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_misc_Contended_signature): 1779 if (_location != _in_field && _location != _in_class) break; // only allow for fields and classes 1780 if (!EnableContended || (RestrictContended && !privileged)) break; // honor privileges 1781 return _sun_misc_Contended; 1782 default: break; 1783 } 1784 return AnnotationCollector::_unknown; 1785 } 1786 1787 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { 1788 if (is_contended()) 1789 f->set_contended_group(contended_group()); 1790 } 1791 1792 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { 1793 // If there's an error deallocate metadata for field annotations 1794 MetadataFactory::free_array<u1>(_loader_data, _field_annotations); 1795 MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations); 1796 } 1797 1798 void ClassFileParser::MethodAnnotationCollector::apply_to(methodHandle m) { 1799 if (has_annotation(_method_CallerSensitive)) 1800 m->set_caller_sensitive(true); 1801 if (has_annotation(_method_ForceInline)) 1802 m->set_force_inline(true); 1803 if (has_annotation(_method_DontInline)) 1804 m->set_dont_inline(true); 1805 if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) 1806 m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); 1807 if (has_annotation(_method_LambdaForm_Hidden)) 1808 m->set_hidden(true); 1809 } 1810 1811 void ClassFileParser::ClassAnnotationCollector::apply_to(instanceKlassHandle k) { 1812 k->set_is_contended(is_contended()); 1813 } 1814 1815 1816 #define MAX_ARGS_SIZE 255 1817 #define MAX_CODE_SIZE 65535 1818 #define INITIAL_MAX_LVT_NUMBER 256 1819 1820 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. 1821 * 1822 * Rules for LVT's and LVTT's are: 1823 * - There can be any number of LVT's and LVTT's. 1824 * - If there are n LVT's, it is the same as if there was just 1825 * one LVT containing all the entries from the n LVT's. 1826 * - There may be no more than one LVT entry per local variable. 1827 * Two LVT entries are 'equal' if these fields are the same: 1828 * start_pc, length, name, slot 1829 * - There may be no more than one LVTT entry per each LVT entry. 1830 * Each LVTT entry has to match some LVT entry. 1831 * - HotSpot internal LVT keeps natural ordering of class file LVT entries. 1832 */ 1833 void ClassFileParser::copy_localvariable_table(ConstMethod* cm, 1834 int lvt_cnt, 1835 u2* localvariable_table_length, 1836 u2** localvariable_table_start, 1837 int lvtt_cnt, 1838 u2* localvariable_type_table_length, 1839 u2** localvariable_type_table_start, 1840 TRAPS) { 1841 1842 LVT_Hash** lvt_Hash = NEW_RESOURCE_ARRAY(LVT_Hash*, HASH_ROW_SIZE); 1843 initialize_hashtable(lvt_Hash); 1844 1845 // To fill LocalVariableTable in 1846 Classfile_LVT_Element* cf_lvt; 1847 LocalVariableTableElement* lvt = cm->localvariable_table_start(); 1848 1849 for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { 1850 cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; 1851 for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { 1852 copy_lvt_element(&cf_lvt[idx], lvt); 1853 // If no duplicates, add LVT elem in hashtable lvt_Hash. 1854 if (LVT_put_after_lookup(lvt, lvt_Hash) == false 1855 && _need_verify 1856 && _major_version >= JAVA_1_5_VERSION) { 1857 clear_hashtable(lvt_Hash); 1858 classfile_parse_error("Duplicated LocalVariableTable attribute " 1859 "entry for '%s' in class file %s", 1860 _cp->symbol_at(lvt->name_cp_index)->as_utf8(), 1861 CHECK); 1862 } 1863 } 1864 } 1865 1866 // To merge LocalVariableTable and LocalVariableTypeTable 1867 Classfile_LVT_Element* cf_lvtt; 1868 LocalVariableTableElement lvtt_elem; 1869 1870 for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { 1871 cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; 1872 for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { 1873 copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); 1874 int index = hash(&lvtt_elem); 1875 LVT_Hash* entry = LVT_lookup(&lvtt_elem, index, lvt_Hash); 1876 if (entry == NULL) { 1877 if (_need_verify) { 1878 clear_hashtable(lvt_Hash); 1879 classfile_parse_error("LVTT entry for '%s' in class file %s " 1880 "does not match any LVT entry", 1881 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1882 CHECK); 1883 } 1884 } else if (entry->_elem->signature_cp_index != 0 && _need_verify) { 1885 clear_hashtable(lvt_Hash); 1886 classfile_parse_error("Duplicated LocalVariableTypeTable attribute " 1887 "entry for '%s' in class file %s", 1888 _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), 1889 CHECK); 1890 } else { 1891 // to add generic signatures into LocalVariableTable 1892 entry->_elem->signature_cp_index = lvtt_elem.descriptor_cp_index; 1893 } 1894 } 1895 } 1896 clear_hashtable(lvt_Hash); 1897 } 1898 1899 1900 void ClassFileParser::copy_method_annotations(ConstMethod* cm, 1901 u1* runtime_visible_annotations, 1902 int runtime_visible_annotations_length, 1903 u1* runtime_invisible_annotations, 1904 int runtime_invisible_annotations_length, 1905 u1* runtime_visible_parameter_annotations, 1906 int runtime_visible_parameter_annotations_length, 1907 u1* runtime_invisible_parameter_annotations, 1908 int runtime_invisible_parameter_annotations_length, 1909 u1* runtime_visible_type_annotations, 1910 int runtime_visible_type_annotations_length, 1911 u1* runtime_invisible_type_annotations, 1912 int runtime_invisible_type_annotations_length, 1913 u1* annotation_default, 1914 int annotation_default_length, 1915 TRAPS) { 1916 1917 AnnotationArray* a; 1918 1919 if (runtime_visible_annotations_length + 1920 runtime_invisible_annotations_length > 0) { 1921 a = assemble_annotations(runtime_visible_annotations, 1922 runtime_visible_annotations_length, 1923 runtime_invisible_annotations, 1924 runtime_invisible_annotations_length, 1925 CHECK); 1926 cm->set_method_annotations(a); 1927 } 1928 1929 if (runtime_visible_parameter_annotations_length + 1930 runtime_invisible_parameter_annotations_length > 0) { 1931 a = assemble_annotations(runtime_visible_parameter_annotations, 1932 runtime_visible_parameter_annotations_length, 1933 runtime_invisible_parameter_annotations, 1934 runtime_invisible_parameter_annotations_length, 1935 CHECK); 1936 cm->set_parameter_annotations(a); 1937 } 1938 1939 if (annotation_default_length > 0) { 1940 a = assemble_annotations(annotation_default, 1941 annotation_default_length, 1942 NULL, 1943 0, 1944 CHECK); 1945 cm->set_default_annotations(a); 1946 } 1947 1948 if (runtime_visible_type_annotations_length + 1949 runtime_invisible_type_annotations_length > 0) { 1950 a = assemble_annotations(runtime_visible_type_annotations, 1951 runtime_visible_type_annotations_length, 1952 runtime_invisible_type_annotations, 1953 runtime_invisible_type_annotations_length, 1954 CHECK); 1955 cm->set_type_annotations(a); 1956 } 1957 } 1958 1959 1960 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions 1961 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the 1962 // Method* to save footprint, so we only know the size of the resulting Method* when the 1963 // entire method attribute is parsed. 1964 // 1965 // The promoted_flags parameter is used to pass relevant access_flags 1966 // from the method back up to the containing klass. These flag values 1967 // are added to klass's access_flags. 1968 1969 methodHandle ClassFileParser::parse_method(bool is_interface, 1970 AccessFlags *promoted_flags, 1971 TRAPS) { 1972 ClassFileStream* cfs = stream(); 1973 methodHandle nullHandle; 1974 ResourceMark rm(THREAD); 1975 // Parse fixed parts 1976 cfs->guarantee_more(8, CHECK_(nullHandle)); // access_flags, name_index, descriptor_index, attributes_count 1977 1978 int flags = cfs->get_u2_fast(); 1979 u2 name_index = cfs->get_u2_fast(); 1980 int cp_size = _cp->length(); 1981 check_property( 1982 valid_symbol_at(name_index), 1983 "Illegal constant pool index %u for method name in class file %s", 1984 name_index, CHECK_(nullHandle)); 1985 Symbol* name = _cp->symbol_at(name_index); 1986 verify_legal_method_name(name, CHECK_(nullHandle)); 1987 1988 u2 signature_index = cfs->get_u2_fast(); 1989 guarantee_property( 1990 valid_symbol_at(signature_index), 1991 "Illegal constant pool index %u for method signature in class file %s", 1992 signature_index, CHECK_(nullHandle)); 1993 Symbol* signature = _cp->symbol_at(signature_index); 1994 1995 AccessFlags access_flags; 1996 if (name == vmSymbols::class_initializer_name()) { 1997 // We ignore the other access flags for a valid class initializer. 1998 // (JVM Spec 2nd ed., chapter 4.6) 1999 if (_major_version < 51) { // backward compatibility 2000 flags = JVM_ACC_STATIC; 2001 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { 2002 flags &= JVM_ACC_STATIC | JVM_ACC_STRICT; 2003 } 2004 } else { 2005 verify_legal_method_modifiers(flags, is_interface, name, CHECK_(nullHandle)); 2006 } 2007 2008 int args_size = -1; // only used when _need_verify is true 2009 if (_need_verify) { 2010 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + 2011 verify_legal_method_signature(name, signature, CHECK_(nullHandle)); 2012 if (args_size > MAX_ARGS_SIZE) { 2013 classfile_parse_error("Too many arguments in method signature in class file %s", CHECK_(nullHandle)); 2014 } 2015 } 2016 2017 access_flags.set_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); 2018 2019 // Default values for code and exceptions attribute elements 2020 u2 max_stack = 0; 2021 u2 max_locals = 0; 2022 u4 code_length = 0; 2023 u1* code_start = 0; 2024 u2 exception_table_length = 0; 2025 u2* exception_table_start = NULL; 2026 Array<int>* exception_handlers = Universe::the_empty_int_array(); 2027 u2 checked_exceptions_length = 0; 2028 u2* checked_exceptions_start = NULL; 2029 CompressedLineNumberWriteStream* linenumber_table = NULL; 2030 int linenumber_table_length = 0; 2031 int total_lvt_length = 0; 2032 u2 lvt_cnt = 0; 2033 u2 lvtt_cnt = 0; 2034 bool lvt_allocated = false; 2035 u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; 2036 u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; 2037 u2* localvariable_table_length; 2038 u2** localvariable_table_start; 2039 u2* localvariable_type_table_length; 2040 u2** localvariable_type_table_start; 2041 u2 method_parameters_length = 0; 2042 u1* method_parameters_data = NULL; 2043 bool method_parameters_seen = false; 2044 bool parsed_code_attribute = false; 2045 bool parsed_checked_exceptions_attribute = false; 2046 bool parsed_stackmap_attribute = false; 2047 // stackmap attribute - JDK1.5 2048 u1* stackmap_data = NULL; 2049 int stackmap_data_length = 0; 2050 u2 generic_signature_index = 0; 2051 MethodAnnotationCollector parsed_annotations; 2052 u1* runtime_visible_annotations = NULL; 2053 int runtime_visible_annotations_length = 0; 2054 u1* runtime_invisible_annotations = NULL; 2055 int runtime_invisible_annotations_length = 0; 2056 u1* runtime_visible_parameter_annotations = NULL; 2057 int runtime_visible_parameter_annotations_length = 0; 2058 u1* runtime_invisible_parameter_annotations = NULL; 2059 int runtime_invisible_parameter_annotations_length = 0; 2060 u1* runtime_visible_type_annotations = NULL; 2061 int runtime_visible_type_annotations_length = 0; 2062 u1* runtime_invisible_type_annotations = NULL; 2063 int runtime_invisible_type_annotations_length = 0; 2064 u1* annotation_default = NULL; 2065 int annotation_default_length = 0; 2066 2067 // Parse code and exceptions attribute 2068 u2 method_attributes_count = cfs->get_u2_fast(); 2069 while (method_attributes_count--) { 2070 cfs->guarantee_more(6, CHECK_(nullHandle)); // method_attribute_name_index, method_attribute_length 2071 u2 method_attribute_name_index = cfs->get_u2_fast(); 2072 u4 method_attribute_length = cfs->get_u4_fast(); 2073 check_property( 2074 valid_symbol_at(method_attribute_name_index), 2075 "Invalid method attribute name index %u in class file %s", 2076 method_attribute_name_index, CHECK_(nullHandle)); 2077 2078 Symbol* method_attribute_name = _cp->symbol_at(method_attribute_name_index); 2079 if (method_attribute_name == vmSymbols::tag_code()) { 2080 // Parse Code attribute 2081 if (_need_verify) { 2082 guarantee_property( 2083 !access_flags.is_native() && !access_flags.is_abstract(), 2084 "Code attribute in native or abstract methods in class file %s", 2085 CHECK_(nullHandle)); 2086 } 2087 if (parsed_code_attribute) { 2088 classfile_parse_error("Multiple Code attributes in class file %s", CHECK_(nullHandle)); 2089 } 2090 parsed_code_attribute = true; 2091 2092 // Stack size, locals size, and code size 2093 if (_major_version == 45 && _minor_version <= 2) { 2094 cfs->guarantee_more(4, CHECK_(nullHandle)); 2095 max_stack = cfs->get_u1_fast(); 2096 max_locals = cfs->get_u1_fast(); 2097 code_length = cfs->get_u2_fast(); 2098 } else { 2099 cfs->guarantee_more(8, CHECK_(nullHandle)); 2100 max_stack = cfs->get_u2_fast(); 2101 max_locals = cfs->get_u2_fast(); 2102 code_length = cfs->get_u4_fast(); 2103 } 2104 if (_need_verify) { 2105 guarantee_property(args_size <= max_locals, 2106 "Arguments can't fit into locals in class file %s", CHECK_(nullHandle)); 2107 guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, 2108 "Invalid method Code length %u in class file %s", 2109 code_length, CHECK_(nullHandle)); 2110 } 2111 // Code pointer 2112 code_start = cfs->get_u1_buffer(); 2113 assert(code_start != NULL, "null code start"); 2114 cfs->guarantee_more(code_length, CHECK_(nullHandle)); 2115 cfs->skip_u1_fast(code_length); 2116 2117 // Exception handler table 2118 cfs->guarantee_more(2, CHECK_(nullHandle)); // exception_table_length 2119 exception_table_length = cfs->get_u2_fast(); 2120 if (exception_table_length > 0) { 2121 exception_table_start = 2122 parse_exception_table(code_length, exception_table_length, CHECK_(nullHandle)); 2123 } 2124 2125 // Parse additional attributes in code attribute 2126 cfs->guarantee_more(2, CHECK_(nullHandle)); // code_attributes_count 2127 u2 code_attributes_count = cfs->get_u2_fast(); 2128 2129 unsigned int calculated_attribute_length = 0; 2130 2131 if (_major_version > 45 || (_major_version == 45 && _minor_version > 2)) { 2132 calculated_attribute_length = 2133 sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); 2134 } else { 2135 // max_stack, locals and length are smaller in pre-version 45.2 classes 2136 calculated_attribute_length = sizeof(u1) + sizeof(u1) + sizeof(u2); 2137 } 2138 calculated_attribute_length += 2139 code_length + 2140 sizeof(exception_table_length) + 2141 sizeof(code_attributes_count) + 2142 exception_table_length * 2143 ( sizeof(u2) + // start_pc 2144 sizeof(u2) + // end_pc 2145 sizeof(u2) + // handler_pc 2146 sizeof(u2) ); // catch_type_index 2147 2148 while (code_attributes_count--) { 2149 cfs->guarantee_more(6, CHECK_(nullHandle)); // code_attribute_name_index, code_attribute_length 2150 u2 code_attribute_name_index = cfs->get_u2_fast(); 2151 u4 code_attribute_length = cfs->get_u4_fast(); 2152 calculated_attribute_length += code_attribute_length + 2153 sizeof(code_attribute_name_index) + 2154 sizeof(code_attribute_length); 2155 check_property(valid_symbol_at(code_attribute_name_index), 2156 "Invalid code attribute name index %u in class file %s", 2157 code_attribute_name_index, 2158 CHECK_(nullHandle)); 2159 if (LoadLineNumberTables && 2160 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { 2161 // Parse and compress line number table 2162 parse_linenumber_table(code_attribute_length, code_length, 2163 &linenumber_table, CHECK_(nullHandle)); 2164 2165 } else if (LoadLocalVariableTables && 2166 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { 2167 // Parse local variable table 2168 if (!lvt_allocated) { 2169 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2170 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2171 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2172 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2173 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2174 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2175 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2176 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2177 lvt_allocated = true; 2178 } 2179 if (lvt_cnt == max_lvt_cnt) { 2180 max_lvt_cnt <<= 1; 2181 REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); 2182 REALLOC_RESOURCE_ARRAY(u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); 2183 } 2184 localvariable_table_start[lvt_cnt] = 2185 parse_localvariable_table(code_length, 2186 max_locals, 2187 code_attribute_length, 2188 &localvariable_table_length[lvt_cnt], 2189 false, // is not LVTT 2190 CHECK_(nullHandle)); 2191 total_lvt_length += localvariable_table_length[lvt_cnt]; 2192 lvt_cnt++; 2193 } else if (LoadLocalVariableTypeTables && 2194 _major_version >= JAVA_1_5_VERSION && 2195 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { 2196 if (!lvt_allocated) { 2197 localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2198 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2199 localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2200 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2201 localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( 2202 THREAD, u2, INITIAL_MAX_LVT_NUMBER); 2203 localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( 2204 THREAD, u2*, INITIAL_MAX_LVT_NUMBER); 2205 lvt_allocated = true; 2206 } 2207 // Parse local variable type table 2208 if (lvtt_cnt == max_lvtt_cnt) { 2209 max_lvtt_cnt <<= 1; 2210 REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); 2211 REALLOC_RESOURCE_ARRAY(u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); 2212 } 2213 localvariable_type_table_start[lvtt_cnt] = 2214 parse_localvariable_table(code_length, 2215 max_locals, 2216 code_attribute_length, 2217 &localvariable_type_table_length[lvtt_cnt], 2218 true, // is LVTT 2219 CHECK_(nullHandle)); 2220 lvtt_cnt++; 2221 } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && 2222 _cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { 2223 // Stack map is only needed by the new verifier in JDK1.5. 2224 if (parsed_stackmap_attribute) { 2225 classfile_parse_error("Multiple StackMapTable attributes in class file %s", CHECK_(nullHandle)); 2226 } 2227 stackmap_data = parse_stackmap_table(code_attribute_length, CHECK_(nullHandle)); 2228 stackmap_data_length = code_attribute_length; 2229 parsed_stackmap_attribute = true; 2230 } else { 2231 // Skip unknown attributes 2232 cfs->skip_u1(code_attribute_length, CHECK_(nullHandle)); 2233 } 2234 } 2235 // check method attribute length 2236 if (_need_verify) { 2237 guarantee_property(method_attribute_length == calculated_attribute_length, 2238 "Code segment has wrong length in class file %s", CHECK_(nullHandle)); 2239 } 2240 } else if (method_attribute_name == vmSymbols::tag_exceptions()) { 2241 // Parse Exceptions attribute 2242 if (parsed_checked_exceptions_attribute) { 2243 classfile_parse_error("Multiple Exceptions attributes in class file %s", CHECK_(nullHandle)); 2244 } 2245 parsed_checked_exceptions_attribute = true; 2246 checked_exceptions_start = 2247 parse_checked_exceptions(&checked_exceptions_length, 2248 method_attribute_length, 2249 CHECK_(nullHandle)); 2250 } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { 2251 // reject multiple method parameters 2252 if (method_parameters_seen) { 2253 classfile_parse_error("Multiple MethodParameters attributes in class file %s", CHECK_(nullHandle)); 2254 } 2255 method_parameters_seen = true; 2256 method_parameters_length = cfs->get_u1_fast(); 2257 if (method_attribute_length != (method_parameters_length * 4u) + 1u) { 2258 classfile_parse_error( 2259 "Invalid MethodParameters method attribute length %u in class file", 2260 method_attribute_length, CHECK_(nullHandle)); 2261 } 2262 method_parameters_data = cfs->get_u1_buffer(); 2263 cfs->skip_u2_fast(method_parameters_length); 2264 cfs->skip_u2_fast(method_parameters_length); 2265 // ignore this attribute if it cannot be reflected 2266 if (!SystemDictionary::Parameter_klass_loaded()) 2267 method_parameters_length = 0; 2268 } else if (method_attribute_name == vmSymbols::tag_synthetic()) { 2269 if (method_attribute_length != 0) { 2270 classfile_parse_error( 2271 "Invalid Synthetic method attribute length %u in class file %s", 2272 method_attribute_length, CHECK_(nullHandle)); 2273 } 2274 // Should we check that there hasn't already been a synthetic attribute? 2275 access_flags.set_is_synthetic(); 2276 } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 2277 if (method_attribute_length != 0) { 2278 classfile_parse_error( 2279 "Invalid Deprecated method attribute length %u in class file %s", 2280 method_attribute_length, CHECK_(nullHandle)); 2281 } 2282 } else if (_major_version >= JAVA_1_5_VERSION) { 2283 if (method_attribute_name == vmSymbols::tag_signature()) { 2284 if (method_attribute_length != 2) { 2285 classfile_parse_error( 2286 "Invalid Signature attribute length %u in class file %s", 2287 method_attribute_length, CHECK_(nullHandle)); 2288 } 2289 cfs->guarantee_more(2, CHECK_(nullHandle)); // generic_signature_index 2290 generic_signature_index = cfs->get_u2_fast(); 2291 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { 2292 runtime_visible_annotations_length = method_attribute_length; 2293 runtime_visible_annotations = cfs->get_u1_buffer(); 2294 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2295 parse_annotations(runtime_visible_annotations, 2296 runtime_visible_annotations_length, &parsed_annotations, 2297 CHECK_(nullHandle)); 2298 cfs->skip_u1(runtime_visible_annotations_length, CHECK_(nullHandle)); 2299 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { 2300 runtime_invisible_annotations_length = method_attribute_length; 2301 runtime_invisible_annotations = cfs->get_u1_buffer(); 2302 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2303 cfs->skip_u1(runtime_invisible_annotations_length, CHECK_(nullHandle)); 2304 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { 2305 runtime_visible_parameter_annotations_length = method_attribute_length; 2306 runtime_visible_parameter_annotations = cfs->get_u1_buffer(); 2307 assert(runtime_visible_parameter_annotations != NULL, "null visible parameter annotations"); 2308 cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_(nullHandle)); 2309 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { 2310 runtime_invisible_parameter_annotations_length = method_attribute_length; 2311 runtime_invisible_parameter_annotations = cfs->get_u1_buffer(); 2312 assert(runtime_invisible_parameter_annotations != NULL, "null invisible parameter annotations"); 2313 cfs->skip_u1(runtime_invisible_parameter_annotations_length, CHECK_(nullHandle)); 2314 } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { 2315 annotation_default_length = method_attribute_length; 2316 annotation_default = cfs->get_u1_buffer(); 2317 assert(annotation_default != NULL, "null annotation default"); 2318 cfs->skip_u1(annotation_default_length, CHECK_(nullHandle)); 2319 } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { 2320 runtime_visible_type_annotations_length = method_attribute_length; 2321 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2322 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2323 // No need for the VM to parse Type annotations 2324 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_(nullHandle)); 2325 } else if (PreserveAllAnnotations && method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { 2326 runtime_invisible_type_annotations_length = method_attribute_length; 2327 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2328 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2329 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK_(nullHandle)); 2330 } else { 2331 // Skip unknown attributes 2332 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2333 } 2334 } else { 2335 // Skip unknown attributes 2336 cfs->skip_u1(method_attribute_length, CHECK_(nullHandle)); 2337 } 2338 } 2339 2340 if (linenumber_table != NULL) { 2341 linenumber_table->write_terminator(); 2342 linenumber_table_length = linenumber_table->position(); 2343 } 2344 2345 // Make sure there's at least one Code attribute in non-native/non-abstract method 2346 if (_need_verify) { 2347 guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, 2348 "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_(nullHandle)); 2349 } 2350 2351 // All sizing information for a Method* is finally available, now create it 2352 InlineTableSizes sizes( 2353 total_lvt_length, 2354 linenumber_table_length, 2355 exception_table_length, 2356 checked_exceptions_length, 2357 method_parameters_length, 2358 generic_signature_index, 2359 runtime_visible_annotations_length + 2360 runtime_invisible_annotations_length, 2361 runtime_visible_parameter_annotations_length + 2362 runtime_invisible_parameter_annotations_length, 2363 runtime_visible_type_annotations_length + 2364 runtime_invisible_type_annotations_length, 2365 annotation_default_length, 2366 0); 2367 2368 Method* m = Method::allocate( 2369 _loader_data, code_length, access_flags, &sizes, 2370 ConstMethod::NORMAL, CHECK_(nullHandle)); 2371 2372 ClassLoadingService::add_class_method_size(m->size()*HeapWordSize); 2373 2374 // Fill in information from fixed part (access_flags already set) 2375 m->set_constants(_cp); 2376 m->set_name_index(name_index); 2377 m->set_signature_index(signature_index); 2378 #ifdef CC_INTERP 2379 // hmm is there a gc issue here?? 2380 ResultTypeFinder rtf(_cp->symbol_at(signature_index)); 2381 m->set_result_index(rtf.type()); 2382 #endif 2383 2384 if (args_size >= 0) { 2385 m->set_size_of_parameters(args_size); 2386 } else { 2387 m->compute_size_of_parameters(THREAD); 2388 } 2389 #ifdef ASSERT 2390 if (args_size >= 0) { 2391 m->compute_size_of_parameters(THREAD); 2392 assert(args_size == m->size_of_parameters(), ""); 2393 } 2394 #endif 2395 2396 // Fill in code attribute information 2397 m->set_max_stack(max_stack); 2398 m->set_max_locals(max_locals); 2399 if (stackmap_data != NULL) { 2400 m->constMethod()->copy_stackmap_data(_loader_data, stackmap_data, 2401 stackmap_data_length, CHECK_NULL); 2402 } 2403 2404 // Copy byte codes 2405 m->set_code(code_start); 2406 2407 // Copy line number table 2408 if (linenumber_table != NULL) { 2409 memcpy(m->compressed_linenumber_table(), 2410 linenumber_table->buffer(), linenumber_table_length); 2411 } 2412 2413 // Copy exception table 2414 if (exception_table_length > 0) { 2415 int size = 2416 exception_table_length * sizeof(ExceptionTableElement) / sizeof(u2); 2417 copy_u2_with_conversion((u2*) m->exception_table_start(), 2418 exception_table_start, size); 2419 } 2420 2421 // Copy method parameters 2422 if (method_parameters_length > 0) { 2423 MethodParametersElement* elem = m->constMethod()->method_parameters_start(); 2424 for (int i = 0; i < method_parameters_length; i++) { 2425 elem[i].name_cp_index = Bytes::get_Java_u2(method_parameters_data); 2426 method_parameters_data += 2; 2427 elem[i].flags = Bytes::get_Java_u2(method_parameters_data); 2428 method_parameters_data += 2; 2429 } 2430 } 2431 2432 // Copy checked exceptions 2433 if (checked_exceptions_length > 0) { 2434 int size = checked_exceptions_length * sizeof(CheckedExceptionElement) / sizeof(u2); 2435 copy_u2_with_conversion((u2*) m->checked_exceptions_start(), checked_exceptions_start, size); 2436 } 2437 2438 // Copy class file LVT's/LVTT's into the HotSpot internal LVT. 2439 if (total_lvt_length > 0) { 2440 promoted_flags->set_has_localvariable_table(); 2441 copy_localvariable_table(m->constMethod(), lvt_cnt, 2442 localvariable_table_length, 2443 localvariable_table_start, 2444 lvtt_cnt, 2445 localvariable_type_table_length, 2446 localvariable_type_table_start, CHECK_NULL); 2447 } 2448 2449 if (parsed_annotations.has_any_annotations()) 2450 parsed_annotations.apply_to(m); 2451 2452 // Copy annotations 2453 copy_method_annotations(m->constMethod(), 2454 runtime_visible_annotations, 2455 runtime_visible_annotations_length, 2456 runtime_invisible_annotations, 2457 runtime_invisible_annotations_length, 2458 runtime_visible_parameter_annotations, 2459 runtime_visible_parameter_annotations_length, 2460 runtime_invisible_parameter_annotations, 2461 runtime_invisible_parameter_annotations_length, 2462 runtime_visible_type_annotations, 2463 runtime_visible_type_annotations_length, 2464 runtime_invisible_type_annotations, 2465 runtime_invisible_type_annotations_length, 2466 annotation_default, 2467 annotation_default_length, 2468 CHECK_NULL); 2469 2470 if (name == vmSymbols::finalize_method_name() && 2471 signature == vmSymbols::void_method_signature()) { 2472 if (m->is_empty_method()) { 2473 _has_empty_finalizer = true; 2474 } else { 2475 _has_finalizer = true; 2476 } 2477 } 2478 if (name == vmSymbols::object_initializer_name() && 2479 signature == vmSymbols::void_method_signature() && 2480 m->is_vanilla_constructor()) { 2481 _has_vanilla_constructor = true; 2482 } 2483 2484 NOT_PRODUCT(m->verify()); 2485 return m; 2486 } 2487 2488 2489 // The promoted_flags parameter is used to pass relevant access_flags 2490 // from the methods back up to the containing klass. These flag values 2491 // are added to klass's access_flags. 2492 2493 Array<Method*>* ClassFileParser::parse_methods(bool is_interface, 2494 AccessFlags* promoted_flags, 2495 bool* has_final_method, 2496 bool* has_default_methods, 2497 TRAPS) { 2498 ClassFileStream* cfs = stream(); 2499 cfs->guarantee_more(2, CHECK_NULL); // length 2500 u2 length = cfs->get_u2_fast(); 2501 if (length == 0) { 2502 _methods = Universe::the_empty_method_array(); 2503 } else { 2504 _methods = MetadataFactory::new_array<Method*>(_loader_data, length, NULL, CHECK_NULL); 2505 2506 HandleMark hm(THREAD); 2507 for (int index = 0; index < length; index++) { 2508 methodHandle method = parse_method(is_interface, 2509 promoted_flags, 2510 CHECK_NULL); 2511 2512 if (method->is_final()) { 2513 *has_final_method = true; 2514 } 2515 if (is_interface && !method->is_abstract() && !method->is_static()) { 2516 // default method 2517 *has_default_methods = true; 2518 } 2519 _methods->at_put(index, method()); 2520 } 2521 2522 if (_need_verify && length > 1) { 2523 // Check duplicated methods 2524 ResourceMark rm(THREAD); 2525 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD( 2526 THREAD, NameSigHash*, HASH_ROW_SIZE); 2527 initialize_hashtable(names_and_sigs); 2528 bool dup = false; 2529 { 2530 debug_only(No_Safepoint_Verifier nsv;) 2531 for (int i = 0; i < length; i++) { 2532 Method* m = _methods->at(i); 2533 // If no duplicates, add name/signature in hashtable names_and_sigs. 2534 if (!put_after_lookup(m->name(), m->signature(), names_and_sigs)) { 2535 dup = true; 2536 break; 2537 } 2538 } 2539 } 2540 if (dup) { 2541 classfile_parse_error("Duplicate method name&signature in class file %s", 2542 CHECK_NULL); 2543 } 2544 } 2545 } 2546 return _methods; 2547 } 2548 2549 2550 intArray* ClassFileParser::sort_methods(Array<Method*>* methods) { 2551 int length = methods->length(); 2552 // If JVMTI original method ordering or sharing is enabled we have to 2553 // remember the original class file ordering. 2554 // We temporarily use the vtable_index field in the Method* to store the 2555 // class file index, so we can read in after calling qsort. 2556 // Put the method ordering in the shared archive. 2557 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2558 for (int index = 0; index < length; index++) { 2559 Method* m = methods->at(index); 2560 assert(!m->valid_vtable_index(), "vtable index should not be set"); 2561 m->set_vtable_index(index); 2562 } 2563 } 2564 // Sort method array by ascending method name (for faster lookups & vtable construction) 2565 // Note that the ordering is not alphabetical, see Symbol::fast_compare 2566 Method::sort_methods(methods); 2567 2568 intArray* method_ordering = NULL; 2569 // If JVMTI original method ordering or sharing is enabled construct int 2570 // array remembering the original ordering 2571 if (JvmtiExport::can_maintain_original_method_order() || DumpSharedSpaces) { 2572 method_ordering = new intArray(length); 2573 for (int index = 0; index < length; index++) { 2574 Method* m = methods->at(index); 2575 int old_index = m->vtable_index(); 2576 assert(old_index >= 0 && old_index < length, "invalid method index"); 2577 method_ordering->at_put(index, old_index); 2578 m->set_vtable_index(Method::invalid_vtable_index); 2579 } 2580 } 2581 return method_ordering; 2582 } 2583 2584 2585 void ClassFileParser::parse_classfile_sourcefile_attribute(TRAPS) { 2586 ClassFileStream* cfs = stream(); 2587 cfs->guarantee_more(2, CHECK); // sourcefile_index 2588 u2 sourcefile_index = cfs->get_u2_fast(); 2589 check_property( 2590 valid_symbol_at(sourcefile_index), 2591 "Invalid SourceFile attribute at constant pool index %u in class file %s", 2592 sourcefile_index, CHECK); 2593 set_class_sourcefile_index(sourcefile_index); 2594 } 2595 2596 2597 2598 void ClassFileParser::parse_classfile_source_debug_extension_attribute(int length, TRAPS) { 2599 ClassFileStream* cfs = stream(); 2600 u1* sde_buffer = cfs->get_u1_buffer(); 2601 assert(sde_buffer != NULL, "null sde buffer"); 2602 2603 // Don't bother storing it if there is no way to retrieve it 2604 if (JvmtiExport::can_get_source_debug_extension()) { 2605 assert((length+1) > length, "Overflow checking"); 2606 u1* sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); 2607 for (int i = 0; i < length; i++) { 2608 sde[i] = sde_buffer[i]; 2609 } 2610 sde[length] = '\0'; 2611 set_class_sde_buffer((char*)sde, length); 2612 } 2613 // Got utf8 string, set stream position forward 2614 cfs->skip_u1(length, CHECK); 2615 } 2616 2617 2618 // Inner classes can be static, private or protected (classic VM does this) 2619 #define RECOGNIZED_INNER_CLASS_MODIFIERS (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED | JVM_ACC_STATIC) 2620 2621 // Return number of classes in the inner classes attribute table 2622 u2 ClassFileParser::parse_classfile_inner_classes_attribute(u1* inner_classes_attribute_start, 2623 bool parsed_enclosingmethod_attribute, 2624 u2 enclosing_method_class_index, 2625 u2 enclosing_method_method_index, 2626 TRAPS) { 2627 ClassFileStream* cfs = stream(); 2628 u1* current_mark = cfs->current(); 2629 u2 length = 0; 2630 if (inner_classes_attribute_start != NULL) { 2631 cfs->set_current(inner_classes_attribute_start); 2632 cfs->guarantee_more(2, CHECK_0); // length 2633 length = cfs->get_u2_fast(); 2634 } 2635 2636 // 4-tuples of shorts of inner classes data and 2 shorts of enclosing 2637 // method data: 2638 // [inner_class_info_index, 2639 // outer_class_info_index, 2640 // inner_name_index, 2641 // inner_class_access_flags, 2642 // ... 2643 // enclosing_method_class_index, 2644 // enclosing_method_method_index] 2645 int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); 2646 Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0); 2647 _inner_classes = inner_classes; 2648 2649 int index = 0; 2650 int cp_size = _cp->length(); 2651 cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 2652 for (int n = 0; n < length; n++) { 2653 // Inner class index 2654 u2 inner_class_info_index = cfs->get_u2_fast(); 2655 check_property( 2656 inner_class_info_index == 0 || 2657 valid_klass_reference_at(inner_class_info_index), 2658 "inner_class_info_index %u has bad constant type in class file %s", 2659 inner_class_info_index, CHECK_0); 2660 // Outer class index 2661 u2 outer_class_info_index = cfs->get_u2_fast(); 2662 check_property( 2663 outer_class_info_index == 0 || 2664 valid_klass_reference_at(outer_class_info_index), 2665 "outer_class_info_index %u has bad constant type in class file %s", 2666 outer_class_info_index, CHECK_0); 2667 // Inner class name 2668 u2 inner_name_index = cfs->get_u2_fast(); 2669 check_property( 2670 inner_name_index == 0 || valid_symbol_at(inner_name_index), 2671 "inner_name_index %u has bad constant type in class file %s", 2672 inner_name_index, CHECK_0); 2673 if (_need_verify) { 2674 guarantee_property(inner_class_info_index != outer_class_info_index, 2675 "Class is both outer and inner class in class file %s", CHECK_0); 2676 } 2677 // Access flags 2678 AccessFlags inner_access_flags; 2679 jint flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; 2680 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 2681 // Set abstract bit for old class files for backward compatibility 2682 flags |= JVM_ACC_ABSTRACT; 2683 } 2684 verify_legal_class_modifiers(flags, CHECK_0); 2685 inner_access_flags.set_flags(flags); 2686 2687 inner_classes->at_put(index++, inner_class_info_index); 2688 inner_classes->at_put(index++, outer_class_info_index); 2689 inner_classes->at_put(index++, inner_name_index); 2690 inner_classes->at_put(index++, inner_access_flags.as_short()); 2691 } 2692 2693 // 4347400: make sure there's no duplicate entry in the classes array 2694 if (_need_verify && _major_version >= JAVA_1_5_VERSION) { 2695 for(int i = 0; i < length * 4; i += 4) { 2696 for(int j = i + 4; j < length * 4; j += 4) { 2697 guarantee_property((inner_classes->at(i) != inner_classes->at(j) || 2698 inner_classes->at(i+1) != inner_classes->at(j+1) || 2699 inner_classes->at(i+2) != inner_classes->at(j+2) || 2700 inner_classes->at(i+3) != inner_classes->at(j+3)), 2701 "Duplicate entry in InnerClasses in class file %s", 2702 CHECK_0); 2703 } 2704 } 2705 } 2706 2707 // Set EnclosingMethod class and method indexes. 2708 if (parsed_enclosingmethod_attribute) { 2709 inner_classes->at_put(index++, enclosing_method_class_index); 2710 inner_classes->at_put(index++, enclosing_method_method_index); 2711 } 2712 assert(index == size, "wrong size"); 2713 2714 // Restore buffer's current position. 2715 cfs->set_current(current_mark); 2716 2717 return length; 2718 } 2719 2720 void ClassFileParser::parse_classfile_synthetic_attribute(TRAPS) { 2721 set_class_synthetic_flag(true); 2722 } 2723 2724 void ClassFileParser::parse_classfile_signature_attribute(TRAPS) { 2725 ClassFileStream* cfs = stream(); 2726 u2 signature_index = cfs->get_u2(CHECK); 2727 check_property( 2728 valid_symbol_at(signature_index), 2729 "Invalid constant pool index %u in Signature attribute in class file %s", 2730 signature_index, CHECK); 2731 set_class_generic_signature_index(signature_index); 2732 } 2733 2734 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_byte_length, TRAPS) { 2735 ClassFileStream* cfs = stream(); 2736 u1* current_start = cfs->current(); 2737 2738 cfs->guarantee_more(2, CHECK); // length 2739 int attribute_array_length = cfs->get_u2_fast(); 2740 2741 guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, 2742 "Short length on BootstrapMethods in class file %s", 2743 CHECK); 2744 2745 // The attribute contains a counted array of counted tuples of shorts, 2746 // represending bootstrap specifiers: 2747 // length*{bootstrap_method_index, argument_count*{argument_index}} 2748 int operand_count = (attribute_byte_length - sizeof(u2)) / sizeof(u2); 2749 // operand_count = number of shorts in attr, except for leading length 2750 2751 // The attribute is copied into a short[] array. 2752 // The array begins with a series of short[2] pairs, one for each tuple. 2753 int index_size = (attribute_array_length * 2); 2754 2755 Array<u2>* operands = MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK); 2756 2757 // Eagerly assign operands so they will be deallocated with the constant 2758 // pool if there is an error. 2759 _cp->set_operands(operands); 2760 2761 int operand_fill_index = index_size; 2762 int cp_size = _cp->length(); 2763 2764 for (int n = 0; n < attribute_array_length; n++) { 2765 // Store a 32-bit offset into the header of the operand array. 2766 ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); 2767 2768 // Read a bootstrap specifier. 2769 cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc 2770 u2 bootstrap_method_index = cfs->get_u2_fast(); 2771 u2 argument_count = cfs->get_u2_fast(); 2772 check_property( 2773 valid_cp_range(bootstrap_method_index, cp_size) && 2774 _cp->tag_at(bootstrap_method_index).is_method_handle(), 2775 "bootstrap_method_index %u has bad constant type in class file %s", 2776 bootstrap_method_index, 2777 CHECK); 2778 operands->at_put(operand_fill_index++, bootstrap_method_index); 2779 operands->at_put(operand_fill_index++, argument_count); 2780 2781 cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] 2782 for (int j = 0; j < argument_count; j++) { 2783 u2 argument_index = cfs->get_u2_fast(); 2784 check_property( 2785 valid_cp_range(argument_index, cp_size) && 2786 _cp->tag_at(argument_index).is_loadable_constant(), 2787 "argument_index %u has bad constant type in class file %s", 2788 argument_index, 2789 CHECK); 2790 operands->at_put(operand_fill_index++, argument_index); 2791 } 2792 } 2793 2794 assert(operand_fill_index == operands->length(), "exact fill"); 2795 assert(ConstantPool::operand_array_length(operands) == attribute_array_length, "correct decode"); 2796 2797 u1* current_end = cfs->current(); 2798 guarantee_property(current_end == current_start + attribute_byte_length, 2799 "Bad length on BootstrapMethods in class file %s", 2800 CHECK); 2801 } 2802 2803 void ClassFileParser::parse_classfile_attributes(ClassFileParser::ClassAnnotationCollector* parsed_annotations, 2804 TRAPS) { 2805 ClassFileStream* cfs = stream(); 2806 // Set inner classes attribute to default sentinel 2807 _inner_classes = Universe::the_empty_short_array(); 2808 cfs->guarantee_more(2, CHECK); // attributes_count 2809 u2 attributes_count = cfs->get_u2_fast(); 2810 bool parsed_sourcefile_attribute = false; 2811 bool parsed_innerclasses_attribute = false; 2812 bool parsed_enclosingmethod_attribute = false; 2813 bool parsed_bootstrap_methods_attribute = false; 2814 u1* runtime_visible_annotations = NULL; 2815 int runtime_visible_annotations_length = 0; 2816 u1* runtime_invisible_annotations = NULL; 2817 int runtime_invisible_annotations_length = 0; 2818 u1* runtime_visible_type_annotations = NULL; 2819 int runtime_visible_type_annotations_length = 0; 2820 u1* runtime_invisible_type_annotations = NULL; 2821 int runtime_invisible_type_annotations_length = 0; 2822 u1* inner_classes_attribute_start = NULL; 2823 u4 inner_classes_attribute_length = 0; 2824 u2 enclosing_method_class_index = 0; 2825 u2 enclosing_method_method_index = 0; 2826 // Iterate over attributes 2827 while (attributes_count--) { 2828 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length 2829 u2 attribute_name_index = cfs->get_u2_fast(); 2830 u4 attribute_length = cfs->get_u4_fast(); 2831 check_property( 2832 valid_symbol_at(attribute_name_index), 2833 "Attribute name has bad constant pool index %u in class file %s", 2834 attribute_name_index, CHECK); 2835 Symbol* tag = _cp->symbol_at(attribute_name_index); 2836 if (tag == vmSymbols::tag_source_file()) { 2837 // Check for SourceFile tag 2838 if (_need_verify) { 2839 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); 2840 } 2841 if (parsed_sourcefile_attribute) { 2842 classfile_parse_error("Multiple SourceFile attributes in class file %s", CHECK); 2843 } else { 2844 parsed_sourcefile_attribute = true; 2845 } 2846 parse_classfile_sourcefile_attribute(CHECK); 2847 } else if (tag == vmSymbols::tag_source_debug_extension()) { 2848 // Check for SourceDebugExtension tag 2849 parse_classfile_source_debug_extension_attribute((int)attribute_length, CHECK); 2850 } else if (tag == vmSymbols::tag_inner_classes()) { 2851 // Check for InnerClasses tag 2852 if (parsed_innerclasses_attribute) { 2853 classfile_parse_error("Multiple InnerClasses attributes in class file %s", CHECK); 2854 } else { 2855 parsed_innerclasses_attribute = true; 2856 } 2857 inner_classes_attribute_start = cfs->get_u1_buffer(); 2858 inner_classes_attribute_length = attribute_length; 2859 cfs->skip_u1(inner_classes_attribute_length, CHECK); 2860 } else if (tag == vmSymbols::tag_synthetic()) { 2861 // Check for Synthetic tag 2862 // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec 2863 if (attribute_length != 0) { 2864 classfile_parse_error( 2865 "Invalid Synthetic classfile attribute length %u in class file %s", 2866 attribute_length, CHECK); 2867 } 2868 parse_classfile_synthetic_attribute(CHECK); 2869 } else if (tag == vmSymbols::tag_deprecated()) { 2870 // Check for Deprecatd tag - 4276120 2871 if (attribute_length != 0) { 2872 classfile_parse_error( 2873 "Invalid Deprecated classfile attribute length %u in class file %s", 2874 attribute_length, CHECK); 2875 } 2876 } else if (_major_version >= JAVA_1_5_VERSION) { 2877 if (tag == vmSymbols::tag_signature()) { 2878 if (attribute_length != 2) { 2879 classfile_parse_error( 2880 "Wrong Signature attribute length %u in class file %s", 2881 attribute_length, CHECK); 2882 } 2883 parse_classfile_signature_attribute(CHECK); 2884 } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { 2885 runtime_visible_annotations_length = attribute_length; 2886 runtime_visible_annotations = cfs->get_u1_buffer(); 2887 assert(runtime_visible_annotations != NULL, "null visible annotations"); 2888 parse_annotations(runtime_visible_annotations, 2889 runtime_visible_annotations_length, 2890 parsed_annotations, 2891 CHECK); 2892 cfs->skip_u1(runtime_visible_annotations_length, CHECK); 2893 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_annotations()) { 2894 runtime_invisible_annotations_length = attribute_length; 2895 runtime_invisible_annotations = cfs->get_u1_buffer(); 2896 assert(runtime_invisible_annotations != NULL, "null invisible annotations"); 2897 cfs->skip_u1(runtime_invisible_annotations_length, CHECK); 2898 } else if (tag == vmSymbols::tag_enclosing_method()) { 2899 if (parsed_enclosingmethod_attribute) { 2900 classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", CHECK); 2901 } else { 2902 parsed_enclosingmethod_attribute = true; 2903 } 2904 cfs->guarantee_more(4, CHECK); // class_index, method_index 2905 enclosing_method_class_index = cfs->get_u2_fast(); 2906 enclosing_method_method_index = cfs->get_u2_fast(); 2907 if (enclosing_method_class_index == 0) { 2908 classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", CHECK); 2909 } 2910 // Validate the constant pool indices and types 2911 check_property(valid_klass_reference_at(enclosing_method_class_index), 2912 "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); 2913 if (enclosing_method_method_index != 0 && 2914 (!_cp->is_within_bounds(enclosing_method_method_index) || 2915 !_cp->tag_at(enclosing_method_method_index).is_name_and_type())) { 2916 classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", CHECK); 2917 } 2918 } else if (tag == vmSymbols::tag_bootstrap_methods() && 2919 _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { 2920 if (parsed_bootstrap_methods_attribute) 2921 classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", CHECK); 2922 parsed_bootstrap_methods_attribute = true; 2923 parse_classfile_bootstrap_methods_attribute(attribute_length, CHECK); 2924 } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { 2925 runtime_visible_type_annotations_length = attribute_length; 2926 runtime_visible_type_annotations = cfs->get_u1_buffer(); 2927 assert(runtime_visible_type_annotations != NULL, "null visible type annotations"); 2928 // No need for the VM to parse Type annotations 2929 cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); 2930 } else if (PreserveAllAnnotations && tag == vmSymbols::tag_runtime_invisible_type_annotations()) { 2931 runtime_invisible_type_annotations_length = attribute_length; 2932 runtime_invisible_type_annotations = cfs->get_u1_buffer(); 2933 assert(runtime_invisible_type_annotations != NULL, "null invisible type annotations"); 2934 cfs->skip_u1(runtime_invisible_type_annotations_length, CHECK); 2935 } else { 2936 // Unknown attribute 2937 cfs->skip_u1(attribute_length, CHECK); 2938 } 2939 } else { 2940 // Unknown attribute 2941 cfs->skip_u1(attribute_length, CHECK); 2942 } 2943 } 2944 _annotations = assemble_annotations(runtime_visible_annotations, 2945 runtime_visible_annotations_length, 2946 runtime_invisible_annotations, 2947 runtime_invisible_annotations_length, 2948 CHECK); 2949 _type_annotations = assemble_annotations(runtime_visible_type_annotations, 2950 runtime_visible_type_annotations_length, 2951 runtime_invisible_type_annotations, 2952 runtime_invisible_type_annotations_length, 2953 CHECK); 2954 2955 if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { 2956 u2 num_of_classes = parse_classfile_inner_classes_attribute( 2957 inner_classes_attribute_start, 2958 parsed_innerclasses_attribute, 2959 enclosing_method_class_index, 2960 enclosing_method_method_index, 2961 CHECK); 2962 if (parsed_innerclasses_attribute &&_need_verify && _major_version >= JAVA_1_5_VERSION) { 2963 guarantee_property( 2964 inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, 2965 "Wrong InnerClasses attribute length in class file %s", CHECK); 2966 } 2967 } 2968 2969 if (_max_bootstrap_specifier_index >= 0) { 2970 guarantee_property(parsed_bootstrap_methods_attribute, 2971 "Missing BootstrapMethods attribute in class file %s", CHECK); 2972 } 2973 } 2974 2975 void ClassFileParser::apply_parsed_class_attributes(instanceKlassHandle k) { 2976 if (_synthetic_flag) 2977 k->set_is_synthetic(); 2978 if (_sourcefile_index != 0) { 2979 k->set_source_file_name_index(_sourcefile_index); 2980 } 2981 if (_generic_signature_index != 0) { 2982 k->set_generic_signature_index(_generic_signature_index); 2983 } 2984 if (_sde_buffer != NULL) { 2985 k->set_source_debug_extension(_sde_buffer, _sde_length); 2986 } 2987 } 2988 2989 // Transfer ownership of metadata allocated to the InstanceKlass. 2990 void ClassFileParser::apply_parsed_class_metadata( 2991 instanceKlassHandle this_klass, 2992 int java_fields_count, TRAPS) { 2993 // Assign annotations if needed 2994 if (_annotations != NULL || _type_annotations != NULL || 2995 _fields_annotations != NULL || _fields_type_annotations != NULL) { 2996 Annotations* annotations = Annotations::allocate(_loader_data, CHECK); 2997 annotations->set_class_annotations(_annotations); 2998 annotations->set_class_type_annotations(_type_annotations); 2999 annotations->set_fields_annotations(_fields_annotations); 3000 annotations->set_fields_type_annotations(_fields_type_annotations); 3001 this_klass->set_annotations(annotations); 3002 } 3003 3004 _cp->set_pool_holder(this_klass()); 3005 this_klass->set_constants(_cp); 3006 this_klass->set_fields(_fields, java_fields_count); 3007 this_klass->set_methods(_methods); 3008 this_klass->set_inner_classes(_inner_classes); 3009 this_klass->set_local_interfaces(_local_interfaces); 3010 this_klass->set_transitive_interfaces(_transitive_interfaces); 3011 3012 // Clear out these fields so they don't get deallocated by the destructor 3013 clear_class_metadata(); 3014 } 3015 3016 AnnotationArray* ClassFileParser::assemble_annotations(u1* runtime_visible_annotations, 3017 int runtime_visible_annotations_length, 3018 u1* runtime_invisible_annotations, 3019 int runtime_invisible_annotations_length, TRAPS) { 3020 AnnotationArray* annotations = NULL; 3021 if (runtime_visible_annotations != NULL || 3022 runtime_invisible_annotations != NULL) { 3023 annotations = MetadataFactory::new_array<u1>(_loader_data, 3024 runtime_visible_annotations_length + 3025 runtime_invisible_annotations_length, 3026 CHECK_(annotations)); 3027 if (runtime_visible_annotations != NULL) { 3028 for (int i = 0; i < runtime_visible_annotations_length; i++) { 3029 annotations->at_put(i, runtime_visible_annotations[i]); 3030 } 3031 } 3032 if (runtime_invisible_annotations != NULL) { 3033 for (int i = 0; i < runtime_invisible_annotations_length; i++) { 3034 int append = runtime_visible_annotations_length+i; 3035 annotations->at_put(append, runtime_invisible_annotations[i]); 3036 } 3037 } 3038 } 3039 return annotations; 3040 } 3041 3042 3043 #ifdef ASSERT 3044 static void parseAndPrintGenericSignatures( 3045 instanceKlassHandle this_klass, TRAPS) { 3046 assert(ParseAllGenericSignatures == true, "Shouldn't call otherwise"); 3047 ResourceMark rm; 3048 3049 if (this_klass->generic_signature() != NULL) { 3050 using namespace generic; 3051 ClassDescriptor* spec = ClassDescriptor::parse_generic_signature(this_klass(), CHECK); 3052 3053 tty->print_cr("Parsing %s", this_klass->generic_signature()->as_C_string()); 3054 spec->print_on(tty); 3055 3056 for (int i = 0; i < this_klass->methods()->length(); ++i) { 3057 Method* m = this_klass->methods()->at(i); 3058 MethodDescriptor* method_spec = MethodDescriptor::parse_generic_signature(m, spec); 3059 Symbol* sig = m->generic_signature(); 3060 if (sig == NULL) { 3061 sig = m->signature(); 3062 } 3063 tty->print_cr("Parsing %s", sig->as_C_string()); 3064 method_spec->print_on(tty); 3065 } 3066 } 3067 } 3068 #endif // def ASSERT 3069 3070 3071 instanceKlassHandle ClassFileParser::parse_super_class(int super_class_index, 3072 TRAPS) { 3073 instanceKlassHandle super_klass; 3074 if (super_class_index == 0) { 3075 check_property(_class_name == vmSymbols::java_lang_Object(), 3076 "Invalid superclass index %u in class file %s", 3077 super_class_index, 3078 CHECK_NULL); 3079 } else { 3080 check_property(valid_klass_reference_at(super_class_index), 3081 "Invalid superclass index %u in class file %s", 3082 super_class_index, 3083 CHECK_NULL); 3084 // The class name should be legal because it is checked when parsing constant pool. 3085 // However, make sure it is not an array type. 3086 bool is_array = false; 3087 if (_cp->tag_at(super_class_index).is_klass()) { 3088 super_klass = instanceKlassHandle(THREAD, _cp->resolved_klass_at(super_class_index)); 3089 if (_need_verify) 3090 is_array = super_klass->oop_is_array(); 3091 } else if (_need_verify) { 3092 is_array = (_cp->unresolved_klass_at(super_class_index)->byte_at(0) == JVM_SIGNATURE_ARRAY); 3093 } 3094 if (_need_verify) { 3095 guarantee_property(!is_array, 3096 "Bad superclass name in class file %s", CHECK_NULL); 3097 } 3098 } 3099 return super_klass; 3100 } 3101 3102 3103 // Values needed for oopmap and InstanceKlass creation 3104 class FieldLayoutInfo : public StackObj { 3105 public: 3106 int* nonstatic_oop_offsets; 3107 unsigned int* nonstatic_oop_counts; 3108 unsigned int nonstatic_oop_map_count; 3109 unsigned int total_oop_map_count; 3110 int instance_size; 3111 int nonstatic_field_size; 3112 int static_field_size; 3113 bool has_nonstatic_fields; 3114 }; 3115 3116 // Layout fields and fill in FieldLayoutInfo. Could use more refactoring! 3117 void ClassFileParser::layout_fields(Handle class_loader, 3118 FieldAllocationCount* fac, 3119 ClassAnnotationCollector* parsed_annotations, 3120 FieldLayoutInfo* info, 3121 TRAPS) { 3122 3123 // Field size and offset computation 3124 int nonstatic_field_size = _super_klass() == NULL ? 0 : _super_klass()->nonstatic_field_size(); 3125 int next_static_oop_offset; 3126 int next_static_double_offset; 3127 int next_static_word_offset; 3128 int next_static_short_offset; 3129 int next_static_byte_offset; 3130 int next_nonstatic_oop_offset; 3131 int next_nonstatic_double_offset; 3132 int next_nonstatic_word_offset; 3133 int next_nonstatic_short_offset; 3134 int next_nonstatic_byte_offset; 3135 int first_nonstatic_oop_offset; 3136 int next_nonstatic_field_offset; 3137 int next_nonstatic_padded_offset; 3138 3139 // Count the contended fields by type. 3140 // 3141 // We ignore static fields, because @Contended is not supported for them. 3142 // The layout code below will also ignore the static fields. 3143 int nonstatic_contended_count = 0; 3144 FieldAllocationCount fac_contended; 3145 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3146 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3147 if (fs.is_contended()) { 3148 fac_contended.count[atype]++; 3149 if (!fs.access_flags().is_static()) { 3150 nonstatic_contended_count++; 3151 } 3152 } 3153 } 3154 3155 3156 // Calculate the starting byte offsets 3157 next_static_oop_offset = InstanceMirrorKlass::offset_of_static_fields(); 3158 next_static_double_offset = next_static_oop_offset + 3159 ((fac->count[STATIC_OOP]) * heapOopSize); 3160 if ( fac->count[STATIC_DOUBLE] && 3161 (Universe::field_type_should_be_aligned(T_DOUBLE) || 3162 Universe::field_type_should_be_aligned(T_LONG)) ) { 3163 next_static_double_offset = align_size_up(next_static_double_offset, BytesPerLong); 3164 } 3165 3166 next_static_word_offset = next_static_double_offset + 3167 ((fac->count[STATIC_DOUBLE]) * BytesPerLong); 3168 next_static_short_offset = next_static_word_offset + 3169 ((fac->count[STATIC_WORD]) * BytesPerInt); 3170 next_static_byte_offset = next_static_short_offset + 3171 ((fac->count[STATIC_SHORT]) * BytesPerShort); 3172 3173 int nonstatic_fields_start = instanceOopDesc::base_offset_in_bytes() + 3174 nonstatic_field_size * heapOopSize; 3175 3176 next_nonstatic_field_offset = nonstatic_fields_start; 3177 3178 bool is_contended_class = parsed_annotations->is_contended(); 3179 3180 // Class is contended, pad before all the fields 3181 if (is_contended_class) { 3182 next_nonstatic_field_offset += ContendedPaddingWidth; 3183 } 3184 3185 // Compute the non-contended fields count. 3186 // The packing code below relies on these counts to determine if some field 3187 // can be squeezed into the alignment gap. Contended fields are obviously 3188 // exempt from that. 3189 unsigned int nonstatic_double_count = fac->count[NONSTATIC_DOUBLE] - fac_contended.count[NONSTATIC_DOUBLE]; 3190 unsigned int nonstatic_word_count = fac->count[NONSTATIC_WORD] - fac_contended.count[NONSTATIC_WORD]; 3191 unsigned int nonstatic_short_count = fac->count[NONSTATIC_SHORT] - fac_contended.count[NONSTATIC_SHORT]; 3192 unsigned int nonstatic_byte_count = fac->count[NONSTATIC_BYTE] - fac_contended.count[NONSTATIC_BYTE]; 3193 unsigned int nonstatic_oop_count = fac->count[NONSTATIC_OOP] - fac_contended.count[NONSTATIC_OOP]; 3194 3195 // Total non-static fields count, including every contended field 3196 unsigned int nonstatic_fields_count = fac->count[NONSTATIC_DOUBLE] + fac->count[NONSTATIC_WORD] + 3197 fac->count[NONSTATIC_SHORT] + fac->count[NONSTATIC_BYTE] + 3198 fac->count[NONSTATIC_OOP]; 3199 3200 bool super_has_nonstatic_fields = 3201 (_super_klass() != NULL && _super_klass->has_nonstatic_fields()); 3202 bool has_nonstatic_fields = super_has_nonstatic_fields || (nonstatic_fields_count != 0); 3203 3204 3205 // Prepare list of oops for oop map generation. 3206 // 3207 // "offset" and "count" lists are describing the set of contiguous oop 3208 // regions. offset[i] is the start of the i-th region, which then has 3209 // count[i] oops following. Before we know how many regions are required, 3210 // we pessimistically allocate the maps to fit all the oops into the 3211 // distinct regions. 3212 // 3213 // TODO: We add +1 to always allocate non-zero resource arrays; we need 3214 // to figure out if we still need to do this. 3215 int* nonstatic_oop_offsets; 3216 unsigned int* nonstatic_oop_counts; 3217 unsigned int nonstatic_oop_map_count = 0; 3218 unsigned int max_nonstatic_oop_maps = fac->count[NONSTATIC_OOP] + 1; 3219 3220 nonstatic_oop_offsets = NEW_RESOURCE_ARRAY_IN_THREAD( 3221 THREAD, int, max_nonstatic_oop_maps); 3222 nonstatic_oop_counts = NEW_RESOURCE_ARRAY_IN_THREAD( 3223 THREAD, unsigned int, max_nonstatic_oop_maps); 3224 3225 first_nonstatic_oop_offset = 0; // will be set for first oop field 3226 3227 bool compact_fields = CompactFields; 3228 int allocation_style = FieldsAllocationStyle; 3229 if( allocation_style < 0 || allocation_style > 2 ) { // Out of range? 3230 assert(false, "0 <= FieldsAllocationStyle <= 2"); 3231 allocation_style = 1; // Optimistic 3232 } 3233 3234 // The next classes have predefined hard-coded fields offsets 3235 // (see in JavaClasses::compute_hard_coded_offsets()). 3236 // Use default fields allocation order for them. 3237 if( (allocation_style != 0 || compact_fields ) && class_loader.is_null() && 3238 (_class_name == vmSymbols::java_lang_AssertionStatusDirectives() || 3239 _class_name == vmSymbols::java_lang_Class() || 3240 _class_name == vmSymbols::java_lang_ClassLoader() || 3241 _class_name == vmSymbols::java_lang_ref_Reference() || 3242 _class_name == vmSymbols::java_lang_ref_SoftReference() || 3243 _class_name == vmSymbols::java_lang_StackTraceElement() || 3244 _class_name == vmSymbols::java_lang_String() || 3245 _class_name == vmSymbols::java_lang_Throwable() || 3246 _class_name == vmSymbols::java_lang_Boolean() || 3247 _class_name == vmSymbols::java_lang_Character() || 3248 _class_name == vmSymbols::java_lang_Float() || 3249 _class_name == vmSymbols::java_lang_Double() || 3250 _class_name == vmSymbols::java_lang_Byte() || 3251 _class_name == vmSymbols::java_lang_Short() || 3252 _class_name == vmSymbols::java_lang_Integer() || 3253 _class_name == vmSymbols::java_lang_Long())) { 3254 allocation_style = 0; // Allocate oops first 3255 compact_fields = false; // Don't compact fields 3256 } 3257 3258 // Rearrange fields for a given allocation style 3259 if( allocation_style == 0 ) { 3260 // Fields order: oops, longs/doubles, ints, shorts/chars, bytes, padded fields 3261 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3262 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3263 (nonstatic_oop_count * heapOopSize); 3264 } else if( allocation_style == 1 ) { 3265 // Fields order: longs/doubles, ints, shorts/chars, bytes, oops, padded fields 3266 next_nonstatic_double_offset = next_nonstatic_field_offset; 3267 } else if( allocation_style == 2 ) { 3268 // Fields allocation: oops fields in super and sub classes are together. 3269 if( nonstatic_field_size > 0 && _super_klass() != NULL && 3270 _super_klass->nonstatic_oop_map_size() > 0 ) { 3271 unsigned int map_count = _super_klass->nonstatic_oop_map_count(); 3272 OopMapBlock* first_map = _super_klass->start_of_nonstatic_oop_maps(); 3273 OopMapBlock* last_map = first_map + map_count - 1; 3274 int next_offset = last_map->offset() + (last_map->count() * heapOopSize); 3275 if (next_offset == next_nonstatic_field_offset) { 3276 allocation_style = 0; // allocate oops first 3277 next_nonstatic_oop_offset = next_nonstatic_field_offset; 3278 next_nonstatic_double_offset = next_nonstatic_oop_offset + 3279 (nonstatic_oop_count * heapOopSize); 3280 } 3281 } 3282 if( allocation_style == 2 ) { 3283 allocation_style = 1; // allocate oops last 3284 next_nonstatic_double_offset = next_nonstatic_field_offset; 3285 } 3286 } else { 3287 ShouldNotReachHere(); 3288 } 3289 3290 int nonstatic_oop_space_count = 0; 3291 int nonstatic_word_space_count = 0; 3292 int nonstatic_short_space_count = 0; 3293 int nonstatic_byte_space_count = 0; 3294 int nonstatic_oop_space_offset; 3295 int nonstatic_word_space_offset; 3296 int nonstatic_short_space_offset; 3297 int nonstatic_byte_space_offset; 3298 3299 // Try to squeeze some of the fields into the gaps due to 3300 // long/double alignment. 3301 if( nonstatic_double_count > 0 ) { 3302 int offset = next_nonstatic_double_offset; 3303 next_nonstatic_double_offset = align_size_up(offset, BytesPerLong); 3304 if( compact_fields && offset != next_nonstatic_double_offset ) { 3305 // Allocate available fields into the gap before double field. 3306 int length = next_nonstatic_double_offset - offset; 3307 assert(length == BytesPerInt, ""); 3308 nonstatic_word_space_offset = offset; 3309 if( nonstatic_word_count > 0 ) { 3310 nonstatic_word_count -= 1; 3311 nonstatic_word_space_count = 1; // Only one will fit 3312 length -= BytesPerInt; 3313 offset += BytesPerInt; 3314 } 3315 nonstatic_short_space_offset = offset; 3316 while( length >= BytesPerShort && nonstatic_short_count > 0 ) { 3317 nonstatic_short_count -= 1; 3318 nonstatic_short_space_count += 1; 3319 length -= BytesPerShort; 3320 offset += BytesPerShort; 3321 } 3322 nonstatic_byte_space_offset = offset; 3323 while( length > 0 && nonstatic_byte_count > 0 ) { 3324 nonstatic_byte_count -= 1; 3325 nonstatic_byte_space_count += 1; 3326 length -= 1; 3327 } 3328 // Allocate oop field in the gap if there are no other fields for that. 3329 nonstatic_oop_space_offset = offset; 3330 if( length >= heapOopSize && nonstatic_oop_count > 0 && 3331 allocation_style != 0 ) { // when oop fields not first 3332 nonstatic_oop_count -= 1; 3333 nonstatic_oop_space_count = 1; // Only one will fit 3334 length -= heapOopSize; 3335 offset += heapOopSize; 3336 } 3337 } 3338 } 3339 3340 next_nonstatic_word_offset = next_nonstatic_double_offset + 3341 (nonstatic_double_count * BytesPerLong); 3342 next_nonstatic_short_offset = next_nonstatic_word_offset + 3343 (nonstatic_word_count * BytesPerInt); 3344 next_nonstatic_byte_offset = next_nonstatic_short_offset + 3345 (nonstatic_short_count * BytesPerShort); 3346 next_nonstatic_padded_offset = next_nonstatic_byte_offset + 3347 nonstatic_byte_count; 3348 3349 // let oops jump before padding with this allocation style 3350 if( allocation_style == 1 ) { 3351 next_nonstatic_oop_offset = next_nonstatic_padded_offset; 3352 if( nonstatic_oop_count > 0 ) { 3353 next_nonstatic_oop_offset = align_size_up(next_nonstatic_oop_offset, heapOopSize); 3354 } 3355 next_nonstatic_padded_offset = next_nonstatic_oop_offset + (nonstatic_oop_count * heapOopSize); 3356 } 3357 3358 // Iterate over fields again and compute correct offsets. 3359 // The field allocation type was temporarily stored in the offset slot. 3360 // oop fields are located before non-oop fields (static and non-static). 3361 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3362 3363 // skip already laid out fields 3364 if (fs.is_offset_set()) continue; 3365 3366 // contended instance fields are handled below 3367 if (fs.is_contended() && !fs.access_flags().is_static()) continue; 3368 3369 int real_offset; 3370 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3371 3372 // pack the rest of the fields 3373 switch (atype) { 3374 case STATIC_OOP: 3375 real_offset = next_static_oop_offset; 3376 next_static_oop_offset += heapOopSize; 3377 break; 3378 case STATIC_BYTE: 3379 real_offset = next_static_byte_offset; 3380 next_static_byte_offset += 1; 3381 break; 3382 case STATIC_SHORT: 3383 real_offset = next_static_short_offset; 3384 next_static_short_offset += BytesPerShort; 3385 break; 3386 case STATIC_WORD: 3387 real_offset = next_static_word_offset; 3388 next_static_word_offset += BytesPerInt; 3389 break; 3390 case STATIC_DOUBLE: 3391 real_offset = next_static_double_offset; 3392 next_static_double_offset += BytesPerLong; 3393 break; 3394 case NONSTATIC_OOP: 3395 if( nonstatic_oop_space_count > 0 ) { 3396 real_offset = nonstatic_oop_space_offset; 3397 nonstatic_oop_space_offset += heapOopSize; 3398 nonstatic_oop_space_count -= 1; 3399 } else { 3400 real_offset = next_nonstatic_oop_offset; 3401 next_nonstatic_oop_offset += heapOopSize; 3402 } 3403 // Update oop maps 3404 if( nonstatic_oop_map_count > 0 && 3405 nonstatic_oop_offsets[nonstatic_oop_map_count - 1] == 3406 real_offset - 3407 int(nonstatic_oop_counts[nonstatic_oop_map_count - 1]) * 3408 heapOopSize ) { 3409 // Extend current oop map 3410 assert(nonstatic_oop_map_count - 1 < max_nonstatic_oop_maps, "range check"); 3411 nonstatic_oop_counts[nonstatic_oop_map_count - 1] += 1; 3412 } else { 3413 // Create new oop map 3414 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3415 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3416 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3417 nonstatic_oop_map_count += 1; 3418 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3419 first_nonstatic_oop_offset = real_offset; 3420 } 3421 } 3422 break; 3423 case NONSTATIC_BYTE: 3424 if( nonstatic_byte_space_count > 0 ) { 3425 real_offset = nonstatic_byte_space_offset; 3426 nonstatic_byte_space_offset += 1; 3427 nonstatic_byte_space_count -= 1; 3428 } else { 3429 real_offset = next_nonstatic_byte_offset; 3430 next_nonstatic_byte_offset += 1; 3431 } 3432 break; 3433 case NONSTATIC_SHORT: 3434 if( nonstatic_short_space_count > 0 ) { 3435 real_offset = nonstatic_short_space_offset; 3436 nonstatic_short_space_offset += BytesPerShort; 3437 nonstatic_short_space_count -= 1; 3438 } else { 3439 real_offset = next_nonstatic_short_offset; 3440 next_nonstatic_short_offset += BytesPerShort; 3441 } 3442 break; 3443 case NONSTATIC_WORD: 3444 if( nonstatic_word_space_count > 0 ) { 3445 real_offset = nonstatic_word_space_offset; 3446 nonstatic_word_space_offset += BytesPerInt; 3447 nonstatic_word_space_count -= 1; 3448 } else { 3449 real_offset = next_nonstatic_word_offset; 3450 next_nonstatic_word_offset += BytesPerInt; 3451 } 3452 break; 3453 case NONSTATIC_DOUBLE: 3454 real_offset = next_nonstatic_double_offset; 3455 next_nonstatic_double_offset += BytesPerLong; 3456 break; 3457 default: 3458 ShouldNotReachHere(); 3459 } 3460 fs.set_offset(real_offset); 3461 } 3462 3463 3464 // Handle the contended cases. 3465 // 3466 // Each contended field should not intersect the cache line with another contended field. 3467 // In the absence of alignment information, we end up with pessimistically separating 3468 // the fields with full-width padding. 3469 // 3470 // Additionally, this should not break alignment for the fields, so we round the alignment up 3471 // for each field. 3472 if (nonstatic_contended_count > 0) { 3473 3474 // if there is at least one contended field, we need to have pre-padding for them 3475 next_nonstatic_padded_offset += ContendedPaddingWidth; 3476 3477 // collect all contended groups 3478 BitMap bm(_cp->size()); 3479 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3480 // skip already laid out fields 3481 if (fs.is_offset_set()) continue; 3482 3483 if (fs.is_contended()) { 3484 bm.set_bit(fs.contended_group()); 3485 } 3486 } 3487 3488 int current_group = -1; 3489 while ((current_group = (int)bm.get_next_one_offset(current_group + 1)) != (int)bm.size()) { 3490 3491 for (AllFieldStream fs(_fields, _cp); !fs.done(); fs.next()) { 3492 3493 // skip already laid out fields 3494 if (fs.is_offset_set()) continue; 3495 3496 // skip non-contended fields and fields from different group 3497 if (!fs.is_contended() || (fs.contended_group() != current_group)) continue; 3498 3499 // handle statics below 3500 if (fs.access_flags().is_static()) continue; 3501 3502 int real_offset; 3503 FieldAllocationType atype = (FieldAllocationType) fs.allocation_type(); 3504 3505 switch (atype) { 3506 case NONSTATIC_BYTE: 3507 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, 1); 3508 real_offset = next_nonstatic_padded_offset; 3509 next_nonstatic_padded_offset += 1; 3510 break; 3511 3512 case NONSTATIC_SHORT: 3513 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerShort); 3514 real_offset = next_nonstatic_padded_offset; 3515 next_nonstatic_padded_offset += BytesPerShort; 3516 break; 3517 3518 case NONSTATIC_WORD: 3519 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerInt); 3520 real_offset = next_nonstatic_padded_offset; 3521 next_nonstatic_padded_offset += BytesPerInt; 3522 break; 3523 3524 case NONSTATIC_DOUBLE: 3525 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, BytesPerLong); 3526 real_offset = next_nonstatic_padded_offset; 3527 next_nonstatic_padded_offset += BytesPerLong; 3528 break; 3529 3530 case NONSTATIC_OOP: 3531 next_nonstatic_padded_offset = align_size_up(next_nonstatic_padded_offset, heapOopSize); 3532 real_offset = next_nonstatic_padded_offset; 3533 next_nonstatic_padded_offset += heapOopSize; 3534 3535 // Create new oop map 3536 assert(nonstatic_oop_map_count < max_nonstatic_oop_maps, "range check"); 3537 nonstatic_oop_offsets[nonstatic_oop_map_count] = real_offset; 3538 nonstatic_oop_counts [nonstatic_oop_map_count] = 1; 3539 nonstatic_oop_map_count += 1; 3540 if( first_nonstatic_oop_offset == 0 ) { // Undefined 3541 first_nonstatic_oop_offset = real_offset; 3542 } 3543 break; 3544 3545 default: 3546 ShouldNotReachHere(); 3547 } 3548 3549 if (fs.contended_group() == 0) { 3550 // Contended group defines the equivalence class over the fields: 3551 // the fields within the same contended group are not inter-padded. 3552 // The only exception is default group, which does not incur the 3553 // equivalence, and so requires intra-padding. 3554 next_nonstatic_padded_offset += ContendedPaddingWidth; 3555 } 3556 3557 fs.set_offset(real_offset); 3558 } // for 3559 3560 // Start laying out the next group. 3561 // Note that this will effectively pad the last group in the back; 3562 // this is expected to alleviate memory contention effects for 3563 // subclass fields and/or adjacent object. 3564 // If this was the default group, the padding is already in place. 3565 if (current_group != 0) { 3566 next_nonstatic_padded_offset += ContendedPaddingWidth; 3567 } 3568 } 3569 3570 // handle static fields 3571 } 3572 3573 // Entire class is contended, pad in the back. 3574 // This helps to alleviate memory contention effects for subclass fields 3575 // and/or adjacent object. 3576 if (is_contended_class) { 3577 next_nonstatic_padded_offset += ContendedPaddingWidth; 3578 } 3579 3580 int notaligned_nonstatic_fields_end = next_nonstatic_padded_offset; 3581 3582 int nonstatic_fields_end = align_size_up(notaligned_nonstatic_fields_end, heapOopSize); 3583 int instance_end = align_size_up(notaligned_nonstatic_fields_end, wordSize); 3584 int static_fields_end = align_size_up(next_static_byte_offset, wordSize); 3585 3586 int static_field_size = (static_fields_end - 3587 InstanceMirrorKlass::offset_of_static_fields()) / wordSize; 3588 nonstatic_field_size = nonstatic_field_size + 3589 (nonstatic_fields_end - nonstatic_fields_start) / heapOopSize; 3590 3591 int instance_size = align_object_size(instance_end / wordSize); 3592 3593 assert(instance_size == align_object_size(align_size_up( 3594 (instanceOopDesc::base_offset_in_bytes() + nonstatic_field_size*heapOopSize), 3595 wordSize) / wordSize), "consistent layout helper value"); 3596 3597 // Invariant: nonstatic_field end/start should only change if there are 3598 // nonstatic fields in the class, or if the class is contended. We compare 3599 // against the non-aligned value, so that end alignment will not fail the 3600 // assert without actually having the fields. 3601 assert((notaligned_nonstatic_fields_end == nonstatic_fields_start) || 3602 is_contended_class || 3603 (nonstatic_fields_count > 0), "double-check nonstatic start/end"); 3604 3605 // Number of non-static oop map blocks allocated at end of klass. 3606 const unsigned int total_oop_map_count = 3607 compute_oop_map_count(_super_klass, nonstatic_oop_map_count, 3608 first_nonstatic_oop_offset); 3609 3610 #ifndef PRODUCT 3611 if (PrintFieldLayout) { 3612 print_field_layout(_class_name, 3613 _fields, 3614 _cp, 3615 instance_size, 3616 nonstatic_fields_start, 3617 nonstatic_fields_end, 3618 static_fields_end); 3619 } 3620 3621 #endif 3622 // Pass back information needed for InstanceKlass creation 3623 info->nonstatic_oop_offsets = nonstatic_oop_offsets; 3624 info->nonstatic_oop_counts = nonstatic_oop_counts; 3625 info->nonstatic_oop_map_count = nonstatic_oop_map_count; 3626 info->total_oop_map_count = total_oop_map_count; 3627 info->instance_size = instance_size; 3628 info->static_field_size = static_field_size; 3629 info->nonstatic_field_size = nonstatic_field_size; 3630 info->has_nonstatic_fields = has_nonstatic_fields; 3631 } 3632 3633 3634 instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name, 3635 ClassLoaderData* loader_data, 3636 Handle protection_domain, 3637 KlassHandle host_klass, 3638 GrowableArray<Handle>* cp_patches, 3639 TempNewSymbol& parsed_name, 3640 bool verify, 3641 TRAPS) { 3642 3643 // When a retransformable agent is attached, JVMTI caches the 3644 // class bytes that existed before the first retransformation. 3645 // If RedefineClasses() was used before the retransformable 3646 // agent attached, then the cached class bytes may not be the 3647 // original class bytes. 3648 JvmtiCachedClassFileData *cached_class_file = NULL; 3649 Handle class_loader(THREAD, loader_data->class_loader()); 3650 bool has_default_methods = false; 3651 ResourceMark rm(THREAD); 3652 3653 ClassFileStream* cfs = stream(); 3654 // Timing 3655 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 3656 JavaThread* jt = (JavaThread*) THREAD; 3657 3658 PerfClassTraceTime ctimer(ClassLoader::perf_class_parse_time(), 3659 ClassLoader::perf_class_parse_selftime(), 3660 NULL, 3661 jt->get_thread_stat()->perf_recursion_counts_addr(), 3662 jt->get_thread_stat()->perf_timers_addr(), 3663 PerfClassTraceTime::PARSE_CLASS); 3664 3665 init_parsed_class_attributes(loader_data); 3666 3667 if (JvmtiExport::should_post_class_file_load_hook()) { 3668 // Get the cached class file bytes (if any) from the class that 3669 // is being redefined or retransformed. We use jvmti_thread_state() 3670 // instead of JvmtiThreadState::state_for(jt) so we don't allocate 3671 // a JvmtiThreadState any earlier than necessary. This will help 3672 // avoid the bug described by 7126851. 3673 JvmtiThreadState *state = jt->jvmti_thread_state(); 3674 if (state != NULL) { 3675 KlassHandle *h_class_being_redefined = 3676 state->get_class_being_redefined(); 3677 if (h_class_being_redefined != NULL) { 3678 instanceKlassHandle ikh_class_being_redefined = 3679 instanceKlassHandle(THREAD, (*h_class_being_redefined)()); 3680 cached_class_file = ikh_class_being_redefined->get_cached_class_file(); 3681 } 3682 } 3683 3684 unsigned char* ptr = cfs->buffer(); 3685 unsigned char* end_ptr = cfs->buffer() + cfs->length(); 3686 3687 JvmtiExport::post_class_file_load_hook(name, class_loader(), protection_domain, 3688 &ptr, &end_ptr, &cached_class_file); 3689 3690 if (ptr != cfs->buffer()) { 3691 // JVMTI agent has modified class file data. 3692 // Set new class file stream using JVMTI agent modified 3693 // class file data. 3694 cfs = new ClassFileStream(ptr, end_ptr - ptr, cfs->source()); 3695 set_stream(cfs); 3696 } 3697 } 3698 3699 _host_klass = host_klass; 3700 _cp_patches = cp_patches; 3701 3702 instanceKlassHandle nullHandle; 3703 3704 // Figure out whether we can skip format checking (matching classic VM behavior) 3705 _need_verify = Verifier::should_verify_for(class_loader(), verify); 3706 3707 // Set the verify flag in stream 3708 cfs->set_verify(_need_verify); 3709 3710 // Save the class file name for easier error message printing. 3711 _class_name = (name != NULL) ? name : vmSymbols::unknown_class_name(); 3712 3713 cfs->guarantee_more(8, CHECK_(nullHandle)); // magic, major, minor 3714 // Magic value 3715 u4 magic = cfs->get_u4_fast(); 3716 guarantee_property(magic == JAVA_CLASSFILE_MAGIC, 3717 "Incompatible magic value %u in class file %s", 3718 magic, CHECK_(nullHandle)); 3719 3720 // Version numbers 3721 u2 minor_version = cfs->get_u2_fast(); 3722 u2 major_version = cfs->get_u2_fast(); 3723 3724 // Check version numbers - we check this even with verifier off 3725 if (!is_supported_version(major_version, minor_version)) { 3726 if (name == NULL) { 3727 Exceptions::fthrow( 3728 THREAD_AND_LOCATION, 3729 vmSymbols::java_lang_UnsupportedClassVersionError(), 3730 "Unsupported major.minor version %u.%u", 3731 major_version, 3732 minor_version); 3733 } else { 3734 ResourceMark rm(THREAD); 3735 Exceptions::fthrow( 3736 THREAD_AND_LOCATION, 3737 vmSymbols::java_lang_UnsupportedClassVersionError(), 3738 "%s : Unsupported major.minor version %u.%u", 3739 name->as_C_string(), 3740 major_version, 3741 minor_version); 3742 } 3743 return nullHandle; 3744 } 3745 3746 _major_version = major_version; 3747 _minor_version = minor_version; 3748 3749 3750 // Check if verification needs to be relaxed for this class file 3751 // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376) 3752 _relax_verify = Verifier::relax_verify_for(class_loader()); 3753 3754 // Constant pool 3755 constantPoolHandle cp = parse_constant_pool(CHECK_(nullHandle)); 3756 3757 int cp_size = cp->length(); 3758 3759 cfs->guarantee_more(8, CHECK_(nullHandle)); // flags, this_class, super_class, infs_len 3760 3761 // Access flags 3762 AccessFlags access_flags; 3763 jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; 3764 3765 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { 3766 // Set abstract bit for old class files for backward compatibility 3767 flags |= JVM_ACC_ABSTRACT; 3768 } 3769 verify_legal_class_modifiers(flags, CHECK_(nullHandle)); 3770 access_flags.set_flags(flags); 3771 3772 // This class and superclass 3773 u2 this_class_index = cfs->get_u2_fast(); 3774 check_property( 3775 valid_cp_range(this_class_index, cp_size) && 3776 cp->tag_at(this_class_index).is_unresolved_klass(), 3777 "Invalid this class index %u in constant pool in class file %s", 3778 this_class_index, CHECK_(nullHandle)); 3779 3780 Symbol* class_name = cp->unresolved_klass_at(this_class_index); 3781 assert(class_name != NULL, "class_name can't be null"); 3782 3783 // It's important to set parsed_name *before* resolving the super class. 3784 // (it's used for cleanup by the caller if parsing fails) 3785 parsed_name = class_name; 3786 // parsed_name is returned and can be used if there's an error, so add to 3787 // its reference count. Caller will decrement the refcount. 3788 parsed_name->increment_refcount(); 3789 3790 // Update _class_name which could be null previously to be class_name 3791 _class_name = class_name; 3792 3793 // Don't need to check whether this class name is legal or not. 3794 // It has been checked when constant pool is parsed. 3795 // However, make sure it is not an array type. 3796 if (_need_verify) { 3797 guarantee_property(class_name->byte_at(0) != JVM_SIGNATURE_ARRAY, 3798 "Bad class name in class file %s", 3799 CHECK_(nullHandle)); 3800 } 3801 3802 Klass* preserve_this_klass; // for storing result across HandleMark 3803 3804 // release all handles when parsing is done 3805 { HandleMark hm(THREAD); 3806 3807 // Checks if name in class file matches requested name 3808 if (name != NULL && class_name != name) { 3809 ResourceMark rm(THREAD); 3810 Exceptions::fthrow( 3811 THREAD_AND_LOCATION, 3812 vmSymbols::java_lang_NoClassDefFoundError(), 3813 "%s (wrong name: %s)", 3814 name->as_C_string(), 3815 class_name->as_C_string() 3816 ); 3817 return nullHandle; 3818 } 3819 3820 if (TraceClassLoadingPreorder) { 3821 tty->print("[Loading %s", (name != NULL) ? name->as_klass_external_name() : "NoName"); 3822 if (cfs->source() != NULL) tty->print(" from %s", cfs->source()); 3823 tty->print_cr("]"); 3824 } 3825 3826 u2 super_class_index = cfs->get_u2_fast(); 3827 instanceKlassHandle super_klass = parse_super_class(super_class_index, 3828 CHECK_NULL); 3829 3830 // Interfaces 3831 u2 itfs_len = cfs->get_u2_fast(); 3832 Array<Klass*>* local_interfaces = 3833 parse_interfaces(itfs_len, protection_domain, _class_name, 3834 &has_default_methods, CHECK_(nullHandle)); 3835 3836 u2 java_fields_count = 0; 3837 // Fields (offsets are filled in later) 3838 FieldAllocationCount fac; 3839 Array<u2>* fields = parse_fields(class_name, 3840 access_flags.is_interface(), 3841 &fac, &java_fields_count, 3842 CHECK_(nullHandle)); 3843 // Methods 3844 bool has_final_method = false; 3845 AccessFlags promoted_flags; 3846 promoted_flags.set_flags(0); 3847 Array<Method*>* methods = parse_methods(access_flags.is_interface(), 3848 &promoted_flags, 3849 &has_final_method, 3850 &has_default_methods, 3851 CHECK_(nullHandle)); 3852 3853 // Additional attributes 3854 ClassAnnotationCollector parsed_annotations; 3855 parse_classfile_attributes(&parsed_annotations, CHECK_(nullHandle)); 3856 3857 // Make sure this is the end of class file stream 3858 guarantee_property(cfs->at_eos(), "Extra bytes at the end of class file %s", CHECK_(nullHandle)); 3859 3860 // We check super class after class file is parsed and format is checked 3861 if (super_class_index > 0 && super_klass.is_null()) { 3862 Symbol* sk = cp->klass_name_at(super_class_index); 3863 if (access_flags.is_interface()) { 3864 // Before attempting to resolve the superclass, check for class format 3865 // errors not checked yet. 3866 guarantee_property(sk == vmSymbols::java_lang_Object(), 3867 "Interfaces must have java.lang.Object as superclass in class file %s", 3868 CHECK_(nullHandle)); 3869 } 3870 Klass* k = SystemDictionary::resolve_super_or_fail(class_name, sk, 3871 class_loader, 3872 protection_domain, 3873 true, 3874 CHECK_(nullHandle)); 3875 3876 KlassHandle kh (THREAD, k); 3877 super_klass = instanceKlassHandle(THREAD, kh()); 3878 } 3879 if (super_klass.not_null()) { 3880 3881 if (super_klass->has_default_methods()) { 3882 has_default_methods = true; 3883 } 3884 3885 if (super_klass->is_interface()) { 3886 ResourceMark rm(THREAD); 3887 Exceptions::fthrow( 3888 THREAD_AND_LOCATION, 3889 vmSymbols::java_lang_IncompatibleClassChangeError(), 3890 "class %s has interface %s as super class", 3891 class_name->as_klass_external_name(), 3892 super_klass->external_name() 3893 ); 3894 return nullHandle; 3895 } 3896 // Make sure super class is not final 3897 if (super_klass->is_final()) { 3898 THROW_MSG_(vmSymbols::java_lang_VerifyError(), "Cannot inherit from final class", nullHandle); 3899 } 3900 } 3901 3902 // save super klass for error handling. 3903 _super_klass = super_klass; 3904 3905 // Compute the transitive list of all unique interfaces implemented by this class 3906 _transitive_interfaces = 3907 compute_transitive_interfaces(super_klass, local_interfaces, CHECK_(nullHandle)); 3908 3909 // sort methods 3910 intArray* method_ordering = sort_methods(methods); 3911 3912 // promote flags from parse_methods() to the klass' flags 3913 access_flags.add_promoted_flags(promoted_flags.as_int()); 3914 3915 // Size of Java vtable (in words) 3916 int vtable_size = 0; 3917 int itable_size = 0; 3918 int num_miranda_methods = 0; 3919 3920 GrowableArray<Method*> all_mirandas(20); 3921 3922 klassVtable::compute_vtable_size_and_num_mirandas( 3923 &vtable_size, &num_miranda_methods, &all_mirandas, super_klass(), methods, 3924 access_flags, class_loader, class_name, local_interfaces, 3925 CHECK_(nullHandle)); 3926 3927 // Size of Java itable (in words) 3928 itable_size = access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); 3929 3930 FieldLayoutInfo info; 3931 layout_fields(class_loader, &fac, &parsed_annotations, &info, CHECK_NULL); 3932 3933 int total_oop_map_size2 = 3934 InstanceKlass::nonstatic_oop_map_size(info.total_oop_map_count); 3935 3936 // Compute reference type 3937 ReferenceType rt; 3938 if (super_klass() == NULL) { 3939 rt = REF_NONE; 3940 } else { 3941 rt = super_klass->reference_type(); 3942 } 3943 3944 // We can now create the basic Klass* for this klass 3945 _klass = InstanceKlass::allocate_instance_klass(loader_data, 3946 vtable_size, 3947 itable_size, 3948 info.static_field_size, 3949 total_oop_map_size2, 3950 rt, 3951 access_flags, 3952 name, 3953 super_klass(), 3954 !host_klass.is_null(), 3955 CHECK_(nullHandle)); 3956 instanceKlassHandle this_klass (THREAD, _klass); 3957 3958 assert(this_klass->static_field_size() == info.static_field_size, "sanity"); 3959 assert(this_klass->nonstatic_oop_map_count() == info.total_oop_map_count, 3960 "sanity"); 3961 3962 // Fill in information already parsed 3963 this_klass->set_should_verify_class(verify); 3964 jint lh = Klass::instance_layout_helper(info.instance_size, false); 3965 this_klass->set_layout_helper(lh); 3966 assert(this_klass->oop_is_instance(), "layout is correct"); 3967 assert(this_klass->size_helper() == info.instance_size, "correct size_helper"); 3968 // Not yet: supers are done below to support the new subtype-checking fields 3969 //this_klass->set_super(super_klass()); 3970 this_klass->set_class_loader_data(loader_data); 3971 this_klass->set_nonstatic_field_size(info.nonstatic_field_size); 3972 this_klass->set_has_nonstatic_fields(info.has_nonstatic_fields); 3973 this_klass->set_static_oop_field_count(fac.count[STATIC_OOP]); 3974 3975 apply_parsed_class_metadata(this_klass, java_fields_count, CHECK_NULL); 3976 3977 if (has_final_method) { 3978 this_klass->set_has_final_method(); 3979 } 3980 this_klass->copy_method_ordering(method_ordering, CHECK_NULL); 3981 // The InstanceKlass::_methods_jmethod_ids cache and the 3982 // InstanceKlass::_methods_cached_itable_indices cache are 3983 // both managed on the assumption that the initial cache 3984 // size is equal to the number of methods in the class. If 3985 // that changes, then InstanceKlass::idnum_can_increment() 3986 // has to be changed accordingly. 3987 this_klass->set_initial_method_idnum(methods->length()); 3988 this_klass->set_name(cp->klass_name_at(this_class_index)); 3989 if (is_anonymous()) // I am well known to myself 3990 cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve 3991 3992 this_klass->set_minor_version(minor_version); 3993 this_klass->set_major_version(major_version); 3994 this_klass->set_has_default_methods(has_default_methods); 3995 3996 // Set up Method*::intrinsic_id as soon as we know the names of methods. 3997 // (We used to do this lazily, but now we query it in Rewriter, 3998 // which is eagerly done for every method, so we might as well do it now, 3999 // when everything is fresh in memory.) 4000 if (Method::klass_id_for_intrinsics(this_klass()) != vmSymbols::NO_SID) { 4001 for (int j = 0; j < methods->length(); j++) { 4002 methods->at(j)->init_intrinsic_id(); 4003 } 4004 } 4005 4006 if (cached_class_file != NULL) { 4007 // JVMTI: we have an InstanceKlass now, tell it about the cached bytes 4008 this_klass->set_cached_class_file(cached_class_file); 4009 } 4010 4011 // Fill in field values obtained by parse_classfile_attributes 4012 if (parsed_annotations.has_any_annotations()) 4013 parsed_annotations.apply_to(this_klass); 4014 apply_parsed_class_attributes(this_klass); 4015 4016 // Miranda methods 4017 if ((num_miranda_methods > 0) || 4018 // if this class introduced new miranda methods or 4019 (super_klass.not_null() && (super_klass->has_miranda_methods())) 4020 // super class exists and this class inherited miranda methods 4021 ) { 4022 this_klass->set_has_miranda_methods(); // then set a flag 4023 } 4024 4025 // Fill in information needed to compute superclasses. 4026 this_klass->initialize_supers(super_klass(), CHECK_(nullHandle)); 4027 4028 // Initialize itable offset tables 4029 klassItable::setup_itable_offset_table(this_klass); 4030 4031 // Compute transitive closure of interfaces this class implements 4032 // Do final class setup 4033 fill_oop_maps(this_klass, info.nonstatic_oop_map_count, info.nonstatic_oop_offsets, info.nonstatic_oop_counts); 4034 4035 // Fill in has_finalizer, has_vanilla_constructor, and layout_helper 4036 set_precomputed_flags(this_klass); 4037 4038 // reinitialize modifiers, using the InnerClasses attribute 4039 int computed_modifiers = this_klass->compute_modifier_flags(CHECK_(nullHandle)); 4040 this_klass->set_modifier_flags(computed_modifiers); 4041 4042 // check if this class can access its super class 4043 check_super_class_access(this_klass, CHECK_(nullHandle)); 4044 4045 // check if this class can access its superinterfaces 4046 check_super_interface_access(this_klass, CHECK_(nullHandle)); 4047 4048 // check if this class overrides any final method 4049 check_final_method_override(this_klass, CHECK_(nullHandle)); 4050 4051 // check that if this class is an interface then it doesn't have static methods 4052 if (this_klass->is_interface()) { 4053 /* An interface in a JAVA 8 classfile can be static */ 4054 if (_major_version < JAVA_8_VERSION) { 4055 check_illegal_static_method(this_klass, CHECK_(nullHandle)); 4056 } 4057 } 4058 4059 // Allocate mirror and initialize static fields 4060 java_lang_Class::create_mirror(this_klass, protection_domain, CHECK_(nullHandle)); 4061 4062 4063 #ifdef ASSERT 4064 if (ParseAllGenericSignatures) { 4065 parseAndPrintGenericSignatures(this_klass, CHECK_(nullHandle)); 4066 } 4067 #endif 4068 4069 // Generate any default methods - default methods are interface methods 4070 // that have a default implementation. This is new with Lambda project. 4071 if (has_default_methods && !access_flags.is_interface() && 4072 local_interfaces->length() > 0) { 4073 DefaultMethods::generate_default_methods( 4074 this_klass(), &all_mirandas, CHECK_(nullHandle)); 4075 } 4076 4077 // Update the loader_data graph. 4078 record_defined_class_dependencies(this_klass, CHECK_NULL); 4079 4080 ClassLoadingService::notify_class_loaded(InstanceKlass::cast(this_klass()), 4081 false /* not shared class */); 4082 4083 if (TraceClassLoading) { 4084 ResourceMark rm; 4085 // print in a single call to reduce interleaving of output 4086 if (cfs->source() != NULL) { 4087 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4088 cfs->source()); 4089 } else if (class_loader.is_null()) { 4090 if (THREAD->is_Java_thread()) { 4091 Klass* caller = ((JavaThread*)THREAD)->security_get_caller_class(1); 4092 tty->print("[Loaded %s by instance of %s]\n", 4093 this_klass->external_name(), 4094 InstanceKlass::cast(caller)->external_name()); 4095 } else { 4096 tty->print("[Loaded %s]\n", this_klass->external_name()); 4097 } 4098 } else { 4099 tty->print("[Loaded %s from %s]\n", this_klass->external_name(), 4100 InstanceKlass::cast(class_loader->klass())->external_name()); 4101 } 4102 } 4103 4104 if (TraceClassResolution) { 4105 ResourceMark rm; 4106 // print out the superclass. 4107 const char * from = this_klass()->external_name(); 4108 if (this_klass->java_super() != NULL) { 4109 tty->print("RESOLVE %s %s (super)\n", from, InstanceKlass::cast(this_klass->java_super())->external_name()); 4110 } 4111 // print out each of the interface classes referred to by this class. 4112 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4113 if (local_interfaces != NULL) { 4114 int length = local_interfaces->length(); 4115 for (int i = 0; i < length; i++) { 4116 Klass* k = local_interfaces->at(i); 4117 InstanceKlass* to_class = InstanceKlass::cast(k); 4118 const char * to = to_class->external_name(); 4119 tty->print("RESOLVE %s %s (interface)\n", from, to); 4120 } 4121 } 4122 } 4123 4124 // preserve result across HandleMark 4125 preserve_this_klass = this_klass(); 4126 } 4127 4128 // Create new handle outside HandleMark (might be needed for 4129 // Extended Class Redefinition) 4130 instanceKlassHandle this_klass (THREAD, preserve_this_klass); 4131 debug_only(this_klass->verify();) 4132 4133 // Clear class if no error has occurred so destructor doesn't deallocate it 4134 _klass = NULL; 4135 return this_klass; 4136 } 4137 4138 // Destructor to clean up if there's an error 4139 ClassFileParser::~ClassFileParser() { 4140 MetadataFactory::free_metadata(_loader_data, _cp); 4141 MetadataFactory::free_array<u2>(_loader_data, _fields); 4142 4143 // Free methods 4144 InstanceKlass::deallocate_methods(_loader_data, _methods); 4145 4146 // beware of the Universe::empty_blah_array!! 4147 if (_inner_classes != Universe::the_empty_short_array()) { 4148 MetadataFactory::free_array<u2>(_loader_data, _inner_classes); 4149 } 4150 4151 // Free interfaces 4152 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass(), 4153 _local_interfaces, _transitive_interfaces); 4154 4155 MetadataFactory::free_array<u1>(_loader_data, _annotations); 4156 MetadataFactory::free_array<u1>(_loader_data, _type_annotations); 4157 Annotations::free_contents(_loader_data, _fields_annotations); 4158 Annotations::free_contents(_loader_data, _fields_type_annotations); 4159 4160 clear_class_metadata(); 4161 4162 // deallocate the klass if already created. 4163 MetadataFactory::free_metadata(_loader_data, _klass); 4164 _klass = NULL; 4165 } 4166 4167 void ClassFileParser::print_field_layout(Symbol* name, 4168 Array<u2>* fields, 4169 constantPoolHandle cp, 4170 int instance_size, 4171 int instance_fields_start, 4172 int instance_fields_end, 4173 int static_fields_end) { 4174 tty->print("%s: field layout\n", name->as_klass_external_name()); 4175 tty->print(" @%3d %s\n", instance_fields_start, "--- instance fields start ---"); 4176 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4177 if (!fs.access_flags().is_static()) { 4178 tty->print(" @%3d \"%s\" %s\n", 4179 fs.offset(), 4180 fs.name()->as_klass_external_name(), 4181 fs.signature()->as_klass_external_name()); 4182 } 4183 } 4184 tty->print(" @%3d %s\n", instance_fields_end, "--- instance fields end ---"); 4185 tty->print(" @%3d %s\n", instance_size * wordSize, "--- instance ends ---"); 4186 tty->print(" @%3d %s\n", InstanceMirrorKlass::offset_of_static_fields(), "--- static fields start ---"); 4187 for (AllFieldStream fs(fields, cp); !fs.done(); fs.next()) { 4188 if (fs.access_flags().is_static()) { 4189 tty->print(" @%3d \"%s\" %s\n", 4190 fs.offset(), 4191 fs.name()->as_klass_external_name(), 4192 fs.signature()->as_klass_external_name()); 4193 } 4194 } 4195 tty->print(" @%3d %s\n", static_fields_end, "--- static fields end ---"); 4196 tty->print("\n"); 4197 } 4198 4199 unsigned int 4200 ClassFileParser::compute_oop_map_count(instanceKlassHandle super, 4201 unsigned int nonstatic_oop_map_count, 4202 int first_nonstatic_oop_offset) { 4203 unsigned int map_count = 4204 super.is_null() ? 0 : super->nonstatic_oop_map_count(); 4205 if (nonstatic_oop_map_count > 0) { 4206 // We have oops to add to map 4207 if (map_count == 0) { 4208 map_count = nonstatic_oop_map_count; 4209 } else { 4210 // Check whether we should add a new map block or whether the last one can 4211 // be extended 4212 OopMapBlock* const first_map = super->start_of_nonstatic_oop_maps(); 4213 OopMapBlock* const last_map = first_map + map_count - 1; 4214 4215 int next_offset = last_map->offset() + last_map->count() * heapOopSize; 4216 if (next_offset == first_nonstatic_oop_offset) { 4217 // There is no gap bettwen superklass's last oop field and first 4218 // local oop field, merge maps. 4219 nonstatic_oop_map_count -= 1; 4220 } else { 4221 // Superklass didn't end with a oop field, add extra maps 4222 assert(next_offset < first_nonstatic_oop_offset, "just checking"); 4223 } 4224 map_count += nonstatic_oop_map_count; 4225 } 4226 } 4227 return map_count; 4228 } 4229 4230 4231 void ClassFileParser::fill_oop_maps(instanceKlassHandle k, 4232 unsigned int nonstatic_oop_map_count, 4233 int* nonstatic_oop_offsets, 4234 unsigned int* nonstatic_oop_counts) { 4235 OopMapBlock* this_oop_map = k->start_of_nonstatic_oop_maps(); 4236 const InstanceKlass* const super = k->superklass(); 4237 const unsigned int super_count = super ? super->nonstatic_oop_map_count() : 0; 4238 if (super_count > 0) { 4239 // Copy maps from superklass 4240 OopMapBlock* super_oop_map = super->start_of_nonstatic_oop_maps(); 4241 for (unsigned int i = 0; i < super_count; ++i) { 4242 *this_oop_map++ = *super_oop_map++; 4243 } 4244 } 4245 4246 if (nonstatic_oop_map_count > 0) { 4247 if (super_count + nonstatic_oop_map_count > k->nonstatic_oop_map_count()) { 4248 // The counts differ because there is no gap between superklass's last oop 4249 // field and the first local oop field. Extend the last oop map copied 4250 // from the superklass instead of creating new one. 4251 nonstatic_oop_map_count--; 4252 nonstatic_oop_offsets++; 4253 this_oop_map--; 4254 this_oop_map->set_count(this_oop_map->count() + *nonstatic_oop_counts++); 4255 this_oop_map++; 4256 } 4257 4258 // Add new map blocks, fill them 4259 while (nonstatic_oop_map_count-- > 0) { 4260 this_oop_map->set_offset(*nonstatic_oop_offsets++); 4261 this_oop_map->set_count(*nonstatic_oop_counts++); 4262 this_oop_map++; 4263 } 4264 assert(k->start_of_nonstatic_oop_maps() + k->nonstatic_oop_map_count() == 4265 this_oop_map, "sanity"); 4266 } 4267 } 4268 4269 4270 void ClassFileParser::set_precomputed_flags(instanceKlassHandle k) { 4271 Klass* super = k->super(); 4272 4273 // Check if this klass has an empty finalize method (i.e. one with return bytecode only), 4274 // in which case we don't have to register objects as finalizable 4275 if (!_has_empty_finalizer) { 4276 if (_has_finalizer || 4277 (super != NULL && super->has_finalizer())) { 4278 k->set_has_finalizer(); 4279 } 4280 } 4281 4282 #ifdef ASSERT 4283 bool f = false; 4284 Method* m = k->lookup_method(vmSymbols::finalize_method_name(), 4285 vmSymbols::void_method_signature()); 4286 if (m != NULL && !m->is_empty_method()) { 4287 f = true; 4288 } 4289 assert(f == k->has_finalizer(), "inconsistent has_finalizer"); 4290 #endif 4291 4292 // Check if this klass supports the java.lang.Cloneable interface 4293 if (SystemDictionary::Cloneable_klass_loaded()) { 4294 if (k->is_subtype_of(SystemDictionary::Cloneable_klass())) { 4295 k->set_is_cloneable(); 4296 } 4297 } 4298 4299 // Check if this klass has a vanilla default constructor 4300 if (super == NULL) { 4301 // java.lang.Object has empty default constructor 4302 k->set_has_vanilla_constructor(); 4303 } else { 4304 if (super->has_vanilla_constructor() && 4305 _has_vanilla_constructor) { 4306 k->set_has_vanilla_constructor(); 4307 } 4308 #ifdef ASSERT 4309 bool v = false; 4310 if (super->has_vanilla_constructor()) { 4311 Method* constructor = k->find_method(vmSymbols::object_initializer_name( 4312 ), vmSymbols::void_method_signature()); 4313 if (constructor != NULL && constructor->is_vanilla_constructor()) { 4314 v = true; 4315 } 4316 } 4317 assert(v == k->has_vanilla_constructor(), "inconsistent has_vanilla_constructor"); 4318 #endif 4319 } 4320 4321 // If it cannot be fast-path allocated, set a bit in the layout helper. 4322 // See documentation of InstanceKlass::can_be_fastpath_allocated(). 4323 assert(k->size_helper() > 0, "layout_helper is initialized"); 4324 if ((!RegisterFinalizersAtInit && k->has_finalizer()) 4325 || k->is_abstract() || k->is_interface() 4326 || (k->name() == vmSymbols::java_lang_Class() && k->class_loader() == NULL) 4327 || k->size_helper() >= FastAllocateSizeLimit) { 4328 // Forbid fast-path allocation. 4329 jint lh = Klass::instance_layout_helper(k->size_helper(), true); 4330 k->set_layout_helper(lh); 4331 } 4332 } 4333 4334 // Attach super classes and interface classes to class loader data 4335 void ClassFileParser::record_defined_class_dependencies(instanceKlassHandle defined_klass, TRAPS) { 4336 ClassLoaderData * defining_loader_data = defined_klass->class_loader_data(); 4337 if (defining_loader_data->is_the_null_class_loader_data()) { 4338 // Dependencies to null class loader data are implicit. 4339 return; 4340 } else { 4341 // add super class dependency 4342 Klass* super = defined_klass->super(); 4343 if (super != NULL) { 4344 defining_loader_data->record_dependency(super, CHECK); 4345 } 4346 4347 // add super interface dependencies 4348 Array<Klass*>* local_interfaces = defined_klass->local_interfaces(); 4349 if (local_interfaces != NULL) { 4350 int length = local_interfaces->length(); 4351 for (int i = 0; i < length; i++) { 4352 defining_loader_data->record_dependency(local_interfaces->at(i), CHECK); 4353 } 4354 } 4355 } 4356 } 4357 4358 // utility methods for appending an array with check for duplicates 4359 4360 void append_interfaces(GrowableArray<Klass*>* result, Array<Klass*>* ifs) { 4361 // iterate over new interfaces 4362 for (int i = 0; i < ifs->length(); i++) { 4363 Klass* e = ifs->at(i); 4364 assert(e->is_klass() && InstanceKlass::cast(e)->is_interface(), "just checking"); 4365 // add new interface 4366 result->append_if_missing(e); 4367 } 4368 } 4369 4370 Array<Klass*>* ClassFileParser::compute_transitive_interfaces( 4371 instanceKlassHandle super, 4372 Array<Klass*>* local_ifs, TRAPS) { 4373 // Compute maximum size for transitive interfaces 4374 int max_transitive_size = 0; 4375 int super_size = 0; 4376 // Add superclass transitive interfaces size 4377 if (super.not_null()) { 4378 super_size = super->transitive_interfaces()->length(); 4379 max_transitive_size += super_size; 4380 } 4381 // Add local interfaces' super interfaces 4382 int local_size = local_ifs->length(); 4383 for (int i = 0; i < local_size; i++) { 4384 Klass* l = local_ifs->at(i); 4385 max_transitive_size += InstanceKlass::cast(l)->transitive_interfaces()->length(); 4386 } 4387 // Finally add local interfaces 4388 max_transitive_size += local_size; 4389 // Construct array 4390 if (max_transitive_size == 0) { 4391 // no interfaces, use canonicalized array 4392 return Universe::the_empty_klass_array(); 4393 } else if (max_transitive_size == super_size) { 4394 // no new local interfaces added, share superklass' transitive interface array 4395 return super->transitive_interfaces(); 4396 } else if (max_transitive_size == local_size) { 4397 // only local interfaces added, share local interface array 4398 return local_ifs; 4399 } else { 4400 ResourceMark rm; 4401 GrowableArray<Klass*>* result = new GrowableArray<Klass*>(max_transitive_size); 4402 4403 // Copy down from superclass 4404 if (super.not_null()) { 4405 append_interfaces(result, super->transitive_interfaces()); 4406 } 4407 4408 // Copy down from local interfaces' superinterfaces 4409 for (int i = 0; i < local_ifs->length(); i++) { 4410 Klass* l = local_ifs->at(i); 4411 append_interfaces(result, InstanceKlass::cast(l)->transitive_interfaces()); 4412 } 4413 // Finally add local interfaces 4414 append_interfaces(result, local_ifs); 4415 4416 // length will be less than the max_transitive_size if duplicates were removed 4417 int length = result->length(); 4418 assert(length <= max_transitive_size, "just checking"); 4419 Array<Klass*>* new_result = MetadataFactory::new_array<Klass*>(_loader_data, length, CHECK_NULL); 4420 for (int i = 0; i < length; i++) { 4421 Klass* e = result->at(i); 4422 assert(e != NULL, "just checking"); 4423 new_result->at_put(i, e); 4424 } 4425 return new_result; 4426 } 4427 } 4428 4429 void ClassFileParser::check_super_class_access(instanceKlassHandle this_klass, TRAPS) { 4430 Klass* super = this_klass->super(); 4431 if ((super != NULL) && 4432 (!Reflection::verify_class_access(this_klass(), super, false))) { 4433 ResourceMark rm(THREAD); 4434 Exceptions::fthrow( 4435 THREAD_AND_LOCATION, 4436 vmSymbols::java_lang_IllegalAccessError(), 4437 "class %s cannot access its superclass %s", 4438 this_klass->external_name(), 4439 InstanceKlass::cast(super)->external_name() 4440 ); 4441 return; 4442 } 4443 } 4444 4445 4446 void ClassFileParser::check_super_interface_access(instanceKlassHandle this_klass, TRAPS) { 4447 Array<Klass*>* local_interfaces = this_klass->local_interfaces(); 4448 int lng = local_interfaces->length(); 4449 for (int i = lng - 1; i >= 0; i--) { 4450 Klass* k = local_interfaces->at(i); 4451 assert (k != NULL && k->is_interface(), "invalid interface"); 4452 if (!Reflection::verify_class_access(this_klass(), k, false)) { 4453 ResourceMark rm(THREAD); 4454 Exceptions::fthrow( 4455 THREAD_AND_LOCATION, 4456 vmSymbols::java_lang_IllegalAccessError(), 4457 "class %s cannot access its superinterface %s", 4458 this_klass->external_name(), 4459 InstanceKlass::cast(k)->external_name() 4460 ); 4461 return; 4462 } 4463 } 4464 } 4465 4466 4467 void ClassFileParser::check_final_method_override(instanceKlassHandle this_klass, TRAPS) { 4468 Array<Method*>* methods = this_klass->methods(); 4469 int num_methods = methods->length(); 4470 4471 // go thru each method and check if it overrides a final method 4472 for (int index = 0; index < num_methods; index++) { 4473 Method* m = methods->at(index); 4474 4475 // skip private, static and <init> methods 4476 if ((!m->is_private()) && 4477 (!m->is_static()) && 4478 (m->name() != vmSymbols::object_initializer_name())) { 4479 4480 Symbol* name = m->name(); 4481 Symbol* signature = m->signature(); 4482 Klass* k = this_klass->super(); 4483 Method* super_m = NULL; 4484 while (k != NULL) { 4485 // skip supers that don't have final methods. 4486 if (k->has_final_method()) { 4487 // lookup a matching method in the super class hierarchy 4488 super_m = InstanceKlass::cast(k)->lookup_method(name, signature); 4489 if (super_m == NULL) { 4490 break; // didn't find any match; get out 4491 } 4492 4493 if (super_m->is_final() && 4494 // matching method in super is final 4495 (Reflection::verify_field_access(this_klass(), 4496 super_m->method_holder(), 4497 super_m->method_holder(), 4498 super_m->access_flags(), false)) 4499 // this class can access super final method and therefore override 4500 ) { 4501 ResourceMark rm(THREAD); 4502 Exceptions::fthrow( 4503 THREAD_AND_LOCATION, 4504 vmSymbols::java_lang_VerifyError(), 4505 "class %s overrides final method %s.%s", 4506 this_klass->external_name(), 4507 name->as_C_string(), 4508 signature->as_C_string() 4509 ); 4510 return; 4511 } 4512 4513 // continue to look from super_m's holder's super. 4514 k = super_m->method_holder()->super(); 4515 continue; 4516 } 4517 4518 k = k->super(); 4519 } 4520 } 4521 } 4522 } 4523 4524 4525 // assumes that this_klass is an interface 4526 void ClassFileParser::check_illegal_static_method(instanceKlassHandle this_klass, TRAPS) { 4527 assert(this_klass->is_interface(), "not an interface"); 4528 Array<Method*>* methods = this_klass->methods(); 4529 int num_methods = methods->length(); 4530 4531 for (int index = 0; index < num_methods; index++) { 4532 Method* m = methods->at(index); 4533 // if m is static and not the init method, throw a verify error 4534 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { 4535 ResourceMark rm(THREAD); 4536 Exceptions::fthrow( 4537 THREAD_AND_LOCATION, 4538 vmSymbols::java_lang_VerifyError(), 4539 "Illegal static method %s in interface %s", 4540 m->name()->as_C_string(), 4541 this_klass->external_name() 4542 ); 4543 return; 4544 } 4545 } 4546 } 4547 4548 // utility methods for format checking 4549 4550 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) { 4551 if (!_need_verify) { return; } 4552 4553 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; 4554 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4555 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4556 const bool is_super = (flags & JVM_ACC_SUPER) != 0; 4557 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4558 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; 4559 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4560 4561 if ((is_abstract && is_final) || 4562 (is_interface && !is_abstract) || 4563 (is_interface && major_gte_15 && (is_super || is_enum)) || 4564 (!is_interface && major_gte_15 && is_annotation)) { 4565 ResourceMark rm(THREAD); 4566 Exceptions::fthrow( 4567 THREAD_AND_LOCATION, 4568 vmSymbols::java_lang_ClassFormatError(), 4569 "Illegal class modifiers in class %s: 0x%X", 4570 _class_name->as_C_string(), flags 4571 ); 4572 return; 4573 } 4574 } 4575 4576 bool ClassFileParser::has_illegal_visibility(jint flags) { 4577 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4578 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4579 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4580 4581 return ((is_public && is_protected) || 4582 (is_public && is_private) || 4583 (is_protected && is_private)); 4584 } 4585 4586 bool ClassFileParser::is_supported_version(u2 major, u2 minor) { 4587 u2 max_version = 4588 JDK_Version::is_gte_jdk17x_version() ? JAVA_MAX_SUPPORTED_VERSION : 4589 (JDK_Version::is_gte_jdk16x_version() ? JAVA_6_VERSION : JAVA_1_5_VERSION); 4590 return (major >= JAVA_MIN_SUPPORTED_VERSION) && 4591 (major <= max_version) && 4592 ((major != max_version) || 4593 (minor <= JAVA_MAX_SUPPORTED_MINOR_VERSION)); 4594 } 4595 4596 void ClassFileParser::verify_legal_field_modifiers( 4597 jint flags, bool is_interface, TRAPS) { 4598 if (!_need_verify) { return; } 4599 4600 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4601 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4602 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4603 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4604 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4605 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; 4606 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; 4607 const bool is_enum = (flags & JVM_ACC_ENUM) != 0; 4608 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4609 4610 bool is_illegal = false; 4611 4612 if (is_interface) { 4613 if (!is_public || !is_static || !is_final || is_private || 4614 is_protected || is_volatile || is_transient || 4615 (major_gte_15 && is_enum)) { 4616 is_illegal = true; 4617 } 4618 } else { // not interface 4619 if (has_illegal_visibility(flags) || (is_final && is_volatile)) { 4620 is_illegal = true; 4621 } 4622 } 4623 4624 if (is_illegal) { 4625 ResourceMark rm(THREAD); 4626 Exceptions::fthrow( 4627 THREAD_AND_LOCATION, 4628 vmSymbols::java_lang_ClassFormatError(), 4629 "Illegal field modifiers in class %s: 0x%X", 4630 _class_name->as_C_string(), flags); 4631 return; 4632 } 4633 } 4634 4635 void ClassFileParser::verify_legal_method_modifiers( 4636 jint flags, bool is_interface, Symbol* name, TRAPS) { 4637 if (!_need_verify) { return; } 4638 4639 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; 4640 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; 4641 const bool is_static = (flags & JVM_ACC_STATIC) != 0; 4642 const bool is_final = (flags & JVM_ACC_FINAL) != 0; 4643 const bool is_native = (flags & JVM_ACC_NATIVE) != 0; 4644 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; 4645 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; 4646 const bool is_strict = (flags & JVM_ACC_STRICT) != 0; 4647 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; 4648 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; 4649 const bool major_gte_15 = _major_version >= JAVA_1_5_VERSION; 4650 const bool major_gte_8 = _major_version >= JAVA_8_VERSION; 4651 const bool is_initializer = (name == vmSymbols::object_initializer_name()); 4652 4653 bool is_illegal = false; 4654 4655 if (is_interface) { 4656 if (major_gte_8) { 4657 // Class file version is JAVA_8_VERSION or later Methods of 4658 // interfaces may set any of the flags except ACC_PROTECTED, 4659 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must 4660 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. 4661 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ 4662 (is_native || is_protected || is_final || is_synchronized) || 4663 // If a specific method of a class or interface has its 4664 // ACC_ABSTRACT flag set, it must not have any of its 4665 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, 4666 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to 4667 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as 4668 // those flags are illegal irrespective of ACC_ABSTRACT being set or not. 4669 (is_abstract && (is_private || is_static || is_strict))) { 4670 is_illegal = true; 4671 } 4672 } else if (major_gte_15) { 4673 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) 4674 if (!is_public || is_static || is_final || is_synchronized || 4675 is_native || !is_abstract || is_strict) { 4676 is_illegal = true; 4677 } 4678 } else { 4679 // Class file version is pre-JAVA_1_5_VERSION 4680 if (!is_public || is_static || is_final || is_native || !is_abstract) { 4681 is_illegal = true; 4682 } 4683 } 4684 } else { // not interface 4685 if (is_initializer) { 4686 if (is_static || is_final || is_synchronized || is_native || 4687 is_abstract || (major_gte_15 && is_bridge)) { 4688 is_illegal = true; 4689 } 4690 } else { // not initializer 4691 if (is_abstract) { 4692 if ((is_final || is_native || is_private || is_static || 4693 (major_gte_15 && (is_synchronized || is_strict)))) { 4694 is_illegal = true; 4695 } 4696 } 4697 if (has_illegal_visibility(flags)) { 4698 is_illegal = true; 4699 } 4700 } 4701 } 4702 4703 if (is_illegal) { 4704 ResourceMark rm(THREAD); 4705 Exceptions::fthrow( 4706 THREAD_AND_LOCATION, 4707 vmSymbols::java_lang_ClassFormatError(), 4708 "Method %s in class %s has illegal modifiers: 0x%X", 4709 name->as_C_string(), _class_name->as_C_string(), flags); 4710 return; 4711 } 4712 } 4713 4714 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) { 4715 assert(_need_verify, "only called when _need_verify is true"); 4716 int i = 0; 4717 int count = length >> 2; 4718 for (int k=0; k<count; k++) { 4719 unsigned char b0 = buffer[i]; 4720 unsigned char b1 = buffer[i+1]; 4721 unsigned char b2 = buffer[i+2]; 4722 unsigned char b3 = buffer[i+3]; 4723 // For an unsigned char v, 4724 // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128; 4725 // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128. 4726 unsigned char res = b0 | b0 - 1 | 4727 b1 | b1 - 1 | 4728 b2 | b2 - 1 | 4729 b3 | b3 - 1; 4730 if (res >= 128) break; 4731 i += 4; 4732 } 4733 for(; i < length; i++) { 4734 unsigned short c; 4735 // no embedded zeros 4736 guarantee_property((buffer[i] != 0), "Illegal UTF8 string in constant pool in class file %s", CHECK); 4737 if(buffer[i] < 128) { 4738 continue; 4739 } 4740 if ((i + 5) < length) { // see if it's legal supplementary character 4741 if (UTF8::is_supplementary_character(&buffer[i])) { 4742 c = UTF8::get_supplementary_character(&buffer[i]); 4743 i += 5; 4744 continue; 4745 } 4746 } 4747 switch (buffer[i] >> 4) { 4748 default: break; 4749 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF: 4750 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4751 case 0xC: case 0xD: // 110xxxxx 10xxxxxx 4752 c = (buffer[i] & 0x1F) << 6; 4753 i++; 4754 if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) { 4755 c += buffer[i] & 0x3F; 4756 if (_major_version <= 47 || c == 0 || c >= 0x80) { 4757 // for classes with major > 47, c must a null or a character in its shortest form 4758 break; 4759 } 4760 } 4761 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4762 case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx 4763 c = (buffer[i] & 0xF) << 12; 4764 i += 2; 4765 if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) { 4766 c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F); 4767 if (_major_version <= 47 || c >= 0x800) { 4768 // for classes with major > 47, c must be in its shortest form 4769 break; 4770 } 4771 } 4772 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", CHECK); 4773 } // end of switch 4774 } // end of for 4775 } 4776 4777 // Checks if name is a legal class name. 4778 void ClassFileParser::verify_legal_class_name(Symbol* name, TRAPS) { 4779 if (!_need_verify || _relax_verify) { return; } 4780 4781 char buf[fixed_buffer_size]; 4782 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4783 unsigned int length = name->utf8_length(); 4784 bool legal = false; 4785 4786 if (length > 0) { 4787 char* p; 4788 if (bytes[0] == JVM_SIGNATURE_ARRAY) { 4789 p = skip_over_field_signature(bytes, false, length, CHECK); 4790 legal = (p != NULL) && ((p - bytes) == (int)length); 4791 } else if (_major_version < JAVA_1_5_VERSION) { 4792 if (bytes[0] != '<') { 4793 p = skip_over_field_name(bytes, true, length); 4794 legal = (p != NULL) && ((p - bytes) == (int)length); 4795 } 4796 } else { 4797 // 4900761: relax the constraints based on JSR202 spec 4798 // Class names may be drawn from the entire Unicode character set. 4799 // Identifiers between '/' must be unqualified names. 4800 // The utf8 string has been verified when parsing cpool entries. 4801 legal = verify_unqualified_name(bytes, length, LegalClass); 4802 } 4803 } 4804 if (!legal) { 4805 ResourceMark rm(THREAD); 4806 Exceptions::fthrow( 4807 THREAD_AND_LOCATION, 4808 vmSymbols::java_lang_ClassFormatError(), 4809 "Illegal class name \"%s\" in class file %s", bytes, 4810 _class_name->as_C_string() 4811 ); 4812 return; 4813 } 4814 } 4815 4816 // Checks if name is a legal field name. 4817 void ClassFileParser::verify_legal_field_name(Symbol* name, TRAPS) { 4818 if (!_need_verify || _relax_verify) { return; } 4819 4820 char buf[fixed_buffer_size]; 4821 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4822 unsigned int length = name->utf8_length(); 4823 bool legal = false; 4824 4825 if (length > 0) { 4826 if (_major_version < JAVA_1_5_VERSION) { 4827 if (bytes[0] != '<') { 4828 char* p = skip_over_field_name(bytes, false, length); 4829 legal = (p != NULL) && ((p - bytes) == (int)length); 4830 } 4831 } else { 4832 // 4881221: relax the constraints based on JSR202 spec 4833 legal = verify_unqualified_name(bytes, length, LegalField); 4834 } 4835 } 4836 4837 if (!legal) { 4838 ResourceMark rm(THREAD); 4839 Exceptions::fthrow( 4840 THREAD_AND_LOCATION, 4841 vmSymbols::java_lang_ClassFormatError(), 4842 "Illegal field name \"%s\" in class %s", bytes, 4843 _class_name->as_C_string() 4844 ); 4845 return; 4846 } 4847 } 4848 4849 // Checks if name is a legal method name. 4850 void ClassFileParser::verify_legal_method_name(Symbol* name, TRAPS) { 4851 if (!_need_verify || _relax_verify) { return; } 4852 4853 assert(name != NULL, "method name is null"); 4854 char buf[fixed_buffer_size]; 4855 char* bytes = name->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4856 unsigned int length = name->utf8_length(); 4857 bool legal = false; 4858 4859 if (length > 0) { 4860 if (bytes[0] == '<') { 4861 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { 4862 legal = true; 4863 } 4864 } else if (_major_version < JAVA_1_5_VERSION) { 4865 char* p; 4866 p = skip_over_field_name(bytes, false, length); 4867 legal = (p != NULL) && ((p - bytes) == (int)length); 4868 } else { 4869 // 4881221: relax the constraints based on JSR202 spec 4870 legal = verify_unqualified_name(bytes, length, LegalMethod); 4871 } 4872 } 4873 4874 if (!legal) { 4875 ResourceMark rm(THREAD); 4876 Exceptions::fthrow( 4877 THREAD_AND_LOCATION, 4878 vmSymbols::java_lang_ClassFormatError(), 4879 "Illegal method name \"%s\" in class %s", bytes, 4880 _class_name->as_C_string() 4881 ); 4882 return; 4883 } 4884 } 4885 4886 4887 // Checks if signature is a legal field signature. 4888 void ClassFileParser::verify_legal_field_signature(Symbol* name, Symbol* signature, TRAPS) { 4889 if (!_need_verify) { return; } 4890 4891 char buf[fixed_buffer_size]; 4892 char* bytes = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4893 unsigned int length = signature->utf8_length(); 4894 char* p = skip_over_field_signature(bytes, false, length, CHECK); 4895 4896 if (p == NULL || (p - bytes) != (int)length) { 4897 throwIllegalSignature("Field", name, signature, CHECK); 4898 } 4899 } 4900 4901 // Checks if signature is a legal method signature. 4902 // Returns number of parameters 4903 int ClassFileParser::verify_legal_method_signature(Symbol* name, Symbol* signature, TRAPS) { 4904 if (!_need_verify) { 4905 // make sure caller's args_size will be less than 0 even for non-static 4906 // method so it will be recomputed in compute_size_of_parameters(). 4907 return -2; 4908 } 4909 4910 unsigned int args_size = 0; 4911 char buf[fixed_buffer_size]; 4912 char* p = signature->as_utf8_flexible_buffer(THREAD, buf, fixed_buffer_size); 4913 unsigned int length = signature->utf8_length(); 4914 char* nextp; 4915 4916 // The first character must be a '(' 4917 if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { 4918 length--; 4919 // Skip over legal field signatures 4920 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4921 while ((length > 0) && (nextp != NULL)) { 4922 args_size++; 4923 if (p[0] == 'J' || p[0] == 'D') { 4924 args_size++; 4925 } 4926 length -= nextp - p; 4927 p = nextp; 4928 nextp = skip_over_field_signature(p, false, length, CHECK_0); 4929 } 4930 // The first non-signature thing better be a ')' 4931 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { 4932 length--; 4933 if (name->utf8_length() > 0 && name->byte_at(0) == '<') { 4934 // All internal methods must return void 4935 if ((length == 1) && (p[0] == JVM_SIGNATURE_VOID)) { 4936 return args_size; 4937 } 4938 } else { 4939 // Now we better just have a return value 4940 nextp = skip_over_field_signature(p, true, length, CHECK_0); 4941 if (nextp && ((int)length == (nextp - p))) { 4942 return args_size; 4943 } 4944 } 4945 } 4946 } 4947 // Report error 4948 throwIllegalSignature("Method", name, signature, CHECK_0); 4949 return 0; 4950 } 4951 4952 4953 // Unqualified names may not contain the characters '.', ';', '[', or '/'. 4954 // Method names also may not contain the characters '<' or '>', unless <init> 4955 // or <clinit>. Note that method names may not be <init> or <clinit> in this 4956 // method. Because these names have been checked as special cases before 4957 // calling this method in verify_legal_method_name. 4958 bool ClassFileParser::verify_unqualified_name( 4959 char* name, unsigned int length, int type) { 4960 jchar ch; 4961 4962 for (char* p = name; p != name + length; ) { 4963 ch = *p; 4964 if (ch < 128) { 4965 p++; 4966 if (ch == '.' || ch == ';' || ch == '[' ) { 4967 return false; // do not permit '.', ';', or '[' 4968 } 4969 if (type != LegalClass && ch == '/') { 4970 return false; // do not permit '/' unless it's class name 4971 } 4972 if (type == LegalMethod && (ch == '<' || ch == '>')) { 4973 return false; // do not permit '<' or '>' in method names 4974 } 4975 } else { 4976 char* tmp_p = UTF8::next(p, &ch); 4977 p = tmp_p; 4978 } 4979 } 4980 return true; 4981 } 4982 4983 4984 // Take pointer to a string. Skip over the longest part of the string that could 4985 // be taken as a fieldname. Allow '/' if slash_ok is true. 4986 // Return a pointer to just past the fieldname. 4987 // Return NULL if no fieldname at all was found, or in the case of slash_ok 4988 // being true, we saw consecutive slashes (meaning we were looking for a 4989 // qualified path but found something that was badly-formed). 4990 char* ClassFileParser::skip_over_field_name(char* name, bool slash_ok, unsigned int length) { 4991 char* p; 4992 jchar ch; 4993 jboolean last_is_slash = false; 4994 jboolean not_first_ch = false; 4995 4996 for (p = name; p != name + length; not_first_ch = true) { 4997 char* old_p = p; 4998 ch = *p; 4999 if (ch < 128) { 5000 p++; 5001 // quick check for ascii 5002 if ((ch >= 'a' && ch <= 'z') || 5003 (ch >= 'A' && ch <= 'Z') || 5004 (ch == '_' || ch == '$') || 5005 (not_first_ch && ch >= '0' && ch <= '9')) { 5006 last_is_slash = false; 5007 continue; 5008 } 5009 if (slash_ok && ch == '/') { 5010 if (last_is_slash) { 5011 return NULL; // Don't permit consecutive slashes 5012 } 5013 last_is_slash = true; 5014 continue; 5015 } 5016 } else { 5017 jint unicode_ch; 5018 char* tmp_p = UTF8::next_character(p, &unicode_ch); 5019 p = tmp_p; 5020 last_is_slash = false; 5021 // Check if ch is Java identifier start or is Java identifier part 5022 // 4672820: call java.lang.Character methods directly without generating separate tables. 5023 EXCEPTION_MARK; 5024 instanceKlassHandle klass (THREAD, SystemDictionary::Character_klass()); 5025 5026 // return value 5027 JavaValue result(T_BOOLEAN); 5028 // Set up the arguments to isJavaIdentifierStart and isJavaIdentifierPart 5029 JavaCallArguments args; 5030 args.push_int(unicode_ch); 5031 5032 // public static boolean isJavaIdentifierStart(char ch); 5033 JavaCalls::call_static(&result, 5034 klass, 5035 vmSymbols::isJavaIdentifierStart_name(), 5036 vmSymbols::int_bool_signature(), 5037 &args, 5038 THREAD); 5039 5040 if (HAS_PENDING_EXCEPTION) { 5041 CLEAR_PENDING_EXCEPTION; 5042 return 0; 5043 } 5044 if (result.get_jboolean()) { 5045 continue; 5046 } 5047 5048 if (not_first_ch) { 5049 // public static boolean isJavaIdentifierPart(char ch); 5050 JavaCalls::call_static(&result, 5051 klass, 5052 vmSymbols::isJavaIdentifierPart_name(), 5053 vmSymbols::int_bool_signature(), 5054 &args, 5055 THREAD); 5056 5057 if (HAS_PENDING_EXCEPTION) { 5058 CLEAR_PENDING_EXCEPTION; 5059 return 0; 5060 } 5061 5062 if (result.get_jboolean()) { 5063 continue; 5064 } 5065 } 5066 } 5067 return (not_first_ch) ? old_p : NULL; 5068 } 5069 return (not_first_ch) ? p : NULL; 5070 } 5071 5072 5073 // Take pointer to a string. Skip over the longest part of the string that could 5074 // be taken as a field signature. Allow "void" if void_ok. 5075 // Return a pointer to just past the signature. 5076 // Return NULL if no legal signature is found. 5077 char* ClassFileParser::skip_over_field_signature(char* signature, 5078 bool void_ok, 5079 unsigned int length, 5080 TRAPS) { 5081 unsigned int array_dim = 0; 5082 while (length > 0) { 5083 switch (signature[0]) { 5084 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; } 5085 case JVM_SIGNATURE_BOOLEAN: 5086 case JVM_SIGNATURE_BYTE: 5087 case JVM_SIGNATURE_CHAR: 5088 case JVM_SIGNATURE_SHORT: 5089 case JVM_SIGNATURE_INT: 5090 case JVM_SIGNATURE_FLOAT: 5091 case JVM_SIGNATURE_LONG: 5092 case JVM_SIGNATURE_DOUBLE: 5093 return signature + 1; 5094 case JVM_SIGNATURE_CLASS: { 5095 if (_major_version < JAVA_1_5_VERSION) { 5096 // Skip over the class name if one is there 5097 char* p = skip_over_field_name(signature + 1, true, --length); 5098 5099 // The next character better be a semicolon 5100 if (p && (p - signature) > 1 && p[0] == ';') { 5101 return p + 1; 5102 } 5103 } else { 5104 // 4900761: For class version > 48, any unicode is allowed in class name. 5105 length--; 5106 signature++; 5107 while (length > 0 && signature[0] != ';') { 5108 if (signature[0] == '.') { 5109 classfile_parse_error("Class name contains illegal character '.' in descriptor in class file %s", CHECK_0); 5110 } 5111 length--; 5112 signature++; 5113 } 5114 if (signature[0] == ';') { return signature + 1; } 5115 } 5116 5117 return NULL; 5118 } 5119 case JVM_SIGNATURE_ARRAY: 5120 array_dim++; 5121 if (array_dim > 255) { 5122 // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. 5123 classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", CHECK_0); 5124 } 5125 // The rest of what's there better be a legal signature 5126 signature++; 5127 length--; 5128 void_ok = false; 5129 break; 5130 5131 default: 5132 return NULL; 5133 } 5134 } 5135 return NULL; 5136 }