_result->at_put(i, e); 4502 } 4503 return new_result; 4504 } 4505 } 4506 4507 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4508 Klass* super = this_klass->super(); 4509 if ((super != NULL) && 4510 (!Reflection::verify_class_access(this_klass(), super, false))) { 4511 ResourceMark rm(THREAD); 4512 Exceptions::fthrow( 4513 THREAD_AND_LOCATION, 4514 vmSymbols::java_lang_IllegalAccessError(), 4515 "class %s cannot access its superclass %s", 4516 this_klass->external_name(), 4517 InstanceKlass::cast(super)->external_name() 4518 ); 4519 return; 4520 } 4521 } 4522 4523 4524 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4525 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4526 int lng = local_interfaces->length(); 4527 for (int i = lng - 1; i >= 0; i--) { 4528 Klass* k = local_interfaces->at(i); 4529 assert (k != NULL && k->is_interface(), "invalid interface"); 4530 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4531 ResourceMark rm(THREAD); 4532 Exceptions::fthrow( 4533 THREAD_AND_LOCATION, 4534 vmSymbols::java_lang_IllegalAccessError(), 4535 "class %s cannot access its superinterface %s", 4536 this_klass->external_name(), 4537 InstanceKlass::cast(k)->external_name() 4538 ); 4539 return; 4540 } 4541 } 4542 } 4543 4544 4545 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4546 Array<Method*>* methods = this_klass->methods(); 4547 int num_methods = methods->length(); 4548 4549 // go thru each method and check if it overrides a final method 4550 for (int index = 0; index < num_methods; index++) { 4551 Method* m = methods->at(index); 4552 4553 // skip private, static, and <init> methods 4554 if ((!m->is_private() && !m->is_static()) && 4555 (m->name() != vmSymbols::object_initializer_name())) { 4556 4557 Symbol* name = m->name(); 4558 Symbol* signature = m->signature(); 4559 Klass* k = this_klass->super(); 4560 Method* super_m = NULL; 4561 while (k != NULL) { 4562 // skip supers that don't have final methods. 4563 if (k->has_final_method()) { 4564 // lookup a matching method in the super class hierarchy 4565 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4566 if (super_m == NULL) { 4567 break; // didn't find any match; get out 4568 } 4569 4570 if (super_m->is_final() && !super_m->is_static() && 4571 // matching method in super is final, and not static 4572 (Reflection::verify_field_access(this_klass(), 4573 super_m->method_holder(), 4574 super_m->method_holder(), 4575 super_m->access_flags(), false)) 4576 // this class can access super final method and therefore override 4577 ) { 4578 ResourceMark rm(THREAD); 4579 Exceptions::fthrow( 4580 THREAD_AND_LOCATION, 4581 vmSymbols::java_lang_VerifyError(), 4582 "class %s overrides final method %s.%s", 4583 this_klass->external_name(), 4584 name->as_C_string(), 4585 signature->as_C_string() 4586 ); 4587 return; 4588 } 4589 4590 // continue to look from super_m's holder's super. 4591 k = super_m->method_holder()->super(); 4592 continue; 4593 } 4594 4595 k = k->super(); 4596 } 4597 } 4598 } 4599 } 4600 4601 4602 // assumes that this_klass is an interface 4603 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4604 assert(this_klass->is_interface(), "not an interface"); 4605 Array<Method*>* methods = this_klass->methods(); 4606 int num_methods = methods->length(); 4607 4608 for (int index = 0; index < num_methods; index++) { 4609 Method* m = methods->at(index); 4610 // if m is static and not the init method, throw a verify error 4611 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4612 ResourceMark rm(THREAD); 4613 Exceptions::fthrow( 4614 THREAD_AND_LOCATION, 4615 vmSymbols::java_lang_VerifyError(), 4616 "Illegal static method %s in interface %s", 4617 m->name()->as_C_string(), 4618 this_klass->external_name() 4619 ); 4620 return; 4621 } 4622 } 4623 } 4624 4625 // utility methods for format checking 4626 4627 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4628 if (!_need_verify) { return; } 4629 4630 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4631 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4632 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4633 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4634 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4635 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4636 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4637 4638 if ((is_abstract && is_final) || 4639 (is_interface && !is_abstract) || 4640 (is_interface && major_gte_15 && (is_super || is_enum)) || 4641 (!is_interface && major_gte_15 && is_annotation)) { 4642 ResourceMark rm(THREAD); 4643 Exceptions::fthrow( 4644 THREAD_AND_LOCATION, 4645 vmSymbols::java_lang_ClassFormatError(), 4646 "Illegal class modifiers in class %s: 0x%X", 4647 _class_name->as_C_string(), flags 4648 ); 4649 return; 4650 } 4651 } 4652 4653 bool ClassFileParser::has_illegal_visibility(jint flags) { 4654 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4655 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4656 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4657 4658 return ((is_public && is_protected) || 4659 (is_public && is_private) || 4660 (is_protected && is_private)); 4661 } 4662 4663 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4664 u2 max_version = 4665 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : 4666 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION); 4667 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4668 (major <= max_version) && 4669 ((major != max_version) || 4670 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4671 } 4672 4673 void ClassFileParser::verify_legal_field_modifiers( 4674 jint flags, bool is_interface, TRAPS) { 4675 if (!_need_verify) { return; } 4676 4677 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4678 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4679 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4680 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4681 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4682 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4683 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4684 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4685 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4686 4687 bool is_illegal = false; 4688 4689 if (is_interface) { 4690 if (!is_public || !is_static || !is_final || is_private || 4691 is_protected || is_volatile || is_transient || 4692 (major_gte_15 && is_enum)) { 4693 is_illegal = true; 4694 } 4695 } else { // not interface 4696 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4697 is_illegal = true; 4698 } 4699 } 4700 4701 if (is_illegal) { 4702 ResourceMark rm(THREAD); 4703 Exceptions::fthrow( 4704 THREAD_AND_LOCATION, 4705 vmSymbols::java_lang_ClassFormatError(), 4706 "Illegal field modifiers in class %s: 0x%X", 4707 _class_name->as_C_string(), flags); 4708 return; 4709 } 4710 } 4711 4712 void ClassFileParser::verify_legal_method_modifiers( 4713 jint flags, bool is_interface, Symbol* name, TRAPS) { 4714 if (!_need_verify) { return; } 4715 4716 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4717 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4718 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4719 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4720 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4721 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4722 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4723 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4724 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4725 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4726 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4727 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4728 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4729 4730 bool is_illegal = false; 4731 4732 if (is_interface) { 4733 if (major_gte_8) { 4734 // Class file version is JAVA_8_VERSION or later Methods of 4735 // interfaces may set any of the flags except ACC_PROTECTED, 4736 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4737 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4738 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4739 (is_native || is_protected || is_final || is_synchronized) || 4740 // If a specific method of a class or interface has its 4741 // ACC_ABSTRACT flag set, it must not have any of its 4742 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4743 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4744 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4745 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4746 (is_abstract && (is_private || is_static || is_strict))) { 4747 is_illegal = true; 4748 } 4749 } else if (major_gte_15) { 4750 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4751 if (!is_public || is_static || is_final || is_synchronized || 4752 is_native || !is_abstract || is_strict) { 4753 is_illegal = true; 4754 } 4755 } else { 4756 // Class file version is pre-JAVA_1_5_VERSION 4757 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4758 is_illegal = true; 4759 } 4760 } 4761 } else { // not interface 4762 if (is_initializer) { 4763 if (is_static || is_final || is_synchronized || is_native || 4764 is_abstract || (major_gte_15 && is_bridge)) { 4765 is_illegal = true; 4766 } 4767 } else { // not initializer 4768 if (is_abstract) { 4769 if ((is_final || is_native || is_private || is_static || 4770 (major_gte_15 && (is_synchronized || is_strict)))) { 4771 is_illegal = true; 4772 } 4773 } 4774 if (has_illegal_visibility(flags)) { 4775 is_illegal = true; 4776 } 4777 } 4778 } 4779 4780 if (is_illegal) { 4781 ResourceMark rm(THREAD); 4782 Exceptions::fthrow( 4783 THREAD_AND_LOCATION, 4784 vmSymbols::java_lang_ClassFormatError(), 4785 "Method %s in class %s has illegal modifiers: 0x%X", 4786 name->as_C_string(), _class_name->as_C_string(), flags); 4787 return; 4788 } 4789 } 4790 4791 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4792 assert(_need_verify, "only called when _need_verify is true"); 4793 int i = 0; 4794 int count = length >> 2; 4795 for (int k=0; k<count; k++) { 4796 unsigned char b0 = buffer[i]; 4797 unsigned char b1 = buffer[i+1]; 4798 unsigned char b2 = buffer[i+2]; 4799 unsigned char b3 = buffer[i+3]; 4800 // For an unsigned char v, 4801 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4802 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4803 unsigned char res = b0 | b0 - 1 | 4804 b1 | b1 - 1 | 4805 b2 | b2 - 1 | 4806 b3 | b3 - 1; 4807 if (res >= 128) break; 4808 i += 4; 4809 } 4810 for(; i < length; i++) { 4811 unsigned short c; 4812 // no embedded zeros 4813 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4814 if(buffer[i] < 128) { 4815 continue; 4816 } 4817 if ((i + 5) < length) { // see if it's legal supplementary character 4818 if (UTF8::is_supplementary_character(&buffer[i])) { 4819 c = UTF8::get_supplementary_character(&buffer[i]); 4820 i += 5; 4821 continue; 4822 } 4823 } 4824 switch (buffer[i] >> 4) { 4825 default: break; 4826 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4827 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4828 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4829 c = (buffer[i] & 0x1F) << 6; 4830 i++; 4831 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4832 c += buffer[i] & 0x3F; 4833 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4834 // for classes with major > 47, c must a null or a character in its shortest form 4835 break; 4836 } 4837 } 4838 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4839 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4840 c = (buffer[i] & 0xF) << 12; 4841 i += 2; 4842 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4843 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4844 if (_major_version <= 47 || c >= 0x800) { 4845 // for classes with major > 47, c must be in its shortest form 4846 break; 4847 } 4848 } 4849 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4850 } // end of switch 4851 } // end of for 4852 } 4853 4854 // Checks if name is a legal class name. 4855 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4856 if (!_need_verify || _relax_verify) { return; } 4857 4858 char buf[fixed_buffer_size]; 4859 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4860 unsigned int length = name->utf8_length(); 4861 bool legal = false; 4862 4863 if (length > 0) { 4864 char* p; 4865 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4866 p = skip_over_field_signature(bytes, false, length, CHECK); 4867 legal = (p != NULL) && ((p - bytes) == (int)length); 4868 } else if (_major_version < JAVA_1_5_VERSION) { 4869 if (bytes[0] != '<') { 4870 p = skip_over_field_name(bytes, true, length); 4871 legal = (p != NULL) && ((p - bytes) == (int)length); 4872 } 4873 } else { 4874 // 4900761: relax the constraints based on JSR202 spec 4875 // Class names may be drawn from the entire Unicode character set. 4876 // Identifiers between '/' must be unqualified names. 4877 // The utf8 string has been verified when parsing cpool entries. 4878 legal = verify_unqualified_name(bytes, length, LegalClass); 4879 } 4880 } 4881 if (!legal) { 4882 ResourceMark rm(THREAD); 4883 Exceptions::fthrow( 4884 THREAD_AND_LOCATION, 4885 vmSymbols::java_lang_ClassFormatError(), 4886 "Illegal class name \"%s\" in class file %s", bytes, 4887 _class_name->as_C_string() 4888 ); 4889 return; 4890 } 4891 } 4892 4893 // Checks if name is a legal field name. 4894 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 4895 if (!_need_verify || _relax_verify) { return; } 4896 4897 char buf[fixed_buffer_size]; 4898 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4899 unsigned int length = name->utf8_length(); 4900 bool legal = false; 4901 4902 if (length > 0) { 4903 if (_major_version < JAVA_1_5_VERSION) { 4904 if (bytes[0] != '<') { 4905 char* p = skip_over_field_name(bytes, false, length); 4906 legal = (p != NULL) && ((p - bytes) == (int)length); 4907 } 4908 } else { 4909 // 4881221: relax the constraints based on JSR202 spec 4910 legal = verify_unqualified_name(bytes, length, LegalField); 4911 } 4912 } 4913 4914 if (!legal) { 4915 ResourceMark rm(THREAD); 4916 Exceptions::fthrow( 4917 THREAD_AND_LOCATION, 4918 vmSymbols::java_lang_ClassFormatError(), 4919 "Illegal field name \"%s\" in class %s", bytes, 4920 _class_name->as_C_string() 4921 ); 4922 return; 4923 } 4924 } 4925 4926 // Checks if name is a legal method name. 4927 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 4928 if (!_need_verify || _relax_verify) { return; } 4929 4930 assert(name != NULL, "method name is null"); 4931 char buf[fixed_buffer_size]; 4932 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4933 unsigned int length = name->utf8_length(); 4934 bool legal = false; 4935 4936 if (length > 0) { 4937 if (bytes[0] == '<') { 4938 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 4939 legal = true; 4940 } 4941 } else if (_major_version < JAVA_1_5_VERSION) { 4942 char* p; 4943 p = skip_over_field_name(bytes, false, length); 4944 legal = (p != NULL) && ((p - bytes) == (int)length); 4945 } else { 4946 // 4881221: relax the constraints based on JSR202 spec 4947 legal = verify_unqualified_name(bytes, length, LegalMethod); 4948 } 4949 } 4950 4951 if (!legal) { 4952 ResourceMark rm(THREAD); 4953 Exceptions::fthrow( 4954 THREAD_AND_LOCATION, 4955 vmSymbols::java_lang_ClassFormatError(), 4956 "Illegal method name \"%s\" in class %s", bytes, 4957 _class_name->as_C_string() 4958 ); 4959 return; 4960 } 4961 } 4962 4963 4964 // Checks if signature is a legal field signature. 4965 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 4966 if (!_need_verify) { return; } 4967 4968 char buf[fixed_buffer_size]; 4969 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4970 unsigned int length = signature->utf8_length(); 4971 char* p = skip_over_field_signature(bytes, false, length, CHECK); 4972 4973 if (p == NULL || (p - bytes) != (int)length) { 4974 throwIllegalSignature("Field", name, signature, CHECK); 4975 } 4976 } 4977 4978 // Checks if signature is a legal method signature. 4979 // Returns number of parameters 4980 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 4981 if (!_need_verify) { 4982 // make sure caller's args_size will be less than 0 even for non-static 4983 // method so it will be recomputed in compute_size_of_parameters(). 4984 return -2; 4985 } 4986 4987 unsigned int args_size = 0; 4988 char buf[fixed_buffer_size]; 4989 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4990 unsigned int length = signature->utf8_length(); 4991 char* nextp; 4992 4993 // The first character must be a '(' 4994 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 4995 length--; 4996 // Skip over legal field signatures 4997 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4998 while ((length > 0) && (nextp != NULL)) { 4999 args_size++; 5000 if (p[0] == 'J' || p[0] == 'D') { 5001 args_size++; 5002 } 5003 length -= nextp - p; 5004 p = nextp; 5005 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5006 } 5007 // The first non-signature thing better be a ')' 5008 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5009 length--; 5010 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5011 // All internal methods must return void 5012 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5013 return args_size; 5014 } 5015 } else { 5016 // Now we better just have a return value 5017 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5018 if (nextp && ((int)length == (nextp - p))) { 5019 return args_size; 5020 } 5021 } 5022 } 5023 } 5024 // Report error 5025 throwIllegalSignature("Method", name, signature, CHECK_0); 5026 return 0; 5027 } 5028 5029 5030 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5031 // Method names also may not contain the characters '<' or '>', unless <init> 5032 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5033 // method. Because these names have been checked as special cases before 5034 // calling this method in verify_legal_method_name. 5035 bool ClassFileParser::verify_unqualified_name( 5036 char* name, unsigned int length, int type) { 5037 jchar ch; 5038 5039 for (char* p = name; p != name + length; ) { 5040 ch = *p; 5041 if (ch < 128) { 5042 p++; 5043 if (ch == '.' || ch == ';' || ch == '[' ) { 5044 return false; // do not permit '.', ';', or '[' 5045 } 5046 if (type != LegalClass && ch == '/') { 5047 return false; // do not permit '/' unless it's class name 5048 } 5049 if (type == LegalMethod && (ch == '<' || ch == '>')) { 5050 return false; // do not permit '<' or '>' in method names 5051 } 5052 } else { 5053 char* tmp_p = UTF8::next(p, &ch); 5054 p = tmp_p; 5055 } 5056 } 5057 return true; 5058 } 5059 5060 5061 // Take pointer to a string. Skip over the longest part of the string that could 5062 // be taken as a fieldname. Allow '/' if slash_ok is true. 5063 // Return a pointer to just past the fieldname. 5064 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5065 // being true, we saw consecutive slashes (meaning we were looking for a 5066 // qualified path but found something that was badly-formed). 5067 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5068 char* p; 5069 jchar ch; 5070 jboolean last_is_slash = false; 5071 jboolean not_first_ch = false; 5072 5073 for (p = name; p != name + length; not_first_ch = true) { 5074 char* old_p = p; 5075 ch = *p; 5076 if (ch < 128) { 5077 p++; 5078 // quick check for ascii 5079 if ((ch >= 'a' && ch <= 'z') || 5080 (ch >= 'A' && ch <= 'Z') || 5081 (ch == '_' || ch == '$') || 5082 (not_first_ch && ch >= '0' && ch <= '9')) { 5083 last_is_slash = false; 5084 continue; 5085 } 5086 if (slash_ok && ch == '/') { 5087 if (last_is_slash) { 5088 return NULL; // Don't permit consecutive slashes 5089 } 5090 last_is_slash = true; 5091 continue; 5092 } 5093 } else { 5094 jint unicode_ch; 5095 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5096 p = tmp_p; 5097 last_is_slash = false; 5098 // Check if ch is Java identifier start or is Java identifier part 5099 // 4672820: call java.lang.Character methods directly without generating separate tables. 5100 EXCEPTION_MARK; 5101 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5102 5103 // return value 5104 JavaValue result(T_BOOLEAN); 5105 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5106 JavaCallArguments args; 5107 args.push_int(unicode_ch); 5108 5109 // public static boolean isJavaIdentifierStart(char ch); 5110 JavaCalls::call_static(&result, 5111 klass, 5112 vmSymbols::isJavaIdentifierStart_name(), 5113 vmSymbols::int_bool_signature(), 5114 &args, 5115 THREAD); 5116 5117 if (HAS_PENDING_EXCEPTION) { 5118 CLEAR_PENDING_EXCEPTION; 5119 return 0; 5120 } 5121 if (result.get_jboolean()) { 5122 continue; 5123 } 5124 5125 if (not_first_ch) { 5126 // public static boolean isJavaIdentifierPart(char ch); 5127 JavaCalls::call_static(&result, 5128 klass, 5129 vmSymbols::isJavaIdentifierPart_name(), 5130 vmSymbols::int_bool_signature(), 5131 &args, 5132 THREAD); 5133 5134 if (HAS_PENDING_EXCEPTION) { 5135 CLEAR_PENDING_EXCEPTION; 5136 return 0; 5137 } 5138 5139 if (result.get_jboolean()) { 5140 continue; 5141 } 5142 } 5143 } 5144 return (not_first_ch) ? old_p : NULL; 5145 } 5146 return (not_first_ch) ? p : NULL; 5147 } 5148 5149 5150 // Take pointer to a string. Skip over the longest part of the string that could 5151 // be taken as a field signature. Allow "void" if void_ok. 5152 // Return a pointer to just past the signature. 5153 // Return NULL if no legal signature is found. 5154 char* ClassFileParser::skip_over_field_signature(char* signature, 5155 bool void_ok, 5156 unsigned int length, 5157 TRAPS) { 5158 unsigned int array_dim = 0; 5159 while (length > 0) { 5160 switch (signature[0]) { 5161 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5162 case JVM_SIGNATURE_BOOLEAN: 5163 case JVM_SIGNATURE_BYTE: 5164 case JVM_SIGNATURE_CHAR: 5165 case JVM_SIGNATURE_SHORT: 5166 case JVM_SIGNATURE_INT: 5167 case JVM_SIGNATURE_FLOAT: 5168 case JVM_SIGNATURE_LONG: 5169 case JVM_SIGNATURE_DOUBLE: 5170 return signature + 1; 5171 case JVM_SIGNATURE_CLASS: { 5172 if (_major_version < JAVA_1_5_VERSION) { 5173 // Skip over the class name if one is there 5174 char* p = skip_over_field_name(signature + 1, true, --length); 5175 5176 // The next character better be a semicolon 5177 if (p && (p - signature) > 1 && p[0] == ';') { 5178 return p + 1; 5179 } 5180 } else { 5181 // 4900761: For class version > 48, any unicode is allowed in class name. 5182 length--; 5183 signature++; 5184 while (length > 0 && signature[0] != ';') { 5185 if (signature[0] == '.') { 5186 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5187 } 5188 length--; 5189 signature++; 5190 } 5191 if (signature[0] == ';') { return signature + 1; } 5192 } 5193 5194 return NULL; 5195 } 5196 case JVM_SIGNATURE_ARRAY: 5197 array_dim++; 5198 if (array_dim > 255) { 5199 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5200 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5201 } 5202 // The rest of what's there better be a legal signature 5203 signature++; 5204 length--; 5205 void_ok = false; 5206 break; 5207 5208 default: 5209 return NULL; 5210 } 5211 } 5212 return NULL; 5213 }