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