1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classFileParser.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/defaultMethods.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #if INCLUDE_CDS 35 #include "classfile/systemDictionaryShared.hpp" 36 #endif 37 #include "classfile/verificationType.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "memory/allocation.hpp" 41 #include "memory/gcLocker.hpp" 42 #include "memory/metadataFactory.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/referenceType.hpp" 45 #include "memory/universe.inline.hpp" 46 #include "oops/constantPool.hpp" 47 #include "oops/fieldStreams.hpp" 48 #include "oops/instanceKlass.hpp" 49 #include "oops/instanceMirrorKlass.hpp" 50 #include "oops/klass.inline.hpp" 51 #include "oops/klassVtable.hpp" 52 #include "oops/method.hpp" 53 #include "oops/symbol.hpp" 54 #include "prims/jvm.h" 55 #include "prims/jvmtiExport.hpp" 56 #include "prims/jvmtiThreadState.hpp" 57 #include "runtime/javaCalls.hpp" 58 #include "runtime/perfData.hpp" 59 #include "runtime/reflection.hpp" 60 #include "runtime/signature.hpp" 61 #include "runtime/timer.hpp" 62 #include "services/classLoadingService.hpp" 63 #include "services/threadService.hpp" 64 #include "utilities/array.hpp" 65 #include "utilities/globalDefinitions.hpp" 66 #include "utilities/ostream.hpp" 67 68 // We generally try to create the oops directly when parsing, rather than 69 // allocating temporary data structures and copying the bytes twice. A 70 // temporary area is only needed when parsing utf8 entries in the constant 71 // pool and when parsing line number tables. 72 73 // We add assert in debug mode when class format is not checked. 74 75 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 76 #define JAVA_MIN_SUPPORTED_VERSION 45 77 #define JAVA_MAX_SUPPORTED_VERSION 52 78 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 79 80 // Used for two backward compatibility reasons: 81 // - to check for new additions to the class file format in JDK1.5 82 // - to check for bug fixes in the format checker in JDK1.5 83 #define JAVA_1_5_VERSION 49 84 85 // Used for backward compatibility reasons: 86 // - to check for javac bug fixes that happened after 1.5 87 // - also used as the max version when running in jdk6 88 #define JAVA_6_VERSION 50 89 90 // Used for backward compatibility reasons: 91 // - to check NameAndType_info signatures more aggressively 92 #define JAVA_7_VERSION 51 93 94 // Extension method support. 95 #define JAVA_8_VERSION 52 96 97 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 98 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 99 // this function (_current can be allocated in a register, with scalar 100 // replacement of aggregates). The _current pointer is copied back to 101 // stream() when this function returns. DON'T call another method within 102 // this method that uses stream(). 103 ClassFileStream* cfs0 = stream(); 104 ClassFileStream cfs1 = *cfs0; 105 ClassFileStream* cfs = &cfs1; 106 #ifdef ASSERT 107 assert(cfs->allocated_on_stack(),"should be local"); 108 u1* old_current = cfs0->current(); 109 #endif 110 Handle class_loader(THREAD, _loader_data->class_loader()); 111 112 // Used for batching symbol allocations. 113 const char* names[SymbolTable::symbol_alloc_batch_size]; 114 int lengths[SymbolTable::symbol_alloc_batch_size]; 115 int indices[SymbolTable::symbol_alloc_batch_size]; 116 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 117 int names_count = 0; 118 119 // parsing Index 0 is unused 120 for (int index = 1; index < length; index++) { 121 // Each of the following case guarantees one more byte in the stream 122 // for the following tag or the access_flags following constant pool, 123 // so we don't need bounds-check for reading tag. 124 u1 tag = cfs->get_u1_fast(); 125 switch (tag) { 126 case JVM_CONSTANT_Class : 127 { 128 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 129 u2 name_index = cfs->get_u2_fast(); 130 _cp->klass_index_at_put(index, name_index); 131 } 132 break; 133 case JVM_CONSTANT_Fieldref : 134 { 135 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 136 u2 class_index = cfs->get_u2_fast(); 137 u2 name_and_type_index = cfs->get_u2_fast(); 138 _cp->field_at_put(index, class_index, name_and_type_index); 139 } 140 break; 141 case JVM_CONSTANT_Methodref : 142 { 143 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 144 u2 class_index = cfs->get_u2_fast(); 145 u2 name_and_type_index = cfs->get_u2_fast(); 146 _cp->method_at_put(index, class_index, name_and_type_index); 147 } 148 break; 149 case JVM_CONSTANT_InterfaceMethodref : 150 { 151 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 152 u2 class_index = cfs->get_u2_fast(); 153 u2 name_and_type_index = cfs->get_u2_fast(); 154 _cp->interface_method_at_put(index, class_index, name_and_type_index); 155 } 156 break; 157 case JVM_CONSTANT_String : 158 { 159 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 160 u2 string_index = cfs->get_u2_fast(); 161 _cp->string_index_at_put(index, string_index); 162 } 163 break; 164 case JVM_CONSTANT_MethodHandle : 165 case JVM_CONSTANT_MethodType : 166 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 167 classfile_parse_error( 168 "Class file version does not support constant tag %u in class file %s", 169 tag, CHECK); 170 } 171 if (tag == JVM_CONSTANT_MethodHandle) { 172 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 173 u1 ref_kind = cfs->get_u1_fast(); 174 u2 method_index = cfs->get_u2_fast(); 175 _cp->method_handle_index_at_put(index, ref_kind, method_index); 176 } else if (tag == JVM_CONSTANT_MethodType) { 177 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 178 u2 signature_index = cfs->get_u2_fast(); 179 _cp->method_type_index_at_put(index, signature_index); 180 } else { 181 ShouldNotReachHere(); 182 } 183 break; 184 case JVM_CONSTANT_InvokeDynamic : 185 { 186 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 187 classfile_parse_error( 188 "Class file version does not support constant tag %u in class file %s", 189 tag, CHECK); 190 } 191 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 192 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 193 u2 name_and_type_index = cfs->get_u2_fast(); 194 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 195 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 196 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 197 } 198 break; 199 case JVM_CONSTANT_Integer : 200 { 201 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 202 u4 bytes = cfs->get_u4_fast(); 203 _cp->int_at_put(index, (jint) bytes); 204 } 205 break; 206 case JVM_CONSTANT_Float : 207 { 208 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 209 u4 bytes = cfs->get_u4_fast(); 210 _cp->float_at_put(index, *(jfloat*)&bytes); 211 } 212 break; 213 case JVM_CONSTANT_Long : 214 // A mangled type might cause you to overrun allocated memory 215 guarantee_property(index+1 < length, 216 "Invalid constant pool entry %u in class file %s", 217 index, CHECK); 218 { 219 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 220 u8 bytes = cfs->get_u8_fast(); 221 _cp->long_at_put(index, bytes); 222 } 223 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 224 break; 225 case JVM_CONSTANT_Double : 226 // A mangled type might cause you to overrun allocated memory 227 guarantee_property(index+1 < length, 228 "Invalid constant pool entry %u in class file %s", 229 index, CHECK); 230 { 231 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 232 u8 bytes = cfs->get_u8_fast(); 233 _cp->double_at_put(index, *(jdouble*)&bytes); 234 } 235 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 236 break; 237 case JVM_CONSTANT_NameAndType : 238 { 239 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 240 u2 name_index = cfs->get_u2_fast(); 241 u2 signature_index = cfs->get_u2_fast(); 242 _cp->name_and_type_at_put(index, name_index, signature_index); 243 } 244 break; 245 case JVM_CONSTANT_Utf8 : 246 { 247 cfs->guarantee_more(2, CHECK); // utf8_length 248 u2 utf8_length = cfs->get_u2_fast(); 249 u1* utf8_buffer = cfs->get_u1_buffer(); 250 assert(utf8_buffer != NULL, "null utf8 buffer"); 251 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 252 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 253 cfs->skip_u1_fast(utf8_length); 254 255 // Before storing the symbol, make sure it's legal 256 if (_need_verify) { 257 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 258 } 259 260 if (has_cp_patch_at(index)) { 261 Handle patch = clear_cp_patch_at(index); 262 guarantee_property(java_lang_String::is_instance(patch()), 263 "Illegal utf8 patch at %d in class file %s", 264 index, CHECK); 265 char* str = java_lang_String::as_utf8_string(patch()); 266 // (could use java_lang_String::as_symbol instead, but might as well batch them) 267 utf8_buffer = (u1*) str; 268 utf8_length = (int) strlen(str); 269 } 270 271 unsigned int hash; 272 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 273 if (result == NULL) { 274 names[names_count] = (char*)utf8_buffer; 275 lengths[names_count] = utf8_length; 276 indices[names_count] = index; 277 hashValues[names_count++] = hash; 278 if (names_count == SymbolTable::symbol_alloc_batch_size) { 279 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 280 names_count = 0; 281 } 282 } else { 283 _cp->symbol_at_put(index, result); 284 } 285 } 286 break; 287 default: 288 classfile_parse_error( 289 "Unknown constant tag %u in class file %s", tag, CHECK); 290 break; 291 } 292 } 293 294 // Allocate the remaining symbols 295 if (names_count > 0) { 296 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 297 } 298 299 // Copy _current pointer of local copy back to stream(). 300 #ifdef ASSERT 301 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 302 #endif 303 cfs0->set_current(cfs1.current()); 304 } 305 306 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 307 308 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 309 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 310 return cp->symbol_at(index); 311 else 312 return NULL; 313 } 314 315 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 316 ClassFileStream* cfs = stream(); 317 constantPoolHandle nullHandle; 318 319 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 320 u2 length = cfs->get_u2_fast(); 321 guarantee_property( 322 length >= 1, "Illegal constant pool size %u in class file %s", 323 length, CHECK_(nullHandle)); 324 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 325 CHECK_(nullHandle)); 326 _cp = constant_pool; // save in case of errors 327 constantPoolHandle cp (THREAD, constant_pool); 328 329 // parsing constant pool entries 330 parse_constant_pool_entries(length, CHECK_(nullHandle)); 331 332 int index = 1; // declared outside of loops for portability 333 334 // first verification pass - validate cross references and fixup class and string constants 335 for (index = 1; index < length; index++) { // Index 0 is unused 336 jbyte tag = cp->tag_at(index).value(); 337 switch (tag) { 338 case JVM_CONSTANT_Class : 339 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 340 break; 341 case JVM_CONSTANT_Fieldref : 342 // fall through 343 case JVM_CONSTANT_Methodref : 344 // fall through 345 case JVM_CONSTANT_InterfaceMethodref : { 346 if (!_need_verify) break; 347 int klass_ref_index = cp->klass_ref_index_at(index); 348 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 349 check_property(valid_klass_reference_at(klass_ref_index), 350 "Invalid constant pool index %u in class file %s", 351 klass_ref_index, 352 CHECK_(nullHandle)); 353 check_property(valid_cp_range(name_and_type_ref_index, length) && 354 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 355 "Invalid constant pool index %u in class file %s", 356 name_and_type_ref_index, 357 CHECK_(nullHandle)); 358 break; 359 } 360 case JVM_CONSTANT_String : 361 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 362 break; 363 case JVM_CONSTANT_Integer : 364 break; 365 case JVM_CONSTANT_Float : 366 break; 367 case JVM_CONSTANT_Long : 368 case JVM_CONSTANT_Double : 369 index++; 370 check_property( 371 (index < length && cp->tag_at(index).is_invalid()), 372 "Improper constant pool long/double index %u in class file %s", 373 index, CHECK_(nullHandle)); 374 break; 375 case JVM_CONSTANT_NameAndType : { 376 if (!_need_verify) break; 377 int name_ref_index = cp->name_ref_index_at(index); 378 int signature_ref_index = cp->signature_ref_index_at(index); 379 check_property(valid_symbol_at(name_ref_index), 380 "Invalid constant pool index %u in class file %s", 381 name_ref_index, CHECK_(nullHandle)); 382 check_property(valid_symbol_at(signature_ref_index), 383 "Invalid constant pool index %u in class file %s", 384 signature_ref_index, CHECK_(nullHandle)); 385 break; 386 } 387 case JVM_CONSTANT_Utf8 : 388 break; 389 case JVM_CONSTANT_UnresolvedClass : // fall-through 390 case JVM_CONSTANT_UnresolvedClassInError: 391 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 392 break; 393 case JVM_CONSTANT_ClassIndex : 394 { 395 int class_index = cp->klass_index_at(index); 396 check_property(valid_symbol_at(class_index), 397 "Invalid constant pool index %u in class file %s", 398 class_index, CHECK_(nullHandle)); 399 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 400 } 401 break; 402 case JVM_CONSTANT_StringIndex : 403 { 404 int string_index = cp->string_index_at(index); 405 check_property(valid_symbol_at(string_index), 406 "Invalid constant pool index %u in class file %s", 407 string_index, CHECK_(nullHandle)); 408 Symbol* sym = cp->symbol_at(string_index); 409 cp->unresolved_string_at_put(index, sym); 410 } 411 break; 412 case JVM_CONSTANT_MethodHandle : 413 { 414 int ref_index = cp->method_handle_index_at(index); 415 check_property( 416 valid_cp_range(ref_index, length), 417 "Invalid constant pool index %u in class file %s", 418 ref_index, CHECK_(nullHandle)); 419 constantTag tag = cp->tag_at(ref_index); 420 int ref_kind = cp->method_handle_ref_kind_at(index); 421 switch (ref_kind) { 422 case JVM_REF_getField: 423 case JVM_REF_getStatic: 424 case JVM_REF_putField: 425 case JVM_REF_putStatic: 426 check_property( 427 tag.is_field(), 428 "Invalid constant pool index %u in class file %s (not a field)", 429 ref_index, CHECK_(nullHandle)); 430 break; 431 case JVM_REF_invokeVirtual: 432 case JVM_REF_newInvokeSpecial: 433 check_property( 434 tag.is_method(), 435 "Invalid constant pool index %u in class file %s (not a method)", 436 ref_index, CHECK_(nullHandle)); 437 break; 438 case JVM_REF_invokeStatic: 439 case JVM_REF_invokeSpecial: 440 check_property(tag.is_method() || 441 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 442 "Invalid constant pool index %u in class file %s (not a method)", 443 ref_index, CHECK_(nullHandle)); 444 break; 445 case JVM_REF_invokeInterface: 446 check_property( 447 tag.is_interface_method(), 448 "Invalid constant pool index %u in class file %s (not an interface method)", 449 ref_index, CHECK_(nullHandle)); 450 break; 451 default: 452 classfile_parse_error( 453 "Bad method handle kind at constant pool index %u in class file %s", 454 index, CHECK_(nullHandle)); 455 } 456 // Keep the ref_index unchanged. It will be indirected at link-time. 457 } 458 break; 459 case JVM_CONSTANT_MethodType : 460 { 461 int ref_index = cp->method_type_index_at(index); 462 check_property(valid_symbol_at(ref_index), 463 "Invalid constant pool index %u in class file %s", 464 ref_index, CHECK_(nullHandle)); 465 } 466 break; 467 case JVM_CONSTANT_InvokeDynamic : 468 { 469 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 470 check_property(valid_cp_range(name_and_type_ref_index, length) && 471 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 472 "Invalid constant pool index %u in class file %s", 473 name_and_type_ref_index, 474 CHECK_(nullHandle)); 475 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 476 break; 477 } 478 default: 479 fatal(err_msg("bad constant pool tag value %u", 480 cp->tag_at(index).value())); 481 ShouldNotReachHere(); 482 break; 483 } // end of switch 484 } // end of for 485 486 if (_cp_patches != NULL) { 487 // need to treat this_class specially... 488 int this_class_index; 489 { 490 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 491 u1* mark = cfs->current(); 492 u2 flags = cfs->get_u2_fast(); 493 this_class_index = cfs->get_u2_fast(); 494 cfs->set_current(mark); // revert to mark 495 } 496 497 for (index = 1; index < length; index++) { // Index 0 is unused 498 if (has_cp_patch_at(index)) { 499 guarantee_property(index != this_class_index, 500 "Illegal constant pool patch to self at %d in class file %s", 501 index, CHECK_(nullHandle)); 502 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 503 } 504 } 505 } 506 507 if (!_need_verify) { 508 return cp; 509 } 510 511 // second verification pass - checks the strings are of the right format. 512 // but not yet to the other entries 513 for (index = 1; index < length; index++) { 514 jbyte tag = cp->tag_at(index).value(); 515 switch (tag) { 516 case JVM_CONSTANT_UnresolvedClass: { 517 Symbol* class_name = cp->klass_name_at(index); 518 // check the name, even if _cp_patches will overwrite it 519 verify_legal_class_name(class_name, CHECK_(nullHandle)); 520 break; 521 } 522 case JVM_CONSTANT_NameAndType: { 523 if (_need_verify && _major_version >= JAVA_7_VERSION) { 524 int sig_index = cp->signature_ref_index_at(index); 525 int name_index = cp->name_ref_index_at(index); 526 Symbol* name = cp->symbol_at(name_index); 527 Symbol* sig = cp->symbol_at(sig_index); 528 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 529 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 530 } else { 531 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 532 } 533 } 534 break; 535 } 536 case JVM_CONSTANT_InvokeDynamic: 537 case JVM_CONSTANT_Fieldref: 538 case JVM_CONSTANT_Methodref: 539 case JVM_CONSTANT_InterfaceMethodref: { 540 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 541 // already verified to be utf8 542 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 543 // already verified to be utf8 544 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 545 Symbol* name = cp->symbol_at(name_ref_index); 546 Symbol* signature = cp->symbol_at(signature_ref_index); 547 if (tag == JVM_CONSTANT_Fieldref) { 548 verify_legal_field_name(name, CHECK_(nullHandle)); 549 if (_need_verify && _major_version >= JAVA_7_VERSION) { 550 // Signature is verified above, when iterating NameAndType_info. 551 // Need only to be sure it's the right type. 552 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 553 throwIllegalSignature( 554 "Field", name, signature, CHECK_(nullHandle)); 555 } 556 } else { 557 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 558 } 559 } else { 560 verify_legal_method_name(name, CHECK_(nullHandle)); 561 if (_need_verify && _major_version >= JAVA_7_VERSION) { 562 // Signature is verified above, when iterating NameAndType_info. 563 // Need only to be sure it's the right type. 564 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 565 throwIllegalSignature( 566 "Method", name, signature, CHECK_(nullHandle)); 567 } 568 } else { 569 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 570 } 571 if (tag == JVM_CONSTANT_Methodref) { 572 // 4509014: If a class method name begins with '<', it must be "<init>". 573 assert(name != NULL, "method name in constant pool is null"); 574 unsigned int name_len = name->utf8_length(); 575 assert(name_len > 0, "bad method name"); // already verified as legal name 576 if (name->byte_at(0) == '<') { 577 if (name != vmSymbols::object_initializer_name()) { 578 classfile_parse_error( 579 "Bad method name at constant pool index %u in class file %s", 580 name_ref_index, CHECK_(nullHandle)); 581 } 582 } 583 } 584 } 585 break; 586 } 587 case JVM_CONSTANT_MethodHandle: { 588 int ref_index = cp->method_handle_index_at(index); 589 int ref_kind = cp->method_handle_ref_kind_at(index); 590 switch (ref_kind) { 591 case JVM_REF_invokeVirtual: 592 case JVM_REF_invokeStatic: 593 case JVM_REF_invokeSpecial: 594 case JVM_REF_newInvokeSpecial: 595 { 596 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 597 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 598 Symbol* name = cp->symbol_at(name_ref_index); 599 if (ref_kind == JVM_REF_newInvokeSpecial) { 600 if (name != vmSymbols::object_initializer_name()) { 601 classfile_parse_error( 602 "Bad constructor name at constant pool index %u in class file %s", 603 name_ref_index, CHECK_(nullHandle)); 604 } 605 } else { 606 if (name == vmSymbols::object_initializer_name()) { 607 classfile_parse_error( 608 "Bad method name at constant pool index %u in class file %s", 609 name_ref_index, CHECK_(nullHandle)); 610 } 611 } 612 } 613 break; 614 // Other ref_kinds are already fully checked in previous pass. 615 } 616 break; 617 } 618 case JVM_CONSTANT_MethodType: { 619 Symbol* no_name = vmSymbols::type_name(); // place holder 620 Symbol* signature = cp->method_type_signature_at(index); 621 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 622 break; 623 } 624 case JVM_CONSTANT_Utf8: { 625 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 626 } 627 } // end of switch 628 } // end of for 629 630 return cp; 631 } 632 633 634 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 635 BasicType patch_type = T_VOID; 636 637 switch (cp->tag_at(index).value()) { 638 639 case JVM_CONSTANT_UnresolvedClass : 640 // Patching a class means pre-resolving it. 641 // The name in the constant pool is ignored. 642 if (java_lang_Class::is_instance(patch())) { 643 guarantee_property(!java_lang_Class::is_primitive(patch()), 644 "Illegal class patch at %d in class file %s", 645 index, CHECK); 646 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 647 } else { 648 guarantee_property(java_lang_String::is_instance(patch()), 649 "Illegal class patch at %d in class file %s", 650 index, CHECK); 651 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 652 cp->unresolved_klass_at_put(index, name); 653 } 654 break; 655 656 case JVM_CONSTANT_String : 657 // skip this patch and don't clear it. Needs the oop array for resolved 658 // references to be created first. 659 return; 660 661 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 662 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 663 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 664 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 665 patch_prim: 666 { 667 jvalue value; 668 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 669 guarantee_property(value_type == patch_type, 670 "Illegal primitive patch at %d in class file %s", 671 index, CHECK); 672 switch (value_type) { 673 case T_INT: cp->int_at_put(index, value.i); break; 674 case T_FLOAT: cp->float_at_put(index, value.f); break; 675 case T_LONG: cp->long_at_put(index, value.j); break; 676 case T_DOUBLE: cp->double_at_put(index, value.d); break; 677 default: assert(false, ""); 678 } 679 } 680 break; 681 682 default: 683 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 684 guarantee_property(!has_cp_patch_at(index), 685 "Illegal unexpected patch at %d in class file %s", 686 index, CHECK); 687 return; 688 } 689 690 // On fall-through, mark the patch as used. 691 clear_cp_patch_at(index); 692 } 693 694 695 696 class NameSigHash: public ResourceObj { 697 public: 698 Symbol* _name; // name 699 Symbol* _sig; // signature 700 NameSigHash* _next; // Next entry in hash table 701 }; 702 703 704 #define HASH_ROW_SIZE 256 705 706 unsigned int hash(Symbol* name, Symbol* sig) { 707 unsigned int raw_hash = 0; 708 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 709 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 710 711 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 712 } 713 714 715 void initialize_hashtable(NameSigHash** table) { 716 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 717 } 718 719 // Return false if the name/sig combination is found in table. 720 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 721 // The old format checker uses heap sort to find duplicates. 722 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 723 // of table since we don't expect Symbol*'s to move. 724 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 725 assert(name != NULL, "name in constant pool is NULL"); 726 727 // First lookup for duplicates 728 int index = hash(name, sig); 729 NameSigHash* entry = table[index]; 730 while (entry != NULL) { 731 if (entry->_name == name && entry->_sig == sig) { 732 return false; 733 } 734 entry = entry->_next; 735 } 736 737 // No duplicate is found, allocate a new entry and fill it. 738 entry = new NameSigHash(); 739 entry->_name = name; 740 entry->_sig = sig; 741 742 // Insert into hash table 743 entry->_next = table[index]; 744 table[index] = entry; 745 746 return true; 747 } 748 749 750 Array<Klass*>* ClassFileParser::parse_interfaces(int length, 751 Handle protection_domain, 752 Symbol* class_name, 753 bool* has_default_methods, 754 TRAPS) { 755 if (length == 0) { 756 _local_interfaces = Universe::the_empty_klass_array(); 757 } else { 758 ClassFileStream* cfs = stream(); 759 assert(length > 0, "only called for length>0"); 760 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 761 762 int index; 763 for (index = 0; index < length; index++) { 764 u2 interface_index = cfs->get_u2(CHECK_NULL); 765 KlassHandle interf; 766 check_property( 767 valid_klass_reference_at(interface_index), 768 "Interface name has bad constant pool index %u in class file %s", 769 interface_index, CHECK_NULL); 770 if (_cp->tag_at(interface_index).is_klass()) { 771 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 772 } else { 773 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 774 775 // Don't need to check legal name because it's checked when parsing constant pool. 776 // But need to make sure it's not an array type. 777 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 778 "Bad interface name in class file %s", CHECK_NULL); 779 Handle class_loader(THREAD, _loader_data->class_loader()); 780 781 // Call resolve_super so classcircularity is checked 782 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 783 unresolved_klass, class_loader, protection_domain, 784 false, CHECK_NULL); 785 interf = KlassHandle(THREAD, k); 786 } 787 788 if (!interf()->is_interface()) { 789 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 790 } 791 if (InstanceKlass::cast(interf())->has_default_methods()) { 792 *has_default_methods = true; 793 } 794 _local_interfaces->at_put(index, interf()); 795 } 796 797 if (!_need_verify || length <= 1) { 798 return _local_interfaces; 799 } 800 801 // Check if there's any duplicates in interfaces 802 ResourceMark rm(THREAD); 803 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 804 THREAD, NameSigHash*, HASH_ROW_SIZE); 805 initialize_hashtable(interface_names); 806 bool dup = false; 807 { 808 debug_only(No_Safepoint_Verifier nsv;) 809 for (index = 0; index < length; index++) { 810 Klass* k = _local_interfaces->at(index); 811 Symbol* name = InstanceKlass::cast(k)->name(); 812 // If no duplicates, add (name, NULL) in hashtable interface_names. 813 if (!put_after_lookup(name, NULL, interface_names)) { 814 dup = true; 815 break; 816 } 817 } 818 } 819 if (dup) { 820 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); 821 } 822 } 823 return _local_interfaces; 824 } 825 826 827 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 828 // Make sure the constant pool entry is of a type appropriate to this field 829 guarantee_property( 830 (constantvalue_index > 0 && 831 constantvalue_index < _cp->length()), 832 "Bad initial value index %u in ConstantValue attribute in class file %s", 833 constantvalue_index, CHECK); 834 constantTag value_type = _cp->tag_at(constantvalue_index); 835 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 836 case T_LONG: 837 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 838 break; 839 case T_FLOAT: 840 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 841 break; 842 case T_DOUBLE: 843 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 844 break; 845 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 846 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 847 break; 848 case T_OBJECT: 849 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 850 && value_type.is_string()), 851 "Bad string initial value in class file %s", CHECK); 852 break; 853 default: 854 classfile_parse_error( 855 "Unable to set initial value %u in class file %s", 856 constantvalue_index, CHECK); 857 } 858 } 859 860 861 // Parse attributes for a field. 862 void ClassFileParser::parse_field_attributes(u2 attributes_count, 863 bool is_static, u2 signature_index, 864 u2* constantvalue_index_addr, 865 bool* is_synthetic_addr, 866 u2* generic_signature_index_addr, 867 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 868 TRAPS) { 869 ClassFileStream* cfs = stream(); 870 assert(attributes_count > 0, "length should be greater than 0"); 871 u2 constantvalue_index = 0; 872 u2 generic_signature_index = 0; 873 bool is_synthetic = false; 874 u1* runtime_visible_annotations = NULL; 875 int runtime_visible_annotations_length = 0; 876 u1* runtime_invisible_annotations = NULL; 877 int runtime_invisible_annotations_length = 0; 878 u1* runtime_visible_type_annotations = NULL; 879 int runtime_visible_type_annotations_length = 0; 880 u1* runtime_invisible_type_annotations = NULL; 881 int runtime_invisible_type_annotations_length = 0; 882 bool runtime_invisible_annotations_exists = false; 883 bool runtime_invisible_type_annotations_exists = false; 884 while (attributes_count--) { 885 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 886 u2 attribute_name_index = cfs->get_u2_fast(); 887 u4 attribute_length = cfs->get_u4_fast(); 888 check_property(valid_symbol_at(attribute_name_index), 889 "Invalid field attribute index %u in class file %s", 890 attribute_name_index, 891 CHECK); 892 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 893 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 894 // ignore if non-static 895 if (constantvalue_index != 0) { 896 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 897 } 898 check_property( 899 attribute_length == 2, 900 "Invalid ConstantValue field attribute length %u in class file %s", 901 attribute_length, CHECK); 902 constantvalue_index = cfs->get_u2(CHECK); 903 if (_need_verify) { 904 verify_constantvalue(constantvalue_index, signature_index, CHECK); 905 } 906 } else if (attribute_name == vmSymbols::tag_synthetic()) { 907 if (attribute_length != 0) { 908 classfile_parse_error( 909 "Invalid Synthetic field attribute length %u in class file %s", 910 attribute_length, CHECK); 911 } 912 is_synthetic = true; 913 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 914 if (attribute_length != 0) { 915 classfile_parse_error( 916 "Invalid Deprecated field attribute length %u in class file %s", 917 attribute_length, CHECK); 918 } 919 } else if (_major_version >= JAVA_1_5_VERSION) { 920 if (attribute_name == vmSymbols::tag_signature()) { 921 if (attribute_length != 2) { 922 classfile_parse_error( 923 "Wrong size %u for field's Signature attribute in class file %s", 924 attribute_length, CHECK); 925 } 926 generic_signature_index = parse_generic_signature_attribute(CHECK); 927 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 928 if (runtime_visible_annotations != NULL) { 929 classfile_parse_error( 930 "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", CHECK); 931 } 932 runtime_visible_annotations_length = attribute_length; 933 runtime_visible_annotations = cfs->get_u1_buffer(); 934 assert(runtime_visible_annotations != NULL, "null visible annotations"); 935 parse_annotations(runtime_visible_annotations, 936 runtime_visible_annotations_length, 937 parsed_annotations, 938 CHECK); 939 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 940 } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 941 if (runtime_invisible_annotations_exists) { 942 classfile_parse_error( 943 "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", CHECK); 944 } 945 runtime_invisible_annotations_exists = true; 946 if (PreserveAllAnnotations) { 947 runtime_invisible_annotations_length = attribute_length; 948 runtime_invisible_annotations = cfs->get_u1_buffer(); 949 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 950 } 951 cfs->skip_u1(attribute_length, CHECK); 952 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 953 if (runtime_visible_type_annotations != NULL) { 954 classfile_parse_error( 955 "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", CHECK); 956 } 957 runtime_visible_type_annotations_length = attribute_length; 958 runtime_visible_type_annotations = cfs->get_u1_buffer(); 959 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 960 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 961 } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 962 if (runtime_invisible_type_annotations_exists) { 963 classfile_parse_error( 964 "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", CHECK); 965 } else { 966 runtime_invisible_type_annotations_exists = true; 967 } 968 if (PreserveAllAnnotations) { 969 runtime_invisible_type_annotations_length = attribute_length; 970 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 971 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 972 } 973 cfs->skip_u1(attribute_length, CHECK); 974 } else { 975 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 976 } 977 } else { 978 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 979 } 980 } 981 982 *constantvalue_index_addr = constantvalue_index; 983 *is_synthetic_addr = is_synthetic; 984 *generic_signature_index_addr = generic_signature_index; 985 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 986 runtime_visible_annotations_length, 987 runtime_invisible_annotations, 988 runtime_invisible_annotations_length, 989 CHECK); 990 parsed_annotations->set_field_annotations(a); 991 a = assemble_annotations(runtime_visible_type_annotations, 992 runtime_visible_type_annotations_length, 993 runtime_invisible_type_annotations, 994 runtime_invisible_type_annotations_length, 995 CHECK); 996 parsed_annotations->set_field_type_annotations(a); 997 return; 998 } 999 1000 1001 // Field allocation types. Used for computing field offsets. 1002 1003 enum FieldAllocationType { 1004 STATIC_OOP, // Oops 1005 STATIC_BYTE, // Boolean, Byte, char 1006 STATIC_SHORT, // shorts 1007 STATIC_WORD, // ints 1008 STATIC_DOUBLE, // aligned long or double 1009 NONSTATIC_OOP, 1010 NONSTATIC_BYTE, 1011 NONSTATIC_SHORT, 1012 NONSTATIC_WORD, 1013 NONSTATIC_DOUBLE, 1014 MAX_FIELD_ALLOCATION_TYPE, 1015 BAD_ALLOCATION_TYPE = -1 1016 }; 1017 1018 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1019 BAD_ALLOCATION_TYPE, // 0 1020 BAD_ALLOCATION_TYPE, // 1 1021 BAD_ALLOCATION_TYPE, // 2 1022 BAD_ALLOCATION_TYPE, // 3 1023 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1024 NONSTATIC_SHORT, // T_CHAR = 5, 1025 NONSTATIC_WORD, // T_FLOAT = 6, 1026 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1027 NONSTATIC_BYTE, // T_BYTE = 8, 1028 NONSTATIC_SHORT, // T_SHORT = 9, 1029 NONSTATIC_WORD, // T_INT = 10, 1030 NONSTATIC_DOUBLE, // T_LONG = 11, 1031 NONSTATIC_OOP, // T_OBJECT = 12, 1032 NONSTATIC_OOP, // T_ARRAY = 13, 1033 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1034 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1035 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1036 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1037 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1038 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1039 BAD_ALLOCATION_TYPE, // 0 1040 BAD_ALLOCATION_TYPE, // 1 1041 BAD_ALLOCATION_TYPE, // 2 1042 BAD_ALLOCATION_TYPE, // 3 1043 STATIC_BYTE , // T_BOOLEAN = 4, 1044 STATIC_SHORT, // T_CHAR = 5, 1045 STATIC_WORD, // T_FLOAT = 6, 1046 STATIC_DOUBLE, // T_DOUBLE = 7, 1047 STATIC_BYTE, // T_BYTE = 8, 1048 STATIC_SHORT, // T_SHORT = 9, 1049 STATIC_WORD, // T_INT = 10, 1050 STATIC_DOUBLE, // T_LONG = 11, 1051 STATIC_OOP, // T_OBJECT = 12, 1052 STATIC_OOP, // T_ARRAY = 13, 1053 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1054 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1055 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1056 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1057 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1058 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1059 }; 1060 1061 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1062 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1063 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1064 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1065 return result; 1066 } 1067 1068 class FieldAllocationCount: public ResourceObj { 1069 public: 1070 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1071 1072 FieldAllocationCount() { 1073 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1074 count[i] = 0; 1075 } 1076 } 1077 1078 FieldAllocationType update(bool is_static, BasicType type) { 1079 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1080 // Make sure there is no overflow with injected fields. 1081 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1082 count[atype]++; 1083 return atype; 1084 } 1085 }; 1086 1087 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1088 bool is_interface, 1089 FieldAllocationCount *fac, 1090 u2* java_fields_count_ptr, TRAPS) { 1091 ClassFileStream* cfs = stream(); 1092 cfs->guarantee_more(2, CHECK_NULL); // length 1093 u2 length = cfs->get_u2_fast(); 1094 *java_fields_count_ptr = length; 1095 1096 int num_injected = 0; 1097 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1098 int total_fields = length + num_injected; 1099 1100 // The field array starts with tuples of shorts 1101 // [access, name index, sig index, initial value index, byte offset]. 1102 // A generic signature slot only exists for field with generic 1103 // signature attribute. And the access flag is set with 1104 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1105 // signature slots are at the end of the field array and after all 1106 // other fields data. 1107 // 1108 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1109 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1110 // ... 1111 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1112 // [generic signature index] 1113 // [generic signature index] 1114 // ... 1115 // 1116 // Allocate a temporary resource array for field data. For each field, 1117 // a slot is reserved in the temporary array for the generic signature 1118 // index. After parsing all fields, the data are copied to a permanent 1119 // array and any unused slots will be discarded. 1120 ResourceMark rm(THREAD); 1121 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1122 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1123 1124 // The generic signature slots start after all other fields' data. 1125 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1126 int num_generic_signature = 0; 1127 for (int n = 0; n < length; n++) { 1128 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1129 1130 AccessFlags access_flags; 1131 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1132 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1133 access_flags.set_flags(flags); 1134 1135 u2 name_index = cfs->get_u2_fast(); 1136 int cp_size = _cp->length(); 1137 check_property(valid_symbol_at(name_index), 1138 "Invalid constant pool index %u for field name in class file %s", 1139 name_index, 1140 CHECK_NULL); 1141 Symbol* name = _cp->symbol_at(name_index); 1142 verify_legal_field_name(name, CHECK_NULL); 1143 1144 u2 signature_index = cfs->get_u2_fast(); 1145 check_property(valid_symbol_at(signature_index), 1146 "Invalid constant pool index %u for field signature in class file %s", 1147 signature_index, CHECK_NULL); 1148 Symbol* sig = _cp->symbol_at(signature_index); 1149 verify_legal_field_signature(name, sig, CHECK_NULL); 1150 1151 u2 constantvalue_index = 0; 1152 bool is_synthetic = false; 1153 u2 generic_signature_index = 0; 1154 bool is_static = access_flags.is_static(); 1155 FieldAnnotationCollector parsed_annotations(_loader_data); 1156 1157 u2 attributes_count = cfs->get_u2_fast(); 1158 if (attributes_count > 0) { 1159 parse_field_attributes(attributes_count, is_static, signature_index, 1160 &constantvalue_index, &is_synthetic, 1161 &generic_signature_index, &parsed_annotations, 1162 CHECK_NULL); 1163 if (parsed_annotations.field_annotations() != NULL) { 1164 if (_fields_annotations == NULL) { 1165 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1166 _loader_data, length, NULL, 1167 CHECK_NULL); 1168 } 1169 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1170 parsed_annotations.set_field_annotations(NULL); 1171 } 1172 if (parsed_annotations.field_type_annotations() != NULL) { 1173 if (_fields_type_annotations == NULL) { 1174 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1175 _loader_data, length, NULL, 1176 CHECK_NULL); 1177 } 1178 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1179 parsed_annotations.set_field_type_annotations(NULL); 1180 } 1181 1182 if (is_synthetic) { 1183 access_flags.set_is_synthetic(); 1184 } 1185 if (generic_signature_index != 0) { 1186 access_flags.set_field_has_generic_signature(); 1187 fa[generic_signature_slot] = generic_signature_index; 1188 generic_signature_slot ++; 1189 num_generic_signature ++; 1190 } 1191 } 1192 1193 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1194 field->initialize(access_flags.as_short(), 1195 name_index, 1196 signature_index, 1197 constantvalue_index); 1198 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1199 1200 // Remember how many oops we encountered and compute allocation type 1201 FieldAllocationType atype = fac->update(is_static, type); 1202 field->set_allocation_type(atype); 1203 1204 // After field is initialized with type, we can augment it with aux info 1205 if (parsed_annotations.has_any_annotations()) 1206 parsed_annotations.apply_to(field); 1207 } 1208 1209 int index = length; 1210 if (num_injected != 0) { 1211 for (int n = 0; n < num_injected; n++) { 1212 // Check for duplicates 1213 if (injected[n].may_be_java) { 1214 Symbol* name = injected[n].name(); 1215 Symbol* signature = injected[n].signature(); 1216 bool duplicate = false; 1217 for (int i = 0; i < length; i++) { 1218 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1219 if (name == _cp->symbol_at(f->name_index()) && 1220 signature == _cp->symbol_at(f->signature_index())) { 1221 // Symbol is desclared in Java so skip this one 1222 duplicate = true; 1223 break; 1224 } 1225 } 1226 if (duplicate) { 1227 // These will be removed from the field array at the end 1228 continue; 1229 } 1230 } 1231 1232 // Injected field 1233 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1234 field->initialize(JVM_ACC_FIELD_INTERNAL, 1235 injected[n].name_index, 1236 injected[n].signature_index, 1237 0); 1238 1239 BasicType type = FieldType::basic_type(injected[n].signature()); 1240 1241 // Remember how many oops we encountered and compute allocation type 1242 FieldAllocationType atype = fac->update(false, type); 1243 field->set_allocation_type(atype); 1244 index++; 1245 } 1246 } 1247 1248 // Now copy the fields' data from the temporary resource array. 1249 // Sometimes injected fields already exist in the Java source so 1250 // the fields array could be too long. In that case the 1251 // fields array is trimed. Also unused slots that were reserved 1252 // for generic signature indexes are discarded. 1253 Array<u2>* fields = MetadataFactory::new_array<u2>( 1254 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1255 CHECK_NULL); 1256 _fields = fields; // save in case of error 1257 { 1258 int i = 0; 1259 for (; i < index * FieldInfo::field_slots; i++) { 1260 fields->at_put(i, fa[i]); 1261 } 1262 for (int j = total_fields * FieldInfo::field_slots; 1263 j < generic_signature_slot; j++) { 1264 fields->at_put(i++, fa[j]); 1265 } 1266 assert(i == fields->length(), ""); 1267 } 1268 1269 if (_need_verify && length > 1) { 1270 // Check duplicated fields 1271 ResourceMark rm(THREAD); 1272 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1273 THREAD, NameSigHash*, HASH_ROW_SIZE); 1274 initialize_hashtable(names_and_sigs); 1275 bool dup = false; 1276 { 1277 debug_only(No_Safepoint_Verifier nsv;) 1278 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1279 Symbol* name = fs.name(); 1280 Symbol* sig = fs.signature(); 1281 // If no duplicates, add name/signature in hashtable names_and_sigs. 1282 if (!put_after_lookup(name, sig, names_and_sigs)) { 1283 dup = true; 1284 break; 1285 } 1286 } 1287 } 1288 if (dup) { 1289 classfile_parse_error("Duplicate field name&signature in class file %s", 1290 CHECK_NULL); 1291 } 1292 } 1293 1294 return fields; 1295 } 1296 1297 1298 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1299 while (length-- > 0) { 1300 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1301 } 1302 } 1303 1304 1305 u2* ClassFileParser::parse_exception_table(u4 code_length, 1306 u4 exception_table_length, 1307 TRAPS) { 1308 ClassFileStream* cfs = stream(); 1309 1310 u2* exception_table_start = cfs->get_u2_buffer(); 1311 assert(exception_table_start != NULL, "null exception table"); 1312 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1313 // Will check legal target after parsing code array in verifier. 1314 if (_need_verify) { 1315 for (unsigned int i = 0; i < exception_table_length; i++) { 1316 u2 start_pc = cfs->get_u2_fast(); 1317 u2 end_pc = cfs->get_u2_fast(); 1318 u2 handler_pc = cfs->get_u2_fast(); 1319 u2 catch_type_index = cfs->get_u2_fast(); 1320 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1321 "Illegal exception table range in class file %s", 1322 CHECK_NULL); 1323 guarantee_property(handler_pc < code_length, 1324 "Illegal exception table handler in class file %s", 1325 CHECK_NULL); 1326 if (catch_type_index != 0) { 1327 guarantee_property(valid_klass_reference_at(catch_type_index), 1328 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1329 } 1330 } 1331 } else { 1332 cfs->skip_u2_fast(exception_table_length * 4); 1333 } 1334 return exception_table_start; 1335 } 1336 1337 void ClassFileParser::parse_linenumber_table( 1338 u4 code_attribute_length, u4 code_length, 1339 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1340 ClassFileStream* cfs = stream(); 1341 unsigned int num_entries = cfs->get_u2(CHECK); 1342 1343 // Each entry is a u2 start_pc, and a u2 line_number 1344 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1345 1346 // Verify line number attribute and table length 1347 check_property( 1348 code_attribute_length == sizeof(u2) + length_in_bytes, 1349 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1350 1351 cfs->guarantee_more(length_in_bytes, CHECK); 1352 1353 if ((*write_stream) == NULL) { 1354 if (length_in_bytes > fixed_buffer_size) { 1355 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1356 } else { 1357 (*write_stream) = new CompressedLineNumberWriteStream( 1358 linenumbertable_buffer, fixed_buffer_size); 1359 } 1360 } 1361 1362 while (num_entries-- > 0) { 1363 u2 bci = cfs->get_u2_fast(); // start_pc 1364 u2 line = cfs->get_u2_fast(); // line_number 1365 guarantee_property(bci < code_length, 1366 "Invalid pc in LineNumberTable in class file %s", CHECK); 1367 (*write_stream)->write_pair(bci, line); 1368 } 1369 } 1370 1371 1372 // Class file LocalVariableTable elements. 1373 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1374 public: 1375 u2 start_bci; 1376 u2 length; 1377 u2 name_cp_index; 1378 u2 descriptor_cp_index; 1379 u2 slot; 1380 }; 1381 1382 1383 class LVT_Hash: public CHeapObj<mtClass> { 1384 public: 1385 LocalVariableTableElement *_elem; // element 1386 LVT_Hash* _next; // Next entry in hash table 1387 }; 1388 1389 unsigned int hash(LocalVariableTableElement *elem) { 1390 unsigned int raw_hash = elem->start_bci; 1391 1392 raw_hash = elem->length + raw_hash * 37; 1393 raw_hash = elem->name_cp_index + raw_hash * 37; 1394 raw_hash = elem->slot + raw_hash * 37; 1395 1396 return raw_hash % HASH_ROW_SIZE; 1397 } 1398 1399 void initialize_hashtable(LVT_Hash** table) { 1400 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1401 table[i] = NULL; 1402 } 1403 } 1404 1405 void clear_hashtable(LVT_Hash** table) { 1406 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1407 LVT_Hash* current = table[i]; 1408 LVT_Hash* next; 1409 while (current != NULL) { 1410 next = current->_next; 1411 current->_next = NULL; 1412 delete(current); 1413 current = next; 1414 } 1415 table[i] = NULL; 1416 } 1417 } 1418 1419 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1420 LVT_Hash* entry = table[index]; 1421 1422 /* 1423 * 3-tuple start_bci/length/slot has to be unique key, 1424 * so the following comparison seems to be redundant: 1425 * && elem->name_cp_index == entry->_elem->name_cp_index 1426 */ 1427 while (entry != NULL) { 1428 if (elem->start_bci == entry->_elem->start_bci 1429 && elem->length == entry->_elem->length 1430 && elem->name_cp_index == entry->_elem->name_cp_index 1431 && elem->slot == entry->_elem->slot 1432 ) { 1433 return entry; 1434 } 1435 entry = entry->_next; 1436 } 1437 return NULL; 1438 } 1439 1440 // Return false if the local variable is found in table. 1441 // Return true if no duplicate is found. 1442 // And local variable is added as a new entry in table. 1443 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1444 // First lookup for duplicates 1445 int index = hash(elem); 1446 LVT_Hash* entry = LVT_lookup(elem, index, table); 1447 1448 if (entry != NULL) { 1449 return false; 1450 } 1451 // No duplicate is found, allocate a new entry and fill it. 1452 if ((entry = new LVT_Hash()) == NULL) { 1453 return false; 1454 } 1455 entry->_elem = elem; 1456 1457 // Insert into hash table 1458 entry->_next = table[index]; 1459 table[index] = entry; 1460 1461 return true; 1462 } 1463 1464 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1465 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1466 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1467 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1468 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1469 lvt->signature_cp_index = 0; 1470 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1471 } 1472 1473 // Function is used to parse both attributes: 1474 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1475 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1476 u2 max_locals, 1477 u4 code_attribute_length, 1478 u2* localvariable_table_length, 1479 bool isLVTT, 1480 TRAPS) { 1481 ClassFileStream* cfs = stream(); 1482 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1483 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1484 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1485 // Verify local variable table attribute has right length 1486 if (_need_verify) { 1487 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1488 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1489 } 1490 u2* localvariable_table_start = cfs->get_u2_buffer(); 1491 assert(localvariable_table_start != NULL, "null local variable table"); 1492 if (!_need_verify) { 1493 cfs->skip_u2_fast(size); 1494 } else { 1495 cfs->guarantee_more(size * 2, CHECK_NULL); 1496 for(int i = 0; i < (*localvariable_table_length); i++) { 1497 u2 start_pc = cfs->get_u2_fast(); 1498 u2 length = cfs->get_u2_fast(); 1499 u2 name_index = cfs->get_u2_fast(); 1500 u2 descriptor_index = cfs->get_u2_fast(); 1501 u2 index = cfs->get_u2_fast(); 1502 // Assign to a u4 to avoid overflow 1503 u4 end_pc = (u4)start_pc + (u4)length; 1504 1505 if (start_pc >= code_length) { 1506 classfile_parse_error( 1507 "Invalid start_pc %u in %s in class file %s", 1508 start_pc, tbl_name, CHECK_NULL); 1509 } 1510 if (end_pc > code_length) { 1511 classfile_parse_error( 1512 "Invalid length %u in %s in class file %s", 1513 length, tbl_name, CHECK_NULL); 1514 } 1515 int cp_size = _cp->length(); 1516 guarantee_property(valid_symbol_at(name_index), 1517 "Name index %u in %s has bad constant type in class file %s", 1518 name_index, tbl_name, CHECK_NULL); 1519 guarantee_property(valid_symbol_at(descriptor_index), 1520 "Signature index %u in %s has bad constant type in class file %s", 1521 descriptor_index, tbl_name, CHECK_NULL); 1522 1523 Symbol* name = _cp->symbol_at(name_index); 1524 Symbol* sig = _cp->symbol_at(descriptor_index); 1525 verify_legal_field_name(name, CHECK_NULL); 1526 u2 extra_slot = 0; 1527 if (!isLVTT) { 1528 verify_legal_field_signature(name, sig, CHECK_NULL); 1529 1530 // 4894874: check special cases for double and long local variables 1531 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1532 sig == vmSymbols::type_signature(T_LONG)) { 1533 extra_slot = 1; 1534 } 1535 } 1536 guarantee_property((index + extra_slot) < max_locals, 1537 "Invalid index %u in %s in class file %s", 1538 index, tbl_name, CHECK_NULL); 1539 } 1540 } 1541 return localvariable_table_start; 1542 } 1543 1544 1545 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1546 u1* u1_array, u2* u2_array, TRAPS) { 1547 ClassFileStream* cfs = stream(); 1548 u2 index = 0; // index in the array with long/double occupying two slots 1549 u4 i1 = *u1_index; 1550 u4 i2 = *u2_index + 1; 1551 for(int i = 0; i < array_length; i++) { 1552 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1553 index++; 1554 if (tag == ITEM_Long || tag == ITEM_Double) { 1555 index++; 1556 } else if (tag == ITEM_Object) { 1557 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1558 guarantee_property(valid_klass_reference_at(class_index), 1559 "Bad class index %u in StackMap in class file %s", 1560 class_index, CHECK); 1561 } else if (tag == ITEM_Uninitialized) { 1562 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1563 guarantee_property( 1564 offset < code_length, 1565 "Bad uninitialized type offset %u in StackMap in class file %s", 1566 offset, CHECK); 1567 } else { 1568 guarantee_property( 1569 tag <= (u1)ITEM_Uninitialized, 1570 "Unknown variable type %u in StackMap in class file %s", 1571 tag, CHECK); 1572 } 1573 } 1574 u2_array[*u2_index] = index; 1575 *u1_index = i1; 1576 *u2_index = i2; 1577 } 1578 1579 u1* ClassFileParser::parse_stackmap_table( 1580 u4 code_attribute_length, TRAPS) { 1581 if (code_attribute_length == 0) 1582 return NULL; 1583 1584 ClassFileStream* cfs = stream(); 1585 u1* stackmap_table_start = cfs->get_u1_buffer(); 1586 assert(stackmap_table_start != NULL, "null stackmap table"); 1587 1588 // check code_attribute_length first 1589 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1590 1591 if (!_need_verify && !DumpSharedSpaces) { 1592 return NULL; 1593 } 1594 return stackmap_table_start; 1595 } 1596 1597 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1598 u4 method_attribute_length, 1599 TRAPS) { 1600 ClassFileStream* cfs = stream(); 1601 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1602 *checked_exceptions_length = cfs->get_u2_fast(); 1603 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1604 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1605 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1606 if (!_need_verify) { 1607 cfs->skip_u2_fast(size); 1608 } else { 1609 // Verify each value in the checked exception table 1610 u2 checked_exception; 1611 u2 len = *checked_exceptions_length; 1612 cfs->guarantee_more(2 * len, CHECK_NULL); 1613 for (int i = 0; i < len; i++) { 1614 checked_exception = cfs->get_u2_fast(); 1615 check_property( 1616 valid_klass_reference_at(checked_exception), 1617 "Exception name has bad type at constant pool %u in class file %s", 1618 checked_exception, CHECK_NULL); 1619 } 1620 } 1621 // check exceptions attribute length 1622 if (_need_verify) { 1623 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1624 sizeof(u2) * size), 1625 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1626 } 1627 return checked_exceptions_start; 1628 } 1629 1630 void ClassFileParser::throwIllegalSignature( 1631 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1632 ResourceMark rm(THREAD); 1633 Exceptions::fthrow(THREAD_AND_LOCATION, 1634 vmSymbols::java_lang_ClassFormatError(), 1635 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1636 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1637 } 1638 1639 // Skip an annotation. Return >=limit if there is any problem. 1640 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1641 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1642 // value := switch (tag:u1) { ... } 1643 index += 2; // skip atype 1644 if ((index += 2) >= limit) return limit; // read nmem 1645 int nmem = Bytes::get_Java_u2(buffer+index-2); 1646 while (--nmem >= 0 && index < limit) { 1647 index += 2; // skip member 1648 index = skip_annotation_value(buffer, limit, index); 1649 } 1650 return index; 1651 } 1652 1653 // Skip an annotation value. Return >=limit if there is any problem. 1654 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1655 // value := switch (tag:u1) { 1656 // case B, C, I, S, Z, D, F, J, c: con:u2; 1657 // case e: e_class:u2 e_name:u2; 1658 // case s: s_con:u2; 1659 // case [: do(nval:u2) {value}; 1660 // case @: annotation; 1661 // case s: s_con:u2; 1662 // } 1663 if ((index += 1) >= limit) return limit; // read tag 1664 u1 tag = buffer[index-1]; 1665 switch (tag) { 1666 case 'B': case 'C': case 'I': case 'S': case 'Z': 1667 case 'D': case 'F': case 'J': case 'c': case 's': 1668 index += 2; // skip con or s_con 1669 break; 1670 case 'e': 1671 index += 4; // skip e_class, e_name 1672 break; 1673 case '[': 1674 { 1675 if ((index += 2) >= limit) return limit; // read nval 1676 int nval = Bytes::get_Java_u2(buffer+index-2); 1677 while (--nval >= 0 && index < limit) { 1678 index = skip_annotation_value(buffer, limit, index); 1679 } 1680 } 1681 break; 1682 case '@': 1683 index = skip_annotation(buffer, limit, index); 1684 break; 1685 default: 1686 assert(false, "annotation tag"); 1687 return limit; // bad tag byte 1688 } 1689 return index; 1690 } 1691 1692 // Sift through annotations, looking for those significant to the VM: 1693 void ClassFileParser::parse_annotations(u1* buffer, int limit, 1694 ClassFileParser::AnnotationCollector* coll, 1695 TRAPS) { 1696 // annotations := do(nann:u2) {annotation} 1697 int index = 0; 1698 if ((index += 2) >= limit) return; // read nann 1699 int nann = Bytes::get_Java_u2(buffer+index-2); 1700 enum { // initial annotation layout 1701 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1702 count_off = 2, // u2 such as 1 (one value) 1703 member_off = 4, // utf8 such as 'value' 1704 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1705 e_tag_val = 'e', 1706 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1707 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1708 e_size = 11, // end of 'e' annotation 1709 c_tag_val = 'c', // payload is type 1710 c_con_off = 7, // utf8 payload, such as 'I' 1711 c_size = 9, // end of 'c' annotation 1712 s_tag_val = 's', // payload is String 1713 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1714 s_size = 9, 1715 min_size = 6 // smallest possible size (zero members) 1716 }; 1717 while ((--nann) >= 0 && (index-2 + min_size <= limit)) { 1718 int index0 = index; 1719 index = skip_annotation(buffer, limit, index); 1720 u1* abase = buffer + index0; 1721 int atype = Bytes::get_Java_u2(abase + atype_off); 1722 int count = Bytes::get_Java_u2(abase + count_off); 1723 Symbol* aname = check_symbol_at(_cp, atype); 1724 if (aname == NULL) break; // invalid annotation name 1725 Symbol* member = NULL; 1726 if (count >= 1) { 1727 int member_index = Bytes::get_Java_u2(abase + member_off); 1728 member = check_symbol_at(_cp, member_index); 1729 if (member == NULL) break; // invalid member name 1730 } 1731 1732 // Here is where parsing particular annotations will take place. 1733 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1734 if (id == AnnotationCollector::_unknown) continue; 1735 coll->set_annotation(id); 1736 1737 if (id == AnnotationCollector::_sun_misc_Contended) { 1738 // @Contended can optionally specify the contention group. 1739 // 1740 // Contended group defines the equivalence class over the fields: 1741 // the fields within the same contended group are not treated distinct. 1742 // The only exception is default group, which does not incur the 1743 // equivalence. Naturally, contention group for classes is meaningless. 1744 // 1745 // While the contention group is specified as String, annotation 1746 // values are already interned, and we might as well use the constant 1747 // pool index as the group tag. 1748 // 1749 u2 group_index = 0; // default contended group 1750 if (count == 1 1751 && s_size == (index - index0) // match size 1752 && s_tag_val == *(abase + tag_off) 1753 && member == vmSymbols::value_name()) { 1754 group_index = Bytes::get_Java_u2(abase + s_con_off); 1755 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1756 group_index = 0; // default contended group 1757 } 1758 } 1759 coll->set_contended_group(group_index); 1760 } 1761 } 1762 } 1763 1764 ClassFileParser::AnnotationCollector::ID 1765 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1766 Symbol* name) { 1767 vmSymbols::SID sid = vmSymbols::find_sid(name); 1768 // Privileged code can use all annotations. Other code silently drops some. 1769 const bool privileged = loader_data->is_the_null_class_loader_data() || 1770 loader_data->is_ext_class_loader_data() || 1771 loader_data->is_anonymous(); 1772 switch (sid) { 1773 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1774 if (_location != _in_method) break; // only allow for methods 1775 if (!privileged) break; // only allow in privileged code 1776 return _method_CallerSensitive; 1777 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1778 if (_location != _in_method) break; // only allow for methods 1779 if (!privileged) break; // only allow in privileged code 1780 return _method_ForceInline; 1781 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1782 if (_location != _in_method) break; // only allow for methods 1783 if (!privileged) break; // only allow in privileged code 1784 return _method_DontInline; 1785 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1786 if (_location != _in_method) break; // only allow for methods 1787 if (!privileged) break; // only allow in privileged code 1788 return _method_LambdaForm_Compiled; 1789 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1790 if (_location != _in_method) break; // only allow for methods 1791 if (!privileged) break; // only allow in privileged code 1792 return _method_LambdaForm_Hidden; 1793 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_Stable_signature): 1794 if (_location != _in_field) break; // only allow for fields 1795 if (!privileged) break; // only allow in privileged code 1796 return _field_Stable; 1797 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1798 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1799 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1800 return _sun_misc_Contended; 1801 default: break; 1802 } 1803 return AnnotationCollector::_unknown; 1804 } 1805 1806 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1807 if (is_contended()) 1808 f->set_contended_group(contended_group()); 1809 if (is_stable()) 1810 f->set_stable(true); 1811 } 1812 1813 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1814 // If there's an error deallocate metadata for field annotations 1815 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1816 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1817 } 1818 1819 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1820 if (has_annotation(_method_CallerSensitive)) 1821 m->set_caller_sensitive(true); 1822 if (has_annotation(_method_ForceInline)) 1823 m->set_force_inline(true); 1824 if (has_annotation(_method_DontInline)) 1825 m->set_dont_inline(true); 1826 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1827 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1828 if (has_annotation(_method_LambdaForm_Hidden)) 1829 m->set_hidden(true); 1830 } 1831 1832 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1833 k->set_is_contended(is_contended()); 1834 } 1835 1836 1837 #define MAX_ARGS_SIZE 255 1838 #define MAX_CODE_SIZE 65535 1839 #define INITIAL_MAX_LVT_NUMBER 256 1840 1841 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1842 * 1843 * Rules for LVT's and LVTT's are: 1844 * - There can be any number of LVT's and LVTT's. 1845 * - If there are n LVT's, it is the same as if there was just 1846 * one LVT containing all the entries from the n LVT's. 1847 * - There may be no more than one LVT entry per local variable. 1848 * Two LVT entries are 'equal' if these fields are the same: 1849 * start_pc, length, name, slot 1850 * - There may be no more than one LVTT entry per each LVT entry. 1851 * Each LVTT entry has to match some LVT entry. 1852 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1853 */ 1854 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1855 int lvt_cnt, 1856 u2* localvariable_table_length, 1857 u2** localvariable_table_start, 1858 int lvtt_cnt, 1859 u2* localvariable_type_table_length, 1860 u2** localvariable_type_table_start, 1861 TRAPS) { 1862 1863 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1864 initialize_hashtable(lvt_Hash); 1865 1866 // To fill LocalVariableTable in 1867 Classfile_LVT_Element* cf_lvt; 1868 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1869 1870 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1871 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1872 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1873 copy_lvt_element(&cf_lvt[idx], lvt); 1874 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1875 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1876 && _need_verify 1877 && _major_version >= JAVA_1_5_VERSION) { 1878 clear_hashtable(lvt_Hash); 1879 classfile_parse_error("Duplicated LocalVariableTable attribute " 1880 "entry for '%s' in class file %s", 1881 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1882 CHECK); 1883 } 1884 } 1885 } 1886 1887 // To merge LocalVariableTable and LocalVariableTypeTable 1888 Classfile_LVT_Element* cf_lvtt; 1889 LocalVariableTableElement lvtt_elem; 1890 1891 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1892 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1893 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1894 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1895 int index = hash(&lvtt_elem); 1896 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1897 if (entry == NULL) { 1898 if (_need_verify) { 1899 clear_hashtable(lvt_Hash); 1900 classfile_parse_error("LVTT entry for '%s' in class file %s " 1901 "does not match any LVT entry", 1902 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1903 CHECK); 1904 } 1905 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1906 clear_hashtable(lvt_Hash); 1907 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1908 "entry for '%s' in class file %s", 1909 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1910 CHECK); 1911 } else { 1912 // to add generic signatures into LocalVariableTable 1913 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1914 } 1915 } 1916 } 1917 clear_hashtable(lvt_Hash); 1918 } 1919 1920 1921 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1922 u1* runtime_visible_annotations, 1923 int runtime_visible_annotations_length, 1924 u1* runtime_invisible_annotations, 1925 int runtime_invisible_annotations_length, 1926 u1* runtime_visible_parameter_annotations, 1927 int runtime_visible_parameter_annotations_length, 1928 u1* runtime_invisible_parameter_annotations, 1929 int runtime_invisible_parameter_annotations_length, 1930 u1* runtime_visible_type_annotations, 1931 int runtime_visible_type_annotations_length, 1932 u1* runtime_invisible_type_annotations, 1933 int runtime_invisible_type_annotations_length, 1934 u1* annotation_default, 1935 int annotation_default_length, 1936 TRAPS) { 1937 1938 AnnotationArray* a; 1939 1940 if (runtime_visible_annotations_length + 1941 runtime_invisible_annotations_length > 0) { 1942 a = assemble_annotations(runtime_visible_annotations, 1943 runtime_visible_annotations_length, 1944 runtime_invisible_annotations, 1945 runtime_invisible_annotations_length, 1946 CHECK); 1947 cm->set_method_annotations(a); 1948 } 1949 1950 if (runtime_visible_parameter_annotations_length + 1951 runtime_invisible_parameter_annotations_length > 0) { 1952 a = assemble_annotations(runtime_visible_parameter_annotations, 1953 runtime_visible_parameter_annotations_length, 1954 runtime_invisible_parameter_annotations, 1955 runtime_invisible_parameter_annotations_length, 1956 CHECK); 1957 cm->set_parameter_annotations(a); 1958 } 1959 1960 if (annotation_default_length > 0) { 1961 a = assemble_annotations(annotation_default, 1962 annotation_default_length, 1963 NULL, 1964 0, 1965 CHECK); 1966 cm->set_default_annotations(a); 1967 } 1968 1969 if (runtime_visible_type_annotations_length + 1970 runtime_invisible_type_annotations_length > 0) { 1971 a = assemble_annotations(runtime_visible_type_annotations, 1972 runtime_visible_type_annotations_length, 1973 runtime_invisible_type_annotations, 1974 runtime_invisible_type_annotations_length, 1975 CHECK); 1976 cm->set_type_annotations(a); 1977 } 1978 } 1979 1980 1981 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1982 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1983 // Method* to save footprint, so we only know the size of the resulting Method* when the 1984 // entire method attribute is parsed. 1985 // 1986 // The promoted_flags parameter is used to pass relevant access_flags 1987 // from the method back up to the containing klass. These flag values 1988 // are added to klass's access_flags. 1989 1990 methodHandle ClassFileParser::parse_method(bool is_interface, 1991 AccessFlags *promoted_flags, 1992 TRAPS) { 1993 ClassFileStream* cfs = stream(); 1994 methodHandle nullHandle; 1995 ResourceMark rm(THREAD); 1996 // Parse fixed parts 1997 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1998 1999 int flags = cfs->get_u2_fast(); 2000 u2 name_index = cfs->get_u2_fast(); 2001 int cp_size = _cp->length(); 2002 check_property( 2003 valid_symbol_at(name_index), 2004 "Illegal constant pool index %u for method name in class file %s", 2005 name_index, CHECK_(nullHandle)); 2006 Symbol* name = _cp->symbol_at(name_index); 2007 verify_legal_method_name(name, CHECK_(nullHandle)); 2008 2009 u2 signature_index = cfs->get_u2_fast(); 2010 guarantee_property( 2011 valid_symbol_at(signature_index), 2012 "Illegal constant pool index %u for method signature in class file %s", 2013 signature_index, CHECK_(nullHandle)); 2014 Symbol* signature = _cp->symbol_at(signature_index); 2015 2016 AccessFlags access_flags; 2017 if (name == vmSymbols::class_initializer_name()) { 2018 // We ignore the other access flags for a valid class initializer. 2019 // (JVM Spec 2nd ed., chapter 4.6) 2020 if (_major_version < 51) { // backward compatibility 2021 flags = JVM_ACC_STATIC; 2022 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2023 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2024 } 2025 } else { 2026 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2027 } 2028 2029 int args_size = -1; // only used when _need_verify is true 2030 if (_need_verify) { 2031 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2032 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2033 if (args_size > MAX_ARGS_SIZE) { 2034 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2035 } 2036 } 2037 2038 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2039 2040 // Default values for code and exceptions attribute elements 2041 u2 max_stack = 0; 2042 u2 max_locals = 0; 2043 u4 code_length = 0; 2044 u1* code_start = 0; 2045 u2 exception_table_length = 0; 2046 u2* exception_table_start = NULL; 2047 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2048 u2 checked_exceptions_length = 0; 2049 u2* checked_exceptions_start = NULL; 2050 CompressedLineNumberWriteStream* linenumber_table = NULL; 2051 int linenumber_table_length = 0; 2052 int total_lvt_length = 0; 2053 u2 lvt_cnt = 0; 2054 u2 lvtt_cnt = 0; 2055 bool lvt_allocated = false; 2056 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2057 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2058 u2* localvariable_table_length; 2059 u2** localvariable_table_start; 2060 u2* localvariable_type_table_length; 2061 u2** localvariable_type_table_start; 2062 u2 method_parameters_length = 0; 2063 u1* method_parameters_data = NULL; 2064 bool method_parameters_seen = false; 2065 bool parsed_code_attribute = false; 2066 bool parsed_checked_exceptions_attribute = false; 2067 bool parsed_stackmap_attribute = false; 2068 // stackmap attribute - JDK1.5 2069 u1* stackmap_data = NULL; 2070 int stackmap_data_length = 0; 2071 u2 generic_signature_index = 0; 2072 MethodAnnotationCollector parsed_annotations; 2073 u1* runtime_visible_annotations = NULL; 2074 int runtime_visible_annotations_length = 0; 2075 u1* runtime_invisible_annotations = NULL; 2076 int runtime_invisible_annotations_length = 0; 2077 u1* runtime_visible_parameter_annotations = NULL; 2078 int runtime_visible_parameter_annotations_length = 0; 2079 u1* runtime_invisible_parameter_annotations = NULL; 2080 int runtime_invisible_parameter_annotations_length = 0; 2081 u1* runtime_visible_type_annotations = NULL; 2082 int runtime_visible_type_annotations_length = 0; 2083 u1* runtime_invisible_type_annotations = NULL; 2084 int runtime_invisible_type_annotations_length = 0; 2085 bool runtime_invisible_annotations_exists = false; 2086 bool runtime_invisible_type_annotations_exists = false; 2087 bool runtime_invisible_parameter_annotations_exists = false; 2088 u1* annotation_default = NULL; 2089 int annotation_default_length = 0; 2090 2091 // Parse code and exceptions attribute 2092 u2 method_attributes_count = cfs->get_u2_fast(); 2093 while (method_attributes_count--) { 2094 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2095 u2 method_attribute_name_index = cfs->get_u2_fast(); 2096 u4 method_attribute_length = cfs->get_u4_fast(); 2097 check_property( 2098 valid_symbol_at(method_attribute_name_index), 2099 "Invalid method attribute name index %u in class file %s", 2100 method_attribute_name_index, CHECK_(nullHandle)); 2101 2102 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2103 if (method_attribute_name == vmSymbols::tag_code()) { 2104 // Parse Code attribute 2105 if (_need_verify) { 2106 guarantee_property( 2107 !access_flags.is_native() && !access_flags.is_abstract(), 2108 "Code attribute in native or abstract methods in class file %s", 2109 CHECK_(nullHandle)); 2110 } 2111 if (parsed_code_attribute) { 2112 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2113 } 2114 parsed_code_attribute = true; 2115 2116 // Stack size, locals size, and code size 2117 if (_major_version == 45 && _minor_version <= 2) { 2118 cfs->guarantee_more(4, CHECK_(nullHandle)); 2119 max_stack = cfs->get_u1_fast(); 2120 max_locals = cfs->get_u1_fast(); 2121 code_length = cfs->get_u2_fast(); 2122 } else { 2123 cfs->guarantee_more(8, CHECK_(nullHandle)); 2124 max_stack = cfs->get_u2_fast(); 2125 max_locals = cfs->get_u2_fast(); 2126 code_length = cfs->get_u4_fast(); 2127 } 2128 if (_need_verify) { 2129 guarantee_property(args_size <= max_locals, 2130 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2131 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2132 "Invalid method Code length %u in class file %s", 2133 code_length, CHECK_(nullHandle)); 2134 } 2135 // Code pointer 2136 code_start = cfs->get_u1_buffer(); 2137 assert(code_start != NULL, "null code start"); 2138 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2139 cfs->skip_u1_fast(code_length); 2140 2141 // Exception handler table 2142 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2143 exception_table_length = cfs->get_u2_fast(); 2144 if (exception_table_length > 0) { 2145 exception_table_start = 2146 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2147 } 2148 2149 // Parse additional attributes in code attribute 2150 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2151 u2 code_attributes_count = cfs->get_u2_fast(); 2152 2153 unsigned int calculated_attribute_length = 0; 2154 2155 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2156 calculated_attribute_length = 2157 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2158 } else { 2159 // max_stack, locals and length are smaller in pre-version 45.2 classes 2160 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2161 } 2162 calculated_attribute_length += 2163 code_length + 2164 sizeof(exception_table_length) + 2165 sizeof(code_attributes_count) + 2166 exception_table_length * 2167 ( sizeof(u2) + // start_pc 2168 sizeof(u2) + // end_pc 2169 sizeof(u2) + // handler_pc 2170 sizeof(u2) ); // catch_type_index 2171 2172 while (code_attributes_count--) { 2173 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2174 u2 code_attribute_name_index = cfs->get_u2_fast(); 2175 u4 code_attribute_length = cfs->get_u4_fast(); 2176 calculated_attribute_length += code_attribute_length + 2177 sizeof(code_attribute_name_index) + 2178 sizeof(code_attribute_length); 2179 check_property(valid_symbol_at(code_attribute_name_index), 2180 "Invalid code attribute name index %u in class file %s", 2181 code_attribute_name_index, 2182 CHECK_(nullHandle)); 2183 if (LoadLineNumberTables && 2184 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2185 // Parse and compress line number table 2186 parse_linenumber_table(code_attribute_length, code_length, 2187 &linenumber_table, CHECK_(nullHandle)); 2188 2189 } else if (LoadLocalVariableTables && 2190 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2191 // Parse local variable table 2192 if (!lvt_allocated) { 2193 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2194 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2195 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2196 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2197 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2198 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2199 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2200 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2201 lvt_allocated = true; 2202 } 2203 if (lvt_cnt == max_lvt_cnt) { 2204 max_lvt_cnt <<= 1; 2205 localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2206 localvariable_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2207 } 2208 localvariable_table_start[lvt_cnt] = 2209 parse_localvariable_table(code_length, 2210 max_locals, 2211 code_attribute_length, 2212 &localvariable_table_length[lvt_cnt], 2213 false, // is not LVTT 2214 CHECK_(nullHandle)); 2215 total_lvt_length += localvariable_table_length[lvt_cnt]; 2216 lvt_cnt++; 2217 } else if (LoadLocalVariableTypeTables && 2218 _major_version >= JAVA_1_5_VERSION && 2219 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2220 if (!lvt_allocated) { 2221 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2222 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2223 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2224 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2225 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2226 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2227 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2228 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2229 lvt_allocated = true; 2230 } 2231 // Parse local variable type table 2232 if (lvtt_cnt == max_lvtt_cnt) { 2233 max_lvtt_cnt <<= 1; 2234 localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2235 localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2236 } 2237 localvariable_type_table_start[lvtt_cnt] = 2238 parse_localvariable_table(code_length, 2239 max_locals, 2240 code_attribute_length, 2241 &localvariable_type_table_length[lvtt_cnt], 2242 true, // is LVTT 2243 CHECK_(nullHandle)); 2244 lvtt_cnt++; 2245 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2246 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2247 // Stack map is only needed by the new verifier in JDK1.5. 2248 if (parsed_stackmap_attribute) { 2249 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2250 } 2251 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2252 stackmap_data_length = code_attribute_length; 2253 parsed_stackmap_attribute = true; 2254 } else { 2255 // Skip unknown attributes 2256 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2257 } 2258 } 2259 // check method attribute length 2260 if (_need_verify) { 2261 guarantee_property(method_attribute_length == calculated_attribute_length, 2262 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2263 } 2264 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2265 // Parse Exceptions attribute 2266 if (parsed_checked_exceptions_attribute) { 2267 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2268 } 2269 parsed_checked_exceptions_attribute = true; 2270 checked_exceptions_start = 2271 parse_checked_exceptions(&checked_exceptions_length, 2272 method_attribute_length, 2273 CHECK_(nullHandle)); 2274 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2275 // reject multiple method parameters 2276 if (method_parameters_seen) { 2277 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2278 } 2279 method_parameters_seen = true; 2280 method_parameters_length = cfs->get_u1_fast(); 2281 if (method_attribute_length != (method_parameters_length * 4u) + 1u) { 2282 classfile_parse_error( 2283 "Invalid MethodParameters method attribute length %u in class file", 2284 method_attribute_length, CHECK_(nullHandle)); 2285 } 2286 method_parameters_data = cfs->get_u1_buffer(); 2287 cfs->skip_u2_fast(method_parameters_length); 2288 cfs->skip_u2_fast(method_parameters_length); 2289 // ignore this attribute if it cannot be reflected 2290 if (!SystemDictionary::Parameter_klass_loaded()) 2291 method_parameters_length = 0; 2292 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2293 if (method_attribute_length != 0) { 2294 classfile_parse_error( 2295 "Invalid Synthetic method attribute length %u in class file %s", 2296 method_attribute_length, CHECK_(nullHandle)); 2297 } 2298 // Should we check that there hasn't already been a synthetic attribute? 2299 access_flags.set_is_synthetic(); 2300 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2301 if (method_attribute_length != 0) { 2302 classfile_parse_error( 2303 "Invalid Deprecated method attribute length %u in class file %s", 2304 method_attribute_length, CHECK_(nullHandle)); 2305 } 2306 } else if (_major_version >= JAVA_1_5_VERSION) { 2307 if (method_attribute_name == vmSymbols::tag_signature()) { 2308 if (method_attribute_length != 2) { 2309 classfile_parse_error( 2310 "Invalid Signature attribute length %u in class file %s", 2311 method_attribute_length, CHECK_(nullHandle)); 2312 } 2313 generic_signature_index = parse_generic_signature_attribute(CHECK_(nullHandle)); 2314 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2315 if (runtime_visible_annotations != NULL) { 2316 classfile_parse_error( 2317 "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2318 } 2319 runtime_visible_annotations_length = method_attribute_length; 2320 runtime_visible_annotations = cfs->get_u1_buffer(); 2321 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2322 parse_annotations(runtime_visible_annotations, 2323 runtime_visible_annotations_length, &parsed_annotations, 2324 CHECK_(nullHandle)); 2325 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2326 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2327 if (runtime_invisible_annotations_exists) { 2328 classfile_parse_error( 2329 "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2330 } 2331 runtime_invisible_annotations_exists = true; 2332 if (PreserveAllAnnotations) { 2333 runtime_invisible_annotations_length = method_attribute_length; 2334 runtime_invisible_annotations = cfs->get_u1_buffer(); 2335 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2336 } 2337 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2338 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2339 if (runtime_visible_parameter_annotations != NULL) { 2340 classfile_parse_error( 2341 "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2342 } 2343 runtime_visible_parameter_annotations_length = method_attribute_length; 2344 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2345 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2346 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2347 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2348 if (runtime_invisible_parameter_annotations_exists) { 2349 classfile_parse_error( 2350 "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", CHECK_(nullHandle)); 2351 } 2352 runtime_invisible_parameter_annotations_exists = true; 2353 if (PreserveAllAnnotations) { 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 } 2358 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2359 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2360 if (annotation_default != NULL) { 2361 classfile_parse_error( 2362 "Multiple AnnotationDefault attributes for method in class file %s", 2363 CHECK_(nullHandle)); 2364 } 2365 annotation_default_length = method_attribute_length; 2366 annotation_default = cfs->get_u1_buffer(); 2367 assert(annotation_default != NULL, "null annotation default"); 2368 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2369 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2370 if (runtime_visible_type_annotations != NULL) { 2371 classfile_parse_error( 2372 "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", 2373 CHECK_(nullHandle)); 2374 } 2375 runtime_visible_type_annotations_length = method_attribute_length; 2376 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2377 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2378 // No need for the VM to parse Type annotations 2379 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2380 } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2381 if (runtime_invisible_type_annotations_exists) { 2382 classfile_parse_error( 2383 "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", 2384 CHECK_(nullHandle)); 2385 } else { 2386 runtime_invisible_type_annotations_exists = true; 2387 } 2388 if (PreserveAllAnnotations) { 2389 runtime_invisible_type_annotations_length = method_attribute_length; 2390 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2391 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2392 } 2393 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2394 } else { 2395 // Skip unknown attributes 2396 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2397 } 2398 } else { 2399 // Skip unknown attributes 2400 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2401 } 2402 } 2403 2404 if (linenumber_table != NULL) { 2405 linenumber_table->write_terminator(); 2406 linenumber_table_length = linenumber_table->position(); 2407 } 2408 2409 // Make sure there's at least one Code attribute in non-native/non-abstract method 2410 if (_need_verify) { 2411 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2412 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2413 } 2414 2415 // All sizing information for a Method* is finally available, now create it 2416 InlineTableSizes sizes( 2417 total_lvt_length, 2418 linenumber_table_length, 2419 exception_table_length, 2420 checked_exceptions_length, 2421 method_parameters_length, 2422 generic_signature_index, 2423 runtime_visible_annotations_length + 2424 runtime_invisible_annotations_length, 2425 runtime_visible_parameter_annotations_length + 2426 runtime_invisible_parameter_annotations_length, 2427 runtime_visible_type_annotations_length + 2428 runtime_invisible_type_annotations_length, 2429 annotation_default_length, 2430 0); 2431 2432 Method* m = Method::allocate( 2433 _loader_data, code_length, access_flags, &sizes, 2434 ConstMethod::NORMAL, CHECK_(nullHandle)); 2435 2436 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2437 2438 // Fill in information from fixed part (access_flags already set) 2439 m->set_constants(_cp); 2440 m->set_name_index(name_index); 2441 m->set_signature_index(signature_index); 2442 #ifdef CC_INTERP 2443 // hmm is there a gc issue here?? 2444 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2445 m->set_result_index(rtf.type()); 2446 #endif 2447 2448 if (args_size >= 0) { 2449 m->set_size_of_parameters(args_size); 2450 } else { 2451 m->compute_size_of_parameters(THREAD); 2452 } 2453 #ifdef ASSERT 2454 if (args_size >= 0) { 2455 m->compute_size_of_parameters(THREAD); 2456 assert(args_size == m->size_of_parameters(), ""); 2457 } 2458 #endif 2459 2460 // Fill in code attribute information 2461 m->set_max_stack(max_stack); 2462 m->set_max_locals(max_locals); 2463 if (stackmap_data != NULL) { 2464 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2465 stackmap_data_length, CHECK_NULL); 2466 } 2467 2468 // Copy byte codes 2469 m->set_code(code_start); 2470 2471 // Copy line number table 2472 if (linenumber_table != NULL) { 2473 memcpy(m->compressed_linenumber_table(), 2474 linenumber_table->buffer(), linenumber_table_length); 2475 } 2476 2477 // Copy exception table 2478 if (exception_table_length > 0) { 2479 int size = 2480 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2481 copy_u2_with_conversion((u2*) m->exception_table_start(), 2482 exception_table_start, size); 2483 } 2484 2485 // Copy method parameters 2486 if (method_parameters_length > 0) { 2487 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2488 for (int i = 0; i < method_parameters_length; i++) { 2489 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2490 method_parameters_data += 2; 2491 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2492 method_parameters_data += 2; 2493 } 2494 } 2495 2496 // Copy checked exceptions 2497 if (checked_exceptions_length > 0) { 2498 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2499 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2500 } 2501 2502 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2503 if (total_lvt_length > 0) { 2504 promoted_flags->set_has_localvariable_table(); 2505 copy_localvariable_table(m->constMethod(), lvt_cnt, 2506 localvariable_table_length, 2507 localvariable_table_start, 2508 lvtt_cnt, 2509 localvariable_type_table_length, 2510 localvariable_type_table_start, CHECK_NULL); 2511 } 2512 2513 if (parsed_annotations.has_any_annotations()) 2514 parsed_annotations.apply_to(m); 2515 2516 // Copy annotations 2517 copy_method_annotations(m->constMethod(), 2518 runtime_visible_annotations, 2519 runtime_visible_annotations_length, 2520 runtime_invisible_annotations, 2521 runtime_invisible_annotations_length, 2522 runtime_visible_parameter_annotations, 2523 runtime_visible_parameter_annotations_length, 2524 runtime_invisible_parameter_annotations, 2525 runtime_invisible_parameter_annotations_length, 2526 runtime_visible_type_annotations, 2527 runtime_visible_type_annotations_length, 2528 runtime_invisible_type_annotations, 2529 runtime_invisible_type_annotations_length, 2530 annotation_default, 2531 annotation_default_length, 2532 CHECK_NULL); 2533 2534 if (name == vmSymbols::finalize_method_name() && 2535 signature == vmSymbols::void_method_signature()) { 2536 if (m->is_empty_method()) { 2537 _has_empty_finalizer = true; 2538 } else { 2539 _has_finalizer = true; 2540 } 2541 } 2542 if (name == vmSymbols::object_initializer_name() && 2543 signature == vmSymbols::void_method_signature() && 2544 m->is_vanilla_constructor()) { 2545 _has_vanilla_constructor = true; 2546 } 2547 2548 NOT_PRODUCT(m->verify()); 2549 return m; 2550 } 2551 2552 2553 // The promoted_flags parameter is used to pass relevant access_flags 2554 // from the methods back up to the containing klass. These flag values 2555 // are added to klass's access_flags. 2556 2557 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2558 AccessFlags* promoted_flags, 2559 bool* has_final_method, 2560 bool* has_default_methods, 2561 TRAPS) { 2562 ClassFileStream* cfs = stream(); 2563 cfs->guarantee_more(2, CHECK_NULL); // length 2564 u2 length = cfs->get_u2_fast(); 2565 if (length == 0) { 2566 _methods = Universe::the_empty_method_array(); 2567 } else { 2568 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2569 2570 HandleMark hm(THREAD); 2571 for (int index = 0; index < length; index++) { 2572 methodHandle method = parse_method(is_interface, 2573 promoted_flags, 2574 CHECK_NULL); 2575 2576 if (method->is_final()) { 2577 *has_final_method = true; 2578 } 2579 if (is_interface && !(*has_default_methods) 2580 && !method->is_abstract() && !method->is_static() 2581 && !method->is_private()) { 2582 // default method 2583 *has_default_methods = true; 2584 } 2585 _methods->at_put(index, method()); 2586 } 2587 2588 if (_need_verify && length > 1) { 2589 // Check duplicated methods 2590 ResourceMark rm(THREAD); 2591 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2592 THREAD, NameSigHash*, HASH_ROW_SIZE); 2593 initialize_hashtable(names_and_sigs); 2594 bool dup = false; 2595 { 2596 debug_only(No_Safepoint_Verifier nsv;) 2597 for (int i = 0; i < length; i++) { 2598 Method* m = _methods->at(i); 2599 // If no duplicates, add name/signature in hashtable names_and_sigs. 2600 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2601 dup = true; 2602 break; 2603 } 2604 } 2605 } 2606 if (dup) { 2607 classfile_parse_error("Duplicate method name&signature in class file %s", 2608 CHECK_NULL); 2609 } 2610 } 2611 } 2612 return _methods; 2613 } 2614 2615 2616 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2617 int length = methods->length(); 2618 // If JVMTI original method ordering or sharing is enabled we have to 2619 // remember the original class file ordering. 2620 // We temporarily use the vtable_index field in the Method* to store the 2621 // class file index, so we can read in after calling qsort. 2622 // Put the method ordering in the shared archive. 2623 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2624 for (int index = 0; index < length; index++) { 2625 Method* m = methods->at(index); 2626 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2627 m->set_vtable_index(index); 2628 } 2629 } 2630 // Sort method array by ascending method name (for faster lookups & vtable construction) 2631 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2632 Method::sort_methods(methods); 2633 2634 intArray* method_ordering = NULL; 2635 // If JVMTI original method ordering or sharing is enabled construct int 2636 // array remembering the original ordering 2637 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2638 method_ordering = new intArray(length); 2639 for (int index = 0; index < length; index++) { 2640 Method* m = methods->at(index); 2641 int old_index = m->vtable_index(); 2642 assert(old_index >= 0 && old_index < length, "invalid method index"); 2643 method_ordering->at_put(index, old_index); 2644 m->set_vtable_index(Method::invalid_vtable_index); 2645 } 2646 } 2647 return method_ordering; 2648 } 2649 2650 // Parse generic_signature attribute for methods and fields 2651 u2 ClassFileParser::parse_generic_signature_attribute(TRAPS) { 2652 ClassFileStream* cfs = stream(); 2653 cfs->guarantee_more(2, CHECK_0); // generic_signature_index 2654 u2 generic_signature_index = cfs->get_u2_fast(); 2655 check_property( 2656 valid_symbol_at(generic_signature_index), 2657 "Invalid Signature attribute at constant pool index %u in class file %s", 2658 generic_signature_index, CHECK_0); 2659 return generic_signature_index; 2660 } 2661 2662 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2663 ClassFileStream* cfs = stream(); 2664 cfs->guarantee_more(2, CHECK); // sourcefile_index 2665 u2 sourcefile_index = cfs->get_u2_fast(); 2666 check_property( 2667 valid_symbol_at(sourcefile_index), 2668 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2669 sourcefile_index, CHECK); 2670 set_class_sourcefile_index(sourcefile_index); 2671 } 2672 2673 2674 2675 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2676 ClassFileStream* cfs = stream(); 2677 u1* sde_buffer = cfs->get_u1_buffer(); 2678 assert(sde_buffer != NULL, "null sde buffer"); 2679 2680 // Don't bother storing it if there is no way to retrieve it 2681 if (JvmtiExport::can_get_source_debug_extension()) { 2682 assert((length+1) > length, "Overflow checking"); 2683 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2684 for (int i = 0; i < length; i++) { 2685 sde[i] = sde_buffer[i]; 2686 } 2687 sde[length] = '\0'; 2688 set_class_sde_buffer((char*)sde, length); 2689 } 2690 // Got utf8 string, set stream position forward 2691 cfs->skip_u1(length, CHECK); 2692 } 2693 2694 2695 // Inner classes can be static, private or protected (classic VM does this) 2696 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2697 2698 // Return number of classes in the inner classes attribute table 2699 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2700 bool parsed_enclosingmethod_attribute, 2701 u2 enclosing_method_class_index, 2702 u2 enclosing_method_method_index, 2703 TRAPS) { 2704 ClassFileStream* cfs = stream(); 2705 u1* current_mark = cfs->current(); 2706 u2 length = 0; 2707 if (inner_classes_attribute_start != NULL) { 2708 cfs->set_current(inner_classes_attribute_start); 2709 cfs->guarantee_more(2, CHECK_0); // length 2710 length = cfs->get_u2_fast(); 2711 } 2712 2713 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2714 // method data: 2715 // [inner_class_info_index, 2716 // outer_class_info_index, 2717 // inner_name_index, 2718 // inner_class_access_flags, 2719 // ... 2720 // enclosing_method_class_index, 2721 // enclosing_method_method_index] 2722 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2723 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2724 _inner_classes = inner_classes; 2725 2726 int index = 0; 2727 int cp_size = _cp->length(); 2728 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2729 for (int n = 0; n < length; n++) { 2730 // Inner class index 2731 u2 inner_class_info_index = cfs->get_u2_fast(); 2732 check_property( 2733 inner_class_info_index == 0 || 2734 valid_klass_reference_at(inner_class_info_index), 2735 "inner_class_info_index %u has bad constant type in class file %s", 2736 inner_class_info_index, CHECK_0); 2737 // Outer class index 2738 u2 outer_class_info_index = cfs->get_u2_fast(); 2739 check_property( 2740 outer_class_info_index == 0 || 2741 valid_klass_reference_at(outer_class_info_index), 2742 "outer_class_info_index %u has bad constant type in class file %s", 2743 outer_class_info_index, CHECK_0); 2744 // Inner class name 2745 u2 inner_name_index = cfs->get_u2_fast(); 2746 check_property( 2747 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2748 "inner_name_index %u has bad constant type in class file %s", 2749 inner_name_index, CHECK_0); 2750 if (_need_verify) { 2751 guarantee_property(inner_class_info_index != outer_class_info_index, 2752 "Class is both outer and inner class in class file %s", CHECK_0); 2753 } 2754 // Access flags 2755 AccessFlags inner_access_flags; 2756 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2757 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2758 // Set abstract bit for old class files for backward compatibility 2759 flags |= JVM_ACC_ABSTRACT; 2760 } 2761 verify_legal_class_modifiers(flags, CHECK_0); 2762 inner_access_flags.set_flags(flags); 2763 2764 inner_classes->at_put(index++, inner_class_info_index); 2765 inner_classes->at_put(index++, outer_class_info_index); 2766 inner_classes->at_put(index++, inner_name_index); 2767 inner_classes->at_put(index++, inner_access_flags.as_short()); 2768 } 2769 2770 // 4347400: make sure there's no duplicate entry in the classes array 2771 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2772 for(int i = 0; i < length * 4; i += 4) { 2773 for(int j = i + 4; j < length * 4; j += 4) { 2774 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2775 inner_classes->at(i+1) != inner_classes->at(j+1) || 2776 inner_classes->at(i+2) != inner_classes->at(j+2) || 2777 inner_classes->at(i+3) != inner_classes->at(j+3)), 2778 "Duplicate entry in InnerClasses in class file %s", 2779 CHECK_0); 2780 } 2781 } 2782 } 2783 2784 // Set EnclosingMethod class and method indexes. 2785 if (parsed_enclosingmethod_attribute) { 2786 inner_classes->at_put(index++, enclosing_method_class_index); 2787 inner_classes->at_put(index++, enclosing_method_method_index); 2788 } 2789 assert(index == size, "wrong size"); 2790 2791 // Restore buffer's current position. 2792 cfs->set_current(current_mark); 2793 2794 return length; 2795 } 2796 2797 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2798 set_class_synthetic_flag(true); 2799 } 2800 2801 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2802 ClassFileStream* cfs = stream(); 2803 u2 signature_index = cfs->get_u2(CHECK); 2804 check_property( 2805 valid_symbol_at(signature_index), 2806 "Invalid constant pool index %u in Signature attribute in class file %s", 2807 signature_index, CHECK); 2808 set_class_generic_signature_index(signature_index); 2809 } 2810 2811 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2812 ClassFileStream* cfs = stream(); 2813 u1* current_start = cfs->current(); 2814 2815 guarantee_property(attribute_byte_length >= sizeof(u2), 2816 "Invalid BootstrapMethods attribute length %u in class file %s", 2817 attribute_byte_length, 2818 CHECK); 2819 2820 cfs->guarantee_more(attribute_byte_length, CHECK); 2821 2822 int attribute_array_length = cfs->get_u2_fast(); 2823 2824 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2825 "Short length on BootstrapMethods in class file %s", 2826 CHECK); 2827 2828 2829 // The attribute contains a counted array of counted tuples of shorts, 2830 // represending bootstrap specifiers: 2831 // length*{bootstrap_method_index, argument_count*{argument_index}} 2832 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2833 // operand_count = number of shorts in attr, except for leading length 2834 2835 // The attribute is copied into a short[] array. 2836 // The array begins with a series of short[2] pairs, one for each tuple. 2837 int index_size = (attribute_array_length * 2); 2838 2839 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2840 2841 // Eagerly assign operands so they will be deallocated with the constant 2842 // pool if there is an error. 2843 _cp->set_operands(operands); 2844 2845 int operand_fill_index = index_size; 2846 int cp_size = _cp->length(); 2847 2848 for (int n = 0; n < attribute_array_length; n++) { 2849 // Store a 32-bit offset into the header of the operand array. 2850 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2851 2852 // Read a bootstrap specifier. 2853 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2854 u2 bootstrap_method_index = cfs->get_u2_fast(); 2855 u2 argument_count = cfs->get_u2_fast(); 2856 check_property( 2857 valid_cp_range(bootstrap_method_index, cp_size) && 2858 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2859 "bootstrap_method_index %u has bad constant type in class file %s", 2860 bootstrap_method_index, 2861 CHECK); 2862 2863 guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), 2864 "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", 2865 CHECK); 2866 2867 operands->at_put(operand_fill_index++, bootstrap_method_index); 2868 operands->at_put(operand_fill_index++, argument_count); 2869 2870 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2871 for (int j = 0; j < argument_count; j++) { 2872 u2 argument_index = cfs->get_u2_fast(); 2873 check_property( 2874 valid_cp_range(argument_index, cp_size) && 2875 _cp->tag_at(argument_index).is_loadable_constant(), 2876 "argument_index %u has bad constant type in class file %s", 2877 argument_index, 2878 CHECK); 2879 operands->at_put(operand_fill_index++, argument_index); 2880 } 2881 } 2882 2883 u1* current_end = cfs->current(); 2884 guarantee_property(current_end == current_start + attribute_byte_length, 2885 "Bad length on BootstrapMethods in class file %s", 2886 CHECK); 2887 } 2888 2889 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2890 TRAPS) { 2891 ClassFileStream* cfs = stream(); 2892 // Set inner classes attribute to default sentinel 2893 _inner_classes = Universe::the_empty_short_array(); 2894 cfs->guarantee_more(2, CHECK); // attributes_count 2895 u2 attributes_count = cfs->get_u2_fast(); 2896 bool parsed_sourcefile_attribute = false; 2897 bool parsed_innerclasses_attribute = false; 2898 bool parsed_enclosingmethod_attribute = false; 2899 bool parsed_bootstrap_methods_attribute = false; 2900 u1* runtime_visible_annotations = NULL; 2901 int runtime_visible_annotations_length = 0; 2902 u1* runtime_invisible_annotations = NULL; 2903 int runtime_invisible_annotations_length = 0; 2904 u1* runtime_visible_type_annotations = NULL; 2905 int runtime_visible_type_annotations_length = 0; 2906 u1* runtime_invisible_type_annotations = NULL; 2907 int runtime_invisible_type_annotations_length = 0; 2908 bool runtime_invisible_type_annotations_exists = false; 2909 bool runtime_invisible_annotations_exists = false; 2910 bool parsed_source_debug_ext_annotations_exist = false; 2911 u1* inner_classes_attribute_start = NULL; 2912 u4 inner_classes_attribute_length = 0; 2913 u2 enclosing_method_class_index = 0; 2914 u2 enclosing_method_method_index = 0; 2915 // Iterate over attributes 2916 while (attributes_count--) { 2917 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2918 u2 attribute_name_index = cfs->get_u2_fast(); 2919 u4 attribute_length = cfs->get_u4_fast(); 2920 check_property( 2921 valid_symbol_at(attribute_name_index), 2922 "Attribute name has bad constant pool index %u in class file %s", 2923 attribute_name_index, CHECK); 2924 Symbol* tag = _cp->symbol_at(attribute_name_index); 2925 if (tag == vmSymbols::tag_source_file()) { 2926 // Check for SourceFile tag 2927 if (_need_verify) { 2928 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2929 } 2930 if (parsed_sourcefile_attribute) { 2931 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2932 } else { 2933 parsed_sourcefile_attribute = true; 2934 } 2935 parse_classfile_sourcefile_attribute(CHECK); 2936 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2937 // Check for SourceDebugExtension tag 2938 if (parsed_source_debug_ext_annotations_exist) { 2939 classfile_parse_error( 2940 "Multiple SourceDebugExtension attributes in class file %s", CHECK); 2941 } 2942 parsed_source_debug_ext_annotations_exist = true; 2943 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2944 } else if (tag == vmSymbols::tag_inner_classes()) { 2945 // Check for InnerClasses tag 2946 if (parsed_innerclasses_attribute) { 2947 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2948 } else { 2949 parsed_innerclasses_attribute = true; 2950 } 2951 inner_classes_attribute_start = cfs->get_u1_buffer(); 2952 inner_classes_attribute_length = attribute_length; 2953 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2954 } else if (tag == vmSymbols::tag_synthetic()) { 2955 // Check for Synthetic tag 2956 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2957 if (attribute_length != 0) { 2958 classfile_parse_error( 2959 "Invalid Synthetic classfile attribute length %u in class file %s", 2960 attribute_length, CHECK); 2961 } 2962 parse_classfile_synthetic_attribute(CHECK); 2963 } else if (tag == vmSymbols::tag_deprecated()) { 2964 // Check for Deprecatd tag - 4276120 2965 if (attribute_length != 0) { 2966 classfile_parse_error( 2967 "Invalid Deprecated classfile attribute length %u in class file %s", 2968 attribute_length, CHECK); 2969 } 2970 } else if (_major_version >= JAVA_1_5_VERSION) { 2971 if (tag == vmSymbols::tag_signature()) { 2972 if (attribute_length != 2) { 2973 classfile_parse_error( 2974 "Wrong Signature attribute length %u in class file %s", 2975 attribute_length, CHECK); 2976 } 2977 parse_classfile_signature_attribute(CHECK); 2978 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2979 if (runtime_visible_annotations != NULL) { 2980 classfile_parse_error( 2981 "Multiple RuntimeVisibleAnnotations attributes in class file %s", CHECK); 2982 } 2983 runtime_visible_annotations_length = attribute_length; 2984 runtime_visible_annotations = cfs->get_u1_buffer(); 2985 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2986 parse_annotations(runtime_visible_annotations, 2987 runtime_visible_annotations_length, 2988 parsed_annotations, 2989 CHECK); 2990 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2991 } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { 2992 if (runtime_invisible_annotations_exists) { 2993 classfile_parse_error( 2994 "Multiple RuntimeInvisibleAnnotations attributes in class file %s", CHECK); 2995 } 2996 runtime_invisible_annotations_exists = true; 2997 if (PreserveAllAnnotations) { 2998 runtime_invisible_annotations_length = attribute_length; 2999 runtime_invisible_annotations = cfs->get_u1_buffer(); 3000 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 3001 } 3002 cfs->skip_u1(attribute_length, CHECK); 3003 } else if (tag == vmSymbols::tag_enclosing_method()) { 3004 if (parsed_enclosingmethod_attribute) { 3005 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 3006 } else { 3007 parsed_enclosingmethod_attribute = true; 3008 } 3009 guarantee_property(attribute_length == 4, 3010 "Wrong EnclosingMethod attribute length %u in class file %s", 3011 attribute_length, CHECK); 3012 cfs->guarantee_more(4, CHECK); // class_index, method_index 3013 enclosing_method_class_index = cfs->get_u2_fast(); 3014 enclosing_method_method_index = cfs->get_u2_fast(); 3015 if (enclosing_method_class_index == 0) { 3016 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 3017 } 3018 // Validate the constant pool indices and types 3019 check_property(valid_klass_reference_at(enclosing_method_class_index), 3020 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 3021 if (enclosing_method_method_index != 0 && 3022 (!_cp->is_within_bounds(enclosing_method_method_index) || 3023 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 3024 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 3025 } 3026 } else if (tag == vmSymbols::tag_bootstrap_methods() && 3027 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 3028 if (parsed_bootstrap_methods_attribute) 3029 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 3030 parsed_bootstrap_methods_attribute = true; 3031 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 3032 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 3033 if (runtime_visible_type_annotations != NULL) { 3034 classfile_parse_error( 3035 "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", CHECK); 3036 } 3037 runtime_visible_type_annotations_length = attribute_length; 3038 runtime_visible_type_annotations = cfs->get_u1_buffer(); 3039 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 3040 // No need for the VM to parse Type annotations 3041 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 3042 } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 3043 if (runtime_invisible_type_annotations_exists) { 3044 classfile_parse_error( 3045 "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", CHECK); 3046 } else { 3047 runtime_invisible_type_annotations_exists = true; 3048 } 3049 if (PreserveAllAnnotations) { 3050 runtime_invisible_type_annotations_length = attribute_length; 3051 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 3052 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 3053 } 3054 cfs->skip_u1(attribute_length, CHECK); 3055 } else { 3056 // Unknown attribute 3057 cfs->skip_u1(attribute_length, CHECK); 3058 } 3059 } else { 3060 // Unknown attribute 3061 cfs->skip_u1(attribute_length, CHECK); 3062 } 3063 } 3064 _annotations = assemble_annotations(runtime_visible_annotations, 3065 runtime_visible_annotations_length, 3066 runtime_invisible_annotations, 3067 runtime_invisible_annotations_length, 3068 CHECK); 3069 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 3070 runtime_visible_type_annotations_length, 3071 runtime_invisible_type_annotations, 3072 runtime_invisible_type_annotations_length, 3073 CHECK); 3074 3075 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 3076 u2 num_of_classes = parse_classfile_inner_classes_attribute( 3077 inner_classes_attribute_start, 3078 parsed_innerclasses_attribute, 3079 enclosing_method_class_index, 3080 enclosing_method_method_index, 3081 CHECK); 3082 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 3083 guarantee_property( 3084 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 3085 "Wrong InnerClasses attribute length in class file %s", CHECK); 3086 } 3087 } 3088 3089 if (_max_bootstrap_specifier_index >= 0) { 3090 guarantee_property(parsed_bootstrap_methods_attribute, 3091 "Missing BootstrapMethods attribute in class file %s", CHECK); 3092 } 3093 } 3094 3095 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 3096 if (_synthetic_flag) 3097 k->set_is_synthetic(); 3098 if (_sourcefile_index != 0) { 3099 k->set_source_file_name_index(_sourcefile_index); 3100 } 3101 if (_generic_signature_index != 0) { 3102 k->set_generic_signature_index(_generic_signature_index); 3103 } 3104 if (_sde_buffer != NULL) { 3105 k->set_source_debug_extension(_sde_buffer, _sde_length); 3106 } 3107 } 3108 3109 // Transfer ownership of metadata allocated to the InstanceKlass. 3110 void ClassFileParser::apply_parsed_class_metadata( 3111 instanceKlassHandle this_klass, 3112 int java_fields_count, TRAPS) { 3113 // Assign annotations if needed 3114 if (_annotations != NULL || _type_annotations != NULL || 3115 _fields_annotations != NULL || _fields_type_annotations != NULL) { 3116 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3117 annotations->set_class_annotations(_annotations); 3118 annotations->set_class_type_annotations(_type_annotations); 3119 annotations->set_fields_annotations(_fields_annotations); 3120 annotations->set_fields_type_annotations(_fields_type_annotations); 3121 this_klass->set_annotations(annotations); 3122 } 3123 3124 _cp->set_pool_holder(this_klass()); 3125 this_klass->set_constants(_cp); 3126 this_klass->set_fields(_fields, java_fields_count); 3127 this_klass->set_methods(_methods); 3128 this_klass->set_inner_classes(_inner_classes); 3129 this_klass->set_local_interfaces(_local_interfaces); 3130 this_klass->set_transitive_interfaces(_transitive_interfaces); 3131 3132 // Clear out these fields so they don't get deallocated by the destructor 3133 clear_class_metadata(); 3134 } 3135 3136 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3137 int runtime_visible_annotations_length, 3138 u1* runtime_invisible_annotations, 3139 int runtime_invisible_annotations_length, TRAPS) { 3140 AnnotationArray* annotations = NULL; 3141 if (runtime_visible_annotations != NULL || 3142 runtime_invisible_annotations != NULL) { 3143 annotations = MetadataFactory::new_array<u1>(_loader_data, 3144 runtime_visible_annotations_length + 3145 runtime_invisible_annotations_length, 3146 CHECK_(annotations)); 3147 if (runtime_visible_annotations != NULL) { 3148 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3149 annotations->at_put(i, runtime_visible_annotations[i]); 3150 } 3151 } 3152 if (runtime_invisible_annotations != NULL) { 3153 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3154 int append = runtime_visible_annotations_length+i; 3155 annotations->at_put(append, runtime_invisible_annotations[i]); 3156 } 3157 } 3158 } 3159 return annotations; 3160 } 3161 3162 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3163 TRAPS) { 3164 instanceKlassHandle super_klass; 3165 if (super_class_index == 0) { 3166 check_property(_class_name == vmSymbols::java_lang_Object(), 3167 "Invalid superclass index %u in class file %s", 3168 super_class_index, 3169 CHECK_NULL); 3170 } else { 3171 check_property(valid_klass_reference_at(super_class_index), 3172 "Invalid superclass index %u in class file %s", 3173 super_class_index, 3174 CHECK_NULL); 3175 // The class name should be legal because it is checked when parsing constant pool. 3176 // However, make sure it is not an array type. 3177 bool is_array = false; 3178 if (_cp->tag_at(super_class_index).is_klass()) { 3179 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3180 if (_need_verify) 3181 is_array = super_klass->oop_is_array(); 3182 } else if (_need_verify) { 3183 is_array = (_cp->klass_name_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3184 } 3185 if (_need_verify) { 3186 guarantee_property(!is_array, 3187 "Bad superclass name in class file %s", CHECK_NULL); 3188 } 3189 } 3190 return super_klass; 3191 } 3192 3193 3194 // Values needed for oopmap and InstanceKlass creation 3195 class FieldLayoutInfo : public StackObj { 3196 public: 3197 int* nonstatic_oop_offsets; 3198 unsigned int* nonstatic_oop_counts; 3199 unsigned int nonstatic_oop_map_count; 3200 unsigned int total_oop_map_count; 3201 int instance_size; 3202 int nonstatic_field_size; 3203 int static_field_size; 3204 bool has_nonstatic_fields; 3205 }; 3206 3207 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3208 void ClassFileParser::layout_fields(Handle class_loader, 3209 FieldAllocationCount* fac, 3210 ClassAnnotationCollector* parsed_annotations, 3211 FieldLayoutInfo* info, 3212 TRAPS) { 3213 3214 // Field size and offset computation 3215 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3216 int next_static_oop_offset; 3217 int next_static_double_offset; 3218 int next_static_word_offset; 3219 int next_static_short_offset; 3220 int next_static_byte_offset; 3221 int next_nonstatic_oop_offset; 3222 int next_nonstatic_double_offset; 3223 int next_nonstatic_word_offset; 3224 int next_nonstatic_short_offset; 3225 int next_nonstatic_byte_offset; 3226 int first_nonstatic_oop_offset; 3227 int next_nonstatic_field_offset; 3228 int next_nonstatic_padded_offset; 3229 3230 // Count the contended fields by type. 3231 // 3232 // We ignore static fields, because @Contended is not supported for them. 3233 // The layout code below will also ignore the static fields. 3234 int nonstatic_contended_count = 0; 3235 FieldAllocationCount fac_contended; 3236 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3237 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3238 if (fs.is_contended()) { 3239 fac_contended.count[atype]++; 3240 if (!fs.access_flags().is_static()) { 3241 nonstatic_contended_count++; 3242 } 3243 } 3244 } 3245 3246 3247 // Calculate the starting byte offsets 3248 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3249 next_static_double_offset = next_static_oop_offset + 3250 ((fac->count[STATIC_OOP]) * heapOopSize); 3251 if ( fac->count[STATIC_DOUBLE] && 3252 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3253 Universe::field_type_should_be_aligned(T_LONG)) ) { 3254 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3255 } 3256 3257 next_static_word_offset = next_static_double_offset + 3258 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3259 next_static_short_offset = next_static_word_offset + 3260 ((fac->count[STATIC_WORD]) * BytesPerInt); 3261 next_static_byte_offset = next_static_short_offset + 3262 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3263 3264 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3265 nonstatic_field_size * heapOopSize; 3266 3267 next_nonstatic_field_offset = nonstatic_fields_start; 3268 3269 bool is_contended_class = parsed_annotations->is_contended(); 3270 3271 // Class is contended, pad before all the fields 3272 if (is_contended_class) { 3273 next_nonstatic_field_offset += ContendedPaddingWidth; 3274 } 3275 3276 // Compute the non-contended fields count. 3277 // The packing code below relies on these counts to determine if some field 3278 // can be squeezed into the alignment gap. Contended fields are obviously 3279 // exempt from that. 3280 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3281 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3282 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3283 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3284 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3285 3286 // Total non-static fields count, including every contended field 3287 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3288 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3289 fac->count[NONSTATIC_OOP]; 3290 3291 bool super_has_nonstatic_fields = 3292 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3293 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3294 3295 3296 // Prepare list of oops for oop map generation. 3297 // 3298 // "offset" and "count" lists are describing the set of contiguous oop 3299 // regions. offset[i] is the start of the i-th region, which then has 3300 // count[i] oops following. Before we know how many regions are required, 3301 // we pessimistically allocate the maps to fit all the oops into the 3302 // distinct regions. 3303 // 3304 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3305 // to figure out if we still need to do this. 3306 int* nonstatic_oop_offsets; 3307 unsigned int* nonstatic_oop_counts; 3308 unsigned int nonstatic_oop_map_count = 0; 3309 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3310 3311 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3312 THREAD, int, max_nonstatic_oop_maps); 3313 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3314 THREAD, unsigned int, max_nonstatic_oop_maps); 3315 3316 first_nonstatic_oop_offset = 0; // will be set for first oop field 3317 3318 bool compact_fields = CompactFields; 3319 int allocation_style = FieldsAllocationStyle; 3320 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3321 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3322 allocation_style = 1; // Optimistic 3323 } 3324 3325 // The next classes have predefined hard-coded fields offsets 3326 // (see in JavaClasses::compute_hard_coded_offsets()). 3327 // Use default fields allocation order for them. 3328 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3329 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3330 _class_name == vmSymbols::java_lang_Class() || 3331 _class_name == vmSymbols::java_lang_ClassLoader() || 3332 _class_name == vmSymbols::java_lang_ref_Reference() || 3333 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3334 _class_name == vmSymbols::java_lang_StackTraceElement() || 3335 _class_name == vmSymbols::java_lang_String() || 3336 _class_name == vmSymbols::java_lang_Throwable() || 3337 _class_name == vmSymbols::java_lang_Boolean() || 3338 _class_name == vmSymbols::java_lang_Character() || 3339 _class_name == vmSymbols::java_lang_Float() || 3340 _class_name == vmSymbols::java_lang_Double() || 3341 _class_name == vmSymbols::java_lang_Byte() || 3342 _class_name == vmSymbols::java_lang_Short() || 3343 _class_name == vmSymbols::java_lang_Integer() || 3344 _class_name == vmSymbols::java_lang_Long())) { 3345 allocation_style = 0; // Allocate oops first 3346 compact_fields = false; // Don't compact fields 3347 } 3348 3349 // Rearrange fields for a given allocation style 3350 if( allocation_style == 0 ) { 3351 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3352 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3353 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3354 (nonstatic_oop_count * heapOopSize); 3355 } else if( allocation_style == 1 ) { 3356 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3357 next_nonstatic_double_offset = next_nonstatic_field_offset; 3358 } else if( allocation_style == 2 ) { 3359 // Fields allocation: oops fields in super and sub classes are together. 3360 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3361 _super_klass->nonstatic_oop_map_size() > 0 ) { 3362 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3363 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3364 OopMapBlock* last_map = first_map + map_count - 1; 3365 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3366 if (next_offset == next_nonstatic_field_offset) { 3367 allocation_style = 0; // allocate oops first 3368 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3369 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3370 (nonstatic_oop_count * heapOopSize); 3371 } 3372 } 3373 if( allocation_style == 2 ) { 3374 allocation_style = 1; // allocate oops last 3375 next_nonstatic_double_offset = next_nonstatic_field_offset; 3376 } 3377 } else { 3378 ShouldNotReachHere(); 3379 } 3380 3381 int nonstatic_oop_space_count = 0; 3382 int nonstatic_word_space_count = 0; 3383 int nonstatic_short_space_count = 0; 3384 int nonstatic_byte_space_count = 0; 3385 int nonstatic_oop_space_offset; 3386 int nonstatic_word_space_offset; 3387 int nonstatic_short_space_offset; 3388 int nonstatic_byte_space_offset; 3389 3390 // Try to squeeze some of the fields into the gaps due to 3391 // long/double alignment. 3392 if( nonstatic_double_count > 0 ) { 3393 int offset = next_nonstatic_double_offset; 3394 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3395 if( compact_fields && offset != next_nonstatic_double_offset ) { 3396 // Allocate available fields into the gap before double field. 3397 int length = next_nonstatic_double_offset - offset; 3398 assert(length == BytesPerInt, ""); 3399 nonstatic_word_space_offset = offset; 3400 if( nonstatic_word_count > 0 ) { 3401 nonstatic_word_count -= 1; 3402 nonstatic_word_space_count = 1; // Only one will fit 3403 length -= BytesPerInt; 3404 offset += BytesPerInt; 3405 } 3406 nonstatic_short_space_offset = offset; 3407 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3408 nonstatic_short_count -= 1; 3409 nonstatic_short_space_count += 1; 3410 length -= BytesPerShort; 3411 offset += BytesPerShort; 3412 } 3413 nonstatic_byte_space_offset = offset; 3414 while( length > 0 && nonstatic_byte_count > 0 ) { 3415 nonstatic_byte_count -= 1; 3416 nonstatic_byte_space_count += 1; 3417 length -= 1; 3418 } 3419 // Allocate oop field in the gap if there are no other fields for that. 3420 nonstatic_oop_space_offset = offset; 3421 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3422 allocation_style != 0 ) { // when oop fields not first 3423 nonstatic_oop_count -= 1; 3424 nonstatic_oop_space_count = 1; // Only one will fit 3425 length -= heapOopSize; 3426 offset += heapOopSize; 3427 } 3428 } 3429 } 3430 3431 next_nonstatic_word_offset = next_nonstatic_double_offset + 3432 (nonstatic_double_count * BytesPerLong); 3433 next_nonstatic_short_offset = next_nonstatic_word_offset + 3434 (nonstatic_word_count * BytesPerInt); 3435 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3436 (nonstatic_short_count * BytesPerShort); 3437 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3438 nonstatic_byte_count; 3439 3440 // let oops jump before padding with this allocation style 3441 if( allocation_style == 1 ) { 3442 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3443 if( nonstatic_oop_count > 0 ) { 3444 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3445 } 3446 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3447 } 3448 3449 // Iterate over fields again and compute correct offsets. 3450 // The field allocation type was temporarily stored in the offset slot. 3451 // oop fields are located before non-oop fields (static and non-static). 3452 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3453 3454 // skip already laid out fields 3455 if (fs.is_offset_set()) continue; 3456 3457 // contended instance fields are handled below 3458 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3459 3460 int real_offset; 3461 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3462 3463 // pack the rest of the fields 3464 switch (atype) { 3465 case STATIC_OOP: 3466 real_offset = next_static_oop_offset; 3467 next_static_oop_offset += heapOopSize; 3468 break; 3469 case STATIC_BYTE: 3470 real_offset = next_static_byte_offset; 3471 next_static_byte_offset += 1; 3472 break; 3473 case STATIC_SHORT: 3474 real_offset = next_static_short_offset; 3475 next_static_short_offset += BytesPerShort; 3476 break; 3477 case STATIC_WORD: 3478 real_offset = next_static_word_offset; 3479 next_static_word_offset += BytesPerInt; 3480 break; 3481 case STATIC_DOUBLE: 3482 real_offset = next_static_double_offset; 3483 next_static_double_offset += BytesPerLong; 3484 break; 3485 case NONSTATIC_OOP: 3486 if( nonstatic_oop_space_count > 0 ) { 3487 real_offset = nonstatic_oop_space_offset; 3488 nonstatic_oop_space_offset += heapOopSize; 3489 nonstatic_oop_space_count -= 1; 3490 } else { 3491 real_offset = next_nonstatic_oop_offset; 3492 next_nonstatic_oop_offset += heapOopSize; 3493 } 3494 // Update oop maps 3495 if( nonstatic_oop_map_count > 0 && 3496 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3497 real_offset - 3498 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3499 heapOopSize ) { 3500 // Extend current oop map 3501 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3502 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3503 } else { 3504 // Create new oop map 3505 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3506 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3507 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3508 nonstatic_oop_map_count += 1; 3509 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3510 first_nonstatic_oop_offset = real_offset; 3511 } 3512 } 3513 break; 3514 case NONSTATIC_BYTE: 3515 if( nonstatic_byte_space_count > 0 ) { 3516 real_offset = nonstatic_byte_space_offset; 3517 nonstatic_byte_space_offset += 1; 3518 nonstatic_byte_space_count -= 1; 3519 } else { 3520 real_offset = next_nonstatic_byte_offset; 3521 next_nonstatic_byte_offset += 1; 3522 } 3523 break; 3524 case NONSTATIC_SHORT: 3525 if( nonstatic_short_space_count > 0 ) { 3526 real_offset = nonstatic_short_space_offset; 3527 nonstatic_short_space_offset += BytesPerShort; 3528 nonstatic_short_space_count -= 1; 3529 } else { 3530 real_offset = next_nonstatic_short_offset; 3531 next_nonstatic_short_offset += BytesPerShort; 3532 } 3533 break; 3534 case NONSTATIC_WORD: 3535 if( nonstatic_word_space_count > 0 ) { 3536 real_offset = nonstatic_word_space_offset; 3537 nonstatic_word_space_offset += BytesPerInt; 3538 nonstatic_word_space_count -= 1; 3539 } else { 3540 real_offset = next_nonstatic_word_offset; 3541 next_nonstatic_word_offset += BytesPerInt; 3542 } 3543 break; 3544 case NONSTATIC_DOUBLE: 3545 real_offset = next_nonstatic_double_offset; 3546 next_nonstatic_double_offset += BytesPerLong; 3547 break; 3548 default: 3549 ShouldNotReachHere(); 3550 } 3551 fs.set_offset(real_offset); 3552 } 3553 3554 3555 // Handle the contended cases. 3556 // 3557 // Each contended field should not intersect the cache line with another contended field. 3558 // In the absence of alignment information, we end up with pessimistically separating 3559 // the fields with full-width padding. 3560 // 3561 // Additionally, this should not break alignment for the fields, so we round the alignment up 3562 // for each field. 3563 if (nonstatic_contended_count > 0) { 3564 3565 // if there is at least one contended field, we need to have pre-padding for them 3566 next_nonstatic_padded_offset += ContendedPaddingWidth; 3567 3568 // collect all contended groups 3569 BitMap bm(_cp->size()); 3570 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3571 // skip already laid out fields 3572 if (fs.is_offset_set()) continue; 3573 3574 if (fs.is_contended()) { 3575 bm.set_bit(fs.contended_group()); 3576 } 3577 } 3578 3579 int current_group = -1; 3580 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3581 3582 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3583 3584 // skip already laid out fields 3585 if (fs.is_offset_set()) continue; 3586 3587 // skip non-contended fields and fields from different group 3588 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3589 3590 // handle statics below 3591 if (fs.access_flags().is_static()) continue; 3592 3593 int real_offset; 3594 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3595 3596 switch (atype) { 3597 case NONSTATIC_BYTE: 3598 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3599 real_offset = next_nonstatic_padded_offset; 3600 next_nonstatic_padded_offset += 1; 3601 break; 3602 3603 case NONSTATIC_SHORT: 3604 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3605 real_offset = next_nonstatic_padded_offset; 3606 next_nonstatic_padded_offset += BytesPerShort; 3607 break; 3608 3609 case NONSTATIC_WORD: 3610 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3611 real_offset = next_nonstatic_padded_offset; 3612 next_nonstatic_padded_offset += BytesPerInt; 3613 break; 3614 3615 case NONSTATIC_DOUBLE: 3616 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3617 real_offset = next_nonstatic_padded_offset; 3618 next_nonstatic_padded_offset += BytesPerLong; 3619 break; 3620 3621 case NONSTATIC_OOP: 3622 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3623 real_offset = next_nonstatic_padded_offset; 3624 next_nonstatic_padded_offset += heapOopSize; 3625 3626 // Create new oop map 3627 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3628 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3629 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3630 nonstatic_oop_map_count += 1; 3631 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3632 first_nonstatic_oop_offset = real_offset; 3633 } 3634 break; 3635 3636 default: 3637 ShouldNotReachHere(); 3638 } 3639 3640 if (fs.contended_group() == 0) { 3641 // Contended group defines the equivalence class over the fields: 3642 // the fields within the same contended group are not inter-padded. 3643 // The only exception is default group, which does not incur the 3644 // equivalence, and so requires intra-padding. 3645 next_nonstatic_padded_offset += ContendedPaddingWidth; 3646 } 3647 3648 fs.set_offset(real_offset); 3649 } // for 3650 3651 // Start laying out the next group. 3652 // Note that this will effectively pad the last group in the back; 3653 // this is expected to alleviate memory contention effects for 3654 // subclass fields and/or adjacent object. 3655 // If this was the default group, the padding is already in place. 3656 if (current_group != 0) { 3657 next_nonstatic_padded_offset += ContendedPaddingWidth; 3658 } 3659 } 3660 3661 // handle static fields 3662 } 3663 3664 // Entire class is contended, pad in the back. 3665 // This helps to alleviate memory contention effects for subclass fields 3666 // and/or adjacent object. 3667 if (is_contended_class) { 3668 next_nonstatic_padded_offset += ContendedPaddingWidth; 3669 } 3670 3671 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3672 3673 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3674 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3675 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3676 3677 int static_field_size = (static_fields_end - 3678 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3679 nonstatic_field_size = nonstatic_field_size + 3680 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3681 3682 int instance_size = align_object_size(instance_end / wordSize); 3683 3684 assert(instance_size == align_object_size(align_size_up( 3685 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3686 wordSize) / wordSize), "consistent layout helper value"); 3687 3688 // Invariant: nonstatic_field end/start should only change if there are 3689 // nonstatic fields in the class, or if the class is contended. We compare 3690 // against the non-aligned value, so that end alignment will not fail the 3691 // assert without actually having the fields. 3692 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3693 is_contended_class || 3694 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3695 3696 // Number of non-static oop map blocks allocated at end of klass. 3697 const unsigned int total_oop_map_count = 3698 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3699 first_nonstatic_oop_offset); 3700 3701 #ifndef PRODUCT 3702 if (PrintFieldLayout) { 3703 print_field_layout(_class_name, 3704 _fields, 3705 _cp, 3706 instance_size, 3707 nonstatic_fields_start, 3708 nonstatic_fields_end, 3709 static_fields_end); 3710 } 3711 3712 #endif 3713 // Pass back information needed for InstanceKlass creation 3714 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3715 info->nonstatic_oop_counts = nonstatic_oop_counts; 3716 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3717 info->total_oop_map_count = total_oop_map_count; 3718 info->instance_size = instance_size; 3719 info->static_field_size = static_field_size; 3720 info->nonstatic_field_size = nonstatic_field_size; 3721 info->has_nonstatic_fields = has_nonstatic_fields; 3722 } 3723 3724 3725 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3726 ClassLoaderData* loader_data, 3727 Handle protection_domain, 3728 KlassHandle host_klass, 3729 GrowableArray<Handle>* cp_patches, 3730 TempNewSymbol& parsed_name, 3731 bool verify, 3732 TRAPS) { 3733 3734 // When a retransformable agent is attached, JVMTI caches the 3735 // class bytes that existed before the first retransformation. 3736 // If RedefineClasses() was used before the retransformable 3737 // agent attached, then the cached class bytes may not be the 3738 // original class bytes. 3739 JvmtiCachedClassFileData *cached_class_file = NULL; 3740 Handle class_loader(THREAD, loader_data->class_loader()); 3741 bool has_default_methods = false; 3742 ResourceMark rm(THREAD); 3743 3744 ClassFileStream* cfs = stream(); 3745 // Timing 3746 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3747 JavaThread* jt = (JavaThread*) THREAD; 3748 3749 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3750 ClassLoader::perf_class_parse_selftime(), 3751 NULL, 3752 jt->get_thread_stat()->perf_recursion_counts_addr(), 3753 jt->get_thread_stat()->perf_timers_addr(), 3754 PerfClassTraceTime::PARSE_CLASS); 3755 3756 init_parsed_class_attributes(loader_data); 3757 3758 if (JvmtiExport::should_post_class_file_load_hook()) { 3759 // Get the cached class file bytes (if any) from the class that 3760 // is being redefined or retransformed. We use jvmti_thread_state() 3761 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3762 // a JvmtiThreadState any earlier than necessary. This will help 3763 // avoid the bug described by 7126851. 3764 JvmtiThreadState *state = jt->jvmti_thread_state(); 3765 if (state != NULL) { 3766 KlassHandle *h_class_being_redefined = 3767 state->get_class_being_redefined(); 3768 if (h_class_being_redefined != NULL) { 3769 instanceKlassHandle ikh_class_being_redefined = 3770 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3771 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3772 } 3773 } 3774 3775 unsigned char* ptr = cfs->buffer(); 3776 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3777 3778 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3779 &ptr, &end_ptr, &cached_class_file); 3780 3781 if (ptr != cfs->buffer()) { 3782 // JVMTI agent has modified class file data. 3783 // Set new class file stream using JVMTI agent modified 3784 // class file data. 3785 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3786 set_stream(cfs); 3787 } 3788 } 3789 3790 _host_klass = host_klass; 3791 _cp_patches = cp_patches; 3792 3793 instanceKlassHandle nullHandle; 3794 3795 // Figure out whether we can skip format checking (matching classic VM behavior) 3796 if (DumpSharedSpaces) { 3797 // verify == true means it's a 'remote' class (i.e., non-boot class) 3798 // Verification decision is based on BytecodeVerificationRemote flag 3799 // for those classes. 3800 _need_verify = (verify) ? BytecodeVerificationRemote : 3801 BytecodeVerificationLocal; 3802 } else { 3803 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3804 } 3805 3806 // Set the verify flag in stream 3807 cfs->set_verify(_need_verify); 3808 3809 // Save the class file name for easier error message printing. 3810 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3811 3812 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3813 // Magic value 3814 u4 magic = cfs->get_u4_fast(); 3815 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3816 "Incompatible magic value %u in class file %s", 3817 magic, CHECK_(nullHandle)); 3818 3819 // Version numbers 3820 u2 minor_version = cfs->get_u2_fast(); 3821 u2 major_version = cfs->get_u2_fast(); 3822 3823 if (DumpSharedSpaces && major_version < JAVA_1_5_VERSION) { 3824 ResourceMark rm; 3825 warning("Pre JDK 1.5 class not supported by CDS: %u.%u %s", 3826 major_version, minor_version, name->as_C_string()); 3827 Exceptions::fthrow( 3828 THREAD_AND_LOCATION, 3829 vmSymbols::java_lang_UnsupportedClassVersionError(), 3830 "Unsupported major.minor version for dump time %u.%u", 3831 major_version, 3832 minor_version); 3833 } 3834 3835 // Check version numbers - we check this even with verifier off 3836 if (!is_supported_version(major_version, minor_version)) { 3837 if (name == NULL) { 3838 Exceptions::fthrow( 3839 THREAD_AND_LOCATION, 3840 vmSymbols::java_lang_UnsupportedClassVersionError(), 3841 "Unsupported class file version %u.%u, " 3842 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3843 major_version, 3844 minor_version, 3845 JAVA_MAX_SUPPORTED_VERSION, 3846 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3847 } else { 3848 ResourceMark rm(THREAD); 3849 Exceptions::fthrow( 3850 THREAD_AND_LOCATION, 3851 vmSymbols::java_lang_UnsupportedClassVersionError(), 3852 "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " 3853 "this version of the Java Runtime only recognizes class file versions up to %u.%u", 3854 name->as_C_string(), 3855 major_version, 3856 minor_version, 3857 JAVA_MAX_SUPPORTED_VERSION, 3858 JAVA_MAX_SUPPORTED_MINOR_VERSION); 3859 } 3860 return nullHandle; 3861 } 3862 3863 _major_version = major_version; 3864 _minor_version = minor_version; 3865 3866 3867 // Check if verification needs to be relaxed for this class file 3868 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3869 _relax_verify = Verifier::relax_verify_for(class_loader()); 3870 3871 // Constant pool 3872 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3873 3874 int cp_size = cp->length(); 3875 3876 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3877 3878 // Access flags 3879 AccessFlags access_flags; 3880 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3881 3882 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3883 // Set abstract bit for old class files for backward compatibility 3884 flags |= JVM_ACC_ABSTRACT; 3885 } 3886 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3887 access_flags.set_flags(flags); 3888 3889 // This class and superclass 3890 u2 this_class_index = cfs->get_u2_fast(); 3891 check_property( 3892 valid_cp_range(this_class_index, cp_size) && 3893 cp->tag_at(this_class_index).is_unresolved_klass(), 3894 "Invalid this class index %u in constant pool in class file %s", 3895 this_class_index, CHECK_(nullHandle)); 3896 3897 Symbol* class_name = cp->klass_name_at(this_class_index); 3898 assert(class_name != NULL, "class_name can't be null"); 3899 3900 // It's important to set parsed_name *before* resolving the super class. 3901 // (it's used for cleanup by the caller if parsing fails) 3902 parsed_name = class_name; 3903 // parsed_name is returned and can be used if there's an error, so add to 3904 // its reference count. Caller will decrement the refcount. 3905 parsed_name->increment_refcount(); 3906 3907 // Update _class_name which could be null previously to be class_name 3908 _class_name = class_name; 3909 3910 // Don't need to check whether this class name is legal or not. 3911 // It has been checked when constant pool is parsed. 3912 // However, make sure it is not an array type. 3913 if (_need_verify) { 3914 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3915 "Bad class name in class file %s", 3916 CHECK_(nullHandle)); 3917 } 3918 3919 Klass* preserve_this_klass; // for storing result across HandleMark 3920 3921 // release all handles when parsing is done 3922 { HandleMark hm(THREAD); 3923 3924 // Checks if name in class file matches requested name 3925 if (name != NULL && class_name != name) { 3926 ResourceMark rm(THREAD); 3927 Exceptions::fthrow( 3928 THREAD_AND_LOCATION, 3929 vmSymbols::java_lang_NoClassDefFoundError(), 3930 "%s (wrong name: %s)", 3931 name->as_C_string(), 3932 class_name->as_C_string() 3933 ); 3934 return nullHandle; 3935 } 3936 3937 if (TraceClassLoadingPreorder) { 3938 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3939 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3940 tty->print_cr("]"); 3941 } 3942 #if INCLUDE_CDS 3943 if (DumpLoadedClassList != NULL && cfs->source() != NULL && classlist_file->is_open()) { 3944 // Only dump the classes that can be stored into CDS archive 3945 if (SystemDictionaryShared::is_sharing_possible(loader_data)) { 3946 if (name != NULL) { 3947 ResourceMark rm(THREAD); 3948 classlist_file->print_cr("%s", name->as_C_string()); 3949 classlist_file->flush(); 3950 } 3951 } 3952 } 3953 #endif 3954 3955 u2 super_class_index = cfs->get_u2_fast(); 3956 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3957 CHECK_NULL); 3958 3959 // Interfaces 3960 u2 itfs_len = cfs->get_u2_fast(); 3961 Array<Klass*>* local_interfaces = 3962 parse_interfaces(itfs_len, protection_domain, _class_name, 3963 &has_default_methods, CHECK_(nullHandle)); 3964 3965 u2 java_fields_count = 0; 3966 // Fields (offsets are filled in later) 3967 FieldAllocationCount fac; 3968 Array<u2>* fields = parse_fields(class_name, 3969 access_flags.is_interface(), 3970 &fac, &java_fields_count, 3971 CHECK_(nullHandle)); 3972 // Methods 3973 bool has_final_method = false; 3974 AccessFlags promoted_flags; 3975 promoted_flags.set_flags(0); 3976 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 3977 &promoted_flags, 3978 &has_final_method, 3979 &has_default_methods, 3980 CHECK_(nullHandle)); 3981 3982 // Additional attributes 3983 ClassAnnotationCollector parsed_annotations; 3984 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 3985 3986 // Make sure this is the end of class file stream 3987 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3988 3989 // We check super class after class file is parsed and format is checked 3990 if (super_class_index > 0 && super_klass.is_null()) { 3991 Symbol* sk = cp->klass_name_at(super_class_index); 3992 if (access_flags.is_interface()) { 3993 // Before attempting to resolve the superclass, check for class format 3994 // errors not checked yet. 3995 guarantee_property(sk == vmSymbols::java_lang_Object(), 3996 "Interfaces must have java.lang.Object as superclass in class file %s", 3997 CHECK_(nullHandle)); 3998 } 3999 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 4000 class_loader, 4001 protection_domain, 4002 true, 4003 CHECK_(nullHandle)); 4004 4005 KlassHandle kh (THREAD, k); 4006 super_klass = instanceKlassHandle(THREAD, kh()); 4007 } 4008 if (super_klass.not_null()) { 4009 4010 if (super_klass->has_default_methods()) { 4011 has_default_methods = true; 4012 } 4013 4014 if (super_klass->is_interface()) { 4015 ResourceMark rm(THREAD); 4016 Exceptions::fthrow( 4017 THREAD_AND_LOCATION, 4018 vmSymbols::java_lang_IncompatibleClassChangeError(), 4019 "class %s has interface %s as super class", 4020 class_name->as_klass_external_name(), 4021 super_klass->external_name() 4022 ); 4023 return nullHandle; 4024 } 4025 // Make sure super class is not final 4026 if (super_klass->is_final()) { 4027 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 4028 } 4029 } 4030 4031 // save super klass for error handling. 4032 _super_klass = super_klass; 4033 4034 // Compute the transitive list of all unique interfaces implemented by this class 4035 _transitive_interfaces = 4036 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 4037 4038 // sort methods 4039 intArray* method_ordering = sort_methods(methods); 4040 4041 // promote flags from parse_methods() to the klass' flags 4042 access_flags.add_promoted_flags(promoted_flags.as_int()); 4043 4044 // Size of Java vtable (in words) 4045 int vtable_size = 0; 4046 int itable_size = 0; 4047 int num_miranda_methods = 0; 4048 4049 GrowableArray<Method*> all_mirandas(20); 4050 4051 klassVtable::compute_vtable_size_and_num_mirandas( 4052 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 4053 access_flags, class_loader, class_name, local_interfaces, 4054 CHECK_(nullHandle)); 4055 4056 // Size of Java itable (in words) 4057 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 4058 4059 FieldLayoutInfo info; 4060 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 4061 4062 int total_oop_map_size2 = 4063 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 4064 4065 // Compute reference type 4066 ReferenceType rt; 4067 if (super_klass() == NULL) { 4068 rt = REF_NONE; 4069 } else { 4070 rt = super_klass->reference_type(); 4071 } 4072 4073 // We can now create the basic Klass* for this klass 4074 _klass = InstanceKlass::allocate_instance_klass(loader_data, 4075 vtable_size, 4076 itable_size, 4077 info.static_field_size, 4078 total_oop_map_size2, 4079 rt, 4080 access_flags, 4081 name, 4082 super_klass(), 4083 !host_klass.is_null(), 4084 CHECK_(nullHandle)); 4085 instanceKlassHandle this_klass (THREAD, _klass); 4086 4087 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 4088 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 4089 "sanity"); 4090 4091 // Fill in information already parsed 4092 this_klass->set_should_verify_class(verify); 4093 jint lh = Klass::instance_layout_helper(info.instance_size, false); 4094 this_klass->set_layout_helper(lh); 4095 assert(this_klass->oop_is_instance(), "layout is correct"); 4096 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 4097 // Not yet: supers are done below to support the new subtype-checking fields 4098 //this_klass->set_super(super_klass()); 4099 this_klass->set_class_loader_data(loader_data); 4100 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 4101 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 4102 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 4103 4104 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 4105 4106 if (has_final_method) { 4107 this_klass->set_has_final_method(); 4108 } 4109 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 4110 // The InstanceKlass::_methods_jmethod_ids cache 4111 // is managed on the assumption that the initial cache 4112 // size is equal to the number of methods in the class. If 4113 // that changes, then InstanceKlass::idnum_can_increment() 4114 // has to be changed accordingly. 4115 this_klass->set_initial_method_idnum(methods->length()); 4116 this_klass->set_name(cp->klass_name_at(this_class_index)); 4117 if (is_anonymous()) // I am well known to myself 4118 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 4119 4120 this_klass->set_minor_version(minor_version); 4121 this_klass->set_major_version(major_version); 4122 this_klass->set_has_default_methods(has_default_methods); 4123 4124 if (!host_klass.is_null()) { 4125 assert (this_klass->is_anonymous(), "should be the same"); 4126 this_klass->set_host_klass(host_klass()); 4127 } 4128 4129 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4130 // (We used to do this lazily, but now we query it in Rewriter, 4131 // which is eagerly done for every method, so we might as well do it now, 4132 // when everything is fresh in memory.) 4133 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { 4134 for (int j = 0; j < methods->length(); j++) { 4135 methods->at(j)->init_intrinsic_id(); 4136 } 4137 } 4138 4139 if (cached_class_file != NULL) { 4140 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4141 this_klass->set_cached_class_file(cached_class_file); 4142 } 4143 4144 // Fill in field values obtained by parse_classfile_attributes 4145 if (parsed_annotations.has_any_annotations()) 4146 parsed_annotations.apply_to(this_klass); 4147 apply_parsed_class_attributes(this_klass); 4148 4149 // Miranda methods 4150 if ((num_miranda_methods > 0) || 4151 // if this class introduced new miranda methods or 4152 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4153 // super class exists and this class inherited miranda methods 4154 ) { 4155 this_klass->set_has_miranda_methods(); // then set a flag 4156 } 4157 4158 // Fill in information needed to compute superclasses. 4159 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4160 4161 // Initialize itable offset tables 4162 klassItable::setup_itable_offset_table(this_klass); 4163 4164 // Compute transitive closure of interfaces this class implements 4165 // Do final class setup 4166 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4167 4168 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4169 set_precomputed_flags(this_klass); 4170 4171 // reinitialize modifiers, using the InnerClasses attribute 4172 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4173 this_klass->set_modifier_flags(computed_modifiers); 4174 4175 // check if this class can access its super class 4176 check_super_class_access(this_klass, CHECK_(nullHandle)); 4177 4178 // check if this class can access its superinterfaces 4179 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4180 4181 // check if this class overrides any final method 4182 check_final_method_override(this_klass, CHECK_(nullHandle)); 4183 4184 // check that if this class is an interface then it doesn't have static methods 4185 if (this_klass->is_interface()) { 4186 /* An interface in a JAVA 8 classfile can be static */ 4187 if (_major_version < JAVA_8_VERSION) { 4188 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4189 } 4190 } 4191 4192 // Allocate mirror and initialize static fields 4193 java_lang_Class::create_mirror(this_klass, class_loader, protection_domain, 4194 CHECK_(nullHandle)); 4195 4196 // Generate any default methods - default methods are interface methods 4197 // that have a default implementation. This is new with Lambda project. 4198 if (has_default_methods ) { 4199 DefaultMethods::generate_default_methods( 4200 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4201 } 4202 4203 // Update the loader_data graph. 4204 record_defined_class_dependencies(this_klass, CHECK_NULL); 4205 4206 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4207 false /* not shared class */); 4208 4209 if (TraceClassLoading) { 4210 ResourceMark rm; 4211 // print in a single call to reduce interleaving of output 4212 if (cfs->source() != NULL) { 4213 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4214 cfs->source()); 4215 } else if (class_loader.is_null()) { 4216 Klass* caller = 4217 THREAD->is_Java_thread() 4218 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 4219 : NULL; 4220 // caller can be NULL, for example, during a JVMTI VM_Init hook 4221 if (caller != NULL) { 4222 tty->print("[Loaded %s by instance of %s]\n", 4223 this_klass->external_name(), 4224 InstanceKlass::cast(caller)->external_name()); 4225 } else { 4226 tty->print("[Loaded %s]\n", this_klass->external_name()); 4227 } 4228 } else { 4229 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4230 InstanceKlass::cast(class_loader->klass())->external_name()); 4231 } 4232 } 4233 4234 if (TraceClassResolution) { 4235 ResourceMark rm; 4236 // print out the superclass. 4237 const char * from = this_klass()->external_name(); 4238 if (this_klass->java_super() != NULL) { 4239 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4240 } 4241 // print out each of the interface classes referred to by this class. 4242 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4243 if (local_interfaces != NULL) { 4244 int length = local_interfaces->length(); 4245 for (int i = 0; i < length; i++) { 4246 Klass* k = local_interfaces->at(i); 4247 InstanceKlass* to_class = InstanceKlass::cast(k); 4248 const char * to = to_class->external_name(); 4249 tty->print("RESOLVE %s %s (interface)\n", from, to); 4250 } 4251 } 4252 } 4253 4254 // preserve result across HandleMark 4255 preserve_this_klass = this_klass(); 4256 } 4257 4258 // Create new handle outside HandleMark (might be needed for 4259 // Extended Class Redefinition) 4260 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4261 debug_only(this_klass->verify();) 4262 4263 // Clear class if no error has occurred so destructor doesn't deallocate it 4264 _klass = NULL; 4265 return this_klass; 4266 } 4267 4268 // Destructor to clean up if there's an error 4269 ClassFileParser::~ClassFileParser() { 4270 MetadataFactory::free_metadata(_loader_data, _cp); 4271 MetadataFactory::free_array<u2>(_loader_data, _fields); 4272 4273 // Free methods 4274 InstanceKlass::deallocate_methods(_loader_data, _methods); 4275 4276 // beware of the Universe::empty_blah_array!! 4277 if (_inner_classes != Universe::the_empty_short_array()) { 4278 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4279 } 4280 4281 // Free interfaces 4282 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4283 _local_interfaces, _transitive_interfaces); 4284 4285 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4286 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4287 Annotations::free_contents(_loader_data, _fields_annotations); 4288 Annotations::free_contents(_loader_data, _fields_type_annotations); 4289 4290 clear_class_metadata(); 4291 4292 // deallocate the klass if already created. Don't directly deallocate, but add 4293 // to the deallocate list so that the klass is removed from the CLD::_klasses list 4294 // at a safepoint. 4295 if (_klass != NULL) { 4296 _loader_data->add_to_deallocate_list(_klass); 4297 } 4298 _klass = NULL; 4299 } 4300 4301 void ClassFileParser::print_field_layout(Symbol* name, 4302 Array<u2>* fields, 4303 constantPoolHandle cp, 4304 int instance_size, 4305 int instance_fields_start, 4306 int instance_fields_end, 4307 int static_fields_end) { 4308 tty->print("%s: field layout\n", name->as_klass_external_name()); 4309 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4310 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4311 if (!fs.access_flags().is_static()) { 4312 tty->print(" @%3d \"%s\" %s\n", 4313 fs.offset(), 4314 fs.name()->as_klass_external_name(), 4315 fs.signature()->as_klass_external_name()); 4316 } 4317 } 4318 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4319 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4320 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4321 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4322 if (fs.access_flags().is_static()) { 4323 tty->print(" @%3d \"%s\" %s\n", 4324 fs.offset(), 4325 fs.name()->as_klass_external_name(), 4326 fs.signature()->as_klass_external_name()); 4327 } 4328 } 4329 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4330 tty->print("\n"); 4331 } 4332 4333 unsigned int 4334 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4335 unsigned int nonstatic_oop_map_count, 4336 int first_nonstatic_oop_offset) { 4337 unsigned int map_count = 4338 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4339 if (nonstatic_oop_map_count > 0) { 4340 // We have oops to add to map 4341 if (map_count == 0) { 4342 map_count = nonstatic_oop_map_count; 4343 } else { 4344 // Check whether we should add a new map block or whether the last one can 4345 // be extended 4346 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4347 OopMapBlock* const last_map = first_map + map_count - 1; 4348 4349 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4350 if (next_offset == first_nonstatic_oop_offset) { 4351 // There is no gap bettwen superklass's last oop field and first 4352 // local oop field, merge maps. 4353 nonstatic_oop_map_count -= 1; 4354 } else { 4355 // Superklass didn't end with a oop field, add extra maps 4356 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4357 } 4358 map_count += nonstatic_oop_map_count; 4359 } 4360 } 4361 return map_count; 4362 } 4363 4364 4365 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4366 unsigned int nonstatic_oop_map_count, 4367 int* nonstatic_oop_offsets, 4368 unsigned int* nonstatic_oop_counts) { 4369 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4370 const InstanceKlass* const super = k->superklass(); 4371 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4372 if (super_count > 0) { 4373 // Copy maps from superklass 4374 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4375 for (unsigned int i = 0; i < super_count; ++i) { 4376 *this_oop_map++ = *super_oop_map++; 4377 } 4378 } 4379 4380 if (nonstatic_oop_map_count > 0) { 4381 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4382 // The counts differ because there is no gap between superklass's last oop 4383 // field and the first local oop field. Extend the last oop map copied 4384 // from the superklass instead of creating new one. 4385 nonstatic_oop_map_count--; 4386 nonstatic_oop_offsets++; 4387 this_oop_map--; 4388 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4389 this_oop_map++; 4390 } 4391 4392 // Add new map blocks, fill them 4393 while (nonstatic_oop_map_count-- > 0) { 4394 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4395 this_oop_map->set_count(*nonstatic_oop_counts++); 4396 this_oop_map++; 4397 } 4398 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4399 this_oop_map, "sanity"); 4400 } 4401 } 4402 4403 4404 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4405 Klass* super = k->super(); 4406 4407 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4408 // in which case we don't have to register objects as finalizable 4409 if (!_has_empty_finalizer) { 4410 if (_has_finalizer || 4411 (super != NULL && super->has_finalizer())) { 4412 k->set_has_finalizer(); 4413 } 4414 } 4415 4416 #ifdef ASSERT 4417 bool f = false; 4418 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4419 vmSymbols::void_method_signature()); 4420 if (m != NULL && !m->is_empty_method()) { 4421 f = true; 4422 } 4423 4424 // Spec doesn't prevent agent from redefinition of empty finalizer. 4425 // Despite the fact that it's generally bad idea and redefined finalizer 4426 // will not work as expected we shouldn't abort vm in this case 4427 if (!k->has_redefined_this_or_super()) { 4428 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4429 } 4430 #endif 4431 4432 // Check if this klass supports the java.lang.Cloneable interface 4433 if (SystemDictionary::Cloneable_klass_loaded()) { 4434 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4435 k->set_is_cloneable(); 4436 } 4437 } 4438 4439 // Check if this klass has a vanilla default constructor 4440 if (super == NULL) { 4441 // java.lang.Object has empty default constructor 4442 k->set_has_vanilla_constructor(); 4443 } else { 4444 if (super->has_vanilla_constructor() && 4445 _has_vanilla_constructor) { 4446 k->set_has_vanilla_constructor(); 4447 } 4448 #ifdef ASSERT 4449 bool v = false; 4450 if (super->has_vanilla_constructor()) { 4451 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4452 ), vmSymbols::void_method_signature()); 4453 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4454 v = true; 4455 } 4456 } 4457 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4458 #endif 4459 } 4460 4461 // If it cannot be fast-path allocated, set a bit in the layout helper. 4462 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4463 assert(k->size_helper() > 0, "layout_helper is initialized"); 4464 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4465 || k->is_abstract() || k->is_interface() 4466 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4467 || k->size_helper() >= FastAllocateSizeLimit) { 4468 // Forbid fast-path allocation. 4469 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4470 k->set_layout_helper(lh); 4471 } 4472 } 4473 4474 // Attach super classes and interface classes to class loader data 4475 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4476 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4477 if (defining_loader_data->is_the_null_class_loader_data()) { 4478 // Dependencies to null class loader data are implicit. 4479 return; 4480 } else { 4481 // add super class dependency 4482 Klass* super = defined_klass->super(); 4483 if (super != NULL) { 4484 defining_loader_data->record_dependency(super, CHECK); 4485 } 4486 4487 // add super interface dependencies 4488 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4489 if (local_interfaces != NULL) { 4490 int length = local_interfaces->length(); 4491 for (int i = 0; i < length; i++) { 4492 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4493 } 4494 } 4495 } 4496 } 4497 4498 // utility methods for appending an array with check for duplicates 4499 4500 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4501 // iterate over new interfaces 4502 for (int i = 0; i < ifs->length(); i++) { 4503 Klass* e = ifs->at(i); 4504 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4505 // add new interface 4506 result->append_if_missing(e); 4507 } 4508 } 4509 4510 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4511 instanceKlassHandle super, 4512 Array<Klass*>* local_ifs, TRAPS) { 4513 // Compute maximum size for transitive interfaces 4514 int max_transitive_size = 0; 4515 int super_size = 0; 4516 // Add superclass transitive interfaces size 4517 if (super.not_null()) { 4518 super_size = super->transitive_interfaces()->length(); 4519 max_transitive_size += super_size; 4520 } 4521 // Add local interfaces' super interfaces 4522 int local_size = local_ifs->length(); 4523 for (int i = 0; i < local_size; i++) { 4524 Klass* l = local_ifs->at(i); 4525 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4526 } 4527 // Finally add local interfaces 4528 max_transitive_size += local_size; 4529 // Construct array 4530 if (max_transitive_size == 0) { 4531 // no interfaces, use canonicalized array 4532 return Universe::the_empty_klass_array(); 4533 } else if (max_transitive_size == super_size) { 4534 // no new local interfaces added, share superklass' transitive interface array 4535 return super->transitive_interfaces(); 4536 } else if (max_transitive_size == local_size) { 4537 // only local interfaces added, share local interface array 4538 return local_ifs; 4539 } else { 4540 ResourceMark rm; 4541 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4542 4543 // Copy down from superclass 4544 if (super.not_null()) { 4545 append_interfaces(result, super->transitive_interfaces()); 4546 } 4547 4548 // Copy down from local interfaces' superinterfaces 4549 for (int i = 0; i < local_ifs->length(); i++) { 4550 Klass* l = local_ifs->at(i); 4551 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4552 } 4553 // Finally add local interfaces 4554 append_interfaces(result, local_ifs); 4555 4556 // length will be less than the max_transitive_size if duplicates were removed 4557 int length = result->length(); 4558 assert(length <= max_transitive_size, "just checking"); 4559 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4560 for (int i = 0; i < length; i++) { 4561 Klass* e = result->at(i); 4562 assert(e != NULL, "just checking"); 4563 new_result->at_put(i, e); 4564 } 4565 return new_result; 4566 } 4567 } 4568 4569 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4570 Klass* super = this_klass->super(); 4571 if ((super != NULL) && 4572 (!Reflection::verify_class_access(this_klass(), super, false))) { 4573 ResourceMark rm(THREAD); 4574 Exceptions::fthrow( 4575 THREAD_AND_LOCATION, 4576 vmSymbols::java_lang_IllegalAccessError(), 4577 "class %s cannot access its superclass %s", 4578 this_klass->external_name(), 4579 InstanceKlass::cast(super)->external_name() 4580 ); 4581 return; 4582 } 4583 } 4584 4585 4586 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4587 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4588 int lng = local_interfaces->length(); 4589 for (int i = lng - 1; i >= 0; i--) { 4590 Klass* k = local_interfaces->at(i); 4591 assert (k != NULL && k->is_interface(), "invalid interface"); 4592 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4593 ResourceMark rm(THREAD); 4594 Exceptions::fthrow( 4595 THREAD_AND_LOCATION, 4596 vmSymbols::java_lang_IllegalAccessError(), 4597 "class %s cannot access its superinterface %s", 4598 this_klass->external_name(), 4599 InstanceKlass::cast(k)->external_name() 4600 ); 4601 return; 4602 } 4603 } 4604 } 4605 4606 4607 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4608 Array<Method*>* methods = this_klass->methods(); 4609 int num_methods = methods->length(); 4610 4611 // go thru each method and check if it overrides a final method 4612 for (int index = 0; index < num_methods; index++) { 4613 Method* m = methods->at(index); 4614 4615 // skip private, static, and <init> methods 4616 if ((!m->is_private() && !m->is_static()) && 4617 (m->name() != vmSymbols::object_initializer_name())) { 4618 4619 Symbol* name = m->name(); 4620 Symbol* signature = m->signature(); 4621 Klass* k = this_klass->super(); 4622 Method* super_m = NULL; 4623 while (k != NULL) { 4624 // skip supers that don't have final methods. 4625 if (k->has_final_method()) { 4626 // lookup a matching method in the super class hierarchy 4627 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4628 if (super_m == NULL) { 4629 break; // didn't find any match; get out 4630 } 4631 4632 if (super_m->is_final() && !super_m->is_static() && 4633 // matching method in super is final, and not static 4634 (Reflection::verify_field_access(this_klass(), 4635 super_m->method_holder(), 4636 super_m->method_holder(), 4637 super_m->access_flags(), false)) 4638 // this class can access super final method and therefore override 4639 ) { 4640 ResourceMark rm(THREAD); 4641 Exceptions::fthrow( 4642 THREAD_AND_LOCATION, 4643 vmSymbols::java_lang_VerifyError(), 4644 "class %s overrides final method %s.%s%s", 4645 this_klass->external_name(), 4646 super_m->method_holder()->external_name(), 4647 name->as_C_string(), 4648 signature->as_C_string() 4649 ); 4650 return; 4651 } 4652 4653 // continue to look from super_m's holder's super. 4654 k = super_m->method_holder()->super(); 4655 continue; 4656 } 4657 4658 k = k->super(); 4659 } 4660 } 4661 } 4662 } 4663 4664 4665 // assumes that this_klass is an interface 4666 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4667 assert(this_klass->is_interface(), "not an interface"); 4668 Array<Method*>* methods = this_klass->methods(); 4669 int num_methods = methods->length(); 4670 4671 for (int index = 0; index < num_methods; index++) { 4672 Method* m = methods->at(index); 4673 // if m is static and not the init method, throw a verify error 4674 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4675 ResourceMark rm(THREAD); 4676 Exceptions::fthrow( 4677 THREAD_AND_LOCATION, 4678 vmSymbols::java_lang_VerifyError(), 4679 "Illegal static method %s in interface %s", 4680 m->name()->as_C_string(), 4681 this_klass->external_name() 4682 ); 4683 return; 4684 } 4685 } 4686 } 4687 4688 // utility methods for format checking 4689 4690 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4691 if (!_need_verify) { return; } 4692 4693 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4694 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4695 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4696 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4697 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4698 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4699 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4700 4701 if ((is_abstract && is_final) || 4702 (is_interface && !is_abstract) || 4703 (is_interface && major_gte_15 && (is_super || is_enum)) || 4704 (!is_interface && major_gte_15 && is_annotation)) { 4705 ResourceMark rm(THREAD); 4706 Exceptions::fthrow( 4707 THREAD_AND_LOCATION, 4708 vmSymbols::java_lang_ClassFormatError(), 4709 "Illegal class modifiers in class %s: 0x%X", 4710 _class_name->as_C_string(), flags 4711 ); 4712 return; 4713 } 4714 } 4715 4716 bool ClassFileParser::has_illegal_visibility(jint flags) { 4717 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4718 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4719 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4720 4721 return ((is_public && is_protected) || 4722 (is_public && is_private) || 4723 (is_protected && is_private)); 4724 } 4725 4726 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4727 u2 max_version = JAVA_MAX_SUPPORTED_VERSION; 4728 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4729 (major <= max_version) && 4730 ((major != max_version) || 4731 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4732 } 4733 4734 void ClassFileParser::verify_legal_field_modifiers( 4735 jint flags, bool is_interface, TRAPS) { 4736 if (!_need_verify) { return; } 4737 4738 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4739 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4740 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4741 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4742 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4743 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4744 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4745 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4746 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4747 4748 bool is_illegal = false; 4749 4750 if (is_interface) { 4751 if (!is_public || !is_static || !is_final || is_private || 4752 is_protected || is_volatile || is_transient || 4753 (major_gte_15 && is_enum)) { 4754 is_illegal = true; 4755 } 4756 } else { // not interface 4757 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4758 is_illegal = true; 4759 } 4760 } 4761 4762 if (is_illegal) { 4763 ResourceMark rm(THREAD); 4764 Exceptions::fthrow( 4765 THREAD_AND_LOCATION, 4766 vmSymbols::java_lang_ClassFormatError(), 4767 "Illegal field modifiers in class %s: 0x%X", 4768 _class_name->as_C_string(), flags); 4769 return; 4770 } 4771 } 4772 4773 void ClassFileParser::verify_legal_method_modifiers( 4774 jint flags, bool is_interface, Symbol* name, TRAPS) { 4775 if (!_need_verify) { return; } 4776 4777 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4778 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4779 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4780 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4781 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4782 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4783 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4784 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4785 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4786 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4787 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4788 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4789 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4790 4791 bool is_illegal = false; 4792 4793 if (is_interface) { 4794 if (major_gte_8) { 4795 // Class file version is JAVA_8_VERSION or later Methods of 4796 // interfaces may set any of the flags except ACC_PROTECTED, 4797 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4798 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4799 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4800 (is_native || is_protected || is_final || is_synchronized) || 4801 // If a specific method of a class or interface has its 4802 // ACC_ABSTRACT flag set, it must not have any of its 4803 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4804 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4805 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4806 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4807 (is_abstract && (is_private || is_static || is_strict))) { 4808 is_illegal = true; 4809 } 4810 } else if (major_gte_15) { 4811 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4812 if (!is_public || is_static || is_final || is_synchronized || 4813 is_native || !is_abstract || is_strict) { 4814 is_illegal = true; 4815 } 4816 } else { 4817 // Class file version is pre-JAVA_1_5_VERSION 4818 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4819 is_illegal = true; 4820 } 4821 } 4822 } else { // not interface 4823 if (is_initializer) { 4824 if (is_static || is_final || is_synchronized || is_native || 4825 is_abstract || (major_gte_15 && is_bridge)) { 4826 is_illegal = true; 4827 } 4828 } else { // not initializer 4829 if (is_abstract) { 4830 if ((is_final || is_native || is_private || is_static || 4831 (major_gte_15 && (is_synchronized || is_strict)))) { 4832 is_illegal = true; 4833 } 4834 } 4835 if (has_illegal_visibility(flags)) { 4836 is_illegal = true; 4837 } 4838 } 4839 } 4840 4841 if (is_illegal) { 4842 ResourceMark rm(THREAD); 4843 Exceptions::fthrow( 4844 THREAD_AND_LOCATION, 4845 vmSymbols::java_lang_ClassFormatError(), 4846 "Method %s in class %s has illegal modifiers: 0x%X", 4847 name->as_C_string(), _class_name->as_C_string(), flags); 4848 return; 4849 } 4850 } 4851 4852 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4853 assert(_need_verify, "only called when _need_verify is true"); 4854 int i = 0; 4855 int count = length >> 2; 4856 for (int k=0; k<count; k++) { 4857 unsigned char b0 = buffer[i]; 4858 unsigned char b1 = buffer[i+1]; 4859 unsigned char b2 = buffer[i+2]; 4860 unsigned char b3 = buffer[i+3]; 4861 // For an unsigned char v, 4862 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4863 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4864 unsigned char res = b0 | b0 - 1 | 4865 b1 | b1 - 1 | 4866 b2 | b2 - 1 | 4867 b3 | b3 - 1; 4868 if (res >= 128) break; 4869 i += 4; 4870 } 4871 for(; i < length; i++) { 4872 unsigned short c; 4873 // no embedded zeros 4874 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4875 if(buffer[i] < 128) { 4876 continue; 4877 } 4878 if ((i + 5) < length) { // see if it's legal supplementary character 4879 if (UTF8::is_supplementary_character(&buffer[i])) { 4880 c = UTF8::get_supplementary_character(&buffer[i]); 4881 i += 5; 4882 continue; 4883 } 4884 } 4885 switch (buffer[i] >> 4) { 4886 default: break; 4887 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4888 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4889 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4890 c = (buffer[i] & 0x1F) << 6; 4891 i++; 4892 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4893 c += buffer[i] & 0x3F; 4894 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4895 // for classes with major > 47, c must a null or a character in its shortest form 4896 break; 4897 } 4898 } 4899 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4900 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4901 c = (buffer[i] & 0xF) << 12; 4902 i += 2; 4903 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4904 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4905 if (_major_version <= 47 || c >= 0x800) { 4906 // for classes with major > 47, c must be in its shortest form 4907 break; 4908 } 4909 } 4910 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4911 } // end of switch 4912 } // end of for 4913 } 4914 4915 // Checks if name is a legal class name. 4916 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4917 if (!_need_verify || _relax_verify) { return; } 4918 4919 char buf[fixed_buffer_size]; 4920 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4921 unsigned int length = name->utf8_length(); 4922 bool legal = false; 4923 4924 if (length > 0) { 4925 char* p; 4926 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4927 p = skip_over_field_signature(bytes, false, length, CHECK); 4928 legal = (p != NULL) && ((p - bytes) == (int)length); 4929 } else if (_major_version < JAVA_1_5_VERSION) { 4930 if (bytes[0] != '<') { 4931 p = skip_over_field_name(bytes, true, length); 4932 legal = (p != NULL) && ((p - bytes) == (int)length); 4933 } 4934 } else { 4935 // 4900761: relax the constraints based on JSR202 spec 4936 // Class names may be drawn from the entire Unicode character set. 4937 // Identifiers between '/' must be unqualified names. 4938 // The utf8 string has been verified when parsing cpool entries. 4939 legal = verify_unqualified_name(bytes, length, LegalClass); 4940 } 4941 } 4942 if (!legal) { 4943 ResourceMark rm(THREAD); 4944 Exceptions::fthrow( 4945 THREAD_AND_LOCATION, 4946 vmSymbols::java_lang_ClassFormatError(), 4947 "Illegal class name \"%s\" in class file %s", bytes, 4948 _class_name->as_C_string() 4949 ); 4950 return; 4951 } 4952 } 4953 4954 // Checks if name is a legal field name. 4955 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 4956 if (!_need_verify || _relax_verify) { return; } 4957 4958 char buf[fixed_buffer_size]; 4959 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4960 unsigned int length = name->utf8_length(); 4961 bool legal = false; 4962 4963 if (length > 0) { 4964 if (_major_version < JAVA_1_5_VERSION) { 4965 if (bytes[0] != '<') { 4966 char* p = skip_over_field_name(bytes, false, length); 4967 legal = (p != NULL) && ((p - bytes) == (int)length); 4968 } 4969 } else { 4970 // 4881221: relax the constraints based on JSR202 spec 4971 legal = verify_unqualified_name(bytes, length, LegalField); 4972 } 4973 } 4974 4975 if (!legal) { 4976 ResourceMark rm(THREAD); 4977 Exceptions::fthrow( 4978 THREAD_AND_LOCATION, 4979 vmSymbols::java_lang_ClassFormatError(), 4980 "Illegal field name \"%s\" in class %s", bytes, 4981 _class_name->as_C_string() 4982 ); 4983 return; 4984 } 4985 } 4986 4987 // Checks if name is a legal method name. 4988 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 4989 if (!_need_verify || _relax_verify) { return; } 4990 4991 assert(name != NULL, "method name is null"); 4992 char buf[fixed_buffer_size]; 4993 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4994 unsigned int length = name->utf8_length(); 4995 bool legal = false; 4996 4997 if (length > 0) { 4998 if (bytes[0] == '<') { 4999 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 5000 legal = true; 5001 } 5002 } else if (_major_version < JAVA_1_5_VERSION) { 5003 char* p; 5004 p = skip_over_field_name(bytes, false, length); 5005 legal = (p != NULL) && ((p - bytes) == (int)length); 5006 } else { 5007 // 4881221: relax the constraints based on JSR202 spec 5008 legal = verify_unqualified_name(bytes, length, LegalMethod); 5009 } 5010 } 5011 5012 if (!legal) { 5013 ResourceMark rm(THREAD); 5014 Exceptions::fthrow( 5015 THREAD_AND_LOCATION, 5016 vmSymbols::java_lang_ClassFormatError(), 5017 "Illegal method name \"%s\" in class %s", bytes, 5018 _class_name->as_C_string() 5019 ); 5020 return; 5021 } 5022 } 5023 5024 5025 // Checks if signature is a legal field signature. 5026 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 5027 if (!_need_verify) { return; } 5028 5029 char buf[fixed_buffer_size]; 5030 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5031 unsigned int length = signature->utf8_length(); 5032 char* p = skip_over_field_signature(bytes, false, length, CHECK); 5033 5034 if (p == NULL || (p - bytes) != (int)length) { 5035 throwIllegalSignature("Field", name, signature, CHECK); 5036 } 5037 } 5038 5039 // Checks if signature is a legal method signature. 5040 // Returns number of parameters 5041 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 5042 if (!_need_verify) { 5043 // make sure caller's args_size will be less than 0 even for non-static 5044 // method so it will be recomputed in compute_size_of_parameters(). 5045 return -2; 5046 } 5047 5048 unsigned int args_size = 0; 5049 char buf[fixed_buffer_size]; 5050 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 5051 unsigned int length = signature->utf8_length(); 5052 char* nextp; 5053 5054 // The first character must be a '(' 5055 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 5056 length--; 5057 // Skip over legal field signatures 5058 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5059 while ((length > 0) && (nextp != NULL)) { 5060 args_size++; 5061 if (p[0] == 'J' || p[0] == 'D') { 5062 args_size++; 5063 } 5064 length -= nextp - p; 5065 p = nextp; 5066 nextp = skip_over_field_signature(p, false, length, CHECK_0); 5067 } 5068 // The first non-signature thing better be a ')' 5069 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 5070 length--; 5071 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 5072 // All internal methods must return void 5073 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 5074 return args_size; 5075 } 5076 } else { 5077 // Now we better just have a return value 5078 nextp = skip_over_field_signature(p, true, length, CHECK_0); 5079 if (nextp && ((int)length == (nextp - p))) { 5080 return args_size; 5081 } 5082 } 5083 } 5084 } 5085 // Report error 5086 throwIllegalSignature("Method", name, signature, CHECK_0); 5087 return 0; 5088 } 5089 5090 5091 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 5092 // Method names also may not contain the characters '<' or '>', unless <init> 5093 // or <clinit>. Note that method names may not be <init> or <clinit> in this 5094 // method. Because these names have been checked as special cases before 5095 // calling this method in verify_legal_method_name. 5096 bool ClassFileParser::verify_unqualified_name( 5097 char* name, unsigned int length, int type) { 5098 jchar ch; 5099 5100 for (char* p = name; p != name + length; ) { 5101 ch = *p; 5102 if (ch < 128) { 5103 p++; 5104 if (ch == '.' || ch == ';' || ch == '[' ) { 5105 return false; // do not permit '.', ';', or '[' 5106 } 5107 if (type != LegalClass && ch == '/') { 5108 return false; // do not permit '/' unless it's class name 5109 } 5110 if (type == LegalMethod && (ch == '<' || ch == '>')) { 5111 return false; // do not permit '<' or '>' in method names 5112 } 5113 } else { 5114 char* tmp_p = UTF8::next(p, &ch); 5115 p = tmp_p; 5116 } 5117 } 5118 return true; 5119 } 5120 5121 5122 // Take pointer to a string. Skip over the longest part of the string that could 5123 // be taken as a fieldname. Allow '/' if slash_ok is true. 5124 // Return a pointer to just past the fieldname. 5125 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5126 // being true, we saw consecutive slashes (meaning we were looking for a 5127 // qualified path but found something that was badly-formed). 5128 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5129 char* p; 5130 jchar ch; 5131 jboolean last_is_slash = false; 5132 jboolean not_first_ch = false; 5133 5134 for (p = name; p != name + length; not_first_ch = true) { 5135 char* old_p = p; 5136 ch = *p; 5137 if (ch < 128) { 5138 p++; 5139 // quick check for ascii 5140 if ((ch >= 'a' && ch <= 'z') || 5141 (ch >= 'A' && ch <= 'Z') || 5142 (ch == '_' || ch == '$') || 5143 (not_first_ch && ch >= '0' && ch <= '9')) { 5144 last_is_slash = false; 5145 continue; 5146 } 5147 if (slash_ok && ch == '/') { 5148 if (last_is_slash) { 5149 return NULL; // Don't permit consecutive slashes 5150 } 5151 last_is_slash = true; 5152 continue; 5153 } 5154 } else { 5155 jint unicode_ch; 5156 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5157 p = tmp_p; 5158 last_is_slash = false; 5159 // Check if ch is Java identifier start or is Java identifier part 5160 // 4672820: call java.lang.Character methods directly without generating separate tables. 5161 EXCEPTION_MARK; 5162 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5163 5164 // return value 5165 JavaValue result(T_BOOLEAN); 5166 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5167 JavaCallArguments args; 5168 args.push_int(unicode_ch); 5169 5170 // public static boolean isJavaIdentifierStart(char ch); 5171 JavaCalls::call_static(&result, 5172 klass, 5173 vmSymbols::isJavaIdentifierStart_name(), 5174 vmSymbols::int_bool_signature(), 5175 &args, 5176 THREAD); 5177 5178 if (HAS_PENDING_EXCEPTION) { 5179 CLEAR_PENDING_EXCEPTION; 5180 return 0; 5181 } 5182 if (result.get_jboolean()) { 5183 continue; 5184 } 5185 5186 if (not_first_ch) { 5187 // public static boolean isJavaIdentifierPart(char ch); 5188 JavaCalls::call_static(&result, 5189 klass, 5190 vmSymbols::isJavaIdentifierPart_name(), 5191 vmSymbols::int_bool_signature(), 5192 &args, 5193 THREAD); 5194 5195 if (HAS_PENDING_EXCEPTION) { 5196 CLEAR_PENDING_EXCEPTION; 5197 return 0; 5198 } 5199 5200 if (result.get_jboolean()) { 5201 continue; 5202 } 5203 } 5204 } 5205 return (not_first_ch) ? old_p : NULL; 5206 } 5207 return (not_first_ch) ? p : NULL; 5208 } 5209 5210 5211 // Take pointer to a string. Skip over the longest part of the string that could 5212 // be taken as a field signature. Allow "void" if void_ok. 5213 // Return a pointer to just past the signature. 5214 // Return NULL if no legal signature is found. 5215 char* ClassFileParser::skip_over_field_signature(char* signature, 5216 bool void_ok, 5217 unsigned int length, 5218 TRAPS) { 5219 unsigned int array_dim = 0; 5220 while (length > 0) { 5221 switch (signature[0]) { 5222 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5223 case JVM_SIGNATURE_BOOLEAN: 5224 case JVM_SIGNATURE_BYTE: 5225 case JVM_SIGNATURE_CHAR: 5226 case JVM_SIGNATURE_SHORT: 5227 case JVM_SIGNATURE_INT: 5228 case JVM_SIGNATURE_FLOAT: 5229 case JVM_SIGNATURE_LONG: 5230 case JVM_SIGNATURE_DOUBLE: 5231 return signature + 1; 5232 case JVM_SIGNATURE_CLASS: { 5233 if (_major_version < JAVA_1_5_VERSION) { 5234 // Skip over the class name if one is there 5235 char* p = skip_over_field_name(signature + 1, true, --length); 5236 5237 // The next character better be a semicolon 5238 if (p && (p - signature) > 1 && p[0] == ';') { 5239 return p + 1; 5240 } 5241 } else { 5242 // 4900761: For class version > 48, any unicode is allowed in class name. 5243 length--; 5244 signature++; 5245 while (length > 0 && signature[0] != ';') { 5246 if (signature[0] == '.') { 5247 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5248 } 5249 length--; 5250 signature++; 5251 } 5252 if (signature[0] == ';') { return signature + 1; } 5253 } 5254 5255 return NULL; 5256 } 5257 case JVM_SIGNATURE_ARRAY: 5258 array_dim++; 5259 if (array_dim > 255) { 5260 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5261 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5262 } 5263 // The rest of what's there better be a legal signature 5264 signature++; 5265 length--; 5266 void_ok = false; 5267 break; 5268 5269 default: 5270 return NULL; 5271 } 5272 } 5273 return NULL; 5274 }