1 /* 2 * Copyright (c) 1997, 2013, 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/genericSignatures.hpp" 32 #include "classfile/javaClasses.hpp" 33 #include "classfile/symbolTable.hpp" 34 #include "classfile/systemDictionary.hpp" 35 #include "classfile/verificationType.hpp" 36 #include "classfile/verifier.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "memory/allocation.hpp" 39 #include "memory/gcLocker.hpp" 40 #include "memory/metadataFactory.hpp" 41 #include "memory/oopFactory.hpp" 42 #include "memory/referenceType.hpp" 43 #include "memory/universe.inline.hpp" 44 #include "oops/constantPool.hpp" 45 #include "oops/fieldStreams.hpp" 46 #include "oops/instanceKlass.hpp" 47 #include "oops/instanceMirrorKlass.hpp" 48 #include "oops/klass.inline.hpp" 49 #include "oops/klassVtable.hpp" 50 #include "oops/method.hpp" 51 #include "oops/symbol.hpp" 52 #include "prims/jvm.h" 53 #include "prims/jvmtiExport.hpp" 54 #include "prims/jvmtiThreadState.hpp" 55 #include "runtime/javaCalls.hpp" 56 #include "runtime/perfData.hpp" 57 #include "runtime/reflection.hpp" 58 #include "runtime/signature.hpp" 59 #include "runtime/timer.hpp" 60 #include "services/classLoadingService.hpp" 61 #include "services/threadService.hpp" 62 #include "utilities/array.hpp" 63 #include "utilities/globalDefinitions.hpp" 64 65 // We generally try to create the oops directly when parsing, rather than 66 // allocating temporary data structures and copying the bytes twice. A 67 // temporary area is only needed when parsing utf8 entries in the constant 68 // pool and when parsing line number tables. 69 70 // We add assert in debug mode when class format is not checked. 71 72 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE 73 #define JAVA_MIN_SUPPORTED_VERSION 45 74 #define JAVA_MAX_SUPPORTED_VERSION 52 75 #define JAVA_MAX_SUPPORTED_MINOR_VERSION 0 76 77 // Used for two backward compatibility reasons: 78 // - to check for new additions to the class file format in JDK1.5 79 // - to check for bug fixes in the format checker in JDK1.5 80 #define JAVA_1_5_VERSION 49 81 82 // Used for backward compatibility reasons: 83 // - to check for javac bug fixes that happened after 1.5 84 // - also used as the max version when running in jdk6 85 #define JAVA_6_VERSION 50 86 87 // Used for backward compatibility reasons: 88 // - to check NameAndType_info signatures more aggressively 89 #define JAVA_7_VERSION 51 90 91 // Extension method support. 92 #define JAVA_8_VERSION 52 93 94 void ClassFileParser::parse_constant_pool_entries(int length, TRAPS) { 95 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize 96 // this function (_current can be allocated in a register, with scalar 97 // replacement of aggregates). The _current pointer is copied back to 98 // stream() when this function returns. DON'T call another method within 99 // this method that uses stream(). 100 ClassFileStream* cfs0 = stream(); 101 ClassFileStream cfs1 = *cfs0; 102 ClassFileStream* cfs = &cfs1; 103 #ifdef ASSERT 104 assert(cfs->allocated_on_stack(),"should be local"); 105 u1* old_current = cfs0->current(); 106 #endif 107 Handle class_loader(THREAD, _loader_data->class_loader()); 108 109 // Used for batching symbol allocations. 110 const char* names[SymbolTable::symbol_alloc_batch_size]; 111 int lengths[SymbolTable::symbol_alloc_batch_size]; 112 int indices[SymbolTable::symbol_alloc_batch_size]; 113 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; 114 int names_count = 0; 115 116 // parsing Index 0 is unused 117 for (int index = 1; index < length; index++) { 118 // Each of the following case guarantees one more byte in the stream 119 // for the following tag or the access_flags following constant pool, 120 // so we don't need bounds-check for reading tag. 121 u1 tag = cfs->get_u1_fast(); 122 switch (tag) { 123 case JVM_CONSTANT_Class : 124 { 125 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags 126 u2 name_index = cfs->get_u2_fast(); 127 _cp->klass_index_at_put(index, name_index); 128 } 129 break; 130 case JVM_CONSTANT_Fieldref : 131 { 132 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 133 u2 class_index = cfs->get_u2_fast(); 134 u2 name_and_type_index = cfs->get_u2_fast(); 135 _cp->field_at_put(index, class_index, name_and_type_index); 136 } 137 break; 138 case JVM_CONSTANT_Methodref : 139 { 140 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 141 u2 class_index = cfs->get_u2_fast(); 142 u2 name_and_type_index = cfs->get_u2_fast(); 143 _cp->method_at_put(index, class_index, name_and_type_index); 144 } 145 break; 146 case JVM_CONSTANT_InterfaceMethodref : 147 { 148 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags 149 u2 class_index = cfs->get_u2_fast(); 150 u2 name_and_type_index = cfs->get_u2_fast(); 151 _cp->interface_method_at_put(index, class_index, name_and_type_index); 152 } 153 break; 154 case JVM_CONSTANT_String : 155 { 156 cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags 157 u2 string_index = cfs->get_u2_fast(); 158 _cp->string_index_at_put(index, string_index); 159 } 160 break; 161 case JVM_CONSTANT_MethodHandle : 162 case JVM_CONSTANT_MethodType : 163 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 164 classfile_parse_error( 165 "Class file version does not support constant tag %u in class file %s", 166 tag, CHECK); 167 } 168 if (!EnableInvokeDynamic) { 169 classfile_parse_error( 170 "This JVM does not support constant tag %u in class file %s", 171 tag, CHECK); 172 } 173 if (tag == JVM_CONSTANT_MethodHandle) { 174 cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags 175 u1 ref_kind = cfs->get_u1_fast(); 176 u2 method_index = cfs->get_u2_fast(); 177 _cp->method_handle_index_at_put(index, ref_kind, method_index); 178 } else if (tag == JVM_CONSTANT_MethodType) { 179 cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags 180 u2 signature_index = cfs->get_u2_fast(); 181 _cp->method_type_index_at_put(index, signature_index); 182 } else { 183 ShouldNotReachHere(); 184 } 185 break; 186 case JVM_CONSTANT_InvokeDynamic : 187 { 188 if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 189 classfile_parse_error( 190 "Class file version does not support constant tag %u in class file %s", 191 tag, CHECK); 192 } 193 if (!EnableInvokeDynamic) { 194 classfile_parse_error( 195 "This JVM does not support constant tag %u in class file %s", 196 tag, CHECK); 197 } 198 cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags 199 u2 bootstrap_specifier_index = cfs->get_u2_fast(); 200 u2 name_and_type_index = cfs->get_u2_fast(); 201 if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) 202 _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later 203 _cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); 204 } 205 break; 206 case JVM_CONSTANT_Integer : 207 { 208 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 209 u4 bytes = cfs->get_u4_fast(); 210 _cp->int_at_put(index, (jint) bytes); 211 } 212 break; 213 case JVM_CONSTANT_Float : 214 { 215 cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags 216 u4 bytes = cfs->get_u4_fast(); 217 _cp->float_at_put(index, *(jfloat*)&bytes); 218 } 219 break; 220 case JVM_CONSTANT_Long : 221 // A mangled type might cause you to overrun allocated memory 222 guarantee_property(index+1 < length, 223 "Invalid constant pool entry %u in class file %s", 224 index, CHECK); 225 { 226 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 227 u8 bytes = cfs->get_u8_fast(); 228 _cp->long_at_put(index, bytes); 229 } 230 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 231 break; 232 case JVM_CONSTANT_Double : 233 // A mangled type might cause you to overrun allocated memory 234 guarantee_property(index+1 < length, 235 "Invalid constant pool entry %u in class file %s", 236 index, CHECK); 237 { 238 cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags 239 u8 bytes = cfs->get_u8_fast(); 240 _cp->double_at_put(index, *(jdouble*)&bytes); 241 } 242 index++; // Skip entry following eigth-byte constant, see JVM book p. 98 243 break; 244 case JVM_CONSTANT_NameAndType : 245 { 246 cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags 247 u2 name_index = cfs->get_u2_fast(); 248 u2 signature_index = cfs->get_u2_fast(); 249 _cp->name_and_type_at_put(index, name_index, signature_index); 250 } 251 break; 252 case JVM_CONSTANT_Utf8 : 253 { 254 cfs->guarantee_more(2, CHECK); // utf8_length 255 u2 utf8_length = cfs->get_u2_fast(); 256 u1* utf8_buffer = cfs->get_u1_buffer(); 257 assert(utf8_buffer != NULL, "null utf8 buffer"); 258 // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. 259 cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags 260 cfs->skip_u1_fast(utf8_length); 261 262 // Before storing the symbol, make sure it's legal 263 if (_need_verify) { 264 verify_legal_utf8((unsigned char*)utf8_buffer, utf8_length, CHECK); 265 } 266 267 if (EnableInvokeDynamic && has_cp_patch_at(index)) { 268 Handle patch = clear_cp_patch_at(index); 269 guarantee_property(java_lang_String::is_instance(patch()), 270 "Illegal utf8 patch at %d in class file %s", 271 index, CHECK); 272 char* str = java_lang_String::as_utf8_string(patch()); 273 // (could use java_lang_String::as_symbol instead, but might as well batch them) 274 utf8_buffer = (u1*) str; 275 utf8_length = (int) strlen(str); 276 } 277 278 unsigned int hash; 279 Symbol* result = SymbolTable::lookup_only((char*)utf8_buffer, utf8_length, hash); 280 if (result == NULL) { 281 names[names_count] = (char*)utf8_buffer; 282 lengths[names_count] = utf8_length; 283 indices[names_count] = index; 284 hashValues[names_count++] = hash; 285 if (names_count == SymbolTable::symbol_alloc_batch_size) { 286 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 287 names_count = 0; 288 } 289 } else { 290 _cp->symbol_at_put(index, result); 291 } 292 } 293 break; 294 default: 295 classfile_parse_error( 296 "Unknown constant tag %u in class file %s", tag, CHECK); 297 break; 298 } 299 } 300 301 // Allocate the remaining symbols 302 if (names_count > 0) { 303 SymbolTable::new_symbols(_loader_data, _cp, names_count, names, lengths, indices, hashValues, CHECK); 304 } 305 306 // Copy _current pointer of local copy back to stream(). 307 #ifdef ASSERT 308 assert(cfs0->current() == old_current, "non-exclusive use of stream()"); 309 #endif 310 cfs0->set_current(cfs1.current()); 311 } 312 313 bool inline valid_cp_range(int index, int length) { return (index > 0 && index < length); } 314 315 inline Symbol* check_symbol_at(constantPoolHandle cp, int index) { 316 if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) 317 return cp->symbol_at(index); 318 else 319 return NULL; 320 } 321 322 constantPoolHandle ClassFileParser::parse_constant_pool(TRAPS) { 323 ClassFileStream* cfs = stream(); 324 constantPoolHandle nullHandle; 325 326 cfs->guarantee_more(3, CHECK_(nullHandle)); // length, first cp tag 327 u2 length = cfs->get_u2_fast(); 328 guarantee_property( 329 length >= 1, "Illegal constant pool size %u in class file %s", 330 length, CHECK_(nullHandle)); 331 ConstantPool* constant_pool = ConstantPool::allocate(_loader_data, length, 332 CHECK_(nullHandle)); 333 _cp = constant_pool; // save in case of errors 334 constantPoolHandle cp (THREAD, constant_pool); 335 336 // parsing constant pool entries 337 parse_constant_pool_entries(length, CHECK_(nullHandle)); 338 339 int index = 1; // declared outside of loops for portability 340 341 // first verification pass - validate cross references and fixup class and string constants 342 for (index = 1; index < length; index++) { // Index 0 is unused 343 jbyte tag = cp->tag_at(index).value(); 344 switch (tag) { 345 case JVM_CONSTANT_Class : 346 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 347 break; 348 case JVM_CONSTANT_Fieldref : 349 // fall through 350 case JVM_CONSTANT_Methodref : 351 // fall through 352 case JVM_CONSTANT_InterfaceMethodref : { 353 if (!_need_verify) break; 354 int klass_ref_index = cp->klass_ref_index_at(index); 355 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 356 check_property(valid_klass_reference_at(klass_ref_index), 357 "Invalid constant pool index %u in class file %s", 358 klass_ref_index, 359 CHECK_(nullHandle)); 360 check_property(valid_cp_range(name_and_type_ref_index, length) && 361 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 362 "Invalid constant pool index %u in class file %s", 363 name_and_type_ref_index, 364 CHECK_(nullHandle)); 365 break; 366 } 367 case JVM_CONSTANT_String : 368 ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present 369 break; 370 case JVM_CONSTANT_Integer : 371 break; 372 case JVM_CONSTANT_Float : 373 break; 374 case JVM_CONSTANT_Long : 375 case JVM_CONSTANT_Double : 376 index++; 377 check_property( 378 (index < length && cp->tag_at(index).is_invalid()), 379 "Improper constant pool long/double index %u in class file %s", 380 index, CHECK_(nullHandle)); 381 break; 382 case JVM_CONSTANT_NameAndType : { 383 if (!_need_verify) break; 384 int name_ref_index = cp->name_ref_index_at(index); 385 int signature_ref_index = cp->signature_ref_index_at(index); 386 check_property(valid_symbol_at(name_ref_index), 387 "Invalid constant pool index %u in class file %s", 388 name_ref_index, CHECK_(nullHandle)); 389 check_property(valid_symbol_at(signature_ref_index), 390 "Invalid constant pool index %u in class file %s", 391 signature_ref_index, CHECK_(nullHandle)); 392 break; 393 } 394 case JVM_CONSTANT_Utf8 : 395 break; 396 case JVM_CONSTANT_UnresolvedClass : // fall-through 397 case JVM_CONSTANT_UnresolvedClassInError: 398 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present 399 break; 400 case JVM_CONSTANT_ClassIndex : 401 { 402 int class_index = cp->klass_index_at(index); 403 check_property(valid_symbol_at(class_index), 404 "Invalid constant pool index %u in class file %s", 405 class_index, CHECK_(nullHandle)); 406 cp->unresolved_klass_at_put(index, cp->symbol_at(class_index)); 407 } 408 break; 409 case JVM_CONSTANT_StringIndex : 410 { 411 int string_index = cp->string_index_at(index); 412 check_property(valid_symbol_at(string_index), 413 "Invalid constant pool index %u in class file %s", 414 string_index, CHECK_(nullHandle)); 415 Symbol* sym = cp->symbol_at(string_index); 416 cp->unresolved_string_at_put(index, sym); 417 } 418 break; 419 case JVM_CONSTANT_MethodHandle : 420 { 421 int ref_index = cp->method_handle_index_at(index); 422 check_property( 423 valid_cp_range(ref_index, length) && 424 EnableInvokeDynamic, 425 "Invalid constant pool index %u in class file %s", 426 ref_index, CHECK_(nullHandle)); 427 constantTag tag = cp->tag_at(ref_index); 428 int ref_kind = cp->method_handle_ref_kind_at(index); 429 switch (ref_kind) { 430 case JVM_REF_getField: 431 case JVM_REF_getStatic: 432 case JVM_REF_putField: 433 case JVM_REF_putStatic: 434 check_property( 435 tag.is_field(), 436 "Invalid constant pool index %u in class file %s (not a field)", 437 ref_index, CHECK_(nullHandle)); 438 break; 439 case JVM_REF_invokeVirtual: 440 case JVM_REF_newInvokeSpecial: 441 check_property( 442 tag.is_method(), 443 "Invalid constant pool index %u in class file %s (not a method)", 444 ref_index, CHECK_(nullHandle)); 445 break; 446 case JVM_REF_invokeStatic: 447 case JVM_REF_invokeSpecial: 448 check_property(tag.is_method() || 449 ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), 450 "Invalid constant pool index %u in class file %s (not a method)", 451 ref_index, CHECK_(nullHandle)); 452 break; 453 case JVM_REF_invokeInterface: 454 check_property( 455 tag.is_interface_method(), 456 "Invalid constant pool index %u in class file %s (not an interface method)", 457 ref_index, CHECK_(nullHandle)); 458 break; 459 default: 460 classfile_parse_error( 461 "Bad method handle kind at constant pool index %u in class file %s", 462 index, CHECK_(nullHandle)); 463 } 464 // Keep the ref_index unchanged. It will be indirected at link-time. 465 } 466 break; 467 case JVM_CONSTANT_MethodType : 468 { 469 int ref_index = cp->method_type_index_at(index); 470 check_property(valid_symbol_at(ref_index) && EnableInvokeDynamic, 471 "Invalid constant pool index %u in class file %s", 472 ref_index, CHECK_(nullHandle)); 473 } 474 break; 475 case JVM_CONSTANT_InvokeDynamic : 476 { 477 int name_and_type_ref_index = cp->invoke_dynamic_name_and_type_ref_index_at(index); 478 check_property(valid_cp_range(name_and_type_ref_index, length) && 479 cp->tag_at(name_and_type_ref_index).is_name_and_type(), 480 "Invalid constant pool index %u in class file %s", 481 name_and_type_ref_index, 482 CHECK_(nullHandle)); 483 // bootstrap specifier index must be checked later, when BootstrapMethods attr is available 484 break; 485 } 486 default: 487 fatal(err_msg("bad constant pool tag value %u", 488 cp->tag_at(index).value())); 489 ShouldNotReachHere(); 490 break; 491 } // end of switch 492 } // end of for 493 494 if (_cp_patches != NULL) { 495 // need to treat this_class specially... 496 assert(EnableInvokeDynamic, ""); 497 int this_class_index; 498 { 499 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 500 u1* mark = cfs->current(); 501 u2 flags = cfs->get_u2_fast(); 502 this_class_index = cfs->get_u2_fast(); 503 cfs->set_current(mark); // revert to mark 504 } 505 506 for (index = 1; index < length; index++) { // Index 0 is unused 507 if (has_cp_patch_at(index)) { 508 guarantee_property(index != this_class_index, 509 "Illegal constant pool patch to self at %d in class file %s", 510 index, CHECK_(nullHandle)); 511 patch_constant_pool(cp, index, cp_patch_at(index), CHECK_(nullHandle)); 512 } 513 } 514 } 515 516 if (!_need_verify) { 517 return cp; 518 } 519 520 // second verification pass - checks the strings are of the right format. 521 // but not yet to the other entries 522 for (index = 1; index < length; index++) { 523 jbyte tag = cp->tag_at(index).value(); 524 switch (tag) { 525 case JVM_CONSTANT_UnresolvedClass: { 526 Symbol* class_name = cp->unresolved_klass_at(index); 527 // check the name, even if _cp_patches will overwrite it 528 verify_legal_class_name(class_name, CHECK_(nullHandle)); 529 break; 530 } 531 case JVM_CONSTANT_NameAndType: { 532 if (_need_verify && _major_version >= JAVA_7_VERSION) { 533 int sig_index = cp->signature_ref_index_at(index); 534 int name_index = cp->name_ref_index_at(index); 535 Symbol* name = cp->symbol_at(name_index); 536 Symbol* sig = cp->symbol_at(sig_index); 537 if (sig->byte_at(0) == JVM_SIGNATURE_FUNC) { 538 verify_legal_method_signature(name, sig, CHECK_(nullHandle)); 539 } else { 540 verify_legal_field_signature(name, sig, CHECK_(nullHandle)); 541 } 542 } 543 break; 544 } 545 case JVM_CONSTANT_InvokeDynamic: 546 case JVM_CONSTANT_Fieldref: 547 case JVM_CONSTANT_Methodref: 548 case JVM_CONSTANT_InterfaceMethodref: { 549 int name_and_type_ref_index = cp->name_and_type_ref_index_at(index); 550 // already verified to be utf8 551 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 552 // already verified to be utf8 553 int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); 554 Symbol* name = cp->symbol_at(name_ref_index); 555 Symbol* signature = cp->symbol_at(signature_ref_index); 556 if (tag == JVM_CONSTANT_Fieldref) { 557 verify_legal_field_name(name, CHECK_(nullHandle)); 558 if (_need_verify && _major_version >= JAVA_7_VERSION) { 559 // Signature is verified above, when iterating NameAndType_info. 560 // Need only to be sure it's the right type. 561 if (signature->byte_at(0) == JVM_SIGNATURE_FUNC) { 562 throwIllegalSignature( 563 "Field", name, signature, CHECK_(nullHandle)); 564 } 565 } else { 566 verify_legal_field_signature(name, signature, CHECK_(nullHandle)); 567 } 568 } else { 569 verify_legal_method_name(name, CHECK_(nullHandle)); 570 if (_need_verify && _major_version >= JAVA_7_VERSION) { 571 // Signature is verified above, when iterating NameAndType_info. 572 // Need only to be sure it's the right type. 573 if (signature->byte_at(0) != JVM_SIGNATURE_FUNC) { 574 throwIllegalSignature( 575 "Method", name, signature, CHECK_(nullHandle)); 576 } 577 } else { 578 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 579 } 580 if (tag == JVM_CONSTANT_Methodref) { 581 // 4509014: If a class method name begins with '<', it must be "<init>". 582 assert(name != NULL, "method name in constant pool is null"); 583 unsigned int name_len = name->utf8_length(); 584 assert(name_len > 0, "bad method name"); // already verified as legal name 585 if (name->byte_at(0) == '<') { 586 if (name != vmSymbols::object_initializer_name()) { 587 classfile_parse_error( 588 "Bad method name at constant pool index %u in class file %s", 589 name_ref_index, CHECK_(nullHandle)); 590 } 591 } 592 } 593 } 594 break; 595 } 596 case JVM_CONSTANT_MethodHandle: { 597 int ref_index = cp->method_handle_index_at(index); 598 int ref_kind = cp->method_handle_ref_kind_at(index); 599 switch (ref_kind) { 600 case JVM_REF_invokeVirtual: 601 case JVM_REF_invokeStatic: 602 case JVM_REF_invokeSpecial: 603 case JVM_REF_newInvokeSpecial: 604 { 605 int name_and_type_ref_index = cp->name_and_type_ref_index_at(ref_index); 606 int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); 607 Symbol* name = cp->symbol_at(name_ref_index); 608 if (ref_kind == JVM_REF_newInvokeSpecial) { 609 if (name != vmSymbols::object_initializer_name()) { 610 classfile_parse_error( 611 "Bad constructor name at constant pool index %u in class file %s", 612 name_ref_index, CHECK_(nullHandle)); 613 } 614 } else { 615 if (name == vmSymbols::object_initializer_name()) { 616 classfile_parse_error( 617 "Bad method name at constant pool index %u in class file %s", 618 name_ref_index, CHECK_(nullHandle)); 619 } 620 } 621 } 622 break; 623 // Other ref_kinds are already fully checked in previous pass. 624 } 625 break; 626 } 627 case JVM_CONSTANT_MethodType: { 628 Symbol* no_name = vmSymbols::type_name(); // place holder 629 Symbol* signature = cp->method_type_signature_at(index); 630 verify_legal_method_signature(no_name, signature, CHECK_(nullHandle)); 631 break; 632 } 633 case JVM_CONSTANT_Utf8: { 634 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); 635 } 636 } // end of switch 637 } // end of for 638 639 return cp; 640 } 641 642 643 void ClassFileParser::patch_constant_pool(constantPoolHandle cp, int index, Handle patch, TRAPS) { 644 assert(EnableInvokeDynamic, ""); 645 BasicType patch_type = T_VOID; 646 647 switch (cp->tag_at(index).value()) { 648 649 case JVM_CONSTANT_UnresolvedClass : 650 // Patching a class means pre-resolving it. 651 // The name in the constant pool is ignored. 652 if (java_lang_Class::is_instance(patch())) { 653 guarantee_property(!java_lang_Class::is_primitive(patch()), 654 "Illegal class patch at %d in class file %s", 655 index, CHECK); 656 cp->klass_at_put(index, java_lang_Class::as_Klass(patch())); 657 } else { 658 guarantee_property(java_lang_String::is_instance(patch()), 659 "Illegal class patch at %d in class file %s", 660 index, CHECK); 661 Symbol* name = java_lang_String::as_symbol(patch(), CHECK); 662 cp->unresolved_klass_at_put(index, name); 663 } 664 break; 665 666 case JVM_CONSTANT_String : 667 // skip this patch and don't clear it. Needs the oop array for resolved 668 // references to be created first. 669 return; 670 671 case JVM_CONSTANT_Integer : patch_type = T_INT; goto patch_prim; 672 case JVM_CONSTANT_Float : patch_type = T_FLOAT; goto patch_prim; 673 case JVM_CONSTANT_Long : patch_type = T_LONG; goto patch_prim; 674 case JVM_CONSTANT_Double : patch_type = T_DOUBLE; goto patch_prim; 675 patch_prim: 676 { 677 jvalue value; 678 BasicType value_type = java_lang_boxing_object::get_value(patch(), &value); 679 guarantee_property(value_type == patch_type, 680 "Illegal primitive patch at %d in class file %s", 681 index, CHECK); 682 switch (value_type) { 683 case T_INT: cp->int_at_put(index, value.i); break; 684 case T_FLOAT: cp->float_at_put(index, value.f); break; 685 case T_LONG: cp->long_at_put(index, value.j); break; 686 case T_DOUBLE: cp->double_at_put(index, value.d); break; 687 default: assert(false, ""); 688 } 689 } 690 break; 691 692 default: 693 // %%% TODO: put method handles into CONSTANT_InterfaceMethodref, etc. 694 guarantee_property(!has_cp_patch_at(index), 695 "Illegal unexpected patch at %d in class file %s", 696 index, CHECK); 697 return; 698 } 699 700 // On fall-through, mark the patch as used. 701 clear_cp_patch_at(index); 702 } 703 704 705 706 class NameSigHash: public ResourceObj { 707 public: 708 Symbol* _name; // name 709 Symbol* _sig; // signature 710 NameSigHash* _next; // Next entry in hash table 711 }; 712 713 714 #define HASH_ROW_SIZE 256 715 716 unsigned int hash(Symbol* name, Symbol* sig) { 717 unsigned int raw_hash = 0; 718 raw_hash += ((unsigned int)(uintptr_t)name) >> (LogHeapWordSize + 2); 719 raw_hash += ((unsigned int)(uintptr_t)sig) >> LogHeapWordSize; 720 721 return (raw_hash + (unsigned int)(uintptr_t)name) % HASH_ROW_SIZE; 722 } 723 724 725 void initialize_hashtable(NameSigHash** table) { 726 memset((void*)table, 0, sizeof(NameSigHash*) * HASH_ROW_SIZE); 727 } 728 729 // Return false if the name/sig combination is found in table. 730 // Return true if no duplicate is found. And name/sig is added as a new entry in table. 731 // The old format checker uses heap sort to find duplicates. 732 // NOTE: caller should guarantee that GC doesn't happen during the life cycle 733 // of table since we don't expect Symbol*'s to move. 734 bool put_after_lookup(Symbol* name, Symbol* sig, NameSigHash** table) { 735 assert(name != NULL, "name in constant pool is NULL"); 736 737 // First lookup for duplicates 738 int index = hash(name, sig); 739 NameSigHash* entry = table[index]; 740 while (entry != NULL) { 741 if (entry->_name == name && entry->_sig == sig) { 742 return false; 743 } 744 entry = entry->_next; 745 } 746 747 // No duplicate is found, allocate a new entry and fill it. 748 entry = new NameSigHash(); 749 entry->_name = name; 750 entry->_sig = sig; 751 752 // Insert into hash table 753 entry->_next = table[index]; 754 table[index] = entry; 755 756 return true; 757 } 758 759 760 Array<Klass*>* ClassFileParser::parse_interfaces(int length, 761 Handle protection_domain, 762 Symbol* class_name, 763 bool* has_default_methods, 764 TRAPS) { 765 if (length == 0) { 766 _local_interfaces = Universe::the_empty_klass_array(); 767 } else { 768 ClassFileStream* cfs = stream(); 769 assert(length > 0, "only called for length>0"); 770 _local_interfaces = MetadataFactory::new_array<Klass*>(_loader_data, length, NULL, CHECK_NULL); 771 772 int index; 773 for (index = 0; index < length; index++) { 774 u2 interface_index = cfs->get_u2(CHECK_NULL); 775 KlassHandle interf; 776 check_property( 777 valid_klass_reference_at(interface_index), 778 "Interface name has bad constant pool index %u in class file %s", 779 interface_index, CHECK_NULL); 780 if (_cp->tag_at(interface_index).is_klass()) { 781 interf = KlassHandle(THREAD, _cp->resolved_klass_at(interface_index)); 782 } else { 783 Symbol* unresolved_klass = _cp->klass_name_at(interface_index); 784 785 // Don't need to check legal name because it's checked when parsing constant pool. 786 // But need to make sure it's not an array type. 787 guarantee_property(unresolved_klass->byte_at(0) != JVM_SIGNATURE_ARRAY, 788 "Bad interface name in class file %s", CHECK_NULL); 789 Handle class_loader(THREAD, _loader_data->class_loader()); 790 791 // Call resolve_super so classcircularity is checked 792 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, 793 unresolved_klass, class_loader, protection_domain, 794 false, CHECK_NULL); 795 interf = KlassHandle(THREAD, k); 796 } 797 798 if (!interf()->is_interface()) { 799 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(), "Implementing class", NULL); 800 } 801 if (InstanceKlass::cast(interf())->has_default_methods()) { 802 *has_default_methods = true; 803 } 804 _local_interfaces->at_put(index, interf()); 805 } 806 807 if (!_need_verify || length <= 1) { 808 return _local_interfaces; 809 } 810 811 // Check if there's any duplicates in interfaces 812 ResourceMark rm(THREAD); 813 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD( 814 THREAD, NameSigHash*, HASH_ROW_SIZE); 815 initialize_hashtable(interface_names); 816 bool dup = false; 817 { 818 debug_only(No_Safepoint_Verifier nsv;) 819 for (index = 0; index < length; index++) { 820 Klass* k = _local_interfaces->at(index); 821 Symbol* name = InstanceKlass::cast(k)->name(); 822 // If no duplicates, add (name, NULL) in hashtable interface_names. 823 if (!put_after_lookup(name, NULL, interface_names)) { 824 dup = true; 825 break; 826 } 827 } 828 } 829 if (dup) { 830 classfile_parse_error("Duplicate interface name in class file %s", CHECK_NULL); 831 } 832 } 833 return _local_interfaces; 834 } 835 836 837 void ClassFileParser::verify_constantvalue(int constantvalue_index, int signature_index, TRAPS) { 838 // Make sure the constant pool entry is of a type appropriate to this field 839 guarantee_property( 840 (constantvalue_index > 0 && 841 constantvalue_index < _cp->length()), 842 "Bad initial value index %u in ConstantValue attribute in class file %s", 843 constantvalue_index, CHECK); 844 constantTag value_type = _cp->tag_at(constantvalue_index); 845 switch ( _cp->basic_type_for_signature_at(signature_index) ) { 846 case T_LONG: 847 guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); 848 break; 849 case T_FLOAT: 850 guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); 851 break; 852 case T_DOUBLE: 853 guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); 854 break; 855 case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: 856 guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); 857 break; 858 case T_OBJECT: 859 guarantee_property((_cp->symbol_at(signature_index)->equals("Ljava/lang/String;") 860 && value_type.is_string()), 861 "Bad string initial value in class file %s", CHECK); 862 break; 863 default: 864 classfile_parse_error( 865 "Unable to set initial value %u in class file %s", 866 constantvalue_index, CHECK); 867 } 868 } 869 870 871 // Parse attributes for a field. 872 void ClassFileParser::parse_field_attributes(u2 attributes_count, 873 bool is_static, u2 signature_index, 874 u2* constantvalue_index_addr, 875 bool* is_synthetic_addr, 876 u2* generic_signature_index_addr, 877 ClassFileParser::FieldAnnotationCollector* parsed_annotations, 878 TRAPS) { 879 ClassFileStream* cfs = stream(); 880 assert(attributes_count > 0, "length should be greater than 0"); 881 u2 constantvalue_index = 0; 882 u2 generic_signature_index = 0; 883 bool is_synthetic = false; 884 u1* runtime_visible_annotations = NULL; 885 int runtime_visible_annotations_length = 0; 886 u1* runtime_invisible_annotations = NULL; 887 int runtime_invisible_annotations_length = 0; 888 u1* runtime_visible_type_annotations = NULL; 889 int runtime_visible_type_annotations_length = 0; 890 u1* runtime_invisible_type_annotations = NULL; 891 int runtime_invisible_type_annotations_length = 0; 892 while (attributes_count--) { 893 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 894 u2 attribute_name_index = cfs->get_u2_fast(); 895 u4 attribute_length = cfs->get_u4_fast(); 896 check_property(valid_symbol_at(attribute_name_index), 897 "Invalid field attribute index %u in class file %s", 898 attribute_name_index, 899 CHECK); 900 Symbol* attribute_name = _cp->symbol_at(attribute_name_index); 901 if (is_static && attribute_name == vmSymbols::tag_constant_value()) { 902 // ignore if non-static 903 if (constantvalue_index != 0) { 904 classfile_parse_error("Duplicate ConstantValue attribute in class file %s", CHECK); 905 } 906 check_property( 907 attribute_length == 2, 908 "Invalid ConstantValue field attribute length %u in class file %s", 909 attribute_length, CHECK); 910 constantvalue_index = cfs->get_u2(CHECK); 911 if (_need_verify) { 912 verify_constantvalue(constantvalue_index, signature_index, CHECK); 913 } 914 } else if (attribute_name == vmSymbols::tag_synthetic()) { 915 if (attribute_length != 0) { 916 classfile_parse_error( 917 "Invalid Synthetic field attribute length %u in class file %s", 918 attribute_length, CHECK); 919 } 920 is_synthetic = true; 921 } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 922 if (attribute_length != 0) { 923 classfile_parse_error( 924 "Invalid Deprecated field attribute length %u in class file %s", 925 attribute_length, CHECK); 926 } 927 } else if (_major_version >= JAVA_1_5_VERSION) { 928 if (attribute_name == vmSymbols::tag_signature()) { 929 if (attribute_length != 2) { 930 classfile_parse_error( 931 "Wrong size %u for field's Signature attribute in class file %s", 932 attribute_length, CHECK); 933 } 934 generic_signature_index = cfs->get_u2(CHECK); 935 } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 936 runtime_visible_annotations_length = attribute_length; 937 runtime_visible_annotations = cfs->get_u1_buffer(); 938 assert(runtime_visible_annotations != NULL, "null visible annotations"); 939 parse_annotations(runtime_visible_annotations, 940 runtime_visible_annotations_length, 941 parsed_annotations, 942 CHECK); 943 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 944 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 945 runtime_invisible_annotations_length = attribute_length; 946 runtime_invisible_annotations = cfs->get_u1_buffer(); 947 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 948 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 949 } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 950 runtime_visible_type_annotations_length = attribute_length; 951 runtime_visible_type_annotations = cfs->get_u1_buffer(); 952 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 953 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 954 } else if (PreserveAllAnnotations && attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 955 runtime_invisible_type_annotations_length = attribute_length; 956 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 957 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 958 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK); 959 } else { 960 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 961 } 962 } else { 963 cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes 964 } 965 } 966 967 *constantvalue_index_addr = constantvalue_index; 968 *is_synthetic_addr = is_synthetic; 969 *generic_signature_index_addr = generic_signature_index; 970 AnnotationArray* a = assemble_annotations(runtime_visible_annotations, 971 runtime_visible_annotations_length, 972 runtime_invisible_annotations, 973 runtime_invisible_annotations_length, 974 CHECK); 975 parsed_annotations->set_field_annotations(a); 976 a = assemble_annotations(runtime_visible_type_annotations, 977 runtime_visible_type_annotations_length, 978 runtime_invisible_type_annotations, 979 runtime_invisible_type_annotations_length, 980 CHECK); 981 parsed_annotations->set_field_type_annotations(a); 982 return; 983 } 984 985 986 // Field allocation types. Used for computing field offsets. 987 988 enum FieldAllocationType { 989 STATIC_OOP, // Oops 990 STATIC_BYTE, // Boolean, Byte, char 991 STATIC_SHORT, // shorts 992 STATIC_WORD, // ints 993 STATIC_DOUBLE, // aligned long or double 994 NONSTATIC_OOP, 995 NONSTATIC_BYTE, 996 NONSTATIC_SHORT, 997 NONSTATIC_WORD, 998 NONSTATIC_DOUBLE, 999 MAX_FIELD_ALLOCATION_TYPE, 1000 BAD_ALLOCATION_TYPE = -1 1001 }; 1002 1003 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = { 1004 BAD_ALLOCATION_TYPE, // 0 1005 BAD_ALLOCATION_TYPE, // 1 1006 BAD_ALLOCATION_TYPE, // 2 1007 BAD_ALLOCATION_TYPE, // 3 1008 NONSTATIC_BYTE , // T_BOOLEAN = 4, 1009 NONSTATIC_SHORT, // T_CHAR = 5, 1010 NONSTATIC_WORD, // T_FLOAT = 6, 1011 NONSTATIC_DOUBLE, // T_DOUBLE = 7, 1012 NONSTATIC_BYTE, // T_BYTE = 8, 1013 NONSTATIC_SHORT, // T_SHORT = 9, 1014 NONSTATIC_WORD, // T_INT = 10, 1015 NONSTATIC_DOUBLE, // T_LONG = 11, 1016 NONSTATIC_OOP, // T_OBJECT = 12, 1017 NONSTATIC_OOP, // T_ARRAY = 13, 1018 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1019 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1020 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1021 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1022 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1023 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1024 BAD_ALLOCATION_TYPE, // 0 1025 BAD_ALLOCATION_TYPE, // 1 1026 BAD_ALLOCATION_TYPE, // 2 1027 BAD_ALLOCATION_TYPE, // 3 1028 STATIC_BYTE , // T_BOOLEAN = 4, 1029 STATIC_SHORT, // T_CHAR = 5, 1030 STATIC_WORD, // T_FLOAT = 6, 1031 STATIC_DOUBLE, // T_DOUBLE = 7, 1032 STATIC_BYTE, // T_BYTE = 8, 1033 STATIC_SHORT, // T_SHORT = 9, 1034 STATIC_WORD, // T_INT = 10, 1035 STATIC_DOUBLE, // T_LONG = 11, 1036 STATIC_OOP, // T_OBJECT = 12, 1037 STATIC_OOP, // T_ARRAY = 13, 1038 BAD_ALLOCATION_TYPE, // T_VOID = 14, 1039 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15, 1040 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16, 1041 BAD_ALLOCATION_TYPE, // T_METADATA = 17, 1042 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18, 1043 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19, 1044 }; 1045 1046 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) { 1047 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values"); 1048 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)]; 1049 assert(result != BAD_ALLOCATION_TYPE, "bad type"); 1050 return result; 1051 } 1052 1053 class FieldAllocationCount: public ResourceObj { 1054 public: 1055 u2 count[MAX_FIELD_ALLOCATION_TYPE]; 1056 1057 FieldAllocationCount() { 1058 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) { 1059 count[i] = 0; 1060 } 1061 } 1062 1063 FieldAllocationType update(bool is_static, BasicType type) { 1064 FieldAllocationType atype = basic_type_to_atype(is_static, type); 1065 // Make sure there is no overflow with injected fields. 1066 assert(count[atype] < 0xFFFF, "More than 65535 fields"); 1067 count[atype]++; 1068 return atype; 1069 } 1070 }; 1071 1072 Array<u2>* ClassFileParser::parse_fields(Symbol* class_name, 1073 bool is_interface, 1074 FieldAllocationCount *fac, 1075 u2* java_fields_count_ptr, TRAPS) { 1076 ClassFileStream* cfs = stream(); 1077 cfs->guarantee_more(2, CHECK_NULL); // length 1078 u2 length = cfs->get_u2_fast(); 1079 *java_fields_count_ptr = length; 1080 1081 int num_injected = 0; 1082 InjectedField* injected = JavaClasses::get_injected(class_name, &num_injected); 1083 int total_fields = length + num_injected; 1084 1085 // The field array starts with tuples of shorts 1086 // [access, name index, sig index, initial value index, byte offset]. 1087 // A generic signature slot only exists for field with generic 1088 // signature attribute. And the access flag is set with 1089 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic 1090 // signature slots are at the end of the field array and after all 1091 // other fields data. 1092 // 1093 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 1094 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 1095 // ... 1096 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 1097 // [generic signature index] 1098 // [generic signature index] 1099 // ... 1100 // 1101 // Allocate a temporary resource array for field data. For each field, 1102 // a slot is reserved in the temporary array for the generic signature 1103 // index. After parsing all fields, the data are copied to a permanent 1104 // array and any unused slots will be discarded. 1105 ResourceMark rm(THREAD); 1106 u2* fa = NEW_RESOURCE_ARRAY_IN_THREAD( 1107 THREAD, u2, total_fields * (FieldInfo::field_slots + 1)); 1108 1109 // The generic signature slots start after all other fields' data. 1110 int generic_signature_slot = total_fields * FieldInfo::field_slots; 1111 int num_generic_signature = 0; 1112 for (int n = 0; n < length; n++) { 1113 cfs->guarantee_more(8, CHECK_NULL); // access_flags, name_index, descriptor_index, attributes_count 1114 1115 AccessFlags access_flags; 1116 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; 1117 verify_legal_field_modifiers(flags, is_interface, CHECK_NULL); 1118 access_flags.set_flags(flags); 1119 1120 u2 name_index = cfs->get_u2_fast(); 1121 int cp_size = _cp->length(); 1122 check_property(valid_symbol_at(name_index), 1123 "Invalid constant pool index %u for field name in class file %s", 1124 name_index, 1125 CHECK_NULL); 1126 Symbol* name = _cp->symbol_at(name_index); 1127 verify_legal_field_name(name, CHECK_NULL); 1128 1129 u2 signature_index = cfs->get_u2_fast(); 1130 check_property(valid_symbol_at(signature_index), 1131 "Invalid constant pool index %u for field signature in class file %s", 1132 signature_index, CHECK_NULL); 1133 Symbol* sig = _cp->symbol_at(signature_index); 1134 verify_legal_field_signature(name, sig, CHECK_NULL); 1135 1136 u2 constantvalue_index = 0; 1137 bool is_synthetic = false; 1138 u2 generic_signature_index = 0; 1139 bool is_static = access_flags.is_static(); 1140 FieldAnnotationCollector parsed_annotations(_loader_data); 1141 1142 u2 attributes_count = cfs->get_u2_fast(); 1143 if (attributes_count > 0) { 1144 parse_field_attributes(attributes_count, is_static, signature_index, 1145 &constantvalue_index, &is_synthetic, 1146 &generic_signature_index, &parsed_annotations, 1147 CHECK_NULL); 1148 if (parsed_annotations.field_annotations() != NULL) { 1149 if (_fields_annotations == NULL) { 1150 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>( 1151 _loader_data, length, NULL, 1152 CHECK_NULL); 1153 } 1154 _fields_annotations->at_put(n, parsed_annotations.field_annotations()); 1155 parsed_annotations.set_field_annotations(NULL); 1156 } 1157 if (parsed_annotations.field_type_annotations() != NULL) { 1158 if (_fields_type_annotations == NULL) { 1159 _fields_type_annotations = MetadataFactory::new_array<AnnotationArray*>( 1160 _loader_data, length, NULL, 1161 CHECK_NULL); 1162 } 1163 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); 1164 parsed_annotations.set_field_type_annotations(NULL); 1165 } 1166 1167 if (is_synthetic) { 1168 access_flags.set_is_synthetic(); 1169 } 1170 if (generic_signature_index != 0) { 1171 access_flags.set_field_has_generic_signature(); 1172 fa[generic_signature_slot] = generic_signature_index; 1173 generic_signature_slot ++; 1174 num_generic_signature ++; 1175 } 1176 } 1177 1178 FieldInfo* field = FieldInfo::from_field_array(fa, n); 1179 field->initialize(access_flags.as_short(), 1180 name_index, 1181 signature_index, 1182 constantvalue_index); 1183 BasicType type = _cp->basic_type_for_signature_at(signature_index); 1184 1185 // Remember how many oops we encountered and compute allocation type 1186 FieldAllocationType atype = fac->update(is_static, type); 1187 field->set_allocation_type(atype); 1188 1189 // After field is initialized with type, we can augment it with aux info 1190 if (parsed_annotations.has_any_annotations()) 1191 parsed_annotations.apply_to(field); 1192 } 1193 1194 int index = length; 1195 if (num_injected != 0) { 1196 for (int n = 0; n < num_injected; n++) { 1197 // Check for duplicates 1198 if (injected[n].may_be_java) { 1199 Symbol* name = injected[n].name(); 1200 Symbol* signature = injected[n].signature(); 1201 bool duplicate = false; 1202 for (int i = 0; i < length; i++) { 1203 FieldInfo* f = FieldInfo::from_field_array(fa, i); 1204 if (name == _cp->symbol_at(f->name_index()) && 1205 signature == _cp->symbol_at(f->signature_index())) { 1206 // Symbol is desclared in Java so skip this one 1207 duplicate = true; 1208 break; 1209 } 1210 } 1211 if (duplicate) { 1212 // These will be removed from the field array at the end 1213 continue; 1214 } 1215 } 1216 1217 // Injected field 1218 FieldInfo* field = FieldInfo::from_field_array(fa, index); 1219 field->initialize(JVM_ACC_FIELD_INTERNAL, 1220 injected[n].name_index, 1221 injected[n].signature_index, 1222 0); 1223 1224 BasicType type = FieldType::basic_type(injected[n].signature()); 1225 1226 // Remember how many oops we encountered and compute allocation type 1227 FieldAllocationType atype = fac->update(false, type); 1228 field->set_allocation_type(atype); 1229 index++; 1230 } 1231 } 1232 1233 // Now copy the fields' data from the temporary resource array. 1234 // Sometimes injected fields already exist in the Java source so 1235 // the fields array could be too long. In that case the 1236 // fields array is trimed. Also unused slots that were reserved 1237 // for generic signature indexes are discarded. 1238 Array<u2>* fields = MetadataFactory::new_array<u2>( 1239 _loader_data, index * FieldInfo::field_slots + num_generic_signature, 1240 CHECK_NULL); 1241 _fields = fields; // save in case of error 1242 { 1243 int i = 0; 1244 for (; i < index * FieldInfo::field_slots; i++) { 1245 fields->at_put(i, fa[i]); 1246 } 1247 for (int j = total_fields * FieldInfo::field_slots; 1248 j < generic_signature_slot; j++) { 1249 fields->at_put(i++, fa[j]); 1250 } 1251 assert(i == fields->length(), ""); 1252 } 1253 1254 if (_need_verify && length > 1) { 1255 // Check duplicated fields 1256 ResourceMark rm(THREAD); 1257 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 1258 THREAD, NameSigHash*, HASH_ROW_SIZE); 1259 initialize_hashtable(names_and_sigs); 1260 bool dup = false; 1261 { 1262 debug_only(No_Safepoint_Verifier nsv;) 1263 for (AllFieldStream fs(fields, _cp); !fs.done(); fs.next()) { 1264 Symbol* name = fs.name(); 1265 Symbol* sig = fs.signature(); 1266 // If no duplicates, add name/signature in hashtable names_and_sigs. 1267 if (!put_after_lookup(name, sig, names_and_sigs)) { 1268 dup = true; 1269 break; 1270 } 1271 } 1272 } 1273 if (dup) { 1274 classfile_parse_error("Duplicate field name&signature in class file %s", 1275 CHECK_NULL); 1276 } 1277 } 1278 1279 return fields; 1280 } 1281 1282 1283 static void copy_u2_with_conversion(u2* dest, u2* src, int length) { 1284 while (length-- > 0) { 1285 *dest++ = Bytes::get_Java_u2((u1*) (src++)); 1286 } 1287 } 1288 1289 1290 u2* ClassFileParser::parse_exception_table(u4 code_length, 1291 u4 exception_table_length, 1292 TRAPS) { 1293 ClassFileStream* cfs = stream(); 1294 1295 u2* exception_table_start = cfs->get_u2_buffer(); 1296 assert(exception_table_start != NULL, "null exception table"); 1297 cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, end_pc, handler_pc, catch_type_index 1298 // Will check legal target after parsing code array in verifier. 1299 if (_need_verify) { 1300 for (unsigned int i = 0; i < exception_table_length; i++) { 1301 u2 start_pc = cfs->get_u2_fast(); 1302 u2 end_pc = cfs->get_u2_fast(); 1303 u2 handler_pc = cfs->get_u2_fast(); 1304 u2 catch_type_index = cfs->get_u2_fast(); 1305 guarantee_property((start_pc < end_pc) && (end_pc <= code_length), 1306 "Illegal exception table range in class file %s", 1307 CHECK_NULL); 1308 guarantee_property(handler_pc < code_length, 1309 "Illegal exception table handler in class file %s", 1310 CHECK_NULL); 1311 if (catch_type_index != 0) { 1312 guarantee_property(valid_klass_reference_at(catch_type_index), 1313 "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); 1314 } 1315 } 1316 } else { 1317 cfs->skip_u2_fast(exception_table_length * 4); 1318 } 1319 return exception_table_start; 1320 } 1321 1322 void ClassFileParser::parse_linenumber_table( 1323 u4 code_attribute_length, u4 code_length, 1324 CompressedLineNumberWriteStream** write_stream, TRAPS) { 1325 ClassFileStream* cfs = stream(); 1326 unsigned int num_entries = cfs->get_u2(CHECK); 1327 1328 // Each entry is a u2 start_pc, and a u2 line_number 1329 unsigned int length_in_bytes = num_entries * (sizeof(u2) + sizeof(u2)); 1330 1331 // Verify line number attribute and table length 1332 check_property( 1333 code_attribute_length == sizeof(u2) + length_in_bytes, 1334 "LineNumberTable attribute has wrong length in class file %s", CHECK); 1335 1336 cfs->guarantee_more(length_in_bytes, CHECK); 1337 1338 if ((*write_stream) == NULL) { 1339 if (length_in_bytes > fixed_buffer_size) { 1340 (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); 1341 } else { 1342 (*write_stream) = new CompressedLineNumberWriteStream( 1343 linenumbertable_buffer, fixed_buffer_size); 1344 } 1345 } 1346 1347 while (num_entries-- > 0) { 1348 u2 bci = cfs->get_u2_fast(); // start_pc 1349 u2 line = cfs->get_u2_fast(); // line_number 1350 guarantee_property(bci < code_length, 1351 "Invalid pc in LineNumberTable in class file %s", CHECK); 1352 (*write_stream)->write_pair(bci, line); 1353 } 1354 } 1355 1356 1357 // Class file LocalVariableTable elements. 1358 class Classfile_LVT_Element VALUE_OBJ_CLASS_SPEC { 1359 public: 1360 u2 start_bci; 1361 u2 length; 1362 u2 name_cp_index; 1363 u2 descriptor_cp_index; 1364 u2 slot; 1365 }; 1366 1367 1368 class LVT_Hash: public CHeapObj<mtClass> { 1369 public: 1370 LocalVariableTableElement *_elem; // element 1371 LVT_Hash* _next; // Next entry in hash table 1372 }; 1373 1374 unsigned int hash(LocalVariableTableElement *elem) { 1375 unsigned int raw_hash = elem->start_bci; 1376 1377 raw_hash = elem->length + raw_hash * 37; 1378 raw_hash = elem->name_cp_index + raw_hash * 37; 1379 raw_hash = elem->slot + raw_hash * 37; 1380 1381 return raw_hash % HASH_ROW_SIZE; 1382 } 1383 1384 void initialize_hashtable(LVT_Hash** table) { 1385 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1386 table[i] = NULL; 1387 } 1388 } 1389 1390 void clear_hashtable(LVT_Hash** table) { 1391 for (int i = 0; i < HASH_ROW_SIZE; i++) { 1392 LVT_Hash* current = table[i]; 1393 LVT_Hash* next; 1394 while (current != NULL) { 1395 next = current->_next; 1396 current->_next = NULL; 1397 delete(current); 1398 current = next; 1399 } 1400 table[i] = NULL; 1401 } 1402 } 1403 1404 LVT_Hash* LVT_lookup(LocalVariableTableElement *elem, int index, LVT_Hash** table) { 1405 LVT_Hash* entry = table[index]; 1406 1407 /* 1408 * 3-tuple start_bci/length/slot has to be unique key, 1409 * so the following comparison seems to be redundant: 1410 * && elem->name_cp_index == entry->_elem->name_cp_index 1411 */ 1412 while (entry != NULL) { 1413 if (elem->start_bci == entry->_elem->start_bci 1414 && elem->length == entry->_elem->length 1415 && elem->name_cp_index == entry->_elem->name_cp_index 1416 && elem->slot == entry->_elem->slot 1417 ) { 1418 return entry; 1419 } 1420 entry = entry->_next; 1421 } 1422 return NULL; 1423 } 1424 1425 // Return false if the local variable is found in table. 1426 // Return true if no duplicate is found. 1427 // And local variable is added as a new entry in table. 1428 bool LVT_put_after_lookup(LocalVariableTableElement *elem, LVT_Hash** table) { 1429 // First lookup for duplicates 1430 int index = hash(elem); 1431 LVT_Hash* entry = LVT_lookup(elem, index, table); 1432 1433 if (entry != NULL) { 1434 return false; 1435 } 1436 // No duplicate is found, allocate a new entry and fill it. 1437 if ((entry = new LVT_Hash()) == NULL) { 1438 return false; 1439 } 1440 entry->_elem = elem; 1441 1442 // Insert into hash table 1443 entry->_next = table[index]; 1444 table[index] = entry; 1445 1446 return true; 1447 } 1448 1449 void copy_lvt_element(Classfile_LVT_Element *src, LocalVariableTableElement *lvt) { 1450 lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); 1451 lvt->length = Bytes::get_Java_u2((u1*) &src->length); 1452 lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); 1453 lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); 1454 lvt->signature_cp_index = 0; 1455 lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); 1456 } 1457 1458 // Function is used to parse both attributes: 1459 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) 1460 u2* ClassFileParser::parse_localvariable_table(u4 code_length, 1461 u2 max_locals, 1462 u4 code_attribute_length, 1463 u2* localvariable_table_length, 1464 bool isLVTT, 1465 TRAPS) { 1466 ClassFileStream* cfs = stream(); 1467 const char * tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; 1468 *localvariable_table_length = cfs->get_u2(CHECK_NULL); 1469 unsigned int size = (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2); 1470 // Verify local variable table attribute has right length 1471 if (_need_verify) { 1472 guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), 1473 "%s has wrong length in class file %s", tbl_name, CHECK_NULL); 1474 } 1475 u2* localvariable_table_start = cfs->get_u2_buffer(); 1476 assert(localvariable_table_start != NULL, "null local variable table"); 1477 if (!_need_verify) { 1478 cfs->skip_u2_fast(size); 1479 } else { 1480 cfs->guarantee_more(size * 2, CHECK_NULL); 1481 for(int i = 0; i < (*localvariable_table_length); i++) { 1482 u2 start_pc = cfs->get_u2_fast(); 1483 u2 length = cfs->get_u2_fast(); 1484 u2 name_index = cfs->get_u2_fast(); 1485 u2 descriptor_index = cfs->get_u2_fast(); 1486 u2 index = cfs->get_u2_fast(); 1487 // Assign to a u4 to avoid overflow 1488 u4 end_pc = (u4)start_pc + (u4)length; 1489 1490 if (start_pc >= code_length) { 1491 classfile_parse_error( 1492 "Invalid start_pc %u in %s in class file %s", 1493 start_pc, tbl_name, CHECK_NULL); 1494 } 1495 if (end_pc > code_length) { 1496 classfile_parse_error( 1497 "Invalid length %u in %s in class file %s", 1498 length, tbl_name, CHECK_NULL); 1499 } 1500 int cp_size = _cp->length(); 1501 guarantee_property(valid_symbol_at(name_index), 1502 "Name index %u in %s has bad constant type in class file %s", 1503 name_index, tbl_name, CHECK_NULL); 1504 guarantee_property(valid_symbol_at(descriptor_index), 1505 "Signature index %u in %s has bad constant type in class file %s", 1506 descriptor_index, tbl_name, CHECK_NULL); 1507 1508 Symbol* name = _cp->symbol_at(name_index); 1509 Symbol* sig = _cp->symbol_at(descriptor_index); 1510 verify_legal_field_name(name, CHECK_NULL); 1511 u2 extra_slot = 0; 1512 if (!isLVTT) { 1513 verify_legal_field_signature(name, sig, CHECK_NULL); 1514 1515 // 4894874: check special cases for double and long local variables 1516 if (sig == vmSymbols::type_signature(T_DOUBLE) || 1517 sig == vmSymbols::type_signature(T_LONG)) { 1518 extra_slot = 1; 1519 } 1520 } 1521 guarantee_property((index + extra_slot) < max_locals, 1522 "Invalid index %u in %s in class file %s", 1523 index, tbl_name, CHECK_NULL); 1524 } 1525 } 1526 return localvariable_table_start; 1527 } 1528 1529 1530 void ClassFileParser::parse_type_array(u2 array_length, u4 code_length, u4* u1_index, u4* u2_index, 1531 u1* u1_array, u2* u2_array, TRAPS) { 1532 ClassFileStream* cfs = stream(); 1533 u2 index = 0; // index in the array with long/double occupying two slots 1534 u4 i1 = *u1_index; 1535 u4 i2 = *u2_index + 1; 1536 for(int i = 0; i < array_length; i++) { 1537 u1 tag = u1_array[i1++] = cfs->get_u1(CHECK); 1538 index++; 1539 if (tag == ITEM_Long || tag == ITEM_Double) { 1540 index++; 1541 } else if (tag == ITEM_Object) { 1542 u2 class_index = u2_array[i2++] = cfs->get_u2(CHECK); 1543 guarantee_property(valid_klass_reference_at(class_index), 1544 "Bad class index %u in StackMap in class file %s", 1545 class_index, CHECK); 1546 } else if (tag == ITEM_Uninitialized) { 1547 u2 offset = u2_array[i2++] = cfs->get_u2(CHECK); 1548 guarantee_property( 1549 offset < code_length, 1550 "Bad uninitialized type offset %u in StackMap in class file %s", 1551 offset, CHECK); 1552 } else { 1553 guarantee_property( 1554 tag <= (u1)ITEM_Uninitialized, 1555 "Unknown variable type %u in StackMap in class file %s", 1556 tag, CHECK); 1557 } 1558 } 1559 u2_array[*u2_index] = index; 1560 *u1_index = i1; 1561 *u2_index = i2; 1562 } 1563 1564 u1* ClassFileParser::parse_stackmap_table( 1565 u4 code_attribute_length, TRAPS) { 1566 if (code_attribute_length == 0) 1567 return NULL; 1568 1569 ClassFileStream* cfs = stream(); 1570 u1* stackmap_table_start = cfs->get_u1_buffer(); 1571 assert(stackmap_table_start != NULL, "null stackmap table"); 1572 1573 // check code_attribute_length first 1574 stream()->skip_u1(code_attribute_length, CHECK_NULL); 1575 1576 if (!_need_verify && !DumpSharedSpaces) { 1577 return NULL; 1578 } 1579 return stackmap_table_start; 1580 } 1581 1582 u2* ClassFileParser::parse_checked_exceptions(u2* checked_exceptions_length, 1583 u4 method_attribute_length, 1584 TRAPS) { 1585 ClassFileStream* cfs = stream(); 1586 cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length 1587 *checked_exceptions_length = cfs->get_u2_fast(); 1588 unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); 1589 u2* checked_exceptions_start = cfs->get_u2_buffer(); 1590 assert(checked_exceptions_start != NULL, "null checked exceptions"); 1591 if (!_need_verify) { 1592 cfs->skip_u2_fast(size); 1593 } else { 1594 // Verify each value in the checked exception table 1595 u2 checked_exception; 1596 u2 len = *checked_exceptions_length; 1597 cfs->guarantee_more(2 * len, CHECK_NULL); 1598 for (int i = 0; i < len; i++) { 1599 checked_exception = cfs->get_u2_fast(); 1600 check_property( 1601 valid_klass_reference_at(checked_exception), 1602 "Exception name has bad type at constant pool %u in class file %s", 1603 checked_exception, CHECK_NULL); 1604 } 1605 } 1606 // check exceptions attribute length 1607 if (_need_verify) { 1608 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + 1609 sizeof(u2) * size), 1610 "Exceptions attribute has wrong length in class file %s", CHECK_NULL); 1611 } 1612 return checked_exceptions_start; 1613 } 1614 1615 void ClassFileParser::throwIllegalSignature( 1616 const char* type, Symbol* name, Symbol* sig, TRAPS) { 1617 ResourceMark rm(THREAD); 1618 Exceptions::fthrow(THREAD_AND_LOCATION, 1619 vmSymbols::java_lang_ClassFormatError(), 1620 "%s \"%s\" in class %s has illegal signature \"%s\"", type, 1621 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); 1622 } 1623 1624 // Skip an annotation. Return >=limit if there is any problem. 1625 int ClassFileParser::skip_annotation(u1* buffer, int limit, int index) { 1626 // annotation := atype:u2 do(nmem:u2) {member:u2 value} 1627 // value := switch (tag:u1) { ... } 1628 index += 2; // skip atype 1629 if ((index += 2) >= limit) return limit; // read nmem 1630 int nmem = Bytes::get_Java_u2(buffer+index-2); 1631 while (--nmem >= 0 && index < limit) { 1632 index += 2; // skip member 1633 index = skip_annotation_value(buffer, limit, index); 1634 } 1635 return index; 1636 } 1637 1638 // Skip an annotation value. Return >=limit if there is any problem. 1639 int ClassFileParser::skip_annotation_value(u1* buffer, int limit, int index) { 1640 // value := switch (tag:u1) { 1641 // case B, C, I, S, Z, D, F, J, c: con:u2; 1642 // case e: e_class:u2 e_name:u2; 1643 // case s: s_con:u2; 1644 // case [: do(nval:u2) {value}; 1645 // case @: annotation; 1646 // case s: s_con:u2; 1647 // } 1648 if ((index += 1) >= limit) return limit; // read tag 1649 u1 tag = buffer[index-1]; 1650 switch (tag) { 1651 case 'B': case 'C': case 'I': case 'S': case 'Z': 1652 case 'D': case 'F': case 'J': case 'c': case 's': 1653 index += 2; // skip con or s_con 1654 break; 1655 case 'e': 1656 index += 4; // skip e_class, e_name 1657 break; 1658 case '[': 1659 { 1660 if ((index += 2) >= limit) return limit; // read nval 1661 int nval = Bytes::get_Java_u2(buffer+index-2); 1662 while (--nval >= 0 && index < limit) { 1663 index = skip_annotation_value(buffer, limit, index); 1664 } 1665 } 1666 break; 1667 case '@': 1668 index = skip_annotation(buffer, limit, index); 1669 break; 1670 default: 1671 assert(false, "annotation tag"); 1672 return limit; // bad tag byte 1673 } 1674 return index; 1675 } 1676 1677 // Sift through annotations, looking for those significant to the VM: 1678 void ClassFileParser::parse_annotations(u1* buffer, int limit, 1679 ClassFileParser::AnnotationCollector* coll, 1680 TRAPS) { 1681 // annotations := do(nann:u2) {annotation} 1682 int index = 0; 1683 if ((index += 2) >= limit) return; // read nann 1684 int nann = Bytes::get_Java_u2(buffer+index-2); 1685 enum { // initial annotation layout 1686 atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' 1687 count_off = 2, // u2 such as 1 (one value) 1688 member_off = 4, // utf8 such as 'value' 1689 tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) 1690 e_tag_val = 'e', 1691 e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' 1692 e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' 1693 e_size = 11, // end of 'e' annotation 1694 c_tag_val = 'c', // payload is type 1695 c_con_off = 7, // utf8 payload, such as 'I' 1696 c_size = 9, // end of 'c' annotation 1697 s_tag_val = 's', // payload is String 1698 s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' 1699 s_size = 9, 1700 min_size = 6 // smallest possible size (zero members) 1701 }; 1702 while ((--nann) >= 0 && (index-2 + min_size <= limit)) { 1703 int index0 = index; 1704 index = skip_annotation(buffer, limit, index); 1705 u1* abase = buffer + index0; 1706 int atype = Bytes::get_Java_u2(abase + atype_off); 1707 int count = Bytes::get_Java_u2(abase + count_off); 1708 Symbol* aname = check_symbol_at(_cp, atype); 1709 if (aname == NULL) break; // invalid annotation name 1710 Symbol* member = NULL; 1711 if (count >= 1) { 1712 int member_index = Bytes::get_Java_u2(abase + member_off); 1713 member = check_symbol_at(_cp, member_index); 1714 if (member == NULL) break; // invalid member name 1715 } 1716 1717 // Here is where parsing particular annotations will take place. 1718 AnnotationCollector::ID id = coll->annotation_index(_loader_data, aname); 1719 if (id == AnnotationCollector::_unknown) continue; 1720 coll->set_annotation(id); 1721 1722 if (id == AnnotationCollector::_sun_misc_Contended) { 1723 // @Contended can optionally specify the contention group. 1724 // 1725 // Contended group defines the equivalence class over the fields: 1726 // the fields within the same contended group are not treated distinct. 1727 // The only exception is default group, which does not incur the 1728 // equivalence. Naturally, contention group for classes is meaningless. 1729 // 1730 // While the contention group is specified as String, annotation 1731 // values are already interned, and we might as well use the constant 1732 // pool index as the group tag. 1733 // 1734 u2 group_index = 0; // default contended group 1735 if (count == 1 1736 && s_size == (index - index0) // match size 1737 && s_tag_val == *(abase + tag_off) 1738 && member == vmSymbols::value_name()) { 1739 group_index = Bytes::get_Java_u2(abase + s_con_off); 1740 if (_cp->symbol_at(group_index)->utf8_length() == 0) { 1741 group_index = 0; // default contended group 1742 } 1743 } 1744 coll->set_contended_group(group_index); 1745 } 1746 } 1747 } 1748 1749 ClassFileParser::AnnotationCollector::ID 1750 ClassFileParser::AnnotationCollector::annotation_index(ClassLoaderData* loader_data, 1751 Symbol* name) { 1752 vmSymbols::SID sid = vmSymbols::find_sid(name); 1753 // Privileged code can use all annotations. Other code silently drops some. 1754 const bool privileged = loader_data->is_the_null_class_loader_data() || 1755 loader_data->is_ext_class_loader_data() || 1756 loader_data->is_anonymous(); 1757 switch (sid) { 1758 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_reflect_CallerSensitive_signature): 1759 if (_location != _in_method) break; // only allow for methods 1760 if (!privileged) break; // only allow in privileged code 1761 return _method_CallerSensitive; 1762 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_ForceInline_signature): 1763 if (_location != _in_method) break; // only allow for methods 1764 if (!privileged) break; // only allow in privileged code 1765 return _method_ForceInline; 1766 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_DontInline_signature): 1767 if (_location != _in_method) break; // only allow for methods 1768 if (!privileged) break; // only allow in privileged code 1769 return _method_DontInline; 1770 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): 1771 if (_location != _in_method) break; // only allow for methods 1772 if (!privileged) break; // only allow in privileged code 1773 return _method_LambdaForm_Compiled; 1774 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Hidden_signature): 1775 if (_location != _in_method) break; // only allow for methods 1776 if (!privileged) break; // only allow in privileged code 1777 return _method_LambdaForm_Hidden; 1778 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_invoke_Stable_signature): 1779 if (_location != _in_field) break; // only allow for fields 1780 if (!privileged) break; // only allow in privileged code 1781 return _field_Stable; 1782 case vmSymbols::VM_SYMBOL_ENUM_NAME(sun_misc_Contended_signature): 1783 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1784 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1785 return _sun_misc_Contended; 1786 default: break; 1787 } 1788 return AnnotationCollector::_unknown; 1789 } 1790 1791 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1792 if (is_contended()) 1793 f->set_contended_group(contended_group()); 1794 if (is_stable()) 1795 f->set_stable(true); 1796 } 1797 1798 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1799 // If there's an error deallocate metadata for field annotations 1800 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1801 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1802 } 1803 1804 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1805 if (has_annotation(_method_CallerSensitive)) 1806 m->set_caller_sensitive(true); 1807 if (has_annotation(_method_ForceInline)) 1808 m->set_force_inline(true); 1809 if (has_annotation(_method_DontInline)) 1810 m->set_dont_inline(true); 1811 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1812 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1813 if (has_annotation(_method_LambdaForm_Hidden)) 1814 m->set_hidden(true); 1815 } 1816 1817 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1818 k->set_is_contended(is_contended()); 1819 } 1820 1821 1822 #define MAX_ARGS_SIZE 255 1823 #define MAX_CODE_SIZE 65535 1824 #define INITIAL_MAX_LVT_NUMBER 256 1825 1826 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1827 * 1828 * Rules for LVT's and LVTT's are: 1829 * - There can be any number of LVT's and LVTT's. 1830 * - If there are n LVT's, it is the same as if there was just 1831 * one LVT containing all the entries from the n LVT's. 1832 * - There may be no more than one LVT entry per local variable. 1833 * Two LVT entries are 'equal' if these fields are the same: 1834 * start_pc, length, name, slot 1835 * - There may be no more than one LVTT entry per each LVT entry. 1836 * Each LVTT entry has to match some LVT entry. 1837 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1838 */ 1839 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1840 int lvt_cnt, 1841 u2* localvariable_table_length, 1842 u2** localvariable_table_start, 1843 int lvtt_cnt, 1844 u2* localvariable_type_table_length, 1845 u2** localvariable_type_table_start, 1846 TRAPS) { 1847 1848 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1849 initialize_hashtable(lvt_Hash); 1850 1851 // To fill LocalVariableTable in 1852 Classfile_LVT_Element* cf_lvt; 1853 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1854 1855 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1856 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1857 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1858 copy_lvt_element(&cf_lvt[idx], lvt); 1859 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1860 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1861 && _need_verify 1862 && _major_version >= JAVA_1_5_VERSION) { 1863 clear_hashtable(lvt_Hash); 1864 classfile_parse_error("Duplicated LocalVariableTable attribute " 1865 "entry for '%s' in class file %s", 1866 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1867 CHECK); 1868 } 1869 } 1870 } 1871 1872 // To merge LocalVariableTable and LocalVariableTypeTable 1873 Classfile_LVT_Element* cf_lvtt; 1874 LocalVariableTableElement lvtt_elem; 1875 1876 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1877 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1878 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1879 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1880 int index = hash(&lvtt_elem); 1881 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1882 if (entry == NULL) { 1883 if (_need_verify) { 1884 clear_hashtable(lvt_Hash); 1885 classfile_parse_error("LVTT entry for '%s' in class file %s " 1886 "does not match any LVT entry", 1887 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1888 CHECK); 1889 } 1890 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1891 clear_hashtable(lvt_Hash); 1892 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1893 "entry for '%s' in class file %s", 1894 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1895 CHECK); 1896 } else { 1897 // to add generic signatures into LocalVariableTable 1898 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1899 } 1900 } 1901 } 1902 clear_hashtable(lvt_Hash); 1903 } 1904 1905 1906 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1907 u1* runtime_visible_annotations, 1908 int runtime_visible_annotations_length, 1909 u1* runtime_invisible_annotations, 1910 int runtime_invisible_annotations_length, 1911 u1* runtime_visible_parameter_annotations, 1912 int runtime_visible_parameter_annotations_length, 1913 u1* runtime_invisible_parameter_annotations, 1914 int runtime_invisible_parameter_annotations_length, 1915 u1* runtime_visible_type_annotations, 1916 int runtime_visible_type_annotations_length, 1917 u1* runtime_invisible_type_annotations, 1918 int runtime_invisible_type_annotations_length, 1919 u1* annotation_default, 1920 int annotation_default_length, 1921 TRAPS) { 1922 1923 AnnotationArray* a; 1924 1925 if (runtime_visible_annotations_length + 1926 runtime_invisible_annotations_length > 0) { 1927 a = assemble_annotations(runtime_visible_annotations, 1928 runtime_visible_annotations_length, 1929 runtime_invisible_annotations, 1930 runtime_invisible_annotations_length, 1931 CHECK); 1932 cm->set_method_annotations(a); 1933 } 1934 1935 if (runtime_visible_parameter_annotations_length + 1936 runtime_invisible_parameter_annotations_length > 0) { 1937 a = assemble_annotations(runtime_visible_parameter_annotations, 1938 runtime_visible_parameter_annotations_length, 1939 runtime_invisible_parameter_annotations, 1940 runtime_invisible_parameter_annotations_length, 1941 CHECK); 1942 cm->set_parameter_annotations(a); 1943 } 1944 1945 if (annotation_default_length > 0) { 1946 a = assemble_annotations(annotation_default, 1947 annotation_default_length, 1948 NULL, 1949 0, 1950 CHECK); 1951 cm->set_default_annotations(a); 1952 } 1953 1954 if (runtime_visible_type_annotations_length + 1955 runtime_invisible_type_annotations_length > 0) { 1956 a = assemble_annotations(runtime_visible_type_annotations, 1957 runtime_visible_type_annotations_length, 1958 runtime_invisible_type_annotations, 1959 runtime_invisible_type_annotations_length, 1960 CHECK); 1961 cm->set_type_annotations(a); 1962 } 1963 } 1964 1965 1966 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1967 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1968 // Method* to save footprint, so we only know the size of the resulting Method* when the 1969 // entire method attribute is parsed. 1970 // 1971 // The promoted_flags parameter is used to pass relevant access_flags 1972 // from the method back up to the containing klass. These flag values 1973 // are added to klass's access_flags. 1974 1975 methodHandle ClassFileParser::parse_method(bool is_interface, 1976 AccessFlags *promoted_flags, 1977 TRAPS) { 1978 ClassFileStream* cfs = stream(); 1979 methodHandle nullHandle; 1980 ResourceMark rm(THREAD); 1981 // Parse fixed parts 1982 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1983 1984 int flags = cfs->get_u2_fast(); 1985 u2 name_index = cfs->get_u2_fast(); 1986 int cp_size = _cp->length(); 1987 check_property( 1988 valid_symbol_at(name_index), 1989 "Illegal constant pool index %u for method name in class file %s", 1990 name_index, CHECK_(nullHandle)); 1991 Symbol* name = _cp->symbol_at(name_index); 1992 verify_legal_method_name(name, CHECK_(nullHandle)); 1993 1994 u2 signature_index = cfs->get_u2_fast(); 1995 guarantee_property( 1996 valid_symbol_at(signature_index), 1997 "Illegal constant pool index %u for method signature in class file %s", 1998 signature_index, CHECK_(nullHandle)); 1999 Symbol* signature = _cp->symbol_at(signature_index); 2000 2001 AccessFlags access_flags; 2002 if (name == vmSymbols::class_initializer_name()) { 2003 // We ignore the other access flags for a valid class initializer. 2004 // (JVM Spec 2nd ed., chapter 4.6) 2005 if (_major_version < 51) { // backward compatibility 2006 flags = JVM_ACC_STATIC; 2007 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2008 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2009 } 2010 } else { 2011 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2012 } 2013 2014 int args_size = -1; // only used when _need_verify is true 2015 if (_need_verify) { 2016 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2017 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2018 if (args_size > MAX_ARGS_SIZE) { 2019 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2020 } 2021 } 2022 2023 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2024 2025 // Default values for code and exceptions attribute elements 2026 u2 max_stack = 0; 2027 u2 max_locals = 0; 2028 u4 code_length = 0; 2029 u1* code_start = 0; 2030 u2 exception_table_length = 0; 2031 u2* exception_table_start = NULL; 2032 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2033 u2 checked_exceptions_length = 0; 2034 u2* checked_exceptions_start = NULL; 2035 CompressedLineNumberWriteStream* linenumber_table = NULL; 2036 int linenumber_table_length = 0; 2037 int total_lvt_length = 0; 2038 u2 lvt_cnt = 0; 2039 u2 lvtt_cnt = 0; 2040 bool lvt_allocated = false; 2041 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2042 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2043 u2* localvariable_table_length; 2044 u2** localvariable_table_start; 2045 u2* localvariable_type_table_length; 2046 u2** localvariable_type_table_start; 2047 u2 method_parameters_length = 0; 2048 u1* method_parameters_data = NULL; 2049 bool method_parameters_seen = false; 2050 bool parsed_code_attribute = false; 2051 bool parsed_checked_exceptions_attribute = false; 2052 bool parsed_stackmap_attribute = false; 2053 // stackmap attribute - JDK1.5 2054 u1* stackmap_data = NULL; 2055 int stackmap_data_length = 0; 2056 u2 generic_signature_index = 0; 2057 MethodAnnotationCollector parsed_annotations; 2058 u1* runtime_visible_annotations = NULL; 2059 int runtime_visible_annotations_length = 0; 2060 u1* runtime_invisible_annotations = NULL; 2061 int runtime_invisible_annotations_length = 0; 2062 u1* runtime_visible_parameter_annotations = NULL; 2063 int runtime_visible_parameter_annotations_length = 0; 2064 u1* runtime_invisible_parameter_annotations = NULL; 2065 int runtime_invisible_parameter_annotations_length = 0; 2066 u1* runtime_visible_type_annotations = NULL; 2067 int runtime_visible_type_annotations_length = 0; 2068 u1* runtime_invisible_type_annotations = NULL; 2069 int runtime_invisible_type_annotations_length = 0; 2070 u1* annotation_default = NULL; 2071 int annotation_default_length = 0; 2072 2073 // Parse code and exceptions attribute 2074 u2 method_attributes_count = cfs->get_u2_fast(); 2075 while (method_attributes_count--) { 2076 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2077 u2 method_attribute_name_index = cfs->get_u2_fast(); 2078 u4 method_attribute_length = cfs->get_u4_fast(); 2079 check_property( 2080 valid_symbol_at(method_attribute_name_index), 2081 "Invalid method attribute name index %u in class file %s", 2082 method_attribute_name_index, CHECK_(nullHandle)); 2083 2084 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2085 if (method_attribute_name == vmSymbols::tag_code()) { 2086 // Parse Code attribute 2087 if (_need_verify) { 2088 guarantee_property( 2089 !access_flags.is_native() && !access_flags.is_abstract(), 2090 "Code attribute in native or abstract methods in class file %s", 2091 CHECK_(nullHandle)); 2092 } 2093 if (parsed_code_attribute) { 2094 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2095 } 2096 parsed_code_attribute = true; 2097 2098 // Stack size, locals size, and code size 2099 if (_major_version == 45 && _minor_version <= 2) { 2100 cfs->guarantee_more(4, CHECK_(nullHandle)); 2101 max_stack = cfs->get_u1_fast(); 2102 max_locals = cfs->get_u1_fast(); 2103 code_length = cfs->get_u2_fast(); 2104 } else { 2105 cfs->guarantee_more(8, CHECK_(nullHandle)); 2106 max_stack = cfs->get_u2_fast(); 2107 max_locals = cfs->get_u2_fast(); 2108 code_length = cfs->get_u4_fast(); 2109 } 2110 if (_need_verify) { 2111 guarantee_property(args_size <= max_locals, 2112 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2113 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2114 "Invalid method Code length %u in class file %s", 2115 code_length, CHECK_(nullHandle)); 2116 } 2117 // Code pointer 2118 code_start = cfs->get_u1_buffer(); 2119 assert(code_start != NULL, "null code start"); 2120 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2121 cfs->skip_u1_fast(code_length); 2122 2123 // Exception handler table 2124 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2125 exception_table_length = cfs->get_u2_fast(); 2126 if (exception_table_length > 0) { 2127 exception_table_start = 2128 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2129 } 2130 2131 // Parse additional attributes in code attribute 2132 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2133 u2 code_attributes_count = cfs->get_u2_fast(); 2134 2135 unsigned int calculated_attribute_length = 0; 2136 2137 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2138 calculated_attribute_length = 2139 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2140 } else { 2141 // max_stack, locals and length are smaller in pre-version 45.2 classes 2142 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2143 } 2144 calculated_attribute_length += 2145 code_length + 2146 sizeof(exception_table_length) + 2147 sizeof(code_attributes_count) + 2148 exception_table_length * 2149 ( sizeof(u2) + // start_pc 2150 sizeof(u2) + // end_pc 2151 sizeof(u2) + // handler_pc 2152 sizeof(u2) ); // catch_type_index 2153 2154 while (code_attributes_count--) { 2155 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2156 u2 code_attribute_name_index = cfs->get_u2_fast(); 2157 u4 code_attribute_length = cfs->get_u4_fast(); 2158 calculated_attribute_length += code_attribute_length + 2159 sizeof(code_attribute_name_index) + 2160 sizeof(code_attribute_length); 2161 check_property(valid_symbol_at(code_attribute_name_index), 2162 "Invalid code attribute name index %u in class file %s", 2163 code_attribute_name_index, 2164 CHECK_(nullHandle)); 2165 if (LoadLineNumberTables && 2166 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2167 // Parse and compress line number table 2168 parse_linenumber_table(code_attribute_length, code_length, 2169 &linenumber_table, CHECK_(nullHandle)); 2170 2171 } else if (LoadLocalVariableTables && 2172 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2173 // Parse local variable table 2174 if (!lvt_allocated) { 2175 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2176 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2177 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2178 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2179 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2180 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2181 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2182 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2183 lvt_allocated = true; 2184 } 2185 if (lvt_cnt == max_lvt_cnt) { 2186 max_lvt_cnt <<= 1; 2187 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2188 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2189 } 2190 localvariable_table_start[lvt_cnt] = 2191 parse_localvariable_table(code_length, 2192 max_locals, 2193 code_attribute_length, 2194 &localvariable_table_length[lvt_cnt], 2195 false, // is not LVTT 2196 CHECK_(nullHandle)); 2197 total_lvt_length += localvariable_table_length[lvt_cnt]; 2198 lvt_cnt++; 2199 } else if (LoadLocalVariableTypeTables && 2200 _major_version >= JAVA_1_5_VERSION && 2201 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2202 if (!lvt_allocated) { 2203 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2204 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2205 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2206 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2207 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2208 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2209 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2210 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2211 lvt_allocated = true; 2212 } 2213 // Parse local variable type table 2214 if (lvtt_cnt == max_lvtt_cnt) { 2215 max_lvtt_cnt <<= 1; 2216 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2217 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2218 } 2219 localvariable_type_table_start[lvtt_cnt] = 2220 parse_localvariable_table(code_length, 2221 max_locals, 2222 code_attribute_length, 2223 &localvariable_type_table_length[lvtt_cnt], 2224 true, // is LVTT 2225 CHECK_(nullHandle)); 2226 lvtt_cnt++; 2227 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2228 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2229 // Stack map is only needed by the new verifier in JDK1.5. 2230 if (parsed_stackmap_attribute) { 2231 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2232 } 2233 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2234 stackmap_data_length = code_attribute_length; 2235 parsed_stackmap_attribute = true; 2236 } else { 2237 // Skip unknown attributes 2238 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2239 } 2240 } 2241 // check method attribute length 2242 if (_need_verify) { 2243 guarantee_property(method_attribute_length == calculated_attribute_length, 2244 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2245 } 2246 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2247 // Parse Exceptions attribute 2248 if (parsed_checked_exceptions_attribute) { 2249 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2250 } 2251 parsed_checked_exceptions_attribute = true; 2252 checked_exceptions_start = 2253 parse_checked_exceptions(&checked_exceptions_length, 2254 method_attribute_length, 2255 CHECK_(nullHandle)); 2256 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2257 // reject multiple method parameters 2258 if (method_parameters_seen) { 2259 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2260 } 2261 method_parameters_seen = true; 2262 method_parameters_length = cfs->get_u1_fast(); 2263 if (method_attribute_length != (method_parameters_length * 4u) + 1u) { 2264 classfile_parse_error( 2265 "Invalid MethodParameters method attribute length %u in class file", 2266 method_attribute_length, CHECK_(nullHandle)); 2267 } 2268 method_parameters_data = cfs->get_u1_buffer(); 2269 cfs->skip_u2_fast(method_parameters_length); 2270 cfs->skip_u2_fast(method_parameters_length); 2271 // ignore this attribute if it cannot be reflected 2272 if (!SystemDictionary::Parameter_klass_loaded()) 2273 method_parameters_length = 0; 2274 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2275 if (method_attribute_length != 0) { 2276 classfile_parse_error( 2277 "Invalid Synthetic method attribute length %u in class file %s", 2278 method_attribute_length, CHECK_(nullHandle)); 2279 } 2280 // Should we check that there hasn't already been a synthetic attribute? 2281 access_flags.set_is_synthetic(); 2282 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2283 if (method_attribute_length != 0) { 2284 classfile_parse_error( 2285 "Invalid Deprecated method attribute length %u in class file %s", 2286 method_attribute_length, CHECK_(nullHandle)); 2287 } 2288 } else if (_major_version >= JAVA_1_5_VERSION) { 2289 if (method_attribute_name == vmSymbols::tag_signature()) { 2290 if (method_attribute_length != 2) { 2291 classfile_parse_error( 2292 "Invalid Signature attribute length %u in class file %s", 2293 method_attribute_length, CHECK_(nullHandle)); 2294 } 2295 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 2296 generic_signature_index = cfs->get_u2_fast(); 2297 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2298 runtime_visible_annotations_length = method_attribute_length; 2299 runtime_visible_annotations = cfs->get_u1_buffer(); 2300 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2301 parse_annotations(runtime_visible_annotations, 2302 runtime_visible_annotations_length, &parsed_annotations, 2303 CHECK_(nullHandle)); 2304 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2305 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2306 runtime_invisible_annotations_length = method_attribute_length; 2307 runtime_invisible_annotations = cfs->get_u1_buffer(); 2308 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2309 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 2310 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2311 runtime_visible_parameter_annotations_length = method_attribute_length; 2312 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2313 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2314 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2315 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2316 runtime_invisible_parameter_annotations_length = method_attribute_length; 2317 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2318 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2319 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 2320 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2321 annotation_default_length = method_attribute_length; 2322 annotation_default = cfs->get_u1_buffer(); 2323 assert(annotation_default != NULL, "null annotation default"); 2324 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2325 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2326 runtime_visible_type_annotations_length = method_attribute_length; 2327 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2328 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2329 // No need for the VM to parse Type annotations 2330 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2331 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2332 runtime_invisible_type_annotations_length = method_attribute_length; 2333 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2334 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2335 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle)); 2336 } else { 2337 // Skip unknown attributes 2338 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2339 } 2340 } else { 2341 // Skip unknown attributes 2342 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2343 } 2344 } 2345 2346 if (linenumber_table != NULL) { 2347 linenumber_table->write_terminator(); 2348 linenumber_table_length = linenumber_table->position(); 2349 } 2350 2351 // Make sure there's at least one Code attribute in non-native/non-abstract method 2352 if (_need_verify) { 2353 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2354 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2355 } 2356 2357 // All sizing information for a Method* is finally available, now create it 2358 InlineTableSizes sizes( 2359 total_lvt_length, 2360 linenumber_table_length, 2361 exception_table_length, 2362 checked_exceptions_length, 2363 method_parameters_length, 2364 generic_signature_index, 2365 runtime_visible_annotations_length + 2366 runtime_invisible_annotations_length, 2367 runtime_visible_parameter_annotations_length + 2368 runtime_invisible_parameter_annotations_length, 2369 runtime_visible_type_annotations_length + 2370 runtime_invisible_type_annotations_length, 2371 annotation_default_length, 2372 0); 2373 2374 Method* m = Method::allocate( 2375 _loader_data, code_length, access_flags, &sizes, 2376 ConstMethod::NORMAL, CHECK_(nullHandle)); 2377 2378 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2379 2380 // Fill in information from fixed part (access_flags already set) 2381 m->set_constants(_cp); 2382 m->set_name_index(name_index); 2383 m->set_signature_index(signature_index); 2384 #ifdef CC_INTERP 2385 // hmm is there a gc issue here?? 2386 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2387 m->set_result_index(rtf.type()); 2388 #endif 2389 2390 if (args_size >= 0) { 2391 m->set_size_of_parameters(args_size); 2392 } else { 2393 m->compute_size_of_parameters(THREAD); 2394 } 2395 #ifdef ASSERT 2396 if (args_size >= 0) { 2397 m->compute_size_of_parameters(THREAD); 2398 assert(args_size == m->size_of_parameters(), ""); 2399 } 2400 #endif 2401 2402 // Fill in code attribute information 2403 m->set_max_stack(max_stack); 2404 m->set_max_locals(max_locals); 2405 if (stackmap_data != NULL) { 2406 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2407 stackmap_data_length, CHECK_NULL); 2408 } 2409 2410 // Copy byte codes 2411 m->set_code(code_start); 2412 2413 // Copy line number table 2414 if (linenumber_table != NULL) { 2415 memcpy(m->compressed_linenumber_table(), 2416 linenumber_table->buffer(), linenumber_table_length); 2417 } 2418 2419 // Copy exception table 2420 if (exception_table_length > 0) { 2421 int size = 2422 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2423 copy_u2_with_conversion((u2*) m->exception_table_start(), 2424 exception_table_start, size); 2425 } 2426 2427 // Copy method parameters 2428 if (method_parameters_length > 0) { 2429 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2430 for (int i = 0; i < method_parameters_length; i++) { 2431 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2432 method_parameters_data += 2; 2433 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2434 method_parameters_data += 2; 2435 } 2436 } 2437 2438 // Copy checked exceptions 2439 if (checked_exceptions_length > 0) { 2440 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2441 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2442 } 2443 2444 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2445 if (total_lvt_length > 0) { 2446 promoted_flags->set_has_localvariable_table(); 2447 copy_localvariable_table(m->constMethod(), lvt_cnt, 2448 localvariable_table_length, 2449 localvariable_table_start, 2450 lvtt_cnt, 2451 localvariable_type_table_length, 2452 localvariable_type_table_start, CHECK_NULL); 2453 } 2454 2455 if (parsed_annotations.has_any_annotations()) 2456 parsed_annotations.apply_to(m); 2457 2458 // Copy annotations 2459 copy_method_annotations(m->constMethod(), 2460 runtime_visible_annotations, 2461 runtime_visible_annotations_length, 2462 runtime_invisible_annotations, 2463 runtime_invisible_annotations_length, 2464 runtime_visible_parameter_annotations, 2465 runtime_visible_parameter_annotations_length, 2466 runtime_invisible_parameter_annotations, 2467 runtime_invisible_parameter_annotations_length, 2468 runtime_visible_type_annotations, 2469 runtime_visible_type_annotations_length, 2470 runtime_invisible_type_annotations, 2471 runtime_invisible_type_annotations_length, 2472 annotation_default, 2473 annotation_default_length, 2474 CHECK_NULL); 2475 2476 if (name == vmSymbols::finalize_method_name() && 2477 signature == vmSymbols::void_method_signature()) { 2478 if (m->is_empty_method()) { 2479 _has_empty_finalizer = true; 2480 } else { 2481 _has_finalizer = true; 2482 } 2483 } 2484 if (name == vmSymbols::object_initializer_name() && 2485 signature == vmSymbols::void_method_signature() && 2486 m->is_vanilla_constructor()) { 2487 _has_vanilla_constructor = true; 2488 } 2489 2490 NOT_PRODUCT(m->verify()); 2491 return m; 2492 } 2493 2494 2495 // The promoted_flags parameter is used to pass relevant access_flags 2496 // from the methods back up to the containing klass. These flag values 2497 // are added to klass's access_flags. 2498 2499 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2500 AccessFlags* promoted_flags, 2501 bool* has_final_method, 2502 bool* has_default_methods, 2503 TRAPS) { 2504 ClassFileStream* cfs = stream(); 2505 cfs->guarantee_more(2, CHECK_NULL); // length 2506 u2 length = cfs->get_u2_fast(); 2507 if (length == 0) { 2508 _methods = Universe::the_empty_method_array(); 2509 } else { 2510 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2511 2512 HandleMark hm(THREAD); 2513 for (int index = 0; index < length; index++) { 2514 methodHandle method = parse_method(is_interface, 2515 promoted_flags, 2516 CHECK_NULL); 2517 2518 if (method->is_final()) { 2519 *has_final_method = true; 2520 } 2521 if (is_interface && !method->is_abstract() && !method->is_static()) { 2522 // default method 2523 *has_default_methods = true; 2524 } 2525 _methods->at_put(index, method()); 2526 } 2527 2528 if (_need_verify && length > 1) { 2529 // Check duplicated methods 2530 ResourceMark rm(THREAD); 2531 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2532 THREAD, NameSigHash*, HASH_ROW_SIZE); 2533 initialize_hashtable(names_and_sigs); 2534 bool dup = false; 2535 { 2536 debug_only(No_Safepoint_Verifier nsv;) 2537 for (int i = 0; i < length; i++) { 2538 Method* m = _methods->at(i); 2539 // If no duplicates, add name/signature in hashtable names_and_sigs. 2540 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2541 dup = true; 2542 break; 2543 } 2544 } 2545 } 2546 if (dup) { 2547 classfile_parse_error("Duplicate method name&signature in class file %s", 2548 CHECK_NULL); 2549 } 2550 } 2551 } 2552 return _methods; 2553 } 2554 2555 2556 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2557 int length = methods->length(); 2558 // If JVMTI original method ordering or sharing is enabled we have to 2559 // remember the original class file ordering. 2560 // We temporarily use the vtable_index field in the Method* to store the 2561 // class file index, so we can read in after calling qsort. 2562 // Put the method ordering in the shared archive. 2563 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2564 for (int index = 0; index < length; index++) { 2565 Method* m = methods->at(index); 2566 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2567 m->set_vtable_index(index); 2568 } 2569 } 2570 // Sort method array by ascending method name (for faster lookups & vtable construction) 2571 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2572 Method::sort_methods(methods); 2573 2574 intArray* method_ordering = NULL; 2575 // If JVMTI original method ordering or sharing is enabled construct int 2576 // array remembering the original ordering 2577 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2578 method_ordering = new intArray(length); 2579 for (int index = 0; index < length; index++) { 2580 Method* m = methods->at(index); 2581 int old_index = m->vtable_index(); 2582 assert(old_index >= 0 && old_index < length, "invalid method index"); 2583 method_ordering->at_put(index, old_index); 2584 m->set_vtable_index(Method::invalid_vtable_index); 2585 } 2586 } 2587 return method_ordering; 2588 } 2589 2590 2591 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2592 ClassFileStream* cfs = stream(); 2593 cfs->guarantee_more(2, CHECK); // sourcefile_index 2594 u2 sourcefile_index = cfs->get_u2_fast(); 2595 check_property( 2596 valid_symbol_at(sourcefile_index), 2597 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2598 sourcefile_index, CHECK); 2599 set_class_sourcefile(_cp->symbol_at(sourcefile_index)); 2600 } 2601 2602 2603 2604 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2605 ClassFileStream* cfs = stream(); 2606 u1* sde_buffer = cfs->get_u1_buffer(); 2607 assert(sde_buffer != NULL, "null sde buffer"); 2608 2609 // Don't bother storing it if there is no way to retrieve it 2610 if (JvmtiExport::can_get_source_debug_extension()) { 2611 assert((length+1) > length, "Overflow checking"); 2612 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2613 for (int i = 0; i < length; i++) { 2614 sde[i] = sde_buffer[i]; 2615 } 2616 sde[length] = '\0'; 2617 set_class_sde_buffer((char*)sde, length); 2618 } 2619 // Got utf8 string, set stream position forward 2620 cfs->skip_u1(length, CHECK); 2621 } 2622 2623 2624 // Inner classes can be static, private or protected (classic VM does this) 2625 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2626 2627 // Return number of classes in the inner classes attribute table 2628 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2629 bool parsed_enclosingmethod_attribute, 2630 u2 enclosing_method_class_index, 2631 u2 enclosing_method_method_index, 2632 TRAPS) { 2633 ClassFileStream* cfs = stream(); 2634 u1* current_mark = cfs->current(); 2635 u2 length = 0; 2636 if (inner_classes_attribute_start != NULL) { 2637 cfs->set_current(inner_classes_attribute_start); 2638 cfs->guarantee_more(2, CHECK_0); // length 2639 length = cfs->get_u2_fast(); 2640 } 2641 2642 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2643 // method data: 2644 // [inner_class_info_index, 2645 // outer_class_info_index, 2646 // inner_name_index, 2647 // inner_class_access_flags, 2648 // ... 2649 // enclosing_method_class_index, 2650 // enclosing_method_method_index] 2651 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2652 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2653 _inner_classes = inner_classes; 2654 2655 int index = 0; 2656 int cp_size = _cp->length(); 2657 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2658 for (int n = 0; n < length; n++) { 2659 // Inner class index 2660 u2 inner_class_info_index = cfs->get_u2_fast(); 2661 check_property( 2662 inner_class_info_index == 0 || 2663 valid_klass_reference_at(inner_class_info_index), 2664 "inner_class_info_index %u has bad constant type in class file %s", 2665 inner_class_info_index, CHECK_0); 2666 // Outer class index 2667 u2 outer_class_info_index = cfs->get_u2_fast(); 2668 check_property( 2669 outer_class_info_index == 0 || 2670 valid_klass_reference_at(outer_class_info_index), 2671 "outer_class_info_index %u has bad constant type in class file %s", 2672 outer_class_info_index, CHECK_0); 2673 // Inner class name 2674 u2 inner_name_index = cfs->get_u2_fast(); 2675 check_property( 2676 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2677 "inner_name_index %u has bad constant type in class file %s", 2678 inner_name_index, CHECK_0); 2679 if (_need_verify) { 2680 guarantee_property(inner_class_info_index != outer_class_info_index, 2681 "Class is both outer and inner class in class file %s", CHECK_0); 2682 } 2683 // Access flags 2684 AccessFlags inner_access_flags; 2685 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2686 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2687 // Set abstract bit for old class files for backward compatibility 2688 flags |= JVM_ACC_ABSTRACT; 2689 } 2690 verify_legal_class_modifiers(flags, CHECK_0); 2691 inner_access_flags.set_flags(flags); 2692 2693 inner_classes->at_put(index++, inner_class_info_index); 2694 inner_classes->at_put(index++, outer_class_info_index); 2695 inner_classes->at_put(index++, inner_name_index); 2696 inner_classes->at_put(index++, inner_access_flags.as_short()); 2697 } 2698 2699 // 4347400: make sure there's no duplicate entry in the classes array 2700 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2701 for(int i = 0; i < length * 4; i += 4) { 2702 for(int j = i + 4; j < length * 4; j += 4) { 2703 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2704 inner_classes->at(i+1) != inner_classes->at(j+1) || 2705 inner_classes->at(i+2) != inner_classes->at(j+2) || 2706 inner_classes->at(i+3) != inner_classes->at(j+3)), 2707 "Duplicate entry in InnerClasses in class file %s", 2708 CHECK_0); 2709 } 2710 } 2711 } 2712 2713 // Set EnclosingMethod class and method indexes. 2714 if (parsed_enclosingmethod_attribute) { 2715 inner_classes->at_put(index++, enclosing_method_class_index); 2716 inner_classes->at_put(index++, enclosing_method_method_index); 2717 } 2718 assert(index == size, "wrong size"); 2719 2720 // Restore buffer's current position. 2721 cfs->set_current(current_mark); 2722 2723 return length; 2724 } 2725 2726 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2727 set_class_synthetic_flag(true); 2728 } 2729 2730 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2731 ClassFileStream* cfs = stream(); 2732 u2 signature_index = cfs->get_u2(CHECK); 2733 check_property( 2734 valid_symbol_at(signature_index), 2735 "Invalid constant pool index %u in Signature attribute in class file %s", 2736 signature_index, CHECK); 2737 set_class_generic_signature(_cp->symbol_at(signature_index)); 2738 } 2739 2740 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2741 ClassFileStream* cfs = stream(); 2742 u1* current_start = cfs->current(); 2743 2744 cfs->guarantee_more(2, CHECK); // length 2745 int attribute_array_length = cfs->get_u2_fast(); 2746 2747 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2748 "Short length on BootstrapMethods in class file %s", 2749 CHECK); 2750 2751 // The attribute contains a counted array of counted tuples of shorts, 2752 // represending bootstrap specifiers: 2753 // length*{bootstrap_method_index, argument_count*{argument_index}} 2754 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2755 // operand_count = number of shorts in attr, except for leading length 2756 2757 // The attribute is copied into a short[] array. 2758 // The array begins with a series of short[2] pairs, one for each tuple. 2759 int index_size = (attribute_array_length * 2); 2760 2761 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2762 2763 // Eagerly assign operands so they will be deallocated with the constant 2764 // pool if there is an error. 2765 _cp->set_operands(operands); 2766 2767 int operand_fill_index = index_size; 2768 int cp_size = _cp->length(); 2769 2770 for (int n = 0; n < attribute_array_length; n++) { 2771 // Store a 32-bit offset into the header of the operand array. 2772 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2773 2774 // Read a bootstrap specifier. 2775 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2776 u2 bootstrap_method_index = cfs->get_u2_fast(); 2777 u2 argument_count = cfs->get_u2_fast(); 2778 check_property( 2779 valid_cp_range(bootstrap_method_index, cp_size) && 2780 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2781 "bootstrap_method_index %u has bad constant type in class file %s", 2782 bootstrap_method_index, 2783 CHECK); 2784 operands->at_put(operand_fill_index++, bootstrap_method_index); 2785 operands->at_put(operand_fill_index++, argument_count); 2786 2787 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2788 for (int j = 0; j < argument_count; j++) { 2789 u2 argument_index = cfs->get_u2_fast(); 2790 check_property( 2791 valid_cp_range(argument_index, cp_size) && 2792 _cp->tag_at(argument_index).is_loadable_constant(), 2793 "argument_index %u has bad constant type in class file %s", 2794 argument_index, 2795 CHECK); 2796 operands->at_put(operand_fill_index++, argument_index); 2797 } 2798 } 2799 2800 assert(operand_fill_index == operands->length(), "exact fill"); 2801 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode"); 2802 2803 u1* current_end = cfs->current(); 2804 guarantee_property(current_end == current_start + attribute_byte_length, 2805 "Bad length on BootstrapMethods in class file %s", 2806 CHECK); 2807 } 2808 2809 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2810 TRAPS) { 2811 ClassFileStream* cfs = stream(); 2812 // Set inner classes attribute to default sentinel 2813 _inner_classes = Universe::the_empty_short_array(); 2814 cfs->guarantee_more(2, CHECK); // attributes_count 2815 u2 attributes_count = cfs->get_u2_fast(); 2816 bool parsed_sourcefile_attribute = false; 2817 bool parsed_innerclasses_attribute = false; 2818 bool parsed_enclosingmethod_attribute = false; 2819 bool parsed_bootstrap_methods_attribute = false; 2820 u1* runtime_visible_annotations = NULL; 2821 int runtime_visible_annotations_length = 0; 2822 u1* runtime_invisible_annotations = NULL; 2823 int runtime_invisible_annotations_length = 0; 2824 u1* runtime_visible_type_annotations = NULL; 2825 int runtime_visible_type_annotations_length = 0; 2826 u1* runtime_invisible_type_annotations = NULL; 2827 int runtime_invisible_type_annotations_length = 0; 2828 u1* inner_classes_attribute_start = NULL; 2829 u4 inner_classes_attribute_length = 0; 2830 u2 enclosing_method_class_index = 0; 2831 u2 enclosing_method_method_index = 0; 2832 // Iterate over attributes 2833 while (attributes_count--) { 2834 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2835 u2 attribute_name_index = cfs->get_u2_fast(); 2836 u4 attribute_length = cfs->get_u4_fast(); 2837 check_property( 2838 valid_symbol_at(attribute_name_index), 2839 "Attribute name has bad constant pool index %u in class file %s", 2840 attribute_name_index, CHECK); 2841 Symbol* tag = _cp->symbol_at(attribute_name_index); 2842 if (tag == vmSymbols::tag_source_file()) { 2843 // Check for SourceFile tag 2844 if (_need_verify) { 2845 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2846 } 2847 if (parsed_sourcefile_attribute) { 2848 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2849 } else { 2850 parsed_sourcefile_attribute = true; 2851 } 2852 parse_classfile_sourcefile_attribute(CHECK); 2853 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2854 // Check for SourceDebugExtension tag 2855 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2856 } else if (tag == vmSymbols::tag_inner_classes()) { 2857 // Check for InnerClasses tag 2858 if (parsed_innerclasses_attribute) { 2859 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2860 } else { 2861 parsed_innerclasses_attribute = true; 2862 } 2863 inner_classes_attribute_start = cfs->get_u1_buffer(); 2864 inner_classes_attribute_length = attribute_length; 2865 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2866 } else if (tag == vmSymbols::tag_synthetic()) { 2867 // Check for Synthetic tag 2868 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2869 if (attribute_length != 0) { 2870 classfile_parse_error( 2871 "Invalid Synthetic classfile attribute length %u in class file %s", 2872 attribute_length, CHECK); 2873 } 2874 parse_classfile_synthetic_attribute(CHECK); 2875 } else if (tag == vmSymbols::tag_deprecated()) { 2876 // Check for Deprecatd tag - 4276120 2877 if (attribute_length != 0) { 2878 classfile_parse_error( 2879 "Invalid Deprecated classfile attribute length %u in class file %s", 2880 attribute_length, CHECK); 2881 } 2882 } else if (_major_version >= JAVA_1_5_VERSION) { 2883 if (tag == vmSymbols::tag_signature()) { 2884 if (attribute_length != 2) { 2885 classfile_parse_error( 2886 "Wrong Signature attribute length %u in class file %s", 2887 attribute_length, CHECK); 2888 } 2889 parse_classfile_signature_attribute(CHECK); 2890 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2891 runtime_visible_annotations_length = attribute_length; 2892 runtime_visible_annotations = cfs->get_u1_buffer(); 2893 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2894 parse_annotations(runtime_visible_annotations, 2895 runtime_visible_annotations_length, 2896 parsed_annotations, 2897 CHECK); 2898 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2899 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2900 runtime_invisible_annotations_length = attribute_length; 2901 runtime_invisible_annotations = cfs->get_u1_buffer(); 2902 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2903 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2904 } else if (tag == vmSymbols::tag_enclosing_method()) { 2905 if (parsed_enclosingmethod_attribute) { 2906 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2907 } else { 2908 parsed_enclosingmethod_attribute = true; 2909 } 2910 cfs->guarantee_more(4, CHECK); // class_index, method_index 2911 enclosing_method_class_index = cfs->get_u2_fast(); 2912 enclosing_method_method_index = cfs->get_u2_fast(); 2913 if (enclosing_method_class_index == 0) { 2914 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2915 } 2916 // Validate the constant pool indices and types 2917 check_property(valid_klass_reference_at(enclosing_method_class_index), 2918 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2919 if (enclosing_method_method_index != 0 && 2920 (!_cp->is_within_bounds(enclosing_method_method_index) || 2921 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 2922 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2923 } 2924 } else if (tag == vmSymbols::tag_bootstrap_methods() && 2925 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 2926 if (parsed_bootstrap_methods_attribute) 2927 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 2928 parsed_bootstrap_methods_attribute = true; 2929 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 2930 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 2931 runtime_visible_type_annotations_length = attribute_length; 2932 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2933 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2934 // No need for the VM to parse Type annotations 2935 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 2936 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 2937 runtime_invisible_type_annotations_length = attribute_length; 2938 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2939 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2940 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK); 2941 } else { 2942 // Unknown attribute 2943 cfs->skip_u1(attribute_length, CHECK); 2944 } 2945 } else { 2946 // Unknown attribute 2947 cfs->skip_u1(attribute_length, CHECK); 2948 } 2949 } 2950 _annotations = assemble_annotations(runtime_visible_annotations, 2951 runtime_visible_annotations_length, 2952 runtime_invisible_annotations, 2953 runtime_invisible_annotations_length, 2954 CHECK); 2955 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 2956 runtime_visible_type_annotations_length, 2957 runtime_invisible_type_annotations, 2958 runtime_invisible_type_annotations_length, 2959 CHECK); 2960 2961 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 2962 u2 num_of_classes = parse_classfile_inner_classes_attribute( 2963 inner_classes_attribute_start, 2964 parsed_innerclasses_attribute, 2965 enclosing_method_class_index, 2966 enclosing_method_method_index, 2967 CHECK); 2968 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 2969 guarantee_property( 2970 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2971 "Wrong InnerClasses attribute length in class file %s", CHECK); 2972 } 2973 } 2974 2975 if (_max_bootstrap_specifier_index >= 0) { 2976 guarantee_property(parsed_bootstrap_methods_attribute, 2977 "Missing BootstrapMethods attribute in class file %s", CHECK); 2978 } 2979 } 2980 2981 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 2982 if (_synthetic_flag) 2983 k->set_is_synthetic(); 2984 if (_sourcefile != NULL) { 2985 _sourcefile->increment_refcount(); 2986 k->set_source_file_name(_sourcefile); 2987 } 2988 if (_generic_signature != NULL) { 2989 _generic_signature->increment_refcount(); 2990 k->set_generic_signature(_generic_signature); 2991 } 2992 if (_sde_buffer != NULL) { 2993 k->set_source_debug_extension(_sde_buffer, _sde_length); 2994 } 2995 } 2996 2997 // Transfer ownership of metadata allocated to the InstanceKlass. 2998 void ClassFileParser::apply_parsed_class_metadata( 2999 instanceKlassHandle this_klass, 3000 int java_fields_count, TRAPS) { 3001 // Assign annotations if needed 3002 if (_annotations != NULL || _type_annotations != NULL || 3003 _fields_annotations != NULL || _fields_type_annotations != NULL) { 3004 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 3005 annotations->set_class_annotations(_annotations); 3006 annotations->set_class_type_annotations(_type_annotations); 3007 annotations->set_fields_annotations(_fields_annotations); 3008 annotations->set_fields_type_annotations(_fields_type_annotations); 3009 this_klass->set_annotations(annotations); 3010 } 3011 3012 _cp->set_pool_holder(this_klass()); 3013 this_klass->set_constants(_cp); 3014 this_klass->set_fields(_fields, java_fields_count); 3015 this_klass->set_methods(_methods); 3016 this_klass->set_inner_classes(_inner_classes); 3017 this_klass->set_local_interfaces(_local_interfaces); 3018 this_klass->set_transitive_interfaces(_transitive_interfaces); 3019 3020 // Clear out these fields so they don't get deallocated by the destructor 3021 clear_class_metadata(); 3022 } 3023 3024 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3025 int runtime_visible_annotations_length, 3026 u1* runtime_invisible_annotations, 3027 int runtime_invisible_annotations_length, TRAPS) { 3028 AnnotationArray* annotations = NULL; 3029 if (runtime_visible_annotations != NULL || 3030 runtime_invisible_annotations != NULL) { 3031 annotations = MetadataFactory::new_array<u1>(_loader_data, 3032 runtime_visible_annotations_length + 3033 runtime_invisible_annotations_length, 3034 CHECK_(annotations)); 3035 if (runtime_visible_annotations != NULL) { 3036 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3037 annotations->at_put(i, runtime_visible_annotations[i]); 3038 } 3039 } 3040 if (runtime_invisible_annotations != NULL) { 3041 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3042 int append = runtime_visible_annotations_length+i; 3043 annotations->at_put(append, runtime_invisible_annotations[i]); 3044 } 3045 } 3046 } 3047 return annotations; 3048 } 3049 3050 3051 #ifdef ASSERT 3052 static void parseAndPrintGenericSignatures( 3053 instanceKlassHandle this_klass, TRAPS) { 3054 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise"); 3055 ResourceMark rm; 3056 3057 if (this_klass->generic_signature() != NULL) { 3058 using namespace generic; 3059 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK); 3060 3061 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string()); 3062 spec->print_on(tty); 3063 3064 for (int i = 0; i < this_klass->methods()->length(); ++i) { 3065 Method* m = this_klass->methods()->at(i); 3066 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec); 3067 Symbol* sig = m->generic_signature(); 3068 if (sig == NULL) { 3069 sig = m->signature(); 3070 } 3071 tty->print_cr("Parsing %s", sig->as_C_string()); 3072 method_spec->print_on(tty); 3073 } 3074 } 3075 } 3076 #endif // def ASSERT 3077 3078 3079 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3080 TRAPS) { 3081 instanceKlassHandle super_klass; 3082 if (super_class_index == 0) { 3083 check_property(_class_name == vmSymbols::java_lang_Object(), 3084 "Invalid superclass index %u in class file %s", 3085 super_class_index, 3086 CHECK_NULL); 3087 } else { 3088 check_property(valid_klass_reference_at(super_class_index), 3089 "Invalid superclass index %u in class file %s", 3090 super_class_index, 3091 CHECK_NULL); 3092 // The class name should be legal because it is checked when parsing constant pool. 3093 // However, make sure it is not an array type. 3094 bool is_array = false; 3095 if (_cp->tag_at(super_class_index).is_klass()) { 3096 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3097 if (_need_verify) 3098 is_array = super_klass->oop_is_array(); 3099 } else if (_need_verify) { 3100 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3101 } 3102 if (_need_verify) { 3103 guarantee_property(!is_array, 3104 "Bad superclass name in class file %s", CHECK_NULL); 3105 } 3106 } 3107 return super_klass; 3108 } 3109 3110 3111 // Values needed for oopmap and InstanceKlass creation 3112 class FieldLayoutInfo : public StackObj { 3113 public: 3114 int* nonstatic_oop_offsets; 3115 unsigned int* nonstatic_oop_counts; 3116 unsigned int nonstatic_oop_map_count; 3117 unsigned int total_oop_map_count; 3118 int instance_size; 3119 int nonstatic_field_size; 3120 int static_field_size; 3121 bool has_nonstatic_fields; 3122 }; 3123 3124 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3125 void ClassFileParser::layout_fields(Handle class_loader, 3126 FieldAllocationCount* fac, 3127 ClassAnnotationCollector* parsed_annotations, 3128 FieldLayoutInfo* info, 3129 TRAPS) { 3130 3131 // Field size and offset computation 3132 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3133 int next_static_oop_offset; 3134 int next_static_double_offset; 3135 int next_static_word_offset; 3136 int next_static_short_offset; 3137 int next_static_byte_offset; 3138 int next_nonstatic_oop_offset; 3139 int next_nonstatic_double_offset; 3140 int next_nonstatic_word_offset; 3141 int next_nonstatic_short_offset; 3142 int next_nonstatic_byte_offset; 3143 int first_nonstatic_oop_offset; 3144 int next_nonstatic_field_offset; 3145 int next_nonstatic_padded_offset; 3146 3147 // Count the contended fields by type. 3148 // 3149 // We ignore static fields, because @Contended is not supported for them. 3150 // The layout code below will also ignore the static fields. 3151 int nonstatic_contended_count = 0; 3152 FieldAllocationCount fac_contended; 3153 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3154 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3155 if (fs.is_contended()) { 3156 fac_contended.count[atype]++; 3157 if (!fs.access_flags().is_static()) { 3158 nonstatic_contended_count++; 3159 } 3160 } 3161 } 3162 3163 3164 // Calculate the starting byte offsets 3165 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3166 next_static_double_offset = next_static_oop_offset + 3167 ((fac->count[STATIC_OOP]) * heapOopSize); 3168 if ( fac->count[STATIC_DOUBLE] && 3169 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3170 Universe::field_type_should_be_aligned(T_LONG)) ) { 3171 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3172 } 3173 3174 next_static_word_offset = next_static_double_offset + 3175 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3176 next_static_short_offset = next_static_word_offset + 3177 ((fac->count[STATIC_WORD]) * BytesPerInt); 3178 next_static_byte_offset = next_static_short_offset + 3179 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3180 3181 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3182 nonstatic_field_size * heapOopSize; 3183 3184 next_nonstatic_field_offset = nonstatic_fields_start; 3185 3186 bool is_contended_class = parsed_annotations->is_contended(); 3187 3188 // Class is contended, pad before all the fields 3189 if (is_contended_class) { 3190 next_nonstatic_field_offset += ContendedPaddingWidth; 3191 } 3192 3193 // Compute the non-contended fields count. 3194 // The packing code below relies on these counts to determine if some field 3195 // can be squeezed into the alignment gap. Contended fields are obviously 3196 // exempt from that. 3197 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3198 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3199 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3200 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3201 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3202 3203 // Total non-static fields count, including every contended field 3204 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3205 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3206 fac->count[NONSTATIC_OOP]; 3207 3208 bool super_has_nonstatic_fields = 3209 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3210 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3211 3212 3213 // Prepare list of oops for oop map generation. 3214 // 3215 // "offset" and "count" lists are describing the set of contiguous oop 3216 // regions. offset[i] is the start of the i-th region, which then has 3217 // count[i] oops following. Before we know how many regions are required, 3218 // we pessimistically allocate the maps to fit all the oops into the 3219 // distinct regions. 3220 // 3221 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3222 // to figure out if we still need to do this. 3223 int* nonstatic_oop_offsets; 3224 unsigned int* nonstatic_oop_counts; 3225 unsigned int nonstatic_oop_map_count = 0; 3226 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3227 3228 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3229 THREAD, int, max_nonstatic_oop_maps); 3230 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3231 THREAD, unsigned int, max_nonstatic_oop_maps); 3232 3233 first_nonstatic_oop_offset = 0; // will be set for first oop field 3234 3235 bool compact_fields = CompactFields; 3236 int allocation_style = FieldsAllocationStyle; 3237 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3238 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3239 allocation_style = 1; // Optimistic 3240 } 3241 3242 // The next classes have predefined hard-coded fields offsets 3243 // (see in JavaClasses::compute_hard_coded_offsets()). 3244 // Use default fields allocation order for them. 3245 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3246 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3247 _class_name == vmSymbols::java_lang_Class() || 3248 _class_name == vmSymbols::java_lang_ClassLoader() || 3249 _class_name == vmSymbols::java_lang_ref_Reference() || 3250 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3251 _class_name == vmSymbols::java_lang_StackTraceElement() || 3252 _class_name == vmSymbols::java_lang_String() || 3253 _class_name == vmSymbols::java_lang_Throwable() || 3254 _class_name == vmSymbols::java_lang_Boolean() || 3255 _class_name == vmSymbols::java_lang_Character() || 3256 _class_name == vmSymbols::java_lang_Float() || 3257 _class_name == vmSymbols::java_lang_Double() || 3258 _class_name == vmSymbols::java_lang_Byte() || 3259 _class_name == vmSymbols::java_lang_Short() || 3260 _class_name == vmSymbols::java_lang_Integer() || 3261 _class_name == vmSymbols::java_lang_Long())) { 3262 allocation_style = 0; // Allocate oops first 3263 compact_fields = false; // Don't compact fields 3264 } 3265 3266 // Rearrange fields for a given allocation style 3267 if( allocation_style == 0 ) { 3268 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3269 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3270 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3271 (nonstatic_oop_count * heapOopSize); 3272 } else if( allocation_style == 1 ) { 3273 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3274 next_nonstatic_double_offset = next_nonstatic_field_offset; 3275 } else if( allocation_style == 2 ) { 3276 // Fields allocation: oops fields in super and sub classes are together. 3277 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3278 _super_klass->nonstatic_oop_map_size() > 0 ) { 3279 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3280 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3281 OopMapBlock* last_map = first_map + map_count - 1; 3282 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3283 if (next_offset == next_nonstatic_field_offset) { 3284 allocation_style = 0; // allocate oops first 3285 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3286 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3287 (nonstatic_oop_count * heapOopSize); 3288 } 3289 } 3290 if( allocation_style == 2 ) { 3291 allocation_style = 1; // allocate oops last 3292 next_nonstatic_double_offset = next_nonstatic_field_offset; 3293 } 3294 } else { 3295 ShouldNotReachHere(); 3296 } 3297 3298 int nonstatic_oop_space_count = 0; 3299 int nonstatic_word_space_count = 0; 3300 int nonstatic_short_space_count = 0; 3301 int nonstatic_byte_space_count = 0; 3302 int nonstatic_oop_space_offset; 3303 int nonstatic_word_space_offset; 3304 int nonstatic_short_space_offset; 3305 int nonstatic_byte_space_offset; 3306 3307 // Try to squeeze some of the fields into the gaps due to 3308 // long/double alignment. 3309 if( nonstatic_double_count > 0 ) { 3310 int offset = next_nonstatic_double_offset; 3311 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3312 if( compact_fields && offset != next_nonstatic_double_offset ) { 3313 // Allocate available fields into the gap before double field. 3314 int length = next_nonstatic_double_offset - offset; 3315 assert(length == BytesPerInt, ""); 3316 nonstatic_word_space_offset = offset; 3317 if( nonstatic_word_count > 0 ) { 3318 nonstatic_word_count -= 1; 3319 nonstatic_word_space_count = 1; // Only one will fit 3320 length -= BytesPerInt; 3321 offset += BytesPerInt; 3322 } 3323 nonstatic_short_space_offset = offset; 3324 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3325 nonstatic_short_count -= 1; 3326 nonstatic_short_space_count += 1; 3327 length -= BytesPerShort; 3328 offset += BytesPerShort; 3329 } 3330 nonstatic_byte_space_offset = offset; 3331 while( length > 0 && nonstatic_byte_count > 0 ) { 3332 nonstatic_byte_count -= 1; 3333 nonstatic_byte_space_count += 1; 3334 length -= 1; 3335 } 3336 // Allocate oop field in the gap if there are no other fields for that. 3337 nonstatic_oop_space_offset = offset; 3338 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3339 allocation_style != 0 ) { // when oop fields not first 3340 nonstatic_oop_count -= 1; 3341 nonstatic_oop_space_count = 1; // Only one will fit 3342 length -= heapOopSize; 3343 offset += heapOopSize; 3344 } 3345 } 3346 } 3347 3348 next_nonstatic_word_offset = next_nonstatic_double_offset + 3349 (nonstatic_double_count * BytesPerLong); 3350 next_nonstatic_short_offset = next_nonstatic_word_offset + 3351 (nonstatic_word_count * BytesPerInt); 3352 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3353 (nonstatic_short_count * BytesPerShort); 3354 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3355 nonstatic_byte_count; 3356 3357 // let oops jump before padding with this allocation style 3358 if( allocation_style == 1 ) { 3359 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3360 if( nonstatic_oop_count > 0 ) { 3361 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3362 } 3363 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3364 } 3365 3366 // Iterate over fields again and compute correct offsets. 3367 // The field allocation type was temporarily stored in the offset slot. 3368 // oop fields are located before non-oop fields (static and non-static). 3369 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3370 3371 // skip already laid out fields 3372 if (fs.is_offset_set()) continue; 3373 3374 // contended instance fields are handled below 3375 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3376 3377 int real_offset; 3378 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3379 3380 // pack the rest of the fields 3381 switch (atype) { 3382 case STATIC_OOP: 3383 real_offset = next_static_oop_offset; 3384 next_static_oop_offset += heapOopSize; 3385 break; 3386 case STATIC_BYTE: 3387 real_offset = next_static_byte_offset; 3388 next_static_byte_offset += 1; 3389 break; 3390 case STATIC_SHORT: 3391 real_offset = next_static_short_offset; 3392 next_static_short_offset += BytesPerShort; 3393 break; 3394 case STATIC_WORD: 3395 real_offset = next_static_word_offset; 3396 next_static_word_offset += BytesPerInt; 3397 break; 3398 case STATIC_DOUBLE: 3399 real_offset = next_static_double_offset; 3400 next_static_double_offset += BytesPerLong; 3401 break; 3402 case NONSTATIC_OOP: 3403 if( nonstatic_oop_space_count > 0 ) { 3404 real_offset = nonstatic_oop_space_offset; 3405 nonstatic_oop_space_offset += heapOopSize; 3406 nonstatic_oop_space_count -= 1; 3407 } else { 3408 real_offset = next_nonstatic_oop_offset; 3409 next_nonstatic_oop_offset += heapOopSize; 3410 } 3411 // Update oop maps 3412 if( nonstatic_oop_map_count > 0 && 3413 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3414 real_offset - 3415 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3416 heapOopSize ) { 3417 // Extend current oop map 3418 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3419 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3420 } else { 3421 // Create new oop map 3422 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3423 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3424 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3425 nonstatic_oop_map_count += 1; 3426 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3427 first_nonstatic_oop_offset = real_offset; 3428 } 3429 } 3430 break; 3431 case NONSTATIC_BYTE: 3432 if( nonstatic_byte_space_count > 0 ) { 3433 real_offset = nonstatic_byte_space_offset; 3434 nonstatic_byte_space_offset += 1; 3435 nonstatic_byte_space_count -= 1; 3436 } else { 3437 real_offset = next_nonstatic_byte_offset; 3438 next_nonstatic_byte_offset += 1; 3439 } 3440 break; 3441 case NONSTATIC_SHORT: 3442 if( nonstatic_short_space_count > 0 ) { 3443 real_offset = nonstatic_short_space_offset; 3444 nonstatic_short_space_offset += BytesPerShort; 3445 nonstatic_short_space_count -= 1; 3446 } else { 3447 real_offset = next_nonstatic_short_offset; 3448 next_nonstatic_short_offset += BytesPerShort; 3449 } 3450 break; 3451 case NONSTATIC_WORD: 3452 if( nonstatic_word_space_count > 0 ) { 3453 real_offset = nonstatic_word_space_offset; 3454 nonstatic_word_space_offset += BytesPerInt; 3455 nonstatic_word_space_count -= 1; 3456 } else { 3457 real_offset = next_nonstatic_word_offset; 3458 next_nonstatic_word_offset += BytesPerInt; 3459 } 3460 break; 3461 case NONSTATIC_DOUBLE: 3462 real_offset = next_nonstatic_double_offset; 3463 next_nonstatic_double_offset += BytesPerLong; 3464 break; 3465 default: 3466 ShouldNotReachHere(); 3467 } 3468 fs.set_offset(real_offset); 3469 } 3470 3471 3472 // Handle the contended cases. 3473 // 3474 // Each contended field should not intersect the cache line with another contended field. 3475 // In the absence of alignment information, we end up with pessimistically separating 3476 // the fields with full-width padding. 3477 // 3478 // Additionally, this should not break alignment for the fields, so we round the alignment up 3479 // for each field. 3480 if (nonstatic_contended_count > 0) { 3481 3482 // if there is at least one contended field, we need to have pre-padding for them 3483 next_nonstatic_padded_offset += ContendedPaddingWidth; 3484 3485 // collect all contended groups 3486 BitMap bm(_cp->size()); 3487 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3488 // skip already laid out fields 3489 if (fs.is_offset_set()) continue; 3490 3491 if (fs.is_contended()) { 3492 bm.set_bit(fs.contended_group()); 3493 } 3494 } 3495 3496 int current_group = -1; 3497 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3498 3499 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3500 3501 // skip already laid out fields 3502 if (fs.is_offset_set()) continue; 3503 3504 // skip non-contended fields and fields from different group 3505 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3506 3507 // handle statics below 3508 if (fs.access_flags().is_static()) continue; 3509 3510 int real_offset; 3511 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3512 3513 switch (atype) { 3514 case NONSTATIC_BYTE: 3515 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3516 real_offset = next_nonstatic_padded_offset; 3517 next_nonstatic_padded_offset += 1; 3518 break; 3519 3520 case NONSTATIC_SHORT: 3521 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3522 real_offset = next_nonstatic_padded_offset; 3523 next_nonstatic_padded_offset += BytesPerShort; 3524 break; 3525 3526 case NONSTATIC_WORD: 3527 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3528 real_offset = next_nonstatic_padded_offset; 3529 next_nonstatic_padded_offset += BytesPerInt; 3530 break; 3531 3532 case NONSTATIC_DOUBLE: 3533 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3534 real_offset = next_nonstatic_padded_offset; 3535 next_nonstatic_padded_offset += BytesPerLong; 3536 break; 3537 3538 case NONSTATIC_OOP: 3539 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3540 real_offset = next_nonstatic_padded_offset; 3541 next_nonstatic_padded_offset += heapOopSize; 3542 3543 // Create new oop map 3544 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3545 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3546 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3547 nonstatic_oop_map_count += 1; 3548 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3549 first_nonstatic_oop_offset = real_offset; 3550 } 3551 break; 3552 3553 default: 3554 ShouldNotReachHere(); 3555 } 3556 3557 if (fs.contended_group() == 0) { 3558 // Contended group defines the equivalence class over the fields: 3559 // the fields within the same contended group are not inter-padded. 3560 // The only exception is default group, which does not incur the 3561 // equivalence, and so requires intra-padding. 3562 next_nonstatic_padded_offset += ContendedPaddingWidth; 3563 } 3564 3565 fs.set_offset(real_offset); 3566 } // for 3567 3568 // Start laying out the next group. 3569 // Note that this will effectively pad the last group in the back; 3570 // this is expected to alleviate memory contention effects for 3571 // subclass fields and/or adjacent object. 3572 // If this was the default group, the padding is already in place. 3573 if (current_group != 0) { 3574 next_nonstatic_padded_offset += ContendedPaddingWidth; 3575 } 3576 } 3577 3578 // handle static fields 3579 } 3580 3581 // Entire class is contended, pad in the back. 3582 // This helps to alleviate memory contention effects for subclass fields 3583 // and/or adjacent object. 3584 if (is_contended_class) { 3585 next_nonstatic_padded_offset += ContendedPaddingWidth; 3586 } 3587 3588 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3589 3590 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3591 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3592 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3593 3594 int static_field_size = (static_fields_end - 3595 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3596 nonstatic_field_size = nonstatic_field_size + 3597 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3598 3599 int instance_size = align_object_size(instance_end / wordSize); 3600 3601 assert(instance_size == align_object_size(align_size_up( 3602 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3603 wordSize) / wordSize), "consistent layout helper value"); 3604 3605 // Invariant: nonstatic_field end/start should only change if there are 3606 // nonstatic fields in the class, or if the class is contended. We compare 3607 // against the non-aligned value, so that end alignment will not fail the 3608 // assert without actually having the fields. 3609 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3610 is_contended_class || 3611 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3612 3613 // Number of non-static oop map blocks allocated at end of klass. 3614 const unsigned int total_oop_map_count = 3615 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3616 first_nonstatic_oop_offset); 3617 3618 #ifndef PRODUCT 3619 if (PrintFieldLayout) { 3620 print_field_layout(_class_name, 3621 _fields, 3622 _cp, 3623 instance_size, 3624 nonstatic_fields_start, 3625 nonstatic_fields_end, 3626 static_fields_end); 3627 } 3628 3629 #endif 3630 // Pass back information needed for InstanceKlass creation 3631 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3632 info->nonstatic_oop_counts = nonstatic_oop_counts; 3633 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3634 info->total_oop_map_count = total_oop_map_count; 3635 info->instance_size = instance_size; 3636 info->static_field_size = static_field_size; 3637 info->nonstatic_field_size = nonstatic_field_size; 3638 info->has_nonstatic_fields = has_nonstatic_fields; 3639 } 3640 3641 3642 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3643 ClassLoaderData* loader_data, 3644 Handle protection_domain, 3645 KlassHandle host_klass, 3646 GrowableArray<Handle>* cp_patches, 3647 TempNewSymbol& parsed_name, 3648 bool verify, 3649 TRAPS) { 3650 3651 // When a retransformable agent is attached, JVMTI caches the 3652 // class bytes that existed before the first retransformation. 3653 // If RedefineClasses() was used before the retransformable 3654 // agent attached, then the cached class bytes may not be the 3655 // original class bytes. 3656 unsigned char *cached_class_file_bytes = NULL; 3657 jint cached_class_file_length; 3658 Handle class_loader(THREAD, loader_data->class_loader()); 3659 bool has_default_methods = false; 3660 ResourceMark rm(THREAD); 3661 3662 ClassFileStream* cfs = stream(); 3663 // Timing 3664 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3665 JavaThread* jt = (JavaThread*) THREAD; 3666 3667 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3668 ClassLoader::perf_class_parse_selftime(), 3669 NULL, 3670 jt->get_thread_stat()->perf_recursion_counts_addr(), 3671 jt->get_thread_stat()->perf_timers_addr(), 3672 PerfClassTraceTime::PARSE_CLASS); 3673 3674 init_parsed_class_attributes(loader_data); 3675 3676 if (JvmtiExport::should_post_class_file_load_hook()) { 3677 // Get the cached class file bytes (if any) from the class that 3678 // is being redefined or retransformed. We use jvmti_thread_state() 3679 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3680 // a JvmtiThreadState any earlier than necessary. This will help 3681 // avoid the bug described by 7126851. 3682 JvmtiThreadState *state = jt->jvmti_thread_state(); 3683 if (state != NULL) { 3684 KlassHandle *h_class_being_redefined = 3685 state->get_class_being_redefined(); 3686 if (h_class_being_redefined != NULL) { 3687 instanceKlassHandle ikh_class_being_redefined = 3688 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3689 cached_class_file_bytes = 3690 ikh_class_being_redefined->get_cached_class_file_bytes(); 3691 cached_class_file_length = 3692 ikh_class_being_redefined->get_cached_class_file_len(); 3693 } 3694 } 3695 3696 unsigned char* ptr = cfs->buffer(); 3697 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3698 3699 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3700 &ptr, &end_ptr, 3701 &cached_class_file_bytes, 3702 &cached_class_file_length); 3703 3704 if (ptr != cfs->buffer()) { 3705 // JVMTI agent has modified class file data. 3706 // Set new class file stream using JVMTI agent modified 3707 // class file data. 3708 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3709 set_stream(cfs); 3710 } 3711 } 3712 3713 _host_klass = host_klass; 3714 _cp_patches = cp_patches; 3715 3716 instanceKlassHandle nullHandle; 3717 3718 // Figure out whether we can skip format checking (matching classic VM behavior) 3719 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3720 3721 // Set the verify flag in stream 3722 cfs->set_verify(_need_verify); 3723 3724 // Save the class file name for easier error message printing. 3725 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3726 3727 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3728 // Magic value 3729 u4 magic = cfs->get_u4_fast(); 3730 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3731 "Incompatible magic value %u in class file %s", 3732 magic, CHECK_(nullHandle)); 3733 3734 // Version numbers 3735 u2 minor_version = cfs->get_u2_fast(); 3736 u2 major_version = cfs->get_u2_fast(); 3737 3738 // Check version numbers - we check this even with verifier off 3739 if (!is_supported_version(major_version, minor_version)) { 3740 if (name == NULL) { 3741 Exceptions::fthrow( 3742 THREAD_AND_LOCATION, 3743 vmSymbols::java_lang_UnsupportedClassVersionError(), 3744 "Unsupported major.minor version %u.%u", 3745 major_version, 3746 minor_version); 3747 } else { 3748 ResourceMark rm(THREAD); 3749 Exceptions::fthrow( 3750 THREAD_AND_LOCATION, 3751 vmSymbols::java_lang_UnsupportedClassVersionError(), 3752 "%s : Unsupported major.minor version %u.%u", 3753 name->as_C_string(), 3754 major_version, 3755 minor_version); 3756 } 3757 return nullHandle; 3758 } 3759 3760 _major_version = major_version; 3761 _minor_version = minor_version; 3762 3763 3764 // Check if verification needs to be relaxed for this class file 3765 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3766 _relax_verify = Verifier::relax_verify_for(class_loader()); 3767 3768 // Constant pool 3769 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3770 3771 int cp_size = cp->length(); 3772 3773 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3774 3775 // Access flags 3776 AccessFlags access_flags; 3777 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3778 3779 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3780 // Set abstract bit for old class files for backward compatibility 3781 flags |= JVM_ACC_ABSTRACT; 3782 } 3783 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3784 access_flags.set_flags(flags); 3785 3786 // This class and superclass 3787 u2 this_class_index = cfs->get_u2_fast(); 3788 check_property( 3789 valid_cp_range(this_class_index, cp_size) && 3790 cp->tag_at(this_class_index).is_unresolved_klass(), 3791 "Invalid this class index %u in constant pool in class file %s", 3792 this_class_index, CHECK_(nullHandle)); 3793 3794 Symbol* class_name = cp->unresolved_klass_at(this_class_index); 3795 assert(class_name != NULL, "class_name can't be null"); 3796 3797 // It's important to set parsed_name *before* resolving the super class. 3798 // (it's used for cleanup by the caller if parsing fails) 3799 parsed_name = class_name; 3800 // parsed_name is returned and can be used if there's an error, so add to 3801 // its reference count. Caller will decrement the refcount. 3802 parsed_name->increment_refcount(); 3803 3804 // Update _class_name which could be null previously to be class_name 3805 _class_name = class_name; 3806 3807 // Don't need to check whether this class name is legal or not. 3808 // It has been checked when constant pool is parsed. 3809 // However, make sure it is not an array type. 3810 if (_need_verify) { 3811 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3812 "Bad class name in class file %s", 3813 CHECK_(nullHandle)); 3814 } 3815 3816 Klass* preserve_this_klass; // for storing result across HandleMark 3817 3818 // release all handles when parsing is done 3819 { HandleMark hm(THREAD); 3820 3821 // Checks if name in class file matches requested name 3822 if (name != NULL && class_name != name) { 3823 ResourceMark rm(THREAD); 3824 Exceptions::fthrow( 3825 THREAD_AND_LOCATION, 3826 vmSymbols::java_lang_NoClassDefFoundError(), 3827 "%s (wrong name: %s)", 3828 name->as_C_string(), 3829 class_name->as_C_string() 3830 ); 3831 return nullHandle; 3832 } 3833 3834 if (TraceClassLoadingPreorder) { 3835 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3836 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3837 tty->print_cr("]"); 3838 } 3839 3840 u2 super_class_index = cfs->get_u2_fast(); 3841 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3842 CHECK_NULL); 3843 3844 // Interfaces 3845 u2 itfs_len = cfs->get_u2_fast(); 3846 Array<Klass*>* local_interfaces = 3847 parse_interfaces(itfs_len, protection_domain, _class_name, 3848 &has_default_methods, CHECK_(nullHandle)); 3849 3850 u2 java_fields_count = 0; 3851 // Fields (offsets are filled in later) 3852 FieldAllocationCount fac; 3853 Array<u2>* fields = parse_fields(class_name, 3854 access_flags.is_interface(), 3855 &fac, &java_fields_count, 3856 CHECK_(nullHandle)); 3857 // Methods 3858 bool has_final_method = false; 3859 AccessFlags promoted_flags; 3860 promoted_flags.set_flags(0); 3861 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 3862 &promoted_flags, 3863 &has_final_method, 3864 &has_default_methods, 3865 CHECK_(nullHandle)); 3866 3867 // Additional attributes 3868 ClassAnnotationCollector parsed_annotations; 3869 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 3870 3871 // Make sure this is the end of class file stream 3872 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3873 3874 // We check super class after class file is parsed and format is checked 3875 if (super_class_index > 0 && super_klass.is_null()) { 3876 Symbol* sk = cp->klass_name_at(super_class_index); 3877 if (access_flags.is_interface()) { 3878 // Before attempting to resolve the superclass, check for class format 3879 // errors not checked yet. 3880 guarantee_property(sk == vmSymbols::java_lang_Object(), 3881 "Interfaces must have java.lang.Object as superclass in class file %s", 3882 CHECK_(nullHandle)); 3883 } 3884 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 3885 class_loader, 3886 protection_domain, 3887 true, 3888 CHECK_(nullHandle)); 3889 3890 KlassHandle kh (THREAD, k); 3891 super_klass = instanceKlassHandle(THREAD, kh()); 3892 } 3893 if (super_klass.not_null()) { 3894 3895 if (super_klass->has_default_methods()) { 3896 has_default_methods = true; 3897 } 3898 3899 if (super_klass->is_interface()) { 3900 ResourceMark rm(THREAD); 3901 Exceptions::fthrow( 3902 THREAD_AND_LOCATION, 3903 vmSymbols::java_lang_IncompatibleClassChangeError(), 3904 "class %s has interface %s as super class", 3905 class_name->as_klass_external_name(), 3906 super_klass->external_name() 3907 ); 3908 return nullHandle; 3909 } 3910 // Make sure super class is not final 3911 if (super_klass->is_final()) { 3912 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 3913 } 3914 } 3915 3916 // save super klass for error handling. 3917 _super_klass = super_klass; 3918 3919 // Compute the transitive list of all unique interfaces implemented by this class 3920 _transitive_interfaces = 3921 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 3922 3923 // sort methods 3924 intArray* method_ordering = sort_methods(methods); 3925 3926 // promote flags from parse_methods() to the klass' flags 3927 access_flags.add_promoted_flags(promoted_flags.as_int()); 3928 3929 // Size of Java vtable (in words) 3930 int vtable_size = 0; 3931 int itable_size = 0; 3932 int num_miranda_methods = 0; 3933 3934 GrowableArray<Method*> all_mirandas(20); 3935 3936 klassVtable::compute_vtable_size_and_num_mirandas( 3937 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 3938 access_flags, class_loader, class_name, local_interfaces, 3939 CHECK_(nullHandle)); 3940 3941 // Size of Java itable (in words) 3942 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 3943 3944 FieldLayoutInfo info; 3945 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 3946 3947 int total_oop_map_size2 = 3948 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 3949 3950 // Compute reference type 3951 ReferenceType rt; 3952 if (super_klass() == NULL) { 3953 rt = REF_NONE; 3954 } else { 3955 rt = super_klass->reference_type(); 3956 } 3957 3958 // We can now create the basic Klass* for this klass 3959 _klass = InstanceKlass::allocate_instance_klass(loader_data, 3960 vtable_size, 3961 itable_size, 3962 info.static_field_size, 3963 total_oop_map_size2, 3964 rt, 3965 access_flags, 3966 name, 3967 super_klass(), 3968 !host_klass.is_null(), 3969 CHECK_(nullHandle)); 3970 instanceKlassHandle this_klass (THREAD, _klass); 3971 3972 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 3973 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 3974 "sanity"); 3975 3976 // Fill in information already parsed 3977 this_klass->set_should_verify_class(verify); 3978 jint lh = Klass::instance_layout_helper(info.instance_size, false); 3979 this_klass->set_layout_helper(lh); 3980 assert(this_klass->oop_is_instance(), "layout is correct"); 3981 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 3982 // Not yet: supers are done below to support the new subtype-checking fields 3983 //this_klass->set_super(super_klass()); 3984 this_klass->set_class_loader_data(loader_data); 3985 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 3986 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 3987 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 3988 3989 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 3990 3991 if (has_final_method) { 3992 this_klass->set_has_final_method(); 3993 } 3994 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 3995 // The InstanceKlass::_methods_jmethod_ids cache and the 3996 // InstanceKlass::_methods_cached_itable_indices cache are 3997 // both managed on the assumption that the initial cache 3998 // size is equal to the number of methods in the class. If 3999 // that changes, then InstanceKlass::idnum_can_increment() 4000 // has to be changed accordingly. 4001 this_klass->set_initial_method_idnum(methods->length()); 4002 this_klass->set_name(cp->klass_name_at(this_class_index)); 4003 if (is_anonymous()) // I am well known to myself 4004 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 4005 4006 this_klass->set_minor_version(minor_version); 4007 this_klass->set_major_version(major_version); 4008 this_klass->set_has_default_methods(has_default_methods); 4009 4010 // Set up Method*::intrinsic_id as soon as we know the names of methods. 4011 // (We used to do this lazily, but now we query it in Rewriter, 4012 // which is eagerly done for every method, so we might as well do it now, 4013 // when everything is fresh in memory.) 4014 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { 4015 for (int j = 0; j < methods->length(); j++) { 4016 methods->at(j)->init_intrinsic_id(); 4017 } 4018 } 4019 4020 if (cached_class_file_bytes != NULL) { 4021 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4022 this_klass->set_cached_class_file(cached_class_file_bytes, 4023 cached_class_file_length); 4024 } 4025 4026 // Fill in field values obtained by parse_classfile_attributes 4027 if (parsed_annotations.has_any_annotations()) 4028 parsed_annotations.apply_to(this_klass); 4029 apply_parsed_class_attributes(this_klass); 4030 4031 // Miranda methods 4032 if ((num_miranda_methods > 0) || 4033 // if this class introduced new miranda methods or 4034 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4035 // super class exists and this class inherited miranda methods 4036 ) { 4037 this_klass->set_has_miranda_methods(); // then set a flag 4038 } 4039 4040 // Fill in information needed to compute superclasses. 4041 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4042 4043 // Initialize itable offset tables 4044 klassItable::setup_itable_offset_table(this_klass); 4045 4046 // Compute transitive closure of interfaces this class implements 4047 // Do final class setup 4048 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4049 4050 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4051 set_precomputed_flags(this_klass); 4052 4053 // reinitialize modifiers, using the InnerClasses attribute 4054 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4055 this_klass->set_modifier_flags(computed_modifiers); 4056 4057 // check if this class can access its super class 4058 check_super_class_access(this_klass, CHECK_(nullHandle)); 4059 4060 // check if this class can access its superinterfaces 4061 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4062 4063 // check if this class overrides any final method 4064 check_final_method_override(this_klass, CHECK_(nullHandle)); 4065 4066 // check that if this class is an interface then it doesn't have static methods 4067 if (this_klass->is_interface()) { 4068 /* An interface in a JAVA 8 classfile can be static */ 4069 if (_major_version < JAVA_8_VERSION) { 4070 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4071 } 4072 } 4073 4074 // Allocate mirror and initialize static fields 4075 java_lang_Class::create_mirror(this_klass, protection_domain, CHECK_(nullHandle)); 4076 4077 4078 #ifdef ASSERT 4079 if (ParseAllGenericSignatures) { 4080 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle)); 4081 } 4082 #endif 4083 4084 // Generate any default methods - default methods are interface methods 4085 // that have a default implementation. This is new with Lambda project. 4086 if (has_default_methods && !access_flags.is_interface() && 4087 local_interfaces->length() > 0) { 4088 DefaultMethods::generate_default_methods( 4089 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4090 } 4091 4092 // Update the loader_data graph. 4093 record_defined_class_dependencies(this_klass, CHECK_NULL); 4094 4095 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4096 false /* not shared class */); 4097 4098 if (TraceClassLoading) { 4099 ResourceMark rm; 4100 // print in a single call to reduce interleaving of output 4101 if (cfs->source() != NULL) { 4102 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4103 cfs->source()); 4104 } else if (class_loader.is_null()) { 4105 if (THREAD->is_Java_thread()) { 4106 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 4107 tty->print("[Loaded %s by instance of %s]\n", 4108 this_klass->external_name(), 4109 InstanceKlass::cast(caller)->external_name()); 4110 } else { 4111 tty->print("[Loaded %s]\n", this_klass->external_name()); 4112 } 4113 } else { 4114 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4115 InstanceKlass::cast(class_loader->klass())->external_name()); 4116 } 4117 } 4118 4119 if (TraceClassResolution) { 4120 ResourceMark rm; 4121 // print out the superclass. 4122 const char * from = this_klass()->external_name(); 4123 if (this_klass->java_super() != NULL) { 4124 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4125 } 4126 // print out each of the interface classes referred to by this class. 4127 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4128 if (local_interfaces != NULL) { 4129 int length = local_interfaces->length(); 4130 for (int i = 0; i < length; i++) { 4131 Klass* k = local_interfaces->at(i); 4132 InstanceKlass* to_class = InstanceKlass::cast(k); 4133 const char * to = to_class->external_name(); 4134 tty->print("RESOLVE %s %s (interface)\n", from, to); 4135 } 4136 } 4137 } 4138 4139 // preserve result across HandleMark 4140 preserve_this_klass = this_klass(); 4141 } 4142 4143 // Create new handle outside HandleMark (might be needed for 4144 // Extended Class Redefinition) 4145 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4146 debug_only(this_klass->verify();) 4147 4148 // Clear class if no error has occurred so destructor doesn't deallocate it 4149 _klass = NULL; 4150 return this_klass; 4151 } 4152 4153 // Destructor to clean up if there's an error 4154 ClassFileParser::~ClassFileParser() { 4155 MetadataFactory::free_metadata(_loader_data, _cp); 4156 MetadataFactory::free_array<u2>(_loader_data, _fields); 4157 4158 // Free methods 4159 InstanceKlass::deallocate_methods(_loader_data, _methods); 4160 4161 // beware of the Universe::empty_blah_array!! 4162 if (_inner_classes != Universe::the_empty_short_array()) { 4163 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4164 } 4165 4166 // Free interfaces 4167 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4168 _local_interfaces, _transitive_interfaces); 4169 4170 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4171 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4172 Annotations::free_contents(_loader_data, _fields_annotations); 4173 Annotations::free_contents(_loader_data, _fields_type_annotations); 4174 4175 clear_class_metadata(); 4176 4177 // deallocate the klass if already created. 4178 MetadataFactory::free_metadata(_loader_data, _klass); 4179 _klass = NULL; 4180 } 4181 4182 void ClassFileParser::print_field_layout(Symbol* name, 4183 Array<u2>* fields, 4184 constantPoolHandle cp, 4185 int instance_size, 4186 int instance_fields_start, 4187 int instance_fields_end, 4188 int static_fields_end) { 4189 tty->print("%s: field layout\n", name->as_klass_external_name()); 4190 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4191 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4192 if (!fs.access_flags().is_static()) { 4193 tty->print(" @%3d \"%s\" %s\n", 4194 fs.offset(), 4195 fs.name()->as_klass_external_name(), 4196 fs.signature()->as_klass_external_name()); 4197 } 4198 } 4199 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4200 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4201 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4202 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4203 if (fs.access_flags().is_static()) { 4204 tty->print(" @%3d \"%s\" %s\n", 4205 fs.offset(), 4206 fs.name()->as_klass_external_name(), 4207 fs.signature()->as_klass_external_name()); 4208 } 4209 } 4210 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4211 tty->print("\n"); 4212 } 4213 4214 unsigned int 4215 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4216 unsigned int nonstatic_oop_map_count, 4217 int first_nonstatic_oop_offset) { 4218 unsigned int map_count = 4219 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4220 if (nonstatic_oop_map_count > 0) { 4221 // We have oops to add to map 4222 if (map_count == 0) { 4223 map_count = nonstatic_oop_map_count; 4224 } else { 4225 // Check whether we should add a new map block or whether the last one can 4226 // be extended 4227 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4228 OopMapBlock* const last_map = first_map + map_count - 1; 4229 4230 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4231 if (next_offset == first_nonstatic_oop_offset) { 4232 // There is no gap bettwen superklass's last oop field and first 4233 // local oop field, merge maps. 4234 nonstatic_oop_map_count -= 1; 4235 } else { 4236 // Superklass didn't end with a oop field, add extra maps 4237 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4238 } 4239 map_count += nonstatic_oop_map_count; 4240 } 4241 } 4242 return map_count; 4243 } 4244 4245 4246 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4247 unsigned int nonstatic_oop_map_count, 4248 int* nonstatic_oop_offsets, 4249 unsigned int* nonstatic_oop_counts) { 4250 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4251 const InstanceKlass* const super = k->superklass(); 4252 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4253 if (super_count > 0) { 4254 // Copy maps from superklass 4255 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4256 for (unsigned int i = 0; i < super_count; ++i) { 4257 *this_oop_map++ = *super_oop_map++; 4258 } 4259 } 4260 4261 if (nonstatic_oop_map_count > 0) { 4262 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4263 // The counts differ because there is no gap between superklass's last oop 4264 // field and the first local oop field. Extend the last oop map copied 4265 // from the superklass instead of creating new one. 4266 nonstatic_oop_map_count--; 4267 nonstatic_oop_offsets++; 4268 this_oop_map--; 4269 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4270 this_oop_map++; 4271 } 4272 4273 // Add new map blocks, fill them 4274 while (nonstatic_oop_map_count-- > 0) { 4275 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4276 this_oop_map->set_count(*nonstatic_oop_counts++); 4277 this_oop_map++; 4278 } 4279 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4280 this_oop_map, "sanity"); 4281 } 4282 } 4283 4284 4285 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4286 Klass* super = k->super(); 4287 4288 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4289 // in which case we don't have to register objects as finalizable 4290 if (!_has_empty_finalizer) { 4291 if (_has_finalizer || 4292 (super != NULL && super->has_finalizer())) { 4293 k->set_has_finalizer(); 4294 } 4295 } 4296 4297 #ifdef ASSERT 4298 bool f = false; 4299 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4300 vmSymbols::void_method_signature()); 4301 if (m != NULL && !m->is_empty_method()) { 4302 f = true; 4303 } 4304 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4305 #endif 4306 4307 // Check if this klass supports the java.lang.Cloneable interface 4308 if (SystemDictionary::Cloneable_klass_loaded()) { 4309 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4310 k->set_is_cloneable(); 4311 } 4312 } 4313 4314 // Check if this klass has a vanilla default constructor 4315 if (super == NULL) { 4316 // java.lang.Object has empty default constructor 4317 k->set_has_vanilla_constructor(); 4318 } else { 4319 if (super->has_vanilla_constructor() && 4320 _has_vanilla_constructor) { 4321 k->set_has_vanilla_constructor(); 4322 } 4323 #ifdef ASSERT 4324 bool v = false; 4325 if (super->has_vanilla_constructor()) { 4326 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4327 ), vmSymbols::void_method_signature()); 4328 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4329 v = true; 4330 } 4331 } 4332 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4333 #endif 4334 } 4335 4336 // If it cannot be fast-path allocated, set a bit in the layout helper. 4337 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4338 assert(k->size_helper() > 0, "layout_helper is initialized"); 4339 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4340 || k->is_abstract() || k->is_interface() 4341 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4342 || k->size_helper() >= FastAllocateSizeLimit) { 4343 // Forbid fast-path allocation. 4344 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4345 k->set_layout_helper(lh); 4346 } 4347 } 4348 4349 // Attach super classes and interface classes to class loader data 4350 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4351 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4352 if (defining_loader_data->is_the_null_class_loader_data()) { 4353 // Dependencies to null class loader data are implicit. 4354 return; 4355 } else { 4356 // add super class dependency 4357 Klass* super = defined_klass->super(); 4358 if (super != NULL) { 4359 defining_loader_data->record_dependency(super, CHECK); 4360 } 4361 4362 // add super interface dependencies 4363 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4364 if (local_interfaces != NULL) { 4365 int length = local_interfaces->length(); 4366 for (int i = 0; i < length; i++) { 4367 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4368 } 4369 } 4370 } 4371 } 4372 4373 // utility methods for appending an array with check for duplicates 4374 4375 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4376 // iterate over new interfaces 4377 for (int i = 0; i < ifs->length(); i++) { 4378 Klass* e = ifs->at(i); 4379 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4380 // add new interface 4381 result->append_if_missing(e); 4382 } 4383 } 4384 4385 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4386 instanceKlassHandle super, 4387 Array<Klass*>* local_ifs, TRAPS) { 4388 // Compute maximum size for transitive interfaces 4389 int max_transitive_size = 0; 4390 int super_size = 0; 4391 // Add superclass transitive interfaces size 4392 if (super.not_null()) { 4393 super_size = super->transitive_interfaces()->length(); 4394 max_transitive_size += super_size; 4395 } 4396 // Add local interfaces' super interfaces 4397 int local_size = local_ifs->length(); 4398 for (int i = 0; i < local_size; i++) { 4399 Klass* l = local_ifs->at(i); 4400 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4401 } 4402 // Finally add local interfaces 4403 max_transitive_size += local_size; 4404 // Construct array 4405 if (max_transitive_size == 0) { 4406 // no interfaces, use canonicalized array 4407 return Universe::the_empty_klass_array(); 4408 } else if (max_transitive_size == super_size) { 4409 // no new local interfaces added, share superklass' transitive interface array 4410 return super->transitive_interfaces(); 4411 } else if (max_transitive_size == local_size) { 4412 // only local interfaces added, share local interface array 4413 return local_ifs; 4414 } else { 4415 ResourceMark rm; 4416 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4417 4418 // Copy down from superclass 4419 if (super.not_null()) { 4420 append_interfaces(result, super->transitive_interfaces()); 4421 } 4422 4423 // Copy down from local interfaces' superinterfaces 4424 for (int i = 0; i < local_ifs->length(); i++) { 4425 Klass* l = local_ifs->at(i); 4426 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4427 } 4428 // Finally add local interfaces 4429 append_interfaces(result, local_ifs); 4430 4431 // length will be less than the max_transitive_size if duplicates were removed 4432 int length = result->length(); 4433 assert(length <= max_transitive_size, "just checking"); 4434 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4435 for (int i = 0; i < length; i++) { 4436 Klass* e = result->at(i); 4437 assert(e != NULL, "just checking"); 4438 new_result->at_put(i, e); 4439 } 4440 return new_result; 4441 } 4442 } 4443 4444 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4445 Klass* super = this_klass->super(); 4446 if ((super != NULL) && 4447 (!Reflection::verify_class_access(this_klass(), super, false))) { 4448 ResourceMark rm(THREAD); 4449 Exceptions::fthrow( 4450 THREAD_AND_LOCATION, 4451 vmSymbols::java_lang_IllegalAccessError(), 4452 "class %s cannot access its superclass %s", 4453 this_klass->external_name(), 4454 InstanceKlass::cast(super)->external_name() 4455 ); 4456 return; 4457 } 4458 } 4459 4460 4461 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4462 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4463 int lng = local_interfaces->length(); 4464 for (int i = lng - 1; i >= 0; i--) { 4465 Klass* k = local_interfaces->at(i); 4466 assert (k != NULL && k->is_interface(), "invalid interface"); 4467 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4468 ResourceMark rm(THREAD); 4469 Exceptions::fthrow( 4470 THREAD_AND_LOCATION, 4471 vmSymbols::java_lang_IllegalAccessError(), 4472 "class %s cannot access its superinterface %s", 4473 this_klass->external_name(), 4474 InstanceKlass::cast(k)->external_name() 4475 ); 4476 return; 4477 } 4478 } 4479 } 4480 4481 4482 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4483 Array<Method*>* methods = this_klass->methods(); 4484 int num_methods = methods->length(); 4485 4486 // go thru each method and check if it overrides a final method 4487 for (int index = 0; index < num_methods; index++) { 4488 Method* m = methods->at(index); 4489 4490 // skip private, static and <init> methods 4491 if ((!m->is_private()) && 4492 (!m->is_static()) && 4493 (m->name() != vmSymbols::object_initializer_name())) { 4494 4495 Symbol* name = m->name(); 4496 Symbol* signature = m->signature(); 4497 Klass* k = this_klass->super(); 4498 Method* super_m = NULL; 4499 while (k != NULL) { 4500 // skip supers that don't have final methods. 4501 if (k->has_final_method()) { 4502 // lookup a matching method in the super class hierarchy 4503 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4504 if (super_m == NULL) { 4505 break; // didn't find any match; get out 4506 } 4507 4508 if (super_m->is_final() && 4509 // matching method in super is final 4510 (Reflection::verify_field_access(this_klass(), 4511 super_m->method_holder(), 4512 super_m->method_holder(), 4513 super_m->access_flags(), false)) 4514 // this class can access super final method and therefore override 4515 ) { 4516 ResourceMark rm(THREAD); 4517 Exceptions::fthrow( 4518 THREAD_AND_LOCATION, 4519 vmSymbols::java_lang_VerifyError(), 4520 "class %s overrides final method %s.%s", 4521 this_klass->external_name(), 4522 name->as_C_string(), 4523 signature->as_C_string() 4524 ); 4525 return; 4526 } 4527 4528 // continue to look from super_m's holder's super. 4529 k = super_m->method_holder()->super(); 4530 continue; 4531 } 4532 4533 k = k->super(); 4534 } 4535 } 4536 } 4537 } 4538 4539 4540 // assumes that this_klass is an interface 4541 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4542 assert(this_klass->is_interface(), "not an interface"); 4543 Array<Method*>* methods = this_klass->methods(); 4544 int num_methods = methods->length(); 4545 4546 for (int index = 0; index < num_methods; index++) { 4547 Method* m = methods->at(index); 4548 // if m is static and not the init method, throw a verify error 4549 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4550 ResourceMark rm(THREAD); 4551 Exceptions::fthrow( 4552 THREAD_AND_LOCATION, 4553 vmSymbols::java_lang_VerifyError(), 4554 "Illegal static method %s in interface %s", 4555 m->name()->as_C_string(), 4556 this_klass->external_name() 4557 ); 4558 return; 4559 } 4560 } 4561 } 4562 4563 // utility methods for format checking 4564 4565 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4566 if (!_need_verify) { return; } 4567 4568 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4569 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4570 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4571 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4572 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4573 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4574 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4575 4576 if ((is_abstract && is_final) || 4577 (is_interface && !is_abstract) || 4578 (is_interface && major_gte_15 && (is_super || is_enum)) || 4579 (!is_interface && major_gte_15 && is_annotation)) { 4580 ResourceMark rm(THREAD); 4581 Exceptions::fthrow( 4582 THREAD_AND_LOCATION, 4583 vmSymbols::java_lang_ClassFormatError(), 4584 "Illegal class modifiers in class %s: 0x%X", 4585 _class_name->as_C_string(), flags 4586 ); 4587 return; 4588 } 4589 } 4590 4591 bool ClassFileParser::has_illegal_visibility(jint flags) { 4592 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4593 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4594 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4595 4596 return ((is_public && is_protected) || 4597 (is_public && is_private) || 4598 (is_protected && is_private)); 4599 } 4600 4601 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4602 u2 max_version = 4603 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : 4604 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION); 4605 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4606 (major <= max_version) && 4607 ((major != max_version) || 4608 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4609 } 4610 4611 void ClassFileParser::verify_legal_field_modifiers( 4612 jint flags, bool is_interface, TRAPS) { 4613 if (!_need_verify) { return; } 4614 4615 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4616 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4617 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4618 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4619 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4620 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4621 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4622 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4623 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4624 4625 bool is_illegal = false; 4626 4627 if (is_interface) { 4628 if (!is_public || !is_static || !is_final || is_private || 4629 is_protected || is_volatile || is_transient || 4630 (major_gte_15 && is_enum)) { 4631 is_illegal = true; 4632 } 4633 } else { // not interface 4634 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4635 is_illegal = true; 4636 } 4637 } 4638 4639 if (is_illegal) { 4640 ResourceMark rm(THREAD); 4641 Exceptions::fthrow( 4642 THREAD_AND_LOCATION, 4643 vmSymbols::java_lang_ClassFormatError(), 4644 "Illegal field modifiers in class %s: 0x%X", 4645 _class_name->as_C_string(), flags); 4646 return; 4647 } 4648 } 4649 4650 void ClassFileParser::verify_legal_method_modifiers( 4651 jint flags, bool is_interface, Symbol* name, TRAPS) { 4652 if (!_need_verify) { return; } 4653 4654 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4655 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4656 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4657 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4658 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4659 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4660 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4661 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4662 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4663 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4664 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4665 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4666 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4667 4668 bool is_illegal = false; 4669 4670 if (is_interface) { 4671 if (major_gte_8) { 4672 // Class file version is JAVA_8_VERSION or later Methods of 4673 // interfaces may set any of the flags except ACC_PROTECTED, 4674 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4675 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4676 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4677 (is_native || is_protected || is_final || is_synchronized) || 4678 // If a specific method of a class or interface has its 4679 // ACC_ABSTRACT flag set, it must not have any of its 4680 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4681 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4682 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4683 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4684 (is_abstract && (is_private || is_static || is_strict))) { 4685 is_illegal = true; 4686 } 4687 } else if (major_gte_15) { 4688 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4689 if (!is_public || is_static || is_final || is_synchronized || 4690 is_native || !is_abstract || is_strict) { 4691 is_illegal = true; 4692 } 4693 } else { 4694 // Class file version is pre-JAVA_1_5_VERSION 4695 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4696 is_illegal = true; 4697 } 4698 } 4699 } else { // not interface 4700 if (is_initializer) { 4701 if (is_static || is_final || is_synchronized || is_native || 4702 is_abstract || (major_gte_15 && is_bridge)) { 4703 is_illegal = true; 4704 } 4705 } else { // not initializer 4706 if (is_abstract) { 4707 if ((is_final || is_native || is_private || is_static || 4708 (major_gte_15 && (is_synchronized || is_strict)))) { 4709 is_illegal = true; 4710 } 4711 } 4712 if (has_illegal_visibility(flags)) { 4713 is_illegal = true; 4714 } 4715 } 4716 } 4717 4718 if (is_illegal) { 4719 ResourceMark rm(THREAD); 4720 Exceptions::fthrow( 4721 THREAD_AND_LOCATION, 4722 vmSymbols::java_lang_ClassFormatError(), 4723 "Method %s in class %s has illegal modifiers: 0x%X", 4724 name->as_C_string(), _class_name->as_C_string(), flags); 4725 return; 4726 } 4727 } 4728 4729 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4730 assert(_need_verify, "only called when _need_verify is true"); 4731 int i = 0; 4732 int count = length >> 2; 4733 for (int k=0; k<count; k++) { 4734 unsigned char b0 = buffer[i]; 4735 unsigned char b1 = buffer[i+1]; 4736 unsigned char b2 = buffer[i+2]; 4737 unsigned char b3 = buffer[i+3]; 4738 // For an unsigned char v, 4739 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4740 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4741 unsigned char res = b0 | b0 - 1 | 4742 b1 | b1 - 1 | 4743 b2 | b2 - 1 | 4744 b3 | b3 - 1; 4745 if (res >= 128) break; 4746 i += 4; 4747 } 4748 for(; i < length; i++) { 4749 unsigned short c; 4750 // no embedded zeros 4751 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4752 if(buffer[i] < 128) { 4753 continue; 4754 } 4755 if ((i + 5) < length) { // see if it's legal supplementary character 4756 if (UTF8::is_supplementary_character(&buffer[i])) { 4757 c = UTF8::get_supplementary_character(&buffer[i]); 4758 i += 5; 4759 continue; 4760 } 4761 } 4762 switch (buffer[i] >> 4) { 4763 default: break; 4764 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4765 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4766 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4767 c = (buffer[i] & 0x1F) << 6; 4768 i++; 4769 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4770 c += buffer[i] & 0x3F; 4771 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4772 // for classes with major > 47, c must a null or a character in its shortest form 4773 break; 4774 } 4775 } 4776 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4777 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4778 c = (buffer[i] & 0xF) << 12; 4779 i += 2; 4780 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4781 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4782 if (_major_version <= 47 || c >= 0x800) { 4783 // for classes with major > 47, c must be in its shortest form 4784 break; 4785 } 4786 } 4787 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4788 } // end of switch 4789 } // end of for 4790 } 4791 4792 // Checks if name is a legal class name. 4793 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4794 if (!_need_verify || _relax_verify) { return; } 4795 4796 char buf[fixed_buffer_size]; 4797 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4798 unsigned int length = name->utf8_length(); 4799 bool legal = false; 4800 4801 if (length > 0) { 4802 char* p; 4803 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4804 p = skip_over_field_signature(bytes, false, length, CHECK); 4805 legal = (p != NULL) && ((p - bytes) == (int)length); 4806 } else if (_major_version < JAVA_1_5_VERSION) { 4807 if (bytes[0] != '<') { 4808 p = skip_over_field_name(bytes, true, length); 4809 legal = (p != NULL) && ((p - bytes) == (int)length); 4810 } 4811 } else { 4812 // 4900761: relax the constraints based on JSR202 spec 4813 // Class names may be drawn from the entire Unicode character set. 4814 // Identifiers between '/' must be unqualified names. 4815 // The utf8 string has been verified when parsing cpool entries. 4816 legal = verify_unqualified_name(bytes, length, LegalClass); 4817 } 4818 } 4819 if (!legal) { 4820 ResourceMark rm(THREAD); 4821 Exceptions::fthrow( 4822 THREAD_AND_LOCATION, 4823 vmSymbols::java_lang_ClassFormatError(), 4824 "Illegal class name \"%s\" in class file %s", bytes, 4825 _class_name->as_C_string() 4826 ); 4827 return; 4828 } 4829 } 4830 4831 // Checks if name is a legal field name. 4832 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 4833 if (!_need_verify || _relax_verify) { return; } 4834 4835 char buf[fixed_buffer_size]; 4836 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4837 unsigned int length = name->utf8_length(); 4838 bool legal = false; 4839 4840 if (length > 0) { 4841 if (_major_version < JAVA_1_5_VERSION) { 4842 if (bytes[0] != '<') { 4843 char* p = skip_over_field_name(bytes, false, length); 4844 legal = (p != NULL) && ((p - bytes) == (int)length); 4845 } 4846 } else { 4847 // 4881221: relax the constraints based on JSR202 spec 4848 legal = verify_unqualified_name(bytes, length, LegalField); 4849 } 4850 } 4851 4852 if (!legal) { 4853 ResourceMark rm(THREAD); 4854 Exceptions::fthrow( 4855 THREAD_AND_LOCATION, 4856 vmSymbols::java_lang_ClassFormatError(), 4857 "Illegal field name \"%s\" in class %s", bytes, 4858 _class_name->as_C_string() 4859 ); 4860 return; 4861 } 4862 } 4863 4864 // Checks if name is a legal method name. 4865 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 4866 if (!_need_verify || _relax_verify) { return; } 4867 4868 assert(name != NULL, "method name is null"); 4869 char buf[fixed_buffer_size]; 4870 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4871 unsigned int length = name->utf8_length(); 4872 bool legal = false; 4873 4874 if (length > 0) { 4875 if (bytes[0] == '<') { 4876 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 4877 legal = true; 4878 } 4879 } else if (_major_version < JAVA_1_5_VERSION) { 4880 char* p; 4881 p = skip_over_field_name(bytes, false, length); 4882 legal = (p != NULL) && ((p - bytes) == (int)length); 4883 } else { 4884 // 4881221: relax the constraints based on JSR202 spec 4885 legal = verify_unqualified_name(bytes, length, LegalMethod); 4886 } 4887 } 4888 4889 if (!legal) { 4890 ResourceMark rm(THREAD); 4891 Exceptions::fthrow( 4892 THREAD_AND_LOCATION, 4893 vmSymbols::java_lang_ClassFormatError(), 4894 "Illegal method name \"%s\" in class %s", bytes, 4895 _class_name->as_C_string() 4896 ); 4897 return; 4898 } 4899 } 4900 4901 4902 // Checks if signature is a legal field signature. 4903 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 4904 if (!_need_verify) { return; } 4905 4906 char buf[fixed_buffer_size]; 4907 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4908 unsigned int length = signature->utf8_length(); 4909 char* p = skip_over_field_signature(bytes, false, length, CHECK); 4910 4911 if (p == NULL || (p - bytes) != (int)length) { 4912 throwIllegalSignature("Field", name, signature, CHECK); 4913 } 4914 } 4915 4916 // Checks if signature is a legal method signature. 4917 // Returns number of parameters 4918 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 4919 if (!_need_verify) { 4920 // make sure caller's args_size will be less than 0 even for non-static 4921 // method so it will be recomputed in compute_size_of_parameters(). 4922 return -2; 4923 } 4924 4925 unsigned int args_size = 0; 4926 char buf[fixed_buffer_size]; 4927 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4928 unsigned int length = signature->utf8_length(); 4929 char* nextp; 4930 4931 // The first character must be a '(' 4932 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 4933 length--; 4934 // Skip over legal field signatures 4935 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4936 while ((length > 0) && (nextp != NULL)) { 4937 args_size++; 4938 if (p[0] == 'J' || p[0] == 'D') { 4939 args_size++; 4940 } 4941 length -= nextp - p; 4942 p = nextp; 4943 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4944 } 4945 // The first non-signature thing better be a ')' 4946 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 4947 length--; 4948 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 4949 // All internal methods must return void 4950 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 4951 return args_size; 4952 } 4953 } else { 4954 // Now we better just have a return value 4955 nextp = skip_over_field_signature(p, true, length, CHECK_0); 4956 if (nextp && ((int)length == (nextp - p))) { 4957 return args_size; 4958 } 4959 } 4960 } 4961 } 4962 // Report error 4963 throwIllegalSignature("Method", name, signature, CHECK_0); 4964 return 0; 4965 } 4966 4967 4968 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4969 // Method names also may not contain the characters '<' or '>', unless <init> 4970 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4971 // method. Because these names have been checked as special cases before 4972 // calling this method in verify_legal_method_name. 4973 bool ClassFileParser::verify_unqualified_name( 4974 char* name, unsigned int length, int type) { 4975 jchar ch; 4976 4977 for (char* p = name; p != name + length; ) { 4978 ch = *p; 4979 if (ch < 128) { 4980 p++; 4981 if (ch == '.' || ch == ';' || ch == '[' ) { 4982 return false; // do not permit '.', ';', or '[' 4983 } 4984 if (type != LegalClass && ch == '/') { 4985 return false; // do not permit '/' unless it's class name 4986 } 4987 if (type == LegalMethod && (ch == '<' || ch == '>')) { 4988 return false; // do not permit '<' or '>' in method names 4989 } 4990 } else { 4991 char* tmp_p = UTF8::next(p, &ch); 4992 p = tmp_p; 4993 } 4994 } 4995 return true; 4996 } 4997 4998 4999 // Take pointer to a string. Skip over the longest part of the string that could 5000 // be taken as a fieldname. Allow '/' if slash_ok is true. 5001 // Return a pointer to just past the fieldname. 5002 // Return NULL if no fieldname at all was found, or in the case of slash_ok 5003 // being true, we saw consecutive slashes (meaning we were looking for a 5004 // qualified path but found something that was badly-formed). 5005 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 5006 char* p; 5007 jchar ch; 5008 jboolean last_is_slash = false; 5009 jboolean not_first_ch = false; 5010 5011 for (p = name; p != name + length; not_first_ch = true) { 5012 char* old_p = p; 5013 ch = *p; 5014 if (ch < 128) { 5015 p++; 5016 // quick check for ascii 5017 if ((ch >= 'a' && ch <= 'z') || 5018 (ch >= 'A' && ch <= 'Z') || 5019 (ch == '_' || ch == '$') || 5020 (not_first_ch && ch >= '0' && ch <= '9')) { 5021 last_is_slash = false; 5022 continue; 5023 } 5024 if (slash_ok && ch == '/') { 5025 if (last_is_slash) { 5026 return NULL; // Don't permit consecutive slashes 5027 } 5028 last_is_slash = true; 5029 continue; 5030 } 5031 } else { 5032 jint unicode_ch; 5033 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5034 p = tmp_p; 5035 last_is_slash = false; 5036 // Check if ch is Java identifier start or is Java identifier part 5037 // 4672820: call java.lang.Character methods directly without generating separate tables. 5038 EXCEPTION_MARK; 5039 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5040 5041 // return value 5042 JavaValue result(T_BOOLEAN); 5043 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5044 JavaCallArguments args; 5045 args.push_int(unicode_ch); 5046 5047 // public static boolean isJavaIdentifierStart(char ch); 5048 JavaCalls::call_static(&result, 5049 klass, 5050 vmSymbols::isJavaIdentifierStart_name(), 5051 vmSymbols::int_bool_signature(), 5052 &args, 5053 THREAD); 5054 5055 if (HAS_PENDING_EXCEPTION) { 5056 CLEAR_PENDING_EXCEPTION; 5057 return 0; 5058 } 5059 if (result.get_jboolean()) { 5060 continue; 5061 } 5062 5063 if (not_first_ch) { 5064 // public static boolean isJavaIdentifierPart(char ch); 5065 JavaCalls::call_static(&result, 5066 klass, 5067 vmSymbols::isJavaIdentifierPart_name(), 5068 vmSymbols::int_bool_signature(), 5069 &args, 5070 THREAD); 5071 5072 if (HAS_PENDING_EXCEPTION) { 5073 CLEAR_PENDING_EXCEPTION; 5074 return 0; 5075 } 5076 5077 if (result.get_jboolean()) { 5078 continue; 5079 } 5080 } 5081 } 5082 return (not_first_ch) ? old_p : NULL; 5083 } 5084 return (not_first_ch) ? p : NULL; 5085 } 5086 5087 5088 // Take pointer to a string. Skip over the longest part of the string that could 5089 // be taken as a field signature. Allow "void" if void_ok. 5090 // Return a pointer to just past the signature. 5091 // Return NULL if no legal signature is found. 5092 char* ClassFileParser::skip_over_field_signature(char* signature, 5093 bool void_ok, 5094 unsigned int length, 5095 TRAPS) { 5096 unsigned int array_dim = 0; 5097 while (length > 0) { 5098 switch (signature[0]) { 5099 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5100 case JVM_SIGNATURE_BOOLEAN: 5101 case JVM_SIGNATURE_BYTE: 5102 case JVM_SIGNATURE_CHAR: 5103 case JVM_SIGNATURE_SHORT: 5104 case JVM_SIGNATURE_INT: 5105 case JVM_SIGNATURE_FLOAT: 5106 case JVM_SIGNATURE_LONG: 5107 case JVM_SIGNATURE_DOUBLE: 5108 return signature + 1; 5109 case JVM_SIGNATURE_CLASS: { 5110 if (_major_version < JAVA_1_5_VERSION) { 5111 // Skip over the class name if one is there 5112 char* p = skip_over_field_name(signature + 1, true, --length); 5113 5114 // The next character better be a semicolon 5115 if (p && (p - signature) > 1 && p[0] == ';') { 5116 return p + 1; 5117 } 5118 } else { 5119 // 4900761: For class version > 48, any unicode is allowed in class name. 5120 length--; 5121 signature++; 5122 while (length > 0 && signature[0] != ';') { 5123 if (signature[0] == '.') { 5124 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5125 } 5126 length--; 5127 signature++; 5128 } 5129 if (signature[0] == ';') { return signature + 1; } 5130 } 5131 5132 return NULL; 5133 } 5134 case JVM_SIGNATURE_ARRAY: 5135 array_dim++; 5136 if (array_dim > 255) { 5137 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5138 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5139 } 5140 // The rest of what's there better be a legal signature 5141 signature++; 5142 length--; 5143 void_ok = false; 5144 break; 5145 5146 default: 5147 return NULL; 5148 } 5149 } 5150 return NULL; 5151 }