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