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