1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileParser.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/defaultMethods.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #if INCLUDE_CDS 35 #include "classfile/systemDictionaryShared.hpp" 36 #endif 37 #include "classfile/verificationType.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "memory/allocation.hpp" 41 #include "memory/gcLocker.hpp" 42 #include "memory/metadataFactory.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/referenceType.hpp" 45 #include "memory/universe.inline.hpp" 46 #include "oops/constantPool.hpp" 47 #include "oops/fieldStreams.hpp" 48 #include "oops/instanceKlass.hpp" 49 #include "oops/instanceMirrorKlass.hpp" 50 #include "oops/klass.inline.hpp" 51 #include "oops/klassVtable.hpp" 52 #include "oops/method.hpp" 53 #include "oops/symbol.hpp" 54 #include "prims/jvm.h" 55 #include "prims/jvmtiExport.hpp" 56 #include "prims/jvmtiThreadState.hpp" 57 #include "runtime/javaCalls.hpp" 58 #include "runtime/perfData.hpp" 59 #include "runtime/reflection.hpp" 60 #include "runtime/signature.hpp" 61 #include "runtime/timer.hpp" 62 #include "services/classLoadingService.hpp" 63 #include "services/threadService.hpp" 64 #include "utilities/array.hpp" 65 #include "utilities/globalDefinitions.hpp" 66 #include "utilities/ostream.hpp" 67 68 // We generally try to create the oops directly when parsing, rather than 69 // allocating temporary data structures and copying the bytes twice. A 70 // temporary area is only needed when parsing utf8 entries in the constant 71 // pool and when parsing line number tables. 72 73 // We add assert in debug mode when class format is not checked. 74 75 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 76 #define JAVA_MIN_SUPPORTED_VERSION 45 77 #define JAVA_MAX_SUPPORTED_VERSION 52 78 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 79 80 // Used for two backward compatibility reasons: 81 // - to check for new additions to the class file format in JDK1.5 82 // - to check for bug fixes in the format checker in JDK1.5 83 #define JAVA_1_5_VERSION 49 84 85 // Used for backward compatibility reasons: 86 // - to check for javac bug fixes that happened after 1.5 87 // - also used as the max version when running in jdk6 88 #define JAVA_6_VERSION 50 89 90 // Used for backward compatibility reasons: 91 // - to check NameAndType_info signatures more aggressively 92 #define JAVA_7_VERSION 51 93 94 // Extension method support. 95 #define JAVA_8_VERSION 52 96 97 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 98 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 99 // this function (_current can be allocated in a register, with scalar 100 // replacement of aggregates). The _current pointer is copied back to 101 // stream() when this function returns. DON'T call another method within 102 // this method that uses stream(). 103 ClassFileStream* cfs0 = stream(); 104 ClassFileStream cfs1 = *cfs0; 105 ClassFileStream* cfs = &cfs1; 106 #ifdef ASSERT 107 assert(cfs->allocated_on_stack(),"should be local"); 108 u1* old_current = cfs0->current(); 109 #endif 110 Handle class_loader(THREAD, _loader_data->class_loader()); 111 112 // Used for batching symbol allocations. 113 const char* names[SymbolTable::symbol_alloc_batch_size]; 114 int lengths[SymbolTable::symbol_alloc_batch_size]; 115 int indices[SymbolTable::symbol_alloc_batch_size]; 116 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 117 int names_count = 0; 118 119 // parsing Index 0 is unused 120 for (int index = 1; index < length; index++) { 121 // Each of the following case guarantees one more byte in the stream 122 // for the following tag or the access_flags following constant pool, 123 // so we don't need bounds-check for reading tag. 124 u1 tag = cfs->get_u1_fast(); 125 switch (tag) { 126 case JVM_CONSTANT_Class : 127 { 128 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 129 u2 name_index = cfs->get_u2_fast(); 130 _cp->klass_index_at_put(index, name_index); 131 } 132 break; 133 case JVM_CONSTANT_Fieldref : 134 { 135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 136 u2 class_index = cfs->get_u2_fast(); 137 u2 name_and_type_index = cfs->get_u2_fast(); 138 _cp->field_at_put(index, class_index, name_and_type_index); 139 } 140 break; 141 case JVM_CONSTANT_Methodref : 142 { 143 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 144 u2 class_index = cfs->get_u2_fast(); 145 u2 name_and_type_index = cfs->get_u2_fast(); 146 _cp->method_at_put(index, class_index, name_and_type_index); 147 } 148 break; 149 case JVM_CONSTANT_InterfaceMethodref : 150 { 151 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 152 u2 class_index = cfs->get_u2_fast(); 153 u2 name_and_type_index = cfs->get_u2_fast(); 154 _cp->interface_method_at_put(index, class_index, name_and_type_index); 155 } 156 break; 157 case JVM_CONSTANT_String : 158 { 159 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 160 u2 string_index = cfs->get_u2_fast(); 161 _cp->string_index_at_put(index, string_index); 162 } 163 break; 164 case JVM_CONSTANT_MethodHandle : 165 case JVM_CONSTANT_MethodType : 166 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 167 classfile_parse_error( 168 "Class file version does not support constant tag %u in class file %s", 169 tag, CHECK); 170 } 171 if (!EnableInvokeDynamic) { 172 classfile_parse_error( 173 "This JVM does not support constant tag %u in class file %s", 174 tag, CHECK); 175 } 176 if (tag == JVM_CONSTANT_MethodHandle) { 177 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 178 u1 ref_kind = cfs->get_u1_fast(); 179 u2 method_index = cfs->get_u2_fast(); 180 _cp->method_handle_index_at_put(index, ref_kind, method_index); 181 } else if (tag == JVM_CONSTANT_MethodType) { 182 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 183 u2 signature_index = cfs->get_u2_fast(); 184 _cp->method_type_index_at_put(index, signature_index); 185 } else { 186 ShouldNotReachHere(); 187 } 188 break; 189 case JVM_CONSTANT_InvokeDynamic : 190 { 191 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 192 classfile_parse_error( 193 "Class file version does not support constant tag %u in class file %s", 194 tag, CHECK); 195 } 196 if (!EnableInvokeDynamic) { 197 classfile_parse_error( 198 "This JVM does not support constant tag %u in class file %s", 199 tag, CHECK); 200 } 201 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 202 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 203 u2 name_and_type_index = cfs->get_u2_fast(); 204 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 205 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 206 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 207 } 208 break; 209 case JVM_CONSTANT_Integer : 210 { 211 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 212 u4 bytes = cfs->get_u4_fast(); 213 _cp->int_at_put(index, (jint) bytes); 214 } 215 break; 216 case JVM_CONSTANT_Float : 217 { 218 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 219 u4 bytes = cfs->get_u4_fast(); 220 _cp->float_at_put(index, *(jfloat*)&bytes); 221 } 222 break; 223 case JVM_CONSTANT_Long : 224 // A mangled type might cause you to overrun allocated memory 225 guarantee_property(index+1 < length, 226 "Invalid constant pool entry %u in class file %s", 227 index, CHECK); 228 { 229 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 230 u8 bytes = cfs->get_u8_fast(); 231 _cp->long_at_put(index, bytes); 232 } 233 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 234 break; 235 case JVM_CONSTANT_Double : 236 // A mangled type might cause you to overrun allocated memory 237 guarantee_property(index+1 < length, 238 "Invalid constant pool entry %u in class file %s", 239 index, CHECK); 240 { 241 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 242 u8 bytes = cfs->get_u8_fast(); 243 _cp->double_at_put(index, *(jdouble*)&bytes); 244 } 245 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 246 break; 247 case JVM_CONSTANT_NameAndType : 248 { 249 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 250 u2 name_index = cfs->get_u2_fast(); 251 u2 signature_index = cfs->get_u2_fast(); 252 _cp->name_and_type_at_put(index, name_index, signature_index); 253 } 254 break; 255 case JVM_CONSTANT_Utf8 : 256 { 257 cfs->guarantee_more(2, CHECK); // utf8_length 258 u2 utf8_length = cfs->get_u2_fast(); 259 u1* utf8_buffer = cfs->get_u1_buffer(); 260 assert(utf8_buffer != NULL, "null utf8 buffer"); 261 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 262 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 263 cfs->skip_u1_fast(utf8_length); 264 265 // Before storing the symbol, make sure it's legal 266 if (_need_verify) { 267 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 268 } 269 270 if (EnableInvokeDynamic && has_cp_patch_at(index)) { 271 Handle patch = clear_cp_patch_at(index); 272 guarantee_property(java_lang_String::is_instance(patch()), 273 "Illegal utf8 patch at %d in class file %s", 274 index, CHECK); 275 char* str = java_lang_String::as_utf8_string(patch()); 276 // (could use java_lang_String::as_symbol instead, but might as well batch them) 277 utf8_buffer = (u1*) str; 278 utf8_length = (u2) strlen(str); 279 } 280 281 unsigned int hash; 282 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 283 if (result == NULL) { 284 names[names_count] = (char*)utf8_buffer; 285 lengths[names_count] = utf8_length; 286 indices[names_count] = index; 287 hashValues[names_count++] = hash; 288 if (names_count == SymbolTable::symbol_alloc_batch_size) { 289 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 290 names_count = 0; 291 } 292 } else { 293 _cp->symbol_at_put(index, result); 294 } 295 } 296 break; 297 default: 298 classfile_parse_error( 299 "Unknown constant tag %u in class file %s", tag, CHECK); 300 break; 301 } 302 } 303 304 // Allocate the remaining symbols 305 if (names_count > 0) { 306 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 307 } 308 309 // Copy _current pointer of local copy back to stream(). 310 #ifdef ASSERT 311 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 312 #endif 313 cfs0->set_current(cfs1.current()); 314 } 315 316 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 317 318 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 319 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 320 return cp->symbol_at(index); 321 else 322 return NULL; 323 } 324 325 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 326 ClassFileStream* cfs = stream(); 327 constantPoolHandle nullHandle; 328 329 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 330 u2 length = cfs->get_u2_fast(); 331 guarantee_property( 332 length >= 1, "Illegal constant pool size %u in class file %s", 333 length, CHECK_(nullHandle)); 334 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 335 CHECK_(nullHandle)); 336 _cp = constant_pool; // save in case of errors 337 constantPoolHandle cp (THREAD, constant_pool); 338 339 // parsing constant pool entries 340 parse_constant_pool_entries(length, CHECK_(nullHandle)); 341 342 int index = 1; // declared outside of loops for portability 343 344 // first verification pass - validate cross references and fixup class and string constants 345 for (index = 1; index < length; index++) { // Index 0 is unused 346 jbyte tag = cp->tag_at(index).value(); 347 switch (tag) { 348 case JVM_CONSTANT_Class : 349 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 350 break; 351 case JVM_CONSTANT_Fieldref : 352 // fall through 353 case JVM_CONSTANT_Methodref : 354 // fall through 355 case JVM_CONSTANT_InterfaceMethodref : { 356 if (!_need_verify) break; 357 int klass_ref_index = cp->klass_ref_index_at(index); 358 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 359 check_property(valid_klass_reference_at(klass_ref_index), 360 "Invalid constant pool index %u in class file %s", 361 klass_ref_index, 362 CHECK_(nullHandle)); 363 check_property(valid_cp_range(name_and_type_ref_index, length) && 364 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 365 "Invalid constant pool index %u in class file %s", 366 name_and_type_ref_index, 367 CHECK_(nullHandle)); 368 break; 369 } 370 case JVM_CONSTANT_String : 371 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 372 break; 373 case JVM_CONSTANT_Integer : 374 break; 375 case JVM_CONSTANT_Float : 376 break; 377 case JVM_CONSTANT_Long : 378 case JVM_CONSTANT_Double : 379 index++; 380 check_property( 381 (index < length && cp->tag_at(index).is_invalid()), 382 "Improper constant pool long/double index %u in class file %s", 383 index, CHECK_(nullHandle)); 384 break; 385 case JVM_CONSTANT_NameAndType : { 386 if (!_need_verify) break; 387 int name_ref_index = cp->name_ref_index_at(index); 388 int signature_ref_index = cp->signature_ref_index_at(index); 389 check_property(valid_symbol_at(name_ref_index), 390 "Invalid constant pool index %u in class file %s", 391 name_ref_index, CHECK_(nullHandle)); 392 check_property(valid_symbol_at(signature_ref_index), 393 "Invalid constant pool index %u in class file %s", 394 signature_ref_index, CHECK_(nullHandle)); 395 break; 396 } 397 case JVM_CONSTANT_Utf8 : 398 break; 399 case JVM_CONSTANT_UnresolvedClass : // fall-through 400 case JVM_CONSTANT_UnresolvedClassInError: 401 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 402 break; 403 case JVM_CONSTANT_ClassIndex : 404 { 405 int class_index = cp->klass_index_at(index); 406 check_property(valid_symbol_at(class_index), 407 "Invalid constant pool index %u in class file %s", 408 class_index, CHECK_(nullHandle)); 409 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 410 } 411 break; 412 case JVM_CONSTANT_StringIndex : 413 { 414 int string_index = cp->string_index_at(index); 415 check_property(valid_symbol_at(string_index), 416 "Invalid constant pool index %u in class file %s", 417 string_index, CHECK_(nullHandle)); 418 Symbol* sym = cp->symbol_at(string_index); 419 cp->unresolved_string_at_put(index, sym); 420 } 421 break; 422 case JVM_CONSTANT_MethodHandle : 423 { 424 int ref_index = cp->method_handle_index_at(index); 425 check_property( 426 valid_cp_range(ref_index, length) && 427 EnableInvokeDynamic, 428 "Invalid constant pool index %u in class file %s", 429 ref_index, CHECK_(nullHandle)); 430 constantTag tag = cp->tag_at(ref_index); 431 int ref_kind = cp->method_handle_ref_kind_at(index); 432 switch (ref_kind) { 433 case JVM_REF_getField: 434 case JVM_REF_getStatic: 435 case JVM_REF_putField: 436 case JVM_REF_putStatic: 437 check_property( 438 tag.is_field(), 439 "Invalid constant pool index %u in class file %s (not a field)", 440 ref_index, CHECK_(nullHandle)); 441 break; 442 case JVM_REF_invokeVirtual: 443 case JVM_REF_newInvokeSpecial: 444 check_property( 445 tag.is_method(), 446 "Invalid constant pool index %u in class file %s (not a method)", 447 ref_index, CHECK_(nullHandle)); 448 break; 449 case JVM_REF_invokeStatic: 450 case JVM_REF_invokeSpecial: 451 check_property(tag.is_method() || 452 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 453 "Invalid constant pool index %u in class file %s (not a method)", 454 ref_index, CHECK_(nullHandle)); 455 break; 456 case JVM_REF_invokeInterface: 457 check_property( 458 tag.is_interface_method(), 459 "Invalid constant pool index %u in class file %s (not an interface method)", 460 ref_index, CHECK_(nullHandle)); 461 break; 462 default: 463 classfile_parse_error( 464 "Bad method handle kind at constant pool index %u in class file %s", 465 index, CHECK_(nullHandle)); 466 } 467 // Keep the ref_index unchanged. It will be indirected at link-time. 468 } 469 break; 470 case JVM_CONSTANT_MethodType : 471 { 472 int ref_index = cp->method_type_index_at(index); 473 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic, 474 "Invalid constant pool index %u in class file %s", 475 ref_index, CHECK_(nullHandle)); 476 } 477 break; 478 case JVM_CONSTANT_InvokeDynamic : 479 { 480 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 481 check_property(valid_cp_range(name_and_type_ref_index, length) && 482 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 483 "Invalid constant pool index %u in class file %s", 484 name_and_type_ref_index, 485 CHECK_(nullHandle)); 486 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 487 break; 488 } 489 default: 490 fatal(err_msg("bad constant pool tag value %u", 491 cp->tag_at(index).value())); 492 ShouldNotReachHere(); 493 break; 494 } // end of switch 495 } // end of for 496 497 if (_cp_patches != NULL) { 498 // need to treat this_class specially... 499 assert(EnableInvokeDynamic, ""); 500 int this_class_index; 501 { 502 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 503 u1* mark = cfs->current(); 504 u2 flags = cfs->get_u2_fast(); 505 this_class_index = cfs->get_u2_fast(); 506 cfs->set_current(mark); // revert to mark 507 } 508 509 for (index = 1; index < length; index++) { // Index 0 is unused 510 if (has_cp_patch_at(index)) { 511 guarantee_property(index != this_class_index, 512 "Illegal constant pool patch to self at %d in class file %s", 513 index, CHECK_(nullHandle)); 514 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 515 } 516 } 517 } 518 519 if (!_need_verify) { 520 return cp; 521 } 522 523 // second verification pass - checks the strings are of the right format. 524 // but not yet to the other entries 525 for (index = 1; index < length; index++) { 526 jbyte tag = cp->tag_at(index).value(); 527 switch (tag) { 528 case JVM_CONSTANT_UnresolvedClass: { 529 Symbol* class_name = cp->unresolved_klass_at(index); 530 // check the name, even if _cp_patches will overwrite it 531 verify_legal_class_name(class_name, CHECK_(nullHandle)); 532 break; 533 } 534 case JVM_CONSTANT_NameAndType: { 535 if (_need_verify && _major_version >= JAVA_7_VERSION) { 536 int sig_index = cp->signature_ref_index_at(index); 537 int name_index = cp->name_ref_index_at(index); 538 Symbol* name = cp->symbol_at(name_index); 539 Symbol* sig = cp->symbol_at(sig_index); 540 guarantee_property(sig->utf8_length() != 0, 541 "Illegal zero length constant pool entry at %d in class %s", 542 sig_index, CHECK_(nullHandle)); 543 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 544 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 545 } else { 546 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 547 } 548 } 549 break; 550 } 551 case JVM_CONSTANT_InvokeDynamic: 552 case JVM_CONSTANT_Fieldref: 553 case JVM_CONSTANT_Methodref: 554 case JVM_CONSTANT_InterfaceMethodref: { 555 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 556 // already verified to be utf8 557 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 558 // already verified to be utf8 559 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 560 Symbol* name = cp->symbol_at(name_ref_index); 561 Symbol* signature = cp->symbol_at(signature_ref_index); 562 if (tag == JVM_CONSTANT_Fieldref) { 563 verify_legal_field_name(name, CHECK_(nullHandle)); 564 if (_need_verify && _major_version >= JAVA_7_VERSION) { 565 // Signature is verified above, when iterating NameAndType_info. 566 // Need only to be sure it's non-zero length and the right type. 567 if (signature->utf8_length() == 0 || 568 signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 569 throwIllegalSignature( 570 "Field", name, signature, CHECK_(nullHandle)); 571 } 572 } else { 573 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 574 } 575 } else { 576 verify_legal_method_name(name, CHECK_(nullHandle)); 577 if (_need_verify && _major_version >= JAVA_7_VERSION) { 578 // Signature is verified above, when iterating NameAndType_info. 579 // Need only to be sure it's non-zero length and the right type. 580 if (signature->utf8_length() == 0 || 581 signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 582 throwIllegalSignature( 583 "Method", name, signature, CHECK_(nullHandle)); 584 } 585 } else { 586 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 587 } 588 if (tag == JVM_CONSTANT_Methodref) { 589 // 4509014: If a class method name begins with '<', it must be "<init>". 590 assert(name != NULL, "method name in constant pool is null"); 591 unsigned int name_len = name->utf8_length(); 592 if (name_len != 0 && name->byte_at(0) == '<') { 593 if (name != vmSymbols::object_initializer_name()) { 594 classfile_parse_error( 595 "Bad method name at constant pool index %u in class file %s", 596 name_ref_index, CHECK_(nullHandle)); 597 } 598 } 599 } 600 } 601 break; 602 } 603 case JVM_CONSTANT_MethodHandle: { 604 int ref_index = cp->method_handle_index_at(index); 605 int ref_kind = cp->method_handle_ref_kind_at(index); 606 switch (ref_kind) { 607 case JVM_REF_invokeVirtual: 608 case JVM_REF_invokeStatic: 609 case JVM_REF_invokeSpecial: 610 case JVM_REF_newInvokeSpecial: 611 { 612 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 613 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 614 Symbol* name = cp->symbol_at(name_ref_index); 615 if (ref_kind == JVM_REF_newInvokeSpecial) { 616 if (name != vmSymbols::object_initializer_name()) { 617 classfile_parse_error( 618 "Bad constructor name at constant pool index %u in class file %s", 619 name_ref_index, CHECK_(nullHandle)); 620 } 621 } else { 622 if (name == vmSymbols::object_initializer_name()) { 623 classfile_parse_error( 624 "Bad method name at constant pool index %u in class file %s", 625 name_ref_index, CHECK_(nullHandle)); 626 } 627 } 628 } 629 break; 630 // Other ref_kinds are already fully checked in previous pass. 631 } 632 break; 633 } 634 case JVM_CONSTANT_MethodType: { 635 Symbol* no_name = vmSymbols::type_name(); // place holder 636 Symbol* signature = cp->method_type_signature_at(index); 637 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 638 break; 639 } 640 case JVM_CONSTANT_Utf8: { 641 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 642 } 643 } // end of switch 644 } // end of for 645 646 return cp; 647 } 648 649 650 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 651 assert(EnableInvokeDynamic, ""); 652 BasicType patch_type = T_VOID; 653 654 switch (cp->tag_at(index).value()) { 655 656 case JVM_CONSTANT_UnresolvedClass : 657 // Patching a class means pre-resolving it. 658 // The name in the constant pool is ignored. 659 if (java_lang_Class::is_instance(patch())) { 660 guarantee_property(!java_lang_Class::is_primitive(patch()), 661 "Illegal class patch at %d in class file %s", 662 index, CHECK); 663 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 664 } else { 665 guarantee_property(java_lang_String::is_instance(patch()), 666 "Illegal class patch at %d in class file %s", 667 index, CHECK); 668 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 669 cp->unresolved_klass_at_put(index, name); 670 } 671 break; 672 673 case JVM_CONSTANT_String : 674 // skip this patch and don't clear it. Needs the oop array for resolved 675 // references to be created first. 676 return; 677 678 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 679 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 680 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 681 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 682 patch_prim: 683 { 684 jvalue value; 685 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 686 guarantee_property(value_type == patch_type, 687 "Illegal primitive patch at %d in class file %s", 688 index, CHECK); 689 switch (value_type) { 690 case T_INT: cp->int_at_put(index, value.i); break; 691 case T_FLOAT: cp->float_at_put(index, value.f); break; 692 case T_LONG: cp->long_at_put(index, value.j); break; 693 case T_DOUBLE: cp->double_at_put(index, value.d); break; 694 default: assert(false, ""); 695 } 696 } 697 break; 698 699 default: 700 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 701 guarantee_property(!has_cp_patch_at(index), 702 "Illegal unexpected patch at %d in class file %s", 703 index, CHECK); 704 return; 705 } 706 707 // On fall-through, mark the patch as used. 708 clear_cp_patch_at(index); 709 } 710 711 712 713 class NameSigHash: public ResourceObj { 714 public: 715 Symbol* _name; // name 716 Symbol* _sig; // signature 717 NameSigHash* _next; // Next entry in hash table 718 }; 719 720 721 #define HASH_ROW_SIZE 256 722 723 unsigned int hash(Symbol* name, Symbol* sig) { 724 unsigned int raw_hash = 0; 725 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 726 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 727 728 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 729 } 730 731 732 void initialize_hashtable(NameSigHash** table) { 733 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 734 } 735 736 // Return false if the name/sig combination is found in table. 737 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 738 // The old format checker uses heap sort to find duplicates. 739 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 740 // of table since we don't expect Symbol*'s to move. 741 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 742 assert(name != NULL, "name in constant pool is NULL"); 743 744 // First lookup for duplicates 745 int index = hash(name, sig); 746 NameSigHash* entry = table[index]; 747 while (entry != NULL) { 748 if (entry->_name == name && entry->_sig == sig) { 749 return false; 750 } 751 entry = entry->_next; 752 } 753 754 // No duplicate is found, allocate a new entry and fill it. 755 entry = new NameSigHash(); 756 entry->_name = name; 757 entry->_sig = sig; 758 759 // Insert into hash table 760 entry->_next = table[index]; 761 table[index] = entry; 762 763 return true; 764 } 765 766 767 Array<Klass*>* ClassFileParser::parse_interfaces(int length, 768 Handle protection_domain, 769 Symbol* class_name, 770 bool* has_default_methods, 771 TRAPS) { 772 if (length == 0) { 773 _local_interfaces = Universe::the_empty_klass_array(); 774 } else { 775 ClassFileStream* cfs = stream(); 776 assert(length > 0, "only called for length>0"); 777 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 778 779 int index; 780 for (index = 0; index < length; index++) { 781 u2 interface_index = cfs->get_u2(CHECK_NULL); 782 KlassHandle interf; 783 check_property( 784 valid_klass_reference_at(interface_index), 785 "Interface name has bad constant pool index %u in class file %s", 786 interface_index, CHECK_NULL); 787 if (_cp->tag_at(interface_index).is_klass()) { 788 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 789 } else { 790 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 791 792 // Don't need to check legal name because it's checked when parsing constant pool. 793 // But need to make sure it's not an array type. 794 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 795 "Bad interface name in class file %s", CHECK_NULL); 796 Handle class_loader(THREAD, _loader_data->class_loader()); 797 798 // Call resolve_super so classcircularity is checked 799 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 800 unresolved_klass, class_loader, protection_domain, 801 false, CHECK_NULL); 802 interf = KlassHandle(THREAD, k); 803 } 804 805 if (!interf()->is_interface()) { 806 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 807 } 808 if (InstanceKlass::cast(interf())->has_default_methods()) { 809 *has_default_methods = true; 810 } 811 _local_interfaces->at_put(index, interf()); 812 } 813 814 if (!_need_verify || length <= 1) { 815 return _local_interfaces; 816 } 817 818 // Check if there's any duplicates in interfaces 819 ResourceMark rm(THREAD); 820 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 821 THREAD, NameSigHash*, HASH_ROW_SIZE); 822 initialize_hashtable(interface_names); 823 bool dup = false; 824 Symbol* name = NULL; 825 { 826 debug_only(No_Safepoint_Verifier nsv;) 827 for (index = 0; index < length; index++) { 828 Klass* k = _local_interfaces->at(index); 829 name = InstanceKlass::cast(k)->name(); 830 // If no duplicates, add (name, NULL) in hashtable interface_names. 831 if (!put_after_lookup(name, NULL, interface_names)) { 832 dup = true; 833 break; 834 } 835 } 836 } 837 if (dup) { 838 classfile_parse_error("Duplicate interface name \"%s\" in class file %s", 839 name->as_C_string(), CHECK_NULL); 840 } 841 } 842 return _local_interfaces; 843 } 844 845 846 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 847 // Make sure the constant pool entry is of a type appropriate to this field 848 guarantee_property( 849 (constantvalue_index > 0 && 850 constantvalue_index < _cp->length()), 851 "Bad initial value index %u in ConstantValue attribute in class file %s", 852 constantvalue_index, CHECK); 853 constantTag value_type = _cp->tag_at(constantvalue_index); 854 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 855 case T_LONG: 856 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 857 break; 858 case T_FLOAT: 859 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 860 break; 861 case T_DOUBLE: 862 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 863 break; 864 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 865 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 866 break; 867 case T_OBJECT: 868 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 869 && value_type.is_string()), 870 "Bad string initial value in class file %s", CHECK); 871 break; 872 default: 873 classfile_parse_error( 874 "Unable to set initial value %u in class file %s", 875 constantvalue_index, CHECK); 876 } 877 } 878 879 880 // Parse attributes for a field. 881 void ClassFileParser::parse_field_attributes(u2 attributes_count, 882 bool is_static, u2 signature_index, 883 u2* constantvalue_index_addr, 884 bool* is_synthetic_addr, 885 u2* generic_signature_index_addr, 886 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 887 TRAPS) { 888 ClassFileStream* cfs = stream(); 889 assert(attributes_count > 0, "length should be greater than 0"); 890 u2 constantvalue_index = 0; 891 u2 generic_signature_index = 0; 892 bool is_synthetic = false; 893 u1* runtime_visible_annotations = NULL; 894 int runtime_visible_annotations_length = 0; 895 u1* runtime_invisible_annotations = NULL; 896 int runtime_invisible_annotations_length = 0; 897 u1* runtime_visible_type_annotations = NULL; 898 int runtime_visible_type_annotations_length = 0; 899 u1* runtime_invisible_type_annotations = NULL; 900 int runtime_invisible_type_annotations_length = 0; 901 bool runtime_invisible_type_annotations_exists = false; 902 while (attributes_count--) { 903 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 904 u2 attribute_name_index = cfs->get_u2_fast(); 905 u4 attribute_length = cfs->get_u4_fast(); 906 check_property(valid_symbol_at(attribute_name_index), 907 "Invalid field attribute index %u in class file %s", 908 attribute_name_index, 909 CHECK); 910 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 911 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 912 // ignore if non-static 913 if (constantvalue_index != 0) { 914 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 915 } 916 check_property( 917 attribute_length == 2, 918 "Invalid ConstantValue field attribute length %u in class file %s", 919 attribute_length, CHECK); 920 constantvalue_index = cfs->get_u2(CHECK); 921 if (_need_verify) { 922 verify_constantvalue(constantvalue_index, signature_index, CHECK); 923 } 924 } else if (attribute_name == vmSymbols::tag_synthetic()) { 925 if (attribute_length != 0) { 926 classfile_parse_error( 927 "Invalid Synthetic field attribute length %u in class file %s", 928 attribute_length, CHECK); 929 } 930 is_synthetic = true; 931 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 932 if (attribute_length != 0) { 933 classfile_parse_error( 934 "Invalid Deprecated field attribute length %u in class file %s", 935 attribute_length, CHECK); 936 } 937 } else if (_major_version >= JAVA_1_5_VERSION) { 938 if (attribute_name == vmSymbols::tag_signature()) { 939 if (attribute_length != 2) { 940 classfile_parse_error( 941 "Wrong size %u for field's Signature attribute in class file %s", 942 attribute_length, CHECK); 943 } 944 generic_signature_index = parse_generic_signature_attribute(CHECK); 945 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 946 runtime_visible_annotations_length = attribute_length; 947 runtime_visible_annotations = cfs->get_u1_buffer(); 948 assert(runtime_visible_annotations != NULL, "null visible annotations"); 949 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 950 parse_annotations(runtime_visible_annotations, 951 runtime_visible_annotations_length, 952 parsed_annotations, 953 CHECK); 954 cfs->skip_u1_fast(runtime_visible_annotations_length); 955 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 956 runtime_invisible_annotations_length = attribute_length; 957 runtime_invisible_annotations = cfs->get_u1_buffer(); 958 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 959 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 960 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 961 if (runtime_visible_type_annotations != NULL) { 962 classfile_parse_error( 963 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 964 } 965 runtime_visible_type_annotations_length = attribute_length; 966 runtime_visible_type_annotations = cfs->get_u1_buffer(); 967 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 968 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 969 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 970 if (runtime_invisible_type_annotations_exists) { 971 classfile_parse_error( 972 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 973 } else { 974 runtime_invisible_type_annotations_exists = true; 975 } 976 if (PreserveAllAnnotations) { 977 runtime_invisible_type_annotations_length = attribute_length; 978 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 979 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 980 } 981 cfs->skip_u1(attribute_length, CHECK); 982 } else { 983 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 984 } 985 } else { 986 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 987 } 988 } 989 990 *constantvalue_index_addr = constantvalue_index; 991 *is_synthetic_addr = is_synthetic; 992 *generic_signature_index_addr = generic_signature_index; 993 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 994 runtime_visible_annotations_length, 995 runtime_invisible_annotations, 996 runtime_invisible_annotations_length, 997 CHECK); 998 parsed_annotations->set_field_annotations(a); 999 a = assemble_annotations(runtime_visible_type_annotations, 1000 runtime_visible_type_annotations_length, 1001 runtime_invisible_type_annotations, 1002 runtime_invisible_type_annotations_length, 1003 CHECK); 1004 parsed_annotations->set_field_type_annotations(a); 1005 return; 1006 } 1007 1008 1009 // Field allocation types. Used for computing field offsets. 1010 1011 enum FieldAllocationType { 1012 STATIC_OOP, // Oops 1013 STATIC_BYTE, // Boolean, Byte, char 1014 STATIC_SHORT, // shorts 1015 STATIC_WORD, // ints 1016 STATIC_DOUBLE, // aligned long or double 1017 NONSTATIC_OOP, 1018 NONSTATIC_BYTE, 1019 NONSTATIC_SHORT, 1020 NONSTATIC_WORD, 1021 NONSTATIC_DOUBLE, 1022 MAX_FIELD_ALLOCATION_TYPE, 1023 BAD_ALLOCATION_TYPE = -1 1024 }; 1025 1026 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1027 BAD_ALLOCATION_TYPE, // 0 1028 BAD_ALLOCATION_TYPE, // 1 1029 BAD_ALLOCATION_TYPE, // 2 1030 BAD_ALLOCATION_TYPE, // 3 1031 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1032 NONSTATIC_SHORT, // T_CHAR = 5, 1033 NONSTATIC_WORD, // T_FLOAT = 6, 1034 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1035 NONSTATIC_BYTE, // T_BYTE = 8, 1036 NONSTATIC_SHORT, // T_SHORT = 9, 1037 NONSTATIC_WORD, // T_INT = 10, 1038 NONSTATIC_DOUBLE, // T_LONG = 11, 1039 NONSTATIC_OOP, // T_OBJECT = 12, 1040 NONSTATIC_OOP, // T_ARRAY = 13, 1041 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1042 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1043 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1044 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1045 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1046 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1047 BAD_ALLOCATION_TYPE, // 0 1048 BAD_ALLOCATION_TYPE, // 1 1049 BAD_ALLOCATION_TYPE, // 2 1050 BAD_ALLOCATION_TYPE, // 3 1051 STATIC_BYTE , // T_BOOLEAN = 4, 1052 STATIC_SHORT, // T_CHAR = 5, 1053 STATIC_WORD, // T_FLOAT = 6, 1054 STATIC_DOUBLE, // T_DOUBLE = 7, 1055 STATIC_BYTE, // T_BYTE = 8, 1056 STATIC_SHORT, // T_SHORT = 9, 1057 STATIC_WORD, // T_INT = 10, 1058 STATIC_DOUBLE, // T_LONG = 11, 1059 STATIC_OOP, // T_OBJECT = 12, 1060 STATIC_OOP, // T_ARRAY = 13, 1061 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1062 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1063 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1064 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1065 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1066 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1067 }; 1068 1069 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1070 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1071 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1072 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1073 return result; 1074 } 1075 1076 class FieldAllocationCount: public ResourceObj { 1077 public: 1078 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1079 1080 FieldAllocationCount() { 1081 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1082 count[i] = 0; 1083 } 1084 } 1085 1086 FieldAllocationType update(bool is_static, BasicType type) { 1087 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1088 // Make sure there is no overflow with injected fields. 1089 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1090 count[atype]++; 1091 return atype; 1092 } 1093 }; 1094 1095 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1096 bool is_interface, 1097 FieldAllocationCount *fac, 1098 u2* java_fields_count_ptr, TRAPS) { 1099 ClassFileStream* cfs = stream(); 1100 cfs->guarantee_more(2, CHECK_NULL); // length 1101 u2 length = cfs->get_u2_fast(); 1102 *java_fields_count_ptr = length; 1103 1104 int num_injected = 0; 1105 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1106 int total_fields = length + num_injected; 1107 1108 // The field array starts with tuples of shorts 1109 // [access, name index, sig index, initial value index, byte offset]. 1110 // A generic signature slot only exists for field with generic 1111 // signature attribute. And the access flag is set with 1112 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1113 // signature slots are at the end of the field array and after all 1114 // other fields data. 1115 // 1116 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1117 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1118 // ... 1119 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1120 // [generic signature index] 1121 // [generic signature index] 1122 // ... 1123 // 1124 // Allocate a temporary resource array for field data. For each field, 1125 // a slot is reserved in the temporary array for the generic signature 1126 // index. After parsing all fields, the data are copied to a permanent 1127 // array and any unused slots will be discarded. 1128 ResourceMark rm(THREAD); 1129 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1130 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1131 1132 // The generic signature slots start after all other fields' data. 1133 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1134 int num_generic_signature = 0; 1135 for (int n = 0; n < length; n++) { 1136 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1137 1138 AccessFlags access_flags; 1139 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1140 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1141 access_flags.set_flags(flags); 1142 1143 u2 name_index = cfs->get_u2_fast(); 1144 int cp_size = _cp->length(); 1145 check_property(valid_symbol_at(name_index), 1146 "Invalid constant pool index %u for field name in class file %s", 1147 name_index, 1148 CHECK_NULL); 1149 Symbol* name = _cp->symbol_at(name_index); 1150 verify_legal_field_name(name, CHECK_NULL); 1151 1152 u2 signature_index = cfs->get_u2_fast(); 1153 check_property(valid_symbol_at(signature_index), 1154 "Invalid constant pool index %u for field signature in class file %s", 1155 signature_index, CHECK_NULL); 1156 Symbol* sig = _cp->symbol_at(signature_index); 1157 verify_legal_field_signature(name, sig, CHECK_NULL); 1158 1159 u2 constantvalue_index = 0; 1160 bool is_synthetic = false; 1161 u2 generic_signature_index = 0; 1162 bool is_static = access_flags.is_static(); 1163 FieldAnnotationCollector parsed_annotations(_loader_data); 1164 1165 u2 attributes_count = cfs->get_u2_fast(); 1166 if (attributes_count > 0) { 1167 parse_field_attributes(attributes_count, is_static, signature_index, 1168 &constantvalue_index, &is_synthetic, 1169 &generic_signature_index, &parsed_annotations, 1170 CHECK_NULL); 1171 if (parsed_annotations.field_annotations() != NULL) { 1172 if (_fields_annotations == NULL) { 1173 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1174 _loader_data, length, NULL, 1175 CHECK_NULL); 1176 } 1177 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1178 parsed_annotations.set_field_annotations(NULL); 1179 } 1180 if (parsed_annotations.field_type_annotations() != NULL) { 1181 if (_fields_type_annotations == NULL) { 1182 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1183 _loader_data, length, NULL, 1184 CHECK_NULL); 1185 } 1186 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1187 parsed_annotations.set_field_type_annotations(NULL); 1188 } 1189 1190 if (is_synthetic) { 1191 access_flags.set_is_synthetic(); 1192 } 1193 if (generic_signature_index != 0) { 1194 access_flags.set_field_has_generic_signature(); 1195 fa[generic_signature_slot] = generic_signature_index; 1196 generic_signature_slot ++; 1197 num_generic_signature ++; 1198 } 1199 } 1200 1201 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1202 field->initialize(access_flags.as_short(), 1203 name_index, 1204 signature_index, 1205 constantvalue_index); 1206 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1207 1208 // Remember how many oops we encountered and compute allocation type 1209 FieldAllocationType atype = fac->update(is_static, type); 1210 field->set_allocation_type(atype); 1211 1212 // After field is initialized with type, we can augment it with aux info 1213 if (parsed_annotations.has_any_annotations()) 1214 parsed_annotations.apply_to(field); 1215 } 1216 1217 int index = length; 1218 if (num_injected != 0) { 1219 for (int n = 0; n < num_injected; n++) { 1220 // Check for duplicates 1221 if (injected[n].may_be_java) { 1222 Symbol* name = injected[n].name(); 1223 Symbol* signature = injected[n].signature(); 1224 bool duplicate = false; 1225 for (int i = 0; i < length; i++) { 1226 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1227 if (name == _cp->symbol_at(f->name_index()) && 1228 signature == _cp->symbol_at(f->signature_index())) { 1229 // Symbol is desclared in Java so skip this one 1230 duplicate = true; 1231 break; 1232 } 1233 } 1234 if (duplicate) { 1235 // These will be removed from the field array at the end 1236 continue; 1237 } 1238 } 1239 1240 // Injected field 1241 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1242 field->initialize(JVM_ACC_FIELD_INTERNAL, 1243 injected[n].name_index, 1244 injected[n].signature_index, 1245 0); 1246 1247 BasicType type = FieldType::basic_type(injected[n].signature()); 1248 1249 // Remember how many oops we encountered and compute allocation type 1250 FieldAllocationType atype = fac->update(false, type); 1251 field->set_allocation_type(atype); 1252 index++; 1253 } 1254 } 1255 1256 // Now copy the fields' data from the temporary resource array. 1257 // Sometimes injected fields already exist in the Java source so 1258 // the fields array could be too long. In that case the 1259 // fields array is trimed. Also unused slots that were reserved 1260 // for generic signature indexes are discarded. 1261 Array<u2>* fields = MetadataFactory::new_array<u2>( 1262 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1263 CHECK_NULL); 1264 _fields = fields; // save in case of error 1265 { 1266 int i = 0; 1267 for (; i < index * FieldInfo::field_slots; i++) { 1268 fields->at_put(i, fa[i]); 1269 } 1270 for (int j = total_fields * FieldInfo::field_slots; 1271 j < generic_signature_slot; j++) { 1272 fields->at_put(i++, fa[j]); 1273 } 1274 assert(i == fields->length(), ""); 1275 } 1276 1277 if (_need_verify && length > 1) { 1278 // Check duplicated fields 1279 ResourceMark rm(THREAD); 1280 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1281 THREAD, NameSigHash*, HASH_ROW_SIZE); 1282 initialize_hashtable(names_and_sigs); 1283 bool dup = false; 1284 Symbol* name = NULL; 1285 Symbol* sig = NULL; 1286 { 1287 debug_only(No_Safepoint_Verifier nsv;) 1288 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1289 name = fs.name(); 1290 sig = fs.signature(); 1291 // If no duplicates, add name/signature in hashtable names_and_sigs. 1292 if (!put_after_lookup(name, sig, names_and_sigs)) { 1293 dup = true; 1294 break; 1295 } 1296 } 1297 } 1298 if (dup) { 1299 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", 1300 name->as_C_string(), sig->as_klass_external_name(), CHECK_NULL); 1301 } 1302 } 1303 1304 return fields; 1305 } 1306 1307 1308 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1309 while (length-- > 0) { 1310 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1311 } 1312 } 1313 1314 1315 u2* ClassFileParser::parse_exception_table(u4 code_length, 1316 u4 exception_table_length, 1317 TRAPS) { 1318 ClassFileStream* cfs = stream(); 1319 1320 u2* exception_table_start = cfs->get_u2_buffer(); 1321 assert(exception_table_start != NULL, "null exception table"); 1322 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1323 // Will check legal target after parsing code array in verifier. 1324 if (_need_verify) { 1325 for (unsigned int i = 0; i < exception_table_length; i++) { 1326 u2 start_pc = cfs->get_u2_fast(); 1327 u2 end_pc = cfs->get_u2_fast(); 1328 u2 handler_pc = cfs->get_u2_fast(); 1329 u2 catch_type_index = cfs->get_u2_fast(); 1330 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1331 "Illegal exception table range in class file %s", 1332 CHECK_NULL); 1333 guarantee_property(handler_pc < code_length, 1334 "Illegal exception table handler in class file %s", 1335 CHECK_NULL); 1336 if (catch_type_index != 0) { 1337 guarantee_property(valid_klass_reference_at(catch_type_index), 1338 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1339 } 1340 } 1341 } else { 1342 cfs->skip_u2_fast(exception_table_length * 4); 1343 } 1344 return exception_table_start; 1345 } 1346 1347 void ClassFileParser::parse_linenumber_table( 1348 u4 code_attribute_length, u4 code_length, 1349 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1350 ClassFileStream* cfs = stream(); 1351 unsigned int num_entries = cfs->get_u2(CHECK); 1352 1353 // Each entry is a u2 start_pc, and a u2 line_number 1354 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1355 1356 // Verify line number attribute and table length 1357 check_property( 1358 code_attribute_length == sizeof(u2) + length_in_bytes, 1359 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1360 1361 cfs->guarantee_more(length_in_bytes, CHECK); 1362 1363 if ((*write_stream) == NULL) { 1364 if (length_in_bytes > fixed_buffer_size) { 1365 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1366 } else { 1367 (*write_stream) = new CompressedLineNumberWriteStream( 1368 linenumbertable_buffer, fixed_buffer_size); 1369 } 1370 } 1371 1372 while (num_entries-- > 0) { 1373 u2 bci = cfs->get_u2_fast(); // start_pc 1374 u2 line = cfs->get_u2_fast(); // line_number 1375 guarantee_property(bci < code_length, 1376 "Invalid pc in LineNumberTable in class file %s", CHECK); 1377 (*write_stream)->write_pair(bci, line); 1378 } 1379 } 1380 1381 1382 // Class file LocalVariableTable elements. 1383 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1384 public: 1385 u2 start_bci; 1386 u2 length; 1387 u2 name_cp_index; 1388 u2 descriptor_cp_index; 1389 u2 slot; 1390 }; 1391 1392 1393 class LVT_Hash: public CHeapObj<mtClass> { 1394 public: 1395 LocalVariableTableElement *_elem; // element 1396 LVT_Hash* _next; // Next entry in hash table 1397 }; 1398 1399 unsigned int hash(LocalVariableTableElement *elem) { 1400 unsigned int raw_hash = elem->start_bci; 1401 1402 raw_hash = elem->length + raw_hash * 37; 1403 raw_hash = elem->name_cp_index + raw_hash * 37; 1404 raw_hash = elem->slot + raw_hash * 37; 1405 1406 return raw_hash % HASH_ROW_SIZE; 1407 } 1408 1409 void initialize_hashtable(LVT_Hash** table) { 1410 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1411 table[i] = NULL; 1412 } 1413 } 1414 1415 void clear_hashtable(LVT_Hash** table) { 1416 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1417 LVT_Hash* current = table[i]; 1418 LVT_Hash* next; 1419 while (current != NULL) { 1420 next = current->_next; 1421 current->_next = NULL; 1422 delete(current); 1423 current = next; 1424 } 1425 table[i] = NULL; 1426 } 1427 } 1428 1429 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1430 LVT_Hash* entry = table[index]; 1431 1432 /* 1433 * 3-tuple start_bci/length/slot has to be unique key, 1434 * so the following comparison seems to be redundant: 1435 * && elem->name_cp_index == entry->_elem->name_cp_index 1436 */ 1437 while (entry != NULL) { 1438 if (elem->start_bci == entry->_elem->start_bci 1439 && elem->length == entry->_elem->length 1440 && elem->name_cp_index == entry->_elem->name_cp_index 1441 && elem->slot == entry->_elem->slot 1442 ) { 1443 return entry; 1444 } 1445 entry = entry->_next; 1446 } 1447 return NULL; 1448 } 1449 1450 // Return false if the local variable is found in table. 1451 // Return true if no duplicate is found. 1452 // And local variable is added as a new entry in table. 1453 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1454 // First lookup for duplicates 1455 int index = hash(elem); 1456 LVT_Hash* entry = LVT_lookup(elem, index, table); 1457 1458 if (entry != NULL) { 1459 return false; 1460 } 1461 // No duplicate is found, allocate a new entry and fill it. 1462 if ((entry = new LVT_Hash()) == NULL) { 1463 return false; 1464 } 1465 entry->_elem = elem; 1466 1467 // Insert into hash table 1468 entry->_next = table[index]; 1469 table[index] = entry; 1470 1471 return true; 1472 } 1473 1474 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1475 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1476 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1477 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1478 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1479 lvt->signature_cp_index = 0; 1480 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1481 } 1482 1483 // Function is used to parse both attributes: 1484 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1485 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1486 u2 max_locals, 1487 u4 code_attribute_length, 1488 u2* localvariable_table_length, 1489 bool isLVTT, 1490 TRAPS) { 1491 ClassFileStream* cfs = stream(); 1492 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1493 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1494 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1495 // Verify local variable table attribute has right length 1496 if (_need_verify) { 1497 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1498 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1499 } 1500 u2* localvariable_table_start = cfs->get_u2_buffer(); 1501 assert(localvariable_table_start != NULL, "null local variable table"); 1502 if (!_need_verify) { 1503 cfs->skip_u2_fast(size); 1504 } else { 1505 cfs->guarantee_more(size * 2, CHECK_NULL); 1506 for(int i = 0; i < (*localvariable_table_length); i++) { 1507 u2 start_pc = cfs->get_u2_fast(); 1508 u2 length = cfs->get_u2_fast(); 1509 u2 name_index = cfs->get_u2_fast(); 1510 u2 descriptor_index = cfs->get_u2_fast(); 1511 u2 index = cfs->get_u2_fast(); 1512 // Assign to a u4 to avoid overflow 1513 u4 end_pc = (u4)start_pc + (u4)length; 1514 1515 if (start_pc >= code_length) { 1516 classfile_parse_error( 1517 "Invalid start_pc %u in %s in class file %s", 1518 start_pc, tbl_name, CHECK_NULL); 1519 } 1520 if (end_pc > code_length) { 1521 classfile_parse_error( 1522 "Invalid length %u in %s in class file %s", 1523 length, tbl_name, CHECK_NULL); 1524 } 1525 int cp_size = _cp->length(); 1526 guarantee_property(valid_symbol_at(name_index), 1527 "Name index %u in %s has bad constant type in class file %s", 1528 name_index, tbl_name, CHECK_NULL); 1529 guarantee_property(valid_symbol_at(descriptor_index), 1530 "Signature index %u in %s has bad constant type in class file %s", 1531 descriptor_index, tbl_name, CHECK_NULL); 1532 1533 Symbol* name = _cp->symbol_at(name_index); 1534 Symbol* sig = _cp->symbol_at(descriptor_index); 1535 verify_legal_field_name(name, CHECK_NULL); 1536 u2 extra_slot = 0; 1537 if (!isLVTT) { 1538 verify_legal_field_signature(name, sig, CHECK_NULL); 1539 1540 // 4894874: check special cases for double and long local variables 1541 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1542 sig == vmSymbols::type_signature(T_LONG)) { 1543 extra_slot = 1; 1544 } 1545 } 1546 guarantee_property((index + extra_slot) < max_locals, 1547 "Invalid index %u in %s in class file %s", 1548 index, tbl_name, CHECK_NULL); 1549 } 1550 } 1551 return localvariable_table_start; 1552 } 1553 1554 1555 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1556 u1* u1_array, u2* u2_array, TRAPS) { 1557 ClassFileStream* cfs = stream(); 1558 u2 index = 0; // index in the array with long/double occupying two slots 1559 u4 i1 = *u1_index; 1560 u4 i2 = *u2_index + 1; 1561 for(int i = 0; i < array_length; i++) { 1562 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1563 index++; 1564 if (tag == ITEM_Long || tag == ITEM_Double) { 1565 index++; 1566 } else if (tag == ITEM_Object) { 1567 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1568 guarantee_property(valid_klass_reference_at(class_index), 1569 "Bad class index %u in StackMap in class file %s", 1570 class_index, CHECK); 1571 } else if (tag == ITEM_Uninitialized) { 1572 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1573 guarantee_property( 1574 offset < code_length, 1575 "Bad uninitialized type offset %u in StackMap in class file %s", 1576 offset, CHECK); 1577 } else { 1578 guarantee_property( 1579 tag <= (u1)ITEM_Uninitialized, 1580 "Unknown variable type %u in StackMap in class file %s", 1581 tag, CHECK); 1582 } 1583 } 1584 u2_array[*u2_index] = index; 1585 *u1_index = i1; 1586 *u2_index = i2; 1587 } 1588 1589 u1* ClassFileParser::parse_stackmap_table( 1590 u4 code_attribute_length, TRAPS) { 1591 if (code_attribute_length == 0) 1592 return NULL; 1593 1594 ClassFileStream* cfs = stream(); 1595 u1* stackmap_table_start = cfs->get_u1_buffer(); 1596 assert(stackmap_table_start != NULL, "null stackmap table"); 1597 1598 // check code_attribute_length first 1599 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1600 1601 if (!_need_verify && !DumpSharedSpaces) { 1602 return NULL; 1603 } 1604 return stackmap_table_start; 1605 } 1606 1607 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1608 u4 method_attribute_length, 1609 TRAPS) { 1610 ClassFileStream* cfs = stream(); 1611 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1612 *checked_exceptions_length = cfs->get_u2_fast(); 1613 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1614 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1615 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1616 if (!_need_verify) { 1617 cfs->skip_u2_fast(size); 1618 } else { 1619 // Verify each value in the checked exception table 1620 u2 checked_exception; 1621 u2 len = *checked_exceptions_length; 1622 cfs->guarantee_more(2 * len, CHECK_NULL); 1623 for (int i = 0; i < len; i++) { 1624 checked_exception = cfs->get_u2_fast(); 1625 check_property( 1626 valid_klass_reference_at(checked_exception), 1627 "Exception name has bad type at constant pool %u in class file %s", 1628 checked_exception, CHECK_NULL); 1629 } 1630 } 1631 // check exceptions attribute length 1632 if (_need_verify) { 1633 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1634 sizeof(u2) * size), 1635 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1636 } 1637 return checked_exceptions_start; 1638 } 1639 1640 void ClassFileParser::throwIllegalSignature( 1641 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1642 ResourceMark rm(THREAD); 1643 Exceptions::fthrow(THREAD_AND_LOCATION, 1644 vmSymbols::java_lang_ClassFormatError(), 1645 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1646 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1647 } 1648 1649 // Skip an annotation. Return >=limit if there is any problem. 1650 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1651 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1652 // value := switch (tag:u1) { ... } 1653 index += 2; // skip atype 1654 if ((index += 2) >= limit) return limit; // read nmem 1655 int nmem = Bytes::get_Java_u2(buffer+index-2); 1656 while (--nmem >= 0 && index < limit) { 1657 index += 2; // skip member 1658 index = skip_annotation_value(buffer, limit, index); 1659 } 1660 return index; 1661 } 1662 1663 // Safely increment index by val if does not pass limit 1664 #define SAFE_ADD(index, limit, val) \ 1665 if (index >= limit - val) return limit; \ 1666 index += val; 1667 1668 // Skip an annotation value. Return >=limit if there is any problem. 1669 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1670 // value := switch (tag:u1) { 1671 // case B, C, I, S, Z, D, F, J, c: con:u2; 1672 // case e: e_class:u2 e_name:u2; 1673 // case s: s_con:u2; 1674 // case [: do(nval:u2) {value}; 1675 // case @: annotation; 1676 // case s: s_con:u2; 1677 // } 1678 SAFE_ADD(index, limit, 1); // read tag 1679 u1 tag = buffer[index-1]; 1680 switch (tag) { 1681 case 'B': case 'C': case 'I': case 'S': case 'Z': 1682 case 'D': case 'F': case 'J': case 'c': case 's': 1683 SAFE_ADD(index, limit, 2); // skip con or s_con 1684 break; 1685 case 'e': 1686 SAFE_ADD(index, limit, 4); // skip e_class, e_name 1687 break; 1688 case '[': 1689 { 1690 SAFE_ADD(index, limit, 2); // read nval 1691 int nval = Bytes::get_Java_u2(buffer+index-2); 1692 while (--nval >= 0 && index < limit) { 1693 index = skip_annotation_value(buffer, limit, index); 1694 } 1695 } 1696 break; 1697 case '@': 1698 index = skip_annotation(buffer, limit, index); 1699 break; 1700 default: 1701 assert(false, "annotation tag"); 1702 return limit; // bad tag byte 1703 } 1704 return index; 1705 } 1706 1707 // Sift through annotations, looking for those significant to the VM: 1708 void ClassFileParser::parse_annotations(u1* buffer, int limit, 1709 ClassFileParser::AnnotationCollector* coll, 1710 TRAPS) { 1711 // annotations := do(nann:u2) {annotation} 1712 int index = 2; 1713 if (index >= limit) return; // read nann 1714 int nann = Bytes::get_Java_u2(buffer+index-2); 1715 enum { // initial annotation layout 1716 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1717 count_off = 2, // u2 such as 1 (one value) 1718 member_off = 4, // utf8 such as 'value' 1719 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1720 e_tag_val = 'e', 1721 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1722 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1723 e_size = 11, // end of 'e' annotation 1724 c_tag_val = 'c', // payload is type 1725 c_con_off = 7, // utf8 payload, such as 'I' 1726 c_size = 9, // end of 'c' annotation 1727 s_tag_val = 's', // payload is String 1728 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1729 s_size = 9, 1730 min_size = 6 // smallest possible size (zero members) 1731 }; 1732 // Cannot add min_size to index in case of overflow MAX_INT 1733 while ((--nann) >= 0 && (index-2 <= limit - min_size)) { 1734 int index0 = index; 1735 index = skip_annotation(buffer, limit, index); 1736 u1* abase = buffer + index0; 1737 int atype = Bytes::get_Java_u2(abase + atype_off); 1738 int count = Bytes::get_Java_u2(abase + count_off); 1739 Symbol* aname = check_symbol_at(_cp, atype); 1740 if (aname == NULL) break; // invalid annotation name 1741 Symbol* member = NULL; 1742 if (count >= 1) { 1743 int member_index = Bytes::get_Java_u2(abase + member_off); 1744 member = check_symbol_at(_cp, member_index); 1745 if (member == NULL) break; // invalid member name 1746 } 1747 1748 // Here is where parsing particular annotations will take place. 1749 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1750 if (id == AnnotationCollector::_unknown) continue; 1751 coll->set_annotation(id); 1752 1753 if (id == AnnotationCollector::_sun_misc_Contended) { 1754 // @Contended can optionally specify the contention group. 1755 // 1756 // Contended group defines the equivalence class over the fields: 1757 // the fields within the same contended group are not treated distinct. 1758 // The only exception is default group, which does not incur the 1759 // equivalence. Naturally, contention group for classes is meaningless. 1760 // 1761 // While the contention group is specified as String, annotation 1762 // values are already interned, and we might as well use the constant 1763 // pool index as the group tag. 1764 // 1765 u2 group_index = 0; // default contended group 1766 if (count == 1 1767 && s_size == (index - index0) // match size 1768 && s_tag_val == *(abase + tag_off) 1769 && member == vmSymbols::value_name()) { 1770 group_index = Bytes::get_Java_u2(abase + s_con_off); 1771 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1772 group_index = 0; // default contended group 1773 } 1774 } 1775 coll->set_contended_group(group_index); 1776 } 1777 } 1778 } 1779 1780 ClassFileParser::AnnotationCollector::ID 1781 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1782 Symbol* name) { 1783 vmSymbols::SID sid = vmSymbols::find_sid(name); 1784 // Privileged code can use all annotations. Other code silently drops some. 1785 const bool privileged = loader_data->is_the_null_class_loader_data() || 1786 loader_data->is_ext_class_loader_data() || 1787 loader_data->is_anonymous(); 1788 switch (sid) { 1789 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1790 if (_location != _in_method) break; // only allow for methods 1791 if (!privileged) break; // only allow in privileged code 1792 return _method_CallerSensitive; 1793 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1794 if (_location != _in_method) break; // only allow for methods 1795 if (!privileged) break; // only allow in privileged code 1796 return _method_ForceInline; 1797 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1798 if (_location != _in_method) break; // only allow for methods 1799 if (!privileged) break; // only allow in privileged code 1800 return _method_DontInline; 1801 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): 1802 if (_location != _in_method) break; // only allow for methods 1803 if (!privileged) break; // only allow in privileged code 1804 return _method_InjectedProfile; 1805 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1806 if (_location != _in_method) break; // only allow for methods 1807 if (!privileged) break; // only allow in privileged code 1808 return _method_LambdaForm_Compiled; 1809 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1810 if (_location != _in_method) break; // only allow for methods 1811 if (!privileged) break; // only allow in privileged code 1812 return _method_LambdaForm_Hidden; 1813 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): 1814 if (_location != _in_field) break; // only allow for fields 1815 if (!privileged) break; // only allow in privileged code 1816 return _field_Stable; 1817 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1818 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1819 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1820 return _sun_misc_Contended; 1821 default: break; 1822 } 1823 return AnnotationCollector::_unknown; 1824 } 1825 1826 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1827 if (is_contended()) 1828 f->set_contended_group(contended_group()); 1829 if (is_stable()) 1830 f->set_stable(true); 1831 } 1832 1833 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1834 // If there's an error deallocate metadata for field annotations 1835 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1836 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1837 } 1838 1839 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1840 if (has_annotation(_method_CallerSensitive)) 1841 m->set_caller_sensitive(true); 1842 if (has_annotation(_method_ForceInline)) 1843 m->set_force_inline(true); 1844 if (has_annotation(_method_DontInline)) 1845 m->set_dont_inline(true); 1846 if (has_annotation(_method_InjectedProfile)) 1847 m->set_has_injected_profile(true); 1848 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1849 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1850 if (has_annotation(_method_LambdaForm_Hidden)) 1851 m->set_hidden(true); 1852 } 1853 1854 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1855 k->set_is_contended(is_contended()); 1856 } 1857 1858 1859 #define MAX_ARGS_SIZE 255 1860 #define MAX_CODE_SIZE 65535 1861 #define INITIAL_MAX_LVT_NUMBER 256 1862 1863 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1864 * 1865 * Rules for LVT's and LVTT's are: 1866 * - There can be any number of LVT's and LVTT's. 1867 * - If there are n LVT's, it is the same as if there was just 1868 * one LVT containing all the entries from the n LVT's. 1869 * - There may be no more than one LVT entry per local variable. 1870 * Two LVT entries are 'equal' if these fields are the same: 1871 * start_pc, length, name, slot 1872 * - There may be no more than one LVTT entry per each LVT entry. 1873 * Each LVTT entry has to match some LVT entry. 1874 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1875 */ 1876 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1877 int lvt_cnt, 1878 u2* localvariable_table_length, 1879 u2** localvariable_table_start, 1880 int lvtt_cnt, 1881 u2* localvariable_type_table_length, 1882 u2** localvariable_type_table_start, 1883 TRAPS) { 1884 1885 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1886 initialize_hashtable(lvt_Hash); 1887 1888 // To fill LocalVariableTable in 1889 Classfile_LVT_Element* cf_lvt; 1890 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1891 1892 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1893 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1894 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1895 copy_lvt_element(&cf_lvt[idx], lvt); 1896 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1897 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1898 && _need_verify 1899 && _major_version >= JAVA_1_5_VERSION) { 1900 clear_hashtable(lvt_Hash); 1901 classfile_parse_error("Duplicated LocalVariableTable attribute " 1902 "entry for '%s' in class file %s", 1903 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1904 CHECK); 1905 } 1906 } 1907 } 1908 1909 // To merge LocalVariableTable and LocalVariableTypeTable 1910 Classfile_LVT_Element* cf_lvtt; 1911 LocalVariableTableElement lvtt_elem; 1912 1913 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1914 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1915 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1916 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1917 int index = hash(&lvtt_elem); 1918 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1919 if (entry == NULL) { 1920 if (_need_verify) { 1921 clear_hashtable(lvt_Hash); 1922 classfile_parse_error("LVTT entry for '%s' in class file %s " 1923 "does not match any LVT entry", 1924 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1925 CHECK); 1926 } 1927 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1928 clear_hashtable(lvt_Hash); 1929 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1930 "entry for '%s' in class file %s", 1931 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1932 CHECK); 1933 } else { 1934 // to add generic signatures into LocalVariableTable 1935 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1936 } 1937 } 1938 } 1939 clear_hashtable(lvt_Hash); 1940 } 1941 1942 1943 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1944 u1* runtime_visible_annotations, 1945 int runtime_visible_annotations_length, 1946 u1* runtime_invisible_annotations, 1947 int runtime_invisible_annotations_length, 1948 u1* runtime_visible_parameter_annotations, 1949 int runtime_visible_parameter_annotations_length, 1950 u1* runtime_invisible_parameter_annotations, 1951 int runtime_invisible_parameter_annotations_length, 1952 u1* runtime_visible_type_annotations, 1953 int runtime_visible_type_annotations_length, 1954 u1* runtime_invisible_type_annotations, 1955 int runtime_invisible_type_annotations_length, 1956 u1* annotation_default, 1957 int annotation_default_length, 1958 TRAPS) { 1959 1960 AnnotationArray* a; 1961 1962 if (runtime_visible_annotations_length + 1963 runtime_invisible_annotations_length > 0) { 1964 a = assemble_annotations(runtime_visible_annotations, 1965 runtime_visible_annotations_length, 1966 runtime_invisible_annotations, 1967 runtime_invisible_annotations_length, 1968 CHECK); 1969 cm->set_method_annotations(a); 1970 } 1971 1972 if (runtime_visible_parameter_annotations_length + 1973 runtime_invisible_parameter_annotations_length > 0) { 1974 a = assemble_annotations(runtime_visible_parameter_annotations, 1975 runtime_visible_parameter_annotations_length, 1976 runtime_invisible_parameter_annotations, 1977 runtime_invisible_parameter_annotations_length, 1978 CHECK); 1979 cm->set_parameter_annotations(a); 1980 } 1981 1982 if (annotation_default_length > 0) { 1983 a = assemble_annotations(annotation_default, 1984 annotation_default_length, 1985 NULL, 1986 0, 1987 CHECK); 1988 cm->set_default_annotations(a); 1989 } 1990 1991 if (runtime_visible_type_annotations_length + 1992 runtime_invisible_type_annotations_length > 0) { 1993 a = assemble_annotations(runtime_visible_type_annotations, 1994 runtime_visible_type_annotations_length, 1995 runtime_invisible_type_annotations, 1996 runtime_invisible_type_annotations_length, 1997 CHECK); 1998 cm->set_type_annotations(a); 1999 } 2000 } 2001 2002 2003 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 2004 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 2005 // Method* to save footprint, so we only know the size of the resulting Method* when the 2006 // entire method attribute is parsed. 2007 // 2008 // The promoted_flags parameter is used to pass relevant access_flags 2009 // from the method back up to the containing klass. These flag values 2010 // are added to klass's access_flags. 2011 2012 methodHandle ClassFileParser::parse_method(bool is_interface, 2013 AccessFlags *promoted_flags, 2014 TRAPS) { 2015 ClassFileStream* cfs = stream(); 2016 methodHandle nullHandle; 2017 ResourceMark rm(THREAD); 2018 // Parse fixed parts 2019 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 2020 2021 int flags = cfs->get_u2_fast(); 2022 u2 name_index = cfs->get_u2_fast(); 2023 int cp_size = _cp->length(); 2024 check_property( 2025 valid_symbol_at(name_index), 2026 "Illegal constant pool index %u for method name in class file %s", 2027 name_index, CHECK_(nullHandle)); 2028 Symbol* name = _cp->symbol_at(name_index); 2029 verify_legal_method_name(name, CHECK_(nullHandle)); 2030 2031 u2 signature_index = cfs->get_u2_fast(); 2032 guarantee_property( 2033 valid_symbol_at(signature_index), 2034 "Illegal constant pool index %u for method signature in class file %s", 2035 signature_index, CHECK_(nullHandle)); 2036 Symbol* signature = _cp->symbol_at(signature_index); 2037 2038 AccessFlags access_flags; 2039 if (name == vmSymbols::class_initializer_name()) { 2040 // We ignore the other access flags for a valid class initializer. 2041 // (JVM Spec 2nd ed., chapter 4.6) 2042 if (_major_version < 51) { // backward compatibility 2043 flags = JVM_ACC_STATIC; 2044 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2045 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2046 } 2047 } else { 2048 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2049 } 2050 2051 int args_size = -1; // only used when _need_verify is true 2052 if (_need_verify) { 2053 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2054 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2055 if (args_size > MAX_ARGS_SIZE) { 2056 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2057 } 2058 } 2059 2060 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2061 2062 // Default values for code and exceptions attribute elements 2063 u2 max_stack = 0; 2064 u2 max_locals = 0; 2065 u4 code_length = 0; 2066 u1* code_start = 0; 2067 u2 exception_table_length = 0; 2068 u2* exception_table_start = NULL; 2069 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2070 u2 checked_exceptions_length = 0; 2071 u2* checked_exceptions_start = NULL; 2072 CompressedLineNumberWriteStream* linenumber_table = NULL; 2073 int linenumber_table_length = 0; 2074 int total_lvt_length = 0; 2075 u2 lvt_cnt = 0; 2076 u2 lvtt_cnt = 0; 2077 bool lvt_allocated = false; 2078 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2079 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2080 u2* localvariable_table_length; 2081 u2** localvariable_table_start; 2082 u2* localvariable_type_table_length; 2083 u2** localvariable_type_table_start; 2084 u2 method_parameters_length = 0; 2085 u1* method_parameters_data = NULL; 2086 bool method_parameters_seen = false; 2087 bool parsed_code_attribute = false; 2088 bool parsed_checked_exceptions_attribute = false; 2089 bool parsed_stackmap_attribute = false; 2090 // stackmap attribute - JDK1.5 2091 u1* stackmap_data = NULL; 2092 int stackmap_data_length = 0; 2093 u2 generic_signature_index = 0; 2094 MethodAnnotationCollector parsed_annotations; 2095 u1* runtime_visible_annotations = NULL; 2096 int runtime_visible_annotations_length = 0; 2097 u1* runtime_invisible_annotations = NULL; 2098 int runtime_invisible_annotations_length = 0; 2099 u1* runtime_visible_parameter_annotations = NULL; 2100 int runtime_visible_parameter_annotations_length = 0; 2101 u1* runtime_invisible_parameter_annotations = NULL; 2102 int runtime_invisible_parameter_annotations_length = 0; 2103 u1* runtime_visible_type_annotations = NULL; 2104 int runtime_visible_type_annotations_length = 0; 2105 u1* runtime_invisible_type_annotations = NULL; 2106 int runtime_invisible_type_annotations_length = 0; 2107 bool runtime_invisible_type_annotations_exists = false; 2108 u1* annotation_default = NULL; 2109 int annotation_default_length = 0; 2110 2111 // Parse code and exceptions attribute 2112 u2 method_attributes_count = cfs->get_u2_fast(); 2113 while (method_attributes_count--) { 2114 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2115 u2 method_attribute_name_index = cfs->get_u2_fast(); 2116 u4 method_attribute_length = cfs->get_u4_fast(); 2117 check_property( 2118 valid_symbol_at(method_attribute_name_index), 2119 "Invalid method attribute name index %u in class file %s", 2120 method_attribute_name_index, CHECK_(nullHandle)); 2121 2122 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2123 if (method_attribute_name == vmSymbols::tag_code()) { 2124 // Parse Code attribute 2125 if (_need_verify) { 2126 guarantee_property( 2127 !access_flags.is_native() && !access_flags.is_abstract(), 2128 "Code attribute in native or abstract methods in class file %s", 2129 CHECK_(nullHandle)); 2130 } 2131 if (parsed_code_attribute) { 2132 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2133 } 2134 parsed_code_attribute = true; 2135 2136 // Stack size, locals size, and code size 2137 if (_major_version == 45 && _minor_version <= 2) { 2138 cfs->guarantee_more(4, CHECK_(nullHandle)); 2139 max_stack = cfs->get_u1_fast(); 2140 max_locals = cfs->get_u1_fast(); 2141 code_length = cfs->get_u2_fast(); 2142 } else { 2143 cfs->guarantee_more(8, CHECK_(nullHandle)); 2144 max_stack = cfs->get_u2_fast(); 2145 max_locals = cfs->get_u2_fast(); 2146 code_length = cfs->get_u4_fast(); 2147 } 2148 if (_need_verify) { 2149 guarantee_property(args_size <= max_locals, 2150 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2151 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2152 "Invalid method Code length %u in class file %s", 2153 code_length, CHECK_(nullHandle)); 2154 } 2155 // Code pointer 2156 code_start = cfs->get_u1_buffer(); 2157 assert(code_start != NULL, "null code start"); 2158 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2159 cfs->skip_u1_fast(code_length); 2160 2161 // Exception handler table 2162 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2163 exception_table_length = cfs->get_u2_fast(); 2164 if (exception_table_length > 0) { 2165 exception_table_start = 2166 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2167 } 2168 2169 // Parse additional attributes in code attribute 2170 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2171 u2 code_attributes_count = cfs->get_u2_fast(); 2172 2173 unsigned int calculated_attribute_length = 0; 2174 2175 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2176 calculated_attribute_length = 2177 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2178 } else { 2179 // max_stack, locals and length are smaller in pre-version 45.2 classes 2180 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2181 } 2182 calculated_attribute_length += 2183 code_length + 2184 sizeof(exception_table_length) + 2185 sizeof(code_attributes_count) + 2186 exception_table_length * 2187 ( sizeof(u2) + // start_pc 2188 sizeof(u2) + // end_pc 2189 sizeof(u2) + // handler_pc 2190 sizeof(u2) ); // catch_type_index 2191 2192 while (code_attributes_count--) { 2193 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2194 u2 code_attribute_name_index = cfs->get_u2_fast(); 2195 u4 code_attribute_length = cfs->get_u4_fast(); 2196 calculated_attribute_length += code_attribute_length + 2197 sizeof(code_attribute_name_index) + 2198 sizeof(code_attribute_length); 2199 check_property(valid_symbol_at(code_attribute_name_index), 2200 "Invalid code attribute name index %u in class file %s", 2201 code_attribute_name_index, 2202 CHECK_(nullHandle)); 2203 if (LoadLineNumberTables && 2204 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2205 // Parse and compress line number table 2206 parse_linenumber_table(code_attribute_length, code_length, 2207 &linenumber_table, CHECK_(nullHandle)); 2208 2209 } else if (LoadLocalVariableTables && 2210 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2211 // Parse local variable table 2212 if (!lvt_allocated) { 2213 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2214 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2215 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2216 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2217 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2218 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2219 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2220 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2221 lvt_allocated = true; 2222 } 2223 if (lvt_cnt == max_lvt_cnt) { 2224 max_lvt_cnt <<= 1; 2225 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2226 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2227 } 2228 localvariable_table_start[lvt_cnt] = 2229 parse_localvariable_table(code_length, 2230 max_locals, 2231 code_attribute_length, 2232 &localvariable_table_length[lvt_cnt], 2233 false, // is not LVTT 2234 CHECK_(nullHandle)); 2235 total_lvt_length += localvariable_table_length[lvt_cnt]; 2236 lvt_cnt++; 2237 } else if (LoadLocalVariableTypeTables && 2238 _major_version >= JAVA_1_5_VERSION && 2239 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2240 if (!lvt_allocated) { 2241 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2242 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2243 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2244 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2245 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2246 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2247 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2248 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2249 lvt_allocated = true; 2250 } 2251 // Parse local variable type table 2252 if (lvtt_cnt == max_lvtt_cnt) { 2253 max_lvtt_cnt <<= 1; 2254 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2255 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2256 } 2257 localvariable_type_table_start[lvtt_cnt] = 2258 parse_localvariable_table(code_length, 2259 max_locals, 2260 code_attribute_length, 2261 &localvariable_type_table_length[lvtt_cnt], 2262 true, // is LVTT 2263 CHECK_(nullHandle)); 2264 lvtt_cnt++; 2265 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2266 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2267 // Stack map is only needed by the new verifier in JDK1.5. 2268 if (parsed_stackmap_attribute) { 2269 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2270 } 2271 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2272 stackmap_data_length = code_attribute_length; 2273 parsed_stackmap_attribute = true; 2274 } else { 2275 // Skip unknown attributes 2276 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2277 } 2278 } 2279 // check method attribute length 2280 if (_need_verify) { 2281 guarantee_property(method_attribute_length == calculated_attribute_length, 2282 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2283 } 2284 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2285 // Parse Exceptions attribute 2286 if (parsed_checked_exceptions_attribute) { 2287 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2288 } 2289 parsed_checked_exceptions_attribute = true; 2290 checked_exceptions_start = 2291 parse_checked_exceptions(&checked_exceptions_length, 2292 method_attribute_length, 2293 CHECK_(nullHandle)); 2294 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2295 // reject multiple method parameters 2296 if (method_parameters_seen) { 2297 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2298 } 2299 method_parameters_seen = true; 2300 method_parameters_length = cfs->get_u1_fast(); 2301 if (method_attribute_length != (method_parameters_length * 4u) + 1u) { 2302 classfile_parse_error( 2303 "Invalid MethodParameters method attribute length %u in class file", 2304 method_attribute_length, CHECK_(nullHandle)); 2305 } 2306 method_parameters_data = cfs->get_u1_buffer(); 2307 cfs->skip_u2_fast(method_parameters_length); 2308 cfs->skip_u2_fast(method_parameters_length); 2309 // ignore this attribute if it cannot be reflected 2310 if (!SystemDictionary::Parameter_klass_loaded()) 2311 method_parameters_length = 0; 2312 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2313 if (method_attribute_length != 0) { 2314 classfile_parse_error( 2315 "Invalid Synthetic method attribute length %u in class file %s", 2316 method_attribute_length, CHECK_(nullHandle)); 2317 } 2318 // Should we check that there hasn't already been a synthetic attribute? 2319 access_flags.set_is_synthetic(); 2320 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2321 if (method_attribute_length != 0) { 2322 classfile_parse_error( 2323 "Invalid Deprecated method attribute length %u in class file %s", 2324 method_attribute_length, CHECK_(nullHandle)); 2325 } 2326 } else if (_major_version >= JAVA_1_5_VERSION) { 2327 if (method_attribute_name == vmSymbols::tag_signature()) { 2328 if (method_attribute_length != 2) { 2329 classfile_parse_error( 2330 "Invalid Signature attribute length %u in class file %s", 2331 method_attribute_length, CHECK_(nullHandle)); 2332 } 2333 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); 2334 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2335 runtime_visible_annotations_length = method_attribute_length; 2336 runtime_visible_annotations = cfs->get_u1_buffer(); 2337 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2338 cfs->guarantee_more(runtime_visible_annotations_length, CHECK_(nullHandle)); 2339 parse_annotations(runtime_visible_annotations, 2340 runtime_visible_annotations_length, &parsed_annotations, 2341 CHECK_(nullHandle)); 2342 cfs->skip_u1_fast(runtime_visible_annotations_length); 2343 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2344 runtime_invisible_annotations_length = method_attribute_length; 2345 runtime_invisible_annotations = cfs->get_u1_buffer(); 2346 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2347 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 2348 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2349 runtime_visible_parameter_annotations_length = method_attribute_length; 2350 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2351 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2352 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2353 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2354 runtime_invisible_parameter_annotations_length = method_attribute_length; 2355 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2356 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2357 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 2358 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2359 annotation_default_length = method_attribute_length; 2360 annotation_default = cfs->get_u1_buffer(); 2361 assert(annotation_default != NULL, "null annotation default"); 2362 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2363 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2364 if (runtime_visible_type_annotations != NULL) { 2365 classfile_parse_error( 2366 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2367 CHECK_(nullHandle)); 2368 } 2369 runtime_visible_type_annotations_length = method_attribute_length; 2370 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2371 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2372 // No need for the VM to parse Type annotations 2373 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2374 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2375 if (runtime_invisible_type_annotations_exists) { 2376 classfile_parse_error( 2377 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2378 CHECK_(nullHandle)); 2379 } else { 2380 runtime_invisible_type_annotations_exists = true; 2381 } 2382 if (PreserveAllAnnotations) { 2383 runtime_invisible_type_annotations_length = method_attribute_length; 2384 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2385 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2386 } 2387 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2388 } else { 2389 // Skip unknown attributes 2390 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2391 } 2392 } else { 2393 // Skip unknown attributes 2394 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2395 } 2396 } 2397 2398 if (linenumber_table != NULL) { 2399 linenumber_table->write_terminator(); 2400 linenumber_table_length = linenumber_table->position(); 2401 } 2402 2403 // Make sure there's at least one Code attribute in non-native/non-abstract method 2404 if (_need_verify) { 2405 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2406 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2407 } 2408 2409 // All sizing information for a Method* is finally available, now create it 2410 InlineTableSizes sizes( 2411 total_lvt_length, 2412 linenumber_table_length, 2413 exception_table_length, 2414 checked_exceptions_length, 2415 method_parameters_length, 2416 generic_signature_index, 2417 runtime_visible_annotations_length + 2418 runtime_invisible_annotations_length, 2419 runtime_visible_parameter_annotations_length + 2420 runtime_invisible_parameter_annotations_length, 2421 runtime_visible_type_annotations_length + 2422 runtime_invisible_type_annotations_length, 2423 annotation_default_length, 2424 0); 2425 2426 Method* m = Method::allocate( 2427 _loader_data, code_length, access_flags, &sizes, 2428 ConstMethod::NORMAL, CHECK_(nullHandle)); 2429 2430 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2431 2432 // Fill in information from fixed part (access_flags already set) 2433 m->set_constants(_cp); 2434 m->set_name_index(name_index); 2435 m->set_signature_index(signature_index); 2436 2437 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2438 m->constMethod()->set_result_type(rtf.type()); 2439 2440 if (args_size >= 0) { 2441 m->set_size_of_parameters(args_size); 2442 } else { 2443 m->compute_size_of_parameters(THREAD); 2444 } 2445 #ifdef ASSERT 2446 if (args_size >= 0) { 2447 m->compute_size_of_parameters(THREAD); 2448 assert(args_size == m->size_of_parameters(), ""); 2449 } 2450 #endif 2451 2452 // Fill in code attribute information 2453 m->set_max_stack(max_stack); 2454 m->set_max_locals(max_locals); 2455 if (stackmap_data != NULL) { 2456 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2457 stackmap_data_length, CHECK_NULL); 2458 } 2459 2460 // Copy byte codes 2461 m->set_code(code_start); 2462 2463 // Copy line number table 2464 if (linenumber_table != NULL) { 2465 memcpy(m->compressed_linenumber_table(), 2466 linenumber_table->buffer(), linenumber_table_length); 2467 } 2468 2469 // Copy exception table 2470 if (exception_table_length > 0) { 2471 int size = 2472 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2473 copy_u2_with_conversion((u2*) m->exception_table_start(), 2474 exception_table_start, size); 2475 } 2476 2477 // Copy method parameters 2478 if (method_parameters_length > 0) { 2479 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2480 for (int i = 0; i < method_parameters_length; i++) { 2481 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2482 method_parameters_data += 2; 2483 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2484 method_parameters_data += 2; 2485 } 2486 } 2487 2488 // Copy checked exceptions 2489 if (checked_exceptions_length > 0) { 2490 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2491 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2492 } 2493 2494 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2495 if (total_lvt_length > 0) { 2496 promoted_flags->set_has_localvariable_table(); 2497 copy_localvariable_table(m->constMethod(), lvt_cnt, 2498 localvariable_table_length, 2499 localvariable_table_start, 2500 lvtt_cnt, 2501 localvariable_type_table_length, 2502 localvariable_type_table_start, CHECK_NULL); 2503 } 2504 2505 if (parsed_annotations.has_any_annotations()) 2506 parsed_annotations.apply_to(m); 2507 2508 // Copy annotations 2509 copy_method_annotations(m->constMethod(), 2510 runtime_visible_annotations, 2511 runtime_visible_annotations_length, 2512 runtime_invisible_annotations, 2513 runtime_invisible_annotations_length, 2514 runtime_visible_parameter_annotations, 2515 runtime_visible_parameter_annotations_length, 2516 runtime_invisible_parameter_annotations, 2517 runtime_invisible_parameter_annotations_length, 2518 runtime_visible_type_annotations, 2519 runtime_visible_type_annotations_length, 2520 runtime_invisible_type_annotations, 2521 runtime_invisible_type_annotations_length, 2522 annotation_default, 2523 annotation_default_length, 2524 CHECK_NULL); 2525 2526 if (name == vmSymbols::finalize_method_name() && 2527 signature == vmSymbols::void_method_signature()) { 2528 if (m->is_empty_method()) { 2529 _has_empty_finalizer = true; 2530 } else { 2531 _has_finalizer = true; 2532 } 2533 } 2534 if (name == vmSymbols::object_initializer_name() && 2535 signature == vmSymbols::void_method_signature() && 2536 m->is_vanilla_constructor()) { 2537 _has_vanilla_constructor = true; 2538 } 2539 2540 NOT_PRODUCT(m->verify()); 2541 return m; 2542 } 2543 2544 2545 // The promoted_flags parameter is used to pass relevant access_flags 2546 // from the methods back up to the containing klass. These flag values 2547 // are added to klass's access_flags. 2548 2549 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2550 AccessFlags* promoted_flags, 2551 bool* has_final_method, 2552 bool* declares_default_methods, 2553 TRAPS) { 2554 ClassFileStream* cfs = stream(); 2555 cfs->guarantee_more(2, CHECK_NULL); // length 2556 u2 length = cfs->get_u2_fast(); 2557 if (length == 0) { 2558 _methods = Universe::the_empty_method_array(); 2559 } else { 2560 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2561 2562 HandleMark hm(THREAD); 2563 for (int index = 0; index < length; index++) { 2564 methodHandle method = parse_method(is_interface, 2565 promoted_flags, 2566 CHECK_NULL); 2567 2568 if (method->is_final()) { 2569 *has_final_method = true; 2570 } 2571 // declares_default_methods: declares concrete instance methods, any access flags 2572 // used for interface initialization, and default method inheritance analysis 2573 if (is_interface && !(*declares_default_methods) 2574 && !method->is_abstract() && !method->is_static()) { 2575 *declares_default_methods = true; 2576 } 2577 _methods->at_put(index, method()); 2578 } 2579 2580 if (_need_verify && length > 1) { 2581 // Check duplicated methods 2582 ResourceMark rm(THREAD); 2583 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2584 THREAD, NameSigHash*, HASH_ROW_SIZE); 2585 initialize_hashtable(names_and_sigs); 2586 bool dup = false; 2587 Symbol* name = NULL; 2588 Symbol* sig = NULL; 2589 { 2590 debug_only(No_Safepoint_Verifier nsv;) 2591 for (int i = 0; i < length; i++) { 2592 Method* m = _methods->at(i); 2593 name = m->name(); 2594 sig = m->signature(); 2595 // If no duplicates, add name/signature in hashtable names_and_sigs. 2596 if (!put_after_lookup(name, sig, names_and_sigs)) { 2597 dup = true; 2598 break; 2599 } 2600 } 2601 } 2602 if (dup) { 2603 classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", 2604 name->as_C_string(), sig->as_klass_external_name(), CHECK_NULL); 2605 } 2606 } 2607 } 2608 return _methods; 2609 } 2610 2611 2612 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2613 int length = methods->length(); 2614 // If JVMTI original method ordering or sharing is enabled we have to 2615 // remember the original class file ordering. 2616 // We temporarily use the vtable_index field in the Method* to store the 2617 // class file index, so we can read in after calling qsort. 2618 // Put the method ordering in the shared archive. 2619 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2620 for (int index = 0; index < length; index++) { 2621 Method* m = methods->at(index); 2622 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2623 m->set_vtable_index(index); 2624 } 2625 } 2626 // Sort method array by ascending method name (for faster lookups & vtable construction) 2627 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2628 Method::sort_methods(methods); 2629 2630 intArray* method_ordering = NULL; 2631 // If JVMTI original method ordering or sharing is enabled construct int 2632 // array remembering the original ordering 2633 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2634 method_ordering = new intArray(length); 2635 for (int index = 0; index < length; index++) { 2636 Method* m = methods->at(index); 2637 int old_index = m->vtable_index(); 2638 assert(old_index >= 0 && old_index < length, "invalid method index"); 2639 method_ordering->at_put(index, old_index); 2640 m->set_vtable_index(Method::invalid_vtable_index); 2641 } 2642 } 2643 return method_ordering; 2644 } 2645 2646 // Parse generic_signature attribute for methods and fields 2647 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { 2648 ClassFileStream* cfs = stream(); 2649 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2650 u2 generic_signature_index = cfs->get_u2_fast(); 2651 check_property( 2652 valid_symbol_at(generic_signature_index), 2653 "Invalid Signature attribute at constant pool index %u in class file %s", 2654 generic_signature_index, CHECK_0); 2655 return generic_signature_index; 2656 } 2657 2658 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2659 ClassFileStream* cfs = stream(); 2660 cfs->guarantee_more(2, CHECK); // sourcefile_index 2661 u2 sourcefile_index = cfs->get_u2_fast(); 2662 check_property( 2663 valid_symbol_at(sourcefile_index), 2664 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2665 sourcefile_index, CHECK); 2666 set_class_sourcefile_index(sourcefile_index); 2667 } 2668 2669 2670 2671 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2672 ClassFileStream* cfs = stream(); 2673 u1* sde_buffer = cfs->get_u1_buffer(); 2674 assert(sde_buffer != NULL, "null sde buffer"); 2675 2676 // Don't bother storing it if there is no way to retrieve it 2677 if (JvmtiExport::can_get_source_debug_extension()) { 2678 assert((length+1) > length, "Overflow checking"); 2679 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2680 for (int i = 0; i < length; i++) { 2681 sde[i] = sde_buffer[i]; 2682 } 2683 sde[length] = '\0'; 2684 set_class_sde_buffer((char*)sde, length); 2685 } 2686 // Got utf8 string, set stream position forward 2687 cfs->skip_u1(length, CHECK); 2688 } 2689 2690 2691 // Inner classes can be static, private or protected (classic VM does this) 2692 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2693 2694 // Return number of classes in the inner classes attribute table 2695 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2696 bool parsed_enclosingmethod_attribute, 2697 u2 enclosing_method_class_index, 2698 u2 enclosing_method_method_index, 2699 TRAPS) { 2700 ClassFileStream* cfs = stream(); 2701 u1* current_mark = cfs->current(); 2702 u2 length = 0; 2703 if (inner_classes_attribute_start != NULL) { 2704 cfs->set_current(inner_classes_attribute_start); 2705 cfs->guarantee_more(2, CHECK_0); // length 2706 length = cfs->get_u2_fast(); 2707 } 2708 2709 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2710 // method data: 2711 // [inner_class_info_index, 2712 // outer_class_info_index, 2713 // inner_name_index, 2714 // inner_class_access_flags, 2715 // ... 2716 // enclosing_method_class_index, 2717 // enclosing_method_method_index] 2718 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2719 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2720 _inner_classes = inner_classes; 2721 2722 int index = 0; 2723 int cp_size = _cp->length(); 2724 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2725 for (int n = 0; n < length; n++) { 2726 // Inner class index 2727 u2 inner_class_info_index = cfs->get_u2_fast(); 2728 check_property( 2729 inner_class_info_index == 0 || 2730 valid_klass_reference_at(inner_class_info_index), 2731 "inner_class_info_index %u has bad constant type in class file %s", 2732 inner_class_info_index, CHECK_0); 2733 // Outer class index 2734 u2 outer_class_info_index = cfs->get_u2_fast(); 2735 check_property( 2736 outer_class_info_index == 0 || 2737 valid_klass_reference_at(outer_class_info_index), 2738 "outer_class_info_index %u has bad constant type in class file %s", 2739 outer_class_info_index, CHECK_0); 2740 // Inner class name 2741 u2 inner_name_index = cfs->get_u2_fast(); 2742 check_property( 2743 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2744 "inner_name_index %u has bad constant type in class file %s", 2745 inner_name_index, CHECK_0); 2746 if (_need_verify) { 2747 guarantee_property(inner_class_info_index != outer_class_info_index, 2748 "Class is both outer and inner class in class file %s", CHECK_0); 2749 } 2750 // Access flags 2751 AccessFlags inner_access_flags; 2752 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2753 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2754 // Set abstract bit for old class files for backward compatibility 2755 flags |= JVM_ACC_ABSTRACT; 2756 } 2757 verify_legal_class_modifiers(flags, CHECK_0); 2758 inner_access_flags.set_flags(flags); 2759 2760 inner_classes->at_put(index++, inner_class_info_index); 2761 inner_classes->at_put(index++, outer_class_info_index); 2762 inner_classes->at_put(index++, inner_name_index); 2763 inner_classes->at_put(index++, inner_access_flags.as_short()); 2764 } 2765 2766 // 4347400: make sure there's no duplicate entry in the classes array 2767 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2768 for(int i = 0; i < length * 4; i += 4) { 2769 for(int j = i + 4; j < length * 4; j += 4) { 2770 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2771 inner_classes->at(i+1) != inner_classes->at(j+1) || 2772 inner_classes->at(i+2) != inner_classes->at(j+2) || 2773 inner_classes->at(i+3) != inner_classes->at(j+3)), 2774 "Duplicate entry in InnerClasses in class file %s", 2775 CHECK_0); 2776 } 2777 } 2778 } 2779 2780 // Set EnclosingMethod class and method indexes. 2781 if (parsed_enclosingmethod_attribute) { 2782 inner_classes->at_put(index++, enclosing_method_class_index); 2783 inner_classes->at_put(index++, enclosing_method_method_index); 2784 } 2785 assert(index == size, "wrong size"); 2786 2787 // Restore buffer's current position. 2788 cfs->set_current(current_mark); 2789 2790 return length; 2791 } 2792 2793 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2794 set_class_synthetic_flag(true); 2795 } 2796 2797 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2798 ClassFileStream* cfs = stream(); 2799 u2 signature_index = cfs->get_u2(CHECK); 2800 check_property( 2801 valid_symbol_at(signature_index), 2802 "Invalid constant pool index %u in Signature attribute in class file %s", 2803 signature_index, CHECK); 2804 set_class_generic_signature_index(signature_index); 2805 } 2806 2807 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2808 ClassFileStream* cfs = stream(); 2809 u1* current_start = cfs->current(); 2810 2811 guarantee_property(attribute_byte_length >= sizeof(u2), 2812 "Invalid BootstrapMethods attribute length %u in class file %s", 2813 attribute_byte_length, 2814 CHECK); 2815 2816 cfs->guarantee_more(attribute_byte_length, CHECK); 2817 2818 int attribute_array_length = cfs->get_u2_fast(); 2819 2820 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2821 "Short length on BootstrapMethods in class file %s", 2822 CHECK); 2823 2824 // The attribute contains a counted array of counted tuples of shorts, 2825 // represending bootstrap specifiers: 2826 // length*{bootstrap_method_index, argument_count*{argument_index}} 2827 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2828 // operand_count = number of shorts in attr, except for leading length 2829 2830 // The attribute is copied into a short[] array. 2831 // The array begins with a series of short[2] pairs, one for each tuple. 2832 int index_size = (attribute_array_length * 2); 2833 2834 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2835 2836 // Eagerly assign operands so they will be deallocated with the constant 2837 // pool if there is an error. 2838 _cp->set_operands(operands); 2839 2840 int operand_fill_index = index_size; 2841 int cp_size = _cp->length(); 2842 2843 for (int n = 0; n < attribute_array_length; n++) { 2844 // Store a 32-bit offset into the header of the operand array. 2845 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2846 2847 // Read a bootstrap specifier. 2848 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2849 u2 bootstrap_method_index = cfs->get_u2_fast(); 2850 u2 argument_count = cfs->get_u2_fast(); 2851 check_property( 2852 valid_cp_range(bootstrap_method_index, cp_size) && 2853 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2854 "bootstrap_method_index %u has bad constant type in class file %s", 2855 bootstrap_method_index, 2856 CHECK); 2857 2858 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 2859 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 2860 CHECK); 2861 2862 operands->at_put(operand_fill_index++, bootstrap_method_index); 2863 operands->at_put(operand_fill_index++, argument_count); 2864 2865 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2866 for (int j = 0; j < argument_count; j++) { 2867 u2 argument_index = cfs->get_u2_fast(); 2868 check_property( 2869 valid_cp_range(argument_index, cp_size) && 2870 _cp->tag_at(argument_index).is_loadable_constant(), 2871 "argument_index %u has bad constant type in class file %s", 2872 argument_index, 2873 CHECK); 2874 operands->at_put(operand_fill_index++, argument_index); 2875 } 2876 } 2877 2878 assert(operand_fill_index == operands->length(), "exact fill"); 2879 2880 u1* current_end = cfs->current(); 2881 guarantee_property(current_end == current_start + attribute_byte_length, 2882 "Bad length on BootstrapMethods in class file %s", 2883 CHECK); 2884 } 2885 2886 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2887 TRAPS) { 2888 ClassFileStream* cfs = stream(); 2889 // Set inner classes attribute to default sentinel 2890 _inner_classes = Universe::the_empty_short_array(); 2891 cfs->guarantee_more(2, CHECK); // attributes_count 2892 u2 attributes_count = cfs->get_u2_fast(); 2893 bool parsed_sourcefile_attribute = false; 2894 bool parsed_innerclasses_attribute = false; 2895 bool parsed_enclosingmethod_attribute = false; 2896 bool parsed_bootstrap_methods_attribute = false; 2897 u1* runtime_visible_annotations = NULL; 2898 int runtime_visible_annotations_length = 0; 2899 u1* runtime_invisible_annotations = NULL; 2900 int runtime_invisible_annotations_length = 0; 2901 u1* runtime_visible_type_annotations = NULL; 2902 int runtime_visible_type_annotations_length = 0; 2903 u1* runtime_invisible_type_annotations = NULL; 2904 int runtime_invisible_type_annotations_length = 0; 2905 bool runtime_invisible_type_annotations_exists = false; 2906 u1* inner_classes_attribute_start = NULL; 2907 u4 inner_classes_attribute_length = 0; 2908 u2 enclosing_method_class_index = 0; 2909 u2 enclosing_method_method_index = 0; 2910 // Iterate over attributes 2911 while (attributes_count--) { 2912 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2913 u2 attribute_name_index = cfs->get_u2_fast(); 2914 u4 attribute_length = cfs->get_u4_fast(); 2915 check_property( 2916 valid_symbol_at(attribute_name_index), 2917 "Attribute name has bad constant pool index %u in class file %s", 2918 attribute_name_index, CHECK); 2919 Symbol* tag = _cp->symbol_at(attribute_name_index); 2920 if (tag == vmSymbols::tag_source_file()) { 2921 // Check for SourceFile tag 2922 if (_need_verify) { 2923 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2924 } 2925 if (parsed_sourcefile_attribute) { 2926 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2927 } else { 2928 parsed_sourcefile_attribute = true; 2929 } 2930 parse_classfile_sourcefile_attribute(CHECK); 2931 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2932 // Check for SourceDebugExtension tag 2933 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2934 } else if (tag == vmSymbols::tag_inner_classes()) { 2935 // Check for InnerClasses tag 2936 if (parsed_innerclasses_attribute) { 2937 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2938 } else { 2939 parsed_innerclasses_attribute = true; 2940 } 2941 inner_classes_attribute_start = cfs->get_u1_buffer(); 2942 inner_classes_attribute_length = attribute_length; 2943 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2944 } else if (tag == vmSymbols::tag_synthetic()) { 2945 // Check for Synthetic tag 2946 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2947 if (attribute_length != 0) { 2948 classfile_parse_error( 2949 "Invalid Synthetic classfile attribute length %u in class file %s", 2950 attribute_length, CHECK); 2951 } 2952 parse_classfile_synthetic_attribute(CHECK); 2953 } else if (tag == vmSymbols::tag_deprecated()) { 2954 // Check for Deprecatd tag - 4276120 2955 if (attribute_length != 0) { 2956 classfile_parse_error( 2957 "Invalid Deprecated classfile attribute length %u in class file %s", 2958 attribute_length, CHECK); 2959 } 2960 } else if (_major_version >= JAVA_1_5_VERSION) { 2961 if (tag == vmSymbols::tag_signature()) { 2962 if (attribute_length != 2) { 2963 classfile_parse_error( 2964 "Wrong Signature attribute length %u in class file %s", 2965 attribute_length, CHECK); 2966 } 2967 parse_classfile_signature_attribute(CHECK); 2968 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2969 runtime_visible_annotations_length = attribute_length; 2970 runtime_visible_annotations = cfs->get_u1_buffer(); 2971 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2972 cfs->guarantee_more(runtime_visible_annotations_length, CHECK); 2973 parse_annotations(runtime_visible_annotations, 2974 runtime_visible_annotations_length, 2975 parsed_annotations, 2976 CHECK); 2977 cfs->skip_u1_fast(runtime_visible_annotations_length); 2978 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2979 runtime_invisible_annotations_length = attribute_length; 2980 runtime_invisible_annotations = cfs->get_u1_buffer(); 2981 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2982 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2983 } else if (tag == vmSymbols::tag_enclosing_method()) { 2984 if (parsed_enclosingmethod_attribute) { 2985 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2986 } else { 2987 parsed_enclosingmethod_attribute = true; 2988 } 2989 cfs->guarantee_more(4, CHECK); // class_index, method_index 2990 enclosing_method_class_index = cfs->get_u2_fast(); 2991 enclosing_method_method_index = cfs->get_u2_fast(); 2992 if (enclosing_method_class_index == 0) { 2993 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2994 } 2995 // Validate the constant pool indices and types 2996 check_property(valid_klass_reference_at(enclosing_method_class_index), 2997 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2998 if (enclosing_method_method_index != 0 && 2999 (!_cp->is_within_bounds(enclosing_method_method_index) || 3000 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3001 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3002 } 3003 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3004 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3005 if (parsed_bootstrap_methods_attribute) 3006 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3007 parsed_bootstrap_methods_attribute = true; 3008 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 3009 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3010 if (runtime_visible_type_annotations != NULL) { 3011 classfile_parse_error( 3012 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3013 } 3014 runtime_visible_type_annotations_length = attribute_length; 3015 runtime_visible_type_annotations = cfs->get_u1_buffer(); 3016 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3017 // No need for the VM to parse Type annotations 3018 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3019 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3020 if (runtime_invisible_type_annotations_exists) { 3021 classfile_parse_error( 3022 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3023 } else { 3024 runtime_invisible_type_annotations_exists = true; 3025 } 3026 if (PreserveAllAnnotations) { 3027 runtime_invisible_type_annotations_length = attribute_length; 3028 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3029 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3030 } 3031 cfs->skip_u1(attribute_length, CHECK); 3032 } else { 3033 // Unknown attribute 3034 cfs->skip_u1(attribute_length, CHECK); 3035 } 3036 } else { 3037 // Unknown attribute 3038 cfs->skip_u1(attribute_length, CHECK); 3039 } 3040 } 3041 _annotations = assemble_annotations(runtime_visible_annotations, 3042 runtime_visible_annotations_length, 3043 runtime_invisible_annotations, 3044 runtime_invisible_annotations_length, 3045 CHECK); 3046 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3047 runtime_visible_type_annotations_length, 3048 runtime_invisible_type_annotations, 3049 runtime_invisible_type_annotations_length, 3050 CHECK); 3051 3052 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3053 u2 num_of_classes = parse_classfile_inner_classes_attribute( 3054 inner_classes_attribute_start, 3055 parsed_innerclasses_attribute, 3056 enclosing_method_class_index, 3057 enclosing_method_method_index, 3058 CHECK); 3059 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3060 guarantee_property( 3061 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3062 "Wrong InnerClasses attribute length in class file %s", CHECK); 3063 } 3064 } 3065 3066 if (_max_bootstrap_specifier_index >= 0) { 3067 guarantee_property(parsed_bootstrap_methods_attribute, 3068 "Missing BootstrapMethods attribute in class file %s", CHECK); 3069 } 3070 } 3071 3072 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 3073 if (_synthetic_flag) 3074 k->set_is_synthetic(); 3075 if (_sourcefile_index != 0) { 3076 k->set_source_file_name_index(_sourcefile_index); 3077 } 3078 if (_generic_signature_index != 0) { 3079 k->set_generic_signature_index(_generic_signature_index); 3080 } 3081 if (_sde_buffer != NULL) { 3082 k->set_source_debug_extension(_sde_buffer, _sde_length); 3083 } 3084 } 3085 3086 // Create the Annotations object that will 3087 // hold the annotations array for the Klass. 3088 void ClassFileParser::create_combined_annotations(TRAPS) { 3089 if (_annotations == NULL && 3090 _type_annotations == NULL && 3091 _fields_annotations == NULL && 3092 _fields_type_annotations == NULL) { 3093 // Don't create the Annotations object unnecessarily. 3094 return; 3095 } 3096 3097 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3098 annotations->set_class_annotations(_annotations); 3099 annotations->set_class_type_annotations(_type_annotations); 3100 annotations->set_fields_annotations(_fields_annotations); 3101 annotations->set_fields_type_annotations(_fields_type_annotations); 3102 3103 // This is the Annotations object that will be 3104 // assigned to InstanceKlass being constructed. 3105 _combined_annotations = annotations; 3106 3107 // The annotations arrays below has been transfered the 3108 // _combined_annotations so these fields can now be cleared. 3109 _annotations = NULL; 3110 _type_annotations = NULL; 3111 _fields_annotations = NULL; 3112 _fields_type_annotations = NULL; 3113 } 3114 3115 // Transfer ownership of metadata allocated to the InstanceKlass. 3116 void ClassFileParser::apply_parsed_class_metadata( 3117 instanceKlassHandle this_klass, 3118 int java_fields_count, TRAPS) { 3119 _cp->set_pool_holder(this_klass()); 3120 this_klass->set_constants(_cp); 3121 this_klass->set_fields(_fields, java_fields_count); 3122 this_klass->set_methods(_methods); 3123 this_klass->set_inner_classes(_inner_classes); 3124 this_klass->set_local_interfaces(_local_interfaces); 3125 this_klass->set_transitive_interfaces(_transitive_interfaces); 3126 this_klass->set_annotations(_combined_annotations); 3127 3128 // Clear out these fields so they don't get deallocated by the destructor 3129 clear_class_metadata(); 3130 } 3131 3132 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3133 int runtime_visible_annotations_length, 3134 u1* runtime_invisible_annotations, 3135 int runtime_invisible_annotations_length, TRAPS) { 3136 AnnotationArray* annotations = NULL; 3137 if (runtime_visible_annotations != NULL || 3138 runtime_invisible_annotations != NULL) { 3139 annotations = MetadataFactory::new_array<u1>(_loader_data, 3140 runtime_visible_annotations_length + 3141 runtime_invisible_annotations_length, 3142 CHECK_(annotations)); 3143 if (runtime_visible_annotations != NULL) { 3144 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3145 annotations->at_put(i, runtime_visible_annotations[i]); 3146 } 3147 } 3148 if (runtime_invisible_annotations != NULL) { 3149 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3150 int append = runtime_visible_annotations_length+i; 3151 annotations->at_put(append, runtime_invisible_annotations[i]); 3152 } 3153 } 3154 } 3155 return annotations; 3156 } 3157 3158 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3159 TRAPS) { 3160 instanceKlassHandle super_klass; 3161 if (super_class_index == 0) { 3162 check_property(_class_name == vmSymbols::java_lang_Object(), 3163 "Invalid superclass index %u in class file %s", 3164 super_class_index, 3165 CHECK_NULL); 3166 } else { 3167 check_property(valid_klass_reference_at(super_class_index), 3168 "Invalid superclass index %u in class file %s", 3169 super_class_index, 3170 CHECK_NULL); 3171 // The class name should be legal because it is checked when parsing constant pool. 3172 // However, make sure it is not an array type. 3173 bool is_array = false; 3174 if (_cp->tag_at(super_class_index).is_klass()) { 3175 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3176 if (_need_verify) 3177 is_array = super_klass->oop_is_array(); 3178 } else if (_need_verify) { 3179 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3180 } 3181 if (_need_verify) { 3182 guarantee_property(!is_array, 3183 "Bad superclass name in class file %s", CHECK_NULL); 3184 } 3185 } 3186 return super_klass; 3187 } 3188 3189 3190 // Values needed for oopmap and InstanceKlass creation 3191 class FieldLayoutInfo : public StackObj { 3192 public: 3193 int* nonstatic_oop_offsets; 3194 unsigned int* nonstatic_oop_counts; 3195 unsigned int nonstatic_oop_map_count; 3196 unsigned int total_oop_map_count; 3197 int instance_size; 3198 int nonstatic_field_size; 3199 int static_field_size; 3200 bool has_nonstatic_fields; 3201 }; 3202 3203 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3204 void ClassFileParser::layout_fields(Handle class_loader, 3205 FieldAllocationCount* fac, 3206 ClassAnnotationCollector* parsed_annotations, 3207 FieldLayoutInfo* info, 3208 TRAPS) { 3209 3210 // Field size and offset computation 3211 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3212 int next_static_oop_offset = 0; 3213 int next_static_double_offset = 0; 3214 int next_static_word_offset = 0; 3215 int next_static_short_offset = 0; 3216 int next_static_byte_offset = 0; 3217 int next_nonstatic_oop_offset = 0; 3218 int next_nonstatic_double_offset = 0; 3219 int next_nonstatic_word_offset = 0; 3220 int next_nonstatic_short_offset = 0; 3221 int next_nonstatic_byte_offset = 0; 3222 int first_nonstatic_oop_offset = 0; 3223 int next_nonstatic_field_offset = 0; 3224 int next_nonstatic_padded_offset = 0; 3225 3226 // Count the contended fields by type. 3227 // 3228 // We ignore static fields, because @Contended is not supported for them. 3229 // The layout code below will also ignore the static fields. 3230 int nonstatic_contended_count = 0; 3231 FieldAllocationCount fac_contended; 3232 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3233 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3234 if (fs.is_contended()) { 3235 fac_contended.count[atype]++; 3236 if (!fs.access_flags().is_static()) { 3237 nonstatic_contended_count++; 3238 } 3239 } 3240 } 3241 3242 3243 // Calculate the starting byte offsets 3244 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3245 next_static_double_offset = next_static_oop_offset + 3246 ((fac->count[STATIC_OOP]) * heapOopSize); 3247 if ( fac->count[STATIC_DOUBLE] && 3248 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3249 Universe::field_type_should_be_aligned(T_LONG)) ) { 3250 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3251 } 3252 3253 next_static_word_offset = next_static_double_offset + 3254 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3255 next_static_short_offset = next_static_word_offset + 3256 ((fac->count[STATIC_WORD]) * BytesPerInt); 3257 next_static_byte_offset = next_static_short_offset + 3258 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3259 3260 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3261 nonstatic_field_size * heapOopSize; 3262 3263 next_nonstatic_field_offset = nonstatic_fields_start; 3264 3265 bool is_contended_class = parsed_annotations->is_contended(); 3266 3267 // Class is contended, pad before all the fields 3268 if (is_contended_class) { 3269 next_nonstatic_field_offset += ContendedPaddingWidth; 3270 } 3271 3272 // Compute the non-contended fields count. 3273 // The packing code below relies on these counts to determine if some field 3274 // can be squeezed into the alignment gap. Contended fields are obviously 3275 // exempt from that. 3276 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3277 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3278 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3279 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3280 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3281 3282 // Total non-static fields count, including every contended field 3283 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3284 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3285 fac->count[NONSTATIC_OOP]; 3286 3287 bool super_has_nonstatic_fields = 3288 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3289 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3290 3291 3292 // Prepare list of oops for oop map generation. 3293 // 3294 // "offset" and "count" lists are describing the set of contiguous oop 3295 // regions. offset[i] is the start of the i-th region, which then has 3296 // count[i] oops following. Before we know how many regions are required, 3297 // we pessimistically allocate the maps to fit all the oops into the 3298 // distinct regions. 3299 // 3300 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3301 // to figure out if we still need to do this. 3302 int* nonstatic_oop_offsets; 3303 unsigned int* nonstatic_oop_counts; 3304 unsigned int nonstatic_oop_map_count = 0; 3305 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3306 3307 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3308 THREAD, int, max_nonstatic_oop_maps); 3309 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3310 THREAD, unsigned int, max_nonstatic_oop_maps); 3311 3312 first_nonstatic_oop_offset = 0; // will be set for first oop field 3313 3314 bool compact_fields = CompactFields; 3315 int allocation_style = FieldsAllocationStyle; 3316 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3317 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3318 allocation_style = 1; // Optimistic 3319 } 3320 3321 // The next classes have predefined hard-coded fields offsets 3322 // (see in JavaClasses::compute_hard_coded_offsets()). 3323 // Use default fields allocation order for them. 3324 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3325 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3326 _class_name == vmSymbols::java_lang_Class() || 3327 _class_name == vmSymbols::java_lang_ClassLoader() || 3328 _class_name == vmSymbols::java_lang_ref_Reference() || 3329 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3330 _class_name == vmSymbols::java_lang_StackTraceElement() || 3331 _class_name == vmSymbols::java_lang_String() || 3332 _class_name == vmSymbols::java_lang_Throwable() || 3333 _class_name == vmSymbols::java_lang_Boolean() || 3334 _class_name == vmSymbols::java_lang_Character() || 3335 _class_name == vmSymbols::java_lang_Float() || 3336 _class_name == vmSymbols::java_lang_Double() || 3337 _class_name == vmSymbols::java_lang_Byte() || 3338 _class_name == vmSymbols::java_lang_Short() || 3339 _class_name == vmSymbols::java_lang_Integer() || 3340 _class_name == vmSymbols::java_lang_Long())) { 3341 allocation_style = 0; // Allocate oops first 3342 compact_fields = false; // Don't compact fields 3343 } 3344 3345 // Rearrange fields for a given allocation style 3346 if( allocation_style == 0 ) { 3347 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3348 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3349 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3350 (nonstatic_oop_count * heapOopSize); 3351 } else if( allocation_style == 1 ) { 3352 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3353 next_nonstatic_double_offset = next_nonstatic_field_offset; 3354 } else if( allocation_style == 2 ) { 3355 // Fields allocation: oops fields in super and sub classes are together. 3356 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3357 _super_klass->nonstatic_oop_map_size() > 0 ) { 3358 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3359 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3360 OopMapBlock* last_map = first_map + map_count - 1; 3361 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3362 if (next_offset == next_nonstatic_field_offset) { 3363 allocation_style = 0; // allocate oops first 3364 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3365 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3366 (nonstatic_oop_count * heapOopSize); 3367 } 3368 } 3369 if( allocation_style == 2 ) { 3370 allocation_style = 1; // allocate oops last 3371 next_nonstatic_double_offset = next_nonstatic_field_offset; 3372 } 3373 } else { 3374 ShouldNotReachHere(); 3375 } 3376 3377 int nonstatic_oop_space_count = 0; 3378 int nonstatic_word_space_count = 0; 3379 int nonstatic_short_space_count = 0; 3380 int nonstatic_byte_space_count = 0; 3381 int nonstatic_oop_space_offset = 0; 3382 int nonstatic_word_space_offset = 0; 3383 int nonstatic_short_space_offset = 0; 3384 int nonstatic_byte_space_offset = 0; 3385 3386 // Try to squeeze some of the fields into the gaps due to 3387 // long/double alignment. 3388 if( nonstatic_double_count > 0 ) { 3389 int offset = next_nonstatic_double_offset; 3390 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3391 if( compact_fields && offset != next_nonstatic_double_offset ) { 3392 // Allocate available fields into the gap before double field. 3393 int length = next_nonstatic_double_offset - offset; 3394 assert(length == BytesPerInt, ""); 3395 nonstatic_word_space_offset = offset; 3396 if( nonstatic_word_count > 0 ) { 3397 nonstatic_word_count -= 1; 3398 nonstatic_word_space_count = 1; // Only one will fit 3399 length -= BytesPerInt; 3400 offset += BytesPerInt; 3401 } 3402 nonstatic_short_space_offset = offset; 3403 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3404 nonstatic_short_count -= 1; 3405 nonstatic_short_space_count += 1; 3406 length -= BytesPerShort; 3407 offset += BytesPerShort; 3408 } 3409 nonstatic_byte_space_offset = offset; 3410 while( length > 0 && nonstatic_byte_count > 0 ) { 3411 nonstatic_byte_count -= 1; 3412 nonstatic_byte_space_count += 1; 3413 length -= 1; 3414 } 3415 // Allocate oop field in the gap if there are no other fields for that. 3416 nonstatic_oop_space_offset = offset; 3417 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3418 allocation_style != 0 ) { // when oop fields not first 3419 nonstatic_oop_count -= 1; 3420 nonstatic_oop_space_count = 1; // Only one will fit 3421 length -= heapOopSize; 3422 offset += heapOopSize; 3423 } 3424 } 3425 } 3426 3427 next_nonstatic_word_offset = next_nonstatic_double_offset + 3428 (nonstatic_double_count * BytesPerLong); 3429 next_nonstatic_short_offset = next_nonstatic_word_offset + 3430 (nonstatic_word_count * BytesPerInt); 3431 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3432 (nonstatic_short_count * BytesPerShort); 3433 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3434 nonstatic_byte_count; 3435 3436 // let oops jump before padding with this allocation style 3437 if( allocation_style == 1 ) { 3438 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3439 if( nonstatic_oop_count > 0 ) { 3440 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3441 } 3442 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3443 } 3444 3445 // Iterate over fields again and compute correct offsets. 3446 // The field allocation type was temporarily stored in the offset slot. 3447 // oop fields are located before non-oop fields (static and non-static). 3448 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3449 3450 // skip already laid out fields 3451 if (fs.is_offset_set()) continue; 3452 3453 // contended instance fields are handled below 3454 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3455 3456 int real_offset = 0; 3457 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3458 3459 // pack the rest of the fields 3460 switch (atype) { 3461 case STATIC_OOP: 3462 real_offset = next_static_oop_offset; 3463 next_static_oop_offset += heapOopSize; 3464 break; 3465 case STATIC_BYTE: 3466 real_offset = next_static_byte_offset; 3467 next_static_byte_offset += 1; 3468 break; 3469 case STATIC_SHORT: 3470 real_offset = next_static_short_offset; 3471 next_static_short_offset += BytesPerShort; 3472 break; 3473 case STATIC_WORD: 3474 real_offset = next_static_word_offset; 3475 next_static_word_offset += BytesPerInt; 3476 break; 3477 case STATIC_DOUBLE: 3478 real_offset = next_static_double_offset; 3479 next_static_double_offset += BytesPerLong; 3480 break; 3481 case NONSTATIC_OOP: 3482 if( nonstatic_oop_space_count > 0 ) { 3483 real_offset = nonstatic_oop_space_offset; 3484 nonstatic_oop_space_offset += heapOopSize; 3485 nonstatic_oop_space_count -= 1; 3486 } else { 3487 real_offset = next_nonstatic_oop_offset; 3488 next_nonstatic_oop_offset += heapOopSize; 3489 } 3490 // Update oop maps 3491 if( nonstatic_oop_map_count > 0 && 3492 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3493 real_offset - 3494 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3495 heapOopSize ) { 3496 // Extend current oop map 3497 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3498 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3499 } else { 3500 // Create new oop map 3501 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3502 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3503 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3504 nonstatic_oop_map_count += 1; 3505 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3506 first_nonstatic_oop_offset = real_offset; 3507 } 3508 } 3509 break; 3510 case NONSTATIC_BYTE: 3511 if( nonstatic_byte_space_count > 0 ) { 3512 real_offset = nonstatic_byte_space_offset; 3513 nonstatic_byte_space_offset += 1; 3514 nonstatic_byte_space_count -= 1; 3515 } else { 3516 real_offset = next_nonstatic_byte_offset; 3517 next_nonstatic_byte_offset += 1; 3518 } 3519 break; 3520 case NONSTATIC_SHORT: 3521 if( nonstatic_short_space_count > 0 ) { 3522 real_offset = nonstatic_short_space_offset; 3523 nonstatic_short_space_offset += BytesPerShort; 3524 nonstatic_short_space_count -= 1; 3525 } else { 3526 real_offset = next_nonstatic_short_offset; 3527 next_nonstatic_short_offset += BytesPerShort; 3528 } 3529 break; 3530 case NONSTATIC_WORD: 3531 if( nonstatic_word_space_count > 0 ) { 3532 real_offset = nonstatic_word_space_offset; 3533 nonstatic_word_space_offset += BytesPerInt; 3534 nonstatic_word_space_count -= 1; 3535 } else { 3536 real_offset = next_nonstatic_word_offset; 3537 next_nonstatic_word_offset += BytesPerInt; 3538 } 3539 break; 3540 case NONSTATIC_DOUBLE: 3541 real_offset = next_nonstatic_double_offset; 3542 next_nonstatic_double_offset += BytesPerLong; 3543 break; 3544 default: 3545 ShouldNotReachHere(); 3546 } 3547 fs.set_offset(real_offset); 3548 } 3549 3550 3551 // Handle the contended cases. 3552 // 3553 // Each contended field should not intersect the cache line with another contended field. 3554 // In the absence of alignment information, we end up with pessimistically separating 3555 // the fields with full-width padding. 3556 // 3557 // Additionally, this should not break alignment for the fields, so we round the alignment up 3558 // for each field. 3559 if (nonstatic_contended_count > 0) { 3560 3561 // if there is at least one contended field, we need to have pre-padding for them 3562 next_nonstatic_padded_offset += ContendedPaddingWidth; 3563 3564 // collect all contended groups 3565 BitMap bm(_cp->size()); 3566 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3567 // skip already laid out fields 3568 if (fs.is_offset_set()) continue; 3569 3570 if (fs.is_contended()) { 3571 bm.set_bit(fs.contended_group()); 3572 } 3573 } 3574 3575 int current_group = -1; 3576 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3577 3578 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3579 3580 // skip already laid out fields 3581 if (fs.is_offset_set()) continue; 3582 3583 // skip non-contended fields and fields from different group 3584 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3585 3586 // handle statics below 3587 if (fs.access_flags().is_static()) continue; 3588 3589 int real_offset = 0; 3590 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3591 3592 switch (atype) { 3593 case NONSTATIC_BYTE: 3594 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3595 real_offset = next_nonstatic_padded_offset; 3596 next_nonstatic_padded_offset += 1; 3597 break; 3598 3599 case NONSTATIC_SHORT: 3600 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3601 real_offset = next_nonstatic_padded_offset; 3602 next_nonstatic_padded_offset += BytesPerShort; 3603 break; 3604 3605 case NONSTATIC_WORD: 3606 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3607 real_offset = next_nonstatic_padded_offset; 3608 next_nonstatic_padded_offset += BytesPerInt; 3609 break; 3610 3611 case NONSTATIC_DOUBLE: 3612 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3613 real_offset = next_nonstatic_padded_offset; 3614 next_nonstatic_padded_offset += BytesPerLong; 3615 break; 3616 3617 case NONSTATIC_OOP: 3618 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3619 real_offset = next_nonstatic_padded_offset; 3620 next_nonstatic_padded_offset += heapOopSize; 3621 3622 // Create new oop map 3623 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3624 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3625 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3626 nonstatic_oop_map_count += 1; 3627 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3628 first_nonstatic_oop_offset = real_offset; 3629 } 3630 break; 3631 3632 default: 3633 ShouldNotReachHere(); 3634 } 3635 3636 if (fs.contended_group() == 0) { 3637 // Contended group defines the equivalence class over the fields: 3638 // the fields within the same contended group are not inter-padded. 3639 // The only exception is default group, which does not incur the 3640 // equivalence, and so requires intra-padding. 3641 next_nonstatic_padded_offset += ContendedPaddingWidth; 3642 } 3643 3644 fs.set_offset(real_offset); 3645 } // for 3646 3647 // Start laying out the next group. 3648 // Note that this will effectively pad the last group in the back; 3649 // this is expected to alleviate memory contention effects for 3650 // subclass fields and/or adjacent object. 3651 // If this was the default group, the padding is already in place. 3652 if (current_group != 0) { 3653 next_nonstatic_padded_offset += ContendedPaddingWidth; 3654 } 3655 } 3656 3657 // handle static fields 3658 } 3659 3660 // Entire class is contended, pad in the back. 3661 // This helps to alleviate memory contention effects for subclass fields 3662 // and/or adjacent object. 3663 if (is_contended_class) { 3664 next_nonstatic_padded_offset += ContendedPaddingWidth; 3665 } 3666 3667 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3668 3669 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3670 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3671 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3672 3673 int static_field_size = (static_fields_end - 3674 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3675 nonstatic_field_size = nonstatic_field_size + 3676 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3677 3678 int instance_size = align_object_size(instance_end / wordSize); 3679 3680 assert(instance_size == align_object_size(align_size_up( 3681 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3682 wordSize) / wordSize), "consistent layout helper value"); 3683 3684 // Invariant: nonstatic_field end/start should only change if there are 3685 // nonstatic fields in the class, or if the class is contended. We compare 3686 // against the non-aligned value, so that end alignment will not fail the 3687 // assert without actually having the fields. 3688 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3689 is_contended_class || 3690 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3691 3692 // Number of non-static oop map blocks allocated at end of klass. 3693 const unsigned int total_oop_map_count = 3694 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3695 first_nonstatic_oop_offset); 3696 3697 #ifndef PRODUCT 3698 if (PrintFieldLayout) { 3699 print_field_layout(_class_name, 3700 _fields, 3701 _cp, 3702 instance_size, 3703 nonstatic_fields_start, 3704 nonstatic_fields_end, 3705 static_fields_end); 3706 } 3707 3708 #endif 3709 // Pass back information needed for InstanceKlass creation 3710 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3711 info->nonstatic_oop_counts = nonstatic_oop_counts; 3712 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3713 info->total_oop_map_count = total_oop_map_count; 3714 info->instance_size = instance_size; 3715 info->static_field_size = static_field_size; 3716 info->nonstatic_field_size = nonstatic_field_size; 3717 info->has_nonstatic_fields = has_nonstatic_fields; 3718 } 3719 3720 3721 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3722 ClassLoaderData* loader_data, 3723 Handle protection_domain, 3724 KlassHandle host_klass, 3725 GrowableArray<Handle>* cp_patches, 3726 TempNewSymbol& parsed_name, 3727 bool verify, 3728 TRAPS) { 3729 3730 // When a retransformable agent is attached, JVMTI caches the 3731 // class bytes that existed before the first retransformation. 3732 // If RedefineClasses() was used before the retransformable 3733 // agent attached, then the cached class bytes may not be the 3734 // original class bytes. 3735 JvmtiCachedClassFileData *cached_class_file = NULL; 3736 Handle class_loader(THREAD, loader_data->class_loader()); 3737 bool has_default_methods = false; 3738 bool declares_default_methods = false; 3739 ResourceMark rm(THREAD); 3740 3741 ClassFileStream* cfs = stream(); 3742 // Timing 3743 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3744 JavaThread* jt = (JavaThread*) THREAD; 3745 3746 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3747 ClassLoader::perf_class_parse_selftime(), 3748 NULL, 3749 jt->get_thread_stat()->perf_recursion_counts_addr(), 3750 jt->get_thread_stat()->perf_timers_addr(), 3751 PerfClassTraceTime::PARSE_CLASS); 3752 3753 init_parsed_class_attributes(loader_data); 3754 3755 if (JvmtiExport::should_post_class_file_load_hook()) { 3756 // Get the cached class file bytes (if any) from the class that 3757 // is being redefined or retransformed. We use jvmti_thread_state() 3758 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3759 // a JvmtiThreadState any earlier than necessary. This will help 3760 // avoid the bug described by 7126851. 3761 JvmtiThreadState *state = jt->jvmti_thread_state(); 3762 if (state != NULL) { 3763 KlassHandle *h_class_being_redefined = 3764 state->get_class_being_redefined(); 3765 if (h_class_being_redefined != NULL) { 3766 instanceKlassHandle ikh_class_being_redefined = 3767 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3768 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3769 } 3770 } 3771 3772 unsigned char* ptr = cfs->buffer(); 3773 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3774 3775 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3776 &ptr, &end_ptr, &cached_class_file); 3777 3778 if (ptr != cfs->buffer()) { 3779 // JVMTI agent has modified class file data. 3780 // Set new class file stream using JVMTI agent modified 3781 // class file data. 3782 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3783 set_stream(cfs); 3784 } 3785 } 3786 3787 _host_klass = host_klass; 3788 _cp_patches = cp_patches; 3789 3790 instanceKlassHandle nullHandle; 3791 3792 // Figure out whether we can skip format checking (matching classic VM behavior) 3793 if (DumpSharedSpaces) { 3794 // verify == true means it's a 'remote' class (i.e., non-boot class) 3795 // Verification decision is based on BytecodeVerificationRemote flag 3796 // for those classes. 3797 _need_verify = (verify) ? BytecodeVerificationRemote : 3798 BytecodeVerificationLocal; 3799 } else { 3800 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3801 } 3802 3803 // Set the verify flag in stream 3804 cfs->set_verify(_need_verify); 3805 3806 // Save the class file name for easier error message printing. 3807 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3808 3809 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3810 // Magic value 3811 u4 magic = cfs->get_u4_fast(); 3812 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3813 "Incompatible magic value %u in class file %s", 3814 magic, CHECK_(nullHandle)); 3815 3816 // Version numbers 3817 u2 minor_version = cfs->get_u2_fast(); 3818 u2 major_version = cfs->get_u2_fast(); 3819 3820 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { 3821 ResourceMark rm; 3822 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 3823 major_version, minor_version, name->as_C_string()); 3824 Exceptions::fthrow( 3825 THREAD_AND_LOCATION, 3826 vmSymbols::java_lang_UnsupportedClassVersionError(), 3827 "Unsupported major.minor version for dump time %u.%u", 3828 major_version, 3829 minor_version); 3830 } 3831 3832 // Check version numbers - we check this even with verifier off 3833 if (!is_supported_version(major_version, minor_version)) { 3834 if (name == NULL) { 3835 Exceptions::fthrow( 3836 THREAD_AND_LOCATION, 3837 vmSymbols::java_lang_UnsupportedClassVersionError(), 3838 "Unsupported class file version %u.%u, " 3839 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3840 major_version, 3841 minor_version, 3842 JAVA_MAX_SUPPORTED_VERSION, 3843 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3844 } else { 3845 ResourceMark rm(THREAD); 3846 Exceptions::fthrow( 3847 THREAD_AND_LOCATION, 3848 vmSymbols::java_lang_UnsupportedClassVersionError(), 3849 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 3850 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3851 name->as_C_string(), 3852 major_version, 3853 minor_version, 3854 JAVA_MAX_SUPPORTED_VERSION, 3855 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3856 } 3857 return nullHandle; 3858 } 3859 3860 _major_version = major_version; 3861 _minor_version = minor_version; 3862 3863 3864 // Check if verification needs to be relaxed for this class file 3865 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3866 _relax_verify = Verifier::relax_verify_for(class_loader()); 3867 3868 // Constant pool 3869 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3870 3871 int cp_size = cp->length(); 3872 3873 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3874 3875 // Access flags 3876 AccessFlags access_flags; 3877 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3878 3879 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3880 // Set abstract bit for old class files for backward compatibility 3881 flags |= JVM_ACC_ABSTRACT; 3882 } 3883 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3884 access_flags.set_flags(flags); 3885 3886 // This class and superclass 3887 _this_class_index = cfs->get_u2_fast(); 3888 check_property( 3889 valid_cp_range(_this_class_index, cp_size) && 3890 cp->tag_at(_this_class_index).is_unresolved_klass(), 3891 "Invalid this class index %u in constant pool in class file %s", 3892 _this_class_index, CHECK_(nullHandle)); 3893 3894 Symbol* class_name = cp->unresolved_klass_at(_this_class_index); 3895 assert(class_name != NULL, "class_name can't be null"); 3896 3897 // It's important to set parsed_name *before* resolving the super class. 3898 // (it's used for cleanup by the caller if parsing fails) 3899 parsed_name = class_name; 3900 // parsed_name is returned and can be used if there's an error, so add to 3901 // its reference count. Caller will decrement the refcount. 3902 parsed_name->increment_refcount(); 3903 3904 // Update _class_name which could be null previously to be class_name 3905 _class_name = class_name; 3906 3907 // Don't need to check whether this class name is legal or not. 3908 // It has been checked when constant pool is parsed. 3909 // However, make sure it is not an array type. 3910 if (_need_verify) { 3911 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3912 "Bad class name in class file %s", 3913 CHECK_(nullHandle)); 3914 } 3915 3916 Klass* preserve_this_klass; // for storing result across HandleMark 3917 3918 // release all handles when parsing is done 3919 { HandleMark hm(THREAD); 3920 3921 // Checks if name in class file matches requested name 3922 if (name != NULL && class_name != name) { 3923 ResourceMark rm(THREAD); 3924 Exceptions::fthrow( 3925 THREAD_AND_LOCATION, 3926 vmSymbols::java_lang_NoClassDefFoundError(), 3927 "%s (wrong name: %s)", 3928 name->as_C_string(), 3929 class_name->as_C_string() 3930 ); 3931 return nullHandle; 3932 } 3933 3934 if (TraceClassLoadingPreorder) { 3935 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3936 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3937 tty->print_cr("]"); 3938 } 3939 #if INCLUDE_CDS 3940 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { 3941 // Only dump the classes that can be stored into CDS archive 3942 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { 3943 if (name != NULL) { 3944 ResourceMark rm(THREAD); 3945 classlist_file->print_cr("%s", name->as_C_string()); 3946 classlist_file->flush(); 3947 } 3948 } 3949 } 3950 #endif 3951 3952 u2 super_class_index = cfs->get_u2_fast(); 3953 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3954 CHECK_NULL); 3955 3956 // Interfaces 3957 u2 itfs_len = cfs->get_u2_fast(); 3958 Array<Klass*>* local_interfaces = 3959 parse_interfaces(itfs_len, protection_domain, _class_name, 3960 &has_default_methods, CHECK_(nullHandle)); 3961 3962 u2 java_fields_count = 0; 3963 // Fields (offsets are filled in later) 3964 FieldAllocationCount fac; 3965 Array<u2>* fields = parse_fields(class_name, 3966 access_flags.is_interface(), 3967 &fac, &java_fields_count, 3968 CHECK_(nullHandle)); 3969 // Methods 3970 bool has_final_method = false; 3971 AccessFlags promoted_flags; 3972 promoted_flags.set_flags(0); 3973 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 3974 &promoted_flags, 3975 &has_final_method, 3976 &declares_default_methods, 3977 CHECK_(nullHandle)); 3978 if (declares_default_methods) { 3979 has_default_methods = true; 3980 } 3981 3982 // Additional attributes 3983 ClassAnnotationCollector parsed_annotations; 3984 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 3985 3986 // Finalize the Annotations metadata object, 3987 // now that all annotation arrays have been created. 3988 create_combined_annotations(CHECK_(nullHandle)); 3989 3990 // Make sure this is the end of class file stream 3991 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3992 3993 if (_class_name == vmSymbols::java_lang_Object()) { 3994 check_property(_local_interfaces == Universe::the_empty_klass_array(), 3995 "java.lang.Object cannot implement an interface in class file %s", 3996 CHECK_(nullHandle)); 3997 } 3998 // We check super class after class file is parsed and format is checked 3999 if (super_class_index > 0 && super_klass.is_null()) { 4000 Symbol* sk = cp->klass_name_at(super_class_index); 4001 if (access_flags.is_interface()) { 4002 // Before attempting to resolve the superclass, check for class format 4003 // errors not checked yet. 4004 guarantee_property(sk == vmSymbols::java_lang_Object(), 4005 "Interfaces must have java.lang.Object as superclass in class file %s", 4006 CHECK_(nullHandle)); 4007 } 4008 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 4009 class_loader, 4010 protection_domain, 4011 true, 4012 CHECK_(nullHandle)); 4013 4014 KlassHandle kh (THREAD, k); 4015 super_klass = instanceKlassHandle(THREAD, kh()); 4016 } 4017 if (super_klass.not_null()) { 4018 4019 if (super_klass->has_default_methods()) { 4020 has_default_methods = true; 4021 } 4022 4023 if (super_klass->is_interface()) { 4024 ResourceMark rm(THREAD); 4025 Exceptions::fthrow( 4026 THREAD_AND_LOCATION, 4027 vmSymbols::java_lang_IncompatibleClassChangeError(), 4028 "class %s has interface %s as super class", 4029 class_name->as_klass_external_name(), 4030 super_klass->external_name() 4031 ); 4032 return nullHandle; 4033 } 4034 // Make sure super class is not final 4035 if (super_klass->is_final()) { 4036 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 4037 } 4038 } 4039 4040 // save super klass for error handling. 4041 _super_klass = super_klass; 4042 4043 // Compute the transitive list of all unique interfaces implemented by this class 4044 _transitive_interfaces = 4045 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 4046 4047 // sort methods 4048 intArray* method_ordering = sort_methods(methods); 4049 4050 // promote flags from parse_methods() to the klass' flags 4051 access_flags.add_promoted_flags(promoted_flags.as_int()); 4052 4053 // Size of Java vtable (in words) 4054 int vtable_size = 0; 4055 int itable_size = 0; 4056 int num_miranda_methods = 0; 4057 4058 GrowableArray<Method*> all_mirandas(20); 4059 4060 klassVtable::compute_vtable_size_and_num_mirandas( 4061 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 4062 access_flags, class_loader, class_name, local_interfaces, 4063 CHECK_(nullHandle)); 4064 4065 // Size of Java itable (in words) 4066 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 4067 4068 FieldLayoutInfo info; 4069 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 4070 4071 int total_oop_map_size2 = 4072 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 4073 4074 // Compute reference type 4075 ReferenceType rt; 4076 if (super_klass() == NULL) { 4077 rt = REF_NONE; 4078 } else { 4079 rt = super_klass->reference_type(); 4080 } 4081 4082 // We can now create the basic Klass* for this klass 4083 _klass = InstanceKlass::allocate_instance_klass(loader_data, 4084 vtable_size, 4085 itable_size, 4086 info.static_field_size, 4087 total_oop_map_size2, 4088 rt, 4089 access_flags, 4090 name, 4091 super_klass(), 4092 !host_klass.is_null(), 4093 CHECK_(nullHandle)); 4094 instanceKlassHandle this_klass (THREAD, _klass); 4095 4096 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 4097 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 4098 "sanity"); 4099 4100 // Fill in information already parsed 4101 this_klass->set_should_verify_class(verify); 4102 jint lh = Klass::instance_layout_helper(info.instance_size, false); 4103 this_klass->set_layout_helper(lh); 4104 assert(this_klass->oop_is_instance(), "layout is correct"); 4105 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 4106 // Not yet: supers are done below to support the new subtype-checking fields 4107 //this_klass->set_super(super_klass()); 4108 this_klass->set_class_loader_data(loader_data); 4109 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 4110 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 4111 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 4112 4113 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 4114 4115 if (has_final_method) { 4116 this_klass->set_has_final_method(); 4117 } 4118 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 4119 // The InstanceKlass::_methods_jmethod_ids cache 4120 // is managed on the assumption that the initial cache 4121 // size is equal to the number of methods in the class. If 4122 // that changes, then InstanceKlass::idnum_can_increment() 4123 // has to be changed accordingly. 4124 this_klass->set_initial_method_idnum(methods->length()); 4125 this_klass->set_name(cp->klass_name_at(_this_class_index)); 4126 if (is_anonymous()) // I am well known to myself 4127 cp->klass_at_put(_this_class_index, this_klass()); // eagerly resolve 4128 4129 this_klass->set_minor_version(minor_version); 4130 this_klass->set_major_version(major_version); 4131 this_klass->set_has_default_methods(has_default_methods); 4132 this_klass->set_declares_default_methods(declares_default_methods); 4133 4134 if (!host_klass.is_null()) { 4135 assert (this_klass->is_anonymous(), "should be the same"); 4136 this_klass->set_host_klass(host_klass()); 4137 } 4138 4139 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4140 // (We used to do this lazily, but now we query it in Rewriter, 4141 // which is eagerly done for every method, so we might as well do it now, 4142 // when everything is fresh in memory.) 4143 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { 4144 for (int j = 0; j < methods->length(); j++) { 4145 methods->at(j)->init_intrinsic_id(); 4146 } 4147 } 4148 4149 if (cached_class_file != NULL) { 4150 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4151 this_klass->set_cached_class_file(cached_class_file); 4152 } 4153 4154 // Fill in field values obtained by parse_classfile_attributes 4155 if (parsed_annotations.has_any_annotations()) 4156 parsed_annotations.apply_to(this_klass); 4157 apply_parsed_class_attributes(this_klass); 4158 4159 // Miranda methods 4160 if ((num_miranda_methods > 0) || 4161 // if this class introduced new miranda methods or 4162 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4163 // super class exists and this class inherited miranda methods 4164 ) { 4165 this_klass->set_has_miranda_methods(); // then set a flag 4166 } 4167 4168 // Fill in information needed to compute superclasses. 4169 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4170 4171 // Initialize itable offset tables 4172 klassItable::setup_itable_offset_table(this_klass); 4173 4174 // Compute transitive closure of interfaces this class implements 4175 // Do final class setup 4176 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4177 4178 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4179 set_precomputed_flags(this_klass); 4180 4181 // reinitialize modifiers, using the InnerClasses attribute 4182 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4183 this_klass->set_modifier_flags(computed_modifiers); 4184 4185 // check if this class can access its super class 4186 check_super_class_access(this_klass, CHECK_(nullHandle)); 4187 4188 // check if this class can access its superinterfaces 4189 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4190 4191 // check if this class overrides any final method 4192 check_final_method_override(this_klass, CHECK_(nullHandle)); 4193 4194 // check that if this class is an interface then it doesn't have static methods 4195 if (this_klass->is_interface()) { 4196 /* An interface in a JAVA 8 classfile can be static */ 4197 if (_major_version < JAVA_8_VERSION) { 4198 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4199 } 4200 } 4201 4202 // Allocate mirror and initialize static fields 4203 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, 4204 CHECK_(nullHandle)); 4205 4206 // Generate any default methods - default methods are interface methods 4207 // that have a default implementation. This is new with Lambda project. 4208 if (has_default_methods ) { 4209 DefaultMethods::generate_default_methods( 4210 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4211 } 4212 4213 // Update the loader_data graph. 4214 record_defined_class_dependencies(this_klass, CHECK_NULL); 4215 4216 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4217 false /* not shared class */); 4218 4219 if (TraceClassLoading) { 4220 ResourceMark rm; 4221 // print in a single call to reduce interleaving of output 4222 if (cfs->source() != NULL) { 4223 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4224 cfs->source()); 4225 } else if (class_loader.is_null()) { 4226 Klass* caller = 4227 THREAD->is_Java_thread() 4228 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 4229 : NULL; 4230 // caller can be NULL, for example, during a JVMTI VM_Init hook 4231 if (caller != NULL) { 4232 tty->print("[Loaded %s by instance of %s]\n", 4233 this_klass->external_name(), 4234 InstanceKlass::cast(caller)->external_name()); 4235 } else { 4236 tty->print("[Loaded %s]\n", this_klass->external_name()); 4237 } 4238 } else { 4239 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4240 InstanceKlass::cast(class_loader->klass())->external_name()); 4241 } 4242 } 4243 4244 if (TraceClassResolution) { 4245 ResourceMark rm; 4246 // print out the superclass. 4247 const char * from = this_klass()->external_name(); 4248 if (this_klass->java_super() != NULL) { 4249 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4250 } 4251 // print out each of the interface classes referred to by this class. 4252 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4253 if (local_interfaces != NULL) { 4254 int length = local_interfaces->length(); 4255 for (int i = 0; i < length; i++) { 4256 Klass* k = local_interfaces->at(i); 4257 InstanceKlass* to_class = InstanceKlass::cast(k); 4258 const char * to = to_class->external_name(); 4259 tty->print("RESOLVE %s %s (interface)\n", from, to); 4260 } 4261 } 4262 } 4263 4264 // preserve result across HandleMark 4265 preserve_this_klass = this_klass(); 4266 } 4267 4268 JFR_ONLY(INIT_ID(preserve_this_klass);) 4269 4270 // Create new handle outside HandleMark (might be needed for 4271 // Extended Class Redefinition) 4272 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4273 debug_only(this_klass->verify();) 4274 4275 // Clear class if no error has occurred so destructor doesn't deallocate it 4276 _klass = NULL; 4277 return this_klass; 4278 } 4279 4280 // Destructor to clean up if there's an error 4281 ClassFileParser::~ClassFileParser() { 4282 MetadataFactory::free_metadata(_loader_data, _cp); 4283 MetadataFactory::free_array<u2>(_loader_data, _fields); 4284 4285 // Free methods 4286 InstanceKlass::deallocate_methods(_loader_data, _methods); 4287 4288 // beware of the Universe::empty_blah_array!! 4289 if (_inner_classes != Universe::the_empty_short_array()) { 4290 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4291 } 4292 4293 // Free interfaces 4294 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4295 _local_interfaces, _transitive_interfaces); 4296 4297 if (_combined_annotations != NULL) { 4298 // After all annotations arrays have been created, they are installed into the 4299 // Annotations object that will be assigned to the InstanceKlass being created. 4300 4301 // Deallocate the Annotations object and the installed annotations arrays. 4302 _combined_annotations->deallocate_contents(_loader_data); 4303 4304 // If the _combined_annotations pointer is non-NULL, 4305 // then the other annotations fields should have been cleared. 4306 assert(_annotations == NULL, "Should have been cleared"); 4307 assert(_type_annotations == NULL, "Should have been cleared"); 4308 assert(_fields_annotations == NULL, "Should have been cleared"); 4309 assert(_fields_type_annotations == NULL, "Should have been cleared"); 4310 } else { 4311 // If the annotations arrays were not installed into the Annotations object, 4312 // then they have to be deallocated explicitly. 4313 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4314 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4315 Annotations::free_contents(_loader_data, _fields_annotations); 4316 Annotations::free_contents(_loader_data, _fields_type_annotations); 4317 } 4318 4319 clear_class_metadata(); 4320 4321 // deallocate the klass if already created. Don't directly deallocate, but add 4322 // to the deallocate list so that the klass is removed from the CLD::_klasses list 4323 // at a safepoint. 4324 if (_klass != NULL) { 4325 _loader_data->add_to_deallocate_list(_klass); 4326 } 4327 _klass = NULL; 4328 } 4329 4330 void ClassFileParser::print_field_layout(Symbol* name, 4331 Array<u2>* fields, 4332 constantPoolHandle cp, 4333 int instance_size, 4334 int instance_fields_start, 4335 int instance_fields_end, 4336 int static_fields_end) { 4337 tty->print("%s: field layout\n", name->as_klass_external_name()); 4338 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4339 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4340 if (!fs.access_flags().is_static()) { 4341 tty->print(" @%3d \"%s\" %s\n", 4342 fs.offset(), 4343 fs.name()->as_klass_external_name(), 4344 fs.signature()->as_klass_external_name()); 4345 } 4346 } 4347 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4348 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4349 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4350 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4351 if (fs.access_flags().is_static()) { 4352 tty->print(" @%3d \"%s\" %s\n", 4353 fs.offset(), 4354 fs.name()->as_klass_external_name(), 4355 fs.signature()->as_klass_external_name()); 4356 } 4357 } 4358 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4359 tty->print("\n"); 4360 } 4361 4362 unsigned int 4363 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4364 unsigned int nonstatic_oop_map_count, 4365 int first_nonstatic_oop_offset) { 4366 unsigned int map_count = 4367 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4368 if (nonstatic_oop_map_count > 0) { 4369 // We have oops to add to map 4370 if (map_count == 0) { 4371 map_count = nonstatic_oop_map_count; 4372 } else { 4373 // Check whether we should add a new map block or whether the last one can 4374 // be extended 4375 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4376 OopMapBlock* const last_map = first_map + map_count - 1; 4377 4378 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4379 if (next_offset == first_nonstatic_oop_offset) { 4380 // There is no gap bettwen superklass's last oop field and first 4381 // local oop field, merge maps. 4382 nonstatic_oop_map_count -= 1; 4383 } else { 4384 // Superklass didn't end with a oop field, add extra maps 4385 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4386 } 4387 map_count += nonstatic_oop_map_count; 4388 } 4389 } 4390 return map_count; 4391 } 4392 4393 4394 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4395 unsigned int nonstatic_oop_map_count, 4396 int* nonstatic_oop_offsets, 4397 unsigned int* nonstatic_oop_counts) { 4398 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4399 const InstanceKlass* const super = k->superklass(); 4400 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4401 if (super_count > 0) { 4402 // Copy maps from superklass 4403 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4404 for (unsigned int i = 0; i < super_count; ++i) { 4405 *this_oop_map++ = *super_oop_map++; 4406 } 4407 } 4408 4409 if (nonstatic_oop_map_count > 0) { 4410 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4411 // The counts differ because there is no gap between superklass's last oop 4412 // field and the first local oop field. Extend the last oop map copied 4413 // from the superklass instead of creating new one. 4414 nonstatic_oop_map_count--; 4415 nonstatic_oop_offsets++; 4416 this_oop_map--; 4417 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4418 this_oop_map++; 4419 } 4420 4421 // Add new map blocks, fill them 4422 while (nonstatic_oop_map_count-- > 0) { 4423 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4424 this_oop_map->set_count(*nonstatic_oop_counts++); 4425 this_oop_map++; 4426 } 4427 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4428 this_oop_map, "sanity"); 4429 } 4430 } 4431 4432 4433 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4434 Klass* super = k->super(); 4435 4436 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4437 // in which case we don't have to register objects as finalizable 4438 if (!_has_empty_finalizer) { 4439 if (_has_finalizer || 4440 (super != NULL && super->has_finalizer())) { 4441 k->set_has_finalizer(); 4442 } 4443 } 4444 4445 #ifdef ASSERT 4446 bool f = false; 4447 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4448 vmSymbols::void_method_signature()); 4449 if (m != NULL && !m->is_empty_method()) { 4450 f = true; 4451 } 4452 4453 // Spec doesn't prevent agent from redefinition of empty finalizer. 4454 // Despite the fact that it's generally bad idea and redefined finalizer 4455 // will not work as expected we shouldn't abort vm in this case 4456 if (!k->has_redefined_this_or_super()) { 4457 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4458 } 4459 #endif 4460 4461 // Check if this klass supports the java.lang.Cloneable interface 4462 if (SystemDictionary::Cloneable_klass_loaded()) { 4463 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4464 k->set_is_cloneable(); 4465 } 4466 } 4467 4468 // Check if this klass has a vanilla default constructor 4469 if (super == NULL) { 4470 // java.lang.Object has empty default constructor 4471 k->set_has_vanilla_constructor(); 4472 } else { 4473 if (super->has_vanilla_constructor() && 4474 _has_vanilla_constructor) { 4475 k->set_has_vanilla_constructor(); 4476 } 4477 #ifdef ASSERT 4478 bool v = false; 4479 if (super->has_vanilla_constructor()) { 4480 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4481 ), vmSymbols::void_method_signature()); 4482 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4483 v = true; 4484 } 4485 } 4486 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4487 #endif 4488 } 4489 4490 // If it cannot be fast-path allocated, set a bit in the layout helper. 4491 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4492 assert(k->size_helper() > 0, "layout_helper is initialized"); 4493 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4494 || k->is_abstract() || k->is_interface() 4495 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4496 || k->size_helper() >= FastAllocateSizeLimit) { 4497 // Forbid fast-path allocation. 4498 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4499 k->set_layout_helper(lh); 4500 } 4501 } 4502 4503 // Attach super classes and interface classes to class loader data 4504 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4505 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4506 if (defining_loader_data->is_the_null_class_loader_data()) { 4507 // Dependencies to null class loader data are implicit. 4508 return; 4509 } else { 4510 // add super class dependency 4511 Klass* super = defined_klass->super(); 4512 if (super != NULL) { 4513 defining_loader_data->record_dependency(super, CHECK); 4514 } 4515 4516 // add super interface dependencies 4517 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4518 if (local_interfaces != NULL) { 4519 int length = local_interfaces->length(); 4520 for (int i = 0; i < length; i++) { 4521 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4522 } 4523 } 4524 } 4525 } 4526 4527 // utility methods for appending an array with check for duplicates 4528 4529 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4530 // iterate over new interfaces 4531 for (int i = 0; i < ifs->length(); i++) { 4532 Klass* e = ifs->at(i); 4533 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4534 // add new interface 4535 result->append_if_missing(e); 4536 } 4537 } 4538 4539 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4540 instanceKlassHandle super, 4541 Array<Klass*>* local_ifs, TRAPS) { 4542 // Compute maximum size for transitive interfaces 4543 int max_transitive_size = 0; 4544 int super_size = 0; 4545 // Add superclass transitive interfaces size 4546 if (super.not_null()) { 4547 super_size = super->transitive_interfaces()->length(); 4548 max_transitive_size += super_size; 4549 } 4550 // Add local interfaces' super interfaces 4551 int local_size = local_ifs->length(); 4552 for (int i = 0; i < local_size; i++) { 4553 Klass* l = local_ifs->at(i); 4554 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4555 } 4556 // Finally add local interfaces 4557 max_transitive_size += local_size; 4558 // Construct array 4559 if (max_transitive_size == 0) { 4560 // no interfaces, use canonicalized array 4561 return Universe::the_empty_klass_array(); 4562 } else if (max_transitive_size == super_size) { 4563 // no new local interfaces added, share superklass' transitive interface array 4564 return super->transitive_interfaces(); 4565 } else if (max_transitive_size == local_size) { 4566 // only local interfaces added, share local interface array 4567 return local_ifs; 4568 } else { 4569 ResourceMark rm; 4570 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4571 4572 // Copy down from superclass 4573 if (super.not_null()) { 4574 append_interfaces(result, super->transitive_interfaces()); 4575 } 4576 4577 // Copy down from local interfaces' superinterfaces 4578 for (int i = 0; i < local_ifs->length(); i++) { 4579 Klass* l = local_ifs->at(i); 4580 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4581 } 4582 // Finally add local interfaces 4583 append_interfaces(result, local_ifs); 4584 4585 // length will be less than the max_transitive_size if duplicates were removed 4586 int length = result->length(); 4587 assert(length <= max_transitive_size, "just checking"); 4588 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4589 for (int i = 0; i < length; i++) { 4590 Klass* e = result->at(i); 4591 assert(e != NULL, "just checking"); 4592 new_result->at_put(i, e); 4593 } 4594 return new_result; 4595 } 4596 } 4597 4598 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4599 Klass* super = this_klass->super(); 4600 if ((super != NULL) && 4601 (!Reflection::verify_class_access(this_klass(), super, false))) { 4602 ResourceMark rm(THREAD); 4603 Exceptions::fthrow( 4604 THREAD_AND_LOCATION, 4605 vmSymbols::java_lang_IllegalAccessError(), 4606 "class %s cannot access its superclass %s", 4607 this_klass->external_name(), 4608 InstanceKlass::cast(super)->external_name() 4609 ); 4610 return; 4611 } 4612 } 4613 4614 4615 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4616 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4617 int lng = local_interfaces->length(); 4618 for (int i = lng - 1; i >= 0; i--) { 4619 Klass* k = local_interfaces->at(i); 4620 assert (k != NULL && k->is_interface(), "invalid interface"); 4621 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4622 ResourceMark rm(THREAD); 4623 Exceptions::fthrow( 4624 THREAD_AND_LOCATION, 4625 vmSymbols::java_lang_IllegalAccessError(), 4626 "class %s cannot access its superinterface %s", 4627 this_klass->external_name(), 4628 InstanceKlass::cast(k)->external_name() 4629 ); 4630 return; 4631 } 4632 } 4633 } 4634 4635 4636 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4637 Array<Method*>* methods = this_klass->methods(); 4638 int num_methods = methods->length(); 4639 4640 // go thru each method and check if it overrides a final method 4641 for (int index = 0; index < num_methods; index++) { 4642 Method* m = methods->at(index); 4643 4644 // skip private, static, and <init> methods 4645 if ((!m->is_private() && !m->is_static()) && 4646 (m->name() != vmSymbols::object_initializer_name())) { 4647 4648 Symbol* name = m->name(); 4649 Symbol* signature = m->signature(); 4650 Klass* k = this_klass->super(); 4651 Method* super_m = NULL; 4652 while (k != NULL) { 4653 // skip supers that don't have final methods. 4654 if (k->has_final_method()) { 4655 // lookup a matching method in the super class hierarchy 4656 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4657 if (super_m == NULL) { 4658 break; // didn't find any match; get out 4659 } 4660 4661 if (super_m->is_final() && !super_m->is_static() && 4662 // matching method in super is final, and not static 4663 (Reflection::verify_field_access(this_klass(), 4664 super_m->method_holder(), 4665 super_m->method_holder(), 4666 super_m->access_flags(), false)) 4667 // this class can access super final method and therefore override 4668 ) { 4669 ResourceMark rm(THREAD); 4670 Exceptions::fthrow( 4671 THREAD_AND_LOCATION, 4672 vmSymbols::java_lang_VerifyError(), 4673 "class %s overrides final method %s.%s", 4674 this_klass->external_name(), 4675 name->as_C_string(), 4676 signature->as_C_string() 4677 ); 4678 return; 4679 } 4680 4681 // continue to look from super_m's holder's super. 4682 k = super_m->method_holder()->super(); 4683 continue; 4684 } 4685 4686 k = k->super(); 4687 } 4688 } 4689 } 4690 } 4691 4692 4693 // assumes that this_klass is an interface 4694 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4695 assert(this_klass->is_interface(), "not an interface"); 4696 Array<Method*>* methods = this_klass->methods(); 4697 int num_methods = methods->length(); 4698 4699 for (int index = 0; index < num_methods; index++) { 4700 Method* m = methods->at(index); 4701 // if m is static and not the init method, throw a verify error 4702 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4703 ResourceMark rm(THREAD); 4704 Exceptions::fthrow( 4705 THREAD_AND_LOCATION, 4706 vmSymbols::java_lang_VerifyError(), 4707 "Illegal static method %s in interface %s", 4708 m->name()->as_C_string(), 4709 this_klass->external_name() 4710 ); 4711 return; 4712 } 4713 } 4714 } 4715 4716 // utility methods for format checking 4717 4718 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4719 if (!_need_verify) { return; } 4720 4721 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4722 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4723 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4724 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4725 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4726 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4727 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4728 4729 if ((is_abstract && is_final) || 4730 (is_interface && !is_abstract) || 4731 (is_interface && major_gte_15 && (is_super || is_enum)) || 4732 (!is_interface && major_gte_15 && is_annotation)) { 4733 ResourceMark rm(THREAD); 4734 Exceptions::fthrow( 4735 THREAD_AND_LOCATION, 4736 vmSymbols::java_lang_ClassFormatError(), 4737 "Illegal class modifiers in class %s: 0x%X", 4738 _class_name->as_C_string(), flags 4739 ); 4740 return; 4741 } 4742 } 4743 4744 bool ClassFileParser::has_illegal_visibility(jint flags) { 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 4749 return ((is_public && is_protected) || 4750 (is_public && is_private) || 4751 (is_protected && is_private)); 4752 } 4753 4754 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4755 u2 max_version = 4756 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : 4757 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION); 4758 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4759 (major <= max_version) && 4760 ((major != max_version) || 4761 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4762 } 4763 4764 void ClassFileParser::verify_legal_field_modifiers( 4765 jint flags, bool is_interface, TRAPS) { 4766 if (!_need_verify) { return; } 4767 4768 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4769 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4770 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4771 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4772 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4773 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4774 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4775 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4776 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4777 4778 bool is_illegal = false; 4779 4780 if (is_interface) { 4781 if (!is_public || !is_static || !is_final || is_private || 4782 is_protected || is_volatile || is_transient || 4783 (major_gte_15 && is_enum)) { 4784 is_illegal = true; 4785 } 4786 } else { // not interface 4787 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4788 is_illegal = true; 4789 } 4790 } 4791 4792 if (is_illegal) { 4793 ResourceMark rm(THREAD); 4794 Exceptions::fthrow( 4795 THREAD_AND_LOCATION, 4796 vmSymbols::java_lang_ClassFormatError(), 4797 "Illegal field modifiers in class %s: 0x%X", 4798 _class_name->as_C_string(), flags); 4799 return; 4800 } 4801 } 4802 4803 void ClassFileParser::verify_legal_method_modifiers( 4804 jint flags, bool is_interface, Symbol* name, TRAPS) { 4805 if (!_need_verify) { return; } 4806 4807 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4808 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4809 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4810 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4811 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4812 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4813 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4814 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4815 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4816 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4817 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4818 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4819 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4820 4821 bool is_illegal = false; 4822 4823 if (is_interface) { 4824 if (major_gte_8) { 4825 // Class file version is JAVA_8_VERSION or later Methods of 4826 // interfaces may set any of the flags except ACC_PROTECTED, 4827 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4828 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4829 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4830 (is_native || is_protected || is_final || is_synchronized) || 4831 // If a specific method of a class or interface has its 4832 // ACC_ABSTRACT flag set, it must not have any of its 4833 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4834 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4835 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4836 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4837 (is_abstract && (is_private || is_static || is_strict))) { 4838 is_illegal = true; 4839 } 4840 } else if (major_gte_15) { 4841 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4842 if (!is_public || is_static || is_final || is_synchronized || 4843 is_native || !is_abstract || is_strict) { 4844 is_illegal = true; 4845 } 4846 } else { 4847 // Class file version is pre-JAVA_1_5_VERSION 4848 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4849 is_illegal = true; 4850 } 4851 } 4852 } else { // not interface 4853 if (is_initializer) { 4854 if (is_static || is_final || is_synchronized || is_native || 4855 is_abstract || (major_gte_15 && is_bridge)) { 4856 is_illegal = true; 4857 } 4858 } else { // not initializer 4859 if (is_abstract) { 4860 if ((is_final || is_native || is_private || is_static || 4861 (major_gte_15 && (is_synchronized || is_strict)))) { 4862 is_illegal = true; 4863 } 4864 } 4865 if (has_illegal_visibility(flags)) { 4866 is_illegal = true; 4867 } 4868 } 4869 } 4870 4871 if (is_illegal) { 4872 ResourceMark rm(THREAD); 4873 Exceptions::fthrow( 4874 THREAD_AND_LOCATION, 4875 vmSymbols::java_lang_ClassFormatError(), 4876 "Method %s in class %s has illegal modifiers: 0x%X", 4877 name->as_C_string(), _class_name->as_C_string(), flags); 4878 return; 4879 } 4880 } 4881 4882 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4883 assert(_need_verify, "only called when _need_verify is true"); 4884 int i = 0; 4885 int count = length >> 2; 4886 for (int k=0; k<count; k++) { 4887 unsigned char b0 = buffer[i]; 4888 unsigned char b1 = buffer[i+1]; 4889 unsigned char b2 = buffer[i+2]; 4890 unsigned char b3 = buffer[i+3]; 4891 // For an unsigned char v, 4892 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4893 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4894 unsigned char res = b0 | b0 - 1 | 4895 b1 | b1 - 1 | 4896 b2 | b2 - 1 | 4897 b3 | b3 - 1; 4898 if (res >= 128) break; 4899 i += 4; 4900 } 4901 for(; i < length; i++) { 4902 unsigned short c; 4903 // no embedded zeros 4904 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4905 if(buffer[i] < 128) { 4906 continue; 4907 } 4908 if ((i + 5) < length) { // see if it's legal supplementary character 4909 if (UTF8::is_supplementary_character(&buffer[i])) { 4910 c = UTF8::get_supplementary_character(&buffer[i]); 4911 i += 5; 4912 continue; 4913 } 4914 } 4915 switch (buffer[i] >> 4) { 4916 default: break; 4917 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4918 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4919 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4920 c = (buffer[i] & 0x1F) << 6; 4921 i++; 4922 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4923 c += buffer[i] & 0x3F; 4924 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4925 // for classes with major > 47, c must a null or a character in its shortest form 4926 break; 4927 } 4928 } 4929 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4930 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4931 c = (buffer[i] & 0xF) << 12; 4932 i += 2; 4933 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4934 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4935 if (_major_version <= 47 || c >= 0x800) { 4936 // for classes with major > 47, c must be in its shortest form 4937 break; 4938 } 4939 } 4940 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4941 } // end of switch 4942 } // end of for 4943 } 4944 4945 // Checks if name is a legal class name. 4946 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4947 if (!_need_verify || _relax_verify) { return; } 4948 4949 char buf[fixed_buffer_size]; 4950 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4951 unsigned int length = name->utf8_length(); 4952 bool legal = false; 4953 4954 if (length > 0) { 4955 char* p; 4956 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4957 p = skip_over_field_signature(bytes, false, length, CHECK); 4958 legal = (p != NULL) && ((p - bytes) == (int)length); 4959 } else if (_major_version < JAVA_1_5_VERSION) { 4960 if (bytes[0] != '<') { 4961 p = skip_over_field_name(bytes, true, length); 4962 legal = (p != NULL) && ((p - bytes) == (int)length); 4963 } 4964 } else { 4965 // 4900761: relax the constraints based on JSR202 spec 4966 // Class names may be drawn from the entire Unicode character set. 4967 // Identifiers between '/' must be unqualified names. 4968 // The utf8 string has been verified when parsing cpool entries. 4969 legal = verify_unqualified_name(bytes, length, LegalClass); 4970 } 4971 } 4972 if (!legal) { 4973 ResourceMark rm(THREAD); 4974 Exceptions::fthrow( 4975 THREAD_AND_LOCATION, 4976 vmSymbols::java_lang_ClassFormatError(), 4977 "Illegal class name \"%s\" in class file %s", bytes, 4978 _class_name->as_C_string() 4979 ); 4980 return; 4981 } 4982 } 4983 4984 // Checks if name is a legal field name. 4985 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 4986 if (!_need_verify || _relax_verify) { return; } 4987 4988 char buf[fixed_buffer_size]; 4989 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4990 unsigned int length = name->utf8_length(); 4991 bool legal = false; 4992 4993 if (length > 0) { 4994 if (_major_version < JAVA_1_5_VERSION) { 4995 if (bytes[0] != '<') { 4996 char* p = skip_over_field_name(bytes, false, length); 4997 legal = (p != NULL) && ((p - bytes) == (int)length); 4998 } 4999 } else { 5000 // 4881221: relax the constraints based on JSR202 spec 5001 legal = verify_unqualified_name(bytes, length, LegalField); 5002 } 5003 } 5004 5005 if (!legal) { 5006 ResourceMark rm(THREAD); 5007 Exceptions::fthrow( 5008 THREAD_AND_LOCATION, 5009 vmSymbols::java_lang_ClassFormatError(), 5010 "Illegal field name \"%s\" in class %s", bytes, 5011 _class_name->as_C_string() 5012 ); 5013 return; 5014 } 5015 } 5016 5017 // Checks if name is a legal method name. 5018 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 5019 if (!_need_verify || _relax_verify) { return; } 5020 5021 assert(name != NULL, "method name is null"); 5022 char buf[fixed_buffer_size]; 5023 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5024 unsigned int length = name->utf8_length(); 5025 bool legal = false; 5026 5027 if (length > 0) { 5028 if (bytes[0] == '<') { 5029 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5030 legal = true; 5031 } 5032 } else if (_major_version < JAVA_1_5_VERSION) { 5033 char* p; 5034 p = skip_over_field_name(bytes, false, length); 5035 legal = (p != NULL) && ((p - bytes) == (int)length); 5036 } else { 5037 // 4881221: relax the constraints based on JSR202 spec 5038 legal = verify_unqualified_name(bytes, length, LegalMethod); 5039 } 5040 } 5041 5042 if (!legal) { 5043 ResourceMark rm(THREAD); 5044 Exceptions::fthrow( 5045 THREAD_AND_LOCATION, 5046 vmSymbols::java_lang_ClassFormatError(), 5047 "Illegal method name \"%s\" in class %s", bytes, 5048 _class_name->as_C_string() 5049 ); 5050 return; 5051 } 5052 } 5053 5054 5055 // Checks if signature is a legal field signature. 5056 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 5057 if (!_need_verify) { return; } 5058 5059 char buf[fixed_buffer_size]; 5060 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5061 unsigned int length = signature->utf8_length(); 5062 char* p = skip_over_field_signature(bytes, false, length, CHECK); 5063 5064 if (p == NULL || (p - bytes) != (int)length) { 5065 throwIllegalSignature("Field", name, signature, CHECK); 5066 } 5067 } 5068 5069 // Checks if signature is a legal method signature. 5070 // Returns number of parameters 5071 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 5072 if (!_need_verify) { 5073 // make sure caller's args_size will be less than 0 even for non-static 5074 // method so it will be recomputed in compute_size_of_parameters(). 5075 return -2; 5076 } 5077 5078 unsigned int args_size = 0; 5079 char buf[fixed_buffer_size]; 5080 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5081 unsigned int length = signature->utf8_length(); 5082 char* nextp; 5083 5084 // The first character must be a '(' 5085 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5086 length--; 5087 // Skip over legal field signatures 5088 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5089 while ((length > 0) && (nextp != NULL)) { 5090 args_size++; 5091 if (p[0] == 'J' || p[0] == 'D') { 5092 args_size++; 5093 } 5094 length -= nextp - p; 5095 p = nextp; 5096 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5097 } 5098 // The first non-signature thing better be a ')' 5099 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5100 length--; 5101 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5102 // All internal methods must return void 5103 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5104 return args_size; 5105 } 5106 } else { 5107 // Now we better just have a return value 5108 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5109 if (nextp && ((int)length == (nextp - p))) { 5110 return args_size; 5111 } 5112 } 5113 } 5114 } 5115 // Report error 5116 throwIllegalSignature("Method", name, signature, CHECK_0); 5117 return 0; 5118 } 5119 5120 5121 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5122 // Method names also may not contain the characters '<' or '>', unless <init> 5123 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5124 // method. Because these names have been checked as special cases before 5125 // calling this method in verify_legal_method_name. 5126 bool ClassFileParser::verify_unqualified_name( 5127 char* name, unsigned int length, int type) { 5128 jchar ch; 5129 5130 for (char* p = name; p != name + length; ) { 5131 ch = *p; 5132 if (ch < 128) { 5133 p++; 5134 if (ch == '.' || ch == ';' || ch == '[' ) { 5135 return false; // do not permit '.', ';', or '[' 5136 } 5137 if (type != LegalClass && ch == '/') { 5138 return false; // do not permit '/' unless it's class name 5139 } 5140 if (type == LegalMethod && (ch == '<' || ch == '>')) { 5141 return false; // do not permit '<' or '>' in method names 5142 } 5143 } else { 5144 char* tmp_p = UTF8::next(p, &ch); 5145 p = tmp_p; 5146 } 5147 } 5148 return true; 5149 } 5150 5151 5152 // Take pointer to a string. Skip over the longest part of the string that could 5153 // be taken as a fieldname. Allow '/' if slash_ok is true. 5154 // Return a pointer to just past the fieldname. 5155 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5156 // being true, we saw consecutive slashes (meaning we were looking for a 5157 // qualified path but found something that was badly-formed). 5158 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5159 char* p; 5160 jchar ch; 5161 jboolean last_is_slash = false; 5162 jboolean not_first_ch = false; 5163 5164 for (p = name; p != name + length; not_first_ch = true) { 5165 char* old_p = p; 5166 ch = *p; 5167 if (ch < 128) { 5168 p++; 5169 // quick check for ascii 5170 if ((ch >= 'a' && ch <= 'z') || 5171 (ch >= 'A' && ch <= 'Z') || 5172 (ch == '_' || ch == '$') || 5173 (not_first_ch && ch >= '0' && ch <= '9')) { 5174 last_is_slash = false; 5175 continue; 5176 } 5177 if (slash_ok && ch == '/') { 5178 if (last_is_slash) { 5179 return NULL; // Don't permit consecutive slashes 5180 } 5181 last_is_slash = true; 5182 continue; 5183 } 5184 } else { 5185 jint unicode_ch; 5186 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5187 p = tmp_p; 5188 last_is_slash = false; 5189 // Check if ch is Java identifier start or is Java identifier part 5190 // 4672820: call java.lang.Character methods directly without generating separate tables. 5191 EXCEPTION_MARK; 5192 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5193 5194 // return value 5195 JavaValue result(T_BOOLEAN); 5196 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5197 JavaCallArguments args; 5198 args.push_int(unicode_ch); 5199 5200 // public static boolean isJavaIdentifierStart(char ch); 5201 JavaCalls::call_static(&result, 5202 klass, 5203 vmSymbols::isJavaIdentifierStart_name(), 5204 vmSymbols::int_bool_signature(), 5205 &args, 5206 THREAD); 5207 5208 if (HAS_PENDING_EXCEPTION) { 5209 CLEAR_PENDING_EXCEPTION; 5210 return 0; 5211 } 5212 if (result.get_jboolean()) { 5213 continue; 5214 } 5215 5216 if (not_first_ch) { 5217 // public static boolean isJavaIdentifierPart(char ch); 5218 JavaCalls::call_static(&result, 5219 klass, 5220 vmSymbols::isJavaIdentifierPart_name(), 5221 vmSymbols::int_bool_signature(), 5222 &args, 5223 THREAD); 5224 5225 if (HAS_PENDING_EXCEPTION) { 5226 CLEAR_PENDING_EXCEPTION; 5227 return 0; 5228 } 5229 5230 if (result.get_jboolean()) { 5231 continue; 5232 } 5233 } 5234 } 5235 return (not_first_ch) ? old_p : NULL; 5236 } 5237 return (not_first_ch) ? p : NULL; 5238 } 5239 5240 5241 // Take pointer to a string. Skip over the longest part of the string that could 5242 // be taken as a field signature. Allow "void" if void_ok. 5243 // Return a pointer to just past the signature. 5244 // Return NULL if no legal signature is found. 5245 char* ClassFileParser::skip_over_field_signature(char* signature, 5246 bool void_ok, 5247 unsigned int length, 5248 TRAPS) { 5249 unsigned int array_dim = 0; 5250 while (length > 0) { 5251 switch (signature[0]) { 5252 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5253 case JVM_SIGNATURE_BOOLEAN: 5254 case JVM_SIGNATURE_BYTE: 5255 case JVM_SIGNATURE_CHAR: 5256 case JVM_SIGNATURE_SHORT: 5257 case JVM_SIGNATURE_INT: 5258 case JVM_SIGNATURE_FLOAT: 5259 case JVM_SIGNATURE_LONG: 5260 case JVM_SIGNATURE_DOUBLE: 5261 return signature + 1; 5262 case JVM_SIGNATURE_CLASS: { 5263 if (_major_version < JAVA_1_5_VERSION) { 5264 // Skip over the class name if one is there 5265 char* p = skip_over_field_name(signature + 1, true, --length); 5266 5267 // The next character better be a semicolon 5268 if (p && (p - signature) > 1 && p[0] == ';') { 5269 return p + 1; 5270 } 5271 } else { 5272 // 4900761: For class version > 48, any unicode is allowed in class name. 5273 length--; 5274 signature++; 5275 while (length > 0 && signature[0] != ';') { 5276 if (signature[0] == '.') { 5277 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5278 } 5279 length--; 5280 signature++; 5281 } 5282 if (signature[0] == ';') { return signature + 1; } 5283 } 5284 5285 return NULL; 5286 } 5287 case JVM_SIGNATURE_ARRAY: 5288 array_dim++; 5289 if (array_dim > 255) { 5290 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5291 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5292 } 5293 // The rest of what's there better be a legal signature 5294 signature++; 5295 length--; 5296 void_ok = false; 5297 break; 5298 5299 default: 5300 return NULL; 5301 } 5302 } 5303 return NULL; 5304 } 5305 5306 #if INCLUDE_JFR 5307 5308 // Caller responsible for ResourceMark 5309 // clone stream with rewound position 5310 ClassFileStream* ClassFileParser::clone_stream() const { 5311 assert(_stream != NULL, "invariant"); 5312 5313 return _stream->clone(); 5314 } 5315 5316 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { 5317 #ifdef ASSERT 5318 if (klass != NULL) { 5319 assert(NULL == _klass, "leaking?"); 5320 } 5321 #endif 5322 5323 _klass = klass; 5324 } 5325 5326 #endif // INCLUDE_JFR